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
7 * Support : mark.langsdorf@amd.com
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.
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
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
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() */
39 #include <asm/delay.h>
41 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
42 #include <linux/acpi.h>
43 #include <linux/mutex.h>
44 #include <acpi/processor.h>
47 #define PFX "powernow-k8: "
48 #define BFX PFX "BIOS error: "
49 #define VERSION "version 2.00.00"
50 #include "powernow-k8.h"
52 /* serialize freq changes */
53 static DEFINE_MUTEX(fidvid_mutex
);
55 static struct powernow_k8_data
*powernow_data
[NR_CPUS
];
57 static int cpu_family
= CPU_OPTERON
;
60 static cpumask_t cpu_core_map
[1];
63 /* Return a frequency in MHz, given an input fid */
64 static u32
find_freq_from_fid(u32 fid
)
66 return 800 + (fid
* 100);
70 /* Return a frequency in KHz, given an input fid */
71 static u32
find_khz_freq_from_fid(u32 fid
)
73 return 1000 * find_freq_from_fid(fid
);
76 /* Return a frequency in MHz, given an input fid and did */
77 static u32
find_freq_from_fiddid(u32 fid
, u32 did
)
79 if (current_cpu_data
.x86
== 0x10)
80 return 100 * (fid
+ 0x10) >> did
;
82 return 100 * (fid
+ 0x8) >> did
;
85 static u32
find_khz_freq_from_fiddid(u32 fid
, u32 did
)
87 return 1000 * find_freq_from_fiddid(fid
, did
);
90 static u32
find_fid_from_pstate(u32 pstate
)
93 rdmsr(MSR_PSTATE_DEF_BASE
+ pstate
, lo
, hi
);
94 return lo
& HW_PSTATE_FID_MASK
;
97 static u32
find_did_from_pstate(u32 pstate
)
100 rdmsr(MSR_PSTATE_DEF_BASE
+ pstate
, lo
, hi
);
101 return (lo
& HW_PSTATE_DID_MASK
) >> HW_PSTATE_DID_SHIFT
;
104 /* Return the vco fid for an input fid
106 * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
107 * only from corresponding high fids. This returns "high" fid corresponding to
110 static u32
convert_fid_to_vco_fid(u32 fid
)
112 if (fid
< HI_FID_TABLE_BOTTOM
)
113 return 8 + (2 * fid
);
119 * Return 1 if the pending bit is set. Unless we just instructed the processor
120 * to transition to a new state, seeing this bit set is really bad news.
122 static int pending_bit_stuck(void)
126 if (cpu_family
== CPU_HW_PSTATE
)
129 rdmsr(MSR_FIDVID_STATUS
, lo
, hi
);
130 return lo
& MSR_S_LO_CHANGE_PENDING
? 1 : 0;
134 * Update the global current fid / vid values from the status msr.
135 * Returns 1 on error.
137 static int query_current_values_with_pending_wait(struct powernow_k8_data
*data
)
142 if (cpu_family
== CPU_HW_PSTATE
) {
143 rdmsr(MSR_PSTATE_STATUS
, lo
, hi
);
144 i
= lo
& HW_PSTATE_MASK
;
145 rdmsr(MSR_PSTATE_DEF_BASE
+ i
, lo
, hi
);
146 data
->currfid
= lo
& HW_PSTATE_FID_MASK
;
147 data
->currdid
= (lo
& HW_PSTATE_DID_MASK
) >> HW_PSTATE_DID_SHIFT
;
152 dprintk("detected change pending stuck\n");
155 rdmsr(MSR_FIDVID_STATUS
, lo
, hi
);
156 } while (lo
& MSR_S_LO_CHANGE_PENDING
);
158 data
->currvid
= hi
& MSR_S_HI_CURRENT_VID
;
159 data
->currfid
= lo
& MSR_S_LO_CURRENT_FID
;
164 /* the isochronous relief time */
165 static void count_off_irt(struct powernow_k8_data
*data
)
167 udelay((1 << data
->irt
) * 10);
171 /* the voltage stabalization time */
172 static void count_off_vst(struct powernow_k8_data
*data
)
174 udelay(data
->vstable
* VST_UNITS_20US
);
178 /* need to init the control msr to a safe value (for each cpu) */
179 static void fidvid_msr_init(void)
184 rdmsr(MSR_FIDVID_STATUS
, lo
, hi
);
185 vid
= hi
& MSR_S_HI_CURRENT_VID
;
186 fid
= lo
& MSR_S_LO_CURRENT_FID
;
187 lo
= fid
| (vid
<< MSR_C_LO_VID_SHIFT
);
188 hi
= MSR_C_HI_STP_GNT_BENIGN
;
189 dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo
, hi
);
190 wrmsr(MSR_FIDVID_CTL
, lo
, hi
);
194 /* write the new fid value along with the other control fields to the msr */
195 static int write_new_fid(struct powernow_k8_data
*data
, u32 fid
)
198 u32 savevid
= data
->currvid
;
201 if ((fid
& INVALID_FID_MASK
) || (data
->currvid
& INVALID_VID_MASK
)) {
202 printk(KERN_ERR PFX
"internal error - overflow on fid write\n");
206 lo
= fid
| (data
->currvid
<< MSR_C_LO_VID_SHIFT
) | MSR_C_LO_INIT_FID_VID
;
208 dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
209 fid
, lo
, data
->plllock
* PLL_LOCK_CONVERSION
);
212 wrmsr(MSR_FIDVID_CTL
, lo
, data
->plllock
* PLL_LOCK_CONVERSION
);
214 printk(KERN_ERR PFX
"Hardware error - pending bit very stuck - no further pstate changes possible\n");
217 } while (query_current_values_with_pending_wait(data
