Vladimir Barinov | 310355c | 2008-02-18 11:40:22 +0100 | [diff] [blame] | 1 | /* |
| 2 | * ALSA PCM interface for the TI DAVINCI processor |
| 3 | * |
Vladimir Barinov | d6b5203 | 2008-09-29 23:14:11 +0400 | [diff] [blame] | 4 | * Author: Vladimir Barinov, <vbarinov@embeddedalley.com> |
Vladimir Barinov | 310355c | 2008-02-18 11:40:22 +0100 | [diff] [blame] | 5 | * Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.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 version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/dma-mapping.h> |
Alexander Beregalov | 9cd28ab | 2008-12-13 16:25:27 +0300 | [diff] [blame] | 17 | #include <linux/kernel.h> |
Vladimir Barinov | 310355c | 2008-02-18 11:40:22 +0100 | [diff] [blame] | 18 | |
| 19 | #include <sound/core.h> |
| 20 | #include <sound/pcm.h> |
| 21 | #include <sound/pcm_params.h> |
| 22 | #include <sound/soc.h> |
| 23 | |
| 24 | #include <asm/dma.h> |
| 25 | |
| 26 | #include "davinci-pcm.h" |
| 27 | |
Vladimir Barinov | 310355c | 2008-02-18 11:40:22 +0100 | [diff] [blame] | 28 | static struct snd_pcm_hardware davinci_pcm_hardware = { |
| 29 | .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
| 30 | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | |
| 31 | SNDRV_PCM_INFO_PAUSE), |
| 32 | .formats = (SNDRV_PCM_FMTBIT_S16_LE), |
| 33 | .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | |
| 34 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | |
| 35 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | |
| 36 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | |
| 37 | SNDRV_PCM_RATE_KNOT), |
| 38 | .rate_min = 8000, |
| 39 | .rate_max = 96000, |
| 40 | .channels_min = 2, |
| 41 | .channels_max = 2, |
| 42 | .buffer_bytes_max = 128 * 1024, |
| 43 | .period_bytes_min = 32, |
| 44 | .period_bytes_max = 8 * 1024, |
| 45 | .periods_min = 16, |
| 46 | .periods_max = 255, |
| 47 | .fifo_size = 0, |
| 48 | }; |
| 49 | |
| 50 | struct davinci_runtime_data { |
| 51 | spinlock_t lock; |
| 52 | int period; /* current DMA period */ |
| 53 | int master_lch; /* Master DMA channel */ |
| 54 | int slave_lch; /* Slave DMA channel */ |
| 55 | struct davinci_pcm_dma_params *params; /* DMA params */ |
| 56 | }; |
| 57 | |
| 58 | static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream) |
| 59 | { |
| 60 | struct davinci_runtime_data *prtd = substream->runtime->private_data; |
| 61 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 62 | int lch = prtd->slave_lch; |
| 63 | unsigned int period_size; |
| 64 | unsigned int dma_offset; |
| 65 | dma_addr_t dma_pos; |
| 66 | dma_addr_t src, dst; |
| 67 | unsigned short src_bidx, dst_bidx; |
| 68 | unsigned int data_type; |
| 69 | unsigned int count; |
| 70 | |
| 71 | period_size = snd_pcm_lib_period_bytes(substream); |
| 72 | dma_offset = prtd->period * period_size; |
| 73 | dma_pos = runtime->dma_addr + dma_offset; |
| 74 | |
Alexander Beregalov | 9cd28ab | 2008-12-13 16:25:27 +0300 | [diff] [blame] | 75 | pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d " |
| 76 | "dma_ptr = %x period_size=%x\n", lch, dma_pos, period_size); |
Vladimir Barinov | 310355c | 2008-02-18 11:40:22 +0100 | [diff] [blame] | 77 | |
| 78 | data_type = prtd->params->data_type; |
| 79 | count = period_size / data_type; |
| 80 | |
| 81 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| 82 | src = dma_pos; |
| 83 | dst = prtd->params->dma_addr; |
| 84 | src_bidx = data_type; |
| 85 | dst_bidx = 0; |
| 86 | } else { |
| 87 | src = prtd->params->dma_addr; |
| 88 | dst = dma_pos; |
| 89 | src_bidx = 0; |
| 90 | dst_bidx = data_type; |
| 91 | } |
| 92 | |
