1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * omap-mcbsp.c -- OMAP ALSA SoC DAI driver using McBSP port 4 * 5 * Copyright (C) 2008 Nokia Corporation 6 * 7 * Contact: Jarkko Nikula <jarkko.nikula@bitmer.com> 8 * Peter Ujfalusi <peter.ujfalusi@ti.com> 9 */ 10 11 #include <linux/init.h> 12 #include <linux/module.h> 13 #include <linux/device.h> 14 #include <linux/pm_runtime.h> 15 #include <linux/of.h> 16 #include <linux/of_device.h> 17 #include <sound/core.h> 18 #include <sound/pcm.h> 19 #include <sound/pcm_params.h> 20 #include <sound/initval.h> 21 #include <sound/soc.h> 22 #include <sound/dmaengine_pcm.h> 23 24 #include "omap-mcbsp-priv.h" 25 #include "omap-mcbsp.h" 26 #include "sdma-pcm.h" 27 28 #define OMAP_MCBSP_RATES (SNDRV_PCM_RATE_8000_96000) 29 30 enum { 31 OMAP_MCBSP_WORD_8 = 0, 32 OMAP_MCBSP_WORD_12, 33 OMAP_MCBSP_WORD_16, 34 OMAP_MCBSP_WORD_20, 35 OMAP_MCBSP_WORD_24, 36 OMAP_MCBSP_WORD_32, 37 }; 38 39 static void omap_mcbsp_dump_reg(struct omap_mcbsp *mcbsp) 40 { 41 dev_dbg(mcbsp->dev, "**** McBSP%d regs ****\n", mcbsp->id); 42 dev_dbg(mcbsp->dev, "DRR2: 0x%04x\n", MCBSP_READ(mcbsp, DRR2)); 43 dev_dbg(mcbsp->dev, "DRR1: 0x%04x\n", MCBSP_READ(mcbsp, DRR1)); 44 dev_dbg(mcbsp->dev, "DXR2: 0x%04x\n", MCBSP_READ(mcbsp, DXR2)); 45 dev_dbg(mcbsp->dev, "DXR1: 0x%04x\n", MCBSP_READ(mcbsp, DXR1)); 46 dev_dbg(mcbsp->dev, "SPCR2: 0x%04x\n", MCBSP_READ(mcbsp, SPCR2)); 47 dev_dbg(mcbsp->dev, "SPCR1: 0x%04x\n", MCBSP_READ(mcbsp, SPCR1)); 48 dev_dbg(mcbsp->dev, "RCR2: 0x%04x\n", MCBSP_READ(mcbsp, RCR2)); 49 dev_dbg(mcbsp->dev, "RCR1: 0x%04x\n", MCBSP_READ(mcbsp, RCR1)); 50 dev_dbg(mcbsp->dev, "XCR2: 0x%04x\n", MCBSP_READ(mcbsp, XCR2)); 51 dev_dbg(mcbsp->dev, "XCR1: 0x%04x\n", MCBSP_READ(mcbsp, XCR1)); 52 dev_dbg(mcbsp->dev, "SRGR2: 0x%04x\n", MCBSP_READ(mcbsp, SRGR2)); 53 dev_dbg(mcbsp->dev, "SRGR1: 0x%04x\n", MCBSP_READ(mcbsp, SRGR1)); 54 dev_dbg(mcbsp->dev, "PCR0: 0x%04x\n", MCBSP_READ(mcbsp, PCR0)); 55 dev_dbg(mcbsp->dev, "***********************\n"); 56 } 57 58 static int omap2_mcbsp_set_clks_src(struct omap_mcbsp *mcbsp, u8 fck_src_id) 59 { 60 struct clk *fck_src; 61 const char *src; 62 int r; 63 64 if (fck_src_id == MCBSP_CLKS_PAD_SRC) 65 src = "pad_fck"; 66 else if (fck_src_id == MCBSP_CLKS_PRCM_SRC) 67 src = "prcm_fck"; 68 else 69 return -EINVAL; 70 71 fck_src = clk_get(mcbsp->dev, src); 72 if (IS_ERR(fck_src)) { 73 dev_err(mcbsp->dev, "CLKS: could not clk_get() %s\n", src); 74 return -EINVAL; 75 } 76 77 pm_runtime_put_sync(mcbsp->dev); 78 79 r = clk_set_parent(mcbsp->fclk, fck_src); 80 if (r) 81 dev_err(mcbsp->dev, "CLKS: could not clk_set_parent() to %s\n", 82 src); 83 84 pm_runtime_get_sync(mcbsp->dev); 85 86 clk_put(fck_src); 87 88 return r; 89 } 90 91 static irqreturn_t omap_mcbsp_irq_handler(int irq, void *data) 92 { 93 struct omap_mcbsp *mcbsp = data; 94 u16 irqst; 95 96 irqst = MCBSP_READ(mcbsp, IRQST); 97 dev_dbg(mcbsp->dev, "IRQ callback : 0x%x\n", irqst); 98 99 if (irqst & RSYNCERREN) 100 dev_err(mcbsp->dev, "RX Frame Sync Error!\n"); 101 if (irqst & RFSREN) 102 dev_dbg(mcbsp->dev, "RX Frame Sync\n"); 103 if (irqst & REOFEN) 104 dev_dbg(mcbsp->dev, "RX End Of Frame\n"); 105 if (irqst & RRDYEN) 106 dev_dbg(mcbsp->dev, "RX Buffer Threshold Reached\n"); 107 if (irqst & RUNDFLEN) 108 dev_err(mcbsp->dev, "RX Buffer Underflow!\n"); 109 if (irqst & ROVFLEN) 110 dev_err(mcbsp->dev, "RX Buffer Overflow!\n"); 111 112 if (irqst & XSYNCERREN) 113 dev_err(mcbsp->dev, "TX Frame Sync Error!\n"); 114 if (irqst & XFSXEN) 115 dev_dbg(mcbsp->dev, "TX Frame Sync\n"); 116 if (irqst & XEOFEN) 117 dev_dbg(mcbsp->dev, "TX End Of Frame\n"); 118 if (irqst & XRDYEN) 119 dev_dbg(mcbsp->dev, "TX Buffer threshold Reached\n"); 120 if (irqst & XUNDFLEN) 121 dev_err(mcbsp->dev, "TX Buffer Underflow!\n"); 122 if (irqst & XOVFLEN) 123 dev_err(mcbsp->dev, "TX Buffer Overflow!\n"); 124 if (irqst & XEMPTYEOFEN) 125 dev_dbg(mcbsp->dev, "TX Buffer empty at end of frame\n"); 126 127 MCBSP_WRITE(mcbsp, IRQST, irqst); 128 129 return IRQ_HANDLED; 130 } 131 132 static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *data) 133 { 134 struct omap_mcbsp *mcbsp = data; 135 u16 irqst_spcr2; 136 137 irqst_spcr2 = MCBSP_READ(mcbsp, SPCR2); 138 dev_dbg(mcbsp->dev, "TX IRQ callback : 0x%x\n", irqst_spcr2); 139 140 if (irqst_spcr2 & XSYNC_ERR) { 141 dev_err(mcbsp->dev, "TX Frame Sync Error! : 0x%x\n", 142 irqst_spcr2); 143 /* Writing zero to XSYNC_ERR clears the IRQ */ 144 MCBSP_WRITE(mcbsp, SPCR2, MCBSP_READ_CACHE(mcbsp, SPCR2)); 145 } 146 147 return IRQ_HANDLED; 148 } 149 150 static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *data) 151 { 152 struct omap_mcbsp *mcbsp = data; 153 u16 irqst_spcr1; 154 155 irqst_spcr1 = MCBSP_READ(mcbsp, SPCR1); 156 dev_dbg(mcbsp->dev, "RX IRQ callback : 0x%x\n", irqst_spcr1); 157 158 if (irqst_spcr1 & RSYNC_ERR) { 159 dev_err(mcbsp->dev, "RX Frame Sync Error! : 0x%x\n", 160 irqst_spcr1); 161 /* Writing zero to RSYNC_ERR clears the IRQ */ 162 MCBSP_WRITE(mcbsp, SPCR1, MCBSP_READ_CACHE(mcbsp, SPCR1)); 163 } 164 165 return IRQ_HANDLED; 166 } 167 168 /* 169 * omap_mcbsp_config simply write a config to the 170 * appropriate McBSP. 171 * You either call this function or set the McBSP registers 172 * by yourself before calling omap_mcbsp_start(). 