• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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, SMDK6440, SMDK6450 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 
smdk_wm8580_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)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 	/* Set the codec DAI configuration */
66 	ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_DSP_B
67 				| SND_SOC_DAIFMT_IB_NF
68 				| SND_SOC_DAIFMT_CBS_CFS);
69 	if (ret < 0)
70 		return ret;
71 
72 	/* Set the cpu DAI configuration */
73 	ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_DSP_B
74 				| SND_SOC_DAIFMT_IB_NF
75 				| SND_SOC_DAIFMT_CBS_CFS);
76 	if (ret < 0)
77 		return ret;
78 
79 	if (mclk_freq == xtal_freq) {
80 		ret = snd_soc_dai_set_sysclk(codec_dai, WM8580_CLKSRC_MCLK,
81 						mclk_freq, SND_SOC_CLOCK_IN);
82 		if (ret < 0)
83 			return ret;
84 
85 		ret = snd_soc_dai_set_clkdiv(codec_dai, WM8580_MCLK,
86 						WM8580_CLKSRC_MCLK);
87 		if (ret < 0)
88 			return ret;
89 	} else {
90 		ret = snd_soc_dai_set_sysclk(codec_dai, WM8580_CLKSRC_PLLA,
91 						mclk_freq, SND_SOC_CLOCK_IN);
92 		if (ret < 0)
93 			return ret;
94 
95 		ret = snd_soc_dai_set_clkdiv(codec_dai, WM8580_MCLK,
96 						WM8580_CLKSRC_PLLA);
97 		if (ret < 0)
98 			return ret;
99 
100 		ret = snd_soc_dai_set_pll(codec_dai, WM8580_PLLA, 0,
101 						xtal_freq, mclk_freq);
102 		if (ret < 0)
103 			return ret;
104 	}
105 
106 	/* Set PCM source clock on CPU */
107 	ret = snd_soc_dai_set_sysclk(cpu_dai, S3C_PCM_CLKSRC_MUX,
108 					mclk_freq, SND_SOC_CLOCK_IN);
109 	if (ret < 0)
110 		return ret;
111 
112 	/* Set SCLK_DIV for making bclk */
113 	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C_PCM_SCLK_PER_FS, rfs);
114 	if (ret < 0)
115 		return ret;
116 
117 	return 0;
118 }
119 
120 static struct snd_soc_ops smdk_wm8580_pcm_ops = {
121 	.hw_params = smdk_wm8580_pcm_hw_params,
122 };
123 
124 static struct snd_soc_dai_link smdk_dai[] = {
125 	{
126 		.name = "WM8580 PAIF PCM RX",
127 		.stream_name = "Playback",
128 		.cpu_dai_name = "samsung-pcm.0",
129 		.codec_dai_name = "wm8580-hifi-playback",
130 		.platform_name = "samsung-audio",
131 		.codec_name = "wm8580.0-001b",
132 		.ops = &smdk_wm8580_pcm_ops,
133 	}, {
134 		.name = "WM8580 PAIF PCM TX",
135 		.stream_name = "Capture",
136 		.cpu_dai_name = "samsung-pcm.0",
137 		.codec_dai_name = "wm8580-hifi-capture",
138 		.platform_name = "samsung-pcm.0",
139 		.codec_name = "wm8580.0-001b",
140 		.ops = &smdk_wm8580_pcm_ops,
141 	},
142 };
143 
144 static struct snd_soc_card smdk_pcm = {
145 	.name = "SMDK-PCM",
146 	.owner = THIS_MODULE,
147 	.dai_link = smdk_dai,
148 	.num_links = 2,
149 };
150 
151 /*
152  * After SMDKC110 Base Board's Rev is '0.1', 12MHz External OSC(X1)
153  * is absent (or not connected), so we connect EXT_VOICE_CLK(OSC4),
154  * 2.0484Mhz, directly with MCLK both Codec and SoC.
155  */
snd_smdk_probe(struct platform_device * pdev)156 static int snd_smdk_probe(struct platform_device *pdev)
157 {
158 	int ret = 0;
159 
160 	xtal_freq = SMDK_WM8580_EXT_OSC;
161 	mclk_freq = SMDK_WM8580_EXT_MCLK;
162 
163 	if (machine_is_smdkc110() || machine_is_smdkv210())
164 		xtal_freq = mclk_freq = SMDK_WM8580_EXT_VOICE;
165 
166 	smdk_pcm.dev = &pdev->dev;
167 	ret = snd_soc_register_card(&smdk_pcm);
168 	if (ret) {
169 		dev_err(&pdev->dev, "snd_soc_register_card failed %d\n", ret);
170 		return ret;
171 	}
172 
173 	return 0;
174 }
175 
snd_smdk_remove(struct platform_device * pdev)176 static int snd_smdk_remove(struct platform_device *pdev)
177 {
178 	snd_soc_unregister_card(&smdk_pcm);
179 	platform_set_drvdata(pdev, NULL);
180 	return 0;
181 }
182 
183 static struct platform_driver snd_smdk_driver = {
184 	.driver = {
185 		.owner = THIS_MODULE,
186 		.name = "samsung-smdk-pcm",
187 	},
188 	.probe = snd_smdk_probe,
189 	.remove = snd_smdk_remove,
190 };
191 
192 module_platform_driver(snd_smdk_driver);
193 
194 MODULE_AUTHOR("Sangbeom Kim, <sbkim73@samsung.com>");
195 MODULE_DESCRIPTION("ALSA SoC SMDK WM8580 for PCM");
196 MODULE_LICENSE("GPL");
197