Commit | Line | Data |
---|---|---|
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 | 21 | |
a5d1c879 SL |
22 | struct acpi_osc_data { |
23 | acpi_handle handle; | |
24 | u32 ctrlset_buf[3]; | |
25 | u32 global_ctrlsets; | |
26 | struct list_head sibiling; | |
27 | }; | |
28 | static LIST_HEAD(acpi_osc_data_list); | |
29 | ||
30 | static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle) | |
31 | { | |
32 | struct acpi_osc_data *data; | |
33 | ||
34 | list_for_each_entry(data, &acpi_osc_data_list, sibiling) { | |
35 | if (data->handle == handle) | |
36 | return data; | |
37 | } | |
38 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
39 | if (!data) | |
40 | return NULL; | |
41 | INIT_LIST_HEAD(&data->sibiling); | |
42 | data->handle = handle; | |
43 | list_add_tail(&data->sibiling, &acpi_osc_data_list); | |
44 | return data; | |
45 | } | |
46 | ||
bc56b9e0 | 47 | static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66}; |
1da177e4 LT |
48 | |
49 | static acpi_status | |
50 | acpi_query_osc ( | |
51 | acpi_handle handle, | |
52 | u32 level, | |
53 | void *context, | |
54 | void **retval ) | |
55 | { | |
56 | acpi_status status; | |
57 | struct acpi_object_list input; | |
58 | union acpi_object in_params[4]; | |
593ee207 KA |
59 | struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; |
60 | union acpi_object *out_obj; | |
1da177e4 | 61 | u32 osc_dw0; |
0dcb2b7e | 62 | acpi_status *ret_status = (acpi_status *)retval; |
c4e5fadd | 63 | struct acpi_osc_data *osc_data; |
a5d1c879 | 64 | u32 flags = (unsigned long)context, temp; |
c4e5fadd | 65 | acpi_handle tmp; |
a5d1c879 | 66 | |
c4e5fadd KK |
67 | status = acpi_get_handle(handle, "_OSC", &tmp); |
68 | if (ACPI_FAILURE(status)) | |
69 | return status; | |
70 | ||
71 | osc_data = acpi_get_osc_data(handle); | |
a5d1c879 SL |
72 | if (!osc_data) { |
73 | printk(KERN_ERR "acpi osc data array is full\n"); | |
74 | return AE_ERROR; | |
75 | } | |
76 | ||
77 | osc_data->ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS); | |
78 | ||
79 | /* do _OSC query for all possible controls */ | |
80 | temp = osc_data->ctrlset_buf[OSC_CONTROL_TYPE]; | |
81 | osc_data->ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; | |
82 | osc_data->ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS; | |
1da177e4 | 83 | |
1da177e4 LT |
84 | /* Setting up input parameters */ |
85 | input.count = 4; | |
86 | input.pointer = in_params; | |
87 | in_params[0].type = ACPI_TYPE_BUFFER; | |
88 | in_params[0].buffer.length = 16; | |
89 | in_params[0].buffer.pointer = OSC_UUID; | |
90 | in_params[1].type = ACPI_TYPE_INTEGER; | |
91 | in_params[1].integer.value = 1; | |
92 | in_params[2].type = ACPI_TYPE_INTEGER; | |
93 | in_params[2].integer.value = 3; | |
94 | in_params[3].type = ACPI_TYPE_BUFFER; | |
95 | in_params[3].buffer.length = 12; | |
a5d1c879 | 96 | in_params[3].buffer.pointer = (u8 *)osc_data->ctrlset_buf; |
1da177e4 LT |
97 | |
98 | status = acpi_evaluate_object(handle, "_OSC", &input, &output); | |
a5d1c879 SL |
99 | if (ACPI_FAILURE(status)) |
100 | goto out_nofree; | |
593ee207 KA |
101 | out_obj = output.pointer; |
102 | ||
103 | if (out_obj->type != ACPI_TYPE_BUFFER) { | |
1da177e4 LT |
104 | printk(KERN_DEBUG |
105 | "Evaluate _OSC returns wrong type\n"); | |
593ee207 KA |
106 | status = AE_TYPE; |
107 | goto query_osc_out; | |
1da177e4 | 108 | } |
593ee207 | 109 | osc_dw0 = *((u32 *) out_obj->buffer.pointer); |
1da177e4 LT |
110 | if (osc_dw0) { |
111 | if (osc_dw0 & OSC_REQUEST_ERROR) | |
112 | printk(KERN_DEBUG "_OSC request fails\n"); | |
113 | if (osc_dw0 & OSC_INVALID_UUID_ERROR) | |
114 | printk(KERN_DEBUG "_OSC invalid UUID\n"); | |
