Boot Linux faster!

Check our new training course

Boot Linux faster!

Check our new training course
and Creative Commons CC-BY-SA
lecture and lab materials

Bootlin logo

Elixir Cross Referencer

  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
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2014 MundoReader S.L.
 * Author: Heiko Stuebner <heiko@sntech.de>
 *
 * Copyright (c) 2015 Rockchip Electronics Co. Ltd.
 * Author: Xing Zheng <zhengxing@rock-chips.com>
 */

#include <asm/div64.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/clk-provider.h>
#include <linux/regmap.h>
#include <linux/clk.h>
#include "clk.h"

#define PLL_MODE_MASK		0x3
#define PLL_MODE_SLOW		0x0
#define PLL_MODE_NORM		0x1
#define PLL_MODE_DEEP		0x2
#define PLL_RK3328_MODE_MASK	0x1

struct rockchip_clk_pll {
	struct clk_hw		hw;

	struct clk_mux		pll_mux;
	const struct clk_ops	*pll_mux_ops;

	struct notifier_block	clk_nb;

	void __iomem		*reg_base;
	int			lock_offset;
	unsigned int		lock_shift;
	enum rockchip_pll_type	type;
	u8			flags;
	const struct rockchip_pll_rate_table *rate_table;
	unsigned int		rate_count;
	spinlock_t		*lock;

	struct rockchip_clk_provider *ctx;
};

#define to_rockchip_clk_pll(_hw) container_of(_hw, struct rockchip_clk_pll, hw)
#define to_rockchip_clk_pll_nb(nb) \
			container_of(nb, struct rockchip_clk_pll, clk_nb)

static const struct rockchip_pll_rate_table *rockchip_get_pll_settings(
			    struct rockchip_clk_pll *pll, unsigned long rate)
{
	const struct rockchip_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 rockchip_pll_round_rate(struct clk_hw *hw,
			    unsigned long drate, unsigned long *prate)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	const struct rockchip_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;
}

/*
 * Wait for the pll to reach the locked state.
 * The calling set_rate function is responsible for making sure the
 * grf regmap is available.
 */
static int rockchip_pll_wait_lock(struct rockchip_clk_pll *pll)
{
	struct regmap *grf = pll->ctx->grf;
	unsigned int val;
	int delay = 24000000, ret;

	while (delay > 0) {
		ret = regmap_read(grf, pll->lock_offset, &val);
		if (ret) {
			pr_err("%s: failed to read pll lock status: %d\n",
			       __func__, ret);
			return ret;
		}

		if (val & BIT(pll->lock_shift))
			return 0;
		delay--;
	}

	pr_err("%s: timeout waiting for pll to lock\n", __func__);
	return -ETIMEDOUT;
}

/**
 * PLL used in RK3036
 */

#define RK3036_PLLCON(i)			(i * 0x4)
#define RK3036_PLLCON0_FBDIV_MASK		0xfff
#define RK3036_PLLCON0_FBDIV_SHIFT		0
#define RK3036_PLLCON0_POSTDIV1_MASK		0x7
#define RK3036_PLLCON0_POSTDIV1_SHIFT		12
#define RK3036_PLLCON1_REFDIV_MASK		0x3f
#define RK3036_PLLCON1_REFDIV_SHIFT		0
#define RK3036_PLLCON1_POSTDIV2_MASK		0x7
#define RK3036_PLLCON1_POSTDIV2_SHIFT		6
#define RK3036_PLLCON1_DSMPD_MASK		0x1
#define RK3036_PLLCON1_DSMPD_SHIFT		12
#define RK3036_PLLCON2_FRAC_MASK		0xffffff
#define RK3036_PLLCON2_FRAC_SHIFT		0

#define RK3036_PLLCON1_PWRDOWN			(1 << 13)

static void rockchip_rk3036_pll_get_params(struct rockchip_clk_pll *pll,
					struct rockchip_pll_rate_table *rate)
{
	u32 pllcon;

	pllcon = readl_relaxed(pll->reg_base + RK3036_PLLCON(0));
	rate->fbdiv = ((pllcon >> RK3036_PLLCON0_FBDIV_SHIFT)
				& RK3036_PLLCON0_FBDIV_MASK);
	rate->postdiv1 = ((pllcon >> RK3036_PLLCON0_POSTDIV1_SHIFT)
				& RK3036_PLLCON0_POSTDIV1_MASK);

