summaryrefslogtreecommitdiff
path: root/drivers/clk/bcm/clk-iproc-pll.c
blob: 2d61893da0244d9acecc735afd02278cd5582108 (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
/*
 * Copyright (C) 2014 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/clkdev.h>
#include <linux/of_address.h>
#include <linux/delay.h>

#include "clk-iproc.h"

#define PLL_VCO_HIGH_SHIFT 19
#define PLL_VCO_LOW_SHIFT  30

/*
 * PLL MACRO_SELECT modes 0 to 5 choose pre-calculated PLL output frequencies
 * from a look-up table. Mode 7 allows user to manipulate PLL clock dividers
 */
#define PLL_USER_MODE 7

/* number of delay loops waiting for PLL to lock */
#define LOCK_DELAY 100

/* number of VCO frequency bands */
#define NUM_FREQ_BANDS 8

#define NUM_KP_BANDS 3
enum kp_band {
	KP_BAND_MID = 0,
	KP_BAND_HIGH,
	KP_BAND_HIGH_HIGH
};

static const unsigned int kp_table[NUM_KP_BANDS][NUM_FREQ_BANDS] = {
	{ 5, 6, 6, 7, 7, 8, 9, 10 },
	{ 4, 4, 5, 5, 6, 7, 8, 9  },
	{ 4, 5, 5, 6, 7, 8, 9, 10 },
};

static const unsigned long ref_freq_table[NUM_FREQ_BANDS][2] = {
	{ 10000000,  12500000  },
	{ 12500000,  15000000  },
	{ 15000000,  20000000  },
	{ 20000000,  25000000  },
	{ 25000000,  50000000  },
	{ 50000000,  75000000  },
	{ 75000000,  100000000 },
	{ 100000000, 125000000 },
};

enum vco_freq_range {
	VCO_LOW       = 700000000U,
	VCO_MID       = 1200000000U,
	VCO_HIGH      = 2200000000U,
	VCO_HIGH_HIGH = 3100000000U,
	VCO_MAX       = 4000000000U,
};

struct iproc_pll;

struct iproc_clk {
	struct clk_hw hw;
	const char *name;
	struct iproc_pll *pll;
	unsigned long rate;
	const struct iproc_clk_ctrl *ctrl;
};

struct iproc_pll {
	void __iomem *status_base;
	void __iomem *control_base;
	void __iomem *pwr_base;
	void __iomem *asiu_base;

	const struct iproc_pll_ctrl *ctrl;
	const struct iproc_pll_vco_param *vco_param;
	unsigned int num_vco_entries;

	struct clk_hw_onecell_data *clk_data;
	struct iproc_clk *clks;
};

#define to_iproc_clk(hw) container_of(hw, struct iproc_clk, hw)

/*
 * Based on the target frequency, find a match from the VCO frequency parameter
 * table and return its index
 */
static int pll_get_rate_index(struct iproc_pll *pll, unsigned int target_rate)
{
	int i;

	for (i = 0; i < pll->num_vco_entries; i++)
		if (target_rate == pll->vco_param[i].rate)
			break;

	if (i >= pll->num_vco_entries)
		return -EINVAL;

	return i;
}

static int get_kp(unsigned long ref_freq, enum kp_band kp_index)
{
	int i;

	if (ref_freq < ref_freq_table[0][0])
		return -EINVAL;

	for (i = 0; i < NUM_FREQ_BANDS; i++) {
		if (ref_freq >= ref_freq_table[i][0] &&
		    ref_freq < ref_freq_table[i][1])
			return kp_table[kp_index][i];
	}
	return -EINVAL;
}

static int pll_wait_for_lock(struct iproc_pll *pll)
{
	int i;
	const struct iproc_pll_ctrl *ctrl = pll->ctrl;

	for (i = 0; i < LOCK_DELAY; i++) {
		u32 val = readl(pll->status_base + ctrl->status.offset);

		if (val & (1 << ctrl->status.shift))
			return 0;
		udelay(10);
	}

	return -EIO;
}

static void iproc_pll_write(const struct iproc_pll *pll, void __iomem *base,
			    const u32 offset, u32 val)
{
	const struct iproc_pll_ctrl *ctrl = pll->ctrl;

	writel(val, base + offset);

	if (unlikely(ctrl->flags & IPROC_CLK_NEEDS_READ_BACK &&
		     (base == pll->status_base || base == pll->control_base)))
		val = readl(base + offset);
}

static void __pll_disable(struct iproc_pll *pll)
{
	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
	u32 val;

