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1da177e4 LT |
1 | /* |
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]; | |
36 | struct acpi_buffer output; | |
37 | union acpi_object out_obj; | |
38 | u32 osc_dw0; | |
39 | ||
40 | /* Setting up output buffer */ | |
41 | output.length = sizeof(out_obj) + 3*sizeof(u32); | |
42 | output.pointer = &out_obj; | |
43 | ||
44 | /* Setting up input parameters */ | |
45 | input.count = 4; | |
46 | input.pointer = in_params; | |
47 | in_params[0].type = ACPI_TYPE_BUFFER; | |
48 | in_params[0].buffer.length = 16; | |
49 | in_params[0].buffer.pointer = OSC_UUID; | |
50 | in_params[1].type = ACPI_TYPE_INTEGER; | |
51 | in_params[1].integer.value = 1; | |
52 | in_params[2].type = ACPI_TYPE_INTEGER; | |
53 | in_params[2].integer.value = 3; | |
54 | in_params[3].type = ACPI_TYPE_BUFFER; | |
55 | in_params[3].buffer.length = 12; | |
56 | in_params[3].buffer.pointer = (u8 *)context; | |
57 | ||
58 | status = acpi_evaluate_object(handle, "_OSC", &input, &output); | |
59 | if (ACPI_FAILURE (status)) { | |
60 | printk(KERN_DEBUG | |
61 | "Evaluate _OSC Set fails. Status = 0x%04x\n", status); | |
62 | return status; | |
63 | } | |
64 | if (out_obj.type != ACPI_TYPE_BUFFER) { | |
65 | printk(KERN_DEBUG | |
66 | "Evaluate _OSC returns wrong type\n"); | |
67 | return AE_TYPE; | |
68 | } | |
69 | osc_dw0 = *((u32 *) out_obj.buffer.pointer); | |
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 */ | |
79 | global_ctrlsets = *((u32 *)(out_obj.buffer.pointer+8)); | |
80 | return AE_OK; | |
81 | } | |
82 | return AE_ERROR; | |
83 | } | |
84 | ||
85 | /* Update Global Control Set */ | |
86 | global_ctrlsets = *((u32 *)(out_obj.buffer.pointer + 8)); | |
87 | return AE_OK; | |
88 | } | |
89 | ||
90 | ||
91 | static acpi_status | |
92 | acpi_run_osc ( | |
93 | acpi_handle handle, | |
94 | u32 level, | |
95 | void *context, | |
96 | void **retval ) | |
97 | { | |
98 | acpi_status status; | |
99 | struct acpi_object_list input; | |
100 | union acpi_object in_params[4]; | |
101 | struct acpi_buffer output; | |
102 | union acpi_object out_obj; | |
103 | u32 osc_dw0; | |
104 | ||
105 | /* Setting up output buffer */ | |
106 | output.length = sizeof(out_obj) + 3*sizeof(u32); | |
107 | output.pointer = &out_obj; | |
108 | ||
109 | /* Setting up input parameters */ | |
110 | input.count = 4; | |
111 | input.pointer = in_params; | |
112 | in_params[0].type = ACPI_TYPE_BUFFER; | |
113 | in_params[0].buffer.length = 16; | |
114 | in_params[0].buffer.pointer = OSC_UUID; | |
115 | in_params[1].type = ACPI_TYPE_INTEGER; | |
116 | in_params[1].integer.value = 1; | |
117 | in_params[2].type = ACPI_TYPE_INTEGER; | |
118 | in_params[2].integer.value = 3; | |
119 | in_params[3].type = ACPI_TYPE_BUFFER; | |
120 | in_params[3].buffer.length = 12; | |
121 | in_params[3].buffer.pointer = (u8 *)context; | |
122 | ||
123 | status = acpi_evaluate_object(handle, "_OSC", &input, &output); | |
124 | if (ACPI_FAILURE (status)) { | |
125 | printk(KERN_DEBUG | |
126 | "Evaluate _OSC Set fails. Status = 0x%04x\n", status); | |
127 | return status; | |
128 | } | |
129 | if (out_obj.type != ACPI_TYPE_BUFFER) { | |
130 | printk(KERN_DEBUG | |
