1 /* sound/soc/samsung/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/clk.h> 15 #include <linux/io.h> 16 17 #include <sound/soc.h> 18 #include <sound/pcm_params.h> 19 20 #include <plat/audio.h> 21 #include <plat/dma.h> 22 23 #include "dma.h" 24 #include "pcm.h" 25 26 /*Register Offsets */ 27 #define S3C_PCM_CTL 0x00 28 #define S3C_PCM_CLKCTL 0x04 29 #define S3C_PCM_TXFIFO 0x08 30 #define S3C_PCM_RXFIFO 0x0C 31 #define S3C_PCM_IRQCTL 0x10 32 #define S3C_PCM_IRQSTAT 0x14 33 #define S3C_PCM_FIFOSTAT 0x18 34 #define S3C_PCM_CLRINT 0x20 35 36 /* PCM_CTL Bit-Fields */ 37 #define S3C_PCM_CTL_TXDIPSTICK_MASK 0x3f 38 #define S3C_PCM_CTL_TXDIPSTICK_SHIFT 13 39 #define S3C_PCM_CTL_RXDIPSTICK_MASK 0x3f 40 #define S3C_PCM_CTL_RXDIPSTICK_SHIFT 7 41 #define S3C_PCM_CTL_TXDMA_EN (0x1 << 6) 42 #define S3C_PCM_CTL_RXDMA_EN (0x1 << 5) 43 #define S3C_PCM_CTL_TXMSB_AFTER_FSYNC (0x1 << 4) 44 #define S3C_PCM_CTL_RXMSB_AFTER_FSYNC (0x1 << 3) 45 #define S3C_PCM_CTL_TXFIFO_EN (0x1 << 2) 46 #define S3C_PCM_CTL_RXFIFO_EN (0x1 << 1) 47 #define S3C_PCM_CTL_ENABLE (0x1 << 0) 48 49 /* PCM_CLKCTL Bit-Fields */ 50 #define S3C_PCM_CLKCTL_SERCLK_EN (0x1 << 19) 51 #define S3C_PCM_CLKCTL_SERCLKSEL_PCLK (0x1 << 18) 52 #define S3C_PCM_CLKCTL_SCLKDIV_MASK 0x1ff 53 #define S3C_PCM_CLKCTL_SYNCDIV_MASK 0x1ff 54 #define S3C_PCM_CLKCTL_SCLKDIV_SHIFT 9 55 #define S3C_PCM_CLKCTL_SYNCDIV_SHIFT 0 56 57 /* PCM_TXFIFO Bit-Fields */ 58 #define S3C_PCM_TXFIFO_DVALID (0x1 << 16) 59 #define S3C_PCM_TXFIFO_DATA_MSK (0xffff << 0) 60 61 /* PCM_RXFIFO Bit-Fields */ 62 #define S3C_PCM_RXFIFO_DVALID (0x1 << 16) 63 #define S3C_PCM_RXFIFO_DATA_MSK (0xffff << 0) 64 65 /* PCM_IRQCTL Bit-Fields */ 66 #define S3C_PCM_IRQCTL_IRQEN (0x1 << 14) 67 #define S3C_PCM_IRQCTL_WRDEN (0x1 << 12) 68 #define S3C_PCM_IRQCTL_TXEMPTYEN (0x1 << 11) 69 #define S3C_PCM_IRQCTL_TXALMSTEMPTYEN (0x1 << 10) 70 #define S3C_PCM_IRQCTL_TXFULLEN (0x1 << 9) 71 #define S3C_PCM_IRQCTL_TXALMSTFULLEN (0x1 << 8) 72 #define S3C_PCM_IRQCTL_TXSTARVEN (0x1 << 7) 73 #define S3C_PCM_IRQCTL_TXERROVRFLEN (0x1 << 6) 74 #define S3C_PCM_IRQCTL_RXEMPTEN (0x1 << 5) 75 #define S3C_PCM_IRQCTL_RXALMSTEMPTEN (0x1 << 4) 76 #define S3C_PCM_IRQCTL_RXFULLEN (0x1 << 3) 77 #define S3C_PCM_IRQCTL_RXALMSTFULLEN (0x1 << 2) 78 #define S3C_PCM_IRQCTL_RXSTARVEN (0x1 << 1) 79 #define S3C_PCM_IRQCTL_RXERROVRFLEN (0x1 << 0) 80 81 /* PCM_IRQSTAT Bit-Fields */ 82 #define S3C_PCM_IRQSTAT_IRQPND (0x1 << 13) 83 #define S3C_PCM_IRQSTAT_WRD_XFER (0x1 << 12) 84 #define S3C_PCM_IRQSTAT_TXEMPTY (0x1 << 11) 85 #define S3C_PCM_IRQSTAT_TXALMSTEMPTY (0x1 << 10) 86 #define S3C_PCM_IRQSTAT_TXFULL (0x1 << 9) 87 #define S3C_PCM_IRQSTAT_TXALMSTFULL (0x1 << 8) 88 #define S3C_PCM_IRQSTAT_TXSTARV (0x1 << 7) 89 #define S3C_PCM_IRQSTAT_TXERROVRFL (0x1 << 6) 90 #define S3C_PCM_IRQSTAT_RXEMPT (0x1 << 5) 91 #define S3C_PCM_IRQSTAT_RXALMSTEMPT (0x1 << 4) 92 #define S3C_PCM_IRQSTAT_RXFULL (0x1 << 3) 93 #define S3C_PCM_IRQSTAT_RXALMSTFULL (0x1 << 2) 94 #define