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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / arch / x86 / kernel / cpu / cpufreq / powernow-k7.c
blob916ab5a564d4eda3788dac4c796c2f0b4ca8aa32
1 /*
2 * AMD K7 Powernow driver.
3 * (C) 2003 Dave Jones on behalf of SuSE Labs.
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 *
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.
15 */
16
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>
25 #include <linux/timex.h>
26 #include <linux/io.h>
27
28 #include <asm/timer.h> /* Needed for recalibrate_cpu_khz() */
29 #include <asm/msr.h>
30 #include <asm/system.h>
31
32 #ifdef CONFIG_X86_POWERNOW_K7_ACPI
33 #include <linux/acpi.h>
34 #include <acpi/processor.h>
35 #endif
36
37 #include "powernow-k7.h"
38
39 #define PFX "powernow: "
40
41
42 struct psb_s {
43 u8 signature[10];
44 u8 tableversion;
45 u8 flags;
46 u16 settlingtime;
47 u8 reserved1;
48 u8 numpst;
49 };
50
51 struct pst_s {
52 u32 cpuid;
53 u8 fsbspeed;
54 u8 maxfid;
55 u8 startvid;
56 u8 numpstates;
57 };
58
59 #ifdef CONFIG_X86_POWERNOW_K7_ACPI
60 union powernow_acpi_control_t {
61 struct {
62 unsigned long fid:5,
63 vid:5,
64 sgtc:20,
65 res1:2;
66 } bits;
67 unsigned long val;
68 };
69 #endif
70
71 #ifdef CONFIG_CPU_FREQ_DEBUG
72 /* divide by 1000 to get VCore voltage in V. */
73 static const int mobile_vid_table[32] = {
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 };
79 #endif
80
81 /* divide by 10 to get FID. */
82 static const int fid_codes[32] = {
83 110, 115, 120, 125, 50, 55, 60, 65,
84 70, 75, 80, 85, 90, 95, 100, 105,
85 30, 190, 40, 200, 130, 135, 140, 210,
86 150, 225, 160, 165, 170, 180, -1, -1,
87 };
88
89 /* This parameter is used in order to force ACPI instead of legacy method for
90 * configuration purpose.
91 */
92
93 static int acpi_force;
94
95 static struct cpufreq_frequency_table *powernow_table;
96
97 static unsigned int can_scale_bus;
98 static unsigned int can_scale_vid;
99 static unsigned int minimum_speed = -1;
100 static unsigned int maximum_speed;
101 static unsigned int number_scales;
102 static unsigned int fsb;
103 static unsigned int latency;
104 static char have_a0;
105
106 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, \
107 "powernow-k7", msg)
108
109 static int check_fsb(unsigned int fsbspeed)
110 {
111 int delta;
112 unsigned int f = fsb / 1000;
113
114 delta = (fsbspeed > f) ? fsbspeed - f : f - fsbspeed;
115 return delta < 5;
116 }
117
118 static int check_powernow(void)
119 {
120 struct cpuinfo_x86 *c = &cpu_data(0);
121 unsigned int maxei, eax, ebx, ecx, edx;
122
123 if ((c->x86_vendor != X86_VENDOR_AMD) || (c->x86 != 6)) {
124 #ifdef MODULE
125 printk(KERN_INFO PFX "This module only works with "
126 "AMD K7 CPUs\n");
127 #endif
128 return 0;
129 }
130
131 /* Get maximum capabilities */
132 maxei = cpuid_eax(0x80000000);
133 if (maxei < 0x80000007) { /* Any powernow info ? */
134 #ifdef MODULE
135 printk(KERN_INFO PFX "No powernow capabilities detected\n");
136 #endif
137 return 0;
138 }
139
140 if ((c->x86_model == 6) && (c->x86_mask == 0)) {
