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; | |
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 | ||
bc56b9e0 | 54 | static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66}; |
1da177e4 | 55 | |
8a7a4faf | 56 | static acpi_status acpi_run_osc(acpi_handle handle, |
5e0b9947 | 57 | struct acpi_osc_args *osc_args) |
1da177e4 | 58 | { |
8a7a4faf KK |
59 | acpi_status status; |
60 | struct acpi_object_list input; | |
61 | union acpi_object in_params[4]; | |
62 | struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; | |
63 | union acpi_object *out_obj; | |
5e0b9947 | 64 | u32 osc_dw0, flags = osc_args->capbuf[OSC_QUERY_TYPE]; |
1da177e4 | 65 | |
1da177e4 LT |
66 | /* Setting up input parameters */ |
67 | input.count = 4; | |
68 | input.pointer = in_params; | |
69 | in_params[0].type = ACPI_TYPE_BUFFER; | |
70 | in_params[0].buffer.length = 16; | |
71 | in_params[0].buffer.pointer = OSC_UUID; | |
72 | in_params[1].type = ACPI_TYPE_INTEGER; | |
73 | in_params[1].integer.value = 1; | |
74 | in_params[2].type = ACPI_TYPE_INTEGER; | |
75 | in_params[2].integer.value = 3; | |
76 | in_params[3].type = ACPI_TYPE_BUFFER; | |
77 | in_params[3].buffer.length = 12; | |
5e0b9947 | 78 | in_params[3].buffer.pointer = (u8 *)osc_args->capbuf; |
1da177e4 LT |
79 | |
80 | status = acpi_evaluate_object(handle, "_OSC", &input, &output); | |
a5d1c879 | 81 | if (ACPI_FAILURE(status)) |
8a7a4faf | 82 | return status; |
593ee207 | 83 | |
8a7a4faf | 84 | out_obj = output.pointer; |
593ee207 | 85 | if (out_obj->type != ACPI_TYPE_BUFFER) { |
8a7a4faf | 86 | printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n"); |
593ee207 | 87 | status = AE_TYPE; |
8a7a4faf | 88 | goto out_kfree; |
1da177e4 | 89 | } |
593ee207 | 90 | osc_dw0 = *((u32 *) out_obj->buffer.pointer); |
1da177e4 LT |
91 | if (osc_dw0) { |
92 | if (osc_dw0 & OSC_REQUEST_ERROR) | |
93 | printk(KERN_DEBUG "_OSC request fails\n"); | |
94 | if (osc_dw0 & OSC_INVALID_UUID_ERROR) | |
95 | printk(KERN_DEBUG "_OSC invalid UUID\n"); | |
96 | if (osc_dw0 & OSC_INVALID_REVISION_ERROR) | |
97 | printk(KERN_DEBUG "_OSC invalid revision\n"); | |
98 | if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) { | |
8a7a4faf KK |
99 | if (flags & OSC_QUERY_ENABLE) |
100 | goto out_success; | |
101 | printk(KERN_DEBUG "_OSC FW not grant req. control\n"); | |
102 | status = AE_SUPPORT; | |
103 | goto out_kfree; | |
1da177e4 | 104 | } |
593ee207 | 105 | status = AE_ERROR; |
8a7a4faf KK |
106 | goto out_kfree; |
107 | } | |
108 | out_success: | |
5e0b9947 KK |
109 | if (flags & OSC_QUERY_ENABLE) |
110 | osc_args->query_result = | |
8a7a4faf | 111 | *((u32 *)(out_obj->buffer.pointer + 8)); |
593ee207 KA |
112 | status = AE_OK; |
113 | ||
8a7a4faf | 114 | out_kfree: |
593ee207 KA |
115 | kfree(output.pointer); |
116 | return status; | |
1da177e4 LT |
117 | } |
118 | ||
8a7a4faf KK |
119 | static acpi_status acpi_query_osc(acpi_handle handle, |
120 | u32 level, void *context, void **retval) | |
1da177e4 | 121 | { |
8a7a4faf | 122 | acpi_status status; |
8a7a4faf | 123 | struct acpi_osc_data *osc_data; |
5e0b9947 | 124 | u32 flags = (unsigned long)context, support_set; |
8a7a4faf | 125 | acpi_handle tmp; |
5e0b9947 | 126 | struct acpi_osc_args osc_args; |
1da177e4 | 127 | |
8a7a4faf KK |
128 | status = acpi_get_handle(handle, "_OSC", &tmp); |
129 | if (ACPI_FAILURE(status)) | |
1da177e4 | 130 | return status; |
8d29bfb7 | 131 | |
8a7a4faf KK |
132 | osc_data = acpi_get_osc_data(handle); |
133 | if (!osc_data) { | |
134 | printk(KERN_ERR "acpi osc data array is full\n"); | |
135 | return AE_ERROR; | |
1da177e4 | 136 | } |
