2 * (c) 2003, 2004, 2005 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, 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 infrerred 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 <acpi/processor.h>
46 #define PFX "powernow-k8: "
47 #define BFX PFX "BIOS error: "
48 #define VERSION "version 1.50.4"
49 #include "powernow-k8.h"
51 /* serialize freq changes */
52 static DECLARE_MUTEX(fidvid_sem
);
54 static struct powernow_k8_data
*powernow_data
[NR_CPUS
];
57 static cpumask_t cpu_core_map
[1];
60 /* Return a frequency in MHz, given an input fid */
61 static u32
find_freq_from_fid(u32 fid
)
63 return 800 + (fid
* 100);
66 /* Return a frequency in KHz, given an input fid */
67 static u32
find_khz_freq_from_fid(u32 fid
)
69 return 1000 * find_freq_from_fid(fid
);
72 /* Return a voltage in miliVolts, given an input vid */
73 static u32
find_millivolts_from_vid(struct powernow_k8_data
*data
, u32 vid
)
78 /* Return the vco fid for an input fid
80 * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
81 * only from corresponding high fids. This returns "high" fid corresponding to
84 static u32
convert_fid_to_vco_fid(u32 fid
)
86 if (fid
< HI_FID_TABLE_BOTTOM
) {
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.
97 static int pending_bit_stuck(void)
101 rdmsr(MSR_FIDVID_STATUS
, lo
, hi
);
102 return lo
& MSR_S_LO_CHANGE_PENDING
? 1 : 0;
106 * Update the global current fid / vid values from the status msr.
107 * Returns 1 on error.
109 static int query_current_values_with_pending_wait(struct powernow_k8_data
*data
)
116 dprintk("detected change pending stuck\n");
119 rdmsr(MSR_FIDVID_STATUS
, lo
, hi
);
120 } while (lo
& MSR_S_LO_CHANGE_PENDING
);
122 data
->currvid
= hi
& MSR_S_HI_CURRENT_VID
;
123 data
->currfid
= lo
& MSR_S_LO_CURRENT_FID
;
128 /* the isochronous relief time */
129 static void count_off_irt(struct powernow_k8_data
*data
)
131 udelay((1 << data
->irt
) * 10);
135 /* the voltage stabalization time */
136 static void count_off_vst(struct powernow_k8_data
*data
)
138 udelay(data
->vstable
* VST_UNITS_20US
);
142 /* need to init the control msr to a safe value (for each cpu) */
143 static void fidvid_msr_init(void)
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
);
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
)
162 u32 savevid
= data
->currvid
;
165 if ((fid
& INVALID_FID_MASK
) || (data
->currvid
& INVALID_VID_MASK
)) {
166 printk(KERN_ERR PFX
"internal error - overflow on fid write\n");
170 lo
= fid
| (data
->currvid
<< MSR_C_LO_VID_SHIFT
) | MSR_C_LO_INIT_FID_VID
;
172 dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
173 fid
, lo
, data
->plllock
* PLL_LOCK_CONVERSION
);
176 wrmsr(MSR_FIDVID_CTL
, lo
, data
->plllock
* PLL_LOCK_CONVERSION
);
178 printk(KERN_ERR PFX
"internal error - pending bit very stuck - no further pstate changes possible\n");
181 } while (query_current_values_with_pending_wait(data
));
185 if (savevid
!= data
->currvid
) {
186 printk(KERN_ERR PFX
"vid change on fid trans, old 0x%x, new 0x%x\n",
187 savevid
, data
->currvid
);
191 if (fid
!= data
->currfid
) {
192 printk(KERN_ERR PFX
"fid trans failed, fid 0x%x, curr 0x%x\n", fid
,
200 /* Write a new vid to the hardware */
201 static int write_new_vid(struct powernow_k8_data
*data
, u32 vid
)
204 u32 savefid
= data
->currfid
;
207 if ((data
->currfid
& INVALID_FID_MASK
) || (vid
& INVALID_VID_MASK
)) {
208 printk(KERN_ERR PFX
"internal error - overflow on vid write\n");
212 lo
= data
->currfid
| (vid
<< MSR_C_LO_VID_SHIFT
) | MSR_C_LO_INIT_FID_VID
;
214 dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
215 vid
, lo
, STOP_GRANT_5NS
);
218 wrmsr(MSR_FIDVID_CTL
, lo
, STOP_GRANT_5NS
);
220 printk(KERN_ERR PFX
"internal error - pending bit very stuck - no further pstate changes possible\n");
223 } while (query_current_values_with_pending_wait(data
));
225 if (savefid
!= data
->currfid
) {
226 printk(KERN_ERR PFX
"fid changed on vid trans, old 0x%x new 0x%x\n",
227 savefid
, data
->currfid
);
231 if (vid
!= data
->currvid
) {
232 printk(KERN_ERR PFX
"vid trans failed, vid 0x%x, curr 0x%x\n", vid
,
241 * Reduce the vid by the max of step or reqvid.
