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"
57 static int at91sam9g20ek_startup(struct snd_pcm_substream *substream)
59 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
60 struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
63 /* codec system clock is supplied by PCK0, set to 12MHz */
64 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK,
65 12000000, SND_SOC_CLOCK_IN);
72 static void at91sam9g20ek_shutdown(struct snd_pcm_substream *substream)
74 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
76 dev_dbg(rtd->socdev->dev, "shutdown");
79 static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
80 struct snd_pcm_hw_params *params)
82 struct snd_soc_pcm_runtime *rtd = substream->private_data;
83 struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
84 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
85 struct atmel_ssc_info *ssc_p = cpu_dai->private_data;
86 struct ssc_device *ssc = ssc_p->ssc;
93 printk(KERN_INFO "at91sam9g20ek_hw_params: ssc is NULL!\n");
97 /* set codec DAI configuration */
98 ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
99 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
103 /* set cpu DAI configuration */
104 ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
105 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
110 * The SSC clock dividers depend on the sample rate. The CMR.DIV
111 * field divides the system master clock MCK to drive the SSC TK
112 * signal which provides the codec BCLK. The TCMR.PERIOD and
113 * RCMR.PERIOD fields further divide the BCLK signal to drive
114 * the SSC TF and RF signals which provide the codec DACLRC and
117 * The dividers were determined through trial and error, where a
118 * CMR.DIV value is chosen such that the resulting BCLK value is
119 * divisible, or almost divisible, by (2 * sample rate), and then
120 * the TCMR.PERIOD or RCMR.PERIOD is BCLK / (2 * sample rate) - 1.
122 rate = params_rate(params);
126 cmr_div = 55; /* BCLK = 133MHz/(2*55) = 1.209MHz */
127 period = 74; /* LRC = BCLK/(2*(74+1)) ~= 8060,6Hz */
130 cmr_div = 67; /* BCLK = 133MHz/(2*60) = 1.108MHz */
131 period = 45; /* LRC = BCLK/(2*(49+1)) = 11083,3Hz */
134 cmr_div = 63; /* BCLK = 133MHz/(2*63) = 1.055MHz */
135 period = 32; /* LRC = BCLK/(2*(32+1)) = 15993,2Hz */
138 cmr_div = 52; /* BCLK = 133MHz/(2*52) = 1.278MHz */
139 period = 28; /* LRC = BCLK/(2*(28+1)) = 22049Hz */
142 cmr_div = 66; /* BCLK = 133MHz/(2*66) = 1.007MHz */
143 period = 15; /* LRC = BCLK/(2*(15+1)) = 31486,742Hz */
146 cmr_div = 29; /* BCLK = 133MHz/(2*29) = 2.293MHz */
147 period = 25; /* LRC = BCLK/(2*(25+1)) = 44098Hz */
150 cmr_div = 33; /* BCLK = 133MHz/(2*33) = 2.015MHz */
151 period = 20; /* LRC = BCLK/(2*(20+1)) = 47979,79Hz */
154 cmr_div = 29; /* BCLK = 133MHz/(2*29) = 2.293MHz */
155 period = 12; /* LRC = BCLK/(2*(12+1)) = 88196Hz */
158 cmr_div = 23; /* BCLK = 133MHz/(2*23) = 2.891MHz */
159 period = 14; /* LRC = BCLK/(2*(14+1)) = 96376Hz */
162 printk(KERN_WARNING "unsupported rate %d"
163 " on at91sam9g20ek board\n", rate);
167 /* set the MCK divider for BCLK */
168 ret = snd_soc_dai_set_clkdiv(cpu_dai, ATMEL_SSC_CMR_DIV, cmr_div);
172 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
173 /* set the BCLK divider for DACLRC */
174 ret = snd_soc_dai_set_clkdiv(cpu_dai,
175 ATMEL_SSC_TCMR_PERIOD, period);
177 /* set the BCLK divider for ADCLRC */
178 ret = snd_soc_dai_set_clkdiv(cpu_dai,
179 ATMEL_SSC_RCMR_PERIOD, period);
187 static struct snd_soc_ops at91sam9g20ek_ops = {
188 .startup = at91sam9g20ek_startup,
189 .hw_params = at91sam9g20ek_hw_params,
190 .shutdown = at91sam9g20ek_shutdown,
194 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
195 SND_SOC_DAPM_MIC("Int Mic", NULL),
196 SND_SOC_DAPM_SPK("Ext Spk", NULL),
199 static const struct snd_soc_dapm_route intercon[] = {
201 /* speaker connected to LHPOUT */
202 {"Ext Spk", NULL, "LHPOUT"},
204 /* mic is connected to Mic Jack, with WM8731 Mic Bias */
205 {"MICIN", NULL, "Mic Bias"},
206 {"Mic Bias", NULL, "Int Mic"},
210 * Logic for a wm8731 as connected on a at91sam9g20ek board.
