[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/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;
	struct list_head sibiling;
};
static LIST_HEAD(acpi_osc_data_list);

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

static DEFINE_MUTEX(pci_acpi_lock);

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 errors, 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;

	if (!output.length)
		return AE_NULL_OBJECT;

	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;
	}
	/* Need to ignore the bit0 in result code */
	errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
	if (errors) {
		if (errors & OSC_REQUEST_ERROR)
			printk(KERN_DEBUG "_OSC request fails\n"); 
		if (errors & OSC_INVALID_UUID_ERROR)
			printk(KERN_DEBUG "_OSC invalid UUID\n"); 
		if (errors & OSC_INVALID_REVISION_ERROR)
			printk(KERN_DEBUG "_OSC invalid revision\n"); 
		if (errors & 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:
	osc_args->ctrl_result =
		*((u32 *)(out_obj->buffer.pointer + 8));
	status = AE_OK;

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

static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data,
				    u32 *result)
{
	acpi_status status;
	u32 support_set;
	struct acpi_osc_args osc_args;

	/* 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(osc_data->handle, &osc_args);
	if (ACPI_SUCCESS(status)) {
		osc_data->support_set = support_set;
		*result = osc_args.ctrl_result;
	}

	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, dummy;
	acpi_handle tmp;

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

	mutex_lock(&pci_acpi_lock);
	osc_data = acpi_get_osc_data(handle);
	if (!osc_data) {
		printk(KERN_ERR "acpi osc data array is full\n");
		goto out;
	}

	__acpi_query_osc(flags, osc_data, &dummy);
out:
	mutex_unlock(&pci_acpi_lock);
	return AE_OK;
}

/**
 * __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, result;
	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;

	mutex_lock(&pci_acpi_lock);
	osc_data = acpi_get_osc_data(handle);
	if (!osc_data) {
		printk(KERN_ERR "acpi osc data array is full\n");
		status = AE_ERROR;
		goto out;
	}

	ctrlset = (flags & OSC_CONTROL_MASKS);
	if (!ctrlset) {
		status = AE_TYPE;
		goto out;
	}

	status = __acpi_query_osc(osc_data->support_set, osc_data, &result);
	if (ACPI_FAILURE(status))
		goto out;

	if ((result & ctrlset) != ctrlset) {
		status = AE_SUPPORT;
		goto out;
	}

	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;
out:
	mutex_unlock(&pci_acpi_lock);
	return status;
}
EXPORT_SYMBOL(pci_osc_control_set);

/*
 * _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 int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
{
	int error = acpi_pm_device_sleep_wake(&dev->dev, enable);

	if (!error)
		dev_printk(KERN_INFO, &dev->dev,
				"wake-up capability %s by ACPI\n",
				enable ? "enabled" : "disabled");
	return error;
}

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->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();
	}

