sound/soc/jz4740/jz4740-i2s.c

   1 /*
   2  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
   3  *
   4  *  This program is free software; you can redistribute it and/or modify it
   5  *  under  the terms of the GNU General  Public License as published by the
   6  *  Free Software Foundation;  either version 2 of the License, or (at your
   7  *  option) any later version.
   8  *
   9  *  You should have received a copy of the GNU General Public License along
  10  *  with this program; if not, write to the Free Software Foundation, Inc.,
  11  *  675 Mass Ave, Cambridge, MA 02139, USA.
  12  *
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/io.h>
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/slab.h>
  21
  22 #include <linux/clk.h>
  23 #include <linux/delay.h>
  24
  25 #include <linux/dma-mapping.h>
  26
  27 #include <sound/core.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/soc.h>
  31 #include <sound/initval.h>
  32
  33 #include "jz4740-i2s.h"
  34 #include "jz4740-pcm.h"
  35
  36 #define JZ_REG_AIC_CONF         0x00
  37 #define JZ_REG_AIC_CTRL         0x04
  38 #define JZ_REG_AIC_I2S_FMT      0x10
  39 #define JZ_REG_AIC_FIFO_STATUS  0x14
  40 #define JZ_REG_AIC_I2S_STATUS   0x1c
  41 #define JZ_REG_AIC_CLK_DIV      0x30
  42 #define JZ_REG_AIC_FIFO         0x34
  43
  44 #define JZ_AIC_CONF_FIFO_RX_THRESHOLD_MASK (0xf << 12)
  45 #define JZ_AIC_CONF_FIFO_TX_THRESHOLD_MASK (0xf <<  8)
  46 #define JZ_AIC_CONF_OVERFLOW_PLAY_LAST BIT(6)
  47 #define JZ_AIC_CONF_INTERNAL_CODEC BIT(5)
  48 #define JZ_AIC_CONF_I2S BIT(4)
  49 #define JZ_AIC_CONF_RESET BIT(3)
  50 #define JZ_AIC_CONF_BIT_CLK_MASTER BIT(2)
  51 #define JZ_AIC_CONF_SYNC_CLK_MASTER BIT(1)
  52 #define JZ_AIC_CONF_ENABLE BIT(0)
  53
  54 #define JZ_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET 12
  55 #define JZ_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET 8
  56
  57 #define JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_MASK (0x7 << 19)
  58 #define JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_MASK (0x7 << 16)
  59 #define JZ_AIC_CTRL_ENABLE_RX_DMA BIT(15)
  60 #define JZ_AIC_CTRL_ENABLE_TX_DMA BIT(14)
  61 #define JZ_AIC_CTRL_MONO_TO_STEREO BIT(11)
  62 #define JZ_AIC_CTRL_SWITCH_ENDIANNESS BIT(10)
  63 #define JZ_AIC_CTRL_SIGNED_TO_UNSIGNED BIT(9)
  64 #define JZ_AIC_CTRL_FLUSH               BIT(8)
  65 #define JZ_AIC_CTRL_ENABLE_ROR_INT BIT(6)
  66 #define JZ_AIC_CTRL_ENABLE_TUR_INT BIT(5)
  67 #define JZ_AIC_CTRL_ENABLE_RFS_INT BIT(4)
  68 #define JZ_AIC_CTRL_ENABLE_TFS_INT BIT(3)
  69 #define JZ_AIC_CTRL_ENABLE_LOOPBACK BIT(2)
  70 #define JZ_AIC_CTRL_ENABLE_PLAYBACK BIT(1)
  71 #define JZ_AIC_CTRL_ENABLE_CAPTURE BIT(0)
  72
  73 #define JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_OFFSET 19
  74 #define JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_OFFSET  16
  75
  76 #define JZ_AIC_I2S_FMT_DISABLE_BIT_CLK BIT(12)
  77 #define JZ_AIC_I2S_FMT_ENABLE_SYS_CLK BIT(4)
  78 #define JZ_AIC_I2S_FMT_MSB BIT(0)
  79
  80 #define JZ_AIC_I2S_STATUS_BUSY BIT(2)
  81
  82 #define JZ_AIC_CLK_DIV_MASK 0xf
  83
  84 struct jz4740_i2s {
  85         struct resource *mem;
  86         void __iomem *base;
  87         dma_addr_t phys_base;
  88
  89         struct clk *clk_aic;
  90         struct clk *clk_i2s;
  91
  92         struct jz4740_pcm_config pcm_config_playback;
  93         struct jz4740_pcm_config pcm_config_capture;
  94 };
  95
  96 static inline uint32_t jz4740_i2s_read(const struct jz4740_i2s *i2s,
  97         unsigned int reg)
  98 {
  99         return readl(i2s->base + reg);
 100 }
 101
 102 static inline void jz4740_i2s_write(const struct jz4740_i2s *i2s,
 103         unsigned int reg, uint32_t value)
 104 {