	pllcon = readl_relaxed(pll->reg_base + RK3036_PLLCON(1));
	rate->refdiv = ((pllcon >> RK3036_PLLCON1_REFDIV_SHIFT)
				& RK3036_PLLCON1_REFDIV_MASK);
	rate->postdiv2 = ((pllcon >> RK3036_PLLCON1_POSTDIV2_SHIFT)
				& RK3036_PLLCON1_POSTDIV2_MASK);
	rate->dsmpd = ((pllcon >> RK3036_PLLCON1_DSMPD_SHIFT)
				& RK3036_PLLCON1_DSMPD_MASK);

	pllcon = readl_relaxed(pll->reg_base + RK3036_PLLCON(2));
	rate->frac = ((pllcon >> RK3036_PLLCON2_FRAC_SHIFT)
				& RK3036_PLLCON2_FRAC_MASK);
}

static unsigned long rockchip_rk3036_pll_recalc_rate(struct clk_hw *hw,
						     unsigned long prate)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	struct rockchip_pll_rate_table cur;
	u64 rate64 = prate;

	rockchip_rk3036_pll_get_params(pll, &cur);

	rate64 *= cur.fbdiv;
	do_div(rate64, cur.refdiv);

	if (cur.dsmpd == 0) {
		/* fractional mode */
		u64 frac_rate64 = prate * cur.frac;

		do_div(frac_rate64, cur.refdiv);
		rate64 += frac_rate64 >> 24;
	}

	do_div(rate64, cur.postdiv1);
	do_div(rate64, cur.postdiv2);

	return (unsigned long)rate64;
}

static int rockchip_rk3036_pll_set_params(struct rockchip_clk_pll *pll,
				const struct rockchip_pll_rate_table *rate)
{
	const struct clk_ops *pll_mux_ops = pll->pll_mux_ops;
	struct clk_mux *pll_mux = &pll->pll_mux;
	struct rockchip_pll_rate_table cur;
	u32 pllcon;
	int rate_change_remuxed = 0;
	int cur_parent;
	int ret;

	pr_debug("%s: rate settings for %lu fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n",
		__func__, rate->rate, rate->fbdiv, rate->postdiv1, rate->refdiv,
		rate->postdiv2, rate->dsmpd, rate->frac);

	rockchip_rk3036_pll_get_params(pll, &cur);
	cur.rate = 0;

	cur_parent = pll_mux_ops->get_parent(&pll_mux->hw);
	if (cur_parent == PLL_MODE_NORM) {
		pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_SLOW);
		rate_change_remuxed = 1;
	}

	/* update pll values */
	writel_relaxed(HIWORD_UPDATE(rate->fbdiv, RK3036_PLLCON0_FBDIV_MASK,
					  RK3036_PLLCON0_FBDIV_SHIFT) |
		       HIWORD_UPDATE(rate->postdiv1, RK3036_PLLCON0_POSTDIV1_MASK,
					     RK3036_PLLCON0_POSTDIV1_SHIFT),
		       pll->reg_base + RK3036_PLLCON(0));

	writel_relaxed(HIWORD_UPDATE(rate->refdiv, RK3036_PLLCON1_REFDIV_MASK,
						   RK3036_PLLCON1_REFDIV_SHIFT) |
		       HIWORD_UPDATE(rate->postdiv2, RK3036_PLLCON1_POSTDIV2_MASK,
						     RK3036_PLLCON1_POSTDIV2_SHIFT) |
		       HIWORD_UPDATE(rate->dsmpd, RK3036_PLLCON1_DSMPD_MASK,
						  RK3036_PLLCON1_DSMPD_SHIFT),
		       pll->reg_base + RK3036_PLLCON(1));

	/* GPLL CON2 is not HIWORD_MASK */
	pllcon = readl_relaxed(pll->reg_base + RK3036_PLLCON(2));
	pllcon &= ~(RK3036_PLLCON2_FRAC_MASK << RK3036_PLLCON2_FRAC_SHIFT);
	pllcon |= rate->frac << RK3036_PLLCON2_FRAC_SHIFT;
	writel_relaxed(pllcon, pll->reg_base + RK3036_PLLCON(2));

	/* wait for the pll to lock */
	ret = rockchip_pll_wait_lock(pll);
	if (ret) {
		pr_warn("%s: pll update unsuccessful, trying to restore old params\n",
			__func__);
		rockchip_rk3036_pll_set_params(pll, &cur);
	}

	if (rate_change_remuxed)
		pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_NORM);

	return ret;
}

static int rockchip_rk3036_pll_set_rate(struct clk_hw *hw, unsigned long drate,
					unsigned long prate)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	const struct rockchip_pll_rate_table *rate;

	pr_debug("%s: changing %s to %lu with a parent rate of %lu\n",
		 __func__, __clk_get_name(hw->clk), drate, prate);