S3C_PCM_IRQSTAT_RXSTARV (0x1 << 1) 95 #define S3C_PCM_IRQSTAT_RXERROVRFL (0x1 << 0) 96 97 /* PCM_FIFOSTAT Bit-Fields */ 98 #define S3C_PCM_FIFOSTAT_TXCNT_MSK (0x3f << 14) 99 #define S3C_PCM_FIFOSTAT_TXFIFOEMPTY (0x1 << 13) 100 #define S3C_PCM_FIFOSTAT_TXFIFOALMSTEMPTY (0x1 << 12) 101 #define S3C_PCM_FIFOSTAT_TXFIFOFULL (0x1 << 11) 102 #define S3C_PCM_FIFOSTAT_TXFIFOALMSTFULL (0x1 << 10) 103 #define S3C_PCM_FIFOSTAT_RXCNT_MSK (0x3f << 4) 104 #define S3C_PCM_FIFOSTAT_RXFIFOEMPTY (0x1 << 3) 105 #define S3C_PCM_FIFOSTAT_RXFIFOALMSTEMPTY (0x1 << 2) 106 #define S3C_PCM_FIFOSTAT_RXFIFOFULL (0x1 << 1) 107 #define S3C_PCM_FIFOSTAT_RXFIFOALMSTFULL (0x1 << 0) 108 109 /** 110 * struct s3c_pcm_info - S3C PCM Controller information 111 * @dev: The parent device passed to use from the probe. 112 * @regs: The pointer to the device register block. 113 * @dma_playback: DMA information for playback channel. 114 * @dma_capture: DMA information for capture channel. 115 */ 116 struct s3c_pcm_info { 117 spinlock_t lock; 118 struct device *dev; 119 void __iomem *regs; 120 121 unsigned int sclk_per_fs; 122 123 /* Whether to keep PCMSCLK enabled even when idle(no active xfer) */ 124 unsigned int idleclk; 125 126 struct clk *pclk; 127 struct clk *cclk; 128 129 struct s3c_dma_params *dma_playback; 130 struct s3c_dma_params *dma_capture; 131 }; 132 133 static struct s3c2410_dma_client s3c_pcm_dma_client_out = { 134 .name = "PCM Stereo out" 135 }; 136 137 static struct s3c2410_dma_client s3c_pcm_dma_client_in = { 138 .name = "PCM Stereo in" 139 }; 140 141 static struct s3c_dma_params s3c_pcm_stereo_out[] = { 142 [0] = { 143 .client = &s3c_pcm_dma_client_out, 144 .dma_size = 4, 145 }, 146 [1] = { 147 .client = &s3c_pcm_dma_client_out, 148 .dma_size = 4, 149 }, 150 }; 151 152 static struct s3c_dma_params s3c_pcm_stereo_in[] = { 153 [0] = { 154 .client = &s3c_pcm_dma_client_in, 155 .dma_size = 4, 156 }, 157 [1] = { 158 .client = &s3c_pcm_dma_client_in, 159 .dma_size = 4, 160 }, 161 }; 162 163 static struct s3c_pcm_info s3c_pcm[2]; 164 165 static void s3c_pcm_snd_txctrl(struct s3c_pcm_info *pcm, int on) 166 { 167 void __iomem *regs = pcm->regs; 168 u32 ctl, clkctl; 169 170 clkctl = readl(regs + S3C_PCM_CLKCTL); 171 ctl = readl(regs + S3C_PCM_CTL); 172 ctl &= ~(S3C_PCM_CTL_TXDIPSTICK_MASK 173 << S3C_PCM_CTL_TXDIPSTICK_SHIFT); 174 175 if (on) { 176 ctl |= S3C_PCM_CTL_TXDMA_EN; 177 ctl |= S3C_PCM_CTL_TXFIFO_EN; 178 ctl |= S3C_PCM_CTL_ENABLE; 179 ctl |= (0x4<<S3C_PCM_CTL_TXDIPSTICK_SHIFT); 180 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN; 181 } else { 182 ctl &= ~S3C_PCM_CTL_TXDMA_EN; 183 ctl &= ~S3C_PCM_CTL_TXFIFO_EN; 184 185 if (!