Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * AMD K7 Powernow driver. | |
f4432c5c | 3 | * (C) 2003 Dave Jones on behalf of SuSE Labs. |
1da177e4 LT |
4 | * (C) 2003-2004 Dave Jones <davej@redhat.com> |
5 | * | |
6 | * Licensed under the terms of the GNU GPL License version 2. | |
7 | * Based upon datasheets & sample CPUs kindly provided by AMD. | |
8 | * | |
b9e7638a DJ |
9 | * Errata 5: |
10 | * CPU may fail to execute a FID/VID change in presence of interrupt. | |
11 | * - We cli/sti on stepping A0 CPUs around the FID/VID transition. | |
12 | * Errata 15: | |
13 | * CPU with half frequency multipliers may hang upon wakeup from disconnect. | |
14 | * - We disable half multipliers if ACPI is used on A0 stepping CPUs. | |
1da177e4 LT |
15 | */ |
16 | ||
1da177e4 LT |
17 | #include <linux/kernel.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/moduleparam.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/cpufreq.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/dmi.h> | |
b9e7638a DJ |
25 | #include <linux/timex.h> |
26 | #include <linux/io.h> | |
1da177e4 | 27 | |
b9e7638a | 28 | #include <asm/timer.h> /* Needed for recalibrate_cpu_khz() */ |
1da177e4 | 29 | #include <asm/msr.h> |
1da177e4 LT |
30 | #include <asm/system.h> |
31 | ||
32 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
33 | #include <linux/acpi.h> | |
34 | #include <acpi/processor.h> | |
35 | #endif | |
36 | ||
37 | #include "powernow-k7.h" | |
38 | ||
39 | #define PFX "powernow: " | |
40 | ||
41 | ||
42 | struct psb_s { | |
43 | u8 signature[10]; | |
44 | u8 tableversion; | |
45 | u8 flags; | |
46 | u16 settlingtime; | |
47 | u8 reserved1; | |
48 | u8 numpst; | |
49 | }; | |
50 | ||
51 | struct pst_s { | |
52 | u32 cpuid; | |
53 | u8 fsbspeed; | |
54 | u8 maxfid; | |
55 | u8 startvid; | |
56 | u8 numpstates; | |
57 | }; | |
58 | ||
59 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
60 | union powernow_acpi_control_t { | |
61 | struct { | |
62 | unsigned long fid:5, | |
b9e7638a DJ |
63 | vid:5, |
64 | sgtc:20, | |
65 | res1:2; | |
1da177e4 LT |
66 | } bits; |
67 | unsigned long val; | |
68 | }; | |
69 | #endif | |
70 | ||
71 | #ifdef CONFIG_CPU_FREQ_DEBUG | |
72 | /* divide by 1000 to get VCore voltage in V. */ | |
bd5ab26a | 73 | static const int mobile_vid_table[32] = { |
1da177e4 LT |
74 | 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650, |
75 | 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0, | |
76 | 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100, | |
77 | 1075, 1050, 1025, 1000, 975, 950, 925, 0, | |
78 | }; | |
79 | #endif | |
80 | ||
81 | /* divide by 10 to get FID. */ | |
bd5ab26a | 82 | static const int fid_codes[32] = { |
1da177e4 LT |
83 | 110, 115, 120, 125, 50, 55, 60, 65, |
84 | 70, 75, 80, 85, 90, 95, 100, 105, | |
85 | 30, 190, 40, 200, 130, 135, 140, 210, | |
86 | 150, 225, 160, 165, 170, 180, -1, -1, | |
87 | }; | |
88 | ||
89 | /* This parameter is used in order to force ACPI instead of legacy method for | |
90 | * configuration purpose. | |
91 | */ | |
92 | ||
93 | static int acpi_force; | |
94 | ||
95 | static struct cpufreq_frequency_table *powernow_table; | |
96 | ||
97 | static unsigned int can_scale_bus; | |
