summaryrefslogtreecommitdiffstats
path: root/drivers/cpufreq/pmac32-cpufreq.c
blob: 52f0d91d30c17eb0a721a55c839488f7b8e652e4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
/*
 *  Copyright (C) 2002 - 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
 *  Copyright (C) 2004        John Steele Scott <toojays@toojays.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * TODO: Need a big cleanup here. Basically, we need to have different
 * cpufreq_driver structures for the different type of HW instead of the
 * current mess. We also need to better deal with the detection of the
 * type of machine.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/adb.h>
#include <linux/pmu.h>
#include <linux/cpufreq.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/hardirq.h>
#include <linux/of_device.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/irq.h>
#include <asm/pmac_feature.h>
#include <asm/mmu_context.h>
#include <asm/sections.h>
#include <asm/cputable.h>
#include <asm/time.h>
#include <asm/mpic.h>
#include <asm/keylargo.h>
#include <asm/switch_to.h>

/* WARNING !!! This will cause calibrate_delay() to be called,
 * but this is an __init function ! So you MUST go edit
 * init/main.c to make it non-init before enabling DEBUG_FREQ
 */
#undef DEBUG_FREQ

extern void low_choose_7447a_dfs(int dfs);
extern void low_choose_750fx_pll(int pll);
extern void low_sleep_handler(void);

/*
 * Currently, PowerMac cpufreq supports only high & low frequencies
 * that are set by the firmware
 */
static unsigned int low_freq;
static unsigned int hi_freq;
static unsigned int cur_freq;
static unsigned int sleep_freq;
static unsigned long transition_latency;

/*
 * Different models uses different mechanisms to switch the frequency
 */
static int (*set_speed_proc)(int low_speed);
static unsigned int (*get_speed_proc)(void);

/*
 * Some definitions used by the various speedprocs
 */
static u32 voltage_gpio;
static u32 frequency_gpio;
static u32 slew_done_gpio;
static int no_schedule;
static int has_cpu_l2lve;
static int is_pmu_based;

/* There are only two frequency states for each processor. Values
 * are in kHz for the time being.
 */
#define CPUFREQ_HIGH                  0
#define CPUFREQ_LOW                   1

static struct cpufreq_frequency_table pmac_cpu_freqs[] = {
	{0, CPUFREQ_HIGH,	0},
	{0, CPUFREQ_LOW,	0},
	{0, 0,			CPUFREQ_TABLE_END},
};

static inline void local_delay(unsigned long ms)
{
	if (no_schedule)
		mdelay(ms);
	else
		msleep(ms);
}

#ifdef DEBUG_FREQ
static inline void debug_calc_bogomips(void)
{
	/* This will cause a recalc of bogomips and display the
	 * result. We backup/restore the value to avoid affecting the
	 * core cpufreq framework's own calculation.
	 */
	unsigned long save_lpj = loops_per_jiffy;
	calibrate_delay();
	loops_per_jiffy = save_lpj;
}
#endif /* DEBUG_FREQ */

/* Switch CPU speed under 750FX CPU control
 */
static int cpu_750fx_cpu_speed(int low_speed)
{
	u32 hid2;

	if (low_speed == 0) {
		/* ramping up, set voltage first */
		pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
		/* Make sure we sleep for at least 1ms */
		local_delay(10);

		/* tweak L2 for high voltage */
		if (has_cpu_l2lve) {
			hid2 = mfspr(SPRN_HID2);
			hid2 &= ~0x2000;
			mtspr(SPRN_HID2, hid2);
		}
	}
#ifdef CONFIG_PPC_BOOK3S_32
	low_choose_750fx_pll(low_speed);
#endif
	if (low_speed == 1) {
		/* tweak L2 for low voltage */
		if (has_cpu_l2lve) {
			hid2 = mfspr(SPRN_HID2);
			hid2 |= 0x2000;
			mtspr(SPRN_HID2, hid2);
		}

		/* ramping down, set voltage last */
		pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
		local_delay(10);
	}

	return 0;
}

static unsigned int cpu_750fx_get_cpu_speed(void)
{
	if (mfspr(SPRN_HID1) & HID1_PS)
		return low_freq;
	else
		return hi_freq;
}

/* Switch CPU speed using DFS */
static int dfs_set_cpu_speed(int low_speed)
{
	if (low_speed == 0) {
		/* ramping up, set voltage first */
		pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
		/* Make sure we sleep for at least 1ms */
		local_delay(1);
	}

