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1 | /* | |
2 | * File: pci-acpi.c | |
3 | * Purpose: Provide PCI support in ACPI | |
4 | * | |
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. | |
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> | |
20 | #include "pci.h" | |
21 | ||
22 | static u32 ctrlset_buf[3] = {0, 0, 0}; | |
23 | static u32 global_ctrlsets = 0; | |
24 | static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66}; | |
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]; | |
36 | struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; | |
37 | union acpi_object *out_obj; | |
38 | u32 osc_dw0; | |
39 | acpi_status *ret_status = (acpi_status *)retval; | |
40 | ||
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 | *ret_status = status; | |
59 | return status; | |
60 | } | |
61 | out_obj = output.pointer; | |
62 | ||
63 | if (out_obj->type != ACPI_TYPE_BUFFER) { | |
64 | printk(KERN_DEBUG | |
65 | "Evaluate _OSC returns wrong type\n"); | |
66 | status = AE_TYPE; | |
67 | goto query_osc_out; | |
68 | } | |
69 | osc_dw0 = *((u32 *) out_obj->buffer.pointer); | |
70 | if (osc_dw0) { | |
71 | if (osc_dw0 & OSC_REQUEST_ERROR) | |
72 | printk(KERN_DEBUG "_OSC request fails\n"); | |
73 | if (osc_dw0 & OSC_INVALID_UUID_ERROR) | |
74 | printk(KERN_DEBUG "_OSC invalid UUID\n"); | |
75 | if (osc_dw0 & OSC_INVALID_REVISION_ERROR) | |
76 | printk(KERN_DEBUG "_OSC invalid revision\n"); | |
77 | if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) { | |
78 | /* Update Global Control Set */ | |
79 | global_ctrlsets = *((u32 *)(out_obj->buffer.pointer+8)); | |
80 | status = AE_OK; | |
81 | goto query_osc_out; | |
82 | } | |
83 | status = AE_ERROR; | |
84 | goto query_osc_out; | |
85 | } | |
86 | ||
87 | /* Update Global Control Set */ | |
88 | global_ctrlsets = *((u32 *)(out_obj->buffer.pointer + 8)); | |
89 | status = AE_OK; | |
90 | ||
91 | query_osc_out: | |
92 | kfree(output.pointer); | |
93 | *ret_status = status; | |
94 | return status; | |
95 | } | |
96 | ||
97 | ||
98 | static acpi_status | |
99 | acpi_run_osc ( | |
100 | acpi_handle handle, | |
101 | void *context) | |
102 | { | |
103 | acpi_status status; | |
104 | struct acpi_object_list input; | |
105 | union acpi_object in_params[4]; | |
106 | struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; | |
107 | union acpi_object *out_obj; | |
108 | u32 osc_dw0; | |
109 | ||
110 | /* Setting up input parameters */ | |
111 | input.count = 4; | |
112 | input.pointer = in_params; | |
113 | in_params[0].type = ACPI_TYPE_BUFFER; | |
114 | in_params[0].buffer.length = 16; | |
115 | in_params[0].buffer.pointer = OSC_UUID; | |
116 | in_params[1].type = ACPI_TYPE_INTEGER; | |
117 | in_params[1].integer.value = 1; | |
118 | in_params[2].type = ACPI_TYPE_INTEGER; | |
119 | in_params[2].integer.value = 3; | |
120 | in_params[3].type = ACPI_TYPE_BUFFER; | |
121 | in_params[3].buffer.length = 12; | |
122 | in_params[3].buffer.pointer = (u8 *)context; | |
123 | ||
124 | status = acpi_evaluate_object(handle, "_OSC", &input, &output); | |
125 | if (ACPI_FAILURE (status)) | |
126 | return status; | |
127 | ||
128 | out_obj = output.pointer; | |
129 | if (out_obj->type != ACPI_TYPE_BUFFER) { | |
130 | printk(KERN_DEBUG | |
131 | "Evaluate _OSC returns wrong type\n"); | |
132 | status = AE_TYPE; | |
133 | goto run_osc_out; | |
134 | } | |
135 | osc_dw0 = *((u32 *) out_obj->buffer.pointer); | |
136 | if (osc_dw0) { | |
137 | if (osc_dw0 & OSC_REQUEST_ERROR) | |
138 | printk(KERN_DEBUG "_OSC request fails\n"); | |
139 | if (osc_dw0 & OSC_INVALID_UUID_ERROR) | |
140 | printk(KERN_DEBUG "_OSC invalid UUID\n"); | |
141 | if (osc_dw0 & OSC_INVALID_REVISION_ERROR) | |
142 | printk(KERN_DEBUG "_OSC invalid revision\n"); | |
143 | if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) { | |
144 | printk(KERN_DEBUG "_OSC FW not grant req. control\n"); | |
145 | status = AE_SUPPORT; | |
146 | goto run_osc_out; | |
147 | } | |
148 | status = AE_ERROR; | |
149 | goto run_osc_out; | |
150 | } | |
151 | status = AE_OK; | |
152 | ||
153 | run_osc_out: | |
154 | kfree(output.pointer); | |
155 | return status; | |
156 | } | |
157 | ||
158 | /** | |
159 | * pci_osc_support_set - register OS support to Firmware | |
160 | * @flags: OS support bits | |
161 | * | |
162 | * Update OS support fields and doing a _OSC Query to obtain an update | |
163 | * from Firmware on supported control bits. | |
164 | **/ | |
165 | acpi_status pci_osc_support_set(u32 flags) | |
166 | { | |
167 | u32 temp; | |
168 | acpi_status retval; | |
169 | ||
170 | if (!(flags & OSC_SUPPORT_MASKS)) { | |
171 | return AE_TYPE; | |
172 | } | |
173 | ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS); | |
174 | ||
175 | /* do _OSC query for all possible controls */ | |
176 | temp = ctrlset_buf[OSC_CONTROL_TYPE]; | |
177 | ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; | |
178 | ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS; | |
179 | acpi_get_devices ( PCI_ROOT_HID_STRING, | |
