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         ctl &= ~(S3C_PCM_CTL_RXDIPSTICK_MASK
 111                          << S3C_PCM_CTL_RXDIPSTICK_SHIFT);
 112
 113         if (on) {
 114                 ctl |= S3C_PCM_CTL_RXDMA_EN;
 115                 ctl |= S3C_PCM_CTL_RXFIFO_EN;
 116                 ctl |= S3C_PCM_CTL_ENABLE;
 117                 ctl |= (0x20<<S3C_PCM_CTL_RXDIPSTICK_SHIFT);
 118                 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
 119         } else {
 120                 ctl &= ~S3C_PCM_CTL_RXDMA_EN;
 121                 ctl &= ~S3C_PCM_CTL_RXFIFO_EN;
 122
 123                 if (!(ctl & S3C_PCM_CTL_TXFIFO_EN)) {
 124                         ctl &= ~S3C_PCM_CTL_ENABLE;
 125                         if (!pcm->idleclk)
 126                                 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
 127                 }
 128         }
 129
 130         writel(clkctl, regs + S3C_PCM_CLKCTL);
 131         writel(ctl, regs + S3C_PCM_CTL);
 132 }
 133
 134 static int s3c_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
 135                                struct snd_soc_dai *dai)
 136 {
 137         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 138         struct s3c_pcm_info *pcm = to_info(rtd->dai->cpu_dai);
 139         unsigned long flags;
 140
 141         dev_dbg(pcm->dev, "Entered %s\n", __func__);
 142
 143         switch (cmd) {
 144         case SNDRV_PCM_TRIGGER_START:
 145         case SNDRV_PCM_TRIGGER_RESUME:
 146         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 147                 spin_lock_irqsave(&pcm->lock, flags);
 148
 149                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 150                         s3c_pcm_snd_rxctrl(pcm, 1);
 151                 else
 152                         s3c_pcm_snd_txctrl(pcm, 1);
 153
 154                 spin_unlock_irqrestore(&pcm->lock, flags);
 155                 break;
 156
 157         case SNDRV_PCM_TRIGGER_STOP:
 158         case SNDRV_PCM_TRIGGER_SUSPEND:
 159         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 160                 spin_lock_irqsave(&pcm->lock, flags);
 161
 162                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 163                         s3c_pcm_snd_rxctrl(pcm, 0);
 164                 else
 165                         s3c_pcm_snd_txctrl(pcm, 0);
 166
 167                 spin_unlock_irqrestore(&pcm->lock, flags);
 168                 break;
 169
 170         default:
 171                 return -EINVAL;
 172         }
 173
 174         return 0;
 175 }
 176
 177 static int s3c_pcm_hw_params(struct snd_pcm_substream *substream,
 178                                  struct snd_pcm_hw_params *params,
 179                                  struct snd_soc_dai *socdai)
 180 {
 181         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 182         struct snd_soc_dai_link *dai = rtd->dai;
 183         struct s3c_pcm_info *pcm = to_info(dai->cpu_dai);
 184         struct s3c_dma_params *dma_data;
 185         void __iomem *regs = pcm->regs;
 186         struct clk *clk;
 187         int sclk_div, sync_div;
 188         unsigned long flags;
 189         u32 clkctl;
 190
 191         dev_dbg(pcm->dev, "Entered %s\n", __func__);
 192
 193         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 194                 dma_data = pcm->dma_playback;
 195         else
 196                 dma_data = pcm->dma_capture;
 197
 198         snd_soc_dai_set_dma_data(dai->cpu_dai, substream, dma_data);
 199
 200         /* Strictly check for sample size */
 201         switch (params_format(params)) {
 202         case SNDRV_PCM_FORMAT_S16_LE:
 203                 break;
 204         default:
 205                 return -EINVAL;
 206         }
 207
 208         spin_lock_irqsave(&pcm->lock, flags);
 209
 210         /* Get hold of the PCMSOURCE_CLK */
 211         clkctl = readl(regs + S3C_PCM_CLKCTL);
 212         if (clkctl & S3C_PCM_CLKCTL_SERCLKSEL_PCLK)
 213                 clk = pcm->pclk;
 214         else
 215                 clk = pcm->cclk;
 216
 217         /* Set the SCLK divider */
 218         sclk_div = clk_get_rate(clk) / pcm->sclk_per_fs /
 219                                         params_rate(params) / 2 - 1;
 220
 221 #if defined(CONFIG_ARCH_S5PV310)
 222         if (clk_get_rate(clk) != (pcm->sclk_per_fs*params_rate(params)))
 223                 clk_set_rate(clk, pcm->sclk_per_fs*params_rate(params));
 224 #else
