[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"

struct acpi_osc_data {
	acpi_handle handle;
	u32 support_set;
	u32 control_set;
	int is_queried;
	u32 query_result;
	struct list_head sibiling;
};
static LIST_HEAD(acpi_osc_data_list);

struct acpi_osc_args {
	u32 capbuf[3];
	u32 query_result;
};

static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
{
	struct acpi_osc_data *data;

	list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
		if (data->handle == handle)
			return data;
	}
	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return NULL;
	INIT_LIST_HEAD(&data->sibiling);
	data->handle = handle;
	list_add_tail(&data->sibiling, &acpi_osc_data_list);
	return data;
}

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_run_osc(acpi_handle handle,
				struct acpi_osc_args *osc_args)
{
	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, flags = osc_args->capbuf[OSC_QUERY_TYPE];

	/* 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 *)osc_args->capbuf;

	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 out_kfree;
	}
	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) {
			if (flags & OSC_QUERY_ENABLE)
				goto out_success;
			printk(KERN_DEBUG "_OSC FW not grant req. control\n");
			status = AE_SUPPORT;
			goto out_kfree;
		}
		status = AE_ERROR;
		goto out_kfree;
	}
out_success:
	if (flags & OSC_QUERY_ENABLE)
		osc_args->query_result =
			*((u32 *)(out_obj->buffer.pointer + 8));
	status = AE_OK;

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

static acpi_status acpi_query_osc(acpi_handle handle,
				  u32 level, void *context, void **retval)
{
	acpi_status status;
	struct acpi_osc_data *osc_data;
	u32 flags = (unsigned long)context, support_set;
	acpi_handle tmp;
	struct acpi_osc_args osc_args;

	status = acpi_get_handle(handle, "_OSC", &tmp);
	if (ACPI_FAILURE(status))
		return status;

	osc_data = acpi_get_osc_data(handle);
	if (!osc_data) {
		printk(KERN_ERR "acpi osc data array is full\n");
		return AE_ERROR;
	}

	/* do _OSC query for all possible controls */
	support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
	osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
	osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
	osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;

	status = acpi_run_osc(handle, &osc_args);
	if (ACPI_SUCCESS(status)) {
		osc_data->support_set = support_set;
		osc_data->query_result = osc_args.query_result;
		osc_data->is_queried = 1;
	}

	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)
{
	if (!(flags & OSC_SUPPORT_MASKS))
		return AE_TYPE;

	acpi_get_devices(hid, acpi_query_osc,
			 (void *)(unsigned long)flags, NULL);
	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, control_set;
	acpi_handle tmp;
	struct acpi_osc_data *osc_data;
	struct acpi_osc_args osc_args;

	status = acpi_get_handle(handle, "_OSC", &tmp);
	if (ACPI_FAILURE(status))
		return status;

	osc_data = acpi_get_osc_data(handle);
	if (!osc_data) {
		printk(KERN_ERR "acpi osc data array is full\n");
		return AE_ERROR;
	}

	ctrlset = (flags & OSC_CONTROL_MASKS);
	if (!ctrlset)
		return AE_TYPE;

	if (osc_data->is_queried &&
	    ((osc_data->query_result & ctrlset) != ctrlset))
		return AE_SUPPORT;

	control_set = osc_data->control_set | ctrlset;
	osc_args.capbuf[OSC_QUERY_TYPE] = 0;
	osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
	osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
	status = acpi_run_osc(handle, &osc_args);
	if (ACPI_SUCCESS(status))
		osc_data->control_set = control_set;