));
221 if (savevid
!= data
->currvid
) {
222 printk(KERN_ERR PFX
"vid change on fid trans, old 0x%x, new 0x%x\n",
223 savevid
, data
->currvid
);
227 if (fid
!= data
->currfid
) {
228 printk(KERN_ERR PFX
"fid trans failed, fid 0x%x, curr 0x%x\n", fid
,
236 /* Write a new vid to the hardware */
237 static int write_new_vid(struct powernow_k8_data
*data
, u32 vid
)
240 u32 savefid
= data
->currfid
;
243 if ((data
->currfid
& INVALID_FID_MASK
) || (vid
& INVALID_VID_MASK
)) {
244 printk(KERN_ERR PFX
"internal error - overflow on vid write\n");
248 lo
= data
->currfid
| (vid
<< MSR_C_LO_VID_SHIFT
) | MSR_C_LO_INIT_FID_VID
;
250 dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
251 vid
, lo
, STOP_GRANT_5NS
);
254 wrmsr(MSR_FIDVID_CTL
, lo
, STOP_GRANT_5NS
);
256 printk(KERN_ERR PFX
"internal error - pending bit very stuck - no further pstate changes possible\n");
259 } while (query_current_values_with_pending_wait(data
));
261 if (savefid
!= data
->currfid
) {
262 printk(KERN_ERR PFX
"fid changed on vid trans, old 0x%x new 0x%x\n",
263 savefid
, data
->currfid
);
267 if (vid
!= data
->currvid
) {
268 printk(KERN_ERR PFX
"vid trans failed, vid 0x%x, curr 0x%x\n", vid
,
277 * Reduce the vid by the max of step or reqvid.
278 * Decreasing vid codes represent increasing voltages:
279 * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
281 static int decrease_vid_code_by_step(struct powernow_k8_data
*data
, u32 reqvid
, u32 step
)
283 if ((data
->currvid
- reqvid
) > step
)
284 reqvid
= data
->currvid
- step
;
286 if (write_new_vid(data
, reqvid
))
294 /* Change hardware pstate by single MSR write */
295 static int transition_pstate(struct powernow_k8_data
*data
, u32 pstate
)
297 wrmsr(MSR_PSTATE_CTRL
, pstate
, 0);
298 data
->currfid
= find_fid_from_pstate(pstate
);
302 /* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
303 static int transition_fid_vid(struct powernow_k8_data
*data
, u32 reqfid
, u32 reqvid
)
305 if (core_voltage_pre_transition(data
, reqvid
))
308 if (core_frequency_transition(data
, reqfid
))
311 if (core_voltage_post_transition(data
, reqvid
))
314 if (query_current_values_with_pending_wait(data
))
317 if ((reqfid
!= data
->currfid
) || (reqvid
!= data
->currvid
)) {
318 printk(KERN_ERR PFX
"failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
320 reqfid
, reqvid
, data
->currfid
, data
->currvid
);
324 dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
325 smp_processor_id(), data
->currfid
, data
->currvid
);
330 /* Phase 1 - core voltage transition ... setup voltage */
331 static int core_voltage_pre_transition(struct powernow_k8_data
*data
, u32 reqvid
)
333 u32 rvosteps
= data
->rvo
;
334 u32 savefid
= data
->currfid
;
337 dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
339 data
->currfid
, data
->currvid
, reqvid
, data
->rvo
);
341 rdmsr(MSR_FIDVID_STATUS
, lo
, maxvid
);
342 maxvid
= 0x1f & (maxvid
>> 16);
343 dprintk("ph1 maxvid=0x%x\n", maxvid
);
344 if (reqvid
< maxvid
) /* lower numbers are higher voltages */
347 while (data
->currvid
> reqvid
) {
348 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
349 data
->currvid
, reqvid
);
350 if (decrease_vid_code_by_step(data
, reqvid
, data
->vidmvs
))
354 while ((rvosteps
> 0) && ((data
->rvo
+ data
->currvid
) > reqvid
)) {
355 if (data
->currvid
== maxvid
) {
358 dprintk("ph1: changing vid for rvo, req 0x%x\n",
360 if (decrease_vid_code_by_step(data
, data
->currvid
- 1, 1))
366 if (query_current_values_with_pending_wait(data
))
369 if (savefid
!= data
->currfid
) {
370 printk(KERN_ERR PFX
"ph1 err, currfid changed 0x%x\n", data
->currfid
);
374 dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
375 data
->currfid
, data
->currvid
);
380 /* Phase 2 - core frequency transition */
381 static int core_frequency_transition(struct powernow_k8_data
*data
, u32 reqfid
)
383 u32 vcoreqfid
, vcocurrfid
, vcofiddiff
, fid_interval
, savevid
= data
->currvid
;
385 if ((reqfid
< HI_FID_TABLE_BOTTOM
) && (data
->currfid
< HI_FID_TABLE_BOTTOM
)) {
386 printk(KERN_ERR PFX
"ph2: illegal lo-lo transition 0x%x 0x%x\n",
387 reqfid
, data
->currfid
);
391 if (data
->currfid
== reqfid
) {
392 printk(KERN_ERR PFX
"ph2 null fid transition 0x%x\n", data
->currfid
);
396 dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
398 data
->currfid
, data
->currvid
, reqfid
);
400 vcoreqfid
= convert_fid_to_vco_fid(reqfid
);
401 vcocurrfid
= convert_fid_to_vco_fid(data
->currfid
);
402 vcofiddiff
