Commit | Line | Data |
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1da177e4 | 1 | /* |
783c49fc | 2 | * Common ACPI functions for hot plug platforms |
1da177e4 | 3 | * |
783c49fc | 4 | * Copyright (C) 2006 Intel Corporation |
1da177e4 LT |
5 | * |
6 | * All rights reserved. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or (at | |
11 | * your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
16 | * NON INFRINGEMENT. See the GNU General Public License for more | |
17 | * details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | * | |
8cf4c195 | 23 | * Send feedback to <kristen.c.accardi@intel.com> |
1da177e4 LT |
24 | * |
25 | */ | |
26 | ||
1da177e4 | 27 | #include <linux/module.h> |
aad20cab | 28 | #include <linux/moduleparam.h> |
1da177e4 LT |
29 | #include <linux/kernel.h> |
30 | #include <linux/types.h> | |
31 | #include <linux/pci.h> | |
7a54f25c | 32 | #include <linux/pci_hotplug.h> |
783c49fc | 33 | #include <acpi/acpi.h> |
1da177e4 LT |
34 | #include <acpi/acpi_bus.h> |
35 | #include <acpi/actypes.h> | |
1da177e4 | 36 | |
aad20cab KK |
37 | #define MY_NAME "acpi_pcihp" |
38 | ||
66bef8c0 | 39 | #define dbg(fmt, arg...) do { if (debug_acpi) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0) |
aad20cab KK |
40 | #define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg) |
41 | #define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg) | |
42 | #define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg) | |
43 | ||
1da177e4 LT |
44 | #define METHOD_NAME__SUN "_SUN" |
45 | #define METHOD_NAME__HPP "_HPP" | |
46 | #define METHOD_NAME_OSHP "OSHP" | |
47 | ||
aad20cab KK |
48 | static int debug_acpi; |
49 | ||
e22b7350 KK |
50 | static acpi_status |
51 | decode_type0_hpx_record(union acpi_object *record, struct hotplug_params *hpx) | |
52 | { | |
53 | int i; | |
54 | union acpi_object *fields = record->package.elements; | |
55 | u32 revision = fields[1].integer.value; | |
56 | ||
57 | switch (revision) { | |
58 | case 1: | |
59 | if (record->package.count != 6) | |
60 | return AE_ERROR; | |
61 | for (i = 2; i < 6; i++) | |
62 | if (fields[i].type != ACPI_TYPE_INTEGER) | |
63 | return AE_ERROR; | |
64 | hpx->t0 = &hpx->type0_data; | |
65 | hpx->t0->revision = revision; | |
66 | hpx->t0->cache_line_size = fields[2].integer.value; | |
67 | hpx->t0->latency_timer = fields[3].integer.value; | |
68 | hpx->t0->enable_serr = fields[4].integer.value; | |
69 | hpx->t0->enable_perr = fields[5].integer.value; | |
70 | break; | |
71 | default: | |
72 | printk(KERN_WARNING | |
73 | "%s: Type 0 Revision %d record not supported\n", | |
66bef8c0 | 74 | __func__, revision); |
e22b7350 KK |
75 | return AE_ERROR; |
76 | } | |
77 | return AE_OK; | |
78 | } | |
79 | ||
80 | static acpi_status | |
81 | decode_type1_hpx_record(union acpi_object *record, struct hotplug_params *hpx) | |
82 | { | |
83 | int i; | |
84 | union acpi_object *fields = record->package.elements; | |
85 | u32 revision = fields[1].integer.value; | |
86 | ||
87 | switch (revision) { | |
88 | case 1: | |
89 | if (record->package.count != 5) | |
