acbbe82a24
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11700 a1c6a512-1295-4272-9138-f99709370657
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/***************************************************************************
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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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* Portalplayer specific code for I2S
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*
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* Based on code from the ipodlinux project - http://ipodlinux.org/
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* Adapted for Rockbox in December 2005
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*
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* Original file: linux/arch/armnommu/mach-ipod/audio.c
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*
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* Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
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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 "system.h"
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/* TODO: Add in PP5002 defs */
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#if CONFIG_CPU == PP5002
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void i2s_reset(void)
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{
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/* I2S device reset */
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DEV_RS |= 0x80;
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DEV_RS &= ~0x80;
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/* I2S controller enable */
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IISCONFIG |= 1;
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/* BIT.FORMAT [11:10] = I2S (default) */
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/* BIT.SIZE [9:8] = 24bit */
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/* FIFO.FORMAT = 24 bit LSB */
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/* reset DAC and ADC fifo */
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IISFIFO_CFG |= 0x30000;
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}
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#else /* PP502X */
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/* Data format on the I2S bus */
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#define FORMAT_MASK (0x3 << 10)
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#define FORMAT_I2S (0x00 << 10)
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/* Other formats not yet known */
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/* Data size on I2S bus */
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#define SIZE_MASK (0x3 << 8)
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#define SIZE_16BIT (0x00 << 10)
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/* Other sizes not yet known */
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/* Data size/format on I2S FIFO */
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#define FIFO_FORMAT_MASK (0x7 << 4)
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#define FIFO_FORMAT_32LSB (0x03 << 4)
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/* Other formats not yet known */
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/* Are we I2S Master or slave? */
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#define I2S_MASTER (0x25)
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#define I2S_RESET (0x1 << 31)
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/*
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* Reset the I2S BIT.FORMAT I2S, 16bit, FIFO.FORMAT 32bit
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*/
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void i2s_reset(void)
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{
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/* I2S soft reset */
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IISCONFIG |= I2S_RESET;
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IISCONFIG &= ~I2S_RESET;
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/* BIT.FORMAT */
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IISCONFIG = ((IISCONFIG & ~FORMAT_MASK) | FORMAT_I2S);
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/* BIT.SIZE */
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IISCONFIG = ((IISCONFIG & ~SIZE_MASK) | SIZE_16BIT);
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/* FIFO.FORMAT */
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/* If BIT.SIZE < FIFO.FORMAT low bits will be 0 */
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IISCONFIG = ((IISCONFIG & ~FIFO_FORMAT_MASK) | FIFO_FORMAT_32LSB);
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/* RX_ATN_LVL=1 == when 12 slots full */
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/* TX_ATN_LVL=1 == when 12 slots empty */
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IISFIFO_CFG |= 0x33;
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/* Rx.CLR = 1, TX.CLR = 1 */
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IISFIFO_CFG |= 0x1100;
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}
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#endif
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