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>
38 #include <asm/delay.h>
40 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
41 #include <linux/acpi.h>
42 #include <acpi/processor.h>
45 #define PFX "powernow-k8: "
46 #define BFX PFX "BIOS error: "
47 #define VERSION "version 1.50.3"
48 #include "powernow-k8.h"
50 /* serialize freq changes */
51 static DECLARE_MUTEX(fidvid_sem);
53 static struct powernow_k8_data *powernow_data[NR_CPUS];
56 static cpumask_t cpu_core_map[1];
59 /* Return a frequency in MHz, given an input fid */
60 static u32 find_freq_from_fid(u32 fid)
62 return 800 + (fid * 100);
65 /* Return a frequency in KHz, given an input fid */
66 static u32 find_khz_freq_from_fid(u32 fid)
68 return 1000 * find_freq_from_fid(fid);
71 /* Return a voltage in miliVolts, given an input vid */
72 static u32 find_millivolts_from_vid(struct powernow_k8_data *data, u32 vid)
77 /* Return the vco fid for an input fid
79 * Each "low" fid has corresponding "high" fid, and you can get to "low" fids
80 * only from corresponding high fids. This returns "high" fid corresponding to
83 static u32 convert_fid_to_vco_fid(u32 fid)
85 if (fid < HI_FID_TABLE_BOTTOM) {
93 * Return 1 if the pending bit is set. Unless we just instructed the processor
94 * to transition to a new state, seeing this bit set is really bad news.
96 static int pending_bit_stuck(void)
100 rdmsr(MSR_FIDVID_STATUS, lo, hi);
101 return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0;
105 * Update the global current fid / vid values from the status msr.
106 * Returns 1 on error.
108 static int query_current_values_with_pending_wait(struct powernow_k8_data *data)
113 lo = MSR_S_LO_CHANGE_PENDING;
114 while (lo & MSR_S_LO_CHANGE_PENDING) {
115 if (i++ > 0x1000000) {
116 printk(KERN_ERR PFX "detected change pending stuck\n");
119 rdmsr(MSR_FIDVID_STATUS, lo, hi);
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;
164 if ((fid & INVALID_FID_MASK) || (data->currvid & INVALID_VID_MASK)) {
165 printk(KERN_ERR PFX "internal error - overflow on fid write\n");
169 lo = fid | (data->currvid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
171 dprintk("writing fid 0x%x, lo 0x%x, hi 0x%x\n",
172 fid, lo, data->plllock * PLL_LOCK_CONVERSION);
174 wrmsr(MSR_FIDVID_CTL, lo, data->plllock * PLL_LOCK_CONVERSION);
176 if (query_current_values_with_pending_wait(data))
181 if (savevid != data->currvid) {
182 printk(KERN_ERR PFX "vid change on fid trans, old 0x%x, new 0x%x\n",
183 savevid, data->currvid);
187 if (fid != data->currfid) {
188 printk(KERN_ERR PFX "fid trans failed, fid 0x%x, curr 0x%x\n", fid,
196 /* Write a new vid to the hardware */
197 static int write_new_vid(struct powernow_k8_data *data, u32 vid)
200 u32 savefid = data->currfid;
202 if ((data->currfid & INVALID_FID_MASK) || (vid & INVALID_VID_MASK)) {
203 printk(KERN_ERR PFX "internal error - overflow on vid write\n");
207 lo = data->currfid | (vid << MSR_C_LO_VID_SHIFT) | MSR_C_LO_INIT_FID_VID;
209 dprintk("writing vid 0x%x, lo 0x%x, hi 0x%x\n",
210 vid, lo, STOP_GRANT_5NS);
212 wrmsr(MSR_FIDVID_CTL, lo, STOP_GRANT_5NS);
214 if (query_current_values_with_pending_wait(data))
217 if (savefid != data->currfid) {
218 printk(KERN_ERR PFX "fid changed on vid trans, old 0x%x new 0x%x\n",
219 savefid, data->currfid);
223 if (vid != data->currvid) {
224 printk(KERN_ERR PFX "vid trans failed, vid 0x%x, curr 0x%x\n", vid,
233 * Reduce the vid by the max of step or reqvid.
