[linux-2.6-block.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/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 */


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

/* 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 err1;
		}
	}

	pci_set_master(dev);
	device_set_wakeup_enable(&dev->dev, 1);

	retval = usb_add_hcd(hcd, dev->irq, IRQF_DISABLED | IRQF_SHARED);
	if (retval != 0)
		goto err4;
	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:
	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);
	}
	usb_put_hcd(hcd);
	pci_disable_device(dev);
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);


#ifdef	CONFIG_PM

/**
 * usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
 * @dev: USB Host Controller being suspended
 * @message: Power Management message describing this state transition
 *
 * Store this function in the HCD's struct pci_driver as .suspend.
 */
int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t message)
{
	struct usb_hcd		*hcd = pci_get_drvdata(dev);
	int			retval = 0;
	int			wake, w;

	/* 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...
	 *
	 * We must ignore the FREEZE vs SUSPEND distinction here, because
	 * otherwise the swsusp will save (and restore) garbage state.
	 */
	if (!(hcd->state == HC_STATE_SUSPENDED ||
			hcd->state == HC_STATE_HALT)) {
		dev_warn(&dev->dev, "Root hub is not suspended\n");
		retval = -EBUSY;
		goto done;
	}

	/* We might already be suspended (runtime PM -- not yet written) */
	if (dev->current_state != PCI_D0)
		goto done;

	if (hcd->driver->pci_suspend) {
		retval = hcd->driver->pci_suspend(hcd, message);
		suspend_report_result(hcd->driver->pci_suspend, retval);
		if (retval)
			goto done;
	}

	synchronize_irq(dev->irq);

	/* Don't fail on error to enable wakeup.  We rely on pci code
	 * to reject requests the hardware can't implement, rather
	 * than coding the same thing.
	 */
	wake = (hcd->state == HC_STATE_SUSPENDED &&
			device_may_wakeup(&dev->dev));
	w = pci_wake_from_d3(dev, wake);
	if (w < 0)
		wake = w;
	dev_dbg(&dev->dev, "wakeup: %d\n", wake);

	/* 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) and enter some PCI
	 * low power state, if the hardware allows.
	 */
	pci_disable_device(dev);
 done:
	return retval;
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend);

/**
 * usb_hcd_pci_suspend_late - suspend a PCI-based HCD after IRQs are disabled
 * @dev: USB Host Controller being suspended
 * @message: Power Management message describing this state transition
 *
 * Store this function in the HCD's struct pci_driver as .suspend_late.
 */
int usb_hcd_pci_suspend_late(struct pci_dev *dev, pm_message_t message)
{
	int			retval = 0;
	int			has_pci_pm;

	/* We might already be suspended (runtime PM -- not yet written) */
	if (dev->current_state != PCI_D0)
		goto done;

	pci_save_state(dev);

	/* Don't change state if we don't need to */
	if (message.event == PM_EVENT_FREEZE ||
			message.event == PM_EVENT_PRETHAW) {
		dev_dbg(&dev->dev, "--> no state change\n");
		goto done;
	}

	has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
	if (!has_pci_pm) {
		dev_dbg(&dev->dev, "--> PCI D0 legacy\n");
	} else {

		/* NOTE:  dev->current_state becomes nonzero only here, and
		 * only for devices that support PCI PM.  Also, exiting
		 * PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
		 * some device state (e.g. as part of clock reinit).
		 */
		retval = pci_set_power_state(dev, PCI_D3hot);
		suspend_report_result(pci_set_power_state, retval);
		if (retval == 0) {
			dev_dbg(&dev->dev, "--> PCI D3\n");
		} else {
			dev_dbg(&dev->dev, "PCI D3 suspend fail, %d\n",
					retval);
			pci_restore_state(dev);
		}
	}

#ifdef CONFIG_PPC_PMAC
	if (retval == 0) {
		/* Disable ASIC clocks for USB */
		if (machine_is(powermac)) {
			struct device_node	*of_node;

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

 done:
	return retval;
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend_late);

/**
 * usb_hcd_pci_resume_early - resume a PCI-based HCD before IRQs are enabled
 * @dev: USB Host Controller being resumed
 *
 * Store this function in the HCD's struct pci_driver as .resume_early.
 */
int usb_hcd_pci_resume_early(struct pci_dev *dev)
{
	int		retval = 0;
	pci_power_t	state = dev->current_state;

