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 | * |
5 | * Licensed under the terms of the GNU GPL License version 2. | |
6 | * Based upon datasheets & sample CPUs kindly provided by AMD. | |
7 | * | |
b9e7638a DJ |
8 | * Errata 5: |
9 | * CPU may fail to execute a FID/VID change in presence of interrupt. | |
10 | * - We cli/sti on stepping A0 CPUs around the FID/VID transition. | |
11 | * Errata 15: | |
12 | * CPU with half frequency multipliers may hang upon wakeup from disconnect. | |
13 | * - We disable half multipliers if ACPI is used on A0 stepping CPUs. | |
1da177e4 LT |
14 | */ |
15 | ||
1da177e4 LT |
16 | #include <linux/kernel.h> |
17 | #include <linux/module.h> | |
18 | #include <linux/moduleparam.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/cpufreq.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/dmi.h> | |
b9e7638a DJ |
24 | #include <linux/timex.h> |
25 | #include <linux/io.h> | |
1da177e4 | 26 | |
b9e7638a | 27 | #include <asm/timer.h> /* Needed for recalibrate_cpu_khz() */ |
1da177e4 | 28 | #include <asm/msr.h> |
fa8031ae | 29 | #include <asm/cpu_device_id.h> |
1da177e4 LT |
30 | |
31 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
32 | #include <linux/acpi.h> | |
33 | #include <acpi/processor.h> | |
34 | #endif | |
35 | ||
36 | #include "powernow-k7.h" | |
37 | ||
38 | #define PFX "powernow: " | |
39 | ||
40 | ||
41 | struct psb_s { | |
42 | u8 signature[10]; | |
43 | u8 tableversion; | |
44 | u8 flags; | |
45 | u16 settlingtime; | |
46 | u8 reserved1; | |
47 | u8 numpst; | |
48 | }; | |
49 | ||
50 | struct pst_s { | |
51 | u32 cpuid; | |
52 | u8 fsbspeed; | |
53 | u8 maxfid; | |
54 | u8 startvid; | |
55 | u8 numpstates; | |
56 | }; | |
57 | ||
58 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
59 | union powernow_acpi_control_t { | |
60 | struct { | |
61 | unsigned long fid:5, | |
b9e7638a DJ |
62 | vid:5, |
63 | sgtc:20, | |
64 | res1:2; | |
1da177e4 LT |
65 | } bits; |
66 | unsigned long val; | |
67 | }; | |
68 | #endif | |
69 | ||
1da177e4 | 70 | /* divide by 1000 to get VCore voltage in V. */ |
bd5ab26a | 71 | static const int mobile_vid_table[32] = { |
1da177e4 LT |
72 | 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650, |
73 | 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0, | |
74 | 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100, | |
75 | 1075, 1050, 1025, 1000, 975, 950, 925, 0, | |
76 | }; | |
1da177e4 LT |
77 | |
78 | /* divide by 10 to get FID. */ | |
bd5ab26a | 79 | static const int fid_codes[32] = { |
1da177e4 LT |
80 | 110, 115, 120, 125, 50, 55, 60, 65, |
81 | 70, 75, 80, 85, 90, 95, 100, 105, | |
82 | 30, 190, 40, 200, 130, 135, 140, 210, | |
83 | 150, 225, 160, 165, 170, 180, -1, -1, | |
84 | }; | |
85 | ||
86 | /* This parameter is used in order to force ACPI instead of legacy method for | |
87 | * configuration purpose. | |
88 | */ | |
89 | ||
90 | static int acpi_force; | |
91 | ||
92 | static struct cpufreq_frequency_table *powernow_table; | |
93 | ||
94 | static unsigned int can_scale_bus; | |
95 | static unsigned int can_scale_vid; | |
fff78ad5 | 96 | static unsigned int minimum_speed = -1; |
1da177e4 LT |
97 | static unsigned int maximum_speed; |
98 | static unsigned int number_scales; | |
99 | static unsigned int fsb; | |
100 | static unsigned int latency; | |
101 | static char have_a0; | |
102 | ||
1da177e4 LT |
103 | static int check_fsb(unsigned int fsbspeed) |
104 | { | |
105 | int delta; | |
