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 "dma.h"
  23 #include "regs-i2s-v2.h"
  24 #include "s3c2412-i2s.h"
  25
  26 #include <linux/platform_data/asoc-s3c.h>
  27
  28 static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_out = {
  29         .chan_name      = "tx",
  30         .addr_width     = 4,
  31 };
  32
  33 static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_in = {
  34         .chan_name      = "rx",
  35         .addr_width     = 4,
  36 };
  37
  38 static struct s3c_i2sv2_info s3c2412_i2s;
  39
  40 static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
  41 {
  42         int ret;
  43
  44         pr_debug("Entered %s\n", __func__);
  45
  46         snd_soc_dai_init_dma_data(dai, &s3c2412_i2s_pcm_stereo_out,
  47                                         &s3c2412_i2s_pcm_stereo_in);
  48
  49         ret = s3c_i2sv2_probe(dai, &s3c2412_i2s);
  50         if (ret)
  51                 return ret;
  52
  53         s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
  54         s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
  55
  56         s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk");
  57         if (IS_ERR(s3c2412_i2s.iis_cclk)) {
  58                 pr_err("failed to get i2sclk clock\n");
  59                 ret = PTR_ERR(s3c2412_i2s.iis_cclk);
  60                 goto err;
  61         }
  62
  63         /* Set MPLL as the source for IIS CLK */
  64
  65         clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
  66         ret = clk_prepare_enable(s3c2412_i2s.iis_cclk);
  67         if (ret)
  68                 goto err;
  69
  70         return 0;
  71
  72 err:
  73         s3c_i2sv2_cleanup(dai, &s3c2412_i2s);
  74
  75         return ret;
  76 }
  77
  78 static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
  79 {
  80         clk_disable_unprepare(s3c2412_i2s.iis_cclk);
  81         s3c_i2sv2_cleanup(dai, &s3c2412_i2s);
  82
  83         return 0;
  84 }
  85
  86 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
  87                                  struct snd_pcm_hw_params *params,
  88                                  struct snd_soc_dai *cpu_dai)
  89 {
  90         struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
  91         u32 iismod;
  92
  93         pr_debug("Entered %s\n", __func__);
  94
  95         iismod = readl(i2s->regs + S3C2412_IISMOD);
  96         pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
  97
  98         switch (params_width(params)) {
  99         case 8:
 100                 iismod |= S3C2412_IISMOD_8BIT;
 101                 break;
 102         case 16:
 103                 iismod &= ~S3C2412_IISMOD_8BIT;
 104                 break;
 105         }
 106
 107         writel(iismod, i2s->regs + S3C2412_IISMOD);
 108         pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
 109
 110         return 0;
 111 }
 112
 113 #ifdef CONFIG_PM
 114 static int s3c2412_i2s_suspend(struct snd_soc_component *component)
 115 {
 116         struct s3c_i2sv2_info *i2s = snd_soc_component_get_drvdata(component);
 117         u32 iismod;
 118
 119         if (component->active) {
 120                 i2s->suspend_iismod = readl(i2s->regs + S3C2412_IISMOD);
 121                 i2s->suspend_iiscon = readl(i2s->regs + S3C2412_IISCON);
 122                 i2s->suspend_iispsr = readl(i2s->regs + S3C2412_IISPSR);
 123
 124                 /* some basic suspend checks */
 125
 126                 iismod = readl(i2s->regs + S3C2412_IISMOD);
 127
 128                 if (iismod & S3C2412_IISCON_RXDMA_ACTIVE)
 129                         pr_warn("%s: RXDMA active?\n", __func__);
 130
 131                 if (iismod & S3C2412_IISCON_TXDMA_ACTIVE)
 132                         pr_warn("%s: TXDMA active?\n", __func__);
 133
 134                 if (iismod & S3C2412_IISCON_IIS_ACTIVE)
 135                         pr_warn("%s: IIS active\n", __func__);
 136         }
 137
 138         return 0;
 139 }
 140
 141 static int s3c2412_i2s_resume(struct snd_soc_component *component)
 142 {
 143         struct s3c_i2sv2_info *i2s = snd_soc_component_get_drvdata(component);
 144
 145         pr_info("component_active %d, IISMOD %08x, IISCON %08x\n",