	if (acpi_gbl_FADT.boot_flags & BAF_PCIE_ASPM_CONTROL) {
		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 LT	15	#include <acpi/acpi.h>
	16	#include <acpi/acnamesp.h>
	17	#include <acpi/acresrc.h>
	18	#include <acpi/acpi_bus.h>
	19
	20	#include <linux/pci-acpi.h>
0f64474b	21	#include "pci.h"
1da177e4	22
a5d1c879 SL	23	struct acpi_osc_data {
a5d1c879 SL	24	acpi_handle handle;
5e0b9947 KK	25	u32 support_set;
5e0b9947 KK	26	u32 control_set;
a5d1c879 SL	27	struct list_head sibiling;
	28	};
	29	static LIST_HEAD(acpi_osc_data_list);
	30
5e0b9947 KK	31	struct acpi_osc_args {
5e0b9947 KK	32	u32 capbuf[3];
adf411b8	33	u32 ctrl_result;
5e0b9947 KK	34	};
5e0b9947 KK	35
9778c14b TI	36	static DEFINE_MUTEX(pci_acpi_lock);
9778c14b TI	37
a5d1c879 SL	38	static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
	39	{
	40	struct acpi_osc_data *data;
	41
	42	list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
	43	if (data->handle == handle)
	44	return data;
	45	}
	46	data = kzalloc(sizeof(*data), GFP_KERNEL);
	47	if (!data)
	48	return NULL;
	49	INIT_LIST_HEAD(&data->sibiling);
	50	data->handle = handle;
	51	list_add_tail(&data->sibiling, &acpi_osc_data_list);
	52	return data;
	53	}
	54
90a57dab KK	55	static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
90a57dab KK	56	0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
1da177e4	57
8a7a4faf	58	static acpi_status acpi_run_osc(acpi_handle handle,
5e0b9947	59	struct acpi_osc_args *osc_args)
1da177e4	60	{
8a7a4faf KK	61	acpi_status status;
	62	struct acpi_object_list input;
	63	union acpi_object in_params[4];
	64	struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
	65	union acpi_object *out_obj;
2485b867	66	u32 errors, flags = osc_args->capbuf[OSC_QUERY_TYPE];
1da177e4	67
1da177e4 LT	68	/* Setting up input parameters */
	69	input.count = 4;
	70	input.pointer = in_params;
	71	in_params[0].type = ACPI_TYPE_BUFFER;
	72	in_params[0].buffer.length = 16;
	73	in_params[0].buffer.pointer = OSC_UUID;
	74	in_params[1].type = ACPI_TYPE_INTEGER;
	75	in_params[1].integer.value = 1;
	76	in_params[2].type = ACPI_TYPE_INTEGER;
	77	in_params[2].integer.value = 3;
	78	in_params[3].type = ACPI_TYPE_BUFFER;
	79	in_params[3].buffer.length = 12;
5e0b9947	80	in_params[3].buffer.pointer = (u8 *)osc_args->capbuf;
1da177e4 LT	81
1da177e4 LT	82	status = acpi_evaluate_object(handle, "_OSC", &input, &output);
a5d1c879	83	if (ACPI_FAILURE(status))
8a7a4faf	84	return status;
593ee207	85
f8123381 RW	86	if (!output.length)
	87	return AE_NULL_OBJECT;
	88
8a7a4faf	89	out_obj = output.pointer;
593ee207	90	if (out_obj->type != ACPI_TYPE_BUFFER) {
8a7a4faf	91	printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
593ee207	92	status = AE_TYPE;
8a7a4faf	93	goto out_kfree;
1da177e4	94	}
2485b867 KK	95	/* Need to ignore the bit0 in result code */
	96	errors = ((u32 )out_obj->buffer.pointer) & ~(1 << 0);
	97	if (errors) {
	98	if (errors & OSC_REQUEST_ERROR)
1da177e4	99	printk(KERN_DEBUG "_OSC request fails\n");
2485b867	100	if (errors & OSC_INVALID_UUID_ERROR)
1da177e4	101	printk(KERN_DEBUG "_OSC invalid UUID\n");
2485b867	102	if (errors & OSC_INVALID_REVISION_ERROR)
1da177e4	103	printk(KERN_DEBUG "_OSC invalid revision\n");
2485b867	104	if (errors & OSC_CAPABILITIES_MASK_ERROR) {
8a7a4faf KK	105	if (flags & OSC_QUERY_ENABLE)
	106	goto out_success;
	107	printk(KERN_DEBUG "_OSC FW not grant req. control\n");
