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 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]; | |
593ee207 KA |
36 | struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; |
37 | union acpi_object *out_obj; | |
1da177e4 | 38 | u32 osc_dw0; |
0dcb2b7e | 39 | acpi_status *ret_status = (acpi_status *)retval; |
1da177e4 | 40 | |
1da177e4 LT |
41 | |
42 | /* Setting up input parameters */ | |
43 | input.count = 4; | |
44 | input.pointer = in_params; | |
45 | in_params[0].type = ACPI_TYPE_BUFFER; | |
46 | in_params[0].buffer.length = 16; | |
47 | in_params[0].buffer.pointer = OSC_UUID; | |
48 | in_params[1].type = ACPI_TYPE_INTEGER; | |
49 | in_params[1].integer.value = 1; | |
50 | in_params[2].type = ACPI_TYPE_INTEGER; | |
51 | in_params[2].integer.value = 3; | |
52 | in_params[3].type = ACPI_TYPE_BUFFER; | |
53 | in_params[3].buffer.length = 12; | |
54 | in_params[3].buffer.pointer = (u8 *)context; | |
55 | ||
56 | status = acpi_evaluate_object(handle, "_OSC", &input, &output); | |
57 | if (ACPI_FAILURE (status)) { | |
58 | printk(KERN_DEBUG | |
59 | "Evaluate _OSC Set fails. Status = 0x%04x\n", status); | |
0dcb2b7e | 60 | *ret_status = status; |
1da177e4 LT |
61 | return status; |
62 | } | |
593ee207 KA |
63 | out_obj = output.pointer; |
64 | ||
65 | if (out_obj->type != ACPI_TYPE_BUFFER) { | |
1da177e4 LT |
66 | printk(KERN_DEBUG |
67 | "Evaluate _OSC returns wrong type\n"); | |
593ee207 KA |
68 | status = AE_TYPE; |
69 | goto query_osc_out; | |
1da177e4 | 70 | } |
593ee207 | 71 | osc_dw0 = *((u32 *) out_obj->buffer.pointer); |
1da177e4 LT |
72 | if (osc_dw0) { |
73 | if (osc_dw0 & OSC_REQUEST_ERROR) | |
74 | printk(KERN_DEBUG "_OSC request fails\n"); | |
75 | if (osc_dw0 & OSC_INVALID_UUID_ERROR) | |
76 | printk(KERN_DEBUG "_OSC invalid UUID\n"); | |
77 | if (osc_dw0 & OSC_INVALID_REVISION_ERROR) | |
78 | printk(KERN_DEBUG "_OSC invalid revision\n"); | |
79 | if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) { | |
80 | /* Update Global Control Set */ | |
593ee207 KA |
81 | global_ctrlsets = *((u32 *)(out_obj->buffer.pointer+8)); |
82 | status = AE_OK; | |
83 | goto query_osc_out; | |
1da177e4 | 84 | } |
593ee207 KA |
85 | status = AE_ERROR; |
86 | goto query_osc_out; | |
1da177e4 LT |
87 | } |
88 | ||
89 | /* Update Global Control Set */ | |
593ee207 KA |
90 | global_ctrlsets = *((u32 *)(out_obj->buffer.pointer + 8)); |
91 | status = AE_OK; | |
92 | ||
93 | query_osc_out: | |
94 | kfree(output.pointer); | |
0dcb2b7e | 95 | *ret_status = status; |
593ee207 | 96 | return status; |
1da177e4 LT |
97 | } |
98 | ||
99 | ||
100 | static acpi_status | |
101 | acpi_run_osc ( | |
102 | acpi_handle handle, | |
427bf532 | 103 | void *context) |
1da177e4 LT |
104 | { |
105 | acpi_status status; | |
106 | struct acpi_object_list input; | |
107 | union acpi_object in_params[4]; | |
593ee207 KA |
108 | struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; |
109 | union acpi_object *out_obj; | |
1da177e4 LT |
110 | u32 osc_dw0; |
111 | ||
1da177e4 LT |
112 | /* Setting up input parameters */ |
113 | input.count = 4; | |
114 | input.pointer = in_params; | |
115 | in_params[0].type = ACPI_TYPE_BUFFER; | |
116 | in_params[0].buffer.length = 16; | |
117 | in_params[0].buffer.pointer = OSC_UUID; | |
118 | in_params[1].type = ACPI_TYPE_INTEGER; | |
119 | in_params[1].integer.value = 1; | |
120 | in_params[2].type = ACPI_TYPE_INTEGER; | |
121 | in_params[2].integer.value = 3; | |
122 | in_params[3].type = ACPI_TYPE_BUFFER; | |
123 | in_params[3].buffer.length = 12; | |
124 | in_params[3].buffer.pointer = (u8 *)context; | |
125 | ||
126 | status = acpi_evaluate_object(handle, "_OSC", &input, &output); | |
