sound/soc/tegra/tegra30_i2s.c

   1 /*
   2  * tegra30_i2s.c - Tegra30 I2S driver
   3  *
   4  * Author: Stephen Warren <swarren@nvidia.com>
   5  * Copyright (c) 2010-2012, NVIDIA CORPORATION.  All rights reserved.
   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 modify it
  16  * under the terms and conditions 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 it will be useful, but WITHOUT
  20  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  21  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  22  * more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  26  */
  27
  28 #include <linux/clk.h>
  29 #include <linux/device.h>
  30 #include <linux/io.h>
  31 #include <linux/module.h>
  32 #include <linux/of.h>
  33 #include <linux/of_device.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/pm_runtime.h>
  36 #include <linux/regmap.h>
  37 #include <linux/slab.h>
  38 #include <sound/core.h>
  39 #include <sound/pcm.h>
  40 #include <sound/pcm_params.h>
  41 #include <sound/soc.h>
  42 #include <sound/dmaengine_pcm.h>
  43
  44 #include "tegra30_ahub.h"
  45 #include "tegra30_i2s.h"
  46
  47 #define DRV_NAME "tegra30-i2s"
  48
  49 static int tegra30_i2s_runtime_suspend(struct device *dev)
  50 {
  51         struct tegra30_i2s *i2s = dev_get_drvdata(dev);
  52
  53         regcache_cache_only(i2s->regmap, true);
  54
  55         clk_disable_unprepare(i2s->clk_i2s);
  56
  57         return 0;
  58 }
  59
  60 static int tegra30_i2s_runtime_resume(struct device *dev)
  61 {
  62         struct tegra30_i2s *i2s = dev_get_drvdata(dev);
  63         int ret;
  64
  65         ret = clk_prepare_enable(i2s->clk_i2s);
  66         if (ret) {
  67                 dev_err(dev, "clk_enable failed: %d\n", ret);
  68                 return ret;
  69         }
  70
  71         regcache_cache_only(i2s->regmap, false);
  72
  73         return 0;
  74 }
  75
  76 static int tegra30_i2s_set_fmt(struct snd_soc_dai *dai,
  77                                 unsigned int fmt)
  78 {
  79         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
  80         unsigned int mask = 0, val = 0;
  81
  82         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
  83         case SND_SOC_DAIFMT_NB_NF:
  84                 break;
  85         default:
  86                 return -EINVAL;
  87         }
  88
  89         mask |= TEGRA30_I2S_CTRL_MASTER_ENABLE;
  90         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
  91         case SND_SOC_DAIFMT_CBS_CFS:
  92                 val |= TEGRA30_I2S_CTRL_MASTER_ENABLE;
  93                 break;
  94         case SND_SOC_DAIFMT_CBM_CFM:
  95                 break;
  96         default:
  97                 return -EINVAL;
  98         }
  99
 100         mask |= TEGRA30_I2S_CTRL_FRAME_FORMAT_MASK |
 101                 TEGRA30_I2S_CTRL_LRCK_MASK;
 102         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 103         case SND_SOC_DAIFMT_DSP_A:
 104                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_FSYNC;
 105                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 106                 break;
 107         case SND_SOC_DAIFMT_DSP_B:
 108                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_FSYNC;
 109                 val |= TEGRA30_I2S_CTRL_LRCK_R_LOW;
 110                 break;
 111         case SND_SOC_DAIFMT_I2S:
 112                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
 113                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 114                 break;
 115         case SND_SOC_DAIFMT_RIGHT_J:
 116                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
 117                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 118                 break;
 119         case SND_SOC_DAIFMT_LEFT_J:
 120                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
 121                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 122                 break;
 123         default:
 124                 return -EINVAL;
 125         }
 126
 127         pm_runtime_get_sync(dai->dev);
 128         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL, mask, val);
 129         pm_runtime_put(dai->dev);
 130
 131         return 0;
 132 }
 133
