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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Portalplayer specific code for I2S
*
* Based on code from the ipodlinux project - http://ipodlinux.org/
* Adapted for Rockbox in December 2005
*
* Original file: linux/arch/armnommu/mach-ipod/audio.c
*
* Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
*
* 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 "system.h"
#include "cpu.h"
#include "i2s.h"
#if CONFIG_CPU == PP5002
void i2s_reset(void)
{
/* I2S device reset */
DEV_RS |= DEV_I2S;
DEV_RS &= ~DEV_I2S;
/* I2S controller enable */
IISCONFIG |= IIS_ENABLE;
/* reset DAC and ADC fifo */
IISFIFO_CFG |= IIS_RXCLR | IIS_TXCLR;
}
#else /* PP502X */
/*
* Reset the I2S BIT.FORMAT I2S, 16bit, FIFO.FORMAT 32bit
*/
void i2s_reset(void)
{
/* I2S soft reset */
IISCONFIG |= IIS_RESET;
IISCONFIG &= ~IIS_RESET;
/* BIT.FORMAT */
IISCONFIG = ((IISCONFIG & ~IIS_FORMAT_MASK) | IIS_FORMAT_IIS);
/* BIT.SIZE */
IISCONFIG = ((IISCONFIG & ~IIS_SIZE_MASK) | IIS_SIZE_16BIT);
/* FIFO.FORMAT */
/* If BIT.SIZE < FIFO.FORMAT low bits will be 0 */
#ifdef HAVE_AS3514
/* AS3514 can only operate as I2S Slave */
IISCONFIG |= IIS_MASTER;
/* Set I2S to 44.1kHz */
IISCLK = (IISCLK & ~0x1ff) | 33;
IISDIV = 7;
#endif /* HAVE_AS3514 */
IISCONFIG = ((IISCONFIG & ~IIS_FIFO_FORMAT_MASK) | IIS_FIFO_FORMAT_LE16_2);
/* RX_ATN_LVL = when 12 slots full */
/* TX_ATN_LVL = when 12 slots empty */
IISFIFO_CFG |= IIS_RX_FULL_LVL_12 | IIS_TX_EMPTY_LVL_12;
/* Rx.CLR = 1, TX.CLR = 1 */
IISFIFO_CFG |= IIS_RXCLR | IIS_TXCLR;
}
#endif /* CONFIG_CPU == */
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