1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16#include <linux/module.h>
17#include <linux/types.h>
18#include <linux/errno.h>
19#include <linux/kernel.h>
20#include <linux/delay.h>
21#include <linux/sched.h>
22#include <linux/adb.h>
23#include <linux/pmu.h>
24#include <linux/cpufreq.h>
25#include <linux/init.h>
26#include <linux/device.h>
27#include <linux/hardirq.h>
28#include <linux/of_device.h>
29#include <asm/prom.h>
30#include <asm/machdep.h>
31#include <asm/irq.h>
32#include <asm/pmac_feature.h>
33#include <asm/mmu_context.h>
34#include <asm/sections.h>
35#include <asm/cputable.h>
36#include <asm/time.h>
37#include <asm/mpic.h>
38#include <asm/keylargo.h>
39#include <asm/switch_to.h>
40
41
42
43
44
45#undef DEBUG_FREQ
46
47extern void low_choose_7447a_dfs(int dfs);
48extern void low_choose_750fx_pll(int pll);
49extern void low_sleep_handler(void);
50
51
52
53
54
55static unsigned int low_freq;
56static unsigned int hi_freq;
57static unsigned int cur_freq;
58static unsigned int sleep_freq;
59static unsigned long transition_latency;
60
61
62
63
64static int (*set_speed_proc)(int low_speed);
65static unsigned int (*get_speed_proc)(void);
66
67
68
69
70static u32 voltage_gpio;
71static u32 frequency_gpio;
72static u32 slew_done_gpio;
73static int no_schedule;
74static int has_cpu_l2lve;
75static int is_pmu_based;
76
77
78
79
80#define CPUFREQ_HIGH 0
81#define CPUFREQ_LOW 1
82
83static struct cpufreq_frequency_table pmac_cpu_freqs[] = {
84 {0, CPUFREQ_HIGH, 0},
85 {0, CPUFREQ_LOW, 0},
86 {0, 0, CPUFREQ_TABLE_END},
87};
88
89static inline void local_delay(unsigned long ms)
90{
91 if (no_schedule)
92 mdelay(ms);
93 else
94 msleep(ms);
95}
96
97#ifdef DEBUG_FREQ
98static inline void debug_calc_bogomips(void)
99{
100
101
102
103
104 unsigned long save_lpj = loops_per_jiffy;
105 calibrate_delay();
106 loops_per_jiffy = save_lpj;
107}
108#endif
109
110
111
112static int cpu_750fx_cpu_speed(int low_speed)
113{
114 u32 hid2;
115
116 if (low_speed == 0) {
117
118 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
119
120 local_delay(10);
121
122
123 if (has_cpu_l2lve) {
124 hid2 = mfspr(SPRN_HID2);
125 hid2 &= ~0x2000;
126 mtspr(SPRN_HID2, hid2);
127 }
128 }
129#ifdef CONFIG_6xx
130 low_choose_750fx_pll(low_speed);
131#endif
132 if (low_speed == 1) {
133
134 if (has_cpu_l2lve) {
135 hid2 = mfspr(SPRN_HID2);
136 hid2 |= 0x2000;
137 mtspr(SPRN_HID2, hid2);
138 }
139
140
141 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
142 local_delay(10);
143 }
144
145 return 0;
146}
147
148static unsigned int cpu_750fx_get_cpu_speed(void)
149{
150 if (mfspr(SPRN_HID1) & HID1_PS)
151 return low_freq;
152 else
153 return hi_freq;
154}
155
156
157static int dfs_set_cpu_speed(int low_speed)
158{
159 if (low_speed == 0) {
160
161 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
162
163 local_delay(1);
164 }
165
166
167#ifdef CONFIG_6xx
168 low_choose_7447a_dfs(low_speed);
169#endif
170 udelay(100);
171
172 if (low_speed == 1) {
173
174 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
175 local_delay(1);
176 }
177
178 return 0;
179}
180
181static unsigned int dfs_get_cpu_speed(void)
182{
183 if (mfspr(SPRN_HID1) & HID1_DFS)
184 return low_freq;
185 else
186 return hi_freq;
187}
188
189
190
191
192static int gpios_set_cpu_speed(int low_speed)
193{
194 int gpio, timeout = 0;
195
196
197 if (low_speed == 0) {
198 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
199
200 local_delay(10);
201 }
202
203
204 gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0);
205 if (low_speed == ((gpio & 0x01) == 0))
206 goto skip;
207
208 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, frequency_gpio,
209 low_speed ? 0x04 : 0x05);
210 udelay(200);
211 do {
212 if (++timeout > 100)
213 break;
214 local_delay(1);
215 gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, slew_done_gpio, 0);
216 } while((gpio & 0x02) == 0);
