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 1.60.0"
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
, fid_interval
, 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 (data
->currfid
& 1) ? (fid_interval
= 1) : (fid_interval
= 2);
364 if (reqfid
> data
->currfid
) {
365 if (data
->currfid
> LO_FID_TABLE_TOP
) {
366 if (write_new_fid(data
, data
->currfid
+ fid_interval
)) {
371 (data
, 2 + convert_fid_to_vco_fid(data
->currfid
))) {
376 if (write_new_fid(data
, data
->currfid
- fid_interval
))
380 vcocurrfid
= convert_fid_to_vco_fid(data
->currfid
);
381 vcofiddiff
= vcocurrfid
> vcoreqfid
? vcocurrfid
- vcoreqfid
382 : vcoreqfid
- vcocurrfid
;
385 if (write_new_fid(data
, reqfid
))
388 if (query_current_values_with_pending_wait(data
))
391 if (data
->currfid
!= reqfid
) {
393 "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
394 data
->currfid
, reqfid
);
398 if (savevid
!= data
->currvid
) {
399 printk(KERN_ERR PFX
"ph2: vid changed, save 0x%x, curr 0x%x\n",
400 savevid
, data
->currvid
);
404 dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
405 data
->currfid
, data
->currvid
);
410 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
411 static int core_voltage_post_transition(struct powernow_k8_data
*data
, u32 reqvid
)
413 u32 savefid
= data
->currfid
;
414 u32 savereqvid
= reqvid
;
416 dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
418 data
->currfid
, data
->currvid
);
420 if (reqvid
!= data
->currvid
) {
421 if (write_new_vid(data
, reqvid
))
424 if (savefid
!= data
->currfid
) {
426 "ph3: bad fid change, save 0x%x, curr 0x%x\n",
427 savefid
, data
->currfid
);
431 if (data
->currvid
!= reqvid
) {
433 "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
434 reqvid
, data
->currvid
);
439 if (query_current_values_with_pending_wait(data
))
442 if (savereqvid
!= data
->currvid
) {
443 dprintk("ph3 failed, currvid 0x%x\n", data
->currvid
);
447 if (savefid
!= data
->currfid
) {
448 dprintk("ph3 failed, currfid changed 0x%x\n",
453 dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
454 data
->currfid
, data
->currvid
);
459 static int check_supported_cpu(unsigned int cpu
)
461 cpumask_t oldmask
= CPU_MASK_ALL
;
462 u32 eax
, ebx
, ecx
, edx
;
465 oldmask
= current
->cpus_allowed
;
466 set_cpus_allowed(current
, cpumask_of_cpu(cpu
));
468 if (smp_processor_id() != cpu
) {
469 printk(KERN_ERR PFX
"limiting to cpu %u failed\n", cpu
);
473 if (current_cpu_data
.x86_vendor
!= X86_VENDOR_AMD
)
476 eax
= cpuid_eax(CPUID_PROCESSOR_SIGNATURE
);
477 if (((eax
& CPUID_USE_XFAM_XMOD
) != CPUID_USE_XFAM_XMOD
) ||
478 ((eax
& CPUID_XFAM
) != CPUID_XFAM_K8
) ||
479 ((eax
& CPUID_XMOD
) > CPUID_XMOD_REV_G
)) {
480 printk(KERN_INFO PFX
"Processor cpuid %x not supported\n", eax
);
484 eax
= cpuid_eax(CPUID_GET_MAX_CAPABILITIES
);
485 if (eax
