release/src-rt-6.x/linux/linux-2.6/include/asm-arm/arch-pxa/i2c.h

   1 /*
   2  *  i2c_pxa.h
   3  *
   4  *  Copyright (C) 2002 Intrinsyc Software Inc.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License version 2 as
   8  *  published by the Free Software Foundation.
   9  *
  10  */
  11 #ifndef _I2C_PXA_H_
  12 #define _I2C_PXA_H_
  13
  14 #if 0
  15 #define DEF_TIMEOUT             3
  16 #else
  17 /* need a longer timeout if we're dealing with the fact we may well be
  18  * looking at a multi-master environment
  19 */
  20 #define DEF_TIMEOUT             32
  21 #endif
  22
  23 #define BUS_ERROR               (-EREMOTEIO)
  24 #define XFER_NAKED              (-ECONNREFUSED)
  25 #define I2C_RETRY               (-2000) /* an error has occurred retry transmit */
  26
  27 /* ICR initialize bit values
  28 *
  29 *  15. FM       0 (100 Khz operation)
  30 *  14. UR       0 (No unit reset)
  31 *  13. SADIE    0 (Disables the unit from interrupting on slave addresses
  32 *                                       matching its slave address)
  33 *  12. ALDIE    0 (Disables the unit from interrupt when it loses arbitration
  34 *                                       in master mode)
  35 *  11. SSDIE    0 (Disables interrupts from a slave stop detected, in slave mode)
  36 *  10. BEIE     1 (Enable interrupts from detected bus errors, no ACK sent)
  37 *  9.  IRFIE    1 (Enable interrupts from full buffer received)
  38 *  8.  ITEIE    1 (Enables the I2C unit to interrupt when transmit buffer empty)
  39 *  7.  GCD      1 (Disables i2c unit response to general call messages as a slave)
  40 *  6.  IUE      0 (Disable unit until we change settings)
  41 *  5.  SCLE     1 (Enables the i2c clock output for master mode (drives SCL)
  42 *  4.  MA       0 (Only send stop with the ICR stop bit)
  43 *  3.  TB       0 (We are not transmitting a byte initially)
  44 *  2.  ACKNAK   0 (Send an ACK after the unit receives a byte)
  45 *  1.  STOP     0 (Do not send a STOP)
  46 *  0.  START    0 (Do not send a START)
  47 *
  48 */
  49 #define I2C_ICR_INIT    (ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD | ICR_SCLE)
  50
  51 /* I2C status register init values
  52  *
  53  * 10. BED      1 (Clear bus error detected)
  54  * 9.  SAD      1 (Clear slave address detected)
  55  * 7.  IRF      1 (Clear IDBR Receive Full)
  56  * 6.  ITE      1 (Clear IDBR Transmit Empty)
  57  * 5.  ALD      1 (Clear Arbitration Loss Detected)
  58  * 4.  SSD      1 (Clear Slave Stop Detected)
  59  */
  60 #define I2C_ISR_INIT    0x7FF  /* status register init */
  61
  62 struct i2c_slave_client;
  63
  64 struct i2c_pxa_platform_data {
  65         unsigned int            slave_addr;
  66         struct i2c_slave_client *slave;
  67         unsigned int            class;
  68 };
  69
  70 extern void pxa_set_i2c_info(struct i2c_pxa_platform_data *info);
  71 #endif