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 | ||
15 | #include <linux/config.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/moduleparam.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/cpufreq.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/dmi.h> | |
24 | ||
25 | #include <asm/msr.h> | |
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. */ | |
71 | static int mobile_vid_table[32] = { | |
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. */ | |
80 | static int fid_codes[32] = { | |
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 | ||
173 | powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table) * (number_scales + 1)), GFP_KERNEL); | |
174 | if (!powernow_table) | |
175 | return -ENOMEM; | |
176 | memset(powernow_table, 0, (sizeof(struct cpufreq_frequency_table) * (number_scales + 1))); | |
177 | ||
178 | for (j=0 ; j < number_scales; j++) { | |
179 | fid = *pst++; | |
180 | ||
181 | powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10; | |
182 | powernow_table[j].index = fid; /* lower 8 bits */ | |
183 | ||
184 | speed = powernow_table[j].frequency; | |
185 | ||
186 | if ((fid_codes[fid] % 10)==5) { | |
187 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
188 | if (have_a0 == 1) | |
189 | powernow_table[j].frequency = CPUFREQ_ENTRY_INVALID; | |
190 | #endif | |
191 | } | |
192 | ||
193 | if (speed < minimum_speed) | |
194 | minimum_speed = speed; | |
195 | if (speed > maximum_speed) | |
196 | maximum_speed = speed; | |
197 | ||
198 | vid = *pst++; | |
199 | powernow_table[j].index |= (vid << 8); /* upper 8 bits */ | |
200 | ||
201 | dprintk (" FID: 0x%x (%d.%dx [%dMHz]) " | |
202 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, | |
203 | fid_codes[fid] % 10, speed/1000, vid, | |
204 | mobile_vid_table[vid]/1000, | |
205 | mobile_vid_table[vid]%1000); | |
206 | } | |
207 | powernow_table[number_scales].frequency = CPUFREQ_TABLE_END; | |
208 | powernow_table[number_scales].index = 0; | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | ||
214 | static void change_FID(int fid) | |
215 | { | |
216 | union msr_fidvidctl fidvidctl; | |
217 | ||
218 | rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val); | |
219 | if (fidvidctl.bits.FID != fid) { | |
220 | fidvidctl.bits.SGTC = latency; | |
221 | fidvidctl.bits.FID = fid; | |
222 | fidvidctl.bits.VIDC = 0; | |
223 | fidvidctl.bits.FIDC = 1; | |
224 | wrmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val); | |
225 | } | |
226 | } | |
227 | ||
228 | ||
229 | static void change_VID(int vid) | |
230 | { | |
231 | union msr_fidvidctl fidvidctl; | |
232 | ||
233 | rdmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val); | |
234 | if (fidvidctl.bits.VID != vid) { | |
235 | fidvidctl.bits.SGTC = latency; | |
236 | fidvidctl.bits.VID = vid; | |
237 | fidvidctl.bits.FIDC = 0; | |
238 | fidvidctl.bits.VIDC = 1; | |
239 | wrmsrl (MSR_K7_FID_VID_CTL, fidvidctl.val); | |
240 | } | |
241 | } | |
242 | ||
243 | ||
244 | static void change_speed (unsigned int index) | |
245 | { | |
246 | u8 fid, vid; | |
247 | struct cpufreq_freqs freqs; | |
248 | union msr_fidvidstatus fidvidstatus; | |
249 | int cfid; | |
250 | ||
251 | /* fid are the lower 8 bits of the index we stored into | |
252 | * the cpufreq frequency table in powernow_decode_bios, | |
253 | * vid are the upper 8 bits. | |
254 | */ | |
255 | ||
256 | fid = powernow_table[index].index & 0xFF; | |
257 | vid = (powernow_table[index].index & 0xFF00) >> 8; | |
258 | ||
259 | freqs.cpu = 0; | |
260 | ||
261 | rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val); | |
