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[CPUFREQ] constify some data tables.
[pv_ops_mirror.git] / arch / i386 / kernel / cpu / cpufreq / longhaul.c
blob8cc6952d777232c6000fe93e78dc576aac2bc541
1 /*
2 * (C) 2001-2004 Dave Jones. <davej@codemonkey.org.uk>
3 * (C) 2002 Padraig Brady. <padraig@antefacto.com>
4 *
5 * Licensed under the terms of the GNU GPL License version 2.
6 * Based upon datasheets & sample CPUs kindly provided by VIA.
7 *
8 * VIA have currently 3 different versions of Longhaul.
9 * Version 1 (Longhaul) uses the BCR2 MSR at 0x1147.
10 * It is present only in Samuel 1 (C5A), Samuel 2 (C5B) stepping 0.
11 * Version 2 of longhaul is backward compatible with v1, but adds
12 * LONGHAUL MSR for purpose of both frequency and voltage scaling.
13 * Present in Samuel 2 (steppings 1-7 only) (C5B), and Ezra (C5C).
14 * Version 3 of longhaul got renamed to Powersaver and redesigned
15 * to use only the POWERSAVER MSR at 0x110a.
16 * It is present in Ezra-T (C5M), Nehemiah (C5X) and above.
17 * It's pretty much the same feature wise to longhaul v2, though
18 * there is provision for scaling FSB too, but this doesn't work
19 * too well in practice so we don't even try to use this.
20 *
21 * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
22 */
23
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27 #include <linux/init.h>
28 #include <linux/cpufreq.h>
29 #include <linux/pci.h>
30 #include <linux/slab.h>
31 #include <linux/string.h>
32
33 #include <asm/msr.h>
34 #include <asm/timex.h>
35 #include <asm/io.h>
36 #include <asm/acpi.h>
37 #include <linux/acpi.h>
38 #include <acpi/processor.h>
39
40 #include "longhaul.h"
41
42 #define PFX "longhaul: "
43
44 #define TYPE_LONGHAUL_V1 1
45 #define TYPE_LONGHAUL_V2 2
46 #define TYPE_POWERSAVER 3
47
48 #define CPU_SAMUEL 1
49 #define CPU_SAMUEL2 2
50 #define CPU_EZRA 3
51 #define CPU_EZRA_T 4
52 #define CPU_NEHEMIAH 5
53 #define CPU_NEHEMIAH_C 6
54
55 /* Flags */
56 #define USE_ACPI_C3 (1 << 1)
57 #define USE_NORTHBRIDGE (1 << 2)
58 #define USE_VT8235 (1 << 3)
59
60 static int cpu_model;
61 static unsigned int numscales=16;
62 static unsigned int fsb;
63
64 static const struct mV_pos *vrm_mV_table;
65 static const unsigned char *mV_vrm_table;
66 struct f_msr {
67 u8 vrm;
68 u8 pos;
69 };
70 static struct f_msr f_msr_table[32];
71
72 static unsigned int highest_speed, lowest_speed; /* kHz */
73 static unsigned int minmult, maxmult;
74 static int can_scale_voltage;
75 static struct acpi_processor *pr = NULL;
76 static struct acpi_processor_cx *cx = NULL;
77 static u8 longhaul_flags;
78 static u8 longhaul_pos;
79
80 /* Module parameters */
81 static int scale_voltage;
82
83 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "longhaul", msg)
84
85
86 /* Clock ratios multiplied by 10 */
87 static int clock_ratio[32];
88 static int eblcr_table[32];
89 static int longhaul_version;
90 static struct cpufreq_frequency_table *longhaul_table;
91
92 #ifdef CONFIG_CPU_FREQ_DEBUG
93 static char speedbuffer[8];
94
95 static char *print_speed(int speed)
96 {
97 if (speed < 1000) {
98 snprintf(speedbuffer, sizeof(speedbuffer),"%dMHz", speed);
99 return speedbuffer;
100 }
101
102 if (speed%1000 == 0)
103 snprintf(speedbuffer, sizeof(speedbuffer),
104 "%dGHz", speed/1000);
105 else
106 snprintf(speedbuffer, sizeof(speedbuffer),
107 "%d.%dGHz", speed/1000, (speed%1000)/100);
108
109 return speedbuffer;
110 }
111 #endif
112
113
114 static unsigned int calc_speed(int mult)
115 {
116 int khz;
117 khz = (mult/10)*fsb;
118 if (mult%10)
119 khz += fsb/2;
120 khz *= 1000;
121 return khz;
122 }
123
124
