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9aaca968 GW |
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/version.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/clk.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/interrupt.h> | |
31 | #include <linux/platform_device.h> | |
32 | ||
33 | #include <sound/core.h> | |
34 | #include <sound/pcm.h> | |
35 | #include <sound/pcm_params.h> | |
36 | #include <sound/soc.h> | |
37 | #include <sound/soc-dapm.h> | |
38 | ||
39 | #include <asm/arch/at32ap700x.h> | |
40 | #include <asm/arch/portmux.h> | |
41 | ||
42 | #include "../codecs/wm8510.h" | |
43 | #include "at32-pcm.h" | |
44 | #include "at32-ssc.h" | |
45 | ||
46 | ||
47 | /*-------------------------------------------------------------------------*\ | |
48 | * constants | |
49 | \*-------------------------------------------------------------------------*/ | |
50 | #define MCLK_PIN GPIO_PIN_PA(30) | |
51 | #define MCLK_PERIPH GPIO_PERIPH_A | |
52 | ||
53 | ||
54 | /*-------------------------------------------------------------------------*\ | |
55 | * data types | |
56 | \*-------------------------------------------------------------------------*/ | |
57 | /* SSC clocking data */ | |
58 | struct ssc_clock_data { | |
59 | /* CMR div */ | |
60 | unsigned int cmr_div; | |
61 | ||
62 | /* Frame period (as needed by xCMR.PERIOD) */ | |
63 | unsigned int period; | |
64 | ||
65 | /* The SSC clock rate these settings where calculated for */ | |
66 | unsigned long ssc_rate; | |
67 | }; | |
68 | ||
69 | ||
70 | /*-------------------------------------------------------------------------*\ | |
71 | * module data | |
72 | \*-------------------------------------------------------------------------*/ | |
73 | static struct clk *_gclk0; | |
74 | static struct clk *_pll0; | |
75 | ||
76 | #define CODEC_CLK (_gclk0) | |
77 | ||
78 | ||
79 | /*-------------------------------------------------------------------------*\ | |
80 | * Sound SOC operations | |
81 | \*-------------------------------------------------------------------------*/ | |
82 | #if defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE | |
83 | static struct ssc_clock_data playpaq_wm8510_calc_ssc_clock( | |
84 | struct snd_pcm_hw_params *params, | |
85 | struct snd_soc_cpu_dai *cpu_dai) | |
86 | { | |
87 | struct at32_ssc_info *ssc_p = cpu_dai->private_data; | |
88 | struct ssc_device *ssc = ssc_p->ssc; | |
89 | struct ssc_clock_data cd; | |
90 | unsigned int rate, width_bits, channels; | |
91 | unsigned int bitrate, ssc_div; | |
92 | unsigned actual_rate; | |
93 | ||
94 | ||
95 | /* | |
96 | * Figure out required bitrate | |
97 | */ | |
98 | rate = params_rate(params); | |
99 | channels = params_channels(params); | |
100 | width_bits = snd_pcm_format_physical_width(params_format(params)); | |
101 | bitrate = rate * width_bits * channels; | |
102 | ||
103 | ||
104 | /* | |
105 | * Figure out required SSC divider and period for required bitrate | |
106 | */ | |
107 | cd.ssc_rate = clk_get_rate(ssc->clk); | |