262 | cfid = fidvidstatus.bits.CFID; | |
263 | freqs.old = fsb * fid_codes[cfid] / 10; | |
264 | ||
265 | freqs.new = powernow_table[index].frequency; | |
266 | ||
267 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
268 | ||
269 | /* Now do the magic poking into the MSRs. */ | |
270 | ||
271 | if (have_a0 == 1) /* A0 errata 5 */ | |
272 | local_irq_disable(); | |
273 | ||
274 | if (freqs.old > freqs.new) { | |
275 | /* Going down, so change FID first */ | |
276 | change_FID(fid); | |
277 | change_VID(vid); | |
278 | } else { | |
279 | /* Going up, so change VID first */ | |
280 | change_VID(vid); | |
281 | change_FID(fid); | |
282 | } | |
283 | ||
284 | ||
285 | if (have_a0 == 1) | |
286 | local_irq_enable(); | |
287 | ||
288 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
289 | } | |
290 | ||
291 | ||
292 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
293 | ||
294 | static struct acpi_processor_performance *acpi_processor_perf; | |
295 | ||
296 | static int powernow_acpi_init(void) | |
297 | { | |
298 | int i; | |
299 | int retval = 0; | |
300 | union powernow_acpi_control_t pc; | |
301 | ||
302 | if (acpi_processor_perf != NULL && powernow_table != NULL) { | |
303 | retval = -EINVAL; | |
304 | goto err0; | |
305 | } | |
306 | ||
307 | acpi_processor_perf = kmalloc(sizeof(struct acpi_processor_performance), | |
308 | GFP_KERNEL); | |
309 | ||
310 | if (!acpi_processor_perf) { | |
311 | retval = -ENOMEM; | |
312 | goto err0; | |
313 | } | |
314 | ||
315 | memset(acpi_processor_perf, 0, sizeof(struct acpi_processor_performance)); | |
316 | ||
317 | if (acpi_processor_register_performance(acpi_processor_perf, 0)) { | |
318 | retval = -EIO; | |
319 | goto err1; | |
320 | } | |
321 | ||
322 | if (acpi_processor_perf->control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
323 | retval = -ENODEV; | |
324 | goto err2; | |
325 | } | |
326 | ||
327 | if (acpi_processor_perf->status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
328 | retval = -ENODEV; | |
329 | goto err2; | |
330 | } | |
331 | ||
332 | number_scales = acpi_processor_perf->state_count; | |
333 | ||
334 | if (number_scales < 2) { | |
335 | retval = -ENODEV; | |
336 | goto err2; | |
337 | } | |
338 | ||
339 | powernow_table = kmalloc((number_scales + 1) * (sizeof(struct cpufreq_frequency_table)), GFP_KERNEL); | |
340 | if (!powernow_table) { | |
341 | retval = -ENOMEM; | |
342 | goto err2; | |
343 | } | |
344 | ||
345 | memset(powernow_table, 0, ((number_scales + 1) * sizeof(struct cpufreq_frequency_table))); | |
346 | ||
347 | pc.val = (unsigned long) acpi_processor_perf->states[0].control; | |
348 | for (i = 0; i < number_scales; i++) { | |
349 | u8 fid, vid; | |
350 | unsigned int speed; | |
351 | ||
352 | pc.val = (unsigned long) acpi_processor_perf->states[i].control; | |
353 | dprintk ("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n", | |
354 | i, | |
355 | (u32) acpi_processor_perf->states[i].core_frequency, | |
356 | (u32) acpi_processor_perf->states[i].power, | |
357 | (u32) acpi_processor_perf->states[i].transition_latency, | |
358 | (u32) acpi_processor_perf->states[i].control, | |
359 | pc.bits.sgtc); | |
360 | ||
361 | vid = pc.bits.vid; | |
362 | fid = pc.bits.fid; | |
363 | ||
364 | powernow_table[i].frequency = fsb * fid_codes[fid] / 10; | |
365 | powernow_table[i].index = fid; /* lower 8 bits */ | |
366 | powernow_table[i].index |= (vid << 8); /* upper 8 bits */ | |
367 | ||
368 | speed = powernow_table[i].frequency; | |
369 | ||
370 | if ((fid_codes[fid] % 10)==5) { | |