127 | if (ACPI_FAILURE (status)) { | |
128 | printk(KERN_DEBUG | |
129 | "Evaluate _OSC Set fails. Status = 0x%04x\n", status); | |
130 | return status; | |
131 | } | |
593ee207 KA |
132 | out_obj = output.pointer; |
133 | if (out_obj->type != ACPI_TYPE_BUFFER) { | |
1da177e4 LT |
134 | printk(KERN_DEBUG |
135 | "Evaluate _OSC returns wrong type\n"); | |
593ee207 KA |
136 | status = AE_TYPE; |
137 | goto run_osc_out; | |
1da177e4 | 138 | } |
593ee207 | 139 | osc_dw0 = *((u32 *) out_obj->buffer.pointer); |
1da177e4 LT |
140 | if (osc_dw0) { |
141 | if (osc_dw0 & OSC_REQUEST_ERROR) | |
142 | printk(KERN_DEBUG "_OSC request fails\n"); | |
143 | if (osc_dw0 & OSC_INVALID_UUID_ERROR) | |
144 | printk(KERN_DEBUG "_OSC invalid UUID\n"); | |
145 | if (osc_dw0 & OSC_INVALID_REVISION_ERROR) | |
146 | printk(KERN_DEBUG "_OSC invalid revision\n"); | |
147 | if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) { | |
148 | printk(KERN_DEBUG "_OSC FW not grant req. control\n"); | |
593ee207 KA |
149 | status = AE_SUPPORT; |
150 | goto run_osc_out; | |
1da177e4 | 151 | } |
593ee207 KA |
152 | status = AE_ERROR; |
153 | goto run_osc_out; | |
1da177e4 | 154 | } |
593ee207 KA |
155 | status = AE_OK; |
156 | ||
157 | run_osc_out: | |
158 | kfree(output.pointer); | |
159 | return status; | |
1da177e4 LT |
160 | } |
161 | ||
162 | /** | |
163 | * pci_osc_support_set - register OS support to Firmware | |
164 | * @flags: OS support bits | |
165 | * | |
166 | * Update OS support fields and doing a _OSC Query to obtain an update | |
167 | * from Firmware on supported control bits. | |
168 | **/ | |
169 | acpi_status pci_osc_support_set(u32 flags) | |
170 | { | |
171 | u32 temp; | |
0dcb2b7e | 172 | acpi_status retval; |
1da177e4 LT |
173 | |
174 | if (!(flags & OSC_SUPPORT_MASKS)) { | |
175 | return AE_TYPE; | |
176 | } | |
177 | ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS); | |
178 | ||
179 | /* do _OSC query for all possible controls */ | |
180 | temp = ctrlset_buf[OSC_CONTROL_TYPE]; | |
181 | ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; | |
182 | ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS; | |
183 | acpi_get_devices ( PCI_ROOT_HID_STRING, | |
184 | acpi_query_osc, | |
185 | ctrlset_buf, | |
0dcb2b7e | 186 | (void **) &retval ); |
1da177e4 LT |
187 | ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE; |
188 | ctrlset_buf[OSC_CONTROL_TYPE] = temp; | |
0dcb2b7e KCA |
189 | if (ACPI_FAILURE(retval)) { |
190 | /* no osc support at all */ | |
191 | ctrlset_buf[OSC_SUPPORT_TYPE] = 0; | |
192 | } | |
1da177e4 LT |
193 | return AE_OK; |
194 | } | |
195 | EXPORT_SYMBOL(pci_osc_support_set); | |
196 | ||
197 | /** | |
198 | * pci_osc_control_set - commit requested control to Firmware | |
f366633f | 199 | * @handle: acpi_handle for the target ACPI object |
1da177e4 LT |
200 | * @flags: driver's requested control bits |
201 | * | |
202 | * Attempt to take control from Firmware on requested control bits. | |
203 | **/ | |
427bf532 | 204 | acpi_status pci_osc_control_set(acpi_handle handle, u32 flags) |
1da177e4 LT |
205 | { |
206 | acpi_status status; | |
207 | u32 ctrlset; | |
208 | ||
209 | ctrlset = (flags & OSC_CONTROL_MASKS); | |
210 | if (!ctrlset) { | |
211 | return AE_TYPE; | |
212 | } | |
213 | if (ctrlset_buf[OSC_SUPPORT_TYPE] && | |
214 | ((global_ctrlsets & ctrlset) != ctrlset)) { | |
215 | return AE_SUPPORT; | |
216 | } | |
217 | ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset; | |
427bf532 | 218 | status = acpi_run_osc(handle, ctrlset_buf); |
1da177e4 LT |
219 | if (ACPI_FAILURE (status)) { |
220 | ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset; | |
221 | } | |
222 | ||
223 | return status; | |
