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 | ||
1da177e4 | 71 | /* divide by 1000 to get VCore voltage in V. */ |
bd5ab26a | 72 | static const int mobile_vid_table[32] = { |
1da177e4 LT |
73 | 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650, |
74 | 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0, | |
75 | 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100, | |
76 | 1075, 1050, 1025, 1000, 975, 950, 925, 0, | |
77 | }; | |
1da177e4 LT |
78 | |
79 | /* divide by 10 to get FID. */ | |
bd5ab26a | 80 | static const int fid_codes[32] = { |
1da177e4 LT |
81 | 110, 115, 120, 125, 50, 55, 60, 65, |
82 | 70, 75, 80, 85, 90, 95, 100, 105, | |
83 | 30, 190, 40, 200, 130, 135, 140, 210, | |
84 | 150, 225, 160, 165, 170, 180, -1, -1, | |
85 | }; | |
86 | ||
87 | /* This parameter is used in order to force ACPI instead of legacy method for | |
88 | * configuration purpose. | |
89 | */ | |
90 | ||
91 | static int acpi_force; | |
92 | ||
93 | static struct cpufreq_frequency_table *powernow_table; | |
94 | ||
95 | static unsigned int can_scale_bus; | |
96 | static unsigned int can_scale_vid; | |
fff78ad5 | 97 | static unsigned int minimum_speed = -1; |
1da177e4 LT |
98 | static unsigned int maximum_speed; |
99 | static unsigned int number_scales; | |
100 | static unsigned int fsb; | |
101 | static unsigned int latency; | |
102 | static char have_a0; | |
103 | ||
1da177e4 LT |
104 | static int check_fsb(unsigned int fsbspeed) |
105 | { | |
106 | int delta; | |
107 | unsigned int f = fsb / 1000; | |
108 | ||
109 | delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed; | |
b9e7638a | 110 | return delta < 5; |
1da177e4 LT |
111 | } |
112 | ||
113 | static int check_powernow(void) | |
114 | { | |
92cb7612 | 115 | struct cpuinfo_x86 *c = &cpu_data(0); |
1da177e4 LT |
116 | unsigned int maxei, eax, ebx, ecx, edx; |
117 | ||
b9e7638a | 118 | if ((c->x86_vendor != X86_VENDOR_AMD) || (c->x86 != 6)) { |
1da177e4 | 119 | #ifdef MODULE |
b9e7638a DJ |
120 | printk(KERN_INFO PFX "This module only works with " |
121 | "AMD K7 CPUs\n"); | |
1da177e4 LT |
122 | #endif |
123 | return 0; | |
124 | } | |
125 | ||
126 | /* Get maximum capabilities */ | |
b9e7638a | 127 | maxei = cpuid_eax(0x80000000); |
1da177e4 LT |
128 | if (maxei < 0x80000007) { /* Any powernow info ? */ |
129 | #ifdef MODULE | |
b9e7638a | 130 | printk(KERN_INFO PFX "No powernow capabilities detected\n"); |
1da177e4 LT |
131 | #endif |
132 | return 0; | |
133 | } | |
134 | ||
135 | if ((c->x86_model == 6) && (c->x86_mask == 0)) { | |
b9e7638a DJ |
136 | printk(KERN_INFO PFX "K7 660[A0] core detected, " |
137 | "enabling errata workarounds\n"); | |
1da177e4 LT |
138 | have_a0 = 1; |
139 | } | |
140 | ||
141 | cpuid(0x80000007, &eax, &ebx, &ecx, &edx); | |
142 | ||
143 | /* Check we can actually do something before we say anything.*/ | |
144 | if (!(edx & (1 << 1 | 1 << 2))) | |
145 | return 0; | |
146 | ||
b9e7638a | 147 | printk(KERN_INFO PFX "PowerNOW! Technology present. Can scale: "); |
1da177e4 LT |
148 | |
149 | if (edx & 1 << 1) { | |
b9e7638a DJ |
150 | printk("frequency"); |
151 | can_scale_bus = 1; | |
1da177e4 LT |
152 | } |
153 | ||
154 | if ((edx & (1 << 1 | 1 << 2)) == 0x6) | |
b9e7638a | 155 | printk(" and "); |
1da177e4 LT |
156 | |
