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30#include <linux/kernel.h>
31#include <linux/smp.h>
32#include <linux/module.h>
33#include <linux/init.h>
34#include <linux/cpufreq.h>
35#include <linux/slab.h>
36#include <linux/string.h>
37#include <linux/cpumask.h>
38#include <linux/io.h>
39#include <linux/delay.h>
40
41#include <asm/msr.h>
42#include <asm/cpu_device_id.h>
43
44#include <linux/acpi.h>
45#include <linux/mutex.h>
46#include <acpi/processor.h>
47
48#define PFX "powernow-k8: "
49#define VERSION "version 2.20.00"
50#include "powernow-k8.h"
51
52
53static DEFINE_MUTEX(fidvid_mutex);
54
55static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data);
56
57static struct cpufreq_driver cpufreq_amd64_driver;
58
59#ifndef CONFIG_SMP
60static inline const struct cpumask *cpu_core_mask(int cpu)
61{
62 return cpumask_of(0);
63}
64#endif
65
66
67static u32 find_freq_from_fid(u32 fid)
68{
69 return 800 + (fid * 100);
70}
71
72
73static u32 find_khz_freq_from_fid(u32 fid)
74{
75 return 1000 * find_freq_from_fid(fid);
76}
77
78
79
80
81
82
83
84static u32 convert_fid_to_vco_fid(u32 fid)
85{
86 if (fid < HI_FID_TABLE_BOTTOM)
87 return 8 + (2 * fid);
88 else
89 return fid;
90}
91
92
93
94
95
96static int pending_bit_stuck(void)
97{
98 u32 lo, hi;
99
100 rdmsr(MSR_FIDVID_STATUS, lo, hi);
101 return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
102}
103
104
105
106
107
108static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
109{
110 u32 lo, hi;
111 u32 i = 0;
112
113 do {
114 if (i++ > 10000) {
115 pr_debug("detected change pending stuck\n");
116 return 1;
117 }
118 rdmsr(MSR_FIDVID_STATUS, lo, hi);
119 } while (lo & MSR_S_LO_CHANGE_PENDING);
120
121 data->currvid = hi & MSR_S_HI_CURRENT_VID;
122 data->currfid = lo & MSR_S_LO_CURRENT_FID;
123
124 return 0;
125}
126
127
128static void count_off_irt(struct powernow_k8_data *data)
129{
130 udelay((1 << data->irt) * 10);
131 return;
132}
133
134
135static void count_off_vst(struct powernow_k8_data *data)
136{
137 udelay(data->vstable * VST_UNITS_20US);
138 return;
139}
140
141
142static void fidvid_msr_init(void)
143{
144 u32 lo, hi;
145 u8 fid, vid;
146
147 rdmsr(MSR_FIDVID_STATUS, lo, hi);
148 vid = hi & MSR_S_HI_CURRENT_VID;
149 fid = lo & MSR_S_LO_CURRENT_FID;
150 lo = fid | (vid << MSR_C_LO_VID_SHIFT);
151 hi = MSR_C_HI_STP_GNT_BENIGN;
152 pr_debug("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
153 wrmsr(MSR_FIDVID_CTL, lo, hi);
154}
155
156
157static int write_new_fid(struct powernow_k8_data *data, u32 fid)
158{
159 u32 lo;
160 u32 savevid = data->currvid;
161 u32 i = 0;
162
163 if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
164 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
165 return 1;
166 }
167
168 lo = fid;
169 lo |= (data->currvid << MSR_C_LO_VID_SHIFT);
170 lo |= MSR_C_LO_INIT_FID_VID;
171
172 pr_debug("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
173 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
174
175 do {
176 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
177 if (i++ > 100) {
178 printk(KERN_ERR PFX
179 "Hardware error - pending bit very stuck - "
180 "no further pstate changes possible\n");
181 return 1;
182 }
183 } while (query_current_values_with_pending_wait(data));
184
185 count_off_irt(data);
186
187 if (savevid != data->currvid) {
188 printk(KERN_ERR PFX
189 "vid change on fid trans, old 0x%x, new 0x%x\n",
190 savevid, data->currvid);
191 return 1;
192 }
193
194 if (fid != data->currfid) {
195 printk(KERN_ERR PFX
196 "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
197 data->currfid);
198 return 1;
199 }
200
201 return 0;
202}
203
204
205static int write_new_vid(struct powernow_k8_data *data, u32 vid)
206{
207 u32 lo;
208 u32 savefid = data->currfid;
209 int i = 0;
210
211 if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
212 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
213 return 1;
214 }
215
216 lo = data->currfid;
217 lo |= (vid << MSR_C_LO_VID_SHIFT);
218 lo |= MSR_C_LO_INIT_FID_VID;
219
220 pr_debug("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
