2 * (c) 2003, 2004 Advanced Micro Devices, Inc.
3 * Your use of this code is subject to the terms and conditions of the
4 * GNU general public license version 2. See "COPYING" or
5 * http://www.gnu.org/licenses/gpl.html
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>
38 #include <asm/delay.h>
40 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
41 #include <linux/acpi.h>
42 #include <acpi/processor.h>
45 #define PFX "powernow-k8: "
46 #define BFX PFX "BIOS error: "
47 #define VERSION "version 1.40.2"
48 #include "powernow-k8.h"
50 /* serialize freq changes */
51 static DECLARE_MUTEX(fidvid_sem
);
53 static struct powernow_k8_data
*powernow_data
[NR_CPUS
];
56 static cpumask_t cpu_core_map
[1];
59 /* Return a frequency in MHz, given an input fid */
60 static u32
find_freq_from_fid(u32 fid
)
62 return 800 + (fid
* 100);
65 /* Return a frequency in KHz, given an input fid */
66 static u32
find_khz_freq_from_fid(u32 fid
)
68 return 1000 * find_freq_from_fid(fid
);
71 /* Return a voltage in miliVolts, given an input vid */
72 static u32
find_millivolts_from_vid(struct powernow_k8_data
*data
, u32 vid
)
77 /* Return the vco fid for an input fid
79 * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
80 * only from corresponding high fids. This returns "high" fid corresponding to
83 static u32
convert_fid_to_vco_fid(u32 fid
)
85 if (fid
< HI_FID_TABLE_BOTTOM
) {
93 * Return 1 if the pending bit is set. Unless we just instructed the processor
94 * to transition to a new state, seeing this bit set is really bad news.
96 static int pending_bit_stuck(void)
100 rdmsr(MSR_FIDVID_STATUS
, lo
, hi
);
101 return lo
& MSR_S_LO_CHANGE_PENDING
? 1 : 0;
105 * Update the global current fid / vid values from the status msr.
106 * Returns 1 on error.
108 static int query_current_values_with_pending_wait(struct powernow_k8_data
*data
)
114 if (i
++ > 0x1000000) {
115 printk(KERN_ERR PFX
"detected change pending stuck\n");
118 rdmsr(MSR_FIDVID_STATUS
, lo
, hi
);
119 } while (lo
& MSR_S_LO_CHANGE_PENDING
);
121 data
->currvid
= hi
& MSR_S_HI_CURRENT_VID
;
122 data
->currfid
= lo
& MSR_S_LO_CURRENT_FID
;
127 /* the isochronous relief time */
128 static void count_off_irt(struct powernow_k8_data
*data
)
130 udelay((1 << data
->irt
) * 10);
134 /* the voltage stabalization time */
135 static void count_off_vst(struct powernow_k8_data
*data
)
137 udelay(data
->vstable
* VST_UNITS_20US
);
141 /* need to init the control msr to a safe value (for each cpu) */
142 static void fidvid_msr_init(void)
147 rdmsr(MSR_FIDVID_STATUS
, lo
, hi
);
148 vid
= hi
& MSR_S_HI_CURRENT_VID
;
149 fid
= lo
& MSR_S_LO_CURRENT_FID
;
150 lo
= fid
| (vid
<< MSR_C_LO_VID_SHIFT
);
151 hi
= MSR_C_HI_STP_GNT_BENIGN
;
152 dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo
, hi
);
153 wrmsr(MSR_FIDVID_CTL
, lo
, hi
);
157 /* write the new fid value along with the other control fields to the msr */
158 static int write_new_fid(struct powernow_k8_data
*data
, u32 fid
)
161 u32 savevid
= data
->currvid
;
163 if ((fid
& INVALID_FID_MASK
) || (data
->currvid
& INVALID_VID_MASK
)) {
164 printk(KERN_ERR PFX
"internal error - overflow on fid write\n");
168 lo
= fid
| (data
->currvid
<< MSR_C_LO_VID_SHIFT
) | MSR_C_LO_INIT_FID_VID
;
170 dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
171 fid
, lo
, data
->plllock
* PLL_LOCK_CONVERSION
);
173 wrmsr(MSR_FIDVID_CTL
, lo
, data
->plllock
* PLL_LOCK_CONVERSION
);
175 if (query_current_values_with_pending_wait(data
))
180 if (savevid
!= data
->currvid
) {
181 printk(KERN_ERR PFX
"vid change on fid trans, old 0x%x, new 0x%x\n",
182 savevid
, data
->currvid
);
186 if (fid
!= data
->currfid
) {
187 printk(KERN_ERR PFX
"fid trans failed, fid 0x%x, curr 0x%x\n", fid
,
195 /* Write a new vid to the hardware */
196 static int write_new_vid(struct powernow_k8_data
*data
, u32 vid
)
199 u32 savefid
= data
->currfid
;
201 if ((data
->currfid
& INVALID_FID_MASK
) || (vid
& INVALID_VID_MASK
)) {
202 printk(KERN_ERR PFX
"internal error - overflow on vid write\n");
206 lo
= data
->currfid
| (vid
<< MSR_C_LO_VID_SHIFT
) | MSR_C_LO_INIT_FID_VID
;
208 dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
209 vid
, lo
, STOP_GRANT_5NS
);
211 wrmsr(MSR_FIDVID_CTL
, lo
, STOP_GRANT_5NS
);
213 if (query_current_values_with_pending_wait(data
))
216 if (savefid
!= data
->currfid
) {
217 printk(KERN_ERR PFX
"fid changed on vid trans, old 0x%x new 0x%x\n",
218 savefid
, data
->currfid
);
222 if (vid
!= data
->currvid
) {
223 printk(KERN_ERR PFX
"vid trans failed, vid 0x%x, curr 0x%x\n", vid
,
232 * Reduce the vid by the max of step or reqvid.