106 | unsigned int f = fsb / 1000; | |
107 | ||
108 | delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed; | |
b9e7638a | 109 | return delta < 5; |
1da177e4 LT |
110 | } |
111 | ||
fa8031ae | 112 | static const struct x86_cpu_id powernow_k7_cpuids[] = { |
30bcfff9 | 113 | { X86_VENDOR_AMD, 6, }, |
fa8031ae AK |
114 | {} |
115 | }; | |
116 | MODULE_DEVICE_TABLE(x86cpu, powernow_k7_cpuids); | |
117 | ||
1da177e4 LT |
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 | ||
fa8031ae | 123 | if (!x86_match_cpu(powernow_k7_cpuids)) |
1da177e4 | 124 | return 0; |
1da177e4 LT |
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 | ||
d5b73cd8 | 179 | powernow_table = kzalloc((sizeof(*powernow_table) * |
b9e7638a | 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; | |
50701588 | 188 | powernow_table[j].driver_data = fid; /* lower 8 bits */ |
1da177e4 LT |
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++; | |
50701588 | 205 | powernow_table[j].driver_data |= (vid << 8); /* upper 8 bits */ |
1da177e4 | 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; | |
50701588 | 214 | powernow_table[number_scales].driver_data = 0; |
1da177e4 LT |
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 | ||
9c0ebcf7 | 250 | static int powernow_target(struct cpufreq_policy *policy, 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 | ||
50701588 VK |
262 | fid = powernow_table[index].driver_data & 0xFF; |
263 | vid = (powernow_table[index].driver_data & 0xFF00) >> 8; | |
1da177e4 | 264 | |
b9e7638a | 265 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 LT |
266 | cfid = fidvidstatus.bits.CFID; |
267 | freqs.old = fsb * fid_codes[cfid] / 10; | |
268 | ||
269 | freqs.new = powernow_table[index].frequency; | |
270 | ||
1da177e4 LT |
271 | /* Now do the magic poking into the MSRs. */ |
272 | ||
273 | if (have_a0 == 1) /* A0 errata 5 */ | |
274 | local_irq_disable(); | |
275 | ||
276 | if (freqs.old > freqs.new) { | |
277 | /* Going down, so change FID first */ | |
278 | change_FID(fid); | |
279 | change_VID(vid); | |
280 | } else { | |
281 | /* Going up, so change VID first */ | |
282 | change_VID(vid); | |
283 | change_FID(fid); | |
284 | } | |
285 | ||
286 | ||
287 | if (have_a0 == 1) | |
288 | local_irq_enable(); | |
289 | ||
9c0ebcf7 | 290 | return 0; |
1da177e4 LT |
291 | } |
292 | ||
293 | ||
294 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
295 | ||
296 | static struct acpi_processor_performance *acpi_processor_perf; | |
297 | ||
298 | static int powernow_acpi_init(void) | |
299 | { | |
300 | int i; | |
301 | int retval = 0; | |
302 | union powernow_acpi_control_t pc; | |
303 | ||
304 | if (acpi_processor_perf != NULL && powernow_table != NULL) { | |
305 | retval = -EINVAL; | |
306 | goto err0; | |
307 | } | |
308 | ||
d5b73cd8 | 309 | acpi_processor_perf = kzalloc(sizeof(*acpi_processor_perf), GFP_KERNEL); |
1da177e4 LT |
310 | if (!acpi_processor_perf) { |
311 | retval = -ENOMEM; | |
312 | goto err0; | |
313 | } | |
314 | ||
eaa95840 | 315 | if (!zalloc_cpumask_var(&acpi_processor_perf->shared_cpu_map, |
2fdf66b4 RR |
316 | GFP_KERNEL)) { |
317 | retval = -ENOMEM; | |
318 | goto err05; | |
319 | } | |
320 | ||
1da177e4 LT |
321 | if (acpi_processor_register_performance(acpi_processor_perf, 0)) { |
322 | retval = -EIO; | |
323 | goto err1; | |
324 | } | |
325 | ||
b9e7638a DJ |
326 | if (acpi_processor_perf->control_register.space_id != |
327 | ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
