Commit | Line | Data |
---|---|---|
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 | ||
b9e7638a DJ |
171 | static void invalidate_entry(unsigned int entry) |
172 | { | |
173 | powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID; | |
174 | } | |
1da177e4 | 175 | |
b9e7638a | 176 | static int get_ranges(unsigned char *pst) |
1da177e4 LT |
177 | { |
178 | unsigned int j; | |
179 | unsigned int speed; | |
180 | u8 fid, vid; | |
181 | ||
b9e7638a DJ |
182 | powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * |
183 | (number_scales + 1)), GFP_KERNEL); | |
1da177e4 LT |
184 | if (!powernow_table) |
185 | return -ENOMEM; | |
1da177e4 | 186 | |
b9e7638a | 187 | for (j = 0 ; j < number_scales; j++) { |
1da177e4 LT |
188 | fid = *pst++; |
189 | ||
190 | powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10; | |
191 | powernow_table[j].index = fid; /* lower 8 bits */ | |
192 | ||
193 | speed = powernow_table[j].frequency; | |
194 | ||
b9e7638a | 195 | if ((fid_codes[fid] % 10) == 5) { |
1da177e4 LT |
196 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
197 | if (have_a0 == 1) | |
b9e7638a | 198 | invalidate_entry(j); |
1da177e4 LT |
199 | #endif |
200 | } | |
201 | ||
202 | if (speed < minimum_speed) | |
203 | minimum_speed = speed; | |
204 | if (speed > maximum_speed) | |
205 | maximum_speed = speed; | |
206 | ||
207 | vid = *pst++; | |
208 | powernow_table[j].index |= (vid << 8); /* upper 8 bits */ | |
209 | ||
b9e7638a | 210 | dprintk(" FID: 0x%x (%d.%dx [%dMHz]) " |
32ee8c3e DJ |
211 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
212 | fid_codes[fid] % 10, speed/1000, vid, | |
1da177e4 LT |
213 | mobile_vid_table[vid]/1000, |
214 | mobile_vid_table[vid]%1000); | |
215 | } | |
216 | powernow_table[number_scales].frequency = CPUFREQ_TABLE_END; | |
217 | powernow_table[number_scales].index = 0; | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | ||
223 | static void change_FID(int fid) | |
224 | { | |
225 | union msr_fidvidctl fidvidctl; | |
226 | ||
b9e7638a | 227 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
228 | if (fidvidctl.bits.FID != fid) { |
229 | fidvidctl.bits.SGTC = latency; | |
230 | fidvidctl.bits.FID = fid; | |
231 | fidvidctl.bits.VIDC = 0; | |
232 | fidvidctl.bits.FIDC = 1; | |
b9e7638a | 233 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
234 | } |
235 | } | |
236 | ||
237 | ||
238 | static void change_VID(int vid) | |
239 | { | |
240 | union msr_fidvidctl fidvidctl; | |
241 | ||
b9e7638a | 242 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
243 | if (fidvidctl.bits.VID != vid) { |
244 | fidvidctl.bits.SGTC = latency; | |
245 | fidvidctl.bits.VID = vid; | |
246 | fidvidctl.bits.FIDC = 0; | |
247 | fidvidctl.bits.VIDC = 1; | |
b9e7638a | 248 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
249 | } |
250 | } | |
251 | ||
252 | ||
b9e7638a | 253 | static void change_speed(unsigned int index) |
1da177e4 LT |
254 | { |
255 | u8 fid, vid; | |
256 | struct cpufreq_freqs freqs; | |
257 | union msr_fidvidstatus fidvidstatus; | |
258 | int cfid; | |
259 | ||
260 | /* fid are the lower 8 bits of the index we stored into | |
261 | * the cpufreq frequency table in powernow_decode_bios, | |
262 | * vid are the upper 8 bits. | |
263 | */ | |
264 | ||
265 | fid = powernow_table[index].index & 0xFF; | |
