// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2004-2007,2011-2012 Freescale Semiconductor, Inc.
 * All rights reserved.
 *
 * Author: Li Yang <leoli@freescale.com>
 *         Jiang Bo <tanya.jiang@freescale.com>
 *
 * Description:
 * Freescale high-speed USB SOC DR module device controller driver.
 * This can be found on MPC8349E/MPC8313E/MPC5121E cpus.
 * The driver is previously named as mpc_udc.  Based on bare board
 * code from Dave Liu and Shlomi Gridish.
 */

#define pr_fmt(x) "udc: " x

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/string_choices.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/mm.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/fsl_devices.h>
#include <linux/dmapool.h>

#include <asm/byteorder.h>
#include <asm/io.h>
#include <linux/unaligned.h>
#include <asm/dma.h>

#include "fsl_usb2_udc.h"

#define DRIVER_DESC     "Freescale High-Speed USB SOC Device Controller driver"
#define DRIVER_AUTHOR   "Li Yang/Jiang Bo"
#define DRIVER_VERSION  "Apr 20, 2007"

#define DMA_ADDR_INVALID        (~(dma_addr_t)0)

static const char driver_name[] = "fsl-usb2-udc";

static struct usb_dr_device __iomem *dr_regs;

static struct usb_sys_interface __iomem *usb_sys_regs;

/* it is initialized in probe()  */
static struct fsl_udc *udc_controller = NULL;

static const struct usb_endpoint_descriptor
fsl_ep0_desc = {
        .bLength =              USB_DT_ENDPOINT_SIZE,
        .bDescriptorType =      USB_DT_ENDPOINT,
        .bEndpointAddress =     0,
        .bmAttributes =         USB_ENDPOINT_XFER_CONTROL,
        .wMaxPacketSize =       USB_MAX_CTRL_PAYLOAD,
};

static void fsl_ep_fifo_flush(struct usb_ep *_ep);

#ifdef CONFIG_PPC32
/*
 * On some SoCs, the USB controller registers can be big or little endian,
 * depending on the version of the chip. In order to be able to run the
 * same kernel binary on 2 different versions of an SoC, the BE/LE decision
 * must be made at run time. _fsl_readl and fsl_writel are pointers to the
 * BE or LE readl() and writel() functions, and fsl_readl() and fsl_writel()
 * call through those pointers. Platform code for SoCs that have BE USB
 * registers should set pdata->big_endian_mmio flag.
 *
 * This also applies to controller-to-cpu accessors for the USB descriptors,
 * since their endianness is also SoC dependant. Platform code for SoCs that
 * have BE USB descriptors should set pdata->big_endian_desc flag.
 */
static u32 _fsl_readl_be(const unsigned __iomem *p)
{
        return in_be32(p);
}

static u32 _fsl_readl_le(const unsigned __iomem *p)
{
        return in_le32(p);
}

static void _fsl_writel_be(u32 v, unsigned __iomem *p)
{
        out_be32(p, v);
}

static void _fsl_writel_le(u32 v, unsigned __iomem *p)
{
        out_le32(p, v);
}

static u32 (*_fsl_readl)(const unsigned __iomem *p);
static void (*_fsl_writel)(u32 v, unsigned __iomem *p);

#define fsl_readl(p)            (*_fsl_readl)((p))
#define fsl_writel(v, p)        (*_fsl_writel)((v), (p))

static inline void fsl_set_accessors(struct fsl_usb2_platform_data *pdata)
{
        if (pdata->big_endian_mmio) {
                _fsl_readl = _fsl_readl_be;
                _fsl_writel = _fsl_writel_be;
        } else {
                _fsl_readl = _fsl_readl_le;
                _fsl_writel = _fsl_writel_le;
        }
}

static inline u32 cpu_to_hc32(const u32 x)
{
        return udc_controller->pdata->big_endian_desc
                ? (__force u32)cpu_to_be32(x)
                : (__force u32)cpu_to_le32(x);
}

static inline u32 hc32_to_cpu(const u32 x)
{
        return udc_controller->pdata->big_endian_desc
                ? be32_to_cpu((__force __be32)x)
                : le32_to_cpu((__force __le32)x);
}
#else /* !CONFIG_PPC32 */
static inline void fsl_set_accessors(struct fsl_usb2_platform_data *pdata) {}

#define fsl_readl(addr)         readl(addr)
#define fsl_writel(val32, addr) writel(val32, addr)
#define cpu_to_hc32(x)          cpu_to_le32(x)
#define hc32_to_cpu(x)          le32_to_cpu(x)
#endif /* CONFIG_PPC32 */

/********************************************************************
 *      Internal Used Function
********************************************************************/
/*-----------------------------------------------------------------
 * done() - retire a request; caller blocked irqs
 * @status : request status to be set, only works when
 *      request is still in progress.
 *--------------------------------------------------------------*/
static void done(struct fsl_ep *ep, struct fsl_req *req, int status)
__releases(ep->udc->lock)
__acquires(ep->udc->lock)
{
        struct fsl_udc *udc = NULL;
        unsigned char stopped = ep->stopped;
        struct ep_td_struct *curr_td, *next_td;
        int j;

        udc = (struct fsl_udc *)ep->udc;
        /* Removed the req from fsl_ep->queue */
        list_del_init(&req->queue);

        /* req.status should be set as -EINPROGRESS in ep_queue() */
        if (req->req.status == -EINPROGRESS)
                req->req.status = status;
        else
                status = req->req.status;

        /* Free dtd for the request */
        next_td = req->head;
        for (j = 0; j < req->dtd_count; j++) {
                curr_td = next_td;
                if (j != req->dtd_count - 1) {
                        next_td = curr_td->next_td_virt;
                }
                dma_pool_free(udc->td_pool, curr_td, curr_td->td_dma);
        }

        usb_gadget_unmap_request(&ep->udc->gadget, &req->req, ep_is_in(ep));

        if (status && (status != -ESHUTDOWN))
                dev_vdbg(&udc->gadget.dev, "complete %s req %p stat %d len %u/%u\n",
                         ep->ep.name, &req->req, status,
                         req->req.actual, req->req.length);

        ep->stopped = 1;

        spin_unlock(&ep->udc->lock);

        usb_gadget_giveback_request(&ep->ep, &req->req);

        spin_lock(&ep->udc->lock);
        ep->stopped = stopped;
}

/*-----------------------------------------------------------------
 * nuke(): delete all requests related to this ep
 * called with spinlock held
 *--------------------------------------------------------------*/
static void nuke(struct fsl_ep *ep, int status)
{
        ep->stopped = 1;

        /* Flush fifo */
        fsl_ep_fifo_flush(&ep->ep);

        /* Whether this eq has request linked */
        while (!list_empty(&ep->queue)) {
                struct fsl_req *req = NULL;

                req = list_entry(ep->queue.next, struct fsl_req, queue);
                done(ep, req, status);
        }
}

/*------------------------------------------------------------------
        Internal Hardware related function
 ------------------------------------------------------------------*/

static int dr_controller_setup(struct fsl_udc *udc)
{
        unsigned int tmp, portctrl, ep_num;
        unsigned int max_no_of_ep;
        unsigned int ctrl;
        unsigned long timeout;

#define FSL_UDC_RESET_TIMEOUT 1000

        /* Config PHY interface */
        portctrl = fsl_readl(&dr_regs->portsc1);
        portctrl &= ~(PORTSCX_PHY_TYPE_SEL | PORTSCX_PORT_WIDTH);
        switch (udc->phy_mode) {
        case FSL_USB2_PHY_ULPI:
                if (udc->pdata->have_sysif_regs) {
                        if (udc->pdata->controller_ver) {
                                /* controller version 1.6 or above */
                                ctrl = __raw_readl(&usb_sys_regs->control);
                                ctrl &= ~USB_CTRL_UTMI_PHY_EN;
                                ctrl |= USB_CTRL_USB_EN;
                                __raw_writel(ctrl, &usb_sys_regs->control);
                        }
                }
                portctrl |= PORTSCX_PTS_ULPI;
                break;
        case FSL_USB2_PHY_UTMI_WIDE:
                portctrl |= PORTSCX_PTW_16BIT;
                fallthrough;
        case FSL_USB2_PHY_UTMI:
        case FSL_USB2_PHY_UTMI_DUAL:
                if (udc->pdata->have_sysif_regs) {
                        if (udc->pdata->controller_ver) {
                                /* controller version 1.6 or above */
                                ctrl = __raw_readl(&usb_sys_regs->control);
                                ctrl |= (USB_CTRL_UTMI_PHY_EN |
                                        USB_CTRL_USB_EN);
                                __raw_writel(ctrl, &usb_sys_regs->control);
                                mdelay(FSL_UTMI_PHY_DLY); /* Delay for UTMI
                                        PHY CLK to become stable - 10ms*/
                        }
                }
                portctrl |= PORTSCX_PTS_UTMI;
                break;
        case FSL_USB2_PHY_SERIAL:
                portctrl |= PORTSCX_PTS_FSLS;
                break;
        default:
                return -EINVAL;
        }
        fsl_writel(portctrl, &dr_regs->portsc1);

        /* Stop and reset the usb controller */
        tmp = fsl_readl(&dr_regs->usbcmd);
        tmp &= ~USB_CMD_RUN_STOP;
        fsl_writel(tmp, &dr_regs->usbcmd);

        tmp = fsl_readl(&dr_regs->usbcmd);
        tmp |= USB_CMD_CTRL_RESET;
        fsl_writel(tmp, &dr_regs->usbcmd);

        /* Wait for reset to complete */
        timeout = jiffies + FSL_UDC_RESET_TIMEOUT;
        while (fsl_readl(&dr_regs->usbcmd) & USB_CMD_CTRL_RESET) {
                if (time_after(jiffies, timeout)) {
                        dev_err(&udc->gadget.dev, "udc reset timeout!\n");
                        return -ETIMEDOUT;
                }
                cpu_relax();
        }

        /* Set the controller as device mode */
        tmp = fsl_readl(&dr_regs->usbmode);
        tmp &= ~USB_MODE_CTRL_MODE_MASK;        /* clear mode bits */
        tmp |= USB_MODE_CTRL_MODE_DEVICE;
        /* Disable Setup Lockout */
        tmp |= USB_MODE_SETUP_LOCK_OFF;
        if (udc->pdata->es)
                tmp |= USB_MODE_ES;
        fsl_writel(tmp, &dr_regs->usbmode);

        /* Clear the setup status */
        fsl_writel(0, &dr_regs->usbsts);

        tmp = udc->ep_qh_dma;
        tmp &= USB_EP_LIST_ADDRESS_MASK;
        fsl_writel(tmp, &dr_regs->endpointlistaddr);

        dev_vdbg(&udc->gadget.dev,
                 "vir[qh_base] is %p phy[qh_base] is 0x%8x reg is 0x%8x\n",
                 udc->ep_qh, (int)tmp,
                 fsl_readl(&dr_regs->endpointlistaddr));

        max_no_of_ep = (0x0000001F & fsl_readl(&dr_regs->dccparams));
        for (ep_num = 1; ep_num < max_no_of_ep; ep_num++) {
                tmp = fsl_readl(&dr_regs->endptctrl[ep_num]);
                tmp &= ~(EPCTRL_TX_TYPE | EPCTRL_RX_TYPE);
                tmp |= (EPCTRL_EP_TYPE_BULK << EPCTRL_TX_EP_TYPE_SHIFT)
                | (EPCTRL_EP_TYPE_BULK << EPCTRL_RX_EP_TYPE_SHIFT);
                fsl_writel(tmp, &dr_regs->endptctrl[ep_num]);
        }
        /* Config control enable i/o output, cpu endian register */
        if (udc->pdata->have_sysif_regs) {
                ctrl = __raw_readl(&usb_sys_regs->control);
                ctrl |= USB_CTRL_IOENB;
                __raw_writel(ctrl, &usb_sys_regs->control);
        }

