1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // siu_pcm.c - ALSA driver for Renesas SH7343, SH7722 SIU peripheral. 4 // 5 // Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de> 6 // Copyright (C) 2006 Carlos Munoz <carlos@kenati.com> 7 8 #include <linux/delay.h> 9 #include <linux/dma-mapping.h> 10 #include <linux/dmaengine.h> 11 #include <linux/interrupt.h> 12 #include <linux/module.h> 13 #include <linux/platform_device.h> 14 15 #include <sound/control.h> 16 #include <sound/core.h> 17 #include <sound/pcm.h> 18 #include <sound/pcm_params.h> 19 #include <sound/soc.h> 20 21 #include <asm/siu.h> 22 23 #include "siu.h" 24 25 #define DRV_NAME "siu-i2s" 26 #define GET_MAX_PERIODS(buf_bytes, period_bytes) \ 27 ((buf_bytes) / (period_bytes)) 28 #define PERIOD_OFFSET(buf_addr, period_num, period_bytes) \ 29 ((buf_addr) + ((period_num) * (period_bytes))) 30 31 #define RWF_STM_RD 0x01 /* Read in progress */ 32 #define RWF_STM_WT 0x02 /* Write in progress */ 33 34 struct siu_port *siu_ports[SIU_PORT_NUM]; 35 36 /* transfersize is number of u32 dma transfers per period */ 37 static int siu_pcm_stmwrite_stop(struct siu_port *port_info) 38 { 39 struct siu_info *info = siu_i2s_data; 40 u32 __iomem *base = info->reg; 41 struct siu_stream *siu_stream = &port_info->playback; 42 u32 stfifo; 43 44 if (!siu_stream->rw_flg) 45 return -EPERM; 46 47 /* output FIFO disable */ 48 stfifo = siu_read32(base + SIU_STFIFO); 49 siu_write32(base + SIU_STFIFO, stfifo & ~0x0c180c18); 50 pr_debug("%s: STFIFO %x -> %x\n", __func__, 51 stfifo, stfifo & ~0x0c180c18); 52 53 /* during stmwrite clear */ 54 siu_stream->rw_flg = 0; 55 56 return 0; 57 } 58 59 static int siu_pcm_stmwrite_start(struct siu_port *port_info) 60 { 61 struct siu_stream *siu_stream = &port_info->playback; 62 63 if (siu_stream->rw_flg) 64 return -EPERM; 65 66 /* Current period in buffer */ 67 port_info->playback.cur_period = 0; 68 69 /* during stmwrite flag set */ 70 siu_stream->rw_flg = RWF_STM_WT; 71 72 /* DMA transfer start */ 73 queue_work(system_highpri_wq, &siu_stream->work); 74 75 return 0; 76 } 77 78 static void siu_dma_tx_complete(void *arg) 79 { 80 struct siu_stream *siu_stream = arg; 81 82 if (!siu_stream->rw_flg) 83 return; 84 85 /* Update completed period count */ 86 if (++siu_stream->cur_period >= 87 GET_MAX_PERIODS(siu_stream->buf_bytes, 88 siu_stream->period_bytes)) 89 siu_stream->cur_period = 0; 90 91 pr_debug("%s: done period #%d (%u/%u bytes), cookie %d\n", 92 __func__, siu_stream->cur_period, 93 siu_stream->cur_period * siu_stream->period_bytes, 94 siu_stream->buf_bytes, siu_stream->cookie); 95 96 queue_work(system_highpri_wq, &siu_stream->work); 97 98 /* Notify alsa: a period is done */ 99 snd_pcm_period_elapsed(siu_stream->substream); 100 } 101 102 static int siu_pcm_wr_set(struct siu_port *port_info, 103 dma_addr_t buff, u32 size) 104 { 105 struct siu_info *info = siu_i2s_data; 106 u32 __iomem *base = info->reg; 107 struct siu_stream *siu_stream = &port_info->playback; 108 struct snd_pcm_substream *substream = siu_stream->substream; 109 struct device *dev = substream->pcm->card->dev; 110 struct dma_async_tx_descriptor *desc; 111 dma_cookie_t cookie; 112 struct scatterlist sg; 113 u32 stfifo; 114 115 sg_init_table(&sg, 1); 116 sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)), 