/*
 * 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 pxa27x
 *
 * 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
 *
 * This file is licenced under the GPL.
 */

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

/*
 * UHC: USB Host Controller (OHCI-like) register definitions
 */
#define UHCREV		(0x0000) /* UHC HCI Spec Revision */
#define UHCHCON		(0x0004) /* UHC Host Control Register */
#define UHCCOMS		(0x0008) /* UHC Command Status Register */
#define UHCINTS		(0x000C) /* UHC Interrupt Status Register */
#define UHCINTE		(0x0010) /* UHC Interrupt Enable */
#define UHCINTD		(0x0014) /* UHC Interrupt Disable */
#define UHCHCCA		(0x0018) /* UHC Host Controller Comm. Area */
#define UHCPCED		(0x001C) /* UHC Period Current Endpt Descr */
#define UHCCHED		(0x0020) /* UHC Control Head Endpt Descr */
#define UHCCCED		(0x0024) /* UHC Control Current Endpt Descr */
#define UHCBHED		(0x0028) /* UHC Bulk Head Endpt Descr */
#define UHCBCED		(0x002C) /* UHC Bulk Current Endpt Descr */
#define UHCDHEAD	(0x0030) /* UHC Done Head */
#define UHCFMI		(0x0034) /* UHC Frame Interval */
#define UHCFMR		(0x0038) /* UHC Frame Remaining */
#define UHCFMN		(0x003C) /* UHC Frame Number */
#define UHCPERS		(0x0040) /* UHC Periodic Start */
#define UHCLS		(0x0044) /* UHC Low Speed Threshold */

#define UHCRHDA		(0x0048) /* UHC Root Hub Descriptor A */
#define UHCRHDA_NOCP	(1 << 12)	/* No over current protection */
#define UHCRHDA_OCPM	(1 << 11)	/* Over Current Protection Mode */
#define UHCRHDA_POTPGT(x) \
			(((x) & 0xff) << 24) /* Power On To Power Good Time */

#define UHCRHDB		(0x004C) /* UHC Root Hub Descriptor B */
#define UHCRHS		(0x0050) /* UHC Root Hub Status */
#define UHCRHPS1	(0x0054) /* UHC Root Hub Port 1 Status */
#define UHCRHPS2	(0x0058) /* UHC Root Hub Port 2 Status */
#define UHCRHPS3	(0x005C) /* UHC Root Hub Port 3 Status */

#define UHCSTAT		(0x0060) /* UHC Status Register */
#define UHCSTAT_UPS3	(1 << 16)	/* USB Power Sense Port3 */
#define UHCSTAT_SBMAI	(1 << 15)	/* System Bus Master Abort Interrupt*/
#define UHCSTAT_SBTAI	(1 << 14)	/* System Bus Target Abort Interrupt*/
#define UHCSTAT_UPRI	(1 << 13)	/* USB Port Resume Interrupt */
#define UHCSTAT_UPS2	(1 << 12)	/* USB Power Sense Port 2 */
#define UHCSTAT_UPS1	(1 << 11)	/* USB Power Sense Port 1 */
#define UHCSTAT_HTA	(1 << 10)	/* HCI Target Abort */
#define UHCSTAT_HBA	(1 << 8)	/* HCI Buffer Active */
#define UHCSTAT_RWUE	(1 << 7)	/* HCI Remote Wake Up Event */

#define UHCHR           (0x0064) /* UHC Reset Register */
#define UHCHR_SSEP3	(1 << 11)	/* Sleep Standby Enable for Port3 */
#define UHCHR_SSEP2	(1 << 10)	/* Sleep Standby Enable for Port2 */
#define UHCHR_SSEP1	(1 << 9)	/* Sleep Standby Enable for Port1 */
#define UHCHR_PCPL	(1 << 7)	/* Power control polarity low */
#define UHCHR_PSPL	(1 << 6)	/* Power sense polarity low */
#define UHCHR_SSE	(1 << 5)	/* Sleep Standby Enable */
#define UHCHR_UIT	(1 << 4)	/* USB Interrupt Test */
#define UHCHR_SSDC	(1 << 3)	/* Simulation Scale Down Clock */
#define UHCHR_CGR	(1 << 2)	/* Clock Generation Reset */
#define UHCHR_FHR	(1 << 1)	/* Force Host Controller Reset */
#define UHCHR_FSBIR	(1 << 0)	/* Force System Bus Iface Reset */