 105         writel(value, i2s->base + reg);
 106 }
 107
 108 static int jz4740_i2s_startup(struct snd_pcm_substream *substream,
 109         struct snd_soc_dai *dai)
 110 {
 111         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 112         uint32_t conf, ctrl;
 113
 114         if (dai->active)
 115                 return 0;
 116
 117         ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);
 118         ctrl |= JZ_AIC_CTRL_FLUSH;
 119         jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);
 120
 121         clk_prepare_enable(i2s->clk_i2s);
 122
 123         conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
 124         conf |= JZ_AIC_CONF_ENABLE;
 125         jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
 126
 127         return 0;
 128 }
 129
 130 static void jz4740_i2s_shutdown(struct snd_pcm_substream *substream,
 131         struct snd_soc_dai *dai)
 132 {
 133         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 134         uint32_t conf;
 135
 136         if (dai->active)
 137                 return;
 138
 139         conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
 140         conf &= ~JZ_AIC_CONF_ENABLE;
 141         jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
 142
 143         clk_disable_unprepare(i2s->clk_i2s);
 144 }
 145
 146 static int jz4740_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 147         struct snd_soc_dai *dai)
 148 {
 149         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 150
 151         uint32_t ctrl;
 152         uint32_t mask;
 153
 154         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 155                 mask = JZ_AIC_CTRL_ENABLE_PLAYBACK | JZ_AIC_CTRL_ENABLE_TX_DMA;
 156         else
 157                 mask = JZ_AIC_CTRL_ENABLE_CAPTURE | JZ_AIC_CTRL_ENABLE_RX_DMA;
 158
 159         ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);
 160
 161         switch (cmd) {
 162         case SNDRV_PCM_TRIGGER_START:
 163         case SNDRV_PCM_TRIGGER_RESUME:
 164         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 165                 ctrl |= mask;
 166                 break;
 167         case SNDRV_PCM_TRIGGER_STOP:
 168         case SNDRV_PCM_TRIGGER_SUSPEND:
 169         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 170                 ctrl &= ~mask;
 171                 break;
 172         default:
 173                 return -EINVAL;
 174         }
 175
 176         jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);
 177
 178         return 0;
 179 }
 180
 181 static int jz4740_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 182 {
 183         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 184
 185         uint32_t format = 0;
 186         uint32_t conf;
 187
 188         conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
 189
 190         conf &= ~(JZ_AIC_CONF_BIT_CLK_MASTER | JZ_AIC_CONF_SYNC_CLK_MASTER);
 191
 192         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 193         case SND_SOC_DAIFMT_CBS_CFS:
 194                 conf |= JZ_AIC_CONF_BIT_CLK_MASTER | JZ_AIC_CONF_SYNC_CLK_MASTER;
 195                 format |= JZ_AIC_I2S_FMT_ENABLE_SYS_CLK;
 196                 break;
 197         case SND_SOC_DAIFMT_CBM_CFS:
 198                 conf |= JZ_AIC_CONF_SYNC_CLK_MASTER;
 199                 break;
 200         case SND_SOC_DAIFMT_CBS_CFM:
 201                 conf |= JZ_AIC_CONF_BIT_CLK_MASTER;
 202                 break;
 203         case SND_SOC_DAIFMT_CBM_CFM:
 204                 break;
 205         default:
 206                 return -EINVAL;
 207         }
 208
 209         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 210         case SND_SOC_DAIFMT_MSB:
 211                 format |= JZ_AIC_I2S_FMT_MSB;
