/* * sam9g20_wm8731 -- SoC audio for AT91SAM9G20-based * ATMEL AT91SAM9G20ek board. * * Copyright (C) 2005 SAN People * Copyright (C) 2008 Atmel * * Authors: Sedji Gaouaou * * Based on ati_b1_wm8731.c by: * Frank Mandarino * Copyright 2006 Endrelia Technologies Inc. * Based on corgi.c by: * Copyright 2005 Wolfson Microelectronics PLC. * Copyright 2005 Openedhand Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "../codecs/wm8731.h" #include "atmel-pcm.h" #include "atmel_ssc_dai.h" #define MCLK_RATE 12000000 static struct clk *mclk; static int at91sam9g20ek_startup(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream); struct snd_soc_dai *codec_dai = rtd->dai->codec_dai; int ret; ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK, MCLK_RATE, SND_SOC_CLOCK_IN); if (ret < 0) { clk_disable(mclk); return ret; } return 0; } static void at91sam9g20ek_shutdown(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream); dev_dbg(rtd->socdev->dev, "shutdown"); } static int at91sam9g20ek_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_soc_dai *codec_dai = rtd->dai->codec_dai; struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai; struct atmel_ssc_info *ssc_p = cpu_dai->private_data; struct ssc_device *ssc = ssc_p->ssc; int ret; unsigned int rate; int cmr_div, period; if (ssc == NULL) { printk(KERN_INFO "at91sam9g20ek_hw_params: ssc is NULL!\n"); return -EINVAL; } /* set codec DAI configuration */ ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS); if (ret < 0) return ret; /* set cpu DAI configuration */ ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS); if (ret < 0) return ret; /* * The SSC clock dividers depend on the sample rate. The CMR.DIV * field divides the system master clock MCK to drive the SSC TK * signal which provides the codec BCLK. The TCMR.PERIOD and * RCMR.PERIOD fields further divide the BCLK signal to drive * the SSC TF and RF signals which provide the codec DACLRC and * ADCLRC clocks. * * The dividers were determined through trial and error, where a * CMR.DIV value is chosen such that the resulting BCLK value is * divisible, or almost divisible, by (2 * sample rate), and then * the TCMR.PERIOD or RCMR.PERIOD is BCLK / (2 * sample rate) - 1. */ rate = params_rate(params); switch (rate) { case 8000: cmr_div = 55; /* BCLK = 133MHz/(2*55) = 1.209MHz */ period = 74; /* LRC = BCLK/(2*(74+1)) ~= 8060,6Hz */ break; case 11025: cmr_div = 67; /* BCLK = 133MHz/(2*60) = 1.108MHz */ period = 45; /* LRC = BCLK/(2*(49+1)) = 11083,3Hz */ break; case 16000: cmr_div = 63; /* BCLK = 133MHz/(2*63) = 1.055MHz */ period = 32; /* LRC = BCLK/(2*(32+1)) = 15993,2Hz */ break; case 22050: cmr_div = 52; /* BCLK = 133MHz/(2*52) = 1.278MHz */ period = 28; /* LRC = BCLK/(2*(28+1)) = 22049Hz */ break; case 32000: cmr_div = 66; /* BCLK = 133MHz/(2*66) = 1.007MHz */ period = 15; /* LRC = BCLK/(2*(15+1)) = 31486,742Hz */ break; case 44100: cmr_div = 29; /* BCLK = 133MHz/(2*29) = 2.293MHz */ period = 25; /* LRC = BCLK/(2*(25+1)) = 44098Hz */ break; case 48000: cmr_div = 33; /* BCLK = 133MHz/(2*33) = 2.015MHz */ period = 20; /* LRC = BCLK/(2*(20+1)) = 47979,79Hz */ break; case 88200: cmr_div = 29; /* BCLK = 133MHz/(2*29) = 2.293MHz */ period = 12; /* LRC = BCLK/(2*(12+1)) = 88196Hz */ break; case 96000: cmr_div = 23; /* BCLK = 133MHz/(2*23) = 2.891MHz */ period = 14; /* LRC = BCLK/(2*(14+1)) = 96376Hz */ break; default: printk(KERN_WARNING "unsupported rate %d" " on at91sam9g20ek board\n", rate); return -EINVAL; } /* set the MCK divider for BCLK */ ret = snd_soc_dai_set_clkdiv(cpu_dai, ATMEL_SSC_CMR_DIV, cmr_div); if (ret < 0) return ret; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { /* set the BCLK divider for DACLRC */ ret = snd_soc_dai_set_clkdiv(cpu_dai, ATMEL_SSC_TCMR_PERIOD, period); } else { /* set the BCLK divider for ADCLRC */ ret = snd_soc_dai_set_clkdiv(cpu_dai, ATMEL_SSC_RCMR_PERIOD, period); } if (ret < 0) return ret; return 0; } static struct snd_soc_ops at91sam9g20ek_ops = { .startup = at91sam9g20ek_startup, .hw_params = at91sam9g20ek_hw_params, .shutdown = at91sam9g20ek_shutdown, }; static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card, enum