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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>
24#include <linux/slab.h>
25#include <linux/cpufreq.h>
26#include <linux/init.h>
27#include <linux/sysdev.h>
28#include <linux/i2c.h>
29#include <linux/hardirq.h>
30#include <asm/prom.h>
31#include <asm/machdep.h>
32#include <asm/irq.h>
33#include <asm/pmac_feature.h>
34#include <asm/mmu_context.h>
35#include <asm/sections.h>
36#include <asm/cputable.h>
37#include <asm/time.h>
38#include <asm/system.h>
39#include <asm/mpic.h>
40#include <asm/keylargo.h>
41
42/* WARNING !!! This will cause calibrate_delay() to be called,
43 * but this is an __init function ! So you MUST go edit
44 * init/main.c to make it non-init before enabling DEBUG_FREQ
45 */
46#undef DEBUG_FREQ
47
48/*
49 * There is a problem with the core cpufreq code on SMP kernels,
50 * it won't recalculate the Bogomips properly
51 */
52#ifdef CONFIG_SMP
53#warning "WARNING, CPUFREQ not recommended on SMP kernels"
54#endif
55
56extern void low_choose_7447a_dfs(int dfs);
57extern void low_choose_750fx_pll(int pll);
58extern void low_sleep_handler(void);
59
60/*
61 * Currently, PowerMac cpufreq supports only high & low frequencies
62 * that are set by the firmware
63 */
64static unsigned int low_freq;
65static unsigned int hi_freq;
66static unsigned int cur_freq;
67static unsigned int sleep_freq;
68
69/*
Adrian Bunkb3c2ffd2006-06-30 18:20:44 +020070 * Different models uses different mechanisms to switch the frequency
Paul Mackerras14cf11a2005-09-26 16:04:21 +100071 */
72static int (*set_speed_proc)(int low_speed);
73static unsigned int (*get_speed_proc)(void);
74
75/*
76 * Some definitions used by the various speedprocs
77 */
78static u32 voltage_gpio;
79static u32 frequency_gpio;
80static u32 slew_done_gpio;
81static int no_schedule;
82static int has_cpu_l2lve;
83static int is_pmu_based;
84
85/* There are only two frequency states for each processor. Values
86 * are in kHz for the time being.
87 */
88#define CPUFREQ_HIGH 0
89#define CPUFREQ_LOW 1
90
91static struct cpufreq_frequency_table pmac_cpu_freqs[] = {
92 {CPUFREQ_HIGH, 0},
93 {CPUFREQ_LOW, 0},
94 {0, CPUFREQ_TABLE_END},
95};
96
97static struct freq_attr* pmac_cpu_freqs_attr[] = {
98 &cpufreq_freq_attr_scaling_available_freqs,
99 NULL,
100};
101
102static inline void local_delay(unsigned long ms)
103{
104 if (no_schedule)
105 mdelay(ms);
106 else
107 msleep(ms);
108}
109
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000110#ifdef DEBUG_FREQ
111static inline void debug_calc_bogomips(void)
112{
113 /* This will cause a recalc of bogomips and display the
114 * result. We backup/restore the value to avoid affecting the
115 * core cpufreq framework's own calculation.
