Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6
[linux-2.6] / arch / x86 / kernel / cpu / cpufreq / powernow-k8.c
1 /*
2  *   (c) 2003-2006 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 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, Jacob Shin, and others.
18  *  Originally developed by Paul Devriendt.
19  *  Processor information obtained from Chapter 9 (Power and Thermal Management)
20  *  of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
21  *  Opteron Processors" available for download from www.amd.com
22  *
23  *  Tables for specific CPUs can be inferred from
24  *     http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf
25  */
26
27 #include <linux/kernel.h>
28 #include <linux/smp.h>
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/cpufreq.h>
32 #include <linux/slab.h>
33 #include <linux/string.h>
34 #include <linux/cpumask.h>
35 #include <linux/sched.h>        /* for current / set_cpus_allowed() */
36
37 #include <asm/msr.h>
38 #include <asm/io.h>
39 #include <asm/delay.h>
40
41 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
42 #include <linux/acpi.h>
43 #include <linux/mutex.h>
44 #include <acpi/processor.h>
45 #endif
46
47 #define PFX "powernow-k8: "
48 #define VERSION "version 2.20.00"
49 #include "powernow-k8.h"
50
51 /* serialize freq changes  */
52 static DEFINE_MUTEX(fidvid_mutex);
53
54 static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data);
55
56 static int cpu_family = CPU_OPTERON;
57
58 #ifndef CONFIG_SMP
59 DEFINE_PER_CPU(cpumask_t, cpu_core_map);
60 #endif
61
62 /* Return a frequency in MHz, given an input fid */
63 static u32 find_freq_from_fid(u32 fid)
64 {
65         return 800 + (fid * 100);
66 }
67
68 /* Return a frequency in KHz, given an input fid */
69 static u32 find_khz_freq_from_fid(u32 fid)
70 {
71         return 1000 * find_freq_from_fid(fid);
72 }
73
74 static u32 find_khz_freq_from_pstate(struct cpufreq_frequency_table *data, u32 pstate)
75 {
76         return data[pstate].frequency;
77 }
78
79 /* Return the vco fid for an input fid
80  *
81  * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
82  * only from corresponding high fids. This returns "high" fid corresponding to
83  * "low" one.
84  */
85 static u32 convert_fid_to_vco_fid(u32 fid)
86 {
87         if (fid < HI_FID_TABLE_BOTTOM)
88                 return 8 + (2 * fid);
89         else
90                 return fid;
91 }
92
93 /*
94  * Return 1 if the pending bit is set. Unless we just instructed the processor
95  * to transition to a new state, seeing this bit set is really bad news.
96  */
97 static int pending_bit_stuck(void)
98 {
99         u32 lo, hi;
100
101         if (cpu_family == CPU_HW_PSTATE)
102                 return 0;
103
104         rdmsr(MSR_FIDVID_STATUS, lo, hi);
105         return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
106 }
107
108 /*
109  * Update the global current fid / vid values from the status msr.
110  * Returns 1 on error.
111  */
112 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
113 {
114         u32 lo, hi;
115         u32 i = 0;
116
117         if (cpu_family == CPU_HW_PSTATE) {
118                 rdmsr(MSR_PSTATE_STATUS, lo, hi);
119                 i = lo & HW_PSTATE_MASK;
120                 data->currpstate = i;
121                 return 0;
122         }
123         do {
124                 if (i++ > 10000) {
125                         dprintk("detected change pending stuck\n");
126                         return 1;
127                 }
128                 rdmsr(MSR_FIDVID_STATUS, lo, hi);
129         } while (lo & MSR_S_LO_CHANGE_PENDING);
130
131         data->currvid = hi & MSR_S_HI_CURRENT_VID;
132         data->currfid = lo & MSR_S_LO_CURRENT_FID;
133
134         return 0;
135 }
136
137 /* the isochronous relief time */
138 static void count_off_irt(struct powernow_k8_data *data)
139 {
140         udelay((1 << data->irt) * 10);
141         return;
142 }
143
144 /* the voltage stabilization time */
145 static void count_off_vst(struct powernow_k8_data *data)
146 {
147         udelay(data->vstable * VST_UNITS_20US);
148         return;
149 }
150
151 /* need to init the control msr to a safe value (for each cpu) */
152 static void fidvid_msr_init(void)
153 {
154         u32 lo, hi;
155         u8 fid, vid;
156
157         rdmsr(MSR_FIDVID_STATUS, lo, hi);
158         vid = hi & MSR_S_HI_CURRENT_VID;
159         fid = lo & MSR_S_LO_CURRENT_FID;
160         lo = fid | (vid << MSR_C_LO_VID_SHIFT);
161         hi = MSR_C_HI_STP_GNT_BENIGN;
162         dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
163         wrmsr(MSR_FIDVID_CTL, lo, hi);
164 }
165
166 /* write the new fid value along with the other control fields to the msr */
167 static int write_new_fid(struct powernow_k8_data *data, u32 fid)
168 {
169         u32 lo;
170         u32 savevid = data->currvid;
171         u32 i = 0;
172
173         if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
174                 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
175                 return 1;
176         }
177
178         lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
179
180         dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
181                 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
182
183         do {
184                 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
185                 if (i++ > 100) {
186                         printk(KERN_ERR PFX "Hardware error - pending bit very stuck - no further pstate changes possible\n");
187                         return 1;
188                 }
189         } while (query_current_values_with_pending_wait(data));
190
191         count_off_irt(data);
192
193         if (savevid != data->currvid) {
194                 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
195                        savevid, data->currvid);
196                 return 1;
197         }
198
199         if (fid != data->currfid) {
200                 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
201                         data->currfid);
202                 return 1;
203         }
204
205         return 0;
206 }
207
208 /* Write a new vid to the hardware */
209 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
210 {
211         u32 lo;
212         u32 savefid = data->currfid;
213         int i = 0;
214
215         if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
216                 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
217                 return 1;
218         }
219
220         lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
221
222         dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
223                 vid, lo, STOP_GRANT_5NS);
224
225         do {
