drivers/usb/host/ohci-at91.c - pub/scm/linux/kernel/git/dhowells/security-keys - Git at Google

 /*
  * OHCI HCD (Host Controller Driver) for USB.
  *
  *  Copyright (C) 2004 SAN People (Pty) Ltd.
  *  Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
  *
  * AT91 Bus Glue
  *
  * Based on fragments of 2.4 driver by Rick Bronson.
  * Based on ohci-omap.c
  *
  * This file is licenced under the GPL.
  */

 #include <linux/clk.h>
 #include <linux/platform_device.h>
 #include <linux/of_platform.h>
 #include <linux/of_gpio.h>

 #include <mach/hardware.h>
 #include <asm/gpio.h>

 #include <mach/board.h>
 #include <mach/cpu.h>

 #ifndef CONFIG_ARCH_AT91
 #error "CONFIG_ARCH_AT91 must be defined."
 #endif

 #define valid_port(index)	((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
 #define at91_for_each_port(index)	\
 		for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)

 /* interface and function clocks; sometimes also an AHB clock */
 static struct clk *iclk, *fclk, *hclk;
 static int clocked;

 extern int usb_disabled(void);

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

 static void at91_start_clock(void)
 {
 	clk_enable(hclk);
 	clk_enable(iclk);
 	clk_enable(fclk);
 	clocked = 1;
 }

 static void at91_stop_clock(void)
 {
 	clk_disable(fclk);
 	clk_disable(iclk);
 	clk_disable(hclk);
 	clocked = 0;
 }

 static void at91_start_hc(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd = platform_get_drvdata(pdev);
 	struct ohci_regs __iomem *regs = hcd->regs;

 	dev_dbg(&pdev->dev, "start\n");

 	/*
 	 * Start the USB clocks.
 	 */
 	at91_start_clock();

 	/*
 	 * The USB host controller must remain in reset.
 	 */
 	writel(0, &regs->control);
 }

 static void at91_stop_hc(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd = platform_get_drvdata(pdev);
 	struct ohci_regs __iomem *regs = hcd->regs;

 	dev_dbg(&pdev->dev, "stop\n");

 	/*
 	 * Put the USB host controller into reset.
 	 */
 	writel(0, &regs->control);

 	/*
 	 * Stop the USB clocks.
 	 */
 	at91_stop_clock();
 }


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

 static void __devexit usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);

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


 /**
  * usb_hcd_at91_probe - initialize AT91-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.
  */
 static int __devinit usb_hcd_at91_probe(const struct hc_driver *driver,
 			struct platform_device *pdev)
 {
 	int retval;
 	struct usb_hcd *hcd = NULL;

 	if (pdev->num_resources != 2) {
 		pr_debug("hcd probe: invalid num_resources");
 		return -ENODEV;
 	}

 	if ((pdev->resource[0].flags != IORESOURCE_MEM)
 			|| (pdev->resource[1].flags != IORESOURCE_IRQ)) {
 		pr_debug("hcd probe: invalid resource type\n");
 		return -ENODEV;
 	}

 	hcd = usb_create_hcd(driver, &pdev->dev, "at91");
 	if (!hcd)
 		return -ENOMEM;
 	hcd->rsrc_start = pdev->resource[0].start;
 	hcd->rsrc_len = resource_size(&pdev->resource[0]);

 	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 		pr_debug("request_mem_region failed\n");
 		retval = -EBUSY;
 		goto err1;
 	}

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

 	iclk = clk_get(&pdev->dev, "ohci_clk");
 	if (IS_ERR(iclk)) {
 		dev_err(&pdev->dev, "failed to get ohci_clk\n");
 		retval = PTR_ERR(iclk);
 		goto err3;
 	}
 	fclk = clk_get(&pdev->dev, "uhpck");
 	if (IS_ERR(fclk)) {
 		dev_err(&pdev->dev, "failed to get uhpck\n");
 		retval = PTR_ERR(fclk);
 		goto err4;
 	}
 	hclk = clk_get(&pdev->dev, "hclk");
 	if (IS_ERR(hclk)) {
 		dev_err(&pdev->dev, "failed to get hclk\n");
 		retval = PTR_ERR(hclk);
 		goto err5;
 	}

 	at91_start_hc(pdev);
 	ohci_hcd_init(hcd_to_ohci(hcd));

