sound/soc/tegra/tegra30_i2s.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * tegra30_i2s.c - Tegra30 I2S driver
   4  *
   5  * Author: Stephen Warren <swarren@nvidia.com>
   6  * Copyright (c) 2010-2012, NVIDIA CORPORATION.  All rights reserved.
   7  *
   8  * Based on code copyright/by:
   9  *
  10  * Copyright (c) 2009-2010, NVIDIA Corporation.
  11  * Scott Peterson <speterson@nvidia.com>
  12  *
  13  * Copyright (C) 2010 Google, Inc.
  14  * Iliyan Malchev <malchev@google.com>
  15  */
  16
  17 #include <linux/clk.h>
  18 #include <linux/device.h>
  19 #include <linux/io.h>
  20 #include <linux/module.h>
  21 #include <linux/of.h>
  22 #include <linux/of_device.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/regmap.h>
  26 #include <linux/slab.h>
  27 #include <sound/core.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/soc.h>
  31 #include <sound/dmaengine_pcm.h>
  32
  33 #include "tegra30_ahub.h"
  34 #include "tegra30_i2s.h"
  35
  36 #define DRV_NAME "tegra30-i2s"
  37
  38 static int tegra30_i2s_runtime_suspend(struct device *dev)
  39 {
  40         struct tegra30_i2s *i2s = dev_get_drvdata(dev);
  41
  42         regcache_cache_only(i2s->regmap, true);
  43
  44         clk_disable_unprepare(i2s->clk_i2s);
  45
  46         return 0;
  47 }
  48
  49 static int tegra30_i2s_runtime_resume(struct device *dev)
  50 {
  51         struct tegra30_i2s *i2s = dev_get_drvdata(dev);
  52         int ret;
  53
  54         ret = clk_prepare_enable(i2s->clk_i2s);
  55         if (ret) {
  56                 dev_err(dev, "clk_enable failed: %d\n", ret);
  57                 return ret;
  58         }
  59
  60         regcache_cache_only(i2s->regmap, false);
  61
  62         return 0;
  63 }
  64
  65 static int tegra30_i2s_set_fmt(struct snd_soc_dai *dai,
  66                                 unsigned int fmt)
  67 {
  68         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
  69         unsigned int mask = 0, val = 0;
  70
  71         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
  72         case SND_SOC_DAIFMT_NB_NF:
  73                 break;
  74         default:
  75                 return -EINVAL;
  76         }
  77
  78         mask |= TEGRA30_I2S_CTRL_MASTER_ENABLE;
  79         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
  80         case SND_SOC_DAIFMT_CBS_CFS:
  81                 val |= TEGRA30_I2S_CTRL_MASTER_ENABLE;
  82                 break;
  83         case SND_SOC_DAIFMT_CBM_CFM:
  84                 break;
  85         default:
  86                 return -EINVAL;
  87         }
  88
  89         mask |= TEGRA30_I2S_CTRL_FRAME_FORMAT_MASK |
  90                 TEGRA30_I2S_CTRL_LRCK_MASK;
  91         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  92         case SND_SOC_DAIFMT_DSP_A:
  93                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_FSYNC;
  94                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
  95                 break;
  96         case SND_SOC_DAIFMT_DSP_B:
  97                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_FSYNC;
  98                 val |= TEGRA30_I2S_CTRL_LRCK_R_LOW;
  99                 break;
 100         case SND_SOC_DAIFMT_I2S:
 101                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
 102                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 103                 break;
 104         case SND_SOC_DAIFMT_RIGHT_J:
 105                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
 106                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 107                 break;
 108         case SND_SOC_DAIFMT_LEFT_J:
 109                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
 110                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 111                 break;
