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Paul Mackerras14cf11a2005-09-26 16:04:21 +10001/*
Paul Mackerras14cf11a2005-09-26 16:04:21 +10002 * Copyright (C) 2002 - 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
3 * Copyright (C) 2004 John Steele Scott <toojays@toojays.net>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * TODO: Need a big cleanup here. Basically, we need to have different
10 * cpufreq_driver structures for the different type of HW instead of the
11 * current mess. We also need to better deal with the detection of the
12 * type of machine.
13 *
14 */
15
Paul Mackerras14cf11a2005-09-26 16:04:21 +100016#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>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100024#include <linux/cpufreq.h>
25#include <linux/init.h>
26#include <linux/sysdev.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100027#include <linux/hardirq.h>
28#include <asm/prom.h>
29#include <asm/machdep.h>
30#include <asm/irq.h>
31#include <asm/pmac_feature.h>
32#include <asm/mmu_context.h>
33#include <asm/sections.h>
34#include <asm/cputable.h>
35#include <asm/time.h>
36#include <asm/system.h>
37#include <asm/mpic.h>
38#include <asm/keylargo.h>
39
40/* WARNING !!! This will cause calibrate_delay() to be called,
41 * but this is an __init function ! So you MUST go edit
42 * init/main.c to make it non-init before enabling DEBUG_FREQ
43 */
44#undef DEBUG_FREQ
45
Paul Mackerras14cf11a2005-09-26 16:04:21 +100046extern void low_choose_7447a_dfs(int dfs);
47extern void low_choose_750fx_pll(int pll);
48extern void low_sleep_handler(void);
49
50/*
51 * Currently, PowerMac cpufreq supports only high & low frequencies
52 * that are set by the firmware
53 */
54static unsigned int low_freq;
55static unsigned int hi_freq;
56static unsigned int cur_freq;
57static unsigned int sleep_freq;
58
59/*
Adrian Bunkb3c2ffd2006-06-30 18:20:44 +020060 * Different models uses different mechanisms to switch the frequency
Paul Mackerras14cf11a2005-09-26 16:04:21 +100061 */
62static int (*set_speed_proc)(int low_speed);
63static unsigned int (*get_speed_proc)(void);
64
65/*
66 * Some definitions used by the various speedprocs
67 */
68static u32 voltage_gpio;
69static u32 frequency_gpio;
70static u32 slew_done_gpio;
71static int no_schedule;
72static int has_cpu_l2lve;
73static int is_pmu_based;
74
75/* There are only two frequency states for each processor. Values
76 * are in kHz for the time being.
77 */
78#define CPUFREQ_HIGH 0
79#define CPUFREQ_LOW 1
80
81static struct cpufreq_frequency_table pmac_cpu_freqs[] = {
82 {CPUFREQ_HIGH, 0},
83 {CPUFREQ_LOW, 0},
84 {0, CPUFREQ_TABLE_END},
85};
86
87static struct freq_attr* pmac_cpu_freqs_attr[] = {
88 &cpufreq_freq_attr_scaling_available_freqs,
89 NULL,
90};
91
92static inline void local_delay(unsigned long ms)
93{
94 if (no_schedule)
95 mdelay(ms);
96 else
97 msleep(ms);
98}
99
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000100#ifdef DEBUG_FREQ
101static inline void debug_calc_bogomips(void)
102{
103 /* This will cause a recalc of bogomips and display the
104 * result. We backup/restore the value to avoid affecting the
105 * core cpufreq framework's own calculation.