108 | ssc_div = cd.ssc_rate / bitrate; | |
109 | cd.cmr_div = ssc_div / 2; | |
110 | if (ssc_div & 1) { | |
111 | /* round cmr_div up */ | |
112 | cd.cmr_div++; | |
113 | } | |
114 | cd.period = width_bits - 1; | |
115 | ||
116 | ||
117 | /* | |
118 | * Find actual rate, compare to requested rate | |
119 | */ | |
120 | actual_rate = (cd.ssc_rate / (cd.cmr_div * 2)) / (2 * (cd.period + 1)); | |
121 | pr_debug("playpaq_wm8510: Request rate = %d, actual rate = %d\n", | |
122 | rate, actual_rate); | |
123 | ||
124 | ||
125 | return cd; | |
126 | } | |
127 | #endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */ | |
128 | ||
129 | ||
130 | ||
131 | static int playpaq_wm8510_hw_params(struct snd_pcm_substream *substream, | |
132 | struct snd_pcm_hw_params *params) | |
133 | { | |
134 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
135 | struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai; | |
136 | struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai; | |
137 | struct at32_ssc_info *ssc_p = cpu_dai->private_data; | |
138 | struct ssc_device *ssc = ssc_p->ssc; | |
139 | unsigned int pll_out = 0, bclk = 0, mclk_div = 0; | |
140 | int ret; | |
141 | ||
142 | ||
143 | /* Due to difficulties with getting the correct clocks from the AT32's | |
144 | * PLL0, we're going to let the CODEC be in charge of all the clocks | |
145 | */ | |
146 | #if !defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE | |
147 | const unsigned int fmt = (SND_SOC_DAIFMT_I2S | | |
148 | SND_SOC_DAIFMT_NB_NF | | |
149 | SND_SOC_DAIFMT_CBM_CFM); | |
150 | #else | |
151 | struct ssc_clock_data cd; | |
152 | const unsigned int fmt = (SND_SOC_DAIFMT_I2S | | |
153 | SND_SOC_DAIFMT_NB_NF | | |
154 | SND_SOC_DAIFMT_CBS_CFS); | |
155 | #endif | |
156 | ||
157 | if (ssc == NULL) { | |
158 | pr_warning("playpaq_wm8510_hw_params: ssc is NULL!\n"); | |
159 | return -EINVAL; | |
160 | } | |
161 | ||
162 | ||
163 | /* | |
164 | * Figure out PLL and BCLK dividers for WM8510 | |
165 | */ | |
166 | switch (params_rate(params)) { | |
167 | case 48000: | |
168 | pll_out = 12288000; | |
169 | mclk_div = WM8510_MCLKDIV_1; | |
170 | bclk = WM8510_BCLKDIV_8; | |
171 | break; | |
172 | ||
173 | case 44100: | |
174 | pll_out = 11289600; | |
175 | mclk_div = WM8510_MCLKDIV_1; | |
176 | bclk = WM8510_BCLKDIV_8; | |
177 | break; | |
178 | ||
179 | case 22050: | |
180 | pll_out = 11289600; | |
181 | mclk_div = WM8510_MCLKDIV_2; | |
182 | bclk = WM8510_BCLKDIV_8; | |
183 | break; | |
184 | ||
185 | case 16000: | |
186 | pll_out = 12288000; | |
187 | mclk_div = WM8510_MCLKDIV_3; | |
188 | bclk = WM8510_BCLKDIV_8; | |
189 | break; | |
190 | ||
191 | case 11025: | |
192 | pll_out = 11289600; | |
193 | mclk_div = WM8510_MCLKDIV_4; | |
194 | bclk = WM8510_BCLKDIV_8; | |
195 | break; | |
196 | ||
197 | case 8000: | |
198 | pll_out = 12288000; | |
199 | mclk_div = WM8510_MCLKDIV_6; | |
200 | bclk = WM8510_BCLKDIV_8; | |
201 | break; | |
202 | ||
203 | default: | |
204 | pr_warning("playpaq_wm8510: Unsupported sample rate %d\n", | |
205 | params_rate(params)); | |
