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>
39 #include <linux/i2c.h>
41 #include <linux/atmel-ssc.h>
43 #include <sound/core.h>
44 #include <sound/pcm.h>
45 #include <sound/pcm_params.h>
46 #include <sound/soc.h>
47 #include <sound/soc-dapm.h>
49 #include <asm/mach-types.h>
50 #include <mach/hardware.h>
51 #include <mach/gpio.h>
53 #include "../codecs/wm8731.h"
54 #include "atmel-pcm.h"
55 #include "atmel_ssc_dai.h"
57 #define MCLK_RATE 12000000
59 static struct clk *mclk;
61 static int at91sam9g20ek_startup(struct snd_pcm_substream *substream)
63 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
64 struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
67 ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK,
68 MCLK_RATE, SND_SOC_CLOCK_IN);
77 static void at91sam9g20ek_shutdown(struct snd_pcm_substream *substream)
79 struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
81 dev_dbg(rtd->socdev->dev, "shutdown");
84 static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream,
85 struct snd_pcm_hw_params *params)
87 struct snd_soc_pcm_runtime *rtd = substream->private_data;
88 struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
89 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
90 struct atmel_ssc_info *ssc_p = cpu_dai->private_data;
91 struct ssc_device *ssc = ssc_p->ssc;
98 printk(KERN_INFO "at91sam9g20ek_hw_params: ssc is NULL!\n");
102 /* set codec DAI configuration */
103 ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
104 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
108 /* set cpu DAI configuration */
109 ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
110 SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
115 * The SSC clock dividers depend on the sample rate. The CMR.DIV
116 * field divides the system master clock MCK to drive the SSC TK
117 * signal which provides the codec BCLK. The TCMR.PERIOD and
118 * RCMR.PERIOD fields further divide the BCLK signal to drive
119 * the SSC TF and RF signals which provide the codec DACLRC and
122 * The dividers were determined through trial and error, where a
123 * CMR.DIV value is chosen such that the resulting BCLK value is
124 * divisible, or almost divisible, by (2 * sample rate), and then
125 * the TCMR.PERIOD or RCMR.PERIOD is BCLK / (2 * sample rate) - 1.
127 rate = params_rate(params);
131 cmr_div = 55; /* BCLK = 133MHz/(2*55) = 1.209MHz */
132 period = 74; /* LRC = BCLK/(2*(74+1)) ~= 8060,6Hz */
135 cmr_div = 67; /* BCLK = 133MHz/(2*60) = 1.108MHz */
136 period = 45; /* LRC = BCLK/(2*(49+1)) = 11083,3Hz */
139 cmr_div = 63; /* BCLK = 133MHz/(2*63) = 1.055MHz */
140 period = 32; /* LRC = BCLK/(2*(32+1)) = 15993,2Hz */
143 cmr_div = 52; /* BCLK = 133MHz/(2*52) = 1.278MHz */
144 period = 28; /* LRC = BCLK/(2*(28+1)) = 22049Hz */
147 cmr_div = 66; /* BCLK = 133MHz/(2*66) = 1.007MHz */
148 period = 15; /* LRC = BCLK/(2*(15+1)) = 31486,742Hz */
151 cmr_div = 29; /* BCLK = 133MHz/(2*29) = 2.293MHz */
152 period = 25; /* LRC = BCLK/(2*(25+1)) = 44098Hz */
155 cmr_div = 33; /* BCLK = 133MHz/(2*33) = 2.015MHz */
156 period = 20; /* LRC = BCLK/(2*(20+1)) = 47979,79Hz */
159 cmr_div = 29; /* BCLK = 133MHz/(2*29) = 2.293MHz */
160 period = 12; /* LRC = BCLK/(2*(12+1)) = 88196Hz */
163 cmr_div = 23; /* BCLK = 133MHz/(2*23) = 2.891MHz */
164 period = 14; /* LRC = BCLK/(2*(14+1)) = 96376Hz */
167 printk(KERN_WARNING "unsupported rate %d"
168 " on at91sam9g20ek board\n", rate);
172 /* set the MCK divider for BCLK */
173 ret = snd_soc_dai_set_clkdiv(cpu_dai, ATMEL_SSC_CMR_DIV, cmr_div);
177 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
178 /* set the BCLK divider for DACLRC */
179 ret = snd_soc_dai_set_clkdiv(cpu_dai,
180 ATMEL_SSC_TCMR_PERIOD, period);
182 /* set the BCLK divider for ADCLRC */
183 ret = snd_soc_dai_set_clkdiv(cpu_dai,
184 ATMEL_SSC_RCMR_PERIOD, period);
192 static struct snd_soc_ops at91sam9g20ek_ops = {
193 .startup = at91sam9g20ek_startup,
194 .hw_params = at91sam9g20ek_hw_params,
195 .shutdown = at91sam9g20ek_shutdown,
198 static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
199 enum snd_soc_bias_level level)
205 case SND_SOC_BIAS_ON:
206 case SND_SOC_BIAS_PREPARE:
208 ret = clk_enable(mclk);
213 case SND_SOC_BIAS_OFF:
214 case SND_SOC_BIAS_STANDBY:
224 static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
225 SND_SOC_DAPM_MIC("Int Mic", NULL),
226 SND_SOC_DAPM_SPK("Ext Spk", NULL),
229 static const struct snd_soc_dapm_route intercon[] = {
231 /* speaker connected to LHPOUT */
232 {"Ext Spk", NULL, "LHPOUT"},
234 /* mic is connected to Mic Jack, with WM8731 Mic Bias */
235 {"MICIN", NULL, "Mic Bias"},
236 {"Mic Bias", NULL, "Int Mic"},
240 * Logic for a wm8731 as connected on a at91sam9g20ek board.