212 static int at91sam9g20ek_wm8731_init(struct snd_soc_codec *codec)
215 "at91sam9g20ek_wm8731 "
216 ": at91sam9g20ek_wm8731_init() called\n");
218 /* Add specific widgets */
219 snd_soc_dapm_new_controls(codec, at91sam9g20ek_dapm_widgets,
220 ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
221 /* Set up specific audio path interconnects */
222 snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
225 snd_soc_dapm_nc_pin(codec, "RLINEIN");
226 snd_soc_dapm_nc_pin(codec, "LLINEIN");
228 /* always connected */
229 snd_soc_dapm_enable_pin(codec, "Int Mic");
230 snd_soc_dapm_enable_pin(codec, "Ext Spk");
232 snd_soc_dapm_sync(codec);
237 static struct snd_soc_dai_link at91sam9g20ek_dai = {
239 .stream_name = "WM8731 PCM",
240 .cpu_dai = &atmel_ssc_dai[0],
241 .codec_dai = &wm8731_dai,
242 .init = at91sam9g20ek_wm8731_init,
243 .ops = &at91sam9g20ek_ops,
246 static struct snd_soc_card snd_soc_at91sam9g20ek = {
248 .platform = &atmel_soc_platform,
249 .dai_link = &at91sam9g20ek_dai,
253 static struct wm8731_setup_data at91sam9g20ek_wm8731_setup = {
258 static struct snd_soc_device at91sam9g20ek_snd_devdata = {
259 .card = &snd_soc_at91sam9g20ek,
260 .codec_dev = &soc_codec_dev_wm8731,
261 .codec_data = &at91sam9g20ek_wm8731_setup,
264 static struct platform_device *at91sam9g20ek_snd_device;
266 static int __init at91sam9g20ek_init(void)
268 struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
269 struct ssc_device *ssc = NULL;
272 if (!machine_is_at91sam9g20ek())
278 ssc = ssc_request(0);
280 printk(KERN_ERR "ASoC: Failed to request SSC 0\n");
287 at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
288 if (!at91sam9g20ek_snd_device) {
289 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
293 platform_set_drvdata(at91sam9g20ek_snd_device,
294 &at91sam9g20ek_snd_devdata);
295 at91sam9g20ek_snd_devdata.dev = &at91sam9g20ek_snd_device->dev;
297 ret = platform_device_add(at91sam9g20ek_snd_device);
299 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
300 platform_device_put(at91sam9g20ek_snd_device);
309 static void __exit at91sam9g20ek_exit(void)
311 struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
312 struct ssc_device *ssc;
321 platform_device_unregister(at91sam9g20ek_snd_device);
322 at91sam9g20ek_snd_device = NULL;
325 module_init(at91sam9g20ek_init);
326 module_exit(at91sam9g20ek_exit);
328 /* Module information */
329 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
330 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
331 MODULE_LICENSE("GPL");