221 vid, lo, STOP_GRANT_5NS);
222
223 do {
224 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
225 if (i++ > 100) {
226 printk(KERN_ERR PFX "internal error - pending bit "
227 "very stuck - no further pstate "
228 "changes possible\n");
229 return 1;
230 }
231 } while (query_current_values_with_pending_wait(data));
232
233 if (savefid != data->currfid) {
234 printk(KERN_ERR PFX "fid changed on vid trans, old "
235 "0x%x new 0x%x\n",
236 savefid, data->currfid);
237 return 1;
238 }
239
240 if (vid != data->currvid) {
241 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, "
242 "curr 0x%x\n",
243 vid, data->currvid);
244 return 1;
245 }
246
247 return 0;
248}
249
250
251
252
253
254
255static int decrease_vid_code_by_step(struct powernow_k8_data *data,
256 u32 reqvid, u32 step)
257{
258 if ((data->currvid - reqvid) > step)
259 reqvid = data->currvid - step;
260
261 if (write_new_vid(data, reqvid))
262 return 1;
263
264 count_off_vst(data);
265
266 return 0;
267}
268
269
270static int transition_fid_vid(struct powernow_k8_data *data,
271 u32 reqfid, u32 reqvid)
272{
273 if (core_voltage_pre_transition(data, reqvid, reqfid))
274 return 1;
275
276 if (core_frequency_transition(data, reqfid))
277 return 1;
278
279 if (core_voltage_post_transition(data, reqvid))
280 return 1;
281
282 if (query_current_values_with_pending_wait(data))
283 return 1;
284
285 if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
286 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, "
287 "curr 0x%x 0x%x\n",
288 smp_processor_id(),
289 reqfid, reqvid, data->currfid, data->currvid);
290 return 1;
291 }
292
293 pr_debug("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
294 smp_processor_id(), data->currfid, data->currvid);
295
296 return 0;
297}
298
299
300static int core_voltage_pre_transition(struct powernow_k8_data *data,
301 u32 reqvid, u32 reqfid)
302{
303 u32 rvosteps = data->rvo;
304 u32 savefid = data->currfid;
305 u32 maxvid, lo, rvomult = 1;
306
307 pr_debug("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, "
308 "reqvid 0x%x, rvo 0x%x\n",
309 smp_processor_id(),
310 data->currfid, data->currvid, reqvid, data->rvo);
311
312 if ((savefid < LO_FID_TABLE_TOP) && (reqfid < LO_FID_TABLE_TOP))
313 rvomult = 2;
314 rvosteps *= rvomult;
315 rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
316 maxvid = 0x1f & (maxvid >> 16);
317 pr_debug("ph1 maxvid=0x%x\n", maxvid);
318 if (reqvid < maxvid)
319 reqvid = maxvid;
320
321 while (data->currvid > reqvid) {
322 pr_debug("ph1: curr 0x%x, req vid 0x%x\n",
323 data->currvid, reqvid);
324 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
325 return 1;
326 }
327
328 while ((rvosteps > 0) &&
329 ((rvomult * data->rvo + data->currvid) > reqvid)) {
330 if (data->currvid == maxvid) {
331 rvosteps = 0;
332 } else {
333 pr_debug("ph1: changing vid for rvo, req 0x%x\n",
334 data->currvid - 1);
335 if (decrease_vid_code_by_step(data, data->currvid-1, 1))
336 return 1;
337 rvosteps--;
338 }
339 }
340
341 if (query_current_values_with_pending_wait(data))
342 return 1;
343
344 if (savefid != data->currfid) {
345 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n",
346 data->currfid);
347 return 1;
348 }
349
350 pr_debug("ph1 complete, currfid 0x%x, currvid 0x%x\n",
351 data->currfid, data->currvid);
352
353 return 0;
354}
355
356
357static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
358{
359 u32 vcoreqfid, vcocurrfid, vcofiddiff;
360 u32 fid_interval, savevid = data->currvid;
361
362 if (data->currfid == reqfid) {
363 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n",
364 data->currfid);
365 return 0;
366 }
367
368 pr_debug("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, "
369 "reqfid 0x%x\n",
370 smp_processor_id(),
371 data->currfid, data->currvid, reqfid);
372
373 vcoreqfid = convert_fid_to_vco_fid(reqfid);
374 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
375 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
376 : vcoreqfid - vcocurrfid;
377
