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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 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/clk.h> | |
16 | #include <linux/mutex.h> | |
17 | #include <linux/gpio.h> | |
18 | #include <sound/pcm.h> | |
19 | #include <sound/pcm_params.h> | |
20 | #include <sound/soc.h> | |
21 | #include <sound/soc-dapm.h> | |
22 | #include <sound/s3c24xx_uda134x.h> | |
23 | #include <sound/uda134x.h> | |
24 | ||
8150bc88 | 25 | #include <plat/regs-iis.h> |
7ad933d7 CP |
26 | |
27 | #include "s3c24xx-pcm.h" | |
28 | #include "s3c24xx-i2s.h" | |
72f2b894 | 29 | #include "../codecs/uda134x.h" |
7ad933d7 CP |
30 | |
31 | ||
32 | /* #define ENFORCE_RATES 1 */ | |
33 | /* | |
34 | Unfortunately the S3C24XX in master mode has a limited capacity of | |
35 | generating the clock for the codec. If you define this only rates | |
36 | that are really available will be enforced. But be careful, most | |
37 | user level application just want the usual sampling frequencies (8, | |
38 | 11.025, 22.050, 44.1 kHz) and anyway resampling is a costly | |
39 | operation for embedded systems. So if you aren't very lucky or your | |
40 | hardware engineer wasn't very forward-looking it's better to leave | |
41 | this undefined. If you do so an approximate value for the requested | |
42 | sampling rate in the range -/+ 5% will be chosen. If this in not | |
43 | possible an error will be returned. | |
44 | */ | |
45 | ||
46 | static struct clk *xtal; | |
47 | static struct clk *pclk; | |
48 | /* this is need because we don't have a place where to keep the | |
49 | * pointers to the clocks in each substream. We get the clocks only | |
50 | * when we are actually using them so we don't block stuff like | |
51 | * frequency change or oscillator power-off */ | |
52 | static int clk_users; | |
53 | static DEFINE_MUTEX(clk_lock); | |
54 | ||
55 | static unsigned int rates[33 * 2]; | |
56 | #ifdef ENFORCE_RATES | |
57 | static struct snd_pcm_hw_constraint_list hw_constraints_rates = { | |
58 | .count = ARRAY_SIZE(rates), | |
59 | .list = rates, | |
60 | .mask = 0, | |
61 | }; | |
62 | #endif | |
63 | ||
64 | static struct platform_device *s3c24xx_uda134x_snd_device; | |
65 | ||
d0c36631 | 66 | static int s3c24xx_uda134x_startup(struct snd_pcm_substream *substream) |
7ad933d7 CP |
67 | { |
68 | int ret = 0; | |
69 | #ifdef ENFORCE_RATES | |
70 | struct snd_pcm_runtime *runtime = substream->runtime;; | |
71 | #endif | |
72 | ||
73 | mutex_lock(&clk_lock); | |
74 | pr_debug("%s %d\n", __func__, clk_users); | |
75 | if (clk_users == 0) { | |
76 | xtal = clk_get(&s3c24xx_uda134x_snd_device->dev, "xtal"); | |
77 | if (!xtal) { | |
78 | printk(KERN_ERR "%s cannot get xtal\n", __func__); | |
79 | ret = -EBUSY; | |
80 | } else { | |
81 | pclk = clk_get(&s3c24xx_uda134x_snd_device->dev, | |
82 | "pclk"); | |
83 | if (!pclk) { | |
84 | printk(KERN_ERR "%s cannot get pclk\n", | |
85 | __func__); | |
86 | clk_put(xtal); | |
87 | ret = -EBUSY; | |
88 | } | |
89 | } | |
90 | if (!ret) { | |
91 | int i, j; | |
92 | ||
93 | for (i = 0; i < 2; i++) { | |
94 | int fs = i ? 256 : 384; | |
95 | ||
