sound/soc/zte/zx-i2s.c

   1 /*
   2  * Copyright (C) 2015 Linaro
   3  *
   4  * Author: Jun Nie <jun.nie@linaro.org>
   5  *
   6  * License terms: GNU General Public License (GPL) version 2
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/device.h>
  11 #include <linux/init.h>
  12 #include <linux/io.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <sound/pcm.h>
  16 #include <sound/pcm_params.h>
  17 #include <sound/soc.h>
  18 #include <sound/soc-dai.h>
  19
  20 #include <sound/core.h>
  21 #include <sound/dmaengine_pcm.h>
  22 #include <sound/initval.h>
  23
  24 #define ZX_I2S_PROCESS_CTRL     0x04
  25 #define ZX_I2S_TIMING_CTRL      0x08
  26 #define ZX_I2S_FIFO_CTRL        0x0C
  27 #define ZX_I2S_FIFO_STATUS      0x10
  28 #define ZX_I2S_INT_EN           0x14
  29 #define ZX_I2S_INT_STATUS       0x18
  30 #define ZX_I2S_DATA             0x1C
  31 #define ZX_I2S_FRAME_CNTR       0x20
  32
  33 #define I2S_DEAGULT_FIFO_THRES  (0x10)
  34 #define I2S_MAX_FIFO_THRES      (0x20)
  35
  36 #define ZX_I2S_PROCESS_TX_EN    (1 << 0)
  37 #define ZX_I2S_PROCESS_TX_DIS   (0 << 0)
  38 #define ZX_I2S_PROCESS_RX_EN    (1 << 1)
  39 #define ZX_I2S_PROCESS_RX_DIS   (0 << 1)
  40 #define ZX_I2S_PROCESS_I2S_EN   (1 << 2)
  41 #define ZX_I2S_PROCESS_I2S_DIS  (0 << 2)
  42
  43 #define ZX_I2S_TIMING_MAST              (1 << 0)
  44 #define ZX_I2S_TIMING_SLAVE             (0 << 0)
  45 #define ZX_I2S_TIMING_MS_MASK           (1 << 0)
  46 #define ZX_I2S_TIMING_LOOP              (1 << 1)
  47 #define ZX_I2S_TIMING_NOR               (0 << 1)
  48 #define ZX_I2S_TIMING_LOOP_MASK         (1 << 1)
  49 #define ZX_I2S_TIMING_PTNR              (1 << 2)
  50 #define ZX_I2S_TIMING_NTPR              (0 << 2)
  51 #define ZX_I2S_TIMING_PHASE_MASK        (1 << 2)
  52 #define ZX_I2S_TIMING_TDM               (1 << 3)
  53 #define ZX_I2S_TIMING_I2S               (0 << 3)
  54 #define ZX_I2S_TIMING_TIMING_MASK       (1 << 3)
  55 #define ZX_I2S_TIMING_LONG_SYNC         (1 << 4)
  56 #define ZX_I2S_TIMING_SHORT_SYNC        (0 << 4)
  57 #define ZX_I2S_TIMING_SYNC_MASK         (1 << 4)
  58 #define ZX_I2S_TIMING_TEAK_EN           (1 << 5)
  59 #define ZX_I2S_TIMING_TEAK_DIS          (0 << 5)
  60 #define ZX_I2S_TIMING_TEAK_MASK         (1 << 5)
  61 #define ZX_I2S_TIMING_STD_I2S           (0 << 6)
  62 #define ZX_I2S_TIMING_MSB_JUSTIF        (1 << 6)
  63 #define ZX_I2S_TIMING_LSB_JUSTIF        (2 << 6)
  64 #define ZX_I2S_TIMING_ALIGN_MASK        (3 << 6)
  65 #define ZX_I2S_TIMING_CHN_MASK          (7 << 8)
  66 #define ZX_I2S_TIMING_CHN(x)            ((x - 1) << 8)
  67 #define ZX_I2S_TIMING_LANE_MASK         (3 << 11)
  68 #define ZX_I2S_TIMING_LANE(x)           ((x - 1) << 11)
  69 #define ZX_I2S_TIMING_TSCFG_MASK        (7 << 13)
  70 #define ZX_I2S_TIMING_TSCFG(x)          (x << 13)
  71 #define ZX_I2S_TIMING_TS_WIDTH_MASK     (0x1f << 16)
  72 #define ZX_I2S_TIMING_TS_WIDTH(x)       ((x - 1) << 16)
  73 #define ZX_I2S_TIMING_DATA_SIZE_MASK    (0x1f << 21)
  74 #define ZX_I2S_TIMING_DATA_SIZE(x)      ((x - 1) << 21)
  75 #define ZX_I2S_TIMING_CFG_ERR_MASK      (1 << 31)
  76
  77 #define ZX_I2S_FIFO_CTRL_TX_RST         (1 << 0)
  78 #define ZX_I2S_FIFO_CTRL_TX_RST_MASK    (1 << 0)
  79 #define ZX_I2S_FIFO_CTRL_RX_RST         (1 << 1)
  80 #define ZX_I2S_FIFO_CTRL_RX_RST_MASK    (1 << 1)
  81 #define ZX_I2S_FIFO_CTRL_TX_DMA_EN      (1 << 4)
  82 #define ZX_I2S_FIFO_CTRL_TX_DMA_DIS     (0 << 4)
  83 #define ZX_I2S_FIFO_CTRL_TX_DMA_MASK    (1 << 4)
