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

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  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 snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_out = {
 38         .chan_name      = "tx",
 39         .addr_width     = 4,
 40 };
 41 
 42 static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_in = {
 43         .chan_name      = "rx",
 44         .addr_width     = 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         snd_soc_dai_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                 ret = PTR_ERR(s3c2412_i2s.iis_cclk);
 69                 goto err;
 70         }
 71 
 72         /* Set MPLL as the source for IIS CLK */
 73 
 74         clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
 75         ret = clk_prepare_enable(s3c2412_i2s.iis_cclk);
 76         if (ret)
 77                 goto err;
 78 
 79         /* Configure the I2S pins (GPE0...GPE4) in correct mode */
 80         s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
 81                               S3C_GPIO_PULL_NONE);
 82 
 83         return 0;
 84 
 85 err:
 86         s3c_i2sv2_cleanup(dai, &s3c2412_i2s);
 87 
 88         return ret;
 89 }
 90 
 91 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
 92 {
 93         clk_disable_unprepare(s3c2412_i2s.iis_cclk);
 94         s3c_i2sv2_cleanup(dai, &s3c2412_i2s);
 95 
 96         return 0;
 97 }
 98 
 99 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
100                                  struct snd_pcm_hw_params *params,
101                                  struct snd_soc_dai *cpu_dai)
102 {
103         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
104         u32 iismod;
105 
106         pr_debug("Entered %s\n", __func__);
107 
108         iismod = readl(i2s->regs + S3C2412_IISMOD);
109         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
110 
111         switch (params_width(params)) {
112         case 8:
113                 iismod |= S3C2412_IISMOD_8BIT;
114                 break;
115         case 16:
116                 iismod &= ~S3C2412_IISMOD_8BIT;
117                 break;
118         }
119 
120         writel(iismod, i2s->regs + S3C2412_IISMOD);
121         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
122 
123         return 0;
124 }
125 
126 #define S3C2412_I2S_RATES \
127         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
128         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
129         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
130 
131 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
132         .hw_params      = s3c2412_i2s_hw_params,
133 };
134 
135 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
136         .probe          = s3c2412_i2s_probe,
137         .remove = s3c2412_i2s_remove,
138         .playback = {
139                 .channels_min   = 2,
140                 .channels_max   = 2,
141                 .rates          = S3C2412_I2S_RATES,
142                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
143         },
144         .capture = {
145                 .channels_min   = 2,
146                 .channels_max   = 2,
147                 .rates          = S3C2412_I2S_RATES,
148                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
149         },
150         .ops = &s3c2412_i2s_dai_ops,
151 };
152 
153 static const struct snd_soc_component_driver s3c2412_i2s_component = {
154         .name           = "s3c2412-i2s",
155 };
156 
157 static int s3c2412_iis_dev_probe(struct platform_device *pdev)
158 {
159         int ret = 0;
160         struct resource *res;
161         struct s3c_audio_pdata *pdata = dev_get_platdata(&pdev->dev);
162 
163         if (!pdata) {
164                 dev_err(&pdev->dev, "missing platform data");
165                 return -ENXIO;
166         }
167 
168         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
169         s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
170         if (IS_ERR(s3c2412_i2s.regs))
171                 return PTR_ERR(s3c2412_i2s.regs);
172 
173         s3c2412_i2s_pcm_stereo_out.addr = res->start + S3C2412_IISTXD;
174         s3c2412_i2s_pcm_stereo_out.filter_data = pdata->dma_playback;
175         s3c2412_i2s_pcm_stereo_in.addr = res->start + S3C2412_IISRXD;
176         s3c2412_i2s_pcm_stereo_in.filter_data = pdata->dma_capture;
177 
178         ret = samsung_asoc_dma_platform_register(&pdev->dev,
179                                                  pdata->dma_filter,
180                                                  "tx", "rx", NULL);
181         if (ret) {
182                 pr_err("failed to register the DMA: %d\n", ret);
183                 return ret;
184         }
185 
186         ret = s3c_i2sv2_register_component(&pdev->dev, -1,
187                                            &s3c2412_i2s_component,
188                                            &s3c2412_i2s_dai);
189         if (ret)
190                 pr_err("failed to register the dai\n");
191 
192         return ret;
193 }
194 
195 static struct platform_driver s3c2412_iis_driver = {
196         .probe  = s3c2412_iis_dev_probe,
197         .driver = {
198                 .name = "s3c2412-iis",
199         },
200 };
201 
202 module_platform_driver(s3c2412_iis_driver);
203 
204 /* Module information */
205 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
206 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
207 MODULE_LICENSE("GPL");
208 MODULE_ALIAS("platform:s3c2412-iis");
209 

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