ohci-ep93xx.c

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/*
 * OHCI HCD (Host Controller Driver) for USB.
 *
 * (C) Copyright 1999 Roman Weissgaerber <[email protected]>
 * (C) Copyright 2000-2002 David Brownell <[email protected]>
 * (C) Copyright 2002 Hewlett-Packard Company
 *
 * Bus Glue for ep93xx.
 *
 * Written by Christopher Hoover <[email protected]>
 * Based on fragments of previous driver by Russell King et al.
 *
 * Modified for LH7A404 from ohci-sa1111.c
 *  by Durgesh Pattamatta <[email protected]>
 *
 * Modified for pxa27x from ohci-lh7a404.c
 *  by Nick Bane <[email protected]> 26-8-2004
 *
 * Modified for ep93xx from ohci-pxa27x.c
 *  by Lennert Buytenhek <[email protected]> 28-2-2006
 *  Based on an earlier driver by Ray Lehtiniemi
 *
 * This file is licenced under the GPL.
 */

#include <linux/clk.h>
#include <linux/device.h>
#include <linux/signal.h>
#include <linux/platform_device.h>

static struct clk *usb_host_clock;

static void ep93xx_start_hc(struct device *dev)
{
    clk_enable(usb_host_clock);
}

static void ep93xx_stop_hc(struct device *dev)
{
    clk_disable(usb_host_clock);
}

static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
             struct platform_device *pdev)
{
    int retval;
    struct usb_hcd *hcd;

    if (pdev->resource[1].flags != IORESOURCE_IRQ) {
        dev_dbg(&pdev->dev, "resource[1] is not IORESOURCE_IRQ\n");
        return -ENOMEM;
    }

    hcd = usb_create_hcd(driver, &pdev->dev, "ep93xx");
    if (hcd == NULL)
        return -ENOMEM;

    hcd->rsrc_start = pdev->resource[0].start;
    hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
    if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
        usb_put_hcd(hcd);
        retval = -EBUSY;
        goto err1;
    }

    hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
    if (hcd->regs == NULL) {
        dev_dbg(&pdev->dev, "ioremap failed\n");
        retval = -ENOMEM;
        goto err2;
    }

    usb_host_clock = clk_get(&pdev->dev, NULL);
    if (IS_ERR(usb_host_clock)) {
        dev_dbg(&pdev->dev, "clk_get failed\n");
        retval = PTR_ERR(usb_host_clock);
        goto err3;
    }

    ep93xx_start_hc(&pdev->dev);

    ohci_hcd_init(hcd_to_ohci(hcd));

    retval = usb_add_hcd(hcd, pdev->resource[1].start, 0);
    if (retval == 0)
        return retval;

    ep93xx_stop_hc(&pdev->dev);
err3:
    iounmap(hcd->regs);
err2:
    release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err1:
    usb_put_hcd(hcd);

    return retval;
}

static void usb_hcd_ep93xx_remove(struct usb_hcd *hcd,
            struct platform_device *pdev)
{
    usb_remove_hcd(hcd);
    ep93xx_stop_hc(&pdev->dev);
    clk_put(usb_host_clock);
    iounmap(hcd->regs);
    release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
    usb_put_hcd(hcd);
}

static int __devinit ohci_ep93xx_start(struct usb_hcd *hcd)
{
    struct ohci_hcd *ohci = hcd_to_ohci(hcd);
    int ret;

    if ((ret = ohci_init(ohci)) < 0)
        return ret;

    if ((ret = ohci_run(ohci)) < 0) {
        dev_err(hcd->self.controller, "can't start %s\n",
            hcd->self.bus_name);
        ohci_stop(hcd);
        return ret;
    }

    return 0;
}

static struct hc_driver ohci_ep93xx_hc_driver = {
    .description        = hcd_name,
    .product_desc       = "EP93xx OHCI",
    .hcd_priv_size      = sizeof(struct ohci_hcd),
    .irq            = ohci_irq,
    .flags          = HCD_USB11 | HCD_MEMORY,
    .start          = ohci_ep93xx_start,
    .stop           = ohci_stop,
    .shutdown       = ohci_shutdown,
    .urb_enqueue        = ohci_urb_enqueue,
    .urb_dequeue        = ohci_urb_dequeue,
    .endpoint_disable   = ohci_endpoint_disable,
    .get_frame_number   = ohci_get_frame,
    .hub_status_data    = ohci_hub_status_data,
    .hub_control        = ohci_hub_control,
#ifdef CONFIG_PM
    .bus_suspend        = ohci_bus_suspend,
    .bus_resume     = ohci_bus_resume,
#endif
    .start_port_reset   = ohci_start_port_reset,
};

extern int usb_disabled(void);

static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
{
    int ret;

    ret = -ENODEV;
    if (!usb_disabled())
        ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);

    return ret;
}

static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
{
    struct usb_hcd *hcd = platform_get_drvdata(pdev);

    usb_hcd_ep93xx_remove(hcd, pdev);

    return 0;
}

#ifdef CONFIG_PM
static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
{
    struct usb_hcd *hcd = platform_get_drvdata(pdev);
    struct ohci_hcd *ohci = hcd_to_ohci(hcd);

    if (time_before(jiffies, ohci->next_statechange))
        msleep(5);
    ohci->next_statechange = jiffies;

    ep93xx_stop_hc(&pdev->dev);
    return 0;
}

static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
{
    struct usb_hcd *hcd = platform_get_drvdata(pdev);
    struct ohci_hcd *ohci = hcd_to_ohci(hcd);

    if (time_before(jiffies, ohci->next_statechange))
        msleep(5);
    ohci->next_statechange = jiffies;

    ep93xx_start_hc(&pdev->dev);

    ohci_finish_controller_resume(hcd);
    return 0;
}
#endif


static struct platform_driver ohci_hcd_ep93xx_driver = {
    .probe      = ohci_hcd_ep93xx_drv_probe,
    .remove     = ohci_hcd_ep93xx_drv_remove,
    .shutdown   = usb_hcd_platform_shutdown,
#ifdef CONFIG_PM
    .suspend    = ohci_hcd_ep93xx_drv_suspend,
    .resume     = ohci_hcd_ep93xx_drv_resume,
#endif
    .driver     = {
        .name   = "ep93xx-ohci",
        .owner  = THIS_MODULE,
    },
};

MODULE_ALIAS("platform:ep93xx-ohci");