242 * Decreasing vid codes represent increasing voltages:
243 * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
245 static int decrease_vid_code_by_step(struct powernow_k8_data
*data
, u32 reqvid
, u32 step
)
247 if ((data
->currvid
- reqvid
) > step
)
248 reqvid
= data
->currvid
- step
;
250 if (write_new_vid(data
, reqvid
))
258 /* Change the fid and vid, by the 3 phases. */
259 static int transition_fid_vid(struct powernow_k8_data
*data
, u32 reqfid
, u32 reqvid
)
261 if (core_voltage_pre_transition(data
, reqvid
))
264 if (core_frequency_transition(data
, reqfid
))
267 if (core_voltage_post_transition(data
, reqvid
))
270 if (query_current_values_with_pending_wait(data
))
273 if ((reqfid
!= data
->currfid
) || (reqvid
!= data
->currvid
)) {
274 printk(KERN_ERR PFX
"failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
276 reqfid
, reqvid
, data
->currfid
, data
->currvid
);
280 dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
281 smp_processor_id(), data
->currfid
, data
->currvid
);
286 /* Phase 1 - core voltage transition ... setup voltage */
287 static int core_voltage_pre_transition(struct powernow_k8_data
*data
, u32 reqvid
)
289 u32 rvosteps
= data
->rvo
;
290 u32 savefid
= data
->currfid
;
293 dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
295 data
->currfid
, data
->currvid
, reqvid
, data
->rvo
);
297 rdmsr(MSR_FIDVID_STATUS
, lo
, maxvid
);
298 maxvid
= 0x1f & (maxvid
>> 16);
299 dprintk("ph1 maxvid=0x%x\n", maxvid
);
300 if (reqvid
< maxvid
) /* lower numbers are higher voltages */
303 while (data
->currvid
> reqvid
) {
304 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
305 data
->currvid
, reqvid
);
306 if (decrease_vid_code_by_step(data
, reqvid
, data
->vidmvs
))
310 while ((rvosteps
> 0) && ((data
->rvo
+ data
->currvid
) > reqvid
)) {
311 if (data
->currvid
== maxvid
) {
314 dprintk("ph1: changing vid for rvo, req 0x%x\n",
316 if (decrease_vid_code_by_step(data
, data
->currvid
- 1, 1))
322 if (query_current_values_with_pending_wait(data
))
325 if (savefid
!= data
->currfid
) {
326 printk(KERN_ERR PFX
"ph1 err, currfid changed 0x%x\n", data
->currfid
);
330 dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
331 data
->currfid
, data
->currvid
);
336 /* Phase 2 - core frequency transition */
337 static int core_frequency_transition(struct powernow_k8_data
*data
, u32 reqfid
)
339 u32 vcoreqfid
, vcocurrfid
, vcofiddiff
, savevid
= data
->currvid
;
341 if ((reqfid
< HI_FID_TABLE_BOTTOM
) && (data
->currfid
< HI_FID_TABLE_BOTTOM
)) {
342 printk(KERN_ERR PFX
"ph2: illegal lo-lo transition 0x%x 0x%x\n",
343 reqfid
, data
->currfid
);
347 if (data
->currfid
== reqfid
) {
348 printk(KERN_ERR PFX
"ph2 null fid transition 0x%x\n", data
->currfid
);
352 dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
354 data
->currfid
, data
->currvid
, reqfid
);
356 vcoreqfid
= convert_fid_to_vco_fid(reqfid
);
357 vcocurrfid
= convert_fid_to_vco_fid(data
->currfid
);
358 vcofiddiff
= vcocurrfid
> vcoreqfid
? vcocurrfid
- vcoreqfid
359 : vcoreqfid
- vcocurrfid
;
361 while (vcofiddiff
> 2) {
362 if (reqfid
> data
->currfid
) {
363 if (data
->currfid
> LO_FID_TABLE_TOP
) {
364 if (write_new_fid(data
, data
->currfid
+ 2)) {
369 (data
, 2 + convert_fid_to_vco_fid(data
->currfid
))) {
374 if (write_new_fid(data
, data
->currfid
- 2))
378 vcocurrfid
= convert_fid_to_vco_fid(data
->currfid
