firmware/export/i2c-pp.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * PP502X and PP5002 I2C driver
  11  *
  12  * Based on code from the ipodlinux project - http://ipodlinux.org/
  13  * Adapted for Rockbox in November 2005
  14  *
  15  * Original file: linux/arch/armnommu/mach-ipod/hardware.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 /*
  28  * PortalPlayer i2c driver
  29  *
  30  */
  31
  32 #ifndef _I2C_PP_H
  33 #define _I2C_PP_H
  34
  35 #define I2C_CTRL    (*(volatile unsigned char*)(I2C_BASE+0x00))
  36 #define I2C_ADDR    (*(volatile unsigned char*)(I2C_BASE+0x04))
  37 #define I2C_DATA(X) (*(volatile unsigned char*)(I2C_BASE+0xc+(4*X)))
  38 #define I2C_STATUS  (*(volatile unsigned char*)(I2C_BASE+0x1c))
  39
  40 /* I2C_CTRL bit definitions */
  41 #define I2C_SEND    0x80
  42
  43 /* I2C_STATUS bit definitions */
  44 #define I2C_BUSY    (1<<6)
  45
  46 /* TODO: Fully implement i2c driver */
  47
  48 /* To be used by drivers that need to do multiple i2c operations
  49    atomically */
  50 void i2c_lock(void);
  51 void i2c_unlock(void);
  52
  53 void i2c_init(void);
  54 int i2c_readbyte(unsigned int dev_addr, int addr);
  55 int pp_i2c_send(unsigned int addr, int data0, int data1);
  56 int i2c_readbytes(unsigned int dev_addr, int addr, int len, unsigned char *data);
  57
  58 #endif