[deliverable/linux.git] / drivers / usb / host / ohci-at91.c

/*
 * 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_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),
	},
};
Commit	Line	Data
39a269c0 AV	1	/*
	2	* OHCI HCD (Host Controller Driver) for USB.
	3	*
	4	* Copyright (C) 2004 SAN People (Pty) Ltd.
	5	* Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
	6	*
0365ee0a	7	* AT91 Bus Glue
39a269c0 AV	8	*
	9	* Based on fragments of 2.4 driver by Rick Bronson.
	10	* Based on ohci-omap.c
	11	*
	12	* This file is licenced under the GPL.
	13	*/
	14
	15	#include <linux/clk.h>
	16	#include <linux/platform_device.h>
2419730f JCPV	17	#include <linux/of_platform.h>
2419730f JCPV	18	#include <linux/of_gpio.h>
39a269c0	19
a09e64fb	20	#include <mach/hardware.h>
4bde4a4c DB	21	#include <asm/gpio.h>
4bde4a4c DB	22
a09e64fb RK	23	#include <mach/board.h>
a09e64fb RK	24	#include <mach/cpu.h>
39a269c0	25
0365ee0a DB	26	#ifndef CONFIG_ARCH_AT91
0365ee0a DB	27	#error "CONFIG_ARCH_AT91 must be defined."
39a269c0 AV	28	#endif
39a269c0 AV	29
0ee6d1ee NF	30	#define valid_port(index) ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
	31	#define at91_for_each_port(index) \
	32	for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
	33
ed077bb7 AV	34	/* interface and function clocks; sometimes also an AHB clock */
ed077bb7 AV	35	static struct clk iclk, fclk, *hclk;
0365ee0a	36	static int clocked;
39a269c0 AV	37
	38	extern int usb_disabled(void);
	39
	40	/-------------------------------------------------------------------------/
	41
ed077bb7 AV	42	static void at91_start_clock(void)
ed077bb7 AV	43	{
0af4316b	44	clk_enable(hclk);
ed077bb7 AV	45	clk_enable(iclk);
	46	clk_enable(fclk);
	47	clocked = 1;
	48	}
	49
	50	static void at91_stop_clock(void)
	51	{
	52	clk_disable(fclk);
	53	clk_disable(iclk);
0af4316b	54	clk_disable(hclk);
ed077bb7 AV	55	clocked = 0;
	56	}
	57
39a269c0 AV	58	static void at91_start_hc(struct platform_device *pdev)
	59	{
	60	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	61	struct ohci_regs __iomem *regs = hcd->regs;
	62
0365ee0a	63	dev_dbg(&pdev->dev, "start\n");
39a269c0 AV	64
	65	/*
	66	* Start the USB clocks.
	67	*/
ed077bb7	68	at91_start_clock();
39a269c0 AV	69
	70	/*
	71	* The USB host controller must remain in reset.
	72	*/
	73	writel(0, &regs->control);
	74	}
	75
	76	static void at91_stop_hc(struct platform_device *pdev)
	77	{
	78	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	79	struct ohci_regs __iomem *regs = hcd->regs;
	80
0365ee0a	81	dev_dbg(&pdev->dev, "stop\n");
39a269c0 AV	82
	83	/*
	84	* Put the USB host controller into reset.
	85	*/
	86	writel(0, &regs->control);
	87
	88	/*
	89	* Stop the USB clocks.
	90	*/
ed077bb7	91	at91_stop_clock();
39a269c0 AV	92	}
	93
	94
	95	/-------------------------------------------------------------------------/
	96
b548a27b	97	static void __devexit usb_hcd_at91_remove (struct usb_hcd , struct platform_device );
39a269c0 AV	98
	99	/* configure so an HC device and id are always provided */
	100	/* always called with process context; sleeping is OK */
	101
	102
	103	/**
0365ee0a	104	* usb_hcd_at91_probe - initialize AT91-based HCDs
39a269c0 AV	105	* Context: !in_interrupt()
	106	*
	107	* Allocates basic resources for this USB host controller, and
	108	* then invokes the start() method for the HCD associated with it
	109	* through the hotplug entry's driver_data.
