omap-audio-dma-intfc.h

Linux Kernel 2.6.9 for OMAP1710

/*  
 * linux/sound/oss/omap-audio-dma-intfc.h
 *
 * Common audio DMA handling for the OMAP processors
 *
 * Copyright (C) 2004 Texas Instruments, Inc.
 *
 * Copyright (C) 2000, 2001 Nicolas Pitre <[e-mail]>
 *
 * This package is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * History:
 *
 * 2004/08/12  Nishanth Menon - Modified to integrate Audio requirements on 1610,1710
 *               and 2420 platforms.
 */

#ifndef __OMAP_AUDIO_DMA_INTFC_H
#define __OMAP_AUDIO_DMA_INTFC_H

/************************** INCLUDES *************************************/

/* Requires omap-audio.h */
#include "omap-audio.h"

/************************** GLOBAL MACROS *************************************/

/* Provide the Macro interfaces common across platforms */
#if CONFIG_ARCH_OMAP16XX

#define DMA_REQUEST(e,s, cb)   {e=omap_request_sound_dma(s->dma_dev, s->id, s, &s->lch);}
#define DMA_FREE(s)		       omap_free_sound_dma(&s->lch)
#define DMA_CLEAR(s)		   omap_clear_sound_dma(s)

#elif defined CONFIG_ARCH_OMAP24XX
/* number of channels for linking */
#define NUM_AUDIO_DMA_LCH       2
#define DMA_REQUEST(e,s, cb)   {int ch_alloc;e=omap_request_dma_chain (s->dma_dev, s->id, NUM_AUDIO_DMA_LCH, cb, s, &ch_alloc,&s->dma_chain);}
#define DMA_FREE(s)            omap_free_dma_chain(s->dma_chain);
#define DMA_CLEAR(s)           omap_clear_dma_chain(s->dma_chain);

#else

#error "Un Supported Configuration"

#endif				/* End of Provide the Macro interfaces common across platforms */

/************************** GLOBAL DATA STRUCTURES *********************************/

typedef void (*dma_callback_t) (int lch, u16 ch_status, void *data);

/************************** GLOBAL FUNCTIONS ***************************************/

dma_callback_t audio_get_dma_callback(void);
int audio_setup_buf(audio_stream_t * s);
int audio_process_dma(audio_stream_t * s);
void audio_prime_rx(audio_state_t * state);
int audio_set_fragments(audio_stream_t * s, int val);
int audio_sync(struct file *file);
void audio_stop_dma(audio_stream_t * s);
u_int audio_get_dma_pos(audio_stream_t * s);
void audio_reset(audio_stream_t * s);
void audio_discard_buf(audio_stream_t * s);

/**************** ARCH SPECIFIC FUNCIONS *******************************************/

#if CONFIG_ARCH_OMAP16XX
void omap_clear_sound_dma(audio_stream_t * s);

int omap_request_sound_dma(int device_id, const char *device_name, void *data,
			   int **channels);
int omap_free_sound_dma(int **channels);

#endif				/* End of #if CONFIG_ARCH_OMAP16XX */

#endif				/* #ifndef __OMAP_AUDIO_DMA_INTFC_H */