 225         clkctl &= ~(S3C_PCM_CLKCTL_SCLKDIV_MASK
 226                         << S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
 227         clkctl |= ((sclk_div & S3C_PCM_CLKCTL_SCLKDIV_MASK)
 228                         << S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
 229 #endif
 230
 231         /* Set the SYNC divider */
 232         sync_div = pcm->sclk_per_fs - 1;
 233
 234         clkctl &= ~(S3C_PCM_CLKCTL_SYNCDIV_MASK
 235                                 << S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
 236         clkctl |= ((sync_div & S3C_PCM_CLKCTL_SYNCDIV_MASK)
 237                                 << S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
 238
 239         writel(clkctl, regs + S3C_PCM_CLKCTL);
 240
 241         spin_unlock_irqrestore(&pcm->lock, flags);
 242
 243         dev_dbg(pcm->dev, "PCMSOURCE_CLK-%lu SCLK=%ufs SCLK_DIV=%d SYNC_DIV=%d\n",
 244                                 clk_get_rate(clk), pcm->sclk_per_fs,
 245                                 sclk_div, sync_div);
 246
 247         return 0;
 248 }
 249
 250 static int s3c_pcm_set_fmt(struct snd_soc_dai *cpu_dai,
 251                                unsigned int fmt)
 252 {
 253         struct s3c_pcm_info *pcm = to_info(cpu_dai);
 254         void __iomem *regs = pcm->regs;
 255         unsigned long flags;
 256         int ret = 0;
 257         u32 ctl;
 258
 259         dev_dbg(pcm->dev, "Entered %s\n", __func__);
 260
 261         spin_lock_irqsave(&pcm->lock, flags);
 262
 263         ctl = readl(regs + S3C_PCM_CTL);
 264
 265         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 266         case SND_SOC_DAIFMT_IB_NF:
 267                 /* Nothing to do, IB_NF by default */
 268                 break;
 269         default:
 270                 dev_err(pcm->dev, "Unsupported clock inversion!\n");
 271                 ret = -EINVAL;
 272                 goto exit;
 273         }
 274
 275         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 276         case SND_SOC_DAIFMT_CBS_CFS:
 277                 /* Nothing to do, Master by default */
 278                 break;
 279         default:
 280                 dev_err(pcm->dev, "Unsupported master/slave format!\n");
 281                 ret = -EINVAL;
 282                 goto exit;
 283         }
 284
 285         switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
 286         case SND_SOC_DAIFMT_CONT:
 287                 pcm->idleclk = 1;
 288                 break;
 289         case SND_SOC_DAIFMT_GATED:
 290                 pcm->idleclk = 0;
 291                 break;
 292         default:
 293                 dev_err(pcm->dev, "Invalid Clock gating request!\n");
 294                 ret = -EINVAL;
 295                 goto exit;
 296         }
 297
 298         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 299         case SND_SOC_DAIFMT_DSP_A:
 300                 ctl |= S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
 301                 ctl |= S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
 302                 break;
 303         case SND_SOC_DAIFMT_DSP_B:
 304                 ctl &= ~S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
 305                 ctl &= ~S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
 306                 break;
 307         default:
 308                 dev_err(pcm->dev, "Unsupported data format!\n");
 309                 ret = -EINVAL;
 310                 goto exit;
 311         }
 312
 313         writel(ctl, regs + S3C_PCM_CTL);
 314
 315 exit:
 316         spin_unlock_irqrestore(&pcm->lock, flags);
 317
 318         return ret;
 319 }
 320
 321 static int s3c_pcm_set_clkdiv(struct snd_soc_dai *cpu_dai,
 322                                                 int div_id, int div)
 323 {
 324         struct s3c_pcm_info *pcm = to_info(cpu_dai);
 325
 326         switch (div_id) {
 327         case S3C_PCM_SCLK_PER_FS:
 328                 pcm->sclk_per_fs = div;
 329                 break;
 330
 331         default:
 332                 return -EINVAL;
 333         }
 334
 335         return 0;
 336 }
 337
 338 static int s3c_pcm_set_sysclk(struct snd_soc_dai *cpu_dai,
 339                                   int clk_id, unsigned int freq, int dir)
 340 {
 341         struct s3c_pcm_info *pcm = to_info(cpu_dai);
 342         void __iomem *regs = pcm->regs;
 343         u32 clkctl = readl(regs + S3C_PCM_CLKCTL);
 344
 345         switch (clk_id) {
