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 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 VERSION "version 2.20.00"
49 #include "powernow-k8.h"
51 /* serialize freq changes */
52 static DEFINE_MUTEX(fidvid_mutex
);
54 static DEFINE_PER_CPU(struct powernow_k8_data
*, powernow_data
);
56 static int cpu_family
= CPU_OPTERON
;
59 DEFINE_PER_CPU(cpumask_t
, cpu_core_map
);
62 /* Return a frequency in MHz, given an input fid */
63 static u32
find_freq_from_fid(u32 fid
)
65 return 800 + (fid
* 100);
68 /* Return a frequency in KHz, given an input fid */
69 static u32
find_khz_freq_from_fid(u32 fid
)
71 return 1000 * find_freq_from_fid(fid
);
74 static u32
find_khz_freq_from_pstate(struct cpufreq_frequency_table
*data
, u32 pstate
)
76 return data
[pstate
].frequency
;
79 /* Return the vco fid for an input fid
81 * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
82 * only from corresponding high fids. This returns "high" fid corresponding to
85 static u32
convert_fid_to_vco_fid(u32 fid
)
87 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 if (cpu_family
== CPU_HW_PSTATE
)
104 rdmsr(MSR_FIDVID_STATUS
, lo
, hi
);
105 return lo
& MSR_S_LO_CHANGE_PENDING
? 1 : 0;
109 * Update the global current fid / vid values from the status msr.
110 * Returns 1 on error.
112 static int query_current_values_with_pending_wait(struct powernow_k8_data
*data
)
117 if (cpu_family
== CPU_HW_PSTATE
) {
118 rdmsr(MSR_PSTATE_STATUS
, lo
, hi
);
119 i
= lo
& HW_PSTATE_MASK
;
120 data
->currpstate
= i
;
125 dprintk("detected change pending stuck\n");
128 rdmsr(MSR_FIDVID_STATUS
, lo
, hi
);
129 } while (lo
& MSR_S_LO_CHANGE_PENDING
);
131 data
->currvid
= hi
& MSR_S_HI_CURRENT_VID
;
132 data
->currfid
= lo
& MSR_S_LO_CURRENT_FID
;
137 /* the isochronous relief time */
138 static void count_off_irt(struct powernow_k8_data
*data
)
140 udelay((1 << data
->irt
) * 10);
144 /* the voltage stabilization time */
145 static void count_off_vst(struct powernow_k8_data
*data
)
147 udelay(data
->vstable
* VST_UNITS_20US
);
151 /* need to init the control msr to a safe value (for each cpu) */
152 static void fidvid_msr_init(void)
157 rdmsr(MSR_FIDVID_STATUS
, lo
, hi
);
158 vid
= hi
& MSR_S_HI_CURRENT_VID
;
159 fid
= lo
& MSR_S_LO_CURRENT_FID
;
160 lo
= fid
| (vid
<< MSR_C_LO_VID_SHIFT
);
161 hi
= MSR_C_HI_STP_GNT_BENIGN
;
162 dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo
, hi
);
163 wrmsr(MSR_FIDVID_CTL
, lo
, hi
);
166 /* write the new fid value along with the other control fields to the msr */
167 static int write_new_fid(struct powernow_k8_data
*data
, u32 fid
)
170 u32 savevid
= data
->currvid
;
173 if ((fid
& INVALID_FID_MASK
) || (data
->currvid
& INVALID_VID_MASK
)) {
174 printk(KERN_ERR PFX
"internal error - overflow on fid write\n");
178 lo
= fid
| (data
->currvid
<< MSR_C_LO_VID_SHIFT
) | MSR_C_LO_INIT_FID_VID
;
180 dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
181 fid
, lo
, data
->plllock
* PLL_LOCK_CONVERSION
);
184 wrmsr(MSR_FIDVID_CTL
, lo
, data
->plllock
* PLL_LOCK_CONVERSION
);
186 printk(KERN_ERR PFX
"Hardware error - pending bit very stuck - no further pstate changes possible\n");
189 } while (query_current_values_with_pending_wait(data
));
193 if (savevid
!= data
->currvid
) {
194 printk(KERN_ERR PFX
"vid change on fid trans, old 0x%x, new 0x%x\n",
195 savevid
, data
->currvid
);
199 if (fid
!= data
->currfid
) {
200 printk(KERN_ERR PFX
"fid trans failed, fid 0x%x, curr 0x%x\n", fid
,
208 /* Write a new vid to the hardware */
209 static int write_new_vid(struct powernow_k8_data
*data
, u32 vid
)
212 u32 savefid
= data
->currfid
;
215 if ((data
->currfid
& INVALID_FID_MASK
) || (vid
& INVALID_VID_MASK
)) {
216 printk(KERN_ERR PFX
"internal error - overflow on vid write\n");
220 lo
= data
->currfid
| (vid
<< MSR_C_LO_VID_SHIFT
) | MSR_C_LO_INIT_FID_VID
;
222 dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
223 vid
, lo
, STOP_GRANT_5NS
);
226 wrmsr(MSR_FIDVID_CTL
, lo
, STOP_GRANT_5NS
);
228 printk(KERN_ERR PFX
"internal error - pending bit very stuck - no further pstate changes possible\n");
231 } while (query_current_values_with_pending_wait(data
));
233 if (savefid
!= data
->currfid
) {
234 printk(KERN_ERR PFX
"fid changed on vid trans, old 0x%x new 0x%x\n",
235 savefid
, data
->currfid
);
239 if (vid
!= data
->currvid
) {
240 printk(KERN_ERR PFX
"vid trans failed, vid 0x%x, curr 0x%x\n", vid
,
249 * Reduce the vid by the max of step or reqvid.