226                 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
227                 if (i++ > 100) {
228                         printk(KERN_ERR PFX "internal error - pending bit very stuck - no further pstate changes possible\n");
229                         return 1;
230                 }
231         } while (query_current_values_with_pending_wait(data));
232
233         if (savefid != data->currfid) {
234                 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
235                        savefid, data->currfid);
236                 return 1;
237         }
238
239         if (vid != data->currvid) {
240                 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
241                                 data->currvid);
242                 return 1;
243         }
244
245         return 0;
246 }
247
248 /*
249  * Reduce the vid by the max of step or reqvid.
250  * Decreasing vid codes represent increasing voltages:
251  * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
252  */
253 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
254 {
255         if ((data->currvid - reqvid) > step)
256                 reqvid = data->currvid - step;
257
258         if (write_new_vid(data, reqvid))
259                 return 1;
260
261         count_off_vst(data);
262
263         return 0;
264 }
265
266 /* Change hardware pstate by single MSR write */
267 static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
268 {
269         wrmsr(MSR_PSTATE_CTRL, pstate, 0);
270         data->currpstate = pstate;
271         return 0;
272 }
273
274 /* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
275 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
276 {
277         if (core_voltage_pre_transition(data, reqvid))
278                 return 1;
279
280         if (core_frequency_transition(data, reqfid))
281                 return 1;
282
283         if (core_voltage_post_transition(data, reqvid))
284                 return 1;
285
286         if (query_current_values_with_pending_wait(data))
287                 return 1;
288
289         if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
290                 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
291                                 smp_processor_id(),
292                                 reqfid, reqvid, data->currfid, data->currvid);
293                 return 1;
294         }
295
296         dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
297                 smp_processor_id(), data->currfid, data->currvid);
298
299         return 0;
300 }
301
302 /* Phase 1 - core voltage transition ... setup voltage */
303 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
304 {
305         u32 rvosteps = data->rvo;
306         u32 savefid = data->currfid;
307         u32 maxvid, lo;
308
309         dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
310                 smp_processor_id(),
311                 data->currfid, data->currvid, reqvid, data->rvo);
312
313         rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
314         maxvid = 0x1f & (maxvid >> 16);
315         dprintk("ph1 maxvid=0x%x\n", maxvid);
316         if (reqvid < maxvid) /* lower numbers are higher voltages */
317                 reqvid = maxvid;
318
319         while (data->currvid > reqvid) {
320                 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
321                         data->currvid, reqvid);
322                 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
323                         return 1;
324         }
325
326         while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
327                 if (data->currvid == maxvid) {
328                         rvosteps = 0;
329                 } else {
330                         dprintk("ph1: changing vid for rvo, req 0x%x\n",
331                                 data->currvid - 1);
332                         if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
333                                 return 1;
334                         rvosteps--;
335                 }
336         }
337
338         if (query_current_values_with_pending_wait(data))
339                 return 1;
340
341         if (savefid != data->currfid) {
342                 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
343                 return 1;
344         }
345
346         dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
347                 data->currfid, data->currvid);
348
349         return 0;
350 }
351
352 /* Phase 2 - core frequency transition */
353 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
354 {
355         u32 vcoreqfid, vcocurrfid, vcofiddiff, fid_interval, savevid = data->currvid;
356
357         if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
358                 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
359                         reqfid, data->currfid);
360                 return 1;
361         }
362
363         if (data->currfid == reqfid) {
364                 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
365                 return 0;
366         }
367
368         dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
369                 smp_processor_id(),
370                 data->currfid, data->currvid, reqfid);
371
372         vcoreqfid = convert_fid_to_vco_fid(reqfid);
373         vcocurrfid = convert_fid_to_vco_fid(data->currfid);
374         vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
375             : vcoreqfid - vcocurrfid;
376
377         while (vcofiddiff > 2) {
378                 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
379
380                 if (reqfid > data->currfid) {
381                         if (data->currfid > LO_FID_TABLE_TOP) {
382                                 if (write_new_fid(data, data->currfid + fid_interval)) {
383                                         return 1;
384                                 }
385                         } else {
386                                 if (write_new_fid
387                                     (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
388                                         return 1;
389                                 }
390                         }
391                 } else {
392                         if (write_new_fid(data, data->currfid - fid_interval))
393                                 return 1;
394                 }
395
396                 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
397                 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
398                     : vcoreqfid - vcocurrfid;
399         }
400
401         if (write_new_fid(data, reqfid))
402                 return 1;
403
404         if (query_current_values_with_pending_wait(data))