234 * Decreasing vid codes represent increasing voltages:
235 * vid of 0 is 1.550V, vid of 0x1e is 0.800V, vid of VID_OFF is off.
237 static int decrease_vid_code_by_step(struct powernow_k8_data *data, u32 reqvid, u32 step)
239 if ((data->currvid - reqvid) > step)
240 reqvid = data->currvid - step;
242 if (write_new_vid(data, reqvid))
250 /* Change the fid and vid, by the 3 phases. */
251 static int transition_fid_vid(struct powernow_k8_data *data, u32 reqfid, u32 reqvid)
253 if (core_voltage_pre_transition(data, reqvid))
256 if (core_frequency_transition(data, reqfid))
259 if (core_voltage_post_transition(data, reqvid))
262 if (query_current_values_with_pending_wait(data))
265 if ((reqfid != data->currfid) || (reqvid != data->currvid)) {
266 printk(KERN_ERR PFX "failed (cpu%d): req 0x%x 0x%x, curr 0x%x 0x%x\n",
268 reqfid, reqvid, data->currfid, data->currvid);
272 dprintk("transitioned (cpu%d): new fid 0x%x, vid 0x%x\n",
273 smp_processor_id(), data->currfid, data->currvid);
278 /* Phase 1 - core voltage transition ... setup voltage */
279 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid)
281 u32 rvosteps = data->rvo;
282 u32 savefid = data->currfid;
285 dprintk("ph1 (cpu%d): start, currfid 0x%x, currvid 0x%x, reqvid 0x%x, rvo 0x%x\n",
287 data->currfid, data->currvid, reqvid, data->rvo);
289 rdmsr(MSR_FIDVID_STATUS, lo, maxvid);
290 maxvid = 0x1f & (maxvid >> 16);
291 dprintk("ph1 maxvid=0x%x\n", maxvid);
292 if (reqvid < maxvid) /* lower numbers are higher voltages */
295 while (data->currvid > reqvid) {
296 dprintk("ph1: curr 0x%x, req vid 0x%x\n",
297 data->currvid, reqvid);
298 if (decrease_vid_code_by_step(data, reqvid, data->vidmvs))
302 while ((rvosteps > 0) && ((data->rvo + data->currvid) > reqvid)) {
303 if (data->currvid == maxvid) {
306 dprintk("ph1: changing vid for rvo, req 0x%x\n",
308 if (decrease_vid_code_by_step(data, data->currvid - 1, 1))
314 if (query_current_values_with_pending_wait(data))
317 if (savefid != data->currfid) {
318 printk(KERN_ERR PFX "ph1 err, currfid changed 0x%x\n", data->currfid);
322 dprintk("ph1 complete, currfid 0x%x, currvid 0x%x\n",
323 data->currfid, data->currvid);
328 /* Phase 2 - core frequency transition */
329 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid)
331 u32 vcoreqfid, vcocurrfid, vcofiddiff, savevid = data->currvid;
333 if ((reqfid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
334 printk(KERN_ERR PFX "ph2: illegal lo-lo transition 0x%x 0x%x\n",
335 reqfid, data->currfid);
339 if (data->currfid == reqfid) {
340 printk(KERN_ERR PFX "ph2 null fid transition 0x%x\n", data->currfid);
344 dprintk("ph2 (cpu%d): starting, currfid 0x%x, currvid 0x%x, reqfid 0x%x\n",
346 data->currfid, data->currvid, reqfid);
348 vcoreqfid = convert_fid_to_vco_fid(reqfid);
349 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
350 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
351 : vcoreqfid - vcocurrfid;
353 while (vcofiddiff > 2) {
354 if (reqfid > data->currfid) {
355 if (data->currfid > LO_FID_TABLE_TOP) {
356 if (write_new_fid(data, data->currfid + 2)) {
361 (data, 2 + convert_fid_to_vco_fid(data->currfid))) {
366 if (write_new_fid(data, data->currfid - 2))
370 vcocurrfid = convert_fid_to_vco_fid(data->currfid);
371 vcofiddiff = vcocurrfid > vcoreqfid ? vcocurrfid - vcoreqfid
372 : vcoreqfid - vcocurrfid;
375 if (write_new_fid(data, reqfid))
378 if (query_current_values_with_pending_wait(data))
381 if (data->currfid != reqfid) {
383 "ph2: mismatch, failed fid transition, curr 0x%x, req 0x%x\n",