#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(dev);
		if (of_node)
			pmac_call_feature(PMAC_FTR_USB_ENABLE,
						of_node, 0, 1);
	}
#endif

	/* NOTE:  chip docs cover clean "real suspend" cases (what Linux
	 * calls "standby", "suspend to RAM", and so on).  There are also
	 * dirty cases when swsusp fakes a suspend in "shutdown" mode.
	 */
	if (state != PCI_D0) {
#ifdef	DEBUG
		int	pci_pm;
		u16	pmcr;

		pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
		pci_read_config_word(dev, pci_pm + PCI_PM_CTRL, &pmcr);
		pmcr &= PCI_PM_CTRL_STATE_MASK;
		if (pmcr) {
			/* Clean case:  power to USB and to HC registers was
			 * maintained; remote wakeup is easy.
			 */
			dev_dbg(&dev->dev, "resume from PCI D%d\n", pmcr);
		} else {
			/* Clean:  HC lost Vcc power, D0 uninitialized
			 *   + Vaux may have preserved port and transceiver
			 *     state ... for remote wakeup from D3cold
			 *   + or not; HCD must reinit + re-enumerate
			 *
			 * Dirty: D0 semi-initialized cases with swsusp
			 *   + after BIOS init
			 *   + after Linux init (HCD statically linked)
			 */
			dev_dbg(&dev->dev, "resume from previous PCI D%d\n",
					state);
		}
#endif

		retval = pci_set_power_state(dev, PCI_D0);
	} else {
		/* Same basic cases: clean (powered/not), dirty */
		dev_dbg(&dev->dev, "PCI legacy resume\n");
	}

	if (retval < 0)
		dev_err(&dev->dev, "can't resume: %d\n", retval);
	else
		pci_restore_state(dev);

	return retval;
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_resume_early);

/**
 * usb_hcd_pci_resume - power management resume of a PCI-based HCD
 * @dev: USB Host Controller being resumed
 *
 * Store this function in the HCD's struct pci_driver as .resume.
 */
int usb_hcd_pci_resume(struct pci_dev *dev)
{
	struct usb_hcd		*hcd;
	int			retval;

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

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

	pci_set_master(dev);

	/* yes, ignore this result too... */
	(void) pci_wake_from_d3(dev, 0);

	clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);

	if (hcd->driver->pci_resume) {
		retval = hcd->driver->pci_resume(hcd);
		if (retval) {
			dev_err(hcd->self.controller,
				"PCI post-resume error %d!\n", retval);
			usb_hc_died(hcd);
		}
	}
	return retval;
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_resume);