39a269c0	110	*/
b548a27b	111	static int __devinit usb_hcd_at91_probe(const struct hc_driver *driver,
0365ee0a	112	struct platform_device *pdev)
39a269c0 AV	113	{
	114	int retval;
	115	struct usb_hcd *hcd = NULL;
	116
	117	if (pdev->num_resources != 2) {
	118	pr_debug("hcd probe: invalid num_resources");
	119	return -ENODEV;
	120	}
	121
0365ee0a DB	122	if ((pdev->resource[0].flags != IORESOURCE_MEM)
0365ee0a DB	123	\|\| (pdev->resource[1].flags != IORESOURCE_IRQ)) {
39a269c0 AV	124	pr_debug("hcd probe: invalid resource type\n");
	125	return -ENODEV;
	126	}
	127
0365ee0a	128	hcd = usb_create_hcd(driver, &pdev->dev, "at91");
39a269c0 AV	129	if (!hcd)
	130	return -ENOMEM;
	131	hcd->rsrc_start = pdev->resource[0].start;
7a82f612	132	hcd->rsrc_len = resource_size(&pdev->resource[0]);
39a269c0 AV	133
	134	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
	135	pr_debug("request_mem_region failed\n");
	136	retval = -EBUSY;
	137	goto err1;
	138	}
	139
	140	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
	141	if (!hcd->regs) {
	142	pr_debug("ioremap failed\n");
	143	retval = -EIO;
	144	goto err2;
	145	}
	146
	147	iclk = clk_get(&pdev->dev, "ohci_clk");
6813463c JCPV	148	if (IS_ERR(iclk)) {
	149	dev_err(&pdev->dev, "failed to get ohci_clk\n");
	150	retval = PTR_ERR(iclk);
	151	goto err3;
	152	}
39a269c0	153	fclk = clk_get(&pdev->dev, "uhpck");
6813463c JCPV	154	if (IS_ERR(fclk)) {
	155	dev_err(&pdev->dev, "failed to get uhpck\n");
	156	retval = PTR_ERR(fclk);
	157	goto err4;
	158	}
0af4316b	159	hclk = clk_get(&pdev->dev, "hclk");
6813463c JCPV	160	if (IS_ERR(hclk)) {
	161	dev_err(&pdev->dev, "failed to get hclk\n");
	162	retval = PTR_ERR(hclk);
	163	goto err5;
	164	}
39a269c0 AV	165
	166	at91_start_hc(pdev);
	167	ohci_hcd_init(hcd_to_ohci(hcd));
	168
2f2cac3c	169	retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
39a269c0 AV	170	if (retval == 0)
	171	return retval;
	172
	173	/* Error handling */
	174	at91_stop_hc(pdev);
	175
0af4316b	176	clk_put(hclk);
6813463c	177	err5:
39a269c0	178	clk_put(fclk);
6813463c	179	err4:
39a269c0 AV	180	clk_put(iclk);
39a269c0 AV	181
6813463c	182	err3:
39a269c0 AV	183	iounmap(hcd->regs);
	184
	185	err2:
	186	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	187
	188	err1:
	189	usb_put_hcd(hcd);
	190	return retval;
	191	}
	192
	193
39a269c0 AV	194	/* may be called with controller, bus, and devices active */
	195
	196	/**
0365ee0a	197	* usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
39a269c0 AV	198	* @dev: USB Host Controller being removed
	199	* Context: !in_interrupt()
	200	*
	201	* Reverses the effect of usb_hcd_at91_probe(), first invoking
	202	* the HCD's stop() method. It is always called from a thread
0365ee0a	203	* context, "rmmod" or something similar.