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

 	/* Error handling */
 	at91_stop_hc(pdev);

 	clk_put(hclk);
  err5:
 	clk_put(fclk);
  err4:
 	clk_put(iclk);

  err3:
 	iounmap(hcd->regs);

  err2:
 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);

  err1:
 	usb_put_hcd(hcd);
 	return retval;
 }


 /* may be called with controller, bus, and devices active */

 /**
  * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
  * @dev: USB Host Controller being removed
  * Context: !in_interrupt()
  *
  * Reverses the effect of usb_hcd_at91_probe(), first invoking
  * the HCD's stop() method.  It is always called from a thread
  * context, "rmmod" or something similar.
  *
  */
 static void __devexit usb_hcd_at91_remove(struct usb_hcd *hcd,
 				struct platform_device *pdev)
 {
 	usb_remove_hcd(hcd);
 	at91_stop_hc(pdev);
 	iounmap(hcd->regs);
 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 	usb_put_hcd(hcd);

 	clk_put(hclk);
 	clk_put(fclk);
 	clk_put(iclk);
 	fclk = iclk = hclk = NULL;

 	dev_set_drvdata(&pdev->dev, NULL);
 }

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

 static int __devinit
 ohci_at91_reset (struct usb_hcd *hcd)
 {
 	struct at91_usbh_data	*board = hcd->self.controller->platform_data;
 	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);
 	int			ret;

 	if ((ret = ohci_init(ohci)) < 0)
 		return ret;

 	ohci->num_ports = board->ports;
 	return 0;
 }

 static int __devinit
 ohci_at91_start (struct usb_hcd *hcd)
 {
 	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);
 	int			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 void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
 {
 	if (!valid_port(port))
 		return;

 	if (!gpio_is_valid(pdata->vbus_pin[port]))
 		return;

 	gpio_set_value(pdata->vbus_pin[port],
 		       pdata->vbus_pin_active_low[port] ^ enable);
 }

 static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
 {
 	if (!valid_port(port))
 		return -EINVAL;

 	if (!gpio_is_valid(pdata->vbus_pin[port]))
 		return -EINVAL;

 	return gpio_get_value(pdata->vbus_pin[port]) ^
 		pdata->vbus_pin_active_low[port];
 }

 /*
  * Update the status data from the hub with the over-current indicator change.
  */
 static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
 {
 	struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
 	int length = ohci_hub_status_data(hcd, buf);
 	int port;

 	at91_for_each_port(port) {
 		if (pdata->overcurrent_changed[port]) {
 			if (!length)
 				length = 1;
 			buf[0] |= 1 << (port + 1);
 		}
 	}

 	return length;
 }

 /*
  * Look at the control requests to the root hub and see if we need to override.
  */
 static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 				 u16 wIndex, char *buf, u16 wLength)
 {
 	struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
 	struct usb_hub_descriptor *desc;
 	int ret = -EINVAL;
 	u32 *data = (u32 *)buf;

 	dev_dbg(hcd->self.controller,
 		"ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
 		hcd, typeReq, wValue, wIndex, buf, wLength);

 	wIndex--;

 	switch (typeReq) {
 	case SetPortFeature:
 		if (wValue == USB_PORT_FEAT_POWER) {
 			dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
 			if (valid_port(wIndex)) {
 				ohci_at91_usb_set_power(pdata, wIndex, 1);
 				ret = 0;
 			}

 			goto out;
 		}
 		break;

 	case ClearPortFeature:
 		switch (wValue) {
 		case USB_PORT_FEAT_C_OVER_CURRENT:
 			dev_dbg(hcd->self.controller,
 				"ClearPortFeature: C_OVER_CURRENT\n");

 			if (valid_port(wIndex)) {
 				pdata->overcurrent_changed[wIndex] = 0;
 				pdata->overcurrent_status[wIndex] = 0;
 			}

 			goto out;

 		case USB_PORT_FEAT_OVER_CURRENT:
 			dev_dbg(hcd->self.controller,
 				"ClearPortFeature: OVER_CURRENT\n");

 			if (valid_port(wIndex))
 				pdata->overcurrent_status[wIndex] = 0;

 			goto out;

 		case USB_PORT_FEAT_POWER:
 			dev_dbg(hcd->self.controller,
 				"ClearPortFeature: POWER\n");

 			if (valid_port(wIndex)) {
 				ohci_at91_usb_set_power(pdata, wIndex, 0);
 				return 0;
 			}
 		}
 		break;
 	}

 	ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength);
 	if (ret)
 		goto out;

 	switch (typeReq) {
 	case GetHubDescriptor:

 		/* update the hub's descriptor */

 		desc = (struct usb_hub_descriptor *)buf;

 		dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
 			desc->wHubCharacteristics);

