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1 | /* |
2 | * Based on documentation provided by Dave Jones. Thanks! |
3 | * |
4 | * Licensed under the terms of the GNU GPL License version 2. |
5 | * |
6 | * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous* |
7 | */ |
8 | |
9 | #include <linux/kernel.h> |
10 | #include <linux/module.h> |
11 | #include <linux/init.h> |
12 | #include <linux/cpufreq.h> |
13 | #include <linux/ioport.h> |
14 | #include <linux/slab.h> |
15 | #include <linux/timex.h> |
16 | #include <linux/io.h> |
17 | #include <linux/delay.h> |
18 | |
19 | #include <asm/cpu_device_id.h> |
20 | #include <asm/msr.h> |
21 | #include <asm/tsc.h> |
22 | |
23 | #if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE |
24 | #include <linux/acpi.h> |
25 | #include <acpi/processor.h> |
26 | #endif |
27 | |
28 | #define EPS_BRAND_C7M 0 |
29 | #define EPS_BRAND_C7 1 |
30 | #define EPS_BRAND_EDEN 2 |
31 | #define EPS_BRAND_C3 3 |
32 | #define EPS_BRAND_C7D 4 |
33 | |
34 | struct eps_cpu_data { |
35 | u32 fsb; |
36 | #if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE |
37 | u32 bios_limit; |
38 | #endif |
39 | struct cpufreq_frequency_table freq_table[]; |
40 | }; |
41 | |
42 | static struct eps_cpu_data *eps_cpu[NR_CPUS]; |
43 | |
44 | /* Module parameters */ |
45 | static int freq_failsafe_off; |
46 | static int voltage_failsafe_off; |
47 | static int set_max_voltage; |
48 | |
49 | #if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE |
50 | static int ignore_acpi_limit; |
51 | |
52 | static struct acpi_processor_performance *eps_acpi_cpu_perf; |
53 | |
54 | /* Minimum necessary to get acpi_processor_get_bios_limit() working */ |
55 | static int eps_acpi_init(void) |
56 | { |
57 | eps_acpi_cpu_perf = kzalloc(sizeof(struct acpi_processor_performance), |
58 | GFP_KERNEL); |
59 | if (!eps_acpi_cpu_perf) |
60 | return -ENOMEM; |
61 | |
62 | if (!zalloc_cpumask_var(&eps_acpi_cpu_perf->shared_cpu_map, |
63 | GFP_KERNEL)) { |
64 | kfree(eps_acpi_cpu_perf); |
65 | eps_acpi_cpu_perf = NULL; |
66 | return -ENOMEM; |
67 | } |
68 | |
69 | if (acpi_processor_register_performance(eps_acpi_cpu_perf, 0)) { |
70 | free_cpumask_var(eps_acpi_cpu_perf->shared_cpu_map); |
71 | kfree(eps_acpi_cpu_perf); |
72 | eps_acpi_cpu_perf = NULL; |
73 | return -EIO; |
74 | } |
75 | return 0; |
76 | } |
77 | |
78 | static int eps_acpi_exit(struct cpufreq_policy *policy) |
79 | { |
80 | if (eps_acpi_cpu_perf) { |
81 | acpi_processor_unregister_performance(eps_acpi_cpu_perf, 0); |
82 | free_cpumask_var(eps_acpi_cpu_perf->shared_cpu_map); |
83 | kfree(eps_acpi_cpu_perf); |
84 | eps_acpi_cpu_perf = NULL; |
85 | } |
86 | return 0; |
87 | } |
88 | #endif |
89 | |
90 | static unsigned int eps_get(unsigned int cpu) |
91 | { |
92 | struct eps_cpu_data *centaur; |
93 | u32 lo, hi; |
94 | |
95 | if (cpu) |
96 | return 0; |
97 | centaur = eps_cpu[cpu]; |
98 | if (centaur == NULL) |
99 | return 0; |
100 | |
101 | /* Return current frequency */ |
102 | rdmsr(MSR_IA32_PERF_STATUS, lo, hi); |
103 | return centaur->fsb * ((lo >> 8) & 0xff); |
104 | } |
105 | |
106 | static int eps_set_state(struct eps_cpu_data *centaur, |
