]>
Commit | Line | Data |
---|---|---|
14cf11af PM |
1 | /* |
2 | * arch/ppc/platforms/pmac_cpufreq.c | |
3 | * | |
4 | * Copyright (C) 2002 - 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org> | |
5 | * Copyright (C) 2004 John Steele Scott <toojays@toojays.net> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * TODO: Need a big cleanup here. Basically, we need to have different | |
12 | * cpufreq_driver structures for the different type of HW instead of the | |
13 | * current mess. We also need to better deal with the detection of the | |
14 | * type of machine. | |
15 | * | |
16 | */ | |
17 | ||
18 | #include <linux/config.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/adb.h> | |
26 | #include <linux/pmu.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/cpufreq.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/sysdev.h> | |
31 | #include <linux/i2c.h> | |
32 | #include <linux/hardirq.h> | |
33 | #include <asm/prom.h> | |
34 | #include <asm/machdep.h> | |
35 | #include <asm/irq.h> | |
36 | #include <asm/pmac_feature.h> | |
37 | #include <asm/mmu_context.h> | |
38 | #include <asm/sections.h> | |
39 | #include <asm/cputable.h> | |
40 | #include <asm/time.h> | |
41 | #include <asm/system.h> | |
42 | #include <asm/mpic.h> | |
43 | #include <asm/keylargo.h> | |
44 | ||
45 | /* WARNING !!! This will cause calibrate_delay() to be called, | |
46 | * but this is an __init function ! So you MUST go edit | |
47 | * init/main.c to make it non-init before enabling DEBUG_FREQ | |
48 | */ | |
49 | #undef DEBUG_FREQ | |
50 | ||
51 | /* | |
52 | * There is a problem with the core cpufreq code on SMP kernels, | |
53 | * it won't recalculate the Bogomips properly | |
54 | */ | |
55 | #ifdef CONFIG_SMP | |
56 | #warning "WARNING, CPUFREQ not recommended on SMP kernels" | |
57 | #endif | |
58 | ||
59 | extern void low_choose_7447a_dfs(int dfs); | |
60 | extern void low_choose_750fx_pll(int pll); | |
61 | extern void low_sleep_handler(void); | |
62 | ||
63 | /* | |
64 | * Currently, PowerMac cpufreq supports only high & low frequencies | |
65 | * that are set by the firmware | |
66 | */ | |
67 | static unsigned int low_freq; | |
68 | static unsigned int hi_freq; | |
69 | static unsigned int cur_freq; | |
70 | static unsigned int sleep_freq; | |
71 | ||
72 | /* | |
73 | * Different models uses different mecanisms to switch the frequency | |
74 | */ | |
75 | static int (*set_speed_proc)(int low_speed); | |
76 | static unsigned int (*get_speed_proc)(void); | |
77 | ||
78 | /* | |
79 | * Some definitions used by the various speedprocs | |
80 | */ | |
81 | static u32 voltage_gpio; | |
82 | static u32 frequency_gpio; | |
83 | static u32 slew_done_gpio; | |
84 | static int no_schedule; | |
85 | static int has_cpu_l2lve; | |
86 | static int is_pmu_based; | |
87 | ||
88 | /* There are only two frequency states for each processor. Values | |
89 | * are in kHz for the time being. | |
90 | */ | |
91 | #define CPUFREQ_HIGH 0 | |
92 | #define CPUFREQ_LOW 1 | |
93 | ||
94 | static struct cpufreq_frequency_table pmac_cpu_freqs[] = { | |
95 | {CPUFREQ_HIGH, 0}, | |
96 | {CPUFREQ_LOW, 0}, | |
97 | {0, CPUFREQ_TABLE_END}, | |
98 | }; | |
99 | ||
100 | static struct freq_attr* pmac_cpu_freqs_attr[] = { | |
101 | &cpufreq_freq_attr_scaling_available_freqs, | |
102 | NULL, | |
103 | }; | |
104 | ||
105 | static inline void local_delay(unsigned long ms) | |
106 | { | |
107 | if (no_schedule) | |
108 | mdelay(ms); | |
109 | else | |
110 | msleep(ms); | |