233 * Decreasing vid codes represent increasing voltages:
234 * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of 0x1f is off.
236 static int decrease_vid_code_by_step(struct powernow_k8_data
*data
, u32 reqvid
, u32 step
)
238 if ((data
->currvid
- reqvid
) > step
)
239 reqvid
= data
->currvid
- step
;
241 if (write_new_vid(data
, reqvid
))
249 /* Change the fid and vid, by the 3 phases. */
250 static int transition_fid_vid(struct powernow_k8_data
*data
, u32 reqfid
, u32 reqvid
)
252 if (core_voltage_pre_transition(data
, reqvid
))
255 if (core_frequency_transition(data
, reqfid
))
258 if (core_voltage_post_transition(data
, reqvid
))
261 if (query_current_values_with_pending_wait(data
))
264 if ((reqfid
!= data
->currfid
) || (reqvid
!= data
->currvid
)) {
265 printk(KERN_ERR PFX
"failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
267 reqfid
, reqvid
, data
->currfid
, data
->currvid
);
271 dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
272 smp_processor_id(), data
->currfid
, data
->currvid
);
277 /* Phase 1 - core voltage transition ... setup voltage */
278 static int core_voltage_pre_transition(struct powernow_k8_data
*data
, u32 reqvid
)
280 u32 rvosteps
= data
->rvo
;
281 u32 savefid
= data
->currfid
;
284 dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
286 data
->currfid
, data
->currvid
, reqvid
, data
->rvo
);
288 rdmsr(MSR_FIDVID_STATUS
, lo
, maxvid
);
289 maxvid
= 0x1f & (maxvid
>> 16);
290 dprintk("ph1 maxvid=0x%x\n", maxvid
);
291 if (reqvid
< maxvid
) /* lower numbers are higher voltages */
294 while (data
->currvid
> reqvid
) {
295 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
296 data
->currvid
, reqvid
);
297 if (decrease_vid_code_by_step(data
, reqvid
, data
->vidmvs
))
301 while ((rvosteps
> 0) && ((data
->rvo
+ data
->currvid
) > reqvid
)) {
302 if (data
->currvid
== maxvid
) {
305 dprintk("ph1: changing vid for rvo, req 0x%x\n",
307 if (decrease_vid_code_by_step(data
, data
->currvid
- 1, 1))
313 if (query_current_values_with_pending_wait(data
))
316 if (savefid
!= data
->currfid
) {
317 printk(KERN_ERR PFX
"ph1 err, currfid changed 0x%x\n", data
->currfid
);
321 dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
322 data
->currfid
, data
->currvid
);
327 /* Phase 2 - core frequency transition */
328 static int core_frequency_transition(struct powernow_k8_data
*data
, u32 reqfid
)
330 u32 vcoreqfid
, vcocurrfid
, vcofiddiff
, savevid
= data
->currvid
;
332 if ((reqfid
< HI_FID_TABLE_BOTTOM
) && (data
->currfid
< HI_FID_TABLE_BOTTOM
)) {
333 printk(KERN_ERR PFX
"ph2: illegal lo-lo transition 0x%x 0x%x\n",
334 reqfid
, data
->currfid
);
338 if (data
->currfid
== reqfid
) {
339 printk(KERN_ERR PFX
"ph2 null fid transition 0x%x\n", data
->currfid
);
343 dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
345 data
->currfid
, data
->currvid
, reqfid
);
347 vcoreqfid
= convert_fid_to_vco_fid(reqfid
);
348 vcocurrfid
= convert_fid_to_vco_fid(data
->currfid
);
349 vcofiddiff
= vcocurrfid
> vcoreqfid
? vcocurrfid
- vcoreqfid
350 : vcoreqfid
- vcocurrfid
;
352 while (vcofiddiff
> 2) {
353 if (reqfid
> data
->currfid
) {
354 if (data
->currfid
> LO_FID_TABLE_TOP
) {
355 if (write_new_fid(data
, data
->currfid
+ 2)) {
360 (data
, 2 + convert_fid_to_vco_fid(data
->currfid
))) {
365 if (write_new_fid(data
, data
->currfid
- 2))
369 vcocurrfid