39a269c0 AV	204	*
39a269c0 AV	205	*/
b548a27b	206	static void __devexit usb_hcd_at91_remove(struct usb_hcd *hcd,
0365ee0a	207	struct platform_device *pdev)
39a269c0 AV	208	{
	209	usb_remove_hcd(hcd);
	210	at91_stop_hc(pdev);
	211	iounmap(hcd->regs);
68ba61b8	212	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
421b4bf5	213	usb_put_hcd(hcd);
39a269c0	214
0af4316b	215	clk_put(hclk);
68ba61b8 DB	216	clk_put(fclk);
68ba61b8 DB	217	clk_put(iclk);
ed077bb7	218	fclk = iclk = hclk = NULL;
39a269c0 AV	219
39a269c0 AV	220	dev_set_drvdata(&pdev->dev, NULL);
39a269c0 AV	221	}
	222
	223	/-------------------------------------------------------------------------/
	224
	225	static int __devinit
07e4e556	226	ohci_at91_reset (struct usb_hcd *hcd)
39a269c0	227	{
0365ee0a	228	struct at91_usbh_data *board = hcd->self.controller->platform_data;
39a269c0 AV	229	struct ohci_hcd *ohci = hcd_to_ohci (hcd);
	230	int ret;
	231
	232	if ((ret = ohci_init(ohci)) < 0)
	233	return ret;
	234
cd22afda	235	ohci->num_ports = board->ports;
07e4e556 NF	236	return 0;
	237	}
	238
	239	static int __devinit
	240	ohci_at91_start (struct usb_hcd *hcd)
	241	{
	242	struct ohci_hcd *ohci = hcd_to_ohci (hcd);
	243	int ret;
0365ee0a	244
39a269c0	245	if ((ret = ohci_run(ohci)) < 0) {
2418d5f9 GKH	246	dev_err(hcd->self.controller, "can't start %s\n",
2418d5f9 GKH	247	hcd->self.bus_name);
39a269c0 AV	248	ohci_stop(hcd);
	249	return ret;
	250	}
39a269c0 AV	251	return 0;
	252	}
	253
aa6e52a3 TP	254	static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
aa6e52a3 TP	255	{
0ee6d1ee	256	if (!valid_port(port))
aa6e52a3 TP	257	return;
aa6e52a3 TP	258
8a7a49d1	259	if (!gpio_is_valid(pdata->vbus_pin[port]))
770f0baa JCPV	260	return;
770f0baa JCPV	261
8134ff55	262	gpio_set_value(pdata->vbus_pin[port],
1e7caf8b	263	pdata->vbus_pin_active_low[port] ^ enable);
aa6e52a3 TP	264	}
	265
	266	static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
	267	{
0ee6d1ee	268	if (!valid_port(port))
aa6e52a3 TP	269	return -EINVAL;
aa6e52a3 TP	270
8a7a49d1	271	if (!gpio_is_valid(pdata->vbus_pin[port]))
770f0baa JCPV	272	return -EINVAL;
770f0baa JCPV	273
8134ff55	274	return gpio_get_value(pdata->vbus_pin[port]) ^
1e7caf8b	275	pdata->vbus_pin_active_low[port];
aa6e52a3 TP	276	}
	277
	278	/*
	279	* Update the status data from the hub with the over-current indicator change.
	280	*/
	281	static int ohci_at91_hub_status_data(struct usb_hcd hcd, char buf)
	282	{
	283	struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
	284	int length = ohci_hub_status_data(hcd, buf);
	285	int port;
	286
0ee6d1ee	287	at91_for_each_port(port) {
aa6e52a3	288	if (pdata->overcurrent_changed[port]) {
0ee6d1ee	289	if (!length)
aa6e52a3 TP	290	length = 1;
	291	buf[0] \|= 1 << (port + 1);
	292	}
	293	}
	294
	295	return length;
	296	}
	297
	298	/*
	299	* Look at the control requests to the root hub and see if we need to override.