384 data->currfid, reqfid);
388 if (savevid != data->currvid) {
389 printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
390 savevid, data->currvid);
394 dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
395 data->currfid, data->currvid);
400 /* Phase 3 - core voltage transition flow ... jump to the final vid. */
401 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
403 u32 savefid = data->currfid;
404 u32 savereqvid = reqvid;
406 dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
408 data->currfid, data->currvid);
410 if (reqvid != data->currvid) {
411 if (write_new_vid(data, reqvid))
414 if (savefid != data->currfid) {
416 "ph3: bad fid change, save 0x%x, curr 0x%x\n",
417 savefid, data->currfid);
421 if (data->currvid != reqvid) {
423 "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
424 reqvid, data->currvid);
429 if (query_current_values_with_pending_wait(data))
432 if (savereqvid != data->currvid) {
433 dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
437 if (savefid != data->currfid) {
438 dprintk("ph3 failed, currfid changed 0x%x\n",
443 dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
444 data->currfid, data->currvid);
449 static int check_supported_cpu(unsigned int cpu)
451 cpumask_t oldmask = CPU_MASK_ALL;
452 u32 eax, ebx, ecx, edx;
455 oldmask = current->cpus_allowed;
456 set_cpus_allowed(current, cpumask_of_cpu(cpu));
459 if (smp_processor_id() != cpu) {
460 printk(KERN_ERR "limiting to cpu %u failed\n", cpu);
464 if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
467 eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
468 if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
469 ((eax & CPUID_XFAM) != CPUID_XFAM_K8) ||
470 ((eax & CPUID_XMOD) > CPUID_XMOD_REV_F)) {
471 printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
475 eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
476 if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
478 "No frequency change capabilities detected\n");
482 cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
483 if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
484 printk(KERN_INFO PFX "Power state transitions not supported\n");
491 set_cpus_allowed(current, oldmask);
497 static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
502 for (j = 0; j < data->numps; j++) {
503 if (pst[j].vid > LEAST_VID) {
504 printk(KERN_ERR PFX "vid %d invalid : 0x%x\n", j, pst[j].vid);
507 if (pst[j].vid < data->rvo) { /* vid + rvo >= 0 */
508 printk(KERN_ERR BFX "0 vid exceeded with pstate %d\n", j);
511 if (pst[j].vid < maxvid + data->rvo) { /* vid + rvo >= maxvid */
512 printk(KERN_ERR BFX "maxvid exceeded with pstate %d\n", j);
515 if ((pst[j].fid > MAX_FID)
517 || (j && (pst[j].fid < HI_FID_TABLE_BOTTOM))) {
518 /* Only first fid is allowed to be in "low" range */
519 printk(KERN_ERR PFX "two low fids - %d : 0x%x\n", j, pst[j].fid);
522 if (pst[j].fid < lastfid)
523 lastfid = pst[j].fid;
526 printk(KERN_ERR PFX "lastfid invalid\n");
529 if (lastfid > LO_FID_TABLE_TOP)
530 printk(KERN_INFO PFX "first fid not from lo freq table\n");
535 static void print_basics(struct powernow_k8_data *data)
538 for (j = 0; j < data->numps; j++) {
539 if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID)
540 printk(KERN_INFO PFX " %d : fid 0x%x (%d MHz), vid 0x%x (%d mV)\n", j,
541 data->powernow_table[j].index & 0xff,
542 data->powernow_table[j].frequency/1000,
543 data->powernow_table[j].index >> 8,
544 find_millivolts_from_vid(data, data->powernow_table[j].index >> 8));