106 */
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000107 unsigned long save_lpj = loops_per_jiffy;
108 calibrate_delay();
109 loops_per_jiffy = save_lpj;
110}
111#endif /* DEBUG_FREQ */
112
113/* Switch CPU speed under 750FX CPU control
114 */
115static int cpu_750fx_cpu_speed(int low_speed)
116{
117 u32 hid2;
118
119 if (low_speed == 0) {
120 /* ramping up, set voltage first */
121 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
122 /* Make sure we sleep for at least 1ms */
123 local_delay(10);
124
125 /* tweak L2 for high voltage */
126 if (has_cpu_l2lve) {
127 hid2 = mfspr(SPRN_HID2);
128 hid2 &= ~0x2000;
129 mtspr(SPRN_HID2, hid2);
130 }
131 }
132#ifdef CONFIG_6xx
133 low_choose_750fx_pll(low_speed);
134#endif
135 if (low_speed == 1) {
136 /* tweak L2 for low voltage */
137 if (has_cpu_l2lve) {
138 hid2 = mfspr(SPRN_HID2);
139 hid2 |= 0x2000;
140 mtspr(SPRN_HID2, hid2);
141 }
142
143 /* ramping down, set voltage last */
144 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
145 local_delay(10);
146 }
147
148 return 0;
149}
150
151static unsigned int cpu_750fx_get_cpu_speed(void)
152{
153 if (mfspr(SPRN_HID1) & HID1_PS)
154 return low_freq;
155 else
156 return hi_freq;
157}
158
159/* Switch CPU speed using DFS */
160static int dfs_set_cpu_speed(int low_speed)
161{
162 if (low_speed == 0) {
163 /* ramping up, set voltage first */
164 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
165 /* Make sure we sleep for at least 1ms */
166 local_delay(1);
167 }
168
169 /* set frequency */
170#ifdef CONFIG_6xx
171 low_choose_7447a_dfs(low_speed);
172#endif
173 udelay(100);
174
175 if (low_speed == 1) {
176 /* ramping down, set voltage last */
177 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
178 local_delay(1);
179 }
180
181 return 0;
182}
183
184static unsigned int dfs_get_cpu_speed(void)
185{
186 if (mfspr(SPRN_HID1) & HID1_DFS)
187 return low_freq;
188 else
189 return hi_freq;
190}
191
192
193/* Switch CPU speed using slewing GPIOs
194 */
195static int gpios_set_cpu_speed(int low_speed)
196{
197 int gpio, timeout = 0;
198
199 /* If ramping up, set voltage first */
200 if (low_speed == 0) {
201 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
202 /* Delay is way too big but it's ok, we schedule */
203 local_delay(10);
204 }
205
206 /* Set frequency */
207 gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0);
208 if (low_speed == ((gpio & 0x01) == 0))
209 goto skip;
210
211 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, frequency_gpio,
212 low_speed ? 0x04 : 0x05);
213 udelay(200);
214 do {
215 if (++timeout > 100)
216 break;
217 local_delay(1);
218 gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, slew_done_gpio, 0);
219 } while((gpio & 0x02) == 0);
220 skip:
221 /* If ramping down, set voltage last */
222 if (low_speed == 1) {
223 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
224 /* Delay is way too big but it's ok, we schedule */
225 local_delay(10);
226 }
227
228#ifdef DEBUG_FREQ
229 debug_calc_bogomips();
230#endif
231
232 return 0;
233}
234
235/* Switch CPU speed under PMU control
236 */
237static int pmu_set_cpu_speed(int low_speed)
238{
239 struct adb_request req;
240 unsigned long save_l2cr;
241 unsigned long save_l3cr;
242 unsigned int pic_prio;
243 unsigned long flags;
244
245 preempt_disable();
246
247#ifdef DEBUG_FREQ
248 printk(KERN_DEBUG "HID1, before: %x\n", mfspr(SPRN_HID1));
249#endif
250 pmu_suspend();
251
252 /* Disable all interrupt sources on openpic */
253 pic_prio = mpic_cpu_get_priority();
254 mpic_cpu_set_priority(0xf);
255
256 /* Make sure the decrementer won't interrupt us */
257 asm volatile("mtdec %0" : : "r" (0x7fffffff));
Adrian Bunk80f72282006-06-30 18:27:16 +0200258 /* Make sure any pending DEC interrupt occurring while we did
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000259 * the above didn't re-enable the DEC */
260 mb();
261 asm volatile("mtdec %0" : : "r" (0x7fffffff));
262
263 /* We can now disable MSR_EE */
264 local_irq_save(flags);
265
266 /* Giveup the FPU & vec */
267 enable_kernel_fp();
268
269#ifdef CONFIG_ALTIVEC
270 if (cpu_has_feature(CPU_FTR_ALTIVEC))
271 enable_kernel_altivec();
272#endif /* CONFIG_ALTIVEC */
273
274 /* Save & disable L2 and L3 caches */
275 save_l3cr = _get_L3CR(); /* (returns -1 if not available) */
276 save_l2cr = _get_L2CR(); /* (returns -1 if not available) */
277
278 /* Send the new speed command. My assumption is that this command
279 * will cause PLL_CFG[0..3] to be changed next time CPU goes to sleep
280 */
281 pmu_request(&req, NULL, 6, PMU_CPU_SPEED, 'W', 'O', 'O', 'F', low_speed);
