sound/soc/samsung/spdif.c

   1 /* sound/soc/samsung/spdif.c
   2  *
   3  * ALSA SoC Audio Layer - Samsung S/PDIF Controller driver
   4  *
   5  * Copyright (c) 2010 Samsung Electronics Co. Ltd
   6  *              http://www.samsung.com/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/clk.h>
  14 #include <linux/io.h>
  15 #include <linux/module.h>
  16
  17 #include <sound/soc.h>
  18 #include <sound/pcm_params.h>
  19
  20 #include <linux/platform_data/asoc-s3c.h>
  21 #include <mach/dma.h>
  22
  23 #include "dma.h"
  24 #include "spdif.h"
  25
  26 /* Registers */
  27 #define CLKCON                          0x00
  28 #define CON                             0x04
  29 #define BSTAS                           0x08
  30 #define CSTAS                           0x0C
  31 #define DATA_OUTBUF                     0x10
  32 #define DCNT                            0x14
  33 #define BSTAS_S                         0x18
  34 #define DCNT_S                          0x1C
  35
  36 #define CLKCTL_MASK                     0x7
  37 #define CLKCTL_MCLK_EXT                 (0x1 << 2)
  38 #define CLKCTL_PWR_ON                   (0x1 << 0)
  39
  40 #define CON_MASK                        0x3ffffff
  41 #define CON_FIFO_TH_SHIFT               19
  42 #define CON_FIFO_TH_MASK                (0x7 << 19)
  43 #define CON_USERDATA_23RDBIT            (0x1 << 12)
  44
  45 #define CON_SW_RESET                    (0x1 << 5)
  46
  47 #define CON_MCLKDIV_MASK                (0x3 << 3)
  48 #define CON_MCLKDIV_256FS               (0x0 << 3)
  49 #define CON_MCLKDIV_384FS               (0x1 << 3)
  50 #define CON_MCLKDIV_512FS               (0x2 << 3)
  51
  52 #define CON_PCM_MASK                    (0x3 << 1)
  53 #define CON_PCM_16BIT                   (0x0 << 1)
  54 #define CON_PCM_20BIT                   (0x1 << 1)
  55 #define CON_PCM_24BIT                   (0x2 << 1)
  56
  57 #define CON_PCM_DATA                    (0x1 << 0)
  58
  59 #define CSTAS_MASK                      0x3fffffff
  60 #define CSTAS_SAMP_FREQ_MASK            (0xF << 24)
  61 #define CSTAS_SAMP_FREQ_44              (0x0 << 24)
  62 #define CSTAS_SAMP_FREQ_48              (0x2 << 24)
  63 #define CSTAS_SAMP_FREQ_32              (0x3 << 24)
  64 #define CSTAS_SAMP_FREQ_96              (0xA << 24)
  65
  66 #define CSTAS_CATEGORY_MASK             (0xFF << 8)
  67 #define CSTAS_CATEGORY_CODE_CDP         (0x01 << 8)
  68
  69 #define CSTAS_NO_COPYRIGHT              (0x1 << 2)
  70
  71 /**
  72  * struct samsung_spdif_info - Samsung S/PDIF Controller information
  73  * @lock: Spin lock for S/PDIF.
  74  * @dev: The parent device passed to use from the probe.
  75  * @regs: The pointer to the device register block.
  76  * @clk_rate: Current clock rate for calcurate ratio.
  77  * @pclk: The peri-clock pointer for spdif master operation.
  78  * @sclk: The source clock pointer for making sync signals.
  79  * @save_clkcon: Backup clkcon reg. in suspend.
  80  * @save_con: Backup con reg. in suspend.
  81  * @save_cstas: Backup cstas reg. in suspend.
  82  * @dma_playback: DMA information for playback channel.
