summaryrefslogtreecommitdiff
path: root/drivers/clk/qcom/common.c
blob: cfab7b400381ad467f39d9628930745f6345cce4 (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
/*
 * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/export.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/platform_device.h>
#include <linux/clk-provider.h>
#include <linux/reset-controller.h>
#include <linux/of.h>

#include "common.h"
#include "clk-rcg.h"
#include "clk-regmap.h"
#include "reset.h"
#include "gdsc.h"

struct qcom_cc {
	struct qcom_reset_controller reset;
	struct clk_regmap **rclks;
	size_t num_rclks;
};

const
struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate)
{
	if (!f)
		return NULL;

	for (; f->freq; f++)
		if (rate <= f->freq)
			return f;

	/* Default to our fastest rate */
	return f - 1;
}
EXPORT_SYMBOL_GPL(qcom_find_freq);

const struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f,
					    unsigned long rate)
{
	const struct freq_tbl *best = NULL;

	for ( ; f->freq; f++) {
		if (rate >= f->freq)
			best = f;
		else
			break;
	}

	return best;
}
EXPORT_SYMBOL_GPL(qcom_find_freq_floor);

int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src)
{
	int i, num_parents = clk_hw_get_num_parents(hw);

	for (i = 0; i < num_parents; i++)
		if (src == map[i].src)
			return i;

	return -ENOENT;
}
EXPORT_SYMBOL_GPL(qcom_find_src_index);

struct regmap *
qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
{
	void __iomem *base;
	struct resource *res;
	struct device *dev = &pdev->dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	base = devm_ioremap_resource(dev, res);
	if (IS_ERR(base))
		return ERR_CAST(base);

	return devm_regmap_init_mmio(dev, base, desc->config);
}
EXPORT_SYMBOL_GPL(qcom_cc_map);

void
qcom_pll_set_fsm_mode(struct regmap *map, u32 reg, u8 bias_count, u8 lock_count)
{
	u32 val;
	u32 mask;

	/* De-assert reset to FSM */
	regmap_update_bits(map, reg, PLL_VOTE_FSM_RESET, 0);

	/* Program bias count and lock count */
	val = bias_count << PLL_BIAS_COUNT_SHIFT |
		lock_count << PLL_LOCK_COUNT_SHIFT;
	mask = PLL_BIAS_COUNT_MASK << PLL_BIAS_COUNT_SHIFT;
	mask |= PLL_LOCK_COUNT_MASK << PLL_LOCK_COUNT_SHIFT;
	regmap_update_bits(map, reg, mask, val);

	/* Enable PLL FSM voting */
	regmap_update_bits(map, reg, PLL_VOTE_FSM_ENA, PLL_VOTE_FSM_ENA);
}
EXPORT_SYMBOL_GPL(qcom_pll_set_fsm_mode);

static void qcom_cc_del_clk_provider(void *data)
{
	of_clk_del_provider(data);
}

static void qcom_cc_reset_unregister(void *data)
{
	reset_controller_unregister(data);
}

static void qcom_cc_gdsc_unregister(void *data)
{
	gdsc_unregister(data);
}

/*
 * Backwards compatibility with old DTs. Register a pass-through factor 1/1
 * clock to translate 'path' clk into 'name' clk and regsiter the 'path'
 * clk as a fixed rate clock if it isn't present.
 */
static int _qcom_cc_register_board_clk(struct device *dev, const char *path,
				       const char *name, unsigned long rate,
				       bool add_factor)
{
	struct device_node *node = NULL;
	struct device_node *clocks_node;
	struct clk_fixed_factor *factor;
	struct clk_fixed_rate *fixed;
	struct clk_init_data init_data = { };
	int ret;

	clocks_node = of_find_node_by_path("/clocks");
	if (clocks_node)
		node = of_find_node_by_name(clocks_node, path);
	of_node_put(clocks_node);

	if (!node) {
		fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL);
		if (!fixed)
			return -EINVAL;