= vcocurrfid
> vcoreqfid
? vcocurrfid
- vcoreqfid
403 : vcoreqfid
- vcocurrfid
;
405 while (vcofiddiff
> 2) {
406 (data
->currfid
& 1) ? (fid_interval
= 1) : (fid_interval
= 2);
408 if (reqfid
> data
->currfid
) {
409 if (data
->currfid
> LO_FID_TABLE_TOP
) {
410 if (write_new_fid(data
, data
->currfid
+ fid_interval
)) {
415 (data
, 2 + convert_fid_to_vco_fid(data
->currfid
))) {
420 if (write_new_fid(data
, data
->currfid
- fid_interval
))
424 vcocurrfid
= convert_fid_to_vco_fid(data
->currfid
);
425 vcofiddiff
= vcocurrfid
> vcoreqfid
? vcocurrfid
- vcoreqfid
426 : vcoreqfid
- vcocurrfid
;
429 if (write_new_fid(data
, reqfid
))
432 if (query_current_values_with_pending_wait(data
))
435 if (data
->currfid
!= reqfid
) {
437 "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
438 data
->currfid
, reqfid
);
442 if (savevid
!= data
->currvid
) {
443 printk(KERN_ERR PFX
"ph2: vid changed, save 0x%x, curr 0x%x\n",
444 savevid
, data
->currvid
);
448 dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
449 data
->currfid
, data
->currvid
);
454 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
455 static int core_voltage_post_transition(struct powernow_k8_data
*data
, u32 reqvid
)
457 u32 savefid
= data
->currfid
;
458 u32 savereqvid
= reqvid
;
460 dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
462 data
->currfid
, data
->currvid
);
464 if (reqvid
!= data
->currvid
) {
465 if (write_new_vid(data
, reqvid
))
468 if (savefid
!= data
->currfid
) {
470 "ph3: bad fid change, save 0x%x, curr 0x%x\n",
471 savefid
, data
->currfid
);
475 if (data
->currvid
!= reqvid
) {
477 "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
478 reqvid
, data
->currvid
);
483 if (query_current_values_with_pending_wait(data
))
486 if (savereqvid
!= data
->currvid
) {
487 dprintk("ph3 failed, currvid 0x%x\n", data
->currvid
);
491 if (savefid
!= data
->currfid
) {
492 dprintk("ph3 failed, currfid changed 0x%x\n",
497 dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
498 data
->currfid
, data
->currvid
);
503 static int check_supported_cpu(unsigned int cpu
)
505 cpumask_t oldmask
= CPU_MASK_ALL
;
506 u32 eax
, ebx
, ecx
, edx
;
509 oldmask
= current
->cpus_allowed
;
510 set_cpus_allowed(current
, cpumask_of_cpu(cpu
));
512 if (smp_processor_id() != cpu
) {
513 printk(KERN_ERR PFX
"limiting to cpu %u failed\n", cpu
);
517 if (current_cpu_data
.x86_vendor
!= X86_VENDOR_AMD
)
520 eax
= cpuid_eax(CPUID_PROCESSOR_SIGNATURE
);
521 if (((eax
& CPUID_XFAM
) != CPUID_XFAM_K8
) &&
522 ((eax
& CPUID_XFAM
) < CPUID_XFAM_10H
))
525 if ((eax
& CPUID_XFAM
) == CPUID_XFAM_K8
) {
526 if (((eax
& CPUID_USE_XFAM_XMOD
) != CPUID_USE_XFAM_XMOD
) ||
527 ((eax
& CPUID_XMOD
) > CPUID_XMOD_REV_MASK
)) {
528 printk(KERN_INFO PFX
"Processor cpuid %x not supported\n", eax
);
532 eax
= cpuid_eax(CPUID_GET_MAX_CAPABILITIES
);
533 if (eax
< CPUID_FREQ_VOLT_CAPABILITIES
) {
535 "No frequency change capabilities detected\n");
539 cpuid(CPUID_FREQ_VOLT_CAPABILITIES
, &eax
, &ebx
, &ecx
, &edx
);
540 if ((edx
& P_STATE_TRANSITION_CAPABLE
) != P_STATE_TRANSITION_CAPABLE
) {
541 printk(KERN_INFO PFX
"Power state transitions not supported\n");
544 } else { /* must be a HW Pstate capable processor */
545 cpuid(CPUID_FREQ_VOLT_CAPABILITIES
, &eax
, &ebx
, &ecx
, &edx
);
546 if ((edx
& USE_HW_PSTATE
) == USE_HW_PSTATE
)
547 cpu_family
= CPU_HW_PSTATE
;
555 set_cpus_allowed(current
, oldmask
);
559 static int check_pst_table(struct powernow_k8_data
*data
, struct pst_s
*pst
, u8 maxvid
)
564 for (j
= 0; j
< data
->numps
; j
++) {
565 if (pst
[j
].vid
> LEAST_VID
) {
566 printk(KERN_ERR PFX
"vid %d invalid : 0x%x\n", j
, pst
[j
].vid
);
569 if (pst
[j
].vid
< data
->rvo
) { /* vid + rvo >= 0 */
570 printk(KERN_ERR BFX
"0 vid exceeded with pstate %d\n", j
);
573 if (pst
[j
].vid
< maxvid
+ data
->rvo
) { /* vid + rvo >= maxvid */
574 printk(KERN_ERR BFX
"maxvid exceeded with pstate %d\n", j
);
577 if (pst
[j
].fid
> MAX_FID
) {
578 printk(KERN_ERR BFX
"maxfid exceeded with pstate %d\n", j
);
581 if (j
&& (pst
[j
].fid
< HI_FID_TABLE_BOTTOM
)) {
582 /* Only first fid is allowed to be in "low" range */
583 printk(KERN_ERR BFX
"two low fids - %d : 0x%x\n", j
, pst
[j
].fid
);
586 if (pst
[j
].fid
< lastfid
)
587 lastfid
= pst
[j
].fid
;
590 printk(KERN_ERR BFX
"lastfid invalid\n");
593 if (lastfid
> LO_FID_TABLE_TOP
)
594 printk(KERN_INFO BFX
"first fid not from lo freq table\n");
599 static void print_basics(struct powernow_k8_data
*data
)
602 for (j