#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
        /* Turn on cache snooping hardware, since some PowerPC platforms
         * wholly rely on hardware to deal with cache coherent. */

        if (udc->pdata->have_sysif_regs) {
                /* Setup Snooping for all the 4GB space */
                tmp = SNOOP_SIZE_2GB;   /* starts from 0x0, size 2G */
                __raw_writel(tmp, &usb_sys_regs->snoop1);
                tmp |= 0x80000000;      /* starts from 0x8000000, size 2G */
                __raw_writel(tmp, &usb_sys_regs->snoop2);
        }
#endif

        return 0;
}

/* Enable DR irq and set controller to run state */
static void dr_controller_run(struct fsl_udc *udc)
{
        u32 temp;

        /* Enable DR irq reg */
        temp = USB_INTR_INT_EN | USB_INTR_ERR_INT_EN
                | USB_INTR_PTC_DETECT_EN | USB_INTR_RESET_EN
                | USB_INTR_DEVICE_SUSPEND | USB_INTR_SYS_ERR_EN;

        fsl_writel(temp, &dr_regs->usbintr);

        /* Clear stopped bit */
        udc->stopped = 0;

        /* Set the controller as device mode */
        temp = fsl_readl(&dr_regs->usbmode);
        temp |= USB_MODE_CTRL_MODE_DEVICE;
        fsl_writel(temp, &dr_regs->usbmode);

        /* Set controller to Run */
        temp = fsl_readl(&dr_regs->usbcmd);
        temp |= USB_CMD_RUN_STOP;
        fsl_writel(temp, &dr_regs->usbcmd);
}

static void dr_controller_stop(struct fsl_udc *udc)
{
        unsigned int tmp;

        pr_debug("%s\n", __func__);

        /* if we're in OTG mode, and the Host is currently using the port,
         * stop now and don't rip the controller out from under the
         * ehci driver
         */
        if (udc->gadget.is_otg) {
                if (!(fsl_readl(&dr_regs->otgsc) & OTGSC_STS_USB_ID)) {
                        pr_debug("udc: Leaving early\n");
                        return;
                }
        }

        /* disable all INTR */
        fsl_writel(0, &dr_regs->usbintr);

        /* Set stopped bit for isr */
        udc->stopped = 1;

        /* disable IO output */
/*      usb_sys_regs->control = 0; */

        /* set controller to Stop */
        tmp = fsl_readl(&dr_regs->usbcmd);
        tmp &= ~USB_CMD_RUN_STOP;
        fsl_writel(tmp, &dr_regs->usbcmd);
}

static void dr_ep_setup(unsigned char ep_num, unsigned char dir,
                        unsigned char ep_type)
{
        unsigned int tmp_epctrl = 0;

        tmp_epctrl = fsl_readl(&dr_regs->endptctrl[ep_num]);
        if (dir) {
                if (ep_num)
                        tmp_epctrl |= EPCTRL_TX_DATA_TOGGLE_RST;
                tmp_epctrl |= EPCTRL_TX_ENABLE;
                tmp_epctrl &= ~EPCTRL_TX_TYPE;
                tmp_epctrl |= ((unsigned int)(ep_type)
                                << EPCTRL_TX_EP_TYPE_SHIFT);
        } else {
                if (ep_num)
                        tmp_epctrl |= EPCTRL_RX_DATA_TOGGLE_RST;
                tmp_epctrl |= EPCTRL_RX_ENABLE;
                tmp_epctrl &= ~EPCTRL_RX_TYPE;
                tmp_epctrl |= ((unsigned int)(ep_type)
                                << EPCTRL_RX_EP_TYPE_SHIFT);
        }

        fsl_writel(tmp_epctrl, &dr_regs->endptctrl[ep_num]);
}

static void
dr_ep_change_stall(unsigned char ep_num, unsigned char dir, int value)
{
        u32 tmp_epctrl = 0;

        tmp_epctrl = fsl_readl(&dr_regs->endptctrl[ep_num]);

        if (value) {
                /* set the stall bit */
                if (dir)
                        tmp_epctrl |= EPCTRL_TX_EP_STALL;
                else
                        tmp_epctrl |= EPCTRL_RX_EP_STALL;
        } else {
                /* clear the stall bit and reset data toggle */
                if (dir) {
                        tmp_epctrl &= ~EPCTRL_TX_EP_STALL;
                        tmp_epctrl |= EPCTRL_TX_DATA_TOGGLE_RST;
                } else {
                        tmp_epctrl &= ~EPCTRL_RX_EP_STALL;
                        tmp_epctrl |= EPCTRL_RX_DATA_TOGGLE_RST;
                }
        }
        fsl_writel(tmp_epctrl, &dr_regs->endptctrl[ep_num]);
}

/* Get stall status of a specific ep
   Return: 0: not stalled; 1:stalled */
static int dr_ep_get_stall(unsigned char ep_num, unsigned char dir)
{
        u32 epctrl;

        epctrl = fsl_readl(&dr_regs->endptctrl[ep_num]);
        if (dir)
                return (epctrl & EPCTRL_TX_EP_STALL) ? 1 : 0;
        else
                return (epctrl & EPCTRL_RX_EP_STALL) ? 1 : 0;
}

/********************************************************************
        Internal Structure Build up functions
********************************************************************/

/*------------------------------------------------------------------
* struct_ep_qh_setup(): set the Endpoint Capabilites field of QH
 * @zlt: Zero Length Termination Select (1: disable; 0: enable)
 * @mult: Mult field
 ------------------------------------------------------------------*/
static void struct_ep_qh_setup(struct fsl_udc *udc, unsigned char ep_num,
                unsigned char dir, unsigned char ep_type,
                unsigned int max_pkt_len,
                unsigned int zlt, unsigned char mult)
{
        struct ep_queue_head *p_QH = &udc->ep_qh[2 * ep_num + dir];
        unsigned int tmp = 0;

        /* set the Endpoint Capabilites in QH */
        switch (ep_type) {
        case USB_ENDPOINT_XFER_CONTROL:
                /* Interrupt On Setup (IOS). for control ep  */
                tmp = (max_pkt_len << EP_QUEUE_HEAD_MAX_PKT_LEN_POS)
                        | EP_QUEUE_HEAD_IOS;
                break;
        case USB_ENDPOINT_XFER_ISOC:
                tmp = (max_pkt_len << EP_QUEUE_HEAD_MAX_PKT_LEN_POS)
                        | (mult << EP_QUEUE_HEAD_MULT_POS);
                break;
        case USB_ENDPOINT_XFER_BULK:
        case USB_ENDPOINT_XFER_INT:
                tmp = max_pkt_len << EP_QUEUE_HEAD_MAX_PKT_LEN_POS;
                break;
        default:
                dev_vdbg(&udc->gadget.dev, "error ep type is %d\n", ep_type);
                return;
        }
        if (zlt)
                tmp |= EP_QUEUE_HEAD_ZLT_SEL;

        p_QH->max_pkt_length = cpu_to_hc32(tmp);
        p_QH->next_dtd_ptr = 1;
        p_QH->size_ioc_int_sts = 0;
}

/* Setup qh structure and ep register for ep0. */
static void ep0_setup(struct fsl_udc *udc)
{
        /* the initialization of an ep includes: fields in QH, Regs,
         * fsl_ep struct */
        struct_ep_qh_setup(udc, 0, USB_RECV, USB_ENDPOINT_XFER_CONTROL,
                        USB_MAX_CTRL_PAYLOAD, 0, 0);
        struct_ep_qh_setup(udc, 0, USB_SEND, USB_ENDPOINT_XFER_CONTROL,
                        USB_MAX_CTRL_PAYLOAD, 0, 0);
        dr_ep_setup(0, USB_RECV, USB_ENDPOINT_XFER_CONTROL);
        dr_ep_setup(0, USB_SEND, USB_ENDPOINT_XFER_CONTROL);

        return;

}

/***********************************************************************
                Endpoint Management Functions
***********************************************************************/

/*-------------------------------------------------------------------------
 * when configurations are set, or when interface settings change
 * for example the do_set_interface() in gadget layer,
 * the driver will enable or disable the relevant endpoints
 * ep0 doesn't use this routine. It is always enabled.
-------------------------------------------------------------------------*/
static int fsl_ep_enable(struct usb_ep *_ep,
                const struct usb_endpoint_descriptor *desc)
{
        struct fsl_udc *udc = NULL;
        struct fsl_ep *ep = NULL;
        unsigned short max = 0;
        unsigned char mult = 0, zlt;
        int retval = -EINVAL;
        unsigned long flags;

        ep = container_of(_ep, struct fsl_ep, ep);

        /* catch various bogus parameters */
        if (!_ep || !desc
                        || (desc->bDescriptorType != USB_DT_ENDPOINT))
                return -EINVAL;

        udc = ep->udc;

        if (!udc->driver || (udc->gadget.speed == USB_SPEED_UNKNOWN))
                return -ESHUTDOWN;

        max = usb_endpoint_maxp(desc);

        /* Disable automatic zlp generation.  Driver is responsible to indicate
         * explicitly through req->req.zero.  This is needed to enable multi-td
         * request. */
        zlt = 1;

        /* Assume the max packet size from gadget is always correct */
        switch (desc->bmAttributes & 0x03) {
        case USB_ENDPOINT_XFER_CONTROL:
        case USB_ENDPOINT_XFER_BULK:
        case USB_ENDPOINT_XFER_INT:
                /* mult = 0.  Execute N Transactions as demonstrated by
                 * the USB variable length packet protocol where N is
                 * computed using the Maximum Packet Length (dQH) and
                 * the Total Bytes field (dTD) */
                mult = 0;
                break;
        case USB_ENDPOINT_XFER_ISOC:
                /* Calculate transactions needed for high bandwidth iso */
                mult = usb_endpoint_maxp_mult(desc);
                /* 3 transactions at most */
                if (mult > 3)
                        goto en_done;
                break;
        default:
                goto en_done;
        }

        spin_lock_irqsave(&udc->lock, flags);
        ep->ep.maxpacket = max;
        ep->ep.desc = desc;
        ep->stopped = 0;

        /* Controller related setup */
        /* Init EPx Queue Head (Ep Capabilites field in QH
         * according to max, zlt, mult) */
        struct_ep_qh_setup(udc, (unsigned char) ep_index(ep),
                        (unsigned char) ((desc->bEndpointAddress & USB_DIR_IN)
                                        ?  USB_SEND : USB_RECV),
                        (unsigned char) (desc->bmAttributes
                                        & USB_ENDPOINT_XFERTYPE_MASK),
                        max, zlt, mult);

        /* Init endpoint ctrl register */
        dr_ep_setup((unsigned char) ep_index(ep),
                        (unsigned char) ((desc->bEndpointAddress & USB_DIR_IN)
                                        ? USB_SEND : USB_RECV),
                        (unsigned char) (desc->bmAttributes
                                        & USB_ENDPOINT_XFERTYPE_MASK));

        spin_unlock_irqrestore(&udc->lock, flags);
        retval = 0;

        dev_vdbg(&udc->gadget.dev, "enabled %s (ep%d%s) maxpacket %d\n",
                 ep->ep.name, ep->ep.desc->bEndpointAddress & 0x0f,
                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
                 max);
en_done:
        return retval;
}

/*---------------------------------------------------------------------
 * @ep : the ep being unconfigured. May not be ep0
 * Any pending and uncomplete req will complete with status (-ESHUTDOWN)
*---------------------------------------------------------------------*/
static int fsl_ep_disable(struct usb_ep *_ep)
{
        struct fsl_udc *udc = NULL;
        struct fsl_ep *ep = NULL;
        unsigned long flags;
        u32 epctrl;
        int ep_num;

        ep = container_of(_ep, struct fsl_ep, ep);
        if (!_ep || !ep->ep.desc) {
                /*
                 * dev_vdbg(&udc->gadget.dev, "%s not enabled\n",
                 *       _ep ? ep->ep.name : NULL);
                 */
                return -EINVAL;
        }

