www.pudn.com > s3c2410_i2c.rar > i2c-pxa.h

/*
 *  i2c_pxa.h
 *
 *  Copyright (C) 2002 Intrinsyc Software Inc.
 * 
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 */
#ifndef _I2C_PXA_H_
#define _I2C_PXA_H_

struct i2c_algo_pxa_data
{
        void (*write_byte) (u8 value);
        u8   (*read_byte) (void);
        void (*start) (void);
        void (*repeat_start) (void);
        void (*stop) (void);
        void (*abort) (void);
        int  (*wait_bus_not_busy) (void);
        int  (*wait_for_interrupt) (int wait_type);
        void (*transfer) (int lastbyte, int receive, int midbyte);
        void (*reset) (void);

	int udelay;
	int timeout;
};

#define DEF_TIMEOUT             3
#define BUS_ERROR               (-EREMOTEIO)
#define ACK_DELAY               0       /* time to delay before checking bus error */
#define MAX_MESSAGES            65536   /* maximum number of messages to send */

#define I2C_SLEEP_TIMEOUT       2       /* time to sleep for on i2c transactions */
#define I2C_RETRY               (-2000) /* an error has occurred retry transmit */
#define I2C_TRANSMIT		1
#define I2C_RECEIVE		0
#define I2C_PXA_SLAVE_ADDR      0x1    /* slave pxa unit address */
#define I2C_ICR_INIT            (ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD | ICR_SCLE) /* ICR initialization value */
/* ICR initialize bit values 
*                       
*  15. FM       0 (100 Khz operation)
*  14. UR       0 (No unit reset)
*  13. SADIE    0 (Disables the unit from interrupting on slave addresses 
*                                       matching its slave address)
*  12. ALDIE    0 (Disables the unit from interrupt when it loses arbitration 
*                                       in master mode)
*  11. SSDIE    0 (Disables interrupts from a slave stop detected, in slave mode)  
*  10. BEIE     1 (Enable interrupts from detected bus errors, no ACK sent)
*  9.  IRFIE    1 (Enable interrupts from full buffer received)
*  8.  ITEIE    1 (Enables the I2C unit to interrupt when transmit buffer empty)
*  7.  GCD      1 (Disables i2c unit response to general call messages as a slave) 
*  6.  IUE      0 (Disable unit until we change settings)
*  5.  SCLE     1 (Enables the i2c clock output for master mode (drives SCL)   
*  4.  MA       0 (Only send stop with the ICR stop bit)
*  3.  TB       0 (We are not transmitting a byte initially)
*  2.  ACKNAK   0 (Send an ACK after the unit receives a byte)
*  1.  STOP     0 (Do not send a STOP)
*  0.  START    0 (Do not send a START)
*
*/

#define I2C_ISR_INIT            0x7FF  /* status register init */
/* I2C status register init values 
 *
 * 10. BED      1 (Clear bus error detected)
 * 9.  SAD      1 (Clear slave address detected)
 * 7.  IRF      1 (Clear IDBR Receive Full)
 * 6.  ITE      1 (Clear IDBR Transmit Empty)
 * 5.  ALD      1 (Clear Arbitration Loss Detected)
 * 4.  SSD      1 (Clear Slave Stop Detected)
 */

#endif