266 | vid = (powernow_table[index].index & 0xFF00) >> 8; | |
267 | ||
268 | freqs.cpu = 0; | |
269 | ||
b9e7638a | 270 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 LT |
271 | cfid = fidvidstatus.bits.CFID; |
272 | freqs.old = fsb * fid_codes[cfid] / 10; | |
273 | ||
274 | freqs.new = powernow_table[index].frequency; | |
275 | ||
276 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
277 | ||
278 | /* Now do the magic poking into the MSRs. */ | |
279 | ||
280 | if (have_a0 == 1) /* A0 errata 5 */ | |
281 | local_irq_disable(); | |
282 | ||
283 | if (freqs.old > freqs.new) { | |
284 | /* Going down, so change FID first */ | |
285 | change_FID(fid); | |
286 | change_VID(vid); | |
287 | } else { | |
288 | /* Going up, so change VID first */ | |
289 | change_VID(vid); | |
290 | change_FID(fid); | |
291 | } | |
292 | ||
293 | ||
294 | if (have_a0 == 1) | |
295 | local_irq_enable(); | |
296 | ||
297 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
298 | } | |
299 | ||
300 | ||
301 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
302 | ||
303 | static struct acpi_processor_performance *acpi_processor_perf; | |
304 | ||
305 | static int powernow_acpi_init(void) | |
306 | { | |
307 | int i; | |
308 | int retval = 0; | |
309 | union powernow_acpi_control_t pc; | |
310 | ||
311 | if (acpi_processor_perf != NULL && powernow_table != NULL) { | |
312 | retval = -EINVAL; | |
313 | goto err0; | |
314 | } | |
315 | ||
bfdc708d | 316 | acpi_processor_perf = kzalloc(sizeof(struct acpi_processor_performance), |
1da177e4 | 317 | GFP_KERNEL); |
1da177e4 LT |
318 | if (!acpi_processor_perf) { |
319 | retval = -ENOMEM; | |
320 | goto err0; | |
321 | } | |
322 | ||
2fdf66b4 RR |
323 | if (!alloc_cpumask_var(&acpi_processor_perf->shared_cpu_map, |
324 | GFP_KERNEL)) { | |
325 | retval = -ENOMEM; | |
326 | goto err05; | |
327 | } | |
328 | ||
1da177e4 LT |
329 | if (acpi_processor_register_performance(acpi_processor_perf, 0)) { |
330 | retval = -EIO; | |
331 | goto err1; | |
332 | } | |
333 | ||
b9e7638a DJ |
334 | if (acpi_processor_perf->control_register.space_id != |
335 | ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
1da177e4 LT |
336 | retval = -ENODEV; |
337 | goto err2; | |
338 | } | |
339 | ||
b9e7638a DJ |
340 | if (acpi_processor_perf->status_register.space_id != |
341 | ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
1da177e4 LT |
342 | retval = -ENODEV; |
343 | goto err2; | |
344 | } | |
345 | ||
346 | number_scales = acpi_processor_perf->state_count; | |
347 | ||
348 | if (number_scales < 2) { | |
349 | retval = -ENODEV; | |
350 | goto err2; | |
351 | } | |
352 | ||
b9e7638a DJ |
353 | powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * |
354 | (number_scales + 1)), GFP_KERNEL); | |
1da177e4 LT |
355 | if (!powernow_table) { |
356 | retval = -ENOMEM; | |
357 | goto err2; | |
358 | } | |
359 | ||
1da177e4 LT |
360 | pc.val = (unsigned long) acpi_processor_perf->states[0].control; |
361 | for (i = 0; i < number_scales; i++) { | |
362 | u8 fid, vid; | |
dc2585eb DD |
363 | struct acpi_processor_px *state = |
364 | &acpi_processor_perf->states[i]; | |
365 | unsigned int speed, speed_mhz; | |
1da177e4 | 366 | |
dc2585eb | 367 | pc.val = (unsigned long) state->control; |
b9e7638a | 368 | dprintk("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n", |
