[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 <acpi/acpi.h>
#include <acpi/acnamesp.h>
#include <acpi/acresrc.h>
#include <acpi/acpi_bus.h>

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

static u32 ctrlset_buf[3] = {0, 0, 0};
static u32 global_ctrlsets = 0;
static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};

static acpi_status  
acpi_query_osc (
	acpi_handle	handle,
	u32		level,
	void		*context,
	void		**retval )
{
	acpi_status		status;
	struct acpi_object_list	input;
	union acpi_object 	in_params[4];
	struct acpi_buffer	output = {ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object 	*out_obj;
	u32			osc_dw0;
	acpi_status *ret_status = (acpi_status *)retval;

	
	/* Setting up input parameters */
	input.count = 4;
	input.pointer = in_params;
	in_params[0].type 		= ACPI_TYPE_BUFFER;
	in_params[0].buffer.length 	= 16;
	in_params[0].buffer.pointer	= OSC_UUID;
	in_params[1].type 		= ACPI_TYPE_INTEGER;
	in_params[1].integer.value 	= 1;
	in_params[2].type 		= ACPI_TYPE_INTEGER;
	in_params[2].integer.value	= 3;
	in_params[3].type		= ACPI_TYPE_BUFFER;
	in_params[3].buffer.length 	= 12;
	in_params[3].buffer.pointer 	= (u8 *)context;

	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
	if (ACPI_FAILURE (status)) {
		*ret_status = status;
		return status;
	}
	out_obj = output.pointer;

	if (out_obj->type != ACPI_TYPE_BUFFER) {
		printk(KERN_DEBUG  
			"Evaluate _OSC returns wrong type\n");
		status = AE_TYPE;
		goto query_osc_out;
	}
	osc_dw0 = *((u32 *) out_obj->buffer.pointer);
	if (osc_dw0) {
		if (osc_dw0 & OSC_REQUEST_ERROR)
			printk(KERN_DEBUG "_OSC request fails\n"); 
		if (osc_dw0 & OSC_INVALID_UUID_ERROR)
			printk(KERN_DEBUG "_OSC invalid UUID\n"); 
		if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
			printk(KERN_DEBUG "_OSC invalid revision\n"); 
		if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
			/* Update Global Control Set */
			global_ctrlsets = *((u32 *)(out_obj->buffer.pointer+8));
			status = AE_OK;
			goto query_osc_out;
		}
		status = AE_ERROR;
		goto query_osc_out;
	}

	/* Update Global Control Set */
	global_ctrlsets = *((u32 *)(out_obj->buffer.pointer + 8));
	status = AE_OK;

query_osc_out:
	kfree(output.pointer);
	*ret_status = status;
	return status;
}


static acpi_status  
acpi_run_osc (
	acpi_handle	handle,
	void		*context)
{
	acpi_status		status;
	struct acpi_object_list	input;
	union acpi_object 	in_params[4];
	struct acpi_buffer	output = {ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object 	*out_obj;
	u32			osc_dw0;

	/* Setting up input parameters */
	input.count = 4;
	input.pointer = in_params;
	in_params[0].type 		= ACPI_TYPE_BUFFER;
	in_params[0].buffer.length 	= 16;
	in_params[0].buffer.pointer	= OSC_UUID;
	in_params[1].type 		= ACPI_TYPE_INTEGER;
	in_params[1].integer.value 	= 1;
	in_params[2].type 		= ACPI_TYPE_INTEGER;
	in_params[2].integer.value	= 3;
	in_params[3].type		= ACPI_TYPE_BUFFER;
	in_params[3].buffer.length 	= 12;
	in_params[3].buffer.pointer 	= (u8 *)context;

	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
	if (ACPI_FAILURE (status))
		return status;

	out_obj = output.pointer;
	if (out_obj->type != ACPI_TYPE_BUFFER) {
		printk(KERN_DEBUG  
			"Evaluate _OSC returns wrong type\n");
		status = AE_TYPE;
		goto run_osc_out;
	}
	osc_dw0 = *((u32 *) out_obj->buffer.pointer);
	if (osc_dw0) {
		if (osc_dw0 & OSC_REQUEST_ERROR)
			printk(KERN_DEBUG "_OSC request fails\n"); 
		if (osc_dw0 & OSC_INVALID_UUID_ERROR)
			printk(KERN_DEBUG "_OSC invalid UUID\n"); 
		if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
			printk(KERN_DEBUG "_OSC invalid revision\n"); 
		if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
			printk(KERN_DEBUG "_OSC FW not grant req. control\n");
			status = AE_SUPPORT;
			goto run_osc_out;
		}
		status = AE_ERROR;
		goto run_osc_out;
	}
	status = AE_OK;

