1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (C) 2002 - 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org> |
4 | * Copyright (C) 2004 John Steele Scott <toojays@toojays.net> |
5 | * |
6 | * TODO: Need a big cleanup here. Basically, we need to have different |
7 | * cpufreq_driver structures for the different type of HW instead of the |
8 | * current mess. We also need to better deal with the detection of the |
9 | * type of machine. |
10 | */ |
11 | |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | |
14 | #include <linux/module.h> |
15 | #include <linux/types.h> |
16 | #include <linux/errno.h> |
17 | #include <linux/kernel.h> |
18 | #include <linux/delay.h> |
19 | #include <linux/sched.h> |
20 | #include <linux/adb.h> |
21 | #include <linux/pmu.h> |
22 | #include <linux/cpufreq.h> |
23 | #include <linux/init.h> |
24 | #include <linux/device.h> |
25 | #include <linux/hardirq.h> |
26 | #include <linux/of.h> |
27 | #include <linux/of_address.h> |
28 | |
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/mpic.h> |
37 | #include <asm/keylargo.h> |
38 | #include <asm/switch_to.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 | |
46 | extern void low_choose_7447a_dfs(int dfs); |
47 | extern void low_choose_750fx_pll(int pll); |
48 | extern void low_sleep_handler(void); |
49 | |
50 | /* |
51 | * Currently, PowerMac cpufreq supports only high & low frequencies |
52 | * that are set by the firmware |
53 | */ |
54 | static unsigned int low_freq; |
55 | static unsigned int hi_freq; |
56 | static unsigned int cur_freq; |
57 | static unsigned int sleep_freq; |
58 | static unsigned long transition_latency; |
59 | |
60 | /* |
61 | * Different models uses different mechanisms to switch the frequency |
62 | */ |
63 | static int (*set_speed_proc)(int low_speed); |
64 | static unsigned int (*get_speed_proc)(void); |
65 | |
66 | /* |
67 | * Some definitions used by the various speedprocs |
68 | */ |
69 | static u32 voltage_gpio; |
70 | static u32 frequency_gpio; |
71 | static u32 slew_done_gpio; |
72 | static int no_schedule; |
73 | static int has_cpu_l2lve; |
74 | static int is_pmu_based; |
75 | |
76 | /* There are only two frequency states for each processor. Values |
77 | * are in kHz for the time being. |
78 | */ |
79 | #define CPUFREQ_HIGH 0 |
80 | #define CPUFREQ_LOW 1 |
81 | |
82 | static struct cpufreq_frequency_table pmac_cpu_freqs[] = { |
83 | {0, CPUFREQ_HIGH, 0}, |
84 | {0, CPUFREQ_LOW, 0}, |
85 | {0, 0, CPUFREQ_TABLE_END}, |
86 | }; |
87 | |
88 | static inline void local_delay(unsigned long ms) |
89 | { |
90 | if (no_schedule) |
91 | mdelay(ms); |
92 | else |
93 | msleep(msecs: ms); |
94 | } |
95 | |
96 | #ifdef DEBUG_FREQ |
97 | static inline void debug_calc_bogomips(void) |
98 | { |
99 | /* This will cause a recalc of bogomips and display the |
100 | * result. We backup/restore the value to avoid affecting the |
101 | * core cpufreq framework's own calculation. |
102 | */ |
103 | unsigned long save_lpj = loops_per_jiffy; |
104 | calibrate_delay(); |
105 | loops_per_jiffy = save_lpj; |
106 | } |
107 | #endif /* DEBUG_FREQ */ |
108 | |
109 | /* Switch CPU speed under 750FX CPU control |
110 | */ |
111 | static int cpu_750fx_cpu_speed(int low_speed) |