= convert_fid_to_vco_fid(data
->currfid
);
370 vcofiddiff
= vcocurrfid
> vcoreqfid
? vcocurrfid
- vcoreqfid
371 : vcoreqfid
- vcocurrfid
;
374 if (write_new_fid(data
, reqfid
))
377 if (query_current_values_with_pending_wait(data
))
380 if (data
->currfid
!= reqfid
) {
382 "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
383 data
->currfid
, reqfid
);
387 if (savevid
!= data
->currvid
) {
388 printk(KERN_ERR PFX
"ph2: vid changed, save 0x%x, curr 0x%x\n",
389 savevid
, data
->currvid
);
393 dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
394 data
->currfid
, data
->currvid
);
399 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
400 static int core_voltage_post_transition(struct powernow_k8_data
*data
, u32 reqvid
)
402 u32 savefid
= data
->currfid
;
403 u32 savereqvid
= reqvid
;
405 dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
407 data
->currfid
, data
->currvid
);
409 if (reqvid
!= data
->currvid
) {
410 if (write_new_vid(data
, reqvid
))
413 if (savefid
!= data
->currfid
) {
415 "ph3: bad fid change, save 0x%x, curr 0x%x\n",
416 savefid
, data
->currfid
);
420 if (data
->currvid
!= reqvid
) {
422 "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
423 reqvid
, data
->currvid
);
428 if (query_current_values_with_pending_wait(data
))
431 if (savereqvid
!= data
->currvid
) {
432 dprintk("ph3 failed, currvid 0x%x\n", data
->currvid
);
436 if (savefid
!= data
->currfid
) {
437 dprintk("ph3 failed, currfid changed 0x%x\n",
442 dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
443 data
->currfid
, data
->currvid
);
448 static int check_supported_cpu(unsigned int cpu
)
450 cpumask_t oldmask
= CPU_MASK_ALL
;
451 u32 eax
, ebx
, ecx
, edx
;
454 oldmask
= current
->cpus_allowed
;
455 set_cpus_allowed(current
, cpumask_of_cpu(cpu
));
458 if (smp_processor_id() != cpu
) {
459 printk(KERN_ERR
"limiting to cpu %u failed\n", cpu
);
463 if (current_cpu_data
.x86_vendor
!= X86_VENDOR_AMD
)
466 eax
= cpuid_eax(CPUID_PROCESSOR_SIGNATURE
);
467 if (((eax
& CPUID_USE_XFAM_XMOD
) != CPUID_USE_XFAM_XMOD
) ||
468 ((eax
& CPUID_XFAM
) != CPUID_XFAM_K8
) ||
469 ((eax
& CPUID_XMOD
) > CPUID_XMOD_REV_E
)) {
470 printk(KERN_INFO PFX
"Processor cpuid %x not supported\n", eax
);
474 eax
= cpuid_eax(CPUID_GET_MAX_CAPABILITIES
);
475 if (eax
< CPUID_FREQ_VOLT_CAPABILITIES
) {
477 "No frequency change capabilities detected\n");
481 cpuid(CPUID_FREQ_VOLT_CAPABILITIES
, &eax
, &ebx
, &ecx
, &edx
);
482 if ((edx
& P_STATE_TRANSITION_CAPABLE
) != P_STATE_TRANSITION_CAPABLE
) {
483 printk(KERN_INFO PFX
"Power state transitions not supported\n");
490 set_cpus_allowed(current
, oldmask
);
496 static int check_pst_table(struct powernow_k8_data
*data
, struct pst_s
*pst
, u8 maxvid
)
501 for (j
= 0; j
< data
->numps
; j
++) {
502 if (pst
[j
].vid
> LEAST_VID
) {
503 printk(KERN_ERR PFX
"vid %d invalid : 0x%x\n", j
, pst
[j
].vid
);
506 if (pst
[j
].vid
< data
->rvo
) { /* vid + rvo >= 0 */
507 printk(KERN_ERR BFX
"0 vid exceeded with pstate %d\n", j
);
510 if (pst
[j
].vid
< maxvid
+ data
->rvo
) { /* vid + rvo >= maxvid */
511 printk(KERN_ERR BFX
"maxvid exceeded with pstate %d\n", j
);
514 if ((pst
[j
].fid
> MAX_FID
)
516 || (j
&& (pst
[j
].fid
< HI_FID_TABLE_BOTTOM
))) {
517 /* Only first fid is allowed to be in "low" range */
518 printk(KERN_ERR PFX
"two low fids - %d : 0x%x\n", j
, pst
[j
].fid
);
