[PATCH] ARM SMP: TLB implementations only affect local CPU
[linux-2.6] / 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 : 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 infrerred 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
36 #include <asm/msr.h>
37 #include <asm/io.h>
38 #include <asm/delay.h>
39
40 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
41 #include <linux/acpi.h>
42 #include <acpi/processor.h>
43 #endif
44
45 #define PFX "powernow-k8: "
46 #define BFX PFX "BIOS error: "
47 #define VERSION "version 1.40.2"
48 #include "powernow-k8.h"
49
50 /* serialize freq changes  */
51 static DECLARE_MUTEX(fidvid_sem);
52
53 static struct powernow_k8_data *powernow_data[NR_CPUS];
54
55 #ifndef CONFIG_SMP
56 static cpumask_t cpu_core_map[1];
57 #endif
58
59 /* Return a frequency in MHz, given an input fid */
60 static u32 find_freq_from_fid(u32 fid)
61 {
62         return 800 + (fid * 100);
63 }
64
65 /* Return a frequency in KHz, given an input fid */
66 static u32 find_khz_freq_from_fid(u32 fid)
67 {
68         return 1000 * find_freq_from_fid(fid);
69 }
70
71 /* Return a voltage in miliVolts, given an input vid */
72 static u32 find_millivolts_from_vid(struct powernow_k8_data *data, u32 vid)
73 {
74         return 1550-vid*25;
75 }
76
77 /* Return the vco fid for an input fid
78  *
79  * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
80  * only from corresponding high fids. This returns "high" fid corresponding to
81  * "low" one.
82  */
83 static u32 convert_fid_to_vco_fid(u32 fid)
84 {
85         if (fid < HI_FID_TABLE_BOTTOM) {
86                 return 8 + (2 * fid);
87         } else {
88                 return fid;
89         }
90 }
91
92 /*
93  * Return 1 if the pending bit is set. Unless we just instructed the processor
94  * to transition to a new state, seeing this bit set is really bad news.
95  */
96 static int pending_bit_stuck(void)
97 {
98         u32 lo, hi;
99
100         rdmsr(MSR_FIDVID_STATUS, lo, hi);
101         return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
102 }
103
104 /*
105  * Update the global current fid / vid values from the status msr.
106  * Returns 1 on error.
107  */
108 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
109 {
110         u32 lo, hi;
111         u32 i = 0;
112
113         lo = MSR_S_LO_CHANGE_PENDING;
114         while (lo & MSR_S_LO_CHANGE_PENDING) {
115                 if (i++ > 0x1000000) {
116                         printk(KERN_ERR PFX "detected change pending stuck\n");
117                         return 1;
118                 }
119                 rdmsr(MSR_FIDVID_STATUS, lo, hi);
120         }
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
164         if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
165                 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
166                 return 1;
167         }
168
169         lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
170
171         dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
172                 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
173
174         wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
175
176         if (query_current_values_with_pending_wait(data))
177                 return 1;
178
179         count_off_irt(data);
180
181         if (savevid != data->currvid) {
182                 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
183                        savevid, data->currvid);
184                 return 1;
185         }
186
187         if (fid != data->currfid) {
188                 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
189                         data->currfid);
190                 return 1;
191         }
192
193         return 0;
194 }
195
196 /* Write a new vid to the hardware */
197 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
198 {
199         u32 lo;
200         u32 savefid = data->currfid;
201
202         if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
203                 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
204                 return 1;
205         }
206
207         lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
208
209         dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
210                 vid, lo, STOP_GRANT_5NS);
211
212         wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
213
214         if (query_current_values_with_pending_wait(data))
215                 return 1;
216
217         if (savefid != data->currfid) {
218                 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
219                        savefid, data->currfid);
220                 return 1;
221         }
222
223         if (vid != data->currvid) {
224                 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
225                                 data->currvid);
226                 return 1;
227         }
228
229         return 0;
230 }
231
232 /*
233  * Reduce the vid by the max of step or reqvid.
