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 | 30 | #include <asm/system.h> |
fa8031ae | 31 | #include <asm/cpu_device_id.h> |
1da177e4 LT |
32 | |
33 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
34 | #include <linux/acpi.h> | |
35 | #include <acpi/processor.h> | |
36 | #endif | |
37 | ||
38 | #include "powernow-k7.h" | |
39 | ||
40 | #define PFX "powernow: " | |
41 | ||
42 | ||
43 | struct psb_s { | |
44 | u8 signature[10]; | |
45 | u8 tableversion; | |
46 | u8 flags; | |
47 | u16 settlingtime; | |
48 | u8 reserved1; | |
49 | u8 numpst; | |
50 | }; | |
51 | ||
52 | struct pst_s { | |
53 | u32 cpuid; | |
54 | u8 fsbspeed; | |
55 | u8 maxfid; | |
56 | u8 startvid; | |
57 | u8 numpstates; | |
58 | }; | |
59 | ||
60 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
61 | union powernow_acpi_control_t { | |
62 | struct { | |
63 | unsigned long fid:5, | |
b9e7638a DJ |
64 | vid:5, |
65 | sgtc:20, | |
66 | res1:2; | |
1da177e4 LT |
67 | } bits; |
68 | unsigned long val; | |
69 | }; | |
70 | #endif | |
71 | ||
1da177e4 | 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 | }; | |
1da177e4 LT |
79 | |
80 | /* divide by 10 to get FID. */ | |
bd5ab26a | 81 | static const int fid_codes[32] = { |
1da177e4 LT |
82 | 110, 115, 120, 125, 50, 55, 60, 65, |
83 | 70, 75, 80, 85, 90, 95, 100, 105, | |
84 | 30, 190, 40, 200, 130, 135, 140, 210, | |
85 | 150, 225, 160, 165, 170, 180, -1, -1, | |
86 | }; | |
87 | ||
88 | /* This parameter is used in order to force ACPI instead of legacy method for | |
89 | * configuration purpose. | |
90 | */ | |
91 | ||
92 | static int acpi_force; | |
93 | ||
94 | static struct cpufreq_frequency_table *powernow_table; | |
95 | ||
96 | static unsigned int can_scale_bus; | |
97 | static unsigned int can_scale_vid; | |
fff78ad5 | 98 | static unsigned int minimum_speed = -1; |
1da177e4 LT |
99 | static unsigned int maximum_speed; |
100 | static unsigned int number_scales; | |
101 | static unsigned int fsb; | |
102 | static unsigned int latency; | |
103 | static char have_a0; | |
104 | ||
1da177e4 LT |
105 | static int check_fsb(unsigned int fsbspeed) |
106 | { | |
107 | int delta; | |
108 | unsigned int f = fsb / 1000; | |
109 | ||
110 | delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed; | |
b9e7638a | 111 | return delta < 5; |
1da177e4 LT |
112 | } |
113 | ||
fa8031ae | 114 | static const struct x86_cpu_id powernow_k7_cpuids[] = { |
30bcfff9 | 115 | { X86_VENDOR_AMD, 6, }, |
fa8031ae AK |
116 | {} |
117 | }; | |
118 | MODULE_DEVICE_TABLE(x86cpu, powernow_k7_cpuids); | |
119 | ||
1da177e4 LT |
120 | static int check_powernow(void) |
121 | { | |
92cb7612 | 122 | struct cpuinfo_x86 *c = &cpu_data(0); |
1da177e4 LT |
123 | unsigned int maxei, eax, ebx, ecx, edx; |
124 | ||
fa8031ae | 125 | if (!x86_match_cpu(powernow_k7_cpuids)) |
1da177e4 | 126 | return 0; |
1da177e4 LT |
127 | |
128 | /* Get maximum capabilities */ | |
b9e7638a | 129 | maxei = cpuid_eax(0x80000000); |
1da177e4 LT |
130 | if (maxei < 0x80000007) { /* Any powernow info ? */ |
131 | #ifdef MODULE | |
