Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * AMD K7 Powernow driver. | |
3 | * (C) 2003 Dave Jones <davej@codemonkey.org.uk> on behalf of SuSE Labs. | |
4 | * (C) 2003-2004 Dave Jones <davej@redhat.com> | |
5 | * | |
6 | * Licensed under the terms of the GNU GPL License version 2. | |
7 | * Based upon datasheets & sample CPUs kindly provided by AMD. | |
8 | * | |
9 | * Errata 5: Processor may fail to execute a FID/VID change in presence of interrupt. | |
10 | * - We cli/sti on stepping A0 CPUs around the FID/VID transition. | |
11 | * Errata 15: Processors with half frequency multipliers may hang upon wakeup from disconnect. | |
12 | * - We disable half multipliers if ACPI is used on A0 stepping CPUs. | |
13 | */ | |
14 | ||
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/moduleparam.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/cpufreq.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/dmi.h> | |
23 | ||
24 | #include <asm/msr.h> | |
91350ed4 | 25 | #include <asm/timer.h> |
1da177e4 LT |
26 | #include <asm/timex.h> |
27 | #include <asm/io.h> | |
28 | #include <asm/system.h> | |
29 | ||
30 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
31 | #include <linux/acpi.h> | |
32 | #include <acpi/processor.h> | |
33 | #endif | |
34 | ||
35 | #include "powernow-k7.h" | |
36 | ||
37 | #define PFX "powernow: " | |
38 | ||
39 | ||
40 | struct psb_s { | |
41 | u8 signature[10]; | |
42 | u8 tableversion; | |
43 | u8 flags; | |
44 | u16 settlingtime; | |
45 | u8 reserved1; | |
46 | u8 numpst; | |
47 | }; | |
48 | ||
49 | struct pst_s { | |
50 | u32 cpuid; | |
51 | u8 fsbspeed; | |
52 | u8 maxfid; | |
53 | u8 startvid; | |
54 | u8 numpstates; | |
55 | }; | |
56 | ||
57 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
58 | union powernow_acpi_control_t { | |
59 | struct { | |
60 | unsigned long fid:5, | |
61 | vid:5, | |
62 | sgtc:20, | |
63 | res1:2; | |
64 | } bits; | |
65 | unsigned long val; | |
66 | }; | |
67 | #endif | |
68 | ||
69 | #ifdef CONFIG_CPU_FREQ_DEBUG | |
70 | /* divide by 1000 to get VCore voltage in V. */ | |
bd5ab26a | 71 | static const int mobile_vid_table[32] = { |
1da177e4 LT |
72 | 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650, |
73 | 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0, | |
74 | 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100, | |
75 | 1075, 1050, 1025, 1000, 975, 950, 925, 0, | |
76 | }; | |
77 | #endif | |
78 | ||
79 | /* divide by 10 to get FID. */ | |
bd5ab26a | 80 | static const int fid_codes[32] = { |
1da177e4 LT |
81 | 110, 115, 120, 125, 50, 55, 60, 65, |
82 | 70, 75, 80, 85, 90, 95, 100, 105, | |
83 | 30, 190, 40, 200, 130, 135, 140, 210, | |
84 | 150, 225, 160, 165, 170, 180, -1, -1, | |
85 | }; | |
86 | ||
87 | /* This parameter is used in order to force ACPI instead of legacy method for | |
88 | * configuration purpose. | |
89 | */ | |
90 | ||
91 | static int acpi_force; | |
92 | ||
93 | static struct cpufreq_frequency_table *powernow_table; | |
94 | ||
95 | static unsigned int can_scale_bus; | |
96 | static unsigned int can_scale_vid; | |
97 | static unsigned int minimum_speed=-1; | |
98 | static unsigned int maximum_speed; | |
99 | static unsigned int number_scales; | |
100 | static unsigned int fsb; | |
101 | static unsigned int latency; | |
102 | static char have_a0; | |
103 | ||