378 if ((reqfid <= LO_FID_TABLE_TOP) && (data->currfid <= LO_FID_TABLE_TOP))
379 vcofiddiff = 0;
380
381 while (vcofiddiff > 2) {
382 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
383
384 if (reqfid > data->currfid) {
385 if (data->currfid > LO_FID_TABLE_TOP) {
386 if (write_new_fid(data,
387 data->currfid + fid_interval))
388 return 1;
389 } else {
390 if (write_new_fid
391 (data,
392 2 + convert_fid_to_vco_fid(data->currfid)))
393 return 1;
394 }
395 } else {
396 if (write_new_fid(data, data->currfid - fid_interval))
397 return 1;
398 }
399
400 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
401 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
402 : vcoreqfid - vcocurrfid;
403 }
404
405 if (write_new_fid(data, reqfid))
406 return 1;
407
408 if (query_current_values_with_pending_wait(data))
409 return 1;
410
411 if (data->currfid != reqfid) {
412 printk(KERN_ERR PFX
413 "ph2: mismatch, failed fid transition, "
414 "curr 0x%x, req 0x%x\n",
415 data->currfid, reqfid);
416 return 1;
417 }
418
419 if (savevid != data->currvid) {
420 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
421 savevid, data->currvid);
422 return 1;
423 }
424
425 pr_debug("ph2 complete, currfid 0x%x, currvid 0x%x\n",
426 data->currfid, data->currvid);
427
428 return 0;
429}
430
431
432static int core_voltage_post_transition(struct powernow_k8_data *data,
433 u32 reqvid)
434{
435 u32 savefid = data->currfid;
436 u32 savereqvid = reqvid;
437
438 pr_debug("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
439 smp_processor_id(),
440 data->currfid, data->currvid);
441
442 if (reqvid != data->currvid) {
443 if (write_new_vid(data, reqvid))
444 return 1;
445
446 if (savefid != data->currfid) {
447 printk(KERN_ERR PFX
448 "ph3: bad fid change, save 0x%x, curr 0x%x\n",
449 savefid, data->currfid);
450 return 1;
451 }
452
453 if (data->currvid != reqvid) {
454 printk(KERN_ERR PFX
455 "ph3: failed vid transition\n, "
456 "req 0x%x, curr 0x%x",
457 reqvid, data->currvid);
458 return 1;
459 }
460 }
461
462 if (query_current_values_with_pending_wait(data))
463 return 1;
464
465 if (savereqvid != data->currvid) {
466 pr_debug("ph3 failed, currvid 0x%x\n", data->currvid);
467 return 1;
468 }
469
470 if (savefid != data->currfid) {
471 pr_debug("ph3 failed, currfid changed 0x%x\n",
472 data->currfid);
473 return 1;
474 }
475
476 pr_debug("ph3 complete, currfid 0x%x, currvid 0x%x\n",
477 data->currfid, data->currvid);
478
479 return 0;
480}
481
482static const struct x86_cpu_id powernow_k8_ids[] = {
483
484 { X86_VENDOR_AMD, 0xf },
485 {}
486};
487MODULE_DEVICE_TABLE(x86cpu, powernow_k8_ids);
488
489static void check_supported_cpu(void *_rc)
490{
491 u32 eax, ebx, ecx, edx;
492 int *rc = _rc;
493
494 *rc = -ENODEV;
495
496 eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
497
498 if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
499 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
500 ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
501 printk(KERN_INFO PFX
502 "Processor cpuid %x not supported\n", eax);
503 return;
504 }
505
506 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
507 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
508 printk(KERN_INFO PFX
509 "No frequency change capabilities detected\n");
510 return;
511 }
512
513 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
514 if ((edx & P_STATE_TRANSITION_CAPABLE)
515 != P_STATE_TRANSITION_CAPABLE) {
516 printk(KERN_INFO PFX
517 "Power state transitions not supported\n");
518 return;
519 }
520 *rc = 0;
521 }
522}
523
524static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst,
525 u8 maxvid)
526{
527 unsigned int j;
528 u8 lastfid = 0xff;
529
530 for (j = 0; j < data->numps; j++) {
531 if (pst[j].vid > LEAST_VID) {
532 printk(KERN_ERR FW_BUG PFX "vid %d invalid : 0x%x\n",
533 j, pst[j].vid);
534 return -EINVAL;
535 }
536 if (pst[j].vid < data->rvo) {
537
538 printk(KERN_ERR FW_BUG PFX "0 vid exceeded with pstate"
539 " %d\n", j);
540 return -ENODEV;
541 }
542 if (pst[j].vid < maxvid + data->rvo) {
543