1da177e4 LT |
328 | retval = -ENODEV; |
329 | goto err2; | |
330 | } | |
331 | ||
b9e7638a DJ |
332 | if (acpi_processor_perf->status_register.space_id != |
333 | ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
1da177e4 LT |
334 | retval = -ENODEV; |
335 | goto err2; | |
336 | } | |
337 | ||
338 | number_scales = acpi_processor_perf->state_count; | |
339 | ||
340 | if (number_scales < 2) { | |
341 | retval = -ENODEV; | |
342 | goto err2; | |
343 | } | |
344 | ||
d5b73cd8 | 345 | powernow_table = kzalloc((sizeof(*powernow_table) * |
b9e7638a | 346 | (number_scales + 1)), GFP_KERNEL); |
1da177e4 LT |
347 | if (!powernow_table) { |
348 | retval = -ENOMEM; | |
349 | goto err2; | |
350 | } | |
351 | ||
1da177e4 LT |
352 | pc.val = (unsigned long) acpi_processor_perf->states[0].control; |
353 | for (i = 0; i < number_scales; i++) { | |
354 | u8 fid, vid; | |
dc2585eb DD |
355 | struct acpi_processor_px *state = |
356 | &acpi_processor_perf->states[i]; | |
357 | unsigned int speed, speed_mhz; | |
1da177e4 | 358 | |
dc2585eb | 359 | pc.val = (unsigned long) state->control; |
2d06d8c4 | 360 | pr_debug("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n", |
1da177e4 | 361 | i, |
dc2585eb DD |
362 | (u32) state->core_frequency, |
363 | (u32) state->power, | |
364 | (u32) state->transition_latency, | |
365 | (u32) state->control, | |
1da177e4 LT |
366 | pc.bits.sgtc); |
367 | ||
368 | vid = pc.bits.vid; | |
369 | fid = pc.bits.fid; | |
370 | ||
371 | powernow_table[i].frequency = fsb * fid_codes[fid] / 10; | |
50701588 VK |
372 | powernow_table[i].driver_data = fid; /* lower 8 bits */ |
373 | powernow_table[i].driver_data |= (vid << 8); /* upper 8 bits */ | |
1da177e4 LT |
374 | |
375 | speed = powernow_table[i].frequency; | |
dc2585eb DD |
376 | speed_mhz = speed / 1000; |
377 | ||
378 | /* processor_perflib will multiply the MHz value by 1000 to | |
379 | * get a KHz value (e.g. 1266000). However, powernow-k7 works | |
380 | * with true KHz values (e.g. 1266768). To ensure that all | |
381 | * powernow frequencies are available, we must ensure that | |
382 | * ACPI doesn't restrict them, so we round up the MHz value | |
383 | * to ensure that perflib's computed KHz value is greater than | |
384 | * or equal to powernow's KHz value. | |
385 | */ | |
386 | if (speed % 1000 > 0) | |
387 | speed_mhz++; | |
1da177e4 | 388 | |
b9e7638a | 389 | if ((fid_codes[fid] % 10) == 5) { |
1da177e4 | 390 | if (have_a0 == 1) |
b9e7638a | 391 | invalidate_entry(i); |
1da177e4 LT |
392 | } |
393 | ||
2d06d8c4 | 394 | pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) " |
32ee8c3e | 395 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
dc2585eb | 396 | fid_codes[fid] % 10, speed_mhz, vid, |
1da177e4 LT |
397 | mobile_vid_table[vid]/1000, |
398 | mobile_vid_table[vid]%1000); | |
399 | ||
dc2585eb DD |
400 | if (state->core_frequency != speed_mhz) { |
401 | state->core_frequency = speed_mhz; | |
2d06d8c4 | 402 | pr_debug(" Corrected ACPI frequency to %d\n", |
dc2585eb DD |
403 | speed_mhz); |
404 | } | |
405 | ||
1da177e4 LT |
406 | if (latency < pc.bits.sgtc) |
407 | latency = pc.bits.sgtc; | |
408 | ||
409 | if (speed < minimum_speed) | |
410 | minimum_speed = speed; | |
411 | if (speed > maximum_speed) | |
412 | maximum_speed = speed; | |
413 | } | |
414 | ||
415 | powernow_table[i].frequency = CPUFREQ_TABLE_END; | |
50701588 | 416 | powernow_table[i].driver_data = 0; |
1da177e4 LT |
417 | |