112 | { |
113 | u32 hid2; |
114 | |
115 | if (low_speed == 0) { |
116 | /* ramping up, set voltage first */ |
117 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05); |
118 | /* Make sure we sleep for at least 1ms */ |
119 | local_delay(ms: 10); |
120 | |
121 | /* tweak L2 for high voltage */ |
122 | if (has_cpu_l2lve) { |
123 | hid2 = mfspr(SPRN_HID2); |
124 | hid2 &= ~0x2000; |
125 | mtspr(SPRN_HID2, hid2); |
126 | } |
127 | } |
128 | #ifdef CONFIG_PPC_BOOK3S_32 |
129 | low_choose_750fx_pll(low_speed); |
130 | #endif |
131 | if (low_speed == 1) { |
132 | /* tweak L2 for low voltage */ |
133 | if (has_cpu_l2lve) { |
134 | hid2 = mfspr(SPRN_HID2); |
135 | hid2 |= 0x2000; |
136 | mtspr(SPRN_HID2, hid2); |
137 | } |
138 | |
139 | /* ramping down, set voltage last */ |
140 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04); |
141 | local_delay(ms: 10); |
142 | } |
143 | |
144 | return 0; |
145 | } |
146 | |
147 | static unsigned int cpu_750fx_get_cpu_speed(void) |
148 | { |
149 | if (mfspr(SPRN_HID1) & HID1_PS) |
150 | return low_freq; |
151 | else |
152 | return hi_freq; |
153 | } |
154 | |
155 | /* Switch CPU speed using DFS */ |
156 | static int dfs_set_cpu_speed(int low_speed) |
157 | { |
158 | if (low_speed == 0) { |
159 | /* ramping up, set voltage first */ |
160 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05); |
161 | /* Make sure we sleep for at least 1ms */ |
162 | local_delay(ms: 1); |
163 | } |
164 | |
165 | /* set frequency */ |
166 | #ifdef CONFIG_PPC_BOOK3S_32 |
167 | low_choose_7447a_dfs(low_speed); |
168 | #endif |
169 | udelay(100); |
170 | |
171 | if (low_speed == 1) { |
172 | /* ramping down, set voltage last */ |
173 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04); |
174 | local_delay(ms: 1); |
175 | } |
176 | |
177 | return 0; |
178 | } |
179 | |
180 | static unsigned int dfs_get_cpu_speed(void) |
181 | { |
182 | if (mfspr(SPRN_HID1) & HID1_DFS) |
183 | return low_freq; |
184 | else |
185 | return hi_freq; |
186 | } |
187 | |
188 | |
189 | /* Switch CPU speed using slewing GPIOs |
190 | */ |
191 | static int gpios_set_cpu_speed(int low_speed) |
192 | { |
193 | int gpio, timeout = 0; |
194 | |
195 | /* If ramping up, set voltage first */ |
196 | if (low_speed == 0) { |
197 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05); |
198 | /* Delay is way too big but it's ok, we schedule */ |
199 | local_delay(ms: 10); |
200 | } |
201 | |
202 | /* Set frequency */ |
203 | gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0); |
204 | if (low_speed == ((gpio & 0x01) == 0)) |
205 | goto skip; |
206 | |
207 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, frequency_gpio, |
208 | low_speed ? 0x04 : 0x05); |
209 | udelay(200); |
210 | do { |
211 | if (++timeout > 100) |
212 | break; |
213 | local_delay(ms: 1); |
214 | gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, slew_done_gpio, 0); |
215 | } while((gpio & 0x02) == 0); |
216 | skip: |
217 | /* If ramping down, set voltage last */ |
218 | if (low_speed == 1) { |
219 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04); |
220 | /* Delay is way too big but it's ok, we schedule */ |
221 | local_delay(ms: 10); |
222 | } |
223 | |
224 | #ifdef DEBUG_FREQ |
