Commit | Line | Data |
---|---|---|
7ad933d7 CP |
1 | /* |
2 | * Modifications by Christian Pellegrin <chripell@evolware.org> | |
3 | * | |
4 | * s3c24xx_uda134x.c -- S3C24XX_UDA134X ALSA SoC Audio board driver | |
5 | * | |
6 | * Copyright 2007 Dension Audio Systems Ltd. | |
7 | * Author: Zoltan Devai | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
7ad933d7 | 14 | #include <linux/clk.h> |
7ad933d7 | 15 | #include <linux/gpio.h> |
da155d5b | 16 | #include <linux/module.h> |
0378b6ac | 17 | |
7ad933d7 | 18 | #include <sound/soc.h> |
7ad933d7 | 19 | #include <sound/s3c24xx_uda134x.h> |
7ad933d7 | 20 | |
5d229ce5 | 21 | #include "regs-iis.h" |
7ad933d7 | 22 | |
7ad933d7 | 23 | #include "s3c24xx-i2s.h" |
7ad933d7 CP |
24 | |
25 | /* #define ENFORCE_RATES 1 */ | |
26 | /* | |
27 | Unfortunately the S3C24XX in master mode has a limited capacity of | |
28 | generating the clock for the codec. If you define this only rates | |
29 | that are really available will be enforced. But be careful, most | |
30 | user level application just want the usual sampling frequencies (8, | |
31 | 11.025, 22.050, 44.1 kHz) and anyway resampling is a costly | |
32 | operation for embedded systems. So if you aren't very lucky or your | |
33 | hardware engineer wasn't very forward-looking it's better to leave | |
34 | this undefined. If you do so an approximate value for the requested | |
35 | sampling rate in the range -/+ 5% will be chosen. If this in not | |
36 | possible an error will be returned. | |
37 | */ | |
38 | ||
39 | static struct clk *xtal; | |
40 | static struct clk *pclk; | |
41 | /* this is need because we don't have a place where to keep the | |
42 | * pointers to the clocks in each substream. We get the clocks only | |
43 | * when we are actually using them so we don't block stuff like | |
44 | * frequency change or oscillator power-off */ | |
45 | static int clk_users; | |
46 | static DEFINE_MUTEX(clk_lock); | |
47 | ||
48 | static unsigned int rates[33 * 2]; | |
49 | #ifdef ENFORCE_RATES | |
50 | static struct snd_pcm_hw_constraint_list hw_constraints_rates = { | |
51 | .count = ARRAY_SIZE(rates), | |
52 | .list = rates, | |
53 | .mask = 0, | |
54 | }; | |
55 | #endif | |
56 | ||
d0c36631 | 57 | static int s3c24xx_uda134x_startup(struct snd_pcm_substream *substream) |
7ad933d7 | 58 | { |
1bc610e7 SN |
59 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
60 | struct snd_soc_dai *cpu_dai = rtd->cpu_dai; | |
7ad933d7 | 61 | #ifdef ENFORCE_RATES |
a419aef8 | 62 | struct snd_pcm_runtime *runtime = substream->runtime; |
7ad933d7 | 63 | #endif |
1bc610e7 | 64 | int ret = 0; |
7ad933d7 CP |
65 | |
66 | mutex_lock(&clk_lock); | |
45ef4969 | 67 | |
7ad933d7 | 68 | if (clk_users == 0) { |
28405212 | 69 | xtal = clk_get(rtd->dev, "xtal"); |
7803e329 | 70 | if (IS_ERR(xtal)) { |
45ef4969 | 71 | dev_err(rtd->dev, "%s cannot get xtal\n", __func__); |
7803e329 | 72 | ret = PTR_ERR(xtal); |
7ad933d7 | 73 | } else { |
1bc610e7 | 74 | pclk = clk_get(cpu_dai->dev, "iis"); |
7803e329 | 75 | if (IS_ERR(pclk)) { |
45ef4969 SN |
