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17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/moduleparam.h>
20#include <linux/init.h>
21#include <linux/cpufreq.h>
22#include <linux/slab.h>
23#include <linux/string.h>
24#include <linux/dmi.h>
25#include <linux/timex.h>
26#include <linux/io.h>
27
28#include <asm/timer.h>
29#include <asm/msr.h>
30#include <asm/cpu_device_id.h>
31
32#ifdef CONFIG_X86_POWERNOW_K7_ACPI
33#include <linux/acpi.h>
34#include <acpi/processor.h>
35#endif
36
37#include "powernow-k7.h"
38
39#define PFX "powernow: "
40
41
42struct psb_s {
43 u8 signature[10];
44 u8 tableversion;
45 u8 flags;
46 u16 settlingtime;
47 u8 reserved1;
48 u8 numpst;
49};
50
51struct pst_s {
52 u32 cpuid;
53 u8 fsbspeed;
54 u8 maxfid;
55 u8 startvid;
56 u8 numpstates;
57};
58
59#ifdef CONFIG_X86_POWERNOW_K7_ACPI
60union powernow_acpi_control_t {
61 struct {
62 unsigned long fid:5,
63 vid:5,
64 sgtc:20,
65 res1:2;
66 } bits;
67 unsigned long val;
68};
69#endif
70
71
72static const int mobile_vid_table[32] = {
73 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650,
74 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0,
75 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100,
76 1075, 1050, 1025, 1000, 975, 950, 925, 0,
77};
78
79
80static const 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
88
89
90
91static int acpi_force;
92
93static struct cpufreq_frequency_table *powernow_table;
94
95static unsigned int can_scale_bus;
96static unsigned int can_scale_vid;
97static unsigned int minimum_speed = -1;
98static unsigned int maximum_speed;
99static unsigned int number_scales;
100static unsigned int fsb;
101static unsigned int latency;
102static char have_a0;
103
104static int check_fsb(unsigned int fsbspeed)
105{
106 int delta;
107 unsigned int f = fsb / 1000;
108
109 delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed;
110 return delta < 5;
111}
112
113static const struct x86_cpu_id powernow_k7_cpuids[] = {
114 { X86_VENDOR_AMD, 6, },
115 {}
116};
117MODULE_DEVICE_TABLE(x86cpu, powernow_k7_cpuids);
118
119static int check_powernow(void)
120{
121 struct cpuinfo_x86 *c = &cpu_data(0);
122 unsigned int maxei, eax, ebx, ecx, edx;
123
124 if (!x86_match_cpu(powernow_k7_cpuids))
125 return 0;
126
127
128 maxei = cpuid_eax(0x80000000);
129 if (maxei < 0x80000007) {
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, "
138 "enabling errata workarounds\n");
139 have_a0 = 1;
140 }
141
142 cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
143
144
145 if (!(edx & (1 << 1 | 1 << 2)))
146 return 0;
147
148 printk(KERN_INFO PFX "PowerNOW! Technology present. Can scale: ");
149
150 if (edx & 1 << 1) {
151 printk("frequency");
152 can_scale_bus = 1;
153 }
154
155 if ((edx & (1 << 1 | 1 << 2)) == 0x6)
156 printk(" and ");
157
158 if (edx & 1 << 2) {
159 printk("voltage");
160 can_scale_vid = 1;
161 }
162
163 printk(".\n");
164 return 1;
165}
166
167#ifdef CONFIG_X86_POWERNOW_K7_ACPI
168static void invalidate_entry(unsigned int entry)
169{
170 powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
171}
172#endif
173
174static int get_ranges(unsigned char *pst)
175{
