sound/soc/davinci/davinci-pcm.c

   1 /*
   2  * ALSA PCM interface for the TI DAVINCI processor
   3  *
   4  * Author:      Vladimir Barinov, <vbarinov@embeddedalley.com>
   5  * Copyright:   (C) 2007 MontaVista Software, Inc., <source@mvista.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/slab.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/kernel.h>
  18
  19 #include <sound/core.h>
  20 #include <sound/pcm.h>
  21 #include <sound/pcm_params.h>
  22 #include <sound/soc.h>
  23
  24 #include <asm/dma.h>
  25
  26 #include "davinci-pcm.h"
  27
  28 static struct snd_pcm_hardware davinci_pcm_hardware = {
  29         .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
  30                  SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  31                  SNDRV_PCM_INFO_PAUSE),
  32         .formats = (SNDRV_PCM_FMTBIT_S16_LE),
  33         .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
  34                   SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
  35                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
  36                   SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
  37                   SNDRV_PCM_RATE_KNOT),
  38         .rate_min = 8000,
  39         .rate_max = 96000,
  40         .channels_min = 2,
  41         .channels_max = 2,
  42         .buffer_bytes_max = 128 * 1024,
  43         .period_bytes_min = 32,
  44         .period_bytes_max = 8 * 1024,
  45         .periods_min = 16,
  46         .periods_max = 255,
  47         .fifo_size = 0,
  48 };
  49
  50 struct davinci_runtime_data {
  51         spinlock_t lock;
  52         int period;             /* current DMA period */
  53         int master_lch;         /* Master DMA channel */
  54         int slave_lch;          /* Slave DMA channel */
  55         struct davinci_pcm_dma_params *params;  /* DMA params */
  56 };
  57
  58 static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
  59 {
  60         struct davinci_runtime_data *prtd = substream->runtime->private_data;
  61         struct snd_pcm_runtime *runtime = substream->runtime;
  62         int lch = prtd->slave_lch;
  63         unsigned int period_size;
  64         unsigned int dma_offset;
  65         dma_addr_t dma_pos;
  66         dma_addr_t src, dst;
  67         unsigned short src_bidx, dst_bidx;
  68         unsigned int data_type;
  69         unsigned int count;
  70
  71         period_size = snd_pcm_lib_period_bytes(substream);
  72         dma_offset = prtd->period * period_size;
  73         dma_pos = runtime->dma_addr + dma_offset;
  74
  75         pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
  76                 "dma_ptr = %x period_size=%x\n", lch, dma_pos, period_size);
  77
  78         data_type = prtd->params->data_type;
  79         count = period_size / data_type;
  80
  81         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  82                 src = dma_pos;
  83                 dst = prtd->params->dma_addr;
  84                 src_bidx = data_type;
  85                 dst_bidx = 0;
  86         } else {
  87                 src = prtd->params->dma_addr;
  88                 dst = dma_pos;
  89                 src_bidx = 0;
  90                 dst_bidx = data_type;
  91         }
  92
  93         davinci_set_dma_src_params(lch, src, INCR, W8BIT);
  94         davinci_set_dma_dest_params(lch, dst, INCR, W8BIT);
  95         davinci_set_dma_src_index(lch, src_bidx, 0);
  96         davinci_set_dma_dest_index(lch, dst_bidx, 0);
  97         davinci_set_dma_transfer_params(lch, data_type, count, 1, 0, ASYNC);
  98
  99         prtd->period++;
 100         if (unlikely(prtd->period >= runtime->periods))
 101                 prtd->period = 0;
 102 }
 103
 104 static void davinci_pcm_dma_irq(int lch, u16 ch_status, void *data)
 105 {
 106         struct snd_pcm_substream *substream = data;
 107         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 108
 109         pr_debug("davinci_pcm: lch=%d, status=0x%x\n", lch, ch_status);
 110
 111         if (unlikely(ch_status != DMA_COMPLETE))
 112                 return;
 113
 114         if (snd_pcm_running(substream)) {
 115                 snd_pcm_period_elapsed(substream);
 116
 117                 spin_lock(&prtd->lock);
 118                 davinci_pcm_enqueue_dma(substream);
 119                 spin_unlock(&prtd->lock);
 120         }
 121 }
 122
 123 static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
 124 {
 125         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 126         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 127         struct davinci_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data;