104 | #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "powernow-k7", msg) | |
105 | ||
106 | static int check_fsb(unsigned int fsbspeed) | |
107 | { | |
108 | int delta; | |
109 | unsigned int f = fsb / 1000; | |
110 | ||
111 | delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed; | |
112 | return (delta < 5); | |
113 | } | |
114 | ||
115 | static int check_powernow(void) | |
116 | { | |
117 | struct cpuinfo_x86 *c = cpu_data; | |
118 | unsigned int maxei, eax, ebx, ecx, edx; | |
119 | ||
120 | if ((c->x86_vendor != X86_VENDOR_AMD) || (c->x86 !=6)) { | |
121 | #ifdef MODULE | |
122 | printk (KERN_INFO PFX "This module only works with AMD K7 CPUs\n"); | |
123 | #endif | |
124 | return 0; | |
125 | } | |
126 | ||
127 | /* Get maximum capabilities */ | |
128 | maxei = cpuid_eax (0x80000000); | |
129 | if (maxei < 0x80000007) { /* Any powernow info ? */ | |
130 | #ifdef MODULE | |
131 | printk (KERN_INFO PFX "No powernow capabilities detected\n"); | |
132 | #endif | |
133 | return 0; | |
134 | } | |
135 | ||
136 | if ((c->x86_model == 6) && (c->x86_mask == 0)) { | |
137 | printk (KERN_INFO PFX "K7 660[A0] core detected, enabling errata workarounds\n"); | |
138 | have_a0 = 1; | |
139 | } | |
140 | ||
141 | cpuid(0x80000007, &eax, &ebx, &ecx, &edx); | |
142 | ||
143 | /* Check we can actually do something before we say anything.*/ | |
144 | if (!(edx & (1 << 1 | 1 << 2))) | |
145 | return 0; | |
146 | ||
147 | printk (KERN_INFO PFX "PowerNOW! Technology present. Can scale: "); | |
148 | ||
149 | if (edx & 1 << 1) { | |
150 | printk ("frequency"); | |
151 | can_scale_bus=1; | |
152 | } | |
153 | ||
154 | if ((edx & (1 << 1 | 1 << 2)) == 0x6) | |
155 | printk (" and "); | |
156 | ||
157 | if (edx & 1 << 2) { | |
158 | printk ("voltage"); | |
159 | can_scale_vid=1; | |
160 | } | |
161 | ||
162 | printk (".\n"); | |
163 | return 1; | |
164 | } | |
165 | ||
166 | ||
167 | static int get_ranges (unsigned char *pst) | |
168 | { | |
169 | unsigned int j; | |
170 | unsigned int speed; | |
171 | u8 fid, vid; | |
172 | ||
bfdc708d | 173 | powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * (number_scales + 1)), GFP_KERNEL); |
1da177e4 LT |
174 | if (!powernow_table) |
175 | return -ENOMEM; | |
1da177e4 LT |
176 | |
177 | for (j=0 ; j < number_scales; j++) { | |
178 | fid = *pst++; | |
179 | ||
180 | powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10; | |
181 | powernow_table[j].index = fid; /* lower 8 bits */ | |
182 | ||
183 | speed = powernow_table[j].frequency; | |
184 | ||
185 | if ((fid_codes[fid] % 10)==5) { | |
186 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
187 | if (have_a0 == 1) | |
188 | powernow_table[j].frequency = CPUFREQ_ENTRY_INVALID; | |
189 | #endif | |
190 | } | |
191 | ||
192 | if (speed < minimum_speed) | |
193 | minimum_speed = speed; | |
194 | if (speed > maximum_speed) | |
195 | maximum_speed = speed; | |
196 | ||
197 | vid = *pst++; | |
198 | powernow_table[j].index |= (vid << 8); /* upper 8 bits */ | |
199 | ||
200 | dprintk (" FID: 0x%x (%d.%dx [%dMHz]) " | |
32ee8c3e DJ |
201 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
202 | fid_codes[fid] % 10, speed/1000, vid, | |
1da177e4 LT |
203 | mobile_vid_table[vid]/1000, |
204 | mobile_vid_table[vid]%1000); | |
205 | } | |
206 | powernow_table[number_scales].frequency = CPUFREQ_TABLE_END; | |