418 | /* notify BIOS that we exist */ | |
419 | acpi_processor_notify_smm(THIS_MODULE); | |
420 | ||
421 | return 0; | |
422 | ||
423 | err2: | |
424 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
425 | err1: | |
2fdf66b4 RR |
426 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
427 | err05: | |
1da177e4 LT |
428 | kfree(acpi_processor_perf); |
429 | err0: | |
b9e7638a DJ |
430 | printk(KERN_WARNING PFX "ACPI perflib can not be used on " |
431 | "this platform\n"); | |
1da177e4 LT |
432 | acpi_processor_perf = NULL; |
433 | return retval; | |
434 | } | |
435 | #else | |
436 | static int powernow_acpi_init(void) | |
437 | { | |
438 | printk(KERN_INFO PFX "no support for ACPI processor found." | |
439 | " Please recompile your kernel with ACPI processor\n"); | |
440 | return -EINVAL; | |
441 | } | |
442 | #endif | |
443 | ||
b9e7638a DJ |
444 | static void print_pst_entry(struct pst_s *pst, unsigned int j) |
445 | { | |
2d06d8c4 DB |
446 | pr_debug("PST:%d (@%p)\n", j, pst); |
447 | pr_debug(" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n", | |
b9e7638a DJ |
448 | pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid); |
449 | } | |
450 | ||
451 | static int powernow_decode_bios(int maxfid, int startvid) | |
1da177e4 LT |
452 | { |
453 | struct psb_s *psb; | |
454 | struct pst_s *pst; | |
455 | unsigned int i, j; | |
456 | unsigned char *p; | |
457 | unsigned int etuple; | |
458 | unsigned int ret; | |
459 | ||
460 | etuple = cpuid_eax(0x80000001); | |
461 | ||
b9e7638a | 462 | for (i = 0xC0000; i < 0xffff0 ; i += 16) { |
1da177e4 LT |
463 | |
464 | p = phys_to_virt(i); | |
465 | ||
b9e7638a | 466 | if (memcmp(p, "AMDK7PNOW!", 10) == 0) { |
2d06d8c4 | 467 | pr_debug("Found PSB header at %p\n", p); |
1da177e4 | 468 | psb = (struct psb_s *) p; |
2d06d8c4 | 469 | pr_debug("Table version: 0x%x\n", psb->tableversion); |
1da177e4 | 470 | if (psb->tableversion != 0x12) { |
b9e7638a DJ |
471 | printk(KERN_INFO PFX "Sorry, only v1.2 tables" |
472 | " supported right now\n"); | |
1da177e4 LT |
473 | return -ENODEV; |
474 | } | |
475 | ||
2d06d8c4 | 476 | pr_debug("Flags: 0x%x\n", psb->flags); |
b9e7638a | 477 | if ((psb->flags & 1) == 0) |
2d06d8c4 | 478 | pr_debug("Mobile voltage regulator\n"); |
b9e7638a | 479 | else |
2d06d8c4 | 480 | pr_debug("Desktop voltage regulator\n"); |
1da177e4 LT |
481 | |
482 | latency = psb->settlingtime; | |
483 | if (latency < 100) { | |
b9e7638a DJ |
484 | printk(KERN_INFO PFX "BIOS set settling time " |
485 | "to %d microseconds. " | |
486 | "Should be at least 100. " | |
487 | "Correcting.\n", latency); | |
1da177e4 LT |
488 | latency = 100; |
489 | } | |
2d06d8c4 | 490 | pr_debug("Settling Time: %d microseconds.\n", |
b9e7638a | 491 | psb->settlingtime); |
2d06d8c4 | 492 | pr_debug("Has %d PST tables. (Only dumping ones " |
b9e7638a DJ |
493 | "relevant to this CPU).\n", |
494 | psb->numpst); | |
1da177e4 | 495 | |
d5b73cd8 | 496 | p += sizeof(*psb); |
1da177e4 LT |
497 | |
498 | pst = (struct pst_s *) p; | |
499 | ||
b9e7638a | 500 | for (j = 0; j < psb->numpst; j++) { |
1da177e4 LT |
501 | pst = (struct pst_s *) p; |
502 | number_scales = pst->numpstates; | |
503 | ||
b9e7638a DJ |
504 | if ((etuple == pst->cpuid) && |
505 | check_fsb(pst->fsbspeed) && | |
506 | (maxfid == pst->maxfid) && | |
507 | (startvid == pst->startvid)) { | |
508 | print_pst_entry(pst, j); | |
d5b73cd8 | 509 | p = (char *)pst + sizeof(*pst); |
b9e7638a | 510 | ret = get_ranges(p); |