141 printk(KERN_INFO PFX "K7 660[A0] core detected, "
142 "enabling errata workarounds\n");
143 have_a0 = 1;
144 }
145
146 cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
147
148 /* Check we can actually do something before we say anything.*/
149 if (!(edx & (1 << 1 | 1 << 2)))
150 return 0;
151
152 printk(KERN_INFO PFX "PowerNOW! Technology present. Can scale: ");
153
154 if (edx & 1 << 1) {
155 printk("frequency");
156 can_scale_bus = 1;
157 }
158
159 if ((edx & (1 << 1 | 1 << 2)) == 0x6)
160 printk(" and ");
161
162 if (edx & 1 << 2) {
163 printk("voltage");
164 can_scale_vid = 1;
165 }
166
167 printk(".\n");
168 return 1;
169 }
170
171 #ifdef CONFIG_X86_POWERNOW_K7_ACPI
172 static void invalidate_entry(unsigned int entry)
173 {
174 powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
175 }
176 #endif
177
178 static int get_ranges(unsigned char *pst)
179 {
180 unsigned int j;
181 unsigned int speed;
182 u8 fid, vid;
183
184 powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) *
185 (number_scales + 1)), GFP_KERNEL);
186 if (!powernow_table)
187 return -ENOMEM;
188
189 for (j = 0 ; j < number_scales; j++) {
190 fid = *pst++;
191
192 powernow_table[j].frequency = (fsb * fid_codes[fid]) / 10;
193 powernow_table[j].index = fid; /* lower 8 bits */
194
195 speed = powernow_table[j].frequency;
196
197 if ((fid_codes[fid] % 10) == 5) {
198 #ifdef CONFIG_X86_POWERNOW_K7_ACPI
199 if (have_a0 == 1)
200 invalidate_entry(j);
201 #endif
202 }
203
204 if (speed < minimum_speed)
205 minimum_speed = speed;
206 if (speed > maximum_speed)
207 maximum_speed = speed;
208
209 vid = *pst++;
210 powernow_table[j].index |= (vid << 8); /* upper 8 bits */
211
212 dprintk(" FID: 0x%x (%d.%dx [%dMHz]) "
213 "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10,
214 fid_codes[fid] % 10, speed/1000, vid,
215 mobile_vid_table[vid]/1000,
216 mobile_vid_table[vid]%1000);
217 }
218 powernow_table[number_scales].frequency = CPUFREQ_TABLE_END;
219 powernow_table[number_scales].index = 0;
220
221 return 0;
222 }
223
224
225 static void change_FID(int fid)
226 {
227 union msr_fidvidctl fidvidctl;
228
229 rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
230 if (fidvidctl.bits.FID != fid) {
231 fidvidctl.bits.SGTC = latency;
232 fidvidctl.bits.FID = fid;
233 fidvidctl.bits.VIDC = 0;
234 fidvidctl.bits.FIDC = 1;
235 wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
236 }
237 }
238
239
240 static void change_VID(int vid)
241 {
242 union msr_fidvidctl fidvidctl;
243
244 rdmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
245 if (fidvidctl.bits.VID != vid) {
246 fidvidctl.bits.SGTC = latency;
247 fidvidctl.bits.VID = vid;
248 fidvidctl.bits.FIDC = 0;
249 fidvidctl.bits.VIDC = 1;
250 wrmsrl(MSR_K7_FID_VID_CTL, fidvidctl.val);
251 }
252 }
253
254
255 static void change_speed(unsigned int index)
256 {
257 u8 fid, vid;
258 struct cpufreq_freqs freqs;
259 union msr_fidvidstatus fidvidstatus;
260 int cfid;
261
262 /* fid are the lower 8 bits of the index we stored into
263 * the cpufreq frequency table in powernow_decode_bios,
264 * vid are the upper 8 bits.
