drivers/usb/host/xhci-pci.c - kernel/bruno - Git at Google

 /*
  * xHCI host controller driver PCI Bus Glue.
  *
  * Copyright (C) 2008 Intel Corp.
  *
  * Author: Sarah Sharp
  * Some code borrowed from the Linux EHCI 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.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software Foundation,
  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

 #include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/module.h>

 #include "xhci.h"
 #include "xhci-trace.h"

 /* Device for a quirk */
 #define PCI_VENDOR_ID_FRESCO_LOGIC	0x1b73
 #define PCI_DEVICE_ID_FRESCO_LOGIC_PDK	0x1000
 #define PCI_DEVICE_ID_FRESCO_LOGIC_FL1400	0x1400

 #define PCI_VENDOR_ID_ETRON		0x1b6f
 #define PCI_DEVICE_ID_ASROCK_P67	0x7023

 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_XHCI	0x8c31
 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI	0x9c31

 static const char hcd_name[] = "xhci_hcd";

 /* called after powerup, by probe or system-pm "wakeup" */
 static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
 {
 	/*
 	 * TODO: Implement finding debug ports later.
 	 * TODO: see if there are any quirks that need to be added to handle
 	 * new extended capabilities.
 	 */

 	/* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
 	if (!pci_set_mwi(pdev))
 		xhci_dbg(xhci, "MWI active\n");

 	xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
 	return 0;
 }

 static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 {
 	struct pci_dev		*pdev = to_pci_dev(dev);

 	/* Look for vendor-specific quirks */
 	if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
 			(pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK ||
 			 pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_FL1400)) {
 		if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
 				pdev->revision == 0x0) {
 			xhci->quirks |= XHCI_RESET_EP_QUIRK;
 			xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 				"QUIRK: Fresco Logic xHC needs configure"
 				" endpoint cmd after reset endpoint");
 		}
 		if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
 				pdev->revision == 0x4) {
 			xhci->quirks |= XHCI_SLOW_SUSPEND;
 			xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 				"QUIRK: Fresco Logic xHC revision %u"
 				"must be suspended extra slowly",
 				pdev->revision);
 		}
 		/* Fresco Logic confirms: all revisions of this chip do not
 		 * support MSI, even though some of them claim to in their PCI
 		 * capabilities.
 		 */
 		xhci->quirks |= XHCI_BROKEN_MSI;
 		xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 				"QUIRK: Fresco Logic revision %u "
 				"has broken MSI implementation",
 				pdev->revision);
 		xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 	}

 	if (pdev->vendor == PCI_VENDOR_ID_NEC)
 		xhci->quirks |= XHCI_NEC_HOST;

 	if (pdev->vendor == PCI_VENDOR_ID_AMD && xhci->hci_version == 0x96)
 		xhci->quirks |= XHCI_AMD_0x96_HOST;

 	/* AMD PLL quirk */
 	if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info())
 		xhci->quirks |= XHCI_AMD_PLL_FIX;
 	if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
 		xhci->quirks |= XHCI_LPM_SUPPORT;
 		xhci->quirks |= XHCI_INTEL_HOST;
 	}
 	if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 			pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
 		xhci->quirks |= XHCI_EP_LIMIT_QUIRK;
 		xhci->limit_active_eps = 64;
 		xhci->quirks |= XHCI_SW_BW_CHECKING;
 		/*
 		 * PPT desktop boards DH77EB and DH77DF will power back on after
 		 * a few seconds of being shutdown.  The fix for this is to
 		 * switch the ports from xHCI to EHCI on shutdown.  We can't use
 		 * DMI information to find those particular boards (since each
 		 * vendor will change the board name), so we have to key off all
 		 * PPT chipsets.
 		 */
 		xhci->quirks |= XHCI_SPURIOUS_REBOOT;
 		xhci->quirks |= XHCI_AVOID_BEI;
 	}
 	if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
 	    (pdev->device == PCI_DEVICE_ID_INTEL_LYNXPOINT_XHCI ||
 	     pdev->device == PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI)) {
 		/* Workaround for occasional spurious wakeups from S5 (or
 		 * any other sleep) on Haswell machines with LPT and LPT-LP
 		 * with the new Intel BIOS
 		 */
 		/* Limit the quirk to only known vendors, as this triggers
 		 * yet another BIOS bug on some other machines
 		 * https://bugzilla.kernel.org/show_bug.cgi?id=66171
 		 */
 		if (pdev->subsystem_vendor == PCI_VENDOR_ID_HP)
 			xhci->quirks |= XHCI_SPURIOUS_WAKEUP;
 	}
 	if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
 			pdev->device == PCI_DEVICE_ID_ASROCK_P67) {
 		xhci->quirks |= XHCI_RESET_ON_RESUME;
 		xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 				"QUIRK: Resetting on resume");
 		xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 	}
 	if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
 			pdev->device == 0x0015 &&
 			pdev->subsystem_vendor == PCI_VENDOR_ID_SAMSUNG &&
 			pdev->subsystem_device == 0xc0cd)
 		xhci->quirks |= XHCI_RESET_ON_RESUME;
 	if (pdev->vendor == PCI_VENDOR_ID_VIA)
 		xhci->quirks |= XHCI_RESET_ON_RESUME;
 }

