[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / core / hcd-pci.c

/*
 * (C) Copyright David Brownell 2000-2002
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>
#include <linux/usb.h>

#include <asm/io.h>
#include <asm/irq.h>

#ifdef CONFIG_PPC_PMAC
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/pci-bridge.h>
#include <asm/prom.h>
#endif

#include "usb.h"
#include "hcd.h"


/* PCI-based HCs are common, but plenty of non-PCI HCs are used too */

#ifdef CONFIG_PM_SLEEP

/* Coordinate handoffs between EHCI and companion controllers
 * during system resume
 */

static DEFINE_MUTEX(companions_mutex);

#define CL_UHCI		PCI_CLASS_SERIAL_USB_UHCI
#define CL_OHCI		PCI_CLASS_SERIAL_USB_OHCI
#define CL_EHCI		PCI_CLASS_SERIAL_USB_EHCI

enum companion_action {
	SET_HS_COMPANION, CLEAR_HS_COMPANION, WAIT_FOR_COMPANIONS
};

static void companion_common(struct pci_dev *pdev, struct usb_hcd *hcd,
		enum companion_action action)
{
	struct pci_dev		*companion;
	struct usb_hcd		*companion_hcd;
	unsigned int		slot = PCI_SLOT(pdev->devfn);

	/* Iterate through other PCI functions in the same slot.
	 * If pdev is OHCI or UHCI then we are looking for EHCI, and
	 * vice versa.
	 */
	companion = NULL;
	for (;;) {
		companion = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, companion);
		if (!companion)
			break;
		if (companion->bus != pdev->bus ||
				PCI_SLOT(companion->devfn) != slot)
			continue;

		companion_hcd = pci_get_drvdata(companion);
		if (!companion_hcd)
			continue;

		/* For SET_HS_COMPANION, store a pointer to the EHCI bus in
		 * the OHCI/UHCI companion bus structure.
		 * For CLEAR_HS_COMPANION, clear the pointer to the EHCI bus
		 * in the OHCI/UHCI companion bus structure.
		 * For WAIT_FOR_COMPANIONS, wait until the OHCI/UHCI
		 * companion controllers have fully resumed.
		 */

		if ((pdev->class == CL_OHCI || pdev->class == CL_UHCI) &&
				companion->class == CL_EHCI) {
			/* action must be SET_HS_COMPANION */
			dev_dbg(&companion->dev, "HS companion for %s\n",
					dev_name(&pdev->dev));
			hcd->self.hs_companion = &companion_hcd->self;

		} else if (pdev->class == CL_EHCI &&
				(companion->class == CL_OHCI ||
				companion->class == CL_UHCI)) {
			switch (action) {
			case SET_HS_COMPANION:
				dev_dbg(&pdev->dev, "HS companion for %s\n",
						dev_name(&companion->dev));
				companion_hcd->self.hs_companion = &hcd->self;
				break;
			case CLEAR_HS_COMPANION:
				companion_hcd->self.hs_companion = NULL;
				break;
			case WAIT_FOR_COMPANIONS:
				device_pm_wait_for_dev(&pdev->dev,
						&companion->dev);
				break;
			}
		}
	}
}

static void set_hs_companion(struct pci_dev *pdev, struct usb_hcd *hcd)
{
	mutex_lock(&companions_mutex);
	dev_set_drvdata(&pdev->dev, hcd);
	companion_common(pdev, hcd, SET_HS_COMPANION);
	mutex_unlock(&companions_mutex);
}

static void clear_hs_companion(struct pci_dev *pdev, struct usb_hcd *hcd)
{
	mutex_lock(&companions_mutex);
	dev_set_drvdata(&pdev->dev, NULL);

	/* If pdev is OHCI or UHCI, just clear its hs_companion pointer */
	if (pdev->class == CL_OHCI || pdev->class == CL_UHCI)
		hcd->self.hs_companion = NULL;

	/* Otherwise search for companion buses and clear their pointers */
	else
		companion_common(pdev, hcd, CLEAR_HS_COMPANION);
	mutex_unlock(&companions_mutex);
}

static void wait_for_companions(struct pci_dev *pdev, struct usb_hcd *hcd)
{
	/* Only EHCI controllers need to wait.
	 * No locking is needed because a controller cannot be resumed
	 * while one of its companions is getting unbound.
	 */
	if (pdev->class == CL_EHCI)
		companion_common(pdev, hcd, WAIT_FOR_COMPANIONS);
}

