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Linux-2.6.12-rc2
[thirdparty/linux.git] / arch / i386 / kernel / cpu / cpufreq / powernow-k8.c
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 * Tables for specific CPUs can be infrerred from
23 * http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf
24 */
25
26 #include <linux/kernel.h>
27 #include <linux/smp.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/cpufreq.h>
31 #include <linux/slab.h>
32 #include <linux/string.h>
33
34 #include <asm/msr.h>
35 #include <asm/io.h>
36 #include <asm/delay.h>
37
38 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
39 #include <linux/acpi.h>
40 #include <acpi/processor.h>
41 #endif
42
43 #define PFX "powernow-k8: "
44 #define BFX PFX "BIOS error: "
45 #define VERSION "version 1.00.09e"
46 #include "powernow-k8.h"
47
48 /* serialize freq changes */
49 static DECLARE_MUTEX(fidvid_sem);
50
51 static struct powernow_k8_data *powernow_data[NR_CPUS];
52
53 /* Return a frequency in MHz, given an input fid */
54 static u32 find_freq_from_fid(u32 fid)
55 {
56 return 800 + (fid * 100);
57 }
58
59 /* Return a frequency in KHz, given an input fid */
60 static u32 find_khz_freq_from_fid(u32 fid)
61 {
62 return 1000 * find_freq_from_fid(fid);
63 }
64
65 /* Return a voltage in miliVolts, given an input vid */
66 static u32 find_millivolts_from_vid(struct powernow_k8_data *data, u32 vid)
67 {
68 return 1550-vid*25;
69 }
70
71 /* Return the vco fid for an input fid
72 *
73 * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
74 * only from corresponding high fids. This returns "high" fid corresponding to
75 * "low" one.
76 */
77 static u32 convert_fid_to_vco_fid(u32 fid)
78 {
79 if (fid < HI_FID_TABLE_BOTTOM) {
80 return 8 + (2 * fid);
81 } else {
82 return fid;
83 }
84 }
85
86 /*
87 * Return 1 if the pending bit is set. Unless we just instructed the processor
88 * to transition to a new state, seeing this bit set is really bad news.
89 */
90 static int pending_bit_stuck(void)
91 {
92 u32 lo, hi;
93
94 rdmsr(MSR_FIDVID_STATUS, lo, hi);
95 return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
96 }
97
98 /*
99 * Update the global current fid / vid values from the status msr.
100 * Returns 1 on error.
101 */
102 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
103 {
104 u32 lo, hi;
105 u32 i = 0;
106
107 lo = MSR_S_LO_CHANGE_PENDING;
108 while (lo & MSR_S_LO_CHANGE_PENDING) {
109 if (i++ > 0x1000000) {
110 printk(KERN_ERR PFX "detected change pending stuck\n");
111 return 1;
112 }
113 rdmsr(MSR_FIDVID_STATUS, lo, hi);
114 }
115
116 data->currvid = hi & MSR_S_HI_CURRENT_VID;
117 data->currfid = lo & MSR_S_LO_CURRENT_FID;
118
119 return 0;
120 }
121
122 /* the isochronous relief time */
123 static void count_off_irt(struct powernow_k8_data *data)
124 {
125 udelay((1 << data->irt) * 10);
126 return;
127 }
128
129 /* the voltage stabalization time */
130 static void count_off_vst(struct powernow_k8_data *data)
131 {
132 udelay(data->vstable * VST_UNITS_20US);
133 return;
134 }
135
136 /* need to init the control msr to a safe value (for each cpu) */
137 static void fidvid_msr_init(void)
138 {
139 u32 lo, hi;
140 u8 fid, vid;
141
142 rdmsr(MSR_FIDVID_STATUS, lo, hi);
143 vid = hi & MSR_S_HI_CURRENT_VID;
144 fid = lo & MSR_S_LO_CURRENT_FID;
145 lo = fid | (vid << MSR_C_LO_VID_SHIFT);
146 hi = MSR_C_HI_STP_GNT_BENIGN;
147 dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
148 wrmsr(MSR_FIDVID_CTL, lo, hi);
149 }
150
151
152 /* write the new fid value along with the other control fields to the msr */
153 static int write_new_fid(struct powernow_k8_data *data, u32 fid)
154 {
155 u32 lo;
156 u32 savevid = data->currvid;
157
158 if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
159 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
160 return 1;
161 }
162
163 lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
164
165 dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
166 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
167
168 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
169
170 if (query_current_values_with_pending_wait(data))