 134 static int tegra30_i2s_hw_params(struct snd_pcm_substream *substream,
 135                                  struct snd_pcm_hw_params *params,
 136                                  struct snd_soc_dai *dai)
 137 {
 138         struct device *dev = dai->dev;
 139         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 140         unsigned int mask, val, reg;
 141         int ret, sample_size, srate, i2sclock, bitcnt;
 142         struct tegra30_ahub_cif_conf cif_conf;
 143
 144         if (params_channels(params) != 2)
 145                 return -EINVAL;
 146
 147         mask = TEGRA30_I2S_CTRL_BIT_SIZE_MASK;
 148         switch (params_format(params)) {
 149         case SNDRV_PCM_FORMAT_S16_LE:
 150                 val = TEGRA30_I2S_CTRL_BIT_SIZE_16;
 151                 sample_size = 16;
 152                 break;
 153         default:
 154                 return -EINVAL;
 155         }
 156
 157         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL, mask, val);
 158
 159         srate = params_rate(params);
 160
 161         /* Final "* 2" required by Tegra hardware */
 162         i2sclock = srate * params_channels(params) * sample_size * 2;
 163
 164         bitcnt = (i2sclock / (2 * srate)) - 1;
 165         if (bitcnt < 0 || bitcnt > TEGRA30_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
 166                 return -EINVAL;
 167
 168         ret = clk_set_rate(i2s->clk_i2s, i2sclock);
 169         if (ret) {
 170                 dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
 171                 return ret;
 172         }
 173
 174         val = bitcnt << TEGRA30_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
 175
 176         if (i2sclock % (2 * srate))
 177                 val |= TEGRA30_I2S_TIMING_NON_SYM_ENABLE;
 178
 179         regmap_write(i2s->regmap, TEGRA30_I2S_TIMING, val);
 180
 181         cif_conf.threshold = 0;
 182         cif_conf.audio_channels = 2;
 183         cif_conf.client_channels = 2;
 184         cif_conf.audio_bits = TEGRA30_AUDIOCIF_BITS_16;
 185         cif_conf.client_bits = TEGRA30_AUDIOCIF_BITS_16;
 186         cif_conf.expand = 0;
 187         cif_conf.stereo_conv = 0;
 188         cif_conf.replicate = 0;
 189         cif_conf.truncate = 0;
 190         cif_conf.mono_conv = 0;
 191
 192         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 193                 cif_conf.direction = TEGRA30_AUDIOCIF_DIRECTION_RX;
 194                 reg = TEGRA30_I2S_CIF_RX_CTRL;
 195         } else {
 196                 cif_conf.direction = TEGRA30_AUDIOCIF_DIRECTION_TX;
 197                 reg = TEGRA30_I2S_CIF_TX_CTRL;
 198         }
 199
 200         i2s->soc_data->set_audio_cif(i2s->regmap, reg, &cif_conf);
 201
 202         val = (1 << TEGRA30_I2S_OFFSET_RX_DATA_OFFSET_SHIFT) |
 203               (1 << TEGRA30_I2S_OFFSET_TX_DATA_OFFSET_SHIFT);
 204         regmap_write(i2s->regmap, TEGRA30_I2S_OFFSET, val);
 205
 206         return 0;
 207 }
 208
 209 static void tegra30_i2s_start_playback(struct tegra30_i2s *i2s)
 210 {
 211         tegra30_ahub_enable_tx_fifo(i2s->playback_fifo_cif);
 212         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 213                            TEGRA30_I2S_CTRL_XFER_EN_TX,
 214                            TEGRA30_I2S_CTRL_XFER_EN_TX);
 215 }
 216
 217 static void tegra30_i2s_stop_playback(struct tegra30_i2s *i2s)
 218 {
 219         tegra30_ahub_disable_tx_fifo(i2s->playback_fifo_cif);
 220         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 221                            TEGRA30_I2S_CTRL_XFER_EN_TX, 0);
 222 }
 223
 224 static void tegra30_i2s_start_capture(struct tegra30_i2s *i2s)
 225 {
 226         tegra30_ahub_enable_rx_fifo(i2s->capture_fifo_cif);
 227         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 228                            TEGRA30_I2S_CTRL_XFER_EN_RX,
 229                            TEGRA30_I2S_CTRL_XFER_EN_RX);
 230 }
 231
 232 static void tegra30_i2s_stop_capture(struct tegra30_i2s *i2s)
 233 {
 234         tegra30_ahub_disable_rx_fifo(i2s->capture_fifo_cif);
 235         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 236                            TEGRA30_I2S_CTRL_XFER_EN_RX, 0);
 237 }
 238
 239 static int tegra30_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 240                                 struct snd_soc_dai *dai)
