sound/soc/tegra/tegra20_i2s.c

   1 /*
   2  * tegra20_i2s.c - Tegra20 I2S driver
   3  *
   4  * Author: Stephen Warren <swarren@nvidia.com>
   5  * Copyright (C) 2010,2012 - NVIDIA, Inc.
   6  *
   7  * Based on code copyright/by:
   8  *
   9  * Copyright (c) 2009-2010, NVIDIA Corporation.
  10  * Scott Peterson <speterson@nvidia.com>
  11  *
  12  * Copyright (C) 2010 Google, Inc.
  13  * Iliyan Malchev <malchev@google.com>
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * version 2 as published by the Free Software Foundation.
  18  *
  19  * This program is distributed in the hope that it will be useful, but
  20  * WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  22  * General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  27  * 02110-1301 USA
  28  *
  29  */
  30
  31 #include <linux/clk.h>
  32 #include <linux/device.h>
  33 #include <linux/io.h>
  34 #include <linux/module.h>
  35 #include <linux/of.h>
  36 #include <linux/platform_device.h>
  37 #include <linux/pm_runtime.h>
  38 #include <linux/regmap.h>
  39 #include <linux/slab.h>
  40 #include <sound/core.h>
  41 #include <sound/pcm.h>
  42 #include <sound/pcm_params.h>
  43 #include <sound/soc.h>
  44
  45 #include "tegra20_i2s.h"
  46
  47 #define DRV_NAME "tegra20-i2s"
  48
  49 static inline void tegra20_i2s_write(struct tegra20_i2s *i2s, u32 reg, u32 val)
  50 {
  51         regmap_write(i2s->regmap, reg, val);
  52 }
  53
  54 static inline u32 tegra20_i2s_read(struct tegra20_i2s *i2s, u32 reg)
  55 {
  56         u32 val;
  57         regmap_read(i2s->regmap, reg, &val);
  58         return val;
  59 }
  60
  61 static int tegra20_i2s_runtime_suspend(struct device *dev)
  62 {
  63         struct tegra20_i2s *i2s = dev_get_drvdata(dev);
  64
  65         clk_disable(i2s->clk_i2s);
  66
  67         return 0;
  68 }
  69
  70 static int tegra20_i2s_runtime_resume(struct device *dev)
  71 {
  72         struct tegra20_i2s *i2s = dev_get_drvdata(dev);
  73         int ret;
  74
  75         ret = clk_enable(i2s->clk_i2s);
  76         if (ret) {
  77                 dev_err(dev, "clk_enable failed: %d\n", ret);
  78                 return ret;
  79         }
  80
  81         return 0;
  82 }
  83
  84 static int tegra20_i2s_set_fmt(struct snd_soc_dai *dai,
  85                                 unsigned int fmt)
  86 {
  87         struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
  88
  89         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
  90         case SND_SOC_DAIFMT_NB_NF:
  91                 break;
  92         default:
  93                 return -EINVAL;
  94         }
  95
  96         i2s->reg_ctrl &= ~TEGRA20_I2S_CTRL_MASTER_ENABLE;
  97         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
  98         case SND_SOC_DAIFMT_CBS_CFS:
  99                 i2s->reg_ctrl |= TEGRA20_I2S_CTRL_MASTER_ENABLE;
 100                 break;
 101         case SND_SOC_DAIFMT_CBM_CFM:
 102                 break;
 103         default:
 104                 return -EINVAL;
 105         }
 106
 107         i2s->reg_ctrl &= ~(TEGRA20_I2S_CTRL_BIT_FORMAT_MASK |
 108                            TEGRA20_I2S_CTRL_LRCK_MASK);
 109         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 110         case SND_SOC_DAIFMT_DSP_A:
 111                 i2s->reg_ctrl |= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
 112                 i2s->reg_ctrl |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
 113                 break;
 114         case SND_SOC_DAIFMT_DSP_B:
 115                 i2s->reg_ctrl |= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
