ehci-ls1x.c

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/*
 *  Bus Glue for Loongson LS1X built-in EHCI controller.
 *
 *  Copyright (c) 2012 Zhang, Keguang <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License version 2 as published
 *  by the Free Software Foundation.
 */


#include <linux/platform_device.h>

static int ehci_ls1x_reset(struct usb_hcd *hcd)
{
    struct ehci_hcd *ehci = hcd_to_ehci(hcd);
    int ret;

    ehci->caps = hcd->regs;

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

    ehci_port_power(ehci, 0);

    return 0;
}

static const struct hc_driver ehci_ls1x_hc_driver = {
    .description        = hcd_name,
    .product_desc       = "LOONGSON1 EHCI",
    .hcd_priv_size      = sizeof(struct ehci_hcd),

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

    /*
     * basic lifecycle operations
     */
    .reset          = ehci_ls1x_reset,
    .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,
    .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_ls1x_probe(struct platform_device *pdev)
{
    struct usb_hcd *hcd;
    struct resource *res;
    int irq;
    int ret;

    pr_debug("initializing loongson1 ehci USB Controller\n");

    if (usb_disabled())
        return -ENODEV;

    res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
    if (!res) {
        dev_err(&pdev->dev,
            "Found HC with no IRQ. Check %s setup!\n",
            dev_name(&pdev->dev));
        return -ENODEV;
    }
    irq = res->start;

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!res) {
        dev_err(&pdev->dev,
            "Found HC with no register addr. Check %s setup!\n",
            dev_name(&pdev->dev));
        return -ENODEV;
    }

    hcd = usb_create_hcd(&ehci_ls1x_hc_driver, &pdev->dev,
                dev_name(&pdev->dev));
    if (!hcd)
        return -ENOMEM;
    hcd->rsrc_start = res->start;
    hcd->rsrc_len   = resource_size(res);

    hcd->regs = devm_request_and_ioremap(&pdev->dev, res);
    if (hcd->regs == NULL) {
        dev_dbg(&pdev->dev, "error mapping memory\n");
        ret = -EFAULT;
        goto err_put_hcd;
    }

    ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
    if (ret)
        goto err_put_hcd;

    return ret;

err_put_hcd:
    usb_put_hcd(hcd);
    return ret;
}

static int ehci_hcd_ls1x_remove(struct platform_device *pdev)
{
    struct usb_hcd *hcd = platform_get_drvdata(pdev);

    usb_remove_hcd(hcd);
    usb_put_hcd(hcd);

    return 0;
}

static struct platform_driver ehci_ls1x_driver = {
    .probe = ehci_hcd_ls1x_probe,
    .remove = ehci_hcd_ls1x_remove,
    .shutdown = usb_hcd_platform_shutdown,
    .driver = {
        .name = "ls1x-ehci",
        .owner  = THIS_MODULE,
    },
};

MODULE_ALIAS(PLATFORM_MODULE_PREFIX "ls1x-ehci");