 146                 component->active, i2s->suspend_iismod, i2s->suspend_iiscon);
 147
 148         if (component->active) {
 149                 writel(i2s->suspend_iiscon, i2s->regs + S3C2412_IISCON);
 150                 writel(i2s->suspend_iismod, i2s->regs + S3C2412_IISMOD);
 151                 writel(i2s->suspend_iispsr, i2s->regs + S3C2412_IISPSR);
 152
 153                 writel(S3C2412_IISFIC_RXFLUSH | S3C2412_IISFIC_TXFLUSH,
 154                        i2s->regs + S3C2412_IISFIC);
 155
 156                 ndelay(250);
 157                 writel(0x0, i2s->regs + S3C2412_IISFIC);
 158         }
 159
 160         return 0;
 161 }
 162 #else
 163 #define s3c2412_i2s_suspend NULL
 164 #define s3c2412_i2s_resume  NULL
 165 #endif
 166
 167 #define S3C2412_I2S_RATES \
 168         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 169         SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 170         SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 171
 172 static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
 173         .hw_params      = s3c2412_i2s_hw_params,
 174 };
 175
 176 static struct snd_soc_dai_driver s3c2412_i2s_dai = {
 177         .probe          = s3c2412_i2s_probe,
 178         .remove = s3c2412_i2s_remove,
 179         .playback = {
 180                 .channels_min   = 2,
 181                 .channels_max   = 2,
 182                 .rates          = S3C2412_I2S_RATES,
 183                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 184         },
 185         .capture = {
 186                 .channels_min   = 2,
 187                 .channels_max   = 2,
 188                 .rates          = S3C2412_I2S_RATES,
 189                 .formats        = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
 190         },
 191         .ops = &s3c2412_i2s_dai_ops,
 192 };
 193
 194 static const struct snd_soc_component_driver s3c2412_i2s_component = {
 195         .name           = "s3c2412-i2s",
 196         .suspend        = s3c2412_i2s_suspend,
 197         .resume         = s3c2412_i2s_resume,
 198 };
 199
 200 static int s3c2412_iis_dev_probe(struct platform_device *pdev)
 201 {
 202         int ret = 0;
 203         struct resource *res;
 204         struct s3c_audio_pdata *pdata = dev_get_platdata(&pdev->dev);
 205
 206         if (!pdata) {
 207                 dev_err(&pdev->dev, "missing platform data");
 208                 return -ENXIO;
 209         }
 210
 211         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 212         s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
 213         if (IS_ERR(s3c2412_i2s.regs))
 214                 return PTR_ERR(s3c2412_i2s.regs);
 215
 216         s3c2412_i2s_pcm_stereo_out.addr = res->start + S3C2412_IISTXD;
 217         s3c2412_i2s_pcm_stereo_out.filter_data = pdata->dma_playback;
 218         s3c2412_i2s_pcm_stereo_in.addr = res->start + S3C2412_IISRXD;
 219         s3c2412_i2s_pcm_stereo_in.filter_data = pdata->dma_capture;
 220
 221         ret = samsung_asoc_dma_platform_register(&pdev->dev,
 222                                                  pdata->dma_filter,
 223                                                  "tx", "rx", NULL);
 224         if (ret) {
 225                 pr_err("failed to register the DMA: %d\n", ret);
 226                 return ret;
 227         }
 228
 229         ret = s3c_i2sv2_register_component(&pdev->dev, -1,
 230                                            &s3c2412_i2s_component,
 231                                            &s3c2412_i2s_dai);
 232         if (ret)
 233                 pr_err("failed to register the dai\n");
 234
 235         return ret;
 236 }
 237
 238 static struct platform_driver s3c2412_iis_driver = {
 239         .probe  = s3c2412_iis_dev_probe,
 240         .driver = {
 241                 .name = "s3c2412-iis",
 242         },
 243 };
 244
 245 module_platform_driver(s3c2412_iis_driver);
 246
 247 /* Module information */
 248 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
 249 MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
 250 MODULE_LICENSE("GPL");
 251 MODULE_ALIAS("platform:s3c2412-iis");