summaryrefslogtreecommitdiff
path: root/drivers/clk/samsung/clk-pll.c
blob: 077555416ce16f036764825f1580bf4ed78ffd7c (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
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
770
771
/*
 * Copyright (c) 2013 Samsung Electronics Co., Ltd.
 * Copyright (c) 2013 Linaro Ltd.
 *
 * 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.
 *
 * This file contains the utility functions to register the pll clocks.
*/

#include <linux/errno.h>
#include "clk.h"
#include "clk-pll.h"

struct samsung_clk_pll {
	struct clk_hw		hw;
	void __iomem		*lock_reg;
	void __iomem		*con_reg;
	enum samsung_pll_type	type;
	unsigned int		rate_count;
	const struct samsung_pll_rate_table *rate_table;
};

#define to_clk_pll(_hw) container_of(_hw, struct samsung_clk_pll, hw)

static const struct samsung_pll_rate_table *samsung_get_pll_settings(
				struct samsung_clk_pll *pll, unsigned long rate)
{
	const struct samsung_pll_rate_table  *rate_table = pll->rate_table;
	int i;

	for (i = 0; i < pll->rate_count; i++) {
		if (rate == rate_table[i].rate)
			return &rate_table[i];
	}

	return NULL;
}

static long samsung_pll_round_rate(struct clk_hw *hw,
			unsigned long drate, unsigned long *prate)
{
	struct samsung_clk_pll *pll = to_clk_pll(hw);
	const struct samsung_pll_rate_table *rate_table = pll->rate_table;
	int i;

	/* Assumming rate_table is in descending order */
	for (i = 0; i < pll->rate_count; i++) {
		if (drate >= rate_table[i].rate)
			return rate_table[i].rate;
	}

	/* return minimum supported value */
	return rate_table[i - 1].rate;
}

/*
 * PLL35xx Clock Type
 */
/* Maximum lock time can be 270 * PDIV cycles */
#define PLL35XX_LOCK_FACTOR	(270)

#define PLL35XX_MDIV_MASK       (0x3FF)
#define PLL35XX_PDIV_MASK       (0x3F)
#define PLL35XX_SDIV_MASK       (0x7)
#define PLL35XX_LOCK_STAT_MASK	(0x1)
#define PLL35XX_MDIV_SHIFT      (16)
#define PLL35XX_PDIV_SHIFT      (8)
#define PLL35XX_SDIV_SHIFT      (0)
#define PLL35XX_LOCK_STAT_SHIFT	(29)

static unsigned long samsung_pll35xx_recalc_rate(struct clk_hw *hw,
				unsigned long parent_rate)
{
	struct samsung_clk_pll *pll = to_clk_pll(hw);
	u32 mdiv, pdiv, sdiv, pll_con;
	u64 fvco = parent_rate;

	pll_con = __raw_readl(pll->con_reg);
	mdiv = (pll_con >> PLL35XX_MDIV_SHIFT) & PLL35XX_MDIV_MASK;
	pdiv = (pll_con >> PLL35XX_PDIV_SHIFT) & PLL35XX_PDIV_MASK;
	sdiv = (pll_con >> PLL35XX_SDIV_SHIFT) & PLL35XX_SDIV_MASK;

	fvco *= mdiv;
	do_div(fvco, (pdiv << sdiv));

	return (unsigned long)fvco;
}

static inline bool samsung_pll35xx_mp_change(
		const struct samsung_pll_rate_table *rate, u32 pll_con)
{
	u32 old_mdiv, old_pdiv;

	old_mdiv = (pll_con >> PLL35XX_MDIV_SHIFT) & PLL35XX_MDIV_MASK;
	old_pdiv = (pll_con >> PLL35XX_PDIV_SHIFT) & PLL35XX_PDIV_MASK;

	return (rate->mdiv != old_mdiv || rate->pdiv != old_pdiv);
}

static int samsung_pll35xx_set_rate(struct clk_hw *hw, unsigned long drate,
					unsigned long prate)
{
	struct samsung_clk_pll *pll = to_clk_pll(hw);
	const struct samsung_pll_rate_table *rate;
	u32 tmp;