	/* set frequency */
#ifdef CONFIG_PPC_BOOK3S_32
	low_choose_7447a_dfs(low_speed);
#endif
	udelay(100);

	if (low_speed == 1) {
		/* ramping down, set voltage last */
		pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
		local_delay(1);
	}

	return 0;
}

static unsigned int dfs_get_cpu_speed(void)
{
	if (mfspr(SPRN_HID1) & HID1_DFS)
		return low_freq;
	else
		return hi_freq;
}


/* Switch CPU speed using slewing GPIOs
 */
static int gpios_set_cpu_speed(int low_speed)
{
	int gpio, timeout = 0;

	/* If ramping up, set voltage first */
	if (low_speed == 0) {
		pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
		/* Delay is way too big but it's ok, we schedule */
		local_delay(10);
	}

	/* Set frequency */
	gpio = 	pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0);
	if (low_speed == ((gpio & 0x01) == 0))
		goto skip;

	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, frequency_gpio,
			  low_speed ? 0x04 : 0x05);
	udelay(200);
	do {
		if (++timeout > 100)
			break;
		local_delay(1);
		gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, slew_done_gpio, 0);
	} while((gpio & 0x02) == 0);
 skip:
	/* If ramping down, set voltage last */
	if (low_speed == 1) {
		pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
		/* Delay is way too big but it's ok, we schedule */
		local_delay(10);
	}

#ifdef DEBUG_FREQ
	debug_calc_bogomips();
#endif

	return 0;
}

/* Switch CPU speed under PMU control
 */
static int pmu_set_cpu_speed(int low_speed)
{
	struct adb_request req;
	unsigned long save_l2cr;
	unsigned long save_l3cr;
	unsigned int pic_prio;
	unsigned long flags;

	preempt_disable();

#ifdef DEBUG_FREQ
	printk(KERN_DEBUG "HID1, before: %x\n", mfspr(SPRN_HID1));
#endif
	pmu_suspend();

	/* Disable all interrupt sources on openpic */
 	pic_prio = mpic_cpu_get_priority();
	mpic_cpu_set_priority(0xf);

	/* Make sure the decrementer won't interrupt us */
	asm volatile("mtdec %0" : : "r" (0x7fffffff));
	/* Make sure any pending DEC interrupt occurring while we did
	 * the above didn't re-enable the DEC */
	mb();
	asm volatile("mtdec %0" : : "r" (0x7fffffff));

	/* We can now disable MSR_EE */
	local_irq_save(flags);

	/* Giveup the FPU & vec */
	enable_kernel_fp();

#ifdef CONFIG_ALTIVEC
	if (cpu_has_feature(CPU_FTR_ALTIVEC))
		enable_kernel_altivec();
#endif /* CONFIG_ALTIVEC */

	/* Save & disable L2 and L3 caches */
	save_l3cr = _get_L3CR();	/* (returns -1 if not available) */
	save_l2cr = _get_L2CR();	/* (returns -1 if not available) */

	/* Send the new speed command. My assumption is that this command
	 * will cause PLL_CFG[0..3] to be changed next time CPU goes to sleep
	 */
	pmu_request(&req, NULL, 6, PMU_CPU_SPEED, 'W', 'O', 'O', 'F', low_speed);
	while (!req.complete)
		pmu_poll();

	/* Prepare the northbridge for the speed transition */
	pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,1);

	/* Call low level code to backup CPU state and recover from
	 * hardware reset
	 */
	low_sleep_handler();

	/* Restore the northbridge */
	pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,0);

	/* Restore L2 cache */
	if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0)
 		_set_L2CR(save_l2cr);
	/* Restore L3 cache */
	if (save_l3cr != 0xffffffff && (save_l3cr & L3CR_L3E) != 0)
 		_set_L3CR(save_l3cr);

	/* Restore userland MMU context */
	switch_mmu_context(NULL, current->active_mm, NULL);

#ifdef DEBUG_FREQ
	printk(KERN_DEBUG "HID1, after: %x\n", mfspr(SPRN_HID1));
#endif

	/* Restore low level PMU operations */
	pmu_unlock();

	/*
	 * Restore decrementer; we'll take a decrementer interrupt
	 * as soon as interrupts are re-enabled and the generic
	 * clockevents code will reprogram it with the right value.
	 */
	set_dec(1);