371 | if (have_a0 == 1) | |
372 | powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID; | |
373 | } | |
374 | ||
375 | dprintk (" FID: 0x%x (%d.%dx [%dMHz]) " | |
376 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, | |
377 | fid_codes[fid] % 10, speed/1000, vid, | |
378 | mobile_vid_table[vid]/1000, | |
379 | mobile_vid_table[vid]%1000); | |
380 | ||
381 | if (latency < pc.bits.sgtc) | |
382 | latency = pc.bits.sgtc; | |
383 | ||
384 | if (speed < minimum_speed) | |
385 | minimum_speed = speed; | |
386 | if (speed > maximum_speed) | |
387 | maximum_speed = speed; | |
388 | } | |
389 | ||
390 | powernow_table[i].frequency = CPUFREQ_TABLE_END; | |
391 | powernow_table[i].index = 0; | |
392 | ||
393 | /* notify BIOS that we exist */ | |
394 | acpi_processor_notify_smm(THIS_MODULE); | |
395 | ||
396 | return 0; | |
397 | ||
398 | err2: | |
399 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
400 | err1: | |
401 | kfree(acpi_processor_perf); | |
402 | err0: | |
403 | printk(KERN_WARNING PFX "ACPI perflib can not be used in this platform\n"); | |
404 | acpi_processor_perf = NULL; | |
405 | return retval; | |
406 | } | |
407 | #else | |
408 | static int powernow_acpi_init(void) | |
409 | { | |
410 | printk(KERN_INFO PFX "no support for ACPI processor found." | |
411 | " Please recompile your kernel with ACPI processor\n"); | |
412 | return -EINVAL; | |
413 | } | |
414 | #endif | |
415 | ||
416 | static int powernow_decode_bios (int maxfid, int startvid) | |
417 | { | |
418 | struct psb_s *psb; | |
419 | struct pst_s *pst; | |
420 | unsigned int i, j; | |
421 | unsigned char *p; | |
422 | unsigned int etuple; | |
423 | unsigned int ret; | |
424 | ||
425 | etuple = cpuid_eax(0x80000001); | |
426 | ||
427 | for (i=0xC0000; i < 0xffff0 ; i+=16) { | |
428 | ||
429 | p = phys_to_virt(i); | |
430 | ||
431 | if (memcmp(p, "AMDK7PNOW!", 10) == 0){ | |
432 | dprintk ("Found PSB header at %p\n", p); | |
433 | psb = (struct psb_s *) p; | |
434 | dprintk ("Table version: 0x%x\n", psb->tableversion); | |
435 | if (psb->tableversion != 0x12) { | |
436 | printk (KERN_INFO PFX "Sorry, only v1.2 tables supported right now\n"); | |
437 | return -ENODEV; | |
438 | } | |
439 | ||
440 | dprintk ("Flags: 0x%x\n", psb->flags); | |
441 | if ((psb->flags & 1)==0) { | |
442 | dprintk ("Mobile voltage regulator\n"); | |
443 | } else { | |
444 | dprintk ("Desktop voltage regulator\n"); | |
445 | } | |
446 | ||
447 | latency = psb->settlingtime; | |
448 | if (latency < 100) { | |
449 | printk (KERN_INFO PFX "BIOS set settling time to %d microseconds." | |
450 | "Should be at least 100. Correcting.\n", latency); | |
451 | latency = 100; | |
452 | } | |
453 | dprintk ("Settling Time: %d microseconds.\n", psb->settlingtime); | |
454 | dprintk ("Has %d PST tables. (Only dumping ones relevant to this CPU).\n", psb->numpst); | |
455 | ||
456 | p += sizeof (struct psb_s); | |
457 | ||
458 | pst = (struct pst_s *) p; | |
459 | ||
460 | for (i = 0 ; i <psb->numpst; i++) { | |
461 | pst = (struct pst_s *) p; | |
462 | number_scales = pst->numpstates; | |
463 | ||
464 | if ((etuple == pst->cpuid) && check_fsb(pst->fsbspeed) && | |
465 | (maxfid==pst->maxfid) && (startvid==pst->startvid)) | |
466 | { | |
467 | dprintk ("PST:%d (@%p)\n", i, pst); | |
468 | dprintk (" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n", | |
469 | pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid); | |
470 | ||
471 | ret = get_ranges ((char *) pst + sizeof (struct pst_s)); | |
472 | return ret; | |
473 | ||
474 | } else { | |