 		/* remove the old configurations for power-switching, and
 		 * over-current protection, and insert our new configuration
 		 */

 		desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
 		desc->wHubCharacteristics |= cpu_to_le16(0x0001);

 		if (pdata->overcurrent_supported) {
 			desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
 			desc->wHubCharacteristics |=  cpu_to_le16(0x0008|0x0001);
 		}

 		dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
 			desc->wHubCharacteristics);

 		return ret;

 	case GetPortStatus:
 		/* check port status */

 		dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);

 		if (valid_port(wIndex)) {
 			if (!ohci_at91_usb_get_power(pdata, wIndex))
 				*data &= ~cpu_to_le32(RH_PS_PPS);

 			if (pdata->overcurrent_changed[wIndex])
 				*data |= cpu_to_le32(RH_PS_OCIC);

 			if (pdata->overcurrent_status[wIndex])
 				*data |= cpu_to_le32(RH_PS_POCI);
 		}
 	}

  out:
 	return ret;
 }

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

 static const struct hc_driver ohci_at91_hc_driver = {
 	.description =		hcd_name,
 	.product_desc =		"AT91 OHCI",
 	.hcd_priv_size =	sizeof(struct ohci_hcd),

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

 	/*
 	 * basic lifecycle operations
 	 */
 	.reset =		ohci_at91_reset,
 	.start =		ohci_at91_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_at91_hub_status_data,
 	.hub_control =		ohci_at91_hub_control,
 #ifdef CONFIG_PM
 	.bus_suspend =		ohci_bus_suspend,
 	.bus_resume =		ohci_bus_resume,
 #endif
 	.start_port_reset =	ohci_start_port_reset,
 };

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

 static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
 {
 	struct platform_device *pdev = data;
 	struct at91_usbh_data *pdata = pdev->dev.platform_data;
 	int val, gpio, port;

 	/* From the GPIO notifying the over-current situation, find
 	 * out the corresponding port */
 	at91_for_each_port(port) {
 		if (gpio_is_valid(pdata->overcurrent_pin[port]) &&
 				gpio_to_irq(pdata->overcurrent_pin[port]) == irq) {
 			gpio = pdata->overcurrent_pin[port];
 			break;
 		}
 	}

 	if (port == AT91_MAX_USBH_PORTS) {
 		dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
 		return IRQ_HANDLED;
 	}

 	val = gpio_get_value(gpio);

 	/* When notified of an over-current situation, disable power
 	   on the corresponding port, and mark this port in
 	   over-current. */
 	if (!val) {
 		ohci_at91_usb_set_power(pdata, port, 0);
 		pdata->overcurrent_status[port]  = 1;
 		pdata->overcurrent_changed[port] = 1;
 	}

 	dev_dbg(& pdev->dev, "overcurrent situation %s\n",
 		val ? "exited" : "notified");

 	return IRQ_HANDLED;
 }

 #ifdef CONFIG_OF
 static const struct of_device_id at91_ohci_dt_ids[] = {
 	{ .compatible = "atmel,at91rm9200-ohci" },
 	{ /* sentinel */ }
 };

 MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);

 static u64 at91_ohci_dma_mask = DMA_BIT_MASK(32);

 static int __devinit ohci_at91_of_init(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	int i, gpio;
 	enum of_gpio_flags flags;
 	struct at91_usbh_data	*pdata;
 	u32 ports;

 	if (!np)
 		return 0;

 	/* Right now device-tree probed devices don't get dma_mask set.
 	 * Since shared usb code relies on it, set it here for now.
 	 * Once we have dma capability bindings this can go away.
 	 */
 	if (!pdev->dev.dma_mask)
 		pdev->dev.dma_mask = &at91_ohci_dma_mask;

 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return -ENOMEM;

 	if (!of_property_read_u32(np, "num-ports", &ports))
 		pdata->ports = ports;

 	at91_for_each_port(i) {
 		gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags);
 		pdata->vbus_pin[i] = gpio;
 		if (!gpio_is_valid(gpio))
 			continue;
 		pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
 	}

 	at91_for_each_port(i)
 		pdata->overcurrent_pin[i] =
 			of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);

 	pdev->dev.platform_data = pdata;

 	return 0;
 }
 #else
 static int __devinit ohci_at91_of_init(struct platform_device *pdev)
 {
 	return 0;
 }
 #endif

