Commit | Line | Data |
---|---|---|
4f19048f | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * AMD K7 Powernow driver. | |
f4432c5c | 4 | * (C) 2003 Dave Jones on behalf of SuSE Labs. |
1da177e4 | 5 | * |
1da177e4 LT |
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 | ||
1c5864e2 JP |
16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
17 | ||
1da177e4 LT |
18 | #include <linux/kernel.h> |
19 | #include <linux/module.h> | |
20 | #include <linux/moduleparam.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/cpufreq.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/dmi.h> | |
b9e7638a DJ |
26 | #include <linux/timex.h> |
27 | #include <linux/io.h> | |
1da177e4 | 28 | |
b9e7638a | 29 | #include <asm/timer.h> /* Needed for recalibrate_cpu_khz() */ |
1da177e4 | 30 | #include <asm/msr.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 | ||
1da177e4 LT |
40 | struct psb_s { |
41 | u8 signature[10]; | |
42 | u8 tableversion; | |
43 | u8 flags; | |
44 | u16 settlingtime; | |
45 | u8 reserved1; | |
46 | u8 numpst; | |
47 | }; | |
48 | ||
49 | struct pst_s { | |
50 | u32 cpuid; | |
51 | u8 fsbspeed; | |
52 | u8 maxfid; | |
53 | u8 startvid; | |
54 | u8 numpstates; | |
55 | }; | |
56 | ||
57 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
58 | union powernow_acpi_control_t { | |
59 | struct { | |
60 | unsigned long fid:5, | |
b9e7638a DJ |
61 | vid:5, |
62 | sgtc:20, | |
63 | res1:2; | |
1da177e4 LT |
64 | } bits; |
65 | unsigned long val; | |
66 | }; | |
67 | #endif | |
68 | ||
1da177e4 | 69 | /* divide by 1000 to get VCore voltage in V. */ |
bd5ab26a | 70 | static const int mobile_vid_table[32] = { |
1da177e4 LT |
71 | 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650, |
72 | 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0, | |
73 | 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100, | |
74 | 1075, 1050, 1025, 1000, 975, 950, 925, 0, | |
75 | }; | |
1da177e4 LT |
76 | |
77 | /* divide by 10 to get FID. */ | |
bd5ab26a | 78 | static const int fid_codes[32] = { |
1da177e4 LT |
79 | 110, 115, 120, 125, 50, 55, 60, 65, |
80 | 70, 75, 80, 85, 90, 95, 100, 105, | |
81 | 30, 190, 40, 200, 130, 135, 140, 210, | |
82 | 150, 225, 160, 165, 170, 180, -1, -1, | |
83 | }; | |
84 | ||
85 | /* This parameter is used in order to force ACPI instead of legacy method for | |
86 | * configuration purpose. | |
87 | */ | |
88 | ||
89 | static int acpi_force; | |
90 | ||
91 | static struct cpufreq_frequency_table *powernow_table; | |
92 | ||
93 | static unsigned int can_scale_bus; | |
94 | static unsigned int can_scale_vid; | |
fff78ad5 | 95 | static unsigned int minimum_speed = -1; |
1da177e4 LT |
96 | static unsigned int maximum_speed; |
97 | static unsigned int number_scales; | |
98 | static unsigned int fsb; | |
99 | static unsigned int latency; | |
100 | static char have_a0; | |
101 | ||
1da177e4 LT |
102 | static int check_fsb(unsigned int fsbspeed) |
103 | { | |
104 | int delta; | |
105 | unsigned int f = fsb / 1000; | |
106 | ||
