[deliverable/linux.git] / drivers / tc / zs.h

/*
 * drivers/tc/zs.h: Definitions for the DECstation Z85C30 serial driver.
 *
 * Adapted from drivers/sbus/char/sunserial.h by Paul Mackerras.
 * Adapted from drivers/macintosh/macserial.h by Harald Koerfgen.
 *
 * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 2004  Maciej W. Rozycki
 */
#ifndef _DECSERIAL_H
#define _DECSERIAL_H

#include <asm/dec/serial.h>

#define NUM_ZSREGS    16

struct serial_struct {
	int	type;
	int	line;
	int	port;
	int	irq;
	int	flags;
	int	xmit_fifo_size;
	int	custom_divisor;
	int	baud_base;
	unsigned short	close_delay;
	char	reserved_char[2];
	int	hub6;
	unsigned short	closing_wait; /* time to wait before closing */
	unsigned short	closing_wait2; /* no longer used... */
	int	reserved[4];
};

/*
 * For the close wait times, 0 means wait forever for serial port to
 * flush its output.  65535 means don't wait at all.
 */
#define ZILOG_CLOSING_WAIT_INF	0
#define ZILOG_CLOSING_WAIT_NONE	65535

/*
 * Definitions for ZILOG_struct (and serial_struct) flags field
 */
#define ZILOG_HUP_NOTIFY 0x0001 /* Notify getty on hangups and closes
				   on the callout port */
#define ZILOG_FOURPORT  0x0002	/* Set OU1, OUT2 per AST Fourport settings */
#define ZILOG_SAK	0x0004	/* Secure Attention Key (Orange book) */
#define ZILOG_SPLIT_TERMIOS 0x0008 /* Separate termios for dialin/callout */

#define ZILOG_SPD_MASK	0x0030
#define ZILOG_SPD_HI	0x0010	/* Use 56000 instead of 38400 bps */

#define ZILOG_SPD_VHI	0x0020  /* Use 115200 instead of 38400 bps */
#define ZILOG_SPD_CUST	0x0030  /* Use user-specified divisor */

#define ZILOG_SKIP_TEST	0x0040 /* Skip UART test during autoconfiguration */
#define ZILOG_AUTO_IRQ  0x0080 /* Do automatic IRQ during autoconfiguration */
#define ZILOG_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */
#define ZILOG_PGRP_LOCKOUT    0x0200 /* Lock out cua opens based on pgrp */
#define ZILOG_CALLOUT_NOHUP   0x0400 /* Don't do hangups for cua device */

#define ZILOG_FLAGS	0x0FFF	/* Possible legal ZILOG flags */
#define ZILOG_USR_MASK 0x0430	/* Legal flags that non-privileged
				 * users can set or reset */

/* Internal flags used only by kernel/chr_drv/serial.c */
#define ZILOG_INITIALIZED	0x80000000 /* Serial port was initialized */
#define ZILOG_CALLOUT_ACTIVE	0x40000000 /* Call out device is active */
#define ZILOG_NORMAL_ACTIVE	0x20000000 /* Normal device is active */
#define ZILOG_BOOT_AUTOCONF	0x10000000 /* Autoconfigure port on bootup */
#define ZILOG_CLOSING		0x08000000 /* Serial port is closing */
#define ZILOG_CTS_FLOW		0x04000000 /* Do CTS flow control */
#define ZILOG_CHECK_CD		0x02000000 /* i.e., CLOCAL */

/* Software state per channel */

#ifdef __KERNEL__
/*
 * This is our internal structure for each serial port's state.
 *
 * Many fields are paralleled by the structure used by the serial_struct
 * structure.
 *
 * For definitions of the flags field, see tty.h
 */

struct dec_zschannel {
	volatile unsigned char *control;
	volatile unsigned char *data;

