2 * (c) 2003-2006 Advanced Micro Devices, Inc.
3 * Your use of this code is subject to the terms and conditions of the
4 * GNU general public license version 2. See "COPYING" or
5 * http://www.gnu.org/licenses/gpl.html
7 * Support : mark.langsdorf@amd.com
9 * Based on the powernow-k7.c module written by Dave Jones.
10 * (C) 2003 Dave Jones <davej@codemonkey.org.uk> on behalf of SuSE Labs
11 * (C) 2004 Dominik Brodowski <linux@brodo.de>
12 * (C) 2004 Pavel Machek <pavel@suse.cz>
13 * Licensed under the terms of the GNU GPL License version 2.
14 * Based upon datasheets & sample CPUs kindly provided by AMD.
16 * Valuable input gratefully received from Dave Jones, Pavel Machek,
17 * Dominik Brodowski, Jacob Shin, and others.
18 * Originally developed by Paul Devriendt.
19 * Processor information obtained from Chapter 9 (Power and Thermal Management)
20 * of the "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
21 * Opteron Processors" available for download from www.amd.com
23 * Tables for specific CPUs can be inferred from
24 * http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/30430.pdf
27 #include <linux/kernel.h>
28 #include <linux/smp.h>
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/cpufreq.h>
32 #include <linux/slab.h>
33 #include <linux/string.h>
34 #include <linux/cpumask.h>
35 #include <linux/sched.h> /* for current / set_cpus_allowed() */
39 #include <asm/delay.h>
41 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
42 #include <linux/acpi.h>
43 #include <linux/mutex.h>
44 #include <acpi/processor.h>
47 #define PFX "powernow-k8: "
48 #define BFX PFX "BIOS error: "
49 #define VERSION "version 2.20.00"
50 #include "powernow-k8.h"
52 /* serialize freq changes */
53 static DEFINE_MUTEX(fidvid_mutex);
55 static DEFINE_PER_CPU(struct powernow_k8_data *, powernow_data);
57 static int cpu_family = CPU_OPTERON;
60 DEFINE_PER_CPU(cpumask_t, cpu_core_map);
63 /* Return a frequency in MHz, given an input fid */
64 static u32 find_freq_from_fid(u32 fid)
66 return 800 + (fid * 100);
70 /* Return a frequency in KHz, given an input fid */
71 static u32 find_khz_freq_from_fid(u32 fid)
73 return 1000 * find_freq_from_fid(fid);
76 static u32 find_khz_freq_from_pstate(struct cpufreq_frequency_table *data, u32 pstate)
78 return data[pstate].frequency;
82 /* Return the vco fid for an input fid
84 * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
85 * only from corresponding high fids. This returns "high" fid corresponding to
88 static u32 convert_fid_to_vco_fid(u32 fid)
90 if (fid < HI_FID_TABLE_BOTTOM)
97 * Return 1 if the pending bit is set. Unless we just instructed the processor
98 * to transition to a new state, seeing this bit set is really bad news.
100 static int pending_bit_stuck(void)
104 if (cpu_family == CPU_HW_PSTATE)
107 rdmsr(MSR_FIDVID_STATUS, lo, hi);
108 return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
112 * Update the global current fid / vid values from the status msr.
113 * Returns 1 on error.
