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> |
fa8031ae | 30 | #include <asm/cpu_device_id.h> |
1da177e4 LT |
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 | ||
fa8031ae | 113 | static const struct x86_cpu_id powernow_k7_cpuids[] = { |
30bcfff9 | 114 | { X86_VENDOR_AMD, 6, }, |
fa8031ae AK |
115 | {} |
116 | }; | |
117 | MODULE_DEVICE_TABLE(x86cpu, powernow_k7_cpuids); | |
118 | ||
1da177e4 LT |
119 | static int check_powernow(void) |
120 | { | |
92cb7612 | 121 | struct cpuinfo_x86 *c = &cpu_data(0); |
1da177e4 LT |
122 | unsigned int maxei, eax, ebx, ecx, edx; |
123 | ||
fa8031ae | 124 | if (!x86_match_cpu(powernow_k7_cpuids)) |
1da177e4 | 125 | return 0; |
1da177e4 LT |
126 | |
127 | /* Get maximum capabilities */ | |
b9e7638a | 128 | maxei = cpuid_eax(0x80000000); |
1da177e4 LT |
129 | if (maxei < 0x80000007) { /* Any powernow info ? */ |
130 | #ifdef MODULE | |
b9e7638a | 131 | printk(KERN_INFO PFX "No powernow capabilities detected\n"); |
1da177e4 LT |
132 | #endif |
133 | return 0; | |
134 | } | |
135 | ||
136 | if ((c->x86_model == 6) && (c->x86_mask == 0)) { | |
b9e7638a DJ |
137 | printk(KERN_INFO PFX "K7 660[A0] core detected, " |
138 | "enabling errata workarounds\n"); | |
1da177e4 LT |
139 | have_a0 = 1; |
140 | } | |
141 | ||
142 | cpuid(0x80000007, &eax, &ebx, &ecx, &edx); | |
143 | ||
144 | /* Check we can actually do something before we say anything.*/ | |
145 | if (!(edx & (1 << 1 | 1 << 2))) | |
146 | return 0; | |
147 | ||
b9e7638a | 148 | printk(KERN_INFO PFX "PowerNOW! Technology present. Can scale: "); |
1da177e4 LT |
149 | |
150 | if (edx & 1 << 1) { | |
b9e7638a DJ |
151 | printk("frequency"); |
152 | can_scale_bus = 1; | |
1da177e4 LT |
153 | } |
154 | ||
155 | if ((edx & (1 << 1 | 1 << 2)) == 0x6) | |
b9e7638a | 156 | printk(" and "); |
1da177e4 LT |
157 | |
158 | if (edx & 1 << 2) { | |
b9e7638a DJ |
159 | printk("voltage"); |
160 | can_scale_vid = 1; | |
1da177e4 LT |
161 | } |
162 | ||
b9e7638a | 163 | printk(".\n"); |
1da177e4 LT |
164 | return 1; |
165 | } | |
166 | ||
d38e73e8 | 167 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
b9e7638a DJ |
168 | static void invalidate_entry(unsigned int entry) |
169 | { | |
170 | powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID; | |
171 | } | |
d38e73e8 | 172 | #endif |
1da177e4 | 173 | |
b9e7638a | 174 | static int get_ranges(unsigned char *pst) |
1da177e4 LT |
175 | { |
176 | unsigned int j; | |
177 | unsigned int speed; | |
178 | u8 fid, vid; | |
179 | ||
d5b73cd8 | 180 | powernow_table = kzalloc((sizeof(*powernow_table) * |
b9e7638a | 181 | (number_scales + 1)), GFP_KERNEL); |
1da177e4 LT |
182 | if (!powernow_table) |
183 | return -ENOMEM; | |
1da177e4 | 184 | |
b9e7638a | 185 | for (j = 0 ; j < number_scales; j++) { |
1da177e4 LT |
186 | fid = *pst++; |
187 | ||
188 | powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10; | |
50701588 | 189 | powernow_table[j].driver_data = fid; /* lower 8 bits */ |
1da177e4 LT |
190 | |
191 | speed = powernow_table[j].frequency; | |
192 | ||