	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
		val = readl(pll->asiu_base + ctrl->asiu.offset);
		val &= ~(1 << ctrl->asiu.en_shift);
		iproc_pll_write(pll, pll->asiu_base, ctrl->asiu.offset, val);
	}

	if (ctrl->flags & IPROC_CLK_EMBED_PWRCTRL) {
		val = readl(pll->control_base + ctrl->aon.offset);
		val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
		iproc_pll_write(pll, pll->control_base, ctrl->aon.offset, val);
	}

	if (pll->pwr_base) {
		/* latch input value so core power can be shut down */
		val = readl(pll->pwr_base + ctrl->aon.offset);
		val |= 1 << ctrl->aon.iso_shift;
		iproc_pll_write(pll, pll->pwr_base, ctrl->aon.offset, val);

		/* power down the core */
		val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
		iproc_pll_write(pll, pll->pwr_base, ctrl->aon.offset, val);
	}
}

static int __pll_enable(struct iproc_pll *pll)
{
	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
	u32 val;

	if (ctrl->flags & IPROC_CLK_EMBED_PWRCTRL) {
		val = readl(pll->control_base + ctrl->aon.offset);
		val &= ~(bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift);
		iproc_pll_write(pll, pll->control_base, ctrl->aon.offset, val);
	}

	if (pll->pwr_base) {
		/* power up the PLL and make sure it's not latched */
		val = readl(pll->pwr_base + ctrl->aon.offset);
		val |= bit_mask(ctrl->aon.pwr_width) << ctrl->aon.pwr_shift;
		val &= ~(1 << ctrl->aon.iso_shift);
		iproc_pll_write(pll, pll->pwr_base, ctrl->aon.offset, val);
	}

	/* certain PLLs also need to be ungated from the ASIU top level */
	if (ctrl->flags & IPROC_CLK_PLL_ASIU) {
		val = readl(pll->asiu_base + ctrl->asiu.offset);
		val |= (1 << ctrl->asiu.en_shift);
		iproc_pll_write(pll, pll->asiu_base, ctrl->asiu.offset, val);
	}

	return 0;
}

static void __pll_put_in_reset(struct iproc_pll *pll)
{
	u32 val;
	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;

	val = readl(pll->control_base + reset->offset);
	if (ctrl->flags & IPROC_CLK_PLL_RESET_ACTIVE_LOW)
		val |= BIT(reset->reset_shift) | BIT(reset->p_reset_shift);
	else
		val &= ~(BIT(reset->reset_shift) | BIT(reset->p_reset_shift));
	iproc_pll_write(pll, pll->control_base, reset->offset, val);
}

static void __pll_bring_out_reset(struct iproc_pll *pll, unsigned int kp,
				  unsigned int ka, unsigned int ki)
{
	u32 val;
	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
	const struct iproc_pll_reset_ctrl *reset = &ctrl->reset;
	const struct iproc_pll_dig_filter_ctrl *dig_filter = &ctrl->dig_filter;

	val = readl(pll->control_base + dig_filter->offset);
	val &= ~(bit_mask(dig_filter->ki_width) << dig_filter->ki_shift |
		bit_mask(dig_filter->kp_width) << dig_filter->kp_shift |
		bit_mask(dig_filter->ka_width) << dig_filter->ka_shift);
	val |= ki << dig_filter->ki_shift | kp << dig_filter->kp_shift |
	       ka << dig_filter->ka_shift;
	iproc_pll_write(pll, pll->control_base, dig_filter->offset, val);

	val = readl(pll->control_base + reset->offset);
	if (ctrl->flags & IPROC_CLK_PLL_RESET_ACTIVE_LOW)
		val &= ~(BIT(reset->reset_shift) | BIT(reset->p_reset_shift));
	else
		val |= BIT(reset->reset_shift) | BIT(reset->p_reset_shift);
	iproc_pll_write(pll, pll->control_base, reset->offset, val);
}

static int pll_set_rate(struct iproc_clk *clk, unsigned int rate_index,
			unsigned long parent_rate)
{
	struct iproc_pll *pll = clk->pll;
	const struct iproc_pll_vco_param *vco = &pll->vco_param[rate_index];
	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
	int ka = 0, ki, kp, ret;
	unsigned long rate = vco->rate;
	u32 val;
	enum kp_band kp_index;
	unsigned long ref_freq;