98 | static unsigned int can_scale_vid; | |
fff78ad5 | 99 | static unsigned int minimum_speed = -1; |
1da177e4 LT |
100 | static unsigned int maximum_speed; |
101 | static unsigned int number_scales; | |
102 | static unsigned int fsb; | |
103 | static unsigned int latency; | |
104 | static char have_a0; | |
105 | ||
b9e7638a DJ |
106 | #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, \ |
107 | "powernow-k7", msg) | |
1da177e4 LT |
108 | |
109 | static int check_fsb(unsigned int fsbspeed) | |
110 | { | |
111 | int delta; | |
112 | unsigned int f = fsb / 1000; | |
113 | ||
114 | delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed; | |
b9e7638a | 115 | return delta < 5; |
1da177e4 LT |
116 | } |
117 | ||
118 | static int check_powernow(void) | |
119 | { | |
92cb7612 | 120 | struct cpuinfo_x86 *c = &cpu_data(0); |
1da177e4 LT |
121 | unsigned int maxei, eax, ebx, ecx, edx; |
122 | ||
b9e7638a | 123 | if ((c->x86_vendor != X86_VENDOR_AMD) || (c->x86 != 6)) { |
1da177e4 | 124 | #ifdef MODULE |
b9e7638a DJ |
125 | printk(KERN_INFO PFX "This module only works with " |
126 | "AMD K7 CPUs\n"); | |
1da177e4 LT |
127 | #endif |
128 | return 0; | |
129 | } | |
130 | ||
131 | /* Get maximum capabilities */ | |
b9e7638a | 132 | maxei = cpuid_eax(0x80000000); |
1da177e4 LT |
133 | if (maxei < 0x80000007) { /* Any powernow info ? */ |
134 | #ifdef MODULE | |
b9e7638a | 135 | printk(KERN_INFO PFX "No powernow capabilities detected\n"); |
1da177e4 LT |
136 | #endif |
137 | return 0; | |
138 | } | |
139 | ||
140 | if ((c->x86_model == 6) && (c->x86_mask == 0)) { | |
b9e7638a DJ |
141 | printk(KERN_INFO PFX "K7 660[A0] core detected, " |
142 | "enabling errata workarounds\n"); | |
1da177e4 LT |
143 | have_a0 = 1; |
144 | } | |
145 | ||
146 | cpuid(0x80000007, &eax, &ebx, &ecx, &edx); | |
147 | ||
148 | /* Check we can actually do something before we say anything.*/ | |
149 | if (!(edx & (1 << 1 | 1 << 2))) | |
150 | return 0; | |
151 | ||
b9e7638a | 152 | printk(KERN_INFO PFX "PowerNOW! Technology present. Can scale: "); |
1da177e4 LT |
153 | |
154 | if (edx & 1 << 1) { | |
b9e7638a DJ |
155 | printk("frequency"); |
156 | can_scale_bus = 1; | |
1da177e4 LT |
157 | } |
158 | ||
159 | if ((edx & (1 << 1 | 1 << 2)) == 0x6) | |
b9e7638a | 160 | printk(" and "); |
1da177e4 LT |
161 | |
162 | if (edx & 1 << 2) { | |
b9e7638a DJ |
163 | printk("voltage"); |
164 | can_scale_vid = 1; | |
1da177e4 LT |
165 | } |
166 | ||
b9e7638a | 167 | printk(".\n"); |
1da177e4 LT |
168 | return 1; |
169 | } | |
170 | ||
d38e73e8 | 171 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
b9e7638a DJ |
172 | static void invalidate_entry(unsigned int entry) |
173 | { | |
174 | powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID; | |
175 | } | |
d38e73e8 | 176 | #endif |
1da177e4 | 177 | |
b9e7638a | 178 | static int get_ranges(unsigned char *pst) |
1da177e4 LT |
179 | { |
180 | unsigned int j; | |
181 | unsigned int speed; | |
182 | u8 fid, vid; | |
183 | ||
b9e7638a DJ |
184 | powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * |
185 | (number_scales + 1)), GFP_KERNEL); | |
1da177e4 LT |
186 | if (!powernow_table) |
187 | return -ENOMEM; | |
1da177e4 | 188 | |