111 | } | |
112 | ||
14cf11af PM |
113 | #ifdef DEBUG_FREQ |
114 | static inline void debug_calc_bogomips(void) | |
115 | { | |
116 | /* This will cause a recalc of bogomips and display the | |
117 | * result. We backup/restore the value to avoid affecting the | |
118 | * core cpufreq framework's own calculation. | |
119 | */ | |
120 | extern void calibrate_delay(void); | |
121 | ||
122 | unsigned long save_lpj = loops_per_jiffy; | |
123 | calibrate_delay(); | |
124 | loops_per_jiffy = save_lpj; | |
125 | } | |
126 | #endif /* DEBUG_FREQ */ | |
127 | ||
128 | /* Switch CPU speed under 750FX CPU control | |
129 | */ | |
130 | static int cpu_750fx_cpu_speed(int low_speed) | |
131 | { | |
132 | u32 hid2; | |
133 | ||
134 | if (low_speed == 0) { | |
135 | /* ramping up, set voltage first */ | |
136 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05); | |
137 | /* Make sure we sleep for at least 1ms */ | |
138 | local_delay(10); | |
139 | ||
140 | /* tweak L2 for high voltage */ | |
141 | if (has_cpu_l2lve) { | |
142 | hid2 = mfspr(SPRN_HID2); | |
143 | hid2 &= ~0x2000; | |
144 | mtspr(SPRN_HID2, hid2); | |
145 | } | |
146 | } | |
147 | #ifdef CONFIG_6xx | |
148 | low_choose_750fx_pll(low_speed); | |
149 | #endif | |
150 | if (low_speed == 1) { | |
151 | /* tweak L2 for low voltage */ | |
152 | if (has_cpu_l2lve) { | |
153 | hid2 = mfspr(SPRN_HID2); | |
154 | hid2 |= 0x2000; | |
155 | mtspr(SPRN_HID2, hid2); | |
156 | } | |
157 | ||
158 | /* ramping down, set voltage last */ | |
159 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04); | |
160 | local_delay(10); | |
161 | } | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | static unsigned int cpu_750fx_get_cpu_speed(void) | |
167 | { | |
168 | if (mfspr(SPRN_HID1) & HID1_PS) | |
169 | return low_freq; | |
170 | else | |
171 | return hi_freq; | |
172 | } | |
173 | ||
174 | /* Switch CPU speed using DFS */ | |
175 | static int dfs_set_cpu_speed(int low_speed) | |
176 | { | |
177 | if (low_speed == 0) { | |
178 | /* ramping up, set voltage first */ | |
179 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05); | |
180 | /* Make sure we sleep for at least 1ms */ | |
181 | local_delay(1); | |
182 | } | |
183 | ||
184 | /* set frequency */ | |
185 | #ifdef CONFIG_6xx | |
186 | low_choose_7447a_dfs(low_speed); | |
187 | #endif | |
188 | udelay(100); | |
189 | ||
190 | if (low_speed == 1) { | |
191 | /* ramping down, set voltage last */ | |
192 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04); | |
193 | local_delay(1); | |
194 | } | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static unsigned int dfs_get_cpu_speed(void) | |
200 | { | |
201 | if (mfspr(SPRN_HID1) & HID1_DFS) | |
202 | return low_freq; | |
203 | else | |
204 | return hi_freq; | |
205 | } | |
206 | ||
207 | ||
208 | /* Switch CPU speed using slewing GPIOs | |
209 | */ | |
210 | static int gpios_set_cpu_speed(int low_speed) | |
211 | { | |
212 | int gpio, timeout = 0; | |
213 | ||
214 | /* If ramping up, set voltage first */ | |
215 | if (low_speed == 0) { | |
216 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05); | |
217 | /* Delay is way too big but it's ok, we schedule */ | |
218 | local_delay(10); | |
219 | } | |
220 | ||
221 | /* Set frequency */ | |
222 | gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0); | |
223 | if (low_speed == ((gpio & 0x01) == 0)) | |
224 | goto skip; | |
225 | ||
226 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, frequency_gpio, | |