282 while (!req.complete)
283 pmu_poll();
284
285 /* Prepare the northbridge for the speed transition */
286 pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,1);
287
288 /* Call low level code to backup CPU state and recover from
289 * hardware reset
290 */
291 low_sleep_handler();
292
293 /* Restore the northbridge */
294 pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,0);
295
296 /* Restore L2 cache */
297 if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0)
298 _set_L2CR(save_l2cr);
299 /* Restore L3 cache */
300 if (save_l3cr != 0xffffffff && (save_l3cr & L3CR_L3E) != 0)
301 _set_L3CR(save_l3cr);
302
303 /* Restore userland MMU context */
Benjamin Herrenschmidt5e696612008-12-18 19:13:24 +0000304 switch_mmu_context(NULL, current->active_mm);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000305
306#ifdef DEBUG_FREQ
307 printk(KERN_DEBUG "HID1, after: %x\n", mfspr(SPRN_HID1));
308#endif
309
310 /* Restore low level PMU operations */
311 pmu_unlock();
312
Paul Mackerrasc1aa6872010-06-20 19:04:14 +0000313 /*
314 * Restore decrementer; we'll take a decrementer interrupt
315 * as soon as interrupts are re-enabled and the generic
316 * clockevents code will reprogram it with the right value.
317 */
318 set_dec(1);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000319
320 /* Restore interrupts */
321 mpic_cpu_set_priority(pic_prio);
322
323 /* Let interrupts flow again ... */
324 local_irq_restore(flags);
325
326#ifdef DEBUG_FREQ
327 debug_calc_bogomips();
328#endif
329
330 pmu_resume();
331
332 preempt_enable();
333
334 return 0;
335}
336
337static int do_set_cpu_speed(int speed_mode, int notify)
338{
339 struct cpufreq_freqs freqs;
340 unsigned long l3cr;
341 static unsigned long prev_l3cr;
342
343 freqs.old = cur_freq;
344 freqs.new = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq;
345 freqs.cpu = smp_processor_id();
346
347 if (freqs.old == freqs.new)
348 return 0;
349
350 if (notify)
351 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
352 if (speed_mode == CPUFREQ_LOW &&
353 cpu_has_feature(CPU_FTR_L3CR)) {
354 l3cr = _get_L3CR();
355 if (l3cr & L3CR_L3E) {
356 prev_l3cr = l3cr;
357 _set_L3CR(0);
358 }
359 }
360 set_speed_proc(speed_mode == CPUFREQ_LOW);
361 if (speed_mode == CPUFREQ_HIGH &&
362 cpu_has_feature(CPU_FTR_L3CR)) {
363 l3cr = _get_L3CR();
364 if ((prev_l3cr & L3CR_L3E) && l3cr != prev_l3cr)
365 _set_L3CR(prev_l3cr);
366 }
367 if (notify)
368 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
369 cur_freq = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq;
370
371 return 0;
372}
373
374static unsigned int pmac_cpufreq_get_speed(unsigned int cpu)
375{
376 return cur_freq;
377}
378
379static int pmac_cpufreq_verify(struct cpufreq_policy *policy)
380{
381 return cpufreq_frequency_table_verify(policy, pmac_cpu_freqs);
382}
383
384static int pmac_cpufreq_target( struct cpufreq_policy *policy,
385 unsigned int target_freq,
386 unsigned int relation)
387{
388 unsigned int newstate = 0;
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100389 int rc;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000390
391 if (cpufreq_frequency_table_target(policy, pmac_cpu_freqs,
392 target_freq, relation, &newstate))
393 return -EINVAL;
394
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100395 rc = do_set_cpu_speed(newstate, 1);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000396
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100397 ppc_proc_freq = cur_freq * 1000ul;
398 return rc;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000399}
400
401static int pmac_cpufreq_cpu_init(struct cpufreq_policy *policy)
402{
403 if (policy->cpu != 0)
404 return -ENODEV;
405
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000406 policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
407 policy->cur = cur_freq;
408
409 cpufreq_frequency_table_get_attr(pmac_cpu_freqs, policy->cpu);
410 return cpufreq_frequency_table_cpuinfo(policy, pmac_cpu_freqs);
411}
412
413static u32 read_gpio(struct device_node *np)
414{
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000415 const u32 *reg = of_get_property(np, "reg", NULL);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000416 u32 offset;
417
418 if (reg == NULL)
419 return 0;
420 /* That works for all keylargos but shall be fixed properly
421 * some day... The problem is that it seems we can't rely
422 * on the "reg" property of the GPIO nodes, they are either
423 * relative to the base of KeyLargo or to the base of the
424 * GPIO space, and the device-tree doesn't help.
