sound/soc/tegra/tegra_i2s.c

   1 /*
   2  * tegra_i2s.c - Tegra I2S driver
   3  *
   4  * Author: Stephen Warren <swarren@nvidia.com>
   5  * Copyright (C) 2010 - 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/module.h>
  33 #include <linux/debugfs.h>
  34 #include <linux/device.h>
  35 #include <linux/platform_device.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/slab.h>
  38 #include <linux/io.h>
  39 #include <mach/iomap.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 "tegra_das.h"
  46 #include "tegra_i2s.h"
  47
  48 #define DRV_NAME "tegra-i2s"
  49
  50 static inline void tegra_i2s_write(struct tegra_i2s *i2s, u32 reg, u32 val)
  51 {
  52         __raw_writel(val, i2s->regs + reg);
  53 }
  54
  55 static inline u32 tegra_i2s_read(struct tegra_i2s *i2s, u32 reg)
  56 {
  57         return __raw_readl(i2s->regs + reg);
  58 }
  59
  60 #ifdef CONFIG_DEBUG_FS
  61 static int tegra_i2s_show(struct seq_file *s, void *unused)
  62 {
  63 #define REG(r) { r, #r }
  64         static const struct {
  65                 int offset;
  66                 const char *name;
  67         } regs[] = {
  68                 REG(TEGRA_I2S_CTRL),
  69                 REG(TEGRA_I2S_STATUS),
  70                 REG(TEGRA_I2S_TIMING),
  71                 REG(TEGRA_I2S_FIFO_SCR),
  72                 REG(TEGRA_I2S_PCM_CTRL),
  73                 REG(TEGRA_I2S_NW_CTRL),
  74                 REG(TEGRA_I2S_TDM_CTRL),
  75                 REG(TEGRA_I2S_TDM_TX_RX_CTRL),
  76         };
  77 #undef REG
  78
  79         struct tegra_i2s *i2s = s->private;
  80         int i;
  81
  82         for (i = 0; i < ARRAY_SIZE(regs); i++) {
  83                 u32 val = tegra_i2s_read(i2s, regs[i].offset);
  84                 seq_printf(s, "%s = %08x\n", regs[i].name, val);
  85         }
  86
  87         return 0;
  88 }
  89
  90 static int tegra_i2s_debug_open(struct inode *inode, struct file *file)
  91 {
  92         return single_open(file, tegra_i2s_show, inode->i_private);
  93 }
  94
  95 static const struct file_operations tegra_i2s_debug_fops = {
  96         .open    = tegra_i2s_debug_open,
  97         .read    = seq_read,
  98         .llseek  = seq_lseek,
  99         .release = single_release,
 100 };
 101
 102 static void tegra_i2s_debug_add(struct tegra_i2s *i2s, int id)
 103 {
 104         char name[] = DRV_NAME ".0";
 105
 106         snprintf(name, sizeof(name), DRV_NAME".%1d", id);
 107         i2s->debug = debugfs_create_file(name, S_IRUGO, snd_soc_debugfs_root,
 108                                                 i2s, &tegra_i2s_debug_fops);
 109 }
 110
 111 static void tegra_i2s_debug_remove(struct tegra_i2s *i2s)
 112 {
 113         if (i2s->debug)
 114                 debugfs_remove(i2s->debug);
 115 }
 116 #else
 117 static inline void tegra_i2s_debug_add(struct tegra_i2s *i2s)
 118 {
 119 }
 120
 121 static inline void tegra_i2s_debug_remove(struct tegra_i2s *i2s)
 122 {
 123 }
 124 #endif
 125
 126 static int tegra_i2s_set_fmt(struct snd_soc_dai *dai,
 127                                 unsigned int fmt)
 128 {
 129         struct tegra_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 130
 131         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 132         case SND_SOC_DAIFMT_NB_NF:
 133                 break;
 134         default:
 135                 return -EINVAL;
 136         }
 137
 138         i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_MASTER_ENABLE;
 139         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 140         case SND_SOC_DAIFMT_CBS_CFS:
 141                 i2s->reg_ctrl |= TEGRA_I2S_CTRL_MASTER_ENABLE;
 142                 break;
 143         case SND_SOC_DAIFMT_CBM_CFM:
 144                 break;
 145         default:
 146                 return -EINVAL;
 147         }
 148
 149         i2s->reg_ctrl &= ~(TEGRA_I2S_CTRL_BIT_FORMAT_MASK |
 150                                 TEGRA_I2S_CTRL_LRCK_MASK);
 151         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 152         case SND_SOC_DAIFMT_DSP_A:
 153                 i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_DSP;
 154                 i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
 155                 break;