180 | acpi_query_osc, | |
181 | ctrlset_buf, | |
182 | (void **) &retval ); | |
183 | ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE; | |
184 | ctrlset_buf[OSC_CONTROL_TYPE] = temp; | |
185 | if (ACPI_FAILURE(retval)) { | |
186 | /* no osc support at all */ | |
187 | ctrlset_buf[OSC_SUPPORT_TYPE] = 0; | |
188 | } | |
189 | return AE_OK; | |
190 | } | |
191 | EXPORT_SYMBOL(pci_osc_support_set); | |
192 | ||
193 | /** | |
194 | * pci_osc_control_set - commit requested control to Firmware | |
195 | * @handle: acpi_handle for the target ACPI object | |
196 | * @flags: driver's requested control bits | |
197 | * | |
198 | * Attempt to take control from Firmware on requested control bits. | |
199 | **/ | |
200 | acpi_status pci_osc_control_set(acpi_handle handle, u32 flags) | |
201 | { | |
202 | acpi_status status; | |
203 | u32 ctrlset; | |
204 | ||
205 | ctrlset = (flags & OSC_CONTROL_MASKS); | |
206 | if (!ctrlset) { | |
207 | return AE_TYPE; | |
208 | } | |
209 | if (ctrlset_buf[OSC_SUPPORT_TYPE] && | |
210 | ((global_ctrlsets & ctrlset) != ctrlset)) { | |
211 | return AE_SUPPORT; | |
212 | } | |
213 | ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset; | |
214 | status = acpi_run_osc(handle, ctrlset_buf); | |
215 | if (ACPI_FAILURE (status)) { | |
216 | ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset; | |
217 | } | |
218 | ||
219 | return status; | |
220 | } | |
221 | EXPORT_SYMBOL(pci_osc_control_set); | |
222 | ||
223 | /* | |
224 | * _SxD returns the D-state with the highest power | |
225 | * (lowest D-state number) supported in the S-state "x". | |
226 | * | |
227 | * If the devices does not have a _PRW | |
228 | * (Power Resources for Wake) supporting system wakeup from "x" | |
229 | * then the OS is free to choose a lower power (higher number | |
230 | * D-state) than the return value from _SxD. | |
231 | * | |
232 | * But if _PRW is enabled at S-state "x", the OS | |
233 | * must not choose a power lower than _SxD -- | |
234 | * unless the device has an _SxW method specifying | |
235 | * the lowest power (highest D-state number) the device | |
236 | * may enter while still able to wake the system. | |
237 | * | |
238 | * ie. depending on global OS policy: | |
239 | * | |
240 | * if (_PRW at S-state x) | |
241 | * choose from highest power _SxD to lowest power _SxW | |
242 | * else // no _PRW at S-state x | |
243 | * choose highest power _SxD or any lower power | |
244 | * | |
245 | * currently we simply return _SxD, if present. | |
246 | */ | |
247 | ||
248 | static int acpi_pci_choose_state(struct pci_dev *pdev, pm_message_t state) | |
249 | { | |
250 | /* TBD */ | |
251 | ||
252 | return -ENODEV; | |
253 | } | |
254 | ||
255 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) | |
256 | { | |
257 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); | |
258 | static int state_conv[] = { | |
259 | [0] = 0, | |
260 | [1] = 1, | |
261 | [2] = 2, | |
262 | [3] = 3, | |
263 | [4] = 3 | |
264 | }; | |
265 | int acpi_state = state_conv[(int __force) state]; | |
266 | ||
267 | if (!handle) | |
268 | return -ENODEV; | |
269 | return acpi_bus_set_power(handle, acpi_state); | |
270 | } | |
271 | ||
272 | ||
273 | /* ACPI bus type */ | |
274 | static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) | |
275 | { | |
276 | struct pci_dev * pci_dev; | |
277 | acpi_integer addr; | |
278 | ||
279 | pci_dev = to_pci_dev(dev); | |
280 | /* Please ref to ACPI spec for the syntax of _ADR */ | |
281 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); | |
282 | *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); | |
283 | if (!*handle) | |
284 | return -ENODEV; | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle) | |
289 | { | |
290 | int num; | |
291 | unsigned int seg, bus; | |
292 | ||
293 | /* | |
294 | * The string should be the same as root bridge's name | |
295 | * Please look at 'pci_scan_bus_parented' | |
296 | */ | |
297 | num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus); | |
298 | if (num != 2) | |
299 | return -ENODEV; | |
300 | *handle = acpi_get_pci_rootbridge_handle(seg, bus); | |
301 | if (!*handle) | |
302 | return -ENODEV; | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static struct acpi_bus_type acpi_pci_bus = { | |
307 | .bus = &pci_bus_type, | |
308 | .find_device = acpi_pci_find_device, | |
309 | .find_bridge = acpi_pci_find_root_bridge, | |
310 | }; | |
311 | ||
312 | static int __init acpi_pci_init(void) | |
313 | { | |
314 | int ret; | |
315 | ||
316 | if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) { | |
317 | printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n"); | |
318 | pci_no_msi(); | |
319 | } | |
320 | ret = register_acpi_bus_type(&acpi_pci_bus); | |
321 | if (ret) | |
322 | return 0; | |
323 | platform_pci_choose_state = acpi_pci_choose_state; | |
324 | platform_pci_set_power_state = acpi_pci_set_power_state; | |
325 | return 0; | |
326 | } | |
327 | arch_initcall(acpi_pci_init); |