1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * i2sbus driver -- pcm routines 4 * 5 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net> 6 */ 7 8 #include <linux/io.h> 9 #include <linux/delay.h> 10 #include <linux/slab.h> 11 #include <sound/core.h> 12 #include <asm/macio.h> 13 #include <linux/pci.h> 14 #include <linux/module.h> 15 #include "../soundbus.h" 16 #include "i2sbus.h" 17 18 static inline void get_pcm_info(struct i2sbus_dev *i2sdev, int in, 19 struct pcm_info **pi, struct pcm_info **other) 20 { 21 if (in) { 22 if (pi) 23 *pi = &i2sdev->in; 24 if (other) 25 *other = &i2sdev->out; 26 } else { 27 if (pi) 28 *pi = &i2sdev->out; 29 if (other) 30 *other = &i2sdev->in; 31 } 32 } 33 34 static int clock_and_divisors(int mclk, int sclk, int rate, int *out) 35 { 36 /* sclk must be derived from mclk! */ 37 if (mclk % sclk) 38 return -1; 39 /* derive sclk register value */ 40 if (i2s_sf_sclkdiv(mclk / sclk, out)) 41 return -1; 42 43 if (I2S_CLOCK_SPEED_18MHz % (rate * mclk) == 0) { 44 if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_18MHz / (rate * mclk), out)) { 45 *out |= I2S_SF_CLOCK_SOURCE_18MHz; 46 return 0; 47 } 48 } 49 if (I2S_CLOCK_SPEED_45MHz % (rate * mclk) == 0) { 50 if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_45MHz / (rate * mclk), out)) { 51 *out |= I2S_SF_CLOCK_SOURCE_45MHz; 52 return 0; 53 } 54 } 55 if (I2S_CLOCK_SPEED_49MHz % (rate * mclk) == 0) { 56 if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_49MHz / (rate * mclk), out)) { 57 *out |= I2S_SF_CLOCK_SOURCE_49MHz; 58 return 0; 59 } 60 } 61 return -1; 62 } 63 64 #define CHECK_RATE(rate) \ 65 do { if (rates & SNDRV_PCM_RATE_ ##rate) { \ 66 int dummy; \ 67 if (clock_and_divisors(sysclock_factor, \ 68 bus_factor, rate, &dummy)) \ 69 rates &= ~SNDRV_PCM_RATE_ ##rate; \ 70 } } while (0) 71 72 static int i2sbus_pcm_open(struct i2sbus_dev *i2sdev, int in) 73 { 74 struct pcm_info *pi, *other; 75 struct soundbus_dev *sdev; 76 int masks_inited = 0, err; 77 struct codec_info_item *cii, *rev; 78 struct snd_pcm_hardware *hw; 79 u64 formats = 0; 80 unsigned int rates = 0; 81 struct transfer_info v; 82 int result = 0; 83 int bus_factor = 0, sysclock_factor = 0; 84 int found_this; 85 86 mutex_lock(&i2sdev->lock); 87 88 get_pcm_info(i2sdev, in, &pi, &other); 89 90 hw = &pi->substream->runtime->hw; 91 sdev = &i2sdev->sound; 92 93 if (pi->active) { 94 /* alsa messed up */ 95 result = -EBUSY; 96 goto out_unlock; 97 } 98 99 /* we now need to assign the hw */ 100 list_for_each_entry(cii, &sdev->codec_list, list) { 101 struct transfer_info *ti = cii->codec->transfers; 102 bus_factor = cii->codec->bus_factor; 103 sysclock_factor = cii->codec->sysclock_factor; 104 while (ti->formats && ti->rates) { 105 v = *ti; 106 if (ti->transfer_in == in 107 && cii->codec->usable(cii, ti, &v)) { 108 if (masks_inited) { 109 formats &= v.formats; 110 rates &= v.rates; 111 } else { 112 formats = v.formats; 113 rates = v.rates; 114 masks_inited = 1; 115 } 116 } 117 ti++; 118 } 119 } 120 if (!masks_inited || !bus_factor || !sysclock_factor) { 121 result = -ENODEV; 122 goto out_unlock; 123 } 124 /* bus dependent stuff */ 125 hw->info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | 126 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_RESUME | 127 SNDRV_PCM_INFO_JOINT_DUPLEX; 128 129 CHECK_RATE(5512); 130 CHECK_RATE(8000); 131 CHECK_RATE(11025); 132 CHECK_RATE(16000); 133 CHECK_RATE(22050); 134 CHECK_RATE(32000); 135 CHECK_RATE(44100); 136 CHECK_RATE(48000); 137 CHECK_RATE(64000); 138 CHECK_RATE(88200); 139 CHECK_RATE(96000); 140 CHECK_RATE(176400); 141 CHECK_RATE(192000); 142 hw->rates = rates; 143 144 /* well. the codec might want 24 bits only, and we'll 145 * ever only transfer 24 bits, but they are top-aligned! 