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[mirror_ubuntu-zesty-kernel.git] / drivers / cpufreq / pmac32-cpufreq.c
1 /*
2 * 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
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/errno.h>
21 #include <linux/kernel.h>
22 #include <linux/delay.h>
23 #include <linux/sched.h>
24 #include <linux/adb.h>
25 #include <linux/pmu.h>
26 #include <linux/cpufreq.h>
27 #include <linux/init.h>
28 #include <linux/device.h>
29 #include <linux/hardirq.h>
30 #include <linux/of_device.h>
31 #include <asm/prom.h>
32 #include <asm/machdep.h>
33 #include <asm/irq.h>
34 #include <asm/pmac_feature.h>
35 #include <asm/mmu_context.h>
36 #include <asm/sections.h>
37 #include <asm/cputable.h>
38 #include <asm/time.h>
39 #include <asm/mpic.h>
40 #include <asm/keylargo.h>
41 #include <asm/switch_to.h>
42
43 /* WARNING !!! This will cause calibrate_delay() to be called,
44 * but this is an __init function ! So you MUST go edit
45 * init/main.c to make it non-init before enabling DEBUG_FREQ
46 */
47 #undef DEBUG_FREQ
48
49 extern void low_choose_7447a_dfs(int dfs);
50 extern void low_choose_750fx_pll(int pll);
51 extern void low_sleep_handler(void);
52
53 /*
54 * Currently, PowerMac cpufreq supports only high & low frequencies
55 * that are set by the firmware
56 */
57 static unsigned int low_freq;
58 static unsigned int hi_freq;
59 static unsigned int cur_freq;
60 static unsigned int sleep_freq;
61 static unsigned long transition_latency;
62
63 /*
64 * Different models uses different mechanisms to switch the frequency
65 */
66 static int (*set_speed_proc)(int low_speed);
67 static unsigned int (*get_speed_proc)(void);
68
69 /*
70 * Some definitions used by the various speedprocs
71 */
72 static u32 voltage_gpio;
73 static u32 frequency_gpio;
74 static u32 slew_done_gpio;
75 static int no_schedule;
76 static int has_cpu_l2lve;
77 static int is_pmu_based;
78
79 /* There are only two frequency states for each processor. Values
80 * are in kHz for the time being.
81 */
82 #define CPUFREQ_HIGH 0
83 #define CPUFREQ_LOW 1
84
85 static struct cpufreq_frequency_table pmac_cpu_freqs[] = {
86 {0, CPUFREQ_HIGH, 0},
87 {0, CPUFREQ_LOW, 0},
88 {0, 0, CPUFREQ_TABLE_END},
89 };
90
91 static inline void local_delay(unsigned long ms)
92 {
93 if (no_schedule)
94 mdelay(ms);
95 else
96 msleep(ms);
97 }
98
99 #ifdef DEBUG_FREQ
100 static inline void debug_calc_bogomips(void)
101 {
102 /* This will cause a recalc of bogomips and display the
103 * result. We backup/restore the value to avoid affecting the
104 * core cpufreq framework's own calculation.