225 | debug_calc_bogomips(); |
226 | #endif |
227 | |
228 | return 0; |
229 | } |
230 | |
231 | /* Switch CPU speed under PMU control |
232 | */ |
233 | static int pmu_set_cpu_speed(int low_speed) |
234 | { |
235 | struct adb_request req; |
236 | unsigned long save_l2cr; |
237 | unsigned long save_l3cr; |
238 | unsigned int pic_prio; |
239 | unsigned long flags; |
240 | |
241 | preempt_disable(); |
242 | |
243 | #ifdef DEBUG_FREQ |
244 | printk(KERN_DEBUG "HID1, before: %x\n" , mfspr(SPRN_HID1)); |
245 | #endif |
246 | pmu_suspend(); |
247 | |
248 | /* Disable all interrupt sources on openpic */ |
249 | pic_prio = mpic_cpu_get_priority(); |
250 | mpic_cpu_set_priority(0xf); |
251 | |
252 | /* Make sure the decrementer won't interrupt us */ |
253 | asm volatile("mtdec %0" : : "r" (0x7fffffff)); |
254 | /* Make sure any pending DEC interrupt occurring while we did |
255 | * the above didn't re-enable the DEC */ |
256 | mb(); |
257 | asm volatile("mtdec %0" : : "r" (0x7fffffff)); |
258 | |
259 | /* We can now disable MSR_EE */ |
260 | local_irq_save(flags); |
261 | |
262 | /* Giveup the FPU & vec */ |
263 | enable_kernel_fp(); |
264 | |
265 | #ifdef CONFIG_ALTIVEC |
266 | if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
267 | enable_kernel_altivec(); |
268 | #endif /* CONFIG_ALTIVEC */ |
269 | |
270 | /* Save & disable L2 and L3 caches */ |
271 | save_l3cr = _get_L3CR(); /* (returns -1 if not available) */ |
272 | save_l2cr = _get_L2CR(); /* (returns -1 if not available) */ |
273 | |
274 | /* Send the new speed command. My assumption is that this command |
275 | * will cause PLL_CFG[0..3] to be changed next time CPU goes to sleep |
276 | */ |
277 | pmu_request(req: &req, NULL, nbytes: 6, PMU_CPU_SPEED, 'W', 'O', 'O', 'F', low_speed); |
278 | while (!req.complete) |
279 | pmu_poll(); |
280 | |
281 | /* Prepare the northbridge for the speed transition */ |
282 | pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,1); |
283 | |
284 | /* Call low level code to backup CPU state and recover from |
285 | * hardware reset |
286 | */ |
287 | low_sleep_handler(); |
288 | |
289 | /* Restore the northbridge */ |
290 | pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,0); |
291 | |
292 | /* Restore L2 cache */ |
293 | if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0) |
294 | _set_L2CR(save_l2cr); |
295 | /* Restore L3 cache */ |
296 | if (save_l3cr != 0xffffffff && (save_l3cr & L3CR_L3E) != 0) |
297 | _set_L3CR(save_l3cr); |
298 | |
299 | /* Restore userland MMU context */ |
300 | switch_mmu_context(NULL, current->active_mm, NULL); |
301 | |
302 | #ifdef DEBUG_FREQ |
303 | printk(KERN_DEBUG "HID1, after: %x\n" , mfspr(SPRN_HID1)); |
304 | #endif |
305 | |
306 | /* Restore low level PMU operations */ |
307 | pmu_unlock(); |
308 | |
309 | /* |
310 | * Restore decrementer; we'll take a decrementer interrupt |
311 | * as soon as interrupts are re-enabled and the generic |
312 | * clockevents code will reprogram it with the right value. |
313 | */ |
314 | set_dec(1); |
315 | |
316 | /* Restore interrupts */ |
317 | mpic_cpu_set_priority(pic_prio); |
318 | |
319 | /* Let interrupts flow again ... */ |
320 | local_irq_restore(flags); |
321 | |
