?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
initial commit with v2.6.9
[linux-2.6.9-moxart.git] / arch / i386 / kernel / cpu / cpufreq / powernow-k8.c
blobe52390d12c8d15fc8c3718f50acee21d8771273b
1 /*
2 * (c) 2003, 2004 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 : paul.devriendt@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 * Processor information obtained from Chapter 9 (Power and Thermal Management)
19 * of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
20 * Opteron Processors" available for download from www.amd.com
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/smp.h>
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/cpufreq.h>
28 #include <linux/slab.h>
29 #include <linux/string.h>
30
31 #include <asm/msr.h>
32 #include <asm/io.h>
33 #include <asm/delay.h>
34
35 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
36 #include <linux/acpi.h>
37 #include <acpi/processor.h>
38 #endif
39
40 #define PFX "powernow-k8: "
41 #define BFX PFX "BIOS error: "
42 #define VERSION "version 1.00.09b"
43 #include "powernow-k8.h"
44
45 /* serialize freq changes */
46 static DECLARE_MUTEX(fidvid_sem);
47
48 static struct powernow_k8_data *powernow_data[NR_CPUS];
49
50 /* Return a frequency in MHz, given an input fid */
51 static u32 find_freq_from_fid(u32 fid)
52 {
53 return 800 + (fid * 100);
54 }
55
56 /* Return a frequency in KHz, given an input fid */
57 static u32 find_khz_freq_from_fid(u32 fid)
58 {
59 return 1000 * find_freq_from_fid(fid);
60 }
61
62 /* Return a voltage in miliVolts, given an input vid */
63 static u32 find_millivolts_from_vid(struct powernow_k8_data *data, u32 vid)
64 {
65 return 1550-vid*25;
66 }
67
68 /* Return the vco fid for an input fid */
69 static u32 convert_fid_to_vco_fid(u32 fid)
70 {
71 if (fid < HI_FID_TABLE_BOTTOM) {
72 return 8 + (2 * fid);
73 } else {
74 return fid;
75 }
76 }
77
78 /*
79 * Return 1 if the pending bit is set. Unless we just instructed the processor
80 * to transition to a new state, seeing this bit set is really bad news.
81 */
82 static int pending_bit_stuck(void)
83 {
84 u32 lo, hi;
85
86 rdmsr(MSR_FIDVID_STATUS, lo, hi);
87 return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
88 }
89
90 /*
91 * Update the global current fid / vid values from the status msr.
92 * Returns 1 on error.
93 */
94 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
95 {
96 u32 lo, hi;
97 u32 i = 0;
98
99 lo = MSR_S_LO_CHANGE_PENDING;
100 while (lo & MSR_S_LO_CHANGE_PENDING) {
101 if (i++ > 0x1000000) {
102 printk(KERN_ERR PFX "detected change pending stuck\n");
103 return 1;
104 }
105 rdmsr(MSR_FIDVID_STATUS, lo, hi);
106 }
107
108 data->currvid = hi & MSR_S_HI_CURRENT_VID;
109 data->currfid = lo & MSR_S_LO_CURRENT_FID;
110
111 return 0;
112 }
113
114 /* the isochronous relief time */
115 static void count_off_irt(struct powernow_k8_data *data)
116 {
117 udelay((1 << data->irt) * 10);
118 return;
119 }
120
121 /* the voltage stabalization time */
122 static void count_off_vst(struct powernow_k8_data *data)
123 {
124 udelay(data->vstable * VST_UNITS_20US);
125 return;
126 }
127
128 /* need to init the control msr to a safe value (for each cpu) */
129 static void fidvid_msr_init(void)
130 {
131 u32 lo, hi;
132 u8 fid, vid;
133
134 rdmsr(MSR_FIDVID_STATUS, lo, hi);
135 vid = hi & MSR_S_HI_CURRENT_VID;
136 fid = lo & MSR_S_LO_CURRENT_FID;
137 lo = fid | (vid << MSR_C_LO_VID_SHIFT);
138 hi = MSR_C_HI_STP_GNT_BENIGN;
139 dprintk(PFX "cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
140 wrmsr(MSR_FIDVID_CTL, lo, hi);
141 }
142
143
144 /* write the new fid value along with the other control fields to the msr */
145 static int write_new_fid(struct powernow_k8_data *data, u32 fid)
146 {
147 u32 lo;
148 u32 savevid = data->currvid;
149
150 if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
151 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
152 return 1;
153 }
154
155 lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
156
157 dprintk(KERN_DEBUG PFX "writing fid 0x%x, lo 0x%x, hi 0x%x\n",
158 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
159
160 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
161