131 | "Evaluate _OSC returns wrong type\n"); | |
132 | return AE_TYPE; | |
133 | } | |
134 | osc_dw0 = *((u32 *) out_obj.buffer.pointer); | |
135 | if (osc_dw0) { | |
136 | if (osc_dw0 & OSC_REQUEST_ERROR) | |
137 | printk(KERN_DEBUG "_OSC request fails\n"); | |
138 | if (osc_dw0 & OSC_INVALID_UUID_ERROR) | |
139 | printk(KERN_DEBUG "_OSC invalid UUID\n"); | |
140 | if (osc_dw0 & OSC_INVALID_REVISION_ERROR) | |
141 | printk(KERN_DEBUG "_OSC invalid revision\n"); | |
142 | if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) { | |
143 | printk(KERN_DEBUG "_OSC FW not grant req. control\n"); | |
144 | return AE_SUPPORT; | |
145 | } | |
146 | return AE_ERROR; | |
147 | } | |
148 | return AE_OK; | |
149 | } | |
150 | ||
151 | /** | |
152 | * pci_osc_support_set - register OS support to Firmware | |
153 | * @flags: OS support bits | |
154 | * | |
155 | * Update OS support fields and doing a _OSC Query to obtain an update | |
156 | * from Firmware on supported control bits. | |
157 | **/ | |
158 | acpi_status pci_osc_support_set(u32 flags) | |
159 | { | |
160 | u32 temp; | |
161 | ||
162 | if (!(flags & OSC_SUPPORT_MASKS)) { | |
163 | return AE_TYPE; | |
164 | } | |
165 | ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS); | |
166 | ||
167 | /* do _OSC query for all possible controls */ | |
168 | temp = ctrlset_buf[OSC_CONTROL_TYPE]; | |
169 | ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; | |
170 | ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS; | |
171 | acpi_get_devices ( PCI_ROOT_HID_STRING, | |
172 | acpi_query_osc, | |
173 | ctrlset_buf, | |
174 | NULL ); | |
175 | ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE; | |
176 | ctrlset_buf[OSC_CONTROL_TYPE] = temp; | |
177 | return AE_OK; | |
178 | } | |
179 | EXPORT_SYMBOL(pci_osc_support_set); | |
180 | ||
181 | /** | |
182 | * pci_osc_control_set - commit requested control to Firmware | |
183 | * @flags: driver's requested control bits | |
184 | * | |
185 | * Attempt to take control from Firmware on requested control bits. | |
186 | **/ | |
187 | acpi_status pci_osc_control_set(u32 flags) | |
188 | { | |
189 | acpi_status status; | |
190 | u32 ctrlset; | |
191 | ||
192 | ctrlset = (flags & OSC_CONTROL_MASKS); | |
193 | if (!ctrlset) { | |
194 | return AE_TYPE; | |
195 | } | |
196 | if (ctrlset_buf[OSC_SUPPORT_TYPE] && | |
197 | ((global_ctrlsets & ctrlset) != ctrlset)) { | |
198 | return AE_SUPPORT; | |
199 | } | |
200 | ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset; | |
201 | status = acpi_get_devices ( PCI_ROOT_HID_STRING, | |
202 | acpi_run_osc, | |
203 | ctrlset_buf, | |
204 | NULL ); | |
205 | if (ACPI_FAILURE (status)) { | |
206 | ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset; | |
207 | } | |
208 | ||
209 | return status; | |
210 | } | |
211 | EXPORT_SYMBOL(pci_osc_control_set); | |
84df749f | 212 | |
0f64474b DSL |
213 | /* |
214 | * _SxD returns the D-state with the highest power | |
215 | * (lowest D-state number) supported in the S-state "x". | |
216 | * | |
217 | * If the devices does not have a _PRW | |
218 | * (Power Resources for Wake) supporting system wakeup from "x" | |