	/* Current write register values */
	unsigned char curregs[NUM_ZSREGS];
};

struct dec_serial {
	struct dec_serial	*zs_next;	/* For IRQ servicing chain.  */
	struct dec_zschannel	*zs_channel;	/* Channel registers.  */
	struct dec_zschannel	*zs_chan_a;	/* A side registers.  */
	unsigned char		read_reg_zero;

	struct dec_serial_hook	*hook;		/* Hook on this channel.  */
	int			tty_break;	/* Set on BREAK condition.  */
	int			is_cons;	/* Is this our console.  */
	int			tx_active;	/* Char is being xmitted.  */
	int			tx_stopped;	/* Output is suspended.  */

	/*
	 * We need to know the current clock divisor
	 * to read the bps rate the chip has currently loaded.
	 */
	int			clk_divisor;	/* May be 1, 16, 32, or 64.  */
	int			zs_baud;

	char			change_needed;

	int			magic;
	int			baud_base;
	int			port;
	int			irq;
	int			flags; 		/* Defined in tty.h.  */
	int			type; 		/* UART type.  */
	struct tty_struct 	*tty;
	int			read_status_mask;
	int			ignore_status_mask;
	int			timeout;
	int			xmit_fifo_size;
	int			custom_divisor;
	int			x_char;		/* XON/XOFF character.  */
	int			close_delay;
	unsigned short		closing_wait;
	unsigned short		closing_wait2;
	unsigned long		event;
	unsigned long		last_active;
	int			line;
	int			count;		/* # of fds on device.  */
	int			blocked_open;	/* # of blocked opens.  */
	unsigned char 		*xmit_buf;
	int			xmit_head;
	int			xmit_tail;
	int			xmit_cnt;
	struct tq_struct	tqueue;
	struct tq_struct	tqueue_hangup;
	wait_queue_head_t	open_wait;
	wait_queue_head_t	close_wait;
};


#define SERIAL_MAGIC 0x5301

/*
 * The size of the serial xmit buffer is 1 page, or 4096 bytes
 */
#define SERIAL_XMIT_SIZE 4096

/*
 * Events are used to schedule things to happen at timer-interrupt
 * time, instead of at rs interrupt time.
 */
#define RS_EVENT_WRITE_WAKEUP	0

#endif /* __KERNEL__ */

/* Conversion routines to/from brg time constants from/to bits
 * per second.
 */
#define BRG_TO_BPS(brg, freq) ((freq) / 2 / ((brg) + 2))
#define BPS_TO_BRG(bps, freq) ((((freq) + (bps)) / (2 * (bps))) - 2)

/* The Zilog register set */

#define	FLAG	0x7e

/* Write Register 0 */
#define	R0	0		/* Register selects */
#define	R1	1
#define	R2	2
#define	R3	3
#define	R4	4
#define	R5	5
#define	R6	6
#define	R7	7
#define	R8	8
#define	R9	9
#define	R10	10
#define	R11	11
#define	R12	12
#define	R13	13
#define	R14	14
#define	R15	15

#define	NULLCODE	0	/* Null Code */
#define	POINT_HIGH	0x8	/* Select upper half of registers */
#define	RES_EXT_INT	0x10	/* Reset Ext. Status Interrupts */
#define	SEND_ABORT	0x18	/* HDLC Abort */
#define	RES_RxINT_FC	0x20	/* Reset RxINT on First Character */
#define	RES_Tx_P	0x28	/* Reset TxINT Pending */
#define	ERR_RES		0x30	/* Error Reset */
#define	RES_H_IUS	0x38	/* Reset highest IUS */

#define	RES_Rx_CRC	0x40	/* Reset Rx CRC Checker */
#define	RES_Tx_CRC	0x80	/* Reset Tx CRC Checker */
#define	RES_EOM_L	0xC0	/* Reset EOM latch */

/* Write Register 1 */

#define	EXT_INT_ENAB	0x1	/* Ext Int Enable */
#define	TxINT_ENAB	0x2	/* Tx Int Enable */
#define	PAR_SPEC	0x4	/* Parity is special condition */