90 | return AE_ERROR; | |
91 | for (i = 2; i < 5; i++) | |
92 | if (fields[i].type != ACPI_TYPE_INTEGER) | |
93 | return AE_ERROR; | |
94 | hpx->t1 = &hpx->type1_data; | |
95 | hpx->t1->revision = revision; | |
96 | hpx->t1->max_mem_read = fields[2].integer.value; | |
97 | hpx->t1->avg_max_split = fields[3].integer.value; | |
98 | hpx->t1->tot_max_split = fields[4].integer.value; | |
99 | break; | |
100 | default: | |
101 | printk(KERN_WARNING | |
102 | "%s: Type 1 Revision %d record not supported\n", | |
66bef8c0 | 103 | __func__, revision); |
e22b7350 KK |
104 | return AE_ERROR; |
105 | } | |
106 | return AE_OK; | |
107 | } | |
108 | ||
109 | static acpi_status | |
110 | decode_type2_hpx_record(union acpi_object *record, struct hotplug_params *hpx) | |
111 | { | |
112 | int i; | |
113 | union acpi_object *fields = record->package.elements; | |
114 | u32 revision = fields[1].integer.value; | |
115 | ||
116 | switch (revision) { | |
117 | case 1: | |
118 | if (record->package.count != 18) | |
119 | return AE_ERROR; | |
120 | for (i = 2; i < 18; i++) | |
121 | if (fields[i].type != ACPI_TYPE_INTEGER) | |
122 | return AE_ERROR; | |
123 | hpx->t2 = &hpx->type2_data; | |
124 | hpx->t2->revision = revision; | |
125 | hpx->t2->unc_err_mask_and = fields[2].integer.value; | |
126 | hpx->t2->unc_err_mask_or = fields[3].integer.value; | |
127 | hpx->t2->unc_err_sever_and = fields[4].integer.value; | |
128 | hpx->t2->unc_err_sever_or = fields[5].integer.value; | |
129 | hpx->t2->cor_err_mask_and = fields[6].integer.value; | |
130 | hpx->t2->cor_err_mask_or = fields[7].integer.value; | |
131 | hpx->t2->adv_err_cap_and = fields[8].integer.value; | |
132 | hpx->t2->adv_err_cap_or = fields[9].integer.value; | |
133 | hpx->t2->pci_exp_devctl_and = fields[10].integer.value; | |
134 | hpx->t2->pci_exp_devctl_or = fields[11].integer.value; | |
135 | hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value; | |
136 | hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value; | |
137 | hpx->t2->sec_unc_err_sever_and = fields[14].integer.value; | |
138 | hpx->t2->sec_unc_err_sever_or = fields[15].integer.value; | |
139 | hpx->t2->sec_unc_err_mask_and = fields[16].integer.value; | |
140 | hpx->t2->sec_unc_err_mask_or = fields[17].integer.value; | |
141 | break; | |
142 | default: | |
143 | printk(KERN_WARNING | |
144 | "%s: Type 2 Revision %d record not supported\n", | |
66bef8c0 | 145 | __func__, revision); |
e22b7350 KK |
146 | return AE_ERROR; |
147 | } | |
148 | return AE_OK; | |
149 | } | |
150 | ||
151 | static acpi_status | |
152 | acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx) | |
153 | { | |
154 | acpi_status status; | |
155 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
156 | union acpi_object *package, *record, *fields; | |
157 | u32 type; | |
158 | int i; | |
159 | ||
160 | /* Clear the return buffer with zeros */ | |
161 | memset(hpx, 0, sizeof(struct hotplug_params)); | |
162 | ||
163 | status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer); | |
164 | if (ACPI_FAILURE(status)) | |