105 */
106 unsigned long save_lpj = loops_per_jiffy;
107 calibrate_delay();
108 loops_per_jiffy = save_lpj;
109 }
110 #endif /* DEBUG_FREQ */
111
112 /* Switch CPU speed under 750FX CPU control
113 */
114 static int cpu_750fx_cpu_speed(int low_speed)
115 {
116 u32 hid2;
117
118 if (low_speed == 0) {
119 /* ramping up, set voltage first */
120 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
121 /* Make sure we sleep for at least 1ms */
122 local_delay(10);
123
124 /* tweak L2 for high voltage */
125 if (has_cpu_l2lve) {
126 hid2 = mfspr(SPRN_HID2);
127 hid2 &= ~0x2000;
128 mtspr(SPRN_HID2, hid2);
129 }
130 }
131 #ifdef CONFIG_6xx
132 low_choose_750fx_pll(low_speed);
133 #endif
134 if (low_speed == 1) {
135 /* tweak L2 for low voltage */
136 if (has_cpu_l2lve) {
137 hid2 = mfspr(SPRN_HID2);
138 hid2 |= 0x2000;
139 mtspr(SPRN_HID2, hid2);
140 }
141
142 /* ramping down, set voltage last */
143 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
144 local_delay(10);
145 }
146
147 return 0;
148 }
149
150 static unsigned int cpu_750fx_get_cpu_speed(void)
151 {
152 if (mfspr(SPRN_HID1) & HID1_PS)
153 return low_freq;
154 else
155 return hi_freq;
156 }
157
158 /* Switch CPU speed using DFS */
159 static int dfs_set_cpu_speed(int low_speed)
160 {
161 if (low_speed == 0) {
162 /* ramping up, set voltage first */
163 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
164 /* Make sure we sleep for at least 1ms */
165 local_delay(1);
166 }
167
168 /* set frequency */
169 #ifdef CONFIG_6xx
170 low_choose_7447a_dfs(low_speed);
171 #endif
172 udelay(100);
173
174 if (low_speed == 1) {
175 /* ramping down, set voltage last */
176 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
177 local_delay(1);
178 }
179
180 return 0;
181 }
182
183 static unsigned int dfs_get_cpu_speed(void)
184 {
185 if (mfspr(SPRN_HID1) & HID1_DFS)
186 return low_freq;
187 else
188 return hi_freq;
189 }
190
191
192 /* Switch CPU speed using slewing GPIOs
193 */
194 static int gpios_set_cpu_speed(int low_speed)
195 {
196 int gpio, timeout = 0;
197
198 /* If ramping up, set voltage first */
199 if (low_speed == 0) {
200 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
201 /* Delay is way too big but it's ok, we schedule */
202 local_delay(10);
203 }
204
205 /* Set frequency */
206 gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0);
207 if (low_speed == ((gpio & 0x01) == 0))
208 goto skip;
209
210 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, frequency_gpio,
211 low_speed ? 0x04 : 0x05);
212 udelay(200);
213 do {
214 if (++timeout > 100)
215 break;
216 local_delay(1);
217 gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, slew_done_gpio, 0);
218 } while((gpio & 0x02) == 0);
219 skip:
220 /* If ramping down, set voltage last */
221 if (low_speed == 1) {
222 pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
223 /* Delay is way too big but it's ok, we schedule */
224 local_delay(10);
225 }
226
227 #ifdef DEBUG_FREQ
228 debug_calc_bogomips();
229 #endif
230
231 return 0;
232 }
233
234 /* Switch CPU speed under PMU control
235 */
236 static int pmu_set_cpu_speed(int low_speed)
237 {
238 struct adb_request req;
239 unsigned long save_l2cr;
240 unsigned long save_l3cr;
241 unsigned int pic_prio;
242 unsigned long flags;
243
244 preempt_disable();
245
246 #ifdef DEBUG_FREQ
247 printk(KERN_DEBUG "HID1, before: %x\n", mfspr(SPRN_HID1));
248 #endif
249 pmu_suspend();
250
251 /* Disable all interrupt sources on openpic */
252 pic_prio = mpic_cpu_get_priority();
253 mpic_cpu_set_priority(0xf);
254
255 /* Make sure the decrementer won't interrupt us */
256 asm volatile("mtdec %0" : : "r" (0x7fffffff));
257 /* Make sure any pending DEC interrupt occurring while we did
258 * the above didn't re-enable the DEC */
259 mb();
260 asm volatile("mtdec %0" : : "r" (0x7fffffff));
261
262 /* We can now disable MSR_EE */
263 local_irq_save(flags);
264
265 /* Giveup the FPU & vec */
266 enable_kernel_fp();
267
268 #ifdef CONFIG_ALTIVEC
269 if (cpu_has_feature(CPU_FTR_ALTIVEC))
270 enable_kernel_altivec();
271 #endif /* CONFIG_ALTIVEC */
272
273 /* Save & disable L2 and L3 caches */
274 save_l3cr = _get_L3CR(); /* (returns -1 if not available) */
275 save_l2cr = _get_L2CR(); /* (returns -1 if not available) */
276
277 /* Send the new speed command. My assumption is that this command
278 * will cause PLL_CFG[0..3] to be changed next time CPU goes to sleep
279 */
280 pmu_request(&req, NULL, 6, PMU_CPU_SPEED, 'W', 'O', 'O', 'F', low_speed);
281 while (!req.complete)
282 pmu_poll();
283
284 /* Prepare the northbridge for the speed transition */
285 pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,1);
286
287 /* Call low level code to backup CPU state and recover from
288 * hardware reset
289 */
290 low_sleep_handler();
291
292 /* Restore the northbridge */
293 pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,0);
294
295 /* Restore L2 cache */
296 if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0)
297 _set_L2CR(save_l2cr);
298 /* Restore L3 cache */
299 if (save_l3cr != 0xffffffff && (save_l3cr & L3CR_L3E) != 0)
300 _set_L3CR(save_l3cr);
301
302 /* Restore userland MMU context */
303 switch_mmu_context(NULL, current->active_mm, NULL);
304
305 #ifdef DEBUG_FREQ
306 printk(KERN_DEBUG "HID1, after: %x\n", mfspr(SPRN_HID1));
307 #endif
308
309 /* Restore low level PMU operations */
310 pmu_unlock();
311
312 /*
313 * Restore decrementer; we'll take a decrementer interrupt
314 * as soon as interrupts are re-enabled and the generic
315 * clockevents code will reprogram it with the right value.