115 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
120 if (cpu_family == CPU_HW_PSTATE) {
121 rdmsr(MSR_PSTATE_STATUS, lo, hi);
122 i = lo & HW_PSTATE_MASK;
123 data->currpstate = i;
128 dprintk("detected change pending stuck\n");
131 rdmsr(MSR_FIDVID_STATUS, lo, hi);
132 } while (lo & MSR_S_LO_CHANGE_PENDING);
134 data->currvid = hi & MSR_S_HI_CURRENT_VID;
135 data->currfid = lo & MSR_S_LO_CURRENT_FID;
140 /* the isochronous relief time */
141 static void count_off_irt(struct powernow_k8_data *data)
143 udelay((1 << data->irt) * 10);
147 /* the voltage stabilization time */
148 static void count_off_vst(struct powernow_k8_data *data)
150 udelay(data->vstable * VST_UNITS_20US);
154 /* need to init the control msr to a safe value (for each cpu) */
155 static void fidvid_msr_init(void)
160 rdmsr(MSR_FIDVID_STATUS, lo, hi);
161 vid = hi & MSR_S_HI_CURRENT_VID;
162 fid = lo & MSR_S_LO_CURRENT_FID;
163 lo = fid | (vid << MSR_C_LO_VID_SHIFT);
164 hi = MSR_C_HI_STP_GNT_BENIGN;
165 dprintk("cpu%d, init lo 0x%x, hi 0x%x\n", smp_processor_id(), lo, hi);
166 wrmsr(MSR_FIDVID_CTL, lo, hi);
170 /* write the new fid value along with the other control fields to the msr */
171 static int write_new_fid(struct powernow_k8_data *data, u32 fid)
174 u32 savevid = data->currvid;
177 if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
178 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
182 lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
184 dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
185 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
188 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
190 printk(KERN_ERR PFX "Hardware error - pending bit very stuck - no further pstate changes possible\n");
193 } while (query_current_values_with_pending_wait(data));
197 if (savevid != data->currvid) {
198 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
199 savevid, data->currvid);
203 if (fid != data->currfid) {
204 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
212 /* Write a new vid to the hardware */
213 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
216 u32 savefid = data->currfid;
219 if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
220 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
224 lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
226 dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
227 vid, lo, STOP_GRANT_5NS);
230 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
232 printk(KERN_ERR PFX "internal error - pending bit very stuck - no further pstate changes possible\n");
235 } while (query_current_values_with_pending_wait(data));
237 if (savefid != data->currfid) {
238 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
239 savefid, data->currfid);
243 if (vid != data->currvid) {
244 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
253 * Reduce the vid by the max of step or reqvid.
254 * Decreasing vid codes represent increasing voltages:
255 * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
257 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
259 if ((data->currvid - reqvid) > step)
260 reqvid = data->currvid - step;
262 if (write_new_vid(data, reqvid))
270 /* Change hardware pstate by single MSR write */
271 static int transition_pstate(struct powernow_k8_data *data, u32 pstate)
273 wrmsr(MSR_PSTATE_CTRL, pstate, 0);
274 data->currpstate = pstate;
278 /* Change Opteron/Athlon64 fid and vid, by the 3 phases. */
279 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
281 if (core_voltage_pre_transition(data, reqvid))
284 if (core_frequency_transition(data, reqfid))
287 if (core_voltage_post_transition(data, reqvid))
290 if (query_current_values_with_pending_wait(data))
293 if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
294 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
296 reqfid, reqvid, data->currfid, data->currvid);
300 dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
301 smp_processor_id(), data->currfid, data->currvid);
306 /* Phase 1 - core voltage transition ... setup voltage */
307 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
309 u32 rvosteps = data->rvo;
310 u32 savefid = data->currfid;
313 dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
315 data->currfid, data->currvid, reqvid, data->rvo);
317 rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
318 maxvid = 0x1f & (maxvid >> 16);
319 dprintk("ph1 maxvid=0x%x\n", maxvid);
320 if (reqvid < maxvid) /* lower numbers are higher voltages */
323 while (data->currvid > reqvid) {
324 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
325 data->currvid, reqvid);
326 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
