/*
 * SAMSUNG S5P USB HOST EHCI Controller
 *
 * Copyright (C) 2011 Samsung Electronics Co.Ltd
 * Author: Jingoo Han <jg1.han@samsung.com>
 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */

#include <linux/clk.h>
#include <linux/platform_device.h>
#include <mach/regs-pmu.h>
#include <plat/cpu.h>
#include <plat/ehci.h>
#include <plat/usb-phy.h>

struct s5p_ehci_hcd {
	struct device *dev;
	struct usb_hcd *hcd;
	struct clk *clk;
};

static const struct hc_driver s5p_ehci_hc_driver = {
	.description		= hcd_name,
	.product_desc		= "S5P EHCI Host Controller",
	.hcd_priv_size		= sizeof(struct ehci_hcd),

	.irq			= ehci_irq,
	.flags			= HCD_MEMORY | HCD_USB2,

	.reset			= ehci_init,
	.start			= ehci_run,
	.stop			= ehci_stop,
	.shutdown		= ehci_shutdown,

	.get_frame_number	= ehci_get_frame,

	.urb_enqueue		= ehci_urb_enqueue,
	.urb_dequeue		= ehci_urb_dequeue,
	.endpoint_disable	= ehci_endpoint_disable,
	.endpoint_reset		= ehci_endpoint_reset,

	.hub_status_data	= ehci_hub_status_data,
	.hub_control		= ehci_hub_control,
	.bus_suspend		= ehci_bus_suspend,
	.bus_resume		= ehci_bus_resume,

	.relinquish_port	= ehci_relinquish_port,
	.port_handed_over	= ehci_port_handed_over,

	.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,
};

static int s5p_ehci_probe(struct platform_device *pdev)
{
	struct s5p_ehci_platdata *pdata;
	struct s5p_ehci_hcd *s5p_ehci;
	struct usb_hcd *hcd;
	struct ehci_hcd *ehci;
	struct resource *res;
	int irq;
	int err;

	pdata = pdev->dev.platform_data;
	if (!pdata) {
		dev_err(&pdev->dev, "No platform data defined\n");
		return -EINVAL;
	}

	s5p_ehci = kzalloc(sizeof(struct s5p_ehci_hcd), GFP_KERNEL);
	if (!s5p_ehci)
		return -ENOMEM;

	s5p_ehci->dev = &pdev->dev;

	hcd = usb_create_hcd(&s5p_ehci_hc_driver, &pdev->dev,
					dev_name(&pdev->dev));
	if (!hcd) {
		dev_err(&pdev->dev, "Unable to create HCD\n");
		err = -ENOMEM;
		goto fail_hcd;
	}

	s5p_ehci->clk = clk_get(&pdev->dev, "usbhost");

	if (IS_ERR(s5p_ehci->clk)) {
		dev_err(&pdev->dev, "Failed to get usbhost clock\n");
		err = PTR_ERR(s5p_ehci->clk);
		goto fail_clk;
	}

	err = clk_enable(s5p_ehci->clk);
	if (err)
		goto fail_clken;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "Failed to get I/O memory\n");
		err = -ENXIO;
		goto fail_io;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);
	hcd->regs = ioremap(res->start, resource_size(res));
	if (!hcd->regs) {
		dev_err(&pdev->dev, "Failed to remap I/O memory\n");
		err = -ENOMEM;
		goto fail_io;
	}

	irq = platform_get_irq(pdev, 0);
	if (!irq) {
		dev_err(&pdev->dev, "Failed to get IRQ\n");
		err = -ENODEV;
		goto fail;
	}

	if (pdata->phy_init)
		pdata->phy_init(pdev, S5P_USB_PHY_HOST);

	ehci = hcd_to_ehci(hcd);
	ehci->caps = hcd->regs;
	ehci->regs = hcd->regs +
		HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));

	dbg_hcs_params(ehci, "reset");
	dbg_hcc_params(ehci, "reset");

	/* cache this readonly data; minimize chip reads */
	ehci->hcs_params = readl(&ehci->caps->hcs_params);

	err = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
	if (err) {
		dev_err(&pdev->dev, "Failed to add USB HCD\n");
		goto fail;
	}

	platform_set_drvdata(pdev, s5p_ehci);

	return 0;

fail:
	iounmap(hcd->regs);
fail_io:
	clk_disable(s5p_ehci->clk);
fail_clken:
	clk_put(s5p_ehci->clk);
fail_clk:
	usb_put_hcd(hcd);
fail_hcd:
	kfree(s5p_ehci);
	return err;
}

static int s5p_ehci_remove(struct platform_device *pdev)
{
	struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
	struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
	struct usb_hcd *hcd = s5p_ehci->hcd;

	usb_remove_hcd(hcd);

	if (pdata && pdata->phy_exit)
		pdata->phy_exit(pdev, S5P_USB_PHY_HOST);

	iounmap(hcd->regs);

	clk_disable(s5p_ehci->clk);
	clk_put(s5p_ehci->clk);

	usb_put_hcd(hcd);
	kfree(s5p_ehci);

	return 0;
}

static void s5p_ehci_shutdown(struct platform_device *pdev)
{
	struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
	struct usb_hcd *hcd = s5p_ehci->hcd;

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

static struct platform_driver s5p_ehci_driver = {
	.probe		= s5p_ehci_probe,
	.remove		= s5p_ehci_remove,
	.shutdown	= s5p_ehci_shutdown,
	.driver = {
		.name	= "s5p-ehci",
		.owner	= THIS_MODULE,
	}
};

MODULE_ALIAS("platform:s5p-ehci");