[linux-2.6-block.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 "pci.h"

/*
 * _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;
}

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,
};

/* ACPI bus type */
static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
{
	struct pci_dev * pci_dev;
	acpi_integer	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>
0f64474b	19	#include "pci.h"
1da177e4	20
0f64474b DSL	21	/*
	22	* _SxD returns the D-state with the highest power
	23	* (lowest D-state number) supported in the S-state "x".
	24	*
	25	* If the devices does not have a _PRW
	26	* (Power Resources for Wake) supporting system wakeup from "x"
	27	* then the OS is free to choose a lower power (higher number
	28	* D-state) than the return value from _SxD.
	29	*
	30	* But if _PRW is enabled at S-state "x", the OS
	31	* must not choose a power lower than _SxD --
	32	* unless the device has an _SxW method specifying
	33	* the lowest power (highest D-state number) the device
	34	* may enter while still able to wake the system.
	35	*
	36	* ie. depending on global OS policy:
	37	*
	38	* if (_PRW at S-state x)
	39	* choose from highest power _SxD to lowest power _SxW
	40	* else // no _PRW at S-state x
	41	* choose highest power _SxD or any lower power
0f64474b DSL	42	*/
0f64474b DSL	43
8d2bdf49	44	static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
0f64474b	45	{
ab826ca4	46	int acpi_state;
0f64474b	47
06166780	48	acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
ab826ca4 SL	49	if (acpi_state < 0)
	50	return PCI_POWER_ERROR;
	51
	52	switch (acpi_state) {
	53	case ACPI_STATE_D0:
	54	return PCI_D0;
	55	case ACPI_STATE_D1:
	56	return PCI_D1;
	57	case ACPI_STATE_D2:
	58	return PCI_D2;
	59	case ACPI_STATE_D3:
	60	return PCI_D3hot;
	61	}
	62	return PCI_POWER_ERROR;
0f64474b	63	}
961d9120 RW	64
	65	static bool acpi_pci_power_manageable(struct pci_dev *dev)
	66	{
	67	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
	68
	69	return handle ? acpi_bus_power_manageable(handle) : false;
	70	}
0f64474b	71
b913100d DSL	72	static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
	73	{
	74	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
10b3dcae	75	acpi_handle tmp;
583c377f DB	76	static const u8 state_conv[] = {
	77	[PCI_D0] = ACPI_STATE_D0,
	78	[PCI_D1] = ACPI_STATE_D1,
	79	[PCI_D2] = ACPI_STATE_D2,
	80	[PCI_D3hot] = ACPI_STATE_D3,
	81	[PCI_D3cold] = ACPI_STATE_D3
b913100d	82	};
44e4e66e	83	int error = -EINVAL;
b913100d	84
10b3dcae	85	/* If the ACPI device has _EJ0, ignore the device */
44e4e66e RW	86	if (!handle \|\| ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
44e4e66e RW	87	return -ENODEV;
583c377f DB	88
	89	switch (state) {
	90	case PCI_D0:
	91	case PCI_D1:
	92	case PCI_D2:
	93	case PCI_D3hot:
	94	case PCI_D3cold:
44e4e66e	95	error = acpi_bus_set_power(handle, state_conv[state]);
583c377f	96	}
44e4e66e RW	97
	98	if (!error)
	99	dev_printk(KERN_INFO, &dev->dev,
	100	"power state changed by ACPI to D%d\n", state);
	101
	102	return error;
b913100d DSL	103	}
b913100d DSL	104
eb9d0fe4 RW	105	static bool acpi_pci_can_wakeup(struct pci_dev *dev)
	106	{
	107	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
	108
	109	return handle ? acpi_bus_can_wakeup(handle) : false;
	110	}
	111
0baed8da RW	112	static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
	113	{
	114	while (bus->parent) {
dc1a94ae	115	if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
0baed8da RW	116	return;
	117	bus = bus->parent;
	118	}
	119
	120	/* We have reached the root bus. */
	121	if (bus->bridge)
	122	acpi_pm_device_sleep_wake(bus->bridge, enable);
	123	}
	124
eb9d0fe4 RW	125	static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
eb9d0fe4 RW	126	{
0baed8da RW	127	if (acpi_pci_can_wakeup(dev))
	128	return acpi_pm_device_sleep_wake(&dev->dev, enable);
	129
dc1a94ae	130	acpi_pci_propagate_wakeup_enable(dev->bus, enable);
0baed8da	131	return 0;
eb9d0fe4 RW	132	}
eb9d0fe4 RW	133
961d9120 RW	134	static struct pci_platform_pm_ops acpi_pci_platform_pm = {
	135	.is_manageable = acpi_pci_power_manageable,
	136	.set_state = acpi_pci_set_power_state,
	137	.choose_state = acpi_pci_choose_state,
eb9d0fe4 RW	138	.can_wakeup = acpi_pci_can_wakeup,
eb9d0fe4 RW	139	.sleep_wake = acpi_pci_sleep_wake,
961d9120	140	};
b913100d	141
84df749f	142	/* ACPI bus type */
9c273b95	143	static int acpi_pci_find_device(struct device dev, acpi_handle handle)
84df749f DSL	144	{
	145	struct pci_dev * pci_dev;
	146	acpi_integer addr;
	147
	148	pci_dev = to_pci_dev(dev);
	149	/* Please ref to ACPI spec for the syntax of _ADR */
	150	addr = (PCI_SLOT(pci_dev->devfn) << 16) \| PCI_FUNC(pci_dev->devfn);
	151	*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
	152	if (!*handle)
	153	return -ENODEV;
	154	return 0;
	155	}
	156
9c273b95	157	static int acpi_pci_find_root_bridge(struct device dev, acpi_handle handle)
84df749f DSL	158	{
	159	int num;
	160	unsigned int seg, bus;
	161
	162	/*
	163	* The string should be the same as root bridge's name
	164	* Please look at 'pci_scan_bus_parented'
	165	*/
1a927133	166	num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
84df749f DSL	167	if (num != 2)
	168	return -ENODEV;
	169	*handle = acpi_get_pci_rootbridge_handle(seg, bus);
	170	if (!*handle)
	171	return -ENODEV;
	172	return 0;
	173	}
	174
9c273b95	175	static struct acpi_bus_type acpi_pci_bus = {
84df749f	176	.bus = &pci_bus_type,
9c273b95 MK	177	.find_device = acpi_pci_find_device,
9c273b95 MK	178	.find_bridge = acpi_pci_find_root_bridge,
84df749f DSL	179	};
84df749f DSL	180
9c273b95	181	static int __init acpi_pci_init(void)
84df749f DSL	182	{
	183	int ret;
	184
993958fe	185	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
f8993aff SL	186	printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
	187	pci_no_msi();
	188	}
5fde244d	189
993958fe	190	if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
5fde244d SL	191	printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
	192	pcie_no_aspm();
	193	}
	194
9c273b95	195	ret = register_acpi_bus_type(&acpi_pci_bus);
84df749f DSL	196	if (ret)
84df749f DSL	197	return 0;
961d9120	198	pci_set_platform_pm(&acpi_pci_platform_pm);
84df749f DSL	199	return 0;
84df749f DSL	200	}
9c273b95	201	arch_initcall(acpi_pci_init);