/*
 * OHCI HCD (Host Controller Driver) for USB.
 *
 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
 * (C) Copyright 2002 Hewlett-Packard Company
 *
 * Bus Glue for Sharp LH7A404
 *
 * Written by Christopher Hoover <ch@hpl.hp.com>
 * Based on fragments of previous driver by Russell King et al.
 *
 * Modified for LH7A404 from ohci-sa1111.c
 *  by Durgesh Pattamatta <pattamattad@sharpsec.com>
 *
 * This file is licenced under the GPL.
 */

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

#include <mach/hardware.h>


extern int usb_disabled(void);

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

static void lh7a404_start_hc(struct platform_device *dev)
{
        printk(KERN_DEBUG __FILE__
               ": starting LH7A404 OHCI USB Controller\n");

        /*
         * Now, carefully enable the USB clock, and take
         * the USB host controller out of reset.
         */
        CSC_PWRCNT |= CSC_PWRCNT_USBH_EN; /* Enable clock */
        udelay(1000);
        USBH_CMDSTATUS = OHCI_HCR;

        printk(KERN_DEBUG __FILE__
                   ": Clock to USB host has been enabled \n");
}

static void lh7a404_stop_hc(struct platform_device *dev)
{
        printk(KERN_DEBUG __FILE__
               ": stopping LH7A404 OHCI USB Controller\n");

        CSC_PWRCNT &= ~CSC_PWRCNT_USBH_EN; /* Disable clock */
}


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

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


/**
 * usb_hcd_lh7a404_probe - initialize LH7A404-based HCDs
 * Context: !in_interrupt()
 *
 * Allocates basic resources for this USB host controller, and
 * then invokes the start() method for the HCD associated with it
 * through the hotplug entry's driver_data.
 *
 */
int usb_hcd_lh7a404_probe (const struct hc_driver *driver,
                          struct platform_device *dev)
{
        int retval;
        struct usb_hcd *hcd;

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

        hcd = usb_create_hcd(driver, &dev->dev, "lh7a404");
        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)) {
                pr_debug("request_mem_region failed");
                retval = -EBUSY;
                goto err1;
        }

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

        lh7a404_start_hc(dev);
        ohci_hcd_init(hcd_to_ohci(hcd));

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

        lh7a404_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 */

/**
 * usb_hcd_lh7a404_remove - shutdown processing for LH7A404-based HCDs
 * @dev: USB Host Controller being removed
 * Context: !in_interrupt()
 *
 * Reverses the effect of usb_hcd_lh7a404_probe(), first invoking
 * the HCD's stop() method.  It is always called from a thread
 * context, normally "rmmod", "apmd", or something similar.
 *
 */
void usb_hcd_lh7a404_remove (struct usb_hcd *hcd, struct platform_device *dev)
{
        usb_remove_hcd(hcd);
        lh7a404_stop_hc(dev);
        iounmap(hcd->regs);
        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
        usb_put_hcd(hcd);
}

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

static int __devinit
ohci_lh7a404_start (struct usb_hcd *hcd)
{
        struct ohci_hcd *ohci = hcd_to_ohci (hcd);
        int             ret;

        ohci_dbg (ohci, "ohci_lh7a404_start, ohci:%p", ohci);
        if ((ret = ohci_init(ohci)) < 0)
                return ret;

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

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

static const struct hc_driver ohci_lh7a404_hc_driver = {
        .description =          hcd_name,
        .product_desc =         "LH7A404 OHCI",
        .hcd_priv_size =        sizeof(struct ohci_hcd),

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

        /*
         * basic lifecycle operations
         */
        .start =                ohci_lh7a404_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_lh7a404_drv_probe(struct platform_device *pdev)
{
        int ret;

        pr_debug ("In ohci_hcd_lh7a404_drv_probe");

        if (usb_disabled())
                return -ENODEV;

        ret = usb_hcd_lh7a404_probe(&ohci_lh7a404_hc_driver, pdev);
        return ret;
}

static int ohci_hcd_lh7a404_drv_remove(struct platform_device *pdev)
{
        struct usb_hcd *hcd = platform_get_drvdata(pdev);

        usb_hcd_lh7a404_remove(hcd, pdev);
        return 0;
}
        /*TBD*/
/*static int ohci_hcd_lh7a404_drv_suspend(struct platform_device *dev)
{
        struct usb_hcd *hcd = platform_get_drvdata(dev);

        return 0;
}
static int ohci_hcd_lh7a404_drv_resume(struct platform_device *dev)
{
        struct usb_hcd *hcd = platform_get_drvdata(dev);


        return 0;
}
*/

static struct platform_driver ohci_hcd_lh7a404_driver = {
        .probe          = ohci_hcd_lh7a404_drv_probe,
        .remove         = ohci_hcd_lh7a404_drv_remove,
        .shutdown       = usb_hcd_platform_shutdown,
        /*.suspend      = ohci_hcd_lh7a404_drv_suspend, */
        /*.resume       = ohci_hcd_lh7a404_drv_resume, */
        .driver         = {
                .name   = "lh7a404-ohci",
                .owner  = THIS_MODULE,
        },
};

MODULE_ALIAS("platform:lh7a404-ohci");