475 | p = (char *) pst + sizeof (struct pst_s); | |
476 | for (j=0 ; j < number_scales; j++) | |
477 | p+=2; | |
478 | } | |
479 | } | |
480 | printk (KERN_INFO PFX "No PST tables match this cpuid (0x%x)\n", etuple); | |
481 | printk (KERN_INFO PFX "This is indicative of a broken BIOS.\n"); | |
482 | ||
483 | return -EINVAL; | |
484 | } | |
485 | p++; | |
486 | } | |
487 | ||
488 | return -ENODEV; | |
489 | } | |
490 | ||
491 | ||
492 | static int powernow_target (struct cpufreq_policy *policy, | |
493 | unsigned int target_freq, | |
494 | unsigned int relation) | |
495 | { | |
496 | unsigned int newstate; | |
497 | ||
498 | if (cpufreq_frequency_table_target(policy, powernow_table, target_freq, relation, &newstate)) | |
499 | return -EINVAL; | |
500 | ||
501 | change_speed(newstate); | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | ||
507 | static int powernow_verify (struct cpufreq_policy *policy) | |
508 | { | |
509 | return cpufreq_frequency_table_verify(policy, powernow_table); | |
510 | } | |
511 | ||
512 | /* | |
513 | * We use the fact that the bus frequency is somehow | |
514 | * a multiple of 100000/3 khz, then we compute sgtc according | |
515 | * to this multiple. | |
516 | * That way, we match more how AMD thinks all of that work. | |
517 | * We will then get the same kind of behaviour already tested under | |
518 | * the "well-known" other OS. | |
519 | */ | |
520 | static int __init fixup_sgtc(void) | |
521 | { | |
522 | unsigned int sgtc; | |
523 | unsigned int m; | |
524 | ||
525 | m = fsb / 3333; | |
526 | if ((m % 10) >= 5) | |
527 | m += 5; | |
528 | ||
529 | m /= 10; | |
530 | ||
531 | sgtc = 100 * m * latency; | |
532 | sgtc = sgtc / 3; | |
533 | if (sgtc > 0xfffff) { | |
534 | printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc); | |
535 | sgtc = 0xfffff; | |
536 | } | |
537 | return sgtc; | |
538 | } | |
539 | ||
540 | static unsigned int powernow_get(unsigned int cpu) | |
541 | { | |
542 | union msr_fidvidstatus fidvidstatus; | |
543 | unsigned int cfid; | |
544 | ||
545 | if (cpu) | |
546 | return 0; | |
547 | rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val); | |
548 | cfid = fidvidstatus.bits.CFID; | |
549 | ||
550 | return (fsb * fid_codes[cfid] / 10); | |
551 | } | |
552 | ||
553 | ||
554 | static int __init acer_cpufreq_pst(struct dmi_system_id *d) | |
555 | { | |
556 | printk(KERN_WARNING "%s laptop with broken PST tables in BIOS detected.\n", d->ident); | |
557 | printk(KERN_WARNING "You need to downgrade to 3A21 (09/09/2002), or try a newer BIOS than 3A71 (01/20/2003)\n"); | |
558 | printk(KERN_WARNING "cpufreq scaling has been disabled as a result of this.\n"); | |
559 | return 0; | |
560 | } | |
561 | ||
562 | /* | |
563 | * Some Athlon laptops have really fucked PST tables. | |
564 | * A BIOS update is all that can save them. | |
565 | * Mention this, and disable cpufreq. | |
566 | */ | |
567 | static struct dmi_system_id __initdata powernow_dmi_table[] = { | |
568 | { | |
569 | .callback = acer_cpufreq_pst, | |
570 | .ident = "Acer Aspire", | |
571 | .matches = { | |
572 | DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"), | |
573 | DMI_MATCH(DMI_BIOS_VERSION, "3A71"), | |
574 | }, | |
575 | }, | |
576 | { } | |
577 | }; | |
578 | ||
579 | static int __init powernow_cpu_init (struct cpufreq_policy *policy) | |
580 | { | |
581 | union msr_fidvidstatus fidvidstatus; | |
582 | int result; | |
583 | ||
584 | if (policy->cpu != 0) | |
585 | return -ENODEV; | |
586 | ||
587 | rdmsrl (MSR_K7_FID_VID_STATUS, fidvidstatus.val); | |
588 | ||