 /* called during probe() after chip reset completes */
 static int xhci_pci_setup(struct usb_hcd *hcd)
 {
 	struct xhci_hcd		*xhci;
 	struct pci_dev		*pdev = to_pci_dev(hcd->self.controller);
 	int			retval;

 	retval = xhci_gen_setup(hcd, xhci_pci_quirks);
 	if (retval)
 		return retval;

 	xhci = hcd_to_xhci(hcd);
 	if (!usb_hcd_is_primary_hcd(hcd))
 		return 0;

 	pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
 	xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);

 	/* Find any debug ports */
 	retval = xhci_pci_reinit(xhci, pdev);
 	if (!retval)
 		return retval;

 	kfree(xhci);
 	return retval;
 }

 /*
  * We need to register our own PCI probe function (instead of the USB core's
  * function) in order to create a second roothub under xHCI.
  */
 static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 {
 	int retval;
 	struct xhci_hcd *xhci;
 	struct hc_driver *driver;
 	struct usb_hcd *hcd;

 	driver = (struct hc_driver *)id->driver_data;

 	/* Prevent runtime suspending between USB-2 and USB-3 initialization */
 	pm_runtime_get_noresume(&dev->dev);

 	/* Register the USB 2.0 roothub.
 	 * FIXME: USB core must know to register the USB 2.0 roothub first.
 	 * This is sort of silly, because we could just set the HCD driver flags
 	 * to say USB 2.0, but I'm not sure what the implications would be in
 	 * the other parts of the HCD code.
 	 */
 	retval = usb_hcd_pci_probe(dev, id);

 	if (retval)
 		goto put_runtime_pm;

 	/* USB 2.0 roothub is stored in the PCI device now. */
 	hcd = dev_get_drvdata(&dev->dev);
 	xhci = hcd_to_xhci(hcd);
 	xhci->shared_hcd = usb_create_shared_hcd(driver, &dev->dev,
 				pci_name(dev), hcd);
 	if (!xhci->shared_hcd) {
 		retval = -ENOMEM;
 		goto dealloc_usb2_hcd;
 	}

 	/* Set the xHCI pointer before xhci_pci_setup() (aka hcd_driver.reset)
 	 * is called by usb_add_hcd().
 	 */
 	*((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;

 	retval = usb_add_hcd(xhci->shared_hcd, dev->irq,
 			IRQF_SHARED);
 	if (retval)
 		goto put_usb3_hcd;
 	/* Roothub already marked as USB 3.0 speed */

 	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
 		xhci->shared_hcd->can_do_streams = 1;

 	/* USB-2 and USB-3 roothubs initialized, allow runtime pm suspend */
 	pm_runtime_put_noidle(&dev->dev);

 	return 0;

 put_usb3_hcd:
 	usb_put_hcd(xhci->shared_hcd);
 dealloc_usb2_hcd:
 	usb_hcd_pci_remove(dev);
 put_runtime_pm:
 	pm_runtime_put_noidle(&dev->dev);
 	return retval;
 }

 static void xhci_pci_remove(struct pci_dev *dev)
 {
 	struct xhci_hcd *xhci;

 	xhci = hcd_to_xhci(pci_get_drvdata(dev));
 	if (xhci->shared_hcd) {
 		usb_remove_hcd(xhci->shared_hcd);
 		usb_put_hcd(xhci->shared_hcd);
 	}
 	usb_hcd_pci_remove(dev);