b9e7638a | 132 | printk(KERN_INFO PFX "No powernow capabilities detected\n"); |
1da177e4 LT |
133 | #endif |
134 | return 0; | |
135 | } | |
136 | ||
137 | if ((c->x86_model == 6) && (c->x86_mask == 0)) { | |
b9e7638a DJ |
138 | printk(KERN_INFO PFX "K7 660[A0] core detected, " |
139 | "enabling errata workarounds\n"); | |
1da177e4 LT |
140 | have_a0 = 1; |
141 | } | |
142 | ||
143 | cpuid(0x80000007, &eax, &ebx, &ecx, &edx); | |
144 | ||
145 | /* Check we can actually do something before we say anything.*/ | |
146 | if (!(edx & (1 << 1 | 1 << 2))) | |
147 | return 0; | |
148 | ||
b9e7638a | 149 | printk(KERN_INFO PFX "PowerNOW! Technology present. Can scale: "); |
1da177e4 LT |
150 | |
151 | if (edx & 1 << 1) { | |
b9e7638a DJ |
152 | printk("frequency"); |
153 | can_scale_bus = 1; | |
1da177e4 LT |
154 | } |
155 | ||
156 | if ((edx & (1 << 1 | 1 << 2)) == 0x6) | |
b9e7638a | 157 | printk(" and "); |
1da177e4 LT |
158 | |
159 | if (edx & 1 << 2) { | |
b9e7638a DJ |
160 | printk("voltage"); |
161 | can_scale_vid = 1; | |
1da177e4 LT |
162 | } |
163 | ||
b9e7638a | 164 | printk(".\n"); |
1da177e4 LT |
165 | return 1; |
166 | } | |
167 | ||
d38e73e8 | 168 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
b9e7638a DJ |
169 | static void invalidate_entry(unsigned int entry) |
170 | { | |
171 | powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID; | |
172 | } | |
d38e73e8 | 173 | #endif |
1da177e4 | 174 | |
b9e7638a | 175 | static int get_ranges(unsigned char *pst) |
1da177e4 LT |
176 | { |
177 | unsigned int j; | |
178 | unsigned int speed; | |
179 | u8 fid, vid; | |
180 | ||
b9e7638a DJ |
181 | powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * |
182 | (number_scales + 1)), GFP_KERNEL); | |
1da177e4 LT |
183 | if (!powernow_table) |
184 | return -ENOMEM; | |
1da177e4 | 185 | |
b9e7638a | 186 | for (j = 0 ; j < number_scales; j++) { |
1da177e4 LT |
187 | fid = *pst++; |
188 | ||
189 | powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10; | |
190 | powernow_table[j].index = fid; /* lower 8 bits */ | |
191 | ||
192 | speed = powernow_table[j].frequency; | |
193 | ||
b9e7638a | 194 | if ((fid_codes[fid] % 10) == 5) { |
1da177e4 LT |
195 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
196 | if (have_a0 == 1) | |
b9e7638a | 197 | invalidate_entry(j); |
1da177e4 LT |
198 | #endif |
199 | } | |
200 | ||
201 | if (speed < minimum_speed) | |
202 | minimum_speed = speed; | |
203 | if (speed > maximum_speed) | |
204 | maximum_speed = speed; | |
205 | ||
206 | vid = *pst++; | |
207 | powernow_table[j].index |= (vid << 8); /* upper 8 bits */ | |
208 | ||
2d06d8c4 | 209 | pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) " |
32ee8c3e DJ |
210 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
211 | fid_codes[fid] % 10, speed/1000, vid, | |
1da177e4 LT |
212 | mobile_vid_table[vid]/1000, |
213 | mobile_vid_table[vid]%1000); | |
214 | } | |
215 | powernow_table[number_scales].frequency = CPUFREQ_TABLE_END; | |
216 | powernow_table[number_scales].index = 0; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | ||