| 93 | davinci_set_dma_src_params(lch, src, INCR, W8BIT); |
| 94 | davinci_set_dma_dest_params(lch, dst, INCR, W8BIT); |
| 95 | davinci_set_dma_src_index(lch, src_bidx, 0); |
| 96 | davinci_set_dma_dest_index(lch, dst_bidx, 0); |
| 97 | davinci_set_dma_transfer_params(lch, data_type, count, 1, 0, ASYNC); |
| 98 | |
| 99 | prtd->period++; |
| 100 | if (unlikely(prtd->period >= runtime->periods)) |
| 101 | prtd->period = 0; |
| 102 | } |
| 103 | |
| 104 | static void davinci_pcm_dma_irq(int lch, u16 ch_status, void *data) |
| 105 | { |
| 106 | struct snd_pcm_substream *substream = data; |
| 107 | struct davinci_runtime_data *prtd = substream->runtime->private_data; |
| 108 | |
Alexander Beregalov | 9cd28ab | 2008-12-13 16:25:27 +0300 | [diff] [blame] | 109 | pr_debug("davinci_pcm: lch=%d, status=0x%x\n", lch, ch_status); |
Vladimir Barinov | 310355c | 2008-02-18 11:40:22 +0100 | [diff] [blame] | 110 | |
| 111 | if (unlikely(ch_status != DMA_COMPLETE)) |
| 112 | return; |
| 113 | |
| 114 | if (snd_pcm_running(substream)) { |
| 115 | snd_pcm_period_elapsed(substream); |
| 116 | |
| 117 | spin_lock(&prtd->lock); |
| 118 | davinci_pcm_enqueue_dma(substream); |
| 119 | spin_unlock(&prtd->lock); |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | static int davinci_pcm_dma_request(struct snd_pcm_substream *substream) |
| 124 | { |
| 125 | struct davinci_runtime_data *prtd = substream->runtime->private_data; |
| 126 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 127 | struct davinci_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data; |
| 128 | int tcc = TCC_ANY; |
| 129 | int ret; |
| 130 | |
| 131 | if (!dma_data) |
| 132 | return -ENODEV; |
| 133 | |
| 134 | prtd->params = dma_data; |
| 135 | |
| 136 | /* Request master DMA channel */ |
| 137 | ret = davinci_request_dma(prtd->params->channel, prtd->params->name, |
| 138 | davinci_pcm_dma_irq, substream, |
| 139 | &prtd->master_lch, &tcc, EVENTQ_0); |
| 140 | if (ret) |
| 141 | return ret; |
| 142 | |
| 143 | /* Request slave DMA channel */ |
| 144 | ret = davinci_request_dma(PARAM_ANY, "Link", |
| 145 | NULL, NULL, &prtd->slave_lch, &tcc, EVENTQ_0); |
| 146 | if (ret) { |
| 147 | davinci_free_dma(prtd->master_lch); |
| 148 | return ret; |
| 149 | } |
| 150 | |
| 151 | /* Link slave DMA channel in loopback */ |
| 152 | davinci_dma_link_lch(prtd->slave_lch, prtd->slave_lch); |
| 153 | |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| 158 | { |
| 159 | struct davinci_runtime_data *prtd = substream->runtime->private_data; |
| 160 | int ret = 0; |
| 161 | |
| 162 | spin_lock(&prtd->lock); |
| 163 | |
| 164 | switch (cmd) { |
| 165 | case SNDRV_PCM_TRIGGER_START: |
| 166 | case SNDRV_PCM_TRIGGER_RESUME: |
| 167 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 168 | davinci_start_dma(prtd->master_lch); |
| 169 | break; |
| 170 | case SNDRV_PCM_TRIGGER_STOP: |
| 171 | case SNDRV_PCM_TRIGGER_SUSPEND: |
| 172 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 173 | davinci_stop_dma(prtd->master_lch); |
| 174 | break; |
| 175 | default: |
| 176 | ret = -EINVAL; |
| 177 | break; |
| 178 | } |
| 179 | |
| 180 | spin_unlock(&prtd->lock); |
| 181 | |
| 182 | return ret; |
| 183 | } |
| 184 | |
| 185 | static int davinci_pcm_prepare(struct snd_pcm_substream *substream) |
| 186 | { |
| 187 | struct davinci_runtime_data *prtd = substream->runtime->private_data; |
| 188 | struct paramentry_descriptor temp; |
| 189 | |
| 190 | prtd->period = 0; |
| 191 | davinci_pcm_enqueue_dma(substream); |
| 192 | |
| 193 | /* Get slave channel dma params for master channel startup */ |