	/* Get required rate settings from table */
	rate = samsung_get_pll_settings(pll, drate);
	if (!rate) {
		pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__,
			drate, __clk_get_name(hw->clk));
		return -EINVAL;
	}

	tmp = __raw_readl(pll->con_reg);

	if (!(samsung_pll35xx_mp_change(rate, tmp))) {
		/* If only s change, change just s value only*/
		tmp &= ~(PLL35XX_SDIV_MASK << PLL35XX_SDIV_SHIFT);
		tmp |= rate->sdiv << PLL35XX_SDIV_SHIFT;
		__raw_writel(tmp, pll->con_reg);

		return 0;
	}

	/* Set PLL lock time. */
	__raw_writel(rate->pdiv * PLL35XX_LOCK_FACTOR,
			pll->lock_reg);

	/* Change PLL PMS values */
	tmp &= ~((PLL35XX_MDIV_MASK << PLL35XX_MDIV_SHIFT) |
			(PLL35XX_PDIV_MASK << PLL35XX_PDIV_SHIFT) |
			(PLL35XX_SDIV_MASK << PLL35XX_SDIV_SHIFT));
	tmp |= (rate->mdiv << PLL35XX_MDIV_SHIFT) |
			(rate->pdiv << PLL35XX_PDIV_SHIFT) |
			(rate->sdiv << PLL35XX_SDIV_SHIFT);
	__raw_writel(tmp, pll->con_reg);

	/* wait_lock_time */
	do {
		cpu_relax();
		tmp = __raw_readl(pll->con_reg);
	} while (!(tmp & (PLL35XX_LOCK_STAT_MASK
				<< PLL35XX_LOCK_STAT_SHIFT)));
	return 0;
}

static const struct clk_ops samsung_pll35xx_clk_ops = {
	.recalc_rate = samsung_pll35xx_recalc_rate,
	.round_rate = samsung_pll_round_rate,
	.set_rate = samsung_pll35xx_set_rate,
};

static const struct clk_ops samsung_pll35xx_clk_min_ops = {
	.recalc_rate = samsung_pll35xx_recalc_rate,
};

/*
 * PLL36xx Clock Type
 */
/* Maximum lock time can be 3000 * PDIV cycles */
#define PLL36XX_LOCK_FACTOR    (3000)

#define PLL36XX_KDIV_MASK	(0xFFFF)
#define PLL36XX_MDIV_MASK	(0x1FF)
#define PLL36XX_PDIV_MASK	(0x3F)
#define PLL36XX_SDIV_MASK	(0x7)
#define PLL36XX_MDIV_SHIFT	(16)
#define PLL36XX_PDIV_SHIFT	(8)
#define PLL36XX_SDIV_SHIFT	(0)
#define PLL36XX_KDIV_SHIFT	(0)
#define PLL36XX_LOCK_STAT_SHIFT	(29)

static unsigned long samsung_pll36xx_recalc_rate(struct clk_hw *hw,
				unsigned long parent_rate)
{
	struct samsung_clk_pll *pll = to_clk_pll(hw);
	u32 mdiv, pdiv, sdiv, pll_con0, pll_con1;
	s16 kdiv;
	u64 fvco = parent_rate;

	pll_con0 = __raw_readl(pll->con_reg);
	pll_con1 = __raw_readl(pll->con_reg + 4);
	mdiv = (pll_con0 >> PLL36XX_MDIV_SHIFT) & PLL36XX_MDIV_MASK;
	pdiv = (pll_con0 >> PLL36XX_PDIV_SHIFT) & PLL36XX_PDIV_MASK;
	sdiv = (pll_con0 >> PLL36XX_SDIV_SHIFT) & PLL36XX_SDIV_MASK;
	kdiv = (s16)(pll_con1 & PLL36XX_KDIV_MASK);

	fvco *= (mdiv << 16) + kdiv;
	do_div(fvco, (pdiv << sdiv));
	fvco >>= 16;

	return (unsigned long)fvco;
}

static inline bool samsung_pll36xx_mpk_change(
	const struct samsung_pll_rate_table *rate, u32 pll_con0, u32 pll_con1)
{
	u32 old_mdiv, old_pdiv, old_kdiv;