115 | if (osc_dw0 & OSC_INVALID_REVISION_ERROR) | |
116 | printk(KERN_DEBUG "_OSC invalid revision\n"); | |
117 | if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) { | |
118 | /* Update Global Control Set */ | |
a5d1c879 SL |
119 | osc_data->global_ctrlsets = |
120 | *((u32 *)(out_obj->buffer.pointer + 8)); | |
593ee207 KA |
121 | status = AE_OK; |
122 | goto query_osc_out; | |
1da177e4 | 123 | } |
593ee207 KA |
124 | status = AE_ERROR; |
125 | goto query_osc_out; | |
1da177e4 LT |
126 | } |
127 | ||
128 | /* Update Global Control Set */ | |
a5d1c879 | 129 | osc_data->global_ctrlsets = *((u32 *)(out_obj->buffer.pointer + 8)); |
593ee207 KA |
130 | status = AE_OK; |
131 | ||
132 | query_osc_out: | |
133 | kfree(output.pointer); | |
a5d1c879 | 134 | out_nofree: |
0dcb2b7e | 135 | *ret_status = status; |
a5d1c879 SL |
136 | |
137 | osc_data->ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE; | |
138 | osc_data->ctrlset_buf[OSC_CONTROL_TYPE] = temp; | |
139 | if (ACPI_FAILURE(status)) { | |
140 | /* no osc support at all */ | |
141 | osc_data->ctrlset_buf[OSC_SUPPORT_TYPE] = 0; | |
142 | } | |
143 | ||
593ee207 | 144 | return status; |
1da177e4 LT |
145 | } |
146 | ||
147 | ||
148 | static acpi_status | |
149 | acpi_run_osc ( | |
150 | acpi_handle handle, | |
427bf532 | 151 | void *context) |
1da177e4 LT |
152 | { |
153 | acpi_status status; | |
154 | struct acpi_object_list input; | |
155 | union acpi_object in_params[4]; | |
593ee207 KA |
156 | struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; |
157 | union acpi_object *out_obj; | |
1da177e4 LT |
158 | u32 osc_dw0; |
159 | ||
1da177e4 LT |
160 | /* Setting up input parameters */ |
161 | input.count = 4; | |
162 | input.pointer = in_params; | |
163 | in_params[0].type = ACPI_TYPE_BUFFER; | |
164 | in_params[0].buffer.length = 16; | |
165 | in_params[0].buffer.pointer = OSC_UUID; | |
166 | in_params[1].type = ACPI_TYPE_INTEGER; | |
167 | in_params[1].integer.value = 1; | |
168 | in_params[2].type = ACPI_TYPE_INTEGER; | |
169 | in_params[2].integer.value = 3; | |
170 | in_params[3].type = ACPI_TYPE_BUFFER; | |
171 | in_params[3].buffer.length = 12; | |
172 | in_params[3].buffer.pointer = (u8 *)context; | |
173 | ||
174 | status = acpi_evaluate_object(handle, "_OSC", &input, &output); | |
8d29bfb7 | 175 | if (ACPI_FAILURE (status)) |
1da177e4 | 176 | return status; |
8d29bfb7 | 177 | |
593ee207 KA |
178 | out_obj = output.pointer; |
179 | if (out_obj->type != ACPI_TYPE_BUFFER) { | |
1da177e4 LT |
180 | printk(KERN_DEBUG |
181 | "Evaluate _OSC returns wrong type\n"); | |
593ee207 KA |
182 | status = AE_TYPE; |
183 | goto run_osc_out; | |
1da177e4 | 184 | } |
593ee207 | 185 | osc_dw0 = *((u32 *) out_obj->buffer.pointer); |
1da177e4 LT |
186 | if (osc_dw0) { |
187 | if (osc_dw0 & OSC_REQUEST_ERROR) | |
188 | printk(KERN_DEBUG "_OSC request fails\n"); | |
189 | if (osc_dw0 & OSC_INVALID_UUID_ERROR) | |
190 | printk(KERN_DEBUG "_OSC invalid UUID\n"); | |
191 | if (osc_dw0 & OSC_INVALID_REVISION_ERROR) | |
192 | printk(KERN_DEBUG "_OSC invalid revision\n"); | |
193 | if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) { | |
194 | printk(KERN_DEBUG "_OSC FW not grant req. control\n"); | |
593ee207 KA |
195 | status = AE_SUPPORT; |
196 | goto run_osc_out; | |
1da177e4 | 197 | } |
593ee207 KA |
198 | status = AE_ERROR; |
199 | goto run_osc_out; | |
1da177e4 | 200 | } |
593ee207 KA |
201 | status = AE_OK; |
202 | ||
203 | run_osc_out: | |
204 | kfree(output.pointer); | |
205 | return status; | |
1da177e4 LT |
206 | } |
207 | ||
208 | /** | |
c2778357 | 209 | * __pci_osc_support_set - register OS support to Firmware |
