aboutsummaryrefslogblamecommitdiffstats
path: root/arch/arm/mach-pnx4008/clock.c
blob: f582ed2ec43c615cbbc10c8812b3b423ef7f2096 (plain) (tree)
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
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
































































































































































































































































































































































































































































































































































































































































































































































































                                                                                                                             















































                                                                     















































































                                                                              




                               
                                 








                                 



                             
                           




















































                                                                              
                                











                                                  
/*
 * arch/arm/mach-pnx4008/clock.c
 *
 * Clock control driver for PNX4008
 *
 * Authors: Vitaly Wool, Dmitry Chigirev <source@mvista.com>
 * Generic clock management functions are partially based on:
 *  linux/arch/arm/mach-omap/clock.c
 *
 * 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
 * the terms of the GNU General Public License version 2. This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/delay.h>

#include <asm/semaphore.h>
#include <asm/hardware.h>
#include <asm/io.h>

#include <asm/arch/clock.h>
#include "clock.h"

/*forward declaration*/
static struct clk per_ck;
static struct clk hclk_ck;
static struct clk ck_1MHz;
static struct clk ck_13MHz;
static struct clk ck_pll1;
static int local_set_rate(struct clk *clk, u32 rate);

static inline void clock_lock(void)
{
	local_irq_disable();
}

static inline void clock_unlock(void)
{
	local_irq_enable();
}

static void propagate_rate(struct clk *clk)
{
	struct clk *tmp_clk;

	tmp_clk = clk;
	while (tmp_clk->propagate_next) {
		tmp_clk = tmp_clk->propagate_next;
		local_set_rate(tmp_clk, tmp_clk->user_rate);
	}
}

static inline void clk_reg_disable(struct clk *clk)
{
	if (clk->enable_reg)
		__raw_writel(__raw_readl(clk->enable_reg) &
			     ~(1 << clk->enable_shift), clk->enable_reg);
}

static inline void clk_reg_enable(struct clk *clk)
{
	if (clk->enable_reg)
		__raw_writel(__raw_readl(clk->enable_reg) |
			     (1 << clk->enable_shift), clk->enable_reg);
}

static inline void clk_reg_disable1(struct clk *clk)
{
	if (clk->enable_reg1)
		__raw_writel(__raw_readl(clk->enable_reg1) &
			     ~(1 << clk->enable_shift1), clk->enable_reg1);
}

static inline void clk_reg_enable1(struct clk *clk)
{
	if (clk->enable_reg1)
		__raw_writel(__raw_readl(clk->enable_reg1) |
			     (1 << clk->enable_shift1), clk->enable_reg1);
}

static int clk_wait_for_pll_lock(struct clk *clk)
{
	int i;
	i = 0;
	while (i++ < 0xFFF && !(__raw_readl(clk->scale_reg) & 1)) ;	/*wait for PLL to lock */

	if (!(__raw_readl(clk->scale_reg) & 1)) {
		printk(KERN_ERR
		       "%s ERROR: failed to lock, scale reg data: %x\n",
		       clk->name, __raw_readl(clk->scale_reg));
		return -1;
	}
	return 0;
}

static int switch_to_dirty_13mhz(struct clk *clk)
{
	int i;
	int ret;
	u32 tmp_reg;

	ret = 0;

	if (!clk->rate)
		clk_reg_enable1(clk);

	tmp_reg = __raw_readl(clk->parent_switch_reg);
	/*if 13Mhz clock selected, select 13'MHz (dirty) source from OSC */
	if (!(tmp_reg & 1)) {
		tmp_reg |= (1 << 1);	/* Trigger switch to 13'MHz (dirty) clock */
		__raw_writel(tmp_reg, clk->parent_switch_reg);
		i = 0;
		while (i++ < 0xFFF && !(__raw_readl(clk->parent_switch_reg) & 1)) ;	/*wait for 13'MHz selection status */

		if (!(__raw_readl(clk->parent_switch_reg) & 1)) {
			printk(KERN_ERR
			       "%s ERROR: failed to select 13'MHz, parent sw reg data: %x\n",
			       clk->name, __raw_readl(clk->parent_switch_reg));
			ret = -1;
		}
	}

	if (!clk->rate)
		clk_reg_disable1(clk);

	return ret;
}

static int switch_to_clean_13mhz(struct clk *clk)
{
	int i;
	int ret;
	u32 tmp_reg;

	ret = 0;