425 */
426 offset = *reg;
427 if (offset < KEYLARGO_GPIO_LEVELS0)
428 offset += KEYLARGO_GPIO_LEVELS0;
429 return offset;
430}
431
Rafael J. Wysocki7ca64e22011-03-10 21:13:05 +0100432static int pmac_cpufreq_suspend(struct cpufreq_policy *policy)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000433{
434 /* Ok, this could be made a bit smarter, but let's be robust for now. We
435 * always force a speed change to high speed before sleep, to make sure
436 * we have appropriate voltage and/or bus speed for the wakeup process,
437 * and to make sure our loops_per_jiffies are "good enough", that is will
438 * not cause too short delays if we sleep in low speed and wake in high
439 * speed..
440 */
441 no_schedule = 1;
442 sleep_freq = cur_freq;
443 if (cur_freq == low_freq && !is_pmu_based)
444 do_set_cpu_speed(CPUFREQ_HIGH, 0);
445 return 0;
446}
447
448static int pmac_cpufreq_resume(struct cpufreq_policy *policy)
449{
450 /* If we resume, first check if we have a get() function */
451 if (get_speed_proc)
452 cur_freq = get_speed_proc();
Paul Mackerras22358ea2005-11-08 12:13:38 +1100453 else
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000454 cur_freq = 0;
455
456 /* We don't, hrm... we don't really know our speed here, best
457 * is that we force a switch to whatever it was, which is
458 * probably high speed due to our suspend() routine
459 */
460 do_set_cpu_speed(sleep_freq == low_freq ?
461 CPUFREQ_LOW : CPUFREQ_HIGH, 0);
462
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100463 ppc_proc_freq = cur_freq * 1000ul;
464
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000465 no_schedule = 0;
466 return 0;
467}
468
469static struct cpufreq_driver pmac_cpufreq_driver = {
470 .verify = pmac_cpufreq_verify,
471 .target = pmac_cpufreq_target,
472 .get = pmac_cpufreq_get_speed,
473 .init = pmac_cpufreq_cpu_init,
474 .suspend = pmac_cpufreq_suspend,
475 .resume = pmac_cpufreq_resume,
476 .flags = CPUFREQ_PM_NO_WARN,
477 .attr = pmac_cpu_freqs_attr,
478 .name = "powermac",
479 .owner = THIS_MODULE,
480};
481
482
483static int pmac_cpufreq_init_MacRISC3(struct device_node *cpunode)
484{
485 struct device_node *volt_gpio_np = of_find_node_by_name(NULL,
486 "voltage-gpio");
487 struct device_node *freq_gpio_np = of_find_node_by_name(NULL,
488 "frequency-gpio");
489 struct device_node *slew_done_gpio_np = of_find_node_by_name(NULL,
490 "slewing-done");
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000491 const u32 *value;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000492
493 /*
494 * Check to see if it's GPIO driven or PMU only
495 *
496 * The way we extract the GPIO address is slightly hackish, but it
497 * works well enough for now. We need to abstract the whole GPIO
498 * stuff sooner or later anyway
499 */
500
501 if (volt_gpio_np)
502 voltage_gpio = read_gpio(volt_gpio_np);
503 if (freq_gpio_np)
504 frequency_gpio = read_gpio(freq_gpio_np);
505 if (slew_done_gpio_np)
506 slew_done_gpio = read_gpio(slew_done_gpio_np);
507
508 /* If we use the frequency GPIOs, calculate the min/max speeds based
509 * on the bus frequencies
510 */
511 if (frequency_gpio && slew_done_gpio) {
512 int lenp, rc;
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000513 const u32 *freqs, *ratio;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000514
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000515 freqs = of_get_property(cpunode, "bus-frequencies", &lenp);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000516 lenp /= sizeof(u32);
517 if (freqs == NULL || lenp != 2) {
518 printk(KERN_ERR "cpufreq: bus-frequencies incorrect or missing\n");
519 return 1;
520 }
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000521 ratio = of_get_property(cpunode, "processor-to-bus-ratio*2",
522 NULL);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000523 if (ratio == NULL) {
524 printk(KERN_ERR "cpufreq: processor-to-bus-ratio*2 missing\n");
525 return 1;
526 }
527
528 /* Get the min/max bus frequencies */
529 low_freq = min(freqs[0], freqs[1]);
530 hi_freq = max(freqs[0], freqs[1]);
531
532 /* Grrrr.. It _seems_ that the device-tree is lying on the low bus
533 * frequency, it claims it to be around 84Mhz on some models while
534 * it appears to be approx. 101Mhz on all. Let's hack around here...