	/* Restore interrupts */
 	mpic_cpu_set_priority(pic_prio);

	/* Let interrupts flow again ... */
	local_irq_restore(flags);

#ifdef DEBUG_FREQ
	debug_calc_bogomips();
#endif

	pmu_resume();

	preempt_enable();

	return 0;
}

static int do_set_cpu_speed(struct cpufreq_policy *policy, int speed_mode)
{
	unsigned long l3cr;
	static unsigned long prev_l3cr;

	if (speed_mode == CPUFREQ_LOW &&
	    cpu_has_feature(CPU_FTR_L3CR)) {
		l3cr = _get_L3CR();
		if (l3cr & L3CR_L3E) {
			prev_l3cr = l3cr;
			_set_L3CR(0);
		}
	}
	set_speed_proc(speed_mode == CPUFREQ_LOW);
	if (speed_mode == CPUFREQ_HIGH &&
	    cpu_has_feature(CPU_FTR_L3CR)) {
		l3cr = _get_L3CR();
		if ((prev_l3cr & L3CR_L3E) && l3cr != prev_l3cr)
			_set_L3CR(prev_l3cr);
	}
	cur_freq = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq;

	return 0;
}

static unsigned int pmac_cpufreq_get_speed(unsigned int cpu)
{
	return cur_freq;
}

static int pmac_cpufreq_target(	struct cpufreq_policy *policy,
					unsigned int index)
{
	int		rc;

	rc = do_set_cpu_speed(policy, index);

	ppc_proc_freq = cur_freq * 1000ul;
	return rc;
}

static int pmac_cpufreq_cpu_init(struct cpufreq_policy *policy)
{
	return cpufreq_generic_init(policy, pmac_cpu_freqs, transition_latency);
}

static u32 read_gpio(struct device_node *np)
{
	const u32 *reg = of_get_property(np, "reg", NULL);
	u32 offset;

	if (reg == NULL)
		return 0;
	/* That works for all keylargos but shall be fixed properly
	 * some day... The problem is that it seems we can't rely
	 * on the "reg" property of the GPIO nodes, they are either
	 * relative to the base of KeyLargo or to the base of the
	 * GPIO space, and the device-tree doesn't help.
	 */
	offset = *reg;
	if (offset < KEYLARGO_GPIO_LEVELS0)
		offset += KEYLARGO_GPIO_LEVELS0;
	return offset;
}

static int pmac_cpufreq_suspend(struct cpufreq_policy *policy)
{
	/* Ok, this could be made a bit smarter, but let's be robust for now. We
	 * always force a speed change to high speed before sleep, to make sure
	 * we have appropriate voltage and/or bus speed for the wakeup process,
	 * and to make sure our loops_per_jiffies are "good enough", that is will
	 * not cause too short delays if we sleep in low speed and wake in high
	 * speed..
	 */
	no_schedule = 1;
	sleep_freq = cur_freq;
	if (cur_freq == low_freq && !is_pmu_based)
		do_set_cpu_speed(policy, CPUFREQ_HIGH);
	return 0;
}

static int pmac_cpufreq_resume(struct cpufreq_policy *policy)
{
	/* If we resume, first check if we have a get() function */
	if (get_speed_proc)
		cur_freq = get_speed_proc();
	else
		cur_freq = 0;

	/* We don't, hrm... we don't really know our speed here, best
	 * is that we force a switch to whatever it was, which is
	 * probably high speed due to our suspend() routine
	 */
	do_set_cpu_speed(policy, sleep_freq == low_freq ?
			 CPUFREQ_LOW : CPUFREQ_HIGH);

	ppc_proc_freq = cur_freq * 1000ul;

	no_schedule = 0;
	return 0;
}

static struct cpufreq_driver pmac_cpufreq_driver = {
	.verify 	= cpufreq_generic_frequency_table_verify,
	.target_index	= pmac_cpufreq_target,
	.get		= pmac_cpufreq_get_speed,
	.init		= pmac_cpufreq_cpu_init,
	.suspend	= pmac_cpufreq_suspend,
	.resume		= pmac_cpufreq_resume,
	.flags		= CPUFREQ_PM_NO_WARN |
			  CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING,
	.attr		= cpufreq_generic_attr,
	.name		= "powermac",
};


static int pmac_cpufreq_init_MacRISC3(struct device_node *cpunode)
{
	struct device_node *volt_gpio_np = of_find_node_by_name(NULL,
								"voltage-gpio");
	struct device_node *freq_gpio_np = of_find_node_by_name(NULL,
								"frequency-gpio");
	struct device_node *slew_done_gpio_np = of_find_node_by_name(NULL,
								     "slewing-done");
	const u32 *value;