b9e7638a | 189 | for (j = 0 ; j < number_scales; j++) { |
1da177e4 LT |
190 | fid = *pst++; |
191 | ||
192 | powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10; | |
193 | powernow_table[j].index = fid; /* lower 8 bits */ | |
194 | ||
195 | speed = powernow_table[j].frequency; | |
196 | ||
b9e7638a | 197 | if ((fid_codes[fid] % 10) == 5) { |
1da177e4 LT |
198 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
199 | if (have_a0 == 1) | |
b9e7638a | 200 | invalidate_entry(j); |
1da177e4 LT |
201 | #endif |
202 | } | |
203 | ||
204 | if (speed < minimum_speed) | |
205 | minimum_speed = speed; | |
206 | if (speed > maximum_speed) | |
207 | maximum_speed = speed; | |
208 | ||
209 | vid = *pst++; | |
210 | powernow_table[j].index |= (vid << 8); /* upper 8 bits */ | |
211 | ||
b9e7638a | 212 | dprintk(" FID: 0x%x (%d.%dx [%dMHz]) " |
32ee8c3e DJ |
213 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
214 | fid_codes[fid] % 10, speed/1000, vid, | |
1da177e4 LT |
215 | mobile_vid_table[vid]/1000, |
216 | mobile_vid_table[vid]%1000); | |
217 | } | |
218 | powernow_table[number_scales].frequency = CPUFREQ_TABLE_END; | |
219 | powernow_table[number_scales].index = 0; | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | ||
225 | static void change_FID(int fid) | |
226 | { | |
227 | union msr_fidvidctl fidvidctl; | |
228 | ||
b9e7638a | 229 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
230 | if (fidvidctl.bits.FID != fid) { |
231 | fidvidctl.bits.SGTC = latency; | |
232 | fidvidctl.bits.FID = fid; | |
233 | fidvidctl.bits.VIDC = 0; | |
234 | fidvidctl.bits.FIDC = 1; | |
b9e7638a | 235 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
236 | } |
237 | } | |
238 | ||
239 | ||
240 | static void change_VID(int vid) | |
241 | { | |
242 | union msr_fidvidctl fidvidctl; | |
243 | ||
b9e7638a | 244 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
245 | if (fidvidctl.bits.VID != vid) { |
246 | fidvidctl.bits.SGTC = latency; | |
247 | fidvidctl.bits.VID = vid; | |
248 | fidvidctl.bits.FIDC = 0; | |
249 | fidvidctl.bits.VIDC = 1; | |
b9e7638a | 250 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
251 | } |
252 | } | |
253 | ||
254 | ||
b9e7638a | 255 | static void change_speed(unsigned int index) |
1da177e4 LT |
256 | { |
257 | u8 fid, vid; | |
258 | struct cpufreq_freqs freqs; | |
259 | union msr_fidvidstatus fidvidstatus; | |
260 | int cfid; | |
261 | ||
262 | /* fid are the lower 8 bits of the index we stored into | |
263 | * the cpufreq frequency table in powernow_decode_bios, | |
264 | * vid are the upper 8 bits. | |
265 | */ | |
266 | ||
267 | fid = powernow_table[index].index & 0xFF; | |
268 | vid = (powernow_table[index].index & 0xFF00) >> 8; | |
269 | ||
270 | freqs.cpu = 0; | |
271 | ||
b9e7638a | 272 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 LT |
273 | cfid = fidvidstatus.bits.CFID; |
274 | freqs.old = fsb * fid_codes[cfid] / 10; | |
275 | ||
276 | freqs.new = powernow_table[index].frequency; | |
277 | ||
278 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
279 | ||
280 | /* Now do the magic poking into the MSRs. */ | |
281 | ||
282 | if (have_a0 == 1) /* A0 errata 5 */ | |
283 | local_irq_disable(); | |
284 | ||
