[deliverable/linux.git] / drivers / pci / pci-acpi.c

/*
 * File:	pci-acpi.c
 * Purpose:	Provide PCI support in ACPI
 *
 * Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
 * Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
 * Copyright (C) 2004 Intel Corp.
 */

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/pci-aspm.h>
#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>

#include <linux/pci-acpi.h>
#include <linux/pm_runtime.h>
#include "pci.h"

static DEFINE_MUTEX(pci_acpi_pm_notify_mtx);

/**
 * pci_acpi_wake_bus - Wake-up notification handler for root buses.
 * @handle: ACPI handle of a device the notification is for.
 * @event: Type of the signaled event.
 * @context: PCI root bus to wake up devices on.
 */
static void pci_acpi_wake_bus(acpi_handle handle, u32 event, void *context)
{
	struct pci_bus *pci_bus = context;

	if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_bus)
		pci_pme_wakeup_bus(pci_bus);
}

/**
 * pci_acpi_wake_dev - Wake-up notification handler for PCI devices.
 * @handle: ACPI handle of a device the notification is for.
 * @event: Type of the signaled event.
 * @context: PCI device object to wake up.
 */
static void pci_acpi_wake_dev(acpi_handle handle, u32 event, void *context)
{
	struct pci_dev *pci_dev = context;

	if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_dev) {
		if (pci_dev->pme_poll)
			pci_dev->pme_poll = false;

		pci_wakeup_event(pci_dev);
		pci_check_pme_status(pci_dev);
		pm_runtime_resume(&pci_dev->dev);
		if (pci_dev->subordinate)
			pci_pme_wakeup_bus(pci_dev->subordinate);
	}
}

/**
 * add_pm_notifier - Register PM notifier for given ACPI device.
 * @dev: ACPI device to add the notifier for.
 * @context: PCI device or bus to check for PME status if an event is signaled.
 *
 * NOTE: @dev need not be a run-wake or wake-up device to be a valid source of
 * PM wake-up events.  For example, wake-up events may be generated for bridges
 * if one of the devices below the bridge is signaling PME, even if the bridge
 * itself doesn't have a wake-up GPE associated with it.
 */
static acpi_status add_pm_notifier(struct acpi_device *dev,
				   acpi_notify_handler handler,
				   void *context)
{
	acpi_status status = AE_ALREADY_EXISTS;

	mutex_lock(&pci_acpi_pm_notify_mtx);

	if (dev->wakeup.flags.notifier_present)
		goto out;

	status = acpi_install_notify_handler(dev->handle,
					     ACPI_SYSTEM_NOTIFY,
					     handler, context);
	if (ACPI_FAILURE(status))
		goto out;

	dev->wakeup.flags.notifier_present = true;

 out:
	mutex_unlock(&pci_acpi_pm_notify_mtx);
	return status;
}

/**
 * remove_pm_notifier - Unregister PM notifier from given ACPI device.
 * @dev: ACPI device to remove the notifier from.
 */
static acpi_status remove_pm_notifier(struct acpi_device *dev,
				      acpi_notify_handler handler)
{
	acpi_status status = AE_BAD_PARAMETER;

	mutex_lock(&pci_acpi_pm_notify_mtx);

	if (!dev->wakeup.flags.notifier_present)
		goto out;

	status = acpi_remove_notify_handler(dev->handle,
					    ACPI_SYSTEM_NOTIFY,
					    handler);
	if (ACPI_FAILURE(status))
		goto out;

	dev->wakeup.flags.notifier_present = false;

 out:
	mutex_unlock(&pci_acpi_pm_notify_mtx);
	return status;
}

/**
 * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
 * @dev: ACPI device to add the notifier for.
 * @pci_bus: PCI bus to walk checking for PME status if an event is signaled.
 */
acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
					 struct pci_bus *pci_bus)
{
	return add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus);
}

/**
 * pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier.
 * @dev: ACPI device to remove the notifier from.
 */
acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev)
{
	return remove_pm_notifier(dev, pci_acpi_wake_bus);
}

/**
 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
 * @dev: ACPI device to add the notifier for.
 * @pci_dev: PCI device to check for the PME status if an event is signaled.
 */
acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
				     struct pci_dev *pci_dev)
{
	return add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev);
}