125 static int longhaul_get_cpu_mult(void)
126 {
127 unsigned long invalue=0,lo, hi;
128
129 rdmsr (MSR_IA32_EBL_CR_POWERON, lo, hi);
130 invalue = (lo & (1<<22|1<<23|1<<24|1<<25)) >>22;
131 if (longhaul_version==TYPE_LONGHAUL_V2 || longhaul_version==TYPE_POWERSAVER) {
132 if (lo & (1<<27))
133 invalue+=16;
134 }
135 return eblcr_table[invalue];
136 }
137
138 /* For processor with BCR2 MSR */
139
140 static void do_longhaul1(unsigned int clock_ratio_index)
141 {
142 union msr_bcr2 bcr2;
143
144 rdmsrl(MSR_VIA_BCR2, bcr2.val);
145 /* Enable software clock multiplier */
146 bcr2.bits.ESOFTBF = 1;
147 bcr2.bits.CLOCKMUL = clock_ratio_index;
148
149 /* Sync to timer tick */
150 safe_halt();
151 /* Change frequency on next halt or sleep */
152 wrmsrl(MSR_VIA_BCR2, bcr2.val);
153 /* Invoke transition */
154 ACPI_FLUSH_CPU_CACHE();
155 halt();
156
157 /* Disable software clock multiplier */
158 local_irq_disable();
159 rdmsrl(MSR_VIA_BCR2, bcr2.val);
160 bcr2.bits.ESOFTBF = 0;
161 wrmsrl(MSR_VIA_BCR2, bcr2.val);
162 }
163
164 /* For processor with Longhaul MSR */
165
166 static void do_powersaver(int cx_address, unsigned int clock_ratio_index)
167 {
168 union msr_longhaul longhaul;
169 u8 dest_pos;
170 u32 t;
171
172 dest_pos = f_msr_table[clock_ratio_index].pos;
173
174 rdmsrl(MSR_VIA_LONGHAUL, longhaul.val);
175 /* Setup new frequency */
176 longhaul.bits.RevisionKey = longhaul.bits.RevisionID;
177 longhaul.bits.SoftBusRatio = clock_ratio_index & 0xf;
178 longhaul.bits.SoftBusRatio4 = (clock_ratio_index & 0x10) >> 4;
179 /* Setup new voltage */
180 if (can_scale_voltage)
181 longhaul.bits.SoftVID = f_msr_table[clock_ratio_index].vrm;
182 /* Sync to timer tick */
183 safe_halt();
184 /* Raise voltage if necessary */
185 if (can_scale_voltage && longhaul_pos < dest_pos) {
186 longhaul.bits.EnableSoftVID = 1;
187 wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
188 /* Change voltage */
189 if (!cx_address) {
190 ACPI_FLUSH_CPU_CACHE();
191 halt();
192 } else {
193 ACPI_FLUSH_CPU_CACHE();
194 /* Invoke C3 */
195 inb(cx_address);
196 /* Dummy op - must do something useless after P_LVL3
197 * read */
198 t = inl(acpi_gbl_FADT.xpm_timer_block.address);
199 }
200 longhaul.bits.EnableSoftVID = 0;
201 wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
202 longhaul_pos = dest_pos;
203 }
204
205 /* Change frequency on next halt or sleep */
206 longhaul.bits.EnableSoftBusRatio = 1;
207 wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
208 if (!cx_address) {
209 ACPI_FLUSH_CPU_CACHE();
210 halt();
211 } else {
212 ACPI_FLUSH_CPU_CACHE();
213 /* Invoke C3 */
214 inb(cx_address);
215 /* Dummy op - must do something useless after P_LVL3 read */
216 t = inl(acpi_gbl_FADT.xpm_timer_block.address);
217 }
218 /* Disable bus ratio bit */
219 longhaul.bits.EnableSoftBusRatio = 0;
220 wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
221
222 /* Reduce voltage if necessary */
223 if (can_scale_voltage && longhaul_pos > dest_pos) {
224 longhaul.bits.EnableSoftVID = 1;
225 wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
226 /* Change voltage */
227 if (!cx_address) {
228 ACPI_FLUSH_CPU_CACHE();
229 halt();
230 } else {
231 ACPI_FLUSH_CPU_CACHE();
232 /* Invoke C3 */
233 inb(cx_address);
234 /* Dummy op - must do something useless after P_LVL3
235 * read */
236 t = inl(acpi_gbl_FADT.xpm_timer_block.address);
237 }
238 longhaul.bits.EnableSoftVID = 0;
239 wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
240 longhaul_pos = dest_pos;
241 }
242 }
243
244 /**
245 * longhaul_set_cpu_frequency()
246 * @clock_ratio_index : bitpattern of the new multiplier.