 156         case SND_SOC_DAIFMT_DSP_B:
 157                 i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_DSP;
 158                 i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_R_LOW;
 159                 break;
 160         case SND_SOC_DAIFMT_I2S:
 161                 i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_I2S;
 162                 i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
 163                 break;
 164         case SND_SOC_DAIFMT_RIGHT_J:
 165                 i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_RJM;
 166                 i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
 167                 break;
 168         case SND_SOC_DAIFMT_LEFT_J:
 169                 i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_FORMAT_LJM;
 170                 i2s->reg_ctrl |= TEGRA_I2S_CTRL_LRCK_L_LOW;
 171                 break;
 172         default:
 173                 return -EINVAL;
 174         }
 175
 176         return 0;
 177 }
 178
 179 static int tegra_i2s_hw_params(struct snd_pcm_substream *substream,
 180                                 struct snd_pcm_hw_params *params,
 181                                 struct snd_soc_dai *dai)
 182 {
 183         struct device *dev = substream->pcm->card->dev;
 184         struct tegra_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 185         u32 reg;
 186         int ret, sample_size, srate, i2sclock, bitcnt;
 187
 188         i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_BIT_SIZE_MASK;
 189         switch (params_format(params)) {
 190         case SNDRV_PCM_FORMAT_S16_LE:
 191                 i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_SIZE_16;
 192                 sample_size = 16;
 193                 break;
 194         case SNDRV_PCM_FORMAT_S24_LE:
 195                 i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_SIZE_24;
 196                 sample_size = 24;
 197                 break;
 198         case SNDRV_PCM_FORMAT_S32_LE:
 199                 i2s->reg_ctrl |= TEGRA_I2S_CTRL_BIT_SIZE_32;
 200                 sample_size = 32;
 201                 break;
 202         default:
 203                 return -EINVAL;
 204         }
 205
 206         srate = params_rate(params);
 207
 208         /* Final "* 2" required by Tegra hardware */
 209         i2sclock = srate * params_channels(params) * sample_size * 2;
 210
 211         ret = clk_set_rate(i2s->clk_i2s, i2sclock);
 212         if (ret) {
 213                 dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
 214                 return ret;
 215         }
 216
 217         bitcnt = (i2sclock / (2 * srate)) - 1;
 218         if (bitcnt < 0 || bitcnt > TEGRA_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
 219                 return -EINVAL;
 220         reg = bitcnt << TEGRA_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
 221
 222         if (i2sclock % (2 * srate))
 223                 reg |= TEGRA_I2S_TIMING_NON_SYM_ENABLE;
 224
 225         tegra_i2s_write(i2s, TEGRA_I2S_TIMING, reg);
 226
 227         tegra_i2s_write(i2s, TEGRA_I2S_FIFO_SCR,
 228                 TEGRA_I2S_FIFO_SCR_FIFO2_ATN_LVL_FOUR_SLOTS |
 229                 TEGRA_I2S_FIFO_SCR_FIFO1_ATN_LVL_FOUR_SLOTS);
 230
 231         return 0;
 232 }
 233
 234 static void tegra_i2s_start_playback(struct tegra_i2s *i2s)
 235 {
 236         i2s->reg_ctrl |= TEGRA_I2S_CTRL_FIFO1_ENABLE;
 237         tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
 238 }
 239
 240 static void tegra_i2s_stop_playback(struct tegra_i2s *i2s)
 241 {
 242         i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_FIFO1_ENABLE;
 243         tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
 244 }
 245
 246 static void tegra_i2s_start_capture(struct tegra_i2s *i2s)
 247 {
 248         i2s->reg_ctrl |= TEGRA_I2S_CTRL_FIFO2_ENABLE;
 249         tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
 250 }
 251
 252 static void tegra_i2s_stop_capture(struct tegra_i2s *i2s)
 253 {
 254         i2s->reg_ctrl &= ~TEGRA_I2S_CTRL_FIFO2_ENABLE;
 255         tegra_i2s_write(i2s, TEGRA_I2S_CTRL, i2s->reg_ctrl);
 256 }
 257
 258 static int tegra_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 259                                 struct snd_soc_dai *dai)