162 if (query_current_values_with_pending_wait(data))
163 return 1;
164
165 count_off_irt(data);
166
167 if (savevid != data->currvid) {
168 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
169 savevid, data->currvid);
170 return 1;
171 }
172
173 if (fid != data->currfid) {
174 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
175 data->currfid);
176 return 1;
177 }
178
179 return 0;
180 }
181
182 /* Write a new vid to the hardware */
183 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
184 {
185 u32 lo;
186 u32 savefid = data->currfid;
187
188 if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
189 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
190 return 1;
191 }
192
193 lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
194
195 dprintk(KERN_DEBUG PFX "writing vid 0x%x, lo 0x%x, hi 0x%x\n",
196 vid, lo, STOP_GRANT_5NS);
197
198 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
199
200 if (query_current_values_with_pending_wait(data))
201 return 1;
202
203 if (savefid != data->currfid) {
204 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
205 savefid, data->currfid);
206 return 1;
207 }
208
209 if (vid != data->currvid) {
210 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
211 data->currvid);
212 return 1;
213 }
214
215 return 0;
216 }
217
218 /*
219 * Reduce the vid by the max of step or reqvid.
220 * Decreasing vid codes represent increasing voltages:
221 * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of 0x1f is off.
222 */
223 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
224 {
225 if ((data->currvid - reqvid) > step)
226 reqvid = data->currvid - step;
227
228 if (write_new_vid(data, reqvid))
229 return 1;
230
231 count_off_vst(data);
232
233 return 0;
234 }
235
236 /* Change the fid and vid, by the 3 phases. */
237 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
238 {
239 if (core_voltage_pre_transition(data, reqvid))
240 return 1;
241
242 if (core_frequency_transition(data, reqfid))
243 return 1;
244
245 if (core_voltage_post_transition(data, reqvid))
246 return 1;
247
248 if (query_current_values_with_pending_wait(data))
249 return 1;
250
251 if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
252 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
253 smp_processor_id(),
254 reqfid, reqvid, data->currfid, data->currvid);
255 return 1;
256 }
257
258 dprintk(KERN_INFO PFX "transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
259 smp_processor_id(), data->currfid, data->currvid);
260
261 return 0;
262 }
263
264 /* Phase 1 - core voltage transition ... setup voltage */
265 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
266 {
267 u32 rvosteps = data->rvo;
268 u32 savefid = data->currfid;
269
270 dprintk(KERN_DEBUG PFX
271 "ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
272 smp_processor_id(),
273 data->currfid, data->currvid, reqvid, data->rvo);
274
275 while (data->currvid > reqvid) {
276 dprintk(KERN_DEBUG PFX "ph1: curr 0x%x, req vid 0x%x\n",
277 data->currvid, reqvid);
278 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
279 return 1;
280 }
281
282 while (rvosteps > 0) {
283 if (data->currvid == 0) {
284 rvosteps = 0;
285 } else {
286 dprintk(KERN_DEBUG PFX
287 "ph1: changing vid for rvo, req 0x%x\n",
288 data->currvid - 1);
289 if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
290 return 1;
291 rvosteps--;
292 }
293 }
294
295 if (query_current_values_with_pending_wait(data))
296 return 1;
297
298 if (savefid != data->currfid) {
299 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
300 return 1;
301 }
302
303 dprintk(KERN_DEBUG PFX "ph1 complete, currfid 0x%x, currvid 0x%x\n",
304 data->currfid, data->currvid);
305
306 return 0;
307 }
308
309 /* Phase 2 - core frequency transition */
310 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
311 {
312 u32 vcoreqfid;
313 u32 vcocurrfid;
314 u32 vcofiddiff;
315 u32 savevid = data->currvid;
316
317 if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
318 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
319 reqfid, data->currfid);
320 return 1;
321 }
322
323 if (data->currfid == reqfid) {
324 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
325 return 0;
326 }
327