535 * fortunately, we don't need to be too precise
536 */
537 if (low_freq < 98000000)
538 low_freq = 101000000;
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100539
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000540 /* Convert those to CPU core clocks */
541 low_freq = (low_freq * (*ratio)) / 2000;
542 hi_freq = (hi_freq * (*ratio)) / 2000;
543
544 /* Now we get the frequencies, we read the GPIO to see what is out current
545 * speed
546 */
547 rc = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0);
548 cur_freq = (rc & 0x01) ? hi_freq : low_freq;
549
550 set_speed_proc = gpios_set_cpu_speed;
551 return 1;
552 }
553
554 /* If we use the PMU, look for the min & max frequencies in the
555 * device-tree
556 */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000557 value = of_get_property(cpunode, "min-clock-frequency", NULL);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000558 if (!value)
559 return 1;
560 low_freq = (*value) / 1000;
561 /* The PowerBook G4 12" (PowerBook6,1) has an error in the device-tree
562 * here */
563 if (low_freq < 100000)
564 low_freq *= 10;
565
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000566 value = of_get_property(cpunode, "max-clock-frequency", NULL);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000567 if (!value)
568 return 1;
569 hi_freq = (*value) / 1000;
570 set_speed_proc = pmu_set_cpu_speed;
571 is_pmu_based = 1;
572
573 return 0;
574}
575
576static int pmac_cpufreq_init_7447A(struct device_node *cpunode)
577{
578 struct device_node *volt_gpio_np;
579
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000580 if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000581 return 1;
582
583 volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
584 if (volt_gpio_np)
585 voltage_gpio = read_gpio(volt_gpio_np);
586 if (!voltage_gpio){
587 printk(KERN_ERR "cpufreq: missing cpu-vcore-select gpio\n");
588 return 1;
589 }
590
591 /* OF only reports the high frequency */
592 hi_freq = cur_freq;
593 low_freq = cur_freq/2;
594
595 /* Read actual frequency from CPU */
596 cur_freq = dfs_get_cpu_speed();
597 set_speed_proc = dfs_set_cpu_speed;
598 get_speed_proc = dfs_get_cpu_speed;
599
600 return 0;
601}
602
603static int pmac_cpufreq_init_750FX(struct device_node *cpunode)
604{
605 struct device_node *volt_gpio_np;
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000606 u32 pvr;
607 const u32 *value;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000608
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000609 if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000610 return 1;
611
612 hi_freq = cur_freq;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000613 value = of_get_property(cpunode, "reduced-clock-frequency", NULL);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000614 if (!value)
615 return 1;
616 low_freq = (*value) / 1000;
617
618 volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
619 if (volt_gpio_np)
620 voltage_gpio = read_gpio(volt_gpio_np);
621
622 pvr = mfspr(SPRN_PVR);
623 has_cpu_l2lve = !((pvr & 0xf00) == 0x100);
624
625 set_speed_proc = cpu_750fx_cpu_speed;
626 get_speed_proc = cpu_750fx_get_cpu_speed;
627 cur_freq = cpu_750fx_get_cpu_speed();
628
629 return 0;
630}
631
632/* Currently, we support the following machines:
633 *
634 * - Titanium PowerBook 1Ghz (PMU based, 667Mhz & 1Ghz)
635 * - Titanium PowerBook 800 (PMU based, 667Mhz & 800Mhz)
636 * - Titanium PowerBook 400 (PMU based, 300Mhz & 400Mhz)
637 * - Titanium PowerBook 500 (PMU based, 300Mhz & 500Mhz)
638 * - iBook2 500/600 (PMU based, 400Mhz & 500/600Mhz)
639 * - iBook2 700 (CPU based, 400Mhz & 700Mhz, support low voltage)
