1 /* 2 * siu_pcm.c - ALSA driver for Renesas SH7343, SH7722 SIU peripheral. 3 * 4 * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de> 5 * Copyright (C) 2006 Carlos Munoz <carlos@kenati.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 #include <linux/delay.h> 22 #include <linux/dma-mapping.h> 23 #include <linux/dmaengine.h> 24 #include <linux/interrupt.h> 25 #include <linux/module.h> 26 #include <linux/platform_device.h> 27 28 #include <sound/control.h> 29 #include <sound/core.h> 30 #include <sound/pcm.h> 31 #include <sound/pcm_params.h> 32 #include <sound/soc.h> 33 34 #include <asm/siu.h> 35 36 #include "siu.h" 37 38 #define GET_MAX_PERIODS(buf_bytes, period_bytes) \ 39 ((buf_bytes) / (period_bytes)) 40 #define PERIOD_OFFSET(buf_addr, period_num, period_bytes) \ 41 ((buf_addr) + ((period_num) * (period_bytes))) 42 43 #define RWF_STM_RD 0x01 /* Read in progress */ 44 #define RWF_STM_WT 0x02 /* Write in progress */ 45 46 struct siu_port *siu_ports[SIU_PORT_NUM]; 47 48 /* transfersize is number of u32 dma transfers per period */ 49 static int siu_pcm_stmwrite_stop(struct siu_port *port_info) 50 { 51 struct siu_info *info = siu_i2s_data; 52 u32 __iomem *base = info->reg; 53 struct siu_stream *siu_stream = &port_info->playback; 54 u32 stfifo; 55 56 if (!siu_stream->rw_flg) 57 return -EPERM; 58 59 /* output FIFO disable */ 60 stfifo = siu_read32(base + SIU_STFIFO); 61 siu_write32(base + SIU_STFIFO, stfifo & ~0x0c180c18); 62 pr_debug("%s: STFIFO %x -> %x\n", __func__, 63 stfifo, stfifo & ~0x0c180c18); 64 65 /* during stmwrite clear */ 66 siu_stream->rw_flg = 0; 67 68 return 0; 69 } 70 71 static int siu_pcm_stmwrite_start(struct siu_port *port_info) 72 { 73 struct siu_stream *siu_stream = &port_info->playback; 74 75 if (siu_stream->rw_flg) 76 return -EPERM; 77 78 /* Current period in buffer */ 79 port_info->playback.cur_period = 0; 80 81 /* during stmwrite flag set */ 82 siu_stream->rw_flg = RWF_STM_WT; 83 84 /* DMA transfer start */ 85 tasklet_schedule(&siu_stream->tasklet); 86 87 return 0; 88 } 89 90 static void siu_dma_tx_complete(void *arg) 91 { 92 struct siu_stream *siu_stream = arg; 93 94 if (!siu_stream->rw_flg) 95 return; 96 97 /* Update completed period count */ 98 if (++siu_stream->cur_period >= 99 GET_MAX_PERIODS(siu_stream->buf_bytes, 100 siu_stream->period_bytes)) 101 siu_stream->cur_period = 0; 102 103 pr_debug("%s: done period #%d (%u/%u bytes), cookie %d\n", 104 __func__, siu_stream->cur_period, 105 siu_stream->cur_period * siu_stream->period_bytes, 106 siu_stream->buf_bytes, siu_stream->cookie); 107 108 tasklet_schedule(&siu_stream->tasklet); 109 110 /* Notify alsa: a period is done */ 111 snd_pcm_period_elapsed(siu_stream->substream); 112 } 113 114 static int siu_pcm_wr_set(struct siu_port *port_info, 115 dma_addr_t buff, u32 size) 116 { 117 struct siu_info *info = siu_i2s_data; 118 u32 __iomem *base = info->reg; 119 struct siu_stream *siu_stream = &port_info->playback; 120 struct snd_pcm_substream *substream = siu_stream->substream; 121 struct device *dev = substream->pcm->card->dev; 122 struct dma_async_tx_descriptor *desc; 123 dma_cookie_t cookie; 124 struct scatterlist sg; 125 u32 stfifo; 126 127 sg_init_table(&sg, 1); 128 sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)), 129 size, offset_in_page(buff)); 130 sg_dma_len(&sg) = size; 131 sg_dma_address(&sg) = buff; 132 133 desc = dmaengine_prep_slave_sg(siu_stream->chan, 134 &sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 135 if (!desc) { 136 dev_err(dev, "Failed to allocate a dma