219 | * then the OS is free to choose a lower power (higher number | |
220 | * D-state) than the return value from _SxD. | |
221 | * | |
222 | * But if _PRW is enabled at S-state "x", the OS | |
223 | * must not choose a power lower than _SxD -- | |
224 | * unless the device has an _SxW method specifying | |
225 | * the lowest power (highest D-state number) the device | |
226 | * may enter while still able to wake the system. | |
227 | * | |
228 | * ie. depending on global OS policy: | |
229 | * | |
230 | * if (_PRW at S-state x) | |
231 | * choose from highest power _SxD to lowest power _SxW | |
232 | * else // no _PRW at S-state x | |
233 | * choose highest power _SxD or any lower power | |
234 | * | |
235 | * currently we simply return _SxD, if present. | |
236 | */ | |
237 | ||
238 | static int acpi_pci_choose_state(struct pci_dev *pdev, pm_message_t state) | |
239 | { | |
a406d9e6 | 240 | /* TBD */ |
0f64474b | 241 | |
0f64474b DSL |
242 | return -ENODEV; |
243 | } | |
244 | ||
b913100d DSL |
245 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
246 | { | |
247 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
248 | static int state_conv[] = { | |
249 | [0] = 0, | |
250 | [1] = 1, | |
251 | [2] = 2, | |
252 | [3] = 3, | |
253 | [4] = 3 | |
254 | }; | |
255 | int acpi_state = state_conv[(int __force) state]; | |
256 | ||
257 | if (!handle) | |
258 | return -ENODEV; | |
259 | return acpi_bus_set_power(handle, acpi_state); | |
260 | } | |
261 | ||
262 | ||
84df749f DSL |
263 | /* ACPI bus type */ |
264 | static int pci_acpi_find_device(struct device *dev, acpi_handle *handle) | |
265 | { | |
266 | struct pci_dev * pci_dev; | |
267 | acpi_integer addr; | |
268 | ||
269 | pci_dev = to_pci_dev(dev); | |
270 | /* Please ref to ACPI spec for the syntax of _ADR */ | |
271 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); | |
272 | *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); | |
273 | if (!*handle) | |
274 | return -ENODEV; | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static int pci_acpi_find_root_bridge(struct device *dev, acpi_handle *handle) | |
279 | { | |
280 | int num; | |
281 | unsigned int seg, bus; | |
282 | ||
283 | /* | |
284 | * The string should be the same as root bridge's name | |
285 | * Please look at 'pci_scan_bus_parented' | |
286 | */ | |
287 | num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus); | |
288 | if (num != 2) | |
289 | return -ENODEV; | |
290 | *handle = acpi_get_pci_rootbridge_handle(seg, bus); | |
291 | if (!*handle) | |
292 | return -ENODEV; | |
293 | return 0; | |
294 | } | |
295 | ||
296 | static struct acpi_bus_type pci_acpi_bus = { | |
297 | .bus = &pci_bus_type, | |
298 | .find_device = pci_acpi_find_device, | |
299 | .find_bridge = pci_acpi_find_root_bridge, | |
300 | }; | |
301 | ||
302 | static int __init pci_acpi_init(void) | |
303 | { | |
304 | int ret; | |
305 | ||
306 | ret = register_acpi_bus_type(&pci_acpi_bus); | |
307 | if (ret) | |
308 | return 0; | |
0f64474b | 309 | platform_pci_choose_state = acpi_pci_choose_state; |
b913100d | 310 | platform_pci_set_power_state = acpi_pci_set_power_state; |
84df749f DSL |
311 | return 0; |
312 | } | |
313 | arch_initcall(pci_acpi_init); |