sound/soc/soc-dmaengine-pcm.c

   1 /*
   2  *  Copyright (C) 2012, Analog Devices Inc.
   3  *      Author: Lars-Peter Clausen <lars@metafoo.de>
   4  *
   5  *  Based on:
   6  *      imx-pcm-dma-mx2.c, Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
   7  *      mxs-pcm.c, Copyright (C) 2011 Freescale Semiconductor, Inc.
   8  *      ep93xx-pcm.c, Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
   9  *                    Copyright (C) 2006 Applied Data Systems
  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  *  You should have received a copy of the GNU General Public License along
  17  *  with this program; if not, write to the Free Software Foundation, Inc.,
  18  *  675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  */
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/dmaengine.h>
  24 #include <linux/slab.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27 #include <sound/soc.h>
  28
  29 #include <sound/dmaengine_pcm.h>
  30
  31 struct dmaengine_pcm_runtime_data {
  32         struct dma_chan *dma_chan;
  33         dma_cookie_t cookie;
  34
  35         unsigned int pos;
  36 };
  37
  38 static inline struct dmaengine_pcm_runtime_data *substream_to_prtd(
  39         const struct snd_pcm_substream *substream)
  40 {
  41         return substream->runtime->private_data;
  42 }
  43
  44 struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream)
  45 {
  46         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
  47
  48         return prtd->dma_chan;
  49 }
  50 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_get_chan);
  51
  52 /**
  53  * snd_hwparams_to_dma_slave_config - Convert hw_params to dma_slave_config
  54  * @substream: PCM substream
  55  * @params: hw_params
  56  * @slave_config: DMA slave config
  57  *
  58  * This function can be used to initialize a dma_slave_config from a substream
  59  * and hw_params in a dmaengine based PCM driver implementation.
  60  */
  61 int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
  62         const struct snd_pcm_hw_params *params,
  63         struct dma_slave_config *slave_config)
  64 {
  65         enum dma_slave_buswidth buswidth;
  66
  67         switch (params_format(params)) {
  68         case SNDRV_PCM_FORMAT_S8:
  69                 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
  70                 break;
  71         case SNDRV_PCM_FORMAT_S16_LE:
  72                 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
  73                 break;
  74         case SNDRV_PCM_FORMAT_S18_3LE:
  75         case SNDRV_PCM_FORMAT_S20_3LE:
  76         case SNDRV_PCM_FORMAT_S24_LE:
  77         case SNDRV_PCM_FORMAT_S32_LE:
  78                 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
  79                 break;
  80         default:
  81                 return -EINVAL;
  82         }
  83
  84         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  85                 slave_config->direction = DMA_MEM_TO_DEV;
  86                 slave_config->dst_addr_width = buswidth;
  87         } else {
  88                 slave_config->direction = DMA_DEV_TO_MEM;
  89                 slave_config->src_addr_width = buswidth;
  90         }
  91
  92         slave_config->device_fc = false;
  93
  94         return 0;
  95 }
  96 EXPORT_SYMBOL_GPL(snd_hwparams_to_dma_slave_config);
  97
  98 /**
  99  * snd_dmaengine_pcm_set_config_from_dai_data() - Initializes a dma slave config
 100  *  using DAI DMA data.
 101  * @substream: PCM substream
 102  * @dma_data: DAI DMA data
 103  * @slave_config: DMA slave configuration
 104  *
 105  * Initializes the {dst,src}_addr, {dst,src}_maxburst, {dst,src}_addr_width and
 106  * slave_id fields of the DMA slave config from the same fields of the DAI DMA
 107  * data struct. The src and dst fields will be initialized depending on the
 108  * direction of the substream. If the substream is a playback stream the dst
 109  * fields will be initialized, if it is a capture stream the src fields will be
 110  * initialized. The {dst,src}_addr_width field will only be initialized if the
 111  * addr_width field of the DAI DMA data struct is not equal to
 112  * DMA_SLAVE_BUSWIDTH_UNDEFINED.