< CPUID_FREQ_VOLT_CAPABILITIES
) {
487 "No frequency change capabilities detected\n");
491 cpuid(CPUID_FREQ_VOLT_CAPABILITIES
, &eax
, &ebx
, &ecx
, &edx
);
492 if ((edx
& P_STATE_TRANSITION_CAPABLE
) != P_STATE_TRANSITION_CAPABLE
) {
493 printk(KERN_INFO PFX
"Power state transitions not supported\n");
500 set_cpus_allowed(current
, oldmask
);
504 static int check_pst_table(struct powernow_k8_data
*data
, struct pst_s
*pst
, u8 maxvid
)
509 for (j
= 0; j
< data
->numps
; j
++) {
510 if (pst
[j
].vid
> LEAST_VID
) {
511 printk(KERN_ERR PFX
"vid %d invalid : 0x%x\n", j
, pst
[j
].vid
);
514 if (pst
[j
].vid
< data
->rvo
) { /* vid + rvo >= 0 */
515 printk(KERN_ERR BFX
"0 vid exceeded with pstate %d\n", j
);
518 if (pst
[j
].vid
< maxvid
+ data
->rvo
) { /* vid + rvo >= maxvid */
519 printk(KERN_ERR BFX
"maxvid exceeded with pstate %d\n", j
);
522 if (pst
[j
].fid
> MAX_FID
) {
523 printk(KERN_ERR BFX
"maxfid exceeded with pstate %d\n", j
);
526 if (j
&& (pst
[j
].fid
< HI_FID_TABLE_BOTTOM
)) {
527 /* Only first fid is allowed to be in "low" range */
528 printk(KERN_ERR BFX
"two low fids - %d : 0x%x\n", j
, pst
[j
].fid
);
531 if (pst
[j
].fid
< lastfid
)
532 lastfid
= pst
[j
].fid
;
535 printk(KERN_ERR BFX
"lastfid invalid\n");
538 if (lastfid
> LO_FID_TABLE_TOP
)
539 printk(KERN_INFO BFX
"first fid not from lo freq table\n");
544 static void print_basics(struct powernow_k8_data
*data
)
547 for (j
= 0; j
< data
->numps
; j
++) {
548 if (data
->powernow_table
[j
].frequency
!= CPUFREQ_ENTRY_INVALID
)
549 printk(KERN_INFO PFX
" %d : fid 0x%x (%d MHz), vid 0x%x (%d mV)\n", j
,
550 data
->powernow_table
[j
].index
& 0xff,
551 data
->powernow_table
[j
].frequency
/1000,
552 data
->powernow_table
[j
].index
>> 8,
553 find_millivolts_from_vid(data
, data
->powernow_table
[j
].index
>> 8));
556 printk(KERN_INFO PFX
"Only %d pstates on battery\n", data
->batps
);
559 static int fill_powernow_table(struct powernow_k8_data
*data
, struct pst_s
*pst
, u8 maxvid
)
561 struct cpufreq_frequency_table
*powernow_table
;
564 if (data
->batps
) { /* use ACPI support to get full speed on mains power */
565 printk(KERN_WARNING PFX
"Only %d pstates usable (use ACPI driver for full range\n", data
->batps
);
566 data
->numps
= data
->batps
;
569 for ( j
=1; j
<data
->numps
; j
++ ) {
570 if (pst
[j
-1].fid
>= pst
[j
].fid
) {
571 printk(KERN_ERR PFX
"PST out of sequence\n");
576 if (data
->numps
< 2) {
577 printk(KERN_ERR PFX
"no p states to transition\n");
581 if (check_pst_table(data
, pst
, maxvid
))
584 powernow_table
= kmalloc((sizeof(struct cpufreq_frequency_table
)
585 * (data
->numps
+ 1)), GFP_KERNEL
);
586 if (!powernow_table
) {
587 printk(KERN_ERR PFX
"powernow_table memory alloc failure\n");
591 for (j
= 0; j
< data
->numps
; j
++) {
592 powernow_table
[j
].index
= pst
[j
].fid
; /* lower 8 bits */
