[net-next-2.6.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) {
		pci_check_pme_status(pci_dev);
		pm_runtime_resume(&pci_dev->dev);
		pci_wakeup_event(pci_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;
	}
	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) {
		if (!dev->wakeup.run_wake_count++) {
			acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
			acpi_enable_gpe(dev->wakeup.gpe_device,
					dev->wakeup.gpe_number);
		}
	} else if (dev->wakeup.run_wake_count > 0) {
		if (!--dev->wakeup.run_wake_count) {
			acpi_disable_gpe(dev->wakeup.gpe_device,
					 dev->wakeup.gpe_number);
			acpi_disable_wakeup_device_power(dev);
		}
	} else {
		error = -EALREADY;
	}

	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_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) {
	49	pci_check_pme_status(pci_dev);
	50	pm_runtime_resume(&pci_dev->dev);
c125e96f	51	pci_wakeup_event(pci_dev);
b67ea761 RW	52	if (pci_dev->subordinate)
	53	pci_pme_wakeup_bus(pci_dev->subordinate);
	54	}
	55	}
	56
	57	/**
	58	* add_pm_notifier - Register PM notifier for given ACPI device.
	59	* @dev: ACPI device to add the notifier for.
	60	* @context: PCI device or bus to check for PME status if an event is signaled.
	61	*
	62	* NOTE: @dev need not be a run-wake or wake-up device to be a valid source of
	63	* PM wake-up events. For example, wake-up events may be generated for bridges
	64	* if one of the devices below the bridge is signaling PME, even if the bridge
	65	* itself doesn't have a wake-up GPE associated with it.
	66	*/
	67	static acpi_status add_pm_notifier(struct acpi_device *dev,
	68	acpi_notify_handler handler,
	69	void *context)
	70	{
	71	acpi_status status = AE_ALREADY_EXISTS;
	72
	73	mutex_lock(&pci_acpi_pm_notify_mtx);
	74
	75	if (dev->wakeup.flags.notifier_present)
	76	goto out;
	77
	78	status = acpi_install_notify_handler(dev->handle,
	79	ACPI_SYSTEM_NOTIFY,
	80	handler, context);
	81	if (ACPI_FAILURE(status))
	82	goto out;
	83
	84	dev->wakeup.flags.notifier_present = true;
	85
	86	out:
	87	mutex_unlock(&pci_acpi_pm_notify_mtx);
	88	return status;
	89	}
	90
	91	/**
	92	* remove_pm_notifier - Unregister PM notifier from given ACPI device.
	93	* @dev: ACPI device to remove the notifier from.
	94	*/
	95	static acpi_status remove_pm_notifier(struct acpi_device *dev,
	96	acpi_notify_handler handler)
	97	{
	98	acpi_status status = AE_BAD_PARAMETER;
	99
	100	mutex_lock(&pci_acpi_pm_notify_mtx);
	101
	102	if (!dev->wakeup.flags.notifier_present)
	103	goto out;
	104
	105	status = acpi_remove_notify_handler(dev->handle,
	106	ACPI_SYSTEM_NOTIFY,
	107	handler);
	108	if (ACPI_FAILURE(status))
	109	goto out;
	110
	111	dev->wakeup.flags.notifier_present = false;
	112
	113	out:
	114	mutex_unlock(&pci_acpi_pm_notify_mtx);
	115	return status;
116	}
117
118	/**
119	* pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
120	* @dev: ACPI device to add the notifier for.
121	* @pci_bus: PCI bus to walk checking for PME status if an event is signaled.
122	*/
123	acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
124	struct pci_bus *pci_bus)
125	{
126	return add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus);
127	}
128
129	/**
130	* pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier.
131	* @dev: ACPI device to remove the notifier from.
132	*/
133	acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev)
134	{
135	return remove_pm_notifier(dev, pci_acpi_wake_bus);
136	}
137
138	/**
139	* pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
140	* @dev: ACPI device to add the notifier for.
141	* @pci_dev: PCI device to check for the PME status if an event is signaled.
142	*/
143	acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
144	struct pci_dev *pci_dev)
145	{
146	return add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev);
147	}
148
149	/**
150	* pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier.
151	* @dev: ACPI device to remove the notifier from.
152	*/
153	acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
154	{
155	return remove_pm_notifier(dev, pci_acpi_wake_dev);
156	}
157
0f64474b DSL	158	/*
	159	* _SxD returns the D-state with the highest power
	160	* (lowest D-state number) supported in the S-state "x".
	161	*
	162	* If the devices does not have a _PRW
	163	* (Power Resources for Wake) supporting system wakeup from "x"
	164	* then the OS is free to choose a lower power (higher number
	165	* D-state) than the return value from _SxD.
