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> | |
5fde244d | 14 | #include <linux/pci-aspm.h> |
1da177e4 LT |
15 | #include <acpi/acpi.h> |
16 | #include <acpi/acnamesp.h> | |
17 | #include <acpi/acresrc.h> | |
18 | #include <acpi/acpi_bus.h> | |
19 | ||
20 | #include <linux/pci-acpi.h> | |
0f64474b | 21 | #include "pci.h" |
1da177e4 | 22 | |
a5d1c879 SL |
23 | struct acpi_osc_data { |
24 | acpi_handle handle; | |
5e0b9947 KK |
25 | u32 support_set; |
26 | u32 control_set; | |
a5d1c879 SL |
27 | struct list_head sibiling; |
28 | }; | |
29 | static LIST_HEAD(acpi_osc_data_list); | |
30 | ||
5e0b9947 KK |
31 | struct acpi_osc_args { |
32 | u32 capbuf[3]; | |
adf411b8 | 33 | u32 ctrl_result; |
5e0b9947 KK |
34 | }; |
35 | ||
9778c14b TI |
36 | static DEFINE_MUTEX(pci_acpi_lock); |
37 | ||
a5d1c879 SL |
38 | static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle) |
39 | { | |
40 | struct acpi_osc_data *data; | |
41 | ||
42 | list_for_each_entry(data, &acpi_osc_data_list, sibiling) { | |
43 | if (data->handle == handle) | |
44 | return data; | |
45 | } | |
46 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
47 | if (!data) | |
48 | return NULL; | |
49 | INIT_LIST_HEAD(&data->sibiling); | |
50 | data->handle = handle; | |
51 | list_add_tail(&data->sibiling, &acpi_osc_data_list); | |
52 | return data; | |
53 | } | |
54 | ||
90a57dab KK |
55 | static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, |
56 | 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66}; | |
1da177e4 | 57 | |
8a7a4faf | 58 | static acpi_status acpi_run_osc(acpi_handle handle, |
5e0b9947 | 59 | struct acpi_osc_args *osc_args) |
1da177e4 | 60 | { |
8a7a4faf KK |
61 | acpi_status status; |
62 | struct acpi_object_list input; | |
63 | union acpi_object in_params[4]; | |
64 | struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; | |
65 | union acpi_object *out_obj; | |
2485b867 | 66 | u32 errors, flags = osc_args->capbuf[OSC_QUERY_TYPE]; |
1da177e4 | 67 | |
1da177e4 LT |
68 | /* Setting up input parameters */ |
69 | input.count = 4; | |
70 | input.pointer = in_params; | |
71 | in_params[0].type = ACPI_TYPE_BUFFER; | |
72 | in_params[0].buffer.length = 16; | |
73 | in_params[0].buffer.pointer = OSC_UUID; | |
74 | in_params[1].type = ACPI_TYPE_INTEGER; | |
75 | in_params[1].integer.value = 1; | |
76 | in_params[2].type = ACPI_TYPE_INTEGER; | |
77 | in_params[2].integer.value = 3; | |
78 | in_params[3].type = ACPI_TYPE_BUFFER; | |
79 | in_params[3].buffer.length = 12; | |
5e0b9947 | 80 | in_params[3].buffer.pointer = (u8 *)osc_args->capbuf; |
1da177e4 LT |
81 | |
82 | status = acpi_evaluate_object(handle, "_OSC", &input, &output); | |
a5d1c879 | 83 | if (ACPI_FAILURE(status)) |
8a7a4faf | 84 | return status; |
593ee207 | 85 | |
f8123381 RW |
86 | if (!output.length) |
87 | return AE_NULL_OBJECT; | |
88 | ||
8a7a4faf | 89 | out_obj = output.pointer; |
593ee207 | 90 | if (out_obj->type != ACPI_TYPE_BUFFER) { |
8a7a4faf | 91 | printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n"); |
593ee207 | 92 | status = AE_TYPE; |
8a7a4faf | 93 | goto out_kfree; |
1da177e4 | 94 | } |
2485b867 KK |
95 | /* Need to ignore the bit0 in result code */ |
96 | errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); | |
97 | if (errors) { | |
98 | if (errors & OSC_REQUEST_ERROR) | |
1da177e4 | 99 | printk(KERN_DEBUG "_OSC request fails\n"); |
2485b867 | 100 | if (errors & OSC_INVALID_UUID_ERROR) |
1da177e4 | 101 | printk(KERN_DEBUG "_OSC invalid UUID\n"); |
2485b867 | 102 | if (errors & OSC_INVALID_REVISION_ERROR) |
1da177e4 | 103 | printk(KERN_DEBUG "_OSC invalid revision\n"); |
2485b867 | 104 | if (errors & OSC_CAPABILITIES_MASK_ERROR) { |
8a7a4faf KK |
105 | if (flags & OSC_QUERY_ENABLE) |
106 | goto out_success; | |
107 | printk(KERN_DEBUG "_OSC FW not grant req. control\n"); | |