316 */
317 set_dec(1);
318
319 /* Restore interrupts */
320 mpic_cpu_set_priority(pic_prio);
321
322 /* Let interrupts flow again ... */
323 local_irq_restore(flags);
324
325 #ifdef DEBUG_FREQ
326 debug_calc_bogomips();
327 #endif
328
329 pmu_resume();
330
331 preempt_enable();
332
333 return 0;
334 }
335
336 static int do_set_cpu_speed(struct cpufreq_policy *policy, int speed_mode)
337 {
338 unsigned long l3cr;
339 static unsigned long prev_l3cr;
340
341 if (speed_mode == CPUFREQ_LOW &&
342 cpu_has_feature(CPU_FTR_L3CR)) {
343 l3cr = _get_L3CR();
344 if (l3cr & L3CR_L3E) {
345 prev_l3cr = l3cr;
346 _set_L3CR(0);
347 }
348 }
349 set_speed_proc(speed_mode == CPUFREQ_LOW);
350 if (speed_mode == CPUFREQ_HIGH &&
351 cpu_has_feature(CPU_FTR_L3CR)) {
352 l3cr = _get_L3CR();
353 if ((prev_l3cr & L3CR_L3E) && l3cr != prev_l3cr)
354 _set_L3CR(prev_l3cr);
355 }
356 cur_freq = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq;
357
358 return 0;
359 }
360
361 static unsigned int pmac_cpufreq_get_speed(unsigned int cpu)
362 {
363 return cur_freq;
364 }
365
366 static int pmac_cpufreq_target( struct cpufreq_policy *policy,
367 unsigned int index)
368 {
369 int rc;
370
371 rc = do_set_cpu_speed(policy, index);
372
373 ppc_proc_freq = cur_freq * 1000ul;
374 return rc;
375 }
376
377 static int pmac_cpufreq_cpu_init(struct cpufreq_policy *policy)
378 {
379 return cpufreq_generic_init(policy, pmac_cpu_freqs, transition_latency);
380 }
381
382 static u32 read_gpio(struct device_node *np)
383 {
384 const u32 *reg = of_get_property(np, "reg", NULL);
385 u32 offset;
386
387 if (reg == NULL)
388 return 0;
389 /* That works for all keylargos but shall be fixed properly
390 * some day... The problem is that it seems we can't rely
391 * on the "reg" property of the GPIO nodes, they are either
392 * relative to the base of KeyLargo or to the base of the
393 * GPIO space, and the device-tree doesn't help.
394 */
395 offset = *reg;
396 if (offset < KEYLARGO_GPIO_LEVELS0)
397 offset += KEYLARGO_GPIO_LEVELS0;
398 return offset;
399 }
400
401 static int pmac_cpufreq_suspend(struct cpufreq_policy *policy)
402 {
403 /* Ok, this could be made a bit smarter, but let's be robust for now. We
404 * always force a speed change to high speed before sleep, to make sure
405 * we have appropriate voltage and/or bus speed for the wakeup process,
406 * and to make sure our loops_per_jiffies are "good enough", that is will
407 * not cause too short delays if we sleep in low speed and wake in high
408 * speed..