107 | delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed; | |
b9e7638a | 108 | return delta < 5; |
1da177e4 LT |
109 | } |
110 | ||
fa8031ae | 111 | static const struct x86_cpu_id powernow_k7_cpuids[] = { |
30bcfff9 | 112 | { X86_VENDOR_AMD, 6, }, |
fa8031ae AK |
113 | {} |
114 | }; | |
115 | MODULE_DEVICE_TABLE(x86cpu, powernow_k7_cpuids); | |
116 | ||
1da177e4 LT |
117 | static int check_powernow(void) |
118 | { | |
92cb7612 | 119 | struct cpuinfo_x86 *c = &cpu_data(0); |
1da177e4 LT |
120 | unsigned int maxei, eax, ebx, ecx, edx; |
121 | ||
fa8031ae | 122 | if (!x86_match_cpu(powernow_k7_cpuids)) |
1da177e4 | 123 | return 0; |
1da177e4 LT |
124 | |
125 | /* Get maximum capabilities */ | |
b9e7638a | 126 | maxei = cpuid_eax(0x80000000); |
1da177e4 LT |
127 | if (maxei < 0x80000007) { /* Any powernow info ? */ |
128 | #ifdef MODULE | |
1c5864e2 | 129 | pr_info("No powernow capabilities detected\n"); |
1da177e4 LT |
130 | #endif |
131 | return 0; | |
132 | } | |
133 | ||
b399151c | 134 | if ((c->x86_model == 6) && (c->x86_stepping == 0)) { |
1c5864e2 | 135 | pr_info("K7 660[A0] core detected, enabling errata workarounds\n"); |
1da177e4 LT |
136 | have_a0 = 1; |
137 | } | |
138 | ||
139 | cpuid(0x80000007, &eax, &ebx, &ecx, &edx); | |
140 | ||
141 | /* Check we can actually do something before we say anything.*/ | |
142 | if (!(edx & (1 << 1 | 1 << 2))) | |
143 | return 0; | |
144 | ||
1c5864e2 | 145 | pr_info("PowerNOW! Technology present. Can scale: "); |
1da177e4 LT |
146 | |
147 | if (edx & 1 << 1) { | |
b49c22a6 | 148 | pr_cont("frequency"); |
b9e7638a | 149 | can_scale_bus = 1; |
1da177e4 LT |
150 | } |
151 | ||
152 | if ((edx & (1 << 1 | 1 << 2)) == 0x6) | |
b49c22a6 | 153 | pr_cont(" and "); |
1da177e4 LT |
154 | |
155 | if (edx & 1 << 2) { | |
b49c22a6 | 156 | pr_cont("voltage"); |
b9e7638a | 157 | can_scale_vid = 1; |
1da177e4 LT |
158 | } |
159 | ||
b49c22a6 | 160 | pr_cont("\n"); |
1da177e4 LT |
161 | return 1; |
162 | } | |
163 | ||
d38e73e8 | 164 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
b9e7638a DJ |
165 | static void invalidate_entry(unsigned int entry) |
166 | { | |
167 | powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID; | |
168 | } | |
d38e73e8 | 169 | #endif |
1da177e4 | 170 | |
b9e7638a | 171 | static int get_ranges(unsigned char *pst) |
1da177e4 LT |
172 | { |
173 | unsigned int j; | |
174 | unsigned int speed; | |
175 | u8 fid, vid; | |
176 | ||
d5b73cd8 | 177 | powernow_table = kzalloc((sizeof(*powernow_table) * |
b9e7638a | 178 | (number_scales + 1)), GFP_KERNEL); |
1da177e4 LT |
179 | if (!powernow_table) |
180 | return -ENOMEM; | |
1da177e4 | 181 | |
b9e7638a | 182 | for (j = 0 ; j < number_scales; j++) { |
1da177e4 LT |
183 | fid = *pst++; |
184 | ||
185 | powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10; | |
50701588 | 186 | powernow_table[j].driver_data = fid; /* lower 8 bits */ |
1da177e4 LT |
187 | |
188 | speed = powernow_table[j].frequency; | |
189 | ||
b9e7638a | 190 | if ((fid_codes[fid] % 10) == 5) { |