#define UHCHIE          (0x0068) /* UHC Interrupt Enable Register*/
#define UHCHIE_UPS3IE	(1 << 14)	/* Power Sense Port3 IntEn */
#define UHCHIE_UPRIE	(1 << 13)	/* Port Resume IntEn */
#define UHCHIE_UPS2IE	(1 << 12)	/* Power Sense Port2 IntEn */
#define UHCHIE_UPS1IE	(1 << 11)	/* Power Sense Port1 IntEn */
#define UHCHIE_TAIE	(1 << 10)	/* HCI Interface Transfer Abort
					   Interrupt Enable*/
#define UHCHIE_HBAIE	(1 << 8)	/* HCI Buffer Active IntEn */
#define UHCHIE_RWIE	(1 << 7)	/* Remote Wake-up IntEn */

#define UHCHIT          (0x006C) /* UHC Interrupt Test register */

#define PXA_UHC_MAX_PORTNUM    3

struct pxa27x_ohci {
	/* must be 1st member here for hcd_to_ohci() to work */
	struct ohci_hcd ohci;

	struct device	*dev;
	struct clk	*clk;
	void __iomem	*mmio_base;
};

#define to_pxa27x_ohci(hcd)	(struct pxa27x_ohci *)hcd_to_ohci(hcd)

/*
  PMM_NPS_MODE -- PMM Non-power switching mode
      Ports are powered continuously.

  PMM_GLOBAL_MODE -- PMM global switching mode
      All ports are powered at the same time.

  PMM_PERPORT_MODE -- PMM per port switching mode
      Ports are powered individually.
 */
static int pxa27x_ohci_select_pmm(struct pxa27x_ohci *ohci, int mode)
{
	uint32_t uhcrhda = __raw_readl(ohci->mmio_base + UHCRHDA);
	uint32_t uhcrhdb = __raw_readl(ohci->mmio_base + UHCRHDB);

	switch (mode) {
	case PMM_NPS_MODE:
		uhcrhda |= RH_A_NPS;
		break;
	case PMM_GLOBAL_MODE:
		uhcrhda &= ~(RH_A_NPS & RH_A_PSM);
		break;
	case PMM_PERPORT_MODE:
		uhcrhda &= ~(RH_A_NPS);
		uhcrhda |= RH_A_PSM;

		/* Set port power control mask bits, only 3 ports. */
		uhcrhdb |= (0x7<<17);
		break;
	default:
		printk( KERN_ERR
			"Invalid mode %d, set to non-power switch mode.\n",
			mode );

		uhcrhda |= RH_A_NPS;
	}

	__raw_writel(uhcrhda, ohci->mmio_base + UHCRHDA);
	__raw_writel(uhcrhdb, ohci->mmio_base + UHCRHDB);
	return 0;
}

extern int usb_disabled(void);

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

static inline void pxa27x_setup_hc(struct pxa27x_ohci *ohci,
				   struct pxaohci_platform_data *inf)
{
	uint32_t uhchr = __raw_readl(ohci->mmio_base + UHCHR);
	uint32_t uhcrhda = __raw_readl(ohci->mmio_base + UHCRHDA);

	if (inf->flags & ENABLE_PORT1)
		uhchr &= ~UHCHR_SSEP1;

	if (inf->flags & ENABLE_PORT2)
		uhchr &= ~UHCHR_SSEP2;

	if (inf->flags & ENABLE_PORT3)
		uhchr &= ~UHCHR_SSEP3;

	if (inf->flags & POWER_CONTROL_LOW)
		uhchr |= UHCHR_PCPL;

	if (inf->flags & POWER_SENSE_LOW)
		uhchr |= UHCHR_PSPL;

	if (inf->flags & NO_OC_PROTECTION)
		uhcrhda |= UHCRHDA_NOCP;
	else
		uhcrhda &= ~UHCRHDA_NOCP;

	if (inf->flags & OC_MODE_PERPORT)
		uhcrhda |= UHCRHDA_OCPM;
	else
		uhcrhda &= ~UHCRHDA_OCPM;

	if (inf->power_on_delay) {
		uhcrhda &= ~UHCRHDA_POTPGT(0xff);
		uhcrhda |= UHCRHDA_POTPGT(inf->power_on_delay / 2);
	}