#define	RxINT_DISAB	0	/* Rx Int Disable */
#define	RxINT_FCERR	0x8	/* Rx Int on First Character Only or Error */
#define	RxINT_ALL	0x10	/* Int on all Rx Characters or error */
#define	RxINT_ERR	0x18	/* Int on error only */
#define	RxINT_MASK	0x18

#define	WT_RDY_RT	0x20	/* Wait/Ready on R/T */
#define	WT_FN_RDYFN	0x40	/* Wait/FN/Ready FN */
#define	WT_RDY_ENAB	0x80	/* Wait/Ready Enable */

/* Write Register #2 (Interrupt Vector) */

/* Write Register 3 */

#define	RxENABLE	0x1	/* Rx Enable */
#define	SYNC_L_INH	0x2	/* Sync Character Load Inhibit */
#define	ADD_SM		0x4	/* Address Search Mode (SDLC) */
#define	RxCRC_ENAB	0x8	/* Rx CRC Enable */
#define	ENT_HM		0x10	/* Enter Hunt Mode */
#define	AUTO_ENAB	0x20	/* Auto Enables */
#define	Rx5		0x0	/* Rx 5 Bits/Character */
#define	Rx7		0x40	/* Rx 7 Bits/Character */
#define	Rx6		0x80	/* Rx 6 Bits/Character */
#define	Rx8		0xc0	/* Rx 8 Bits/Character */
#define RxNBITS_MASK	0xc0

/* Write Register 4 */

#define	PAR_ENA		0x1	/* Parity Enable */
#define	PAR_EVEN	0x2	/* Parity Even/Odd* */

#define	SYNC_ENAB	0	/* Sync Modes Enable */
#define	SB1		0x4	/* 1 stop bit/char */
#define	SB15		0x8	/* 1.5 stop bits/char */
#define	SB2		0xc	/* 2 stop bits/char */
#define SB_MASK		0xc

#define	MONSYNC		0	/* 8 Bit Sync character */
#define	BISYNC		0x10	/* 16 bit sync character */
#define	SDLC		0x20	/* SDLC Mode (01111110 Sync Flag) */
#define	EXTSYNC		0x30	/* External Sync Mode */

#define	X1CLK		0x0	/* x1 clock mode */
#define	X16CLK		0x40	/* x16 clock mode */
#define	X32CLK		0x80	/* x32 clock mode */
#define	X64CLK		0xC0	/* x64 clock mode */
#define XCLK_MASK	0xC0

/* Write Register 5 */

#define	TxCRC_ENAB	0x1	/* Tx CRC Enable */
#define	RTS		0x2	/* RTS */
#define	SDLC_CRC	0x4	/* SDLC/CRC-16 */
#define	TxENAB		0x8	/* Tx Enable */
#define	SND_BRK		0x10	/* Send Break */
#define	Tx5		0x0	/* Tx 5 bits (or less)/character */
#define	Tx7		0x20	/* Tx 7 bits/character */
#define	Tx6		0x40	/* Tx 6 bits/character */
#define	Tx8		0x60	/* Tx 8 bits/character */
#define TxNBITS_MASK	0x60
#define	DTR		0x80	/* DTR */

/* Write Register 6 (Sync bits 0-7/SDLC Address Field) */

/* Write Register 7 (Sync bits 8-15/SDLC 01111110) */

/* Write Register 8 (transmit buffer) */

/* Write Register 9 (Master interrupt control) */
#define	VIS	1	/* Vector Includes Status */
#define	NV	2	/* No Vector */
#define	DLC	4	/* Disable Lower Chain */
#define	MIE	8	/* Master Interrupt Enable */
#define	STATHI	0x10	/* Status high */
#define SOFTACK 0x20    /* Software Interrupt Acknowledge */
#define	NORESET	0	/* No reset on write to R9 */
#define	CHRB	0x40	/* Reset channel B */
#define	CHRA	0x80	/* Reset channel A */
#define	FHWRES	0xc0	/* Force hardware reset */