	/* Get required rate settings from table */
	rate = rockchip_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;
	}

	return rockchip_rk3036_pll_set_params(pll, rate);
}

static int rockchip_rk3036_pll_enable(struct clk_hw *hw)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);

	writel(HIWORD_UPDATE(0, RK3036_PLLCON1_PWRDOWN, 0),
	       pll->reg_base + RK3036_PLLCON(1));
	rockchip_pll_wait_lock(pll);

	return 0;
}

static void rockchip_rk3036_pll_disable(struct clk_hw *hw)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);

	writel(HIWORD_UPDATE(RK3036_PLLCON1_PWRDOWN,
			     RK3036_PLLCON1_PWRDOWN, 0),
	       pll->reg_base + RK3036_PLLCON(1));
}

static int rockchip_rk3036_pll_is_enabled(struct clk_hw *hw)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	u32 pllcon = readl(pll->reg_base + RK3036_PLLCON(1));

	return !(pllcon & RK3036_PLLCON1_PWRDOWN);
}

static void rockchip_rk3036_pll_init(struct clk_hw *hw)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	const struct rockchip_pll_rate_table *rate;
	struct rockchip_pll_rate_table cur;
	unsigned long drate;

	if (!(pll->flags & ROCKCHIP_PLL_SYNC_RATE))
		return;

	drate = clk_hw_get_rate(hw);
	rate = rockchip_get_pll_settings(pll, drate);

	/* when no rate setting for the current rate, rely on clk_set_rate */
	if (!rate)
		return;

	rockchip_rk3036_pll_get_params(pll, &cur);

	pr_debug("%s: pll %s@%lu: Hz\n", __func__, __clk_get_name(hw->clk),
		 drate);
	pr_debug("old - fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n",
		 cur.fbdiv, cur.postdiv1, cur.refdiv, cur.postdiv2,
		 cur.dsmpd, cur.frac);
	pr_debug("new - fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n",
		 rate->fbdiv, rate->postdiv1, rate->refdiv, rate->postdiv2,
		 rate->dsmpd, rate->frac);

	if (rate->fbdiv != cur.fbdiv || rate->postdiv1 != cur.postdiv1 ||
		rate->refdiv != cur.refdiv || rate->postdiv2 != cur.postdiv2 ||
		rate->dsmpd != cur.dsmpd ||
		(!cur.dsmpd && (rate->frac != cur.frac))) {
		struct clk *parent = clk_get_parent(hw->clk);

		if (!parent) {
			pr_warn("%s: parent of %s not available\n",
				__func__, __clk_get_name(hw->clk));
			return;
		}

		pr_debug("%s: pll %s: rate params do not match rate table, adjusting\n",
			 __func__, __clk_get_name(hw->clk));
		rockchip_rk3036_pll_set_params(pll, rate);
	}
}

static const struct clk_ops rockchip_rk3036_pll_clk_norate_ops = {
	.recalc_rate = rockchip_rk3036_pll_recalc_rate,
	.enable = rockchip_rk3036_pll_enable,
	.disable = rockchip_rk3036_pll_disable,
	.is_enabled = rockchip_rk3036_pll_is_enabled,
};

static const struct clk_ops rockchip_rk3036_pll_clk_ops = {
	.recalc_rate = rockchip_rk3036_pll_recalc_rate,
	.round_rate = rockchip_pll_round_rate,
	.set_rate = rockchip_rk3036_pll_set_rate,
	.enable = rockchip_rk3036_pll_enable,
	.disable = rockchip_rk3036_pll_disable,
	.is_enabled = rockchip_rk3036_pll_is_enabled,
	.init = rockchip_rk3036_pll_init,
};

/**
 * PLL used in RK3066, RK3188 and RK3288
 */

#define RK3066_PLL_RESET_DELAY(nr)	((nr * 500) / 24 + 1)

#define RK3066_PLLCON(i)		(i * 0x4)
#define RK3066_PLLCON0_OD_MASK		0xf
#define RK3066_PLLCON0_OD_SHIFT		0
#define RK3066_PLLCON0_NR_MASK		0x3f
#define RK3066_PLLCON0_NR_SHIFT		8
#define RK3066_PLLCON1_NF_MASK		0x1fff
#define RK3066_PLLCON1_NF_SHIFT		0
#define RK3066_PLLCON2_NB_MASK		0xfff
#define RK3066_PLLCON2_NB_SHIFT		0
#define RK3066_PLLCON3_RESET		(1 << 5)
#define RK3066_PLLCON3_PWRDOWN		(1 << 1)
#define RK3066_PLLCON3_BYPASS		(1 << 0)

static void rockchip_rk3066_pll_get_params(struct rockchip_clk_pll *pll,
					struct rockchip_pll_rate_table *rate)
{
	u32 pllcon;