96 | rates[i*33] = clk_get_rate(xtal) / fs; | |
97 | for (j = 1; j < 33; j++) | |
98 | rates[i*33 + j] = clk_get_rate(pclk) / | |
99 | (j * fs); | |
100 | } | |
101 | } | |
102 | } | |
103 | clk_users += 1; | |
104 | mutex_unlock(&clk_lock); | |
105 | if (!ret) { | |
106 | #ifdef ENFORCE_RATES | |
107 | ret = snd_pcm_hw_constraint_list(runtime, 0, | |
108 | SNDRV_PCM_HW_PARAM_RATE, | |
109 | &hw_constraints_rates); | |
110 | if (ret < 0) | |
111 | printk(KERN_ERR "%s cannot set constraints\n", | |
112 | __func__); | |
113 | #endif | |
114 | } | |
115 | return ret; | |
116 | } | |
117 | ||
d0c36631 | 118 | static void s3c24xx_uda134x_shutdown(struct snd_pcm_substream *substream) |
7ad933d7 CP |
119 | { |
120 | mutex_lock(&clk_lock); | |
121 | pr_debug("%s %d\n", __func__, clk_users); | |
122 | clk_users -= 1; | |
123 | if (clk_users == 0) { | |
124 | clk_put(xtal); | |
125 | xtal = NULL; | |
126 | clk_put(pclk); | |
127 | pclk = NULL; | |
128 | } | |
129 | mutex_unlock(&clk_lock); | |
130 | } | |
131 | ||
132 | static int s3c24xx_uda134x_hw_params(struct snd_pcm_substream *substream, | |
133 | struct snd_pcm_hw_params *params) | |
134 | { | |
135 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
136 | struct snd_soc_dai *codec_dai = rtd->dai->codec_dai; | |
137 | struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai; | |
138 | unsigned int clk = 0; | |
139 | int ret = 0; | |
140 | int clk_source, fs_mode; | |
141 | unsigned long rate = params_rate(params); | |
142 | long err, cerr; | |
143 | unsigned int div; | |
144 | int i, bi; | |
145 | ||
146 | err = 999999; | |
147 | bi = 0; | |
148 | for (i = 0; i < 2*33; i++) { | |
149 | cerr = rates[i] - rate; | |
150 | if (cerr < 0) | |
151 | cerr = -cerr; | |
152 | if (cerr < err) { | |
153 | err = cerr; | |
154 | bi = i; | |
155 | } | |
156 | } | |
157 | if (bi / 33 == 1) | |
158 | fs_mode = S3C2410_IISMOD_256FS; | |
159 | else | |
160 | fs_mode = S3C2410_IISMOD_384FS; | |
161 | if (bi % 33 == 0) { | |
162 | clk_source = S3C24XX_CLKSRC_MPLL; | |
163 | div = 1; | |
164 | } else { | |
165 | clk_source = S3C24XX_CLKSRC_PCLK; | |
166 | div = bi % 33; | |
167 | } | |
168 | pr_debug("%s desired rate %lu, %d\n", __func__, rate, bi); | |
169 | ||
170 | clk = (fs_mode == S3C2410_IISMOD_384FS ? 384 : 256) * rate; | |
171 | pr_debug("%s will use: %s %s %d sysclk %d err %ld\n", __func__, | |
172 | fs_mode == S3C2410_IISMOD_384FS ? "384FS" : "256FS", | |
173 | clk_source == S3C24XX_CLKSRC_MPLL ? "MPLLin" : "PCLK", | |
174 | div, clk, err); | |
175 | ||
176 | if ((err * 100 / rate) > 5) { | |
177 | printk(KERN_ERR "S3C24XX_UDA134X: effective frequency " | |
178 | "too different from desired (%ld%%)\n", | |
179 | err * 100 / rate); | |
180 | return -EINVAL; | |
181 | } | |
182 | ||
d0c36631 | 183 | ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S | |
7ad933d7 CP |
184 | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS); |
185 | if (ret < 0) | |
186 | return ret; | |
187 | ||
d0c36631 | 188 | ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S | |
7ad933d7 CP |
189 | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS); |
190 | if (ret < 0) | |
191 | return ret; | |
192 | ||
d0c36631 MB |