593 powernow_table
[j
].index
|= (pst
[j
].vid
<< 8); /* upper 8 bits */
594 powernow_table
[j
].frequency
= find_khz_freq_from_fid(pst
[j
].fid
);
596 powernow_table
[data
->numps
].frequency
= CPUFREQ_TABLE_END
;
597 powernow_table
[data
->numps
].index
= 0;
599 if (query_current_values_with_pending_wait(data
)) {
600 kfree(powernow_table
);
604 dprintk("cfid 0x%x, cvid 0x%x\n", data
->currfid
, data
->currvid
);
605 data
->powernow_table
= powernow_table
;
608 for (j
= 0; j
< data
->numps
; j
++)
609 if ((pst
[j
].fid
==data
->currfid
) && (pst
[j
].vid
==data
->currvid
))
612 dprintk("currfid/vid do not match PST, ignoring\n");
616 /* Find and validate the PSB/PST table in BIOS. */
617 static int find_psb_table(struct powernow_k8_data
*data
)
626 for (i
= 0xc0000; i
< 0xffff0; i
+= 0x10) {
627 /* Scan BIOS looking for the signature. */
628 /* It can not be at ffff0 - it is too big. */
630 psb
= phys_to_virt(i
);
631 if (memcmp(psb
, PSB_ID_STRING
, PSB_ID_STRING_LEN
) != 0)
634 dprintk("found PSB header at 0x%p\n", psb
);
636 dprintk("table vers: 0x%x\n", psb
->tableversion
);
637 if (psb
->tableversion
!= PSB_VERSION_1_4
) {
638 printk(KERN_ERR BFX
"PSB table is not v1.4\n");
642 dprintk("flags: 0x%x\n", psb
->flags1
);
644 printk(KERN_ERR BFX
"unknown flags\n");
648 data
->vstable
= psb
->vstable
;
649 dprintk("voltage stabilization time: %d(*20us)\n", data
->vstable
);
651 dprintk("flags2: 0x%x\n", psb
->flags2
);
652 data
->rvo
= psb
->flags2
& 3;
653 data
->irt
= ((psb
->flags2
) >> 2) & 3;
654 mvs
= ((psb
->flags2
) >> 4) & 3;
655 data
->vidmvs
= 1 << mvs
;
656 data
->batps
= ((psb
->flags2
) >> 6) & 3;
658 dprintk("ramp voltage offset: %d\n", data
->rvo
);
659 dprintk("isochronous relief time: %d\n", data
->irt
);
660 dprintk("maximum voltage step: %d - 0x%x\n", mvs
, data
->vidmvs
);
662 dprintk("numpst: 0x%x\n", psb
->num_tables
);
663 cpst
= psb
->num_tables
;
664 if ((psb
->cpuid
== 0x00000fc0) || (psb
->cpuid
== 0x00000fe0) ){
665 thiscpuid
= cpuid_eax(CPUID_PROCESSOR_SIGNATURE
);
666 if ((thiscpuid
== 0x00000fc0) || (thiscpuid
== 0x00000fe0) ) {
671 printk(KERN_ERR BFX
"numpst must be 1\n");
675 data
->plllock
= psb
->plllocktime
;
676 dprintk("plllocktime: 0x%x (units 1us)\n", psb
->plllocktime
);
677 dprintk("maxfid: 0x%x\n", psb
->maxfid
);
678 dprintk("maxvid: 0x%x\n", psb
->maxvid
);
679 maxvid
= psb
->maxvid
;
681 data
->numps
= psb
->numps
;
682 dprintk("numpstates: 0x%x\n", data
->numps
);
683 return fill_powernow_table(data
, (struct pst_s
*)(psb
+1), maxvid
);
686 * If you see this message, complain to BIOS manufacturer. If
687 * he tells you "we do not support Linux" or some similar
688 * nonsense, remember that Windows 2000 uses the same legacy
689 * mechanism that the old Linux PSB driver uses. Tell them it
690 * is broken with Windows 2000.