285 | if (freqs.old > freqs.new) { | |
286 | /* Going down, so change FID first */ | |
287 | change_FID(fid); | |
288 | change_VID(vid); | |
289 | } else { | |
290 | /* Going up, so change VID first */ | |
291 | change_VID(vid); | |
292 | change_FID(fid); | |
293 | } | |
294 | ||
295 | ||
296 | if (have_a0 == 1) | |
297 | local_irq_enable(); | |
298 | ||
299 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
300 | } | |
301 | ||
302 | ||
303 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
304 | ||
305 | static struct acpi_processor_performance *acpi_processor_perf; | |
306 | ||
307 | static int powernow_acpi_init(void) | |
308 | { | |
309 | int i; | |
310 | int retval = 0; | |
311 | union powernow_acpi_control_t pc; | |
312 | ||
313 | if (acpi_processor_perf != NULL && powernow_table != NULL) { | |
314 | retval = -EINVAL; | |
315 | goto err0; | |
316 | } | |
317 | ||
bfdc708d | 318 | acpi_processor_perf = kzalloc(sizeof(struct acpi_processor_performance), |
1da177e4 | 319 | GFP_KERNEL); |
1da177e4 LT |
320 | if (!acpi_processor_perf) { |
321 | retval = -ENOMEM; | |
322 | goto err0; | |
323 | } | |
324 | ||
eaa95840 | 325 | if (!zalloc_cpumask_var(&acpi_processor_perf->shared_cpu_map, |
2fdf66b4 RR |
326 | GFP_KERNEL)) { |
327 | retval = -ENOMEM; | |
328 | goto err05; | |
329 | } | |
330 | ||
1da177e4 LT |
331 | if (acpi_processor_register_performance(acpi_processor_perf, 0)) { |
332 | retval = -EIO; | |
333 | goto err1; | |
334 | } | |
335 | ||
b9e7638a DJ |
336 | if (acpi_processor_perf->control_register.space_id != |
337 | ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
1da177e4 LT |
338 | retval = -ENODEV; |
339 | goto err2; | |
340 | } | |
341 | ||
b9e7638a DJ |
342 | if (acpi_processor_perf->status_register.space_id != |
343 | ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
1da177e4 LT |
344 | retval = -ENODEV; |
345 | goto err2; | |
346 | } | |
347 | ||
348 | number_scales = acpi_processor_perf->state_count; | |
349 | ||
350 | if (number_scales < 2) { | |
351 | retval = -ENODEV; | |
352 | goto err2; | |
353 | } | |
354 | ||
b9e7638a DJ |
355 | powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * |
356 | (number_scales + 1)), GFP_KERNEL); | |
1da177e4 LT |
357 | if (!powernow_table) { |
358 | retval = -ENOMEM; | |
359 | goto err2; | |
360 | } | |
361 | ||
1da177e4 LT |
362 | pc.val = (unsigned long) acpi_processor_perf->states[0].control; |
363 | for (i = 0; i < number_scales; i++) { | |
364 | u8 fid, vid; | |
dc2585eb DD |
365 | struct acpi_processor_px *state = |
366 | &acpi_processor_perf->states[i]; | |
367 | unsigned int speed, speed_mhz; | |
1da177e4 | 368 | |
dc2585eb | 369 | pc.val = (unsigned long) state->control; |
b9e7638a | 370 | dprintk("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n", |
1da177e4 | 371 | i, |
dc2585eb DD |
372 | (u32) state->core_frequency, |
373 | (u32) state->power, | |
374 | (u32) state->transition_latency, | |
375 | (u32) state->control, | |
1da177e4 LT |
376 | pc.bits.sgtc); |
377 | ||
378 | vid = pc.bits.vid; | |
379 | fid = pc.bits.fid; | |
380 | ||
381 | powernow_table[i].frequency = fsb * fid_codes[fid] / 10; | |
382 | powernow_table[i].index = fid; /* lower 8 bits */ | |