117 size, offset_in_page(buff)); 118 sg_dma_len(&sg) = size; 119 sg_dma_address(&sg) = buff; 120 121 desc = dmaengine_prep_slave_sg(siu_stream->chan, 122 &sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 123 if (!desc) { 124 dev_err(dev, "Failed to allocate a dma descriptor\n"); 125 return -ENOMEM; 126 } 127 128 desc->callback = siu_dma_tx_complete; 129 desc->callback_param = siu_stream; 130 cookie = dmaengine_submit(desc); 131 if (cookie < 0) { 132 dev_err(dev, "Failed to submit a dma transfer\n"); 133 return cookie; 134 } 135 136 siu_stream->tx_desc = desc; 137 siu_stream->cookie = cookie; 138 139 dma_async_issue_pending(siu_stream->chan); 140 141 /* only output FIFO enable */ 142 stfifo = siu_read32(base + SIU_STFIFO); 143 siu_write32(base + SIU_STFIFO, stfifo | (port_info->stfifo & 0x0c180c18)); 144 dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__, 145 stfifo, stfifo | (port_info->stfifo & 0x0c180c18)); 146 147 return 0; 148 } 149 150 static int siu_pcm_rd_set(struct siu_port *port_info, 151 dma_addr_t buff, size_t size) 152 { 153 struct siu_info *info = siu_i2s_data; 154 u32 __iomem *base = info->reg; 155 struct siu_stream *siu_stream = &port_info->capture; 156 struct snd_pcm_substream *substream = siu_stream->substream; 157 struct device *dev = substream->pcm->card->dev; 158 struct dma_async_tx_descriptor *desc; 159 dma_cookie_t cookie; 160 struct scatterlist sg; 161 u32 stfifo; 162 163 dev_dbg(dev, "%s: %u@%llx\n", __func__, size, (unsigned long long)buff); 164 165 sg_init_table(&sg, 1); 166 sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)), 167 size, offset_in_page(buff)); 168 sg_dma_len(&sg) = size; 169 sg_dma_address(&sg) = buff; 170 171 desc = dmaengine_prep_slave_sg(siu_stream->chan, 172 &sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 173 if (!desc) { 174 dev_err(dev, "Failed to allocate dma descriptor\n"); 175 return -ENOMEM; 176 } 177 178 desc->callback = siu_dma_tx_complete; 179 desc->callback_param = siu_stream; 180 cookie = dmaengine_submit(desc); 181 if (cookie < 0) { 182 dev_err(dev, "Failed to submit dma descriptor\n"); 183 return cookie; 184 } 185 186 siu_stream->tx_desc = desc; 187 siu_stream->cookie = cookie; 188 189 dma_async_issue_pending(siu_stream->chan); 190 191 /* only input FIFO enable */ 192 stfifo = siu_read32(base + SIU_STFIFO); 193 siu_write32(base + SIU_STFIFO, siu_read32(base + SIU_STFIFO) | 194 (port_info->stfifo & 0x13071307)); 195 dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__, 196 stfifo, stfifo | (port_info->stfifo & 0x13071307)); 197 198 return 0; 199 } 200 201 static void siu_io_work(struct work_struct *work) 202 { 203 struct siu_stream *siu_stream = container_of(work, struct siu_stream, 204 work); 205 struct snd_pcm_substream *substream = siu_stream->substream; 206 struct device *dev = substream->pcm->card->dev; 207 struct snd_pcm_runtime *rt = substream->runtime; 208 struct siu_port *port_info = siu_port_info(substream); 209 210 dev_dbg(dev, "%s: flags %x\n", __func__, siu_stream->rw_flg); 211 212 if (!siu_stream->rw_flg) { 213 dev_dbg(dev, "%s: stream inactive\n", __func__); 214 return; 215 } 216 217 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 218 dma_addr_t buff; 219 size_t count; 220 u8 *virt; 221 222 buff = (dma_addr_t)PERIOD_OFFSET(rt->dma_addr, 