  83  */
  84 struct samsung_spdif_info {
  85         spinlock_t      lock;
  86         struct device   *dev;
  87         void __iomem    *regs;
  88         unsigned long   clk_rate;
  89         struct clk      *pclk;
  90         struct clk      *sclk;
  91         u32             saved_clkcon;
  92         u32             saved_con;
  93         u32             saved_cstas;
  94         struct s3c_dma_params   *dma_playback;
  95 };
  96
  97 static struct s3c2410_dma_client spdif_dma_client_out = {
  98         .name           = "S/PDIF Stereo out",
  99 };
 100
 101 static struct s3c_dma_params spdif_stereo_out;
 102 static struct samsung_spdif_info spdif_info;
 103
 104 static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai)
 105 {
 106         return snd_soc_dai_get_drvdata(cpu_dai);
 107 }
 108
 109 static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on)
 110 {
 111         void __iomem *regs = spdif->regs;
 112         u32 clkcon;
 113
 114         dev_dbg(spdif->dev, "Entered %s\n", __func__);
 115
 116         clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
 117         if (on)
 118                 writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON);
 119         else
 120                 writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
 121 }
 122
 123 static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai,
 124                                 int clk_id, unsigned int freq, int dir)
 125 {
 126         struct samsung_spdif_info *spdif = to_info(cpu_dai);
 127         u32 clkcon;
 128
 129         dev_dbg(spdif->dev, "Entered %s\n", __func__);
 130
 131         clkcon = readl(spdif->regs + CLKCON);
 132
 133         if (clk_id == SND_SOC_SPDIF_INT_MCLK)
 134                 clkcon &= ~CLKCTL_MCLK_EXT;
 135         else
 136                 clkcon |= CLKCTL_MCLK_EXT;
 137
 138         writel(clkcon, spdif->regs + CLKCON);
 139
 140         spdif->clk_rate = freq;
 141
 142         return 0;
 143 }
 144
 145 static int spdif_trigger(struct snd_pcm_substream *substream, int cmd,
 146                                 struct snd_soc_dai *dai)
 147 {
 148         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 149         struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
 150         unsigned long flags;
 151
 152         dev_dbg(spdif->dev, "Entered %s\n", __func__);
 153
 154         switch (cmd) {
 155         case SNDRV_PCM_TRIGGER_START:
 156         case SNDRV_PCM_TRIGGER_RESUME:
 157         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 158                 spin_lock_irqsave(&spdif->lock, flags);
 159                 spdif_snd_txctrl(spdif, 1);
 160                 spin_unlock_irqrestore(&spdif->lock, flags);
 161                 break;
 162         case SNDRV_PCM_TRIGGER_STOP:
 163         case SNDRV_PCM_TRIGGER_SUSPEND:
 164         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 165                 spin_lock_irqsave(&spdif->lock, flags);
 166                 spdif_snd_txctrl(spdif, 0);
 167                 spin_unlock_irqrestore(&spdif->lock, flags);
 168                 break;
 169         default:
 170                 return -EINVAL;
 171         }
 172
 173         return 0;
 174 }
 175
 176 static int spdif_sysclk_ratios[] = {
 177         512, 384, 256,
 178 };
 179
 180 static int spdif_hw_params(struct snd_pcm_substream *substream,
 181                                 struct snd_pcm_hw_params *params,
 182                                 struct snd_soc_dai *socdai)
 183 {
 184         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 185         struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
 186         void __iomem *regs = spdif->regs;
 187         struct s3c_dma_params *dma_data;
 188         u32 con, clkcon, cstas;
 189         unsigned long flags;
 190         int i, ratio;
 191
 192         dev_dbg(spdif->dev, "Entered %s\n", __func__);
 193
 194         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 195                 dma_data = spdif->dma_playback;
 196         else {
 197                 dev_err(spdif->dev, "Capture is not supported\n");
 198                 return -EINVAL;
 199         }
 200
 201         snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
 202
 203         spin_lock_irqsave(&spdif->lock, flags);
 204
 205         con = readl(regs + CON) & CON_MASK;
 206         cstas = readl(regs + CSTAS) & CSTAS_MASK;
 207         clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
 208
 209         con &= ~CON_FIFO_TH_MASK;
 210         con |= (0x7 << CON_FIFO_TH_SHIFT);
 211         con |= CON_USERDATA_23RDBIT;
 212         con |= CON_PCM_DATA;
 213
 214         con &= ~CON_PCM_MASK;
 215         switch (params_format(params)) {
 216         case SNDRV_PCM_FORMAT_S16_LE:
 217                 con |= CON_PCM_16BIT;
 218                 break;
 219         default:
 220                 dev_err(spdif->dev, "Unsupported data size.\n");
 221                 goto err;
 222         }
 223
 224         ratio = spdif->clk_rate / params_rate(params);
 225         for (i = 0; i < ARRAY_SIZE(spdif_sysclk_ratios); i++)
 226                 if (ratio == spdif_sysclk_ratios[i])
 227                         break;
 228         if (i == ARRAY_SIZE(spdif_sysclk_ratios)) {
 229                 dev_err(spdif->dev, "Invalid clock ratio %ld/%d\n",
 230                                 spdif->clk_rate, params_rate(params));
 231                 goto err;
 232         }
 233
 234         con &= ~CON_MCLKDIV_MASK;
 235         switch (ratio) {
 236         case 256:
 237                 con |= CON_MCLKDIV_256FS;
 238                 break;
 239         case 384:
 240                 con |= CON_MCLKDIV_384FS;
 241                 break;
 242         case 512:
 243                 con |= CON_MCLKDIV_512FS;
 244                 break;
 245         }
 246
 247         cstas &= ~CSTAS_SAMP_FREQ_MASK;
 248         switch (params_rate(params)) {
 249         case 44100:
 250                 cstas |= CSTAS_SAMP_FREQ_44;
 251                 break;
 252         case 48000:
 253                 cstas |= CSTAS_SAMP_FREQ_48;
 254                 break;
 255         case 32000:
 256                 cstas |= CSTAS_SAMP_FREQ_32;
 257                 break;
 258         case 96000:
 259                 cstas |= CSTAS_SAMP_FREQ_96;
 260                 break;
 261         default:
 262                 dev_err(spdif->dev, "Invalid sampling rate %d\n",
 263                                 params_rate(params));
 264                 goto err;
 265         }
 266
 267         cstas &= ~CSTAS_CATEGORY_MASK;
 268         cstas |= CSTAS_CATEGORY_CODE_CDP;
 269         cstas |= CSTAS_NO_COPYRIGHT;
 270
 271         writel(con, regs + CON);
 272         writel(cstas, regs + CSTAS);
 273         writel(clkcon, regs + CLKCON);
 274
 275         spin_unlock_irqrestore(&spdif->lock, flags);
 276
 277         return 0;
 278 err:
 279         spin_unlock_irqrestore(&spdif->lock, flags);
 280         return -EINVAL;
 281 }
 282
 283 static void spdif_shutdown(struct snd_pcm_substream *substream,
 284                                 struct snd_soc_dai *dai)
 285 {
 286         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 287         struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
 288         void __iomem *regs = spdif->regs;
 289         u32 con, clkcon;
 290
 291         dev_dbg(spdif->dev, "Entered %s\n", __func__);
 292
 293         con = readl(regs + CON) & CON_MASK;
 294         clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
 295
 296         writel(con | CON_SW_RESET, regs + CON);
 297         cpu_relax();
 298
 299         writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
 300 }
 301
 302 #ifdef CONFIG_PM
 303 static int spdif_suspend(struct snd_soc_dai *cpu_dai)
 304 {
 305         struct samsung_spdif_info *spdif = to_info(cpu_dai);
 306         u32 con = spdif->saved_con;
 307
 308         dev_dbg(spdif->dev, "Entered %s\n", __func__);
 309
 310         spdif->saved_clkcon = readl(spdif->regs + CLKCON) & CLKCTL_MASK;
 311         spdif->saved_con = readl(spdif->regs + CON) & CON_MASK;
 312         spdif->saved_cstas = readl(spdif->regs + CSTAS) & CSTAS_MASK;
 313
 314         writel(con | CON_SW_RESET, spdif->regs + CON);
 315         cpu_relax();
 316
 317         return 0;
 318 }
 319
 320 static int spdif_resume(struct snd_soc_dai *cpu_dai)
 321 {
 322         struct samsung_spdif_info *spdif = to_info(cpu_dai);
 323
 324         dev_dbg(spdif->dev, "Entered %s\n", __func__);
 325
 326         writel(spdif->saved_clkcon, spdif->regs + CLKCON);
 327         writel(spdif->saved_con, spdif->regs + CON);
 328         writel(spdif->saved_cstas, spdif->regs + CSTAS);
 329
 330         return 0;
 331 }
 332 #else
 333 #define spdif_suspend NULL
 334 #define spdif_resume NULL
 335 #endif
 336
 337 static const struct snd_soc_dai_ops spdif_dai_ops = {
 338         .set_sysclk     = spdif_set_sysclk,
 339         .trigger        = spdif_trigger,
 340         .hw_params      = spdif_hw_params,
 341         .shutdown       = spdif_shutdown,
 342 };
 343
 344 static struct snd_soc_dai_driver samsung_spdif_dai = {
 345         .name = "samsung-spdif",
 346         .playback = {
 347                 .stream_name = "S/PDIF Playback",
 348                 .channels_min = 2,
 349                 .channels_max = 2,
 350                 .rates = (SNDRV_PCM_RATE_32000 |
 351                                 SNDRV_PCM_RATE_44100 |
 352                                 SNDRV_PCM_RATE_48000 |
 353                                 SNDRV_PCM_RATE_96000),
 354                 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
 355         .ops = &spdif_dai_ops,
 356         .suspend = spdif_suspend,
 357         .resume = spdif_resume,
 358 };