        /* disable ep on controller */
        ep_num = ep_index(ep);
        epctrl = fsl_readl(&dr_regs->endptctrl[ep_num]);
        if (ep_is_in(ep)) {
                epctrl &= ~(EPCTRL_TX_ENABLE | EPCTRL_TX_TYPE);
                epctrl |= EPCTRL_EP_TYPE_BULK << EPCTRL_TX_EP_TYPE_SHIFT;
        } else {
                epctrl &= ~(EPCTRL_RX_ENABLE | EPCTRL_TX_TYPE);
                epctrl |= EPCTRL_EP_TYPE_BULK << EPCTRL_RX_EP_TYPE_SHIFT;
        }
        fsl_writel(epctrl, &dr_regs->endptctrl[ep_num]);

        udc = (struct fsl_udc *)ep->udc;
        spin_lock_irqsave(&udc->lock, flags);

        /* nuke all pending requests (does flush) */
        nuke(ep, -ESHUTDOWN);

        ep->ep.desc = NULL;
        ep->stopped = 1;
        spin_unlock_irqrestore(&udc->lock, flags);

        dev_vdbg(&udc->gadget.dev, "disabled %s OK\n", _ep->name);
        return 0;
}

/*---------------------------------------------------------------------
 * allocate a request object used by this endpoint
 * the main operation is to insert the req->queue to the eq->queue
 * Returns the request, or null if one could not be allocated
*---------------------------------------------------------------------*/
static struct usb_request *
fsl_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
{
        struct fsl_req *req;

        req = kzalloc_obj(*req, gfp_flags);
        if (!req)
                return NULL;

        req->req.dma = DMA_ADDR_INVALID;
        INIT_LIST_HEAD(&req->queue);

        return &req->req;
}

static void fsl_free_request(struct usb_ep *_ep, struct usb_request *_req)
{
        struct fsl_req *req = NULL;

        req = container_of(_req, struct fsl_req, req);

        if (_req)
                kfree(req);
}

/* Actually add a dTD chain to an empty dQH and let go */
static void fsl_prime_ep(struct fsl_ep *ep, struct ep_td_struct *td)
{
        struct ep_queue_head *qh = get_qh_by_ep(ep);

        /* Write dQH next pointer and terminate bit to 0 */
        qh->next_dtd_ptr = cpu_to_hc32(td->td_dma
                        & EP_QUEUE_HEAD_NEXT_POINTER_MASK);

        /* Clear active and halt bit */
        qh->size_ioc_int_sts &= cpu_to_hc32(~(EP_QUEUE_HEAD_STATUS_ACTIVE
                                        | EP_QUEUE_HEAD_STATUS_HALT));

        /* Ensure that updates to the QH will occur before priming. */
        wmb();

        /* Prime endpoint by writing correct bit to ENDPTPRIME */
        fsl_writel(ep_is_in(ep) ? (1 << (ep_index(ep) + 16))
                        : (1 << (ep_index(ep))), &dr_regs->endpointprime);
}

/* Add dTD chain to the dQH of an EP */
static void fsl_queue_td(struct fsl_ep *ep, struct fsl_req *req)
{
        u32 temp, bitmask, tmp_stat;

        /* dev_vdbg(&udc->gadget.dev, "QH addr Register 0x%8x\n", dr_regs->endpointlistaddr);
        dev_vdbg(&udc->gadget.dev, "ep_qh[%d] addr is 0x%8x\n", i, (u32)&(ep->udc->ep_qh[i])); */

        bitmask = ep_is_in(ep)
                ? (1 << (ep_index(ep) + 16))
                : (1 << (ep_index(ep)));

        /* check if the pipe is empty */
        if (!(list_empty(&ep->queue)) && !(ep_index(ep) == 0)) {
                /* Add td to the end */
                struct fsl_req *lastreq;
                lastreq = list_entry(ep->queue.prev, struct fsl_req, queue);
                lastreq->tail->next_td_ptr =
                        cpu_to_hc32(req->head->td_dma & DTD_ADDR_MASK);
                /* Ensure dTD's next dtd pointer to be updated */
                wmb();
                /* Read prime bit, if 1 goto done */
                if (fsl_readl(&dr_regs->endpointprime) & bitmask)
                        return;

                do {
                        /* Set ATDTW bit in USBCMD */
                        temp = fsl_readl(&dr_regs->usbcmd);
                        fsl_writel(temp | USB_CMD_ATDTW, &dr_regs->usbcmd);

                        /* Read correct status bit */
                        tmp_stat = fsl_readl(&dr_regs->endptstatus) & bitmask;

                } while (!(fsl_readl(&dr_regs->usbcmd) & USB_CMD_ATDTW));

                /* Write ATDTW bit to 0 */
                temp = fsl_readl(&dr_regs->usbcmd);
                fsl_writel(temp & ~USB_CMD_ATDTW, &dr_regs->usbcmd);

                if (tmp_stat)
                        return;
        }

        fsl_prime_ep(ep, req->head);
}

/* Fill in the dTD structure
 * @req: request that the transfer belongs to
 * @length: return actually data length of the dTD
 * @dma: return dma address of the dTD
 * @is_last: return flag if it is the last dTD of the request
 * return: pointer to the built dTD */
static struct ep_td_struct *fsl_build_dtd(struct fsl_req *req, unsigned *length,
                dma_addr_t *dma, int *is_last, gfp_t gfp_flags)
{
        u32 swap_temp;
        struct ep_td_struct *dtd;

        /* how big will this transfer be? */
        *length = min(req->req.length - req->req.actual,
                        (unsigned)EP_MAX_LENGTH_TRANSFER);

        dtd = dma_pool_alloc(udc_controller->td_pool, gfp_flags, dma);
        if (dtd == NULL)
                return dtd;

        dtd->td_dma = *dma;
        /* Clear reserved field */
        swap_temp = hc32_to_cpu(dtd->size_ioc_sts);
        swap_temp &= ~DTD_RESERVED_FIELDS;
        dtd->size_ioc_sts = cpu_to_hc32(swap_temp);

        /* Init all of buffer page pointers */
        swap_temp = (u32) (req->req.dma + req->req.actual);
        dtd->buff_ptr0 = cpu_to_hc32(swap_temp);
        dtd->buff_ptr1 = cpu_to_hc32(swap_temp + 0x1000);
        dtd->buff_ptr2 = cpu_to_hc32(swap_temp + 0x2000);
        dtd->buff_ptr3 = cpu_to_hc32(swap_temp + 0x3000);
        dtd->buff_ptr4 = cpu_to_hc32(swap_temp + 0x4000);

        req->req.actual += *length;

        /* zlp is needed if req->req.zero is set */
        if (req->req.zero) {
                if (*length == 0 || (*length % req->ep->ep.maxpacket) != 0)
                        *is_last = 1;
                else
                        *is_last = 0;
        } else if (req->req.length == req->req.actual)
                *is_last = 1;
        else
                *is_last = 0;

        if ((*is_last) == 0)
                dev_vdbg(&udc_controller->gadget.dev, "multi-dtd request!\n");
        /* Fill in the transfer size; set active bit */
        swap_temp = ((*length << DTD_LENGTH_BIT_POS) | DTD_STATUS_ACTIVE);

        /* Enable interrupt for the last dtd of a request */
        if (*is_last && !req->req.no_interrupt)
                swap_temp |= DTD_IOC;

        dtd->size_ioc_sts = cpu_to_hc32(swap_temp);

        mb();

        dev_vdbg(&udc_controller->gadget.dev, "length = %d address= 0x%x\n", *length, (int)*dma);

        return dtd;
}

/* Generate dtd chain for a request */
static int fsl_req_to_dtd(struct fsl_req *req, gfp_t gfp_flags)
{
        unsigned        count;
        int             is_last;
        int             is_first =1;
        struct ep_td_struct     *last_dtd = NULL, *dtd;
        dma_addr_t dma;

        do {
                dtd = fsl_build_dtd(req, &count, &dma, &is_last, gfp_flags);
                if (dtd == NULL)
                        return -ENOMEM;

                if (is_first) {
                        is_first = 0;
                        req->head = dtd;
                } else {
                        last_dtd->next_td_ptr = cpu_to_hc32(dma);
                        last_dtd->next_td_virt = dtd;
                }
                last_dtd = dtd;

                req->dtd_count++;
        } while (!is_last);

        dtd->next_td_ptr = cpu_to_hc32(DTD_NEXT_TERMINATE);

        req->tail = dtd;

        return 0;
}

/* queues (submits) an I/O request to an endpoint */
static int
fsl_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
{
        struct fsl_ep *ep = container_of(_ep, struct fsl_ep, ep);
        struct fsl_req *req = container_of(_req, struct fsl_req, req);
        struct fsl_udc *udc = ep->udc;
        unsigned long flags;
        int ret;

        /* catch various bogus parameters */
        if (!_req || !req->req.complete || !req->req.buf
                        || !list_empty(&req->queue)) {
                dev_vdbg(&udc->gadget.dev, "%s, bad params\n", __func__);
                return -EINVAL;
        }
        if (unlikely(!ep->ep.desc)) {
                dev_vdbg(&udc->gadget.dev, "%s, bad ep\n", __func__);
                return -EINVAL;
        }
        if (usb_endpoint_xfer_isoc(ep->ep.desc)) {
                if (req->req.length > ep->ep.maxpacket)
                        return -EMSGSIZE;
        }

        if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN)
                return -ESHUTDOWN;

        req->ep = ep;

        ret = usb_gadget_map_request(&ep->udc->gadget, &req->req, ep_is_in(ep));
        if (ret)
                return ret;

        req->req.status = -EINPROGRESS;
        req->req.actual = 0;
        req->dtd_count = 0;

        /* build dtds and push them to device queue */
        if (!fsl_req_to_dtd(req, gfp_flags)) {
                spin_lock_irqsave(&udc->lock, flags);
                fsl_queue_td(ep, req);
        } else {
                return -ENOMEM;
        }

        /* irq handler advances the queue */
        if (req != NULL)
                list_add_tail(&req->queue, &ep->queue);
        spin_unlock_irqrestore(&udc->lock, flags);

        return 0;
}

/* dequeues (cancels, unlinks) an I/O request from an endpoint */
static int fsl_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
        struct fsl_ep *ep = container_of(_ep, struct fsl_ep, ep);
        struct fsl_req *req = NULL;
        struct fsl_req *iter;
        unsigned long flags;
        int ep_num, stopped, ret = 0;
        u32 epctrl;

        if (!_ep || !_req)
                return -EINVAL;

        spin_lock_irqsave(&ep->udc->lock, flags);
        stopped = ep->stopped;

        /* Stop the ep before we deal with the queue */
        ep->stopped = 1;
        ep_num = ep_index(ep);
        epctrl = fsl_readl(&dr_regs->endptctrl[ep_num]);
        if (ep_is_in(ep))
                epctrl &= ~EPCTRL_TX_ENABLE;
        else
                epctrl &= ~EPCTRL_RX_ENABLE;
        fsl_writel(epctrl, &dr_regs->endptctrl[ep_num]);

        /* make sure it's actually queued on this endpoint */
        list_for_each_entry(iter, &ep->queue, queue) {
                if (&iter->req != _req)
                        continue;
                req = iter;
                break;
        }
        if (!req) {
                ret = -EINVAL;
                goto out;
        }

        /* The request is in progress, or completed but not dequeued */
        if (ep->queue.next == &req->queue) {
                _req->status = -ECONNRESET;
                fsl_ep_fifo_flush(_ep); /* flush current transfer */

                /* The request isn't the last request in this ep queue */
                if (req->queue.next != &ep->queue) {
                        struct fsl_req *next_req;

                        next_req = list_entry(req->queue.next, struct fsl_req,
                                        queue);

                        /* prime with dTD of next request */
                        fsl_prime_ep(ep, next_req->head);
                }
        /* The request hasn't been processed, patch up the TD chain */
        } else {
                struct fsl_req *prev_req;

                prev_req = list_entry(req->queue.prev, struct fsl_req, queue);
                prev_req->tail->next_td_ptr = req->tail->next_td_ptr;
        }

        done(ep, req, -ECONNRESET);