146 * So for alsa, we claim that we're doing full 32 bit 147 * while in reality we'll ignore the lower 8 bits of 148 * that when doing playback (they're transferred as 0 149 * as far as I know, no codecs we have are 32-bit capable 150 * so I can't really test) and when doing recording we'll 151 * always have those lower 8 bits recorded as 0 */ 152 if (formats & SNDRV_PCM_FMTBIT_S24_BE) 153 formats |= SNDRV_PCM_FMTBIT_S32_BE; 154 if (formats & SNDRV_PCM_FMTBIT_U24_BE) 155 formats |= SNDRV_PCM_FMTBIT_U32_BE; 156 /* now mask off what we can support. I suppose we could 157 * also support S24_3LE and some similar formats, but I 158 * doubt there's a codec that would be able to use that, 159 * so we don't support it here. */ 160 hw->formats = formats & (SNDRV_PCM_FMTBIT_S16_BE | 161 SNDRV_PCM_FMTBIT_U16_BE | 162 SNDRV_PCM_FMTBIT_S32_BE | 163 SNDRV_PCM_FMTBIT_U32_BE); 164 165 /* we need to set the highest and lowest rate possible. 166 * These are the highest and lowest rates alsa can 167 * support properly in its bitfield. 168 * Below, we'll use that to restrict to the rate 169 * currently in use (if any). */ 170 hw->rate_min = 5512; 171 hw->rate_max = 192000; 172 /* if the other stream is active, then we can only 173 * support what it is currently using. 174 * FIXME: I lied. This comment is wrong. We can support 175 * anything that works with the same serial format, ie. 176 * when recording 24 bit sound we can well play 16 bit 177 * sound at the same time iff using the same transfer mode. 178 */ 179 if (other->active) { 180 /* FIXME: is this guaranteed by the alsa api? */ 181 hw->formats &= pcm_format_to_bits(i2sdev->format); 182 /* see above, restrict rates to the one we already have */ 183 hw->rate_min = i2sdev->rate; 184 hw->rate_max = i2sdev->rate; 185 } 186 187 hw->channels_min = 2; 188 hw->channels_max = 2; 189 /* these are somewhat arbitrary */ 190 hw->buffer_bytes_max = 131072; 191 hw->period_bytes_min = 256; 192 hw->period_bytes_max = 16384; 193 hw->periods_min = 3; 194 hw->periods_max = MAX_DBDMA_COMMANDS; 195 err = snd_pcm_hw_constraint_integer(pi->substream->runtime, 196 SNDRV_PCM_HW_PARAM_PERIODS); 197 if (err < 0) { 198 result = err; 199 goto out_unlock; 200 } 201 list_for_each_entry(cii, &sdev->codec_list, list) { 202 if (cii->codec->open) { 203 err = cii->codec->open(cii, pi->substream); 204 if (err) { 205 result = err; 206 /* unwind */ 207 found_this = 0; 208 list_for_each_entry_reverse(rev, 209 &sdev->codec_list, list) { 210 if (found_this && rev->codec->close) { 211 rev->codec->close(rev, 212 pi->substream); 213 } 214 if (rev == cii) 215 found_this = 1; 216 } 217 goto out_unlock; 218 } 219 } 220 } 221 222 out_unlock: 223 mutex_unlock(&i2sdev->lock); 224 return result; 225 } 226 227 #undef CHECK_RATE 228 229 static int i2sbus_pcm_close(struct i2sbus_dev *i2sdev, int in) 230 { 231 struct codec_info_item *cii; 232 struct pcm_info *pi; 233 int err = 0, tmp; 234 235 mutex_lock(&i2sdev->lock); 236 237 get_pcm_info(i2sdev, in, &pi, NULL); 238 239 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) { 240 if (cii->codec->close) { 241 tmp = cii->codec->close(cii, pi->substream); 242 if (tmp) 243 err = tmp; 244 } 245 } 246 247 pi->substream = NULL; 248 pi->active = 0; 249 mutex_unlock(&i2sdev->lock); 250 return err; 251 } 252 253 static void i2sbus_wait_for_stop(struct i2sbus_dev *i2sdev, 254 struct pcm_info *pi) 255 { 256 unsigned long flags; 257 DECLARE_COMPLETION_ONSTACK(done); 258 long timeout; 259 260 spin_lock_irqsave(&i2sdev->low_lock, flags); 261 if (pi->dbdma_ring.stopping) { 262 pi->stop_completion = &done; 263 spin_unlock_irqrestore(&i2sdev->low_lock, flags); 264 timeout = wait_for_completion_timeout(&done, HZ); 265 spin_lock_irqsave(&i2sdev->low_lock, flags); 266 pi->stop_completion = NULL; 267 if (timeout == 0) { 268 /* timeout