107 | unsigned int cpu, |
108 | u32 dest_state) |
109 | { |
110 | struct cpufreq_freqs freqs; |
111 | u32 lo, hi; |
112 | int err = 0; |
113 | int i; |
114 | |
115 | freqs.old = eps_get(cpu); |
116 | freqs.new = centaur->fsb * ((dest_state >> 8) & 0xff); |
117 | freqs.cpu = cpu; |
118 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); |
119 | |
120 | /* Wait while CPU is busy */ |
121 | rdmsr(MSR_IA32_PERF_STATUS, lo, hi); |
122 | i = 0; |
123 | while (lo & ((1 << 16) | (1 << 17))) { |
124 | udelay(16); |
125 | rdmsr(MSR_IA32_PERF_STATUS, lo, hi); |
126 | i++; |
127 | if (unlikely(i > 64)) { |
128 | err = -ENODEV; |
129 | goto postchange; |
130 | } |
131 | } |
132 | /* Set new multiplier and voltage */ |
133 | wrmsr(MSR_IA32_PERF_CTL, dest_state & 0xffff, 0); |
134 | /* Wait until transition end */ |
135 | i = 0; |
136 | do { |
137 | udelay(16); |
138 | rdmsr(MSR_IA32_PERF_STATUS, lo, hi); |
139 | i++; |
140 | if (unlikely(i > 64)) { |
141 | err = -ENODEV; |
142 | goto postchange; |
143 | } |
144 | } while (lo & ((1 << 16) | (1 << 17))); |
145 | |
146 | /* Return current frequency */ |
147 | postchange: |
148 | rdmsr(MSR_IA32_PERF_STATUS, lo, hi); |
149 | freqs.new = centaur->fsb * ((lo >> 8) & 0xff); |
150 | |
151 | #ifdef DEBUG |
152 | { |
153 | u8 current_multiplier, current_voltage; |
154 | |
155 | /* Print voltage and multiplier */ |
156 | rdmsr(MSR_IA32_PERF_STATUS, lo, hi); |
157 | current_voltage = lo & 0xff; |
158 | printk(KERN_INFO "eps: Current voltage = %dmV\n", |
159 | current_voltage * 16 + 700); |
160 | current_multiplier = (lo >> 8) & 0xff; |
161 | printk(KERN_INFO "eps: Current multiplier = %d\n", |
162 | current_multiplier); |
163 | } |
164 | #endif |
165 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); |
166 | return err; |
167 | } |
168 | |
169 | static int eps_target(struct cpufreq_policy *policy, |
170 | unsigned int target_freq, |
171 | unsigned int relation) |
172 | { |
173 | struct eps_cpu_data *centaur; |
174 | unsigned int newstate = 0; |
175 | unsigned int cpu = policy->cpu; |
176 | unsigned int dest_state; |
177 | int ret; |
178 | |
179 | if (unlikely(eps_cpu[cpu] == NULL)) |
180 | return -ENODEV; |
181 | centaur = eps_cpu[cpu]; |
182 | |
183 | if (unlikely(cpufreq_frequency_table_target(policy, |
184 | &eps_cpu[cpu]->freq_table[0], |
185 | target_freq, |
186 | relation, |
187 | &newstate))) { |
188 | return -EINVAL; |
189 | } |
190 | |
191 | /* Make frequency transition */ |
192 | dest_state = centaur->freq_table[newstate].index & 0xffff; |
193 | ret = eps_set_state(centaur, cpu, dest_state); |
194 | if (ret) |
195 | printk(KERN_ERR "eps: Timeout!\n"); |
196 | return ret; |
197 | } |
198 | |
199 | static int eps_verify(struct cpufreq_policy *policy) |
200 | { |
201 | return cpufreq_frequency_table_verify(policy, |
202 | &eps_cpu[policy->cpu]->freq_table[0]); |
203 | } |
204 | |
205 | static int eps_cpu_init(struct cpufreq_policy *policy) |
206 | { |
207 | unsigned int i; |
208 | u32 lo, hi; |
209 | u64 val; |
210 | u8 current_multiplier, current_voltage; |
211 | u8 max_multiplier, max_voltage; |
212 | u8 min_multiplier, min_voltage; |
213 | u8 brand = 0; |
214 | u32 fsb; |
