source: rtems/c/src/lib/include/motorola/mc68681.h @ 28a4b1d

/*
 * mc68681-duart.h -- Low level support code for the Motorola mc68681
 *                   DUART. This one is one the mc68ec0x0 board.
 *                   Written by rob@cygnus.com (Rob Savoye)
 *
 *  $Id$
 */

#ifndef __MC68681_H__
#define __MC68681_H__
#define DUART_ADDR      0xb00003                /* base address of the DUART */

/*
 * mc68681 register offsets
 */
#define DUART_MR1A      0x00                    /* Mode Register A */
#define DUART_MR2A      0x00                    /* Mode Register A */
#define DUART_SRA       0x04                    /* Status Register A */
#define DUART_CSRA      0x04                    /* Clock-Select Register A */
#define DUART_CRA       0x08                    /* Command Register A */
#define DUART_RBA       0x0c                    /* Receive Buffer A */
#define DUART_TBA       0x0c                    /* Transmit Buffer A */
#define DUART_IPCR      0x10                    /* Input Port Change Register */
#define DUART_ACR       0x10                    /* Auxiliary Control Register */
#define DUART_ISR       0x14                    /* Interrupt Status Register */
#define DUART_IMR       0x14                    /* Interrupt Mask Register */
#define DUART_CUR       0x18                    /* Counter Mode: current MSB */
#define DUART_CTUR      0x18                    /* Counter/Timer upper reg */
#define DUART_CLR       0x1c                    /* Counter Mode: current LSB */
#define DUART_CTLR      0x1c                    /* Counter/Timer lower reg */
#define DUART_MR1B      0x20                    /* Mode Register B */
#define DUART_MR2B      0x20                    /* Mode Register B */
#define DUART_SRB       0x24                    /* Status Register B */
#define DUART_CSRB      0x24                    /* Clock-Select Register B */
#define DUART_CRB       0x28                    /* Command Register B */
#define DUART_RBB       0x2c                    /* Receive Buffer B */
#define DUART_TBB       0x2c                    /* Transmit Buffer A */
#define DUART_IVR       0x30                    /* Interrupt Vector Register */
#define DUART_IP        0x34                    /* Input Port */
#define DUART_OPCR      0x34                    /* Output Port Configuration Reg. */
#define DUART_STRTCC    0x38                    /* Start-Counter command */
#define DUART_OPRSET    0x38                    /* Output Port Reg, SET bits */
#define DUART_STOPCC    0x3c                    /* Stop-Counter command */
#define DUART_OPRRST    0x3c                    /* Output Port Reg, ReSeT bits */

/* this is just if you want a copy of the chip's registers */
struct duart_regs {
  unsigned char mr1a_reg;                       /* Mode Register A */
  unsigned char mr2a_reg;                       /* Mode Register A */
  unsigned char sra_reg;                        /* Status Register A */
  unsigned char csra_reg;                       /* Clock-Select Register A */
  unsigned char cra_reg;                        /* Command Register A */
  unsigned char ipcr_reg;                       /* Input Port Change Register */
  unsigned char acr_reg;                        /* Auxiliary Control Register */
  unsigned char isr_reg;                        /* Interrupt Status Register */
  unsigned char imr_reg;                        /* Interrupt Mask Register */
  unsigned char cur_reg;                        /* Counter Mode: current MSB */
  unsigned char ctur_reg;                       /* Counter/Timer upper reg */
  unsigned char clr_reg;                        /* Counter Mode: current LSB */
  unsigned char ctlr_reg;                       /* Counter/Timer lower reg */
  unsigned char mr1b_reg;                       /* Mode Register B */
  unsigned char mr2b_reg;                       /* Mode Register B */
  unsigned char srb_reg;                        /* Status Register B */
  unsigned char csrb_reg;                       /* Clock-Select Register B */
  unsigned char crb_reg;                        /* Command Register B */
  unsigned char ivr_reg;                        /* Interrupt Vector Register */
  unsigned char ip_reg;                         /* Input Port */
  unsigned char opcr_reg;                       /* Output Port Configuration Reg. */
  unsigned char oprset_reg;                     /* Output Port Reg; bit SET */
  unsigned char strtcc_reg;                     /* Start-Counter command */
  unsigned char oprrst_reg;                     /* Output Port Reg; bit ReSeT */
  unsigned char stopcc_reg;                     /* Stop-Counter command */
  unsigned char pad;
};

/* Some RTEMS style defines: */
#ifndef VOL8
#define VOL8( ptr )   ((volatile rtems_unsigned8 *)(ptr))
#endif

#define MC68681_WRITE( reg, data ) \
   *(VOL8(DUART_ADDR+reg)) = (data)

#define MC68681_READ( reg, data ) \
   (data) = *(VOL8(DUART_ADDR+reg))

#endif