b9e7638a | 193 | if ((fid_codes[fid] % 10) == 5) { |
1da177e4 LT |
194 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
195 | if (have_a0 == 1) | |
b9e7638a | 196 | invalidate_entry(j); |
1da177e4 LT |
197 | #endif |
198 | } | |
199 | ||
200 | if (speed < minimum_speed) | |
201 | minimum_speed = speed; | |
202 | if (speed > maximum_speed) | |
203 | maximum_speed = speed; | |
204 | ||
205 | vid = *pst++; | |
50701588 | 206 | powernow_table[j].driver_data |= (vid << 8); /* upper 8 bits */ |
1da177e4 | 207 | |
2d06d8c4 | 208 | pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) " |
32ee8c3e DJ |
209 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
210 | fid_codes[fid] % 10, speed/1000, vid, | |
1da177e4 LT |
211 | mobile_vid_table[vid]/1000, |
212 | mobile_vid_table[vid]%1000); | |
213 | } | |
214 | powernow_table[number_scales].frequency = CPUFREQ_TABLE_END; | |
50701588 | 215 | powernow_table[number_scales].driver_data = 0; |
1da177e4 LT |
216 | |
217 | return 0; | |
218 | } | |
219 | ||
220 | ||
221 | static void change_FID(int fid) | |
222 | { | |
223 | union msr_fidvidctl fidvidctl; | |
224 | ||
b9e7638a | 225 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
226 | if (fidvidctl.bits.FID != fid) { |
227 | fidvidctl.bits.SGTC = latency; | |
228 | fidvidctl.bits.FID = fid; | |
229 | fidvidctl.bits.VIDC = 0; | |
230 | fidvidctl.bits.FIDC = 1; | |
b9e7638a | 231 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
232 | } |
233 | } | |
234 | ||
235 | ||
236 | static void change_VID(int vid) | |
237 | { | |
238 | union msr_fidvidctl fidvidctl; | |
239 | ||
b9e7638a | 240 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
241 | if (fidvidctl.bits.VID != vid) { |
242 | fidvidctl.bits.SGTC = latency; | |
243 | fidvidctl.bits.VID = vid; | |
244 | fidvidctl.bits.FIDC = 0; | |
245 | fidvidctl.bits.VIDC = 1; | |
b9e7638a | 246 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
247 | } |
248 | } | |
249 | ||
250 | ||
9c0ebcf7 | 251 | static int powernow_target(struct cpufreq_policy *policy, unsigned int index) |
1da177e4 LT |
252 | { |
253 | u8 fid, vid; | |
254 | struct cpufreq_freqs freqs; | |
255 | union msr_fidvidstatus fidvidstatus; | |
256 | int cfid; | |
257 | ||
258 | /* fid are the lower 8 bits of the index we stored into | |
259 | * the cpufreq frequency table in powernow_decode_bios, | |
260 | * vid are the upper 8 bits. | |
261 | */ | |
262 | ||
50701588 VK |
263 | fid = powernow_table[index].driver_data & 0xFF; |
264 | vid = (powernow_table[index].driver_data & 0xFF00) >> 8; | |
1da177e4 | 265 | |
b9e7638a | 266 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 LT |
267 | cfid = fidvidstatus.bits.CFID; |
268 | freqs.old = fsb * fid_codes[cfid] / 10; | |
269 | ||
270 | freqs.new = powernow_table[index].frequency; | |
271 | ||
1da177e4 LT |
272 | /* Now do the magic poking into the MSRs. */ |
273 | ||
274 | if (have_a0 == 1) /* A0 errata 5 */ | |
275 | local_irq_disable(); | |
276 | ||
277 | if (freqs.old > freqs.new) { | |
278 | /* Going down, so change FID first */ | |
279 | change_FID(fid); | |