330 while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
331 if (data->currvid == maxvid) {
334 dprintk("ph1: changing vid for rvo, req 0x%x\n",
336 if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
342 if (query_current_values_with_pending_wait(data))
345 if (savefid != data->currfid) {
346 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
350 dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
351 data->currfid, data->currvid);
356 /* Phase 2 - core frequency transition */
357 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
359 u32 vcoreqfid, vcocurrfid, vcofiddiff, fid_interval, savevid = data->currvid;
361 if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
362 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
363 reqfid, data->currfid);
367 if (data->currfid == reqfid) {
368 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
372 dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
374 data->currfid, data->currvid, reqfid);
376 vcoreqfid = convert_fid_to_vco_fid(reqfid);
377 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
378 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
379 : vcoreqfid - vcocurrfid;
381 while (vcofiddiff > 2) {
382 (data->currfid & 1) ? (fid_interval = 1) : (fid_interval = 2);
384 if (reqfid > data->currfid) {
385 if (data->currfid > LO_FID_TABLE_TOP) {
386 if (write_new_fid(data, data->currfid + fid_interval)) {
391 (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
396 if (write_new_fid(data, data->currfid - fid_interval))
400 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
401 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
402 : vcoreqfid - vcocurrfid;
405 if (write_new_fid(data, reqfid))
408 if (query_current_values_with_pending_wait(data))
411 if (data->currfid != reqfid) {
413 "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
414 data->currfid, reqfid);
418 if (savevid != data->currvid) {
419 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
420 savevid, data->currvid);
424 dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
425 data->currfid, data->currvid);
430 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
431 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
433 u32 savefid = data->currfid;
434 u32 savereqvid = reqvid;
436 dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
438 data->currfid, data->currvid);
440 if (reqvid != data->currvid) {
441 if (write_new_vid(data, reqvid))
444 if (savefid != data->currfid) {
446 "ph3: bad fid change, save 0x%x, curr 0x%x\n",
447 savefid, data->currfid);
451 if (data->currvid != reqvid) {
453 "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
454 reqvid, data->currvid);
459 if (query_current_values_with_pending_wait(data))
462 if (savereqvid != data->currvid) {
463 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
467 if (savefid != data->currfid) {
468 dprintk("ph3 failed, currfid changed 0x%x\n",
473 dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
474 data->currfid, data->currvid);
479 static int check_supported_cpu(unsigned int cpu)
482 cpumask_of_cpu_ptr(cpu_mask, cpu);
483 u32 eax, ebx, ecx, edx;
486 oldmask = current->cpus_allowed;
487 set_cpus_allowed_ptr(current, cpu_mask);
489 if (smp_processor_id() != cpu) {
490 printk(KERN_ERR PFX "limiting to cpu %u failed\n", cpu);
494 if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
497 eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
498 if (((eax & CPUID_XFAM) != CPUID_XFAM_K8) &&
499 ((eax & CPUID_XFAM) < CPUID_XFAM_10H))
502 if ((eax & CPUID_XFAM) == CPUID_XFAM_K8) {
503 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
504 ((eax & CPUID_XMOD) > CPUID_XMOD_REV_MASK)) {
505 printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
509 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
510 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
512 "No frequency change capabilities detected\n");
516 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
517 if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
518 printk(KERN_INFO PFX "Power state transitions not supported\n");
521 } else { /* must be a HW Pstate capable processor */
522 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
523 if ((edx & USE_HW_PSTATE) == USE_HW_PSTATE)
524 cpu_family = CPU_HW_PSTATE;
532 set_cpus_allowed_ptr(current, &oldmask);
536 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
541 for (j = 0; j < data->numps; j++) {
542 if (pst[j].vid > LEAST_VID) {
543 printk(KERN_ERR PFX "vid %d invalid : 0x%x\n", j, pst[j].vid);
546 if (pst[j].vid < data->rvo) { /* vid + rvo >= 0 */
547 printk(KERN_ERR BFX "0 vid exceeded with pstate %d\n", j);