544 printk(KERN_ERR FW_BUG PFX "maxvid exceeded with pstate"
545 " %d\n", j);
546 return -ENODEV;
547 }
548 if (pst[j].fid > MAX_FID) {
549 printk(KERN_ERR FW_BUG PFX "maxfid exceeded with pstate"
550 " %d\n", j);
551 return -ENODEV;
552 }
553 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
554
555 printk(KERN_ERR FW_BUG PFX "two low fids - %d : "
556 "0x%x\n", j, pst[j].fid);
557 return -EINVAL;
558 }
559 if (pst[j].fid < lastfid)
560 lastfid = pst[j].fid;
561 }
562 if (lastfid & 1) {
563 printk(KERN_ERR FW_BUG PFX "lastfid invalid\n");
564 return -EINVAL;
565 }
566 if (lastfid > LO_FID_TABLE_TOP)
567 printk(KERN_INFO FW_BUG PFX
568 "first fid not from lo freq table\n");
569
570 return 0;
571}
572
573static void invalidate_entry(struct cpufreq_frequency_table *powernow_table,
574 unsigned int entry)
575{
576 powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
577}
578
579static void print_basics(struct powernow_k8_data *data)
580{
581 int j;
582 for (j = 0; j < data->numps; j++) {
583 if (data->powernow_table[j].frequency !=
584 CPUFREQ_ENTRY_INVALID) {
585 printk(KERN_INFO PFX
586 "fid 0x%x (%d MHz), vid 0x%x\n",
587 data->powernow_table[j].index & 0xff,
588 data->powernow_table[j].frequency/1000,
589 data->powernow_table[j].index >> 8);
590 }
591 }
592 if (data->batps)
593 printk(KERN_INFO PFX "Only %d pstates on battery\n",
594 data->batps);
595}
596
597static int fill_powernow_table(struct powernow_k8_data *data,
598 struct pst_s *pst, u8 maxvid)
599{
600 struct cpufreq_frequency_table *powernow_table;
601 unsigned int j;
602
603 if (data->batps) {
604
605 printk(KERN_WARNING PFX
606 "Only %d pstates usable (use ACPI driver for full "
607 "range\n", data->batps);
608 data->numps = data->batps;
609 }
610
611 for (j = 1; j < data->numps; j++) {
612 if (pst[j-1].fid >= pst[j].fid) {
613 printk(KERN_ERR PFX "PST out of sequence\n");
614 return -EINVAL;
615 }
616 }
617
618 if (data->numps < 2) {
619 printk(KERN_ERR PFX "no p states to transition\n");
620 return -ENODEV;
621 }
622
623 if (check_pst_table(data, pst, maxvid))
624 return -EINVAL;
625
626 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
627 * (data->numps + 1)), GFP_KERNEL);
628 if (!powernow_table) {
629 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
630 return -ENOMEM;
631 }
632
633 for (j = 0; j < data->numps; j++) {
634 int freq;
635 powernow_table[j].index = pst[j].fid;
636 powernow_table[j].index |= (pst[j].vid << 8);
637 freq = find_khz_freq_from_fid(pst[j].fid);
638 powernow_table[j].frequency = freq;
639 }
640 powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
641 powernow_table[data->numps].index = 0;
642
643 if (query_current_values_with_pending_wait(data)) {
644 kfree(powernow_table);
645 return -EIO;
646 }
647
648 pr_debug("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
649 data->powernow_table = powernow_table;
650 if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
651 print_basics(data);
652
653 for (j = 0; j < data->numps; j++)
654 if ((pst[j].fid == data->currfid) &&
655 (pst[j].vid == data->currvid))
656 return 0;
657
658 pr_debug("currfid/vid do not match PST, ignoring\n");
659 return 0;
660}
661
662
663static int find_psb_table(struct powernow_k8_data *data)
664{
665 struct psb_s *psb;
666 unsigned int i;
667 u32 mvs;
668 u8 maxvid;
669 u32 cpst = 0;
670 u32 thiscpuid;
671
672 for (i = 0xc0000; i < 0xffff0; i += 0x10) {
673
674
675
676 psb = phys_to_virt(i);
677 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
678 continue;
679
680 pr_debug("found PSB header at 0x%p\n", psb);
681
682 pr_debug("table vers: 0x%x\n", psb->tableversion);
683 if (psb->tableversion != PSB_VERSION_1_4) {
684 printk(KERN_ERR FW_BUG PFX "PSB table is not v1.4\n");
685 return -ENODEV;
686 }
687
688 pr_debug("flags: 0x%x\n", psb->flags1);
689 if (psb->flags1) {
690 printk(KERN_ERR FW_BUG PFX "unknown flags\n");
691 return -ENODEV;
692 }
693
694 data->vstable = psb->vstable;
695 pr_debug("voltage stabilization time: %d(*20us)\n",
696 data->vstable);
697
698 pr_debug("flags2: 0x%x\n", psb->flags2);
