sound/soc/au1x/i2sc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Au1000/Au1500/Au1100 I2S controller driver for ASoC
   4  *
   5  * (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com>
   6  *
   7  * Note: clock supplied to the I2S controller must be 256x samplerate.
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/slab.h>
  13 #include <linux/suspend.h>
  14 #include <sound/core.h>
  15 #include <sound/pcm.h>
  16 #include <sound/initval.h>
  17 #include <sound/soc.h>
  18 #include <asm/mach-au1x00/au1000.h>
  19
  20 #include "psc.h"
  21
  22 #define I2S_RXTX        0x00
  23 #define I2S_CFG         0x04
  24 #define I2S_ENABLE      0x08
  25
  26 #define CFG_XU          (1 << 25)       /* tx underflow */
  27 #define CFG_XO          (1 << 24)
  28 #define CFG_RU          (1 << 23)
  29 #define CFG_RO          (1 << 22)
  30 #define CFG_TR          (1 << 21)
  31 #define CFG_TE          (1 << 20)
  32 #define CFG_TF          (1 << 19)
  33 #define CFG_RR          (1 << 18)
  34 #define CFG_RF          (1 << 17)
  35 #define CFG_ICK         (1 << 12)       /* clock invert */
  36 #define CFG_PD          (1 << 11)       /* set to make I2SDIO INPUT */
  37 #define CFG_LB          (1 << 10)       /* loopback */
  38 #define CFG_IC          (1 << 9)        /* word select invert */
  39 #define CFG_FM_I2S      (0 << 7)        /* I2S format */
  40 #define CFG_FM_LJ       (1 << 7)        /* left-justified */
  41 #define CFG_FM_RJ       (2 << 7)        /* right-justified */
  42 #define CFG_FM_MASK     (3 << 7)
  43 #define CFG_TN          (1 << 6)        /* tx fifo en */
  44 #define CFG_RN          (1 << 5)        /* rx fifo en */
  45 #define CFG_SZ_8        (0x08)
  46 #define CFG_SZ_16       (0x10)
  47 #define CFG_SZ_18       (0x12)
  48 #define CFG_SZ_20       (0x14)
  49 #define CFG_SZ_24       (0x18)
  50 #define CFG_SZ_MASK     (0x1f)
  51 #define EN_D            (1 << 1)        /* DISable */
  52 #define EN_CE           (1 << 0)        /* clock enable */
  53
  54 /* only limited by clock generator and board design */
  55 #define AU1XI2SC_RATES \
  56         SNDRV_PCM_RATE_CONTINUOUS
  57
  58 #define AU1XI2SC_FMTS \
  59         (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |            \
  60         SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |     \
  61         SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE |     \
  62         SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_U18_3LE |   \
  63         SNDRV_PCM_FMTBIT_S18_3BE | SNDRV_PCM_FMTBIT_U18_3BE |   \
  64         SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_U20_3LE |   \
  65         SNDRV_PCM_FMTBIT_S20_3BE | SNDRV_PCM_FMTBIT_U20_3BE |   \
  66         SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |     \
  67         SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_U24_BE |     \
  68         0)
  69
  70 static inline unsigned long RD(struct au1xpsc_audio_data *ctx, int reg)
  71 {
  72         return __raw_readl(ctx->mmio + reg);
  73 }
  74
  75 static inline void WR(struct au1xpsc_audio_data *ctx, int reg, unsigned long v)
  76 {
  77         __raw_writel(v, ctx->mmio + reg);
  78         wmb();
  79 }
  80
  81 static int au1xi2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
  82 {
  83         struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(cpu_dai);
  84         unsigned long c;
  85         int ret;
  86
  87         ret = -EINVAL;
  88         c = ctx->cfg;
  89
  90         c &= ~CFG_FM_MASK;
  91         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  92         case SND_SOC_DAIFMT_I2S:
  93                 c |= CFG_FM_I2S;
  94                 break;
  95         case SND_SOC_DAIFMT_MSB:
  96                 c |= CFG_FM_RJ;