/**
 * pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier.
 * @dev: ACPI device to remove the notifier from.
 */
acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
{
	return remove_pm_notifier(dev, pci_acpi_wake_dev);
}

/*
 * _SxD returns the D-state with the highest power
 * (lowest D-state number) supported in the S-state "x".
 *
 * If the devices does not have a _PRW
 * (Power Resources for Wake) supporting system wakeup from "x"
 * then the OS is free to choose a lower power (higher number
 * D-state) than the return value from _SxD.
 *
 * But if _PRW is enabled at S-state "x", the OS
 * must not choose a power lower than _SxD --
 * unless the device has an _SxW method specifying
 * the lowest power (highest D-state number) the device
 * may enter while still able to wake the system.
 *
 * ie. depending on global OS policy:
 *
 * if (_PRW at S-state x)
 *	choose from highest power _SxD to lowest power _SxW
 * else // no _PRW at S-state x
 * 	choose highest power _SxD or any lower power
 */

static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
{
	int acpi_state;

	acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
	if (acpi_state < 0)
		return PCI_POWER_ERROR;

	switch (acpi_state) {
	case ACPI_STATE_D0:
		return PCI_D0;
	case ACPI_STATE_D1:
		return PCI_D1;
	case ACPI_STATE_D2:
		return PCI_D2;
	case ACPI_STATE_D3:
		return PCI_D3hot;
	case ACPI_STATE_D3_COLD:
		return PCI_D3cold;
	}
	return PCI_POWER_ERROR;
}

static bool acpi_pci_power_manageable(struct pci_dev *dev)
{
	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);

	return handle ? acpi_bus_power_manageable(handle) : false;
}

static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
{
	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
	acpi_handle tmp;
	static const u8 state_conv[] = {
		[PCI_D0] = ACPI_STATE_D0,
		[PCI_D1] = ACPI_STATE_D1,
		[PCI_D2] = ACPI_STATE_D2,
		[PCI_D3hot] = ACPI_STATE_D3,
		[PCI_D3cold] = ACPI_STATE_D3
	};
	int error = -EINVAL;

	/* If the ACPI device has _EJ0, ignore the device */
	if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
		return -ENODEV;

	switch (state) {
	case PCI_D0:
	case PCI_D1:
	case PCI_D2:
	case PCI_D3hot:
	case PCI_D3cold:
		error = acpi_bus_set_power(handle, state_conv[state]);
	}

	if (!error)
		dev_printk(KERN_INFO, &dev->dev,
				"power state changed by ACPI to D%d\n", state);

	return error;
}

static bool acpi_pci_can_wakeup(struct pci_dev *dev)
{
	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);

	return handle ? acpi_bus_can_wakeup(handle) : false;
}

static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
{
	while (bus->parent) {
		if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
			return;
		bus = bus->parent;
	}

	/* We have reached the root bus. */
	if (bus->bridge)
		acpi_pm_device_sleep_wake(bus->bridge, enable);
}

static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
{
	if (acpi_pci_can_wakeup(dev))
		return acpi_pm_device_sleep_wake(&dev->dev, enable);

	acpi_pci_propagate_wakeup_enable(dev->bus, enable);
	return 0;
}

/**
 * acpi_dev_run_wake - Enable/disable wake-up for given device.
 * @phys_dev: Device to enable/disable the platform to wake-up the system for.
 * @enable: Whether enable or disable the wake-up functionality.
 *
 * Find the ACPI device object corresponding to @pci_dev and try to
 * enable/disable the GPE associated with it.
 */
static int acpi_dev_run_wake(struct device *phys_dev, bool enable)
{
	struct acpi_device *dev;
	acpi_handle handle;
	int error = -ENODEV;

	if (!device_run_wake(phys_dev))
		return -EINVAL;

	handle = DEVICE_ACPI_HANDLE(phys_dev);
	if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
		dev_dbg(phys_dev, "ACPI handle has no context in %s!\n",
			__func__);
		return -ENODEV;
	}

	if (enable) {
		acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
		acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
	} else {
		acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
		acpi_disable_wakeup_device_power(dev);
	}

	return error;
}

static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
{
	while (bus->parent) {
		struct pci_dev *bridge = bus->self;

		if (bridge->pme_interrupt)
			return;
		if (!acpi_dev_run_wake(&bridge->dev, enable))
			return;
		bus = bus->parent;
	}

