// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/*
 * hcd.c - DesignWare HS OTG Controller host-mode routines
 *
 * Copyright (C) 2004-2013 Synopsys, Inc.
 */

/*
 * This file contains the core HCD code, and implements the Linux hc_driver
 * API
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/usb.h>

#include <linux/usb/hcd.h>
#include <linux/usb/ch11.h>
#include <linux/usb/of.h>

#include "core.h"
#include "hcd.h"

/*
 * =========================================================================
 *  Host Core Layer Functions
 * =========================================================================
 */

/**
 * dwc2_enable_common_interrupts() - Initializes the commmon interrupts,
 * used in both device and host modes
 *
 * @hsotg: Programming view of the DWC_otg controller
 */
static void dwc2_enable_common_interrupts(struct dwc2_hsotg *hsotg)
{
        u32 intmsk;

        /* Clear any pending OTG Interrupts */
        dwc2_writel(hsotg, 0xffffffff, GOTGINT);

        /* Clear any pending interrupts */
        dwc2_writel(hsotg, 0xffffffff, GINTSTS);

        /* Enable the interrupts in the GINTMSK */
        intmsk = GINTSTS_MODEMIS | GINTSTS_OTGINT;

        if (!hsotg->params.host_dma)
                intmsk |= GINTSTS_RXFLVL;
        if (!hsotg->params.external_id_pin_ctl)
                intmsk |= GINTSTS_CONIDSTSCHNG;

        intmsk |= GINTSTS_WKUPINT | GINTSTS_USBSUSP |
                  GINTSTS_SESSREQINT;

        if (dwc2_is_device_mode(hsotg) && hsotg->params.lpm)
                intmsk |= GINTSTS_LPMTRANRCVD;

        dwc2_writel(hsotg, intmsk, GINTMSK);
}

static int dwc2_gahbcfg_init(struct dwc2_hsotg *hsotg)
{
        u32 ahbcfg = dwc2_readl(hsotg, GAHBCFG);

        switch (hsotg->hw_params.arch) {
        case GHWCFG2_EXT_DMA_ARCH:
                dev_err(hsotg->dev, "External DMA Mode not supported\n");
                return -EINVAL;

        case GHWCFG2_INT_DMA_ARCH:
                dev_dbg(hsotg->dev, "Internal DMA Mode\n");
                if (hsotg->params.ahbcfg != -1) {
                        ahbcfg &= GAHBCFG_CTRL_MASK;
                        ahbcfg |= hsotg->params.ahbcfg &
                                  ~GAHBCFG_CTRL_MASK;
                }
                break;

        case GHWCFG2_SLAVE_ONLY_ARCH:
        default:
                dev_dbg(hsotg->dev, "Slave Only Mode\n");
                break;
        }

        if (hsotg->params.host_dma)
                ahbcfg |= GAHBCFG_DMA_EN;
        else
                hsotg->params.dma_desc_enable = false;

        dwc2_writel(hsotg, ahbcfg, GAHBCFG);

        return 0;
}

static void dwc2_gusbcfg_init(struct dwc2_hsotg *hsotg)
{
        u32 usbcfg;

        usbcfg = dwc2_readl(hsotg, GUSBCFG);
        usbcfg &= ~(GUSBCFG_HNPCAP | GUSBCFG_SRPCAP);

        switch (hsotg->hw_params.op_mode) {
        case GHWCFG2_OP_MODE_HNP_SRP_CAPABLE:
                if (hsotg->params.otg_caps.hnp_support &&
                    hsotg->params.otg_caps.srp_support)
                        usbcfg |= GUSBCFG_HNPCAP;
                fallthrough;

        case GHWCFG2_OP_MODE_SRP_ONLY_CAPABLE:
        case GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE:
        case GHWCFG2_OP_MODE_SRP_CAPABLE_HOST:
                if (hsotg->params.otg_caps.srp_support)
                        usbcfg |= GUSBCFG_SRPCAP;
                break;

        case GHWCFG2_OP_MODE_NO_HNP_SRP_CAPABLE:
        case GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE:
        case GHWCFG2_OP_MODE_NO_SRP_CAPABLE_HOST:
        default:
                break;
        }

        dwc2_writel(hsotg, usbcfg, GUSBCFG);
}

static int dwc2_vbus_supply_init(struct dwc2_hsotg *hsotg)
{
        if (hsotg->vbus_supply)
                return regulator_enable(hsotg->vbus_supply);

        return 0;
}

static int dwc2_vbus_supply_exit(struct dwc2_hsotg *hsotg)
{
        if (hsotg->vbus_supply)
                return regulator_disable(hsotg->vbus_supply);

        return 0;
}

/**
 * dwc2_enable_host_interrupts() - Enables the Host mode interrupts
 *
 * @hsotg: Programming view of DWC_otg controller
 */
static void dwc2_enable_host_interrupts(struct dwc2_hsotg *hsotg)
{
        u32 intmsk;

        dev_dbg(hsotg->dev, "%s()\n", __func__);

        /* Disable all interrupts */
        dwc2_writel(hsotg, 0, GINTMSK);
        dwc2_writel(hsotg, 0, HAINTMSK);

        /* Enable the common interrupts */
        dwc2_enable_common_interrupts(hsotg);

        /* Enable host mode interrupts without disturbing common interrupts */
        intmsk = dwc2_readl(hsotg, GINTMSK);
        intmsk |= GINTSTS_DISCONNINT | GINTSTS_PRTINT | GINTSTS_HCHINT;
        dwc2_writel(hsotg, intmsk, GINTMSK);
}

/**
 * dwc2_disable_host_interrupts() - Disables the Host Mode interrupts
 *
 * @hsotg: Programming view of DWC_otg controller
 */
static void dwc2_disable_host_interrupts(struct dwc2_hsotg *hsotg)
{
        u32 intmsk = dwc2_readl(hsotg, GINTMSK);

        /* Disable host mode interrupts without disturbing common interrupts */
        intmsk &= ~(GINTSTS_SOF | GINTSTS_PRTINT | GINTSTS_HCHINT |
                    GINTSTS_PTXFEMP | GINTSTS_NPTXFEMP | GINTSTS_DISCONNINT);
        dwc2_writel(hsotg, intmsk, GINTMSK);
}

/*
 * dwc2_calculate_dynamic_fifo() - Calculates the default fifo size
 * For system that have a total fifo depth that is smaller than the default
 * RX + TX fifo size.
 *
 * @hsotg: Programming view of DWC_otg controller
 */
static void dwc2_calculate_dynamic_fifo(struct dwc2_hsotg *hsotg)
{
        struct dwc2_core_params *params = &hsotg->params;
        struct dwc2_hw_params *hw = &hsotg->hw_params;
        u32 rxfsiz, nptxfsiz, ptxfsiz, total_fifo_size;

        total_fifo_size = hw->total_fifo_size;
        rxfsiz = params->host_rx_fifo_size;
        nptxfsiz = params->host_nperio_tx_fifo_size;
        ptxfsiz = params->host_perio_tx_fifo_size;

        /*
         * Will use Method 2 defined in the DWC2 spec: minimum FIFO depth
         * allocation with support for high bandwidth endpoints. Synopsys
         * defines MPS(Max Packet size) for a periodic EP=1024, and for
         * non-periodic as 512.
         */
        if (total_fifo_size < (rxfsiz + nptxfsiz + ptxfsiz)) {
                /*
                 * For Buffer DMA mode/Scatter Gather DMA mode
                 * 2 * ((Largest Packet size / 4) + 1 + 1) + n
                 * with n = number of host channel.
                 * 2 * ((1024/4) + 2) = 516
                 */
                rxfsiz = 516 + hw->host_channels;

                /*
                 * min non-periodic tx fifo depth
                 * 2 * (largest non-periodic USB packet used / 4)
                 * 2 * (512/4) = 256
                 */
                nptxfsiz = 256;

                /*
                 * min periodic tx fifo depth
                 * (largest packet size*MC)/4
                 * (1024 * 3)/4 = 768
                 */
                ptxfsiz = 768;

                params->host_rx_fifo_size = rxfsiz;
                params->host_nperio_tx_fifo_size = nptxfsiz;
                params->host_perio_tx_fifo_size = ptxfsiz;
        }

        /*
         * If the summation of RX, NPTX and PTX fifo sizes is still
         * bigger than the total_fifo_size, then we have a problem.
         *
         * We won't be able to allocate as many endpoints. Right now,
         * we're just printing an error message, but ideally this FIFO
         * allocation algorithm would be improved in the future.
         *
         * FIXME improve this FIFO allocation algorithm.
         */
        if (unlikely(total_fifo_size < (rxfsiz + nptxfsiz + ptxfsiz)))
                dev_err(hsotg->dev, "invalid fifo sizes\n");
}

static void dwc2_config_fifos(struct dwc2_hsotg *hsotg)
{
        struct dwc2_core_params *params = &hsotg->params;
        u32 nptxfsiz, hptxfsiz, dfifocfg, grxfsiz;

        if (!params->enable_dynamic_fifo)
                return;

        dwc2_calculate_dynamic_fifo(hsotg);

        /* Rx FIFO */
        grxfsiz = dwc2_readl(hsotg, GRXFSIZ);
        dev_dbg(hsotg->dev, "initial grxfsiz=%08x\n", grxfsiz);
        grxfsiz &= ~GRXFSIZ_DEPTH_MASK;
        grxfsiz |= params->host_rx_fifo_size <<
                   GRXFSIZ_DEPTH_SHIFT & GRXFSIZ_DEPTH_MASK;
        dwc2_writel(hsotg, grxfsiz, GRXFSIZ);
        dev_dbg(hsotg->dev, "new grxfsiz=%08x\n",
                dwc2_readl(hsotg, GRXFSIZ));

        /* Non-periodic Tx FIFO */
        dev_dbg(hsotg->dev, "initial gnptxfsiz=%08x\n",
                dwc2_readl(hsotg, GNPTXFSIZ));
        nptxfsiz = params->host_nperio_tx_fifo_size <<
                   FIFOSIZE_DEPTH_SHIFT & FIFOSIZE_DEPTH_MASK;
        nptxfsiz |= params->host_rx_fifo_size <<
                    FIFOSIZE_STARTADDR_SHIFT & FIFOSIZE_STARTADDR_MASK;
        dwc2_writel(hsotg, nptxfsiz, GNPTXFSIZ);
        dev_dbg(hsotg->dev, "new gnptxfsiz=%08x\n",
                dwc2_readl(hsotg, GNPTXFSIZ));

        /* Periodic Tx FIFO */
        dev_dbg(hsotg->dev, "initial hptxfsiz=%08x\n",
                dwc2_readl(hsotg, HPTXFSIZ));
        hptxfsiz = params->host_perio_tx_fifo_size <<
                   FIFOSIZE_DEPTH_SHIFT & FIFOSIZE_DEPTH_MASK;
        hptxfsiz |= (params->host_rx_fifo_size +
                     params->host_nperio_tx_fifo_size) <<
                    FIFOSIZE_STARTADDR_SHIFT & FIFOSIZE_STARTADDR_MASK;
        dwc2_writel(hsotg, hptxfsiz, HPTXFSIZ);
        dev_dbg(hsotg->dev, "new hptxfsiz=%08x\n",
                dwc2_readl(hsotg, HPTXFSIZ));

        if (hsotg->params.en_multiple_tx_fifo &&
            hsotg->hw_params.snpsid >= DWC2_CORE_REV_2_91a) {
                /*
                 * This feature was implemented in 2.91a version
                 * Global DFIFOCFG calculation for Host mode -
                 * include RxFIFO, NPTXFIFO and HPTXFIFO
                 */
                dfifocfg = dwc2_readl(hsotg, GDFIFOCFG);
                dfifocfg &= ~GDFIFOCFG_EPINFOBASE_MASK;
                dfifocfg |= (params->host_rx_fifo_size +
                             params->host_nperio_tx_fifo_size +
                             params->host_perio_tx_fifo_size) <<
                            GDFIFOCFG_EPINFOBASE_SHIFT &
                            GDFIFOCFG_EPINFOBASE_MASK;
                dwc2_writel(hsotg, dfifocfg, GDFIFOCFG);
        }
}

/**
 * dwc2_calc_frame_interval() - Calculates the correct frame Interval value for
 * the HFIR register according to PHY type and speed
 *
 * @hsotg: Programming view of DWC_otg controller
 *
 * NOTE: The caller can modify the value of the HFIR register only after the
 * Port Enable bit of the Host Port Control and Status register (HPRT.EnaPort)
 * has been set
 */
u32 dwc2_calc_frame_interval(struct dwc2_hsotg *hsotg)
{
        u32 usbcfg;
        u32 hprt0;
        int clock = 60; /* default value */

        usbcfg = dwc2_readl(hsotg, GUSBCFG);
        hprt0 = dwc2_readl(hsotg, HPRT0);

        if (!(usbcfg & GUSBCFG_PHYSEL) && (usbcfg & GUSBCFG_ULPI_UTMI_SEL) &&
            !(usbcfg & GUSBCFG_PHYIF16))
                clock = 60;
        if ((usbcfg & GUSBCFG_PHYSEL) && hsotg->hw_params.fs_phy_type ==
            GHWCFG2_FS_PHY_TYPE_SHARED_ULPI)
                clock = 48;
        if (!(usbcfg & GUSBCFG_PHY_LP_CLK_SEL) && !(usbcfg & GUSBCFG_PHYSEL) &&
            !(usbcfg & GUSBCFG_ULPI_UTMI_SEL) && (usbcfg & GUSBCFG_PHYIF16))
                clock = 30;
        if (!(usbcfg & GUSBCFG_PHY_LP_CLK_SEL) && !(usbcfg & GUSBCFG_PHYSEL) &&
            !(usbcfg & GUSBCFG_ULPI_UTMI_SEL) && !(usbcfg & GUSBCFG_PHYIF16))
                clock = 60;
        if ((usbcfg & GUSBCFG_PHY_LP_CLK_SEL) && !(usbcfg & GUSBCFG_PHYSEL) &&
            !(usbcfg & GUSBCFG_ULPI_UTMI_SEL) && (usbcfg & GUSBCFG_PHYIF16))
                clock = 48;
        if ((usbcfg & GUSBCFG_PHYSEL) && !(usbcfg & GUSBCFG_PHYIF16) &&
            hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_SHARED_UTMI)
                clock = 48;
        if ((usbcfg & GUSBCFG_PHYSEL) &&
            hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED)
                clock = 48;

        if ((hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT == HPRT0_SPD_HIGH_SPEED)
                /* High speed case */
                return 125 * clock - 1;

        /* FS/LS case */
        return 1000 * clock - 1;
}

/**
 * dwc2_read_packet() - Reads a packet from the Rx FIFO into the destination
 * buffer
 *
 * @hsotg: Programming view of DWC_otg controller
 * @dest:    Destination buffer for the packet
 * @bytes:   Number of bytes to copy to the destination
 */
void dwc2_read_packet(struct dwc2_hsotg *hsotg, u8 *dest, u16 bytes)
{
        u32 *data_buf = (u32 *)dest;
        int word_count = (bytes + 3) / 4;
        int i;

        /*
         * Todo: Account for the case where dest is not dword aligned. This
         * requires reading data from the FIFO into a u32 temp buffer, then
         * moving it into the data buffer.
         */

        dev_vdbg(hsotg->dev, "%s(%p,%p,%d)\n", __func__, hsotg, dest, bytes);

        for (i = 0; i < word_count; i++, data_buf++)
                *data_buf = dwc2_readl(hsotg, HCFIFO(0));
}

/**
 * dwc2_dump_channel_info() - Prints the state of a host channel
 *
 * @hsotg: Programming view of DWC_otg controller
 * @chan:  Pointer to the channel to dump
 *
 * Must be called with interrupt disabled and spinlock held
 *
 * NOTE: This function will be removed once the peripheral controller code
 * is integrated and the driver is stable
 */
static void dwc2_dump_channel_info(struct dwc2_hsotg *hsotg,
                                   struct dwc2_host_chan *chan)
{
#ifdef VERBOSE_DEBUG
        int num_channels = hsotg->params.host_channels;
        struct dwc2_qh *qh;
        u32 hcchar;
        u32 hcsplt;
        u32 hctsiz;
        u32 hc_dma;
        int i;

        if (!chan)
                return;

        hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num));
        hcsplt = dwc2_readl(hsotg, HCSPLT(chan->hc_num));
        hctsiz = dwc2_readl(hsotg, HCTSIZ(chan->hc_num));
        hc_dma = dwc2_readl(hsotg, HCDMA(chan->hc_num));

        dev_dbg(hsotg->dev, "  Assigned to channel %p:\n", chan);
        dev_dbg(hsotg->dev, "    hcchar 0x%08x, hcsplt 0x%08x\n",
                hcchar, hcsplt);
        dev_dbg(hsotg->dev, "    hctsiz 0x%08x, hc_dma 0x%08x\n",
                hctsiz, hc_dma);
        dev_dbg(hsotg->dev, "    dev_addr: %d, ep_num: %d, ep_is_in: %d\n",
                chan->dev_addr, chan->ep_num, chan->ep_is_in);
        dev_dbg(hsotg->dev, "    ep_type: %d\n", chan->ep_type);
        dev_dbg(hsotg->dev, "    max_packet: %d\n", chan->max_packet);
        dev_dbg(hsotg->dev, "    data_pid_start: %d\n", chan->data_pid_start);
        dev_dbg(hsotg->dev, "    xfer_started: %d\n", chan->xfer_started);
        dev_dbg(hsotg->dev, "    halt_status: %d\n", chan->halt_status);
        dev_dbg(hsotg->dev, "    xfer_buf: %p\n", chan->xfer_buf);
        dev_dbg(hsotg->dev, "    xfer_dma: %08lx\n",
                (unsigned long)chan->xfer_dma);
        dev_dbg(hsotg->dev, "    xfer_len: %d\n", chan->xfer_len);
        dev_dbg(hsotg->dev, "    qh: %p\n", chan->qh);
        dev_dbg(hsotg->dev, "  NP inactive sched:\n");
        list_for_each_entry(qh, &hsotg->non_periodic_sched_inactive,
                            qh_list_entry)
                dev_dbg(hsotg->dev, "    %p\n", qh);
        dev_dbg(hsotg->dev, "  NP waiting sched:\n");
        list_for_each_entry(qh, &hsotg->non_periodic_sched_waiting,
                            qh_list_entry)
                dev_dbg(hsotg->dev, "    %p\n", qh);
        dev_dbg(hsotg->dev, "  NP active sched:\n");
        list_for_each_entry(qh, &hsotg->non_periodic_sched_active,
                            qh_list_entry)
                dev_dbg(hsotg->dev, "    %p\n", qh);
        dev_dbg(hsotg->dev, "  Channels:\n");
        for (i = 0; i < num_channels; i++) {
                struct dwc2_host_chan *chan = hsotg->hc_ptr_array[i];

                dev_dbg(hsotg->dev, "    %2d: %p\n", i, chan);
        }
#endif /* VERBOSE_DEBUG */
}

static int _dwc2_hcd_start(struct usb_hcd *hcd);

static void dwc2_host_start(struct dwc2_hsotg *hsotg)
{
        struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg);

        hcd->self.is_b_host = dwc2_hcd_is_b_host(hsotg);
        _dwc2_hcd_start(hcd);
}

static void dwc2_host_disconnect(struct dwc2_hsotg *hsotg)
{
        struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg);

        hcd->self.is_b_host = 0;
}

static void dwc2_host_hub_info(struct dwc2_hsotg *hsotg, void *context,
                               int *hub_addr, int *hub_port)
{
        struct urb *urb = context;

        if (urb->dev->tt)
                *hub_addr = urb->dev->tt->hub->devnum;
        else
                *hub_addr = 0;
        *hub_port = urb->dev->ttport;
}

/*
 * =========================================================================
 *  Low Level Host Channel Access Functions
 * =========================================================================
 */

static void dwc2_hc_enable_slave_ints(struct dwc2_hsotg *hsotg,
                                      struct dwc2_host_chan *chan)
{
        u32 hcintmsk = HCINTMSK_CHHLTD;

        switch (chan->ep_type) {
        case USB_ENDPOINT_XFER_CONTROL:
        case USB_ENDPOINT_XFER_BULK:
                dev_vdbg(hsotg->dev, "control/bulk\n");
                hcintmsk |= HCINTMSK_XFERCOMPL;
                hcintmsk |= HCINTMSK_STALL;
                hcintmsk |= HCINTMSK_XACTERR;
                hcintmsk |= HCINTMSK_DATATGLERR;
                if (chan->ep_is_in) {
                        hcintmsk |= HCINTMSK_BBLERR;
                } else {
                        hcintmsk |= HCINTMSK_NAK;
                        hcintmsk |= HCINTMSK_NYET;
                        if (chan->do_ping)
                                hcintmsk |= HCINTMSK_ACK;
                }

                if (chan->do_split) {
                        hcintmsk |= HCINTMSK_NAK;
                        if (chan->complete_split)
                                hcintmsk |= HCINTMSK_NYET;
                        else
                                hcintmsk |= HCINTMSK_ACK;
                }

                if (chan->error_state)
                        hcintmsk |= HCINTMSK_ACK;
                break;

        case USB_ENDPOINT_XFER_INT:
                if (dbg_perio())
                        dev_vdbg(hsotg->dev, "intr\n");
                hcintmsk |= HCINTMSK_XFERCOMPL;
                hcintmsk |= HCINTMSK_NAK;
                hcintmsk |= HCINTMSK_STALL;
                hcintmsk |= HCINTMSK_XACTERR;
                hcintmsk |= HCINTMSK_DATATGLERR;
                hcintmsk |= HCINTMSK_FRMOVRUN;

                if (chan->ep_is_in)
                        hcintmsk |= HCINTMSK_BBLERR;
                if (chan->error_state)
                        hcintmsk |= HCINTMSK_ACK;
                if (chan->do_split) {
                        if (chan->complete_split)
                                hcintmsk |= HCINTMSK_NYET;
                        else
                                hcintmsk |= HCINTMSK_ACK;
                }
                break;

        case USB_ENDPOINT_XFER_ISOC:
                if (dbg_perio())
                        dev_vdbg(hsotg->dev, "isoc\n");
                hcintmsk |= HCINTMSK_XFERCOMPL;
                hcintmsk |= HCINTMSK_FRMOVRUN;
                hcintmsk |= HCINTMSK_ACK;

                if (chan->ep_is_in) {
                        hcintmsk |= HCINTMSK_XACTERR;
                        hcintmsk |= HCINTMSK_BBLERR;
                }
                break;
        default:
                dev_err(hsotg->dev, "## Unknown EP type ##\n");
                break;
        }

        dwc2_writel(hsotg, hcintmsk, HCINTMSK(chan->hc_num));
        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "set HCINTMSK to %08x\n", hcintmsk);
}

static void dwc2_hc_enable_dma_ints(struct dwc2_hsotg *hsotg,
                                    struct dwc2_host_chan *chan)
{
        u32 hcintmsk = HCINTMSK_CHHLTD;

        /*
         * For Descriptor DMA mode core halts the channel on AHB error.
         * Interrupt is not required.
         */
        if (!hsotg->params.dma_desc_enable) {
                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "desc DMA disabled\n");
                hcintmsk |= HCINTMSK_AHBERR;
        } else {
                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "desc DMA enabled\n");
                if (chan->ep_type == USB_ENDPOINT_XFER_ISOC)
                        hcintmsk |= HCINTMSK_XFERCOMPL;
        }

        if (chan->error_state && !chan->do_split &&
            chan->ep_type != USB_ENDPOINT_XFER_ISOC) {
                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "setting ACK\n");
                hcintmsk |= HCINTMSK_ACK;
                if (chan->ep_is_in) {
                        hcintmsk |= HCINTMSK_DATATGLERR;
                        if (chan->ep_type != USB_ENDPOINT_XFER_INT)
                                hcintmsk |= HCINTMSK_NAK;
                }
        }

        dwc2_writel(hsotg, hcintmsk, HCINTMSK(chan->hc_num));
        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "set HCINTMSK to %08x\n", hcintmsk);
}

static void dwc2_hc_enable_ints(struct dwc2_hsotg *hsotg,
                                struct dwc2_host_chan *chan)
{
        u32 intmsk;

        if (hsotg->params.host_dma) {
                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "DMA enabled\n");
                dwc2_hc_enable_dma_ints(hsotg, chan);
        } else {
                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "DMA disabled\n");
                dwc2_hc_enable_slave_ints(hsotg, chan);
        }

        /* Enable the top level host channel interrupt */
        intmsk = dwc2_readl(hsotg, HAINTMSK);
        intmsk |= 1 << chan->hc_num;
        dwc2_writel(hsotg, intmsk, HAINTMSK);
        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "set HAINTMSK to %08x\n", intmsk);

        /* Make sure host channel interrupts are enabled */
        intmsk = dwc2_readl(hsotg, GINTMSK);
        intmsk |= GINTSTS_HCHINT;
        dwc2_writel(hsotg, intmsk, GINTMSK);
        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "set GINTMSK to %08x\n", intmsk);
}

/**
 * dwc2_hc_init() - Prepares a host channel for transferring packets to/from
 * a specific endpoint
 *
 * @hsotg: Programming view of DWC_otg controller
 * @chan:  Information needed to initialize the host channel
 *
 * The HCCHARn register is set up with the characteristics specified in chan.
 * Host channel interrupts that may need to be serviced while this transfer is
 * in progress are enabled.
 */
static void dwc2_hc_init(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan)
{
        u8 hc_num = chan->hc_num;
        u32 hcintmsk;
        u32 hcchar;
        u32 hcsplt = 0;

        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "%s()\n", __func__);

        /* Clear old interrupt conditions for this host channel */
        hcintmsk = 0xffffffff;
        hcintmsk &= ~HCINTMSK_RESERVED14_31;
        dwc2_writel(hsotg, hcintmsk, HCINT(hc_num));

        /* Enable channel interrupts required for this transfer */
        dwc2_hc_enable_ints(hsotg, chan);

        /*
         * Program the HCCHARn register with the endpoint characteristics for
         * the current transfer
         */
        hcchar = chan->dev_addr << HCCHAR_DEVADDR_SHIFT & HCCHAR_DEVADDR_MASK;
        hcchar |= chan->ep_num << HCCHAR_EPNUM_SHIFT & HCCHAR_EPNUM_MASK;
        if (chan->ep_is_in)
                hcchar |= HCCHAR_EPDIR;
        if (chan->speed == USB_SPEED_LOW)
                hcchar |= HCCHAR_LSPDDEV;
        hcchar |= chan->ep_type << HCCHAR_EPTYPE_SHIFT & HCCHAR_EPTYPE_MASK;
        hcchar |= chan->max_packet << HCCHAR_MPS_SHIFT & HCCHAR_MPS_MASK;
        dwc2_writel(hsotg, hcchar, HCCHAR(hc_num));
        if (dbg_hc(chan)) {
                dev_vdbg(hsotg->dev, "set HCCHAR(%d) to %08x\n",
                         hc_num, hcchar);

                dev_vdbg(hsotg->dev, "%s: Channel %d\n",
                         __func__, hc_num);
                dev_vdbg(hsotg->dev, "   Dev Addr: %d\n",
                         chan->dev_addr);
                dev_vdbg(hsotg->dev, "   Ep Num: %d\n",
                         chan->ep_num);
                dev_vdbg(hsotg->dev, "   Is In: %d\n",
                         chan->ep_is_in);
                dev_vdbg(hsotg->dev, "   Is Low Speed: %d\n",
                         chan->speed == USB_SPEED_LOW);
                dev_vdbg(hsotg->dev, "   Ep Type: %d\n",
                         chan->ep_type);
                dev_vdbg(hsotg->dev, "   Max Pkt: %d\n",
                         chan->max_packet);
        }