	__raw_writel(uhchr, ohci->mmio_base + UHCHR);
	__raw_writel(uhcrhda, ohci->mmio_base + UHCRHDA);
}

static inline void pxa27x_reset_hc(struct pxa27x_ohci *ohci)
{
	uint32_t uhchr = __raw_readl(ohci->mmio_base + UHCHR);

	__raw_writel(uhchr | UHCHR_FHR, ohci->mmio_base + UHCHR);
	udelay(11);
	__raw_writel(uhchr & ~UHCHR_FHR, ohci->mmio_base + UHCHR);
}

#ifdef CONFIG_CPU_PXA27x
extern void pxa27x_clear_otgph(void);
#else
#define pxa27x_clear_otgph()	do {} while (0)
#endif

static int pxa27x_start_hc(struct pxa27x_ohci *ohci, struct device *dev)
{
	int retval = 0;
	struct pxaohci_platform_data *inf;
	uint32_t uhchr;

	inf = dev->platform_data;

	clk_enable(ohci->clk);

	pxa27x_reset_hc(ohci);

	uhchr = __raw_readl(ohci->mmio_base + UHCHR) | UHCHR_FSBIR;
	__raw_writel(uhchr, ohci->mmio_base + UHCHR);

	while (__raw_readl(ohci->mmio_base + UHCHR) & UHCHR_FSBIR)
		cpu_relax();

	pxa27x_setup_hc(ohci, inf);

	if (inf->init)
		retval = inf->init(dev);

	if (retval < 0)
		return retval;

	uhchr = __raw_readl(ohci->mmio_base + UHCHR) & ~UHCHR_SSE;
	__raw_writel(uhchr, ohci->mmio_base + UHCHR);
	__raw_writel(UHCHIE_UPRIE | UHCHIE_RWIE, ohci->mmio_base + UHCHIE);

	/* Clear any OTG Pin Hold */
	pxa27x_clear_otgph();
	return 0;
}

static void pxa27x_stop_hc(struct pxa27x_ohci *ohci, struct device *dev)
{
	struct pxaohci_platform_data *inf;
	uint32_t uhccoms;

	inf = dev->platform_data;

	if (inf->exit)
		inf->exit(dev);

	pxa27x_reset_hc(ohci);

	/* Host Controller Reset */
	uhccoms = __raw_readl(ohci->mmio_base + UHCCOMS) | 0x01;
	__raw_writel(uhccoms, ohci->mmio_base + UHCCOMS);
	udelay(10);

	clk_disable(ohci->clk);
}


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

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


/**
 * usb_hcd_pxa27x_probe - initialize pxa27x-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_pxa27x_probe (const struct hc_driver *driver, struct platform_device *pdev)
{
	int retval, irq;
	struct usb_hcd *hcd;
	struct pxaohci_platform_data *inf;
	struct pxa27x_ohci *ohci;
	struct resource *r;
	struct clk *usb_clk;

	inf = pdev->dev.platform_data;

	if (!inf)
		return -ENODEV;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		pr_err("no resource of IORESOURCE_IRQ");
		return -ENXIO;
	}

	usb_clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(usb_clk))
		return PTR_ERR(usb_clk);

	hcd = usb_create_hcd (driver, &pdev->dev, "pxa27x");
	if (!hcd)
		return -ENOMEM;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!r) {
		pr_err("no resource of IORESOURCE_MEM");
		retval = -ENXIO;
		goto err1;
	}

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

	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;
	}

	/* initialize "struct pxa27x_ohci" */
	ohci = (struct pxa27x_ohci *)hcd_to_ohci(hcd);
	ohci->dev = &pdev->dev;
	ohci->clk = usb_clk;
	ohci->mmio_base = (void __iomem *)hcd->regs;

	if ((retval = pxa27x_start_hc(ohci, &pdev->dev)) < 0) {
		pr_debug("pxa27x_start_hc failed");
		goto err3;
	}