206 | return -EINVAL; | |
207 | } | |
208 | ||
209 | ||
210 | /* | |
211 | * set CPU and CODEC DAI configuration | |
212 | */ | |
213 | ret = codec_dai->dai_ops.set_fmt(codec_dai, fmt); | |
214 | if (ret < 0) { | |
215 | pr_warning("playpaq_wm8510: " | |
216 | "Failed to set CODEC DAI format (%d)\n", | |
217 | ret); | |
218 | return ret; | |
219 | } | |
220 | ret = cpu_dai->dai_ops.set_fmt(cpu_dai, fmt); | |
221 | if (ret < 0) { | |
222 | pr_warning("playpaq_wm8510: " | |
223 | "Failed to set CPU DAI format (%d)\n", | |
224 | ret); | |
225 | return ret; | |
226 | } | |
227 | ||
228 | ||
229 | /* | |
230 | * Set CPU clock configuration | |
231 | */ | |
232 | #if defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE | |
233 | cd = playpaq_wm8510_calc_ssc_clock(params, cpu_dai); | |
234 | pr_debug("playpaq_wm8510: cmr_div = %d, period = %d\n", | |
235 | cd.cmr_div, cd.period); | |
236 | ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, | |
237 | AT32_SSC_CMR_DIV, cd.cmr_div); | |
238 | if (ret < 0) { | |
239 | pr_warning("playpaq_wm8510: Failed to set CPU CMR_DIV (%d)\n", | |
240 | ret); | |
241 | return ret; | |
242 | } | |
243 | ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, AT32_SSC_TCMR_PERIOD, | |
244 | cd.period); | |
245 | if (ret < 0) { | |
246 | pr_warning("playpaq_wm8510: " | |
247 | "Failed to set CPU transmit period (%d)\n", | |
248 | ret); | |
249 | return ret; | |
250 | } | |
251 | #endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */ | |
252 | ||
253 | ||
254 | /* | |
255 | * Set CODEC clock configuration | |
256 | */ | |
257 | pr_debug("playpaq_wm8510: " | |
258 | "pll_in = %ld, pll_out = %u, bclk = %x, mclk = %x\n", | |
259 | clk_get_rate(CODEC_CLK), pll_out, bclk, mclk_div); | |
260 | ||
261 | ||
262 | #if !defined CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE | |
263 | ret = codec_dai->dai_ops.set_clkdiv(codec_dai, WM8510_BCLKDIV, bclk); | |
264 | if (ret < 0) { | |
265 | pr_warning | |
266 | ("playpaq_wm8510: Failed to set CODEC DAI BCLKDIV (%d)\n", | |
267 | ret); | |
268 | return ret; | |
269 | } | |
270 | #endif /* CONFIG_SND_AT32_SOC_PLAYPAQ_SLAVE */ | |
271 | ||
272 | ||
273 | ret = codec_dai->dai_ops.set_pll(codec_dai, 0, | |
274 | clk_get_rate(CODEC_CLK), pll_out); | |
275 | if (ret < 0) { | |
276 | pr_warning("playpaq_wm8510: Failed to set CODEC DAI PLL (%d)\n", | |
277 | ret); | |
278 | return ret; | |
279 | } | |
280 | ||
281 | ||
282 | ret = codec_dai->dai_ops.set_clkdiv(codec_dai, | |
283 | WM8510_MCLKDIV, mclk_div); | |
284 | if (ret < 0) { | |
285 | pr_warning("playpaq_wm8510: Failed to set CODEC MCLKDIV (%d)\n", | |
286 | ret); | |
287 | return ret; | |
288 | } | |
289 | ||
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
294 | ||
295 | ||
296 | static struct snd_soc_ops playpaq_wm8510_ops = { | |
297 | .hw_params = playpaq_wm8510_hw_params, | |
298 | }; | |
299 | ||
300 | ||
301 | ||
302 | static const struct snd_soc_dapm_widget playpaq_dapm_widgets[] = { | |
303 | SND_SOC_DAPM_MIC("Int Mic", NULL), | |