        /* Enable EP */
out:    epctrl = fsl_readl(&dr_regs->endptctrl[ep_num]);
        if (ep_is_in(ep))
                epctrl |= EPCTRL_TX_ENABLE;
        else
                epctrl |= EPCTRL_RX_ENABLE;
        fsl_writel(epctrl, &dr_regs->endptctrl[ep_num]);
        ep->stopped = stopped;

        spin_unlock_irqrestore(&ep->udc->lock, flags);
        return ret;
}

/*-------------------------------------------------------------------------*/

/*-----------------------------------------------------------------
 * modify the endpoint halt feature
 * @ep: the non-isochronous endpoint being stalled
 * @value: 1--set halt  0--clear halt
 * Returns zero, or a negative error code.
*----------------------------------------------------------------*/
static int fsl_ep_set_halt(struct usb_ep *_ep, int value)
{
        struct fsl_ep *ep = NULL;
        unsigned long flags;
        int status = -EOPNOTSUPP;       /* operation not supported */
        unsigned char ep_dir = 0, ep_num = 0;
        struct fsl_udc *udc = NULL;

        ep = container_of(_ep, struct fsl_ep, ep);
        udc = ep->udc;
        if (!_ep || !ep->ep.desc) {
                status = -EINVAL;
                goto out;
        }

        if (usb_endpoint_xfer_isoc(ep->ep.desc)) {
                status = -EOPNOTSUPP;
                goto out;
        }

        /* Attempt to halt IN ep will fail if any transfer requests
         * are still queue */
        if (value && ep_is_in(ep) && !list_empty(&ep->queue)) {
                status = -EAGAIN;
                goto out;
        }

        status = 0;
        ep_dir = ep_is_in(ep) ? USB_SEND : USB_RECV;
        ep_num = (unsigned char)(ep_index(ep));
        spin_lock_irqsave(&ep->udc->lock, flags);
        dr_ep_change_stall(ep_num, ep_dir, value);
        spin_unlock_irqrestore(&ep->udc->lock, flags);

        if (ep_index(ep) == 0) {
                udc->ep0_state = WAIT_FOR_SETUP;
                udc->ep0_dir = 0;
        }
out:
        dev_vdbg(&udc->gadget.dev, "%s %s halt stat %d\n", ep->ep.name,
                 value ?  "set" : "clear", status);

        return status;
}

static int fsl_ep_fifo_status(struct usb_ep *_ep)
{
        struct fsl_ep *ep;
        struct fsl_udc *udc;
        int size = 0;
        u32 bitmask;
        struct ep_queue_head *qh;

        if (!_ep || !_ep->desc || !(_ep->desc->bEndpointAddress&0xF))
                return -ENODEV;

        ep = container_of(_ep, struct fsl_ep, ep);

        udc = (struct fsl_udc *)ep->udc;

        if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN)
                return -ESHUTDOWN;

        qh = get_qh_by_ep(ep);

        bitmask = (ep_is_in(ep)) ? (1 << (ep_index(ep) + 16)) :
            (1 << (ep_index(ep)));

        if (fsl_readl(&dr_regs->endptstatus) & bitmask)
                size = (qh->size_ioc_int_sts & DTD_PACKET_SIZE)
                    >> DTD_LENGTH_BIT_POS;

        pr_debug("%s %u\n", __func__, size);
        return size;
}

static void fsl_ep_fifo_flush(struct usb_ep *_ep)
{
        struct fsl_ep *ep;
        int ep_num, ep_dir;
        u32 bits;
        unsigned long timeout;
#define FSL_UDC_FLUSH_TIMEOUT 1000

        if (!_ep) {
                return;
        } else {
                ep = container_of(_ep, struct fsl_ep, ep);
                if (!ep->ep.desc)
                        return;
        }
        ep_num = ep_index(ep);
        ep_dir = ep_is_in(ep) ? USB_SEND : USB_RECV;

        if (ep_num == 0)
                bits = (1 << 16) | 1;
        else if (ep_dir == USB_SEND)
                bits = 1 << (16 + ep_num);
        else
                bits = 1 << ep_num;

        timeout = jiffies + FSL_UDC_FLUSH_TIMEOUT;
        do {
                fsl_writel(bits, &dr_regs->endptflush);

                /* Wait until flush complete */
                while (fsl_readl(&dr_regs->endptflush)) {
                        if (time_after(jiffies, timeout)) {
                                dev_err(&udc_controller->gadget.dev,
                                        "ep flush timeout\n");
                                return;
                        }
                        cpu_relax();
                }
                /* See if we need to flush again */
        } while (fsl_readl(&dr_regs->endptstatus) & bits);
}

static const struct usb_ep_ops fsl_ep_ops = {
        .enable = fsl_ep_enable,
        .disable = fsl_ep_disable,

        .alloc_request = fsl_alloc_request,
        .free_request = fsl_free_request,

        .queue = fsl_ep_queue,
        .dequeue = fsl_ep_dequeue,

        .set_halt = fsl_ep_set_halt,
        .fifo_status = fsl_ep_fifo_status,
        .fifo_flush = fsl_ep_fifo_flush,        /* flush fifo */
};

/*-------------------------------------------------------------------------
                Gadget Driver Layer Operations
-------------------------------------------------------------------------*/

/*----------------------------------------------------------------------
 * Get the current frame number (from DR frame_index Reg )
 *----------------------------------------------------------------------*/
static int fsl_get_frame(struct usb_gadget *gadget)
{
        return (int)(fsl_readl(&dr_regs->frindex) & USB_FRINDEX_MASKS);
}

/*-----------------------------------------------------------------------
 * Tries to wake up the host connected to this gadget
 -----------------------------------------------------------------------*/
static int fsl_wakeup(struct usb_gadget *gadget)
{
        struct fsl_udc *udc = container_of(gadget, struct fsl_udc, gadget);
        u32 portsc;

        /* Remote wakeup feature not enabled by host */
        if (!udc->remote_wakeup)
                return -ENOTSUPP;

        portsc = fsl_readl(&dr_regs->portsc1);
        /* not suspended? */
        if (!(portsc & PORTSCX_PORT_SUSPEND))
                return 0;
        /* trigger force resume */
        portsc |= PORTSCX_PORT_FORCE_RESUME;
        fsl_writel(portsc, &dr_regs->portsc1);
        return 0;
}

static int can_pullup(struct fsl_udc *udc)
{
        return udc->driver && udc->softconnect && udc->vbus_active;
}

/* Notify controller that VBUS is powered, Called by whatever
   detects VBUS sessions */
static int fsl_vbus_session(struct usb_gadget *gadget, int is_active)
{
        struct fsl_udc  *udc;
        unsigned long   flags;

        udc = container_of(gadget, struct fsl_udc, gadget);
        spin_lock_irqsave(&udc->lock, flags);
        dev_vdbg(&gadget->dev, "VBUS %s\n", str_on_off(is_active));
        udc->vbus_active = (is_active != 0);
        if (can_pullup(udc))
                fsl_writel((fsl_readl(&dr_regs->usbcmd) | USB_CMD_RUN_STOP),
                                &dr_regs->usbcmd);
        else
                fsl_writel((fsl_readl(&dr_regs->usbcmd) & ~USB_CMD_RUN_STOP),
                                &dr_regs->usbcmd);
        spin_unlock_irqrestore(&udc->lock, flags);
        return 0;
}

/* constrain controller's VBUS power usage
 * This call is used by gadget drivers during SET_CONFIGURATION calls,
 * reporting how much power the device may consume.  For example, this
 * could affect how quickly batteries are recharged.
 *
 * Returns zero on success, else negative errno.
 */
static int fsl_vbus_draw(struct usb_gadget *gadget, unsigned mA)
{
        struct fsl_udc *udc;

        udc = container_of(gadget, struct fsl_udc, gadget);
        if (!IS_ERR_OR_NULL(udc->transceiver))
                return usb_phy_set_power(udc->transceiver, mA);
        return -ENOTSUPP;
}

/* Change Data+ pullup status
 * this func is used by usb_gadget_connect/disconnect
 */
static int fsl_pullup(struct usb_gadget *gadget, int is_on)
{
        struct fsl_udc *udc;

        udc = container_of(gadget, struct fsl_udc, gadget);

        if (!udc->vbus_active)
                return -EOPNOTSUPP;

        udc->softconnect = (is_on != 0);
        if (can_pullup(udc))
                fsl_writel((fsl_readl(&dr_regs->usbcmd) | USB_CMD_RUN_STOP),
                                &dr_regs->usbcmd);
        else
                fsl_writel((fsl_readl(&dr_regs->usbcmd) & ~USB_CMD_RUN_STOP),
                                &dr_regs->usbcmd);

        return 0;
}

static int fsl_udc_start(struct usb_gadget *g,
                struct usb_gadget_driver *driver);
static int fsl_udc_stop(struct usb_gadget *g);

static const struct usb_gadget_ops fsl_gadget_ops = {
        .get_frame = fsl_get_frame,
        .wakeup = fsl_wakeup,
/*      .set_selfpowered = fsl_set_selfpowered, */ /* Always selfpowered */
        .vbus_session = fsl_vbus_session,
        .vbus_draw = fsl_vbus_draw,
        .pullup = fsl_pullup,
        .udc_start = fsl_udc_start,
        .udc_stop = fsl_udc_stop,
};

/*
 * Empty complete function used by this driver to fill in the req->complete
 * field when creating a request since the complete field is mandatory.
 */
static void fsl_noop_complete(struct usb_ep *ep, struct usb_request *req) { }

/* Set protocol stall on ep0, protocol stall will automatically be cleared
   on new transaction */
static void ep0stall(struct fsl_udc *udc)
{
        u32 tmp;

        /* must set tx and rx to stall at the same time */
        tmp = fsl_readl(&dr_regs->endptctrl[0]);
        tmp |= EPCTRL_TX_EP_STALL | EPCTRL_RX_EP_STALL;
        fsl_writel(tmp, &dr_regs->endptctrl[0]);
        udc->ep0_state = WAIT_FOR_SETUP;
        udc->ep0_dir = 0;
}

/* Prime a status phase for ep0 */
static int ep0_prime_status(struct fsl_udc *udc, int direction)
{
        struct fsl_req *req = udc->status_req;
        struct fsl_ep *ep;
        int ret;

        if (direction == EP_DIR_IN)
                udc->ep0_dir = USB_DIR_IN;
        else
                udc->ep0_dir = USB_DIR_OUT;

        ep = &udc->eps[0];
        if (udc->ep0_state != DATA_STATE_XMIT)
                udc->ep0_state = WAIT_FOR_OUT_STATUS;

        req->ep = ep;
        req->req.length = 0;
        req->req.status = -EINPROGRESS;
        req->req.actual = 0;
        req->req.complete = fsl_noop_complete;
        req->dtd_count = 0;

        ret = usb_gadget_map_request(&ep->udc->gadget, &req->req, ep_is_in(ep));
        if (ret)
                return ret;

        if (fsl_req_to_dtd(req, GFP_ATOMIC) == 0)
                fsl_queue_td(ep, req);
        else
                return -ENOMEM;

        list_add_tail(&req->queue, &ep->queue);

        return 0;
}

static void udc_reset_ep_queue(struct fsl_udc *udc, u8 pipe)
{
        struct fsl_ep *ep = get_ep_by_pipe(udc, pipe);

        if (ep->ep.name)
                nuke(ep, -ESHUTDOWN);
}

/*
 * ch9 Set address
 */
static void ch9setaddress(struct fsl_udc *udc, u16 value, u16 index, u16 length)
{
        /* Save the new address to device struct */
        udc->device_address = (u8) value;
        /* Update usb state */
        udc->usb_state = USB_STATE_ADDRESS;
        /* Status phase */
        if (ep0_prime_status(udc, EP_DIR_IN))
                ep0stall(udc);
}

/*
 * ch9 Get status
 */
static void ch9getstatus(struct fsl_udc *udc, u8 request_type, u16 value,
                u16 index, u16 length)
{
        u16 tmp = 0;            /* Status, cpu endian */
        struct fsl_req *req;
        struct fsl_ep *ep;
        int ret;

        ep = &udc->eps[0];

        if ((request_type & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
                /* Get device status */
                tmp = udc->gadget.is_selfpowered;
                tmp |= udc->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP;
        } else if ((request_type & USB_RECIP_MASK) == USB_RECIP_INTERFACE) {
                /* Get interface status */
                /* We don't have interface information in udc driver */
                tmp = 0;
        } else if ((request_type & USB_RECIP_MASK) == USB_RECIP_ENDPOINT) {
                /* Get endpoint status */
                struct fsl_ep *target_ep;

                target_ep = get_ep_by_pipe(udc, get_pipe_by_windex(index));

