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-i2s-pcm.h"
  43 #include "bf5xx-sport.h"
  44
  45 static void bf5xx_dma_irq(void *data)
  46 {
  47         struct snd_pcm_substream *pcm = data;
  48         snd_pcm_period_elapsed(pcm);
  49 }
  50
  51 static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
  52         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
  53                                    SNDRV_PCM_INFO_MMAP |
  54                                    SNDRV_PCM_INFO_MMAP_VALID |
  55                                    SNDRV_PCM_INFO_BLOCK_TRANSFER,
  56         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
  57                                    SNDRV_PCM_FMTBIT_S24_LE |
  58                                    SNDRV_PCM_FMTBIT_S32_LE,
  59         .period_bytes_min       = 32,
  60         .period_bytes_max       = 0x10000,
  61         .periods_min            = 1,
  62         .periods_max            = PAGE_SIZE/32,
  63         .buffer_bytes_max       = 0x20000, /* 128 kbytes */
  64         .fifo_size              = 16,
  65 };
  66
  67 static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
  68         struct snd_pcm_hw_params *params)
  69 {
  70         size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
  71         snd_pcm_lib_malloc_pages(substream, size);
  72
  73         return 0;
  74 }
  75
  76 static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
  77 {
  78         snd_pcm_lib_free_pages(substream);
  79
  80         return 0;
  81 }
  82
  83 static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
  84 {
  85         struct snd_pcm_runtime *runtime = substream->runtime;
  86         struct sport_device *sport = runtime->private_data;
  87         int period_bytes = frames_to_bytes(runtime, runtime->period_size);
  88
  89         pr_debug("%s enter\n", __func__);
  90         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  91                 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
  92                 sport_config_tx_dma(sport, runtime->dma_area,
  93                         runtime->periods, period_bytes);
  94         } else {
  95                 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
  96                 sport_config_rx_dma(sport, runtime->dma_area,
  97                         runtime->periods, period_bytes);
  98         }
  99
 100         return 0;
 101 }
 102
 103 static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 104 {
 105         struct snd_pcm_runtime *runtime = substream->runtime;
 106         struct sport_device *sport = runtime->private_data;
 107         int ret = 0;
 108
 109         pr_debug("%s enter\n", __func__);
 110         switch (cmd) {
 111         case SNDRV_PCM_TRIGGER_START:
 112                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 113                         sport_tx_start(sport);
 114                 else
 115                         sport_rx_start(sport);
 116                 break;
 117         case SNDRV_PCM_TRIGGER_STOP:
 118         case SNDRV_PCM_TRIGGER_SUSPEND:
 119         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 120                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 121                         sport_tx_stop(sport);
 122                 else
 123                         sport_rx_stop(sport);
 124                 break;
 125         default:
 126                 ret = -EINVAL;
 127         }
 128
 129         return ret;
 130 }
 131
 132 static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
 133 {
 134         struct snd_pcm_runtime *runtime = substream->runtime;
 135         struct sport_device *sport = runtime->private_data;
 136         unsigned int diff;
 137         snd_pcm_uframes_t frames;
 138         pr_debug("%s enter\n", __func__);
 139         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 140                 diff = sport_curr_offset_tx(sport);
 141         } else {
 142                 diff = sport_curr_offset_rx(sport);
 143         }
 144
 145         /*
 146          * TX at least can report one frame beyond the end of the
 147          * buffer if we hit the wraparound case - clamp to within the
 148          * buffer as the ALSA APIs require.