/* Write Register 10 (misc control bits) */
#define	BIT6	1	/* 6 bit/8bit sync */
#define	LOOPMODE 2	/* SDLC Loop mode */
#define	ABUNDER	4	/* Abort/flag on SDLC xmit underrun */
#define	MARKIDLE 8	/* Mark/flag on idle */
#define	GAOP	0x10	/* Go active on poll */
#define	NRZ	0	/* NRZ mode */
#define	NRZI	0x20	/* NRZI mode */
#define	FM1	0x40	/* FM1 (transition = 1) */
#define	FM0	0x60	/* FM0 (transition = 0) */
#define	CRCPS	0x80	/* CRC Preset I/O */

/* Write Register 11 (Clock Mode control) */
#define	TRxCXT	0	/* TRxC = Xtal output */
#define	TRxCTC	1	/* TRxC = Transmit clock */
#define	TRxCBR	2	/* TRxC = BR Generator Output */
#define	TRxCDP	3	/* TRxC = DPLL output */
#define	TRxCOI	4	/* TRxC O/I */
#define	TCRTxCP	0	/* Transmit clock = RTxC pin */
#define	TCTRxCP	8	/* Transmit clock = TRxC pin */
#define	TCBR	0x10	/* Transmit clock = BR Generator output */
#define	TCDPLL	0x18	/* Transmit clock = DPLL output */
#define	RCRTxCP	0	/* Receive clock = RTxC pin */
#define	RCTRxCP	0x20	/* Receive clock = TRxC pin */
#define	RCBR	0x40	/* Receive clock = BR Generator output */
#define	RCDPLL	0x60	/* Receive clock = DPLL output */
#define	RTxCX	0x80	/* RTxC Xtal/No Xtal */

/* Write Register 12 (lower byte of baud rate generator time constant) */

/* Write Register 13 (upper byte of baud rate generator time constant) */

/* Write Register 14 (Misc control bits) */
#define	BRENABL	1	/* Baud rate generator enable */
#define	BRSRC	2	/* Baud rate generator source */
#define	DTRREQ	4	/* DTR/Request function */
#define	AUTOECHO 8	/* Auto Echo */
#define	LOOPBAK	0x10	/* Local loopback */
#define	SEARCH	0x20	/* Enter search mode */
#define	RMC	0x40	/* Reset missing clock */
#define	DISDPLL	0x60	/* Disable DPLL */
#define	SSBR	0x80	/* Set DPLL source = BR generator */
#define	SSRTxC	0xa0	/* Set DPLL source = RTxC */
#define	SFMM	0xc0	/* Set FM mode */
#define	SNRZI	0xe0	/* Set NRZI mode */

/* Write Register 15 (external/status interrupt control) */
#define	ZCIE	2	/* Zero count IE */
#define	DCDIE	8	/* DCD IE */
#define	SYNCIE	0x10	/* Sync/hunt IE */
#define	CTSIE	0x20	/* CTS IE */
#define	TxUIE	0x40	/* Tx Underrun/EOM IE */
#define	BRKIE	0x80	/* Break/Abort IE */


/* Read Register 0 */
#define	Rx_CH_AV	0x1	/* Rx Character Available */
#define	ZCOUNT		0x2	/* Zero count */
#define	Tx_BUF_EMP	0x4	/* Tx Buffer empty */
#define	DCD		0x8	/* DCD */
#define	SYNC_HUNT	0x10	/* Sync/hunt */
#define	CTS		0x20	/* CTS */
#define	TxEOM		0x40	/* Tx underrun */
#define	BRK_ABRT	0x80	/* Break/Abort */