234  * Decreasing vid codes represent increasing voltages:
235  * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of 0x1f is off.
236  */
237 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
238 {
239         if ((data->currvid - reqvid) > step)
240                 reqvid = data->currvid - step;
241
242         if (write_new_vid(data, reqvid))
243                 return 1;
244
245         count_off_vst(data);
246
247         return 0;
248 }
249
250 /* Change the fid and vid, by the 3 phases. */
251 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
252 {
253         if (core_voltage_pre_transition(data, reqvid))
254                 return 1;
255
256         if (core_frequency_transition(data, reqfid))
257                 return 1;
258
259         if (core_voltage_post_transition(data, reqvid))
260                 return 1;
261
262         if (query_current_values_with_pending_wait(data))
263                 return 1;
264
265         if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
266                 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
267                                 smp_processor_id(),
268                                 reqfid, reqvid, data->currfid, data->currvid);
269                 return 1;
270         }
271
272         dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
273                 smp_processor_id(), data->currfid, data->currvid);
274
275         return 0;
276 }
277
278 /* Phase 1 - core voltage transition ... setup voltage */
279 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
280 {
281         u32 rvosteps = data->rvo;
282         u32 savefid = data->currfid;
283         u32 maxvid, lo;
284
285         dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
286                 smp_processor_id(),
287                 data->currfid, data->currvid, reqvid, data->rvo);
288
289         rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
290         maxvid = 0x1f & (maxvid >> 16);
291         dprintk("ph1 maxvid=0x%x\n", maxvid);
292         if (reqvid < maxvid) /* lower numbers are higher voltages */
293                 reqvid = maxvid;
294
295         while (data->currvid > reqvid) {
296                 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
297                         data->currvid, reqvid);
298                 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
299                         return 1;
300         }
301
302         while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
303                 if (data->currvid == maxvid) {
304                         rvosteps = 0;
305                 } else {
306                         dprintk("ph1: changing vid for rvo, req 0x%x\n",
307                                 data->currvid - 1);
308                         if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
309                                 return 1;
310                         rvosteps--;
311                 }
312         }
313
314         if (query_current_values_with_pending_wait(data))
315                 return 1;
316
317         if (savefid != data->currfid) {
318                 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
319                 return 1;
320         }
321
322         dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
323                 data->currfid, data->currvid);
324
325         return 0;
326 }
327
328 /* Phase 2 - core frequency transition */
329 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
330 {
331         u32 vcoreqfid, vcocurrfid, vcofiddiff, savevid = data->currvid;
332
333         if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
334                 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
335                         reqfid, data->currfid);
336                 return 1;
337         }
338
339         if (data->currfid == reqfid) {
340                 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
341                 return 0;
342         }
343
344         dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
345                 smp_processor_id(),
346                 data->currfid, data->currvid, reqfid);
347
348         vcoreqfid = convert_fid_to_vco_fid(reqfid);
349         vcocurrfid = convert_fid_to_vco_fid(data->currfid);
350         vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
351             : vcoreqfid - vcocurrfid;
352
353         while (vcofiddiff > 2) {
354                 if (reqfid > data->currfid) {
355                         if (data->currfid > LO_FID_TABLE_TOP) {
356                                 if (write_new_fid(data, data->currfid + 2)) {
357                                         return 1;
358                                 }
359                         } else {
360                                 if (write_new_fid
361                                     (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
362                                         return 1;
363                                 }
364                         }
365                 } else {
366                         if (write_new_fid(data, data->currfid - 2))
367                                 return 1;
368                 }
369
370                 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
371                 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
