fhci-hcd.c

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/*
 * Freescale QUICC Engine USB Host Controller Driver
 *
 * Copyright (c) Freescale Semicondutor, Inc. 2006.
 *               Shlomi Gridish <[email protected]>
 *               Jerry Huang <[email protected]>
 * Copyright (c) Logic Product Development, Inc. 2007
 *               Peter Barada <[email protected]>
 * Copyright (c) MontaVista Software, Inc. 2008.
 *               Anton Vorontsov <[email protected]>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/slab.h>
#include <asm/qe.h>
#include <asm/fsl_gtm.h>
#include "fhci.h"

void fhci_start_sof_timer(struct fhci_hcd *fhci)
{
    fhci_dbg(fhci, "-> %s\n", __func__);

    /* clear frame_n */
    out_be16(&fhci->pram->frame_num, 0);

    out_be16(&fhci->regs->usb_ussft, 0);
    setbits8(&fhci->regs->usb_usmod, USB_MODE_SFTE);

    fhci_dbg(fhci, "<- %s\n", __func__);
}

void fhci_stop_sof_timer(struct fhci_hcd *fhci)
{
    fhci_dbg(fhci, "-> %s\n", __func__);

    clrbits8(&fhci->regs->usb_usmod, USB_MODE_SFTE);
    gtm_stop_timer16(fhci->timer);

    fhci_dbg(fhci, "<- %s\n", __func__);
}

u16 fhci_get_sof_timer_count(struct fhci_usb *usb)
{
    return be16_to_cpu(in_be16(&usb->fhci->regs->usb_ussft) / 12);
}

/* initialize the endpoint zero */
static u32 endpoint_zero_init(struct fhci_usb *usb,
                  enum fhci_mem_alloc data_mem,
                  u32 ring_len)
{
    u32 rc;

    rc = fhci_create_ep(usb, data_mem, ring_len);
    if (rc)
        return rc;

    /* inilialize endpoint registers */
    fhci_init_ep_registers(usb, usb->ep0, data_mem);

    return 0;
}

/* enable the USB interrupts */
void fhci_usb_enable_interrupt(struct fhci_usb *usb)
{
    struct fhci_hcd *fhci = usb->fhci;

    if (usb->intr_nesting_cnt == 1) {
        /* initialize the USB interrupt */
        enable_irq(fhci_to_hcd(fhci)->irq);

        /* initialize the event register and mask register */
        out_be16(&usb->fhci->regs->usb_usber, 0xffff);
        out_be16(&usb->fhci->regs->usb_usbmr, usb->saved_msk);

        /* enable the timer interrupts */
        enable_irq(fhci->timer->irq);
    } else if (usb->intr_nesting_cnt > 1)
        fhci_info(fhci, "unbalanced USB interrupts nesting\n");
    usb->intr_nesting_cnt--;
}

/* disable the usb interrupt */
void fhci_usb_disable_interrupt(struct fhci_usb *usb)
{
    struct fhci_hcd *fhci = usb->fhci;

    if (usb->intr_nesting_cnt == 0) {
        /* disable the timer interrupt */
        disable_irq_nosync(fhci->timer->irq);

        /* disable the usb interrupt */
        disable_irq_nosync(fhci_to_hcd(fhci)->irq);
        out_be16(&usb->fhci->regs->usb_usbmr, 0);
    }
    usb->intr_nesting_cnt++;
}

/* enable the USB controller */
static u32 fhci_usb_enable(struct fhci_hcd *fhci)
{
    struct fhci_usb *usb = fhci->usb_lld;

    out_be16(&usb->fhci->regs->usb_usber, 0xffff);
    out_be16(&usb->fhci->regs->usb_usbmr, usb->saved_msk);
    setbits8(&usb->fhci->regs->usb_usmod, USB_MODE_EN);

    mdelay(100);

    return 0;
}

/* disable the USB controller */
static u32 fhci_usb_disable(struct fhci_hcd *fhci)
{
    struct fhci_usb *usb = fhci->usb_lld;

    fhci_usb_disable_interrupt(usb);
    fhci_port_disable(fhci);

    /* disable the usb controller */
    if (usb->port_status == FHCI_PORT_FULL ||
            usb->port_status == FHCI_PORT_LOW)
        fhci_device_disconnected_interrupt(fhci);

    clrbits8(&usb->fhci->regs->usb_usmod, USB_MODE_EN);

    return 0;
}

/* check the bus state by polling the QE bit on the IO ports */
int fhci_ioports_check_bus_state(struct fhci_hcd *fhci)
{
    u8 bits = 0;

