aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/pci/pci-acpi.c
blob: 8eb599708de8b9053bddeb88419da294eec8f9b8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
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
94
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
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
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
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
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
305
/*
 * File:	pci-acpi.c
 * Purpose:	Provde 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;
	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,
	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) {
			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
 * @flags: driver's requested control bits
 *
 * Attempt to take control from Firmware on requested control bits.
 **/
acpi_status pci_osc_control_set(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_get_devices ( PCI_ROOT_HID_STRING,
				acpi_run_osc,
				ctrlset_buf,
				NULL );
	if (ACPI_FAILURE (status)) {
		ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
	}
	
	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
 *
 * currently we simply return _SxD, if present.
 */

static int acpi_pci_choose_state(struct pci_dev *pdev, pm_message_t state)
{
	char dstate_str[] = "_S0D";
	acpi_status status;
	unsigned long val;
	struct device *dev = &pdev->dev;

	/* Fixme: the check is wrong after pm_message_t is a struct */
	if ((state >= PM_SUSPEND_MAX) || !DEVICE_ACPI_HANDLE(dev))
		return -EINVAL;
	dstate_str[2] += state;	/* _S1D, _S2D, _S3D, _S4D */
	status = acpi_evaluate_integer(DEVICE_ACPI_HANDLE(dev), dstate_str,
		NULL, &val);
	if (ACPI_SUCCESS(status))
		return val;
	return -ENODEV;
}

/* 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;
	platform_pci_choose_state = acpi_pci_choose_state;
	return 0;
}
arch_initcall(pci_acpi_init);