	if (!clk->rate)
		clk_reg_enable1(clk);

	tmp_reg = __raw_readl(clk->parent_switch_reg);
	/*if 13'Mhz clock selected, select 13MHz (clean) source from OSC */
	if (tmp_reg & 1) {
		tmp_reg &= ~(1 << 1);	/* Trigger switch to 13MHz (clean) clock */
		__raw_writel(tmp_reg, clk->parent_switch_reg);
		i = 0;
		while (i++ < 0xFFF && (__raw_readl(clk->parent_switch_reg) & 1)) ;	/*wait for 13MHz selection status */

		if (__raw_readl(clk->parent_switch_reg) & 1) {
			printk(KERN_ERR
			       "%s ERROR: failed to select 13MHz, parent sw reg data: %x\n",
			       clk->name, __raw_readl(clk->parent_switch_reg));
			ret = -1;
		}
	}

	if (!clk->rate)
		clk_reg_disable1(clk);

	return ret;
}

static int set_13MHz_parent(struct clk *clk, struct clk *parent)
{
	int ret = -EINVAL;

	if (parent == &ck_13MHz)
		ret = switch_to_clean_13mhz(clk);
	else if (parent == &ck_pll1)
		ret = switch_to_dirty_13mhz(clk);

	return ret;
}

#define PLL160_MIN_FCCO 156000
#define PLL160_MAX_FCCO 320000

/*
 * Calculate pll160 settings.
 * Possible input: up to 320MHz with step of clk->parent->rate.
 * In PNX4008 parent rate for pll160s may be either 1 or 13MHz.
 * Ignored paths: "feedback" (bit 13 set), "div-by-N".
 * Setting ARM PLL4 rate to 0 will put CPU into direct run mode.
 * Setting PLL5 and PLL3 rate to 0 will disable USB and DSP clock input.
 * Please refer to PNX4008 IC manual for details.
 */

static int pll160_set_rate(struct clk *clk, u32 rate)
{
	u32 tmp_reg, tmp_m, tmp_2p, i;
	u32 parent_rate;
	int ret = -EINVAL;

	parent_rate = clk->parent->rate;

	if (!parent_rate)
		goto out;

	/* set direct run for ARM or disable output for others  */
	clk_reg_disable(clk);

	/* disable source input as well (ignored for ARM) */
	clk_reg_disable1(clk);

	tmp_reg = __raw_readl(clk->scale_reg);
	tmp_reg &= ~0x1ffff;	/*clear all settings, power down */
	__raw_writel(tmp_reg, clk->scale_reg);

	rate -= rate % parent_rate;	/*round down the input */

	if (rate > PLL160_MAX_FCCO)
		rate = PLL160_MAX_FCCO;

	if (!rate) {
		clk->rate = 0;
		ret = 0;
		goto out;
	}

	clk_reg_enable1(clk);
	tmp_reg = __raw_readl(clk->scale_reg);

	if (rate == parent_rate) {
		/*enter direct bypass mode */
		tmp_reg |= ((1 << 14) | (1 << 15));
		__raw_writel(tmp_reg, clk->scale_reg);
		clk->rate = parent_rate;
		clk_reg_enable(clk);
		ret = 0;
		goto out;
	}

	i = 0;
	for (tmp_2p = 1; tmp_2p < 16; tmp_2p <<= 1) {
		if (rate * tmp_2p >= PLL160_MIN_FCCO)
			break;
		i++;
	}

	if (tmp_2p > 1)
		tmp_reg |= ((i - 1) << 11);
	else
		tmp_reg |= (1 << 14);	/*direct mode, no divide */

	tmp_m = rate * tmp_2p;
	tmp_m /= parent_rate;

	tmp_reg |= (tmp_m - 1) << 1;	/*calculate M */
	tmp_reg |= (1 << 16);	/*power up PLL */
	__raw_writel(tmp_reg, clk->scale_reg);

	if (clk_wait_for_pll_lock(clk) < 0) {
		clk_reg_disable(clk);
		clk_reg_disable1(clk);

		tmp_reg = __raw_readl(clk->scale_reg);
		tmp_reg &= ~0x1ffff;	/*clear all settings, power down */
		__raw_writel(tmp_reg, clk->scale_reg);
		clk->rate = 0;
		ret = -EFAULT;
		goto out;
	}

	clk->rate = (tmp_m * parent_rate) / tmp_2p;

	if (clk->flags & RATE_PROPAGATES)
		propagate_rate(clk);

	clk_reg_enable(clk);
	ret = 0;

out:
	return ret;
}

/*configure PER_CLK*/
static int per_clk_set_rate(struct clk *clk, u32 rate)
{
	u32 tmp;

	tmp = __raw_readl(clk->scale_reg);
	tmp &= ~(0x1f << 2);
	tmp |= ((clk->parent->rate / clk->rate) - 1) << 2;
	__raw_writel(tmp, clk->scale_reg);
	clk->rate = rate;
	return 0;
}