                /* stall if endpoint doesn't exist */
                if (!target_ep->ep.desc)
                        goto stall;
                tmp = dr_ep_get_stall(ep_index(target_ep), ep_is_in(target_ep))
                                << USB_ENDPOINT_HALT;
        }

        udc->ep0_dir = USB_DIR_IN;
        /* Borrow the per device status_req */
        req = udc->status_req;
        /* Fill in the request structure */
        *((u16 *) req->req.buf) = cpu_to_le16(tmp);

        req->ep = ep;
        req->req.length = 2;
        req->req.status = -EINPROGRESS;
        req->req.actual = 0;
        req->req.complete = fsl_noop_complete;
        req->dtd_count = 0;

        ret = usb_gadget_map_request(&ep->udc->gadget, &req->req, ep_is_in(ep));
        if (ret)
                goto stall;

        /* prime the data phase */
        if ((fsl_req_to_dtd(req, GFP_ATOMIC) == 0))
                fsl_queue_td(ep, req);
        else                    /* no mem */
                goto stall;

        list_add_tail(&req->queue, &ep->queue);
        udc->ep0_state = DATA_STATE_XMIT;
        if (ep0_prime_status(udc, EP_DIR_OUT))
                ep0stall(udc);

        return;
stall:
        ep0stall(udc);
}

static void setup_received_irq(struct fsl_udc *udc,
                struct usb_ctrlrequest *setup)
__releases(udc->lock)
__acquires(udc->lock)
{
        u16 wValue = le16_to_cpu(setup->wValue);
        u16 wIndex = le16_to_cpu(setup->wIndex);
        u16 wLength = le16_to_cpu(setup->wLength);

        udc_reset_ep_queue(udc, 0);

        /* We process some stardard setup requests here */
        switch (setup->bRequest) {
        case USB_REQ_GET_STATUS:
                /* Data+Status phase from udc */
                if ((setup->bRequestType & (USB_DIR_IN | USB_TYPE_MASK))
                                        != (USB_DIR_IN | USB_TYPE_STANDARD))
                        break;
                ch9getstatus(udc, setup->bRequestType, wValue, wIndex, wLength);
                return;

        case USB_REQ_SET_ADDRESS:
                /* Status phase from udc */
                if (setup->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD
                                                | USB_RECIP_DEVICE))
                        break;
                ch9setaddress(udc, wValue, wIndex, wLength);
                return;

        case USB_REQ_CLEAR_FEATURE:
        case USB_REQ_SET_FEATURE:
                /* Status phase from udc */
        {
                int rc = -EOPNOTSUPP;
                u16 ptc = 0;

                if ((setup->bRequestType & (USB_RECIP_MASK | USB_TYPE_MASK))
                                == (USB_RECIP_ENDPOINT | USB_TYPE_STANDARD)) {
                        int pipe = get_pipe_by_windex(wIndex);
                        struct fsl_ep *ep;

                        if (wValue != 0 || wLength != 0 || pipe >= udc->max_ep)
                                break;
                        ep = get_ep_by_pipe(udc, pipe);

                        spin_unlock(&udc->lock);
                        rc = fsl_ep_set_halt(&ep->ep,
                                        (setup->bRequest == USB_REQ_SET_FEATURE)
                                                ? 1 : 0);
                        spin_lock(&udc->lock);

                } else if ((setup->bRequestType & (USB_RECIP_MASK
                                | USB_TYPE_MASK)) == (USB_RECIP_DEVICE
                                | USB_TYPE_STANDARD)) {
                        /* Note: The driver has not include OTG support yet.
                         * This will be set when OTG support is added */
                        if (wValue == USB_DEVICE_TEST_MODE)
                                ptc = wIndex >> 8;
                        else if (gadget_is_otg(&udc->gadget)) {
                                if (setup->bRequest ==
                                    USB_DEVICE_B_HNP_ENABLE)
                                        udc->gadget.b_hnp_enable = 1;
                                else if (setup->bRequest ==
                                         USB_DEVICE_A_HNP_SUPPORT)
                                        udc->gadget.a_hnp_support = 1;
                                else if (setup->bRequest ==
                                         USB_DEVICE_A_ALT_HNP_SUPPORT)
                                        udc->gadget.a_alt_hnp_support = 1;
                        }
                        rc = 0;
                } else
                        break;

                if (rc == 0) {
                        if (ep0_prime_status(udc, EP_DIR_IN))
                                ep0stall(udc);
                }
                if (ptc) {
                        u32 tmp;

                        mdelay(10);
                        tmp = fsl_readl(&dr_regs->portsc1) | (ptc << 16);
                        fsl_writel(tmp, &dr_regs->portsc1);
                        printk(KERN_INFO "udc: switch to test mode %d.\n", ptc);
                }

                return;
        }

        default:
                break;
        }

        /* Requests handled by gadget */
        if (wLength) {
                /* Data phase from gadget, status phase from udc */
                udc->ep0_dir = (setup->bRequestType & USB_DIR_IN)
                                ?  USB_DIR_IN : USB_DIR_OUT;
                spin_unlock(&udc->lock);
                if (udc->driver->setup(&udc->gadget,
                                &udc->local_setup_buff) < 0)
                        ep0stall(udc);
                spin_lock(&udc->lock);
                udc->ep0_state = (setup->bRequestType & USB_DIR_IN)
                                ?  DATA_STATE_XMIT : DATA_STATE_RECV;
                /*
                 * If the data stage is IN, send status prime immediately.
                 * See 2.0 Spec chapter 8.5.3.3 for detail.
                 */
                if (udc->ep0_state == DATA_STATE_XMIT)
                        if (ep0_prime_status(udc, EP_DIR_OUT))
                                ep0stall(udc);

        } else {
                /* No data phase, IN status from gadget */
                udc->ep0_dir = USB_DIR_IN;
                spin_unlock(&udc->lock);
                if (udc->driver->setup(&udc->gadget,
                                &udc->local_setup_buff) < 0)
                        ep0stall(udc);
                spin_lock(&udc->lock);
                udc->ep0_state = WAIT_FOR_OUT_STATUS;
        }
}

/* Process request for Data or Status phase of ep0
 * prime status phase if needed */
static void ep0_req_complete(struct fsl_udc *udc, struct fsl_ep *ep0,
                struct fsl_req *req)
{
        if (udc->usb_state == USB_STATE_ADDRESS) {
                /* Set the new address */
                u32 new_address = (u32) udc->device_address;
                fsl_writel(new_address << USB_DEVICE_ADDRESS_BIT_POS,
                                &dr_regs->deviceaddr);
        }

        done(ep0, req, 0);

        switch (udc->ep0_state) {
        case DATA_STATE_XMIT:
                /* already primed at setup_received_irq */
                udc->ep0_state = WAIT_FOR_OUT_STATUS;
                break;
        case DATA_STATE_RECV:
                /* send status phase */
                if (ep0_prime_status(udc, EP_DIR_IN))
                        ep0stall(udc);
                break;
        case WAIT_FOR_OUT_STATUS:
                udc->ep0_state = WAIT_FOR_SETUP;
                break;
        case WAIT_FOR_SETUP:
                dev_err(&udc->gadget.dev, "Unexpected ep0 packets\n");
                break;
        default:
                ep0stall(udc);
                break;
        }
}

/* Tripwire mechanism to ensure a setup packet payload is extracted without
 * being corrupted by another incoming setup packet */
static void tripwire_handler(struct fsl_udc *udc, u8 ep_num, u8 *buffer_ptr)
{
        u32 temp;
        struct ep_queue_head *qh;
        struct fsl_usb2_platform_data *pdata = udc->pdata;

        qh = &udc->ep_qh[ep_num * 2 + EP_DIR_OUT];

        /* Clear bit in ENDPTSETUPSTAT */
        temp = fsl_readl(&dr_regs->endptsetupstat);
        fsl_writel(temp | (1 << ep_num), &dr_regs->endptsetupstat);

        /* while a hazard exists when setup package arrives */
        do {
                /* Set Setup Tripwire */
                temp = fsl_readl(&dr_regs->usbcmd);
                fsl_writel(temp | USB_CMD_SUTW, &dr_regs->usbcmd);

                /* Copy the setup packet to local buffer */
                if (pdata->le_setup_buf) {
                        u32 *p = (u32 *)buffer_ptr;
                        u32 *s = (u32 *)qh->setup_buffer;

                        /* Convert little endian setup buffer to CPU endian */
                        *p++ = le32_to_cpu(*s++);
                        *p = le32_to_cpu(*s);
                } else {
                        memcpy(buffer_ptr, (u8 *) qh->setup_buffer, 8);
                }
        } while (!(fsl_readl(&dr_regs->usbcmd) & USB_CMD_SUTW));

        /* Clear Setup Tripwire */
        temp = fsl_readl(&dr_regs->usbcmd);
        fsl_writel(temp & ~USB_CMD_SUTW, &dr_regs->usbcmd);
}

/* process-ep_req(): free the completed Tds for this req */
static int process_ep_req(struct fsl_udc *udc, int pipe,
                struct fsl_req *curr_req)
{
        struct ep_td_struct *curr_td;
        int     actual, remaining_length, j, tmp;
        int     status = 0;
        int     errors = 0;
        struct  ep_queue_head *curr_qh = &udc->ep_qh[pipe];
        int direction = pipe % 2;

        curr_td = curr_req->head;
        actual = curr_req->req.length;

        for (j = 0; j < curr_req->dtd_count; j++) {
                remaining_length = (hc32_to_cpu(curr_td->size_ioc_sts)
                                        & DTD_PACKET_SIZE)
                                >> DTD_LENGTH_BIT_POS;
                actual -= remaining_length;

                errors = hc32_to_cpu(curr_td->size_ioc_sts);
                if (errors & DTD_ERROR_MASK) {
                        if (errors & DTD_STATUS_HALTED) {
                                dev_err(&udc->gadget.dev, "dTD error %08x QH=%d\n", errors, pipe);
                                /* Clear the errors and Halt condition */
                                tmp = hc32_to_cpu(curr_qh->size_ioc_int_sts);
                                tmp &= ~errors;
                                curr_qh->size_ioc_int_sts = cpu_to_hc32(tmp);
                                status = -EPIPE;
                                /* FIXME: continue with next queued TD? */

                                break;
                        }
                        if (errors & DTD_STATUS_DATA_BUFF_ERR) {
                                dev_vdbg(&udc->gadget.dev, "Transfer overflow\n");
                                status = -EPROTO;
                                break;
                        } else if (errors & DTD_STATUS_TRANSACTION_ERR) {
                                dev_vdbg(&udc->gadget.dev, "ISO error\n");
                                status = -EILSEQ;
                                break;
                        } else
                                dev_err(&udc->gadget.dev,
                                        "Unknown error has occurred (0x%x)!\n",
                                        errors);

                } else if (hc32_to_cpu(curr_td->size_ioc_sts)
                                & DTD_STATUS_ACTIVE) {
                        dev_vdbg(&udc->gadget.dev, "Request not complete\n");
                        status = REQ_UNCOMPLETE;
                        return status;
                } else if (remaining_length) {
                        if (direction) {
                                dev_vdbg(&udc->gadget.dev,
                                         "Transmit dTD remaining length not zero\n");
                                status = -EPROTO;
                                break;
                        } else {
                                break;
                        }
                } else {
                        dev_vdbg(&udc->gadget.dev,
                                 "dTD transmitted successful\n");
                }

                if (j != curr_req->dtd_count - 1)
                        curr_td = (struct ep_td_struct *)curr_td->next_td_virt;
        }

        if (status)
                return status;

        curr_req->req.actual = actual;

        return 0;
}

/* Process a DTD completion interrupt */
static void dtd_complete_irq(struct fsl_udc *udc)
{
        u32 bit_pos;
        int i, ep_num, direction, bit_mask, status;
        struct fsl_ep *curr_ep;
        struct fsl_req *curr_req, *temp_req;

