1 /* 2 * Copyright 2011 Freescale Semiconductor, Inc. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License along 15 * with this program; if not, write to the Free Software Foundation, Inc., 16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 17 */ 18 19 #include <linux/module.h> 20 #include <linux/init.h> 21 #include <linux/of.h> 22 #include <linux/of_device.h> 23 #include <linux/platform_device.h> 24 #include <linux/slab.h> 25 #include <linux/dma-mapping.h> 26 #include <linux/clk.h> 27 #include <linux/delay.h> 28 #include <linux/time.h> 29 #include <linux/fsl/mxs-dma.h> 30 #include <linux/pinctrl/consumer.h> 31 #include <sound/core.h> 32 #include <sound/pcm.h> 33 #include <sound/pcm_params.h> 34 #include <sound/soc.h> 35 #include <sound/saif.h> 36 #include <asm/mach-types.h> 37 #include <mach/hardware.h> 38 #include <mach/mxs.h> 39 40 #include "mxs-saif.h" 41 42 static struct mxs_saif *mxs_saif[2]; 43 44 /* 45 * SAIF is a little different with other normal SOC DAIs on clock using. 46 * 47 * For MXS, two SAIF modules are instantiated on-chip. 48 * Each SAIF has a set of clock pins and can be operating in master 49 * mode simultaneously if they are connected to different off-chip codecs. 50 * Also, one of the two SAIFs can master or drive the clock pins while the 51 * other SAIF, in slave mode, receives clocking from the master SAIF. 52 * This also means that both SAIFs must operate at the same sample rate. 53 * 54 * We abstract this as each saif has a master, the master could be 55 * himself or other saifs. In the generic saif driver, saif does not need 56 * to know the different clkmux. Saif only needs to know who is his master 57 * and operating his master to generate the proper clock rate for him. 58 * The master id is provided in mach-specific layer according to different 59 * clkmux setting. 60 */ 61 62 static int mxs_saif_set_dai_sysclk(struct snd_soc_dai *cpu_dai, 63 int clk_id, unsigned int freq, int dir) 64 { 65 struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); 66 67 switch (clk_id) { 68 case MXS_SAIF_MCLK: 69 saif->mclk = freq; 70 break; 71 default: 72 return -EINVAL; 73 } 74 return 0; 75 } 76 77 /* 78 * Since SAIF may work on EXTMASTER mode, IOW, it's working BITCLK&LRCLK 79 * is provided by other SAIF, we provide a interface here to get its master 80 * from its master_id. 81 * Note that the master could be himself. 82 */ 83 static inline struct mxs_saif *mxs_saif_get_master(struct mxs_saif * saif) 84 { 85 return mxs_saif[saif->master_id]; 86 } 87 88 /* 89 * Set SAIF clock and MCLK 90 */ 91 static int mxs_saif_set_clk(struct mxs_saif *saif, 92 unsigned int mclk, 93 unsigned int rate) 94 { 95 u32 scr; 96 int ret; 97 struct mxs_saif *master_saif; 98 99 dev_dbg(saif->dev, "mclk %d rate %d\n", mclk, rate); 100 101 /* Set master saif to generate proper clock */ 102 master_saif = mxs_saif_get_master(saif); 103 if (!master_saif) 104 return -EINVAL; 105 106 dev_dbg(saif->dev, "master saif%d\n", master_saif->id); 107 108 /* Checking if can playback and capture simutaneously */ 109 if (master_saif->ongoing && rate != master_saif->cur_rate) { 110 dev_err(saif->dev, 111 "can not change clock, master saif%d(rate %d) is ongoing\n", 112 master_saif->id, master_saif->cur_rate); 113 return -EINVAL; 114 } 115 116 scr = __raw_readl(master_saif->base + SAIF_CTRL); 117 scr &= ~BM_SAIF_CTRL_BITCLK_MULT_RATE; 118 scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE; 119 120 /* 121 * Set SAIF clock 122 * 123 * The SAIF clock should be either 384*fs or 512*fs. 124 * If MCLK is used, the SAIF clk ratio need to match mclk ratio. 