108 | status = AE_SUPPORT; | |
109 | goto out_kfree; | |
1da177e4 | 110 | } |
593ee207 | 111 | status = AE_ERROR; |
8a7a4faf KK |
112 | goto out_kfree; |
113 | } | |
114 | out_success: | |
adf411b8 TI |
115 | osc_args->ctrl_result = |
116 | *((u32 *)(out_obj->buffer.pointer + 8)); | |
593ee207 KA |
117 | status = AE_OK; |
118 | ||
8a7a4faf | 119 | out_kfree: |
593ee207 KA |
120 | kfree(output.pointer); |
121 | return status; | |
1da177e4 LT |
122 | } |
123 | ||
adf411b8 TI |
124 | static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data, |
125 | u32 *result) | |
4e39432f TI |
126 | { |
127 | acpi_status status; | |
128 | u32 support_set; | |
129 | struct acpi_osc_args osc_args; | |
130 | ||
131 | /* do _OSC query for all possible controls */ | |
132 | support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS); | |
133 | osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; | |
134 | osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set; | |
135 | osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS; | |
136 | ||
137 | status = acpi_run_osc(osc_data->handle, &osc_args); | |
138 | if (ACPI_SUCCESS(status)) { | |
139 | osc_data->support_set = support_set; | |
adf411b8 | 140 | *result = osc_args.ctrl_result; |
4e39432f TI |
141 | } |
142 | ||
143 | return status; | |
144 | } | |
145 | ||
8a7a4faf KK |
146 | static acpi_status acpi_query_osc(acpi_handle handle, |
147 | u32 level, void *context, void **retval) | |
1da177e4 | 148 | { |
8a7a4faf | 149 | acpi_status status; |
8a7a4faf | 150 | struct acpi_osc_data *osc_data; |
adf411b8 | 151 | u32 flags = (unsigned long)context, dummy; |
8a7a4faf | 152 | acpi_handle tmp; |
1da177e4 | 153 | |
8a7a4faf KK |
154 | status = acpi_get_handle(handle, "_OSC", &tmp); |
155 | if (ACPI_FAILURE(status)) | |
ab20440c | 156 | return AE_OK; |
8d29bfb7 | 157 | |
9778c14b | 158 | mutex_lock(&pci_acpi_lock); |
8a7a4faf KK |
159 | osc_data = acpi_get_osc_data(handle); |
160 | if (!osc_data) { | |
161 | printk(KERN_ERR "acpi osc data array is full\n"); | |
9778c14b | 162 | goto out; |
1da177e4 | 163 | } |
8a7a4faf | 164 | |
ab20440c | 165 | __acpi_query_osc(flags, osc_data, &dummy); |
9778c14b TI |
166 | out: |
167 | mutex_unlock(&pci_acpi_lock); | |
ab20440c | 168 | return AE_OK; |
1da177e4 LT |
169 | } |
170 | ||
171 | /** | |
c2778357 | 172 | * __pci_osc_support_set - register OS support to Firmware |
1da177e4 | 173 | * @flags: OS support bits |
5958f1a4 | 174 | * @hid: hardware ID |
1da177e4 LT |
175 | * |
176 | * Update OS support fields and doing a _OSC Query to obtain an update | |
177 | * from Firmware on supported control bits. | |
178 | **/ | |
c2778357 | 179 | acpi_status __pci_osc_support_set(u32 flags, const char *hid) |
1da177e4 | 180 | { |
c155062d | 181 | if (!(flags & OSC_SUPPORT_MASKS)) |
1da177e4 | 182 | return AE_TYPE; |
c155062d KK |
183 | |
184 | acpi_get_devices(hid, acpi_query_osc, | |
185 | (void *)(unsigned long)flags, NULL); | |
1da177e4 LT |
186 | return AE_OK; |
187 | } | |
1da177e4 LT |
188 | |
189 | /** | |
190 | * pci_osc_control_set - commit requested control to Firmware | |
f366633f | 191 | * @handle: acpi_handle for the target ACPI object |
1da177e4 LT |
192 | * @flags: driver's requested control bits |
193 | * | |
194 | * Attempt to take control from Firmware on requested control bits. | |
195 | **/ | |
427bf532 | 196 | acpi_status pci_osc_control_set(acpi_handle handle, u32 flags) |
1da177e4 | 197 | { |
5e0b9947 | 198 | acpi_status status; |
adf411b8 | 199 | u32 ctrlset, control_set, result; |
34a65055 KK |
200 | acpi_handle tmp; |
201 | struct acpi_osc_data *osc_data; | |
5e0b9947 | 202 | struct acpi_osc_args osc_args; |
34a65055 KK |
203 | |
204 | status = acpi_get_handle(handle, "_OSC", &tmp); | |
205 | if (ACPI_FAILURE(status)) | |