1da177e4 LT |
191 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
192 | if (have_a0 == 1) | |
b9e7638a | 193 | invalidate_entry(j); |
1da177e4 LT |
194 | #endif |
195 | } | |
196 | ||
197 | if (speed < minimum_speed) | |
198 | minimum_speed = speed; | |
199 | if (speed > maximum_speed) | |
200 | maximum_speed = speed; | |
201 | ||
202 | vid = *pst++; | |
50701588 | 203 | powernow_table[j].driver_data |= (vid << 8); /* upper 8 bits */ |
1da177e4 | 204 | |
2d06d8c4 | 205 | pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) " |
32ee8c3e DJ |
206 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
207 | fid_codes[fid] % 10, speed/1000, vid, | |
1da177e4 LT |
208 | mobile_vid_table[vid]/1000, |
209 | mobile_vid_table[vid]%1000); | |
210 | } | |
211 | powernow_table[number_scales].frequency = CPUFREQ_TABLE_END; | |
50701588 | 212 | powernow_table[number_scales].driver_data = 0; |
1da177e4 LT |
213 | |
214 | return 0; | |
215 | } | |
216 | ||
217 | ||
218 | static void change_FID(int fid) | |
219 | { | |
220 | union msr_fidvidctl fidvidctl; | |
221 | ||
b9e7638a | 222 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
223 | if (fidvidctl.bits.FID != fid) { |
224 | fidvidctl.bits.SGTC = latency; | |
225 | fidvidctl.bits.FID = fid; | |
226 | fidvidctl.bits.VIDC = 0; | |
227 | fidvidctl.bits.FIDC = 1; | |
b9e7638a | 228 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
229 | } |
230 | } | |
231 | ||
232 | ||
233 | static void change_VID(int vid) | |
234 | { | |
235 | union msr_fidvidctl fidvidctl; | |
236 | ||
b9e7638a | 237 | rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
238 | if (fidvidctl.bits.VID != vid) { |
239 | fidvidctl.bits.SGTC = latency; | |
240 | fidvidctl.bits.VID = vid; | |
241 | fidvidctl.bits.FIDC = 0; | |
242 | fidvidctl.bits.VIDC = 1; | |
b9e7638a | 243 | wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val); |
1da177e4 LT |
244 | } |
245 | } | |
246 | ||
247 | ||
9c0ebcf7 | 248 | static int powernow_target(struct cpufreq_policy *policy, unsigned int index) |
1da177e4 LT |
249 | { |
250 | u8 fid, vid; | |
251 | struct cpufreq_freqs freqs; | |
252 | union msr_fidvidstatus fidvidstatus; | |
253 | int cfid; | |
254 | ||
255 | /* fid are the lower 8 bits of the index we stored into | |
256 | * the cpufreq frequency table in powernow_decode_bios, | |
257 | * vid are the upper 8 bits. | |
258 | */ | |
259 | ||
50701588 VK |
260 | fid = powernow_table[index].driver_data & 0xFF; |
261 | vid = (powernow_table[index].driver_data & 0xFF00) >> 8; | |
1da177e4 | 262 | |
b9e7638a | 263 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 LT |
264 | cfid = fidvidstatus.bits.CFID; |
265 | freqs.old = fsb * fid_codes[cfid] / 10; | |
266 | ||
267 | freqs.new = powernow_table[index].frequency; | |
268 | ||
1da177e4 LT |
269 | /* Now do the magic poking into the MSRs. */ |
270 | ||
271 | if (have_a0 == 1) /* A0 errata 5 */ | |
272 | local_irq_disable(); | |
273 | ||
274 | if (freqs.old > freqs.new) { | |
275 | /* Going down, so change FID first */ | |