);
379 vcofiddiff
= vcocurrfid
> vcoreqfid
? vcocurrfid
- vcoreqfid
380 : vcoreqfid
- vcocurrfid
;
383 if (write_new_fid(data
, reqfid
))
386 if (query_current_values_with_pending_wait(data
))
389 if (data
->currfid
!= reqfid
) {
391 "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
392 data
->currfid
, reqfid
);
396 if (savevid
!= data
->currvid
) {
397 printk(KERN_ERR PFX
"ph2: vid changed, save 0x%x, curr 0x%x\n",
398 savevid
, data
->currvid
);
402 dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
403 data
->currfid
, data
->currvid
);
408 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
409 static int core_voltage_post_transition(struct powernow_k8_data
*data
, u32 reqvid
)
411 u32 savefid
= data
->currfid
;
412 u32 savereqvid
= reqvid
;
414 dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
416 data
->currfid
, data
->currvid
);
418 if (reqvid
!= data
->currvid
) {
419 if (write_new_vid(data
, reqvid
))
422 if (savefid
!= data
->currfid
) {
424 "ph3: bad fid change, save 0x%x, curr 0x%x\n",
425 savefid
, data
->currfid
);
429 if (data
->currvid
!= reqvid
) {
431 "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
432 reqvid
, data
->currvid
);
437 if (query_current_values_with_pending_wait(data
))
440 if (savereqvid
!= data
->currvid
) {
441 dprintk("ph3 failed, currvid 0x%x\n", data
->currvid
);
445 if (savefid
!= data
->currfid
) {
446 dprintk("ph3 failed, currfid changed 0x%x\n",
451 dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
452 data
->currfid
, data
->currvid
);
457 static int check_supported_cpu(unsigned int cpu
)
459 cpumask_t oldmask
= CPU_MASK_ALL
;
460 u32 eax
, ebx
, ecx
, edx
;
463 oldmask
= current
->cpus_allowed
;
464 set_cpus_allowed(current
, cpumask_of_cpu(cpu
));
467 if (smp_processor_id() != cpu
) {
468 printk(KERN_ERR
"limiting to cpu %u failed\n", cpu
);
472 if (current_cpu_data
.x86_vendor
!= X86_VENDOR_AMD
)
475 eax
= cpuid_eax(CPUID_PROCESSOR_SIGNATURE
);
476 if (((eax
& CPUID_USE_XFAM_XMOD
) != CPUID_USE_XFAM_XMOD
) ||
477 ((eax
& CPUID_XFAM
) != CPUID_XFAM_K8
) ||
478 ((eax
& CPUID_XMOD
) > CPUID_XMOD_REV_F
)) {
479 printk(KERN_INFO PFX
"Processor cpuid %x not supported\n", eax
);
483 eax
= cpuid_eax(CPUID_GET_MAX_CAPABILITIES
);
484 if (eax
< CPUID_FREQ_VOLT_CAPABILITIES
) {
486 "No frequency change capabilities detected\n");
490 cpuid(CPUID_FREQ_VOLT_CAPABILITIES
, &eax
, &ebx
, &ecx
, &edx
);
491 if ((edx
& P_STATE_TRANSITION_CAPABLE
) != P_STATE_TRANSITION_CAPABLE
) {
492 printk(KERN_INFO PFX
"Power state transitions not supported\n");
499 set_cpus_allowed(current
, oldmask
);
505 static int check_pst_table(struct powernow_k8_data
*data
, struct pst_s
*pst
, u8 maxvid
)
510 for (j
= 0; j
< data
->numps
; j
++) {
511 if (pst
[j
].vid
> LEAST_VID
) {
512 printk(KERN_ERR PFX
"vid %d invalid : 0x%x\n", j
, pst
[j
].vid
);
515 if (pst
[j
].vid
< data
->rvo
) { /* vid + rvo >= 0 */
516 printk(KERN_ERR BFX
"0 vid exceeded with pstate %d\n", j
);
519 if (pst
[j
].vid
< maxvid
+ data
->rvo
) { /* vid + rvo >= maxvid */
520 printk(KERN_ERR BFX
"maxvid exceeded with pstate %d\n", j
);
523 if ((pst
[j
].fid
> MAX_FID
)
525 || (j
&& (pst
[j
].fid
< HI_FID_TABLE_BOTTOM
))) {
526 /* Only first fid is allowed to be in "low" range */
527 printk(KERN_ERR PFX
"two low fids - %d : 0x%x\n", j
, pst
[j
].fid
);
530 if (pst
[j
].fid
< lastfid
)
531 lastfid
= pst
[j