692 * The reference to the AMD documentation is chapter 9 in the
693 * BIOS and Kernel Developer's Guide, which is available on
696 printk(KERN_ERR PFX
"BIOS error - no PSB or ACPI _PSS objects\n");
700 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
701 static void powernow_k8_acpi_pst_values(struct powernow_k8_data
*data
, unsigned int index
)
703 if (!data
->acpi_data
.state_count
)
706 data
->irt
= (data
->acpi_data
.states
[index
].control
>> IRT_SHIFT
) & IRT_MASK
;
707 data
->rvo
= (data
->acpi_data
.states
[index
].control
>> RVO_SHIFT
) & RVO_MASK
;
708 data
->exttype
= (data
->acpi_data
.states
[index
].control
>> EXT_TYPE_SHIFT
) & EXT_TYPE_MASK
;
709 data
->plllock
= (data
->acpi_data
.states
[index
].control
>> PLL_L_SHIFT
) & PLL_L_MASK
;
710 data
->vidmvs
= 1 << ((data
->acpi_data
.states
[index
].control
>> MVS_SHIFT
) & MVS_MASK
);
711 data
->vstable
= (data
->acpi_data
.states
[index
].control
>> VST_SHIFT
) & VST_MASK
;
714 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data
*data
)
718 struct cpufreq_frequency_table
*powernow_table
;
720 if (acpi_processor_register_performance(&data
->acpi_data
, data
->cpu
)) {
721 dprintk("register performance failed: bad ACPI data\n");
725 /* verify the data contained in the ACPI structures */
726 if (data
->acpi_data
.state_count
<= 1) {
727 dprintk("No ACPI P-States\n");
731 if ((data
->acpi_data
.control_register
.space_id
!= ACPI_ADR_SPACE_FIXED_HARDWARE
) ||
732 (data
->acpi_data
.status_register
.space_id
!= ACPI_ADR_SPACE_FIXED_HARDWARE
)) {
733 dprintk("Invalid control/status registers (%x - %x)\n",
734 data
->acpi_data
.control_register
.space_id
,
735 data
->acpi_data
.status_register
.space_id
);
739 /* fill in data->powernow_table */
740 powernow_table
= kmalloc((sizeof(struct cpufreq_frequency_table
)
741 * (data
->acpi_data
.state_count
+ 1)), GFP_KERNEL
);
742 if (!powernow_table
) {
743 dprintk("powernow_table memory alloc failure\n");
747 for (i
= 0; i
< data
->acpi_data
.state_count
; i
++) {
752 fid
= data
->acpi_data
.states
[i
].status
& FID_MASK
;
753 vid
= (data
->acpi_data
.states
[i
].status
>> VID_SHIFT
) & VID_MASK
;
755 fid
= data
->acpi_data
.states
[i
].control
& FID_MASK
;
756 vid
= (data
->acpi_data
.states
[i
].control
>> VID_SHIFT
) & VID_MASK
;
759 dprintk(" %d : fid 0x%x, vid 0x%x\n", i
, fid
, vid
);
761 powernow_table
[i
].index
= fid
; /* lower 8 bits */
762 powernow_table
[i
].index
|= (vid
<< 8); /* upper 8 bits */
763 powernow_table
[i
].frequency
= find_khz_freq_from_fid(fid
);
765 /* verify frequency is OK */
766 if ((powernow_table
[i
].frequency
> (MAX_FREQ
* 1000)) ||
767 (powernow_table
[i
].frequency
< (MIN_FREQ
* 1000))) {
768 dprintk("invalid freq %u kHz, ignoring\n", powernow_table
[i
].frequency
);
769 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
773 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
774 if (vid
== VID_OFF
) {
775 dprintk("invalid vid %u, ignoring\n", vid
);
776 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
780 /* verify only 1 entry from the lo frequency table */
781 if (fid
< HI_FID_TABLE_BOTTOM
) {
783 /* if both entries are the same, ignore this
786 if ((powernow_table
[i
].frequency
!= powernow_table
[cntlofreq
].frequency
) ||
787 (powernow_table
[i
].index
!= powernow_table
[cntlofreq
].index
)) {
788 printk(KERN_ERR PFX
"Too many lo freq table entries\n");
792 dprintk("double low frequency table entry, ignoring it.\n");
793 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
799 if (powernow_table
[i
].frequency
!= (data
->acpi_data
.states
[i
].core_frequency
* 1000)) {
800 printk(KERN_INFO PFX
"invalid freq entries %u kHz vs. %u kHz\n",
801 powernow_table
[i
].frequency
,
802 (unsigned int) (data
->acpi_data
.states
[i
].core_frequency
* 1000));
803 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
808 powernow_table
[data
->acpi_data
.state_count
].frequency
= CPUFREQ_TABLE_END
;
809 powernow_table
[data
->acpi_data
.state_count
].index
= 0;
810 data
->powernow_table
= powernow_table
;
813 data
->numps
= data
->acpi_data
.state_count
;
815 powernow_k8_acpi_pst_values(data