247 *
248 * Sets a new clock ratio.
249 */
250
251 static void longhaul_setstate(unsigned int clock_ratio_index)
252 {
253 int speed, mult;
254 struct cpufreq_freqs freqs;
255 static unsigned int old_ratio=-1;
256 unsigned long flags;
257 unsigned int pic1_mask, pic2_mask;
258
259 if (old_ratio == clock_ratio_index)
260 return;
261 old_ratio = clock_ratio_index;
262
263 mult = clock_ratio[clock_ratio_index];
264 if (mult == -1)
265 return;
266
267 speed = calc_speed(mult);
268 if ((speed > highest_speed) || (speed < lowest_speed))
269 return;
270
271 freqs.old = calc_speed(longhaul_get_cpu_mult());
272 freqs.new = speed;
273 freqs.cpu = 0; /* longhaul.c is UP only driver */
274
275 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
276
277 dprintk ("Setting to FSB:%dMHz Mult:%d.%dx (%s)\n",
278 fsb, mult/10, mult%10, print_speed(speed/1000));
279
280 preempt_disable();
281 local_irq_save(flags);
282
283 pic2_mask = inb(0xA1);
284 pic1_mask = inb(0x21); /* works on C3. save mask. */
285 outb(0xFF,0xA1); /* Overkill */
286 outb(0xFE,0x21); /* TMR0 only */
287
288 if (longhaul_flags & USE_NORTHBRIDGE) {
289 /* Disable AGP and PCI arbiters */
290 outb(3, 0x22);
291 } else if ((pr != NULL) && pr->flags.bm_control) {
292 /* Disable bus master arbitration */
293 acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1);
294 }
295 switch (longhaul_version) {
296
297 /*
298 * Longhaul v1. (Samuel[C5A] and Samuel2 stepping 0[C5B])
299 * Software controlled multipliers only.
300 */
301 case TYPE_LONGHAUL_V1:
302 do_longhaul1(clock_ratio_index);
303 break;
304
305 /*
306 * Longhaul v2 appears in Samuel2 Steppings 1->7 [C5B] and Ezra [C5C]
307 *
308 * Longhaul v3 (aka Powersaver). (Ezra-T [C5M] & Nehemiah [C5N])
309 * Nehemiah can do FSB scaling too, but this has never been proven
310 * to work in practice.
311 */
312 case TYPE_LONGHAUL_V2:
313 case TYPE_POWERSAVER:
314 if (longhaul_flags & USE_ACPI_C3) {
315 /* Don't allow wakeup */
316 acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0);
317 do_powersaver(cx->address, clock_ratio_index);
318 } else {
319 do_powersaver(0, clock_ratio_index);
320 }
321 break;
322 }
323
324 if (longhaul_flags & USE_NORTHBRIDGE) {
325 /* Enable arbiters */
326 outb(0, 0x22);
327 } else if ((pr != NULL) && pr->flags.bm_control) {
328 /* Enable bus master arbitration */
329 acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
330 }
331 outb(pic2_mask,0xA1); /* restore mask */
332 outb(pic1_mask,0x21);
333
334 local_irq_restore(flags);
335 preempt_enable();
336
337 freqs.new = calc_speed(longhaul_get_cpu_mult());
338 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
339 }
340
341 /*
342 * Centaur decided to make life a little more tricky.