 346         case S3C_PCM_CLKSRC_PCLK:
 347                 clkctl |= S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
 348                 break;
 349
 350         case S3C_PCM_CLKSRC_MUX:
 351                 clkctl &= ~S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
 352
 353                 if (clk_get_rate(pcm->cclk) != freq)
 354                         clk_set_rate(pcm->cclk, freq);
 355
 356                 break;
 357
 358         default:
 359                 return -EINVAL;
 360         }
 361
 362         writel(clkctl, regs + S3C_PCM_CLKCTL);
 363
 364         return 0;
 365 }
 366
 367 static struct snd_soc_dai_ops s3c_pcm_dai_ops = {
 368         .set_sysclk     = s3c_pcm_set_sysclk,
 369         .set_clkdiv     = s3c_pcm_set_clkdiv,
 370         .trigger        = s3c_pcm_trigger,
 371         .hw_params      = s3c_pcm_hw_params,
 372         .set_fmt        = s3c_pcm_set_fmt,
 373 };
 374
 375 #ifdef CONFIG_PM
 376 static int s3c_pcm_suspend(struct snd_soc_dai *dai)
 377 {
 378         struct s3c_pcm_info *pcm = to_info(dai);
 379
 380         pcm->backup_pcmctl = readl(pcm->regs + S3C_PCM_CTL);
 381         pcm->backup_pcmclkctl = readl(pcm->regs + S3C_PCM_CLKCTL);
 382
 383         return 0;
 384 }
 385 static int s3c_pcm_resume(struct snd_soc_dai *dai)
 386 {
 387         struct s3c_pcm_info *pcm = to_info(dai);
 388
 389         writel(pcm->backup_pcmctl, pcm->regs + S3C_PCM_CTL);
 390         writel(pcm->backup_pcmclkctl, pcm->regs + S3C_PCM_CLKCTL);
 391
 392         return 0;
 393 }
 394 #else
 395 #define s3c_pcm_suspend NULL
 396 #define s3c_pcm_resume NULL
 397 #endif
 398
 399
 400 #define S3C_PCM_RATES  SNDRV_PCM_RATE_8000_96000
 401
 402 #define S3C_PCM_DECLARE(n)                      \
 403 {                                                               \
 404         .name            = "samsung-pcm",                       \
 405         .id              = (n),                         \
 406         .symmetric_rates = 1,                                   \
 407         .ops = &s3c_pcm_dai_ops,                                \
 408         .playback = {                                           \
 409                 .channels_min   = 2,                            \
 410                 .channels_max   = 2,                            \
 411                 .rates          = S3C_PCM_RATES,                \
 412                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,      \
 413         },                                                      \
 414         .capture = {                                            \
 415                 .channels_min   = 2,                            \
 416                 .channels_max   = 2,                            \
 417                 .rates          = S3C_PCM_RATES,                \
 418                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,      \
 419         },                                                      \
 420         .suspend = s3c_pcm_suspend,                             \
 421         .resume = s3c_pcm_resume,                               \
 422 }
 423
 424 struct snd_soc_dai s3c_pcm_dai[] = {
 425         S3C_PCM_DECLARE(0),
 426         S3C_PCM_DECLARE(1),
 427 };
 428 EXPORT_SYMBOL_GPL(s3c_pcm_dai);
 429
 430 static __devinit int s3c_pcm_dev_probe(struct platform_device *pdev)
 431 {
 432         struct s3c_pcm_info *pcm;
 433         struct snd_soc_dai *dai;
 434         struct resource *mem_res, *dmatx_res, *dmarx_res;
 435         struct s3c_audio_pdata *pcm_pdata;
 436         int ret;
 437
 438         /* Check for valid device index */
 439         if ((pdev->id < 0) || pdev->id >= ARRAY_SIZE(s3c_pcm)) {
 440                 dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
 441                 return -EINVAL;
 442         }
 443
 444         pcm_pdata = pdev->dev.platform_data;
 445
 446         /* Check for availability of necessary resource */
 447         dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 448         if (!dmatx_res) {
 449                 dev_err(&pdev->dev, "Unable to get PCM-TX dma resource\n");
 450                 return -ENXIO;
 451         }
 452
 453         dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 454         if (!dmarx_res) {
 455                 dev_err(&pdev->dev, "Unable to get PCM-RX dma resource\n");
 456                 return -ENXIO;
 457         }
 458
 459         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 460         if (!mem_res) {