#else /* !CONFIG_PM_SLEEP */

static inline void set_hs_companion(struct pci_dev *d, struct usb_hcd *h) {}
static inline void clear_hs_companion(struct pci_dev *d, struct usb_hcd *h) {}
static inline void wait_for_companions(struct pci_dev *d, struct usb_hcd *h) {}

#endif /* !CONFIG_PM_SLEEP */

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

/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */

/**
 * usb_hcd_pci_probe - initialize PCI-based HCDs
 * @dev: USB Host Controller being probed
 * @id: pci hotplug id connecting controller to HCD framework
 * Context: !in_interrupt()
 *
 * Allocates basic PCI 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_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
	struct hc_driver	*driver;
	struct usb_hcd		*hcd;
	int			retval;

	if (usb_disabled())
		return -ENODEV;

	if (!id)
		return -EINVAL;
	driver = (struct hc_driver *)id->driver_data;
	if (!driver)
		return -EINVAL;

	if (pci_enable_device(dev) < 0)
		return -ENODEV;
	dev->current_state = PCI_D0;

	if (!dev->irq) {
		dev_err(&dev->dev,
			"Found HC with no IRQ.  Check BIOS/PCI %s setup!\n",
			pci_name(dev));
		retval = -ENODEV;
		goto err1;
	}

	hcd = usb_create_hcd(driver, &dev->dev, pci_name(dev));
	if (!hcd) {
		retval = -ENOMEM;
		goto err1;
	}

	if (driver->flags & HCD_MEMORY) {
		/* EHCI, OHCI */
		hcd->rsrc_start = pci_resource_start(dev, 0);
		hcd->rsrc_len = pci_resource_len(dev, 0);
		if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
				driver->description)) {
			dev_dbg(&dev->dev, "controller already in use\n");
			retval = -EBUSY;
			goto err2;
		}
		hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
		if (hcd->regs == NULL) {
			dev_dbg(&dev->dev, "error mapping memory\n");
			retval = -EFAULT;
			goto err3;
		}

	} else {
		/* UHCI */
		int	region;

		for (region = 0; region < PCI_ROM_RESOURCE; region++) {
			if (!(pci_resource_flags(dev, region) &
					IORESOURCE_IO))
				continue;

			hcd->rsrc_start = pci_resource_start(dev, region);
			hcd->rsrc_len = pci_resource_len(dev, region);
			if (request_region(hcd->rsrc_start, hcd->rsrc_len,
					driver->description))
				break;
		}
		if (region == PCI_ROM_RESOURCE) {
			dev_dbg(&dev->dev, "no i/o regions available\n");
			retval = -EBUSY;
			goto err2;
		}
	}

	pci_set_master(dev);

	retval = usb_add_hcd(hcd, dev->irq, IRQF_DISABLED | IRQF_SHARED);
	if (retval != 0)
		goto err4;
	set_hs_companion(dev, hcd);
	return retval;

 err4:
	if (driver->flags & HCD_MEMORY) {
		iounmap(hcd->regs);
 err3:
		release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	} else
		release_region(hcd->rsrc_start, hcd->rsrc_len);
 err2:
	clear_hs_companion(dev, hcd);
	usb_put_hcd(hcd);
 err1:
	pci_disable_device(dev);
	dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
	return retval;
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);


/* may be called without controller electrically present */
/* may be called with controller, bus, and devices active */

/**
 * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
 * @dev: USB Host Controller being removed
 * Context: !in_interrupt()
 *
 * Reverses the effect of usb_hcd_pci_probe(), first invoking
 * the HCD's stop() method.  It is always called from a thread
 * context, normally "rmmod", "apmd", or something similar.
 *
 * Store this function in the HCD's struct pci_driver as remove().
 */
void usb_hcd_pci_remove(struct pci_dev *dev)
{
	struct usb_hcd		*hcd;

	hcd = pci_get_drvdata(dev);
	if (!hcd)
		return;

	usb_remove_hcd(hcd);
	if (hcd->driver->flags & HCD_MEMORY) {
		iounmap(hcd->regs);
		release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	} else {
		release_region(hcd->rsrc_start, hcd->rsrc_len);
	}
	clear_hs_companion(dev, hcd);
	usb_put_hcd(hcd);
	pci_disable_device(dev);
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);

/**
 * usb_hcd_pci_shutdown - shutdown host controller
 * @dev: USB Host Controller being shutdown
 */
void usb_hcd_pci_shutdown(struct pci_dev *dev)
{
	struct usb_hcd		*hcd;

	hcd = pci_get_drvdata(dev);
	if (!hcd)
		return;

	if (hcd->driver->shutdown)
		hcd->driver->shutdown(hcd);
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);