405                 return 1;
406
407         if (data->currfid != reqfid) {
408                 printk(KERN_ERR PFX
409                         "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
410                         data->currfid, reqfid);
411                 return 1;
412         }
413
414         if (savevid != data->currvid) {
415                 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
416                         savevid, data->currvid);
417                 return 1;
418         }
419
420         dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
421                 data->currfid, data->currvid);
422
423         return 0;
424 }
425
426 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
427 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
428 {
429         u32 savefid = data->currfid;
430         u32 savereqvid = reqvid;
431
432         dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
433                 smp_processor_id(),
434                 data->currfid, data->currvid);
435
436         if (reqvid != data->currvid) {
437                 if (write_new_vid(data, reqvid))
438                         return 1;
439
440                 if (savefid != data->currfid) {
441                         printk(KERN_ERR PFX
442                                "ph3: bad fid change, save 0x%x, curr 0x%x\n",
443                                savefid, data->currfid);
444                         return 1;
445                 }
446
447                 if (data->currvid != reqvid) {
448                         printk(KERN_ERR PFX
449                                "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
450                                reqvid, data->currvid);
451                         return 1;
452                 }
453         }
454
455         if (query_current_values_with_pending_wait(data))
456                 return 1;
457
458         if (savereqvid != data->currvid) {
459                 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
460                 return 1;
461         }
462
463         if (savefid != data->currfid) {
464                 dprintk("ph3 failed, currfid changed 0x%x\n",
465                         data->currfid);
466                 return 1;
467         }
468
469         dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
470                 data->currfid, data->currvid);
471
472         return 0;
473 }
474
475 static int check_supported_cpu(unsigned int cpu)
476 {
477         cpumask_t oldmask;
478         u32 eax, ebx, ecx, edx;
479         unsigned int rc = 0;
480
481         oldmask = current->cpus_allowed;
482         set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
483
484         if (smp_processor_id() != cpu) {
485                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", cpu);
486                 goto out;
487         }
488
489         if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
490                 goto out;
491
492         eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
493         if (((eax & CPUID_XFAM) != CPUID_XFAM_K8) &&
494             ((eax & CPUID_XFAM) < CPUID_XFAM_10H))
495                 goto out;
496
497         if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
498                 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
499                     ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
500                         printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
501                         goto out;
502                 }
503
504                 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
505                 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
506                         printk(KERN_INFO PFX
507                                "No frequency change capabilities detected\n");
508                         goto out;
509                 }
510
511                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
512                 if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
513                         printk(KERN_INFO PFX "Power state transitions not supported\n");
514                         goto out;
515                 }
516         } else { /* must be a HW Pstate capable processor */
517                 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
518                 if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE)
519                         cpu_family = CPU_HW_PSTATE;
520                 else
521                         goto out;
522         }
523
524         rc = 1;
525
526 out:
527         set_cpus_allowed_ptr(current, &oldmask);
528         return rc;
529 }
530
531 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
532 {
533         unsigned int j;
534         u8 lastfid = 0xff;
535
536         for (j = 0; j < data->numps; j++) {
537                 if (pst[j].vid > LEAST_VID) {
538                         printk(KERN_ERR FW_BUG PFX "vid %d invalid : 0x%x\n",
539                                j, pst[j].vid);
540                         return -EINVAL;
541                 }
542                 if (pst[j].vid < data->rvo) {   /* vid + rvo >= 0 */
543                         printk(KERN_ERR FW_BUG PFX "0 vid exceeded with pstate"
544                                " %d\n", j);
545                         return -ENODEV;
546                 }
547                 if (pst[j].vid < maxvid + data->rvo) {  /* vid + rvo >= maxvid */
548                         printk(KERN_ERR FW_BUG PFX "maxvid exceeded with pstate"
549                                " %d\n", j);
550                         return -ENODEV;
551                 }
552                 if (pst[j].fid > MAX_FID) {
553                         printk(KERN_ERR FW_BUG PFX "maxfid exceeded with pstate"
554                                " %d\n", j);
555                         return -ENODEV;
556                 }
557                 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
558                         /* Only first fid is allowed to be in "low" range */
559                         printk(KERN_ERR FW_BUG PFX "two low fids - %d : "
560                                "0x%x\n", j, pst[j].fid);
561                         return -EINVAL;
562                 }
563                 if (pst[j].fid < lastfid)
564                         lastfid = pst[j].fid;
565         }
566         if (lastfid & 1) {
567                 printk(KERN_ERR FW_BUG PFX "lastfid invalid\n");
568                 return -EINVAL;
569         }
570         if (lastfid > LO_FID_TABLE_TOP)
571                 printk(KERN_INFO FW_BUG PFX  "first fid not from lo freq table\n");
572
573         return 0;
574 }
575
576 static void print_basics(struct powernow_k8_data *data)