run_osc_out:
	kfree(output.pointer);
	return status;
}

/**
 * __pci_osc_support_set - register OS support to Firmware
 * @flags: OS support bits
 * @hid: hardware ID
 *
 * Update OS support fields and doing a _OSC Query to obtain an update
 * from Firmware on supported control bits.
 **/
acpi_status __pci_osc_support_set(u32 flags, const char *hid)
{
	u32 temp;
	acpi_status retval;

	if (!(flags & OSC_SUPPORT_MASKS)) {
		return AE_TYPE;
	}
	ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS);

	/* do _OSC query for all possible controls */
	temp = ctrlset_buf[OSC_CONTROL_TYPE];
	ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
	ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
	acpi_get_devices(hid,
			acpi_query_osc,
			ctrlset_buf,
			(void **) &retval );
	ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE;
	ctrlset_buf[OSC_CONTROL_TYPE] = temp;
	if (ACPI_FAILURE(retval)) {
		/* no osc support at all */
		ctrlset_buf[OSC_SUPPORT_TYPE] = 0;
	}
	return AE_OK;
}

/**
 * pci_osc_control_set - commit requested control to Firmware
 * @handle: acpi_handle for the target ACPI object
 * @flags: driver's requested control bits
 *
 * Attempt to take control from Firmware on requested control bits.
 **/
acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
{
	acpi_status	status;
	u32		ctrlset;

	ctrlset = (flags & OSC_CONTROL_MASKS);
	if (!ctrlset) {
		return AE_TYPE;
	}
	if (ctrlset_buf[OSC_SUPPORT_TYPE] && 
	 	((global_ctrlsets & ctrlset) != ctrlset)) {
		return AE_SUPPORT;
	}
	ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset;
	status = acpi_run_osc(handle, ctrlset_buf);
	if (ACPI_FAILURE (status)) {
		ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
	}
	
	return status;
}
EXPORT_SYMBOL(pci_osc_control_set);

#ifdef CONFIG_ACPI_SLEEP
/*
 * _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,
	pm_message_t state)
{
	int acpi_state;

	acpi_state = acpi_pm_device_sleep_state(&pdev->dev,
		device_may_wakeup(&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;
}
#endif

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
	};

	if (!handle)
		return -ENODEV;
	/* If the ACPI device has _EJ0, ignore the device */
	if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
		return 0;

