summaryrefslogtreecommitdiffstats
path: root/drivers/clk/ti/clkctrl.c
blob: 53e71d0503ecc4fe436c5b18cf0a7c488507907d (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
/*
 * OMAP clkctrl clock support
 *
 * Copyright (C) 2017 Texas Instruments, Inc.
 *
 * Tero Kristo <t-kristo@ti.com>
 *
 * 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 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/clk-provider.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/clk/ti.h>
#include <linux/delay.h>
#include "clock.h"

#define NO_IDLEST			0x1

#define OMAP4_MODULEMODE_MASK		0x3

#define MODULEMODE_HWCTRL		0x1
#define MODULEMODE_SWCTRL		0x2

#define OMAP4_IDLEST_MASK		(0x3 << 16)
#define OMAP4_IDLEST_SHIFT		16

#define CLKCTRL_IDLEST_FUNCTIONAL	0x0
#define CLKCTRL_IDLEST_INTERFACE_IDLE	0x2
#define CLKCTRL_IDLEST_DISABLED		0x3

/* These timeouts are in us */
#define OMAP4_MAX_MODULE_READY_TIME	2000
#define OMAP4_MAX_MODULE_DISABLE_TIME	5000

static bool _early_timeout = true;

struct omap_clkctrl_provider {
	void __iomem *base;
	struct list_head clocks;
};

struct omap_clkctrl_clk {
	struct clk_hw *clk;
	u16 reg_offset;
	int bit_offset;
	struct list_head node;
};

union omap4_timeout {
	u32 cycles;
	ktime_t start;
};

static const struct omap_clkctrl_data default_clkctrl_data[] __initconst = {
	{ 0 },
};

static u32 _omap4_idlest(u32 val)
{
	val &= OMAP4_IDLEST_MASK;
	val >>= OMAP4_IDLEST_SHIFT;

	return val;
}

static bool _omap4_is_idle(u32 val)
{
	val = _omap4_idlest(val);

	return val == CLKCTRL_IDLEST_DISABLED;
}

static bool _omap4_is_ready(u32 val)
{
	val = _omap4_idlest(val);

	return val == CLKCTRL_IDLEST_FUNCTIONAL ||
	       val == CLKCTRL_IDLEST_INTERFACE_IDLE;
}

static bool _omap4_is_timeout(union omap4_timeout *time, u32 timeout)
{
	if (unlikely(_early_timeout)) {
		if (time->cycles++ < timeout) {
			udelay(1);
			return false;
		}
	} else {
		if (!ktime_to_ns(time->start)) {
			time->start = ktime_get();
			return false;
		}

		if (ktime_us_delta(ktime_get(), time->start) < timeout) {
			cpu_relax();
			return false;
		}
	}

	return true;
}

static int __init _omap4_disable_early_timeout(void)
{
	_early_timeout = false;

	return 0;
}
arch_initcall(_omap4_disable_early_timeout);

static int _omap4_clkctrl_clk_enable(struct clk_hw *hw)
{
	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	u32 val;
	int ret;
	union omap4_timeout timeout = { 0 };

	if (!clk->enable_bit)
		return 0;

	if (clk->clkdm) {
		ret = ti_clk_ll_ops->clkdm_clk_enable(clk->clkdm, hw->clk);
		if (ret) {
			WARN(1,
			     "%s: could not enable %s's clockdomain %s: %d\n",
			     __func__, clk_hw_get_name(hw),
			     clk->clkdm_name, ret);
			return ret;
		}
	}

	val = ti_clk_ll_ops->clk_readl(&clk->enable_reg);

	val &= ~OMAP4_MODULEMODE_MASK;
	val |= clk->enable_bit;

	ti_clk_ll_ops->clk_writel(val, &clk->enable_reg);

	if (clk->flags & NO_IDLEST)
		return 0;

	/* Wait until module is enabled */
	while (!_omap4_is_ready(ti_clk_ll_ops->clk_readl(&clk->enable_reg))) {
		if (_omap4_is_timeout(&timeout, OMAP4_MAX_MODULE_READY_TIME)) {
			pr_err("%s: failed to enable\n", clk_hw_get_name(hw));
			return -EBUSY;
		}
	}

	return 0;
}

static void _omap4_clkctrl_clk_disable(struct clk_hw *hw)
{
	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	u32 val;
	union omap4_timeout timeout = { 0 };

	if (!clk->enable_bit)
		return;

	val = ti_clk_ll_ops->clk_readl(&clk->enable_reg);

	val &= ~OMAP4_MODULEMODE_MASK;

	ti_clk_ll_ops->clk_writel(val, &clk->enable_reg);

	if (clk->flags & NO_IDLEST)
		goto exit;