#ifdef	CONFIG_PM_SLEEP

static int check_root_hub_suspended(struct device *dev)
{
	struct pci_dev		*pci_dev = to_pci_dev(dev);
	struct usb_hcd		*hcd = pci_get_drvdata(pci_dev);

	if (!(hcd->state == HC_STATE_SUSPENDED ||
			hcd->state == HC_STATE_HALT)) {
		dev_warn(dev, "Root hub is not suspended\n");
		return -EBUSY;
	}
	return 0;
}

static int hcd_pci_suspend(struct device *dev)
{
	struct pci_dev		*pci_dev = to_pci_dev(dev);
	struct usb_hcd		*hcd = pci_get_drvdata(pci_dev);
	int			retval;

	/* Root hub suspend should have stopped all downstream traffic,
	 * and all bus master traffic.  And done so for both the interface
	 * and the stub usb_device (which we check here).  But maybe it
	 * didn't; writing sysfs power/state files ignores such rules...
	 */
	retval = check_root_hub_suspended(dev);
	if (retval)
		return retval;

	/* We might already be suspended (runtime PM -- not yet written) */
	if (pci_dev->current_state != PCI_D0)
		return retval;

	if (hcd->driver->pci_suspend) {
		retval = hcd->driver->pci_suspend(hcd);
		suspend_report_result(hcd->driver->pci_suspend, retval);
		if (retval)
			return retval;
	}

	synchronize_irq(pci_dev->irq);

	/* Downstream ports from this root hub should already be quiesced, so
	 * there will be no DMA activity.  Now we can shut down the upstream
	 * link (except maybe for PME# resume signaling).  We'll enter a
	 * low power state during suspend_noirq, if the hardware allows.
	 */
	pci_disable_device(pci_dev);
	return retval;
}

static int hcd_pci_suspend_noirq(struct device *dev)
{
	struct pci_dev		*pci_dev = to_pci_dev(dev);
	struct usb_hcd		*hcd = pci_get_drvdata(pci_dev);
	int			retval;

	retval = check_root_hub_suspended(dev);
	if (retval)
		return retval;

	pci_save_state(pci_dev);

	/* If the root hub is HALTed rather than SUSPENDed,
	 * disallow remote wakeup.
	 */
	if (hcd->state == HC_STATE_HALT)
		device_set_wakeup_enable(dev, 0);
	dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev));

	/* Possibly enable remote wakeup,
	 * choose the appropriate low-power state, and go to that state.
	 */
	retval = pci_prepare_to_sleep(pci_dev);
	if (retval == -EIO) {		/* Low-power not supported */
		dev_dbg(dev, "--> PCI D0 legacy\n");
		retval = 0;
	} else if (retval == 0) {
		dev_dbg(dev, "--> PCI %s\n",
				pci_power_name(pci_dev->current_state));
	} else {
		suspend_report_result(pci_prepare_to_sleep, retval);
		return retval;
	}

#ifdef CONFIG_PPC_PMAC
	/* Disable ASIC clocks for USB */
	if (machine_is(powermac)) {
		struct device_node	*of_node;

		of_node = pci_device_to_OF_node(pci_dev);
		if (of_node)
			pmac_call_feature(PMAC_FTR_USB_ENABLE, of_node, 0, 0);
	}
#endif
	return retval;
}

static int hcd_pci_resume_noirq(struct device *dev)
{
	struct pci_dev		*pci_dev = to_pci_dev(dev);

#ifdef CONFIG_PPC_PMAC
	/* Reenable ASIC clocks for USB */
	if (machine_is(powermac)) {
		struct device_node *of_node;

		of_node = pci_device_to_OF_node(pci_dev);
		if (of_node)
			pmac_call_feature(PMAC_FTR_USB_ENABLE,
						of_node, 0, 1);
	}
#endif

	/* Go back to D0 and disable remote wakeup */
	pci_back_from_sleep(pci_dev);
	return 0;
}

static int resume_common(struct device *dev, bool hibernated)
{
	struct pci_dev		*pci_dev = to_pci_dev(dev);
	struct usb_hcd		*hcd = pci_get_drvdata(pci_dev);
	int			retval;

	if (hcd->state != HC_STATE_SUSPENDED) {
		dev_dbg(dev, "can't resume, not suspended!\n");
		return 0;
	}

	retval = pci_enable_device(pci_dev);
	if (retval < 0) {
		dev_err(dev, "can't re-enable after resume, %d!\n", retval);
		return retval;
	}

	pci_set_master(pci_dev);

	clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);

	if (hcd->driver->pci_resume) {
		/* This call should be made only during system resume,
		 * not during runtime resume.
		 */
		wait_for_companions(pci_dev, hcd);

		retval = hcd->driver->pci_resume(hcd, hibernated);
		if (retval) {
			dev_err(dev, "PCI post-resume error %d!\n", retval);
			usb_hc_died(hcd);
		}
	}
	return retval;
}

static int hcd_pci_resume(struct device *dev)
{
	return resume_common(dev, false);
}

static int hcd_pci_restore(struct device *dev)
{
	return resume_common(dev, true);
}

const struct dev_pm_ops usb_hcd_pci_pm_ops = {
	.suspend	= hcd_pci_suspend,
	.suspend_noirq	= hcd_pci_suspend_noirq,
	.resume_noirq	= hcd_pci_resume_noirq,
	.resume		= hcd_pci_resume,
	.freeze		= check_root_hub_suspended,
	.freeze_noirq	= check_root_hub_suspended,
	.thaw_noirq	= NULL,
	.thaw		= NULL,
	.poweroff	= hcd_pci_suspend,
	.poweroff_noirq	= hcd_pci_suspend_noirq,
	.restore_noirq	= hcd_pci_resume_noirq,
	.restore	= hcd_pci_restore,
};
EXPORT_SYMBOL_GPL(usb_hcd_pci_pm_ops);