280 | change_VID(vid); | |
281 | } else { | |
282 | /* Going up, so change VID first */ | |
283 | change_VID(vid); | |
284 | change_FID(fid); | |
285 | } | |
286 | ||
287 | ||
288 | if (have_a0 == 1) | |
289 | local_irq_enable(); | |
290 | ||
9c0ebcf7 | 291 | return 0; |
1da177e4 LT |
292 | } |
293 | ||
294 | ||
295 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
296 | ||
297 | static struct acpi_processor_performance *acpi_processor_perf; | |
298 | ||
299 | static int powernow_acpi_init(void) | |
300 | { | |
301 | int i; | |
302 | int retval = 0; | |
303 | union powernow_acpi_control_t pc; | |
304 | ||
305 | if (acpi_processor_perf != NULL && powernow_table != NULL) { | |
306 | retval = -EINVAL; | |
307 | goto err0; | |
308 | } | |
309 | ||
d5b73cd8 | 310 | acpi_processor_perf = kzalloc(sizeof(*acpi_processor_perf), GFP_KERNEL); |
1da177e4 LT |
311 | if (!acpi_processor_perf) { |
312 | retval = -ENOMEM; | |
313 | goto err0; | |
314 | } | |
315 | ||
eaa95840 | 316 | if (!zalloc_cpumask_var(&acpi_processor_perf->shared_cpu_map, |
2fdf66b4 RR |
317 | GFP_KERNEL)) { |
318 | retval = -ENOMEM; | |
319 | goto err05; | |
320 | } | |
321 | ||
1da177e4 LT |
322 | if (acpi_processor_register_performance(acpi_processor_perf, 0)) { |
323 | retval = -EIO; | |
324 | goto err1; | |
325 | } | |
326 | ||
b9e7638a DJ |
327 | if (acpi_processor_perf->control_register.space_id != |
328 | ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
1da177e4 LT |
329 | retval = -ENODEV; |
330 | goto err2; | |
331 | } | |
332 | ||
b9e7638a DJ |
333 | if (acpi_processor_perf->status_register.space_id != |
334 | ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
1da177e4 LT |
335 | retval = -ENODEV; |
336 | goto err2; | |
337 | } | |
338 | ||
339 | number_scales = acpi_processor_perf->state_count; | |
340 | ||
341 | if (number_scales < 2) { | |
342 | retval = -ENODEV; | |
343 | goto err2; | |
344 | } | |
345 | ||
d5b73cd8 | 346 | powernow_table = kzalloc((sizeof(*powernow_table) * |
b9e7638a | 347 | (number_scales + 1)), GFP_KERNEL); |
1da177e4 LT |
348 | if (!powernow_table) { |
349 | retval = -ENOMEM; | |
350 | goto err2; | |
351 | } | |
352 | ||
1da177e4 LT |
353 | pc.val = (unsigned long) acpi_processor_perf->states[0].control; |
354 | for (i = 0; i < number_scales; i++) { | |
355 | u8 fid, vid; | |
dc2585eb DD |
356 | struct acpi_processor_px *state = |
357 | &acpi_processor_perf->states[i]; | |
358 | unsigned int speed, speed_mhz; | |
1da177e4 | 359 | |
dc2585eb | 360 | pc.val = (unsigned long) state->control; |
2d06d8c4 | 361 | pr_debug("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n", |
1da177e4 | 362 | i, |
dc2585eb DD |
363 | (u32) state->core_frequency, |
364 | (u32) state->power, | |
365 | (u32) state->transition_latency, | |
366 | (u32) state->control, | |
1da177e4 LT |
367 | pc.bits.sgtc); |
368 | ||
369 | vid = pc.bits.vid; | |
370 | fid = pc.bits.fid; | |
371 | ||
372 | powernow_table[i].frequency = fsb * fid_codes[fid] / 10; | |
50701588 VK |
373 | powernow_table[i].driver_data = fid; /* lower 8 bits */ |