1da177e4 | 369 | i, |
dc2585eb DD |
370 | (u32) state->core_frequency, |
371 | (u32) state->power, | |
372 | (u32) state->transition_latency, | |
373 | (u32) state->control, | |
1da177e4 LT |
374 | pc.bits.sgtc); |
375 | ||
376 | vid = pc.bits.vid; | |
377 | fid = pc.bits.fid; | |
378 | ||
379 | powernow_table[i].frequency = fsb * fid_codes[fid] / 10; | |
380 | powernow_table[i].index = fid; /* lower 8 bits */ | |
381 | powernow_table[i].index |= (vid << 8); /* upper 8 bits */ | |
382 | ||
383 | speed = powernow_table[i].frequency; | |
dc2585eb DD |
384 | speed_mhz = speed / 1000; |
385 | ||
386 | /* processor_perflib will multiply the MHz value by 1000 to | |
387 | * get a KHz value (e.g. 1266000). However, powernow-k7 works | |
388 | * with true KHz values (e.g. 1266768). To ensure that all | |
389 | * powernow frequencies are available, we must ensure that | |
390 | * ACPI doesn't restrict them, so we round up the MHz value | |
391 | * to ensure that perflib's computed KHz value is greater than | |
392 | * or equal to powernow's KHz value. | |
393 | */ | |
394 | if (speed % 1000 > 0) | |
395 | speed_mhz++; | |
1da177e4 | 396 | |
b9e7638a | 397 | if ((fid_codes[fid] % 10) == 5) { |
1da177e4 | 398 | if (have_a0 == 1) |
b9e7638a | 399 | invalidate_entry(i); |
1da177e4 LT |
400 | } |
401 | ||
b9e7638a | 402 | dprintk(" FID: 0x%x (%d.%dx [%dMHz]) " |
32ee8c3e | 403 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
dc2585eb | 404 | fid_codes[fid] % 10, speed_mhz, vid, |
1da177e4 LT |
405 | mobile_vid_table[vid]/1000, |
406 | mobile_vid_table[vid]%1000); | |
407 | ||
dc2585eb DD |
408 | if (state->core_frequency != speed_mhz) { |
409 | state->core_frequency = speed_mhz; | |
410 | dprintk(" Corrected ACPI frequency to %d\n", | |
411 | speed_mhz); | |
412 | } | |
413 | ||
1da177e4 LT |
414 | if (latency < pc.bits.sgtc) |
415 | latency = pc.bits.sgtc; | |
416 | ||
417 | if (speed < minimum_speed) | |
418 | minimum_speed = speed; | |
419 | if (speed > maximum_speed) | |
420 | maximum_speed = speed; | |
421 | } | |
422 | ||
423 | powernow_table[i].frequency = CPUFREQ_TABLE_END; | |
424 | powernow_table[i].index = 0; | |
425 | ||
426 | /* notify BIOS that we exist */ | |
427 | acpi_processor_notify_smm(THIS_MODULE); | |
428 | ||
429 | return 0; | |
430 | ||
431 | err2: | |
432 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
433 | err1: | |
2fdf66b4 RR |
434 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
435 | err05: | |
1da177e4 LT |
436 | kfree(acpi_processor_perf); |
437 | err0: | |
b9e7638a DJ |
438 | printk(KERN_WARNING PFX "ACPI perflib can not be used on " |
439 | "this platform\n"); | |
1da177e4 LT |
440 | acpi_processor_perf = NULL; |
441 | return retval; | |
442 | } | |
443 | #else | |
444 | static int powernow_acpi_init(void) | |
445 | { | |
446 | printk(KERN_INFO PFX "no support for ACPI processor found." | |
447 | " Please recompile your kernel with ACPI processor\n"); | |
448 | return -EINVAL; | |
449 | } | |
450 | #endif | |
451 | ||
b9e7638a DJ |
452 | static void print_pst_entry(struct pst_s *pst, unsigned int j) |
453 | { | |
454 | dprintk("PST:%d (@%p)\n", j, pst); | |
455 | dprintk(" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n", | |
456 | pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid); | |
457 | } | |
458 | ||
