/*
 *  Bus Glue for Realtek rtl819x built-in EHCI controller.
 *
 *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
 *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
 *
 *  Parts of this file are based on Realtek' 2.6.30 BSP
 *	Copyright (C) 2013 Realtek Semiconductor, Corp.
 *
 *  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/delay.h>

extern int usb_disabled(void);

/**
 * usb_hcd_rtl819x_probe - initialize FSL-based HCDs
 * @drvier: Driver to be used for this HCD
 * @pdev: USB Host Controller being probed
 * Context: !in_interrupt()                                                                                         
 *
 * Allocates basic resources for this USB host controller.
 *
 */
static int ehci_rtl819x_probe(const struct hc_driver *driver,
			     struct usb_hcd **hcd_out,
			     struct platform_device *pdev)
{
	struct usb_hcd *hcd;
	struct resource *res;
	int irq;
	int ret;

    pr_debug("initializing RTL-SOC USB Controller\n"); 

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!res) {
		dev_dbg(&pdev->dev, "no IRQ specified for %s\n",
			dev_name(&pdev->dev));
		return -ENODEV;
	}
	irq = res->start;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_dbg(&pdev->dev, "no base address specified for %s\n",
			dev_name(&pdev->dev));
		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	= res->end - res->start + 1;

	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
		dev_dbg(&pdev->dev, "controller already in use\n");
		ret = -EBUSY;
		goto err_put_hcd;
	}

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

	ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
	if (ret) 
		goto err_iounmap;

	return 0;

 err_iounmap:
	iounmap(hcd->regs);

 err_release_region:
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 err_put_hcd:
	usb_put_hcd(hcd);
	return ret;
}

/**
 * usb_hcd_rtl819x_remove - shutdown processing for FSL-based HCDs
 * @dev: USB Host Controller being removed
 * Context: !in_interrupt()
 *      
 * Reverses the effect of usb_hcd_rtl8652_probe().
 *
 */ 
static void usb_hcd_rtl819x_remove(struct usb_hcd *hcd,
			       struct platform_device *pdev)
{
	usb_remove_hcd(hcd);
	iounmap(hcd->regs);
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);
}

static int synopsys_usb_setup(struct ehci_hcd *ehci)
{
#if 1  //tony: patch for synopsys 
    printk("read synopsys=%x\n",readl (&ehci->regs->command+0x84));
    writel(0x01fd0020,&ehci->regs->command+0x84);
    printk("read synopsys2=%x\n",readl (&ehci->regs->command+0x84));
#endif        
    return 0;
}  

static int ehci_rtl819x_setup(struct usb_hcd *hcd)
{
    struct ehci_hcd *ehci = hcd_to_ehci(hcd);
    int ret;

	ehci->big_endian_desc = 1;
	ehci->big_endian_mmio = 1;
    ehci->caps = hcd->regs;
    ehci->regs = hcd->regs +
            HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
    ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);

    ehci->sbrn = 0x20;                                                                                 
    //ehci->has_synopsys_hc_bug = 1;

    ehci_reset(ehci);

    ret = ehci_init(hcd);
    if (ret)
        return ret;

    ehci_port_power(ehci, 0); 

    return 0;
}

static const struct hc_driver ehci_rtl819x_hc_driver = {
	.description		= hcd_name,
	.product_desc		= "Realtek rtl819x On-Chip EHCI Host Controller",
	.hcd_priv_size		= sizeof(struct ehci_hcd),

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

	.reset				= ehci_rtl819x_setup,
	.start				= ehci_run,
	.stop				= ehci_stop,
	.shutdown			= ehci_shutdown,

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

	.get_frame_number	= ehci_get_frame,

	.hub_status_data	= ehci_hub_status_data,
	.hub_control		= ehci_hub_control,
#ifdef CONFIG_PM
	.hub_suspend		= ehci_hub_suspend,
	.hub_resume			= ehci_hub_resume,
#endif
	.relinquish_port	= ehci_relinquish_port,
	.port_handed_over	= ehci_port_handed_over,

	.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};

static int ehci_rtl819x_driver_probe(struct platform_device *pdev)
{
	struct usb_hcd *hcd = NULL;
	int ret;

	if (usb_disabled())
		return -ENODEV;

	ret = ehci_rtl819x_probe(&ehci_rtl819x_hc_driver, &hcd, pdev);
	//ret = usb_hcd_rtl8652_probe(&ehci_rtl819x_hc_driver, pdev); 

	return ret;
}

static int ehci_rtl819x_driver_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

    usb_hcd_rtl819x_remove(hcd, pdev);
	return 0;
}

MODULE_ALIAS("platform:rtl819x-ehci");

static struct platform_driver ehci_rtl819x_driver = {
	.probe		= ehci_rtl819x_driver_probe,
	.remove		= ehci_rtl819x_driver_remove,
	.driver = {
		.name	= "rtl819x-ehci",
	}
};