116 */
117 extern void calibrate_delay(void);
118
119 unsigned long save_lpj = loops_per_jiffy;
120 calibrate_delay();
121 loops_per_jiffy = save_lpj;
122}
123#endif /* DEBUG_FREQ */
124
125/* Switch CPU speed under 750FX CPU control
126 */
127static int cpu_750fx_cpu_speed(int low_speed)
128{
129 u32 hid2;
130
131 if (low_speed == 0) {
132 /* ramping up, set voltage first */
133 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
134 /* Make sure we sleep for at least 1ms */
135 local_delay(10);
136
137 /* tweak L2 for high voltage */
138 if (has_cpu_l2lve) {
139 hid2 = mfspr(SPRN_HID2);
140 hid2 &= ~0x2000;
141 mtspr(SPRN_HID2, hid2);
142 }
143 }
144#ifdef CONFIG_6xx
145 low_choose_750fx_pll(low_speed);
146#endif
147 if (low_speed == 1) {
148 /* tweak L2 for low voltage */
149 if (has_cpu_l2lve) {
150 hid2 = mfspr(SPRN_HID2);
151 hid2 |= 0x2000;
152 mtspr(SPRN_HID2, hid2);
153 }
154
155 /* ramping down, set voltage last */
156 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
157 local_delay(10);
158 }
159
160 return 0;
161}
162
163static unsigned int cpu_750fx_get_cpu_speed(void)
164{
165 if (mfspr(SPRN_HID1) & HID1_PS)
166 return low_freq;
167 else
168 return hi_freq;
169}
170
171/* Switch CPU speed using DFS */
172static int dfs_set_cpu_speed(int low_speed)
173{
174 if (low_speed == 0) {
175 /* ramping up, set voltage first */
176 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
177 /* Make sure we sleep for at least 1ms */
178 local_delay(1);
179 }
180
181 /* set frequency */
182#ifdef CONFIG_6xx
183 low_choose_7447a_dfs(low_speed);
184#endif
185 udelay(100);
186
187 if (low_speed == 1) {
188 /* ramping down, set voltage last */
189 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
190 local_delay(1);
191 }
192
193 return 0;
194}
195
196static unsigned int dfs_get_cpu_speed(void)
197{
198 if (mfspr(SPRN_HID1) & HID1_DFS)
199 return low_freq;
200 else
201 return hi_freq;
202}
203
204
205/* Switch CPU speed using slewing GPIOs
206 */
207static int gpios_set_cpu_speed(int low_speed)
208{
209 int gpio, timeout = 0;
210
211 /* If ramping up, set voltage first */
212 if (low_speed == 0) {
213 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
214 /* Delay is way too big but it's ok, we schedule */
215 local_delay(10);
216 }
217
218 /* Set frequency */
219 gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0);
220 if (low_speed == ((gpio & 0x01) == 0))
221 goto skip;
222
223 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, frequency_gpio,
224 low_speed ? 0x04 : 0x05);
225 udelay(200);
226 do {
227 if (++timeout > 100)
228 break;
229 local_delay(1);
230 gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, slew_done_gpio, 0);
231 } while((gpio & 0x02) == 0);
232 skip:
233 /* If ramping down, set voltage last */
234 if (low_speed == 1) {
235 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
236 /* Delay is way too big but it's ok, we schedule */
237 local_delay(10);
238 }
239
240#ifdef DEBUG_FREQ
241 debug_calc_bogomips();
242#endif
243
244 return 0;
245}
246
247/* Switch CPU speed under PMU control
248 */
249static int pmu_set_cpu_speed(int low_speed)
250{
251 struct adb_request req;
252 unsigned long save_l2cr;
253 unsigned long save_l3cr;
254 unsigned int pic_prio;
255 unsigned long flags;
256
257 preempt_disable();
258
259#ifdef DEBUG_FREQ
260 printk(KERN_DEBUG "HID1, before: %x\n", mfspr(SPRN_HID1));
261#endif
262 pmu_suspend();
263
264 /* Disable all interrupt sources on openpic */
265 pic_prio = mpic_cpu_get_priority();
266 mpic_cpu_set_priority(0xf);
267
268 /* Make sure the decrementer won't interrupt us */
269 asm volatile("mtdec %0" : : "r" (0x7fffffff));
Adrian Bunk80f72282006-06-30 18:27:16 +0200270 /* Make sure any pending DEC interrupt occurring while we did
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000271 * the above didn't re-enable the DEC */
272 mb();
273 asm volatile("mtdec %0" : : "r" (0x7fffffff));
274
275 /* We can now disable MSR_EE */
276 local_irq_save(flags);
277
278 /* Giveup the FPU & vec */
279 enable_kernel_fp();
280
281#ifdef CONFIG_ALTIVEC
282 if (cpu_has_feature(CPU_FTR_ALTIVEC))
283 enable_kernel_altivec();
284#endif /* CONFIG_ALTIVEC */
285
286 /* Save & disable L2 and L3 caches */
287 save_l3cr = _get_L3CR(); /* (returns -1 if not available) */
288 save_l2cr = _get_L2CR(); /* (returns -1 if not available) */
289
290 /* Send the new speed command. My assumption is that this command