322 | #ifdef DEBUG_FREQ |
323 | debug_calc_bogomips(); |
324 | #endif |
325 | |
326 | pmu_resume(); |
327 | |
328 | preempt_enable(); |
329 | |
330 | return 0; |
331 | } |
332 | |
333 | static int do_set_cpu_speed(struct cpufreq_policy *policy, int speed_mode) |
334 | { |
335 | unsigned long l3cr; |
336 | static unsigned long prev_l3cr; |
337 | |
338 | if (speed_mode == CPUFREQ_LOW && |
339 | cpu_has_feature(CPU_FTR_L3CR)) { |
340 | l3cr = _get_L3CR(); |
341 | if (l3cr & L3CR_L3E) { |
342 | prev_l3cr = l3cr; |
343 | _set_L3CR(0); |
344 | } |
345 | } |
346 | set_speed_proc(speed_mode == CPUFREQ_LOW); |
347 | if (speed_mode == CPUFREQ_HIGH && |
348 | cpu_has_feature(CPU_FTR_L3CR)) { |
349 | l3cr = _get_L3CR(); |
350 | if ((prev_l3cr & L3CR_L3E) && l3cr != prev_l3cr) |
351 | _set_L3CR(prev_l3cr); |
352 | } |
353 | cur_freq = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq; |
354 | |
355 | return 0; |
356 | } |
357 | |
358 | static unsigned int pmac_cpufreq_get_speed(unsigned int cpu) |
359 | { |
360 | return cur_freq; |
361 | } |
362 | |
363 | static int pmac_cpufreq_target( struct cpufreq_policy *policy, |
364 | unsigned int index) |
365 | { |
366 | int rc; |
367 | |
368 | rc = do_set_cpu_speed(policy, speed_mode: index); |
369 | |
370 | ppc_proc_freq = cur_freq * 1000ul; |
371 | return rc; |
372 | } |
373 | |
374 | static int pmac_cpufreq_cpu_init(struct cpufreq_policy *policy) |
375 | { |
376 | cpufreq_generic_init(policy, table: pmac_cpu_freqs, transition_latency); |
377 | return 0; |
378 | } |
379 | |
380 | static u32 read_gpio(struct device_node *np) |
381 | { |
382 | u64 offset; |
383 | |
384 | if (of_property_read_reg(np, idx: 0, addr: &offset, NULL) < 0) |
385 | return 0; |
386 | /* That works for all keylargos but shall be fixed properly |
387 | * some day... The problem is that it seems we can't rely |
388 | * on the "reg" property of the GPIO nodes, they are either |
389 | * relative to the base of KeyLargo or to the base of the |
390 | * GPIO space, and the device-tree doesn't help. |
391 | */ |
392 | if (offset < KEYLARGO_GPIO_LEVELS0) |
393 | offset += KEYLARGO_GPIO_LEVELS0; |
394 | return offset; |
395 | } |
396 | |
397 | static int pmac_cpufreq_suspend(struct cpufreq_policy *policy) |
398 | { |
399 | /* Ok, this could be made a bit smarter, but let's be robust for now. We |
400 | * always force a speed change to high speed before sleep, to make sure |
401 | * we have appropriate voltage and/or bus speed for the wakeup process, |
402 | * and to make sure our loops_per_jiffies are "good enough", that is will |
403 | * not cause too short delays if we sleep in low speed and wake in high |
404 | * speed.. |
405 | */ |
406 | no_schedule = 1; |
407 | sleep_freq = cur_freq; |
408 | if (cur_freq == low_freq && !is_pmu_based) |
409 | do_set_cpu_speed(policy, CPUFREQ_HIGH); |
410 | return 0; |
411 | } |
412 | |
413 | static int pmac_cpufreq_resume(struct cpufreq_policy *policy) |
414 | { |
415 | /* If we resume, first check if we have a get() function */ |
416 | if (get_speed_proc) |
417 | cur_freq = get_speed_proc(); |
418 | else |
419 | cur_freq = 0; |
420 | |
421 | /* We don't, hrm... we don't really know our speed here, best |