577 {
578         int j;
579         for (j = 0; j < data->numps; j++) {
580                 if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID) {
581                         if (cpu_family == CPU_HW_PSTATE) {
582                                 printk(KERN_INFO PFX "   %d : pstate %d (%d MHz)\n",
583                                         j,
584                                         data->powernow_table[j].index,
585                                         data->powernow_table[j].frequency/1000);
586                         } else {
587                                 printk(KERN_INFO PFX "   %d : fid 0x%x (%d MHz), vid 0x%x\n",
588                                         j,
589                                         data->powernow_table[j].index & 0xff,
590                                         data->powernow_table[j].frequency/1000,
591                                         data->powernow_table[j].index >> 8);
592                         }
593                 }
594         }
595         if (data->batps)
596                 printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
597 }
598
599 static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
600 {
601         struct cpufreq_frequency_table *powernow_table;
602         unsigned int j;
603
604         if (data->batps) {    /* use ACPI support to get full speed on mains power */
605                 printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
606                 data->numps = data->batps;
607         }
608
609         for ( j=1; j<data->numps; j++ ) {
610                 if (pst[j-1].fid >= pst[j].fid) {
611                         printk(KERN_ERR PFX "PST out of sequence\n");
612                         return -EINVAL;
613                 }
614         }
615
616         if (data->numps < 2) {
617                 printk(KERN_ERR PFX "no p states to transition\n");
618                 return -ENODEV;
619         }
620
621         if (check_pst_table(data, pst, maxvid))
622                 return -EINVAL;
623
624         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
625                 * (data->numps + 1)), GFP_KERNEL);
626         if (!powernow_table) {
627                 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
628                 return -ENOMEM;
629         }
630
631         for (j = 0; j < data->numps; j++) {
632                 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
633                 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
634                 powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
635         }
636         powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
637         powernow_table[data->numps].index = 0;
638
639         if (query_current_values_with_pending_wait(data)) {
640                 kfree(powernow_table);
641                 return -EIO;
642         }
643
644         dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
645         data->powernow_table = powernow_table;
646         if (first_cpu(per_cpu(cpu_core_map, data->cpu)) == data->cpu)
647                 print_basics(data);
648
649         for (j = 0; j < data->numps; j++)
650                 if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
651                         return 0;
652
653         dprintk("currfid/vid do not match PST, ignoring\n");
654         return 0;
655 }
656
657 /* Find and validate the PSB/PST table in BIOS. */
658 static int find_psb_table(struct powernow_k8_data *data)
659 {
660         struct psb_s *psb;
661         unsigned int i;
662         u32 mvs;
663         u8 maxvid;
664         u32 cpst = 0;
665         u32 thiscpuid;
666
667         for (i = 0xc0000; i < 0xffff0; i += 0x10) {
668                 /* Scan BIOS looking for the signature. */
669                 /* It can not be at ffff0 - it is too big. */
670
671                 psb = phys_to_virt(i);
672                 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
673                         continue;
674
675                 dprintk("found PSB header at 0x%p\n", psb);
676
677                 dprintk("table vers: 0x%x\n", psb->tableversion);
678                 if (psb->tableversion != PSB_VERSION_1_4) {
679                         printk(KERN_ERR FW_BUG PFX "PSB table is not v1.4\n");
680                         return -ENODEV;
681                 }
682
683                 dprintk("flags: 0x%x\n", psb->flags1);
684                 if (psb->flags1) {
685                         printk(KERN_ERR FW_BUG PFX "unknown flags\n");
686                         return -ENODEV;
687                 }
688
689                 data->vstable = psb->vstable;
690                 dprintk("voltage stabilization time: %d(*20us)\n", data->vstable);
691
692                 dprintk("flags2: 0x%x\n", psb->flags2);
693                 data->rvo = psb->flags2 & 3;
694                 data->irt = ((psb->flags2) >> 2) & 3;
695                 mvs = ((psb->flags2) >> 4) & 3;
696                 data->vidmvs = 1 << mvs;
697                 data->batps = ((psb->flags2) >> 6) & 3;
698
699                 dprintk("ramp voltage offset: %d\n", data->rvo);
700                 dprintk("isochronous relief time: %d\n", data->irt);
701                 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
702
703                 dprintk("numpst: 0x%x\n", psb->num_tables);
704                 cpst = psb->num_tables;
705                 if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){
706                         thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
707                         if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) {
708                                 cpst = 1;
709                         }
710                 }
711                 if (cpst != 1) {
712                         printk(KERN_ERR FW_BUG PFX "numpst must be 1\n");
713                         return -ENODEV;
714                 }
715
716                 data->plllock = psb->plllocktime;
717                 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
718                 dprintk("maxfid: 0x%x\n", psb->maxfid);
719                 dprintk("maxvid: 0x%x\n", psb->maxvid);
720                 maxvid = psb->maxvid;
721
722                 data->numps = psb->numps;
723                 dprintk("numpstates: 0x%x\n", data->numps);
724                 return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
725         }
726         /*
727          * If you see this message, complain to BIOS manufacturer. If
728          * he tells you "we do not support Linux" or some similar
729          * nonsense, remember that Windows 2000 uses the same legacy
730          * mechanism that the old Linux PSB driver uses. Tell them it
731          * is broken with Windows 2000.