	old_mdiv = (pll_con0 >> PLL36XX_MDIV_SHIFT) & PLL36XX_MDIV_MASK;
	old_pdiv = (pll_con0 >> PLL36XX_PDIV_SHIFT) & PLL36XX_PDIV_MASK;
	old_kdiv = (pll_con1 >> PLL36XX_KDIV_SHIFT) & PLL36XX_KDIV_MASK;

	return (rate->mdiv != old_mdiv || rate->pdiv != old_pdiv ||
		rate->kdiv != old_kdiv);
}

static int samsung_pll36xx_set_rate(struct clk_hw *hw, unsigned long drate,
					unsigned long parent_rate)
{
	struct samsung_clk_pll *pll = to_clk_pll(hw);
	u32 tmp, pll_con0, pll_con1;
	const struct samsung_pll_rate_table *rate;

	rate = samsung_get_pll_settings(pll, drate);
	if (!rate) {
		pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__,
			drate, __clk_get_name(hw->clk));
		return -EINVAL;
	}

	pll_con0 = __raw_readl(pll->con_reg);
	pll_con1 = __raw_readl(pll->con_reg + 4);

	if (!(samsung_pll36xx_mpk_change(rate, pll_con0, pll_con1))) {
		/* If only s change, change just s value only*/
		pll_con0 &= ~(PLL36XX_SDIV_MASK << PLL36XX_SDIV_SHIFT);
		pll_con0 |= (rate->sdiv << PLL36XX_SDIV_SHIFT);
		__raw_writel(pll_con0, pll->con_reg);

		return 0;
	}

	/* Set PLL lock time. */
	__raw_writel(rate->pdiv * PLL36XX_LOCK_FACTOR, pll->lock_reg);

	 /* Change PLL PMS values */
	pll_con0 &= ~((PLL36XX_MDIV_MASK << PLL36XX_MDIV_SHIFT) |
			(PLL36XX_PDIV_MASK << PLL36XX_PDIV_SHIFT) |
			(PLL36XX_SDIV_MASK << PLL36XX_SDIV_SHIFT));
	pll_con0 |= (rate->mdiv << PLL36XX_MDIV_SHIFT) |
			(rate->pdiv << PLL36XX_PDIV_SHIFT) |
			(rate->sdiv << PLL36XX_SDIV_SHIFT);
	__raw_writel(pll_con0, pll->con_reg);

	pll_con1 &= ~(PLL36XX_KDIV_MASK << PLL36XX_KDIV_SHIFT);
	pll_con1 |= rate->kdiv << PLL36XX_KDIV_SHIFT;
	__raw_writel(pll_con1, pll->con_reg + 4);

	/* wait_lock_time */
	do {
		cpu_relax();
		tmp = __raw_readl(pll->con_reg);
	} while (!(tmp & (1 << PLL36XX_LOCK_STAT_SHIFT)));

	return 0;
}

static const struct clk_ops samsung_pll36xx_clk_ops = {
	.recalc_rate = samsung_pll36xx_recalc_rate,
	.set_rate = samsung_pll36xx_set_rate,
	.round_rate = samsung_pll_round_rate,
};

static const struct clk_ops samsung_pll36xx_clk_min_ops = {
	.recalc_rate = samsung_pll36xx_recalc_rate,
};

/*
 * PLL45xx Clock Type
 */

#define PLL45XX_MDIV_MASK	(0x3FF)
#define PLL45XX_PDIV_MASK	(0x3F)
#define PLL45XX_SDIV_MASK	(0x7)
#define PLL45XX_MDIV_SHIFT	(16)
#define PLL45XX_PDIV_SHIFT	(8)
#define PLL45XX_SDIV_SHIFT	(0)

struct samsung_clk_pll45xx {
	struct clk_hw		hw;
	enum pll45xx_type	type;
	const void __iomem	*con_reg;
};

