// SPDX-License-Identifier: GPL-2.0+
/*
 * c67x00-hcd.c: Cypress C67X00 USB Host Controller Driver
 *
 * Copyright (C) 2006-2008 Barco N.V.
 *    Derived from the Cypress cy7c67200/300 ezusb linux driver and
 *    based on multiple host controller drivers inside the linux kernel.
 */

#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/usb.h>

#include "c67x00.h"
#include "c67x00-hcd.h"

/* --------------------------------------------------------------------------
 * Root Hub Support
 */

static __u8 c67x00_hub_des[] = {
        0x09,                   /*  __u8  bLength; */
        USB_DT_HUB,             /*  __u8  bDescriptorType; Hub-descriptor */
        0x02,                   /*  __u8  bNbrPorts; */
        0x00,                   /* __u16  wHubCharacteristics; */
        0x00,                   /*   (per-port OC, no power switching) */
        0x32,                   /*  __u8  bPwrOn2pwrGood; 2ms */
        0x00,                   /*  __u8  bHubContrCurrent; 0 mA */
        0x00,                   /*  __u8  DeviceRemovable; ** 7 Ports max ** */
        0xff,                   /*  __u8  PortPwrCtrlMask; ** 7 ports max ** */
};

static void c67x00_hub_reset_host_port(struct c67x00_sie *sie, int port)
{
        struct c67x00_hcd *c67x00 = sie->private_data;
        unsigned long flags;

        c67x00_ll_husb_reset(sie, port);

        spin_lock_irqsave(&c67x00->lock, flags);
        c67x00_ll_husb_reset_port(sie, port);
        spin_unlock_irqrestore(&c67x00->lock, flags);

        c67x00_ll_set_husb_eot(sie->dev, DEFAULT_EOT);
}

static int c67x00_hub_status_data(struct usb_hcd *hcd, char *buf)
{
        struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
        struct c67x00_sie *sie = c67x00->sie;
        u16 status;
        int i;

        *buf = 0;
        status = c67x00_ll_usb_get_status(sie);
        for (i = 0; i < C67X00_PORTS; i++)
                if (status & PORT_CONNECT_CHANGE(i))
                        *buf |= (1 << i);

        /* bit 0 denotes hub change, b1..n port change */
        *buf <<= 1;

        return !!*buf;
}

static int c67x00_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                              u16 wIndex, char *buf, u16 wLength)
{
        struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
        struct c67x00_sie *sie = c67x00->sie;
        u16 status, usb_status;
        int len = 0;
        unsigned int port = wIndex-1;
        u16 wPortChange, wPortStatus;

        switch (typeReq) {

        case GetHubStatus:
                *(__le32 *) buf = cpu_to_le32(0);
                len = 4;                /* hub power */
                break;

        case GetPortStatus:
                if (wIndex > C67X00_PORTS)
                        return -EPIPE;

                status = c67x00_ll_usb_get_status(sie);
                usb_status = c67x00_ll_get_usb_ctl(sie);

                wPortChange = 0;
                if (status & PORT_CONNECT_CHANGE(port))
                        wPortChange |= USB_PORT_STAT_C_CONNECTION;

                wPortStatus = USB_PORT_STAT_POWER;
                if (!(status & PORT_SE0_STATUS(port)))
                        wPortStatus |= USB_PORT_STAT_CONNECTION;
                if (usb_status & LOW_SPEED_PORT(port)) {
                        wPortStatus |= USB_PORT_STAT_LOW_SPEED;
                        c67x00->low_speed_ports |= (1 << port);
                } else
                        c67x00->low_speed_ports &= ~(1 << port);

                if (usb_status & SOF_EOP_EN(port))
                        wPortStatus |= USB_PORT_STAT_ENABLE;

                *(__le16 *) buf = cpu_to_le16(wPortStatus);
                *(__le16 *) (buf + 2) = cpu_to_le16(wPortChange);
                len = 4;
                break;

        case SetHubFeature:     /* We don't implement these */
        case ClearHubFeature:
                switch (wValue) {
                case C_HUB_OVER_CURRENT:
                case C_HUB_LOCAL_POWER:
                        len = 0;
                        break;

                default:
                        return -EPIPE;
                }
                break;

        case SetPortFeature:
                if (wIndex > C67X00_PORTS)
                        return -EPIPE;

                switch (wValue) {
                case USB_PORT_FEAT_SUSPEND:
                        dev_dbg(c67x00_hcd_dev(c67x00),
                                "SetPortFeature %d (SUSPEND)\n", port);
                        len = 0;
                        break;