265 */
266
267 fid = powernow_table[index].index & 0xFF;
268 vid = (powernow_table[index].index & 0xFF00) >> 8;
269
270 freqs.cpu = 0;
271
272 rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val);
273 cfid = fidvidstatus.bits.CFID;
274 freqs.old = fsb * fid_codes[cfid] / 10;
275
276 freqs.new = powernow_table[index].frequency;
277
278 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
279
280 /* Now do the magic poking into the MSRs. */
281
282 if (have_a0 == 1) /* A0 errata 5 */
283 local_irq_disable();
284
285 if (freqs.old > freqs.new) {
286 /* Going down, so change FID first */
287 change_FID(fid);
288 change_VID(vid);
289 } else {
290 /* Going up, so change VID first */
291 change_VID(vid);
292 change_FID(fid);
293 }
294
295
296 if (have_a0 == 1)
297 local_irq_enable();
298
299 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
300 }
301
302
303 #ifdef CONFIG_X86_POWERNOW_K7_ACPI
304
305 static struct acpi_processor_performance *acpi_processor_perf;
306
307 static int powernow_acpi_init(void)
308 {
309 int i;
310 int retval = 0;
311 union powernow_acpi_control_t pc;
312
313 if (acpi_processor_perf != NULL && powernow_table != NULL) {
314 retval = -EINVAL;
315 goto err0;
316 }
317
318 acpi_processor_perf = kzalloc(sizeof(struct acpi_processor_performance),
319 GFP_KERNEL);
320 if (!acpi_processor_perf) {
321 retval = -ENOMEM;
322 goto err0;
323 }
324
325 if (!zalloc_cpumask_var(&acpi_processor_perf->shared_cpu_map,
326 GFP_KERNEL)) {
327 retval = -ENOMEM;
328 goto err05;
329 }
330
331 if (acpi_processor_register_performance(acpi_processor_perf, 0)) {
332 retval = -EIO;
333 goto err1;
334 }
335
336 if (acpi_processor_perf->control_register.space_id !=
337 ACPI_ADR_SPACE_FIXED_HARDWARE) {
338 retval = -ENODEV;
339 goto err2;
340 }
341
342 if (acpi_processor_perf->status_register.space_id !=
343 ACPI_ADR_SPACE_FIXED_HARDWARE) {
344 retval = -ENODEV;
345 goto err2;
346 }
347
348 number_scales = acpi_processor_perf->state_count;
349
350 if (number_scales < 2) {
351 retval = -ENODEV;
352 goto err2;
353 }
354
355 powernow_table = kzalloc((sizeof(struct cpufreq_frequency_table) *
356 (number_scales + 1)), GFP_KERNEL);
357 if (!powernow_table) {
358 retval = -ENOMEM;
359 goto err2;
360 }
361
362 pc.val = (unsigned long) acpi_processor_perf->states[0].control;
363 for (i = 0; i < number_scales; i++) {
364 u8 fid, vid;
365 struct acpi_processor_px *state =
366 &acpi_processor_perf->states[i];
367 unsigned int speed, speed_mhz;
368
369 pc.val = (unsigned long) state->control;
370 dprintk("acpi: P%d: %d MHz %d mW %d uS control %08x SGTC %d\n",
371 i,
372 (u32) state->core_frequency,
373 (u32) state->power,
374 (u32) state->transition_latency,
375 (u32) state->control,
376 pc.bits.sgtc);
377
378 vid = pc.bits.vid;
379 fid = pc.bits.fid;
380
381 powernow_table[i].frequency = fsb * fid_codes[fid] / 10;
382 powernow_table[i].index = fid; /* lower 8 bits */
383 powernow_table[i].index |= (vid << 8); /* upper 8 bits */
384
385 speed = powernow_table[i].frequency;
386 speed_mhz = speed / 1000;
387
388 /* processor_perflib will multiply the MHz value by 1000 to
389 * get a KHz value (e.g. 1266000). However, powernow-k7 works
390 * with true KHz values (e.g. 1266768). To ensure that all
391 * powernow frequencies are available, we must ensure that
392 * ACPI doesn't restrict them, so we round up the MHz value
393 * to ensure that perflib's computed KHz value is greater than
394 * or equal to powernow's KHz value.
