ohci-pnx8550.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 2005 Embedded Alley Solutions, Inc.
 *
 * Bus Glue for PNX8550
 *
 * 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 PNX8550 from ohci-sa1111.c and sa-omap.c
 *  by Vitaly Wool <[email protected]>
 *
 * This file is licenced under the GPL.
 */

#include <linux/device.h>
#include <linux/platform_device.h>
#include <asm/mach-pnx8550/usb.h>
#include <asm/mach-pnx8550/int.h>
#include <asm/mach-pnx8550/pci.h>

#ifndef CONFIG_PNX8550
#error "This file is PNX8550 bus glue.  CONFIG_PNX8550 must be defined."
#endif

extern int usb_disabled(void);

/*-------------------------------------------------------------------------*/

static void pnx8550_start_hc(struct platform_device *dev)
{
    /*
     * Set register CLK48CTL to enable and 48MHz
     */
    outl(0x00000003, PCI_BASE | 0x0004770c);

    /*
     * Set register CLK12CTL to enable and 48MHz
     */
    outl(0x00000003, PCI_BASE | 0x00047710);

    udelay(100);
}

static void pnx8550_stop_hc(struct platform_device *dev)
{
    udelay(10);
}


/*-------------------------------------------------------------------------*/

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


int usb_hcd_pnx8550_probe (const struct hc_driver *driver,
              struct platform_device *dev)
{
    int retval;
    struct usb_hcd *hcd;

    if (dev->resource[0].flags != IORESOURCE_MEM ||
            dev->resource[1].flags != IORESOURCE_IRQ) {
        dev_err (&dev->dev,"invalid resource type\n");
        return -ENOMEM;
    }

    hcd = usb_create_hcd (driver, &dev->dev, "pnx8550");
    if (!hcd)
        return -ENOMEM;
    hcd->rsrc_start = dev->resource[0].start;
    hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;

    if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
        dev_err(&dev->dev, "request_mem_region [0x%08llx, 0x%08llx] "
                "failed\n", hcd->rsrc_start, hcd->rsrc_len);
        retval = -EBUSY;
        goto err1;
    }

    hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
    if (!hcd->regs) {
        dev_err(&dev->dev, "ioremap [[0x%08llx, 0x%08llx] failed\n",
                hcd->rsrc_start, hcd->rsrc_len);
        retval = -ENOMEM;
        goto err2;
    }

    pnx8550_start_hc(dev);

    ohci_hcd_init(hcd_to_ohci(hcd));

    retval = usb_add_hcd(hcd, dev->resource[1].start, 0);
    if (retval == 0)
        return retval;

    pnx8550_stop_hc(dev);
    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 */

void usb_hcd_pnx8550_remove (struct usb_hcd *hcd, struct platform_device *dev)
{
    usb_remove_hcd(hcd);
    pnx8550_stop_hc(dev);
    iounmap(hcd->regs);
    release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
    usb_put_hcd(hcd);
}

/*-------------------------------------------------------------------------*/

static int __devinit
ohci_pnx8550_start (struct usb_hcd *hcd)
{
    struct ohci_hcd *ohci = hcd_to_ohci (hcd);
    int     ret;

    ohci_dbg (ohci, "ohci_pnx8550_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_pnx8550_hc_driver = {
    .description =      hcd_name,
    .product_desc =     "PNX8550 OHCI",
    .hcd_priv_size =    sizeof(struct ohci_hcd),

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

    /*
     * basic lifecycle operations
     */
    .start =        ohci_pnx8550_start,
    .stop =         ohci_stop,

    /*
     * 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_pnx8550_drv_probe(struct platform_device *pdev)
{
    int ret;

    if (usb_disabled())
        return -ENODEV;

    ret = usb_hcd_pnx8550_probe(&ohci_pnx8550_hc_driver, pdev);
    return ret;
}

static int ohci_hcd_pnx8550_drv_remove(struct platform_device *pdev)
{
    struct usb_hcd *hcd = platform_get_drvdata(pdev);

    usb_hcd_pnx8550_remove(hcd, pdev);
    return 0;
}

MODULE_ALIAS("platform:pnx8550-ohci");

static struct platform_driver ohci_hcd_pnx8550_driver = {
    .driver = {
        .name   = "pnx8550-ohci",
        .owner  = THIS_MODULE,
    },
    .probe      = ohci_hcd_pnx8550_drv_probe,
    .remove     = ohci_hcd_pnx8550_drv_remove,
};