summaryrefslogtreecommitdiffstats
path: root/drivers/clk/mmp/clk-mix.c
blob: d2cd36c54474f635f7273ec43f7ccd60a66fbf65 (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
/*
 * mmp mix(div and mux) clock operation source file
 *
 * Copyright (C) 2014 Marvell
 * Chao Xie <chao.xie@marvell.com>
 *
 * 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/clk-provider.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/err.h>

#include "clk.h"

/*
 * The mix clock is a clock combined mux and div type clock.
 * Because the div field and mux field need to be set at same
 * time, we can not divide it into 2 types of clock
 */

#define to_clk_mix(hw)	container_of(hw, struct mmp_clk_mix, hw)

static unsigned int _get_maxdiv(struct mmp_clk_mix *mix)
{
	unsigned int div_mask = (1 << mix->reg_info.width_div) - 1;
	unsigned int maxdiv = 0;
	struct clk_div_table *clkt;

	if (mix->div_flags & CLK_DIVIDER_ONE_BASED)
		return div_mask;
	if (mix->div_flags & CLK_DIVIDER_POWER_OF_TWO)
		return 1 << div_mask;
	if (mix->div_table) {
		for (clkt = mix->div_table; clkt->div; clkt++)
			if (clkt->div > maxdiv)
				maxdiv = clkt->div;
		return maxdiv;
	}
	return div_mask + 1;
}

static unsigned int _get_div(struct mmp_clk_mix *mix, unsigned int val)
{
	struct clk_div_table *clkt;

	if (mix->div_flags & CLK_DIVIDER_ONE_BASED)
		return val;
	if (mix->div_flags & CLK_DIVIDER_POWER_OF_TWO)
		return 1 << val;
	if (mix->div_table) {
		for (clkt = mix->div_table; clkt->div; clkt++)
			if (clkt->val == val)
				return clkt->div;
		if (clkt->div == 0)
			return 0;
	}
	return val + 1;
}

static unsigned int _get_mux(struct mmp_clk_mix *mix, unsigned int val)
{
	int num_parents = clk_hw_get_num_parents(&mix->hw);
	int i;

	if (mix->mux_flags & CLK_MUX_INDEX_BIT)
		return ffs(val) - 1;
	if (mix->mux_flags & CLK_MUX_INDEX_ONE)
		return val - 1;
	if (mix->mux_table) {
		for (i = 0; i < num_parents; i++)
			if (mix->mux_table[i] == val)
				return i;
		if (i == num_parents)
			return 0;
	}

	return val;
}
static unsigned int _get_div_val(struct mmp_clk_mix *mix, unsigned int div)
{
	struct clk_div_table *clkt;

	if (mix->div_flags & CLK_DIVIDER_ONE_BASED)
		return div;
	if (mix->div_flags & CLK_DIVIDER_POWER_OF_TWO)
		return __ffs(div);
	if (mix->div_table) {
		for (clkt = mix->div_table; clkt->div; clkt++)
			if (clkt->div == div)
				return clkt->val;
		if (clkt->div == 0)
			return 0;
	}

	return div - 1;
}

static unsigned int _get_mux_val(struct mmp_clk_mix *mix, unsigned int mux)
{
	if (mix->mux_table)
		return mix->mux_table[mux];

	return mux;
}

static void _filter_clk_table(struct mmp_clk_mix *mix,
				struct mmp_clk_mix_clk_table *table,
				unsigned int table_size)
{
	int i;
	struct mmp_clk_mix_clk_table *item;
	struct clk_hw *parent, *hw;
	unsigned long parent_rate;

	hw = &mix->hw;

	for (i = 0; i < table_size; i++) {
		item = &table[i];
		parent = clk_hw_get_parent_by_index(hw, item->parent_index);
		parent_rate = clk_hw_get_rate(parent);
		if (parent_rate % item->rate) {
			item->valid = 0;
		} else {
			item->divisor = parent_rate / item->rate;
			item->valid = 1;
		}
	}
}