	/* We have reached the root bus. */
	if (bus->bridge)
		acpi_dev_run_wake(bus->bridge, enable);
}

static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
{
	if (dev->pme_interrupt)
		return 0;

	if (!acpi_dev_run_wake(&dev->dev, enable))
		return 0;

	acpi_pci_propagate_run_wake(dev->bus, enable);
	return 0;
}

static struct pci_platform_pm_ops acpi_pci_platform_pm = {
	.is_manageable = acpi_pci_power_manageable,
	.set_state = acpi_pci_set_power_state,
	.choose_state = acpi_pci_choose_state,
	.can_wakeup = acpi_pci_can_wakeup,
	.sleep_wake = acpi_pci_sleep_wake,
	.run_wake = acpi_pci_run_wake,
};

/* ACPI bus type */
static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
{
	struct pci_dev * pci_dev;
	u64	addr;

	pci_dev = to_pci_dev(dev);
	/* Please ref to ACPI spec for the syntax of _ADR */
	addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
	*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
	if (!*handle)
		return -ENODEV;
	return 0;
}

static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
{
	int num;
	unsigned int seg, bus;

	/*
	 * The string should be the same as root bridge's name
	 * Please look at 'pci_scan_bus_parented'
	 */
	num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
	if (num != 2)
		return -ENODEV;
	*handle = acpi_get_pci_rootbridge_handle(seg, bus);
	if (!*handle)
		return -ENODEV;
	return 0;
}

static struct acpi_bus_type acpi_pci_bus = {
	.bus = &pci_bus_type,
	.find_device = acpi_pci_find_device,
	.find_bridge = acpi_pci_find_root_bridge,
};

static int __init acpi_pci_init(void)
{
	int ret;

	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
		printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
		pci_no_msi();
	}

	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
		printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
		pcie_clear_aspm();
		pcie_no_aspm();
	}