276 | change_FID(fid); | |
277 | change_VID(vid); | |
278 | } else { | |
279 | /* Going up, so change VID first */ | |
280 | change_VID(vid); | |
281 | change_FID(fid); | |
282 | } | |
283 | ||
284 | ||
285 | if (have_a0 == 1) | |
286 | local_irq_enable(); | |
287 | ||
9c0ebcf7 | 288 | return 0; |
1da177e4 LT |
289 | } |
290 | ||
291 | ||
292 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
293 | ||
294 | static struct acpi_processor_performance *acpi_processor_perf; | |
295 | ||
296 | static int powernow_acpi_init(void) | |
297 | { | |
298 | int i; | |
299 | int retval = 0; | |
300 | union powernow_acpi_control_t pc; | |
301 | ||
302 | if (acpi_processor_perf != NULL && powernow_table != NULL) { | |
303 | retval = -EINVAL; | |
304 | goto err0; | |
305 | } | |
306 | ||
d5b73cd8 | 307 | acpi_processor_perf = kzalloc(sizeof(*acpi_processor_perf), GFP_KERNEL); |
1da177e4 LT |
308 | if (!acpi_processor_perf) { |
309 | retval = -ENOMEM; | |
310 | goto err0; | |
311 | } | |
312 | ||
eaa95840 | 313 | if (!zalloc_cpumask_var(&acpi_processor_perf->shared_cpu_map, |
2fdf66b4 RR |
314 | GFP_KERNEL)) { |
315 | retval = -ENOMEM; | |
316 | goto err05; | |
317 | } | |
318 | ||
1da177e4 LT |
319 | if (acpi_processor_register_performance(acpi_processor_perf, 0)) { |
320 | retval = -EIO; | |
321 | goto err1; | |
322 | } | |
323 | ||
b9e7638a DJ |
324 | if (acpi_processor_perf->control_register.space_id != |
325 | ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
1da177e4 LT |
326 | retval = -ENODEV; |
327 | goto err2; | |
328 | } | |
329 | ||
b9e7638a DJ |
330 | if (acpi_processor_perf->status_register.space_id != |
331 | ACPI_ADR_SPACE_FIXED_HARDWARE) { | |
1da177e4 LT |
332 | retval = -ENODEV; |
333 | goto err2; | |
334 | } | |
335 | ||
336 | number_scales = acpi_processor_perf->state_count; | |
337 | ||
338 | if (number_scales < 2) { | |
339 | retval = -ENODEV; | |
340 | goto err2; | |
341 | } | |
342 | ||
d5b73cd8 | 343 | powernow_table = kzalloc((sizeof(*powernow_table) * |
b9e7638a | 344 | (number_scales + 1)), GFP_KERNEL); |
1da177e4 LT |
345 | if (!powernow_table) { |
346 | retval = -ENOMEM; | |
347 | goto err2; | |
348 | } | |
349 | ||
1da177e4 LT |
350 | pc.val = (unsigned long) acpi_processor_perf->states[0].control; |
351 | for (i = 0; i < number_scales; i++) { | |
352 | u8 fid, vid; | |
dc2585eb DD |
353 | struct acpi_processor_px *state = |
354 | &acpi_processor_perf->states[i]; | |
355 | unsigned int speed, speed_mhz; | |
1da177e4 | 356 | |
dc2585eb | 357 | pc.val = (unsigned long) state->control; |
2d06d8c4 | 358 | pr_debug("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n", |
1da177e4 | 359 | i, |
dc2585eb DD |
360 | (u32) state->core_frequency, |
361 | (u32) state->power, | |
362 | (u32) state->transition_latency, | |
363 | (u32) state->control, | |
1da177e4 LT |
364 | pc.bits.sgtc); |
365 | ||
366 | vid = pc.bits.vid; | |
367 | fid = pc.bits.fid; | |
368 | ||
369 | powernow_table[i].frequency = fsb * fid_codes[fid] / 10; | |