8a7a4faf | 137 | |
8a7a4faf | 138 | /* do _OSC query for all possible controls */ |
5e0b9947 KK |
139 | support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS); |
140 | osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; | |
141 | osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set; | |
142 | osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS; | |
8a7a4faf | 143 | |
5e0b9947 | 144 | status = acpi_run_osc(handle, &osc_args); |
5e0b9947 KK |
145 | if (ACPI_SUCCESS(status)) { |
146 | osc_data->support_set = support_set; | |
147 | osc_data->query_result = osc_args.query_result; | |
681f7d9d | 148 | osc_data->is_queried = 1; |
1da177e4 | 149 | } |
593ee207 | 150 | |
593ee207 | 151 | return status; |
1da177e4 LT |
152 | } |
153 | ||
154 | /** | |
c2778357 | 155 | * __pci_osc_support_set - register OS support to Firmware |
1da177e4 | 156 | * @flags: OS support bits |
5958f1a4 | 157 | * @hid: hardware ID |
1da177e4 LT |
158 | * |
159 | * Update OS support fields and doing a _OSC Query to obtain an update | |
160 | * from Firmware on supported control bits. | |
161 | **/ | |
c2778357 | 162 | acpi_status __pci_osc_support_set(u32 flags, const char *hid) |
1da177e4 | 163 | { |
c155062d | 164 | if (!(flags & OSC_SUPPORT_MASKS)) |
1da177e4 | 165 | return AE_TYPE; |
c155062d KK |
166 | |
167 | acpi_get_devices(hid, acpi_query_osc, | |
168 | (void *)(unsigned long)flags, NULL); | |
1da177e4 LT |
169 | return AE_OK; |
170 | } | |
1da177e4 LT |
171 | |
172 | /** | |
173 | * pci_osc_control_set - commit requested control to Firmware | |
f366633f | 174 | * @handle: acpi_handle for the target ACPI object |
1da177e4 LT |
175 | * @flags: driver's requested control bits |
176 | * | |
177 | * Attempt to take control from Firmware on requested control bits. | |
178 | **/ | |
427bf532 | 179 | acpi_status pci_osc_control_set(acpi_handle handle, u32 flags) |
1da177e4 | 180 | { |
5e0b9947 KK |
181 | acpi_status status; |
182 | u32 ctrlset, control_set; | |
34a65055 KK |
183 | acpi_handle tmp; |
184 | struct acpi_osc_data *osc_data; | |
5e0b9947 | 185 | struct acpi_osc_args osc_args; |
34a65055 KK |
186 | |
187 | status = acpi_get_handle(handle, "_OSC", &tmp); | |
188 | if (ACPI_FAILURE(status)) | |
189 | return status; | |
a5d1c879 | 190 | |
34a65055 | 191 | osc_data = acpi_get_osc_data(handle); |
a5d1c879 SL |
192 | if (!osc_data) { |
193 | printk(KERN_ERR "acpi osc data array is full\n"); | |
194 | return AE_ERROR; | |
195 | } | |
1da177e4 LT |
196 | |
197 | ctrlset = (flags & OSC_CONTROL_MASKS); | |
5e0b9947 | 198 | if (!ctrlset) |
1da177e4 | 199 | return AE_TYPE; |
5e0b9947 | 200 | |
681f7d9d | 201 | if (osc_data->is_queried && |
5e0b9947 | 202 | ((osc_data->query_result & ctrlset) != ctrlset)) |
1da177e4 | 203 | return AE_SUPPORT; |
5e0b9947 KK |
204 | |
205 | control_set = osc_data->control_set | ctrlset; | |
206 | osc_args.capbuf[OSC_QUERY_TYPE] = 0; | |
207 | osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set; | |
208 | osc_args.capbuf[OSC_CONTROL_TYPE] = control_set; | |
209 | status = acpi_run_osc(handle, &osc_args); | |
210 | if (ACPI_SUCCESS(status)) | |
211 | osc_data->control_set = control_set; | |
212 | ||
1da177e4 LT |
213 | return status; |
214 | } | |
215 | EXPORT_SYMBOL(pci_osc_control_set); | |
84df749f | 216 | |
673d5b43 | 217 | #ifdef CONFIG_ACPI_SLEEP |
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 | ||
ab826ca4 SL |
241 | static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev, |
242 | pm_message_t state) | |
0f64474b | 243 | { |
ab826ca4 | 244 | int acpi_state; |
0f64474b | 245 | |
ab826ca4 SL |