  84 #define ZX_I2S_FIFO_CTRL_RX_DMA_EN      (1 << 5)
  85 #define ZX_I2S_FIFO_CTRL_RX_DMA_DIS     (0 << 5)
  86 #define ZX_I2S_FIFO_CTRL_RX_DMA_MASK    (1 << 5)
  87 #define ZX_I2S_FIFO_CTRL_TX_THRES_MASK  (0x1F << 8)
  88 #define ZX_I2S_FIFO_CTRL_RX_THRES_MASK  (0x1F << 16)
  89
  90 #define CLK_RAT (32 * 4)
  91
  92 struct zx_i2s_info {
  93         struct snd_dmaengine_dai_dma_data       dma_playback;
  94         struct snd_dmaengine_dai_dma_data       dma_capture;
  95         struct clk                              *dai_wclk;
  96         struct clk                              *dai_pclk;
  97         void __iomem                            *reg_base;
  98         int                                     master;
  99         resource_size_t                         mapbase;
 100 };
 101
 102 static void zx_i2s_tx_en(void __iomem *base, bool on)
 103 {
 104         unsigned long val;
 105
 106         val = readl_relaxed(base + ZX_I2S_PROCESS_CTRL);
 107         if (on)
 108                 val |= ZX_I2S_PROCESS_TX_EN | ZX_I2S_PROCESS_I2S_EN;
 109         else
 110                 val &= ~(ZX_I2S_PROCESS_TX_EN | ZX_I2S_PROCESS_I2S_EN);
 111         writel_relaxed(val, base + ZX_I2S_PROCESS_CTRL);
 112 }
 113
 114 static void zx_i2s_rx_en(void __iomem *base, bool on)
 115 {
 116         unsigned long val;
 117
 118         val = readl_relaxed(base + ZX_I2S_PROCESS_CTRL);
 119         if (on)
 120                 val |= ZX_I2S_PROCESS_RX_EN | ZX_I2S_PROCESS_I2S_EN;
 121         else
 122                 val &= ~(ZX_I2S_PROCESS_RX_EN | ZX_I2S_PROCESS_I2S_EN);
 123         writel_relaxed(val, base + ZX_I2S_PROCESS_CTRL);
 124 }
 125
 126 static void zx_i2s_tx_dma_en(void __iomem *base, bool on)
 127 {
 128         unsigned long val;
 129
 130         val = readl_relaxed(base + ZX_I2S_FIFO_CTRL);
 131         val |= ZX_I2S_FIFO_CTRL_TX_RST | (I2S_DEAGULT_FIFO_THRES << 8);
 132         if (on)
 133                 val |= ZX_I2S_FIFO_CTRL_TX_DMA_EN;
 134         else
 135                 val &= ~ZX_I2S_FIFO_CTRL_TX_DMA_EN;
 136         writel_relaxed(val, base + ZX_I2S_FIFO_CTRL);
 137 }
 138
 139 static void zx_i2s_rx_dma_en(void __iomem *base, bool on)
 140 {
 141         unsigned long val;
 142
 143         val = readl_relaxed(base + ZX_I2S_FIFO_CTRL);
 144         val |= ZX_I2S_FIFO_CTRL_RX_RST | (I2S_DEAGULT_FIFO_THRES << 16);
 145         if (on)
 146                 val |= ZX_I2S_FIFO_CTRL_RX_DMA_EN;
 147         else
 148                 val &= ~ZX_I2S_FIFO_CTRL_RX_DMA_EN;
 149         writel_relaxed(val, base + ZX_I2S_FIFO_CTRL);
 150 }
 151
 152 #define ZX_I2S_RATES \
 153         (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 154          SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 155          SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000| \
 156          SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000)
 157
 158 #define ZX_I2S_FMTBIT \
 159         (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE | \
 160         SNDRV_PCM_FMTBIT_S32_LE)
 161
 162 static int zx_i2s_dai_probe(struct snd_soc_dai *dai)
 163 {
 164         struct zx_i2s_info *zx_i2s = dev_get_drvdata(dai->dev);
 165
 166         snd_soc_dai_set_drvdata(dai, zx_i2s);
 167         zx_i2s->dma_playback.addr = zx_i2s->mapbase + ZX_I2S_DATA;
 168         zx_i2s->dma_playback.maxburst = 16;
 169         zx_i2s->dma_capture.addr = zx_i2s->mapbase + ZX_I2S_DATA;
 170         zx_i2s->dma_capture.maxburst = 16;
 171         snd_soc_dai_init_dma_data(dai, &zx_i2s->dma_playback,