372                     : vcoreqfid - vcocurrfid;
373         }
374
375         if (write_new_fid(data, reqfid))
376                 return 1;
377
378         if (query_current_values_with_pending_wait(data))
379                 return 1;
380
381         if (data->currfid != reqfid) {
382                 printk(KERN_ERR PFX
383                         "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
384                         data->currfid, reqfid);
385                 return 1;
386         }
387
388         if (savevid != data->currvid) {
389                 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
390                         savevid, data->currvid);
391                 return 1;
392         }
393
394         dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
395                 data->currfid, data->currvid);
396
397         return 0;
398 }
399
400 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
401 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
402 {
403         u32 savefid = data->currfid;
404         u32 savereqvid = reqvid;
405
406         dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
407                 smp_processor_id(),
408                 data->currfid, data->currvid);
409
410         if (reqvid != data->currvid) {
411                 if (write_new_vid(data, reqvid))
412                         return 1;
413
414                 if (savefid != data->currfid) {
415                         printk(KERN_ERR PFX
416                                "ph3: bad fid change, save 0x%x, curr 0x%x\n",
417                                savefid, data->currfid);
418                         return 1;
419                 }
420
421                 if (data->currvid != reqvid) {
422                         printk(KERN_ERR PFX
423                                "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
424                                reqvid, data->currvid);
425                         return 1;
426                 }
427         }
428
429         if (query_current_values_with_pending_wait(data))
430                 return 1;
431
432         if (savereqvid != data->currvid) {
433                 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
434                 return 1;
435         }
436
437         if (savefid != data->currfid) {
438                 dprintk("ph3 failed, currfid changed 0x%x\n",
439                         data->currfid);
440                 return 1;
441         }
442
443         dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
444                 data->currfid, data->currvid);
445
446         return 0;
447 }
448
449 static int check_supported_cpu(unsigned int cpu)
450 {
451         cpumask_t oldmask = CPU_MASK_ALL;
452         u32 eax, ebx, ecx, edx;
453         unsigned int rc = 0;
454
455         oldmask = current->cpus_allowed;
456         set_cpus_allowed(current, cpumask_of_cpu(cpu));
457         schedule();
458
459         if (smp_processor_id() != cpu) {
460                 printk(KERN_ERR "limiting to cpu %u failed\n", cpu);
461                 goto out;
462         }
463
464         if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
465                 goto out;
466
467         eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
468         if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
469             ((eax & CPUID_XFAM) != CPUID_XFAM_K8) ||
470             ((eax & CPUID_XMOD) > CPUID_XMOD_REV_E)) {
471                 printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
472                 goto out;
473         }
474
475         eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
476         if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
477                 printk(KERN_INFO PFX
478                        "No frequency change capabilities detected\n");
479                 goto out;
480         }
481
482         cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
483         if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
484                 printk(KERN_INFO PFX "Power state transitions not supported\n");
485                 goto out;
486         }
487
488         rc = 1;
489
490 out:
491         set_cpus_allowed(current, oldmask);
492         schedule();
493         return rc;
494
495 }
496
497 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
498 {
499         unsigned int j;
500         u8 lastfid = 0xff;
501
502         for (j = 0; j < data->numps; j++) {
503                 if (pst[j].vid > LEAST_VID) {
504                         printk(KERN_ERR PFX "vid %d invalid : 0x%x\n", j, pst[j].vid);
505                         return -EINVAL;
506                 }
507                 if (pst[j].vid < data->rvo) {   /* vid + rvo >= 0 */
508                         printk(KERN_ERR BFX "0 vid exceeded with pstate %d\n", j);
509                         return -ENODEV;
510                 }
511                 if (pst[j].vid < maxvid + data->rvo) {  /* vid + rvo >= maxvid */
512                         printk(KERN_ERR BFX "maxvid exceeded with pstate %d\n", j);
513                         return -ENODEV;
514                 }
515                 if ((pst[j].fid > MAX_FID)
516                     || (pst[j].fid & 1)
517                     || (j && (pst[j].fid < HI_FID_TABLE_BOTTOM))) {
518                         /* Only first fid is allowed to be in "low" range */