250 * Decreasing vid codes represent increasing voltages:
251 * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
253 static int decrease_vid_code_by_step(struct powernow_k8_data
*data
, u32 reqvid
, u32 step
)
255 if ((data
->currvid
- reqvid
) > step
)
256 reqvid
= data
->currvid
- step
;
258 if (write_new_vid(data
, reqvid
))
266 /* Change hardware pstate by single MSR write */
267 static int transition_pstate(struct powernow_k8_data
*data
, u32 pstate
)
269 wrmsr(MSR_PSTATE_CTRL
, pstate
, 0);
270 data
->currpstate
= pstate
;
274 /* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
275 static int transition_fid_vid(struct powernow_k8_data
*data
, u32 reqfid
, u32 reqvid
)
277 if (core_voltage_pre_transition(data
, reqvid
))
280 if (core_frequency_transition(data
, reqfid
))
283 if (core_voltage_post_transition(data
, reqvid
))
286 if (query_current_values_with_pending_wait(data
))
289 if ((reqfid
!= data
->currfid
) || (reqvid
!= data
->currvid
)) {
290 printk(KERN_ERR PFX
"failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
292 reqfid
, reqvid
, data
->currfid
, data
->currvid
);
296 dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
297 smp_processor_id(), data
->currfid
, data
->currvid
);
302 /* Phase 1 - core voltage transition ... setup voltage */
303 static int core_voltage_pre_transition(struct powernow_k8_data
*data
, u32 reqvid
)
305 u32 rvosteps
= data
->rvo
;
306 u32 savefid
= data
->currfid
;
309 dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
311 data
->currfid
, data
->currvid
, reqvid
, data
->rvo
);
313 rdmsr(MSR_FIDVID_STATUS
, lo
, maxvid
);
314 maxvid
= 0x1f & (maxvid
>> 16);
315 dprintk("ph1 maxvid=0x%x\n", maxvid
);
316 if (reqvid
< maxvid
) /* lower numbers are higher voltages */
319 while (data
->currvid
> reqvid
) {
320 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
321 data
->currvid
, reqvid
);
322 if (decrease_vid_code_by_step(data
, reqvid
, data
->vidmvs
))
326 while ((rvosteps
> 0) && ((data
->rvo
+ data
->currvid
) > reqvid
)) {
327 if (data
->currvid
== maxvid
) {
330 dprintk("ph1: changing vid for rvo, req 0x%x\n",
332 if (decrease_vid_code_by_step(data
, data
->currvid
- 1, 1))
338 if (query_current_values_with_pending_wait(data
))
341 if (savefid
!= data
->currfid
) {
342 printk(KERN_ERR PFX
"ph1 err, currfid changed 0x%x\n", data
->currfid
);
346 dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
347 data
->currfid
, data
->currvid
);
352 /* Phase 2 - core frequency transition */
353 static int core_frequency_transition(struct powernow_k8_data
*data
, u32 reqfid
)
355 u32 vcoreqfid
, vcocurrfid
, vcofiddiff
, fid_interval
, savevid
= data
->currvid
;
357 if ((reqfid
< HI_FID_TABLE_BOTTOM
) && (data
->currfid
< HI_FID_TABLE_BOTTOM
)) {
358 printk(KERN_ERR PFX
"ph2: illegal lo-lo transition 0x%x 0x%x\n",
359 reqfid
, data
->currfid
);
363 if (data
->currfid
== reqfid
) {
364 printk(KERN_ERR PFX
"ph2 null fid transition 0x%x\n", data
->currfid
);
368 dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
370 data
->currfid
, data
->currvid
, reqfid
);
372 vcoreqfid
= convert_fid_to_vco_fid(reqfid
);
373 vcocurrfid
= convert_fid_to_vco_fid(data
->currfid
);
374 vcofiddiff
= vcocurrfid
> vcoreqfid
? vcocurrfid
- vcoreqfid
375 : vcoreqfid
- vcocurrfid
;
377 while (vcofiddiff
> 2) {
378 (data
->currfid
& 1) ? (fid_interval
= 1) : (fid_interval
= 2);
380 if (reqfid
> data
->currfid
) {
381 if (data
->currfid
> LO_FID_TABLE_TOP
) {
382 if (write_new_fid(data
, data
->currfid
+ fid_interval
)) {
387 (data
, 2 + convert_fid_to_vco_fid(data
->currfid
))) {
392 if (write_new_fid(data
, data
->currfid
- fid_interval
))
396 vcocurrfid
= convert_fid_to_vco_fid(data
->currfid
);
397 vcofiddiff
= vcocurrfid
> vcoreqfid
? vcocurrfid
- vcoreqfid
398 : vcoreqfid
- vcocurrfid
;
401 if (write_new_fid(data
, reqfid
))
404 if (query_current_values_with_pending_wait(data
))
407 if (data
->currfid
!= reqfid
) {
409 "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
410 data
->currfid
, reqfid
);