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

 static int __devinit ohci_hcd_at91_drv_probe(struct platform_device *pdev)
 {
 	struct at91_usbh_data	*pdata;
 	int			i;
 	int			gpio;
 	int			ret;

 	ret = ohci_at91_of_init(pdev);
 	if (ret)
 		return ret;

 	pdata = pdev->dev.platform_data;

 	if (pdata) {
 		at91_for_each_port(i) {
 			/*
 			 * do not configure PIO if not in relation with
 			 * real USB port on board
 			 */
 			if (i >= pdata->ports) {
 				pdata->vbus_pin[i] = -EINVAL;
 				pdata->overcurrent_pin[i] = -EINVAL;
 				break;
 			}

 			if (!gpio_is_valid(pdata->vbus_pin[i]))
 				continue;
 			gpio = pdata->vbus_pin[i];

 			ret = gpio_request(gpio, "ohci_vbus");
 			if (ret) {
 				dev_err(&pdev->dev,
 					"can't request vbus gpio %d\n", gpio);
 				continue;
 			}
 			ret = gpio_direction_output(gpio,
 						!pdata->vbus_pin_active_low[i]);
 			if (ret) {
 				dev_err(&pdev->dev,
 					"can't put vbus gpio %d as output %d\n",
 					gpio, !pdata->vbus_pin_active_low[i]);
 				gpio_free(gpio);
 				continue;
 			}

 			ohci_at91_usb_set_power(pdata, i, 1);
 		}

 		at91_for_each_port(i) {
 			if (!gpio_is_valid(pdata->overcurrent_pin[i]))
 				continue;
 			gpio = pdata->overcurrent_pin[i];

 			ret = gpio_request(gpio, "ohci_overcurrent");
 			if (ret) {
 				dev_err(&pdev->dev,
 					"can't request overcurrent gpio %d\n",
 					gpio);
 				continue;
 			}

 			ret = gpio_direction_input(gpio);
 			if (ret) {
 				dev_err(&pdev->dev,
 					"can't configure overcurrent gpio %d as input\n",
 					gpio);
 				gpio_free(gpio);
 				continue;
 			}

 			ret = request_irq(gpio_to_irq(gpio),
 					  ohci_hcd_at91_overcurrent_irq,
 					  IRQF_SHARED, "ohci_overcurrent", pdev);
 			if (ret) {
 				gpio_free(gpio);
 				dev_err(&pdev->dev,
 					"can't get gpio IRQ for overcurrent\n");
 			}
 		}
 	}

 	device_init_wakeup(&pdev->dev, 1);
 	return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
 }

 static int __devexit ohci_hcd_at91_drv_remove(struct platform_device *pdev)
 {
 	struct at91_usbh_data	*pdata = pdev->dev.platform_data;
 	int			i;

 	if (pdata) {
 		at91_for_each_port(i) {
 			if (!gpio_is_valid(pdata->vbus_pin[i]))
 				continue;
 			ohci_at91_usb_set_power(pdata, i, 0);
 			gpio_free(pdata->vbus_pin[i]);
 		}

 		at91_for_each_port(i) {
 			if (!gpio_is_valid(pdata->overcurrent_pin[i]))
 				continue;
 			free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev);
 			gpio_free(pdata->overcurrent_pin[i]);
 		}
 	}

 	device_init_wakeup(&pdev->dev, 0);
 	usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
 	return 0;
 }

 #ifdef CONFIG_PM

 static int
 ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
 {
 	struct usb_hcd	*hcd = platform_get_drvdata(pdev);
 	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);

 	if (device_may_wakeup(&pdev->dev))
 		enable_irq_wake(hcd->irq);

 	/*
 	 * The integrated transceivers seem unable to notice disconnect,
 	 * reconnect, or wakeup without the 48 MHz clock active.  so for
 	 * correctness, always discard connection state (using reset).
 	 *
 	 * REVISIT: some boards will be able to turn VBUS off...
 	 */
 	if (at91_suspend_entering_slow_clock()) {
 		ohci_usb_reset (ohci);
 		/* flush the writes */
 		(void) ohci_readl (ohci, &ohci->regs->control);
 		at91_stop_clock();
 	}

 	return 0;
 }

 static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
 {
 	struct usb_hcd	*hcd = platform_get_drvdata(pdev);

 	if (device_may_wakeup(&pdev->dev))
 		disable_irq_wake(hcd->irq);

 	if (!clocked)
 		at91_start_clock();

 	ohci_finish_controller_resume(hcd);
 	return 0;
 }
 #else
 #define ohci_hcd_at91_drv_suspend NULL
 #define ohci_hcd_at91_drv_resume  NULL
 #endif

