drivers/usb/host/ohci-at91.c - kernel/msm - Gitiles

 /*
  * 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 <asm/mach-types.h>
 #include <asm/hardware.h>
 #include <asm/arch/board.h>

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

 /* interface and function clocks */
 static struct clk *iclk, *fclk;
 static int clocked;

 extern int usb_disabled(void);

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

 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.
 	 */
 	clk_enable(iclk);
 	clk_enable(fclk);
 	clocked = 1;

 	/*
 	 * 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.
 	 */
 	clk_disable(fclk);
 	clk_disable(iclk);
 	clocked = 0;
 }


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

 static int 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 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 = pdev->resource[0].end - pdev->resource[0].start + 1;

 	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");
 	fclk = clk_get(&pdev->dev, "uhpck");

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

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

 	/* Error handling */
 	at91_stop_hc(pdev);

 	clk_put(fclk);
 	clk_put(iclk);

 	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 int 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);
 	disable_irq_wake(hcd->irq);

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

 	dev_set_drvdata(&pdev->dev, NULL);
 	return 0;
 }

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

 static int __devinit
 ohci_at91_start (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;

 	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_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
 	 */
 	.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_hub_status_data,
 	.hub_control =		ohci_hub_control,
 	.hub_irq_enable =	ohci_rhsc_enable,
 #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_at91_drv_probe(struct platform_device *pdev)
 {
 	device_init_wakeup(&pdev->dev, 1);
 	return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
 }

 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
 {
 	device_init_wakeup(&pdev->dev, 0);
 	return usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
 }

 #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);
 	else
 		disable_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);
 		clk_disable(fclk);
 		clk_disable(iclk);
 		clocked = 0;
 	}

 	return 0;
 }

 static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
 {
 	if (!clocked) {
 		clk_enable(iclk);
 		clk_enable(fclk);
 		clocked = 1;
 	}

 	return 0;
 }
 #else
 #define ohci_hcd_at91_drv_suspend NULL
 #define ohci_hcd_at91_drv_resume  NULL
 #endif

 MODULE_ALIAS("at91_ohci");

 static struct platform_driver ohci_hcd_at91_driver = {
 	.probe		= ohci_hcd_at91_drv_probe,
 	.remove		= 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,
 	},
 };

 static int __init ohci_hcd_at91_init (void)
 {
 	if (usb_disabled())
 		return -ENODEV;

 	return platform_driver_register(&ohci_hcd_at91_driver);
 }

 static void __exit ohci_hcd_at91_cleanup (void)
 {
 	platform_driver_unregister(&ohci_hcd_at91_driver);
 }

 module_init (ohci_hcd_at91_init);
 module_exit (ohci_hcd_at91_cleanup);
	/*
	* 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 <asm/mach-types.h>
	#include <asm/hardware.h>
	#include <asm/arch/board.h>

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

	/* interface and function clocks */
	static struct clk iclk, fclk;
	static int clocked;

	extern int usb_disabled(void);

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

	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.
	*/
	clk_enable(iclk);
	clk_enable(fclk);
	clocked = 1;

	/*
	* 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.
	*/
	clk_disable(fclk);
	clk_disable(iclk);
	clocked = 0;
	}


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

	static int 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 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 = pdev->resource[0].end - pdev->resource[0].start + 1;

	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");
	fclk = clk_get(&pdev->dev, "uhpck");

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

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

	/* Error handling */
	at91_stop_hc(pdev);

	clk_put(fclk);
	clk_put(iclk);

	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 int 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);
	disable_irq_wake(hcd->irq);

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

	dev_set_drvdata(&pdev->dev, NULL);
	return 0;
	}

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

	static int __devinit
	ohci_at91_start (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;

	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_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
	*/
	.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_hub_status_data,
	.hub_control = ohci_hub_control,
	.hub_irq_enable = ohci_rhsc_enable,
	#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_at91_drv_probe(struct platform_device *pdev)
	{
	device_init_wakeup(&pdev->dev, 1);
	return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
	}

	static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
	{
	device_init_wakeup(&pdev->dev, 0);
	return usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
	}

	#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);
	else
	disable_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);
	clk_disable(fclk);
	clk_disable(iclk);
	clocked = 0;
	}

	return 0;
	}

	static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
	{
	if (!clocked) {
	clk_enable(iclk);
	clk_enable(fclk);
	clocked = 1;
	}

	return 0;
	}
	#else
	#define ohci_hcd_at91_drv_suspend NULL
	#define ohci_hcd_at91_drv_resume NULL
	#endif

	MODULE_ALIAS("at91_ohci");

	static struct platform_driver ohci_hcd_at91_driver = {
	.probe = ohci_hcd_at91_drv_probe,
	.remove = 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,
	},
	};

	static int __init ohci_hcd_at91_init (void)
	{
	if (usb_disabled())
	return -ENODEV;

	return platform_driver_register(&ohci_hcd_at91_driver);
	}

	static void __exit ohci_hcd_at91_cleanup (void)
	{
	platform_driver_unregister(&ohci_hcd_at91_driver);
	}

	module_init (ohci_hcd_at91_init);
	module_exit (ohci_hcd_at91_cleanup);