50701588 VK |
370 | powernow_table[i].driver_data = fid; /* lower 8 bits */ |
371 | powernow_table[i].driver_data |= (vid << 8); /* upper 8 bits */ | |
1da177e4 LT |
372 | |
373 | speed = powernow_table[i].frequency; | |
dc2585eb DD |
374 | speed_mhz = speed / 1000; |
375 | ||
376 | /* processor_perflib will multiply the MHz value by 1000 to | |
377 | * get a KHz value (e.g. 1266000). However, powernow-k7 works | |
378 | * with true KHz values (e.g. 1266768). To ensure that all | |
379 | * powernow frequencies are available, we must ensure that | |
380 | * ACPI doesn't restrict them, so we round up the MHz value | |
381 | * to ensure that perflib's computed KHz value is greater than | |
382 | * or equal to powernow's KHz value. | |
383 | */ | |
384 | if (speed % 1000 > 0) | |
385 | speed_mhz++; | |
1da177e4 | 386 | |
b9e7638a | 387 | if ((fid_codes[fid] % 10) == 5) { |
1da177e4 | 388 | if (have_a0 == 1) |
b9e7638a | 389 | invalidate_entry(i); |
1da177e4 LT |
390 | } |
391 | ||
2d06d8c4 | 392 | pr_debug(" FID: 0x%x (%d.%dx [%dMHz]) " |
32ee8c3e | 393 | "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10, |
dc2585eb | 394 | fid_codes[fid] % 10, speed_mhz, vid, |
1da177e4 LT |
395 | mobile_vid_table[vid]/1000, |
396 | mobile_vid_table[vid]%1000); | |
397 | ||
dc2585eb DD |
398 | if (state->core_frequency != speed_mhz) { |
399 | state->core_frequency = speed_mhz; | |
2d06d8c4 | 400 | pr_debug(" Corrected ACPI frequency to %d\n", |
dc2585eb DD |
401 | speed_mhz); |
402 | } | |
403 | ||
1da177e4 LT |
404 | if (latency < pc.bits.sgtc) |
405 | latency = pc.bits.sgtc; | |
406 | ||
407 | if (speed < minimum_speed) | |
408 | minimum_speed = speed; | |
409 | if (speed > maximum_speed) | |
410 | maximum_speed = speed; | |
411 | } | |
412 | ||
413 | powernow_table[i].frequency = CPUFREQ_TABLE_END; | |
50701588 | 414 | powernow_table[i].driver_data = 0; |
1da177e4 LT |
415 | |
416 | /* notify BIOS that we exist */ | |
417 | acpi_processor_notify_smm(THIS_MODULE); | |
418 | ||
419 | return 0; | |
420 | ||
421 | err2: | |
b2f8dc4c | 422 | acpi_processor_unregister_performance(0); |
1da177e4 | 423 | err1: |
2fdf66b4 RR |
424 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
425 | err05: | |
1da177e4 LT |
426 | kfree(acpi_processor_perf); |
427 | err0: | |
1c5864e2 | 428 | pr_warn("ACPI perflib can not be used on this platform\n"); |
1da177e4 LT |
429 | acpi_processor_perf = NULL; |
430 | return retval; | |
431 | } | |
432 | #else | |
433 | static int powernow_acpi_init(void) | |
434 | { | |
1c5864e2 | 435 | pr_info("no support for ACPI processor found - please recompile your kernel with ACPI processor\n"); |
1da177e4 LT |
436 | return -EINVAL; |
437 | } | |
438 | #endif | |
439 | ||
b9e7638a DJ |
440 | static void print_pst_entry(struct pst_s *pst, unsigned int j) |
441 | { | |
2d06d8c4 DB |
442 | pr_debug("PST:%d (@%p)\n", j, pst); |
443 | pr_debug(" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n", | |
b9e7638a DJ |
444 | pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid); |
