/*************************************************************************** * __________ __ ___. * 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 (0x25) #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