static int _set_rate(struct mmp_clk_mix *mix, u32 mux_val, u32 div_val,
			unsigned int change_mux, unsigned int change_div)
{
	struct mmp_clk_mix_reg_info *ri = &mix->reg_info;
	u8 width, shift;
	u32 mux_div, fc_req;
	int ret, timeout = 50;
	unsigned long flags = 0;

	if (!change_mux && !change_div)
		return -EINVAL;

	if (mix->lock)
		spin_lock_irqsave(mix->lock, flags);

	if (mix->type == MMP_CLK_MIX_TYPE_V1
		|| mix->type == MMP_CLK_MIX_TYPE_V2)
		mux_div = readl(ri->reg_clk_ctrl);
	else
		mux_div = readl(ri->reg_clk_sel);

	if (change_div) {
		width = ri->width_div;
		shift = ri->shift_div;
		mux_div &= ~MMP_CLK_BITS_MASK(width, shift);
		mux_div |= MMP_CLK_BITS_SET_VAL(div_val, width, shift);
	}

	if (change_mux) {
		width = ri->width_mux;
		shift = ri->shift_mux;
		mux_div &= ~MMP_CLK_BITS_MASK(width, shift);
		mux_div |= MMP_CLK_BITS_SET_VAL(mux_val, width, shift);
	}

	if (mix->type == MMP_CLK_MIX_TYPE_V1) {
		writel(mux_div, ri->reg_clk_ctrl);
	} else if (mix->type == MMP_CLK_MIX_TYPE_V2) {
		mux_div |= (1 << ri->bit_fc);
		writel(mux_div, ri->reg_clk_ctrl);

		do {
			fc_req = readl(ri->reg_clk_ctrl);
			timeout--;
			if (!(fc_req & (1 << ri->bit_fc)))
				break;
		} while (timeout);

		if (timeout == 0) {
			pr_err("%s:%s cannot do frequency change\n",
				__func__, clk_hw_get_name(&mix->hw));
			ret = -EBUSY;
			goto error;
		}
	} else {
		fc_req = readl(ri->reg_clk_ctrl);
		fc_req |= 1 << ri->bit_fc;
		writel(fc_req, ri->reg_clk_ctrl);
		writel(mux_div, ri->reg_clk_sel);
		fc_req &= ~(1 << ri->bit_fc);
	}

	ret = 0;
error:
	if (mix->lock)
		spin_unlock_irqrestore(mix->lock, flags);

	return ret;
}

static int mmp_clk_mix_determine_rate(struct clk_hw *hw,
				      struct clk_rate_request *req)
{
	struct mmp_clk_mix *mix = to_clk_mix(hw);
	struct mmp_clk_mix_clk_table *item;
	struct clk_hw *parent, *parent_best;
	unsigned long parent_rate, mix_rate, mix_rate_best, parent_rate_best;
	unsigned long gap, gap_best;
	u32 div_val_max;
	unsigned int div;
	int i, j;


	mix_rate_best = 0;
	parent_rate_best = 0;
	gap_best = ULONG_MAX;
	parent_best = NULL;

	if (mix->table) {
		for (i = 0; i < mix->table_size; i++) {
			item = &mix->table[i];
			if (item->valid == 0)
				continue;
			parent = clk_hw_get_parent_by_index(hw,
							item->parent_index);
			parent_rate = clk_hw_get_rate(parent);
			mix_rate = parent_rate / item->divisor;
			gap = abs(mix_rate - req->rate);
			if (!parent_best || gap < gap_best) {
				parent_best = parent;
				parent_rate_best = parent_rate;
				mix_rate_best = mix_rate;
				gap_best = gap;
				if (gap_best == 0)
					goto found;
			}
		}
	} else {
		for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
			parent = clk_hw_get_parent_by_index(hw, i);
			parent_rate = clk_hw_get_rate(parent);
			div_val_max = _get_maxdiv(mix);
			for (j = 0; j < div_val_max; j++) {
				div = _get_div(mix, j);
				mix_rate = parent_rate / div;
				gap = abs(mix_rate - req->rate);
				if (!parent_best || gap < gap_best) {
					parent_best = parent;
					parent_rate_best = parent_rate;
					mix_rate_best = mix_rate;
					gap_best = gap;
					if (gap_best == 0)
						goto found;
				}
			}
		}
	}