519                         printk(KERN_ERR PFX "two low fids - %d : 0x%x\n", j, pst[j].fid);
520                         return -EINVAL;
521                 }
522                 if (pst[j].fid < lastfid)
523                         lastfid = pst[j].fid;
524         }
525         if (lastfid & 1) {
526                 printk(KERN_ERR PFX "lastfid invalid\n");
527                 return -EINVAL;
528         }
529         if (lastfid > LO_FID_TABLE_TOP)
530                 printk(KERN_INFO PFX  "first fid not from lo freq table\n");
531
532         return 0;
533 }
534
535 static void print_basics(struct powernow_k8_data *data)
536 {
537         int j;
538         for (j = 0; j < data->numps; j++) {
539                 if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID)
540                         printk(KERN_INFO PFX "   %d : fid 0x%x (%d MHz), vid 0x%x (%d mV)\n", j,
541                                 data->powernow_table[j].index & 0xff,
542                                 data->powernow_table[j].frequency/1000,
543                                 data->powernow_table[j].index >> 8,
544                                 find_millivolts_from_vid(data, data->powernow_table[j].index >> 8));
545         }
546         if (data->batps)
547                 printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
548 }
549
550 static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
551 {
552         struct cpufreq_frequency_table *powernow_table;
553         unsigned int j;
554
555         if (data->batps) {    /* use ACPI support to get full speed on mains power */
556                 printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
557                 data->numps = data->batps;
558         }
559
560         for ( j=1; j<data->numps; j++ ) {
561                 if (pst[j-1].fid >= pst[j].fid) {
562                         printk(KERN_ERR PFX "PST out of sequence\n");
563                         return -EINVAL;
564                 }
565         }
566
567         if (data->numps < 2) {
568                 printk(KERN_ERR PFX "no p states to transition\n");
569                 return -ENODEV;
570         }
571
572         if (check_pst_table(data, pst, maxvid))
573                 return -EINVAL;
574
575         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
576                 * (data->numps + 1)), GFP_KERNEL);
577         if (!powernow_table) {
578                 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
579                 return -ENOMEM;
580         }
581
582         for (j = 0; j < data->numps; j++) {
583                 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
584                 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
585                 powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
586         }
587         powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
588         powernow_table[data->numps].index = 0;
589
590         if (query_current_values_with_pending_wait(data)) {
591                 kfree(powernow_table);
592                 return -EIO;
593         }
594
595         dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
596         data->powernow_table = powernow_table;
597         print_basics(data);
598
599         for (j = 0; j < data->numps; j++)
600                 if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
601                         return 0;
602
603         dprintk("currfid/vid do not match PST, ignoring\n");
604         return 0;
605 }
606
607 /* Find and validate the PSB/PST table in BIOS. */
608 static int find_psb_table(struct powernow_k8_data *data)
609 {
610         struct psb_s *psb;
611         unsigned int i;
612         u32 mvs;
613         u8 maxvid;
614         u32 cpst = 0;
615         u32 thiscpuid;
616
617         for (i = 0xc0000; i < 0xffff0; i += 0x10) {
618                 /* Scan BIOS looking for the signature. */
619                 /* It can not be at ffff0 - it is too big. */
620
621                 psb = phys_to_virt(i);
622                 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
623                         continue;
624
625                 dprintk("found PSB header at 0x%p\n", psb);
626
627                 dprintk("table vers: 0x%x\n", psb->tableversion);
628                 if (psb->tableversion != PSB_VERSION_1_4) {
629                         printk(KERN_INFO BFX "PSB table is not v1.4\n");
630                         return -ENODEV;
631                 }
632
633                 dprintk("flags: 0x%x\n", psb->flags1);
634                 if (psb->flags1) {
635                         printk(KERN_ERR BFX "unknown flags\n");
636                         return -ENODEV;
637                 }
638
639                 data->vstable = psb->vstable;
640                 dprintk("voltage stabilization time: %d(*20us)\n", data->vstable);
641
642                 dprintk("flags2: 0x%x\n", psb->flags2);
643                 data->rvo = psb->flags2 & 3;
644                 data->irt = ((psb->flags2) >> 2) & 3;
645                 mvs = ((psb->flags2) >> 4) & 3;
646                 data->vidmvs = 1 << mvs;
647                 data->batps = ((psb->flags2) >> 6) & 3;
648
649                 dprintk("ramp voltage offset: %d\n", data->rvo);
650                 dprintk("isochronous relief time: %d\n", data->irt);