  97                 break;
  98         case SND_SOC_DAIFMT_LSB:
  99                 c |= CFG_FM_LJ;
 100                 break;
 101         default:
 102                 goto out;
 103         }
 104
 105         c &= ~(CFG_IC | CFG_ICK);               /* IB-IF */
 106         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 107         case SND_SOC_DAIFMT_NB_NF:
 108                 c |= CFG_IC | CFG_ICK;
 109                 break;
 110         case SND_SOC_DAIFMT_NB_IF:
 111                 c |= CFG_IC;
 112                 break;
 113         case SND_SOC_DAIFMT_IB_NF:
 114                 c |= CFG_ICK;
 115                 break;
 116         case SND_SOC_DAIFMT_IB_IF:
 117                 break;
 118         default:
 119                 goto out;
 120         }
 121
 122         /* I2S controller only supports master */
 123         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 124         case SND_SOC_DAIFMT_CBS_CFS:    /* CODEC slave */
 125                 break;
 126         default:
 127                 goto out;
 128         }
 129
 130         ret = 0;
 131         ctx->cfg = c;
 132 out:
 133         return ret;
 134 }
 135
 136 static int au1xi2s_trigger(struct snd_pcm_substream *substream,
 137                            int cmd, struct snd_soc_dai *dai)
 138 {
 139         struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(dai);
 140         int stype = SUBSTREAM_TYPE(substream);
 141
 142         switch (cmd) {
 143         case SNDRV_PCM_TRIGGER_START:
 144         case SNDRV_PCM_TRIGGER_RESUME:
 145                 /* power up */
 146                 WR(ctx, I2S_ENABLE, EN_D | EN_CE);
 147                 WR(ctx, I2S_ENABLE, EN_CE);
 148                 ctx->cfg |= (stype == PCM_TX) ? CFG_TN : CFG_RN;
 149                 WR(ctx, I2S_CFG, ctx->cfg);
 150                 break;
 151         case SNDRV_PCM_TRIGGER_STOP:
 152         case SNDRV_PCM_TRIGGER_SUSPEND:
 153                 ctx->cfg &= ~((stype == PCM_TX) ? CFG_TN : CFG_RN);
 154                 WR(ctx, I2S_CFG, ctx->cfg);
 155                 WR(ctx, I2S_ENABLE, EN_D);              /* power off */
 156                 break;
 157         default:
 158                 return -EINVAL;
 159         }
 160
 161         return 0;
 162 }
 163
 164 static unsigned long msbits_to_reg(int msbits)
 165 {
 166         switch (msbits) {
 167         case 8:
 168                 return CFG_SZ_8;
 169         case 16:
 170                 return CFG_SZ_16;
 171         case 18:
 172                 return CFG_SZ_18;
 173         case 20:
 174                 return CFG_SZ_20;
 175         case 24:
 176                 return CFG_SZ_24;
 177         }
 178         return 0;
 179 }
 180
 181 static int au1xi2s_hw_params(struct snd_pcm_substream *substream,
 182                              struct snd_pcm_hw_params *params,
 183                              struct snd_soc_dai *dai)
 184 {
 185         struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(dai);
 186         unsigned long v;
 187
 188         v = msbits_to_reg(params->msbits);
 189         if (!v)
 190                 return -EINVAL;
 191
 192         ctx->cfg &= ~CFG_SZ_MASK;
 193         ctx->cfg |= v;
 194         return 0;
 195 }
 196
 197 static int au1xi2s_startup(struct snd_pcm_substream *substream,
 198                            struct snd_soc_dai *dai)
 199 {
 200         struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(dai);
 201         snd_soc_dai_set_dma_data(dai, substream, &ctx->dmaids[0]);
 202         return 0;
 203 }
 204
 205 static const struct snd_soc_dai_ops au1xi2s_dai_ops = {
 206         .startup        = au1xi2s_startup,
 207         .trigger        = au1xi2s_trigger,
 208         .hw_params      = au1xi2s_hw_params,