547 printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
550 static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
552 struct cpufreq_frequency_table *powernow_table;
555 if (data->batps) { /* use ACPI support to get full speed on mains power */
556 printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
557 data->numps = data->batps;
560 for ( j=1; j<data->numps; j++ ) {
561 if (pst[j-1].fid >= pst[j].fid) {
562 printk(KERN_ERR PFX "PST out of sequence\n");
567 if (data->numps < 2) {
568 printk(KERN_ERR PFX "no p states to transition\n");
572 if (check_pst_table(data, pst, maxvid))
575 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
576 * (data->numps + 1)), GFP_KERNEL);
577 if (!powernow_table) {
578 printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
582 for (j = 0; j < data->numps; j++) {
583 powernow_table[j].index = pst[j].fid; /* lower 8 bits */
584 powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
585 powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
587 powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
588 powernow_table[data->numps].index = 0;
590 if (query_current_values_with_pending_wait(data)) {
591 kfree(powernow_table);
595 dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
596 data->powernow_table = powernow_table;
599 for (j = 0; j < data->numps; j++)
600 if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
603 dprintk("currfid/vid do not match PST, ignoring\n");
607 /* Find and validate the PSB/PST table in BIOS. */
608 static int find_psb_table(struct powernow_k8_data *data)
617 for (i = 0xc0000; i < 0xffff0; i += 0x10) {
618 /* Scan BIOS looking for the signature. */
619 /* It can not be at ffff0 - it is too big. */
621 psb = phys_to_virt(i);
622 if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
625 dprintk("found PSB header at 0x%p\n", psb);
627 dprintk("table vers: 0x%x\n", psb->tableversion);
628 if (psb->tableversion != PSB_VERSION_1_4) {
629 printk(KERN_INFO BFX "PSB table is not v1.4\n");
633 dprintk("flags: 0x%x\n", psb->flags1);
635 printk(KERN_ERR BFX "unknown flags\n");
639 data->vstable = psb->vstable;
640 dprintk("voltage stabilization time: %d(*20us)\n", data->vstable);
642 dprintk("flags2: 0x%x\n", psb->flags2);
643 data->rvo = psb->flags2 & 3;
644 data->irt = ((psb->flags2) >> 2) & 3;
645 mvs = ((psb->flags2) >> 4) & 3;
646 data->vidmvs = 1 << mvs;
647 data->batps = ((psb->flags2) >> 6) & 3;
649 dprintk("ramp voltage offset: %d\n", data->rvo);
650 dprintk("isochronous relief time: %d\n", data->irt);
651 dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);
653 dprintk("numpst: 0x%x\n", psb->num_tables);
654 cpst = psb->num_tables;
655 if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){
656 thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
657 if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) {
662 printk(KERN_ERR BFX "numpst must be 1\n");
666 data->plllock = psb->plllocktime;
667 dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
668 dprintk("maxfid: 0x%x\n", psb->maxfid);
669 dprintk("maxvid: 0x%x\n", psb->maxvid);
670 maxvid = psb->maxvid;
672 data->numps = psb->numps;
673 dprintk("numpstates: 0x%x\n", data->numps);
674 return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
677 * If you see this message, complain to BIOS manufacturer. If
678 * he tells you "we do not support Linux" or some similar
679 * nonsense, remember that Windows 2000 uses the same legacy
680 * mechanism that the old Linux PSB driver uses. Tell them it
681 * is broken with Windows 2000.