157 | if (edx & 1 << 2) { | |
b9e7638a DJ |
158 | printk("voltage"); |
159 | can_scale_vid = 1; | |
1da177e4 LT |
160 | } |
161 | ||
b9e7638a | 162 | printk(".\n"); |
1da177e4 LT |
163 | return 1; |
164 | } | |
165 | ||
d38e73e8 | 166 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
b9e7638a DJ |
167 | static void invalidate_entry(unsigned int entry) |
168 | { | |
169 | powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID; | |
170 | } | |
d38e73e8 | 171 | #endif |
1da177e4 | 172 | |
b9e7638a | 173 | static int get_ranges(unsigned char *pst) |
1da177e4 LT |
174 | { |
175 | unsigned int j; | |
176 | unsigned int speed; | |
177 | u8 fid, vid; | |
178 | ||
b9e7638a DJ |
179 | powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * |
180 | (number_scales + 1)), GFP_KERNEL); | |
1da177e4 LT |
181 | if (!powernow_table) |
182 | return -ENOMEM; | |
1da177e4 | 183 | |
b9e7638a | 184 | for (j = 0 ; j < number_scales; j++) { |
1da177e4 LT |
185 | fid = *pst++; |
186 | ||
187 | powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10; | |
188 | powernow_table[j].index = fid; /* lower 8 bits */ | |
189 | ||
190 | speed = powernow_table[j].frequency; | |
191 | ||
b9e7638a | 192 | if ((fid_codes[fid] % 10) == 5) { |
1da177e4 LT |
193 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
194 | if (have_a0 == 1) | |
b9e7638a | 195 | invalidate_entry(j); |
1da177e4 LT |
196 | #endif |
197 | } | |
198 | ||
199 | if (speed < minimum_speed) | |
200 | minimum_speed = speed; | |
201 | if (speed > maximum_speed) | |
202 | maximum_speed = speed; | |
203 | ||
204 | vid = *pst++; | |
205 | powernow_table[j].index |= (vid << 8); /* upper 8 bits */ | |
206 | ||
2d06d8c4 | 207 | pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) " |
32ee8c3e DJ |
208 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
209 | fid_codes[fid] % 10, speed/1000, vid, | |
1da177e4 LT |
210 | mobile_vid_table[vid]/1000, |
211 | mobile_vid_table[vid]%1000); | |
212 | } | |
213 | powernow_table[number_scales].frequency = CPUFREQ_TABLE_END; | |
214 | powernow_table[number_scales].index = 0; | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | ||
220 | static void change_FID(int fid) | |
221 | { | |
222 | union msr_fidvidctl fidvidctl; | |
223 | ||
b9e7638a | 224 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
225 | if (fidvidctl.bits.FID != fid) { |
226 | fidvidctl.bits.SGTC = latency; | |
227 | fidvidctl.bits.FID = fid; | |
228 | fidvidctl.bits.VIDC = 0; | |
229 | fidvidctl.bits.FIDC = 1; | |
b9e7638a | 230 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
231 | } |
232 | } | |
233 | ||
234 | ||
235 | static void change_VID(int vid) | |
236 | { | |
237 | union msr_fidvidctl fidvidctl; | |
238 | ||
b9e7638a | 239 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
240 | if (fidvidctl.bits.VID != vid) { |
241 | fidvidctl.bits.SGTC = latency; | |
242 | fidvidctl.bits.VID = vid; | |
243 | fidvidctl.bits.FIDC = 0; | |
244 | fidvidctl.bits.VIDC = 1; | |
b9e7638a | 245 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
246 | } |
247 | } | |
248 | ||
249 | ||
b9e7638a | 250 | static void change_speed(unsigned int index) |
1da177e4 LT |
251 | { |
252 | u8 fid, vid; | |
253 | struct cpufreq_freqs freqs; | |
254 | union msr_fidvidstatus fidvidstatus; | |
255 | int cfid; | |