732          *
733          * The reference to the AMD documentation is chapter 9 in the
734          * BIOS and Kernel Developer's Guide, which is available on
735          * www.amd.com
736          */
737         printk(KERN_ERR PFX "BIOS error - no PSB or ACPI _PSS objects\n");
738         return -ENODEV;
739 }
740
741 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
742 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
743 {
744         if (!data->acpi_data.state_count || (cpu_family == CPU_HW_PSTATE))
745                 return;
746
747         data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
748         data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
749         data->exttype = (data->acpi_data.states[index].control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
750         data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
751         data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
752         data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
753 }
754
755 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
756 {
757         struct cpufreq_frequency_table *powernow_table;
758         int ret_val;
759
760         if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
761                 dprintk("register performance failed: bad ACPI data\n");
762                 return -EIO;
763         }
764
765         /* verify the data contained in the ACPI structures */
766         if (data->acpi_data.state_count <= 1) {
767                 dprintk("No ACPI P-States\n");
768                 goto err_out;
769         }
770
771         if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
772                 (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
773                 dprintk("Invalid control/status registers (%x - %x)\n",
774                         data->acpi_data.control_register.space_id,
775                         data->acpi_data.status_register.space_id);
776                 goto err_out;
777         }
778
779         /* fill in data->powernow_table */
780         powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
781                 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
782         if (!powernow_table) {
783                 dprintk("powernow_table memory alloc failure\n");
784                 goto err_out;
785         }
786
787         if (cpu_family == CPU_HW_PSTATE)
788                 ret_val = fill_powernow_table_pstate(data, powernow_table);
789         else
790                 ret_val = fill_powernow_table_fidvid(data, powernow_table);
791         if (ret_val)
792                 goto err_out_mem;
793
794         powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
795         powernow_table[data->acpi_data.state_count].index = 0;
796         data->powernow_table = powernow_table;
797
798         /* fill in data */
799         data->numps = data->acpi_data.state_count;
800         if (first_cpu(per_cpu(cpu_core_map, data->cpu)) == data->cpu)
801                 print_basics(data);
802         powernow_k8_acpi_pst_values(data, 0);
803
804         /* notify BIOS that we exist */
805         acpi_processor_notify_smm(THIS_MODULE);
806
807         return 0;
808
809 err_out_mem:
810         kfree(powernow_table);
811
812 err_out:
813         acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
814
815         /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
816         data->acpi_data.state_count = 0;
817
818         return -ENODEV;
819 }
820
821 static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
822 {
823         int i;
824         u32 hi = 0, lo = 0;
825         rdmsr(MSR_PSTATE_CUR_LIMIT, hi, lo);
826         data->max_hw_pstate = (hi & HW_PSTATE_MAX_MASK) >> HW_PSTATE_MAX_SHIFT;
827
828         for (i = 0; i < data->acpi_data.state_count; i++) {
829                 u32 index;
830
831                 index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
832                 if (index > data->max_hw_pstate) {
833                         printk(KERN_ERR PFX "invalid pstate %d - bad value %d.\n", i, index);
834                         printk(KERN_ERR PFX "Please report to BIOS manufacturer\n");
835                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
836                         continue;
837                 }
838                 rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
839                 if (!(hi & HW_PSTATE_VALID_MASK)) {
840                         dprintk("invalid pstate %d, ignoring\n", index);
841                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
842                         continue;
843                 }
844
845                 powernow_table[i].index = index;
846
847                 powernow_table[i].frequency = data->acpi_data.states[i].core_frequency * 1000;
848         }
849         return 0;
850 }
851
852 static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table)
853 {
854         int i;
855         int cntlofreq = 0;
856         for (i = 0; i < data->acpi_data.state_count; i++) {
857                 u32 fid;
858                 u32 vid;
859
860                 if (data->exttype) {
861                         fid = data->acpi_data.states[i].status & EXT_FID_MASK;
862                         vid = (data->acpi_data.states[i].status >> VID_SHIFT) & EXT_VID_MASK;
863                 } else {
864                         fid = data->acpi_data.states[i].control & FID_MASK;
865                         vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
866                 }
867
868                 dprintk("   %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
869
870                 powernow_table[i].index = fid; /* lower 8 bits */
871                 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
872                 powernow_table[i].frequency = find_khz_freq_from_fid(fid);
873
874                 /* verify frequency is OK */
875                 if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
876                         (powernow_table[i].frequency < (MIN_FREQ * 1000))) {
877                         dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
878                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