222 | static void change_FID(int fid) | |
223 | { | |
224 | union msr_fidvidctl fidvidctl; | |
225 | ||
b9e7638a | 226 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
227 | if (fidvidctl.bits.FID != fid) { |
228 | fidvidctl.bits.SGTC = latency; | |
229 | fidvidctl.bits.FID = fid; | |
230 | fidvidctl.bits.VIDC = 0; | |
231 | fidvidctl.bits.FIDC = 1; | |
b9e7638a | 232 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
233 | } |
234 | } | |
235 | ||
236 | ||
237 | static void change_VID(int vid) | |
238 | { | |
239 | union msr_fidvidctl fidvidctl; | |
240 | ||
b9e7638a | 241 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
242 | if (fidvidctl.bits.VID != vid) { |
243 | fidvidctl.bits.SGTC = latency; | |
244 | fidvidctl.bits.VID = vid; | |
245 | fidvidctl.bits.FIDC = 0; | |
246 | fidvidctl.bits.VIDC = 1; | |
b9e7638a | 247 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
248 | } |
249 | } | |
250 | ||
251 | ||
b9e7638a | 252 | static void change_speed(unsigned int index) |
1da177e4 LT |
253 | { |
254 | u8 fid, vid; | |
255 | struct cpufreq_freqs freqs; | |
256 | union msr_fidvidstatus fidvidstatus; | |
257 | int cfid; | |
258 | ||
259 | /* fid are the lower 8 bits of the index we stored into | |
260 | * the cpufreq frequency table in powernow_decode_bios, | |
261 | * vid are the upper 8 bits. | |
262 | */ | |
263 | ||
264 | fid = powernow_table[index].index & 0xFF; | |
265 | vid = (powernow_table[index].index & 0xFF00) >> 8; | |
266 | ||
267 | freqs.cpu = 0; | |
268 | ||
b9e7638a | 269 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 LT |
270 | cfid = fidvidstatus.bits.CFID; |
271 | freqs.old = fsb * fid_codes[cfid] / 10; | |
272 | ||
273 | freqs.new = powernow_table[index].frequency; | |
274 | ||
275 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
276 | ||
277 | /* Now do the magic poking into the MSRs. */ | |
278 | ||
279 | if (have_a0 == 1) /* A0 errata 5 */ | |
280 | local_irq_disable(); | |
281 | ||
282 | if (freqs.old > freqs.new) { | |
283 | /* Going down, so change FID first */ | |
284 | change_FID(fid); | |
285 | change_VID(vid); | |
286 | } else { | |
287 | /* Going up, so change VID first */ | |
288 | change_VID(vid); | |
289 | change_FID(fid); | |
290 | } | |
291 | ||
292 | ||
293 | if (have_a0 == 1) | |
294 | local_irq_enable(); | |
295 | ||
296 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
297 | } | |
298 | ||
299 | ||
300 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
301 | ||
302 | static struct acpi_processor_performance *acpi_processor_perf; | |
303 | ||
304 | static int powernow_acpi_init(void) | |
305 | { | |
306 | int i; | |
307 | int retval = 0; | |
308 | union powernow_acpi_control_t pc; | |
309 | ||
310 | if (acpi_processor_perf != NULL && powernow_table != NULL) { | |
311 | retval = -EINVAL; | |
312 | goto err0; | |
313 | } | |
314 | ||
bfdc708d | 315 | acpi_processor_perf = kzalloc(sizeof(struct acpi_processor_performance), |
1da177e4 | 316 | GFP_KERNEL); |
1da177e4 LT |
317 | if (!acpi_processor_perf) { |
318 | retval = -ENOMEM; | |
