ohci-au1xxx.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 AMD Alchemy Au1xxx
 *
 * 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 AMD Alchemy Au1xxx
 *  by Matt Porter <[email protected]>
 *
 * This file is licenced under the GPL.
 */

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

#include <asm/mach-au1x00/au1000.h>


extern int usb_disabled(void);

static int __devinit ohci_au1xxx_start(struct usb_hcd *hcd)
{
    struct ohci_hcd *ohci = hcd_to_ohci(hcd);
    int ret;

    ohci_dbg(ohci, "ohci_au1xxx_start, ohci:%p", ohci);

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

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

    return 0;
}

static const struct hc_driver ohci_au1xxx_hc_driver = {
    .description =      hcd_name,
    .product_desc =     "Au1xxx OHCI",
    .hcd_priv_size =    sizeof(struct ohci_hcd),

    /*
     * generic hardware linkage
     */
    .irq =          ohci_irq,
    .flags =        HCD_USB11 | HCD_MEMORY,

    /*
     * basic lifecycle operations
     */
    .start =        ohci_au1xxx_start,
    .stop =         ohci_stop,
    .shutdown =     ohci_shutdown,

    /*
     * managing i/o requests and associated device resources
     */
    .urb_enqueue =      ohci_urb_enqueue,
    .urb_dequeue =      ohci_urb_dequeue,
    .endpoint_disable = ohci_endpoint_disable,

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

    /*
     * root hub support
     */
    .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,
};

static int ohci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
{
    int ret, unit;
    struct usb_hcd *hcd;

    if (usb_disabled())
        return -ENODEV;

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

    hcd = usb_create_hcd(&ohci_au1xxx_hc_driver, &pdev->dev, "au1xxx");
    if (!hcd)
        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)) {
        pr_debug("request_mem_region failed\n");
        ret = -EBUSY;
        goto err1;
    }

    hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
    if (!hcd->regs) {
        pr_debug("ioremap failed\n");
        ret = -ENOMEM;
        goto err2;
    }

    unit = (hcd->rsrc_start == AU1300_USB_OHCI1_PHYS_ADDR) ?
            ALCHEMY_USB_OHCI1 : ALCHEMY_USB_OHCI0;
    if (alchemy_usb_control(unit, 1)) {
        printk(KERN_INFO "%s: controller init failed!\n", pdev->name);
        ret = -ENODEV;
        goto err3;
    }

    ohci_hcd_init(hcd_to_ohci(hcd));

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

    alchemy_usb_control(unit, 0);
err3:
    iounmap(hcd->regs);
err2:
    release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err1:
    usb_put_hcd(hcd);
    return ret;
}

static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
{
    struct usb_hcd *hcd = platform_get_drvdata(pdev);
    int unit;

    unit = (hcd->rsrc_start == AU1300_USB_OHCI1_PHYS_ADDR) ?
            ALCHEMY_USB_OHCI1 : ALCHEMY_USB_OHCI0;
    usb_remove_hcd(hcd);
    alchemy_usb_control(unit, 0);
    iounmap(hcd->regs);
    release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
    usb_put_hcd(hcd);
    platform_set_drvdata(pdev, NULL);

    return 0;
}

#ifdef CONFIG_PM
static int ohci_hcd_au1xxx_drv_suspend(struct device *dev)
{
    struct usb_hcd *hcd = dev_get_drvdata(dev);
    struct ohci_hcd *ohci = hcd_to_ohci(hcd);
    unsigned long flags;
    int rc;

    rc = 0;

    /* Root hub was already suspended. Disable irq emission and
     * mark HW unaccessible, bail out if RH has been resumed. Use
     * the spinlock to properly synchronize with possible pending
     * RH suspend or resume activity.
     */
    spin_lock_irqsave(&ohci->lock, flags);
    if (ohci->rh_state != OHCI_RH_SUSPENDED) {
        rc = -EINVAL;
        goto bail;
    }
    ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
    (void)ohci_readl(ohci, &ohci->regs->intrdisable);

    clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);

    alchemy_usb_control(ALCHEMY_USB_OHCI0, 0);
bail:
    spin_unlock_irqrestore(&ohci->lock, flags);

    return rc;
}

static int ohci_hcd_au1xxx_drv_resume(struct device *dev)
{
    struct usb_hcd *hcd = dev_get_drvdata(dev);

    alchemy_usb_control(ALCHEMY_USB_OHCI0, 1);

    set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
    ohci_finish_controller_resume(hcd);

    return 0;
}

static const struct dev_pm_ops au1xxx_ohci_pmops = {
    .suspend    = ohci_hcd_au1xxx_drv_suspend,
    .resume     = ohci_hcd_au1xxx_drv_resume,
};

#define AU1XXX_OHCI_PMOPS &au1xxx_ohci_pmops

#else
#define AU1XXX_OHCI_PMOPS NULL
#endif

static struct platform_driver ohci_hcd_au1xxx_driver = {
    .probe      = ohci_hcd_au1xxx_drv_probe,
    .remove     = ohci_hcd_au1xxx_drv_remove,
    .shutdown   = usb_hcd_platform_shutdown,
    .driver     = {
        .name   = "au1xxx-ohci",
        .owner  = THIS_MODULE,
        .pm = AU1XXX_OHCI_PMOPS,
    },
};

MODULE_ALIAS("platform:au1xxx-ohci");