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/* 16450.h -- Definition of types and structures for 8250/16450 serial UART
   Copyright (C) 2000 Damjan Lampret, lampret@opencores.org
 
This file is part of OpenRISC 1000 Architectural Simulator.
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
 
/* Prototypes */
void uart_write(unsigned long addr, unsigned long value);
unsigned long uart_read(unsigned long addr);
void uart_reset();
void uart_clock();
 
/* Registers */
 
struct dev_16450 {
	struct {
		unsigned char txbuf;
		unsigned char rxbuf;
		unsigned char dll;
		unsigned char dlh;
		unsigned char ier;
		unsigned char iir;
		unsigned char lcr;
		unsigned char mcr;
		unsigned char lsr;
		unsigned char msr;
		unsigned char scr;
	} regs;		/* Visible registers */
	struct {
		unsigned char txser;
		unsigned char rxser;
		unsigned char loopback;
	} iregs;	/* Internal registers */
	struct {
		unsigned char txser;
		unsigned char rxser;
		unsigned char txbuf;
		unsigned char rxbuf;
		unsigned char thre_int;
		unsigned long txser_clks;
		unsigned long rxser_clks;
	} istat;	/* Internal status */
	unsigned long char_clks;
	FILE * rxfs;
	FILE * txfs;
	unsigned long baseaddr;
};
 
/* Definitions */
#define FULL		1
#define EMPTY		0
#define UART_ADDR_SPACE 8	/* UART memory address space size in bytes */
 
/*
 * Addresses of visible registers
 *
 */
#define UART_RXBUF	0	/* R: Rx buffer, DLAB=0 */
#define UART_TXBUF	0	/* W: Tx buffer, DLAB=0 */
#define UART_DLL	0	/* R/W: Divisor Latch Low, DLAB=1 */
#define UART_DLH	1	/* R/W: Divisor Latch High, DLAB=1 */
#define UART_IER	1	/* R/W: Interrupt Enable Register */
#define UART_IIR	2	/* R: Interrupt ID Register */
#define UART_LCR	3	/* R/W: Line Control Register */
#define UART_MCR	4	/* R/W: Modem Control Register */
#define UART_LSR	5	/* R: Line Status Register */
#define UART_MSR	6	/* R: Modem Status Register */
#define UART_SCR	7	/* R/W: Scratch Register */
 
/*
 * R/W masks for valid bits in 8250/16450 (mask out 16550 and later bits)
 *
 */
#define UART_VALID_LCR	0xff
#define UART_VALID_LSR	0x7f
#define UART_VALID_IIR	0x07
#define UART_VALID_IER	0x0f
#define UART_VALID_MCR	0x1f
#define UART_VALID_MSR	0xff
 
/*
 * Bit definitions for the Line Control Register
 * 
 */
#define UART_LCR_DLAB	0x80	/* Divisor latch access bit */
#define UART_LCR_SBC	0x40	/* Set break control */
#define UART_LCR_SPAR	0x20	/* Stick parity (?) */
#define UART_LCR_EPAR	0x10	/* Even parity select */
#define UART_LCR_PARITY	0x08	/* Parity Enable */
#define UART_LCR_STOP	0x04	/* Stop bits: 0=1 stop bit, 1= 2 stop bits */
#define UART_LCR_WLEN5  0x00	/* Wordlength: 5 bits */
#define UART_LCR_WLEN6  0x01	/* Wordlength: 6 bits */
#define UART_LCR_WLEN7  0x02	/* Wordlength: 7 bits */
#define UART_LCR_WLEN8  0x03	/* Wordlength: 8 bits */
 
/*
 * Bit definitions for the Line Status Register
 */
#define UART_LSR_TXSERE	0x40	/* Transmitter serial register empty */
#define UART_LSR_TXBUFE	0x20	/* Transmitter buffer register empty */
#define UART_LSR_BREAK	0x10	/* Break interrupt indicator */
#define UART_LSR_FRAME	0x08	/* Frame error indicator */
#define UART_LSR_PARITY	0x04	/* Parity error indicator */
#define UART_LSR_OVRRUN	0x02	/* Overrun error indicator */
#define UART_LSR_RDRDY	0x01	/* Receiver data ready */
 
/*
 * Bit definitions for the Interrupt Identification Register
 */
#define UART_IIR_NO_INT	0x01	/* No interrupts pending */
#define UART_IIR_ID	0x06	/* Mask for the interrupt ID */
 
#define UART_IIR_MSI	0x00	/* Modem status interrupt (Low priority) */
#define UART_IIR_THRI	0x02	/* Transmitter holding register empty */
#define UART_IIR_RDI	0x04	/* Receiver data interrupt */
#define UART_IIR_RLSI	0x06	/* Receiver line status interrupt (High p.) */
 
/*
 * Bit definitions for the Interrupt Enable Register
 */
#define UART_IER_MSI	0x08	/* Enable Modem status interrupt */
#define UART_IER_RLSI	0x04	/* Enable receiver line status interrupt */
#define UART_IER_THRI	0x02	/* Enable Transmitter holding register int. */
#define UART_IER_RDI	0x01	/* Enable receiver data interrupt */
 
/*
 * Bit definitions for the Modem Control Register
 */
#define UART_MCR_LOOP	0x10	/* Enable loopback mode */
#define UART_MCR_AUX2	0x08	/* Auxilary 2  */
#define UART_MCR_AUX1	0x04	/* Auxilary 1 */
#define UART_MCR_RTS	0x02	/* Force RTS */
#define UART_MCR_DTR	0x01	/* Force DTR */
 
/*
 * Bit definitions for the Modem Status Register
 */
#define UART_MSR_DCD	0x80	/* Data Carrier Detect */
#define UART_MSR_RI	0x40	/* Ring Indicator */
#define UART_MSR_DSR	0x20	/* Data Set Ready */
#define UART_MSR_CTS	0x10	/* Clear to Send */
#define UART_MSR_DDCD	0x08	/* Delta DCD */
#define UART_MSR_TERI	0x04	/* Trailing edge ring indicator */
#define UART_MSR_DDSR	0x02	/* Delta DSR */
#define UART_MSR_DCTS	0x01	/* Delta CTS */