	ret = register_acpi_bus_type(&acpi_pci_bus);
	if (ret)
		return 0;
	pci_set_platform_pm(&acpi_pci_platform_pm);
	return 0;
}
arch_initcall(acpi_pci_init);
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* File: pci-acpi.c
a406d9e6	3	* Purpose: Provide PCI support in ACPI
1da177e4	4	*
84df749f DSL	5	* Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
	6	* Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
	7	* Copyright (C) 2004 Intel Corp.
1da177e4 LT	8	*/
	9
	10	#include <linux/delay.h>
	11	#include <linux/init.h>
	12	#include <linux/pci.h>
	13	#include <linux/module.h>
5fde244d	14	#include <linux/pci-aspm.h>
1da177e4	15	#include <acpi/acpi.h>
1da177e4 LT	16	#include <acpi/acpi_bus.h>
	17
	18	#include <linux/pci-acpi.h>
b67ea761	19	#include <linux/pm_runtime.h>
0f64474b	20	#include "pci.h"
1da177e4	21
b67ea761 RW	22	static DEFINE_MUTEX(pci_acpi_pm_notify_mtx);
	23
	24	/**
	25	* pci_acpi_wake_bus - Wake-up notification handler for root buses.
	26	* @handle: ACPI handle of a device the notification is for.
	27	* @event: Type of the signaled event.
	28	* @context: PCI root bus to wake up devices on.
	29	*/
	30	static void pci_acpi_wake_bus(acpi_handle handle, u32 event, void *context)
	31	{
	32	struct pci_bus *pci_bus = context;
	33
	34	if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_bus)
	35	pci_pme_wakeup_bus(pci_bus);
	36	}
	37
	38	/**
	39	* pci_acpi_wake_dev - Wake-up notification handler for PCI devices.
	40	* @handle: ACPI handle of a device the notification is for.
	41	* @event: Type of the signaled event.
	42	* @context: PCI device object to wake up.
	43	*/
	44	static void pci_acpi_wake_dev(acpi_handle handle, u32 event, void *context)
	45	{
	46	struct pci_dev *pci_dev = context;
	47
	48	if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_dev) {
379021d5 RW	49	if (pci_dev->pme_poll)
	50	pci_dev->pme_poll = false;
	51
0f953bf6	52	pci_wakeup_event(pci_dev);
b67ea761 RW	53	pci_check_pme_status(pci_dev);
	54	pm_runtime_resume(&pci_dev->dev);
	55	if (pci_dev->subordinate)
	56	pci_pme_wakeup_bus(pci_dev->subordinate);
	57	}
	58	}
	59
	60	/**
	61	* add_pm_notifier - Register PM notifier for given ACPI device.
	62	* @dev: ACPI device to add the notifier for.
	63	* @context: PCI device or bus to check for PME status if an event is signaled.
	64	*
	65	* NOTE: @dev need not be a run-wake or wake-up device to be a valid source of
	66	* PM wake-up events. For example, wake-up events may be generated for bridges
	67	* if one of the devices below the bridge is signaling PME, even if the bridge
	68	* itself doesn't have a wake-up GPE associated with it.
	69	*/
	70	static acpi_status add_pm_notifier(struct acpi_device *dev,
	71	acpi_notify_handler handler,
	72	void *context)
	73	{
	74	acpi_status status = AE_ALREADY_EXISTS;
	75
	76	mutex_lock(&pci_acpi_pm_notify_mtx);
	77
	78	if (dev->wakeup.flags.notifier_present)
	79	goto out;
	80
	81	status = acpi_install_notify_handler(dev->handle,
	82	ACPI_SYSTEM_NOTIFY,
	83	handler, context);
	84	if (ACPI_FAILURE(status))
	85	goto out;
	86
	87	dev->wakeup.flags.notifier_present = true;
	88
	89	out:
	90	mutex_unlock(&pci_acpi_pm_notify_mtx);
	91	return status;
	92	}
	93
	94	/**
	95	* remove_pm_notifier - Unregister PM notifier from given ACPI device.
	96	* @dev: ACPI device to remove the notifier from.
	97	*/
	98	static acpi_status remove_pm_notifier(struct acpi_device *dev,
	99	acpi_notify_handler handler)
	100	{
	101	acpi_status status = AE_BAD_PARAMETER;
	102
	103	mutex_lock(&pci_acpi_pm_notify_mtx);
	104
	105	if (!dev->wakeup.flags.notifier_present)
	106	goto out;
	107
	108	status = acpi_remove_notify_handler(dev->handle,
	109	ACPI_SYSTEM_NOTIFY,
	110	handler);
	111	if (ACPI_FAILURE(status))
	112	goto out;
	113
	114	dev->wakeup.flags.notifier_present = false;
	115
	116	out:
117	mutex_unlock(&pci_acpi_pm_notify_mtx);
118	return status;
119	}
120
121	/**
122	* pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
123	* @dev: ACPI device to add the notifier for.
124	* @pci_bus: PCI bus to walk checking for PME status if an event is signaled.
125	*/
126	acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
127	struct pci_bus *pci_bus)
128	{
129	return add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus);
130	}
131
132	/**
133	* pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier.
134	* @dev: ACPI device to remove the notifier from.
135	*/