	/* Wait until module is disabled */
	while (!_omap4_is_idle(ti_clk_ll_ops->clk_readl(&clk->enable_reg))) {
		if (_omap4_is_timeout(&timeout,
				      OMAP4_MAX_MODULE_DISABLE_TIME)) {
			pr_err("%s: failed to disable\n", clk_hw_get_name(hw));
			break;
		}
	}

exit:
	if (clk->clkdm)
		ti_clk_ll_ops->clkdm_clk_disable(clk->clkdm, hw->clk);
}

static int _omap4_clkctrl_clk_is_enabled(struct clk_hw *hw)
{
	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	u32 val;

	val = ti_clk_ll_ops->clk_readl(&clk->enable_reg);

	if (val & clk->enable_bit)
		return 1;

	return 0;
}

static const struct clk_ops omap4_clkctrl_clk_ops = {
	.enable		= _omap4_clkctrl_clk_enable,
	.disable	= _omap4_clkctrl_clk_disable,
	.is_enabled	= _omap4_clkctrl_clk_is_enabled,
};

static struct clk_hw *_ti_omap4_clkctrl_xlate(struct of_phandle_args *clkspec,
					      void *data)
{
	struct omap_clkctrl_provider *provider = data;
	struct omap_clkctrl_clk *entry;

	if (clkspec->args_count != 2)
		return ERR_PTR(-EINVAL);

	pr_debug("%s: looking for %x:%x\n", __func__,
		 clkspec->args[0], clkspec->args[1]);

	list_for_each_entry(entry, &provider->clocks, node) {
		if (entry->reg_offset == clkspec->args[0] &&
		    entry->bit_offset == clkspec->args[1])
			break;
	}

	if (!entry)
		return ERR_PTR(-EINVAL);

	return entry->clk;
}

static int __init
_ti_clkctrl_clk_register(struct omap_clkctrl_provider *provider,
			 struct device_node *node, struct clk_hw *clk_hw,
			 u16 offset, u8 bit, const char * const *parents,
			 int num_parents, const struct clk_ops *ops)
{
	struct clk_init_data init = { NULL };
	struct clk *clk;
	struct omap_clkctrl_clk *clkctrl_clk;
	int ret = 0;

	init.name = kasprintf(GFP_KERNEL, "%s:%s:%04x:%d", node->parent->name,
			      node->name, offset, bit);
	clkctrl_clk = kzalloc(sizeof(*clkctrl_clk), GFP_KERNEL);
	if (!init.name || !clkctrl_clk) {
		ret = -ENOMEM;
		goto cleanup;
	}

	clk_hw->init = &init;
	init.parent_names = parents;
	init.num_parents = num_parents;
	init.ops = ops;
	init.flags = CLK_IS_BASIC;

	clk = ti_clk_register(NULL, clk_hw, init.name);
	if (IS_ERR_OR_NULL(clk)) {
		ret = -EINVAL;
		goto cleanup;
	}

	clkctrl_clk->reg_offset = offset;
	clkctrl_clk->bit_offset = bit;
	clkctrl_clk->clk = clk_hw;

	list_add(&clkctrl_clk->node, &provider->clocks);

	return 0;

cleanup:
	kfree(init.name);
	kfree(clkctrl_clk);
	return ret;
}

static void __init
_ti_clkctrl_setup_gate(struct omap_clkctrl_provider *provider,
		       struct device_node *node, u16 offset,
		       const struct omap_clkctrl_bit_data *data,
		       void __iomem *reg)
{
	struct clk_hw_omap *clk_hw;

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

	clk_hw->enable_bit = data->bit;
	clk_hw->enable_reg.ptr = reg;

	if (_ti_clkctrl_clk_register(provider, node, &clk_hw->hw, offset,
				     data->bit, data->parents, 1,
				     &omap_gate_clk_ops))
		kfree(clk_hw);
}

static void __init
_ti_clkctrl_setup_mux(struct omap_clkctrl_provider *provider,
		      struct device_node *node, u16 offset,
		      const struct omap_clkctrl_bit_data *data,
		      void __iomem *reg)
{
	struct clk_omap_mux *mux;
	int num_parents = 0;
	const char * const *pname;

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

	pname = data->parents;
	while (*pname) {
		num_parents++;
		pname++;
	}

	mux->mask = num_parents;
	mux->mask = (1 << fls(mux->mask)) - 1;

	mux->shift = data->bit;
	mux->reg.ptr = reg;

	if (_ti_clkctrl_clk_register(provider, node, &mux->hw, offset,
				     data->bit, data->parents, num_parents,
				     &ti_clk_mux_ops))
		kfree(mux);
}

static void __init
_ti_clkctrl_setup_div(struct omap_clkctrl_provider *provider,
		      struct device_node *node, u16 offset,
		      const struct omap_clkctrl_bit_data *data,
		      void __iomem *reg)
{
	struct clk_omap_divider *div;
	const struct omap_clkctrl_div_data *div_data = data->data;

