Commit 3429e91a authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Sarah Sharp
Browse files

usb: host: xhci: add platform driver support 



This adds a fairly simple xhci-platform driver support. Currently it is
used by the dwc3 driver for supporting host mode.

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
parent fdaf8b31

drivers/usb/host/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -27,6 +27,10 @@ config USB_XHCI_HCD 
	  To compile this driver as a module, choose M here: the

	  module will be called xhci-hcd.



config USB_XHCI_PLATFORM

	tristate

	depends on USB_XHCI_HCD



config USB_XHCI_HCD_DEBUGGING

	bool "Debugging for the xHCI host controller"

	depends on USB_XHCI_HCD

drivers/usb/host/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -15,6 +15,10 @@ xhci-hcd-y := xhci.o xhci-mem.o 
xhci-hcd-y += xhci-ring.o xhci-hub.o xhci-dbg.o

xhci-hcd-$(CONFIG_PCI)	+= xhci-pci.o



ifneq ($(CONFIG_USB_XHCI_PLATFORM), )

	xhci-hcd-y		+= xhci-plat.o

endif



obj-$(CONFIG_USB_WHCI_HCD)	+= whci/



obj-$(CONFIG_PCI)		+= pci-quirks.o

drivers/usb/host/xhci-plat.c

0 → 100644
+205 −0
Original line number Diff line number Diff line 
/*

 * xhci-plat.c - xHCI host controller driver platform Bus Glue.

 *

 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com

 * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

 *

 * A lot of code borrowed from the Linux xHCI driver.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * version 2 as published by the Free Software Foundation.

 */



#include <linux/platform_device.h>

#include <linux/module.h>

#include <linux/slab.h>



#include "xhci.h"



static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)

{

	/*

	 * As of now platform drivers don't provide MSI support so we ensure

	 * here that the generic code does not try to make a pci_dev from our

	 * dev struct in order to setup MSI

	 */

	xhci->quirks |= XHCI_BROKEN_MSI;

}



/* called during probe() after chip reset completes */

static int xhci_plat_setup(struct usb_hcd *hcd)

{

	return xhci_gen_setup(hcd, xhci_plat_quirks);

}



static const struct hc_driver xhci_plat_xhci_driver = {

	.description =		"xhci-hcd",

	.product_desc =		"xHCI Host Controller",

	.hcd_priv_size =	sizeof(struct xhci_hcd *),



	/*

	 * generic hardware linkage

	 */

	.irq =			xhci_irq,

	.flags =		HCD_MEMORY | HCD_USB3 | HCD_SHARED,



	/*

	 * basic lifecycle operations

	 */

	.reset =		xhci_plat_setup,

	.start =		xhci_run,

	.stop =			xhci_stop,

	.shutdown =		xhci_shutdown,



	/*

	 * managing i/o requests and associated device resources

	 */

	.urb_enqueue =		xhci_urb_enqueue,

	.urb_dequeue =		xhci_urb_dequeue,

	.alloc_dev =		xhci_alloc_dev,

	.free_dev =		xhci_free_dev,

	.alloc_streams =	xhci_alloc_streams,

	.free_streams =		xhci_free_streams,

	.add_endpoint =		xhci_add_endpoint,

	.drop_endpoint =	xhci_drop_endpoint,

	.endpoint_reset =	xhci_endpoint_reset,

	.check_bandwidth =	xhci_check_bandwidth,

	.reset_bandwidth =	xhci_reset_bandwidth,

	.address_device =	xhci_address_device,

	.update_hub_device =	xhci_update_hub_device,

	.reset_device =		xhci_discover_or_reset_device,



	/*

	 * scheduling support

	 */

	.get_frame_number =	xhci_get_frame,



	/* Root hub support */

	.hub_control =		xhci_hub_control,

	.hub_status_data =	xhci_hub_status_data,

	.bus_suspend =		xhci_bus_suspend,

	.bus_resume =		xhci_bus_resume,

};



static int xhci_plat_probe(struct platform_device *pdev)

{

	const struct hc_driver	*driver;

	struct xhci_hcd		*xhci;

	struct resource         *res;

	struct usb_hcd		*hcd;

	int			ret;

	int			irq;



	if (usb_disabled())

		return -ENODEV;



	driver = &xhci_plat_xhci_driver;



	irq = platform_get_irq(pdev, 0);

	if (irq < 0)

		return -ENODEV;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res)

		return -ENODEV;