374 | powernow_table[i].driver_data |= (vid << 8); /* upper 8 bits */ | |
1da177e4 LT |
375 | |
376 | speed = powernow_table[i].frequency; | |
dc2585eb DD |
377 | speed_mhz = speed / 1000; |
378 | ||
379 | /* processor_perflib will multiply the MHz value by 1000 to | |
380 | * get a KHz value (e.g. 1266000). However, powernow-k7 works | |
381 | * with true KHz values (e.g. 1266768). To ensure that all | |
382 | * powernow frequencies are available, we must ensure that | |
383 | * ACPI doesn't restrict them, so we round up the MHz value | |
384 | * to ensure that perflib's computed KHz value is greater than | |
385 | * or equal to powernow's KHz value. | |
386 | */ | |
387 | if (speed % 1000 > 0) | |
388 | speed_mhz++; | |
1da177e4 | 389 | |
b9e7638a | 390 | if ((fid_codes[fid] % 10) == 5) { |
1da177e4 | 391 | if (have_a0 == 1) |
b9e7638a | 392 | invalidate_entry(i); |
1da177e4 LT |
393 | } |
394 | ||
2d06d8c4 | 395 | pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) " |
32ee8c3e | 396 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
dc2585eb | 397 | fid_codes[fid] % 10, speed_mhz, vid, |
1da177e4 LT |
398 | mobile_vid_table[vid]/1000, |
399 | mobile_vid_table[vid]%1000); | |
400 | ||
dc2585eb DD |
401 | if (state->core_frequency != speed_mhz) { |
402 | state->core_frequency = speed_mhz; | |
2d06d8c4 | 403 | pr_debug(" Corrected ACPI frequency to %d\n", |
dc2585eb DD |
404 | speed_mhz); |
405 | } | |
406 | ||
1da177e4 LT |
407 | if (latency < pc.bits.sgtc) |
408 | latency = pc.bits.sgtc; | |
409 | ||
410 | if (speed < minimum_speed) | |
411 | minimum_speed = speed; | |
412 | if (speed > maximum_speed) | |
413 | maximum_speed = speed; | |
414 | } | |
415 | ||
416 | powernow_table[i].frequency = CPUFREQ_TABLE_END; | |
50701588 | 417 | powernow_table[i].driver_data = 0; |
1da177e4 LT |
418 | |
419 | /* notify BIOS that we exist */ | |
420 | acpi_processor_notify_smm(THIS_MODULE); | |
421 | ||
422 | return 0; | |
423 | ||
424 | err2: | |
425 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
426 | err1: | |
2fdf66b4 RR |
427 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
428 | err05: | |
1da177e4 LT |
429 | kfree(acpi_processor_perf); |
430 | err0: | |
b9e7638a DJ |
431 | printk(KERN_WARNING PFX "ACPI perflib can not be used on " |
432 | "this platform\n"); | |
1da177e4 LT |
433 | acpi_processor_perf = NULL; |
434 | return retval; | |
435 | } | |
436 | #else | |
437 | static int powernow_acpi_init(void) | |
438 | { | |
439 | printk(KERN_INFO PFX "no support for ACPI processor found." | |
440 | " Please recompile your kernel with ACPI processor\n"); | |
441 | return -EINVAL; | |
442 | } | |
443 | #endif | |
444 | ||
b9e7638a DJ |
445 | static void print_pst_entry(struct pst_s *pst, unsigned int j) |
446 | { | |
2d06d8c4 DB |
447 | pr_debug("PST:%d (@%p)\n", j, pst); |
448 | pr_debug(" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n", | |
b9e7638a DJ |
449 | pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid); |
450 | } | |
451 | ||
452 | static int powernow_decode_bios(int maxfid, int startvid) | |