 112         default:
 113                 return -EINVAL;
 114         }
 115
 116         pm_runtime_get_sync(dai->dev);
 117         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL, mask, val);
 118         pm_runtime_put(dai->dev);
 119
 120         return 0;
 121 }
 122
 123 static int tegra30_i2s_hw_params(struct snd_pcm_substream *substream,
 124                                  struct snd_pcm_hw_params *params,
 125                                  struct snd_soc_dai *dai)
 126 {
 127         struct device *dev = dai->dev;
 128         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 129         unsigned int mask, val, reg;
 130         int ret, sample_size, srate, i2sclock, bitcnt;
 131         struct tegra30_ahub_cif_conf cif_conf;
 132
 133         if (params_channels(params) != 2)
 134                 return -EINVAL;
 135
 136         mask = TEGRA30_I2S_CTRL_BIT_SIZE_MASK;
 137         switch (params_format(params)) {
 138         case SNDRV_PCM_FORMAT_S16_LE:
 139                 val = TEGRA30_I2S_CTRL_BIT_SIZE_16;
 140                 sample_size = 16;
 141                 break;
 142         default:
 143                 return -EINVAL;
 144         }
 145
 146         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL, mask, val);
 147
 148         srate = params_rate(params);
 149
 150         /* Final "* 2" required by Tegra hardware */
 151         i2sclock = srate * params_channels(params) * sample_size * 2;
 152
 153         bitcnt = (i2sclock / (2 * srate)) - 1;
 154         if (bitcnt < 0 || bitcnt > TEGRA30_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
 155                 return -EINVAL;
 156
 157         ret = clk_set_rate(i2s->clk_i2s, i2sclock);
 158         if (ret) {
 159                 dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
 160                 return ret;
 161         }
 162
 163         val = bitcnt << TEGRA30_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
 164
 165         if (i2sclock % (2 * srate))
 166                 val |= TEGRA30_I2S_TIMING_NON_SYM_ENABLE;
 167
 168         regmap_write(i2s->regmap, TEGRA30_I2S_TIMING, val);
 169
 170         cif_conf.threshold = 0;
 171         cif_conf.audio_channels = 2;
 172         cif_conf.client_channels = 2;
 173         cif_conf.audio_bits = TEGRA30_AUDIOCIF_BITS_16;
 174         cif_conf.client_bits = TEGRA30_AUDIOCIF_BITS_16;
 175         cif_conf.expand = 0;
 176         cif_conf.stereo_conv = 0;
 177         cif_conf.replicate = 0;
 178         cif_conf.truncate = 0;
 179         cif_conf.mono_conv = 0;
 180
 181         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 182                 cif_conf.direction = TEGRA30_AUDIOCIF_DIRECTION_RX;
 183                 reg = TEGRA30_I2S_CIF_RX_CTRL;
 184         } else {
 185                 cif_conf.direction = TEGRA30_AUDIOCIF_DIRECTION_TX;
 186                 reg = TEGRA30_I2S_CIF_TX_CTRL;
 187         }
 188
 189         i2s->soc_data->set_audio_cif(i2s->regmap, reg, &cif_conf);
 190
 191         val = (1 << TEGRA30_I2S_OFFSET_RX_DATA_OFFSET_SHIFT) |
 192               (1 << TEGRA30_I2S_OFFSET_TX_DATA_OFFSET_SHIFT);
 193         regmap_write(i2s->regmap, TEGRA30_I2S_OFFSET, val);
 194
 195         return 0;
 196 }
 197
 198 static void tegra30_i2s_start_playback(struct tegra30_i2s *i2s)
 199 {
 200         tegra30_ahub_enable_tx_fifo(i2s->playback_fifo_cif);
 201         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 202                            TEGRA30_I2S_CTRL_XFER_EN_TX,
 203                            TEGRA30_I2S_CTRL_XFER_EN_TX);
 204 }
 205
 206 static void tegra30_i2s_stop_playback(struct tegra30_i2s *i2s)
 207 {
 208         tegra30_ahub_disable_tx_fifo(i2s->playback_fifo_cif);
 209         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 210                            TEGRA30_I2S_CTRL_XFER_EN_TX, 0);
