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Commit | Line | Data |
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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 | 21 | |
a5d1c879 SL |
22 | struct acpi_osc_data { |
23 | acpi_handle handle; | |
5e0b9947 KK |
24 | u32 support_set; |
25 | u32 control_set; | |
681f7d9d | 26 | int is_queried; |
5e0b9947 | 27 | u32 query_result; |
a5d1c879 SL |
28 | struct list_head sibiling; |
29 | }; | |
30 | static LIST_HEAD(acpi_osc_data_list); | |
31 | ||
5e0b9947 KK |
32 | struct acpi_osc_args { |
33 | u32 capbuf[3]; | |
34 | u32 query_result; | |
35 | }; | |
36 | ||
a5d1c879 SL |
37 | static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle) |
38 | { | |
39 | struct acpi_osc_data *data; | |
40 | ||
41 | list_for_each_entry(data, &acpi_osc_data_list, sibiling) { | |
42 | if (data->handle == handle) | |
43 | return data; | |
44 | } | |
45 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
46 | if (!data) | |
47 | return NULL; | |
48 | INIT_LIST_HEAD(&data->sibiling); | |
49 | data->handle = handle; | |
50 | list_add_tail(&data->sibiling, &acpi_osc_data_list); | |
51 | return data; | |
52 | } | |
53 | ||
90a57dab KK |
54 | static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, |
55 | 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66}; | |
1da177e4 | 56 | |
8a7a4faf | 57 | static acpi_status acpi_run_osc(acpi_handle handle, |
5e0b9947 | 58 | struct acpi_osc_args *osc_args) |
1da177e4 | 59 | { |
8a7a4faf KK |
60 | acpi_status status; |
61 | struct acpi_object_list input; | |
62 | union acpi_object in_params[4]; | |
63 | struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; | |
64 | union acpi_object *out_obj; | |
5e0b9947 | 65 | u32 osc_dw0, flags = osc_args->capbuf[OSC_QUERY_TYPE]; |
1da177e4 | 66 | |
1da177e4 LT |
67 | /* Setting up input parameters */ |
68 | input.count = 4; | |
69 | input.pointer = in_params; | |
70 | in_params[0].type = ACPI_TYPE_BUFFER; | |
71 | in_params[0].buffer.length = 16; | |
72 | in_params[0].buffer.pointer = OSC_UUID; | |
73 | in_params[1].type = ACPI_TYPE_INTEGER; | |
74 | in_params[1].integer.value = 1; | |
75 | in_params[2].type = ACPI_TYPE_INTEGER; | |
76 | in_params[2].integer.value = 3; | |
77 | in_params[3].type = ACPI_TYPE_BUFFER; | |
78 | in_params[3].buffer.length = 12; | |
5e0b9947 | 79 | in_params[3].buffer.pointer = (u8 *)osc_args->capbuf; |
1da177e4 LT |
80 | |
81 | status = acpi_evaluate_object(handle, "_OSC", &input, &output); | |
a5d1c879 | 82 | if (ACPI_FAILURE(status)) |
8a7a4faf | 83 | return status; |
593ee207 | 84 | |
8a7a4faf | 85 | out_obj = output.pointer; |
593ee207 | 86 | if (out_obj->type != ACPI_TYPE_BUFFER) { |
8a7a4faf | 87 | printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n"); |
593ee207 | 88 | status = AE_TYPE; |
8a7a4faf | 89 | goto out_kfree; |
1da177e4 | 90 | } |
90a57dab | 91 | osc_dw0 = *((u32 *)out_obj->buffer.pointer); |
1da177e4 LT |
92 | if (osc_dw0) { |
93 | if (osc_dw0 & OSC_REQUEST_ERROR) | |
94 | printk(KERN_DEBUG "_OSC request fails\n"); | |
95 | if (osc_dw0 & OSC_INVALID_UUID_ERROR) | |
96 | printk(KERN_DEBUG "_OSC invalid UUID\n"); | |
97 | if (osc_dw0 & OSC_INVALID_REVISION_ERROR) | |
98 | printk(KERN_DEBUG "_OSC invalid revision\n"); | |
99 | if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) { | |
8a7a4faf KK |