125 * For 32x mclk, set saif clk as 512*fs. 126 * For 48x mclk, set saif clk as 384*fs. 127 * 128 * If MCLK is not used, we just set saif clk to 512*fs. 129 */ 130 clk_prepare_enable(master_saif->clk); 131 132 if (master_saif->mclk_in_use) { 133 if (mclk % 32 == 0) { 134 scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE; 135 ret = clk_set_rate(master_saif->clk, 512 * rate); 136 } else if (mclk % 48 == 0) { 137 scr |= BM_SAIF_CTRL_BITCLK_BASE_RATE; 138 ret = clk_set_rate(master_saif->clk, 384 * rate); 139 } else { 140 /* SAIF MCLK should be either 32x or 48x */ 141 clk_disable_unprepare(master_saif->clk); 142 return -EINVAL; 143 } 144 } else { 145 ret = clk_set_rate(master_saif->clk, 512 * rate); 146 scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE; 147 } 148 149 clk_disable_unprepare(master_saif->clk); 150 151 if (ret) 152 return ret; 153 154 master_saif->cur_rate = rate; 155 156 if (!master_saif->mclk_in_use) { 157 __raw_writel(scr, master_saif->base + SAIF_CTRL); 158 return 0; 159 } 160 161 /* 162 * Program the over-sample rate for MCLK output 163 * 164 * The available MCLK range is 32x, 48x... 512x. The rate 165 * could be from 8kHz to 192kH. 166 */ 167 switch (mclk / rate) { 168 case 32: 169 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(4); 170 break; 171 case 64: 172 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(3); 173 break; 174 case 128: 175 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(2); 176 break; 177 case 256: 178 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(1); 179 break; 180 case 512: 181 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(0); 182 break; 183 case 48: 184 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(3); 185 break; 186 case 96: 187 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(2); 188 break; 189 case 192: 190 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(1); 191 break; 192 case 384: 193 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(0); 194 break; 195 default: 196 return -EINVAL; 197 } 198 199 __raw_writel(scr, master_saif->base + SAIF_CTRL); 200 201 return 0; 202 } 203 204 /* 205 * Put and disable MCLK. 206 */ 207 int mxs_saif_put_mclk(unsigned int saif_id) 208 { 209 struct mxs_saif *saif = mxs_saif[saif_id]; 210 u32 stat; 211 212 if (!saif) 213 return -EINVAL; 214 215 stat = __raw_readl(saif->base + SAIF_STAT); 216 if (stat & BM_SAIF_STAT_BUSY) { 217 dev_err(saif->dev, "error: busy\n"); 218 return -EBUSY; 219 } 220 221 clk_disable_unprepare(saif->clk); 222 223 /* disable MCLK output */ 224 __raw_writel(BM_SAIF_CTRL_CLKGATE, 225 saif->base + SAIF_CTRL + MXS_SET_ADDR); 226 __raw_writel(BM_SAIF_CTRL_RUN, 227 saif->base + SAIF_CTRL + MXS_CLR_ADDR); 228 229 saif->mclk_in_use = 0; 230 return 0; 231 } 232 EXPORT_SYMBOL_GPL(mxs_saif_put_mclk); 233 234 /* 235 * Get MCLK and set clock rate, then enable it 236 * 237 * This interface is used for codecs