| 1 | /* |
| 2 | * dma.c -- ALSA Soc Audio Layer |
| 3 | * |
| 4 | * (c) 2006 Wolfson Microelectronics PLC. |
| 5 | * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com |
| 6 | * |
| 7 | * Copyright 2004-2005 Simtec Electronics |
| 8 | * http://armlinux.simtec.co.uk/ |
| 9 | * Ben Dooks <ben@simtec.co.uk> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify it |
| 12 | * under the terms of the GNU General Public License as published by the |
| 13 | * Free Software Foundation; either version 2 of the License, or (at your |
| 14 | * option) any later version. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/dma-mapping.h> |
| 19 | #include <linux/module.h> |
| 20 | |
| 21 | #include <sound/soc.h> |
| 22 | #include <sound/pcm_params.h> |
| 23 | |
| 24 | #include <asm/dma.h> |
| 25 | #include <mach/hardware.h> |
| 26 | #include <mach/dma.h> |
| 27 | |
| 28 | #include "dma.h" |
| 29 | |
| 30 | #define ST_RUNNING (1<<0) |
| 31 | #define ST_OPENED (1<<1) |
| 32 | |
| 33 | static const struct snd_pcm_hardware dma_hardware = { |
| 34 | .info = SNDRV_PCM_INFO_INTERLEAVED | |
| 35 | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
| 36 | SNDRV_PCM_INFO_MMAP | |
| 37 | SNDRV_PCM_INFO_MMAP_VALID | |
| 38 | SNDRV_PCM_INFO_PAUSE | |
| 39 | SNDRV_PCM_INFO_RESUME, |
| 40 | .formats = SNDRV_PCM_FMTBIT_S16_LE | |
| 41 | SNDRV_PCM_FMTBIT_U16_LE | |
| 42 | SNDRV_PCM_FMTBIT_U8 | |
| 43 | SNDRV_PCM_FMTBIT_S8, |
| 44 | .channels_min = 2, |
| 45 | .channels_max = 2, |
| 46 | .buffer_bytes_max = 128*1024, |
| 47 | .period_bytes_min = PAGE_SIZE, |
| 48 | .period_bytes_max = PAGE_SIZE*2, |
| 49 | .periods_min = 2, |
| 50 | .periods_max = 128, |
| 51 | .fifo_size = 32, |
| 52 | }; |
| 53 | |
| 54 | struct runtime_data { |
| 55 | spinlock_t lock; |
| 56 | int state; |
| 57 | unsigned int dma_loaded; |
| 58 | unsigned int dma_period; |
| 59 | dma_addr_t dma_start; |
| 60 | dma_addr_t dma_pos; |
| 61 | dma_addr_t dma_end; |
| 62 | struct s3c_dma_params *params; |
| 63 | }; |
| 64 | |
| 65 | static void audio_buffdone(void *data); |
| 66 | |
| 67 | /* dma_enqueue |
| 68 | * |
| 69 | * place a dma buffer onto the queue for the dma system |
| 70 | * to handle. |
| 71 | */ |
| 72 | static void dma_enqueue(struct snd_pcm_substream *substream) |
| 73 | { |
| 74 | struct runtime_data *prtd = substream->runtime->private_data; |
| 75 | dma_addr_t pos = prtd->dma_pos; |
| 76 | unsigned int limit; |
| 77 | struct samsung_dma_prep_info dma_info; |
| 78 | |
| 79 | pr_debug("Entered %s\n", __func__); |
| 80 | |
| 81 | limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period; |
| 82 | |
| 83 | pr_debug("%s: loaded %d, limit %d\n", |
| 84 | __func__, prtd->dma_loaded, limit); |
| 85 | |
| 86 | dma_info.cap = (samsung_dma_has_circular() ? DMA_CYCLIC : DMA_SLAVE); |
| 87 | dma_info.direction = |
| 88 | (substream->stream == SNDRV_PCM_STREAM_PLAYBACK |
| 89 | ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM); |
| 90 | dma_info.fp = audio_buffdone; |
| 91 | dma_info.fp_param = substream; |
| 92 | dma_info.period = prtd->dma_period; |
