84 lines
3 KiB
C
84 lines
3 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2006 by Michal Sevakis
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* Based on the work of Thom Johansen
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdbool.h>
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#include "config.h"
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#include "cpu.h"
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#include "power.h"
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#include "system.h"
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#include "audio.h"
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#include "spdif.h"
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static int spdif_source = AUDIO_SRC_PLAYBACK;
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static int spdif_on = false;
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/* Initialize the S/PDIF driver */
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void spdif_init(void)
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{
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/* PHASECONFIG setup: gain = 3*2^13, source = EBUIN */
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PHASECONFIG = (6 << 3) | (4 << 0);
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spdif_set_output_source(AUDIO_SRC_PLAYBACK, true);
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}
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/* Return the S/PDIF frequency in herz - unrounded */
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unsigned long spdif_measure_frequency(void)
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{
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/* The following formula is specified in MCF5249 user's manual section
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* 17.6.1. The 128 divide is because of the fact that the SPDIF clock is
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* the sample rate times 128.
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*/
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return (unsigned long)((unsigned long long)FREQMEAS*CPU_FREQ /
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((1 << 15)*3*(1 << 13))/128);
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} /* spdif_measure_frequency */
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/* Set the S/PDIF audio feed */
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void spdif_set_output_source(int source, bool src_on)
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{
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static const unsigned short ebu1_config[] =
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{
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/* SCLK2, TXSRC = PDOR3, validity, normal operation */
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[AUDIO_SRC_PLAYBACK+1] = (7 << 12) | (3 << 8) | (1 << 5) | (5 << 2),
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/* Input source is EBUin1, Feed-through monitoring */
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[AUDIO_SRC_SPDIF+1] = (1 << 2),
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/* SCLK2, TXSRC = IIS1recv, validity, normal operation */
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[AUDIO_SRC_MIC+1] = (7 << 12) | (4 << 8) | (1 << 5) | (5 << 2),
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[AUDIO_SRC_LINEIN+1] = (7 << 12) | (4 << 8) | (1 << 5) | (5 << 2),
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[AUDIO_SRC_FMRADIO+1] = (7 << 12) | (4 << 8) | (1 << 5) | (5 << 2),
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};
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if ((unsigned)source >= ARRAYLEN(ebu1_config))
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source = AUDIO_SRC_PLAYBACK;
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EBU1CONFIG = 0x800; /* Reset before reprogram */
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spdif_source = source;
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spdif_on = spdif_powered() && src_on;
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/* Tranceiver must be powered or else monitoring will be disabled */
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EBU1CONFIG = spdif_on ? ebu1_config[source + 1] : 0;
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} /* spdif_set_output_source */
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/* Return the last set S/PDIF audio source */
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int spdif_get_output_source(bool *src_on)
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{
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if (src_on != NULL)
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*src_on = spdif_on;
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return spdif_source;
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} /* spdif_get_output_source */
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