550 if (pst[j].vid < maxvid + data->rvo) { /* vid + rvo >= maxvid */
551 printk(KERN_ERR BFX "maxvid exceeded with pstate %d\n", j);
554 if (pst[j].fid > MAX_FID) {
555 printk(KERN_ERR BFX "maxfid exceeded with pstate %d\n", j);
558 if (j && (pst[j].fid < HI_FID_TABLE_BOTTOM)) {
559 /* Only first fid is allowed to be in "low" range */
560 printk(KERN_ERR BFX "two low fids - %d : 0x%x\n", j, pst[j].fid);
563 if (pst[j].fid < lastfid)
564 lastfid = pst[j].fid;
567 printk(KERN_ERR BFX "lastfid invalid\n");
570 if (lastfid > LO_FID_TABLE_TOP)
571 printk(KERN_INFO BFX "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 BFX "PSB table is not v1.4\n");
683 dprintk("flags: 0x%x\n", psb->flags1);
685 printk(KERN_ERR BFX "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 BFX "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 cpumask_of_cpu_ptr(cpu_mask, pol->cpu);
1021 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1024 unsigned int newstate;
1030 checkfid = data->currfid;
1031 checkvid = data->currvid;
1033 /* only run on specific CPU from here on */
1034 oldmask = current->cpus_allowed;
1035 set_cpus_allowed_ptr(current, cpu_mask);
1037 if (smp_processor_id() != pol->cpu) {
1038 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1042 if (pending_bit_stuck()) {
1043 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
1047 dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
1048 pol->cpu, targfreq, pol->min, pol->max, relation);
1050 if (query_current_values_with_pending_wait(data))
1053 if (cpu_family != CPU_HW_PSTATE) {
1054 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
1055 data->currfid, data->currvid);
1057 if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
1058 printk(KERN_INFO PFX
1059 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
1060 checkfid, data->currfid, checkvid, data->currvid);
1064 if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
1067 mutex_lock(&fidvid_mutex);
1069 powernow_k8_acpi_pst_values(data, newstate);
1071 if (cpu_family == CPU_HW_PSTATE)
1072 ret = transition_frequency_pstate(data, newstate);
1074 ret = transition_frequency_fidvid(data, newstate);
1076 printk(KERN_ERR PFX "transition frequency failed\n");
1078 mutex_unlock(&fidvid_mutex);
1081 mutex_unlock(&fidvid_mutex);
1083 if (cpu_family == CPU_HW_PSTATE)
1084 pol->cur = find_khz_freq_from_pstate(data->powernow_table, newstate);
1086 pol->cur = find_khz_freq_from_fid(data->currfid);
1090 set_cpus_allowed_ptr(current, &oldmask);
1094 /* Driver entry point to verify the policy and range of frequencies */
1095 static int powernowk8_verify(struct cpufreq_policy *pol)
1097 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1102 return cpufreq_frequency_table_verify(pol, data->powernow_table);
1105 /* per CPU init entry point to the driver */
1106 static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol)
1108 struct powernow_k8_data *data;
1110 cpumask_of_cpu_ptr_declare(newmask);
1113 if (!cpu_online(pol->cpu))
1116 if (!check_supported_cpu(pol->cpu))
1119 data = kzalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
1121 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
1125 data->cpu = pol->cpu;
1127 if (powernow_k8_cpu_init_acpi(data)) {
1129 * Use the PSB BIOS structure. This is only availabe on
1130 * an UP version, and is deprecated by AMD.
1132 if (num_online_cpus() != 1) {
1133 #ifndef CONFIG_ACPI_PROCESSOR
1134 printk(KERN_ERR PFX "ACPI Processor support is required "
1135 "for SMP systems but is absent. Please load the "
1136 "ACPI Processor module before starting this "
1139 printk(KERN_ERR PFX "Your BIOS does not provide ACPI "
1140 "_PSS objects in a way that Linux understands. "
1141 "Please report this to the Linux ACPI maintainers"
1142 " and complain to your BIOS vendor.\n");
1147 if (pol->cpu != 0) {
1148 printk(KERN_ERR PFX "No ACPI _PSS objects for CPU other than "
1149 "CPU0. Complain to your BIOS vendor.\n");
1153 rc = find_psb_table(data);
1160 /* only run on specific CPU from here on */
1161 oldmask = current->cpus_allowed;
1162 cpumask_of_cpu_ptr_next(newmask, pol->cpu);
1163 set_cpus_allowed_ptr(current, newmask);
1165 if (smp_processor_id() != pol->cpu) {
1166 printk(KERN_ERR PFX "limiting to cpu %u failed\n", pol->cpu);
1170 if (pending_bit_stuck()) {
1171 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1175 if (query_current_values_with_pending_wait(data))
1178 if (cpu_family == CPU_OPTERON)
1181 /* run on any CPU again */
1182 set_cpus_allowed_ptr(current, &oldmask);
1184 if (cpu_family == CPU_HW_PSTATE)
1185 pol->cpus = *newmask;
1187 pol->cpus = per_cpu(cpu_core_map, pol->cpu);
1188 data->available_cores = &(pol->cpus);
1190 /* Take a crude guess here.