319 | goto err0; | |
320 | } | |
321 | ||
eaa95840 | 322 | if (!zalloc_cpumask_var(&acpi_processor_perf->shared_cpu_map, |
2fdf66b4 RR |
323 | GFP_KERNEL)) { |
324 | retval = -ENOMEM; | |
325 | goto err05; | |
326 | } | |
327 | ||
1da177e4 LT |
328 | if (acpi_processor_register_performance(acpi_processor_perf, 0)) { |
329 | retval = -EIO; | |
330 | goto err1; | |
331 | } | |
332 | ||
b9e7638a DJ |
333 | if (acpi_processor_perf->control_register.space_id != |
334 | ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
1da177e4 LT |
335 | retval = -ENODEV; |
336 | goto err2; | |
337 | } | |
338 | ||
b9e7638a DJ |
339 | if (acpi_processor_perf->status_register.space_id != |
340 | ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
1da177e4 LT |
341 | retval = -ENODEV; |
342 | goto err2; | |
343 | } | |
344 | ||
345 | number_scales = acpi_processor_perf->state_count; | |
346 | ||
347 | if (number_scales < 2) { | |
348 | retval = -ENODEV; | |
349 | goto err2; | |
350 | } | |
351 | ||
b9e7638a DJ |
352 | powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) * |
353 | (number_scales + 1)), GFP_KERNEL); | |
1da177e4 LT |
354 | if (!powernow_table) { |
355 | retval = -ENOMEM; | |
356 | goto err2; | |
357 | } | |
358 | ||
1da177e4 LT |
359 | pc.val = (unsigned long) acpi_processor_perf->states[0].control; |
360 | for (i = 0; i < number_scales; i++) { | |
361 | u8 fid, vid; | |
dc2585eb DD |
362 | struct acpi_processor_px *state = |
363 | &acpi_processor_perf->states[i]; | |
364 | unsigned int speed, speed_mhz; | |
1da177e4 | 365 | |
dc2585eb | 366 | pc.val = (unsigned long) state->control; |
2d06d8c4 | 367 | pr_debug("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n", |
1da177e4 | 368 | i, |
dc2585eb DD |
369 | (u32) state->core_frequency, |
370 | (u32) state->power, | |
371 | (u32) state->transition_latency, | |
372 | (u32) state->control, | |
1da177e4 LT |
373 | pc.bits.sgtc); |
374 | ||
375 | vid = pc.bits.vid; | |
376 | fid = pc.bits.fid; | |
377 | ||
378 | powernow_table[i].frequency = fsb * fid_codes[fid] / 10; | |
379 | powernow_table[i].index = fid; /* lower 8 bits */ | |
380 | powernow_table[i].index |= (vid << 8); /* upper 8 bits */ | |
381 | ||
382 | speed = powernow_table[i].frequency; | |
dc2585eb DD |
383 | speed_mhz = speed / 1000; |
384 | ||
385 | /* processor_perflib will multiply the MHz value by 1000 to | |
386 | * get a KHz value (e.g. 1266000). However, powernow-k7 works | |
387 | * with true KHz values (e.g. 1266768). To ensure that all | |
388 | * powernow frequencies are available, we must ensure that | |
389 | * ACPI doesn't restrict them, so we round up the MHz value | |
390 | * to ensure that perflib's computed KHz value is greater than | |
391 | * or equal to powernow's KHz value. | |
392 | */ | |
393 | if (speed % 1000 > 0) | |
394 | speed_mhz++; | |
1da177e4 | 395 | |
b9e7638a | 396 | if ((fid_codes[fid] % 10) == 5) { |
1da177e4 | 397 | if (have_a0 == 1) |
b9e7638a | 398 | invalidate_entry(i); |
1da177e4 LT |
399 | } |
400 | ||
2d06d8c4 | 401 | pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) " |