165 | return status; | |
166 | ||
167 | package = (union acpi_object *)buffer.pointer; | |
168 | if (package->type != ACPI_TYPE_PACKAGE) { | |
169 | status = AE_ERROR; | |
170 | goto exit; | |
171 | } | |
172 | ||
173 | for (i = 0; i < package->package.count; i++) { | |
174 | record = &package->package.elements[i]; | |
175 | if (record->type != ACPI_TYPE_PACKAGE) { | |
176 | status = AE_ERROR; | |
177 | goto exit; | |
178 | } | |
179 | ||
180 | fields = record->package.elements; | |
181 | if (fields[0].type != ACPI_TYPE_INTEGER || | |
182 | fields[1].type != ACPI_TYPE_INTEGER) { | |
183 | status = AE_ERROR; | |
184 | goto exit; | |
185 | } | |
186 | ||
187 | type = fields[0].integer.value; | |
188 | switch (type) { | |
189 | case 0: | |
190 | status = decode_type0_hpx_record(record, hpx); | |
191 | if (ACPI_FAILURE(status)) | |
192 | goto exit; | |
193 | break; | |
194 | case 1: | |
195 | status = decode_type1_hpx_record(record, hpx); | |
196 | if (ACPI_FAILURE(status)) | |
197 | goto exit; | |
198 | break; | |
199 | case 2: | |
200 | status = decode_type2_hpx_record(record, hpx); | |
201 | if (ACPI_FAILURE(status)) | |
202 | goto exit; | |
203 | break; | |
204 | default: | |
205 | printk(KERN_ERR "%s: Type %d record not supported\n", | |
66bef8c0 | 206 | __func__, type); |
e22b7350 KK |
207 | status = AE_ERROR; |
208 | goto exit; | |
209 | } | |
210 | } | |
211 | exit: | |
212 | kfree(buffer.pointer); | |
213 | return status; | |
214 | } | |
1da177e4 | 215 | |
a8a2be94 | 216 | static acpi_status |
217 | acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp) | |
1da177e4 LT |
218 | { |
219 | acpi_status status; | |
220 | u8 nui[4]; | |
221 | struct acpi_buffer ret_buf = { 0, NULL}; | |
b2e6e3ba | 222 | struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 | 223 | union acpi_object *ext_obj, *package; |
1da177e4 LT |
224 | int i, len = 0; |
225 | ||
b2e6e3ba MT |
226 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); |
227 | ||
e22b7350 KK |
228 | /* Clear the return buffer with zeros */ |
229 | memset(hpp, 0, sizeof(struct hotplug_params)); | |
230 | ||
1da177e4 | 231 | /* get _hpp */ |
a8a2be94 | 232 | status = acpi_evaluate_object(handle, METHOD_NAME__HPP, NULL, &ret_buf); |
1da177e4 LT |
233 | switch (status) { |
234 | case AE_BUFFER_OVERFLOW: | |
235 | ret_buf.pointer = kmalloc (ret_buf.length, GFP_KERNEL); | |
236 | if (!ret_buf.pointer) { | |
783c49fc | 237 | printk(KERN_ERR "%s:%s alloc for _HPP fail\n", |
66bef8c0 | 238 | __func__, (char *)string.pointer); |
81b26bca | 239 | kfree(string.pointer); |
a8a2be94 | 240 | return AE_NO_MEMORY; |
1da177e4 | 241 | } |
a8a2be94 | 242 | status = acpi_evaluate_object(handle, METHOD_NAME__HPP, |
243 | NULL, &ret_buf); | |
1da177e4 LT |
244 | if (ACPI_SUCCESS(status)) |
245 | break; | |
246 | default: | |
247 | if (ACPI_FAILURE(status)) { | |
66bef8c0 | 248 | pr_debug("%s:%s _HPP fail=0x%x\n", __func__, |
b2e6e3ba | 249 | (char *)string.pointer, status); |
81b26bca | 250 | kfree(string.pointer); |
a8a2be94 | 251 | return status; |
1da177e4 LT |