1da177e4 | 511 | return ret; |
1da177e4 | 512 | } else { |
8cbe0169 | 513 | unsigned int k; |
d5b73cd8 | 514 | p = (char *)pst + sizeof(*pst); |
b9e7638a DJ |
515 | for (k = 0; k < number_scales; k++) |
516 | p += 2; | |
1da177e4 LT |
517 | } |
518 | } | |
b9e7638a DJ |
519 | printk(KERN_INFO PFX "No PST tables match this cpuid " |
520 | "(0x%x)\n", etuple); | |
521 | printk(KERN_INFO PFX "This is indicative of a broken " | |
522 | "BIOS.\n"); | |
1da177e4 LT |
523 | |
524 | return -EINVAL; | |
525 | } | |
526 | p++; | |
527 | } | |
528 | ||
529 | return -ENODEV; | |
530 | } | |
531 | ||
532 | ||
1da177e4 LT |
533 | /* |
534 | * We use the fact that the bus frequency is somehow | |
535 | * a multiple of 100000/3 khz, then we compute sgtc according | |
536 | * to this multiple. | |
537 | * That way, we match more how AMD thinks all of that work. | |
538 | * We will then get the same kind of behaviour already tested under | |
539 | * the "well-known" other OS. | |
540 | */ | |
2760984f | 541 | static int fixup_sgtc(void) |
1da177e4 LT |
542 | { |
543 | unsigned int sgtc; | |
544 | unsigned int m; | |
545 | ||
546 | m = fsb / 3333; | |
547 | if ((m % 10) >= 5) | |
548 | m += 5; | |
549 | ||
550 | m /= 10; | |
551 | ||
552 | sgtc = 100 * m * latency; | |
553 | sgtc = sgtc / 3; | |
554 | if (sgtc > 0xfffff) { | |
555 | printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc); | |
556 | sgtc = 0xfffff; | |
557 | } | |
558 | return sgtc; | |
559 | } | |
560 | ||
561 | static unsigned int powernow_get(unsigned int cpu) | |
562 | { | |
563 | union msr_fidvidstatus fidvidstatus; | |
564 | unsigned int cfid; | |
565 | ||
566 | if (cpu) | |
567 | return 0; | |
b9e7638a | 568 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 LT |
569 | cfid = fidvidstatus.bits.CFID; |
570 | ||
b9e7638a | 571 | return fsb * fid_codes[cfid] / 10; |
1da177e4 LT |
572 | } |
573 | ||
574 | ||
2760984f | 575 | static int acer_cpufreq_pst(const struct dmi_system_id *d) |
1da177e4 | 576 | { |
b9e7638a DJ |
577 | printk(KERN_WARNING PFX |
578 | "%s laptop with broken PST tables in BIOS detected.\n", | |
579 | d->ident); | |
580 | printk(KERN_WARNING PFX | |
581 | "You need to downgrade to 3A21 (09/09/2002), or try a newer " | |
582 | "BIOS than 3A71 (01/20/2003)\n"); | |
583 | printk(KERN_WARNING PFX | |
584 | "cpufreq scaling has been disabled as a result of this.\n"); | |
1da177e4 LT |
585 | return 0; |
586 | } | |
587 | ||
588 | /* | |
589 | * Some Athlon laptops have really fucked PST tables. | |
590 | * A BIOS update is all that can save them. | |
591 | * Mention this, and disable cpufreq. | |
592 | */ | |
2760984f | 593 | static struct dmi_system_id powernow_dmi_table[] = { |
1da177e4 LT |
594 | { |
595 | .callback = acer_cpufreq_pst, | |
596 | .ident = "Acer Aspire", | |
597 | .matches = { | |
598 | DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"), | |
599 | DMI_MATCH(DMI_BIOS_VERSION, "3A71"), | |
600 | }, | |
601 | }, | |
602 | { } | |
603 | }; | |
604 | ||
2760984f | 605 | static int powernow_cpu_init(struct cpufreq_policy *policy) |
1da177e4 LT |
606 | { |
607 | union msr_fidvidstatus fidvidstatus; | |
608 | int result; | |
609 | ||
610 | if (policy->cpu != 0) | |
611 | return -ENODEV; | |
612 | ||
b9e7638a | 613 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 | 614 | |
436fe7b8 | 615 | recalibrate_cpu_khz(); |
91350ed4 DJ |
616 | |
617 | fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID]; | |