/*configure HCLK*/
static int hclk_set_rate(struct clk *clk, u32 rate)
{
	u32 tmp;
	tmp = __raw_readl(clk->scale_reg);
	tmp = tmp & ~0x3;
	switch (rate) {
	case 1:
		break;
	case 2:
		tmp |= 1;
		break;
	case 4:
		tmp |= 2;
		break;
	}

	__raw_writel(tmp, clk->scale_reg);
	clk->rate = rate;
	return 0;
}

static u32 hclk_round_rate(struct clk *clk, u32 rate)
{
	switch (rate) {
	case 1:
	case 4:
		return rate;
	}
	return 2;
}

static u32 per_clk_round_rate(struct clk *clk, u32 rate)
{
	return CLK_RATE_13MHZ;
}

static int on_off_set_rate(struct clk *clk, u32 rate)
{
	if (rate) {
		clk_reg_enable(clk);
		clk->rate = 1;
	} else {
		clk_reg_disable(clk);
		clk->rate = 0;
	}
	return 0;
}

static int on_off_inv_set_rate(struct clk *clk, u32 rate)
{
	if (rate) {
		clk_reg_disable(clk);	/*enable bit is inverted */
		clk->rate = 1;
	} else {
		clk_reg_enable(clk);
		clk->rate = 0;
	}
	return 0;
}

static u32 on_off_round_rate(struct clk *clk, u32 rate)
{
	return (rate ? 1 : 0);
}

static u32 pll4_round_rate(struct clk *clk, u32 rate)
{
	if (rate > CLK_RATE_208MHZ)
		rate = CLK_RATE_208MHZ;
	if (rate == CLK_RATE_208MHZ && hclk_ck.user_rate == 1)
		rate = CLK_RATE_208MHZ - CLK_RATE_13MHZ;
	return (rate - (rate % (hclk_ck.user_rate * CLK_RATE_13MHZ)));
}

static u32 pll3_round_rate(struct clk *clk, u32 rate)
{
	if (rate > CLK_RATE_208MHZ)
		rate = CLK_RATE_208MHZ;
	return (rate - rate % CLK_RATE_13MHZ);
}

static u32 pll5_round_rate(struct clk *clk, u32 rate)
{
	return (rate ? CLK_RATE_48MHZ : 0);
}

static u32 ck_13MHz_round_rate(struct clk *clk, u32 rate)
{
	return (rate ? CLK_RATE_13MHZ : 0);
}

static int ck_13MHz_set_rate(struct clk *clk, u32 rate)
{
	if (rate) {
		clk_reg_disable(clk);	/*enable bit is inverted */
		udelay(500);
		clk->rate = CLK_RATE_13MHZ;
		ck_1MHz.rate = CLK_RATE_1MHZ;
	} else {
		clk_reg_enable(clk);
		clk->rate = 0;
		ck_1MHz.rate = 0;
	}
	return 0;
}

static int pll1_set_rate(struct clk *clk, u32 rate)
{
#if 0 /* doesn't work on some boards, probably a HW BUG */
	if (rate) {
		clk_reg_disable(clk);	/*enable bit is inverted */
		if (!clk_wait_for_pll_lock(clk)) {
			clk->rate = CLK_RATE_13MHZ;
		} else {
			clk_reg_enable(clk);
			clk->rate = 0;
		}

	} else {
		clk_reg_enable(clk);
		clk->rate = 0;
	}
#endif
	return 0;
}

/* Clock sources */

static struct clk osc_13MHz = {
	.name = "osc_13MHz",
	.flags = FIXED_RATE,
	.rate = CLK_RATE_13MHZ,
};

static struct clk ck_13MHz = {
	.name = "ck_13MHz",
	.parent = &osc_13MHz,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &ck_13MHz_round_rate,
	.set_rate = &ck_13MHz_set_rate,
	.enable_reg = OSC13CTRL_REG,
	.enable_shift = 0,
	.rate = CLK_RATE_13MHZ,
};

static struct clk osc_32KHz = {
	.name = "osc_32KHz",
	.flags = FIXED_RATE,
	.rate = CLK_RATE_32KHZ,
};