171 return 1;
172
173 count_off_irt(data);
174
175 if (savevid != data->currvid) {
176 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
177 savevid, data->currvid);
178 return 1;
179 }
180
181 if (fid != data->currfid) {
182 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
183 data->currfid);
184 return 1;
185 }
186
187 return 0;
188 }
189
190 /* Write a new vid to the hardware */
191 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
192 {
193 u32 lo;
194 u32 savefid = data->currfid;
195
196 if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
197 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
198 return 1;
199 }
200
201 lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
202
203 dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
204 vid, lo, STOP_GRANT_5NS);
205
206 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
207
208 if (query_current_values_with_pending_wait(data))
209 return 1;
210
211 if (savefid != data->currfid) {
212 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
213 savefid, data->currfid);
214 return 1;
215 }
216
217 if (vid != data->currvid) {
218 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
219 data->currvid);
220 return 1;
221 }
222
223 return 0;
224 }
225
226 /*
227 * Reduce the vid by the max of step or reqvid.
228 * Decreasing vid codes represent increasing voltages:
229 * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of 0x1f is off.
230 */
231 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
232 {
233 if ((data->currvid - reqvid) > step)
234 reqvid = data->currvid - step;
235
236 if (write_new_vid(data, reqvid))
237 return 1;
238
239 count_off_vst(data);
240
241 return 0;
242 }
243
244 /* Change the fid and vid, by the 3 phases. */
245 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
246 {
247 if (core_voltage_pre_transition(data, reqvid))
248 return 1;
249
250 if (core_frequency_transition(data, reqfid))
251 return 1;
252
253 if (core_voltage_post_transition(data, reqvid))
254 return 1;
255
256 if (query_current_values_with_pending_wait(data))
257 return 1;
258
259 if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
260 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
261 smp_processor_id(),
262 reqfid, reqvid, data->currfid, data->currvid);
263 return 1;
264 }
265
266 dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
267 smp_processor_id(), data->currfid, data->currvid);
268
269 return 0;
270 }
271
272 /* Phase 1 - core voltage transition ... setup voltage */
273 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
274 {
275 u32 rvosteps = data->rvo;
276 u32 savefid = data->currfid;
277
278 dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
279 smp_processor_id(),
280 data->currfid, data->currvid, reqvid, data->rvo);
281
282 while (data->currvid > reqvid) {
283 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
284 data->currvid, reqvid);
285 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
286 return 1;
287 }
288
289 while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
290 if (data->currvid == 0) {
291 rvosteps = 0;
292 } else {
293 dprintk("ph1: changing vid for rvo, req 0x%x\n",
294 data->currvid - 1);
295 if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
296 return 1;
297 rvosteps--;
298 }
299 }
300
301 if (query_current_values_with_pending_wait(data))
302 return 1;
303
304 if (savefid != data->currfid) {
305 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
306 return 1;
307 }
308
309 dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
310 data->currfid, data->currvid);
311
312 return 0;
313 }
314
315 /* Phase 2 - core frequency transition */
316 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
317 {
318 u32 vcoreqfid, vcocurrfid, vcofiddiff, savevid = data->currvid;
319
320 if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
321 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
322 reqfid, data->currfid);
323 return 1;
324 }
325
326 if (data->currfid == reqfid) {
327 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
328 return 0;
329 }
330
331 dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