651                 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
652
653                 dprintk("numpst: 0x%x\n", psb->num_tables);
654                 cpst = psb->num_tables;
655                 if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){
656                         thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
657                         if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) {
658                                 cpst = 1;
659                         }
660                 }
661                 if (cpst != 1) {
662                         printk(KERN_ERR BFX "numpst must be 1\n");
663                         return -ENODEV;
664                 }
665
666                 data->plllock = psb->plllocktime;
667                 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
668                 dprintk("maxfid: 0x%x\n", psb->maxfid);
669                 dprintk("maxvid: 0x%x\n", psb->maxvid);
670                 maxvid = psb->maxvid;
671
672                 data->numps = psb->numps;
673                 dprintk("numpstates: 0x%x\n", data->numps);
674                 return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
675         }
676         /*
677          * If you see this message, complain to BIOS manufacturer. If
678          * he tells you "we do not support Linux" or some similar
679          * nonsense, remember that Windows 2000 uses the same legacy
680          * mechanism that the old Linux PSB driver uses. Tell them it
681          * is broken with Windows 2000.
682          *
683          * The reference to the AMD documentation is chapter 9 in the
684          * BIOS and Kernel Developer's Guide, which is available on
685          * www.amd.com
686          */
687         printk(KERN_INFO PFX "BIOS error - no PSB or ACPI _PSS objects\n");
688         return -ENODEV;
689 }
690
691 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
692 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
693 {
694         if (!data->acpi_data.state_count)
695                 return;
696
697         data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
698         data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
699         data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
700         data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
701         data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
702 }
703
704 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
705 {
706         int i;
707         int cntlofreq = 0;
708         struct cpufreq_frequency_table *powernow_table;
709
710         if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
711                 dprintk("register performance failed: bad ACPI data\n");
712                 return -EIO;
713         }
714
715         /* verify the data contained in the ACPI structures */
716         if (data->acpi_data.state_count <= 1) {
717                 dprintk("No ACPI P-States\n");
718                 goto err_out;
719         }
720
721         if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
722                 (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
723                 dprintk("Invalid control/status registers (%x - %x)\n",
724                         data->acpi_data.control_register.space_id,
725                         data->acpi_data.status_register.space_id);
726                 goto err_out;
727         }
728
729         /* fill in data->powernow_table */
730         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
731                 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
732         if (!powernow_table) {
733                 dprintk("powernow_table memory alloc failure\n");
734                 goto err_out;
735         }
736
737         for (i = 0; i < data->acpi_data.state_count; i++) {
738                 u32 fid = data->acpi_data.states[i].control & FID_MASK;
739                 u32 vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
740
741                 dprintk("   %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
742
743                 powernow_table[i].index = fid; /* lower 8 bits */
744                 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
745                 powernow_table[i].frequency = find_khz_freq_from_fid(fid);
746
747                 /* verify frequency is OK */
748                 if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
749                         (powernow_table[i].frequency < (MIN_FREQ * 1000))) {
750                         dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
751                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
752                         continue;
753                 }
754
755                 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
756                 if (vid == 0x1f) {
757                         dprintk("invalid vid %u, ignoring\n", vid);
758                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
759                         continue;
760                 }
761
762                 /* verify only 1 entry from the lo frequency table */
763                 if (fid < HI_FID_TABLE_BOTTOM) {
764                         if (cntlofreq) {
765                                 /* if both entries are the same, ignore this
766                                  * one... 