/*attached to PLL5*/
static struct clk ck_1MHz = {
	.name = "ck_1MHz",
	.flags = FIXED_RATE | PARENT_SET_RATE,
	.parent = &ck_13MHz,
};

/* PLL1 (397) - provides 13' MHz clock */
static struct clk ck_pll1 = {
	.name = "ck_pll1",
	.parent = &osc_32KHz,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &ck_13MHz_round_rate,
	.set_rate = &pll1_set_rate,
	.enable_reg = PLLCTRL_REG,
	.enable_shift = 1,
	.scale_reg = PLLCTRL_REG,
	.rate = CLK_RATE_13MHZ,
};

/* CPU/Bus PLL */
static struct clk ck_pll4 = {
	.name = "ck_pll4",
	.parent = &ck_pll1,
	.flags = RATE_PROPAGATES | NEEDS_INITIALIZATION,
	.propagate_next = &per_ck,
	.round_rate = &pll4_round_rate,
	.set_rate = &pll160_set_rate,
	.rate = CLK_RATE_208MHZ,
	.scale_reg = HCLKPLLCTRL_REG,
	.enable_reg = PWRCTRL_REG,
	.enable_shift = 2,
	.parent_switch_reg = SYSCLKCTRL_REG,
	.set_parent = &set_13MHz_parent,
};

/* USB PLL */
static struct clk ck_pll5 = {
	.name = "ck_pll5",
	.parent = &ck_1MHz,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &pll5_round_rate,
	.set_rate = &pll160_set_rate,
	.scale_reg = USBCTRL_REG,
	.enable_reg = USBCTRL_REG,
	.enable_shift = 18,
	.enable_reg1 = USBCTRL_REG,
	.enable_shift1 = 17,
};

/* XPERTTeak DSP PLL */
static struct clk ck_pll3 = {
	.name = "ck_pll3",
	.parent = &ck_pll1,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &pll3_round_rate,
	.set_rate = &pll160_set_rate,
	.scale_reg = DSPPLLCTRL_REG,
	.enable_reg = DSPCLKCTRL_REG,
	.enable_shift = 3,
	.enable_reg1 = DSPCLKCTRL_REG,
	.enable_shift1 = 2,
	.parent_switch_reg = DSPCLKCTRL_REG,
	.set_parent = &set_13MHz_parent,
};

static struct clk hclk_ck = {
	.name = "hclk_ck",
	.parent = &ck_pll4,
	.flags = PARENT_SET_RATE,
	.set_rate = &hclk_set_rate,
	.round_rate = &hclk_round_rate,
	.scale_reg = HCLKDIVCTRL_REG,
	.rate = 2,
	.user_rate = 2,
};

static struct clk per_ck = {
	.name = "per_ck",
	.parent = &ck_pll4,
	.flags = FIXED_RATE,
	.propagate_next = &hclk_ck,
	.set_rate = &per_clk_set_rate,
	.round_rate = &per_clk_round_rate,
	.scale_reg = HCLKDIVCTRL_REG,
	.rate = CLK_RATE_13MHZ,
	.user_rate = CLK_RATE_13MHZ,
};

static struct clk m2hclk_ck = {
	.name = "m2hclk_ck",
	.parent = &hclk_ck,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_inv_set_rate,
	.rate = 1,
	.enable_shift = 6,
	.enable_reg = PWRCTRL_REG,
};

static struct clk vfp9_ck = {
	.name = "vfp9_ck",
	.parent = &ck_pll4,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.rate = 1,
	.enable_shift = 4,
	.enable_reg = VFP9CLKCTRL_REG,
};

static struct clk keyscan_ck = {
	.name = "keyscan_ck",
	.parent = &osc_32KHz,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 0,
	.enable_reg = KEYCLKCTRL_REG,
};

static struct clk touch_ck = {
	.name = "touch_ck",
	.parent = &osc_32KHz,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 0,
	.enable_reg = TSCLKCTRL_REG,
};

static struct clk pwm1_ck = {
	.name = "pwm1_ck",
	.parent = &osc_32KHz,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 0,
	.enable_reg = PWMCLKCTRL_REG,
};

static struct clk pwm2_ck = {
	.name = "pwm2_ck",
	.parent = &osc_32KHz,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 2,
	.enable_reg = PWMCLKCTRL_REG,
};