expired, stop dbdma forcefully */ 269 printk(KERN_ERR "i2sbus_wait_for_stop: timed out\n"); 270 /* make sure RUN, PAUSE and S0 bits are cleared */ 271 out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16); 272 pi->dbdma_ring.stopping = 0; 273 timeout = 10; 274 while (in_le32(&pi->dbdma->status) & ACTIVE) { 275 if (--timeout <= 0) 276 break; 277 udelay(1); 278 } 279 } 280 } 281 spin_unlock_irqrestore(&i2sdev->low_lock, flags); 282 } 283 284 #ifdef CONFIG_PM 285 void i2sbus_wait_for_stop_both(struct i2sbus_dev *i2sdev) 286 { 287 struct pcm_info *pi; 288 289 get_pcm_info(i2sdev, 0, &pi, NULL); 290 i2sbus_wait_for_stop(i2sdev, pi); 291 get_pcm_info(i2sdev, 1, &pi, NULL); 292 i2sbus_wait_for_stop(i2sdev, pi); 293 } 294 #endif 295 296 static inline int i2sbus_hw_free(struct snd_pcm_substream *substream, int in) 297 { 298 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); 299 struct pcm_info *pi; 300 301 get_pcm_info(i2sdev, in, &pi, NULL); 302 if (pi->dbdma_ring.stopping) 303 i2sbus_wait_for_stop(i2sdev, pi); 304 return 0; 305 } 306 307 static int i2sbus_playback_hw_free(struct snd_pcm_substream *substream) 308 { 309 return i2sbus_hw_free(substream, 0); 310 } 311 312 static int i2sbus_record_hw_free(struct snd_pcm_substream *substream) 313 { 314 return i2sbus_hw_free(substream, 1); 315 } 316 317 static int i2sbus_pcm_prepare(struct i2sbus_dev *i2sdev, int in) 318 { 319 /* whee. Hard work now. The user has selected a bitrate 320 * and bit format, so now we have to program our 321 * I2S controller appropriately. */ 322 struct snd_pcm_runtime *runtime; 323 struct dbdma_cmd *command; 324 int i, periodsize, nperiods; 325 dma_addr_t offset; 326 struct bus_info bi; 327 struct codec_info_item *cii; 328 int sfr = 0; /* serial format register */ 329 int dws = 0; /* data word sizes reg */ 330 int input_16bit; 331 struct pcm_info *pi, *other; 332 int cnt; 333 int result = 0; 334 unsigned int cmd, stopaddr; 335 336 mutex_lock(&i2sdev->lock); 337 338 get_pcm_info(i2sdev, in, &pi, &other); 339 340 if (pi->dbdma_ring.running) { 341 result = -EBUSY; 342 goto out_unlock; 343 } 344 if (pi->dbdma_ring.stopping) 345 i2sbus_wait_for_stop(i2sdev, pi); 346 347 if (!pi->substream || !pi->substream->runtime) { 348 result = -EINVAL; 349 goto out_unlock; 350 } 351 352 runtime = pi->substream->runtime; 353 pi->active = 1; 354 if (other->active && 355 ((i2sdev->format != runtime->format) 356 || (i2sdev->rate != runtime->rate))) { 357 result = -EINVAL; 358 goto out_unlock; 359 } 360 361 i2sdev->format = runtime->format; 362 i2sdev->rate = runtime->rate; 363 364 periodsize = snd_pcm_lib_period_bytes(pi->substream); 365 nperiods = pi->substream->runtime->periods; 366 pi->current_period = 0; 367 368 /* generate dbdma command ring first */ 369 command = pi->dbdma_ring.cmds; 370 memset(command, 0, (nperiods + 2) * sizeof(struct dbdma_cmd)); 371 372 /* commands to DMA to/from the ring */ 373 /* 374 * For input, we need to do a graceful stop; if we abort 375 * the DMA, we end up with leftover bytes that corrupt 376 * the next recording. To do this we set the S0 status 377 * bit and wait for the DMA controller to stop. Each 378 * command has a branch condition to 379 * make it branch to a stop command if S0 is set. 380 * On input we also need to wait for the S7 bit to be 381 * set before turning off the DMA controller. 