#endif	/* CONFIG_PM */

/**
 * 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);
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>
21b1861f DB	22	#include <linux/usb.h>
21b1861f DB	23
1da177e4 LT	24	#include <asm/io.h>
1da177e4 LT	25	#include <asm/irq.h>
21b1861f DB	26
	27	#ifdef CONFIG_PPC_PMAC
	28	#include <asm/machdep.h>
	29	#include <asm/pmac_feature.h>
	30	#include <asm/pci-bridge.h>
	31	#include <asm/prom.h>
	32	#endif
5f827ea3 DB	33
5f827ea3 DB	34	#include "usb.h"
1da177e4 LT	35	#include "hcd.h"
	36
	37
c6053ecf	38	/* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
1da177e4 LT	39
	40
	41	/-------------------------------------------------------------------------/
	42
	43	/* configure so an HC device and id are always provided */
	44	/* always called with process context; sleeping is OK */
	45
	46	/**
	47	* usb_hcd_pci_probe - initialize PCI-based HCDs
	48	* @dev: USB Host Controller being probed
	49	* @id: pci hotplug id connecting controller to HCD framework
	50	* Context: !in_interrupt()
	51	*
	52	* Allocates basic PCI resources for this USB host controller, and
	53	* then invokes the start() method for the HCD associated with it
	54	* through the hotplug entry's driver_data.
	55	*
	56	* Store this function in the HCD's struct pci_driver as probe().
	57	*/
34bbe4c1	58	int usb_hcd_pci_probe(struct pci_dev dev, const struct pci_device_id id)
1da177e4 LT	59	{
	60	struct hc_driver *driver;
	61	struct usb_hcd *hcd;
	62	int retval;
	63
	64	if (usb_disabled())
	65	return -ENODEV;
	66
34bbe4c1 GKH	67	if (!id)
	68	return -EINVAL;
	69	driver = (struct hc_driver *)id->driver_data;
	70	if (!driver)
1da177e4 LT	71	return -EINVAL;
1da177e4 LT	72
34bbe4c1	73	if (pci_enable_device(dev) < 0)
1da177e4	74	return -ENODEV;
c6053ecf	75	dev->current_state = PCI_D0;
34bbe4c1 GKH	76
	77	if (!dev->irq) {
	78	dev_err(&dev->dev,
1da177e4 LT	79	"Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
1da177e4 LT	80	pci_name(dev));
34bbe4c1	81	retval = -ENODEV;
1da177e4	82	goto err1;
34bbe4c1	83	}
1da177e4	84
34bbe4c1	85	hcd = usb_create_hcd(driver, &dev->dev, pci_name(dev));
1da177e4 LT	86	if (!hcd) {
	87	retval = -ENOMEM;
	88	goto err1;
	89	}
	90
34bbe4c1 GKH	91	if (driver->flags & HCD_MEMORY) {
	92	/* EHCI, OHCI */
	93	hcd->rsrc_start = pci_resource_start(dev, 0);
	94	hcd->rsrc_len = pci_resource_len(dev, 0);
	95	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
1da177e4	96	driver->description)) {
34bbe4c1	97	dev_dbg(&dev->dev, "controller already in use\n");
1da177e4 LT	98	retval = -EBUSY;
	99	goto err2;
	100	}
34bbe4c1	101	hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
1da177e4	102	if (hcd->regs == NULL) {
34bbe4c1	103	dev_dbg(&dev->dev, "error mapping memory\n");
1da177e4 LT	104	retval = -EFAULT;
	105	goto err3;
	106	}
	107
34bbe4c1 GKH	108	} else {
34bbe4c1 GKH	109	/* UHCI */
1da177e4 LT	110	int region;
	111
	112	for (region = 0; region < PCI_ROM_RESOURCE; region++) {
34bbe4c1	113	if (!(pci_resource_flags(dev, region) &
1da177e4 LT	114	IORESOURCE_IO))
	115	continue;
	116
34bbe4c1 GKH	117	hcd->rsrc_start = pci_resource_start(dev, region);
	118	hcd->rsrc_len = pci_resource_len(dev, region);
	119	if (request_region(hcd->rsrc_start, hcd->rsrc_len,
1da177e4 LT	120	driver->description))
	121	break;
	122	}
	123	if (region == PCI_ROM_RESOURCE) {
34bbe4c1	124	dev_dbg(&dev->dev, "no i/o regions available\n");
1da177e4 LT	125	retval = -EBUSY;
	126	goto err1;
	127	}
	128	}
	129
34bbe4c1	130	pci_set_master(dev);
6fd9086a	131	device_set_wakeup_enable(&dev->dev, 1);
1da177e4	132
442258e2	133	retval = usb_add_hcd(hcd, dev->irq, IRQF_DISABLED \| IRQF_SHARED);
1da177e4 LT	134	if (retval != 0)