176 unsigned int j;
177 unsigned int speed;
178 u8 fid, vid;
179
180 powernow_table = kzalloc((sizeof(*powernow_table) *
181 (number_scales + 1)), GFP_KERNEL);
182 if (!powernow_table)
183 return -ENOMEM;
184
185 for (j = 0 ; j < number_scales; j++) {
186 fid = *pst++;
187
188 powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10;
189 powernow_table[j].driver_data = fid;
190
191 speed = powernow_table[j].frequency;
192
193 if ((fid_codes[fid] % 10) == 5) {
194#ifdef CONFIG_X86_POWERNOW_K7_ACPI
195 if (have_a0 == 1)
196 invalidate_entry(j);
197#endif
198 }
199
200 if (speed < minimum_speed)
201 minimum_speed = speed;
202 if (speed > maximum_speed)
203 maximum_speed = speed;
204
205 vid = *pst++;
206 powernow_table[j].driver_data |= (vid << 8);
207
208 pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) "
209 "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10,
210 fid_codes[fid] % 10, speed/1000, vid,
211 mobile_vid_table[vid]/1000,
212 mobile_vid_table[vid]%1000);
213 }
214 powernow_table[number_scales].frequency = CPUFREQ_TABLE_END;
215 powernow_table[number_scales].driver_data = 0;
216
217 return 0;
218}
219
220
221static void change_FID(int fid)
222{
223 union msr_fidvidctl fidvidctl;
224
225 rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
226 if (fidvidctl.bits.FID != fid) {
227 fidvidctl.bits.SGTC = latency;
228 fidvidctl.bits.FID = fid;
229 fidvidctl.bits.VIDC = 0;
230 fidvidctl.bits.FIDC = 1;
231 wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
232 }
233}
234
235
236static void change_VID(int vid)
237{
238 union msr_fidvidctl fidvidctl;
239
240 rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
241 if (fidvidctl.bits.VID != vid) {
242 fidvidctl.bits.SGTC = latency;
243 fidvidctl.bits.VID = vid;
244 fidvidctl.bits.FIDC = 0;
245 fidvidctl.bits.VIDC = 1;
246 wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
247 }
248}
249
250
251static void change_speed(struct cpufreq_policy *policy, unsigned int index)
252{
253 u8 fid, vid;
254 struct cpufreq_freqs freqs;
255 union msr_fidvidstatus fidvidstatus;
256 int cfid;
257
258
259
260
261
262
263 fid = powernow_table[index].driver_data & 0xFF;
264 vid = (powernow_table[index].driver_data & 0xFF00) >> 8;
265
266 rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val);
267 cfid = fidvidstatus.bits.CFID;
268 freqs.old = fsb * fid_codes[cfid] / 10;
269
270 freqs.new = powernow_table[index].frequency;
271
272 cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
273
274
275
276 if (have_a0 == 1)
277 local_irq_disable();
278
279 if (freqs.old > freqs.new) {
280
281 change_FID(fid);
282 change_VID(vid);
283 } else {
284
285 change_VID(vid);
286 change_FID(fid);
287 }
288
289
290 if (have_a0 == 1)
291 local_irq_enable();
292
293 cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
294}
295
296
297#ifdef CONFIG_X86_POWERNOW_K7_ACPI
298
299static struct acpi_processor_performance *acpi_processor_perf;
300
301static int powernow_acpi_init(void)
302{
303 int i;
304 int retval = 0;
305 union powernow_acpi_control_t pc;
306
307 if (acpi_processor_perf != NULL && powernow_table != NULL) {
308 retval = -EINVAL;
309 goto err0;
310 }
311
