sound/soc/au1x/i2sc.c

   1 /*
   2  * Au1000/Au1500/Au1100 I2S controller driver for ASoC
   3  *
   4  * (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com>
   5  *
   6  * Note: clock supplied to the I2S controller must be 256x samplerate.
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/module.h>
  11 #include <linux/slab.h>
  12 #include <linux/suspend.h>
  13 #include <sound/core.h>
  14 #include <sound/pcm.h>
  15 #include <sound/initval.h>
  16 #include <sound/soc.h>
  17 #include <asm/mach-au1x00/au1000.h>
  18
  19 #include "psc.h"
  20
  21 #define I2S_RXTX        0x00
  22 #define I2S_CFG         0x04
  23 #define I2S_ENABLE      0x08
  24
  25 #define CFG_XU          (1 << 25)       /* tx underflow */
  26 #define CFG_XO          (1 << 24)
  27 #define CFG_RU          (1 << 23)
  28 #define CFG_RO          (1 << 22)
  29 #define CFG_TR          (1 << 21)
  30 #define CFG_TE          (1 << 20)
  31 #define CFG_TF          (1 << 19)
  32 #define CFG_RR          (1 << 18)
  33 #define CFG_RF          (1 << 17)
  34 #define CFG_ICK         (1 << 12)       /* clock invert */
  35 #define CFG_PD          (1 << 11)       /* set to make I2SDIO INPUT */
  36 #define CFG_LB          (1 << 10)       /* loopback */
  37 #define CFG_IC          (1 << 9)        /* word select invert */
  38 #define CFG_FM_I2S      (0 << 7)        /* I2S format */
  39 #define CFG_FM_LJ       (1 << 7)        /* left-justified */
  40 #define CFG_FM_RJ       (2 << 7)        /* right-justified */
  41 #define CFG_FM_MASK     (3 << 7)
  42 #define CFG_TN          (1 << 6)        /* tx fifo en */
  43 #define CFG_RN          (1 << 5)        /* rx fifo en */
  44 #define CFG_SZ_8        (0x08)
  45 #define CFG_SZ_16       (0x10)
  46 #define CFG_SZ_18       (0x12)
  47 #define CFG_SZ_20       (0x14)
  48 #define CFG_SZ_24       (0x18)
  49 #define CFG_SZ_MASK     (0x1f)
  50 #define EN_D            (1 << 1)        /* DISable */
  51 #define EN_CE           (1 << 0)        /* clock enable */
  52
  53 /* only limited by clock generator and board design */
  54 #define AU1XI2SC_RATES \
  55         SNDRV_PCM_RATE_CONTINUOUS
  56
  57 #define AU1XI2SC_FMTS \
  58         (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |            \
  59         SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |     \
  60         SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE |     \
  61         SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_U18_3LE |   \
  62         SNDRV_PCM_FMTBIT_S18_3BE | SNDRV_PCM_FMTBIT_U18_3BE |   \
  63         SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_U20_3LE |   \
  64         SNDRV_PCM_FMTBIT_S20_3BE | SNDRV_PCM_FMTBIT_U20_3BE |   \
  65         SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |     \
  66         SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_U24_BE |     \
  67         0)
  68
  69 static inline unsigned long RD(struct au1xpsc_audio_data *ctx, int reg)
  70 {
  71         return __raw_readl(ctx->mmio + reg);
  72 }
  73
  74 static inline void WR(struct au1xpsc_audio_data *ctx, int reg, unsigned long v)
  75 {
  76         __raw_writel(v, ctx->mmio + reg);
  77         wmb();
  78 }
  79
  80 static int au1xi2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
  81 {
  82         struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(cpu_dai);
  83         unsigned long c;
  84         int ret;
  85
  86         ret = -EINVAL;
  87         c = ctx->cfg;
  88
  89         c &= ~CFG_FM_MASK;
  90         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  91         case SND_SOC_DAIFMT_I2S:
  92                 c |= CFG_FM_I2S;
  93                 break;
  94         case SND_SOC_DAIFMT_MSB:
  95                 c |= CFG_FM_RJ;
  96                 break;
  97         case SND_SOC_DAIFMT_LSB:
  98                 c |= CFG_FM_LJ;
  99                 break;
 100         default:
 101                 goto out;