242 static int at91sam9g20ek_wm8731_init(struct snd_soc_codec *codec)
245 "at91sam9g20ek_wm8731 "
246 ": at91sam9g20ek_wm8731_init() called\n");
248 /* Add specific widgets */
249 snd_soc_dapm_new_controls(codec, at91sam9g20ek_dapm_widgets,
250 ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
251 /* Set up specific audio path interconnects */
252 snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
255 snd_soc_dapm_nc_pin(codec, "RLINEIN");
256 snd_soc_dapm_nc_pin(codec, "LLINEIN");
258 /* always connected */
259 snd_soc_dapm_enable_pin(codec, "Int Mic");
260 snd_soc_dapm_enable_pin(codec, "Ext Spk");
262 snd_soc_dapm_sync(codec);
267 static struct snd_soc_dai_link at91sam9g20ek_dai = {
269 .stream_name = "WM8731 PCM",
270 .cpu_dai = &atmel_ssc_dai[0],
271 .codec_dai = &wm8731_dai,
272 .init = at91sam9g20ek_wm8731_init,
273 .ops = &at91sam9g20ek_ops,
276 static struct snd_soc_card snd_soc_at91sam9g20ek = {
277 .name = "AT91SAMG20-EK",
278 .platform = &atmel_soc_platform,
279 .dai_link = &at91sam9g20ek_dai,
281 .set_bias_level = at91sam9g20ek_set_bias_level,
285 * FIXME: This is a temporary bodge to avoid cross-tree merge issues.
286 * New drivers should register the wm8731 I2C device in the machine
287 * setup code (under arch/arm for ARM systems).
289 static int wm8731_i2c_register(void)
291 struct i2c_board_info info;
292 struct i2c_adapter *adapter;
293 struct i2c_client *client;
295 memset(&info, 0, sizeof(struct i2c_board_info));
297 strlcpy(info.type, "wm8731", I2C_NAME_SIZE);
299 adapter = i2c_get_adapter(0);
301 printk(KERN_ERR "can't get i2c adapter 0\n");
305 client = i2c_new_device(adapter, &info);
306 i2c_put_adapter(adapter);
308 printk(KERN_ERR "can't add i2c device at 0x%x\n",
309 (unsigned int)info.addr);
316 static struct snd_soc_device at91sam9g20ek_snd_devdata = {
317 .card = &snd_soc_at91sam9g20ek,
318 .codec_dev = &soc_codec_dev_wm8731,
321 static struct platform_device *at91sam9g20ek_snd_device;
323 static int __init at91sam9g20ek_init(void)
325 struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
326 struct ssc_device *ssc = NULL;
330 if (!machine_is_at91sam9g20ek())
334 * Codec MCLK is supplied by PCK0 - set it up.
336 mclk = clk_get(NULL, "pck0");
338 printk(KERN_ERR "ASoC: Failed to get MCLK\n");
343 pllb = clk_get(NULL, "pllb");
345 printk(KERN_ERR "ASoC: Failed to get PLLB\n");
349 ret = clk_set_parent(mclk, pllb);
352 printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
356 clk_set_rate(mclk, MCLK_RATE);
361 ssc = ssc_request(0);
363 printk(KERN_ERR "ASoC: Failed to request SSC 0\n");
370 ret = wm8731_i2c_register();
374 at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
375 if (!at91sam9g20ek_snd_device) {
376 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
380 platform_set_drvdata(at91sam9g20ek_snd_device,
381 &at91sam9g20ek_snd_devdata);
382 at91sam9g20ek_snd_devdata.dev = &at91sam9g20ek_snd_device->dev;
384 ret = platform_device_add(at91sam9g20ek_snd_device);
386 printk(KERN_ERR "ASoC: Platform device allocation failed\n");
387 platform_device_put(at91sam9g20ek_snd_device);
402 static void __exit at91sam9g20ek_exit(void)
404 struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data;
405 struct ssc_device *ssc;
414 platform_device_unregister(at91sam9g20ek_snd_device);
415 at91sam9g20ek_snd_device = NULL;
420 module_init(at91sam9g20ek_init);
421 module_exit(at91sam9g20ek_exit);
423 /* Module information */
424 MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
425 MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
426 MODULE_LICENSE("GPL");