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Miscellany
Saturday, December 9th, 2006 at 11:13:51am MST 

  1. /***************************************************************************
  2.  *             __________               __   ___.
  3.  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
  4.  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
  5.  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
  6.  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
  7.  *                     \/            \/     \/    \/            \/
  8.  * $Id: wmcodec-pp.c,v 1.2 2006-10-27 11:24:23 bagder Exp $
  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.  * All files in this archive are subject to the GNU General Public License.
  20.  * See the file COPYING in the source tree root for full license agreement.
  21.  *
  22.  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  23.  * KIND, either express or implied.
  24.  *
  25.  ****************************************************************************/
  26.  
  27. #include "system.h"
  28.  
  29. /* TODO: Add in PP5002 defs */
  30. #if CONFIG_CPU == PP5002
  31. void i2s_reset(void)
  32. {
  33.     /* I2S device reset */
  34.     DEV_RS |= 0x80;
  35.     DEV_RS &= ~0x80;
  36.  
  37.     /* I2S controller enable */
  38.     IISCONFIG |= 1;
  39.  
  40.     /* BIT.FORMAT [11:10] = I2S (default) */
  41.     /* BIT.SIZE [9:8] = 24bit */
  42.     /* FIFO.FORMAT = 24 bit LSB */
  43.  
  44.     /* reset DAC and ADC fifo */
  45.     IISFIFO_CFG |= 0x30000;
  46. }
  47. #else /* PP502X */
  48.  
  49. /* Data format on the I2S bus */
  50. #define FORMAT_MASK (0x3 << 10)
  51. #define FORMAT_I2S  (0x00 << 10)
  52. /* Other formats not yet known */
  53.  
  54. /* Data size on I2S bus */
  55. #define SIZE_MASK   (0x3 << 8)
  56. #define SIZE_16BIT  (0x00 << 10)
  57. /* Other sizes not yet known */
  58.  
  59. /* Data size/format on I2S FIFO */
  60. #define FIFO_FORMAT_MASK (0x7 << 4)
  61. #define FIFO_FORMAT_32LSB (0x011 << 4)
  62. /* Other formats not yet known */
  63.  
  64. /* Are we I2S Master or slave? */
  65. #define I2S_MASTER (0x25)
  66.  
  67. #define I2S_RESET (0x1 << 31)
  68.  
  69. /*
  70.  * Reset the I2S BIT.FORMAT I2S, 16bit, FIFO.FORMAT 32bit
  71.  */
  72. void i2s_reset(void)
  73. {
  74.     /* I2S soft reset */
  75.     IISCONFIG |= I2S_RESET;
  76.     IISCONFIG &= ~I2S_RESET;
  77.  
  78.     /* BIT.FORMAT */
  79.     IISCONFIG = ((IISCONFIG & ~FORMAT_MASK) | FORMAT_I2S);
  80.  
  81.     /* BIT.SIZE */
  82.     IISCONFIG = ((IISCONFIG & ~SIZE_MASK) | SIZE_16BIT);
  83.  
  84.     /* FIFO.FORMAT */
  85.     /* If BIT.SIZE < FIFO.FORMAT low bits will be 0 */
  86.     IISCONFIG = ((IISCONFIG & ~FIFO_FORMAT_MASK) | FIFO_FORMAT_32LSB);
  87.  
  88.     /* RX_ATN_LVL=1 == when 12 slots full */
  89.     /* TX_ATN_LVL=1 == when 12 slots empty */
  90.     IISFIFO_CFG |= 0x33;
  91.  
  92.     /* Rx.CLR = 1, TX.CLR = 1 */
  93.     IISFIFO_CFG |= 0x1100;
  94. }
  95. #endif

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