sound/soc/s3c24xx/s3c-pcm.c

   1 /* sound/soc/s3c24xx/s3c-pcm.c
   2  *
   3  * ALSA SoC Audio Layer - S3C PCM-Controller driver
   4  *
   5  * Copyright (c) 2009 Samsung Electronics Co. Ltd
   6  * Author: Jaswinder Singh <jassi.brar@samsung.com>
   7  * based upon I2S drivers by Ben Dooks.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16 #include <linux/device.h>
  17 #include <linux/delay.h>
  18 #include <linux/clk.h>
  19 #include <linux/kernel.h>
  20 #include <linux/gpio.h>
  21 #include <linux/io.h>
  22
  23 #include <sound/core.h>
  24 #include <sound/pcm.h>
  25 #include <sound/pcm_params.h>
  26 #include <sound/initval.h>
  27 #include <sound/soc.h>
  28
  29 #include <plat/audio.h>
  30 #include <plat/dma.h>
  31
  32 #include "s3c-dma.h"
  33 #include "s3c-pcm.h"
  34
  35 static struct s3c2410_dma_client s3c_pcm_dma_client_out = {
  36         .name           = "PCM Stereo out"
  37 };
  38
  39 static struct s3c2410_dma_client s3c_pcm_dma_client_in = {
  40         .name           = "PCM Stereo in"
  41 };
  42
  43 static struct s3c_dma_params s3c_pcm_stereo_out[] = {
  44         [0] = {
  45                 .client         = &s3c_pcm_dma_client_out,
  46                 .dma_size       = 4,
  47         },
  48         [1] = {
  49                 .client         = &s3c_pcm_dma_client_out,
  50                 .dma_size       = 4,
  51         },
  52 };
  53
  54 static struct s3c_dma_params s3c_pcm_stereo_in[] = {
  55         [0] = {
  56                 .client         = &s3c_pcm_dma_client_in,
  57                 .dma_size       = 4,
  58         },
  59         [1] = {
  60                 .client         = &s3c_pcm_dma_client_in,
  61                 .dma_size       = 4,
  62         },
  63 };
  64
  65 static struct s3c_pcm_info s3c_pcm[2];
  66
  67 static inline struct s3c_pcm_info *to_info(struct snd_soc_dai *cpu_dai)
  68 {
  69         return cpu_dai->private_data;
  70 }
  71
  72 static void s3c_pcm_snd_txctrl(struct s3c_pcm_info *pcm, int on)
  73 {
  74         void __iomem *regs = pcm->regs;
  75         u32 ctl, clkctl;
  76
  77         clkctl = readl(regs + S3C_PCM_CLKCTL);
  78         ctl = readl(regs + S3C_PCM_CTL);
  79         ctl &= ~(S3C_PCM_CTL_TXDIPSTICK_MASK
  80                          << S3C_PCM_CTL_TXDIPSTICK_SHIFT);
  81
  82         if (on) {
  83                 ctl |= S3C_PCM_CTL_TXDMA_EN;
  84                 ctl |= S3C_PCM_CTL_TXFIFO_EN;
  85                 ctl |= S3C_PCM_CTL_ENABLE;
  86                 ctl |= (0x20<<S3C_PCM_CTL_TXDIPSTICK_SHIFT);
  87                 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
  88         } else {
  89                 ctl &= ~S3C_PCM_CTL_TXDMA_EN;
  90                 ctl &= ~S3C_PCM_CTL_TXFIFO_EN;
  91
  92                 if (!(ctl & S3C_PCM_CTL_RXFIFO_EN)) {
  93                         ctl &= ~S3C_PCM_CTL_ENABLE;
  94                         if (!pcm->idleclk)
  95                                 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
  96                 }
  97         }
  98
  99         writel(clkctl, regs + S3C_PCM_CLKCTL);
 100         writel(ctl, regs + S3C_PCM_CTL);
 101 }
 102
 103 static void s3c_pcm_snd_rxctrl(struct s3c_pcm_info *pcm, int on)
 104 {
 105         void __iomem *regs = pcm->regs;
 106         u32 ctl, clkctl;
 107
 108         ctl = readl(regs + S3C_PCM_CTL);
 109         clkctl = readl(regs + S3C_PCM_CLKCTL);
 110
 111         if (on) {
 112                 ctl |= S3C_PCM_CTL_RXDMA_EN;
 113                 ctl |= S3C_PCM_CTL_RXFIFO_EN;
 114                 ctl |= S3C_PCM_CTL_ENABLE;
 115                 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
 116         } else {
 117                 ctl &= ~S3C_PCM_CTL_RXDMA_EN;
 118                 ctl &= ~S3C_PCM_CTL_RXFIFO_EN;
 119
 120                 if (!(ctl & S3C_PCM_CTL_TXFIFO_EN)) {
 121                         ctl &= ~S3C_PCM_CTL_ENABLE;
 122                         if (!pcm->idleclk)