	300	*/
	301	static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
	302	u16 wIndex, char *buf, u16 wLength)
	303	{
	304	struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
	305	struct usb_hub_descriptor *desc;
	306	int ret = -EINVAL;
	307	u32 data = (u32 )buf;
	308
	309	dev_dbg(hcd->self.controller,
	310	"ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
	311	hcd, typeReq, wValue, wIndex, buf, wLength);
	312
0ee6d1ee NF	313	wIndex--;
0ee6d1ee NF	314
aa6e52a3 TP	315	switch (typeReq) {
	316	case SetPortFeature:
	317	if (wValue == USB_PORT_FEAT_POWER) {
	318	dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
0ee6d1ee NF	319	if (valid_port(wIndex)) {
	320	ohci_at91_usb_set_power(pdata, wIndex, 1);
	321	ret = 0;
	322	}
	323
aa6e52a3 TP	324	goto out;
	325	}
	326	break;
	327
	328	case ClearPortFeature:
	329	switch (wValue) {
	330	case USB_PORT_FEAT_C_OVER_CURRENT:
	331	dev_dbg(hcd->self.controller,
	332	"ClearPortFeature: C_OVER_CURRENT\n");
	333
0ee6d1ee NF	334	if (valid_port(wIndex)) {
	335	pdata->overcurrent_changed[wIndex] = 0;
	336	pdata->overcurrent_status[wIndex] = 0;
aa6e52a3 TP	337	}
	338
	339	goto out;
	340
	341	case USB_PORT_FEAT_OVER_CURRENT:
	342	dev_dbg(hcd->self.controller,
	343	"ClearPortFeature: OVER_CURRENT\n");
	344
0ee6d1ee NF	345	if (valid_port(wIndex))
0ee6d1ee NF	346	pdata->overcurrent_status[wIndex] = 0;
aa6e52a3 TP	347
	348	goto out;
	349
	350	case USB_PORT_FEAT_POWER:
	351	dev_dbg(hcd->self.controller,
	352	"ClearPortFeature: POWER\n");
	353
0ee6d1ee NF	354	if (valid_port(wIndex)) {
0ee6d1ee NF	355	ohci_at91_usb_set_power(pdata, wIndex, 0);
aa6e52a3 TP	356	return 0;
	357	}
	358	}
	359	break;
	360	}
	361
0ee6d1ee	362	ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength);
aa6e52a3 TP	363	if (ret)
	364	goto out;
	365
	366	switch (typeReq) {
	367	case GetHubDescriptor:
	368
	369	/* update the hub's descriptor */
	370
	371	desc = (struct usb_hub_descriptor *)buf;
	372
	373	dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
	374	desc->wHubCharacteristics);
	375
	376	/* remove the old configurations for power-switching, and
	377	* over-current protection, and insert our new configuration
	378	*/
	379
	380	desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
	381	desc->wHubCharacteristics \|= cpu_to_le16(0x0001);
	382
	383	if (pdata->overcurrent_supported) {
	384	desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
	385	desc->wHubCharacteristics \|= cpu_to_le16(0x0008\|0x0001);
	386	}
	387
	388	dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
	389	desc->wHubCharacteristics);
	390
	391	return ret;
	392
	393	case GetPortStatus:
	394	/* check port status */
	395
	396	dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
	397
0ee6d1ee NF	398	if (valid_port(wIndex)) {
0ee6d1ee NF	399	if (!ohci_at91_usb_get_power(pdata, wIndex))
aa6e52a3	400	*data &= ~cpu_to_le32(RH_PS_PPS);
aa6e52a3	401
0ee6d1ee	402	if (pdata->overcurrent_changed[wIndex])
aa6e52a3	403	*data \|= cpu_to_le32(RH_PS_OCIC);
aa6e52a3	404
0ee6d1ee	405	if (pdata->overcurrent_status[wIndex])
aa6e52a3	406	*data \|= cpu_to_le32(RH_PS_POCI);
aa6e52a3 TP	407	}
	408	}
	409
	410	out:
	411	return ret;
	412	}
	413
39a269c0 AV	414	/-------------------------------------------------------------------------/
	415