who are using MCLK provided 238 * by saif. 239 */ 240 int mxs_saif_get_mclk(unsigned int saif_id, unsigned int mclk, 241 unsigned int rate) 242 { 243 struct mxs_saif *saif = mxs_saif[saif_id]; 244 u32 stat; 245 int ret; 246 struct mxs_saif *master_saif; 247 248 if (!saif) 249 return -EINVAL; 250 251 /* Clear Reset */ 252 __raw_writel(BM_SAIF_CTRL_SFTRST, 253 saif->base + SAIF_CTRL + MXS_CLR_ADDR); 254 255 /* FIXME: need clear clk gate for register r/w */ 256 __raw_writel(BM_SAIF_CTRL_CLKGATE, 257 saif->base + SAIF_CTRL + MXS_CLR_ADDR); 258 259 master_saif = mxs_saif_get_master(saif); 260 if (saif != master_saif) { 261 dev_err(saif->dev, "can not get mclk from a non-master saif\n"); 262 return -EINVAL; 263 } 264 265 stat = __raw_readl(saif->base + SAIF_STAT); 266 if (stat & BM_SAIF_STAT_BUSY) { 267 dev_err(saif->dev, "error: busy\n"); 268 return -EBUSY; 269 } 270 271 saif->mclk_in_use = 1; 272 ret = mxs_saif_set_clk(saif, mclk, rate); 273 if (ret) 274 return ret; 275 276 ret = clk_prepare_enable(saif->clk); 277 if (ret) 278 return ret; 279 280 /* enable MCLK output */ 281 __raw_writel(BM_SAIF_CTRL_RUN, 282 saif->base + SAIF_CTRL + MXS_SET_ADDR); 283 284 return 0; 285 } 286 EXPORT_SYMBOL_GPL(mxs_saif_get_mclk); 287 288 /* 289 * SAIF DAI format configuration. 290 * Should only be called when port is inactive. 291 */ 292 static int mxs_saif_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) 293 { 294 u32 scr, stat; 295 u32 scr0; 296 struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); 297 298 stat = __raw_readl(saif->base + SAIF_STAT); 299 if (stat & BM_SAIF_STAT_BUSY) { 300 dev_err(cpu_dai->dev, "error: busy\n"); 301 return -EBUSY; 302 } 303 304 scr0 = __raw_readl(saif->base + SAIF_CTRL); 305 scr0 = scr0 & ~BM_SAIF_CTRL_BITCLK_EDGE & ~BM_SAIF_CTRL_LRCLK_POLARITY \ 306 & ~BM_SAIF_CTRL_JUSTIFY & ~BM_SAIF_CTRL_DELAY; 307 scr = 0; 308 309 /* DAI mode */ 310 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 311 case SND_SOC_DAIFMT_I2S: 312 /* data frame low 1clk before data */ 313 scr |= BM_SAIF_CTRL_DELAY; 314 scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY; 315 break; 316 case SND_SOC_DAIFMT_LEFT_J: 317 /* data frame high with data */ 318 scr &= ~BM_SAIF_CTRL_DELAY; 319 scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY; 320 scr &= ~BM_SAIF_CTRL_JUSTIFY; 321 break; 322 default: 323 return -EINVAL; 324 } 325 326 /* DAI clock inversion */ 327 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 328 case SND_SOC_DAIFMT_IB_IF: 329 scr |= BM_SAIF_CTRL_BITCLK_EDGE; 330 scr |= BM_SAIF_CTRL_LRCLK_POLARITY; 331 break; 332 case SND_SOC_DAIFMT_IB_NF: 333 scr |= BM_SAIF_CTRL_BITCLK_EDGE; 334 scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY; 335 break; 336 case SND_SOC_DAIFMT_NB_IF: 337 scr &= ~BM_SAIF_CTRL_BITCLK_EDGE; 338 scr |= BM_SAIF_CTRL_LRCLK_POLARITY; 339 break; 340 case SND_SOC_DAIFMT_NB_NF: 341 scr &= ~BM_SAIF_CTRL_BITCLK_EDGE; 342 scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY; 343 break; 344 } 345 346 /* 347 * Note: We simply just support master mode since SAIF TX can only 348 * work as master. 349 * Here the master is relative to codec side. 350 * Saif internally could be slave when working on EXTMASTER mode. 351 * We just hide this to machine driver. 