193 | ret = snd_soc_dai_set_sysclk(cpu_dai, clk_source , clk, |
194 | SND_SOC_CLOCK_IN); | |
7ad933d7 CP |
195 | if (ret < 0) |
196 | return ret; | |
197 | ||
d0c36631 | 198 | ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK, fs_mode); |
7ad933d7 CP |
199 | if (ret < 0) |
200 | return ret; | |
201 | ||
d0c36631 MB |
202 | ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_BCLK, |
203 | S3C2410_IISMOD_32FS); | |
7ad933d7 CP |
204 | if (ret < 0) |
205 | return ret; | |
206 | ||
d0c36631 MB |
207 | ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER, |
208 | S3C24XX_PRESCALE(div, div)); | |
7ad933d7 CP |
209 | if (ret < 0) |
210 | return ret; | |
211 | ||
212 | /* set the codec system clock for DAC and ADC */ | |
d0c36631 MB |
213 | ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk, |
214 | SND_SOC_CLOCK_OUT); | |
7ad933d7 CP |
215 | if (ret < 0) |
216 | return ret; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static struct snd_soc_ops s3c24xx_uda134x_ops = { | |
222 | .startup = s3c24xx_uda134x_startup, | |
223 | .shutdown = s3c24xx_uda134x_shutdown, | |
224 | .hw_params = s3c24xx_uda134x_hw_params, | |
225 | }; | |
226 | ||
227 | static struct snd_soc_dai_link s3c24xx_uda134x_dai_link = { | |
228 | .name = "UDA134X", | |
229 | .stream_name = "UDA134X", | |
230 | .codec_dai = &uda134x_dai, | |
231 | .cpu_dai = &s3c24xx_i2s_dai, | |
232 | .ops = &s3c24xx_uda134x_ops, | |
233 | }; | |
234 | ||
87506549 | 235 | static struct snd_soc_card snd_soc_s3c24xx_uda134x = { |
7ad933d7 | 236 | .name = "S3C24XX_UDA134X", |
87689d56 | 237 | .platform = &s3c24xx_soc_platform, |
7ad933d7 CP |
238 | .dai_link = &s3c24xx_uda134x_dai_link, |
239 | .num_links = 1, | |
240 | }; | |
241 | ||
242 | static struct s3c24xx_uda134x_platform_data *s3c24xx_uda134x_l3_pins; | |
243 | ||
244 | static void setdat(int v) | |
245 | { | |
246 | gpio_set_value(s3c24xx_uda134x_l3_pins->l3_data, v > 0); | |
247 | } | |
248 | ||
249 | static void setclk(int v) | |
250 | { | |
251 | gpio_set_value(s3c24xx_uda134x_l3_pins->l3_clk, v > 0); | |
252 | } | |
253 | ||
254 | static void setmode(int v) | |
255 | { | |
256 | gpio_set_value(s3c24xx_uda134x_l3_pins->l3_mode, v > 0); | |
257 | } | |
258 | ||
259 | static struct uda134x_platform_data s3c24xx_uda134x = { | |
260 | .l3 = { | |
261 | .setdat = setdat, | |
262 | .setclk = setclk, | |
263 | .setmode = setmode, | |
264 | .data_hold = 1, | |
265 | .data_setup = 1, | |
266 | .clock_high = 1, | |
267 | .mode_hold = 1, | |
268 | .mode = 1, | |
269 | .mode_setup = 1, | |
270 | }, | |
271 | }; | |
272 | ||
273 | static struct snd_soc_device s3c24xx_uda134x_snd_devdata = { | |
87506549 | 274 | .card = &snd_soc_s3c24xx_uda134x, |
7ad933d7 CP |
275 | .codec_dev = &soc_codec_dev_uda134x, |
276 | .codec_data = &s3c24xx_uda134x, | |
277 | }; | |
278 | ||
279 | static int s3c24xx_uda134x_setup_pin(int pin, char *fun) | |
280 | { | |
281 | if (gpio_request(pin, "s3c24xx_uda134x") < 0) { | |
282 | printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: " | |
283 | "l3 %s pin already in use", fun); | |
284 | return -EBUSY; | |
285 | } | |
286 | gpio_direction_output(pin, 0); | |
287 | return 0; | |