409 */
410 no_schedule = 1;
411 sleep_freq = cur_freq;
412 if (cur_freq == low_freq && !is_pmu_based)
413 do_set_cpu_speed(policy, CPUFREQ_HIGH);
414 return 0;
415 }
416
417 static int pmac_cpufreq_resume(struct cpufreq_policy *policy)
418 {
419 /* If we resume, first check if we have a get() function */
420 if (get_speed_proc)
421 cur_freq = get_speed_proc();
422 else
423 cur_freq = 0;
424
425 /* We don't, hrm... we don't really know our speed here, best
426 * is that we force a switch to whatever it was, which is
427 * probably high speed due to our suspend() routine
428 */
429 do_set_cpu_speed(policy, sleep_freq == low_freq ?
430 CPUFREQ_LOW : CPUFREQ_HIGH);
431
432 ppc_proc_freq = cur_freq * 1000ul;
433
434 no_schedule = 0;
435 return 0;
436 }
437
438 static struct cpufreq_driver pmac_cpufreq_driver = {
439 .verify = cpufreq_generic_frequency_table_verify,
440 .target_index = pmac_cpufreq_target,
441 .get = pmac_cpufreq_get_speed,
442 .init = pmac_cpufreq_cpu_init,
443 .suspend = pmac_cpufreq_suspend,
444 .resume = pmac_cpufreq_resume,
445 .flags = CPUFREQ_PM_NO_WARN,
446 .attr = cpufreq_generic_attr,
447 .name = "powermac",
448 };
449
450
451 static int pmac_cpufreq_init_MacRISC3(struct device_node *cpunode)
452 {
453 struct device_node *volt_gpio_np = of_find_node_by_name(NULL,
454 "voltage-gpio");
455 struct device_node *freq_gpio_np = of_find_node_by_name(NULL,
456 "frequency-gpio");
457 struct device_node *slew_done_gpio_np = of_find_node_by_name(NULL,
458 "slewing-done");
459 const u32 *value;
460
461 /*
462 * Check to see if it's GPIO driven or PMU only
463 *
464 * The way we extract the GPIO address is slightly hackish, but it
465 * works well enough for now. We need to abstract the whole GPIO
466 * stuff sooner or later anyway
467 */
468
469 if (volt_gpio_np)
470 voltage_gpio = read_gpio(volt_gpio_np);
471 if (freq_gpio_np)
472 frequency_gpio = read_gpio(freq_gpio_np);
473 if (slew_done_gpio_np)
474 slew_done_gpio = read_gpio(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(cpunode, "bus-frequencies", &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(cpunode, "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(cpunode, "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(cpunode, "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_get_property(cpunode, "dynamic-power-step", NULL) == NULL)
549 return 1;
550
551 volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
552 if (volt_gpio_np)
553 voltage_gpio = read_gpio(volt_gpio_np);
554 if (!voltage_gpio){
555 pr_err("missing cpu-vcore-select gpio\n");
556 return 1;
557 }
558
559 /* OF only reports the high frequency */
560 hi_freq = cur_freq;
561 low_freq = cur_freq/2;
562
563 /* Read actual frequency from CPU */
564 cur_freq = dfs_get_cpu_speed();
565 set_speed_proc = dfs_set_cpu_speed;
566 get_speed_proc = dfs_get_cpu_speed;
567
568 return 0;
569 }
570
571 static int pmac_cpufreq_init_750FX(struct device_node *cpunode)
572 {
573 struct device_node *volt_gpio_np;
574 u32 pvr;
575 const u32 *value;
576
577 if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL)
578 return 1;
579
580 hi_freq = cur_freq;
581 value = of_get_property(cpunode, "reduced-clock-frequency", NULL);
582 if (!value)
583 return 1;
584 low_freq = (*value) / 1000;
585