173 */ 174 static void omap_mcbsp_config(struct omap_mcbsp *mcbsp, 175 const struct omap_mcbsp_reg_cfg *config) 176 { 177 dev_dbg(mcbsp->dev, "Configuring McBSP%d phys_base: 0x%08lx\n", 178 mcbsp->id, mcbsp->phys_base); 179 180 /* We write the given config */ 181 MCBSP_WRITE(mcbsp, SPCR2, config->spcr2); 182 MCBSP_WRITE(mcbsp, SPCR1, config->spcr1); 183 MCBSP_WRITE(mcbsp, RCR2, config->rcr2); 184 MCBSP_WRITE(mcbsp, RCR1, config->rcr1); 185 MCBSP_WRITE(mcbsp, XCR2, config->xcr2); 186 MCBSP_WRITE(mcbsp, XCR1, config->xcr1); 187 MCBSP_WRITE(mcbsp, SRGR2, config->srgr2); 188 MCBSP_WRITE(mcbsp, SRGR1, config->srgr1); 189 MCBSP_WRITE(mcbsp, MCR2, config->mcr2); 190 MCBSP_WRITE(mcbsp, MCR1, config->mcr1); 191 MCBSP_WRITE(mcbsp, PCR0, config->pcr0); 192 if (mcbsp->pdata->has_ccr) { 193 MCBSP_WRITE(mcbsp, XCCR, config->xccr); 194 MCBSP_WRITE(mcbsp, RCCR, config->rccr); 195 } 196 /* Enable wakeup behavior */ 197 if (mcbsp->pdata->has_wakeup) 198 MCBSP_WRITE(mcbsp, WAKEUPEN, XRDYEN | RRDYEN); 199 200 /* Enable TX/RX sync error interrupts by default */ 201 if (mcbsp->irq) 202 MCBSP_WRITE(mcbsp, IRQEN, RSYNCERREN | XSYNCERREN | 203 RUNDFLEN | ROVFLEN | XUNDFLEN | XOVFLEN); 204 } 205 206 /** 207 * omap_mcbsp_dma_reg_params - returns the address of mcbsp data register 208 * @mcbsp: omap_mcbsp struct for the McBSP instance 209 * @stream: Stream direction (playback/capture) 210 * 211 * Returns the address of mcbsp data transmit register or data receive register 212 * to be used by DMA for transferring/receiving data 213 */ 214 static int omap_mcbsp_dma_reg_params(struct omap_mcbsp *mcbsp, 215 unsigned int stream) 216 { 217 int data_reg; 218 219 if (stream == SNDRV_PCM_STREAM_PLAYBACK) { 220 if (mcbsp->pdata->reg_size == 2) 221 data_reg = OMAP_MCBSP_REG_DXR1; 222 else 223 data_reg = OMAP_MCBSP_REG_DXR; 224 } else { 225 if (mcbsp->pdata->reg_size == 2) 226 data_reg = OMAP_MCBSP_REG_DRR1; 227 else 228 data_reg = OMAP_MCBSP_REG_DRR; 229 } 230 231 return mcbsp->phys_dma_base + data_reg * mcbsp->pdata->reg_step; 232 } 233 234 /* 235 * omap_mcbsp_set_rx_threshold configures the transmit threshold in words. 236 * The threshold parameter is 1 based, and it is converted (threshold - 1) 237 * for the THRSH2 register. 238 */ 239 static void omap_mcbsp_set_tx_threshold(struct omap_mcbsp *mcbsp, u16 threshold) 240 { 241 if (threshold && threshold <= mcbsp->max_tx_thres) 242 MCBSP_WRITE(mcbsp, THRSH2, threshold - 1); 243 } 244 245 /* 246 * omap_mcbsp_set_rx_threshold configures the receive threshold in words. 247 * The threshold parameter is 1 based, and it is converted (threshold - 1) 248 * for the THRSH1 register. 249 */ 250 static void omap_mcbsp_set_rx_threshold(struct omap_mcbsp *mcbsp, u16 threshold) 251 { 252 if (threshold && threshold <= mcbsp->max_rx_thres) 253 MCBSP_WRITE(mcbsp, THRSH1, threshold - 1); 254 } 255 256 /* 257 * omap_mcbsp_get_tx_delay returns the number of used slots in the McBSP FIFO 258 */ 259 static u16 omap_mcbsp_get_tx_delay(struct omap_mcbsp *mcbsp) 260 { 261 u16 buffstat; 262 263 /* Returns the number of free locations in the buffer */ 264 buffstat = MCBSP_READ(mcbsp, XBUFFSTAT); 265 266 /* Number of slots are different in McBSP ports */ 267 return mcbsp->pdata->buffer_size - buffstat; 268 } 269 270 /* 271 * omap_mcbsp_get_rx_delay returns the number of free slots in the McBSP FIFO 272 * to reach the threshold value (when the DMA will be triggered to read it) 273 */ 274 static u16 omap_mcbsp_get_rx_delay(struct omap_mcbsp *mcbsp) 275 { 276 u16 buffstat, threshold; 277 278 /* Returns the number of used locations in the buffer */ 279 buffstat = MCBSP_READ(mcbsp, RBUFFSTAT); 280 /* RX threshold */ 281 threshold = MCBSP_READ(mcbsp, THRSH1); 282 283 /* Return the number of location till we reach the threshold limit */ 284 if (threshold <= buffstat) 285 return 0; 286 else 287 return threshold - buffstat; 288 } 289 290 static int omap_mcbsp_request(struct omap_mcbsp *mcbsp) 291 { 292 void *reg_cache; 293 int err; 294 295 reg_cache = kzalloc(mcbsp->reg_cache_size, GFP_KERNEL); 296 if (!reg_cache) 297 return -ENOMEM; 298 299 spin_lock(&mcbsp->lock); 300 if (!mcbsp->free) { 301 dev_err(mcbsp->dev, "McBSP%d is currently in use\n", mcbsp->id); 302 err = -EBUSY; 303 goto err_kfree; 304 } 305 306 mcbsp->free = false; 307 mcbsp->reg_cache = reg_cache; 308 spin_unlock(&mcbsp->lock); 309 310 if(mcbsp->pdata->ops && mcbsp->pdata->ops->request) 311 mcbsp->pdata->ops->request(mcbsp->id - 1); 312 313 /* 314 * Make sure that transmitter, receiver and sample-rate generator are 315 * not running before activating IRQs. 316 */ 317 MCBSP_WRITE(mcbsp, SPCR1, 0); 318 MCBSP_WRITE(mcbsp, SPCR2, 0); 319 320 if (mcbsp->irq) { 321 err = request_irq(mcbsp->irq, omap_mcbsp_irq_handler, 0, 322 "McBSP", (void *)mcbsp); 323 if (err != 0) { 324 dev_err(mcbsp->dev, "Unable to request IRQ\n"); 325 goto err_clk_disable; 326 } 327 } else { 328 err = request_irq(mcbsp->tx_irq, omap_mcbsp_tx_irq_handler, 0, 329 "McBSP TX", (void *)mcbsp); 330 if (err != 0) { 331 dev_err(mcbsp->dev, "Unable to request TX IRQ\n"); 332 goto err_clk_disable; 333 } 334 335 err = request_irq(mcbsp->rx_irq, omap_mcbsp_rx_irq_handler, 0, 336 "McBSP RX", (void *)mcbsp); 337 if (err != 0) { 338 dev_err(mcbsp->dev, "Unable to request RX IRQ\n"); 339 goto err_free_irq; 340 } 341 } 342 343 return 0; 344 err_free_irq: 345 free_irq(mcbsp->tx_irq, (void *)mcbsp); 346 err_clk_disable: 347 if(mcbsp->pdata->ops && mcbsp->pdata->ops->free) 348 mcbsp->pdata->ops->free(mcbsp->id - 1); 349 