].fid
;
534 printk(KERN_ERR PFX
"lastfid invalid\n");
537 if (lastfid
> LO_FID_TABLE_TOP
)
538 printk(KERN_INFO PFX
"first fid not from lo freq table\n");
543 static void print_basics(struct powernow_k8_data
*data
)
546 for (j
= 0; j
< data
->numps
; j
++) {
547 if (data
->powernow_table
[j
].frequency
!= CPUFREQ_ENTRY_INVALID
)
548 printk(KERN_INFO PFX
" %d : fid 0x%x (%d MHz), vid 0x%x (%d mV)\n", j
,
549 data
->powernow_table
[j
].index
& 0xff,
550 data
->powernow_table
[j
].frequency
/1000,
551 data
->powernow_table
[j
].index
>> 8,
552 find_millivolts_from_vid(data
, data
->powernow_table
[j
].index
>> 8));
555 printk(KERN_INFO PFX
"Only %d pstates on battery\n", data
->batps
);
558 static int fill_powernow_table(struct powernow_k8_data
*data
, struct pst_s
*pst
, u8 maxvid
)
560 struct cpufreq_frequency_table
*powernow_table
;
563 if (data
->batps
) { /* use ACPI support to get full speed on mains power */
564 printk(KERN_WARNING PFX
"Only %d pstates usable (use ACPI driver for full range\n", data
->batps
);
565 data
->numps
= data
->batps
;
568 for ( j
=1; j
<data
->numps
; j
++ ) {
569 if (pst
[j
-1].fid
>= pst
[j
].fid
) {
570 printk(KERN_ERR PFX
"PST out of sequence\n");
575 if (data
->numps
< 2) {
576 printk(KERN_ERR PFX
"no p states to transition\n");
580 if (check_pst_table(data
, pst
, maxvid
))
583 powernow_table
= kmalloc((sizeof(struct cpufreq_frequency_table
)
584 * (data
->numps
+ 1)), GFP_KERNEL
);
585 if (!powernow_table
) {
586 printk(KERN_ERR PFX
"powernow_table memory alloc failure\n");
590 for (j
= 0; j
< data
->numps
; j
++) {
591 powernow_table
[j
].index
= pst
[j
].fid
; /* lower 8 bits */
592 powernow_table
[j
].index
|= (pst
[j
].vid
<< 8); /* upper 8 bits */
593 powernow_table
[j
].frequency
= find_khz_freq_from_fid(pst
[j
].fid
);
595 powernow_table
[data
->numps
].frequency
= CPUFREQ_TABLE_END
;
596 powernow_table
[data
->numps
].index
= 0;
598 if (query_current_values_with_pending_wait(data
)) {
599 kfree(powernow_table
);
603 dprintk("cfid 0x%x, cvid 0x%x\n", data
->currfid
, data
->currvid
);
604 data
->powernow_table
= powernow_table
;
607 for (j
= 0; j
< data
->numps
; j
++)
608 if ((pst
[j
].fid
==data
->currfid
) && (pst
[j
].vid
==data
->currvid
))
611 dprintk("currfid/vid do not match PST, ignoring\n");
615 /* Find and validate the PSB/PST table in BIOS. */
616 static int find_psb_table(struct powernow_k8_data
*data
)
625 for (i
= 0xc0000; i
< 0xffff0; i
+= 0x10) {
626 /* Scan BIOS looking for the signature. */
627 /* It can not be at ffff0 - it is too big. */
629 psb
= phys_to_virt(i
);
630 if (memcmp(psb
, PSB_ID_STRING
, PSB_ID_STRING_LEN
) != 0)
633 dprintk("found PSB header at 0x%p\n", psb
);
635 dprintk("table vers: 0x%x\n", psb
->tableversion
);
636 if (psb
->tableversion
!= PSB_VERSION_1_4
) {
637 printk(KERN_INFO BFX
"PSB table is not v1.4\n");
641 dprintk("flags: 0x%x\n", psb
->flags1
);
643 printk(KERN_ERR BFX
"unknown flags\n");
647 data
->vstable
= psb
->vstable
;
648 dprintk("voltage stabilization time: %d(*20us)\n", data
->vstable
);
650 dprintk("flags2: 0x%x\n", psb
->flags2
);
651 data
->rvo
= psb
->flags2
& 3;
652 data
->irt
= ((psb
->flags2
) >> 2) & 3;
653 mvs
= ((psb
->flags2
) >> 4) & 3;
654 data
->vidmvs
= 1 << mvs
;
655 data
->batps
= ((psb
->flags2
) >> 6) & 3;
657 dprintk("ramp voltage offset: %d\n", data
->rvo
);
658 dprintk("isochronous relief time: %d\n", data