    /* check USBOE,if transmitting,exit */
    if (!gpio_get_value(fhci->gpios[GPIO_USBOE]))
        return -1;

    /* check USBRP */
    if (gpio_get_value(fhci->gpios[GPIO_USBRP]))
        bits |= 0x2;

    /* check USBRN */
    if (gpio_get_value(fhci->gpios[GPIO_USBRN]))
        bits |= 0x1;

    return bits;
}

static void fhci_mem_free(struct fhci_hcd *fhci)
{
    struct ed *ed;
    struct ed *next_ed;
    struct td *td;
    struct td *next_td;

    list_for_each_entry_safe(ed, next_ed, &fhci->empty_eds, node) {
        list_del(&ed->node);
        kfree(ed);
    }

    list_for_each_entry_safe(td, next_td, &fhci->empty_tds, node) {
        list_del(&td->node);
        kfree(td);
    }

    kfree(fhci->vroot_hub);
    fhci->vroot_hub = NULL;

    kfree(fhci->hc_list);
    fhci->hc_list = NULL;
}

static int fhci_mem_init(struct fhci_hcd *fhci)
{
    int i;

    fhci->hc_list = kzalloc(sizeof(*fhci->hc_list), GFP_KERNEL);
    if (!fhci->hc_list)
        goto err;

    INIT_LIST_HEAD(&fhci->hc_list->ctrl_list);
    INIT_LIST_HEAD(&fhci->hc_list->bulk_list);
    INIT_LIST_HEAD(&fhci->hc_list->iso_list);
    INIT_LIST_HEAD(&fhci->hc_list->intr_list);
    INIT_LIST_HEAD(&fhci->hc_list->done_list);

    fhci->vroot_hub = kzalloc(sizeof(*fhci->vroot_hub), GFP_KERNEL);
    if (!fhci->vroot_hub)
        goto err;

    INIT_LIST_HEAD(&fhci->empty_eds);
    INIT_LIST_HEAD(&fhci->empty_tds);

    /* initialize work queue to handle done list */
    fhci_tasklet.data = (unsigned long)fhci;
    fhci->process_done_task = &fhci_tasklet;

    for (i = 0; i < MAX_TDS; i++) {
        struct td *td;

        td = kmalloc(sizeof(*td), GFP_KERNEL);
        if (!td)
            goto err;
        fhci_recycle_empty_td(fhci, td);
    }
    for (i = 0; i < MAX_EDS; i++) {
        struct ed *ed;

        ed = kmalloc(sizeof(*ed), GFP_KERNEL);
        if (!ed)
            goto err;
        fhci_recycle_empty_ed(fhci, ed);
    }

    fhci->active_urbs = 0;
    return 0;
err:
    fhci_mem_free(fhci);
    return -ENOMEM;
}

/* destroy the fhci_usb structure */
static void fhci_usb_free(void *lld)
{
    struct fhci_usb *usb = lld;
    struct fhci_hcd *fhci;

    if (usb) {
        fhci = usb->fhci;
        fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
        fhci_ep0_free(usb);
        kfree(usb->actual_frame);
        kfree(usb);
    }
}

/* initialize the USB */
static int fhci_usb_init(struct fhci_hcd *fhci)
{
    struct fhci_usb *usb = fhci->usb_lld;

    memset_io(usb->fhci->pram, 0, FHCI_PRAM_SIZE);

    usb->port_status = FHCI_PORT_DISABLED;
    usb->max_frame_usage = FRAME_TIME_USAGE;
    usb->sw_transaction_time = SW_FIX_TIME_BETWEEN_TRANSACTION;

    usb->actual_frame = kzalloc(sizeof(*usb->actual_frame), GFP_KERNEL);
    if (!usb->actual_frame) {
        fhci_usb_free(usb);
        return -ENOMEM;
    }

    INIT_LIST_HEAD(&usb->actual_frame->tds_list);

    /* initializing registers on chip, clear frame number */
    out_be16(&fhci->pram->frame_num, 0);

    /* clear rx state */
    out_be32(&fhci->pram->rx_state, 0);

    /* set mask register */
    usb->saved_msk = (USB_E_TXB_MASK |
              USB_E_TXE1_MASK |
              USB_E_IDLE_MASK |
              USB_E_RESET_MASK | USB_E_SFT_MASK | USB_E_MSF_MASK);

    out_8(&usb->fhci->regs->usb_usmod, USB_MODE_HOST | USB_MODE_EN);