	416	static const struct hc_driver ohci_at91_hc_driver = {
	417	.description = hcd_name,
0365ee0a	418	.product_desc = "AT91 OHCI",
39a269c0 AV	419	.hcd_priv_size = sizeof(struct ohci_hcd),
	420
	421	/*
	422	* generic hardware linkage
	423	*/
	424	.irq = ohci_irq,
	425	.flags = HCD_USB11 \| HCD_MEMORY,
	426
	427	/*
	428	* basic lifecycle operations
	429	*/
07e4e556	430	.reset = ohci_at91_reset,
39a269c0 AV	431	.start = ohci_at91_start,
39a269c0 AV	432	.stop = ohci_stop,
dd9048af	433	.shutdown = ohci_shutdown,
39a269c0 AV	434
	435	/*
	436	* managing i/o requests and associated device resources
	437	*/
	438	.urb_enqueue = ohci_urb_enqueue,
	439	.urb_dequeue = ohci_urb_dequeue,
	440	.endpoint_disable = ohci_endpoint_disable,
	441
	442	/*
	443	* scheduling support
	444	*/
	445	.get_frame_number = ohci_get_frame,
	446
	447	/*
	448	* root hub support
	449	*/
aa6e52a3 TP	450	.hub_status_data = ohci_at91_hub_status_data,
aa6e52a3 TP	451	.hub_control = ohci_at91_hub_control,
39a269c0	452	#ifdef CONFIG_PM
68ba61b8 DB	453	.bus_suspend = ohci_bus_suspend,
68ba61b8 DB	454	.bus_resume = ohci_bus_resume,
39a269c0 AV	455	#endif
	456	.start_port_reset = ohci_start_port_reset,
	457	};
	458
	459	/-------------------------------------------------------------------------/
	460
aa6e52a3 TP	461	static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
	462	{
	463	struct platform_device *pdev = data;
	464	struct at91_usbh_data *pdata = pdev->dev.platform_data;
	465	int val, gpio, port;
	466
	467	/* From the GPIO notifying the over-current situation, find
	468	* out the corresponding port */
0ee6d1ee	469	at91_for_each_port(port) {
e4499079 NF	470	if (gpio_to_irq(pdata->overcurrent_pin[port]) == irq) {
e4499079 NF	471	gpio = pdata->overcurrent_pin[port];
aa6e52a3	472	break;
e4499079	473	}
aa6e52a3 TP	474	}
aa6e52a3 TP	475
0ee6d1ee	476	if (port == AT91_MAX_USBH_PORTS) {
aa6e52a3 TP	477	dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
	478	return IRQ_HANDLED;
	479	}
	480
	481	val = gpio_get_value(gpio);
	482
	483	/* When notified of an over-current situation, disable power
	484	on the corresponding port, and mark this port in
	485	over-current. */
0ee6d1ee	486	if (!val) {
aa6e52a3 TP	487	ohci_at91_usb_set_power(pdata, port, 0);
	488	pdata->overcurrent_status[port] = 1;
	489	pdata->overcurrent_changed[port] = 1;
	490	}
	491
	492	dev_dbg(& pdev->dev, "overcurrent situation %s\n",
	493	val ? "exited" : "notified");
	494
	495	return IRQ_HANDLED;
	496	}
	497
2419730f JCPV	498	#ifdef CONFIG_OF
	499	static const struct of_device_id at91_ohci_dt_ids[] = {
	500	{ .compatible = "atmel,at91rm9200-ohci" },
	501	{ /* sentinel */ }
	502	};
	503
	504	MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
	505
	506	static u64 at91_ohci_dma_mask = DMA_BIT_MASK(32);
	507
	508	static int __devinit ohci_at91_of_init(struct platform_device *pdev)
	509	{
	510	struct device_node *np = pdev->dev.of_node;
aaf9f5fc	511	int i, gpio;
2419730f JCPV	512	enum of_gpio_flags flags;
	513	struct at91_usbh_data *pdata;
	514	u32 ports;
	515
	516	if (!np)
	517	return 0;
	518
	519	/* Right now device-tree probed devices don't get dma_mask set.
	520	* Since shared usb code relies on it, set it here for now.
	521	* Once we have dma capability bindings this can go away.