= 0; j
< data
->numps
; j
++) {
603 if (data
->powernow_table
[j
].frequency
!= CPUFREQ_ENTRY_INVALID
) {
604 if (cpu_family
== CPU_HW_PSTATE
) {
605 printk(KERN_INFO PFX
" %d : fid 0x%x did 0x%x (%d MHz)\n",
607 (data
->powernow_table
[j
].index
& 0xff00) >> 8,
608 (data
->powernow_table
[j
].index
& 0xff0000) >> 16,
609 data
->powernow_table
[j
].frequency
/1000);
611 printk(KERN_INFO PFX
" %d : fid 0x%x (%d MHz), vid 0x%x\n",
613 data
->powernow_table
[j
].index
& 0xff,
614 data
->powernow_table
[j
].frequency
/1000,
615 data
->powernow_table
[j
].index
>> 8);
620 printk(KERN_INFO PFX
"Only %d pstates on battery\n", data
->batps
);
623 static int fill_powernow_table(struct powernow_k8_data
*data
, struct pst_s
*pst
, u8 maxvid
)
625 struct cpufreq_frequency_table
*powernow_table
;
628 if (data
->batps
) { /* use ACPI support to get full speed on mains power */
629 printk(KERN_WARNING PFX
"Only %d pstates usable (use ACPI driver for full range\n", data
->batps
);
630 data
->numps
= data
->batps
;
633 for ( j
=1; j
<data
->numps
; j
++ ) {
634 if (pst
[j
-1].fid
>= pst
[j
].fid
) {
635 printk(KERN_ERR PFX
"PST out of sequence\n");
640 if (data
->numps
< 2) {
641 printk(KERN_ERR PFX
"no p states to transition\n");
645 if (check_pst_table(data
, pst
, maxvid
))
648 powernow_table
= kmalloc((sizeof(struct cpufreq_frequency_table
)
649 * (data
->numps
+ 1)), GFP_KERNEL
);
650 if (!powernow_table
) {
651 printk(KERN_ERR PFX
"powernow_table memory alloc failure\n");
655 for (j
= 0; j
< data
->numps
; j
++) {
656 powernow_table
[j
].index
= pst
[j
].fid
; /* lower 8 bits */
657 powernow_table
[j
].index
|= (pst
[j
].vid
<< 8); /* upper 8 bits */
658 powernow_table
[j
].frequency
= find_khz_freq_from_fid(pst
[j
].fid
);
660 powernow_table
[data
->numps
].frequency
= CPUFREQ_TABLE_END
;
661 powernow_table
[data
->numps
].index
= 0;
663 if (query_current_values_with_pending_wait(data
)) {
664 kfree(powernow_table
);
668 dprintk("cfid 0x%x, cvid 0x%x\n", data
->currfid
, data
->currvid
);
669 data
->powernow_table
= powernow_table
;
670 if (first_cpu(cpu_core_map
[data
->cpu
]) == data
->cpu
)
673 for (j
= 0; j
< data
->numps
; j
++)
674 if ((pst
[j
].fid
==data
->currfid
) && (pst
[j
].vid
==data
->currvid
))
677 dprintk("currfid/vid do not match PST, ignoring\n");
681 /* Find and validate the PSB/PST table in BIOS. */
682 static int find_psb_table(struct powernow_k8_data
*data
)
691 for (i
= 0xc0000; i
< 0xffff0; i
+= 0x10) {
692 /* Scan BIOS looking for the signature. */
693 /* It can not be at ffff0 - it is too big. */
695 psb
= phys_to_virt(i
);
696 if (memcmp(psb
, PSB_ID_STRING
, PSB_ID_STRING_LEN
) != 0)
699 dprintk("found PSB header at 0x%p\n", psb
);
701 dprintk("table vers: 0x%x\n", psb
->tableversion
);
702 if (psb
->tableversion
!= PSB_VERSION_1_4
) {
703 printk(KERN_ERR BFX
"PSB table is not v1.4\n");
707 dprintk("flags: 0x%x\n", psb
->flags1
);
709 printk(KERN_ERR BFX
"unknown flags\n");
713 data
->vstable
= psb
->vstable
;
714 dprintk("voltage stabilization time: %d(*20us)\n", data
->vstable
);
716 dprintk("flags2: 0x%x\n", psb
->flags2
);
717 data
->rvo
= psb
->flags2
& 3;
718 data
->irt
= ((psb
->flags2
) >> 2) & 3;
719 mvs
= ((psb
->flags2
) >> 4) & 3;
720 data
->vidmvs
= 1 << mvs
;
721 data
->batps
= ((psb
->flags2
) >> 6) & 3;
723 dprintk("ramp voltage offset: %d\n", data
->rvo
);
724 dprintk("isochronous relief time: %d\n", data
->irt
);
725 dprintk("maximum voltage step: %d - 0x%x\n", mvs
, data
->vidmvs
);
727 dprintk("numpst: 0x%x\n", psb
->num_tables
);
728 cpst
= psb
->num_tables
;
729 if ((psb
->cpuid
== 0x00000fc0) || (psb
->cpuid
== 0x00000fe0) ){
730 thiscpuid
= cpuid_eax(CPUID_PROCESSOR_SIGNATURE
);
731 if ((thiscpuid
== 0x00000fc0) || (thiscpuid
== 0x00000fe0) ) {
736 printk(KERN_ERR BFX
"numpst must be 1\n");
740 data
->plllock
= psb
->plllocktime
;
741 dprintk("plllocktime: 0x%x (units 1us)\n", psb
->plllocktime
);
742 dprintk("maxfid: 0x%x\n", psb
->maxfid
);
743 dprintk("maxvid: 0x%x\n", psb
->maxvid
);
744 maxvid
= psb
->maxvid
;
746 data
->numps
= psb
->numps
;
747 dprintk("numpstates: 0x%x\n", data
->numps
);
748 return fill_powernow_table(data
, (struct pst_s
*)(psb
+1), maxvid
);
751 * If you see this message, complain to BIOS manufacturer. If
752 * he tells you "we do not support Linux" or some similar
753 * nonsense, remember that Windows 2000 uses the same legacy
754 * mechanism that the old Linux PSB driver uses. Tell them it
755 * is broken with Windows 2000.