    /* clearing the mask register */
    out_be16(&usb->fhci->regs->usb_usbmr, 0);

    /* initialing the event register */
    out_be16(&usb->fhci->regs->usb_usber, 0xffff);

    if (endpoint_zero_init(usb, DEFAULT_DATA_MEM, DEFAULT_RING_LEN) != 0) {
        fhci_usb_free(usb);
        return -EINVAL;
    }

    return 0;
}

/* initialize the fhci_usb struct and the corresponding data staruct */
static struct fhci_usb *fhci_create_lld(struct fhci_hcd *fhci)
{
    struct fhci_usb *usb;

    /* allocate memory for SCC data structure */
    usb = kzalloc(sizeof(*usb), GFP_KERNEL);
    if (!usb) {
        fhci_err(fhci, "no memory for SCC data struct\n");
        return NULL;
    }

    usb->fhci = fhci;
    usb->hc_list = fhci->hc_list;
    usb->vroot_hub = fhci->vroot_hub;

    usb->transfer_confirm = fhci_transfer_confirm_callback;

    return usb;
}

static int fhci_start(struct usb_hcd *hcd)
{
    int ret;
    struct fhci_hcd *fhci = hcd_to_fhci(hcd);

    ret = fhci_mem_init(fhci);
    if (ret) {
        fhci_err(fhci, "failed to allocate memory\n");
        goto err;
    }

    fhci->usb_lld = fhci_create_lld(fhci);
    if (!fhci->usb_lld) {
        fhci_err(fhci, "low level driver config failed\n");
        ret = -ENOMEM;
        goto err;
    }

    ret = fhci_usb_init(fhci);
    if (ret) {
        fhci_err(fhci, "low level driver initialize failed\n");
        goto err;
    }

    spin_lock_init(&fhci->lock);

    /* connect the virtual root hub */
    fhci->vroot_hub->dev_num = 1;   /* this field may be needed to fix */
    fhci->vroot_hub->hub.wHubStatus = 0;
    fhci->vroot_hub->hub.wHubChange = 0;
    fhci->vroot_hub->port.wPortStatus = 0;
    fhci->vroot_hub->port.wPortChange = 0;

    hcd->state = HC_STATE_RUNNING;

    /*
     * From here on, khubd concurrently accesses the root
     * hub; drivers will be talking to enumerated devices.
     * (On restart paths, khubd already knows about the root
     * hub and could find work as soon as we wrote FLAG_CF.)
     *
     * Before this point the HC was idle/ready.  After, khubd
     * and device drivers may start it running.
     */
    fhci_usb_enable(fhci);
    return 0;
err:
    fhci_mem_free(fhci);
    return ret;
}

static void fhci_stop(struct usb_hcd *hcd)
{
    struct fhci_hcd *fhci = hcd_to_fhci(hcd);

    fhci_usb_disable_interrupt(fhci->usb_lld);
    fhci_usb_disable(fhci);

    fhci_usb_free(fhci->usb_lld);
    fhci->usb_lld = NULL;
    fhci_mem_free(fhci);
}

static int fhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
                gfp_t mem_flags)
{
    struct fhci_hcd *fhci = hcd_to_fhci(hcd);
    u32 pipe = urb->pipe;
    int ret;
    int i;
    int size = 0;
    struct urb_priv *urb_priv;
    unsigned long flags;

    switch (usb_pipetype(pipe)) {
    case PIPE_CONTROL:
        /* 1 td fro setup,1 for ack */
        size = 2;
    case PIPE_BULK:
        /* one td for every 4096 bytes(can be up to 8k) */
        size += urb->transfer_buffer_length / 4096;
        /* ...add for any remaining bytes... */
        if ((urb->transfer_buffer_length % 4096) != 0)
            size++;
        /* ..and maybe a zero length packet to wrap it up */
        if (size == 0)
            size++;
        else if ((urb->transfer_flags & URB_ZERO_PACKET) != 0
             && (urb->transfer_buffer_length
                 % usb_maxpacket(urb->dev, pipe,
                         usb_pipeout(pipe))) != 0)
            size++;
        break;
    case PIPE_ISOCHRONOUS:
        size = urb->number_of_packets;
        if (size <= 0)
            return -EINVAL;
        for (i = 0; i < urb->number_of_packets; i++) {
            urb->iso_frame_desc[i].actual_length = 0;
            urb->iso_frame_desc[i].status = (u32) (-EXDEV);
        }
        break;
    case PIPE_INTERRUPT:
        size = 1;
    }

