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[CPUFREQ] Typo in powernow-k8
[firewire-audio.git] / arch / i386 / kernel / cpu / cpufreq / powernow-k8.c
blob88425bd55e1216f2450181a3186d0b971402fa62
1 /*
2 * (c) 2003, 2004, 2005 Advanced Micro Devices, Inc.
3 * Your use of this code is subject to the terms and conditions of the
4 * GNU general public license version 2. See "COPYING" or
5 * http://www.gnu.org/licenses/gpl.html
6 *
7 * Support : mark.langsdorf@amd.com
8 *
9 * Based on the powernow-k7.c module written by Dave Jones.
10 * (C) 2003 Dave Jones <davej@codemonkey.org.uk> on behalf of SuSE Labs
11 * (C) 2004 Dominik Brodowski <linux@brodo.de>
12 * (C) 2004 Pavel Machek <pavel@suse.cz>
13 * Licensed under the terms of the GNU GPL License version 2.
14 * Based upon datasheets & sample CPUs kindly provided by AMD.
15 *
16 * Valuable input gratefully received from Dave Jones, Pavel Machek,
17 * Dominik Brodowski, and others.
18 * Originally developed by Paul Devriendt.
19 * Processor information obtained from Chapter 9 (Power and Thermal Management)
20 * of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
21 * Opteron Processors" available for download from www.amd.com
22 *
23 * Tables for specific CPUs can be inferred from
24 * http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/smp.h>
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/cpufreq.h>
32 #include <linux/slab.h>
33 #include <linux/string.h>
34 #include <linux/cpumask.h>
35 #include <linux/sched.h> /* for current / set_cpus_allowed() */
36
37 #include <asm/msr.h>
38 #include <asm/io.h>
39 #include <asm/delay.h>
40
41 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
42 #include <linux/acpi.h>
43 #include <linux/mutex.h>
44 #include <acpi/processor.h>
45 #endif
46
47 #define PFX "powernow-k8: "
48 #define BFX PFX "BIOS error: "
49 #define VERSION "version 1.60.2"
50 #include "powernow-k8.h"
51
52 /* serialize freq changes */
53 static DEFINE_MUTEX(fidvid_mutex);
54
55 static struct powernow_k8_data *powernow_data[NR_CPUS];
56
57 #ifndef CONFIG_SMP
58 static cpumask_t cpu_core_map[1];
59 #endif
60
61 /* Return a frequency in MHz, given an input fid */
62 static u32 find_freq_from_fid(u32 fid)
63 {
64 return 800 + (fid * 100);
65 }
66
67 /* Return a frequency in KHz, given an input fid */
68 static u32 find_khz_freq_from_fid(u32 fid)
69 {
70 return 1000 * find_freq_from_fid(fid);
71 }
72
73 /* Return a voltage in miliVolts, given an input vid */
74 static u32 find_millivolts_from_vid(struct powernow_k8_data *data, u32 vid)
75 {
76 return 1550-vid*25;
77 }
78
79 /* Return the vco fid for an input fid
80 *
81 * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
82 * only from corresponding high fids. This returns "high" fid corresponding to
83 * "low" one.
84 */
85 static u32 convert_fid_to_vco_fid(u32 fid)
86 {
87 if (fid < HI_FID_TABLE_BOTTOM)
88 return 8 + (2 * fid);
89 else
90 return fid;
91 }
92
93 /*
94 * Return 1 if the pending bit is set. Unless we just instructed the processor
95 * to transition to a new state, seeing this bit set is really bad news.
96 */
97 static int pending_bit_stuck(void)
98 {
99 u32 lo, hi;
100
101 rdmsr(MSR_FIDVID_STATUS, lo, hi);
102 return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
103 }
104
105 /*
106 * Update the global current fid / vid values from the status msr.
107 * Returns 1 on error.