383 | powernow_table[i].index |= (vid << 8); /* upper 8 bits */ | |
384 | ||
385 | speed = powernow_table[i].frequency; | |
dc2585eb DD |
386 | speed_mhz = speed / 1000; |
387 | ||
388 | /* processor_perflib will multiply the MHz value by 1000 to | |
389 | * get a KHz value (e.g. 1266000). However, powernow-k7 works | |
390 | * with true KHz values (e.g. 1266768). To ensure that all | |
391 | * powernow frequencies are available, we must ensure that | |
392 | * ACPI doesn't restrict them, so we round up the MHz value | |
393 | * to ensure that perflib's computed KHz value is greater than | |
394 | * or equal to powernow's KHz value. | |
395 | */ | |
396 | if (speed % 1000 > 0) | |
397 | speed_mhz++; | |
1da177e4 | 398 | |
b9e7638a | 399 | if ((fid_codes[fid] % 10) == 5) { |
1da177e4 | 400 | if (have_a0 == 1) |
b9e7638a | 401 | invalidate_entry(i); |
1da177e4 LT |
402 | } |
403 | ||
b9e7638a | 404 | dprintk(" FID: 0x%x (%d.%dx [%dMHz]) " |
32ee8c3e | 405 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
dc2585eb | 406 | fid_codes[fid] % 10, speed_mhz, vid, |
1da177e4 LT |
407 | mobile_vid_table[vid]/1000, |
408 | mobile_vid_table[vid]%1000); | |
409 | ||
dc2585eb DD |
410 | if (state->core_frequency != speed_mhz) { |
411 | state->core_frequency = speed_mhz; | |
412 | dprintk(" Corrected ACPI frequency to %d\n", | |
413 | speed_mhz); | |
414 | } | |
415 | ||
1da177e4 LT |
416 | if (latency < pc.bits.sgtc) |
417 | latency = pc.bits.sgtc; | |
418 | ||
419 | if (speed < minimum_speed) | |
420 | minimum_speed = speed; | |
421 | if (speed > maximum_speed) | |
422 | maximum_speed = speed; | |
423 | } | |
424 | ||
425 | powernow_table[i].frequency = CPUFREQ_TABLE_END; | |
426 | powernow_table[i].index = 0; | |
427 | ||
428 | /* notify BIOS that we exist */ | |
429 | acpi_processor_notify_smm(THIS_MODULE); | |
430 | ||
431 | return 0; | |
432 | ||
433 | err2: | |
434 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
435 | err1: | |
2fdf66b4 RR |
436 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
437 | err05: | |
1da177e4 LT |
438 | kfree(acpi_processor_perf); |
439 | err0: | |
b9e7638a DJ |
440 | printk(KERN_WARNING PFX "ACPI perflib can not be used on " |
441 | "this platform\n"); | |
1da177e4 LT |
442 | acpi_processor_perf = NULL; |
443 | return retval; | |
444 | } | |
445 | #else | |
446 | static int powernow_acpi_init(void) | |
447 | { | |
448 | printk(KERN_INFO PFX "no support for ACPI processor found." | |
449 | " Please recompile your kernel with ACPI processor\n"); | |
450 | return -EINVAL; | |
451 | } | |
452 | #endif | |
453 | ||
b9e7638a DJ |
454 | static void print_pst_entry(struct pst_s *pst, unsigned int j) |
455 | { | |
456 | dprintk("PST:%d (@%p)\n", j, pst); | |
457 | dprintk(" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n", | |
458 | pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid); | |
459 | } | |
460 | ||
461 | static int powernow_decode_bios(int maxfid, int startvid) | |
1da177e4 LT |
462 | { |
463 | struct psb_s *psb; | |
464 | struct pst_s *pst; | |
465 | unsigned int i, j; | |
466 | unsigned char *p; | |
467 | unsigned int etuple; | |
468 | unsigned int ret; | |
469 | ||
470 | etuple = cpuid_eax(0x80000001); | |
471 | ||