static struct clk jpeg_ck = {
	.name = "jpeg_ck",
	.parent = &hclk_ck,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 0,
	.enable_reg = JPEGCLKCTRL_REG,
};

static struct clk ms_ck = {
	.name = "ms_ck",
	.parent = &ck_pll4,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 5,
	.enable_reg = MSCTRL_REG,
};

static struct clk dum_ck = {
	.name = "dum_ck",
	.parent = &hclk_ck,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 0,
	.enable_reg = DUMCLKCTRL_REG,
};

static struct clk flash_ck = {
	.name = "flash_ck",
	.parent = &hclk_ck,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 1,	/* Only MLC clock supported */
	.enable_reg = FLASHCLKCTRL_REG,
};

static struct clk i2c0_ck = {
	.name = "i2c0_ck",
	.parent = &per_ck,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 0,
	.enable_reg = I2CCLKCTRL_REG,
};

static struct clk i2c1_ck = {
	.name = "i2c1_ck",
	.parent = &per_ck,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 1,
	.enable_reg = I2CCLKCTRL_REG,
};

static struct clk i2c2_ck = {
	.name = "i2c2_ck",
	.parent = &per_ck,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 2,
	.enable_reg = USB_OTG_CLKCTRL_REG,
};

static struct clk spi0_ck = {
	.name = "spi0_ck",
	.parent = &hclk_ck,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 0,
	.enable_reg = SPICTRL_REG,
};

static struct clk spi1_ck = {
	.name = "spi1_ck",
	.parent = &hclk_ck,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 4,
	.enable_reg = SPICTRL_REG,
};

static struct clk dma_ck = {
	.name = "dma_ck",
	.parent = &hclk_ck,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 0,
	.enable_reg = DMACLKCTRL_REG,
};

static struct clk uart3_ck = {
	.name = "uart3_ck",
	.parent = &per_ck,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.rate = 1,
	.enable_shift = 0,
	.enable_reg = UARTCLKCTRL_REG,
};

static struct clk uart4_ck = {
	.name = "uart4_ck",
	.parent = &per_ck,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 1,
	.enable_reg = UARTCLKCTRL_REG,
};

static struct clk uart5_ck = {
	.name = "uart5_ck",
	.parent = &per_ck,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.rate = 1,
	.enable_shift = 2,
	.enable_reg = UARTCLKCTRL_REG,
};

static struct clk uart6_ck = {
	.name = "uart6_ck",
	.parent = &per_ck,
	.flags = NEEDS_INITIALIZATION,
	.round_rate = &on_off_round_rate,
	.set_rate = &on_off_set_rate,
	.enable_shift = 3,
	.enable_reg = UARTCLKCTRL_REG,
};

/* These clocks are visible outside this module
 * and can be initialized
 */
static struct clk *onchip_clks[] = {
	&ck_13MHz,
	&ck_pll1,
	&ck_pll4,
	&ck_pll5,
	&ck_pll3,
	&vfp9_ck,
	&m2hclk_ck,
	&hclk_ck,
	&dma_ck,
	&flash_ck,
	&dum_ck,
	&keyscan_ck,
	&pwm1_ck,
	&pwm2_ck,
	&jpeg_ck,
	&ms_ck,
	&touch_ck,
	&i2c0_ck,
	&i2c1_ck,
	&i2c2_ck,
	&spi0_ck,
	&spi1_ck,
	&uart3_ck,
	&uart4_ck,
	&uart5_ck,
	&uart6_ck,
};

static int local_clk_enable(struct clk *clk)
{
	int ret = 0;

	if (!(clk->flags & FIXED_RATE) && !clk->rate && clk->set_rate
	    && clk->user_rate)
		ret = clk->set_rate(clk, clk->user_rate);
	return ret;
}

static void local_clk_disable(struct clk *clk)
{
	if (!(clk->flags & FIXED_RATE) && clk->rate && clk->set_rate)
		clk->set_rate(clk, 0);
}

static void local_clk_unuse(struct clk *clk)
{
	if (clk->usecount > 0 && !(--clk->usecount)) {
		local_clk_disable(clk);
		if (clk->parent)
			local_clk_unuse(clk->parent);
	}
}

static int local_clk_use(struct clk *clk)
{
	int ret = 0;
	if (clk->usecount++ == 0) {
		if (clk->parent)
			ret = local_clk_use(clk->parent);