288 | } | |
289 | ||
290 | static int s3c24xx_uda134x_probe(struct platform_device *pdev) | |
291 | { | |
292 | int ret; | |
293 | ||
294 | printk(KERN_INFO "S3C24XX_UDA134X SoC Audio driver\n"); | |
295 | ||
296 | s3c24xx_uda134x_l3_pins = pdev->dev.platform_data; | |
297 | if (s3c24xx_uda134x_l3_pins == NULL) { | |
298 | printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: " | |
299 | "unable to find platform data\n"); | |
300 | return -ENODEV; | |
301 | } | |
302 | s3c24xx_uda134x.power = s3c24xx_uda134x_l3_pins->power; | |
303 | s3c24xx_uda134x.model = s3c24xx_uda134x_l3_pins->model; | |
304 | ||
305 | if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_data, | |
306 | "data") < 0) | |
307 | return -EBUSY; | |
308 | if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_clk, | |
309 | "clk") < 0) { | |
310 | gpio_free(s3c24xx_uda134x_l3_pins->l3_data); | |
311 | return -EBUSY; | |
312 | } | |
313 | if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_mode, | |
314 | "mode") < 0) { | |
315 | gpio_free(s3c24xx_uda134x_l3_pins->l3_data); | |
316 | gpio_free(s3c24xx_uda134x_l3_pins->l3_clk); | |
317 | return -EBUSY; | |
318 | } | |
319 | ||
320 | s3c24xx_uda134x_snd_device = platform_device_alloc("soc-audio", -1); | |
321 | if (!s3c24xx_uda134x_snd_device) { | |
322 | printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: " | |
323 | "Unable to register\n"); | |
324 | return -ENOMEM; | |
325 | } | |
326 | ||
327 | platform_set_drvdata(s3c24xx_uda134x_snd_device, | |
328 | &s3c24xx_uda134x_snd_devdata); | |
329 | s3c24xx_uda134x_snd_devdata.dev = &s3c24xx_uda134x_snd_device->dev; | |
330 | ret = platform_device_add(s3c24xx_uda134x_snd_device); | |
331 | if (ret) { | |
332 | printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: Unable to add\n"); | |
333 | platform_device_put(s3c24xx_uda134x_snd_device); | |
334 | } | |
335 | ||
336 | return ret; | |
337 | } | |
338 | ||
339 | static int s3c24xx_uda134x_remove(struct platform_device *pdev) | |
340 | { | |
341 | platform_device_unregister(s3c24xx_uda134x_snd_device); | |
342 | gpio_free(s3c24xx_uda134x_l3_pins->l3_data); | |
343 | gpio_free(s3c24xx_uda134x_l3_pins->l3_clk); | |
344 | gpio_free(s3c24xx_uda134x_l3_pins->l3_mode); | |
345 | return 0; | |
346 | } | |
347 | ||
348 | static struct platform_driver s3c24xx_uda134x_driver = { | |
349 | .probe = s3c24xx_uda134x_probe, | |
350 | .remove = s3c24xx_uda134x_remove, | |
351 | .driver = { | |
352 | .name = "s3c24xx_uda134x", | |
353 | .owner = THIS_MODULE, | |
354 | }, | |
355 | }; | |
356 | ||
357 | static int __init s3c24xx_uda134x_init(void) | |
358 | { | |
359 | return platform_driver_register(&s3c24xx_uda134x_driver); | |
360 | } | |
361 | ||
362 | static void __exit s3c24xx_uda134x_exit(void) | |
363 | { | |
364 | platform_driver_unregister(&s3c24xx_uda134x_driver); | |
365 | } | |
366 | ||
367 | ||
368 | module_init(s3c24xx_uda134x_init); | |
369 | module_exit(s3c24xx_uda134x_exit); | |
370 | ||
371 | MODULE_AUTHOR("Zoltan Devai, Christian Pellegrin <chripell@evolware.org>"); | |
372 | MODULE_DESCRIPTION("S3C24XX_UDA134X ALSA SoC audio driver"); | |
373 | MODULE_LICENSE("GPL"); |