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1da177e4 LT |
1 | /* |
2 | * acpi-cpufreq.c - ACPI Processor P-States Driver ($Revision: 1.3 $) | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
6 | * Copyright (C) 2002 - 2004 Dominik Brodowski <linux@brodo.de> | |
7 | * | |
8 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or (at | |
13 | * your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License along | |
21 | * with this program; if not, write to the Free Software Foundation, Inc., | |
22 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
23 | * | |
24 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
25 | */ | |
26 | ||
1da177e4 LT |
27 | #include <linux/kernel.h> |
28 | #include <linux/module.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/cpufreq.h> | |
31 | #include <linux/proc_fs.h> | |
32 | #include <linux/seq_file.h> | |
d395bf12 | 33 | #include <linux/compiler.h> |
4e57b681 | 34 | #include <linux/sched.h> /* current */ |
1da177e4 LT |
35 | #include <asm/io.h> |
36 | #include <asm/delay.h> | |
37 | #include <asm/uaccess.h> | |
38 | ||
39 | #include <linux/acpi.h> | |
40 | #include <acpi/processor.h> | |
41 | ||
1da177e4 LT |
42 | #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "acpi-cpufreq", msg) |
43 | ||
44 | MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski"); | |
45 | MODULE_DESCRIPTION("ACPI Processor P-States Driver"); | |
46 | MODULE_LICENSE("GPL"); | |
47 | ||
48 | ||
49 | struct cpufreq_acpi_io { | |
09b4d1ee | 50 | struct acpi_processor_performance *acpi_data; |
1da177e4 LT |
51 | struct cpufreq_frequency_table *freq_table; |
52 | unsigned int resume; | |
53 | }; | |
54 | ||
55 | static struct cpufreq_acpi_io *acpi_io_data[NR_CPUS]; | |
09b4d1ee | 56 | static struct acpi_processor_performance *acpi_perf_data[NR_CPUS]; |
1da177e4 LT |
57 | |
58 | static struct cpufreq_driver acpi_cpufreq_driver; | |
59 | ||
d395bf12 VP |
60 | static unsigned int acpi_pstate_strict; |
61 | ||
1da177e4 LT |
62 | static int |
63 | acpi_processor_write_port( | |
64 | u16 port, | |
65 | u8 bit_width, | |
66 | u32 value) | |
67 | { | |
68 | if (bit_width <= 8) { | |
69 | outb(value, port); | |
70 | } else if (bit_width <= 16) { | |
71 | outw(value, port); | |
72 | } else if (bit_width <= 32) { | |
73 | outl(value, port); | |
74 | } else { | |
75 | return -ENODEV; | |
76 | } | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static int | |
81 | acpi_processor_read_port( | |
82 | u16 port, | |
83 | u8 bit_width, | |
84 | u32 *ret) | |
85 | { | |
86 | *ret = 0; | |
87 | if (bit_width <= 8) { | |
88 | *ret = inb(port); | |
89 | } else if (bit_width <= 16) { | |
90 | *ret = inw(port); | |
91 | } else if (bit_width <= 32) { | |
92 | *ret = inl(port); | |
93 | } else { | |
94 | return -ENODEV; | |
95 | } | |
96 | return 0; | |
97 | } | |
98 | ||
99 | static int | |
100 | acpi_processor_set_performance ( | |
101 | struct cpufreq_acpi_io *data, | |
102 | unsigned int cpu, | |
103 | int state) | |
104 | { | |
105 | u16 port = 0; | |
106 | u8 bit_width = 0; | |
1da177e4 | 107 | int i = 0; |
1da177e4 LT |
108 | int ret = 0; |
109 | u32 value = 0; | |
1da177e4 | 110 | int retval; |
09b4d1ee | 111 | struct acpi_processor_performance *perf; |
1da177e4 LT |
112 | |
113 | dprintk("acpi_processor_set_performance\n"); | |
114 | ||
09b4d1ee VP |
115 | retval = 0; |
116 | perf = data->acpi_data; | |
117 | if (state == perf->state) { | |
1da177e4 LT |
