kernel/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 #include <sound/dmaengine_pcm.h>
  45
  46 #include "tegra20_i2s.h"
  47
  48 #define DRV_NAME "tegra20-i2s"
  49
  50 static int tegra20_i2s_runtime_suspend(struct device *dev)
  51 {
  52         struct tegra20_i2s *i2s = dev_get_drvdata(dev);
  53
  54         clk_disable_unprepare(i2s->clk_i2s);
  55
  56         return 0;
  57 }
  58
  59 static int tegra20_i2s_runtime_resume(struct device *dev)
  60 {
  61         struct tegra20_i2s *i2s = dev_get_drvdata(dev);
  62         int ret;
  63
  64         ret = clk_prepare_enable(i2s->clk_i2s);
  65         if (ret) {
  66                 dev_err(dev, "clk_enable failed: %d\n", ret);
  67                 return ret;
  68         }
  69
  70         return 0;
  71 }
  72
  73 static int tegra20_i2s_set_fmt(struct snd_soc_dai *dai,
  74                                 unsigned int fmt)
  75 {
  76         struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
  77         unsigned int mask = 0, val = 0;
  78
  79         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
  80         case SND_SOC_DAIFMT_NB_NF:
  81                 break;
  82         default:
  83                 return -EINVAL;
  84         }
  85
  86         mask |= TEGRA20_I2S_CTRL_MASTER_ENABLE;
  87         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
  88         case SND_SOC_DAIFMT_CBS_CFS:
  89                 val |= TEGRA20_I2S_CTRL_MASTER_ENABLE;
  90                 break;
  91         case SND_SOC_DAIFMT_CBM_CFM:
  92                 break;
  93         default:
  94                 return -EINVAL;
  95         }
  96
  97         mask |= TEGRA20_I2S_CTRL_BIT_FORMAT_MASK |
  98                 TEGRA20_I2S_CTRL_LRCK_MASK;
  99         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 100         case SND_SOC_DAIFMT_DSP_A:
 101                 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
 102                 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
 103                 break;
 104         case SND_SOC_DAIFMT_DSP_B:
 105                 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
 106                 val |= TEGRA20_I2S_CTRL_LRCK_R_LOW;
 107                 break;
 108         case SND_SOC_DAIFMT_I2S:
 109                 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_I2S;
 110                 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
 111                 break;
 112         case SND_SOC_DAIFMT_RIGHT_J:
 113                 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_RJM;
 114                 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
 115                 break;
 116         case SND_SOC_DAIFMT_LEFT_J:
 117                 val |= TEGRA20_I2S_CTRL_BIT_FORMAT_LJM;
 118                 val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
 119                 break;
 120         default:
 121                 return -EINVAL;
 122         }
 123
 124         regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL, mask, val);
 125
 126         return 0;
 127 }
 128
 129 static int tegra20_i2s_hw_params(struct snd_pcm_substream *substream,
 130                                  struct snd_pcm_hw_params *params,
 131                                  struct snd_soc_dai *dai)
 132 {
 133         struct device *dev = dai->dev;
 134         struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 135         unsigned int mask, val;
 136         int ret, sample_size, srate, i2sclock, bitcnt;
 137
 138         mask = TEGRA20_I2S_CTRL_BIT_SIZE_MASK;
 139         switch (params_format(params)) {
 140         case SNDRV_PCM_FORMAT_S16_LE:
 141                 val = TEGRA20_I2S_CTRL_BIT_SIZE_16;
 142                 sample_size = 16;
 143                 break;
 144         case SNDRV_PCM_FORMAT_S24_LE:
 145                 val = TEGRA20_I2S_CTRL_BIT_SIZE_24;
 146                 sample_size = 24;
 147                 break;
 148         case SNDRV_PCM_FORMAT_S32_LE:
 149                 val = TEGRA20_I2S_CTRL_BIT_SIZE_32;
 150                 sample_size = 32;
 151                 break;
 152         default:
 153                 return -EINVAL;
 154         }
 155
 156         mask |= TEGRA20_I2S_CTRL_FIFO_FORMAT_MASK;
 157         val |= TEGRA20_I2S_CTRL_FIFO_FORMAT_PACKED;
 158
 159         regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL, mask, val);
 160
 161         srate = params_rate(params);
 162
 163         /* Final "* 2" required by Tegra hardware */
 164         i2sclock = srate * params_channels(params) * sample_size * 2;
 165
 166         ret = clk_set_rate(i2s->clk_i2s, i2sclock);
 167         if (ret) {
 168                 dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
 169                 return ret;
 170         }
 171
 172         bitcnt = (i2sclock / (2 * srate)) - 1;
 173         if (bitcnt < 0 || bitcnt > TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
 174                 return -EINVAL;
 175         val = bitcnt << TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
 176
 177         if (i2sclock % (2 * srate))
 178                 val |= TEGRA20_I2S_TIMING_NON_SYM_ENABLE;
 179
 180         regmap_write(i2s->regmap, TEGRA20_I2S_TIMING, val);
 181
 182         regmap_write(i2s->regmap, TEGRA20_I2S_FIFO_SCR,
 183                      TEGRA20_I2S_FIFO_SCR_FIFO2_ATN_LVL_FOUR_SLOTS |
 184                      TEGRA20_I2S_FIFO_SCR_FIFO1_ATN_LVL_FOUR_SLOTS);
 185
 186         return 0;
 187 }
 188
 189 static void tegra20_i2s_start_playback(struct tegra20_i2s *i2s)
 190 {
 191         regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
 192                            TEGRA20_I2S_CTRL_FIFO1_ENABLE,
 193                            TEGRA20_I2S_CTRL_FIFO1_ENABLE);
 194 }
 195
 196 static void tegra20_i2s_stop_playback(struct tegra20_i2s *i2s)
 197 {
 198         regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
 199                            TEGRA20_I2S_CTRL_FIFO1_ENABLE, 0);
 200 }
 201
 202 static void tegra20_i2s_start_capture(struct tegra20_i2s *i2s)
 203 {
 204         regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
 205                            TEGRA20_I2S_CTRL_FIFO2_ENABLE,
 206                            TEGRA20_I2S_CTRL_FIFO2_ENABLE);
 207 }
 208
 209 static void tegra20_i2s_stop_capture(struct tegra20_i2s *i2s)
 210 {
 211         regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
 212                            TEGRA20_I2S_CTRL_FIFO2_ENABLE, 0);
 213 }
 214
 215 static int tegra20_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 216                                struct snd_soc_dai *dai)
 217 {
 218         struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 219
 220         switch (cmd) {
 221         case SNDRV_PCM_TRIGGER_START:
 222         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 223         case SNDRV_PCM_TRIGGER_RESUME:
 224                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 225                         tegra20_i2s_start_playback(i2s);
 226                 else
 227                         tegra20_i2s_start_capture(i2s);
 228                 break;
 229         case SNDRV_PCM_TRIGGER_STOP:
 230         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 231         case SNDRV_PCM_TRIGGER_SUSPEND:
 232                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 233                         tegra20_i2s_stop_playback(i2s);
 234                 else
 235                         tegra20_i2s_stop_capture(i2s);
 236                 break;
 237         default:
 238                 return -EINVAL;
 239         }
 240
 241         return 0;
 242 }
 243
 244 static int tegra20_i2s_probe(struct snd_soc_dai *dai)
 245 {
 246         struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 247
 248         dai->capture_dma_data = &i2s->capture_dma_data;
 249         dai->playback_dma_data = &i2s->playback_dma_data;
 250
 251         return 0;
 252 }
 253