 212                 break;
 213         case SND_SOC_DAIFMT_I2S:
 214                 break;
 215         default:
 216                 return -EINVAL;
 217         }
 218
 219         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 220         case SND_SOC_DAIFMT_NB_NF:
 221                 break;
 222         default:
 223                 return -EINVAL;
 224         }
 225
 226         jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
 227         jz4740_i2s_write(i2s, JZ_REG_AIC_I2S_FMT, format);
 228
 229         return 0;
 230 }
 231
 232 static int jz4740_i2s_hw_params(struct snd_pcm_substream *substream,
 233         struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 234 {
 235         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 236         enum jz4740_dma_width dma_width;
 237         struct jz4740_pcm_config *pcm_config;
 238         unsigned int sample_size;
 239         uint32_t ctrl;
 240
 241         ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);
 242
 243         switch (params_format(params)) {
 244         case SNDRV_PCM_FORMAT_S8:
 245                 sample_size = 0;
 246                 dma_width = JZ4740_DMA_WIDTH_8BIT;
 247                 break;
 248         case SNDRV_PCM_FORMAT_S16:
 249                 sample_size = 1;
 250                 dma_width = JZ4740_DMA_WIDTH_16BIT;
 251                 break;
 252         default:
 253                 return -EINVAL;
 254         }
 255
 256         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 257                 ctrl &= ~JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_MASK;
 258                 ctrl |= sample_size << JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_OFFSET;
 259                 if (params_channels(params) == 1)
 260                         ctrl |= JZ_AIC_CTRL_MONO_TO_STEREO;
 261                 else
 262                         ctrl &= ~JZ_AIC_CTRL_MONO_TO_STEREO;
 263
 264                 pcm_config = &i2s->pcm_config_playback;
 265                 pcm_config->dma_config.dst_width = dma_width;
 266
 267         } else {
 268                 ctrl &= ~JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_MASK;
 269                 ctrl |= sample_size << JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_OFFSET;
 270
 271                 pcm_config = &i2s->pcm_config_capture;
 272                 pcm_config->dma_config.src_width = dma_width;
 273         }
 274
 275         jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);
 276
 277         snd_soc_dai_set_dma_data(dai, substream, pcm_config);
 278
 279         return 0;
 280 }
 281
 282 static int jz4740_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
 283         unsigned int freq, int dir)
 284 {
 285         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 286         struct clk *parent;
 287         int ret = 0;
 288
 289         switch (clk_id) {
 290         case JZ4740_I2S_CLKSRC_EXT:
 291                 parent = clk_get(NULL, "ext");
 292                 clk_set_parent(i2s->clk_i2s, parent);
 293                 break;
 294         case JZ4740_I2S_CLKSRC_PLL:
 295                 parent = clk_get(NULL, "pll half");
 296                 clk_set_parent(i2s->clk_i2s, parent);
 297                 ret = clk_set_rate(i2s->clk_i2s, freq);
 298                 break;
 299         default:
 300                 return -EINVAL;
 301         }
 302         clk_put(parent);
 303
 304         return ret;
 305 }
 306
 307 static int jz4740_i2s_suspend(struct snd_soc_dai *dai)
 308 {
 309         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 310         uint32_t conf;
 311
 312         if (dai->active) {
 313                 conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