 128         int tcc = TCC_ANY;
 129         int ret;
 130
 131         if (!dma_data)
 132                 return -ENODEV;
 133
 134         prtd->params = dma_data;
 135
 136         /* Request master DMA channel */
 137         ret = davinci_request_dma(prtd->params->channel, prtd->params->name,
 138                                   davinci_pcm_dma_irq, substream,
 139                                   &prtd->master_lch, &tcc, EVENTQ_0);
 140         if (ret)
 141                 return ret;
 142
 143         /* Request slave DMA channel */
 144         ret = davinci_request_dma(PARAM_ANY, "Link",
 145                                   NULL, NULL, &prtd->slave_lch, &tcc, EVENTQ_0);
 146         if (ret) {
 147                 davinci_free_dma(prtd->master_lch);
 148                 return ret;
 149         }
 150
 151         /* Link slave DMA channel in loopback */
 152         davinci_dma_link_lch(prtd->slave_lch, prtd->slave_lch);
 153
 154         return 0;
 155 }
 156
 157 static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 158 {
 159         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 160         int ret = 0;
 161
 162         spin_lock(&prtd->lock);
 163
 164         switch (cmd) {
 165         case SNDRV_PCM_TRIGGER_START:
 166         case SNDRV_PCM_TRIGGER_RESUME:
 167         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 168                 davinci_start_dma(prtd->master_lch);
 169                 break;
 170         case SNDRV_PCM_TRIGGER_STOP:
 171         case SNDRV_PCM_TRIGGER_SUSPEND:
 172         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 173                 davinci_stop_dma(prtd->master_lch);
 174                 break;
 175         default:
 176                 ret = -EINVAL;
 177                 break;
 178         }
 179
 180         spin_unlock(&prtd->lock);
 181
 182         return ret;
 183 }
 184
 185 static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
 186 {
 187         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 188         struct paramentry_descriptor temp;
 189
 190         prtd->period = 0;
 191         davinci_pcm_enqueue_dma(substream);
 192
 193         /* Get slave channel dma params for master channel startup */
 194         davinci_get_dma_params(prtd->slave_lch, &temp);
 195         davinci_set_dma_params(prtd->master_lch, &temp);
 196
 197         return 0;
 198 }
 199
 200 static snd_pcm_uframes_t
 201 davinci_pcm_pointer(struct snd_pcm_substream *substream)
 202 {
 203         struct snd_pcm_runtime *runtime = substream->runtime;
 204         struct davinci_runtime_data *prtd = runtime->private_data;
 205         unsigned int offset;
 206         dma_addr_t count;
 207         dma_addr_t src, dst;
 208
 209         spin_lock(&prtd->lock);
 210
 211         davinci_dma_getposition(prtd->master_lch, &src, &dst);
 212         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 213                 count = src - runtime->dma_addr;
 214         else
 215                 count = dst - runtime->dma_addr;
 216
 217         spin_unlock(&prtd->lock);
 218
 219         offset = bytes_to_frames(runtime, count);
 220         if (offset >= runtime->buffer_size)
 221                 offset = 0;
 222
 223         return offset;
 224 }
 225
 226 static int davinci_pcm_open(struct snd_pcm_substream *substream)
 227 {
 228         struct snd_pcm_runtime *runtime = substream->runtime;
 229         struct davinci_runtime_data *prtd;
 230         int ret = 0;
 231
 232         snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware);
 233
 234         prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
 235         if (prtd == NULL)
 236                 return -ENOMEM;
 237
 238         spin_lock_init(&prtd->lock);
 239
 240         runtime->private_data = prtd;
 241
 242         ret = davinci_pcm_dma_request(substream);
 243         if (ret) {
 244                 printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
 245                 kfree(prtd);
 246         }
 247
 248         return ret;
 249 }
 250
 251 static int davinci_pcm_close(struct snd_pcm_substream *substream)
 252 {
 253         struct snd_pcm_runtime *runtime = substream->runtime;
 254         struct davinci_runtime_data *prtd = runtime->private_data;
 255
 256         davinci_dma_unlink_lch(prtd->slave_lch, prtd->slave_lch);
 257
 258         davinci_free_dma(prtd->slave_lch);
 259         davinci_free_dma(prtd->master_lch);
 260
 261         kfree(prtd);
 262
 263         return 0;
 264 }
 265
 266 static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