	135	goto err4;
	136	return retval;
	137
	138	err4:
	139	if (driver->flags & HCD_MEMORY) {
34bbe4c1	140	iounmap(hcd->regs);
1da177e4	141	err3:
34bbe4c1	142	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
1da177e4	143	} else
34bbe4c1	144	release_region(hcd->rsrc_start, hcd->rsrc_len);
1da177e4	145	err2:
34bbe4c1	146	usb_put_hcd(hcd);
1da177e4	147	err1:
34bbe4c1 GKH	148	pci_disable_device(dev);
34bbe4c1 GKH	149	dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
1da177e4	150	return retval;
34bbe4c1	151	}
782e70c6	152	EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);
1da177e4 LT	153
	154
	155	/* may be called without controller electrically present */
	156	/* may be called with controller, bus, and devices active */
	157
	158	/**
	159	* usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
	160	* @dev: USB Host Controller being removed
	161	* Context: !in_interrupt()
	162	*
	163	* Reverses the effect of usb_hcd_pci_probe(), first invoking
	164	* the HCD's stop() method. It is always called from a thread
	165	* context, normally "rmmod", "apmd", or something similar.
	166	*
	167	* Store this function in the HCD's struct pci_driver as remove().
	168	*/
34bbe4c1	169	void usb_hcd_pci_remove(struct pci_dev *dev)
1da177e4 LT	170	{
	171	struct usb_hcd *hcd;
	172
	173	hcd = pci_get_drvdata(dev);
	174	if (!hcd)
	175	return;
	176
34bbe4c1	177	usb_remove_hcd(hcd);
1da177e4	178	if (hcd->driver->flags & HCD_MEMORY) {
34bbe4c1 GKH	179	iounmap(hcd->regs);
34bbe4c1 GKH	180	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
1da177e4	181	} else {
34bbe4c1	182	release_region(hcd->rsrc_start, hcd->rsrc_len);
1da177e4	183	}
34bbe4c1	184	usb_put_hcd(hcd);
1da177e4 LT	185	pci_disable_device(dev);
1da177e4 LT	186	}
782e70c6	187	EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
1da177e4 LT	188
	189
	190	#ifdef CONFIG_PM
	191
1da177e4 LT	192	/**
	193	* usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
	194	* @dev: USB Host Controller being suspended
a0d4922d	195	* @message: Power Management message describing this state transition
1da177e4	196	*
a0d4922d	197	* Store this function in the HCD's struct pci_driver as .suspend.
1da177e4	198	*/
34bbe4c1	199	int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t message)
1da177e4	200	{
a0d4922d	201	struct usb_hcd *hcd = pci_get_drvdata(dev);
1da177e4	202	int retval = 0;
a0d4922d	203	int wake, w;
1da177e4	204
5f827ea3 DB	205	/* Root hub suspend should have stopped all downstream traffic,
	206	* and all bus master traffic. And done so for both the interface
	207	* and the stub usb_device (which we check here). But maybe it
	208	* didn't; writing sysfs power/state files ignores such rules...
	209	*
	210	* We must ignore the FREEZE vs SUSPEND distinction here, because
	211	* otherwise the swsusp will save (and restore) garbage state.
	212	*/
f3fd77cd	213	if (!(hcd->state == HC_STATE_SUSPENDED \|\|
a0d4922d AS	214	hcd->state == HC_STATE_HALT)) {
	215	dev_warn(&dev->dev, "Root hub is not suspended\n");
	216	retval = -EBUSY;
	217	goto done;
	218	}
	219
	220	/* We might already be suspended (runtime PM -- not yet written) */
	221	if (dev->current_state != PCI_D0)
	222	goto done;
5f827ea3	223
7be7d741 AS	224	if (hcd->driver->pci_suspend) {
	225	retval = hcd->driver->pci_suspend(hcd, message);
	226	suspend_report_result(hcd->driver->pci_suspend, retval);
02669492	227	if (retval)
5f827ea3	228	goto done;
5f827ea3 DB	229	}
5f827ea3 DB	230
a0d4922d	231	synchronize_irq(dev->irq);
c6053ecf	232
a0d4922d AS	233	/* Don't fail on error to enable wakeup. We rely on pci code
	234	* to reject requests the hardware can't implement, rather
	235	* than coding the same thing.