#define to_clk_pll45xx(_hw) container_of(_hw, struct samsung_clk_pll45xx, hw)

static unsigned long samsung_pll45xx_recalc_rate(struct clk_hw *hw,
				unsigned long parent_rate)
{
	struct samsung_clk_pll45xx *pll = to_clk_pll45xx(hw);
	u32 mdiv, pdiv, sdiv, pll_con;
	u64 fvco = parent_rate;

	pll_con = __raw_readl(pll->con_reg);
	mdiv = (pll_con >> PLL45XX_MDIV_SHIFT) & PLL45XX_MDIV_MASK;
	pdiv = (pll_con >> PLL45XX_PDIV_SHIFT) & PLL45XX_PDIV_MASK;
	sdiv = (pll_con >> PLL45XX_SDIV_SHIFT) & PLL45XX_SDIV_MASK;

	if (pll->type == pll_4508)
		sdiv = sdiv - 1;

	fvco *= mdiv;
	do_div(fvco, (pdiv << sdiv));

	return (unsigned long)fvco;
}

static const struct clk_ops samsung_pll45xx_clk_ops = {
	.recalc_rate = samsung_pll45xx_recalc_rate,
};

struct clk * __init samsung_clk_register_pll45xx(const char *name,
			const char *pname, const void __iomem *con_reg,
			enum pll45xx_type type)
{
	struct samsung_clk_pll45xx *pll;
	struct clk *clk;
	struct clk_init_data init;

	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
	if (!pll) {
		pr_err("%s: could not allocate pll clk %s\n", __func__, name);
		return NULL;
	}

	init.name = name;
	init.ops = &samsung_pll45xx_clk_ops;
	init.flags = CLK_GET_RATE_NOCACHE;
	init.parent_names = &pname;
	init.num_parents = 1;

	pll->hw.init = &init;
	pll->con_reg = con_reg;
	pll->type = type;

	clk = clk_register(NULL, &pll->hw);
	if (IS_ERR(clk)) {
		pr_err("%s: failed to register pll clock %s\n", __func__,
				name);
		kfree(pll);
	}

	if (clk_register_clkdev(clk, name, NULL))
		pr_err("%s: failed to register lookup for %s", __func__, name);

	return clk;
}

/*
 * PLL46xx Clock Type
 */

#define PLL46XX_MDIV_MASK	(0x1FF)
#define PLL46XX_PDIV_MASK	(0x3F)
#define PLL46XX_SDIV_MASK	(0x7)
#define PLL46XX_MDIV_SHIFT	(16)
#define PLL46XX_PDIV_SHIFT	(8)
#define PLL46XX_SDIV_SHIFT	(0)

#define PLL46XX_KDIV_MASK	(0xFFFF)
#define PLL4650C_KDIV_MASK	(0xFFF)
#define PLL46XX_KDIV_SHIFT	(0)

struct samsung_clk_pll46xx {
	struct clk_hw		hw;
	enum pll46xx_type	type;
	const void __iomem	*con_reg;
};

#define to_clk_pll46xx(_hw) container_of(_hw, struct samsung_clk_pll46xx, hw)

static unsigned long samsung_pll46xx_recalc_rate(struct clk_hw *hw,
				unsigned long parent_rate)
{
	struct samsung_clk_pll46xx *pll = to_clk_pll46xx(hw);
	u32 mdiv, pdiv, sdiv, kdiv, pll_con0, pll_con1, shift;
	u64 fvco = parent_rate;

	pll_con0 = __raw_readl(pll->con_reg);
	pll_con1 = __raw_readl(pll->con_reg + 4);
	mdiv = (pll_con0 >> PLL46XX_MDIV_SHIFT) & PLL46XX_MDIV_MASK;
	pdiv = (pll_con0 >> PLL46XX_PDIV_SHIFT) & PLL46XX_PDIV_MASK;
	sdiv = (pll_con0 >> PLL46XX_SDIV_SHIFT) & PLL46XX_SDIV_MASK;
	kdiv = pll->type == pll_4650c ? pll_con1 & PLL4650C_KDIV_MASK :
					pll_con1 & PLL46XX_KDIV_MASK;

	shift = pll->type == pll_4600 ? 16 : 10;
	fvco *= (mdiv << shift) + kdiv;
	do_div(fvco, (pdiv << sdiv));
	fvco >>= shift;

	return (unsigned long)fvco;
}

static const struct clk_ops samsung_pll46xx_clk_ops = {
	.recalc_rate = samsung_pll46xx_recalc_rate,
};

struct clk * __init samsung_clk_register_pll46xx(const char *name,
			const char *pname, const void __iomem *con_reg,
			enum pll46xx_type type)
{
	struct samsung_clk_pll46xx *pll;
	struct clk *clk;
	struct clk_init_data init;

