target/linux/xburst/files-2.6.32/sound/soc/jz4740/jz4740-pcm.c

   1 /*
   2  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
   3  *
   4  *  This program is free software; you can redistribute  it and/or modify it
   5  *  under  the terms of  the GNU General  Public License as published by the
   6  *  Free Software Foundation;  either version 2 of the  License, or (at your
   7  *  option) any later version.
   8  *
   9  *  You should have received a copy of the  GNU General Public License along
  10  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  11  *  675 Mass Ave, Cambridge, MA 02139, USA.
  12  *
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/dma-mapping.h>
  20
  21 #include <sound/core.h>
  22 #include <sound/pcm.h>
  23 #include <sound/pcm_params.h>
  24 #include <sound/soc.h>
  25
  26 #include <asm/mach-jz4740/dma.h>
  27 #include "jz4740-pcm.h"
  28
  29 struct jz4740_runtime_data {
  30         unsigned int dma_period;
  31         dma_addr_t dma_start;
  32         dma_addr_t dma_pos;
  33         dma_addr_t dma_end;
  34
  35         struct jz4740_dma_chan *dma;
  36
  37         dma_addr_t fifo_addr;
  38 };
  39
  40 /* identify hardware playback capabilities */
  41 static const struct snd_pcm_hardware jz4740_pcm_hardware = {
  42         .info = SNDRV_PCM_INFO_MMAP |
  43                 SNDRV_PCM_INFO_MMAP_VALID |
  44                 SNDRV_PCM_INFO_INTERLEAVED |
  45                 SNDRV_PCM_INFO_BLOCK_TRANSFER,
  46         .formats = SNDRV_PCM_FMTBIT_S16_LE |
  47                    SNDRV_PCM_FMTBIT_S8,
  48         .rates                  = SNDRV_PCM_RATE_8000_48000,
  49         .channels_min           = 1,
  50         .channels_max           = 2,
  51         .period_bytes_min       = 32,
  52         .period_bytes_max       = 2 * PAGE_SIZE,
  53         .periods_min            = 2,
  54         .periods_max            = 128,
  55         .buffer_bytes_max       = 128 * 2 * PAGE_SIZE,
  56         .fifo_size                      = 32,
  57 };
  58
  59 static void jz4740_pcm_start_transfer(struct jz4740_runtime_data *prtd, int stream)
  60 {
  61         unsigned int count;
  62
  63         if (prtd->dma_pos + prtd->dma_period > prtd->dma_end)
  64                 count = prtd->dma_end - prtd->dma_pos;
  65         else
  66                 count = prtd->dma_period;
  67
  68         jz4740_dma_disable(prtd->dma);
  69
  70         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
  71                 jz4740_dma_set_src_addr(prtd->dma, prtd->dma_pos);
  72                 jz4740_dma_set_dst_addr(prtd->dma, prtd->fifo_addr);
  73         } else {
  74                 jz4740_dma_set_src_addr(prtd->dma, prtd->fifo_addr);
  75                 jz4740_dma_set_dst_addr(prtd->dma, prtd->dma_pos);
  76         }
  77
  78         jz4740_dma_set_transfer_count(prtd->dma, count);
  79
  80         jz4740_dma_enable(prtd->dma);
  81
  82         prtd->dma_pos += prtd->dma_period;
  83         if (prtd->dma_pos >= prtd->dma_end)
  84                 prtd->dma_pos = prtd->dma_start;
  85 }
  86
  87 static void jz4740_pcm_dma_transfer_done(struct jz4740_dma_chan *dma, int err,
  88                                          void *dev_id)
  89 {
  90         struct snd_pcm_substream *substream = dev_id;
  91         struct snd_pcm_runtime *runtime = substream->runtime;
  92         struct jz4740_runtime_data *prtd = runtime->private_data;
  93
  94         snd_pcm_period_elapsed(substream);
  95
  96         jz4740_pcm_start_transfer(prtd, substream->stream);
  97 }
  98
  99 static int jz4740_pcm_hw_params(struct snd_pcm_substream *substream,
 100         struct snd_pcm_hw_params *params)
 101 {
 102         struct snd_pcm_runtime *runtime = substream->runtime;
 103         struct jz4740_runtime_data *prtd = runtime->private_data;
 104         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 105         struct jz4740_pcm_config *config;
 106
 107         config = rtd->dai->cpu_dai->dma_data;
 108         if (!prtd->dma) {