 254 static const struct snd_soc_dai_ops tegra20_i2s_dai_ops = {
 255         .set_fmt        = tegra20_i2s_set_fmt,
 256         .hw_params      = tegra20_i2s_hw_params,
 257         .trigger        = tegra20_i2s_trigger,
 258 };
 259
 260 static const struct snd_soc_dai_driver tegra20_i2s_dai_template = {
 261         .probe = tegra20_i2s_probe,
 262         .playback = {
 263                 .stream_name = "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                 .stream_name = "Capture",
 271                 .channels_min = 2,
 272                 .channels_max = 2,
 273                 .rates = SNDRV_PCM_RATE_8000_96000,
 274                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 275         },
 276         .ops = &tegra20_i2s_dai_ops,
 277         .symmetric_rates = 1,
 278 };
 279
 280 static const struct snd_soc_component_driver tegra20_i2s_component = {
 281         .name           = DRV_NAME,
 282 };
 283
 284 static bool tegra20_i2s_wr_rd_reg(struct device *dev, unsigned int reg)
 285 {
 286         switch (reg) {
 287         case TEGRA20_I2S_CTRL:
 288         case TEGRA20_I2S_STATUS:
 289         case TEGRA20_I2S_TIMING:
 290         case TEGRA20_I2S_FIFO_SCR:
 291         case TEGRA20_I2S_PCM_CTRL:
 292         case TEGRA20_I2S_NW_CTRL:
 293         case TEGRA20_I2S_TDM_CTRL:
 294         case TEGRA20_I2S_TDM_TX_RX_CTRL:
 295         case TEGRA20_I2S_FIFO1:
 296         case TEGRA20_I2S_FIFO2:
 297                 return true;
 298         default:
 299                 return false;
 300         }
 301 }
 302
 303 static bool tegra20_i2s_volatile_reg(struct device *dev, unsigned int reg)
 304 {
 305         switch (reg) {
 306         case TEGRA20_I2S_STATUS:
 307         case TEGRA20_I2S_FIFO_SCR:
 308         case TEGRA20_I2S_FIFO1:
 309         case TEGRA20_I2S_FIFO2:
 310                 return true;
 311         default:
 312                 return false;
 313         }
 314 }
 315
 316 static bool tegra20_i2s_precious_reg(struct device *dev, unsigned int reg)
 317 {
 318         switch (reg) {
 319         case TEGRA20_I2S_FIFO1:
 320         case TEGRA20_I2S_FIFO2:
 321                 return true;
 322         default:
 323                 return false;
 324         }
 325 }
 326
 327 static const struct regmap_config tegra20_i2s_regmap_config = {
 328         .reg_bits = 32,
 329         .reg_stride = 4,
 330         .val_bits = 32,
 331         .max_register = TEGRA20_I2S_FIFO2,
 332         .writeable_reg = tegra20_i2s_wr_rd_reg,
 333         .readable_reg = tegra20_i2s_wr_rd_reg,
 334         .volatile_reg = tegra20_i2s_volatile_reg,
 335         .precious_reg = tegra20_i2s_precious_reg,
 336         .cache_type = REGCACHE_FLAT,
 337 };
 338
 339 static int tegra20_i2s_platform_probe(struct platform_device *pdev)
 340 {
 341         struct tegra20_i2s *i2s;
 342         struct resource *mem, *memregion;
 343         void __iomem *regs;
 344         int ret;
 345
 346         i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_i2s), GFP_KERNEL);
 347         if (!i2s) {
 348                 dev_err(&pdev->dev, "Can't allocate tegra20_i2s\n");
 349                 ret = -ENOMEM;
 350                 goto err;
 351         }
 352         dev_set_drvdata(&pdev->dev, i2s);
 353
 354         i2s->dai = tegra20_i2s_dai_template;
 355         i2s->dai.name = dev_name(&pdev->dev);
 356
 357         i2s->clk_i2s = clk_get(&pdev->dev, NULL);
 358         if (IS_ERR(i2s->clk_i2s)) {
 359                 dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
 360                 ret = PTR_ERR(i2s->clk_i2s);
 361                 goto err;
 362         }
 363
 364         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 365         if (!mem) {
 366                 dev_err(&pdev->dev, "No memory resource\n");
 367                 ret = -ENODEV;
 368                 goto err_clk_put;
 369         }
 370
 371         memregion = devm_request_mem_region(&pdev->dev, mem->start,