    /* allocate the private part of the URB */
    urb_priv = kzalloc(sizeof(*urb_priv), mem_flags);
    if (!urb_priv)
        return -ENOMEM;

    /* allocate the private part of the URB */
    urb_priv->tds = kcalloc(size, sizeof(*urb_priv->tds), mem_flags);
    if (!urb_priv->tds) {
        kfree(urb_priv);
        return -ENOMEM;
    }

    spin_lock_irqsave(&fhci->lock, flags);

    ret = usb_hcd_link_urb_to_ep(hcd, urb);
    if (ret)
        goto err;

    /* fill the private part of the URB */
    urb_priv->num_of_tds = size;

    urb->status = -EINPROGRESS;
    urb->actual_length = 0;
    urb->error_count = 0;
    urb->hcpriv = urb_priv;

    fhci_queue_urb(fhci, urb);
err:
    if (ret) {
        kfree(urb_priv->tds);
        kfree(urb_priv);
    }
    spin_unlock_irqrestore(&fhci->lock, flags);
    return ret;
}

/* dequeue FHCI URB */
static int fhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
{
    struct fhci_hcd *fhci = hcd_to_fhci(hcd);
    struct fhci_usb *usb = fhci->usb_lld;
    int ret = -EINVAL;
    unsigned long flags;

    if (!urb || !urb->dev || !urb->dev->bus)
        goto out;

    spin_lock_irqsave(&fhci->lock, flags);

    ret = usb_hcd_check_unlink_urb(hcd, urb, status);
    if (ret)
        goto out2;

    if (usb->port_status != FHCI_PORT_DISABLED) {
        struct urb_priv *urb_priv;

        /*
         * flag the urb's data for deletion in some upcoming
         * SF interrupt's delete list processing
         */
        urb_priv = urb->hcpriv;

        if (!urb_priv || (urb_priv->state == URB_DEL))
            goto out2;

        urb_priv->state = URB_DEL;

        /* already pending? */
        urb_priv->ed->state = FHCI_ED_URB_DEL;
    } else {
        fhci_urb_complete_free(fhci, urb);
    }

out2:
    spin_unlock_irqrestore(&fhci->lock, flags);
out:
    return ret;
}

static void fhci_endpoint_disable(struct usb_hcd *hcd,
                  struct usb_host_endpoint *ep)
{
    struct fhci_hcd *fhci;
    struct ed *ed;
    unsigned long flags;

    fhci = hcd_to_fhci(hcd);
    spin_lock_irqsave(&fhci->lock, flags);
    ed = ep->hcpriv;
    if (ed) {
        while (ed->td_head != NULL) {
            struct td *td = fhci_remove_td_from_ed(ed);
            fhci_urb_complete_free(fhci, td->urb);
        }
        fhci_recycle_empty_ed(fhci, ed);
        ep->hcpriv = NULL;
    }
    spin_unlock_irqrestore(&fhci->lock, flags);
}

static int fhci_get_frame_number(struct usb_hcd *hcd)
{
    struct fhci_hcd *fhci = hcd_to_fhci(hcd);

    return get_frame_num(fhci);
}

static const struct hc_driver fhci_driver = {
    .description = "fsl,usb-fhci",
    .product_desc = "FHCI HOST Controller",
    .hcd_priv_size = sizeof(struct fhci_hcd),

    /* generic hardware linkage */
    .irq = fhci_irq,
    .flags = HCD_USB11 | HCD_MEMORY,

    /* basic lifecycle operation */
    .start = fhci_start,
    .stop = fhci_stop,

    /* managing i/o requests and associated device resources */
    .urb_enqueue = fhci_urb_enqueue,
    .urb_dequeue = fhci_urb_dequeue,
    .endpoint_disable = fhci_endpoint_disable,