312 acpi_processor_perf = kzalloc(sizeof(*acpi_processor_perf), GFP_KERNEL);
313 if (!acpi_processor_perf) {
314 retval = -ENOMEM;
315 goto err0;
316 }
317
318 if (!zalloc_cpumask_var(&acpi_processor_perf->shared_cpu_map,
319 GFP_KERNEL)) {
320 retval = -ENOMEM;
321 goto err05;
322 }
323
324 if (acpi_processor_register_performance(acpi_processor_perf, 0)) {
325 retval = -EIO;
326 goto err1;
327 }
328
329 if (acpi_processor_perf->control_register.space_id !=
330 ACPI_ADR_SPACE_FIXED_HARDWARE) {
331 retval = -ENODEV;
332 goto err2;
333 }
334
335 if (acpi_processor_perf->status_register.space_id !=
336 ACPI_ADR_SPACE_FIXED_HARDWARE) {
337 retval = -ENODEV;
338 goto err2;
339 }
340
341 number_scales = acpi_processor_perf->state_count;
342
343 if (number_scales < 2) {
344 retval = -ENODEV;
345 goto err2;
346 }
347
348 powernow_table = kzalloc((sizeof(*powernow_table) *
349 (number_scales + 1)), GFP_KERNEL);
350 if (!powernow_table) {
351 retval = -ENOMEM;
352 goto err2;
353 }
354
355 pc.val = (unsigned long) acpi_processor_perf->states[0].control;
356 for (i = 0; i < number_scales; i++) {
357 u8 fid, vid;
358 struct acpi_processor_px *state =
359 &acpi_processor_perf->states[i];
360 unsigned int speed, speed_mhz;
361
362 pc.val = (unsigned long) state->control;
363 pr_debug("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n",
364 i,
365 (u32) state->core_frequency,
366 (u32) state->power,
367 (u32) state->transition_latency,
368 (u32) state->control,
369 pc.bits.sgtc);
370
371 vid = pc.bits.vid;
372 fid = pc.bits.fid;
373
374 powernow_table[i].frequency = fsb * fid_codes[fid] / 10;
375 powernow_table[i].driver_data = fid;
376 powernow_table[i].driver_data |= (vid << 8);
377
378 speed = powernow_table[i].frequency;
379 speed_mhz = speed / 1000;
380
381
382
383
384
385
386
387
388
389 if (speed % 1000 > 0)
390 speed_mhz++;
391
392 if ((fid_codes[fid] % 10) == 5) {
393 if (have_a0 == 1)
394 invalidate_entry(i);
395 }
396
397 pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) "
398 "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10,
399 fid_codes[fid] % 10, speed_mhz, vid,
400 mobile_vid_table[vid]/1000,
401 mobile_vid_table[vid]%1000);
402
403 if (state->core_frequency != speed_mhz) {
404 state->core_frequency = speed_mhz;
405 pr_debug(" Corrected ACPI frequency to %d\n",
406 speed_mhz);
407 }
408
409 if (latency < pc.bits.sgtc)
410 latency = pc.bits.sgtc;
411
412 if (speed < minimum_speed)
413 minimum_speed = speed;
414 if (speed > maximum_speed)
415 maximum_speed = speed;
416 }
417
418 powernow_table[i].frequency = CPUFREQ_TABLE_END;
419 powernow_table[i].driver_data = 0;
420
421
422 acpi_processor_notify_smm(THIS_MODULE);
423
424 return 0;
425
426err2:
427 acpi_processor_unregister_performance(acpi_processor_perf, 0);
428err1:
429 free_cpumask_var(acpi_processor_perf->shared_cpu_map);
430err05:
431 kfree(acpi_processor_perf);
432err0:
433 printk(KERN_WARNING PFX "ACPI perflib can not be used on "
434 "this platform\n");
435 acpi_processor_perf = NULL;
436 return retval;
437}
438#else
439static int powernow_acpi_init(void)
440{
441 printk(KERN_INFO PFX "no support for ACPI processor found."