	522	*/
	523	if (!pdev->dev.dma_mask)
	524	pdev->dev.dma_mask = &at91_ohci_dma_mask;
	525
	526	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	527	if (!pdata)
	528	return -ENOMEM;
	529
	530	if (!of_property_read_u32(np, "num-ports", &ports))
	531	pdata->ports = ports;
	532
0ee6d1ee	533	at91_for_each_port(i) {
2419730f JCPV	534	gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i, &flags);
	535	pdata->vbus_pin[i] = gpio;
	536	if (!gpio_is_valid(gpio))
	537	continue;
	538	pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
2419730f JCPV	539	}
2419730f JCPV	540
0ee6d1ee	541	at91_for_each_port(i)
aaf9f5fc NF	542	pdata->overcurrent_pin[i] =
aaf9f5fc NF	543	of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);
2419730f JCPV	544
	545	pdev->dev.platform_data = pdata;
	546
	547	return 0;
	548	}
	549	#else
	550	static int __devinit ohci_at91_of_init(struct platform_device *pdev)
	551	{
	552	return 0;
	553	}
	554	#endif
	555
aa6e52a3 TP	556	/-------------------------------------------------------------------------/
aa6e52a3 TP	557
b548a27b	558	static int __devinit ohci_hcd_at91_drv_probe(struct platform_device *pdev)
39a269c0	559	{
2419730f	560	struct at91_usbh_data *pdata;
4bde4a4c	561	int i;
aaf9f5fc NF	562	int gpio;
aaf9f5fc NF	563	int ret;
4bde4a4c	564
1887ab2b NF	565	ret = ohci_at91_of_init(pdev);
	566	if (ret)
	567	return ret;
2419730f JCPV	568
	569	pdata = pdev->dev.platform_data;
	570
4bde4a4c	571	if (pdata) {
0ee6d1ee	572	at91_for_each_port(i) {
6fffb77c NF	573	/*
	574	* do not configure PIO if not in relation with
	575	* real USB port on board
	576	*/
	577	if (i >= pdata->ports) {
	578	pdata->vbus_pin[i] = -EINVAL;
	579	pdata->overcurrent_pin[i] = -EINVAL;
	580	break;
	581	}
	582
8a7a49d1	583	if (!gpio_is_valid(pdata->vbus_pin[i]))
4bde4a4c	584	continue;
aaf9f5fc NF	585	gpio = pdata->vbus_pin[i];
	586
	587	ret = gpio_request(gpio, "ohci_vbus");
	588	if (ret) {
	589	dev_err(&pdev->dev,
	590	"can't request vbus gpio %d\n", gpio);
	591	continue;
	592	}
	593	ret = gpio_direction_output(gpio,
	594	!pdata->vbus_pin_active_low[i]);
	595	if (ret) {
	596	dev_err(&pdev->dev,
	597	"can't put vbus gpio %d as output %d\n",
	598	gpio, !pdata->vbus_pin_active_low[i]);
	599	gpio_free(gpio);
	600	continue;
	601	}
	602
aa6e52a3 TP	603	ohci_at91_usb_set_power(pdata, i, 1);
	604	}
	605
0ee6d1ee	606	at91_for_each_port(i) {
8a7a49d1	607	if (!gpio_is_valid(pdata->overcurrent_pin[i]))
aa6e52a3	608	continue;
aaf9f5fc NF	609	gpio = pdata->overcurrent_pin[i];
	610
	611	ret = gpio_request(gpio, "ohci_overcurrent");
	612	if (ret) {
	613	dev_err(&pdev->dev,
	614	"can't request overcurrent gpio %d\n",
	615	gpio);
	616	continue;
	617	}
	618
	619	ret = gpio_direction_input(gpio);
	620	if (ret) {
	621	dev_err(&pdev->dev,
	622	"can't configure overcurrent gpio %d as input\n",
	623	gpio);
	624	gpio_free(gpio);
	625	continue;
	626	}
aa6e52a3	627
aaf9f5fc	628	ret = request_irq(gpio_to_irq(gpio),
aa6e52a3 TP	629	ohci_hcd_at91_overcurrent_irq,
	630	IRQF_SHARED, "ohci_overcurrent", pdev);
	631	if (ret) {
aaf9f5fc NF	632	gpio_free(gpio);
	633	dev_err(&pdev->dev,
	634	"can't get gpio IRQ for overcurrent\n");