217 skip:
218
219 if (low_speed == 1) {
220 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
221
222 local_delay(10);
223 }
224
225#ifdef DEBUG_FREQ
226 debug_calc_bogomips();
227#endif
228
229 return 0;
230}
231
232
233
234static int pmu_set_cpu_speed(int low_speed)
235{
236 struct adb_request req;
237 unsigned long save_l2cr;
238 unsigned long save_l3cr;
239 unsigned int pic_prio;
240 unsigned long flags;
241
242 preempt_disable();
243
244#ifdef DEBUG_FREQ
245 printk(KERN_DEBUG "HID1, before: %x\n", mfspr(SPRN_HID1));
246#endif
247 pmu_suspend();
248
249
250 pic_prio = mpic_cpu_get_priority();
251 mpic_cpu_set_priority(0xf);
252
253
254 asm volatile("mtdec %0" : : "r" (0x7fffffff));
255
256
257 mb();
258 asm volatile("mtdec %0" : : "r" (0x7fffffff));
259
260
261 local_irq_save(flags);
262
263
264 enable_kernel_fp();
265
266#ifdef CONFIG_ALTIVEC
267 if (cpu_has_feature(CPU_FTR_ALTIVEC))
268 enable_kernel_altivec();
269#endif
270
271
272 save_l3cr = _get_L3CR();
273 save_l2cr = _get_L2CR();
274
275
276
277
278 pmu_request(&req, NULL, 6, PMU_CPU_SPEED, 'W', 'O', 'O', 'F', low_speed);
279 while (!req.complete)
280 pmu_poll();
281
282
283 pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,1);
284
285
286
287
288 low_sleep_handler();
289
290
291 pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,0);
292
293
294 if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0)
295 _set_L2CR(save_l2cr);
296
297 if (save_l3cr != 0xffffffff && (save_l3cr & L3CR_L3E) != 0)
298 _set_L3CR(save_l3cr);
299
300
301 switch_mmu_context(NULL, current->active_mm);
302
303#ifdef DEBUG_FREQ
304 printk(KERN_DEBUG "HID1, after: %x\n", mfspr(SPRN_HID1));
305#endif
306
307
308 pmu_unlock();
309
310
311
312
313
314
315 set_dec(1);
316
317
318 mpic_cpu_set_priority(pic_prio);
319
320
321 local_irq_restore(flags);
322
323#ifdef DEBUG_FREQ
324 debug_calc_bogomips();
325#endif
326
327 pmu_resume();
328
329 preempt_enable();
330
331 return 0;
332}
333
334static int do_set_cpu_speed(struct cpufreq_policy *policy, int speed_mode)
335{
336 unsigned long l3cr;
337 static unsigned long prev_l3cr;
338
339 if (speed_mode == CPUFREQ_LOW &&
340 cpu_has_feature(CPU_FTR_L3CR)) {
341 l3cr = _get_L3CR();
342 if (l3cr & L3CR_L3E) {
343 prev_l3cr = l3cr;
344 _set_L3CR(0);
345 }
346 }
347 set_speed_proc(speed_mode == CPUFREQ_LOW);
348 if (speed_mode == CPUFREQ_HIGH &&
349 cpu_has_feature(CPU_FTR_L3CR)) {
350 l3cr = _get_L3CR();
351 if ((prev_l3cr & L3CR_L3E) && l3cr != prev_l3cr)
352 _set_L3CR(prev_l3cr);
353 }
354 cur_freq = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq;
355
356 return 0;
357}
358
359static unsigned int pmac_cpufreq_get_speed(unsigned int cpu)
360{
361 return cur_freq;
362}
363
364static int pmac_cpufreq_target( struct cpufreq_policy *policy,
365 unsigned int index)
366{
367 int rc;
368
369 rc = do_set_cpu_speed(policy, index);
370
371 ppc_proc_freq = cur_freq * 1000ul;
372 return rc;
373}
374
375static int pmac_cpufreq_cpu_init(struct cpufreq_policy *policy)
376{
377 return cpufreq_generic_init(policy, pmac_cpu_freqs, transition_latency);
378}
379
380static u32 read_gpio(struct device_node *np)
381{
382 const u32 *reg = of_get_property(np, "reg", NULL);
383 u32 offset;
384
385 if (reg == NULL)
386 return 0;
387
388
389
390
391
392
393 offset = *reg;
394 if (offset < KEYLARGO_GPIO_LEVELS0)
395 offset += KEYLARGO_GPIO_LEVELS0;
396 return offset;
397}
398
399static int pmac_cpufreq_suspend(struct cpufreq_policy *policy)
400{
401
402
403
404
405
406
407
408 no_schedule = 1;
409 sleep_freq = cur_freq;
410 if (cur_freq == low_freq && !is_pmu_based)
411 do_set_cpu_speed(policy, CPUFREQ_HIGH);
412 return 0;
413}
414
415static int pmac_cpufreq_resume(struct cpufreq_policy *policy)
416{
417
418 if (get_speed_proc)
419 cur_freq = get_speed_proc();
420 else
421 cur_freq = 0;
422
423
424
425
426
427 do_set_cpu_speed(policy, sleep_freq == low_freq ?
