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 void s3c_pcm_snd_txctrl(struct s3c_pcm_info *pcm, int on)
  68 {
  69         void __iomem *regs = pcm->regs;
  70         u32 ctl, clkctl;
  71
  72         clkctl = readl(regs + S3C_PCM_CLKCTL);
  73         ctl = readl(regs + S3C_PCM_CTL);
  74         ctl &= ~(S3C_PCM_CTL_TXDIPSTICK_MASK
  75                          << S3C_PCM_CTL_TXDIPSTICK_SHIFT);
  76
  77         if (on) {
  78                 ctl |= S3C_PCM_CTL_TXDMA_EN;
  79                 ctl |= S3C_PCM_CTL_TXFIFO_EN;
  80                 ctl |= S3C_PCM_CTL_ENABLE;
  81                 ctl |= (0x20<<S3C_PCM_CTL_TXDIPSTICK_SHIFT);
  82                 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
  83         } else {
  84                 ctl &= ~S3C_PCM_CTL_TXDMA_EN;
  85                 ctl &= ~S3C_PCM_CTL_TXFIFO_EN;
  86
  87                 if (!(ctl & S3C_PCM_CTL_RXFIFO_EN)) {
  88                         ctl &= ~S3C_PCM_CTL_ENABLE;
  89                         if (!pcm->idleclk)
  90                                 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
  91                 }
  92         }
  93
  94         writel(clkctl, regs + S3C_PCM_CLKCTL);
  95         writel(ctl, regs + S3C_PCM_CTL);
  96 }
  97
  98 static void s3c_pcm_snd_rxctrl(struct s3c_pcm_info *pcm, int on)
  99 {
 100         void __iomem *regs = pcm->regs;
 101         u32 ctl, clkctl;
 102
 103         ctl = readl(regs + S3C_PCM_CTL);
 104         clkctl = readl(regs + S3C_PCM_CLKCTL);
 105
 106         if (on) {
 107                 ctl |= S3C_PCM_CTL_RXDMA_EN;
 108                 ctl |= S3C_PCM_CTL_RXFIFO_EN;
 109                 ctl |= S3C_PCM_CTL_ENABLE;
 110                 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
 111         } else {
 112                 ctl &= ~S3C_PCM_CTL_RXDMA_EN;
 113                 ctl &= ~S3C_PCM_CTL_RXFIFO_EN;
 114
 115                 if (!(ctl & S3C_PCM_CTL_TXFIFO_EN)) {
 116                         ctl &= ~S3C_PCM_CTL_ENABLE;
 117                         if (!pcm->idleclk)
 118                                 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
 119                 }
 120         }
 121
 122         writel(clkctl, regs + S3C_PCM_CLKCTL);
 123         writel(ctl, regs + S3C_PCM_CTL);
 124 }
 125
 126 static int s3c_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
 127                                struct snd_soc_dai *dai)
 128 {
 129         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 130         struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
 131         unsigned long flags;
 132
 133         dev_dbg(pcm->dev, "Entered %s\n", __func__);
 134
 135         switch (cmd) {
 136         case SNDRV_PCM_TRIGGER_START:
 137         case SNDRV_PCM_TRIGGER_RESUME:
 138         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 139                 spin_lock_irqsave(&pcm->lock, flags);
 140
 141                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 142                         s3c_pcm_snd_rxctrl(pcm, 1);
 143                 else
 144                         s3c_pcm_snd_txctrl(pcm, 1);
 145
 146                 spin_unlock_irqrestore(&pcm->lock, flags);
 147                 break;
 148
 149         case SNDRV_PCM_TRIGGER_STOP:
 150         case SNDRV_PCM_TRIGGER_SUSPEND:
 151         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 152                 spin_lock_irqsave(&pcm->lock, flags);
 153
 154                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 155                         s3c_pcm_snd_rxctrl(pcm, 0);
 156                 else
 157                         s3c_pcm_snd_txctrl(pcm, 0);
 158
 159                 spin_unlock_irqrestore(&pcm->lock, flags);
 160                 break;
 161
 162         default:
 163                 return -EINVAL;
 164         }
 165
 166         return 0;
 167 }
 168
 169 static int s3c_pcm_hw_params(struct snd_pcm_substream *substream,
 170                                  struct snd_pcm_hw_params *params,
 171                                  struct snd_soc_dai *socdai)
 172 {
 173         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 174         struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
 175         struct s3c_dma_params *dma_data;
 176         void __iomem *regs = pcm->regs;
 177         struct clk *clk;
 178         int sclk_div, sync_div;
 179         unsigned long flags;
 180         u32 clkctl;
 181
 182         dev_dbg(pcm->dev, "Entered %s\n", __func__);