350 /* Disable wakeup behavior */ 351 if (mcbsp->pdata->has_wakeup) 352 MCBSP_WRITE(mcbsp, WAKEUPEN, 0); 353 354 spin_lock(&mcbsp->lock); 355 mcbsp->free = true; 356 mcbsp->reg_cache = NULL; 357 err_kfree: 358 spin_unlock(&mcbsp->lock); 359 kfree(reg_cache); 360 361 return err; 362 } 363 364 static void omap_mcbsp_free(struct omap_mcbsp *mcbsp) 365 { 366 void *reg_cache; 367 368 if(mcbsp->pdata->ops && mcbsp->pdata->ops->free) 369 mcbsp->pdata->ops->free(mcbsp->id - 1); 370 371 /* Disable wakeup behavior */ 372 if (mcbsp->pdata->has_wakeup) 373 MCBSP_WRITE(mcbsp, WAKEUPEN, 0); 374 375 /* Disable interrupt requests */ 376 if (mcbsp->irq) 377 MCBSP_WRITE(mcbsp, IRQEN, 0); 378 379 if (mcbsp->irq) { 380 free_irq(mcbsp->irq, (void *)mcbsp); 381 } else { 382 free_irq(mcbsp->rx_irq, (void *)mcbsp); 383 free_irq(mcbsp->tx_irq, (void *)mcbsp); 384 } 385 386 reg_cache = mcbsp->reg_cache; 387 388 /* 389 * Select CLKS source from internal source unconditionally before 390 * marking the McBSP port as free. 391 * If the external clock source via MCBSP_CLKS pin has been selected the 392 * system will refuse to enter idle if the CLKS pin source is not reset 393 * back to internal source. 394 */ 395 if (!mcbsp_omap1()) 396 omap2_mcbsp_set_clks_src(mcbsp, MCBSP_CLKS_PRCM_SRC); 397 398 spin_lock(&mcbsp->lock); 399 if (mcbsp->free) 400 dev_err(mcbsp->dev, "McBSP%d was not reserved\n", mcbsp->id); 401 else 402 mcbsp->free = true; 403 mcbsp->reg_cache = NULL; 404 spin_unlock(&mcbsp->lock); 405 406 kfree(reg_cache); 407 } 408 409 /* 410 * Here we start the McBSP, by enabling transmitter, receiver or both. 411 * If no transmitter or receiver is active prior calling, then sample-rate 412 * generator and frame sync are started. 413 */ 414 static void omap_mcbsp_start(struct omap_mcbsp *mcbsp, int stream) 415 { 416 int tx = (stream == SNDRV_PCM_STREAM_PLAYBACK); 417 int rx = !tx; 418 int enable_srg = 0; 419 u16 w; 420 421 if (mcbsp->st_data) 422 omap_mcbsp_st_start(mcbsp); 423 424 /* Only enable SRG, if McBSP is master */ 425 w = MCBSP_READ_CACHE(mcbsp, PCR0); 426 if (w & (FSXM | FSRM | CLKXM | CLKRM)) 427 enable_srg = !((MCBSP_READ_CACHE(mcbsp, SPCR2) | 428 MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1); 429 430 if (enable_srg) { 431 /* Start the sample generator */ 432 w = MCBSP_READ_CACHE(mcbsp, SPCR2); 433 MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 6)); 434 } 435 436 /* Enable transmitter and receiver */ 437 tx &= 1; 438 w = MCBSP_READ_CACHE(mcbsp, SPCR2); 439 MCBSP_WRITE(mcbsp, SPCR2, w | tx); 440 441 rx &= 1; 442 w = MCBSP_READ_CACHE(mcbsp, SPCR1); 443 MCBSP_WRITE(mcbsp, SPCR1, w | rx); 444 445 /* 446 * Worst case: CLKSRG*2 = 8000khz: (1/8000) * 2 * 2 usec 447 * REVISIT: 100us may give enough time for two CLKSRG, however 448 * due to some unknown PM related, clock gating etc. reason it 449 * is now at 500us. 450 */ 451 udelay(500); 452 453 if (enable_srg) { 454 /* Start frame sync */ 455 w = MCBSP_READ_CACHE(mcbsp, SPCR2); 456 MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 7)); 457 } 458 459 if (mcbsp->pdata->has_ccr) { 460 /* Release the transmitter and receiver */ 461 w = MCBSP_READ_CACHE(mcbsp, XCCR); 462 w &= ~(tx ? XDISABLE : 0); 463 MCBSP_WRITE(mcbsp, XCCR, w); 464 w = MCBSP_READ_CACHE(mcbsp, RCCR); 465 w &= ~(rx ? RDISABLE : 0); 466 MCBSP_WRITE(mcbsp, RCCR, w); 467 } 468 469 /* Dump McBSP Regs */ 470 omap_mcbsp_dump_reg(mcbsp); 471 } 472 473 static void omap_mcbsp_stop(struct omap_mcbsp *mcbsp, int stream) 474 { 475 int tx = (stream == SNDRV_PCM_STREAM_PLAYBACK); 476 int rx = !tx; 477 int idle; 478 u16 w; 479 480 /* Reset transmitter */ 481 tx &= 1; 482 if (mcbsp->pdata->has_ccr) { 483 w = MCBSP_READ_CACHE(mcbsp, XCCR); 484 w |= (tx ? XDISABLE : 0); 485 MCBSP_WRITE(mcbsp, XCCR, w); 486 } 487 w = MCBSP_READ_CACHE(mcbsp, SPCR2); 488 MCBSP_WRITE(mcbsp, SPCR2, w & ~tx); 489 490 /* Reset receiver */ 491 rx &= 1; 492 if (mcbsp->pdata->has_ccr) { 493 w = MCBSP_READ_CACHE(mcbsp, RCCR); 494 w |= (rx ? RDISABLE : 0); 495 MCBSP_WRITE(mcbsp, RCCR, w); 496 } 497 w = MCBSP_READ_CACHE(mcbsp, SPCR1); 498 MCBSP_WRITE(mcbsp, SPCR1, w & ~rx); 499 500 idle = !((MCBSP_READ_CACHE(mcbsp, SPCR2) | 501 MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1); 502 503 if (idle) { 504 /* Reset the sample rate generator */ 505 w = MCBSP_READ_CACHE(mcbsp, SPCR2); 506 MCBSP_WRITE(mcbsp, SPCR2, w & ~(1 << 6)); 507 } 508 509 if (mcbsp->st_data) 510 omap_mcbsp_st_stop(mcbsp); 511 } 512 513 #define max_thres(m) (mcbsp->pdata->buffer_size) 514 #define valid_threshold(m, val) ((val) <= max_thres(m)) 515 #define THRESHOLD_PROP_BUILDER(prop) \ 516 static ssize_t prop##_show(struct device *dev, \ 517 struct device_attribute *attr, char *buf) \ 518 { \ 519 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev); \ 520 \ 521 return sprintf(buf, "%u\n", mcbsp->prop); \ 522 } \ 523 \ 524 static ssize_t prop##_store(struct device *dev, \ 525 struct device_attribute *attr, \ 526 const char *buf, size_t size) \ 527 { \ 528 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev); \ 529 unsigned long val; \ 530 int status; \ 531 \ 532 status = kstrtoul(buf, 0, &val); \ 533 if (status) \ 534 return status; \ 535 \ 536 if (!valid_threshold(mcbsp, val)) \ 537 return -EDOM; \ 538 \ 539 mcbsp->prop = val; \ 540 return size; \ 541 } \ 542 \ 543 static DEVICE_ATTR(prop, 0644, prop##_show, prop##_store) 544 545 