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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2011 by Amaury Pouly
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "audiohw.h"
#include "pcm.h"
#include "dma-imx233.h"
#include "pcm-internal.h"
#include "audioout-imx233.h"
static int locked = 0;
static struct apb_dma_command_t dac_dma;
static bool pcm_freezed = false;
/**
* WARNING !
* Never reset the dma channel, otherwise it will halt the DAC for some reason
* */
static void play(const void *addr, size_t size)
{
dac_dma.next = NULL;
dac_dma.buffer = (void *)addr;
dac_dma.cmd = HW_APB_CHx_CMD__COMMAND__READ |
HW_APB_CHx_CMD__IRQONCMPLT |
HW_APB_CHx_CMD__SEMAPHORE |
size << HW_APB_CHx_CMD__XFER_COUNT_BP;
/* dma subsystem will make sure cached stuff is written to memory */
imx233_dma_start_command(APB_AUDIO_DAC, &dac_dma);
}
void INT_DAC_DMA(void)
{
const void *start;
size_t size;
if (pcm_play_dma_complete_callback(PCM_DMAST_OK, &start, &size))
{
play(start, size);
pcm_play_dma_status_callback(PCM_DMAST_STARTED);
}
imx233_dma_clear_channel_interrupt(APB_AUDIO_DAC);
}
void INT_DAC_ERROR(void)
{
/* TODO: Inform of error through pcm_play_dma_complete_callback */
}
void pcm_play_lock(void)
{
if(locked++ == 0)
imx233_dma_enable_channel_interrupt(APB_AUDIO_DAC, false);
}
void pcm_play_unlock(void)
{
if(--locked == 0)
imx233_dma_enable_channel_interrupt(APB_AUDIO_DAC, true);
}
void pcm_play_dma_stop(void)
{
}
void pcm_play_dma_start(const void *addr, size_t size)
{
pcm_play_dma_stop();
play(addr, size);
}
void pcm_play_dma_pause(bool pause)
{
imx233_dma_freeze_channel(APB_AUDIO_DAC, pause);
pcm_freezed = pause;
}
void pcm_play_dma_init(void)
{
audiohw_preinit();
}
void pcm_play_dma_postinit(void)
{
audiohw_postinit();
imx233_enable_interrupt(INT_SRC_DAC_DMA, true);
imx233_enable_interrupt(INT_SRC_DAC_ERROR, true);
imx233_dma_enable_channel_interrupt(APB_AUDIO_DAC, true);
}
void pcm_dma_apply_settings(void)
{
audiohw_set_frequency(pcm_fsel);
}
size_t pcm_get_bytes_waiting(void)
{
struct imx233_dma_info_t info = imx233_dma_get_info(APB_AUDIO_DAC, DMA_INFO_AHB_BYTES);
return info.ahb_bytes;
}
const void *pcm_play_dma_get_peak_buffer(int *count)
{
if(!pcm_freezed)
imx233_dma_freeze_channel(APB_AUDIO_DAC, true);
struct imx233_dma_info_t info = imx233_dma_get_info(APB_AUDIO_DAC, DMA_INFO_AHB_BYTES | DMA_INFO_BAR);
if(!pcm_freezed)
imx233_dma_freeze_channel(APB_AUDIO_DAC, false);
*count = info.ahb_bytes;
return (void *)info.bar;
}
/*
* Recording
*/
void pcm_rec_lock(void)
{
}
void pcm_rec_unlock(void)
{
}
void pcm_rec_dma_init(void)
{
}
void pcm_rec_dma_close(void)
{
}
void pcm_rec_dma_start(void *addr, size_t size)
{
(void) addr;
(void) size;
}
/*
void pcm_rec_dma_record_more(void *start, size_t size)
{
}
*/
void pcm_rec_dma_stop(void)
{
}
const void *pcm_rec_dma_get_peak_buffer(void)
{
return NULL;
}
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