352 */ 353 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 354 case SND_SOC_DAIFMT_CBS_CFS: 355 if (saif->id == saif->master_id) 356 scr &= ~BM_SAIF_CTRL_SLAVE_MODE; 357 else 358 scr |= BM_SAIF_CTRL_SLAVE_MODE; 359 360 __raw_writel(scr | scr0, saif->base + SAIF_CTRL); 361 break; 362 default: 363 return -EINVAL; 364 } 365 366 return 0; 367 } 368 369 static int mxs_saif_startup(struct snd_pcm_substream *substream, 370 struct snd_soc_dai *cpu_dai) 371 { 372 struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); 373 snd_soc_dai_set_dma_data(cpu_dai, substream, &saif->dma_param); 374 375 /* clear error status to 0 for each re-open */ 376 saif->fifo_underrun = 0; 377 saif->fifo_overrun = 0; 378 379 /* Clear Reset for normal operations */ 380 __raw_writel(BM_SAIF_CTRL_SFTRST, 381 saif->base + SAIF_CTRL + MXS_CLR_ADDR); 382 383 /* clear clock gate */ 384 __raw_writel(BM_SAIF_CTRL_CLKGATE, 385 saif->base + SAIF_CTRL + MXS_CLR_ADDR); 386 387 return 0; 388 } 389 390 /* 391 * Should only be called when port is inactive. 392 * although can be called multiple times by upper layers. 393 */ 394 static int mxs_saif_hw_params(struct snd_pcm_substream *substream, 395 struct snd_pcm_hw_params *params, 396 struct snd_soc_dai *cpu_dai) 397 { 398 struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); 399 struct mxs_saif *master_saif; 400 u32 scr, stat; 401 int ret; 402 403 master_saif = mxs_saif_get_master(saif); 404 if (!master_saif) 405 return -EINVAL; 406 407 /* mclk should already be set */ 408 if (!saif->mclk && saif->mclk_in_use) { 409 dev_err(cpu_dai->dev, "set mclk first\n"); 410 return -EINVAL; 411 } 412 413 stat = __raw_readl(saif->base + SAIF_STAT); 414 if (stat & BM_SAIF_STAT_BUSY) { 415 dev_err(cpu_dai->dev, "error: busy\n"); 416 return -EBUSY; 417 } 418 419 /* 420 * Set saif clk based on sample rate. 421 * If mclk is used, we also set mclk, if not, saif->mclk is 422 * default 0, means not used. 423 */ 424 ret = mxs_saif_set_clk(saif, saif->mclk, params_rate(params)); 425 if (ret) { 426 dev_err(cpu_dai->dev, "unable to get proper clk\n"); 427 return ret; 428 } 429 430 /* prepare clk in hw_param, enable in trigger */ 431 clk_prepare(saif->clk); 432 if (saif != master_saif) { 433 /* 434 * Set an initial clock rate for the saif internal logic to work 435 * properly. This is important when working in EXTMASTER mode 436 * that uses the other saif's BITCLK&LRCLK but it still needs a 437 * basic clock which should be fast enough for the internal 438 * logic. 439 */ 440 clk_enable(saif->clk); 441 ret = clk_set_rate(saif->clk, 24000000); 442 clk_disable(saif->clk); 443 if (ret) 444 return ret; 445 446 clk_prepare(master_saif->clk); 447 } 448 449 scr = __raw_readl(saif->base + SAIF_CTRL); 450 451 scr &= ~BM_SAIF_CTRL_WORD_LENGTH; 452 scr &= ~BM_SAIF_CTRL_BITCLK_48XFS_ENABLE; 453 switch (params_format(params)) { 454 case SNDRV_PCM_FORMAT_S16_LE: 455 scr |= BF_SAIF_CTRL_WORD_LENGTH(0); 456 break; 457 case SNDRV_PCM_FORMAT_S20_3LE: 458 scr |= BF_SAIF_CTRL_WORD_LENGTH(4); 459 scr |= BM_SAIF_CTRL_BITCLK_48XFS_ENABLE; 460 break; 461 case SNDRV_PCM_FORMAT_S24_LE: 462 scr |= BF_SAIF_CTRL_WORD_LENGTH(8); 463 scr |= BM_SAIF_CTRL_BITCLK_48XFS_ENABLE; 464 break; 465 default: 466 return -EINVAL; 467 } 468 469 /* Tx/Rx