	/*
	 * reference frequency = parent frequency / PDIV
	 * If PDIV = 0, then it becomes a multiplier (x2)
	 */
	if (vco->pdiv == 0)
		ref_freq = parent_rate * 2;
	else
		ref_freq = parent_rate / vco->pdiv;

	/* determine Ki and Kp index based on target VCO frequency */
	if (rate >= VCO_LOW && rate < VCO_HIGH) {
		ki = 4;
		kp_index = KP_BAND_MID;
	} else if (rate >= VCO_HIGH && rate < VCO_HIGH_HIGH) {
		ki = 3;
		kp_index = KP_BAND_HIGH;
	} else if (rate >= VCO_HIGH_HIGH && rate < VCO_MAX) {
		ki = 3;
		kp_index = KP_BAND_HIGH_HIGH;
	} else {
		pr_err("%s: pll: %s has invalid rate: %lu\n", __func__,
				clk->name, rate);
		return -EINVAL;
	}

	kp = get_kp(ref_freq, kp_index);
	if (kp < 0) {
		pr_err("%s: pll: %s has invalid kp\n", __func__, clk->name);
		return kp;
	}

	ret = __pll_enable(pll);
	if (ret) {
		pr_err("%s: pll: %s fails to enable\n", __func__, clk->name);
		return ret;
	}

	/* put PLL in reset */
	__pll_put_in_reset(pll);

	/* set PLL in user mode before modifying PLL controls */
	if (ctrl->flags & IPROC_CLK_PLL_USER_MODE_ON) {
		val = readl(pll->control_base + ctrl->macro_mode.offset);
		val &= ~(bit_mask(ctrl->macro_mode.width) <<
			ctrl->macro_mode.shift);
		val |= PLL_USER_MODE << ctrl->macro_mode.shift;
		iproc_pll_write(pll, pll->control_base,
			ctrl->macro_mode.offset, val);
	}

	iproc_pll_write(pll, pll->control_base, ctrl->vco_ctrl.u_offset, 0);

	val = readl(pll->control_base + ctrl->vco_ctrl.l_offset);

	if (rate >= VCO_LOW && rate < VCO_MID)
		val |= (1 << PLL_VCO_LOW_SHIFT);

	if (rate < VCO_HIGH)
		val &= ~(1 << PLL_VCO_HIGH_SHIFT);
	else
		val |= (1 << PLL_VCO_HIGH_SHIFT);

	iproc_pll_write(pll, pll->control_base, ctrl->vco_ctrl.l_offset, val);

	/* program integer part of NDIV */
	val = readl(pll->control_base + ctrl->ndiv_int.offset);
	val &= ~(bit_mask(ctrl->ndiv_int.width) << ctrl->ndiv_int.shift);
	val |= vco->ndiv_int << ctrl->ndiv_int.shift;
	iproc_pll_write(pll, pll->control_base, ctrl->ndiv_int.offset, val);

	/* program fractional part of NDIV */
	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
		val = readl(pll->control_base + ctrl->ndiv_frac.offset);
		val &= ~(bit_mask(ctrl->ndiv_frac.width) <<
			 ctrl->ndiv_frac.shift);
		val |= vco->ndiv_frac << ctrl->ndiv_frac.shift;
		iproc_pll_write(pll, pll->control_base, ctrl->ndiv_frac.offset,
				val);
	}

	/* program PDIV */
	val = readl(pll->control_base + ctrl->pdiv.offset);
	val &= ~(bit_mask(ctrl->pdiv.width) << ctrl->pdiv.shift);
	val |= vco->pdiv << ctrl->pdiv.shift;
	iproc_pll_write(pll, pll->control_base, ctrl->pdiv.offset, val);