THRESHOLD_PROP_BUILDER(max_tx_thres); 546 THRESHOLD_PROP_BUILDER(max_rx_thres); 547 548 static const char * const dma_op_modes[] = { 549 "element", "threshold", 550 }; 551 552 static ssize_t dma_op_mode_show(struct device *dev, 553 struct device_attribute *attr, char *buf) 554 { 555 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev); 556 int dma_op_mode, i = 0; 557 ssize_t len = 0; 558 const char * const *s; 559 560 dma_op_mode = mcbsp->dma_op_mode; 561 562 for (s = &dma_op_modes[i]; i < ARRAY_SIZE(dma_op_modes); s++, i++) { 563 if (dma_op_mode == i) 564 len += sprintf(buf + len, "[%s] ", *s); 565 else 566 len += sprintf(buf + len, "%s ", *s); 567 } 568 len += sprintf(buf + len, "\n"); 569 570 return len; 571 } 572 573 static ssize_t dma_op_mode_store(struct device *dev, 574 struct device_attribute *attr, const char *buf, 575 size_t size) 576 { 577 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev); 578 int i; 579 580 i = sysfs_match_string(dma_op_modes, buf); 581 if (i < 0) 582 return i; 583 584 spin_lock_irq(&mcbsp->lock); 585 if (!mcbsp->free) { 586 size = -EBUSY; 587 goto unlock; 588 } 589 mcbsp->dma_op_mode = i; 590 591 unlock: 592 spin_unlock_irq(&mcbsp->lock); 593 594 return size; 595 } 596 597 static DEVICE_ATTR_RW(dma_op_mode); 598 599 static const struct attribute *additional_attrs[] = { 600 &dev_attr_max_tx_thres.attr, 601 &dev_attr_max_rx_thres.attr, 602 &dev_attr_dma_op_mode.attr, 603 NULL, 604 }; 605 606 static const struct attribute_group additional_attr_group = { 607 .attrs = (struct attribute **)additional_attrs, 608 }; 609 610 /* 611 * McBSP1 and McBSP3 are directly mapped on 1610 and 1510. 612 * 730 has only 2 McBSP, and both of them are MPU peripherals. 613 */ 614 static int omap_mcbsp_init(struct platform_device *pdev) 615 { 616 struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev); 617 struct resource *res; 618 int ret = 0; 619 620 spin_lock_init(&mcbsp->lock); 621 mcbsp->free = true; 622 623 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu"); 624 if (!res) 625 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 626 627 mcbsp->io_base = devm_ioremap_resource(&pdev->dev, res); 628 if (IS_ERR(mcbsp->io_base)) 629 return PTR_ERR(mcbsp->io_base); 630 631 mcbsp->phys_base = res->start; 632 mcbsp->reg_cache_size = resource_size(res); 633 634 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma"); 635 if (!res) 636 mcbsp->phys_dma_base = mcbsp->phys_base; 637 else 638 mcbsp->phys_dma_base = res->start; 639 640 /* 641 * OMAP1, 2 uses two interrupt lines: TX, RX 642 * OMAP2430, OMAP3 SoC have combined IRQ line as well. 643 * OMAP4 and newer SoC only have the combined IRQ line. 644 * Use the combined IRQ if available since it gives better debugging 645 * possibilities. 646 */ 647 mcbsp->irq = platform_get_irq_byname(pdev, "common"); 648 if (mcbsp->irq == -ENXIO) { 649 mcbsp->tx_irq = platform_get_irq_byname(pdev, "tx"); 650 651 if (mcbsp->tx_irq == -ENXIO) { 652 mcbsp->irq = platform_get_irq(pdev, 0); 653 mcbsp->tx_irq = 0; 654 } else { 655 mcbsp->rx_irq = platform_get_irq_byname(pdev, "rx"); 656 mcbsp->irq = 0; 657 } 658 } 659 660 if (!pdev->dev.of_node) { 661 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx"); 662 if (!res) { 663 dev_err(&pdev->dev, "invalid tx DMA channel\n"); 664 return -ENODEV; 665 } 666 mcbsp->dma_req[0] = res->start; 667 mcbsp->dma_data[0].filter_data = &mcbsp->dma_req[0]; 668 669 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx"); 670 if (!res) { 671 dev_err(&pdev->dev, "invalid rx DMA channel\n"); 672 return -ENODEV; 673 } 674 mcbsp->dma_req[1] = res->start; 675 mcbsp->dma_data[1].filter_data = &mcbsp->dma_req[1]; 676 } else { 677 mcbsp->dma_data[0].filter_data = "tx"; 678 mcbsp->dma_data[1].filter_data = "rx"; 679 } 680 681 mcbsp->dma_data[0].addr = omap_mcbsp_dma_reg_params(mcbsp, 682 SNDRV_PCM_STREAM_PLAYBACK); 683 mcbsp->dma_data[1].addr = omap_mcbsp_dma_reg_params(mcbsp, 684 SNDRV_PCM_STREAM_CAPTURE); 685 686 mcbsp->fclk = devm_clk_get(&pdev->dev, "fck"); 687 if (IS_ERR(mcbsp->fclk)) { 688 ret = PTR_ERR(mcbsp->fclk); 689 dev_err(mcbsp->dev, "unable to get fck: %d\n", ret); 690 return ret; 691 } 692 693 mcbsp->dma_op_mode = MCBSP_DMA_MODE_ELEMENT; 694 if (mcbsp->pdata->buffer_size) { 695 /* 696 * Initially configure the maximum thresholds to a safe value. 697 * The McBSP FIFO usage with these values should not go under 698 * 16 locations. 699 * If the whole FIFO without safety buffer is used, than there 700 * is a possibility that the DMA will be not able to push the 701 * new data on time, causing channel shifts in runtime. 702 */ 703 mcbsp->max_tx_thres = max_thres(mcbsp) - 0x10; 704 mcbsp->max_rx_thres = max_thres(mcbsp) - 0x10; 705 706 ret = sysfs_create_group(&mcbsp->dev->kobj, 707 &additional_attr_group); 708 if (ret) { 709 dev_err(mcbsp->dev, 710 "Unable to create additional controls\n"); 711 return ret; 712 } 713 } 714 715 ret = omap_mcbsp_st_init(pdev); 716 if (ret) 717 goto err_st; 718 719 return 0; 720 721 err_st: 722 if (mcbsp->pdata->buffer_size) 723 sysfs_remove_group(&mcbsp->dev->kobj, &additional_attr_group); 724 return ret; 725 } 726 727 /* 728 * Stream DMA parameters. DMA request line and port address are set runtime 729 * since they are different between OMAP1 and later OMAPs 730 */ 731 static void omap_mcbsp_set_threshold(struct snd_pcm_substream *substream, 732 unsigned int packet_size) 733 { 734 struct snd_soc_pcm_runtime *rtd = substream->private_data; 735 struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0); 736 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); 737 int words; 738 739 /* No need to proceed further if McBSP does not have FIFO */ 740 if (mcbsp->pdata->buffer_size == 0) 741 return; 742 743 /* 744 * Configure McBSP threshold based on either: 745 * packet_size, when the sDMA is in packet mode, or based on the 746 * period size in THRESHOLD mode, otherwise use McBSP threshold = 1 747 * for mono streams. 