                case USB_PORT_FEAT_RESET:
                        c67x00_hub_reset_host_port(sie, port);
                        len = 0;
                        break;

                case USB_PORT_FEAT_POWER:
                        /* Power always enabled */
                        len = 0;
                        break;

                default:
                        dev_dbg(c67x00_hcd_dev(c67x00),
                                "%s: SetPortFeature %d (0x%04x) Error!\n",
                                __func__, port, wValue);
                        return -EPIPE;
                }
                break;

        case ClearPortFeature:
                if (wIndex > C67X00_PORTS)
                        return -EPIPE;

                switch (wValue) {
                case USB_PORT_FEAT_ENABLE:
                        /* Reset the port so that the c67x00 also notices the
                         * disconnect */
                        c67x00_hub_reset_host_port(sie, port);
                        len = 0;
                        break;

                case USB_PORT_FEAT_C_ENABLE:
                        dev_dbg(c67x00_hcd_dev(c67x00),
                                "ClearPortFeature (%d): C_ENABLE\n", port);
                        len = 0;
                        break;

                case USB_PORT_FEAT_SUSPEND:
                        dev_dbg(c67x00_hcd_dev(c67x00),
                                "ClearPortFeature (%d): SUSPEND\n", port);
                        len = 0;
                        break;

                case USB_PORT_FEAT_C_SUSPEND:
                        dev_dbg(c67x00_hcd_dev(c67x00),
                                "ClearPortFeature (%d): C_SUSPEND\n", port);
                        len = 0;
                        break;

                case USB_PORT_FEAT_POWER:
                        dev_dbg(c67x00_hcd_dev(c67x00),
                                "ClearPortFeature (%d): POWER\n", port);
                        return -EPIPE;

                case USB_PORT_FEAT_C_CONNECTION:
                        c67x00_ll_usb_clear_status(sie,
                                                   PORT_CONNECT_CHANGE(port));
                        len = 0;
                        break;

                case USB_PORT_FEAT_C_OVER_CURRENT:
                        dev_dbg(c67x00_hcd_dev(c67x00),
                                "ClearPortFeature (%d): OVER_CURRENT\n", port);
                        len = 0;
                        break;

                case USB_PORT_FEAT_C_RESET:
                        dev_dbg(c67x00_hcd_dev(c67x00),
                                "ClearPortFeature (%d): C_RESET\n", port);
                        len = 0;
                        break;

                default:
                        dev_dbg(c67x00_hcd_dev(c67x00),
                                "%s: ClearPortFeature %d (0x%04x) Error!\n",
                                __func__, port, wValue);
                        return -EPIPE;
                }
                break;

        case GetHubDescriptor:
                len = min_t(unsigned int, sizeof(c67x00_hub_des), wLength);
                memcpy(buf, c67x00_hub_des, len);
                break;

        default:
                dev_dbg(c67x00_hcd_dev(c67x00), "%s: unknown\n", __func__);
                return -EPIPE;
        }

        return 0;
}

/* ---------------------------------------------------------------------
 * Main part of host controller driver
 */

/*
 * c67x00_hcd_irq
 *
 * This function is called from the interrupt handler in c67x00-drv.c
 */
static void c67x00_hcd_irq(struct c67x00_sie *sie, u16 int_status, u16 msg)
{
        struct c67x00_hcd *c67x00 = sie->private_data;
        struct usb_hcd *hcd = c67x00_hcd_to_hcd(c67x00);

        /* Handle sie message flags */
        if (msg) {
                if (msg & HUSB_TDListDone)
                        c67x00_sched_kick(c67x00);
                else
                        dev_warn(c67x00_hcd_dev(c67x00),
                                 "Unknown SIE msg flag(s): 0x%04x\n", msg);
        }

        if (unlikely(hcd->state == HC_STATE_HALT))
                return;

        if (!HCD_HW_ACCESSIBLE(hcd))
                return;

        /* Handle Start of frame events */
        if (int_status & SOFEOP_FLG(sie->sie_num)) {
                c67x00_ll_usb_clear_status(sie, SOF_EOP_IRQ_FLG);
                c67x00_sched_kick(c67x00);
        }
}