        /* Program the HCSPLT register for SPLITs */
        if (chan->do_split) {
                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev,
                                 "Programming HC %d with split --> %s\n",
                                 hc_num,
                                 chan->complete_split ? "CSPLIT" : "SSPLIT");
                if (chan->complete_split)
                        hcsplt |= HCSPLT_COMPSPLT;
                hcsplt |= chan->xact_pos << HCSPLT_XACTPOS_SHIFT &
                          HCSPLT_XACTPOS_MASK;
                hcsplt |= chan->hub_addr << HCSPLT_HUBADDR_SHIFT &
                          HCSPLT_HUBADDR_MASK;
                hcsplt |= chan->hub_port << HCSPLT_PRTADDR_SHIFT &
                          HCSPLT_PRTADDR_MASK;
                if (dbg_hc(chan)) {
                        dev_vdbg(hsotg->dev, "    comp split %d\n",
                                 chan->complete_split);
                        dev_vdbg(hsotg->dev, "    xact pos %d\n",
                                 chan->xact_pos);
                        dev_vdbg(hsotg->dev, "    hub addr %d\n",
                                 chan->hub_addr);
                        dev_vdbg(hsotg->dev, "    hub port %d\n",
                                 chan->hub_port);
                        dev_vdbg(hsotg->dev, "    is_in %d\n",
                                 chan->ep_is_in);
                        dev_vdbg(hsotg->dev, "    Max Pkt %d\n",
                                 chan->max_packet);
                        dev_vdbg(hsotg->dev, "    xferlen %d\n",
                                 chan->xfer_len);
                }
        }

        dwc2_writel(hsotg, hcsplt, HCSPLT(hc_num));
}

/**
 * dwc2_hc_halt() - Attempts to halt a host channel
 *
 * @hsotg:       Controller register interface
 * @chan:        Host channel to halt
 * @halt_status: Reason for halting the channel
 *
 * This function should only be called in Slave mode or to abort a transfer in
 * either Slave mode or DMA mode. Under normal circumstances in DMA mode, the
 * controller halts the channel when the transfer is complete or a condition
 * occurs that requires application intervention.
 *
 * In slave mode, checks for a free request queue entry, then sets the Channel
 * Enable and Channel Disable bits of the Host Channel Characteristics
 * register of the specified channel to intiate the halt. If there is no free
 * request queue entry, sets only the Channel Disable bit of the HCCHARn
 * register to flush requests for this channel. In the latter case, sets a
 * flag to indicate that the host channel needs to be halted when a request
 * queue slot is open.
 *
 * In DMA mode, always sets the Channel Enable and Channel Disable bits of the
 * HCCHARn register. The controller ensures there is space in the request
 * queue before submitting the halt request.
 *
 * Some time may elapse before the core flushes any posted requests for this
 * host channel and halts. The Channel Halted interrupt handler completes the
 * deactivation of the host channel.
 */
void dwc2_hc_halt(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan,
                  enum dwc2_halt_status halt_status)
{
        u32 nptxsts, hptxsts, hcchar;

        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "%s()\n", __func__);

        /*
         * In buffer DMA or external DMA mode channel can't be halted
         * for non-split periodic channels. At the end of the next
         * uframe/frame (in the worst case), the core generates a channel
         * halted and disables the channel automatically.
         */
        if ((hsotg->params.g_dma && !hsotg->params.g_dma_desc) ||
            hsotg->hw_params.arch == GHWCFG2_EXT_DMA_ARCH) {
                if (!chan->do_split &&
                    (chan->ep_type == USB_ENDPOINT_XFER_ISOC ||
                     chan->ep_type == USB_ENDPOINT_XFER_INT)) {
                        dev_err(hsotg->dev, "%s() Channel can't be halted\n",
                                __func__);
                        return;
                }
        }

        if (halt_status == DWC2_HC_XFER_NO_HALT_STATUS)
                dev_err(hsotg->dev, "!!! halt_status = %d !!!\n", halt_status);

        if (halt_status == DWC2_HC_XFER_URB_DEQUEUE ||
            halt_status == DWC2_HC_XFER_AHB_ERR) {
                /*
                 * Disable all channel interrupts except Ch Halted. The QTD
                 * and QH state associated with this transfer has been cleared
                 * (in the case of URB_DEQUEUE), so the channel needs to be
                 * shut down carefully to prevent crashes.
                 */
                u32 hcintmsk = HCINTMSK_CHHLTD;

                dev_vdbg(hsotg->dev, "dequeue/error\n");
                dwc2_writel(hsotg, hcintmsk, HCINTMSK(chan->hc_num));

                /*
                 * Make sure no other interrupts besides halt are currently
                 * pending. Handling another interrupt could cause a crash due
                 * to the QTD and QH state.
                 */
                dwc2_writel(hsotg, ~hcintmsk, HCINT(chan->hc_num));

                /*
                 * Make sure the halt status is set to URB_DEQUEUE or AHB_ERR
                 * even if the channel was already halted for some other
                 * reason
                 */
                chan->halt_status = halt_status;

                hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num));
                if (!(hcchar & HCCHAR_CHENA)) {
                        /*
                         * The channel is either already halted or it hasn't
                         * started yet. In DMA mode, the transfer may halt if
                         * it finishes normally or a condition occurs that
                         * requires driver intervention. Don't want to halt
                         * the channel again. In either Slave or DMA mode,
                         * it's possible that the transfer has been assigned
                         * to a channel, but not started yet when an URB is
                         * dequeued. Don't want to halt a channel that hasn't
                         * started yet.
                         */
                        return;
                }
        }
        if (chan->halt_pending) {
                /*
                 * A halt has already been issued for this channel. This might
                 * happen when a transfer is aborted by a higher level in
                 * the stack.
                 */
                dev_vdbg(hsotg->dev,
                         "*** %s: Channel %d, chan->halt_pending already set ***\n",
                         __func__, chan->hc_num);
                return;
        }

        hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num));

        /* No need to set the bit in DDMA for disabling the channel */
        /* TODO check it everywhere channel is disabled */
        if (!hsotg->params.dma_desc_enable) {
                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "desc DMA disabled\n");
                hcchar |= HCCHAR_CHENA;
        } else {
                if (dbg_hc(chan))
                        dev_dbg(hsotg->dev, "desc DMA enabled\n");
        }
        hcchar |= HCCHAR_CHDIS;

        if (!hsotg->params.host_dma) {
                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "DMA not enabled\n");
                hcchar |= HCCHAR_CHENA;

                /* Check for space in the request queue to issue the halt */
                if (chan->ep_type == USB_ENDPOINT_XFER_CONTROL ||
                    chan->ep_type == USB_ENDPOINT_XFER_BULK) {
                        dev_vdbg(hsotg->dev, "control/bulk\n");
                        nptxsts = dwc2_readl(hsotg, GNPTXSTS);
                        if ((nptxsts & TXSTS_QSPCAVAIL_MASK) == 0) {
                                dev_vdbg(hsotg->dev, "Disabling channel\n");
                                hcchar &= ~HCCHAR_CHENA;
                        }
                } else {
                        if (dbg_perio())
                                dev_vdbg(hsotg->dev, "isoc/intr\n");
                        hptxsts = dwc2_readl(hsotg, HPTXSTS);
                        if ((hptxsts & TXSTS_QSPCAVAIL_MASK) == 0 ||
                            hsotg->queuing_high_bandwidth) {
                                if (dbg_perio())
                                        dev_vdbg(hsotg->dev, "Disabling channel\n");
                                hcchar &= ~HCCHAR_CHENA;
                        }
                }
        } else {
                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "DMA enabled\n");
        }

        dwc2_writel(hsotg, hcchar, HCCHAR(chan->hc_num));
        chan->halt_status = halt_status;

        if (hcchar & HCCHAR_CHENA) {
                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "Channel enabled\n");
                chan->halt_pending = 1;
                chan->halt_on_queue = 0;
        } else {
                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "Channel disabled\n");
                chan->halt_on_queue = 1;
        }

        if (dbg_hc(chan)) {
                dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
                         chan->hc_num);
                dev_vdbg(hsotg->dev, "   hcchar: 0x%08x\n",
                         hcchar);
                dev_vdbg(hsotg->dev, "   halt_pending: %d\n",
                         chan->halt_pending);
                dev_vdbg(hsotg->dev, "   halt_on_queue: %d\n",
                         chan->halt_on_queue);
                dev_vdbg(hsotg->dev, "   halt_status: %d\n",
                         chan->halt_status);
        }
}

/**
 * dwc2_hc_cleanup() - Clears the transfer state for a host channel
 *
 * @hsotg: Programming view of DWC_otg controller
 * @chan:  Identifies the host channel to clean up
 *
 * This function is normally called after a transfer is done and the host
 * channel is being released
 */
void dwc2_hc_cleanup(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan)
{
        u32 hcintmsk;

        chan->xfer_started = 0;

        list_del_init(&chan->split_order_list_entry);

        /*
         * Clear channel interrupt enables and any unhandled channel interrupt
         * conditions
         */
        dwc2_writel(hsotg, 0, HCINTMSK(chan->hc_num));
        hcintmsk = 0xffffffff;
        hcintmsk &= ~HCINTMSK_RESERVED14_31;
        dwc2_writel(hsotg, hcintmsk, HCINT(chan->hc_num));
}

/**
 * dwc2_hc_set_even_odd_frame() - Sets the channel property that indicates in
 * which frame a periodic transfer should occur
 *
 * @hsotg:  Programming view of DWC_otg controller
 * @chan:   Identifies the host channel to set up and its properties
 * @hcchar: Current value of the HCCHAR register for the specified host channel
 *
 * This function has no effect on non-periodic transfers
 */
static void dwc2_hc_set_even_odd_frame(struct dwc2_hsotg *hsotg,
                                       struct dwc2_host_chan *chan, u32 *hcchar)
{
        if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
            chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
                int host_speed;
                int xfer_ns;
                int xfer_us;
                int bytes_in_fifo;
                u16 fifo_space;
                u16 frame_number;
                u16 wire_frame;

                /*
                 * Try to figure out if we're an even or odd frame. If we set
                 * even and the current frame number is even the transfer
                 * will happen immediately.  Similar if both are odd. If one is
                 * even and the other is odd then the transfer will happen when
                 * the frame number ticks.
                 *
                 * There's a bit of a balancing act to get this right.
                 * Sometimes we may want to send data in the current frame (AK
                 * right away).  We might want to do this if the frame number
                 * _just_ ticked, but we might also want to do this in order
                 * to continue a split transaction that happened late in a
                 * microframe (so we didn't know to queue the next transfer
                 * until the frame number had ticked).  The problem is that we
                 * need a lot of knowledge to know if there's actually still
                 * time to send things or if it would be better to wait until
                 * the next frame.
                 *
                 * We can look at how much time is left in the current frame
                 * and make a guess about whether we'll have time to transfer.
                 * We'll do that.
                 */

                /* Get speed host is running at */
                host_speed = (chan->speed != USB_SPEED_HIGH &&
                              !chan->do_split) ? chan->speed : USB_SPEED_HIGH;

                /* See how many bytes are in the periodic FIFO right now */
                fifo_space = (dwc2_readl(hsotg, HPTXSTS) &
                              TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT;
                bytes_in_fifo = sizeof(u32) *
                                (hsotg->params.host_perio_tx_fifo_size -
                                 fifo_space);

                /*
                 * Roughly estimate bus time for everything in the periodic
                 * queue + our new transfer.  This is "rough" because we're
                 * using a function that makes takes into account IN/OUT
                 * and INT/ISO and we're just slamming in one value for all
                 * transfers.  This should be an over-estimate and that should
                 * be OK, but we can probably tighten it.
                 */
                xfer_ns = usb_calc_bus_time(host_speed, false, false,
                                            chan->xfer_len + bytes_in_fifo);
                xfer_us = NS_TO_US(xfer_ns);

                /* See what frame number we'll be at by the time we finish */
                frame_number = dwc2_hcd_get_future_frame_number(hsotg, xfer_us);

                /* This is when we were scheduled to be on the wire */
                wire_frame = dwc2_frame_num_inc(chan->qh->next_active_frame, 1);

                /*
                 * If we'd finish _after_ the frame we're scheduled in then
                 * it's hopeless.  Just schedule right away and hope for the
                 * best.  Note that it _might_ be wise to call back into the
                 * scheduler to pick a better frame, but this is better than
                 * nothing.
                 */
                if (dwc2_frame_num_gt(frame_number, wire_frame)) {
                        dwc2_sch_vdbg(hsotg,
                                      "QH=%p EO MISS fr=%04x=>%04x (%+d)\n",
                                      chan->qh, wire_frame, frame_number,
                                      dwc2_frame_num_dec(frame_number,
                                                         wire_frame));
                        wire_frame = frame_number;

                        /*
                         * We picked a different frame number; communicate this
                         * back to the scheduler so it doesn't try to schedule
                         * another in the same frame.
                         *
                         * Remember that next_active_frame is 1 before the wire
                         * frame.
                         */
                        chan->qh->next_active_frame =
                                dwc2_frame_num_dec(frame_number, 1);
                }

                if (wire_frame & 1)
                        *hcchar |= HCCHAR_ODDFRM;
                else
                        *hcchar &= ~HCCHAR_ODDFRM;
        }
}

static void dwc2_set_pid_isoc(struct dwc2_host_chan *chan)
{
        /* Set up the initial PID for the transfer */
        if (chan->speed == USB_SPEED_HIGH) {
                if (chan->ep_is_in) {
                        if (chan->multi_count == 1)
                                chan->data_pid_start = DWC2_HC_PID_DATA0;
                        else if (chan->multi_count == 2)
                                chan->data_pid_start = DWC2_HC_PID_DATA1;
                        else
                                chan->data_pid_start = DWC2_HC_PID_DATA2;
                } else {
                        if (chan->multi_count == 1)
                                chan->data_pid_start = DWC2_HC_PID_DATA0;
                        else
                                chan->data_pid_start = DWC2_HC_PID_MDATA;
                }
        } else {
                chan->data_pid_start = DWC2_HC_PID_DATA0;
        }
}

/**
 * dwc2_hc_write_packet() - Writes a packet into the Tx FIFO associated with
 * the Host Channel
 *
 * @hsotg: Programming view of DWC_otg controller
 * @chan:  Information needed to initialize the host channel
 *
 * This function should only be called in Slave mode. For a channel associated
 * with a non-periodic EP, the non-periodic Tx FIFO is written. For a channel
 * associated with a periodic EP, the periodic Tx FIFO is written.
 *
 * Upon return the xfer_buf and xfer_count fields in chan are incremented by
 * the number of bytes written to the Tx FIFO.
 */
static void dwc2_hc_write_packet(struct dwc2_hsotg *hsotg,
                                 struct dwc2_host_chan *chan)
{
        u32 i;
        u32 remaining_count;
        u32 byte_count;
        u32 dword_count;
        u32 *data_buf = (u32 *)chan->xfer_buf;

        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "%s()\n", __func__);

        remaining_count = chan->xfer_len - chan->xfer_count;
        if (remaining_count > chan->max_packet)
                byte_count = chan->max_packet;
        else
                byte_count = remaining_count;

        dword_count = (byte_count + 3) / 4;

        if (((unsigned long)data_buf & 0x3) == 0) {
                /* xfer_buf is DWORD aligned */
                for (i = 0; i < dword_count; i++, data_buf++)
                        dwc2_writel(hsotg, *data_buf, HCFIFO(chan->hc_num));
        } else {
                /* xfer_buf is not DWORD aligned */
                for (i = 0; i < dword_count; i++, data_buf++) {
                        u32 data = data_buf[0] | data_buf[1] << 8 |
                                   data_buf[2] << 16 | data_buf[3] << 24;
                        dwc2_writel(hsotg, data, HCFIFO(chan->hc_num));
                }
        }

        chan->xfer_count += byte_count;
        chan->xfer_buf += byte_count;
}

/**
 * dwc2_hc_do_ping() - Starts a PING transfer
 *
 * @hsotg: Programming view of DWC_otg controller
 * @chan:  Information needed to initialize the host channel
 *
 * This function should only be called in Slave mode. The Do Ping bit is set in
 * the HCTSIZ register, then the channel is enabled.
 */
static void dwc2_hc_do_ping(struct dwc2_hsotg *hsotg,
                            struct dwc2_host_chan *chan)
{
        u32 hcchar;
        u32 hctsiz;

        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
                         chan->hc_num);

        hctsiz = TSIZ_DOPNG;
        hctsiz |= 1 << TSIZ_PKTCNT_SHIFT;
        dwc2_writel(hsotg, hctsiz, HCTSIZ(chan->hc_num));

        hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num));
        hcchar |= HCCHAR_CHENA;
        hcchar &= ~HCCHAR_CHDIS;
        dwc2_writel(hsotg, hcchar, HCCHAR(chan->hc_num));
}

/**
 * dwc2_hc_start_transfer() - Does the setup for a data transfer for a host
 * channel and starts the transfer
 *
 * @hsotg: Programming view of DWC_otg controller
 * @chan:  Information needed to initialize the host channel. The xfer_len value
 *         may be reduced to accommodate the max widths of the XferSize and
 *         PktCnt fields in the HCTSIZn register. The multi_count value may be
 *         changed to reflect the final xfer_len value.
 *
 * This function may be called in either Slave mode or DMA mode. In Slave mode,
 * the caller must ensure that there is sufficient space in the request queue
 * and Tx Data FIFO.
 *
 * For an OUT transfer in Slave mode, it loads a data packet into the
 * appropriate FIFO. If necessary, additional data packets are loaded in the
 * Host ISR.
 *
 * For an IN transfer in Slave mode, a data packet is requested. The data
 * packets are unloaded from the Rx FIFO in the Host ISR. If necessary,
 * additional data packets are requested in the Host ISR.
 *
 * For a PING transfer in Slave mode, the Do Ping bit is set in the HCTSIZ
 * register along with a packet count of 1 and the channel is enabled. This
 * causes a single PING transaction to occur. Other fields in HCTSIZ are
 * simply set to 0 since no data transfer occurs in this case.
 *
 * For a PING transfer in DMA mode, the HCTSIZ register is initialized with
 * all the information required to perform the subsequent data transfer. In
 * addition, the Do Ping bit is set in the HCTSIZ register. In this case, the
 * controller performs the entire PING protocol, then starts the data
 * transfer.
 */
static void dwc2_hc_start_transfer(struct dwc2_hsotg *hsotg,
                                   struct dwc2_host_chan *chan)
{
        u32 max_hc_xfer_size = hsotg->params.max_transfer_size;
        u16 max_hc_pkt_count = hsotg->params.max_packet_count;
        u32 hcchar;
        u32 hctsiz = 0;
        u16 num_packets;
        u32 ec_mc;

        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "%s()\n", __func__);

        if (chan->do_ping) {
                if (!hsotg->params.host_dma) {
                        if (dbg_hc(chan))
                                dev_vdbg(hsotg->dev, "ping, no DMA\n");
                        dwc2_hc_do_ping(hsotg, chan);
                        chan->xfer_started = 1;
                        return;
                }

                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "ping, DMA\n");

                hctsiz |= TSIZ_DOPNG;
        }

        if (chan->do_split) {
                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "split\n");
                num_packets = 1;

                if (chan->complete_split && !chan->ep_is_in)
                        /*
                         * For CSPLIT OUT Transfer, set the size to 0 so the
                         * core doesn't expect any data written to the FIFO
                         */
                        chan->xfer_len = 0;
                else if (chan->ep_is_in || chan->xfer_len > chan->max_packet)
                        chan->xfer_len = chan->max_packet;
                else if (!chan->ep_is_in && chan->xfer_len > 188)
                        chan->xfer_len = 188;

                hctsiz |= chan->xfer_len << TSIZ_XFERSIZE_SHIFT &
                          TSIZ_XFERSIZE_MASK;

                /* For split set ec_mc for immediate retries */
                if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
                    chan->ep_type == USB_ENDPOINT_XFER_ISOC)
                        ec_mc = 3;
                else
                        ec_mc = 1;
        } else {
                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "no split\n");
                /*
                 * Ensure that the transfer length and packet count will fit
                 * in the widths allocated for them in the HCTSIZn register
                 */
                if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
                    chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
                        /*
                         * Make sure the transfer size is no larger than one
                         * (micro)frame's worth of data. (A check was done
                         * when the periodic transfer was accepted to ensure
                         * that a (micro)frame's worth of data can be
                         * programmed into a channel.)
                         */
                        u32 max_periodic_len =
                                chan->multi_count * chan->max_packet;

                        if (chan->xfer_len > max_periodic_len)
                                chan->xfer_len = max_periodic_len;
                } else if (chan->xfer_len > max_hc_xfer_size) {
                        /*
                         * Make sure that xfer_len is a multiple of max packet
                         * size
                         */
                        chan->xfer_len =
                                max_hc_xfer_size - chan->max_packet + 1;
                }

                if (chan->xfer_len > 0) {
                        num_packets = (chan->xfer_len + chan->max_packet - 1) /
                                        chan->max_packet;
                        if (num_packets > max_hc_pkt_count) {
                                num_packets = max_hc_pkt_count;
                                chan->xfer_len = num_packets * chan->max_packet;
                        } else if (chan->ep_is_in) {
                                /*
                                 * Always program an integral # of max packets
                                 * for IN transfers.
                                 * Note: This assumes that the input buffer is
                                 * aligned and sized accordingly.
                                 */
                                chan->xfer_len = num_packets * chan->max_packet;
                        }
                } else {
                        /* Need 1 packet for transfer length of 0 */
                        num_packets = 1;
                }

                if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
                    chan->ep_type == USB_ENDPOINT_XFER_ISOC)
                        /*
                         * Make sure that the multi_count field matches the
                         * actual transfer length
                         */
                        chan->multi_count = num_packets;

                if (chan->ep_type == USB_ENDPOINT_XFER_ISOC)
                        dwc2_set_pid_isoc(chan);

                hctsiz |= chan->xfer_len << TSIZ_XFERSIZE_SHIFT &
                          TSIZ_XFERSIZE_MASK;

                /* The ec_mc gets the multi_count for non-split */
                ec_mc = chan->multi_count;
        }

        chan->start_pkt_count = num_packets;
        hctsiz |= num_packets << TSIZ_PKTCNT_SHIFT & TSIZ_PKTCNT_MASK;
        hctsiz |= chan->data_pid_start << TSIZ_SC_MC_PID_SHIFT &
                  TSIZ_SC_MC_PID_MASK;
        dwc2_writel(hsotg, hctsiz, HCTSIZ(chan->hc_num));
        if (dbg_hc(chan)) {
                dev_vdbg(hsotg->dev, "Wrote %08x to HCTSIZ(%d)\n",
                         hctsiz, chan->hc_num);

                dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
                         chan->hc_num);
                dev_vdbg(hsotg->dev, "   Xfer Size: %d\n",
                         (hctsiz & TSIZ_XFERSIZE_MASK) >>
                         TSIZ_XFERSIZE_SHIFT);
                dev_vdbg(hsotg->dev, "   Num Pkts: %d\n",
                         (hctsiz & TSIZ_PKTCNT_MASK) >>
                         TSIZ_PKTCNT_SHIFT);
                dev_vdbg(hsotg->dev, "   Start PID: %d\n",
                         (hctsiz & TSIZ_SC_MC_PID_MASK) >>
                         TSIZ_SC_MC_PID_SHIFT);
        }

        if (hsotg->params.host_dma) {
                dma_addr_t dma_addr;

                if (chan->align_buf) {
                        if (dbg_hc(chan))
                                dev_vdbg(hsotg->dev, "align_buf\n");
                        dma_addr = chan->align_buf;
                } else {
                        dma_addr = chan->xfer_dma;
                }
                dwc2_writel(hsotg, (u32)dma_addr, HCDMA(chan->hc_num));

                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "Wrote %08lx to HCDMA(%d)\n",
                                 (unsigned long)dma_addr, chan->hc_num);
        }

        /* Start the split */
        if (chan->do_split) {
                u32 hcsplt = dwc2_readl(hsotg, HCSPLT(chan->hc_num));

                hcsplt |= HCSPLT_SPLTENA;
                dwc2_writel(hsotg, hcsplt, HCSPLT(chan->hc_num));
        }

        hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num));
        hcchar &= ~HCCHAR_MULTICNT_MASK;
        hcchar |= (ec_mc << HCCHAR_MULTICNT_SHIFT) & HCCHAR_MULTICNT_MASK;
        dwc2_hc_set_even_odd_frame(hsotg, chan, &hcchar);

        if (hcchar & HCCHAR_CHDIS)
                dev_warn(hsotg->dev,
                         "%s: chdis set, channel %d, hcchar 0x%08x\n",
                         __func__, chan->hc_num, hcchar);

        /* Set host channel enable after all other setup is complete */
        hcchar |= HCCHAR_CHENA;
        hcchar &= ~HCCHAR_CHDIS;

        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "   Multi Cnt: %d\n",
                         (hcchar & HCCHAR_MULTICNT_MASK) >>
                         HCCHAR_MULTICNT_SHIFT);

        dwc2_writel(hsotg, hcchar, HCCHAR(chan->hc_num));
        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "Wrote %08x to HCCHAR(%d)\n", hcchar,
                         chan->hc_num);

        chan->xfer_started = 1;
        chan->requests++;

        if (!hsotg->params.host_dma &&
            !chan->ep_is_in && chan->xfer_len > 0)
                /* Load OUT packet into the appropriate Tx FIFO */
                dwc2_hc_write_packet(hsotg, chan);
}

/**
 * dwc2_hc_start_transfer_ddma() - Does the setup for a data transfer for a
 * host channel and starts the transfer in Descriptor DMA mode
 *
 * @hsotg: Programming view of DWC_otg controller
 * @chan:  Information needed to initialize the host channel
 *
 * Initializes HCTSIZ register. For a PING transfer the Do Ping bit is set.
 * Sets PID and NTD values. For periodic transfers initializes SCHED_INFO field
 * with micro-frame bitmap.
 *
 * Initializes HCDMA register with descriptor list address and CTD value then
 * starts the transfer via enabling the channel.
 */
void dwc2_hc_start_transfer_ddma(struct dwc2_hsotg *hsotg,
                                 struct dwc2_host_chan *chan)
{
        u32 hcchar;
        u32 hctsiz = 0;

        if (chan->do_ping)
                hctsiz |= TSIZ_DOPNG;

        if (chan->ep_type == USB_ENDPOINT_XFER_ISOC)
                dwc2_set_pid_isoc(chan);

        /* Packet Count and Xfer Size are not used in Descriptor DMA mode */
        hctsiz |= chan->data_pid_start << TSIZ_SC_MC_PID_SHIFT &
                  TSIZ_SC_MC_PID_MASK;