 MODULE_ALIAS("platform:at91_ohci");

 static struct platform_driver ohci_hcd_at91_driver = {
 	.probe		= ohci_hcd_at91_drv_probe,
 	.remove		= __devexit_p(ohci_hcd_at91_drv_remove),
 	.shutdown	= usb_hcd_platform_shutdown,
 	.suspend	= ohci_hcd_at91_drv_suspend,
 	.resume		= ohci_hcd_at91_drv_resume,
 	.driver		= {
 		.name	= "at91_ohci",
 		.owner	= THIS_MODULE,
 		.of_match_table	= of_match_ptr(at91_ohci_dt_ids),
 	},
 };
	/*
	* OHCI HCD (Host Controller Driver) for USB.
	*
	* Copyright (C) 2004 SAN People (Pty) Ltd.
	* Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
	*
	* AT91 Bus Glue
	*
	* Based on fragments of 2.4 driver by Rick Bronson.
	* Based on ohci-omap.c
	*
	* This file is licenced under the GPL.
	*/

	#include <linux/clk.h>
	#include <linux/platform_device.h>
	#include <linux/of_platform.h>
	#include <linux/of_gpio.h>

	#include <mach/hardware.h>
	#include <asm/gpio.h>

	#include <mach/board.h>
	#include <mach/cpu.h>

	#ifndef CONFIG_ARCH_AT91
	#error "CONFIG_ARCH_AT91 must be defined."
	#endif

	#define valid_port(index) ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
	#define at91_for_each_port(index) \
	for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)

	/* interface and function clocks; sometimes also an AHB clock */
	static struct clk iclk, fclk, *hclk;
	static int clocked;

	extern int usb_disabled(void);

	/-------------------------------------------------------------------------/

	static void at91_start_clock(void)
	{
	clk_enable(hclk);
	clk_enable(iclk);
	clk_enable(fclk);
	clocked = 1;
	}

	static void at91_stop_clock(void)
	{
	clk_disable(fclk);
	clk_disable(iclk);
	clk_disable(hclk);
	clocked = 0;
	}

	static void at91_start_hc(struct platform_device *pdev)
	{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct ohci_regs __iomem *regs = hcd->regs;

	dev_dbg(&pdev->dev, "start\n");

	/*
	* Start the USB clocks.
	*/
	at91_start_clock();

	/*
	* The USB host controller must remain in reset.
	*/
	writel(0, &regs->control);
	}

	static void at91_stop_hc(struct platform_device *pdev)
	{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct ohci_regs __iomem *regs = hcd->regs;

	dev_dbg(&pdev->dev, "stop\n");

	/*
	* Put the USB host controller into reset.
	*/
	writel(0, &regs->control);

	/*
	* Stop the USB clocks.
	*/
	at91_stop_clock();
	}


	/-------------------------------------------------------------------------/

	static void __devexit usb_hcd_at91_remove (struct usb_hcd , struct platform_device );

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


	/**
	* usb_hcd_at91_probe - initialize AT91-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.
	*/
	static int __devinit usb_hcd_at91_probe(const struct hc_driver *driver,
	struct platform_device *pdev)
	{
	int retval;
	struct usb_hcd *hcd = NULL;

	if (pdev->num_resources != 2) {
	pr_debug("hcd probe: invalid num_resources");
	return -ENODEV;
	}

	if ((pdev->resource[0].flags != IORESOURCE_MEM)
	\|\| (pdev->resource[1].flags != IORESOURCE_IRQ)) {
	pr_debug("hcd probe: invalid resource type\n");
	return -ENODEV;
	}

	hcd = usb_create_hcd(driver, &pdev->dev, "at91");
	if (!hcd)
	return -ENOMEM;
	hcd->rsrc_start = pdev->resource[0].start;
	hcd->rsrc_len = resource_size(&pdev->resource[0]);

	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
	pr_debug("request_mem_region failed\n");
	retval = -EBUSY;
	goto err1;
	}

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

	iclk = clk_get(&pdev->dev, "ohci_clk");
	if (IS_ERR(iclk)) {
	dev_err(&pdev->dev, "failed to get ohci_clk\n");
	retval = PTR_ERR(iclk);
	goto err3;
	}
	fclk = clk_get(&pdev->dev, "uhpck");
	if (IS_ERR(fclk)) {
	dev_err(&pdev->dev, "failed to get uhpck\n");
	retval = PTR_ERR(fclk);
	goto err4;
	}
	hclk = clk_get(&pdev->dev, "hclk");
	if (IS_ERR(hclk)) {
	dev_err(&pdev->dev, "failed to get hclk\n");
	retval = PTR_ERR(hclk);
	goto err5;
	}

	at91_start_hc(pdev);
	ohci_hcd_init(hcd_to_ohci(hcd));