	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(0));
	rate->nr = ((pllcon >> RK3066_PLLCON0_NR_SHIFT)
				& RK3066_PLLCON0_NR_MASK) + 1;
	rate->no = ((pllcon >> RK3066_PLLCON0_OD_SHIFT)
				& RK3066_PLLCON0_OD_MASK) + 1;

	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(1));
	rate->nf = ((pllcon >> RK3066_PLLCON1_NF_SHIFT)
				& RK3066_PLLCON1_NF_MASK) + 1;

	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(2));
	rate->nb = ((pllcon >> RK3066_PLLCON2_NB_SHIFT)
				& RK3066_PLLCON2_NB_MASK) + 1;
}

static unsigned long rockchip_rk3066_pll_recalc_rate(struct clk_hw *hw,
						     unsigned long prate)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	struct rockchip_pll_rate_table cur;
	u64 rate64 = prate;
	u32 pllcon;

	pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(3));
	if (pllcon & RK3066_PLLCON3_BYPASS) {
		pr_debug("%s: pll %s is bypassed\n", __func__,
			clk_hw_get_name(hw));
		return prate;
	}

	rockchip_rk3066_pll_get_params(pll, &cur);

	rate64 *= cur.nf;
	do_div(rate64, cur.nr);
	do_div(rate64, cur.no);

	return (unsigned long)rate64;
}

static int rockchip_rk3066_pll_set_params(struct rockchip_clk_pll *pll,
				const struct rockchip_pll_rate_table *rate)
{
	const struct clk_ops *pll_mux_ops = pll->pll_mux_ops;
	struct clk_mux *pll_mux = &pll->pll_mux;
	struct rockchip_pll_rate_table cur;
	int rate_change_remuxed = 0;
	int cur_parent;
	int ret;

	pr_debug("%s: rate settings for %lu (nr, no, nf): (%d, %d, %d)\n",
		 __func__, rate->rate, rate->nr, rate->no, rate->nf);

	rockchip_rk3066_pll_get_params(pll, &cur);
	cur.rate = 0;

	cur_parent = pll_mux_ops->get_parent(&pll_mux->hw);
	if (cur_parent == PLL_MODE_NORM) {
		pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_SLOW);
		rate_change_remuxed = 1;
	}

	/* enter reset mode */
	writel(HIWORD_UPDATE(RK3066_PLLCON3_RESET, RK3066_PLLCON3_RESET, 0),
	       pll->reg_base + RK3066_PLLCON(3));

	/* update pll values */
	writel(HIWORD_UPDATE(rate->nr - 1, RK3066_PLLCON0_NR_MASK,
					   RK3066_PLLCON0_NR_SHIFT) |
	       HIWORD_UPDATE(rate->no - 1, RK3066_PLLCON0_OD_MASK,
					   RK3066_PLLCON0_OD_SHIFT),
	       pll->reg_base + RK3066_PLLCON(0));

	writel_relaxed(HIWORD_UPDATE(rate->nf - 1, RK3066_PLLCON1_NF_MASK,
						   RK3066_PLLCON1_NF_SHIFT),
		       pll->reg_base + RK3066_PLLCON(1));
	writel_relaxed(HIWORD_UPDATE(rate->nb - 1, RK3066_PLLCON2_NB_MASK,
						   RK3066_PLLCON2_NB_SHIFT),
		       pll->reg_base + RK3066_PLLCON(2));

	/* leave reset and wait the reset_delay */
	writel(HIWORD_UPDATE(0, RK3066_PLLCON3_RESET, 0),
	       pll->reg_base + RK3066_PLLCON(3));
	udelay(RK3066_PLL_RESET_DELAY(rate->nr));

	/* wait for the pll to lock */
	ret = rockchip_pll_wait_lock(pll);
	if (ret) {
		pr_warn("%s: pll update unsuccessful, trying to restore old params\n",
			__func__);
		rockchip_rk3066_pll_set_params(pll, &cur);
	}

	if (rate_change_remuxed)
		pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_NORM);

	return ret;
}

static int rockchip_rk3066_pll_set_rate(struct clk_hw *hw, unsigned long drate,
					unsigned long prate)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	const struct rockchip_pll_rate_table *rate;

	pr_debug("%s: changing %s to %lu with a parent rate of %lu\n",
		 __func__, clk_hw_get_name(hw), drate, prate);