343 * Only longhaul v1 is allowed to read EBLCR BSEL[0:1].
344 * Samuel2 and above have to try and guess what the FSB is.
345 * We do this by assuming we booted at maximum multiplier, and interpolate
346 * between that value multiplied by possible FSBs and cpu_mhz which
347 * was calculated at boot time. Really ugly, but no other way to do this.
348 */
349
350 #define ROUNDING 0xf
351
352 static int guess_fsb(int mult)
353 {
354 int speed = cpu_khz / 1000;
355 int i;
356 int speeds[] = { 666, 1000, 1333, 2000 };
357 int f_max, f_min;
358
359 for (i = 0; i < 4; i++) {
360 f_max = ((speeds[i] * mult) + 50) / 100;
361 f_max += (ROUNDING / 2);
362 f_min = f_max - ROUNDING;
363 if ((speed <= f_max) && (speed >= f_min))
364 return speeds[i] / 10;
365 }
366 return 0;
367 }
368
369
370 static int __init longhaul_get_ranges(void)
371 {
372 unsigned int j, k = 0;
373 int mult;
374
375 /* Get current frequency */
376 mult = longhaul_get_cpu_mult();
377 if (mult == -1) {
378 printk(KERN_INFO PFX "Invalid (reserved) multiplier!\n");
379 return -EINVAL;
380 }
381 fsb = guess_fsb(mult);
382 if (fsb == 0) {
383 printk(KERN_INFO PFX "Invalid (reserved) FSB!\n");
384 return -EINVAL;
385 }
386 /* Get max multiplier - as we always did.
387 * Longhaul MSR is usefull only when voltage scaling is enabled.
388 * C3 is booting at max anyway. */
389 maxmult = mult;
390 /* Get min multiplier */
391 switch (cpu_model) {
392 case CPU_NEHEMIAH:
393 minmult = 50;
394 break;
395 case CPU_NEHEMIAH_C:
396 minmult = 40;
397 break;
398 default:
399 minmult = 30;
400 break;
401 }
402
403 dprintk ("MinMult:%d.%dx MaxMult:%d.%dx\n",
404 minmult/10, minmult%10, maxmult/10, maxmult%10);
405
406 highest_speed = calc_speed(maxmult);
407 lowest_speed = calc_speed(minmult);
408 dprintk ("FSB:%dMHz Lowest speed: %s Highest speed:%s\n", fsb,
409 print_speed(lowest_speed/1000),
410 print_speed(highest_speed/1000));
411
412 if (lowest_speed == highest_speed) {
413 printk (KERN_INFO PFX "highestspeed == lowest, aborting.\n");
414 return -EINVAL;
415 }
416 if (lowest_speed > highest_speed) {
417 printk (KERN_INFO PFX "nonsense! lowest (%d > %d) !\n",
418 lowest_speed, highest_speed);
419 return -EINVAL;
420 }
421
422 longhaul_table = kmalloc((numscales + 1) * sizeof(struct cpufreq_frequency_table), GFP_KERNEL);
423 if(!longhaul_table)
424 return -ENOMEM;
425
426 for (j=0; j < numscales; j++) {
427 unsigned int ratio;
428 ratio = clock_ratio[j];
429 if (ratio == -1)
430 continue;
431 if (ratio > maxmult || ratio < minmult)
432 continue;
433 longhaul_table[k].frequency = calc_speed(ratio);
434 longhaul_table[k].index = j;
435 k++;
436 }
437
438 longhaul_table[k].frequency = CPUFREQ_TABLE_END;
439 if (!k) {
440 kfree (longhaul_table);
441 return -EINVAL;
442 }
443
444 return 0;
445 }
446
447
448 static void __init longhaul_setup_voltagescaling(void)
449 {
450 union msr_longhaul longhaul;
451 struct mV_pos minvid, maxvid;
452 unsigned int j, speed, pos, kHz_step, numvscales;
453 int min_vid_speed;