(ctl & S3C_PCM_CTL_RXFIFO_EN)) { 186 ctl &= ~S3C_PCM_CTL_ENABLE; 187 if (!pcm->idleclk) 188 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN; 189 } 190 } 191 192 writel(clkctl, regs + S3C_PCM_CLKCTL); 193 writel(ctl, regs + S3C_PCM_CTL); 194 } 195 196 static void s3c_pcm_snd_rxctrl(struct s3c_pcm_info *pcm, int on) 197 { 198 void __iomem *regs = pcm->regs; 199 u32 ctl, clkctl; 200 201 ctl = readl(regs + S3C_PCM_CTL); 202 clkctl = readl(regs + S3C_PCM_CLKCTL); 203 ctl &= ~(S3C_PCM_CTL_RXDIPSTICK_MASK 204 << S3C_PCM_CTL_RXDIPSTICK_SHIFT); 205 206 if (on) { 207 ctl |= S3C_PCM_CTL_RXDMA_EN; 208 ctl |= S3C_PCM_CTL_RXFIFO_EN; 209 ctl |= S3C_PCM_CTL_ENABLE; 210 ctl |= (0x20<<S3C_PCM_CTL_RXDIPSTICK_SHIFT); 211 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN; 212 } else { 213 ctl &= ~S3C_PCM_CTL_RXDMA_EN; 214 ctl &= ~S3C_PCM_CTL_RXFIFO_EN; 215 216 if (!(ctl & S3C_PCM_CTL_TXFIFO_EN)) { 217 ctl &= ~S3C_PCM_CTL_ENABLE; 218 if (!pcm->idleclk) 219 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN; 220 } 221 } 222 223 writel(clkctl, regs + S3C_PCM_CLKCTL); 224 writel(ctl, regs + S3C_PCM_CTL); 225 } 226 227 static int s3c_pcm_trigger(struct snd_pcm_substream *substream, int cmd, 228 struct snd_soc_dai *dai) 229 { 230 struct snd_soc_pcm_runtime *rtd = substream->private_data; 231 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->cpu_dai); 232 unsigned long flags; 233 234 dev_dbg(pcm->dev, "Entered %s\n", __func__); 235 236 switch (cmd) { 237 case SNDRV_PCM_TRIGGER_START: 238 case SNDRV_PCM_TRIGGER_RESUME: 239 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 240 spin_lock_irqsave(&pcm->lock, flags); 241 242 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 243 s3c_pcm_snd_rxctrl(pcm, 1); 244 else 245 s3c_pcm_snd_txctrl(pcm, 1); 246 247 spin_unlock_irqrestore(&pcm->lock, flags); 248 break; 249 250 case SNDRV_PCM_TRIGGER_STOP: 251 case SNDRV_PCM_TRIGGER_SUSPEND: 252 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 253 spin_lock_irqsave(&pcm->lock, flags); 254 255 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 256 s3c_pcm_snd_rxctrl(pcm, 0); 257 else 258 s3c_pcm_snd_txctrl(pcm, 0); 259 260 spin_unlock_irqrestore(&pcm->lock, flags); 261 break; 262 263 default: 264 return -EINVAL; 265 } 266 267 return 0; 268 } 269 270 static int s3c_pcm_hw_params(struct snd_pcm_substream *substream, 271 struct snd_pcm_hw_params *params, 272 struct snd_soc_dai *socdai) 273 { 274 struct snd_soc_pcm_runtime *rtd = substream->private_data; 275 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->cpu_dai); 276 struct s3c_dma_params *dma_data; 277 void __iomem *regs = pcm->regs; 278 struct clk *clk; 279 int sclk_div, sync_div; 280 unsigned long flags; 281 u32 clkctl; 282 283 dev_dbg(pcm->dev, "Entered %s\n", __func__); 284 285 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 286 dma_data = pcm->dma_playback; 287 else 288 dma_data = pcm->dma_capture; 289 290 snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data); 291 292 /* Strictly check for sample size */ 293 switch (params_format(params)) { 294 case SNDRV_PCM_FORMAT_S16_LE: 295 break; 296 default: 297 return -EINVAL; 298 } 299 300 spin_lock_irqsave(&pcm->lock, flags); 301 302 /* Get hold of the PCMSOURCE_CLK */ 303 clkctl = readl(regs + S3C_PCM_CLKCTL); 304 if (clkctl & S3C_PCM_CLKCTL_SERCLKSEL_PCLK) 305 clk = pcm->pclk; 306 else 307 clk = pcm->cclk; 308 309 /* Set the SCLK divider */ 310 sclk_div = clk_get_rate(clk) / pcm->sclk_per_fs / 311 params_rate(params) / 2 - 1; 312 313 clkctl &= ~(S3C_PCM_CLKCTL_SCLKDIV_MASK 314 << S3C_PCM_CLKCTL_SCLKDIV_SHIFT); 315 clkctl |= ((sclk_div & S3C_PCM_CLKCTL_SCLKDIV_MASK) 316 << S3C_PCM_CLKCTL_SCLKDIV_SHIFT); 317 318 /* Set the SYNC divider */ 319 sync_div = pcm->sclk_per_fs - 1; 320 321 clkctl &= ~(S3C_PCM_CLKCTL_SYNCDIV_MASK 322 << S3C_PCM_CLKCTL_SYNCDIV_SHIFT); 323 clkctl |= ((sync_div & S3C_PCM_CLKCTL_SYNCDIV_MASK) 324 << S3C_PCM_CLKCTL_SYNCDIV_SHIFT); 325 326 writel(clkctl, regs + S3C_PCM_CLKCTL); 327 328 spin_unlock_irqrestore(&pcm->lock, flags); 329 330 dev_dbg(pcm->dev, "PCMSOURCE_CLK-%lu SCLK=%ufs SCLK_DIV=%d SYNC_DIV=%d\n", 331 clk_get_rate(clk), pcm->sclk_per_fs, 332 sclk_div, sync_div); 333 334 return 0; 335 } 336 337 static int s3c_pcm_set_fmt(struct snd_soc_dai *cpu_dai, 338 unsigned int fmt) 339 { 340 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai); 341 void __iomem *regs = pcm->regs; 342 unsigned long flags; 343 int ret = 0; 344 u32 ctl; 345 346 dev_dbg(pcm->dev, "Entered %s\n", __func__); 347 348 spin_lock_irqsave(&pcm->lock, flags); 349 350 ctl = readl(regs + S3C_PCM_CTL); 351 352 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 353 case SND_SOC_DAIFMT_IB_NF: 354 /* Nothing to do, IB_NF by default */ 355 break; 356 default: 357 dev_err(pcm->dev, "Unsupported clock inversion!\n"); 358 ret = -EINVAL; 359 goto exit; 360 } 361 362 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 363 case SND_SOC_DAIFMT_CBS_CFS: 364 /* Nothing to do, Master by default */ 365 break; 366 default: 367 dev_err(pcm->dev, "Unsupported master/slave format!\n"); 368 ret = -EINVAL; 369 goto exit; 370 } 371 372 switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) { 373 case SND_SOC_DAIFMT_CONT: 374 pcm->idleclk = 1; 375 break; 376 case SND_SOC_DAIFMT_GATED: 377 pcm->idleclk = 0; 378 break; 379 default: 380 dev_err(pcm->dev, "Invalid Clock gating request!\n"); 381 ret = -EINVAL; 382 goto exit; 383 } 384 385 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 386 case SND_SOC_DAIFMT_DSP_A: 387 ctl |= S3C_PCM_CTL_TXMSB_AFTER_FSYNC; 388 ctl |= S3C_PCM_CTL_RXMSB_AFTER_FSYNC; 389 break; 390 case SND_SOC_DAIFMT_DSP_B: 391 ctl &= ~S3C_PCM_CTL_TXMSB_AFTER_FSYNC; 392 ctl &= ~S3C_PCM_CTL_RXMSB_AFTER_FSYNC; 393 break; 394 default: 395 dev_err(pcm->dev, "Unsupported data format!\n"); 396 ret = -EINVAL; 397 goto exit; 398 } 399 400 writel(ctl, regs + S3C_PCM_CTL); 401 402 exit: 403 spin_unlock_irqrestore(&pcm->lock, flags); 404 405 return ret; 406 } 407 408 static int s3c_pcm_set_clkdiv(struct snd_soc_dai *cpu_dai, 409 int div_id, int div) 410 { 411 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai); 412 413 switch (div_id) { 414 case S3C_PCM_SCLK_PER_FS: 415 pcm->sclk_per_fs = div; 416 break; 417 418 default: 419 return -EINVAL; 