459 | static int powernow_decode_bios(int maxfid, int startvid) | |
1da177e4 LT |
460 | { |
461 | struct psb_s *psb; | |
462 | struct pst_s *pst; | |
463 | unsigned int i, j; | |
464 | unsigned char *p; | |
465 | unsigned int etuple; | |
466 | unsigned int ret; | |
467 | ||
468 | etuple = cpuid_eax(0x80000001); | |
469 | ||
b9e7638a | 470 | for (i = 0xC0000; i < 0xffff0 ; i += 16) { |
1da177e4 LT |
471 | |
472 | p = phys_to_virt(i); | |
473 | ||
b9e7638a DJ |
474 | if (memcmp(p, "AMDK7PNOW!", 10) == 0) { |
475 | dprintk("Found PSB header at %p\n", p); | |
1da177e4 | 476 | psb = (struct psb_s *) p; |
b9e7638a | 477 | dprintk("Table version: 0x%x\n", psb->tableversion); |
1da177e4 | 478 | if (psb->tableversion != 0x12) { |
b9e7638a DJ |
479 | printk(KERN_INFO PFX "Sorry, only v1.2 tables" |
480 | " supported right now\n"); | |
1da177e4 LT |
481 | return -ENODEV; |
482 | } | |
483 | ||
b9e7638a DJ |
484 | dprintk("Flags: 0x%x\n", psb->flags); |
485 | if ((psb->flags & 1) == 0) | |
486 | dprintk("Mobile voltage regulator\n"); | |
487 | else | |
488 | dprintk("Desktop voltage regulator\n"); | |
1da177e4 LT |
489 | |
490 | latency = psb->settlingtime; | |
491 | if (latency < 100) { | |
b9e7638a DJ |
492 | printk(KERN_INFO PFX "BIOS set settling time " |
493 | "to %d microseconds. " | |
494 | "Should be at least 100. " | |
495 | "Correcting.\n", latency); | |
1da177e4 LT |
496 | latency = 100; |
497 | } | |
b9e7638a DJ |
498 | dprintk("Settling Time: %d microseconds.\n", |
499 | psb->settlingtime); | |
500 | dprintk("Has %d PST tables. (Only dumping ones " | |
501 | "relevant to this CPU).\n", | |
502 | psb->numpst); | |
1da177e4 | 503 | |
b9e7638a | 504 | p += sizeof(struct psb_s); |
1da177e4 LT |
505 | |
506 | pst = (struct pst_s *) p; | |
507 | ||
b9e7638a | 508 | for (j = 0; j < psb->numpst; j++) { |
1da177e4 LT |
509 | pst = (struct pst_s *) p; |
510 | number_scales = pst->numpstates; | |
511 | ||
b9e7638a DJ |
512 | if ((etuple == pst->cpuid) && |
513 | check_fsb(pst->fsbspeed) && | |
514 | (maxfid == pst->maxfid) && | |
515 | (startvid == pst->startvid)) { | |
516 | print_pst_entry(pst, j); | |
517 | p = (char *)pst + sizeof(struct pst_s); | |
518 | ret = get_ranges(p); | |
1da177e4 | 519 | return ret; |
1da177e4 | 520 | } else { |
8cbe0169 | 521 | unsigned int k; |
b9e7638a DJ |
522 | p = (char *)pst + sizeof(struct pst_s); |
523 | for (k = 0; k < number_scales; k++) | |
524 | p += 2; | |
1da177e4 LT |
525 | } |
526 | } | |
b9e7638a DJ |
527 | printk(KERN_INFO PFX "No PST tables match this cpuid " |
528 | "(0x%x)\n", etuple); | |
529 | printk(KERN_INFO PFX "This is indicative of a broken " | |
530 | "BIOS.\n"); | |
1da177e4 LT |
531 | |
532 | return -EINVAL; | |
533 | } | |
534 | p++; | |
535 | } | |
536 | ||
537 | return -ENODEV; | |
538 | } | |
539 | ||
540 | ||
b9e7638a | 541 | static int powernow_target(struct cpufreq_policy *policy, |
1da177e4 LT |
542 | unsigned int target_freq, |
543 | unsigned int relation) | |
544 | { | |
545 | unsigned int newstate; | |
546 | ||
b9e7638a DJ |
547 | if (cpufreq_frequency_table_target(policy, powernow_table, target_freq, |
548 | relation, &newstate)) | |
1da177e4 LT |
549 | return -EINVAL; |
550 | ||
551 | change_speed(newstate); | |
552 | ||
553 | return 0; | |
554 | } | |
555 | ||
556 | ||