748 */ 749 if (packet_size) 750 words = packet_size; 751 else 752 words = 1; 753 754 /* Configure McBSP internal buffer usage */ 755 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 756 omap_mcbsp_set_tx_threshold(mcbsp, words); 757 else 758 omap_mcbsp_set_rx_threshold(mcbsp, words); 759 } 760 761 static int omap_mcbsp_hwrule_min_buffersize(struct snd_pcm_hw_params *params, 762 struct snd_pcm_hw_rule *rule) 763 { 764 struct snd_interval *buffer_size = hw_param_interval(params, 765 SNDRV_PCM_HW_PARAM_BUFFER_SIZE); 766 struct snd_interval *channels = hw_param_interval(params, 767 SNDRV_PCM_HW_PARAM_CHANNELS); 768 struct omap_mcbsp *mcbsp = rule->private; 769 struct snd_interval frames; 770 int size; 771 772 snd_interval_any(&frames); 773 size = mcbsp->pdata->buffer_size; 774 775 frames.min = size / channels->min; 776 frames.integer = 1; 777 return snd_interval_refine(buffer_size, &frames); 778 } 779 780 static int omap_mcbsp_dai_startup(struct snd_pcm_substream *substream, 781 struct snd_soc_dai *cpu_dai) 782 { 783 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); 784 int err = 0; 785 786 if (!snd_soc_dai_active(cpu_dai)) 787 err = omap_mcbsp_request(mcbsp); 788 789 /* 790 * OMAP3 McBSP FIFO is word structured. 791 * McBSP2 has 1024 + 256 = 1280 word long buffer, 792 * McBSP1,3,4,5 has 128 word long buffer 793 * This means that the size of the FIFO depends on the sample format. 794 * For example on McBSP3: 795 * 16bit samples: size is 128 * 2 = 256 bytes 796 * 32bit samples: size is 128 * 4 = 512 bytes 797 * It is simpler to place constraint for buffer and period based on 798 * channels. 799 * McBSP3 as example again (16 or 32 bit samples): 800 * 1 channel (mono): size is 128 frames (128 words) 801 * 2 channels (stereo): size is 128 / 2 = 64 frames (2 * 64 words) 802 * 4 channels: size is 128 / 4 = 32 frames (4 * 32 words) 803 */ 804 if (mcbsp->pdata->buffer_size) { 805 /* 806 * Rule for the buffer size. We should not allow 807 * smaller buffer than the FIFO size to avoid underruns. 808 * This applies only for the playback stream. 809 */ 810 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 811 snd_pcm_hw_rule_add(substream->runtime, 0, 812 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 813 omap_mcbsp_hwrule_min_buffersize, 814 mcbsp, 815 SNDRV_PCM_HW_PARAM_CHANNELS, -1); 816 817 /* Make sure, that the period size is always even */ 818 snd_pcm_hw_constraint_step(substream->runtime, 0, 819 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2); 820 } 821 822 return err; 823 } 824 825 static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream, 826 struct snd_soc_dai *cpu_dai) 827 { 828 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); 829 int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); 830 int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE; 831 int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK; 832 833 if (mcbsp->latency[stream2]) 834 cpu_latency_qos_update_request(&mcbsp->pm_qos_req, 835 mcbsp->latency[stream2]); 836 else if (mcbsp->latency[stream1]) 837 cpu_latency_qos_remove_request(&mcbsp->pm_qos_req); 838 839 mcbsp->latency[stream1] = 0; 840 841 if (!snd_soc_dai_active(cpu_dai)) { 842 omap_mcbsp_free(mcbsp); 843 mcbsp->configured = 0; 844 } 845 } 846 847 static int omap_mcbsp_dai_prepare(struct snd_pcm_substream *substream, 848 struct snd_soc_dai *cpu_dai) 849 { 850 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); 851 struct pm_qos_request *pm_qos_req = &mcbsp->pm_qos_req; 852 int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); 853 int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE; 854 int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK; 855 int latency = mcbsp->latency[stream2]; 856 857 /* Prevent omap hardware from hitting off between FIFO fills */ 858 if (!latency || mcbsp->latency[stream1] < latency) 859 latency = mcbsp->latency[stream1]; 860 861 if (cpu_latency_qos_request_active(pm_qos_req)) 862 cpu_latency_qos_update_request(pm_qos_req, latency); 863 else if (latency) 864 cpu_latency_qos_add_request(pm_qos_req, latency); 865 866 return 0; 867 } 868 869 static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd, 870 struct snd_soc_dai *cpu_dai) 871 { 872 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); 873 874 switch (cmd) { 875 case SNDRV_PCM_TRIGGER_START: 876 case SNDRV_PCM_TRIGGER_RESUME: 877 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 878 mcbsp->active++; 879 omap_mcbsp_start(mcbsp, substream->stream); 880 break; 881 882 case SNDRV_PCM_TRIGGER_STOP: 883 case SNDRV_PCM_TRIGGER_SUSPEND: 884 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 885 omap_mcbsp_stop(mcbsp, substream->stream); 886 mcbsp->active--; 887 break; 888 default: 889 return -EINVAL; 890 } 891 892 return 0; 893 } 894 895 static snd_pcm_sframes_t omap_mcbsp_dai_delay( 896 struct snd_pcm_substream *substream, 897 struct snd_soc_dai *dai) 898 { 899 struct snd_soc_pcm_runtime *rtd = substream->private_data; 900 struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0); 901 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); 902 u16 fifo_use; 903 snd_pcm_sframes_t delay; 904 905 /* No need to proceed further if McBSP does not have FIFO */ 906 if (mcbsp->pdata->buffer_size == 0) 907 return 0; 908 909 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 910 fifo_use = omap_mcbsp_get_tx_delay(mcbsp); 911 else 912 fifo_use = omap_mcbsp_get_rx_delay(mcbsp); 913 914 /* 915 * Divide the used locations with the channel count to get the 916 * FIFO usage in samples (don't care about partial samples in the 917 * buffer). 