422 | * is that we force a switch to whatever it was, which is |
423 | * probably high speed due to our suspend() routine |
424 | */ |
425 | do_set_cpu_speed(policy, speed_mode: sleep_freq == low_freq ? |
426 | CPUFREQ_LOW : CPUFREQ_HIGH); |
427 | |
428 | ppc_proc_freq = cur_freq * 1000ul; |
429 | |
430 | no_schedule = 0; |
431 | return 0; |
432 | } |
433 | |
434 | static struct cpufreq_driver pmac_cpufreq_driver = { |
435 | .verify = cpufreq_generic_frequency_table_verify, |
436 | .target_index = pmac_cpufreq_target, |
437 | .get = pmac_cpufreq_get_speed, |
438 | .init = pmac_cpufreq_cpu_init, |
439 | .suspend = pmac_cpufreq_suspend, |
440 | .resume = pmac_cpufreq_resume, |
441 | .flags = CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING, |
442 | .attr = cpufreq_generic_attr, |
443 | .name = "powermac" , |
444 | }; |
445 | |
446 | |
447 | static int pmac_cpufreq_init_MacRISC3(struct device_node *cpunode) |
448 | { |
449 | struct device_node *volt_gpio_np = of_find_node_by_name(NULL, |
450 | name: "voltage-gpio" ); |
451 | struct device_node *freq_gpio_np = of_find_node_by_name(NULL, |
452 | name: "frequency-gpio" ); |
453 | struct device_node *slew_done_gpio_np = of_find_node_by_name(NULL, |
454 | name: "slewing-done" ); |
455 | const u32 *value; |
456 | |
457 | /* |
458 | * Check to see if it's GPIO driven or PMU only |
459 | * |
460 | * The way we extract the GPIO address is slightly hackish, but it |
461 | * works well enough for now. We need to abstract the whole GPIO |
462 | * stuff sooner or later anyway |
463 | */ |
464 | |
465 | if (volt_gpio_np) |
466 | voltage_gpio = read_gpio(np: volt_gpio_np); |
467 | if (freq_gpio_np) |
468 | frequency_gpio = read_gpio(np: freq_gpio_np); |
469 | if (slew_done_gpio_np) |
470 | slew_done_gpio = read_gpio(np: slew_done_gpio_np); |
471 | |
472 | of_node_put(node: volt_gpio_np); |
473 | of_node_put(node: freq_gpio_np); |
474 | of_node_put(node: slew_done_gpio_np); |
475 | |
476 | /* If we use the frequency GPIOs, calculate the min/max speeds based |
477 | * on the bus frequencies |
478 | */ |
479 | if (frequency_gpio && slew_done_gpio) { |
480 | int lenp, rc; |
481 | const u32 *freqs, *ratio; |
482 | |
483 | freqs = of_get_property(node: cpunode, name: "bus-frequencies" , lenp: &lenp); |
484 | lenp /= sizeof(u32); |
485 | if (freqs == NULL || lenp != 2) { |
486 | pr_err("bus-frequencies incorrect or missing\n" ); |
487 | return 1; |
488 | } |
489 | ratio = of_get_property(node: cpunode, name: "processor-to-bus-ratio*2" , |
490 | NULL); |
491 | if (ratio == NULL) { |
492 | pr_err("processor-to-bus-ratio*2 missing\n" ); |
493 | return 1; |
494 | } |
495 | |
496 | /* Get the min/max bus frequencies */ |
497 | low_freq = min(freqs[0], freqs[1]); |
498 | hi_freq = max(freqs[0], freqs[1]); |
499 | |
500 | /* Grrrr.. It _seems_ that the device-tree is lying on the low bus |
501 | * frequency, it claims it to be around 84Mhz on some models while |
502 | * it appears to be approx. 101Mhz on all. Let's hack around here... |
503 | * fortunately, we don't need to be too precise |
504 | */ |
505 | if (low_freq < 98000000) |
506 | low_freq = 101000000; |
507 | |
508 | /* Convert those to CPU core clocks */ |
509 | low_freq = (low_freq * (*ratio)) / 2000; |