699 data->rvo = psb->flags2 & 3;
700 data->irt = ((psb->flags2) >> 2) & 3;
701 mvs = ((psb->flags2) >> 4) & 3;
702 data->vidmvs = 1 << mvs;
703 data->batps = ((psb->flags2) >> 6) & 3;
704
705 pr_debug("ramp voltage offset: %d\n", data->rvo);
706 pr_debug("isochronous relief time: %d\n", data->irt);
707 pr_debug("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
708
709 pr_debug("numpst: 0x%x\n", psb->num_tables);
710 cpst = psb->num_tables;
711 if ((psb->cpuid == 0x00000fc0) ||
712 (psb->cpuid == 0x00000fe0)) {
713 thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
714 if ((thiscpuid == 0x00000fc0) ||
715 (thiscpuid == 0x00000fe0))
716 cpst = 1;
717 }
718 if (cpst != 1) {
719 printk(KERN_ERR FW_BUG PFX "numpst must be 1\n");
720 return -ENODEV;
721 }
722
723 data->plllock = psb->plllocktime;
724 pr_debug("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
725 pr_debug("maxfid: 0x%x\n", psb->maxfid);
726 pr_debug("maxvid: 0x%x\n", psb->maxvid);
727 maxvid = psb->maxvid;
728
729 data->numps = psb->numps;
730 pr_debug("numpstates: 0x%x\n", data->numps);
731 return fill_powernow_table(data,
732 (struct pst_s *)(psb+1), maxvid);
733 }
734
735
736
737
738
739
740
741
742
743
744
745 printk(KERN_ERR FW_BUG PFX "No PSB or ACPI _PSS objects\n");
746 printk(KERN_ERR PFX "Make sure that your BIOS is up to date"
747 " and Cool'N'Quiet support is enabled in BIOS setup\n");
748 return -ENODEV;
749}
750
751static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data,
752 unsigned int index)
753{
754 u64 control;
755
756 if (!data->acpi_data.state_count)
757 return;
758
759 control = data->acpi_data.states[index].control;
760 data->irt = (control >> IRT_SHIFT) & IRT_MASK;
761 data->rvo = (control >> RVO_SHIFT) & RVO_MASK;
762 data->exttype = (control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
763 data->plllock = (control >> PLL_L_SHIFT) & PLL_L_MASK;
764 data->vidmvs = 1 << ((control >> MVS_SHIFT) & MVS_MASK);
765 data->vstable = (control >> VST_SHIFT) & VST_MASK;
766}
767
768static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
769{
770 struct cpufreq_frequency_table *powernow_table;
771 int ret_val = -ENODEV;
772 u64 control, status;
773
774 if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
775 pr_debug("register performance failed: bad ACPI data\n");
776 return -EIO;
777 }
778
779
780 if (data->acpi_data.state_count <= 1) {
781 pr_debug("No ACPI P-States\n");
782 goto err_out;
783 }
784
785 control = data->acpi_data.control_register.space_id;
786 status = data->acpi_data.status_register.space_id;
787
788 if ((control != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
789 (status != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
790 pr_debug("Invalid control/status registers (%llx - %llx)\n",
791 control, status);
792 goto err_out;
793 }
794
795
796 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
797 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
798 if (!powernow_table) {
799 pr_debug("powernow_table memory alloc failure\n");
800 goto err_out;
801 }
802
803
804 data->numps = data->acpi_data.state_count;
805 powernow_k8_acpi_pst_values(data, 0);
806
807 ret_val = fill_powernow_table_fidvid(data, powernow_table);
808 if (ret_val)
809 goto err_out_mem;
810
811 powernow_table[data->acpi_data.state_count].frequency =
812 CPUFREQ_TABLE_END;
813 powernow_table[data->acpi_data.state_count].index = 0;
814 data->powernow_table = powernow_table;
815
816 if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
817 print_basics(data);
818
819
820 acpi_processor_notify_smm(THIS_MODULE);
821
822 if (!zalloc_cpumask_var(&data->acpi_data.shared_cpu_map, GFP_KERNEL)) {
823 printk(KERN_ERR PFX
824 "unable to alloc powernow_k8_data cpumask\n");
825 ret_val = -ENOMEM;
826 goto err_out_mem;
827 }
828
829 return 0;
830
831err_out_mem:
832 kfree(powernow_table);
833
834err_out:
835 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
836
837
838
839 data->acpi_data.state_count = 0;
840
841 return ret_val;
842}
843
844static int fill_powernow_table_fidvid(struct powernow_k8_data *data,