1da177e4 LT |
453 | { |
454 | struct psb_s *psb; | |
455 | struct pst_s *pst; | |
456 | unsigned int i, j; | |
457 | unsigned char *p; | |
458 | unsigned int etuple; | |
459 | unsigned int ret; | |
460 | ||
461 | etuple = cpuid_eax(0x80000001); | |
462 | ||
b9e7638a | 463 | for (i = 0xC0000; i < 0xffff0 ; i += 16) { |
1da177e4 LT |
464 | |
465 | p = phys_to_virt(i); | |
466 | ||
b9e7638a | 467 | if (memcmp(p, "AMDK7PNOW!", 10) == 0) { |
2d06d8c4 | 468 | pr_debug("Found PSB header at %p\n", p); |
1da177e4 | 469 | psb = (struct psb_s *) p; |
2d06d8c4 | 470 | pr_debug("Table version: 0x%x\n", psb->tableversion); |
1da177e4 | 471 | if (psb->tableversion != 0x12) { |
b9e7638a DJ |
472 | printk(KERN_INFO PFX "Sorry, only v1.2 tables" |
473 | " supported right now\n"); | |
1da177e4 LT |
474 | return -ENODEV; |
475 | } | |
476 | ||
2d06d8c4 | 477 | pr_debug("Flags: 0x%x\n", psb->flags); |
b9e7638a | 478 | if ((psb->flags & 1) == 0) |
2d06d8c4 | 479 | pr_debug("Mobile voltage regulator\n"); |
b9e7638a | 480 | else |
2d06d8c4 | 481 | pr_debug("Desktop voltage regulator\n"); |
1da177e4 LT |
482 | |
483 | latency = psb->settlingtime; | |
484 | if (latency < 100) { | |
b9e7638a DJ |
485 | printk(KERN_INFO PFX "BIOS set settling time " |
486 | "to %d microseconds. " | |
487 | "Should be at least 100. " | |
488 | "Correcting.\n", latency); | |
1da177e4 LT |
489 | latency = 100; |
490 | } | |
2d06d8c4 | 491 | pr_debug("Settling Time: %d microseconds.\n", |
b9e7638a | 492 | psb->settlingtime); |
2d06d8c4 | 493 | pr_debug("Has %d PST tables. (Only dumping ones " |
b9e7638a DJ |
494 | "relevant to this CPU).\n", |
495 | psb->numpst); | |
1da177e4 | 496 | |
d5b73cd8 | 497 | p += sizeof(*psb); |
1da177e4 LT |
498 | |
499 | pst = (struct pst_s *) p; | |
500 | ||
b9e7638a | 501 | for (j = 0; j < psb->numpst; j++) { |
1da177e4 LT |
502 | pst = (struct pst_s *) p; |
503 | number_scales = pst->numpstates; | |
504 | ||
b9e7638a DJ |
505 | if ((etuple == pst->cpuid) && |
506 | check_fsb(pst->fsbspeed) && | |
507 | (maxfid == pst->maxfid) && | |
508 | (startvid == pst->startvid)) { | |
509 | print_pst_entry(pst, j); | |
d5b73cd8 | 510 | p = (char *)pst + sizeof(*pst); |
b9e7638a | 511 | ret = get_ranges(p); |
1da177e4 | 512 | return ret; |
1da177e4 | 513 | } else { |
8cbe0169 | 514 | unsigned int k; |
d5b73cd8 | 515 | p = (char *)pst + sizeof(*pst); |
b9e7638a DJ |
516 | for (k = 0; k < number_scales; k++) |
517 | p += 2; | |
1da177e4 LT |
518 | } |
519 | } | |
b9e7638a DJ |
520 | printk(KERN_INFO PFX "No PST tables match this cpuid " |
521 | "(0x%x)\n", etuple); | |
522 | printk(KERN_INFO PFX "This is indicative of a broken " | |
523 | "BIOS.\n"); | |
1da177e4 LT |
524 | |
525 | return -EINVAL; | |
526 | } | |
527 | p++; | |
528 | } | |
529 | ||
530 | return -ENODEV; | |
531 | } | |
532 | ||
533 | ||
1da177e4 LT |
534 | /* |
535 | * We use the fact that the bus frequency is somehow | |
536 | * a multiple of 100000/3 khz, then we compute sgtc according | |
537 | * to this multiple. | |
