summaryrefslogtreecommitdiffstats
path: root/sound/soc/samsung/s3c24xx_uda134x.c
blob: 1b7b52b0af97c04da973153dc446a64379f29019 (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
/*
 * Modifications by Christian Pellegrin <chripell@evolware.org>
 *
 * s3c24xx_uda134x.c  --  S3C24XX_UDA134X ALSA SoC Audio board driver
 *
 * Copyright 2007 Dension Audio Systems Ltd.
 * Author: Zoltan Devai
 *
 * 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.
 */

#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/module.h>

#include <sound/soc.h>
#include <sound/s3c24xx_uda134x.h>

#include "regs-iis.h"

#include "s3c24xx-i2s.h"

/* #define ENFORCE_RATES 1 */
/*
  Unfortunately the S3C24XX in master mode has a limited capacity of
  generating the clock for the codec. If you define this only rates
  that are really available will be enforced. But be careful, most
  user level application just want the usual sampling frequencies (8,
  11.025, 22.050, 44.1 kHz) and anyway resampling is a costly
  operation for embedded systems. So if you aren't very lucky or your
  hardware engineer wasn't very forward-looking it's better to leave
  this undefined. If you do so an approximate value for the requested
  sampling rate in the range -/+ 5% will be chosen. If this in not
  possible an error will be returned.
*/

static struct clk *xtal;
static struct clk *pclk;
/* this is need because we don't have a place where to keep the
 * pointers to the clocks in each substream. We get the clocks only
 * when we are actually using them so we don't block stuff like
 * frequency change or oscillator power-off */
static int clk_users;
static DEFINE_MUTEX(clk_lock);

static unsigned int rates[33 * 2];
#ifdef ENFORCE_RATES
static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
	.count	= ARRAY_SIZE(rates),
	.list	= rates,
	.mask	= 0,
};
#endif

static struct platform_device *s3c24xx_uda134x_snd_device;

static int s3c24xx_uda134x_startup(struct snd_pcm_substream *substream)
{
	int ret = 0;
#ifdef ENFORCE_RATES
	struct snd_pcm_runtime *runtime = substream->runtime;
#endif

	mutex_lock(&clk_lock);
	pr_debug("%s %d\n", __func__, clk_users);
	if (clk_users == 0) {
		xtal = clk_get(&s3c24xx_uda134x_snd_device->dev, "xtal");
		if (IS_ERR(xtal)) {
			printk(KERN_ERR "%s cannot get xtal\n", __func__);
			ret = PTR_ERR(xtal);
		} else {
			pclk = clk_get(&s3c24xx_uda134x_snd_device->dev,
				       "pclk");
			if (IS_ERR(pclk)) {
				printk(KERN_ERR "%s cannot get pclk\n",
				       __func__);
				clk_put(xtal);
				ret = PTR_ERR(pclk);
			}
		}
		if (!ret) {
			int i, j;

			for (i = 0; i < 2; i++) {
				int fs = i ? 256 : 384;

				rates[i*33] = clk_get_rate(xtal) / fs;
				for (j = 1; j < 33; j++)
					rates[i*33 + j] = clk_get_rate(pclk) /
						(j * fs);
			}
		}
	}
	clk_users += 1;
	mutex_unlock(&clk_lock);
	if (!ret) {
#ifdef ENFORCE_RATES
		ret = snd_pcm_hw_constraint_list(runtime, 0,
						 SNDRV_PCM_HW_PARAM_RATE,
						 &hw_constraints_rates);
		if (ret < 0)
			printk(KERN_ERR "%s cannot set constraints\n",
			       __func__);
#endif
	}
	return ret;
}

static void s3c24xx_uda134x_shutdown(struct snd_pcm_substream *substream)
{
	mutex_lock(&clk_lock);
	pr_debug("%s %d\n", __func__, clk_users);
	clk_users -= 1;
	if (clk_users == 0) {
		clk_put(xtal);
		xtal = NULL;
		clk_put(pclk);
		pclk = NULL;
	}
	mutex_unlock(&clk_lock);
}

static int s3c24xx_uda134x_hw_params(struct snd_pcm_substream *substream,
					struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	unsigned int clk = 0;
	int ret = 0;
	int clk_source, fs_mode;
	unsigned long rate = params_rate(params);
	long err, cerr;
	unsigned int div;
	int i, bi;

	err = 999999;
	bi = 0;
	for (i = 0; i < 2*33; i++) {
		cerr = rates[i] - rate;
		if (cerr < 0)
			cerr = -cerr;
		if (cerr < err) {
			err = cerr;
			bi = i;
		}
	}
	if (bi / 33 == 1)
		fs_mode = S3C2410_IISMOD_256FS;
	else
		fs_mode = S3C2410_IISMOD_384FS;
	if (bi % 33 == 0) {
		clk_source = S3C24XX_CLKSRC_MPLL;
		div = 1;
	} else {
		clk_source = S3C24XX_CLKSRC_PCLK;
		div = bi % 33;
	}
	pr_debug("%s desired rate %lu, %d\n", __func__, rate, bi);

	clk = (fs_mode == S3C2410_IISMOD_384FS ? 384 : 256) * rate;
	pr_debug("%s will use: %s %s %d sysclk %d err %ld\n", __func__,
		 fs_mode == S3C2410_IISMOD_384FS ? "384FS" : "256FS",
		 clk_source == S3C24XX_CLKSRC_MPLL ? "MPLLin" : "PCLK",
		 div, clk, err);

	if ((err * 100 / rate) > 5) {
		printk(KERN_ERR "S3C24XX_UDA134X: effective frequency "
		       "too different from desired (%ld%%)\n",
		       err * 100 / rate);
		return -EINVAL;
	}

	ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
			SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
	if (ret < 0)
		return ret;

	ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
			SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
	if (ret < 0)
		return ret;

	ret = snd_soc_dai_set_sysclk(cpu_dai, clk_source , clk,
			SND_SOC_CLOCK_IN);
	if (ret < 0)
		return ret;

	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK, fs_mode);
	if (ret < 0)
		return ret;

	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_BCLK,
			S3C2410_IISMOD_32FS);
	if (ret < 0)
		return ret;

	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
			S3C24XX_PRESCALE(div, div));
	if (ret < 0)
		return ret;

	/* set the codec system clock for DAC and ADC */
	ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk,
			SND_SOC_CLOCK_OUT);
	if (ret < 0)
		return ret;

	return 0;
}

static struct snd_soc_ops s3c24xx_uda134x_ops = {
	.startup = s3c24xx_uda134x_startup,
	.shutdown = s3c24xx_uda134x_shutdown,
	.hw_params = s3c24xx_uda134x_hw_params,
};

static struct snd_soc_dai_link s3c24xx_uda134x_dai_link = {
	.name = "UDA134X",
	.stream_name = "UDA134X",
	.codec_name = "uda134x-codec",
	.codec_dai_name = "uda134x-hifi",
	.cpu_dai_name = "s3c24xx-iis",
	.ops = &s3c24xx_uda134x_ops,
	.platform_name	= "s3c24xx-iis",
};

static struct snd_soc_card snd_soc_s3c24xx_uda134x = {
	.name = "S3C24XX_UDA134X",
	.owner = THIS_MODULE,
	.dai_link = &s3c24xx_uda134x_dai_link,
	.num_links = 1,
};

static struct s3c24xx_uda134x_platform_data *s3c24xx_uda134x_l3_pins;

static void setdat(int v)
{
	gpio_set_value(s3c24xx_uda134x_l3_pins->l3_data, v > 0);
}

static void setclk(int v)
{
	gpio_set_value(s3c24xx_uda134x_l3_pins->l3_clk, v > 0);
}

static void setmode(int v)
{
	gpio_set_value(s3c24xx_uda134x_l3_pins->l3_mode, v > 0);
}

/* FIXME - This must be codec platform data but in which board file ?? */
static struct uda134x_platform_data s3c24xx_uda134x = {
	.l3 = {
		.setdat = setdat,
		.setclk = setclk,
		.setmode = setmode,
		.data_hold = 1,
		.data_setup = 1,
		.clock_high = 1,
		.mode_hold = 1,
		.mode = 1,
		.mode_setup = 1,
	},
};

static int s3c24xx_uda134x_setup_pin(int pin, char *fun)
{
	if (gpio_request(pin, "s3c24xx_uda134x") < 0) {
		printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
		       "l3 %s pin already in use", fun);
		return -EBUSY;
	}
	gpio_direction_output(pin, 0);
	return 0;
}

static int s3c24xx_uda134x_probe(struct platform_device *pdev)
{
	int ret;

	printk(KERN_INFO "S3C24XX_UDA134X SoC Audio driver\n");

	s3c24xx_uda134x_l3_pins = pdev->dev.platform_data;
	if (s3c24xx_uda134x_l3_pins == NULL) {
		printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
		       "unable to find platform data\n");
		return -ENODEV;
	}
	s3c24xx_uda134x.power = s3c24xx_uda134x_l3_pins->power;
	s3c24xx_uda134x.model = s3c24xx_uda134x_l3_pins->model;

	if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_data,
				      "data") < 0)
		return -EBUSY;
	if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_clk,
				      "clk") < 0) {
		gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
		return -EBUSY;
	}
	if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_mode,
				      "mode") < 0) {
		gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
		gpio_free(s3c24xx_uda134x_l3_pins->l3_clk);
		return -EBUSY;
	}

	s3c24xx_uda134x_snd_device = platform_device_alloc("soc-audio", -1);
	if (!s3c24xx_uda134x_snd_device) {
		printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: "
		       "Unable to register\n");
		return -ENOMEM;
	}

	platform_set_drvdata(s3c24xx_uda134x_snd_device,
			     &snd_soc_s3c24xx_uda134x);
	platform_device_add_data(s3c24xx_uda134x_snd_device, &s3c24xx_uda134x, sizeof(s3c24xx_uda134x));
	ret = platform_device_add(s3c24xx_uda134x_snd_device);
	if (ret) {
		printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: Unable to add\n");
		platform_device_put(s3c24xx_uda134x_snd_device);
	}

	return ret;
}

static int s3c24xx_uda134x_remove(struct platform_device *pdev)
{
	platform_device_unregister(s3c24xx_uda134x_snd_device);
	gpio_free(s3c24xx_uda134x_l3_pins->l3_data);
	gpio_free(s3c24xx_uda134x_l3_pins->l3_clk);
	gpio_free(s3c24xx_uda134x_l3_pins->l3_mode);
	return 0;
}

static struct platform_driver s3c24xx_uda134x_driver = {
	.probe  = s3c24xx_uda134x_probe,
	.remove = s3c24xx_uda134x_remove,
	.driver = {
		.name = "s3c24xx_uda134x",
		.owner = THIS_MODULE,
	},
};

module_platform_driver(s3c24xx_uda134x_driver);

MODULE_AUTHOR("Zoltan Devai, Christian Pellegrin <chripell@evolware.org>");
MODULE_DESCRIPTION("S3C24XX_UDA134X ALSA SoC audio driver");
MODULE_LICENSE("GPL");