304 | SND_SOC_DAPM_SPK("Ext Spk", NULL), | |
305 | }; | |
306 | ||
307 | ||
308 | ||
309 | static const char *intercon[][3] = { | |
310 | /* speaker connected to SPKOUT */ | |
311 | {"Ext Spk", NULL, "SPKOUTP"}, | |
312 | {"Ext Spk", NULL, "SPKOUTN"}, | |
313 | ||
314 | {"Mic Bias", NULL, "Int Mic"}, | |
315 | {"MICN", NULL, "Mic Bias"}, | |
316 | {"MICP", NULL, "Mic Bias"}, | |
317 | ||
318 | /* Terminator */ | |
319 | {NULL, NULL, NULL}, | |
320 | }; | |
321 | ||
322 | ||
323 | ||
324 | static int playpaq_wm8510_init(struct snd_soc_codec *codec) | |
325 | { | |
326 | int i; | |
327 | ||
328 | /* | |
329 | * Add DAPM widgets | |
330 | */ | |
331 | for (i = 0; i < ARRAY_SIZE(playpaq_dapm_widgets); i++) | |
332 | snd_soc_dapm_new_control(codec, &playpaq_dapm_widgets[i]); | |
333 | ||
334 | ||
335 | ||
336 | /* | |
337 | * Setup audio path interconnects | |
338 | */ | |
339 | for (i = 0; intercon[i][0] != NULL; i++) { | |
340 | snd_soc_dapm_connect_input(codec, | |
341 | intercon[i][0], | |
342 | intercon[i][1], intercon[i][2]); | |
343 | } | |
344 | ||
345 | ||
346 | /* always connected endpoints */ | |
347 | snd_soc_dapm_set_endpoint(codec, "Int Mic", 1); | |
348 | snd_soc_dapm_set_endpoint(codec, "Ext Spk", 1); | |
349 | snd_soc_dapm_sync_endpoints(codec); | |
350 | ||
351 | ||
352 | ||
353 | /* Make CSB show PLL rate */ | |
354 | codec->dai->dai_ops.set_clkdiv(codec->dai, WM8510_OPCLKDIV, | |
355 | WM8510_OPCLKDIV_1 | 4); | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | ||
361 | ||
362 | static struct snd_soc_dai_link playpaq_wm8510_dai = { | |
363 | .name = "WM8510", | |
364 | .stream_name = "WM8510 PCM", | |
365 | .cpu_dai = &at32_ssc_dai[0], | |
366 | .codec_dai = &wm8510_dai, | |
367 | .init = playpaq_wm8510_init, | |
368 | .ops = &playpaq_wm8510_ops, | |
369 | }; | |
370 | ||
371 | ||
372 | ||
373 | static struct snd_soc_machine snd_soc_machine_playpaq = { | |
374 | .name = "LRS_PlayPaq_WM8510", | |
375 | .dai_link = &playpaq_wm8510_dai, | |
376 | .num_links = 1, | |
377 | }; | |
378 | ||
379 | ||
380 | ||
381 | static struct wm8510_setup_data playpaq_wm8510_setup = { | |
382 | .i2c_address = 0x1a, | |
383 | }; | |
384 | ||
385 | ||
386 | ||
387 | static struct snd_soc_device playpaq_wm8510_snd_devdata = { | |
388 | .machine = &snd_soc_machine_playpaq, | |
389 | .platform = &at32_soc_platform, | |
390 | .codec_dev = &soc_codec_dev_wm8510, | |
391 | .codec_data = &playpaq_wm8510_setup, | |
392 | }; | |
393 | ||
394 | static struct platform_device *playpaq_snd_device; | |
395 | ||
396 | ||
397 | static int __init playpaq_asoc_init(void) | |
398 | { | |
399 | int ret = 0; | |
400 | struct at32_ssc_info *ssc_p = playpaq_wm8510_dai.cpu_dai->private_data; | |
401 | struct ssc_device *ssc = NULL; | |
402 | ||
403 | ||
404 | /* | |
405 | * Request SSC device | |
406 | */ | |
407 | ssc = ssc_request(0); | |
408 | if (IS_ERR(ssc)) { | |
409 | ret = PTR_ERR(ssc); | |
410 | ssc = NULL; | |
411 | goto err_ssc; | |
412 | } | |
413 | ssc_p->ssc = ssc; | |
414 | ||
415 | ||
416 | /* | |