420 } 421 422 return 0; 423 } 424 425 static int s3c_pcm_set_sysclk(struct snd_soc_dai *cpu_dai, 426 int clk_id, unsigned int freq, int dir) 427 { 428 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai); 429 void __iomem *regs = pcm->regs; 430 u32 clkctl = readl(regs + S3C_PCM_CLKCTL); 431 432 switch (clk_id) { 433 case S3C_PCM_CLKSRC_PCLK: 434 clkctl |= S3C_PCM_CLKCTL_SERCLKSEL_PCLK; 435 break; 436 437 case S3C_PCM_CLKSRC_MUX: 438 clkctl &= ~S3C_PCM_CLKCTL_SERCLKSEL_PCLK; 439 440 if (clk_get_rate(pcm->cclk) != freq) 441 clk_set_rate(pcm->cclk, freq); 442 443 break; 444 445 default: 446 return -EINVAL; 447 } 448 449 writel(clkctl, regs + S3C_PCM_CLKCTL); 450 451 return 0; 452 } 453 454 static struct snd_soc_dai_ops s3c_pcm_dai_ops = { 455 .set_sysclk = s3c_pcm_set_sysclk, 456 .set_clkdiv = s3c_pcm_set_clkdiv, 457 .trigger = s3c_pcm_trigger, 458 .hw_params = s3c_pcm_hw_params, 459 .set_fmt = s3c_pcm_set_fmt, 460 }; 461 462 #define S3C_PCM_RATES SNDRV_PCM_RATE_8000_96000 463 464 #define S3C_PCM_DAI_DECLARE \ 465 .symmetric_rates = 1, \ 466 .ops = &s3c_pcm_dai_ops, \ 467 .playback = { \ 468 .channels_min = 2, \ 469 .channels_max = 2, \ 470 .rates = S3C_PCM_RATES, \ 471 .formats = SNDRV_PCM_FMTBIT_S16_LE, \ 472 }, \ 473 .capture = { \ 474 .channels_min = 2, \ 475 .channels_max = 2, \ 476 .rates = S3C_PCM_RATES, \ 477 .formats = SNDRV_PCM_FMTBIT_S16_LE, \ 478 } 479 480 struct snd_soc_dai_driver s3c_pcm_dai[] = { 481 [0] = { 482 .name = "samsung-pcm.0", 483 S3C_PCM_DAI_DECLARE, 484 }, 485 [1] = { 486 .name = "samsung-pcm.1", 487 S3C_PCM_DAI_DECLARE, 488 }, 489 }; 490 EXPORT_SYMBOL_GPL(s3c_pcm_dai); 491 492 static __devinit int s3c_pcm_dev_probe(struct platform_device *pdev) 493 { 494 struct s3c_pcm_info *pcm; 495 struct resource *mem_res, *dmatx_res, *dmarx_res; 496 struct s3c_audio_pdata *pcm_pdata; 497 int ret; 498 499 /* Check for valid device index */ 500 if ((pdev->id < 0) || pdev->id >= ARRAY_SIZE(s3c_pcm)) { 501 dev_err(&pdev->dev, "id %d out of range\n", pdev->id); 502 return -EINVAL; 503 } 504 505 pcm_pdata = pdev->dev.platform_data; 506 507 /* Check for availability of necessary resource */ 508 dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0); 509 if (!dmatx_res) { 510 dev_err(&pdev->dev, "Unable to get PCM-TX dma resource\n"); 511 return -ENXIO; 512 } 513 514 dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1); 515 if (!dmarx_res) { 516 dev_err(&pdev->dev, "Unable to get PCM-RX dma resource\n"); 517 return -ENXIO; 518 } 519 520 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 521 if (!mem_res) { 522 dev_err(&pdev->dev, "Unable to get register resource\n"); 523 return -ENXIO; 524 } 525 526 if (pcm_pdata && pcm_pdata->cfg_gpio && pcm_pdata->cfg_gpio(pdev)) { 527 dev_err(&pdev->dev, "Unable to configure gpio\n"); 528 return -EINVAL; 529 } 530 531 pcm = &s3c_pcm[pdev->id]; 532 pcm->dev = &pdev->dev; 533 534 spin_lock_init(&pcm->lock); 535 536 /* Default is 128fs */ 537 pcm->sclk_per_fs = 