108 */
109 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
110 {
111 u32 lo, hi;
112 u32 i = 0;
113
114 do {
115 if (i++ > 10000) {
116 dprintk("detected change pending stuck\n");
117 return 1;
118 }
119 rdmsr(MSR_FIDVID_STATUS, lo, hi);
120 } while (lo & MSR_S_LO_CHANGE_PENDING);
121
122 data->currvid = hi & MSR_S_HI_CURRENT_VID;
123 data->currfid = lo & MSR_S_LO_CURRENT_FID;
124
125 return 0;
126 }
127
128 /* the isochronous relief time */
129 static void count_off_irt(struct powernow_k8_data *data)
130 {
131 udelay((1 << data->irt) * 10);
132 return;
133 }
134
135 /* the voltage stabalization time */
136 static void count_off_vst(struct powernow_k8_data *data)
137 {
138 udelay(data->vstable * VST_UNITS_20US);
139 return;
140 }
141
142 /* need to init the control msr to a safe value (for each cpu) */
143 static void fidvid_msr_init(void)
144 {
145 u32 lo, hi;
146 u8 fid, vid;
147
148 rdmsr(MSR_FIDVID_STATUS, lo, hi);
149 vid = hi & MSR_S_HI_CURRENT_VID;
150 fid = lo & MSR_S_LO_CURRENT_FID;
151 lo = fid | (vid << MSR_C_LO_VID_SHIFT);
152 hi = MSR_C_HI_STP_GNT_BENIGN;
153 dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
154 wrmsr(MSR_FIDVID_CTL, lo, hi);
155 }
156
157
158 /* write the new fid value along with the other control fields to the msr */
159 static int write_new_fid(struct powernow_k8_data *data, u32 fid)
160 {
161 u32 lo;
162 u32 savevid = data->currvid;
163 u32 i = 0;
164
165 if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
166 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
167 return 1;
168 }
169
170 lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
171
172 dprintk("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 "internal error - pending bit very stuck - no further pstate changes possible\n");
179 return 1;
180 }
181 } while (query_current_values_with_pending_wait(data));
182
183 count_off_irt(data);
184
185 if (savevid != data->currvid) {
186 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
187 savevid, data->currvid);
188 return 1;
189 }
190
191 if (fid != data->currfid) {
192 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
193 data->currfid);
194 return 1;
195 }
196
197 return 0;
198 }
199
200 /* Write a new vid to the hardware */
201 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
202 {
203 u32 lo;
204 u32 savefid = data->currfid;
205 int i = 0;
206
207 if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
208 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
209 return 1;
210 }
211
212 lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
213
214 dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
215 vid, lo, STOP_GRANT_5NS);
216
217 do {
218 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
219 if (i++ > 100) {
220 printk(KERN_ERR PFX "internal error - pending bit very stuck - no further pstate changes possible\n");
221 return 1;
222 }
223 } while (query_current_values_with_pending_wait(data));
224
225 if (savefid != data->currfid) {
226 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
227 savefid, data->currfid);
228 return 1;
229 }
230
231 if (vid != data->currvid) {
232 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
233 data->currvid);
234 return 1;
235 }
236
237 return 0;
238 }
239
240 /*
241 * Reduce the vid by the max of step or reqvid.
242 * Decreasing vid codes represent increasing voltages:
243 * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
244 */
245 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
246 {
247 if ((data->currvid - reqvid) > step)
248 reqvid = data->currvid - step;
249
250 if (write_new_vid(data, reqvid))
251 return 1;
252
253 count_off_vst(data);
254
255 return 0;
256 }
257
258 /* Change the fid and vid, by the 3 phases. */
259 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
260 {
261 if (core_voltage_pre_transition(data, reqvid))
262 return 1;
263
264 if (core_frequency_transition(data, reqfid))
265 return 1;
266
267 if (core_voltage_post_transition(data, reqvid))
268 return 1;
269
270 if (query_current_values_with_pending_wait(data))
271 return 1;
272
273 if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
274 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
275 smp_processor_id(),
276 reqfid, reqvid, data->currfid, data->currvid);
277 return 1;
278 }
279