757 * The reference to the AMD documentation is chapter 9 in the
758 * BIOS and Kernel Developer's Guide, which is available on
761 printk(KERN_ERR PFX
"BIOS error - no PSB or ACPI _PSS objects\n");
765 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
766 static void powernow_k8_acpi_pst_values(struct powernow_k8_data
*data
, unsigned int index
)
768 if (!data
->acpi_data
.state_count
|| (cpu_family
== CPU_HW_PSTATE
))
771 data
->irt
= (data
->acpi_data
.states
[index
].control
>> IRT_SHIFT
) & IRT_MASK
;
772 data
->rvo
= (data
->acpi_data
.states
[index
].control
>> RVO_SHIFT
) & RVO_MASK
;
773 data
->exttype
= (data
->acpi_data
.states
[index
].control
>> EXT_TYPE_SHIFT
) & EXT_TYPE_MASK
;
774 data
->plllock
= (data
->acpi_data
.states
[index
].control
>> PLL_L_SHIFT
) & PLL_L_MASK
;
775 data
->vidmvs
= 1 << ((data
->acpi_data
.states
[index
].control
>> MVS_SHIFT
) & MVS_MASK
);
776 data
->vstable
= (data
->acpi_data
.states
[index
].control
>> VST_SHIFT
) & VST_MASK
;
779 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data
*data
)
781 struct cpufreq_frequency_table
*powernow_table
;
784 if (acpi_processor_register_performance(&data
->acpi_data
, data
->cpu
)) {
785 dprintk("register performance failed: bad ACPI data\n");
789 /* verify the data contained in the ACPI structures */
790 if (data
->acpi_data
.state_count
<= 1) {
791 dprintk("No ACPI P-States\n");
795 if ((data
->acpi_data
.control_register
.space_id
!= ACPI_ADR_SPACE_FIXED_HARDWARE
) ||
796 (data
->acpi_data
.status_register
.space_id
!= ACPI_ADR_SPACE_FIXED_HARDWARE
)) {
797 dprintk("Invalid control/status registers (%x - %x)\n",
798 data
->acpi_data
.control_register
.space_id
,
799 data
->acpi_data
.status_register
.space_id
);
803 /* fill in data->powernow_table */
804 powernow_table
= kmalloc((sizeof(struct cpufreq_frequency_table
)
805 * (data
->acpi_data
.state_count
+ 1)), GFP_KERNEL
);
806 if (!powernow_table
) {
807 dprintk("powernow_table memory alloc failure\n");
811 if (cpu_family
== CPU_HW_PSTATE
)
812 ret_val
= fill_powernow_table_pstate(data
, powernow_table
);
814 ret_val
= fill_powernow_table_fidvid(data
, powernow_table
);
818 powernow_table
[data
->acpi_data
.state_count
].frequency
= CPUFREQ_TABLE_END
;
819 powernow_table
[data
->acpi_data
.state_count
].index
= 0;
820 data
->powernow_table
= powernow_table
;
823 data
->numps
= data
->acpi_data
.state_count
;
824 if (first_cpu(cpu_core_map
[data
->cpu
]) == data
->cpu
)
826 powernow_k8_acpi_pst_values(data
, 0);
828 /* notify BIOS that we exist */
829 acpi_processor_notify_smm(THIS_MODULE
);
834 kfree(powernow_table
);
837 acpi_processor_unregister_performance(&data
->acpi_data
, data
->cpu
);
839 /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
840 data
->acpi_data
.state_count
= 0;
845 static int fill_powernow_table_pstate(struct powernow_k8_data
*data
, struct cpufreq_frequency_table
*powernow_table
)
849 for (i
= 0; i
< data
->acpi_data
.state_count
; i
++) {
855 index
= data
->acpi_data
.states
[i
].control
& HW_PSTATE_MASK
;
856 if (index
> MAX_HW_PSTATE
) {
857 printk(KERN_ERR PFX
"invalid pstate %d - bad value %d.\n", i
, index
);
858 printk(KERN_ERR PFX
"Please report to BIOS manufacturer\n");
860 rdmsr(MSR_PSTATE_DEF_BASE
+ index
, lo
, hi
);
861 if (!(hi
& HW_PSTATE_VALID_MASK
)) {
862 dprintk("invalid pstate %d, ignoring\n", index
);
863 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
867 fid
= lo
& HW_PSTATE_FID_MASK
;
868 did
= (lo
& HW_PSTATE_DID_MASK
) >> HW_PSTATE_DID_SHIFT
;
870 dprintk(" %d : fid 0x%x, did 0x%x\n", index