#endif	/* CONFIG_PM_SLEEP */
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* (C) Copyright David Brownell 2000-2002
34bbe4c1	3	*
1da177e4 LT	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU General Public License as published by the
	6	* Free Software Foundation; either version 2 of the License, or (at your
	7	* option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful, but
	10	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	11	* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	12	* for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software Foundation,
	16	* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	17	*/
	18
1da177e4 LT	19	#include <linux/kernel.h>
	20	#include <linux/module.h>
	21	#include <linux/pci.h>
6d19c009	22	#include <linux/pm_runtime.h>
21b1861f DB	23	#include <linux/usb.h>
21b1861f DB	24
1da177e4 LT	25	#include <asm/io.h>
1da177e4 LT	26	#include <asm/irq.h>
21b1861f DB	27
	28	#ifdef CONFIG_PPC_PMAC
	29	#include <asm/machdep.h>
	30	#include <asm/pmac_feature.h>
	31	#include <asm/pci-bridge.h>
	32	#include <asm/prom.h>
	33	#endif
5f827ea3 DB	34
5f827ea3 DB	35	#include "usb.h"
1da177e4 LT	36	#include "hcd.h"
	37
	38
c6053ecf	39	/* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
1da177e4	40
6d19c009 AS	41	#ifdef CONFIG_PM_SLEEP
	42
	43	/* Coordinate handoffs between EHCI and companion controllers
	44	* during system resume
	45	*/
	46
	47	static DEFINE_MUTEX(companions_mutex);
	48
	49	#define CL_UHCI PCI_CLASS_SERIAL_USB_UHCI
	50	#define CL_OHCI PCI_CLASS_SERIAL_USB_OHCI
	51	#define CL_EHCI PCI_CLASS_SERIAL_USB_EHCI
	52
	53	enum companion_action {
	54	SET_HS_COMPANION, CLEAR_HS_COMPANION, WAIT_FOR_COMPANIONS
	55	};
	56
	57	static void companion_common(struct pci_dev pdev, struct usb_hcd hcd,
	58	enum companion_action action)
	59	{
	60	struct pci_dev *companion;
	61	struct usb_hcd *companion_hcd;
	62	unsigned int slot = PCI_SLOT(pdev->devfn);
	63
	64	/* Iterate through other PCI functions in the same slot.
	65	* If pdev is OHCI or UHCI then we are looking for EHCI, and
	66	* vice versa.
	67	*/
	68	companion = NULL;
	69	for (;;) {
	70	companion = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, companion);
	71	if (!companion)
	72	break;
	73	if (companion->bus != pdev->bus \|\|
	74	PCI_SLOT(companion->devfn) != slot)
	75	continue;
	76
	77	companion_hcd = pci_get_drvdata(companion);
	78	if (!companion_hcd)
	79	continue;
	80
	81	/* For SET_HS_COMPANION, store a pointer to the EHCI bus in
	82	* the OHCI/UHCI companion bus structure.
	83	* For CLEAR_HS_COMPANION, clear the pointer to the EHCI bus
	84	* in the OHCI/UHCI companion bus structure.
	85	* For WAIT_FOR_COMPANIONS, wait until the OHCI/UHCI
	86	* companion controllers have fully resumed.
	87	*/
	88
	89	if ((pdev->class == CL_OHCI \|\| pdev->class == CL_UHCI) &&
	90	companion->class == CL_EHCI) {
	91	/* action must be SET_HS_COMPANION */
	92	dev_dbg(&companion->dev, "HS companion for %s\n",
	93	dev_name(&pdev->dev));
	94	hcd->self.hs_companion = &companion_hcd->self;
	95
	96	} else if (pdev->class == CL_EHCI &&
	97	(companion->class == CL_OHCI \|\|
	98	companion->class == CL_UHCI)) {
	99	switch (action) {
	100	case SET_HS_COMPANION:
	101	dev_dbg(&pdev->dev, "HS companion for %s\n",
	102	dev_name(&companion->dev));
	103	companion_hcd->self.hs_companion = &hcd->self;
	104	break;
105	case CLEAR_HS_COMPANION:
106	companion_hcd->self.hs_companion = NULL;
107	break;
108	case WAIT_FOR_COMPANIONS:
109	device_pm_wait_for_dev(&pdev->dev,
110	&companion->dev);
111	break;
112	}
113	}
114	}
115	}
116
117	static void set_hs_companion(struct pci_dev pdev, struct usb_hcd hcd)
118	{
119	mutex_lock(&companions_mutex);
120	dev_set_drvdata(&pdev->dev, hcd);
121	companion_common(pdev, hcd, SET_HS_COMPANION);
122	mutex_unlock(&companions_mutex);
123	}
124
125	static void clear_hs_companion(struct pci_dev pdev, struct usb_hcd hcd)
126	{
127	mutex_lock(&companions_mutex);
128	dev_set_drvdata(&pdev->dev, NULL);
129
130	/* If pdev is OHCI or UHCI, just clear its hs_companion pointer */
131	if (pdev->class == CL_OHCI \|\| pdev->class == CL_UHCI)
132	hcd->self.hs_companion = NULL;
133
134	/* Otherwise search for companion buses and clear their pointers */