 211 }
 212
 213 static void tegra30_i2s_start_capture(struct tegra30_i2s *i2s)
 214 {
 215         tegra30_ahub_enable_rx_fifo(i2s->capture_fifo_cif);
 216         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 217                            TEGRA30_I2S_CTRL_XFER_EN_RX,
 218                            TEGRA30_I2S_CTRL_XFER_EN_RX);
 219 }
 220
 221 static void tegra30_i2s_stop_capture(struct tegra30_i2s *i2s)
 222 {
 223         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 224                            TEGRA30_I2S_CTRL_XFER_EN_RX, 0);
 225         tegra30_ahub_disable_rx_fifo(i2s->capture_fifo_cif);
 226 }
 227
 228 static int tegra30_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 229                                 struct snd_soc_dai *dai)
 230 {
 231         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 232
 233         switch (cmd) {
 234         case SNDRV_PCM_TRIGGER_START:
 235         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 236         case SNDRV_PCM_TRIGGER_RESUME:
 237                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 238                         tegra30_i2s_start_playback(i2s);
 239                 else
 240                         tegra30_i2s_start_capture(i2s);
 241                 break;
 242         case SNDRV_PCM_TRIGGER_STOP:
 243         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 244         case SNDRV_PCM_TRIGGER_SUSPEND:
 245                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 246                         tegra30_i2s_stop_playback(i2s);
 247                 else
 248                         tegra30_i2s_stop_capture(i2s);
 249                 break;
 250         default:
 251                 return -EINVAL;
 252         }
 253
 254         return 0;
 255 }
 256
 257 static int tegra30_i2s_set_tdm(struct snd_soc_dai *dai,
 258                                unsigned int tx_mask, unsigned int rx_mask,
 259                                int slots, int slot_width)
 260 {
 261         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 262         unsigned int mask, val;
 263
 264         dev_dbg(dai->dev, "%s: txmask=0x%08x rxmask=0x%08x slots=%d width=%d\n",
 265                  __func__, tx_mask, rx_mask, slots, slot_width);
 266
 267         mask = TEGRA30_I2S_SLOT_CTRL_TOTAL_SLOTS_MASK |
 268                TEGRA30_I2S_SLOT_CTRL_RX_SLOT_ENABLES_MASK |
 269                TEGRA30_I2S_SLOT_CTRL_TX_SLOT_ENABLES_MASK;
 270
 271         val = (tx_mask << TEGRA30_I2S_SLOT_CTRL_TX_SLOT_ENABLES_SHIFT) |
 272               (rx_mask << TEGRA30_I2S_SLOT_CTRL_RX_SLOT_ENABLES_SHIFT) |
 273               ((slots - 1) << TEGRA30_I2S_SLOT_CTRL_TOTAL_SLOTS_SHIFT);
 274
 275         pm_runtime_get_sync(dai->dev);
 276         regmap_update_bits(i2s->regmap, TEGRA30_I2S_SLOT_CTRL, mask, val);
 277         /* set the fsync width to minimum of 1 clock width */
 278         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CH_CTRL,
 279                            TEGRA30_I2S_CH_CTRL_FSYNC_WIDTH_MASK, 0x0);
 280         pm_runtime_put(dai->dev);
 281
 282         return 0;
 283 }
 284
 285 static int tegra30_i2s_probe(struct snd_soc_dai *dai)
 286 {
 287         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 288
 289         dai->capture_dma_data = &i2s->capture_dma_data;
 290         dai->playback_dma_data = &i2s->playback_dma_data;
 291
 292         return 0;
 293 }
 294
 295 static const struct snd_soc_dai_ops tegra30_i2s_dai_ops = {
 296         .set_fmt        = tegra30_i2s_set_fmt,
 297         .hw_params      = tegra30_i2s_hw_params,
 298         .trigger        = tegra30_i2s_trigger,
 299         .set_tdm_slot   = tegra30_i2s_set_tdm,
 300 };
 301
 302 static const struct snd_soc_dai_driver tegra30_i2s_dai_template = {