280 dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
281 smp_processor_id(), data->currfid, data->currvid);
282
283 return 0;
284 }
285
286 /* Phase 1 - core voltage transition ... setup voltage */
287 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
288 {
289 u32 rvosteps = data->rvo;
290 u32 savefid = data->currfid;
291 u32 maxvid, lo;
292
293 dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
294 smp_processor_id(),
295 data->currfid, data->currvid, reqvid, data->rvo);
296
297 rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
298 maxvid = 0x1f & (maxvid >> 16);
299 dprintk("ph1 maxvid=0x%x\n", maxvid);
300 if (reqvid < maxvid) /* lower numbers are higher voltages */
301 reqvid = maxvid;
302
303 while (data->currvid > reqvid) {
304 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
305 data->currvid, reqvid);
306 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
307 return 1;
308 }
309
310 while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
311 if (data->currvid == maxvid) {
312 rvosteps = 0;
313 } else {
314 dprintk("ph1: changing vid for rvo, req 0x%x\n",
315 data->currvid - 1);
316 if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
317 return 1;
318 rvosteps--;
319 }
320 }
321
322 if (query_current_values_with_pending_wait(data))
323 return 1;
324
325 if (savefid != data->currfid) {
326 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
327 return 1;
328 }
329
330 dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
331 data->currfid, data->currvid);
332
333 return 0;
334 }
335
336 /* Phase 2 - core frequency transition */
337 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
338 {
339 u32 vcoreqfid, vcocurrfid, vcofiddiff, fid_interval, savevid = data->currvid;
340
341 if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
342 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
343 reqfid, data->currfid);
344 return 1;
345 }
346
347 if (data->currfid == reqfid) {
348 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
349 return 0;
350 }
351
352 dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
353 smp_processor_id(),
354 data->currfid, data->currvid, reqfid);
355
356 vcoreqfid = convert_fid_to_vco_fid(reqfid);
357 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
358 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
359 : vcoreqfid - vcocurrfid;
360
361 while (vcofiddiff > 2) {
362 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
363
364 if (reqfid > data->currfid) {
365 if (data->currfid > LO_FID_TABLE_TOP) {
366 if (write_new_fid(data, data->currfid + fid_interval)) {
367 return 1;
368 }
369 } else {
370 if (write_new_fid
371 (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
372 return 1;
373 }
374 }
375 } else {
376 if (write_new_fid(data, data->currfid - fid_interval))
377 return 1;
378 }
379
380 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
381 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
382 : vcoreqfid - vcocurrfid;
383 }
384
385 if (write_new_fid(data, reqfid))
386 return 1;
387
388 if (query_current_values_with_pending_wait(data))
389 return 1;
390
391 if (data->currfid != reqfid) {
392 printk(KERN_ERR PFX
393 "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
394 data->currfid, reqfid);
395 return 1;
396 }
397
398 if (savevid != data->currvid) {
399 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
400 savevid, data->currvid);
401 return 1;
402 }
403
404 dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
405 data->currfid, data->currvid);
406
407 return 0;
408 }
409
410 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
411 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
412 {
413 u32 savefid = data->currfid;
414 u32 savereqvid = reqvid;
415
416 dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
417 smp_processor_id(),
418 data->currfid, data->currvid);
419
420 if (reqvid != data->currvid) {
421 if (write_new_vid(data, reqvid))
422 return 1;
423
424 if (savefid != data->currfid) {
425 printk(KERN_ERR PFX
426 "ph3: bad fid change, save 0x%x, curr 0x%x\n",
427 savefid, data->currfid);
428 return 1;
429 }
430
431 if (data->currvid != reqvid) {
432 printk(KERN_ERR PFX
433 "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
434 reqvid, data->currvid);
435 return 1;
436 }
437 }
438
439 if (query_current_values_with_pending_wait(data))