291 * will cause PLL_CFG[0..3] to be changed next time CPU goes to sleep
292 */
293 pmu_request(&req, NULL, 6, PMU_CPU_SPEED, 'W', 'O', 'O', 'F', low_speed);
294 while (!req.complete)
295 pmu_poll();
296
297 /* Prepare the northbridge for the speed transition */
298 pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,1);
299
300 /* Call low level code to backup CPU state and recover from
301 * hardware reset
302 */
303 low_sleep_handler();
304
305 /* Restore the northbridge */
306 pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,0);
307
308 /* Restore L2 cache */
309 if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0)
310 _set_L2CR(save_l2cr);
311 /* Restore L3 cache */
312 if (save_l3cr != 0xffffffff && (save_l3cr & L3CR_L3E) != 0)
313 _set_L3CR(save_l3cr);
314
315 /* Restore userland MMU context */
Paul Mackerras6218a762006-06-11 14:15:17 +1000316 set_context(current->active_mm->context.id, current->active_mm->pgd);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000317
318#ifdef DEBUG_FREQ
319 printk(KERN_DEBUG "HID1, after: %x\n", mfspr(SPRN_HID1));
320#endif
321
322 /* Restore low level PMU operations */
323 pmu_unlock();
324
325 /* Restore decrementer */
326 wakeup_decrementer();
327
328 /* Restore interrupts */
329 mpic_cpu_set_priority(pic_prio);
330
331 /* Let interrupts flow again ... */
332 local_irq_restore(flags);
333
334#ifdef DEBUG_FREQ
335 debug_calc_bogomips();
336#endif
337
338 pmu_resume();
339
340 preempt_enable();
341
342 return 0;
343}
344
345static int do_set_cpu_speed(int speed_mode, int notify)
346{
347 struct cpufreq_freqs freqs;
348 unsigned long l3cr;
349 static unsigned long prev_l3cr;
350
351 freqs.old = cur_freq;
352 freqs.new = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq;
353 freqs.cpu = smp_processor_id();
354
355 if (freqs.old == freqs.new)
356 return 0;
357
358 if (notify)
359 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
360 if (speed_mode == CPUFREQ_LOW &&
361 cpu_has_feature(CPU_FTR_L3CR)) {
362 l3cr = _get_L3CR();
363 if (l3cr & L3CR_L3E) {
364 prev_l3cr = l3cr;
365 _set_L3CR(0);
366 }
367 }
368 set_speed_proc(speed_mode == CPUFREQ_LOW);
369 if (speed_mode == CPUFREQ_HIGH &&
370 cpu_has_feature(CPU_FTR_L3CR)) {
371 l3cr = _get_L3CR();
372 if ((prev_l3cr & L3CR_L3E) && l3cr != prev_l3cr)
373 _set_L3CR(prev_l3cr);
374 }
375 if (notify)
376 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
377 cur_freq = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq;
378
379 return 0;
380}
381
382static unsigned int pmac_cpufreq_get_speed(unsigned int cpu)
383{
384 return cur_freq;
385}
386
387static int pmac_cpufreq_verify(struct cpufreq_policy *policy)
388{
389 return cpufreq_frequency_table_verify(policy, pmac_cpu_freqs);
390}
391
392static int pmac_cpufreq_target( struct cpufreq_policy *policy,
393 unsigned int target_freq,
394 unsigned int relation)
395{
396 unsigned int newstate = 0;
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100397 int rc;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000398
399 if (cpufreq_frequency_table_target(policy, pmac_cpu_freqs,
400 target_freq, relation, &newstate))
401 return -EINVAL;
402
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100403 rc = do_set_cpu_speed(newstate, 1);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000404
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100405 ppc_proc_freq = cur_freq * 1000ul;
406 return rc;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000407}
408
409static int pmac_cpufreq_cpu_init(struct cpufreq_policy *policy)
410{
411 if (policy->cpu != 0)
412 return -ENODEV;
413
414 policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
415 policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
416 policy->cur = cur_freq;
417
418 cpufreq_frequency_table_get_attr(pmac_cpu_freqs, policy->cpu);
419 return cpufreq_frequency_table_cpuinfo(policy, pmac_cpu_freqs);
420}
421
422static u32 read_gpio(struct device_node *np)
423{
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000424 const u32 *reg = of_get_property(np, "reg", NULL);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000425 u32 offset;
426
427 if (reg == NULL)
428 return 0;
429 /* That works for all keylargos but shall be fixed properly
430 * some day... The problem is that it seems we can't rely
431 * on the "reg" property of the GPIO nodes, they are either
432 * relative to the base of KeyLargo or to the base of the
433 * GPIO space, and the device-tree doesn't help.