 303         .probe = tegra30_i2s_probe,
 304         .playback = {
 305                 .stream_name = "Playback",
 306                 .channels_min = 2,
 307                 .channels_max = 2,
 308                 .rates = SNDRV_PCM_RATE_8000_96000,
 309                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 310         },
 311         .capture = {
 312                 .stream_name = "Capture",
 313                 .channels_min = 2,
 314                 .channels_max = 2,
 315                 .rates = SNDRV_PCM_RATE_8000_96000,
 316                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 317         },
 318         .ops = &tegra30_i2s_dai_ops,
 319         .symmetric_rates = 1,
 320 };
 321
 322 static const struct snd_soc_component_driver tegra30_i2s_component = {
 323         .name           = DRV_NAME,
 324 };
 325
 326 static bool tegra30_i2s_wr_rd_reg(struct device *dev, unsigned int reg)
 327 {
 328         switch (reg) {
 329         case TEGRA30_I2S_CTRL:
 330         case TEGRA30_I2S_TIMING:
 331         case TEGRA30_I2S_OFFSET:
 332         case TEGRA30_I2S_CH_CTRL:
 333         case TEGRA30_I2S_SLOT_CTRL:
 334         case TEGRA30_I2S_CIF_RX_CTRL:
 335         case TEGRA30_I2S_CIF_TX_CTRL:
 336         case TEGRA30_I2S_FLOWCTL:
 337         case TEGRA30_I2S_TX_STEP:
 338         case TEGRA30_I2S_FLOW_STATUS:
 339         case TEGRA30_I2S_FLOW_TOTAL:
 340         case TEGRA30_I2S_FLOW_OVER:
 341         case TEGRA30_I2S_FLOW_UNDER:
 342         case TEGRA30_I2S_LCOEF_1_4_0:
 343         case TEGRA30_I2S_LCOEF_1_4_1:
 344         case TEGRA30_I2S_LCOEF_1_4_2:
 345         case TEGRA30_I2S_LCOEF_1_4_3:
 346         case TEGRA30_I2S_LCOEF_1_4_4:
 347         case TEGRA30_I2S_LCOEF_1_4_5:
 348         case TEGRA30_I2S_LCOEF_2_4_0:
 349         case TEGRA30_I2S_LCOEF_2_4_1:
 350         case TEGRA30_I2S_LCOEF_2_4_2:
 351                 return true;
 352         default:
 353                 return false;
 354         }
 355 }
 356
 357 static bool tegra30_i2s_volatile_reg(struct device *dev, unsigned int reg)
 358 {
 359         switch (reg) {
 360         case TEGRA30_I2S_FLOW_STATUS:
 361         case TEGRA30_I2S_FLOW_TOTAL:
 362         case TEGRA30_I2S_FLOW_OVER:
 363         case TEGRA30_I2S_FLOW_UNDER:
 364                 return true;
 365         default:
 366                 return false;
 367         }
 368 }
 369
 370 static const struct regmap_config tegra30_i2s_regmap_config = {
 371         .reg_bits = 32,
 372         .reg_stride = 4,
 373         .val_bits = 32,
 374         .max_register = TEGRA30_I2S_LCOEF_2_4_2,
 375         .writeable_reg = tegra30_i2s_wr_rd_reg,
 376         .readable_reg = tegra30_i2s_wr_rd_reg,
 377         .volatile_reg = tegra30_i2s_volatile_reg,
 378         .cache_type = REGCACHE_FLAT,
 379 };
 380
 381 static const struct tegra30_i2s_soc_data tegra30_i2s_config = {
 382         .set_audio_cif = tegra30_ahub_set_cif,
 383 };
 384
 385 static const struct tegra30_i2s_soc_data tegra124_i2s_config = {
 386         .set_audio_cif = tegra124_ahub_set_cif,
 387 };
 388
 389 static const struct of_device_id tegra30_i2s_of_match[] = {
 390         { .compatible = "nvidia,tegra124-i2s", .data = &tegra124_i2s_config },
 391         { .compatible = "nvidia,tegra30-i2s", .data = &tegra30_i2s_config },
 392         {},
 393 };
 394
 395 static int tegra30_i2s_platform_probe(struct platform_device *pdev)
 396 {
 397         struct tegra30_i2s *i2s;
 398         const struct of_device_id *match;
 399         u32 cif_ids[2];
 400         void __iomem *regs;
 401         int ret;
 402
 403         i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra30_i2s), GFP_KERNEL);
 404         if (!i2s) {
 405                 ret = -ENOMEM;
 406                 goto err;
 407         }
 408         dev_set_drvdata(&pdev->dev, i2s);
