include/asm-arm/arch-at91/at91_twi.h

   1 /*
   2  * include/asm-arm/arch-at91/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_SWRST          (1 <<  7)       /* Software Reset */
  25
  26 #define AT91_TWI_MMR            0x04            /* Master Mode Register */
  27 #define         AT91_TWI_IADRSZ         (3    <<  8)    /* Internal Device Address Size */
  28 #define                 AT91_TWI_IADRSZ_NO              (0 << 8)
  29 #define                 AT91_TWI_IADRSZ_1               (1 << 8)
  30 #define                 AT91_TWI_IADRSZ_2               (2 << 8)
  31 #define                 AT91_TWI_IADRSZ_3               (3 << 8)
  32 #define         AT91_TWI_MREAD          (1    << 12)    /* Master Read Direction */
  33 #define         AT91_TWI_DADR           (0x7f << 16)    /* Device Address */
  34
  35 #define AT91_TWI_IADR           0x0c            /* Internal Address Register */
  36
  37 #define AT91_TWI_CWGR           0x10            /* Clock Waveform Generator Register */
  38 #define         AT91_TWI_CLDIV          (0xff <<  0)    /* Clock Low Divisor */
  39 #define         AT91_TWI_CHDIV          (0xff <<  8)    /* Clock High Divisor */
  40 #define         AT91_TWI_CKDIV          (7    << 16)    /* Clock Divider */
  41
  42 #define AT91_TWI_SR             0x20            /* Status Register */
  43 #define         AT91_TWI_TXCOMP         (1 <<  0)       /* Transmission Complete */
  44 #define         AT91_TWI_RXRDY          (1 <<  1)       /* Receive Holding Register Ready */
  45 #define         AT91_TWI_TXRDY          (1 <<  2)       /* Transmit Holding Register Ready */
  46 #define         AT91_TWI_OVRE           (1 <<  6)       /* Overrun Error [AT91RM9200 only] */
  47 #define         AT91_TWI_UNRE           (1 <<  7)       /* Underrun Error [AT91RM9200 only] */
  48 #define         AT91_TWI_NACK           (1 <<  8)       /* Not Acknowledged */
  49
  50 #define AT91_TWI_IER            0x24            /* Interrupt Enable Register */
  51 #define AT91_TWI_IDR            0x28            /* Interrupt Disable Register */
  52 #define AT91_TWI_IMR            0x2c            /* Interrupt Mask Register */
  53 #define AT91_TWI_RHR            0x30            /* Receive Holding Register */
  54 #define AT91_TWI_THR            0x34            /* Transmit Holding Register */
  55
  56 #endif
  57