b9e7638a | 557 | static int powernow_verify(struct cpufreq_policy *policy) |
1da177e4 LT |
558 | { |
559 | return cpufreq_frequency_table_verify(policy, powernow_table); | |
560 | } | |
561 | ||
562 | /* | |
563 | * We use the fact that the bus frequency is somehow | |
564 | * a multiple of 100000/3 khz, then we compute sgtc according | |
565 | * to this multiple. | |
566 | * That way, we match more how AMD thinks all of that work. | |
567 | * We will then get the same kind of behaviour already tested under | |
568 | * the "well-known" other OS. | |
569 | */ | |
570 | static int __init fixup_sgtc(void) | |
571 | { | |
572 | unsigned int sgtc; | |
573 | unsigned int m; | |
574 | ||
575 | m = fsb / 3333; | |
576 | if ((m % 10) >= 5) | |
577 | m += 5; | |
578 | ||
579 | m /= 10; | |
580 | ||
581 | sgtc = 100 * m * latency; | |
582 | sgtc = sgtc / 3; | |
583 | if (sgtc > 0xfffff) { | |
584 | printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc); | |
585 | sgtc = 0xfffff; | |
586 | } | |
587 | return sgtc; | |
588 | } | |
589 | ||
590 | static unsigned int powernow_get(unsigned int cpu) | |
591 | { | |
592 | union msr_fidvidstatus fidvidstatus; | |
593 | unsigned int cfid; | |
594 | ||
595 | if (cpu) | |
596 | return 0; | |
b9e7638a | 597 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 LT |
598 | cfid = fidvidstatus.bits.CFID; |
599 | ||
b9e7638a | 600 | return fsb * fid_codes[cfid] / 10; |
1da177e4 LT |
601 | } |
602 | ||
603 | ||
0b4b5dde | 604 | static int __init acer_cpufreq_pst(const struct dmi_system_id *d) |
1da177e4 | 605 | { |
b9e7638a DJ |
606 | printk(KERN_WARNING PFX |
607 | "%s laptop with broken PST tables in BIOS detected.\n", | |
608 | d->ident); | |
609 | printk(KERN_WARNING PFX | |
610 | "You need to downgrade to 3A21 (09/09/2002), or try a newer " | |
611 | "BIOS than 3A71 (01/20/2003)\n"); | |
612 | printk(KERN_WARNING PFX | |
613 | "cpufreq scaling has been disabled as a result of this.\n"); | |
1da177e4 LT |
614 | return 0; |
615 | } | |
616 | ||
617 | /* | |
618 | * Some Athlon laptops have really fucked PST tables. | |
619 | * A BIOS update is all that can save them. | |
620 | * Mention this, and disable cpufreq. | |
621 | */ | |
622 | static struct dmi_system_id __initdata powernow_dmi_table[] = { | |
623 | { | |
624 | .callback = acer_cpufreq_pst, | |
625 | .ident = "Acer Aspire", | |
626 | .matches = { | |
627 | DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"), | |
628 | DMI_MATCH(DMI_BIOS_VERSION, "3A71"), | |
629 | }, | |
630 | }, | |
631 | { } | |
632 | }; | |
633 | ||
b9e7638a | 634 | static int __init powernow_cpu_init(struct cpufreq_policy *policy) |
1da177e4 LT |
635 | { |
636 | union msr_fidvidstatus fidvidstatus; | |
637 | int result; | |
638 | ||
639 | if (policy->cpu != 0) | |
640 | return -ENODEV; | |
641 | ||
b9e7638a | 642 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 | 643 | |
436fe7b8 | 644 | recalibrate_cpu_khz(); |
91350ed4 DJ |
645 | |
646 | fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID]; | |
1da177e4 LT |
647 | if (!fsb) { |
648 | printk(KERN_WARNING PFX "can not determine bus frequency\n"); | |
649 | return -EINVAL; | |
650 | } | |
7eb53d88 | 651 | dprintk("FSB: %3dMHz\n", fsb/1000); |
1da177e4 LT |
652 | |
653 | if (dmi_check_system(powernow_dmi_table) || acpi_force) { | |
b9e7638a DJ |
654 | printk(KERN_INFO PFX "PSB/PST known to be broken. " |
