firmware/target/arm/i2s-pp.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Portalplayer specific code for I2S
  11  *
  12  * Based on code from the ipodlinux project - http://ipodlinux.org/
  13  * Adapted for Rockbox in December 2005
  14  *
  15  * Original file: linux/arch/armnommu/mach-ipod/audio.c
  16  *
  17  * Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
  18  *
  19  * This program is free software; you can redistribute it and/or
  20  * modify it under the terms of the GNU General Public License
  21  * as published by the Free Software Foundation; either version 2
  22  * of the License, or (at your option) any later version.
  23  *
  24  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  25  * KIND, either express or implied.
  26  *
  27  ****************************************************************************/
  28 #include "system.h"
  29 #include "cpu.h"
  30 #include "i2s.h"
  31
  32 #if CONFIG_CPU == PP5002
  33 void i2s_reset(void)
  34 {
  35     /* I2S device reset */
  36     DEV_RS |= DEV_I2S;
  37     DEV_RS &= ~DEV_I2S;
  38
  39     /* I2S controller enable */
  40     IISCONFIG |= IIS_ENABLE;
  41
  42     /* reset DAC and ADC fifo */
  43     IISFIFO_CFG |= IIS_RXCLR | IIS_TXCLR;
  44 }
  45 #else /* PP502X */
  46
  47 /*
  48  * Reset the I2S BIT.FORMAT I2S, 16bit, FIFO.FORMAT 32bit
  49  */
  50 void i2s_reset(void)
  51 {
  52     /* I2S soft reset */
  53     IISCONFIG |= IIS_RESET;
  54     IISCONFIG &= ~IIS_RESET;
  55
  56     /* BIT.FORMAT */
  57     IISCONFIG = ((IISCONFIG & ~IIS_FORMAT_MASK) | IIS_FORMAT_IIS);
  58     /* BIT.SIZE */
  59     IISCONFIG = ((IISCONFIG & ~IIS_SIZE_MASK) | IIS_SIZE_16BIT);
  60
  61     /* FIFO.FORMAT */
  62     /* If BIT.SIZE < FIFO.FORMAT low bits will be 0 */
  63 #ifdef HAVE_AS3514
  64     /* AS3514 can only operate as I2S Slave */
  65     IISCONFIG |= IIS_MASTER;
  66
  67     /* Set I2S to 44.1kHz */
  68 #ifdef PHILIPS_SA9200
  69     /* values taken from the SA9200 OF */
  70     IISCLK = (IISCLK & ~0x1ff) | 31;
  71     IISDIV = (IISDIV & ~0xc0000000) | (2 << 30);
  72     IISDIV = (IISDIV & ~0x3f) | 16;
  73 #else
  74     IISCLK = (IISCLK & ~0x1ff) | 33;
  75     IISDIV = 7;
  76 #endif
  77 #endif /* HAVE_AS3514 */
  78
  79     IISCONFIG = ((IISCONFIG & ~IIS_FIFO_FORMAT_MASK) | IIS_FIFO_FORMAT_LE16_2);
  80
  81     /* RX_ATN_LVL = when 12 slots full */
  82     /* TX_ATN_LVL = DMA request when 4 slots empty */
  83     IISFIFO_CFG |= IIS_RX_FULL_LVL_12 | IIS_TX_EMPTY_LVL_4;
  84
  85     /* Rx.CLR = 1, TX.CLR = 1 */
  86     IISFIFO_CFG |= IIS_RXCLR | IIS_TXCLR;
  87 }
  88
  89 #endif /* CONFIG_CPU == */