382 * In fact we do the graceful stop for output as well. 383 */ 384 offset = runtime->dma_addr; 385 cmd = (in? INPUT_MORE: OUTPUT_MORE) | BR_IFSET | INTR_ALWAYS; 386 stopaddr = pi->dbdma_ring.bus_cmd_start + 387 (nperiods + 1) * sizeof(struct dbdma_cmd); 388 for (i = 0; i < nperiods; i++, command++, offset += periodsize) { 389 command->command = cpu_to_le16(cmd); 390 command->cmd_dep = cpu_to_le32(stopaddr); 391 command->phy_addr = cpu_to_le32(offset); 392 command->req_count = cpu_to_le16(periodsize); 393 } 394 395 /* branch back to beginning of ring */ 396 command->command = cpu_to_le16(DBDMA_NOP | BR_ALWAYS); 397 command->cmd_dep = cpu_to_le32(pi->dbdma_ring.bus_cmd_start); 398 command++; 399 400 /* set stop command */ 401 command->command = cpu_to_le16(DBDMA_STOP); 402 403 /* ok, let's set the serial format and stuff */ 404 switch (runtime->format) { 405 /* 16 bit formats */ 406 case SNDRV_PCM_FORMAT_S16_BE: 407 case SNDRV_PCM_FORMAT_U16_BE: 408 /* FIXME: if we add different bus factors we need to 409 * do more here!! */ 410 bi.bus_factor = 0; 411 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) { 412 bi.bus_factor = cii->codec->bus_factor; 413 break; 414 } 415 if (!bi.bus_factor) { 416 result = -ENODEV; 417 goto out_unlock; 418 } 419 input_16bit = 1; 420 break; 421 case SNDRV_PCM_FORMAT_S32_BE: 422 case SNDRV_PCM_FORMAT_U32_BE: 423 /* force 64x bus speed, otherwise the data cannot be 424 * transferred quickly enough! */ 425 bi.bus_factor = 64; 426 input_16bit = 0; 427 break; 428 default: 429 result = -EINVAL; 430 goto out_unlock; 431 } 432 /* we assume all sysclocks are the same! */ 433 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) { 434 bi.sysclock_factor = cii->codec->sysclock_factor; 435 break; 436 } 437 438 if (clock_and_divisors(bi.sysclock_factor, 439 bi.bus_factor, 440 runtime->rate, 441 &sfr) < 0) { 442 result = -EINVAL; 443 goto out_unlock; 444 } 445 switch (bi.bus_factor) { 446 case 32: 447 sfr |= I2S_SF_SERIAL_FORMAT_I2S_32X; 448 break; 449 case 64: 450 sfr |= I2S_SF_SERIAL_FORMAT_I2S_64X; 451 break; 452 } 453 /* FIXME: THIS ASSUMES MASTER ALL THE TIME */ 454 sfr |= I2S_SF_SCLK_MASTER; 455 456 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) { 457 int err = 0; 458 if (cii->codec->prepare) 459 err = cii->codec->prepare(cii, &bi, pi->substream); 460 if (err) { 461 result = err; 462 goto out_unlock; 463 } 464 } 465 /* codecs are fine with it, so set our clocks */ 466 if (input_16bit) 467 dws = (2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) | 468 (2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) | 469 I2S_DWS_DATA_IN_16BIT | I2S_DWS_DATA_OUT_16BIT; 470 else 471 dws = (2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) | 472 (2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) | 473 I2S_DWS_DATA_IN_24BIT | I2S_DWS_DATA_OUT_24BIT; 474 475 /* early exit if already programmed correctly */ 476 /* not locking these is fine since we touch them only in this function */ 477 if (in_le32(&i2sdev->intfregs->serial_format) == sfr 478 && in_le32(&i2sdev->intfregs->data_word_sizes) == dws) 479 goto out_unlock; 480 481 /* let's notify the codecs about clocks going away. 482 * For now we only do mastering on the i2s cell... */ 483 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) 484 if (cii->codec->switch_clock) 485 cii->codec->switch_clock(cii, CLOCK_SWITCH_PREPARE_SLAVE); 486 487 i2sbus_control_enable(i2sdev->control, i2sdev); 488 i2sbus_control_cell(i2sdev->control, i2sdev, 1); 489 490 out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED); 491 492 i2sbus_control_clock(i2sdev->control, i2sdev, 0); 493 494 msleep(1); 495 496 /* wait for clock stopped. This can apparently take a while... */ 497 cnt = 100; 498 while (cnt-- && 499 !