 	/* Workaround for spurious wakeups at shutdown with HSW */
 	if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
 		pci_set_power_state(dev, PCI_D3hot);

 	kfree(xhci);
 }

 #ifdef CONFIG_PM
 static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
 {
 	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
 	struct pci_dev		*pdev = to_pci_dev(hcd->self.controller);

 	/*
 	 * Systems with the TI redriver that loses port status change events
 	 * need to have the registers polled during D3, so avoid D3cold.
 	 */
 	if (xhci_compliance_mode_recovery_timer_quirk_check())
 		pdev->no_d3cold = true;

 	return xhci_suspend(xhci);
 }

 static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
 {
 	struct xhci_hcd		*xhci = hcd_to_xhci(hcd);
 	struct pci_dev		*pdev = to_pci_dev(hcd->self.controller);
 	int			retval = 0;

 	/* The BIOS on systems with the Intel Panther Point chipset may or may
 	 * not support xHCI natively.  That means that during system resume, it
 	 * may switch the ports back to EHCI so that users can use their
 	 * keyboard to select a kernel from GRUB after resume from hibernate.
 	 *
 	 * The BIOS is supposed to remember whether the OS had xHCI ports
 	 * enabled before resume, and switch the ports back to xHCI when the
 	 * BIOS/OS semaphore is written, but we all know we can't trust BIOS
 	 * writers.
 	 *
 	 * Unconditionally switch the ports back to xHCI after a system resume.
 	 * It should not matter whether the EHCI or xHCI controller is
 	 * resumed first. It's enough to do the switchover in xHCI because
 	 * USB core won't notice anything as the hub driver doesn't start
 	 * running again until after all the devices (including both EHCI and
 	 * xHCI host controllers) have been resumed.
 	 */

 	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 		usb_enable_intel_xhci_ports(pdev);

 	retval = xhci_resume(xhci, hibernated);
 	return retval;
 }
 #endif /* CONFIG_PM */

 static const struct hc_driver xhci_pci_hc_driver = {
 	.description =		hcd_name,
 	.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_pci_setup,
 	.start =		xhci_run,
 #ifdef CONFIG_PM
 	.pci_suspend =          xhci_pci_suspend,
 	.pci_resume =           xhci_pci_resume,
 #endif
 	.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,
 	.enable_device =	xhci_enable_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,
 	/*
 	 * call back when device connected and addressed
 	 */
 	.update_device =        xhci_update_device,
 	.set_usb2_hw_lpm =	xhci_set_usb2_hardware_lpm,
 	.enable_usb3_lpm_timeout =	xhci_enable_usb3_lpm_timeout,
 	.disable_usb3_lpm_timeout =	xhci_disable_usb3_lpm_timeout,
 	.find_raw_port_number =	xhci_find_raw_port_number,
 };

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

 /* PCI driver selection metadata; PCI hotplugging uses this */
 static const struct pci_device_id pci_ids[] = { {
 	/* handle any USB 3.0 xHCI controller */
 	PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
 	.driver_data =	(unsigned long) &xhci_pci_hc_driver,
 	},
 	{ /* end: all zeroes */ }
 };
 MODULE_DEVICE_TABLE(pci, pci_ids);

 /* pci driver glue; this is a "new style" PCI driver module */
 static struct pci_driver xhci_pci_driver = {
 	.name =		(char *) hcd_name,
 	.id_table =	pci_ids,

 	.probe =	xhci_pci_probe,
 	.remove =	xhci_pci_remove,
 	/* suspend and resume implemented later */

