2 * sam9g20_wm8731 -- SoC audio for AT91SAM9G20-based
3 * ATMEL AT91SAM9G20ek board.
5 * Copyright (C) 2005 SAN People
6 * Copyright (C) 2008 Atmel
8 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
10 * Based on ati_b1_wm8731.c by:
11 * Frank Mandarino <fmandarino@endrelia.com>
12 * Copyright 2006 Endrelia Technologies Inc.
13 * Based on corgi.c by:
14 * Copyright 2005 Wolfson Microelectronics PLC.
15 * Copyright 2005 Openedhand Ltd.
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or
20 * (at your option) any later version.
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 #include <linux/module.h>
33 #include <linux/moduleparam.h>
34 #include <linux/kernel.h>
35 #include <linux/clk.h>
36 #include <linux/timer.h>
37 #include <linux/interrupt.h>
38 #include <linux/platform_device.h>
40 #include <linux/atmel-ssc.h>
42 #include <sound/core.h>
43 #include <sound/pcm.h>
44 #include <sound/pcm_params.h>
45 #include <sound/soc.h>
46 #include <sound/soc-dapm.h>
48 #include <asm/mach-types.h>
49 #include <mach/hardware.h>
50 #include <mach/gpio.h>
52 #include "../codecs/wm8731.h"
53 #include "atmel-pcm.h"
54 #include "atmel_ssc_dai.h"
56 #define MCLK_RATE 12000000
58 static struct clk *mclk;
60 static int at91sam9g20ek_startup(struct snd_pcm_substream *substream)
62 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
63 struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
66 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK,
67 MCLK_RATE, SND_SOC_CLOCK_IN);
76 static void at91sam9g20ek_shutdown(struct snd_pcm_substream *substream)
78 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
80 dev_dbg(rtd->socdev->dev, "shutdown");
83 static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
84 struct snd_pcm_hw_params *params)
86 struct snd_soc_pcm_runtime *rtd = substream->private_data;
87 struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
88 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
89 struct atmel_ssc_info *ssc_p = cpu_dai->private_data;
90 struct ssc_device *ssc = ssc_p->ssc;
97 printk(KERN_INFO "at91sam9g20ek_hw_params: ssc is NULL!\n");
101 /* set codec DAI configuration */
102 ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
103 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
107 /* set cpu DAI configuration */
108 ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
109 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
114 * The SSC clock dividers depend on the sample rate. The CMR.DIV
115 * field divides the system master clock MCK to drive the SSC TK
116 * signal which provides the codec BCLK. The TCMR.PERIOD and
117 * RCMR.PERIOD fields further divide the BCLK signal to drive
118 * the SSC TF and RF signals which provide the codec DACLRC and
121 * The dividers were determined through trial and error, where a
122 * CMR.DIV value is chosen such that the resulting BCLK value is
123 * divisible, or almost divisible, by (2 * sample rate), and then
124 * the TCMR.PERIOD or RCMR.PERIOD is BCLK / (2 * sample rate) - 1.
126 rate = params_rate(params);
130 cmr_div = 55; /* BCLK = 133MHz/(2*55) = 1.209MHz */
131 period = 74; /* LRC = BCLK/(2*(74+1)) ~= 8060,6Hz */
134 cmr_div = 67; /* BCLK = 133MHz/(2*60) = 1.108MHz */
135 period = 45; /* LRC = BCLK/(2*(49+1)) = 11083,3Hz */
138 cmr_div = 63; /* BCLK = 133MHz/(2*63) = 1.055MHz */
139 period = 32; /* LRC = BCLK/(2*(32+1)) = 15993,2Hz */
142 cmr_div = 52; /* BCLK = 133MHz/(2*52) = 1.278MHz */
143 period = 28; /* LRC = BCLK/(2*(28+1)) = 22049Hz */
146 cmr_div = 66; /* BCLK = 133MHz/(2*66) = 1.007MHz */
147 period = 15; /* LRC = BCLK/(2*(15+1)) = 31486,742Hz */
150 cmr_div = 29; /* BCLK = 133MHz/(2*29) = 2.293MHz */
151 period = 25; /* LRC = BCLK/(2*(25+1)) = 44098Hz */
154 cmr_div = 33; /* BCLK = 133MHz/(2*33) = 2.015MHz */
155 period = 20; /* LRC = BCLK/(2*(20+1)) = 47979,79Hz */
158 cmr_div = 29; /* BCLK = 133MHz/(2*29) = 2.293MHz */
159 period = 12; /* LRC = BCLK/(2*(12+1)) = 88196Hz */
162 cmr_div = 23; /* BCLK = 133MHz/(2*23) = 2.891MHz */
163 period = 14; /* LRC = BCLK/(2*(14+1)) = 96376Hz */
166 printk(KERN_WARNING "unsupported rate %d"
167 " on at91sam9g20ek board\n", rate);
171 /* set the MCK divider for BCLK */