config */ 470 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 471 /* enable TX mode */ 472 scr &= ~BM_SAIF_CTRL_READ_MODE; 473 } else { 474 /* enable RX mode */ 475 scr |= BM_SAIF_CTRL_READ_MODE; 476 } 477 478 __raw_writel(scr, saif->base + SAIF_CTRL); 479 return 0; 480 } 481 482 static int mxs_saif_prepare(struct snd_pcm_substream *substream, 483 struct snd_soc_dai *cpu_dai) 484 { 485 struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); 486 487 /* enable FIFO error irqs */ 488 __raw_writel(BM_SAIF_CTRL_FIFO_ERROR_IRQ_EN, 489 saif->base + SAIF_CTRL + MXS_SET_ADDR); 490 491 return 0; 492 } 493 494 static int mxs_saif_trigger(struct snd_pcm_substream *substream, int cmd, 495 struct snd_soc_dai *cpu_dai) 496 { 497 struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); 498 struct mxs_saif *master_saif; 499 u32 delay; 500 501 master_saif = mxs_saif_get_master(saif); 502 if (!master_saif) 503 return -EINVAL; 504 505 switch (cmd) { 506 case SNDRV_PCM_TRIGGER_START: 507 case SNDRV_PCM_TRIGGER_RESUME: 508 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 509 dev_dbg(cpu_dai->dev, "start\n"); 510 511 clk_enable(master_saif->clk); 512 if (!master_saif->mclk_in_use) 513 __raw_writel(BM_SAIF_CTRL_RUN, 514 master_saif->base + SAIF_CTRL + MXS_SET_ADDR); 515 516 /* 517 * If the saif's master is not himself, we also need to enable 518 * itself clk for its internal basic logic to work. 519 */ 520 if (saif != master_saif) { 521 clk_enable(saif->clk); 522 __raw_writel(BM_SAIF_CTRL_RUN, 523 saif->base + SAIF_CTRL + MXS_SET_ADDR); 524 } 525 526 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 527 /* 528 * write data to saif data register to trigger 529 * the transfer. 530 * For 24-bit format the 32-bit FIFO register stores 531 * only one channel, so we need to write twice. 532 * This is also safe for the other non 24-bit formats. 533 */ 534 __raw_writel(0, saif->base + SAIF_DATA); 535 __raw_writel(0, saif->base + SAIF_DATA); 536 } else { 537 /* 538 * read data from saif data register to trigger 539 * the receive. 540 * For 24-bit format the 32-bit FIFO register stores 541 * only one channel, so we need to read twice. 542 * This is also safe for the other non 24-bit formats. 543 */ 544 __raw_readl(saif->base + SAIF_DATA); 545 __raw_readl(saif->base + SAIF_DATA); 546 } 547 548 master_saif->ongoing = 1; 549 550 dev_dbg(saif->dev, "CTRL 0x%x STAT 0x%x\n", 551 __raw_readl(saif->base + SAIF_CTRL), 552 __raw_readl(saif->base + SAIF_STAT)); 553 554 dev_dbg(master_saif->dev, "CTRL 0x%x STAT 0x%x\n", 555 __raw_readl(master_saif->base + SAIF_CTRL), 556 __raw_readl(master_saif->base + SAIF_STAT)); 557 break; 558 case SNDRV_PCM_TRIGGER_SUSPEND: 559 case SNDRV_PCM_TRIGGER_STOP: 560 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 561 dev_dbg(cpu_dai->dev, "stop\n"); 562 563 /* wait a while for the current sample to complete */ 564 delay = USEC_PER_SEC / master_saif->cur_rate; 565 566 if (!master_saif->mclk_in_use) { 567 __raw_writel(BM_SAIF_CTRL_RUN, 568 master_saif->base + SAIF_CTRL + MXS_CLR_ADDR); 569 udelay(delay); 570 } 571 clk_disable(master_saif->clk); 572 573 if (saif != master_saif) { 574 __raw_writel(BM_SAIF_CTRL_RUN, 575 saif->base + SAIF_CTRL + MXS_CLR_ADDR); 576 udelay(delay); 577 