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1 | /* sound/soc/at32/playpaq_wm8510.c | |
2 | * ASoC machine driver for PlayPaq using WM8510 codec | |
3 | * | |
4 | * Copyright (C) 2008 Long Range Systems | |
5 | * Geoffrey Wossum <gwossum@acm.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This code is largely inspired by sound/soc/at91/eti_b1_wm8731.c | |
12 | * | |
13 | * NOTE: If you don't have the AT32 enhanced portmux configured (which | |
14 | * isn't currently in the mainline or Atmel patched kernel), you will | |
15 | * need to set the MCLK pin (PA30) to peripheral A in your board initialization | |
16 | * code. Something like: | |
17 | * at32_select_periph(GPIO_PIN_PA(30), GPIO_PERIPH_A, 0); | |
18 | * | |
19 | */ | |
20 | ||
21 | /* #define DEBUG */ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/moduleparam.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/clk.h> | |
28 | #include <linux/timer.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/platform_device.h> | |
31 | ||
32 | #include <sound/core.h> | |
33 | #include <sound/pcm.h> | |
34 | #include <sound/pcm_params.h> | |
35 | #include <sound/soc.h> | |
36 | ||
37 | #include <mach/at32ap700x.h> | |
38 | #include <mach/portmux.h> | |
39 | ||
40 | #include "../codecs/wm8510.h" | |
41 | #include "atmel-pcm.h" | |
42 | #include "atmel_ssc_dai.h" | |
43 | ||
44 | ||
45 | /*-------------------------------------------------------------------------*\ | |
46 | * constants | |
47 | \*-------------------------------------------------------------------------*/ | |
48 | #define MCLK_PIN GPIO_PIN_PA(30) | |
49 | #define MCLK_PERIPH GPIO_PERIPH_A | |
50 | ||
51 | ||
52 | /*-------------------------------------------------------------------------*\ | |
53 | * data types | |
54 | \*-------------------------------------------------------------------------*/ | |
55 | /* SSC clocking data */ | |
56 | struct ssc_clock_data { | |
57 | /* CMR div */ | |
58 | unsigned int cmr_div; | |
59 | ||
60 | /* Frame period (as needed by xCMR.PERIOD) */ | |
61 | unsigned int period; | |
62 | ||
63 | /* The SSC clock rate these settings where calculated for */ | |
64 | unsigned long ssc_rate; | |
65 | }; | |
66 | ||
67 | ||
68 | /*-------------------------------------------------------------------------*\ | |
69 | * module data | |
70 | \*-------------------------------------------------------------------------*/ | |
71 | static struct clk *_gclk0; | |
72 | static struct clk *_pll0; | |
73 | ||
74 | #define CODEC_CLK (_gclk0) | |
75 | ||
76 | ||
77 | /*-------------------------------------------------------------------------*\ | |
78 | * Sound SOC operations | |
79 | \*-------------------------------------------------------------------------*/ | |
80 | #if defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE | |
81 | static struct ssc_clock_data playpaq_wm8510_calc_ssc_clock( | |
82 | struct snd_pcm_hw_params *params, | |
83 | struct snd_soc_dai *cpu_dai) | |
84 | { | |
85 | struct at32_ssc_info *ssc_p = snd_soc_dai_get_drvdata(cpu_dai); | |
86 | struct ssc_device *ssc = ssc_p->ssc; | |
87 | struct ssc_clock_data cd; | |
88 | unsigned int rate, width_bits, channels; | |
89 | unsigned int bitrate, ssc_div; | |
90 | unsigned actual_rate; | |
91 | ||
92 | ||
93 | /* | |
94 | * Figure out required bitrate | |
95 | */ | |
96 | rate = params_rate(params); | |
97 | channels = params_channels(params); | |
98 | width_bits = snd_pcm_format_physical_width(params_format(params)); | |
99 | bitrate = rate * width_bits * channels; | |
100 | ||
101 | ||
102 | /* | |
103 | * Figure out required SSC divider and period for required bitrate | |
