summaryrefslogtreecommitdiff
path: root/drivers/clk/clk-lochnagar.c
blob: 80944bf482e9a85e0957b6ccca600677926d44f6 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Lochnagar clock control
 *
 * Copyright (c) 2017-2018 Cirrus Logic, Inc. and
 *                         Cirrus Logic International Semiconductor Ltd.
 *
 * Author: Charles Keepax <ckeepax@opensource.cirrus.com>
 */

#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#include <linux/mfd/lochnagar1_regs.h>
#include <linux/mfd/lochnagar2_regs.h>

#include <dt-bindings/clock/lochnagar.h>

#define LOCHNAGAR_NUM_CLOCKS	(LOCHNAGAR_SPDIF_CLKOUT + 1)

struct lochnagar_clk {
	const char * const name;
	struct clk_hw hw;

	struct lochnagar_clk_priv *priv;

	u16 cfg_reg;
	u16 ena_mask;

	u16 src_reg;
	u16 src_mask;
};

struct lochnagar_clk_priv {
	struct device *dev;
	struct regmap *regmap;

	struct lochnagar_clk lclks[LOCHNAGAR_NUM_CLOCKS];
};

#define LN_PARENT(NAME) { .name = NAME, .fw_name = NAME }

static const struct clk_parent_data lochnagar1_clk_parents[] = {
	LN_PARENT("ln-none"),
	LN_PARENT("ln-spdif-mclk"),
	LN_PARENT("ln-psia1-mclk"),
	LN_PARENT("ln-psia2-mclk"),
	LN_PARENT("ln-cdc-clkout"),
	LN_PARENT("ln-dsp-clkout"),
	LN_PARENT("ln-pmic-32k"),
	LN_PARENT("ln-gf-mclk1"),
	LN_PARENT("ln-gf-mclk3"),
	LN_PARENT("ln-gf-mclk2"),
	LN_PARENT("ln-gf-mclk4"),
};

static const struct clk_parent_data lochnagar2_clk_parents[] = {
	LN_PARENT("ln-none"),
	LN_PARENT("ln-cdc-clkout"),
	LN_PARENT("ln-dsp-clkout"),
	LN_PARENT("ln-pmic-32k"),
	LN_PARENT("ln-spdif-mclk"),
	LN_PARENT("ln-clk-12m"),
	LN_PARENT("ln-clk-11m"),
	LN_PARENT("ln-clk-24m"),
	LN_PARENT("ln-clk-22m"),
	LN_PARENT("ln-clk-8m"),
	LN_PARENT("ln-usb-clk-24m"),
	LN_PARENT("ln-gf-mclk1"),
	LN_PARENT("ln-gf-mclk3"),
	LN_PARENT("ln-gf-mclk2"),
	LN_PARENT("ln-psia1-mclk"),
	LN_PARENT("ln-psia2-mclk"),
	LN_PARENT("ln-spdif-clkout"),
	LN_PARENT("ln-adat-mclk"),
	LN_PARENT("ln-usb-clk-12m"),
};

#define LN1_CLK(ID, NAME, REG) \
	[LOCHNAGAR_##ID] = { \
		.name = NAME, \
		.cfg_reg = LOCHNAGAR1_##REG, \
		.ena_mask = LOCHNAGAR1_##ID##_ENA_MASK, \
		.src_reg = LOCHNAGAR1_##ID##_SEL, \
		.src_mask = LOCHNAGAR1_SRC_MASK, \
	}

#define LN2_CLK(ID, NAME) \
	[LOCHNAGAR_##ID] = { \
		.name = NAME, \
		.cfg_reg = LOCHNAGAR2_##ID##_CTRL, \
		.src_reg = LOCHNAGAR2_##ID##_CTRL, \
		.ena_mask = LOCHNAGAR2_CLK_ENA_MASK, \
		.src_mask = LOCHNAGAR2_CLK_SRC_MASK, \
	}

static const struct lochnagar_clk lochnagar1_clks[LOCHNAGAR_NUM_CLOCKS] = {
	LN1_CLK(CDC_MCLK1,      "ln-cdc-mclk1",  CDC_AIF_CTRL2),
	LN1_CLK(CDC_MCLK2,      "ln-cdc-mclk2",  CDC_AIF_CTRL2),
	LN1_CLK(DSP_CLKIN,      "ln-dsp-clkin",  DSP_AIF),
	LN1_CLK(GF_CLKOUT1,     "ln-gf-clkout1", GF_AIF1),
};

static const struct lochnagar_clk lochnagar2_clks[LOCHNAGAR_NUM_CLOCKS] = {
	LN2_CLK(CDC_MCLK1,      "ln-cdc-mclk1"),
	LN2_CLK(CDC_MCLK2,      "ln-cdc-mclk2"),
	LN2_CLK(DSP_CLKIN,      "ln-dsp-clkin"),
	LN2_CLK(GF_CLKOUT1,     "ln-gf-clkout1"),
	LN2_CLK(GF_CLKOUT2,     "ln-gf-clkout2"),
	LN2_CLK(PSIA1_MCLK,     "ln-psia1-mclk"),
	LN2_CLK(PSIA2_MCLK,     "ln-psia2-mclk"),
	LN2_CLK(SPDIF_MCLK,     "ln-spdif-mclk"),
	LN2_CLK(ADAT_MCLK,      "ln-adat-mclk"),
	LN2_CLK(SOUNDCARD_MCLK, "ln-soundcard-mclk"),
};

struct lochnagar_config {
	const struct clk_parent_data *parents;
	int nparents;
	const struct lochnagar_clk *clks;
};