 372                                             resource_size(mem), DRV_NAME);
 373         if (!memregion) {
 374                 dev_err(&pdev->dev, "Memory region already claimed\n");
 375                 ret = -EBUSY;
 376                 goto err_clk_put;
 377         }
 378
 379         regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
 380         if (!regs) {
 381                 dev_err(&pdev->dev, "ioremap failed\n");
 382                 ret = -ENOMEM;
 383                 goto err_clk_put;
 384         }
 385
 386         i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
 387                                             &tegra20_i2s_regmap_config);
 388         if (IS_ERR(i2s->regmap)) {
 389                 dev_err(&pdev->dev, "regmap init failed\n");
 390                 ret = PTR_ERR(i2s->regmap);
 391                 goto err_clk_put;
 392         }
 393
 394         i2s->capture_dma_data.addr = mem->start + TEGRA20_I2S_FIFO2;
 395         i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 396         i2s->capture_dma_data.maxburst = 4;
 397
 398         i2s->playback_dma_data.addr = mem->start + TEGRA20_I2S_FIFO1;
 399         i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 400         i2s->playback_dma_data.maxburst = 4;
 401
 402         pm_runtime_enable(&pdev->dev);
 403         if (!pm_runtime_enabled(&pdev->dev)) {
 404                 ret = tegra20_i2s_runtime_resume(&pdev->dev);
 405                 if (ret)
 406                         goto err_pm_disable;
 407         }
 408
 409         ret = snd_soc_register_component(&pdev->dev, &tegra20_i2s_component,
 410                                          &i2s->dai, 1);
 411         if (ret) {
 412                 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
 413                 ret = -ENOMEM;
 414                 goto err_suspend;
 415         }
 416
 417         ret = tegra_pcm_platform_register(&pdev->dev);
 418         if (ret) {
 419                 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
 420                 goto err_unregister_component;
 421         }
 422
 423         return 0;
 424
 425 err_unregister_component:
 426         snd_soc_unregister_component(&pdev->dev);
 427 err_suspend:
 428         if (!pm_runtime_status_suspended(&pdev->dev))
 429                 tegra20_i2s_runtime_suspend(&pdev->dev);
 430 err_pm_disable:
 431         pm_runtime_disable(&pdev->dev);
 432 err_clk_put:
 433         clk_put(i2s->clk_i2s);
 434 err:
 435         return ret;
 436 }
 437
 438 static int tegra20_i2s_platform_remove(struct platform_device *pdev)
 439 {
 440         struct tegra20_i2s *i2s = dev_get_drvdata(&pdev->dev);
 441
 442         pm_runtime_disable(&pdev->dev);
 443         if (!pm_runtime_status_suspended(&pdev->dev))
 444                 tegra20_i2s_runtime_suspend(&pdev->dev);
 445
 446         tegra_pcm_platform_unregister(&pdev->dev);
 447         snd_soc_unregister_component(&pdev->dev);
 448
 449         clk_put(i2s->clk_i2s);
 450
 451         return 0;
 452 }
 453
 454 static const struct of_device_id tegra20_i2s_of_match[] = {
 455         { .compatible = "nvidia,tegra20-i2s", },
 456         {},
 457 };
 458
 459 static const struct dev_pm_ops tegra20_i2s_pm_ops = {
 460         SET_RUNTIME_PM_OPS(tegra20_i2s_runtime_suspend,
 461                            tegra20_i2s_runtime_resume, NULL)
 462 };
 463
 464 static struct platform_driver tegra20_i2s_driver = {
 465         .driver = {
 466                 .name = DRV_NAME,
 467                 .of_match_table = tegra20_i2s_of_match,
 468                 .pm = &tegra20_i2s_pm_ops,
 469         },
 470         .probe = tegra20_i2s_platform_probe,
 471         .remove = tegra20_i2s_platform_remove,
 472 };
 473 module_platform_driver(tegra20_i2s_driver);
 474
 475 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 476 MODULE_DESCRIPTION("Tegra20 I2S ASoC driver");
 477 MODULE_LICENSE("GPL");
 478 MODULE_ALIAS("platform:" DRV_NAME);
 479 MODULE_DEVICE_TABLE(of, tegra20_i2s_of_match);