104 | */ | |
105 | cd.ssc_rate = clk_get_rate(ssc->clk); | |
106 | ssc_div = cd.ssc_rate / bitrate; | |
107 | cd.cmr_div = ssc_div / 2; | |
108 | if (ssc_div & 1) { | |
109 | /* round cmr_div up */ | |
110 | cd.cmr_div++; | |
111 | } | |
112 | cd.period = width_bits - 1; | |
113 | ||
114 | ||
115 | /* | |
116 | * Find actual rate, compare to requested rate | |
117 | */ | |
118 | actual_rate = (cd.ssc_rate / (cd.cmr_div * 2)) / (2 * (cd.period + 1)); | |
119 | pr_debug("playpaq_wm8510: Request rate = %u, actual rate = %u\n", | |
120 | rate, actual_rate); | |
121 | ||
122 | ||
123 | return cd; | |
124 | } | |
125 | #endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */ | |
126 | ||
127 | ||
128 | ||
129 | static int playpaq_wm8510_hw_params(struct snd_pcm_substream *substream, | |
130 | struct snd_pcm_hw_params *params) | |
131 | { | |
132 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
133 | struct snd_soc_dai *codec_dai = rtd->codec_dai; | |
134 | struct snd_soc_dai *cpu_dai = rtd->cpu_dai; | |
135 | struct at32_ssc_info *ssc_p = snd_soc_dai_get_drvdata(cpu_dai); | |
136 | struct ssc_device *ssc = ssc_p->ssc; | |
137 | unsigned int pll_out = 0, bclk = 0, mclk_div = 0; | |
138 | int ret; | |
139 | ||
140 | ||
141 | /* Due to difficulties with getting the correct clocks from the AT32's | |
142 | * PLL0, we're going to let the CODEC be in charge of all the clocks | |
143 | */ | |
144 | #if !defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE | |
145 | const unsigned int fmt = (SND_SOC_DAIFMT_I2S | | |
146 | SND_SOC_DAIFMT_NB_NF | | |
147 | SND_SOC_DAIFMT_CBM_CFM); | |
148 | #else | |
149 | struct ssc_clock_data cd; | |
150 | const unsigned int fmt = (SND_SOC_DAIFMT_I2S | | |
151 | SND_SOC_DAIFMT_NB_NF | | |
152 | SND_SOC_DAIFMT_CBS_CFS); | |
153 | #endif | |
154 | ||
155 | if (ssc == NULL) { | |
156 | pr_warning("playpaq_wm8510_hw_params: ssc is NULL!\n"); | |
157 | return -EINVAL; | |
158 | } | |
159 | ||
160 | ||
161 | /* | |
162 | * Figure out PLL and BCLK dividers for WM8510 | |
163 | */ | |
164 | switch (params_rate(params)) { | |
165 | case 48000: | |
166 | pll_out = 24576000; | |
167 | mclk_div = WM8510_MCLKDIV_2; | |
168 | bclk = WM8510_BCLKDIV_8; | |
169 | break; | |
170 | ||
171 | case 44100: | |
172 | pll_out = 22579200; | |
173 | mclk_div = WM8510_MCLKDIV_2; | |
174 | bclk = WM8510_BCLKDIV_8; | |
175 | break; | |
176 | ||
177 | case 22050: | |
178 | pll_out = 22579200; | |
179 | mclk_div = WM8510_MCLKDIV_4; | |
180 | bclk = WM8510_BCLKDIV_8; | |
181 | break; | |
182 | ||
183 | case 16000: | |
184 | pll_out = 24576000; | |
185 | mclk_div = WM8510_MCLKDIV_6; | |
186 | bclk = WM8510_BCLKDIV_8; | |
187 | break; | |
188 | ||
189 | case 11025: | |
190 | pll_out = 22579200; | |
191 | mclk_div = WM8510_MCLKDIV_8; | |
192 | bclk = WM8510_BCLKDIV_8; | |
193 | break; | |
194 | ||
195 | case 8000: | |
196 | pll_out = 24576000; | |
197 | mclk_div = WM8510_MCLKDIV_12; | |
198 | bclk = WM8510_BCLKDIV_8; | |
199 | break; | |
200 | ||
201 | default: | |
202 | pr_warning("playpaq_wm8510: Unsupported sample rate %d\n", | |
203 | params_rate(params)); | |
204 | return -EINVAL; | |
205 | } | |
206 | ||
207 | ||
208 | /* | |
209 | * set CPU and CODEC DAI configuration | |
210 | */ | |
211 | ret = snd_soc_dai_set_fmt(codec_dai, fmt); | |
212 | if (ret < 0) { | |
213 | pr_warning("playpaq_wm8510: " | |
214 | "Failed to set CODEC DAI format (%d)\n", | |
215 | ret); | |
216 | return ret; | |
217 | } | |
218 | ret = snd_soc_dai_set_fmt(cpu_dai, fmt); | |
219 | if (ret < 0) { | |
220 | pr_warning("playpaq_wm8510: " | |
221 | "Failed to set CPU DAI format (%d)\n", | |
222 | ret); | |