    /* scheduling support */
    .get_frame_number = fhci_get_frame_number,

    /* root hub support */
    .hub_status_data = fhci_hub_status_data,
    .hub_control = fhci_hub_control,
};

static int __devinit of_fhci_probe(struct platform_device *ofdev)
{
    struct device *dev = &ofdev->dev;
    struct device_node *node = dev->of_node;
    struct usb_hcd *hcd;
    struct fhci_hcd *fhci;
    struct resource usb_regs;
    unsigned long pram_addr;
    unsigned int usb_irq;
    const char *sprop;
    const u32 *iprop;
    int size;
    int ret;
    int i;
    int j;

    if (usb_disabled())
        return -ENODEV;

    sprop = of_get_property(node, "mode", NULL);
    if (sprop && strcmp(sprop, "host"))
        return -ENODEV;

    hcd = usb_create_hcd(&fhci_driver, dev, dev_name(dev));
    if (!hcd) {
        dev_err(dev, "could not create hcd\n");
        return -ENOMEM;
    }

    fhci = hcd_to_fhci(hcd);
    hcd->self.controller = dev;
    dev_set_drvdata(dev, hcd);

    iprop = of_get_property(node, "hub-power-budget", &size);
    if (iprop && size == sizeof(*iprop))
        hcd->power_budget = *iprop;

    /* FHCI registers. */
    ret = of_address_to_resource(node, 0, &usb_regs);
    if (ret) {
        dev_err(dev, "could not get regs\n");
        goto err_regs;
    }

    hcd->regs = ioremap(usb_regs.start, resource_size(&usb_regs));
    if (!hcd->regs) {
        dev_err(dev, "could not ioremap regs\n");
        ret = -ENOMEM;
        goto err_regs;
    }
    fhci->regs = hcd->regs;

    /* Parameter RAM. */
    iprop = of_get_property(node, "reg", &size);
    if (!iprop || size < sizeof(*iprop) * 4) {
        dev_err(dev, "can't get pram offset\n");
        ret = -EINVAL;
        goto err_pram;
    }

    pram_addr = cpm_muram_alloc(FHCI_PRAM_SIZE, 64);
    if (IS_ERR_VALUE(pram_addr)) {
        dev_err(dev, "failed to allocate usb pram\n");
        ret = -ENOMEM;
        goto err_pram;
    }

    qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, QE_CR_SUBBLOCK_USB,
             QE_CR_PROTOCOL_UNSPECIFIED, pram_addr);
    fhci->pram = cpm_muram_addr(pram_addr);

    /* GPIOs and pins */
    for (i = 0; i < NUM_GPIOS; i++) {
        int gpio;
        enum of_gpio_flags flags;

        gpio = of_get_gpio_flags(node, i, &flags);
        fhci->gpios[i] = gpio;
        fhci->alow_gpios[i] = flags & OF_GPIO_ACTIVE_LOW;

        if (!gpio_is_valid(gpio)) {
            if (i < GPIO_SPEED) {
                dev_err(dev, "incorrect GPIO%d: %d\n",
                    i, gpio);
                goto err_gpios;
            } else {
                dev_info(dev, "assuming board doesn't have "
                    "%s gpio\n", i == GPIO_SPEED ?
                    "speed" : "power");
                continue;
            }
        }

        ret = gpio_request(gpio, dev_name(dev));
        if (ret) {
            dev_err(dev, "failed to request gpio %d", i);
            goto err_gpios;
        }

        if (i >= GPIO_SPEED) {
            ret = gpio_direction_output(gpio, 0);
            if (ret) {
                dev_err(dev, "failed to set gpio %d as "
                    "an output\n", i);
                i++;
                goto err_gpios;
            }
        }
    }

    for (j = 0; j < NUM_PINS; j++) {
        fhci->pins[j] = qe_pin_request(node, j);
        if (IS_ERR(fhci->pins[j])) {
            ret = PTR_ERR(fhci->pins[j]);
            dev_err(dev, "can't get pin %d: %d\n", j, ret);
            goto err_pins;
        }
    }

    /* Frame limit timer and its interrupt. */
    fhci->timer = gtm_get_timer16();
    if (IS_ERR(fhci->timer)) {
        ret = PTR_ERR(fhci->timer);
        dev_err(dev, "failed to request qe timer: %i", ret);
        goto err_get_timer;
    }

    ret = request_irq(fhci->timer->irq, fhci_frame_limit_timer_irq,
              0, "qe timer (usb)", hcd);
    if (ret) {
        dev_err(dev, "failed to request timer irq");
        goto err_timer_irq;
    }

    /* USB Host interrupt. */
    usb_irq = irq_of_parse_and_map(node, 0);
    if (usb_irq == NO_IRQ) {
        dev_err(dev, "could not get usb irq\n");
        ret = -EINVAL;
        goto err_usb_irq;
    }