	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
	if (!pll) {
		pr_err("%s: could not allocate pll clk %s\n", __func__, name);
		return NULL;
	}

	init.name = name;
	init.ops = &samsung_pll46xx_clk_ops;
	init.flags = CLK_GET_RATE_NOCACHE;
	init.parent_names = &pname;
	init.num_parents = 1;

	pll->hw.init = &init;
	pll->con_reg = con_reg;
	pll->type = type;

	clk = clk_register(NULL, &pll->hw);
	if (IS_ERR(clk)) {
		pr_err("%s: failed to register pll clock %s\n", __func__,
				name);
		kfree(pll);
	}

	if (clk_register_clkdev(clk, name, NULL))
		pr_err("%s: failed to register lookup for %s", __func__, name);

	return clk;
}

/*
 * PLL6552 Clock Type
 */

#define PLL6552_LOCK_REG	0x00
#define PLL6552_CON_REG		0x0c

#define PLL6552_MDIV_MASK	0x3ff
#define PLL6552_PDIV_MASK	0x3f
#define PLL6552_SDIV_MASK	0x7
#define PLL6552_MDIV_SHIFT	16
#define PLL6552_PDIV_SHIFT	8
#define PLL6552_SDIV_SHIFT	0

struct samsung_clk_pll6552 {
	struct clk_hw hw;
	void __iomem *reg_base;
};

#define to_clk_pll6552(_hw) container_of(_hw, struct samsung_clk_pll6552, hw)

static unsigned long samsung_pll6552_recalc_rate(struct clk_hw *hw,
						unsigned long parent_rate)
{
	struct samsung_clk_pll6552 *pll = to_clk_pll6552(hw);
	u32 mdiv, pdiv, sdiv, pll_con;
	u64 fvco = parent_rate;

	pll_con = __raw_readl(pll->reg_base + PLL6552_CON_REG);
	mdiv = (pll_con >> PLL6552_MDIV_SHIFT) & PLL6552_MDIV_MASK;
	pdiv = (pll_con >> PLL6552_PDIV_SHIFT) & PLL6552_PDIV_MASK;
	sdiv = (pll_con >> PLL6552_SDIV_SHIFT) & PLL6552_SDIV_MASK;

	fvco *= mdiv;
	do_div(fvco, (pdiv << sdiv));

	return (unsigned long)fvco;
}

static const struct clk_ops samsung_pll6552_clk_ops = {
	.recalc_rate = samsung_pll6552_recalc_rate,
};

struct clk * __init samsung_clk_register_pll6552(const char *name,
					const char *pname, void __iomem *base)
{
	struct samsung_clk_pll6552 *pll;
	struct clk *clk;
	struct clk_init_data init;

	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
	if (!pll) {
		pr_err("%s: could not allocate pll clk %s\n", __func__, name);
		return NULL;
	}

	init.name = name;
	init.ops = &samsung_pll6552_clk_ops;
	init.parent_names = &pname;
	init.num_parents = 1;

	pll->hw.init = &init;
	pll->reg_base = base;

	clk = clk_register(NULL, &pll->hw);
	if (IS_ERR(clk)) {
		pr_err("%s: failed to register pll clock %s\n", __func__,
				name);
		kfree(pll);
	}

	if (clk_register_clkdev(clk, name, NULL))
		pr_err("%s: failed to register lookup for %s", __func__, name);

	return clk;
}

/*
 * PLL6553 Clock Type
 */

#define PLL6553_LOCK_REG	0x00
#define PLL6553_CON0_REG	0x0c
#define PLL6553_CON1_REG	0x10

