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