414 if (savevid
!= data
->currvid
) {
415 printk(KERN_ERR PFX
"ph2: vid changed, save 0x%x, curr 0x%x\n",
416 savevid
, data
->currvid
);
420 dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
421 data
->currfid
, data
->currvid
);
426 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
427 static int core_voltage_post_transition(struct powernow_k8_data
*data
, u32 reqvid
)
429 u32 savefid
= data
->currfid
;
430 u32 savereqvid
= reqvid
;
432 dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
434 data
->currfid
, data
->currvid
);
436 if (reqvid
!= data
->currvid
) {
437 if (write_new_vid(data
, reqvid
))
440 if (savefid
!= data
->currfid
) {
442 "ph3: bad fid change, save 0x%x, curr 0x%x\n",
443 savefid
, data
->currfid
);
447 if (data
->currvid
!= reqvid
) {
449 "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
450 reqvid
, data
->currvid
);
455 if (query_current_values_with_pending_wait(data
))
458 if (savereqvid
!= data
->currvid
) {
459 dprintk("ph3 failed, currvid 0x%x\n", data
->currvid
);
463 if (savefid
!= data
->currfid
) {
464 dprintk("ph3 failed, currfid changed 0x%x\n",
469 dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
470 data
->currfid
, data
->currvid
);
475 static int check_supported_cpu(unsigned int cpu
)
478 u32 eax
, ebx
, ecx
, edx
;
481 oldmask
= current
->cpus_allowed
;
482 set_cpus_allowed_ptr(current
, &cpumask_of_cpu(cpu
));
484 if (smp_processor_id() != cpu
) {
485 printk(KERN_ERR PFX
"limiting to cpu %u failed\n", cpu
);
489 if (current_cpu_data
.x86_vendor
!= X86_VENDOR_AMD
)
492 eax
= cpuid_eax(CPUID_PROCESSOR_SIGNATURE
);
493 if (((eax
& CPUID_XFAM
) != CPUID_XFAM_K8
) &&
494 ((eax
& CPUID_XFAM
) < CPUID_XFAM_10H
))
497 if ((eax
& CPUID_XFAM
) == CPUID_XFAM_K8
) {
498 if (((eax
& CPUID_USE_XFAM_XMOD
) != CPUID_USE_XFAM_XMOD
) ||
499 ((eax
& CPUID_XMOD
) > CPUID_XMOD_REV_MASK
)) {
500 printk(KERN_INFO PFX
"Processor cpuid %x not supported\n", eax
);
504 eax
= cpuid_eax(CPUID_GET_MAX_CAPABILITIES
);
505 if (eax
< CPUID_FREQ_VOLT_CAPABILITIES
) {
507 "No frequency change capabilities detected\n");
511 cpuid(CPUID_FREQ_VOLT_CAPABILITIES
, &eax
, &ebx
, &ecx
, &edx
);
512 if ((edx
& P_STATE_TRANSITION_CAPABLE
) != P_STATE_TRANSITION_CAPABLE
) {
513 printk(KERN_INFO PFX
"Power state transitions not supported\n");
516 } else { /* must be a HW Pstate capable processor */
517 cpuid(CPUID_FREQ_VOLT_CAPABILITIES
, &eax
, &ebx
, &ecx
, &edx
);
518 if ((edx
& USE_HW_PSTATE
) == USE_HW_PSTATE
)
519 cpu_family
= CPU_HW_PSTATE
;
527 set_cpus_allowed_ptr(current
, &oldmask
);
531 static int check_pst_table(struct powernow_k8_data
*data
, struct pst_s
*pst
, u8 maxvid
)
536 for (j
= 0; j
< data
->numps
; j
++) {
537 if (pst
[j
].vid
> LEAST_VID
) {
538 printk(KERN_ERR FW_BUG PFX
"vid %d invalid : 0x%x\n",
542 if (pst
[j
].vid
< data
->rvo
) { /* vid + rvo >= 0 */
543 printk(KERN_ERR FW_BUG PFX
"0 vid exceeded with pstate"
547 if (pst
[j
].vid
< maxvid
+ data
->rvo
) { /* vid + rvo >= maxvid */
548 printk(KERN_ERR FW_BUG PFX
"maxvid exceeded with pstate"
552 if (pst
[j
].fid
> MAX_FID
) {
553 printk(KERN_ERR FW_BUG PFX
"maxfid exceeded with pstate"
557 if (j
&& (pst
[j
].fid
< HI_FID_TABLE_BOTTOM
)) {
558 /* Only first fid is allowed to be in "low" range */
559 printk(KERN_ERR FW_BUG PFX
"two low fids - %d : "
560 "0x%x\n", j
, pst
[j
].fid
);
563 if (pst
[j
].fid
< lastfid
)
564 lastfid
= pst
[j
].fid
;
567 printk(KERN_ERR FW_BUG PFX
"lastfid invalid\n");
570 if (lastfid
> LO_FID_TABLE_TOP
)
571 printk(KERN_INFO FW_BUG PFX
"first fid not from lo freq table\n");
576 static void print_basics(struct powernow_k8_data
*data
)
579 for (j
= 0; j
< data
->numps
; j
++) {
580 if (data
->powernow_table
[j
].frequency
!= CPUFREQ_ENTRY_INVALID
) {
581 if (cpu_family
== CPU_HW_PSTATE
) {
582 printk(KERN_INFO PFX
" %d : pstate %d (%d MHz)\n",
584 data
->powernow_table
[j
].index
,
585 data
->powernow_table
[j
].frequency
/1000);
587 printk(KERN_INFO PFX
" %d : fid 0x%x (%d MHz), vid 0x%x\n",
589 data
->powernow_table
[j
].index
& 0xff,
