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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)
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "system.h"
/* TODO: Add in PP5002 defs */
#if CONFIG_CPU == PP5002
void i2s_reset(void)
{
/* I2S device reset */
DEV_RS |= 0x80;
DEV_RS &= ~0x80;
/* I2S controller enable */
IISCONFIG |= 1;
/* BIT.FORMAT [11:10] = I2S (default) */
/* BIT.SIZE [9:8] = 24bit */
/* FIFO.FORMAT = 24 bit LSB */
/* reset DAC and ADC fifo */
IISFIFO_CFG |= 0x30000;
}
#else /* PP502X */
/* Data format on the I2S bus */
#define FORMAT_MASK (0x3 << 10)
#define FORMAT_I2S (0x00 << 10)
/* Other formats not yet known */
/* Data size on I2S bus */
#define SIZE_MASK (0x3 << 8)
#define SIZE_16BIT (0x00 << 10)
/* Other sizes not yet known */
/* Data size/format on I2S FIFO */
#define FIFO_FORMAT_MASK (0x7 << 4)
#define FIFO_FORMAT_32LSB (0x03 << 4)
/* Other formats not yet known */
/* Are we I2S Master or slave? */
#define I2S_MASTER (1<<25)
#define I2S_RESET (0x1 << 31)
/*
* Reset the I2S BIT.FORMAT I2S, 16bit, FIFO.FORMAT 32bit
*/
void i2s_reset(void)
{
/* I2S soft reset */
IISCONFIG |= I2S_RESET;
IISCONFIG &= ~I2S_RESET;
/* BIT.FORMAT */
IISCONFIG = ((IISCONFIG & ~FORMAT_MASK) | FORMAT_I2S);
/* BIT.SIZE */
IISCONFIG = ((IISCONFIG & ~SIZE_MASK) | SIZE_16BIT);
/* FIFO.FORMAT */
/* If BIT.SIZE < FIFO.FORMAT low bits will be 0 */
IISCONFIG = ((IISCONFIG & ~FIFO_FORMAT_MASK) | FIFO_FORMAT_32LSB);
/* RX_ATN_LVL=1 == when 12 slots full */
/* TX_ATN_LVL=1 == when 12 slots empty */
IISFIFO_CFG |= 0x33;
/* Rx.CLR = 1, TX.CLR = 1 */
IISFIFO_CFG |= 0x1100;
}
#endif
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