 149          */
 150         if (diff == snd_pcm_lib_buffer_bytes(substream))
 151                 diff = 0;
 152
 153         frames = bytes_to_frames(substream->runtime, diff);
 154
 155         return frames;
 156 }
 157
 158 static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
 159 {
 160         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 161         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 162         struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
 163         struct snd_pcm_runtime *runtime = substream->runtime;
 164         struct snd_dma_buffer *buf = &substream->dma_buffer;
 165         int ret;
 166
 167         pr_debug("%s enter\n", __func__);
 168
 169         snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
 170
 171         ret = snd_pcm_hw_constraint_integer(runtime,
 172                         SNDRV_PCM_HW_PARAM_PERIODS);
 173         if (ret < 0)
 174                 goto out;
 175
 176         if (sport_handle != NULL) {
 177                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 178                         sport_handle->tx_buf = buf->area;
 179                 else
 180                         sport_handle->rx_buf = buf->area;
 181
 182                 runtime->private_data = sport_handle;
 183         } else {
 184                 pr_err("sport_handle is NULL\n");
 185                 return -1;
 186         }
 187         return 0;
 188
 189  out:
 190         return ret;
 191 }
 192
 193 static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
 194         struct vm_area_struct *vma)
 195 {
 196         struct snd_pcm_runtime *runtime = substream->runtime;
 197         size_t size = vma->vm_end - vma->vm_start;
 198         vma->vm_start = (unsigned long)runtime->dma_area;
 199         vma->vm_end = vma->vm_start + size;
 200         vma->vm_flags |=  VM_SHARED;
 201
 202         return 0 ;
 203 }
 204
 205 static struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
 206         .open           = bf5xx_pcm_open,
 207         .ioctl          = snd_pcm_lib_ioctl,
 208         .hw_params      = bf5xx_pcm_hw_params,
 209         .hw_free        = bf5xx_pcm_hw_free,
 210         .prepare        = bf5xx_pcm_prepare,
 211         .trigger        = bf5xx_pcm_trigger,
 212         .pointer        = bf5xx_pcm_pointer,
 213         .mmap           = bf5xx_pcm_mmap,
 214 };
 215
 216 static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 217 {
 218         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 219         struct snd_dma_buffer *buf = &substream->dma_buffer;
 220         size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
 221
 222         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 223         buf->dev.dev = pcm->card->dev;
 224         buf->private_data = NULL;
 225         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 226                         &buf->addr, GFP_KERNEL);
 227         if (!buf->area) {
 228                 pr_err("Failed to allocate dma memory - Please increase uncached DMA memory region\n");
 229                 return -ENOMEM;
 230         }
 231         buf->bytes = size;
 232
 233         pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
 234                 buf->area, buf->bytes);
 235
 236         return 0;
 237 }
 238
 239 static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 240 {
 241         struct snd_pcm_substream *substream;
 242         struct snd_dma_buffer *buf;
 243         int stream;
 244
 245         for (stream = 0; stream < 2; stream++) {
 246                 substream = pcm->streams[stream].substream;
 247                 if (!substream)
 248                         continue;
 249
 250                 buf = &substream->dma_buffer;
 251                 if (!buf->area)
 252                         continue;
 253                 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
 254                 buf->area = NULL;
 255         }
 256 }
 257
 258 static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
 259
 260 int bf5xx_pcm_i2s_new(struct snd_soc_pcm_runtime *rtd)
 261 {
 262         struct snd_card *card = rtd->card->snd_card;
 263         struct snd_soc_dai *dai = rtd->cpu_dai;
 264         struct snd_pcm *pcm = rtd->pcm;
 265         int ret = 0;
 266
 267         pr_debug("%s enter\n", __func__);
 268         if (!card->dev->dma_mask)
 269                 card->dev->dma_mask = &bf5xx_pcm_dmamask;
 270         if (!card->dev->coherent_dma_mask)
 271                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 272
 273         if (dai->driver->playback.channels_min) {
 274                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 275                         SNDRV_PCM_STREAM_PLAYBACK);
 276                 if (ret)
 277                         goto out;
 278         }
 279
 280         if (dai->driver->capture.channels_min) {
 281                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 282                         SNDRV_PCM_STREAM_CAPTURE);
 283                 if (ret)
 284                         goto out;
 285         }
 286  out:
 287         return ret;
 288 }
 289
 290 static struct snd_soc_platform_driver bf5xx_i2s_soc_platform = {
 291         .ops            = &bf5xx_pcm_i2s_ops,
 292         .pcm_new        = bf5xx_pcm_i2s_new,
 293         .pcm_free       = bf5xx_pcm_free_dma_buffers,
 294 };
 295
 296 static int __devinit bfin_i2s_soc_platform_probe(struct platform_device *pdev)
 297 {
 298         return snd_soc_register_platform(&pdev->dev, &bf5xx_i2s_soc_platform);
 299 }
 300
 301 static int __devexit bfin_i2s_soc_platform_remove(struct platform_device *pdev)
 302 {
 303         snd_soc_unregister_platform(&pdev->dev);
 304         return 0;
 305 }
 306
 307 static struct platform_driver bfin_i2s_pcm_driver = {
 308         .driver = {
 309                 .name = "bfin-i2s-pcm-audio",
 310                 .owner = THIS_MODULE,
 311         },
 312
 313         .probe = bfin_i2s_soc_platform_probe,
 314         .remove = __devexit_p(bfin_i2s_soc_platform_remove),
 315 };
 316
 317 static int __init snd_bfin_i2s_pcm_init(void)
 318 {
 319         return platform_driver_register(&bfin_i2s_pcm_driver);
 320 }
 321 module_init(snd_bfin_i2s_pcm_init);
 322
 323 static void __exit snd_bfin_i2s_pcm_exit(void)
 324 {
 325         platform_driver_unregister(&bfin_i2s_pcm_driver);
 326 }
 327 module_exit(snd_bfin_i2s_pcm_exit);
 328
 329 MODULE_AUTHOR("Cliff Cai");
 330 MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
 331 MODULE_LICENSE("GPL");