1da177e4 | 210 | * @flags: OS support bits |
5958f1a4 | 211 | * @hid: hardware ID |
1da177e4 LT |
212 | * |
213 | * Update OS support fields and doing a _OSC Query to obtain an update | |
214 | * from Firmware on supported control bits. | |
215 | **/ | |
c2778357 | 216 | acpi_status __pci_osc_support_set(u32 flags, const char *hid) |
1da177e4 | 217 | { |
21e2b0a5 | 218 | acpi_status retval = AE_NOT_FOUND; |
1da177e4 LT |
219 | |
220 | if (!(flags & OSC_SUPPORT_MASKS)) { | |
221 | return AE_TYPE; | |
222 | } | |
c2778357 | 223 | acpi_get_devices(hid, |
1da177e4 | 224 | acpi_query_osc, |
a5d1c879 | 225 | (void *)(unsigned long)flags, |
0dcb2b7e | 226 | (void **) &retval ); |
1da177e4 LT |
227 | return AE_OK; |
228 | } | |
1da177e4 LT |
229 | |
230 | /** | |
231 | * pci_osc_control_set - commit requested control to Firmware | |
f366633f | 232 | * @handle: acpi_handle for the target ACPI object |
1da177e4 LT |
233 | * @flags: driver's requested control bits |
234 | * | |
235 | * Attempt to take control from Firmware on requested control bits. | |
236 | **/ | |
427bf532 | 237 | acpi_status pci_osc_control_set(acpi_handle handle, u32 flags) |
1da177e4 LT |
238 | { |
239 | acpi_status status; | |
240 | u32 ctrlset; | |
34a65055 KK |
241 | acpi_handle tmp; |
242 | struct acpi_osc_data *osc_data; | |
243 | ||
244 | status = acpi_get_handle(handle, "_OSC", &tmp); | |
245 | if (ACPI_FAILURE(status)) | |
246 | return status; | |
a5d1c879 | 247 | |
34a65055 | 248 | osc_data = acpi_get_osc_data(handle); |
a5d1c879 SL |
249 | if (!osc_data) { |
250 | printk(KERN_ERR "acpi osc data array is full\n"); | |
251 | return AE_ERROR; | |
252 | } | |
1da177e4 LT |
253 | |
254 | ctrlset = (flags & OSC_CONTROL_MASKS); | |
255 | if (!ctrlset) { | |
256 | return AE_TYPE; | |
257 | } | |
a5d1c879 SL |
258 | if (osc_data->ctrlset_buf[OSC_SUPPORT_TYPE] && |
259 | ((osc_data->global_ctrlsets & ctrlset) != ctrlset)) { | |
1da177e4 LT |
260 | return AE_SUPPORT; |
261 | } | |
a5d1c879 SL |
262 | osc_data->ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset; |
263 | status = acpi_run_osc(handle, osc_data->ctrlset_buf); | |
1da177e4 | 264 | if (ACPI_FAILURE (status)) { |
a5d1c879 | 265 | osc_data->ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset; |
1da177e4 LT |
266 | } |
267 | ||
268 | return status; | |
269 | } | |
270 | EXPORT_SYMBOL(pci_osc_control_set); | |
84df749f | 271 | |
673d5b43 | 272 | #ifdef CONFIG_ACPI_SLEEP |
0f64474b DSL |
273 | /* |
274 | * _SxD returns the D-state with the highest power | |
275 | * (lowest D-state number) supported in the S-state "x". | |
276 | * | |
277 | * If the devices does not have a _PRW | |
278 | * (Power Resources for Wake) supporting system wakeup from "x" | |
279 | * then the OS is free to choose a lower power (higher number | |
280 | * D-state) than the return value from _SxD. | |
281 | * | |
282 | * But if _PRW is enabled at S-state "x", the OS | |
283 | * must not choose a power lower than _SxD -- | |
284 | * unless the device has an _SxW method specifying | |
285 | * the lowest power (highest D-state number) the device | |
286 | * may enter while still able to wake the system. | |
287 | * | |
288 | * ie. depending on global OS policy: | |
289 | * | |
290 | * if (_PRW at S-state x) | |
291 | * choose from highest power _SxD to lowest power _SxW | |
292 | * else // no _PRW at S-state x | |
293 | * choose highest power _SxD or any lower power | |
0f64474b DSL |
294 | */ |
295 | ||
ab826ca4 SL |
296 | static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev, |
297 | pm_message_t state) | |
0f64474b | 298 | { |
ab826ca4 | 299 | int acpi_state; |
0f64474b | 300 | |