440 return 1;
441
442 if (savereqvid != data->currvid) {
443 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
444 return 1;
445 }
446
447 if (savefid != data->currfid) {
448 dprintk("ph3 failed, currfid changed 0x%x\n",
449 data->currfid);
450 return 1;
451 }
452
453 dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
454 data->currfid, data->currvid);
455
456 return 0;
457 }
458
459 static int check_supported_cpu(unsigned int cpu)
460 {
461 cpumask_t oldmask = CPU_MASK_ALL;
462 u32 eax, ebx, ecx, edx;
463 unsigned int rc = 0;
464
465 oldmask = current->cpus_allowed;
466 set_cpus_allowed(current, cpumask_of_cpu(cpu));
467
468 if (smp_processor_id() != cpu) {
469 printk(KERN_ERR PFX "limiting to cpu %u failed\n", cpu);
470 goto out;
471 }
472
473 if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
474 goto out;
475
476 eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
477 if ((eax & CPUID_XFAM) != CPUID_XFAM_K8)
478 goto out;
479
480 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
481 ((eax & CPUID_XMOD) > CPUID_XMOD_REV_G)) {
482 printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
483 goto out;
484 }
485
486 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
487 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
488 printk(KERN_INFO PFX
489 "No frequency change capabilities detected\n");
490 goto out;
491 }
492
493 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
494 if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
495 printk(KERN_INFO PFX "Power state transitions not supported\n");
496 goto out;
497 }
498
499 rc = 1;
500
501 out:
502 set_cpus_allowed(current, oldmask);
503 return rc;
504 }
505
506 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
507 {
508 unsigned int j;
509 u8 lastfid = 0xff;
510
511 for (j = 0; j < data->numps; j++) {
512 if (pst[j].vid > LEAST_VID) {
513 printk(KERN_ERR PFX "vid %d invalid : 0x%x\n", j, pst[j].vid);
514 return -EINVAL;
515 }
516 if (pst[j].vid < data->rvo) { /* vid + rvo >= 0 */
517 printk(KERN_ERR BFX "0 vid exceeded with pstate %d\n", j);
518 return -ENODEV;
519 }
520 if (pst[j].vid < maxvid + data->rvo) { /* vid + rvo >= maxvid */
521 printk(KERN_ERR BFX "maxvid exceeded with pstate %d\n", j);
522 return -ENODEV;
523 }
524 if (pst[j].fid > MAX_FID) {
525 printk(KERN_ERR BFX "maxfid exceeded with pstate %d\n", j);
526 return -ENODEV;
527 }
528 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
529 /* Only first fid is allowed to be in "low" range */
530 printk(KERN_ERR BFX "two low fids - %d : 0x%x\n", j, pst[j].fid);
531 return -EINVAL;
532 }
533 if (pst[j].fid < lastfid)
534 lastfid = pst[j].fid;
535 }
536 if (lastfid & 1) {
537 printk(KERN_ERR BFX "lastfid invalid\n");
538 return -EINVAL;
539 }
540 if (lastfid > LO_FID_TABLE_TOP)
541 printk(KERN_INFO BFX "first fid not from lo freq table\n");
542
543 return 0;
544 }
545
546 static void print_basics(struct powernow_k8_data *data)
547 {
548 int j;
549 for (j = 0; j < data->numps; j++) {
550 if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID)
551 printk(KERN_INFO PFX " %d : fid 0x%x (%d MHz), vid 0x%x (%d mV)\n", j,
552 data->powernow_table[j].index & 0xff,
553 data->powernow_table[j].frequency/1000,
554 data->powernow_table[j].index >> 8,
555 find_millivolts_from_vid(data, data->powernow_table[j].index >> 8));
556 }
557 if (data->batps)
558 printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
559 }
560
561 static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
562 {
563 struct cpufreq_frequency_table *powernow_table;
564 unsigned int j;
565
566 if (data->batps) { /* use ACPI support to get full speed on mains power */
567 printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
568 data->numps = data->batps;
569 }
570
571 for ( j=1; j<data->numps; j++ ) {
572 if (pst[j-1].fid >= pst[j].fid) {
573 printk(KERN_ERR PFX "PST out of sequence\n");
574 return -EINVAL;
575 }
576 }
577
578 if (data->numps < 2) {
579 printk(KERN_ERR PFX "no p states to transition\n");
580 return -ENODEV;
581 }
582
583 if (check_pst_table(data, pst, maxvid))
584 return -EINVAL;
585
586 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
587 * (data->numps + 1)), GFP_KERNEL);
588 if (!powernow_table) {
589 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
590 return -ENOMEM;
591 }