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

	return rockchip_rk3066_pll_set_params(pll, rate);
}

static int rockchip_rk3066_pll_enable(struct clk_hw *hw)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);

	writel(HIWORD_UPDATE(0, RK3066_PLLCON3_PWRDOWN, 0),
	       pll->reg_base + RK3066_PLLCON(3));
	rockchip_pll_wait_lock(pll);

	return 0;
}

static void rockchip_rk3066_pll_disable(struct clk_hw *hw)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);

	writel(HIWORD_UPDATE(RK3066_PLLCON3_PWRDOWN,
			     RK3066_PLLCON3_PWRDOWN, 0),
	       pll->reg_base + RK3066_PLLCON(3));
}

static int rockchip_rk3066_pll_is_enabled(struct clk_hw *hw)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	u32 pllcon = readl(pll->reg_base + RK3066_PLLCON(3));

	return !(pllcon & RK3066_PLLCON3_PWRDOWN);
}

static void rockchip_rk3066_pll_init(struct clk_hw *hw)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	const struct rockchip_pll_rate_table *rate;
	struct rockchip_pll_rate_table cur;
	unsigned long drate;

	if (!(pll->flags & ROCKCHIP_PLL_SYNC_RATE))
		return;

	drate = clk_hw_get_rate(hw);
	rate = rockchip_get_pll_settings(pll, drate);

	/* when no rate setting for the current rate, rely on clk_set_rate */
	if (!rate)
		return;

	rockchip_rk3066_pll_get_params(pll, &cur);

	pr_debug("%s: pll %s@%lu: nr (%d:%d); no (%d:%d); nf(%d:%d), nb(%d:%d)\n",
		 __func__, clk_hw_get_name(hw), drate, rate->nr, cur.nr,
		 rate->no, cur.no, rate->nf, cur.nf, rate->nb, cur.nb);
	if (rate->nr != cur.nr || rate->no != cur.no || rate->nf != cur.nf
						     || rate->nb != cur.nb) {
		pr_debug("%s: pll %s: rate params do not match rate table, adjusting\n",
			 __func__, clk_hw_get_name(hw));
		rockchip_rk3066_pll_set_params(pll, rate);
	}
}

static const struct clk_ops rockchip_rk3066_pll_clk_norate_ops = {
	.recalc_rate = rockchip_rk3066_pll_recalc_rate,
	.enable = rockchip_rk3066_pll_enable,
	.disable = rockchip_rk3066_pll_disable,
	.is_enabled = rockchip_rk3066_pll_is_enabled,
};

static const struct clk_ops rockchip_rk3066_pll_clk_ops = {
	.recalc_rate = rockchip_rk3066_pll_recalc_rate,
	.round_rate = rockchip_pll_round_rate,
	.set_rate = rockchip_rk3066_pll_set_rate,
	.enable = rockchip_rk3066_pll_enable,
	.disable = rockchip_rk3066_pll_disable,
	.is_enabled = rockchip_rk3066_pll_is_enabled,
	.init = rockchip_rk3066_pll_init,
};

/**
 * PLL used in RK3399
 */

#define RK3399_PLLCON(i)			(i * 0x4)
#define RK3399_PLLCON0_FBDIV_MASK		0xfff
#define RK3399_PLLCON0_FBDIV_SHIFT		0
#define RK3399_PLLCON1_REFDIV_MASK		0x3f
#define RK3399_PLLCON1_REFDIV_SHIFT		0
#define RK3399_PLLCON1_POSTDIV1_MASK		0x7
#define RK3399_PLLCON1_POSTDIV1_SHIFT		8
#define RK3399_PLLCON1_POSTDIV2_MASK		0x7
#define RK3399_PLLCON1_POSTDIV2_SHIFT		12
#define RK3399_PLLCON2_FRAC_MASK		0xffffff
#define RK3399_PLLCON2_FRAC_SHIFT		0
#define RK3399_PLLCON2_LOCK_STATUS		BIT(31)
#define RK3399_PLLCON3_PWRDOWN			BIT(0)
#define RK3399_PLLCON3_DSMPD_MASK		0x1
#define RK3399_PLLCON3_DSMPD_SHIFT		3

static int rockchip_rk3399_pll_wait_lock(struct rockchip_clk_pll *pll)
{
	u32 pllcon;
	int delay = 24000000;