328 dprintk(KERN_DEBUG PFX
329 "ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
330 smp_processor_id(),
331 data->currfid, data->currvid, reqfid);
332
333 vcoreqfid = convert_fid_to_vco_fid(reqfid);
334 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
335 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
336 : vcoreqfid - vcocurrfid;
337
338 while (vcofiddiff > 2) {
339 if (reqfid > data->currfid) {
340 if (data->currfid > LO_FID_TABLE_TOP) {
341 if (write_new_fid(data, data->currfid + 2)) {
342 return 1;
343 }
344 } else {
345 if (write_new_fid
346 (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
347 return 1;
348 }
349 }
350 } else {
351 if (write_new_fid(data, data->currfid - 2))
352 return 1;
353 }
354
355 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
356 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
357 : vcoreqfid - vcocurrfid;
358 }
359
360 if (write_new_fid(data, reqfid))
361 return 1;
362
363 if (query_current_values_with_pending_wait(data))
364 return 1;
365
366 if (data->currfid != reqfid) {
367 printk(KERN_ERR PFX
368 "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
369 data->currfid, reqfid);
370 return 1;
371 }
372
373 if (savevid != data->currvid) {
374 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
375 savevid, data->currvid);
376 return 1;
377 }
378
379 dprintk(KERN_DEBUG PFX "ph2 complete, currfid 0x%x, currvid 0x%x\n",
380 data->currfid, data->currvid);
381
382 return 0;
383 }
384
385 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
386 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
387 {
388 u32 savefid = data->currfid;
389 u32 savereqvid = reqvid;
390
391 dprintk(KERN_DEBUG PFX "ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
392 smp_processor_id(),
393 data->currfid, data->currvid);
394
395 if (reqvid != data->currvid) {
396 if (write_new_vid(data, reqvid))
397 return 1;
398
399 if (savefid != data->currfid) {
400 printk(KERN_ERR PFX
401 "ph3: bad fid change, save 0x%x, curr 0x%x\n",
402 savefid, data->currfid);
403 return 1;
404 }
405
406 if (data->currvid != reqvid) {
407 printk(KERN_ERR PFX
408 "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
409 reqvid, data->currvid);
410 return 1;
411 }
412 }
413
414 if (query_current_values_with_pending_wait(data))
415 return 1;
416
417 if (savereqvid != data->currvid) {
418 dprintk(KERN_ERR PFX "ph3 failed, currvid 0x%x\n", data->currvid);
419 return 1;
420 }
421
422 if (savefid != data->currfid) {
423 dprintk(KERN_ERR PFX "ph3 failed, currfid changed 0x%x\n",
424 data->currfid);
425 return 1;
426 }
427
428 dprintk(KERN_DEBUG PFX "ph3 complete, currfid 0x%x, currvid 0x%x\n",
429 data->currfid, data->currvid);
430
431 return 0;
432 }
433
434 static int check_supported_cpu(unsigned int cpu)
435 {
436 cpumask_t oldmask = CPU_MASK_ALL;
437 u32 eax, ebx, ecx, edx;
438 unsigned int rc = 0;
439
440 oldmask = current->cpus_allowed;
441 set_cpus_allowed(current, cpumask_of_cpu(cpu));
442 schedule();
443
444 if (smp_processor_id() != cpu) {
445 printk(KERN_ERR "limiting to cpu %u failed\n", cpu);
446 goto out;
447 }
448
449 if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
450 goto out;
451
452 eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
453 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
454 ((eax & CPUID_XFAM) != CPUID_XFAM_K8) ||
455 ((eax & CPUID_XMOD) > CPUID_XMOD_REV_E)) {
456 printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
457 goto out;
458 }
459
460 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
461 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
462 printk(KERN_INFO PFX
463 "No frequency change capabilities detected\n");
464 goto out;
465 }
466
467 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
468 if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
469 printk(KERN_INFO PFX "Power state transitions not supported\n");
470 goto out;
471 }
472
473 rc = 1;
474
475 out:
476 set_cpus_allowed(current, oldmask);
477 schedule();
478 return rc;
479
480 }
481
482 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
483 {
484 unsigned int j;
485 u8 lastfid = 0xff;
486
487 for (j = 0; j < data->numps; j++) {
488 if (pst[j].vid > LEAST_VID) {