 172                                   &zx_i2s->dma_capture);
 173         return 0;
 174 }
 175
 176 static int zx_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
 177 {
 178         struct zx_i2s_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 179         unsigned long val;
 180
 181         val = readl_relaxed(i2s->reg_base + ZX_I2S_TIMING_CTRL);
 182         val &= ~(ZX_I2S_TIMING_TIMING_MASK | ZX_I2S_TIMING_ALIGN_MASK |
 183                         ZX_I2S_TIMING_TEAK_MASK | ZX_I2S_TIMING_SYNC_MASK |
 184                         ZX_I2S_TIMING_MS_MASK);
 185
 186         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 187         case SND_SOC_DAIFMT_I2S:
 188                 val |= (ZX_I2S_TIMING_I2S | ZX_I2S_TIMING_STD_I2S);
 189                 break;
 190         case SND_SOC_DAIFMT_LEFT_J:
 191                 val |= (ZX_I2S_TIMING_I2S | ZX_I2S_TIMING_MSB_JUSTIF);
 192                 break;
 193         case SND_SOC_DAIFMT_RIGHT_J:
 194                 val |= (ZX_I2S_TIMING_I2S | ZX_I2S_TIMING_LSB_JUSTIF);
 195                 break;
 196         default:
 197                 dev_err(cpu_dai->dev, "Unknown i2s timing\n");
 198                 return -EINVAL;
 199         }
 200
 201         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 202         case SND_SOC_DAIFMT_CBM_CFM:
 203                 /* Codec is master, and I2S is slave. */
 204                 i2s->master = 0;
 205                 val |= ZX_I2S_TIMING_SLAVE;
 206                 break;
 207         case SND_SOC_DAIFMT_CBS_CFS:
 208                 /* Codec is slave, and I2S is master. */
 209                 i2s->master = 1;
 210                 val |= ZX_I2S_TIMING_MAST;
 211                 break;
 212         default:
 213                 dev_err(cpu_dai->dev, "Unknown master/slave format\n");
 214                 return -EINVAL;
 215         }
 216
 217         writel_relaxed(val, i2s->reg_base + ZX_I2S_TIMING_CTRL);
 218         return 0;
 219 }
 220
 221 static int zx_i2s_hw_params(struct snd_pcm_substream *substream,
 222                             struct snd_pcm_hw_params *params,
 223                             struct snd_soc_dai *socdai)
 224 {
 225         struct zx_i2s_info *i2s = snd_soc_dai_get_drvdata(socdai);
 226         struct snd_dmaengine_dai_dma_data *dma_data;
 227         unsigned int lane, ch_num, len, ret = 0;
 228         unsigned int ts_width = 32;
 229         unsigned long val;
 230         unsigned long chn_cfg;
 231
 232         dma_data = snd_soc_dai_get_dma_data(socdai, substream);
 233         dma_data->addr_width = ts_width >> 3;
 234
 235         val = readl_relaxed(i2s->reg_base + ZX_I2S_TIMING_CTRL);
 236         val &= ~(ZX_I2S_TIMING_TS_WIDTH_MASK | ZX_I2S_TIMING_DATA_SIZE_MASK |
 237                 ZX_I2S_TIMING_LANE_MASK | ZX_I2S_TIMING_CHN_MASK |
 238                 ZX_I2S_TIMING_TSCFG_MASK);
 239
 240         switch (params_format(params)) {
 241         case SNDRV_PCM_FORMAT_S16_LE:
 242                 len = 16;
 243                 break;
 244         case SNDRV_PCM_FORMAT_S24_LE:
 245                 len = 24;
 246                 break;
 247         case SNDRV_PCM_FORMAT_S32_LE:
 248                 len = 32;
 249                 break;
 250         default:
 251                 dev_err(socdai->dev, "Unknown data format\n");
 252                 return -EINVAL;
 253         }
 254         val |= ZX_I2S_TIMING_TS_WIDTH(ts_width) | ZX_I2S_TIMING_DATA_SIZE(len);
 255
 256         ch_num = params_channels(params);
