ohci-ppc-of.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 2006 Sylvain Munaut <[email protected]>
 *
 * Bus glue for OHCI HC on the of_platform bus
 *
 * Modified for of_platform bus from ohci-sa1111.c
 *
 * This file is licenced under the GPL.
 */

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

#include <asm/prom.h>


static int __devinit
ohci_ppc_of_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_of_hc_driver = {
    .description =      hcd_name,
    .product_desc =     "OF OHCI",
    .hcd_priv_size =    sizeof(struct ohci_hcd),

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

    /*
     * basic lifecycle operations
     */
    .start =        ohci_ppc_of_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 __devinit ohci_hcd_ppc_of_probe(struct platform_device *op)
{
    struct device_node *dn = op->dev.of_node;
    struct usb_hcd *hcd;
    struct ohci_hcd *ohci;
    struct resource res;
    int irq;

    int rv;
    int is_bigendian;
    struct device_node *np;

    if (usb_disabled())
        return -ENODEV;

    is_bigendian =
        of_device_is_compatible(dn, "ohci-bigendian") ||
        of_device_is_compatible(dn, "ohci-be");

    dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");

    rv = of_address_to_resource(dn, 0, &res);
    if (rv)
        return rv;

    hcd = usb_create_hcd(&ohci_ppc_of_hc_driver, &op->dev, "PPC-OF 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)) {
        printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
        rv = -EBUSY;
        goto err_rmr;
    }

    irq = irq_of_parse_and_map(dn, 0);
    if (irq == NO_IRQ) {
        printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
        rv = -EBUSY;
        goto err_irq;
    }

    hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
    if (!hcd->regs) {
        printk(KERN_ERR "%s: ioremap failed\n", __FILE__);
        rv = -ENOMEM;
        goto err_ioremap;
    }

    ohci = hcd_to_ohci(hcd);
    if (is_bigendian) {
        ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
        if (of_device_is_compatible(dn, "fsl,mpc5200-ohci"))
            ohci->flags |= OHCI_QUIRK_FRAME_NO;
        if (of_device_is_compatible(dn, "mpc5200-ohci"))
            ohci->flags |= OHCI_QUIRK_FRAME_NO;
    }

    ohci_hcd_init(ohci);

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

    /* by now, 440epx is known to show usb_23 erratum */
    np = of_find_compatible_node(NULL, NULL, "ibm,usb-ehci-440epx");

    /* Work around - At this point ohci_run has executed, the
    * controller is running, everything, the root ports, etc., is
    * set up.  If the ehci driver is loaded, put the ohci core in
    * the suspended state.  The ehci driver will bring it out of
    * suspended state when / if a non-high speed USB device is
    * attached to the USB Host port.  If the ehci driver is not
    * loaded, do nothing. request_mem_region is used to test if
    * the ehci driver is loaded.
    */
    if (np !=  NULL) {
        if (!of_address_to_resource(np, 0, &res)) {
            if (!request_mem_region(res.start, 0x4, hcd_name)) {
                writel_be((readl_be(&ohci->regs->control) |
                    OHCI_USB_SUSPEND), &ohci->regs->control);
                    (void) readl_be(&ohci->regs->control);
            } else
                release_mem_region(res.start, 0x4);
        } else
            pr_debug("%s: cannot get ehci offset from fdt\n", __FILE__);
    }

    iounmap(hcd->regs);
err_ioremap:
    irq_dispose_mapping(irq);
err_irq:
    release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err_rmr:
    usb_put_hcd(hcd);

    return rv;
}

static int ohci_hcd_ppc_of_remove(struct platform_device *op)
{
    struct usb_hcd *hcd = dev_get_drvdata(&op->dev);
    dev_set_drvdata(&op->dev, NULL);

    dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");

    usb_remove_hcd(hcd);

    iounmap(hcd->regs);
    irq_dispose_mapping(hcd->irq);
    release_mem_region(hcd->rsrc_start, hcd->rsrc_len);

    usb_put_hcd(hcd);

    return 0;
}

static void ohci_hcd_ppc_of_shutdown(struct platform_device *op)
{
    struct usb_hcd *hcd = dev_get_drvdata(&op->dev);

        if (hcd->driver->shutdown)
                hcd->driver->shutdown(hcd);
}


static const struct of_device_id ohci_hcd_ppc_of_match[] = {
#ifdef CONFIG_USB_OHCI_HCD_PPC_OF_BE
    {
        .name = "usb",
        .compatible = "ohci-bigendian",
    },
    {
        .name = "usb",
        .compatible = "ohci-be",
    },
#endif
#ifdef CONFIG_USB_OHCI_HCD_PPC_OF_LE
    {
        .name = "usb",
        .compatible = "ohci-littledian",
    },
    {
        .name = "usb",
        .compatible = "ohci-le",
    },
#endif
    {},
};
MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match);

#if !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \
    !defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE)
#error "No endianness selected for ppc-of-ohci"
#endif


static struct platform_driver ohci_hcd_ppc_of_driver = {
    .probe      = ohci_hcd_ppc_of_probe,
    .remove     = ohci_hcd_ppc_of_remove,
    .shutdown   = ohci_hcd_ppc_of_shutdown,
    .driver = {
        .name = "ppc-of-ohci",
        .owner = THIS_MODULE,
        .of_match_table = ohci_hcd_ppc_of_match,
    },
};