| 194 | davinci_get_dma_params(prtd->slave_lch, &temp); |
| 195 | davinci_set_dma_params(prtd->master_lch, &temp); |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | static snd_pcm_uframes_t |
| 201 | davinci_pcm_pointer(struct snd_pcm_substream *substream) |
| 202 | { |
| 203 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 204 | struct davinci_runtime_data *prtd = runtime->private_data; |
| 205 | unsigned int offset; |
| 206 | dma_addr_t count; |
| 207 | dma_addr_t src, dst; |
| 208 | |
| 209 | spin_lock(&prtd->lock); |
| 210 | |
| 211 | davinci_dma_getposition(prtd->master_lch, &src, &dst); |
| 212 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| 213 | count = src - runtime->dma_addr; |
| 214 | else |
Fernando Carrijo | c19a28e | 2009-01-07 18:09:08 -0800 | [diff] [blame] | 215 | count = dst - runtime->dma_addr; |
Vladimir Barinov | 310355c | 2008-02-18 11:40:22 +0100 | [diff] [blame] | 216 | |
| 217 | spin_unlock(&prtd->lock); |
| 218 | |
| 219 | offset = bytes_to_frames(runtime, count); |
| 220 | if (offset >= runtime->buffer_size) |
| 221 | offset = 0; |
| 222 | |
| 223 | return offset; |
| 224 | } |
| 225 | |
| 226 | static int davinci_pcm_open(struct snd_pcm_substream *substream) |
| 227 | { |
| 228 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 229 | struct davinci_runtime_data *prtd; |
| 230 | int ret = 0; |
| 231 | |
| 232 | snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware); |
| 233 | |
| 234 | prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL); |
| 235 | if (prtd == NULL) |
| 236 | return -ENOMEM; |
| 237 | |
| 238 | spin_lock_init(&prtd->lock); |
| 239 | |
| 240 | runtime->private_data = prtd; |
| 241 | |
| 242 | ret = davinci_pcm_dma_request(substream); |
| 243 | if (ret) { |
| 244 | printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n"); |
| 245 | kfree(prtd); |
| 246 | } |
| 247 | |
| 248 | return ret; |
| 249 | } |
| 250 | |
| 251 | static int davinci_pcm_close(struct snd_pcm_substream *substream) |
| 252 | { |
| 253 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 254 | struct davinci_runtime_data *prtd = runtime->private_data; |
| 255 | |
| 256 | davinci_dma_unlink_lch(prtd->slave_lch, prtd->slave_lch); |
| 257 | |
| 258 | davinci_free_dma(prtd->slave_lch); |
| 259 | davinci_free_dma(prtd->master_lch); |
| 260 | |
| 261 | kfree(prtd); |
| 262 | |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | static int davinci_pcm_hw_params(struct snd_pcm_substream *substream, |
| 267 | struct snd_pcm_hw_params *hw_params) |
| 268 | { |
| 269 | return snd_pcm_lib_malloc_pages(substream, |
| 270 | params_buffer_bytes(hw_params)); |
| 271 | } |
| 272 | |
| 273 | static int davinci_pcm_hw_free(struct snd_pcm_substream *substream) |
| 274 | { |
| 275 | return snd_pcm_lib_free_pages(substream); |
| 276 | } |
| 277 | |
| 278 | static int davinci_pcm_mmap(struct snd_pcm_substream *substream, |
| 279 | struct vm_area_struct *vma) |
| 280 | { |
| 281 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 282 | |
| 283 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, |
| 284 | runtime->dma_area, |
| 285 | runtime->dma_addr, |
| 286 | runtime->dma_bytes); |
| 287 | } |
| 288 | |
| 289 | struct snd_pcm_ops davinci_pcm_ops = { |
| 290 | .open = davinci_pcm_open, |
| 291 | .close = davinci_pcm_close, |
| 292 | .ioctl = snd_pcm_lib_ioctl, |
| 293 | .hw_params = davinci_pcm_hw_params, |
| 294 | .hw_free = davinci_pcm_hw_free, |
| 295 | .prepare = davinci_pcm_prepare, |
| 296 | .trigger = davinci_pcm_trigger, |
| 297 | .pointer = davinci_pcm_pointer, |
| 298 | .mmap = davinci_pcm_mmap, |
| 299 | }; |