#define PLL6553_MDIV_MASK	0xff
#define PLL6553_PDIV_MASK	0x3f
#define PLL6553_SDIV_MASK	0x7
#define PLL6553_KDIV_MASK	0xffff
#define PLL6553_MDIV_SHIFT	16
#define PLL6553_PDIV_SHIFT	8
#define PLL6553_SDIV_SHIFT	0
#define PLL6553_KDIV_SHIFT	0

struct samsung_clk_pll6553 {
	struct clk_hw hw;
	void __iomem *reg_base;
};

#define to_clk_pll6553(_hw) container_of(_hw, struct samsung_clk_pll6553, hw)

static unsigned long samsung_pll6553_recalc_rate(struct clk_hw *hw,
						unsigned long parent_rate)
{
	struct samsung_clk_pll6553 *pll = to_clk_pll6553(hw);
	u32 mdiv, pdiv, sdiv, kdiv, pll_con0, pll_con1;
	u64 fvco = parent_rate;

	pll_con0 = __raw_readl(pll->reg_base + PLL6553_CON0_REG);
	pll_con1 = __raw_readl(pll->reg_base + PLL6553_CON1_REG);
	mdiv = (pll_con0 >> PLL6553_MDIV_SHIFT) & PLL6553_MDIV_MASK;
	pdiv = (pll_con0 >> PLL6553_PDIV_SHIFT) & PLL6553_PDIV_MASK;
	sdiv = (pll_con0 >> PLL6553_SDIV_SHIFT) & PLL6553_SDIV_MASK;
	kdiv = (pll_con1 >> PLL6553_KDIV_SHIFT) & PLL6553_KDIV_MASK;

	fvco *= (mdiv << 16) + kdiv;
	do_div(fvco, (pdiv << sdiv));
	fvco >>= 16;

	return (unsigned long)fvco;
}

static const struct clk_ops samsung_pll6553_clk_ops = {
	.recalc_rate = samsung_pll6553_recalc_rate,
};

struct clk * __init samsung_clk_register_pll6553(const char *name,
					const char *pname, void __iomem *base)
{
	struct samsung_clk_pll6553 *pll;
	struct clk *clk;
	struct clk_init_data init;

	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
	if (!pll) {
		pr_err("%s: could not allocate pll clk %s\n", __func__, name);
		return NULL;
	}

	init.name = name;
	init.ops = &samsung_pll6553_clk_ops;
	init.parent_names = &pname;
	init.num_parents = 1;

	pll->hw.init = &init;
	pll->reg_base = base;

	clk = clk_register(NULL, &pll->hw);
	if (IS_ERR(clk)) {
		pr_err("%s: failed to register pll clock %s\n", __func__,
				name);
		kfree(pll);
	}

	if (clk_register_clkdev(clk, name, NULL))
		pr_err("%s: failed to register lookup for %s", __func__, name);

	return clk;
}

/*
 * PLL2550x Clock Type
 */

#define PLL2550X_R_MASK       (0x1)
#define PLL2550X_P_MASK       (0x3F)
#define PLL2550X_M_MASK       (0x3FF)
#define PLL2550X_S_MASK       (0x7)
#define PLL2550X_R_SHIFT      (20)
#define PLL2550X_P_SHIFT      (14)
#define PLL2550X_M_SHIFT      (4)
#define PLL2550X_S_SHIFT      (0)

struct samsung_clk_pll2550x {
	struct clk_hw		hw;
	const void __iomem	*reg_base;
	unsigned long		offset;
};

#define to_clk_pll2550x(_hw) container_of(_hw, struct samsung_clk_pll2550x, hw)

static unsigned long samsung_pll2550x_recalc_rate(struct clk_hw *hw,
				unsigned long parent_rate)
{
	struct samsung_clk_pll2550x *pll = to_clk_pll2550x(hw);
	u32 r, p, m, s, pll_stat;
	u64 fvco = parent_rate;

	pll_stat = __raw_readl(pll->reg_base + pll->offset * 3);
	r = (pll_stat >> PLL2550X_R_SHIFT) & PLL2550X_R_MASK;
	if (!r)
		return 0;
	p = (pll_stat >> PLL2550X_P_SHIFT) & PLL2550X_P_MASK;
	m = (pll_stat >> PLL2550X_M_SHIFT) & PLL2550X_M_MASK;
	s = (pll_stat >> PLL2550X_S_SHIFT) & PLL2550X_S_MASK;

	fvco *= m;
	do_div(fvco, (p << s));

	return (unsigned long)fvco;
}

static const struct clk_ops samsung_pll2550x_clk_ops = {
	.recalc_rate = samsung_pll2550x_recalc_rate,
};

struct clk * __init samsung_clk_register_pll2550x(const char *name,
			const char *pname, const void __iomem *reg_base,
			const unsigned long offset)
{
	struct samsung_clk_pll2550x *pll;
	struct clk *clk;
	struct clk_init_data init;