223 | return ret; | |
224 | } | |
225 | ||
226 | ||
227 | /* | |
228 | * Set CPU clock configuration | |
229 | */ | |
230 | #if defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE | |
231 | cd = playpaq_wm8510_calc_ssc_clock(params, cpu_dai); | |
232 | pr_debug("playpaq_wm8510: cmr_div = %d, period = %d\n", | |
233 | cd.cmr_div, cd.period); | |
234 | ret = snd_soc_dai_set_clkdiv(cpu_dai, AT32_SSC_CMR_DIV, cd.cmr_div); | |
235 | if (ret < 0) { | |
236 | pr_warning("playpaq_wm8510: Failed to set CPU CMR_DIV (%d)\n", | |
237 | ret); | |
238 | return ret; | |
239 | } | |
240 | ret = snd_soc_dai_set_clkdiv(cpu_dai, AT32_SSC_TCMR_PERIOD, | |
241 | cd.period); | |
242 | if (ret < 0) { | |
243 | pr_warning("playpaq_wm8510: " | |
244 | "Failed to set CPU transmit period (%d)\n", | |
245 | ret); | |
246 | return ret; | |
247 | } | |
248 | #endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */ | |
249 | ||
250 | ||
251 | /* | |
252 | * Set CODEC clock configuration | |
253 | */ | |
254 | pr_debug("playpaq_wm8510: " | |
255 | "pll_in = %ld, pll_out = %u, bclk = %x, mclk = %x\n", | |
256 | clk_get_rate(CODEC_CLK), pll_out, bclk, mclk_div); | |
257 | ||
258 | ||
259 | #if !defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE | |
260 | ret = snd_soc_dai_set_clkdiv(codec_dai, WM8510_BCLKDIV, bclk); | |
261 | if (ret < 0) { | |
262 | pr_warning | |
263 | ("playpaq_wm8510: Failed to set CODEC DAI BCLKDIV (%d)\n", | |
264 | ret); | |
265 | return ret; | |
266 | } | |
267 | #endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */ | |
268 | ||
269 | ||
270 | ret = snd_soc_dai_set_pll(codec_dai, 0, 0, | |
271 | clk_get_rate(CODEC_CLK), pll_out); | |
272 | if (ret < 0) { | |
273 | pr_warning("playpaq_wm8510: Failed to set CODEC DAI PLL (%d)\n", | |
274 | ret); | |
275 | return ret; | |
276 | } | |
277 | ||
278 | ||
279 | ret = snd_soc_dai_set_clkdiv(codec_dai, WM8510_MCLKDIV, mclk_div); | |
280 | if (ret < 0) { | |
281 | pr_warning("playpaq_wm8510: Failed to set CODEC MCLKDIV (%d)\n", | |
282 | ret); | |
283 | return ret; | |
284 | } | |
285 | ||
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | ||
291 | ||
292 | static struct snd_soc_ops playpaq_wm8510_ops = { | |
293 | .hw_params = playpaq_wm8510_hw_params, | |
294 | }; | |
295 | ||
296 | ||
297 | ||
298 | static const struct snd_soc_dapm_widget playpaq_dapm_widgets[] = { | |
299 | SND_SOC_DAPM_MIC("Int Mic", NULL), | |
300 | SND_SOC_DAPM_SPK("Ext Spk", NULL), | |
301 | }; | |
302 | ||
303 | ||
304 | ||
305 | static const struct snd_soc_dapm_route intercon[] = { | |
306 | /* speaker connected to SPKOUT */ | |
307 | {"Ext Spk", NULL, "SPKOUTP"}, | |
308 | {"Ext Spk", NULL, "SPKOUTN"}, | |
309 | ||
310 | {"Mic Bias", NULL, "Int Mic"}, | |
311 | {"MICN", NULL, "Mic Bias"}, | |
312 | {"MICP", NULL, "Mic Bias"}, | |
313 | }; | |
314 | ||
315 | ||
316 | ||
317 | static int playpaq_wm8510_init(struct snd_soc_pcm_runtime *rtd) | |
318 | { | |
319 | struct snd_soc_codec *codec = rtd->codec; | |
320 | struct snd_soc_dapm_context *dapm = &codec->dapm; | |
321 | int i; | |
322 | ||
323 | /* | |
324 | * Add DAPM widgets | |
325 | */ | |
326 | for (i = 0; i < ARRAY_SIZE(playpaq_dapm_widgets); i++) | |
327 | snd_soc_dapm_new_control(dapm, &playpaq_dapm_widgets[i]); | |
328 | ||
329 | ||
330 | ||
331 | /* | |
332 | * Setup audio path interconnects | |
333 | */ | |
334 | snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon)); | |
335 | ||
336 | ||
337 | ||
338 | /* always connected pins */ | |
339 | snd_soc_dapm_enable_pin(dapm, "Int Mic"); | |
340 | snd_soc_dapm_enable_pin(dapm, "Ext Spk"); | |
341 | ||
342 | ||
343 | ||