592
593 for (j = 0; j < data->numps; j++) {
594 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
595 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
596 powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
597 }
598 powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
599 powernow_table[data->numps].index = 0;
600
601 if (query_current_values_with_pending_wait(data)) {
602 kfree(powernow_table);
603 return -EIO;
604 }
605
606 dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
607 data->powernow_table = powernow_table;
608 print_basics(data);
609
610 for (j = 0; j < data->numps; j++)
611 if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
612 return 0;
613
614 dprintk("currfid/vid do not match PST, ignoring\n");
615 return 0;
616 }
617
618 /* Find and validate the PSB/PST table in BIOS. */
619 static int find_psb_table(struct powernow_k8_data *data)
620 {
621 struct psb_s *psb;
622 unsigned int i;
623 u32 mvs;
624 u8 maxvid;
625 u32 cpst = 0;
626 u32 thiscpuid;
627
628 for (i = 0xc0000; i < 0xffff0; i += 0x10) {
629 /* Scan BIOS looking for the signature. */
630 /* It can not be at ffff0 - it is too big. */
631
632 psb = phys_to_virt(i);
633 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
634 continue;
635
636 dprintk("found PSB header at 0x%p\n", psb);
637
638 dprintk("table vers: 0x%x\n", psb->tableversion);
639 if (psb->tableversion != PSB_VERSION_1_4) {
640 printk(KERN_ERR BFX "PSB table is not v1.4\n");
641 return -ENODEV;
642 }
643
644 dprintk("flags: 0x%x\n", psb->flags1);
645 if (psb->flags1) {
646 printk(KERN_ERR BFX "unknown flags\n");
647 return -ENODEV;
648 }
649
650 data->vstable = psb->vstable;
651 dprintk("voltage stabilization time: %d(*20us)\n", data->vstable);
652
653 dprintk("flags2: 0x%x\n", psb->flags2);
654 data->rvo = psb->flags2 & 3;
655 data->irt = ((psb->flags2) >> 2) & 3;
656 mvs = ((psb->flags2) >> 4) & 3;
657 data->vidmvs = 1 << mvs;
658 data->batps = ((psb->flags2) >> 6) & 3;
659
660 dprintk("ramp voltage offset: %d\n", data->rvo);
661 dprintk("isochronous relief time: %d\n", data->irt);
662 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
663
664 dprintk("numpst: 0x%x\n", psb->num_tables);
665 cpst = psb->num_tables;
666 if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){
667 thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
668 if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) {
669 cpst = 1;
670 }
671 }
672 if (cpst != 1) {
673 printk(KERN_ERR BFX "numpst must be 1\n");
674 return -ENODEV;
675 }
676
677 data->plllock = psb->plllocktime;
678 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
679 dprintk("maxfid: 0x%x\n", psb->maxfid);
680 dprintk("maxvid: 0x%x\n", psb->maxvid);
681 maxvid = psb->maxvid;
682
683 data->numps = psb->numps;
684 dprintk("numpstates: 0x%x\n", data->numps);
685 return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
686 }
687 /*
688 * If you see this message, complain to BIOS manufacturer. If
689 * he tells you "we do not support Linux" or some similar
690 * nonsense, remember that Windows 2000 uses the same legacy
691 * mechanism that the old Linux PSB driver uses. Tell them it
692 * is broken with Windows 2000.
693 *
694 * The reference to the AMD documentation is chapter 9 in the
695 * BIOS and Kernel Developer's Guide, which is available on
696 * www.amd.com
697 */
698 printk(KERN_ERR PFX "BIOS error - no PSB or ACPI _PSS objects\n");
699 return -ENODEV;
700 }
701
702 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
703 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
704 {
705 if (!data->acpi_data.state_count)
706 return;
707
708 data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
709 data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
710 data->exttype = (data->acpi_data.states[index].control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
711 data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
712 data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
713 data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
714 }
715
716 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
717 {
718 int i;
719 int cntlofreq = 0;
720 struct cpufreq_frequency_table *powernow_table;
721
722 if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
723 dprintk("register performance failed: bad ACPI data\n");