 260 {
 261         struct tegra_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 262
 263         switch (cmd) {
 264         case SNDRV_PCM_TRIGGER_START:
 265         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 266         case SNDRV_PCM_TRIGGER_RESUME:
 267                 if (!i2s->clk_refs)
 268                         clk_enable(i2s->clk_i2s);
 269                 i2s->clk_refs++;
 270                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 271                         tegra_i2s_start_playback(i2s);
 272                 else
 273                         tegra_i2s_start_capture(i2s);
 274                 break;
 275         case SNDRV_PCM_TRIGGER_STOP:
 276         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 277         case SNDRV_PCM_TRIGGER_SUSPEND:
 278                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 279                         tegra_i2s_stop_playback(i2s);
 280                 else
 281                         tegra_i2s_stop_capture(i2s);
 282                 i2s->clk_refs--;
 283                 if (!i2s->clk_refs)
 284                         clk_disable(i2s->clk_i2s);
 285                 break;
 286         default:
 287                 return -EINVAL;
 288         }
 289
 290         return 0;
 291 }
 292
 293 static int tegra_i2s_probe(struct snd_soc_dai *dai)
 294 {
 295         struct tegra_i2s * i2s = snd_soc_dai_get_drvdata(dai);
 296
 297         dai->capture_dma_data = &i2s->capture_dma_data;
 298         dai->playback_dma_data = &i2s->playback_dma_data;
 299
 300         return 0;
 301 }
 302
 303 static struct snd_soc_dai_ops tegra_i2s_dai_ops = {
 304         .set_fmt        = tegra_i2s_set_fmt,
 305         .hw_params      = tegra_i2s_hw_params,
 306         .trigger        = tegra_i2s_trigger,
 307 };
 308
 309 struct snd_soc_dai_driver tegra_i2s_dai[] = {
 310         {
 311                 .name = DRV_NAME ".0",
 312                 .probe = tegra_i2s_probe,
 313                 .playback = {
 314                         .channels_min = 2,
 315                         .channels_max = 2,
 316                         .rates = SNDRV_PCM_RATE_8000_96000,
 317                         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 318                 },
 319                 .capture = {
 320                         .channels_min = 2,
 321                         .channels_max = 2,
 322                         .rates = SNDRV_PCM_RATE_8000_96000,
 323                         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 324                 },
 325                 .ops = &tegra_i2s_dai_ops,
 326                 .symmetric_rates = 1,
 327         },
 328         {
 329                 .name = DRV_NAME ".1",
 330                 .probe = tegra_i2s_probe,
 331                 .playback = {
 332                         .channels_min = 2,
 333                         .channels_max = 2,
 334                         .rates = SNDRV_PCM_RATE_8000_96000,
 335                         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 336                 },
 337                 .capture = {
 338                         .channels_min = 2,
 339                         .channels_max = 2,
 340                         .rates = SNDRV_PCM_RATE_8000_96000,
 341                         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 342                 },
 343                 .ops = &tegra_i2s_dai_ops,
 344                 .symmetric_rates = 1,
 345         },
 346 };
 347
 348 static __devinit int tegra_i2s_platform_probe(struct platform_device *pdev)
 349 {
 350         struct tegra_i2s * i2s;
 351         char clk_name[12]; /* tegra-i2s.0 */
 352         struct resource *mem, *memregion, *dmareq;
 353         int ret;
 354
 355         if ((pdev->id < 0) ||
 356                 (pdev->id >= ARRAY_SIZE(tegra_i2s_dai))) {
 357                 dev_err(&pdev->dev, "ID %d out of range\n", pdev->id);
 358                 return -EINVAL;
 359         }
 360
 361         /*
 362          * FIXME: Until a codec driver exists for the tegra DAS, hard-code a
 363          * 1:1 mapping between audio controllers and audio ports.