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

	/* Error handling */
	at91_stop_hc(pdev);

	clk_put(hclk);
	err5:
	clk_put(fclk);
	err4:
	clk_put(iclk);

	err3:
	iounmap(hcd->regs);

	err2:
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);

	err1:
	usb_put_hcd(hcd);
	return retval;
	}


	/* may be called with controller, bus, and devices active */

	/**
	* usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
	* @dev: USB Host Controller being removed
	* Context: !in_interrupt()
	*
	* Reverses the effect of usb_hcd_at91_probe(), first invoking
	* the HCD's stop() method. It is always called from a thread
	* context, "rmmod" or something similar.
	*
	*/
	static void __devexit usb_hcd_at91_remove(struct usb_hcd *hcd,
	struct platform_device *pdev)
	{
	usb_remove_hcd(hcd);
	at91_stop_hc(pdev);
	iounmap(hcd->regs);
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);

	clk_put(hclk);
	clk_put(fclk);
	clk_put(iclk);
	fclk = iclk = hclk = NULL;

	dev_set_drvdata(&pdev->dev, NULL);
	}

	/-------------------------------------------------------------------------/

	static int __devinit
	ohci_at91_reset (struct usb_hcd *hcd)
	{
	struct at91_usbh_data *board = hcd->self.controller->platform_data;
	struct ohci_hcd *ohci = hcd_to_ohci (hcd);
	int ret;

	if ((ret = ohci_init(ohci)) < 0)
	return ret;

	ohci->num_ports = board->ports;
	return 0;
	}

	static int __devinit
	ohci_at91_start (struct usb_hcd *hcd)
	{
	struct ohci_hcd *ohci = hcd_to_ohci (hcd);
	int 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 void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
	{
	if (!valid_port(port))
	return;

	if (!gpio_is_valid(pdata->vbus_pin[port]))
	return;

	gpio_set_value(pdata->vbus_pin[port],
	pdata->vbus_pin_active_low[port] ^ enable);
	}

	static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
	{
	if (!valid_port(port))
	return -EINVAL;

	if (!gpio_is_valid(pdata->vbus_pin[port]))
	return -EINVAL;

	return gpio_get_value(pdata->vbus_pin[port]) ^
	pdata->vbus_pin_active_low[port];
	}

	/*
	* Update the status data from the hub with the over-current indicator change.
	*/
	static int ohci_at91_hub_status_data(struct usb_hcd hcd, char buf)
	{
	struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
	int length = ohci_hub_status_data(hcd, buf);
	int port;

	at91_for_each_port(port) {
	if (pdata->overcurrent_changed[port]) {
	if (!length)
	length = 1;
	buf[0] \|= 1 << (port + 1);
	}
	}

	return length;
	}

	/*
	* Look at the control requests to the root hub and see if we need to override.
	*/
	static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
	u16 wIndex, char *buf, u16 wLength)
	{
	struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
	struct usb_hub_descriptor *desc;
	int ret = -EINVAL;
	u32 data = (u32 )buf;

	dev_dbg(hcd->self.controller,
	"ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
	hcd, typeReq, wValue, wIndex, buf, wLength);

	wIndex--;

	switch (typeReq) {
	case SetPortFeature:
	if (wValue == USB_PORT_FEAT_POWER) {
	dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
	if (valid_port(wIndex)) {
	ohci_at91_usb_set_power(pdata, wIndex, 1);
	ret = 0;
	}

	goto out;
	}
	break;

	case ClearPortFeature:
	switch (wValue) {
	case USB_PORT_FEAT_C_OVER_CURRENT:
	dev_dbg(hcd->self.controller,
	"ClearPortFeature: C_OVER_CURRENT\n");

	if (valid_port(wIndex)) {
	pdata->overcurrent_changed[wIndex] = 0;
	pdata->overcurrent_status[wIndex] = 0;
	}

	goto out;

	case USB_PORT_FEAT_OVER_CURRENT:
	dev_dbg(hcd->self.controller,
	"ClearPortFeature: OVER_CURRENT\n");

	if (valid_port(wIndex))
	pdata->overcurrent_status[wIndex] = 0;

	goto out;

	case USB_PORT_FEAT_POWER:
	dev_dbg(hcd->self.controller,
	"ClearPortFeature: POWER\n");

	if (valid_port(wIndex)) {
	ohci_at91_usb_set_power(pdata, wIndex, 0);
	return 0;
	}
	}
	break;
	}

	ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength);
	if (ret)
	goto out;

	switch (typeReq) {
	case GetHubDescriptor:

	/* update the hub's descriptor */

	desc = (struct usb_hub_descriptor *)buf;

	dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
	desc->wHubCharacteristics);