ab826ca4 SL |
301 | acpi_state = acpi_pm_device_sleep_state(&pdev->dev, |
302 | device_may_wakeup(&pdev->dev), NULL); | |
303 | if (acpi_state < 0) | |
304 | return PCI_POWER_ERROR; | |
305 | ||
306 | switch (acpi_state) { | |
307 | case ACPI_STATE_D0: | |
308 | return PCI_D0; | |
309 | case ACPI_STATE_D1: | |
310 | return PCI_D1; | |
311 | case ACPI_STATE_D2: | |
312 | return PCI_D2; | |
313 | case ACPI_STATE_D3: | |
314 | return PCI_D3hot; | |
315 | } | |
316 | return PCI_POWER_ERROR; | |
0f64474b | 317 | } |
673d5b43 | 318 | #endif |
0f64474b | 319 | |
b913100d DSL |
320 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
321 | { | |
322 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
10b3dcae | 323 | acpi_handle tmp; |
583c377f DB |
324 | static const u8 state_conv[] = { |
325 | [PCI_D0] = ACPI_STATE_D0, | |
326 | [PCI_D1] = ACPI_STATE_D1, | |
327 | [PCI_D2] = ACPI_STATE_D2, | |
328 | [PCI_D3hot] = ACPI_STATE_D3, | |
329 | [PCI_D3cold] = ACPI_STATE_D3 | |
b913100d | 330 | }; |
b913100d DSL |
331 | |
332 | if (!handle) | |
333 | return -ENODEV; | |
10b3dcae SL |
334 | /* If the ACPI device has _EJ0, ignore the device */ |
335 | if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) | |
336 | return 0; | |
583c377f DB |
337 | |
338 | switch (state) { | |
339 | case PCI_D0: | |
340 | case PCI_D1: | |
341 | case PCI_D2: | |
342 | case PCI_D3hot: | |
343 | case PCI_D3cold: | |
344 | return acpi_bus_set_power(handle, state_conv[state]); | |
345 | } | |
346 | return -EINVAL; | |
b913100d DSL |
347 | } |
348 | ||
349 | ||
84df749f | 350 | /* ACPI bus type */ |
9c273b95 | 351 | static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) |
84df749f DSL |
352 | { |
353 | struct pci_dev * pci_dev; | |
354 | acpi_integer addr; | |
355 | ||
356 | pci_dev = to_pci_dev(dev); | |
357 | /* Please ref to ACPI spec for the syntax of _ADR */ | |
358 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); | |
359 | *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); | |
360 | if (!*handle) | |
361 | return -ENODEV; | |
362 | return 0; | |
363 | } | |
364 | ||
9c273b95 | 365 | static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle) |
84df749f DSL |
366 | { |
367 | int num; | |
368 | unsigned int seg, bus; | |
369 | ||
370 | /* | |
371 | * The string should be the same as root bridge's name | |
372 | * Please look at 'pci_scan_bus_parented' | |
373 | */ | |
374 | num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus); | |
375 | if (num != 2) | |
376 | return -ENODEV; | |
377 | *handle = acpi_get_pci_rootbridge_handle(seg, bus); | |
378 | if (!*handle) | |
379 | return -ENODEV; | |
380 | return 0; | |
381 | } | |
382 | ||
9c273b95 | 383 | static struct acpi_bus_type acpi_pci_bus = { |
84df749f | 384 | .bus = &pci_bus_type, |
9c273b95 MK |
385 | .find_device = acpi_pci_find_device, |
386 | .find_bridge = acpi_pci_find_root_bridge, | |
84df749f DSL |
387 | }; |
388 | ||
9c273b95 | 389 | static int __init acpi_pci_init(void) |
84df749f DSL |
390 | { |
391 | int ret; | |
392 | ||
f8993aff SL |
393 | if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) { |
394 | printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n"); | |
395 | pci_no_msi(); | |
396 | } | |
9c273b95 | 397 | ret = register_acpi_bus_type(&acpi_pci_bus); |
84df749f DSL |
398 | if (ret) |
399 | return 0; | |
673d5b43 | 400 | #ifdef CONFIG_ACPI_SLEEP |
0f64474b | 401 | platform_pci_choose_state = acpi_pci_choose_state; |
673d5b43 | 402 | #endif |
b913100d | 403 | platform_pci_set_power_state = acpi_pci_set_power_state; |
84df749f DSL |
404 | return 0; |
405 | } | |
9c273b95 | 406 | arch_initcall(acpi_pci_init); |