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/platform_device.h>
  34 #include <linux/pm_runtime.h>
  35 #include <linux/regmap.h>
  36 #include <linux/slab.h>
  37 #include <sound/core.h>
  38 #include <sound/pcm.h>
  39 #include <sound/pcm_params.h>
  40 #include <sound/soc.h>
  41
  42 #include "tegra30_ahub.h"
  43 #include "tegra30_i2s.h"
  44
  45 #define DRV_NAME "tegra30-i2s"
  46
  47 static int tegra30_i2s_runtime_suspend(struct device *dev)
  48 {
  49         struct tegra30_i2s *i2s = dev_get_drvdata(dev);
  50
  51         regcache_cache_only(i2s->regmap, true);
  52
  53         clk_disable_unprepare(i2s->clk_i2s);
  54
  55         return 0;
  56 }
  57
  58 static int tegra30_i2s_runtime_resume(struct device *dev)
  59 {
  60         struct tegra30_i2s *i2s = dev_get_drvdata(dev);
  61         int ret;
  62
  63         ret = clk_prepare_enable(i2s->clk_i2s);
  64         if (ret) {
  65                 dev_err(dev, "clk_enable failed: %d\n", ret);
  66                 return ret;
  67         }
  68
  69         regcache_cache_only(i2s->regmap, false);
  70
  71         return 0;
  72 }
  73
  74 int tegra30_i2s_startup(struct snd_pcm_substream *substream,
  75                         struct snd_soc_dai *dai)
  76 {
  77         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
  78         int ret;
  79
  80         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  81                 ret = tegra30_ahub_allocate_tx_fifo(&i2s->playback_fifo_cif,
  82                                         &i2s->playback_dma_data.addr,
  83                                         &i2s->playback_dma_data.req_sel);
  84                 i2s->playback_dma_data.wrap = 4;
  85                 i2s->playback_dma_data.width = 32;
  86                 tegra30_ahub_set_rx_cif_source(i2s->playback_i2s_cif,
  87                                                i2s->playback_fifo_cif);
  88         } else {
  89                 ret = tegra30_ahub_allocate_rx_fifo(&i2s->capture_fifo_cif,
  90                                         &i2s->capture_dma_data.addr,
  91                                         &i2s->capture_dma_data.req_sel);
  92                 i2s->capture_dma_data.wrap = 4;
  93                 i2s->capture_dma_data.width = 32;
  94                 tegra30_ahub_set_rx_cif_source(i2s->capture_fifo_cif,
  95                                                i2s->capture_i2s_cif);
  96         }
  97
  98         return ret;
  99 }
 100
 101 void tegra30_i2s_shutdown(struct snd_pcm_substream *substream,
 102                         struct snd_soc_dai *dai)
 103 {
 104         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 105
 106         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 107                 tegra30_ahub_unset_rx_cif_source(i2s->playback_i2s_cif);
 108                 tegra30_ahub_free_tx_fifo(i2s->playback_fifo_cif);
 109         } else {
 110                 tegra30_ahub_unset_rx_cif_source(i2s->capture_fifo_cif);
 111                 tegra30_ahub_free_rx_fifo(i2s->capture_fifo_cif);
 112         }
 113 }
 114
 115 static int tegra30_i2s_set_fmt(struct snd_soc_dai *dai,
 116                                 unsigned int fmt)
 117 {
 118         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 119         unsigned int mask, val;
 120
 121         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 122         case SND_SOC_DAIFMT_NB_NF:
 123                 break;
 124         default:
 125                 return -EINVAL;
 126         }
 127
 128         mask = TEGRA30_I2S_CTRL_MASTER_ENABLE;
 129         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 130         case SND_SOC_DAIFMT_CBS_CFS:
 131                 val = TEGRA30_I2S_CTRL_MASTER_ENABLE;
 132                 break;
 133         case SND_SOC_DAIFMT_CBM_CFM:
 134                 break;
 135         default:
 136                 return -EINVAL;
 137         }
 138
 139         mask |= TEGRA30_I2S_CTRL_FRAME_FORMAT_MASK |
 140                 TEGRA30_I2S_CTRL_LRCK_MASK;
 141         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 142         case SND_SOC_DAIFMT_DSP_A:
 143                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_FSYNC;
 144                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 145                 break;
 146         case SND_SOC_DAIFMT_DSP_B:
 147                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_FSYNC;
 148                 val |= TEGRA30_I2S_CTRL_LRCK_R_LOW;
 149                 break;
 150         case SND_SOC_DAIFMT_I2S:
 151                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
 152                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 153                 break;
 154         case SND_SOC_DAIFMT_RIGHT_J:
 155                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
 156                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 157                 break;
 158         case SND_SOC_DAIFMT_LEFT_J:
 159                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
 160                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 161                 break;
 162         default:
 163                 return -EINVAL;
 164         }
 165
 166         pm_runtime_get_sync(dai->dev);
 167         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL, mask, val);
 168         pm_runtime_put(dai->dev);
 169
 170         return 0;
 171 }
 172
 173 static int tegra30_i2s_hw_params(struct snd_pcm_substream *substream,
 174                                  struct snd_pcm_hw_params *params,
 175                                  struct snd_soc_dai *dai)
 176 {
 177         struct device *dev = dai->dev;
 178         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 179         unsigned int mask, val, reg;
 180         int ret, sample_size, srate, i2sclock, bitcnt;
 181
 182         if (params_channels(params) != 2)
 183                 return -EINVAL;
 184
 185         mask = TEGRA30_I2S_CTRL_BIT_SIZE_MASK;
 186         switch (params_format(params)) {
 187         case SNDRV_PCM_FORMAT_S16_LE:
 188                 val = TEGRA30_I2S_CTRL_BIT_SIZE_16;
 189                 sample_size = 16;
 190                 break;
 191         default:
 192                 return -EINVAL;
 193         }
 194
 195         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL, mask, val);
 196
 197         srate = params_rate(params);
 198
 199         /* Final "* 2" required by Tegra hardware */
 200         i2sclock = srate * params_channels(params) * sample_size * 2;
 201
 202         bitcnt = (i2sclock / (2 * srate)) - 1;
 203         if (bitcnt < 0 || bitcnt > TEGRA30_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
 204                 return -EINVAL;
 205
 206         ret = clk_set_rate(i2s->clk_i2s, i2sclock);
 207         if (ret) {
 208                 dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
 209                 return ret;
 210         }
 211
 212         val = bitcnt << TEGRA30_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
 213
 214         if (i2sclock % (2 * srate))
 215                 val |= TEGRA30_I2S_TIMING_NON_SYM_ENABLE;
 216
 217         regmap_write(i2s->regmap, TEGRA30_I2S_TIMING, val);
 218
 219         val = (0 << TEGRA30_AUDIOCIF_CTRL_FIFO_THRESHOLD_SHIFT) |
 220               (1 << TEGRA30_AUDIOCIF_CTRL_AUDIO_CHANNELS_SHIFT) |
 221               (1 << TEGRA30_AUDIOCIF_CTRL_CLIENT_CHANNELS_SHIFT) |
 222               TEGRA30_AUDIOCIF_CTRL_AUDIO_BITS_16 |
 223               TEGRA30_AUDIOCIF_CTRL_CLIENT_BITS_16;
 224
 225         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 226                 val |= TEGRA30_AUDIOCIF_CTRL_DIRECTION_RX;