640 * - Recent MacRISC3 laptops
641 * - All new machines with 7447A CPUs
642 */
643static int __init pmac_cpufreq_setup(void)
644{
645 struct device_node *cpunode;
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000646 const u32 *value;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000647
648 if (strstr(cmd_line, "nocpufreq"))
649 return 0;
650
651 /* Assume only one CPU */
Stephen Rothwell1658ab62007-04-24 13:51:59 +1000652 cpunode = of_find_node_by_type(NULL, "cpu");
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000653 if (!cpunode)
654 goto out;
655
656 /* Get current cpu clock freq */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000657 value = of_get_property(cpunode, "clock-frequency", NULL);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000658 if (!value)
659 goto out;
660 cur_freq = (*value) / 1000;
661
662 /* Check for 7447A based MacRISC3 */
Grant Likely71a157e2010-02-01 21:34:14 -0700663 if (of_machine_is_compatible("MacRISC3") &&
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000664 of_get_property(cpunode, "dynamic-power-step", NULL) &&
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000665 PVR_VER(mfspr(SPRN_PVR)) == 0x8003) {
666 pmac_cpufreq_init_7447A(cpunode);
667 /* Check for other MacRISC3 machines */
Grant Likely71a157e2010-02-01 21:34:14 -0700668 } else if (of_machine_is_compatible("PowerBook3,4") ||
669 of_machine_is_compatible("PowerBook3,5") ||
670 of_machine_is_compatible("MacRISC3")) {
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000671 pmac_cpufreq_init_MacRISC3(cpunode);
672 /* Else check for iBook2 500/600 */
Grant Likely71a157e2010-02-01 21:34:14 -0700673 } else if (of_machine_is_compatible("PowerBook4,1")) {
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000674 hi_freq = cur_freq;
675 low_freq = 400000;
676 set_speed_proc = pmu_set_cpu_speed;
677 is_pmu_based = 1;
678 }
Paul Mackerras5629d412005-10-12 17:01:50 +1000679 /* Else check for TiPb 550 */
Grant Likely71a157e2010-02-01 21:34:14 -0700680 else if (of_machine_is_compatible("PowerBook3,3") && cur_freq == 550000) {
Paul Mackerras5629d412005-10-12 17:01:50 +1000681 hi_freq = cur_freq;
682 low_freq = 500000;
683 set_speed_proc = pmu_set_cpu_speed;
684 is_pmu_based = 1;
685 }
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000686 /* Else check for TiPb 400 & 500 */
Grant Likely71a157e2010-02-01 21:34:14 -0700687 else if (of_machine_is_compatible("PowerBook3,2")) {
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000688 /* We only know about the 400 MHz and the 500Mhz model
689 * they both have 300 MHz as low frequency
690 */
691 if (cur_freq < 350000 || cur_freq > 550000)
692 goto out;
693 hi_freq = cur_freq;
694 low_freq = 300000;
695 set_speed_proc = pmu_set_cpu_speed;
696 is_pmu_based = 1;
697 }
698 /* Else check for 750FX */
699 else if (PVR_VER(mfspr(SPRN_PVR)) == 0x7000)
700 pmac_cpufreq_init_750FX(cpunode);
701out:
Stephen Rothwell1658ab62007-04-24 13:51:59 +1000702 of_node_put(cpunode);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000703 if (set_speed_proc == NULL)
704 return -ENODEV;
705
706 pmac_cpu_freqs[CPUFREQ_LOW].frequency = low_freq;
707 pmac_cpu_freqs[CPUFREQ_HIGH].frequency = hi_freq;
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100708 ppc_proc_freq = cur_freq * 1000ul;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000709
710 printk(KERN_INFO "Registering PowerMac CPU frequency driver\n");
711 printk(KERN_INFO "Low: %d Mhz, High: %d Mhz, Boot: %d Mhz\n",
712 low_freq/1000, hi_freq/1000, cur_freq/1000);
713
714 return cpufreq_register_driver(&pmac_cpufreq_driver);
715}
716
717module_init(pmac_cpufreq_setup);
718