1da177e4	236	*/
a0d4922d AS	237	wake = (hcd->state == HC_STATE_SUSPENDED &&
	238	device_may_wakeup(&dev->dev));
	239	w = pci_wake_from_d3(dev, wake);
	240	if (w < 0)
	241	wake = w;
	242	dev_dbg(&dev->dev, "wakeup: %d\n", wake);
1da177e4	243
5f827ea3 DB	244	/* Downstream ports from this root hub should already be quiesced, so
	245	* there will be no DMA activity. Now we can shut down the upstream
	246	* link (except maybe for PME# resume signaling) and enter some PCI
	247	* low power state, if the hardware allows.
1da177e4	248	*/
a0d4922d AS	249	pci_disable_device(dev);
	250	done:
	251	return retval;
	252	}
	253	EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend);
1da177e4	254
a0d4922d AS	255	/**
	256	* usb_hcd_pci_suspend_late - suspend a PCI-based HCD after IRQs are disabled
	257	* @dev: USB Host Controller being suspended
	258	* @message: Power Management message describing this state transition
	259	*
	260	* Store this function in the HCD's struct pci_driver as .suspend_late.
	261	*/
	262	int usb_hcd_pci_suspend_late(struct pci_dev *dev, pm_message_t message)
	263	{
	264	int retval = 0;
	265	int has_pci_pm;
1da177e4	266
a0d4922d AS	267	/* We might already be suspended (runtime PM -- not yet written) */
	268	if (dev->current_state != PCI_D0)
	269	goto done;
269954e5	270
a0d4922d AS	271	pci_save_state(dev);
	272
	273	/* Don't change state if we don't need to */
	274	if (message.event == PM_EVENT_FREEZE \|\|
	275	message.event == PM_EVENT_PRETHAW) {
	276	dev_dbg(&dev->dev, "--> no state change\n");
	277	goto done;
	278	}
	279
	280	has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
	281	if (!has_pci_pm) {
	282	dev_dbg(&dev->dev, "--> PCI D0 legacy\n");
	283	} else {
1da177e4	284
c6053ecf DB	285	/* NOTE: dev->current_state becomes nonzero only here, and
	286	* only for devices that support PCI PM. Also, exiting
	287	* PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
	288	* some device state (e.g. as part of clock reinit).
1da177e4	289	*/
34bbe4c1	290	retval = pci_set_power_state(dev, PCI_D3hot);
02669492	291	suspend_report_result(pci_set_power_state, retval);
1da177e4	292	if (retval == 0) {
a0d4922d	293	dev_dbg(&dev->dev, "--> PCI D3\n");
5f827ea3	294	} else {
34bbe4c1	295	dev_dbg(&dev->dev, "PCI D3 suspend fail, %d\n",
c6053ecf	296	retval);
a0d4922d	297	pci_restore_state(dev);
1da177e4	298	}
1da177e4 LT	299	}
1da177e4 LT	300
21b1861f	301	#ifdef CONFIG_PPC_PMAC
a0d4922d	302	if (retval == 0) {
21b1861f	303	/* Disable ASIC clocks for USB */
e8222502	304	if (machine_is(powermac)) {
21b1861f DB	305	struct device_node *of_node;
21b1861f DB	306
34bbe4c1	307	of_node = pci_device_to_OF_node(dev);
21b1861f DB	308	if (of_node)
	309	pmac_call_feature(PMAC_FTR_USB_ENABLE,
	310	of_node, 0, 0);
	311	}
21b1861f	312	}
a0d4922d	313	#endif
21b1861f	314
a0d4922d	315	done:
1da177e4 LT	316	return retval;
1da177e4 LT	317	}
a0d4922d	318	EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend_late);
1da177e4 LT	319
1da177e4 LT	320	/**
a0d4922d	321	* usb_hcd_pci_resume_early - resume a PCI-based HCD before IRQs are enabled
1da177e4 LT	322	* @dev: USB Host Controller being resumed
1da177e4 LT	323	*
a0d4922d	324	* Store this function in the HCD's struct pci_driver as .resume_early.
1da177e4	325	*/
a0d4922d	326	int usb_hcd_pci_resume_early(struct pci_dev *dev)
1da177e4	327	{
a0d4922d AS	328	int retval = 0;
a0d4922d AS	329	pci_power_t state = dev->current_state;
1da177e4	330
21b1861f DB	331	#ifdef CONFIG_PPC_PMAC
21b1861f DB	332	/* Reenable ASIC clocks for USB */
e8222502	333	if (machine_is(powermac)) {
21b1861f DB	334	struct device_node *of_node;
21b1861f DB	335