256 | ||
257 | /* fid are the lower 8 bits of the index we stored into | |
258 | * the cpufreq frequency table in powernow_decode_bios, | |
259 | * vid are the upper 8 bits. | |
260 | */ | |
261 | ||
262 | fid = powernow_table[index].index & 0xFF; | |
263 | vid = (powernow_table[index].index & 0xFF00) >> 8; | |
264 | ||
265 | freqs.cpu = 0; | |
266 | ||
b9e7638a | 267 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 LT |
268 | cfid = fidvidstatus.bits.CFID; |
269 | freqs.old = fsb * fid_codes[cfid] / 10; | |
270 | ||
271 | freqs.new = powernow_table[index].frequency; | |
272 | ||
273 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
274 | ||
275 | /* Now do the magic poking into the MSRs. */ | |
276 | ||
277 | if (have_a0 == 1) /* A0 errata 5 */ | |
278 | local_irq_disable(); | |
279 | ||
280 | if (freqs.old > freqs.new) { | |
281 | /* Going down, so change FID first */ | |
282 | change_FID(fid); | |
283 | change_VID(vid); | |
284 | } else { | |
285 | /* Going up, so change VID first */ | |
286 | change_VID(vid); | |
287 | change_FID(fid); | |
288 | } | |
289 | ||
290 | ||
291 | if (have_a0 == 1) | |
292 | local_irq_enable(); | |
293 | ||
294 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
295 | } | |
296 | ||
297 | ||
298 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
299 | ||
300 | static struct acpi_processor_performance *acpi_processor_perf; | |
301 | ||
302 | static int powernow_acpi_init(void) | |
303 | { | |
304 | int i; | |
305 | int retval = 0; | |
306 | union powernow_acpi_control_t pc; | |
307 | ||
308 | if (acpi_processor_perf != NULL && powernow_table != NULL) { | |
309 | retval = -EINVAL; | |
310 | goto err0; | |
311 | } | |
312 | ||
bfdc708d | 313 | acpi_processor_perf = kzalloc(sizeof(struct acpi_processor_performance), |
1da177e4 | 314 | GFP_KERNEL); |
1da177e4 LT |
315 | if (!acpi_processor_perf) { |
316 | retval = -ENOMEM; | |
317 | goto err0; | |
318 | } | |
319 | ||
eaa95840 | 320 | if (!zalloc_cpumask_var(&acpi_processor_perf->shared_cpu_map, |
2fdf66b4 RR |
321 | GFP_KERNEL)) { |
322 | retval = -ENOMEM; | |
323 | goto err05; | |
324 | } | |
325 | ||
1da177e4 LT |
326 | if (acpi_processor_register_performance(acpi_processor_perf, 0)) { |
327 | retval = -EIO; | |
328 | goto err1; | |
329 | } | |
330 | ||
b9e7638a DJ |
331 | if (acpi_processor_perf->control_register.space_id != |
332 | ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
1da177e4 LT |
333 | retval = -ENODEV; |
334 | goto err2; | |
335 | } | |
336 | ||
b9e7638a DJ |
337 | if (acpi_processor_perf->status_register.space_id != |
338 | ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
1da177e4 LT |
339 | retval = -ENODEV; |
340 | goto err2; | |
341 | } | |
342 | ||
343 | number_scales = acpi_processor_perf->state_count; | |
344 | ||
345 | if (number_scales < 2) { | |
346 | retval = -ENODEV; | |
347 | goto err2; | |
348 | } | |
349 | ||
b9e7638a DJ |
350 | powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * |
351 | (number_scales + 1)), GFP_KERNEL); | |
1da177e4 LT |
352 | if (!powernow_table) { |
353 | retval = -ENOMEM; | |
354 | goto err2; | |
355 | } | |
356 | ||
1da177e4 LT |
357 | pc.val = (unsigned long) acpi_processor_perf->states[0].control; |
358 | for (i = 0; i < number_scales; i++) { | |
359 | u8 fid, vid; | |