 227                 reg = TEGRA30_I2S_CIF_RX_CTRL;
 228         } else {
 229                 val |= TEGRA30_AUDIOCIF_CTRL_DIRECTION_TX;
 230                 reg = TEGRA30_I2S_CIF_RX_CTRL;
 231         }
 232
 233         regmap_write(i2s->regmap, reg, val);
 234
 235         val = (1 << TEGRA30_I2S_OFFSET_RX_DATA_OFFSET_SHIFT) |
 236               (1 << TEGRA30_I2S_OFFSET_TX_DATA_OFFSET_SHIFT);
 237         regmap_write(i2s->regmap, TEGRA30_I2S_OFFSET, val);
 238
 239         return 0;
 240 }
 241
 242 static void tegra30_i2s_start_playback(struct tegra30_i2s *i2s)
 243 {
 244         tegra30_ahub_enable_tx_fifo(i2s->playback_fifo_cif);
 245         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 246                            TEGRA30_I2S_CTRL_XFER_EN_TX,
 247                            TEGRA30_I2S_CTRL_XFER_EN_TX);
 248 }
 249
 250 static void tegra30_i2s_stop_playback(struct tegra30_i2s *i2s)
 251 {
 252         tegra30_ahub_disable_tx_fifo(i2s->playback_fifo_cif);
 253         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 254                            TEGRA30_I2S_CTRL_XFER_EN_TX, 0);
 255 }
 256
 257 static void tegra30_i2s_start_capture(struct tegra30_i2s *i2s)
 258 {
 259         tegra30_ahub_enable_rx_fifo(i2s->capture_fifo_cif);
 260         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 261                            TEGRA30_I2S_CTRL_XFER_EN_RX,
 262                            TEGRA30_I2S_CTRL_XFER_EN_RX);
 263 }
 264
 265 static void tegra30_i2s_stop_capture(struct tegra30_i2s *i2s)
 266 {
 267         tegra30_ahub_disable_rx_fifo(i2s->capture_fifo_cif);
 268         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 269                            TEGRA30_I2S_CTRL_XFER_EN_RX, 0);
 270 }
 271
 272 static int tegra30_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 273                                 struct snd_soc_dai *dai)
 274 {
 275         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 276
 277         switch (cmd) {
 278         case SNDRV_PCM_TRIGGER_START:
 279         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 280         case SNDRV_PCM_TRIGGER_RESUME:
 281                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 282                         tegra30_i2s_start_playback(i2s);
 283                 else
 284                         tegra30_i2s_start_capture(i2s);
 285                 break;
 286         case SNDRV_PCM_TRIGGER_STOP:
 287         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 288         case SNDRV_PCM_TRIGGER_SUSPEND:
 289                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 290                         tegra30_i2s_stop_playback(i2s);
 291                 else
 292                         tegra30_i2s_stop_capture(i2s);
 293                 break;
 294         default:
 295                 return -EINVAL;
 296         }
 297
 298         return 0;
 299 }
 300
 301 static int tegra30_i2s_probe(struct snd_soc_dai *dai)
 302 {
 303         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 304
 305         dai->capture_dma_data = &i2s->capture_dma_data;
 306         dai->playback_dma_data = &i2s->playback_dma_data;
 307
 308         return 0;
 309 }
 310
 311 static struct snd_soc_dai_ops tegra30_i2s_dai_ops = {
 312         .startup        = tegra30_i2s_startup,
 313         .shutdown       = tegra30_i2s_shutdown,
 314         .set_fmt        = tegra30_i2s_set_fmt,
 315         .hw_params      = tegra30_i2s_hw_params,
 316         .trigger        = tegra30_i2s_trigger,
 317 };
 318
 319 static const struct snd_soc_dai_driver tegra30_i2s_dai_template = {
 320         .probe = tegra30_i2s_probe,
 321         .playback = {
 322                 .stream_name = "Playback",
 323                 .channels_min = 2,
 324                 .channels_max = 2,
 325                 .rates = SNDRV_PCM_RATE_8000_96000,