118 | if (unlikely(data->resume)) { |
119 | dprintk("Called after resume, resetting to P%d\n", state); | |
120 | data->resume = 0; | |
121 | } else { | |
122 | dprintk("Already at target state (P%d)\n", state); | |
09b4d1ee | 123 | return (retval); |
1da177e4 LT |
124 | } |
125 | } | |
126 | ||
09b4d1ee | 127 | dprintk("Transitioning from P%d to P%d\n", perf->state, state); |
1da177e4 LT |
128 | |
129 | /* | |
130 | * First we write the target state's 'control' value to the | |
131 | * control_register. | |
132 | */ | |
133 | ||
09b4d1ee VP |
134 | port = perf->control_register.address; |
135 | bit_width = perf->control_register.bit_width; | |
136 | value = (u32) perf->states[state].control; | |
1da177e4 LT |
137 | |
138 | dprintk("Writing 0x%08x to port 0x%04x\n", value, port); | |
139 | ||
140 | ret = acpi_processor_write_port(port, bit_width, value); | |
141 | if (ret) { | |
142 | dprintk("Invalid port width 0x%04x\n", bit_width); | |
09b4d1ee | 143 | return (ret); |
1da177e4 LT |
144 | } |
145 | ||
146 | /* | |
d395bf12 VP |
147 | * Assume the write went through when acpi_pstate_strict is not used. |
148 | * As read status_register is an expensive operation and there | |
149 | * are no specific error cases where an IO port write will fail. | |
1da177e4 | 150 | */ |
d395bf12 VP |
151 | if (acpi_pstate_strict) { |
152 | /* Then we read the 'status_register' and compare the value | |
153 | * with the target state's 'status' to make sure the | |
154 | * transition was successful. | |
155 | * Note that we'll poll for up to 1ms (100 cycles of 10us) | |
156 | * before giving up. | |
157 | */ | |
158 | ||
09b4d1ee VP |
159 | port = perf->status_register.address; |
160 | bit_width = perf->status_register.bit_width; | |
d395bf12 VP |
161 | |
162 | dprintk("Looking for 0x%08x from port 0x%04x\n", | |
09b4d1ee | 163 | (u32) perf->states[state].status, port); |
d395bf12 | 164 | |
09b4d1ee | 165 | for (i = 0; i < 100; i++) { |
d395bf12 VP |
166 | ret = acpi_processor_read_port(port, bit_width, &value); |
167 | if (ret) { | |
168 | dprintk("Invalid port width 0x%04x\n", bit_width); | |
09b4d1ee | 169 | return (ret); |
d395bf12 | 170 | } |
09b4d1ee | 171 | if (value == (u32) perf->states[state].status) |
d395bf12 VP |
172 | break; |
173 | udelay(10); | |
1da177e4 | 174 | } |
d395bf12 | 175 | } else { |
09b4d1ee | 176 | value = (u32) perf->states[state].status; |
1da177e4 LT |
177 | } |
178 | ||
09b4d1ee | 179 | if (unlikely(value != (u32) perf->states[state].status)) { |
1da177e4 LT |
180 | printk(KERN_WARNING "acpi-cpufreq: Transition failed\n"); |
181 | retval = -ENODEV; | |
09b4d1ee | 182 | return (retval); |
1da177e4 LT |
183 | } |
184 | ||
185 | dprintk("Transition successful after %d microseconds\n", i * 10); | |
186 | ||
09b4d1ee | 187 | perf->state = state; |
1da177e4 LT |
188 | return (retval); |
189 | } | |
190 | ||
191 | ||
192 | static int | |
193 | acpi_cpufreq_target ( | |
194 | struct cpufreq_policy *policy, | |
195 | unsigned int target_freq, | |
196 | unsigned int relation) | |
197 | { | |
198 | struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu]; | |
09b4d1ee VP |
199 | struct acpi_processor_performance *perf; |
200 | struct cpufreq_freqs freqs; | |
201 | cpumask_t online_policy_cpus; | |
202 | cpumask_t saved_mask; | |
203 | cpumask_t set_mask; | |
204 | cpumask_t covered_cpus; | |
205 | unsigned int cur_state = 0; | |
1da177e4 LT |
206 | unsigned int next_state = 0; |