 267                                  struct snd_pcm_hw_params *hw_params)
 268 {
 269         return snd_pcm_lib_malloc_pages(substream,
 270                                         params_buffer_bytes(hw_params));
 271 }
 272
 273 static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
 274 {
 275         return snd_pcm_lib_free_pages(substream);
 276 }
 277
 278 static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
 279                             struct vm_area_struct *vma)
 280 {
 281         struct snd_pcm_runtime *runtime = substream->runtime;
 282
 283         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 284                                      runtime->dma_area,
 285                                      runtime->dma_addr,
 286                                      runtime->dma_bytes);
 287 }
 288
 289 static struct snd_pcm_ops davinci_pcm_ops = {
 290         .open =         davinci_pcm_open,
 291         .close =        davinci_pcm_close,
 292         .ioctl =        snd_pcm_lib_ioctl,
 293         .hw_params =    davinci_pcm_hw_params,
 294         .hw_free =      davinci_pcm_hw_free,
 295         .prepare =      davinci_pcm_prepare,
 296         .trigger =      davinci_pcm_trigger,
 297         .pointer =      davinci_pcm_pointer,
 298         .mmap =         davinci_pcm_mmap,
 299 };
 300
 301 static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
 302 {
 303         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 304         struct snd_dma_buffer *buf = &substream->dma_buffer;
 305         size_t size = davinci_pcm_hardware.buffer_bytes_max;
 306
 307         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 308         buf->dev.dev = pcm->card->dev;
 309         buf->private_data = NULL;
 310         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 311                                            &buf->addr, GFP_KERNEL);
 312
 313         pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
 314                 "size=%d\n", (void *) buf->area, (void *) buf->addr, size);
 315
 316         if (!buf->area)
 317                 return -ENOMEM;
 318
 319         buf->bytes = size;
 320         return 0;
 321 }
 322
 323 static void davinci_pcm_free(struct snd_pcm *pcm)
 324 {
 325         struct snd_pcm_substream *substream;
 326         struct snd_dma_buffer *buf;
 327         int stream;
 328
 329         for (stream = 0; stream < 2; stream++) {
 330                 substream = pcm->streams[stream].substream;
 331                 if (!substream)
 332                         continue;
 333
 334                 buf = &substream->dma_buffer;
 335                 if (!buf->area)
 336                         continue;
 337
 338                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 339                                       buf->area, buf->addr);
 340                 buf->area = NULL;
 341         }
 342 }
 343
 344 static u64 davinci_pcm_dmamask = 0xffffffff;
 345
 346 static int davinci_pcm_new(struct snd_card *card,
 347                            struct snd_soc_dai *dai, struct snd_pcm *pcm)
 348 {
 349         int ret;
 350
 351         if (!card->dev->dma_mask)
 352                 card->dev->dma_mask = &davinci_pcm_dmamask;
 353         if (!card->dev->coherent_dma_mask)
 354                 card->dev->coherent_dma_mask = 0xffffffff;
 355
 356         if (dai->playback.channels_min) {
 357                 ret = davinci_pcm_preallocate_dma_buffer(pcm,
 358                         SNDRV_PCM_STREAM_PLAYBACK);
 359                 if (ret)
 360                         return ret;
 361         }
 362
 363         if (dai->capture.channels_min) {
 364                 ret = davinci_pcm_preallocate_dma_buffer(pcm,
 365                         SNDRV_PCM_STREAM_CAPTURE);
 366                 if (ret)
 367                         return ret;
 368         }
 369
 370         return 0;
 371 }
 372
 373 struct snd_soc_platform davinci_soc_platform = {
 374         .name =         "davinci-audio",
 375         .pcm_ops =      &davinci_pcm_ops,
 376         .pcm_new =      davinci_pcm_new,
 377         .pcm_free =     davinci_pcm_free,
 378 };
 379 EXPORT_SYMBOL_GPL(davinci_soc_platform);
 380
 381 static int __init davinci_soc_platform_init(void)
 382 {
 383         return snd_soc_register_platform(&davinci_soc_platform);
 384 }
 385 module_init(davinci_soc_platform_init);
 386
 387 static void __exit davinci_soc_platform_exit(void)
 388 {
 389         snd_soc_unregister_platform(&davinci_soc_platform);
 390 }
 391 module_exit(davinci_soc_platform_exit);
 392
 393 MODULE_AUTHOR("Vladimir Barinov");
 394 MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
 395 MODULE_LICENSE("GPL");