dc2585eb DD |
360 | struct acpi_processor_px *state = |
361 | &acpi_processor_perf->states[i]; | |
362 | unsigned int speed, speed_mhz; | |
1da177e4 | 363 | |
dc2585eb | 364 | pc.val = (unsigned long) state->control; |
2d06d8c4 | 365 | pr_debug("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n", |
1da177e4 | 366 | i, |
dc2585eb DD |
367 | (u32) state->core_frequency, |
368 | (u32) state->power, | |
369 | (u32) state->transition_latency, | |
370 | (u32) state->control, | |
1da177e4 LT |
371 | pc.bits.sgtc); |
372 | ||
373 | vid = pc.bits.vid; | |
374 | fid = pc.bits.fid; | |
375 | ||
376 | powernow_table[i].frequency = fsb * fid_codes[fid] / 10; | |
377 | powernow_table[i].index = fid; /* lower 8 bits */ | |
378 | powernow_table[i].index |= (vid << 8); /* upper 8 bits */ | |
379 | ||
380 | speed = powernow_table[i].frequency; | |
dc2585eb DD |
381 | speed_mhz = speed / 1000; |
382 | ||
383 | /* processor_perflib will multiply the MHz value by 1000 to | |
384 | * get a KHz value (e.g. 1266000). However, powernow-k7 works | |
385 | * with true KHz values (e.g. 1266768). To ensure that all | |
386 | * powernow frequencies are available, we must ensure that | |
387 | * ACPI doesn't restrict them, so we round up the MHz value | |
388 | * to ensure that perflib's computed KHz value is greater than | |
389 | * or equal to powernow's KHz value. | |
390 | */ | |
391 | if (speed % 1000 > 0) | |
392 | speed_mhz++; | |
1da177e4 | 393 | |
b9e7638a | 394 | if ((fid_codes[fid] % 10) == 5) { |
1da177e4 | 395 | if (have_a0 == 1) |
b9e7638a | 396 | invalidate_entry(i); |
1da177e4 LT |
397 | } |
398 | ||
2d06d8c4 | 399 | pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) " |
32ee8c3e | 400 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
dc2585eb | 401 | fid_codes[fid] % 10, speed_mhz, vid, |
1da177e4 LT |
402 | mobile_vid_table[vid]/1000, |
403 | mobile_vid_table[vid]%1000); | |
404 | ||
dc2585eb DD |
405 | if (state->core_frequency != speed_mhz) { |
406 | state->core_frequency = speed_mhz; | |
2d06d8c4 | 407 | pr_debug(" Corrected ACPI frequency to %d\n", |
dc2585eb DD |
408 | speed_mhz); |
409 | } | |
410 | ||
1da177e4 LT |
411 | if (latency < pc.bits.sgtc) |
412 | latency = pc.bits.sgtc; | |
413 | ||
414 | if (speed < minimum_speed) | |
415 | minimum_speed = speed; | |
416 | if (speed > maximum_speed) | |
417 | maximum_speed = speed; | |
418 | } | |
419 | ||
420 | powernow_table[i].frequency = CPUFREQ_TABLE_END; | |
421 | powernow_table[i].index = 0; | |
422 | ||
423 | /* notify BIOS that we exist */ | |
424 | acpi_processor_notify_smm(THIS_MODULE); | |
425 | ||
426 | return 0; | |
427 | ||
428 | err2: | |
429 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
430 | err1: | |
2fdf66b4 RR |
431 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
432 | err05: | |
1da177e4 LT |
433 | kfree(acpi_processor_perf); |
434 | err0: | |
b9e7638a DJ |
435 | printk(KERN_WARNING PFX "ACPI perflib can not be used on " |
436 | "this platform\n"); | |
1da177e4 LT |
437 | acpi_processor_perf = NULL; |
438 | return retval; | |
439 | } | |
440 | #else | |
441 | static int powernow_acpi_init(void) | |
442 | { | |
443 | printk(KERN_INFO PFX "no support for ACPI processor found." | |
444 | " Please recompile your kernel with ACPI processor\n"); | |