538 | * That way, we match more how AMD thinks all of that work. | |
539 | * We will then get the same kind of behaviour already tested under | |
540 | * the "well-known" other OS. | |
541 | */ | |
2760984f | 542 | static int fixup_sgtc(void) |
1da177e4 LT |
543 | { |
544 | unsigned int sgtc; | |
545 | unsigned int m; | |
546 | ||
547 | m = fsb / 3333; | |
548 | if ((m % 10) >= 5) | |
549 | m += 5; | |
550 | ||
551 | m /= 10; | |
552 | ||
553 | sgtc = 100 * m * latency; | |
554 | sgtc = sgtc / 3; | |
555 | if (sgtc > 0xfffff) { | |
556 | printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc); | |
557 | sgtc = 0xfffff; | |
558 | } | |
559 | return sgtc; | |
560 | } | |
561 | ||
562 | static unsigned int powernow_get(unsigned int cpu) | |
563 | { | |
564 | union msr_fidvidstatus fidvidstatus; | |
565 | unsigned int cfid; | |
566 | ||
567 | if (cpu) | |
568 | return 0; | |
b9e7638a | 569 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 LT |
570 | cfid = fidvidstatus.bits.CFID; |
571 | ||
b9e7638a | 572 | return fsb * fid_codes[cfid] / 10; |
1da177e4 LT |
573 | } |
574 | ||
575 | ||
2760984f | 576 | static int acer_cpufreq_pst(const struct dmi_system_id *d) |
1da177e4 | 577 | { |
b9e7638a DJ |
578 | printk(KERN_WARNING PFX |
579 | "%s laptop with broken PST tables in BIOS detected.\n", | |
580 | d->ident); | |
581 | printk(KERN_WARNING PFX | |
582 | "You need to downgrade to 3A21 (09/09/2002), or try a newer " | |
583 | "BIOS than 3A71 (01/20/2003)\n"); | |
584 | printk(KERN_WARNING PFX | |
585 | "cpufreq scaling has been disabled as a result of this.\n"); | |
1da177e4 LT |
586 | return 0; |
587 | } | |
588 | ||
589 | /* | |
590 | * Some Athlon laptops have really fucked PST tables. | |
591 | * A BIOS update is all that can save them. | |
592 | * Mention this, and disable cpufreq. | |
593 | */ | |
2760984f | 594 | static struct dmi_system_id powernow_dmi_table[] = { |
1da177e4 LT |
595 | { |
596 | .callback = acer_cpufreq_pst, | |
597 | .ident = "Acer Aspire", | |
598 | .matches = { | |
599 | DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"), | |
600 | DMI_MATCH(DMI_BIOS_VERSION, "3A71"), | |
601 | }, | |
602 | }, | |
603 | { } | |
604 | }; | |
605 | ||
2760984f | 606 | static int powernow_cpu_init(struct cpufreq_policy *policy) |
1da177e4 LT |
607 | { |
608 | union msr_fidvidstatus fidvidstatus; | |
609 | int result; | |
610 | ||
611 | if (policy->cpu != 0) | |
612 | return -ENODEV; | |
613 | ||
b9e7638a | 614 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 | 615 | |
436fe7b8 | 616 | recalibrate_cpu_khz(); |
91350ed4 DJ |
617 | |
618 | fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID]; | |
1da177e4 LT |
619 | if (!fsb) { |
620 | printk(KERN_WARNING PFX "can not determine bus frequency\n"); | |
621 | return -EINVAL; | |
622 | } | |
2d06d8c4 | 623 | pr_debug("FSB: %3dMHz\n", fsb/1000); |
1da177e4 LT |
624 | |
625 | if (dmi_check_system(powernow_dmi_table) || acpi_force) { | |
b9e7638a DJ |
626 | printk(KERN_INFO PFX "PSB/PST known to be broken. " |
627 | "Trying ACPI instead\n"); | |
1da177e4 LT |