	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	21
a5d1c879 SL	22	struct acpi_osc_data {
a5d1c879 SL	23	acpi_handle handle;
5e0b9947 KK	24	u32 support_set;
5e0b9947 KK	25	u32 control_set;
681f7d9d	26	int is_queried;
5e0b9947	27	u32 query_result;
a5d1c879 SL	28	struct list_head sibiling;
	29	};
	30	static LIST_HEAD(acpi_osc_data_list);
	31
5e0b9947 KK	32	struct acpi_osc_args {
	33	u32 capbuf[3];
	34	u32 query_result;
	35	};
	36
a5d1c879 SL	37	static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
	38	{
	39	struct acpi_osc_data *data;
	40
	41	list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
	42	if (data->handle == handle)
	43	return data;
	44	}
	45	data = kzalloc(sizeof(*data), GFP_KERNEL);
	46	if (!data)
	47	return NULL;
	48	INIT_LIST_HEAD(&data->sibiling);
	49	data->handle = handle;
	50	list_add_tail(&data->sibiling, &acpi_osc_data_list);
	51	return data;
	52	}
	53
bc56b9e0	54	static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
1da177e4	55
8a7a4faf	56	static acpi_status acpi_run_osc(acpi_handle handle,
5e0b9947	57	struct acpi_osc_args *osc_args)
1da177e4	58	{
8a7a4faf KK	59	acpi_status status;
	60	struct acpi_object_list input;
	61	union acpi_object in_params[4];
	62	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
	63	union acpi_object *out_obj;
5e0b9947	64	u32 osc_dw0, flags = osc_args->capbuf[OSC_QUERY_TYPE];
1da177e4	65
1da177e4 LT	66	/* Setting up input parameters */
	67	input.count = 4;
	68	input.pointer = in_params;
	69	in_params[0].type = ACPI_TYPE_BUFFER;
	70	in_params[0].buffer.length = 16;
	71	in_params[0].buffer.pointer = OSC_UUID;
	72	in_params[1].type = ACPI_TYPE_INTEGER;
	73	in_params[1].integer.value = 1;
	74	in_params[2].type = ACPI_TYPE_INTEGER;
	75	in_params[2].integer.value = 3;
	76	in_params[3].type = ACPI_TYPE_BUFFER;
	77	in_params[3].buffer.length = 12;
5e0b9947	78	in_params[3].buffer.pointer = (u8 *)osc_args->capbuf;
1da177e4 LT	79
1da177e4 LT	80	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
a5d1c879	81	if (ACPI_FAILURE(status))
8a7a4faf	82	return status;
593ee207	83
8a7a4faf	84	out_obj = output.pointer;
593ee207	85	if (out_obj->type != ACPI_TYPE_BUFFER) {
8a7a4faf	86	printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
593ee207	87	status = AE_TYPE;
8a7a4faf	88	goto out_kfree;
1da177e4	89	}
593ee207	90	osc_dw0 = ((u32 ) out_obj->buffer.pointer);
1da177e4 LT	91	if (osc_dw0) {
	92	if (osc_dw0 & OSC_REQUEST_ERROR)
	93	printk(KERN_DEBUG "_OSC request fails\n");
	94	if (osc_dw0 & OSC_INVALID_UUID_ERROR)
	95	printk(KERN_DEBUG "_OSC invalid UUID\n");
	96	if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
	97	printk(KERN_DEBUG "_OSC invalid revision\n");
	98	if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
8a7a4faf KK	99	if (flags & OSC_QUERY_ENABLE)
	100	goto out_success;
	101	printk(KERN_DEBUG "_OSC FW not grant req. control\n");
	102	status = AE_SUPPORT;
	103	goto out_kfree;
1da177e4	104	}
593ee207	105	status = AE_ERROR;
8a7a4faf KK	106	goto out_kfree;
	107	}
	108	out_success:
5e0b9947 KK	109	if (flags & OSC_QUERY_ENABLE)
5e0b9947 KK	110	osc_args->query_result =
8a7a4faf	111	((u32 )(out_obj->buffer.pointer + 8));
593ee207 KA	112	status = AE_OK;
593ee207 KA	113
8a7a4faf	114	out_kfree:
593ee207 KA	115	kfree(output.pointer);
593ee207 KA	116	return status;
1da177e4 LT	117	}
1da177e4 LT	118
8a7a4faf KK	119	static acpi_status acpi_query_osc(acpi_handle handle,
8a7a4faf KK	120	u32 level, void context, void *retval)
1da177e4	121	{
8a7a4faf	122	acpi_status status;
8a7a4faf	123	struct acpi_osc_data *osc_data;
5e0b9947	124	u32 flags = (unsigned long)context, support_set;
8a7a4faf	125	acpi_handle tmp;
5e0b9947	126	struct acpi_osc_args osc_args;
1da177e4	127
8a7a4faf KK	128	status = acpi_get_handle(handle, "_OSC", &tmp);