344 | /* Make CSB show PLL rate */ | |
345 | snd_soc_dai_set_clkdiv(rtd->codec_dai, WM8510_OPCLKDIV, | |
346 | WM8510_OPCLKDIV_1 | 4); | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
351 | ||
352 | ||
353 | static struct snd_soc_dai_link playpaq_wm8510_dai = { | |
354 | .name = "WM8510", | |
355 | .stream_name = "WM8510 PCM", | |
356 | .cpu_dai_name= "atmel-ssc-dai.0", | |
357 | .platform_name = "atmel-pcm-audio", | |
358 | .codec_name = "wm8510-codec.0-0x1a", | |
359 | .codec_dai_name = "wm8510-hifi", | |
360 | .init = playpaq_wm8510_init, | |
361 | .ops = &playpaq_wm8510_ops, | |
362 | }; | |
363 | ||
364 | ||
365 | ||
366 | static struct snd_soc_card snd_soc_playpaq = { | |
367 | .name = "LRS_PlayPaq_WM8510", | |
368 | .dai_link = &playpaq_wm8510_dai, | |
369 | .num_links = 1, | |
370 | }; | |
371 | ||
372 | static struct platform_device *playpaq_snd_device; | |
373 | ||
374 | ||
375 | static int __init playpaq_asoc_init(void) | |
376 | { | |
377 | int ret = 0; | |
378 | ||
379 | /* | |
380 | * Configure MCLK for WM8510 | |
381 | */ | |
382 | _gclk0 = clk_get(NULL, "gclk0"); | |
383 | if (IS_ERR(_gclk0)) { | |
384 | _gclk0 = NULL; | |
385 | ret = PTR_ERR(_gclk0); | |
386 | goto err_gclk0; | |
387 | } | |
388 | _pll0 = clk_get(NULL, "pll0"); | |
389 | if (IS_ERR(_pll0)) { | |
390 | _pll0 = NULL; | |
391 | ret = PTR_ERR(_pll0); | |
392 | goto err_pll0; | |
393 | } | |
394 | ret = clk_set_parent(_gclk0, _pll0); | |
395 | if (ret) { | |
396 | pr_warning("snd-soc-playpaq: " | |
397 | "Failed to set PLL0 as parent for DAC clock\n"); | |
398 | goto err_set_clk; | |
399 | } | |
400 | clk_set_rate(CODEC_CLK, 12000000); | |
401 | clk_enable(CODEC_CLK); | |
402 | ||
403 | #if defined CONFIG_AT32_ENHANCED_PORTMUX | |
404 | at32_select_periph(MCLK_PIN, MCLK_PERIPH, 0); | |
405 | #endif | |
406 | ||
407 | ||
408 | /* | |
409 | * Create and register platform device | |
410 | */ | |
411 | playpaq_snd_device = platform_device_alloc("soc-audio", 0); | |
412 | if (playpaq_snd_device == NULL) { | |
413 | ret = -ENOMEM; | |
414 | goto err_device_alloc; | |
415 | } | |
416 | ||
417 | platform_set_drvdata(playpaq_snd_device, &snd_soc_playpaq); | |
418 | ||
419 | ret = platform_device_add(playpaq_snd_device); | |
420 | if (ret) { | |
421 | pr_warning("playpaq_wm8510: platform_device_add failed (%d)\n", | |
422 | ret); | |
423 | goto err_device_add; | |
424 | } | |
425 | ||
426 | return 0; | |
427 | ||
428 | ||
429 | err_device_add: | |
430 | if (playpaq_snd_device != NULL) { | |
431 | platform_device_put(playpaq_snd_device); | |
432 | playpaq_snd_device = NULL; | |
433 | } | |
434 | err_device_alloc: | |
435 | err_set_clk: | |
436 | if (_pll0 != NULL) { | |
437 | clk_put(_pll0); | |
438 | _pll0 = NULL; | |
439 | } | |
440 | err_pll0: | |
441 | if (_gclk0 != NULL) { | |
442 | clk_put(_gclk0); | |
443 | _gclk0 = NULL; | |
444 | } | |
445 | return ret; | |
446 | } | |
447 | ||
448 | ||
449 | static void __exit playpaq_asoc_exit(void) | |
450 | { | |
451 | if (_gclk0 != NULL) { | |
452 | clk_put(_gclk0); | |
453 | _gclk0 = NULL; | |
454 | } | |
455 | if (_pll0 != NULL) { | |
456 | clk_put(_pll0); | |
457 | _pll0 = NULL; | |
458 | } | |
459 | ||
460 | #if defined CONFIG_AT32_ENHANCED_PORTMUX | |
461 | at32_free_pin(MCLK_PIN); | |
462 | #endif | |
463 | ||
464 | platform_device_unregister(playpaq_snd_device); | |
465 | playpaq_snd_device = NULL; | |
466 | } | |
467 | ||
468 | module_init(playpaq_asoc_init); | |
469 | module_exit(playpaq_asoc_exit); | |
470 | ||
471 | MODULE_AUTHOR("Geoffrey Wossum <gwossum@acm.org>"); | |
472 | MODULE_DESCRIPTION("ASoC machine driver for LRS PlayPaq"); | |
473 | MODULE_LICENSE("GPL"); |