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/dma-mapping.h>
  33 #include <linux/gfp.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-sport.h"
  43
  44 static void bf5xx_dma_irq(void *data)
  45 {
  46         struct snd_pcm_substream *pcm = data;
  47         snd_pcm_period_elapsed(pcm);
  48 }
  49
  50 static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
  51         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
  52                                    SNDRV_PCM_INFO_MMAP |
  53                                    SNDRV_PCM_INFO_MMAP_VALID |
  54                                    SNDRV_PCM_INFO_BLOCK_TRANSFER,
  55         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  56                                    SNDRV_PCM_FMTBIT_S24_LE |
  57                                    SNDRV_PCM_FMTBIT_S32_LE,
  58         .period_bytes_min       = 32,
  59         .period_bytes_max       = 0x10000,
  60         .periods_min            = 1,
  61         .periods_max            = PAGE_SIZE/32,
  62         .buffer_bytes_max       = 0x20000, /* 128 kbytes */
  63         .fifo_size              = 16,
  64 };
  65
  66 static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
  67         struct snd_pcm_hw_params *params)
  68 {
  69         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
  70 }
  71
  72 static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
  73 {
  74         snd_pcm_lib_free_pages(substream);
  75
  76         return 0;
  77 }
  78
  79 static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
  80 {
  81         struct snd_pcm_runtime *runtime = substream->runtime;
  82         struct sport_device *sport = runtime->private_data;
  83         int period_bytes = frames_to_bytes(runtime, runtime->period_size);
  84
  85         pr_debug("%s enter\n", __func__);
  86         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  87                 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
  88                 sport_config_tx_dma(sport, runtime->dma_area,
  89                         runtime->periods, period_bytes);
  90         } else {
  91                 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
  92                 sport_config_rx_dma(sport, runtime->dma_area,
  93                         runtime->periods, period_bytes);
  94         }
  95
  96         return 0;
  97 }
  98
  99 static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 100 {
 101         struct snd_pcm_runtime *runtime = substream->runtime;
 102         struct sport_device *sport = runtime->private_data;
 103         int ret = 0;
 104
 105         pr_debug("%s enter\n", __func__);
 106         switch (cmd) {
 107         case SNDRV_PCM_TRIGGER_START:
 108                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 109                         sport_tx_start(sport);
 110                 else
 111                         sport_rx_start(sport);
 112                 break;
 113         case SNDRV_PCM_TRIGGER_STOP:
 114         case SNDRV_PCM_TRIGGER_SUSPEND:
 115         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 116                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 117                         sport_tx_stop(sport);
 118                 else
 119                         sport_rx_stop(sport);
 120                 break;
 121         default:
 122                 ret = -EINVAL;
 123         }
 124
 125         return ret;
 126 }
 127
 128 static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
 129 {
 130         struct snd_pcm_runtime *runtime = substream->runtime;
 131         struct sport_device *sport = runtime->private_data;
 132         unsigned int diff;
 133         snd_pcm_uframes_t frames;
 134         pr_debug("%s enter\n", __func__);
 135         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 136                 diff = sport_curr_offset_tx(sport);
 137         } else {
 138                 diff = sport_curr_offset_rx(sport);
 139         }
 140
 141         /*
 142          * TX at least can report one frame beyond the end of the
 143          * buffer if we hit the wraparound case - clamp to within the
 144          * buffer as the ALSA APIs require.