135	else
136	companion_common(pdev, hcd, CLEAR_HS_COMPANION);
137	mutex_unlock(&companions_mutex);
138	}
139
140	static void wait_for_companions(struct pci_dev pdev, struct usb_hcd hcd)
141	{
142	/* Only EHCI controllers need to wait.
143	* No locking is needed because a controller cannot be resumed
144	* while one of its companions is getting unbound.
145	*/
146	if (pdev->class == CL_EHCI)
147	companion_common(pdev, hcd, WAIT_FOR_COMPANIONS);
148	}
149
150	#else /* !CONFIG_PM_SLEEP */
151
152	static inline void set_hs_companion(struct pci_dev d, struct usb_hcd h) {}
153	static inline void clear_hs_companion(struct pci_dev d, struct usb_hcd h) {}
154	static inline void wait_for_companions(struct pci_dev d, struct usb_hcd h) {}
155
156	#endif /* !CONFIG_PM_SLEEP */
1da177e4 LT	157
	158	/-------------------------------------------------------------------------/
	159
	160	/* configure so an HC device and id are always provided */
	161	/* always called with process context; sleeping is OK */
	162
	163	/**
	164	* usb_hcd_pci_probe - initialize PCI-based HCDs
	165	* @dev: USB Host Controller being probed
	166	* @id: pci hotplug id connecting controller to HCD framework
	167	* Context: !in_interrupt()
	168	*
	169	* Allocates basic PCI resources for this USB host controller, and
	170	* then invokes the start() method for the HCD associated with it
	171	* through the hotplug entry's driver_data.
	172	*
	173	* Store this function in the HCD's struct pci_driver as probe().
	174	*/
34bbe4c1	175	int usb_hcd_pci_probe(struct pci_dev dev, const struct pci_device_id id)
1da177e4 LT	176	{
	177	struct hc_driver *driver;
	178	struct usb_hcd *hcd;
	179	int retval;
	180
	181	if (usb_disabled())
	182	return -ENODEV;
	183
34bbe4c1 GKH	184	if (!id)
	185	return -EINVAL;
	186	driver = (struct hc_driver *)id->driver_data;
	187	if (!driver)
1da177e4 LT	188	return -EINVAL;
1da177e4 LT	189
34bbe4c1	190	if (pci_enable_device(dev) < 0)
1da177e4	191	return -ENODEV;
c6053ecf	192	dev->current_state = PCI_D0;
34bbe4c1 GKH	193
	194	if (!dev->irq) {
	195	dev_err(&dev->dev,
1da177e4 LT	196	"Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
1da177e4 LT	197	pci_name(dev));
34bbe4c1	198	retval = -ENODEV;
1da177e4	199	goto err1;
34bbe4c1	200	}
1da177e4	201
34bbe4c1	202	hcd = usb_create_hcd(driver, &dev->dev, pci_name(dev));
1da177e4 LT	203	if (!hcd) {
	204	retval = -ENOMEM;
	205	goto err1;
	206	}
	207
34bbe4c1 GKH	208	if (driver->flags & HCD_MEMORY) {
	209	/* EHCI, OHCI */
	210	hcd->rsrc_start = pci_resource_start(dev, 0);
	211	hcd->rsrc_len = pci_resource_len(dev, 0);
	212	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
1da177e4	213	driver->description)) {
34bbe4c1	214	dev_dbg(&dev->dev, "controller already in use\n");
1da177e4 LT	215	retval = -EBUSY;
	216	goto err2;
	217	}
34bbe4c1	218	hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
1da177e4	219	if (hcd->regs == NULL) {
34bbe4c1	220	dev_dbg(&dev->dev, "error mapping memory\n");
1da177e4 LT	221	retval = -EFAULT;
	222	goto err3;
	223	}
	224
34bbe4c1 GKH	225	} else {
34bbe4c1 GKH	226	/* UHCI */
1da177e4 LT	227	int region;
	228
	229	for (region = 0; region < PCI_ROM_RESOURCE; region++) {
34bbe4c1	230	if (!(pci_resource_flags(dev, region) &
1da177e4 LT	231	IORESOURCE_IO))
	232	continue;
	233
34bbe4c1 GKH	234	hcd->rsrc_start = pci_resource_start(dev, region);
	235	hcd->rsrc_len = pci_resource_len(dev, region);
	236	if (request_region(hcd->rsrc_start, hcd->rsrc_len,
1da177e4 LT	237	driver->description))
	238	break;
	239	}
	240	if (region == PCI_ROM_RESOURCE) {
34bbe4c1	241	dev_dbg(&dev->dev, "no i/o regions available\n");
1da177e4	242	retval = -EBUSY;
6d19c009	243	goto err2;
1da177e4 LT	244	}
	245	}
	246
34bbe4c1	247	pci_set_master(dev);
1da177e4	248
442258e2	249	retval = usb_add_hcd(hcd, dev->irq, IRQF_DISABLED \| IRQF_SHARED);
1da177e4 LT	250	if (retval != 0)
1da177e4 LT	251	goto err4;
6d19c009	252	set_hs_companion(dev, hcd);
1da177e4 LT	253	return retval;
	254
	255	err4:
	256	if (driver->flags & HCD_MEMORY) {
34bbe4c1	257	iounmap(hcd->regs);
1da177e4	258	err3:
34bbe4c1	259	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
1da177e4	260	} else