 209         .set_fmt        = au1xi2s_set_fmt,
 210 };
 211
 212 static struct snd_soc_dai_driver au1xi2s_dai_driver = {
 213         .symmetric_rates        = 1,
 214         .playback = {
 215                 .rates          = AU1XI2SC_RATES,
 216                 .formats        = AU1XI2SC_FMTS,
 217                 .channels_min   = 2,
 218                 .channels_max   = 2,
 219         },
 220         .capture = {
 221                 .rates          = AU1XI2SC_RATES,
 222                 .formats        = AU1XI2SC_FMTS,
 223                 .channels_min   = 2,
 224                 .channels_max   = 2,
 225         },
 226         .ops = &au1xi2s_dai_ops,
 227 };
 228
 229 static const struct snd_soc_component_driver au1xi2s_component = {
 230         .name           = "au1xi2s",
 231 };
 232
 233 static int au1xi2s_drvprobe(struct platform_device *pdev)
 234 {
 235         struct resource *iores, *dmares;
 236         struct au1xpsc_audio_data *ctx;
 237
 238         ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
 239         if (!ctx)
 240                 return -ENOMEM;
 241
 242         iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 243         if (!iores)
 244                 return -ENODEV;
 245
 246         if (!devm_request_mem_region(&pdev->dev, iores->start,
 247                                      resource_size(iores),
 248                                      pdev->name))
 249                 return -EBUSY;
 250
 251         ctx->mmio = devm_ioremap_nocache(&pdev->dev, iores->start,
 252                                          resource_size(iores));
 253         if (!ctx->mmio)
 254                 return -EBUSY;
 255
 256         dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 257         if (!dmares)
 258                 return -EBUSY;
 259         ctx->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;
 260
 261         dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 262         if (!dmares)
 263                 return -EBUSY;
 264         ctx->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;
 265
 266         platform_set_drvdata(pdev, ctx);
 267
 268         return snd_soc_register_component(&pdev->dev, &au1xi2s_component,
 269                                           &au1xi2s_dai_driver, 1);
 270 }
 271
 272 static int au1xi2s_drvremove(struct platform_device *pdev)
 273 {
 274         struct au1xpsc_audio_data *ctx = platform_get_drvdata(pdev);
 275
 276         snd_soc_unregister_component(&pdev->dev);
 277
 278         WR(ctx, I2S_ENABLE, EN_D);      /* clock off, disable */
 279
 280         return 0;
 281 }
 282
 283 #ifdef CONFIG_PM
 284 static int au1xi2s_drvsuspend(struct device *dev)
 285 {
 286         struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev);
 287
 288         WR(ctx, I2S_ENABLE, EN_D);      /* clock off, disable */
 289
 290         return 0;
 291 }
 292
 293 static int au1xi2s_drvresume(struct device *dev)
 294 {
 295         return 0;
 296 }
 297
 298 static const struct dev_pm_ops au1xi2sc_pmops = {
 299         .suspend        = au1xi2s_drvsuspend,
 300         .resume         = au1xi2s_drvresume,
 301 };
 302
 303 #define AU1XI2SC_PMOPS (&au1xi2sc_pmops)
 304
 305 #else
 306
 307 #define AU1XI2SC_PMOPS NULL
 308
 309 #endif
 310
 311 static struct platform_driver au1xi2s_driver = {
 312         .driver = {
 313                 .name   = "alchemy-i2sc",
 314                 .pm     = AU1XI2SC_PMOPS,
 315         },
 316         .probe          = au1xi2s_drvprobe,
 317         .remove         = au1xi2s_drvremove,
 318 };
 319
 320 module_platform_driver(au1xi2s_driver);
 321
 322 MODULE_LICENSE("GPL");
 323 MODULE_DESCRIPTION("Au1000/1500/1100 I2S ASoC driver");
 324 MODULE_AUTHOR("Manuel Lauss");