76 | dev_err(rtd->dev, "%s cannot get pclk\n", |
77 | __func__); | |
7ad933d7 | 78 | clk_put(xtal); |
7803e329 | 79 | ret = PTR_ERR(pclk); |
7ad933d7 CP |
80 | } |
81 | } | |
82 | if (!ret) { | |
83 | int i, j; | |
84 | ||
85 | for (i = 0; i < 2; i++) { | |
86 | int fs = i ? 256 : 384; | |
87 | ||
88 | rates[i*33] = clk_get_rate(xtal) / fs; | |
89 | for (j = 1; j < 33; j++) | |
90 | rates[i*33 + j] = clk_get_rate(pclk) / | |
91 | (j * fs); | |
92 | } | |
93 | } | |
94 | } | |
95 | clk_users += 1; | |
96 | mutex_unlock(&clk_lock); | |
97 | if (!ret) { | |
98 | #ifdef ENFORCE_RATES | |
99 | ret = snd_pcm_hw_constraint_list(runtime, 0, | |
100 | SNDRV_PCM_HW_PARAM_RATE, | |
101 | &hw_constraints_rates); | |
102 | if (ret < 0) | |
45ef4969 SN |
103 | dev_err(rtd->dev, "%s cannot set constraints\n", |
104 | __func__); | |
7ad933d7 CP |
105 | #endif |
106 | } | |
107 | return ret; | |
108 | } | |
109 | ||
d0c36631 | 110 | static void s3c24xx_uda134x_shutdown(struct snd_pcm_substream *substream) |
7ad933d7 CP |
111 | { |
112 | mutex_lock(&clk_lock); | |
7ad933d7 CP |
113 | clk_users -= 1; |
114 | if (clk_users == 0) { | |
115 | clk_put(xtal); | |
116 | xtal = NULL; | |
117 | clk_put(pclk); | |
118 | pclk = NULL; | |
119 | } | |
120 | mutex_unlock(&clk_lock); | |
121 | } | |
122 | ||
123 | static int s3c24xx_uda134x_hw_params(struct snd_pcm_substream *substream, | |
124 | struct snd_pcm_hw_params *params) | |
125 | { | |
126 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
f0fba2ad LG |
127 | struct snd_soc_dai *codec_dai = rtd->codec_dai; |
128 | struct snd_soc_dai *cpu_dai = rtd->cpu_dai; | |
7ad933d7 CP |
129 | unsigned int clk = 0; |
130 | int ret = 0; | |
131 | int clk_source, fs_mode; | |
132 | unsigned long rate = params_rate(params); | |
133 | long err, cerr; | |
134 | unsigned int div; | |
135 | int i, bi; | |
136 | ||
137 | err = 999999; | |
138 | bi = 0; | |
139 | for (i = 0; i < 2*33; i++) { | |
140 | cerr = rates[i] - rate; | |
141 | if (cerr < 0) | |
142 | cerr = -cerr; | |
143 | if (cerr < err) { | |
144 | err = cerr; | |
145 | bi = i; | |
146 | } | |
147 | } | |
148 | if (bi / 33 == 1) | |
149 | fs_mode = S3C2410_IISMOD_256FS; | |
150 | else | |
151 | fs_mode = S3C2410_IISMOD_384FS; | |
152 | if (bi % 33 == 0) { | |
153 | clk_source = S3C24XX_CLKSRC_MPLL; | |
154 | div = 1; | |
155 | } else { | |
156 | clk_source = S3C24XX_CLKSRC_PCLK; | |
157 | div = bi % 33; | |
158 | } | |
45ef4969 SN |
159 | |
160 | dev_dbg(rtd->dev, "%s desired rate %lu, %d\n", __func__, rate, bi); | |
7ad933d7 CP |
161 | |
162 | clk = (fs_mode == S3C2410_IISMOD_384FS ? 384 : 256) * rate; | |
45ef4969 SN |
163 | |
164 | dev_dbg(rtd->dev, "%s will use: %s %s %d sysclk %d err %ld\n", __func__, | |
165 | fs_mode == S3C2410_IISMOD_384FS ? "384FS" : "256FS", | |
166 | clk_source == S3C24XX_CLKSRC_MPLL ? "MPLLin" : "PCLK", | |
167 | div, clk, err); | |
7ad933d7 CP |
168 | |
169 | if ((err * 100 / rate) > 5) { | |
45ef4969 SN |
170 | dev_err(rtd->dev, "effective frequency too different " |
171 | "from desired (%ld%%)\n", err * 100 / rate); | |
7ad933d7 CP |