->irt
);
659 dprintk("maximum voltage step: %d - 0x%x\n", mvs
, data
->vidmvs
);
661 dprintk("numpst: 0x%x\n", psb
->num_tables
);
662 cpst
= psb
->num_tables
;
663 if ((psb
->cpuid
== 0x00000fc0) || (psb
->cpuid
== 0x00000fe0) ){
664 thiscpuid
= cpuid_eax(CPUID_PROCESSOR_SIGNATURE
);
665 if ((thiscpuid
== 0x00000fc0) || (thiscpuid
== 0x00000fe0) ) {
670 printk(KERN_ERR BFX
"numpst must be 1\n");
674 data
->plllock
= psb
->plllocktime
;
675 dprintk("plllocktime: 0x%x (units 1us)\n", psb
->plllocktime
);
676 dprintk("maxfid: 0x%x\n", psb
->maxfid
);
677 dprintk("maxvid: 0x%x\n", psb
->maxvid
);
678 maxvid
= psb
->maxvid
;
680 data
->numps
= psb
->numps
;
681 dprintk("numpstates: 0x%x\n", data
->numps
);
682 return fill_powernow_table(data
, (struct pst_s
*)(psb
+1), maxvid
);
685 * If you see this message, complain to BIOS manufacturer. If
686 * he tells you "we do not support Linux" or some similar
687 * nonsense, remember that Windows 2000 uses the same legacy
688 * mechanism that the old Linux PSB driver uses. Tell them it
689 * is broken with Windows 2000.
691 * The reference to the AMD documentation is chapter 9 in the
692 * BIOS and Kernel Developer's Guide, which is available on
695 printk(KERN_INFO PFX
"BIOS error - no PSB or ACPI _PSS objects\n");
699 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
700 static void powernow_k8_acpi_pst_values(struct powernow_k8_data
*data
, unsigned int index
)
702 if (!data
->acpi_data
.state_count
)
705 data
->irt
= (data
->acpi_data
.states
[index
].control
>> IRT_SHIFT
) & IRT_MASK
;
706 data
->rvo
= (data
->acpi_data
.states
[index
].control
>> RVO_SHIFT
) & RVO_MASK
;
707 data
->exttype
= (data
->acpi_data
.states
[index
].control
>> EXT_TYPE_SHIFT
) & EXT_TYPE_MASK
;
708 data
->plllock
= (data
->acpi_data
.states
[index
].control
>> PLL_L_SHIFT
) & PLL_L_MASK
;
709 data
->vidmvs
= 1 << ((data
->acpi_data
.states
[index
].control
>> MVS_SHIFT
) & MVS_MASK
);
710 data
->vstable
= (data
->acpi_data
.states
[index
].control
>> VST_SHIFT
) & VST_MASK
;
713 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data
*data
)
717 struct cpufreq_frequency_table
*powernow_table
;
719 if (acpi_processor_register_performance(&data
->acpi_data
, data
->cpu
)) {
720 dprintk("register performance failed: bad ACPI data\n");
724 /* verify the data contained in the ACPI structures */
725 if (data
->acpi_data
.state_count
<= 1) {
726 dprintk("No ACPI P-States\n");
730 if ((data
->acpi_data
.control_register
.space_id
!= ACPI_ADR_SPACE_FIXED_HARDWARE
) ||
731 (data
->acpi_data
.status_register
.space_id
!= ACPI_ADR_SPACE_FIXED_HARDWARE
)) {
732 dprintk("Invalid control/status registers (%x - %x)\n",
733 data
->acpi_data
.control_register
.space_id
,
734 data
->acpi_data
.status_register
.space_id
);
738 /* fill in data->powernow_table */
739 powernow_table
= kmalloc((sizeof(struct cpufreq_frequency_table
)
740 * (data
->acpi_data
.state_count
+ 1)), GFP_KERNEL
);
741 if (!powernow_table
) {
742 dprintk("powernow_table memory alloc failure\n");
746 for (i
= 0; i
< data
->acpi_data
.state_count
; i
++) {
751 fid
= data
->acpi_data
.states
[i
].status
& FID_MASK
;
752 vid
= (data
->acpi_data
.states
[i
].status
>> VID_SHIFT
) & VID_MASK
;
754 fid
= data
->acpi_data
.states
[i
].control
& FID_MASK
;
755 vid
= (data
->acpi_data
.states
[i
].control
>> VID_SHIFT
) & VID_MASK