/* Read Register 1 */
#define	ALL_SNT		0x1	/* All sent */
/* Residue Data for 8 Rx bits/char programmed */
#define	RES3		0x8	/* 0/3 */
#define	RES4		0x4	/* 0/4 */
#define	RES5		0xc	/* 0/5 */
#define	RES6		0x2	/* 0/6 */
#define	RES7		0xa	/* 0/7 */
#define	RES8		0x6	/* 0/8 */
#define	RES18		0xe	/* 1/8 */
#define	RES28		0x0	/* 2/8 */
/* Special Rx Condition Interrupts */
#define	PAR_ERR		0x10	/* Parity error */
#define	Rx_OVR		0x20	/* Rx Overrun Error */
#define	FRM_ERR		0x40	/* CRC/Framing Error */
#define	END_FR		0x80	/* End of Frame (SDLC) */

/* Read Register 2 (channel b only) - Interrupt vector */

/* Read Register 3 (interrupt pending register) ch a only */
#define	CHBEXT	0x1		/* Channel B Ext/Stat IP */
#define	CHBTxIP	0x2		/* Channel B Tx IP */
#define	CHBRxIP	0x4		/* Channel B Rx IP */
#define	CHAEXT	0x8		/* Channel A Ext/Stat IP */
#define	CHATxIP	0x10		/* Channel A Tx IP */
#define	CHARxIP	0x20		/* Channel A Rx IP */

/* Read Register 8 (receive data register) */

/* Read Register 10  (misc status bits) */
#define	ONLOOP	2		/* On loop */
#define	LOOPSEND 0x10		/* Loop sending */
#define	CLK2MIS	0x40		/* Two clocks missing */
#define	CLK1MIS	0x80		/* One clock missing */

/* Read Register 12 (lower byte of baud rate generator constant) */

/* Read Register 13 (upper byte of baud rate generator constant) */

/* Read Register 15 (value of WR 15) */

/* Misc macros */
#define ZS_CLEARERR(channel)    (write_zsreg(channel, 0, ERR_RES))
#define ZS_CLEARFIFO(channel)   do { volatile unsigned char garbage; \
				     garbage = read_zsdata(channel); \
				     garbage = read_zsdata(channel); \
				     garbage = read_zsdata(channel); \
				} while(0)