 461                 dev_err(&pdev->dev, "Unable to get register resource\n");
 462                 return -ENXIO;
 463         }
 464
 465         if (pcm_pdata && pcm_pdata->cfg_gpio && pcm_pdata->cfg_gpio(pdev)) {
 466                 dev_err(&pdev->dev, "Unable to configure gpio\n");
 467                 return -EINVAL;
 468         }
 469
 470         pcm = &s3c_pcm[pdev->id];
 471         pcm->dev = &pdev->dev;
 472
 473         spin_lock_init(&pcm->lock);
 474
 475         dai = &s3c_pcm_dai[pdev->id];
 476         dai->dev = &pdev->dev;
 477
 478         /* Default is 128fs */
 479         pcm->sclk_per_fs = 128;
 480
 481 #if defined(CONFIG_ARCH_S5PV310)
 482         pcm->cclk = clk_get(&pdev->dev, "sclk_pcm");
 483 #else
 484         pcm->cclk = clk_get(&pdev->dev, "audio-bus");
 485 #endif
 486         if (IS_ERR(pcm->cclk)) {
 487                 dev_err(&pdev->dev, "failed to get audio-bus\n");
 488                 ret = PTR_ERR(pcm->cclk);
 489                 goto err1;
 490         }
 491         clk_enable(pcm->cclk);
 492
 493         /* record our pcm structure for later use in the callbacks */
 494         dai->private_data = pcm;
 495
 496         if (!request_mem_region(mem_res->start,
 497                                 resource_size(mem_res), "samsung-pcm")) {
 498                 dev_err(&pdev->dev, "Unable to request register region\n");
 499                 ret = -EBUSY;
 500                 goto err2;
 501         }
 502
 503         pcm->regs = ioremap(mem_res->start, 0x100);
 504         if (pcm->regs == NULL) {
 505                 dev_err(&pdev->dev, "cannot ioremap registers\n");
 506                 ret = -ENXIO;
 507                 goto err3;
 508         }
 509
 510         pcm->pclk = clk_get(&pdev->dev, "pcm");
 511         if (IS_ERR(pcm->pclk)) {
 512                 dev_err(&pdev->dev, "failed to get pcm_clock\n");
 513                 ret = -ENOENT;
 514                 goto err4;
 515         }
 516         clk_enable(pcm->pclk);
 517
 518         ret = snd_soc_register_dai(dai);
 519         if (ret != 0) {
 520                 dev_err(&pdev->dev, "failed to get pcm_clock\n");
 521                 goto err5;
 522         }
 523
 524         s3c_pcm_stereo_in[pdev->id].dma_addr = mem_res->start
 525                                                         + S3C_PCM_RXFIFO;
 526         s3c_pcm_stereo_out[pdev->id].dma_addr = mem_res->start
 527                                                         + S3C_PCM_TXFIFO;
 528
 529         s3c_pcm_stereo_in[pdev->id].channel = dmarx_res->start;
 530         s3c_pcm_stereo_out[pdev->id].channel = dmatx_res->start;
 531
 532         pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id];
 533         pcm->dma_playback = &s3c_pcm_stereo_out[pdev->id];
 534
 535         return 0;
 536
 537 err5:
 538         clk_disable(pcm->pclk);
 539         clk_put(pcm->pclk);
 540 err4:
 541         iounmap(pcm->regs);
 542 err3:
 543         release_mem_region(mem_res->start, resource_size(mem_res));
 544 err2:
 545         clk_disable(pcm->cclk);
 546         clk_put(pcm->cclk);
 547 err1:
 548         return ret;
 549 }
 550
 551 static __devexit int s3c_pcm_dev_remove(struct platform_device *pdev)
 552 {
 553         struct s3c_pcm_info *pcm = &s3c_pcm[pdev->id];
 554         struct resource *mem_res;
 555
 556         iounmap(pcm->regs);
 557
 558         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 559         release_mem_region(mem_res->start, resource_size(mem_res));
 560
 561         clk_disable(pcm->cclk);
 562         clk_disable(pcm->pclk);
 563         clk_put(pcm->pclk);
 564         clk_put(pcm->cclk);
 565
 566         return 0;
 567 }
 568
 569 static struct platform_driver s3c_pcm_driver = {
 570         .probe  = s3c_pcm_dev_probe,
 571         .remove = s3c_pcm_dev_remove,
 572         .driver = {
 573                 .name = "samsung-pcm",
 574                 .owner = THIS_MODULE,
 575         },
 576 };
 577
 578 static int __init s3c_pcm_init(void)
 579 {
 580         return platform_driver_register(&s3c_pcm_driver);
 581 }
 582 module_init(s3c_pcm_init);
 583
 584 static void __exit s3c_pcm_exit(void)
 585 {
 586         platform_driver_unregister(&s3c_pcm_driver);
 587 }
 588 module_exit(s3c_pcm_exit);
 589
 590 /* Module information */
 591 MODULE_AUTHOR("Jaswinder Singh, <jassi.brar@samsung.com>");
 592 MODULE_DESCRIPTION("S3C PCM Controller Driver");
 593 MODULE_LICENSE("GPL");