206 | return status; | |
a5d1c879 | 207 | |
9778c14b | 208 | mutex_lock(&pci_acpi_lock); |
34a65055 | 209 | osc_data = acpi_get_osc_data(handle); |
a5d1c879 SL |
210 | if (!osc_data) { |
211 | printk(KERN_ERR "acpi osc data array is full\n"); | |
9778c14b TI |
212 | status = AE_ERROR; |
213 | goto out; | |
a5d1c879 | 214 | } |
1da177e4 LT |
215 | |
216 | ctrlset = (flags & OSC_CONTROL_MASKS); | |
9778c14b TI |
217 | if (!ctrlset) { |
218 | status = AE_TYPE; | |
219 | goto out; | |
220 | } | |
5e0b9947 | 221 | |
adf411b8 TI |
222 | status = __acpi_query_osc(osc_data->support_set, osc_data, &result); |
223 | if (ACPI_FAILURE(status)) | |
224 | goto out; | |
4e39432f | 225 | |
adf411b8 | 226 | if ((result & ctrlset) != ctrlset) { |
9778c14b TI |
227 | status = AE_SUPPORT; |
228 | goto out; | |
229 | } | |
5e0b9947 KK |
230 | |
231 | control_set = osc_data->control_set | ctrlset; | |
232 | osc_args.capbuf[OSC_QUERY_TYPE] = 0; | |
233 | osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set; | |
234 | osc_args.capbuf[OSC_CONTROL_TYPE] = control_set; | |
235 | status = acpi_run_osc(handle, &osc_args); | |
236 | if (ACPI_SUCCESS(status)) | |
237 | osc_data->control_set = control_set; | |
9778c14b TI |
238 | out: |
239 | mutex_unlock(&pci_acpi_lock); | |
1da177e4 LT |
240 | return status; |
241 | } | |
242 | EXPORT_SYMBOL(pci_osc_control_set); | |
84df749f | 243 | |
0f64474b DSL |
244 | /* |
245 | * _SxD returns the D-state with the highest power | |
246 | * (lowest D-state number) supported in the S-state "x". | |
247 | * | |
248 | * If the devices does not have a _PRW | |
249 | * (Power Resources for Wake) supporting system wakeup from "x" | |
250 | * then the OS is free to choose a lower power (higher number | |
251 | * D-state) than the return value from _SxD. | |
252 | * | |
253 | * But if _PRW is enabled at S-state "x", the OS | |
254 | * must not choose a power lower than _SxD -- | |
255 | * unless the device has an _SxW method specifying | |
256 | * the lowest power (highest D-state number) the device | |
257 | * may enter while still able to wake the system. | |
258 | * | |
259 | * ie. depending on global OS policy: | |
260 | * | |
261 | * if (_PRW at S-state x) | |
262 | * choose from highest power _SxD to lowest power _SxW | |
263 | * else // no _PRW at S-state x | |
264 | * choose highest power _SxD or any lower power | |
0f64474b DSL |
265 | */ |
266 | ||
8d2bdf49 | 267 | static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) |
0f64474b | 268 | { |
ab826ca4 | 269 | int acpi_state; |
0f64474b | 270 | |
06166780 | 271 | acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL); |
ab826ca4 SL |
272 | if (acpi_state < 0) |
273 | return PCI_POWER_ERROR; | |
274 | ||
275 | switch (acpi_state) { | |
276 | case ACPI_STATE_D0: | |
277 | return PCI_D0; | |
278 | case ACPI_STATE_D1: | |
279 | return PCI_D1; | |
280 | case ACPI_STATE_D2: | |
281 | return PCI_D2; | |
282 | case ACPI_STATE_D3: | |
283 | return PCI_D3hot; | |
284 | } | |
285 | return PCI_POWER_ERROR; | |
0f64474b | 286 | } |
961d9120 RW |
287 | |
288 | static bool acpi_pci_power_manageable(struct pci_dev *dev) | |
289 | { | |
290 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
291 | ||
292 | return handle ? acpi_bus_power_manageable(handle) : false; | |
293 | } | |
0f64474b | 294 | |
b913100d DSL |
295 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
296 | { | |
297 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
10b3dcae | 298 | acpi_handle tmp; |
583c377f DB |
299 | static const u8 state_conv[] = { |
300 | [PCI_D0] = ACPI_STATE_D0, | |
301 | [PCI_D1] = ACPI_STATE_D1, | |
302 | [PCI_D2] = ACPI_STATE_D2, | |
303 | [PCI_D3hot] = ACPI_STATE_D3, | |
304 | [PCI_D3cold] = ACPI_STATE_D3 | |
b913100d | 305 | }; |
44e4e66e | 306 | int error = -EINVAL; |