	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));

	if (!hcd)

		return -ENOMEM;



	hcd->rsrc_start = res->start;

	hcd->rsrc_len = resource_size(res);



	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,

				driver->description)) {

		dev_dbg(&pdev->dev, "controller already in use\n");

		ret = -EBUSY;

		goto put_hcd;

	}



	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);

	if (!hcd->regs) {

		dev_dbg(&pdev->dev, "error mapping memory\n");

		ret = -EFAULT;

		goto release_mem_region;

	}



	ret = usb_add_hcd(hcd, irq, IRQF_SHARED);

	if (ret)

		goto unmap_registers;



	/* USB 2.0 roothub is stored in the platform_device now. */

	hcd = dev_get_drvdata(&pdev->dev);

	xhci = hcd_to_xhci(hcd);

	xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,

			dev_name(&pdev->dev), hcd);

	if (!xhci->shared_hcd) {

		ret = -ENOMEM;

		goto dealloc_usb2_hcd;

	}



	/*

	 * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset)

	 * is called by usb_add_hcd().

	 */

	*((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;



	ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);

	if (ret)

		goto put_usb3_hcd;



	return 0;



put_usb3_hcd:

	usb_put_hcd(xhci->shared_hcd);



dealloc_usb2_hcd:

	usb_remove_hcd(hcd);



unmap_registers:

	iounmap(hcd->regs);



release_mem_region:

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



put_hcd:

	usb_put_hcd(hcd);



	return ret;

}



static int xhci_plat_remove(struct platform_device *dev)

{

	struct usb_hcd	*hcd = platform_get_drvdata(dev);

	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);



	usb_remove_hcd(xhci->shared_hcd);

	usb_put_hcd(xhci->shared_hcd);



	usb_remove_hcd(hcd);

	iounmap(hcd->regs);

	usb_put_hcd(hcd);

	kfree(xhci);



	return 0;

}



static struct platform_driver usb_xhci_driver = {

	.probe	= xhci_plat_probe,

	.remove	= xhci_plat_remove,

	.driver	= {

		.name = "xhci-hcd",

	},

};

MODULE_ALIAS("platform:xhci-hcd");



int xhci_register_plat(void)

{

	return platform_driver_register(&usb_xhci_driver);

}



void xhci_unregister_plat(void)

{

	platform_driver_unregister(&usb_xhci_driver);

}

drivers/usb/host/xhci.c

+9 −0
Original line number Diff line number Diff line
@@ -4064,6 +4064,11 @@ static int __init xhci_hcd_init(void) 
		printk(KERN_DEBUG "Problem registering PCI driver.");

		return retval;

	}

	retval = xhci_register_plat();

	if (retval < 0) {

		printk(KERN_DEBUG "Problem registering platform driver.");

		goto unreg_pci;

	}

	/*

	 * Check the compiler generated sizes of structures that must be laid

	 * out in specific ways for hardware access.
@@ -4083,11 +4088,15 @@ static int __init xhci_hcd_init(void) 
	BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8);

	BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);

	return 0;

unreg_pci:

	xhci_unregister_pci();

	return retval;

}

module_init(xhci_hcd_init);



static void __exit xhci_hcd_cleanup(void)

{

	xhci_unregister_pci();

	xhci_unregister_plat();

}

module_exit(xhci_hcd_cleanup);

drivers/usb/host/xhci.h

+11 −0
Original line number Diff line number Diff line
@@ -1663,6 +1663,17 @@ static inline int xhci_register_pci(void) { return 0; } 
static inline void xhci_unregister_pci(void) {}

#endif



#if defined(CONFIG_USB_XHCI_PLATFORM) \

	|| defined(CONFIG_USB_XHCI_PLATFORM_MODULE)

int xhci_register_plat(void);

void xhci_unregister_plat(void);

#else

static inline int xhci_register_plat(void)

{ return 0; }

static inline void xhci_unregister_plat(void)

{  }

#endif



/* xHCI host controller glue */

typedef void (*xhci_get_quirks_t)(struct device *, struct xhci_hcd *);

void xhci_quiesce(struct xhci_hcd *xhci);

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