 314                 conf &= ~JZ_AIC_CONF_ENABLE;
 315                 jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
 316
 317                 clk_disable_unprepare(i2s->clk_i2s);
 318         }
 319
 320         clk_disable_unprepare(i2s->clk_aic);
 321
 322         return 0;
 323 }
 324
 325 static int jz4740_i2s_resume(struct snd_soc_dai *dai)
 326 {
 327         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 328         uint32_t conf;
 329
 330         clk_prepare_enable(i2s->clk_aic);
 331
 332         if (dai->active) {
 333                 clk_prepare_enable(i2s->clk_i2s);
 334
 335                 conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
 336                 conf |= JZ_AIC_CONF_ENABLE;
 337                 jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
 338         }
 339
 340         return 0;
 341 }
 342
 343 static void jz4740_i2c_init_pcm_config(struct jz4740_i2s *i2s)
 344 {
 345         struct jz4740_dma_config *dma_config;
 346
 347         /* Playback */
 348         dma_config = &i2s->pcm_config_playback.dma_config;
 349         dma_config->src_width = JZ4740_DMA_WIDTH_32BIT;
 350         dma_config->transfer_size = JZ4740_DMA_TRANSFER_SIZE_16BYTE;
 351         dma_config->request_type = JZ4740_DMA_TYPE_AIC_TRANSMIT;
 352         dma_config->flags = JZ4740_DMA_SRC_AUTOINC;
 353         dma_config->mode = JZ4740_DMA_MODE_SINGLE;
 354         i2s->pcm_config_playback.fifo_addr = i2s->phys_base + JZ_REG_AIC_FIFO;
 355
 356         /* Capture */
 357         dma_config = &i2s->pcm_config_capture.dma_config;
 358         dma_config->dst_width = JZ4740_DMA_WIDTH_32BIT;
 359         dma_config->transfer_size = JZ4740_DMA_TRANSFER_SIZE_16BYTE;
 360         dma_config->request_type = JZ4740_DMA_TYPE_AIC_RECEIVE;
 361         dma_config->flags = JZ4740_DMA_DST_AUTOINC;
 362         dma_config->mode = JZ4740_DMA_MODE_SINGLE;
 363         i2s->pcm_config_capture.fifo_addr = i2s->phys_base + JZ_REG_AIC_FIFO;
 364 }
 365
 366 static int jz4740_i2s_dai_probe(struct snd_soc_dai *dai)
 367 {
 368         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 369         uint32_t conf;
 370
 371         clk_prepare_enable(i2s->clk_aic);
 372
 373         jz4740_i2c_init_pcm_config(i2s);
 374
 375         conf = (7 << JZ_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET) |
 376                 (8 << JZ_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET) |
 377                 JZ_AIC_CONF_OVERFLOW_PLAY_LAST |
 378                 JZ_AIC_CONF_I2S |
 379                 JZ_AIC_CONF_INTERNAL_CODEC;
 380
 381         jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, JZ_AIC_CONF_RESET);
 382         jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
 383
 384         return 0;
 385 }
 386
 387 static int jz4740_i2s_dai_remove(struct snd_soc_dai *dai)
 388 {
 389         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 390
 391         clk_disable_unprepare(i2s->clk_aic);
 392         return 0;
 393 }
 394
 395 static const struct snd_soc_dai_ops jz4740_i2s_dai_ops = {
 396         .startup = jz4740_i2s_startup,
 397         .shutdown = jz4740_i2s_shutdown,
 398         .trigger = jz4740_i2s_trigger,
 399         .hw_params = jz4740_i2s_hw_params,
 400         .set_fmt = jz4740_i2s_set_fmt,
 401         .set_sysclk = jz4740_i2s_set_sysclk,
 402 };
 403
 404 #define JZ4740_I2S_FMTS (SNDRV_PCM_FMTBIT_S8 | \
 405                 SNDRV_PCM_FMTBIT_S16_LE)
 406
 407 static struct snd_soc_dai_driver jz4740_i2s_dai = {
 408         .probe = jz4740_i2s_dai_probe,
 409         .remove = jz4740_i2s_dai_remove,
 410         .playback = {
 411                 .channels_min = 1,
 412                 .channels_max = 2,