 326                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 327         },
 328         .capture = {
 329                 .stream_name = "Capture",
 330                 .channels_min = 2,
 331                 .channels_max = 2,
 332                 .rates = SNDRV_PCM_RATE_8000_96000,
 333                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 334         },
 335         .ops = &tegra30_i2s_dai_ops,
 336         .symmetric_rates = 1,
 337 };
 338
 339 static bool tegra30_i2s_wr_rd_reg(struct device *dev, unsigned int reg)
 340 {
 341         switch (reg) {
 342         case TEGRA30_I2S_CTRL:
 343         case TEGRA30_I2S_TIMING:
 344         case TEGRA30_I2S_OFFSET:
 345         case TEGRA30_I2S_CH_CTRL:
 346         case TEGRA30_I2S_SLOT_CTRL:
 347         case TEGRA30_I2S_CIF_RX_CTRL:
 348         case TEGRA30_I2S_CIF_TX_CTRL:
 349         case TEGRA30_I2S_FLOWCTL:
 350         case TEGRA30_I2S_TX_STEP:
 351         case TEGRA30_I2S_FLOW_STATUS:
 352         case TEGRA30_I2S_FLOW_TOTAL:
 353         case TEGRA30_I2S_FLOW_OVER:
 354         case TEGRA30_I2S_FLOW_UNDER:
 355         case TEGRA30_I2S_LCOEF_1_4_0:
 356         case TEGRA30_I2S_LCOEF_1_4_1:
 357         case TEGRA30_I2S_LCOEF_1_4_2:
 358         case TEGRA30_I2S_LCOEF_1_4_3:
 359         case TEGRA30_I2S_LCOEF_1_4_4:
 360         case TEGRA30_I2S_LCOEF_1_4_5:
 361         case TEGRA30_I2S_LCOEF_2_4_0:
 362         case TEGRA30_I2S_LCOEF_2_4_1:
 363         case TEGRA30_I2S_LCOEF_2_4_2:
 364                 return true;
 365         default:
 366                 return false;
 367         };
 368 }
 369
 370 static bool tegra30_i2s_volatile_reg(struct device *dev, unsigned int reg)
 371 {
 372         switch (reg) {
 373         case TEGRA30_I2S_FLOW_STATUS:
 374         case TEGRA30_I2S_FLOW_TOTAL:
 375         case TEGRA30_I2S_FLOW_OVER:
 376         case TEGRA30_I2S_FLOW_UNDER:
 377                 return true;
 378         default:
 379                 return false;
 380         };
 381 }
 382
 383 static const struct regmap_config tegra30_i2s_regmap_config = {
 384         .reg_bits = 32,
 385         .reg_stride = 4,
 386         .val_bits = 32,
 387         .max_register = TEGRA30_I2S_LCOEF_2_4_2,
 388         .writeable_reg = tegra30_i2s_wr_rd_reg,
 389         .readable_reg = tegra30_i2s_wr_rd_reg,
 390         .volatile_reg = tegra30_i2s_volatile_reg,
 391         .cache_type = REGCACHE_RBTREE,
 392 };
 393
 394 static int tegra30_i2s_platform_probe(struct platform_device *pdev)
 395 {
 396         struct tegra30_i2s *i2s;
 397         u32 cif_ids[2];
 398         struct resource *mem, *memregion;
 399         void __iomem *regs;
 400         int ret;
 401
 402         i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra30_i2s), GFP_KERNEL);
 403         if (!i2s) {
 404                 dev_err(&pdev->dev, "Can't allocate tegra30_i2s\n");
 405                 ret = -ENOMEM;
 406                 goto err;
 407         }
 408         dev_set_drvdata(&pdev->dev, i2s);
 409
 410         i2s->dai = tegra30_i2s_dai_template;
 411         i2s->dai.name = dev_name(&pdev->dev);
 412
 413         ret = of_property_read_u32_array(pdev->dev.of_node,
 414                                          "nvidia,ahub-cif-ids", cif_ids,
 415                                          ARRAY_SIZE(cif_ids));
 416         if (ret < 0)
 417                 goto err;
 418
 419         i2s->playback_i2s_cif = cif_ids[0];
 420         i2s->capture_i2s_cif = cif_ids[1];
 421
 422         i2s->clk_i2s = clk_get(&pdev->dev, NULL);
 423         if (IS_ERR(i2s->clk_i2s)) {
 424                 dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
 425                 ret = PTR_ERR(i2s->clk_i2s);
 426                 goto err;
 427         }
 428
 429         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 430         if (!mem) {