        /* 0 - 1 descriptor, 1 - 2 descriptors, etc */
        hctsiz |= (chan->ntd - 1) << TSIZ_NTD_SHIFT & TSIZ_NTD_MASK;

        /* Non-zero only for high-speed interrupt endpoints */
        hctsiz |= chan->schinfo << TSIZ_SCHINFO_SHIFT & TSIZ_SCHINFO_MASK;

        if (dbg_hc(chan)) {
                dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
                         chan->hc_num);
                dev_vdbg(hsotg->dev, "   Start PID: %d\n",
                         chan->data_pid_start);
                dev_vdbg(hsotg->dev, "   NTD: %d\n", chan->ntd - 1);
        }

        dwc2_writel(hsotg, hctsiz, HCTSIZ(chan->hc_num));

        dma_sync_single_for_device(hsotg->dev, chan->desc_list_addr,
                                   chan->desc_list_sz, DMA_TO_DEVICE);

        dwc2_writel(hsotg, chan->desc_list_addr, HCDMA(chan->hc_num));

        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "Wrote %pad to HCDMA(%d)\n",
                         &chan->desc_list_addr, chan->hc_num);

        hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num));
        hcchar &= ~HCCHAR_MULTICNT_MASK;
        hcchar |= chan->multi_count << HCCHAR_MULTICNT_SHIFT &
                  HCCHAR_MULTICNT_MASK;

        if (hcchar & HCCHAR_CHDIS)
                dev_warn(hsotg->dev,
                         "%s: chdis set, channel %d, hcchar 0x%08x\n",
                         __func__, chan->hc_num, hcchar);

        /* Set host channel enable after all other setup is complete */
        hcchar |= HCCHAR_CHENA;
        hcchar &= ~HCCHAR_CHDIS;

        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "   Multi Cnt: %d\n",
                         (hcchar & HCCHAR_MULTICNT_MASK) >>
                         HCCHAR_MULTICNT_SHIFT);

        dwc2_writel(hsotg, hcchar, HCCHAR(chan->hc_num));
        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "Wrote %08x to HCCHAR(%d)\n", hcchar,
                         chan->hc_num);

        chan->xfer_started = 1;
        chan->requests++;
}

/**
 * dwc2_hc_continue_transfer() - Continues a data transfer that was started by
 * a previous call to dwc2_hc_start_transfer()
 *
 * @hsotg: Programming view of DWC_otg controller
 * @chan:  Information needed to initialize the host channel
 *
 * The caller must ensure there is sufficient space in the request queue and Tx
 * Data FIFO. This function should only be called in Slave mode. In DMA mode,
 * the controller acts autonomously to complete transfers programmed to a host
 * channel.
 *
 * For an OUT transfer, a new data packet is loaded into the appropriate FIFO
 * if there is any data remaining to be queued. For an IN transfer, another
 * data packet is always requested. For the SETUP phase of a control transfer,
 * this function does nothing.
 *
 * Return: 1 if a new request is queued, 0 if no more requests are required
 * for this transfer
 */
static int dwc2_hc_continue_transfer(struct dwc2_hsotg *hsotg,
                                     struct dwc2_host_chan *chan)
{
        if (dbg_hc(chan))
                dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__,
                         chan->hc_num);

        if (chan->do_split)
                /* SPLITs always queue just once per channel */
                return 0;

        if (chan->data_pid_start == DWC2_HC_PID_SETUP)
                /* SETUPs are queued only once since they can't be NAK'd */
                return 0;

        if (chan->ep_is_in) {
                /*
                 * Always queue another request for other IN transfers. If
                 * back-to-back INs are issued and NAKs are received for both,
                 * the driver may still be processing the first NAK when the
                 * second NAK is received. When the interrupt handler clears
                 * the NAK interrupt for the first NAK, the second NAK will
                 * not be seen. So we can't depend on the NAK interrupt
                 * handler to requeue a NAK'd request. Instead, IN requests
                 * are issued each time this function is called. When the
                 * transfer completes, the extra requests for the channel will
                 * be flushed.
                 */
                u32 hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num));

                dwc2_hc_set_even_odd_frame(hsotg, chan, &hcchar);
                hcchar |= HCCHAR_CHENA;
                hcchar &= ~HCCHAR_CHDIS;
                if (dbg_hc(chan))
                        dev_vdbg(hsotg->dev, "   IN xfer: hcchar = 0x%08x\n",
                                 hcchar);
                dwc2_writel(hsotg, hcchar, HCCHAR(chan->hc_num));
                chan->requests++;
                return 1;
        }

        /* OUT transfers */

        if (chan->xfer_count < chan->xfer_len) {
                if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
                    chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
                        u32 hcchar = dwc2_readl(hsotg,
                                                HCCHAR(chan->hc_num));

                        dwc2_hc_set_even_odd_frame(hsotg, chan,
                                                   &hcchar);
                }

                /* Load OUT packet into the appropriate Tx FIFO */
                dwc2_hc_write_packet(hsotg, chan);
                chan->requests++;
                return 1;
        }

        return 0;
}

/*
 * =========================================================================
 *  HCD
 * =========================================================================
 */

/*
 * Processes all the URBs in a single list of QHs. Completes them with
 * -ETIMEDOUT and frees the QTD.
 *
 * Must be called with interrupt disabled and spinlock held
 */
static void dwc2_kill_urbs_in_qh_list(struct dwc2_hsotg *hsotg,
                                      struct list_head *qh_list)
{
        struct dwc2_qh *qh, *qh_tmp;
        struct dwc2_qtd *qtd, *qtd_tmp;

        list_for_each_entry_safe(qh, qh_tmp, qh_list, qh_list_entry) {
                list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list,
                                         qtd_list_entry) {
                        dwc2_host_complete(hsotg, qtd, -ECONNRESET);
                        dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
                }
        }
}

static void dwc2_qh_list_free(struct dwc2_hsotg *hsotg,
                              struct list_head *qh_list)
{
        struct dwc2_qtd *qtd, *qtd_tmp;
        struct dwc2_qh *qh, *qh_tmp;
        unsigned long flags;

        if (!qh_list->next)
                /* The list hasn't been initialized yet */
                return;

        spin_lock_irqsave(&hsotg->lock, flags);

        /* Ensure there are no QTDs or URBs left */
        dwc2_kill_urbs_in_qh_list(hsotg, qh_list);

        list_for_each_entry_safe(qh, qh_tmp, qh_list, qh_list_entry) {
                dwc2_hcd_qh_unlink(hsotg, qh);

                /* Free each QTD in the QH's QTD list */
                list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list,
                                         qtd_list_entry)
                        dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);

                if (qh->channel && qh->channel->qh == qh)
                        qh->channel->qh = NULL;

                spin_unlock_irqrestore(&hsotg->lock, flags);
                dwc2_hcd_qh_free(hsotg, qh);
                spin_lock_irqsave(&hsotg->lock, flags);
        }

        spin_unlock_irqrestore(&hsotg->lock, flags);
}

/*
 * Responds with an error status of -ETIMEDOUT to all URBs in the non-periodic
 * and periodic schedules. The QTD associated with each URB is removed from
 * the schedule and freed. This function may be called when a disconnect is
 * detected or when the HCD is being stopped.
 *
 * Must be called with interrupt disabled and spinlock held
 */
static void dwc2_kill_all_urbs(struct dwc2_hsotg *hsotg)
{
        dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_inactive);
        dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_waiting);
        dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_active);
        dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_inactive);
        dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_ready);
        dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_assigned);
        dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_queued);
}

/**
 * dwc2_hcd_start() - Starts the HCD when switching to Host mode
 *
 * @hsotg: Pointer to struct dwc2_hsotg
 */
void dwc2_hcd_start(struct dwc2_hsotg *hsotg)
{
        u32 hprt0;

        if (hsotg->op_state == OTG_STATE_B_HOST) {
                /*
                 * Reset the port. During a HNP mode switch the reset
                 * needs to occur within 1ms and have a duration of at
                 * least 50ms.
                 */
                hprt0 = dwc2_read_hprt0(hsotg);
                hprt0 |= HPRT0_RST;
                dwc2_writel(hsotg, hprt0, HPRT0);
        }

        queue_delayed_work(hsotg->wq_otg, &hsotg->start_work,
                           msecs_to_jiffies(50));
}

/* Must be called with interrupt disabled and spinlock held */
static void dwc2_hcd_cleanup_channels(struct dwc2_hsotg *hsotg)
{
        int num_channels = hsotg->params.host_channels;
        struct dwc2_host_chan *channel;
        u32 hcchar;
        int i;

        if (!hsotg->params.host_dma) {
                /* Flush out any channel requests in slave mode */
                for (i = 0; i < num_channels; i++) {
                        channel = hsotg->hc_ptr_array[i];
                        if (!list_empty(&channel->hc_list_entry))
                                continue;
                        hcchar = dwc2_readl(hsotg, HCCHAR(i));
                        if (hcchar & HCCHAR_CHENA) {
                                hcchar &= ~(HCCHAR_CHENA | HCCHAR_EPDIR);
                                hcchar |= HCCHAR_CHDIS;
                                dwc2_writel(hsotg, hcchar, HCCHAR(i));
                        }
                }
        }

        for (i = 0; i < num_channels; i++) {
                channel = hsotg->hc_ptr_array[i];
                if (!list_empty(&channel->hc_list_entry))
                        continue;
                hcchar = dwc2_readl(hsotg, HCCHAR(i));
                if (hcchar & HCCHAR_CHENA) {
                        /* Halt the channel */
                        hcchar |= HCCHAR_CHDIS;
                        dwc2_writel(hsotg, hcchar, HCCHAR(i));
                }

                dwc2_hc_cleanup(hsotg, channel);
                list_add_tail(&channel->hc_list_entry, &hsotg->free_hc_list);
                /*
                 * Added for Descriptor DMA to prevent channel double cleanup in
                 * release_channel_ddma(), which is called from ep_disable when
                 * device disconnects
                 */
                channel->qh = NULL;
        }
        /* All channels have been freed, mark them available */
        if (hsotg->params.uframe_sched) {
                hsotg->available_host_channels =
                        hsotg->params.host_channels;
        } else {
                hsotg->non_periodic_channels = 0;
                hsotg->periodic_channels = 0;
        }
}

/**
 * dwc2_hcd_connect() - Handles connect of the HCD
 *
 * @hsotg: Pointer to struct dwc2_hsotg
 *
 * Must be called with interrupt disabled and spinlock held
 */
void dwc2_hcd_connect(struct dwc2_hsotg *hsotg)
{
        if (hsotg->lx_state != DWC2_L0)
                usb_hcd_resume_root_hub(hsotg->priv);

        hsotg->flags.b.port_connect_status_change = 1;
        hsotg->flags.b.port_connect_status = 1;
}

/**
 * dwc2_hcd_disconnect() - Handles disconnect of the HCD
 *
 * @hsotg: Pointer to struct dwc2_hsotg
 * @force: If true, we won't try to reconnect even if we see device connected.
 *
 * Must be called with interrupt disabled and spinlock held
 */
void dwc2_hcd_disconnect(struct dwc2_hsotg *hsotg, bool force)
{
        u32 intr;
        u32 hprt0;

        /* Set status flags for the hub driver */
        hsotg->flags.b.port_connect_status_change = 1;
        hsotg->flags.b.port_connect_status = 0;

        /*
         * Shutdown any transfers in process by clearing the Tx FIFO Empty
         * interrupt mask and status bits and disabling subsequent host
         * channel interrupts.
         */
        intr = dwc2_readl(hsotg, GINTMSK);
        intr &= ~(GINTSTS_NPTXFEMP | GINTSTS_PTXFEMP | GINTSTS_HCHINT);
        dwc2_writel(hsotg, intr, GINTMSK);
        intr = GINTSTS_NPTXFEMP | GINTSTS_PTXFEMP | GINTSTS_HCHINT;
        dwc2_writel(hsotg, intr, GINTSTS);

        /*
         * Turn off the vbus power only if the core has transitioned to device
         * mode. If still in host mode, need to keep power on to detect a
         * reconnection.
         */
        if (dwc2_is_device_mode(hsotg)) {
                if (hsotg->op_state != OTG_STATE_A_SUSPEND) {
                        dev_dbg(hsotg->dev, "Disconnect: PortPower off\n");
                        dwc2_writel(hsotg, 0, HPRT0);
                }

                dwc2_disable_host_interrupts(hsotg);
        }

        /* Respond with an error status to all URBs in the schedule */
        dwc2_kill_all_urbs(hsotg);

        if (dwc2_is_host_mode(hsotg))
                /* Clean up any host channels that were in use */
                dwc2_hcd_cleanup_channels(hsotg);

        dwc2_host_disconnect(hsotg);

        /*
         * Add an extra check here to see if we're actually connected but
         * we don't have a detection interrupt pending.  This can happen if:
         *   1. hardware sees connect
         *   2. hardware sees disconnect
         *   3. hardware sees connect
         *   4. dwc2_port_intr() - clears connect interrupt
         *   5. dwc2_handle_common_intr() - calls here
         *
         * Without the extra check here we will end calling disconnect
         * and won't get any future interrupts to handle the connect.
         */
        if (!force) {
                hprt0 = dwc2_readl(hsotg, HPRT0);
                if (!(hprt0 & HPRT0_CONNDET) && (hprt0 & HPRT0_CONNSTS))
                        dwc2_hcd_connect(hsotg);
        }
}

/**
 * dwc2_hcd_rem_wakeup() - Handles Remote Wakeup
 *
 * @hsotg: Pointer to struct dwc2_hsotg
 */
static void dwc2_hcd_rem_wakeup(struct dwc2_hsotg *hsotg)
{
        if (hsotg->bus_suspended) {
                hsotg->flags.b.port_suspend_change = 1;
                usb_hcd_resume_root_hub(hsotg->priv);
        }

        if (hsotg->lx_state == DWC2_L1)
                hsotg->flags.b.port_l1_change = 1;
}

/**
 * dwc2_hcd_stop() - Halts the DWC_otg host mode operations in a clean manner
 *
 * @hsotg: Pointer to struct dwc2_hsotg
 *
 * Must be called with interrupt disabled and spinlock held
 */
void dwc2_hcd_stop(struct dwc2_hsotg *hsotg)
{
        dev_dbg(hsotg->dev, "DWC OTG HCD STOP\n");

        /*
         * The root hub should be disconnected before this function is called.
         * The disconnect will clear the QTD lists (via ..._hcd_urb_dequeue)
         * and the QH lists (via ..._hcd_endpoint_disable).
         */

        /* Turn off all host-specific interrupts */
        dwc2_disable_host_interrupts(hsotg);

        /* Turn off the vbus power */
        dev_dbg(hsotg->dev, "PortPower off\n");
        dwc2_writel(hsotg, 0, HPRT0);
}

/* Caller must hold driver lock */
static int dwc2_hcd_urb_enqueue(struct dwc2_hsotg *hsotg,
                                struct dwc2_hcd_urb *urb, struct dwc2_qh *qh,
                                struct dwc2_qtd *qtd)
{
        u32 intr_mask;
        int retval;
        int dev_speed;

        if (!hsotg->flags.b.port_connect_status) {
                /* No longer connected */
                dev_err(hsotg->dev, "Not connected\n");
                return -ENODEV;
        }

        dev_speed = dwc2_host_get_speed(hsotg, urb->priv);

        /* Some configurations cannot support LS traffic on a FS root port */
        if ((dev_speed == USB_SPEED_LOW) &&
            (hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED) &&
            (hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_UTMI)) {
                u32 hprt0 = dwc2_readl(hsotg, HPRT0);
                u32 prtspd = (hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT;

                if (prtspd == HPRT0_SPD_FULL_SPEED)
                        return -ENODEV;
        }

        if (!qtd)
                return -EINVAL;

        dwc2_hcd_qtd_init(qtd, urb);
        retval = dwc2_hcd_qtd_add(hsotg, qtd, qh);
        if (retval) {
                dev_err(hsotg->dev,
                        "DWC OTG HCD URB Enqueue failed adding QTD. Error status %d\n",
                        retval);
                return retval;
        }

        intr_mask = dwc2_readl(hsotg, GINTMSK);
        if (!(intr_mask & GINTSTS_SOF)) {
                enum dwc2_transaction_type tr_type;

                if (qtd->qh->ep_type == USB_ENDPOINT_XFER_BULK &&
                    !(qtd->urb->flags & URB_GIVEBACK_ASAP))
                        /*
                         * Do not schedule SG transactions until qtd has
                         * URB_GIVEBACK_ASAP set
                         */
                        return 0;

                tr_type = dwc2_hcd_select_transactions(hsotg);
                if (tr_type != DWC2_TRANSACTION_NONE)
                        dwc2_hcd_queue_transactions(hsotg, tr_type);
        }

        return 0;
}

/* Must be called with interrupt disabled and spinlock held */
static int dwc2_hcd_urb_dequeue(struct dwc2_hsotg *hsotg,
                                struct dwc2_hcd_urb *urb)
{
        struct dwc2_qh *qh;
        struct dwc2_qtd *urb_qtd;

        urb_qtd = urb->qtd;
        if (!urb_qtd) {
                dev_dbg(hsotg->dev, "## Urb QTD is NULL ##\n");
                return -EINVAL;
        }

        qh = urb_qtd->qh;
        if (!qh) {
                dev_dbg(hsotg->dev, "## Urb QTD QH is NULL ##\n");
                return -EINVAL;
        }

        urb->priv = NULL;

        if (urb_qtd->in_process && qh->channel) {
                dwc2_dump_channel_info(hsotg, qh->channel);

                /* The QTD is in process (it has been assigned to a channel) */
                if (hsotg->flags.b.port_connect_status)
                        /*
                         * If still connected (i.e. in host mode), halt the
                         * channel so it can be used for other transfers. If
                         * no longer connected, the host registers can't be
                         * written to halt the channel since the core is in
                         * device mode.
                         */
                        dwc2_hc_halt(hsotg, qh->channel,
                                     DWC2_HC_XFER_URB_DEQUEUE);
        }

        /*
         * Free the QTD and clean up the associated QH. Leave the QH in the
         * schedule if it has any remaining QTDs.
         */
        if (!hsotg->params.dma_desc_enable) {
                u8 in_process = urb_qtd->in_process;

                dwc2_hcd_qtd_unlink_and_free(hsotg, urb_qtd, qh);
                if (in_process) {
                        dwc2_hcd_qh_deactivate(hsotg, qh, 0);
                        qh->channel = NULL;
                } else if (list_empty(&qh->qtd_list)) {
                        dwc2_hcd_qh_unlink(hsotg, qh);
                }
        } else {
                dwc2_hcd_qtd_unlink_and_free(hsotg, urb_qtd, qh);
        }

        return 0;
}

/* Must NOT be called with interrupt disabled or spinlock held */
static int dwc2_hcd_endpoint_disable(struct dwc2_hsotg *hsotg,
                                     struct usb_host_endpoint *ep, int retry)
{
        struct dwc2_qtd *qtd, *qtd_tmp;
        struct dwc2_qh *qh;
        unsigned long flags;
        int rc;

        spin_lock_irqsave(&hsotg->lock, flags);

        qh = ep->hcpriv;
        if (!qh) {
                rc = -EINVAL;
                goto err;
        }

        while (!list_empty(&qh->qtd_list) && retry--) {
                if (retry == 0) {
                        dev_err(hsotg->dev,
                                "## timeout in dwc2_hcd_endpoint_disable() ##\n");
                        rc = -EBUSY;
                        goto err;
                }

                spin_unlock_irqrestore(&hsotg->lock, flags);
                msleep(20);
                spin_lock_irqsave(&hsotg->lock, flags);
                qh = ep->hcpriv;
                if (!qh) {
                        rc = -EINVAL;
                        goto err;
                }
        }

        dwc2_hcd_qh_unlink(hsotg, qh);

        /* Free each QTD in the QH's QTD list */
        list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list, qtd_list_entry)
                dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);

        ep->hcpriv = NULL;

        if (qh->channel && qh->channel->qh == qh)
                qh->channel->qh = NULL;

        spin_unlock_irqrestore(&hsotg->lock, flags);

        dwc2_hcd_qh_free(hsotg, qh);

        return 0;

err:
        ep->hcpriv = NULL;
        spin_unlock_irqrestore(&hsotg->lock, flags);

        return rc;
}

/* Must be called with interrupt disabled and spinlock held */
static int dwc2_hcd_endpoint_reset(struct dwc2_hsotg *hsotg,
                                   struct usb_host_endpoint *ep)
{
        struct dwc2_qh *qh = ep->hcpriv;

        if (!qh)
                return -EINVAL;

        qh->data_toggle = DWC2_HC_PID_DATA0;

        return 0;
}

/**
 * dwc2_core_init() - Initializes the DWC_otg controller registers and
 * prepares the core for device mode or host mode operation
 *
 * @hsotg:         Programming view of the DWC_otg controller
 * @initial_setup: If true then this is the first init for this instance.
 */
int dwc2_core_init(struct dwc2_hsotg *hsotg, bool initial_setup)
{
        u32 usbcfg, otgctl;
        int retval;

        dev_dbg(hsotg->dev, "%s(%p)\n", __func__, hsotg);

        usbcfg = dwc2_readl(hsotg, GUSBCFG);

        /* Set ULPI External VBUS bit if needed */
        usbcfg &= ~GUSBCFG_ULPI_EXT_VBUS_DRV;
        if (hsotg->params.phy_ulpi_ext_vbus)
                usbcfg |= GUSBCFG_ULPI_EXT_VBUS_DRV;

        /* Set external TS Dline pulsing bit if needed */
        usbcfg &= ~GUSBCFG_TERMSELDLPULSE;
        if (hsotg->params.ts_dline)
                usbcfg |= GUSBCFG_TERMSELDLPULSE;

        dwc2_writel(hsotg, usbcfg, GUSBCFG);

        /*
         * Reset the Controller
         *
         * We only need to reset the controller if this is a re-init.
         * For the first init we know for sure that earlier code reset us (it
         * needed to in order to properly detect various parameters).
         */
        if (!initial_setup) {
                retval = dwc2_core_reset(hsotg, false);
                if (retval) {
                        dev_err(hsotg->dev, "%s(): Reset failed, aborting\n",
                                __func__);
                        return retval;
                }
        }

        /*
         * This needs to happen in FS mode before any other programming occurs
         */
        retval = dwc2_phy_init(hsotg, initial_setup);
        if (retval)
                return retval;

        /* Program the GAHBCFG Register */
        retval = dwc2_gahbcfg_init(hsotg);
        if (retval)
                return retval;

        /* Program the GUSBCFG register */
        dwc2_gusbcfg_init(hsotg);

        /* Program the GOTGCTL register */
        otgctl = dwc2_readl(hsotg, GOTGCTL);
        otgctl &= ~GOTGCTL_OTGVER;
        dwc2_writel(hsotg, otgctl, GOTGCTL);

        /* Clear the SRP success bit for FS-I2c */
        hsotg->srp_success = 0;

        /* Enable common interrupts */
        dwc2_enable_common_interrupts(hsotg);

        /*
         * Do device or host initialization based on mode during PCD and
         * HCD initialization
         */
        if (dwc2_is_host_mode(hsotg)) {
                dev_dbg(hsotg->dev, "Host Mode\n");
                hsotg->op_state = OTG_STATE_A_HOST;
        } else {
                dev_dbg(hsotg->dev, "Device Mode\n");
                hsotg->op_state = OTG_STATE_B_PERIPHERAL;
        }

        return 0;
}

/**
 * dwc2_core_host_init() - Initializes the DWC_otg controller registers for
 * Host mode
 *
 * @hsotg: Programming view of DWC_otg controller
 *
 * This function flushes the Tx and Rx FIFOs and flushes any entries in the
 * request queues. Host channels are reset to ensure that they are ready for
 * performing transfers.
 */
static void dwc2_core_host_init(struct dwc2_hsotg *hsotg)
{
        u32 hcfg, hfir, otgctl, usbcfg;

        dev_dbg(hsotg->dev, "%s(%p)\n", __func__, hsotg);

        /* Set HS/FS Timeout Calibration to 7 (max available value).
         * The number of PHY clocks that the application programs in
         * this field is added to the high/full speed interpacket timeout
         * duration in the core to account for any additional delays
         * introduced by the PHY. This can be required, because the delay
         * introduced by the PHY in generating the linestate condition
         * can vary from one PHY to another.
         */
        usbcfg = dwc2_readl(hsotg, GUSBCFG);
        usbcfg |= GUSBCFG_TOUTCAL(7);
        dwc2_writel(hsotg, usbcfg, GUSBCFG);

        /* Restart the Phy Clock */
        dwc2_writel(hsotg, 0, PCGCTL);

        /* Initialize Host Configuration Register */
        dwc2_init_fs_ls_pclk_sel(hsotg);
        if (hsotg->params.speed == DWC2_SPEED_PARAM_FULL ||
            hsotg->params.speed == DWC2_SPEED_PARAM_LOW) {
                hcfg = dwc2_readl(hsotg, HCFG);
                hcfg |= HCFG_FSLSSUPP;
                dwc2_writel(hsotg, hcfg, HCFG);
        }

        /*
         * This bit allows dynamic reloading of the HFIR register during
         * runtime. This bit needs to be programmed during initial configuration
         * and its value must not be changed during runtime.
         */
        if (hsotg->params.reload_ctl) {
                hfir = dwc2_readl(hsotg, HFIR);
                hfir |= HFIR_RLDCTRL;
                dwc2_writel(hsotg, hfir, HFIR);
        }

        if (hsotg->params.dma_desc_enable) {
                u32 op_mode = hsotg->hw_params.op_mode;

                if (hsotg->hw_params.snpsid < DWC2_CORE_REV_2_90a ||
                    !hsotg->hw_params.dma_desc_enable ||
                    op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE ||
                    op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE ||
                    op_mode == GHWCFG2_OP_MODE_UNDEFINED) {
                        dev_err(hsotg->dev,
                                "Hardware does not support descriptor DMA mode -\n");
                        dev_err(hsotg->dev,
                                "falling back to buffer DMA mode.\n");
                        hsotg->params.dma_desc_enable = false;
                } else {
                        hcfg = dwc2_readl(hsotg, HCFG);
                        hcfg |= HCFG_DESCDMA;
                        dwc2_writel(hsotg, hcfg, HCFG);
                }
        }

        /* Configure data FIFO sizes */
        dwc2_config_fifos(hsotg);

        /* TODO - check this */
        /* Clear Host Set HNP Enable in the OTG Control Register */
        otgctl = dwc2_readl(hsotg, GOTGCTL);
        otgctl &= ~GOTGCTL_HSTSETHNPEN;
        dwc2_writel(hsotg, otgctl, GOTGCTL);

        /* Make sure the FIFOs are flushed */
        dwc2_flush_tx_fifo(hsotg, 0x10 /* all TX FIFOs */);
        dwc2_flush_rx_fifo(hsotg);

        /* Clear Host Set HNP Enable in the OTG Control Register */
        otgctl = dwc2_readl(hsotg, GOTGCTL);
        otgctl &= ~GOTGCTL_HSTSETHNPEN;
        dwc2_writel(hsotg, otgctl, GOTGCTL);

        if (!hsotg->params.dma_desc_enable) {
                int num_channels, i;
                u32 hcchar;