683 * The reference to the AMD documentation is chapter 9 in the
684 * BIOS and Kernel Developer's Guide, which is available on
687 printk(KERN_INFO PFX "BIOS error - no PSB or ACPI _PSS objects\n");
691 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
692 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
694 if (!data->acpi_data.state_count)
697 data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
698 data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
699 data->exttype = (data->acpi_data.states[index].control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
700 data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
701 data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
702 data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
705 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
709 struct cpufreq_frequency_table *powernow_table;
711 if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
712 dprintk("register performance failed: bad ACPI data\n");
716 /* verify the data contained in the ACPI structures */
717 if (data->acpi_data.state_count <= 1) {
718 dprintk("No ACPI P-States\n");
722 if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
723 (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
724 dprintk("Invalid control/status registers (%x - %x)\n",
725 data->acpi_data.control_register.space_id,
726 data->acpi_data.status_register.space_id);
730 /* fill in data->powernow_table */
731 powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
732 * (data->acpi_data.state_count + 1)), GFP_KERNEL);
733 if (!powernow_table) {
734 dprintk("powernow_table memory alloc failure\n");
738 for (i = 0; i < data->acpi_data.state_count; i++) {
740 u32 fid = data->acpi_data.states[i].status & FID_MASK;
741 u32 vid = (data->acpi_data.states[i].status >> VID_SHIFT) & VID_MASK;
743 u32 fid = data->acpi_data.states[i].control & FID_MASK;
744 u32 vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
747 dprintk(" %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
749 powernow_table[i].index = fid; /* lower 8 bits */
750 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
751 powernow_table[i].frequency = find_khz_freq_from_fid(fid);
753 /* verify frequency is OK */
754 if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
755 (powernow_table[i].frequency < (MIN_FREQ * 1000))) {
756 dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
757 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
761 /* verify voltage is OK - BIOSs are using "off" to indicate invalid */
762 if (vid == VID_OFF) {
763 dprintk("invalid vid %u, ignoring\n", vid);
764 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
768 /* verify only 1 entry from the lo frequency table */
769 if (fid < HI_FID_TABLE_BOTTOM) {
771 /* if both entries are the same, ignore this
774 if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||
775 (powernow_table[i].index != powernow_table[cntlofreq].index)) {
776 printk(KERN_ERR PFX "Too many lo freq table entries\n");
780 dprintk("double low frequency table entry, ignoring it.\n");
781 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
787 if (powernow_table[i].frequency != (data->acpi_data.states[i].core_frequency * 1000)) {
788 printk(KERN_INFO PFX "invalid freq entries %u kHz vs. %u kHz\n",
789 powernow_table[i].frequency,
790 (unsigned int) (data->acpi_data.states[i].core_frequency * 1000));
791 powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
796 powernow_table[data->acpi_data.state_count].frequency = CPUFREQ_TABLE_END;
797 powernow_table[data->acpi_data.state_count].index = 0;
798 data->powernow_table = powernow_table;
801 data->numps = data->acpi_data.state_count;
803 powernow_k8_acpi_pst_values(data, 0);
805 /* notify BIOS that we exist */
806 acpi_processor_notify_smm(THIS_MODULE);
811 kfree(powernow_table);
814 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
816 /* data->acpi_data.state_count informs us at ->exit() whether ACPI was used */
817 data->acpi_data.state_count = 0;
822 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
824 if (data->acpi_data.state_count)
825 acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
829 static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return -ENODEV; }
830 static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return; }
831 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index) { return; }
832 #endif /* CONFIG_X86_POWERNOW_K8_ACPI */
834 /* Take a frequency, and issue the fid/vid transition command */
835 static int transition_frequency(struct powernow_k8_data *data, unsigned int index)
840 struct cpufreq_freqs freqs;