590 data
->powernow_table
[j
].frequency
/1000,
591 data
->powernow_table
[j
].index
>> 8);
596 printk(KERN_INFO PFX
"Only %d pstates on battery\n", data
->batps
);
599 static int fill_powernow_table(struct powernow_k8_data
*data
, struct pst_s
*pst
, u8 maxvid
)
601 struct cpufreq_frequency_table
*powernow_table
;
604 if (data
->batps
) { /* use ACPI support to get full speed on mains power */
605 printk(KERN_WARNING PFX
"Only %d pstates usable (use ACPI driver for full range\n", data
->batps
);
606 data
->numps
= data
->batps
;
609 for ( j
=1; j
<data
->numps
; j
++ ) {
610 if (pst
[j
-1].fid
>= pst
[j
].fid
) {
611 printk(KERN_ERR PFX
"PST out of sequence\n");
616 if (data
->numps
< 2) {
617 printk(KERN_ERR PFX
"no p states to transition\n");
621 if (check_pst_table(data
, pst
, maxvid
))
624 powernow_table
= kmalloc((sizeof(struct cpufreq_frequency_table
)
625 * (data
->numps
+ 1)), GFP_KERNEL
);
626 if (!powernow_table
) {
627 printk(KERN_ERR PFX
"powernow_table memory alloc failure\n");
631 for (j
= 0; j
< data
->numps
; j
++) {
632 powernow_table
[j
].index
= pst
[j
].fid
; /* lower 8 bits */
633 powernow_table
[j
].index
|= (pst
[j
].vid
<< 8); /* upper 8 bits */
634 powernow_table
[j
].frequency
= find_khz_freq_from_fid(pst
[j
].fid
);
636 powernow_table
[data
->numps
].frequency
= CPUFREQ_TABLE_END
;
637 powernow_table
[data
->numps
].index
= 0;
639 if (query_current_values_with_pending_wait(data
)) {
640 kfree(powernow_table
);
644 dprintk("cfid 0x%x, cvid 0x%x\n", data
->currfid
, data
->currvid
);
645 data
->powernow_table
= powernow_table
;
646 if (first_cpu(per_cpu(cpu_core_map
, data
->cpu
)) == data
->cpu
)
649 for (j
= 0; j
< data
->numps
; j
++)
650 if ((pst
[j
].fid
==data
->currfid
) && (pst
[j
].vid
==data
->currvid
))
653 dprintk("currfid/vid do not match PST, ignoring\n");
657 /* Find and validate the PSB/PST table in BIOS. */
658 static int find_psb_table(struct powernow_k8_data
*data
)
667 for (i
= 0xc0000; i
< 0xffff0; i
+= 0x10) {
668 /* Scan BIOS looking for the signature. */
669 /* It can not be at ffff0 - it is too big. */
671 psb
= phys_to_virt(i
);
672 if (memcmp(psb
, PSB_ID_STRING
, PSB_ID_STRING_LEN
) != 0)
675 dprintk("found PSB header at 0x%p\n", psb
);
677 dprintk("table vers: 0x%x\n", psb
->tableversion
);
678 if (psb
->tableversion
!= PSB_VERSION_1_4
) {
679 printk(KERN_ERR FW_BUG PFX
"PSB table is not v1.4\n");
683 dprintk("flags: 0x%x\n", psb
->flags1
);
685 printk(KERN_ERR FW_BUG PFX
"unknown flags\n");
689 data
->vstable
= psb
->vstable
;
690 dprintk("voltage stabilization time: %d(*20us)\n", data
->vstable
);
692 dprintk("flags2: 0x%x\n", psb
->flags2
);
693 data
->rvo
= psb
->flags2
& 3;
694 data
->irt
= ((psb
->flags2
) >> 2) & 3;
695 mvs
= ((psb
->flags2
) >> 4) & 3;
696 data
->vidmvs
= 1 << mvs
;
697 data
->batps
= ((psb
->flags2
) >> 6) & 3;
699 dprintk("ramp voltage offset: %d\n", data
->rvo
);
700 dprintk("isochronous relief time: %d\n", data
->irt
);
701 dprintk("maximum voltage step: %d - 0x%x\n", mvs
, data
->vidmvs
);
703 dprintk("numpst: 0x%x\n", psb
->num_tables
);
704 cpst
= psb
->num_tables
;
705 if ((psb
->cpuid
== 0x00000fc0) || (psb
->cpuid
== 0x00000fe0) ){
706 thiscpuid
= cpuid_eax(CPUID_PROCESSOR_SIGNATURE
);
707 if ((thiscpuid
== 0x00000fc0) || (thiscpuid
== 0x00000fe0) ) {
712 printk(KERN_ERR FW_BUG PFX
"numpst must be 1\n");
716 data
->plllock
= psb
->plllocktime
;
717 dprintk("plllocktime: 0x%x (units 1us)\n", psb
->plllocktime
);
718 dprintk("maxfid: 0x%x\n", psb
->maxfid
);
719 dprintk("maxvid: 0x%x\n", psb
->maxvid
);
720 maxvid
= psb
->maxvid
;
722 data
->numps
= psb
->numps
;
723 dprintk("numpstates: 0x%x\n", data
->numps
);
724 return fill_powernow_table(data
, (struct pst_s
*)(psb
+1), maxvid
);
727 * If you see this message, complain to BIOS manufacturer. If
728 * he tells you "we do not support Linux" or some similar
729 * nonsense, remember that Windows 2000 uses the same legacy
730 * mechanism that the old Linux PSB driver uses. Tell them it
731 * is broken with Windows 2000.