 409
 410         match = of_match_device(tegra30_i2s_of_match, &pdev->dev);
 411         if (!match) {
 412                 dev_err(&pdev->dev, "Error: No device match found\n");
 413                 ret = -ENODEV;
 414                 goto err;
 415         }
 416         i2s->soc_data = (struct tegra30_i2s_soc_data *)match->data;
 417
 418         i2s->dai = tegra30_i2s_dai_template;
 419         i2s->dai.name = dev_name(&pdev->dev);
 420
 421         ret = of_property_read_u32_array(pdev->dev.of_node,
 422                                          "nvidia,ahub-cif-ids", cif_ids,
 423                                          ARRAY_SIZE(cif_ids));
 424         if (ret < 0)
 425                 goto err;
 426
 427         i2s->playback_i2s_cif = cif_ids[0];
 428         i2s->capture_i2s_cif = cif_ids[1];
 429
 430         i2s->clk_i2s = clk_get(&pdev->dev, NULL);
 431         if (IS_ERR(i2s->clk_i2s)) {
 432                 dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
 433                 ret = PTR_ERR(i2s->clk_i2s);
 434                 goto err;
 435         }
 436
 437         regs = devm_platform_ioremap_resource(pdev, 0);
 438         if (IS_ERR(regs)) {
 439                 ret = PTR_ERR(regs);
 440                 goto err_clk_put;
 441         }
 442
 443         i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
 444                                             &tegra30_i2s_regmap_config);
 445         if (IS_ERR(i2s->regmap)) {
 446                 dev_err(&pdev->dev, "regmap init failed\n");
 447                 ret = PTR_ERR(i2s->regmap);
 448                 goto err_clk_put;
 449         }
 450         regcache_cache_only(i2s->regmap, true);
 451
 452         pm_runtime_enable(&pdev->dev);
 453         if (!pm_runtime_enabled(&pdev->dev)) {
 454                 ret = tegra30_i2s_runtime_resume(&pdev->dev);
 455                 if (ret)
 456                         goto err_pm_disable;
 457         }
 458
 459         i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 460         i2s->playback_dma_data.maxburst = 4;
 461         ret = tegra30_ahub_allocate_tx_fifo(&i2s->playback_fifo_cif,
 462                                             i2s->playback_dma_chan,
 463                                             sizeof(i2s->playback_dma_chan),
 464                                             &i2s->playback_dma_data.addr);
 465         if (ret) {
 466                 dev_err(&pdev->dev, "Could not alloc TX FIFO: %d\n", ret);
 467                 goto err_suspend;
 468         }
 469         ret = tegra30_ahub_set_rx_cif_source(i2s->playback_i2s_cif,
 470                                              i2s->playback_fifo_cif);
 471         if (ret) {
 472                 dev_err(&pdev->dev, "Could not route TX FIFO: %d\n", ret);
 473                 goto err_free_tx_fifo;
 474         }
 475
 476         i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 477         i2s->capture_dma_data.maxburst = 4;
 478         ret = tegra30_ahub_allocate_rx_fifo(&i2s->capture_fifo_cif,
 479                                             i2s->capture_dma_chan,
 480                                             sizeof(i2s->capture_dma_chan),
 481                                             &i2s->capture_dma_data.addr);
 482         if (ret) {
 483                 dev_err(&pdev->dev, "Could not alloc RX FIFO: %d\n", ret);
 484                 goto err_unroute_tx_fifo;
 485         }
 486         ret = tegra30_ahub_set_rx_cif_source(i2s->capture_fifo_cif,
 487                                              i2s->capture_i2s_cif);
 488         if (ret) {
 489                 dev_err(&pdev->dev, "Could not route TX FIFO: %d\n", ret);
 490                 goto err_free_rx_fifo;
 491         }
 492
 493         ret = snd_soc_register_component(&pdev->dev, &tegra30_i2s_component,