227 | low_speed ? 0x04 : 0x05); | |
228 | udelay(200); | |
229 | do { | |
230 | if (++timeout > 100) | |
231 | break; | |
232 | local_delay(1); | |
233 | gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, slew_done_gpio, 0); | |
234 | } while((gpio & 0x02) == 0); | |
235 | skip: | |
236 | /* If ramping down, set voltage last */ | |
237 | if (low_speed == 1) { | |
238 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04); | |
239 | /* Delay is way too big but it's ok, we schedule */ | |
240 | local_delay(10); | |
241 | } | |
242 | ||
243 | #ifdef DEBUG_FREQ | |
244 | debug_calc_bogomips(); | |
245 | #endif | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | /* Switch CPU speed under PMU control | |
251 | */ | |
252 | static int pmu_set_cpu_speed(int low_speed) | |
253 | { | |
254 | struct adb_request req; | |
255 | unsigned long save_l2cr; | |
256 | unsigned long save_l3cr; | |
257 | unsigned int pic_prio; | |
258 | unsigned long flags; | |
259 | ||
260 | preempt_disable(); | |
261 | ||
262 | #ifdef DEBUG_FREQ | |
263 | printk(KERN_DEBUG "HID1, before: %x\n", mfspr(SPRN_HID1)); | |
264 | #endif | |
265 | pmu_suspend(); | |
266 | ||
267 | /* Disable all interrupt sources on openpic */ | |
268 | pic_prio = mpic_cpu_get_priority(); | |
269 | mpic_cpu_set_priority(0xf); | |
270 | ||
271 | /* Make sure the decrementer won't interrupt us */ | |
272 | asm volatile("mtdec %0" : : "r" (0x7fffffff)); | |
273 | /* Make sure any pending DEC interrupt occuring while we did | |
274 | * the above didn't re-enable the DEC */ | |
275 | mb(); | |
276 | asm volatile("mtdec %0" : : "r" (0x7fffffff)); | |
277 | ||
278 | /* We can now disable MSR_EE */ | |
279 | local_irq_save(flags); | |
280 | ||
281 | /* Giveup the FPU & vec */ | |
282 | enable_kernel_fp(); | |
283 | ||
284 | #ifdef CONFIG_ALTIVEC | |
285 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) | |
286 | enable_kernel_altivec(); | |
287 | #endif /* CONFIG_ALTIVEC */ | |
288 | ||
289 | /* Save & disable L2 and L3 caches */ | |
290 | save_l3cr = _get_L3CR(); /* (returns -1 if not available) */ | |
291 | save_l2cr = _get_L2CR(); /* (returns -1 if not available) */ | |
292 | ||
293 | /* Send the new speed command. My assumption is that this command | |
294 | * will cause PLL_CFG[0..3] to be changed next time CPU goes to sleep | |
295 | */ | |
296 | pmu_request(&req, NULL, 6, PMU_CPU_SPEED, 'W', 'O', 'O', 'F', low_speed); | |
297 | while (!req.complete) | |
298 | pmu_poll(); | |
299 | ||
300 | /* Prepare the northbridge for the speed transition */ | |
301 | pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,1); | |
302 | ||
303 | /* Call low level code to backup CPU state and recover from | |
304 | * hardware reset | |
305 | */ | |
306 | low_sleep_handler(); | |
307 | ||
308 | /* Restore the northbridge */ | |
309 | pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,0); | |
310 | ||
311 | /* Restore L2 cache */ | |
312 | if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0) | |
313 | _set_L2CR(save_l2cr); | |
314 | /* Restore L3 cache */ | |
315 | if (save_l3cr != 0xffffffff && (save_l3cr & L3CR_L3E) != 0) | |
316 | _set_L3CR(save_l3cr); | |
317 | ||
318 | /* Restore userland MMU context */ | |
319 | set_context(current->active_mm->context, current->active_mm->pgd); | |
320 | ||
321 | #ifdef DEBUG_FREQ | |
322 | printk(KERN_DEBUG "HID1, after: %x\n", mfspr(SPRN_HID1)); | |
323 | #endif | |
324 | ||
325 | /* Restore low level PMU operations */ | |
326 | pmu_unlock(); | |
327 | ||