 123                                 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
 124                 }
 125         }
 126
 127         writel(clkctl, regs + S3C_PCM_CLKCTL);
 128         writel(ctl, regs + S3C_PCM_CTL);
 129 }
 130
 131 static int s3c_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
 132                                struct snd_soc_dai *dai)
 133 {
 134         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 135         struct s3c_pcm_info *pcm = to_info(rtd->dai->cpu_dai);
 136         unsigned long flags;
 137
 138         dev_dbg(pcm->dev, "Entered %s\n", __func__);
 139
 140         switch (cmd) {
 141         case SNDRV_PCM_TRIGGER_START:
 142         case SNDRV_PCM_TRIGGER_RESUME:
 143         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 144                 spin_lock_irqsave(&pcm->lock, flags);
 145
 146                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 147                         s3c_pcm_snd_rxctrl(pcm, 1);
 148                 else
 149                         s3c_pcm_snd_txctrl(pcm, 1);
 150
 151                 spin_unlock_irqrestore(&pcm->lock, flags);
 152                 break;
 153
 154         case SNDRV_PCM_TRIGGER_STOP:
 155         case SNDRV_PCM_TRIGGER_SUSPEND:
 156         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 157                 spin_lock_irqsave(&pcm->lock, flags);
 158
 159                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 160                         s3c_pcm_snd_rxctrl(pcm, 0);
 161                 else
 162                         s3c_pcm_snd_txctrl(pcm, 0);
 163
 164                 spin_unlock_irqrestore(&pcm->lock, flags);
 165                 break;
 166
 167         default:
 168                 return -EINVAL;
 169         }
 170
 171         return 0;
 172 }
 173
 174 static int s3c_pcm_hw_params(struct snd_pcm_substream *substream,
 175                                  struct snd_pcm_hw_params *params,
 176                                  struct snd_soc_dai *socdai)
 177 {
 178         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 179         struct snd_soc_dai_link *dai = rtd->dai;
 180         struct s3c_pcm_info *pcm = to_info(dai->cpu_dai);
 181         struct s3c_dma_params *dma_data;
 182         void __iomem *regs = pcm->regs;
 183         struct clk *clk;
 184         int sclk_div, sync_div;
 185         unsigned long flags;
 186         u32 clkctl;
 187
 188         dev_dbg(pcm->dev, "Entered %s\n", __func__);
 189
 190         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 191                 dma_data = pcm->dma_playback;
 192         else
 193                 dma_data = pcm->dma_capture;
 194
 195         snd_soc_dai_set_dma_data(dai->cpu_dai, substream, dma_data);
 196
 197         /* Strictly check for sample size */
 198         switch (params_format(params)) {
 199         case SNDRV_PCM_FORMAT_S16_LE:
 200                 break;
 201         default:
 202                 return -EINVAL;
 203         }
 204
 205         spin_lock_irqsave(&pcm->lock, flags);
 206
 207         /* Get hold of the PCMSOURCE_CLK */
 208         clkctl = readl(regs + S3C_PCM_CLKCTL);
 209         if (clkctl & S3C_PCM_CLKCTL_SERCLKSEL_PCLK)
 210                 clk = pcm->pclk;
 211         else
 212                 clk = pcm->cclk;
 213
 214         /* Set the SCLK divider */
 215         sclk_div = clk_get_rate(clk) / pcm->sclk_per_fs /
 216                                         params_rate(params) / 2 - 1;
 217
 218         clkctl &= ~(S3C_PCM_CLKCTL_SCLKDIV_MASK
 219                         << S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
 220         clkctl |= ((sclk_div & S3C_PCM_CLKCTL_SCLKDIV_MASK)
 221                         << S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
 222
 223         /* Set the SYNC divider */
 224         sync_div = pcm->sclk_per_fs - 1;
 225
 226         clkctl &= ~(S3C_PCM_CLKCTL_SYNCDIV_MASK
 227                                 << S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