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

	div->reg.ptr = reg;
	div->shift = data->bit;

	if (ti_clk_parse_divider_data((int *)div_data->dividers,
				      div_data->max_div, 0, 0,
				      &div->width, &div->table)) {
		pr_err("%s: Data parsing for %s:%04x:%d failed\n", __func__,
		       node->name, offset, data->bit);
		kfree(div);
		return;
	}

	if (_ti_clkctrl_clk_register(provider, node, &div->hw, offset,
				     data->bit, data->parents, 1,
				     &ti_clk_divider_ops))
		kfree(div);
}

static void __init
_ti_clkctrl_setup_subclks(struct omap_clkctrl_provider *provider,
			  struct device_node *node,
			  const struct omap_clkctrl_reg_data *data,
			  void __iomem *reg)
{
	const struct omap_clkctrl_bit_data *bits = data->bit_data;

	if (!bits)
		return;

	while (bits->bit) {
		switch (bits->type) {
		case TI_CLK_GATE:
			_ti_clkctrl_setup_gate(provider, node, data->offset,
					       bits, reg);
			break;

		case TI_CLK_DIVIDER:
			_ti_clkctrl_setup_div(provider, node, data->offset,
					      bits, reg);
			break;

		case TI_CLK_MUX:
			_ti_clkctrl_setup_mux(provider, node, data->offset,
					      bits, reg);
			break;

		default:
			pr_err("%s: bad subclk type: %d\n", __func__,
			       bits->type);
			return;
		}
		bits++;
	}
}

static void __init _ti_omap4_clkctrl_setup(struct device_node *node)
{
	struct omap_clkctrl_provider *provider;
	const struct omap_clkctrl_data *data = default_clkctrl_data;
	const struct omap_clkctrl_reg_data *reg_data;
	struct clk_init_data init = { NULL };
	struct clk_hw_omap *hw;
	struct clk *clk;
	struct omap_clkctrl_clk *clkctrl_clk;
	const __be32 *addrp;
	u32 addr;

	addrp = of_get_address(node, 0, NULL, NULL);
	addr = (u32)of_translate_address(node, addrp);

#ifdef CONFIG_ARCH_OMAP4
	if (of_machine_is_compatible("ti,omap4"))
		data = omap4_clkctrl_data;
#endif

	while (data->addr) {
		if (addr == data->addr)
			break;

		data++;
	}

	if (!data->addr) {
		pr_err("%s not found from clkctrl data.\n", node->name);
		return;
	}

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

	provider->base = of_iomap(node, 0);

	INIT_LIST_HEAD(&provider->clocks);

	/* Generate clocks */
	reg_data = data->regs;

	while (reg_data->parent) {
		hw = kzalloc(sizeof(*hw), GFP_KERNEL);
		if (!hw)
			return;

		hw->enable_reg.ptr = provider->base + reg_data->offset;

		_ti_clkctrl_setup_subclks(provider, node, reg_data,
					  hw->enable_reg.ptr);

		if (reg_data->flags & CLKF_SW_SUP)
			hw->enable_bit = MODULEMODE_SWCTRL;
		if (reg_data->flags & CLKF_HW_SUP)
			hw->enable_bit = MODULEMODE_HWCTRL;
		if (reg_data->flags & CLKF_NO_IDLEST)
			hw->flags |= NO_IDLEST;

		init.parent_names = &reg_data->parent;
		init.num_parents = 1;
		init.flags = 0;
		init.name = kasprintf(GFP_KERNEL, "%s:%s:%04x:%d",
				      node->parent->name, node->name,
				      reg_data->offset, 0);
		clkctrl_clk = kzalloc(sizeof(*clkctrl_clk), GFP_KERNEL);
		if (!init.name || !clkctrl_clk)
			goto cleanup;

		init.ops = &omap4_clkctrl_clk_ops;
		hw->hw.init = &init;

		clk = ti_clk_register(NULL, &hw->hw, init.name);
		if (IS_ERR_OR_NULL(clk))
			goto cleanup;

		clkctrl_clk->reg_offset = reg_data->offset;
		clkctrl_clk->clk = &hw->hw;

		list_add(&clkctrl_clk->node, &provider->clocks);

		reg_data++;
	}

	of_clk_add_hw_provider(node, _ti_omap4_clkctrl_xlate, provider);
	return;

cleanup:
	kfree(hw);
	kfree(init.name);
	kfree(clkctrl_clk);
}
CLK_OF_DECLARE(ti_omap4_clkctrl_clock, "ti,clkctrl",
	       _ti_omap4_clkctrl_setup);
OpenPOWER on IntegriCloud