207 | unsigned int result = 0; | |
09b4d1ee VP |
208 | unsigned int j; |
209 | unsigned int tmp; | |
1da177e4 LT |
210 | |
211 | dprintk("acpi_cpufreq_setpolicy\n"); | |
212 | ||
213 | result = cpufreq_frequency_table_target(policy, | |
214 | data->freq_table, | |
215 | target_freq, | |
216 | relation, | |
217 | &next_state); | |
09b4d1ee | 218 | if (unlikely(result)) |
1da177e4 LT |
219 | return (result); |
220 | ||
09b4d1ee VP |
221 | perf = data->acpi_data; |
222 | cur_state = perf->state; | |
223 | freqs.old = data->freq_table[cur_state].frequency; | |
224 | freqs.new = data->freq_table[next_state].frequency; | |
225 | ||
7e1f19e5 | 226 | #ifdef CONFIG_HOTPLUG_CPU |
09b4d1ee VP |
227 | /* cpufreq holds the hotplug lock, so we are safe from here on */ |
228 | cpus_and(online_policy_cpus, cpu_online_map, policy->cpus); | |
7e1f19e5 AM |
229 | #else |
230 | online_policy_cpus = policy->cpus; | |
231 | #endif | |
1da177e4 | 232 | |
09b4d1ee VP |
233 | for_each_cpu_mask(j, online_policy_cpus) { |
234 | freqs.cpu = j; | |
235 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
236 | } | |
237 | ||
238 | /* | |
239 | * We need to call driver->target() on all or any CPU in | |
240 | * policy->cpus, depending on policy->shared_type. | |
241 | */ | |
242 | saved_mask = current->cpus_allowed; | |
243 | cpus_clear(covered_cpus); | |
244 | for_each_cpu_mask(j, online_policy_cpus) { | |
245 | /* | |
246 | * Support for SMP systems. | |
247 | * Make sure we are running on CPU that wants to change freq | |
248 | */ | |
249 | cpus_clear(set_mask); | |
250 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) | |
251 | cpus_or(set_mask, set_mask, online_policy_cpus); | |
252 | else | |
253 | cpu_set(j, set_mask); | |
254 | ||
255 | set_cpus_allowed(current, set_mask); | |
256 | if (unlikely(!cpu_isset(smp_processor_id(), set_mask))) { | |
257 | dprintk("couldn't limit to CPUs in this domain\n"); | |
258 | result = -EAGAIN; | |
259 | break; | |
260 | } | |
261 | ||
262 | result = acpi_processor_set_performance (data, j, next_state); | |
263 | if (result) { | |
264 | result = -EAGAIN; | |
265 | break; | |
266 | } | |
267 | ||
268 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) | |
269 | break; | |
270 | ||
271 | cpu_set(j, covered_cpus); | |
272 | } | |
273 | ||
274 | for_each_cpu_mask(j, online_policy_cpus) { | |
275 | freqs.cpu = j; | |
276 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
277 | } | |
1da177e4 | 278 | |
09b4d1ee VP |
279 | if (unlikely(result)) { |
280 | /* | |
281 | * We have failed halfway through the frequency change. | |
282 | * We have sent callbacks to online_policy_cpus and | |
283 | * acpi_processor_set_performance() has been called on | |
284 | * coverd_cpus. Best effort undo.. | |
285 | */ | |
286 | ||
287 | if (!cpus_empty(covered_cpus)) { | |
288 | for_each_cpu_mask(j, covered_cpus) { | |
289 | policy->cpu = j; | |
290 | acpi_processor_set_performance (data, | |
291 | j, | |
292 | cur_state); | |
293 | } | |
294 | } | |
295 | ||
296 | tmp = freqs.new; | |
297 | freqs.new = freqs.old; | |
298 | freqs.old = tmp; | |
299 | for_each_cpu_mask(j, online_policy_cpus) { | |
300 | freqs.cpu = j; | |
301 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
302 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
303 | } | |
304 | } | |
305 | ||
306 | set_cpus_allowed(current, saved_mask); | |
1da177e4 LT |
307 | return (result); |
