pci-acpi.c 8.0 KB
Newer Older
L
Linus Torvalds 已提交
1 2
/*
 * File:	pci-acpi.c
3
 * Purpose:	Provide PCI support in ACPI
L
Linus Torvalds 已提交
4
 *
5 6 7
 * 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.
L
Linus Torvalds 已提交
8 9 10 11 12 13 14 15 16 17 18 19
 */

#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>
20
#include "pci.h"
L
Linus Torvalds 已提交
21 22 23

static u32 ctrlset_buf[3] = {0, 0, 0};
static u32 global_ctrlsets = 0;
24
static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
L
Linus Torvalds 已提交
25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93

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;
	union acpi_object 	out_obj;	
	u32			osc_dw0;

	/* Setting up output buffer */
	output.length = sizeof(out_obj) + 3*sizeof(u32);  
	output.pointer = &out_obj;
	
	/* 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)) {
		printk(KERN_DEBUG  
			"Evaluate _OSC Set fails. Status = 0x%04x\n", status);
		return status;
	}
	if (out_obj.type != ACPI_TYPE_BUFFER) {
		printk(KERN_DEBUG  
			"Evaluate _OSC returns wrong type\n");
		return AE_TYPE;
	}
	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));
			return AE_OK;
		}
		return AE_ERROR;
	}

	/* Update Global Control Set */
	global_ctrlsets = *((u32 *)(out_obj.buffer.pointer + 8));
	return AE_OK;
}


static acpi_status  
acpi_run_osc (
	acpi_handle	handle,
94
	void		*context)
L
Linus Torvalds 已提交
95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180
{
	acpi_status		status;
	struct acpi_object_list	input;
	union acpi_object 	in_params[4];
	struct acpi_buffer	output;
	union acpi_object 	out_obj;	
	u32			osc_dw0;

	/* Setting up output buffer */
	output.length = sizeof(out_obj) + 3*sizeof(u32);  
	output.pointer = &out_obj;
	
	/* 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)) {
		printk(KERN_DEBUG  
			"Evaluate _OSC Set fails. Status = 0x%04x\n", status);
		return status;
	}
	if (out_obj.type != ACPI_TYPE_BUFFER) {
		printk(KERN_DEBUG  
			"Evaluate _OSC returns wrong type\n");
		return AE_TYPE;
	}
	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");
			return AE_SUPPORT;
		}
		return AE_ERROR;
	}
	return AE_OK;
}

/**
 * pci_osc_support_set - register OS support to Firmware
 * @flags: OS support bits
 *
 * 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)
{
	u32 temp;

	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 ( PCI_ROOT_HID_STRING,
			acpi_query_osc,
			ctrlset_buf,
			NULL );
	ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE;
	ctrlset_buf[OSC_CONTROL_TYPE] = temp;
	return AE_OK;
}
EXPORT_SYMBOL(pci_osc_support_set);

/**
 * pci_osc_control_set - commit requested control to Firmware
181
 * @handle: acpi_handle for the target ACPI object
L
Linus Torvalds 已提交
182 183 184 185
 * @flags: driver's requested control bits
 *
 * Attempt to take control from Firmware on requested control bits.
 **/
186
acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
L
Linus Torvalds 已提交
187 188 189 190 191 192 193 194 195 196 197 198 199
{
	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;
200
	status = acpi_run_osc(handle, ctrlset_buf);
L
Linus Torvalds 已提交
201 202 203 204 205 206 207
	if (ACPI_FAILURE (status)) {
		ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
	}
	
	return status;
}
EXPORT_SYMBOL(pci_osc_control_set);
208

209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235
/*
 * _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
 *
 * currently we simply return _SxD, if present.
 */

static int acpi_pci_choose_state(struct pci_dev *pdev, pm_message_t state)
{
236
	/* TBD */
237 238 239 240

	return -ENODEV;
}

241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258
static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
{
	acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
	static int state_conv[] = {
		[0] = 0,
		[1] = 1,
		[2] = 2,
		[3] = 3,
		[4] = 3
	};
	int acpi_state = state_conv[(int __force) state];

	if (!handle)
		return -ENODEV;
	return acpi_bus_set_power(handle, acpi_state);
}


259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304
/* ACPI bus type */
static int pci_acpi_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 pci_acpi_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 pci_acpi_bus = {
	.bus = &pci_bus_type,
	.find_device = pci_acpi_find_device,
	.find_bridge = pci_acpi_find_root_bridge,
};

static int __init pci_acpi_init(void)
{
	int ret;

	ret = register_acpi_bus_type(&pci_acpi_bus);
	if (ret)
		return 0;
305
	platform_pci_choose_state = acpi_pci_choose_state;
306
	platform_pci_set_power_state = acpi_pci_set_power_state;
307 308 309
	return 0;
}
arch_initcall(pci_acpi_init);