434 */
435 offset = *reg;
436 if (offset < KEYLARGO_GPIO_LEVELS0)
437 offset += KEYLARGO_GPIO_LEVELS0;
438 return offset;
439}
440
441static int pmac_cpufreq_suspend(struct cpufreq_policy *policy, pm_message_t pmsg)
442{
443 /* Ok, this could be made a bit smarter, but let's be robust for now. We
444 * always force a speed change to high speed before sleep, to make sure
445 * we have appropriate voltage and/or bus speed for the wakeup process,
446 * and to make sure our loops_per_jiffies are "good enough", that is will
447 * not cause too short delays if we sleep in low speed and wake in high
448 * speed..
449 */
450 no_schedule = 1;
451 sleep_freq = cur_freq;
452 if (cur_freq == low_freq && !is_pmu_based)
453 do_set_cpu_speed(CPUFREQ_HIGH, 0);
454 return 0;
455}
456
457static int pmac_cpufreq_resume(struct cpufreq_policy *policy)
458{
459 /* If we resume, first check if we have a get() function */
460 if (get_speed_proc)
461 cur_freq = get_speed_proc();
Paul Mackerras22358ea2005-11-08 12:13:38 +1100462 else
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000463 cur_freq = 0;
464
465 /* We don't, hrm... we don't really know our speed here, best
466 * is that we force a switch to whatever it was, which is
467 * probably high speed due to our suspend() routine
468 */
469 do_set_cpu_speed(sleep_freq == low_freq ?
470 CPUFREQ_LOW : CPUFREQ_HIGH, 0);
471
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100472 ppc_proc_freq = cur_freq * 1000ul;
473
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000474 no_schedule = 0;
475 return 0;
476}
477
478static struct cpufreq_driver pmac_cpufreq_driver = {
479 .verify = pmac_cpufreq_verify,
480 .target = pmac_cpufreq_target,
481 .get = pmac_cpufreq_get_speed,
482 .init = pmac_cpufreq_cpu_init,
483 .suspend = pmac_cpufreq_suspend,
484 .resume = pmac_cpufreq_resume,
485 .flags = CPUFREQ_PM_NO_WARN,
486 .attr = pmac_cpu_freqs_attr,
487 .name = "powermac",
488 .owner = THIS_MODULE,
489};
490
491
492static int pmac_cpufreq_init_MacRISC3(struct device_node *cpunode)
493{
494 struct device_node *volt_gpio_np = of_find_node_by_name(NULL,
495 "voltage-gpio");
496 struct device_node *freq_gpio_np = of_find_node_by_name(NULL,
497 "frequency-gpio");
498 struct device_node *slew_done_gpio_np = of_find_node_by_name(NULL,
499 "slewing-done");
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000500 const u32 *value;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000501
502 /*
503 * Check to see if it's GPIO driven or PMU only
504 *
505 * The way we extract the GPIO address is slightly hackish, but it
506 * works well enough for now. We need to abstract the whole GPIO
507 * stuff sooner or later anyway
508 */
509
510 if (volt_gpio_np)
511 voltage_gpio = read_gpio(volt_gpio_np);
512 if (freq_gpio_np)
513 frequency_gpio = read_gpio(freq_gpio_np);
514 if (slew_done_gpio_np)
515 slew_done_gpio = read_gpio(slew_done_gpio_np);
516
517 /* If we use the frequency GPIOs, calculate the min/max speeds based
518 * on the bus frequencies
519 */
520 if (frequency_gpio && slew_done_gpio) {
521 int lenp, rc;
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000522 const u32 *freqs, *ratio;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000523
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000524 freqs = of_get_property(cpunode, "bus-frequencies", &lenp);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000525 lenp /= sizeof(u32);
526 if (freqs == NULL || lenp != 2) {
527 printk(KERN_ERR "cpufreq: bus-frequencies incorrect or missing\n");
528 return 1;
529 }
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000530 ratio = of_get_property(cpunode, "processor-to-bus-ratio*2",
531 NULL);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000532 if (ratio == NULL) {
533 printk(KERN_ERR "cpufreq: processor-to-bus-ratio*2 missing\n");
534 return 1;
535 }
536
537 /* Get the min/max bus frequencies */
538 low_freq = min(freqs[0], freqs[1]);
539 hi_freq = max(freqs[0], freqs[1]);
540
541 /* Grrrr.. It _seems_ that the device-tree is lying on the low bus
542 * frequency, it claims it to be around 84Mhz on some models while
543 * it appears to be approx. 101Mhz on all. Let's hack around here...