 	.shutdown = 	usb_hcd_pci_shutdown,
 #ifdef CONFIG_PM
 	.driver = {
 		.pm = &usb_hcd_pci_pm_ops
 	},
 #endif
 };

 int __init xhci_register_pci(void)
 {
 	return pci_register_driver(&xhci_pci_driver);
 }

 void xhci_unregister_pci(void)
 {
 	pci_unregister_driver(&xhci_pci_driver);
 }
	/*
	* xHCI host controller driver PCI Bus Glue.
	*
	* Copyright (C) 2008 Intel Corp.
	*
	* Author: Sarah Sharp
	* Some code borrowed from the Linux EHCI 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.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software Foundation,
	* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*/

	#include <linux/pci.h>
	#include <linux/slab.h>
	#include <linux/module.h>

	#include "xhci.h"
	#include "xhci-trace.h"

	/* Device for a quirk */
	#define PCI_VENDOR_ID_FRESCO_LOGIC 0x1b73
	#define PCI_DEVICE_ID_FRESCO_LOGIC_PDK 0x1000
	#define PCI_DEVICE_ID_FRESCO_LOGIC_FL1400 0x1400

	#define PCI_VENDOR_ID_ETRON 0x1b6f
	#define PCI_DEVICE_ID_ASROCK_P67 0x7023

	#define PCI_DEVICE_ID_INTEL_LYNXPOINT_XHCI 0x8c31
	#define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI 0x9c31

	static const char hcd_name[] = "xhci_hcd";

	/* called after powerup, by probe or system-pm "wakeup" */
	static int xhci_pci_reinit(struct xhci_hcd xhci, struct pci_dev pdev)
	{
	/*
	* TODO: Implement finding debug ports later.
	* TODO: see if there are any quirks that need to be added to handle
	* new extended capabilities.
	*/

	/* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
	if (!pci_set_mwi(pdev))
	xhci_dbg(xhci, "MWI active\n");

	xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
	return 0;
	}

	static void xhci_pci_quirks(struct device dev, struct xhci_hcd xhci)
	{
	struct pci_dev *pdev = to_pci_dev(dev);

	/* Look for vendor-specific quirks */
	if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
	(pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK \|\|
	pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_FL1400)) {
	if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
	pdev->revision == 0x0) {
	xhci->quirks \|= XHCI_RESET_EP_QUIRK;
	xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
	"QUIRK: Fresco Logic xHC needs configure"
	" endpoint cmd after reset endpoint");
	}
	if (pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK &&
	pdev->revision == 0x4) {
	xhci->quirks \|= XHCI_SLOW_SUSPEND;
	xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
	"QUIRK: Fresco Logic xHC revision %u"
	"must be suspended extra slowly",
	pdev->revision);
	}
	/* Fresco Logic confirms: all revisions of this chip do not
	* support MSI, even though some of them claim to in their PCI
	* capabilities.
	*/
	xhci->quirks \|= XHCI_BROKEN_MSI;
	xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
	"QUIRK: Fresco Logic revision %u "
	"has broken MSI implementation",
	pdev->revision);
	xhci->quirks \|= XHCI_TRUST_TX_LENGTH;
	}

	if (pdev->vendor == PCI_VENDOR_ID_NEC)
	xhci->quirks \|= XHCI_NEC_HOST;

	if (pdev->vendor == PCI_VENDOR_ID_AMD && xhci->hci_version == 0x96)
	xhci->quirks \|= XHCI_AMD_0x96_HOST;