b9e7638a | 472 | for (i = 0xC0000; i < 0xffff0 ; i += 16) { |
1da177e4 LT |
473 | |
474 | p = phys_to_virt(i); | |
475 | ||
b9e7638a DJ |
476 | if (memcmp(p, "AMDK7PNOW!", 10) == 0) { |
477 | dprintk("Found PSB header at %p\n", p); | |
1da177e4 | 478 | psb = (struct psb_s *) p; |
b9e7638a | 479 | dprintk("Table version: 0x%x\n", psb->tableversion); |
1da177e4 | 480 | if (psb->tableversion != 0x12) { |
b9e7638a DJ |
481 | printk(KERN_INFO PFX "Sorry, only v1.2 tables" |
482 | " supported right now\n"); | |
1da177e4 LT |
483 | return -ENODEV; |
484 | } | |
485 | ||
b9e7638a DJ |
486 | dprintk("Flags: 0x%x\n", psb->flags); |
487 | if ((psb->flags & 1) == 0) | |
488 | dprintk("Mobile voltage regulator\n"); | |
489 | else | |
490 | dprintk("Desktop voltage regulator\n"); | |
1da177e4 LT |
491 | |
492 | latency = psb->settlingtime; | |
493 | if (latency < 100) { | |
b9e7638a DJ |
494 | printk(KERN_INFO PFX "BIOS set settling time " |
495 | "to %d microseconds. " | |
496 | "Should be at least 100. " | |
497 | "Correcting.\n", latency); | |
1da177e4 LT |
498 | latency = 100; |
499 | } | |
b9e7638a DJ |
500 | dprintk("Settling Time: %d microseconds.\n", |
501 | psb->settlingtime); | |
502 | dprintk("Has %d PST tables. (Only dumping ones " | |
503 | "relevant to this CPU).\n", | |
504 | psb->numpst); | |
1da177e4 | 505 | |
b9e7638a | 506 | p += sizeof(struct psb_s); |
1da177e4 LT |
507 | |
508 | pst = (struct pst_s *) p; | |
509 | ||
b9e7638a | 510 | for (j = 0; j < psb->numpst; j++) { |
1da177e4 LT |
511 | pst = (struct pst_s *) p; |
512 | number_scales = pst->numpstates; | |
513 | ||
b9e7638a DJ |
514 | if ((etuple == pst->cpuid) && |
515 | check_fsb(pst->fsbspeed) && | |
516 | (maxfid == pst->maxfid) && | |
517 | (startvid == pst->startvid)) { | |
518 | print_pst_entry(pst, j); | |
519 | p = (char *)pst + sizeof(struct pst_s); | |
520 | ret = get_ranges(p); | |
1da177e4 | 521 | return ret; |
1da177e4 | 522 | } else { |
8cbe0169 | 523 | unsigned int k; |
b9e7638a DJ |
524 | p = (char *)pst + sizeof(struct pst_s); |
525 | for (k = 0; k < number_scales; k++) | |
526 | p += 2; | |
1da177e4 LT |
527 | } |
528 | } | |
b9e7638a DJ |
529 | printk(KERN_INFO PFX "No PST tables match this cpuid " |
530 | "(0x%x)\n", etuple); | |
531 | printk(KERN_INFO PFX "This is indicative of a broken " | |
532 | "BIOS.\n"); | |
1da177e4 LT |
533 | |
534 | return -EINVAL; | |
535 | } | |
536 | p++; | |
537 | } | |
538 | ||
539 | return -ENODEV; | |
540 | } | |
541 | ||
542 | ||
b9e7638a | 543 | static int powernow_target(struct cpufreq_policy *policy, |
1da177e4 LT |
544 | unsigned int target_freq, |
545 | unsigned int relation) | |
546 | { | |
547 | unsigned int newstate; | |
548 | ||
b9e7638a DJ |
549 | if (cpufreq_frequency_table_target(policy, powernow_table, target_freq, |
550 | relation, &newstate)) | |
1da177e4 LT |
551 | return -EINVAL; |
552 | ||
553 | change_speed(newstate); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | ||
b9e7638a | 559 | static int powernow_verify(struct cpufreq_policy *policy) |
1da177e4 LT |
560 | { |
561 | return cpufreq_frequency_table_verify(policy, powernow_table); | |
562 | } | |
563 | ||
564 | /* | |
565 | * We use the fact that the bus frequency is somehow | |