845 struct cpufreq_frequency_table *powernow_table)
846{
847 int i;
848
849 for (i = 0; i < data->acpi_data.state_count; i++) {
850 u32 fid;
851 u32 vid;
852 u32 freq, index;
853 u64 status, control;
854
855 if (data->exttype) {
856 status = data->acpi_data.states[i].status;
857 fid = status & EXT_FID_MASK;
858 vid = (status >> VID_SHIFT) & EXT_VID_MASK;
859 } else {
860 control = data->acpi_data.states[i].control;
861 fid = control & FID_MASK;
862 vid = (control >> VID_SHIFT) & VID_MASK;
863 }
864
865 pr_debug(" %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
866
867 index = fid | (vid<<8);
868 powernow_table[i].index = index;
869
870 freq = find_khz_freq_from_fid(fid);
871 powernow_table[i].frequency = freq;
872
873
874 if ((freq > (MAX_FREQ * 1000)) || (freq < (MIN_FREQ * 1000))) {
875 pr_debug("invalid freq %u kHz, ignoring\n", freq);
876 invalidate_entry(powernow_table, i);
877 continue;
878 }
879
880
881
882 if (vid == VID_OFF) {
883 pr_debug("invalid vid %u, ignoring\n", vid);
884 invalidate_entry(powernow_table, i);
885 continue;
886 }
887
888 if (freq != (data->acpi_data.states[i].core_frequency * 1000)) {
889 printk(KERN_INFO PFX "invalid freq entries "
890 "%u kHz vs. %u kHz\n", freq,
891 (unsigned int)
892 (data->acpi_data.states[i].core_frequency
893 * 1000));
894 invalidate_entry(powernow_table, i);
895 continue;
896 }
897 }
898 return 0;
899}
900
901static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
902{
903 if (data->acpi_data.state_count)
904 acpi_processor_unregister_performance(&data->acpi_data,
905 data->cpu);
906 free_cpumask_var(data->acpi_data.shared_cpu_map);
907}
908
909static int get_transition_latency(struct powernow_k8_data *data)
910{
911 int max_latency = 0;
912 int i;
913 for (i = 0; i < data->acpi_data.state_count; i++) {
914 int cur_latency = data->acpi_data.states[i].transition_latency
915 + data->acpi_data.states[i].bus_master_latency;
916 if (cur_latency > max_latency)
917 max_latency = cur_latency;
918 }
919 if (max_latency == 0) {
920 pr_err(FW_WARN PFX "Invalid zero transition latency\n");
921 max_latency = 1;
922 }
923
924 return 1000 * max_latency;
925}
926
927
928static int transition_frequency_fidvid(struct powernow_k8_data *data,
929 unsigned int index)
930{
931 u32 fid = 0;
932 u32 vid = 0;
933 int res, i;
934 struct cpufreq_freqs freqs;
935
936 pr_debug("cpu %d transition to index %u\n", smp_processor_id(), index);
937
938
939
940
941
942
943 fid = data->powernow_table[index].index & 0xFF;
944 vid = (data->powernow_table[index].index & 0xFF00) >> 8;
945
946 pr_debug("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
947
948 if (query_current_values_with_pending_wait(data))
949 return 1;
950
951 if ((data->currvid == vid) && (data->currfid == fid)) {
952 pr_debug("target matches current values (fid 0x%x, vid 0x%x)\n",
953 fid, vid);
954 return 0;
955 }
956
957 pr_debug("cpu %d, changing to fid 0x%x, vid 0x%x\n",
958 smp_processor_id(), fid, vid);
959 freqs.old = find_khz_freq_from_fid(data->currfid);
960 freqs.new = find_khz_freq_from_fid(fid);
961
962 for_each_cpu(i, data->available_cores) {
963 freqs.cpu = i;
964 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
965 }
966
967 res = transition_fid_vid(data, fid, vid);
968 if (res)
969 return res;
970
971 freqs.new = find_khz_freq_from_fid(data->currfid);
972
973 for_each_cpu(i, data->available_cores) {
974 freqs.cpu = i;
975 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
976 }
977 return res;
978}
979
980struct powernowk8_target_arg {
981 struct cpufreq_policy *pol;
982 unsigned targfreq;
983 unsigned relation;
984};
985
986static long powernowk8_target_fn(void *arg)
987{
988 struct powernowk8_target_arg *pta = arg;
989 struct cpufreq_policy *pol = pta->pol;
990 unsigned targfreq = pta->targfreq;
991 unsigned relation = pta->relation;
992 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
993 u32 checkfid;
994 u32 checkvid;
995 unsigned int newstate;
996 int ret;
997
998 if (!data)
999 return -EINVAL;
1000
1001 checkfid = data->currfid;