	/* Select Power Management Mode */
	pxa27x_ohci_select_pmm(ohci, inf->port_mode);

	if (inf->power_budget)
		hcd->power_budget = inf->power_budget;

	ohci_hcd_init(hcd_to_ohci(hcd));

	retval = usb_add_hcd(hcd, irq, IRQF_DISABLED);
	if (retval == 0)
		return retval;

	pxa27x_stop_hc(ohci, &pdev->dev);
 err3:
	iounmap(hcd->regs);
 err2:
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 err1:
	usb_put_hcd(hcd);
	clk_put(usb_clk);
	return retval;
}


/* may be called without controller electrically present */
/* may be called with controller, bus, and devices active */

/**
 * usb_hcd_pxa27x_remove - shutdown processing for pxa27x-based HCDs
 * @dev: USB Host Controller being removed
 * Context: !in_interrupt()
 *
 * Reverses the effect of usb_hcd_pxa27x_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_pxa27x_remove (struct usb_hcd *hcd, struct platform_device *pdev)
{
	struct pxa27x_ohci *ohci = to_pxa27x_ohci(hcd);

	usb_remove_hcd(hcd);
	pxa27x_stop_hc(ohci, &pdev->dev);
	iounmap(hcd->regs);
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);
	clk_put(ohci->clk);
}

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

static int __devinit
ohci_pxa27x_start (struct usb_hcd *hcd)
{
	struct ohci_hcd	*ohci = hcd_to_ohci (hcd);
	int		ret;

	ohci_dbg (ohci, "ohci_pxa27x_start, ohci:%p", ohci);

	/* The value of NDP in roothub_a is incorrect on this hardware */
	ohci->num_ports = 3;

	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_pxa27x_hc_driver = {
	.description =		hcd_name,
	.product_desc =		"PXA27x OHCI",
	.hcd_priv_size =	sizeof(struct pxa27x_ohci),

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

	/*
	 * basic lifecycle operations
	 */
	.start =		ohci_pxa27x_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_pxa27x_drv_probe(struct platform_device *pdev)
{
	pr_debug ("In ohci_hcd_pxa27x_drv_probe");

	if (usb_disabled())
		return -ENODEV;

	return usb_hcd_pxa27x_probe(&ohci_pxa27x_hc_driver, pdev);
}

static int ohci_hcd_pxa27x_drv_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	usb_hcd_pxa27x_remove(hcd, pdev);
	platform_set_drvdata(pdev, NULL);
	return 0;
}

#ifdef CONFIG_PM
static int ohci_hcd_pxa27x_drv_suspend(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct pxa27x_ohci *ohci = to_pxa27x_ohci(hcd);

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

	pxa27x_stop_hc(ohci, dev);
	hcd->state = HC_STATE_SUSPENDED;

	return 0;
}

static int ohci_hcd_pxa27x_drv_resume(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct pxa27x_ohci *ohci = to_pxa27x_ohci(hcd);
	struct pxaohci_platform_data *inf = dev->platform_data;
	int status;

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

	if ((status = pxa27x_start_hc(ohci, dev)) < 0)
		return status;

	/* Select Power Management Mode */
	pxa27x_ohci_select_pmm(ohci, inf->port_mode);

	ohci_finish_controller_resume(hcd);
	return 0;
}

static struct dev_pm_ops ohci_hcd_pxa27x_pm_ops = {
	.suspend	= ohci_hcd_pxa27x_drv_suspend,
	.resume		= ohci_hcd_pxa27x_drv_resume,
};
#endif

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:pxa27x-ohci");

static struct platform_driver ohci_hcd_pxa27x_driver = {
	.probe		= ohci_hcd_pxa27x_drv_probe,
	.remove		= ohci_hcd_pxa27x_drv_remove,
	.shutdown	= usb_hcd_platform_shutdown,
	.driver		= {
		.name	= "pxa27x-ohci",
		.owner	= THIS_MODULE,
#ifdef CONFIG_PM
		.pm	= &ohci_hcd_pxa27x_pm_ops,
#endif
	},
};