332 smp_processor_id(),
333 data->currfid, data->currvid, reqfid);
334
335 vcoreqfid = convert_fid_to_vco_fid(reqfid);
336 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
337 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
338 : vcoreqfid - vcocurrfid;
339
340 while (vcofiddiff > 2) {
341 if (reqfid > data->currfid) {
342 if (data->currfid > LO_FID_TABLE_TOP) {
343 if (write_new_fid(data, data->currfid + 2)) {
344 return 1;
345 }
346 } else {
347 if (write_new_fid
348 (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
349 return 1;
350 }
351 }
352 } else {
353 if (write_new_fid(data, data->currfid - 2))
354 return 1;
355 }
356
357 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
358 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
359 : vcoreqfid - vcocurrfid;
360 }
361
362 if (write_new_fid(data, reqfid))
363 return 1;
364
365 if (query_current_values_with_pending_wait(data))
366 return 1;
367
368 if (data->currfid != reqfid) {
369 printk(KERN_ERR PFX
370 "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
371 data->currfid, reqfid);
372 return 1;
373 }
374
375 if (savevid != data->currvid) {
376 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
377 savevid, data->currvid);
378 return 1;
379 }
380
381 dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
382 data->currfid, data->currvid);
383
384 return 0;
385 }
386
387 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
388 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
389 {
390 u32 savefid = data->currfid;
391 u32 savereqvid = reqvid;
392
393 dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
394 smp_processor_id(),
395 data->currfid, data->currvid);
396
397 if (reqvid != data->currvid) {
398 if (write_new_vid(data, reqvid))
399 return 1;
400
401 if (savefid != data->currfid) {
402 printk(KERN_ERR PFX
403 "ph3: bad fid change, save 0x%x, curr 0x%x\n",
404 savefid, data->currfid);
405 return 1;
406 }
407
408 if (data->currvid != reqvid) {
409 printk(KERN_ERR PFX
410 "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
411 reqvid, data->currvid);
412 return 1;
413 }
414 }
415
416 if (query_current_values_with_pending_wait(data))
417 return 1;
418
419 if (savereqvid != data->currvid) {
420 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
421 return 1;
422 }
423
424 if (savefid != data->currfid) {
425 dprintk("ph3 failed, currfid changed 0x%x\n",
426 data->currfid);
427 return 1;
428 }
429
430 dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
431 data->currfid, data->currvid);
432
433 return 0;
434 }
435
436 static int check_supported_cpu(unsigned int cpu)
437 {
438 cpumask_t oldmask = CPU_MASK_ALL;
439 u32 eax, ebx, ecx, edx;
440 unsigned int rc = 0;
441
442 oldmask = current->cpus_allowed;
443 set_cpus_allowed(current, cpumask_of_cpu(cpu));
444 schedule();
445
446 if (smp_processor_id() != cpu) {
447 printk(KERN_ERR "limiting to cpu %u failed\n", cpu);
448 goto out;
449 }
450
451 if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
452 goto out;
453
454 eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
455 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
456 ((eax & CPUID_XFAM) != CPUID_XFAM_K8) ||
457 ((eax & CPUID_XMOD) > CPUID_XMOD_REV_E)) {
458 printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
459 goto out;
460 }
461
462 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
463 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
464 printk(KERN_INFO PFX
465 "No frequency change capabilities detected\n");
466 goto out;
467 }
468
469 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
470 if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
471 printk(KERN_INFO PFX "Power state transitions not supported\n");
472 goto out;
473 }
474
475 rc = 1;
476
477 out:
478 set_cpus_allowed(current, oldmask);
479 schedule();
480 return rc;
481
482 }
483
484 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
485 {
486 unsigned int j;
487 u8 lastfid = 0xff;
488
489 for (j = 0; j < data->numps; j++) {
490 if (pst[j].vid > LEAST_VID) {
491 printk(KERN_ERR PFX "vid %d invalid : 0x%x\n", j, pst[j].vid);
492 return -EINVAL;
493 }