328 | /* Restore decrementer */ | |
329 | wakeup_decrementer(); | |
330 | ||
331 | /* Restore interrupts */ | |
332 | mpic_cpu_set_priority(pic_prio); | |
333 | ||
334 | /* Let interrupts flow again ... */ | |
335 | local_irq_restore(flags); | |
336 | ||
337 | #ifdef DEBUG_FREQ | |
338 | debug_calc_bogomips(); | |
339 | #endif | |
340 | ||
341 | pmu_resume(); | |
342 | ||
343 | preempt_enable(); | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
348 | static int do_set_cpu_speed(int speed_mode, int notify) | |
349 | { | |
350 | struct cpufreq_freqs freqs; | |
351 | unsigned long l3cr; | |
352 | static unsigned long prev_l3cr; | |
353 | ||
354 | freqs.old = cur_freq; | |
355 | freqs.new = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq; | |
356 | freqs.cpu = smp_processor_id(); | |
357 | ||
358 | if (freqs.old == freqs.new) | |
359 | return 0; | |
360 | ||
361 | if (notify) | |
362 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
363 | if (speed_mode == CPUFREQ_LOW && | |
364 | cpu_has_feature(CPU_FTR_L3CR)) { | |
365 | l3cr = _get_L3CR(); | |
366 | if (l3cr & L3CR_L3E) { | |
367 | prev_l3cr = l3cr; | |
368 | _set_L3CR(0); | |
369 | } | |
370 | } | |
371 | set_speed_proc(speed_mode == CPUFREQ_LOW); | |
372 | if (speed_mode == CPUFREQ_HIGH && | |
373 | cpu_has_feature(CPU_FTR_L3CR)) { | |
374 | l3cr = _get_L3CR(); | |
375 | if ((prev_l3cr & L3CR_L3E) && l3cr != prev_l3cr) | |
376 | _set_L3CR(prev_l3cr); | |
377 | } | |
378 | if (notify) | |
379 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
380 | cur_freq = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq; | |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
385 | static unsigned int pmac_cpufreq_get_speed(unsigned int cpu) | |
386 | { | |
387 | return cur_freq; | |
388 | } | |
389 | ||
390 | static int pmac_cpufreq_verify(struct cpufreq_policy *policy) | |
391 | { | |
392 | return cpufreq_frequency_table_verify(policy, pmac_cpu_freqs); | |
393 | } | |
394 | ||
395 | static int pmac_cpufreq_target( struct cpufreq_policy *policy, | |
396 | unsigned int target_freq, | |
397 | unsigned int relation) | |
398 | { | |
399 | unsigned int newstate = 0; | |
400 | ||
401 | if (cpufreq_frequency_table_target(policy, pmac_cpu_freqs, | |
402 | target_freq, relation, &newstate)) | |
403 | return -EINVAL; | |
404 | ||
405 | return do_set_cpu_speed(newstate, 1); | |
406 | } | |
407 | ||
408 | unsigned int pmac_get_one_cpufreq(int i) | |
409 | { | |
410 | /* Supports only one CPU for now */ | |
411 | return (i == 0) ? cur_freq : 0; | |
412 | } | |
413 | ||
414 | static int pmac_cpufreq_cpu_init(struct cpufreq_policy *policy) | |
415 | { | |
416 | if (policy->cpu != 0) | |
417 | return -ENODEV; | |
418 | ||
419 | policy->governor = CPUFREQ_DEFAULT_GOVERNOR; | |
420 | policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; | |
421 | policy->cur = cur_freq; | |
422 | ||
423 | cpufreq_frequency_table_get_attr(pmac_cpu_freqs, policy->cpu); | |
424 | return cpufreq_frequency_table_cpuinfo(policy, pmac_cpu_freqs); | |
425 | } | |
426 | ||
427 | static u32 read_gpio(struct device_node *np) | |
428 | { | |
429 | u32 *reg = (u32 *)get_property(np, "reg", NULL); | |
430 | u32 offset; | |
431 | ||
432 | if (reg == NULL) | |
433 | return 0; | |
434 | /* That works for all keylargos but shall be fixed properly | |
435 | * some day... The problem is that it seems we can't rely | |
436 | * on the "reg" property of the GPIO nodes, they are either | |
437 | * relative to the base of KeyLargo or to the base of the | |