	108	status = AE_SUPPORT;
	109	goto out_kfree;
1da177e4	110	}
593ee207	111	status = AE_ERROR;
8a7a4faf KK	112	goto out_kfree;
	113	}
	114	out_success:
adf411b8 TI	115	osc_args->ctrl_result =
adf411b8 TI	116	((u32 )(out_obj->buffer.pointer + 8));
593ee207 KA	117	status = AE_OK;
593ee207 KA	118
8a7a4faf	119	out_kfree:
593ee207 KA	120	kfree(output.pointer);
593ee207 KA	121	return status;
1da177e4 LT	122	}
1da177e4 LT	123
adf411b8 TI	124	static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data,
adf411b8 TI	125	u32 *result)
4e39432f TI	126	{
	127	acpi_status status;
	128	u32 support_set;
	129	struct acpi_osc_args osc_args;
	130
	131	/* do _OSC query for all possible controls */
	132	support_set = osc_data->support_set \| (flags & OSC_SUPPORT_MASKS);
	133	osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
	134	osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
	135	osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
	136
	137	status = acpi_run_osc(osc_data->handle, &osc_args);
	138	if (ACPI_SUCCESS(status)) {
	139	osc_data->support_set = support_set;
adf411b8	140	*result = osc_args.ctrl_result;
4e39432f TI	141	}
	142
	143	return status;
	144	}
	145
8a7a4faf KK	146	static acpi_status acpi_query_osc(acpi_handle handle,
8a7a4faf KK	147	u32 level, void context, void *retval)
1da177e4	148	{
8a7a4faf	149	acpi_status status;
8a7a4faf	150	struct acpi_osc_data *osc_data;
adf411b8	151	u32 flags = (unsigned long)context, dummy;
8a7a4faf	152	acpi_handle tmp;
1da177e4	153
8a7a4faf KK	154	status = acpi_get_handle(handle, "_OSC", &tmp);
8a7a4faf KK	155	if (ACPI_FAILURE(status))
ab20440c	156	return AE_OK;
8d29bfb7	157
9778c14b	158	mutex_lock(&pci_acpi_lock);
8a7a4faf KK	159	osc_data = acpi_get_osc_data(handle);
	160	if (!osc_data) {
	161	printk(KERN_ERR "acpi osc data array is full\n");
9778c14b	162	goto out;
1da177e4	163	}
8a7a4faf	164
ab20440c	165	__acpi_query_osc(flags, osc_data, &dummy);
9778c14b TI	166	out:
9778c14b TI	167	mutex_unlock(&pci_acpi_lock);
ab20440c	168	return AE_OK;
1da177e4 LT	169	}
	170
	171	/**
c2778357	172	* __pci_osc_support_set - register OS support to Firmware
1da177e4	173	* @flags: OS support bits
5958f1a4	174	* @hid: hardware ID
1da177e4 LT	175	*
	176	* Update OS support fields and doing a _OSC Query to obtain an update
	177	* from Firmware on supported control bits.
	178	**/
c2778357	179	acpi_status __pci_osc_support_set(u32 flags, const char *hid)
1da177e4	180	{
c155062d	181	if (!(flags & OSC_SUPPORT_MASKS))
1da177e4	182	return AE_TYPE;
c155062d KK	183
	184	acpi_get_devices(hid, acpi_query_osc,
	185	(void *)(unsigned long)flags, NULL);
1da177e4 LT	186	return AE_OK;
1da177e4 LT	187	}
1da177e4 LT	188
	189	/**
	190	* pci_osc_control_set - commit requested control to Firmware
f366633f	191	* @handle: acpi_handle for the target ACPI object
1da177e4 LT	192	* @flags: driver's requested control bits
	193	*
	194	* Attempt to take control from Firmware on requested control bits.
	195	**/
427bf532	196	acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
1da177e4	197	{
5e0b9947	198	acpi_status status;
adf411b8	199	u32 ctrlset, control_set, result;
34a65055 KK	200	acpi_handle tmp;
34a65055 KK	201	struct acpi_osc_data *osc_data;
5e0b9947	202	struct acpi_osc_args osc_args;
34a65055 KK	203
	204	status = acpi_get_handle(handle, "_OSC", &tmp);
	205	if (ACPI_FAILURE(status))