428 CPUFREQ_LOW : CPUFREQ_HIGH);
429
430 ppc_proc_freq = cur_freq * 1000ul;
431
432 no_schedule = 0;
433 return 0;
434}
435
436static struct cpufreq_driver pmac_cpufreq_driver = {
437 .verify = cpufreq_generic_frequency_table_verify,
438 .target_index = pmac_cpufreq_target,
439 .get = pmac_cpufreq_get_speed,
440 .init = pmac_cpufreq_cpu_init,
441 .suspend = pmac_cpufreq_suspend,
442 .resume = pmac_cpufreq_resume,
443 .flags = CPUFREQ_PM_NO_WARN,
444 .attr = cpufreq_generic_attr,
445 .name = "powermac",
446};
447
448
449static int pmac_cpufreq_init_MacRISC3(struct device_node *cpunode)
450{
451 struct device_node *volt_gpio_np = of_find_node_by_name(NULL,
452 "voltage-gpio");
453 struct device_node *freq_gpio_np = of_find_node_by_name(NULL,
454 "frequency-gpio");
455 struct device_node *slew_done_gpio_np = of_find_node_by_name(NULL,
456 "slewing-done");
457 const u32 *value;
458
459
460
461
462
463
464
465
466
467 if (volt_gpio_np)
468 voltage_gpio = read_gpio(volt_gpio_np);
469 if (freq_gpio_np)
470 frequency_gpio = read_gpio(freq_gpio_np);
471 if (slew_done_gpio_np)
472 slew_done_gpio = read_gpio(slew_done_gpio_np);
473
474
475
476
477 if (frequency_gpio && slew_done_gpio) {
478 int lenp, rc;
479 const u32 *freqs, *ratio;
480
481 freqs = of_get_property(cpunode, "bus-frequencies", &lenp);
482 lenp /= sizeof(u32);
483 if (freqs == NULL || lenp != 2) {
484 printk(KERN_ERR "cpufreq: bus-frequencies incorrect or missing\n");
485 return 1;
486 }
487 ratio = of_get_property(cpunode, "processor-to-bus-ratio*2",
488 NULL);
489 if (ratio == NULL) {
490 printk(KERN_ERR "cpufreq: processor-to-bus-ratio*2 missing\n");
491 return 1;
492 }
493
494
495 low_freq = min(freqs[0], freqs[1]);
496 hi_freq = max(freqs[0], freqs[1]);
497
498
499
500
501
502
503 if (low_freq < 98000000)
504 low_freq = 101000000;
505
506
507 low_freq = (low_freq * (*ratio)) / 2000;
508 hi_freq = (hi_freq * (*ratio)) / 2000;
509
510
511
512
513 rc = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0);
514 cur_freq = (rc & 0x01) ? hi_freq : low_freq;
515
516 set_speed_proc = gpios_set_cpu_speed;
517 return 1;
518 }
519
520
521
522
523 value = of_get_property(cpunode, "min-clock-frequency", NULL);
524 if (!value)
525 return 1;
526 low_freq = (*value) / 1000;
527
528
529 if (low_freq < 100000)
530 low_freq *= 10;
531
532 value = of_get_property(cpunode, "max-clock-frequency", NULL);
533 if (!value)
534 return 1;
535 hi_freq = (*value) / 1000;
536 set_speed_proc = pmu_set_cpu_speed;
537 is_pmu_based = 1;
538
539 return 0;
540}
541
542static int pmac_cpufreq_init_7447A(struct device_node *cpunode)
543{
544 struct device_node *volt_gpio_np;
545
546 if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL)
547 return 1;
548
549 volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
550 if (volt_gpio_np)
551 voltage_gpio = read_gpio(volt_gpio_np);
552 if (!voltage_gpio){
553 printk(KERN_ERR "cpufreq: missing cpu-vcore-select gpio\n");
554 return 1;
555 }
556
557
558 hi_freq = cur_freq;
559 low_freq = cur_freq/2;
560
561