918 */ 919 delay = fifo_use / substream->runtime->channels; 920 921 return delay; 922 } 923 924 static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, 925 struct snd_pcm_hw_params *params, 926 struct snd_soc_dai *cpu_dai) 927 { 928 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); 929 struct omap_mcbsp_reg_cfg *regs = &mcbsp->cfg_regs; 930 struct snd_dmaengine_dai_dma_data *dma_data; 931 int wlen, channels, wpf; 932 int pkt_size = 0; 933 unsigned int format, div, framesize, master; 934 unsigned int buffer_size = mcbsp->pdata->buffer_size; 935 936 dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream); 937 channels = params_channels(params); 938 939 switch (params_format(params)) { 940 case SNDRV_PCM_FORMAT_S16_LE: 941 wlen = 16; 942 break; 943 case SNDRV_PCM_FORMAT_S32_LE: 944 wlen = 32; 945 break; 946 default: 947 return -EINVAL; 948 } 949 if (buffer_size) { 950 int latency; 951 952 if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD) { 953 int period_words, max_thrsh; 954 int divider = 0; 955 956 period_words = params_period_bytes(params) / (wlen / 8); 957 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 958 max_thrsh = mcbsp->max_tx_thres; 959 else 960 max_thrsh = mcbsp->max_rx_thres; 961 /* 962 * Use sDMA packet mode if McBSP is in threshold mode: 963 * If period words less than the FIFO size the packet 964 * size is set to the number of period words, otherwise 965 * Look for the biggest threshold value which divides 966 * the period size evenly. 967 */ 968 divider = period_words / max_thrsh; 969 if (period_words % max_thrsh) 970 divider++; 971 while (period_words % divider && 972 divider < period_words) 973 divider++; 974 if (divider == period_words) 975 return -EINVAL; 976 977 pkt_size = period_words / divider; 978 } else if (channels > 1) { 979 /* Use packet mode for non mono streams */ 980 pkt_size = channels; 981 } 982 983 latency = (buffer_size - pkt_size) / channels; 984 latency = latency * USEC_PER_SEC / 985 (params->rate_num / params->rate_den); 986 mcbsp->latency[substream->stream] = latency; 987 988 omap_mcbsp_set_threshold(substream, pkt_size); 989 } 990 991 dma_data->maxburst = pkt_size; 992 993 if (mcbsp->configured) { 994 /* McBSP already configured by another stream */ 995 return 0; 996 } 997 998 regs->rcr2 &= ~(RPHASE | RFRLEN2(0x7f) | RWDLEN2(7)); 999 regs->xcr2 &= ~(RPHASE | XFRLEN2(0x7f) | XWDLEN2(7)); 1000 regs->rcr1 &= ~(RFRLEN1(0x7f) | RWDLEN1(7)); 1001 regs->xcr1 &= ~(XFRLEN1(0x7f) | XWDLEN1(7)); 1002 format = mcbsp->fmt & SND_SOC_DAIFMT_FORMAT_MASK; 1003 wpf = channels; 1004 if (channels == 2 && (format == SND_SOC_DAIFMT_I2S || 1005 format == SND_SOC_DAIFMT_LEFT_J)) { 1006 /* Use dual-phase frames */ 1007 regs->rcr2 |= RPHASE; 1008 regs->xcr2 |= XPHASE; 1009 /* Set 1 word per (McBSP) frame for phase1 and phase2 */ 1010 wpf--; 1011 regs->rcr2 |= RFRLEN2(wpf - 1); 1012 regs->xcr2 |= XFRLEN2(wpf - 1); 1013 } 1014 1015 regs->rcr1 |= RFRLEN1(wpf - 1); 1016 regs->xcr1 |= XFRLEN1(wpf - 1); 1017 1018 switch (params_format(params)) { 1019 case SNDRV_PCM_FORMAT_S16_LE: 1020 /* Set word lengths */ 1021 regs->rcr2 |= RWDLEN2(OMAP_MCBSP_WORD_16); 1022 regs->rcr1 |= RWDLEN1(OMAP_MCBSP_WORD_16); 1023 regs->xcr2 |= XWDLEN2(OMAP_MCBSP_WORD_16); 1024 regs->xcr1 |= XWDLEN1(OMAP_MCBSP_WORD_16); 1025 break; 1026 case SNDRV_PCM_FORMAT_S32_LE: 1027 /* Set word lengths */ 1028 regs->rcr2 |= RWDLEN2(OMAP_MCBSP_WORD_32); 1029 regs->rcr1 |= RWDLEN1(OMAP_MCBSP_WORD_32); 1030 regs->xcr2 |= XWDLEN2(OMAP_MCBSP_WORD_32); 1031 regs->xcr1 |= XWDLEN1(OMAP_MCBSP_WORD_32); 1032 break; 1033 default: 1034 /* Unsupported PCM format */ 1035 return -EINVAL; 1036 } 1037 1038 /* In McBSP master modes, FRAME (i.e. sample rate) is generated 1039 * by _counting_ BCLKs. Calculate frame size in BCLKs */ 1040 master = mcbsp->fmt & SND_SOC_DAIFMT_MASTER_MASK; 1041 if (master == SND_SOC_DAIFMT_CBS_CFS) { 1042 div = mcbsp->clk_div ? mcbsp->clk_div : 1; 1043 framesize = (mcbsp->in_freq / div) / params_rate(params); 1044 1045 if (framesize < wlen * channels) { 1046 printk(KERN_ERR "%s: not enough bandwidth for desired rate and " 1047 "channels\n", __func__); 1048 return -EINVAL; 1049 } 1050 } else 1051 framesize = wlen * channels; 1052 1053 /* Set FS period and length in terms of bit clock periods */ 1054 regs->srgr2 &= ~FPER(0xfff); 1055 regs->srgr1 &= ~FWID(0xff); 1056 switch (format) { 1057 case SND_SOC_DAIFMT_I2S: 1058 case SND_SOC_DAIFMT_LEFT_J: 1059 regs->srgr2 |= FPER(framesize - 1); 1060 regs->srgr1 |= FWID((framesize >> 1) - 1); 1061 break; 1062 case SND_SOC_DAIFMT_DSP_A: 1063 case SND_SOC_DAIFMT_DSP_B: 