724 return -EIO;
725 }
726
727 /* verify the data contained in the ACPI structures */
728 if (data->acpi_data.state_count <= 1) {
729 dprintk("No ACPI P-States\n");
730 goto err_out;
731 }
732
733 if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
734 (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
735 dprintk("Invalid control/status registers (%x - %x)\n",
736 data->acpi_data.control_register.space_id,
737 data->acpi_data.status_register.space_id);
738 goto err_out;
739 }
740
741 /* fill in data->powernow_table */
742 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
743 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
744 if (!powernow_table) {
745 dprintk("powernow_table memory alloc failure\n");
746 goto err_out;
747 }
748
749 for (i = 0; i < data->acpi_data.state_count; i++) {
750 u32 fid;
751 u32 vid;
752
753 if (data->exttype) {
754 fid = data->acpi_data.states[i].status & FID_MASK;
755 vid = (data->acpi_data.states[i].status >> VID_SHIFT) & VID_MASK;
756 } else {
757 fid = data->acpi_data.states[i].control & FID_MASK;
758 vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
759 }
760
761 dprintk(" %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
762
763 powernow_table[i].index = fid; /* lower 8 bits */
764 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
765 powernow_table[i].frequency = find_khz_freq_from_fid(fid);
766
767 /* verify frequency is OK */
768 if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
769 (powernow_table[i].frequency < (MIN_FREQ * 1000))) {
770 dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
771 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
772 continue;
773 }
774
775 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
776 if (vid == VID_OFF) {
777 dprintk("invalid vid %u, ignoring\n", vid);
778 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
779 continue;
780 }
781
782 /* verify only 1 entry from the lo frequency table */
783 if (fid < HI_FID_TABLE_BOTTOM) {
784 if (cntlofreq) {
785 /* if both entries are the same, ignore this one ... */
786 if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
787 (powernow_table[i].index != powernow_table[cntlofreq].index)) {
788 printk(KERN_ERR PFX "Too many lo freq table entries\n");
789 goto err_out_mem;
790 }
791
792 dprintk("double low frequency table entry, ignoring it.\n");
793 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
794 continue;
795 } else
796 cntlofreq = i;
797 }
798
799 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
800 printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
801 powernow_table[i].frequency,
802 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
803 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
804 continue;
805 }
806 }
807
808 powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
809 powernow_table[data->acpi_data.state_count].index = 0;
810 data->powernow_table = powernow_table;
811
812 /* fill in data */
813 data->numps = data->acpi_data.state_count;
814 print_basics(data);
815 powernow_k8_acpi_pst_values(data, 0);
816
817 /* notify BIOS that we exist */
818 acpi_processor_notify_smm(THIS_MODULE);
819
820 return 0;
821
822 err_out_mem:
823 kfree(powernow_table);
824
825 err_out:
826 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
827
828 /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
829 data->acpi_data.state_count = 0;
830
831 return -ENODEV;
832 }
833
834 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
835 {
836 if (data->acpi_data.state_count)
837 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
838 }
839
840 #else
841 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
842 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
843 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
844 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
845
846 /* Take a frequency, and issue the fid/vid transition command */
847 static int transition_frequency(struct powernow_k8_data *data, unsigned int index)
848 {
849 u32 fid;
850 u32 vid;
851 int res, i;
852 struct cpufreq_freqs freqs;
853
854 dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
855
856 /* fid are the lower 8 bits of the index we stored into
857 * the cpufreq frequency table in find_psb_table, vid are
858 * the upper 8 bits.