 241 {
 242         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 243
 244         switch (cmd) {
 245         case SNDRV_PCM_TRIGGER_START:
 246         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 247         case SNDRV_PCM_TRIGGER_RESUME:
 248                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 249                         tegra30_i2s_start_playback(i2s);
 250                 else
 251                         tegra30_i2s_start_capture(i2s);
 252                 break;
 253         case SNDRV_PCM_TRIGGER_STOP:
 254         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 255         case SNDRV_PCM_TRIGGER_SUSPEND:
 256                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 257                         tegra30_i2s_stop_playback(i2s);
 258                 else
 259                         tegra30_i2s_stop_capture(i2s);
 260                 break;
 261         default:
 262                 return -EINVAL;
 263         }
 264
 265         return 0;
 266 }
 267
 268 static int tegra30_i2s_probe(struct snd_soc_dai *dai)
 269 {
 270         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 271
 272         dai->capture_dma_data = &i2s->capture_dma_data;
 273         dai->playback_dma_data = &i2s->playback_dma_data;
 274
 275         return 0;
 276 }
 277
 278 static struct snd_soc_dai_ops tegra30_i2s_dai_ops = {
 279         .set_fmt        = tegra30_i2s_set_fmt,
 280         .hw_params      = tegra30_i2s_hw_params,
 281         .trigger        = tegra30_i2s_trigger,
 282 };
 283
 284 static const struct snd_soc_dai_driver tegra30_i2s_dai_template = {
 285         .probe = tegra30_i2s_probe,
 286         .playback = {
 287                 .stream_name = "Playback",
 288                 .channels_min = 2,
 289                 .channels_max = 2,
 290                 .rates = SNDRV_PCM_RATE_8000_96000,
 291                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 292         },
 293         .capture = {
 294                 .stream_name = "Capture",
 295                 .channels_min = 2,
 296                 .channels_max = 2,
 297                 .rates = SNDRV_PCM_RATE_8000_96000,
 298                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 299         },
 300         .ops = &tegra30_i2s_dai_ops,
 301         .symmetric_rates = 1,
 302 };
 303
 304 static const struct snd_soc_component_driver tegra30_i2s_component = {
 305         .name           = DRV_NAME,
 306 };
 307
 308 static bool tegra30_i2s_wr_rd_reg(struct device *dev, unsigned int reg)
 309 {
 310         switch (reg) {
 311         case TEGRA30_I2S_CTRL:
 312         case TEGRA30_I2S_TIMING:
 313         case TEGRA30_I2S_OFFSET:
 314         case TEGRA30_I2S_CH_CTRL:
 315         case TEGRA30_I2S_SLOT_CTRL:
 316         case TEGRA30_I2S_CIF_RX_CTRL:
 317         case TEGRA30_I2S_CIF_TX_CTRL:
 318         case TEGRA30_I2S_FLOWCTL:
 319         case TEGRA30_I2S_TX_STEP:
 320         case TEGRA30_I2S_FLOW_STATUS:
 321         case TEGRA30_I2S_FLOW_TOTAL:
 322         case TEGRA30_I2S_FLOW_OVER:
 323         case TEGRA30_I2S_FLOW_UNDER:
 324         case TEGRA30_I2S_LCOEF_1_4_0:
 325         case TEGRA30_I2S_LCOEF_1_4_1:
 326         case TEGRA30_I2S_LCOEF_1_4_2:
 327         case TEGRA30_I2S_LCOEF_1_4_3:
 328         case TEGRA30_I2S_LCOEF_1_4_4:
 329         case TEGRA30_I2S_LCOEF_1_4_5:
 330         case TEGRA30_I2S_LCOEF_2_4_0:
 331         case TEGRA30_I2S_LCOEF_2_4_1:
 332         case TEGRA30_I2S_LCOEF_2_4_2:
 333                 return true;
 334         default:
 335                 return false;
 336         }
 337 }
 338
 339 static bool tegra30_i2s_volatile_reg(struct device *dev, unsigned int reg)
 340 {
 341         switch (reg) {
 342         case TEGRA30_I2S_FLOW_STATUS:
 343         case TEGRA30_I2S_FLOW_TOTAL:
 344         case TEGRA30_I2S_FLOW_OVER:
 345         case TEGRA30_I2S_FLOW_UNDER:
 346                 return true;
 347         default:
 348                 return false;
 349         }
 350 }
 351
 352 static const struct regmap_config tegra30_i2s_regmap_config = {
 353         .reg_bits = 32,
 354         .reg_stride = 4,
 355         .val_bits = 32,
 356         .max_register = TEGRA30_I2S_LCOEF_2_4_2,
 357         .writeable_reg = tegra30_i2s_wr_rd_reg,