 116                 i2s->reg_ctrl |= TEGRA20_I2S_CTRL_LRCK_R_LOW;
 117                 break;
 118         case SND_SOC_DAIFMT_I2S:
 119                 i2s->reg_ctrl |= TEGRA20_I2S_CTRL_BIT_FORMAT_I2S;
 120                 i2s->reg_ctrl |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
 121                 break;
 122         case SND_SOC_DAIFMT_RIGHT_J:
 123                 i2s->reg_ctrl |= TEGRA20_I2S_CTRL_BIT_FORMAT_RJM;
 124                 i2s->reg_ctrl |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
 125                 break;
 126         case SND_SOC_DAIFMT_LEFT_J:
 127                 i2s->reg_ctrl |= TEGRA20_I2S_CTRL_BIT_FORMAT_LJM;
 128                 i2s->reg_ctrl |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
 129                 break;
 130         default:
 131                 return -EINVAL;
 132         }
 133
 134         return 0;
 135 }
 136
 137 static int tegra20_i2s_hw_params(struct snd_pcm_substream *substream,
 138                                  struct snd_pcm_hw_params *params,
 139                                  struct snd_soc_dai *dai)
 140 {
 141         struct device *dev = substream->pcm->card->dev;
 142         struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 143         u32 reg;
 144         int ret, sample_size, srate, i2sclock, bitcnt;
 145
 146         i2s->reg_ctrl &= ~TEGRA20_I2S_CTRL_BIT_SIZE_MASK;
 147         switch (params_format(params)) {
 148         case SNDRV_PCM_FORMAT_S16_LE:
 149                 i2s->reg_ctrl |= TEGRA20_I2S_CTRL_BIT_SIZE_16;
 150                 sample_size = 16;
 151                 break;
 152         case SNDRV_PCM_FORMAT_S24_LE:
 153                 i2s->reg_ctrl |= TEGRA20_I2S_CTRL_BIT_SIZE_24;
 154                 sample_size = 24;
 155                 break;
 156         case SNDRV_PCM_FORMAT_S32_LE:
 157                 i2s->reg_ctrl |= TEGRA20_I2S_CTRL_BIT_SIZE_32;
 158                 sample_size = 32;
 159                 break;
 160         default:
 161                 return -EINVAL;
 162         }
 163
 164         srate = params_rate(params);
 165
 166         /* Final "* 2" required by Tegra hardware */
 167         i2sclock = srate * params_channels(params) * sample_size * 2;
 168
 169         ret = clk_set_rate(i2s->clk_i2s, i2sclock);
 170         if (ret) {
 171                 dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
 172                 return ret;
 173         }
 174
 175         bitcnt = (i2sclock / (2 * srate)) - 1;
 176         if (bitcnt < 0 || bitcnt > TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
 177                 return -EINVAL;
 178         reg = bitcnt << TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
 179
 180         if (i2sclock % (2 * srate))
 181                 reg |= TEGRA20_I2S_TIMING_NON_SYM_ENABLE;
 182
 183         tegra20_i2s_write(i2s, TEGRA20_I2S_TIMING, reg);
 184
 185         tegra20_i2s_write(i2s, TEGRA20_I2S_FIFO_SCR,
 186                 TEGRA20_I2S_FIFO_SCR_FIFO2_ATN_LVL_FOUR_SLOTS |
 187                 TEGRA20_I2S_FIFO_SCR_FIFO1_ATN_LVL_FOUR_SLOTS);
 188
 189         return 0;
 190 }
 191
 192 static void tegra20_i2s_start_playback(struct tegra20_i2s *i2s)
 193 {
 194         i2s->reg_ctrl |= TEGRA20_I2S_CTRL_FIFO1_ENABLE;
 195         tegra20_i2s_write(i2s, TEGRA20_I2S_CTRL, i2s->reg_ctrl);
 196 }
 197
 198 static void tegra20_i2s_stop_playback(struct tegra20_i2s *i2s)
 199 {
 200         i2s->reg_ctrl &= ~TEGRA20_I2S_CTRL_FIFO1_ENABLE;
 201         tegra20_i2s_write(i2s, TEGRA20_I2S_CTRL, i2s->reg_ctrl);