                /* Flush out any leftover queued requests */
                num_channels = hsotg->params.host_channels;
                for (i = 0; i < num_channels; i++) {
                        hcchar = dwc2_readl(hsotg, HCCHAR(i));
                        if (hcchar & HCCHAR_CHENA) {
                                hcchar &= ~HCCHAR_CHENA;
                                hcchar |= HCCHAR_CHDIS;
                                hcchar &= ~HCCHAR_EPDIR;
                                dwc2_writel(hsotg, hcchar, HCCHAR(i));
                        }
                }

                /* Halt all channels to put them into a known state */
                for (i = 0; i < num_channels; i++) {
                        hcchar = dwc2_readl(hsotg, HCCHAR(i));
                        if (hcchar & HCCHAR_CHENA) {
                                hcchar |= HCCHAR_CHENA | HCCHAR_CHDIS;
                                hcchar &= ~HCCHAR_EPDIR;
                                dwc2_writel(hsotg, hcchar, HCCHAR(i));
                                dev_dbg(hsotg->dev, "%s: Halt channel %d\n",
                                        __func__, i);

                                if (dwc2_hsotg_wait_bit_clear(hsotg, HCCHAR(i),
                                                              HCCHAR_CHENA,
                                                              1000)) {
                                        dev_warn(hsotg->dev,
                                                 "Unable to clear enable on channel %d\n",
                                                 i);
                                }
                        }
                }
        }

        /* Enable ACG feature in host mode, if supported */
        dwc2_enable_acg(hsotg);

        /* Turn on the vbus power */
        dev_dbg(hsotg->dev, "Init: Port Power? op_state=%d\n", hsotg->op_state);
        if (hsotg->op_state == OTG_STATE_A_HOST) {
                u32 hprt0 = dwc2_read_hprt0(hsotg);

                dev_dbg(hsotg->dev, "Init: Power Port (%d)\n",
                        !!(hprt0 & HPRT0_PWR));
                if (!(hprt0 & HPRT0_PWR)) {
                        hprt0 |= HPRT0_PWR;
                        dwc2_writel(hsotg, hprt0, HPRT0);
                }
        }

        dwc2_enable_host_interrupts(hsotg);
}

/*
 * Initializes dynamic portions of the DWC_otg HCD state
 *
 * Must be called with interrupt disabled and spinlock held
 */
static void dwc2_hcd_reinit(struct dwc2_hsotg *hsotg)
{
        struct dwc2_host_chan *chan, *chan_tmp;
        int num_channels;
        int i;

        hsotg->flags.d32 = 0;
        hsotg->non_periodic_qh_ptr = &hsotg->non_periodic_sched_active;

        if (hsotg->params.uframe_sched) {
                hsotg->available_host_channels =
                        hsotg->params.host_channels;
        } else {
                hsotg->non_periodic_channels = 0;
                hsotg->periodic_channels = 0;
        }

        /*
         * Put all channels in the free channel list and clean up channel
         * states
         */
        list_for_each_entry_safe(chan, chan_tmp, &hsotg->free_hc_list,
                                 hc_list_entry)
                list_del_init(&chan->hc_list_entry);

        num_channels = hsotg->params.host_channels;
        for (i = 0; i < num_channels; i++) {
                chan = hsotg->hc_ptr_array[i];
                list_add_tail(&chan->hc_list_entry, &hsotg->free_hc_list);
                dwc2_hc_cleanup(hsotg, chan);
        }

        /* Initialize the DWC core for host mode operation */
        dwc2_core_host_init(hsotg);
}

static void dwc2_hc_init_split(struct dwc2_hsotg *hsotg,
                               struct dwc2_host_chan *chan,
                               struct dwc2_qtd *qtd, struct dwc2_hcd_urb *urb)
{
        int hub_addr, hub_port;

        chan->do_split = 1;
        chan->xact_pos = qtd->isoc_split_pos;
        chan->complete_split = qtd->complete_split;
        dwc2_host_hub_info(hsotg, urb->priv, &hub_addr, &hub_port);
        chan->hub_addr = (u8)hub_addr;
        chan->hub_port = (u8)hub_port;
}

static void dwc2_hc_init_xfer(struct dwc2_hsotg *hsotg,
                              struct dwc2_host_chan *chan,
                              struct dwc2_qtd *qtd)
{
        struct dwc2_hcd_urb *urb = qtd->urb;
        struct dwc2_hcd_iso_packet_desc *frame_desc;

        switch (dwc2_hcd_get_pipe_type(&urb->pipe_info)) {
        case USB_ENDPOINT_XFER_CONTROL:
                chan->ep_type = USB_ENDPOINT_XFER_CONTROL;

                switch (qtd->control_phase) {
                case DWC2_CONTROL_SETUP:
                        dev_vdbg(hsotg->dev, "  Control setup transaction\n");
                        chan->do_ping = 0;
                        chan->ep_is_in = 0;
                        chan->data_pid_start = DWC2_HC_PID_SETUP;
                        if (hsotg->params.host_dma)
                                chan->xfer_dma = urb->setup_dma;
                        else
                                chan->xfer_buf = urb->setup_packet;
                        chan->xfer_len = 8;
                        break;

                case DWC2_CONTROL_DATA:
                        dev_vdbg(hsotg->dev, "  Control data transaction\n");
                        chan->data_pid_start = qtd->data_toggle;
                        break;

                case DWC2_CONTROL_STATUS:
                        /*
                         * Direction is opposite of data direction or IN if no
                         * data
                         */
                        dev_vdbg(hsotg->dev, "  Control status transaction\n");
                        if (urb->length == 0)
                                chan->ep_is_in = 1;
                        else
                                chan->ep_is_in =
                                        dwc2_hcd_is_pipe_out(&urb->pipe_info);
                        if (chan->ep_is_in)
                                chan->do_ping = 0;
                        chan->data_pid_start = DWC2_HC_PID_DATA1;
                        chan->xfer_len = 0;
                        if (hsotg->params.host_dma)
                                chan->xfer_dma = hsotg->status_buf_dma;
                        else
                                chan->xfer_buf = hsotg->status_buf;
                        break;
                }
                break;

        case USB_ENDPOINT_XFER_BULK:
                chan->ep_type = USB_ENDPOINT_XFER_BULK;
                break;

        case USB_ENDPOINT_XFER_INT:
                chan->ep_type = USB_ENDPOINT_XFER_INT;
                break;

        case USB_ENDPOINT_XFER_ISOC:
                chan->ep_type = USB_ENDPOINT_XFER_ISOC;
                if (hsotg->params.dma_desc_enable)
                        break;

                frame_desc = &urb->iso_descs[qtd->isoc_frame_index];
                frame_desc->status = 0;

                if (hsotg->params.host_dma) {
                        chan->xfer_dma = urb->dma;
                        chan->xfer_dma += frame_desc->offset +
                                        qtd->isoc_split_offset;
                } else {
                        chan->xfer_buf = urb->buf;
                        chan->xfer_buf += frame_desc->offset +
                                        qtd->isoc_split_offset;
                }

                chan->xfer_len = frame_desc->length - qtd->isoc_split_offset;

                if (chan->xact_pos == DWC2_HCSPLT_XACTPOS_ALL) {
                        if (chan->xfer_len <= 188)
                                chan->xact_pos = DWC2_HCSPLT_XACTPOS_ALL;
                        else
                                chan->xact_pos = DWC2_HCSPLT_XACTPOS_BEGIN;
                }
                break;
        }
}

static int dwc2_alloc_split_dma_aligned_buf(struct dwc2_hsotg *hsotg,
                                            struct dwc2_qh *qh,
                                            struct dwc2_host_chan *chan)
{
        if (!hsotg->unaligned_cache ||
            chan->max_packet > DWC2_KMEM_UNALIGNED_BUF_SIZE)
                return -ENOMEM;

        if (!qh->dw_align_buf) {
                qh->dw_align_buf = kmem_cache_alloc(hsotg->unaligned_cache,
                                                    GFP_ATOMIC | GFP_DMA);
                if (!qh->dw_align_buf)
                        return -ENOMEM;
        }

        qh->dw_align_buf_dma = dma_map_single(hsotg->dev, qh->dw_align_buf,
                                              DWC2_KMEM_UNALIGNED_BUF_SIZE,
                                              DMA_FROM_DEVICE);

        if (dma_mapping_error(hsotg->dev, qh->dw_align_buf_dma)) {
                dev_err(hsotg->dev, "can't map align_buf\n");
                chan->align_buf = 0;
                return -EINVAL;
        }

        chan->align_buf = qh->dw_align_buf_dma;
        return 0;
}

#define DWC2_USB_DMA_ALIGN 4

static void dwc2_free_dma_aligned_buffer(struct urb *urb)
{
        void *stored_xfer_buffer;
        size_t length;

        if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
                return;

        /* Restore urb->transfer_buffer from the end of the allocated area */
        memcpy(&stored_xfer_buffer,
               PTR_ALIGN(urb->transfer_buffer + urb->transfer_buffer_length,
                         dma_get_cache_alignment()),
               sizeof(urb->transfer_buffer));

        if (usb_urb_dir_in(urb)) {
                if (usb_pipeisoc(urb->pipe))
                        length = urb->transfer_buffer_length;
                else
                        length = urb->actual_length;

                memcpy(stored_xfer_buffer, urb->transfer_buffer, length);
        }
        kfree(urb->transfer_buffer);
        urb->transfer_buffer = stored_xfer_buffer;

        urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
}

static int dwc2_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags)
{
        void *kmalloc_ptr;
        size_t kmalloc_size;

        if (urb->num_sgs || urb->sg ||
            urb->transfer_buffer_length == 0 ||
            !((uintptr_t)urb->transfer_buffer & (DWC2_USB_DMA_ALIGN - 1)))
                return 0;

        /*
         * Allocate a buffer with enough padding for original transfer_buffer
         * pointer. This allocation is guaranteed to be aligned properly for
         * DMA
         */
        kmalloc_size = urb->transfer_buffer_length +
                (dma_get_cache_alignment() - 1) +
                sizeof(urb->transfer_buffer);

        kmalloc_ptr = kmalloc(kmalloc_size, mem_flags);
        if (!kmalloc_ptr)
                return -ENOMEM;

        /*
         * Position value of original urb->transfer_buffer pointer to the end
         * of allocation for later referencing
         */
        memcpy(PTR_ALIGN(kmalloc_ptr + urb->transfer_buffer_length,
                         dma_get_cache_alignment()),
               &urb->transfer_buffer, sizeof(urb->transfer_buffer));

        if (usb_urb_dir_out(urb))
                memcpy(kmalloc_ptr, urb->transfer_buffer,
                       urb->transfer_buffer_length);
        urb->transfer_buffer = kmalloc_ptr;

        urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER;

        return 0;
}

static int dwc2_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
                                gfp_t mem_flags)
{
        int ret;

        /* We assume setup_dma is always aligned; warn if not */
        WARN_ON_ONCE(urb->setup_dma &&
                     (urb->setup_dma & (DWC2_USB_DMA_ALIGN - 1)));

        ret = dwc2_alloc_dma_aligned_buffer(urb, mem_flags);
        if (ret)
                return ret;

        ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
        if (ret)
                dwc2_free_dma_aligned_buffer(urb);

        return ret;
}

static void dwc2_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
{
        usb_hcd_unmap_urb_for_dma(hcd, urb);
        dwc2_free_dma_aligned_buffer(urb);
}

/**
 * dwc2_assign_and_init_hc() - Assigns transactions from a QTD to a free host
 * channel and initializes the host channel to perform the transactions. The
 * host channel is removed from the free list.
 *
 * @hsotg: The HCD state structure
 * @qh:    Transactions from the first QTD for this QH are selected and assigned
 *         to a free host channel
 */
static int dwc2_assign_and_init_hc(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
{
        struct dwc2_host_chan *chan;
        struct dwc2_hcd_urb *urb;
        struct dwc2_qtd *qtd;

        if (dbg_qh(qh))
                dev_vdbg(hsotg->dev, "%s(%p,%p)\n", __func__, hsotg, qh);

        if (list_empty(&qh->qtd_list)) {
                dev_dbg(hsotg->dev, "No QTDs in QH list\n");
                return -ENOMEM;
        }

        if (list_empty(&hsotg->free_hc_list)) {
                dev_dbg(hsotg->dev, "No free channel to assign\n");
                return -ENOMEM;
        }

        chan = list_first_entry(&hsotg->free_hc_list, struct dwc2_host_chan,
                                hc_list_entry);

        /* Remove host channel from free list */
        list_del_init(&chan->hc_list_entry);

        qtd = list_first_entry(&qh->qtd_list, struct dwc2_qtd, qtd_list_entry);
        urb = qtd->urb;
        qh->channel = chan;
        qtd->in_process = 1;

        /*
         * Use usb_pipedevice to determine device address. This address is
         * 0 before the SET_ADDRESS command and the correct address afterward.
         */
        chan->dev_addr = dwc2_hcd_get_dev_addr(&urb->pipe_info);
        chan->ep_num = dwc2_hcd_get_ep_num(&urb->pipe_info);
        chan->speed = qh->dev_speed;
        chan->max_packet = qh->maxp;

        chan->xfer_started = 0;
        chan->halt_status = DWC2_HC_XFER_NO_HALT_STATUS;
        chan->error_state = (qtd->error_count > 0);
        chan->halt_on_queue = 0;
        chan->halt_pending = 0;
        chan->requests = 0;

        /*
         * The following values may be modified in the transfer type section
         * below. The xfer_len value may be reduced when the transfer is
         * started to accommodate the max widths of the XferSize and PktCnt
         * fields in the HCTSIZn register.
         */

        chan->ep_is_in = (dwc2_hcd_is_pipe_in(&urb->pipe_info) != 0);
        if (chan->ep_is_in)
                chan->do_ping = 0;
        else
                chan->do_ping = qh->ping_state;

        chan->data_pid_start = qh->data_toggle;
        chan->multi_count = 1;

        if (urb->actual_length > urb->length &&
            !dwc2_hcd_is_pipe_in(&urb->pipe_info))
                urb->actual_length = urb->length;

        if (hsotg->params.host_dma)
                chan->xfer_dma = urb->dma + urb->actual_length;
        else
                chan->xfer_buf = (u8 *)urb->buf + urb->actual_length;

        chan->xfer_len = urb->length - urb->actual_length;
        chan->xfer_count = 0;

        /* Set the split attributes if required */
        if (qh->do_split)
                dwc2_hc_init_split(hsotg, chan, qtd, urb);
        else
                chan->do_split = 0;

        /* Set the transfer attributes */
        dwc2_hc_init_xfer(hsotg, chan, qtd);

        /* For non-dword aligned buffers */
        if (hsotg->params.host_dma && qh->do_split &&
            chan->ep_is_in && (chan->xfer_dma & 0x3)) {
                dev_vdbg(hsotg->dev, "Non-aligned buffer\n");
                if (dwc2_alloc_split_dma_aligned_buf(hsotg, qh, chan)) {
                        dev_err(hsotg->dev,
                                "Failed to allocate memory to handle non-aligned buffer\n");
                        /* Add channel back to free list */
                        chan->align_buf = 0;
                        chan->multi_count = 0;
                        list_add_tail(&chan->hc_list_entry,
                                      &hsotg->free_hc_list);
                        qtd->in_process = 0;
                        qh->channel = NULL;
                        return -ENOMEM;
                }
        } else {
                /*
                 * We assume that DMA is always aligned in non-split
                 * case or split out case. Warn if not.
                 */
                WARN_ON_ONCE(hsotg->params.host_dma &&
                             (chan->xfer_dma & 0x3));
                chan->align_buf = 0;
        }

        if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
            chan->ep_type == USB_ENDPOINT_XFER_ISOC)
                /*
                 * This value may be modified when the transfer is started
                 * to reflect the actual transfer length
                 */
                chan->multi_count = qh->maxp_mult;

        if (hsotg->params.dma_desc_enable) {
                chan->desc_list_addr = qh->desc_list_dma;
                chan->desc_list_sz = qh->desc_list_sz;
        }

        dwc2_hc_init(hsotg, chan);
        chan->qh = qh;

        return 0;
}

/**
 * dwc2_hcd_select_transactions() - Selects transactions from the HCD transfer
 * schedule and assigns them to available host channels. Called from the HCD
 * interrupt handler functions.
 *
 * @hsotg: The HCD state structure
 *
 * Return: The types of new transactions that were assigned to host channels
 */
enum dwc2_transaction_type dwc2_hcd_select_transactions(
                struct dwc2_hsotg *hsotg)
{
        enum dwc2_transaction_type ret_val = DWC2_TRANSACTION_NONE;
        struct list_head *qh_ptr;
        struct dwc2_qh *qh;
        int num_channels;

#ifdef DWC2_DEBUG_SOF
        dev_vdbg(hsotg->dev, "  Select Transactions\n");
#endif

        /* Process entries in the periodic ready list */
        qh_ptr = hsotg->periodic_sched_ready.next;
        while (qh_ptr != &hsotg->periodic_sched_ready) {
                if (list_empty(&hsotg->free_hc_list))
                        break;
                if (hsotg->params.uframe_sched) {
                        if (hsotg->available_host_channels <= 1)
                                break;
                        hsotg->available_host_channels--;
                }
                qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry);
                if (dwc2_assign_and_init_hc(hsotg, qh)) {
                        if (hsotg->params.uframe_sched)
                                hsotg->available_host_channels++;
                        break;
                }

                /*
                 * Move the QH from the periodic ready schedule to the
                 * periodic assigned schedule
                 */
                qh_ptr = qh_ptr->next;
                list_move_tail(&qh->qh_list_entry,
                               &hsotg->periodic_sched_assigned);
                ret_val = DWC2_TRANSACTION_PERIODIC;
        }

        /*
         * Process entries in the inactive portion of the non-periodic
         * schedule. Some free host channels may not be used if they are
         * reserved for periodic transfers.
         */
        num_channels = hsotg->params.host_channels;
        qh_ptr = hsotg->non_periodic_sched_inactive.next;
        while (qh_ptr != &hsotg->non_periodic_sched_inactive) {
                if (!hsotg->params.uframe_sched &&
                    hsotg->non_periodic_channels >= num_channels -
                                                hsotg->periodic_channels)
                        break;
                if (list_empty(&hsotg->free_hc_list))
                        break;
                qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry);
                if (hsotg->params.uframe_sched) {
                        if (hsotg->available_host_channels < 1)
                                break;
                        hsotg->available_host_channels--;
                }

                if (dwc2_assign_and_init_hc(hsotg, qh)) {
                        if (hsotg->params.uframe_sched)
                                hsotg->available_host_channels++;
                        break;
                }

                /*
                 * Move the QH from the non-periodic inactive schedule to the
                 * non-periodic active schedule
                 */
                qh_ptr = qh_ptr->next;
                list_move_tail(&qh->qh_list_entry,
                               &hsotg->non_periodic_sched_active);

                if (ret_val == DWC2_TRANSACTION_NONE)
                        ret_val = DWC2_TRANSACTION_NON_PERIODIC;
                else
                        ret_val = DWC2_TRANSACTION_ALL;

                if (!hsotg->params.uframe_sched)
                        hsotg->non_periodic_channels++;
        }

        return ret_val;
}

/**
 * dwc2_queue_transaction() - Attempts to queue a single transaction request for
 * a host channel associated with either a periodic or non-periodic transfer
 *
 * @hsotg: The HCD state structure
 * @chan:  Host channel descriptor associated with either a periodic or
 *         non-periodic transfer
 * @fifo_dwords_avail: Number of DWORDs available in the periodic Tx FIFO
 *                     for periodic transfers or the non-periodic Tx FIFO
 *                     for non-periodic transfers
 *
 * Return: 1 if a request is queued and more requests may be needed to
 * complete the transfer, 0 if no more requests are required for this
 * transfer, -1 if there is insufficient space in the Tx FIFO
 *
 * This function assumes that there is space available in the appropriate
 * request queue. For an OUT transfer or SETUP transaction in Slave mode,
 * it checks whether space is available in the appropriate Tx FIFO.
 *
 * Must be called with interrupt disabled and spinlock held
 */
static int dwc2_queue_transaction(struct dwc2_hsotg *hsotg,
                                  struct dwc2_host_chan *chan,
                                  u16 fifo_dwords_avail)
{
        int retval = 0;

        if (chan->do_split)
                /* Put ourselves on the list to keep order straight */
                list_move_tail(&chan->split_order_list_entry,
                               &hsotg->split_order);

        if (hsotg->params.host_dma && chan->qh) {
                if (hsotg->params.dma_desc_enable) {
                        if (!chan->xfer_started ||
                            chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
                                dwc2_hcd_start_xfer_ddma(hsotg, chan->qh);
                                chan->qh->ping_state = 0;
                        }
                } else if (!chan->xfer_started) {
                        dwc2_hc_start_transfer(hsotg, chan);
                        chan->qh->ping_state = 0;
                }
        } else if (chan->halt_pending) {
                /* Don't queue a request if the channel has been halted */
        } else if (chan->halt_on_queue) {
                dwc2_hc_halt(hsotg, chan, chan->halt_status);
        } else if (chan->do_ping) {
                if (!chan->xfer_started)
                        dwc2_hc_start_transfer(hsotg, chan);
        } else if (!chan->ep_is_in ||
                   chan->data_pid_start == DWC2_HC_PID_SETUP) {
                if ((fifo_dwords_avail * 4) >= chan->max_packet) {
                        if (!chan->xfer_started) {
                                dwc2_hc_start_transfer(hsotg, chan);
                                retval = 1;
                        } else {
                                retval = dwc2_hc_continue_transfer(hsotg, chan);
                        }
                } else {
                        retval = -1;
                }
        } else {
                if (!chan->xfer_started) {
                        dwc2_hc_start_transfer(hsotg, chan);
                        retval = 1;
                } else {
                        retval = dwc2_hc_continue_transfer(hsotg, chan);
                }
        }

        return retval;
}

/*
 * Processes periodic channels for the next frame and queues transactions for
 * these channels to the DWC_otg controller. After queueing transactions, the
 * Periodic Tx FIFO Empty interrupt is enabled if there are more transactions
 * to queue as Periodic Tx FIFO or request queue space becomes available.
 * Otherwise, the Periodic Tx FIFO Empty interrupt is disabled.
 *
 * Must be called with interrupt disabled and spinlock held
 */
static void dwc2_process_periodic_channels(struct dwc2_hsotg *hsotg)
{
        struct list_head *qh_ptr;
        struct dwc2_qh *qh;
        u32 tx_status;
        u32 fspcavail;
        u32 gintmsk;
        int status;
        bool no_queue_space = false;
        bool no_fifo_space = false;
        u32 qspcavail;

        /* If empty list then just adjust interrupt enables */
        if (list_empty(&hsotg->periodic_sched_assigned))
                goto exit;

        if (dbg_perio())
                dev_vdbg(hsotg->dev, "Queue periodic transactions\n");

        tx_status = dwc2_readl(hsotg, HPTXSTS);
        qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
                    TXSTS_QSPCAVAIL_SHIFT;
        fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
                    TXSTS_FSPCAVAIL_SHIFT;

        if (dbg_perio()) {
                dev_vdbg(hsotg->dev, "  P Tx Req Queue Space Avail (before queue): %d\n",
                         qspcavail);
                dev_vdbg(hsotg->dev, "  P Tx FIFO Space Avail (before queue): %d\n",
                         fspcavail);
        }

        qh_ptr = hsotg->periodic_sched_assigned.next;
        while (qh_ptr != &hsotg->periodic_sched_assigned) {
                tx_status = dwc2_readl(hsotg, HPTXSTS);
                qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
                            TXSTS_QSPCAVAIL_SHIFT;
                if (qspcavail == 0) {
                        no_queue_space = true;
                        break;
                }

                qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry);
                if (!qh->channel) {
                        qh_ptr = qh_ptr->next;
                        continue;
                }

                /* Make sure EP's TT buffer is clean before queueing qtds */
                if (qh->tt_buffer_dirty) {
                        qh_ptr = qh_ptr->next;
                        continue;
                }

                /*
                 * Set a flag if we're queuing high-bandwidth in slave mode.
                 * The flag prevents any halts to get into the request queue in
                 * the middle of multiple high-bandwidth packets getting queued.
                 */
                if (!hsotg->params.host_dma &&
                    qh->channel->multi_count > 1)
                        hsotg->queuing_high_bandwidth = 1;

                fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
                            TXSTS_FSPCAVAIL_SHIFT;
                status = dwc2_queue_transaction(hsotg, qh->channel, fspcavail);
                if (status < 0) {
                        no_fifo_space = true;
                        break;
                }

                /*
                 * In Slave mode, stay on the current transfer until there is
                 * nothing more to do or the high-bandwidth request count is
                 * reached. In DMA mode, only need to queue one request. The
                 * controller automatically handles multiple packets for
                 * high-bandwidth transfers.
                 */
                if (hsotg->params.host_dma || status == 0 ||
                    qh->channel->requests == qh->channel->multi_count) {
                        qh_ptr = qh_ptr->next;
                        /*
                         * Move the QH from the periodic assigned schedule to
                         * the periodic queued schedule
                         */
                        list_move_tail(&qh->qh_list_entry,
                                       &hsotg->periodic_sched_queued);

                        /* done queuing high bandwidth */
                        hsotg->queuing_high_bandwidth = 0;
                }
        }

exit:
        if (no_queue_space || no_fifo_space ||
            (!hsotg->params.host_dma &&
             !list_empty(&hsotg->periodic_sched_assigned))) {
                /*
                 * May need to queue more transactions as the request
                 * queue or Tx FIFO empties. Enable the periodic Tx
                 * FIFO empty interrupt. (Always use the half-empty
                 * level to ensure that new requests are loaded as
                 * soon as possible.)
                 */
                gintmsk = dwc2_readl(hsotg, GINTMSK);
                if (!(gintmsk & GINTSTS_PTXFEMP)) {
                        gintmsk |= GINTSTS_PTXFEMP;
                        dwc2_writel(hsotg, gintmsk, GINTMSK);
                }
        } else {
                /*
                 * Disable the Tx FIFO empty interrupt since there are
                 * no more transactions that need to be queued right
                 * now. This function is called from interrupt
                 * handlers to queue more transactions as transfer
                 * states change.
                 */
                gintmsk = dwc2_readl(hsotg, GINTMSK);
                if (gintmsk & GINTSTS_PTXFEMP) {
                        gintmsk &= ~GINTSTS_PTXFEMP;
                        dwc2_writel(hsotg, gintmsk, GINTMSK);
                }
        }
}