733 * The reference to the AMD documentation is chapter 9 in the
734 * BIOS and Kernel Developer's Guide, which is available on
737 printk(KERN_ERR PFX
"BIOS error - no PSB or ACPI _PSS objects\n");
741 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
742 static void powernow_k8_acpi_pst_values(struct powernow_k8_data
*data
, unsigned int index
)
744 if (!data
->acpi_data
.state_count
|| (cpu_family
== CPU_HW_PSTATE
))
747 data
->irt
= (data
->acpi_data
.states
[index
].control
>> IRT_SHIFT
) & IRT_MASK
;
748 data
->rvo
= (data
->acpi_data
.states
[index
].control
>> RVO_SHIFT
) & RVO_MASK
;
749 data
->exttype
= (data
->acpi_data
.states
[index
].control
>> EXT_TYPE_SHIFT
) & EXT_TYPE_MASK
;
750 data
->plllock
= (data
->acpi_data
.states
[index
].control
>> PLL_L_SHIFT
) & PLL_L_MASK
;
751 data
->vidmvs
= 1 << ((data
->acpi_data
.states
[index
].control
>> MVS_SHIFT
) & MVS_MASK
);
752 data
->vstable
= (data
->acpi_data
.states
[index
].control
>> VST_SHIFT
) & VST_MASK
;
755 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data
*data
)
757 struct cpufreq_frequency_table
*powernow_table
;
760 if (acpi_processor_register_performance(&data
->acpi_data
, data
->cpu
)) {
761 dprintk("register performance failed: bad ACPI data\n");
765 /* verify the data contained in the ACPI structures */
766 if (data
->acpi_data
.state_count
<= 1) {
767 dprintk("No ACPI P-States\n");
771 if ((data
->acpi_data
.control_register
.space_id
!= ACPI_ADR_SPACE_FIXED_HARDWARE
) ||
772 (data
->acpi_data
.status_register
.space_id
!= ACPI_ADR_SPACE_FIXED_HARDWARE
)) {
773 dprintk("Invalid control/status registers (%x - %x)\n",
774 data
->acpi_data
.control_register
.space_id
,
775 data
->acpi_data
.status_register
.space_id
);
779 /* fill in data->powernow_table */
780 powernow_table
= kmalloc((sizeof(struct cpufreq_frequency_table
)
781 * (data
->acpi_data
.state_count
+ 1)), GFP_KERNEL
);
782 if (!powernow_table
) {
783 dprintk("powernow_table memory alloc failure\n");
787 if (cpu_family
== CPU_HW_PSTATE
)
788 ret_val
= fill_powernow_table_pstate(data
, powernow_table
);
790 ret_val
= fill_powernow_table_fidvid(data
, powernow_table
);
794 powernow_table
[data
->acpi_data
.state_count
].frequency
= CPUFREQ_TABLE_END
;
795 powernow_table
[data
->acpi_data
.state_count
].index
= 0;
796 data
->powernow_table
= powernow_table
;
799 data
->numps
= data
->acpi_data
.state_count
;
800 if (first_cpu(per_cpu(cpu_core_map
, data
->cpu
)) == data
->cpu
)
802 powernow_k8_acpi_pst_values(data
, 0);
804 /* notify BIOS that we exist */
805 acpi_processor_notify_smm(THIS_MODULE
);
810 kfree(powernow_table
);
813 acpi_processor_unregister_performance(&data
->acpi_data
, data
->cpu
);
815 /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
816 data
->acpi_data
.state_count
= 0;
821 static int fill_powernow_table_pstate(struct powernow_k8_data
*data
, struct cpufreq_frequency_table
*powernow_table
)
825 rdmsr(MSR_PSTATE_CUR_LIMIT
, hi
, lo
);
826 data
->max_hw_pstate
= (hi
& HW_PSTATE_MAX_MASK
) >> HW_PSTATE_MAX_SHIFT
;
828 for (i
= 0; i
< data
->acpi_data
.state_count
; i
++) {
831 index
= data
->acpi_data
.states
[i
].control
& HW_PSTATE_MASK
;
832 if (index
> data
->max_hw_pstate
) {
833 printk(KERN_ERR PFX
"invalid pstate %d - bad value %d.\n", i
, index
);
834 printk(KERN_ERR PFX
"Please report to BIOS manufacturer\n");
835 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
838 rdmsr(MSR_PSTATE_DEF_BASE
+ index
, lo
, hi
);
839 if (!(hi
& HW_PSTATE_VALID_MASK
)) {
840 dprintk("invalid pstate %d, ignoring\n", index
);
841 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
845 powernow_table
[i
].index
= index
;
847 powernow_table
[i
].frequency
= data
->acpi_data
.states
[i
].core_frequency
* 1000;
852 static int fill_powernow_table_fidvid(struct powernow_k8_data
*data
, struct cpufreq_frequency_table
*powernow_table
)
856 for (i
= 0; i
< data
->acpi_data
.state_count
; i
++) {
861 fid
= data
->acpi_data
.states
[i
].status
& EXT_FID_MASK
;
862 vid
= (data
->acpi_data
.states
[i
].status
>> VID_SHIFT
) & EXT_VID_MASK
;
864 fid
= data
->acpi_data
.states
[i
].control
& FID_MASK
;
865 vid
= (data
->acpi_data
.states
[i
].control
>> VID_SHIFT
) & VID_MASK
;
868 dprintk(" %d : fid 0x%x, vid 0x%x\n", i
, fid
, vid
);
870 powernow_table
[i
].index
= fid