395 */
396 if (speed % 1000 > 0)
397 speed_mhz++;
398
399 if ((fid_codes[fid] % 10) == 5) {
400 if (have_a0 == 1)
401 invalidate_entry(i);
402 }
403
404 dprintk(" FID: 0x%x (%d.%dx [%dMHz]) "
405 "VID: 0x%x (%d.%03dV)\n", fid, fid_codes[fid] / 10,
406 fid_codes[fid] % 10, speed_mhz, vid,
407 mobile_vid_table[vid]/1000,
408 mobile_vid_table[vid]%1000);
409
410 if (state->core_frequency != speed_mhz) {
411 state->core_frequency = speed_mhz;
412 dprintk(" Corrected ACPI frequency to %d\n",
413 speed_mhz);
414 }
415
416 if (latency < pc.bits.sgtc)
417 latency = pc.bits.sgtc;
418
419 if (speed < minimum_speed)
420 minimum_speed = speed;
421 if (speed > maximum_speed)
422 maximum_speed = speed;
423 }
424
425 powernow_table[i].frequency = CPUFREQ_TABLE_END;
426 powernow_table[i].index = 0;
427
428 /* notify BIOS that we exist */
429 acpi_processor_notify_smm(THIS_MODULE);
430
431 return 0;
432
433 err2:
434 acpi_processor_unregister_performance(acpi_processor_perf, 0);
435 err1:
436 free_cpumask_var(acpi_processor_perf->shared_cpu_map);
437 err05:
438 kfree(acpi_processor_perf);
439 err0:
440 printk(KERN_WARNING PFX "ACPI perflib can not be used on "
441 "this platform\n");
442 acpi_processor_perf = NULL;
443 return retval;
444 }
445 #else
446 static int powernow_acpi_init(void)
447 {
448 printk(KERN_INFO PFX "no support for ACPI processor found."
449 " Please recompile your kernel with ACPI processor\n");
450 return -EINVAL;
451 }
452 #endif
453
454 static void print_pst_entry(struct pst_s *pst, unsigned int j)
455 {
456 dprintk("PST:%d (@%p)\n", j, pst);
457 dprintk(" cpuid: 0x%x fsb: %d maxFID: 0x%x startvid: 0x%x\n",
458 pst->cpuid, pst->fsbspeed, pst->maxfid, pst->startvid);
459 }
460
461 static int powernow_decode_bios(int maxfid, int startvid)
462 {
463 struct psb_s *psb;
464 struct pst_s *pst;
465 unsigned int i, j;
466 unsigned char *p;
467 unsigned int etuple;
468 unsigned int ret;
469
470 etuple = cpuid_eax(0x80000001);
471
472 for (i = 0xC0000; i < 0xffff0 ; i += 16) {
473
474 p = phys_to_virt(i);
475
476 if (memcmp(p, "AMDK7PNOW!", 10) == 0) {
477 dprintk("Found PSB header at %p\n", p);
478 psb = (struct psb_s *) p;
479 dprintk("Table version: 0x%x\n", psb->tableversion);
480 if (psb->tableversion != 0x12) {
481 printk(KERN_INFO PFX "Sorry, only v1.2 tables"
482 " supported right now\n");
483 return -ENODEV;
484 }
485
486 dprintk("Flags: 0x%x\n", psb->flags);
487 if ((psb->flags & 1) == 0)
488 dprintk("Mobile voltage regulator\n");
489 else
490 dprintk("Desktop voltage regulator\n");
491
492 latency = psb->settlingtime;
493 if (latency < 100) {
494 printk(KERN_INFO PFX "BIOS set settling time "
495 "to %d microseconds. "
496 "Should be at least 100. "
497 "Correcting.\n", latency);
498 latency = 100;
499 }
500 dprintk("Settling Time: %d microseconds.\n",
501 psb->settlingtime);
502 dprintk("Has %d PST tables. (Only dumping ones "
503 "relevant to this CPU).\n",