 413                 .rates = SNDRV_PCM_RATE_8000_48000,
 414                 .formats = JZ4740_I2S_FMTS,
 415         },
 416         .capture = {
 417                 .channels_min = 2,
 418                 .channels_max = 2,
 419                 .rates = SNDRV_PCM_RATE_8000_48000,
 420                 .formats = JZ4740_I2S_FMTS,
 421         },
 422         .symmetric_rates = 1,
 423         .ops = &jz4740_i2s_dai_ops,
 424         .suspend = jz4740_i2s_suspend,
 425         .resume = jz4740_i2s_resume,
 426 };
 427
 428 static const struct snd_soc_component_driver jz4740_i2s_component = {
 429         .name           = "jz4740-i2s",
 430 };
 431
 432 static int jz4740_i2s_dev_probe(struct platform_device *pdev)
 433 {
 434         struct jz4740_i2s *i2s;
 435         int ret;
 436
 437         i2s = kzalloc(sizeof(*i2s), GFP_KERNEL);
 438
 439         if (!i2s)
 440                 return -ENOMEM;
 441
 442         i2s->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 443         if (!i2s->mem) {
 444                 ret = -ENOENT;
 445                 goto err_free;
 446         }
 447
 448         i2s->mem = request_mem_region(i2s->mem->start, resource_size(i2s->mem),
 449                                 pdev->name);
 450         if (!i2s->mem) {
 451                 ret = -EBUSY;
 452                 goto err_free;
 453         }
 454
 455         i2s->base = ioremap_nocache(i2s->mem->start, resource_size(i2s->mem));
 456         if (!i2s->base) {
 457                 ret = -EBUSY;
 458                 goto err_release_mem_region;
 459         }
 460
 461         i2s->phys_base = i2s->mem->start;
 462
 463         i2s->clk_aic = clk_get(&pdev->dev, "aic");
 464         if (IS_ERR(i2s->clk_aic)) {
 465                 ret = PTR_ERR(i2s->clk_aic);
 466                 goto err_iounmap;
 467         }
 468
 469         i2s->clk_i2s = clk_get(&pdev->dev, "i2s");
 470         if (IS_ERR(i2s->clk_i2s)) {
 471                 ret = PTR_ERR(i2s->clk_i2s);
 472                 goto err_clk_put_aic;
 473         }
 474
 475         platform_set_drvdata(pdev, i2s);
 476         ret = snd_soc_register_component(&pdev->dev, &jz4740_i2s_component,
 477                                          &jz4740_i2s_dai, 1);
 478
 479         if (ret) {
 480                 dev_err(&pdev->dev, "Failed to register DAI\n");
 481                 goto err_clk_put_i2s;
 482         }
 483
 484         return 0;
 485
 486 err_clk_put_i2s:
 487         clk_put(i2s->clk_i2s);
 488 err_clk_put_aic:
 489         clk_put(i2s->clk_aic);
 490 err_iounmap:
 491         iounmap(i2s->base);
 492 err_release_mem_region:
 493         release_mem_region(i2s->mem->start, resource_size(i2s->mem));
 494 err_free:
 495         kfree(i2s);
 496
 497         return ret;
 498 }
 499
 500 static int jz4740_i2s_dev_remove(struct platform_device *pdev)
 501 {
 502         struct jz4740_i2s *i2s = platform_get_drvdata(pdev);
 503
 504         snd_soc_unregister_component(&pdev->dev);
 505
 506         clk_put(i2s->clk_i2s);
 507         clk_put(i2s->clk_aic);
 508
 509         iounmap(i2s->base);
 510         release_mem_region(i2s->mem->start, resource_size(i2s->mem));
 511
 512         kfree(i2s);
 513
 514         return 0;
 515 }
 516
 517 static struct platform_driver jz4740_i2s_driver = {
 518         .probe = jz4740_i2s_dev_probe,
 519         .remove = jz4740_i2s_dev_remove,
 520         .driver = {
 521                 .name = "jz4740-i2s",
 522                 .owner = THIS_MODULE,
 523         },
 524 };
 525
 526 module_platform_driver(jz4740_i2s_driver);
 527
 528 MODULE_AUTHOR("Lars-Peter Clausen, <lars@metafoo.de>");
 529 MODULE_DESCRIPTION("Ingenic JZ4740 SoC I2S driver");
 530 MODULE_LICENSE("GPL");
 531 MODULE_ALIAS("platform:jz4740-i2s");