246 | acpi_state = acpi_pm_device_sleep_state(&pdev->dev, |
247 | device_may_wakeup(&pdev->dev), NULL); | |
248 | if (acpi_state < 0) | |
249 | return PCI_POWER_ERROR; | |
250 | ||
251 | switch (acpi_state) { | |
252 | case ACPI_STATE_D0: | |
253 | return PCI_D0; | |
254 | case ACPI_STATE_D1: | |
255 | return PCI_D1; | |
256 | case ACPI_STATE_D2: | |
257 | return PCI_D2; | |
258 | case ACPI_STATE_D3: | |
259 | return PCI_D3hot; | |
260 | } | |
261 | return PCI_POWER_ERROR; | |
0f64474b | 262 | } |
673d5b43 | 263 | #endif |
0f64474b | 264 | |
b913100d DSL |
265 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
266 | { | |
267 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
10b3dcae | 268 | acpi_handle tmp; |
583c377f DB |
269 | static const u8 state_conv[] = { |
270 | [PCI_D0] = ACPI_STATE_D0, | |
271 | [PCI_D1] = ACPI_STATE_D1, | |
272 | [PCI_D2] = ACPI_STATE_D2, | |
273 | [PCI_D3hot] = ACPI_STATE_D3, | |
274 | [PCI_D3cold] = ACPI_STATE_D3 | |
b913100d | 275 | }; |
b913100d DSL |
276 | |
277 | if (!handle) | |
278 | return -ENODEV; | |
10b3dcae SL |
279 | /* If the ACPI device has _EJ0, ignore the device */ |
280 | if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) | |
281 | return 0; | |
583c377f DB |
282 | |
283 | switch (state) { | |
284 | case PCI_D0: | |
285 | case PCI_D1: | |
286 | case PCI_D2: | |
287 | case PCI_D3hot: | |
288 | case PCI_D3cold: | |
289 | return acpi_bus_set_power(handle, state_conv[state]); | |
290 | } | |
291 | return -EINVAL; | |
b913100d DSL |
292 | } |
293 | ||
294 | ||
84df749f | 295 | /* ACPI bus type */ |
9c273b95 | 296 | static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) |
84df749f DSL |
297 | { |
298 | struct pci_dev * pci_dev; | |
299 | acpi_integer addr; | |
300 | ||
301 | pci_dev = to_pci_dev(dev); | |
302 | /* Please ref to ACPI spec for the syntax of _ADR */ | |
303 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); | |
304 | *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); | |
305 | if (!*handle) | |
306 | return -ENODEV; | |
307 | return 0; | |
308 | } | |
309 | ||
9c273b95 | 310 | static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle) |
84df749f DSL |
311 | { |
312 | int num; | |
313 | unsigned int seg, bus; | |
314 | ||
315 | /* | |
316 | * The string should be the same as root bridge's name | |
317 | * Please look at 'pci_scan_bus_parented' | |
318 | */ | |
319 | num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus); | |
320 | if (num != 2) | |
321 | return -ENODEV; | |
322 | *handle = acpi_get_pci_rootbridge_handle(seg, bus); | |
323 | if (!*handle) | |
324 | return -ENODEV; | |
325 | return 0; | |
326 | } | |
327 | ||
9c273b95 | 328 | static struct acpi_bus_type acpi_pci_bus = { |
84df749f | 329 | .bus = &pci_bus_type, |
9c273b95 MK |
330 | .find_device = acpi_pci_find_device, |
331 | .find_bridge = acpi_pci_find_root_bridge, | |
84df749f DSL |
332 | }; |
333 | ||
9c273b95 | 334 | static int __init acpi_pci_init(void) |
84df749f DSL |
335 | { |
336 | int ret; | |
337 | ||
f8993aff SL |
338 | if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) { |
339 | printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n"); | |
340 | pci_no_msi(); | |
341 | } | |
9c273b95 | 342 | ret = register_acpi_bus_type(&acpi_pci_bus); |
84df749f DSL |
343 | if (ret) |
344 | return 0; | |
673d5b43 | 345 | #ifdef CONFIG_ACPI_SLEEP |
0f64474b | 346 | platform_pci_choose_state = acpi_pci_choose_state; |
673d5b43 | 347 | #endif |
b913100d | 348 | platform_pci_set_power_state = acpi_pci_set_power_state; |
84df749f DSL |
349 | return 0; |
350 | } | |
9c273b95 | 351 | arch_initcall(acpi_pci_init); |