8a7a4faf KK	129	if (ACPI_FAILURE(status))
1da177e4	130	return status;
8d29bfb7	131
8a7a4faf KK	132	osc_data = acpi_get_osc_data(handle);
	133	if (!osc_data) {
	134	printk(KERN_ERR "acpi osc data array is full\n");
	135	return AE_ERROR;
1da177e4	136	}
8a7a4faf	137
8a7a4faf	138	/* do _OSC query for all possible controls */
5e0b9947 KK	139	support_set = osc_data->support_set \| (flags & OSC_SUPPORT_MASKS);
	140	osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
	141	osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
	142	osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
8a7a4faf	143
5e0b9947	144	status = acpi_run_osc(handle, &osc_args);
5e0b9947 KK	145	if (ACPI_SUCCESS(status)) {
	146	osc_data->support_set = support_set;
	147	osc_data->query_result = osc_args.query_result;
681f7d9d	148	osc_data->is_queried = 1;
1da177e4	149	}
593ee207	150
593ee207	151	return status;
1da177e4 LT	152	}
	153
	154	/**
c2778357	155	* __pci_osc_support_set - register OS support to Firmware
1da177e4	156	* @flags: OS support bits
5958f1a4	157	* @hid: hardware ID
1da177e4 LT	158	*
	159	* Update OS support fields and doing a _OSC Query to obtain an update
	160	* from Firmware on supported control bits.
	161	**/
c2778357	162	acpi_status __pci_osc_support_set(u32 flags, const char *hid)
1da177e4	163	{
c155062d	164	if (!(flags & OSC_SUPPORT_MASKS))
1da177e4	165	return AE_TYPE;
c155062d KK	166
	167	acpi_get_devices(hid, acpi_query_osc,
	168	(void *)(unsigned long)flags, NULL);
1da177e4 LT	169	return AE_OK;
1da177e4 LT	170	}
1da177e4 LT	171
	172	/**
	173	* pci_osc_control_set - commit requested control to Firmware
f366633f	174	* @handle: acpi_handle for the target ACPI object
1da177e4 LT	175	* @flags: driver's requested control bits
	176	*
	177	* Attempt to take control from Firmware on requested control bits.
	178	**/
427bf532	179	acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
1da177e4	180	{
5e0b9947 KK	181	acpi_status status;
5e0b9947 KK	182	u32 ctrlset, control_set;
34a65055 KK	183	acpi_handle tmp;
34a65055 KK	184	struct acpi_osc_data *osc_data;
5e0b9947	185	struct acpi_osc_args osc_args;
34a65055 KK	186
	187	status = acpi_get_handle(handle, "_OSC", &tmp);
	188	if (ACPI_FAILURE(status))
	189	return status;
a5d1c879	190
34a65055	191	osc_data = acpi_get_osc_data(handle);
a5d1c879 SL	192	if (!osc_data) {
	193	printk(KERN_ERR "acpi osc data array is full\n");
	194	return AE_ERROR;
	195	}
1da177e4 LT	196
1da177e4 LT	197	ctrlset = (flags & OSC_CONTROL_MASKS);
5e0b9947	198	if (!ctrlset)
1da177e4	199	return AE_TYPE;
5e0b9947	200
681f7d9d	201	if (osc_data->is_queried &&
5e0b9947	202	((osc_data->query_result & ctrlset) != ctrlset))
1da177e4	203	return AE_SUPPORT;
5e0b9947 KK	204
	205	control_set = osc_data->control_set \| ctrlset;
	206	osc_args.capbuf[OSC_QUERY_TYPE] = 0;
	207	osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
	208	osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
	209	status = acpi_run_osc(handle, &osc_args);
	210	if (ACPI_SUCCESS(status))
	211	osc_data->control_set = control_set;
	212
1da177e4 LT	213	return status;
	214	}
	215	EXPORT_SYMBOL(pci_osc_control_set);
84df749f	216
673d5b43	217	#ifdef CONFIG_ACPI_SLEEP
0f64474b DSL	218	/*
	219	* _SxD returns the D-state with the highest power
	220	* (lowest D-state number) supported in the S-state "x".
	221	*
	222	* If the devices does not have a _PRW
	223	* (Power Resources for Wake) supporting system wakeup from "x"
	224	* then the OS is free to choose a lower power (higher number
	225	* D-state) than the return value from _SxD.
	226	*
	227	* But if _PRW is enabled at S-state "x", the OS
	228	* must not choose a power lower than _SxD --
	229	* unless the device has an _SxW method specifying
