ehci-sead3.c

Go to the documentation of this file.

/*
 * MIPS CI13320A EHCI Host Controller driver
 * Based on "ehci-au1xxx.c" by K.Boge <[email protected]>
 *
 * Copyright (C) 2012 MIPS Technologies, Inc.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/platform_device.h>

static int ehci_sead3_setup(struct usb_hcd *hcd)
{
    int ret;
    struct ehci_hcd *ehci = hcd_to_ehci(hcd);

    ehci->caps = hcd->regs + 0x100;

#ifdef __BIG_ENDIAN
    ehci->big_endian_mmio = 1;
    ehci->big_endian_desc = 1;
#endif

    ret = ehci_setup(hcd);
    if (ret)
        return ret;

    ehci->need_io_watchdog = 0;

    /* Set burst length to 16 words. */
    ehci_writel(ehci, 0x1010, &ehci->regs->reserved1[1]);

    return ret;
}

const struct hc_driver ehci_sead3_hc_driver = {
    .description        = hcd_name,
    .product_desc       = "SEAD-3 EHCI",
    .hcd_priv_size      = sizeof(struct ehci_hcd),

    /*
     * generic hardware linkage
     */
    .irq            = ehci_irq,
    .flags          = HCD_MEMORY | HCD_USB2,

    /*
     * basic lifecycle operations
     *
     */
    .reset          = ehci_sead3_setup,
    .start          = ehci_run,
    .stop           = ehci_stop,
    .shutdown       = ehci_shutdown,

    /*
     * managing i/o requests and associated device resources
     */
    .urb_enqueue        = ehci_urb_enqueue,
    .urb_dequeue        = ehci_urb_dequeue,
    .endpoint_disable   = ehci_endpoint_disable,
    .endpoint_reset     = ehci_endpoint_reset,

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

    /*
     * root hub support
     */
    .hub_status_data    = ehci_hub_status_data,
    .hub_control        = ehci_hub_control,
    .bus_suspend        = ehci_bus_suspend,
    .bus_resume     = ehci_bus_resume,
    .relinquish_port    = ehci_relinquish_port,
    .port_handed_over   = ehci_port_handed_over,

    .clear_tt_buffer_complete   = ehci_clear_tt_buffer_complete,
};

static int ehci_hcd_sead3_drv_probe(struct platform_device *pdev)
{
    struct usb_hcd *hcd;
    struct resource *res;
    int ret;

    if (usb_disabled())
        return -ENODEV;

    if (pdev->resource[1].flags != IORESOURCE_IRQ) {
        pr_debug("resource[1] is not IORESOURCE_IRQ");
        return -ENOMEM;
    }
    hcd = usb_create_hcd(&ehci_sead3_hc_driver, &pdev->dev, "SEAD-3");
    if (!hcd)
        return -ENOMEM;

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    hcd->rsrc_start = res->start;
    hcd->rsrc_len = resource_size(res);

    hcd->regs = devm_request_and_ioremap(&pdev->dev, res);
    if (!hcd->regs) {
        pr_debug("ioremap failed");
        ret = -ENOMEM;
        goto err1;
    }

    /* Root hub has integrated TT. */
    hcd->has_tt = 1;

    ret = usb_add_hcd(hcd, pdev->resource[1].start,
              IRQF_SHARED);
    if (ret == 0) {
        platform_set_drvdata(pdev, hcd);
        return ret;
    }

err1:
    usb_put_hcd(hcd);
    return ret;
}

static int ehci_hcd_sead3_drv_remove(struct platform_device *pdev)
{
    struct usb_hcd *hcd = platform_get_drvdata(pdev);

    usb_remove_hcd(hcd);
    usb_put_hcd(hcd);
    platform_set_drvdata(pdev, NULL);

    return 0;
}

#ifdef CONFIG_PM
static int ehci_hcd_sead3_drv_suspend(struct device *dev)
{
    struct usb_hcd *hcd = dev_get_drvdata(dev);
    bool do_wakeup = device_may_wakeup(dev);

    return ehci_suspend(hcd, do_wakeup);
}

static int ehci_hcd_sead3_drv_resume(struct device *dev)
{
    struct usb_hcd *hcd = dev_get_drvdata(dev);

    ehci_resume(hcd, false);
    return 0;
}

static const struct dev_pm_ops sead3_ehci_pmops = {
    .suspend    = ehci_hcd_sead3_drv_suspend,
    .resume     = ehci_hcd_sead3_drv_resume,
};

#define SEAD3_EHCI_PMOPS (&sead3_ehci_pmops)

#else
#define SEAD3_EHCI_PMOPS NULL
#endif

static struct platform_driver ehci_hcd_sead3_driver = {
    .probe      = ehci_hcd_sead3_drv_probe,
    .remove     = ehci_hcd_sead3_drv_remove,
    .shutdown   = usb_hcd_platform_shutdown,
    .driver = {
        .name   = "sead3-ehci",
        .owner  = THIS_MODULE,
        .pm = SEAD3_EHCI_PMOPS,
    }
};

MODULE_ALIAS("platform:sead3-ehci");