215 | struct eps_cpu_data *centaur; |
216 | struct cpuinfo_x86 *c = &cpu_data(0); |
217 | struct cpufreq_frequency_table *f_table; |
218 | int k, step, voltage; |
219 | int ret; |
220 | int states; |
221 | #if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE |
222 | unsigned int limit; |
223 | #endif |
224 | |
225 | if (policy->cpu != 0) |
226 | return -ENODEV; |
227 | |
228 | /* Check brand */ |
229 | printk(KERN_INFO "eps: Detected VIA "); |
230 | |
231 | switch (c->x86_model) { |
232 | case 10: |
233 | rdmsr(0x1153, lo, hi); |
234 | brand = (((lo >> 2) ^ lo) >> 18) & 3; |
235 | printk(KERN_CONT "Model A "); |
236 | break; |
237 | case 13: |
238 | rdmsr(0x1154, lo, hi); |
239 | brand = (((lo >> 4) ^ (lo >> 2))) & 0x000000ff; |
240 | printk(KERN_CONT "Model D "); |
241 | break; |
242 | } |
243 | |
244 | switch (brand) { |
245 | case EPS_BRAND_C7M: |
246 | printk(KERN_CONT "C7-M\n"); |
247 | break; |
248 | case EPS_BRAND_C7: |
249 | printk(KERN_CONT "C7\n"); |
250 | break; |
251 | case EPS_BRAND_EDEN: |
252 | printk(KERN_CONT "Eden\n"); |
253 | break; |
254 | case EPS_BRAND_C7D: |
255 | printk(KERN_CONT "C7-D\n"); |
256 | break; |
257 | case EPS_BRAND_C3: |
258 | printk(KERN_CONT "C3\n"); |
259 | return -ENODEV; |
260 | break; |
261 | } |
262 | /* Enable Enhanced PowerSaver */ |
263 | rdmsrl(MSR_IA32_MISC_ENABLE, val); |
264 | if (!(val & MSR_IA32_MISC_ENABLE_ENHANCED_SPEEDSTEP)) { |
265 | val |= MSR_IA32_MISC_ENABLE_ENHANCED_SPEEDSTEP; |
266 | wrmsrl(MSR_IA32_MISC_ENABLE, val); |
267 | /* Can be locked at 0 */ |
268 | rdmsrl(MSR_IA32_MISC_ENABLE, val); |
269 | if (!(val & MSR_IA32_MISC_ENABLE_ENHANCED_SPEEDSTEP)) { |
270 | printk(KERN_INFO "eps: Can't enable Enhanced PowerSaver\n"); |
271 | return -ENODEV; |
272 | } |
273 | } |
274 | |
275 | /* Print voltage and multiplier */ |
276 | rdmsr(MSR_IA32_PERF_STATUS, lo, hi); |
277 | current_voltage = lo & 0xff; |
278 | printk(KERN_INFO "eps: Current voltage = %dmV\n", |
279 | current_voltage * 16 + 700); |
280 | current_multiplier = (lo >> 8) & 0xff; |
281 | printk(KERN_INFO "eps: Current multiplier = %d\n", current_multiplier); |
282 | |
283 | /* Print limits */ |
284 | max_voltage = hi & 0xff; |
285 | printk(KERN_INFO "eps: Highest voltage = %dmV\n", |
286 | max_voltage * 16 + 700); |
287 | max_multiplier = (hi >> 8) & 0xff; |
288 | printk(KERN_INFO "eps: Highest multiplier = %d\n", max_multiplier); |
289 | min_voltage = (hi >> 16) & 0xff; |
290 | printk(KERN_INFO "eps: Lowest voltage = %dmV\n", |
291 | min_voltage * 16 + 700); |
292 | min_multiplier = (hi >> 24) & 0xff; |
293 | printk(KERN_INFO "eps: Lowest multiplier = %d\n", min_multiplier); |
294 | |
295 | /* Sanity checks */ |
296 | if (current_multiplier == 0 || max_multiplier == 0 |
297 | || min_multiplier == 0) |
298 | return -EINVAL; |
299 | if (current_multiplier > max_multiplier |
300 | || max_multiplier <= min_multiplier) |
301 | return -EINVAL; |
302 | if (current_voltage > 0x1f || max_voltage > 0x1f) |
303 | return -EINVAL; |
304 | if (max_voltage < min_voltage |
305 | || current_voltage < min_voltage |
306 | || current_voltage > max_voltage) |
307 | return -EINVAL; |
308 | |