489 printk(KERN_ERR PFX "vid %d invalid : 0x%x\n", j, pst[j].vid);
490 return -EINVAL;
491 }
492 if (pst[j].vid < data->rvo) { /* vid + rvo >= 0 */
493 printk(KERN_ERR BFX "0 vid exceeded with pstate %d\n", j);
494 return -ENODEV;
495 }
496 if (pst[j].vid < maxvid + data->rvo) { /* vid + rvo >= maxvid */
497 printk(KERN_ERR BFX "maxvid exceeded with pstate %d\n", j);
498 return -ENODEV;
499 }
500 if ((pst[j].fid > MAX_FID)
501 || (pst[j].fid & 1)
502 || (j && (pst[j].fid < HI_FID_TABLE_BOTTOM))) {
503 /* Only first fid is allowed to be in "low" range */
504 printk(KERN_ERR PFX "fid %d invalid : 0x%x\n", j, pst[j].fid);
505 return -EINVAL;
506 }
507 if (pst[j].fid < lastfid)
508 lastfid = pst[j].fid;
509 }
510 if (lastfid & 1) {
511 printk(KERN_ERR PFX "lastfid invalid\n");
512 return -EINVAL;
513 }
514 if (lastfid > LO_FID_TABLE_TOP)
515 printk(KERN_INFO PFX "first fid not from lo freq table\n");
516
517 return 0;
518 }
519
520 static void print_basics(struct powernow_k8_data *data)
521 {
522 int j;
523 for (j = 0; j < data->numps; j++) {
524 if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID)
525 printk(KERN_INFO PFX " %d : fid 0x%x (%d MHz), vid 0x%x (%d mV)\n", j,
526 data->powernow_table[j].index & 0xff,
527 data->powernow_table[j].frequency/1000,
528 data->powernow_table[j].index >> 8,
529 find_millivolts_from_vid(data, data->powernow_table[j].index >> 8));
530 }
531 if (data->batps)
532 printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
533 }
534
535 static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
536 {
537 struct cpufreq_frequency_table *powernow_table;
538 unsigned int j;
539
540 if (data->batps) { /* use ACPI support to get full speed on mains power */
541 printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
542 data->numps = data->batps;
543 }
544
545 for ( j=1; j<data->numps; j++ ) {
546 if (pst[j-1].fid >= pst[j].fid) {
547 printk(KERN_ERR PFX "PST out of sequence\n");
548 return -EINVAL;
549 }
550 }
551
552 if (data->numps < 2) {
553 printk(KERN_ERR PFX "no p states to transition\n");
554 return -ENODEV;
555 }
556
557 if (check_pst_table(data, pst, maxvid))
558 return -EINVAL;
559
560 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
561 * (data->numps + 1)), GFP_KERNEL);
562 if (!powernow_table) {
563 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
564 return -ENOMEM;
565 }
566
567 for (j = 0; j < data->numps; j++) {
568 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
569 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
570 powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
571 }
572 powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
573 powernow_table[data->numps].index = 0;
574
575 if (query_current_values_with_pending_wait(data)) {
576 kfree(powernow_table);
577 return -EIO;
578 }
579
580 dprintk(KERN_INFO PFX "cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
581 data->powernow_table = powernow_table;
582 print_basics(data);
583
584 for (j = 0; j < data->numps; j++)
585 if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
586 return 0;
587
588 dprintk(KERN_ERR PFX "currfid/vid do not match PST, ignoring\n");
589 return 0;
590 }
591
592 /* Find and validate the PSB/PST table in BIOS. */
593 static int find_psb_table(struct powernow_k8_data *data)
594 {
595 struct psb_s *psb;
596 unsigned int i;
597 u32 mvs;
598 u8 maxvid;
599
600 for (i = 0xc0000; i < 0xffff0; i += 0x10) {
601 /* Scan BIOS looking for the signature. */
602 /* It can not be at ffff0 - it is too big. */
603
604 psb = phys_to_virt(i);
605 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
606 continue;
607
608 dprintk(KERN_DEBUG PFX "found PSB header at 0x%p\n", psb);
609
610 dprintk(KERN_DEBUG PFX "table vers: 0x%x\n", psb->tableversion);
611 if (psb->tableversion != PSB_VERSION_1_4) {
612 printk(KERN_INFO BFX "PSB table is not v1.4\n");
613 return -ENODEV;
614 }
615
616 dprintk(KERN_DEBUG PFX "flags: 0x%x\n", psb->flags1);
617 if (psb->flags1) {
618 printk(KERN_ERR BFX "unknown flags\n");
619 return -ENODEV;
620 }
621
622 data->vstable = psb->voltagestabilizationtime;
623 dprintk(KERN_INFO PFX "voltage stabilization time: %d(*20us)\n", data->vstable);