 109                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 110                         prtd->dma = jz4740_dma_request(substream, "PCM Playback");
 111                 else
 112                         prtd->dma = jz4740_dma_request(substream, "PCM Capture");
 113         }
 114
 115         if (!prtd->dma)
 116                 return -EBUSY;
 117
 118         jz4740_dma_configure(prtd->dma, config->dma_config);
 119         prtd->fifo_addr = config->fifo_addr;
 120
 121         jz4740_dma_set_complete_cb(prtd->dma, jz4740_pcm_dma_transfer_done);
 122
 123         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 124         runtime->dma_bytes = params_buffer_bytes(params);
 125
 126         prtd->dma_period = params_period_bytes(params);
 127         prtd->dma_start = runtime->dma_addr;
 128         prtd->dma_pos = prtd->dma_start;
 129         prtd->dma_end = prtd->dma_start + runtime->dma_bytes;
 130
 131         return 0;
 132 }
 133
 134 static int jz4740_pcm_hw_free(struct snd_pcm_substream *substream)
 135 {
 136         struct jz4740_runtime_data *prtd = substream->runtime->private_data;
 137
 138         snd_pcm_set_runtime_buffer(substream, NULL);
 139         if (prtd->dma)
 140                 jz4740_dma_free(prtd->dma);
 141
 142         return 0;
 143 }
 144
 145 static int jz4740_pcm_prepare(struct snd_pcm_substream *substream)
 146 {
 147         struct jz4740_runtime_data *prtd = substream->runtime->private_data;
 148         int ret = 0;
 149
 150         if (!prtd->dma)
 151                 return 0;
 152
 153         prtd->dma_pos = prtd->dma_start;
 154
 155         return ret;
 156 }
 157
 158 static int jz4740_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 159 {
 160         struct snd_pcm_runtime *runtime = substream->runtime;
 161         struct jz4740_runtime_data *prtd = runtime->private_data;
 162
 163         int ret = 0;
 164
 165         switch (cmd) {
 166         case SNDRV_PCM_TRIGGER_START:
 167         case SNDRV_PCM_TRIGGER_RESUME:
 168         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 169                 jz4740_pcm_start_transfer(prtd, substream->stream);
 170                 break;
 171         case SNDRV_PCM_TRIGGER_STOP:
 172         case SNDRV_PCM_TRIGGER_SUSPEND:
 173         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 174                 jz4740_dma_disable(prtd->dma);
 175                 break;
 176         default:
 177                 ret = -EINVAL;
 178         }
 179
 180         return ret;
 181 }
 182
 183 static snd_pcm_uframes_t jz4740_pcm_pointer(struct snd_pcm_substream *substream)
 184 {
 185         struct snd_pcm_runtime *runtime = substream->runtime;
 186         struct jz4740_runtime_data *prtd = runtime->private_data;
 187         unsigned long count, pos;
 188         snd_pcm_uframes_t offset;
 189         struct jz4740_dma_chan *dma = prtd->dma;
 190
 191         count = jz4740_dma_get_residue(dma);
 192         if (prtd->dma_pos == prtd->dma_start)
 193                 pos = prtd->dma_end - prtd->dma_start - count;
 194         else
 195                 pos = prtd->dma_pos - prtd->dma_start - count;
 196
 197         offset = bytes_to_frames(runtime, pos);
 198         if (offset >= runtime->buffer_size)
 199                 offset = 0;
 200
 201         return offset;
 202 }
 203
 204 static int jz4740_pcm_open(struct snd_pcm_substream *substream)
 205 {
 206         struct snd_pcm_runtime *runtime = substream->runtime;
 207         struct jz4740_runtime_data *prtd;
 208
 209         snd_soc_set_runtime_hwparams(substream, &jz4740_pcm_hardware);
 210         prtd = kzalloc(sizeof(struct jz4740_runtime_data), GFP_KERNEL);
 211
 212         if (prtd == NULL)
 213                 return -ENOMEM;
 214
 215         runtime->private_data = prtd;
 216         return 0;
 217 }
 218
 219 static int jz4740_pcm_close(struct snd_pcm_substream *substream)
 220 {
 221         struct snd_pcm_runtime *runtime = substream->runtime;
 222         struct jz4740_runtime_data *prtd = runtime->private_data;
 223
 224         kfree(prtd);
 225
 226         return 0;
 227 }