521 if (pst
[j
].fid
< lastfid
)
522 lastfid
= pst
[j
].fid
;
525 printk(KERN_ERR PFX
"lastfid invalid\n");
528 if (lastfid
> LO_FID_TABLE_TOP
)
529 printk(KERN_INFO PFX
"first fid not from lo freq table\n");
534 static void print_basics(struct powernow_k8_data
*data
)
537 for (j
= 0; j
< data
->numps
; j
++) {
538 if (data
->powernow_table
[j
].frequency
!= CPUFREQ_ENTRY_INVALID
)
539 printk(KERN_INFO PFX
" %d : fid 0x%x (%d MHz), vid 0x%x (%d mV)\n", j
,
540 data
->powernow_table
[j
].index
& 0xff,
541 data
->powernow_table
[j
].frequency
/1000,
542 data
->powernow_table
[j
].index
>> 8,
543 find_millivolts_from_vid(data
, data
->powernow_table
[j
].index
>> 8));
546 printk(KERN_INFO PFX
"Only %d pstates on battery\n", data
->batps
);
549 static int fill_powernow_table(struct powernow_k8_data
*data
, struct pst_s
*pst
, u8 maxvid
)
551 struct cpufreq_frequency_table
*powernow_table
;
554 if (data
->batps
) { /* use ACPI support to get full speed on mains power */
555 printk(KERN_WARNING PFX
"Only %d pstates usable (use ACPI driver for full range\n", data
->batps
);
556 data
->numps
= data
->batps
;
559 for ( j
=1; j
<data
->numps
; j
++ ) {
560 if (pst
[j
-1].fid
>= pst
[j
].fid
) {
561 printk(KERN_ERR PFX
"PST out of sequence\n");
566 if (data
->numps
< 2) {
567 printk(KERN_ERR PFX
"no p states to transition\n");
571 if (check_pst_table(data
, pst
, maxvid
))
574 powernow_table
= kmalloc((sizeof(struct cpufreq_frequency_table
)
575 * (data
->numps
+ 1)), GFP_KERNEL
);
576 if (!powernow_table
) {
577 printk(KERN_ERR PFX
"powernow_table memory alloc failure\n");
581 for (j
= 0; j
< data
->numps
; j
++) {
582 powernow_table
[j
].index
= pst
[j
].fid
; /* lower 8 bits */
583 powernow_table
[j
].index
|= (pst
[j
].vid
<< 8); /* upper 8 bits */
584 powernow_table
[j
].frequency
= find_khz_freq_from_fid(pst
[j
].fid
);
586 powernow_table
[data
->numps
].frequency
= CPUFREQ_TABLE_END
;
587 powernow_table
[data
->numps
].index
= 0;
589 if (query_current_values_with_pending_wait(data
)) {
590 kfree(powernow_table
);
594 dprintk("cfid 0x%x, cvid 0x%x\n", data
->currfid
, data
->currvid
);
595 data
->powernow_table
= powernow_table
;
598 for (j
= 0; j
< data
->numps
; j
++)
599 if ((pst
[j
].fid
==data
->currfid
) && (pst
[j
].vid
==data
->currvid
))
602 dprintk("currfid/vid do not match PST, ignoring\n");
606 /* Find and validate the PSB/PST table in BIOS. */
607 static int find_psb_table(struct powernow_k8_data
*data
)
616 for (i
= 0xc0000; i
< 0xffff0; i
+= 0x10) {
617 /* Scan BIOS looking for the signature. */
618 /* It can not be at ffff0 - it is too big. */
620 psb
= phys_to_virt(i
);
621 if (memcmp(psb
, PSB_ID_STRING
, PSB_ID_STRING_LEN
) != 0)
624 dprintk("found PSB header at 0x%p\n", psb
);
626 dprintk("table vers: 0x%x\n", psb
->tableversion
);
627 if (psb
->tableversion
!= PSB_VERSION_1_4
) {
628 printk(KERN_INFO BFX
"PSB table is not v1.4\n");
632 dprintk("flags: 0x%x\n", psb
->flags1
);
634 printk(KERN_ERR BFX
"unknown flags\n");
638 data
->vstable
= psb
->vstable
;
639 dprintk("voltage stabilization time: %d(*20us)\n", data
->vstable
);
641 dprintk("flags2: 0x%x\n", psb
->flags2
);
642 data
->rvo
= psb
->flags2
& 3;
643 data
->irt
= ((psb
->flags2
) >> 2) & 3;
644 mvs
= ((psb
->flags2
) >> 4) & 3;
645 data
->vidmvs
= 1 << mvs
;
646 data
->batps
= ((psb
->flags2
) >> 6) & 3;