136	acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev)
137	{
138	return remove_pm_notifier(dev, pci_acpi_wake_bus);
139	}
140
141	/**
142	* pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
143	* @dev: ACPI device to add the notifier for.
144	* @pci_dev: PCI device to check for the PME status if an event is signaled.
145	*/
146	acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
147	struct pci_dev *pci_dev)
148	{
149	return add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev);
150	}
151
152	/**
153	* pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier.
154	* @dev: ACPI device to remove the notifier from.
155	*/
156	acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
157	{
158	return remove_pm_notifier(dev, pci_acpi_wake_dev);
159	}
160
0f64474b DSL	161	/*
	162	* _SxD returns the D-state with the highest power
	163	* (lowest D-state number) supported in the S-state "x".
	164	*
	165	* If the devices does not have a _PRW
	166	* (Power Resources for Wake) supporting system wakeup from "x"
	167	* then the OS is free to choose a lower power (higher number
	168	* D-state) than the return value from _SxD.
	169	*
	170	* But if _PRW is enabled at S-state "x", the OS
	171	* must not choose a power lower than _SxD --
	172	* unless the device has an _SxW method specifying
	173	* the lowest power (highest D-state number) the device
	174	* may enter while still able to wake the system.
	175	*
	176	* ie. depending on global OS policy:
	177	*
	178	* if (_PRW at S-state x)
	179	* choose from highest power _SxD to lowest power _SxW
	180	* else // no _PRW at S-state x
	181	* choose highest power _SxD or any lower power
0f64474b DSL	182	*/
0f64474b DSL	183
8d2bdf49	184	static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
0f64474b	185	{
ab826ca4	186	int acpi_state;
0f64474b	187
06166780	188	acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
ab826ca4 SL	189	if (acpi_state < 0)
	190	return PCI_POWER_ERROR;
	191
	192	switch (acpi_state) {
	193	case ACPI_STATE_D0:
	194	return PCI_D0;
	195	case ACPI_STATE_D1:
	196	return PCI_D1;
	197	case ACPI_STATE_D2:
	198	return PCI_D2;
	199	case ACPI_STATE_D3:
	200	return PCI_D3hot;
28c2103d LM	201	case ACPI_STATE_D3_COLD:
28c2103d LM	202	return PCI_D3cold;
ab826ca4 SL	203	}
ab826ca4 SL	204	return PCI_POWER_ERROR;
0f64474b	205	}
961d9120 RW	206
	207	static bool acpi_pci_power_manageable(struct pci_dev *dev)
	208	{
	209	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
	210
	211	return handle ? acpi_bus_power_manageable(handle) : false;
	212	}
0f64474b	213
b913100d DSL	214	static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
	215	{
	216	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
10b3dcae	217	acpi_handle tmp;
583c377f DB	218	static const u8 state_conv[] = {
	219	[PCI_D0] = ACPI_STATE_D0,
	220	[PCI_D1] = ACPI_STATE_D1,
	221	[PCI_D2] = ACPI_STATE_D2,
	222	[PCI_D3hot] = ACPI_STATE_D3,
	223	[PCI_D3cold] = ACPI_STATE_D3
b913100d	224	};
44e4e66e	225	int error = -EINVAL;
b913100d	226
10b3dcae	227	/* If the ACPI device has _EJ0, ignore the device */
44e4e66e RW	228	if (!handle \|\| ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
44e4e66e RW	229	return -ENODEV;
583c377f DB	230
	231	switch (state) {
	232	case PCI_D0:
	233	case PCI_D1:
	234	case PCI_D2:
	235	case PCI_D3hot:
	236	case PCI_D3cold:
44e4e66e	237	error = acpi_bus_set_power(handle, state_conv[state]);
583c377f	238	}
44e4e66e RW	239
	240	if (!error)
	241	dev_printk(KERN_INFO, &dev->dev,
	242	"power state changed by ACPI to D%d\n", state);
	243
	244	return error;
b913100d DSL	245	}
b913100d DSL	246
eb9d0fe4 RW	247	static bool acpi_pci_can_wakeup(struct pci_dev *dev)
	248	{
	249	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
	250
	251	return handle ? acpi_bus_can_wakeup(handle) : false;
	252	}
	253
0baed8da RW	254	static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
	255	{
	256	while (bus->parent) {
dc1a94ae	257	if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
0baed8da RW	258	return;
	259	bus = bus->parent;
	260	}
	261
	262	/* We have reached the root bus. */
	263	if (bus->bridge)
	264	acpi_pm_device_sleep_wake(bus->bridge, enable);
	265	}
	266
eb9d0fe4 RW	267	static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
eb9d0fe4 RW	268	{
0baed8da RW	269	if (acpi_pci_can_wakeup(dev))
	270	return acpi_pm_device_sleep_wake(&dev->dev, enable);
	271