 257         switch (ch_num) {
 258         case 1:
 259                 lane = 1;
 260                 chn_cfg = 2;
 261                 break;
 262         case 2:
 263         case 4:
 264         case 6:
 265         case 8:
 266                 lane = ch_num / 2;
 267                 chn_cfg = 3;
 268                 break;
 269         default:
 270                 dev_err(socdai->dev, "Not support channel num %d\n", ch_num);
 271                 return -EINVAL;
 272         }
 273         val |= ZX_I2S_TIMING_LANE(lane);
 274         val |= ZX_I2S_TIMING_TSCFG(chn_cfg);
 275         val |= ZX_I2S_TIMING_CHN(ch_num);
 276         writel_relaxed(val, i2s->reg_base + ZX_I2S_TIMING_CTRL);
 277
 278         if (i2s->master)
 279                 ret = clk_set_rate(i2s->dai_wclk,
 280                                 params_rate(params) * ch_num * CLK_RAT);
 281
 282         return ret;
 283 }
 284
 285 static int zx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 286                           struct snd_soc_dai *dai)
 287 {
 288         struct zx_i2s_info *zx_i2s = dev_get_drvdata(dai->dev);
 289         int capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);
 290         int ret = 0;
 291
 292         switch (cmd) {
 293         case SNDRV_PCM_TRIGGER_START:
 294                 if (capture)
 295                         zx_i2s_rx_dma_en(zx_i2s->reg_base, true);
 296                 else
 297                         zx_i2s_tx_dma_en(zx_i2s->reg_base, true);
 298         /* fall thru */
 299         case SNDRV_PCM_TRIGGER_RESUME:
 300         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 301                 if (capture)
 302                         zx_i2s_rx_en(zx_i2s->reg_base, true);
 303                 else
 304                         zx_i2s_tx_en(zx_i2s->reg_base, true);
 305                 break;
 306
 307         case SNDRV_PCM_TRIGGER_STOP:
 308                 if (capture)
 309                         zx_i2s_rx_dma_en(zx_i2s->reg_base, false);
 310                 else
 311                         zx_i2s_tx_dma_en(zx_i2s->reg_base, false);
 312         /* fall thru */
 313         case SNDRV_PCM_TRIGGER_SUSPEND:
 314         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 315                 if (capture)
 316                         zx_i2s_rx_en(zx_i2s->reg_base, false);
 317                 else
 318                         zx_i2s_tx_en(zx_i2s->reg_base, false);
 319                 break;
 320
 321         default:
 322                 ret = -EINVAL;
 323                 break;
 324         }
 325
 326         return ret;
 327 }
 328
 329 static int zx_i2s_startup(struct snd_pcm_substream *substream,
 330                           struct snd_soc_dai *dai)
 331 {
 332         struct zx_i2s_info *zx_i2s = dev_get_drvdata(dai->dev);
 333         int ret;
 334
 335         ret = clk_prepare_enable(zx_i2s->dai_wclk);
 336         if (ret)
 337                 return ret;
 338
 339         ret = clk_prepare_enable(zx_i2s->dai_pclk);
 340         if (ret) {
 341                 clk_disable_unprepare(zx_i2s->dai_wclk);
 342                 return ret;
 343         }
 344
 345         return ret;
 346 }
 347
 348 static void zx_i2s_shutdown(struct snd_pcm_substream *substream,
 349                             struct snd_soc_dai *dai)
 350 {
 351         struct zx_i2s_info *zx_i2s = dev_get_drvdata(dai->dev);
 352
 353         clk_disable_unprepare(zx_i2s->dai_wclk);
 354         clk_disable_unprepare(zx_i2s->dai_pclk);
 355 }
 356