 145          */
 146         if (diff == snd_pcm_lib_buffer_bytes(substream))
 147                 diff = 0;
 148
 149         frames = bytes_to_frames(substream->runtime, diff);
 150
 151         return frames;
 152 }
 153
 154 static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
 155 {
 156         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 157         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 158         struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
 159         struct snd_pcm_runtime *runtime = substream->runtime;
 160         struct snd_dma_buffer *buf = &substream->dma_buffer;
 161         int ret;
 162
 163         pr_debug("%s enter\n", __func__);
 164
 165         snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
 166
 167         ret = snd_pcm_hw_constraint_integer(runtime,
 168                         SNDRV_PCM_HW_PARAM_PERIODS);
 169         if (ret < 0)
 170                 goto out;
 171
 172         if (sport_handle != NULL) {
 173                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 174                         sport_handle->tx_buf = buf->area;
 175                 else
 176                         sport_handle->rx_buf = buf->area;
 177
 178                 runtime->private_data = sport_handle;
 179         } else {
 180                 pr_err("sport_handle is NULL\n");
 181                 return -1;
 182         }
 183         return 0;
 184
 185  out:
 186         return ret;
 187 }
 188
 189 static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
 190         struct vm_area_struct *vma)
 191 {
 192         struct snd_pcm_runtime *runtime = substream->runtime;
 193         size_t size = vma->vm_end - vma->vm_start;
 194         vma->vm_start = (unsigned long)runtime->dma_area;
 195         vma->vm_end = vma->vm_start + size;
 196         vma->vm_flags |=  VM_SHARED;
 197
 198         return 0 ;
 199 }
 200
 201 static struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
 202         .open           = bf5xx_pcm_open,
 203         .ioctl          = snd_pcm_lib_ioctl,
 204         .hw_params      = bf5xx_pcm_hw_params,
 205         .hw_free        = bf5xx_pcm_hw_free,
 206         .prepare        = bf5xx_pcm_prepare,
 207         .trigger        = bf5xx_pcm_trigger,
 208         .pointer        = bf5xx_pcm_pointer,
 209         .mmap           = bf5xx_pcm_mmap,
 210 };
 211
 212 static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 213 {
 214         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 215         struct snd_dma_buffer *buf = &substream->dma_buffer;
 216         size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
 217
 218         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 219         buf->dev.dev = pcm->card->dev;
 220         buf->private_data = NULL;
 221         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 222                         &buf->addr, GFP_KERNEL);
 223         if (!buf->area) {
 224                 pr_err("Failed to allocate dma memory - Please increase uncached DMA memory region\n");
 225                 return -ENOMEM;
 226         }
 227         buf->bytes = size;
 228
 229         pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
 230                 buf->area, buf->bytes);
 231
 232         return 0;
 233 }
 234
 235 static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 236 {
 237         struct snd_pcm_substream *substream;
 238         struct snd_dma_buffer *buf;
 239         int stream;
 240
 241         for (stream = 0; stream < 2; stream++) {
 242                 substream = pcm->streams[stream].substream;
 243                 if (!substream)
 244                         continue;
 245
 246                 buf = &substream->dma_buffer;
 247                 if (!buf->area)
 248                         continue;
 249                 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
 250                 buf->area = NULL;
 251         }
 252 }
 253
 254 static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
 255
 256 static int bf5xx_pcm_i2s_new(struct snd_soc_pcm_runtime *rtd)
 257 {
 258         struct snd_card *card = rtd->card->snd_card;
 259         struct snd_pcm *pcm = rtd->pcm;
 260         int ret = 0;
 261
 262         pr_debug("%s enter\n", __func__);
 263         if (!card->dev->dma_mask)
 264                 card->dev->dma_mask = &bf5xx_pcm_dmamask;
 265         if (!card->dev->coherent_dma_mask)
 266                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 267
 268         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 269                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 270                         SNDRV_PCM_STREAM_PLAYBACK);
 271                 if (ret)
 272                         goto out;
 273         }
 274
 275         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 276                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 277                         SNDRV_PCM_STREAM_CAPTURE);
 278                 if (ret)
 279                         goto out;
 280         }
 281  out:
 282         return ret;
 283 }
 284
 285 static struct snd_soc_platform_driver bf5xx_i2s_soc_platform = {
 286         .ops            = &bf5xx_pcm_i2s_ops,
 287         .pcm_new        = bf5xx_pcm_i2s_new,
 288         .pcm_free       = bf5xx_pcm_free_dma_buffers,
 289 };
 290
 291 static int bfin_i2s_soc_platform_probe(struct platform_device *pdev)
 292 {
 293         return snd_soc_register_platform(&pdev->dev, &bf5xx_i2s_soc_platform);
 294 }
 295
 296 static int bfin_i2s_soc_platform_remove(struct platform_device *pdev)
 297 {
 298         snd_soc_unregister_platform(&pdev->dev);
 299         return 0;
 300 }
 301
 302 static struct platform_driver bfin_i2s_pcm_driver = {
 303         .driver = {
 304                 .name = "bfin-i2s-pcm-audio",
 305                 .owner = THIS_MODULE,
 306         },
 307
 308         .probe = bfin_i2s_soc_platform_probe,
 309         .remove = bfin_i2s_soc_platform_remove,
 310 };
 311
 312 module_platform_driver(bfin_i2s_pcm_driver);
 313
 314 MODULE_AUTHOR("Cliff Cai");
 315 MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
 316 MODULE_LICENSE("GPL");