	/* AMD PLL quirk */
	if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info())
	xhci->quirks \|= XHCI_AMD_PLL_FIX;
	if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
	xhci->quirks \|= XHCI_LPM_SUPPORT;
	xhci->quirks \|= XHCI_INTEL_HOST;
	}
	if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
	pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
	xhci->quirks \|= XHCI_EP_LIMIT_QUIRK;
	xhci->limit_active_eps = 64;
	xhci->quirks \|= XHCI_SW_BW_CHECKING;
	/*
	* PPT desktop boards DH77EB and DH77DF will power back on after
	* a few seconds of being shutdown. The fix for this is to
	* switch the ports from xHCI to EHCI on shutdown. We can't use
	* DMI information to find those particular boards (since each
	* vendor will change the board name), so we have to key off all
	* PPT chipsets.
	*/
	xhci->quirks \|= XHCI_SPURIOUS_REBOOT;
	xhci->quirks \|= XHCI_AVOID_BEI;
	}
	if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
	(pdev->device == PCI_DEVICE_ID_INTEL_LYNXPOINT_XHCI \|\|
	pdev->device == PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI)) {
	/* Workaround for occasional spurious wakeups from S5 (or
	* any other sleep) on Haswell machines with LPT and LPT-LP
	* with the new Intel BIOS
	*/
	/* Limit the quirk to only known vendors, as this triggers
	* yet another BIOS bug on some other machines
	* https://bugzilla.kernel.org/show_bug.cgi?id=66171
	*/
	if (pdev->subsystem_vendor == PCI_VENDOR_ID_HP)
	xhci->quirks \|= XHCI_SPURIOUS_WAKEUP;
	}
	if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
	pdev->device == PCI_DEVICE_ID_ASROCK_P67) {
	xhci->quirks \|= XHCI_RESET_ON_RESUME;
	xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
	"QUIRK: Resetting on resume");
	xhci->quirks \|= XHCI_TRUST_TX_LENGTH;
	}
	if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
	pdev->device == 0x0015 &&
	pdev->subsystem_vendor == PCI_VENDOR_ID_SAMSUNG &&
	pdev->subsystem_device == 0xc0cd)
	xhci->quirks \|= XHCI_RESET_ON_RESUME;
	if (pdev->vendor == PCI_VENDOR_ID_VIA)
	xhci->quirks \|= XHCI_RESET_ON_RESUME;
	}

	/* called during probe() after chip reset completes */
	static int xhci_pci_setup(struct usb_hcd *hcd)
	{
	struct xhci_hcd *xhci;
	struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
	int retval;

	retval = xhci_gen_setup(hcd, xhci_pci_quirks);
	if (retval)
	return retval;

	xhci = hcd_to_xhci(hcd);
	if (!usb_hcd_is_primary_hcd(hcd))
	return 0;

	pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
	xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);

	/* Find any debug ports */
	retval = xhci_pci_reinit(xhci, pdev);
	if (!retval)
	return retval;

	kfree(xhci);
	return retval;
	}

	/*
	* We need to register our own PCI probe function (instead of the USB core's
	* function) in order to create a second roothub under xHCI.
	*/
	static int xhci_pci_probe(struct pci_dev dev, const struct pci_device_id id)
	{
	int retval;
	struct xhci_hcd *xhci;
	struct hc_driver *driver;
	struct usb_hcd *hcd;

	driver = (struct hc_driver *)id->driver_data;

	/* Prevent runtime suspending between USB-2 and USB-3 initialization */
	pm_runtime_get_noresume(&dev->dev);

	/* Register the USB 2.0 roothub.
	* FIXME: USB core must know to register the USB 2.0 roothub first.
	* This is sort of silly, because we could just set the HCD driver flags
	* to say USB 2.0, but I'm not sure what the implications would be in
	* the other parts of the HCD code.
	*/
	retval = usb_hcd_pci_probe(dev, id);

	if (retval)
	goto put_runtime_pm;

	/* USB 2.0 roothub is stored in the PCI device now. */
	hcd = dev_get_drvdata(&dev->dev);
	xhci = hcd_to_xhci(hcd);
	xhci->shared_hcd = usb_create_shared_hcd(driver, &dev->dev,
	pci_name(dev), hcd);
	if (!xhci->shared_hcd) {
	retval = -ENOMEM;
	goto dealloc_usb2_hcd;
	}

	/* Set the xHCI pointer before xhci_pci_setup() (aka hcd_driver.reset)
	* is called by usb_add_hcd().
	*/
	((struct xhci_hcd *) xhci->shared_hcd->hcd_priv) = xhci;

	retval = usb_add_hcd(xhci->shared_hcd, dev->irq,
	IRQF_SHARED);
	if (retval)
	goto put_usb3_hcd;
	/* Roothub already marked as USB 3.0 speed */

	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
	xhci->shared_hcd->can_do_streams = 1;