(in_le32(&i2sdev->intfregs->intr_ctl) & I2S_PENDING_CLOCKS_STOPPED)) { 500 msleep(5); 501 } 502 out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED); 503 504 /* not locking these is fine since we touch them only in this function */ 505 out_le32(&i2sdev->intfregs->serial_format, sfr); 506 out_le32(&i2sdev->intfregs->data_word_sizes, dws); 507 508 i2sbus_control_enable(i2sdev->control, i2sdev); 509 i2sbus_control_cell(i2sdev->control, i2sdev, 1); 510 i2sbus_control_clock(i2sdev->control, i2sdev, 1); 511 msleep(1); 512 513 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) 514 if (cii->codec->switch_clock) 515 cii->codec->switch_clock(cii, CLOCK_SWITCH_SLAVE); 516 517 out_unlock: 518 mutex_unlock(&i2sdev->lock); 519 return result; 520 } 521 522 #ifdef CONFIG_PM 523 void i2sbus_pcm_prepare_both(struct i2sbus_dev *i2sdev) 524 { 525 i2sbus_pcm_prepare(i2sdev, 0); 526 i2sbus_pcm_prepare(i2sdev, 1); 527 } 528 #endif 529 530 static int i2sbus_pcm_trigger(struct i2sbus_dev *i2sdev, int in, int cmd) 531 { 532 struct codec_info_item *cii; 533 struct pcm_info *pi; 534 int result = 0; 535 unsigned long flags; 536 537 spin_lock_irqsave(&i2sdev->low_lock, flags); 538 539 get_pcm_info(i2sdev, in, &pi, NULL); 540 541 switch (cmd) { 542 case SNDRV_PCM_TRIGGER_START: 543 case SNDRV_PCM_TRIGGER_RESUME: 544 if (pi->dbdma_ring.running) { 545 result = -EALREADY; 546 goto out_unlock; 547 } 548 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) 549 if (cii->codec->start) 550 cii->codec->start(cii, pi->substream); 551 pi->dbdma_ring.running = 1; 552 553 if (pi->dbdma_ring.stopping) { 554 /* Clear the S0 bit, then see if we stopped yet */ 555 out_le32(&pi->dbdma->control, 1 << 16); 556 if (in_le32(&pi->dbdma->status) & ACTIVE) { 557 /* possible race here? */ 558 udelay(10); 559 if (in_le32(&pi->dbdma->status) & ACTIVE) { 560 pi->dbdma_ring.stopping = 0; 561 goto out_unlock; /* keep running */ 562 } 563 } 564 } 565 566 /* make sure RUN, PAUSE and S0 bits are cleared */ 567 out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16); 568 569 /* set branch condition select register */ 570 out_le32(&pi->dbdma->br_sel, (1 << 16) | 1); 571 572 /* write dma command buffer address to the dbdma chip */ 573 out_le32(&pi->dbdma->cmdptr, pi->dbdma_ring.bus_cmd_start); 574 575 /* initialize the frame count and current period */ 576 pi->current_period = 0; 577 pi->frame_count = in_le32(&i2sdev->intfregs->frame_count); 578 579 /* set the DMA controller running */ 580 out_le32(&pi->dbdma->control, (RUN << 16) | RUN); 581 582 /* off you go! */ 583 break; 584 585 case SNDRV_PCM_TRIGGER_STOP: 586 case SNDRV_PCM_TRIGGER_SUSPEND: 587 if (!pi->dbdma_ring.running) { 588 result = -EALREADY; 589 goto out_unlock; 590 } 591 pi->dbdma_ring.running = 0; 592 593 /* Set the S0 bit to make the DMA branch to the stop cmd */ 594 out_le32(&pi->dbdma->control, (1 << 16) | 1); 595 pi->dbdma_ring.stopping = 1; 596 597 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) 598 if (cii->codec->stop) 599 cii->codec->stop(cii, pi->substream); 600 break; 601 default: 602 result = -EINVAL; 603 goto out_unlock; 604 } 605 606 out_unlock: 607 spin_unlock_irqrestore(&i2sdev->low_lock, flags); 608 return result; 609 } 610 611 static snd_pcm_uframes_t i2sbus_pcm_pointer(struct i2sbus_dev *i2sdev, int in) 612 { 613 struct pcm_info *pi; 614 u32 fc; 615 616 get_pcm_info(i2sdev, in, &pi, NULL); 617 618 fc = in_le32(&i2sdev->intfregs->frame_count); 619 fc = fc - pi->frame_count; 620 621 if (fc >= pi->substream->runtime->buffer_size) 622 fc %= pi->substream->runtime->buffer_size; 623 return fc; 624 } 625 626 static inline void handle_interrupt(struct i2sbus_dev *i2sdev, int in) 627 { 628 struct pcm_info *pi; 629 u32 fc, nframes; 630 u32 status; 631 int timeout, i; 632 int dma_stopped = 0; 633 struct snd_pcm_runtime *runtime; 634 635 spin_lock(&i2sdev->low_lock); 636 get_pcm_info(i2sdev, in, &pi, NULL); 637 if (!pi->dbdma_ring.running && !pi->dbdma_ring.stopping) 638 goto out_unlock; 639 640 i = pi->current_period; 641 runtime = pi->substream->runtime; 642 while (pi->dbdma_ring.cmds[i].xfer_status) { 643 if (le16_to_cpu(pi->dbdma_ring.cmds[i].xfer_status) & BT) 644 /* 645 * BT is the branch taken bit. If it took a branch 646 * it is because we set the S0 bit to make it 647 * branch to the stop command. 