624
625 dprintk(KERN_DEBUG PFX "flags2: 0x%x\n", psb->flags2);
626 data->rvo = psb->flags2 & 3;
627 data->irt = ((psb->flags2) >> 2) & 3;
628 mvs = ((psb->flags2) >> 4) & 3;
629 data->vidmvs = 1 << mvs;
630 data->batps = ((psb->flags2) >> 6) & 3;
631
632 dprintk(KERN_INFO PFX "ramp voltage offset: %d\n", data->rvo);
633 dprintk(KERN_INFO PFX "isochronous relief time: %d\n", data->irt);
634 dprintk(KERN_INFO PFX "maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
635
636 dprintk(KERN_DEBUG PFX "numpst: 0x%x\n", psb->numpst);
637 if (psb->numpst != 1) {
638 printk(KERN_ERR BFX "numpst must be 1\n");
639 return -ENODEV;
640 }
641
642 data->plllock = psb->plllocktime;
643 dprintk(KERN_INFO PFX "plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
644 dprintk(KERN_INFO PFX "maxfid: 0x%x\n", psb->maxfid);
645 dprintk(KERN_INFO PFX "maxvid: 0x%x\n", psb->maxvid);
646 maxvid = psb->maxvid;
647
648 data->numps = psb->numpstates;
649 dprintk(KERN_INFO PFX "numpstates: 0x%x\n", data->numps);
650 return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
651 }
652 /*
653 * If you see this message, complain to BIOS manufacturer. If
654 * he tells you "we do not support Linux" or some similar
655 * nonsense, remember that Windows 2000 uses the same legacy
656 * mechanism that the old Linux PSB driver uses. Tell them it
657 * is broken with Windows 2000.
658 *
659 * The reference to the AMD documentation is chapter 9 in the
660 * BIOS and Kernel Developer's Guide, which is available on
661 * www.amd.com
662 */
663 printk(KERN_ERR PFX "BIOS error - no PSB\n");
664 return -ENODEV;
665 }
666
667 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
668 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
669 {
670 if (!data->acpi_data.state_count)
671 return;
672
673 data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
674 data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
675 data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
676 data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
677 data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
678 }
679
680 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
681 {
682 int i;
683 int cntlofreq = 0;
684 struct cpufreq_frequency_table *powernow_table;
685
686 if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
687 dprintk(KERN_DEBUG PFX "register performance failed\n");
688 return -EIO;
689 }
690
691 /* verify the data contained in the ACPI structures */
692 if (data->acpi_data.state_count <= 1) {
693 dprintk(KERN_DEBUG PFX "No ACPI P-States\n");
694 goto err_out;
695 }
696
697 if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
698 (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
699 dprintk(KERN_DEBUG PFX "Invalid control/status registers\n");
700 goto err_out;
701 }
702
703 /* fill in data->powernow_table */
704 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
705 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
706 if (!powernow_table) {
707 dprintk(KERN_ERR PFX "powernow_table memory alloc failure\n");
708 goto err_out;
709 }
710
711 for (i = 0; i < data->acpi_data.state_count; i++) {
712 u32 fid = data->acpi_data.states[i].control & FID_MASK;
713 u32 vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
714
715 dprintk(KERN_INFO PFX " %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
716
717 powernow_table[i].index = fid; /* lower 8 bits */
718 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
719 powernow_table[i].frequency = find_khz_freq_from_fid(fid);
720
721 /* verify frequency is OK */
722 if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
723 (powernow_table[i].frequency < (MIN_FREQ * 1000))) {
724 dprintk(KERN_INFO PFX "invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
725 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
726 continue;
727 }
728
729 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
730 if (vid == 0x1f) {
731 dprintk(KERN_INFO PFX "invalid vid %u, ignoring\n", vid);
732 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
733 continue;
734 }
735
736 if (fid < HI_FID_TABLE_BOTTOM) {
737 if (cntlofreq) {
738 /* if both entries are the same, ignore this
739 * one...