859 */
860
861 fid = data->powernow_table[index].index & 0xFF;
862 vid = (data->powernow_table[index].index & 0xFF00) >> 8;
863
864 dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
865
866 if (query_current_values_with_pending_wait(data))
867 return 1;
868
869 if ((data->currvid == vid) && (data->currfid == fid)) {
870 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
871 fid, vid);
872 return 0;
873 }
874
875 if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
876 printk(KERN_ERR PFX
877 "ignoring illegal change in lo freq table-%x to 0x%x\n",
878 data->currfid, fid);
879 return 1;
880 }
881
882 dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
883 smp_processor_id(), fid, vid);
884
885 freqs.cpu = data->cpu;
886 freqs.old = find_khz_freq_from_fid(data->currfid);
887 freqs.new = find_khz_freq_from_fid(fid);
888 for_each_cpu_mask(i, cpu_core_map[data->cpu]) {
889 freqs.cpu = i;
890 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
891 }
892
893 res = transition_fid_vid(data, fid, vid);
894
895 freqs.new = find_khz_freq_from_fid(data->currfid);
896 for_each_cpu_mask(i, cpu_core_map[data->cpu]) {
897 freqs.cpu = i;
898 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
899 }
900 return res;
901 }
902
903 /* Driver entry point to switch to the target frequency */
904 static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation)
905 {
906 cpumask_t oldmask = CPU_MASK_ALL;
907 struct powernow_k8_data *data = powernow_data[pol->cpu];
908 u32 checkfid;
909 u32 checkvid;
910 unsigned int newstate;
911 int ret = -EIO;
912
913 if (!data)
914 return -EINVAL;
915
916 checkfid = data->currfid;
917 checkvid = data->currvid;
918
919 /* only run on specific CPU from here on */
920 oldmask = current->cpus_allowed;
921 set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
922
923 if (smp_processor_id() != pol->cpu) {
924 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
925 goto err_out;
926 }
927
928 if (pending_bit_stuck()) {
929 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
930 goto err_out;
931 }
932
933 dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
934 pol->cpu, targfreq, pol->min, pol->max, relation);
935
936 if (query_current_values_with_pending_wait(data)) {
937 ret = -EIO;
938 goto err_out;
939 }
940
941 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
942 data->currfid, data->currvid);
943
944 if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
945 printk(KERN_INFO PFX
946 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
947 checkfid, data->currfid, checkvid, data->currvid);
948 }
949
950 if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
951 goto err_out;
952
953 mutex_lock(&fidvid_mutex);
954
955 powernow_k8_acpi_pst_values(data, newstate);
956
957 if (transition_frequency(data, newstate)) {
958 printk(KERN_ERR PFX "transition frequency failed\n");
959 ret = 1;
960 mutex_unlock(&fidvid_mutex);
961 goto err_out;
962 }
963 mutex_unlock(&fidvid_mutex);
964
965 pol->cur = find_khz_freq_from_fid(data->currfid);
966 ret = 0;
967
968 err_out:
969 set_cpus_allowed(current, oldmask);
970 return ret;
971 }
972
973 /* Driver entry point to verify the policy and range of frequencies */
974 static int powernowk8_verify(struct cpufreq_policy *pol)
975 {
976 struct powernow_k8_data *data = powernow_data[pol->cpu];
977
978 if (!data)
979 return -EINVAL;
980
981 return cpufreq_frequency_table_verify(pol, data->powernow_table);
982 }
983
984 /* per CPU init entry point to the driver */
985 static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
986 {
987 struct powernow_k8_data *data;
988 cpumask_t oldmask = CPU_MASK_ALL;
989 int rc;
990
991 if (!cpu_online(pol->cpu))
992 return -ENODEV;
993
994 if (!check_supported_cpu(pol->cpu))
995 return -ENODEV;
996
997 data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
998 if (!data) {
999 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1000 return -ENOMEM;
1001 }
1002
1003 data->cpu = pol->cpu;
1004
1005 if (powernow_k8_cpu_init_acpi(data)) {
1006 /*
1007 * Use the PSB BIOS structure. This is only availabe on
1008 * an UP version, and is deprecated by AMD.
1009 */
1010
1011 if ((num_online_cpus() != 1) || (num_possible_cpus() != 1)) {
1012 printk(KERN_ERR PFX "MP systems not supported by PSB BIOS structure\n");
1013 kfree(data);
1014 return -ENODEV;
1015 }
1016 if (pol->cpu != 0) {
1017 printk(KERN_ERR PFX "init not cpu 0\n");
1018 kfree(data);
1019 return -ENODEV;
1020 }
1021 rc = find_psb_table(data);
1022 if (rc) {
1023 kfree(data);
1024 return -ENODEV;
1025 }
1026 }
1027
1028 /* only run on specific CPU from here on */
1029 oldmask = current->cpus_allowed;
1030 set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
1031
1032 if (smp_processor_id() != pol->cpu) {
1033 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1034 goto err_out;
1035 }
1036
1037 if (pending_bit_stuck()) {
1038 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1039 goto err_out;
1040 }
1041
1042 if (query_current_values_with_pending_wait(data))
1043 goto err_out;
1044
1045 fidvid_msr_init();
1046
1047 /* run on any CPU again */
1048 set_cpus_allowed(current, oldmask);
1049
1050 pol->governor = CPUFREQ_DEFAULT_GOVERNOR;
1051 pol->cpus = cpu_core_map[pol->cpu];
1052
1053 /* Take a crude guess here.