438 | * GPIO space, and the device-tree doesn't help. | |
439 | */ | |
440 | offset = *reg; | |
441 | if (offset < KEYLARGO_GPIO_LEVELS0) | |
442 | offset += KEYLARGO_GPIO_LEVELS0; | |
443 | return offset; | |
444 | } | |
445 | ||
446 | static int pmac_cpufreq_suspend(struct cpufreq_policy *policy, pm_message_t pmsg) | |
447 | { | |
448 | /* Ok, this could be made a bit smarter, but let's be robust for now. We | |
449 | * always force a speed change to high speed before sleep, to make sure | |
450 | * we have appropriate voltage and/or bus speed for the wakeup process, | |
451 | * and to make sure our loops_per_jiffies are "good enough", that is will | |
452 | * not cause too short delays if we sleep in low speed and wake in high | |
453 | * speed.. | |
454 | */ | |
455 | no_schedule = 1; | |
456 | sleep_freq = cur_freq; | |
457 | if (cur_freq == low_freq && !is_pmu_based) | |
458 | do_set_cpu_speed(CPUFREQ_HIGH, 0); | |
459 | return 0; | |
460 | } | |
461 | ||
462 | static int pmac_cpufreq_resume(struct cpufreq_policy *policy) | |
463 | { | |
464 | /* If we resume, first check if we have a get() function */ | |
465 | if (get_speed_proc) | |
466 | cur_freq = get_speed_proc(); | |
467 | else | |
468 | cur_freq = 0; | |
469 | ||
470 | /* We don't, hrm... we don't really know our speed here, best | |
471 | * is that we force a switch to whatever it was, which is | |
472 | * probably high speed due to our suspend() routine | |
473 | */ | |
474 | do_set_cpu_speed(sleep_freq == low_freq ? | |
475 | CPUFREQ_LOW : CPUFREQ_HIGH, 0); | |
476 | ||
477 | no_schedule = 0; | |
478 | return 0; | |
479 | } | |
480 | ||
481 | static struct cpufreq_driver pmac_cpufreq_driver = { | |
482 | .verify = pmac_cpufreq_verify, | |
483 | .target = pmac_cpufreq_target, | |
484 | .get = pmac_cpufreq_get_speed, | |
485 | .init = pmac_cpufreq_cpu_init, | |
486 | .suspend = pmac_cpufreq_suspend, | |
487 | .resume = pmac_cpufreq_resume, | |
488 | .flags = CPUFREQ_PM_NO_WARN, | |
489 | .attr = pmac_cpu_freqs_attr, | |
490 | .name = "powermac", | |
491 | .owner = THIS_MODULE, | |
492 | }; | |
493 | ||
494 | ||
495 | static int pmac_cpufreq_init_MacRISC3(struct device_node *cpunode) | |
496 | { | |
497 | struct device_node *volt_gpio_np = of_find_node_by_name(NULL, | |
498 | "voltage-gpio"); | |
499 | struct device_node *freq_gpio_np = of_find_node_by_name(NULL, | |
500 | "frequency-gpio"); | |
501 | struct device_node *slew_done_gpio_np = of_find_node_by_name(NULL, | |
502 | "slewing-done"); | |
503 | u32 *value; | |
504 | ||
505 | /* | |
506 | * Check to see if it's GPIO driven or PMU only | |
507 | * | |
508 | * The way we extract the GPIO address is slightly hackish, but it | |
509 | * works well enough for now. We need to abstract the whole GPIO | |
510 | * stuff sooner or later anyway | |
511 | */ | |
512 | ||
513 | if (volt_gpio_np) | |
514 | voltage_gpio = read_gpio(volt_gpio_np); | |
515 | if (freq_gpio_np) | |
516 | frequency_gpio = read_gpio(freq_gpio_np); | |
517 | if (slew_done_gpio_np) | |
518 | slew_done_gpio = read_gpio(slew_done_gpio_np); | |
519 | ||
520 | /* If we use the frequency GPIOs, calculate the min/max speeds based | |
521 | * on the bus frequencies | |
522 | */ | |
523 | if (frequency_gpio && slew_done_gpio) { | |
524 | int lenp, rc; | |
525 | u32 *freqs, *ratio; | |
526 | ||
527 | freqs = (u32 *)get_property(cpunode, "bus-frequencies", &lenp); | |
528 | lenp /= sizeof(u32); | |
529 | if (freqs == NULL || lenp != 2) { | |