309 | /* Check for systems using underclocked CPU */ |
310 | if (!freq_failsafe_off && max_multiplier != current_multiplier) { |
311 | printk(KERN_INFO "eps: Your processor is running at different " |
312 | "frequency then its maximum. Aborting.\n"); |
313 | printk(KERN_INFO "eps: You can use freq_failsafe_off option " |
314 | "to disable this check.\n"); |
315 | return -EINVAL; |
316 | } |
317 | if (!voltage_failsafe_off && max_voltage != current_voltage) { |
318 | printk(KERN_INFO "eps: Your processor is running at different " |
319 | "voltage then its maximum. Aborting.\n"); |
320 | printk(KERN_INFO "eps: You can use voltage_failsafe_off " |
321 | "option to disable this check.\n"); |
322 | return -EINVAL; |
323 | } |
324 | |
325 | /* Calc FSB speed */ |
326 | fsb = cpu_khz / current_multiplier; |
327 | |
328 | #if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE |
329 | /* Check for ACPI processor speed limit */ |
330 | if (!ignore_acpi_limit && !eps_acpi_init()) { |
331 | if (!acpi_processor_get_bios_limit(policy->cpu, &limit)) { |
332 | printk(KERN_INFO "eps: ACPI limit %u.%uGHz\n", |
333 | limit/1000000, |
334 | (limit%1000000)/10000); |
335 | eps_acpi_exit(policy); |
336 | /* Check if max_multiplier is in BIOS limits */ |
337 | if (limit && max_multiplier * fsb > limit) { |
338 | printk(KERN_INFO "eps: Aborting.\n"); |
339 | return -EINVAL; |
340 | } |
341 | } |
342 | } |
343 | #endif |
344 | |
345 | /* Allow user to set lower maximum voltage then that reported |
346 | * by processor */ |
347 | if (brand == EPS_BRAND_C7M && set_max_voltage) { |
348 | u32 v; |
349 | |
350 | /* Change mV to something hardware can use */ |
351 | v = (set_max_voltage - 700) / 16; |
352 | /* Check if voltage is within limits */ |
353 | if (v >= min_voltage && v <= max_voltage) { |
354 | printk(KERN_INFO "eps: Setting %dmV as maximum.\n", |
355 | v * 16 + 700); |
356 | max_voltage = v; |
357 | } |
358 | } |
359 | |
360 | /* Calc number of p-states supported */ |
361 | if (brand == EPS_BRAND_C7M) |
362 | states = max_multiplier - min_multiplier + 1; |
363 | else |
364 | states = 2; |
365 | |
366 | /* Allocate private data and frequency table for current cpu */ |
367 | centaur = kzalloc(sizeof(struct eps_cpu_data) |
368 | + (states + 1) * sizeof(struct cpufreq_frequency_table), |
369 | GFP_KERNEL); |
370 | if (!centaur) |
371 | return -ENOMEM; |
372 | eps_cpu[0] = centaur; |
373 | |
374 | /* Copy basic values */ |
375 | centaur->fsb = fsb; |
376 | #if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE |
377 | centaur->bios_limit = limit; |
378 | #endif |
379 | |
380 | /* Fill frequency and MSR value table */ |
381 | f_table = ¢aur->freq_table[0]; |
382 | if (brand != EPS_BRAND_C7M) { |
383 | f_table[0].frequency = fsb * min_multiplier; |
384 | f_table[0].index = (min_multiplier << 8) | min_voltage; |
385 | f_table[1].frequency = fsb * max_multiplier; |
386 | f_table[1].index = (max_multiplier << 8) | max_voltage; |
387 | f_table[2].frequency = CPUFREQ_TABLE_END; |
388 | } else { |
389 | k = 0; |
390 | step = ((max_voltage - min_voltage) * 256) |
391 | / (max_multiplier - min_multiplier); |
392 | for (i = min_multiplier; i <= max_multiplier; i++) { |