	__pll_bring_out_reset(pll, kp, ka, ki);

	ret = pll_wait_for_lock(pll);
	if (ret < 0) {
		pr_err("%s: pll: %s failed to lock\n", __func__, clk->name);
		return ret;
	}

	return 0;
}

static int iproc_pll_enable(struct clk_hw *hw)
{
	struct iproc_clk *clk = to_iproc_clk(hw);
	struct iproc_pll *pll = clk->pll;

	return __pll_enable(pll);
}

static void iproc_pll_disable(struct clk_hw *hw)
{
	struct iproc_clk *clk = to_iproc_clk(hw);
	struct iproc_pll *pll = clk->pll;
	const struct iproc_pll_ctrl *ctrl = pll->ctrl;

	if (ctrl->flags & IPROC_CLK_AON)
		return;

	__pll_disable(pll);
}

static unsigned long iproc_pll_recalc_rate(struct clk_hw *hw,
					   unsigned long parent_rate)
{
	struct iproc_clk *clk = to_iproc_clk(hw);
	struct iproc_pll *pll = clk->pll;
	const struct iproc_pll_ctrl *ctrl = pll->ctrl;
	u32 val;
	u64 ndiv, ndiv_int, ndiv_frac;
	unsigned int pdiv;

	if (parent_rate == 0)
		return 0;

	/* PLL needs to be locked */
	val = readl(pll->status_base + ctrl->status.offset);
	if ((val & (1 << ctrl->status.shift)) == 0) {
		clk->rate = 0;
		return 0;
	}

	/*
	 * PLL output frequency =
	 *
	 * ((ndiv_int + ndiv_frac / 2^20) * (parent clock rate / pdiv)
	 */
	val = readl(pll->control_base + ctrl->ndiv_int.offset);
	ndiv_int = (val >> ctrl->ndiv_int.shift) &
		bit_mask(ctrl->ndiv_int.width);
	ndiv = ndiv_int << 20;

	if (ctrl->flags & IPROC_CLK_PLL_HAS_NDIV_FRAC) {
		val = readl(pll->control_base + ctrl->ndiv_frac.offset);
		ndiv_frac = (val >> ctrl->ndiv_frac.shift) &
			bit_mask(ctrl->ndiv_frac.width);
		ndiv += ndiv_frac;
	}

	val = readl(pll->control_base + ctrl->pdiv.offset);
	pdiv = (val >> ctrl->pdiv.shift) & bit_mask(ctrl->pdiv.width);

	clk->rate = (ndiv * parent_rate) >> 20;

	if (pdiv == 0)
		clk->rate *= 2;
	else
		clk->rate /= pdiv;

	return clk->rate;
}

static long iproc_pll_round_rate(struct clk_hw *hw, unsigned long rate,
				 unsigned long *parent_rate)
{
	unsigned i;
	struct iproc_clk *clk = to_iproc_clk(hw);
	struct iproc_pll *pll = clk->pll;

	if (rate == 0 || *parent_rate == 0 || !pll->vco_param)
		return -EINVAL;

	for (i = 0; i < pll->num_vco_entries; i++) {
		if (rate <= pll->vco_param[i].rate)
			break;
	}

	if (i == pll->num_vco_entries)
		i--;

	return pll->vco_param[i].rate;
}

static int iproc_pll_set_rate(struct clk_hw *hw, unsigned long rate,
		unsigned long parent_rate)
{
	struct iproc_clk *clk = to_iproc_clk(hw);
	struct iproc_pll *pll = clk->pll;
	int rate_index, ret;

	rate_index = pll_get_rate_index(pll, rate);
	if (rate_index < 0)
		return rate_index;

	ret = pll_set_rate(clk, rate_index, parent_rate);
	return ret;
}

static const struct clk_ops iproc_pll_ops = {
	.enable = iproc_pll_enable,
	.disable = iproc_pll_disable,
	.recalc_rate = iproc_pll_recalc_rate,
	.round_rate = iproc_pll_round_rate,
	.set_rate = iproc_pll_set_rate,
};

static int iproc_clk_enable(struct clk_hw *hw)
{
	struct iproc_clk *clk = to_iproc_clk(hw);
	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
	struct iproc_pll *pll = clk->pll;
	u32 val;

	/* channel enable is active low */
	val = readl(pll->control_base + ctrl->enable.offset);
	val &= ~(1 << ctrl->enable.enable_shift);
	iproc_pll_write(pll, pll->control_base, ctrl->enable.offset, val);

