sound/soc/blackfin/bf5xx-i2s-pcm.c

   1 /*
   2  * File:         sound/soc/blackfin/bf5xx-i2s-pcm.c
   3  * Author:       Cliff Cai <Cliff.Cai@analog.com>
   4  *
   5  * Created:      Tue June 06 2008
   6  * Description:  DMA driver for i2s codec
   7  *
   8  * Modified:
   9  *               Copyright 2008 Analog Devices Inc.
  10  *
  11  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, see the file COPYING, or write
  25  * to the Free Software Foundation, Inc.,
  26  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/slab.h>
  33 #include <linux/dma-mapping.h>
  34
  35 #include <sound/core.h>
  36 #include <sound/pcm.h>
  37 #include <sound/pcm_params.h>
  38 #include <sound/soc.h>
  39
  40 #include <asm/dma.h>
  41
  42 #include "bf5xx-i2s-pcm.h"
  43 #include "bf5xx-i2s.h"
  44 #include "bf5xx-sport.h"
  45
  46 static void bf5xx_dma_irq(void *data)
  47 {
  48         struct snd_pcm_substream *pcm = data;
  49         snd_pcm_period_elapsed(pcm);
  50 }
  51
  52 static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
  53         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
  54                                    SNDRV_PCM_INFO_MMAP |
  55                                    SNDRV_PCM_INFO_MMAP_VALID |
  56                                    SNDRV_PCM_INFO_BLOCK_TRANSFER,
  57         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  58                                    SNDRV_PCM_FMTBIT_S24_LE |
  59                                    SNDRV_PCM_FMTBIT_S32_LE,
  60         .period_bytes_min       = 32,
  61         .period_bytes_max       = 0x10000,
  62         .periods_min            = 1,
  63         .periods_max            = PAGE_SIZE/32,
  64         .buffer_bytes_max       = 0x20000, /* 128 kbytes */
  65         .fifo_size              = 16,
  66 };
  67
  68 static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
  69         struct snd_pcm_hw_params *params)
  70 {
  71         size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
  72         snd_pcm_lib_malloc_pages(substream, size);
  73
  74         return 0;
  75 }
  76
  77 static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
  78 {
  79         snd_pcm_lib_free_pages(substream);
  80
  81         return 0;
  82 }
  83
  84 static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
  85 {
  86         struct snd_pcm_runtime *runtime = substream->runtime;
  87         struct sport_device *sport = runtime->private_data;
  88         int period_bytes = frames_to_bytes(runtime, runtime->period_size);
  89
  90         pr_debug("%s enter\n", __func__);
  91         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  92                 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
  93                 sport_config_tx_dma(sport, runtime->dma_area,
  94                         runtime->periods, period_bytes);
  95         } else {
  96                 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
  97                 sport_config_rx_dma(sport, runtime->dma_area,
  98                         runtime->periods, period_bytes);
  99         }
 100
 101         return 0;
 102 }
 103
 104 static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 105 {
 106         struct snd_pcm_runtime *runtime = substream->runtime;
 107         struct sport_device *sport = runtime->private_data;
 108         int ret = 0;
 109
 110         pr_debug("%s enter\n", __func__);
 111         switch (cmd) {
 112         case SNDRV_PCM_TRIGGER_START:
 113                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 114                         sport_tx_start(sport);
 115                 else
 116                         sport_rx_start(sport);
 117                 break;
 118         case SNDRV_PCM_TRIGGER_STOP:
 119         case SNDRV_PCM_TRIGGER_SUSPEND:
 120         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 121                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 122                         sport_tx_stop(sport);
 123                 else
 124                         sport_rx_stop(sport);
 125                 break;
 126         default:
 127                 ret = -EINVAL;
 128         }
 129
 130         return ret;
 131 }
 132
 133 static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
 134 {
 135         struct snd_pcm_runtime *runtime = substream->runtime;
 136         struct sport_device *sport = runtime->private_data;
 137         unsigned int diff;
 138         snd_pcm_uframes_t frames;
 139         pr_debug("%s enter\n", __func__);
 140         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 141                 diff = sport_curr_offset_tx(sport);
 142                 frames = bytes_to_frames(substream->runtime, diff);
 143         } else {
 144                 diff = sport_curr_offset_rx(sport);
 145                 frames = bytes_to_frames(substream->runtime, diff);
 146         }
 147         return frames;
 148 }
 149
 150 static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
 151 {
 152         struct snd_pcm_runtime *runtime = substream->runtime;
 153         int ret;
 154
 155         pr_debug("%s enter\n", __func__);