| 93 | dma_info.len = prtd->dma_period*limit; |
| 94 | |
| 95 | while (prtd->dma_loaded < limit) { |
| 96 | pr_debug("dma_loaded: %d\n", prtd->dma_loaded); |
| 97 | |
| 98 | if ((pos + dma_info.period) > prtd->dma_end) { |
| 99 | dma_info.period = prtd->dma_end - pos; |
| 100 | pr_debug("%s: corrected dma len %ld\n", |
| 101 | __func__, dma_info.period); |
| 102 | } |
| 103 | |
| 104 | dma_info.buf = pos; |
| 105 | prtd->params->ops->prepare(prtd->params->ch, &dma_info); |
| 106 | |
| 107 | prtd->dma_loaded++; |
| 108 | pos += prtd->dma_period; |
| 109 | if (pos >= prtd->dma_end) |
| 110 | pos = prtd->dma_start; |
| 111 | } |
| 112 | |
| 113 | prtd->dma_pos = pos; |
| 114 | } |
| 115 | |
| 116 | static void audio_buffdone(void *data) |
| 117 | { |
| 118 | struct snd_pcm_substream *substream = data; |
| 119 | struct runtime_data *prtd = substream->runtime->private_data; |
| 120 | |
| 121 | pr_debug("Entered %s\n", __func__); |
| 122 | |
| 123 | if (prtd->state & ST_RUNNING) { |
| 124 | prtd->dma_pos += prtd->dma_period; |
| 125 | if (prtd->dma_pos >= prtd->dma_end) |
| 126 | prtd->dma_pos = prtd->dma_start; |
| 127 | |
| 128 | if (substream) |
| 129 | snd_pcm_period_elapsed(substream); |
| 130 | |
| 131 | spin_lock(&prtd->lock); |
| 132 | if (!samsung_dma_has_circular()) { |
| 133 | prtd->dma_loaded--; |
| 134 | dma_enqueue(substream); |
| 135 | } |
| 136 | spin_unlock(&prtd->lock); |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | static int dma_hw_params(struct snd_pcm_substream *substream, |
| 141 | struct snd_pcm_hw_params *params) |
| 142 | { |
| 143 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 144 | struct runtime_data *prtd = runtime->private_data; |
| 145 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 146 | unsigned long totbytes = params_buffer_bytes(params); |
| 147 | struct s3c_dma_params *dma = |
| 148 | snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); |
| 149 | struct samsung_dma_info dma_info; |
| 150 | |
| 151 | pr_debug("Entered %s\n", __func__); |
| 152 | |
| 153 | /* return if this is a bufferless transfer e.g. |
| 154 | * codec <--> BT codec or GSM modem -- lg FIXME */ |
| 155 | if (!dma) |
| 156 | return 0; |
| 157 | |
| 158 | /* this may get called several times by oss emulation |
| 159 | * with different params -HW */ |
| 160 | if (prtd->params == NULL) { |
| 161 | /* prepare DMA */ |
| 162 | prtd->params = dma; |
| 163 | |
| 164 | pr_debug("params %p, client %p, channel %d\n", prtd->params, |
| 165 | prtd->params->client, prtd->params->channel); |
| 166 | |
| 167 | prtd->params->ops = samsung_dma_get_ops(); |
| 168 | |
| 169 | dma_info.cap = (samsung_dma_has_circular() ? |
| 170 | DMA_CYCLIC : DMA_SLAVE); |
| 171 | dma_info.client = prtd->params->client; |
| 172 | dma_info.direction = |
| 173 | (substream->stream == SNDRV_PCM_STREAM_PLAYBACK |
| 174 | ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM); |
| 175 | dma_info.width = prtd->params->dma_size; |
| 176 | dma_info.fifo = prtd->params->dma_addr; |
| 177 | prtd->params->ch = prtd->params->ops->request( |