 364          */
 365         ret = tegra_das_connect_dap_to_dac(TEGRA_DAS_DAP_ID_1 + pdev->id,
 366                                         TEGRA_DAS_DAP_SEL_DAC1 + pdev->id);
 367         if (ret) {
 368                 dev_err(&pdev->dev, "Can't set up DAP connection\n");
 369                 return ret;
 370         }
 371         ret = tegra_das_connect_dac_to_dap(TEGRA_DAS_DAC_ID_1 + pdev->id,
 372                                         TEGRA_DAS_DAC_SEL_DAP1 + pdev->id);
 373         if (ret) {
 374                 dev_err(&pdev->dev, "Can't set up DAC connection\n");
 375                 return ret;
 376         }
 377
 378         i2s = kzalloc(sizeof(struct tegra_i2s), GFP_KERNEL);
 379         if (!i2s) {
 380                 dev_err(&pdev->dev, "Can't allocate tegra_i2s\n");
 381                 ret = -ENOMEM;
 382                 goto exit;
 383         }
 384         dev_set_drvdata(&pdev->dev, i2s);
 385
 386         snprintf(clk_name, sizeof(clk_name), DRV_NAME ".%d", pdev->id);
 387         i2s->clk_i2s = clk_get_sys(clk_name, NULL);
 388         if (IS_ERR(i2s->clk_i2s)) {
 389                 dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
 390                 ret = PTR_ERR(i2s->clk_i2s);
 391                 goto err_free;
 392         }
 393
 394         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 395         if (!mem) {
 396                 dev_err(&pdev->dev, "No memory resource\n");
 397                 ret = -ENODEV;
 398                 goto err_clk_put;
 399         }
 400
 401         dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 402         if (!dmareq) {
 403                 dev_err(&pdev->dev, "No DMA resource\n");
 404                 ret = -ENODEV;
 405                 goto err_clk_put;
 406         }
 407
 408         memregion = request_mem_region(mem->start, resource_size(mem),
 409                                         DRV_NAME);
 410         if (!memregion) {
 411                 dev_err(&pdev->dev, "Memory region already claimed\n");
 412                 ret = -EBUSY;
 413                 goto err_clk_put;
 414         }
 415
 416         i2s->regs = ioremap(mem->start, resource_size(mem));
 417         if (!i2s->regs) {
 418                 dev_err(&pdev->dev, "ioremap failed\n");
 419                 ret = -ENOMEM;
 420                 goto err_release;
 421         }
 422
 423         i2s->capture_dma_data.addr = mem->start + TEGRA_I2S_FIFO2;
 424         i2s->capture_dma_data.wrap = 4;
 425         i2s->capture_dma_data.width = 32;
 426         i2s->capture_dma_data.req_sel = dmareq->start;
 427
 428         i2s->playback_dma_data.addr = mem->start + TEGRA_I2S_FIFO1;
 429         i2s->playback_dma_data.wrap = 4;
 430         i2s->playback_dma_data.width = 32;
 431         i2s->playback_dma_data.req_sel = dmareq->start;
 432
 433         i2s->reg_ctrl = TEGRA_I2S_CTRL_FIFO_FORMAT_PACKED;
 434
 435         ret = snd_soc_register_dai(&pdev->dev, &tegra_i2s_dai[pdev->id]);
 436         if (ret) {
 437                 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
 438                 ret = -ENOMEM;
 439                 goto err_unmap;
 440         }
 441
 442         tegra_i2s_debug_add(i2s, pdev->id);
 443
 444         return 0;
 445
 446 err_unmap:
 447         iounmap(i2s->regs);
 448 err_release:
 449         release_mem_region(mem->start, resource_size(mem));
 450 err_clk_put:
 451         clk_put(i2s->clk_i2s);
 452 err_free:
 453         kfree(i2s);
 454 exit:
 455         return ret;
 456 }
 457
 458 static int __devexit tegra_i2s_platform_remove(struct platform_device *pdev)
 459 {
 460         struct tegra_i2s *i2s = dev_get_drvdata(&pdev->dev);
 461         struct resource *res;
 462
 463         snd_soc_unregister_dai(&pdev->dev);
 464
 465         tegra_i2s_debug_remove(i2s);
 466
 467         iounmap(i2s->regs);
 468
 469         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 470         release_mem_region(res->start, resource_size(res));
 471
 472         clk_put(i2s->clk_i2s);
 473
 474         kfree(i2s);
 475
 476         return 0;
 477 }
 478
 479 static struct platform_driver tegra_i2s_driver = {
 480         .driver = {
 481                 .name = DRV_NAME,
 482                 .owner = THIS_MODULE,
 483         },
 484         .probe = tegra_i2s_platform_probe,
 485         .remove = __devexit_p(tegra_i2s_platform_remove),
 486 };
 487
 488 static int __init snd_tegra_i2s_init(void)
 489 {
 490         return platform_driver_register(&tegra_i2s_driver);
 491 }
 492 module_init(snd_tegra_i2s_init);
 493
 494 static void __exit snd_tegra_i2s_exit(void)
 495 {
 496         platform_driver_unregister(&tegra_i2s_driver);
 497 }
 498 module_exit(snd_tegra_i2s_exit);
 499
 500 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 501 MODULE_DESCRIPTION("Tegra I2S ASoC driver");
 502 MODULE_LICENSE("GPL");
 503 MODULE_ALIAS("platform:" DRV_NAME);