	/* USB-2 and USB-3 roothubs initialized, allow runtime pm suspend */
	pm_runtime_put_noidle(&dev->dev);

	return 0;

	put_usb3_hcd:
	usb_put_hcd(xhci->shared_hcd);
	dealloc_usb2_hcd:
	usb_hcd_pci_remove(dev);
	put_runtime_pm:
	pm_runtime_put_noidle(&dev->dev);
	return retval;
	}

	static void xhci_pci_remove(struct pci_dev *dev)
	{
	struct xhci_hcd *xhci;

	xhci = hcd_to_xhci(pci_get_drvdata(dev));
	if (xhci->shared_hcd) {
	usb_remove_hcd(xhci->shared_hcd);
	usb_put_hcd(xhci->shared_hcd);
	}
	usb_hcd_pci_remove(dev);

	/* Workaround for spurious wakeups at shutdown with HSW */
	if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
	pci_set_power_state(dev, PCI_D3hot);

	kfree(xhci);
	}

	#ifdef CONFIG_PM
	static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
	{
	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
	struct pci_dev *pdev = to_pci_dev(hcd->self.controller);

	/*
	* Systems with the TI redriver that loses port status change events
	* need to have the registers polled during D3, so avoid D3cold.
	*/
	if (xhci_compliance_mode_recovery_timer_quirk_check())
	pdev->no_d3cold = true;

	return xhci_suspend(xhci);
	}

	static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
	{
	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
	struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
	int retval = 0;

	/* The BIOS on systems with the Intel Panther Point chipset may or may
	* not support xHCI natively. That means that during system resume, it
	* may switch the ports back to EHCI so that users can use their
	* keyboard to select a kernel from GRUB after resume from hibernate.
	*
	* The BIOS is supposed to remember whether the OS had xHCI ports
	* enabled before resume, and switch the ports back to xHCI when the
	* BIOS/OS semaphore is written, but we all know we can't trust BIOS
	* writers.
	*
	* Unconditionally switch the ports back to xHCI after a system resume.
	* It should not matter whether the EHCI or xHCI controller is
	* resumed first. It's enough to do the switchover in xHCI because
	* USB core won't notice anything as the hub driver doesn't start
	* running again until after all the devices (including both EHCI and
	* xHCI host controllers) have been resumed.
	*/

	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
	usb_enable_intel_xhci_ports(pdev);

	retval = xhci_resume(xhci, hibernated);
	return retval;
	}
	#endif /* CONFIG_PM */

	static const struct hc_driver xhci_pci_hc_driver = {
	.description = hcd_name,
	.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_pci_setup,
	.start = xhci_run,
	#ifdef CONFIG_PM
	.pci_suspend = xhci_pci_suspend,
	.pci_resume = xhci_pci_resume,
	#endif
	.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,
	.enable_device = xhci_enable_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,
	/*
	* call back when device connected and addressed
	*/
	.update_device = xhci_update_device,
	.set_usb2_hw_lpm = xhci_set_usb2_hardware_lpm,
	.enable_usb3_lpm_timeout = xhci_enable_usb3_lpm_timeout,
	.disable_usb3_lpm_timeout = xhci_disable_usb3_lpm_timeout,
	.find_raw_port_number = xhci_find_raw_port_number,
	};

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

	/* PCI driver selection metadata; PCI hotplugging uses this */
	static const struct pci_device_id pci_ids[] = { {
	/* handle any USB 3.0 xHCI controller */
	PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
	.driver_data = (unsigned long) &xhci_pci_hc_driver,
	},
	{ /* end: all zeroes */ }
	};
	MODULE_DEVICE_TABLE(pci, pci_ids);

	/* pci driver glue; this is a "new style" PCI driver module */
	static struct pci_driver xhci_pci_driver = {
	.name = (char *) hcd_name,
	.id_table = pci_ids,

	.probe = xhci_pci_probe,
	.remove = xhci_pci_remove,
	/* suspend and resume implemented later */

	.shutdown = usb_hcd_pci_shutdown,
	#ifdef CONFIG_PM
	.driver = {
	.pm = &usb_hcd_pci_pm_ops
	},
	#endif
	};

	int __init xhci_register_pci(void)
	{
	return pci_register_driver(&xhci_pci_driver);
	}

	void xhci_unregister_pci(void)
	{
	pci_unregister_driver(&xhci_pci_driver);
	}