, 0);
817 /* notify BIOS that we exist */
818 acpi_processor_notify_smm(THIS_MODULE
);
823 kfree(powernow_table
);
826 acpi_processor_unregister_performance(&data
->acpi_data
, data
->cpu
);
828 /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
829 data
->acpi_data
.state_count
= 0;
834 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data
*data
)
836 if (data
->acpi_data
.state_count
)
837 acpi_processor_unregister_performance(&data
->acpi_data
, data
->cpu
);
841 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data
*data
) { return -ENODEV
; }
842 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data
*data
) { return; }
843 static void powernow_k8_acpi_pst_values(struct powernow_k8_data
*data
, unsigned int index
) { return; }
844 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
846 /* Take a frequency, and issue the fid/vid transition command */
847 static int transition_frequency(struct powernow_k8_data
*data
, unsigned int index
)
852 struct cpufreq_freqs freqs
;
854 dprintk("cpu %d transition to index %u\n", smp_processor_id(), index
);
856 /* fid are the lower 8 bits of the index we stored into
857 * the cpufreq frequency table in find_psb_table, vid are
861 fid
= data
->powernow_table
[index
].index
& 0xFF;
862 vid
= (data
->powernow_table
[index
].index
& 0xFF00) >> 8;
864 dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid
, vid
);
866 if (query_current_values_with_pending_wait(data
))
869 if ((data
->currvid
== vid
) && (data
->currfid
== fid
)) {
870 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
875 if ((fid
< HI_FID_TABLE_BOTTOM
) && (data
->currfid
< HI_FID_TABLE_BOTTOM
)) {
877 "ignoring illegal change in lo freq table-%x to 0x%x\n",
882 dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
883 smp_processor_id(), fid
, vid
);
885 freqs
.cpu
= data
->cpu
;
886 freqs
.old
= find_khz_freq_from_fid(data
->currfid
);
887 freqs
.new = find_khz_freq_from_fid(fid
);
888 for_each_cpu_mask(i
, cpu_core_map
[data
->cpu
]) {
890 cpufreq_notify_transition(&freqs
, CPUFREQ_PRECHANGE
);
893 res
= transition_fid_vid(data
, fid
, vid
);
895 freqs
.new = find_khz_freq_from_fid(data
->currfid
);
896 for_each_cpu_mask(i
, cpu_core_map
[data
->cpu
]) {
898 cpufreq_notify_transition(&freqs
, CPUFREQ_POSTCHANGE
);
903 /* Driver entry point to switch to the target frequency */
904 static int powernowk8_target(struct cpufreq_policy
*pol
, unsigned targfreq
, unsigned relation
)
906 cpumask_t oldmask
= CPU_MASK_ALL
;
907 struct powernow_k8_data
*data
= powernow_data
[pol
->cpu
];
908 u32 checkfid
= data
->currfid
;
909 u32 checkvid
= data
->currvid
;
910 unsigned int newstate
;
914 /* only run on specific CPU from here on */
915 oldmask
= current
->cpus_allowed
;
916 set_cpus_allowed(current
, cpumask_of_cpu(pol
->cpu
));
918 if (smp_processor_id() != pol
->cpu
) {
919 printk(KERN_ERR PFX
"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
);
974 /* Driver entry point to verify the policy and range of frequencies */
975 static int powernowk8_verify(struct cpufreq_policy
*pol
)
977 struct powernow_k8_data
*data
= powernow_data
[pol
->cpu
];
979 return cpufreq_frequency_table_verify(pol
, data
->powernow_table
);
982 /* per CPU init entry point to the driver */
983 static int __init
powernowk8_cpu_init(struct cpufreq_policy
*pol
)
985 struct powernow_k8_data
*data
;
986 cpumask_t oldmask
= CPU_MASK_ALL
;
989 if (!cpu_online(pol
->cpu
))
992 if (!check_supported_cpu(pol
->cpu
))
995 data
= kzalloc(sizeof(struct powernow_k8_data
), GFP_KERNEL
);
997 printk(KERN_ERR PFX
"unable to alloc 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
));
1030 if (smp_processor_id() != pol
->cpu
) {
1031 printk(KERN_ERR PFX
"limiting to cpu %u failed\n", pol
->cpu
);
1035 if (pending_bit_stuck()) {
1036 printk(KERN_ERR PFX
"failing init, change pending bit set\n");
1040 if (query_current_values_with_pending_wait(data
))
1045 /* run on any CPU again */
1046 set_cpus_allowed(current
, oldmask
);
1048 pol
->governor
= CPUFREQ_DEFAULT_GOVERNOR
;
1049 pol
->cpus
= cpu_core_map
[pol
->cpu
];
1051 /* Take a crude guess here.
