[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)
		return;

	if (pci_dev->current_state == PCI_D3cold) {
		pci_wakeup_event(pci_dev);
		pm_runtime_resume(&pci_dev->dev);
		return;
	}

	if (!pci_dev->pm_cap || !pci_dev->pme_support
	     || pci_check_pme_status(pci_dev)) {
		if (pci_dev->pme_poll)
			pci_dev->pme_poll = false;

		pci_wakeup_event(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);
}

phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
{
	acpi_status status = AE_NOT_EXIST;
	unsigned long long mcfg_addr;

	if (handle)
		status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
					       NULL, &mcfg_addr);
	if (ACPI_FAILURE(status))
		return 0;

	return (phys_addr_t)mcfg_addr;
}

/*
 * _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, d_max;

	if (pdev->no_d3cold)
		d_max = ACPI_STATE_D3_HOT;
	else
		d_max = ACPI_STATE_D3_COLD;
	acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
	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_HOT:
		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_info(&dev->dev, "power state changed by ACPI to %s\n",
			 pci_power_name(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;
}

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_pm_device_run_wake(&bridge->dev, enable))
			return;
		bus = bus->parent;
	}

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

static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
{
	/*
	 * Per PCI Express Base Specification Revision 2.0 section
	 * 5.3.3.2 Link Wakeup, platform support is needed for D3cold
	 * waking up to power on the main link even if there is PME
	 * support for D3cold
	 */
	if (dev->pme_interrupt && !dev->runtime_d3cold)
		return 0;