| 178 | prtd->params->channel, &dma_info); |
| 179 | } |
| 180 | |
| 181 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| 182 | |
| 183 | runtime->dma_bytes = totbytes; |
| 184 | |
| 185 | spin_lock_irq(&prtd->lock); |
| 186 | prtd->dma_loaded = 0; |
| 187 | prtd->dma_period = params_period_bytes(params); |
| 188 | prtd->dma_start = runtime->dma_addr; |
| 189 | prtd->dma_pos = prtd->dma_start; |
| 190 | prtd->dma_end = prtd->dma_start + totbytes; |
| 191 | spin_unlock_irq(&prtd->lock); |
| 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static int dma_hw_free(struct snd_pcm_substream *substream) |
| 197 | { |
| 198 | struct runtime_data *prtd = substream->runtime->private_data; |
| 199 | |
| 200 | pr_debug("Entered %s\n", __func__); |
| 201 | |
| 202 | snd_pcm_set_runtime_buffer(substream, NULL); |
| 203 | |
| 204 | if (prtd->params) { |
| 205 | prtd->params->ops->flush(prtd->params->ch); |
| 206 | prtd->params->ops->release(prtd->params->ch, |
| 207 | prtd->params->client); |
| 208 | prtd->params = NULL; |
| 209 | } |
| 210 | |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | static int dma_prepare(struct snd_pcm_substream *substream) |
| 215 | { |
| 216 | struct runtime_data *prtd = substream->runtime->private_data; |
| 217 | int ret = 0; |
| 218 | |
| 219 | pr_debug("Entered %s\n", __func__); |
| 220 | |
| 221 | /* return if this is a bufferless transfer e.g. |
| 222 | * codec <--> BT codec or GSM modem -- lg FIXME */ |
| 223 | if (!prtd->params) |
| 224 | return 0; |
| 225 | |
| 226 | /* flush the DMA channel */ |
| 227 | prtd->params->ops->flush(prtd->params->ch); |
| 228 | |
| 229 | prtd->dma_loaded = 0; |
| 230 | prtd->dma_pos = prtd->dma_start; |
| 231 | |
| 232 | /* enqueue dma buffers */ |
| 233 | dma_enqueue(substream); |
| 234 | |
| 235 | return ret; |
| 236 | } |
| 237 | |
| 238 | static int dma_trigger(struct snd_pcm_substream *substream, int cmd) |
| 239 | { |
| 240 | struct runtime_data *prtd = substream->runtime->private_data; |
| 241 | int ret = 0; |
| 242 | |
| 243 | pr_debug("Entered %s\n", __func__); |
| 244 | |
| 245 | spin_lock(&prtd->lock); |
| 246 | |
| 247 | switch (cmd) { |
| 248 | case SNDRV_PCM_TRIGGER_START: |
| 249 | case SNDRV_PCM_TRIGGER_RESUME: |
| 250 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 251 | prtd->state |= ST_RUNNING; |
| 252 | prtd->params->ops->trigger(prtd->params->ch); |
| 253 | break; |
| 254 | |
| 255 | case SNDRV_PCM_TRIGGER_STOP: |
| 256 | case SNDRV_PCM_TRIGGER_SUSPEND: |
| 257 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 258 | prtd->state &= ~ST_RUNNING; |
| 259 | prtd->params->ops->stop(prtd->params->ch); |
| 260 | break; |
| 261 | |
| 262 | default: |
| 263 | ret = -EINVAL; |
| 264 | break; |
| 265 | } |
| 266 | |
| 267 | spin_unlock(&prtd->lock); |
| 268 | |
| 269 | return ret; |
| 270 | } |
| 271 | |
| 272 | static snd_pcm_uframes_t |
| 273 | dma_pointer(struct snd_pcm_substream *substream) |
| 274 | { |
| 275 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 276 | struct runtime_data *prtd = runtime->private_data; |
