ehci-w90x900.c

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/*
 * linux/driver/usb/host/ehci-w90x900.c
 *
 * Copyright (c) 2008 Nuvoton technology corporation.
 *
 * Wan ZongShun <[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;version 2 of the License.
 *
 */

#include <linux/platform_device.h>

/*ebable phy0 and phy1 for w90p910*/
#define ENPHY       (0x01<<8)
#define PHY0_CTR    (0xA4)
#define PHY1_CTR    (0xA8)

static int __devinit usb_w90x900_probe(const struct hc_driver *driver,
              struct platform_device *pdev)
{
    struct usb_hcd *hcd;
    struct ehci_hcd *ehci;
    struct resource *res;
    int retval = 0, irq;
    unsigned long val;


    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!res) {
        retval = -ENXIO;
        goto err1;
    }

    hcd = usb_create_hcd(driver, &pdev->dev, "w90x900 EHCI");
    if (!hcd) {
        retval = -ENOMEM;
        goto err1;
    }

    hcd->rsrc_start = res->start;
    hcd->rsrc_len = resource_size(res);

    if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
        retval = -EBUSY;
        goto err2;
    }

    hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
    if (hcd->regs == NULL) {
        retval = -EFAULT;
        goto err3;
    }

    ehci = hcd_to_ehci(hcd);
    ehci->caps = hcd->regs;
    ehci->regs = hcd->regs +
        HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));

    /* enable PHY 0,1,the regs only apply to w90p910
    *  0xA4,0xA8 were offsets of PHY0 and PHY1 controller of
    *  w90p910 IC relative to ehci->regs.
    */
    val = __raw_readl(ehci->regs+PHY0_CTR);
    val |= ENPHY;
    __raw_writel(val, ehci->regs+PHY0_CTR);

    val = __raw_readl(ehci->regs+PHY1_CTR);
    val |= ENPHY;
    __raw_writel(val, ehci->regs+PHY1_CTR);

    irq = platform_get_irq(pdev, 0);
    if (irq < 0)
        goto err4;

    retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
    if (retval != 0)
        goto err4;

    return retval;
err4:
    iounmap(hcd->regs);
err3:
    release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err2:
    usb_put_hcd(hcd);
err1:
    return retval;
}

static
void usb_w90x900_remove(struct usb_hcd *hcd, struct platform_device *pdev)
{
    usb_remove_hcd(hcd);
    iounmap(hcd->regs);
    release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
    usb_put_hcd(hcd);
}

static const struct hc_driver ehci_w90x900_hc_driver = {
    .description = hcd_name,
    .product_desc = "Nuvoton w90x900 EHCI Host Controller",
    .hcd_priv_size = sizeof(struct ehci_hcd),

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

    /*
     * 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,
#ifdef  CONFIG_PM
    .bus_suspend = ehci_bus_suspend,
    .bus_resume = ehci_bus_resume,
#endif
    .relinquish_port    = ehci_relinquish_port,
    .port_handed_over   = ehci_port_handed_over,

    .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};

static int __devinit ehci_w90x900_probe(struct platform_device *pdev)
{
    if (usb_disabled())
        return -ENODEV;

    return usb_w90x900_probe(&ehci_w90x900_hc_driver, pdev);
}

static int __devexit ehci_w90x900_remove(struct platform_device *pdev)
{
    struct usb_hcd *hcd = platform_get_drvdata(pdev);

    usb_w90x900_remove(hcd, pdev);

    return 0;
}

static struct platform_driver ehci_hcd_w90x900_driver = {
    .probe  = ehci_w90x900_probe,
    .remove = __devexit_p(ehci_w90x900_remove),
    .driver = {
        .name = "w90x900-ehci",
        .owner = THIS_MODULE,
    },
};

MODULE_AUTHOR("Wan ZongShun <[email protected]>");
MODULE_DESCRIPTION("w90p910 usb ehci driver!");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:w90p910-ehci");