        /* Clear the bits in the register */
        bit_pos = fsl_readl(&dr_regs->endptcomplete);
        fsl_writel(bit_pos, &dr_regs->endptcomplete);

        if (!bit_pos)
                return;

        for (i = 0; i < udc->max_ep; i++) {
                ep_num = i >> 1;
                direction = i % 2;

                bit_mask = 1 << (ep_num + 16 * direction);

                if (!(bit_pos & bit_mask))
                        continue;

                curr_ep = get_ep_by_pipe(udc, i);

                /* If the ep is configured */
                if (!curr_ep->ep.name) {
                        dev_warn(&udc->gadget.dev, "Invalid EP?\n");
                        continue;
                }

                /* process the req queue until an uncomplete request */
                list_for_each_entry_safe(curr_req, temp_req, &curr_ep->queue,
                                queue) {
                        status = process_ep_req(udc, i, curr_req);

                        dev_vdbg(&udc->gadget.dev,
                                 "status of process_ep_req= %d, ep = %d\n",
                                 status, ep_num);
                        if (status == REQ_UNCOMPLETE)
                                break;
                        /* write back status to req */
                        curr_req->req.status = status;

                        if (ep_num == 0) {
                                ep0_req_complete(udc, curr_ep, curr_req);
                                break;
                        } else
                                done(curr_ep, curr_req, status);
                }
        }
}

static inline enum usb_device_speed portscx_device_speed(u32 reg)
{
        switch (reg & PORTSCX_PORT_SPEED_MASK) {
        case PORTSCX_PORT_SPEED_HIGH:
                return USB_SPEED_HIGH;
        case PORTSCX_PORT_SPEED_FULL:
                return USB_SPEED_FULL;
        case PORTSCX_PORT_SPEED_LOW:
                return USB_SPEED_LOW;
        default:
                return USB_SPEED_UNKNOWN;
        }
}

/* Process a port change interrupt */
static void port_change_irq(struct fsl_udc *udc)
{
        if (udc->bus_reset)
                udc->bus_reset = 0;

        /* Bus resetting is finished */
        if (!(fsl_readl(&dr_regs->portsc1) & PORTSCX_PORT_RESET))
                /* Get the speed */
                udc->gadget.speed =
                        portscx_device_speed(fsl_readl(&dr_regs->portsc1));

        /* Update USB state */
        if (!udc->resume_state)
                udc->usb_state = USB_STATE_DEFAULT;
}

/* Process suspend interrupt */
static void suspend_irq(struct fsl_udc *udc)
{
        udc->resume_state = udc->usb_state;
        udc->usb_state = USB_STATE_SUSPENDED;

        /* report suspend to the driver, serial.c does not support this */
        if (udc->driver->suspend)
                udc->driver->suspend(&udc->gadget);
}

static void bus_resume(struct fsl_udc *udc)
{
        udc->usb_state = udc->resume_state;
        udc->resume_state = 0;

        /* report resume to the driver, serial.c does not support this */
        if (udc->driver->resume)
                udc->driver->resume(&udc->gadget);
}

/* Clear up all ep queues */
static int reset_queues(struct fsl_udc *udc, bool bus_reset)
{
        u8 pipe;

        for (pipe = 0; pipe < udc->max_pipes; pipe++)
                udc_reset_ep_queue(udc, pipe);

        /* report disconnect; the driver is already quiesced */
        spin_unlock(&udc->lock);
        if (bus_reset)
                usb_gadget_udc_reset(&udc->gadget, udc->driver);
        else
                udc->driver->disconnect(&udc->gadget);
        spin_lock(&udc->lock);

        return 0;
}

/* Process reset interrupt */
static void reset_irq(struct fsl_udc *udc)
{
        u32 temp;
        unsigned long timeout;

        /* Clear the device address */
        temp = fsl_readl(&dr_regs->deviceaddr);
        fsl_writel(temp & ~USB_DEVICE_ADDRESS_MASK, &dr_regs->deviceaddr);

        udc->device_address = 0;

        /* Clear usb state */
        udc->resume_state = 0;
        udc->ep0_dir = 0;
        udc->ep0_state = WAIT_FOR_SETUP;
        udc->remote_wakeup = 0; /* default to 0 on reset */
        udc->gadget.b_hnp_enable = 0;
        udc->gadget.a_hnp_support = 0;
        udc->gadget.a_alt_hnp_support = 0;

        /* Clear all the setup token semaphores */
        temp = fsl_readl(&dr_regs->endptsetupstat);
        fsl_writel(temp, &dr_regs->endptsetupstat);

        /* Clear all the endpoint complete status bits */
        temp = fsl_readl(&dr_regs->endptcomplete);
        fsl_writel(temp, &dr_regs->endptcomplete);

        timeout = jiffies + 100;
        while (fsl_readl(&dr_regs->endpointprime)) {
                /* Wait until all endptprime bits cleared */
                if (time_after(jiffies, timeout)) {
                        dev_err(&udc->gadget.dev, "Timeout for reset\n");
                        break;
                }
                cpu_relax();
        }

        /* Write 1s to the flush register */
        fsl_writel(0xffffffff, &dr_regs->endptflush);

        if (fsl_readl(&dr_regs->portsc1) & PORTSCX_PORT_RESET) {
                dev_vdbg(&udc->gadget.dev, "Bus reset\n");
                /* Bus is reseting */
                udc->bus_reset = 1;
                /* Reset all the queues, include XD, dTD, EP queue
                 * head and TR Queue */
                reset_queues(udc, true);
                udc->usb_state = USB_STATE_DEFAULT;
        } else {
                dev_vdbg(&udc->gadget.dev, "Controller reset\n");
                /* initialize usb hw reg except for regs for EP, not
                 * touch usbintr reg */
                dr_controller_setup(udc);

                /* Reset all internal used Queues */
                reset_queues(udc, false);

                ep0_setup(udc);

                /* Enable DR IRQ reg, Set Run bit, change udc state */
                dr_controller_run(udc);
                udc->usb_state = USB_STATE_ATTACHED;
        }
}

/*
 * USB device controller interrupt handler
 */
static irqreturn_t fsl_udc_irq(int irq, void *_udc)
{
        struct fsl_udc *udc = _udc;
        u32 irq_src;
        irqreturn_t status = IRQ_NONE;
        unsigned long flags;

        /* Disable ISR for OTG host mode */
        if (udc->stopped)
                return IRQ_NONE;
        spin_lock_irqsave(&udc->lock, flags);
        irq_src = fsl_readl(&dr_regs->usbsts) & fsl_readl(&dr_regs->usbintr);
        /* Clear notification bits */
        fsl_writel(irq_src, &dr_regs->usbsts);

        /* dev_vdbg(&udc->gadget.dev, "irq_src [0x%8x]", irq_src); */

        /* Need to resume? */
        if (udc->usb_state == USB_STATE_SUSPENDED)
                if ((fsl_readl(&dr_regs->portsc1) & PORTSCX_PORT_SUSPEND) == 0)
                        bus_resume(udc);

        /* USB Interrupt */
        if (irq_src & USB_STS_INT) {
                dev_vdbg(&udc->gadget.dev, "Packet int\n");
                /* Setup package, we only support ep0 as control ep */
                if (fsl_readl(&dr_regs->endptsetupstat) & EP_SETUP_STATUS_EP0) {
                        tripwire_handler(udc, 0,
                                        (u8 *) (&udc->local_setup_buff));
                        setup_received_irq(udc, &udc->local_setup_buff);
                        status = IRQ_HANDLED;
                }

                /* completion of dtd */
                if (fsl_readl(&dr_regs->endptcomplete)) {
                        dtd_complete_irq(udc);
                        status = IRQ_HANDLED;
                }
        }

        /* SOF (for ISO transfer) */
        if (irq_src & USB_STS_SOF) {
                status = IRQ_HANDLED;
        }

        /* Port Change */
        if (irq_src & USB_STS_PORT_CHANGE) {
                port_change_irq(udc);
                status = IRQ_HANDLED;
        }

        /* Reset Received */
        if (irq_src & USB_STS_RESET) {
                dev_vdbg(&udc->gadget.dev, "reset int\n");
                reset_irq(udc);
                status = IRQ_HANDLED;
        }

        /* Sleep Enable (Suspend) */
        if (irq_src & USB_STS_SUSPEND) {
                suspend_irq(udc);
                status = IRQ_HANDLED;
        }

        if (irq_src & (USB_STS_ERR | USB_STS_SYS_ERR)) {
                dev_vdbg(&udc->gadget.dev, "Error IRQ %x\n", irq_src);
        }

        spin_unlock_irqrestore(&udc->lock, flags);
        return status;
}

/*----------------------------------------------------------------*
 * Hook to gadget drivers
 * Called by initialization code of gadget drivers
*----------------------------------------------------------------*/
static int fsl_udc_start(struct usb_gadget *g,
                struct usb_gadget_driver *driver)
{
        int retval = 0;
        unsigned long flags;

        /* lock is needed but whether should use this lock or another */
        spin_lock_irqsave(&udc_controller->lock, flags);

        /* hook up the driver */
        udc_controller->driver = driver;
        spin_unlock_irqrestore(&udc_controller->lock, flags);
        g->is_selfpowered = 1;

        if (!IS_ERR_OR_NULL(udc_controller->transceiver)) {
                /* Suspend the controller until OTG enable it */
                udc_controller->stopped = 1;
                printk(KERN_INFO "Suspend udc for OTG auto detect\n");

                /* connect to bus through transceiver */
                if (!IS_ERR_OR_NULL(udc_controller->transceiver)) {
                        retval = otg_set_peripheral(
                                        udc_controller->transceiver->otg,
                                                    &udc_controller->gadget);
                        if (retval < 0) {
                                dev_err(&udc_controller->gadget.dev, "can't bind to transceiver\n");
                                udc_controller->driver = NULL;
                                return retval;
                        }
                }
        } else {
                /* Enable DR IRQ reg and set USBCMD reg Run bit */
                dr_controller_run(udc_controller);
                udc_controller->usb_state = USB_STATE_ATTACHED;
                udc_controller->ep0_state = WAIT_FOR_SETUP;
                udc_controller->ep0_dir = 0;
        }

        return retval;
}

/* Disconnect from gadget driver */
static int fsl_udc_stop(struct usb_gadget *g)
{
        struct fsl_ep *loop_ep;
        unsigned long flags;

        if (!IS_ERR_OR_NULL(udc_controller->transceiver))
                otg_set_peripheral(udc_controller->transceiver->otg, NULL);

        /* stop DR, disable intr */
        dr_controller_stop(udc_controller);

        /* in fact, no needed */
        udc_controller->usb_state = USB_STATE_ATTACHED;
        udc_controller->ep0_state = WAIT_FOR_SETUP;
        udc_controller->ep0_dir = 0;

        /* stand operation */
        spin_lock_irqsave(&udc_controller->lock, flags);
        udc_controller->gadget.speed = USB_SPEED_UNKNOWN;
        nuke(&udc_controller->eps[0], -ESHUTDOWN);
        list_for_each_entry(loop_ep, &udc_controller->gadget.ep_list,
                        ep.ep_list)
                nuke(loop_ep, -ESHUTDOWN);
        spin_unlock_irqrestore(&udc_controller->lock, flags);

        udc_controller->driver = NULL;

        return 0;
}

/*-------------------------------------------------------------------------
                PROC File System Support
-------------------------------------------------------------------------*/
#ifdef CONFIG_USB_GADGET_DEBUG_FILES

#include <linux/seq_file.h>

static const char proc_filename[] = "driver/fsl_usb2_udc";

static int fsl_proc_read(struct seq_file *m, void *v)
{
        unsigned long flags;
        int i;
        u32 tmp_reg;
        struct fsl_ep *ep = NULL;
        struct fsl_req *req;

        struct fsl_udc *udc = udc_controller;

        spin_lock_irqsave(&udc->lock, flags);

        /* ------basic driver information ---- */
        seq_printf(m,
                        DRIVER_DESC "\n"
                        "%s version: %s\n"
                        "Gadget driver: %s\n\n",
                        driver_name, DRIVER_VERSION,
                        udc->driver ? udc->driver->driver.name : "(none)");

