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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/dma.h>
 29 #include <mach/gpio-samsung.h>
 30 #include <plat/gpio-cfg.h>
 31 
 32 #include "dma.h"
 33 #include "regs-i2s-v2.h"
 34 #include "s3c2412-i2s.h"
 35 
 36 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_out = {
 37         .channel        = DMACH_I2S_OUT,
 38         .ch_name        = "tx",
 39         .dma_size       = 4,
 40 };
 41 
 42 static struct s3c_dma_params s3c2412_i2s_pcm_stereo_in = {
 43         .channel        = DMACH_I2S_IN,
 44         .ch_name        = "rx",
 45         .dma_size       = 4,
 46 };
 47 
 48 static struct s3c_i2sv2_info s3c2412_i2s;
 49 
 50 static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
 51 {
 52         int ret;
 53 
 54         pr_debug("Entered %s\n", __func__);
 55 
 56         samsung_asoc_init_dma_data(dai, &s3c2412_i2s_pcm_stereo_out,
 57                 &s3c2412_i2s_pcm_stereo_in);
 58 
 59         ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
 60         if (ret)
 61                 return ret;
 62 
 63         s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
 64         s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
 65 
 66         s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk");
 67         if (IS_ERR(s3c2412_i2s.iis_cclk)) {
 68                 pr_err("failed to get i2sclk clock\n");
 69                 return PTR_ERR(s3c2412_i2s.iis_cclk);
 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         clk_prepare_enable(s3c2412_i2s.iis_cclk);
 76 
 77         s3c2412_i2s.iis_cclk = s3c2412_i2s.iis_pclk;
 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 
 86 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
 87 {
 88         clk_disable_unprepare(s3c2412_i2s.iis_cclk);
 89 
 90         return 0;
 91 }
 92 
 93 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
 94                                  struct snd_pcm_hw_params *params,
 95                                  struct snd_soc_dai *cpu_dai)
 96 {
 97         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 98         u32 iismod;
 99 
100         pr_debug("Entered %s\n", __func__);
101 
102         iismod = readl(i2s->regs + S3C2412_IISMOD);
103         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
104 
105         switch (params_width(params)) {
106         case 8:
107                 iismod |= S3C2412_IISMOD_8BIT;
108                 break;
109         case 16:
110                 iismod &= ~S3C2412_IISMOD_8BIT;
111                 break;
112         }
113 
114         writel(iismod, i2s->regs + S3C2412_IISMOD);
115         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
116 
117         return 0;
118 }
119 
120 #define S3C2412_I2S_RATES \
121         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
122         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
123         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
124 
125 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
126         .hw_params      = s3c2412_i2s_hw_params,
127 };
128 
129 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
130         .probe          = s3c2412_i2s_probe,
131         .remove = s3c2412_i2s_remove,
132         .playback = {
133                 .channels_min   = 2,
134                 .channels_max   = 2,
135                 .rates          = S3C2412_I2S_RATES,
136                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
137         },
138         .capture = {
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         .ops = &s3c2412_i2s_dai_ops,
145 };
146 
147 static const struct snd_soc_component_driver s3c2412_i2s_component = {
148         .name           = "s3c2412-i2s",
149 };
150 
151 static int s3c2412_iis_dev_probe(struct platform_device *pdev)
152 {
153         int ret = 0;
154         struct resource *res;
155 
156         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
157         s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
158         if (IS_ERR(s3c2412_i2s.regs))
159                 return PTR_ERR(s3c2412_i2s.regs);
160 
161         s3c2412_i2s_pcm_stereo_out.dma_addr = res->start + S3C2412_IISTXD;
162         s3c2412_i2s_pcm_stereo_in.dma_addr = res->start + S3C2412_IISRXD;
163 
164         ret = s3c_i2sv2_register_component(&pdev->dev, -1,
165                                            &s3c2412_i2s_component,
166                                            &s3c2412_i2s_dai);
167         if (ret) {
168                 pr_err("failed to register the dai\n");
169                 return ret;
170         }
171 
172         ret = samsung_asoc_dma_platform_register(&pdev->dev);
173         if (ret)
174                 pr_err("failed to register the DMA: %d\n", ret);
175 
176         return ret;
177 }
178 
179 static struct platform_driver s3c2412_iis_driver = {
180         .probe  = s3c2412_iis_dev_probe,
181         .driver = {
182                 .name = "s3c2412-iis",
183                 .owner = THIS_MODULE,
184         },
185 };
186 
187 module_platform_driver(s3c2412_iis_driver);
188 
189 /* Module information */
190 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
191 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
192 MODULE_LICENSE("GPL");
193 MODULE_ALIAS("platform:s3c2412-iis");
194 

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