445 | return -EINVAL; | |
446 | } | |
447 | #endif | |
448 | ||
b9e7638a DJ |
449 | static void print_pst_entry(struct pst_s *pst, unsigned int j) |
450 | { | |
2d06d8c4 DB |
451 | pr_debug("PST:%d (@%p)\n", j, pst); |
452 | pr_debug(" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n", | |
b9e7638a DJ |
453 | pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid); |
454 | } | |
455 | ||
456 | static int powernow_decode_bios(int maxfid, int startvid) | |
1da177e4 LT |
457 | { |
458 | struct psb_s *psb; | |
459 | struct pst_s *pst; | |
460 | unsigned int i, j; | |
461 | unsigned char *p; | |
462 | unsigned int etuple; | |
463 | unsigned int ret; | |
464 | ||
465 | etuple = cpuid_eax(0x80000001); | |
466 | ||
b9e7638a | 467 | for (i = 0xC0000; i < 0xffff0 ; i += 16) { |
1da177e4 LT |
468 | |
469 | p = phys_to_virt(i); | |
470 | ||
b9e7638a | 471 | if (memcmp(p, "AMDK7PNOW!", 10) == 0) { |
2d06d8c4 | 472 | pr_debug("Found PSB header at %p\n", p); |
1da177e4 | 473 | psb = (struct psb_s *) p; |
2d06d8c4 | 474 | pr_debug("Table version: 0x%x\n", psb->tableversion); |
1da177e4 | 475 | if (psb->tableversion != 0x12) { |
b9e7638a DJ |
476 | printk(KERN_INFO PFX "Sorry, only v1.2 tables" |
477 | " supported right now\n"); | |
1da177e4 LT |
478 | return -ENODEV; |
479 | } | |
480 | ||
2d06d8c4 | 481 | pr_debug("Flags: 0x%x\n", psb->flags); |
b9e7638a | 482 | if ((psb->flags & 1) == 0) |
2d06d8c4 | 483 | pr_debug("Mobile voltage regulator\n"); |
b9e7638a | 484 | else |
2d06d8c4 | 485 | pr_debug("Desktop voltage regulator\n"); |
1da177e4 LT |
486 | |
487 | latency = psb->settlingtime; | |
488 | if (latency < 100) { | |
b9e7638a DJ |
489 | printk(KERN_INFO PFX "BIOS set settling time " |
490 | "to %d microseconds. " | |
491 | "Should be at least 100. " | |
492 | "Correcting.\n", latency); | |
1da177e4 LT |
493 | latency = 100; |
494 | } | |
2d06d8c4 | 495 | pr_debug("Settling Time: %d microseconds.\n", |
b9e7638a | 496 | psb->settlingtime); |
2d06d8c4 | 497 | pr_debug("Has %d PST tables. (Only dumping ones " |
b9e7638a DJ |
498 | "relevant to this CPU).\n", |
499 | psb->numpst); | |
1da177e4 | 500 | |
b9e7638a | 501 | p += sizeof(struct psb_s); |
1da177e4 LT |
502 | |
503 | pst = (struct pst_s *) p; | |
504 | ||
b9e7638a | 505 | for (j = 0; j < psb->numpst; j++) { |
1da177e4 LT |
506 | pst = (struct pst_s *) p; |
507 | number_scales = pst->numpstates; | |
508 | ||
b9e7638a DJ |
509 | if ((etuple == pst->cpuid) && |
510 | check_fsb(pst->fsbspeed) && | |
511 | (maxfid == pst->maxfid) && | |
512 | (startvid == pst->startvid)) { | |
513 | print_pst_entry(pst, j); | |
514 | p = (char *)pst + sizeof(struct pst_s); | |
515 | ret = get_ranges(p); | |
1da177e4 | 516 | return ret; |
1da177e4 | 517 | } else { |
8cbe0169 | 518 | unsigned int k; |
b9e7638a DJ |
519 | p = (char *)pst + sizeof(struct pst_s); |
520 | for (k = 0; k < number_scales; k++) | |
521 | p += 2; | |
1da177e4 LT |
522 | } |
523 | } | |
b9e7638a DJ |
524 | printk(KERN_INFO PFX "No PST tables match this cpuid " |
525 | "(0x%x)\n", etuple); | |
526 | printk(KERN_INFO PFX "This is indicative of a broken " | |
527 | "BIOS.\n"); | |
1da177e4 LT |
528 | |
529 | return -EINVAL; | |
530 | } | |
531 | p++; | |
532 | } | |
533 | ||
534 | return -ENODEV; | |
535 | } | |
536 | ||
537 | ||