 102         }
 103
 104         c &= ~(CFG_IC | CFG_ICK);               /* IB-IF */
 105         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 106         case SND_SOC_DAIFMT_NB_NF:
 107                 c |= CFG_IC | CFG_ICK;
 108                 break;
 109         case SND_SOC_DAIFMT_NB_IF:
 110                 c |= CFG_IC;
 111                 break;
 112         case SND_SOC_DAIFMT_IB_NF:
 113                 c |= CFG_ICK;
 114                 break;
 115         case SND_SOC_DAIFMT_IB_IF:
 116                 break;
 117         default:
 118                 goto out;
 119         }
 120
 121         /* I2S controller only supports master */
 122         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 123         case SND_SOC_DAIFMT_CBS_CFS:    /* CODEC slave */
 124                 break;
 125         default:
 126                 goto out;
 127         }
 128
 129         ret = 0;
 130         ctx->cfg = c;
 131 out:
 132         return ret;
 133 }
 134
 135 static int au1xi2s_trigger(struct snd_pcm_substream *substream,
 136                            int cmd, struct snd_soc_dai *dai)
 137 {
 138         struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(dai);
 139         int stype = SUBSTREAM_TYPE(substream);
 140
 141         switch (cmd) {
 142         case SNDRV_PCM_TRIGGER_START:
 143         case SNDRV_PCM_TRIGGER_RESUME:
 144                 /* power up */
 145                 WR(ctx, I2S_ENABLE, EN_D | EN_CE);
 146                 WR(ctx, I2S_ENABLE, EN_CE);
 147                 ctx->cfg |= (stype == PCM_TX) ? CFG_TN : CFG_RN;
 148                 WR(ctx, I2S_CFG, ctx->cfg);
 149                 break;
 150         case SNDRV_PCM_TRIGGER_STOP:
 151         case SNDRV_PCM_TRIGGER_SUSPEND:
 152                 ctx->cfg &= ~((stype == PCM_TX) ? CFG_TN : CFG_RN);
 153                 WR(ctx, I2S_CFG, ctx->cfg);
 154                 WR(ctx, I2S_ENABLE, EN_D);              /* power off */
 155                 break;
 156         default:
 157                 return -EINVAL;
 158         }
 159
 160         return 0;
 161 }
 162
 163 static unsigned long msbits_to_reg(int msbits)
 164 {
 165         switch (msbits) {
 166         case 8:
 167                 return CFG_SZ_8;
 168         case 16:
 169                 return CFG_SZ_16;
 170         case 18:
 171                 return CFG_SZ_18;
 172         case 20:
 173                 return CFG_SZ_20;
 174         case 24:
 175                 return CFG_SZ_24;
 176         }
 177         return 0;
 178 }
 179
 180 static int au1xi2s_hw_params(struct snd_pcm_substream *substream,
 181                              struct snd_pcm_hw_params *params,
 182                              struct snd_soc_dai *dai)
 183 {
 184         struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(dai);
 185         unsigned long v;
 186
 187         v = msbits_to_reg(params->msbits);
 188         if (!v)
 189                 return -EINVAL;
 190
 191         ctx->cfg &= ~CFG_SZ_MASK;
 192         ctx->cfg |= v;
 193         return 0;
 194 }
 195
 196 static int au1xi2s_startup(struct snd_pcm_substream *substream,
 197                            struct snd_soc_dai *dai)
 198 {
 199         struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(dai);
 200         snd_soc_dai_set_dma_data(dai, substream, &ctx->dmaids[0]);
 201         return 0;
 202 }
 203
 204 static const struct snd_soc_dai_ops au1xi2s_dai_ops = {
 205         .startup        = au1xi2s_startup,
 206         .trigger        = au1xi2s_trigger,
 207         .hw_params      = au1xi2s_hw_params,
 208         .set_fmt        = au1xi2s_set_fmt,
 209 };
 210
 211 static struct snd_soc_dai_driver au1xi2s_dai_driver = {
 212         .symmetric_rates        = 1,
 213         .playback = {
 214                 .rates          = AU1XI2SC_RATES,
 215                 .formats        = AU1XI2SC_FMTS,
 216                 .channels_min   = 2,