descriptor\n"); 137 return -ENOMEM; 138 } 139 140 desc->callback = siu_dma_tx_complete; 141 desc->callback_param = siu_stream; 142 cookie = dmaengine_submit(desc); 143 if (cookie < 0) { 144 dev_err(dev, "Failed to submit a dma transfer\n"); 145 return cookie; 146 } 147 148 siu_stream->tx_desc = desc; 149 siu_stream->cookie = cookie; 150 151 dma_async_issue_pending(siu_stream->chan); 152 153 /* only output FIFO enable */ 154 stfifo = siu_read32(base + SIU_STFIFO); 155 siu_write32(base + SIU_STFIFO, stfifo | (port_info->stfifo & 0x0c180c18)); 156 dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__, 157 stfifo, stfifo | (port_info->stfifo & 0x0c180c18)); 158 159 return 0; 160 } 161 162 static int siu_pcm_rd_set(struct siu_port *port_info, 163 dma_addr_t buff, size_t size) 164 { 165 struct siu_info *info = siu_i2s_data; 166 u32 __iomem *base = info->reg; 167 struct siu_stream *siu_stream = &port_info->capture; 168 struct snd_pcm_substream *substream = siu_stream->substream; 169 struct device *dev = substream->pcm->card->dev; 170 struct dma_async_tx_descriptor *desc; 171 dma_cookie_t cookie; 172 struct scatterlist sg; 173 u32 stfifo; 174 175 dev_dbg(dev, "%s: %u@%llx\n", __func__, size, (unsigned long long)buff); 176 177 sg_init_table(&sg, 1); 178 sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)), 179 size, offset_in_page(buff)); 180 sg_dma_len(&sg) = size; 181 sg_dma_address(&sg) = buff; 182 183 desc = dmaengine_prep_slave_sg(siu_stream->chan, 184 &sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 185 if (!desc) { 186 dev_err(dev, "Failed to allocate dma descriptor\n"); 187 return -ENOMEM; 188 } 189 190 desc->callback = siu_dma_tx_complete; 191 desc->callback_param = siu_stream; 192 cookie = dmaengine_submit(desc); 193 if (cookie < 0) { 194 dev_err(dev, "Failed to submit dma descriptor\n"); 195 return cookie; 196 } 197 198 siu_stream->tx_desc = desc; 199 siu_stream->cookie = cookie; 200 201 dma_async_issue_pending(siu_stream->chan); 202 203 /* only input FIFO enable */ 204 stfifo = siu_read32(base + SIU_STFIFO); 205 siu_write32(base + SIU_STFIFO, siu_read32(base + SIU_STFIFO) | 206 (port_info->stfifo & 0x13071307)); 207 dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__, 208 stfifo, stfifo | (port_info->stfifo & 0x13071307)); 209 210 return 0; 211 } 212 213 static void siu_io_tasklet(unsigned long data) 214 { 215 struct siu_stream *siu_stream = (struct siu_stream *)data; 216 struct snd_pcm_substream *substream = siu_stream->substream; 217 struct device *dev = substream->pcm->card->dev; 218 struct snd_pcm_runtime *rt = substream->runtime; 219 struct siu_port *port_info = siu_port_info(substream); 220 221 dev_dbg(dev, "%s: flags %x\n", __func__, siu_stream->rw_flg); 222 223 if (!siu_stream->rw_flg) { 224 dev_dbg(dev, "%s: stream inactive\n", __func__); 225 return; 226 } 227 228 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 229 dma_addr_t buff; 230 size_t count; 231 u8 *virt; 232 233 buff = (dma_addr_t)PERIOD_OFFSET(rt->dma_addr, 234 siu_stream->cur_period, 235 siu_stream->period_bytes); 236 virt = PERIOD_OFFSET(rt->dma_area, 237 siu_stream->cur_period, 238 siu_stream->period_bytes); 239 count = siu_stream->period_bytes; 240 241 /* DMA transfer start */ 242 siu_pcm_rd_set(port_info, buff, count); 243 } else { 244 siu_pcm_wr_set(port_info, 245 (dma_addr_t)PERIOD_OFFSET(rt->dma_addr, 246 siu_stream->cur_period, 247 siu_stream->period_bytes), 248 siu_stream->period_bytes); 249 } 250 } 251 252 /* Capture */ 253 static int siu_pcm_stmread_start(struct siu_port *port_info) 254 { 255 struct siu_stream *siu_stream = &port_info->capture; 256 257 if (siu_stream->xfer_cnt > 0x1000000) 258 return -EINVAL; 259 if (siu_stream->rw_flg) 260 return -EPERM; 261 262 /* Current period in buffer */ 263 siu_stream->cur_period = 0; 264 265 /* during stmread flag set */ 266 siu_stream->rw_flg = RWF_STM_RD; 267 268 tasklet_schedule(&siu_stream->tasklet); 269 270 return 0; 271 } 272 273 static int siu_pcm_stmread_stop(struct siu_port *port_info) 274 { 275 struct siu_info *info = siu_i2s_data; 276 u32 __iomem *base = info->reg; 277 struct siu_stream *siu_stream = &port_info->capture; 278 struct device *dev = siu_stream->substream->pcm->card->dev; 279 u32 stfifo; 280 281 if (!siu_stream->rw_flg) 282 return -EPERM; 283 284 /* input FIFO disable */ 285 stfifo = siu_read32(base + SIU_STFIFO); 286 siu_write32(base + SIU_STFIFO, stfifo & ~0x13071307); 287 dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__, 288 stfifo, stfifo & ~0x13071307); 289 290 /* during stmread flag clear */ 291 siu_stream->rw_flg = 0; 292 293 return 0; 294 } 295 296 static int siu_pcm_hw_params(struct snd_pcm_substream *ss, 297 struct snd_pcm_hw_params *hw_params) 298 { 299 struct siu_info *info = siu_i2s_data; 300 struct device *dev = ss->pcm->card->dev; 301 int ret; 302 303 dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id); 304 305 ret = snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params)); 306 if (ret < 0) 307 dev_err(dev, "snd_pcm_lib_malloc_pages() failed\n"); 308 309 return ret; 310 } 311 312 static int siu_pcm_hw_free(struct snd_pcm_substream *ss) 313 { 314 struct siu_info *info = siu_i2s_data; 315 struct siu_port *port_info = siu_port_info(ss); 316 struct device *dev = ss->pcm->card->dev; 317 struct siu_stream *siu_stream; 318 319 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) 320 siu_stream = &port_info->playback; 321 else 322 siu_stream = &port_info->capture; 323 324 dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id); 325 326 return snd_pcm_lib_free_pages(ss); 327 } 328 329 static bool filter(struct dma_chan *chan, void *slave) 330 { 331 struct sh_dmae_slave *param = slave; 332 333 pr_debug("%s: slave ID %d\n", __func__, param->shdma_slave.slave_id); 334 335 chan->private = ¶m->shdma_slave; 336 return true; 337 } 338 339 static int siu_pcm_open(struct snd_pcm_substream *ss) 340 { 341 /* Playback / Capture */ 342 struct snd_soc_pcm_runtime *rtd = ss->private_data; 343 struct siu_platform *pdata = rtd->platform->dev->platform_data; 344 struct siu_info *info = siu_i2s_data; 345 struct siu_port *port_info = siu_port_info(ss); 346 struct siu_stream *siu_stream; 347 u32 port = info->port_id; 348 struct device *dev = ss->pcm->card->dev; 349 dma_cap_mask_t mask; 350 struct sh_dmae_slave *param; 351 352 dma_cap_zero(mask); 353 dma_cap_set(DMA_SLAVE, mask); 354 355 dev_dbg(dev, "%s, port=%d@%p\n", __func__, port, port_info); 356 357 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) { 358 siu_stream = &port_info->playback; 359 param = &siu_stream->param; 360 param->shdma_slave.slave_id = port ? pdata->dma_slave_tx_b : 361 pdata->dma_slave_tx_a; 362 } else { 363 siu_stream = &port_info->capture; 364 param = &siu_stream->param; 365 param->shdma_slave.slave_id = port ? pdata->dma_slave_rx_b : 366 pdata->dma_slave_rx_a; 367 } 368 369 /* Get DMA channel */ 370 siu_stream->chan = dma_request_channel(mask, filter, param); 371 if (!siu_stream->chan) { 372 dev_err(dev, "DMA channel allocation failed!