found:
	if (!parent_best)
		return -EINVAL;

	req->best_parent_rate = parent_rate_best;
	req->best_parent_hw = parent_best;
	req->rate = mix_rate_best;

	return 0;
}

static int mmp_clk_mix_set_rate_and_parent(struct clk_hw *hw,
						unsigned long rate,
						unsigned long parent_rate,
						u8 index)
{
	struct mmp_clk_mix *mix = to_clk_mix(hw);
	unsigned int div;
	u32 div_val, mux_val;

	div = parent_rate / rate;
	div_val = _get_div_val(mix, div);
	mux_val = _get_mux_val(mix, index);

	return _set_rate(mix, mux_val, div_val, 1, 1);
}

static u8 mmp_clk_mix_get_parent(struct clk_hw *hw)
{
	struct mmp_clk_mix *mix = to_clk_mix(hw);
	struct mmp_clk_mix_reg_info *ri = &mix->reg_info;
	unsigned long flags = 0;
	u32 mux_div = 0;
	u8 width, shift;
	u32 mux_val;

	if (mix->lock)
		spin_lock_irqsave(mix->lock, flags);

	if (mix->type == MMP_CLK_MIX_TYPE_V1
		|| mix->type == MMP_CLK_MIX_TYPE_V2)
		mux_div = readl(ri->reg_clk_ctrl);
	else
		mux_div = readl(ri->reg_clk_sel);

	if (mix->lock)
		spin_unlock_irqrestore(mix->lock, flags);

	width = mix->reg_info.width_mux;
	shift = mix->reg_info.shift_mux;

	mux_val = MMP_CLK_BITS_GET_VAL(mux_div, width, shift);

	return _get_mux(mix, mux_val);
}

static unsigned long mmp_clk_mix_recalc_rate(struct clk_hw *hw,
					unsigned long parent_rate)
{
	struct mmp_clk_mix *mix = to_clk_mix(hw);
	struct mmp_clk_mix_reg_info *ri = &mix->reg_info;
	unsigned long flags = 0;
	u32 mux_div = 0;
	u8 width, shift;
	unsigned int div;

	if (mix->lock)
		spin_lock_irqsave(mix->lock, flags);

	if (mix->type == MMP_CLK_MIX_TYPE_V1
		|| mix->type == MMP_CLK_MIX_TYPE_V2)
		mux_div = readl(ri->reg_clk_ctrl);
	else
		mux_div = readl(ri->reg_clk_sel);

	if (mix->lock)
		spin_unlock_irqrestore(mix->lock, flags);

	width = mix->reg_info.width_div;
	shift = mix->reg_info.shift_div;

	div = _get_div(mix, MMP_CLK_BITS_GET_VAL(mux_div, width, shift));

	return parent_rate / div;
}

static int mmp_clk_set_parent(struct clk_hw *hw, u8 index)
{
	struct mmp_clk_mix *mix = to_clk_mix(hw);
	struct mmp_clk_mix_clk_table *item;
	int i;
	u32 div_val, mux_val;

	if (mix->table) {
		for (i = 0; i < mix->table_size; i++) {
			item = &mix->table[i];
			if (item->valid == 0)
				continue;
			if (item->parent_index == index)
				break;
		}
		if (i < mix->table_size) {
			div_val = _get_div_val(mix, item->divisor);
			mux_val = _get_mux_val(mix, item->parent_index);
		} else
			return -EINVAL;
	} else {
		mux_val = _get_mux_val(mix, index);
		div_val = 0;
	}

	return _set_rate(mix, mux_val, div_val, 1, div_val ? 1 : 0);
}

static int mmp_clk_set_rate(struct clk_hw *hw, unsigned long rate,
				unsigned long best_parent_rate)
{
	struct mmp_clk_mix *mix = to_clk_mix(hw);
	struct mmp_clk_mix_clk_table *item;
	unsigned long parent_rate;
	unsigned int best_divisor;
	struct clk_hw *parent;
	int i;