/*
 * Processes active non-periodic channels and queues transactions for these
 * channels to the DWC_otg controller. After queueing transactions, the NP Tx
 * FIFO Empty interrupt is enabled if there are more transactions to queue as
 * NP Tx FIFO or request queue space becomes available. Otherwise, the NP Tx
 * FIFO Empty interrupt is disabled.
 *
 * Must be called with interrupt disabled and spinlock held
 */
static void dwc2_process_non_periodic_channels(struct dwc2_hsotg *hsotg)
{
        struct list_head *orig_qh_ptr;
        struct dwc2_qh *qh;
        u32 tx_status;
        u32 qspcavail;
        u32 fspcavail;
        u32 gintmsk;
        int status;
        int no_queue_space = 0;
        int no_fifo_space = 0;
        int more_to_do = 0;

        dev_vdbg(hsotg->dev, "Queue non-periodic transactions\n");

        tx_status = dwc2_readl(hsotg, GNPTXSTS);
        qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
                    TXSTS_QSPCAVAIL_SHIFT;
        fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
                    TXSTS_FSPCAVAIL_SHIFT;
        dev_vdbg(hsotg->dev, "  NP Tx Req Queue Space Avail (before queue): %d\n",
                 qspcavail);
        dev_vdbg(hsotg->dev, "  NP Tx FIFO Space Avail (before queue): %d\n",
                 fspcavail);

        /*
         * Keep track of the starting point. Skip over the start-of-list
         * entry.
         */
        if (hsotg->non_periodic_qh_ptr == &hsotg->non_periodic_sched_active)
                hsotg->non_periodic_qh_ptr = hsotg->non_periodic_qh_ptr->next;
        orig_qh_ptr = hsotg->non_periodic_qh_ptr;

        /*
         * Process once through the active list or until no more space is
         * available in the request queue or the Tx FIFO
         */
        do {
                tx_status = dwc2_readl(hsotg, GNPTXSTS);
                qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
                            TXSTS_QSPCAVAIL_SHIFT;
                if (!hsotg->params.host_dma && qspcavail == 0) {
                        no_queue_space = 1;
                        break;
                }

                qh = list_entry(hsotg->non_periodic_qh_ptr, struct dwc2_qh,
                                qh_list_entry);
                if (!qh->channel)
                        goto next;

                /* Make sure EP's TT buffer is clean before queueing qtds */
                if (qh->tt_buffer_dirty)
                        goto next;

                fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
                            TXSTS_FSPCAVAIL_SHIFT;
                status = dwc2_queue_transaction(hsotg, qh->channel, fspcavail);

                if (status > 0) {
                        more_to_do = 1;
                } else if (status < 0) {
                        no_fifo_space = 1;
                        break;
                }
next:
                /* Advance to next QH, skipping start-of-list entry */
                hsotg->non_periodic_qh_ptr = hsotg->non_periodic_qh_ptr->next;
                if (hsotg->non_periodic_qh_ptr ==
                                &hsotg->non_periodic_sched_active)
                        hsotg->non_periodic_qh_ptr =
                                        hsotg->non_periodic_qh_ptr->next;
        } while (hsotg->non_periodic_qh_ptr != orig_qh_ptr);

        if (!hsotg->params.host_dma) {
                tx_status = dwc2_readl(hsotg, GNPTXSTS);
                qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
                            TXSTS_QSPCAVAIL_SHIFT;
                fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
                            TXSTS_FSPCAVAIL_SHIFT;
                dev_vdbg(hsotg->dev,
                         "  NP Tx Req Queue Space Avail (after queue): %d\n",
                         qspcavail);
                dev_vdbg(hsotg->dev,
                         "  NP Tx FIFO Space Avail (after queue): %d\n",
                         fspcavail);

                if (more_to_do || no_queue_space || no_fifo_space) {
                        /*
                         * May need to queue more transactions as the request
                         * queue or Tx FIFO empties. Enable the non-periodic
                         * Tx FIFO empty interrupt. (Always use the half-empty
                         * level to ensure that new requests are loaded as
                         * soon as possible.)
                         */
                        gintmsk = dwc2_readl(hsotg, GINTMSK);
                        gintmsk |= GINTSTS_NPTXFEMP;
                        dwc2_writel(hsotg, gintmsk, GINTMSK);
                } else {
                        /*
                         * Disable the Tx FIFO empty interrupt since there are
                         * no more transactions that need to be queued right
                         * now. This function is called from interrupt
                         * handlers to queue more transactions as transfer
                         * states change.
                         */
                        gintmsk = dwc2_readl(hsotg, GINTMSK);
                        gintmsk &= ~GINTSTS_NPTXFEMP;
                        dwc2_writel(hsotg, gintmsk, GINTMSK);
                }
        }
}

/**
 * dwc2_hcd_queue_transactions() - Processes the currently active host channels
 * and queues transactions for these channels to the DWC_otg controller. Called
 * from the HCD interrupt handler functions.
 *
 * @hsotg:   The HCD state structure
 * @tr_type: The type(s) of transactions to queue (non-periodic, periodic,
 *           or both)
 *
 * Must be called with interrupt disabled and spinlock held
 */
void dwc2_hcd_queue_transactions(struct dwc2_hsotg *hsotg,
                                 enum dwc2_transaction_type tr_type)
{
#ifdef DWC2_DEBUG_SOF
        dev_vdbg(hsotg->dev, "Queue Transactions\n");
#endif
        /* Process host channels associated with periodic transfers */
        if (tr_type == DWC2_TRANSACTION_PERIODIC ||
            tr_type == DWC2_TRANSACTION_ALL)
                dwc2_process_periodic_channels(hsotg);

        /* Process host channels associated with non-periodic transfers */
        if (tr_type == DWC2_TRANSACTION_NON_PERIODIC ||
            tr_type == DWC2_TRANSACTION_ALL) {
                if (!list_empty(&hsotg->non_periodic_sched_active)) {
                        dwc2_process_non_periodic_channels(hsotg);
                } else {
                        /*
                         * Ensure NP Tx FIFO empty interrupt is disabled when
                         * there are no non-periodic transfers to process
                         */
                        u32 gintmsk = dwc2_readl(hsotg, GINTMSK);

                        gintmsk &= ~GINTSTS_NPTXFEMP;
                        dwc2_writel(hsotg, gintmsk, GINTMSK);
                }
        }
}

static void dwc2_conn_id_status_change(struct work_struct *work)
{
        struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg,
                                                wf_otg);
        u32 count = 0;
        u32 gotgctl;
        unsigned long flags;

        dev_dbg(hsotg->dev, "%s()\n", __func__);

        gotgctl = dwc2_readl(hsotg, GOTGCTL);
        dev_dbg(hsotg->dev, "gotgctl=%0x\n", gotgctl);
        dev_dbg(hsotg->dev, "gotgctl.b.conidsts=%d\n",
                !!(gotgctl & GOTGCTL_CONID_B));

        /* B-Device connector (Device Mode) */
        if (gotgctl & GOTGCTL_CONID_B) {
                dwc2_vbus_supply_exit(hsotg);
                /* Wait for switch to device mode */
                dev_dbg(hsotg->dev, "connId B\n");
                if (hsotg->bus_suspended) {
                        dev_info(hsotg->dev,
                                 "Do port resume before switching to device mode\n");
                        dwc2_port_resume(hsotg);
                }
                while (!dwc2_is_device_mode(hsotg)) {
                        dev_info(hsotg->dev,
                                 "Waiting for Peripheral Mode, Mode=%s\n",
                                 dwc2_is_host_mode(hsotg) ? "Host" :
                                 "Peripheral");
                        msleep(20);
                        /*
                         * Sometimes the initial GOTGCTRL read is wrong, so
                         * check it again and jump to host mode if that was
                         * the case.
                         */
                        gotgctl = dwc2_readl(hsotg, GOTGCTL);
                        if (!(gotgctl & GOTGCTL_CONID_B))
                                goto host;
                        if (++count > 250)
                                break;
                }
                if (count > 250)
                        dev_err(hsotg->dev,
                                "Connection id status change timed out\n");

                /*
                 * Exit Partial Power Down without restoring registers.
                 * No need to check the return value as registers
                 * are not being restored.
                 */
                if (hsotg->in_ppd && hsotg->lx_state == DWC2_L2)
                        dwc2_exit_partial_power_down(hsotg, 0, false);

                hsotg->op_state = OTG_STATE_B_PERIPHERAL;
                dwc2_core_init(hsotg, false);
                dwc2_enable_global_interrupts(hsotg);
                spin_lock_irqsave(&hsotg->lock, flags);
                dwc2_hsotg_core_init_disconnected(hsotg, false);
                spin_unlock_irqrestore(&hsotg->lock, flags);
                /* Enable ACG feature in device mode,if supported */
                dwc2_enable_acg(hsotg);
                dwc2_hsotg_core_connect(hsotg);
        } else {
host:
                /* A-Device connector (Host Mode) */
                dev_dbg(hsotg->dev, "connId A\n");
                while (!dwc2_is_host_mode(hsotg)) {
                        dev_info(hsotg->dev, "Waiting for Host Mode, Mode=%s\n",
                                 dwc2_is_host_mode(hsotg) ?
                                 "Host" : "Peripheral");
                        msleep(20);
                        if (++count > 250)
                                break;
                }
                if (count > 250)
                        dev_err(hsotg->dev,
                                "Connection id status change timed out\n");

                spin_lock_irqsave(&hsotg->lock, flags);
                dwc2_hsotg_disconnect(hsotg);
                spin_unlock_irqrestore(&hsotg->lock, flags);

                hsotg->op_state = OTG_STATE_A_HOST;
                /* Initialize the Core for Host mode */
                dwc2_core_init(hsotg, false);
                dwc2_enable_global_interrupts(hsotg);
                dwc2_hcd_start(hsotg);
        }
}

static void dwc2_wakeup_detected(struct timer_list *t)
{
        struct dwc2_hsotg *hsotg = timer_container_of(hsotg, t, wkp_timer);
        u32 hprt0;

        dev_dbg(hsotg->dev, "%s()\n", __func__);

        /*
         * Clear the Resume after 70ms. (Need 20 ms minimum. Use 70 ms
         * so that OPT tests pass with all PHYs.)
         */
        hprt0 = dwc2_read_hprt0(hsotg);
        dev_dbg(hsotg->dev, "Resume: HPRT0=%0x\n", hprt0);
        hprt0 &= ~HPRT0_RES;
        dwc2_writel(hsotg, hprt0, HPRT0);
        dev_dbg(hsotg->dev, "Clear Resume: HPRT0=%0x\n",
                dwc2_readl(hsotg, HPRT0));

        dwc2_hcd_rem_wakeup(hsotg);
        hsotg->bus_suspended = false;

        /* Change to L0 state */
        hsotg->lx_state = DWC2_L0;
}

static int dwc2_host_is_b_hnp_enabled(struct dwc2_hsotg *hsotg)
{
        struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg);

        return hcd->self.b_hnp_enable;
}

/**
 * dwc2_port_suspend() - Put controller in suspend mode for host.
 *
 * @hsotg: Programming view of the DWC_otg controller
 * @windex: The control request wIndex field
 *
 * Return: non-zero if failed to enter suspend mode for host.
 *
 * This function is for entering Host mode suspend.
 * Must NOT be called with interrupt disabled or spinlock held.
 */
int dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
{
        unsigned long flags;
        u32 pcgctl;
        u32 gotgctl;
        int ret = 0;

        dev_dbg(hsotg->dev, "%s()\n", __func__);

        spin_lock_irqsave(&hsotg->lock, flags);

        if (windex == hsotg->otg_port && dwc2_host_is_b_hnp_enabled(hsotg)) {
                gotgctl = dwc2_readl(hsotg, GOTGCTL);
                gotgctl |= GOTGCTL_HSTSETHNPEN;
                dwc2_writel(hsotg, gotgctl, GOTGCTL);
                hsotg->op_state = OTG_STATE_A_SUSPEND;
        }

        switch (hsotg->params.power_down) {
        case DWC2_POWER_DOWN_PARAM_PARTIAL:
                ret = dwc2_enter_partial_power_down(hsotg);
                if (ret)
                        dev_err(hsotg->dev,
                                "enter partial_power_down failed.\n");
                break;
        case DWC2_POWER_DOWN_PARAM_HIBERNATION:
                /*
                 * Perform spin unlock and lock because in
                 * "dwc2_host_enter_hibernation()" function there is a spinlock
                 * logic which prevents servicing of any IRQ during entering
                 * hibernation.
                 */
                spin_unlock_irqrestore(&hsotg->lock, flags);
                ret = dwc2_enter_hibernation(hsotg, 1);
                if (ret)
                        dev_err(hsotg->dev, "enter hibernation failed.\n");
                spin_lock_irqsave(&hsotg->lock, flags);
                break;
        case DWC2_POWER_DOWN_PARAM_NONE:
                /*
                 * If not hibernation nor partial power down are supported,
                 * clock gating is used to save power.
                 */
                if (!hsotg->params.no_clock_gating)
                        dwc2_host_enter_clock_gating(hsotg);
                break;
        }

        /* For HNP the bus must be suspended for at least 200ms */
        if (dwc2_host_is_b_hnp_enabled(hsotg)) {
                pcgctl = dwc2_readl(hsotg, PCGCTL);
                pcgctl &= ~PCGCTL_STOPPCLK;
                dwc2_writel(hsotg, pcgctl, PCGCTL);

                spin_unlock_irqrestore(&hsotg->lock, flags);

                msleep(200);
        } else {
                spin_unlock_irqrestore(&hsotg->lock, flags);
        }

        return ret;
}

/**
 * dwc2_port_resume() - Exit controller from suspend mode for host.
 *
 * @hsotg: Programming view of the DWC_otg controller
 *
 * Return: non-zero if failed to exit suspend mode for host.
 *
 * This function is for exiting Host mode suspend.
 * Must NOT be called with interrupt disabled or spinlock held.
 */
int dwc2_port_resume(struct dwc2_hsotg *hsotg)
{
        unsigned long flags;
        int ret = 0;

        spin_lock_irqsave(&hsotg->lock, flags);

        switch (hsotg->params.power_down) {
        case DWC2_POWER_DOWN_PARAM_PARTIAL:
                ret = dwc2_exit_partial_power_down(hsotg, 0, true);
                if (ret)
                        dev_err(hsotg->dev,
                                "exit partial_power_down failed.\n");
                break;
        case DWC2_POWER_DOWN_PARAM_HIBERNATION:
                /* Exit host hibernation. */
                ret = dwc2_exit_hibernation(hsotg, 0, 0, 1);
                if (ret)
                        dev_err(hsotg->dev, "exit hibernation failed.\n");
                break;
        case DWC2_POWER_DOWN_PARAM_NONE:
                /*
                 * If not hibernation nor partial power down are supported,
                 * port resume is done using the clock gating programming flow.
                 */
                spin_unlock_irqrestore(&hsotg->lock, flags);
                dwc2_host_exit_clock_gating(hsotg, 0);
                spin_lock_irqsave(&hsotg->lock, flags);
                break;
        }

        spin_unlock_irqrestore(&hsotg->lock, flags);

        return ret;
}

/* Handles hub class-specific requests */
static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, u16 typereq,
                                u16 wvalue, u16 windex, char *buf, u16 wlength)
{
        struct usb_hub_descriptor *hub_desc;
        int retval = 0;
        u32 hprt0;
        u32 port_status;
        u32 speed;
        u32 pcgctl;
        u32 pwr;

        switch (typereq) {
        case ClearHubFeature:
                dev_dbg(hsotg->dev, "ClearHubFeature %1xh\n", wvalue);

                switch (wvalue) {
                case C_HUB_LOCAL_POWER:
                case C_HUB_OVER_CURRENT:
                        /* Nothing required here */
                        break;

                default:
                        retval = -EINVAL;
                        dev_err(hsotg->dev,
                                "ClearHubFeature request %1xh unknown\n",
                                wvalue);
                }
                break;

        case ClearPortFeature:
                if (wvalue != USB_PORT_FEAT_L1)
                        if (!windex || windex > 1)
                                goto error;
                switch (wvalue) {
                case USB_PORT_FEAT_ENABLE:
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_ENABLE\n");
                        hprt0 = dwc2_read_hprt0(hsotg);
                        hprt0 |= HPRT0_ENA;
                        dwc2_writel(hsotg, hprt0, HPRT0);
                        break;

                case USB_PORT_FEAT_SUSPEND:
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_SUSPEND\n");

                        if (hsotg->bus_suspended)
                                retval = dwc2_port_resume(hsotg);
                        break;

                case USB_PORT_FEAT_POWER:
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_POWER\n");
                        hprt0 = dwc2_read_hprt0(hsotg);
                        pwr = hprt0 & HPRT0_PWR;
                        hprt0 &= ~HPRT0_PWR;
                        dwc2_writel(hsotg, hprt0, HPRT0);
                        if (pwr)
                                dwc2_vbus_supply_exit(hsotg);
                        break;

                case USB_PORT_FEAT_INDICATOR:
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_INDICATOR\n");
                        /* Port indicator not supported */
                        break;

                case USB_PORT_FEAT_C_CONNECTION:
                        /*
                         * Clears driver's internal Connect Status Change flag
                         */
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_C_CONNECTION\n");
                        hsotg->flags.b.port_connect_status_change = 0;
                        break;

                case USB_PORT_FEAT_C_RESET:
                        /* Clears driver's internal Port Reset Change flag */
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_C_RESET\n");
                        hsotg->flags.b.port_reset_change = 0;
                        break;

                case USB_PORT_FEAT_C_ENABLE:
                        /*
                         * Clears the driver's internal Port Enable/Disable
                         * Change flag
                         */
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_C_ENABLE\n");
                        hsotg->flags.b.port_enable_change = 0;
                        break;

                case USB_PORT_FEAT_C_SUSPEND:
                        /*
                         * Clears the driver's internal Port Suspend Change
                         * flag, which is set when resume signaling on the host
                         * port is complete
                         */
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_C_SUSPEND\n");
                        hsotg->flags.b.port_suspend_change = 0;
                        break;

                case USB_PORT_FEAT_C_PORT_L1:
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_C_PORT_L1\n");
                        hsotg->flags.b.port_l1_change = 0;
                        break;

                case USB_PORT_FEAT_C_OVER_CURRENT:
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_C_OVER_CURRENT\n");
                        hsotg->flags.b.port_over_current_change = 0;
                        break;

                default:
                        retval = -EINVAL;
                        dev_err(hsotg->dev,
                                "ClearPortFeature request %1xh unknown or unsupported\n",
                                wvalue);
                }
                break;

        case GetHubDescriptor:
                dev_dbg(hsotg->dev, "GetHubDescriptor\n");
                hub_desc = (struct usb_hub_descriptor *)buf;
                hub_desc->bDescLength = 9;
                hub_desc->bDescriptorType = USB_DT_HUB;
                hub_desc->bNbrPorts = 1;
                hub_desc->wHubCharacteristics =
                        cpu_to_le16(HUB_CHAR_COMMON_LPSM |
                                    HUB_CHAR_INDV_PORT_OCPM);
                hub_desc->bPwrOn2PwrGood = 1;
                hub_desc->bHubContrCurrent = 0;
                hub_desc->u.hs.DeviceRemovable[0] = 0;
                hub_desc->u.hs.DeviceRemovable[1] = 0xff;
                break;

        case GetHubStatus:
                dev_dbg(hsotg->dev, "GetHubStatus\n");
                memset(buf, 0, 4);
                break;

        case GetPortStatus:
                dev_vdbg(hsotg->dev,
                         "GetPortStatus wIndex=0x%04x flags=0x%08x\n", windex,
                         hsotg->flags.d32);
                if (!windex || windex > 1)
                        goto error;

                port_status = 0;
                if (hsotg->flags.b.port_connect_status_change)
                        port_status |= USB_PORT_STAT_C_CONNECTION << 16;
                if (hsotg->flags.b.port_enable_change)
                        port_status |= USB_PORT_STAT_C_ENABLE << 16;
                if (hsotg->flags.b.port_suspend_change)
                        port_status |= USB_PORT_STAT_C_SUSPEND << 16;
                if (hsotg->flags.b.port_l1_change)
                        port_status |= USB_PORT_STAT_C_L1 << 16;
                if (hsotg->flags.b.port_reset_change)
                        port_status |= USB_PORT_STAT_C_RESET << 16;
                if (hsotg->flags.b.port_over_current_change) {
                        dev_warn(hsotg->dev, "Overcurrent change detected\n");
                        port_status |= USB_PORT_STAT_C_OVERCURRENT << 16;
                }

                if (dwc2_is_device_mode(hsotg)) {
                        /*
                         * Just return 0's for the remainder of the port status
                         * since the port register can't be read if the core
                         * is in device mode.
                         */
                        *(__le32 *)buf = cpu_to_le32(port_status);
                        break;
                }

                hprt0 = dwc2_readl(hsotg, HPRT0);
                dev_vdbg(hsotg->dev, "  HPRT0: 0x%08x\n", hprt0);

                if (hprt0 & HPRT0_CONNSTS)
                        port_status |= USB_PORT_STAT_CONNECTION;
                if (hprt0 & HPRT0_ENA)
                        port_status |= USB_PORT_STAT_ENABLE;
                if (hprt0 & HPRT0_SUSP)
                        port_status |= USB_PORT_STAT_SUSPEND;
                if (hprt0 & HPRT0_OVRCURRACT)
                        port_status |= USB_PORT_STAT_OVERCURRENT;
                if (hprt0 & HPRT0_RST)
                        port_status |= USB_PORT_STAT_RESET;
                if (hprt0 & HPRT0_PWR)
                        port_status |= USB_PORT_STAT_POWER;

                speed = (hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT;
                if (speed == HPRT0_SPD_HIGH_SPEED)
                        port_status |= USB_PORT_STAT_HIGH_SPEED;
                else if (speed == HPRT0_SPD_LOW_SPEED)
                        port_status |= USB_PORT_STAT_LOW_SPEED;

                if (hprt0 & HPRT0_TSTCTL_MASK)
                        port_status |= USB_PORT_STAT_TEST;
                /* USB_PORT_FEAT_INDICATOR unsupported always 0 */

                if (hsotg->params.dma_desc_fs_enable) {
                        /*
                         * Enable descriptor DMA only if a full speed
                         * device is connected.
                         */
                        if (hsotg->new_connection &&
                            ((port_status &
                              (USB_PORT_STAT_CONNECTION |
                               USB_PORT_STAT_HIGH_SPEED |
                               USB_PORT_STAT_LOW_SPEED)) ==
                               USB_PORT_STAT_CONNECTION)) {
                                u32 hcfg;

                                dev_info(hsotg->dev, "Enabling descriptor DMA mode\n");
                                hsotg->params.dma_desc_enable = true;
                                hcfg = dwc2_readl(hsotg, HCFG);
                                hcfg |= HCFG_DESCDMA;
                                dwc2_writel(hsotg, hcfg, HCFG);
                                hsotg->new_connection = false;
                        }
                }

                dev_vdbg(hsotg->dev, "port_status=%08x\n", port_status);
                *(__le32 *)buf = cpu_to_le32(port_status);
                break;

        case SetHubFeature:
                dev_dbg(hsotg->dev, "SetHubFeature\n");
                /* No HUB features supported */
                break;

        case SetPortFeature:
                dev_dbg(hsotg->dev, "SetPortFeature\n");
                if (wvalue != USB_PORT_FEAT_TEST && (!windex || windex > 1))
                        goto error;

                if (dwc2_is_device_mode(hsotg)) {
                        /*
                         * Just return 0's for the remainder of the port status
                         * since the port register can't be read if the core
                         * is in device mode.
                         */
                        break;
                }

                switch (wvalue) {
                case USB_PORT_FEAT_SUSPEND:
                        dev_dbg(hsotg->dev,
                                "SetPortFeature - USB_PORT_FEAT_SUSPEND\n");
                        if (windex != hsotg->otg_port)
                                goto error;
                        if (!hsotg->bus_suspended)
                                retval = dwc2_port_suspend(hsotg, windex);
                        break;

                case USB_PORT_FEAT_POWER:
                        dev_dbg(hsotg->dev,
                                "SetPortFeature - USB_PORT_FEAT_POWER\n");
                        hprt0 = dwc2_read_hprt0(hsotg);
                        pwr = hprt0 & HPRT0_PWR;
                        hprt0 |= HPRT0_PWR;
                        dwc2_writel(hsotg, hprt0, HPRT0);
                        if (!pwr)
                                dwc2_vbus_supply_init(hsotg);
                        break;

                case USB_PORT_FEAT_RESET:
                        dev_dbg(hsotg->dev,
                                "SetPortFeature - USB_PORT_FEAT_RESET\n");

                        hprt0 = dwc2_read_hprt0(hsotg);

                        if (hsotg->hibernated) {
                                retval = dwc2_exit_hibernation(hsotg, 0, 1, 1);
                                if (retval)
                                        dev_err(hsotg->dev,
                                                "exit hibernation failed\n");
                        }

                        if (hsotg->in_ppd) {
                                retval = dwc2_exit_partial_power_down(hsotg, 1,
                                                                      true);
                                if (retval)
                                        dev_err(hsotg->dev,
                                                "exit partial_power_down failed\n");
                        }

                        if (hsotg->params.power_down ==
                            DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended)
                                dwc2_host_exit_clock_gating(hsotg, 0);

                        pcgctl = dwc2_readl(hsotg, PCGCTL);
                        pcgctl &= ~(PCGCTL_ENBL_SLEEP_GATING | PCGCTL_STOPPCLK);
                        dwc2_writel(hsotg, pcgctl, PCGCTL);
                        /* ??? Original driver does this */
                        dwc2_writel(hsotg, 0, PCGCTL);

                        hprt0 = dwc2_read_hprt0(hsotg);
                        pwr = hprt0 & HPRT0_PWR;
                        /* Clear suspend bit if resetting from suspend state */
                        hprt0 &= ~HPRT0_SUSP;

                        /*
                         * When B-Host the Port reset bit is set in the Start
                         * HCD Callback function, so that the reset is started
                         * within 1ms of the HNP success interrupt
                         */
                        if (!dwc2_hcd_is_b_host(hsotg)) {
                                hprt0 |= HPRT0_PWR | HPRT0_RST;
                                dev_dbg(hsotg->dev,
                                        "In host mode, hprt0=%08x\n", hprt0);
                                dwc2_writel(hsotg, hprt0, HPRT0);
                                if (!pwr)
                                        dwc2_vbus_supply_init(hsotg);
                        }

