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         } else {
 143                 diff = sport_curr_offset_rx(sport);
 144         }
 145
 146         /*
 147          * TX at least can report one frame beyond the end of the
 148          * buffer if we hit the wraparound case - clamp to within the
 149          * buffer as the ALSA APIs require.
 150          */
 151         if (diff == snd_pcm_lib_buffer_bytes(substream))
 152                 diff = 0;
 153
 154         frames = bytes_to_frames(substream->runtime, diff);
 155
 156         return frames;
 157 }
 158
 159 static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
 160 {
 161         struct snd_pcm_runtime *runtime = substream->runtime;
 162         int ret;
 163
 164         pr_debug("%s enter\n", __func__);
 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                 runtime->private_data = sport_handle;
 174         else {
 175                 pr_err("sport_handle is NULL\n");
 176                 return -1;
 177         }
 178         return 0;
 179
 180  out:
 181         return ret;
 182 }
 183
 184 static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
 185         struct vm_area_struct *vma)
 186 {
 187         struct snd_pcm_runtime *runtime = substream->runtime;
 188         size_t size = vma->vm_end - vma->vm_start;
 189         vma->vm_start = (unsigned long)runtime->dma_area;
 190         vma->vm_end = vma->vm_start + size;
 191         vma->vm_flags |=  VM_SHARED;
 192
 193         return 0 ;
 194 }
 195
 196 static struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
 197         .open           = bf5xx_pcm_open,
 198         .ioctl          = snd_pcm_lib_ioctl,
 199         .hw_params      = bf5xx_pcm_hw_params,
 200         .hw_free        = bf5xx_pcm_hw_free,
 201         .prepare        = bf5xx_pcm_prepare,
 202         .trigger        = bf5xx_pcm_trigger,
 203         .pointer        = bf5xx_pcm_pointer,
 204         .mmap           = bf5xx_pcm_mmap,
 205 };
 206
 207 static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 208 {
 209         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 210         struct snd_dma_buffer *buf = &substream->dma_buffer;
 211         size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
 212
 213         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 214         buf->dev.dev = pcm->card->dev;
 215         buf->private_data = NULL;
 216         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 217                         &buf->addr, GFP_KERNEL);
 218         if (!buf->area) {
 219                 pr_err("Failed to allocate dma memory \
 220                         Please increase uncached DMA memory region\n");
 221                 return -ENOMEM;
 222         }
 223         buf->bytes = size;
 224
 225         pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
 226                 buf->area, buf->bytes);
 227
 228         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 229                 sport_handle->tx_buf = buf->area;
 230         else
 231                 sport_handle->rx_buf = buf->area;
 232
 233         return 0;
 234 }
 235
 236 static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
 237 {
 238         struct snd_pcm_substream *substream;
 239         struct snd_dma_buffer *buf;
 240         int stream;
 241
 242         for (stream = 0; stream < 2; stream++) {
 243                 substream = pcm->streams[stream].substream;
 244                 if (!substream)
 245                         continue;
 246
 247                 buf = &substream->dma_buffer;
 248                 if (!buf->area)
 249                         continue;
 250                 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
 251                 buf->area = NULL;
 252         }
 253         if (sport_handle)
 254                 sport_done(sport_handle);
 255 }
 256
 257 static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
 258
 259 int bf5xx_pcm_i2s_new(struct snd_card *card, struct snd_soc_dai *dai,
 260         struct snd_pcm *pcm)
 261 {
 262         int ret = 0;
 263
 264         pr_debug("%s enter\n", __func__);
 265         if (!card->dev->dma_mask)
 266                 card->dev->dma_mask = &bf5xx_pcm_dmamask;
 267         if (!card->dev->coherent_dma_mask)
 268                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 269
 270         if (dai->playback.channels_min) {
 271                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 272                         SNDRV_PCM_STREAM_PLAYBACK);
 273                 if (ret)
 274                         goto out;
 275         }
 276
 277         if (dai->capture.channels_min) {
 278                 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
 279                         SNDRV_PCM_STREAM_CAPTURE);
 280                 if (ret)
 281                         goto out;
 282         }
 283  out:
 284         return ret;
 285 }
 286
 287 struct snd_soc_platform bf5xx_i2s_soc_platform = {
 288         .name           = "bf5xx-audio",
 289         .pcm_ops        = &bf5xx_pcm_i2s_ops,
 290         .pcm_new        = bf5xx_pcm_i2s_new,
 291         .pcm_free       = bf5xx_pcm_free_dma_buffers,
 292 };
 293 EXPORT_SYMBOL_GPL(bf5xx_i2s_soc_platform);
 294
 295 static int __init bfin_i2s_init(void)
 296 {
 297         return snd_soc_register_platform(&bf5xx_i2s_soc_platform);
 298 }
 299 module_init(bfin_i2s_init);
 300
 301 static void __exit bfin_i2s_exit(void)
 302 {
 303         snd_soc_unregister_platform(&bf5xx_i2s_soc_platform);
 304 }
 305 module_exit(bfin_i2s_exit);
 306
 307 MODULE_AUTHOR("Cliff Cai");
 308 MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
 309 MODULE_LICENSE("GPL");