1002 checkvid = data->currvid;
1003
1004 if (pending_bit_stuck()) {
1005 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
1006 return -EIO;
1007 }
1008
1009 pr_debug("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
1010 pol->cpu, targfreq, pol->min, pol->max, relation);
1011
1012 if (query_current_values_with_pending_wait(data))
1013 return -EIO;
1014
1015 pr_debug("targ: curr fid 0x%x, vid 0x%x\n",
1016 data->currfid, data->currvid);
1017
1018 if ((checkvid != data->currvid) ||
1019 (checkfid != data->currfid)) {
1020 pr_info(PFX
1021 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
1022 checkfid, data->currfid,
1023 checkvid, data->currvid);
1024 }
1025
1026 if (cpufreq_frequency_table_target(pol, data->powernow_table,
1027 targfreq, relation, &newstate))
1028 return -EIO;
1029
1030 mutex_lock(&fidvid_mutex);
1031
1032 powernow_k8_acpi_pst_values(data, newstate);
1033
1034 ret = transition_frequency_fidvid(data, newstate);
1035
1036 if (ret) {
1037 printk(KERN_ERR PFX "transition frequency failed\n");
1038 mutex_unlock(&fidvid_mutex);
1039 return 1;
1040 }
1041 mutex_unlock(&fidvid_mutex);
1042
1043 pol->cur = find_khz_freq_from_fid(data->currfid);
1044
1045 return 0;
1046}
1047
1048
1049static int powernowk8_target(struct cpufreq_policy *pol,
1050 unsigned targfreq, unsigned relation)
1051{
1052 struct powernowk8_target_arg pta = { .pol = pol, .targfreq = targfreq,
1053 .relation = relation };
1054
1055 return work_on_cpu(pol->cpu, powernowk8_target_fn, &pta);
1056}
1057
1058
1059static int powernowk8_verify(struct cpufreq_policy *pol)
1060{
1061 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1062
1063 if (!data)
1064 return -EINVAL;
1065
1066 return cpufreq_frequency_table_verify(pol, data->powernow_table);
1067}
1068
1069struct init_on_cpu {
1070 struct powernow_k8_data *data;
1071 int rc;
1072};
1073
1074static void __cpuinit powernowk8_cpu_init_on_cpu(void *_init_on_cpu)
1075{
1076 struct init_on_cpu *init_on_cpu = _init_on_cpu;
1077
1078 if (pending_bit_stuck()) {
1079 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1080 init_on_cpu->rc = -ENODEV;
1081 return;
1082 }
1083
1084 if (query_current_values_with_pending_wait(init_on_cpu->data)) {
1085 init_on_cpu->rc = -ENODEV;
1086 return;
1087 }
1088
1089 fidvid_msr_init();
1090
1091 init_on_cpu->rc = 0;
1092}
1093
1094static const char missing_pss_msg[] =
1095 KERN_ERR
1096 FW_BUG PFX "No compatible ACPI _PSS objects found.\n"
1097 FW_BUG PFX "First, make sure Cool'N'Quiet is enabled in the BIOS.\n"
1098 FW_BUG PFX "If that doesn't help, try upgrading your BIOS.\n";
1099
1100
1101static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
1102{
1103 struct powernow_k8_data *data;
1104 struct init_on_cpu init_on_cpu;
1105 int rc;
1106
1107 if (!cpu_online(pol->cpu))
1108 return -ENODEV;
1109
1110 smp_call_function_single(pol->cpu, check_supported_cpu, &rc, 1);
1111 if (rc)
1112 return -ENODEV;
1113
1114 data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
1115 if (!data) {
1116 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1117 return -ENOMEM;
1118 }
1119
1120 data->cpu = pol->cpu;
1121
1122 if (powernow_k8_cpu_init_acpi(data)) {
1123
1124
1125
1126
1127 if (num_online_cpus() != 1) {
1128 printk_once(missing_pss_msg);
1129 goto err_out;
1130 }
1131 if (pol->cpu != 0) {
1132 printk(KERN_ERR FW_BUG PFX "No ACPI _PSS objects for "
1133 "CPU other than CPU0. Complain to your BIOS "
1134 "vendor.\n");
1135 goto err_out;
1136 }
1137 rc = find_psb_table(data);
1138 if (rc)
1139 goto err_out;
1140
1141
1142
1143 pol->cpuinfo.transition_latency = (
1144 ((data->rvo + 8) * data->vstable * VST_UNITS_20US) +
1145 ((1 << data->irt) * 30)) * 1000;
1146 } else
1147 pol->cpuinfo.transition_latency = get_transition_latency(data);
1148
1149
1150 init_on_cpu.data = data;
1151 smp_call_function_single(data->cpu, powernowk8_cpu_init_on_cpu,
1152 &init_on_cpu, 1);
1153 rc = init_on_cpu.rc;
1154 if (rc != 0)
1155 goto err_out_exit_acpi;
1156
1157 cpumask_copy(pol->cpus, cpu_core_mask(pol->cpu));