                        /* Clear reset bit in 10ms (FS/LS) or 50ms (HS) */
                        msleep(50);
                        hprt0 &= ~HPRT0_RST;
                        dwc2_writel(hsotg, hprt0, HPRT0);
                        hsotg->lx_state = DWC2_L0; /* Now back to On state */
                        break;

                case USB_PORT_FEAT_INDICATOR:
                        dev_dbg(hsotg->dev,
                                "SetPortFeature - USB_PORT_FEAT_INDICATOR\n");
                        /* Not supported */
                        break;

                case USB_PORT_FEAT_TEST:
                        hprt0 = dwc2_read_hprt0(hsotg);
                        dev_dbg(hsotg->dev,
                                "SetPortFeature - USB_PORT_FEAT_TEST\n");
                        hprt0 &= ~HPRT0_TSTCTL_MASK;
                        hprt0 |= (windex >> 8) << HPRT0_TSTCTL_SHIFT;
                        dwc2_writel(hsotg, hprt0, HPRT0);
                        break;

                default:
                        retval = -EINVAL;
                        dev_err(hsotg->dev,
                                "SetPortFeature %1xh unknown or unsupported\n",
                                wvalue);
                        break;
                }
                break;

        default:
error:
                retval = -EINVAL;
                dev_dbg(hsotg->dev,
                        "Unknown hub control request: %1xh wIndex: %1xh wValue: %1xh\n",
                        typereq, windex, wvalue);
                break;
        }

        return retval;
}

static int dwc2_hcd_is_status_changed(struct dwc2_hsotg *hsotg, int port)
{
        int retval;

        if (port != 1)
                return -EINVAL;

        retval = (hsotg->flags.b.port_connect_status_change ||
                  hsotg->flags.b.port_reset_change ||
                  hsotg->flags.b.port_enable_change ||
                  hsotg->flags.b.port_suspend_change ||
                  hsotg->flags.b.port_over_current_change);

        if (retval) {
                dev_dbg(hsotg->dev,
                        "DWC OTG HCD HUB STATUS DATA: Root port status changed\n");
                dev_dbg(hsotg->dev, "  port_connect_status_change: %d\n",
                        hsotg->flags.b.port_connect_status_change);
                dev_dbg(hsotg->dev, "  port_reset_change: %d\n",
                        hsotg->flags.b.port_reset_change);
                dev_dbg(hsotg->dev, "  port_enable_change: %d\n",
                        hsotg->flags.b.port_enable_change);
                dev_dbg(hsotg->dev, "  port_suspend_change: %d\n",
                        hsotg->flags.b.port_suspend_change);
                dev_dbg(hsotg->dev, "  port_over_current_change: %d\n",
                        hsotg->flags.b.port_over_current_change);
        }

        return retval;
}

int dwc2_hcd_get_frame_number(struct dwc2_hsotg *hsotg)
{
        u32 hfnum = dwc2_readl(hsotg, HFNUM);

#ifdef DWC2_DEBUG_SOF
        dev_vdbg(hsotg->dev, "DWC OTG HCD GET FRAME NUMBER %d\n",
                 (hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT);
#endif
        return (hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT;
}

int dwc2_hcd_get_future_frame_number(struct dwc2_hsotg *hsotg, int us)
{
        u32 hprt = dwc2_readl(hsotg, HPRT0);
        u32 hfir = dwc2_readl(hsotg, HFIR);
        u32 hfnum = dwc2_readl(hsotg, HFNUM);
        unsigned int us_per_frame;
        unsigned int frame_number;
        unsigned int remaining;
        unsigned int interval;
        unsigned int phy_clks;

        /* High speed has 125 us per (micro) frame; others are 1 ms per */
        us_per_frame = (hprt & HPRT0_SPD_MASK) ? 1000 : 125;

        /* Extract fields */
        frame_number = (hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT;
        remaining = (hfnum & HFNUM_FRREM_MASK) >> HFNUM_FRREM_SHIFT;
        interval = (hfir & HFIR_FRINT_MASK) >> HFIR_FRINT_SHIFT;

        /*
         * Number of phy clocks since the last tick of the frame number after
         * "us" has passed.
         */
        phy_clks = (interval - remaining) +
                   DIV_ROUND_UP(interval * us, us_per_frame);

        return dwc2_frame_num_inc(frame_number, phy_clks / interval);
}

int dwc2_hcd_is_b_host(struct dwc2_hsotg *hsotg)
{
        return hsotg->op_state == OTG_STATE_B_HOST;
}

static struct dwc2_hcd_urb *dwc2_hcd_urb_alloc(struct dwc2_hsotg *hsotg,
                                               int iso_desc_count,
                                               gfp_t mem_flags)
{
        struct dwc2_hcd_urb *urb;

        urb = kzalloc_flex(*urb, iso_descs, iso_desc_count, mem_flags);
        if (urb)
                urb->packet_count = iso_desc_count;
        return urb;
}

static void dwc2_hcd_urb_set_pipeinfo(struct dwc2_hsotg *hsotg,
                                      struct dwc2_hcd_urb *urb, u8 dev_addr,
                                      u8 ep_num, u8 ep_type, u8 ep_dir,
                                      u16 maxp, u16 maxp_mult)
{
        if (dbg_perio() ||
            ep_type == USB_ENDPOINT_XFER_BULK ||
            ep_type == USB_ENDPOINT_XFER_CONTROL)
                dev_vdbg(hsotg->dev,
                         "addr=%d, ep_num=%d, ep_dir=%1x, ep_type=%1x, maxp=%d (%d mult)\n",
                         dev_addr, ep_num, ep_dir, ep_type, maxp, maxp_mult);
        urb->pipe_info.dev_addr = dev_addr;
        urb->pipe_info.ep_num = ep_num;
        urb->pipe_info.pipe_type = ep_type;
        urb->pipe_info.pipe_dir = ep_dir;
        urb->pipe_info.maxp = maxp;
        urb->pipe_info.maxp_mult = maxp_mult;
}

/*
 * NOTE: This function will be removed once the peripheral controller code
 * is integrated and the driver is stable
 */
void dwc2_hcd_dump_state(struct dwc2_hsotg *hsotg)
{
#ifdef DEBUG
        struct dwc2_host_chan *chan;
        struct dwc2_hcd_urb *urb;
        struct dwc2_qtd *qtd;
        int num_channels;
        u32 np_tx_status;
        u32 p_tx_status;
        int i;

        num_channels = hsotg->params.host_channels;
        dev_dbg(hsotg->dev, "\n");
        dev_dbg(hsotg->dev,
                "************************************************************\n");
        dev_dbg(hsotg->dev, "HCD State:\n");
        dev_dbg(hsotg->dev, "  Num channels: %d\n", num_channels);

        for (i = 0; i < num_channels; i++) {
                chan = hsotg->hc_ptr_array[i];
                dev_dbg(hsotg->dev, "  Channel %d:\n", i);
                dev_dbg(hsotg->dev,
                        "    dev_addr: %d, ep_num: %d, ep_is_in: %d\n",
                        chan->dev_addr, chan->ep_num, chan->ep_is_in);
                dev_dbg(hsotg->dev, "    speed: %d\n", chan->speed);
                dev_dbg(hsotg->dev, "    ep_type: %d\n", chan->ep_type);
                dev_dbg(hsotg->dev, "    max_packet: %d\n", chan->max_packet);
                dev_dbg(hsotg->dev, "    data_pid_start: %d\n",
                        chan->data_pid_start);
                dev_dbg(hsotg->dev, "    multi_count: %d\n", chan->multi_count);
                dev_dbg(hsotg->dev, "    xfer_started: %d\n",
                        chan->xfer_started);
                dev_dbg(hsotg->dev, "    xfer_buf: %p\n", chan->xfer_buf);
                dev_dbg(hsotg->dev, "    xfer_dma: %08lx\n",
                        (unsigned long)chan->xfer_dma);
                dev_dbg(hsotg->dev, "    xfer_len: %d\n", chan->xfer_len);
                dev_dbg(hsotg->dev, "    xfer_count: %d\n", chan->xfer_count);
                dev_dbg(hsotg->dev, "    halt_on_queue: %d\n",
                        chan->halt_on_queue);
                dev_dbg(hsotg->dev, "    halt_pending: %d\n",
                        chan->halt_pending);
                dev_dbg(hsotg->dev, "    halt_status: %d\n", chan->halt_status);
                dev_dbg(hsotg->dev, "    do_split: %d\n", chan->do_split);
                dev_dbg(hsotg->dev, "    complete_split: %d\n",
                        chan->complete_split);
                dev_dbg(hsotg->dev, "    hub_addr: %d\n", chan->hub_addr);
                dev_dbg(hsotg->dev, "    hub_port: %d\n", chan->hub_port);
                dev_dbg(hsotg->dev, "    xact_pos: %d\n", chan->xact_pos);
                dev_dbg(hsotg->dev, "    requests: %d\n", chan->requests);
                dev_dbg(hsotg->dev, "    qh: %p\n", chan->qh);

                if (chan->xfer_started) {
                        u32 hfnum, hcchar, hctsiz, hcint, hcintmsk;

                        hfnum = dwc2_readl(hsotg, HFNUM);
                        hcchar = dwc2_readl(hsotg, HCCHAR(i));
                        hctsiz = dwc2_readl(hsotg, HCTSIZ(i));
                        hcint = dwc2_readl(hsotg, HCINT(i));
                        hcintmsk = dwc2_readl(hsotg, HCINTMSK(i));
                        dev_dbg(hsotg->dev, "    hfnum: 0x%08x\n", hfnum);
                        dev_dbg(hsotg->dev, "    hcchar: 0x%08x\n", hcchar);
                        dev_dbg(hsotg->dev, "    hctsiz: 0x%08x\n", hctsiz);
                        dev_dbg(hsotg->dev, "    hcint: 0x%08x\n", hcint);
                        dev_dbg(hsotg->dev, "    hcintmsk: 0x%08x\n", hcintmsk);
                }

                if (!(chan->xfer_started && chan->qh))
                        continue;

                list_for_each_entry(qtd, &chan->qh->qtd_list, qtd_list_entry) {
                        if (!qtd->in_process)
                                break;
                        urb = qtd->urb;
                        dev_dbg(hsotg->dev, "    URB Info:\n");
                        dev_dbg(hsotg->dev, "      qtd: %p, urb: %p\n",
                                qtd, urb);
                        if (urb) {
                                dev_dbg(hsotg->dev,
                                        "      Dev: %d, EP: %d %s\n",
                                        dwc2_hcd_get_dev_addr(&urb->pipe_info),
                                        dwc2_hcd_get_ep_num(&urb->pipe_info),
                                        dwc2_hcd_is_pipe_in(&urb->pipe_info) ?
                                        "IN" : "OUT");
                                dev_dbg(hsotg->dev,
                                        "      Max packet size: %d (%d mult)\n",
                                        dwc2_hcd_get_maxp(&urb->pipe_info),
                                        dwc2_hcd_get_maxp_mult(&urb->pipe_info));
                                dev_dbg(hsotg->dev,
                                        "      transfer_buffer: %p\n",
                                        urb->buf);
                                dev_dbg(hsotg->dev,
                                        "      transfer_dma: %08lx\n",
                                        (unsigned long)urb->dma);
                                dev_dbg(hsotg->dev,
                                        "      transfer_buffer_length: %d\n",
                                        urb->length);
                                dev_dbg(hsotg->dev, "      actual_length: %d\n",
                                        urb->actual_length);
                        }
                }
        }

        dev_dbg(hsotg->dev, "  non_periodic_channels: %d\n",
                hsotg->non_periodic_channels);
        dev_dbg(hsotg->dev, "  periodic_channels: %d\n",
                hsotg->periodic_channels);
        dev_dbg(hsotg->dev, "  periodic_usecs: %d\n", hsotg->periodic_usecs);
        np_tx_status = dwc2_readl(hsotg, GNPTXSTS);
        dev_dbg(hsotg->dev, "  NP Tx Req Queue Space Avail: %d\n",
                (np_tx_status & TXSTS_QSPCAVAIL_MASK) >> TXSTS_QSPCAVAIL_SHIFT);
        dev_dbg(hsotg->dev, "  NP Tx FIFO Space Avail: %d\n",
                (np_tx_status & TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT);
        p_tx_status = dwc2_readl(hsotg, HPTXSTS);
        dev_dbg(hsotg->dev, "  P Tx Req Queue Space Avail: %d\n",
                (p_tx_status & TXSTS_QSPCAVAIL_MASK) >> TXSTS_QSPCAVAIL_SHIFT);
        dev_dbg(hsotg->dev, "  P Tx FIFO Space Avail: %d\n",
                (p_tx_status & TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT);
        dwc2_dump_global_registers(hsotg);
        dwc2_dump_host_registers(hsotg);
        dev_dbg(hsotg->dev,
                "************************************************************\n");
        dev_dbg(hsotg->dev, "\n");
#endif
}

struct wrapper_priv_data {
        struct dwc2_hsotg *hsotg;
};

/* Gets the dwc2_hsotg from a usb_hcd */
static struct dwc2_hsotg *dwc2_hcd_to_hsotg(struct usb_hcd *hcd)
{
        struct wrapper_priv_data *p;

        p = (struct wrapper_priv_data *)&hcd->hcd_priv;
        return p->hsotg;
}

/**
 * dwc2_host_get_tt_info() - Get the dwc2_tt associated with context
 *
 * This will get the dwc2_tt structure (and ttport) associated with the given
 * context (which is really just a struct urb pointer).
 *
 * The first time this is called for a given TT we allocate memory for our
 * structure.  When everyone is done and has called dwc2_host_put_tt_info()
 * then the refcount for the structure will go to 0 and we'll free it.
 *
 * @hsotg:     The HCD state structure for the DWC OTG controller.
 * @context:   The priv pointer from a struct dwc2_hcd_urb.
 * @mem_flags: Flags for allocating memory.
 * @ttport:    We'll return this device's port number here.  That's used to
 *             reference into the bitmap if we're on a multi_tt hub.
 *
 * Return: a pointer to a struct dwc2_tt.  Don't forget to call
 *         dwc2_host_put_tt_info()!  Returns NULL upon memory alloc failure.
 */

struct dwc2_tt *dwc2_host_get_tt_info(struct dwc2_hsotg *hsotg, void *context,
                                      gfp_t mem_flags, int *ttport)
{
        struct urb *urb = context;
        struct dwc2_tt *dwc_tt = NULL;

        if (urb->dev->tt) {
                *ttport = urb->dev->ttport;

                dwc_tt = urb->dev->tt->hcpriv;
                if (!dwc_tt) {
                        size_t bitmap_size;

                        /*
                         * For single_tt we need one schedule.  For multi_tt
                         * we need one per port.
                         */
                        bitmap_size = DWC2_ELEMENTS_PER_LS_BITMAP *
                                      sizeof(dwc_tt->periodic_bitmaps[0]);
                        if (urb->dev->tt->multi)
                                bitmap_size *= urb->dev->tt->hub->maxchild;

                        dwc_tt = kzalloc(sizeof(*dwc_tt) + bitmap_size,
                                         mem_flags);
                        if (!dwc_tt)
                                return NULL;

                        dwc_tt->usb_tt = urb->dev->tt;
                        dwc_tt->usb_tt->hcpriv = dwc_tt;
                }

                dwc_tt->refcount++;
        }

        return dwc_tt;
}

/**
 * dwc2_host_put_tt_info() - Put the dwc2_tt from dwc2_host_get_tt_info()
 *
 * Frees resources allocated by dwc2_host_get_tt_info() if all current holders
 * of the structure are done.
 *
 * It's OK to call this with NULL.
 *
 * @hsotg:     The HCD state structure for the DWC OTG controller.
 * @dwc_tt:    The pointer returned by dwc2_host_get_tt_info.
 */
void dwc2_host_put_tt_info(struct dwc2_hsotg *hsotg, struct dwc2_tt *dwc_tt)
{
        /* Model kfree and make put of NULL a no-op */
        if (!dwc_tt)
                return;

        WARN_ON(dwc_tt->refcount < 1);

        dwc_tt->refcount--;
        if (!dwc_tt->refcount) {
                dwc_tt->usb_tt->hcpriv = NULL;
                kfree(dwc_tt);
        }
}

int dwc2_host_get_speed(struct dwc2_hsotg *hsotg, void *context)
{
        struct urb *urb = context;

        return urb->dev->speed;
}

static void dwc2_allocate_bus_bandwidth(struct usb_hcd *hcd, u16 bw,
                                        struct urb *urb)
{
        struct usb_bus *bus = hcd_to_bus(hcd);

        if (urb->interval)
                bus->bandwidth_allocated += bw / urb->interval;
        if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
                bus->bandwidth_isoc_reqs++;
        else
                bus->bandwidth_int_reqs++;
}

static void dwc2_free_bus_bandwidth(struct usb_hcd *hcd, u16 bw,
                                    struct urb *urb)
{
        struct usb_bus *bus = hcd_to_bus(hcd);

        if (urb->interval)
                bus->bandwidth_allocated -= bw / urb->interval;
        if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
                bus->bandwidth_isoc_reqs--;
        else
                bus->bandwidth_int_reqs--;
}

/*
 * Sets the final status of an URB and returns it to the upper layer. Any
 * required cleanup of the URB is performed.
 *
 * Must be called with interrupt disabled and spinlock held
 */
void dwc2_host_complete(struct dwc2_hsotg *hsotg, struct dwc2_qtd *qtd,
                        int status)
{
        struct urb *urb;
        int i;

        if (!qtd) {
                dev_dbg(hsotg->dev, "## %s: qtd is NULL ##\n", __func__);
                return;
        }

        if (!qtd->urb) {
                dev_dbg(hsotg->dev, "## %s: qtd->urb is NULL ##\n", __func__);
                return;
        }

        urb = qtd->urb->priv;
        if (!urb) {
                dev_dbg(hsotg->dev, "## %s: urb->priv is NULL ##\n", __func__);
                return;
        }

        urb->actual_length = dwc2_hcd_urb_get_actual_length(qtd->urb);

        if (dbg_urb(urb))
                dev_vdbg(hsotg->dev,
                         "%s: urb %p device %d ep %d-%s status %d actual %d\n",
                         __func__, urb, usb_pipedevice(urb->pipe),
                         usb_pipeendpoint(urb->pipe),
                         usb_pipein(urb->pipe) ? "IN" : "OUT", status,
                         urb->actual_length);

        if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
                if (!hsotg->params.dma_desc_enable)
                        urb->start_frame = qtd->qh->start_active_frame;
                urb->error_count = dwc2_hcd_urb_get_error_count(qtd->urb);
                for (i = 0; i < urb->number_of_packets; ++i) {
                        urb->iso_frame_desc[i].actual_length =
                                dwc2_hcd_urb_get_iso_desc_actual_length(
                                                qtd->urb, i);
                        urb->iso_frame_desc[i].status =
                                dwc2_hcd_urb_get_iso_desc_status(qtd->urb, i);
                }
        }

        if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS && dbg_perio()) {
                for (i = 0; i < urb->number_of_packets; i++)
                        dev_vdbg(hsotg->dev, " ISO Desc %d status %d\n",
                                 i, urb->iso_frame_desc[i].status);
        }

        urb->status = status;
        if (!status) {
                if ((urb->transfer_flags & URB_SHORT_NOT_OK) &&
                    urb->actual_length < urb->transfer_buffer_length)
                        urb->status = -EREMOTEIO;
        }

        if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS ||
            usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
                struct usb_host_endpoint *ep = urb->ep;

                if (ep)
                        dwc2_free_bus_bandwidth(dwc2_hsotg_to_hcd(hsotg),
                                        dwc2_hcd_get_ep_bandwidth(hsotg, ep),
                                        urb);
        }

        usb_hcd_unlink_urb_from_ep(dwc2_hsotg_to_hcd(hsotg), urb);
        urb->hcpriv = NULL;
        kfree(qtd->urb);
        qtd->urb = NULL;

        usb_hcd_giveback_urb(dwc2_hsotg_to_hcd(hsotg), urb, status);
}

/*
 * Work queue function for starting the HCD when A-Cable is connected
 */
static void dwc2_hcd_start_func(struct work_struct *work)
{
        struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg,
                                                start_work.work);

        dev_dbg(hsotg->dev, "%s() %p\n", __func__, hsotg);
        dwc2_host_start(hsotg);
}

/*
 * Reset work queue function
 */
static void dwc2_hcd_reset_func(struct work_struct *work)
{
        struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg,
                                                reset_work.work);
        unsigned long flags;
        u32 hprt0;

        dev_dbg(hsotg->dev, "USB RESET function called\n");

        spin_lock_irqsave(&hsotg->lock, flags);

        hprt0 = dwc2_read_hprt0(hsotg);
        hprt0 &= ~HPRT0_RST;
        dwc2_writel(hsotg, hprt0, HPRT0);
        hsotg->flags.b.port_reset_change = 1;

        spin_unlock_irqrestore(&hsotg->lock, flags);
}

static void dwc2_hcd_phy_reset_func(struct work_struct *work)
{
        struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg,
                                                phy_reset_work);
        int ret;

        ret = phy_reset(hsotg->phy);
        if (ret)
                dev_warn(hsotg->dev, "PHY reset failed\n");
}

/*
 * =========================================================================
 *  Linux HC Driver Functions
 * =========================================================================
 */

/*
 * Initializes the DWC_otg controller and its root hub and prepares it for host
 * mode operation. Activates the root port. Returns 0 on success and a negative
 * error code on failure.
 */
static int _dwc2_hcd_start(struct usb_hcd *hcd)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        struct usb_bus *bus = hcd_to_bus(hcd);
        unsigned long flags;
        u32 hprt0;
        int ret;

        dev_dbg(hsotg->dev, "DWC OTG HCD START\n");

        spin_lock_irqsave(&hsotg->lock, flags);
        hsotg->lx_state = DWC2_L0;
        hcd->state = HC_STATE_RUNNING;
        set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);

        if (dwc2_is_device_mode(hsotg)) {
                spin_unlock_irqrestore(&hsotg->lock, flags);
                return 0;       /* why 0 ?? */
        }

        dwc2_hcd_reinit(hsotg);

        hprt0 = dwc2_read_hprt0(hsotg);
        /* Has vbus power been turned on in dwc2_core_host_init ? */
        if (hprt0 & HPRT0_PWR) {
                /* Enable external vbus supply before resuming root hub */
                spin_unlock_irqrestore(&hsotg->lock, flags);
                ret = dwc2_vbus_supply_init(hsotg);
                if (ret)
                        return ret;
                spin_lock_irqsave(&hsotg->lock, flags);
        }

        /* Initialize and connect root hub if one is not already attached */
        if (bus->root_hub) {
                dev_dbg(hsotg->dev, "DWC OTG HCD Has Root Hub\n");
                /* Inform the HUB driver to resume */
                usb_hcd_resume_root_hub(hcd);
        }

        spin_unlock_irqrestore(&hsotg->lock, flags);

        return 0;
}

/*
 * Halts the DWC_otg host mode operations in a clean manner. USB transfers are
 * stopped.
 */
static void _dwc2_hcd_stop(struct usb_hcd *hcd)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        unsigned long flags;
        u32 hprt0;

        /* Turn off all host-specific interrupts */
        dwc2_disable_host_interrupts(hsotg);

        /* Wait for interrupt processing to finish */
        synchronize_irq(hcd->irq);

        spin_lock_irqsave(&hsotg->lock, flags);
        hprt0 = dwc2_read_hprt0(hsotg);
        /* Ensure hcd is disconnected */
        dwc2_hcd_disconnect(hsotg, true);
        dwc2_hcd_stop(hsotg);
        hsotg->lx_state = DWC2_L3;
        hcd->state = HC_STATE_HALT;
        clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
        spin_unlock_irqrestore(&hsotg->lock, flags);

        /* keep balanced supply init/exit by checking HPRT0_PWR */
        if (hprt0 & HPRT0_PWR)
                dwc2_vbus_supply_exit(hsotg);

        usleep_range(1000, 3000);
}

static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        unsigned long flags;
        int ret = 0;

        spin_lock_irqsave(&hsotg->lock, flags);

        if (dwc2_is_device_mode(hsotg))
                goto unlock;

        if (hsotg->lx_state != DWC2_L0)
                goto unlock;

        if (!HCD_HW_ACCESSIBLE(hcd))
                goto unlock;

        if (hsotg->op_state == OTG_STATE_B_PERIPHERAL)
                goto unlock;

        if (hsotg->bus_suspended)
                goto skip_power_saving;

        if (!(dwc2_read_hprt0(hsotg) & HPRT0_CONNSTS))
                goto skip_power_saving;

        switch (hsotg->params.power_down) {
        case DWC2_POWER_DOWN_PARAM_PARTIAL:
                /* Enter partial_power_down */
                ret = dwc2_enter_partial_power_down(hsotg);
                if (ret)
                        dev_err(hsotg->dev,
                                "enter partial_power_down failed\n");
                /* After entering suspend, hardware is not accessible */
                clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
                break;
        case DWC2_POWER_DOWN_PARAM_HIBERNATION:
                /* Enter hibernation */
                spin_unlock_irqrestore(&hsotg->lock, flags);
                ret = dwc2_enter_hibernation(hsotg, 1);
                if (ret)
                        dev_err(hsotg->dev, "enter hibernation failed\n");
                spin_lock_irqsave(&hsotg->lock, flags);

                /* After entering suspend, hardware is not accessible */
                clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
                break;
        case DWC2_POWER_DOWN_PARAM_NONE:
                /*
                 * If not hibernation nor partial power down are supported,
                 * clock gating is used to save power.
                 */
                if (!hsotg->params.no_clock_gating) {
                        dwc2_host_enter_clock_gating(hsotg);

                        /* After entering suspend, hardware is not accessible */
                        clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
                }
                break;
        default:
                goto skip_power_saving;
        }

        spin_unlock_irqrestore(&hsotg->lock, flags);
        dwc2_vbus_supply_exit(hsotg);
        spin_lock_irqsave(&hsotg->lock, flags);

        /* Ask phy to be suspended */
        if (!IS_ERR_OR_NULL(hsotg->uphy)) {
                spin_unlock_irqrestore(&hsotg->lock, flags);
                usb_phy_set_suspend(hsotg->uphy, true);
                spin_lock_irqsave(&hsotg->lock, flags);
        }

skip_power_saving:
        hsotg->lx_state = DWC2_L2;
unlock:
        spin_unlock_irqrestore(&hsotg->lock, flags);

        return ret;
}

static int _dwc2_hcd_resume(struct usb_hcd *hcd)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        unsigned long flags;
        u32 hprt0;
        int ret = 0;

        spin_lock_irqsave(&hsotg->lock, flags);

        if (dwc2_is_device_mode(hsotg))
                goto unlock;

        if (hsotg->lx_state != DWC2_L2)
                goto unlock;

        hprt0 = dwc2_read_hprt0(hsotg);

        /*
         * Added port connection status checking which prevents exiting from
         * Partial Power Down mode from _dwc2_hcd_resume() if not in Partial
         * Power Down mode.
         */
        if (hprt0 & HPRT0_CONNSTS) {
                set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
                hsotg->lx_state = DWC2_L0;
                goto unlock;
        }

        switch (hsotg->params.power_down) {
        case DWC2_POWER_DOWN_PARAM_PARTIAL:
                ret = dwc2_exit_partial_power_down(hsotg, 0, true);
                if (ret)
                        dev_err(hsotg->dev,
                                "exit partial_power_down failed\n");
                /*
                 * Set HW accessible bit before powering on the controller
                 * since an interrupt may rise.
                 */
                set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
                break;
        case DWC2_POWER_DOWN_PARAM_HIBERNATION:
                ret = dwc2_exit_hibernation(hsotg, 0, 0, 1);
                if (ret)
                        dev_err(hsotg->dev, "exit hibernation failed.\n");

                /*
                 * Set HW accessible bit before powering on the controller
                 * since an interrupt may rise.
                 */
                set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
                break;
        case DWC2_POWER_DOWN_PARAM_NONE:
                /*
                 * If not hibernation nor partial power down are supported,
                 * port resume is done using the clock gating programming flow.
                 */
                spin_unlock_irqrestore(&hsotg->lock, flags);
                dwc2_host_exit_clock_gating(hsotg, 0);

                /*
                 * Initialize the Core for Host mode, as after system resume
                 * the global interrupts are disabled.
                 */
                dwc2_core_init(hsotg, false);
                dwc2_enable_global_interrupts(hsotg);
                dwc2_hcd_reinit(hsotg);
                spin_lock_irqsave(&hsotg->lock, flags);