		if (ret != 0) {
			clk->usecount--;
			goto out;
		}

		ret = local_clk_enable(clk);

		if (ret != 0 && clk->parent) {
			local_clk_unuse(clk->parent);
			clk->usecount--;
		}
	}
out:
	return ret;
}

static int local_set_rate(struct clk *clk, u32 rate)
{
	int ret = -EINVAL;
	if (clk->set_rate) {

		if (clk->user_rate == clk->rate && clk->parent->rate) {
			/* if clock enabled or rate not set */
			clk->user_rate = clk->round_rate(clk, rate);
			ret = clk->set_rate(clk, clk->user_rate);
		} else
			clk->user_rate = clk->round_rate(clk, rate);
		ret = 0;
	}
	return ret;
}

int clk_set_rate(struct clk *clk, unsigned long rate)
{
	int ret = -EINVAL;

	if (clk->flags & FIXED_RATE)
		goto out;

	clock_lock();
	if ((clk->flags & PARENT_SET_RATE) && clk->parent) {

		clk->user_rate = clk->round_rate(clk, rate);
		/* parent clock needs to be refreshed
		   for the setting to take effect */
	} else {
		ret = local_set_rate(clk, rate);
	}
	ret = 0;
	clock_unlock();

out:
	return ret;
}

EXPORT_SYMBOL(clk_set_rate);

struct clk *clk_get(struct device *dev, const char *id)
{
	struct clk *clk = ERR_PTR(-ENOENT);
	struct clk **clkp;

	clock_lock();
	for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
	     clkp++) {
		if (strcmp(id, (*clkp)->name) == 0
		    && try_module_get((*clkp)->owner)) {
			clk = (*clkp);
			break;
		}
	}
	clock_unlock();

	return clk;
}
EXPORT_SYMBOL(clk_get);

void clk_put(struct clk *clk)
{
	clock_lock();
	if (clk && !IS_ERR(clk))
		module_put(clk->owner);
	clock_unlock();
}
EXPORT_SYMBOL(clk_put);

unsigned long clk_get_rate(struct clk *clk)
{
	unsigned long ret;
	clock_lock();
	ret = clk->rate;
	clock_unlock();
	return ret;
}
EXPORT_SYMBOL(clk_get_rate);

int clk_enable(struct clk *clk)
{
	int ret = 0;

	clock_lock();
	ret = local_clk_use(clk);
	clock_unlock();
	return ret;
}

EXPORT_SYMBOL(clk_enable);

void clk_disable(struct clk *clk)
{
	clock_lock();
	local_clk_unuse(clk);
	clock_unlock();
}

EXPORT_SYMBOL(clk_disable);

long clk_round_rate(struct clk *clk, unsigned long rate)
{
	long ret;
	clock_lock();
	if (clk->round_rate)
		ret = clk->round_rate(clk, rate);
	else
		ret = clk->rate;
	clock_unlock();
	return ret;
}

EXPORT_SYMBOL(clk_round_rate);

int clk_set_parent(struct clk *clk, struct clk *parent)
{
	int ret = -ENODEV;
	if (!clk->set_parent)
		goto out;

	clock_lock();
	ret = clk->set_parent(clk, parent);
	if (!ret)
		clk->parent = parent;
	clock_unlock();

out:
	return ret;
}

EXPORT_SYMBOL(clk_set_parent);

static int __init clk_init(void)
{
	struct clk **clkp;

	/* Disable autoclocking, as it doesn't seem to work */
	__raw_writel(0xff, AUTOCLK_CTRL);

	for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
	     clkp++) {
		if (((*clkp)->flags & NEEDS_INITIALIZATION)
		    && ((*clkp)->set_rate)) {
			(*clkp)->user_rate = (*clkp)->rate;
			local_set_rate((*clkp), (*clkp)->user_rate);
			if ((*clkp)->set_parent)
				(*clkp)->set_parent((*clkp), (*clkp)->parent);
		}
		pr_debug("%s: clock %s, rate %ld\n",
			__FUNCTION__, (*clkp)->name, (*clkp)->rate);
	}

	local_clk_use(&ck_pll4);

	/* if ck_13MHz is not used, disable it. */
	if (ck_13MHz.usecount == 0)
		local_clk_disable(&ck_13MHz);

	/* Disable autoclocking */
	__raw_writeb(0xff, AUTOCLK_CTRL);

	return 0;
}

arch_initcall(clk_init);