	/* also make sure channel is not held */
	val = readl(pll->control_base + ctrl->enable.offset);
	val &= ~(1 << ctrl->enable.hold_shift);
	iproc_pll_write(pll, pll->control_base, ctrl->enable.offset, val);

	return 0;
}

static void iproc_clk_disable(struct clk_hw *hw)
{
	struct iproc_clk *clk = to_iproc_clk(hw);
	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
	struct iproc_pll *pll = clk->pll;
	u32 val;

	if (ctrl->flags & IPROC_CLK_AON)
		return;

	val = readl(pll->control_base + ctrl->enable.offset);
	val |= 1 << ctrl->enable.enable_shift;
	iproc_pll_write(pll, pll->control_base, ctrl->enable.offset, val);
}

static unsigned long iproc_clk_recalc_rate(struct clk_hw *hw,
		unsigned long parent_rate)
{
	struct iproc_clk *clk = to_iproc_clk(hw);
	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
	struct iproc_pll *pll = clk->pll;
	u32 val;
	unsigned int mdiv;

	if (parent_rate == 0)
		return 0;

	val = readl(pll->control_base + ctrl->mdiv.offset);
	mdiv = (val >> ctrl->mdiv.shift) & bit_mask(ctrl->mdiv.width);
	if (mdiv == 0)
		mdiv = 256;

	if (ctrl->flags & IPROC_CLK_MCLK_DIV_BY_2)
		clk->rate = parent_rate / (mdiv * 2);
	else
		clk->rate = parent_rate / mdiv;

	return clk->rate;
}

static long iproc_clk_round_rate(struct clk_hw *hw, unsigned long rate,
		unsigned long *parent_rate)
{
	unsigned int div;

	if (rate == 0 || *parent_rate == 0)
		return -EINVAL;

	if (rate == *parent_rate)
		return *parent_rate;

	div = DIV_ROUND_UP(*parent_rate, rate);
	if (div < 2)
		return *parent_rate;

	if (div > 256)
		div = 256;

	return *parent_rate / div;
}

static int iproc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
		unsigned long parent_rate)
{
	struct iproc_clk *clk = to_iproc_clk(hw);
	const struct iproc_clk_ctrl *ctrl = clk->ctrl;
	struct iproc_pll *pll = clk->pll;
	u32 val;
	unsigned int div;

	if (rate == 0 || parent_rate == 0)
		return -EINVAL;

	if (ctrl->flags & IPROC_CLK_MCLK_DIV_BY_2)
		div = DIV_ROUND_UP(parent_rate, rate * 2);
	else
		div = DIV_ROUND_UP(parent_rate, rate);
	if (div > 256)
		return -EINVAL;

	val = readl(pll->control_base + ctrl->mdiv.offset);
	if (div == 256) {
		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
	} else {
		val &= ~(bit_mask(ctrl->mdiv.width) << ctrl->mdiv.shift);
		val |= div << ctrl->mdiv.shift;
	}
	iproc_pll_write(pll, pll->control_base, ctrl->mdiv.offset, val);
	if (ctrl->flags & IPROC_CLK_MCLK_DIV_BY_2)
		clk->rate = parent_rate / (div * 2);
	else
		clk->rate = parent_rate / div;

	return 0;
}

static const struct clk_ops iproc_clk_ops = {
	.enable = iproc_clk_enable,
	.disable = iproc_clk_disable,
	.recalc_rate = iproc_clk_recalc_rate,
	.round_rate = iproc_clk_round_rate,
	.set_rate = iproc_clk_set_rate,
};

/**
 * Some PLLs require the PLL SW override bit to be set before changes can be
 * applied to the PLL
 */
static void iproc_pll_sw_cfg(struct iproc_pll *pll)
{
	const struct iproc_pll_ctrl *ctrl = pll->ctrl;

	if (ctrl->flags & IPROC_CLK_PLL_NEEDS_SW_CFG) {
		u32 val;

		val = readl(pll->control_base + ctrl->sw_ctrl.offset);
		val |= BIT(ctrl->sw_ctrl.shift);
		iproc_pll_write(pll, pll->control_base, ctrl->sw_ctrl.offset,
				val);
	}
}

void __init iproc_pll_clk_setup(struct device_node *node,
				const struct iproc_pll_ctrl *pll_ctrl,
				const struct iproc_pll_vco_param *vco,
				unsigned int num_vco_entries,
				const struct iproc_clk_ctrl *clk_ctrl,
				unsigned int num_clks)
{
	int i, ret;
	struct iproc_pll *pll;
	struct iproc_clk *iclk;
	struct clk_init_data init;
	const char *parent_name;

	if (WARN_ON(!pll_ctrl) || WARN_ON(!clk_ctrl))
		return;