1064 regs->srgr2 |= FPER(framesize - 1); 1065 regs->srgr1 |= FWID(0); 1066 break; 1067 } 1068 1069 omap_mcbsp_config(mcbsp, &mcbsp->cfg_regs); 1070 mcbsp->wlen = wlen; 1071 mcbsp->configured = 1; 1072 1073 return 0; 1074 } 1075 1076 /* 1077 * This must be called before _set_clkdiv and _set_sysclk since McBSP register 1078 * cache is initialized here 1079 */ 1080 static int omap_mcbsp_dai_set_dai_fmt(struct snd_soc_dai *cpu_dai, 1081 unsigned int fmt) 1082 { 1083 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); 1084 struct omap_mcbsp_reg_cfg *regs = &mcbsp->cfg_regs; 1085 bool inv_fs = false; 1086 1087 if (mcbsp->configured) 1088 return 0; 1089 1090 mcbsp->fmt = fmt; 1091 memset(regs, 0, sizeof(*regs)); 1092 /* Generic McBSP register settings */ 1093 regs->spcr2 |= XINTM(3) | FREE; 1094 regs->spcr1 |= RINTM(3); 1095 /* RFIG and XFIG are not defined in 2430 and on OMAP3+ */ 1096 if (!mcbsp->pdata->has_ccr) { 1097 regs->rcr2 |= RFIG; 1098 regs->xcr2 |= XFIG; 1099 } 1100 1101 /* Configure XCCR/RCCR only for revisions which have ccr registers */ 1102 if (mcbsp->pdata->has_ccr) { 1103 regs->xccr = DXENDLY(1) | XDMAEN | XDISABLE; 1104 regs->rccr = RFULL_CYCLE | RDMAEN | RDISABLE; 1105 } 1106 1107 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 1108 case SND_SOC_DAIFMT_I2S: 1109 /* 1-bit data delay */ 1110 regs->rcr2 |= RDATDLY(1); 1111 regs->xcr2 |= XDATDLY(1); 1112 break; 1113 case SND_SOC_DAIFMT_LEFT_J: 1114 /* 0-bit data delay */ 1115 regs->rcr2 |= RDATDLY(0); 1116 regs->xcr2 |= XDATDLY(0); 1117 regs->spcr1 |= RJUST(2); 1118 /* Invert FS polarity configuration */ 1119 inv_fs = true; 1120 break; 1121 case SND_SOC_DAIFMT_DSP_A: 1122 /* 1-bit data delay */ 1123 regs->rcr2 |= RDATDLY(1); 1124 regs->xcr2 |= XDATDLY(1); 1125 /* Invert FS polarity configuration */ 1126 inv_fs = true; 1127 break; 1128 case SND_SOC_DAIFMT_DSP_B: 1129 /* 0-bit data delay */ 1130 regs->rcr2 |= RDATDLY(0); 1131 regs->xcr2 |= XDATDLY(0); 1132 /* Invert FS polarity configuration */ 1133 inv_fs = true; 1134 break; 1135 default: 1136 /* Unsupported data format */ 1137 return -EINVAL; 1138 } 1139 1140 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 1141 case SND_SOC_DAIFMT_CBS_CFS: 1142 /* McBSP master. Set FS and bit clocks as outputs */ 1143 regs->pcr0 |= FSXM | FSRM | 1144 CLKXM | CLKRM; 1145 /* Sample rate generator drives the FS */ 1146 regs->srgr2 |= FSGM; 1147 break; 1148 case SND_SOC_DAIFMT_CBM_CFS: 1149 /* McBSP slave. FS clock as output */ 1150 regs->srgr2 |= FSGM; 1151 regs->pcr0 |= FSXM | FSRM; 1152 break; 1153 case SND_SOC_DAIFMT_CBM_CFM: 1154 /* McBSP slave */ 1155 break; 1156 default: 1157 /* Unsupported master/slave configuration */ 1158 return -EINVAL; 1159 } 1160 1161 /* Set bit clock (CLKX/CLKR) and FS polarities */ 1162 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 1163 case SND_SOC_DAIFMT_NB_NF: 1164 /* 1165 * Normal BCLK + FS. 1166 * FS active low. TX data driven on falling edge of bit clock 1167 * and RX data sampled on rising edge of bit clock. 1168 */ 1169 regs->pcr0 |= FSXP | FSRP | 1170 CLKXP | CLKRP; 1171 break; 1172 case SND_SOC_DAIFMT_NB_IF: 1173 regs->pcr0 |= CLKXP | CLKRP; 1174 break; 1175 case SND_SOC_DAIFMT_IB_NF: 1176 regs->pcr0 |= FSXP | FSRP; 1177 break; 1178 case SND_SOC_DAIFMT_IB_IF: 1179 break; 1180 default: 1181 return -EINVAL; 1182 } 1183 if (inv_fs) 1184 regs->pcr0 ^= FSXP | FSRP; 1185 1186 return 0; 1187 } 1188 1189 static int omap_mcbsp_dai_set_clkdiv(struct snd_soc_dai *cpu_dai, 1190 int div_id, int div) 1191 { 1192 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); 1193 struct omap_mcbsp_reg_cfg *regs = &mcbsp->cfg_regs; 1194 1195 if (div_id != OMAP_MCBSP_CLKGDV) 1196 return -ENODEV; 1197 1198 mcbsp->clk_div = div; 1199 regs->srgr1 &= ~CLKGDV(0xff); 1200 regs->srgr1 |= CLKGDV(div - 1); 1201 1202 return 0; 1203 } 1204 1205 static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_dai *cpu_dai, 1206 int clk_id, unsigned int freq, 1207 int dir) 1208 { 1209 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); 1210 struct omap_mcbsp_reg_cfg *regs = &mcbsp->cfg_regs; 1211 int err = 0; 1212 1213 if (mcbsp->active) { 1214 if (freq == mcbsp->in_freq) 1215 return 0; 1216 else 1217 return -EBUSY; 1218 } 1219 1220 mcbsp->in_freq = freq; 1221 regs->srgr2 &= ~CLKSM; 1222 regs->pcr0 &= ~SCLKME; 1223 1224 switch (clk_id) { 1225 case OMAP_MCBSP_SYSCLK_CLK: 1226 regs->srgr2 |= CLKSM; 1227 break; 1228 case OMAP_MCBSP_SYSCLK_CLKS_FCLK: 1229 if (mcbsp_omap1()) { 1230 err = -EINVAL; 1231 break; 1232 } 1233 err = omap2_mcbsp_set_clks_src(mcbsp, 1234 MCBSP_CLKS_PRCM_SRC); 1235 break; 1236 case OMAP_MCBSP_SYSCLK_CLKS_EXT: 1237 if (mcbsp_omap1()) { 1238 err = 0; 1239 break; 1240 } 1241 err = omap2_mcbsp_set_clks_src(mcbsp, 1242 MCBSP_CLKS_PAD_SRC); 1243 break; 1244 1245 case OMAP_MCBSP_SYSCLK_CLKX_EXT: 1246 regs->srgr2 |= CLKSM; 1247 regs->pcr0 |= SCLKME; 1248 /* 1249 * If McBSP is master but yet the CLKX/CLKR pin drives the SRG, 1250 * disable output on those pins. This enables to inject the 1251 * reference clock through CLKX/CLKR. For this to work 1252 * set_dai_sysclk() _needs_ to be called after set_dai_fmt(). 