	/* poll check the lock status in rk3399 xPLLCON2 */
	while (delay > 0) {
		pllcon = readl_relaxed(pll->reg_base + RK3399_PLLCON(2));
		if (pllcon & RK3399_PLLCON2_LOCK_STATUS)
			return 0;

		delay--;
	}

	pr_err("%s: timeout waiting for pll to lock\n", __func__);
	return -ETIMEDOUT;
}

static void rockchip_rk3399_pll_get_params(struct rockchip_clk_pll *pll,
					struct rockchip_pll_rate_table *rate)
{
	u32 pllcon;

	pllcon = readl_relaxed(pll->reg_base + RK3399_PLLCON(0));
	rate->fbdiv = ((pllcon >> RK3399_PLLCON0_FBDIV_SHIFT)
				& RK3399_PLLCON0_FBDIV_MASK);

	pllcon = readl_relaxed(pll->reg_base + RK3399_PLLCON(1));
	rate->refdiv = ((pllcon >> RK3399_PLLCON1_REFDIV_SHIFT)
				& RK3399_PLLCON1_REFDIV_MASK);
	rate->postdiv1 = ((pllcon >> RK3399_PLLCON1_POSTDIV1_SHIFT)
				& RK3399_PLLCON1_POSTDIV1_MASK);
	rate->postdiv2 = ((pllcon >> RK3399_PLLCON1_POSTDIV2_SHIFT)
				& RK3399_PLLCON1_POSTDIV2_MASK);

	pllcon = readl_relaxed(pll->reg_base + RK3399_PLLCON(2));
	rate->frac = ((pllcon >> RK3399_PLLCON2_FRAC_SHIFT)
				& RK3399_PLLCON2_FRAC_MASK);

	pllcon = readl_relaxed(pll->reg_base + RK3399_PLLCON(3));
	rate->dsmpd = ((pllcon >> RK3399_PLLCON3_DSMPD_SHIFT)
				& RK3399_PLLCON3_DSMPD_MASK);
}

static unsigned long rockchip_rk3399_pll_recalc_rate(struct clk_hw *hw,
						     unsigned long prate)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	struct rockchip_pll_rate_table cur;
	u64 rate64 = prate;

	rockchip_rk3399_pll_get_params(pll, &cur);

	rate64 *= cur.fbdiv;
	do_div(rate64, cur.refdiv);

	if (cur.dsmpd == 0) {
		/* fractional mode */
		u64 frac_rate64 = prate * cur.frac;

		do_div(frac_rate64, cur.refdiv);
		rate64 += frac_rate64 >> 24;
	}

	do_div(rate64, cur.postdiv1);
	do_div(rate64, cur.postdiv2);

	return (unsigned long)rate64;
}

static int rockchip_rk3399_pll_set_params(struct rockchip_clk_pll *pll,
				const struct rockchip_pll_rate_table *rate)
{
	const struct clk_ops *pll_mux_ops = pll->pll_mux_ops;
	struct clk_mux *pll_mux = &pll->pll_mux;
	struct rockchip_pll_rate_table cur;
	u32 pllcon;
	int rate_change_remuxed = 0;
	int cur_parent;
	int ret;

	pr_debug("%s: rate settings for %lu fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n",
		__func__, rate->rate, rate->fbdiv, rate->postdiv1, rate->refdiv,
		rate->postdiv2, rate->dsmpd, rate->frac);

	rockchip_rk3399_pll_get_params(pll, &cur);
	cur.rate = 0;

	cur_parent = pll_mux_ops->get_parent(&pll_mux->hw);
	if (cur_parent == PLL_MODE_NORM) {
		pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_SLOW);
		rate_change_remuxed = 1;
	}

	/* update pll values */
	writel_relaxed(HIWORD_UPDATE(rate->fbdiv, RK3399_PLLCON0_FBDIV_MASK,
						  RK3399_PLLCON0_FBDIV_SHIFT),
		       pll->reg_base + RK3399_PLLCON(0));

	writel_relaxed(HIWORD_UPDATE(rate->refdiv, RK3399_PLLCON1_REFDIV_MASK,
						   RK3399_PLLCON1_REFDIV_SHIFT) |
		       HIWORD_UPDATE(rate->postdiv1, RK3399_PLLCON1_POSTDIV1_MASK,
						     RK3399_PLLCON1_POSTDIV1_SHIFT) |
		       HIWORD_UPDATE(rate->postdiv2, RK3399_PLLCON1_POSTDIV2_MASK,
						     RK3399_PLLCON1_POSTDIV2_SHIFT),
		       pll->reg_base + RK3399_PLLCON(1));