454
455 rdmsrl(MSR_VIA_LONGHAUL, longhaul.val);
456 if (!(longhaul.bits.RevisionID & 1)) {
457 printk(KERN_INFO PFX "Voltage scaling not supported by CPU.\n");
458 return;
459 }
460
461 if (!longhaul.bits.VRMRev) {
462 printk (KERN_INFO PFX "VRM 8.5\n");
463 vrm_mV_table = &vrm85_mV[0];
464 mV_vrm_table = &mV_vrm85[0];
465 } else {
466 printk (KERN_INFO PFX "Mobile VRM\n");
467 if (cpu_model < CPU_NEHEMIAH)
468 return;
469 vrm_mV_table = &mobilevrm_mV[0];
470 mV_vrm_table = &mV_mobilevrm[0];
471 }
472
473 minvid = vrm_mV_table[longhaul.bits.MinimumVID];
474 maxvid = vrm_mV_table[longhaul.bits.MaximumVID];
475
476 if (minvid.mV == 0 || maxvid.mV == 0 || minvid.mV > maxvid.mV) {
477 printk (KERN_INFO PFX "Bogus values Min:%d.%03d Max:%d.%03d. "
478 "Voltage scaling disabled.\n",
479 minvid.mV/1000, minvid.mV%1000, maxvid.mV/1000, maxvid.mV%1000);
480 return;
481 }
482
483 if (minvid.mV == maxvid.mV) {
484 printk (KERN_INFO PFX "Claims to support voltage scaling but min & max are "
485 "both %d.%03d. Voltage scaling disabled\n",
486 maxvid.mV/1000, maxvid.mV%1000);
487 return;
488 }
489
490 /* How many voltage steps */
491 numvscales = maxvid.pos - minvid.pos + 1;
492 printk(KERN_INFO PFX
493 "Max VID=%d.%03d "
494 "Min VID=%d.%03d, "
495 "%d possible voltage scales\n",
496 maxvid.mV/1000, maxvid.mV%1000,
497 minvid.mV/1000, minvid.mV%1000,
498 numvscales);
499
500 /* Calculate max frequency at min voltage */
501 j = longhaul.bits.MinMHzBR;
502 if (longhaul.bits.MinMHzBR4)
503 j += 16;
504 min_vid_speed = eblcr_table[j];
505 if (min_vid_speed == -1)
506 return;
507 switch (longhaul.bits.MinMHzFSB) {
508 case 0:
509 min_vid_speed *= 13333;
510 break;
511 case 1:
512 min_vid_speed *= 10000;
513 break;
514 case 3:
515 min_vid_speed *= 6666;
516 break;
517 default:
518 return;
519 break;
520 }
521 if (min_vid_speed >= highest_speed)
522 return;
523 /* Calculate kHz for one voltage step */
524 kHz_step = (highest_speed - min_vid_speed) / numvscales;
525
526
527 j = 0;
528 while (longhaul_table[j].frequency != CPUFREQ_TABLE_END) {
529 speed = longhaul_table[j].frequency;
530 if (speed > min_vid_speed)
531 pos = (speed - min_vid_speed) / kHz_step + minvid.pos;
532 else
533 pos = minvid.pos;
534 f_msr_table[longhaul_table[j].index].vrm = mV_vrm_table[pos];
535 f_msr_table[longhaul_table[j].index].pos = pos;
536 j++;
537 }
538
539 longhaul_pos = maxvid.pos;
540 can_scale_voltage = 1;
541 printk(KERN_INFO PFX "Voltage scaling enabled. "
542 "Use of \"conservative\" governor is highly recommended.\n");
543 }
544
545
546 static int longhaul_verify(struct cpufreq_policy *policy)
547 {
548 return cpufreq_frequency_table_verify(policy, longhaul_table);
549 }
550
551
552 static int longhaul_target(struct cpufreq_policy *policy,
553 unsigned int target_freq, unsigned int relation)
554 {
555 unsigned int table_index = 0;
556 unsigned int new_clock_ratio = 0;
557
558 if (cpufreq_frequency_table_target(policy, longhaul_table, target_freq, relation, &table_index))
