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 unsigned int use_pio :1; 69 unsigned int fast_mode :1; 70 unsigned int high_mode:1; 71 unsigned char master_code; 72 unsigned long rate; 73 }; 74 #endif 75