| 300 | |
| 301 | static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) |
| 302 | { |
| 303 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; |
| 304 | struct snd_dma_buffer *buf = &substream->dma_buffer; |
| 305 | size_t size = davinci_pcm_hardware.buffer_bytes_max; |
| 306 | |
| 307 | buf->dev.type = SNDRV_DMA_TYPE_DEV; |
| 308 | buf->dev.dev = pcm->card->dev; |
| 309 | buf->private_data = NULL; |
| 310 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, |
| 311 | &buf->addr, GFP_KERNEL); |
| 312 | |
Alexander Beregalov | 9cd28ab | 2008-12-13 16:25:27 +0300 | [diff] [blame] | 313 | pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, " |
| 314 | "size=%d\n", (void *) buf->area, (void *) buf->addr, size); |
Vladimir Barinov | 310355c | 2008-02-18 11:40:22 +0100 | [diff] [blame] | 315 | |
| 316 | if (!buf->area) |
| 317 | return -ENOMEM; |
| 318 | |
| 319 | buf->bytes = size; |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | static void davinci_pcm_free(struct snd_pcm *pcm) |
| 324 | { |
| 325 | struct snd_pcm_substream *substream; |
| 326 | struct snd_dma_buffer *buf; |
| 327 | int stream; |
| 328 | |
| 329 | for (stream = 0; stream < 2; stream++) { |
| 330 | substream = pcm->streams[stream].substream; |
| 331 | if (!substream) |
| 332 | continue; |
| 333 | |
| 334 | buf = &substream->dma_buffer; |
| 335 | if (!buf->area) |
| 336 | continue; |
| 337 | |
| 338 | dma_free_writecombine(pcm->card->dev, buf->bytes, |
| 339 | buf->area, buf->addr); |
| 340 | buf->area = NULL; |
| 341 | } |
| 342 | } |
| 343 | |
| 344 | static u64 davinci_pcm_dmamask = 0xffffffff; |
| 345 | |
| 346 | static int davinci_pcm_new(struct snd_card *card, |
Liam Girdwood | 9cb132d | 2008-07-07 16:07:42 +0100 | [diff] [blame] | 347 | struct snd_soc_dai *dai, struct snd_pcm *pcm) |
Vladimir Barinov | 310355c | 2008-02-18 11:40:22 +0100 | [diff] [blame] | 348 | { |
| 349 | int ret; |
| 350 | |
| 351 | if (!card->dev->dma_mask) |
| 352 | card->dev->dma_mask = &davinci_pcm_dmamask; |
| 353 | if (!card->dev->coherent_dma_mask) |
| 354 | card->dev->coherent_dma_mask = 0xffffffff; |
| 355 | |
| 356 | if (dai->playback.channels_min) { |
| 357 | ret = davinci_pcm_preallocate_dma_buffer(pcm, |
| 358 | SNDRV_PCM_STREAM_PLAYBACK); |
| 359 | if (ret) |
| 360 | return ret; |
| 361 | } |
| 362 | |
| 363 | if (dai->capture.channels_min) { |
| 364 | ret = davinci_pcm_preallocate_dma_buffer(pcm, |
| 365 | SNDRV_PCM_STREAM_CAPTURE); |
| 366 | if (ret) |
| 367 | return ret; |
| 368 | } |
| 369 | |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | struct snd_soc_platform davinci_soc_platform = { |
| 374 | .name = "davinci-audio", |
| 375 | .pcm_ops = &davinci_pcm_ops, |
| 376 | .pcm_new = davinci_pcm_new, |
| 377 | .pcm_free = davinci_pcm_free, |
| 378 | }; |
| 379 | EXPORT_SYMBOL_GPL(davinci_soc_platform); |
| 380 | |
Takashi Iwai | c9b3a40 | 2008-12-10 07:47:22 +0100 | [diff] [blame] | 381 | static int __init davinci_soc_platform_init(void) |
Mark Brown | 958e792 | 2008-12-03 19:58:17 +0000 | [diff] [blame] | 382 | { |
| 383 | return snd_soc_register_platform(&davinci_soc_platform); |
| 384 | } |
| 385 | module_init(davinci_soc_platform_init); |
| 386 | |
| 387 | static void __exit davinci_soc_platform_exit(void) |
| 388 | { |
| 389 | snd_soc_unregister_platform(&davinci_soc_platform); |
| 390 | } |
| 391 | module_exit(davinci_soc_platform_exit); |
| 392 | |
Vladimir Barinov | 310355c | 2008-02-18 11:40:22 +0100 | [diff] [blame] | 393 | MODULE_AUTHOR("Vladimir Barinov"); |
| 394 | MODULE_DESCRIPTION("TI DAVINCI PCM DMA module"); |
| 395 | MODULE_LICENSE("GPL"); |