628 | result = powernow_acpi_init(); |
629 | } else { | |
b9e7638a DJ |
630 | result = powernow_decode_bios(fidvidstatus.bits.MFID, |
631 | fidvidstatus.bits.SVID); | |
1da177e4 | 632 | if (result) { |
b9e7638a | 633 | printk(KERN_INFO PFX "Trying ACPI perflib\n"); |
1da177e4 LT |
634 | maximum_speed = 0; |
635 | minimum_speed = -1; | |
636 | latency = 0; | |
637 | result = powernow_acpi_init(); | |
638 | if (result) { | |
b9e7638a DJ |
639 | printk(KERN_INFO PFX |
640 | "ACPI and legacy methods failed\n"); | |
1da177e4 LT |
641 | } |
642 | } else { | |
643 | /* SGTC use the bus clock as timer */ | |
644 | latency = fixup_sgtc(); | |
645 | printk(KERN_INFO PFX "SGTC: %d\n", latency); | |
646 | } | |
647 | } | |
648 | ||
649 | if (result) | |
650 | return result; | |
651 | ||
b9e7638a | 652 | printk(KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n", |
1da177e4 LT |
653 | minimum_speed/1000, maximum_speed/1000); |
654 | ||
b9e7638a DJ |
655 | policy->cpuinfo.transition_latency = |
656 | cpufreq_scale(2000000UL, fsb, latency); | |
1da177e4 | 657 | |
b147405a | 658 | return cpufreq_table_validate_and_show(policy, powernow_table); |
1da177e4 LT |
659 | } |
660 | ||
b9e7638a DJ |
661 | static int powernow_cpu_exit(struct cpufreq_policy *policy) |
662 | { | |
1da177e4 LT |
663 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
664 | if (acpi_processor_perf) { | |
665 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
2fdf66b4 | 666 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
1da177e4 LT |
667 | kfree(acpi_processor_perf); |
668 | } | |
669 | #endif | |
670 | ||
4ae6673e | 671 | kfree(powernow_table); |
1da177e4 LT |
672 | return 0; |
673 | } | |
674 | ||
221dee28 | 675 | static struct cpufreq_driver powernow_driver = { |
d63bd27f | 676 | .verify = cpufreq_generic_frequency_table_verify, |
9c0ebcf7 | 677 | .target_index = powernow_target, |
e2f74f35 TR |
678 | .get = powernow_get, |
679 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
680 | .bios_limit = acpi_processor_get_bios_limit, | |
681 | #endif | |
682 | .init = powernow_cpu_init, | |
683 | .exit = powernow_cpu_exit, | |
684 | .name = "powernow-k7", | |
d63bd27f | 685 | .attr = cpufreq_generic_attr, |
1da177e4 LT |
686 | }; |
687 | ||
b9e7638a | 688 | static int __init powernow_init(void) |
1da177e4 | 689 | { |
b9e7638a | 690 | if (check_powernow() == 0) |
1da177e4 LT |
691 | return -ENODEV; |
692 | return cpufreq_register_driver(&powernow_driver); | |
693 | } | |
694 | ||
695 | ||
b9e7638a | 696 | static void __exit powernow_exit(void) |
1da177e4 LT |
697 | { |
698 | cpufreq_unregister_driver(&powernow_driver); | |
699 | } | |
700 | ||
701 | module_param(acpi_force, int, 0444); | |
702 | MODULE_PARM_DESC(acpi_force, "Force ACPI to be used."); | |
703 | ||
b9e7638a DJ |
704 | MODULE_AUTHOR("Dave Jones <davej@redhat.com>"); |
705 | MODULE_DESCRIPTION("Powernow driver for AMD K7 processors."); | |
706 | MODULE_LICENSE("GPL"); | |
1da177e4 LT |
707 | |
708 | late_initcall(powernow_init); | |
709 | module_exit(powernow_exit); | |
710 |