223 siu_stream->cur_period, 224 siu_stream->period_bytes); 225 virt = PERIOD_OFFSET(rt->dma_area, 226 siu_stream->cur_period, 227 siu_stream->period_bytes); 228 count = siu_stream->period_bytes; 229 230 /* DMA transfer start */ 231 siu_pcm_rd_set(port_info, buff, count); 232 } else { 233 siu_pcm_wr_set(port_info, 234 (dma_addr_t)PERIOD_OFFSET(rt->dma_addr, 235 siu_stream->cur_period, 236 siu_stream->period_bytes), 237 siu_stream->period_bytes); 238 } 239 } 240 241 /* Capture */ 242 static int siu_pcm_stmread_start(struct siu_port *port_info) 243 { 244 struct siu_stream *siu_stream = &port_info->capture; 245 246 if (siu_stream->xfer_cnt > 0x1000000) 247 return -EINVAL; 248 if (siu_stream->rw_flg) 249 return -EPERM; 250 251 /* Current period in buffer */ 252 siu_stream->cur_period = 0; 253 254 /* during stmread flag set */ 255 siu_stream->rw_flg = RWF_STM_RD; 256 257 queue_work(system_highpri_wq, &siu_stream->work); 258 259 return 0; 260 } 261 262 static int siu_pcm_stmread_stop(struct siu_port *port_info) 263 { 264 struct siu_info *info = siu_i2s_data; 265 u32 __iomem *base = info->reg; 266 struct siu_stream *siu_stream = &port_info->capture; 267 struct device *dev = siu_stream->substream->pcm->card->dev; 268 u32 stfifo; 269 270 if (!siu_stream->rw_flg) 271 return -EPERM; 272 273 /* input FIFO disable */ 274 stfifo = siu_read32(base + SIU_STFIFO); 275 siu_write32(base + SIU_STFIFO, stfifo & ~0x13071307); 276 dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__, 277 stfifo, stfifo & ~0x13071307); 278 279 /* during stmread flag clear */ 280 siu_stream->rw_flg = 0; 281 282 return 0; 283 } 284 285 static bool filter(struct dma_chan *chan, void *secondary) 286 { 287 struct sh_dmae_slave *param = secondary; 288 289 pr_debug("%s: secondary ID %d\n", __func__, param->shdma_slave.slave_id); 290 291 chan->private = ¶m->shdma_slave; 292 return true; 293 } 294 295 static int siu_pcm_open(struct snd_soc_component *component, 296 struct snd_pcm_substream *ss) 297 { 298 /* Playback / Capture */ 299 struct siu_platform *pdata = component->dev->platform_data; 300 struct siu_info *info = siu_i2s_data; 301 struct siu_port *port_info = siu_port_info(ss); 302 struct siu_stream *siu_stream; 303 u32 port = info->port_id; 304 struct device *dev = ss->pcm->card->dev; 305 dma_cap_mask_t mask; 306 struct sh_dmae_slave *param; 307 308 dma_cap_zero(mask); 309 dma_cap_set(DMA_SLAVE, mask); 310 311 dev_dbg(dev, "%s, port=%d@%p\n", __func__, port, port_info); 312 313 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) { 314 siu_stream = &port_info->playback; 315 param = &siu_stream->param; 316 param->shdma_slave.slave_id = port ? pdata->dma_slave_tx_b : 317 pdata->dma_slave_tx_a; 318 } else { 319 siu_stream = &port_info->capture; 320 param = &siu_stream->param; 321 param->shdma_slave.slave_id = port ? pdata->dma_slave_rx_b : 322 pdata->dma_slave_rx_a; 323 } 324 325 /* Get DMA channel */ 326 siu_stream->chan = dma_request_channel(mask, filter, param); 327 if (!siu_stream->chan) { 328 dev_err(dev, "DMA channel allocation failed!