summaryrefslogtreecommitdiffstats
path: root/drivers/clk/ti/clk.c
blob: b5bcd77e8d0f5e31b3887ebdd3a4f441c7909a46 (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
/*
 * TI clock support
 *
 * Copyright (C) 2013 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.h>
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/clk/ti.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/list.h>
#include <linux/regmap.h>
#include <linux/bootmem.h>

#include "clock.h"

#undef pr_fmt
#define pr_fmt(fmt) "%s: " fmt, __func__

struct ti_clk_ll_ops *ti_clk_ll_ops;
static struct device_node *clocks_node_ptr[CLK_MAX_MEMMAPS];

static struct ti_clk_features ti_clk_features;

struct clk_iomap {
	struct regmap *regmap;
	void __iomem *mem;
};

static struct clk_iomap *clk_memmaps[CLK_MAX_MEMMAPS];

static void clk_memmap_writel(u32 val, void __iomem *reg)
{
	struct clk_omap_reg *r = (struct clk_omap_reg *)&reg;
	struct clk_iomap *io = clk_memmaps[r->index];

	if (io->regmap)
		regmap_write(io->regmap, r->offset, val);
	else
		writel_relaxed(val, io->mem + r->offset);
}

static u32 clk_memmap_readl(void __iomem *reg)
{
	u32 val;
	struct clk_omap_reg *r = (struct clk_omap_reg *)&reg;
	struct clk_iomap *io = clk_memmaps[r->index];

	if (io->regmap)
		regmap_read(io->regmap, r->offset, &val);
	else
		val = readl_relaxed(io->mem + r->offset);

	return val;
}

/**
 * ti_clk_setup_ll_ops - setup low level clock operations
 * @ops: low level clock ops descriptor
 *
 * Sets up low level clock operations for TI clock driver. This is used
 * to provide various callbacks for the clock driver towards platform
 * specific code. Returns 0 on success, -EBUSY if ll_ops have been
 * registered already.
 */
int ti_clk_setup_ll_ops(struct ti_clk_ll_ops *ops)
{
	if (ti_clk_ll_ops) {
		pr_err("Attempt to register ll_ops multiple times.\n");
		return -EBUSY;
	}

	ti_clk_ll_ops = ops;
	ops->clk_readl = clk_memmap_readl;
	ops->clk_writel = clk_memmap_writel;

	return 0;
}

/**
 * ti_dt_clocks_register - register DT alias clocks during boot
 * @oclks: list of clocks to register
 *
 * Register alias or non-standard DT clock entries during boot. By
 * default, DT clocks are found based on their node name. If any
 * additional con-id / dev-id -> clock mapping is required, use this
 * function to list these.
 */
void __init ti_dt_clocks_register(struct ti_dt_clk oclks[])
{
	struct ti_dt_clk *c;
	struct device_node *node;
	struct clk *clk;
	struct of_phandle_args clkspec;

	for (c = oclks; c->node_name != NULL; c++) {
		node = of_find_node_by_name(NULL, c->node_name);
		clkspec.np = node;
		clk = of_clk_get_from_provider(&clkspec);

		if (!IS_ERR(clk)) {
			c->lk.clk = clk;
			clkdev_add(&c->lk);
		} else {
			pr_warn("failed to lookup clock node %s\n",
				c->node_name);
		}
	}
}

struct clk_init_item {
	struct device_node *node;
	struct clk_hw *hw;
	ti_of_clk_init_cb_t func;
	struct list_head link;
};

static LIST_HEAD(retry_list);

/**
 * ti_clk_retry_init - retries a failed clock init at later phase
 * @node: device not for the clock
 * @hw: partially initialized clk_hw struct for the clock
 * @func: init function to be called for the clock
 *
 * Adds a failed clock init to the retry list. The retry list is parsed
 * once all the other clocks have been initialized.
 */
int __init ti_clk_retry_init(struct device_node *node, struct clk_hw *hw,
			      ti_of_clk_init_cb_t func)
{
	struct clk_init_item *retry;

	pr_debug("%s: adding to retry list...\n", node->name);
	retry = kzalloc(sizeof(*retry), GFP_KERNEL);
	if (!retry)
		return -ENOMEM;

	retry->node = node;
	retry->func = func;
	retry->hw = hw;
	list_add(&retry->link, &retry_list);