128; 538 539 pcm->cclk = clk_get(&pdev->dev, "audio-bus"); 540 if (IS_ERR(pcm->cclk)) { 541 dev_err(&pdev->dev, "failed to get audio-bus\n"); 542 ret = PTR_ERR(pcm->cclk); 543 goto err1; 544 } 545 clk_enable(pcm->cclk); 546 547 /* record our pcm structure for later use in the callbacks */ 548 dev_set_drvdata(&pdev->dev, pcm); 549 550 if (!request_mem_region(mem_res->start, 551 resource_size(mem_res), "samsung-pcm")) { 552 dev_err(&pdev->dev, "Unable to request register region\n"); 553 ret = -EBUSY; 554 goto err2; 555 } 556 557 pcm->regs = ioremap(mem_res->start, 0x100); 558 if (pcm->regs == NULL) { 559 dev_err(&pdev->dev, "cannot ioremap registers\n"); 560 ret = -ENXIO; 561 goto err3; 562 } 563 564 pcm->pclk = clk_get(&pdev->dev, "pcm"); 565 if (IS_ERR(pcm->pclk)) { 566 dev_err(&pdev->dev, "failed to get pcm_clock\n"); 567 ret = -ENOENT; 568 goto err4; 569 } 570 clk_enable(pcm->pclk); 571 572 ret = snd_soc_register_dai(&pdev->dev, &s3c_pcm_dai[pdev->id]); 573 if (ret != 0) { 574 dev_err(&pdev->dev, "failed to get pcm_clock\n"); 575 goto err5; 576 } 577 578 s3c_pcm_stereo_in[pdev->id].dma_addr = mem_res->start 579 + S3C_PCM_RXFIFO; 580 s3c_pcm_stereo_out[pdev->id].dma_addr = mem_res->start 581 + S3C_PCM_TXFIFO; 582 583 s3c_pcm_stereo_in[pdev->id].channel = dmarx_res->start; 584 s3c_pcm_stereo_out[pdev->id].channel = dmatx_res->start; 585 586 pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id]; 587 pcm->dma_playback = &s3c_pcm_stereo_out[pdev->id]; 588 589 return 0; 590 591 err5: 592 clk_disable(pcm->pclk); 593 clk_put(pcm->pclk); 594 err4: 595 iounmap(pcm->regs); 596 err3: 597 release_mem_region(mem_res->start, resource_size(mem_res)); 598 err2: 599 clk_disable(pcm->cclk); 600 clk_put(pcm->cclk); 601 err1: 602 return ret; 603 } 604 605 static __devexit int s3c_pcm_dev_remove(struct platform_device *pdev) 606 { 607 struct s3c_pcm_info *pcm = &s3c_pcm[pdev->id]; 608 struct resource *mem_res; 609 610 snd_soc_unregister_dai(&pdev->dev); 611 612 iounmap(pcm->regs); 613 614 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 615 release_mem_region(mem_res->start, resource_size(mem_res)); 616 617 clk_disable(pcm->cclk); 618 clk_disable(pcm->pclk); 619 clk_put(pcm->pclk); 620 clk_put(pcm->cclk); 621 622 return 0; 623 } 624 625 static struct platform_driver s3c_pcm_driver = { 626 .probe = s3c_pcm_dev_probe, 627 .remove = s3c_pcm_dev_remove, 628 .driver = { 629 .name = "samsung-pcm", 630 .owner = THIS_MODULE, 631 }, 632 }; 633 634 static int __init s3c_pcm_init(void) 635 { 636 return platform_driver_register(&s3c_pcm_driver); 637 } 638 module_init(s3c_pcm_init); 639 640 static void __exit s3c_pcm_exit(void) 641 { 642 platform_driver_unregister(&s3c_pcm_driver); 643 } 644 module_exit(s3c_pcm_exit); 645 646 /* Module information */ 647 MODULE_AUTHOR("Jaswinder Singh, <jassi.brar@samsung.com>"); 648 MODULE_DESCRIPTION("S3C PCM Controller Driver"); 649 MODULE_LICENSE("GPL"); 650 MODULE_ALIAS("platform:samsung-pcm"); 651