	/* xPLL CON2 is not HIWORD_MASK */
	pllcon = readl_relaxed(pll->reg_base + RK3399_PLLCON(2));
	pllcon &= ~(RK3399_PLLCON2_FRAC_MASK << RK3399_PLLCON2_FRAC_SHIFT);
	pllcon |= rate->frac << RK3399_PLLCON2_FRAC_SHIFT;
	writel_relaxed(pllcon, pll->reg_base + RK3399_PLLCON(2));

	writel_relaxed(HIWORD_UPDATE(rate->dsmpd, RK3399_PLLCON3_DSMPD_MASK,
					    RK3399_PLLCON3_DSMPD_SHIFT),
		       pll->reg_base + RK3399_PLLCON(3));

	/* wait for the pll to lock */
	ret = rockchip_rk3399_pll_wait_lock(pll);
	if (ret) {
		pr_warn("%s: pll update unsuccessful, trying to restore old params\n",
			__func__);
		rockchip_rk3399_pll_set_params(pll, &cur);
	}

	if (rate_change_remuxed)
		pll_mux_ops->set_parent(&pll_mux->hw, PLL_MODE_NORM);

	return ret;
}

static int rockchip_rk3399_pll_set_rate(struct clk_hw *hw, unsigned long drate,
					unsigned long prate)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	const struct rockchip_pll_rate_table *rate;

	pr_debug("%s: changing %s to %lu with a parent rate of %lu\n",
		 __func__, __clk_get_name(hw->clk), drate, prate);

	/* Get required rate settings from table */
	rate = rockchip_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;
	}

	return rockchip_rk3399_pll_set_params(pll, rate);
}

static int rockchip_rk3399_pll_enable(struct clk_hw *hw)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);

	writel(HIWORD_UPDATE(0, RK3399_PLLCON3_PWRDOWN, 0),
	       pll->reg_base + RK3399_PLLCON(3));
	rockchip_rk3399_pll_wait_lock(pll);

	return 0;
}

static void rockchip_rk3399_pll_disable(struct clk_hw *hw)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);

	writel(HIWORD_UPDATE(RK3399_PLLCON3_PWRDOWN,
			     RK3399_PLLCON3_PWRDOWN, 0),
	       pll->reg_base + RK3399_PLLCON(3));
}

static int rockchip_rk3399_pll_is_enabled(struct clk_hw *hw)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	u32 pllcon = readl(pll->reg_base + RK3399_PLLCON(3));

	return !(pllcon & RK3399_PLLCON3_PWRDOWN);
}

static void rockchip_rk3399_pll_init(struct clk_hw *hw)
{
	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
	const struct rockchip_pll_rate_table *rate;
	struct rockchip_pll_rate_table cur;
	unsigned long drate;

	if (!(pll->flags & ROCKCHIP_PLL_SYNC_RATE))
		return;

	drate = clk_hw_get_rate(hw);
	rate = rockchip_get_pll_settings(pll, drate);

	/* when no rate setting for the current rate, rely on clk_set_rate */
	if (!rate)
		return;

	rockchip_rk3399_pll_get_params(pll, &cur);

	pr_debug("%s: pll %s@%lu: Hz\n", __func__, __clk_get_name(hw->clk),
		 drate);
	pr_debug("old - fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n",
		 cur.fbdiv, cur.postdiv1, cur.refdiv, cur.postdiv2,
		 cur.dsmpd, cur.frac);
	pr_debug("new - fbdiv: %d, postdiv1: %d, refdiv: %d, postdiv2: %d, dsmpd: %d, frac: %d\n",
		 rate->fbdiv, rate->postdiv1, rate->refdiv, rate->postdiv2,
		 rate->dsmpd, rate->frac);

	if (rate->fbdiv != cur.fbdiv || rate->postdiv1 != cur.postdiv1 ||
		rate->refdiv != cur.refdiv || rate->postdiv2 != cur.postdiv2 ||
		rate->dsmpd != cur.dsmpd ||
		(!cur.dsmpd && (rate->frac != cur.frac))) {
		struct clk *parent = clk_get_parent(hw->clk);

		if (!parent) {
			pr_warn("%s: parent of %s not available\n",
				__func__, __clk_get_name(hw->clk));
			return;
		}

		pr_debug("%s: pll %s: rate params do not match rate table, adjusting\n",
			 __func__, __clk_get_name(hw->clk));
		rockchip_rk3399_pll_set_params(pll, rate);
	}
}

static const struct clk_ops rockchip_rk3399_pll_clk_norate_ops = {
	.recalc_rate = rockchip_rk3399_pll_recalc_rate,
	.enable = rockchip_rk3399_pll_enable,
	.disable = rockchip_rk3399_pll_disable,
	.is_enabled = rockchip_rk3399_pll_is_enabled,
};

static const struct clk_ops rockchip_rk3399_pll_clk_ops = {
	.recalc_rate = rockchip_rk3399_pll_recalc_rate,
	.round_rate = rockchip_pll_round_rate,
	.set_rate = rockchip_rk3399_pll_set_rate,
	.enable = rockchip_rk3399_pll_enable,
	.disable = rockchip_rk3399_pll_disable,
	.is_enabled = rockchip_rk3399_pll_is_enabled,
	.init = rockchip_rk3399_pll_init,
};