; /* lower 8 bits */
871 powernow_table
[i
].index
|= (vid
<< 8); /* upper 8 bits */
872 powernow_table
[i
].frequency
= find_khz_freq_from_fid(fid
);
874 /* verify frequency is OK */
875 if ((powernow_table
[i
].frequency
> (MAX_FREQ
* 1000)) ||
876 (powernow_table
[i
].frequency
< (MIN_FREQ
* 1000))) {
877 dprintk("invalid freq %u kHz, ignoring\n", powernow_table
[i
].frequency
);
878 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
882 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
883 if (vid
== VID_OFF
) {
884 dprintk("invalid vid %u, ignoring\n", vid
);
885 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
889 /* verify only 1 entry from the lo frequency table */
890 if (fid
< HI_FID_TABLE_BOTTOM
) {
892 /* if both entries are the same, ignore this one ... */
893 if ((powernow_table
[i
].frequency
!= powernow_table
[cntlofreq
].frequency
) ||
894 (powernow_table
[i
].index
!= powernow_table
[cntlofreq
].index
)) {
895 printk(KERN_ERR PFX
"Too many lo freq table entries\n");
899 dprintk("double low frequency table entry, ignoring it.\n");
900 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
906 if (powernow_table
[i
].frequency
!= (data
->acpi_data
.states
[i
].core_frequency
* 1000)) {
907 printk(KERN_INFO PFX
"invalid freq entries %u kHz vs. %u kHz\n",
908 powernow_table
[i
].frequency
,
909 (unsigned int) (data
->acpi_data
.states
[i
].core_frequency
* 1000));
910 powernow_table
[i
].frequency
= CPUFREQ_ENTRY_INVALID
;
917 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data
*data
)
919 if (data
->acpi_data
.state_count
)
920 acpi_processor_unregister_performance(&data
->acpi_data
, data
->cpu
);
924 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data
*data
) { return -ENODEV
; }
925 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data
*data
) { return; }
926 static void powernow_k8_acpi_pst_values(struct powernow_k8_data
*data
, unsigned int index
) { return; }
927 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
929 /* Take a frequency, and issue the fid/vid transition command */
930 static int transition_frequency_fidvid(struct powernow_k8_data
*data
, unsigned int index
)
935 struct cpufreq_freqs freqs
;
937 dprintk("cpu %d transition to index %u\n", smp_processor_id(), index
);
939 /* fid/vid correctness check for k8 */
940 /* fid are the lower 8 bits of the index we stored into
941 * the cpufreq frequency table in find_psb_table, vid
942 * are the upper 8 bits.
944 fid
= data
->powernow_table
[index
].index
& 0xFF;
945 vid
= (data
->powernow_table
[index
].index
& 0xFF00) >> 8;
947 dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid
, vid
);
949 if (query_current_values_with_pending_wait(data
))
952 if ((data
->currvid
== vid
) && (data
->currfid
== fid
)) {
953 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
958 if ((fid
< HI_FID_TABLE_BOTTOM
) && (data
->currfid
< HI_FID_TABLE_BOTTOM
)) {
960 "ignoring illegal change in lo freq table-%x to 0x%x\n",
965 dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
966 smp_processor_id(), fid
, vid
);
967 freqs
.old
= find_khz_freq_from_fid(data
->currfid
);
968 freqs
.new = find_khz_freq_from_fid(fid
);
970 for_each_cpu_mask_nr(i
, *(data
->available_cores
)) {
972 cpufreq_notify_transition(&freqs
, CPUFREQ_PRECHANGE
);
975 res
= transition_fid_vid(data
, fid
, vid
);
976 freqs
.new = find_khz_freq_from_fid(data
->currfid
);
978 for_each_cpu_mask_nr(i
, *(data
->available_cores
)) {
980 cpufreq_notify_transition(&freqs
, CPUFREQ_POSTCHANGE
);
985 /* Take a frequency, and issue the hardware pstate transition command */
986 static int transition_frequency_pstate(struct powernow_k8_data
*data
, unsigned int index
)
990 struct cpufreq_freqs freqs
;
992 dprintk("cpu %d transition to index %u\n", smp_processor_id(), index
);
994 /* get MSR index for hardware pstate transition */
995 pstate
= index
& HW_PSTATE_MASK
;
996 if (pstate
> data
->max_hw_pstate
)
998 freqs
.old
= find_khz_freq_from_pstate(data
->powernow_table
, data
->currpstate
);
999 freqs
.new = find_khz_freq_from_pstate(data
->powernow_table
, pstate
);
1001 for_each_cpu_mask_nr(i
, *(data
->available_cores
)) {
1003 cpufreq_notify_transition(&freqs
, CPUFREQ_PRECHANGE
);
1006 res
= transition_pstate(data
, pstate
);
1007 freqs
.new = find_khz_freq_from_pstate(data