879                         continue;
880                 }
881
882                 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
883                 if (vid == VID_OFF) {
884                         dprintk("invalid vid %u, ignoring\n", vid);
885                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
886                         continue;
887                 }
888
889                 /* verify only 1 entry from the lo frequency table */
890                 if (fid < HI_FID_TABLE_BOTTOM) {
891                         if (cntlofreq) {
892                                 /* if both entries are the same, ignore this one ... */
893                                 if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
894                                     (powernow_table[i].index != powernow_table[cntlofreq].index)) {
895                                         printk(KERN_ERR PFX "Too many lo freq table entries\n");
896                                         return 1;
897                                 }
898
899                                 dprintk("double low frequency table entry, ignoring it.\n");
900                                 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
901                                 continue;
902                         } else
903                                 cntlofreq = i;
904                 }
905
906                 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
907                         printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
908                                 powernow_table[i].frequency,
909                                 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
910                         powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
911                         continue;
912                 }
913         }
914         return 0;
915 }
916
917 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
918 {
919         if (data->acpi_data.state_count)
920                 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
921 }
922
923 #else
924 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
925 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
926 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
927 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
928
929 /* Take a frequency, and issue the fid/vid transition command */
930 static int transition_frequency_fidvid(struct powernow_k8_data *data, unsigned int index)
931 {
932         u32 fid = 0;
933         u32 vid = 0;
934         int res, i;
935         struct cpufreq_freqs freqs;
936
937         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
938
939         /* fid/vid correctness check for k8 */
940         /* fid are the lower 8 bits of the index we stored into
941          * the cpufreq frequency table in find_psb_table, vid
942          * are the upper 8 bits.
943          */
944         fid = data->powernow_table[index].index & 0xFF;
945         vid = (data->powernow_table[index].index & 0xFF00) >> 8;
946
947         dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
948
949         if (query_current_values_with_pending_wait(data))
950                 return 1;
951
952         if ((data->currvid == vid) && (data->currfid == fid)) {
953                 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
954                         fid, vid);
955                 return 0;
956         }
957
958         if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
959                 printk(KERN_ERR PFX
960                        "ignoring illegal change in lo freq table-%x to 0x%x\n",
961                        data->currfid, fid);
962                 return 1;
963         }
964
965         dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
966                 smp_processor_id(), fid, vid);
967         freqs.old = find_khz_freq_from_fid(data->currfid);
968         freqs.new = find_khz_freq_from_fid(fid);
969
970         for_each_cpu_mask_nr(i, *(data->available_cores)) {
971                 freqs.cpu = i;
972                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
973         }
974
975         res = transition_fid_vid(data, fid, vid);
976         freqs.new = find_khz_freq_from_fid(data->currfid);
977
978         for_each_cpu_mask_nr(i, *(data->available_cores)) {
979                 freqs.cpu = i;
980                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
981         }
982         return res;
983 }
984
985 /* Take a frequency, and issue the hardware pstate transition command */
986 static int transition_frequency_pstate(struct powernow_k8_data *data, unsigned int index)
987 {
988         u32 pstate = 0;
989         int res, i;
990         struct cpufreq_freqs freqs;
991
992         dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
993
994         /* get MSR index for hardware pstate transition */
995         pstate = index & HW_PSTATE_MASK;
996         if (pstate > data->max_hw_pstate)
997                 return 0;
998         freqs.old = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
999         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1000
1001         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1002                 freqs.cpu = i;
1003                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
1004         }
1005
1006         res = transition_pstate(data, pstate);
1007         freqs.new = find_khz_freq_from_pstate(data->powernow_table, pstate);
1008
1009         for_each_cpu_mask_nr(i, *(data->available_cores)) {
1010                 freqs.cpu = i;
1011                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
1012         }
1013         return res;
1014 }
1015
1016 /* Driver entry point to switch to the target frequency */
1017 static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation)
1018 {
1019         cpumask_t oldmask;
1020         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1021         u32 checkfid;
1022         u32 checkvid;
1023         unsigned int newstate;
1024         int ret = -EIO;
1025
1026         if (!data)
1027                 return -EINVAL;
1028
1029         checkfid = data->currfid;
1030         checkvid = data->currvid;