417 | * Configure MCLK for WM8510 | |
418 | */ | |
419 | _gclk0 = clk_get(NULL, "gclk0"); | |
420 | if (IS_ERR(_gclk0)) { | |
421 | _gclk0 = NULL; | |
422 | goto err_gclk0; | |
423 | } | |
424 | _pll0 = clk_get(NULL, "pll0"); | |
425 | if (IS_ERR(_pll0)) { | |
426 | _pll0 = NULL; | |
427 | goto err_pll0; | |
428 | } | |
429 | if (clk_set_parent(_gclk0, _pll0)) { | |
430 | pr_warning("snd-soc-playpaq: " | |
431 | "Failed to set PLL0 as parent for DAC clock\n"); | |
432 | goto err_set_clk; | |
433 | } | |
434 | clk_set_rate(CODEC_CLK, 12000000); | |
435 | clk_enable(CODEC_CLK); | |
436 | ||
437 | #if defined CONFIG_AT32_ENHANCED_PORTMUX | |
438 | at32_select_periph(MCLK_PIN, MCLK_PERIPH, 0); | |
439 | #endif | |
440 | ||
441 | ||
442 | /* | |
443 | * Create and register platform device | |
444 | */ | |
445 | playpaq_snd_device = platform_device_alloc("soc-audio", 0); | |
446 | if (playpaq_snd_device == NULL) { | |
447 | ret = -ENOMEM; | |
448 | goto err_device_alloc; | |
449 | } | |
450 | ||
451 | platform_set_drvdata(playpaq_snd_device, &playpaq_wm8510_snd_devdata); | |
452 | playpaq_wm8510_snd_devdata.dev = &playpaq_snd_device->dev; | |
453 | ||
454 | ret = platform_device_add(playpaq_snd_device); | |
455 | if (ret) { | |
456 | pr_warning("playpaq_wm8510: platform_device_add failed (%d)\n", | |
457 | ret); | |
458 | goto err_device_add; | |
459 | } | |
460 | ||
461 | return 0; | |
462 | ||
463 | ||
464 | err_device_add: | |
465 | if (playpaq_snd_device != NULL) { | |
466 | platform_device_put(playpaq_snd_device); | |
467 | playpaq_snd_device = NULL; | |
468 | } | |
469 | err_device_alloc: | |
470 | err_set_clk: | |
471 | if (_pll0 != NULL) { | |
472 | clk_put(_pll0); | |
473 | _pll0 = NULL; | |
474 | } | |
475 | err_pll0: | |
476 | if (_gclk0 != NULL) { | |
477 | clk_put(_gclk0); | |
478 | _gclk0 = NULL; | |
479 | } | |
480 | err_gclk0: | |
481 | if (ssc != NULL) { | |
482 | ssc_free(ssc); | |
483 | ssc = NULL; | |
484 | } | |
485 | err_ssc: | |
486 | return ret; | |
487 | } | |
488 | ||
489 | ||
490 | static void __exit playpaq_asoc_exit(void) | |
491 | { | |
492 | struct at32_ssc_info *ssc_p = playpaq_wm8510_dai.cpu_dai->private_data; | |
493 | struct ssc_device *ssc; | |
494 | ||
495 | if (ssc_p != NULL) { | |
496 | ssc = ssc_p->ssc; | |
497 | if (ssc != NULL) | |
498 | ssc_free(ssc); | |
499 | ssc_p->ssc = NULL; | |
500 | } | |
501 | ||
502 | if (_gclk0 != NULL) { | |
503 | clk_put(_gclk0); | |
504 | _gclk0 = NULL; | |
505 | } | |
506 | if (_pll0 != NULL) { | |
507 | clk_put(_pll0); | |
508 | _pll0 = NULL; | |
509 | } | |
510 | ||
511 | #if defined CONFIG_AT32_ENHANCED_PORTMUX | |
512 | at32_free_pin(MCLK_PIN); | |
513 | #endif | |
514 | ||
515 | platform_device_unregister(playpaq_snd_device); | |
516 | playpaq_snd_device = NULL; | |
517 | } | |
518 | ||
519 | module_init(playpaq_asoc_init); | |
520 | module_exit(playpaq_asoc_exit); | |
521 | ||
522 | MODULE_AUTHOR("Geoffrey Wossum <gwossum@acm.org>"); | |
523 | MODULE_DESCRIPTION("ASoC machine driver for LRS PlayPaq"); | |
524 | MODULE_LICENSE("GPL"); |