 228         clkctl |= ((sync_div & S3C_PCM_CLKCTL_SYNCDIV_MASK)
 229                                 << S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
 230
 231         writel(clkctl, regs + S3C_PCM_CLKCTL);
 232
 233         spin_unlock_irqrestore(&pcm->lock, flags);
 234
 235         dev_dbg(pcm->dev, "PCMSOURCE_CLK-%lu SCLK=%ufs SCLK_DIV=%d SYNC_DIV=%d\n",
 236                                 clk_get_rate(clk), pcm->sclk_per_fs,
 237                                 sclk_div, sync_div);
 238
 239         return 0;
 240 }
 241
 242 static int s3c_pcm_set_fmt(struct snd_soc_dai *cpu_dai,
 243                                unsigned int fmt)
 244 {
 245         struct s3c_pcm_info *pcm = to_info(cpu_dai);
 246         void __iomem *regs = pcm->regs;
 247         unsigned long flags;
 248         int ret = 0;
 249         u32 ctl;
 250
 251         dev_dbg(pcm->dev, "Entered %s\n", __func__);
 252
 253         spin_lock_irqsave(&pcm->lock, flags);
 254
 255         ctl = readl(regs + S3C_PCM_CTL);
 256
 257         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 258         case SND_SOC_DAIFMT_NB_NF:
 259                 /* Nothing to do, NB_NF by default */
 260                 break;
 261         default:
 262                 dev_err(pcm->dev, "Unsupported clock inversion!\n");
 263                 ret = -EINVAL;
 264                 goto exit;
 265         }
 266
 267         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 268         case SND_SOC_DAIFMT_CBS_CFS:
 269                 /* Nothing to do, Master by default */
 270                 break;
 271         default:
 272                 dev_err(pcm->dev, "Unsupported master/slave format!\n");
 273                 ret = -EINVAL;
 274                 goto exit;
 275         }
 276
 277         switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
 278         case SND_SOC_DAIFMT_CONT:
 279                 pcm->idleclk = 1;
 280                 break;
 281         case SND_SOC_DAIFMT_GATED:
 282                 pcm->idleclk = 0;
 283                 break;
 284         default:
 285                 dev_err(pcm->dev, "Invalid Clock gating request!\n");
 286                 ret = -EINVAL;
 287                 goto exit;
 288         }
 289
 290         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 291         case SND_SOC_DAIFMT_DSP_A:
 292                 ctl |= S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
 293                 ctl |= S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
 294                 break;
 295         case SND_SOC_DAIFMT_DSP_B:
 296                 ctl &= ~S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
 297                 ctl &= ~S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
 298                 break;
 299         default:
 300                 dev_err(pcm->dev, "Unsupported data format!\n");
 301                 ret = -EINVAL;
 302                 goto exit;
 303         }
 304
 305         writel(ctl, regs + S3C_PCM_CTL);
 306
 307 exit:
 308         spin_unlock_irqrestore(&pcm->lock, flags);
 309
 310         return ret;
 311 }
 312
 313 static int s3c_pcm_set_clkdiv(struct snd_soc_dai *cpu_dai,
 314                                                 int div_id, int div)
 315 {
 316         struct s3c_pcm_info *pcm = to_info(cpu_dai);
 317
 318         switch (div_id) {
 319         case S3C_PCM_SCLK_PER_FS:
 320                 pcm->sclk_per_fs = div;
 321                 break;
 322
 323         default:
 324                 return -EINVAL;
 325         }
 326
 327         return 0;
 328 }
 329
 330 static int s3c_pcm_set_sysclk(struct snd_soc_dai *cpu_dai,
 331                                   int clk_id, unsigned int freq, int dir)
 332 {
 333         struct s3c_pcm_info *pcm = to_info(cpu_dai);
 334         void __iomem *regs = pcm->regs;
 335         u32 clkctl = readl(regs + S3C_PCM_CLKCTL);
 336
 337         switch (clk_id) {
 338         case S3C_PCM_CLKSRC_PCLK:
 339                 clkctl |= S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
 340                 break;
 341
 342         case S3C_PCM_CLKSRC_MUX:
 343                 clkctl &= ~S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
 344
 345                 if (clk_get_rate(pcm->cclk) != freq)
 346                         clk_set_rate(pcm->cclk, freq);
 347
 348                 break;
 349
 350         default:
 351                 return -EINVAL;
 352         }
 353
 354         writel(clkctl, regs + S3C_PCM_CLKCTL);
 355
 356         return 0;
 357 }
 358
 359 static struct snd_soc_dai_ops s3c_pcm_dai_ops = {
 360         .set_sysclk     = s3c_pcm_set_sysclk,
 361         .set_clkdiv     = s3c_pcm_set_clkdiv,
 362         .trigger        = s3c_pcm_trigger,
 363         .hw_params      = s3c_pcm_hw_params,
 364         .set_fmt        = s3c_pcm_set_fmt,
 365 };
 366
 367 #define S3C_PCM_RATES  SNDRV_PCM_RATE_8000_96000
 368
 369 #define S3C_PCM_DECLARE(n)                      \
 370 {                                                               \
 371         .name            = "samsung-pcm",                       \
 372         .id              = (n),                         \
 373         .symmetric_rates = 1,                                   \
 374         .ops = &s3c_pcm_dai_ops,                                \
 375         .playback = {                                           \
 376                 .channels_min   = 2,                            \
 377                 .channels_max   = 2,                            \
 378                 .rates          = S3C_PCM_RATES,                \
 379                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,      \
 380         },                                                      \
 381         .capture = {                                            \
 382                 .channels_min   = 2,                            \
 383                 .channels_max   = 2,                            \
 384                 .rates          = S3C_PCM_RATES,                \
 385                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,      \
 386         },                                                      \
 387 }
 388
 389 struct snd_soc_dai s3c_pcm_dai[] = {
 390         S3C_PCM_DECLARE(0),
 391         S3C_PCM_DECLARE(1),
 392 };
 393 EXPORT_SYMBOL_GPL(s3c_pcm_dai);
 394
 395 static __devinit int s3c_pcm_dev_probe(struct platform_device *pdev)
 396 {
 397         struct s3c_pcm_info *pcm;
 398         struct snd_soc_dai *dai;
 399         struct resource *mem_res, *dmatx_res, *dmarx_res;
 400         struct s3c_audio_pdata *pcm_pdata;
 401         int ret;
 402
 403         /* Check for valid device index */
 404         if ((pdev->id < 0) || pdev->id >= ARRAY_SIZE(s3c_pcm)) {
 405                 dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
 406                 return -EINVAL;
 407         }
 408
 409         pcm_pdata = pdev->dev.platform_data;
 410
 411         /* Check for availability of necessary resource */
 412         dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 413         if (!dmatx_res) {
 414                 dev_err(&pdev->dev, "Unable to get PCM-TX dma resource\n");
 415                 return -ENXIO;
 416         }
 417
 418         dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 419         if (!dmarx_res) {
 420                 dev_err(&pdev->dev, "Unable to get PCM-RX dma resource\n");
 421                 return -ENXIO;
 422         }
 423
 424         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 425         if (!mem_res) {
 426                 dev_err(&pdev->dev, "Unable to get register resource\n");
 427                 return -ENXIO;
 428         }
 429
 430         if (pcm_pdata && pcm_pdata->cfg_gpio && pcm_pdata->cfg_gpio(pdev)) {
 431                 dev_err(&pdev->dev, "Unable to configure gpio\n");
 432                 return -EINVAL;
 433         }
 434
