sound/soc/samsung/s3c2412-i2s.c

   1 // SPDX-License-Identifier: GPL-2.0+
   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 #include <linux/delay.h>
  14 #include <linux/gpio.h>
  15 #include <linux/clk.h>
  16 #include <linux/io.h>
  17 #include <linux/module.h>
  18
  19 #include <sound/soc.h>
  20 #include <sound/pcm_params.h>
  21
  22 #include <mach/gpio-samsung.h>
  23 #include <plat/gpio-cfg.h>
  24
  25 #include "dma.h"
  26 #include "regs-i2s-v2.h"
  27 #include "s3c2412-i2s.h"
  28
  29 #include <linux/platform_data/asoc-s3c.h>
  30
  31 static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_out = {
  32         .chan_name      = "tx",
  33         .addr_width     = 4,
  34 };
  35
  36 static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_in = {
  37         .chan_name      = "rx",
  38         .addr_width     = 4,
  39 };
  40
  41 static struct s3c_i2sv2_info s3c2412_i2s;
  42
  43 static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
  44 {
  45         int ret;
  46
  47         pr_debug("Entered %s\n", __func__);
  48
  49         snd_soc_dai_init_dma_data(dai, &s3c2412_i2s_pcm_stereo_out,
  50                                         &s3c2412_i2s_pcm_stereo_in);
  51
  52         ret = s3c_i2sv2_probe(dai, &s3c2412_i2s, S3C2410_PA_IIS);
  53         if (ret)
  54                 return ret;
  55
  56         s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
  57         s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
  58
  59         s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk");
  60         if (IS_ERR(s3c2412_i2s.iis_cclk)) {
  61                 pr_err("failed to get i2sclk clock\n");
  62                 ret = PTR_ERR(s3c2412_i2s.iis_cclk);
  63                 goto err;
  64         }
  65
  66         /* Set MPLL as the source for IIS CLK */
  67
  68         clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
  69         ret = clk_prepare_enable(s3c2412_i2s.iis_cclk);
  70         if (ret)
  71                 goto err;
  72
  73         /* Configure the I2S pins (GPE0...GPE4) in correct mode */
  74         s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
  75                               S3C_GPIO_PULL_NONE);
  76
  77         return 0;
  78
  79 err:
  80         s3c_i2sv2_cleanup(dai, &s3c2412_i2s);
  81
  82         return ret;
  83 }
  84
  85 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
  86 {
  87         clk_disable_unprepare(s3c2412_i2s.iis_cclk);
  88         s3c_i2sv2_cleanup(dai, &s3c2412_i2s);
  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         struct s3c_audio_pdata *pdata = dev_get_platdata(&pdev->dev);
 156
 157         if (!pdata) {
 158                 dev_err(&pdev->dev, "missing platform data");
 159                 return -ENXIO;
 160         }
 161
 162         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 163         s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
 164         if (IS_ERR(s3c2412_i2s.regs))
 165                 return PTR_ERR(s3c2412_i2s.regs);
 166
 167         s3c2412_i2s_pcm_stereo_out.addr = res->start + S3C2412_IISTXD;
 168         s3c2412_i2s_pcm_stereo_out.filter_data = pdata->dma_playback;
 169         s3c2412_i2s_pcm_stereo_in.addr = res->start + S3C2412_IISRXD;
 170         s3c2412_i2s_pcm_stereo_in.filter_data = pdata->dma_capture;
 171
 172         ret = samsung_asoc_dma_platform_register(&pdev->dev,
 173                                                  pdata->dma_filter,
 174                                                  "tx", "rx", NULL);
 175         if (ret) {
 176                 pr_err("failed to register the DMA: %d\n", ret);
 177                 return ret;
 178         }
 179
 180         ret = s3c_i2sv2_register_component(&pdev->dev, -1,
 181                                            &s3c2412_i2s_component,
 182                                            &s3c2412_i2s_dai);
 183         if (ret)
 184                 pr_err("failed to register the dai\n");
 185
 186         return ret;
 187 }
 188
 189 static struct platform_driver s3c2412_iis_driver = {
 190         .probe  = s3c2412_iis_dev_probe,
 191         .driver = {
 192                 .name = "s3c2412-iis",
 193         },
 194 };
 195
 196 module_platform_driver(s3c2412_iis_driver);
 197
 198 /* Module information */
 199 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 200 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
 201 MODULE_LICENSE("GPL");
 202 MODULE_ALIAS("platform:s3c2412-iis");