1da177e4 LT |
618 | if (!fsb) { |
619 | printk(KERN_WARNING PFX "can not determine bus frequency\n"); | |
620 | return -EINVAL; | |
621 | } | |
2d06d8c4 | 622 | pr_debug("FSB: %3dMHz\n", fsb/1000); |
1da177e4 LT |
623 | |
624 | if (dmi_check_system(powernow_dmi_table) || acpi_force) { | |
b9e7638a DJ |
625 | printk(KERN_INFO PFX "PSB/PST known to be broken. " |
626 | "Trying ACPI instead\n"); | |
1da177e4 LT |
627 | result = powernow_acpi_init(); |
628 | } else { | |
b9e7638a DJ |
629 | result = powernow_decode_bios(fidvidstatus.bits.MFID, |
630 | fidvidstatus.bits.SVID); | |
1da177e4 | 631 | if (result) { |
b9e7638a | 632 | printk(KERN_INFO PFX "Trying ACPI perflib\n"); |
1da177e4 LT |
633 | maximum_speed = 0; |
634 | minimum_speed = -1; | |
635 | latency = 0; | |
636 | result = powernow_acpi_init(); | |
637 | if (result) { | |
b9e7638a DJ |
638 | printk(KERN_INFO PFX |
639 | "ACPI and legacy methods failed\n"); | |
1da177e4 LT |
640 | } |
641 | } else { | |
642 | /* SGTC use the bus clock as timer */ | |
643 | latency = fixup_sgtc(); | |
644 | printk(KERN_INFO PFX "SGTC: %d\n", latency); | |
645 | } | |
646 | } | |
647 | ||
648 | if (result) | |
649 | return result; | |
650 | ||
b9e7638a | 651 | printk(KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n", |
1da177e4 LT |
652 | minimum_speed/1000, maximum_speed/1000); |
653 | ||
b9e7638a DJ |
654 | policy->cpuinfo.transition_latency = |
655 | cpufreq_scale(2000000UL, fsb, latency); | |
1da177e4 | 656 | |
b147405a | 657 | return cpufreq_table_validate_and_show(policy, powernow_table); |
1da177e4 LT |
658 | } |
659 | ||
b9e7638a DJ |
660 | static int powernow_cpu_exit(struct cpufreq_policy *policy) |
661 | { | |
1da177e4 LT |
662 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
663 | if (acpi_processor_perf) { | |
664 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
2fdf66b4 | 665 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
1da177e4 LT |
666 | kfree(acpi_processor_perf); |
667 | } | |
668 | #endif | |
669 | ||
4ae6673e | 670 | kfree(powernow_table); |
1da177e4 LT |
671 | return 0; |
672 | } | |
673 | ||
221dee28 | 674 | static struct cpufreq_driver powernow_driver = { |
d63bd27f | 675 | .verify = cpufreq_generic_frequency_table_verify, |
9c0ebcf7 | 676 | .target_index = powernow_target, |
e2f74f35 TR |
677 | .get = powernow_get, |
678 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
679 | .bios_limit = acpi_processor_get_bios_limit, | |
680 | #endif | |
681 | .init = powernow_cpu_init, | |
682 | .exit = powernow_cpu_exit, | |
683 | .name = "powernow-k7", | |
d63bd27f | 684 | .attr = cpufreq_generic_attr, |
1da177e4 LT |
685 | }; |
686 | ||
b9e7638a | 687 | static int __init powernow_init(void) |
1da177e4 | 688 | { |
b9e7638a | 689 | if (check_powernow() == 0) |
1da177e4 LT |
690 | return -ENODEV; |
691 | return cpufreq_register_driver(&powernow_driver); | |
692 | } | |
693 | ||
694 | ||
b9e7638a | 695 | static void __exit powernow_exit(void) |
1da177e4 LT |
696 | { |
697 | cpufreq_unregister_driver(&powernow_driver); | |
698 | } | |
699 | ||
700 | module_param(acpi_force, int, 0444); | |
701 | MODULE_PARM_DESC(acpi_force, "Force ACPI to be used."); | |
702 | ||
d5e80b4b | 703 | MODULE_AUTHOR("Dave Jones"); |
b9e7638a DJ |
704 | MODULE_DESCRIPTION("Powernow driver for AMD K7 processors."); |
705 | MODULE_LICENSE("GPL"); | |
1da177e4 LT |
706 | |
707 | late_initcall(powernow_init); | |
708 | module_exit(powernow_exit); | |
709 |