252 | } |
253 | } | |
254 | ||
255 | ext_obj = (union acpi_object *) ret_buf.pointer; | |
256 | if (ext_obj->type != ACPI_TYPE_PACKAGE) { | |
66bef8c0 | 257 | printk(KERN_ERR "%s:%s _HPP obj not a package\n", __func__, |
b2e6e3ba | 258 | (char *)string.pointer); |
a8a2be94 | 259 | status = AE_ERROR; |
1da177e4 LT |
260 | goto free_and_return; |
261 | } | |
262 | ||
263 | len = ext_obj->package.count; | |
264 | package = (union acpi_object *) ret_buf.pointer; | |
265 | for ( i = 0; (i < len) || (i < 4); i++) { | |
266 | ext_obj = (union acpi_object *) &package->package.elements[i]; | |
267 | switch (ext_obj->type) { | |
268 | case ACPI_TYPE_INTEGER: | |
269 | nui[i] = (u8)ext_obj->integer.value; | |
270 | break; | |
271 | default: | |
783c49fc | 272 | printk(KERN_ERR "%s:%s _HPP obj type incorrect\n", |
66bef8c0 | 273 | __func__, (char *)string.pointer); |
a8a2be94 | 274 | status = AE_ERROR; |
1da177e4 LT |
275 | goto free_and_return; |
276 | } | |
277 | } | |
278 | ||
e22b7350 KK |
279 | hpp->t0 = &hpp->type0_data; |
280 | hpp->t0->cache_line_size = nui[0]; | |
281 | hpp->t0->latency_timer = nui[1]; | |
282 | hpp->t0->enable_serr = nui[2]; | |
283 | hpp->t0->enable_perr = nui[3]; | |
1da177e4 | 284 | |
e22b7350 KK |
285 | pr_debug(" _HPP: cache_line_size=0x%x\n", hpp->t0->cache_line_size); |
286 | pr_debug(" _HPP: latency timer =0x%x\n", hpp->t0->latency_timer); | |
287 | pr_debug(" _HPP: enable SERR =0x%x\n", hpp->t0->enable_serr); | |
288 | pr_debug(" _HPP: enable PERR =0x%x\n", hpp->t0->enable_perr); | |
1da177e4 LT |
289 | |
290 | free_and_return: | |
81b26bca KA |
291 | kfree(string.pointer); |
292 | kfree(ret_buf.pointer); | |
a8a2be94 | 293 | return status; |
1da177e4 LT |
294 | } |
295 | ||
783c49fc KA |
296 | |
297 | ||
298 | /* acpi_run_oshp - get control of hotplug from the firmware | |
299 | * | |
300 | * @handle - the handle of the hotplug controller. | |
301 | */ | |
302 | acpi_status acpi_run_oshp(acpi_handle handle) | |
1da177e4 LT |
303 | { |
304 | acpi_status status; | |
b2e6e3ba MT |
305 | struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL }; |
306 | ||
307 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); | |
1da177e4 LT |
308 | |
309 | /* run OSHP */ | |
a8a2be94 | 310 | status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL); |
783c49fc | 311 | if (ACPI_FAILURE(status)) |
aad20cab KK |
312 | if (status != AE_NOT_FOUND) |
313 | printk(KERN_ERR "%s:%s OSHP fails=0x%x\n", | |
66bef8c0 | 314 | __func__, (char *)string.pointer, status); |
aad20cab KK |
315 | else |
316 | dbg("%s:%s OSHP not found\n", | |
66bef8c0 | 317 | __func__, (char *)string.pointer); |
783c49fc | 318 | else |
66bef8c0 | 319 | pr_debug("%s:%s OSHP passes\n", __func__, |
b2e6e3ba MT |
320 | (char *)string.pointer); |
321 | ||
81b26bca | 322 | kfree(string.pointer); |
783c49fc KA |
323 | return status; |
324 | } | |
325 | EXPORT_SYMBOL_GPL(acpi_run_oshp); | |
326 | ||
327 | ||
328 | ||
329 | /* acpi_get_hp_params_from_firmware | |
330 | * | |
7430e34c | 331 | * @bus - the pci_bus of the bus on which the device is newly added |