544 * fortunately, we don't need to be too precise
545 */
546 if (low_freq < 98000000)
547 low_freq = 101000000;
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100548
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000549 /* Convert those to CPU core clocks */
550 low_freq = (low_freq * (*ratio)) / 2000;
551 hi_freq = (hi_freq * (*ratio)) / 2000;
552
553 /* Now we get the frequencies, we read the GPIO to see what is out current
554 * speed
555 */
556 rc = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0);
557 cur_freq = (rc & 0x01) ? hi_freq : low_freq;
558
559 set_speed_proc = gpios_set_cpu_speed;
560 return 1;
561 }
562
563 /* If we use the PMU, look for the min & max frequencies in the
564 * device-tree
565 */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000566 value = of_get_property(cpunode, "min-clock-frequency", NULL);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000567 if (!value)
568 return 1;
569 low_freq = (*value) / 1000;
570 /* The PowerBook G4 12" (PowerBook6,1) has an error in the device-tree
571 * here */
572 if (low_freq < 100000)
573 low_freq *= 10;
574
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000575 value = of_get_property(cpunode, "max-clock-frequency", NULL);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000576 if (!value)
577 return 1;
578 hi_freq = (*value) / 1000;
579 set_speed_proc = pmu_set_cpu_speed;
580 is_pmu_based = 1;
581
582 return 0;
583}
584
585static int pmac_cpufreq_init_7447A(struct device_node *cpunode)
586{
587 struct device_node *volt_gpio_np;
588
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000589 if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000590 return 1;
591
592 volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
593 if (volt_gpio_np)
594 voltage_gpio = read_gpio(volt_gpio_np);
595 if (!voltage_gpio){
596 printk(KERN_ERR "cpufreq: missing cpu-vcore-select gpio\n");
597 return 1;
598 }
599
600 /* OF only reports the high frequency */
601 hi_freq = cur_freq;
602 low_freq = cur_freq/2;
603
604 /* Read actual frequency from CPU */
605 cur_freq = dfs_get_cpu_speed();
606 set_speed_proc = dfs_set_cpu_speed;
607 get_speed_proc = dfs_get_cpu_speed;
608
609 return 0;
610}
611
612static int pmac_cpufreq_init_750FX(struct device_node *cpunode)
613{
614 struct device_node *volt_gpio_np;
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000615 u32 pvr;
616 const u32 *value;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000617
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000618 if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000619 return 1;
620
621 hi_freq = cur_freq;
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000622 value = of_get_property(cpunode, "reduced-clock-frequency", NULL);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000623 if (!value)
624 return 1;
625 low_freq = (*value) / 1000;
626
627 volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
628 if (volt_gpio_np)
629 voltage_gpio = read_gpio(volt_gpio_np);
630
631 pvr = mfspr(SPRN_PVR);
632 has_cpu_l2lve = !((pvr & 0xf00) == 0x100);
633
634 set_speed_proc = cpu_750fx_cpu_speed;
635 get_speed_proc = cpu_750fx_get_cpu_speed;
636 cur_freq = cpu_750fx_get_cpu_speed();
637
638 return 0;
639}
640
641/* Currently, we support the following machines:
642 *