, fid
, did
);
872 powernow_table
[i
].index
= index
| (fid
<< HW_FID_INDEX_SHIFT
) | (did
<< HW_DID_INDEX_SHIFT
);
874 powernow_table
[i
].frequency
= find_khz_freq_from_fiddid(fid
, did
);
876 if (powernow_table
[i
].frequency
!= (data
->acpi_data
.states
[i
].core_frequency
* 1000)) {
877 printk(KERN_INFO PFX
"invalid freq entries %u kHz vs. %u kHz\n",
878 powernow_table
[i
].frequency
,
879 (unsigned int) (data
->acpi_data
.states
[i
].core_frequency
* 1000));
880 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
887 static int fill_powernow_table_fidvid(struct powernow_k8_data
*data
, struct cpufreq_frequency_table
*powernow_table
)
891 for (i
= 0; i
< data
->acpi_data
.state_count
; i
++) {
896 fid
= data
->acpi_data
.states
[i
].status
& EXT_FID_MASK
;
897 vid
= (data
->acpi_data
.states
[i
].status
>> VID_SHIFT
) & EXT_VID_MASK
;
899 fid
= data
->acpi_data
.states
[i
].control
& FID_MASK
;
900 vid
= (data
->acpi_data
.states
[i
].control
>> VID_SHIFT
) & VID_MASK
;
903 dprintk(" %d : fid 0x%x, vid 0x%x\n", i
, fid
, vid
);
905 powernow_table
[i
].index
= fid
; /* lower 8 bits */
906 powernow_table
[i
].index
|= (vid
<< 8); /* upper 8 bits */
907 powernow_table
[i
].frequency
= find_khz_freq_from_fid(fid
);
909 /* verify frequency is OK */
910 if ((powernow_table
[i
].frequency
> (MAX_FREQ
* 1000)) ||
911 (powernow_table
[i
].frequency
< (MIN_FREQ
* 1000))) {
912 dprintk("invalid freq %u kHz, ignoring\n", powernow_table
[i
].frequency
);
913 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
917 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
918 if (vid
== VID_OFF
) {
919 dprintk("invalid vid %u, ignoring\n", vid
);
920 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
924 /* verify only 1 entry from the lo frequency table */
925 if (fid
< HI_FID_TABLE_BOTTOM
) {
927 /* if both entries are the same, ignore this one ... */
928 if ((powernow_table
[i
].frequency
!= powernow_table
[cntlofreq
].frequency
) ||
929 (powernow_table
[i
].index
!= powernow_table
[cntlofreq
].index
)) {
930 printk(KERN_ERR PFX
"Too many lo freq table entries\n");
934 dprintk("double low frequency table entry, ignoring it.\n");
935 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
941 if (powernow_table
[i
].frequency
!= (data
->acpi_data
.states
[i
].core_frequency
* 1000)) {
942 printk(KERN_INFO PFX
"invalid freq entries %u kHz vs. %u kHz\n",
943 powernow_table
[i
].frequency
,
944 (unsigned int) (data
->acpi_data
.states
[i
].core_frequency
* 1000));
945 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
952 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data
*data
)
954 if (data
->acpi_data
.state_count
)
955 acpi_processor_unregister_performance(&data
->acpi_data
, data
->cpu
);
959 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data
*data
) { return -ENODEV
; }
960 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data
*data
) { return; }
961 static void powernow_k8_acpi_pst_values(struct powernow_k8_data
*data
, unsigned int index
) { return; }
962 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
964 /* Take a frequency, and issue the fid/vid transition command */
965 static int transition_frequency_fidvid(struct powernow_k8_data
*data
, unsigned int index
)
970 struct cpufreq_freqs freqs
;
972 dprintk("cpu %d transition to index %u\n", smp_processor_id(), index
);
974 /* fid/vid correctness check for k8 */
975 /* fid are the lower 8 bits of the index we stored into
976 * the cpufreq frequency table in find_psb_table, vid
977 * are the upper 8 bits.