	206	return status;
a5d1c879	207
9778c14b	208	mutex_lock(&pci_acpi_lock);
34a65055	209	osc_data = acpi_get_osc_data(handle);
a5d1c879 SL	210	if (!osc_data) {
a5d1c879 SL	211	printk(KERN_ERR "acpi osc data array is full\n");
9778c14b TI	212	status = AE_ERROR;
9778c14b TI	213	goto out;
a5d1c879	214	}
1da177e4 LT	215
1da177e4 LT	216	ctrlset = (flags & OSC_CONTROL_MASKS);
9778c14b TI	217	if (!ctrlset) {
	218	status = AE_TYPE;
	219	goto out;
	220	}
5e0b9947	221
adf411b8 TI	222	status = __acpi_query_osc(osc_data->support_set, osc_data, &result);
	223	if (ACPI_FAILURE(status))
	224	goto out;
4e39432f	225
adf411b8	226	if ((result & ctrlset) != ctrlset) {
9778c14b TI	227	status = AE_SUPPORT;
	228	goto out;
	229	}
5e0b9947 KK	230
	231	control_set = osc_data->control_set \| ctrlset;
	232	osc_args.capbuf[OSC_QUERY_TYPE] = 0;
	233	osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
	234	osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
	235	status = acpi_run_osc(handle, &osc_args);
	236	if (ACPI_SUCCESS(status))
	237	osc_data->control_set = control_set;
9778c14b TI	238	out:
9778c14b TI	239	mutex_unlock(&pci_acpi_lock);
1da177e4 LT	240	return status;
	241	}
	242	EXPORT_SYMBOL(pci_osc_control_set);
84df749f	243
0f64474b DSL	244	/*
	245	* _SxD returns the D-state with the highest power
	246	* (lowest D-state number) supported in the S-state "x".
	247	*
	248	* If the devices does not have a _PRW
	249	* (Power Resources for Wake) supporting system wakeup from "x"
	250	* then the OS is free to choose a lower power (higher number
	251	* D-state) than the return value from _SxD.
	252	*
	253	* But if _PRW is enabled at S-state "x", the OS
	254	* must not choose a power lower than _SxD --
	255	* unless the device has an _SxW method specifying
	256	* the lowest power (highest D-state number) the device
	257	* may enter while still able to wake the system.
	258	*
	259	* ie. depending on global OS policy:
	260	*
	261	* if (_PRW at S-state x)
	262	* choose from highest power _SxD to lowest power _SxW
	263	* else // no _PRW at S-state x
	264	* choose highest power _SxD or any lower power
0f64474b DSL	265	*/
0f64474b DSL	266
8d2bdf49	267	static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
0f64474b	268	{
ab826ca4	269	int acpi_state;
0f64474b	270
06166780	271	acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
ab826ca4 SL	272	if (acpi_state < 0)
	273	return PCI_POWER_ERROR;
	274
	275	switch (acpi_state) {
	276	case ACPI_STATE_D0:
	277	return PCI_D0;
	278	case ACPI_STATE_D1:
	279	return PCI_D1;
	280	case ACPI_STATE_D2:
	281	return PCI_D2;
	282	case ACPI_STATE_D3:
	283	return PCI_D3hot;
	284	}
	285	return PCI_POWER_ERROR;
0f64474b	286	}
961d9120 RW	287
	288	static bool acpi_pci_power_manageable(struct pci_dev *dev)
	289	{
	290	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
	291
	292	return handle ? acpi_bus_power_manageable(handle) : false;
	293	}
0f64474b	294
b913100d DSL	295	static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
	296	{
	297	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
10b3dcae	298	acpi_handle tmp;
583c377f DB	299	static const u8 state_conv[] = {
	300	[PCI_D0] = ACPI_STATE_D0,
	301	[PCI_D1] = ACPI_STATE_D1,
	302	[PCI_D2] = ACPI_STATE_D2,
	303	[PCI_D3hot] = ACPI_STATE_D3,
	304	[PCI_D3cold] = ACPI_STATE_D3
b913100d	305	};
44e4e66e	306	int error = -EINVAL;
b913100d	307