    /* Clocks. */
    sprop = of_get_property(node, "fsl,fullspeed-clock", NULL);
    if (sprop) {
        fhci->fullspeed_clk = qe_clock_source(sprop);
        if (fhci->fullspeed_clk == QE_CLK_DUMMY) {
            dev_err(dev, "wrong fullspeed-clock\n");
            ret = -EINVAL;
            goto err_clocks;
        }
    }

    sprop = of_get_property(node, "fsl,lowspeed-clock", NULL);
    if (sprop) {
        fhci->lowspeed_clk = qe_clock_source(sprop);
        if (fhci->lowspeed_clk == QE_CLK_DUMMY) {
            dev_err(dev, "wrong lowspeed-clock\n");
            ret = -EINVAL;
            goto err_clocks;
        }
    }

    if (fhci->fullspeed_clk == QE_CLK_NONE &&
            fhci->lowspeed_clk == QE_CLK_NONE) {
        dev_err(dev, "no clocks specified\n");
        ret = -EINVAL;
        goto err_clocks;
    }

    dev_info(dev, "at 0x%p, irq %d\n", hcd->regs, usb_irq);

    fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);

    /* Start with full-speed, if possible. */
    if (fhci->fullspeed_clk != QE_CLK_NONE) {
        fhci_config_transceiver(fhci, FHCI_PORT_FULL);
        qe_usb_clock_set(fhci->fullspeed_clk, USB_CLOCK);
    } else {
        fhci_config_transceiver(fhci, FHCI_PORT_LOW);
        qe_usb_clock_set(fhci->lowspeed_clk, USB_CLOCK >> 3);
    }

    /* Clear and disable any pending interrupts. */
    out_be16(&fhci->regs->usb_usber, 0xffff);
    out_be16(&fhci->regs->usb_usbmr, 0);

    ret = usb_add_hcd(hcd, usb_irq, 0);
    if (ret < 0)
        goto err_add_hcd;

    fhci_dfs_create(fhci);

    return 0;

err_add_hcd:
err_clocks:
    irq_dispose_mapping(usb_irq);
err_usb_irq:
    free_irq(fhci->timer->irq, hcd);
err_timer_irq:
    gtm_put_timer16(fhci->timer);
err_get_timer:
err_pins:
    while (--j >= 0)
        qe_pin_free(fhci->pins[j]);
err_gpios:
    while (--i >= 0) {
        if (gpio_is_valid(fhci->gpios[i]))
            gpio_free(fhci->gpios[i]);
    }
    cpm_muram_free(pram_addr);
err_pram:
    iounmap(hcd->regs);
err_regs:
    usb_put_hcd(hcd);
    return ret;
}

static int __devexit fhci_remove(struct device *dev)
{
    struct usb_hcd *hcd = dev_get_drvdata(dev);
    struct fhci_hcd *fhci = hcd_to_fhci(hcd);
    int i;
    int j;

    usb_remove_hcd(hcd);
    free_irq(fhci->timer->irq, hcd);
    gtm_put_timer16(fhci->timer);
    cpm_muram_free(cpm_muram_offset(fhci->pram));
    for (i = 0; i < NUM_GPIOS; i++) {
        if (!gpio_is_valid(fhci->gpios[i]))
            continue;
        gpio_free(fhci->gpios[i]);
    }
    for (j = 0; j < NUM_PINS; j++)
        qe_pin_free(fhci->pins[j]);
    fhci_dfs_destroy(fhci);
    usb_put_hcd(hcd);
    return 0;
}

static int __devexit of_fhci_remove(struct platform_device *ofdev)
{
    return fhci_remove(&ofdev->dev);
}

static const struct of_device_id of_fhci_match[] = {
    { .compatible = "fsl,mpc8323-qe-usb", },
    {},
};
MODULE_DEVICE_TABLE(of, of_fhci_match);

static struct platform_driver of_fhci_driver = {
    .driver = {
        .name = "fsl,usb-fhci",
        .owner = THIS_MODULE,
        .of_match_table = of_fhci_match,
    },
    .probe      = of_fhci_probe,
    .remove     = __devexit_p(of_fhci_remove),
};

module_platform_driver(of_fhci_driver);

MODULE_DESCRIPTION("USB Freescale Host Controller Interface Driver");
MODULE_AUTHOR("Shlomi Gridish <[email protected]>, "
          "Jerry Huang <[email protected]>, "
          "Anton Vorontsov <[email protected]>");
MODULE_LICENSE("GPL");