b9e7638a | 538 | static int powernow_target(struct cpufreq_policy *policy, |
1da177e4 LT |
539 | unsigned int target_freq, |
540 | unsigned int relation) | |
541 | { | |
542 | unsigned int newstate; | |
543 | ||
b9e7638a DJ |
544 | if (cpufreq_frequency_table_target(policy, powernow_table, target_freq, |
545 | relation, &newstate)) | |
1da177e4 LT |
546 | return -EINVAL; |
547 | ||
548 | change_speed(newstate); | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
553 | ||
b9e7638a | 554 | static int powernow_verify(struct cpufreq_policy *policy) |
1da177e4 LT |
555 | { |
556 | return cpufreq_frequency_table_verify(policy, powernow_table); | |
557 | } | |
558 | ||
559 | /* | |
560 | * We use the fact that the bus frequency is somehow | |
561 | * a multiple of 100000/3 khz, then we compute sgtc according | |
562 | * to this multiple. | |
563 | * That way, we match more how AMD thinks all of that work. | |
564 | * We will then get the same kind of behaviour already tested under | |
565 | * the "well-known" other OS. | |
566 | */ | |
307069cf | 567 | static int __cpuinit fixup_sgtc(void) |
1da177e4 LT |
568 | { |
569 | unsigned int sgtc; | |
570 | unsigned int m; | |
571 | ||
572 | m = fsb / 3333; | |
573 | if ((m % 10) >= 5) | |
574 | m += 5; | |
575 | ||
576 | m /= 10; | |
577 | ||
578 | sgtc = 100 * m * latency; | |
579 | sgtc = sgtc / 3; | |
580 | if (sgtc > 0xfffff) { | |
581 | printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc); | |
582 | sgtc = 0xfffff; | |
583 | } | |
584 | return sgtc; | |
585 | } | |
586 | ||
587 | static unsigned int powernow_get(unsigned int cpu) | |
588 | { | |
589 | union msr_fidvidstatus fidvidstatus; | |
590 | unsigned int cfid; | |
591 | ||
592 | if (cpu) | |
593 | return 0; | |
b9e7638a | 594 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 LT |
595 | cfid = fidvidstatus.bits.CFID; |
596 | ||
b9e7638a | 597 | return fsb * fid_codes[cfid] / 10; |
1da177e4 LT |
598 | } |
599 | ||
600 | ||
307069cf | 601 | static int __cpuinit acer_cpufreq_pst(const struct dmi_system_id *d) |
1da177e4 | 602 | { |
b9e7638a DJ |
603 | printk(KERN_WARNING PFX |
604 | "%s laptop with broken PST tables in BIOS detected.\n", | |
605 | d->ident); | |
606 | printk(KERN_WARNING PFX | |
607 | "You need to downgrade to 3A21 (09/09/2002), or try a newer " | |
608 | "BIOS than 3A71 (01/20/2003)\n"); | |
609 | printk(KERN_WARNING PFX | |
610 | "cpufreq scaling has been disabled as a result of this.\n"); | |
1da177e4 LT |
611 | return 0; |
612 | } | |
613 | ||
614 | /* | |
615 | * Some Athlon laptops have really fucked PST tables. | |
616 | * A BIOS update is all that can save them. | |
617 | * Mention this, and disable cpufreq. | |
618 | */ | |
307069cf | 619 | static struct dmi_system_id __cpuinitdata powernow_dmi_table[] = { |
1da177e4 LT |
620 | { |
621 | .callback = acer_cpufreq_pst, | |
622 | .ident = "Acer Aspire", | |
623 | .matches = { | |
624 | DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"), | |
625 | DMI_MATCH(DMI_BIOS_VERSION, "3A71"), | |
626 | }, | |
627 | }, | |
628 | { } | |
629 | }; | |
630 | ||
307069cf | 631 | static int __cpuinit powernow_cpu_init(struct cpufreq_policy *policy) |
1da177e4 LT |
632 | { |
633 | union msr_fidvidstatus fidvidstatus; | |
634 | int result; | |
635 | ||