                /*
                 * Set HW accessible bit before powering on the controller
                 * since an interrupt may rise.
                 */
                set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
                break;
        default:
                hsotg->lx_state = DWC2_L0;
                goto unlock;
        }

        /* Change Root port status, as port status change occurred after resume.*/
        hsotg->flags.b.port_suspend_change = 1;

        /*
         * Enable power if not already done.
         * This must not be spinlocked since duration
         * of this call is unknown.
         */
        if (!IS_ERR_OR_NULL(hsotg->uphy)) {
                spin_unlock_irqrestore(&hsotg->lock, flags);
                usb_phy_set_suspend(hsotg->uphy, false);
                spin_lock_irqsave(&hsotg->lock, flags);
        }

        /* Enable external vbus supply after resuming the port. */
        spin_unlock_irqrestore(&hsotg->lock, flags);
        dwc2_vbus_supply_init(hsotg);

        /* Wait for controller to correctly update D+/D- level */
        usleep_range(3000, 5000);
        spin_lock_irqsave(&hsotg->lock, flags);

        /*
         * Clear Port Enable and Port Status changes.
         * Enable Port Power.
         */
        dwc2_writel(hsotg, HPRT0_PWR | HPRT0_CONNDET |
                        HPRT0_ENACHG, HPRT0);

        /* Wait for controller to detect Port Connect */
        spin_unlock_irqrestore(&hsotg->lock, flags);
        usleep_range(5000, 7000);
        spin_lock_irqsave(&hsotg->lock, flags);
unlock:
        spin_unlock_irqrestore(&hsotg->lock, flags);

        return ret;
}

/* Returns the current frame number */
static int _dwc2_hcd_get_frame_number(struct usb_hcd *hcd)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);

        return dwc2_hcd_get_frame_number(hsotg);
}

static void dwc2_dump_urb_info(struct usb_hcd *hcd, struct urb *urb,
                               char *fn_name)
{
#ifdef VERBOSE_DEBUG
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        char *pipetype = NULL;
        char *speed = NULL;

        dev_vdbg(hsotg->dev, "%s, urb %p\n", fn_name, urb);
        dev_vdbg(hsotg->dev, "  Device address: %d\n",
                 usb_pipedevice(urb->pipe));
        dev_vdbg(hsotg->dev, "  Endpoint: %d, %s\n",
                 usb_pipeendpoint(urb->pipe),
                 usb_pipein(urb->pipe) ? "IN" : "OUT");

        switch (usb_pipetype(urb->pipe)) {
        case PIPE_CONTROL:
                pipetype = "CONTROL";
                break;
        case PIPE_BULK:
                pipetype = "BULK";
                break;
        case PIPE_INTERRUPT:
                pipetype = "INTERRUPT";
                break;
        case PIPE_ISOCHRONOUS:
                pipetype = "ISOCHRONOUS";
                break;
        }

        dev_vdbg(hsotg->dev, "  Endpoint type: %s %s (%s)\n", pipetype,
                 usb_urb_dir_in(urb) ? "IN" : "OUT", usb_pipein(urb->pipe) ?
                 "IN" : "OUT");

        switch (urb->dev->speed) {
        case USB_SPEED_HIGH:
                speed = "HIGH";
                break;
        case USB_SPEED_FULL:
                speed = "FULL";
                break;
        case USB_SPEED_LOW:
                speed = "LOW";
                break;
        default:
                speed = "UNKNOWN";
                break;
        }

        dev_vdbg(hsotg->dev, "  Speed: %s\n", speed);
        dev_vdbg(hsotg->dev, "  Max packet size: %d (%d mult)\n",
                 usb_endpoint_maxp(&urb->ep->desc),
                 usb_endpoint_maxp_mult(&urb->ep->desc));

        dev_vdbg(hsotg->dev, "  Data buffer length: %d\n",
                 urb->transfer_buffer_length);
        dev_vdbg(hsotg->dev, "  Transfer buffer: %p, Transfer DMA: %08lx\n",
                 urb->transfer_buffer, (unsigned long)urb->transfer_dma);
        dev_vdbg(hsotg->dev, "  Setup buffer: %p, Setup DMA: %08lx\n",
                 urb->setup_packet, (unsigned long)urb->setup_dma);
        dev_vdbg(hsotg->dev, "  Interval: %d\n", urb->interval);

        if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
                int i;

                for (i = 0; i < urb->number_of_packets; i++) {
                        dev_vdbg(hsotg->dev, "  ISO Desc %d:\n", i);
                        dev_vdbg(hsotg->dev, "    offset: %d, length %d\n",
                                 urb->iso_frame_desc[i].offset,
                                 urb->iso_frame_desc[i].length);
                }
        }
#endif
}

/*
 * Starts processing a USB transfer request specified by a USB Request Block
 * (URB). mem_flags indicates the type of memory allocation to use while
 * processing this URB.
 */
static int _dwc2_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
                                 gfp_t mem_flags)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        struct usb_host_endpoint *ep = urb->ep;
        struct dwc2_hcd_urb *dwc2_urb;
        int i;
        int retval;
        int alloc_bandwidth = 0;
        u8 ep_type = 0;
        u32 tflags = 0;
        void *buf;
        unsigned long flags;
        struct dwc2_qh *qh;
        bool qh_allocated = false;
        struct dwc2_qtd *qtd;
        struct dwc2_gregs_backup *gr;

        gr = &hsotg->gr_backup;

        if (dbg_urb(urb)) {
                dev_vdbg(hsotg->dev, "DWC OTG HCD URB Enqueue\n");
                dwc2_dump_urb_info(hcd, urb, "urb_enqueue");
        }

        if (hsotg->hibernated) {
                if (gr->gotgctl & GOTGCTL_CURMODE_HOST)
                        retval = dwc2_exit_hibernation(hsotg, 0, 0, 1);
                else
                        retval = dwc2_exit_hibernation(hsotg, 0, 0, 0);

                if (retval)
                        dev_err(hsotg->dev,
                                "exit hibernation failed.\n");
        }

        if (hsotg->in_ppd) {
                retval = dwc2_exit_partial_power_down(hsotg, 0, true);
                if (retval)
                        dev_err(hsotg->dev,
                                "exit partial_power_down failed\n");
        }

        if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_NONE &&
            hsotg->bus_suspended && !hsotg->params.no_clock_gating) {
                if (dwc2_is_device_mode(hsotg))
                        dwc2_gadget_exit_clock_gating(hsotg, 0);
                else
                        dwc2_host_exit_clock_gating(hsotg, 0);
        }

        if (!ep)
                return -EINVAL;

        if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS ||
            usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
                spin_lock_irqsave(&hsotg->lock, flags);
                if (!dwc2_hcd_is_bandwidth_allocated(hsotg, ep))
                        alloc_bandwidth = 1;
                spin_unlock_irqrestore(&hsotg->lock, flags);
        }

        switch (usb_pipetype(urb->pipe)) {
        case PIPE_CONTROL:
                ep_type = USB_ENDPOINT_XFER_CONTROL;
                break;
        case PIPE_ISOCHRONOUS:
                ep_type = USB_ENDPOINT_XFER_ISOC;
                break;
        case PIPE_BULK:
                ep_type = USB_ENDPOINT_XFER_BULK;
                break;
        case PIPE_INTERRUPT:
                ep_type = USB_ENDPOINT_XFER_INT;
                break;
        }

        dwc2_urb = dwc2_hcd_urb_alloc(hsotg, urb->number_of_packets,
                                      mem_flags);
        if (!dwc2_urb)
                return -ENOMEM;

        dwc2_hcd_urb_set_pipeinfo(hsotg, dwc2_urb, usb_pipedevice(urb->pipe),
                                  usb_pipeendpoint(urb->pipe), ep_type,
                                  usb_pipein(urb->pipe),
                                  usb_endpoint_maxp(&ep->desc),
                                  usb_endpoint_maxp_mult(&ep->desc));

        buf = urb->transfer_buffer;

        if (hcd_uses_dma(hcd)) {
                if (!buf && (urb->transfer_dma & 3)) {
                        dev_err(hsotg->dev,
                                "%s: unaligned transfer with no transfer_buffer",
                                __func__);
                        retval = -EINVAL;
                        goto fail0;
                }
        }

        if (!(urb->transfer_flags & URB_NO_INTERRUPT))
                tflags |= URB_GIVEBACK_ASAP;
        if (urb->transfer_flags & URB_ZERO_PACKET)
                tflags |= URB_SEND_ZERO_PACKET;

        dwc2_urb->priv = urb;
        dwc2_urb->buf = buf;
        dwc2_urb->dma = urb->transfer_dma;
        dwc2_urb->length = urb->transfer_buffer_length;
        dwc2_urb->setup_packet = urb->setup_packet;
        dwc2_urb->setup_dma = urb->setup_dma;
        dwc2_urb->flags = tflags;
        dwc2_urb->interval = urb->interval;
        dwc2_urb->status = -EINPROGRESS;

        for (i = 0; i < urb->number_of_packets; ++i)
                dwc2_hcd_urb_set_iso_desc_params(dwc2_urb, i,
                                                 urb->iso_frame_desc[i].offset,
                                                 urb->iso_frame_desc[i].length);

        urb->hcpriv = dwc2_urb;
        qh = (struct dwc2_qh *)ep->hcpriv;
        /* Create QH for the endpoint if it doesn't exist */
        if (!qh) {
                qh = dwc2_hcd_qh_create(hsotg, dwc2_urb, mem_flags);
                if (!qh) {
                        retval = -ENOMEM;
                        goto fail0;
                }
                ep->hcpriv = qh;
                qh_allocated = true;
        }

        qtd = kzalloc_obj(*qtd, mem_flags);
        if (!qtd) {
                retval = -ENOMEM;
                goto fail1;
        }

        spin_lock_irqsave(&hsotg->lock, flags);
        retval = usb_hcd_link_urb_to_ep(hcd, urb);
        if (retval)
                goto fail2;

        retval = dwc2_hcd_urb_enqueue(hsotg, dwc2_urb, qh, qtd);
        if (retval)
                goto fail3;

        if (alloc_bandwidth) {
                dwc2_allocate_bus_bandwidth(hcd,
                                dwc2_hcd_get_ep_bandwidth(hsotg, ep),
                                urb);
        }

        spin_unlock_irqrestore(&hsotg->lock, flags);

        return 0;

fail3:
        dwc2_urb->priv = NULL;
        usb_hcd_unlink_urb_from_ep(hcd, urb);
        if (qh_allocated && qh->channel && qh->channel->qh == qh)
                qh->channel->qh = NULL;
fail2:
        urb->hcpriv = NULL;
        spin_unlock_irqrestore(&hsotg->lock, flags);
        kfree(qtd);
fail1:
        if (qh_allocated) {
                struct dwc2_qtd *qtd2, *qtd2_tmp;

                ep->hcpriv = NULL;
                dwc2_hcd_qh_unlink(hsotg, qh);
                /* Free each QTD in the QH's QTD list */
                list_for_each_entry_safe(qtd2, qtd2_tmp, &qh->qtd_list,
                                         qtd_list_entry)
                        dwc2_hcd_qtd_unlink_and_free(hsotg, qtd2, qh);
                dwc2_hcd_qh_free(hsotg, qh);
        }
fail0:
        kfree(dwc2_urb);

        return retval;
}

/*
 * Aborts/cancels a USB transfer request. Always returns 0 to indicate success.
 */
static int _dwc2_hcd_urb_dequeue(struct usb_hcd *hcd, struct urb *urb,
                                 int status)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        int rc;
        unsigned long flags;

        dev_dbg(hsotg->dev, "DWC OTG HCD URB Dequeue\n");
        dwc2_dump_urb_info(hcd, urb, "urb_dequeue");

        spin_lock_irqsave(&hsotg->lock, flags);

        rc = usb_hcd_check_unlink_urb(hcd, urb, status);
        if (rc)
                goto out;

        if (!urb->hcpriv) {
                dev_dbg(hsotg->dev, "## urb->hcpriv is NULL ##\n");
                goto out;
        }

        rc = dwc2_hcd_urb_dequeue(hsotg, urb->hcpriv);

        usb_hcd_unlink_urb_from_ep(hcd, urb);

        kfree(urb->hcpriv);
        urb->hcpriv = NULL;

        /* Higher layer software sets URB status */
        spin_unlock(&hsotg->lock);
        usb_hcd_giveback_urb(hcd, urb, status);
        spin_lock(&hsotg->lock);

        dev_dbg(hsotg->dev, "Called usb_hcd_giveback_urb()\n");
        dev_dbg(hsotg->dev, "  urb->status = %d\n", urb->status);
out:
        spin_unlock_irqrestore(&hsotg->lock, flags);

        return rc;
}

/*
 * Frees resources in the DWC_otg controller related to a given endpoint. Also
 * clears state in the HCD related to the endpoint. Any URBs for the endpoint
 * must already be dequeued.
 */
static void _dwc2_hcd_endpoint_disable(struct usb_hcd *hcd,
                                       struct usb_host_endpoint *ep)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);

        dev_dbg(hsotg->dev,
                "DWC OTG HCD EP DISABLE: bEndpointAddress=0x%02x, ep->hcpriv=%p\n",
                ep->desc.bEndpointAddress, ep->hcpriv);
        dwc2_hcd_endpoint_disable(hsotg, ep, 250);
}

/*
 * Resets endpoint specific parameter values, in current version used to reset
 * the data toggle (as a WA). This function can be called from usb_clear_halt
 * routine.
 */
static void _dwc2_hcd_endpoint_reset(struct usb_hcd *hcd,
                                     struct usb_host_endpoint *ep)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        unsigned long flags;

        dev_dbg(hsotg->dev,
                "DWC OTG HCD EP RESET: bEndpointAddress=0x%02x\n",
                ep->desc.bEndpointAddress);

        spin_lock_irqsave(&hsotg->lock, flags);
        dwc2_hcd_endpoint_reset(hsotg, ep);
        spin_unlock_irqrestore(&hsotg->lock, flags);
}

/*
 * Handles host mode interrupts for the DWC_otg controller. Returns IRQ_NONE if
 * there was no interrupt to handle. Returns IRQ_HANDLED if there was a valid
 * interrupt.
 *
 * This function is called by the USB core when an interrupt occurs
 */
static irqreturn_t _dwc2_hcd_irq(struct usb_hcd *hcd)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);

        return dwc2_handle_hcd_intr(hsotg);
}

/*
 * Creates Status Change bitmap for the root hub and root port. The bitmap is
 * returned in buf. Bit 0 is the status change indicator for the root hub. Bit 1
 * is the status change indicator for the single root port. Returns 1 if either
 * change indicator is 1, otherwise returns 0.
 */
static int _dwc2_hcd_hub_status_data(struct usb_hcd *hcd, char *buf)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);

        buf[0] = dwc2_hcd_is_status_changed(hsotg, 1) << 1;
        return buf[0] != 0;
}

/* Handles hub class-specific requests */
static int _dwc2_hcd_hub_control(struct usb_hcd *hcd, u16 typereq, u16 wvalue,
                                 u16 windex, char *buf, u16 wlength)
{
        int retval = dwc2_hcd_hub_control(dwc2_hcd_to_hsotg(hcd), typereq,
                                          wvalue, windex, buf, wlength);
        return retval;
}

/* Handles hub TT buffer clear completions */
static void _dwc2_hcd_clear_tt_buffer_complete(struct usb_hcd *hcd,
                                               struct usb_host_endpoint *ep)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        struct dwc2_qh *qh;
        unsigned long flags;

        qh = ep->hcpriv;
        if (!qh)
                return;

        spin_lock_irqsave(&hsotg->lock, flags);
        qh->tt_buffer_dirty = 0;

        if (hsotg->flags.b.port_connect_status)
                dwc2_hcd_queue_transactions(hsotg, DWC2_TRANSACTION_ALL);

        spin_unlock_irqrestore(&hsotg->lock, flags);
}

/*
 * HPRT0_SPD_HIGH_SPEED: high speed
 * HPRT0_SPD_FULL_SPEED: full speed
 */
static void dwc2_change_bus_speed(struct usb_hcd *hcd, int speed)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);

        if (hsotg->params.speed == speed)
                return;

        hsotg->params.speed = speed;
        queue_work(hsotg->wq_otg, &hsotg->wf_otg);
}

static void dwc2_free_dev(struct usb_hcd *hcd, struct usb_device *udev)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);

        if (!hsotg->params.change_speed_quirk)
                return;

        /*
         * On removal, set speed to default high-speed.
         */
        if (udev->parent && udev->parent->speed > USB_SPEED_UNKNOWN &&
            udev->parent->speed < USB_SPEED_HIGH) {
                dev_info(hsotg->dev, "Set speed to default high-speed\n");
                dwc2_change_bus_speed(hcd, HPRT0_SPD_HIGH_SPEED);
        }
}

static int dwc2_reset_device(struct usb_hcd *hcd, struct usb_device *udev)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);

        if (!hsotg->params.change_speed_quirk)
                return 0;

        if (udev->speed == USB_SPEED_HIGH) {
                dev_info(hsotg->dev, "Set speed to high-speed\n");
                dwc2_change_bus_speed(hcd, HPRT0_SPD_HIGH_SPEED);
        } else if ((udev->speed == USB_SPEED_FULL ||
                                udev->speed == USB_SPEED_LOW)) {
                /*
                 * Change speed setting to full-speed if there's
                 * a full-speed or low-speed device plugged in.
                 */
                dev_info(hsotg->dev, "Set speed to full-speed\n");
                dwc2_change_bus_speed(hcd, HPRT0_SPD_FULL_SPEED);
        }

        return 0;
}

static struct hc_driver dwc2_hc_driver = {
        .description = "dwc2_hsotg",
        .product_desc = "DWC OTG Controller",
        .hcd_priv_size = sizeof(struct wrapper_priv_data),

        .irq = _dwc2_hcd_irq,
        .flags = HCD_MEMORY | HCD_USB2 | HCD_BH,

        .start = _dwc2_hcd_start,
        .stop = _dwc2_hcd_stop,
        .urb_enqueue = _dwc2_hcd_urb_enqueue,
        .urb_dequeue = _dwc2_hcd_urb_dequeue,
        .endpoint_disable = _dwc2_hcd_endpoint_disable,
        .endpoint_reset = _dwc2_hcd_endpoint_reset,
        .get_frame_number = _dwc2_hcd_get_frame_number,

        .hub_status_data = _dwc2_hcd_hub_status_data,
        .hub_control = _dwc2_hcd_hub_control,
        .clear_tt_buffer_complete = _dwc2_hcd_clear_tt_buffer_complete,

        .bus_suspend = _dwc2_hcd_suspend,
        .bus_resume = _dwc2_hcd_resume,

        .map_urb_for_dma        = dwc2_map_urb_for_dma,
        .unmap_urb_for_dma      = dwc2_unmap_urb_for_dma,
};

/*
 * Frees secondary storage associated with the dwc2_hsotg structure contained
 * in the struct usb_hcd field
 */
static void dwc2_hcd_free(struct dwc2_hsotg *hsotg)
{
        u32 ahbcfg;
        u32 dctl;
        int i;

        dev_dbg(hsotg->dev, "DWC OTG HCD FREE\n");

        /* Free memory for QH/QTD lists */
        dwc2_qh_list_free(hsotg, &hsotg->non_periodic_sched_inactive);
        dwc2_qh_list_free(hsotg, &hsotg->non_periodic_sched_waiting);
        dwc2_qh_list_free(hsotg, &hsotg->non_periodic_sched_active);
        dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_inactive);
        dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_ready);
        dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_assigned);
        dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_queued);

        /* Free memory for the host channels */
        for (i = 0; i < MAX_EPS_CHANNELS; i++) {
                struct dwc2_host_chan *chan = hsotg->hc_ptr_array[i];

                if (chan) {
                        dev_dbg(hsotg->dev, "HCD Free channel #%i, chan=%p\n",
                                i, chan);
                        hsotg->hc_ptr_array[i] = NULL;
                        kfree(chan);
                }
        }

        if (hsotg->params.host_dma) {
                if (hsotg->status_buf) {
                        dma_free_coherent(hsotg->dev, DWC2_HCD_STATUS_BUF_SIZE,
                                          hsotg->status_buf,
                                          hsotg->status_buf_dma);
                        hsotg->status_buf = NULL;
                }
        } else {
                kfree(hsotg->status_buf);
                hsotg->status_buf = NULL;
        }

        ahbcfg = dwc2_readl(hsotg, GAHBCFG);

        /* Disable all interrupts */
        ahbcfg &= ~GAHBCFG_GLBL_INTR_EN;
        dwc2_writel(hsotg, ahbcfg, GAHBCFG);
        dwc2_writel(hsotg, 0, GINTMSK);

        if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_3_00a) {
                dctl = dwc2_readl(hsotg, DCTL);
                dctl |= DCTL_SFTDISCON;
                dwc2_writel(hsotg, dctl, DCTL);
        }

        if (hsotg->wq_otg) {
                if (!cancel_work_sync(&hsotg->wf_otg))
                        flush_workqueue(hsotg->wq_otg);
                destroy_workqueue(hsotg->wq_otg);
        }

        cancel_work_sync(&hsotg->phy_reset_work);

        timer_delete(&hsotg->wkp_timer);
}

static void dwc2_hcd_release(struct dwc2_hsotg *hsotg)
{
        /* Turn off all host-specific interrupts */
        dwc2_disable_host_interrupts(hsotg);

        dwc2_hcd_free(hsotg);
}

/*
 * Initializes the HCD. This function allocates memory for and initializes the
 * static parts of the usb_hcd and dwc2_hsotg structures. It also registers the
 * USB bus with the core and calls the hc_driver->start() function. It returns
 * a negative error on failure.
 */
int dwc2_hcd_init(struct dwc2_hsotg *hsotg)
{
        struct platform_device *pdev = to_platform_device(hsotg->dev);
        struct resource *res;
        struct usb_hcd *hcd;
        struct dwc2_host_chan *channel;
        u32 hcfg;
        int i, num_channels;
        int retval;

        if (usb_disabled())
                return -ENODEV;

        dev_dbg(hsotg->dev, "DWC OTG HCD INIT\n");

        retval = -ENOMEM;

        hcfg = dwc2_readl(hsotg, HCFG);
        dev_dbg(hsotg->dev, "hcfg=%08x\n", hcfg);

#ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
        hsotg->frame_num_array = kcalloc(FRAME_NUM_ARRAY_SIZE,
                                         sizeof(*hsotg->frame_num_array),
                                         GFP_KERNEL);
        if (!hsotg->frame_num_array)
                goto error1;
        hsotg->last_frame_num_array =
                kcalloc(FRAME_NUM_ARRAY_SIZE,
                        sizeof(*hsotg->last_frame_num_array), GFP_KERNEL);
        if (!hsotg->last_frame_num_array)
                goto error1;
#endif
        hsotg->last_frame_num = HFNUM_MAX_FRNUM;

        /* Check if the bus driver or platform code has setup a dma_mask */
        if (hsotg->params.host_dma &&
            !hsotg->dev->dma_mask) {
                dev_warn(hsotg->dev,
                         "dma_mask not set, disabling DMA\n");
                hsotg->params.host_dma = false;
                hsotg->params.dma_desc_enable = false;
        }

        /* Set device flags indicating whether the HCD supports DMA */
        if (hsotg->params.host_dma) {
                if (dma_set_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0)
                        dev_warn(hsotg->dev, "can't set DMA mask\n");
                if (dma_set_coherent_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0)
                        dev_warn(hsotg->dev, "can't set coherent DMA mask\n");
        }

        if (hsotg->params.change_speed_quirk) {
                dwc2_hc_driver.free_dev = dwc2_free_dev;
                dwc2_hc_driver.reset_device = dwc2_reset_device;
        }

        if (hsotg->params.host_dma)
                dwc2_hc_driver.flags |= HCD_DMA;

        hcd = usb_create_hcd(&dwc2_hc_driver, hsotg->dev, dev_name(hsotg->dev));
        if (!hcd)
                goto error1;

        hcd->has_tt = 1;

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!res) {
                retval = -EINVAL;
                goto error2;
        }
        hcd->rsrc_start = res->start;
        hcd->rsrc_len = resource_size(res);

        ((struct wrapper_priv_data *)&hcd->hcd_priv)->hsotg = hsotg;
        hsotg->priv = hcd;

        /*
         * Disable the global interrupt until all the interrupt handlers are
         * installed
         */
        dwc2_disable_global_interrupts(hsotg);

        /* Initialize the DWC_otg core, and select the Phy type */
        retval = dwc2_core_init(hsotg, true);
        if (retval)
                goto error2;

        /* Create new workqueue and init work */
        retval = -ENOMEM;
        hsotg->wq_otg = alloc_ordered_workqueue("dwc2", 0);
        if (!hsotg->wq_otg) {
                dev_err(hsotg->dev, "Failed to create workqueue\n");
                goto error2;
        }
        INIT_WORK(&hsotg->wf_otg, dwc2_conn_id_status_change);

        timer_setup(&hsotg->wkp_timer, dwc2_wakeup_detected, 0);

        /* Initialize the non-periodic schedule */
        INIT_LIST_HEAD(&hsotg->non_periodic_sched_inactive);
        INIT_LIST_HEAD(&hsotg->non_periodic_sched_waiting);
        INIT_LIST_HEAD(&hsotg->non_periodic_sched_active);

        /* Initialize the periodic schedule */
        INIT_LIST_HEAD(&hsotg->periodic_sched_inactive);
        INIT_LIST_HEAD(&hsotg->periodic_sched_ready);
        INIT_LIST_HEAD(&hsotg->periodic_sched_assigned);
        INIT_LIST_HEAD(&hsotg->periodic_sched_queued);

        INIT_LIST_HEAD(&hsotg->split_order);

        /*
         * Create a host channel descriptor for each host channel implemented
         * in the controller. Initialize the channel descriptor array.
         */
        INIT_LIST_HEAD(&hsotg->free_hc_list);
        num_channels = hsotg->params.host_channels;
        memset(&hsotg->hc_ptr_array[0], 0, sizeof(hsotg->hc_ptr_array));

        for (i = 0; i < num_channels; i++) {
                channel = kzalloc_obj(*channel);
                if (!channel)
                        goto error3;
                channel->hc_num = i;
                INIT_LIST_HEAD(&channel->split_order_list_entry);
                hsotg->hc_ptr_array[i] = channel;
        }

        /* Initialize work */
        INIT_DELAYED_WORK(&hsotg->start_work, dwc2_hcd_start_func);
        INIT_DELAYED_WORK(&hsotg->reset_work, dwc2_hcd_reset_func);
        INIT_WORK(&hsotg->phy_reset_work, dwc2_hcd_phy_reset_func);

        /*
         * Allocate space for storing data on status transactions. Normally no
         * data is sent, but this space acts as a bit bucket. This must be
         * done after usb_add_hcd since that function allocates the DMA buffer
         * pool.
         */
        if (hsotg->params.host_dma)
                hsotg->status_buf = dma_alloc_coherent(hsotg->dev,
                                        DWC2_HCD_STATUS_BUF_SIZE,
                                        &hsotg->status_buf_dma, GFP_KERNEL);
        else
                hsotg->status_buf = kzalloc(DWC2_HCD_STATUS_BUF_SIZE,
                                          GFP_KERNEL);

        if (!hsotg->status_buf)
                goto error3;