34bbe4c1	261	release_region(hcd->rsrc_start, hcd->rsrc_len);
1da177e4	262	err2:
6d19c009	263	clear_hs_companion(dev, hcd);
34bbe4c1	264	usb_put_hcd(hcd);
1da177e4	265	err1:
34bbe4c1 GKH	266	pci_disable_device(dev);
34bbe4c1 GKH	267	dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
1da177e4	268	return retval;
34bbe4c1	269	}
782e70c6	270	EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);
1da177e4 LT	271
	272
	273	/* may be called without controller electrically present */
	274	/* may be called with controller, bus, and devices active */
	275
	276	/**
	277	* usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
	278	* @dev: USB Host Controller being removed
	279	* Context: !in_interrupt()
	280	*
	281	* Reverses the effect of usb_hcd_pci_probe(), first invoking
	282	* the HCD's stop() method. It is always called from a thread
	283	* context, normally "rmmod", "apmd", or something similar.
	284	*
	285	* Store this function in the HCD's struct pci_driver as remove().
	286	*/
34bbe4c1	287	void usb_hcd_pci_remove(struct pci_dev *dev)
1da177e4 LT	288	{
	289	struct usb_hcd *hcd;
	290
	291	hcd = pci_get_drvdata(dev);
	292	if (!hcd)
	293	return;
	294
34bbe4c1	295	usb_remove_hcd(hcd);
1da177e4	296	if (hcd->driver->flags & HCD_MEMORY) {
34bbe4c1 GKH	297	iounmap(hcd->regs);
34bbe4c1 GKH	298	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
1da177e4	299	} else {
34bbe4c1	300	release_region(hcd->rsrc_start, hcd->rsrc_len);
1da177e4	301	}
6d19c009	302	clear_hs_companion(dev, hcd);
34bbe4c1	303	usb_put_hcd(hcd);
1da177e4 LT	304	pci_disable_device(dev);
1da177e4 LT	305	}
782e70c6	306	EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
1da177e4	307
1da177e4	308	/**
abb30641 AS	309	* usb_hcd_pci_shutdown - shutdown host controller
abb30641 AS	310	* @dev: USB Host Controller being shutdown
1da177e4	311	*/
abb30641 AS	312	void usb_hcd_pci_shutdown(struct pci_dev *dev)
	313	{
	314	struct usb_hcd *hcd;
	315
	316	hcd = pci_get_drvdata(dev);
	317	if (!hcd)
	318	return;
	319
	320	if (hcd->driver->shutdown)
	321	hcd->driver->shutdown(hcd);
	322	}
	323	EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
	324
	325	#ifdef CONFIG_PM_SLEEP
	326
	327	static int check_root_hub_suspended(struct device *dev)
	328	{
	329	struct pci_dev *pci_dev = to_pci_dev(dev);
	330	struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
	331
	332	if (!(hcd->state == HC_STATE_SUSPENDED \|\|
	333	hcd->state == HC_STATE_HALT)) {
	334	dev_warn(dev, "Root hub is not suspended\n");
	335	return -EBUSY;
	336	}
	337	return 0;
	338	}
	339
	340	static int hcd_pci_suspend(struct device *dev)
1da177e4	341	{
abb30641 AS	342	struct pci_dev *pci_dev = to_pci_dev(dev);
	343	struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
	344	int retval;
1da177e4	345
5f827ea3 DB	346	/* Root hub suspend should have stopped all downstream traffic,
	347	* and all bus master traffic. And done so for both the interface
	348	* and the stub usb_device (which we check here). But maybe it
	349	* didn't; writing sysfs power/state files ignores such rules...
5f827ea3	350	*/
abb30641 AS	351	retval = check_root_hub_suspended(dev);
	352	if (retval)
	353	return retval;
a0d4922d AS	354
a0d4922d AS	355	/* We might already be suspended (runtime PM -- not yet written) */
abb30641 AS	356	if (pci_dev->current_state != PCI_D0)
abb30641 AS	357	return retval;
5f827ea3	358
7be7d741	359	if (hcd->driver->pci_suspend) {
6ec4beb5	360	retval = hcd->driver->pci_suspend(hcd);
7be7d741	361	suspend_report_result(hcd->driver->pci_suspend, retval);
02669492	362	if (retval)
abb30641	363	return retval;
5f827ea3 DB	364	}
5f827ea3 DB	365
abb30641	366	synchronize_irq(pci_dev->irq);
c6053ecf	367
a15d95a0 RW	368	/* Downstream ports from this root hub should already be quiesced, so
a15d95a0 RW	369	* there will be no DMA activity. Now we can shut down the upstream
abb30641 AS	370	* link (except maybe for PME# resume signaling). We'll enter a
abb30641 AS	371	* low power state during suspend_noirq, if the hardware allows.
a15d95a0	372	*/
abb30641 AS	373	pci_disable_device(pci_dev);
	374	return retval;
	375	}
	376
	377	static int hcd_pci_suspend_noirq(struct device *dev)
	378	{