clk_disable(saif->clk); 578 } 579 580 master_saif->ongoing = 0; 581 582 break; 583 default: 584 return -EINVAL; 585 } 586 587 return 0; 588 } 589 590 #define MXS_SAIF_RATES SNDRV_PCM_RATE_8000_192000 591 #define MXS_SAIF_FORMATS \ 592 (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \ 593 SNDRV_PCM_FMTBIT_S24_LE) 594 595 static const struct snd_soc_dai_ops mxs_saif_dai_ops = { 596 .startup = mxs_saif_startup, 597 .trigger = mxs_saif_trigger, 598 .prepare = mxs_saif_prepare, 599 .hw_params = mxs_saif_hw_params, 600 .set_sysclk = mxs_saif_set_dai_sysclk, 601 .set_fmt = mxs_saif_set_dai_fmt, 602 }; 603 604 static int mxs_saif_dai_probe(struct snd_soc_dai *dai) 605 { 606 struct mxs_saif *saif = dev_get_drvdata(dai->dev); 607 608 snd_soc_dai_set_drvdata(dai, saif); 609 610 return 0; 611 } 612 613 static struct snd_soc_dai_driver mxs_saif_dai = { 614 .name = "mxs-saif", 615 .probe = mxs_saif_dai_probe, 616 .playback = { 617 .channels_min = 2, 618 .channels_max = 2, 619 .rates = MXS_SAIF_RATES, 620 .formats = MXS_SAIF_FORMATS, 621 }, 622 .capture = { 623 .channels_min = 2, 624 .channels_max = 2, 625 .rates = MXS_SAIF_RATES, 626 .formats = MXS_SAIF_FORMATS, 627 }, 628 .ops = &mxs_saif_dai_ops, 629 }; 630 631 static irqreturn_t mxs_saif_irq(int irq, void *dev_id) 632 { 633 struct mxs_saif *saif = dev_id; 634 unsigned int stat; 635 636 stat = __raw_readl(saif->base + SAIF_STAT); 637 if (!(stat & (BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ | 638 BM_SAIF_STAT_FIFO_OVERFLOW_IRQ))) 639 return IRQ_NONE; 640 641 if (stat & BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ) { 642 dev_dbg(saif->dev, "underrun!!! %d\n", ++saif->fifo_underrun); 643 __raw_writel(BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ, 644 saif->base + SAIF_STAT + MXS_CLR_ADDR); 645 } 646 647 if (stat & BM_SAIF_STAT_FIFO_OVERFLOW_IRQ) { 648 dev_dbg(saif->dev, "overrun!!! %d\n", ++saif->fifo_overrun); 649 __raw_writel(BM_SAIF_STAT_FIFO_OVERFLOW_IRQ, 650 saif->base + SAIF_STAT + MXS_CLR_ADDR); 651 } 652 653 dev_dbg(saif->dev, "SAIF_CTRL %x SAIF_STAT %x\n", 654 __raw_readl(saif->base + SAIF_CTRL), 655 __raw_readl(saif->base + SAIF_STAT)); 656 657 return IRQ_HANDLED; 658 } 659 660 static int mxs_saif_probe(struct platform_device *pdev) 661 { 662 struct device_node *np = pdev->dev.of_node; 663 struct resource *iores, *dmares; 664 struct mxs_saif *saif; 665 struct mxs_saif_platform_data *pdata; 666 struct pinctrl *pinctrl; 667 int ret = 0; 668 669 670 if (!np && pdev->id >= ARRAY_SIZE(mxs_saif)) 671 return -EINVAL; 672 673 saif = devm_kzalloc(&pdev->dev, sizeof(*saif), GFP_KERNEL); 674 if (!saif) 675 return -ENOMEM; 676 677 if (np) { 678 struct device_node *master; 679 saif->id = of_alias_get_id(np, "saif"); 680 if (saif->id < 0) 681 return saif->id; 682 /* 683 * If there is no "fsl,saif-master" phandle, it's a saif 684 * master. Otherwise, it's a slave and its phandle points 685 * to the master. 