32ee8c3e | 402 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
dc2585eb | 403 | fid_codes[fid] % 10, speed_mhz, vid, |
1da177e4 LT |
404 | mobile_vid_table[vid]/1000, |
405 | mobile_vid_table[vid]%1000); | |
406 | ||
dc2585eb DD |
407 | if (state->core_frequency != speed_mhz) { |
408 | state->core_frequency = speed_mhz; | |
2d06d8c4 | 409 | pr_debug(" Corrected ACPI frequency to %d\n", |
dc2585eb DD |
410 | speed_mhz); |
411 | } | |
412 | ||
1da177e4 LT |
413 | if (latency < pc.bits.sgtc) |
414 | latency = pc.bits.sgtc; | |
415 | ||
416 | if (speed < minimum_speed) | |
417 | minimum_speed = speed; | |
418 | if (speed > maximum_speed) | |
419 | maximum_speed = speed; | |
420 | } | |
421 | ||
422 | powernow_table[i].frequency = CPUFREQ_TABLE_END; | |
423 | powernow_table[i].index = 0; | |
424 | ||
425 | /* notify BIOS that we exist */ | |
426 | acpi_processor_notify_smm(THIS_MODULE); | |
427 | ||
428 | return 0; | |
429 | ||
430 | err2: | |
431 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
432 | err1: | |
2fdf66b4 RR |
433 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
434 | err05: | |
1da177e4 LT |
435 | kfree(acpi_processor_perf); |
436 | err0: | |
b9e7638a DJ |
437 | printk(KERN_WARNING PFX "ACPI perflib can not be used on " |
438 | "this platform\n"); | |
1da177e4 LT |
439 | acpi_processor_perf = NULL; |
440 | return retval; | |
441 | } | |
442 | #else | |
443 | static int powernow_acpi_init(void) | |
444 | { | |
445 | printk(KERN_INFO PFX "no support for ACPI processor found." | |
446 | " Please recompile your kernel with ACPI processor\n"); | |
447 | return -EINVAL; | |
448 | } | |
449 | #endif | |
450 | ||
b9e7638a DJ |
451 | static void print_pst_entry(struct pst_s *pst, unsigned int j) |
452 | { | |
2d06d8c4 DB |
453 | pr_debug("PST:%d (@%p)\n", j, pst); |
454 | pr_debug(" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n", | |
b9e7638a DJ |
455 | pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid); |
456 | } | |
457 | ||
458 | static int powernow_decode_bios(int maxfid, int startvid) | |
1da177e4 LT |
459 | { |
460 | struct psb_s *psb; | |
461 | struct pst_s *pst; | |
462 | unsigned int i, j; | |
463 | unsigned char *p; | |
464 | unsigned int etuple; | |
465 | unsigned int ret; | |
466 | ||
467 | etuple = cpuid_eax(0x80000001); | |
468 | ||
b9e7638a | 469 | for (i = 0xC0000; i < 0xffff0 ; i += 16) { |
1da177e4 LT |
470 | |
471 | p = phys_to_virt(i); | |
472 | ||
b9e7638a | 473 | if (memcmp(p, "AMDK7PNOW!", 10) == 0) { |
2d06d8c4 | 474 | pr_debug("Found PSB header at %p\n", p); |
1da177e4 | 475 | psb = (struct psb_s *) p; |
2d06d8c4 | 476 | pr_debug("Table version: 0x%x\n", psb->tableversion); |
1da177e4 | 477 | if (psb->tableversion != 0x12) { |
b9e7638a DJ |
478 | printk(KERN_INFO PFX "Sorry, only v1.2 tables" |
479 | " supported right now\n"); | |
1da177e4 LT |
480 | return -ENODEV; |
481 | } | |
482 | ||
2d06d8c4 | 483 | pr_debug("Flags: 0x%x\n", psb->flags); |
b9e7638a | 484 | if ((psb->flags & 1) == 0) |
2d06d8c4 | 485 | pr_debug("Mobile voltage regulator\n"); |