	230	* the lowest power (highest D-state number) the device
	231	* may enter while still able to wake the system.
	232	*
	233	* ie. depending on global OS policy:
	234	*
	235	* if (_PRW at S-state x)
	236	* choose from highest power _SxD to lowest power _SxW
	237	* else // no _PRW at S-state x
	238	* choose highest power _SxD or any lower power
0f64474b DSL	239	*/
0f64474b DSL	240
ab826ca4 SL	241	static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev,
ab826ca4 SL	242	pm_message_t state)
0f64474b	243	{
ab826ca4	244	int acpi_state;
0f64474b	245
ab826ca4 SL	246	acpi_state = acpi_pm_device_sleep_state(&pdev->dev,
	247	device_may_wakeup(&pdev->dev), NULL);
	248	if (acpi_state < 0)
	249	return PCI_POWER_ERROR;
	250
	251	switch (acpi_state) {
	252	case ACPI_STATE_D0:
	253	return PCI_D0;
	254	case ACPI_STATE_D1:
	255	return PCI_D1;
	256	case ACPI_STATE_D2:
	257	return PCI_D2;
	258	case ACPI_STATE_D3:
	259	return PCI_D3hot;
	260	}
	261	return PCI_POWER_ERROR;
0f64474b	262	}
673d5b43	263	#endif
0f64474b	264
b913100d DSL	265	static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
	266	{
	267	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
10b3dcae	268	acpi_handle tmp;
583c377f DB	269	static const u8 state_conv[] = {
	270	[PCI_D0] = ACPI_STATE_D0,
	271	[PCI_D1] = ACPI_STATE_D1,
	272	[PCI_D2] = ACPI_STATE_D2,
	273	[PCI_D3hot] = ACPI_STATE_D3,
	274	[PCI_D3cold] = ACPI_STATE_D3
b913100d	275	};
b913100d DSL	276
	277	if (!handle)
	278	return -ENODEV;
10b3dcae SL	279	/* If the ACPI device has _EJ0, ignore the device */
	280	if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
	281	return 0;
583c377f DB	282
	283	switch (state) {
	284	case PCI_D0:
	285	case PCI_D1:
	286	case PCI_D2:
	287	case PCI_D3hot:
	288	case PCI_D3cold:
	289	return acpi_bus_set_power(handle, state_conv[state]);
	290	}
	291	return -EINVAL;
b913100d DSL	292	}
	293
	294
84df749f	295	/* ACPI bus type */
9c273b95	296	static int acpi_pci_find_device(struct device dev, acpi_handle handle)
84df749f DSL	297	{
	298	struct pci_dev * pci_dev;
	299	acpi_integer addr;
	300
	301	pci_dev = to_pci_dev(dev);
	302	/* Please ref to ACPI spec for the syntax of _ADR */
	303	addr = (PCI_SLOT(pci_dev->devfn) << 16) \| PCI_FUNC(pci_dev->devfn);
	304	*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
	305	if (!*handle)
	306	return -ENODEV;
	307	return 0;
	308	}
	309
9c273b95	310	static int acpi_pci_find_root_bridge(struct device dev, acpi_handle handle)
84df749f DSL	311	{
	312	int num;
	313	unsigned int seg, bus;
	314
	315	/*
	316	* The string should be the same as root bridge's name
	317	* Please look at 'pci_scan_bus_parented'
	318	*/
	319	num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
	320	if (num != 2)
	321	return -ENODEV;
	322	*handle = acpi_get_pci_rootbridge_handle(seg, bus);
	323	if (!*handle)
	324	return -ENODEV;
	325	return 0;
	326	}
	327
9c273b95	328	static struct acpi_bus_type acpi_pci_bus = {
84df749f	329	.bus = &pci_bus_type,
9c273b95 MK	330	.find_device = acpi_pci_find_device,
9c273b95 MK	331	.find_bridge = acpi_pci_find_root_bridge,
84df749f DSL	332	};
84df749f DSL	333
9c273b95	334	static int __init acpi_pci_init(void)
84df749f DSL	335	{
	336	int ret;
	337
f8993aff SL	338	if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
	339	printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
	340	pci_no_msi();
	341	}
9c273b95	342	ret = register_acpi_bus_type(&acpi_pci_bus);
84df749f DSL	343	if (ret)
84df749f DSL	344	return 0;
673d5b43	345	#ifdef CONFIG_ACPI_SLEEP
0f64474b	346	platform_pci_choose_state = acpi_pci_choose_state;
673d5b43	347	#endif
b913100d	348	platform_pci_set_power_state = acpi_pci_set_power_state;
84df749f DSL	349	return 0;
84df749f DSL	350	}
9c273b95	351	arch_initcall(acpi_pci_init);