586 volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
587 if (volt_gpio_np)
588 voltage_gpio = read_gpio(volt_gpio_np);
589
590 pvr = mfspr(SPRN_PVR);
591 has_cpu_l2lve = !((pvr & 0xf00) == 0x100);
592
593 set_speed_proc = cpu_750fx_cpu_speed;
594 get_speed_proc = cpu_750fx_get_cpu_speed;
595 cur_freq = cpu_750fx_get_cpu_speed();
596
597 return 0;
598 }
599
600 /* Currently, we support the following machines:
601 *
602 * - Titanium PowerBook 1Ghz (PMU based, 667Mhz & 1Ghz)
603 * - Titanium PowerBook 800 (PMU based, 667Mhz & 800Mhz)
604 * - Titanium PowerBook 400 (PMU based, 300Mhz & 400Mhz)
605 * - Titanium PowerBook 500 (PMU based, 300Mhz & 500Mhz)
606 * - iBook2 500/600 (PMU based, 400Mhz & 500/600Mhz)
607 * - iBook2 700 (CPU based, 400Mhz & 700Mhz, support low voltage)
608 * - Recent MacRISC3 laptops
609 * - All new machines with 7447A CPUs
610 */
611 static int __init pmac_cpufreq_setup(void)
612 {
613 struct device_node *cpunode;
614 const u32 *value;
615
616 if (strstr(boot_command_line, "nocpufreq"))
617 return 0;
618
619 /* Get first CPU node */
620 cpunode = of_cpu_device_node_get(0);
621 if (!cpunode)
622 goto out;
623
624 /* Get current cpu clock freq */
625 value = of_get_property(cpunode, "clock-frequency", NULL);
626 if (!value)
627 goto out;
628 cur_freq = (*value) / 1000;
629 transition_latency = CPUFREQ_ETERNAL;
630
631 /* Check for 7447A based MacRISC3 */
632 if (of_machine_is_compatible("MacRISC3") &&
633 of_get_property(cpunode, "dynamic-power-step", NULL) &&
634 PVR_VER(mfspr(SPRN_PVR)) == 0x8003) {
635 pmac_cpufreq_init_7447A(cpunode);
636 transition_latency = 8000000;
637 /* Check for other MacRISC3 machines */
638 } else if (of_machine_is_compatible("PowerBook3,4") ||
639 of_machine_is_compatible("PowerBook3,5") ||
640 of_machine_is_compatible("MacRISC3")) {
641 pmac_cpufreq_init_MacRISC3(cpunode);
642 /* Else check for iBook2 500/600 */
643 } else if (of_machine_is_compatible("PowerBook4,1")) {
644 hi_freq = cur_freq;
645 low_freq = 400000;
646 set_speed_proc = pmu_set_cpu_speed;
647 is_pmu_based = 1;
648 }
649 /* Else check for TiPb 550 */
650 else if (of_machine_is_compatible("PowerBook3,3") && cur_freq == 550000) {
651 hi_freq = cur_freq;
652 low_freq = 500000;
653 set_speed_proc = pmu_set_cpu_speed;
654 is_pmu_based = 1;
655 }
656 /* Else check for TiPb 400 & 500 */
657 else if (of_machine_is_compatible("PowerBook3,2")) {
658 /* We only know about the 400 MHz and the 500Mhz model
659 * they both have 300 MHz as low frequency
660 */
661 if (cur_freq < 350000 || cur_freq > 550000)
662 goto out;
663 hi_freq = cur_freq;
664 low_freq = 300000;
665 set_speed_proc = pmu_set_cpu_speed;
666 is_pmu_based = 1;
667 }
668 /* Else check for 750FX */
669 else if (PVR_VER(mfspr(SPRN_PVR)) == 0x7000)
670 pmac_cpufreq_init_750FX(cpunode);
671 out:
672 of_node_put(cpunode);
673 if (set_speed_proc == NULL)
674 return -ENODEV;
675
676 pmac_cpu_freqs[CPUFREQ_LOW].frequency = low_freq;
677 pmac_cpu_freqs[CPUFREQ_HIGH].frequency = hi_freq;
678 ppc_proc_freq = cur_freq * 1000ul;
679
680 pr_info("Registering PowerMac CPU frequency driver\n");
681 pr_info("Low: %d Mhz, High: %d Mhz, Boot: %d Mhz\n",
682 low_freq/1000, hi_freq/1000, cur_freq/1000);
683
684 return cpufreq_register_driver(&pmac_cpufreq_driver);
685 }
686
687 module_init(pmac_cpufreq_setup);
688