 113  */
 114 void snd_dmaengine_pcm_set_config_from_dai_data(
 115         const struct snd_pcm_substream *substream,
 116         const struct snd_dmaengine_dai_dma_data *dma_data,
 117         struct dma_slave_config *slave_config)
 118 {
 119         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 120                 slave_config->dst_addr = dma_data->addr;
 121                 slave_config->dst_maxburst = dma_data->maxburst;
 122                 if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED)
 123                         slave_config->dst_addr_width = dma_data->addr_width;
 124         } else {
 125                 slave_config->src_addr = dma_data->addr;
 126                 slave_config->src_maxburst = dma_data->maxburst;
 127                 if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED)
 128                         slave_config->src_addr_width = dma_data->addr_width;
 129         }
 130
 131         slave_config->slave_id = dma_data->slave_id;
 132 }
 133 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_set_config_from_dai_data);
 134
 135 #ifdef CONFIG_ARCH_ROCKCHIP
 136 static int debug_audio_timeout = 0;
 137 module_param(debug_audio_timeout, int, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
 138 MODULE_PARM_DESC(debug_audio_timeout, "Debug interface Audio DMA buffdone time out");
 139 #endif
 140 static void dmaengine_pcm_dma_complete(void *arg)
 141 {
 142         struct snd_pcm_substream *substream = arg;
 143         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
 144
 145 #ifdef CONFIG_ARCH_ROCKCHIP
 146         if(debug_audio_timeout){
 147                 struct snd_pcm_runtime *runtime = substream->runtime;
 148                 static ktime_t before = {0},after = {0};
 149                 s64 t;
 150                 before = after;
 151                 after = ktime_get();
 152                 t = ktime_to_us(ktime_sub(after, before));
 153
 154                 if(t > (snd_pcm_lib_period_bytes(substream)/4+32)*1000*1000/runtime->rate
 155                         && t != ktime_to_us(after)) // (23220)4096/4/44100 + 32/44100
 156                 {
 157                                 printk(KERN_DEBUG "Time out:: Audio DMA buffdone time out!!! the time = %lld!\n", t);
 158                 }
 159                 //printk(KERN_DEBUG "audio DMA callback time = %lld\n", t);
 160         }
 161 #endif
 162         prtd->pos += snd_pcm_lib_period_bytes(substream);
 163         if (prtd->pos >= snd_pcm_lib_buffer_bytes(substream))
 164                 prtd->pos = 0;
 165
 166         snd_pcm_period_elapsed(substream);
 167 }
 168
 169 static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream)
 170 {
 171         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
 172         struct dma_chan *chan = prtd->dma_chan;
 173         struct dma_async_tx_descriptor *desc;
 174         enum dma_transfer_direction direction;
 175         unsigned long flags = DMA_CTRL_ACK;
 176
 177         direction = snd_pcm_substream_to_dma_direction(substream);
 178
 179         if (!substream->runtime->no_period_wakeup)
 180                 flags |= DMA_PREP_INTERRUPT;
 181
 182         prtd->pos = 0;
 183 #ifdef CONFIG_ARCH_ROCKCHIP
 184         //printk("soc dma buffersize = %d , periodsize=%d, periods=%d\n",
 185         //      snd_pcm_lib_buffer_bytes(substream),
 186         //      snd_pcm_lib_period_bytes(substream),
 187         //      snd_pcm_lib_buffer_bytes(substream)/snd_pcm_lib_period_bytes(substream));
 188         desc = dmaengine_prep_dma_infiniteloop(chan,
 189                 substream->runtime->dma_addr,
 190                 snd_pcm_lib_buffer_bytes(substream),
 191                 snd_pcm_lib_period_bytes(substream),
 192                 direction, flags,
 193                 snd_pcm_lib_buffer_bytes(substream)/snd_pcm_lib_period_bytes(substream));
 194 #else
 195         desc = dmaengine_prep_dma_cyclic(chan,
 196                 substream->runtime->dma_addr,
 197                 snd_pcm_lib_buffer_bytes(substream),
 198                 snd_pcm_lib_period_bytes(substream), direction, flags);
 199 #endif
 200
 201         if (!desc)
 202                 return -ENOMEM;
 203
 204         desc->callback = dmaengine_pcm_dma_complete;
 205         desc->callback_param = substream;
 206         prtd->cookie = dmaengine_submit(desc);
 207
 208         return 0;
 209 }
 210
 211 /**
 212  * snd_dmaengine_pcm_trigger - dmaengine based PCM trigger implementation
 213  * @substream: PCM substream
 214  * @cmd: Trigger command
 215  *
 216  * Returns 0 on success, a negative error code otherwise.
 217  *
 218  * This function can be used as the PCM trigger callback for dmaengine based PCM
 219  * driver implementations.
 220  */
 221 int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 222 {
 223         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
 224         int ret;
 225
 226         switch (cmd) {
 227         case SNDRV_PCM_TRIGGER_START:
 228                 ret = dmaengine_pcm_prepare_and_submit(substream);
 229                 if (ret)
 230                         return ret;
 231                 dma_async_issue_pending(prtd->dma_chan);
 232                 break;
 233         case SNDRV_PCM_TRIGGER_RESUME:
 234         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 235                 dmaengine_resume(prtd->dma_chan);
 236                 break;
 237         case SNDRV_PCM_TRIGGER_SUSPEND:
 238         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 239                 dmaengine_pause(prtd->dma_chan);
 240                 break;
 241         case SNDRV_PCM_TRIGGER_STOP:
 242                 dmaengine_terminate_all(prtd->dma_chan);
 243                 break;
 244         default:
 245                 return -EINVAL;
 246         }
 247
 248         return 0;
 249 }
 250 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_trigger);
 251
 252 /**
 253  * snd_dmaengine_pcm_pointer_no_residue - dmaengine based PCM pointer implementation
 254  * @substream: PCM substream
 255  *
 256  * This function is deprecated and should not be used by new drivers, as its
 257  * results may be unreliable.