842 dprintk("cpu %d transition to index %u\n", smp_processor_id(), index);
844 /* fid are the lower 8 bits of the index we stored into
845 * the cpufreq frequency table in find_psb_table, vid are
849 fid = data->powernow_table[index].index & 0xFF;
850 vid = (data->powernow_table[index].index & 0xFF00) >> 8;
852 dprintk("table matched fid 0x%x, giving vid 0x%x\n", fid, vid);
854 if (query_current_values_with_pending_wait(data))
857 if ((data->currvid == vid) && (data->currfid == fid)) {
858 dprintk("target matches current values (fid 0x%x, vid 0x%x)\n",
863 if ((fid < HI_FID_TABLE_BOTTOM) && (data->currfid < HI_FID_TABLE_BOTTOM)) {
865 "ignoring illegal change in lo freq table-%x to 0x%x\n",
870 dprintk("cpu %d, changing to fid 0x%x, vid 0x%x\n",
871 smp_processor_id(), fid, vid);
873 freqs.cpu = data->cpu;
874 freqs.old = find_khz_freq_from_fid(data->currfid);
875 freqs.new = find_khz_freq_from_fid(fid);
876 for_each_cpu_mask(i, cpu_core_map[data->cpu]) {
878 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
881 res = transition_fid_vid(data, fid, vid);
883 freqs.new = find_khz_freq_from_fid(data->currfid);
884 for_each_cpu_mask(i, cpu_core_map[data->cpu]) {
886 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
891 /* Driver entry point to switch to the target frequency */
892 static int powernowk8_target(struct cpufreq_policy *pol, unsigned targfreq, unsigned relation)
894 cpumask_t oldmask = CPU_MASK_ALL;
895 struct powernow_k8_data *data = powernow_data[pol->cpu];
896 u32 checkfid = data->currfid;
897 u32 checkvid = data->currvid;
898 unsigned int newstate;
902 /* only run on specific CPU from here on */
903 oldmask = current->cpus_allowed;
904 set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
907 if (smp_processor_id() != pol->cpu) {
908 printk(KERN_ERR "limiting to cpu %u failed\n", pol->cpu);
912 if (pending_bit_stuck()) {
913 printk(KERN_ERR PFX "failing targ, change pending bit set\n");
917 dprintk("targ: cpu %d, %d kHz, min %d, max %d, relation %d\n",
918 pol->cpu, targfreq, pol->min, pol->max, relation);
920 if (query_current_values_with_pending_wait(data)) {
925 dprintk("targ: curr fid 0x%x, vid 0x%x\n",
926 data->currfid, data->currvid);
928 if ((checkvid != data->currvid) || (checkfid != data->currfid)) {
930 "error - out of sync, fix 0x%x 0x%x, vid 0x%x 0x%x\n",
931 checkfid, data->currfid, checkvid, data->currvid);
934 if (cpufreq_frequency_table_target(pol, data->powernow_table, targfreq, relation, &newstate))
939 powernow_k8_acpi_pst_values(data, newstate);
941 if (transition_frequency(data, newstate)) {
942 printk(KERN_ERR PFX "transition frequency failed\n");
948 /* Update all the fid/vids of our siblings */
949 for_each_cpu_mask(i, cpu_core_map[pol->cpu]) {
950 powernow_data[i]->currvid = data->currvid;
951 powernow_data[i]->currfid = data->currfid;
955 pol->cur = find_khz_freq_from_fid(data->currfid);
959 set_cpus_allowed(current, oldmask);
965 /* Driver entry point to verify the policy and range of frequencies */
966 static int powernowk8_verify(struct cpufreq_policy *pol)
968 struct powernow_k8_data *data = powernow_data[pol->cpu];
970 return cpufreq_frequency_table_verify(pol, data->powernow_table);
973 /* per CPU init entry point to the driver */
974 static int __init powernowk8_cpu_init(struct cpufreq_policy *pol)
976 struct powernow_k8_data *data;
977 cpumask_t oldmask = CPU_MASK_ALL;
980 if (!check_supported_cpu(pol->cpu))
983 data = kmalloc(sizeof(struct powernow_k8_data), GFP_KERNEL);
985 printk(KERN_ERR PFX "unable to alloc powernow_k8_data");
988 memset(data,0,sizeof(struct powernow_k8_data));
990 data->cpu = pol->cpu;
992 if (powernow_k8_cpu_init_acpi(data)) {
994 * Use the PSB BIOS structure. This is only availabe on
995 * an UP version, and is deprecated by AMD.
998 if ((num_online_cpus() != 1) || (num_possible_cpus() != 1)) {
999 printk(KERN_ERR PFX "MP systems not supported by PSB BIOS structure\n");
1003 if (pol->cpu != 0) {
1004 printk(KERN_ERR PFX "init not cpu 0\n");
1008 rc = find_psb_table(data);
1015 /* only run on specific CPU from here on */
1016 oldmask = current->cpus_allowed;
1017 set_cpus_allowed(current, cpumask_of_cpu(pol->cpu));
1020 if (smp_processor_id() != pol->cpu) {
1021 printk(KERN_ERR "limiting to cpu %u failed\n", pol->cpu);
1025 if (pending_bit_stuck()) {
1026 printk(KERN_ERR PFX "failing init, change pending bit set\n");
1030 if (query_current_values_with_pending_wait(data))
1035 /* run on any CPU again */
1036 set_cpus_allowed(current, oldmask);
1039 pol->governor = CPUFREQ_DEFAULT_GOVERNOR;
1040 pol->cpus = cpu_core_map[pol->cpu];
1042 /* Take a crude guess here.