100 | if (flags & OSC_QUERY_ENABLE) |
101 | goto out_success; | |
102 | printk(KERN_DEBUG "_OSC FW not grant req. control\n"); | |
103 | status = AE_SUPPORT; | |
104 | goto out_kfree; | |
1da177e4 | 105 | } |
593ee207 | 106 | status = AE_ERROR; |
8a7a4faf KK |
107 | goto out_kfree; |
108 | } | |
109 | out_success: | |
5e0b9947 KK |
110 | if (flags & OSC_QUERY_ENABLE) |
111 | osc_args->query_result = | |
8a7a4faf | 112 | *((u32 *)(out_obj->buffer.pointer + 8)); |
593ee207 KA |
113 | status = AE_OK; |
114 | ||
8a7a4faf | 115 | out_kfree: |
593ee207 KA |
116 | kfree(output.pointer); |
117 | return status; | |
1da177e4 LT |
118 | } |
119 | ||
8a7a4faf KK |
120 | static acpi_status acpi_query_osc(acpi_handle handle, |
121 | u32 level, void *context, void **retval) | |
1da177e4 | 122 | { |
8a7a4faf | 123 | acpi_status status; |
8a7a4faf | 124 | struct acpi_osc_data *osc_data; |
5e0b9947 | 125 | u32 flags = (unsigned long)context, support_set; |
8a7a4faf | 126 | acpi_handle tmp; |
5e0b9947 | 127 | struct acpi_osc_args osc_args; |
1da177e4 | 128 | |
8a7a4faf KK |
129 | status = acpi_get_handle(handle, "_OSC", &tmp); |
130 | if (ACPI_FAILURE(status)) | |
1da177e4 | 131 | return status; |
8d29bfb7 | 132 | |
8a7a4faf KK |
133 | osc_data = acpi_get_osc_data(handle); |
134 | if (!osc_data) { | |
135 | printk(KERN_ERR "acpi osc data array is full\n"); | |
136 | return AE_ERROR; | |
1da177e4 | 137 | } |
8a7a4faf | 138 | |
8a7a4faf | 139 | /* do _OSC query for all possible controls */ |
5e0b9947 KK |
140 | support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS); |
141 | osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; | |
142 | osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set; | |
143 | osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS; | |
8a7a4faf | 144 | |
5e0b9947 | 145 | status = acpi_run_osc(handle, &osc_args); |
5e0b9947 KK |
146 | if (ACPI_SUCCESS(status)) { |
147 | osc_data->support_set = support_set; | |
148 | osc_data->query_result = osc_args.query_result; | |
681f7d9d | 149 | osc_data->is_queried = 1; |
1da177e4 | 150 | } |
593ee207 | 151 | |
593ee207 | 152 | return status; |
1da177e4 LT |
153 | } |
154 | ||
155 | /** | |
c2778357 | 156 | * __pci_osc_support_set - register OS support to Firmware |
1da177e4 | 157 | * @flags: OS support bits |
5958f1a4 | 158 | * @hid: hardware ID |
1da177e4 LT |
159 | * |
160 | * Update OS support fields and doing a _OSC Query to obtain an update | |
161 | * from Firmware on supported control bits. | |
162 | **/ | |
c2778357 | 163 | acpi_status __pci_osc_support_set(u32 flags, const char *hid) |
1da177e4 | 164 | { |
c155062d | 165 | if (!(flags & OSC_SUPPORT_MASKS)) |
1da177e4 | 166 | return AE_TYPE; |
c155062d KK |
167 | |
168 | acpi_get_devices(hid, acpi_query_osc, | |
169 | (void *)(unsigned long)flags, NULL); | |
1da177e4 LT |
170 | return AE_OK; |
171 | } | |
1da177e4 LT |
172 | |
173 | /** | |
174 | * pci_osc_control_set - commit requested control to Firmware | |
f366633f | 175 | * @handle: acpi_handle for the target ACPI object |
1da177e4 LT |
176 | * @flags: driver's requested control bits |
177 | * | |
178 | * Attempt to take control from Firmware on requested control bits. | |
179 | **/ | |
427bf532 | 180 | acpi_status pci_osc_control_set(acpi_handle handle, u32 flags) |
1da177e4 | 181 | { |
5e0b9947 KK |