	/*
	 * Check to see if it's GPIO driven or PMU only
	 *
	 * The way we extract the GPIO address is slightly hackish, but it
	 * works well enough for now. We need to abstract the whole GPIO
	 * stuff sooner or later anyway
	 */

	if (volt_gpio_np)
		voltage_gpio = read_gpio(volt_gpio_np);
	if (freq_gpio_np)
		frequency_gpio = read_gpio(freq_gpio_np);
	if (slew_done_gpio_np)
		slew_done_gpio = read_gpio(slew_done_gpio_np);

	/* If we use the frequency GPIOs, calculate the min/max speeds based
	 * on the bus frequencies
	 */
	if (frequency_gpio && slew_done_gpio) {
		int lenp, rc;
		const u32 *freqs, *ratio;

		freqs = of_get_property(cpunode, "bus-frequencies", &lenp);
		lenp /= sizeof(u32);
		if (freqs == NULL || lenp != 2) {
			pr_err("bus-frequencies incorrect or missing\n");
			return 1;
		}
		ratio = of_get_property(cpunode, "processor-to-bus-ratio*2",
						NULL);
		if (ratio == NULL) {
			pr_err("processor-to-bus-ratio*2 missing\n");
			return 1;
		}

		/* Get the min/max bus frequencies */
		low_freq = min(freqs[0], freqs[1]);
		hi_freq = max(freqs[0], freqs[1]);

		/* Grrrr.. It _seems_ that the device-tree is lying on the low bus
		 * frequency, it claims it to be around 84Mhz on some models while
		 * it appears to be approx. 101Mhz on all. Let's hack around here...
		 * fortunately, we don't need to be too precise
		 */
		if (low_freq < 98000000)
			low_freq = 101000000;

		/* Convert those to CPU core clocks */
		low_freq = (low_freq * (*ratio)) / 2000;
		hi_freq = (hi_freq * (*ratio)) / 2000;

		/* Now we get the frequencies, we read the GPIO to see what is out current
		 * speed
		 */
		rc = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0);
		cur_freq = (rc & 0x01) ? hi_freq : low_freq;

		set_speed_proc = gpios_set_cpu_speed;
		return 1;
	}

	/* If we use the PMU, look for the min & max frequencies in the
	 * device-tree
	 */
	value = of_get_property(cpunode, "min-clock-frequency", NULL);
	if (!value)
		return 1;
	low_freq = (*value) / 1000;
	/* The PowerBook G4 12" (PowerBook6,1) has an error in the device-tree
	 * here */
	if (low_freq < 100000)
		low_freq *= 10;

	value = of_get_property(cpunode, "max-clock-frequency", NULL);
	if (!value)
		return 1;
	hi_freq = (*value) / 1000;
	set_speed_proc = pmu_set_cpu_speed;
	is_pmu_based = 1;

	return 0;
}

static int pmac_cpufreq_init_7447A(struct device_node *cpunode)
{
	struct device_node *volt_gpio_np;

	if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL)
		return 1;

	volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
	if (volt_gpio_np)
		voltage_gpio = read_gpio(volt_gpio_np);
	if (!voltage_gpio){
		pr_err("missing cpu-vcore-select gpio\n");
		return 1;
	}

	/* OF only reports the high frequency */
	hi_freq = cur_freq;
	low_freq = cur_freq/2;