979 fid
= data
->powernow_table
[index
].index
& 0xFF;
980 vid
= (data
->powernow_table
[index
].index
& 0xFF00) >> 8;
982 dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid
, vid
);
984 if (query_current_values_with_pending_wait(data
))
987 if ((data
->currvid
== vid
) && (data
->currfid
== fid
)) {
988 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
993 if ((fid
< HI_FID_TABLE_BOTTOM
) && (data
->currfid
< HI_FID_TABLE_BOTTOM
)) {
995 "ignoring illegal change in lo freq table-%x to 0x%x\n",
1000 dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
1001 smp_processor_id(), fid
, vid
);
1002 freqs
.old
= find_khz_freq_from_fid(data
->currfid
);
1003 freqs
.new = find_khz_freq_from_fid(fid
);
1005 for_each_cpu_mask(i
, *(data
->available_cores
)) {
1007 cpufreq_notify_transition(&freqs
, CPUFREQ_PRECHANGE
);
1010 res
= transition_fid_vid(data
, fid
, vid
);
1011 freqs
.new = find_khz_freq_from_fid(data
->currfid
);
1013 for_each_cpu_mask(i
, *(data
->available_cores
)) {
1015 cpufreq_notify_transition(&freqs
, CPUFREQ_POSTCHANGE
);
1020 /* Take a frequency, and issue the hardware pstate transition command */
1021 static int transition_frequency_pstate(struct powernow_k8_data
*data
, unsigned int index
)
1027 struct cpufreq_freqs freqs
;
1029 dprintk("cpu %d transition to index %u\n", smp_processor_id(), index
);
1031 /* get fid did for hardware pstate transition */
1032 pstate
= index
& HW_PSTATE_MASK
;
1033 if (pstate
> MAX_HW_PSTATE
)
1035 fid
= (index
& HW_FID_INDEX_MASK
) >> HW_FID_INDEX_SHIFT
;
1036 did
= (index
& HW_DID_INDEX_MASK
) >> HW_DID_INDEX_SHIFT
;
1037 freqs
.old
= find_khz_freq_from_fiddid(data
->currfid
, data
->currdid
);
1038 freqs
.new = find_khz_freq_from_fiddid(fid
, did
);
1040 for_each_cpu_mask(i
, *(data
->available_cores
)) {
1042 cpufreq_notify_transition(&freqs
, CPUFREQ_PRECHANGE
);
1045 res
= transition_pstate(data
, pstate
);
1046 data
->currfid
= find_fid_from_pstate(pstate
);
1047 data
->currdid
= find_did_from_pstate(pstate
);
1048 freqs
.new = find_khz_freq_from_fiddid(data
->currfid
, data
->currdid
);
1050 for_each_cpu_mask(i
, *(data
->available_cores
)) {
1052 cpufreq_notify_transition(&freqs
, CPUFREQ_POSTCHANGE
);
1057 /* Driver entry point to switch to the target frequency */
1058 static int powernowk8_target(struct cpufreq_policy
*pol
, unsigned targfreq
, unsigned relation
)
1060 cpumask_t oldmask
= CPU_MASK_ALL
;
1061 struct powernow_k8_data
*data
= powernow_data
[pol
->cpu
];
1064 unsigned int newstate
;
1070 checkfid
= data
->currfid
;
1071 checkvid
= data
->currvid
;
1073 /* only run on specific CPU from here on */
1074 oldmask
= current
->cpus_allowed
;
1075 set_cpus_allowed(current
, cpumask_of_cpu(pol
->cpu
));
1077 if (smp_processor_id() != pol
->cpu
) {
1078 printk(KERN_ERR PFX
"limiting to cpu %u failed\n", pol
->cpu
);
1082 if (pending_bit_stuck()) {
1083 printk(KERN_ERR PFX
"failing targ, change pending bit set\n");
1087 dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
1088 pol
->cpu
, targfreq
, pol
->min
, pol
->max
, relation
);
1090 if (query_current_values_with_pending_wait(data
))
1093 if (cpu_family
== CPU_HW_PSTATE
)
1094 dprintk("targ: curr fid 0x%x, did 0x%x\n",
1095 data
->currfid
, data
->currdid
);
1097 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
1098 data
->currfid
, data
->currvid
);
1100 if ((checkvid
!= data
->currvid
) || (checkfid
!= data
->currfid
)) {
1101 printk(KERN_INFO PFX
1102 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
1103 checkfid
, data
->currfid
, checkvid
, data
->currvid
);
1107 if (cpufreq_frequency_table_target(pol
, data
->powernow_table
, targfreq
, relation
, &newstate
))
1110 mutex_lock(&fidvid_mutex
);
1112 powernow_k8_acpi_pst_values(data
, newstate
);
1114 if (cpu_family
== CPU_HW_PSTATE
)
1115 ret
= transition_frequency_pstate(data
, newstate
);
1117 ret
= transition_frequency_fidvid(data
, newstate
);
1119 printk(KERN_ERR PFX
"transition frequency failed\n");
1121 mutex_unlock(&fidvid_mutex
);
1124 mutex_unlock(&fidvid_mutex
);
1126 if (cpu_family
== CPU_HW_PSTATE
)
1127 pol
->cur
= find_khz_freq_from_fiddid(data
->currfid
, data
->currdid
);
1129 pol
->cur
= find_khz_freq_from_fid(data
->currfid
);
1133 set_cpus_allowed(current
, oldmask
);
1137 /* Driver entry point to verify the policy and range of frequencies */
1138 static int powernowk8_verify(struct cpufreq_policy
*pol
)
1140 struct powernow_k8_data
*data
= powernow_data
[pol
->cpu
];
1145 return cpufreq_frequency_table_verify(pol
, data
->powernow_table
);
1148 /* per CPU init entry point to the driver */
1149 static int __cpuinit
powernowk8_cpu_init(struct cpufreq_policy
*pol
)
1151 struct powernow_k8_data
*data
;
1152 cpumask_t oldmask
= CPU_MASK_ALL
;
1155 if (!cpu_online(pol
->cpu
))
1158 if (!check_supported_cpu(pol
->cpu
))
1161 data
= kzalloc(sizeof(struct powernow_k8_data
), GFP_KERNEL
);
1163 printk(KERN_ERR PFX
"unable to alloc powernow_k8_data");
1167 data
->cpu
= pol
->cpu
;
1169 if (powernow_k8_cpu_init_acpi(data
)) {
1171 * Use the PSB BIOS structure. This is only availabe on
1172 * an UP version, and is deprecated by AMD.