| 277 | unsigned long res; |
| 278 | |
| 279 | pr_debug("Entered %s\n", __func__); |
| 280 | |
| 281 | res = prtd->dma_pos - prtd->dma_start; |
| 282 | |
| 283 | pr_debug("Pointer offset: %lu\n", res); |
| 284 | |
| 285 | /* we seem to be getting the odd error from the pcm library due |
| 286 | * to out-of-bounds pointers. this is maybe due to the dma engine |
| 287 | * not having loaded the new values for the channel before being |
| 288 | * called... (todo - fix ) |
| 289 | */ |
| 290 | |
| 291 | if (res >= snd_pcm_lib_buffer_bytes(substream)) { |
| 292 | if (res == snd_pcm_lib_buffer_bytes(substream)) |
| 293 | res = 0; |
| 294 | } |
| 295 | |
| 296 | return bytes_to_frames(substream->runtime, res); |
| 297 | } |
| 298 | |
| 299 | static int dma_open(struct snd_pcm_substream *substream) |
| 300 | { |
| 301 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 302 | struct runtime_data *prtd; |
| 303 | |
| 304 | pr_debug("Entered %s\n", __func__); |
| 305 | |
| 306 | snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); |
| 307 | snd_soc_set_runtime_hwparams(substream, &dma_hardware); |
| 308 | |
| 309 | prtd = kzalloc(sizeof(struct runtime_data), GFP_KERNEL); |
| 310 | if (prtd == NULL) |
| 311 | return -ENOMEM; |
| 312 | |
| 313 | spin_lock_init(&prtd->lock); |
| 314 | |
| 315 | runtime->private_data = prtd; |
| 316 | return 0; |
| 317 | } |
| 318 | |
| 319 | static int dma_close(struct snd_pcm_substream *substream) |
| 320 | { |
| 321 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 322 | struct runtime_data *prtd = runtime->private_data; |
| 323 | |
| 324 | pr_debug("Entered %s\n", __func__); |
| 325 | |
| 326 | if (!prtd) |
| 327 | pr_debug("dma_close called with prtd == NULL\n"); |
| 328 | |
| 329 | kfree(prtd); |
| 330 | |
| 331 | return 0; |
| 332 | } |
| 333 | |
| 334 | static int dma_mmap(struct snd_pcm_substream *substream, |
| 335 | struct vm_area_struct *vma) |
| 336 | { |
| 337 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 338 | |
| 339 | pr_debug("Entered %s\n", __func__); |
| 340 | |
| 341 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, |
| 342 | runtime->dma_area, |
| 343 | runtime->dma_addr, |
| 344 | runtime->dma_bytes); |
| 345 | } |
| 346 | |
| 347 | static struct snd_pcm_ops dma_ops = { |
| 348 | .open = dma_open, |
| 349 | .close = dma_close, |
| 350 | .ioctl = snd_pcm_lib_ioctl, |
| 351 | .hw_params = dma_hw_params, |
| 352 | .hw_free = dma_hw_free, |
| 353 | .prepare = dma_prepare, |
| 354 | .trigger = dma_trigger, |
| 355 | .pointer = dma_pointer, |
| 356 | .mmap = dma_mmap, |
| 357 | }; |
| 358 | |
| 359 | static int preallocate_dma_buffer(struct snd_pcm *pcm, int stream) |
| 360 | { |
| 361 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; |
| 362 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
| 363 | size_t size = dma_hardware.buffer_bytes_max; |
| 364 | |
| 365 | pr_debug("Entered %s\n", __func__); |
| 366 | |
| 367 | buf->dev.type = SNDRV_DMA_TYPE_DEV; |
| 368 | buf->dev.dev = pcm->card->dev; |