504 psb->numpst);
505
506 p += sizeof(struct psb_s);
507
508 pst = (struct pst_s *) p;
509
510 for (j = 0; j < psb->numpst; j++) {
511 pst = (struct pst_s *) p;
512 number_scales = pst->numpstates;
513
514 if ((etuple == pst->cpuid) &&
515 check_fsb(pst->fsbspeed) &&
516 (maxfid == pst->maxfid) &&
517 (startvid == pst->startvid)) {
518 print_pst_entry(pst, j);
519 p = (char *)pst + sizeof(struct pst_s);
520 ret = get_ranges(p);
521 return ret;
522 } else {
523 unsigned int k;
524 p = (char *)pst + sizeof(struct pst_s);
525 for (k = 0; k < number_scales; k++)
526 p += 2;
527 }
528 }
529 printk(KERN_INFO PFX "No PST tables match this cpuid "
530 "(0x%x)\n", etuple);
531 printk(KERN_INFO PFX "This is indicative of a broken "
532 "BIOS.\n");
533
534 return -EINVAL;
535 }
536 p++;
537 }
538
539 return -ENODEV;
540 }
541
542
543 static int powernow_target(struct cpufreq_policy *policy,
544 unsigned int target_freq,
545 unsigned int relation)
546 {
547 unsigned int newstate;
548
549 if (cpufreq_frequency_table_target(policy, powernow_table, target_freq,
550 relation, &newstate))
551 return -EINVAL;
552
553 change_speed(newstate);
554
555 return 0;
556 }
557
558
559 static int powernow_verify(struct cpufreq_policy *policy)
560 {
561 return cpufreq_frequency_table_verify(policy, powernow_table);
562 }
563
564 /*
565 * We use the fact that the bus frequency is somehow
566 * a multiple of 100000/3 khz, then we compute sgtc according
567 * to this multiple.
568 * That way, we match more how AMD thinks all of that work.
569 * We will then get the same kind of behaviour already tested under
570 * the "well-known" other OS.
571 */
572 static int __cpuinit fixup_sgtc(void)
573 {
574 unsigned int sgtc;
575 unsigned int m;
576
577 m = fsb / 3333;
578 if ((m % 10) >= 5)
579 m += 5;
580
581 m /= 10;
582
583 sgtc = 100 * m * latency;
584 sgtc = sgtc / 3;
585 if (sgtc > 0xfffff) {
586 printk(KERN_WARNING PFX "SGTC too large %d\n", sgtc);
587 sgtc = 0xfffff;
588 }
589 return sgtc;
590 }
591
592 static unsigned int powernow_get(unsigned int cpu)
593 {
594 union msr_fidvidstatus fidvidstatus;
595 unsigned int cfid;
596
597 if (cpu)
598 return 0;
599 rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val);
600 cfid = fidvidstatus.bits.CFID;
601
602 return fsb * fid_codes[cfid] / 10;
603 }
604
605
606 static int __cpuinit acer_cpufreq_pst(const struct dmi_system_id *d)
607 {
608 printk(KERN_WARNING PFX
609 "%s laptop with broken PST tables in BIOS detected.\n",
610 d->ident);
611 printk(KERN_WARNING PFX
612 "You need to downgrade to 3A21 (09/09/2002), or try a newer "
613 "BIOS than 3A71 (01/20/2003)\n");
614 printk(KERN_WARNING PFX
615 "cpufreq scaling has been disabled as a result of this.\n");
616 return 0;
617 }
618
619 /*
620 * Some Athlon laptops have really fucked PST tables.
621 * A BIOS update is all that can save them.
622 * Mention this, and disable cpufreq.
