ehci-vt8500.c

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/*
 * drivers/usb/host/ehci-vt8500.c
 *
 * Copyright (C) 2010 Alexey Charkov <[email protected]>
 *
 * Based on ehci-au1xxx.c
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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.
 *
 */

#include <linux/of.h>
#include <linux/platform_device.h>

static int ehci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
{
    struct ehci_hcd *ehci = hcd_to_ehci(hcd);
    int rc = 0;

    if (!udev->parent) /* udev is root hub itself, impossible */
        rc = -1;
    /* we only support lpm device connected to root hub yet */
    if (ehci->has_lpm && !udev->parent->parent) {
        rc = ehci_lpm_set_da(ehci, udev->devnum, udev->portnum);
        if (!rc)
            rc = ehci_lpm_check(ehci, udev->portnum);
    }
    return rc;
}

static const struct hc_driver vt8500_ehci_hc_driver = {
    .description        = hcd_name,
    .product_desc       = "VT8500 EHCI",
    .hcd_priv_size      = sizeof(struct ehci_hcd),

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

    /*
     * basic lifecycle operations
     */
    .reset          = ehci_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,

    /*
     * call back when device connected and addressed
     */
    .update_device =    ehci_update_device,

    .clear_tt_buffer_complete   = ehci_clear_tt_buffer_complete,
};

static u64 vt8500_ehci_dma_mask = DMA_BIT_MASK(32);

static int vt8500_ehci_drv_probe(struct platform_device *pdev)
{
    struct usb_hcd *hcd;
    struct ehci_hcd *ehci;
    struct resource *res;
    int ret;

    if (usb_disabled())
        return -ENODEV;

    /*
     * Right now device-tree probed devices don't get dma_mask set.
     * Since shared usb code relies on it, set it here for now.
     * Once we have dma capability bindings this can go away.
     */
    if (!pdev->dev.dma_mask)
        pdev->dev.dma_mask = &vt8500_ehci_dma_mask;

    if (pdev->resource[1].flags != IORESOURCE_IRQ) {
        pr_debug("resource[1] is not IORESOURCE_IRQ");
        return -ENOMEM;
    }
    hcd = usb_create_hcd(&vt8500_ehci_hc_driver, &pdev->dev, "VT8500");
    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;
    }

    ehci = hcd_to_ehci(hcd);
    ehci->caps = hcd->regs;

    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 vt8500_ehci_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;
}

static const struct of_device_id vt8500_ehci_ids[] = {
    { .compatible = "via,vt8500-ehci", },
    { .compatible = "wm,prizm-ehci", },
    {}
};

static struct platform_driver vt8500_ehci_driver = {
    .probe      = vt8500_ehci_drv_probe,
    .remove     = vt8500_ehci_drv_remove,
    .shutdown   = usb_hcd_platform_shutdown,
    .driver = {
        .name   = "vt8500-ehci",
        .owner  = THIS_MODULE,
        .of_match_table = of_match_ptr(vt8500_ehci_ids),
    }
};

MODULE_ALIAS("platform:vt8500-ehci");
MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);