\n"); 373 return -EBUSY; 374 } 375 376 siu_stream->substream = ss; 377 378 return 0; 379 } 380 381 static int siu_pcm_close(struct snd_pcm_substream *ss) 382 { 383 struct siu_info *info = siu_i2s_data; 384 struct device *dev = ss->pcm->card->dev; 385 struct siu_port *port_info = siu_port_info(ss); 386 struct siu_stream *siu_stream; 387 388 dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id); 389 390 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) 391 siu_stream = &port_info->playback; 392 else 393 siu_stream = &port_info->capture; 394 395 dma_release_channel(siu_stream->chan); 396 siu_stream->chan = NULL; 397 398 siu_stream->substream = NULL; 399 400 return 0; 401 } 402 403 static int siu_pcm_prepare(struct snd_pcm_substream *ss) 404 { 405 struct siu_info *info = siu_i2s_data; 406 struct siu_port *port_info = siu_port_info(ss); 407 struct device *dev = ss->pcm->card->dev; 408 struct snd_pcm_runtime *rt = ss->runtime; 409 struct siu_stream *siu_stream; 410 snd_pcm_sframes_t xfer_cnt; 411 412 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) 413 siu_stream = &port_info->playback; 414 else 415 siu_stream = &port_info->capture; 416 417 rt = siu_stream->substream->runtime; 418 419 siu_stream->buf_bytes = snd_pcm_lib_buffer_bytes(ss); 420 siu_stream->period_bytes = snd_pcm_lib_period_bytes(ss); 421 422 dev_dbg(dev, "%s: port=%d, %d channels, period=%u bytes\n", __func__, 423 info->port_id, rt->channels, siu_stream->period_bytes); 424 425 /* We only support buffers that are multiples of the period */ 426 if (siu_stream->buf_bytes % siu_stream->period_bytes) { 427 dev_err(dev, "%s() - buffer=%d not multiple of period=%d\n", 428 __func__, siu_stream->buf_bytes, 429 siu_stream->period_bytes); 430 return -EINVAL; 431 } 432 433 xfer_cnt = bytes_to_frames(rt, siu_stream->period_bytes); 434 if (!xfer_cnt || xfer_cnt > 0x1000000) 435 return -EINVAL; 436 437 siu_stream->format = rt->format; 438 siu_stream->xfer_cnt = xfer_cnt; 439 440 dev_dbg(dev, "port=%d buf=%lx buf_bytes=%d period_bytes=%d " 441 "format=%d channels=%d xfer_cnt=%d\n", info->port_id, 442 (unsigned long)rt->dma_addr, siu_stream->buf_bytes, 443 siu_stream->period_bytes, 444 siu_stream->format, rt->channels, (int)xfer_cnt); 445 446 return 0; 447 } 448 449 static int siu_pcm_trigger(struct snd_pcm_substream *ss, int cmd) 450 { 451 struct siu_info *info = siu_i2s_data; 452 struct device *dev = ss->pcm->card->dev; 453 struct siu_port *port_info = siu_port_info(ss); 454 int ret; 455 456 dev_dbg(dev, "%s: port=%d@%p, cmd=%d\n", __func__, 457 info->port_id, port_info, cmd); 458 459 switch (cmd) { 460 case SNDRV_PCM_TRIGGER_START: 461 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) 462 ret = siu_pcm_stmwrite_start(port_info); 463 else 464 ret = siu_pcm_stmread_start(port_info); 465 466 if (ret < 0) 467 dev_warn(dev, "%s: start failed on port=%d\n", 468 __func__, info->port_id); 469 470 break; 471 case SNDRV_PCM_TRIGGER_STOP: 472 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) 473 siu_pcm_stmwrite_stop(port_info); 474 else 475 siu_pcm_stmread_stop(port_info); 476 ret = 0; 477 478 break; 479 default: 480 dev_err(dev, "%s() unsupported cmd=%d\n", __func__, cmd); 481 ret = -EINVAL; 482 } 483 484 return ret; 485 } 486 487 /* 488 * So far only resolution of one period is supported, subject to extending the 489 * dmangine API 490 */ 491 static snd_pcm_uframes_t siu_pcm_pointer_dma(struct snd_pcm_substream *ss) 492 { 493 struct device *dev = ss->pcm->card->dev; 494 struct siu_info *info = siu_i2s_data; 495 u32 __iomem *base = info->reg; 496 struct siu_port *port_info = siu_port_info(ss); 497 struct snd_pcm_runtime *rt = ss->runtime; 498 size_t ptr; 499 struct siu_stream *siu_stream; 500 501 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) 502 siu_stream = &port_info->playback; 503 else 504 siu_stream = &port_info->capture; 505 506 /* 507 * ptr is the offset into the buffer where the dma is currently at. We 508 * check if the dma buffer has just wrapped. 