207 | powernow_table[number_scales].index = 0; | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | ||
213 | static void change_FID(int fid) | |
214 | { | |
215 | union msr_fidvidctl fidvidctl; | |
216 | ||
217 | rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val); | |
218 | if (fidvidctl.bits.FID != fid) { | |
219 | fidvidctl.bits.SGTC = latency; | |
220 | fidvidctl.bits.FID = fid; | |
221 | fidvidctl.bits.VIDC = 0; | |
222 | fidvidctl.bits.FIDC = 1; | |
223 | wrmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val); | |
224 | } | |
225 | } | |
226 | ||
227 | ||
228 | static void change_VID(int vid) | |
229 | { | |
230 | union msr_fidvidctl fidvidctl; | |
231 | ||
232 | rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val); | |
233 | if (fidvidctl.bits.VID != vid) { | |
234 | fidvidctl.bits.SGTC = latency; | |
235 | fidvidctl.bits.VID = vid; | |
236 | fidvidctl.bits.FIDC = 0; | |
237 | fidvidctl.bits.VIDC = 1; | |
238 | wrmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val); | |
239 | } | |
240 | } | |
241 | ||
242 | ||
243 | static void change_speed (unsigned int index) | |
244 | { | |
245 | u8 fid, vid; | |
246 | struct cpufreq_freqs freqs; | |
247 | union msr_fidvidstatus fidvidstatus; | |
248 | int cfid; | |
249 | ||
250 | /* fid are the lower 8 bits of the index we stored into | |
251 | * the cpufreq frequency table in powernow_decode_bios, | |
252 | * vid are the upper 8 bits. | |
253 | */ | |
254 | ||
255 | fid = powernow_table[index].index & 0xFF; | |
256 | vid = (powernow_table[index].index & 0xFF00) >> 8; | |
257 | ||
258 | freqs.cpu = 0; | |
259 | ||
260 | rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val); | |
261 | cfid = fidvidstatus.bits.CFID; | |
262 | freqs.old = fsb * fid_codes[cfid] / 10; | |
263 | ||
264 | freqs.new = powernow_table[index].frequency; | |
265 | ||
266 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
267 | ||
268 | /* Now do the magic poking into the MSRs. */ | |
269 | ||
270 | if (have_a0 == 1) /* A0 errata 5 */ | |
271 | local_irq_disable(); | |
272 | ||
273 | if (freqs.old > freqs.new) { | |
274 | /* Going down, so change FID first */ | |
275 | change_FID(fid); | |
276 | change_VID(vid); | |
277 | } else { | |
278 | /* Going up, so change VID first */ | |
279 | change_VID(vid); | |
280 | change_FID(fid); | |
281 | } | |
282 | ||
283 | ||
284 | if (have_a0 == 1) | |
285 | local_irq_enable(); | |
286 | ||
287 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
288 | } | |
289 | ||
290 | ||
291 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
292 | ||
293 | static struct acpi_processor_performance *acpi_processor_perf; | |
294 | ||
295 | static int powernow_acpi_init(void) | |
296 | { | |
297 | int i; | |
298 | int retval = 0; | |
299 | union powernow_acpi_control_t pc; | |
300 | ||
301 | if (acpi_processor_perf != NULL && powernow_table != NULL) { | |
302 | retval = -EINVAL; | |
303 | goto err0; | |
304 | } | |
305 | ||
bfdc708d | 306 | acpi_processor_perf = kzalloc(sizeof(struct acpi_processor_performance), |
1da177e4 | 307 | GFP_KERNEL); |
1da177e4 LT |
308 | if (!acpi_processor_perf) { |
309 | retval = -ENOMEM; | |
310 | goto err0; | |
311 | } | |
312 | ||
1da177e4 LT |
313 | if (acpi_processor_register_performance(acpi_processor_perf, 0)) { |
314 | retval = -EIO; | |
315 | goto err1; | |
316 | } | |
317 | ||