643 * - Titanium PowerBook 1Ghz (PMU based, 667Mhz & 1Ghz)
644 * - Titanium PowerBook 800 (PMU based, 667Mhz & 800Mhz)
645 * - Titanium PowerBook 400 (PMU based, 300Mhz & 400Mhz)
646 * - Titanium PowerBook 500 (PMU based, 300Mhz & 500Mhz)
647 * - iBook2 500/600 (PMU based, 400Mhz & 500/600Mhz)
648 * - iBook2 700 (CPU based, 400Mhz & 700Mhz, support low voltage)
649 * - Recent MacRISC3 laptops
650 * - All new machines with 7447A CPUs
651 */
652static int __init pmac_cpufreq_setup(void)
653{
654 struct device_node *cpunode;
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000655 const u32 *value;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000656
657 if (strstr(cmd_line, "nocpufreq"))
658 return 0;
659
660 /* Assume only one CPU */
661 cpunode = find_type_devices("cpu");
662 if (!cpunode)
663 goto out;
664
665 /* Get current cpu clock freq */
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000666 value = of_get_property(cpunode, "clock-frequency", NULL);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000667 if (!value)
668 goto out;
669 cur_freq = (*value) / 1000;
670
671 /* Check for 7447A based MacRISC3 */
672 if (machine_is_compatible("MacRISC3") &&
Stephen Rothwelle2eb6392007-04-03 22:26:41 +1000673 of_get_property(cpunode, "dynamic-power-step", NULL) &&
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000674 PVR_VER(mfspr(SPRN_PVR)) == 0x8003) {
675 pmac_cpufreq_init_7447A(cpunode);
676 /* Check for other MacRISC3 machines */
677 } else if (machine_is_compatible("PowerBook3,4") ||
678 machine_is_compatible("PowerBook3,5") ||
679 machine_is_compatible("MacRISC3")) {
680 pmac_cpufreq_init_MacRISC3(cpunode);
681 /* Else check for iBook2 500/600 */
682 } else if (machine_is_compatible("PowerBook4,1")) {
683 hi_freq = cur_freq;
684 low_freq = 400000;
685 set_speed_proc = pmu_set_cpu_speed;
686 is_pmu_based = 1;
687 }
Paul Mackerras5629d412005-10-12 17:01:50 +1000688 /* Else check for TiPb 550 */
689 else if (machine_is_compatible("PowerBook3,3") && cur_freq == 550000) {
690 hi_freq = cur_freq;
691 low_freq = 500000;
692 set_speed_proc = pmu_set_cpu_speed;
693 is_pmu_based = 1;
694 }
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000695 /* Else check for TiPb 400 & 500 */
696 else if (machine_is_compatible("PowerBook3,2")) {
697 /* We only know about the 400 MHz and the 500Mhz model
698 * they both have 300 MHz as low frequency
699 */
700 if (cur_freq < 350000 || cur_freq > 550000)
701 goto out;
702 hi_freq = cur_freq;
703 low_freq = 300000;
704 set_speed_proc = pmu_set_cpu_speed;
705 is_pmu_based = 1;
706 }
707 /* Else check for 750FX */
708 else if (PVR_VER(mfspr(SPRN_PVR)) == 0x7000)
709 pmac_cpufreq_init_750FX(cpunode);
710out:
711 if (set_speed_proc == NULL)
712 return -ENODEV;
713
714 pmac_cpu_freqs[CPUFREQ_LOW].frequency = low_freq;
715 pmac_cpu_freqs[CPUFREQ_HIGH].frequency = hi_freq;
Benjamin Herrenschmidt43501472005-11-07 14:27:33 +1100716 ppc_proc_freq = cur_freq * 1000ul;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000717
718 printk(KERN_INFO "Registering PowerMac CPU frequency driver\n");
719 printk(KERN_INFO "Low: %d Mhz, High: %d Mhz, Boot: %d Mhz\n",
720 low_freq/1000, hi_freq/1000, cur_freq/1000);
721
722 return cpufreq_register_driver(&pmac_cpufreq_driver);
723}
724
725module_init(pmac_cpufreq_setup);
726