	/* remove the old configurations for power-switching, and
	* over-current protection, and insert our new configuration
	*/

	desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
	desc->wHubCharacteristics \|= cpu_to_le16(0x0001);

	if (pdata->overcurrent_supported) {
	desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
	desc->wHubCharacteristics \|= cpu_to_le16(0x0008\|0x0001);
	}

	dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
	desc->wHubCharacteristics);

	return ret;

	case GetPortStatus:
	/* check port status */

	dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);

	if (valid_port(wIndex)) {
	if (!ohci_at91_usb_get_power(pdata, wIndex))
	*data &= ~cpu_to_le32(RH_PS_PPS);

	if (pdata->overcurrent_changed[wIndex])
	*data \|= cpu_to_le32(RH_PS_OCIC);

	if (pdata->overcurrent_status[wIndex])
	*data \|= cpu_to_le32(RH_PS_POCI);
	}
	}

	out:
	return ret;
	}

	/-------------------------------------------------------------------------/

	static const struct hc_driver ohci_at91_hc_driver = {
	.description = hcd_name,
	.product_desc = "AT91 OHCI",
	.hcd_priv_size = sizeof(struct ohci_hcd),

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

	/*
	* basic lifecycle operations
	*/
	.reset = ohci_at91_reset,
	.start = ohci_at91_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_at91_hub_status_data,
	.hub_control = ohci_at91_hub_control,
	#ifdef CONFIG_PM
	.bus_suspend = ohci_bus_suspend,
	.bus_resume = ohci_bus_resume,
	#endif
	.start_port_reset = ohci_start_port_reset,
	};

	/-------------------------------------------------------------------------/

	static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
	{
	struct platform_device *pdev = data;
	struct at91_usbh_data *pdata = pdev->dev.platform_data;
	int val, gpio, port;

	/* From the GPIO notifying the over-current situation, find
	* out the corresponding port */
	at91_for_each_port(port) {
	if (gpio_is_valid(pdata->overcurrent_pin[port]) &&
	gpio_to_irq(pdata->overcurrent_pin[port]) == irq) {
	gpio = pdata->overcurrent_pin[port];
	break;
	}
	}

	if (port == AT91_MAX_USBH_PORTS) {
	dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
	return IRQ_HANDLED;
	}

	val = gpio_get_value(gpio);

	/* When notified of an over-current situation, disable power
	on the corresponding port, and mark this port in
	over-current. */
	if (!val) {
	ohci_at91_usb_set_power(pdata, port, 0);
	pdata->overcurrent_status[port] = 1;
	pdata->overcurrent_changed[port] = 1;
	}

	dev_dbg(& pdev->dev, "overcurrent situation %s\n",
	val ? "exited" : "notified");

	return IRQ_HANDLED;
	}

	#ifdef CONFIG_OF
	static const struct of_device_id at91_ohci_dt_ids[] = {
	{ .compatible = "atmel,at91rm9200-ohci" },
	{ /* sentinel */ }
	};

	MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);

	static u64 at91_ohci_dma_mask = DMA_BIT_MASK(32);

	static int __devinit ohci_at91_of_init(struct platform_device *pdev)
	{
	struct device_node *np = pdev->dev.of_node;
	int i, gpio;
	enum of_gpio_flags flags;
	struct at91_usbh_data *pdata;
	u32 ports;

	if (!np)
	return 0;

	/* Right now device-tree probed devices don't get dma_mask set.
	* Since shared usb code relies on it, set it here for now.
	* Once we have dma capability bindings this can go away.
	*/
	if (!pdev->dev.dma_mask)
	pdev->dev.dma_mask = &at91_ohci_dma_mask;

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
	return -ENOMEM;

	if (!of_property_read_u32(np, "num-ports", &ports))
	pdata->ports = ports;

	at91_for_each_port(i) {
	gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags);
	pdata->vbus_pin[i] = gpio;
	if (!gpio_is_valid(gpio))
	continue;
	pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
	}

	at91_for_each_port(i)
	pdata->overcurrent_pin[i] =
	of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);

	pdev->dev.platform_data = pdata;

	return 0;
	}
	#else
	static int __devinit ohci_at91_of_init(struct platform_device *pdev)
	{
	return 0;
	}
	#endif