224 | } | |
225 | EXPORT_SYMBOL(pci_osc_control_set); | |
84df749f | 226 | |
0f64474b DSL |
227 | /* |
228 | * _SxD returns the D-state with the highest power | |
229 | * (lowest D-state number) supported in the S-state "x". | |
230 | * | |
231 | * If the devices does not have a _PRW | |
232 | * (Power Resources for Wake) supporting system wakeup from "x" | |
233 | * then the OS is free to choose a lower power (higher number | |
234 | * D-state) than the return value from _SxD. | |
235 | * | |
236 | * But if _PRW is enabled at S-state "x", the OS | |
237 | * must not choose a power lower than _SxD -- | |
238 | * unless the device has an _SxW method specifying | |
239 | * the lowest power (highest D-state number) the device | |
240 | * may enter while still able to wake the system. | |
241 | * | |
242 | * ie. depending on global OS policy: | |
243 | * | |
244 | * if (_PRW at S-state x) | |
245 | * choose from highest power _SxD to lowest power _SxW | |
246 | * else // no _PRW at S-state x | |
247 | * choose highest power _SxD or any lower power | |
248 | * | |
249 | * currently we simply return _SxD, if present. | |
250 | */ | |
251 | ||
252 | static int acpi_pci_choose_state(struct pci_dev *pdev, pm_message_t state) | |
253 | { | |
a406d9e6 | 254 | /* TBD */ |
0f64474b | 255 | |
0f64474b DSL |
256 | return -ENODEV; |
257 | } | |
258 | ||
b913100d DSL |
259 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
260 | { | |
261 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
262 | static int state_conv[] = { | |
263 | [0] = 0, | |
264 | [1] = 1, | |
265 | [2] = 2, | |
266 | [3] = 3, | |
267 | [4] = 3 | |
268 | }; | |
269 | int acpi_state = state_conv[(int __force) state]; | |
270 | ||
271 | if (!handle) | |
272 | return -ENODEV; | |
273 | return acpi_bus_set_power(handle, acpi_state); | |
274 | } | |
275 | ||
276 | ||
84df749f | 277 | /* ACPI bus type */ |
9c273b95 | 278 | static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) |
84df749f DSL |
279 | { |
280 | struct pci_dev * pci_dev; | |
281 | acpi_integer addr; | |
282 | ||
283 | pci_dev = to_pci_dev(dev); | |
284 | /* Please ref to ACPI spec for the syntax of _ADR */ | |
285 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); | |
286 | *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); | |
287 | if (!*handle) | |
288 | return -ENODEV; | |
289 | return 0; | |
290 | } | |
291 | ||
9c273b95 | 292 | static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle) |
84df749f DSL |
293 | { |
294 | int num; | |
295 | unsigned int seg, bus; | |
296 | ||
297 | /* | |
298 | * The string should be the same as root bridge's name | |
299 | * Please look at 'pci_scan_bus_parented' | |
300 | */ | |
301 | num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus); | |
302 | if (num != 2) | |
303 | return -ENODEV; | |
304 | *handle = acpi_get_pci_rootbridge_handle(seg, bus); | |
305 | if (!*handle) | |
306 | return -ENODEV; | |
307 | return 0; | |
308 | } | |
309 | ||
9c273b95 | 310 | static struct acpi_bus_type acpi_pci_bus = { |
84df749f | 311 | .bus = &pci_bus_type, |
9c273b95 MK |
312 | .find_device = acpi_pci_find_device, |
313 | .find_bridge = acpi_pci_find_root_bridge, | |
84df749f DSL |
314 | }; |
315 | ||
9c273b95 | 316 | static int __init acpi_pci_init(void) |
84df749f DSL |
317 | { |
318 | int ret; | |
319 | ||
9c273b95 | 320 | ret = register_acpi_bus_type(&acpi_pci_bus); |
84df749f DSL |
321 | if (ret) |
322 | return 0; | |
0f64474b | 323 | platform_pci_choose_state = acpi_pci_choose_state; |
b913100d | 324 | platform_pci_set_power_state = acpi_pci_set_power_state; |
84df749f DSL |
325 | return 0; |
326 | } | |
9c273b95 | 327 | arch_initcall(acpi_pci_init); |