/*
 * 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 ep93xx.
 *
 * 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>
 *
 * Modified for pxa27x from ohci-lh7a404.c
 *  by Nick Bane <nick@cecomputing.co.uk> 26-8-2004
 *
 * Modified for ep93xx from ohci-pxa27x.c
 *  by Lennert Buytenhek <buytenh@wantstofly.org> 28-2-2006
 *  Based on an earlier driver by Ray Lehtiniemi
 *
 * This file is licenced under the GPL.
 */

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

static struct clk *usb_host_clock;

static int ohci_ep93xx_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 struct hc_driver ohci_ep93xx_hc_driver = {
	.description		= hcd_name,
	.product_desc		= "EP93xx OHCI",
	.hcd_priv_size		= sizeof(struct ohci_hcd),
	.irq			= ohci_irq,
	.flags			= HCD_USB11 | HCD_MEMORY,
	.start			= ohci_ep93xx_start,
	.stop			= ohci_stop,
	.shutdown		= ohci_shutdown,
	.urb_enqueue		= ohci_urb_enqueue,
	.urb_dequeue		= ohci_urb_dequeue,
	.endpoint_disable	= ohci_endpoint_disable,
	.get_frame_number	= ohci_get_frame,
	.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_ep93xx_drv_probe(struct platform_device *pdev)
{
	struct usb_hcd *hcd;
	struct resource *res;
	int irq;
	int ret;

	if (usb_disabled())
		return -ENODEV;

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

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

	hcd = usb_create_hcd(&ohci_ep93xx_hc_driver, &pdev->dev, "ep93xx");
	if (!hcd)
		return -ENOMEM;

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);

	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(hcd->regs)) {
		ret = PTR_ERR(hcd->regs);
		goto err_put_hcd;
	}

	usb_host_clock = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(usb_host_clock)) {
		ret = PTR_ERR(usb_host_clock);
		goto err_put_hcd;
	}

	clk_enable(usb_host_clock);

	ohci_hcd_init(hcd_to_ohci(hcd));

	ret = usb_add_hcd(hcd, irq, 0);
	if (ret)
		goto err_clk_disable;

	return 0;

err_clk_disable:
	clk_disable(usb_host_clock);
err_put_hcd:
	usb_put_hcd(hcd);

	return ret;
}

static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	usb_remove_hcd(hcd);
	clk_disable(usb_host_clock);
	usb_put_hcd(hcd);

	return 0;
}

#ifdef CONFIG_PM
static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct ohci_hcd *ohci = hcd_to_ohci(hcd);

	if (time_before(jiffies, ohci->next_statechange))
		msleep(5);
	ohci->next_statechange = jiffies;

	clk_disable(usb_host_clock);
	return 0;
}

static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct ohci_hcd *ohci = hcd_to_ohci(hcd);

	if (time_before(jiffies, ohci->next_statechange))
		msleep(5);
	ohci->next_statechange = jiffies;

	clk_enable(usb_host_clock);

	ohci_resume(hcd, false);
	return 0;
}
#endif


static struct platform_driver ohci_hcd_ep93xx_driver = {
	.probe		= ohci_hcd_ep93xx_drv_probe,
	.remove		= ohci_hcd_ep93xx_drv_remove,
	.shutdown	= usb_hcd_platform_shutdown,
#ifdef CONFIG_PM
	.suspend	= ohci_hcd_ep93xx_drv_suspend,
	.resume		= ohci_hcd_ep93xx_drv_resume,
#endif
	.driver		= {
		.name	= "ep93xx-ohci",
		.owner	= THIS_MODULE,
	},
};

MODULE_ALIAS("platform:ep93xx-ohci");