        /*
         * Create kmem caches to handle descriptor buffers in descriptor
         * DMA mode.
         * Alignment must be set to 512 bytes.
         */
        if (hsotg->params.dma_desc_enable ||
            hsotg->params.dma_desc_fs_enable) {
                hsotg->desc_gen_cache = kmem_cache_create("dwc2-gen-desc",
                                sizeof(struct dwc2_dma_desc) *
                                MAX_DMA_DESC_NUM_GENERIC, 512, SLAB_CACHE_DMA,
                                NULL);
                if (!hsotg->desc_gen_cache) {
                        dev_err(hsotg->dev,
                                "unable to create dwc2 generic desc cache\n");

                        /*
                         * Disable descriptor dma mode since it will not be
                         * usable.
                         */
                        hsotg->params.dma_desc_enable = false;
                        hsotg->params.dma_desc_fs_enable = false;
                }

                hsotg->desc_hsisoc_cache = kmem_cache_create("dwc2-hsisoc-desc",
                                sizeof(struct dwc2_dma_desc) *
                                MAX_DMA_DESC_NUM_HS_ISOC, 512, 0, NULL);
                if (!hsotg->desc_hsisoc_cache) {
                        dev_err(hsotg->dev,
                                "unable to create dwc2 hs isoc desc cache\n");

                        kmem_cache_destroy(hsotg->desc_gen_cache);

                        /*
                         * Disable descriptor dma mode since it will not be
                         * usable.
                         */
                        hsotg->params.dma_desc_enable = false;
                        hsotg->params.dma_desc_fs_enable = false;
                }
        }

        if (hsotg->params.host_dma) {
                /*
                 * Create kmem caches to handle non-aligned buffer
                 * in Buffer DMA mode.
                 */
                hsotg->unaligned_cache = kmem_cache_create("dwc2-unaligned-dma",
                                                DWC2_KMEM_UNALIGNED_BUF_SIZE, 4,
                                                SLAB_CACHE_DMA, NULL);
                if (!hsotg->unaligned_cache)
                        dev_err(hsotg->dev,
                                "unable to create dwc2 unaligned cache\n");
        }

        hsotg->otg_port = 1;
        hsotg->frame_list = NULL;
        hsotg->frame_list_dma = 0;
        hsotg->periodic_qh_count = 0;

        /* Initiate lx_state to L3 disconnected state */
        hsotg->lx_state = DWC2_L3;

        hcd->self.otg_port = hsotg->otg_port;

        /* Don't support SG list at this point */
        hcd->self.sg_tablesize = 0;

        hcd->tpl_support = of_usb_host_tpl_support(hsotg->dev->of_node);

        if (!IS_ERR_OR_NULL(hsotg->uphy))
                otg_set_host(hsotg->uphy->otg, &hcd->self);

        /*
         * Finish generic HCD initialization and start the HCD. This function
         * allocates the DMA buffer pool, registers the USB bus, requests the
         * IRQ line, and calls hcd_start method.
         */
        retval = usb_add_hcd(hcd, hsotg->irq, IRQF_SHARED);
        if (retval < 0)
                goto error4;

        device_wakeup_enable(hcd->self.controller);

        dwc2_hcd_dump_state(hsotg);

        dwc2_enable_global_interrupts(hsotg);

        return 0;

error4:
        kmem_cache_destroy(hsotg->unaligned_cache);
        kmem_cache_destroy(hsotg->desc_hsisoc_cache);
        kmem_cache_destroy(hsotg->desc_gen_cache);
error3:
        dwc2_hcd_release(hsotg);
error2:
        usb_put_hcd(hcd);
error1:

#ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
        kfree(hsotg->last_frame_num_array);
        kfree(hsotg->frame_num_array);
#endif

        dev_err(hsotg->dev, "%s() FAILED, returning %d\n", __func__, retval);
        return retval;
}

/*
 * Removes the HCD.
 * Frees memory and resources associated with the HCD and deregisters the bus.
 */
void dwc2_hcd_remove(struct dwc2_hsotg *hsotg)
{
        struct usb_hcd *hcd;

        dev_dbg(hsotg->dev, "DWC OTG HCD REMOVE\n");

        hcd = dwc2_hsotg_to_hcd(hsotg);
        dev_dbg(hsotg->dev, "hsotg->hcd = %p\n", hcd);

        if (!hcd) {
                dev_dbg(hsotg->dev, "%s: dwc2_hsotg_to_hcd(hsotg) NULL!\n",
                        __func__);
                return;
        }

        if (!IS_ERR_OR_NULL(hsotg->uphy))
                otg_set_host(hsotg->uphy->otg, NULL);

        usb_remove_hcd(hcd);
        hsotg->priv = NULL;

        kmem_cache_destroy(hsotg->unaligned_cache);
        kmem_cache_destroy(hsotg->desc_hsisoc_cache);
        kmem_cache_destroy(hsotg->desc_gen_cache);

        dwc2_hcd_release(hsotg);
        usb_put_hcd(hcd);

#ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
        kfree(hsotg->last_frame_num_array);
        kfree(hsotg->frame_num_array);
#endif
}

/**
 * dwc2_backup_host_registers() - Backup controller host registers.
 * When suspending usb bus, registers needs to be backuped
 * if controller power is disabled once suspended.
 *
 * @hsotg: Programming view of the DWC_otg controller
 */
int dwc2_backup_host_registers(struct dwc2_hsotg *hsotg)
{
        struct dwc2_hregs_backup *hr;
        int i;

        dev_dbg(hsotg->dev, "%s\n", __func__);

        /* Backup Host regs */
        hr = &hsotg->hr_backup;
        hr->hcfg = dwc2_readl(hsotg, HCFG);
        hr->hflbaddr = dwc2_readl(hsotg, HFLBADDR);
        hr->haintmsk = dwc2_readl(hsotg, HAINTMSK);
        for (i = 0; i < hsotg->params.host_channels; ++i) {
                hr->hcchar[i] = dwc2_readl(hsotg, HCCHAR(i));
                hr->hcsplt[i] = dwc2_readl(hsotg, HCSPLT(i));
                hr->hcintmsk[i] = dwc2_readl(hsotg, HCINTMSK(i));
                hr->hctsiz[i] = dwc2_readl(hsotg, HCTSIZ(i));
                hr->hcidma[i] = dwc2_readl(hsotg, HCDMA(i));
                hr->hcidmab[i] = dwc2_readl(hsotg, HCDMAB(i));
        }

        hr->hprt0 = dwc2_read_hprt0(hsotg);
        hr->hfir = dwc2_readl(hsotg, HFIR);
        hr->hptxfsiz = dwc2_readl(hsotg, HPTXFSIZ);
        hr->valid = true;

        return 0;
}

/**
 * dwc2_restore_host_registers() - Restore controller host registers.
 * When resuming usb bus, device registers needs to be restored
 * if controller power were disabled.
 *
 * @hsotg: Programming view of the DWC_otg controller
 */
int dwc2_restore_host_registers(struct dwc2_hsotg *hsotg)
{
        struct dwc2_hregs_backup *hr;
        int i;

        dev_dbg(hsotg->dev, "%s\n", __func__);

        /* Restore host regs */
        hr = &hsotg->hr_backup;
        if (!hr->valid) {
                dev_err(hsotg->dev, "%s: no host registers to restore\n",
                        __func__);
                return -EINVAL;
        }
        hr->valid = false;

        dwc2_writel(hsotg, hr->hcfg, HCFG);
        dwc2_writel(hsotg, hr->hflbaddr, HFLBADDR);
        dwc2_writel(hsotg, hr->haintmsk, HAINTMSK);

        for (i = 0; i < hsotg->params.host_channels; ++i) {
                dwc2_writel(hsotg, hr->hcchar[i], HCCHAR(i));
                dwc2_writel(hsotg, hr->hcsplt[i], HCSPLT(i));
                dwc2_writel(hsotg, hr->hcintmsk[i], HCINTMSK(i));
                dwc2_writel(hsotg, hr->hctsiz[i], HCTSIZ(i));
                dwc2_writel(hsotg, hr->hcidma[i], HCDMA(i));
                dwc2_writel(hsotg, hr->hcidmab[i], HCDMAB(i));
        }

        dwc2_writel(hsotg, hr->hprt0, HPRT0);
        dwc2_writel(hsotg, hr->hfir, HFIR);
        dwc2_writel(hsotg, hr->hptxfsiz, HPTXFSIZ);
        hsotg->frame_number = 0;

        return 0;
}

int dwc2_host_backup_critical_registers(struct dwc2_hsotg *hsotg)
{
        int ret;

        /* Backup all registers */
        ret = dwc2_backup_global_registers(hsotg);
        if (ret) {
                dev_err(hsotg->dev, "%s: failed to backup global registers\n",
                        __func__);
                return ret;
        }

        ret = dwc2_backup_host_registers(hsotg);
        if (ret) {
                dev_err(hsotg->dev, "%s: failed to backup host registers\n",
                        __func__);
                return ret;
        }

        return 0;
}

int dwc2_host_restore_critical_registers(struct dwc2_hsotg *hsotg)
{
        int ret;

        ret = dwc2_restore_global_registers(hsotg);
        if (ret) {
                dev_err(hsotg->dev, "%s: failed to restore registers\n",
                        __func__);
                return ret;
        }

        ret = dwc2_restore_host_registers(hsotg);
        if (ret) {
                dev_err(hsotg->dev, "%s: failed to restore host registers\n",
                        __func__);
                return ret;
        }

        return 0;
}

/**
 * dwc2_host_enter_hibernation() - Put controller in Hibernation.
 *
 * @hsotg: Programming view of the DWC_otg controller
 */
int dwc2_host_enter_hibernation(struct dwc2_hsotg *hsotg)
{
        unsigned long flags;
        int ret = 0;
        u32 hprt0;
        u32 pcgcctl;
        u32 gusbcfg;
        u32 gpwrdn;

        dev_dbg(hsotg->dev, "Preparing host for hibernation\n");
        ret = dwc2_host_backup_critical_registers(hsotg);
        if (ret)
                return ret;

        /* Enter USB Suspend Mode */
        hprt0 = dwc2_readl(hsotg, HPRT0);
        hprt0 |= HPRT0_SUSP;
        hprt0 &= ~HPRT0_ENA;
        dwc2_writel(hsotg, hprt0, HPRT0);

        /* Wait for the HPRT0.PrtSusp register field to be set */
        if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 5000))
                dev_warn(hsotg->dev, "Suspend wasn't generated\n");

        /*
         * We need to disable interrupts to prevent servicing of any IRQ
         * during going to hibernation
         */
        spin_lock_irqsave(&hsotg->lock, flags);
        hsotg->lx_state = DWC2_L2;

        gusbcfg = dwc2_readl(hsotg, GUSBCFG);
        if (gusbcfg & GUSBCFG_ULPI_UTMI_SEL) {
                /* ULPI interface */
                udelay(10);
                gpwrdn = dwc2_readl(hsotg, GPWRDN);
                gpwrdn |= GPWRDN_ULPI_LATCH_EN_DURING_HIB_ENTRY;
                dwc2_writel(hsotg, gpwrdn, GPWRDN);
                udelay(10);
                /* Suspend the Phy Clock */
                pcgcctl = dwc2_readl(hsotg, PCGCTL);
                pcgcctl |= PCGCTL_STOPPCLK;
                dwc2_writel(hsotg, pcgcctl, PCGCTL);
                udelay(10);

                gpwrdn = dwc2_readl(hsotg, GPWRDN);
                gpwrdn |= GPWRDN_PMUACTV;
                dwc2_writel(hsotg, gpwrdn, GPWRDN);
                udelay(10);
        } else {
                /* UTMI+ Interface */
                gpwrdn = dwc2_readl(hsotg, GPWRDN);
                gpwrdn |= GPWRDN_PMUACTV;
                dwc2_writel(hsotg, gpwrdn, GPWRDN);
                udelay(10);

                pcgcctl = dwc2_readl(hsotg, PCGCTL);
                pcgcctl |= PCGCTL_STOPPCLK;
                dwc2_writel(hsotg, pcgcctl, PCGCTL);
                udelay(10);
        }

        /* Enable interrupts from wake up logic */
        gpwrdn = dwc2_readl(hsotg, GPWRDN);
        gpwrdn |= GPWRDN_PMUINTSEL;
        dwc2_writel(hsotg, gpwrdn, GPWRDN);
        udelay(10);

        /* Unmask host mode interrupts in GPWRDN */
        gpwrdn = dwc2_readl(hsotg, GPWRDN);
        gpwrdn |= GPWRDN_DISCONN_DET_MSK;
        gpwrdn |= GPWRDN_LNSTSCHG_MSK;
        gpwrdn |= GPWRDN_STS_CHGINT_MSK;
        dwc2_writel(hsotg, gpwrdn, GPWRDN);
        udelay(10);

        /* Enable Power Down Clamp */
        gpwrdn = dwc2_readl(hsotg, GPWRDN);
        gpwrdn |= GPWRDN_PWRDNCLMP;
        dwc2_writel(hsotg, gpwrdn, GPWRDN);
        udelay(10);

        /* Switch off VDD */
        gpwrdn = dwc2_readl(hsotg, GPWRDN);
        gpwrdn |= GPWRDN_PWRDNSWTCH;
        dwc2_writel(hsotg, gpwrdn, GPWRDN);

        hsotg->hibernated = 1;
        hsotg->bus_suspended = 1;
        dev_dbg(hsotg->dev, "Host hibernation completed\n");
        spin_unlock_irqrestore(&hsotg->lock, flags);
        return ret;
}

/*
 * dwc2_host_exit_hibernation()
 *
 * @hsotg: Programming view of the DWC_otg controller
 * @rem_wakeup: indicates whether resume is initiated by Device or Host.
 * @param reset: indicates whether resume is initiated by Reset.
 *
 * Return: non-zero if failed to enter to hibernation.
 *
 * This function is for exiting from Host mode hibernation by
 * Host Initiated Resume/Reset and Device Initiated Remote-Wakeup.
 */
int dwc2_host_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup,
                               int reset)
{
        u32 gpwrdn;
        u32 hprt0;
        int ret = 0;
        struct dwc2_gregs_backup *gr;
        struct dwc2_hregs_backup *hr;

        gr = &hsotg->gr_backup;
        hr = &hsotg->hr_backup;

        dev_dbg(hsotg->dev,
                "%s: called with rem_wakeup = %d reset = %d\n",
                __func__, rem_wakeup, reset);

        dwc2_hib_restore_common(hsotg, rem_wakeup, 1);
        hsotg->hibernated = 0;

        /*
         * This step is not described in functional spec but if not wait for
         * this delay, mismatch interrupts occurred because just after restore
         * core is in Device mode(gintsts.curmode == 0)
         */
        mdelay(100);

        /* Clear all pending interupts */
        dwc2_writel(hsotg, 0xffffffff, GINTSTS);

        /* De-assert Restore */
        gpwrdn = dwc2_readl(hsotg, GPWRDN);
        gpwrdn &= ~GPWRDN_RESTORE;
        dwc2_writel(hsotg, gpwrdn, GPWRDN);
        udelay(10);

        /* Restore GUSBCFG, HCFG */
        dwc2_writel(hsotg, gr->gusbcfg, GUSBCFG);
        dwc2_writel(hsotg, hr->hcfg, HCFG);

        /* Reset ULPI latch */
        gpwrdn = dwc2_readl(hsotg, GPWRDN);
        gpwrdn &= ~GPWRDN_ULPI_LATCH_EN_DURING_HIB_ENTRY;
        dwc2_writel(hsotg, gpwrdn, GPWRDN);

        /* De-assert Wakeup Logic */
        if (!(rem_wakeup && hsotg->hw_params.snpsid >= DWC2_CORE_REV_4_30a)) {
                gpwrdn = dwc2_readl(hsotg, GPWRDN);
                gpwrdn &= ~GPWRDN_PMUACTV;
                dwc2_writel(hsotg, gpwrdn, GPWRDN);
                udelay(10);
        }

        hprt0 = hr->hprt0;
        hprt0 |= HPRT0_PWR;
        hprt0 &= ~HPRT0_ENA;
        hprt0 &= ~HPRT0_SUSP;
        dwc2_writel(hsotg, hprt0, HPRT0);

        hprt0 = hr->hprt0;
        hprt0 |= HPRT0_PWR;
        hprt0 &= ~HPRT0_ENA;
        hprt0 &= ~HPRT0_SUSP;

        if (reset) {
                hprt0 |= HPRT0_RST;
                dwc2_writel(hsotg, hprt0, HPRT0);

                /* Wait for Resume time and then program HPRT again */
                mdelay(60);
                hprt0 &= ~HPRT0_RST;
                dwc2_writel(hsotg, hprt0, HPRT0);
        } else {
                hprt0 |= HPRT0_RES;
                dwc2_writel(hsotg, hprt0, HPRT0);

                /* De-assert Wakeup Logic */
                if ((rem_wakeup && hsotg->hw_params.snpsid >= DWC2_CORE_REV_4_30a)) {
                        gpwrdn = dwc2_readl(hsotg, GPWRDN);
                        gpwrdn &= ~GPWRDN_PMUACTV;
                        dwc2_writel(hsotg, gpwrdn, GPWRDN);
                        udelay(10);
                }
                /* Wait for Resume time and then program HPRT again */
                mdelay(100);
                hprt0 &= ~HPRT0_RES;
                dwc2_writel(hsotg, hprt0, HPRT0);
        }
        /* Clear all interrupt status */
        hprt0 = dwc2_readl(hsotg, HPRT0);
        hprt0 |= HPRT0_CONNDET;
        hprt0 |= HPRT0_ENACHG;
        hprt0 &= ~HPRT0_ENA;
        dwc2_writel(hsotg, hprt0, HPRT0);

        hprt0 = dwc2_readl(hsotg, HPRT0);

        /* Clear all pending interupts */
        dwc2_writel(hsotg, 0xffffffff, GINTSTS);

        /* Restore global registers */
        ret = dwc2_host_restore_critical_registers(hsotg);
        if (ret)
                return ret;

        if (rem_wakeup) {
                dwc2_hcd_rem_wakeup(hsotg);
                /*
                 * Change "port_connect_status_change" flag to re-enumerate,
                 * because after exit from hibernation port connection status
                 * is not detected.
                 */
                hsotg->flags.b.port_connect_status_change = 1;
        }

        hsotg->hibernated = 0;
        hsotg->bus_suspended = 0;
        hsotg->lx_state = DWC2_L0;
        dev_dbg(hsotg->dev, "Host hibernation restore complete\n");
        return ret;
}

bool dwc2_host_can_poweroff_phy(struct dwc2_hsotg *dwc2)
{
        struct usb_device *root_hub = dwc2_hsotg_to_hcd(dwc2)->self.root_hub;

        /* If the controller isn't allowed to wakeup then we can power off. */
        if (!device_may_wakeup(dwc2->dev))
                return true;

        /*
         * We don't want to power off the PHY if something under the
         * root hub has wakeup enabled.
         */
        if (usb_wakeup_enabled_descendants(root_hub))
                return false;

        /* No reason to keep the PHY powered, so allow poweroff */
        return true;
}

/**
 * dwc2_host_enter_partial_power_down() - Put controller in partial
 * power down.
 *
 * @hsotg: Programming view of the DWC_otg controller
 *
 * Return: non-zero if failed to enter host partial power down.
 *
 * This function is for entering Host mode partial power down.
 */
int dwc2_host_enter_partial_power_down(struct dwc2_hsotg *hsotg)
{
        u32 pcgcctl;
        u32 hprt0;
        int ret = 0;

        dev_dbg(hsotg->dev, "Entering host partial power down started.\n");

        /* Put this port in suspend mode. */
        hprt0 = dwc2_read_hprt0(hsotg);
        hprt0 |= HPRT0_SUSP;
        dwc2_writel(hsotg, hprt0, HPRT0);
        udelay(5);

        /* Wait for the HPRT0.PrtSusp register field to be set */
        if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 3000))
                dev_warn(hsotg->dev, "Suspend wasn't generated\n");

        /* Backup all registers */
        ret = dwc2_host_backup_critical_registers(hsotg);
        if (ret)
                return ret;

        /*
         * Clear any pending interrupts since dwc2 will not be able to
         * clear them after entering partial_power_down.
         */
        dwc2_writel(hsotg, 0xffffffff, GINTSTS);

        /* Put the controller in low power state */
        pcgcctl = dwc2_readl(hsotg, PCGCTL);

        pcgcctl |= PCGCTL_PWRCLMP;
        dwc2_writel(hsotg, pcgcctl, PCGCTL);
        udelay(5);

        pcgcctl |= PCGCTL_RSTPDWNMODULE;
        dwc2_writel(hsotg, pcgcctl, PCGCTL);
        udelay(5);

        pcgcctl |= PCGCTL_STOPPCLK;
        dwc2_writel(hsotg, pcgcctl, PCGCTL);

        /* Set in_ppd flag to 1 as here core enters suspend. */
        hsotg->in_ppd = 1;
        hsotg->lx_state = DWC2_L2;
        hsotg->bus_suspended = true;

        dev_dbg(hsotg->dev, "Entering host partial power down completed.\n");

        return ret;
}

/*
 * dwc2_host_exit_partial_power_down() - Exit controller from host partial
 * power down.
 *
 * @hsotg: Programming view of the DWC_otg controller
 * @rem_wakeup: indicates whether resume is initiated by Reset.
 * @restore: indicates whether need to restore the registers or not.
 *
 * Return: non-zero if failed to exit host partial power down.
 *
 * This function is for exiting from Host mode partial power down.
 */
int dwc2_host_exit_partial_power_down(struct dwc2_hsotg *hsotg,
                                      int rem_wakeup, bool restore)
{
        u32 pcgcctl;
        int ret = 0;
        u32 hprt0;

        dev_dbg(hsotg->dev, "Exiting host partial power down started.\n");

        pcgcctl = dwc2_readl(hsotg, PCGCTL);
        pcgcctl &= ~PCGCTL_STOPPCLK;
        dwc2_writel(hsotg, pcgcctl, PCGCTL);
        udelay(5);

        pcgcctl = dwc2_readl(hsotg, PCGCTL);
        pcgcctl &= ~PCGCTL_PWRCLMP;
        dwc2_writel(hsotg, pcgcctl, PCGCTL);
        udelay(5);

        pcgcctl = dwc2_readl(hsotg, PCGCTL);
        pcgcctl &= ~PCGCTL_RSTPDWNMODULE;
        dwc2_writel(hsotg, pcgcctl, PCGCTL);

        udelay(100);
        if (restore) {
                ret = dwc2_host_restore_critical_registers(hsotg);
                if (ret)
                        return ret;
        }

        /* Drive resume signaling and exit suspend mode on the port. */
        hprt0 = dwc2_read_hprt0(hsotg);
        hprt0 |= HPRT0_RES;
        hprt0 &= ~HPRT0_SUSP;
        dwc2_writel(hsotg, hprt0, HPRT0);
        udelay(5);

        if (!rem_wakeup) {
                /* Stop driveing resume signaling on the port. */
                hprt0 = dwc2_read_hprt0(hsotg);
                hprt0 &= ~HPRT0_RES;
                dwc2_writel(hsotg, hprt0, HPRT0);

                hsotg->bus_suspended = false;
        } else {
                /* Turn on the port power bit. */
                hprt0 = dwc2_read_hprt0(hsotg);
                hprt0 |= HPRT0_PWR;
                dwc2_writel(hsotg, hprt0, HPRT0);

                /* Connect hcd. */
                dwc2_hcd_connect(hsotg);

                mod_timer(&hsotg->wkp_timer,
                          jiffies + msecs_to_jiffies(71));
        }

        /* Set lx_state to and in_ppd to 0 as here core exits from suspend. */
        hsotg->in_ppd = 0;
        hsotg->lx_state = DWC2_L0;

        dev_dbg(hsotg->dev, "Exiting host partial power down completed.\n");
        return ret;
}

/**
 * dwc2_host_enter_clock_gating() - Put controller in clock gating.
 *
 * @hsotg: Programming view of the DWC_otg controller
 *
 * This function is for entering Host mode clock gating.
 */
void dwc2_host_enter_clock_gating(struct dwc2_hsotg *hsotg)
{
        u32 hprt0;
        u32 pcgctl;

        dev_dbg(hsotg->dev, "Entering host clock gating.\n");

        /* Put this port in suspend mode. */
        hprt0 = dwc2_read_hprt0(hsotg);
        hprt0 |= HPRT0_SUSP;
        dwc2_writel(hsotg, hprt0, HPRT0);

        /* Set the Phy Clock bit as suspend is received. */
        pcgctl = dwc2_readl(hsotg, PCGCTL);
        pcgctl |= PCGCTL_STOPPCLK;
        dwc2_writel(hsotg, pcgctl, PCGCTL);
        udelay(5);

        /* Set the Gate hclk as suspend is received. */
        pcgctl = dwc2_readl(hsotg, PCGCTL);
        pcgctl |= PCGCTL_GATEHCLK;
        dwc2_writel(hsotg, pcgctl, PCGCTL);
        udelay(5);

        hsotg->bus_suspended = true;
        hsotg->lx_state = DWC2_L2;
}

/**
 * dwc2_host_exit_clock_gating() - Exit controller from clock gating.
 *
 * @hsotg: Programming view of the DWC_otg controller
 * @rem_wakeup: indicates whether resume is initiated by remote wakeup
 *
 * This function is for exiting Host mode clock gating.
 */
void dwc2_host_exit_clock_gating(struct dwc2_hsotg *hsotg, int rem_wakeup)
{
        u32 hprt0;
        u32 pcgctl;

        dev_dbg(hsotg->dev, "Exiting host clock gating.\n");

        /* Clear the Gate hclk. */
        pcgctl = dwc2_readl(hsotg, PCGCTL);
        pcgctl &= ~PCGCTL_GATEHCLK;
        dwc2_writel(hsotg, pcgctl, PCGCTL);
        udelay(5);

        /* Phy Clock bit. */
        pcgctl = dwc2_readl(hsotg, PCGCTL);
        pcgctl &= ~PCGCTL_STOPPCLK;
        dwc2_writel(hsotg, pcgctl, PCGCTL);
        udelay(5);

        /* Drive resume signaling and exit suspend mode on the port. */
        hprt0 = dwc2_read_hprt0(hsotg);
        hprt0 |= HPRT0_RES;
        hprt0 &= ~HPRT0_SUSP;
        dwc2_writel(hsotg, hprt0, HPRT0);
        udelay(5);

        if (!rem_wakeup) {
                /* In case of port resume need to wait for 40 ms */
                msleep(USB_RESUME_TIMEOUT);

                /* Stop driveing resume signaling on the port. */
                hprt0 = dwc2_read_hprt0(hsotg);
                hprt0 &= ~HPRT0_RES;
                dwc2_writel(hsotg, hprt0, HPRT0);

                hsotg->bus_suspended = false;
                hsotg->lx_state = DWC2_L0;
        } else {
                mod_timer(&hsotg->wkp_timer,
                          jiffies + msecs_to_jiffies(71));
        }
}