318 | if (acpi_processor_perf->control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
319 | retval = -ENODEV; | |
320 | goto err2; | |
321 | } | |
322 | ||
323 | if (acpi_processor_perf->status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
324 | retval = -ENODEV; | |
325 | goto err2; | |
326 | } | |
327 | ||
328 | number_scales = acpi_processor_perf->state_count; | |
329 | ||
330 | if (number_scales < 2) { | |
331 | retval = -ENODEV; | |
332 | goto err2; | |
333 | } | |
334 | ||
bfdc708d | 335 | powernow_table = kzalloc((number_scales + 1) * (sizeof(struct cpufreq_frequency_table)), GFP_KERNEL); |
1da177e4 LT |
336 | if (!powernow_table) { |
337 | retval = -ENOMEM; | |
338 | goto err2; | |
339 | } | |
340 | ||
1da177e4 LT |
341 | pc.val = (unsigned long) acpi_processor_perf->states[0].control; |
342 | for (i = 0; i < number_scales; i++) { | |
343 | u8 fid, vid; | |
dc2585eb DD |
344 | struct acpi_processor_px *state = |
345 | &acpi_processor_perf->states[i]; | |
346 | unsigned int speed, speed_mhz; | |
1da177e4 | 347 | |
dc2585eb | 348 | pc.val = (unsigned long) state->control; |
1da177e4 LT |
349 | dprintk ("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n", |
350 | i, | |
dc2585eb DD |
351 | (u32) state->core_frequency, |
352 | (u32) state->power, | |
353 | (u32) state->transition_latency, | |
354 | (u32) state->control, | |
1da177e4 LT |
355 | pc.bits.sgtc); |
356 | ||
357 | vid = pc.bits.vid; | |
358 | fid = pc.bits.fid; | |
359 | ||
360 | powernow_table[i].frequency = fsb * fid_codes[fid] / 10; | |
361 | powernow_table[i].index = fid; /* lower 8 bits */ | |
362 | powernow_table[i].index |= (vid << 8); /* upper 8 bits */ | |
363 | ||
364 | speed = powernow_table[i].frequency; | |
dc2585eb DD |
365 | speed_mhz = speed / 1000; |
366 | ||
367 | /* processor_perflib will multiply the MHz value by 1000 to | |
368 | * get a KHz value (e.g. 1266000). However, powernow-k7 works | |
369 | * with true KHz values (e.g. 1266768). To ensure that all | |
370 | * powernow frequencies are available, we must ensure that | |
371 | * ACPI doesn't restrict them, so we round up the MHz value | |
372 | * to ensure that perflib's computed KHz value is greater than | |
373 | * or equal to powernow's KHz value. | |
374 | */ | |
375 | if (speed % 1000 > 0) | |
376 | speed_mhz++; | |
1da177e4 LT |
377 | |
378 | if ((fid_codes[fid] % 10)==5) { | |
379 | if (have_a0 == 1) | |
380 | powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID; | |
381 | } | |
382 | ||
383 | dprintk (" FID: 0x%x (%d.%dx [%dMHz]) " | |
32ee8c3e | 384 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
dc2585eb | 385 | fid_codes[fid] % 10, speed_mhz, vid, |
1da177e4 LT |
386 | mobile_vid_table[vid]/1000, |
387 | mobile_vid_table[vid]%1000); | |
388 | ||
dc2585eb DD |
389 | if (state->core_frequency != speed_mhz) { |
390 | state->core_frequency = speed_mhz; | |
391 | dprintk(" Corrected ACPI frequency to %d\n", | |
392 | speed_mhz); | |
393 | } | |
394 | ||
1da177e4 LT |
395 | if (latency < pc.bits.sgtc) |
396 | latency = pc.bits.sgtc; | |
397 | ||
398 | if (speed < minimum_speed) | |
399 | minimum_speed = speed; | |
400 | if (speed > maximum_speed) | |
401 | maximum_speed = speed; | |
402 | } | |
403 | ||
404 | powernow_table[i].frequency = CPUFREQ_TABLE_END; | |
405 | powernow_table[i].index = 0; | |
406 | ||