767                                  */
768                                 if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
769                                     (powernow_table[i].index != powernow_table[cntlofreq].index)) {
770                                         printk(KERN_ERR PFX "Too many lo freq table entries\n");
771                                         goto err_out_mem;
772                                 }
773
774                                 dprintk("double low frequency table entry, ignoring it.\n");
775                                 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
776                                 continue;
777                         } else
778                                 cntlofreq = i;
779                 }
780
781                 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
782                         printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
783                                 powernow_table[i].frequency,
784                                 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
785                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
786                         continue;
787                 }
788         }
789
790         powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
791         powernow_table[data->acpi_data.state_count].index = 0;
792         data->powernow_table = powernow_table;
793
794         /* fill in data */
795         data->numps = data->acpi_data.state_count;
796         print_basics(data);
797         powernow_k8_acpi_pst_values(data, 0);
798
799         /* notify BIOS that we exist */
800         acpi_processor_notify_smm(THIS_MODULE);
801
802         return 0;
803
804 err_out_mem:
805         kfree(powernow_table);
806
807 err_out:
808         acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
809
810         /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
811         data->acpi_data.state_count = 0;
812
813         return -ENODEV;
814 }
815
816 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
817 {
818         if (data->acpi_data.state_count)
819                 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
820 }
821
822 #else
823 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
824 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
825 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
826 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
827
828 /* Take a frequency, and issue the fid/vid transition command */
829 static int transition_frequency(struct powernow_k8_data *data, unsigned int index)
830 {
831         u32 fid;
832         u32 vid;
833         int res, i;
834         struct cpufreq_freqs freqs;
835
836         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
837
838         /* fid are the lower 8 bits of the index we stored into
839          * the cpufreq frequency table in find_psb_table, vid are 
840          * the upper 8 bits.
841          */
842
843         fid = data->powernow_table[index].index & 0xFF;
844         vid = (data->powernow_table[index].index & 0xFF00) >> 8;
845
846         dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
847
848         if (query_current_values_with_pending_wait(data))
849                 return 1;
850
851         if ((data->currvid == vid) && (data->currfid == fid)) {
852                 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
853                         fid, vid);
854                 return 0;
855         }
856
857         if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
858                 printk(KERN_ERR PFX
859                        "ignoring illegal change in lo freq table-%x to 0x%x\n",
860                        data->currfid, fid);
861                 return 1;
862         }
863
864         dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
865                 smp_processor_id(), fid, vid);
866
867         freqs.cpu = data->cpu;
868         freqs.old = find_khz_freq_from_fid(data->currfid);
869         freqs.new = find_khz_freq_from_fid(fid);
870         for_each_cpu_mask(i, cpu_core_map[data->cpu]) {
871                 freqs.cpu = i;
872                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
873         }
874
875         res = transition_fid_vid(data, fid, vid);
876
877         freqs.new = find_khz_freq_from_fid(data->currfid);
878         for_each_cpu_mask(i, cpu_core_map[data->cpu]) {
879                 freqs.cpu = i;
880                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
881         }
882         return res;
883 }
884
885 /* Driver entry point to switch to the target frequency */
886 static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation)
887 {
888         cpumask_t oldmask = CPU_MASK_ALL;
889         struct powernow_k8_data *data = powernow_data[pol->cpu];
890         u32 checkfid = data->currfid;
891         u32 checkvid = data->currvid;
892         unsigned int newstate;
893         int ret = -EIO;
894         int i;
895
896         /* only run on specific CPU from here on */
897         oldmask = current->cpus_allowed;
898         set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
899         schedule();