b9e7638a | 486 | else |
2d06d8c4 | 487 | pr_debug("Desktop voltage regulator\n"); |
1da177e4 LT |
488 | |
489 | latency = psb->settlingtime; | |
490 | if (latency < 100) { | |
b9e7638a DJ |
491 | printk(KERN_INFO PFX "BIOS set settling time " |
492 | "to %d microseconds. " | |
493 | "Should be at least 100. " | |
494 | "Correcting.\n", latency); | |
1da177e4 LT |
495 | latency = 100; |
496 | } | |
2d06d8c4 | 497 | pr_debug("Settling Time: %d microseconds.\n", |
b9e7638a | 498 | psb->settlingtime); |
2d06d8c4 | 499 | pr_debug("Has %d PST tables. (Only dumping ones " |
b9e7638a DJ |
500 | "relevant to this CPU).\n", |
501 | psb->numpst); | |
1da177e4 | 502 | |
b9e7638a | 503 | p += sizeof(struct psb_s); |
1da177e4 LT |
504 | |
505 | pst = (struct pst_s *) p; | |
506 | ||
b9e7638a | 507 | for (j = 0; j < psb->numpst; j++) { |
1da177e4 LT |
508 | pst = (struct pst_s *) p; |
509 | number_scales = pst->numpstates; | |
510 | ||
b9e7638a DJ |
511 | if ((etuple == pst->cpuid) && |
512 | check_fsb(pst->fsbspeed) && | |
513 | (maxfid == pst->maxfid) && | |
514 | (startvid == pst->startvid)) { | |
515 | print_pst_entry(pst, j); | |
516 | p = (char *)pst + sizeof(struct pst_s); | |
517 | ret = get_ranges(p); | |
1da177e4 | 518 | return ret; |
1da177e4 | 519 | } else { |
8cbe0169 | 520 | unsigned int k; |
b9e7638a DJ |
521 | p = (char *)pst + sizeof(struct pst_s); |
522 | for (k = 0; k < number_scales; k++) | |
523 | p += 2; | |
1da177e4 LT |
524 | } |
525 | } | |
b9e7638a DJ |
526 | printk(KERN_INFO PFX "No PST tables match this cpuid " |
527 | "(0x%x)\n", etuple); | |
528 | printk(KERN_INFO PFX "This is indicative of a broken " | |
529 | "BIOS.\n"); | |
1da177e4 LT |
530 | |
531 | return -EINVAL; | |
532 | } | |
533 | p++; | |
534 | } | |
535 | ||
536 | return -ENODEV; | |
537 | } | |
538 | ||
539 | ||
b9e7638a | 540 | static int powernow_target(struct cpufreq_policy *policy, |
1da177e4 LT |
541 | unsigned int target_freq, |
542 | unsigned int relation) | |
543 | { | |
544 | unsigned int newstate; | |
545 | ||
b9e7638a DJ |
546 | if (cpufreq_frequency_table_target(policy, powernow_table, target_freq, |
547 | relation, &newstate)) | |
1da177e4 LT |
548 | return -EINVAL; |
549 | ||
550 | change_speed(newstate); | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
555 | ||
b9e7638a | 556 | static int powernow_verify(struct cpufreq_policy *policy) |
1da177e4 LT |
557 | { |
558 | return cpufreq_frequency_table_verify(policy, powernow_table); | |
559 | } | |
560 | ||
561 | /* | |
562 | * We use the fact that the bus frequency is somehow | |
563 | * a multiple of 100000/3 khz, then we compute sgtc according | |
564 | * to this multiple. | |
565 | * That way, we match more how AMD thinks all of that work. | |
566 | * We will then get the same kind of behaviour already tested under | |
567 | * the "well-known" other OS. | |
568 | */ | |
307069cf | 569 | static int __cpuinit fixup_sgtc(void) |
1da177e4 LT |
570 | { |
571 | unsigned int sgtc; | |
572 | unsigned int m; | |
573 | ||
574 | m = fsb / 3333; | |
575 | if ((m % 10) >= 5) | |