509 */ 510 ptr = PERIOD_OFFSET(rt->dma_addr, 511 siu_stream->cur_period, 512 siu_stream->period_bytes) - rt->dma_addr; 513 514 dev_dbg(dev, 515 "%s: port=%d, events %x, FSTS %x, xferred %u/%u, cookie %d\n", 516 __func__, info->port_id, siu_read32(base + SIU_EVNTC), 517 siu_read32(base + SIU_SBFSTS), ptr, siu_stream->buf_bytes, 518 siu_stream->cookie); 519 520 if (ptr >= siu_stream->buf_bytes) 521 ptr = 0; 522 523 return bytes_to_frames(ss->runtime, ptr); 524 } 525 526 static int siu_pcm_new(struct snd_soc_pcm_runtime *rtd) 527 { 528 /* card->dev == socdev->dev, see snd_soc_new_pcms() */ 529 struct snd_card *card = rtd->card->snd_card; 530 struct snd_pcm *pcm = rtd->pcm; 531 struct siu_info *info = siu_i2s_data; 532 struct platform_device *pdev = to_platform_device(card->dev); 533 int ret; 534 int i; 535 536 /* pdev->id selects between SIUA and SIUB */ 537 if (pdev->id < 0 || pdev->id >= SIU_PORT_NUM) 538 return -EINVAL; 539 540 info->port_id = pdev->id; 541 542 /* 543 * While the siu has 2 ports, only one port can be on at a time (only 1 544 * SPB). So far all the boards using the siu had only one of the ports 545 * wired to a codec. To simplify things, we only register one port with 546 * alsa. In case both ports are needed, it should be changed here 547 */ 548 for (i = pdev->id; i < pdev->id + 1; i++) { 549 struct siu_port **port_info = &siu_ports[i]; 550 551 ret = siu_init_port(i, port_info, card); 552 if (ret < 0) 553 return ret; 554 555 ret = snd_pcm_lib_preallocate_pages_for_all(pcm, 556 SNDRV_DMA_TYPE_DEV, NULL, 557 SIU_BUFFER_BYTES_MAX, SIU_BUFFER_BYTES_MAX); 558 if (ret < 0) { 559 dev_err(card->dev, 560 "snd_pcm_lib_preallocate_pages_for_all() err=%d", 561 ret); 562 goto fail; 563 } 564 565 (*port_info)->pcm = pcm; 566 567 /* IO tasklets */ 568 tasklet_init(&(*port_info)->playback.tasklet, siu_io_tasklet, 569 (unsigned long)&(*port_info)->playback); 570 tasklet_init(&(*port_info)->capture.tasklet, siu_io_tasklet, 571 (unsigned long)&(*port_info)->capture); 572 } 573 574 dev_info(card->dev, "SuperH SIU driver initialized.\n"); 575 return 0; 576 577 fail: 578 siu_free_port(siu_ports[pdev->id]); 579 dev_err(card->dev, "SIU: failed to initialize.\n"); 580 return ret; 581 } 582 583 static void siu_pcm_free(struct snd_pcm *pcm) 584 { 585 struct platform_device *pdev = to_platform_device(pcm->card->dev); 586 struct siu_port *port_info = siu_ports[pdev->id]; 587 588 tasklet_kill(&port_info->capture.tasklet); 589 tasklet_kill(&port_info->playback.tasklet); 590 591 siu_free_port(port_info); 592 snd_pcm_lib_preallocate_free_for_all(pcm); 593 594 dev_dbg(pcm->card->dev, "%s\n", __func__); 595 } 596 597 static struct snd_pcm_ops siu_pcm_ops = { 598 .open = siu_pcm_open, 599 .close = siu_pcm_close, 600 .ioctl = snd_pcm_lib_ioctl, 601 .hw_params = siu_pcm_hw_params, 602 .hw_free = siu_pcm_hw_free, 603 .prepare = siu_pcm_prepare, 604 .trigger = siu_pcm_trigger, 605 .pointer = siu_pcm_pointer_dma, 606 }; 607 608 struct snd_soc_platform_driver siu_platform = { 609 .ops = &siu_pcm_ops, 610 .pcm_new = siu_pcm_new, 611 .pcm_free = siu_pcm_free, 612 }; 613 EXPORT_SYMBOL_GPL(siu_platform); 614