\n"); 329 return -EBUSY; 330 } 331 332 siu_stream->substream = ss; 333 334 return 0; 335 } 336 337 static int siu_pcm_close(struct snd_soc_component *component, 338 struct snd_pcm_substream *ss) 339 { 340 struct siu_info *info = siu_i2s_data; 341 struct device *dev = ss->pcm->card->dev; 342 struct siu_port *port_info = siu_port_info(ss); 343 struct siu_stream *siu_stream; 344 345 dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id); 346 347 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) 348 siu_stream = &port_info->playback; 349 else 350 siu_stream = &port_info->capture; 351 352 dma_release_channel(siu_stream->chan); 353 siu_stream->chan = NULL; 354 355 siu_stream->substream = NULL; 356 357 return 0; 358 } 359 360 static int siu_pcm_prepare(struct snd_soc_component *component, 361 struct snd_pcm_substream *ss) 362 { 363 struct siu_info *info = siu_i2s_data; 364 struct siu_port *port_info = siu_port_info(ss); 365 struct device *dev = ss->pcm->card->dev; 366 struct snd_pcm_runtime *rt = ss->runtime; 367 struct siu_stream *siu_stream; 368 snd_pcm_sframes_t xfer_cnt; 369 370 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) 371 siu_stream = &port_info->playback; 372 else 373 siu_stream = &port_info->capture; 374 375 rt = siu_stream->substream->runtime; 376 377 siu_stream->buf_bytes = snd_pcm_lib_buffer_bytes(ss); 378 siu_stream->period_bytes = snd_pcm_lib_period_bytes(ss); 379 380 dev_dbg(dev, "%s: port=%d, %d channels, period=%u bytes\n", __func__, 381 info->port_id, rt->channels, siu_stream->period_bytes); 382 383 /* We only support buffers that are multiples of the period */ 384 if (siu_stream->buf_bytes % siu_stream->period_bytes) { 385 dev_err(dev, "%s() - buffer=%d not multiple of period=%d\n", 386 __func__, siu_stream->buf_bytes, 387 siu_stream->period_bytes); 388 return -EINVAL; 389 } 390 391 xfer_cnt = bytes_to_frames(rt, siu_stream->period_bytes); 392 if (!xfer_cnt || xfer_cnt > 0x1000000) 393 return -EINVAL; 394 395 siu_stream->format = rt->format; 396 siu_stream->xfer_cnt = xfer_cnt; 397 398 dev_dbg(dev, "port=%d buf=%lx buf_bytes=%d period_bytes=%d " 399 "format=%d channels=%d xfer_cnt=%d\n", info->port_id, 400 (unsigned long)rt->dma_addr, siu_stream->buf_bytes, 401 siu_stream->period_bytes, 402 siu_stream->format, rt->channels, (int)xfer_cnt); 403 404 return 0; 405 } 406 407 static int siu_pcm_trigger(struct snd_soc_component *component, 408 struct snd_pcm_substream *ss, int cmd) 409 { 410 struct siu_info *info = siu_i2s_data; 411 struct device *dev = ss->pcm->card->dev; 412 struct siu_port *port_info = siu_port_info(ss); 413 int ret; 414 415 dev_dbg(dev, "%s: port=%d@%p, cmd=%d\n", __func__, 416 info->port_id, port_info, cmd); 417 418 switch (cmd) { 419 case SNDRV_PCM_TRIGGER_START: 420 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) 421 ret = siu_pcm_stmwrite_start(port_info); 422 else 423 ret = siu_pcm_stmread_start(port_info); 424 425 if (ret < 0) 426 dev_warn(dev, "%s: start failed on port=%d\n", 427 __func__, info->port_id); 428 429 break; 430 case SNDRV_PCM_TRIGGER_STOP: 431 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) 432 siu_pcm_stmwrite_stop(port_info); 433 else 434 siu_pcm_stmread_stop(port_info); 435 ret = 0; 436 437 break; 438 default: 439 dev_err(dev, "%s() unsupported cmd=%d\n", __func__, cmd); 440 ret = -EINVAL; 441 } 442 443 return ret; 444 } 445 446 /* 447 * So far only resolution of one period is supported, subject to extending the 448 * dmangine API 449 */ 450 static snd_pcm_uframes_t 451 siu_pcm_pointer_dma(struct