576 | m += 5; | |
577 | ||
578 | m /= 10; | |
579 | ||
580 | sgtc = 100 * m * latency; | |
581 | sgtc = sgtc / 3; | |
582 | if (sgtc > 0xfffff) { | |
583 | printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc); | |
584 | sgtc = 0xfffff; | |
585 | } | |
586 | return sgtc; | |
587 | } | |
588 | ||
589 | static unsigned int powernow_get(unsigned int cpu) | |
590 | { | |
591 | union msr_fidvidstatus fidvidstatus; | |
592 | unsigned int cfid; | |
593 | ||
594 | if (cpu) | |
595 | return 0; | |
b9e7638a | 596 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 LT |
597 | cfid = fidvidstatus.bits.CFID; |
598 | ||
b9e7638a | 599 | return fsb * fid_codes[cfid] / 10; |
1da177e4 LT |
600 | } |
601 | ||
602 | ||
307069cf | 603 | static int __cpuinit acer_cpufreq_pst(const struct dmi_system_id *d) |
1da177e4 | 604 | { |
b9e7638a DJ |
605 | printk(KERN_WARNING PFX |
606 | "%s laptop with broken PST tables in BIOS detected.\n", | |
607 | d->ident); | |
608 | printk(KERN_WARNING PFX | |
609 | "You need to downgrade to 3A21 (09/09/2002), or try a newer " | |
610 | "BIOS than 3A71 (01/20/2003)\n"); | |
611 | printk(KERN_WARNING PFX | |
612 | "cpufreq scaling has been disabled as a result of this.\n"); | |
1da177e4 LT |
613 | return 0; |
614 | } | |
615 | ||
616 | /* | |
617 | * Some Athlon laptops have really fucked PST tables. | |
618 | * A BIOS update is all that can save them. | |
619 | * Mention this, and disable cpufreq. | |
620 | */ | |
307069cf | 621 | static struct dmi_system_id __cpuinitdata powernow_dmi_table[] = { |
1da177e4 LT |
622 | { |
623 | .callback = acer_cpufreq_pst, | |
624 | .ident = "Acer Aspire", | |
625 | .matches = { | |
626 | DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"), | |
627 | DMI_MATCH(DMI_BIOS_VERSION, "3A71"), | |
628 | }, | |
629 | }, | |
630 | { } | |
631 | }; | |
632 | ||
307069cf | 633 | static int __cpuinit powernow_cpu_init(struct cpufreq_policy *policy) |
1da177e4 LT |
634 | { |
635 | union msr_fidvidstatus fidvidstatus; | |
636 | int result; | |
637 | ||
638 | if (policy->cpu != 0) | |
639 | return -ENODEV; | |
640 | ||
b9e7638a | 641 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 | 642 | |
436fe7b8 | 643 | recalibrate_cpu_khz(); |
91350ed4 DJ |
644 | |
645 | fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID]; | |
1da177e4 LT |
646 | if (!fsb) { |
647 | printk(KERN_WARNING PFX "can not determine bus frequency\n"); | |
648 | return -EINVAL; | |
649 | } | |
2d06d8c4 | 650 | pr_debug("FSB: %3dMHz\n", fsb/1000); |
1da177e4 LT |
651 | |
652 | if (dmi_check_system(powernow_dmi_table) || acpi_force) { | |
b9e7638a DJ |
653 | printk(KERN_INFO PFX "PSB/PST known to be broken. " |
654 | "Trying ACPI instead\n"); | |
1da177e4 LT |
655 | result = powernow_acpi_init(); |
656 | } else { | |
b9e7638a DJ |
657 | result = powernow_decode_bios(fidvidstatus.bits.MFID, |
658 | fidvidstatus.bits.SVID); | |
1da177e4 | 659 | if (result) { |
b9e7638a | 660 | printk(KERN_INFO PFX "Trying ACPI perflib\n"); |
1da177e4 LT |
661 | maximum_speed = 0; |
662 | minimum_speed = -1; | |