	166	*
	167	* But if _PRW is enabled at S-state "x", the OS
	168	* must not choose a power lower than _SxD --
	169	* unless the device has an _SxW method specifying
	170	* the lowest power (highest D-state number) the device
	171	* may enter while still able to wake the system.
	172	*
	173	* ie. depending on global OS policy:
	174	*
	175	* if (_PRW at S-state x)
	176	* choose from highest power _SxD to lowest power _SxW
	177	* else // no _PRW at S-state x
	178	* choose highest power _SxD or any lower power
0f64474b DSL	179	*/
0f64474b DSL	180
8d2bdf49	181	static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
0f64474b	182	{
ab826ca4	183	int acpi_state;
0f64474b	184
06166780	185	acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
ab826ca4 SL	186	if (acpi_state < 0)
	187	return PCI_POWER_ERROR;
	188
	189	switch (acpi_state) {
	190	case ACPI_STATE_D0:
	191	return PCI_D0;
	192	case ACPI_STATE_D1:
	193	return PCI_D1;
	194	case ACPI_STATE_D2:
	195	return PCI_D2;
	196	case ACPI_STATE_D3:
	197	return PCI_D3hot;
	198	}
	199	return PCI_POWER_ERROR;
0f64474b	200	}
961d9120 RW	201
	202	static bool acpi_pci_power_manageable(struct pci_dev *dev)
	203	{
	204	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
	205
	206	return handle ? acpi_bus_power_manageable(handle) : false;
	207	}
0f64474b	208
b913100d DSL	209	static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
	210	{
	211	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
10b3dcae	212	acpi_handle tmp;
583c377f DB	213	static const u8 state_conv[] = {
	214	[PCI_D0] = ACPI_STATE_D0,
	215	[PCI_D1] = ACPI_STATE_D1,
	216	[PCI_D2] = ACPI_STATE_D2,
	217	[PCI_D3hot] = ACPI_STATE_D3,
	218	[PCI_D3cold] = ACPI_STATE_D3
b913100d	219	};
44e4e66e	220	int error = -EINVAL;
b913100d	221
10b3dcae	222	/* If the ACPI device has _EJ0, ignore the device */
44e4e66e RW	223	if (!handle \|\| ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
44e4e66e RW	224	return -ENODEV;
583c377f DB	225
	226	switch (state) {
	227	case PCI_D0:
	228	case PCI_D1:
	229	case PCI_D2:
	230	case PCI_D3hot:
	231	case PCI_D3cold:
44e4e66e	232	error = acpi_bus_set_power(handle, state_conv[state]);
583c377f	233	}
44e4e66e RW	234
	235	if (!error)
	236	dev_printk(KERN_INFO, &dev->dev,
	237	"power state changed by ACPI to D%d\n", state);
	238
	239	return error;
b913100d DSL	240	}
b913100d DSL	241
eb9d0fe4 RW	242	static bool acpi_pci_can_wakeup(struct pci_dev *dev)
	243	{
	244	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
	245
	246	return handle ? acpi_bus_can_wakeup(handle) : false;
	247	}
	248
0baed8da RW	249	static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
	250	{
	251	while (bus->parent) {
dc1a94ae	252	if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
0baed8da RW	253	return;
	254	bus = bus->parent;
	255	}
	256
	257	/* We have reached the root bus. */
	258	if (bus->bridge)
	259	acpi_pm_device_sleep_wake(bus->bridge, enable);
	260	}
	261
eb9d0fe4 RW	262	static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
eb9d0fe4 RW	263	{
0baed8da RW	264	if (acpi_pci_can_wakeup(dev))
	265	return acpi_pm_device_sleep_wake(&dev->dev, enable);
	266
dc1a94ae	267	acpi_pci_propagate_wakeup_enable(dev->bus, enable);
0baed8da	268	return 0;
eb9d0fe4 RW	269	}
eb9d0fe4 RW	270
b67ea761 RW	271	/**
	272	* acpi_dev_run_wake - Enable/disable wake-up for given device.
	273	* @phys_dev: Device to enable/disable the platform to wake-up the system for.
	274	* @enable: Whether enable or disable the wake-up functionality.
	275	*
	276	* Find the ACPI device object corresponding to @pci_dev and try to
	277	* enable/disable the GPE associated with it.