900
901         if (smp_processor_id() != pol->cpu) {
902                 printk(KERN_ERR "limiting to cpu %u failed\n", pol->cpu);
903                 goto err_out;
904         }
905
906         if (pending_bit_stuck()) {
907                 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
908                 goto err_out;
909         }
910
911         dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
912                 pol->cpu, targfreq, pol->min, pol->max, relation);
913
914         if (query_current_values_with_pending_wait(data)) {
915                 ret = -EIO;
916                 goto err_out;
917         }
918
919         dprintk("targ: curr fid 0x%x, vid 0x%x\n",
920                 data->currfid, data->currvid);
921
922         if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
923                 printk(KERN_INFO PFX
924                         "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
925                         checkfid, data->currfid, checkvid, data->currvid);
926         }
927
928         if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
929                 goto err_out;
930
931         down(&fidvid_sem);
932
933         for_each_cpu_mask(i, cpu_core_map[pol->cpu]) {
934                 /* make sure the sibling is initialized */
935                 if (!powernow_data[i]) {
936                         ret = 0;
937                         up(&fidvid_sem);
938                         goto err_out;
939                 }
940         }
941
942         powernow_k8_acpi_pst_values(data, newstate);
943
944         if (transition_frequency(data, newstate)) {
945                 printk(KERN_ERR PFX "transition frequency failed\n");
946                 ret = 1;
947                 up(&fidvid_sem);
948                 goto err_out;
949         }
950
951         /* Update all the fid/vids of our siblings */
952         for_each_cpu_mask(i, cpu_core_map[pol->cpu]) {
953                 powernow_data[i]->currvid = data->currvid;
954                 powernow_data[i]->currfid = data->currfid;
955         }       
956         up(&fidvid_sem);
957
958         pol->cur = find_khz_freq_from_fid(data->currfid);
959         ret = 0;
960
961 err_out:
962         set_cpus_allowed(current, oldmask);
963         schedule();
964
965         return ret;
966 }
967
968 /* Driver entry point to verify the policy and range of frequencies */
969 static int powernowk8_verify(struct cpufreq_policy *pol)
970 {
971         struct powernow_k8_data *data = powernow_data[pol->cpu];
972
973         return cpufreq_frequency_table_verify(pol, data->powernow_table);
974 }
975
976 /* per CPU init entry point to the driver */
977 static int __init powernowk8_cpu_init(struct cpufreq_policy *pol)
978 {
979         struct powernow_k8_data *data;
980         cpumask_t oldmask = CPU_MASK_ALL;
981         int rc;
982
983         if (!check_supported_cpu(pol->cpu))
984                 return -ENODEV;
985
986         data = kmalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
987         if (!data) {
988                 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
989                 return -ENOMEM;
990         }
991         memset(data,0,sizeof(struct powernow_k8_data));
992
993         data->cpu = pol->cpu;
994
995         if (powernow_k8_cpu_init_acpi(data)) {
996                 /*
997                  * Use the PSB BIOS structure. This is only availabe on
998                  * an UP version, and is deprecated by AMD.
999                  */
1000
1001                 if ((num_online_cpus() != 1) || (num_possible_cpus() != 1)) {
1002                         printk(KERN_ERR PFX "MP systems not supported by PSB BIOS structure\n");
1003                         kfree(data);
1004                         return -ENODEV;
1005                 }
1006                 if (pol->cpu != 0) {
1007                         printk(KERN_ERR PFX "init not cpu 0\n");
1008                         kfree(data);
1009                         return -ENODEV;
1010                 }
1011                 rc = find_psb_table(data);
1012                 if (rc) {
1013                         kfree(data);
1014                         return -ENODEV;
1015                 }
1016         }
1017
1018         /* only run on specific CPU from here on */
1019         oldmask = current->cpus_allowed;
1020         set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
1021         schedule();
1022
1023         if (smp_processor_id() != pol->cpu) {
1024                 printk(KERN_ERR "limiting to cpu %u failed\n", pol->cpu);
1025                 goto err_out;
1026         }
1027
1028         if (pending_bit_stuck()) {
1029                 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1030                 goto err_out;
1031         }
1032
1033         if (query_current_values_with_pending_wait(data))
1034                 goto err_out;
1035
1036         fidvid_msr_init();
1037
1038         /* run on any CPU again */
1039         set_cpus_allowed(current, oldmask);
1040         schedule();
1041
1042         pol->governor = CPUFREQ_DEFAULT_GOVERNOR;
1043         pol->cpus = cpu_core_map[pol->cpu];
1044
1045         /* Take a crude guess here. 