snd_soc_component *component, 452 struct snd_pcm_substream *ss) 453 { 454 struct device *dev = ss->pcm->card->dev; 455 struct siu_info *info = siu_i2s_data; 456 u32 __iomem *base = info->reg; 457 struct siu_port *port_info = siu_port_info(ss); 458 struct snd_pcm_runtime *rt = ss->runtime; 459 size_t ptr; 460 struct siu_stream *siu_stream; 461 462 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) 463 siu_stream = &port_info->playback; 464 else 465 siu_stream = &port_info->capture; 466 467 /* 468 * ptr is the offset into the buffer where the dma is currently at. We 469 * check if the dma buffer has just wrapped. 470 */ 471 ptr = PERIOD_OFFSET(rt->dma_addr, 472 siu_stream->cur_period, 473 siu_stream->period_bytes) - rt->dma_addr; 474 475 dev_dbg(dev, 476 "%s: port=%d, events %x, FSTS %x, xferred %u/%u, cookie %d\n", 477 __func__, info->port_id, siu_read32(base + SIU_EVNTC), 478 siu_read32(base + SIU_SBFSTS), ptr, siu_stream->buf_bytes, 479 siu_stream->cookie); 480 481 if (ptr >= siu_stream->buf_bytes) 482 ptr = 0; 483 484 return bytes_to_frames(ss->runtime, ptr); 485 } 486 487 static int siu_pcm_new(struct snd_soc_component *component, 488 struct snd_soc_pcm_runtime *rtd) 489 { 490 /* card->dev == socdev->dev, see snd_soc_new_pcms() */ 491 struct snd_card *card = rtd->card->snd_card; 492 struct snd_pcm *pcm = rtd->pcm; 493 struct siu_info *info = siu_i2s_data; 494 struct platform_device *pdev = to_platform_device(card->dev); 495 int ret; 496 int i; 497 498 /* pdev->id selects between SIUA and SIUB */ 499 if (pdev->id < 0 || pdev->id >= SIU_PORT_NUM) 500 return -EINVAL; 501 502 info->port_id = pdev->id; 503 504 /* 505 * While the siu has 2 ports, only one port can be on at a time (only 1 506 * SPB). So far all the boards using the siu had only one of the ports 507 * wired to a codec. To simplify things, we only register one port with 508 * alsa. In case both ports are needed, it should be changed here 509 */ 510 for (i = pdev->id; i < pdev->id + 1; i++) { 511 struct siu_port **port_info = &siu_ports[i]; 512 513 ret = siu_init_port(i, port_info, card); 514 if (ret < 0) 515 return ret; 516 517 snd_pcm_set_managed_buffer_all(pcm, 518 SNDRV_DMA_TYPE_DEV, card->dev, 519 SIU_BUFFER_BYTES_MAX, SIU_BUFFER_BYTES_MAX); 520 521 (*port_info)->pcm = pcm; 522 523 /* IO works */ 524 INIT_WORK(&(*port_info)->playback.work, siu_io_work); 525 INIT_WORK(&(*port_info)->capture.work, siu_io_work); 526 } 527 528 dev_info(card->dev, "SuperH SIU driver initialized.\n"); 529 return 0; 530 } 531 532 static void siu_pcm_free(struct snd_soc_component *component, 533 struct snd_pcm *pcm) 534 { 535 struct platform_device *pdev = to_platform_device(pcm->card->dev); 536 struct siu_port *port_info = siu_ports[pdev->id]; 537 538 cancel_work_sync(&port_info->capture.work); 539 cancel_work_sync(&port_info->playback.work); 540 541 siu_free_port(port_info); 542 543 dev_dbg(pcm->card->dev, "%s\n", __func__); 544 } 545 546 const struct snd_soc_component_driver siu_component = { 547 .name = DRV_NAME, 548 .open = siu_pcm_open, 549 .close = siu_pcm_close, 550 .prepare = siu_pcm_prepare, 551 .trigger = siu_pcm_trigger, 552 .pointer = siu_pcm_pointer_dma, 553 .pcm_construct = siu_pcm_new, 554 .pcm_destruct = siu_pcm_free, 555 }; 556 EXPORT_SYMBOL_GPL(siu_component); 557