559 return -EINVAL;
560
561 new_clock_ratio = longhaul_table[table_index].index & 0xFF;
562
563 longhaul_setstate(new_clock_ratio);
564
565 return 0;
566 }
567
568
569 static unsigned int longhaul_get(unsigned int cpu)
570 {
571 if (cpu)
572 return 0;
573 return calc_speed(longhaul_get_cpu_mult());
574 }
575
576 static acpi_status longhaul_walk_callback(acpi_handle obj_handle,
577 u32 nesting_level,
578 void *context, void **return_value)
579 {
580 struct acpi_device *d;
581
582 if ( acpi_bus_get_device(obj_handle, &d) ) {
583 return 0;
584 }
585 *return_value = (void *)acpi_driver_data(d);
586 return 1;
587 }
588
589 /* VIA don't support PM2 reg, but have something similar */
590 static int enable_arbiter_disable(void)
591 {
592 struct pci_dev *dev;
593 int reg;
594 u8 pci_cmd;
595
596 /* Find PLE133 host bridge */
597 reg = 0x78;
598 dev = pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8601_0, NULL);
599 /* Find CLE266 host bridge */
600 if (dev == NULL) {
601 reg = 0x76;
602 dev = pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_862X_0, NULL);
603 /* Find CN400 V-Link host bridge */
604 if (dev == NULL)
605 dev = pci_find_device(PCI_VENDOR_ID_VIA, 0x7259, NULL);
606
607 }
608 if (dev != NULL) {
609 /* Enable access to port 0x22 */
610 pci_read_config_byte(dev, reg, &pci_cmd);
611 if (!(pci_cmd & 1<<7)) {
612 pci_cmd |= 1<<7;
613 pci_write_config_byte(dev, reg, pci_cmd);
614 pci_read_config_byte(dev, reg, &pci_cmd);
615 if (!(pci_cmd & 1<<7)) {
616 printk(KERN_ERR PFX
617 "Can't enable access to port 0x22.\n");
618 return 0;
619 }
620 }
621 return 1;
622 }
623 return 0;
624 }
625
626 static int longhaul_setup_vt8235(void)
627 {
628 struct pci_dev *dev;
629 u8 pci_cmd;
630
631 /* Find VT8235 southbridge */
632 dev = pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235, NULL);
633 if (dev != NULL) {
634 /* Set transition time to max */
635 pci_read_config_byte(dev, 0xec, &pci_cmd);
636 pci_cmd &= ~(1 << 2);
637 pci_write_config_byte(dev, 0xec, pci_cmd);
638 pci_read_config_byte(dev, 0xe4, &pci_cmd);
639 pci_cmd &= ~(1 << 7);
640 pci_write_config_byte(dev, 0xe4, pci_cmd);
641 pci_read_config_byte(dev, 0xe5, &pci_cmd);
642 pci_cmd |= 1 << 7;
643 pci_write_config_byte(dev, 0xe5, pci_cmd);
644 return 1;
645 }
646 return 0;
647 }
648
649 static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
650 {
651 struct cpuinfo_x86 *c = cpu_data;
652 char *cpuname=NULL;
653 int ret;
654 u32 lo, hi;
655 int vt8235_present;
656
657 /* Check what we have on this motherboard */
658 switch (c->x86_model) {
659 case 6:
660 cpu_model = CPU_SAMUEL;
661 cpuname = "C3 'Samuel' [C5A]";
662 longhaul_version = TYPE_LONGHAUL_V1;
663 memcpy (clock_ratio, samuel1_clock_ratio, sizeof(samuel1_clock_ratio));
664 memcpy (eblcr_table, samuel1_eblcr, sizeof(samuel1_eblcr));
665 break;
666
667 case 7:
668 switch (c->x86_mask) {
669 case 0:
670 longhaul_version = TYPE_LONGHAUL_V1;
671 cpu_model = CPU_SAMUEL2;
672 cpuname = "C3 'Samuel 2' [C5B]";