589 | /* A K7 with powernow technology is set to max frequency by BIOS */ | |
590 | fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.MFID]; | |
591 | if (!fsb) { | |
592 | printk(KERN_WARNING PFX "can not determine bus frequency\n"); | |
593 | return -EINVAL; | |
594 | } | |
7eb53d88 | 595 | dprintk("FSB: %3dMHz\n", fsb/1000); |
1da177e4 LT |
596 | |
597 | if (dmi_check_system(powernow_dmi_table) || acpi_force) { | |
598 | printk (KERN_INFO PFX "PSB/PST known to be broken. Trying ACPI instead\n"); | |
599 | result = powernow_acpi_init(); | |
600 | } else { | |
601 | result = powernow_decode_bios(fidvidstatus.bits.MFID, fidvidstatus.bits.SVID); | |
602 | if (result) { | |
603 | printk (KERN_INFO PFX "Trying ACPI perflib\n"); | |
604 | maximum_speed = 0; | |
605 | minimum_speed = -1; | |
606 | latency = 0; | |
607 | result = powernow_acpi_init(); | |
608 | if (result) { | |
609 | printk (KERN_INFO PFX "ACPI and legacy methods failed\n"); | |
610 | printk (KERN_INFO PFX "See http://www.codemonkey.org.uk/projects/cpufreq/powernow-k7.shtml\n"); | |
611 | } | |
612 | } else { | |
613 | /* SGTC use the bus clock as timer */ | |
614 | latency = fixup_sgtc(); | |
615 | printk(KERN_INFO PFX "SGTC: %d\n", latency); | |
616 | } | |
617 | } | |
618 | ||
619 | if (result) | |
620 | return result; | |
621 | ||
622 | printk (KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n", | |
623 | minimum_speed/1000, maximum_speed/1000); | |
624 | ||
625 | policy->governor = CPUFREQ_DEFAULT_GOVERNOR; | |
626 | ||
627 | policy->cpuinfo.transition_latency = cpufreq_scale(2000000UL, fsb, latency); | |
628 | ||
629 | policy->cur = powernow_get(0); | |
630 | ||
631 | cpufreq_frequency_table_get_attr(powernow_table, policy->cpu); | |
632 | ||
633 | return cpufreq_frequency_table_cpuinfo(policy, powernow_table); | |
634 | } | |
635 | ||
636 | static int powernow_cpu_exit (struct cpufreq_policy *policy) { | |
637 | cpufreq_frequency_table_put_attr(policy->cpu); | |
638 | ||
639 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
640 | if (acpi_processor_perf) { | |
641 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
642 | kfree(acpi_processor_perf); | |
643 | } | |
644 | #endif | |
645 | ||
646 | if (powernow_table) | |
647 | kfree(powernow_table); | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
652 | static struct freq_attr* powernow_table_attr[] = { | |
653 | &cpufreq_freq_attr_scaling_available_freqs, | |
654 | NULL, | |
655 | }; | |
656 | ||
657 | static struct cpufreq_driver powernow_driver = { | |
658 | .verify = powernow_verify, | |
659 | .target = powernow_target, | |
660 | .get = powernow_get, | |
661 | .init = powernow_cpu_init, | |
662 | .exit = powernow_cpu_exit, | |
663 | .name = "powernow-k7", | |
664 | .owner = THIS_MODULE, | |
665 | .attr = powernow_table_attr, | |
666 | }; | |
667 | ||
668 | static int __init powernow_init (void) | |
669 | { | |
670 | if (check_powernow()==0) | |
671 | return -ENODEV; | |
672 | return cpufreq_register_driver(&powernow_driver); | |
673 | } | |
674 | ||
675 | ||
676 | static void __exit powernow_exit (void) | |
677 | { | |
678 | cpufreq_unregister_driver(&powernow_driver); | |
679 | } | |
680 | ||
681 | module_param(acpi_force, int, 0444); | |
682 | MODULE_PARM_DESC(acpi_force, "Force ACPI to be used."); | |
683 | ||
684 | MODULE_AUTHOR ("Dave Jones <davej@codemonkey.org.uk>"); | |
685 | MODULE_DESCRIPTION ("Powernow driver for AMD K7 processors."); | |
686 | MODULE_LICENSE ("GPL"); | |
687 | ||
688 | late_initcall(powernow_init); | |
689 | module_exit(powernow_exit); | |
690 |