 183
 184         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 185                 dma_data = pcm->dma_playback;
 186         else
 187                 dma_data = pcm->dma_capture;
 188
 189         snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
 190
 191         /* Strictly check for sample size */
 192         switch (params_format(params)) {
 193         case SNDRV_PCM_FORMAT_S16_LE:
 194                 break;
 195         default:
 196                 return -EINVAL;
 197         }
 198
 199         spin_lock_irqsave(&pcm->lock, flags);
 200
 201         /* Get hold of the PCMSOURCE_CLK */
 202         clkctl = readl(regs + S3C_PCM_CLKCTL);
 203         if (clkctl & S3C_PCM_CLKCTL_SERCLKSEL_PCLK)
 204                 clk = pcm->pclk;
 205         else
 206                 clk = pcm->cclk;
 207
 208         /* Set the SCLK divider */
 209         sclk_div = clk_get_rate(clk) / pcm->sclk_per_fs /
 210                                         params_rate(params) / 2 - 1;
 211
 212         clkctl &= ~(S3C_PCM_CLKCTL_SCLKDIV_MASK
 213                         << S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
 214         clkctl |= ((sclk_div & S3C_PCM_CLKCTL_SCLKDIV_MASK)
 215                         << S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
 216
 217         /* Set the SYNC divider */
 218         sync_div = pcm->sclk_per_fs - 1;
 219
 220         clkctl &= ~(S3C_PCM_CLKCTL_SYNCDIV_MASK
 221                                 << S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
 222         clkctl |= ((sync_div & S3C_PCM_CLKCTL_SYNCDIV_MASK)
 223                                 << S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
 224
 225         writel(clkctl, regs + S3C_PCM_CLKCTL);
 226
 227         spin_unlock_irqrestore(&pcm->lock, flags);
 228
 229         dev_dbg(pcm->dev, "PCMSOURCE_CLK-%lu SCLK=%ufs SCLK_DIV=%d SYNC_DIV=%d\n",
 230                                 clk_get_rate(clk), pcm->sclk_per_fs,
 231                                 sclk_div, sync_div);
 232
 233         return 0;
 234 }
 235
 236 static int s3c_pcm_set_fmt(struct snd_soc_dai *cpu_dai,
 237                                unsigned int fmt)
 238 {
 239         struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
 240         void __iomem *regs = pcm->regs;
 241         unsigned long flags;
 242         int ret = 0;
 243         u32 ctl;
 244
 245         dev_dbg(pcm->dev, "Entered %s\n", __func__);
 246
 247         spin_lock_irqsave(&pcm->lock, flags);
 248
 249         ctl = readl(regs + S3C_PCM_CTL);
 250
 251         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 252         case SND_SOC_DAIFMT_NB_NF:
 253                 /* Nothing to do, NB_NF by default */
 254                 break;
 255         default:
 256                 dev_err(pcm->dev, "Unsupported clock inversion!\n");
 257                 ret = -EINVAL;
 258                 goto exit;
 259         }
 260
 261         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 262         case SND_SOC_DAIFMT_CBS_CFS:
 263                 /* Nothing to do, Master by default */
 264                 break;
 265         default:
 266                 dev_err(pcm->dev, "Unsupported master/slave format!\n");
 267                 ret = -EINVAL;
 268                 goto exit;
 269         }
 270
 271         switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
 272         case SND_SOC_DAIFMT_CONT:
 273                 pcm->idleclk = 1;
 274                 break;
 275         case SND_SOC_DAIFMT_GATED:
 276                 pcm->idleclk = 0;
 277                 break;
 278         default:
 279                 dev_err(pcm->dev, "Invalid Clock gating request!\n");
 280                 ret = -EINVAL;
 281                 goto exit;
 282         }
 283
 284         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 285         case SND_SOC_DAIFMT_DSP_A:
 286                 ctl |= S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
 287                 ctl |= S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
 288                 break;
 289         case SND_SOC_DAIFMT_DSP_B:
 290                 ctl &= ~S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
 291                 ctl &= ~S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
 292                 break;
 293         default:
 294                 dev_err(pcm->dev, "Unsupported data format!\n");
 295                 ret = -EINVAL;