1052 * That guess was in microseconds, so multiply with 1000 */
1053 pol
->cpuinfo
.transition_latency
= (((data
->rvo
+ 8) * data
->vstable
* VST_UNITS_20US
)
1054 + (3 * (1 << data
->irt
) * 10)) * 1000;
1056 pol
->cur
= find_khz_freq_from_fid(data
->currfid
);
1057 dprintk("policy current frequency %d kHz\n", pol
->cur
);
1059 /* min/max the cpu is capable of */
1060 if (cpufreq_frequency_table_cpuinfo(pol
, data
->powernow_table
)) {
1061 printk(KERN_ERR PFX
"invalid powernow_table\n");
1062 powernow_k8_cpu_exit_acpi(data
);
1063 kfree(data
->powernow_table
);
1068 cpufreq_frequency_table_get_attr(data
->powernow_table
, pol
->cpu
);
1070 printk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1071 data
->currfid
, data
->currvid
);
1073 for_each_cpu_mask(i
, cpu_core_map
[pol
->cpu
]) {
1074 powernow_data
[i
] = data
;
1080 set_cpus_allowed(current
, oldmask
);
1081 powernow_k8_cpu_exit_acpi(data
);
1087 static int __devexit
powernowk8_cpu_exit (struct cpufreq_policy
*pol
)
1089 struct powernow_k8_data
*data
= powernow_data
[pol
->cpu
];
1094 powernow_k8_cpu_exit_acpi(data
);
1096 cpufreq_frequency_table_put_attr(pol
->cpu
);
1098 kfree(data
->powernow_table
);
1104 static unsigned int powernowk8_get (unsigned int cpu
)
1106 struct powernow_k8_data
*data
= powernow_data
[cpu
];
1107 cpumask_t oldmask
= current
->cpus_allowed
;
1108 unsigned int khz
= 0;
1110 set_cpus_allowed(current
, cpumask_of_cpu(cpu
));
1111 if (smp_processor_id() != cpu
) {
1112 printk(KERN_ERR PFX
"limiting to CPU %d failed in powernowk8_get\n", cpu
);
1113 set_cpus_allowed(current
, oldmask
);
1117 if (query_current_values_with_pending_wait(data
))
1120 khz
= find_khz_freq_from_fid(data
->currfid
);
1123 set_cpus_allowed(current
, oldmask
);
1127 static struct freq_attr
* powernow_k8_attr
[] = {
1128 &cpufreq_freq_attr_scaling_available_freqs
,
1132 static struct cpufreq_driver cpufreq_amd64_driver
= {
1133 .verify
= powernowk8_verify
,
1134 .target
= powernowk8_target
,
1135 .init
= powernowk8_cpu_init
,
1136 .exit
= __devexit_p(powernowk8_cpu_exit
),
1137 .get
= powernowk8_get
,
1138 .name
= "powernow-k8",
1139 .owner
= THIS_MODULE
,
1140 .attr
= powernow_k8_attr
,
1143 /* driver entry point for init */
1144 static int __init
powernowk8_init(void)
1146 unsigned int i
, supported_cpus
= 0;
1148 for (i
=0; i
<NR_CPUS
; i
++) {
1151 if (check_supported_cpu(i
))
1155 if (supported_cpus
== num_online_cpus()) {
1156 printk(KERN_INFO PFX
"Found %d AMD Athlon 64 / Opteron processors (" VERSION
")\n",
1158 return cpufreq_register_driver(&cpufreq_amd64_driver
);
1164 /* driver entry point for term */
1165 static void __exit
powernowk8_exit(void)
1169 cpufreq_unregister_driver(&cpufreq_amd64_driver
);
1172 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com>");
1173 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1174 MODULE_LICENSE("GPL");
1176 late_initcall(powernowk8_init
);
1177 module_exit(powernowk8_exit
);