445 | } | |
446 | ||
447 | static int powernow_decode_bios(int maxfid, int startvid) | |
1da177e4 LT |
448 | { |
449 | struct psb_s *psb; | |
450 | struct pst_s *pst; | |
451 | unsigned int i, j; | |
452 | unsigned char *p; | |
453 | unsigned int etuple; | |
454 | unsigned int ret; | |
455 | ||
456 | etuple = cpuid_eax(0x80000001); | |
457 | ||
b9e7638a | 458 | for (i = 0xC0000; i < 0xffff0 ; i += 16) { |
1da177e4 LT |
459 | |
460 | p = phys_to_virt(i); | |
461 | ||
b9e7638a | 462 | if (memcmp(p, "AMDK7PNOW!", 10) == 0) { |
2d06d8c4 | 463 | pr_debug("Found PSB header at %p\n", p); |
1da177e4 | 464 | psb = (struct psb_s *) p; |
2d06d8c4 | 465 | pr_debug("Table version: 0x%x\n", psb->tableversion); |
1da177e4 | 466 | if (psb->tableversion != 0x12) { |
1c5864e2 | 467 | pr_info("Sorry, only v1.2 tables supported right now\n"); |
1da177e4 LT |
468 | return -ENODEV; |
469 | } | |
470 | ||
2d06d8c4 | 471 | pr_debug("Flags: 0x%x\n", psb->flags); |
b9e7638a | 472 | if ((psb->flags & 1) == 0) |
2d06d8c4 | 473 | pr_debug("Mobile voltage regulator\n"); |
b9e7638a | 474 | else |
2d06d8c4 | 475 | pr_debug("Desktop voltage regulator\n"); |
1da177e4 LT |
476 | |
477 | latency = psb->settlingtime; | |
478 | if (latency < 100) { | |
1c5864e2 | 479 | pr_info("BIOS set settling time to %d microseconds. Should be at least 100. Correcting.\n", |
b49c22a6 | 480 | latency); |
1da177e4 LT |
481 | latency = 100; |
482 | } | |
2d06d8c4 | 483 | pr_debug("Settling Time: %d microseconds.\n", |
b9e7638a | 484 | psb->settlingtime); |
2d06d8c4 | 485 | pr_debug("Has %d PST tables. (Only dumping ones " |
b9e7638a DJ |
486 | "relevant to this CPU).\n", |
487 | psb->numpst); | |
1da177e4 | 488 | |
d5b73cd8 | 489 | p += sizeof(*psb); |
1da177e4 LT |
490 | |
491 | pst = (struct pst_s *) p; | |
492 | ||
b9e7638a | 493 | for (j = 0; j < psb->numpst; j++) { |
1da177e4 LT |
494 | pst = (struct pst_s *) p; |
495 | number_scales = pst->numpstates; | |
496 | ||
b9e7638a DJ |
497 | if ((etuple == pst->cpuid) && |
498 | check_fsb(pst->fsbspeed) && | |
499 | (maxfid == pst->maxfid) && | |
500 | (startvid == pst->startvid)) { | |
501 | print_pst_entry(pst, j); | |
d5b73cd8 | 502 | p = (char *)pst + sizeof(*pst); |
b9e7638a | 503 | ret = get_ranges(p); |
1da177e4 | 504 | return ret; |
1da177e4 | 505 | } else { |
8cbe0169 | 506 | unsigned int k; |
d5b73cd8 | 507 | p = (char *)pst + sizeof(*pst); |
b9e7638a DJ |
508 | for (k = 0; k < number_scales; k++) |
509 | p += 2; | |
1da177e4 LT |
510 | } |
511 | } | |
1c5864e2 | 512 | pr_info("No PST tables match this cpuid (0x%x)\n", |
b49c22a6 | 513 | etuple); |
1c5864e2 | 514 | pr_info("This is indicative of a broken BIOS\n"); |
1da177e4 LT |
515 | |
516 | return -EINVAL; | |
517 | } | |
518 | p++; | |
519 | } | |
520 | ||
521 | return -ENODEV; | |
522 | } | |
523 | ||
524 | ||
1da177e4 LT |
525 | /* |
526 | * We use the fact that the bus frequency is somehow | |
527 | * a multiple of 100000/3 khz, then we compute sgtc according | |
528 | * to this multiple. | |