686 */ 687 master = of_parse_phandle(np, "fsl,saif-master", 0); 688 if (!master) { 689 saif->master_id = saif->id; 690 } else { 691 saif->master_id = of_alias_get_id(master, "saif"); 692 if (saif->master_id < 0) 693 return saif->master_id; 694 } 695 } else { 696 saif->id = pdev->id; 697 pdata = pdev->dev.platform_data; 698 if (pdata && !pdata->master_mode) 699 saif->master_id = pdata->master_id; 700 else 701 saif->master_id = saif->id; 702 } 703 704 if (saif->master_id < 0 || saif->master_id >= ARRAY_SIZE(mxs_saif)) { 705 dev_err(&pdev->dev, "get wrong master id\n"); 706 return -EINVAL; 707 } 708 709 mxs_saif[saif->id] = saif; 710 711 pinctrl = devm_pinctrl_get_select_default(&pdev->dev); 712 if (IS_ERR(pinctrl)) { 713 ret = PTR_ERR(pinctrl); 714 return ret; 715 } 716 717 saif->clk = devm_clk_get(&pdev->dev, NULL); 718 if (IS_ERR(saif->clk)) { 719 ret = PTR_ERR(saif->clk); 720 dev_err(&pdev->dev, "Cannot get the clock: %d\n", 721 ret); 722 return ret; 723 } 724 725 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); 726 727 saif->base = devm_request_and_ioremap(&pdev->dev, iores); 728 if (!saif->base) { 729 dev_err(&pdev->dev, "ioremap failed\n"); 730 return -ENODEV; 731 } 732 733 dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0); 734 if (!dmares) { 735 /* 736 * TODO: This is a temporary solution and should be changed 737 * to use generic DMA binding later when the helplers get in. 738 */ 739 ret = of_property_read_u32(np, "fsl,saif-dma-channel", 740 &saif->dma_param.chan_num); 741 if (ret) { 742 dev_err(&pdev->dev, "failed to get dma channel\n"); 743 return ret; 744 } 745 } else { 746 saif->dma_param.chan_num = dmares->start; 747 } 748 749 saif->irq = platform_get_irq(pdev, 0); 750 if (saif->irq < 0) { 751 ret = saif->irq; 752 dev_err(&pdev->dev, "failed to get irq resource: %d\n", 753 ret); 754 return ret; 755 } 756 757 saif->dev = &pdev->dev; 758 ret = devm_request_irq(&pdev->dev, saif->irq, mxs_saif_irq, 0, 759 "mxs-saif", saif); 760 if (ret) { 761 dev_err(&pdev->dev, "failed to request irq\n"); 762 return ret; 763 } 764 765 saif->dma_param.chan_irq = platform_get_irq(pdev, 1); 766 if (saif->dma_param.chan_irq < 0) { 767 ret = saif->dma_param.chan_irq; 768 dev_err(&pdev->dev, "failed to get dma irq resource: %d\n", 769 ret); 770 return ret; 771 } 772 773 platform_set_drvdata(pdev, saif); 774 775 ret = snd_soc_register_dai(&pdev->dev, &mxs_saif_dai); 776 if (ret) { 777 dev_err(&pdev->dev, "register DAI failed\n"); 778 return ret; 779 } 780 781 ret = mxs_pcm_platform_register(&pdev->dev); 782 if (ret) { 783 dev_err(&pdev->dev, "register PCM failed: %d\n", ret); 784 goto failed_pdev_alloc; 785 } 786 787 return 0; 788 789 failed_pdev_alloc: 790 snd_soc_unregister_dai(&pdev->dev); 791 792 return ret; 793 } 794 795 static int mxs_saif_remove(struct platform_device *pdev) 796 { 797 mxs_pcm_platform_unregister(&pdev->dev); 798 snd_soc_unregister_dai(&pdev->dev); 799 800 return 0; 801 } 802 803 static const struct of_device_id mxs_saif_dt_ids[] = { 804 { .compatible = "fsl,imx28-saif", }, 805 { /* sentinel */ } 806 }; 807 MODULE_DEVICE_TABLE(of, mxs_saif_dt_ids); 808 809 static struct platform_driver mxs_saif_driver = { 810 .probe = mxs_saif_probe, 811 .remove = mxs_saif_remove, 812 813 .driver = { 814 .name = "mxs-saif", 815 .owner = THIS_MODULE, 816 .of_match_table = mxs_saif_dt_ids, 817 }, 818 }; 819 820 module_platform_driver(mxs_saif_driver); 821 822 MODULE_AUTHOR("Freescale Semiconductor, Inc."); 823 MODULE_DESCRIPTION("MXS ASoC SAIF driver"); 824 MODULE_LICENSE("GPL"); 825 MODULE_ALIAS("platform:mxs-saif"); 826