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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/clk.h> | |
15 | #include <linux/gpio.h> | |
16 | #include <linux/module.h> | |
17 | ||
18 | #include <sound/soc.h> | |
19 | #include <sound/s3c24xx_uda134x.h> | |
20 | ||
21 | #include <plat/regs-iis.h> | |
22 | ||
23 | #include "s3c24xx-i2s.h" | |
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 | ||
57 | static struct platform_device *s3c24xx_uda134x_snd_device; | |
58 | ||
59 | static int s3c24xx_uda134x_startup(struct snd_pcm_substream *substream) | |
60 | { | |
61 | int ret = 0; | |
62 | #ifdef ENFORCE_RATES | |
63 | struct snd_pcm_runtime *runtime = substream->runtime; | |
64 | #endif | |
65 | ||
66 | mutex_lock(&clk_lock); | |
67 | pr_debug("%s %d\n", __func__, clk_users); | |
68 | if (clk_users == 0) { | |
69 | xtal = clk_get(&s3c24xx_uda134x_snd_device->dev, "xtal"); | |
70 | if (IS_ERR(xtal)) { | |
71 | printk(KERN_ERR "%s cannot get xtal\n", __func__); | |
72 | ret = PTR_ERR(xtal); | |
73 | } else { | |
74 | pclk = clk_get(&s3c24xx_uda134x_snd_device->dev, | |
75 | "pclk"); | |
76 | if (IS_ERR(pclk)) { | |
77 | printk(KERN_ERR "%s cannot get pclk\n", | |
78 | __func__); | |
79 | clk_put(xtal); | |
80 | ret = PTR_ERR(pclk); | |
81 | } | |
82 | } | |
83 | if (!ret) { | |
84 | int i, j; | |
85 | ||
86 | for (i = 0; i < 2; i++) { | |
87 | int fs = i ? 256 : 384; | |
88 | ||
89 | rates[i*33] = clk_get_rate(xtal) / fs; | |
90 | for (j = 1; j < 33; j++) | |
91 | rates[i*33 + j] = clk_get_rate(pclk) / | |
92 | (j * fs); | |
93 | } | |
94 | } | |
95 | } | |
96 | clk_users += 1; | |
97 | mutex_unlock(&clk_lock); | |
98 | if (!ret) { | |
99 | #ifdef ENFORCE_RATES | |
100 | ret = snd_pcm_hw_constraint_list(runtime, 0, | |
101 | SNDRV_PCM_HW_PARAM_RATE, | |
102 | &hw_constraints_rates); | |
103 | if (ret < 0) | |
104 | printk(KERN_ERR "%s cannot set constraints\n", | |
105 | __func__); | |
106 | #endif | |
107 | } | |
108 | return ret; | |
109 | } | |
110 | ||
111 | static void s3c24xx_uda134x_shutdown(struct snd_pcm_substream *substream) | |
112 | { | |
113 | mutex_lock(&clk_lock); | |
114 | pr_debug("%s %d\n", __func__, clk_users); | |
115 | clk_users -= 1; | |
116 | if (clk_users == 0) { | |
117 | clk_put(xtal); | |
118 | xtal = NULL; | |
119 | clk_put(pclk); | |
120 | pclk = NULL; | |
121 | } | |
122 | mutex_unlock(&clk_lock); | |
123 | } | |
124 | ||
125 | static int s3c24xx_uda134x_hw_params(struct snd_pcm_substream *substream, | |
126 | struct snd_pcm_hw_params *params) | |
127 | { | |
128 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
129 | struct snd_soc_dai *codec_dai = rtd->codec_dai; | |
130 | struct snd_soc_dai *cpu_dai = rtd->cpu_dai; | |
131 | unsigned int clk = 0; | |
132 | int ret = 0; | |
133 | int clk_source, fs_mode; | |
134 | unsigned long rate = params_rate(params); | |
135 | long err, cerr; | |
136 | unsigned int div; | |
137 | int i, bi; | |
138 | ||
139 | err = 999999; | |
140 | bi = 0; | |
141 | for (i = 0; i < 2*33; i++) { | |
142 | cerr = rates[i] - rate; | |
143 | if (cerr < 0) | |
144 | cerr = -cerr; | |
145 | if (cerr < err) { | |
146 | err = cerr; | |
147 | bi = i; | |
148 | } | |
149 | } | |
150 | if (bi / 33 == 1) | |
151 | fs_mode = S3C2410_IISMOD_256FS; | |
152 | else | |
153 | fs_mode = S3C2410_IISMOD_384FS; | |
154 | if (bi % 33 == 0) { | |
155 | clk_source = S3C24XX_CLKSRC_MPLL; | |
156 | div = 1; | |
157 | } else { | |
158 | clk_source = S3C24XX_CLKSRC_PCLK; | |