529 | * That way, we match more how AMD thinks all of that work. | |
530 | * We will then get the same kind of behaviour already tested under | |
531 | * the "well-known" other OS. | |
532 | */ | |
2760984f | 533 | static int fixup_sgtc(void) |
1da177e4 LT |
534 | { |
535 | unsigned int sgtc; | |
536 | unsigned int m; | |
537 | ||
538 | m = fsb / 3333; | |
539 | if ((m % 10) >= 5) | |
540 | m += 5; | |
541 | ||
542 | m /= 10; | |
543 | ||
544 | sgtc = 100 * m * latency; | |
545 | sgtc = sgtc / 3; | |
546 | if (sgtc > 0xfffff) { | |
1c5864e2 | 547 | pr_warn("SGTC too large %d\n", sgtc); |
1da177e4 LT |
548 | sgtc = 0xfffff; |
549 | } | |
550 | return sgtc; | |
551 | } | |
552 | ||
553 | static unsigned int powernow_get(unsigned int cpu) | |
554 | { | |
555 | union msr_fidvidstatus fidvidstatus; | |
556 | unsigned int cfid; | |
557 | ||
558 | if (cpu) | |
559 | return 0; | |
b9e7638a | 560 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 LT |
561 | cfid = fidvidstatus.bits.CFID; |
562 | ||
b9e7638a | 563 | return fsb * fid_codes[cfid] / 10; |
1da177e4 LT |
564 | } |
565 | ||
566 | ||
2760984f | 567 | static int acer_cpufreq_pst(const struct dmi_system_id *d) |
1da177e4 | 568 | { |
1c5864e2 | 569 | pr_warn("%s laptop with broken PST tables in BIOS detected\n", |
b9e7638a | 570 | d->ident); |
1c5864e2 JP |
571 | pr_warn("You need to downgrade to 3A21 (09/09/2002), or try a newer BIOS than 3A71 (01/20/2003)\n"); |
572 | pr_warn("cpufreq scaling has been disabled as a result of this\n"); | |
1da177e4 LT |
573 | return 0; |
574 | } | |
575 | ||
576 | /* | |
577 | * Some Athlon laptops have really fucked PST tables. | |
578 | * A BIOS update is all that can save them. | |
579 | * Mention this, and disable cpufreq. | |
580 | */ | |
6faadbbb | 581 | static const struct dmi_system_id powernow_dmi_table[] = { |
1da177e4 LT |
582 | { |
583 | .callback = acer_cpufreq_pst, | |
584 | .ident = "Acer Aspire", | |
585 | .matches = { | |
586 | DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"), | |
587 | DMI_MATCH(DMI_BIOS_VERSION, "3A71"), | |
588 | }, | |
589 | }, | |
590 | { } | |
591 | }; | |
592 | ||
2760984f | 593 | static int powernow_cpu_init(struct cpufreq_policy *policy) |
1da177e4 LT |
594 | { |
595 | union msr_fidvidstatus fidvidstatus; | |
596 | int result; | |
597 | ||
598 | if (policy->cpu != 0) | |
599 | return -ENODEV; | |
600 | ||
b9e7638a | 601 | rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val); |
1da177e4 | 602 | |
436fe7b8 | 603 | recalibrate_cpu_khz(); |
91350ed4 DJ |
604 | |
605 | fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID]; | |
1da177e4 | 606 | if (!fsb) { |
1c5864e2 | 607 | pr_warn("can not determine bus frequency\n"); |
1da177e4 LT |
608 | return -EINVAL; |
609 | } | |
2d06d8c4 | 610 | pr_debug("FSB: %3dMHz\n", fsb/1000); |
1da177e4 LT |
611 | |
612 | if (dmi_check_system(powernow_dmi_table) || acpi_force) { | |
1c5864e2 | 613 | pr_info("PSB/PST known to be broken - trying ACPI instead\n"); |
1da177e4 LT |