aa6e52a3	635	}
4bde4a4c DB	636	}
	637	}
	638
0365ee0a DB	639	device_init_wakeup(&pdev->dev, 1);
0365ee0a DB	640	return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
39a269c0 AV	641	}
39a269c0 AV	642
b548a27b	643	static int __devexit ohci_hcd_at91_drv_remove(struct platform_device *pdev)
39a269c0	644	{
4bde4a4c DB	645	struct at91_usbh_data *pdata = pdev->dev.platform_data;
	646	int i;
	647
	648	if (pdata) {
0ee6d1ee	649	at91_for_each_port(i) {
8a7a49d1	650	if (!gpio_is_valid(pdata->vbus_pin[i]))
4bde4a4c	651	continue;
aa6e52a3	652	ohci_at91_usb_set_power(pdata, i, 0);
4bde4a4c DB	653	gpio_free(pdata->vbus_pin[i]);
4bde4a4c DB	654	}
aa6e52a3	655
0ee6d1ee	656	at91_for_each_port(i) {
8a7a49d1	657	if (!gpio_is_valid(pdata->overcurrent_pin[i]))
aa6e52a3 TP	658	continue;
	659	free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev);
	660	gpio_free(pdata->overcurrent_pin[i]);
	661	}
4bde4a4c DB	662	}
4bde4a4c DB	663
0365ee0a	664	device_init_wakeup(&pdev->dev, 0);
421b4bf5 PZ	665	usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
421b4bf5 PZ	666	return 0;
39a269c0 AV	667	}
	668
	669	#ifdef CONFIG_PM
39a269c0	670
68ba61b8	671	static int
0365ee0a	672	ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
68ba61b8	673	{
0365ee0a DB	674	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	675	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
	676
	677	if (device_may_wakeup(&pdev->dev))
	678	enable_irq_wake(hcd->irq);
0365ee0a DB	679
	680	/*
	681	* The integrated transceivers seem unable to notice disconnect,
	682	* reconnect, or wakeup without the 48 MHz clock active. so for
	683	* correctness, always discard connection state (using reset).
	684	*
	685	* REVISIT: some boards will be able to turn VBUS off...
	686	*/
	687	if (at91_suspend_entering_slow_clock()) {
	688	ohci_usb_reset (ohci);
869aa98c PV	689	/* flush the writes */
869aa98c PV	690	(void) ohci_readl (ohci, &ohci->regs->control);
ed077bb7	691	at91_stop_clock();
0365ee0a	692	}
39a269c0 AV	693
	694	return 0;
	695	}
	696
0365ee0a	697	static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
39a269c0	698	{
6dde896e MP	699	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	700
	701	if (device_may_wakeup(&pdev->dev))
	702	disable_irq_wake(hcd->irq);
	703
ed077bb7 AV	704	if (!clocked)
ed077bb7 AV	705	at91_start_clock();
39a269c0	706
43bbb7e0	707	ohci_finish_controller_resume(hcd);
39a269c0 AV	708	return 0;
	709	}
	710	#else
	711	#define ohci_hcd_at91_drv_suspend NULL
	712	#define ohci_hcd_at91_drv_resume NULL
	713	#endif
	714
f4fce61d	715	MODULE_ALIAS("platform:at91_ohci");
68ba61b8	716
39a269c0 AV	717	static struct platform_driver ohci_hcd_at91_driver = {
39a269c0 AV	718	.probe = ohci_hcd_at91_drv_probe,
b548a27b	719	.remove = __devexit_p(ohci_hcd_at91_drv_remove),
64a21d02	720	.shutdown = usb_hcd_platform_shutdown,
39a269c0 AV	721	.suspend = ohci_hcd_at91_drv_suspend,
	722	.resume = ohci_hcd_at91_drv_resume,
	723	.driver = {
0365ee0a	724	.name = "at91_ohci",
39a269c0	725	.owner = THIS_MODULE,
2419730f	726	.of_match_table = of_match_ptr(at91_ohci_dt_ids),
39a269c0 AV	727	},
39a269c0 AV	728	};