308 | } | |
309 | ||
310 | ||
311 | static int | |
312 | acpi_cpufreq_verify ( | |
313 | struct cpufreq_policy *policy) | |
314 | { | |
315 | unsigned int result = 0; | |
316 | struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu]; | |
317 | ||
318 | dprintk("acpi_cpufreq_verify\n"); | |
319 | ||
320 | result = cpufreq_frequency_table_verify(policy, | |
321 | data->freq_table); | |
322 | ||
323 | return (result); | |
324 | } | |
325 | ||
326 | ||
327 | static unsigned long | |
328 | acpi_cpufreq_guess_freq ( | |
329 | struct cpufreq_acpi_io *data, | |
330 | unsigned int cpu) | |
331 | { | |
09b4d1ee VP |
332 | struct acpi_processor_performance *perf = data->acpi_data; |
333 | ||
1da177e4 LT |
334 | if (cpu_khz) { |
335 | /* search the closest match to cpu_khz */ | |
336 | unsigned int i; | |
337 | unsigned long freq; | |
09b4d1ee | 338 | unsigned long freqn = perf->states[0].core_frequency * 1000; |
1da177e4 | 339 | |
09b4d1ee | 340 | for (i = 0; i < (perf->state_count - 1); i++) { |
1da177e4 | 341 | freq = freqn; |
09b4d1ee | 342 | freqn = perf->states[i+1].core_frequency * 1000; |
1da177e4 | 343 | if ((2 * cpu_khz) > (freqn + freq)) { |
09b4d1ee | 344 | perf->state = i; |
1da177e4 LT |
345 | return (freq); |
346 | } | |
347 | } | |
09b4d1ee | 348 | perf->state = perf->state_count - 1; |
1da177e4 | 349 | return (freqn); |
09b4d1ee | 350 | } else { |
1da177e4 | 351 | /* assume CPU is at P0... */ |
09b4d1ee VP |
352 | perf->state = 0; |
353 | return perf->states[0].core_frequency * 1000; | |
354 | } | |
1da177e4 LT |
355 | } |
356 | ||
357 | ||
09b4d1ee VP |
358 | /* |
359 | * acpi_cpufreq_early_init - initialize ACPI P-States library | |
360 | * | |
361 | * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c) | |
362 | * in order to determine correct frequency and voltage pairings. We can | |
363 | * do _PDC and _PSD and find out the processor dependency for the | |
364 | * actual init that will happen later... | |
365 | */ | |
366 | static int acpi_cpufreq_early_init_acpi(void) | |
367 | { | |
368 | struct acpi_processor_performance *data; | |
369 | unsigned int i, j; | |
370 | ||
371 | dprintk("acpi_cpufreq_early_init\n"); | |
372 | ||
fb1bb34d | 373 | for_each_possible_cpu(i) { |
09b4d1ee VP |
374 | data = kzalloc(sizeof(struct acpi_processor_performance), |
375 | GFP_KERNEL); | |
376 | if (!data) { | |
fb1bb34d | 377 | for_each_possible_cpu(j) { |
09b4d1ee VP |
378 | kfree(acpi_perf_data[j]); |
379 | acpi_perf_data[j] = NULL; | |
380 | } | |
381 | return (-ENOMEM); | |
382 | } | |
383 | acpi_perf_data[i] = data; | |
384 | } | |
385 | ||
386 | /* Do initialization in ACPI core */ | |
12e704db | 387 | return acpi_processor_preregister_performance(acpi_perf_data); |
09b4d1ee VP |
388 | } |
389 | ||
1da177e4 LT |
390 | static int |
391 | acpi_cpufreq_cpu_init ( | |
392 | struct cpufreq_policy *policy) | |
393 | { | |
394 | unsigned int i; | |
395 | unsigned int cpu = policy->cpu; | |
396 | struct cpufreq_acpi_io *data; | |
397 | unsigned int result = 0; | |
152bf8c5 | 398 | struct cpuinfo_x86 *c = &cpu_data[policy->cpu]; |
09b4d1ee | 399 | struct acpi_processor_performance *perf; |
1da177e4 | 400 | |
1da177e4 | 401 | dprintk("acpi_cpufreq_cpu_init\n"); |
1da177e4 | 402 | |
09b4d1ee VP |
403 | if (!acpi_perf_data[cpu]) |
404 | return (-ENODEV); | |
405 | ||
bfdc708d | 406 | data = kzalloc(sizeof(struct cpufreq_acpi_io), GFP_KERNEL); |
1da177e4 LT |
407 | if (!data) |