	379	struct pci_dev *pci_dev = to_pci_dev(dev);
	380	struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
	381	int retval;
	382
	383	retval = check_root_hub_suspended(dev);
	384	if (retval)
	385	return retval;
a15d95a0	386
abb30641	387	pci_save_state(pci_dev);
a15d95a0	388
abb30641 AS	389	/* If the root hub is HALTed rather than SUSPENDed,
abb30641 AS	390	* disallow remote wakeup.
1da177e4	391	*/
abb30641 AS	392	if (hcd->state == HC_STATE_HALT)
	393	device_set_wakeup_enable(dev, 0);
	394	dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev));
a0d4922d	395
abb30641 AS	396	/* Possibly enable remote wakeup,
	397	* choose the appropriate low-power state, and go to that state.
	398	*/
	399	retval = pci_prepare_to_sleep(pci_dev);
	400	if (retval == -EIO) { /* Low-power not supported */
	401	dev_dbg(dev, "--> PCI D0 legacy\n");
	402	retval = 0;
	403	} else if (retval == 0) {
	404	dev_dbg(dev, "--> PCI %s\n",
	405	pci_power_name(pci_dev->current_state));
a0d4922d	406	} else {
abb30641 AS	407	suspend_report_result(pci_prepare_to_sleep, retval);
abb30641 AS	408	return retval;
1da177e4 LT	409	}
1da177e4 LT	410
21b1861f	411	#ifdef CONFIG_PPC_PMAC
abb30641 AS	412	/* Disable ASIC clocks for USB */
	413	if (machine_is(powermac)) {
	414	struct device_node *of_node;
	415
	416	of_node = pci_device_to_OF_node(pci_dev);
	417	if (of_node)
	418	pmac_call_feature(PMAC_FTR_USB_ENABLE, of_node, 0, 0);
21b1861f	419	}
a0d4922d	420	#endif
1da177e4 LT	421	return retval;
1da177e4 LT	422	}
1da177e4	423
abb30641	424	static int hcd_pci_resume_noirq(struct device *dev)
a0d4922d	425	{
abb30641	426	struct pci_dev *pci_dev = to_pci_dev(dev);
a0d4922d	427
a15d95a0 RW	428	#ifdef CONFIG_PPC_PMAC
	429	/* Reenable ASIC clocks for USB */
	430	if (machine_is(powermac)) {
	431	struct device_node *of_node;
	432
abb30641	433	of_node = pci_device_to_OF_node(pci_dev);
a15d95a0 RW	434	if (of_node)
	435	pmac_call_feature(PMAC_FTR_USB_ENABLE,
	436	of_node, 0, 1);
	437	}
	438	#endif
	439
abb30641 AS	440	/* Go back to D0 and disable remote wakeup */
	441	pci_back_from_sleep(pci_dev);
	442	return 0;
	443	}
	444
	445	static int resume_common(struct device *dev, bool hibernated)
	446	{
	447	struct pci_dev *pci_dev = to_pci_dev(dev);
	448	struct usb_hcd *hcd = pci_get_drvdata(pci_dev);
	449	int retval;
3494252d	450
a0d4922d	451	if (hcd->state != HC_STATE_SUSPENDED) {
abb30641	452	dev_dbg(dev, "can't resume, not suspended!\n");
a0d4922d	453	return 0;
c6053ecf DB	454	}
c6053ecf DB	455
abb30641	456	retval = pci_enable_device(pci_dev);
c6053ecf	457	if (retval < 0) {
abb30641	458	dev_err(dev, "can't re-enable after resume, %d!\n", retval);
c6053ecf DB	459	return retval;
c6053ecf DB	460	}
a0d4922d	461
abb30641	462	pci_set_master(pci_dev);
c6053ecf	463
8de98402	464	clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
1da177e4	465
7be7d741	466	if (hcd->driver->pci_resume) {
6d19c009 AS	467	/* This call should be made only during system resume,
	468	* not during runtime resume.
	469	*/
	470	wait_for_companions(pci_dev, hcd);
	471
6ec4beb5	472	retval = hcd->driver->pci_resume(hcd, hibernated);
5f827ea3	473	if (retval) {
abb30641	474	dev_err(dev, "PCI post-resume error %d!\n", retval);
34bbe4c1	475	usb_hc_died(hcd);
5f827ea3	476	}
1da177e4	477	}
1da177e4 LT	478	return retval;
1da177e4 LT	479	}
1da177e4	480
abb30641	481	static int hcd_pci_resume(struct device *dev)
64a21d02	482	{
abb30641 AS	483	return resume_common(dev, false);
abb30641 AS	484	}
64a21d02	485
abb30641 AS	486	static int hcd_pci_restore(struct device *dev)
	487	{
	488	return resume_common(dev, true);
64a21d02	489	}
1da177e4	490
47145210	491	const struct dev_pm_ops usb_hcd_pci_pm_ops = {
abb30641 AS	492	.suspend = hcd_pci_suspend,
	493	.suspend_noirq = hcd_pci_suspend_noirq,
	494	.resume_noirq = hcd_pci_resume_noirq,
	495	.resume = hcd_pci_resume,
	496	.freeze = check_root_hub_suspended,
	497	.freeze_noirq = check_root_hub_suspended,
	498	.thaw_noirq = NULL,
	499	.thaw = NULL,
	500	.poweroff = hcd_pci_suspend,
	501	.poweroff_noirq = hcd_pci_suspend_noirq,
	502	.restore_noirq = hcd_pci_resume_noirq,
	503	.restore = hcd_pci_restore,
	504	};
	505	EXPORT_SYMBOL_GPL(usb_hcd_pci_pm_ops);
	506
	507	#endif /* CONFIG_PM_SLEEP */