407 | /* notify BIOS that we exist */ | |
408 | acpi_processor_notify_smm(THIS_MODULE); | |
409 | ||
410 | return 0; | |
411 | ||
412 | err2: | |
413 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
414 | err1: | |
415 | kfree(acpi_processor_perf); | |
416 | err0: | |
417 | printk(KERN_WARNING PFX "ACPI perflib can not be used in this platform\n"); | |
418 | acpi_processor_perf = NULL; | |
419 | return retval; | |
420 | } | |
421 | #else | |
422 | static int powernow_acpi_init(void) | |
423 | { | |
424 | printk(KERN_INFO PFX "no support for ACPI processor found." | |
425 | " Please recompile your kernel with ACPI processor\n"); | |
426 | return -EINVAL; | |
427 | } | |
428 | #endif | |
429 | ||
430 | static int powernow_decode_bios (int maxfid, int startvid) | |
431 | { | |
432 | struct psb_s *psb; | |
433 | struct pst_s *pst; | |
434 | unsigned int i, j; | |
435 | unsigned char *p; | |
436 | unsigned int etuple; | |
437 | unsigned int ret; | |
438 | ||
439 | etuple = cpuid_eax(0x80000001); | |
440 | ||
441 | for (i=0xC0000; i < 0xffff0 ; i+=16) { | |
442 | ||
443 | p = phys_to_virt(i); | |
444 | ||
445 | if (memcmp(p, "AMDK7PNOW!", 10) == 0){ | |
446 | dprintk ("Found PSB header at %p\n", p); | |
447 | psb = (struct psb_s *) p; | |
448 | dprintk ("Table version: 0x%x\n", psb->tableversion); | |
449 | if (psb->tableversion != 0x12) { | |
450 | printk (KERN_INFO PFX "Sorry, only v1.2 tables supported right now\n"); | |
451 | return -ENODEV; | |
452 | } | |
453 | ||
454 | dprintk ("Flags: 0x%x\n", psb->flags); | |
455 | if ((psb->flags & 1)==0) { | |
456 | dprintk ("Mobile voltage regulator\n"); | |
457 | } else { | |
458 | dprintk ("Desktop voltage regulator\n"); | |
459 | } | |
460 | ||
461 | latency = psb->settlingtime; | |
462 | if (latency < 100) { | |
463 | printk (KERN_INFO PFX "BIOS set settling time to %d microseconds." | |
464 | "Should be at least 100. Correcting.\n", latency); | |
465 | latency = 100; | |
466 | } | |
467 | dprintk ("Settling Time: %d microseconds.\n", psb->settlingtime); | |
468 | dprintk ("Has %d PST tables. (Only dumping ones relevant to this CPU).\n", psb->numpst); | |
469 | ||
470 | p += sizeof (struct psb_s); | |
471 | ||
472 | pst = (struct pst_s *) p; | |
473 | ||
8cbe0169 | 474 | for (j=0; j<psb->numpst; j++) { |
1da177e4 LT |
475 | pst = (struct pst_s *) p; |
476 | number_scales = pst->numpstates; | |
477 | ||
478 | if ((etuple == pst->cpuid) && check_fsb(pst->fsbspeed) && | |
479 | (maxfid==pst->maxfid) && (startvid==pst->startvid)) | |
480 | { | |
8cbe0169 | 481 | dprintk ("PST:%d (@%p)\n", j, pst); |
32ee8c3e | 482 | dprintk (" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n", |
1da177e4 LT |
483 | pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid); |
484 | ||
485 | ret = get_ranges ((char *) pst + sizeof (struct pst_s)); | |
486 | return ret; | |
1da177e4 | 487 | } else { |
8cbe0169 | 488 | unsigned int k; |
1da177e4 | 489 | p = (char *) pst + sizeof (struct pst_s); |
8cbe0169 | 490 | for (k=0; k<number_scales; k++) |
1da177e4 LT |
491 | p+=2; |
492 | } | |
493 | } | |
494 | printk (KERN_INFO PFX "No PST tables match this cpuid (0x%x)\n", etuple); | |
495 | printk (KERN_INFO PFX "This is indicative of a broken BIOS.\n"); | |
496 | ||
497 | return -EINVAL; | |
498 | } | |
499 | p++; | |
500 | } | |
501 | ||
502 | return -ENODEV; | |
503 | } | |