673 /* Note, this is not a typo, early Samuel2's had
674 * Samuel1 ratios. */
675 memcpy(clock_ratio, samuel1_clock_ratio,
676 sizeof(samuel1_clock_ratio));
677 memcpy(eblcr_table, samuel2_eblcr,
678 sizeof(samuel2_eblcr));
679 break;
680 case 1 ... 15:
681 longhaul_version = TYPE_LONGHAUL_V2;
682 if (c->x86_mask < 8) {
683 cpu_model = CPU_SAMUEL2;
684 cpuname = "C3 'Samuel 2' [C5B]";
685 } else {
686 cpu_model = CPU_EZRA;
687 cpuname = "C3 'Ezra' [C5C]";
688 }
689 memcpy(clock_ratio, ezra_clock_ratio,
690 sizeof(ezra_clock_ratio));
691 memcpy(eblcr_table, ezra_eblcr,
692 sizeof(ezra_eblcr));
693 break;
694 }
695 break;
696
697 case 8:
698 cpu_model = CPU_EZRA_T;
699 cpuname = "C3 'Ezra-T' [C5M]";
700 longhaul_version = TYPE_POWERSAVER;
701 numscales=32;
702 memcpy (clock_ratio, ezrat_clock_ratio, sizeof(ezrat_clock_ratio));
703 memcpy (eblcr_table, ezrat_eblcr, sizeof(ezrat_eblcr));
704 break;
705
706 case 9:
707 longhaul_version = TYPE_POWERSAVER;
708 numscales = 32;
709 memcpy(clock_ratio,
710 nehemiah_clock_ratio,
711 sizeof(nehemiah_clock_ratio));
712 memcpy(eblcr_table, nehemiah_eblcr, sizeof(nehemiah_eblcr));
713 switch (c->x86_mask) {
714 case 0 ... 1:
715 cpu_model = CPU_NEHEMIAH;
716 cpuname = "C3 'Nehemiah A' [C5XLOE]";
717 break;
718 case 2 ... 4:
719 cpu_model = CPU_NEHEMIAH;
720 cpuname = "C3 'Nehemiah B' [C5XLOH]";
721 break;
722 case 5 ... 15:
723 cpu_model = CPU_NEHEMIAH_C;
724 cpuname = "C3 'Nehemiah C' [C5P]";
725 break;
726 }
727 break;
728
729 default:
730 cpuname = "Unknown";
731 break;
732 }
733 /* Check Longhaul ver. 2 */
734 if (longhaul_version == TYPE_LONGHAUL_V2) {
735 rdmsr(MSR_VIA_LONGHAUL, lo, hi);
736 if (lo == 0 && hi == 0)
737 /* Looks like MSR isn't present */
738 longhaul_version = TYPE_LONGHAUL_V1;
739 }
740
741 printk (KERN_INFO PFX "VIA %s CPU detected. ", cpuname);
742 switch (longhaul_version) {
743 case TYPE_LONGHAUL_V1:
744 case TYPE_LONGHAUL_V2:
745 printk ("Longhaul v%d supported.\n", longhaul_version);
746 break;
747 case TYPE_POWERSAVER:
748 printk ("Powersaver supported.\n");
749 break;
750 };
751
752 /* Doesn't hurt */
753 vt8235_present = longhaul_setup_vt8235();
754
755 /* Find ACPI data for processor */
756 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
757 ACPI_UINT32_MAX, &longhaul_walk_callback,
758 NULL, (void *)&pr);
759
760 /* Check ACPI support for C3 state */
761 if (pr != NULL && longhaul_version != TYPE_LONGHAUL_V1) {
762 cx = &pr->power.states[ACPI_STATE_C3];
763 if (cx->address > 0 && cx->latency <= 1000) {
764 longhaul_flags |= USE_ACPI_C3;
765 goto print_support_type;
766 }
767 }
768 /* Check if northbridge is friendly */
769 if (enable_arbiter_disable()) {
770 longhaul_flags |= USE_NORTHBRIDGE;
771 goto print_support_type;
772 }
773 /* Use VT8235 southbridge if present */
774 if (longhaul_version == TYPE_POWERSAVER && vt8235_present) {
775 longhaul_flags |= USE_VT8235;
776 goto print_support_type;
777 }
778 /* Check ACPI support for bus master arbiter disable */
779 if ((pr == NULL) || !(pr->flags.bm_control)) {