740 */
741 if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
742 (powernow_table[i].index != powernow_table[cntlofreq].index)) {
743 printk(KERN_ERR PFX "Too many lo freq table entries\n");
744 goto err_out_mem;
745 }
746
747 dprintk(KERN_INFO PFX "double low frequency table entry, ignoring it.\n");
748 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
749 continue;
750 } else
751 cntlofreq = i;
752 }
753
754 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
755 printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
756 powernow_table[i].frequency,
757 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
758 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
759 continue;
760 }
761 }
762
763 powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
764 powernow_table[data->acpi_data.state_count].index = 0;
765 data->powernow_table = powernow_table;
766
767 /* fill in data */
768 data->numps = data->acpi_data.state_count;
769 print_basics(data);
770 powernow_k8_acpi_pst_values(data, 0);
771 return 0;
772
773 err_out_mem:
774 kfree(powernow_table);
775
776 err_out:
777 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
778
779 /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
780 data->acpi_data.state_count = 0;
781
782 return -ENODEV;
783 }
784
785 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
786 {
787 if (data->acpi_data.state_count)
788 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
789 }
790
791 #else
792 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
793 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
794 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
795 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
796
797 /* Take a frequency, and issue the fid/vid transition command */
798 static int transition_frequency(struct powernow_k8_data *data, unsigned int index)
799 {
800 u32 fid;
801 u32 vid;
802 int res;
803 struct cpufreq_freqs freqs;
804
805 dprintk(KERN_DEBUG PFX "cpu %d transition to index %u\n",
806 smp_processor_id(), index );
807
808 /* fid are the lower 8 bits of the index we stored into
809 * the cpufreq frequency table in find_psb_table, vid are
810 * the upper 8 bits.
811 */
812
813 fid = data->powernow_table[index].index & 0xFF;
814 vid = (data->powernow_table[index].index & 0xFF00) >> 8;
815
816 dprintk(KERN_DEBUG PFX "table matched fid 0x%x, giving vid 0x%x\n",
817 fid, vid);
818
819 if (query_current_values_with_pending_wait(data))
820 return 1;
821
822 if ((data->currvid == vid) && (data->currfid == fid)) {
823 dprintk(KERN_DEBUG PFX
824 "target matches current values (fid 0x%x, vid 0x%x)\n",
825 fid, vid);
826 return 0;
827 }
828
829 if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
830 printk(KERN_ERR PFX
831 "ignoring illegal change in lo freq table-%x to 0x%x\n",
832 data->currfid, fid);
833 return 1;
834 }
835
836 dprintk(KERN_DEBUG PFX "cpu %d, changing to fid 0x%x, vid 0x%x\n",
837 smp_processor_id(), fid, vid);
838
839 freqs.cpu = data->cpu;
840
841 freqs.old = find_khz_freq_from_fid(data->currfid);
842 freqs.new = find_khz_freq_from_fid(fid);
843 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
844
845 down(&fidvid_sem);
846 res = transition_fid_vid(data, fid, vid);
847 up(&fidvid_sem);
848
849 freqs.new = find_khz_freq_from_fid(data->currfid);
850 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
851
852 return res;
853 }
854
855 /* Driver entry point to switch to the target frequency */
856 static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation)
857 {
858 cpumask_t oldmask = CPU_MASK_ALL;
859 struct powernow_k8_data *data = powernow_data[pol->cpu];
