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Linux/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 '' 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");
177 

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