494 if (pst[j].vid < data->rvo) { /* vid + rvo >= 0 */
495 printk(KERN_ERR BFX "0 vid exceeded with pstate %d\n", j);
496 return -ENODEV;
497 }
498 if (pst[j].vid < maxvid + data->rvo) { /* vid + rvo >= maxvid */
499 printk(KERN_ERR BFX "maxvid exceeded with pstate %d\n", j);
500 return -ENODEV;
501 }
502 if ((pst[j].fid > MAX_FID)
503 || (pst[j].fid & 1)
504 || (j && (pst[j].fid < HI_FID_TABLE_BOTTOM))) {
505 /* Only first fid is allowed to be in "low" range */
506 printk(KERN_ERR PFX "two low fids - %d : 0x%x\n", j, pst[j].fid);
507 return -EINVAL;
508 }
509 if (pst[j].fid < lastfid)
510 lastfid = pst[j].fid;
511 }
512 if (lastfid & 1) {
513 printk(KERN_ERR PFX "lastfid invalid\n");
514 return -EINVAL;
515 }
516 if (lastfid > LO_FID_TABLE_TOP)
517 printk(KERN_INFO PFX "first fid not from lo freq table\n");
518
519 return 0;
520 }
521
522 static void print_basics(struct powernow_k8_data *data)
523 {
524 int j;
525 for (j = 0; j < data->numps; j++) {
526 if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID)
527 printk(KERN_INFO PFX " %d : fid 0x%x (%d MHz), vid 0x%x (%d mV)\n", j,
528 data->powernow_table[j].index & 0xff,
529 data->powernow_table[j].frequency/1000,
530 data->powernow_table[j].index >> 8,
531 find_millivolts_from_vid(data, data->powernow_table[j].index >> 8));
532 }
533 if (data->batps)
534 printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
535 }
536
537 static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
538 {
539 struct cpufreq_frequency_table *powernow_table;
540 unsigned int j;
541
542 if (data->batps) { /* use ACPI support to get full speed on mains power */
543 printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
544 data->numps = data->batps;
545 }
546
547 for ( j=1; j<data->numps; j++ ) {
548 if (pst[j-1].fid >= pst[j].fid) {
549 printk(KERN_ERR PFX "PST out of sequence\n");
550 return -EINVAL;
551 }
552 }
553
554 if (data->numps < 2) {
555 printk(KERN_ERR PFX "no p states to transition\n");
556 return -ENODEV;
557 }
558
559 if (check_pst_table(data, pst, maxvid))
560 return -EINVAL;
561
562 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
563 * (data->numps + 1)), GFP_KERNEL);
564 if (!powernow_table) {
565 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
566 return -ENOMEM;
567 }
568
569 for (j = 0; j < data->numps; j++) {
570 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
571 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
572 powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
573 }
574 powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
575 powernow_table[data->numps].index = 0;
576
577 if (query_current_values_with_pending_wait(data)) {
578 kfree(powernow_table);
579 return -EIO;
580 }
581
582 dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
583 data->powernow_table = powernow_table;
584 print_basics(data);
585
586 for (j = 0; j < data->numps; j++)
587 if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
588 return 0;
589
590 dprintk("currfid/vid do not match PST, ignoring\n");
591 return 0;
592 }
593
594 /* Find and validate the PSB/PST table in BIOS. */
595 static int find_psb_table(struct powernow_k8_data *data)
596 {
597 struct psb_s *psb;
598 unsigned int i;
599 u32 mvs;
600 u8 maxvid;
601 u32 cpst = 0;
602 u32 thiscpuid;
603
604 for (i = 0xc0000; i < 0xffff0; i += 0x10) {
605 /* Scan BIOS looking for the signature. */
606 /* It can not be at ffff0 - it is too big. */
607
608 psb = phys_to_virt(i);
609 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
610 continue;
611
612 dprintk("found PSB header at 0x%p\n", psb);
613
614 dprintk("table vers: 0x%x\n", psb->tableversion);
615 if (psb->tableversion != PSB_VERSION_1_4) {
616 printk(KERN_INFO BFX "PSB table is not v1.4\n");
617 return -ENODEV;
618 }
619
620 dprintk("flags: 0x%x\n", psb->flags1);
621 if (psb->flags1) {
622 printk(KERN_ERR BFX "unknown flags\n");
623 return -ENODEV;
624 }
625
626 data->vstable = psb->vstable;
627 dprintk("voltage stabilization time: %d(*20us)\n", data->vstable);
628
629 dprintk("flags2: 0x%x\n", psb->flags2);
630 data->rvo = psb->flags2 & 3;
631 data->irt = ((psb->flags2) >> 2) & 3;