442 " Please recompile your kernel with ACPI processor\n");
443 return -EINVAL;
444}
445#endif
446
447static void print_pst_entry(struct pst_s *pst, unsigned int j)
448{
449 pr_debug("PST:%d (@%p)\n", j, pst);
450 pr_debug(" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n",
451 pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid);
452}
453
454static int powernow_decode_bios(int maxfid, int startvid)
455{
456 struct psb_s *psb;
457 struct pst_s *pst;
458 unsigned int i, j;
459 unsigned char *p;
460 unsigned int etuple;
461 unsigned int ret;
462
463 etuple = cpuid_eax(0x80000001);
464
465 for (i = 0xC0000; i < 0xffff0 ; i += 16) {
466
467 p = phys_to_virt(i);
468
469 if (memcmp(p, "AMDK7PNOW!", 10) == 0) {
470 pr_debug("Found PSB header at %p\n", p);
471 psb = (struct psb_s *) p;
472 pr_debug("Table version: 0x%x\n", psb->tableversion);
473 if (psb->tableversion != 0x12) {
474 printk(KERN_INFO PFX "Sorry, only v1.2 tables"
475 " supported right now\n");
476 return -ENODEV;
477 }
478
479 pr_debug("Flags: 0x%x\n", psb->flags);
480 if ((psb->flags & 1) == 0)
481 pr_debug("Mobile voltage regulator\n");
482 else
483 pr_debug("Desktop voltage regulator\n");
484
485 latency = psb->settlingtime;
486 if (latency < 100) {
487 printk(KERN_INFO PFX "BIOS set settling time "
488 "to %d microseconds. "
489 "Should be at least 100. "
490 "Correcting.\n", latency);
491 latency = 100;
492 }
493 pr_debug("Settling Time: %d microseconds.\n",
494 psb->settlingtime);
495 pr_debug("Has %d PST tables. (Only dumping ones "
496 "relevant to this CPU).\n",
497 psb->numpst);
498
499 p += sizeof(*psb);
500
501 pst = (struct pst_s *) p;
502
503 for (j = 0; j < psb->numpst; j++) {
504 pst = (struct pst_s *) p;
505 number_scales = pst->numpstates;
506
507 if ((etuple == pst->cpuid) &&
508 check_fsb(pst->fsbspeed) &&
509 (maxfid == pst->maxfid) &&
510 (startvid == pst->startvid)) {
511 print_pst_entry(pst, j);
512 p = (char *)pst + sizeof(*pst);
513 ret = get_ranges(p);
514 return ret;
515 } else {
516 unsigned int k;
517 p = (char *)pst + sizeof(*pst);
518 for (k = 0; k < number_scales; k++)
519 p += 2;
520 }
521 }
522 printk(KERN_INFO PFX "No PST tables match this cpuid "
523 "(0x%x)\n", etuple);
524 printk(KERN_INFO PFX "This is indicative of a broken "
525 "BIOS.\n");
526
527 return -EINVAL;
528 }
529 p++;
530 }
531
532 return -ENODEV;
533}
534
535
536static int powernow_target(struct cpufreq_policy *policy,
537 unsigned int target_freq,
538 unsigned int relation)
539{
540 unsigned int newstate;
541
542 if (cpufreq_frequency_table_target(policy, powernow_table, target_freq,
543 relation, &newstate))
544 return -EINVAL;
545
546 change_speed(policy, newstate);
547
548 return 0;
549}
550
551
552static int powernow_verify(struct cpufreq_policy *policy)
553{
554 return cpufreq_frequency_table_verify(policy, powernow_table);
555}
556
557
558
559
560
561
562
563
564
565static int fixup_sgtc(void)
566{
567 unsigned int sgtc;
568 unsigned int m;
569
570 m = fsb / 3333;
571 if ((m % 10) >= 5)
572 m += 5;
573
574 m /= 10;
575
576 sgtc = 100 * m * latency;
577 sgtc = sgtc / 3;
578 if (sgtc > 0xfffff) {
579 printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc);
580 sgtc = 0xfffff;
581 }
582 return sgtc;
583}
584
585static unsigned int powernow_get(unsigned int cpu)
586{
587 union msr_fidvidstatus fidvidstatus;
588 unsigned int cfid;
589
590 if (cpu)
591 return 0;
592 rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val);
593 cfid = fidvidstatus.bits.CFID;
594
595 return fsb * fid_codes[cfid] / 10;
596}
597
598
599static int acer_cpufreq_pst(const struct dmi_system_id *d)
600{
601 printk(KERN_WARNING PFX