->powernow_table
, pstate
);
1009 for_each_cpu_mask_nr(i
, *(data
->available_cores
)) {
1011 cpufreq_notify_transition(&freqs
, CPUFREQ_POSTCHANGE
);
1016 /* Driver entry point to switch to the target frequency */
1017 static int powernowk8_target(struct cpufreq_policy
*pol
, unsigned targfreq
, unsigned relation
)
1020 struct powernow_k8_data
*data
= per_cpu(powernow_data
, pol
->cpu
);
1023 unsigned int newstate
;
1029 checkfid
= data
->currfid
;
1030 checkvid
= data
->currvid
;
1032 /* only run on specific CPU from here on */
1033 oldmask
= current
->cpus_allowed
;
1034 set_cpus_allowed_ptr(current
, &cpumask_of_cpu(pol
->cpu
));
1036 if (smp_processor_id() != pol
->cpu
) {
1037 printk(KERN_ERR PFX
"limiting to cpu %u failed\n", pol
->cpu
);
1041 if (pending_bit_stuck()) {
1042 printk(KERN_ERR PFX
"failing targ, change pending bit set\n");
1046 dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
1047 pol
->cpu
, targfreq
, pol
->min
, pol
->max
, relation
);
1049 if (query_current_values_with_pending_wait(data
))
1052 if (cpu_family
!= CPU_HW_PSTATE
) {
1053 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
1054 data
->currfid
, data
->currvid
);
1056 if ((checkvid
!= data
->currvid
) || (checkfid
!= data
->currfid
)) {
1057 printk(KERN_INFO PFX
1058 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
1059 checkfid
, data
->currfid
, checkvid
, data
->currvid
);
1063 if (cpufreq_frequency_table_target(pol
, data
->powernow_table
, targfreq
, relation
, &newstate
))
1066 mutex_lock(&fidvid_mutex
);
1068 powernow_k8_acpi_pst_values(data
, newstate
);
1070 if (cpu_family
== CPU_HW_PSTATE
)
1071 ret
= transition_frequency_pstate(data
, newstate
);
1073 ret
= transition_frequency_fidvid(data
, newstate
);
1075 printk(KERN_ERR PFX
"transition frequency failed\n");
1077 mutex_unlock(&fidvid_mutex
);
1080 mutex_unlock(&fidvid_mutex
);
1082 if (cpu_family
== CPU_HW_PSTATE
)
1083 pol
->cur
= find_khz_freq_from_pstate(data
->powernow_table
, newstate
);
1085 pol
->cur
= find_khz_freq_from_fid(data
->currfid
);
1089 set_cpus_allowed_ptr(current
, &oldmask
);
1093 /* Driver entry point to verify the policy and range of frequencies */
1094 static int powernowk8_verify(struct cpufreq_policy
*pol
)
1096 struct powernow_k8_data
*data
= per_cpu(powernow_data
, pol
->cpu
);
1101 return cpufreq_frequency_table_verify(pol
, data
->powernow_table
);
1104 /* per CPU init entry point to the driver */
1105 static int __cpuinit
powernowk8_cpu_init(struct cpufreq_policy
*pol
)
1107 struct powernow_k8_data
*data
;
1111 if (!cpu_online(pol
->cpu
))
1114 if (!check_supported_cpu(pol
->cpu
))
1117 data
= kzalloc(sizeof(struct powernow_k8_data
), GFP_KERNEL
);
1119 printk(KERN_ERR PFX
"unable to alloc powernow_k8_data");
1123 data
->cpu
= pol
->cpu
;
1125 if (powernow_k8_cpu_init_acpi(data
)) {
1127 * Use the PSB BIOS structure. This is only availabe on
1128 * an UP version, and is deprecated by AMD.
1130 if (num_online_cpus() != 1) {
1131 #ifndef CONFIG_ACPI_PROCESSOR
1132 printk(KERN_ERR PFX
"ACPI Processor support is required "
1133 "for SMP systems but is absent. Please load the "
1134 "ACPI Processor module before starting this "
1137 printk(KERN_ERR FW_BUG PFX
"Your BIOS does not provide"
1138 " ACPI _PSS objects in a way that Linux "
1139 "understands. Please report this to the Linux "
1140 "ACPI maintainers and complain to your BIOS "
1146 if (pol
->cpu
!= 0) {
1147 printk(KERN_ERR FW_BUG PFX
"No ACPI _PSS objects for "
1148 "CPU other than CPU0. Complain to your BIOS "
1153 rc
= find_psb_table(data
);
1160 /* only run on specific CPU from here on */
1161 oldmask
= current
->cpus_allowed
;
1162 set_cpus_allowed_ptr(current
, &cpumask_of_cpu(pol
->cpu
));
1164 if (smp_processor_id() != pol
->cpu
) {
1165 printk(KERN_ERR PFX
"limiting to cpu %u failed\n", pol
->cpu
);
1169 if (pending_bit_stuck()) {
1170 printk(KERN_ERR PFX
"failing init, change pending bit set\n");
1174 if (query_current_values_with_pending_wait(data
))
1177 if (cpu_family
== CPU_OPTERON
)
1180 /* run on any CPU again */
1181 set_cpus_allowed_ptr(current
, &oldmask
);
1183 if (cpu_family
== CPU_HW_PSTATE
)
1184 pol
->cpus
= cpumask_of_cpu(pol
->cpu
);
1186 pol
->cpus
= per_cpu(cpu_core_map
, pol
->cpu
);
1187 data
->available_cores
= &(pol
->cpus
);
1189 /* Take a crude guess here.