 358         .readable_reg = tegra30_i2s_wr_rd_reg,
 359         .volatile_reg = tegra30_i2s_volatile_reg,
 360         .cache_type = REGCACHE_FLAT,
 361 };
 362
 363 static const struct tegra30_i2s_soc_data tegra30_i2s_config = {
 364         .set_audio_cif = tegra30_ahub_set_cif,
 365 };
 366
 367 static const struct tegra30_i2s_soc_data tegra124_i2s_config = {
 368         .set_audio_cif = tegra124_ahub_set_cif,
 369 };
 370
 371 static const struct of_device_id tegra30_i2s_of_match[] = {
 372         { .compatible = "nvidia,tegra124-i2s", .data = &tegra124_i2s_config },
 373         { .compatible = "nvidia,tegra30-i2s", .data = &tegra30_i2s_config },
 374         {},
 375 };
 376
 377 static int tegra30_i2s_platform_probe(struct platform_device *pdev)
 378 {
 379         struct tegra30_i2s *i2s;
 380         const struct of_device_id *match;
 381         u32 cif_ids[2];
 382         struct resource *mem, *memregion;
 383         void __iomem *regs;
 384         int ret;
 385
 386         i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra30_i2s), GFP_KERNEL);
 387         if (!i2s) {
 388                 dev_err(&pdev->dev, "Can't allocate tegra30_i2s\n");
 389                 ret = -ENOMEM;
 390                 goto err;
 391         }
 392         dev_set_drvdata(&pdev->dev, i2s);
 393
 394         match = of_match_device(tegra30_i2s_of_match, &pdev->dev);
 395         if (!match) {
 396                 dev_err(&pdev->dev, "Error: No device match found\n");
 397                 ret = -ENODEV;
 398                 goto err;
 399         }
 400         i2s->soc_data = (struct tegra30_i2s_soc_data *)match->data;
 401
 402         i2s->dai = tegra30_i2s_dai_template;
 403         i2s->dai.name = dev_name(&pdev->dev);
 404
 405         ret = of_property_read_u32_array(pdev->dev.of_node,
 406                                          "nvidia,ahub-cif-ids", cif_ids,
 407                                          ARRAY_SIZE(cif_ids));
 408         if (ret < 0)
 409                 goto err;
 410
 411         i2s->playback_i2s_cif = cif_ids[0];
 412         i2s->capture_i2s_cif = cif_ids[1];
 413
 414         i2s->clk_i2s = clk_get(&pdev->dev, NULL);
 415         if (IS_ERR(i2s->clk_i2s)) {
 416                 dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
 417                 ret = PTR_ERR(i2s->clk_i2s);
 418                 goto err;
 419         }
 420
 421         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 422         if (!mem) {
 423                 dev_err(&pdev->dev, "No memory resource\n");
 424                 ret = -ENODEV;
 425                 goto err_clk_put;
 426         }
 427
 428         memregion = devm_request_mem_region(&pdev->dev, mem->start,
 429                                             resource_size(mem), DRV_NAME);
 430         if (!memregion) {
 431                 dev_err(&pdev->dev, "Memory region already claimed\n");
 432                 ret = -EBUSY;
 433                 goto err_clk_put;
 434         }
 435
 436         regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
 437         if (!regs) {
 438                 dev_err(&pdev->dev, "ioremap failed\n");
 439                 ret = -ENOMEM;
 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                 return ret;
 572         ret = regcache_sync(i2s->regmap);
 573         pm_runtime_put(dev);
 574
 575         return ret;
 576 }
 577 #endif
 578
 579 static const struct dev_pm_ops tegra30_i2s_pm_ops = {
 580         SET_RUNTIME_PM_OPS(tegra30_i2s_runtime_suspend,
 581                            tegra30_i2s_runtime_resume, NULL)
 582         SET_SYSTEM_SLEEP_PM_OPS(tegra30_i2s_suspend, tegra30_i2s_resume)
 583 };
 584
 585 static struct platform_driver tegra30_i2s_driver = {
 586         .driver = {
 587                 .name = DRV_NAME,
 588                 .of_match_table = tegra30_i2s_of_match,
 589                 .pm = &tegra30_i2s_pm_ops,
 590         },
 591         .probe = tegra30_i2s_platform_probe,
 592         .remove = tegra30_i2s_platform_remove,
 593 };
 594 module_platform_driver(tegra30_i2s_driver);
 595
 596 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 597 MODULE_DESCRIPTION("Tegra30 I2S ASoC driver");
 598 MODULE_LICENSE("GPL");
 599 MODULE_ALIAS("platform:" DRV_NAME);
 600 MODULE_DEVICE_TABLE(of, tegra30_i2s_of_match);