10b3dcae	308	/* If the ACPI device has _EJ0, ignore the device */
44e4e66e RW	309	if (!handle \|\| ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
44e4e66e RW	310	return -ENODEV;
583c377f DB	311
	312	switch (state) {
	313	case PCI_D0:
	314	case PCI_D1:
	315	case PCI_D2:
	316	case PCI_D3hot:
	317	case PCI_D3cold:
44e4e66e	318	error = acpi_bus_set_power(handle, state_conv[state]);
583c377f	319	}
44e4e66e RW	320
	321	if (!error)
	322	dev_printk(KERN_INFO, &dev->dev,
	323	"power state changed by ACPI to D%d\n", state);
	324
	325	return error;
b913100d DSL	326	}
b913100d DSL	327
eb9d0fe4 RW	328	static bool acpi_pci_can_wakeup(struct pci_dev *dev)
	329	{
	330	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
	331
	332	return handle ? acpi_bus_can_wakeup(handle) : false;
	333	}
	334
	335	static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
	336	{
	337	int error = acpi_pm_device_sleep_wake(&dev->dev, enable);
	338
	339	if (!error)
	340	dev_printk(KERN_INFO, &dev->dev,
	341	"wake-up capability %s by ACPI\n",
	342	enable ? "enabled" : "disabled");
	343	return error;
	344	}
	345
961d9120 RW	346	static struct pci_platform_pm_ops acpi_pci_platform_pm = {
	347	.is_manageable = acpi_pci_power_manageable,
	348	.set_state = acpi_pci_set_power_state,
	349	.choose_state = acpi_pci_choose_state,
eb9d0fe4 RW	350	.can_wakeup = acpi_pci_can_wakeup,
eb9d0fe4 RW	351	.sleep_wake = acpi_pci_sleep_wake,
961d9120	352	};
b913100d	353
84df749f	354	/* ACPI bus type */
9c273b95	355	static int acpi_pci_find_device(struct device dev, acpi_handle handle)
84df749f DSL	356	{
	357	struct pci_dev * pci_dev;
	358	acpi_integer addr;
	359
	360	pci_dev = to_pci_dev(dev);
	361	/* Please ref to ACPI spec for the syntax of _ADR */
	362	addr = (PCI_SLOT(pci_dev->devfn) << 16) \| PCI_FUNC(pci_dev->devfn);
	363	*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
	364	if (!*handle)
	365	return -ENODEV;
	366	return 0;
	367	}
	368
9c273b95	369	static int acpi_pci_find_root_bridge(struct device dev, acpi_handle handle)
84df749f DSL	370	{
	371	int num;
	372	unsigned int seg, bus;
	373
	374	/*
	375	* The string should be the same as root bridge's name
	376	* Please look at 'pci_scan_bus_parented'
	377	*/
	378	num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
	379	if (num != 2)
	380	return -ENODEV;
	381	*handle = acpi_get_pci_rootbridge_handle(seg, bus);
	382	if (!*handle)
	383	return -ENODEV;
	384	return 0;
	385	}
	386
9c273b95	387	static struct acpi_bus_type acpi_pci_bus = {
84df749f	388	.bus = &pci_bus_type,
9c273b95 MK	389	.find_device = acpi_pci_find_device,
9c273b95 MK	390	.find_bridge = acpi_pci_find_root_bridge,
84df749f DSL	391	};
84df749f DSL	392
9c273b95	393	static int __init acpi_pci_init(void)
84df749f DSL	394	{
	395	int ret;
	396
f8993aff SL	397	if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
	398	printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
	399	pci_no_msi();
	400	}
5fde244d SL	401
	402	if (acpi_gbl_FADT.boot_flags & BAF_PCIE_ASPM_CONTROL) {
	403	printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
	404	pcie_no_aspm();
	405	}
	406
9c273b95	407	ret = register_acpi_bus_type(&acpi_pci_bus);
84df749f DSL	408	if (ret)
84df749f DSL	409	return 0;
961d9120	410	pci_set_platform_pm(&acpi_pci_platform_pm);
84df749f DSL	411	return 0;
84df749f DSL	412	}
9c273b95	413	arch_initcall(acpi_pci_init);