632 mvs = ((psb->flags2) >> 4) & 3;
633 data->vidmvs = 1 << mvs;
634 data->batps = ((psb->flags2) >> 6) & 3;
635
636 dprintk("ramp voltage offset: %d\n", data->rvo);
637 dprintk("isochronous relief time: %d\n", data->irt);
638 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
639
640 dprintk("numpst: 0x%x\n", psb->num_tables);
641 cpst = psb->num_tables;
642 if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){
643 thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
644 if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) {
645 cpst = 1;
646 }
647 }
648 if (cpst != 1) {
649 printk(KERN_ERR BFX "numpst must be 1\n");
650 return -ENODEV;
651 }
652
653 data->plllock = psb->plllocktime;
654 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
655 dprintk("maxfid: 0x%x\n", psb->maxfid);
656 dprintk("maxvid: 0x%x\n", psb->maxvid);
657 maxvid = psb->maxvid;
658
659 data->numps = psb->numps;
660 dprintk("numpstates: 0x%x\n", data->numps);
661 return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
662 }
663 /*
664 * If you see this message, complain to BIOS manufacturer. If
665 * he tells you "we do not support Linux" or some similar
666 * nonsense, remember that Windows 2000 uses the same legacy
667 * mechanism that the old Linux PSB driver uses. Tell them it
668 * is broken with Windows 2000.
669 *
670 * The reference to the AMD documentation is chapter 9 in the
671 * BIOS and Kernel Developer's Guide, which is available on
672 * www.amd.com
673 */
674 printk(KERN_ERR PFX "BIOS error - no PSB\n");
675 return -ENODEV;
676 }
677
678 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
679 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
680 {
681 if (!data->acpi_data.state_count)
682 return;
683
684 data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
685 data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
686 data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
687 data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
688 data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
689 }
690
691 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
692 {
693 int i;
694 int cntlofreq = 0;
695 struct cpufreq_frequency_table *powernow_table;
696
697 if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
698 dprintk("register performance failed\n");
699 return -EIO;
700 }
701
702 /* verify the data contained in the ACPI structures */
703 if (data->acpi_data.state_count <= 1) {
704 dprintk("No ACPI P-States\n");
705 goto err_out;
706 }
707
708 if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
709 (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
710 dprintk("Invalid control/status registers (%x - %x)\n",
711 data->acpi_data.control_register.space_id,
712 data->acpi_data.status_register.space_id);
713 goto err_out;
714 }
715
716 /* fill in data->powernow_table */
717 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
718 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
719 if (!powernow_table) {
720 dprintk("powernow_table memory alloc failure\n");
721 goto err_out;
722 }
723
724 for (i = 0; i < data->acpi_data.state_count; i++) {
725 u32 fid = data->acpi_data.states[i].control & FID_MASK;
726 u32 vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
727
728 dprintk(" %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
729
730 powernow_table[i].index = fid; /* lower 8 bits */
731 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
732 powernow_table[i].frequency = find_khz_freq_from_fid(fid);
733
734 /* verify frequency is OK */
735 if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
736 (powernow_table[i].frequency < (MIN_FREQ * 1000))) {
737 dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
738 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
739 continue;
740 }
741
742 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
743 if (vid == 0x1f) {
744 dprintk("invalid vid %u, ignoring\n", vid);
745 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
746 continue;
747 }
748
749 if (fid < HI_FID_TABLE_BOTTOM) {
750 if (cntlofreq) {
751 /* if both entries are the same, ignore this
752 * one...
