sound/soc/samsung/smdk_wm8580pcm.c

   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
  36 static unsigned long mclk_freq;
  37 static 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
  46 static 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
 106 static 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
 113 static 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
 135 static 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  */
 147 static 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
 165 static struct platform_driver snd_smdk_driver = {
 166         .driver = {
 167                 .name = "samsung-smdk-pcm",
 168         },
 169         .probe = snd_smdk_probe,
 170 };
 171
 172 module_platform_driver(snd_smdk_driver);
 173
 174 MODULE_AUTHOR("Sangbeom Kim, <sbkim73@samsung.com>");
 175 MODULE_DESCRIPTION("ALSA SoC SMDK WM8580 for PCM");
 176 MODULE_LICENSE("GPL");