;
758 dprintk(" %d : fid 0x%x, vid 0x%x\n", i
, fid
, vid
);
760 powernow_table
[i
].index
= fid
; /* lower 8 bits */
761 powernow_table
[i
].index
|= (vid
<< 8); /* upper 8 bits */
762 powernow_table
[i
].frequency
= find_khz_freq_from_fid(fid
);
764 /* verify frequency is OK */
765 if ((powernow_table
[i
].frequency
> (MAX_FREQ
* 1000)) ||
766 (powernow_table
[i
].frequency
< (MIN_FREQ
* 1000))) {
767 dprintk("invalid freq %u kHz, ignoring\n", powernow_table
[i
].frequency
);
768 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
772 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
773 if (vid
== VID_OFF
) {
774 dprintk("invalid vid %u, ignoring\n", vid
);
775 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
779 /* verify only 1 entry from the lo frequency table */
780 if (fid
< HI_FID_TABLE_BOTTOM
) {
782 /* if both entries are the same, ignore this
785 if ((powernow_table
[i
].frequency
!= powernow_table
[cntlofreq
].frequency
) ||
786 (powernow_table
[i
].index
!= powernow_table
[cntlofreq
].index
)) {
787 printk(KERN_ERR PFX
"Too many lo freq table entries\n");
791 dprintk("double low frequency table entry, ignoring it.\n");
792 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
798 if (powernow_table
[i
].frequency
!= (data
->acpi_data
.states
[i
].core_frequency
* 1000)) {
799 printk(KERN_INFO PFX
"invalid freq entries %u kHz vs. %u kHz\n",
800 powernow_table
[i
].frequency
,
801 (unsigned int) (data
->acpi_data
.states
[i
].core_frequency
* 1000));
802 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
807 powernow_table
[data
->acpi_data
.state_count
].frequency
= CPUFREQ_TABLE_END
;
808 powernow_table
[data
->acpi_data
.state_count
].index
= 0;
809 data
->powernow_table
= powernow_table
;
812 data
->numps
= data
->acpi_data
.state_count
;
814 powernow_k8_acpi_pst_values(data
, 0);
816 /* notify BIOS that we exist */
817 acpi_processor_notify_smm(THIS_MODULE
);
822 kfree(powernow_table
);
825 acpi_processor_unregister_performance(&data
->acpi_data
, data
->cpu
);
827 /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
828 data
->acpi_data
.state_count
= 0;
833 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data
*data
)
835 if (data
->acpi_data
.state_count
)
836 acpi_processor_unregister_performance(&data
->acpi_data
, data
->cpu
);
840 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data
*data
) { return -ENODEV
; }
841 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data
*data
) { return; }
842 static void powernow_k8_acpi_pst_values(struct powernow_k8_data
*data
, unsigned int index
) { return; }
843 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
845 /* Take a frequency, and issue the fid/vid transition command */
846 static int transition_frequency(struct powernow_k8_data
*data
, unsigned int index
)
851 struct cpufreq_freqs freqs
;
853 dprintk("cpu %d transition to index %u\n", smp_processor_id(), index
);
855 /* fid are the lower 8 bits of the index we stored into
856 * the cpufreq frequency table in find_psb_table, vid are
860 fid
= data
->powernow_table
[index
].index
& 0xFF;
861 vid
= (data
->powernow_table
[index
].index
& 0xFF00) >> 8;
863 dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid
, vid
);
865 if (query_current_values_with_pending_wait(data
))
868 if ((data
->currvid
== vid
) && (data
->currfid
== fid
)) {
869 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