648 dprintk("ramp voltage offset: %d\n", data
->rvo
);
649 dprintk("isochronous relief time: %d\n", data
->irt
);
650 dprintk("maximum voltage step: %d - 0x%x\n", mvs
, data
->vidmvs
);
652 dprintk("numpst: 0x%x\n", psb
->num_tables
);
653 cpst
= psb
->num_tables
;
654 if ((psb
->cpuid
== 0x00000fc0) || (psb
->cpuid
== 0x00000fe0) ){
655 thiscpuid
= cpuid_eax(CPUID_PROCESSOR_SIGNATURE
);
656 if ((thiscpuid
== 0x00000fc0) || (thiscpuid
== 0x00000fe0) ) {
661 printk(KERN_ERR BFX
"numpst must be 1\n");
665 data
->plllock
= psb
->plllocktime
;
666 dprintk("plllocktime: 0x%x (units 1us)\n", psb
->plllocktime
);
667 dprintk("maxfid: 0x%x\n", psb
->maxfid
);
668 dprintk("maxvid: 0x%x\n", psb
->maxvid
);
669 maxvid
= psb
->maxvid
;
671 data
->numps
= psb
->numps
;
672 dprintk("numpstates: 0x%x\n", data
->numps
);
673 return fill_powernow_table(data
, (struct pst_s
*)(psb
+1), maxvid
);
676 * If you see this message, complain to BIOS manufacturer. If
677 * he tells you "we do not support Linux" or some similar
678 * nonsense, remember that Windows 2000 uses the same legacy
679 * mechanism that the old Linux PSB driver uses. Tell them it
680 * is broken with Windows 2000.
682 * The reference to the AMD documentation is chapter 9 in the
683 * BIOS and Kernel Developer's Guide, which is available on
686 printk(KERN_INFO PFX
"BIOS error - no PSB or ACPI _PSS objects\n");
690 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
691 static void powernow_k8_acpi_pst_values(struct powernow_k8_data
*data
, unsigned int index
)
693 if (!data
->acpi_data
.state_count
)
696 data
->irt
= (data
->acpi_data
.states
[index
].control
>> IRT_SHIFT
) & IRT_MASK
;
697 data
->rvo
= (data
->acpi_data
.states
[index
].control
>> RVO_SHIFT
) & RVO_MASK
;
698 data
->plllock
= (data
->acpi_data
.states
[index
].control
>> PLL_L_SHIFT
) & PLL_L_MASK
;
699 data
->vidmvs
= 1 << ((data
->acpi_data
.states
[index
].control
>> MVS_SHIFT
) & MVS_MASK
);
700 data
->vstable
= (data
->acpi_data
.states
[index
].control
>> VST_SHIFT
) & VST_MASK
;
703 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data
*data
)
707 struct cpufreq_frequency_table
*powernow_table
;
709 if (acpi_processor_register_performance(&data
->acpi_data
, data
->cpu
)) {
710 dprintk("register performance failed: bad ACPI data\n");
714 /* verify the data contained in the ACPI structures */
715 if (data
->acpi_data
.state_count
<= 1) {
716 dprintk("No ACPI P-States\n");
720 if ((data
->acpi_data
.control_register
.space_id
!= ACPI_ADR_SPACE_FIXED_HARDWARE
) ||
721 (data
->acpi_data
.status_register
.space_id
!= ACPI_ADR_SPACE_FIXED_HARDWARE
)) {
722 dprintk("Invalid control/status registers (%x - %x)\n",
723 data
->acpi_data
.control_register
.space_id
,
724 data
->acpi_data
.status_register
.space_id
);
728 /* fill in data->powernow_table */
729 powernow_table
= kmalloc((sizeof(struct cpufreq_frequency_table
)
730 * (data
->acpi_data
.state_count
+ 1)), GFP_KERNEL
);
731 if (!powernow_table
) {
732 dprintk("powernow_table memory alloc failure\n");
736 for (i
= 0; i
< data
->acpi_data
.state_count
; i
++) {
737 u32 fid
= data
->acpi_data
.states
[i
].control
& FID_MASK
;
738 u32 vid
= (data
->acpi_data
.states
[i
].control
>> VID_SHIFT
) & VID_MASK
;
740 dprintk(" %d : fid 0x%x, vid 0x%x\n", i
, fid
, vid
);
742 powernow_table
[i
].index
= fid
; /* lower 8 bits */
743 powernow_table
[i