172 | return -EINVAL; |
173 | } | |
174 | ||
d0c36631 MB |
175 | ret = snd_soc_dai_set_sysclk(cpu_dai, clk_source , clk, |
176 | SND_SOC_CLOCK_IN); | |
7ad933d7 CP |
177 | if (ret < 0) |
178 | return ret; | |
179 | ||
d0c36631 | 180 | ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK, fs_mode); |
7ad933d7 CP |
181 | if (ret < 0) |
182 | return ret; | |
183 | ||
d0c36631 MB |
184 | ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_BCLK, |
185 | S3C2410_IISMOD_32FS); | |
7ad933d7 CP |
186 | if (ret < 0) |
187 | return ret; | |
188 | ||
d0c36631 MB |
189 | ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER, |
190 | S3C24XX_PRESCALE(div, div)); | |
7ad933d7 CP |
191 | if (ret < 0) |
192 | return ret; | |
193 | ||
194 | /* set the codec system clock for DAC and ADC */ | |
d0c36631 MB |
195 | ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk, |
196 | SND_SOC_CLOCK_OUT); | |
7ad933d7 CP |
197 | if (ret < 0) |
198 | return ret; | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static struct snd_soc_ops s3c24xx_uda134x_ops = { | |
204 | .startup = s3c24xx_uda134x_startup, | |
205 | .shutdown = s3c24xx_uda134x_shutdown, | |
206 | .hw_params = s3c24xx_uda134x_hw_params, | |
207 | }; | |
208 | ||
209 | static struct snd_soc_dai_link s3c24xx_uda134x_dai_link = { | |
210 | .name = "UDA134X", | |
211 | .stream_name = "UDA134X", | |
a110f4ef | 212 | .codec_name = "uda134x-codec", |
f0fba2ad | 213 | .codec_dai_name = "uda134x-hifi", |
518aa59f | 214 | .cpu_dai_name = "s3c24xx-iis", |
517b9a2a LPC |
215 | .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | |
216 | SND_SOC_DAIFMT_CBS_CFS, | |
7ad933d7 | 217 | .ops = &s3c24xx_uda134x_ops, |
a08485d8 | 218 | .platform_name = "s3c24xx-iis", |
7ad933d7 CP |
219 | }; |
220 | ||
87506549 | 221 | static struct snd_soc_card snd_soc_s3c24xx_uda134x = { |
7ad933d7 | 222 | .name = "S3C24XX_UDA134X", |
095d79dc | 223 | .owner = THIS_MODULE, |
7ad933d7 CP |
224 | .dai_link = &s3c24xx_uda134x_dai_link, |
225 | .num_links = 1, | |
226 | }; | |
227 | ||
7ad933d7 CP |
228 | static int s3c24xx_uda134x_probe(struct platform_device *pdev) |
229 | { | |
28405212 | 230 | struct snd_soc_card *card = &snd_soc_s3c24xx_uda134x; |
7ad933d7 CP |
231 | int ret; |
232 | ||
28405212 SN |
233 | platform_set_drvdata(pdev, card); |
234 | card->dev = &pdev->dev; | |
7ad933d7 | 235 | |
28405212 SN |
236 | ret = devm_snd_soc_register_card(&pdev->dev, card); |
237 | if (ret) | |
238 | dev_err(&pdev->dev, "failed to register card: %d\n", ret); | |
7ad933d7 CP |
239 | |
240 | return ret; | |
241 | } | |
242 | ||
7ad933d7 CP |
243 | static struct platform_driver s3c24xx_uda134x_driver = { |
244 | .probe = s3c24xx_uda134x_probe, | |
7ad933d7 CP |
245 | .driver = { |
246 | .name = "s3c24xx_uda134x", | |
7ad933d7 CP |
247 | }, |
248 | }; | |
e00c3f55 | 249 | module_platform_driver(s3c24xx_uda134x_driver); |
7ad933d7 CP |
250 | |
251 | MODULE_AUTHOR("Zoltan Devai, Christian Pellegrin <chripell@evolware.org>"); | |
252 | MODULE_DESCRIPTION("S3C24XX_UDA134X ALSA SoC audio driver"); | |
253 | MODULE_LICENSE("GPL"); |