1031
1032         /* only run on specific CPU from here on */
1033         oldmask = current->cpus_allowed;
1034         set_cpus_allowed_ptr(current, &cpumask_of_cpu(pol->cpu));
1035
1036         if (smp_processor_id() != pol->cpu) {
1037                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1038                 goto err_out;
1039         }
1040
1041         if (pending_bit_stuck()) {
1042                 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
1043                 goto err_out;
1044         }
1045
1046         dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
1047                 pol->cpu, targfreq, pol->min, pol->max, relation);
1048
1049         if (query_current_values_with_pending_wait(data))
1050                 goto err_out;
1051
1052         if (cpu_family != CPU_HW_PSTATE) {
1053                 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
1054                 data->currfid, data->currvid);
1055
1056                 if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
1057                         printk(KERN_INFO PFX
1058                                 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
1059                                 checkfid, data->currfid, checkvid, data->currvid);
1060                 }
1061         }
1062
1063         if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
1064                 goto err_out;
1065
1066         mutex_lock(&fidvid_mutex);
1067
1068         powernow_k8_acpi_pst_values(data, newstate);
1069
1070         if (cpu_family == CPU_HW_PSTATE)
1071                 ret = transition_frequency_pstate(data, newstate);
1072         else
1073                 ret = transition_frequency_fidvid(data, newstate);
1074         if (ret) {
1075                 printk(KERN_ERR PFX "transition frequency failed\n");
1076                 ret = 1;
1077                 mutex_unlock(&fidvid_mutex);
1078                 goto err_out;
1079         }
1080         mutex_unlock(&fidvid_mutex);
1081
1082         if (cpu_family == CPU_HW_PSTATE)
1083                 pol->cur = find_khz_freq_from_pstate(data->powernow_table, newstate);
1084         else
1085                 pol->cur = find_khz_freq_from_fid(data->currfid);
1086         ret = 0;
1087
1088 err_out:
1089         set_cpus_allowed_ptr(current, &oldmask);
1090         return ret;
1091 }
1092
1093 /* Driver entry point to verify the policy and range of frequencies */
1094 static int powernowk8_verify(struct cpufreq_policy *pol)
1095 {
1096         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1097
1098         if (!data)
1099                 return -EINVAL;
1100
1101         return cpufreq_frequency_table_verify(pol, data->powernow_table);
1102 }
1103
1104 /* per CPU init entry point to the driver */
1105 static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
1106 {
1107         struct powernow_k8_data *data;
1108         cpumask_t oldmask;
1109         int rc;
1110
1111         if (!cpu_online(pol->cpu))
1112                 return -ENODEV;
1113
1114         if (!check_supported_cpu(pol->cpu))
1115                 return -ENODEV;
1116
1117         data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
1118         if (!data) {
1119                 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1120                 return -ENOMEM;
1121         }
1122
1123         data->cpu = pol->cpu;
1124
1125         if (powernow_k8_cpu_init_acpi(data)) {
1126                 /*
1127                  * Use the PSB BIOS structure. This is only availabe on
1128                  * an UP version, and is deprecated by AMD.
1129                  */
1130                 if (num_online_cpus() != 1) {
1131 #ifndef CONFIG_ACPI_PROCESSOR
1132                         printk(KERN_ERR PFX "ACPI Processor support is required "
1133                                "for SMP systems but is absent. Please load the "
1134                                "ACPI Processor module before starting this "
1135                                "driver.\n");
1136 #else
1137                         printk(KERN_ERR FW_BUG PFX "Your BIOS does not provide"
1138                                " ACPI _PSS objects in a way that Linux "
1139                                "understands. Please report this to the Linux "
1140                                "ACPI maintainers and complain to your BIOS "
1141                                "vendor.\n");
1142 #endif
1143                         kfree(data);
1144                         return -ENODEV;
1145                 }
1146                 if (pol->cpu != 0) {
1147                         printk(KERN_ERR FW_BUG PFX "No ACPI _PSS objects for "
1148                                "CPU other than CPU0. Complain to your BIOS "
1149                                "vendor.\n");
1150                         kfree(data);
1151                         return -ENODEV;
1152                 }
1153                 rc = find_psb_table(data);
1154                 if (rc) {
1155                         kfree(data);
1156                         return -ENODEV;
1157                 }
1158         }
1159
1160         /* only run on specific CPU from here on */
1161         oldmask = current->cpus_allowed;
1162         set_cpus_allowed_ptr(current, &cpumask_of_cpu(pol->cpu));
1163
1164         if (smp_processor_id() != pol->cpu) {
1165                 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1166                 goto err_out;
1167         }
1168
1169         if (pending_bit_stuck()) {
1170                 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1171                 goto err_out;
1172         }
1173
1174         if (query_current_values_with_pending_wait(data))
1175                 goto err_out;
1176
1177         if (cpu_family == CPU_OPTERON)
1178                 fidvid_msr_init();
1179
1180         /* run on any CPU again */
1181         set_cpus_allowed_ptr(current, &oldmask);
1182
1183         if (cpu_family == CPU_HW_PSTATE)
1184                 pol->cpus = cpumask_of_cpu(pol->cpu);
1185         else
1186                 pol->cpus = per_cpu(cpu_core_map, pol->cpu);
1187         data->available_cores = &(pol->cpus);
1188
1189         /* Take a crude guess here.