1190 * That guess was in microseconds, so multiply with 1000 */
1191 pol
->cpuinfo
.transition_latency
= (((data
->rvo
+ 8) * data
->vstable
* VST_UNITS_20US
)
1192 + (3 * (1 << data
->irt
) * 10)) * 1000;
1194 if (cpu_family
== CPU_HW_PSTATE
)
1195 pol
->cur
= find_khz_freq_from_pstate(data
->powernow_table
, data
->currpstate
);
1197 pol
->cur
= find_khz_freq_from_fid(data
->currfid
);
1198 dprintk("policy current frequency %d kHz\n", pol
->cur
);
1200 /* min/max the cpu is capable of */
1201 if (cpufreq_frequency_table_cpuinfo(pol
, data
->powernow_table
)) {
1202 printk(KERN_ERR FW_BUG PFX
"invalid powernow_table\n");
1203 powernow_k8_cpu_exit_acpi(data
);
1204 kfree(data
->powernow_table
);
1209 cpufreq_frequency_table_get_attr(data
->powernow_table
, pol
->cpu
);
1211 if (cpu_family
== CPU_HW_PSTATE
)
1212 dprintk("cpu_init done, current pstate 0x%x\n", data
->currpstate
);
1214 dprintk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1215 data
->currfid
, data
->currvid
);
1217 per_cpu(powernow_data
, pol
->cpu
) = data
;
1222 set_cpus_allowed_ptr(current
, &oldmask
);
1223 powernow_k8_cpu_exit_acpi(data
);
1229 static int __devexit
powernowk8_cpu_exit (struct cpufreq_policy
*pol
)
1231 struct powernow_k8_data
*data
= per_cpu(powernow_data
, pol
->cpu
);
1236 powernow_k8_cpu_exit_acpi(data
);
1238 cpufreq_frequency_table_put_attr(pol
->cpu
);
1240 kfree(data
->powernow_table
);
1246 static unsigned int powernowk8_get (unsigned int cpu
)
1248 struct powernow_k8_data
*data
;
1249 cpumask_t oldmask
= current
->cpus_allowed
;
1250 unsigned int khz
= 0;
1253 first
= first_cpu(per_cpu(cpu_core_map
, cpu
));
1254 data
= per_cpu(powernow_data
, first
);
1259 set_cpus_allowed_ptr(current
, &cpumask_of_cpu(cpu
));
1260 if (smp_processor_id() != cpu
) {
1262 "limiting to CPU %d failed in powernowk8_get\n", cpu
);
1263 set_cpus_allowed_ptr(current
, &oldmask
);
1267 if (query_current_values_with_pending_wait(data
))
1270 if (cpu_family
== CPU_HW_PSTATE
)
1271 khz
= find_khz_freq_from_pstate(data
->powernow_table
,
1274 khz
= find_khz_freq_from_fid(data
->currfid
);
1278 set_cpus_allowed_ptr(current
, &oldmask
);
1282 static struct freq_attr
* powernow_k8_attr
[] = {
1283 &cpufreq_freq_attr_scaling_available_freqs
,
1287 static struct cpufreq_driver cpufreq_amd64_driver
= {
1288 .verify
= powernowk8_verify
,
1289 .target
= powernowk8_target
,
1290 .init
= powernowk8_cpu_init
,
1291 .exit
= __devexit_p(powernowk8_cpu_exit
),
1292 .get
= powernowk8_get
,
1293 .name
= "powernow-k8",
1294 .owner
= THIS_MODULE
,
1295 .attr
= powernow_k8_attr
,
1298 /* driver entry point for init */
1299 static int __cpuinit
powernowk8_init(void)
1301 unsigned int i
, supported_cpus
= 0;
1303 for_each_online_cpu(i
) {
1304 if (check_supported_cpu(i
))
1308 if (supported_cpus
== num_online_cpus()) {
1309 printk(KERN_INFO PFX
"Found %d %s "
1310 "processors (%d cpu cores) (" VERSION
")\n",
1312 boot_cpu_data
.x86_model_id
, supported_cpus
);
1313 return cpufreq_register_driver(&cpufreq_amd64_driver
);
1319 /* driver entry point for term */
1320 static void __exit
powernowk8_exit(void)
1324 cpufreq_unregister_driver(&cpufreq_amd64_driver
);
1327 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com>");
1328 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1329 MODULE_LICENSE("GPL");
1331 late_initcall(powernowk8_init
);
1332 module_exit(powernowk8_exit
);