780 printk(KERN_ERR PFX
781 "No ACPI support. Unsupported northbridge.\n");
782 return -ENODEV;
783 }
784
785 print_support_type:
786 if (longhaul_flags & USE_NORTHBRIDGE)
787 printk (KERN_INFO PFX "Using northbridge support.\n");
788 else if (longhaul_flags & USE_VT8235)
789 printk (KERN_INFO PFX "Using VT8235 support.\n");
790 else
791 printk (KERN_INFO PFX "Using ACPI support.\n");
792
793 ret = longhaul_get_ranges();
794 if (ret != 0)
795 return ret;
796
797 if ((longhaul_version != TYPE_LONGHAUL_V1) && (scale_voltage != 0))
798 longhaul_setup_voltagescaling();
799
800 policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
801 policy->cpuinfo.transition_latency = 200000; /* nsec */
802 policy->cur = calc_speed(longhaul_get_cpu_mult());
803
804 ret = cpufreq_frequency_table_cpuinfo(policy, longhaul_table);
805 if (ret)
806 return ret;
807
808 cpufreq_frequency_table_get_attr(longhaul_table, policy->cpu);
809
810 return 0;
811 }
812
813 static int __devexit longhaul_cpu_exit(struct cpufreq_policy *policy)
814 {
815 cpufreq_frequency_table_put_attr(policy->cpu);
816 return 0;
817 }
818
819 static struct freq_attr* longhaul_attr[] = {
820 &cpufreq_freq_attr_scaling_available_freqs,
821 NULL,
822 };
823
824 static const struct cpufreq_driver longhaul_driver = {
825 .verify = longhaul_verify,
826 .target = longhaul_target,
827 .get = longhaul_get,
828 .init = longhaul_cpu_init,
829 .exit = __devexit_p(longhaul_cpu_exit),
830 .name = "longhaul",
831 .owner = THIS_MODULE,
832 .attr = longhaul_attr,
833 };
834
835
836 static int __init longhaul_init(void)
837 {
838 struct cpuinfo_x86 *c = cpu_data;
839
840 if (c->x86_vendor != X86_VENDOR_CENTAUR || c->x86 != 6)
841 return -ENODEV;
842
843 #ifdef CONFIG_SMP
844 if (num_online_cpus() > 1) {
845 printk(KERN_ERR PFX "More than 1 CPU detected, longhaul disabled.\n");
846 return -ENODEV;
847 }
848 #endif
849 #ifdef CONFIG_X86_IO_APIC
850 if (cpu_has_apic) {
851 printk(KERN_ERR PFX "APIC detected. Longhaul is currently broken in this configuration.\n");
852 return -ENODEV;
853 }
854 #endif
855 switch (c->x86_model) {
856 case 6 ... 9:
857 return cpufreq_register_driver(&longhaul_driver);
858 case 10:
859 printk(KERN_ERR PFX "Use acpi-cpufreq driver for VIA C7\n");
860 default:
861 ;;
862 }
863
864 return -ENODEV;
865 }
866
867
868 static void __exit longhaul_exit(void)
869 {
870 int i;
871
872 for (i=0; i < numscales; i++) {
873 if (clock_ratio[i] == maxmult) {
874 longhaul_setstate(i);
875 break;
876 }
877 }
878
879 cpufreq_unregister_driver(&longhaul_driver);
880 kfree(longhaul_table);
881 }
882
883 module_param (scale_voltage, int, 0644);
884 MODULE_PARM_DESC(scale_voltage, "Scale voltage of processor");
885
886 MODULE_AUTHOR ("Dave Jones <davej@codemonkey.org.uk>");
887 MODULE_DESCRIPTION ("Longhaul driver for VIA Cyrix processors.");
888 MODULE_LICENSE ("GPL");
889
890 late_initcall(longhaul_init);
891 module_exit(longhaul_exit);
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