/*
 * c67x00_hcd_start: Host controller start hook
 */
static int c67x00_hcd_start(struct usb_hcd *hcd)
{
        hcd->uses_new_polling = 1;
        hcd->state = HC_STATE_RUNNING;
        set_bit(HCD_FLAG_POLL_RH, &hcd->flags);

        return 0;
}

/*
 * c67x00_hcd_stop: Host controller stop hook
 */
static void c67x00_hcd_stop(struct usb_hcd *hcd)
{
        /* Nothing to do */
}

static int c67x00_hcd_get_frame(struct usb_hcd *hcd)
{
        struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
        u16 temp_val;

        dev_dbg(c67x00_hcd_dev(c67x00), "%s\n", __func__);
        temp_val = c67x00_ll_husb_get_frame(c67x00->sie);
        temp_val &= HOST_FRAME_MASK;
        return temp_val ? (temp_val - 1) : HOST_FRAME_MASK;
}

static const struct hc_driver c67x00_hc_driver = {
        .description    = "c67x00-hcd",
        .product_desc   = "Cypress C67X00 Host Controller",
        .hcd_priv_size  = sizeof(struct c67x00_hcd),
        .flags          = HCD_USB11 | HCD_MEMORY,

        /*
         * basic lifecycle operations
         */
        .start          = c67x00_hcd_start,
        .stop           = c67x00_hcd_stop,

        /*
         * managing i/o requests and associated device resources
         */
        .urb_enqueue    = c67x00_urb_enqueue,
        .urb_dequeue    = c67x00_urb_dequeue,
        .endpoint_disable = c67x00_endpoint_disable,

        /*
         * scheduling support
         */
        .get_frame_number = c67x00_hcd_get_frame,

        /*
         * root hub support
         */
        .hub_status_data = c67x00_hub_status_data,
        .hub_control    = c67x00_hub_control,
};

/* ---------------------------------------------------------------------
 * Setup/Teardown routines
 */

int c67x00_hcd_probe(struct c67x00_sie *sie)
{
        struct c67x00_hcd *c67x00;
        struct usb_hcd *hcd;
        unsigned long flags;
        int retval;

        if (usb_disabled())
                return -ENODEV;

        hcd = usb_create_hcd(&c67x00_hc_driver, sie_dev(sie), "c67x00_sie");
        if (!hcd) {
                retval = -ENOMEM;
                goto err0;
        }
        c67x00 = hcd_to_c67x00_hcd(hcd);

        spin_lock_init(&c67x00->lock);
        c67x00->sie = sie;

        INIT_LIST_HEAD(&c67x00->list[PIPE_ISOCHRONOUS]);
        INIT_LIST_HEAD(&c67x00->list[PIPE_INTERRUPT]);
        INIT_LIST_HEAD(&c67x00->list[PIPE_CONTROL]);
        INIT_LIST_HEAD(&c67x00->list[PIPE_BULK]);
        c67x00->urb_count = 0;
        INIT_LIST_HEAD(&c67x00->td_list);
        c67x00->td_base_addr = CY_HCD_BUF_ADDR + SIE_TD_OFFSET(sie->sie_num);
        c67x00->buf_base_addr = CY_HCD_BUF_ADDR + SIE_BUF_OFFSET(sie->sie_num);
        c67x00->max_frame_bw = MAX_FRAME_BW_STD;

        c67x00_ll_husb_init_host_port(sie);

        init_completion(&c67x00->endpoint_disable);
        retval = c67x00_sched_start_scheduler(c67x00);
        if (retval)
                goto err1;

        retval = usb_add_hcd(hcd, 0, 0);
        if (retval) {
                dev_dbg(sie_dev(sie), "%s: usb_add_hcd returned %d\n",
                        __func__, retval);
                goto err2;
        }

        device_wakeup_enable(hcd->self.controller);

        spin_lock_irqsave(&sie->lock, flags);
        sie->private_data = c67x00;
        sie->irq = c67x00_hcd_irq;
        spin_unlock_irqrestore(&sie->lock, flags);

        return retval;

 err2:
        c67x00_sched_stop_scheduler(c67x00);
 err1:
        usb_put_hcd(hcd);
 err0:
        return retval;
}

/* may be called with controller, bus, and devices active */
void c67x00_hcd_remove(struct c67x00_sie *sie)
{
        struct c67x00_hcd *c67x00 = sie->private_data;
        struct usb_hcd *hcd = c67x00_hcd_to_hcd(c67x00);

        c67x00_sched_stop_scheduler(c67x00);
        usb_remove_hcd(hcd);
        usb_put_hcd(hcd);
}