/*
 * xhci-plat.c - xHCI host controller driver platform Bus Glue.
 *
 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
 * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
 *
 * A lot of code borrowed from the Linux xHCI driver.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 */

#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/slab.h>

#include "xhci.h"

static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
{
        /*
         * As of now platform drivers don't provide MSI support so we ensure
         * here that the generic code does not try to make a pci_dev from our
         * dev struct in order to setup MSI
         */
        xhci->quirks |= XHCI_BROKEN_MSI;
}

/* called during probe() after chip reset completes */
static int xhci_plat_setup(struct usb_hcd *hcd)
{
        return xhci_gen_setup(hcd, xhci_plat_quirks);
}

static const struct hc_driver xhci_plat_xhci_driver = {
        .description =          "xhci-hcd",
        .product_desc =         "xHCI Host Controller",
        .hcd_priv_size =        sizeof(struct xhci_hcd *),

        /*
         * generic hardware linkage
         */
        .irq =                  xhci_irq,
        .flags =                HCD_MEMORY | HCD_USB3 | HCD_SHARED,

        /*
         * basic lifecycle operations
         */
        .reset =                xhci_plat_setup,
        .start =                xhci_run,
        .stop =                 xhci_stop,
        .shutdown =             xhci_shutdown,

        /*
         * managing i/o requests and associated device resources
         */
        .urb_enqueue =          xhci_urb_enqueue,
        .urb_dequeue =          xhci_urb_dequeue,
        .alloc_dev =            xhci_alloc_dev,
        .free_dev =             xhci_free_dev,
        .alloc_streams =        xhci_alloc_streams,
        .free_streams =         xhci_free_streams,
        .add_endpoint =         xhci_add_endpoint,
        .drop_endpoint =        xhci_drop_endpoint,
        .endpoint_reset =       xhci_endpoint_reset,
        .check_bandwidth =      xhci_check_bandwidth,
        .reset_bandwidth =      xhci_reset_bandwidth,
        .address_device =       xhci_address_device,
        .update_hub_device =    xhci_update_hub_device,
        .reset_device =         xhci_discover_or_reset_device,

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

        /* Root hub support */
        .hub_control =          xhci_hub_control,
        .hub_status_data =      xhci_hub_status_data,
        .bus_suspend =          xhci_bus_suspend,
        .bus_resume =           xhci_bus_resume,
};

static int xhci_plat_probe(struct platform_device *pdev)
{
        const struct hc_driver  *driver;
        struct xhci_hcd         *xhci;
        struct resource         *res;
        struct usb_hcd          *hcd;
        int                     ret;
        int                     irq;

        if (usb_disabled())
                return -ENODEV;

        driver = &xhci_plat_xhci_driver;

        irq = platform_get_irq(pdev, 0);
        if (irq < 0)
                return -ENODEV;

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!res)
                return -ENODEV;

        hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
        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,
                                driver->description)) {
                dev_dbg(&pdev->dev, "controller already in use\n");
                ret = -EBUSY;
                goto put_hcd;
        }

        hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
        if (!hcd->regs) {
                dev_dbg(&pdev->dev, "error mapping memory\n");
                ret = -EFAULT;
                goto release_mem_region;
        }

        ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
        if (ret)
                goto unmap_registers;

        /* USB 2.0 roothub is stored in the platform_device now. */
        hcd = dev_get_drvdata(&pdev->dev);
        xhci = hcd_to_xhci(hcd);
        xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
                        dev_name(&pdev->dev), hcd);
        if (!xhci->shared_hcd) {
                ret = -ENOMEM;
                goto dealloc_usb2_hcd;
        }

        /*
         * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset)
         * is called by usb_add_hcd().
         */
        *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;

        ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
        if (ret)
                goto put_usb3_hcd;

        return 0;

put_usb3_hcd:
        usb_put_hcd(xhci->shared_hcd);

dealloc_usb2_hcd:
        usb_remove_hcd(hcd);

unmap_registers:
        iounmap(hcd->regs);

release_mem_region:
        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);

put_hcd:
        usb_put_hcd(hcd);

        return ret;
}

static int xhci_plat_remove(struct platform_device *dev)
{
        struct usb_hcd  *hcd = platform_get_drvdata(dev);
        struct xhci_hcd *xhci = hcd_to_xhci(hcd);

        usb_remove_hcd(xhci->shared_hcd);
        usb_put_hcd(xhci->shared_hcd);

        usb_remove_hcd(hcd);
        iounmap(hcd->regs);
        usb_put_hcd(hcd);
        kfree(xhci);

        return 0;
}

static struct platform_driver usb_xhci_driver = {
        .probe  = xhci_plat_probe,
        .remove = xhci_plat_remove,
        .driver = {
                .name = "xhci-hcd",
        },
};
MODULE_ALIAS("platform:xhci-hcd");

int xhci_register_plat(void)
{
        return platform_driver_register(&usb_xhci_driver);
}

void xhci_unregister_plat(void)
{
        platform_driver_unregister(&usb_xhci_driver);
}