 435         pcm = &s3c_pcm[pdev->id];
 436         pcm->dev = &pdev->dev;
 437
 438         spin_lock_init(&pcm->lock);
 439
 440         dai = &s3c_pcm_dai[pdev->id];
 441         dai->dev = &pdev->dev;
 442
 443         /* Default is 128fs */
 444         pcm->sclk_per_fs = 128;
 445
 446         pcm->cclk = clk_get(&pdev->dev, "audio-bus");
 447         if (IS_ERR(pcm->cclk)) {
 448                 dev_err(&pdev->dev, "failed to get audio-bus\n");
 449                 ret = PTR_ERR(pcm->cclk);
 450                 goto err1;
 451         }
 452         clk_enable(pcm->cclk);
 453
 454         /* record our pcm structure for later use in the callbacks */
 455         dai->private_data = pcm;
 456
 457         if (!request_mem_region(mem_res->start,
 458                                 resource_size(mem_res), "samsung-pcm")) {
 459                 dev_err(&pdev->dev, "Unable to request register region\n");
 460                 ret = -EBUSY;
 461                 goto err2;
 462         }
 463
 464         pcm->regs = ioremap(mem_res->start, 0x100);
 465         if (pcm->regs == NULL) {
 466                 dev_err(&pdev->dev, "cannot ioremap registers\n");
 467                 ret = -ENXIO;
 468                 goto err3;
 469         }
 470
 471         pcm->pclk = clk_get(&pdev->dev, "pcm");
 472         if (IS_ERR(pcm->pclk)) {
 473                 dev_err(&pdev->dev, "failed to get pcm_clock\n");
 474                 ret = -ENOENT;
 475                 goto err4;
 476         }
 477         clk_enable(pcm->pclk);
 478
 479         ret = snd_soc_register_dai(dai);
 480         if (ret != 0) {
 481                 dev_err(&pdev->dev, "failed to get pcm_clock\n");
 482                 goto err5;
 483         }
 484
 485         s3c_pcm_stereo_in[pdev->id].dma_addr = mem_res->start
 486                                                         + S3C_PCM_RXFIFO;
 487         s3c_pcm_stereo_out[pdev->id].dma_addr = mem_res->start
 488                                                         + S3C_PCM_TXFIFO;
 489
 490         s3c_pcm_stereo_in[pdev->id].channel = dmarx_res->start;
 491         s3c_pcm_stereo_out[pdev->id].channel = dmatx_res->start;
 492
 493         pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id];
 494         pcm->dma_playback = &s3c_pcm_stereo_out[pdev->id];
 495
 496         return 0;
 497
 498 err5:
 499         clk_disable(pcm->pclk);
 500         clk_put(pcm->pclk);
 501 err4:
 502         iounmap(pcm->regs);
 503 err3:
 504         release_mem_region(mem_res->start, resource_size(mem_res));
 505 err2:
 506         clk_disable(pcm->cclk);
 507         clk_put(pcm->cclk);
 508 err1:
 509         return ret;
 510 }
 511
 512 static __devexit int s3c_pcm_dev_remove(struct platform_device *pdev)
 513 {
 514         struct s3c_pcm_info *pcm = &s3c_pcm[pdev->id];
 515         struct resource *mem_res;
 516
 517         iounmap(pcm->regs);
 518
 519         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 520         release_mem_region(mem_res->start, resource_size(mem_res));
 521
 522         clk_disable(pcm->cclk);
 523         clk_disable(pcm->pclk);
 524         clk_put(pcm->pclk);
 525         clk_put(pcm->cclk);
 526
 527         return 0;
 528 }
 529
 530 static struct platform_driver s3c_pcm_driver = {
 531         .probe  = s3c_pcm_dev_probe,
 532         .remove = s3c_pcm_dev_remove,
 533         .driver = {
 534                 .name = "samsung-pcm",
 535                 .owner = THIS_MODULE,
 536         },
 537 };
 538
 539 static int __init s3c_pcm_init(void)
 540 {
 541         return platform_driver_register(&s3c_pcm_driver);
 542 }
 543 module_init(s3c_pcm_init);
 544
 545 static void __exit s3c_pcm_exit(void)
 546 {
 547         platform_driver_unregister(&s3c_pcm_driver);
 548 }
 549 module_exit(s3c_pcm_exit);
 550
 551 /* Module information */
 552 MODULE_AUTHOR("Jaswinder Singh, <jassi.brar@samsung.com>");
 553 MODULE_DESCRIPTION("S3C PCM Controller Driver");
 554 MODULE_LICENSE("GPL");