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/*
* 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
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