static const struct lochnagar_config lochnagar1_conf = {
	.parents = lochnagar1_clk_parents,
	.nparents = ARRAY_SIZE(lochnagar1_clk_parents),
	.clks = lochnagar1_clks,
};

static const struct lochnagar_config lochnagar2_conf = {
	.parents = lochnagar2_clk_parents,
	.nparents = ARRAY_SIZE(lochnagar2_clk_parents),
	.clks = lochnagar2_clks,
};

static inline struct lochnagar_clk *lochnagar_hw_to_lclk(struct clk_hw *hw)
{
	return container_of(hw, struct lochnagar_clk, hw);
}

static int lochnagar_clk_prepare(struct clk_hw *hw)
{
	struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw);
	struct lochnagar_clk_priv *priv = lclk->priv;
	struct regmap *regmap = priv->regmap;
	int ret;

	ret = regmap_update_bits(regmap, lclk->cfg_reg,
				 lclk->ena_mask, lclk->ena_mask);
	if (ret < 0)
		dev_dbg(priv->dev, "Failed to prepare %s: %d\n",
			lclk->name, ret);

	return ret;
}

static void lochnagar_clk_unprepare(struct clk_hw *hw)
{
	struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw);
	struct lochnagar_clk_priv *priv = lclk->priv;
	struct regmap *regmap = priv->regmap;
	int ret;

	ret = regmap_update_bits(regmap, lclk->cfg_reg, lclk->ena_mask, 0);
	if (ret < 0)
		dev_dbg(priv->dev, "Failed to unprepare %s: %d\n",
			lclk->name, ret);
}

static int lochnagar_clk_set_parent(struct clk_hw *hw, u8 index)
{
	struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw);
	struct lochnagar_clk_priv *priv = lclk->priv;
	struct regmap *regmap = priv->regmap;
	int ret;

	ret = regmap_update_bits(regmap, lclk->src_reg, lclk->src_mask, index);
	if (ret < 0)
		dev_dbg(priv->dev, "Failed to reparent %s: %d\n",
			lclk->name, ret);

	return ret;
}

static u8 lochnagar_clk_get_parent(struct clk_hw *hw)
{
	struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw);
	struct lochnagar_clk_priv *priv = lclk->priv;
	struct regmap *regmap = priv->regmap;
	unsigned int val;
	int ret;

	ret = regmap_read(regmap, lclk->src_reg, &val);
	if (ret < 0) {
		dev_dbg(priv->dev, "Failed to read parent of %s: %d\n",
			lclk->name, ret);
		return clk_hw_get_num_parents(hw);
	}

	val &= lclk->src_mask;

	return val;
}

static const struct clk_ops lochnagar_clk_ops = {
	.prepare = lochnagar_clk_prepare,
	.unprepare = lochnagar_clk_unprepare,
	.set_parent = lochnagar_clk_set_parent,
	.get_parent = lochnagar_clk_get_parent,
};

static struct clk_hw *
lochnagar_of_clk_hw_get(struct of_phandle_args *clkspec, void *data)
{
	struct lochnagar_clk_priv *priv = data;
	unsigned int idx = clkspec->args[0];

	if (idx >= ARRAY_SIZE(priv->lclks)) {
		dev_err(priv->dev, "Invalid index %u\n", idx);
		return ERR_PTR(-EINVAL);
	}

	return &priv->lclks[idx].hw;
}

static const struct of_device_id lochnagar_of_match[] = {
	{ .compatible = "cirrus,lochnagar1-clk", .data = &lochnagar1_conf },
	{ .compatible = "cirrus,lochnagar2-clk", .data = &lochnagar2_conf },
	{}
};
MODULE_DEVICE_TABLE(of, lochnagar_of_match);

static int lochnagar_clk_probe(struct platform_device *pdev)
{
	struct clk_init_data clk_init = {
		.ops = &lochnagar_clk_ops,
	};
	struct device *dev = &pdev->dev;
	struct lochnagar_clk_priv *priv;
	const struct of_device_id *of_id;
	struct lochnagar_clk *lclk;
	struct lochnagar_config *conf;
	int ret, i;

	of_id = of_match_device(lochnagar_of_match, dev);
	if (!of_id)
		return -EINVAL;

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

	priv->dev = dev;
	priv->regmap = dev_get_regmap(dev->parent, NULL);
	conf = (struct lochnagar_config *)of_id->data;

	memcpy(priv->lclks, conf->clks, sizeof(priv->lclks));

	clk_init.parent_data = conf->parents;
	clk_init.num_parents = conf->nparents;

	for (i = 0; i < ARRAY_SIZE(priv->lclks); i++) {
		lclk = &priv->lclks[i];

		if (!lclk->name)
			continue;

		clk_init.name = lclk->name;

		lclk->priv = priv;
		lclk->hw.init = &clk_init;

		ret = devm_clk_hw_register(dev, &lclk->hw);
		if (ret) {
			dev_err(dev, "Failed to register %s: %d\n",
				lclk->name, ret);
			return ret;
		}
	}

	ret = devm_of_clk_add_hw_provider(dev, lochnagar_of_clk_hw_get, priv);
	if (ret < 0)
		dev_err(dev, "Failed to register provider: %d\n", ret);

	return ret;
}

static struct platform_driver lochnagar_clk_driver = {
	.driver = {
		.name = "lochnagar-clk",
		.of_match_table = lochnagar_of_match,
	},
	.probe = lochnagar_clk_probe,
};
module_platform_driver(lochnagar_clk_driver);

MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>");
MODULE_DESCRIPTION("Clock driver for Cirrus Logic Lochnagar Board");
MODULE_LICENSE("GPL v2");