].index
|= (vid
<< 8); /* upper 8 bits */
744 powernow_table
[i
].frequency
= find_khz_freq_from_fid(fid
);
746 /* verify frequency is OK */
747 if ((powernow_table
[i
].frequency
> (MAX_FREQ
* 1000)) ||
748 (powernow_table
[i
].frequency
< (MIN_FREQ
* 1000))) {
749 dprintk("invalid freq %u kHz, ignoring\n", powernow_table
[i
].frequency
);
750 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
754 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
756 dprintk("invalid vid %u, ignoring\n", vid
);
757 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
761 /* verify only 1 entry from the lo frequency table */
762 if (fid
< HI_FID_TABLE_BOTTOM
) {
764 /* if both entries are the same, ignore this
767 if ((powernow_table
[i
].frequency
!= powernow_table
[cntlofreq
].frequency
) ||
768 (powernow_table
[i
].index
!= powernow_table
[cntlofreq
].index
)) {
769 printk(KERN_ERR PFX
"Too many lo freq table entries\n");
773 dprintk("double low frequency table entry, ignoring it.\n");
774 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
780 if (powernow_table
[i
].frequency
!= (data
->acpi_data
.states
[i
].core_frequency
* 1000)) {
781 printk(KERN_INFO PFX
"invalid freq entries %u kHz vs. %u kHz\n",
782 powernow_table
[i
].frequency
,
783 (unsigned int) (data
->acpi_data
.states
[i
].core_frequency
* 1000));
784 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
789 powernow_table
[data
->acpi_data
.state_count
].frequency
= CPUFREQ_TABLE_END
;
790 powernow_table
[data
->acpi_data
.state_count
].index
= 0;
791 data
->powernow_table
= powernow_table
;
794 data
->numps
= data
->acpi_data
.state_count
;
796 powernow_k8_acpi_pst_values(data
, 0);
798 /* notify BIOS that we exist */
799 acpi_processor_notify_smm(THIS_MODULE
);
804 kfree(powernow_table
);
807 acpi_processor_unregister_performance(&data
->acpi_data
, data
->cpu
);
809 /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
810 data
->acpi_data
.state_count
= 0;
815 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data
*data
)
817 if (data
->acpi_data
.state_count
)
818 acpi_processor_unregister_performance(&data
->acpi_data
, data
->cpu
);
822 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data
*data
) { return -ENODEV
; }
823 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data
*data
) { return; }
824 static void powernow_k8_acpi_pst_values(struct powernow_k8_data
*data
, unsigned int index
) { return; }
825 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
827 /* Take a frequency, and issue the fid/vid transition command */
828 static int transition_frequency(struct powernow_k8_data
*data
, unsigned int index
)
833 struct cpufreq_freqs freqs
;
835 dprintk("cpu %d transition to index %u\n", smp_processor_id(), index
);
837 /* fid are the lower 8 bits of the index we stored into
838 * the cpufreq frequency table in find_psb_table, vid are
842 fid
= data
->powernow_table
[index
].index
& 0xFF;
843 vid
= (data
->powernow_table
[index
].index
& 0xFF00) >> 8;
845 dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid
, vid
);
847 if (query_current_values_with_pending_wait(data
))
850 if ((data
->currvid
== vid
) && (data
->currfid
== fid
)) {
851 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
856 if ((fid
< HI_FID_TABLE_BOTTOM
) && (data
->currfid
< HI_FID_TABLE_BOTTOM
)) {
858 "ignoring illegal change in lo freq table-%x to 0x%x\n",