 228
 229 static int jz4740_pcm_mmap(struct snd_pcm_substream *substream,
 230                            struct vm_area_struct *vma)
 231 {
 232         return remap_pfn_range(vma, vma->vm_start,
 233                        substream->dma_buffer.addr >> PAGE_SHIFT,
 234                        vma->vm_end - vma->vm_start, vma->vm_page_prot);
 235 }
 236
 237 static struct snd_pcm_ops jz4740_pcm_ops = {
 238         .open           = jz4740_pcm_open,
 239         .close          = jz4740_pcm_close,
 240         .ioctl          = snd_pcm_lib_ioctl,
 241         .hw_params      = jz4740_pcm_hw_params,
 242         .hw_free        = jz4740_pcm_hw_free,
 243         .prepare        = jz4740_pcm_prepare,
 244         .trigger        = jz4740_pcm_trigger,
 245         .pointer        = jz4740_pcm_pointer,
 246         .mmap           = jz4740_pcm_mmap,
 247 };
 248
 249 static int jz4740_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 250 {
 251         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 252         struct snd_dma_buffer *buf = &substream->dma_buffer;
 253         size_t size = jz4740_pcm_hardware.buffer_bytes_max;
 254
 255         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 256         buf->dev.dev = pcm->card->dev;
 257         buf->private_data = NULL;
 258
 259         buf->area = dma_alloc_noncoherent(pcm->card->dev, size,
 260                                           &buf->addr, GFP_KERNEL);
 261         if (!buf->area)
 262                 return -ENOMEM;
 263
 264         buf->bytes = size;
 265
 266         return 0;
 267 }
 268
 269 static void jz4740_pcm_free(struct snd_pcm *pcm)
 270 {
 271         struct snd_pcm_substream *substream;
 272         struct snd_dma_buffer *buf;
 273         int stream;
 274
 275         for (stream = 0; stream < 2; stream++) {
 276                 substream = pcm->streams[stream].substream;
 277                 if (!substream)
 278                         continue;
 279
 280                 buf = &substream->dma_buffer;
 281                 if (!buf->area)
 282                         continue;
 283
 284                 dma_free_noncoherent(pcm->card->dev, buf->bytes,
 285                   buf->area, buf->addr);
 286                 buf->area = NULL;
 287         }
 288 }
 289
 290 static u64 jz4740_pcm_dmamask = DMA_BIT_MASK(32);
 291
 292 int jz4740_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
 293         struct snd_pcm *pcm)
 294 {
 295         int ret = 0;
 296
 297         if (!card->dev->dma_mask)
 298                 card->dev->dma_mask = &jz4740_pcm_dmamask;
 299
 300         if (!card->dev->coherent_dma_mask)
 301                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 302
 303         if (dai->playback.channels_min) {
 304                 ret = jz4740_pcm_preallocate_dma_buffer(pcm,
 305                         SNDRV_PCM_STREAM_PLAYBACK);
 306                 if (ret)
 307                         goto err;
 308         }
 309
 310         if (dai->capture.channels_min) {
 311                 ret = jz4740_pcm_preallocate_dma_buffer(pcm,
 312                         SNDRV_PCM_STREAM_CAPTURE);
 313                 if (ret)
 314                         goto err;
 315         }
 316
 317 err:
 318         return ret;
 319 }
 320
 321 struct snd_soc_platform jz4740_soc_platform = {
 322         .name           = "jz4740-pcm",
 323         .pcm_ops        = &jz4740_pcm_ops,
 324         .pcm_new        = jz4740_pcm_new,
 325         .pcm_free       = jz4740_pcm_free,
 326 };
 327 EXPORT_SYMBOL_GPL(jz4740_soc_platform);
 328
 329 static int __init jz4740_soc_platform_init(void)
 330 {
 331     return snd_soc_register_platform(&jz4740_soc_platform);
 332 }
 333 module_init(jz4740_soc_platform_init);
 334
 335 static void __exit jz4740_soc_platform_exit(void)
 336 {
 337     snd_soc_unregister_platform(&jz4740_soc_platform);
 338 }
 339 module_exit(jz4740_soc_platform_exit);
 340
 341 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 342 MODULE_DESCRIPTION("Ingenic SoC JZ4740 PCM driver");
 343 MODULE_LICENSE("GPL");