 357 static const struct snd_soc_dai_ops zx_i2s_dai_ops = {
 358         .trigger        = zx_i2s_trigger,
 359         .hw_params      = zx_i2s_hw_params,
 360         .set_fmt        = zx_i2s_set_fmt,
 361         .startup        = zx_i2s_startup,
 362         .shutdown       = zx_i2s_shutdown,
 363 };
 364
 365 static const struct snd_soc_component_driver zx_i2s_component = {
 366         .name                   = "zx-i2s",
 367 };
 368
 369 static struct snd_soc_dai_driver zx_i2s_dai = {
 370         .name   = "zx-i2s-dai",
 371         .id     = 0,
 372         .probe  = zx_i2s_dai_probe,
 373         .playback   = {
 374                 .channels_min   = 1,
 375                 .channels_max   = 8,
 376                 .rates          = ZX_I2S_RATES,
 377                 .formats        = ZX_I2S_FMTBIT,
 378         },
 379         .capture = {
 380                 .channels_min   = 1,
 381                 .channels_max   = 2,
 382                 .rates          = ZX_I2S_RATES,
 383                 .formats        = ZX_I2S_FMTBIT,
 384         },
 385         .ops    = &zx_i2s_dai_ops,
 386 };
 387
 388 static int zx_i2s_probe(struct platform_device *pdev)
 389 {
 390         struct resource *res;
 391         struct zx_i2s_info *zx_i2s;
 392         int ret;
 393
 394         zx_i2s = devm_kzalloc(&pdev->dev, sizeof(*zx_i2s), GFP_KERNEL);
 395         if (!zx_i2s)
 396                 return -ENOMEM;
 397
 398         zx_i2s->dai_wclk = devm_clk_get(&pdev->dev, "wclk");
 399         if (IS_ERR(zx_i2s->dai_wclk)) {
 400                 dev_err(&pdev->dev, "Fail to get wclk\n");
 401                 return PTR_ERR(zx_i2s->dai_wclk);
 402         }
 403
 404         zx_i2s->dai_pclk = devm_clk_get(&pdev->dev, "pclk");
 405         if (IS_ERR(zx_i2s->dai_pclk)) {
 406                 dev_err(&pdev->dev, "Fail to get pclk\n");
 407                 return PTR_ERR(zx_i2s->dai_pclk);
 408         }
 409
 410         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 411         zx_i2s->mapbase = res->start;
 412         zx_i2s->reg_base = devm_ioremap_resource(&pdev->dev, res);
 413         if (IS_ERR(zx_i2s->reg_base)) {
 414                 dev_err(&pdev->dev, "ioremap failed!\n");
 415                 return PTR_ERR(zx_i2s->reg_base);
 416         }
 417
 418         writel_relaxed(0, zx_i2s->reg_base + ZX_I2S_FIFO_CTRL);
 419         platform_set_drvdata(pdev, zx_i2s);
 420
 421         ret = devm_snd_soc_register_component(&pdev->dev, &zx_i2s_component,
 422                                               &zx_i2s_dai, 1);
 423         if (ret) {
 424                 dev_err(&pdev->dev, "Register DAI failed: %d\n", ret);
 425                 return ret;
 426         }
 427
 428         ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
 429         if (ret)
 430                 dev_err(&pdev->dev, "Register platform PCM failed: %d\n", ret);
 431
 432         return ret;
 433 }
 434
 435 static const struct of_device_id zx_i2s_dt_ids[] = {
 436         { .compatible = "zte,zx296702-i2s", },
 437         {}
 438 };
 439 MODULE_DEVICE_TABLE(of, zx_i2s_dt_ids);
 440
 441 static struct platform_driver i2s_driver = {
 442         .probe = zx_i2s_probe,
 443         .driver = {
 444                 .name = "zx-i2s",
 445                 .of_match_table = zx_i2s_dt_ids,
 446         },
 447 };
 448
 449 module_platform_driver(i2s_driver);
 450
 451 MODULE_AUTHOR("Jun Nie <jun.nie@linaro.org>");
 452 MODULE_DESCRIPTION("ZTE I2S SoC DAI");
 453 MODULE_LICENSE("GPL");