1190          * That guess was in microseconds, so multiply with 1000 */
1191         pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
1192             + (3 * (1 << data->irt) * 10)) * 1000;
1193
1194         if (cpu_family == CPU_HW_PSTATE)
1195                 pol->cur = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
1196         else
1197                 pol->cur = find_khz_freq_from_fid(data->currfid);
1198         dprintk("policy current frequency %d kHz\n", pol->cur);
1199
1200         /* min/max the cpu is capable of */
1201         if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1202                 printk(KERN_ERR FW_BUG PFX "invalid powernow_table\n");
1203                 powernow_k8_cpu_exit_acpi(data);
1204                 kfree(data->powernow_table);
1205                 kfree(data);
1206                 return -EINVAL;
1207         }
1208
1209         cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1210
1211         if (cpu_family == CPU_HW_PSTATE)
1212                 dprintk("cpu_init done, current pstate 0x%x\n", data->currpstate);
1213         else
1214                 dprintk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1215                         data->currfid, data->currvid);
1216
1217         per_cpu(powernow_data, pol->cpu) = data;
1218
1219         return 0;
1220
1221 err_out:
1222         set_cpus_allowed_ptr(current, &oldmask);
1223         powernow_k8_cpu_exit_acpi(data);
1224
1225         kfree(data);
1226         return -ENODEV;
1227 }
1228
1229 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1230 {
1231         struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1232
1233         if (!data)
1234                 return -EINVAL;
1235
1236         powernow_k8_cpu_exit_acpi(data);
1237
1238         cpufreq_frequency_table_put_attr(pol->cpu);
1239
1240         kfree(data->powernow_table);
1241         kfree(data);
1242
1243         return 0;
1244 }
1245
1246 static unsigned int powernowk8_get (unsigned int cpu)
1247 {
1248         struct powernow_k8_data *data;
1249         cpumask_t oldmask = current->cpus_allowed;
1250         unsigned int khz = 0;
1251         unsigned int first;
1252
1253         first = first_cpu(per_cpu(cpu_core_map, cpu));
1254         data = per_cpu(powernow_data, first);
1255
1256         if (!data)
1257                 return -EINVAL;
1258
1259         set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
1260         if (smp_processor_id() != cpu) {
1261                 printk(KERN_ERR PFX
1262                         "limiting to CPU %d failed in powernowk8_get\n", cpu);
1263                 set_cpus_allowed_ptr(current, &oldmask);
1264                 return 0;
1265         }
1266
1267         if (query_current_values_with_pending_wait(data))
1268                 goto out;
1269
1270         if (cpu_family == CPU_HW_PSTATE)
1271                 khz = find_khz_freq_from_pstate(data->powernow_table,
1272                                                 data->currpstate);
1273         else
1274                 khz = find_khz_freq_from_fid(data->currfid);
1275
1276
1277 out:
1278         set_cpus_allowed_ptr(current, &oldmask);
1279         return khz;
1280 }
1281
1282 static struct freq_attr* powernow_k8_attr[] = {
1283         &cpufreq_freq_attr_scaling_available_freqs,
1284         NULL,
1285 };
1286
1287 static struct cpufreq_driver cpufreq_amd64_driver = {
1288         .verify = powernowk8_verify,
1289         .target = powernowk8_target,
1290         .init = powernowk8_cpu_init,
1291         .exit = __devexit_p(powernowk8_cpu_exit),
1292         .get = powernowk8_get,
1293         .name = "powernow-k8",
1294         .owner = THIS_MODULE,
1295         .attr = powernow_k8_attr,
1296 };
1297
1298 /* driver entry point for init */
1299 static int __cpuinit powernowk8_init(void)
1300 {
1301         unsigned int i, supported_cpus = 0;
1302
1303         for_each_online_cpu(i) {
1304                 if (check_supported_cpu(i))
1305                         supported_cpus++;
1306         }
1307
1308         if (supported_cpus == num_online_cpus()) {
1309                 printk(KERN_INFO PFX "Found %d %s "
1310                         "processors (%d cpu cores) (" VERSION ")\n",
1311                         num_online_nodes(),
1312                         boot_cpu_data.x86_model_id, supported_cpus);
1313                 return cpufreq_register_driver(&cpufreq_amd64_driver);
1314         }
1315
1316         return -ENODEV;
1317 }
1318
1319 /* driver entry point for term */
1320 static void __exit powernowk8_exit(void)
1321 {
1322         dprintk("exit\n");
1323
1324         cpufreq_unregister_driver(&cpufreq_amd64_driver);
1325 }
1326
1327 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com>");
1328 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1329 MODULE_LICENSE("GPL");
1330
1331 late_initcall(powernowk8_init);
1332 module_exit(powernowk8_exit);