LXR linux/sound/soc/samsung/smdk

   1/*
   2 *  sound/soc/samsung/smdk_wm8580pcm.c
   3 *
   4 *  Copyright (c) 2011 Samsung Electronics Co. Ltd
   5 *
   6 *  This program is free software; you can redistribute  it and/or  modify it
   7 *  under  the terms of  the GNU General  Public License as published by the
   8 *  Free Software Foundation;  either version 2 of the  License, or (at your
   9 *  option) any later version.
  10 */
  11#include <linux/module.h>
  12#include <sound/soc.h>
  13#include <sound/pcm_params.h>
  14#include <sound/pcm.h>
  15
  16#include <asm/mach-types.h>
  17
  18#include "../codecs/wm8580.h"
  19#include "dma.h"
  20#include "pcm.h"
  21
  22/*
  23 * Board Settings:
  24 *  o '1' means 'ON'
  25 *  o '0' means 'OFF'
  26 *  o 'X' means 'Don't care'
  27 *
  28 * SMDK6410 Base B/D: CFG1-0000, CFG2-1111
  29 * SMDKC110, SMDKV210: CFGB11-100100, CFGB12-0000
  30 */
  31
  32#define SMDK_WM8580_EXT_OSC 12000000
  33#define SMDK_WM8580_EXT_MCLK 4096000
  34#define SMDK_WM8580_EXT_VOICE 2048000
  35
  36static unsigned long mclk_freq;
  37static unsigned long xtal_freq;
  38
  39/*
  40 * If MCLK clock directly gets from XTAL, we don't have to use PLL
  41 * to make MCLK, but if XTAL clock source connects with other codec
  42 * pin (like XTI), we should have to set codec's PLL to make MCLK.
  43 * Because Samsung SoC does not support pcmcdclk output like I2S.
  44 */
  45
  46static int smdk_wm8580_pcm_hw_params(struct snd_pcm_substream *substream,
  47                              struct snd_pcm_hw_params *params)
  48{
  49        struct snd_soc_pcm_runtime *rtd = substream->private_data;
  50        struct snd_soc_dai *codec_dai = rtd->codec_dai;
  51        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  52        int rfs, ret;
  53
  54        switch (params_rate(params)) {
  55        case 8000:
  56                break;
  57        default:
  58                printk(KERN_ERR "%s:%d Sampling Rate %u not supported!\n",
  59                __func__, __LINE__, params_rate(params));
  60                return -EINVAL;
  61        }
  62
  63        rfs = mclk_freq / params_rate(params) / 2;
  64
  65        if (mclk_freq == xtal_freq) {
  66                ret = snd_soc_dai_set_sysclk(codec_dai, WM8580_CLKSRC_MCLK,
  67                                                mclk_freq, SND_SOC_CLOCK_IN);
  68                if (ret < 0)
  69                        return ret;
  70
  71                ret = snd_soc_dai_set_clkdiv(codec_dai, WM8580_MCLK,
  72                                                WM8580_CLKSRC_MCLK);
  73                if (ret < 0)
  74                        return ret;
  75        } else {
  76                ret = snd_soc_dai_set_sysclk(codec_dai, WM8580_CLKSRC_PLLA,
  77                                                mclk_freq, SND_SOC_CLOCK_IN);
  78                if (ret < 0)
  79                        return ret;
  80
  81                ret = snd_soc_dai_set_clkdiv(codec_dai, WM8580_MCLK,
  82                                                WM8580_CLKSRC_PLLA);
  83                if (ret < 0)
  84                        return ret;
  85
  86                ret = snd_soc_dai_set_pll(codec_dai, WM8580_PLLA, 0,
  87                                                xtal_freq, mclk_freq);
  88                if (ret < 0)
  89                        return ret;
  90        }
  91
  92        /* Set PCM source clock on CPU */
  93        ret = snd_soc_dai_set_sysclk(cpu_dai, S3C_PCM_CLKSRC_MUX,
  94                                        mclk_freq, SND_SOC_CLOCK_IN);
  95        if (ret < 0)
  96                return ret;
  97
  98        /* Set SCLK_DIV for making bclk */
  99        ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C_PCM_SCLK_PER_FS, rfs);
 100        if (ret < 0)
 101                return ret;
 102
 103        return 0;
 104}
 105
 106static struct snd_soc_ops smdk_wm8580_pcm_ops = {
 107        .hw_params = smdk_wm8580_pcm_hw_params,
 108};
 109
 110#define SMDK_DAI_FMT (SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_IB_NF | \
 111        SND_SOC_DAIFMT_CBS_CFS)
 112
 113static struct snd_soc_dai_link smdk_dai[] = {
 114        {
 115                .name = "WM8580 PAIF PCM RX",
 116                .stream_name = "Playback",
 117                .cpu_dai_name = "samsung-pcm.0",
 118                .codec_dai_name = "wm8580-hifi-playback",
 119                .platform_name = "samsung-audio",
 120                .codec_name = "wm8580.0-001b",
 121                .dai_fmt = SMDK_DAI_FMT,
 122                .ops = &smdk_wm8580_pcm_ops,
 123        }, {
 124                .name = "WM8580 PAIF PCM TX",
 125                .stream_name = "Capture",
 126                .cpu_dai_name = "samsung-pcm.0",
 127                .codec_dai_name = "wm8580-hifi-capture",
 128                .platform_name = "samsung-pcm.0",
 129                .codec_name = "wm8580.0-001b",
 130                .dai_fmt = SMDK_DAI_FMT,
 131                .ops = &smdk_wm8580_pcm_ops,
 132        },
 133};
 134
 135static struct snd_soc_card smdk_pcm = {
 136        .name = "SMDK-PCM",
 137        .owner = THIS_MODULE,
 138        .dai_link = smdk_dai,
 139        .num_links = 2,
 140};
 141
 142/*
 143 * After SMDKC110 Base Board's Rev is '0.1', 12MHz External OSC(X1)
 144 * is absent (or not connected), so we connect EXT_VOICE_CLK(OSC4),
 145 * 2.0484Mhz, directly with MCLK both Codec and SoC.
 146 */
 147static int snd_smdk_probe(struct platform_device *pdev)
 148{
 149        int ret = 0;
 150
 151        xtal_freq = SMDK_WM8580_EXT_OSC;
 152        mclk_freq = SMDK_WM8580_EXT_MCLK;
 153
 154        if (machine_is_smdkc110() || machine_is_smdkv210())
 155                xtal_freq = mclk_freq = SMDK_WM8580_EXT_VOICE;
 156
 157        smdk_pcm.dev = &pdev->dev;
 158        ret = devm_snd_soc_register_card(&pdev->dev, &smdk_pcm);
 159        if (ret)
 160                dev_err(&pdev->dev, "snd_soc_register_card failed %d\n", ret);
 161
 162        return ret;
 163}
 164
 165static struct platform_driver snd_smdk_driver = {
 166        .driver = {
 167                .name = "samsung-smdk-pcm",
 168        },
 169        .probe = snd_smdk_probe,
 170};
 171
 172module_platform_driver(snd_smdk_driver);
 173
 174MODULE_AUTHOR("Sangbeom Kim, <sbkim73@samsung.com>");
 175MODULE_DESCRIPTION("ALSA SoC SMDK WM8580 for PCM");
 176MODULE_LICENSE("GPL");
 177