863 dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
864 smp_processor_id(), fid
, vid
);
866 freqs
.cpu
= data
->cpu
;
867 freqs
.old
= find_khz_freq_from_fid(data
->currfid
);
868 freqs
.new = find_khz_freq_from_fid(fid
);
869 for_each_cpu_mask(i
, cpu_core_map
[data
->cpu
]) {
871 cpufreq_notify_transition(&freqs
, CPUFREQ_PRECHANGE
);
874 res
= transition_fid_vid(data
, fid
, vid
);
876 freqs
.new = find_khz_freq_from_fid(data
->currfid
);
877 for_each_cpu_mask(i
, cpu_core_map
[data
->cpu
]) {
879 cpufreq_notify_transition(&freqs
, CPUFREQ_POSTCHANGE
);
884 /* Driver entry point to switch to the target frequency */
885 static int powernowk8_target(struct cpufreq_policy
*pol
, unsigned targfreq
, unsigned relation
)
887 cpumask_t oldmask
= CPU_MASK_ALL
;
888 struct powernow_k8_data
*data
= powernow_data
[pol
->cpu
];
889 u32 checkfid
= data
->currfid
;
890 u32 checkvid
= data
->currvid
;
891 unsigned int newstate
;
895 /* only run on specific CPU from here on */
896 oldmask
= current
->cpus_allowed
;
897 set_cpus_allowed(current
, cpumask_of_cpu(pol
->cpu
));
900 if (smp_processor_id() != pol
->cpu
) {
901 printk(KERN_ERR
"limiting to cpu %u failed\n", pol
->cpu
);
905 if (pending_bit_stuck()) {
906 printk(KERN_ERR PFX
"failing targ, change pending bit set\n");
910 dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
911 pol
->cpu
, targfreq
, pol
->min
, pol
->max
, relation
);
913 if (query_current_values_with_pending_wait(data
)) {
918 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
919 data
->currfid
, data
->currvid
);
921 if ((checkvid
!= data
->currvid
) || (checkfid
!= data
->currfid
)) {
923 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
924 checkfid
, data
->currfid
, checkvid
, data
->currvid
);
927 if (cpufreq_frequency_table_target(pol
, data
->powernow_table
, targfreq
, relation
, &newstate
))
932 for_each_cpu_mask(i
, cpu_core_map
[pol
->cpu
]) {
933 /* make sure the sibling is initialized */
934 if (!powernow_data
[i
]) {
941 powernow_k8_acpi_pst_values(data
, newstate
);
943 if (transition_frequency(data
, newstate
)) {
944 printk(KERN_ERR PFX
"transition frequency failed\n");
950 /* Update all the fid/vids of our siblings */
951 for_each_cpu_mask(i
, cpu_core_map
[pol
->cpu
]) {
952 powernow_data
[i
]->currvid
= data
->currvid
;
953 powernow_data
[i
]->currfid
= data
->currfid
;
957 pol
->cur
= find_khz_freq_from_fid(data
->currfid
);
961 set_cpus_allowed(current
, oldmask
);
967 /* Driver entry point to verify the policy and range of frequencies */
968 static int powernowk8_verify(struct cpufreq_policy
*pol
)
970 struct powernow_k8_data
*data
= powernow_data
[pol
->cpu
];
972 return cpufreq_frequency_table_verify(pol
, data
->powernow_table
);
975 /* per CPU init entry point to the driver */
976 static int __init
powernowk8_cpu_init(struct cpufreq_policy
*pol
)
978 struct powernow_k8_data
*data
;
979 cpumask_t oldmask
= CPU_MASK_ALL
;
982 if (!check_supported_cpu(pol
->cpu
))
985 data
= kmalloc(sizeof(struct powernow_k8_data
), GFP_KERNEL
);
987 printk(KERN_ERR PFX
"unable to alloc powernow_k8_data");
990 memset(data
,0,sizeof(struct powernow_k8_data
));
992 data
->cpu
= pol
->cpu
;
994 if (powernow_k8_cpu_init_acpi(data
)) {
996 * Use the PSB BIOS structure. This is only availabe on
997 * an UP version, and is deprecated by AMD.
