1/* 2 * arch/arm/mach-at91/include/mach/at91_twi.h 3 * 4 * Copyright (C) 2005 Ivan Kokshaysky 5 * Copyright (C) SAN People 6 * 7 * Two-wire Interface (TWI) registers. 8 * Based on AT91RM9200 datasheet revision E. 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 */ 15 16#ifndef AT91_TWI_H 17#define AT91_TWI_H 18 19#define AT91_TWI_CR 0x00 /* Control Register */ 20#define AT91_TWI_START (1 << 0) /* Send a Start Condition */ 21#define AT91_TWI_STOP (1 << 1) /* Send a Stop Condition */ 22#define AT91_TWI_MSEN (1 << 2) /* Master Transfer Enable */ 23#define AT91_TWI_MSDIS (1 << 3) /* Master Transfer Disable */ 24#define AT91_TWI_SVEN (1 << 4) /* Slave Transfer Enable [SAM9260 only] */ 25#define AT91_TWI_SVDIS (1 << 5) /* Slave Transfer Disable [SAM9260 only] */ 26#define AT91_TWI_SWRST (1 << 7) /* Software Reset */ 27 28#define AT91_TWI_MMR 0x04 /* Master Mode Register */ 29#define AT91_TWI_IADRSZ (3 << 8) /* Internal Device Address Size */ 30#define AT91_TWI_IADRSZ_NO (0 << 8) 31#define AT91_TWI_IADRSZ_1 (1 << 8) 32#define AT91_TWI_IADRSZ_2 (2 << 8) 33#define AT91_TWI_IADRSZ_3 (3 << 8) 34#define AT91_TWI_MREAD (1 << 12) /* Master Read Direction */ 35#define AT91_TWI_DADR (0x7f << 16) /* Device Address */ 36 37#define AT91_TWI_SMR 0x08 /* Slave Mode Register [SAM9260 only] */ 38#define AT91_TWI_SADR (0x7f << 16) /* Slave Address */ 39 40#define AT91_TWI_IADR 0x0c /* Internal Address Register */ 41 42#define AT91_TWI_CWGR 0x10 /* Clock Waveform Generator Register */ 43#define AT91_TWI_CLDIV (0xff << 0) /* Clock Low Divisor */ 44#define AT91_TWI_CHDIV (0xff << 8) /* Clock High Divisor */ 45#define AT91_TWI_CKDIV (7 << 16) /* Clock Divider */ 46 47#define AT91_TWI_SR 0x20 /* Status Register */ 48#define AT91_TWI_TXCOMP (1 << 0) /* Transmission Complete */ 49#define AT91_TWI_RXRDY (1 << 1) /* Receive Holding Register Ready */ 50#define AT91_TWI_TXRDY (1 << 2) /* Transmit Holding Register Ready */ 51#define AT91_TWI_SVREAD (1 << 3) /* Slave Read [SAM9260 only] */ 52#define AT91_TWI_SVACC (1 << 4) /* Slave Access [SAM9260 only] */ 53#define AT91_TWI_GACC (1 << 5) /* General Call Access [SAM9260 only] */ 54#define AT91_TWI_OVRE (1 << 6) /* Overrun Error [AT91RM9200 only] */ 55#define AT91_TWI_UNRE (1 << 7) /* Underrun Error [AT91RM9200 only] */ 56#define AT91_TWI_NACK (1 << 8) /* Not Acknowledged */ 57#define AT91_TWI_ARBLST (1 << 9) /* Arbitration Lost [SAM9260 only] */ 58#define AT91_TWI_SCLWS (1 << 10) /* Clock Wait State [SAM9260 only] */ 59#define AT91_TWI_EOSACC (1 << 11) /* End of Slave Address [SAM9260 only] */ 60 61#define AT91_TWI_IER 0x24 /* Interrupt Enable Register */ 62#define AT91_TWI_IDR 0x28 /* Interrupt Disable Register */ 63#define AT91_TWI_IMR 0x2c /* Interrupt Mask Register */ 64#define AT91_TWI_RHR 0x30 /* Receive Holding Register */ 65#define AT91_TWI_THR 0x34 /* Transmit Holding Register */ 66 67#endif 68