530 | printk(KERN_ERR "cpufreq: bus-frequencies incorrect or missing\n"); | |
531 | return 1; | |
532 | } | |
533 | ratio = (u32 *)get_property(cpunode, "processor-to-bus-ratio*2", NULL); | |
534 | if (ratio == NULL) { | |
535 | printk(KERN_ERR "cpufreq: processor-to-bus-ratio*2 missing\n"); | |
536 | return 1; | |
537 | } | |
538 | ||
539 | /* Get the min/max bus frequencies */ | |
540 | low_freq = min(freqs[0], freqs[1]); | |
541 | hi_freq = max(freqs[0], freqs[1]); | |
542 | ||
543 | /* Grrrr.. It _seems_ that the device-tree is lying on the low bus | |
544 | * frequency, it claims it to be around 84Mhz on some models while | |
545 | * it appears to be approx. 101Mhz on all. Let's hack around here... | |
546 | * fortunately, we don't need to be too precise | |
547 | */ | |
548 | if (low_freq < 98000000) | |
549 | low_freq = 101000000; | |
550 | ||
551 | /* Convert those to CPU core clocks */ | |
552 | low_freq = (low_freq * (*ratio)) / 2000; | |
553 | hi_freq = (hi_freq * (*ratio)) / 2000; | |
554 | ||
555 | /* Now we get the frequencies, we read the GPIO to see what is out current | |
556 | * speed | |
557 | */ | |
558 | rc = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0); | |
559 | cur_freq = (rc & 0x01) ? hi_freq : low_freq; | |
560 | ||
561 | set_speed_proc = gpios_set_cpu_speed; | |
562 | return 1; | |
563 | } | |
564 | ||
565 | /* If we use the PMU, look for the min & max frequencies in the | |
566 | * device-tree | |
567 | */ | |
568 | value = (u32 *)get_property(cpunode, "min-clock-frequency", NULL); | |
569 | if (!value) | |
570 | return 1; | |
571 | low_freq = (*value) / 1000; | |
572 | /* The PowerBook G4 12" (PowerBook6,1) has an error in the device-tree | |
573 | * here */ | |
574 | if (low_freq < 100000) | |
575 | low_freq *= 10; | |
576 | ||
577 | value = (u32 *)get_property(cpunode, "max-clock-frequency", NULL); | |
578 | if (!value) | |
579 | return 1; | |
580 | hi_freq = (*value) / 1000; | |
581 | set_speed_proc = pmu_set_cpu_speed; | |
582 | is_pmu_based = 1; | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
587 | static int pmac_cpufreq_init_7447A(struct device_node *cpunode) | |
588 | { | |
589 | struct device_node *volt_gpio_np; | |
590 | ||
591 | if (get_property(cpunode, "dynamic-power-step", NULL) == NULL) | |
592 | return 1; | |
593 | ||
594 | volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select"); | |
595 | if (volt_gpio_np) | |
596 | voltage_gpio = read_gpio(volt_gpio_np); | |
597 | if (!voltage_gpio){ | |
598 | printk(KERN_ERR "cpufreq: missing cpu-vcore-select gpio\n"); | |
599 | return 1; | |
600 | } | |
601 | ||
602 | /* OF only reports the high frequency */ | |
603 | hi_freq = cur_freq; | |
604 | low_freq = cur_freq/2; | |
605 | ||
606 | /* Read actual frequency from CPU */ | |
607 | cur_freq = dfs_get_cpu_speed(); | |
608 | set_speed_proc = dfs_set_cpu_speed; | |
609 | get_speed_proc = dfs_get_cpu_speed; | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
614 | static int pmac_cpufreq_init_750FX(struct device_node *cpunode) | |
615 | { | |
616 | struct device_node *volt_gpio_np; | |
617 | u32 pvr, *value; | |
618 | ||
619 | if (get_property(cpunode, "dynamic-power-step", NULL) == NULL) | |
620 | return 1; | |
621 | ||
622 | hi_freq = cur_freq; | |
623 | value = (u32 *)get_property(cpunode, "reduced-clock-frequency", NULL); | |
624 | if (!value) | |
625 | return 1; | |
626 | low_freq = (*value) / 1000; | |
627 | ||
628 | volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select"); | |