510 | hi_freq = (hi_freq * (*ratio)) / 2000; |
511 | |
512 | /* Now we get the frequencies, we read the GPIO to see what is out current |
513 | * speed |
514 | */ |
515 | rc = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0); |
516 | cur_freq = (rc & 0x01) ? hi_freq : low_freq; |
517 | |
518 | set_speed_proc = gpios_set_cpu_speed; |
519 | return 1; |
520 | } |
521 | |
522 | /* If we use the PMU, look for the min & max frequencies in the |
523 | * device-tree |
524 | */ |
525 | value = of_get_property(node: cpunode, name: "min-clock-frequency" , NULL); |
526 | if (!value) |
527 | return 1; |
528 | low_freq = (*value) / 1000; |
529 | /* The PowerBook G4 12" (PowerBook6,1) has an error in the device-tree |
530 | * here */ |
531 | if (low_freq < 100000) |
532 | low_freq *= 10; |
533 | |
534 | value = of_get_property(node: cpunode, name: "max-clock-frequency" , NULL); |
535 | if (!value) |
536 | return 1; |
537 | hi_freq = (*value) / 1000; |
538 | set_speed_proc = pmu_set_cpu_speed; |
539 | is_pmu_based = 1; |
540 | |
541 | return 0; |
542 | } |
543 | |
544 | static int pmac_cpufreq_init_7447A(struct device_node *cpunode) |
545 | { |
546 | struct device_node *volt_gpio_np; |
547 | |
548 | if (!of_property_read_bool(np: cpunode, propname: "dynamic-power-step" )) |
549 | return 1; |
550 | |
551 | volt_gpio_np = of_find_node_by_name(NULL, name: "cpu-vcore-select" ); |
552 | if (volt_gpio_np) |
553 | voltage_gpio = read_gpio(np: volt_gpio_np); |
554 | of_node_put(node: volt_gpio_np); |
555 | if (!voltage_gpio){ |
556 | pr_err("missing cpu-vcore-select gpio\n" ); |
557 | return 1; |
558 | } |
559 | |
560 | /* OF only reports the high frequency */ |
561 | hi_freq = cur_freq; |
562 | low_freq = cur_freq/2; |
563 | |
564 | /* Read actual frequency from CPU */ |
565 | cur_freq = dfs_get_cpu_speed(); |
566 | set_speed_proc = dfs_set_cpu_speed; |
567 | get_speed_proc = dfs_get_cpu_speed; |
568 | |
569 | return 0; |
570 | } |
571 | |
572 | static int pmac_cpufreq_init_750FX(struct device_node *cpunode) |
573 | { |
574 | struct device_node *volt_gpio_np; |
575 | u32 pvr; |
576 | const u32 *value; |
577 | |
578 | if (!of_property_read_bool(np: cpunode, propname: "dynamic-power-step" )) |
579 | return 1; |
580 | |
581 | hi_freq = cur_freq; |
582 | value = of_get_property(node: cpunode, name: "reduced-clock-frequency" , NULL); |
583 | if (!value) |
584 | return 1; |
585 | low_freq = (*value) / 1000; |
586 | |
587 | volt_gpio_np = of_find_node_by_name(NULL, name: "cpu-vcore-select" ); |
588 | if (volt_gpio_np) |
589 | voltage_gpio = read_gpio(np: volt_gpio_np); |
590 | |
591 | of_node_put(node: volt_gpio_np); |
592 | pvr = mfspr(SPRN_PVR); |
593 | has_cpu_l2lve = !((pvr & 0xf00) == 0x100); |
594 | |
595 | set_speed_proc = cpu_750fx_cpu_speed; |
596 | get_speed_proc = cpu_750fx_get_cpu_speed; |
597 | cur_freq = cpu_750fx_get_cpu_speed(); |
598 | |
599 | return 0; |
600 | } |
601 | |
602 | /* Currently, we support the following machines: |
603 | * |
604 | * - Titanium PowerBook 1Ghz (PMU based, 667Mhz & 1Ghz) |
605 | * - Titanium PowerBook 800 (PMU based, 667Mhz & 800Mhz) |
606 | * - Titanium PowerBook 400 (PMU based, 300Mhz & 400Mhz) |
607 | * - Titanium PowerBook 500 (PMU based, 300Mhz & 500Mhz) |