 217                 .channels_max   = 2,
 218         },
 219         .capture = {
 220                 .rates          = AU1XI2SC_RATES,
 221                 .formats        = AU1XI2SC_FMTS,
 222                 .channels_min   = 2,
 223                 .channels_max   = 2,
 224         },
 225         .ops = &au1xi2s_dai_ops,
 226 };
 227
 228 static int __devinit au1xi2s_drvprobe(struct platform_device *pdev)
 229 {
 230         int ret;
 231         struct resource *iores, *dmares;
 232         struct au1xpsc_audio_data *ctx;
 233
 234         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 235         if (!ctx)
 236                 return -ENOMEM;
 237
 238         iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 239         if (!iores) {
 240                 ret = -ENODEV;
 241                 goto out0;
 242         }
 243
 244         ret = -EBUSY;
 245         if (!request_mem_region(iores->start, resource_size(iores),
 246                                 pdev->name))
 247                 goto out0;
 248
 249         ctx->mmio = ioremap_nocache(iores->start, resource_size(iores));
 250         if (!ctx->mmio)
 251                 goto out1;
 252
 253         dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 254         if (!dmares)
 255                 goto out2;
 256         ctx->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;
 257
 258         dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 259         if (!dmares)
 260                 goto out2;
 261         ctx->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;
 262
 263         platform_set_drvdata(pdev, ctx);
 264
 265         ret = snd_soc_register_dai(&pdev->dev, &au1xi2s_dai_driver);
 266         if (ret)
 267                 goto out2;
 268
 269         return 0;
 270
 271 out2:
 272         iounmap(ctx->mmio);
 273 out1:
 274         release_mem_region(iores->start, resource_size(iores));
 275 out0:
 276         kfree(ctx);
 277         return ret;
 278 }
 279
 280 static int __devexit au1xi2s_drvremove(struct platform_device *pdev)
 281 {
 282         struct au1xpsc_audio_data *ctx = platform_get_drvdata(pdev);
 283         struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 284
 285         snd_soc_unregister_dai(&pdev->dev);
 286
 287         WR(ctx, I2S_ENABLE, EN_D);      /* clock off, disable */
 288
 289         iounmap(ctx->mmio);
 290         release_mem_region(r->start, resource_size(r));
 291         kfree(ctx);
 292
 293         return 0;
 294 }
 295
 296 #ifdef CONFIG_PM
 297 static int au1xi2s_drvsuspend(struct device *dev)
 298 {
 299         struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev);
 300
 301         WR(ctx, I2S_ENABLE, EN_D);      /* clock off, disable */
 302
 303         return 0;
 304 }
 305
 306 static int au1xi2s_drvresume(struct device *dev)
 307 {
 308         return 0;
 309 }
 310
 311 static const struct dev_pm_ops au1xi2sc_pmops = {
 312         .suspend        = au1xi2s_drvsuspend,
 313         .resume         = au1xi2s_drvresume,
 314 };
 315
 316 #define AU1XI2SC_PMOPS (&au1xi2sc_pmops)
 317
 318 #else
 319
 320 #define AU1XI2SC_PMOPS NULL
 321
 322 #endif
 323
 324 static struct platform_driver au1xi2s_driver = {
 325         .driver = {
 326                 .name   = "alchemy-i2sc",
 327                 .owner  = THIS_MODULE,
 328                 .pm     = AU1XI2SC_PMOPS,
 329         },
 330         .probe          = au1xi2s_drvprobe,
 331         .remove         = __devexit_p(au1xi2s_drvremove),
 332 };
 333
 334 static int __init au1xi2s_load(void)
 335 {
 336         return platform_driver_register(&au1xi2s_driver);
 337 }
 338
 339 static void __exit au1xi2s_unload(void)
 340 {
 341         platform_driver_unregister(&au1xi2s_driver);
 342 }
 343
 344 module_init(au1xi2s_load);
 345 module_exit(au1xi2s_unload);
 346
 347 MODULE_LICENSE("GPL");
 348 MODULE_DESCRIPTION("Au1000/1500/1100 I2S ASoC driver");
 349 MODULE_AUTHOR("Manuel Lauss");