 202 }
 203
 204 static void tegra20_i2s_start_capture(struct tegra20_i2s *i2s)
 205 {
 206         i2s->reg_ctrl |= TEGRA20_I2S_CTRL_FIFO2_ENABLE;
 207         tegra20_i2s_write(i2s, TEGRA20_I2S_CTRL, i2s->reg_ctrl);
 208 }
 209
 210 static void tegra20_i2s_stop_capture(struct tegra20_i2s *i2s)
 211 {
 212         i2s->reg_ctrl &= ~TEGRA20_I2S_CTRL_FIFO2_ENABLE;
 213         tegra20_i2s_write(i2s, TEGRA20_I2S_CTRL, i2s->reg_ctrl);
 214 }
 215
 216 static int tegra20_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 217                                struct snd_soc_dai *dai)
 218 {
 219         struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 220
 221         switch (cmd) {
 222         case SNDRV_PCM_TRIGGER_START:
 223         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 224         case SNDRV_PCM_TRIGGER_RESUME:
 225                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 226                         tegra20_i2s_start_playback(i2s);
 227                 else
 228                         tegra20_i2s_start_capture(i2s);
 229                 break;
 230         case SNDRV_PCM_TRIGGER_STOP:
 231         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 232         case SNDRV_PCM_TRIGGER_SUSPEND:
 233                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 234                         tegra20_i2s_stop_playback(i2s);
 235                 else
 236                         tegra20_i2s_stop_capture(i2s);
 237                 break;
 238         default:
 239                 return -EINVAL;
 240         }
 241
 242         return 0;
 243 }
 244
 245 static int tegra20_i2s_probe(struct snd_soc_dai *dai)
 246 {
 247         struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 248
 249         dai->capture_dma_data = &i2s->capture_dma_data;
 250         dai->playback_dma_data = &i2s->playback_dma_data;
 251
 252         return 0;
 253 }
 254
 255 static const struct snd_soc_dai_ops tegra20_i2s_dai_ops = {
 256         .set_fmt        = tegra20_i2s_set_fmt,
 257         .hw_params      = tegra20_i2s_hw_params,
 258         .trigger        = tegra20_i2s_trigger,
 259 };
 260
 261 static const struct snd_soc_dai_driver tegra20_i2s_dai_template = {
 262         .probe = tegra20_i2s_probe,
 263         .playback = {
 264                 .channels_min = 2,
 265                 .channels_max = 2,
 266                 .rates = SNDRV_PCM_RATE_8000_96000,
 267                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 268         },
 269         .capture = {
 270                 .channels_min = 2,
 271                 .channels_max = 2,
 272                 .rates = SNDRV_PCM_RATE_8000_96000,
 273                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 274         },
 275         .ops = &tegra20_i2s_dai_ops,
 276         .symmetric_rates = 1,
 277 };
 278
 279 static bool tegra20_i2s_wr_rd_reg(struct device *dev, unsigned int reg)
 280 {
 281         switch (reg) {
 282         case TEGRA20_I2S_CTRL:
 283         case TEGRA20_I2S_STATUS:
 284         case TEGRA20_I2S_TIMING:
 285         case TEGRA20_I2S_FIFO_SCR:
 286         case TEGRA20_I2S_PCM_CTRL:
 287         case TEGRA20_I2S_NW_CTRL:
 288         case TEGRA20_I2S_TDM_CTRL:
 289         case TEGRA20_I2S_TDM_TX_RX_CTRL:
 290         case TEGRA20_I2S_FIFO1:
 291         case TEGRA20_I2S_FIFO2:
 292                 return true;
 293         default:
 294                 return false;
 295         };
 296 }
 297
 298 static bool tegra20_i2s_volatile_reg(struct device *dev, unsigned int reg)
 299 {