	return 0;
}

/**
 * ti_clk_get_reg_addr - get register address for a clock register
 * @node: device node for the clock
 * @index: register index from the clock node
 *
 * Builds clock register address from device tree information. This
 * is a struct of type clk_omap_reg. Returns a pointer to the register
 * address, or a pointer error value in failure.
 */
void __iomem *ti_clk_get_reg_addr(struct device_node *node, int index)
{
	struct clk_omap_reg *reg;
	u32 val;
	u32 tmp;
	int i;

	reg = (struct clk_omap_reg *)&tmp;

	for (i = 0; i < CLK_MAX_MEMMAPS; i++) {
		if (clocks_node_ptr[i] == node->parent)
			break;
	}

	if (i == CLK_MAX_MEMMAPS) {
		pr_err("clk-provider not found for %s!\n", node->name);
		return IOMEM_ERR_PTR(-ENOENT);
	}

	reg->index = i;

	if (of_property_read_u32_index(node, "reg", index, &val)) {
		pr_err("%s must have reg[%d]!\n", node->name, index);
		return IOMEM_ERR_PTR(-EINVAL);
	}

	reg->offset = val;

	return (__force void __iomem *)tmp;
}

/**
 * omap2_clk_provider_init - init master clock provider
 * @parent: master node
 * @index: internal index for clk_reg_ops
 * @syscon: syscon regmap pointer for accessing clock registers
 * @mem: iomem pointer for the clock provider memory area, only used if
 *       syscon is not provided
 *
 * Initializes a master clock IP block. This basically sets up the
 * mapping from clocks node to the memory map index. All the clocks
 * are then initialized through the common of_clk_init call, and the
 * clocks will access their memory maps based on the node layout.
 * Returns 0 in success.
 */
int __init omap2_clk_provider_init(struct device_node *parent, int index,
				   struct regmap *syscon, void __iomem *mem)
{
	struct device_node *clocks;
	struct clk_iomap *io;

	/* get clocks for this parent */
	clocks = of_get_child_by_name(parent, "clocks");
	if (!clocks) {
		pr_err("%s missing 'clocks' child node.\n", parent->name);
		return -EINVAL;
	}

	/* add clocks node info */
	clocks_node_ptr[index] = clocks;

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

	io->regmap = syscon;
	io->mem = mem;

	clk_memmaps[index] = io;

	return 0;
}

/**
 * omap2_clk_legacy_provider_init - initialize a legacy clock provider
 * @index: index for the clock provider
 * @mem: iomem pointer for the clock provider memory area
 *
 * Initializes a legacy clock provider memory mapping.
 */
void __init omap2_clk_legacy_provider_init(int index, void __iomem *mem)
{
	struct clk_iomap *io;

	io = memblock_virt_alloc(sizeof(*io), 0);

	io->mem = mem;

	clk_memmaps[index] = io;
}

/**
 * ti_dt_clk_init_retry_clks - init clocks from the retry list
 *
 * Initializes any clocks that have failed to initialize before,
 * reasons being missing parent node(s) during earlier init. This
 * typically happens only for DPLLs which need to have both of their
 * parent clocks ready during init.
 */
void ti_dt_clk_init_retry_clks(void)
{
	struct clk_init_item *retry;
	struct clk_init_item *tmp;
	int retries = 5;

	while (!list_empty(&retry_list) && retries) {
		list_for_each_entry_safe(retry, tmp, &retry_list, link) {
			pr_debug("retry-init: %s\n", retry->node->name);
			retry->func(retry->hw, retry->node);
			list_del(&retry->link);
			kfree(retry);
		}
		retries--;
	}
}

#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_ATAGS)
void __init ti_clk_patch_legacy_clks(struct ti_clk **patch)
{
	while (*patch) {
		memcpy((*patch)->patch, *patch, sizeof(**patch));
		patch++;
	}
}

struct clk __init *ti_clk_register_clk(struct ti_clk *setup)
{
	struct clk *clk;
	struct ti_clk_fixed *fixed;
	struct ti_clk_fixed_factor *fixed_factor;
	struct clk_hw *clk_hw;

	if (setup->clk)
		return setup->clk;

	switch (setup->type) {
	case TI_CLK_FIXED:
		fixed = setup->data;