1046          * That guess was in microseconds, so multiply with 1000 */
1047         pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
1048             + (3 * (1 << data->irt) * 10)) * 1000;
1049
1050         pol->cur = find_khz_freq_from_fid(data->currfid);
1051         dprintk("policy current frequency %d kHz\n", pol->cur);
1052
1053         /* min/max the cpu is capable of */
1054         if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1055                 printk(KERN_ERR PFX "invalid powernow_table\n");
1056                 powernow_k8_cpu_exit_acpi(data);
1057                 kfree(data->powernow_table);
1058                 kfree(data);
1059                 return -EINVAL;
1060         }
1061
1062         cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1063
1064         printk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1065                data->currfid, data->currvid);
1066
1067         powernow_data[pol->cpu] = data;
1068
1069         return 0;
1070
1071 err_out:
1072         set_cpus_allowed(current, oldmask);
1073         schedule();
1074         powernow_k8_cpu_exit_acpi(data);
1075
1076         kfree(data);
1077         return -ENODEV;
1078 }
1079
1080 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1081 {
1082         struct powernow_k8_data *data = powernow_data[pol->cpu];
1083
1084         if (!data)
1085                 return -EINVAL;
1086
1087         powernow_k8_cpu_exit_acpi(data);
1088
1089         cpufreq_frequency_table_put_attr(pol->cpu);
1090
1091         kfree(data->powernow_table);
1092         kfree(data);
1093
1094         return 0;
1095 }
1096
1097 static unsigned int powernowk8_get (unsigned int cpu)
1098 {
1099         struct powernow_k8_data *data = powernow_data[cpu];
1100         cpumask_t oldmask = current->cpus_allowed;
1101         unsigned int khz = 0;
1102
1103         set_cpus_allowed(current, cpumask_of_cpu(cpu));
1104         if (smp_processor_id() != cpu) {
1105                 printk(KERN_ERR PFX "limiting to CPU %d failed in powernowk8_get\n", cpu);
1106                 set_cpus_allowed(current, oldmask);
1107                 return 0;
1108         }
1109         preempt_disable();
1110         
1111         if (query_current_values_with_pending_wait(data))
1112                 goto out;
1113
1114         khz = find_khz_freq_from_fid(data->currfid);
1115
1116  out:
1117         preempt_enable_no_resched();
1118         set_cpus_allowed(current, oldmask);
1119
1120         return khz;
1121 }
1122
1123 static struct freq_attr* powernow_k8_attr[] = {
1124         &cpufreq_freq_attr_scaling_available_freqs,
1125         NULL,
1126 };
1127
1128 static struct cpufreq_driver cpufreq_amd64_driver = {
1129         .verify = powernowk8_verify,
1130         .target = powernowk8_target,
1131         .init = powernowk8_cpu_init,
1132         .exit = __devexit_p(powernowk8_cpu_exit),
1133         .get = powernowk8_get,
1134         .name = "powernow-k8",
1135         .owner = THIS_MODULE,
1136         .attr = powernow_k8_attr,
1137 };
1138
1139 /* driver entry point for init */
1140 static int __init powernowk8_init(void)
1141 {
1142         unsigned int i, supported_cpus = 0;
1143
1144         for (i=0; i<NR_CPUS; i++) {
1145                 if (!cpu_online(i))
1146                         continue;
1147                 if (check_supported_cpu(i))
1148                         supported_cpus++;
1149         }
1150
1151         if (supported_cpus == num_online_cpus()) {
1152                 printk(KERN_INFO PFX "Found %d AMD Athlon 64 / Opteron processors (" VERSION ")\n",
1153                         supported_cpus);
1154                 return cpufreq_register_driver(&cpufreq_amd64_driver);
1155         }
1156
1157         return -ENODEV;
1158 }
1159
1160 /* driver entry point for term */
1161 static void __exit powernowk8_exit(void)
1162 {
1163         dprintk("exit\n");
1164
1165         cpufreq_unregister_driver(&cpufreq_amd64_driver);
1166 }
1167
1168 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com.");
1169 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1170 MODULE_LICENSE("GPL");
1171
1172 late_initcall(powernowk8_init);
1173 module_exit(powernowk8_exit);
1174