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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 by Michal Sevakis
* Based on the work of Thom Johansen
*
* 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 <stdbool.h>
#include "config.h"
#include "cpu.h"
#include "power.h"
#include "system.h"
#include "audio.h"
#include "spdif.h"
static int spdif_source = AUDIO_SRC_PLAYBACK;
static int spdif_on = false;
/* Initialize the S/PDIF driver */
void spdif_init(void)
{
/* PHASECONFIG setup: gain = 3*2^13, source = EBUIN */
PHASECONFIG = (6 << 3) | (4 << 0);
spdif_set_output_source(AUDIO_SRC_PLAYBACK
IF_SPDIF_POWER_(, true));
}
/* Return the S/PDIF frequency in herz - unrounded */
unsigned long spdif_measure_frequency(void)
{
/* The following formula is specified in MCF5249 user's manual section
* 17.6.1. The 128 divide is because of the fact that the SPDIF clock is
* the sample rate times 128.
*/
return (unsigned long)((unsigned long long)FREQMEAS*CPU_FREQ /
((1 << 15)*3*(1 << 13))/128);
} /* spdif_measure_frequency */
/* Set the S/PDIF audio feed */
void spdif_set_output_source(int source, bool src_on)
{
static const unsigned short ebu1_config[AUDIO_NUM_SOURCES+1] =
{
/* SCLK2, TXSRC = PDOR3, validity, normal operation */
[AUDIO_SRC_PLAYBACK+1] = (3 << 8) | (1 << 5) | (5 << 2),
/* Input source is EBUin1, Feed-through monitoring */
[AUDIO_SRC_SPDIF+1] = (1 << 2),
/* SCLK2, TXSRC = IIS1recv, validity, normal operation */
[AUDIO_SRC_MIC+1] = (4 << 8) | (1 << 5) | (5 << 2),
[AUDIO_SRC_LINEIN+1] = (4 << 8) | (1 << 5) | (5 << 2),
[AUDIO_SRC_FMRADIO+1] = (4 << 8) | (1 << 5) | (5 << 2),
};
bool kick;
int level;
int iis2config = 0;
if ((unsigned)source >= ARRAYLEN(ebu1_config))
source = AUDIO_SRC_PLAYBACK;
spdif_source = source;
spdif_on = spdif_powered() && src_on;
/* Keep a DMA interrupt initiated stop from changing play state */
level = set_irq_level(DMA_IRQ_LEVEL);
kick = spdif_on && source == AUDIO_SRC_PLAYBACK
&& (DCR0 & DMA_EEXT);
/* FIFO must be in reset condition to reprogram bits 15-12 */
or_l(0x800, &EBU1CONFIG);
if (kick)
{
iis2config = IIS2CONFIG;
or_l(0x800, &IIS2CONFIG); /* Have to resync IIS2 TXSRC */
}
/* Tranceiver must be powered or else monitoring will be disabled.
CLOCKSEL bits only have relevance to normal operation so just
set them always. */
EBU1CONFIG = (spdif_on ? ebu1_config[source + 1] : 0) | (7 << 12);
if (kick)
{
IIS2CONFIG = iis2config;
PDOR3 = 0; /* A write to the FIFO kick-starts playback */
}
restore_irq(level);
} /* spdif_set_output_source */
/* Return the last set S/PDIF audio source */
int spdif_get_output_source(bool *src_on)
{
if (src_on != NULL)
*src_on = spdif_on;
return spdif_source;
} /* spdif_get_output_source */
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