566 | * a multiple of 100000/3 khz, then we compute sgtc according | |
567 | * to this multiple. | |
568 | * That way, we match more how AMD thinks all of that work. | |
569 | * We will then get the same kind of behaviour already tested under | |
570 | * the "well-known" other OS. | |
571 | */ | |
572 | static int __init fixup_sgtc(void) | |
573 | { | |
574 | unsigned int sgtc; | |
575 | unsigned int m; | |
576 | ||
577 | m = fsb / 3333; | |
578 | if ((m % 10) >= 5) | |
579 | m += 5; | |
580 | ||
581 | m /= 10; | |
582 | ||
583 | sgtc = 100 * m * latency; | |
584 | sgtc = sgtc / 3; | |
585 | if (sgtc > 0xfffff) { | |
586 | printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc); | |
587 | sgtc = 0xfffff; | |
588 | } | |
589 | return sgtc; | |
590 | } | |
591 | ||
592 | static unsigned int powernow_get(unsigned int cpu) | |
593 | { | |
594 | union msr_fidvidstatus fidvidstatus; | |
595 | unsigned int cfid; | |
596 | ||
597 | if (cpu) | |
598 | return 0; | |
b9e7638a | 599 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 LT |
600 | cfid = fidvidstatus.bits.CFID; |
601 | ||
b9e7638a | 602 | return fsb * fid_codes[cfid] / 10; |
1da177e4 LT |
603 | } |
604 | ||
605 | ||
0b4b5dde | 606 | static int __init acer_cpufreq_pst(const struct dmi_system_id *d) |
1da177e4 | 607 | { |
b9e7638a DJ |
608 | printk(KERN_WARNING PFX |
609 | "%s laptop with broken PST tables in BIOS detected.\n", | |
610 | d->ident); | |
611 | printk(KERN_WARNING PFX | |
612 | "You need to downgrade to 3A21 (09/09/2002), or try a newer " | |
613 | "BIOS than 3A71 (01/20/2003)\n"); | |
614 | printk(KERN_WARNING PFX | |
615 | "cpufreq scaling has been disabled as a result of this.\n"); | |
1da177e4 LT |
616 | return 0; |
617 | } | |
618 | ||
619 | /* | |
620 | * Some Athlon laptops have really fucked PST tables. | |
621 | * A BIOS update is all that can save them. | |
622 | * Mention this, and disable cpufreq. | |
623 | */ | |
624 | static struct dmi_system_id __initdata powernow_dmi_table[] = { | |
625 | { | |
626 | .callback = acer_cpufreq_pst, | |
627 | .ident = "Acer Aspire", | |
628 | .matches = { | |
629 | DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"), | |
630 | DMI_MATCH(DMI_BIOS_VERSION, "3A71"), | |
631 | }, | |
632 | }, | |
633 | { } | |
634 | }; | |
635 | ||
b9e7638a | 636 | static int __init powernow_cpu_init(struct cpufreq_policy *policy) |
1da177e4 LT |
637 | { |
638 | union msr_fidvidstatus fidvidstatus; | |
639 | int result; | |
640 | ||
641 | if (policy->cpu != 0) | |
642 | return -ENODEV; | |
643 | ||
b9e7638a | 644 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 | 645 | |
436fe7b8 | 646 | recalibrate_cpu_khz(); |
91350ed4 DJ |
647 | |
648 | fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID]; | |
1da177e4 LT |
649 | if (!fsb) { |
650 | printk(KERN_WARNING PFX "can not determine bus frequency\n"); | |
651 | return -EINVAL; | |
652 | } | |
7eb53d88 | 653 | dprintk("FSB: %3dMHz\n", fsb/1000); |
1da177e4 LT |
654 | |
655 | if (dmi_check_system(powernow_dmi_table) || acpi_force) { | |
b9e7638a DJ |
656 | printk(KERN_INFO PFX "PSB/PST known to be broken. " |
657 | "Trying ACPI instead\n"); | |
1da177e4 LT |
658 | result = powernow_acpi_init(); |