 156         snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
 157
 158         ret = snd_pcm_hw_constraint_integer(runtime, \
 159                         SNDRV_PCM_HW_PARAM_PERIODS);
 160         if (ret < 0)
 161                 goto out;
 162
 163         if (sport_handle != NULL)
 164                 runtime->private_data = sport_handle;
 165         else {
 166                 pr_err("sport_handle is NULL\n");
 167                 return -1;
 168         }
 169         return 0;
 170
 171  out:
 172         return ret;
 173 }
 174
 175 static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
 176         struct vm_area_struct *vma)
 177 {
 178         struct snd_pcm_runtime *runtime = substream->runtime;
 179         size_t size = vma->vm_end - vma->vm_start;
 180         vma->vm_start = (unsigned long)runtime->dma_area;
 181         vma->vm_end = vma->vm_start + size;
 182         vma->vm_flags |=  VM_SHARED;
 183
 184         return 0 ;
 185 }
 186
 187 static struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
 188         .open           = bf5xx_pcm_open,
 189         .ioctl          = snd_pcm_lib_ioctl,
 190         .hw_params      = bf5xx_pcm_hw_params,
 191         .hw_free        = bf5xx_pcm_hw_free,
 192         .prepare        = bf5xx_pcm_prepare,
 193         .trigger        = bf5xx_pcm_trigger,
 194         .pointer        = bf5xx_pcm_pointer,
 195         .mmap           = bf5xx_pcm_mmap,
 196 };
 197
 198 static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 199 {
 200         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 201         struct snd_dma_buffer *buf = &substream->dma_buffer;
 202         size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
 203
 204         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 205         buf->dev.dev = pcm->card->dev;
 206         buf->private_data = NULL;
 207         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 208                         &buf->addr, GFP_KERNEL);
 209         if (!buf->area) {
 210                 pr_err("Failed to allocate dma memory \
 211                         Please increase uncached DMA memory region\n");
 212                 return -ENOMEM;
 213         }
 214         buf->bytes = size;
 215
 216         pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
 217                 buf->area, buf->bytes);
 218
 219         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 220                 sport_handle->tx_buf = buf->area;
 221         else
 222                 sport_handle->rx_buf = buf->area;
 223
 224         return 0;
 225 }
 226
 227 static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 228 {
 229         struct snd_pcm_substream *substream;
 230         struct snd_dma_buffer *buf;
 231         int stream;
 232
 233         for (stream = 0; stream < 2; stream++) {
 234                 substream = pcm->streams[stream].substream;
 235                 if (!substream)
 236                         continue;
 237
 238                 buf = &substream->dma_buffer;
 239                 if (!buf->area)
 240                         continue;
 241                 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
 242                 buf->area = NULL;
 243         }
 244         if (sport_handle)
 245                 sport_done(sport_handle);
 246 }
 247
 248 static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
 249
 250 int bf5xx_pcm_i2s_new(struct snd_card *card, struct snd_soc_dai *dai,
 251         struct snd_pcm *pcm)
 252 {
 253         int ret = 0;
 254
 255         pr_debug("%s enter\n", __func__);
 256         if (!card->dev->dma_mask)
 257                 card->dev->dma_mask = &bf5xx_pcm_dmamask;
 258         if (!card->dev->coherent_dma_mask)
 259                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 260
 261         if (dai->playback.channels_min) {
 262                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 263                         SNDRV_PCM_STREAM_PLAYBACK);
 264                 if (ret)
 265                         goto out;
 266         }
 267
 268         if (dai->capture.channels_min) {
 269                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 270                         SNDRV_PCM_STREAM_CAPTURE);
 271                 if (ret)
 272                         goto out;
 273         }
 274  out:
 275         return ret;
 276 }
 277
 278 struct snd_soc_platform bf5xx_i2s_soc_platform = {
 279         .name           = "bf5xx-audio",
 280         .pcm_ops        = &bf5xx_pcm_i2s_ops,
 281         .pcm_new        = bf5xx_pcm_i2s_new,
 282         .pcm_free       = bf5xx_pcm_free_dma_buffers,
 283 };
 284 EXPORT_SYMBOL_GPL(bf5xx_i2s_soc_platform);
 285
 286 static int __init bfin_i2s_init(void)
 287 {
 288         return snd_soc_register_platform(&bf5xx_i2s_soc_platform);
 289 }
 290 module_init(bfin_i2s_init);
 291
 292 static void __exit bfin_i2s_exit(void)
 293 {
 294         snd_soc_unregister_platform(&bf5xx_i2s_soc_platform);
 295 }
 296 module_exit(bfin_i2s_exit);
 297
 298 MODULE_AUTHOR("Cliff Cai");
 299 MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
 300 MODULE_LICENSE("GPL");