172 ret = snd_soc_dai_set_clkdiv(cpu_dai, ATMEL_SSC_CMR_DIV, cmr_div);
176 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
177 /* set the BCLK divider for DACLRC */
178 ret = snd_soc_dai_set_clkdiv(cpu_dai,
179 ATMEL_SSC_TCMR_PERIOD, period);
181 /* set the BCLK divider for ADCLRC */
182 ret = snd_soc_dai_set_clkdiv(cpu_dai,
183 ATMEL_SSC_RCMR_PERIOD, period);
191 static struct snd_soc_ops at91sam9g20ek_ops = {
192 .startup = at91sam9g20ek_startup,
193 .hw_params = at91sam9g20ek_hw_params,
194 .shutdown = at91sam9g20ek_shutdown,
197 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
198 enum snd_soc_bias_level level)
204 case SND_SOC_BIAS_ON:
205 case SND_SOC_BIAS_PREPARE:
207 ret = clk_enable(mclk);
212 case SND_SOC_BIAS_OFF:
213 case SND_SOC_BIAS_STANDBY:
223 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
224 SND_SOC_DAPM_MIC("Int Mic", NULL),
225 SND_SOC_DAPM_SPK("Ext Spk", NULL),
228 static const struct snd_soc_dapm_route intercon[] = {
230 /* speaker connected to LHPOUT */
231 {"Ext Spk", NULL, "LHPOUT"},
233 /* mic is connected to Mic Jack, with WM8731 Mic Bias */
234 {"MICIN", NULL, "Mic Bias"},
235 {"Mic Bias", NULL, "Int Mic"},
239 * Logic for a wm8731 as connected on a at91sam9g20ek board.
241 static int at91sam9g20ek_wm8731_init(struct snd_soc_codec *codec)
244 "at91sam9g20ek_wm8731 "
245 ": at91sam9g20ek_wm8731_init() called\n");
247 /* Add specific widgets */
248 snd_soc_dapm_new_controls(codec, at91sam9g20ek_dapm_widgets,
249 ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
250 /* Set up specific audio path interconnects */
251 snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
254 snd_soc_dapm_nc_pin(codec, "RLINEIN");
255 snd_soc_dapm_nc_pin(codec, "LLINEIN");
257 /* always connected */
258 snd_soc_dapm_enable_pin(codec, "Int Mic");
259 snd_soc_dapm_enable_pin(codec, "Ext Spk");
261 snd_soc_dapm_sync(codec);
266 static struct snd_soc_dai_link at91sam9g20ek_dai = {
268 .stream_name = "WM8731 PCM",
269 .cpu_dai = &atmel_ssc_dai[0],
270 .codec_dai = &wm8731_dai,
271 .init = at91sam9g20ek_wm8731_init,
272 .ops = &at91sam9g20ek_ops,
275 static struct snd_soc_card snd_soc_at91sam9g20ek = {
276 .name = "AT91SAMG20-EK",
277 .platform = &atmel_soc_platform,
278 .dai_link = &at91sam9g20ek_dai,
280 .set_bias_level = at91sam9g20ek_set_bias_level,
283 static struct wm8731_setup_data at91sam9g20ek_wm8731_setup = {
288 static struct snd_soc_device at91sam9g20ek_snd_devdata = {
289 .card = &snd_soc_at91sam9g20ek,
290 .codec_dev = &soc_codec_dev_wm8731,
291 .codec_data = &at91sam9g20ek_wm8731_setup,
294 static struct platform_device *at91sam9g20ek_snd_device;
296 static int __init at91sam9g20ek_init(void)
298 struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
299 struct ssc_device *ssc = NULL;
303 if (!machine_is_at91sam9g20ek())
307 * Codec MCLK is supplied by PCK0 - set it up.
309 mclk = clk_get(NULL, "pck0");
311 printk(KERN_ERR "ASoC: Failed to get MCLK\n");
316 pllb = clk_get(NULL, "pllb");
318 printk(KERN_ERR "ASoC: Failed to get PLLB\n");
322 ret = clk_set_parent(mclk, pllb);
325 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
329 clk_set_rate(mclk, MCLK_RATE);
334 ssc = ssc_request(0);
336 printk(KERN_ERR "ASoC: Failed to request SSC 0\n");
343 at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
344 if (!at91sam9g20ek_snd_device) {
345 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
349 platform_set_drvdata(at91sam9g20ek_snd_device,
350 &at91sam9g20ek_snd_devdata);
351 at91sam9g20ek_snd_devdata.dev = &at91sam9g20ek_snd_device->dev;
353 ret = platform_device_add(at91sam9g20ek_snd_device);
355 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
356 platform_device_put(at91sam9g20ek_snd_device);
369 static void __exit at91sam9g20ek_exit(void)
371 struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
372 struct ssc_device *ssc;
381 platform_device_unregister(at91sam9g20ek_snd_device);
382 at91sam9g20ek_snd_device = NULL;
387 module_init(at91sam9g20ek_init);
388 module_exit(at91sam9g20ek_exit);
390 /* Module information */
391 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
392 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
393 MODULE_LICENSE("GPL");