sound/oss/omap-audio-dma-intfc.h

   1 /*
   2  * linux/sound/oss/omap-audio-dma-intfc.h
   3  *
   4  * Common audio DMA handling for the OMAP processors
   5  *
   6  * Copyright (C) 2004 Texas Instruments, Inc.
   7  *
   8  * Copyright (C) 2000, 2001 Nicolas Pitre <nico@cam.org>
   9  *
  10  * This package is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  16  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  17  *
  18  * History:
  19  *
  20  * 2004/08/12  Nishanth Menon - Modified to integrate Audio requirements on 1610,1710 platforms
  21  */
  22
  23 #ifndef __OMAP_AUDIO_DMA_INTFC_H
  24 #define __OMAP_AUDIO_DMA_INTFC_H
  25
  26 /************************** INCLUDES *************************************/
  27
  28 /* Requires omap-audio.h */
  29 #include "omap-audio.h"
  30
  31 /************************** GLOBAL MACROS *************************************/
  32
  33 /* Provide the Macro interfaces common across platforms */
  34 #define DMA_REQUEST(e,s, cb)    {e=omap_request_sound_dma(s->dma_dev, s->id, s, &s->lch);}
  35 #define DMA_FREE(s)             omap_free_sound_dma(s, &s->lch)
  36 #define DMA_CLEAR(s)            omap_clear_sound_dma(s)
  37
  38 /************************** GLOBAL DATA STRUCTURES *********************************/
  39
  40 typedef void (*dma_callback_t) (int lch, u16 ch_status, void *data);
  41
  42 /************************** GLOBAL FUNCTIONS ***************************************/
  43
  44 dma_callback_t audio_get_dma_callback(void);
  45 int audio_setup_buf(audio_stream_t * s);
  46 int audio_process_dma(audio_stream_t * s);
  47 void audio_prime_rx(audio_state_t * state);
  48 int audio_set_fragments(audio_stream_t * s, int val);
  49 int audio_sync(struct file *file);
  50 void audio_stop_dma(audio_stream_t * s);
  51 u_int audio_get_dma_pos(audio_stream_t * s);
  52 void audio_reset(audio_stream_t * s);
  53 void audio_discard_buf(audio_stream_t * s);
  54
  55 /**************** ARCH SPECIFIC FUNCIONS *******************************************/
  56
  57 void omap_clear_sound_dma(audio_stream_t * s);
  58
  59 int omap_request_sound_dma(int device_id, const char *device_name, void *data,
  60                            int **channels);
  61 int omap_free_sound_dma(void *data, int **channels);
  62
  63 #endif                          /* #ifndef __OMAP_AUDIO_DMA_INTFC_H */