1054 * That guess was in microseconds, so multiply with 1000 */
1055 pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
1056 + (3 * (1 << data->irt) * 10)) * 1000;
1057
1058 pol->cur = find_khz_freq_from_fid(data->currfid);
1059 dprintk("policy current frequency %d kHz\n", pol->cur);
1060
1061 /* min/max the cpu is capable of */
1062 if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1063 printk(KERN_ERR PFX "invalid powernow_table\n");
1064 powernow_k8_cpu_exit_acpi(data);
1065 kfree(data->powernow_table);
1066 kfree(data);
1067 return -EINVAL;
1068 }
1069
1070 cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1071
1072 printk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1073 data->currfid, data->currvid);
1074
1075 powernow_data[pol->cpu] = data;
1076
1077 return 0;
1078
1079 err_out:
1080 set_cpus_allowed(current, oldmask);
1081 powernow_k8_cpu_exit_acpi(data);
1082
1083 kfree(data);
1084 return -ENODEV;
1085 }
1086
1087 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1088 {
1089 struct powernow_k8_data *data = powernow_data[pol->cpu];
1090
1091 if (!data)
1092 return -EINVAL;
1093
1094 powernow_k8_cpu_exit_acpi(data);
1095
1096 cpufreq_frequency_table_put_attr(pol->cpu);
1097
1098 kfree(data->powernow_table);
1099 kfree(data);
1100
1101 return 0;
1102 }
1103
1104 static unsigned int powernowk8_get (unsigned int cpu)
1105 {
1106 struct powernow_k8_data *data;
1107 cpumask_t oldmask = current->cpus_allowed;
1108 unsigned int khz = 0;
1109
1110 data = powernow_data[first_cpu(cpu_core_map[cpu])];
1111
1112 if (!data)
1113 return -EINVAL;
1114
1115 set_cpus_allowed(current, cpumask_of_cpu(cpu));
1116 if (smp_processor_id() != cpu) {
1117 printk(KERN_ERR PFX "limiting to CPU %d failed in powernowk8_get\n", cpu);
1118 set_cpus_allowed(current, oldmask);
1119 return 0;
1120 }
1121
1122 if (query_current_values_with_pending_wait(data))
1123 goto out;
1124
1125 khz = find_khz_freq_from_fid(data->currfid);
1126
1127 out:
1128 set_cpus_allowed(current, oldmask);
1129 return khz;
1130 }
1131
1132 static struct freq_attr* powernow_k8_attr[] = {
1133 &cpufreq_freq_attr_scaling_available_freqs,
1134 NULL,
1135 };
1136
1137 static struct cpufreq_driver cpufreq_amd64_driver = {
1138 .verify = powernowk8_verify,
1139 .target = powernowk8_target,
1140 .init = powernowk8_cpu_init,
1141 .exit = __devexit_p(powernowk8_cpu_exit),
1142 .get = powernowk8_get,
1143 .name = "powernow-k8",
1144 .owner = THIS_MODULE,
1145 .attr = powernow_k8_attr,
1146 };
1147
1148 /* driver entry point for init */
1149 static int __cpuinit powernowk8_init(void)
1150 {
1151 unsigned int i, supported_cpus = 0;
1152
1153 for_each_online_cpu(i) {
1154 if (check_supported_cpu(i))
1155 supported_cpus++;
1156 }
1157
1158 if (supported_cpus == num_online_cpus()) {
1159 printk(KERN_INFO PFX "Found %d AMD Athlon 64 / Opteron "
1160 "processors (" VERSION ")\n", supported_cpus);
1161 return cpufreq_register_driver(&cpufreq_amd64_driver);
1162 }
1163
1164 return -ENODEV;
1165 }
1166
1167 /* driver entry point for term */
1168 static void __exit powernowk8_exit(void)
1169 {
1170 dprintk("exit\n");
1171
1172 cpufreq_unregister_driver(&cpufreq_amd64_driver);
1173 }
1174
1175 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com>");
1176 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1177 MODULE_LICENSE("GPL");
1178
1179 late_initcall(powernowk8_init);
1180 module_exit(powernowk8_exit);
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