1174 if (num_online_cpus() != 1) {
1175 printk(KERN_ERR PFX
"MP systems not supported by PSB BIOS structure\n");
1179 if (pol
->cpu
!= 0) {
1180 printk(KERN_ERR PFX
"No _PSS objects for CPU other than CPU0\n");
1184 rc
= find_psb_table(data
);
1191 /* only run on specific CPU from here on */
1192 oldmask
= current
->cpus_allowed
;
1193 set_cpus_allowed(current
, cpumask_of_cpu(pol
->cpu
));
1195 if (smp_processor_id() != pol
->cpu
) {
1196 printk(KERN_ERR PFX
"limiting to cpu %u failed\n", pol
->cpu
);
1200 if (pending_bit_stuck()) {
1201 printk(KERN_ERR PFX
"failing init, change pending bit set\n");
1205 if (query_current_values_with_pending_wait(data
))
1208 if (cpu_family
== CPU_OPTERON
)
1211 /* run on any CPU again */
1212 set_cpus_allowed(current
, oldmask
);
1214 if (cpu_family
== CPU_HW_PSTATE
)
1215 pol
->cpus
= cpumask_of_cpu(pol
->cpu
);
1217 pol
->cpus
= cpu_core_map
[pol
->cpu
];
1218 data
->available_cores
= &(pol
->cpus
);
1220 /* Take a crude guess here.
1221 * That guess was in microseconds, so multiply with 1000 */
1222 pol
->cpuinfo
.transition_latency
= (((data
->rvo
+ 8) * data
->vstable
* VST_UNITS_20US
)
1223 + (3 * (1 << data
->irt
) * 10)) * 1000;
1225 if (cpu_family
== CPU_HW_PSTATE
)
1226 pol
->cur
= find_khz_freq_from_fiddid(data
->currfid
, data
->currdid
);
1228 pol
->cur
= find_khz_freq_from_fid(data
->currfid
);
1229 dprintk("policy current frequency %d kHz\n", pol
->cur
);
1231 /* min/max the cpu is capable of */
1232 if (cpufreq_frequency_table_cpuinfo(pol
, data
->powernow_table
)) {
1233 printk(KERN_ERR PFX
"invalid powernow_table\n");
1234 powernow_k8_cpu_exit_acpi(data
);
1235 kfree(data
->powernow_table
);
1240 cpufreq_frequency_table_get_attr(data
->powernow_table
, pol
->cpu
);
1242 if (cpu_family
== CPU_HW_PSTATE
)
1243 dprintk("cpu_init done, current fid 0x%x, did 0x%x\n",
1244 data
->currfid
, data
->currdid
);
1246 dprintk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1247 data
->currfid
, data
->currvid
);
1249 powernow_data
[pol
->cpu
] = data
;
1254 set_cpus_allowed(current
, oldmask
);
1255 powernow_k8_cpu_exit_acpi(data
);
1261 static int __devexit
powernowk8_cpu_exit (struct cpufreq_policy
*pol
)
1263 struct powernow_k8_data
*data
= powernow_data
[pol
->cpu
];
1268 powernow_k8_cpu_exit_acpi(data
);
1270 cpufreq_frequency_table_put_attr(pol
->cpu
);
1272 kfree(data
->powernow_table
);
1278 static unsigned int powernowk8_get (unsigned int cpu
)
1280 struct powernow_k8_data
*data
;
1281 cpumask_t oldmask
= current
->cpus_allowed
;
1282 unsigned int khz
= 0;
1284 data
= powernow_data
[first_cpu(cpu_core_map
[cpu
])];
1289 set_cpus_allowed(current
, cpumask_of_cpu(cpu
));
1290 if (smp_processor_id() != cpu
) {
1291 printk(KERN_ERR PFX
"limiting to CPU %d failed in powernowk8_get\n", cpu
);
1292 set_cpus_allowed(current
, oldmask
);
1296 if (query_current_values_with_pending_wait(data
))
1299 if (cpu_family
== CPU_HW_PSTATE
)
1300 khz
= find_khz_freq_from_fiddid(data
->currfid
, data
->currdid
);
1302 khz
= find_khz_freq_from_fid(data
->currfid
);
1306 set_cpus_allowed(current
, oldmask
);
1310 static struct freq_attr
* powernow_k8_attr
[] = {
1311 &cpufreq_freq_attr_scaling_available_freqs
,
1315 static struct cpufreq_driver cpufreq_amd64_driver
= {
1316 .verify
= powernowk8_verify
,
1317 .target
= powernowk8_target
,
1318 .init
= powernowk8_cpu_init
,
1319 .exit
= __devexit_p(powernowk8_cpu_exit
),
1320 .get
= powernowk8_get
,
1321 .name
= "powernow-k8",
1322 .owner
= THIS_MODULE
,
1323 .attr
= powernow_k8_attr
,
1326 /* driver entry point for init */
1327 static int __cpuinit
powernowk8_init(void)
1329 unsigned int i
, supported_cpus
= 0;
1331 for_each_online_cpu(i
) {
1332 if (check_supported_cpu(i
))
1336 if (supported_cpus
== num_online_cpus()) {
1337 printk(KERN_INFO PFX
"Found %d %s "
1338 "processors (%d cpu cores) (" VERSION
")\n",
1340 boot_cpu_data
.x86_model_id
, supported_cpus
);
1341 return cpufreq_register_driver(&cpufreq_amd64_driver
);
1347 /* driver entry point for term */
1348 static void __exit
powernowk8_exit(void)
1352 cpufreq_unregister_driver(&cpufreq_amd64_driver
);
1355 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com>");
1356 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1357 MODULE_LICENSE("GPL");
1359 late_initcall(powernowk8_init
);
1360 module_exit(powernowk8_exit
);