	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
	if (!pll) {
		pr_err("%s: could not allocate pll clk %s\n", __func__, name);
		return NULL;
	}

	init.name = name;
	init.ops = &samsung_pll2550x_clk_ops;
	init.flags = CLK_GET_RATE_NOCACHE;
	init.parent_names = &pname;
	init.num_parents = 1;

	pll->hw.init = &init;
	pll->reg_base = reg_base;
	pll->offset = offset;

	clk = clk_register(NULL, &pll->hw);
	if (IS_ERR(clk)) {
		pr_err("%s: failed to register pll clock %s\n", __func__,
				name);
		kfree(pll);
	}

	if (clk_register_clkdev(clk, name, NULL))
		pr_err("%s: failed to register lookup for %s", __func__, name);

	return clk;
}

static void __init _samsung_clk_register_pll(struct samsung_pll_clock *pll_clk,
						void __iomem *base)
{
	struct samsung_clk_pll *pll;
	struct clk *clk;
	struct clk_init_data init;
	int ret, len;

	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
	if (!pll) {
		pr_err("%s: could not allocate pll clk %s\n",
			__func__, pll_clk->name);
		return;
	}

	init.name = pll_clk->name;
	init.flags = pll_clk->flags;
	init.parent_names = &pll_clk->parent_name;
	init.num_parents = 1;

	if (pll_clk->rate_table) {
		/* find count of rates in rate_table */
		for (len = 0; pll_clk->rate_table[len].rate != 0; )
			len++;

		pll->rate_count = len;
		pll->rate_table = kmemdup(pll_clk->rate_table,
					pll->rate_count *
					sizeof(struct samsung_pll_rate_table),
					GFP_KERNEL);
		WARN(!pll->rate_table,
			"%s: could not allocate rate table for %s\n",
			__func__, pll_clk->name);
	}

	switch (pll_clk->type) {
	/* clk_ops for 35xx and 2550 are similar */
	case pll_35xx:
	case pll_2550:
		if (!pll->rate_table)
			init.ops = &samsung_pll35xx_clk_min_ops;
		else
			init.ops = &samsung_pll35xx_clk_ops;
		break;
	/* clk_ops for 36xx and 2650 are similar */
	case pll_36xx:
	case pll_2650:
		if (!pll->rate_table)
			init.ops = &samsung_pll36xx_clk_min_ops;
		else
			init.ops = &samsung_pll36xx_clk_ops;
		break;
	default:
		pr_warn("%s: Unknown pll type for pll clk %s\n",
			__func__, pll_clk->name);
	}

	pll->hw.init = &init;
	pll->type = pll_clk->type;
	pll->lock_reg = base + pll_clk->lock_offset;
	pll->con_reg = base + pll_clk->con_offset;

	clk = clk_register(NULL, &pll->hw);
	if (IS_ERR(clk)) {
		pr_err("%s: failed to register pll clock %s : %ld\n",
			__func__, pll_clk->name, PTR_ERR(clk));
		kfree(pll);
		return;
	}

	samsung_clk_add_lookup(clk, pll_clk->id);

	if (!pll_clk->alias)
		return;

	ret = clk_register_clkdev(clk, pll_clk->alias, pll_clk->dev_name);
	if (ret)
		pr_err("%s: failed to register lookup for %s : %d",
			__func__, pll_clk->name, ret);
}

void __init samsung_clk_register_pll(struct samsung_pll_clock *pll_list,
				unsigned int nr_pll, void __iomem *base)
{
	int cnt;

	for (cnt = 0; cnt < nr_pll; cnt++)
		_samsung_clk_register_pll(&pll_list[cnt], base);
}