614 | result = powernow_acpi_init(); |
615 | } else { | |
b9e7638a DJ |
616 | result = powernow_decode_bios(fidvidstatus.bits.MFID, |
617 | fidvidstatus.bits.SVID); | |
1da177e4 | 618 | if (result) { |
1c5864e2 | 619 | pr_info("Trying ACPI perflib\n"); |
1da177e4 LT |
620 | maximum_speed = 0; |
621 | minimum_speed = -1; | |
622 | latency = 0; | |
623 | result = powernow_acpi_init(); | |
624 | if (result) { | |
1c5864e2 | 625 | pr_info("ACPI and legacy methods failed\n"); |
1da177e4 LT |
626 | } |
627 | } else { | |
628 | /* SGTC use the bus clock as timer */ | |
629 | latency = fixup_sgtc(); | |
1c5864e2 | 630 | pr_info("SGTC: %d\n", latency); |
1da177e4 LT |
631 | } |
632 | } | |
633 | ||
634 | if (result) | |
635 | return result; | |
636 | ||
1c5864e2 | 637 | pr_info("Minimum speed %d MHz - Maximum speed %d MHz\n", |
b49c22a6 | 638 | minimum_speed/1000, maximum_speed/1000); |
1da177e4 | 639 | |
b9e7638a DJ |
640 | policy->cpuinfo.transition_latency = |
641 | cpufreq_scale(2000000UL, fsb, latency); | |
e2376d1f | 642 | policy->freq_table = powernow_table; |
1da177e4 | 643 | |
e2376d1f | 644 | return 0; |
1da177e4 LT |
645 | } |
646 | ||
b9e7638a DJ |
647 | static int powernow_cpu_exit(struct cpufreq_policy *policy) |
648 | { | |
1da177e4 LT |
649 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI |
650 | if (acpi_processor_perf) { | |
b2f8dc4c | 651 | acpi_processor_unregister_performance(0); |
2fdf66b4 | 652 | free_cpumask_var(acpi_processor_perf->shared_cpu_map); |
1da177e4 LT |
653 | kfree(acpi_processor_perf); |
654 | } | |
655 | #endif | |
656 | ||
4ae6673e | 657 | kfree(powernow_table); |
1da177e4 LT |
658 | return 0; |
659 | } | |
660 | ||
221dee28 | 661 | static struct cpufreq_driver powernow_driver = { |
d63bd27f | 662 | .verify = cpufreq_generic_frequency_table_verify, |
9c0ebcf7 | 663 | .target_index = powernow_target, |
e2f74f35 TR |
664 | .get = powernow_get, |
665 | #ifdef CONFIG_X86_POWERNOW_K7_ACPI | |
666 | .bios_limit = acpi_processor_get_bios_limit, | |
667 | #endif | |
668 | .init = powernow_cpu_init, | |
669 | .exit = powernow_cpu_exit, | |
670 | .name = "powernow-k7", | |
d63bd27f | 671 | .attr = cpufreq_generic_attr, |
1da177e4 LT |
672 | }; |
673 | ||
b9e7638a | 674 | static int __init powernow_init(void) |
1da177e4 | 675 | { |
b9e7638a | 676 | if (check_powernow() == 0) |
1da177e4 LT |
677 | return -ENODEV; |
678 | return cpufreq_register_driver(&powernow_driver); | |
679 | } | |
680 | ||
681 | ||
b9e7638a | 682 | static void __exit powernow_exit(void) |
1da177e4 LT |
683 | { |
684 | cpufreq_unregister_driver(&powernow_driver); | |
685 | } | |
686 | ||
687 | module_param(acpi_force, int, 0444); | |
688 | MODULE_PARM_DESC(acpi_force, "Force ACPI to be used."); | |
689 | ||
d5e80b4b | 690 | MODULE_AUTHOR("Dave Jones"); |
b9e7638a DJ |
691 | MODULE_DESCRIPTION("Powernow driver for AMD K7 processors."); |
692 | MODULE_LICENSE("GPL"); | |
1da177e4 LT |
693 | |
694 | late_initcall(powernow_init); | |
695 | module_exit(powernow_exit); | |
696 |