159 | div = bi % 33; | |
160 | } | |
161 | pr_debug("%s desired rate %lu, %d\n", __func__, rate, bi); | |
162 | ||
163 | clk = (fs_mode == S3C2410_IISMOD_384FS ? 384 : 256) * rate; | |
164 | pr_debug("%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); | |
168 | ||
169 | if ((err * 100 / rate) > 5) { | |
170 | printk(KERN_ERR "S3C24XX_UDA134X: effective frequency " | |
171 | "too different from desired (%ld%%)\n", | |
172 | err * 100 / rate); | |
173 | return -EINVAL; | |
174 | } | |
175 | ||
176 | ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S | | |
177 | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS); | |
178 | if (ret < 0) | |
179 | return ret; | |
180 | ||
181 | ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S | | |
182 | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS); | |
183 | if (ret < 0) | |
184 | return ret; | |
185 | ||
186 | ret = snd_soc_dai_set_sysclk(cpu_dai, clk_source , clk, | |
187 | SND_SOC_CLOCK_IN); | |
188 | if (ret < 0) | |
189 | return ret; | |
190 | ||
191 | ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK, fs_mode); | |
192 | if (ret < 0) | |
193 | return ret; | |
194 | ||
195 | ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_BCLK, | |
196 | S3C2410_IISMOD_32FS); | |
197 | if (ret < 0) | |
198 | return ret; | |
199 | ||
200 | ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER, | |
201 | S3C24XX_PRESCALE(div, div)); | |
202 | if (ret < 0) | |
203 | return ret; | |
204 | ||
205 | /* set the codec system clock for DAC and ADC */ | |
206 | ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk, | |
207 | SND_SOC_CLOCK_OUT); | |
208 | if (ret < 0) | |
209 | return ret; | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | static struct snd_soc_ops s3c24xx_uda134x_ops = { | |
215 | .startup = s3c24xx_uda134x_startup, | |
216 | .shutdown = s3c24xx_uda134x_shutdown, | |
217 | .hw_params = s3c24xx_uda134x_hw_params, | |
218 | }; | |
219 | ||
220 | static struct snd_soc_dai_link s3c24xx_uda134x_dai_link = { | |
221 | .name = "UDA134X", | |
222 | .stream_name = "UDA134X", | |
223 | .codec_name = "uda134x-codec", | |
224 | .codec_dai_name = "uda134x-hifi", | |
225 | .cpu_dai_name = "s3c24xx-iis", | |
226 | .ops = &s3c24xx_uda134x_ops, | |
227 | .platform_name = "samsung-audio", | |
228 | }; | |
229 | ||
230 | static struct snd_soc_card snd_soc_s3c24xx_uda134x = { | |
231 | .name = "S3C24XX_UDA134X", | |
232 | .dai_link = &s3c24xx_uda134x_dai_link, | |
233 | .num_links = 1, | |
234 | }; | |
235 | ||
236 | static struct s3c24xx_uda134x_platform_data *s3c24xx_uda134x_l3_pins; | |
237 | ||
238 | static void setdat(int v) | |
239 | { | |
240 | gpio_set_value(s3c24xx_uda134x_l3_pins->l3_data, v > 0); | |
241 | } | |
242 | ||
243 | static void setclk(int v) | |
244 | { | |
245 | gpio_set_value(s3c24xx_uda134x_l3_pins->l3_clk, v > 0); | |
246 | } | |
247 | ||
248 | static void setmode(int v) | |
249 | { | |
250 | gpio_set_value(s3c24xx_uda134x_l3_pins->l3_mode, v > 0); | |
251 | } | |
252 | ||
253 | /* FIXME - This must be codec platform data but in which board file ?? */ | |
254 | static struct uda134x_platform_data s3c24xx_uda134x = { | |
255 | .l3 = { | |
256 | .setdat = setdat, | |
257 | .setclk = setclk, | |
258 | .setmode = setmode, | |
259 | .data_hold = 1, | |
260 | .data_setup = 1, | |
261 | .clock_high = 1, | |
262 | .mode_hold = 1, | |
263 | .mode = 1, | |
264 | .mode_setup = 1, | |
265 | }, | |
266 | }; | |
267 | ||
268 | static int s3c24xx_uda134x_setup_pin(int pin, char *fun) | |