 300         switch (reg) {
 301         case TEGRA20_I2S_STATUS:
 302         case TEGRA20_I2S_FIFO_SCR:
 303         case TEGRA20_I2S_FIFO1:
 304         case TEGRA20_I2S_FIFO2:
 305                 return true;
 306         default:
 307                 return false;
 308         };
 309 }
 310
 311 static bool tegra20_i2s_precious_reg(struct device *dev, unsigned int reg)
 312 {
 313         switch (reg) {
 314         case TEGRA20_I2S_FIFO1:
 315         case TEGRA20_I2S_FIFO2:
 316                 return true;
 317         default:
 318                 return false;
 319         };
 320 }
 321
 322 static const struct regmap_config tegra20_i2s_regmap_config = {
 323         .reg_bits = 32,
 324         .reg_stride = 4,
 325         .val_bits = 32,
 326         .max_register = TEGRA20_I2S_FIFO2,
 327         .writeable_reg = tegra20_i2s_wr_rd_reg,
 328         .readable_reg = tegra20_i2s_wr_rd_reg,
 329         .volatile_reg = tegra20_i2s_volatile_reg,
 330         .precious_reg = tegra20_i2s_precious_reg,
 331         .cache_type = REGCACHE_RBTREE,
 332 };
 333
 334 static __devinit int tegra20_i2s_platform_probe(struct platform_device *pdev)
 335 {
 336         struct tegra20_i2s *i2s;
 337         struct resource *mem, *memregion, *dmareq;
 338         u32 of_dma[2];
 339         u32 dma_ch;
 340         void __iomem *regs;
 341         int ret;
 342
 343         i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_i2s), GFP_KERNEL);
 344         if (!i2s) {
 345                 dev_err(&pdev->dev, "Can't allocate tegra20_i2s\n");
 346                 ret = -ENOMEM;
 347                 goto err;
 348         }
 349         dev_set_drvdata(&pdev->dev, i2s);
 350
 351         i2s->dai = tegra20_i2s_dai_template;
 352         i2s->dai.name = dev_name(&pdev->dev);
 353
 354         i2s->clk_i2s = clk_get(&pdev->dev, NULL);
 355         if (IS_ERR(i2s->clk_i2s)) {
 356                 dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
 357                 ret = PTR_ERR(i2s->clk_i2s);
 358                 goto err;
 359         }
 360
 361         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 362         if (!mem) {
 363                 dev_err(&pdev->dev, "No memory resource\n");
 364                 ret = -ENODEV;
 365                 goto err_clk_put;
 366         }
 367
 368         dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 369         if (!dmareq) {
 370                 if (of_property_read_u32_array(pdev->dev.of_node,
 371                                         "nvidia,dma-request-selector",
 372                                         of_dma, 2) < 0) {
 373                         dev_err(&pdev->dev, "No DMA resource\n");
 374                         ret = -ENODEV;
 375                         goto err_clk_put;
 376                 }
 377                 dma_ch = of_dma[1];
 378         } else {
 379                 dma_ch = dmareq->start;
 380         }
 381
 382         memregion = devm_request_mem_region(&pdev->dev, mem->start,
 383                                             resource_size(mem), DRV_NAME);
 384         if (!memregion) {
 385                 dev_err(&pdev->dev, "Memory region already claimed\n");
 386                 ret = -EBUSY;
 387                 goto err_clk_put;
 388         }
 389
 390         regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
 391         if (!regs) {
 392                 dev_err(&pdev->dev, "ioremap failed\n");
 393                 ret = -ENOMEM;
 394                 goto err_clk_put;
 395         }
 396
 397         i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