	/-------------------------------------------------------------------------/

	static int __devinit ohci_hcd_at91_drv_probe(struct platform_device *pdev)
	{
	struct at91_usbh_data *pdata;
	int i;
	int gpio;
	int ret;

	ret = ohci_at91_of_init(pdev);
	if (ret)
	return ret;

	pdata = pdev->dev.platform_data;

	if (pdata) {
	at91_for_each_port(i) {
	/*
	* do not configure PIO if not in relation with
	* real USB port on board
	*/
	if (i >= pdata->ports) {
	pdata->vbus_pin[i] = -EINVAL;
	pdata->overcurrent_pin[i] = -EINVAL;
	break;
	}

	if (!gpio_is_valid(pdata->vbus_pin[i]))
	continue;
	gpio = pdata->vbus_pin[i];

	ret = gpio_request(gpio, "ohci_vbus");
	if (ret) {
	dev_err(&pdev->dev,
	"can't request vbus gpio %d\n", gpio);
	continue;
	}
	ret = gpio_direction_output(gpio,
	!pdata->vbus_pin_active_low[i]);
	if (ret) {
	dev_err(&pdev->dev,
	"can't put vbus gpio %d as output %d\n",
	gpio, !pdata->vbus_pin_active_low[i]);
	gpio_free(gpio);
	continue;
	}

	ohci_at91_usb_set_power(pdata, i, 1);
	}

	at91_for_each_port(i) {
	if (!gpio_is_valid(pdata->overcurrent_pin[i]))
	continue;
	gpio = pdata->overcurrent_pin[i];

	ret = gpio_request(gpio, "ohci_overcurrent");
	if (ret) {
	dev_err(&pdev->dev,
	"can't request overcurrent gpio %d\n",
	gpio);
	continue;
	}

	ret = gpio_direction_input(gpio);
	if (ret) {
	dev_err(&pdev->dev,
	"can't configure overcurrent gpio %d as input\n",
	gpio);
	gpio_free(gpio);
	continue;
	}

	ret = request_irq(gpio_to_irq(gpio),
	ohci_hcd_at91_overcurrent_irq,
	IRQF_SHARED, "ohci_overcurrent", pdev);
	if (ret) {
	gpio_free(gpio);
	dev_err(&pdev->dev,
	"can't get gpio IRQ for overcurrent\n");
	}
	}
	}

	device_init_wakeup(&pdev->dev, 1);
	return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
	}

	static int __devexit ohci_hcd_at91_drv_remove(struct platform_device *pdev)
	{
	struct at91_usbh_data *pdata = pdev->dev.platform_data;
	int i;

	if (pdata) {
	at91_for_each_port(i) {
	if (!gpio_is_valid(pdata->vbus_pin[i]))
	continue;
	ohci_at91_usb_set_power(pdata, i, 0);
	gpio_free(pdata->vbus_pin[i]);
	}

	at91_for_each_port(i) {
	if (!gpio_is_valid(pdata->overcurrent_pin[i]))
	continue;
	free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev);
	gpio_free(pdata->overcurrent_pin[i]);
	}
	}

	device_init_wakeup(&pdev->dev, 0);
	usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
	return 0;
	}

	#ifdef CONFIG_PM

	static int
	ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
	{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct ohci_hcd *ohci = hcd_to_ohci(hcd);

	if (device_may_wakeup(&pdev->dev))
	enable_irq_wake(hcd->irq);

	/*
	* The integrated transceivers seem unable to notice disconnect,
	* reconnect, or wakeup without the 48 MHz clock active. so for
	* correctness, always discard connection state (using reset).
	*
	* REVISIT: some boards will be able to turn VBUS off...
	*/
	if (at91_suspend_entering_slow_clock()) {
	ohci_usb_reset (ohci);
	/* flush the writes */
	(void) ohci_readl (ohci, &ohci->regs->control);
	at91_stop_clock();
	}

	return 0;
	}

	static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
	{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	if (device_may_wakeup(&pdev->dev))
	disable_irq_wake(hcd->irq);

	if (!clocked)
	at91_start_clock();

	ohci_finish_controller_resume(hcd);
	return 0;
	}
	#else
	#define ohci_hcd_at91_drv_suspend NULL
	#define ohci_hcd_at91_drv_resume NULL
	#endif

	MODULE_ALIAS("platform:at91_ohci");

	static struct platform_driver ohci_hcd_at91_driver = {
	.probe = ohci_hcd_at91_drv_probe,
	.remove = __devexit_p(ohci_hcd_at91_drv_remove),
	.shutdown = usb_hcd_platform_shutdown,
	.suspend = ohci_hcd_at91_drv_suspend,
	.resume = ohci_hcd_at91_drv_resume,
	.driver = {
	.name = "at91_ohci",
	.owner = THIS_MODULE,
	.of_match_table = of_match_ptr(at91_ohci_dt_ids),
	},
	};