 296                 goto exit;
 297         }
 298
 299         writel(ctl, regs + S3C_PCM_CTL);
 300
 301 exit:
 302         spin_unlock_irqrestore(&pcm->lock, flags);
 303
 304         return ret;
 305 }
 306
 307 static int s3c_pcm_set_clkdiv(struct snd_soc_dai *cpu_dai,
 308                                                 int div_id, int div)
 309 {
 310         struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
 311
 312         switch (div_id) {
 313         case S3C_PCM_SCLK_PER_FS:
 314                 pcm->sclk_per_fs = div;
 315                 break;
 316
 317         default:
 318                 return -EINVAL;
 319         }
 320
 321         return 0;
 322 }
 323
 324 static int s3c_pcm_set_sysclk(struct snd_soc_dai *cpu_dai,
 325                                   int clk_id, unsigned int freq, int dir)
 326 {
 327         struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
 328         void __iomem *regs = pcm->regs;
 329         u32 clkctl = readl(regs + S3C_PCM_CLKCTL);
 330
 331         switch (clk_id) {
 332         case S3C_PCM_CLKSRC_PCLK:
 333                 clkctl |= S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
 334                 break;
 335
 336         case S3C_PCM_CLKSRC_MUX:
 337                 clkctl &= ~S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
 338
 339                 if (clk_get_rate(pcm->cclk) != freq)
 340                         clk_set_rate(pcm->cclk, freq);
 341
 342                 break;
 343
 344         default:
 345                 return -EINVAL;
 346         }
 347
 348         writel(clkctl, regs + S3C_PCM_CLKCTL);
 349
 350         return 0;
 351 }
 352
 353 static struct snd_soc_dai_ops s3c_pcm_dai_ops = {
 354         .set_sysclk     = s3c_pcm_set_sysclk,
 355         .set_clkdiv     = s3c_pcm_set_clkdiv,
 356         .trigger        = s3c_pcm_trigger,
 357         .hw_params      = s3c_pcm_hw_params,
 358         .set_fmt        = s3c_pcm_set_fmt,
 359 };
 360
 361 #define S3C_PCM_RATES  SNDRV_PCM_RATE_8000_96000
 362
 363 #define S3C_PCM_DAI_DECLARE                     \
 364 {                                                               \
 365         .name            = "samsung-dai",                       \
 366         .symmetric_rates = 1,                                   \
 367         .ops = &s3c_pcm_dai_ops,                                \
 368         .playback = {                                           \
 369                 .channels_min   = 2,                            \
 370                 .channels_max   = 2,                            \
 371                 .rates          = S3C_PCM_RATES,                \
 372                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,      \
 373         },                                                      \
 374         .capture = {                                            \
 375                 .channels_min   = 2,                            \
 376                 .channels_max   = 2,                            \
 377                 .rates          = S3C_PCM_RATES,                \
 378                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,      \
 379         },                                                      \
 380 }
 381
 382 struct snd_soc_dai_driver s3c_pcm_dai[] = {
 383         S3C_PCM_DAI_DECLARE,
 384         S3C_PCM_DAI_DECLARE,
 385 };
 386 EXPORT_SYMBOL_GPL(s3c_pcm_dai);
 387
 388 static __devinit int s3c_pcm_dev_probe(struct platform_device *pdev)
 389 {
 390         struct s3c_pcm_info *pcm;
 391         struct resource *mem_res, *dmatx_res, *dmarx_res;
 392         struct s3c_audio_pdata *pcm_pdata;
 393         int ret;
 394
 395         /* Check for valid device index */
 396         if ((pdev->id < 0) || pdev->id >= ARRAY_SIZE(s3c_pcm)) {
 397                 dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
 398                 return -EINVAL;
 399         }
 400
 401         pcm_pdata = pdev->dev.platform_data;
 402
 403         /* Check for availability of necessary resource */
 404         dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 405         if (!dmatx_res) {
 406                 dev_err(&pdev->dev, "Unable to get PCM-TX dma resource\n");
 407                 return -ENXIO;
 408         }
 409
 410         dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 411         if (!dmarx_res) {
 412                 dev_err(&pdev->dev, "Unable to get PCM-RX dma resource\n");
 413                 return -ENXIO;
 414         }