608 | * - iBook2 500/600 (PMU based, 400Mhz & 500/600Mhz) |
609 | * - iBook2 700 (CPU based, 400Mhz & 700Mhz, support low voltage) |
610 | * - Recent MacRISC3 laptops |
611 | * - All new machines with 7447A CPUs |
612 | */ |
613 | static int __init pmac_cpufreq_setup(void) |
614 | { |
615 | struct device_node *cpunode; |
616 | const u32 *value; |
617 | |
618 | if (strstr(boot_command_line, "nocpufreq" )) |
619 | return 0; |
620 | |
621 | /* Get first CPU node */ |
622 | cpunode = of_cpu_device_node_get(cpu: 0); |
623 | if (!cpunode) |
624 | goto out; |
625 | |
626 | /* Get current cpu clock freq */ |
627 | value = of_get_property(node: cpunode, name: "clock-frequency" , NULL); |
628 | if (!value) |
629 | goto out; |
630 | cur_freq = (*value) / 1000; |
631 | |
632 | /* Check for 7447A based MacRISC3 */ |
633 | if (of_machine_is_compatible("MacRISC3" ) && |
634 | of_property_read_bool(cpunode, "dynamic-power-step" ) && |
635 | PVR_VER(mfspr(SPRN_PVR)) == 0x8003) { |
636 | pmac_cpufreq_init_7447A(cpunode); |
637 | |
638 | /* Allow dynamic switching */ |
639 | transition_latency = 8000000; |
640 | pmac_cpufreq_driver.flags &= ~CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING; |
641 | /* Check for other MacRISC3 machines */ |
642 | } else if (of_machine_is_compatible(compat: "PowerBook3,4" ) || |
643 | of_machine_is_compatible(compat: "PowerBook3,5" ) || |
644 | of_machine_is_compatible(compat: "MacRISC3" )) { |
645 | pmac_cpufreq_init_MacRISC3(cpunode); |
646 | /* Else check for iBook2 500/600 */ |
647 | } else if (of_machine_is_compatible(compat: "PowerBook4,1" )) { |
648 | hi_freq = cur_freq; |
649 | low_freq = 400000; |
650 | set_speed_proc = pmu_set_cpu_speed; |
651 | is_pmu_based = 1; |
652 | } |
653 | /* Else check for TiPb 550 */ |
654 | else if (of_machine_is_compatible(compat: "PowerBook3,3" ) && cur_freq == 550000) { |
655 | hi_freq = cur_freq; |
656 | low_freq = 500000; |
657 | set_speed_proc = pmu_set_cpu_speed; |
658 | is_pmu_based = 1; |
659 | } |
660 | /* Else check for TiPb 400 & 500 */ |
661 | else if (of_machine_is_compatible(compat: "PowerBook3,2" )) { |
662 | /* We only know about the 400 MHz and the 500Mhz model |
663 | * they both have 300 MHz as low frequency |
664 | */ |
665 | if (cur_freq < 350000 || cur_freq > 550000) |
666 | goto out; |
667 | hi_freq = cur_freq; |
668 | low_freq = 300000; |
669 | set_speed_proc = pmu_set_cpu_speed; |
670 | is_pmu_based = 1; |
671 | } |
672 | /* Else check for 750FX */ |
673 | else if (PVR_VER(mfspr(SPRN_PVR)) == 0x7000) |
674 | pmac_cpufreq_init_750FX(cpunode); |
675 | out: |
676 | of_node_put(node: cpunode); |
677 | if (set_speed_proc == NULL) |
678 | return -ENODEV; |
679 | |
680 | pmac_cpu_freqs[CPUFREQ_LOW].frequency = low_freq; |
681 | pmac_cpu_freqs[CPUFREQ_HIGH].frequency = hi_freq; |
682 | ppc_proc_freq = cur_freq * 1000ul; |
683 | |
684 | pr_info("Registering PowerMac CPU frequency driver\n" ); |
685 | pr_info("Low: %d Mhz, High: %d Mhz, Boot: %d Mhz\n" , |
686 | low_freq/1000, hi_freq/1000, cur_freq/1000); |
687 | |
688 | return cpufreq_register_driver(driver_data: &pmac_cpufreq_driver); |
689 | } |
690 | |
691 | module_init(pmac_cpufreq_setup); |
692 | |
693 | |