dc1a94ae	272	acpi_pci_propagate_wakeup_enable(dev->bus, enable);
0baed8da	273	return 0;
eb9d0fe4 RW	274	}
eb9d0fe4 RW	275
b67ea761 RW	276	/**
	277	* acpi_dev_run_wake - Enable/disable wake-up for given device.
	278	* @phys_dev: Device to enable/disable the platform to wake-up the system for.
	279	* @enable: Whether enable or disable the wake-up functionality.
	280	*
	281	* Find the ACPI device object corresponding to @pci_dev and try to
	282	* enable/disable the GPE associated with it.
	283	*/
	284	static int acpi_dev_run_wake(struct device *phys_dev, bool enable)
	285	{
	286	struct acpi_device *dev;
	287	acpi_handle handle;
	288	int error = -ENODEV;
	289
	290	if (!device_run_wake(phys_dev))
	291	return -EINVAL;
	292
	293	handle = DEVICE_ACPI_HANDLE(phys_dev);
	294	if (!handle \|\| ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
	295	dev_dbg(phys_dev, "ACPI handle has no context in %s!\n",
	296	__func__);
	297	return -ENODEV;
	298	}
	299
	300	if (enable) {
51907267 RW	301	acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
51907267 RW	302	acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
b67ea761	303	} else {
51907267 RW	304	acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
51907267 RW	305	acpi_disable_wakeup_device_power(dev);
b67ea761 RW	306	}
	307
	308	return error;
	309	}
	310
	311	static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
	312	{
	313	while (bus->parent) {
	314	struct pci_dev *bridge = bus->self;
	315
	316	if (bridge->pme_interrupt)
	317	return;
	318	if (!acpi_dev_run_wake(&bridge->dev, enable))
	319	return;
	320	bus = bus->parent;
	321	}
	322
	323	/* We have reached the root bus. */
	324	if (bus->bridge)
	325	acpi_dev_run_wake(bus->bridge, enable);
	326	}
	327
	328	static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
	329	{
	330	if (dev->pme_interrupt)
	331	return 0;
	332
	333	if (!acpi_dev_run_wake(&dev->dev, enable))
	334	return 0;
	335
	336	acpi_pci_propagate_run_wake(dev->bus, enable);
	337	return 0;
	338	}
	339
961d9120 RW	340	static struct pci_platform_pm_ops acpi_pci_platform_pm = {
	341	.is_manageable = acpi_pci_power_manageable,
	342	.set_state = acpi_pci_set_power_state,
	343	.choose_state = acpi_pci_choose_state,
eb9d0fe4 RW	344	.can_wakeup = acpi_pci_can_wakeup,
eb9d0fe4 RW	345	.sleep_wake = acpi_pci_sleep_wake,
b67ea761	346	.run_wake = acpi_pci_run_wake,
961d9120	347	};
b913100d	348
84df749f	349	/* ACPI bus type */
9c273b95	350	static int acpi_pci_find_device(struct device dev, acpi_handle handle)
84df749f DSL	351	{
84df749f DSL	352	struct pci_dev * pci_dev;
439913ff	353	u64 addr;
84df749f DSL	354
	355	pci_dev = to_pci_dev(dev);
	356	/* Please ref to ACPI spec for the syntax of _ADR */
	357	addr = (PCI_SLOT(pci_dev->devfn) << 16) \| PCI_FUNC(pci_dev->devfn);
	358	*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
	359	if (!*handle)
	360	return -ENODEV;
	361	return 0;
	362	}
	363
9c273b95	364	static int acpi_pci_find_root_bridge(struct device dev, acpi_handle handle)
84df749f DSL	365	{
	366	int num;
	367	unsigned int seg, bus;
	368
	369	/*
	370	* The string should be the same as root bridge's name
	371	* Please look at 'pci_scan_bus_parented'
	372	*/
1a927133	373	num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
84df749f DSL	374	if (num != 2)
	375	return -ENODEV;
	376	*handle = acpi_get_pci_rootbridge_handle(seg, bus);
	377	if (!*handle)
	378	return -ENODEV;
	379	return 0;
	380	}
	381
9c273b95	382	static struct acpi_bus_type acpi_pci_bus = {
84df749f	383	.bus = &pci_bus_type,
9c273b95 MK	384	.find_device = acpi_pci_find_device,
9c273b95 MK	385	.find_bridge = acpi_pci_find_root_bridge,
84df749f DSL	386	};
84df749f DSL	387
9c273b95	388	static int __init acpi_pci_init(void)
84df749f DSL	389	{
	390	int ret;
	391
993958fe	392	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
f8993aff SL	393	printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
	394	pci_no_msi();
	395	}
5fde244d	396
993958fe	397	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
5fde244d	398	printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
2f671e2d	399	pcie_clear_aspm();
5fde244d SL	400	pcie_no_aspm();
	401	}
	402
9c273b95	403	ret = register_acpi_bus_type(&acpi_pci_bus);
84df749f DSL	404	if (ret)
84df749f DSL	405	return 0;
961d9120	406	pci_set_platform_pm(&acpi_pci_platform_pm);
84df749f DSL	407	return 0;
84df749f DSL	408	}
9c273b95	409	arch_initcall(acpi_pci_init);