408 | return (-ENOMEM); | |
1da177e4 | 409 | |
09b4d1ee | 410 | data->acpi_data = acpi_perf_data[cpu]; |
1da177e4 LT |
411 | acpi_io_data[cpu] = data; |
412 | ||
09b4d1ee | 413 | result = acpi_processor_register_performance(data->acpi_data, cpu); |
1da177e4 LT |
414 | |
415 | if (result) | |
416 | goto err_free; | |
417 | ||
09b4d1ee | 418 | perf = data->acpi_data; |
09b4d1ee | 419 | policy->shared_type = perf->shared_type; |
46f18e3a VP |
420 | /* |
421 | * Will let policy->cpus know about dependency only when software | |
422 | * coordination is required. | |
423 | */ | |
424 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL || | |
425 | policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) | |
426 | policy->cpus = perf->shared_cpu_map; | |
09b4d1ee | 427 | |
152bf8c5 | 428 | if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) { |
1da177e4 LT |
429 | acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; |
430 | } | |
431 | ||
432 | /* capability check */ | |
09b4d1ee | 433 | if (perf->state_count <= 1) { |
1da177e4 LT |
434 | dprintk("No P-States\n"); |
435 | result = -ENODEV; | |
436 | goto err_unreg; | |
437 | } | |
09b4d1ee VP |
438 | |
439 | if ((perf->control_register.space_id != ACPI_ADR_SPACE_SYSTEM_IO) || | |
440 | (perf->status_register.space_id != ACPI_ADR_SPACE_SYSTEM_IO)) { | |
1da177e4 | 441 | dprintk("Unsupported address space [%d, %d]\n", |
09b4d1ee VP |
442 | (u32) (perf->control_register.space_id), |
443 | (u32) (perf->status_register.space_id)); | |
1da177e4 LT |
444 | result = -ENODEV; |
445 | goto err_unreg; | |
446 | } | |
447 | ||
448 | /* alloc freq_table */ | |
09b4d1ee | 449 | data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) * (perf->state_count + 1), GFP_KERNEL); |
1da177e4 LT |
450 | if (!data->freq_table) { |
451 | result = -ENOMEM; | |
452 | goto err_unreg; | |
453 | } | |
454 | ||
455 | /* detect transition latency */ | |
456 | policy->cpuinfo.transition_latency = 0; | |
09b4d1ee VP |
457 | for (i=0; i<perf->state_count; i++) { |
458 | if ((perf->states[i].transition_latency * 1000) > policy->cpuinfo.transition_latency) | |
459 | policy->cpuinfo.transition_latency = perf->states[i].transition_latency * 1000; | |
1da177e4 LT |
460 | } |
461 | policy->governor = CPUFREQ_DEFAULT_GOVERNOR; | |
462 | ||
463 | /* The current speed is unknown and not detectable by ACPI... */ | |
464 | policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); | |
465 | ||
466 | /* table init */ | |
09b4d1ee | 467 | for (i=0; i<=perf->state_count; i++) |
1da177e4 LT |
468 | { |
469 | data->freq_table[i].index = i; | |
09b4d1ee VP |
470 | if (i<perf->state_count) |
471 | data->freq_table[i].frequency = perf->states[i].core_frequency * 1000; | |
1da177e4 LT |
472 | else |
473 | data->freq_table[i].frequency = CPUFREQ_TABLE_END; | |
474 | } | |
475 | ||
476 | result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table); | |
477 | if (result) { | |
478 | goto err_freqfree; | |
479 | } | |
480 | ||
481 | /* notify BIOS that we exist */ | |
482 | acpi_processor_notify_smm(THIS_MODULE); | |
483 | ||
484 | printk(KERN_INFO "acpi-cpufreq: CPU%u - ACPI performance management activated.\n", | |
485 | cpu); | |
09b4d1ee | 486 | for (i = 0; i < perf->state_count; i++) |
1da177e4 | 487 | dprintk(" %cP%d: %d MHz, %d mW, %d uS\n", |
09b4d1ee VP |
488 | (i == perf->state?'*':' '), i, |
489 | (u32) perf->states[i].core_frequency, | |