 398                                             &tegra20_i2s_regmap_config);
 399         if (IS_ERR(i2s->regmap)) {
 400                 dev_err(&pdev->dev, "regmap init failed\n");
 401                 ret = PTR_ERR(i2s->regmap);
 402                 goto err_clk_put;
 403         }
 404
 405         i2s->capture_dma_data.addr = mem->start + TEGRA20_I2S_FIFO2;
 406         i2s->capture_dma_data.wrap = 4;
 407         i2s->capture_dma_data.width = 32;
 408         i2s->capture_dma_data.req_sel = dma_ch;
 409
 410         i2s->playback_dma_data.addr = mem->start + TEGRA20_I2S_FIFO1;
 411         i2s->playback_dma_data.wrap = 4;
 412         i2s->playback_dma_data.width = 32;
 413         i2s->playback_dma_data.req_sel = dma_ch;
 414
 415         i2s->reg_ctrl = TEGRA20_I2S_CTRL_FIFO_FORMAT_PACKED;
 416
 417         pm_runtime_enable(&pdev->dev);
 418         if (!pm_runtime_enabled(&pdev->dev)) {
 419                 ret = tegra20_i2s_runtime_resume(&pdev->dev);
 420                 if (ret)
 421                         goto err_pm_disable;
 422         }
 423
 424         ret = snd_soc_register_dai(&pdev->dev, &i2s->dai);
 425         if (ret) {
 426                 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
 427                 ret = -ENOMEM;
 428                 goto err_suspend;
 429         }
 430
 431         ret = tegra_pcm_platform_register(&pdev->dev);
 432         if (ret) {
 433                 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
 434                 goto err_unregister_dai;
 435         }
 436
 437         return 0;
 438
 439 err_unregister_dai:
 440         snd_soc_unregister_dai(&pdev->dev);
 441 err_suspend:
 442         if (!pm_runtime_status_suspended(&pdev->dev))
 443                 tegra20_i2s_runtime_suspend(&pdev->dev);
 444 err_pm_disable:
 445         pm_runtime_disable(&pdev->dev);
 446 err_clk_put:
 447         clk_put(i2s->clk_i2s);
 448 err:
 449         return ret;
 450 }
 451
 452 static int __devexit tegra20_i2s_platform_remove(struct platform_device *pdev)
 453 {
 454         struct tegra20_i2s *i2s = dev_get_drvdata(&pdev->dev);
 455
 456         pm_runtime_disable(&pdev->dev);
 457         if (!pm_runtime_status_suspended(&pdev->dev))
 458                 tegra20_i2s_runtime_suspend(&pdev->dev);
 459
 460         tegra_pcm_platform_unregister(&pdev->dev);
 461         snd_soc_unregister_dai(&pdev->dev);
 462
 463         clk_put(i2s->clk_i2s);
 464
 465         return 0;
 466 }
 467
 468 static const struct of_device_id tegra20_i2s_of_match[] __devinitconst = {
 469         { .compatible = "nvidia,tegra20-i2s", },
 470         {},
 471 };
 472
 473 static const struct dev_pm_ops tegra20_i2s_pm_ops __devinitconst = {
 474         SET_RUNTIME_PM_OPS(tegra20_i2s_runtime_suspend,
 475                            tegra20_i2s_runtime_resume, NULL)
 476 };
 477
 478 static struct platform_driver tegra20_i2s_driver = {
 479         .driver = {
 480                 .name = DRV_NAME,
 481                 .owner = THIS_MODULE,
 482                 .of_match_table = tegra20_i2s_of_match,
 483                 .pm = &tegra20_i2s_pm_ops,
 484         },
 485         .probe = tegra20_i2s_platform_probe,
 486         .remove = __devexit_p(tegra20_i2s_platform_remove),
 487 };
 488 module_platform_driver(tegra20_i2s_driver);
 489
 490 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 491 MODULE_DESCRIPTION("Tegra20 I2S ASoC driver");
 492 MODULE_LICENSE("GPL");
 493 MODULE_ALIAS("platform:" DRV_NAME);
 494 MODULE_DEVICE_TABLE(of, tegra20_i2s_of_match);