860 u32 checkfid = data->currfid;
861 u32 checkvid = data->currvid;
862 unsigned int newstate;
863 int ret = -EIO;
864
865 /* only run on specific CPU from here on */
866 oldmask = current->cpus_allowed;
867 set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
868 schedule();
869
870 if (smp_processor_id() != pol->cpu) {
871 printk(KERN_ERR "limiting to cpu %u failed\n", pol->cpu);
872 goto err_out;
873 }
874
875 if (pending_bit_stuck()) {
876 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
877 goto err_out;
878 }
879
880 dprintk(KERN_DEBUG PFX "targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
881 pol->cpu, targfreq, pol->min, pol->max, relation);
882
883 if (query_current_values_with_pending_wait(data)) {
884 ret = -EIO;
885 goto err_out;
886 }
887
888 dprintk(KERN_DEBUG PFX "targ: curr fid 0x%x, vid 0x%x\n",
889 data->currfid, data->currvid);
890
891 if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
892 printk(KERN_ERR PFX
893 "error - out of sync, fid 0x%x 0x%x, vid 0x%x 0x%x\n",
894 checkfid, data->currfid, checkvid, data->currvid);
895 }
896
897 if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
898 goto err_out;
899
900 powernow_k8_acpi_pst_values(data, newstate);
901
902 if (transition_frequency(data, newstate)) {
903 printk(KERN_ERR PFX "transition frequency failed\n");
904 ret = 1;
905 goto err_out;
906 }
907
908 pol->cur = find_khz_freq_from_fid(data->currfid);
909 ret = 0;
910
911 err_out:
912 set_cpus_allowed(current, oldmask);
913 schedule();
914
915 return ret;
916 }
917
918 /* Driver entry point to verify the policy and range of frequencies */
919 static int powernowk8_verify(struct cpufreq_policy *pol)
920 {
921 struct powernow_k8_data *data = powernow_data[pol->cpu];
922
923 return cpufreq_frequency_table_verify(pol, data->powernow_table);
924 }
925
926 /* per CPU init entry point to the driver */
927 static int __init powernowk8_cpu_init(struct cpufreq_policy *pol)
928 {
929 struct powernow_k8_data *data;
930 cpumask_t oldmask = CPU_MASK_ALL;
931 int rc;
932
933 if (!check_supported_cpu(pol->cpu))
934 return -ENODEV;
935
936 data = kmalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
937 if (!data) {
938 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
939 return -ENOMEM;
940 }
941 memset(data,0,sizeof(struct powernow_k8_data));
942
943 data->cpu = pol->cpu;
944
945 if (powernow_k8_cpu_init_acpi(data)) {
946 /*
947 * Use the PSB BIOS structure. This is only availabe on
948 * an UP version, and is deprecated by AMD.
949 */
950
951 if ((num_online_cpus() != 1) || (num_possible_cpus() != 1)) {
952 printk(KERN_INFO PFX "MP systems not supported by PSB BIOS structure\n");
953 kfree(data);
954 return -ENODEV;
955 }
956 if (pol->cpu != 0) {
957 printk(KERN_ERR PFX "init not cpu 0\n");
958 kfree(data);
959 return -ENODEV;
960 }
961 rc = find_psb_table(data);
962 if (rc) {
963 kfree(data);
964 return -ENODEV;
965 }
966 }
967
968 /* only run on specific CPU from here on */
969 oldmask = current->cpus_allowed;
970 set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
971 schedule();
972
973 if (smp_processor_id() != pol->cpu) {
974 printk(KERN_ERR "limiting to cpu %u failed\n", pol->cpu);
975 goto err_out;
976 }
977
978 if (pending_bit_stuck()) {
979 printk(KERN_ERR PFX "failing init, change pending bit set\n");
980 goto err_out;
981 }
982
983 if (query_current_values_with_pending_wait(data))
984 goto err_out;
985
986 fidvid_msr_init();
987
988 /* run on any CPU again */
989 set_cpus_allowed(current, oldmask);
990 schedule();
991
992 pol->governor = CPUFREQ_DEFAULT_GOVERNOR;
993
994 /* Take a crude guess here.