623 */
624 static struct dmi_system_id __cpuinitdata powernow_dmi_table[] = {
625 {
626 .callback = acer_cpufreq_pst,
627 .ident = "Acer Aspire",
628 .matches = {
629 DMI_MATCH(DMI_SYS_VENDOR, "Insyde Software"),
630 DMI_MATCH(DMI_BIOS_VERSION, "3A71"),
631 },
632 },
633 { }
634 };
635
636 static int __cpuinit powernow_cpu_init(struct cpufreq_policy *policy)
637 {
638 union msr_fidvidstatus fidvidstatus;
639 int result;
640
641 if (policy->cpu != 0)
642 return -ENODEV;
643
644 rdmsrl(MSR_K7_FID_VID_STATUS, fidvidstatus.val);
645
646 recalibrate_cpu_khz();
647
648 fsb = (10 * cpu_khz) / fid_codes[fidvidstatus.bits.CFID];
649 if (!fsb) {
650 printk(KERN_WARNING PFX "can not determine bus frequency\n");
651 return -EINVAL;
652 }
653 dprintk("FSB: %3dMHz\n", fsb/1000);
654
655 if (dmi_check_system(powernow_dmi_table) || acpi_force) {
656 printk(KERN_INFO PFX "PSB/PST known to be broken. "
657 "Trying ACPI instead\n");
658 result = powernow_acpi_init();
659 } else {
660 result = powernow_decode_bios(fidvidstatus.bits.MFID,
661 fidvidstatus.bits.SVID);
662 if (result) {
663 printk(KERN_INFO PFX "Trying ACPI perflib\n");
664 maximum_speed = 0;
665 minimum_speed = -1;
666 latency = 0;
667 result = powernow_acpi_init();
668 if (result) {
669 printk(KERN_INFO PFX
670 "ACPI and legacy methods failed\n");
671 }
672 } else {
673 /* SGTC use the bus clock as timer */
674 latency = fixup_sgtc();
675 printk(KERN_INFO PFX "SGTC: %d\n", latency);
676 }
677 }
678
679 if (result)
680 return result;
681
682 printk(KERN_INFO PFX "Minimum speed %d MHz. Maximum speed %d MHz.\n",
683 minimum_speed/1000, maximum_speed/1000);
684
685 policy->cpuinfo.transition_latency =
686 cpufreq_scale(2000000UL, fsb, latency);
687
688 policy->cur = powernow_get(0);
689
690 cpufreq_frequency_table_get_attr(powernow_table, policy->cpu);
691
692 return cpufreq_frequency_table_cpuinfo(policy, powernow_table);
693 }
694
695 static int powernow_cpu_exit(struct cpufreq_policy *policy)
696 {
697 cpufreq_frequency_table_put_attr(policy->cpu);
698
699 #ifdef CONFIG_X86_POWERNOW_K7_ACPI
700 if (acpi_processor_perf) {
701 acpi_processor_unregister_performance(acpi_processor_perf, 0);
702 free_cpumask_var(acpi_processor_perf->shared_cpu_map);
703 kfree(acpi_processor_perf);
704 }
705 #endif
706
707 kfree(powernow_table);
708 return 0;
709 }
710
711 static struct freq_attr *powernow_table_attr[] = {
712 &cpufreq_freq_attr_scaling_available_freqs,
713 NULL,
714 };
715
716 static struct cpufreq_driver powernow_driver = {
717 .verify = powernow_verify,
718 .target = powernow_target,
719 .get = powernow_get,
720 #ifdef CONFIG_X86_POWERNOW_K7_ACPI
721 .bios_limit = acpi_processor_get_bios_limit,
722 #endif
723 .init = powernow_cpu_init,
724 .exit = powernow_cpu_exit,
725 .name = "powernow-k7",
726 .owner = THIS_MODULE,
727 .attr = powernow_table_attr,
728 };
729
730 static int __init powernow_init(void)
731 {
732 if (check_powernow() == 0)
733 return -ENODEV;
734 return cpufreq_register_driver(&powernow_driver);
735 }
736
737
738 static void __exit powernow_exit(void)
739 {
740 cpufreq_unregister_driver(&powernow_driver);
741 }
742
743 module_param(acpi_force, int, 0444);
744 MODULE_PARM_DESC(acpi_force, "Force ACPI to be used.");
745
746 MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
747 MODULE_DESCRIPTION("Powernow driver for AMD K7 processors.");
748 MODULE_LICENSE("GPL");
749
750 late_initcall(powernow_init);
751 module_exit(powernow_exit);
Tomato firmware and modifications.