1043 * That guess was in microseconds, so multiply with 1000 */
1044 pol->cpuinfo.transition_latency = (((data->rvo + 8) * data->vstable * VST_UNITS_20US)
1045 + (3 * (1 << data->irt) * 10)) * 1000;
1047 pol->cur = find_khz_freq_from_fid(data->currfid);
1048 dprintk("policy current frequency %d kHz\n", pol->cur);
1050 /* min/max the cpu is capable of */
1051 if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) {
1052 printk(KERN_ERR PFX "invalid powernow_table\n");
1053 powernow_k8_cpu_exit_acpi(data);
1054 kfree(data->powernow_table);
1059 cpufreq_frequency_table_get_attr(data->powernow_table, pol->cpu);
1061 printk("cpu_init done, current fid 0x%x, vid 0x%x\n",
1062 data->currfid, data->currvid);
1064 for_each_cpu_mask(i, cpu_core_map[pol->cpu]) {
1065 powernow_data[i] = data;
1071 set_cpus_allowed(current, oldmask);
1073 powernow_k8_cpu_exit_acpi(data);
1079 static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
1081 struct powernow_k8_data *data = powernow_data[pol->cpu];
1086 powernow_k8_cpu_exit_acpi(data);
1088 cpufreq_frequency_table_put_attr(pol->cpu);
1090 kfree(data->powernow_table);
1096 static unsigned int powernowk8_get (unsigned int cpu)
1098 struct powernow_k8_data *data = powernow_data[cpu];
1099 cpumask_t oldmask = current->cpus_allowed;
1100 unsigned int khz = 0;
1102 set_cpus_allowed(current, cpumask_of_cpu(cpu));
1103 if (smp_processor_id() != cpu) {
1104 printk(KERN_ERR PFX "limiting to CPU %d failed in powernowk8_get\n", cpu);
1105 set_cpus_allowed(current, oldmask);
1110 if (query_current_values_with_pending_wait(data))
1113 khz = find_khz_freq_from_fid(data->currfid);
1116 preempt_enable_no_resched();
1117 set_cpus_allowed(current, oldmask);
1122 static struct freq_attr* powernow_k8_attr[] = {
1123 &cpufreq_freq_attr_scaling_available_freqs,
1127 static struct cpufreq_driver cpufreq_amd64_driver = {
1128 .verify = powernowk8_verify,
1129 .target = powernowk8_target,
1130 .init = powernowk8_cpu_init,
1131 .exit = __devexit_p(powernowk8_cpu_exit),
1132 .get = powernowk8_get,
1133 .name = "powernow-k8",
1134 .owner = THIS_MODULE,
1135 .attr = powernow_k8_attr,
1138 /* driver entry point for init */
1139 static int __init powernowk8_init(void)
1141 unsigned int i, supported_cpus = 0;
1143 for (i=0; i<NR_CPUS; i++) {
1146 if (check_supported_cpu(i))
1150 if (supported_cpus == num_online_cpus()) {
1151 printk(KERN_INFO PFX "Found %d AMD Athlon 64 / Opteron processors (" VERSION ")\n",
1153 return cpufreq_register_driver(&cpufreq_amd64_driver);
1159 /* driver entry point for term */
1160 static void __exit powernowk8_exit(void)
1164 cpufreq_unregister_driver(&cpufreq_amd64_driver);
1167 MODULE_AUTHOR("Paul Devriendt <paul.devriendt@amd.com> and Mark Langsdorf <mark.langsdorf@amd.com.");
1168 MODULE_DESCRIPTION("AMD Athlon 64 and Opteron processor frequency driver.");
1169 MODULE_LICENSE("GPL");
1171 late_initcall(powernowk8_init);
1172 module_exit(powernowk8_exit);