393 | voltage = (k * step) / 256 + min_voltage; |
394 | f_table[k].frequency = fsb * i; |
395 | f_table[k].index = (i << 8) | voltage; |
396 | k++; |
397 | } |
398 | f_table[k].frequency = CPUFREQ_TABLE_END; |
399 | } |
400 | |
401 | policy->cpuinfo.transition_latency = 140000; /* 844mV -> 700mV in ns */ |
402 | policy->cur = fsb * current_multiplier; |
403 | |
404 | ret = cpufreq_frequency_table_cpuinfo(policy, ¢aur->freq_table[0]); |
405 | if (ret) { |
406 | kfree(centaur); |
407 | return ret; |
408 | } |
409 | |
410 | cpufreq_frequency_table_get_attr(¢aur->freq_table[0], policy->cpu); |
411 | return 0; |
412 | } |
413 | |
414 | static int eps_cpu_exit(struct cpufreq_policy *policy) |
415 | { |
416 | unsigned int cpu = policy->cpu; |
417 | |
418 | /* Bye */ |
419 | cpufreq_frequency_table_put_attr(policy->cpu); |
420 | kfree(eps_cpu[cpu]); |
421 | eps_cpu[cpu] = NULL; |
422 | return 0; |
423 | } |
424 | |
425 | static struct freq_attr *eps_attr[] = { |
426 | &cpufreq_freq_attr_scaling_available_freqs, |
427 | NULL, |
428 | }; |
429 | |
430 | static struct cpufreq_driver eps_driver = { |
431 | .verify = eps_verify, |
432 | .target = eps_target, |
433 | .init = eps_cpu_init, |
434 | .exit = eps_cpu_exit, |
435 | .get = eps_get, |
436 | .name = "e_powersaver", |
437 | .owner = THIS_MODULE, |
438 | .attr = eps_attr, |
439 | }; |
440 | |
441 | |
442 | /* This driver will work only on Centaur C7 processors with |
443 | * Enhanced SpeedStep/PowerSaver registers */ |
444 | static const struct x86_cpu_id eps_cpu_id[] = { |
445 | { X86_VENDOR_CENTAUR, 6, X86_MODEL_ANY, X86_FEATURE_EST }, |
446 | {} |
447 | }; |
448 | MODULE_DEVICE_TABLE(x86cpu, eps_cpu_id); |
449 | |
450 | static int __init eps_init(void) |
451 | { |
452 | if (!x86_match_cpu(eps_cpu_id) || boot_cpu_data.x86_model < 10) |
453 | return -ENODEV; |
454 | if (cpufreq_register_driver(&eps_driver)) |
455 | return -EINVAL; |
456 | return 0; |
457 | } |
458 | |
459 | static void __exit eps_exit(void) |
460 | { |
461 | cpufreq_unregister_driver(&eps_driver); |
462 | } |
463 | |
464 | /* Allow user to overclock his machine or to change frequency to higher after |
465 | * unloading module */ |
466 | module_param(freq_failsafe_off, int, 0644); |
467 | MODULE_PARM_DESC(freq_failsafe_off, "Disable current vs max frequency check"); |
468 | module_param(voltage_failsafe_off, int, 0644); |
469 | MODULE_PARM_DESC(voltage_failsafe_off, "Disable current vs max voltage check"); |
470 | #if defined CONFIG_ACPI_PROCESSOR || defined CONFIG_ACPI_PROCESSOR_MODULE |
471 | module_param(ignore_acpi_limit, int, 0644); |
472 | MODULE_PARM_DESC(ignore_acpi_limit, "Don't check ACPI's processor speed limit"); |
473 | #endif |
474 | module_param(set_max_voltage, int, 0644); |
475 | MODULE_PARM_DESC(set_max_voltage, "Set maximum CPU voltage (mV) C7-M only"); |
476 | |
477 | MODULE_AUTHOR("Rafal Bilski <rafalbilski@interia.pl>"); |
478 | MODULE_DESCRIPTION("Enhanced PowerSaver driver for VIA C7 CPU's."); |
479 | MODULE_LICENSE("GPL"); |
480 | |
481 | module_init(eps_init); |
482 | module_exit(eps_exit); |
483 |
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