 359
 360 static int spdif_probe(struct platform_device *pdev)
 361 {
 362         struct s3c_audio_pdata *spdif_pdata;
 363         struct resource *mem_res, *dma_res;
 364         struct samsung_spdif_info *spdif;
 365         int ret;
 366
 367         spdif_pdata = pdev->dev.platform_data;
 368
 369         dev_dbg(&pdev->dev, "Entered %s\n", __func__);
 370
 371         dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 372         if (!dma_res) {
 373                 dev_err(&pdev->dev, "Unable to get dma resource.\n");
 374                 return -ENXIO;
 375         }
 376
 377         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 378         if (!mem_res) {
 379                 dev_err(&pdev->dev, "Unable to get register resource.\n");
 380                 return -ENXIO;
 381         }
 382
 383         if (spdif_pdata && spdif_pdata->cfg_gpio
 384                         && spdif_pdata->cfg_gpio(pdev)) {
 385                 dev_err(&pdev->dev, "Unable to configure GPIO pins\n");
 386                 return -EINVAL;
 387         }
 388
 389         spdif = &spdif_info;
 390         spdif->dev = &pdev->dev;
 391
 392         spin_lock_init(&spdif->lock);
 393
 394         spdif->pclk = clk_get(&pdev->dev, "spdif");
 395         if (IS_ERR(spdif->pclk)) {
 396                 dev_err(&pdev->dev, "failed to get peri-clock\n");
 397                 ret = -ENOENT;
 398                 goto err0;
 399         }
 400         clk_prepare_enable(spdif->pclk);
 401
 402         spdif->sclk = clk_get(&pdev->dev, "sclk_spdif");
 403         if (IS_ERR(spdif->sclk)) {
 404                 dev_err(&pdev->dev, "failed to get internal source clock\n");
 405                 ret = -ENOENT;
 406                 goto err1;
 407         }
 408         clk_prepare_enable(spdif->sclk);
 409
 410         /* Request S/PDIF Register's memory region */
 411         if (!request_mem_region(mem_res->start,
 412                                 resource_size(mem_res), "samsung-spdif")) {
 413                 dev_err(&pdev->dev, "Unable to request register region\n");
 414                 ret = -EBUSY;
 415                 goto err2;
 416         }
 417
 418         spdif->regs = ioremap(mem_res->start, 0x100);
 419         if (spdif->regs == NULL) {
 420                 dev_err(&pdev->dev, "Cannot ioremap registers\n");
 421                 ret = -ENXIO;
 422                 goto err3;
 423         }
 424
 425         dev_set_drvdata(&pdev->dev, spdif);
 426
 427         ret = snd_soc_register_dai(&pdev->dev, &samsung_spdif_dai);
 428         if (ret != 0) {
 429                 dev_err(&pdev->dev, "fail to register dai\n");
 430                 goto err4;
 431         }
 432
 433         spdif_stereo_out.dma_size = 2;
 434         spdif_stereo_out.client = &spdif_dma_client_out;
 435         spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF;
 436         spdif_stereo_out.channel = dma_res->start;
 437
 438         spdif->dma_playback = &spdif_stereo_out;
 439
 440         ret = asoc_dma_platform_register(&pdev->dev);
 441         if (ret) {
 442                 dev_err(&pdev->dev, "failed to register DMA: %d\n", ret);
 443                 goto err5;
 444         }
 445
 446         return 0;
 447 err5:
 448         snd_soc_unregister_dai(&pdev->dev);
 449 err4:
 450         iounmap(spdif->regs);
 451 err3:
 452         release_mem_region(mem_res->start, resource_size(mem_res));
 453 err2:
 454         clk_disable_unprepare(spdif->sclk);
 455         clk_put(spdif->sclk);
 456 err1:
 457         clk_disable_unprepare(spdif->pclk);
 458         clk_put(spdif->pclk);
 459 err0:
 460         return ret;
 461 }
 462
 463 static int spdif_remove(struct platform_device *pdev)
 464 {
 465         struct samsung_spdif_info *spdif = &spdif_info;
 466         struct resource *mem_res;
 467
 468         asoc_dma_platform_unregister(&pdev->dev);
 469         snd_soc_unregister_dai(&pdev->dev);
 470
 471         iounmap(spdif->regs);
 472
 473         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 474         if (mem_res)
 475                 release_mem_region(mem_res->start, resource_size(mem_res));
 476
 477         clk_disable_unprepare(spdif->sclk);
 478         clk_put(spdif->sclk);
 479         clk_disable_unprepare(spdif->pclk);
 480         clk_put(spdif->pclk);
 481
 482         return 0;
 483 }
 484
 485 static struct platform_driver samsung_spdif_driver = {
 486         .probe  = spdif_probe,
 487         .remove = spdif_remove,
 488         .driver = {
 489                 .name   = "samsung-spdif",
 490                 .owner  = THIS_MODULE,
 491         },
 492 };
 493
 494 module_platform_driver(samsung_spdif_driver);
 495
 496 MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
 497 MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver");
 498 MODULE_LICENSE("GPL");
 499 MODULE_ALIAS("platform:samsung-spdif");