		fixed->fixed_rate = rate;
		fixed->hw.init = &init_data;

		init_data.name = path;
		init_data.ops = &clk_fixed_rate_ops;

		ret = devm_clk_hw_register(dev, &fixed->hw);
		if (ret)
			return ret;
	}
	of_node_put(node);

	if (add_factor) {
		factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL);
		if (!factor)
			return -EINVAL;

		factor->mult = factor->div = 1;
		factor->hw.init = &init_data;

		init_data.name = name;
		init_data.parent_names = &path;
		init_data.num_parents = 1;
		init_data.flags = 0;
		init_data.ops = &clk_fixed_factor_ops;

		ret = devm_clk_hw_register(dev, &factor->hw);
		if (ret)
			return ret;
	}

	return 0;
}

int qcom_cc_register_board_clk(struct device *dev, const char *path,
			       const char *name, unsigned long rate)
{
	bool add_factor = true;

	/*
	 * TODO: The RPM clock driver currently does not support the xo clock.
	 * When xo is added to the RPM clock driver, we should change this
	 * function to skip registration of xo factor clocks.
	 */

	return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor);
}
EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk);

int qcom_cc_register_sleep_clk(struct device *dev)
{
	return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src",
					   32768, true);
}
EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk);

static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec,
					 void *data)
{
	struct qcom_cc *cc = data;
	unsigned int idx = clkspec->args[0];

	if (idx >= cc->num_rclks) {
		pr_err("%s: invalid index %u\n", __func__, idx);
		return ERR_PTR(-EINVAL);
	}

	return cc->rclks[idx] ? &cc->rclks[idx]->hw : ERR_PTR(-ENOENT);
}

int qcom_cc_really_probe(struct platform_device *pdev,
			 const struct qcom_cc_desc *desc, struct regmap *regmap)
{
	int i, ret;
	struct device *dev = &pdev->dev;
	struct qcom_reset_controller *reset;
	struct qcom_cc *cc;
	struct gdsc_desc *scd;
	size_t num_clks = desc->num_clks;
	struct clk_regmap **rclks = desc->clks;

	cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL);
	if (!cc)
		return -ENOMEM;

	cc->rclks = rclks;
	cc->num_rclks = num_clks;

	for (i = 0; i < num_clks; i++) {
		if (!rclks[i])
			continue;

		ret = devm_clk_register_regmap(dev, rclks[i]);
		if (ret)
			return ret;
	}

	ret = of_clk_add_hw_provider(dev->of_node, qcom_cc_clk_hw_get, cc);
	if (ret)
		return ret;

	ret = devm_add_action_or_reset(dev, qcom_cc_del_clk_provider,
				       pdev->dev.of_node);

	if (ret)
		return ret;

	reset = &cc->reset;
	reset->rcdev.of_node = dev->of_node;
	reset->rcdev.ops = &qcom_reset_ops;
	reset->rcdev.owner = dev->driver->owner;
	reset->rcdev.nr_resets = desc->num_resets;
	reset->regmap = regmap;
	reset->reset_map = desc->resets;

	ret = reset_controller_register(&reset->rcdev);
	if (ret)
		return ret;

	ret = devm_add_action_or_reset(dev, qcom_cc_reset_unregister,
				       &reset->rcdev);

	if (ret)
		return ret;

	if (desc->gdscs && desc->num_gdscs) {
		scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL);
		if (!scd)
			return -ENOMEM;
		scd->dev = dev;
		scd->scs = desc->gdscs;
		scd->num = desc->num_gdscs;
		ret = gdsc_register(scd, &reset->rcdev, regmap);
		if (ret)
			return ret;
		ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister,
					       scd);
		if (ret)
			return ret;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(qcom_cc_really_probe);

int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
{
	struct regmap *regmap;

	regmap = qcom_cc_map(pdev, desc);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	return qcom_cc_really_probe(pdev, desc, regmap);
}
EXPORT_SYMBOL_GPL(qcom_cc_probe);

MODULE_LICENSE("GPL v2");