490 | (u32) perf->states[i].power, | |
491 | (u32) perf->states[i].transition_latency); | |
1da177e4 LT |
492 | |
493 | cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu); | |
4b31e774 DB |
494 | |
495 | /* | |
496 | * the first call to ->target() should result in us actually | |
497 | * writing something to the appropriate registers. | |
498 | */ | |
499 | data->resume = 1; | |
500 | ||
1da177e4 LT |
501 | return (result); |
502 | ||
503 | err_freqfree: | |
504 | kfree(data->freq_table); | |
505 | err_unreg: | |
09b4d1ee | 506 | acpi_processor_unregister_performance(perf, cpu); |
1da177e4 LT |
507 | err_free: |
508 | kfree(data); | |
509 | acpi_io_data[cpu] = NULL; | |
510 | ||
511 | return (result); | |
512 | } | |
513 | ||
514 | ||
515 | static int | |
516 | acpi_cpufreq_cpu_exit ( | |
517 | struct cpufreq_policy *policy) | |
518 | { | |
519 | struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu]; | |
520 | ||
521 | ||
522 | dprintk("acpi_cpufreq_cpu_exit\n"); | |
523 | ||
524 | if (data) { | |
525 | cpufreq_frequency_table_put_attr(policy->cpu); | |
526 | acpi_io_data[policy->cpu] = NULL; | |
09b4d1ee | 527 | acpi_processor_unregister_performance(data->acpi_data, policy->cpu); |
1da177e4 LT |
528 | kfree(data); |
529 | } | |
530 | ||
531 | return (0); | |
532 | } | |
533 | ||
534 | static int | |
535 | acpi_cpufreq_resume ( | |
536 | struct cpufreq_policy *policy) | |
537 | { | |
538 | struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu]; | |
539 | ||
540 | ||
541 | dprintk("acpi_cpufreq_resume\n"); | |
542 | ||
543 | data->resume = 1; | |
544 | ||
545 | return (0); | |
546 | } | |
547 | ||
548 | ||
549 | static struct freq_attr* acpi_cpufreq_attr[] = { | |
550 | &cpufreq_freq_attr_scaling_available_freqs, | |
551 | NULL, | |
552 | }; | |
553 | ||
554 | static struct cpufreq_driver acpi_cpufreq_driver = { | |
911cb74b DJ |
555 | .verify = acpi_cpufreq_verify, |
556 | .target = acpi_cpufreq_target, | |
557 | .init = acpi_cpufreq_cpu_init, | |
558 | .exit = acpi_cpufreq_cpu_exit, | |
559 | .resume = acpi_cpufreq_resume, | |
560 | .name = "acpi-cpufreq", | |
561 | .owner = THIS_MODULE, | |
562 | .attr = acpi_cpufreq_attr, | |
563 | .flags = CPUFREQ_STICKY, | |
1da177e4 LT |
564 | }; |
565 | ||
566 | ||
567 | static int __init | |
568 | acpi_cpufreq_init (void) | |
569 | { | |
570 | int result = 0; | |
571 | ||
572 | dprintk("acpi_cpufreq_init\n"); | |
573 | ||
09b4d1ee VP |
574 | result = acpi_cpufreq_early_init_acpi(); |
575 | ||
576 | if (!result) | |
577 | result = cpufreq_register_driver(&acpi_cpufreq_driver); | |
1da177e4 LT |
578 | |
579 | return (result); | |
580 | } | |
581 | ||
582 | ||
583 | static void __exit | |
584 | acpi_cpufreq_exit (void) | |
585 | { | |
09b4d1ee | 586 | unsigned int i; |
1da177e4 LT |
587 | dprintk("acpi_cpufreq_exit\n"); |
588 | ||
589 | cpufreq_unregister_driver(&acpi_cpufreq_driver); | |
590 | ||
fb1bb34d | 591 | for_each_possible_cpu(i) { |
09b4d1ee VP |
592 | kfree(acpi_perf_data[i]); |
593 | acpi_perf_data[i] = NULL; | |
594 | } | |
1da177e4 LT |
595 | return; |
596 | } | |
597 | ||
d395bf12 VP |
598 | module_param(acpi_pstate_strict, uint, 0644); |
599 | MODULE_PARM_DESC(acpi_pstate_strict, "value 0 or non-zero. non-zero -> strict ACPI checks are performed during frequency changes."); | |
1da177e4 LT |
600 | |
601 | late_initcall(acpi_cpufreq_init); | |
602 | module_exit(acpi_cpufreq_exit); | |
603 | ||
604 | MODULE_ALIAS("acpi"); |