/*
 *   Zilog Z8530 SCC Chip
 *
 *	Copyright 1981 UniSoft Corporation
 */

/* read register 0 bits */
#define R0RXRDY	0x01		/* receiver is ready */
#define R0ZERO	0x02		/* zero count */
#define R0TXRDY	0x04		/* transmitter is ready */
#define R0DCD	0x08		/* data carrier detect */
#define R0SYNC	0x10		/* sync */
#define R0CTS	0x20		/* clear to send */
#define R0UNDERRUN 0x40		/* transmitter underrun */
#define R0BREAK	0x80		/* break */

/* read register 1 bits */
#define R1ALLSENT	0x01	/* Async mode: all data cleared transmitter */
#define R1RESIDUE	0x0E	/* residue bits (see tables) */
#define R1PARERR	0x10	/* parity error */
#define R1OVRERR	0x20	/* lost characters due to overrun */
#define R1FRMERR	0x40	/* CRC or framing error */
#define R1ENDFRAME	0x80	/* SDLC: end of frame */

/* write register 0 - command register */
#define W0NULL		0x00	/* null code */
#define	W0POINTHIGH	0x08	/* select second bank of registers */
#define W0REXT		0x10	/* reset external/status interrupt */
#define W0ABORT		0x18	/* send abort */
#define W0RXINT		0x20	/* enable interrupt on next Rx char */
#define W0RTXPND	0x28	/* reset transmitter interrupt pending */
#define W0RERROR	0x30	/* error reset */
#define W0RIUS		0x38	/* reset highest interrupt under service */
#define W0RXCRC		0x40	/* reset Rx crc checker */
#define W0TXCRC		0x80	/* reset Tx crc generator */
#define W0TXURUN	0xC0	/* reset Tx underrun/eom latch */

/* write register 1 - xmit/rcv interrupt and data xfer mode */
#define W1EXTIEN	0x01	/* external interrupt enable */
#define W1TXIEN		0x02	/* transmitter interrupt enable */
#define W1PSC		0x04	/* parity is a special condition */
#define W1RXDI		0x00	/* Rx int disable */
#define W1RXIFIRST	0x08	/* Rx interrupt on first char or special */
#define W1RXIALL	0x10	/* Rx interrupt on all chars or special */
#define W1RXISC		0x18	/* Rx interrupt on special condition only */
#define W1WDMARCV	0x20	/* wait/dma request on receive/transmit */
#define W1WDMARF	0x40	/* wait/dma request function */
#define W1WDMARE	0x80	/* wait/dma request enable */

/* write register 2 - interrupt vector */

/* write register 3 - receive parameters and control */
#define W3RXENABLE	0x01	/* Rx enable */
#define W3SCLI		0x02	/* sync character load inhibit */
#define W3ASM		0x04	/* address search mode (sdlc) */
#define W3RXCRC		0x08	/* Rx crc enable */
#define W3EHUNT		0x10	/* enter hunt mode */
#define W3AUTOENABLES	0x20	/* auto enables */
#define W35BIT		0x00	/* 5 bit data */
#define W36BIT		0x80	/* 6 bit data */
#define W37BIT		0x40	/* 7 bit data */
#define W38BIT		0xC0	/* 8 bit data */

/* write register 4 - xmit/rcv misc parameters and modes */
#define W4PARENABLE	0x01	/* parity enable */
#define W4PAREVEN	0x02	/* even parity */
#define W4ENSYNC	0x00	/* enable sync modes */
#define W41STOP		0x04	/* 1 stop bit */
#define W415STOP	0x08	/* 1.5 stop bits */
#define W42STOP		0x0C	/* 2 stop bits */
#define W48SYNC		0x00	/* 8 bit sync character */
#define W416SYNC	0x10	/* 16 bit sync character */
#define W4SDLC		0x20	/* sdlc mode (01111110 flag) */
#define W4EXTSYNC	0x30	/* external sync mode */
#define W4CLK1		0x00	/* X 1 clock mode */
#define W4CLK16		0x40	/* X 16 clock mode */
#define W4CLK32		0x80	/* X 32 clock mode */
#define W4CLK64		0xC0	/* X 64 clock mode */

