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Linux/sound/soc/samsung/s3c2412-i2s.c

  1 /* sound/soc/samsung/s3c2412-i2s.c
  2  *
  3  * ALSA Soc Audio Layer - S3C2412 I2S driver
  4  *
  5  * Copyright (c) 2006 Wolfson Microelectronics PLC.
  6  *      Graeme Gregory graeme.gregory@wolfsonmicro.com
  7  *      linux@wolfsonmicro.com
  8  *
  9  * Copyright (c) 2007, 2004-2005 Simtec Electronics
 10  *      http://armlinux.simtec.co.uk/
 11  *      Ben Dooks <ben@simtec.co.uk>
 12  *
 13  * This program is free software; you can redistribute  it and/or modify it
 14  * under  the terms of  the GNU General  Public License as published by the
 15  * Free Software Foundation;  either version 2 of the  License, or (at your
 16  * option) any later version.
 17  */
 18 
 19 #include <linux/delay.h>
 20 #include <linux/gpio.h>
 21 #include <linux/clk.h>
 22 #include <linux/io.h>
 23 #include <linux/module.h>
 24 
 25 #include <sound/soc.h>
 26 #include <sound/pcm_params.h>
 27 
 28 #include <mach/gpio-samsung.h>
 29 #include <plat/gpio-cfg.h>
 30 
 31 #include "dma.h"
 32 #include "regs-i2s-v2.h"
 33 #include "s3c2412-i2s.h"
 34 
 35 #include <linux/platform_data/asoc-s3c.h>
 36 
 37 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
 38         .ch_name        = "tx",
 39         .dma_size       = 4,
 40 };
 41 
 42 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
 43         .ch_name        = "rx",
 44         .dma_size       = 4,
 45 };
 46 
 47 static struct s3c_i2sv2_info s3c2412_i2s;
 48 
 49 static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
 50 {
 51         int ret;
 52 
 53         pr_debug("Entered %s\n", __func__);
 54 
 55         samsung_asoc_init_dma_data(dai, &s3c2412_i2s_pcm_stereo_out,
 56                 &s3c2412_i2s_pcm_stereo_in);
 57 
 58         ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
 59         if (ret)
 60                 return ret;
 61 
 62         s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
 63         s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
 64 
 65         s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk");
 66         if (IS_ERR(s3c2412_i2s.iis_cclk)) {
 67                 pr_err("failed to get i2sclk clock\n");
 68                 return PTR_ERR(s3c2412_i2s.iis_cclk);
 69         }
 70 
 71         /* Set MPLL as the source for IIS CLK */
 72 
 73         clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
 74         clk_prepare_enable(s3c2412_i2s.iis_cclk);
 75 
 76         s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
 77 
 78         /* Configure the I2S pins (GPE0...GPE4) in correct mode */
 79         s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
 80                               S3C_GPIO_PULL_NONE);
 81 
 82         return 0;
 83 }
 84 
 85 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
 86 {
 87         clk_disable_unprepare(s3c2412_i2s.iis_cclk);
 88 
 89         return 0;
 90 }
 91 
 92 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
 93                                  struct snd_pcm_hw_params *params,
 94                                  struct snd_soc_dai *cpu_dai)
 95 {
 96         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 97         u32 iismod;
 98 
 99         pr_debug("Entered %s\n", __func__);
100 
101         iismod = readl(i2s->regs + S3C2412_IISMOD);
102         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
103 
104         switch (params_width(params)) {
105         case 8:
106                 iismod |= S3C2412_IISMOD_8BIT;
107                 break;
108         case 16:
109                 iismod &= ~S3C2412_IISMOD_8BIT;
110                 break;
111         }
112 
113         writel(iismod, i2s->regs + S3C2412_IISMOD);
114         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
115 
116         return 0;
117 }
118 
119 #define S3C2412_I2S_RATES \
120         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
121         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
122         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
123 
124 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
125         .hw_params      = s3c2412_i2s_hw_params,
126 };
127 
128 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
129         .probe          = s3c2412_i2s_probe,
130         .remove = s3c2412_i2s_remove,
131         .playback = {
132                 .channels_min   = 2,
133                 .channels_max   = 2,
134                 .rates          = S3C2412_I2S_RATES,
135                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
136         },
137         .capture = {
138                 .channels_min   = 2,
139                 .channels_max   = 2,
140                 .rates          = S3C2412_I2S_RATES,
141                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
142         },
143         .ops = &s3c2412_i2s_dai_ops,
144 };
145 
146 static const struct snd_soc_component_driver s3c2412_i2s_component = {
147         .name           = "s3c2412-i2s",
148 };
149 
150 static int s3c2412_iis_dev_probe(struct platform_device *pdev)
151 {
152         int ret = 0;
153         struct resource *res;
154         struct s3c_audio_pdata *pdata = dev_get_platdata(&pdev->dev);
155 
156         if (!pdata) {
157                 dev_err(&pdev->dev, "missing platform data");
158                 return -ENXIO;
159         }
160 
161         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
162         s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
163         if (IS_ERR(s3c2412_i2s.regs))
164                 return PTR_ERR(s3c2412_i2s.regs);
165 
166         s3c2412_i2s_pcm_stereo_out.dma_addr = res->start + S3C2412_IISTXD;
167         s3c2412_i2s_pcm_stereo_out.slave = pdata->dma_playback;
168         s3c2412_i2s_pcm_stereo_in.dma_addr = res->start + S3C2412_IISRXD;
169         s3c2412_i2s_pcm_stereo_in.slave = pdata->dma_capture;
170 
171         ret = s3c_i2sv2_register_component(&pdev->dev, -1,
172                                            &s3c2412_i2s_component,
173                                            &s3c2412_i2s_dai);
174         if (ret) {
175                 pr_err("failed to register the dai\n");
176                 return ret;
177         }
178 
179         ret = samsung_asoc_dma_platform_register(&pdev->dev,
180                                                  pdata->dma_filter);
181         if (ret)
182                 pr_err("failed to register the DMA: %d\n", ret);
183 
184         return ret;
185 }
186 
187 static struct platform_driver s3c2412_iis_driver = {
188         .probe  = s3c2412_iis_dev_probe,
189         .driver = {
190                 .name = "s3c2412-iis",
191         },
192 };
193 
194 module_platform_driver(s3c2412_iis_driver);
195 
196 /* Module information */
197 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
198 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
199 MODULE_LICENSE("GPL");
200 MODULE_ALIAS("platform:s3c2412-iis");
201 

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