504 | ||
505 | ||
506 | static int powernow_target (struct cpufreq_policy *policy, | |
507 | unsigned int target_freq, | |
508 | unsigned int relation) | |
509 | { | |
510 | unsigned int newstate; | |
511 | ||
512 | if (cpufreq_frequency_table_target(policy, powernow_table, target_freq, relation, &newstate)) | |
513 | return -EINVAL; | |
514 | ||
515 | change_speed(newstate); | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | ||
521 | static int powernow_verify (struct cpufreq_policy *policy) | |
522 | { | |
523 | return cpufreq_frequency_table_verify(policy, powernow_table); | |
524 | } | |
525 | ||
526 | /* | |
527 | * We use the fact that the bus frequency is somehow | |
528 | * a multiple of 100000/3 khz, then we compute sgtc according | |
529 | * to this multiple. | |
530 | * That way, we match more how AMD thinks all of that work. | |
531 | * We will then get the same kind of behaviour already tested under | |
532 | * the "well-known" other OS. | |
533 | */ | |
534 | static int __init fixup_sgtc(void) | |
535 | { | |
536 | unsigned int sgtc; | |
537 | unsigned int m; | |
538 | ||
539 | m = fsb / 3333; | |
540 | if ((m % 10) >= 5) | |
541 | m += 5; | |
542 | ||
543 | m /= 10; | |
544 | ||
545 | sgtc = 100 * m * latency; | |
546 | sgtc = sgtc / 3; | |
547 | if (sgtc > 0xfffff) { | |
548 | printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc); | |
549 | sgtc = 0xfffff; | |
550 | } | |
551 | return sgtc; | |
552 | } | |
553 | ||
554 | static unsigned int powernow_get(unsigned int cpu) | |
555 | { | |
556 | union msr_fidvidstatus fidvidstatus; | |
557 | unsigned int cfid; | |
558 | ||
559 | if (cpu) | |
560 | return 0; | |
561 | rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val); | |
562 | cfid = fidvidstatus.bits.CFID; | |
563 | ||
564 | return (fsb * fid_codes[cfid] / 10); | |
565 | } | |
566 | ||
567 | ||
568 | static int __init acer_cpufreq_pst(struct dmi_system_id *d) | |
569 | { | |
570 | printk(KERN_WARNING "%s laptop with broken PST tables in BIOS detected.\n", d->ident); | |
571 | printk(KERN_WARNING "You need to downgrade to 3A21 (09/09/2002), or try a newer BIOS than 3A71 (01/20/2003)\n"); | |
572 | printk(KERN_WARNING "cpufreq scaling has been disabled as a result of this.\n"); | |
573 | return 0; | |
574 | } | |
575 | ||
576 | /* | |
577 | * Some Athlon laptops have really fucked PST tables. | |
578 | * A BIOS update is all that can save them. | |
579 | * Mention this, and disable cpufreq. | |
580 | */ | |
581 | static struct dmi_system_id __initdata powernow_dmi_table[] = { | |
582 | { | |
583 | .callback = acer_cpufreq_pst, | |
584 | .ident = "Acer Aspire", | |
585 | .matches = { | |
586 | DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"), | |
587 | DMI_MATCH(DMI_BIOS_VERSION, "3A71"), | |
588 | }, | |
589 | }, | |
590 | { } | |
591 | }; | |
592 | ||
593 | static int __init powernow_cpu_init (struct cpufreq_policy *policy) | |
594 | { | |
595 | union msr_fidvidstatus fidvidstatus; | |
596 | int result; | |
597 | ||
598 | if (policy->cpu != 0) | |
599 | return -ENODEV; | |
600 | ||
601 | rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val); | |
602 | ||
436fe7b8 | 603 | recalibrate_cpu_khz(); |
91350ed4 DJ |
604 | |
605 | fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID]; | |
1da177e4 LT |
606 | if (!fsb) { |