/* write register 5 - transmit parameter and control */
#define W5TXCRC		0x01	/* Tx crc enable */
#define W5RTS		0x02	/* rts */
#define W5CRC16		0x04	/* crc-16/sdlc */
#define W5TXENABLE	0x08	/* transmitter enable */
#define W5BREAK		0x10	/* send break */
#define W55BIT		0x00	/* 5 or less bit data */
#define W56BIT		0x40	/* 6 bit data */
#define W57BIT		0x20	/* 7 bit data */
#define W58BIT		0x60	/* 8 bit data */
#define W5DTR		0x80	/* data terminal ready */

/* write register 6 - sync chars or sdlc address field */

/* write register 7 - sync chars or sdlc address flag */

/* write register 8 - transmit buffer */

/* write register 9 - master interrupt control */
#define W9VIS		0x01	/* vector includes status */
#define W9NV		0x02	/* no vector */
#define W9DLC		0x04	/* disable lower chain */
#define W9MIE		0x08	/* master interrupt enable */
#define W9HIGHSTATUS	0x10	/* status high/low */
#define W9BRESET	0x40	/* channel b reset */
#define W9ARESET	0x80	/* channel a reset */
#define W9HRESET	0xC0	/* force hardware reset */

/* write register 10 - misc transmitter/receiver control bits */
#define W106BITSYNC	0x01	/* 6 bit/8 bit sync */
#define W10LOOP		0x02	/* loop mode */
#define W10AUR		0x04	/* abort/flag on underrun */
#define W10MARK		0x08	/* mark/flag idle */
#define W10APOLL	0x10	/* go active on poll */
#define W10NRZ		0x00	/* nrz */
#define W10NRZI		0x20	/* nrzi */
#define W10FM1		0x40	/* fm1 */
#define W10FM0		0x60	/* fm0 */
#define W10CRCPRESET	0x80	/* crc preset 1/0 */

/* write register 11 - clock control mode */
#define W11OXTAL	0x00	/* crystal output */
#define W11OXCLK	0x01	/* transmit clock */
#define W11OBR		0x02	/* baud rate generator output */
#define W11ODPLL	0x03	/* dpll output */
#define W11TRxC		0x04	/* TRxC 0/1 */
#define W11TRTxC	0x00	/* transmit clock RTxC pin */
#define W11TTRxC	0x08	/* transmit clock TRxC pin */
#define W11TBR		0x10	/* transmit clock baud rate generator */
#define W11TDPLL	0x18	/* transmit clock dpll output */
#define W11RRTxC	0x00	/* receive clock RTxC pin */
#define W11RTRxC	0x20	/* receive clock TRxC pin */
#define W11RBR		0x40	/* receive clock baud rate generator */
#define W11RDPLL	0x60	/* receive clock dpll output */
#define W11XTAL		0x80	/* crystal */

/* write register 12 - lower byte of baud rate generator */

/* write register 13 - upper byte of baud rate generator */

/* write register 14 - misc control bits */
#define W14BRGE		0x01	/* baud rate generator enable */
#define W14BRINT	0x02	/* baud rate generator internal */
#define W14DTRREQ	0x04	/* dtr/req function */
#define W14AUTOECHO	0x08	/* auto echo */
#define W14LOCALLB	0x10	/* local loop back */
#define W14NULL		0x00	/* null command */
#define W14ESM		0x20	/* enter search mode */
#define W14RMC		0x40	/* reset missing clock */
#define W14DDPLL	0x60	/* disable dpll */
#define W14SBRGEN	0x80	/* set source baud rate generator */
#define W14SRTxC	0xA0	/* set source RTxC */
#define W14SFM		0xC0	/* set fm mode */
#define W14SNRZI	0xE0	/* set nrzi mode */

struct device {
	char	dum1;
	char	csr;
	char	dum2[3];
	char	data;
};

/* structure for storage of port reset code and baud generator speed
 */
struct scline {
	char reset;
	long speed;
};