| 369 | buf->private_data = NULL; |
| 370 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, |
| 371 | &buf->addr, GFP_KERNEL); |
| 372 | if (!buf->area) |
| 373 | return -ENOMEM; |
| 374 | buf->bytes = size; |
| 375 | return 0; |
| 376 | } |
| 377 | |
| 378 | static void dma_free_dma_buffers(struct snd_pcm *pcm) |
| 379 | { |
| 380 | struct snd_pcm_substream *substream; |
| 381 | struct snd_dma_buffer *buf; |
| 382 | int stream; |
| 383 | |
| 384 | pr_debug("Entered %s\n", __func__); |
| 385 | |
| 386 | for (stream = 0; stream < 2; stream++) { |
| 387 | substream = pcm->streams[stream].substream; |
| 388 | if (!substream) |
| 389 | continue; |
| 390 | |
| 391 | buf = &substream->dma_buffer; |
| 392 | if (!buf->area) |
| 393 | continue; |
| 394 | |
| 395 | dma_free_writecombine(pcm->card->dev, buf->bytes, |
| 396 | buf->area, buf->addr); |
| 397 | buf->area = NULL; |
| 398 | } |
| 399 | } |
| 400 | |
| 401 | static u64 dma_mask = DMA_BIT_MASK(32); |
| 402 | |
| 403 | static int dma_new(struct snd_soc_pcm_runtime *rtd) |
| 404 | { |
| 405 | struct snd_card *card = rtd->card->snd_card; |
| 406 | struct snd_pcm *pcm = rtd->pcm; |
| 407 | int ret = 0; |
| 408 | |
| 409 | pr_debug("Entered %s\n", __func__); |
| 410 | |
| 411 | if (!card->dev->dma_mask) |
| 412 | card->dev->dma_mask = &dma_mask; |
| 413 | if (!card->dev->coherent_dma_mask) |
| 414 | card->dev->coherent_dma_mask = DMA_BIT_MASK(32); |
| 415 | |
| 416 | if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { |
| 417 | ret = preallocate_dma_buffer(pcm, |
| 418 | SNDRV_PCM_STREAM_PLAYBACK); |
| 419 | if (ret) |
| 420 | goto out; |
| 421 | } |
| 422 | |
| 423 | if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { |
| 424 | ret = preallocate_dma_buffer(pcm, |
| 425 | SNDRV_PCM_STREAM_CAPTURE); |
| 426 | if (ret) |
| 427 | goto out; |
| 428 | } |
| 429 | out: |
| 430 | return ret; |
| 431 | } |
| 432 | |
| 433 | static struct snd_soc_platform_driver samsung_asoc_platform = { |
| 434 | .ops = &dma_ops, |
| 435 | .pcm_new = dma_new, |
| 436 | .pcm_free = dma_free_dma_buffers, |
| 437 | }; |
| 438 | |
| 439 | static int __devinit samsung_asoc_platform_probe(struct platform_device *pdev) |
| 440 | { |
| 441 | return snd_soc_register_platform(&pdev->dev, &samsung_asoc_platform); |
| 442 | } |
| 443 | |
| 444 | static int __devexit samsung_asoc_platform_remove(struct platform_device *pdev) |
| 445 | { |
| 446 | snd_soc_unregister_platform(&pdev->dev); |
| 447 | return 0; |
| 448 | } |
| 449 | |
| 450 | static struct platform_driver asoc_dma_driver = { |
| 451 | .driver = { |
| 452 | .name = "samsung-audio", |
| 453 | .owner = THIS_MODULE, |
| 454 | }, |
| 455 | |
| 456 | .probe = samsung_asoc_platform_probe, |
| 457 | .remove = __devexit_p(samsung_asoc_platform_remove), |
| 458 | }; |
| 459 | |
| 460 | module_platform_driver(asoc_dma_driver); |
| 461 | |
| 462 | MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); |
| 463 | MODULE_DESCRIPTION("Samsung ASoC DMA Driver"); |
| 464 | MODULE_LICENSE("GPL"); |
| 465 | MODULE_ALIAS("platform:samsung-audio"); |