 258  */
 259 snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream)
 260 {
 261         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
 262 #ifdef CONFIG_ARCH_ROCKCHIP
 263         dma_addr_t src, dst;
 264
 265         prtd->dma_chan->device->dma_getposition(prtd->dma_chan, &src, &dst);
 266         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 267                 prtd->pos = dst - substream->runtime->dma_addr;
 268         else
 269                 prtd->pos = src - substream->runtime->dma_addr;
 270 #endif
 271         return bytes_to_frames(substream->runtime, prtd->pos);
 272 }
 273 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer_no_residue);
 274
 275 /**
 276  * snd_dmaengine_pcm_pointer - dmaengine based PCM pointer implementation
 277  * @substream: PCM substream
 278  *
 279  * This function can be used as the PCM pointer callback for dmaengine based PCM
 280  * driver implementations.
 281  */
 282 snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream)
 283 {
 284         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
 285         struct dma_tx_state state;
 286         enum dma_status status;
 287         unsigned int buf_size;
 288         unsigned int pos = 0;
 289
 290         status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state);
 291         if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) {
 292                 buf_size = snd_pcm_lib_buffer_bytes(substream);
 293                 if (state.residue > 0 && state.residue <= buf_size)
 294                         pos = buf_size - state.residue;
 295         }
 296
 297         return bytes_to_frames(substream->runtime, pos);
 298 }
 299 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer);
 300
 301 /**
 302  * snd_dmaengine_pcm_request_channel - Request channel for the dmaengine PCM
 303  * @filter_fn: Filter function used to request the DMA channel
 304  * @filter_data: Data passed to the DMA filter function
 305  *
 306  * Returns NULL or the requested DMA channel.
 307  *
 308  * This function request a DMA channel for usage with dmaengine PCM.
 309  */
 310 struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
 311         void *filter_data)
 312 {
 313         dma_cap_mask_t mask;
 314
 315         dma_cap_zero(mask);
 316         dma_cap_set(DMA_SLAVE, mask);
 317         dma_cap_set(DMA_CYCLIC, mask);
 318
 319         return dma_request_channel(mask, filter_fn, filter_data);
 320 }
 321 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_channel);
 322
 323 /**
 324  * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream
 325  * @substream: PCM substream
 326  * @chan: DMA channel to use for data transfers
 327  *
 328  * Returns 0 on success, a negative error code otherwise.
 329  *
 330  * The function should usually be called from the pcm open callback. Note that
 331  * this function will use private_data field of the substream's runtime. So it
 332  * is not availabe to your pcm driver implementation.
 333  */
 334 int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
 335         struct dma_chan *chan)
 336 {
 337         struct dmaengine_pcm_runtime_data *prtd;
 338         int ret;
 339
 340         if (!chan)
 341                 return -ENXIO;
 342
 343         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 344                                             SNDRV_PCM_HW_PARAM_PERIODS);
 345         if (ret < 0)
 346                 return ret;
 347
 348         prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
 349         if (!prtd)
 350                 return -ENOMEM;
 351
 352         prtd->dma_chan = chan;
 353
 354         substream->runtime->private_data = prtd;
 355
 356         return 0;
 357 }
 358 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open);
 359
 360 /**
 361  * snd_dmaengine_pcm_open_request_chan - Open a dmaengine based PCM substream and request channel
 362  * @substream: PCM substream
 363  * @filter_fn: Filter function used to request the DMA channel
 364  * @filter_data: Data passed to the DMA filter function
 365  *
 366  * Returns 0 on success, a negative error code otherwise.
 367  *
 368  * This function will request a DMA channel using the passed filter function and
 369  * data. The function should usually be called from the pcm open callback. Note
 370  * that this function will use private_data field of the substream's runtime. So
 371  * it is not availabe to your pcm driver implementation.
 372  */
 373 int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
 374         dma_filter_fn filter_fn, void *filter_data)
 375 {
 376         return snd_dmaengine_pcm_open(substream,
 377                     snd_dmaengine_pcm_request_channel(filter_fn, filter_data));
 378 }
 379 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan);
 380
 381 /**
 382  * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
 383  * @substream: PCM substream
 384  */
 385 int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream)
 386 {
 387         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
 388
 389         kfree(prtd);
 390
 391         return 0;
 392 }
 393 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close);
 394
 395 /**
 396  * snd_dmaengine_pcm_release_chan_close - Close a dmaengine based PCM substream and release channel
 397  * @substream: PCM substream
 398  *
 399  * Releases the DMA channel associated with the PCM substream.
 400  */
 401 int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream)
 402 {
 403         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
 404
 405         dma_release_channel(prtd->dma_chan);
 406
 407         return snd_dmaengine_pcm_close(substream);
 408 }
 409 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close_release_chan);
 410
 411 MODULE_LICENSE("GPL");