607 | printk(KERN_WARNING PFX "can not determine bus frequency\n"); | |
608 | return -EINVAL; | |
609 | } | |
7eb53d88 | 610 | dprintk("FSB: %3dMHz\n", fsb/1000); |
1da177e4 LT |
611 | |
612 | if (dmi_check_system(powernow_dmi_table) || acpi_force) { | |
613 | printk (KERN_INFO PFX "PSB/PST known to be broken. Trying ACPI instead\n"); | |
614 | result = powernow_acpi_init(); | |
615 | } else { | |
616 | result = powernow_decode_bios(fidvidstatus.bits.MFID, fidvidstatus.bits.SVID); | |
617 | if (result) { | |
618 | printk (KERN_INFO PFX "Trying ACPI perflib\n"); | |
619 | maximum_speed = 0; | |
620 | minimum_speed = -1; | |
621 | latency = 0; | |
622 | result = powernow_acpi_init(); | |
623 | if (result) { | |
624 | printk (KERN_INFO PFX "ACPI and legacy methods failed\n"); | |
dc2585eb | 625 | printk (KERN_INFO PFX "See http://www.codemonkey.org.uk/projects/cpufreq/powernow-k7.html\n"); |
1da177e4 LT |
626 | } |
627 | } else { | |
628 | /* SGTC use the bus clock as timer */ | |
629 | latency = fixup_sgtc(); | |
630 | printk(KERN_INFO PFX "SGTC: %d\n", latency); | |
631 | } | |
632 | } | |
633 | ||
634 | if (result) | |
635 | return result; | |
636 | ||
637 | printk (KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n", | |
638 | minimum_speed/1000, maximum_speed/1000); | |
639 | ||
1da177e4 LT |
640 | policy->cpuinfo.transition_latency = cpufreq_scale(2000000UL, fsb, latency); |
641 | ||
642 | policy->cur = powernow_get(0); | |
643 | ||
644 | cpufreq_frequency_table_get_attr(powernow_table, policy->cpu); | |
645 | ||
646 | return cpufreq_frequency_table_cpuinfo(policy, powernow_table); | |
647 | } | |
648 | ||
649 | static int powernow_cpu_exit (struct cpufreq_policy *policy) { | |
650 | cpufreq_frequency_table_put_attr(policy->cpu); | |
651 | ||
652 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
653 | if (acpi_processor_perf) { | |
654 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
655 | kfree(acpi_processor_perf); | |
656 | } | |
657 | #endif | |
658 | ||
4ae6673e | 659 | kfree(powernow_table); |
1da177e4 LT |
660 | return 0; |
661 | } | |
662 | ||
663 | static struct freq_attr* powernow_table_attr[] = { | |
664 | &cpufreq_freq_attr_scaling_available_freqs, | |
665 | NULL, | |
666 | }; | |
667 | ||
221dee28 | 668 | static struct cpufreq_driver powernow_driver = { |
1da177e4 LT |
669 | .verify = powernow_verify, |
670 | .target = powernow_target, | |
671 | .get = powernow_get, | |
672 | .init = powernow_cpu_init, | |
673 | .exit = powernow_cpu_exit, | |
674 | .name = "powernow-k7", | |
675 | .owner = THIS_MODULE, | |
676 | .attr = powernow_table_attr, | |
677 | }; | |
678 | ||
679 | static int __init powernow_init (void) | |
680 | { | |
681 | if (check_powernow()==0) | |
682 | return -ENODEV; | |
683 | return cpufreq_register_driver(&powernow_driver); | |
684 | } | |
685 | ||
686 | ||
687 | static void __exit powernow_exit (void) | |
688 | { | |
689 | cpufreq_unregister_driver(&powernow_driver); | |
690 | } | |
691 | ||
692 | module_param(acpi_force, int, 0444); | |
693 | MODULE_PARM_DESC(acpi_force, "Force ACPI to be used."); | |
694 | ||
695 | MODULE_AUTHOR ("Dave Jones <davej@codemonkey.org.uk>"); | |
696 | MODULE_DESCRIPTION ("Powernow driver for AMD K7 processors."); | |
697 | MODULE_LICENSE ("GPL"); | |
698 | ||
699 | late_initcall(powernow_init); | |
700 | module_exit(powernow_exit); | |
701 |