1253 */ 1254 regs->pcr0 &= ~CLKXM; 1255 break; 1256 case OMAP_MCBSP_SYSCLK_CLKR_EXT: 1257 regs->pcr0 |= SCLKME; 1258 /* Disable ouput on CLKR pin in master mode */ 1259 regs->pcr0 &= ~CLKRM; 1260 break; 1261 default: 1262 err = -ENODEV; 1263 } 1264 1265 return err; 1266 } 1267 1268 static const struct snd_soc_dai_ops mcbsp_dai_ops = { 1269 .startup = omap_mcbsp_dai_startup, 1270 .shutdown = omap_mcbsp_dai_shutdown, 1271 .prepare = omap_mcbsp_dai_prepare, 1272 .trigger = omap_mcbsp_dai_trigger, 1273 .delay = omap_mcbsp_dai_delay, 1274 .hw_params = omap_mcbsp_dai_hw_params, 1275 .set_fmt = omap_mcbsp_dai_set_dai_fmt, 1276 .set_clkdiv = omap_mcbsp_dai_set_clkdiv, 1277 .set_sysclk = omap_mcbsp_dai_set_dai_sysclk, 1278 }; 1279 1280 static int omap_mcbsp_probe(struct snd_soc_dai *dai) 1281 { 1282 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(dai); 1283 1284 pm_runtime_enable(mcbsp->dev); 1285 1286 snd_soc_dai_init_dma_data(dai, 1287 &mcbsp->dma_data[SNDRV_PCM_STREAM_PLAYBACK], 1288 &mcbsp->dma_data[SNDRV_PCM_STREAM_CAPTURE]); 1289 1290 return 0; 1291 } 1292 1293 static int omap_mcbsp_remove(struct snd_soc_dai *dai) 1294 { 1295 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(dai); 1296 1297 pm_runtime_disable(mcbsp->dev); 1298 1299 return 0; 1300 } 1301 1302 static struct snd_soc_dai_driver omap_mcbsp_dai = { 1303 .probe = omap_mcbsp_probe, 1304 .remove = omap_mcbsp_remove, 1305 .playback = { 1306 .channels_min = 1, 1307 .channels_max = 16, 1308 .rates = OMAP_MCBSP_RATES, 1309 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE, 1310 }, 1311 .capture = { 1312 .channels_min = 1, 1313 .channels_max = 16, 1314 .rates = OMAP_MCBSP_RATES, 1315 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE, 1316 }, 1317 .ops = &mcbsp_dai_ops, 1318 }; 1319 1320 static const struct snd_soc_component_driver omap_mcbsp_component = { 1321 .name = "omap-mcbsp", 1322 }; 1323 1324 static struct omap_mcbsp_platform_data omap2420_pdata = { 1325 .reg_step = 4, 1326 .reg_size = 2, 1327 }; 1328 1329 static struct omap_mcbsp_platform_data omap2430_pdata = { 1330 .reg_step = 4, 1331 .reg_size = 4, 1332 .has_ccr = true, 1333 }; 1334 1335 static struct omap_mcbsp_platform_data omap3_pdata = { 1336 .reg_step = 4, 1337 .reg_size = 4, 1338 .has_ccr = true, 1339 .has_wakeup = true, 1340 }; 1341 1342 static struct omap_mcbsp_platform_data omap4_pdata = { 1343 .reg_step = 4, 1344 .reg_size = 4, 1345 .has_ccr = true, 1346 .has_wakeup = true, 1347 }; 1348 1349 static const struct of_device_id omap_mcbsp_of_match[] = { 1350 { 1351 .compatible = "ti,omap2420-mcbsp", 1352 .data = &omap2420_pdata, 1353 }, 1354 { 1355 .compatible = "ti,omap2430-mcbsp", 1356 .data = &omap2430_pdata, 1357 }, 1358 { 1359 .compatible = "ti,omap3-mcbsp", 1360 .data = &omap3_pdata, 1361 }, 1362 { 1363 .compatible = "ti,omap4-mcbsp", 1364 .data = &omap4_pdata, 1365 }, 1366 { }, 1367 }; 1368 MODULE_DEVICE_TABLE(of, omap_mcbsp_of_match); 1369 1370 static int asoc_mcbsp_probe(struct platform_device *pdev) 1371 { 1372 struct omap_mcbsp_platform_data *pdata = dev_get_platdata(&pdev->dev); 1373 struct omap_mcbsp *mcbsp; 1374 const struct of_device_id *match; 1375 int ret; 1376 1377 match = of_match_device(omap_mcbsp_of_match, &pdev->dev); 1378 if (match) { 1379 struct device_node *node = pdev->dev.of_node; 1380 struct omap_mcbsp_platform_data *pdata_quirk = pdata; 1381 int buffer_size; 1382 1383 pdata = devm_kzalloc(&pdev->dev, 1384 sizeof(struct omap_mcbsp_platform_data), 1385 GFP_KERNEL); 1386 if (!pdata) 1387 return -ENOMEM; 1388 1389 memcpy(pdata, match->data, sizeof(*pdata)); 1390 if (!of_property_read_u32(node, "ti,buffer-size", &buffer_size)) 1391 pdata->buffer_size = buffer_size; 1392 if (pdata_quirk) 1393 pdata->force_ick_on = pdata_quirk->force_ick_on; 1394 } else if (!pdata) { 1395 dev_err(&pdev->dev, "missing platform data.\n"); 1396 return -EINVAL; 1397 } 1398 mcbsp = devm_kzalloc(&pdev->dev, sizeof(struct omap_mcbsp), GFP_KERNEL); 1399 if (!mcbsp) 1400 return -ENOMEM; 1401 1402 mcbsp->id = pdev->id; 1403 mcbsp->pdata = pdata; 1404 mcbsp->dev = &pdev->dev; 1405 platform_set_drvdata(pdev, mcbsp); 1406 1407 ret = omap_mcbsp_init(pdev); 1408 if (ret) 1409 return ret; 1410 1411 if (mcbsp->pdata->reg_size == 2) { 1412 omap_mcbsp_dai.playback.formats = SNDRV_PCM_FMTBIT_S16_LE; 1413 omap_mcbsp_dai.capture.formats = SNDRV_PCM_FMTBIT_S16_LE; 1414 } 1415 1416 ret = devm_snd_soc_register_component(&pdev->dev, 1417 &omap_mcbsp_component, 1418 &omap_mcbsp_dai, 1); 1419 if (ret) 1420 return ret; 1421 1422 return sdma_pcm_platform_register(&pdev->dev, "tx", "rx"); 1423 } 1424 1425 static int asoc_mcbsp_remove(struct platform_device *pdev) 1426 { 1427 struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev); 1428 1429 if (mcbsp->pdata->ops && mcbsp->pdata->ops->free) 1430 mcbsp->pdata->ops->free(mcbsp->id); 1431 1432 if (cpu_latency_qos_request_active(&mcbsp->pm_qos_req)) 1433 cpu_latency_qos_remove_request(&mcbsp->pm_qos_req); 1434 1435 if (mcbsp->pdata->buffer_size) 1436 sysfs_remove_group(&mcbsp->dev->kobj, &additional_attr_group); 1437 1438 omap_mcbsp_st_cleanup(pdev); 1439 1440 return 0; 1441 } 1442 1443 static struct platform_driver asoc_mcbsp_driver = { 1444 .driver = { 1445 .name = "omap-mcbsp", 1446 .of_match_table = omap_mcbsp_of_match, 1447 }, 1448 1449 .probe = asoc_mcbsp_probe, 1450 .remove = asoc_mcbsp_remove, 1451 }; 1452 1453 module_platform_driver(asoc_mcbsp_driver); 1454 1455 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>"); 1456 MODULE_DESCRIPTION("OMAP I2S SoC Interface"); 1457 MODULE_LICENSE("GPL"); 1458 MODULE_ALIAS("platform:omap-mcbsp"); 1459