1158 data->available_cores = pol->cpus;
1159
1160 pol->cur = find_khz_freq_from_fid(data->currfid);
1161 pr_debug("policy current frequency %d kHz\n", pol->cur);
1162
1163
1164 if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1165 printk(KERN_ERR FW_BUG PFX "invalid powernow_table\n");
1166 powernow_k8_cpu_exit_acpi(data);
1167 kfree(data->powernow_table);
1168 kfree(data);
1169 return -EINVAL;
1170 }
1171
1172 cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1173
1174 pr_debug("cpu_init done, current fid 0x%x, vid 0x%x\n",
1175 data->currfid, data->currvid);
1176
1177 per_cpu(powernow_data, pol->cpu) = data;
1178
1179 return 0;
1180
1181err_out_exit_acpi:
1182 powernow_k8_cpu_exit_acpi(data);
1183
1184err_out:
1185 kfree(data);
1186 return -ENODEV;
1187}
1188
1189static int powernowk8_cpu_exit(struct cpufreq_policy *pol)
1190{
1191 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1192
1193 if (!data)
1194 return -EINVAL;
1195
1196 powernow_k8_cpu_exit_acpi(data);
1197
1198 cpufreq_frequency_table_put_attr(pol->cpu);
1199
1200 kfree(data->powernow_table);
1201 kfree(data);
1202 per_cpu(powernow_data, pol->cpu) = NULL;
1203
1204 return 0;
1205}
1206
1207static void query_values_on_cpu(void *_err)
1208{
1209 int *err = _err;
1210 struct powernow_k8_data *data = __this_cpu_read(powernow_data);
1211
1212 *err = query_current_values_with_pending_wait(data);
1213}
1214
1215static unsigned int powernowk8_get(unsigned int cpu)
1216{
1217 struct powernow_k8_data *data = per_cpu(powernow_data, cpu);
1218 unsigned int khz = 0;
1219 int err;
1220
1221 if (!data)
1222 return 0;
1223
1224 smp_call_function_single(cpu, query_values_on_cpu, &err, true);
1225 if (err)
1226 goto out;
1227
1228 khz = find_khz_freq_from_fid(data->currfid);
1229
1230
1231out:
1232 return khz;
1233}
1234
1235static struct freq_attr *powernow_k8_attr[] = {
1236 &cpufreq_freq_attr_scaling_available_freqs,
1237 NULL,
1238};
1239
1240static struct cpufreq_driver cpufreq_amd64_driver = {
1241 .verify = powernowk8_verify,
1242 .target = powernowk8_target,
1243 .bios_limit = acpi_processor_get_bios_limit,
1244 .init = powernowk8_cpu_init,
1245 .exit = powernowk8_cpu_exit,
1246 .get = powernowk8_get,
1247 .name = "powernow-k8",
1248 .owner = THIS_MODULE,
1249 .attr = powernow_k8_attr,
1250};
1251
1252static void __request_acpi_cpufreq(void)
1253{
1254 const char *cur_drv, *drv = "acpi-cpufreq";
1255
1256 cur_drv = cpufreq_get_current_driver();
1257 if (!cur_drv)
1258 goto request;
1259
1260 if (strncmp(cur_drv, drv, min_t(size_t, strlen(cur_drv), strlen(drv))))
1261 pr_warn(PFX "WTF driver: %s\n", cur_drv);
1262
1263 return;
1264
1265 request:
1266 pr_warn(PFX "This CPU is not supported anymore, using acpi-cpufreq instead.\n");
1267 request_module(drv);
1268}
1269
1270
1271static int __cpuinit powernowk8_init(void)
1272{
1273 unsigned int i, supported_cpus = 0;
1274 int ret;
1275
1276 if (static_cpu_has(X86_FEATURE_HW_PSTATE)) {
1277 __request_acpi_cpufreq();
1278 return -ENODEV;
1279 }
1280
1281 if (!x86_match_cpu(powernow_k8_ids))
1282 return -ENODEV;
1283
1284 get_online_cpus();
1285 for_each_online_cpu(i) {
1286 smp_call_function_single(i, check_supported_cpu, &ret, 1);
1287 if (!ret)
1288 supported_cpus++;
1289 }
1290
1291 if (supported_cpus != num_online_cpus()) {
1292 put_online_cpus();
1293 return -ENODEV;
1294 }
1295 put_online_cpus();
1296
1297 ret = cpufreq_register_driver(&cpufreq_amd64_driver);
1298 if (ret)
1299 return ret;
1300
1301 pr_info(PFX "Found %d %s (%d cpu cores) (" VERSION ")\n",
1302 num_online_nodes(), boot_cpu_data.x86_model_id, supported_cpus);
1303
1304 return ret;
1305}
1306
1307
1308static void __exit powernowk8_exit(void)
1309{
1310 pr_debug("exit\n");
1311
1312 cpufreq_unregister_driver(&cpufreq_amd64_driver);
1313}
1314
1315MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and "
1316 "Mark Langsdorf <mark.langsdorf@amd.com>");
1317MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1318MODULE_LICENSE("GPL");
1319
1320late_initcall(powernowk8_init);
1321module_exit(powernowk8_exit);
1322