 494                                    &i2s->dai, 1);
 495         if (ret) {
 496                 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
 497                 ret = -ENOMEM;
 498                 goto err_unroute_rx_fifo;
 499         }
 500
 501         ret = tegra_pcm_platform_register_with_chan_names(&pdev->dev,
 502                                 &i2s->dma_config, i2s->playback_dma_chan,
 503                                 i2s->capture_dma_chan);
 504         if (ret) {
 505                 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
 506                 goto err_unregister_component;
 507         }
 508
 509         return 0;
 510
 511 err_unregister_component:
 512         snd_soc_unregister_component(&pdev->dev);
 513 err_unroute_rx_fifo:
 514         tegra30_ahub_unset_rx_cif_source(i2s->capture_fifo_cif);
 515 err_free_rx_fifo:
 516         tegra30_ahub_free_rx_fifo(i2s->capture_fifo_cif);
 517 err_unroute_tx_fifo:
 518         tegra30_ahub_unset_rx_cif_source(i2s->playback_i2s_cif);
 519 err_free_tx_fifo:
 520         tegra30_ahub_free_tx_fifo(i2s->playback_fifo_cif);
 521 err_suspend:
 522         if (!pm_runtime_status_suspended(&pdev->dev))
 523                 tegra30_i2s_runtime_suspend(&pdev->dev);
 524 err_pm_disable:
 525         pm_runtime_disable(&pdev->dev);
 526 err_clk_put:
 527         clk_put(i2s->clk_i2s);
 528 err:
 529         return ret;
 530 }
 531
 532 static int tegra30_i2s_platform_remove(struct platform_device *pdev)
 533 {
 534         struct tegra30_i2s *i2s = dev_get_drvdata(&pdev->dev);
 535
 536         pm_runtime_disable(&pdev->dev);
 537         if (!pm_runtime_status_suspended(&pdev->dev))
 538                 tegra30_i2s_runtime_suspend(&pdev->dev);
 539
 540         tegra_pcm_platform_unregister(&pdev->dev);
 541         snd_soc_unregister_component(&pdev->dev);
 542
 543         tegra30_ahub_unset_rx_cif_source(i2s->capture_fifo_cif);
 544         tegra30_ahub_free_rx_fifo(i2s->capture_fifo_cif);
 545
 546         tegra30_ahub_unset_rx_cif_source(i2s->playback_i2s_cif);
 547         tegra30_ahub_free_tx_fifo(i2s->playback_fifo_cif);
 548
 549         clk_put(i2s->clk_i2s);
 550
 551         return 0;
 552 }
 553
 554 #ifdef CONFIG_PM_SLEEP
 555 static int tegra30_i2s_suspend(struct device *dev)
 556 {
 557         struct tegra30_i2s *i2s = dev_get_drvdata(dev);
 558
 559         regcache_mark_dirty(i2s->regmap);
 560
 561         return 0;
 562 }
 563
 564 static int tegra30_i2s_resume(struct device *dev)
 565 {
 566         struct tegra30_i2s *i2s = dev_get_drvdata(dev);
 567         int ret;
 568
 569         ret = pm_runtime_get_sync(dev);
 570         if (ret < 0) {
 571                 pm_runtime_put(dev);
 572                 return ret;
 573         }
 574         ret = regcache_sync(i2s->regmap);
 575         pm_runtime_put(dev);
 576
 577         return ret;
 578 }
 579 #endif
 580
 581 static const struct dev_pm_ops tegra30_i2s_pm_ops = {
 582         SET_RUNTIME_PM_OPS(tegra30_i2s_runtime_suspend,
 583                            tegra30_i2s_runtime_resume, NULL)
 584         SET_SYSTEM_SLEEP_PM_OPS(tegra30_i2s_suspend, tegra30_i2s_resume)
 585 };
 586
 587 static struct platform_driver tegra30_i2s_driver = {
 588         .driver = {
 589                 .name = DRV_NAME,
 590                 .of_match_table = tegra30_i2s_of_match,
 591                 .pm = &tegra30_i2s_pm_ops,
 592         },
 593         .probe = tegra30_i2s_platform_probe,
 594         .remove = tegra30_i2s_platform_remove,
 595 };
 596 module_platform_driver(tegra30_i2s_driver);
 597
 598 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 599 MODULE_DESCRIPTION("Tegra30 I2S ASoC driver");
 600 MODULE_LICENSE("GPL");
 601 MODULE_ALIAS("platform:" DRV_NAME);
 602 MODULE_DEVICE_TABLE(of, tegra30_i2s_of_match);