753 */
754 if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
755 (powernow_table[i].index != powernow_table[cntlofreq].index)) {
756 printk(KERN_ERR PFX "Too many lo freq table entries\n");
757 goto err_out_mem;
758 }
759
760 dprintk("double low frequency table entry, ignoring it.\n");
761 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
762 continue;
763 } else
764 cntlofreq = i;
765 }
766
767 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
768 printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
769 powernow_table[i].frequency,
770 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
771 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
772 continue;
773 }
774 }
775
776 powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
777 powernow_table[data->acpi_data.state_count].index = 0;
778 data->powernow_table = powernow_table;
779
780 /* fill in data */
781 data->numps = data->acpi_data.state_count;
782 print_basics(data);
783 powernow_k8_acpi_pst_values(data, 0);
784
785 /* notify BIOS that we exist */
786 acpi_processor_notify_smm(THIS_MODULE);
787
788 return 0;
789
790 err_out_mem:
791 kfree(powernow_table);
792
793 err_out:
794 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
795
796 /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
797 data->acpi_data.state_count = 0;
798
799 return -ENODEV;
800 }
801
802 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
803 {
804 if (data->acpi_data.state_count)
805 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
806 }
807
808 #else
809 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
810 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
811 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
812 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
813
814 /* Take a frequency, and issue the fid/vid transition command */
815 static int transition_frequency(struct powernow_k8_data *data, unsigned int index)
816 {
817 u32 fid;
818 u32 vid;
819 int res;
820 struct cpufreq_freqs freqs;
821
822 dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
823
824 /* fid are the lower 8 bits of the index we stored into
825 * the cpufreq frequency table in find_psb_table, vid are
826 * the upper 8 bits.
827 */
828
829 fid = data->powernow_table[index].index & 0xFF;
830 vid = (data->powernow_table[index].index & 0xFF00) >> 8;
831
832 dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
833
834 if (query_current_values_with_pending_wait(data))
835 return 1;
836
837 if ((data->currvid == vid) && (data->currfid == fid)) {
838 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
839 fid, vid);
840 return 0;
841 }
842
843 if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
844 printk("ignoring illegal change in lo freq table-%x to 0x%x\n",
845 data->currfid, fid);
846 return 1;
847 }
848
849 dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
850 smp_processor_id(), fid, vid);
851
852 freqs.cpu = data->cpu;
853
854 freqs.old = find_khz_freq_from_fid(data->currfid);
855 freqs.new = find_khz_freq_from_fid(fid);
856 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
857
858 down(&fidvid_sem);
859 res = transition_fid_vid(data, fid, vid);
860 up(&fidvid_sem);
861
862 freqs.new = find_khz_freq_from_fid(data->currfid);
863 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
864
865 return res;
866 }
867
868 /* Driver entry point to switch to the target frequency */
869 static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation)
870 {
871 cpumask_t oldmask = CPU_MASK_ALL;
872 struct powernow_k8_data *data = powernow_data[pol->cpu];