783c49fc KA |
332 | * @hpp - allocated by the caller |
333 | */ | |
7430e34c | 334 | acpi_status acpi_get_hp_params_from_firmware(struct pci_bus *bus, |
783c49fc KA |
335 | struct hotplug_params *hpp) |
336 | { | |
337 | acpi_status status = AE_NOT_FOUND; | |
7430e34c KK |
338 | acpi_handle handle, phandle; |
339 | struct pci_bus *pbus = bus; | |
340 | struct pci_dev *pdev; | |
341 | ||
342 | do { | |
343 | pdev = pbus->self; | |
344 | if (!pdev) { | |
345 | handle = acpi_get_pci_rootbridge_handle( | |
346 | pci_domain_nr(pbus), pbus->number); | |
347 | break; | |
348 | } | |
349 | handle = DEVICE_ACPI_HANDLE(&(pdev->dev)); | |
350 | pbus = pbus->parent; | |
351 | } while (!handle); | |
783c49fc KA |
352 | |
353 | /* | |
354 | * _HPP settings apply to all child buses, until another _HPP is | |
355 | * encountered. If we don't find an _HPP for the input pci dev, | |
356 | * look for it in the parent device scope since that would apply to | |
357 | * this pci dev. If we don't find any _HPP, use hardcoded defaults | |
358 | */ | |
7430e34c | 359 | while (handle) { |
e22b7350 KK |
360 | status = acpi_run_hpx(handle, hpp); |
361 | if (ACPI_SUCCESS(status)) | |
362 | break; | |
783c49fc | 363 | status = acpi_run_hpp(handle, hpp); |
7430e34c KK |
364 | if (ACPI_SUCCESS(status)) |
365 | break; | |
366 | if (acpi_root_bridge(handle)) | |
367 | break; | |
368 | status = acpi_get_parent(handle, &phandle); | |
369 | if (ACPI_FAILURE(status)) | |
783c49fc | 370 | break; |
7430e34c | 371 | handle = phandle; |
1da177e4 | 372 | } |
a8a2be94 | 373 | return status; |
1da177e4 | 374 | } |
783c49fc KA |
375 | EXPORT_SYMBOL_GPL(acpi_get_hp_params_from_firmware); |
376 | ||
1da177e4 | 377 | |
783c49fc KA |
378 | /* acpi_root_bridge - check to see if this acpi object is a root bridge |
379 | * | |
380 | * @handle - the acpi object in question. | |
381 | */ | |
382 | int acpi_root_bridge(acpi_handle handle) | |
a3a45ec8 | 383 | { |
384 | acpi_status status; | |
385 | struct acpi_device_info *info; | |
386 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
387 | int i; | |
388 | ||
389 | status = acpi_get_object_info(handle, &buffer); | |
390 | if (ACPI_SUCCESS(status)) { | |
391 | info = buffer.pointer; | |
392 | if ((info->valid & ACPI_VALID_HID) && | |
393 | !strcmp(PCI_ROOT_HID_STRING, | |
394 | info->hardware_id.value)) { | |
81b26bca | 395 | kfree(buffer.pointer); |
a3a45ec8 | 396 | return 1; |
397 | } | |
398 | if (info->valid & ACPI_VALID_CID) { | |
399 | for (i=0; i < info->compatibility_id.count; i++) { | |
400 | if (!strcmp(PCI_ROOT_HID_STRING, | |
401 | info->compatibility_id.id[i].value)) { | |
81b26bca | 402 | kfree(buffer.pointer); |
a3a45ec8 | 403 | return 1; |
404 | } | |
405 | } | |
406 | } | |
81b26bca | 407 | kfree(buffer.pointer); |
a3a45ec8 | 408 | } |
409 | return 0; | |
410 | } | |
783c49fc | 411 | EXPORT_SYMBOL_GPL(acpi_root_bridge); |
aad20cab KK |
412 | |
413 | module_param(debug_acpi, bool, 0644); | |
414 | MODULE_PARM_DESC(debug_acpi, "Debugging mode for ACPI enabled or not"); |