648 */ 649 dma_stopped = 1; 650 pi->dbdma_ring.cmds[i].xfer_status = 0; 651 652 if (++i >= runtime->periods) { 653 i = 0; 654 pi->frame_count += runtime->buffer_size; 655 } 656 pi->current_period = i; 657 658 /* 659 * Check the frame count. The DMA tends to get a bit 660 * ahead of the frame counter, which confuses the core. 661 */ 662 fc = in_le32(&i2sdev->intfregs->frame_count); 663 nframes = i * runtime->period_size; 664 if (fc < pi->frame_count + nframes) 665 pi->frame_count = fc - nframes; 666 } 667 668 if (dma_stopped) { 669 timeout = 1000; 670 for (;;) { 671 status = in_le32(&pi->dbdma->status); 672 if (!(status & ACTIVE) && (!in || (status & 0x80))) 673 break; 674 if (--timeout <= 0) { 675 printk(KERN_ERR "i2sbus: timed out " 676 "waiting for DMA to stop!\n"); 677 break; 678 } 679 udelay(1); 680 } 681 682 /* Turn off DMA controller, clear S0 bit */ 683 out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16); 684 685 pi->dbdma_ring.stopping = 0; 686 if (pi->stop_completion) 687 complete(pi->stop_completion); 688 } 689 690 if (!pi->dbdma_ring.running) 691 goto out_unlock; 692 spin_unlock(&i2sdev->low_lock); 693 /* may call _trigger again, hence needs to be unlocked */ 694 snd_pcm_period_elapsed(pi->substream); 695 return; 696 697 out_unlock: 698 spin_unlock(&i2sdev->low_lock); 699 } 700 701 irqreturn_t i2sbus_tx_intr(int irq, void *devid) 702 { 703 handle_interrupt((struct i2sbus_dev *)devid, 0); 704 return IRQ_HANDLED; 705 } 706 707 irqreturn_t i2sbus_rx_intr(int irq, void *devid) 708 { 709 handle_interrupt((struct i2sbus_dev *)devid, 1); 710 return IRQ_HANDLED; 711 } 712 713 static int i2sbus_playback_open(struct snd_pcm_substream *substream) 714 { 715 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); 716 717 if (!i2sdev) 718 return -EINVAL; 719 i2sdev->out.substream = substream; 720 return i2sbus_pcm_open(i2sdev, 0); 721 } 722 723 static int i2sbus_playback_close(struct snd_pcm_substream *substream) 724 { 725 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); 726 int err; 727 728 if (!i2sdev) 729 return -EINVAL; 730 if (i2sdev->out.substream != substream) 731 return -EINVAL; 732 err = i2sbus_pcm_close(i2sdev, 0); 733 if (!err) 734 i2sdev->out.substream = NULL; 735 return err; 736 } 737 738 static int i2sbus_playback_prepare(struct snd_pcm_substream *substream) 739 { 740 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); 741 742 if (!i2sdev) 743 return -EINVAL; 744 if (i2sdev->out.substream != substream) 745 return -EINVAL; 746 return i2sbus_pcm_prepare(i2sdev, 0); 747 } 748 749 static int i2sbus_playback_trigger(struct snd_pcm_substream *substream, int cmd) 750 { 751 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); 752 753 if (!i2sdev) 754 return -EINVAL; 755 if (i2sdev->out.substream != substream) 756 return -EINVAL; 757 return i2sbus_pcm_trigger(i2sdev, 0, cmd); 758 } 759 760 static snd_pcm_uframes_t i2sbus_playback_pointer(struct snd_pcm_substream 761 *substream) 762 { 763 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); 764 765 if (!i2sdev) 766 return -EINVAL; 767 if (i2sdev->out.substream != substream) 768 return 0; 769 return i2sbus_pcm_pointer(i2sdev, 0); 770 } 771 772 static const struct snd_pcm_ops i2sbus_playback_ops = { 773 .open = i2sbus_playback_open, 774 .close = i2sbus_playback_close, 775 .hw_free = i2sbus_playback_hw_free, 776 .prepare = i2sbus_playback_prepare, 777 .trigger = i2sbus_playback_trigger, 778 .pointer = i2sbus_playback_pointer, 779 }; 780 781 static int i2sbus_record_open(struct snd_pcm_substream *substream) 782 { 783 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); 784 785 if (!i2sdev) 786 return -EINVAL; 787 i2sdev->in.substream = substream; 788 return i2sbus_pcm_open(i2sdev, 1); 789 } 790 791 static int i2sbus_record_close(struct snd_pcm_substream *substream) 792 { 793 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); 794 int err; 795 796 if (!i2sdev) 797 return -EINVAL; 798 if (i2sdev->in.substream != substream) 799 return -EINVAL; 800 err = i2sbus_pcm_close(i2sdev, 1); 801 if (!err) 802 i2sdev->in.substream = NULL; 803 return err; 804 } 805 806 static int i2sbus_record_prepare(struct snd_pcm_substream *substream) 807 { 808 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); 809 810 if (!i2sdev) 811 return -EINVAL; 812 if (i2sdev->in.substream != substream) 813 return -EINVAL; 814 return i2sbus_pcm_prepare(i2sdev, 1); 815 } 816 817 static int i2sbus_record_trigger(struct snd_pcm_substream *substream, int cmd) 818 { 819 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); 820 821 if (!i2sdev) 822 return -EINVAL; 823 if (i2sdev->in.substream != substream) 824 return -EINVAL; 825 return i2sbus_pcm_trigger(i2sdev, 1, cmd); 826 } 827 828 static snd_pcm_uframes_t i2sbus_record_pointer(struct snd_pcm_substream 829 *substream) 830 { 831 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream); 832 833 if (!i2sdev) 834 return -EINVAL; 835 if (i2sdev->in.substream != substream) 836 return 0; 837 return i2sbus_pcm_pointer(i2sdev, 1); 838 } 839 840 static const struct snd_pcm_ops i2sbus_record_ops = { 841 .open = i2sbus_record_open, 842 .close = i2sbus_record_close, 843 .hw_free = i2sbus_record_hw_free, 844 .prepare = i2sbus_record_prepare, 845 .trigger = i2sbus_record_trigger, 846 .pointer = i2sbus_record_pointer, 847 }; 848 849 static void i2sbus_private_free(struct snd_pcm *pcm) 850 { 851 struct i2sbus_dev *i2sdev = snd_pcm_chip(pcm); 852 struct codec_info_item *p, *tmp; 853 854 i2sdev->sound.pcm = NULL; 855 i2sdev->out.created = 0; 856 i2sdev->in.created = 0; 857 list_for_each_entry_safe(p, tmp, &i2sdev->sound.codec_list, list) { 858 printk(KERN_ERR "i2sbus: a codec didn't unregister!\n"); 859 list_del(&p->list); 860 module_put(p->codec->owner); 861 kfree(p); 862 } 863 soundbus_dev_put(&i2sdev->sound); 864 module_put(THIS_MODULE); 865 } 866 867 int 868 i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card, 869 struct codec_info *ci, void *data) 870 { 871 int err, in = 0, out = 0; 872 struct transfer_info *tmp; 873 struct i2sbus_dev *i2sdev = soundbus_dev_to_i2sbus_dev(dev); 874 struct codec_info_item *cii; 875 876 if (!dev->pcmname || dev->pcmid == -1) { 877 printk(KERN_ERR "i2sbus: pcm name and id must be set!\n"); 878 return -EINVAL; 879 } 880 881 list_for_each_entry(cii, &dev->codec_list, list) { 882 if (cii->codec_data == data) 883 return -EALREADY; 884 } 885 886 if (!ci->transfers || !ci->transfers->formats 887 || !ci->transfers->rates || !ci->usable) 888 return -EINVAL; 889 890 /* we currently code the i2s transfer on the clock, and support only 891 * 32 and 64 */ 892 if (ci->bus_factor != 32 && ci->bus_factor != 64) 893 return -EINVAL; 894 895 /* If you want to fix this, you need to keep track of what transport infos 896 * are to be used, which codecs they belong to, and then fix all the 897 * sysclock/busclock stuff above to depend on which is usable */ 898 list_for_each_entry(cii, &dev->codec_list, list) { 899 if (cii->codec->sysclock_factor != ci->sysclock_factor) { 900 printk(KERN_DEBUG 901 "cannot yet handle multiple different sysclocks!\n"); 902 return -EINVAL; 903 } 904 if (cii->codec->bus_factor != ci->bus_factor) { 905 printk(KERN_DEBUG 906 "cannot yet handle multiple different bus clocks!