659 | } else { | |
b9e7638a DJ |
660 | result = powernow_decode_bios(fidvidstatus.bits.MFID, |
661 | fidvidstatus.bits.SVID); | |
1da177e4 | 662 | if (result) { |
b9e7638a | 663 | printk(KERN_INFO PFX "Trying ACPI perflib\n"); |
1da177e4 LT |
664 | maximum_speed = 0; |
665 | minimum_speed = -1; | |
666 | latency = 0; | |
667 | result = powernow_acpi_init(); | |
668 | if (result) { | |
b9e7638a DJ |
669 | printk(KERN_INFO PFX |
670 | "ACPI and legacy methods failed\n"); | |
1da177e4 LT |
671 | } |
672 | } else { | |
673 | /* SGTC use the bus clock as timer */ | |
674 | latency = fixup_sgtc(); | |
675 | printk(KERN_INFO PFX "SGTC: %d\n", latency); | |
676 | } | |
677 | } | |
678 | ||
679 | if (result) | |
680 | return result; | |
681 | ||
b9e7638a | 682 | printk(KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n", |
1da177e4 LT |
683 | minimum_speed/1000, maximum_speed/1000); |
684 | ||
b9e7638a DJ |
685 | policy->cpuinfo.transition_latency = |
686 | cpufreq_scale(2000000UL, fsb, latency); | |
1da177e4 LT |
687 | |
688 | policy->cur = powernow_get(0); | |
689 | ||
690 | cpufreq_frequency_table_get_attr(powernow_table, policy->cpu); | |
691 | ||
692 | return cpufreq_frequency_table_cpuinfo(policy, powernow_table); | |
693 | } | |
694 | ||
b9e7638a DJ |
695 | static int powernow_cpu_exit(struct cpufreq_policy *policy) |
696 | { | |
1da177e4 LT |
697 | cpufreq_frequency_table_put_attr(policy->cpu); |
698 | ||
699 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
700 | if (acpi_processor_perf) { | |
701 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
2fdf66b4 | 702 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
1da177e4 LT |
703 | kfree(acpi_processor_perf); |
704 | } | |
705 | #endif | |
706 | ||
4ae6673e | 707 | kfree(powernow_table); |
1da177e4 LT |
708 | return 0; |
709 | } | |
710 | ||
b9e7638a | 711 | static struct freq_attr *powernow_table_attr[] = { |
1da177e4 LT |
712 | &cpufreq_freq_attr_scaling_available_freqs, |
713 | NULL, | |
714 | }; | |
715 | ||
221dee28 | 716 | static struct cpufreq_driver powernow_driver = { |
1da177e4 LT |
717 | .verify = powernow_verify, |
718 | .target = powernow_target, | |
719 | .get = powernow_get, | |
720 | .init = powernow_cpu_init, | |
721 | .exit = powernow_cpu_exit, | |
722 | .name = "powernow-k7", | |
723 | .owner = THIS_MODULE, | |
724 | .attr = powernow_table_attr, | |
725 | }; | |
726 | ||
b9e7638a | 727 | static int __init powernow_init(void) |
1da177e4 | 728 | { |
b9e7638a | 729 | if (check_powernow() == 0) |
1da177e4 LT |
730 | return -ENODEV; |
731 | return cpufreq_register_driver(&powernow_driver); | |
732 | } | |
733 | ||
734 | ||
b9e7638a | 735 | static void __exit powernow_exit(void) |
1da177e4 LT |
736 | { |
737 | cpufreq_unregister_driver(&powernow_driver); | |
738 | } | |
739 | ||
740 | module_param(acpi_force, int, 0444); | |
741 | MODULE_PARM_DESC(acpi_force, "Force ACPI to be used."); | |
742 | ||
b9e7638a DJ |
743 | MODULE_AUTHOR("Dave Jones <davej@redhat.com>"); |
744 | MODULE_DESCRIPTION("Powernow driver for AMD K7 processors."); | |
745 | MODULE_LICENSE("GPL"); | |
1da177e4 LT |
746 | |
747 | late_initcall(powernow_init); | |
748 | module_exit(powernow_exit); | |
749 |