182 | acpi_status status; |
183 | u32 ctrlset, control_set; | |
34a65055 KK |
184 | acpi_handle tmp; |
185 | struct acpi_osc_data *osc_data; | |
5e0b9947 | 186 | struct acpi_osc_args osc_args; |
34a65055 KK |
187 | |
188 | status = acpi_get_handle(handle, "_OSC", &tmp); | |
189 | if (ACPI_FAILURE(status)) | |
190 | return status; | |
a5d1c879 | 191 | |
34a65055 | 192 | osc_data = acpi_get_osc_data(handle); |
a5d1c879 SL |
193 | if (!osc_data) { |
194 | printk(KERN_ERR "acpi osc data array is full\n"); | |
195 | return AE_ERROR; | |
196 | } | |
1da177e4 LT |
197 | |
198 | ctrlset = (flags & OSC_CONTROL_MASKS); | |
5e0b9947 | 199 | if (!ctrlset) |
1da177e4 | 200 | return AE_TYPE; |
5e0b9947 | 201 | |
681f7d9d | 202 | if (osc_data->is_queried && |
5e0b9947 | 203 | ((osc_data->query_result & ctrlset) != ctrlset)) |
1da177e4 | 204 | return AE_SUPPORT; |
5e0b9947 KK |
205 | |
206 | control_set = osc_data->control_set | ctrlset; | |
207 | osc_args.capbuf[OSC_QUERY_TYPE] = 0; | |
208 | osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set; | |
209 | osc_args.capbuf[OSC_CONTROL_TYPE] = control_set; | |
210 | status = acpi_run_osc(handle, &osc_args); | |
211 | if (ACPI_SUCCESS(status)) | |
212 | osc_data->control_set = control_set; | |
213 | ||
1da177e4 LT |
214 | return status; |
215 | } | |
216 | EXPORT_SYMBOL(pci_osc_control_set); | |
84df749f | 217 | |
0f64474b DSL |
218 | /* |
219 | * _SxD returns the D-state with the highest power | |
220 | * (lowest D-state number) supported in the S-state "x". | |
221 | * | |
222 | * If the devices does not have a _PRW | |
223 | * (Power Resources for Wake) supporting system wakeup from "x" | |
224 | * then the OS is free to choose a lower power (higher number | |
225 | * D-state) than the return value from _SxD. | |
226 | * | |
227 | * But if _PRW is enabled at S-state "x", the OS | |
228 | * must not choose a power lower than _SxD -- | |
229 | * unless the device has an _SxW method specifying | |
230 | * the lowest power (highest D-state number) the device | |
231 | * may enter while still able to wake the system. | |
232 | * | |
233 | * ie. depending on global OS policy: | |
234 | * | |
235 | * if (_PRW at S-state x) | |
236 | * choose from highest power _SxD to lowest power _SxW | |
237 | * else // no _PRW at S-state x | |
238 | * choose highest power _SxD or any lower power | |
0f64474b DSL |
239 | */ |
240 | ||
8d2bdf49 | 241 | static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) |
0f64474b | 242 | { |
ab826ca4 | 243 | int acpi_state; |
0f64474b | 244 | |
06166780 | 245 | acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL); |
ab826ca4 SL |
246 | if (acpi_state < 0) |
247 | return PCI_POWER_ERROR; | |
248 | ||
249 | switch (acpi_state) { | |
250 | case ACPI_STATE_D0: | |
251 | return PCI_D0; | |
252 | case ACPI_STATE_D1: | |
253 | return PCI_D1; | |
254 | case ACPI_STATE_D2: | |
255 | return PCI_D2; | |
256 | case ACPI_STATE_D3: | |
257 | return PCI_D3hot; | |
258 | } | |
259 | return PCI_POWER_ERROR; | |
0f64474b | 260 | } |
961d9120 RW |
261 | |
262 | static bool acpi_pci_power_manageable(struct pci_dev *dev) | |
263 | { | |
264 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
265 | ||
266 | return handle ? acpi_bus_power_manageable(handle) : false; | |
267 | } | |
0f64474b | 268 | |
b913100d DSL |