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


/* 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->bus_id, "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 & BAF_MSI_NOT_SUPPORTED) {
		printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
		pci_no_msi();
	}
	ret = register_acpi_bus_type(&acpi_pci_bus);
	if (ret)
		return 0;
#ifdef	CONFIG_ACPI_SLEEP
	platform_pci_choose_state = acpi_pci_choose_state;
#endif
	platform_pci_set_power_state = acpi_pci_set_power_state;
	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>
	14	#include <acpi/acpi.h>
	15	#include <acpi/acnamesp.h>
	16	#include <acpi/acresrc.h>
	17	#include <acpi/acpi_bus.h>
	18
	19	#include <linux/pci-acpi.h>
0f64474b	20	#include "pci.h"
1da177e4 LT	21
	22	static u32 ctrlset_buf[3] = {0, 0, 0};
	23	static u32 global_ctrlsets = 0;
bc56b9e0	24	static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
1da177e4 LT	25
	26	static acpi_status
	27	acpi_query_osc (
	28	acpi_handle handle,
	29	u32 level,
	30	void *context,
	31	void **retval )
	32	{
	33	acpi_status status;
	34	struct acpi_object_list input;
	35	union acpi_object in_params[4];
593ee207 KA	36	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
593ee207 KA	37	union acpi_object *out_obj;
1da177e4	38	u32 osc_dw0;
0dcb2b7e	39	acpi_status ret_status = (acpi_status )retval;
1da177e4	40
1da177e4 LT	41
	42	/* Setting up input parameters */
	43	input.count = 4;
	44	input.pointer = in_params;
	45	in_params[0].type = ACPI_TYPE_BUFFER;
	46	in_params[0].buffer.length = 16;
	47	in_params[0].buffer.pointer = OSC_UUID;
	48	in_params[1].type = ACPI_TYPE_INTEGER;
	49	in_params[1].integer.value = 1;
	50	in_params[2].type = ACPI_TYPE_INTEGER;
	51	in_params[2].integer.value = 3;
	52	in_params[3].type = ACPI_TYPE_BUFFER;
	53	in_params[3].buffer.length = 12;
	54	in_params[3].buffer.pointer = (u8 *)context;
	55
	56	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
	57	if (ACPI_FAILURE (status)) {
0dcb2b7e	58	*ret_status = status;
1da177e4 LT	59	return status;
1da177e4 LT	60	}
593ee207 KA	61	out_obj = output.pointer;
	62
	63	if (out_obj->type != ACPI_TYPE_BUFFER) {
1da177e4 LT	64	printk(KERN_DEBUG
1da177e4 LT	65	"Evaluate _OSC returns wrong type\n");
593ee207 KA	66	status = AE_TYPE;
593ee207 KA	67	goto query_osc_out;
1da177e4	68	}
593ee207	69	osc_dw0 = ((u32 ) out_obj->buffer.pointer);
1da177e4 LT	70	if (osc_dw0) {
	71	if (osc_dw0 & OSC_REQUEST_ERROR)
	72	printk(KERN_DEBUG "_OSC request fails\n");
	73	if (osc_dw0 & OSC_INVALID_UUID_ERROR)
	74	printk(KERN_DEBUG "_OSC invalid UUID\n");
	75	if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
	76	printk(KERN_DEBUG "_OSC invalid revision\n");
	77	if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
	78	/* Update Global Control Set */
593ee207 KA	79	global_ctrlsets = ((u32 )(out_obj->buffer.pointer+8));
	80	status = AE_OK;
	81	goto query_osc_out;
1da177e4	82	}
593ee207 KA	83	status = AE_ERROR;
593ee207 KA	84	goto query_osc_out;
1da177e4 LT	85	}
	86
	87	/* Update Global Control Set */
593ee207 KA	88	global_ctrlsets = ((u32 )(out_obj->buffer.pointer + 8));
	89	status = AE_OK;
	90
	91	query_osc_out:
	92	kfree(output.pointer);
0dcb2b7e	93	*ret_status = status;
593ee207	94	return status;
1da177e4 LT	95	}
	96
	97
	98	static acpi_status
	99	acpi_run_osc (
	100	acpi_handle handle,
427bf532	101	void *context)
1da177e4 LT	102	{
	103	acpi_status status;
	104	struct acpi_object_list input;
	105	union acpi_object in_params[4];
593ee207 KA	106	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
593ee207 KA	107	union acpi_object *out_obj;
1da177e4 LT	108	u32 osc_dw0;
1da177e4 LT	109
1da177e4 LT	110	/* Setting up input parameters */
	111	input.count = 4;
	112	input.pointer = in_params;
	113	in_params[0].type = ACPI_TYPE_BUFFER;
	114	in_params[0].buffer.length = 16;
	115	in_params[0].buffer.pointer = OSC_UUID;
	116	in_params[1].type = ACPI_TYPE_INTEGER;
	117	in_params[1].integer.value = 1;
	118	in_params[2].type = ACPI_TYPE_INTEGER;