	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
	if (WARN_ON(!pll))
		return;

	pll->clk_data = kzalloc(sizeof(*pll->clk_data->hws) * num_clks +
				sizeof(*pll->clk_data), GFP_KERNEL);
	if (WARN_ON(!pll->clk_data))
		goto err_clk_data;
	pll->clk_data->num = num_clks;

	pll->clks = kcalloc(num_clks, sizeof(*pll->clks), GFP_KERNEL);
	if (WARN_ON(!pll->clks))
		goto err_clks;

	pll->control_base = of_iomap(node, 0);
	if (WARN_ON(!pll->control_base))
		goto err_pll_iomap;

	/* Some SoCs do not require the pwr_base, thus failing is not fatal */
	pll->pwr_base = of_iomap(node, 1);

	/* some PLLs require gating control at the top ASIU level */
	if (pll_ctrl->flags & IPROC_CLK_PLL_ASIU) {
		pll->asiu_base = of_iomap(node, 2);
		if (WARN_ON(!pll->asiu_base))
			goto err_asiu_iomap;
	}

	if (pll_ctrl->flags & IPROC_CLK_PLL_SPLIT_STAT_CTRL) {
		/* Some SoCs have a split status/control.  If this does not
		 * exist, assume they are unified.
		 */
		pll->status_base = of_iomap(node, 2);
		if (!pll->status_base)
			goto err_status_iomap;
	} else
		pll->status_base = pll->control_base;

	/* initialize and register the PLL itself */
	pll->ctrl = pll_ctrl;

	iclk = &pll->clks[0];
	iclk->pll = pll;
	iclk->name = node->name;

	init.name = node->name;
	init.ops = &iproc_pll_ops;
	init.flags = 0;
	parent_name = of_clk_get_parent_name(node, 0);
	init.parent_names = (parent_name ? &parent_name : NULL);
	init.num_parents = (parent_name ? 1 : 0);
	iclk->hw.init = &init;

	if (vco) {
		pll->num_vco_entries = num_vco_entries;
		pll->vco_param = vco;
	}

	iproc_pll_sw_cfg(pll);

	ret = clk_hw_register(NULL, &iclk->hw);
	if (WARN_ON(ret))
		goto err_pll_register;

	pll->clk_data->hws[0] = &iclk->hw;

	/* now initialize and register all leaf clocks */
	for (i = 1; i < num_clks; i++) {
		const char *clk_name;

		memset(&init, 0, sizeof(init));
		parent_name = node->name;

		ret = of_property_read_string_index(node, "clock-output-names",
						    i, &clk_name);
		if (WARN_ON(ret))
			goto err_clk_register;

		iclk = &pll->clks[i];
		iclk->name = clk_name;
		iclk->pll = pll;
		iclk->ctrl = &clk_ctrl[i];

		init.name = clk_name;
		init.ops = &iproc_clk_ops;
		init.flags = 0;
		init.parent_names = (parent_name ? &parent_name : NULL);
		init.num_parents = (parent_name ? 1 : 0);
		iclk->hw.init = &init;

		ret = clk_hw_register(NULL, &iclk->hw);
		if (WARN_ON(ret))
			goto err_clk_register;

		pll->clk_data->hws[i] = &iclk->hw;
	}

	ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get,
				     pll->clk_data);
	if (WARN_ON(ret))
		goto err_clk_register;

	return;

err_clk_register:
	while (--i >= 0)
		clk_hw_unregister(pll->clk_data->hws[i]);

err_pll_register:
	if (pll->status_base != pll->control_base)
		iounmap(pll->status_base);

err_status_iomap:
	if (pll->asiu_base)
		iounmap(pll->asiu_base);

err_asiu_iomap:
	if (pll->pwr_base)
		iounmap(pll->pwr_base);

	iounmap(pll->control_base);

err_pll_iomap:
	kfree(pll->clks);

err_clks:
	kfree(pll->clk_data);

err_clk_data:
	kfree(pll);
}