/*
 * Common registering of pll clocks
 */

struct clk *rockchip_clk_register_pll(struct rockchip_clk_provider *ctx,
		enum rockchip_pll_type pll_type,
		const char *name, const char *const *parent_names,
		u8 num_parents, int con_offset, int grf_lock_offset,
		int lock_shift, int mode_offset, int mode_shift,
		struct rockchip_pll_rate_table *rate_table,
		unsigned long flags, u8 clk_pll_flags)
{
	const char *pll_parents[3];
	struct clk_init_data init;
	struct rockchip_clk_pll *pll;
	struct clk_mux *pll_mux;
	struct clk *pll_clk, *mux_clk;
	char pll_name[20];

	if ((pll_type != pll_rk3328 && num_parents != 2) ||
	    (pll_type == pll_rk3328 && num_parents != 1)) {
		pr_err("%s: needs two parent clocks\n", __func__);
		return ERR_PTR(-EINVAL);
	}

	/* name the actual pll */
	snprintf(pll_name, sizeof(pll_name), "pll_%s", name);

	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
	if (!pll)
		return ERR_PTR(-ENOMEM);

	/* create the mux on top of the real pll */
	pll->pll_mux_ops = &clk_mux_ops;
	pll_mux = &pll->pll_mux;
	pll_mux->reg = ctx->reg_base + mode_offset;
	pll_mux->shift = mode_shift;
	if (pll_type == pll_rk3328)
		pll_mux->mask = PLL_RK3328_MODE_MASK;
	else
		pll_mux->mask = PLL_MODE_MASK;
	pll_mux->flags = 0;
	pll_mux->lock = &ctx->lock;
	pll_mux->hw.init = &init;

	if (pll_type == pll_rk3036 ||
	    pll_type == pll_rk3066 ||
	    pll_type == pll_rk3328 ||
	    pll_type == pll_rk3399)
		pll_mux->flags |= CLK_MUX_HIWORD_MASK;

	/* the actual muxing is xin24m, pll-output, xin32k */
	pll_parents[0] = parent_names[0];
	pll_parents[1] = pll_name;
	pll_parents[2] = parent_names[1];

	init.name = name;
	init.flags = CLK_SET_RATE_PARENT;
	init.ops = pll->pll_mux_ops;
	init.parent_names = pll_parents;
	if (pll_type == pll_rk3328)
		init.num_parents = 2;
	else
		init.num_parents = ARRAY_SIZE(pll_parents);

	mux_clk = clk_register(NULL, &pll_mux->hw);
	if (IS_ERR(mux_clk))
		goto err_mux;

	/* now create the actual pll */
	init.name = pll_name;

	/* keep all plls untouched for now */
	init.flags = flags | CLK_IGNORE_UNUSED;

	init.parent_names = &parent_names[0];
	init.num_parents = 1;

	if (rate_table) {
		int len;

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

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

	switch (pll_type) {
	case pll_rk3036:
	case pll_rk3328:
		if (!pll->rate_table || IS_ERR(ctx->grf))
			init.ops = &rockchip_rk3036_pll_clk_norate_ops;
		else
			init.ops = &rockchip_rk3036_pll_clk_ops;
		break;
	case pll_rk3066:
		if (!pll->rate_table || IS_ERR(ctx->grf))
			init.ops = &rockchip_rk3066_pll_clk_norate_ops;
		else
			init.ops = &rockchip_rk3066_pll_clk_ops;
		break;
	case pll_rk3399:
		if (!pll->rate_table)
			init.ops = &rockchip_rk3399_pll_clk_norate_ops;
		else
			init.ops = &rockchip_rk3399_pll_clk_ops;
		break;
	default:
		pr_warn("%s: Unknown pll type for pll clk %s\n",
			__func__, name);
	}

	pll->hw.init = &init;
	pll->type = pll_type;
	pll->reg_base = ctx->reg_base + con_offset;
	pll->lock_offset = grf_lock_offset;
	pll->lock_shift = lock_shift;
	pll->flags = clk_pll_flags;
	pll->lock = &ctx->lock;
	pll->ctx = ctx;

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

	return mux_clk;

err_pll:
	clk_unregister(mux_clk);
	mux_clk = pll_clk;
err_mux:
	kfree(pll);
	return mux_clk;
}