\n"); 907 return -EINVAL; 908 } 909 } 910 911 tmp = ci->transfers; 912 while (tmp->formats && tmp->rates) { 913 if (tmp->transfer_in) 914 in = 1; 915 else 916 out = 1; 917 tmp++; 918 } 919 920 cii = kzalloc(sizeof(struct codec_info_item), GFP_KERNEL); 921 if (!cii) { 922 printk(KERN_DEBUG "i2sbus: failed to allocate cii\n"); 923 return -ENOMEM; 924 } 925 926 /* use the private data to point to the codec info */ 927 cii->sdev = soundbus_dev_get(dev); 928 cii->codec = ci; 929 cii->codec_data = data; 930 931 if (!cii->sdev) { 932 printk(KERN_DEBUG 933 "i2sbus: failed to get soundbus dev reference\n"); 934 err = -ENODEV; 935 goto out_free_cii; 936 } 937 938 if (!try_module_get(THIS_MODULE)) { 939 printk(KERN_DEBUG "i2sbus: failed to get module reference!\n"); 940 err = -EBUSY; 941 goto out_put_sdev; 942 } 943 944 if (!try_module_get(ci->owner)) { 945 printk(KERN_DEBUG 946 "i2sbus: failed to get module reference to codec owner!\n"); 947 err = -EBUSY; 948 goto out_put_this_module; 949 } 950 951 if (!dev->pcm) { 952 err = snd_pcm_new(card, dev->pcmname, dev->pcmid, 0, 0, 953 &dev->pcm); 954 if (err) { 955 printk(KERN_DEBUG "i2sbus: failed to create pcm\n"); 956 goto out_put_ci_module; 957 } 958 } 959 960 /* ALSA yet again sucks. 961 * If it is ever fixed, remove this line. See below. */ 962 out = in = 1; 963 964 if (!i2sdev->out.created && out) { 965 if (dev->pcm->card != card) { 966 /* eh? */ 967 printk(KERN_ERR 968 "Can't attach same bus to different cards!\n"); 969 err = -EINVAL; 970 goto out_put_ci_module; 971 } 972 err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 1); 973 if (err) 974 goto out_put_ci_module; 975 snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 976 &i2sbus_playback_ops); 977 dev->pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].dev.parent = 978 &dev->ofdev.dev; 979 i2sdev->out.created = 1; 980 } 981 982 if (!i2sdev->in.created && in) { 983 if (dev->pcm->card != card) { 984 printk(KERN_ERR 985 "Can't attach same bus to different cards!\n"); 986 err = -EINVAL; 987 goto out_put_ci_module; 988 } 989 err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 1); 990 if (err) 991 goto out_put_ci_module; 992 snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 993 &i2sbus_record_ops); 994 dev->pcm->streams[SNDRV_PCM_STREAM_CAPTURE].dev.parent = 995 &dev->ofdev.dev; 996 i2sdev->in.created = 1; 997 } 998 999 /* so we have to register the pcm after adding any substream 1000 * to it because alsa doesn't create the devices for the 1001 * substreams when we add them later. 1002 * Therefore, force in and out on both busses (above) and 1003 * register the pcm now instead of just after creating it. 1004 */ 1005 err = snd_device_register(card, dev->pcm); 1006 if (err) { 1007 printk(KERN_ERR "i2sbus: error registering new pcm\n"); 1008 goto out_put_ci_module; 1009 } 1010 /* no errors any more, so let's add this to our list */ 1011 list_add(&cii->list, &dev->codec_list); 1012 1013 dev->pcm->private_data = i2sdev; 1014 dev->pcm->private_free = i2sbus_private_free; 1015 1016 /* well, we really should support scatter/gather DMA */ 1017 snd_pcm_set_managed_buffer_all( 1018 dev->pcm, SNDRV_DMA_TYPE_DEV, 1019 &macio_get_pci_dev(i2sdev->macio)->dev, 1020 64 * 1024, 64 * 1024); 1021 1022 return 0; 1023 out_put_ci_module: 1024 module_put(ci->owner); 1025 out_put_this_module: 1026 module_put(THIS_MODULE); 1027 out_put_sdev: 1028 soundbus_dev_put(dev); 1029 out_free_cii: 1030 kfree(cii); 1031 return err; 1032 } 1033 1034 void i2sbus_detach_codec(struct soundbus_dev *dev, void *data) 1035 { 1036 struct codec_info_item *cii = NULL, *i; 1037 1038 list_for_each_entry(i, &dev->codec_list, list) { 1039 if (i->codec_data == data) { 1040 cii = i; 1041 break; 1042 } 1043 } 1044 if (cii) { 1045 list_del(&cii->list); 1046 module_put(cii->codec->owner); 1047 kfree(cii); 1048 } 1049 /* no more codecs, but still a pcm? */ 1050 if (list_empty(&dev->codec_list) && dev->pcm) { 1051 /* the actual cleanup is done by the callback above! */ 1052 snd_device_free(dev->pcm->card, dev->pcm); 1053 } 1054 } 1055