1191 * That guess was in microseconds, so multiply with 1000 */
1192 pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
1193 + (3 * (1 << data->irt) * 10)) * 1000;
1195 if (cpu_family == CPU_HW_PSTATE)
1196 pol->cur = find_khz_freq_from_pstate(data->powernow_table, data->currpstate);
1198 pol->cur = find_khz_freq_from_fid(data->currfid);
1199 dprintk("policy current frequency %d kHz\n", pol->cur);
1201 /* min/max the cpu is capable of */
1202 if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1203 printk(KERN_ERR PFX "invalid powernow_table\n");
1204 powernow_k8_cpu_exit_acpi(data);
1205 kfree(data->powernow_table);
1210 cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1212 if (cpu_family == CPU_HW_PSTATE)
1213 dprintk("cpu_init done, current pstate 0x%x\n", data->currpstate);
1215 dprintk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1216 data->currfid, data->currvid);
1218 per_cpu(powernow_data, pol->cpu) = data;
1223 set_cpus_allowed_ptr(current, &oldmask);
1224 powernow_k8_cpu_exit_acpi(data);
1230 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1232 struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
1237 powernow_k8_cpu_exit_acpi(data);
1239 cpufreq_frequency_table_put_attr(pol->cpu);
1241 kfree(data->powernow_table);
1247 static unsigned int powernowk8_get (unsigned int cpu)
1249 struct powernow_k8_data *data;
1250 cpumask_t oldmask = current->cpus_allowed;
1251 cpumask_of_cpu_ptr(newmask, cpu);
1252 unsigned int khz = 0;
1255 first = first_cpu(per_cpu(cpu_core_map, cpu));
1256 data = per_cpu(powernow_data, first);
1261 set_cpus_allowed_ptr(current, newmask);
1262 if (smp_processor_id() != cpu) {
1264 "limiting to CPU %d failed in powernowk8_get\n", cpu);
1265 set_cpus_allowed_ptr(current, &oldmask);
1269 if (query_current_values_with_pending_wait(data))
1272 if (cpu_family == CPU_HW_PSTATE)
1273 khz = find_khz_freq_from_pstate(data->powernow_table,
1276 khz = find_khz_freq_from_fid(data->currfid);
1280 set_cpus_allowed_ptr(current, &oldmask);
1284 static struct freq_attr* powernow_k8_attr[] = {
1285 &cpufreq_freq_attr_scaling_available_freqs,
1289 static struct cpufreq_driver cpufreq_amd64_driver = {
1290 .verify = powernowk8_verify,
1291 .target = powernowk8_target,
1292 .init = powernowk8_cpu_init,
1293 .exit = __devexit_p(powernowk8_cpu_exit),
1294 .get = powernowk8_get,
1295 .name = "powernow-k8",
1296 .owner = THIS_MODULE,
1297 .attr = powernow_k8_attr,
1300 /* driver entry point for init */
1301 static int __cpuinit powernowk8_init(void)
1303 unsigned int i, supported_cpus = 0;
1305 for_each_online_cpu(i) {
1306 if (check_supported_cpu(i))
1310 if (supported_cpus == num_online_cpus()) {
1311 printk(KERN_INFO PFX "Found %d %s "
1312 "processors (%d cpu cores) (" VERSION ")\n",
1314 boot_cpu_data.x86_model_id, supported_cpus);
1315 return cpufreq_register_driver(&cpufreq_amd64_driver);
1321 /* driver entry point for term */
1322 static void __exit powernowk8_exit(void)
1326 cpufreq_unregister_driver(&cpufreq_amd64_driver);
1329 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com>");
1330 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1331 MODULE_LICENSE("GPL");
1333 late_initcall(powernowk8_init);
1334 module_exit(powernowk8_exit);