        /* ------ DR Registers ----- */
        tmp_reg = fsl_readl(&dr_regs->usbcmd);
        seq_printf(m,
                        "USBCMD reg:\n"
                        "SetupTW: %d\n"
                        "Run/Stop: %s\n\n",
                        (tmp_reg & USB_CMD_SUTW) ? 1 : 0,
                        (tmp_reg & USB_CMD_RUN_STOP) ? "Run" : "Stop");

        tmp_reg = fsl_readl(&dr_regs->usbsts);
        seq_printf(m,
                        "USB Status Reg:\n"
                        "Dr Suspend: %d Reset Received: %d System Error: %s "
                        "USB Error Interrupt: %s\n\n",
                        (tmp_reg & USB_STS_SUSPEND) ? 1 : 0,
                        (tmp_reg & USB_STS_RESET) ? 1 : 0,
                        (tmp_reg & USB_STS_SYS_ERR) ? "Err" : "Normal",
                        (tmp_reg & USB_STS_ERR) ? "Err detected" : "No err");

        tmp_reg = fsl_readl(&dr_regs->usbintr);
        seq_printf(m,
                        "USB Interrupt Enable Reg:\n"
                        "Sleep Enable: %d SOF Received Enable: %d "
                        "Reset Enable: %d\n"
                        "System Error Enable: %d "
                        "Port Change Detected Enable: %d\n"
                        "USB Error Intr Enable: %d USB Intr Enable: %d\n\n",
                        (tmp_reg & USB_INTR_DEVICE_SUSPEND) ? 1 : 0,
                        (tmp_reg & USB_INTR_SOF_EN) ? 1 : 0,
                        (tmp_reg & USB_INTR_RESET_EN) ? 1 : 0,
                        (tmp_reg & USB_INTR_SYS_ERR_EN) ? 1 : 0,
                        (tmp_reg & USB_INTR_PTC_DETECT_EN) ? 1 : 0,
                        (tmp_reg & USB_INTR_ERR_INT_EN) ? 1 : 0,
                        (tmp_reg & USB_INTR_INT_EN) ? 1 : 0);

        tmp_reg = fsl_readl(&dr_regs->frindex);
        seq_printf(m,
                        "USB Frame Index Reg: Frame Number is 0x%x\n\n",
                        (tmp_reg & USB_FRINDEX_MASKS));

        tmp_reg = fsl_readl(&dr_regs->deviceaddr);
        seq_printf(m,
                        "USB Device Address Reg: Device Addr is 0x%x\n\n",
                        (tmp_reg & USB_DEVICE_ADDRESS_MASK));

        tmp_reg = fsl_readl(&dr_regs->endpointlistaddr);
        seq_printf(m,
                        "USB Endpoint List Address Reg: "
                        "Device Addr is 0x%x\n\n",
                        (tmp_reg & USB_EP_LIST_ADDRESS_MASK));

        tmp_reg = fsl_readl(&dr_regs->portsc1);
        seq_printf(m,
                "USB Port Status&Control Reg:\n"
                "Port Transceiver Type : %s Port Speed: %s\n"
                "PHY Low Power Suspend: %s Port Reset: %s "
                "Port Suspend Mode: %s\n"
                "Over-current Change: %s "
                "Port Enable/Disable Change: %s\n"
                "Port Enabled/Disabled: %s "
                "Current Connect Status: %s\n\n", ( {
                        const char *s;
                        switch (tmp_reg & PORTSCX_PTS_FSLS) {
                        case PORTSCX_PTS_UTMI:
                                s = "UTMI"; break;
                        case PORTSCX_PTS_ULPI:
                                s = "ULPI "; break;
                        case PORTSCX_PTS_FSLS:
                                s = "FS/LS Serial"; break;
                        default:
                                s = "None"; break;
                        }
                        s;} ),
                usb_speed_string(portscx_device_speed(tmp_reg)),
                (tmp_reg & PORTSCX_PHY_LOW_POWER_SPD) ?
                "Normal PHY mode" : "Low power mode",
                (tmp_reg & PORTSCX_PORT_RESET) ? "In Reset" :
                "Not in Reset",
                (tmp_reg & PORTSCX_PORT_SUSPEND) ? "In " : "Not in",
                (tmp_reg & PORTSCX_OVER_CURRENT_CHG) ? "Dected" :
                "No",
                (tmp_reg & PORTSCX_PORT_EN_DIS_CHANGE) ? "Disable" :
                "Not change",
                (tmp_reg & PORTSCX_PORT_ENABLE) ? "Enable" :
                "Not correct",
                (tmp_reg & PORTSCX_CURRENT_CONNECT_STATUS) ?
                "Attached" : "Not-Att");

        tmp_reg = fsl_readl(&dr_regs->usbmode);
        seq_printf(m,
                        "USB Mode Reg: Controller Mode is: %s\n\n", ( {
                                const char *s;
                                switch (tmp_reg & USB_MODE_CTRL_MODE_HOST) {
                                case USB_MODE_CTRL_MODE_IDLE:
                                        s = "Idle"; break;
                                case USB_MODE_CTRL_MODE_DEVICE:
                                        s = "Device Controller"; break;
                                case USB_MODE_CTRL_MODE_HOST:
                                        s = "Host Controller"; break;
                                default:
                                        s = "None"; break;
                                }
                                s;
                        } ));

        tmp_reg = fsl_readl(&dr_regs->endptsetupstat);
        seq_printf(m,
                        "Endpoint Setup Status Reg: SETUP on ep 0x%x\n\n",
                        (tmp_reg & EP_SETUP_STATUS_MASK));

        for (i = 0; i < udc->max_ep / 2; i++) {
                tmp_reg = fsl_readl(&dr_regs->endptctrl[i]);
                seq_printf(m, "EP Ctrl Reg [0x%x]: = [0x%x]\n", i, tmp_reg);
        }
        tmp_reg = fsl_readl(&dr_regs->endpointprime);
        seq_printf(m, "EP Prime Reg = [0x%x]\n\n", tmp_reg);

        if (udc->pdata->have_sysif_regs) {
                tmp_reg = usb_sys_regs->snoop1;
                seq_printf(m, "Snoop1 Reg : = [0x%x]\n\n", tmp_reg);

                tmp_reg = usb_sys_regs->control;
                seq_printf(m, "General Control Reg : = [0x%x]\n\n", tmp_reg);
        }

        /* ------fsl_udc, fsl_ep, fsl_request structure information ----- */
        ep = &udc->eps[0];
        seq_printf(m, "For %s Maxpkt is 0x%x index is 0x%x\n",
                        ep->ep.name, ep_maxpacket(ep), ep_index(ep));

        if (list_empty(&ep->queue)) {
                seq_puts(m, "its req queue is empty\n\n");
        } else {
                list_for_each_entry(req, &ep->queue, queue) {
                        seq_printf(m,
                                "req %p actual 0x%x length 0x%x buf %p\n",
                                &req->req, req->req.actual,
                                req->req.length, req->req.buf);
                }
        }
        /* other gadget->eplist ep */
        list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
                if (ep->ep.desc) {
                        seq_printf(m,
                                        "\nFor %s Maxpkt is 0x%x "
                                        "index is 0x%x\n",
                                        ep->ep.name, ep_maxpacket(ep),
                                        ep_index(ep));

                        if (list_empty(&ep->queue)) {
                                seq_puts(m, "its req queue is empty\n\n");
                        } else {
                                list_for_each_entry(req, &ep->queue, queue) {
                                        seq_printf(m,
                                                "req %p actual 0x%x length "
                                                "0x%x  buf %p\n",
                                                &req->req, req->req.actual,
                                                req->req.length, req->req.buf);
                                }       /* end for each_entry of ep req */
                        }       /* end for else */
                }       /* end for if(ep->queue) */
        }       /* end (ep->desc) */

        spin_unlock_irqrestore(&udc->lock, flags);
        return 0;
}

#define create_proc_file() \
        proc_create_single(proc_filename, 0, NULL, fsl_proc_read)
#define remove_proc_file()      remove_proc_entry(proc_filename, NULL)

#else                           /* !CONFIG_USB_GADGET_DEBUG_FILES */

#define create_proc_file()      do {} while (0)
#define remove_proc_file()      do {} while (0)

#endif                          /* CONFIG_USB_GADGET_DEBUG_FILES */

/*-------------------------------------------------------------------------*/

/* Release udc structures */
static void fsl_udc_release(struct device *dev)
{
        complete(udc_controller->done);
        dma_free_coherent(dev->parent, udc_controller->ep_qh_size,
                        udc_controller->ep_qh, udc_controller->ep_qh_dma);
        kfree(udc_controller);
}

/******************************************************************
        Internal structure setup functions
*******************************************************************/
/*------------------------------------------------------------------
 * init resource for global controller called by fsl_udc_probe()
 * On success the udc handle is initialized, on failure it is
 * unchanged (reset).
 * Return 0 on success and -1 on allocation failure
 ------------------------------------------------------------------*/
static int struct_udc_setup(struct fsl_udc *udc,
                struct platform_device *pdev)
{
        struct fsl_usb2_platform_data *pdata;
        size_t size;

        pdata = dev_get_platdata(&pdev->dev);
        udc->phy_mode = pdata->phy_mode;

        udc->eps = kzalloc_objs(struct fsl_ep, udc->max_ep);
        if (!udc->eps) {
                dev_err(&udc->gadget.dev, "kmalloc udc endpoint status failed\n");
                goto eps_alloc_failed;
        }

        /* initialized QHs, take care of alignment */
        size = udc->max_ep * sizeof(struct ep_queue_head);
        if (size < QH_ALIGNMENT)
                size = QH_ALIGNMENT;
        else if ((size % QH_ALIGNMENT) != 0) {
                size += QH_ALIGNMENT + 1;
                size &= ~(QH_ALIGNMENT - 1);
        }
        udc->ep_qh = dma_alloc_coherent(&pdev->dev, size,
                                        &udc->ep_qh_dma, GFP_KERNEL);
        if (!udc->ep_qh) {
                dev_err(&udc->gadget.dev, "malloc QHs for udc failed\n");
                goto ep_queue_alloc_failed;
        }

        udc->ep_qh_size = size;

        /* Initialize ep0 status request structure */
        /* FIXME: fsl_alloc_request() ignores ep argument */
        udc->status_req = container_of(fsl_alloc_request(NULL, GFP_KERNEL),
                        struct fsl_req, req);
        if (!udc->status_req) {
                dev_err(&udc->gadget.dev, "kzalloc for udc status request failed\n");
                goto udc_status_alloc_failed;
        }

        /* allocate a small amount of memory to get valid address */
        udc->status_req->req.buf = kmalloc(8, GFP_KERNEL);
        if (!udc->status_req->req.buf) {
                dev_err(&udc->gadget.dev, "kzalloc for udc request buffer failed\n");
                goto udc_req_buf_alloc_failed;
        }

        udc->resume_state = USB_STATE_NOTATTACHED;
        udc->usb_state = USB_STATE_POWERED;
        udc->ep0_dir = 0;
        udc->remote_wakeup = 0; /* default to 0 on reset */

        return 0;

udc_req_buf_alloc_failed:
        kfree(udc->status_req);
udc_status_alloc_failed:
        kfree(udc->ep_qh);
        udc->ep_qh_size = 0;
ep_queue_alloc_failed:
        kfree(udc->eps);
eps_alloc_failed:
        udc->phy_mode = 0;
        return -1;

}

/*----------------------------------------------------------------
 * Setup the fsl_ep struct for eps
 * Link fsl_ep->ep to gadget->ep_list
 * ep0out is not used so do nothing here
 * ep0in should be taken care
 *--------------------------------------------------------------*/
static int struct_ep_setup(struct fsl_udc *udc, unsigned char index,
                char *name, int link)
{
        struct fsl_ep *ep = &udc->eps[index];

        ep->udc = udc;
        strcpy(ep->name, name);
        ep->ep.name = ep->name;

        ep->ep.ops = &fsl_ep_ops;
        ep->stopped = 0;

        if (index == 0) {
                ep->ep.caps.type_control = true;
        } else {
                ep->ep.caps.type_iso = true;
                ep->ep.caps.type_bulk = true;
                ep->ep.caps.type_int = true;
        }

        if (index & 1)
                ep->ep.caps.dir_in = true;
        else
                ep->ep.caps.dir_out = true;