	/* Read actual frequency from CPU */
	cur_freq = dfs_get_cpu_speed();
	set_speed_proc = dfs_set_cpu_speed;
	get_speed_proc = dfs_get_cpu_speed;

	return 0;
}

static int pmac_cpufreq_init_750FX(struct device_node *cpunode)
{
	struct device_node *volt_gpio_np;
	u32 pvr;
	const u32 *value;

	if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL)
		return 1;

	hi_freq = cur_freq;
	value = of_get_property(cpunode, "reduced-clock-frequency", NULL);
	if (!value)
		return 1;
	low_freq = (*value) / 1000;

	volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
	if (volt_gpio_np)
		voltage_gpio = read_gpio(volt_gpio_np);

	pvr = mfspr(SPRN_PVR);
	has_cpu_l2lve = !((pvr & 0xf00) == 0x100);

	set_speed_proc = cpu_750fx_cpu_speed;
	get_speed_proc = cpu_750fx_get_cpu_speed;
	cur_freq = cpu_750fx_get_cpu_speed();

	return 0;
}

/* Currently, we support the following machines:
 *
 *  - Titanium PowerBook 1Ghz (PMU based, 667Mhz & 1Ghz)
 *  - Titanium PowerBook 800 (PMU based, 667Mhz & 800Mhz)
 *  - Titanium PowerBook 400 (PMU based, 300Mhz & 400Mhz)
 *  - Titanium PowerBook 500 (PMU based, 300Mhz & 500Mhz)
 *  - iBook2 500/600 (PMU based, 400Mhz & 500/600Mhz)
 *  - iBook2 700 (CPU based, 400Mhz & 700Mhz, support low voltage)
 *  - Recent MacRISC3 laptops
 *  - All new machines with 7447A CPUs
 */
static int __init pmac_cpufreq_setup(void)
{
	struct device_node	*cpunode;
	const u32		*value;

	if (strstr(boot_command_line, "nocpufreq"))
		return 0;

	/* Get first CPU node */
	cpunode = of_cpu_device_node_get(0);
	if (!cpunode)
		goto out;

	/* Get current cpu clock freq */
	value = of_get_property(cpunode, "clock-frequency", NULL);
	if (!value)
		goto out;
	cur_freq = (*value) / 1000;

	/*  Check for 7447A based MacRISC3 */
	if (of_machine_is_compatible("MacRISC3") &&
	    of_get_property(cpunode, "dynamic-power-step", NULL) &&
	    PVR_VER(mfspr(SPRN_PVR)) == 0x8003) {
		pmac_cpufreq_init_7447A(cpunode);

		/* Allow dynamic switching */
		transition_latency = 8000000;
		pmac_cpufreq_driver.flags &= ~CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING;
	/* Check for other MacRISC3 machines */
	} else if (of_machine_is_compatible("PowerBook3,4") ||
		   of_machine_is_compatible("PowerBook3,5") ||
		   of_machine_is_compatible("MacRISC3")) {
		pmac_cpufreq_init_MacRISC3(cpunode);
	/* Else check for iBook2 500/600 */
	} else if (of_machine_is_compatible("PowerBook4,1")) {
		hi_freq = cur_freq;
		low_freq = 400000;
		set_speed_proc = pmu_set_cpu_speed;
		is_pmu_based = 1;
	}
	/* Else check for TiPb 550 */
	else if (of_machine_is_compatible("PowerBook3,3") && cur_freq == 550000) {
		hi_freq = cur_freq;
		low_freq = 500000;
		set_speed_proc = pmu_set_cpu_speed;
		is_pmu_based = 1;
	}
	/* Else check for TiPb 400 & 500 */
	else if (of_machine_is_compatible("PowerBook3,2")) {
		/* We only know about the 400 MHz and the 500Mhz model
		 * they both have 300 MHz as low frequency
		 */
		if (cur_freq < 350000 || cur_freq > 550000)
			goto out;
		hi_freq = cur_freq;
		low_freq = 300000;
		set_speed_proc = pmu_set_cpu_speed;
		is_pmu_based = 1;
	}
	/* Else check for 750FX */
	else if (PVR_VER(mfspr(SPRN_PVR)) == 0x7000)
		pmac_cpufreq_init_750FX(cpunode);
out:
	of_node_put(cpunode);
	if (set_speed_proc == NULL)
		return -ENODEV;

	pmac_cpu_freqs[CPUFREQ_LOW].frequency = low_freq;
	pmac_cpu_freqs[CPUFREQ_HIGH].frequency = hi_freq;
	ppc_proc_freq = cur_freq * 1000ul;

	pr_info("Registering PowerMac CPU frequency driver\n");
	pr_info("Low: %d Mhz, High: %d Mhz, Boot: %d Mhz\n",
		low_freq/1000, hi_freq/1000, cur_freq/1000);

	return cpufreq_register_driver(&pmac_cpufreq_driver);
}

module_init(pmac_cpufreq_setup);

OpenPOWER on IntegriCloud