	119	in_params[2].integer.value = 3;
	120	in_params[3].type = ACPI_TYPE_BUFFER;
	121	in_params[3].buffer.length = 12;
	122	in_params[3].buffer.pointer = (u8 *)context;
	123
	124	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
8d29bfb7	125	if (ACPI_FAILURE (status))
1da177e4	126	return status;
8d29bfb7	127
593ee207 KA	128	out_obj = output.pointer;
593ee207 KA	129	if (out_obj->type != ACPI_TYPE_BUFFER) {
1da177e4 LT	130	printk(KERN_DEBUG
1da177e4 LT	131	"Evaluate _OSC returns wrong type\n");
593ee207 KA	132	status = AE_TYPE;
593ee207 KA	133	goto run_osc_out;
1da177e4	134	}
593ee207	135	osc_dw0 = ((u32 ) out_obj->buffer.pointer);
1da177e4 LT	136	if (osc_dw0) {
	137	if (osc_dw0 & OSC_REQUEST_ERROR)
	138	printk(KERN_DEBUG "_OSC request fails\n");
	139	if (osc_dw0 & OSC_INVALID_UUID_ERROR)
	140	printk(KERN_DEBUG "_OSC invalid UUID\n");
	141	if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
	142	printk(KERN_DEBUG "_OSC invalid revision\n");
	143	if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
	144	printk(KERN_DEBUG "_OSC FW not grant req. control\n");
593ee207 KA	145	status = AE_SUPPORT;
593ee207 KA	146	goto run_osc_out;
1da177e4	147	}
593ee207 KA	148	status = AE_ERROR;
593ee207 KA	149	goto run_osc_out;
1da177e4	150	}
593ee207 KA	151	status = AE_OK;
	152
	153	run_osc_out:
	154	kfree(output.pointer);
	155	return status;
1da177e4 LT	156	}
	157
	158	/**
c2778357	159	* __pci_osc_support_set - register OS support to Firmware
1da177e4	160	* @flags: OS support bits
5958f1a4	161	* @hid: hardware ID
1da177e4 LT	162	*
	163	* Update OS support fields and doing a _OSC Query to obtain an update
	164	* from Firmware on supported control bits.
	165	**/
c2778357	166	acpi_status __pci_osc_support_set(u32 flags, const char *hid)
1da177e4 LT	167	{
1da177e4 LT	168	u32 temp;
0dcb2b7e	169	acpi_status retval;
1da177e4 LT	170
	171	if (!(flags & OSC_SUPPORT_MASKS)) {
	172	return AE_TYPE;
	173	}
	174	ctrlset_buf[OSC_SUPPORT_TYPE] \|= (flags & OSC_SUPPORT_MASKS);
	175
	176	/* do _OSC query for all possible controls */
	177	temp = ctrlset_buf[OSC_CONTROL_TYPE];
	178	ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
	179	ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
c2778357	180	acpi_get_devices(hid,
1da177e4 LT	181	acpi_query_osc,
1da177e4 LT	182	ctrlset_buf,
0dcb2b7e	183	(void **) &retval );
1da177e4 LT	184	ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE;
1da177e4 LT	185	ctrlset_buf[OSC_CONTROL_TYPE] = temp;
0dcb2b7e KCA	186	if (ACPI_FAILURE(retval)) {
	187	/* no osc support at all */
	188	ctrlset_buf[OSC_SUPPORT_TYPE] = 0;
	189	}
1da177e4 LT	190	return AE_OK;
1da177e4 LT	191	}
1da177e4 LT	192
	193	/**
	194	* pci_osc_control_set - commit requested control to Firmware
f366633f	195	* @handle: acpi_handle for the target ACPI object
1da177e4 LT	196	* @flags: driver's requested control bits
	197	*
	198	* Attempt to take control from Firmware on requested control bits.
	199	**/
427bf532	200	acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
1da177e4 LT	201	{
	202	acpi_status status;
	203	u32 ctrlset;
	204
	205	ctrlset = (flags & OSC_CONTROL_MASKS);
	206	if (!ctrlset) {
	207	return AE_TYPE;
	208	}
	209	if (ctrlset_buf[OSC_SUPPORT_TYPE] &&
	210	((global_ctrlsets & ctrlset) != ctrlset)) {
	211	return AE_SUPPORT;
	212	}
	213	ctrlset_buf[OSC_CONTROL_TYPE] \|= ctrlset;
427bf532	214	status = acpi_run_osc(handle, ctrlset_buf);
1da177e4 LT	215	if (ACPI_FAILURE (status)) {
	216	ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
	217	}
	218
	219	return status;
	220	}
	221	EXPORT_SYMBOL(pci_osc_control_set);
84df749f	222
673d5b43	223	#ifdef CONFIG_ACPI_SLEEP
0f64474b DSL	224	/*
	225	* _SxD returns the D-state with the highest power
	226	* (lowest D-state number) supported in the S-state "x".
	227	*
	228	* If the devices does not have a _PRW
	229	* (Power Resources for Wake) supporting system wakeup from "x"
	230	* then the OS is free to choose a lower power (higher number