995 * That guess was in microseconds, so multiply with 1000 */
996 pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
997 + (3 * (1 << data->irt) * 10)) * 1000;
998
999 pol->cur = find_khz_freq_from_fid(data->currfid);
1000 dprintk(KERN_DEBUG PFX "policy current frequency %d kHz\n", pol->cur);
1001
1002 /* min/max the cpu is capable of */
1003 if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1004 printk(KERN_ERR PFX "invalid powernow_table\n");
1005 kfree(data->powernow_table);
1006 kfree(data);
1007 return -EINVAL;
1008 }
1009
1010 cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1011
1012 printk(KERN_INFO PFX "cpu_init done, current fid 0x%x, vid 0x%x\n",
1013 data->currfid, data->currvid);
1014
1015 powernow_data[pol->cpu] = data;
1016
1017 return 0;
1018
1019 err_out:
1020 set_cpus_allowed(current, oldmask);
1021 schedule();
1022
1023 kfree(data);
1024 return -ENODEV;
1025 }
1026
1027 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1028 {
1029 struct powernow_k8_data *data = powernow_data[pol->cpu];
1030
1031 if (!data)
1032 return -EINVAL;
1033
1034 powernow_k8_cpu_exit_acpi(data);
1035
1036 cpufreq_frequency_table_put_attr(pol->cpu);
1037
1038 kfree(data->powernow_table);
1039 kfree(data);
1040
1041 return 0;
1042 }
1043
1044 static unsigned int powernowk8_get (unsigned int cpu)
1045 {
1046 struct powernow_k8_data *data = powernow_data[cpu];
1047 cpumask_t oldmask = current->cpus_allowed;
1048 unsigned int khz = 0;
1049
1050 set_cpus_allowed(current, cpumask_of_cpu(cpu));
1051 if (smp_processor_id() != cpu) {
1052 printk(KERN_ERR PFX "limiting to CPU %d failed in powernowk8_get\n", cpu);
1053 set_cpus_allowed(current, oldmask);
1054 return 0;
1055 }
1056 preempt_disable();
1057
1058 if (query_current_values_with_pending_wait(data))
1059 goto out;
1060
1061 khz = find_khz_freq_from_fid(data->currfid);
1062
1063 out:
1064 preempt_enable_no_resched();
1065 set_cpus_allowed(current, oldmask);
1066
1067 return khz;
1068 }
1069
1070 static struct freq_attr* powernow_k8_attr[] = {
1071 &cpufreq_freq_attr_scaling_available_freqs,
1072 NULL,
1073 };
1074
1075 static struct cpufreq_driver cpufreq_amd64_driver = {
1076 .verify = powernowk8_verify,
1077 .target = powernowk8_target,
1078 .init = powernowk8_cpu_init,
1079 .exit = __devexit_p(powernowk8_cpu_exit),
1080 .get = powernowk8_get,
1081 .name = "powernow-k8",
1082 .owner = THIS_MODULE,
1083 .attr = powernow_k8_attr,
1084 };
1085
1086 /* driver entry point for init */
1087 static int __init powernowk8_init(void)
1088 {
1089 unsigned int i, supported_cpus = 0;
1090
1091 for (i=0; i<NR_CPUS; i++) {
1092 if (!cpu_online(i))
1093 continue;
1094 if (check_supported_cpu(i))
1095 supported_cpus++;
1096 }
1097
1098 if (supported_cpus == num_online_cpus()) {
1099 printk(KERN_INFO PFX "Found %d AMD Athlon 64 / Opteron processors (" VERSION ")\n",
1100 supported_cpus);
1101 return cpufreq_register_driver(&cpufreq_amd64_driver);
1102 }
1103
1104 return -ENODEV;
1105 }
1106
1107 /* driver entry point for term */
1108 static void __exit powernowk8_exit(void)
1109 {
1110 dprintk(KERN_INFO PFX "exit\n");
1111
1112 cpufreq_unregister_driver(&cpufreq_amd64_driver);
1113 }
1114
1115 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com>");
1116 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1117 MODULE_LICENSE("GPL");
1118
1119 late_initcall(powernowk8_init);
1120 module_exit(powernowk8_exit);
MOXA 2.6.9 from sdlinux-moxaart.tgz