 415
 416         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 417         if (!mem_res) {
 418                 dev_err(&pdev->dev, "Unable to get register resource\n");
 419                 return -ENXIO;
 420         }
 421
 422         if (pcm_pdata && pcm_pdata->cfg_gpio && pcm_pdata->cfg_gpio(pdev)) {
 423                 dev_err(&pdev->dev, "Unable to configure gpio\n");
 424                 return -EINVAL;
 425         }
 426
 427         pcm = &s3c_pcm[pdev->id];
 428         pcm->dev = &pdev->dev;
 429
 430         spin_lock_init(&pcm->lock);
 431
 432         /* Default is 128fs */
 433         pcm->sclk_per_fs = 128;
 434
 435         pcm->cclk = clk_get(&pdev->dev, "audio-bus");
 436         if (IS_ERR(pcm->cclk)) {
 437                 dev_err(&pdev->dev, "failed to get audio-bus\n");
 438                 ret = PTR_ERR(pcm->cclk);
 439                 goto err1;
 440         }
 441         clk_enable(pcm->cclk);
 442
 443         /* record our pcm structure for later use in the callbacks */
 444         dev_set_drvdata(&pdev->dev, pcm);
 445
 446         if (!request_mem_region(mem_res->start,
 447                                 resource_size(mem_res), "samsung-pcm")) {
 448                 dev_err(&pdev->dev, "Unable to request register region\n");
 449                 ret = -EBUSY;
 450                 goto err2;
 451         }
 452
 453         pcm->regs = ioremap(mem_res->start, 0x100);
 454         if (pcm->regs == NULL) {
 455                 dev_err(&pdev->dev, "cannot ioremap registers\n");
 456                 ret = -ENXIO;
 457                 goto err3;
 458         }
 459
 460         pcm->pclk = clk_get(&pdev->dev, "pcm");
 461         if (IS_ERR(pcm->pclk)) {
 462                 dev_err(&pdev->dev, "failed to get pcm_clock\n");
 463                 ret = -ENOENT;
 464                 goto err4;
 465         }
 466         clk_enable(pcm->pclk);
 467
 468         ret = snd_soc_register_dai(&pdev->dev, s3c_pcm_dai);
 469         if (ret != 0) {
 470                 dev_err(&pdev->dev, "failed to get pcm_clock\n");
 471                 goto err5;
 472         }
 473
 474         s3c_pcm_stereo_in[pdev->id].dma_addr = mem_res->start
 475                                                         + S3C_PCM_RXFIFO;
 476         s3c_pcm_stereo_out[pdev->id].dma_addr = mem_res->start
 477                                                         + S3C_PCM_TXFIFO;
 478
 479         s3c_pcm_stereo_in[pdev->id].channel = dmarx_res->start;
 480         s3c_pcm_stereo_out[pdev->id].channel = dmatx_res->start;
 481
 482         pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id];
 483         pcm->dma_playback = &s3c_pcm_stereo_out[pdev->id];
 484
 485         return 0;
 486
 487 err5:
 488         clk_disable(pcm->pclk);
 489         clk_put(pcm->pclk);
 490 err4:
 491         iounmap(pcm->regs);
 492 err3:
 493         release_mem_region(mem_res->start, resource_size(mem_res));
 494 err2:
 495         clk_disable(pcm->cclk);
 496         clk_put(pcm->cclk);
 497 err1:
 498         return ret;
 499 }
 500
 501 static __devexit int s3c_pcm_dev_remove(struct platform_device *pdev)
 502 {
 503         struct s3c_pcm_info *pcm = &s3c_pcm[pdev->id];
 504         struct resource *mem_res;
 505
 506         snd_soc_unregister_dai(&pdev->dev);
 507
 508         iounmap(pcm->regs);
 509
 510         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 511         release_mem_region(mem_res->start, resource_size(mem_res));
 512
 513         clk_disable(pcm->cclk);
 514         clk_disable(pcm->pclk);
 515         clk_put(pcm->pclk);
 516         clk_put(pcm->cclk);
 517
 518         return 0;
 519 }
 520
 521 static struct platform_driver s3c_pcm_driver = {
 522         .probe  = s3c_pcm_dev_probe,
 523         .remove = s3c_pcm_dev_remove,
 524         .driver = {
 525                 .name = "samsung-pcm-audio",
 526                 .owner = THIS_MODULE,
 527         },
 528 };
 529
 530 static int __init s3c_pcm_init(void)
 531 {
 532         return platform_driver_register(&s3c_pcm_driver);
 533 }
 534 module_init(s3c_pcm_init);
 535
 536 static void __exit s3c_pcm_exit(void)
 537 {
 538         platform_driver_unregister(&s3c_pcm_driver);
 539 }
 540 module_exit(s3c_pcm_exit);
 541
 542 /* Module information */
 543 MODULE_AUTHOR("Jaswinder Singh, <jassi.brar@samsung.com>");
 544 MODULE_DESCRIPTION("S3C PCM Controller Driver");
 545 MODULE_LICENSE("GPL");
 546 MODULE_ALIAS("platform:samsung-pcm-audio");