602 "%s laptop with broken PST tables in BIOS detected.\n",
603 d->ident);
604 printk(KERN_WARNING PFX
605 "You need to downgrade to 3A21 (09/09/2002), or try a newer "
606 "BIOS than 3A71 (01/20/2003)\n");
607 printk(KERN_WARNING PFX
608 "cpufreq scaling has been disabled as a result of this.\n");
609 return 0;
610}
611
612
613
614
615
616
617static struct dmi_system_id powernow_dmi_table[] = {
618 {
619 .callback = acer_cpufreq_pst,
620 .ident = "Acer Aspire",
621 .matches = {
622 DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"),
623 DMI_MATCH(DMI_BIOS_VERSION, "3A71"),
624 },
625 },
626 { }
627};
628
629static int powernow_cpu_init(struct cpufreq_policy *policy)
630{
631 union msr_fidvidstatus fidvidstatus;
632 int result;
633
634 if (policy->cpu != 0)
635 return -ENODEV;
636
637 rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val);
638
639 recalibrate_cpu_khz();
640
641 fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID];
642 if (!fsb) {
643 printk(KERN_WARNING PFX "can not determine bus frequency\n");
644 return -EINVAL;
645 }
646 pr_debug("FSB: %3dMHz\n", fsb/1000);
647
648 if (dmi_check_system(powernow_dmi_table) || acpi_force) {
649 printk(KERN_INFO PFX "PSB/PST known to be broken. "
650 "Trying ACPI instead\n");
651 result = powernow_acpi_init();
652 } else {
653 result = powernow_decode_bios(fidvidstatus.bits.MFID,
654 fidvidstatus.bits.SVID);
655 if (result) {
656 printk(KERN_INFO PFX "Trying ACPI perflib\n");
657 maximum_speed = 0;
658 minimum_speed = -1;
659 latency = 0;
660 result = powernow_acpi_init();
661 if (result) {
662 printk(KERN_INFO PFX
663 "ACPI and legacy methods failed\n");
664 }
665 } else {
666
667 latency = fixup_sgtc();
668 printk(KERN_INFO PFX "SGTC: %d\n", latency);
669 }
670 }
671
672 if (result)
673 return result;
674
675 printk(KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n",
676 minimum_speed/1000, maximum_speed/1000);
677
678 policy->cpuinfo.transition_latency =
679 cpufreq_scale(2000000UL, fsb, latency);
680
681 policy->cur = powernow_get(0);
682
683 cpufreq_frequency_table_get_attr(powernow_table, policy->cpu);
684
685 return cpufreq_frequency_table_cpuinfo(policy, powernow_table);
686}
687
688static int powernow_cpu_exit(struct cpufreq_policy *policy)
689{
690 cpufreq_frequency_table_put_attr(policy->cpu);
691
692#ifdef CONFIG_X86_POWERNOW_K7_ACPI
693 if (acpi_processor_perf) {
694 acpi_processor_unregister_performance(acpi_processor_perf, 0);
695 free_cpumask_var(acpi_processor_perf->shared_cpu_map);
696 kfree(acpi_processor_perf);
697 }
698#endif
699
700 kfree(powernow_table);
701 return 0;
702}
703
704static struct freq_attr *powernow_table_attr[] = {
705 &cpufreq_freq_attr_scaling_available_freqs,
706 NULL,
707};
708
709static struct cpufreq_driver powernow_driver = {
710 .verify = powernow_verify,
711 .target = powernow_target,
712 .get = powernow_get,
713#ifdef CONFIG_X86_POWERNOW_K7_ACPI
714 .bios_limit = acpi_processor_get_bios_limit,
715#endif
716 .init = powernow_cpu_init,
717 .exit = powernow_cpu_exit,
718 .name = "powernow-k7",
719 .attr = powernow_table_attr,
720};
721
722static int __init powernow_init(void)
723{
724 if (check_powernow() == 0)
725 return -ENODEV;
726 return cpufreq_register_driver(&powernow_driver);
727}
728
729
730static void __exit powernow_exit(void)
731{
732 cpufreq_unregister_driver(&powernow_driver);
733}
734
735module_param(acpi_force, int, 0444);
736MODULE_PARM_DESC(acpi_force, "Force ACPI to be used.");
737
738MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
739MODULE_DESCRIPTION("Powernow driver for AMD K7 processors.");
740MODULE_LICENSE("GPL");
741
742late_initcall(powernow_init);
743module_exit(powernow_exit);
744
745