	if (!acpi_pm_device_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_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
a424948d RW	48	if (event != ACPI_NOTIFY_DEVICE_WAKE \|\| !pci_dev)
	49	return;
	50
448bd857 HY	51	if (pci_dev->current_state == PCI_D3cold) {
	52	pci_wakeup_event(pci_dev);
	53	pm_runtime_resume(&pci_dev->dev);
	54	return;
	55	}
	56
a424948d RW	57	if (!pci_dev->pm_cap \|\| !pci_dev->pme_support
a424948d RW	58	\|\| pci_check_pme_status(pci_dev)) {
379021d5 RW	59	if (pci_dev->pme_poll)
	60	pci_dev->pme_poll = false;
	61
0f953bf6	62	pci_wakeup_event(pci_dev);
b67ea761	63	pm_runtime_resume(&pci_dev->dev);
b67ea761	64	}
a424948d RW	65
	66	if (pci_dev->subordinate)
	67	pci_pme_wakeup_bus(pci_dev->subordinate);
b67ea761 RW	68	}
	69
	70	/**
	71	* add_pm_notifier - Register PM notifier for given ACPI device.
	72	* @dev: ACPI device to add the notifier for.
	73	* @context: PCI device or bus to check for PME status if an event is signaled.
	74	*
	75	* NOTE: @dev need not be a run-wake or wake-up device to be a valid source of
	76	* PM wake-up events. For example, wake-up events may be generated for bridges
	77	* if one of the devices below the bridge is signaling PME, even if the bridge
	78	* itself doesn't have a wake-up GPE associated with it.
	79	*/
	80	static acpi_status add_pm_notifier(struct acpi_device *dev,
	81	acpi_notify_handler handler,
	82	void *context)
	83	{
	84	acpi_status status = AE_ALREADY_EXISTS;
	85
	86	mutex_lock(&pci_acpi_pm_notify_mtx);
	87
	88	if (dev->wakeup.flags.notifier_present)
	89	goto out;
	90
	91	status = acpi_install_notify_handler(dev->handle,
	92	ACPI_SYSTEM_NOTIFY,
	93	handler, context);
	94	if (ACPI_FAILURE(status))
	95	goto out;
	96
	97	dev->wakeup.flags.notifier_present = true;
	98
	99	out:
	100	mutex_unlock(&pci_acpi_pm_notify_mtx);
	101	return status;
	102	}
	103
	104	/**
	105	* remove_pm_notifier - Unregister PM notifier from given ACPI device.
	106	* @dev: ACPI device to remove the notifier from.
	107	*/
	108	static acpi_status remove_pm_notifier(struct acpi_device *dev,
	109	acpi_notify_handler handler)
	110	{
	111	acpi_status status = AE_BAD_PARAMETER;
	112
	113	mutex_lock(&pci_acpi_pm_notify_mtx);
	114
	115	if (!dev->wakeup.flags.notifier_present)
	116	goto out;
	117
	118	status = acpi_remove_notify_handler(dev->handle,
	119	ACPI_SYSTEM_NOTIFY,
	120	handler);
	121	if (ACPI_FAILURE(status))
	122	goto out;
	123
	124	dev->wakeup.flags.notifier_present = false;
	125
	126	out:
	127	mutex_unlock(&pci_acpi_pm_notify_mtx);
	128	return status;
	129	}
	130
	131	/**
132	* pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
133	* @dev: ACPI device to add the notifier for.
134	* @pci_bus: PCI bus to walk checking for PME status if an event is signaled.
135	*/
136	acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
137	struct pci_bus *pci_bus)
138	{
139	return add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus);
140	}
141
142	/**
143	* pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier.
144	* @dev: ACPI device to remove the notifier from.
145	*/
146	acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev)
147	{
148	return remove_pm_notifier(dev, pci_acpi_wake_bus);
149	}
150
151	/**
152	* pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
153	* @dev: ACPI device to add the notifier for.
154	* @pci_dev: PCI device to check for the PME status if an event is signaled.
155	*/
156	acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
157	struct pci_dev *pci_dev)
158	{
159	return add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev);
160	}
161
162	/**
163	* pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier.
164	* @dev: ACPI device to remove the notifier from.
165	*/
166	acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
167	{
168	return remove_pm_notifier(dev, pci_acpi_wake_dev);
169	}
170
f4b57a3b JL	171	phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
	172	{
	173	acpi_status status = AE_NOT_EXIST;
	174	unsigned long long mcfg_addr;
	175
	176	if (handle)
	177	status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
	178	NULL, &mcfg_addr);
	179	if (ACPI_FAILURE(status))
	180	return 0;
	181
	182	return (phys_addr_t)mcfg_addr;
	183	}
	184
0f64474b DSL	185	/*
	186	* _SxD returns the D-state with the highest power
	187	* (lowest D-state number) supported in the S-state "x".
	188	*
	189	* If the devices does not have a _PRW
	190	* (Power Resources for Wake) supporting system wakeup from "x"
	191	* then the OS is free to choose a lower power (higher number
	192	* D-state) than the return value from _SxD.
	193	*
	194	* But if _PRW is enabled at S-state "x", the OS
	195	* must not choose a power lower than _SxD --
	196	* unless the device has an _SxW method specifying
	197	* the lowest power (highest D-state number) the device
	198	* may enter while still able to wake the system.
	199	*
	200	* ie. depending on global OS policy:
	201	*
	202	* if (_PRW at S-state x)
	203	* choose from highest power _SxD to lowest power _SxW
	204	* else // no _PRW at S-state x
	205	* choose highest power _SxD or any lower power
0f64474b DSL	206	*/
0f64474b DSL	207
8d2bdf49	208	static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
0f64474b	209	{
448bd857	210	int acpi_state, d_max;
0f64474b	211
448bd857 HY	212	if (pdev->no_d3cold)
	213	d_max = ACPI_STATE_D3_HOT;
	214	else
	215	d_max = ACPI_STATE_D3_COLD;
	216	acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
ab826ca4 SL	217	if (acpi_state < 0)
	218	return PCI_POWER_ERROR;
	219
	220	switch (acpi_state) {
	221	case ACPI_STATE_D0:
	222	return PCI_D0;
	223	case ACPI_STATE_D1:
	224	return PCI_D1;
	225	case ACPI_STATE_D2:
	226	return PCI_D2;
1cc0c998	227	case ACPI_STATE_D3_HOT:
ab826ca4	228	return PCI_D3hot;
28c2103d LM	229	case ACPI_STATE_D3_COLD:
28c2103d LM	230	return PCI_D3cold;
ab826ca4 SL	231	}
ab826ca4 SL	232	return PCI_POWER_ERROR;
0f64474b	233	}
961d9120 RW	234
	235	static bool acpi_pci_power_manageable(struct pci_dev *dev)
	236	{
	237	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
	238
	239	return handle ? acpi_bus_power_manageable(handle) : false;
	240	}
0f64474b	241
b913100d DSL	242	static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
	243	{
	244	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
10b3dcae	245	acpi_handle tmp;
583c377f DB	246	static const u8 state_conv[] = {
	247	[PCI_D0] = ACPI_STATE_D0,
	248	[PCI_D1] = ACPI_STATE_D1,
	249	[PCI_D2] = ACPI_STATE_D2,
5c7dd710	250	[PCI_D3hot] = ACPI_STATE_D3,
583c377f	251	[PCI_D3cold] = ACPI_STATE_D3
b913100d	252	};
44e4e66e	253	int error = -EINVAL;
b913100d	254
10b3dcae	255	/* If the ACPI device has _EJ0, ignore the device */
44e4e66e RW	256	if (!handle \|\| ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
44e4e66e RW	257	return -ENODEV;
583c377f DB	258
	259	switch (state) {
	260	case PCI_D0:
	261	case PCI_D1:
	262	case PCI_D2:
	263	case PCI_D3hot:
	264	case PCI_D3cold:
44e4e66e	265	error = acpi_bus_set_power(handle, state_conv[state]);
583c377f	266	}
44e4e66e RW	267
44e4e66e RW	268	if (!error)
3d0882c0 RW	269	dev_info(&dev->dev, "power state changed by ACPI to %s\n",
3d0882c0 RW	270	pci_power_name(state));
44e4e66e RW	271
44e4e66e RW	272	return error;
b913100d DSL	273	}
b913100d DSL	274
eb9d0fe4 RW	275	static bool acpi_pci_can_wakeup(struct pci_dev *dev)
	276	{
	277	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
	278
	279	return handle ? acpi_bus_can_wakeup(handle) : false;
	280	}
	281
0baed8da RW	282	static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
	283	{
	284	while (bus->parent) {
dc1a94ae	285	if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
0baed8da RW	286	return;
	287	bus = bus->parent;
	288	}
	289
	290	/* We have reached the root bus. */
	291	if (bus->bridge)
	292	acpi_pm_device_sleep_wake(bus->bridge, enable);
	293	}
	294
eb9d0fe4 RW	295	static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
eb9d0fe4 RW	296	{
0baed8da RW	297	if (acpi_pci_can_wakeup(dev))
	298	return acpi_pm_device_sleep_wake(&dev->dev, enable);
	299
dc1a94ae	300	acpi_pci_propagate_wakeup_enable(dev->bus, enable);
0baed8da	301	return 0;
eb9d0fe4 RW	302	}
eb9d0fe4 RW	303
b67ea761 RW	304	static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
	305	{
	306	while (bus->parent) {
	307	struct pci_dev *bridge = bus->self;
	308
	309	if (bridge->pme_interrupt)
	310	return;
b24e5098	311	if (!acpi_pm_device_run_wake(&bridge->dev, enable))
b67ea761 RW	312	return;
	313	bus = bus->parent;
	314	}
	315
	316	/* We have reached the root bus. */
	317	if (bus->bridge)
b24e5098	318	acpi_pm_device_run_wake(bus->bridge, enable);
b67ea761 RW	319	}
	320
	321	static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
	322	{
448bd857 HY	323	/*
	324	* Per PCI Express Base Specification Revision 2.0 section
	325	* 5.3.3.2 Link Wakeup, platform support is needed for D3cold
	326	* waking up to power on the main link even if there is PME
	327	* support for D3cold
	328	*/
	329	if (dev->pme_interrupt && !dev->runtime_d3cold)
b67ea761 RW	330	return 0;
b67ea761 RW	331
b24e5098	332	if (!acpi_pm_device_run_wake(&dev->dev, enable))
b67ea761 RW	333	return 0;
	334
	335	acpi_pci_propagate_run_wake(dev->bus, enable);
	336	return 0;
	337	}
	338
961d9120 RW	339	static struct pci_platform_pm_ops acpi_pci_platform_pm = {
	340	.is_manageable = acpi_pci_power_manageable,
	341	.set_state = acpi_pci_set_power_state,
	342	.choose_state = acpi_pci_choose_state,
eb9d0fe4 RW	343	.can_wakeup = acpi_pci_can_wakeup,
eb9d0fe4 RW	344	.sleep_wake = acpi_pci_sleep_wake,
b67ea761	345	.run_wake = acpi_pci_run_wake,
961d9120	346	};
b913100d	347
84df749f	348	/* ACPI bus type */
9c273b95	349	static int acpi_pci_find_device(struct device dev, acpi_handle handle)
84df749f DSL	350	{
84df749f DSL	351	struct pci_dev * pci_dev;
439913ff	352	u64 addr;
84df749f DSL	353
	354	pci_dev = to_pci_dev(dev);
	355	/* Please ref to ACPI spec for the syntax of _ADR */
	356	addr = (PCI_SLOT(pci_dev->devfn) << 16) \| PCI_FUNC(pci_dev->devfn);
	357	*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
	358	if (!*handle)
	359	return -ENODEV;
	360	return 0;
	361	}
	362
9c273b95	363	static int acpi_pci_find_root_bridge(struct device dev, acpi_handle handle)
84df749f DSL	364	{
	365	int num;
	366	unsigned int seg, bus;
	367
	368	/*
	369	* The string should be the same as root bridge's name
	370	* Please look at 'pci_scan_bus_parented'
	371	*/
1a927133	372	num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
84df749f DSL	373	if (num != 2)
	374	return -ENODEV;
	375	*handle = acpi_get_pci_rootbridge_handle(seg, bus);
	376	if (!*handle)
	377	return -ENODEV;
	378	return 0;
	379	}
	380
9c273b95	381	static struct acpi_bus_type acpi_pci_bus = {
84df749f	382	.bus = &pci_bus_type,
9c273b95 MK	383	.find_device = acpi_pci_find_device,
9c273b95 MK	384	.find_bridge = acpi_pci_find_root_bridge,
84df749f DSL	385	};
84df749f DSL	386
9c273b95	387	static int __init acpi_pci_init(void)
84df749f DSL	388	{
	389	int ret;
	390
993958fe	391	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
f8993aff SL	392	printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
	393	pci_no_msi();
	394	}
5fde244d	395
993958fe	396	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
5fde244d SL	397	printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
	398	pcie_no_aspm();
	399	}
	400
9c273b95	401	ret = register_acpi_bus_type(&acpi_pci_bus);
84df749f DSL	402	if (ret)
84df749f DSL	403	return 0;
961d9120	404	pci_set_platform_pm(&acpi_pci_platform_pm);
84df749f DSL	405	return 0;
84df749f DSL	406	}
9c273b95	407	arch_initcall(acpi_pci_init);