269 | { | |
270 | if (gpio_request(pin, "s3c24xx_uda134x") < 0) { | |
271 | printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: " | |
272 | "l3 %s pin already in use", fun); | |
273 | return -EBUSY; | |
274 | } | |
275 | gpio_direction_output(pin, 0); | |
276 | return 0; | |
277 | } | |
278 | ||
279 | static int s3c24xx_uda134x_probe(struct platform_device *pdev) | |
280 | { | |
281 | int ret; | |
282 | ||
283 | printk(KERN_INFO "S3C24XX_UDA134X SoC Audio driver\n"); | |
284 | ||
285 | s3c24xx_uda134x_l3_pins = pdev->dev.platform_data; | |
286 | if (s3c24xx_uda134x_l3_pins == NULL) { | |
287 | printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: " | |
288 | "unable to find platform data\n"); | |
289 | return -ENODEV; | |
290 | } | |
291 | s3c24xx_uda134x.power = s3c24xx_uda134x_l3_pins->power; | |
292 | s3c24xx_uda134x.model = s3c24xx_uda134x_l3_pins->model; | |
293 | ||
294 | if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_data, | |
295 | "data") < 0) | |
296 | return -EBUSY; | |
297 | if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_clk, | |
298 | "clk") < 0) { | |
299 | gpio_free(s3c24xx_uda134x_l3_pins->l3_data); | |
300 | return -EBUSY; | |
301 | } | |
302 | if (s3c24xx_uda134x_setup_pin(s3c24xx_uda134x_l3_pins->l3_mode, | |
303 | "mode") < 0) { | |
304 | gpio_free(s3c24xx_uda134x_l3_pins->l3_data); | |
305 | gpio_free(s3c24xx_uda134x_l3_pins->l3_clk); | |
306 | return -EBUSY; | |
307 | } | |
308 | ||
309 | s3c24xx_uda134x_snd_device = platform_device_alloc("soc-audio", -1); | |
310 | if (!s3c24xx_uda134x_snd_device) { | |
311 | printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: " | |
312 | "Unable to register\n"); | |
313 | return -ENOMEM; | |
314 | } | |
315 | ||
316 | platform_set_drvdata(s3c24xx_uda134x_snd_device, | |
317 | &snd_soc_s3c24xx_uda134x); | |
318 | platform_device_add_data(s3c24xx_uda134x_snd_device, &s3c24xx_uda134x, sizeof(s3c24xx_uda134x)); | |
319 | ret = platform_device_add(s3c24xx_uda134x_snd_device); | |
320 | if (ret) { | |
321 | printk(KERN_ERR "S3C24XX_UDA134X SoC Audio: Unable to add\n"); | |
322 | platform_device_put(s3c24xx_uda134x_snd_device); | |
323 | } | |
324 | ||
325 | return ret; | |
326 | } | |
327 | ||
328 | static int s3c24xx_uda134x_remove(struct platform_device *pdev) | |
329 | { | |
330 | platform_device_unregister(s3c24xx_uda134x_snd_device); | |
331 | gpio_free(s3c24xx_uda134x_l3_pins->l3_data); | |
332 | gpio_free(s3c24xx_uda134x_l3_pins->l3_clk); | |
333 | gpio_free(s3c24xx_uda134x_l3_pins->l3_mode); | |
334 | return 0; | |
335 | } | |
336 | ||
337 | static struct platform_driver s3c24xx_uda134x_driver = { | |
338 | .probe = s3c24xx_uda134x_probe, | |
339 | .remove = s3c24xx_uda134x_remove, | |
340 | .driver = { | |
341 | .name = "s3c24xx_uda134x", | |
342 | .owner = THIS_MODULE, | |
343 | }, | |
344 | }; | |
345 | ||
346 | static int __init s3c24xx_uda134x_init(void) | |
347 | { | |
348 | return platform_driver_register(&s3c24xx_uda134x_driver); | |
349 | } | |
350 | ||
351 | static void __exit s3c24xx_uda134x_exit(void) | |
352 | { | |
353 | platform_driver_unregister(&s3c24xx_uda134x_driver); | |
354 | } | |
355 | ||
356 | ||
357 | module_init(s3c24xx_uda134x_init); | |
358 | module_exit(s3c24xx_uda134x_exit); | |
359 | ||
360 | MODULE_AUTHOR("Zoltan Devai, Christian Pellegrin <chripell@evolware.org>"); | |
361 | MODULE_DESCRIPTION("S3C24XX_UDA134X ALSA SoC audio driver"); | |
362 | MODULE_LICENSE("GPL"); |