562 cur_freq = dfs_get_cpu_speed();
563 set_speed_proc = dfs_set_cpu_speed;
564 get_speed_proc = dfs_get_cpu_speed;
565
566 return 0;
567}
568
569static int pmac_cpufreq_init_750FX(struct device_node *cpunode)
570{
571 struct device_node *volt_gpio_np;
572 u32 pvr;
573 const u32 *value;
574
575 if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL)
576 return 1;
577
578 hi_freq = cur_freq;
579 value = of_get_property(cpunode, "reduced-clock-frequency", NULL);
580 if (!value)
581 return 1;
582 low_freq = (*value) / 1000;
583
584 volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
585 if (volt_gpio_np)
586 voltage_gpio = read_gpio(volt_gpio_np);
587
588 pvr = mfspr(SPRN_PVR);
589 has_cpu_l2lve = !((pvr & 0xf00) == 0x100);
590
591 set_speed_proc = cpu_750fx_cpu_speed;
592 get_speed_proc = cpu_750fx_get_cpu_speed;
593 cur_freq = cpu_750fx_get_cpu_speed();
594
595 return 0;
596}
597
598
599
600
601
602
603
604
605
606
607
608
609static int __init pmac_cpufreq_setup(void)
610{
611 struct device_node *cpunode;
612 const u32 *value;
613
614 if (strstr(boot_command_line, "nocpufreq"))
615 return 0;
616
617
618 cpunode = of_cpu_device_node_get(0);
619 if (!cpunode)
620 goto out;
621
622
623 value = of_get_property(cpunode, "clock-frequency", NULL);
624 if (!value)
625 goto out;
626 cur_freq = (*value) / 1000;
627 transition_latency = CPUFREQ_ETERNAL;
628
629
630 if (of_machine_is_compatible("MacRISC3") &&
631 of_get_property(cpunode, "dynamic-power-step", NULL) &&
632 PVR_VER(mfspr(SPRN_PVR)) == 0x8003) {
633 pmac_cpufreq_init_7447A(cpunode);
634 transition_latency = 8000000;
635
636 } else if (of_machine_is_compatible("PowerBook3,4") ||
637 of_machine_is_compatible("PowerBook3,5") ||
638 of_machine_is_compatible("MacRISC3")) {
639 pmac_cpufreq_init_MacRISC3(cpunode);
640
641 } else if (of_machine_is_compatible("PowerBook4,1")) {
642 hi_freq = cur_freq;
643 low_freq = 400000;
644 set_speed_proc = pmu_set_cpu_speed;
645 is_pmu_based = 1;
646 }
647
648 else if (of_machine_is_compatible("PowerBook3,3") && cur_freq == 550000) {
649 hi_freq = cur_freq;
650 low_freq = 500000;
651 set_speed_proc = pmu_set_cpu_speed;
652 is_pmu_based = 1;
653 }
654
655 else if (of_machine_is_compatible("PowerBook3,2")) {
656
657
658
659 if (cur_freq < 350000 || cur_freq > 550000)
660 goto out;
661 hi_freq = cur_freq;
662 low_freq = 300000;
663 set_speed_proc = pmu_set_cpu_speed;
664 is_pmu_based = 1;
665 }
666
667 else if (PVR_VER(mfspr(SPRN_PVR)) == 0x7000)
668 pmac_cpufreq_init_750FX(cpunode);
669out:
670 of_node_put(cpunode);
671 if (set_speed_proc == NULL)
672 return -ENODEV;
673
674 pmac_cpu_freqs[CPUFREQ_LOW].frequency = low_freq;
675 pmac_cpu_freqs[CPUFREQ_HIGH].frequency = hi_freq;
676 ppc_proc_freq = cur_freq * 1000ul;
677
678 printk(KERN_INFO "Registering PowerMac CPU frequency driver\n");
679 printk(KERN_INFO "Low: %d Mhz, High: %d Mhz, Boot: %d Mhz\n",
680 low_freq/1000, hi_freq/1000, cur_freq/1000);
681
682 return cpufreq_register_driver(&pmac_cpufreq_driver);
683}
684
685module_init(pmac_cpufreq_setup);
686
687