| /* |
| * sam9g20_wm8731 -- SoC audio for AT91SAM9G20-based |
| * ATMEL AT91SAM9G20ek board. |
| * |
| * Copyright (C) 2005 SAN People |
| * Copyright (C) 2008 Atmel |
| * |
| * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com> |
| * |
| * Based on ati_b1_wm8731.c by: |
| * Frank Mandarino <fmandarino@endrelia.com> |
| * 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 <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/kernel.h> |
| #include <linux/clk.h> |
| #include <linux/timer.h> |
| #include <linux/interrupt.h> |
| #include <linux/platform_device.h> |
| |
| #include <linux/atmel-ssc.h> |
| |
| #include <sound/core.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| #include <sound/soc.h> |
| #include <sound/soc-dapm.h> |
| |
| #include <asm/mach-types.h> |
| #include <mach/hardware.h> |
| #include <mach/gpio.h> |
| |
| #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 = "WM8731", |
| .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 <sedji.gaouaou@atmel.com>"); |
| MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731"); |
| MODULE_LICENSE("GPL"); |