b913100d | 307 | |
10b3dcae | 308 | /* If the ACPI device has _EJ0, ignore the device */ |
44e4e66e RW |
309 | if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) |
310 | return -ENODEV; | |
583c377f DB |
311 | |
312 | switch (state) { | |
313 | case PCI_D0: | |
314 | case PCI_D1: | |
315 | case PCI_D2: | |
316 | case PCI_D3hot: | |
317 | case PCI_D3cold: | |
44e4e66e | 318 | error = acpi_bus_set_power(handle, state_conv[state]); |
583c377f | 319 | } |
44e4e66e RW |
320 | |
321 | if (!error) | |
322 | dev_printk(KERN_INFO, &dev->dev, | |
323 | "power state changed by ACPI to D%d\n", state); | |
324 | ||
325 | return error; | |
b913100d DSL |
326 | } |
327 | ||
eb9d0fe4 RW |
328 | static bool acpi_pci_can_wakeup(struct pci_dev *dev) |
329 | { | |
330 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
331 | ||
332 | return handle ? acpi_bus_can_wakeup(handle) : false; | |
333 | } | |
334 | ||
335 | static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable) | |
336 | { | |
337 | int error = acpi_pm_device_sleep_wake(&dev->dev, enable); | |
338 | ||
339 | if (!error) | |
340 | dev_printk(KERN_INFO, &dev->dev, | |
341 | "wake-up capability %s by ACPI\n", | |
342 | enable ? "enabled" : "disabled"); | |
343 | return error; | |
344 | } | |
345 | ||
961d9120 RW |
346 | static struct pci_platform_pm_ops acpi_pci_platform_pm = { |
347 | .is_manageable = acpi_pci_power_manageable, | |
348 | .set_state = acpi_pci_set_power_state, | |
349 | .choose_state = acpi_pci_choose_state, | |
eb9d0fe4 RW |
350 | .can_wakeup = acpi_pci_can_wakeup, |
351 | .sleep_wake = acpi_pci_sleep_wake, | |
961d9120 | 352 | }; |
b913100d | 353 | |
84df749f | 354 | /* ACPI bus type */ |
9c273b95 | 355 | static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) |
84df749f DSL |
356 | { |
357 | struct pci_dev * pci_dev; | |
358 | acpi_integer addr; | |
359 | ||
360 | pci_dev = to_pci_dev(dev); | |
361 | /* Please ref to ACPI spec for the syntax of _ADR */ | |
362 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); | |
363 | *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); | |
364 | if (!*handle) | |
365 | return -ENODEV; | |
366 | return 0; | |
367 | } | |
368 | ||
9c273b95 | 369 | static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle) |
84df749f DSL |
370 | { |
371 | int num; | |
372 | unsigned int seg, bus; | |
373 | ||
374 | /* | |
375 | * The string should be the same as root bridge's name | |
376 | * Please look at 'pci_scan_bus_parented' | |
377 | */ | |
378 | num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus); | |
379 | if (num != 2) | |
380 | return -ENODEV; | |
381 | *handle = acpi_get_pci_rootbridge_handle(seg, bus); | |
382 | if (!*handle) | |
383 | return -ENODEV; | |
384 | return 0; | |
385 | } | |
386 | ||
9c273b95 | 387 | static struct acpi_bus_type acpi_pci_bus = { |
84df749f | 388 | .bus = &pci_bus_type, |
9c273b95 MK |
389 | .find_device = acpi_pci_find_device, |
390 | .find_bridge = acpi_pci_find_root_bridge, | |
84df749f DSL |
391 | }; |
392 | ||
9c273b95 | 393 | static int __init acpi_pci_init(void) |
84df749f DSL |
394 | { |
395 | int ret; | |
396 | ||
f8993aff SL |
397 | if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) { |
398 | printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n"); | |
399 | pci_no_msi(); | |
400 | } | |
5fde244d SL |
401 | |
402 | if (acpi_gbl_FADT.boot_flags & BAF_PCIE_ASPM_CONTROL) { | |
403 | printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n"); | |
404 | pcie_no_aspm(); | |
405 | } | |
406 | ||
9c273b95 | 407 | ret = register_acpi_bus_type(&acpi_pci_bus); |
84df749f DSL |
408 | if (ret) |
409 | return 0; | |
961d9120 | 410 | pci_set_platform_pm(&acpi_pci_platform_pm); |
84df749f DSL |
411 | return 0; |
412 | } | |
9c273b95 | 413 | arch_initcall(acpi_pci_init); |