1000 if ((num_online_cpus() != 1) || (num_possible_cpus() != 1)) {
1001 printk(KERN_ERR PFX
"MP systems not supported by PSB BIOS structure\n");
1005 if (pol
->cpu
!= 0) {
1006 printk(KERN_ERR PFX
"init not cpu 0\n");
1010 rc
= find_psb_table(data
);
1017 /* only run on specific CPU from here on */
1018 oldmask
= current
->cpus_allowed
;
1019 set_cpus_allowed(current
, cpumask_of_cpu(pol
->cpu
));
1022 if (smp_processor_id() != pol
->cpu
) {
1023 printk(KERN_ERR
"limiting to cpu %u failed\n", pol
->cpu
);
1027 if (pending_bit_stuck()) {
1028 printk(KERN_ERR PFX
"failing init, change pending bit set\n");
1032 if (query_current_values_with_pending_wait(data
))
1037 /* run on any CPU again */
1038 set_cpus_allowed(current
, oldmask
);
1041 pol
->governor
= CPUFREQ_DEFAULT_GOVERNOR
;
1042 pol
->cpus
= cpu_core_map
[pol
->cpu
];
1044 /* Take a crude guess here.
1045 * That guess was in microseconds, so multiply with 1000 */
1046 pol
->cpuinfo
.transition_latency
= (((data
->rvo
+ 8) * data
->vstable
* VST_UNITS_20US
)
1047 + (3 * (1 << data
->irt
) * 10)) * 1000;
1049 pol
->cur
= find_khz_freq_from_fid(data
->currfid
);
1050 dprintk("policy current frequency %d kHz\n", pol
->cur
);
1052 /* min/max the cpu is capable of */
1053 if (cpufreq_frequency_table_cpuinfo(pol
, data
->powernow_table
)) {
1054 printk(KERN_ERR PFX
"invalid powernow_table\n");
1055 powernow_k8_cpu_exit_acpi(data
);
1056 kfree(data
->powernow_table
);
1061 cpufreq_frequency_table_get_attr(data
->powernow_table
, pol
->cpu
);
1063 printk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1064 data
->currfid
, data
->currvid
);
1066 powernow_data
[pol
->cpu
] = data
;
1071 set_cpus_allowed(current
, oldmask
);
1073 powernow_k8_cpu_exit_acpi(data
);
1079 static int __devexit
powernowk8_cpu_exit (struct cpufreq_policy
*pol
)
1081 struct powernow_k8_data
*data
= powernow_data
[pol
->cpu
];
1086 powernow_k8_cpu_exit_acpi(data
);
1088 cpufreq_frequency_table_put_attr(pol
->cpu
);
1090 kfree(data
->powernow_table
);
1096 static unsigned int powernowk8_get (unsigned int cpu
)
1098 struct powernow_k8_data
*data
= powernow_data
[cpu
];
1099 cpumask_t oldmask
= current
->cpus_allowed
;
1100 unsigned int khz
= 0;
1102 set_cpus_allowed(current
, cpumask_of_cpu(cpu
));
1103 if (smp_processor_id() != cpu
) {
1104 printk(KERN_ERR PFX
"limiting to CPU %d failed in powernowk8_get\n", cpu
);
1105 set_cpus_allowed(current
, oldmask
);
1110 if (query_current_values_with_pending_wait(data
))
1113 khz
= find_khz_freq_from_fid(data
->currfid
);
1116 preempt_enable_no_resched();
1117 set_cpus_allowed(current
, oldmask
);
1122 static struct freq_attr
* powernow_k8_attr
[] = {
1123 &cpufreq_freq_attr_scaling_available_freqs
,
1127 static struct cpufreq_driver cpufreq_amd64_driver
= {
1128 .verify
= powernowk8_verify
,
1129 .target
= powernowk8_target
,
1130 .init
= powernowk8_cpu_init
,
1131 .exit
= __devexit_p(powernowk8_cpu_exit
),
1132 .get
= powernowk8_get
,
1133 .name
= "powernow-k8",
1134 .owner
= THIS_MODULE
,
1135 .attr
= powernow_k8_attr
,
1138 /* driver entry point for init */
1139 static int __init
powernowk8_init(void)
1141 unsigned int i
, supported_cpus
= 0;
1143 for (i
=0; i
<NR_CPUS
; i
++) {
1146 if (check_supported_cpu(i
))
1150 if (supported_cpus
== num_online_cpus()) {
1151 printk(KERN_INFO PFX
"Found %d AMD Athlon 64 / Opteron processors (" VERSION
")\n",
1153 return cpufreq_register_driver(&cpufreq_amd64_driver
);
1159 /* driver entry point for term */
1160 static void __exit
powernowk8_exit(void)
1164 cpufreq_unregister_driver(&cpufreq_amd64_driver
);
1167 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com.");
1168 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1169 MODULE_LICENSE("GPL");
1171 late_initcall(powernowk8_init
);
1172 module_exit(powernowk8_exit
);