ohci-ppc-soc.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
 * (C) Copyright 2003-2005 MontaVista Software Inc.
 *
 * Bus Glue for PPC On-Chip OHCI driver
 * Tested on Freescale MPC5200 and IBM STB04xxx
 *
 * Modified by Dale Farnsworth <[email protected]> from ohci-sa1111.c
 *
 * This file is licenced under the GPL.
 */

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

/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */

static int usb_hcd_ppc_soc_probe(const struct hc_driver *driver,
              struct platform_device *pdev)
{
    int retval;
    struct usb_hcd *hcd;
    struct ohci_hcd *ohci;
    struct resource *res;
    int irq;

    pr_debug("initializing PPC-SOC USB Controller\n");

    res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
    if (!res) {
        pr_debug("%s: no irq\n", __FILE__);
        return -ENODEV;
    }
    irq = res->start;

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!res) {
        pr_debug("%s: no reg addr\n", __FILE__);
        return -ENODEV;
    }

    hcd = usb_create_hcd(driver, &pdev->dev, "PPC-SOC USB");
    if (!hcd)
        return -ENOMEM;
    hcd->rsrc_start = res->start;
    hcd->rsrc_len = resource_size(res);

    if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
        pr_debug("%s: request_mem_region failed\n", __FILE__);
        retval = -EBUSY;
        goto err1;
    }

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

    ohci = hcd_to_ohci(hcd);
    ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;

#ifdef CONFIG_PPC_MPC52xx
    /* MPC52xx doesn't need frame_no shift */
    ohci->flags |= OHCI_QUIRK_FRAME_NO;
#endif
    ohci_hcd_init(ohci);

    retval = usb_add_hcd(hcd, irq, 0);
    if (retval == 0)
        return retval;

    pr_debug("Removing PPC-SOC USB Controller\n");

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


/* may be called without controller electrically present */
/* may be called with controller, bus, and devices active */

static void usb_hcd_ppc_soc_remove(struct usb_hcd *hcd,
        struct platform_device *pdev)
{
    usb_remove_hcd(hcd);

    pr_debug("stopping PPC-SOC USB Controller\n");

    iounmap(hcd->regs);
    release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
    usb_put_hcd(hcd);
}

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

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

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

    return 0;
}

static const struct hc_driver ohci_ppc_soc_hc_driver = {
    .description =      hcd_name,
    .hcd_priv_size =    sizeof(struct ohci_hcd),

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

    /*
     * basic lifecycle operations
     */
    .start =        ohci_ppc_soc_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_ppc_soc_drv_probe(struct platform_device *pdev)
{
    int ret;

    if (usb_disabled())
        return -ENODEV;

    ret = usb_hcd_ppc_soc_probe(&ohci_ppc_soc_hc_driver, pdev);
    return ret;
}

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

    usb_hcd_ppc_soc_remove(hcd, pdev);
    return 0;
}

static struct platform_driver ohci_hcd_ppc_soc_driver = {
    .probe      = ohci_hcd_ppc_soc_drv_probe,
    .remove     = ohci_hcd_ppc_soc_drv_remove,
    .shutdown   = usb_hcd_platform_shutdown,
#ifdef  CONFIG_PM
    /*.suspend  = ohci_hcd_ppc_soc_drv_suspend,*/
    /*.resume   = ohci_hcd_ppc_soc_drv_resume,*/
#endif
    .driver     = {
        .name   = "ppc-soc-ohci",
        .owner  = THIS_MODULE,
    },
};

MODULE_ALIAS("platform:ppc-soc-ohci");