636 | if (policy->cpu != 0) | |
637 | return -ENODEV; | |
638 | ||
b9e7638a | 639 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 | 640 | |
436fe7b8 | 641 | recalibrate_cpu_khz(); |
91350ed4 DJ |
642 | |
643 | fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID]; | |
1da177e4 LT |
644 | if (!fsb) { |
645 | printk(KERN_WARNING PFX "can not determine bus frequency\n"); | |
646 | return -EINVAL; | |
647 | } | |
2d06d8c4 | 648 | pr_debug("FSB: %3dMHz\n", fsb/1000); |
1da177e4 LT |
649 | |
650 | if (dmi_check_system(powernow_dmi_table) || acpi_force) { | |
b9e7638a DJ |
651 | printk(KERN_INFO PFX "PSB/PST known to be broken. " |
652 | "Trying ACPI instead\n"); | |
1da177e4 LT |
653 | result = powernow_acpi_init(); |
654 | } else { | |
b9e7638a DJ |
655 | result = powernow_decode_bios(fidvidstatus.bits.MFID, |
656 | fidvidstatus.bits.SVID); | |
1da177e4 | 657 | if (result) { |
b9e7638a | 658 | printk(KERN_INFO PFX "Trying ACPI perflib\n"); |
1da177e4 LT |
659 | maximum_speed = 0; |
660 | minimum_speed = -1; | |
661 | latency = 0; | |
662 | result = powernow_acpi_init(); | |
663 | if (result) { | |
b9e7638a DJ |
664 | printk(KERN_INFO PFX |
665 | "ACPI and legacy methods failed\n"); | |
1da177e4 LT |
666 | } |
667 | } else { | |
668 | /* SGTC use the bus clock as timer */ | |
669 | latency = fixup_sgtc(); | |
670 | printk(KERN_INFO PFX "SGTC: %d\n", latency); | |
671 | } | |
672 | } | |
673 | ||
674 | if (result) | |
675 | return result; | |
676 | ||
b9e7638a | 677 | printk(KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n", |
1da177e4 LT |
678 | minimum_speed/1000, maximum_speed/1000); |
679 | ||
b9e7638a DJ |
680 | policy->cpuinfo.transition_latency = |
681 | cpufreq_scale(2000000UL, fsb, latency); | |
1da177e4 LT |
682 | |
683 | policy->cur = powernow_get(0); | |
684 | ||
685 | cpufreq_frequency_table_get_attr(powernow_table, policy->cpu); | |
686 | ||
687 | return cpufreq_frequency_table_cpuinfo(policy, powernow_table); | |
688 | } | |
689 | ||
b9e7638a DJ |
690 | static int powernow_cpu_exit(struct cpufreq_policy *policy) |
691 | { | |
1da177e4 LT |
692 | cpufreq_frequency_table_put_attr(policy->cpu); |
693 | ||
694 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
695 | if (acpi_processor_perf) { | |
696 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
2fdf66b4 | 697 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
1da177e4 LT |
698 | kfree(acpi_processor_perf); |
699 | } | |
700 | #endif | |
701 | ||
4ae6673e | 702 | kfree(powernow_table); |
1da177e4 LT |
703 | return 0; |
704 | } | |
705 | ||
b9e7638a | 706 | static struct freq_attr *powernow_table_attr[] = { |
1da177e4 LT |
707 | &cpufreq_freq_attr_scaling_available_freqs, |
708 | NULL, | |
709 | }; | |
710 | ||
221dee28 | 711 | static struct cpufreq_driver powernow_driver = { |
e2f74f35 TR |
712 | .verify = powernow_verify, |
713 | .target = powernow_target, | |
714 | .get = powernow_get, | |
715 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
716 | .bios_limit = acpi_processor_get_bios_limit, | |
717 | #endif | |
718 | .init = powernow_cpu_init, | |
719 | .exit = powernow_cpu_exit, | |
720 | .name = "powernow-k7", | |
721 | .owner = THIS_MODULE, | |
722 | .attr = powernow_table_attr, | |
1da177e4 LT |
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 |