873 u32 checkfid = data->currfid;
874 u32 checkvid = data->currvid;
875 unsigned int newstate;
876 int ret = -EIO;
877
878 /* only run on specific CPU from here on */
879 oldmask = current->cpus_allowed;
880 set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
881 schedule();
882
883 if (smp_processor_id() != pol->cpu) {
884 printk(KERN_ERR "limiting to cpu %u failed\n", pol->cpu);
885 goto err_out;
886 }
887
888 if (pending_bit_stuck()) {
889 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
890 goto err_out;
891 }
892
893 dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
894 pol->cpu, targfreq, pol->min, pol->max, relation);
895
896 if (query_current_values_with_pending_wait(data)) {
897 ret = -EIO;
898 goto err_out;
899 }
900
901 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
902 data->currfid, data->currvid);
903
904 if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
905 printk(KERN_ERR PFX
906 "error - out of sync, fid 0x%x 0x%x, vid 0x%x 0x%x\n",
907 checkfid, data->currfid, checkvid, data->currvid);
908 }
909
910 if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
911 goto err_out;
912
913 powernow_k8_acpi_pst_values(data, newstate);
914
915 if (transition_frequency(data, newstate)) {
916 printk(KERN_ERR PFX "transition frequency failed\n");
917 ret = 1;
918 goto err_out;
919 }
920
921 pol->cur = find_khz_freq_from_fid(data->currfid);
922 ret = 0;
923
924 err_out:
925 set_cpus_allowed(current, oldmask);
926 schedule();
927
928 return ret;
929 }
930
931 /* Driver entry point to verify the policy and range of frequencies */
932 static int powernowk8_verify(struct cpufreq_policy *pol)
933 {
934 struct powernow_k8_data *data = powernow_data[pol->cpu];
935
936 return cpufreq_frequency_table_verify(pol, data->powernow_table);
937 }
938
939 /* per CPU init entry point to the driver */
940 static int __init powernowk8_cpu_init(struct cpufreq_policy *pol)
941 {
942 struct powernow_k8_data *data;
943 cpumask_t oldmask = CPU_MASK_ALL;
944 int rc;
945
946 if (!check_supported_cpu(pol->cpu))
947 return -ENODEV;
948
949 data = kmalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
950 if (!data) {
951 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
952 return -ENOMEM;
953 }
954 memset(data,0,sizeof(struct powernow_k8_data));
955
956 data->cpu = pol->cpu;
957
958 if (powernow_k8_cpu_init_acpi(data)) {
959 /*
960 * Use the PSB BIOS structure. This is only availabe on
961 * an UP version, and is deprecated by AMD.
962 */
963
964 if ((num_online_cpus() != 1) || (num_possible_cpus() != 1)) {
965 printk(KERN_INFO PFX "MP systems not supported by PSB BIOS structure\n");
966 kfree(data);
967 return -ENODEV;
968 }
969 if (pol->cpu != 0) {
970 printk(KERN_ERR PFX "init not cpu 0\n");
971 kfree(data);
972 return -ENODEV;
973 }
974 rc = find_psb_table(data);
975 if (rc) {
976 kfree(data);
977 return -ENODEV;
978 }
979 }
980
981 /* only run on specific CPU from here on */
982 oldmask = current->cpus_allowed;
983 set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
984 schedule();
985
986 if (smp_processor_id() != pol->cpu) {
987 printk(KERN_ERR "limiting to cpu %u failed\n", pol->cpu);
988 goto err_out;
989 }
990
991 if (pending_bit_stuck()) {
992 printk(KERN_ERR PFX "failing init, change pending bit set\n");
993 goto err_out;
994 }
995
996 if (query_current_values_with_pending_wait(data))
997 goto err_out;
998
999 fidvid_msr_init();
1000
1001 /* run on any CPU again */
1002 set_cpus_allowed(current, oldmask);
1003 schedule();
1004
1005 pol->governor = CPUFREQ_DEFAULT_GOVERNOR;
1006
1007 /* Take a crude guess here.
