Commit 39a269c0 authored by Andrew Victor's avatar Andrew Victor Committed by Greg Kroah-Hartman
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[PATCH] USB: add support for OCHI on AT91rm9200 



This adds support for OHCI on AT91rm9200 based boards.

Possibly of interest here is the way this uses <linux/clk.h> to
gate clocks on/off during system pm state transitions.  That's
typical for non-PCI systems.  Some can go further; Mini-A host
side connectors enable ID-pin sensing.

From: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent d0852299

drivers/usb/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ config USB_ARCH_HAS_OHCI 
	default y if ARCH_LH7A404

	default y if ARCH_S3C2410

	default y if PXA27x

	default y if ARCH_AT91RM9200

	# PPC:

	default y if STB03xxx

	default y if PPC_MPC52xx

drivers/usb/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ obj-$(CONFIG_USB_OHCI_HCD) += host/ 
obj-$(CONFIG_USB_UHCI_HCD)	+= host/

obj-$(CONFIG_USB_SL811_HCD)	+= host/

obj-$(CONFIG_ETRAX_USB_HOST)	+= host/

obj-$(CONFIG_USB_OHCI_AT91)	+= host/



obj-$(CONFIG_USB_ACM)		+= class/

obj-$(CONFIG_USB_PRINTER)	+= class/

drivers/usb/host/ohci-at91.c

0 → 100644
+306 −0
Original line number Diff line number Diff line 
/*

 * OHCI HCD (Host Controller Driver) for USB.

 *

 *  Copyright (C) 2004 SAN People (Pty) Ltd.

 *  Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>

 *

 * AT91RM9200 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_AT91RM9200

#error "This file is AT91RM9200 bus glue.  CONFIG_ARCH_AT91RM9200 must be defined."

#endif



/* interface and function clocks */

static struct clk *iclk, *fclk;



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, "starting AT91RM9200 OHCI USB Controller\n");



	/*

	 * Start the USB clocks.

	 */

	clk_enable(iclk);

	clk_enable(fclk);



	/*

	 * 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, "stopping AT91RM9200 OHCI USB Controller\n");



	/*

	 * Put the USB host controller into reset.

	 */

	writel(0, &regs->control);



	/*

	 * Stop the USB clocks.

	 */

	clk_disable(fclk);

	clk_disable(iclk);

}





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



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 AT91RM9200-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.

 *

 * Store this function in the HCD's struct pci_driver as probe().

 */

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, "at91rm9200");

	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, SA_INTERRUPT);

	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 without controller electrically present */

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



/**

 * usb_hcd_at91_remove - shutdown processing for AT91RM9200-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, normally "rmmod", "apmd", 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);



 	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_ohci_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;



	if ((ret = ohci_run(ohci)) < 0) {

		err("can't start %s", hcd->self.bus_name);

		ohci_stop(hcd);

		return ret;

	}

//	hcd->self.root_hub->maxchild = board->ports;

	return 0;

}



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



static const struct hc_driver ohci_at91_hc_driver = {

	.description =		hcd_name,

	.product_desc =		"AT91RM9200 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,



	/*

	 * 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

	.hub_suspend =		ohci_hub_suspend,

	.hub_resume =		ohci_hub_resume,

#endif

	.start_port_reset =	ohci_start_port_reset,

};



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



static int ohci_hcd_at91_drv_probe(struct platform_device *dev)

{

	return usb_hcd_at91_probe(&ohci_at91_hc_driver, dev);

}



static int ohci_hcd_at91_drv_remove(struct platform_device *dev)

{

	return usb_hcd_at91_remove(platform_get_drvdata(dev), dev);

}



#ifdef CONFIG_PM

static int ohci_hcd_at91_drv_suspend(struct platform_device *dev, u32 state, u32 level)

{

	printk("%s(%s:%d): not implemented yet\n",

		__func__, __FILE__, __LINE__);



	clk_disable(fclk);



	return 0;

}



static int ohci_hcd_at91_drv_resume(struct platform_device *dev, u32 state)

{

	printk("%s(%s:%d): not implemented yet\n",

		__func__, __FILE__, __LINE__);



	clk_enable(fclk);



	return 0;

}

#else

#define ohci_hcd_at91_drv_suspend NULL

#define ohci_hcd_at91_drv_resume  NULL

#endif



static struct platform_driver ohci_hcd_at91_driver = {

	.probe		= ohci_hcd_at91_drv_probe,

	.remove		= ohci_hcd_at91_drv_remove,

	.suspend	= ohci_hcd_at91_drv_suspend,

	.resume		= ohci_hcd_at91_drv_resume,

	.driver		= {

		.name	= "at91rm9200-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);

drivers/usb/host/ohci-hcd.c

+5 −0
Original line number Diff line number Diff line
@@ -905,6 +905,10 @@ MODULE_LICENSE ("GPL"); 
#include "ohci-ppc-soc.c"

#endif



#ifdef CONFIG_ARCH_AT91RM9200

#include "ohci-at91.c"

#endif



#if !(defined(CONFIG_PCI) \

      || defined(CONFIG_SA1111) \

      || defined(CONFIG_ARCH_S3C2410) \
@@ -913,6 +917,7 @@ MODULE_LICENSE ("GPL"); 
      || defined (CONFIG_PXA27x) \

      || defined (CONFIG_SOC_AU1X00) \

      || defined (CONFIG_USB_OHCI_HCD_PPC_SOC) \

      || defined (CONFIG_ARCH_AT91RM9200) \

	)

#error "missing bus glue for ohci-hcd"

#endif

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