        /* for ep0: maxP defined in desc
         * for other eps, maxP is set by epautoconfig() called by gadget layer
         */
        usb_ep_set_maxpacket_limit(&ep->ep, (unsigned short) ~0);

        /* the queue lists any req for this ep */
        INIT_LIST_HEAD(&ep->queue);

        /* gagdet.ep_list used for ep_autoconfig so no ep0 */
        if (link)
                list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
        ep->gadget = &udc->gadget;
        ep->qh = &udc->ep_qh[index];

        return 0;
}

/* Driver probe function
 * all initialization operations implemented here except enabling usb_intr reg
 * board setup should have been done in the platform code
 */
static int fsl_udc_probe(struct platform_device *pdev)
{
        struct fsl_usb2_platform_data *pdata;
        struct resource *res;
        int ret = -ENODEV;
        unsigned int i;
        u32 dccparams;

        udc_controller = kzalloc_obj(struct fsl_udc);
        if (udc_controller == NULL)
                return -ENOMEM;

        pdata = dev_get_platdata(&pdev->dev);
        udc_controller->pdata = pdata;
        spin_lock_init(&udc_controller->lock);
        udc_controller->stopped = 1;

#ifdef CONFIG_USB_OTG
        if (pdata->operating_mode == FSL_USB2_DR_OTG) {
                udc_controller->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
                if (IS_ERR_OR_NULL(udc_controller->transceiver)) {
                        dev_err(&udc_controller->gadget.dev, "Can't find OTG driver!\n");
                        ret = -ENODEV;
                        goto err_kfree;
                }
        }
#endif

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!res) {
                ret = -ENXIO;
                goto err_kfree;
        }

        if (pdata->operating_mode == FSL_USB2_DR_DEVICE) {
                if (!request_mem_region(res->start, resource_size(res),
                                        driver_name)) {
                        dev_err(&udc_controller->gadget.dev, "request mem region for %s failed\n", pdev->name);
                        ret = -EBUSY;
                        goto err_kfree;
                }
        }

        dr_regs = ioremap(res->start, resource_size(res));
        if (!dr_regs) {
                ret = -ENOMEM;
                goto err_release_mem_region;
        }

        pdata->regs = (void __iomem *)dr_regs;

        /*
         * do platform specific init: check the clock, grab/config pins, etc.
         */
        if (pdata->init && pdata->init(pdev)) {
                ret = -ENODEV;
                goto err_iounmap;
        }

        /* Set accessors only after pdata->init() ! */
        fsl_set_accessors(pdata);

        if (pdata->have_sysif_regs)
                usb_sys_regs = (void *)dr_regs + USB_DR_SYS_OFFSET;

        /* Read Device Controller Capability Parameters register */
        dccparams = fsl_readl(&dr_regs->dccparams);
        if (!(dccparams & DCCPARAMS_DC)) {
                dev_err(&udc_controller->gadget.dev, "This SOC doesn't support device role\n");
                ret = -ENODEV;
                goto err_exit;
        }
        /* Get max device endpoints */
        /* DEN is bidirectional ep number, max_ep doubles the number */
        udc_controller->max_ep = (dccparams & DCCPARAMS_DEN_MASK) * 2;

        ret = platform_get_irq(pdev, 0);
        if (ret <= 0) {
                ret = ret ? : -ENODEV;
                goto err_exit;
        }
        udc_controller->irq = ret;

        ret = request_irq(udc_controller->irq, fsl_udc_irq, IRQF_SHARED,
                        driver_name, udc_controller);
        if (ret != 0) {
                dev_err(&udc_controller->gadget.dev, "cannot request irq %d err %d\n",
                                udc_controller->irq, ret);
                goto err_exit;
        }

        /* Initialize the udc structure including QH member and other member */
        if (struct_udc_setup(udc_controller, pdev)) {
                dev_err(&udc_controller->gadget.dev, "Can't initialize udc data structure\n");
                ret = -ENOMEM;
                goto err_free_irq;
        }

        if (IS_ERR_OR_NULL(udc_controller->transceiver)) {
                /* initialize usb hw reg except for regs for EP,
                 * leave usbintr reg untouched */
                dr_controller_setup(udc_controller);
        }

        /* Setup gadget structure */
        udc_controller->gadget.ops = &fsl_gadget_ops;
        udc_controller->gadget.max_speed = USB_SPEED_HIGH;
        udc_controller->gadget.ep0 = &udc_controller->eps[0].ep;
        INIT_LIST_HEAD(&udc_controller->gadget.ep_list);
        udc_controller->gadget.speed = USB_SPEED_UNKNOWN;
        udc_controller->gadget.name = driver_name;

        /* Setup gadget.dev and register with kernel */
        dev_set_name(&udc_controller->gadget.dev, "gadget");
        udc_controller->gadget.dev.of_node = pdev->dev.of_node;

        if (!IS_ERR_OR_NULL(udc_controller->transceiver))
                udc_controller->gadget.is_otg = 1;

        /* setup QH and epctrl for ep0 */
        ep0_setup(udc_controller);

        /* setup udc->eps[] for ep0 */
        struct_ep_setup(udc_controller, 0, "ep0", 0);
        /* for ep0: the desc defined here;
         * for other eps, gadget layer called ep_enable with defined desc
         */
        udc_controller->eps[0].ep.desc = &fsl_ep0_desc;
        usb_ep_set_maxpacket_limit(&udc_controller->eps[0].ep,
                                   USB_MAX_CTRL_PAYLOAD);

        /* setup the udc->eps[] for non-control endpoints and link
         * to gadget.ep_list */
        for (i = 1; i < (int)(udc_controller->max_ep / 2); i++) {
                char name[16];

                sprintf(name, "ep%dout", i);
                struct_ep_setup(udc_controller, i * 2, name, 1);
                sprintf(name, "ep%din", i);
                struct_ep_setup(udc_controller, i * 2 + 1, name, 1);
        }

        /* use dma_pool for TD management */
        udc_controller->td_pool = dma_pool_create("udc_td", &pdev->dev,
                        sizeof(struct ep_td_struct),
                        DTD_ALIGNMENT, UDC_DMA_BOUNDARY);
        if (udc_controller->td_pool == NULL) {
                ret = -ENOMEM;
                goto err_free_irq;
        }

        ret = usb_add_gadget_udc_release(&pdev->dev, &udc_controller->gadget,
                        fsl_udc_release);
        if (ret)
                goto err_del_udc;

        create_proc_file();
        return 0;

err_del_udc:
        dma_pool_destroy(udc_controller->td_pool);
err_free_irq:
        free_irq(udc_controller->irq, udc_controller);
err_exit:
        if (pdata->exit)
                pdata->exit(pdev);
err_iounmap:
        iounmap(dr_regs);
err_release_mem_region:
        if (pdata->operating_mode == FSL_USB2_DR_DEVICE)
                release_mem_region(res->start, resource_size(res));
err_kfree:
        kfree(udc_controller);
        udc_controller = NULL;
        return ret;
}

/* Driver removal function
 * Free resources and finish pending transactions
 */
static void fsl_udc_remove(struct platform_device *pdev)
{
        struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev);

        DECLARE_COMPLETION_ONSTACK(done);

        if (!udc_controller) {
                dev_err(&pdev->dev,
                        "Driver still in use but removing anyhow\n");
                return;
        }

        udc_controller->done = &done;
        usb_del_gadget_udc(&udc_controller->gadget);

        /* DR has been stopped in usb_gadget_unregister_driver() */
        remove_proc_file();

        /* Free allocated memory */
        kfree(udc_controller->status_req->req.buf);
        kfree(udc_controller->status_req);
        kfree(udc_controller->eps);

        dma_pool_destroy(udc_controller->td_pool);
        free_irq(udc_controller->irq, udc_controller);
        iounmap(dr_regs);
        if (res && (pdata->operating_mode == FSL_USB2_DR_DEVICE))
                release_mem_region(res->start, resource_size(res));

        /* free udc --wait for the release() finished */
        wait_for_completion(&done);

        /*
         * do platform specific un-initialization:
         * release iomux pins, etc.
         */
        if (pdata->exit)
                pdata->exit(pdev);
}

/*-----------------------------------------------------------------
 * Modify Power management attributes
 * Used by OTG statemachine to disable gadget temporarily
 -----------------------------------------------------------------*/
static int fsl_udc_suspend(struct platform_device *pdev, pm_message_t state)
{
        dr_controller_stop(udc_controller);
        return 0;
}

/*-----------------------------------------------------------------
 * Invoked on USB resume. May be called in_interrupt.
 * Here we start the DR controller and enable the irq
 *-----------------------------------------------------------------*/
static int fsl_udc_resume(struct platform_device *pdev)
{
        /* Enable DR irq reg and set controller Run */
        if (udc_controller->stopped) {
                dr_controller_setup(udc_controller);
                dr_controller_run(udc_controller);
        }
        udc_controller->usb_state = USB_STATE_ATTACHED;
        udc_controller->ep0_state = WAIT_FOR_SETUP;
        udc_controller->ep0_dir = 0;
        return 0;
}

static int fsl_udc_otg_suspend(struct device *dev, pm_message_t state)
{
        struct fsl_udc *udc = udc_controller;
        u32 mode, usbcmd;

        mode = fsl_readl(&dr_regs->usbmode) & USB_MODE_CTRL_MODE_MASK;

        pr_debug("%s(): mode 0x%x stopped %d\n", __func__, mode, udc->stopped);

        /*
         * If the controller is already stopped, then this must be a
         * PM suspend.  Remember this fact, so that we will leave the
         * controller stopped at PM resume time.
         */
        if (udc->stopped) {
                pr_debug("gadget already stopped, leaving early\n");
                udc->already_stopped = 1;
                return 0;
        }

        if (mode != USB_MODE_CTRL_MODE_DEVICE) {
                pr_debug("gadget not in device mode, leaving early\n");
                return 0;
        }

        /* stop the controller */
        usbcmd = fsl_readl(&dr_regs->usbcmd) & ~USB_CMD_RUN_STOP;
        fsl_writel(usbcmd, &dr_regs->usbcmd);

        udc->stopped = 1;

        pr_info("USB Gadget suspended\n");

        return 0;
}

static int fsl_udc_otg_resume(struct device *dev)
{
        pr_debug("%s(): stopped %d  already_stopped %d\n", __func__,
                 udc_controller->stopped, udc_controller->already_stopped);

        /*
         * If the controller was stopped at suspend time, then
         * don't resume it now.
         */
        if (udc_controller->already_stopped) {
                udc_controller->already_stopped = 0;
                pr_debug("gadget was already stopped, leaving early\n");
                return 0;
        }

        pr_info("USB Gadget resume\n");

        return fsl_udc_resume(NULL);
}
/*-------------------------------------------------------------------------
        Register entry point for the peripheral controller driver
--------------------------------------------------------------------------*/
static const struct platform_device_id fsl_udc_devtype[] = {
        {
                .name = "fsl-usb2-udc",
        }, {
                /* sentinel */
        }
};
MODULE_DEVICE_TABLE(platform, fsl_udc_devtype);

static const struct of_device_id fsl_udc_dt_ids[] = {
        { .compatible = "fsl-usb2-dr" },
        { .compatible = "fsl-usb2-mph" },
        { .compatible = "fsl,mpc5121-usb2-dr" },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, fsl_udc_dt_ids);

static struct platform_driver udc_driver = {
        .probe          = fsl_udc_probe,
        .remove         = fsl_udc_remove,
        .id_table       = fsl_udc_devtype,
        /* these suspend and resume are not usb suspend and resume */
        .suspend        = fsl_udc_suspend,
        .resume         = fsl_udc_resume,
        .driver         = {
                        .name = driver_name,
                        .of_match_table = fsl_udc_dt_ids,
                        /* udc suspend/resume called from OTG driver */
                        .suspend = fsl_udc_otg_suspend,
                        .resume  = fsl_udc_otg_resume,
        },
};

module_platform_driver(udc_driver);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:fsl-usb2-udc");