269 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
270 | { | |
271 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
10b3dcae | 272 | acpi_handle tmp; |
583c377f DB |
273 | static const u8 state_conv[] = { |
274 | [PCI_D0] = ACPI_STATE_D0, | |
275 | [PCI_D1] = ACPI_STATE_D1, | |
276 | [PCI_D2] = ACPI_STATE_D2, | |
277 | [PCI_D3hot] = ACPI_STATE_D3, | |
278 | [PCI_D3cold] = ACPI_STATE_D3 | |
b913100d | 279 | }; |
44e4e66e | 280 | int error = -EINVAL; |
b913100d | 281 | |
10b3dcae | 282 | /* If the ACPI device has _EJ0, ignore the device */ |
44e4e66e RW |
283 | if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) |
284 | return -ENODEV; | |
583c377f DB |
285 | |
286 | switch (state) { | |
287 | case PCI_D0: | |
288 | case PCI_D1: | |
289 | case PCI_D2: | |
290 | case PCI_D3hot: | |
291 | case PCI_D3cold: | |
44e4e66e | 292 | error = acpi_bus_set_power(handle, state_conv[state]); |
583c377f | 293 | } |
44e4e66e RW |
294 | |
295 | if (!error) | |
296 | dev_printk(KERN_INFO, &dev->dev, | |
297 | "power state changed by ACPI to D%d\n", state); | |
298 | ||
299 | return error; | |
b913100d DSL |
300 | } |
301 | ||
961d9120 RW |
302 | static struct pci_platform_pm_ops acpi_pci_platform_pm = { |
303 | .is_manageable = acpi_pci_power_manageable, | |
304 | .set_state = acpi_pci_set_power_state, | |
305 | .choose_state = acpi_pci_choose_state, | |
306 | }; | |
b913100d | 307 | |
84df749f | 308 | /* ACPI bus type */ |
9c273b95 | 309 | static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) |
84df749f DSL |
310 | { |
311 | struct pci_dev * pci_dev; | |
312 | acpi_integer addr; | |
313 | ||
314 | pci_dev = to_pci_dev(dev); | |
315 | /* Please ref to ACPI spec for the syntax of _ADR */ | |
316 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); | |
317 | *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); | |
318 | if (!*handle) | |
319 | return -ENODEV; | |
320 | return 0; | |
321 | } | |
322 | ||
9c273b95 | 323 | static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle) |
84df749f DSL |
324 | { |
325 | int num; | |
326 | unsigned int seg, bus; | |
327 | ||
328 | /* | |
329 | * The string should be the same as root bridge's name | |
330 | * Please look at 'pci_scan_bus_parented' | |
331 | */ | |
332 | num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus); | |
333 | if (num != 2) | |
334 | return -ENODEV; | |
335 | *handle = acpi_get_pci_rootbridge_handle(seg, bus); | |
336 | if (!*handle) | |
337 | return -ENODEV; | |
338 | return 0; | |
339 | } | |
340 | ||
9c273b95 | 341 | static struct acpi_bus_type acpi_pci_bus = { |
84df749f | 342 | .bus = &pci_bus_type, |
9c273b95 MK |
343 | .find_device = acpi_pci_find_device, |
344 | .find_bridge = acpi_pci_find_root_bridge, | |
84df749f DSL |
345 | }; |
346 | ||
9c273b95 | 347 | static int __init acpi_pci_init(void) |
84df749f DSL |
348 | { |
349 | int ret; | |
350 | ||
f8993aff SL |
351 | if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) { |
352 | printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n"); | |
353 | pci_no_msi(); | |
354 | } | |
9c273b95 | 355 | ret = register_acpi_bus_type(&acpi_pci_bus); |
84df749f DSL |
356 | if (ret) |
357 | return 0; | |
961d9120 | 358 | pci_set_platform_pm(&acpi_pci_platform_pm); |
84df749f DSL |
359 | return 0; |
360 | } | |
9c273b95 | 361 | arch_initcall(acpi_pci_init); |