	278	*/
	279	static int acpi_dev_run_wake(struct device *phys_dev, bool enable)
	280	{
	281	struct acpi_device *dev;
	282	acpi_handle handle;
	283	int error = -ENODEV;
	284
	285	if (!device_run_wake(phys_dev))
	286	return -EINVAL;
	287
	288	handle = DEVICE_ACPI_HANDLE(phys_dev);
	289	if (!handle \|\| ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
	290	dev_dbg(phys_dev, "ACPI handle has no context in %s!\n",
	291	__func__);
	292	return -ENODEV;
	293	}
	294
	295	if (enable) {
	296	if (!dev->wakeup.run_wake_count++) {
	297	acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
	298	acpi_enable_gpe(dev->wakeup.gpe_device,
a44061aa	299	dev->wakeup.gpe_number);
b67ea761 RW	300	}
	301	} else if (dev->wakeup.run_wake_count > 0) {
	302	if (!--dev->wakeup.run_wake_count) {
	303	acpi_disable_gpe(dev->wakeup.gpe_device,
a44061aa	304	dev->wakeup.gpe_number);
b67ea761 RW	305	acpi_disable_wakeup_device_power(dev);
	306	}
	307	} else {
	308	error = -EALREADY;
	309	}
	310
	311	return error;
	312	}
	313
	314	static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
	315	{
	316	while (bus->parent) {
	317	struct pci_dev *bridge = bus->self;
	318
	319	if (bridge->pme_interrupt)
	320	return;
	321	if (!acpi_dev_run_wake(&bridge->dev, enable))
	322	return;
	323	bus = bus->parent;
	324	}
	325
	326	/* We have reached the root bus. */
	327	if (bus->bridge)
	328	acpi_dev_run_wake(bus->bridge, enable);
	329	}
	330
	331	static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
	332	{
	333	if (dev->pme_interrupt)
	334	return 0;
	335
	336	if (!acpi_dev_run_wake(&dev->dev, enable))
	337	return 0;
	338
	339	acpi_pci_propagate_run_wake(dev->bus, enable);
	340	return 0;
	341	}
	342
961d9120 RW	343	static struct pci_platform_pm_ops acpi_pci_platform_pm = {
	344	.is_manageable = acpi_pci_power_manageable,
	345	.set_state = acpi_pci_set_power_state,
	346	.choose_state = acpi_pci_choose_state,
eb9d0fe4 RW	347	.can_wakeup = acpi_pci_can_wakeup,
eb9d0fe4 RW	348	.sleep_wake = acpi_pci_sleep_wake,
b67ea761	349	.run_wake = acpi_pci_run_wake,
961d9120	350	};
b913100d	351
84df749f	352	/* ACPI bus type */
9c273b95	353	static int acpi_pci_find_device(struct device dev, acpi_handle handle)
84df749f DSL	354	{
84df749f DSL	355	struct pci_dev * pci_dev;
439913ff	356	u64 addr;
84df749f DSL	357
	358	pci_dev = to_pci_dev(dev);
	359	/* Please ref to ACPI spec for the syntax of _ADR */
	360	addr = (PCI_SLOT(pci_dev->devfn) << 16) \| PCI_FUNC(pci_dev->devfn);
	361	*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
	362	if (!*handle)
	363	return -ENODEV;
	364	return 0;
	365	}
	366
9c273b95	367	static int acpi_pci_find_root_bridge(struct device dev, acpi_handle handle)
84df749f DSL	368	{
	369	int num;
	370	unsigned int seg, bus;
	371
	372	/*
	373	* The string should be the same as root bridge's name
	374	* Please look at 'pci_scan_bus_parented'
	375	*/
1a927133	376	num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
84df749f DSL	377	if (num != 2)
	378	return -ENODEV;
	379	*handle = acpi_get_pci_rootbridge_handle(seg, bus);
	380	if (!*handle)
	381	return -ENODEV;
	382	return 0;
	383	}
	384
9c273b95	385	static struct acpi_bus_type acpi_pci_bus = {
84df749f	386	.bus = &pci_bus_type,
9c273b95 MK	387	.find_device = acpi_pci_find_device,
9c273b95 MK	388	.find_bridge = acpi_pci_find_root_bridge,
84df749f DSL	389	};
84df749f DSL	390
9c273b95	391	static int __init acpi_pci_init(void)
84df749f DSL	392	{
	393	int ret;
	394
993958fe	395	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
f8993aff SL	396	printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
	397	pci_no_msi();
	398	}
5fde244d	399
993958fe	400	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
5fde244d SL	401	printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
	402	pcie_no_aspm();
	403	}
	404
9c273b95	405	ret = register_acpi_bus_type(&acpi_pci_bus);
84df749f DSL	406	if (ret)
84df749f DSL	407	return 0;
961d9120	408	pci_set_platform_pm(&acpi_pci_platform_pm);
84df749f DSL	409	return 0;
84df749f DSL	410	}
9c273b95	411	arch_initcall(acpi_pci_init);