 431                 dev_err(&pdev->dev, "No memory resource\n");
 432                 ret = -ENODEV;
 433                 goto err_clk_put;
 434         }
 435
 436         memregion = devm_request_mem_region(&pdev->dev, mem->start,
 437                                             resource_size(mem), DRV_NAME);
 438         if (!memregion) {
 439                 dev_err(&pdev->dev, "Memory region already claimed\n");
 440                 ret = -EBUSY;
 441                 goto err_clk_put;
 442         }
 443
 444         regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
 445         if (!regs) {
 446                 dev_err(&pdev->dev, "ioremap failed\n");
 447                 ret = -ENOMEM;
 448                 goto err_clk_put;
 449         }
 450
 451         i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
 452                                             &tegra30_i2s_regmap_config);
 453         if (IS_ERR(i2s->regmap)) {
 454                 dev_err(&pdev->dev, "regmap init failed\n");
 455                 ret = PTR_ERR(i2s->regmap);
 456                 goto err_clk_put;
 457         }
 458         regcache_cache_only(i2s->regmap, true);
 459
 460         pm_runtime_enable(&pdev->dev);
 461         if (!pm_runtime_enabled(&pdev->dev)) {
 462                 ret = tegra30_i2s_runtime_resume(&pdev->dev);
 463                 if (ret)
 464                         goto err_pm_disable;
 465         }
 466
 467         ret = snd_soc_register_dai(&pdev->dev, &i2s->dai);
 468         if (ret) {
 469                 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
 470                 ret = -ENOMEM;
 471                 goto err_suspend;
 472         }
 473
 474         ret = tegra_pcm_platform_register(&pdev->dev);
 475         if (ret) {
 476                 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
 477                 goto err_unregister_dai;
 478         }
 479
 480         return 0;
 481
 482 err_unregister_dai:
 483         snd_soc_unregister_dai(&pdev->dev);
 484 err_suspend:
 485         if (!pm_runtime_status_suspended(&pdev->dev))
 486                 tegra30_i2s_runtime_suspend(&pdev->dev);
 487 err_pm_disable:
 488         pm_runtime_disable(&pdev->dev);
 489 err_clk_put:
 490         clk_put(i2s->clk_i2s);
 491 err:
 492         return ret;
 493 }
 494
 495 static int tegra30_i2s_platform_remove(struct platform_device *pdev)
 496 {
 497         struct tegra30_i2s *i2s = dev_get_drvdata(&pdev->dev);
 498
 499         pm_runtime_disable(&pdev->dev);
 500         if (!pm_runtime_status_suspended(&pdev->dev))
 501                 tegra30_i2s_runtime_suspend(&pdev->dev);
 502
 503         tegra_pcm_platform_unregister(&pdev->dev);
 504         snd_soc_unregister_dai(&pdev->dev);
 505
 506         clk_put(i2s->clk_i2s);
 507
 508         return 0;
 509 }
 510
 511 static const struct of_device_id tegra30_i2s_of_match[] = {
 512         { .compatible = "nvidia,tegra30-i2s", },
 513         {},
 514 };
 515
 516 static const struct dev_pm_ops tegra30_i2s_pm_ops = {
 517         SET_RUNTIME_PM_OPS(tegra30_i2s_runtime_suspend,
 518                            tegra30_i2s_runtime_resume, NULL)
 519 };
 520
 521 static struct platform_driver tegra30_i2s_driver = {
 522         .driver = {
 523                 .name = DRV_NAME,
 524                 .owner = THIS_MODULE,
 525                 .of_match_table = tegra30_i2s_of_match,
 526                 .pm = &tegra30_i2s_pm_ops,
 527         },
 528         .probe = tegra30_i2s_platform_probe,
 529         .remove = tegra30_i2s_platform_remove,
 530 };
 531 module_platform_driver(tegra30_i2s_driver);
 532
 533 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 534 MODULE_DESCRIPTION("Tegra30 I2S ASoC driver");
 535 MODULE_LICENSE("GPL");
 536 MODULE_ALIAS("platform:" DRV_NAME);
 537 MODULE_DEVICE_TABLE(of, tegra30_i2s_of_match);