openwrt-xburst/target/linux/adm5120/files/include/asm-mips/mach-adm5120/adm5120_uart.h

/*
 *  ADM5120 UART definitions
 *
 *  This header file defines the hardware registers of the ADM5120 SoC
 *  built-in UARTs.
 *
 *  Copyright (C) 2007 OpenWrt.org
 *  Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License version 2 as published
 *  by the Free Software Foundation.
 *
 */

#ifndef _ADM5120_UART_H_
#define _ADM5120_UART_H_

#define UART_BAUDDIV(clk, baud) ((clk/(16 * (baud)))-1)

#define UART_REG_DATA	0x00
#define UART_REG_RSR	0x04
#define UART_REG_ECR	UART_REG_RSR
#define UART_REG_LCRH	0x08
#define UART_REG_LCRM	0x0C
#define UART_REG_LCRL	0x10
#define UART_REG_CTRL	0x14
#define UART_REG_FLAG	0x18

/* Receive Status Register bits */
#define UART_RSR_FE	( 1 << 0 )
#define UART_RSR_PE	( 1 << 1 )
#define UART_RSR_BE	( 1 << 2 )
#define UART_RSR_OE	( 1 << 3 )
#define UART_RSR_ERR	( UART_RSR_FE | UART_RSR_PE | UART_RSR_BE )

#define UART_ECR_ALL	0xFF

/* Line Control High register bits */
#define UART_LCRH_BRK	( 1 << 0 ) /* send break */
#define UART_LCRH_PEN	( 1 << 1 ) /* parity enable */
#define UART_LCRH_EPS	( 1 << 2 ) /* even parity select */
#define UART_LCRH_STP1	( 0 << 3 ) /* one stop bits select */
#define UART_LCRH_STP2	( 1 << 3 ) /* two stop bits select */
#define UART_LCRH_FEN	( 1 << 4 ) /* FIFO enable */

#define UART_LCRH_WLEN5	( 0 << 5 )
#define UART_LCRH_WLEN6	( 1 << 5 )
#define UART_LCRH_WLEN7	( 2 << 5 )
#define UART_LCRH_WLEN8	( 3 << 5 )

/* Control register bits */
#define UART_CTRL_EN	( 1 << 0 )

/* Flag register bits */
#define UART_FLAG_CTS	( 1 << 0 )
#define UART_FLAG_DSR	( 1 << 1 )
#define UART_FLAG_DCD	( 1 << 2 )
#define UART_FLAG_BUSY	( 1 << 3 )
#define UART_FLAG_RXFE	( 1 << 4 )
#define UART_FLAG_TXFF	( 1 << 5 )
#define UART_FLAG_RXFF	( 1 << 6 )
#define UART_FLAG_TXFE	( 1 << 7 )

#endif /* _ADM5120_UART_H_ */