874 if ((fid
< HI_FID_TABLE_BOTTOM
) && (data
->currfid
< HI_FID_TABLE_BOTTOM
)) {
876 "ignoring illegal change in lo freq table-%x to 0x%x\n",
881 dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
882 smp_processor_id(), fid
, vid
);
884 freqs
.cpu
= data
->cpu
;
885 freqs
.old
= find_khz_freq_from_fid(data
->currfid
);
886 freqs
.new = find_khz_freq_from_fid(fid
);
887 for_each_cpu_mask(i
, cpu_core_map
[data
->cpu
]) {
889 cpufreq_notify_transition(&freqs
, CPUFREQ_PRECHANGE
);
892 res
= transition_fid_vid(data
, fid
, vid
);
894 freqs
.new = find_khz_freq_from_fid(data
->currfid
);
895 for_each_cpu_mask(i
, cpu_core_map
[data
->cpu
]) {
897 cpufreq_notify_transition(&freqs
, CPUFREQ_POSTCHANGE
);
902 /* Driver entry point to switch to the target frequency */
903 static int powernowk8_target(struct cpufreq_policy
*pol
, unsigned targfreq
, unsigned relation
)
905 cpumask_t oldmask
= CPU_MASK_ALL
;
906 struct powernow_k8_data
*data
= powernow_data
[pol
->cpu
];
907 u32 checkfid
= data
->currfid
;
908 u32 checkvid
= data
->currvid
;
909 unsigned int newstate
;
913 /* only run on specific CPU from here on */
914 oldmask
= current
->cpus_allowed
;
915 set_cpus_allowed(current
, cpumask_of_cpu(pol
->cpu
));
918 if (smp_processor_id() != pol
->cpu
) {
919 printk(KERN_ERR
"limiting to cpu %u failed\n", pol
->cpu
);
923 if (pending_bit_stuck()) {
924 printk(KERN_ERR PFX
"failing targ, change pending bit set\n");
928 dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
929 pol
->cpu
, targfreq
, pol
->min
, pol
->max
, relation
);
931 if (query_current_values_with_pending_wait(data
)) {
936 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
937 data
->currfid
, data
->currvid
);
939 if ((checkvid
!= data
->currvid
) || (checkfid
!= data
->currfid
)) {
941 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
942 checkfid
, data
->currfid
, checkvid
, data
->currvid
);
945 if (cpufreq_frequency_table_target(pol
, data
->powernow_table
, targfreq
, relation
, &newstate
))
950 powernow_k8_acpi_pst_values(data
, newstate
);
952 if (transition_frequency(data
, newstate
)) {
953 printk(KERN_ERR PFX
"transition frequency failed\n");
959 /* Update all the fid/vids of our siblings */
960 for_each_cpu_mask(i
, cpu_core_map
[pol
->cpu
]) {
961 powernow_data
[i
]->currvid
= data
->currvid
;
962 powernow_data
[i
]->currfid
= data
->currfid
;
966 pol
->cur
= find_khz_freq_from_fid(data
->currfid
);
970 set_cpus_allowed(current
, oldmask
);
976 /* Driver entry point to verify the policy and range of frequencies */
977 static int powernowk8_verify(struct cpufreq_policy
*pol
)
979 struct powernow_k8_data
*data
= powernow_data
[pol
->cpu
];
981 return cpufreq_frequency_table_verify(pol
, data
->powernow_table
);
984 /* per CPU init entry point to the driver */
985 static int __init
powernowk8_cpu_init(struct cpufreq_policy
*pol
)
987 struct powernow_k8_data
*data
;
988 cpumask_t oldmask
= CPU_MASK_ALL
;
991 if (!check_supported_cpu(pol
->cpu
))
994 data
= kmalloc(sizeof(struct powernow_k8_data
), GFP_KERNEL
);
996 printk(KERN_ERR PFX
"unable to alloc powernow_k8_data");
999 memset(data
,0,sizeof(struct powernow_k8_data
));
1001 data
->cpu
= pol
->cpu
;
1003 if (powernow_k8_cpu_init_acpi(data
)) {
1005 * Use the PSB BIOS structure. This is only availabe on
1006 * an UP version, and is deprecated by AMD.