	best_divisor = best_parent_rate / rate;

	if (mix->table) {
		for (i = 0; i < mix->table_size; i++) {
			item = &mix->table[i];
			if (item->valid == 0)
				continue;
			parent = clk_hw_get_parent_by_index(hw,
							item->parent_index);
			parent_rate = clk_hw_get_rate(parent);
			if (parent_rate == best_parent_rate
				&& item->divisor == best_divisor)
				break;
		}
		if (i < mix->table_size)
			return _set_rate(mix,
					_get_mux_val(mix, item->parent_index),
					_get_div_val(mix, item->divisor),
					1, 1);
		else
			return -EINVAL;
	} else {
		for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
			parent = clk_hw_get_parent_by_index(hw, i);
			parent_rate = clk_hw_get_rate(parent);
			if (parent_rate == best_parent_rate)
				break;
		}
		if (i < clk_hw_get_num_parents(hw))
			return _set_rate(mix, _get_mux_val(mix, i),
					_get_div_val(mix, best_divisor), 1, 1);
		else
			return -EINVAL;
	}
}

static int mmp_clk_mix_init(struct clk_hw *hw)
{
	struct mmp_clk_mix *mix = to_clk_mix(hw);

	if (mix->table)
		_filter_clk_table(mix, mix->table, mix->table_size);

	return 0;
}

const struct clk_ops mmp_clk_mix_ops = {
	.determine_rate = mmp_clk_mix_determine_rate,
	.set_rate_and_parent = mmp_clk_mix_set_rate_and_parent,
	.set_rate = mmp_clk_set_rate,
	.set_parent = mmp_clk_set_parent,
	.get_parent = mmp_clk_mix_get_parent,
	.recalc_rate = mmp_clk_mix_recalc_rate,
	.init = mmp_clk_mix_init,
};

struct clk *mmp_clk_register_mix(struct device *dev,
					const char *name,
					const char **parent_names,
					u8 num_parents,
					unsigned long flags,
					struct mmp_clk_mix_config *config,
					spinlock_t *lock)
{
	struct mmp_clk_mix *mix;
	struct clk *clk;
	struct clk_init_data init;
	size_t table_bytes;

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

	init.name = name;
	init.flags = flags | CLK_GET_RATE_NOCACHE;
	init.parent_names = parent_names;
	init.num_parents = num_parents;
	init.ops = &mmp_clk_mix_ops;

	memcpy(&mix->reg_info, &config->reg_info, sizeof(config->reg_info));
	if (config->table) {
		table_bytes = sizeof(*config->table) * config->table_size;
		mix->table = kmemdup(config->table, table_bytes, GFP_KERNEL);
		if (!mix->table)
			goto free_mix;

		mix->table_size = config->table_size;
	}

	if (config->mux_table) {
		table_bytes = sizeof(u32) * num_parents;
		mix->mux_table = kmemdup(config->mux_table, table_bytes,
					 GFP_KERNEL);
		if (!mix->mux_table) {
			kfree(mix->table);
			goto free_mix;
		}
	}

	mix->div_flags = config->div_flags;
	mix->mux_flags = config->mux_flags;
	mix->lock = lock;
	mix->hw.init = &init;

	if (config->reg_info.bit_fc >= 32)
		mix->type = MMP_CLK_MIX_TYPE_V1;
	else if (config->reg_info.reg_clk_sel)
		mix->type = MMP_CLK_MIX_TYPE_V3;
	else
		mix->type = MMP_CLK_MIX_TYPE_V2;
	clk = clk_register(dev, &mix->hw);

	if (IS_ERR(clk)) {
		kfree(mix->mux_table);
		kfree(mix->table);
		kfree(mix);
	}

	return clk;

free_mix:
	kfree(mix);
	return ERR_PTR(-ENOMEM);
}