	231	* D-state) than the return value from _SxD.
	232	*
	233	* But if _PRW is enabled at S-state "x", the OS
	234	* must not choose a power lower than _SxD --
	235	* unless the device has an _SxW method specifying
	236	* the lowest power (highest D-state number) the device
	237	* may enter while still able to wake the system.
	238	*
	239	* ie. depending on global OS policy:
	240	*
	241	* if (_PRW at S-state x)
	242	* choose from highest power _SxD to lowest power _SxW
	243	* else // no _PRW at S-state x
	244	* choose highest power _SxD or any lower power
0f64474b DSL	245	*/
0f64474b DSL	246
ab826ca4 SL	247	static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev,
ab826ca4 SL	248	pm_message_t state)
0f64474b	249	{
ab826ca4	250	int acpi_state;
0f64474b	251
ab826ca4 SL	252	acpi_state = acpi_pm_device_sleep_state(&pdev->dev,
	253	device_may_wakeup(&pdev->dev), NULL);
	254	if (acpi_state < 0)
	255	return PCI_POWER_ERROR;
	256
	257	switch (acpi_state) {
	258	case ACPI_STATE_D0:
	259	return PCI_D0;
	260	case ACPI_STATE_D1:
	261	return PCI_D1;
	262	case ACPI_STATE_D2:
	263	return PCI_D2;
	264	case ACPI_STATE_D3:
	265	return PCI_D3hot;
	266	}
	267	return PCI_POWER_ERROR;
0f64474b	268	}
673d5b43	269	#endif
0f64474b	270
b913100d DSL	271	static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
	272	{
	273	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
10b3dcae	274	acpi_handle tmp;
583c377f DB	275	static const u8 state_conv[] = {
	276	[PCI_D0] = ACPI_STATE_D0,
	277	[PCI_D1] = ACPI_STATE_D1,
	278	[PCI_D2] = ACPI_STATE_D2,
	279	[PCI_D3hot] = ACPI_STATE_D3,
	280	[PCI_D3cold] = ACPI_STATE_D3
b913100d	281	};
b913100d DSL	282
	283	if (!handle)
	284	return -ENODEV;
10b3dcae SL	285	/* If the ACPI device has _EJ0, ignore the device */
	286	if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
	287	return 0;
583c377f DB	288
	289	switch (state) {
	290	case PCI_D0:
	291	case PCI_D1:
	292	case PCI_D2:
	293	case PCI_D3hot:
	294	case PCI_D3cold:
	295	return acpi_bus_set_power(handle, state_conv[state]);
	296	}
	297	return -EINVAL;
b913100d DSL	298	}
	299
	300
84df749f	301	/* ACPI bus type */
9c273b95	302	static int acpi_pci_find_device(struct device dev, acpi_handle handle)
84df749f DSL	303	{
	304	struct pci_dev * pci_dev;
	305	acpi_integer addr;
	306
	307	pci_dev = to_pci_dev(dev);
	308	/* Please ref to ACPI spec for the syntax of _ADR */
	309	addr = (PCI_SLOT(pci_dev->devfn) << 16) \| PCI_FUNC(pci_dev->devfn);
	310	*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
	311	if (!*handle)
	312	return -ENODEV;
	313	return 0;
	314	}
	315
9c273b95	316	static int acpi_pci_find_root_bridge(struct device dev, acpi_handle handle)
84df749f DSL	317	{
	318	int num;
	319	unsigned int seg, bus;
	320
	321	/*
	322	* The string should be the same as root bridge's name
	323	* Please look at 'pci_scan_bus_parented'
	324	*/
	325	num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
	326	if (num != 2)
	327	return -ENODEV;
	328	*handle = acpi_get_pci_rootbridge_handle(seg, bus);
	329	if (!*handle)
	330	return -ENODEV;
	331	return 0;
	332	}
	333
9c273b95	334	static struct acpi_bus_type acpi_pci_bus = {
84df749f	335	.bus = &pci_bus_type,
9c273b95 MK	336	.find_device = acpi_pci_find_device,
9c273b95 MK	337	.find_bridge = acpi_pci_find_root_bridge,
84df749f DSL	338	};
84df749f DSL	339
9c273b95	340	static int __init acpi_pci_init(void)
84df749f DSL	341	{
	342	int ret;
	343
f8993aff SL	344	if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
	345	printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
	346	pci_no_msi();
	347	}
9c273b95	348	ret = register_acpi_bus_type(&acpi_pci_bus);
84df749f DSL	349	if (ret)
84df749f DSL	350	return 0;
673d5b43	351	#ifdef CONFIG_ACPI_SLEEP
0f64474b	352	platform_pci_choose_state = acpi_pci_choose_state;
673d5b43	353	#endif
b913100d	354	platform_pci_set_power_state = acpi_pci_set_power_state;
84df749f DSL	355	return 0;
84df749f DSL	356	}
9c273b95	357	arch_initcall(acpi_pci_init);