		clk = clk_register_fixed_rate(NULL, setup->name, NULL,
					      CLK_IS_ROOT, fixed->frequency);
		break;
	case TI_CLK_MUX:
		clk = ti_clk_register_mux(setup);
		break;
	case TI_CLK_DIVIDER:
		clk = ti_clk_register_divider(setup);
		break;
	case TI_CLK_COMPOSITE:
		clk = ti_clk_register_composite(setup);
		break;
	case TI_CLK_FIXED_FACTOR:
		fixed_factor = setup->data;

		clk = clk_register_fixed_factor(NULL, setup->name,
						fixed_factor->parent,
						0, fixed_factor->mult,
						fixed_factor->div);
		break;
	case TI_CLK_GATE:
		clk = ti_clk_register_gate(setup);
		break;
	case TI_CLK_DPLL:
		clk = ti_clk_register_dpll(setup);
		break;
	default:
		pr_err("bad type for %s!\n", setup->name);
		clk = ERR_PTR(-EINVAL);
	}

	if (!IS_ERR(clk)) {
		setup->clk = clk;
		if (setup->clkdm_name) {
			clk_hw = __clk_get_hw(clk);
			if (clk_hw_get_flags(clk_hw) & CLK_IS_BASIC) {
				pr_warn("can't setup clkdm for basic clk %s\n",
					setup->name);
			} else {
				to_clk_hw_omap(clk_hw)->clkdm_name =
					setup->clkdm_name;
				omap2_init_clk_clkdm(clk_hw);
			}
		}
	}

	return clk;
}

int __init ti_clk_register_legacy_clks(struct ti_clk_alias *clks)
{
	struct clk *clk;
	bool retry;
	struct ti_clk_alias *retry_clk;
	struct ti_clk_alias *tmp;

	while (clks->clk) {
		clk = ti_clk_register_clk(clks->clk);
		if (IS_ERR(clk)) {
			if (PTR_ERR(clk) == -EAGAIN) {
				list_add(&clks->link, &retry_list);
			} else {
				pr_err("register for %s failed: %ld\n",
				       clks->clk->name, PTR_ERR(clk));
				return PTR_ERR(clk);
			}
		} else {
			clks->lk.clk = clk;
			clkdev_add(&clks->lk);
		}
		clks++;
	}

	retry = true;

	while (!list_empty(&retry_list) && retry) {
		retry = false;
		list_for_each_entry_safe(retry_clk, tmp, &retry_list, link) {
			pr_debug("retry-init: %s\n", retry_clk->clk->name);
			clk = ti_clk_register_clk(retry_clk->clk);
			if (IS_ERR(clk)) {
				if (PTR_ERR(clk) == -EAGAIN) {
					continue;
				} else {
					pr_err("register for %s failed: %ld\n",
					       retry_clk->clk->name,
					       PTR_ERR(clk));
					return PTR_ERR(clk);
				}
			} else {
				retry = true;
				retry_clk->lk.clk = clk;
				clkdev_add(&retry_clk->lk);
				list_del(&retry_clk->link);
			}
		}
	}

	return 0;
}
#endif

/**
 * ti_clk_setup_features - setup clock features flags
 * @features: features definition to use
 *
 * Initializes the clock driver features flags based on platform
 * provided data. No return value.
 */
void __init ti_clk_setup_features(struct ti_clk_features *features)
{
	memcpy(&ti_clk_features, features, sizeof(*features));
}

/**
 * ti_clk_get_features - get clock driver features flags
 *
 * Get TI clock driver features description. Returns a pointer
 * to the current feature setup.
 */
const struct ti_clk_features *ti_clk_get_features(void)
{
	return &ti_clk_features;
}

/**
 * omap2_clk_enable_init_clocks - prepare & enable a list of clocks
 * @clk_names: ptr to an array of strings of clock names to enable
 * @num_clocks: number of clock names in @clk_names
 *
 * Prepare and enable a list of clocks, named by @clk_names.  No
 * return value. XXX Deprecated; only needed until these clocks are
 * properly claimed and enabled by the drivers or core code that uses
 * them.  XXX What code disables & calls clk_put on these clocks?
 */
void omap2_clk_enable_init_clocks(const char **clk_names, u8 num_clocks)
{
	struct clk *init_clk;
	int i;

	for (i = 0; i < num_clocks; i++) {
		init_clk = clk_get(NULL, clk_names[i]);
		if (WARN(IS_ERR(init_clk), "could not find init clock %s\n",
			 clk_names[i]))
			continue;
		clk_prepare_enable(init_clk);
	}
}