663 | latency = 0; | |
664 | result = powernow_acpi_init(); | |
665 | if (result) { | |
b9e7638a DJ |
666 | printk(KERN_INFO PFX |
667 | "ACPI and legacy methods failed\n"); | |
1da177e4 LT |
668 | } |
669 | } else { | |
670 | /* SGTC use the bus clock as timer */ | |
671 | latency = fixup_sgtc(); | |
672 | printk(KERN_INFO PFX "SGTC: %d\n", latency); | |
673 | } | |
674 | } | |
675 | ||
676 | if (result) | |
677 | return result; | |
678 | ||
b9e7638a | 679 | printk(KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n", |
1da177e4 LT |
680 | minimum_speed/1000, maximum_speed/1000); |
681 | ||
b9e7638a DJ |
682 | policy->cpuinfo.transition_latency = |
683 | cpufreq_scale(2000000UL, fsb, latency); | |
1da177e4 LT |
684 | |
685 | policy->cur = powernow_get(0); | |
686 | ||
687 | cpufreq_frequency_table_get_attr(powernow_table, policy->cpu); | |
688 | ||
689 | return cpufreq_frequency_table_cpuinfo(policy, powernow_table); | |
690 | } | |
691 | ||
b9e7638a DJ |
692 | static int powernow_cpu_exit(struct cpufreq_policy *policy) |
693 | { | |
1da177e4 LT |
694 | cpufreq_frequency_table_put_attr(policy->cpu); |
695 | ||
696 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
697 | if (acpi_processor_perf) { | |
698 | acpi_processor_unregister_performance(acpi_processor_perf, 0); | |
2fdf66b4 | 699 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
1da177e4 LT |
700 | kfree(acpi_processor_perf); |
701 | } | |
702 | #endif | |
703 | ||
4ae6673e | 704 | kfree(powernow_table); |
1da177e4 LT |
705 | return 0; |
706 | } | |
707 | ||
b9e7638a | 708 | static struct freq_attr *powernow_table_attr[] = { |
1da177e4 LT |
709 | &cpufreq_freq_attr_scaling_available_freqs, |
710 | NULL, | |
711 | }; | |
712 | ||
221dee28 | 713 | static struct cpufreq_driver powernow_driver = { |
e2f74f35 TR |
714 | .verify = powernow_verify, |
715 | .target = powernow_target, | |
716 | .get = powernow_get, | |
717 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
718 | .bios_limit = acpi_processor_get_bios_limit, | |
719 | #endif | |
720 | .init = powernow_cpu_init, | |
721 | .exit = powernow_cpu_exit, | |
722 | .name = "powernow-k7", | |
723 | .owner = THIS_MODULE, | |
724 | .attr = powernow_table_attr, | |
1da177e4 LT |
725 | }; |
726 | ||
b9e7638a | 727 | static int __init powernow_init(void) |
1da177e4 | 728 | { |
b9e7638a | 729 | if (check_powernow() == 0) |
1da177e4 LT |
730 | return -ENODEV; |
731 | return cpufreq_register_driver(&powernow_driver); | |
732 | } | |
733 | ||
734 | ||
b9e7638a | 735 | static void __exit powernow_exit(void) |
1da177e4 LT |
736 | { |
737 | cpufreq_unregister_driver(&powernow_driver); | |
738 | } | |
739 | ||
740 | module_param(acpi_force, int, 0444); | |
741 | MODULE_PARM_DESC(acpi_force, "Force ACPI to be used."); | |
742 | ||
b9e7638a DJ |
743 | MODULE_AUTHOR("Dave Jones <davej@redhat.com>"); |
744 | MODULE_DESCRIPTION("Powernow driver for AMD K7 processors."); | |
745 | MODULE_LICENSE("GPL"); | |
1da177e4 LT |
746 | |
747 | late_initcall(powernow_init); | |
748 | module_exit(powernow_exit); | |
749 |