snd_soc_bias_level level) { static int mclk_on; int ret = 0; switch (level) { case SND_SOC_BIAS_ON: case SND_SOC_BIAS_PREPARE: if (!mclk_on) ret = clk_enable(mclk); if (ret == 0) mclk_on = 1; break; case SND_SOC_BIAS_OFF: case SND_SOC_BIAS_STANDBY: if (mclk_on) clk_disable(mclk); mclk_on = 0; break; } return ret; } static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = { SND_SOC_DAPM_MIC("Int Mic", NULL), SND_SOC_DAPM_SPK("Ext Spk", NULL), }; static const struct snd_soc_dapm_route intercon[] = { /* speaker connected to LHPOUT */ {"Ext Spk", NULL, "LHPOUT"}, /* mic is connected to Mic Jack, with WM8731 Mic Bias */ {"MICIN", NULL, "Mic Bias"}, {"Mic Bias", NULL, "Int Mic"}, }; /* * Logic for a wm8731 as connected on a at91sam9g20ek board. */ static int at91sam9g20ek_wm8731_init(struct snd_soc_codec *codec) { printk(KERN_DEBUG "at91sam9g20ek_wm8731 " ": at91sam9g20ek_wm8731_init() called\n"); /* Add specific widgets */ snd_soc_dapm_new_controls(codec, at91sam9g20ek_dapm_widgets, ARRAY_SIZE(at91sam9g20ek_dapm_widgets)); /* Set up specific audio path interconnects */ snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon)); /* not connected */ snd_soc_dapm_nc_pin(codec, "RLINEIN"); snd_soc_dapm_nc_pin(codec, "LLINEIN"); /* always connected */ snd_soc_dapm_enable_pin(codec, "Int Mic"); snd_soc_dapm_enable_pin(codec, "Ext Spk"); snd_soc_dapm_sync(codec); return 0; } static struct snd_soc_dai_link at91sam9g20ek_dai = { .name = "WM8731", .stream_name = "WM8731 PCM", .cpu_dai = &atmel_ssc_dai[0], .codec_dai = &wm8731_dai, .init = at91sam9g20ek_wm8731_init, .ops = &at91sam9g20ek_ops, }; static struct snd_soc_card snd_soc_at91sam9g20ek = { .name = "AT91SAMG20-EK", .platform = &atmel_soc_platform, .dai_link = &at91sam9g20ek_dai, .num_links = 1, .set_bias_level = at91sam9g20ek_set_bias_level, }; static struct wm8731_setup_data at91sam9g20ek_wm8731_setup = { .i2c_bus = 0, .i2c_address = 0x1b, }; static struct snd_soc_device at91sam9g20ek_snd_devdata = { .card = &snd_soc_at91sam9g20ek, .codec_dev = &soc_codec_dev_wm8731, .codec_data = &at91sam9g20ek_wm8731_setup, }; static struct platform_device *at91sam9g20ek_snd_device; static int __init at91sam9g20ek_init(void) { struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data; struct ssc_device *ssc = NULL; struct clk *pllb; int ret; if (!machine_is_at91sam9g20ek()) return -ENODEV; /* * Codec MCLK is supplied by PCK0 - set it up. */ mclk = clk_get(NULL, "pck0"); if (IS_ERR(mclk)) { printk(KERN_ERR "ASoC: Failed to get MCLK\n"); ret = PTR_ERR(mclk); goto err; } pllb = clk_get(NULL, "pllb"); if (IS_ERR(mclk)) { printk(KERN_ERR "ASoC: Failed to get PLLB\n"); ret = PTR_ERR(mclk); goto err_mclk; } ret = clk_set_parent(mclk, pllb); clk_put(pllb); if (ret != 0) { printk(KERN_ERR "ASoC: Failed to set MCLK parent\n"); goto err_mclk; } clk_set_rate(mclk, MCLK_RATE); /* * Request SSC device */ ssc = ssc_request(0); if (IS_ERR(ssc)) { printk(KERN_ERR "ASoC: Failed to request SSC 0\n"); ret = PTR_ERR(ssc); ssc = NULL; goto err_ssc; } ssc_p->ssc = ssc; at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1); if (!at91sam9g20ek_snd_device) { printk(KERN_ERR "ASoC: Platform device allocation failed\n"); ret = -ENOMEM; } platform_set_drvdata(at91sam9g20ek_snd_device, &at91sam9g20ek_snd_devdata); at91sam9g20ek_snd_devdata.dev = &at91sam9g20ek_snd_device->dev; ret = platform_device_add(at91sam9g20ek_snd_device); if (ret) { printk(KERN_ERR "ASoC: Platform device allocation failed\n"); platform_device_put(at91sam9g20ek_snd_device); } return ret; err_ssc: err_mclk: clk_put(mclk); mclk = NULL; err: return ret; } static void __exit at91sam9g20ek_exit(void) { struct atmel_ssc_info *ssc_p = at91sam9g20ek_dai.cpu_dai->private_data; struct ssc_device *ssc; if (ssc_p != NULL) { ssc = ssc_p->ssc; if (ssc != NULL) ssc_free(ssc); ssc_p->ssc = NULL; } platform_device_unregister(at91sam9g20ek_snd_device); at91sam9g20ek_snd_device = NULL; clk_put(mclk); mclk = NULL; } module_init(at91sam9g20ek_init); module_exit(at91sam9g20ek_exit); /* Module information */ MODULE_AUTHOR("Sedji Gaouaou "); MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731"); MODULE_LICENSE("GPL");