1009 if ((num_online_cpus() != 1) || (num_possible_cpus() != 1)) {
1010 printk(KERN_ERR PFX
"MP systems not supported by PSB BIOS structure\n");
1014 if (pol
->cpu
!= 0) {
1015 printk(KERN_ERR PFX
"init not cpu 0\n");
1019 rc
= find_psb_table(data
);
1026 /* only run on specific CPU from here on */
1027 oldmask
= current
->cpus_allowed
;
1028 set_cpus_allowed(current
, cpumask_of_cpu(pol
->cpu
));
1031 if (smp_processor_id() != pol
->cpu
) {
1032 printk(KERN_ERR
"limiting to cpu %u failed\n", pol
->cpu
);
1036 if (pending_bit_stuck()) {
1037 printk(KERN_ERR PFX
"failing init, change pending bit set\n");
1041 if (query_current_values_with_pending_wait(data
))
1046 /* run on any CPU again */
1047 set_cpus_allowed(current
, oldmask
);
1050 pol
->governor
= CPUFREQ_DEFAULT_GOVERNOR
;
1051 pol
->cpus
= cpu_core_map
[pol
->cpu
];
1053 /* Take a crude guess here.
1054 * That guess was in microseconds, so multiply with 1000 */
1055 pol
->cpuinfo
.transition_latency
= (((data
->rvo
+ 8) * data
->vstable
* VST_UNITS_20US
)
1056 + (3 * (1 << data
->irt
) * 10)) * 1000;
1058 pol
->cur
= find_khz_freq_from_fid(data
->currfid
);
1059 dprintk("policy current frequency %d kHz\n", pol
->cur
);
1061 /* min/max the cpu is capable of */
1062 if (cpufreq_frequency_table_cpuinfo(pol
, data
->powernow_table
)) {
1063 printk(KERN_ERR PFX
"invalid powernow_table\n");
1064 powernow_k8_cpu_exit_acpi(data
);
1065 kfree(data
->powernow_table
);
1070 cpufreq_frequency_table_get_attr(data
->powernow_table
, pol
->cpu
);
1072 printk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1073 data
->currfid
, data
->currvid
);
1075 for_each_cpu_mask(i
, cpu_core_map
[pol
->cpu
]) {
1076 powernow_data
[i
] = data
;
1082 set_cpus_allowed(current
, oldmask
);
1084 powernow_k8_cpu_exit_acpi(data
);
1090 static int __devexit
powernowk8_cpu_exit (struct cpufreq_policy
*pol
)
1092 struct powernow_k8_data
*data
= powernow_data
[pol
->cpu
];
1097 powernow_k8_cpu_exit_acpi(data
);
1099 cpufreq_frequency_table_put_attr(pol
->cpu
);
1101 kfree(data
->powernow_table
);
1107 static unsigned int powernowk8_get (unsigned int cpu
)
1109 struct powernow_k8_data
*data
= powernow_data
[cpu
];
1110 cpumask_t oldmask
= current
->cpus_allowed
;
1111 unsigned int khz
= 0;
1113 set_cpus_allowed(current
, cpumask_of_cpu(cpu
));
1114 if (smp_processor_id() != cpu
) {
1115 printk(KERN_ERR PFX
"limiting to CPU %d failed in powernowk8_get\n", cpu
);
1116 set_cpus_allowed(current
, oldmask
);
1121 if (query_current_values_with_pending_wait(data
))
1124 khz
= find_khz_freq_from_fid(data
->currfid
);
1127 preempt_enable_no_resched();
1128 set_cpus_allowed(current
, oldmask
);
1133 static struct freq_attr
* powernow_k8_attr
[] = {
1134 &cpufreq_freq_attr_scaling_available_freqs
,
1138 static struct cpufreq_driver cpufreq_amd64_driver
= {
1139 .verify
= powernowk8_verify
,
1140 .target
= powernowk8_target
,
1141 .init
= powernowk8_cpu_init
,
1142 .exit
= __devexit_p(powernowk8_cpu_exit
),
1143 .get
= powernowk8_get
,
1144 .name
= "powernow-k8",
1145 .owner
= THIS_MODULE
,
1146 .attr
= powernow_k8_attr
,
1149 /* driver entry point for init */
1150 static int __init
powernowk8_init(void)
1152 unsigned int i
, supported_cpus
= 0;
1154 for (i
=0; i
<NR_CPUS
; i
++) {
1157 if (check_supported_cpu(i
))
1161 if (supported_cpus
== num_online_cpus()) {
1162 printk(KERN_INFO PFX
"Found %d AMD Athlon 64 / Opteron processors (" VERSION
")\n",
1164 return cpufreq_register_driver(&cpufreq_amd64_driver
);
1170 /* driver entry point for term */
1171 static void __exit
powernowk8_exit(void)
1175 cpufreq_unregister_driver(&cpufreq_amd64_driver
);
1178 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com.");
1179 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1180 MODULE_LICENSE("GPL");
1182 late_initcall(powernowk8_init
);
1183 module_exit(powernowk8_exit
);