34bbe4c1	336	of_node = pci_device_to_OF_node(dev);
21b1861f	337	if (of_node)
34bbe4c1	338	pmac_call_feature(PMAC_FTR_USB_ENABLE,
21b1861f DB	339	of_node, 0, 1);
	340	}
	341	#endif
	342
c6053ecf DB	343	/* NOTE: chip docs cover clean "real suspend" cases (what Linux
	344	* calls "standby", "suspend to RAM", and so on). There are also
	345	* dirty cases when swsusp fakes a suspend in "shutdown" mode.
	346	*/
a0d4922d	347	if (state != PCI_D0) {
c6053ecf DB	348	#ifdef DEBUG
	349	int pci_pm;
	350	u16 pmcr;
	351
	352	pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
	353	pci_read_config_word(dev, pci_pm + PCI_PM_CTRL, &pmcr);
	354	pmcr &= PCI_PM_CTRL_STATE_MASK;
	355	if (pmcr) {
	356	/* Clean case: power to USB and to HC registers was
	357	* maintained; remote wakeup is easy.
	358	*/
a0d4922d	359	dev_dbg(&dev->dev, "resume from PCI D%d\n", pmcr);
c6053ecf DB	360	} else {
	361	/* Clean: HC lost Vcc power, D0 uninitialized
	362	* + Vaux may have preserved port and transceiver
	363	* state ... for remote wakeup from D3cold
	364	* + or not; HCD must reinit + re-enumerate
	365	*
	366	* Dirty: D0 semi-initialized cases with swsusp
	367	* + after BIOS init
	368	* + after Linux init (HCD statically linked)
	369	*/
a0d4922d AS	370	dev_dbg(&dev->dev, "resume from previous PCI D%d\n",
a0d4922d AS	371	state);
c6053ecf DB	372	}
c6053ecf DB	373	#endif
a0d4922d AS	374
a0d4922d AS	375	retval = pci_set_power_state(dev, PCI_D0);
c6053ecf DB	376	} else {
c6053ecf DB	377	/* Same basic cases: clean (powered/not), dirty */
a0d4922d AS	378	dev_dbg(&dev->dev, "PCI legacy resume\n");
	379	}
	380
	381	if (retval < 0)
	382	dev_err(&dev->dev, "can't resume: %d\n", retval);
	383	else
	384	pci_restore_state(dev);
	385
	386	return retval;
	387	}
	388	EXPORT_SYMBOL_GPL(usb_hcd_pci_resume_early);
	389
	390	/**
	391	* usb_hcd_pci_resume - power management resume of a PCI-based HCD
	392	* @dev: USB Host Controller being resumed
	393	*
	394	* Store this function in the HCD's struct pci_driver as .resume.
	395	*/
	396	int usb_hcd_pci_resume(struct pci_dev *dev)
	397	{
	398	struct usb_hcd *hcd;
	399	int retval;
	400
	401	hcd = pci_get_drvdata(dev);
	402	if (hcd->state != HC_STATE_SUSPENDED) {
	403	dev_dbg(hcd->self.controller,
	404	"can't resume, not suspended!\n");
	405	return 0;
c6053ecf DB	406	}
c6053ecf DB	407
34bbe4c1	408	retval = pci_enable_device(dev);
c6053ecf	409	if (retval < 0) {
a0d4922d AS	410	dev_err(&dev->dev, "can't re-enable after resume, %d!\n",
a0d4922d AS	411	retval);
c6053ecf DB	412	return retval;
c6053ecf DB	413	}
a0d4922d	414
34bbe4c1	415	pci_set_master(dev);
a0d4922d AS	416
	417	/* yes, ignore this result too... */
	418	(void) pci_wake_from_d3(dev, 0);
c6053ecf	419
8de98402	420	clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
1da177e4	421
7be7d741 AS	422	if (hcd->driver->pci_resume) {
7be7d741 AS	423	retval = hcd->driver->pci_resume(hcd);
5f827ea3	424	if (retval) {
34bbe4c1	425	dev_err(hcd->self.controller,
5f827ea3	426	"PCI post-resume error %d!\n", retval);
34bbe4c1	427	usb_hc_died(hcd);
5f827ea3	428	}
1da177e4	429	}
1da177e4 LT	430	return retval;
1da177e4 LT	431	}
782e70c6	432	EXPORT_SYMBOL_GPL(usb_hcd_pci_resume);
1da177e4 LT	433
	434	#endif /* CONFIG_PM */
	435
64a21d02 AG	436	/**
	437	* usb_hcd_pci_shutdown - shutdown host controller
	438	* @dev: USB Host Controller being shutdown
	439	*/
34bbe4c1	440	void usb_hcd_pci_shutdown(struct pci_dev *dev)
64a21d02 AG	441	{
	442	struct usb_hcd *hcd;
	443
	444	hcd = pci_get_drvdata(dev);
	445	if (!hcd)
	446	return;
	447
	448	if (hcd->driver->shutdown)
	449	hcd->driver->shutdown(hcd);
	450	}
782e70c6	451	EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);
1da177e4	452