655 | "Trying ACPI instead\n"); | |
1da177e4 LT |
656 | result = powernow_acpi_init(); |
657 | } else { | |
b9e7638a DJ |
658 | result = powernow_decode_bios(fidvidstatus.bits.MFID, |
659 | fidvidstatus.bits.SVID); | |
1da177e4 | 660 | if (result) { |
b9e7638a | 661 | printk(KERN_INFO PFX "Trying ACPI perflib\n"); |
1da177e4 LT |
662 | maximum_speed = 0; |
663 | minimum_speed = -1; | |
664 | latency = 0; | |
665 | result = powernow_acpi_init(); | |
666 | if (result) { | |
b9e7638a DJ |
667 | printk(KERN_INFO PFX |
668 | "ACPI and legacy methods failed\n"); | |
1da177e4 LT |
669 | } |
670 | } else { | |
671 | /* SGTC use the bus clock as timer */ | |
672 | latency = fixup_sgtc(); | |
673 | printk(KERN_INFO PFX "SGTC: %d\n", latency); | |
674 | } | |
675 | } | |
676 | ||
677 | if (result) | |
678 | return result; | |
679 | ||
b9e7638a | 680 | printk(KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n", |
1da177e4 LT |
681 | minimum_speed/1000, maximum_speed/1000); |
682 | ||
b9e7638a DJ |
683 | policy->cpuinfo.transition_latency = |
684 | cpufreq_scale(2000000UL, fsb, latency); | |
1da177e4 LT |
685 | |
686 | policy->cur = powernow_get(0); | |
687 | ||
688 | cpufreq_frequency_table_get_attr(powernow_table, policy->cpu); | |
689 | ||
690 | return cpufreq_frequency_table_cpuinfo(policy, powernow_table); | |
691 | } | |
692 | ||
b9e7638a DJ |
693 | static int powernow_cpu_exit(struct cpufreq_policy *policy) |
694 | { | |
1da177e4 LT |
695 | cpufreq_frequency_table_put_attr(policy->cpu); |
696 | ||
697 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
698 | if (acpi_processor_perf) { | |
699 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
2fdf66b4 | 700 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
1da177e4 LT |
701 | kfree(acpi_processor_perf); |
702 | } | |
703 | #endif | |
704 | ||
4ae6673e | 705 | kfree(powernow_table); |
1da177e4 LT |
706 | return 0; |
707 | } | |
708 | ||
b9e7638a | 709 | static struct freq_attr *powernow_table_attr[] = { |
1da177e4 LT |
710 | &cpufreq_freq_attr_scaling_available_freqs, |
711 | NULL, | |
712 | }; | |
713 | ||
221dee28 | 714 | static struct cpufreq_driver powernow_driver = { |
1da177e4 LT |
715 | .verify = powernow_verify, |
716 | .target = powernow_target, | |
717 | .get = powernow_get, | |
718 | .init = powernow_cpu_init, | |
719 | .exit = powernow_cpu_exit, | |
720 | .name = "powernow-k7", | |
721 | .owner = THIS_MODULE, | |
722 | .attr = powernow_table_attr, | |
723 | }; | |
724 | ||
b9e7638a | 725 | static int __init powernow_init(void) |
1da177e4 | 726 | { |
b9e7638a | 727 | if (check_powernow() == 0) |
1da177e4 LT |
728 | return -ENODEV; |
729 | return cpufreq_register_driver(&powernow_driver); | |
730 | } | |
731 | ||
732 | ||
b9e7638a | 733 | static void __exit powernow_exit(void) |
1da177e4 LT |
734 | { |
735 | cpufreq_unregister_driver(&powernow_driver); | |
736 | } | |
737 | ||
738 | module_param(acpi_force, int, 0444); | |
739 | MODULE_PARM_DESC(acpi_force, "Force ACPI to be used."); | |
740 | ||
b9e7638a DJ |
741 | MODULE_AUTHOR("Dave Jones <davej@redhat.com>"); |
742 | MODULE_DESCRIPTION("Powernow driver for AMD K7 processors."); | |
743 | MODULE_LICENSE("GPL"); | |
1da177e4 LT |
744 | |
745 | late_initcall(powernow_init); | |
746 | module_exit(powernow_exit); | |
747 |