629 | if (volt_gpio_np) | |
630 | voltage_gpio = read_gpio(volt_gpio_np); | |
631 | ||
632 | pvr = mfspr(SPRN_PVR); | |
633 | has_cpu_l2lve = !((pvr & 0xf00) == 0x100); | |
634 | ||
635 | set_speed_proc = cpu_750fx_cpu_speed; | |
636 | get_speed_proc = cpu_750fx_get_cpu_speed; | |
637 | cur_freq = cpu_750fx_get_cpu_speed(); | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
642 | /* Currently, we support the following machines: | |
643 | * | |
644 | * - Titanium PowerBook 1Ghz (PMU based, 667Mhz & 1Ghz) | |
645 | * - Titanium PowerBook 800 (PMU based, 667Mhz & 800Mhz) | |
646 | * - Titanium PowerBook 400 (PMU based, 300Mhz & 400Mhz) | |
647 | * - Titanium PowerBook 500 (PMU based, 300Mhz & 500Mhz) | |
648 | * - iBook2 500/600 (PMU based, 400Mhz & 500/600Mhz) | |
649 | * - iBook2 700 (CPU based, 400Mhz & 700Mhz, support low voltage) | |
650 | * - Recent MacRISC3 laptops | |
651 | * - All new machines with 7447A CPUs | |
652 | */ | |
653 | static int __init pmac_cpufreq_setup(void) | |
654 | { | |
655 | struct device_node *cpunode; | |
656 | u32 *value; | |
657 | ||
658 | if (strstr(cmd_line, "nocpufreq")) | |
659 | return 0; | |
660 | ||
661 | /* Assume only one CPU */ | |
662 | cpunode = find_type_devices("cpu"); | |
663 | if (!cpunode) | |
664 | goto out; | |
665 | ||
666 | /* Get current cpu clock freq */ | |
667 | value = (u32 *)get_property(cpunode, "clock-frequency", NULL); | |
668 | if (!value) | |
669 | goto out; | |
670 | cur_freq = (*value) / 1000; | |
671 | ||
672 | /* Check for 7447A based MacRISC3 */ | |
673 | if (machine_is_compatible("MacRISC3") && | |
674 | get_property(cpunode, "dynamic-power-step", NULL) && | |
675 | PVR_VER(mfspr(SPRN_PVR)) == 0x8003) { | |
676 | pmac_cpufreq_init_7447A(cpunode); | |
677 | /* Check for other MacRISC3 machines */ | |
678 | } else if (machine_is_compatible("PowerBook3,4") || | |
679 | machine_is_compatible("PowerBook3,5") || | |
680 | machine_is_compatible("MacRISC3")) { | |
681 | pmac_cpufreq_init_MacRISC3(cpunode); | |
682 | /* Else check for iBook2 500/600 */ | |
683 | } else if (machine_is_compatible("PowerBook4,1")) { | |
684 | hi_freq = cur_freq; | |
685 | low_freq = 400000; | |
686 | set_speed_proc = pmu_set_cpu_speed; | |
687 | is_pmu_based = 1; | |
688 | } | |
5629d41d PM |
689 | /* Else check for TiPb 550 */ |
690 | else if (machine_is_compatible("PowerBook3,3") && cur_freq == 550000) { | |
691 | hi_freq = cur_freq; | |
692 | low_freq = 500000; | |
693 | set_speed_proc = pmu_set_cpu_speed; | |
694 | is_pmu_based = 1; | |
695 | } | |
14cf11af PM |
696 | /* Else check for TiPb 400 & 500 */ |
697 | else if (machine_is_compatible("PowerBook3,2")) { | |
698 | /* We only know about the 400 MHz and the 500Mhz model | |
699 | * they both have 300 MHz as low frequency | |
700 | */ | |
701 | if (cur_freq < 350000 || cur_freq > 550000) | |
702 | goto out; | |
703 | hi_freq = cur_freq; | |
704 | low_freq = 300000; | |
705 | set_speed_proc = pmu_set_cpu_speed; | |
706 | is_pmu_based = 1; | |
707 | } | |
708 | /* Else check for 750FX */ | |
709 | else if (PVR_VER(mfspr(SPRN_PVR)) == 0x7000) | |
710 | pmac_cpufreq_init_750FX(cpunode); | |
711 | out: | |
712 | if (set_speed_proc == NULL) | |
713 | return -ENODEV; | |
714 | ||
715 | pmac_cpu_freqs[CPUFREQ_LOW].frequency = low_freq; | |
716 | pmac_cpu_freqs[CPUFREQ_HIGH].frequency = hi_freq; | |
717 | ||
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 | ||
725 | module_init(pmac_cpufreq_setup); | |
726 |