1008 * That guess was in microseconds, so multiply with 1000 */
1009 pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
1010 + (3 * (1 << data->irt) * 10)) * 1000;
1011
1012 pol->cur = find_khz_freq_from_fid(data->currfid);
1013 dprintk("policy current frequency %d kHz\n", pol->cur);
1014
1015 /* min/max the cpu is capable of */
1016 if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1017 printk(KERN_ERR PFX "invalid powernow_table\n");
1018 powernow_k8_cpu_exit_acpi(data);
1019 kfree(data->powernow_table);
1020 kfree(data);
1021 return -EINVAL;
1022 }
1023
1024 cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1025
1026 printk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1027 data->currfid, data->currvid);
1028
1029 powernow_data[pol->cpu] = data;
1030
1031 return 0;
1032
1033 err_out:
1034 set_cpus_allowed(current, oldmask);
1035 schedule();
1036 powernow_k8_cpu_exit_acpi(data);
1037
1038 kfree(data);
1039 return -ENODEV;
1040 }
1041
1042 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1043 {
1044 struct powernow_k8_data *data = powernow_data[pol->cpu];
1045
1046 if (!data)
1047 return -EINVAL;
1048
1049 powernow_k8_cpu_exit_acpi(data);
1050
1051 cpufreq_frequency_table_put_attr(pol->cpu);
1052
1053 kfree(data->powernow_table);
1054 kfree(data);
1055
1056 return 0;
1057 }
1058
1059 static unsigned int powernowk8_get (unsigned int cpu)
1060 {
1061 struct powernow_k8_data *data = powernow_data[cpu];
1062 cpumask_t oldmask = current->cpus_allowed;
1063 unsigned int khz = 0;
1064
1065 set_cpus_allowed(current, cpumask_of_cpu(cpu));
1066 if (smp_processor_id() != cpu) {
1067 printk(KERN_ERR PFX "limiting to CPU %d failed in powernowk8_get\n", cpu);
1068 set_cpus_allowed(current, oldmask);
1069 return 0;
1070 }
1071 preempt_disable();
1072
1073 if (query_current_values_with_pending_wait(data))
1074 goto out;
1075
1076 khz = find_khz_freq_from_fid(data->currfid);
1077
1078 out:
1079 preempt_enable_no_resched();
1080 set_cpus_allowed(current, oldmask);
1081
1082 return khz;
1083 }
1084
1085 static struct freq_attr* powernow_k8_attr[] = {
1086 &cpufreq_freq_attr_scaling_available_freqs,
1087 NULL,
1088 };
1089
1090 static struct cpufreq_driver cpufreq_amd64_driver = {
1091 .verify = powernowk8_verify,
1092 .target = powernowk8_target,
1093 .init = powernowk8_cpu_init,
1094 .exit = __devexit_p(powernowk8_cpu_exit),
1095 .get = powernowk8_get,
1096 .name = "powernow-k8",
1097 .owner = THIS_MODULE,
1098 .attr = powernow_k8_attr,
1099 };
1100
1101 /* driver entry point for init */
1102 static int __init powernowk8_init(void)
1103 {
1104 unsigned int i, supported_cpus = 0;
1105
1106 for (i=0; i<NR_CPUS; i++) {
1107 if (!cpu_online(i))
1108 continue;
1109 if (check_supported_cpu(i))
1110 supported_cpus++;
1111 }
1112
1113 if (supported_cpus == num_online_cpus()) {
1114 printk(KERN_INFO PFX "Found %d AMD Athlon 64 / Opteron processors (" VERSION ")\n",
1115 supported_cpus);
1116 return cpufreq_register_driver(&cpufreq_amd64_driver);
1117 }
1118
1119 return -ENODEV;
1120 }
1121
1122 /* driver entry point for term */
1123 static void __exit powernowk8_exit(void)
1124 {
1125 dprintk("exit\n");
1126
1127 cpufreq_unregister_driver(&cpufreq_amd64_driver);
1128 }
1129
1130 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com>");
1131 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1132 MODULE_LICENSE("GPL");
1133
1134 late_initcall(powernowk8_init);
1135 module_exit(powernowk8_exit);
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