#endif /* !(_DECSERIAL_H) */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* drivers/tc/zs.h: Definitions for the DECstation Z85C30 serial driver.
	3	*
	4	* Adapted from drivers/sbus/char/sunserial.h by Paul Mackerras.
	5	* Adapted from drivers/macintosh/macserial.h by Harald Koerfgen.
	6	*
	7	* Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
	8	* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
	9	* Copyright (C) 2004 Maciej W. Rozycki
	10	*/
	11	#ifndef _DECSERIAL_H
	12	#define _DECSERIAL_H
	13
	14	#include <asm/dec/serial.h>
	15
	16	#define NUM_ZSREGS 16
	17
	18	struct serial_struct {
	19	int type;
	20	int line;
	21	int port;
	22	int irq;
	23	int flags;
	24	int xmit_fifo_size;
	25	int custom_divisor;
	26	int baud_base;
	27	unsigned short close_delay;
	28	char reserved_char[2];
	29	int hub6;
	30	unsigned short closing_wait; /* time to wait before closing */
	31	unsigned short closing_wait2; /* no longer used... */
	32	int reserved[4];
	33	};
	34
	35	/*
	36	* For the close wait times, 0 means wait forever for serial port to
	37	* flush its output. 65535 means don't wait at all.
	38	*/
	39	#define ZILOG_CLOSING_WAIT_INF 0
	40	#define ZILOG_CLOSING_WAIT_NONE 65535
	41
	42	/*
	43	* Definitions for ZILOG_struct (and serial_struct) flags field
	44	*/
	45	#define ZILOG_HUP_NOTIFY 0x0001 /* Notify getty on hangups and closes
	46	on the callout port */
	47	#define ZILOG_FOURPORT 0x0002 /* Set OU1, OUT2 per AST Fourport settings */
	48	#define ZILOG_SAK 0x0004 /* Secure Attention Key (Orange book) */
	49	#define ZILOG_SPLIT_TERMIOS 0x0008 /* Separate termios for dialin/callout */
	50
	51	#define ZILOG_SPD_MASK 0x0030
	52	#define ZILOG_SPD_HI 0x0010 /* Use 56000 instead of 38400 bps */
	53
	54	#define ZILOG_SPD_VHI 0x0020 /* Use 115200 instead of 38400 bps */
	55	#define ZILOG_SPD_CUST 0x0030 /* Use user-specified divisor */
	56
	57	#define ZILOG_SKIP_TEST 0x0040 /* Skip UART test during autoconfiguration */
	58	#define ZILOG_AUTO_IRQ 0x0080 /* Do automatic IRQ during autoconfiguration */
	59	#define ZILOG_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */
	60	#define ZILOG_PGRP_LOCKOUT 0x0200 /* Lock out cua opens based on pgrp */
	61	#define ZILOG_CALLOUT_NOHUP 0x0400 /* Don't do hangups for cua device */
	62
	63	#define ZILOG_FLAGS 0x0FFF /* Possible legal ZILOG flags */
	64	#define ZILOG_USR_MASK 0x0430 /* Legal flags that non-privileged
65	* users can set or reset */
66
67	/* Internal flags used only by kernel/chr_drv/serial.c */
68	#define ZILOG_INITIALIZED 0x80000000 /* Serial port was initialized */
69	#define ZILOG_CALLOUT_ACTIVE 0x40000000 /* Call out device is active */
70	#define ZILOG_NORMAL_ACTIVE 0x20000000 /* Normal device is active */
71	#define ZILOG_BOOT_AUTOCONF 0x10000000 /* Autoconfigure port on bootup */
72	#define ZILOG_CLOSING 0x08000000 /* Serial port is closing */
73	#define ZILOG_CTS_FLOW 0x04000000 /* Do CTS flow control */
74	#define ZILOG_CHECK_CD 0x02000000 /* i.e., CLOCAL */
75
76	/* Software state per channel */
77
78	#ifdef __KERNEL__
79	/*
80	* This is our internal structure for each serial port's state.
81	*
82	* Many fields are paralleled by the structure used by the serial_struct
83	* structure.
84	*
85	* For definitions of the flags field, see tty.h
86	*/
87
88	struct dec_zschannel {
89	volatile unsigned char *control;
90	volatile unsigned char *data;
91
92	/* Current write register values */
93	unsigned char curregs[NUM_ZSREGS];
94	};
95
96	struct dec_serial {
97	struct dec_serial zs_next; / For IRQ servicing chain. */
98	struct dec_zschannel zs_channel; / Channel registers. */
99	struct dec_zschannel zs_chan_a; / A side registers. */
100	unsigned char read_reg_zero;
101
102	struct dec_serial_hook hook; / Hook on this channel. */
103	int tty_break; /* Set on BREAK condition. */
104	int is_cons; /* Is this our console. */
105	int tx_active; /* Char is being xmitted. */
106	int tx_stopped; /* Output is suspended. */
107
108	/*
109	* We need to know the current clock divisor
110	* to read the bps rate the chip has currently loaded.
111	*/
112	int clk_divisor; /* May be 1, 16, 32, or 64. */
113	int zs_baud;
114
115	char change_needed;
116
117	int magic;
118	int baud_base;
119	int port;
120	int irq;
121	int flags; /* Defined in tty.h. */
122	int type; /* UART type. */
123	struct tty_struct *tty;
124	int read_status_mask;
125	int ignore_status_mask;
126	int timeout;
127	int xmit_fifo_size;
128	int custom_divisor;
129	int x_char; /* XON/XOFF character. */
130	int close_delay;
131	unsigned short closing_wait;
132	unsigned short closing_wait2;
133	unsigned long event;
134	unsigned long last_active;
135	int line;
136	int count; /* # of fds on device. */
137	int blocked_open; /* # of blocked opens. */
138	unsigned char *xmit_buf;
139	int xmit_head;
140	int xmit_tail;
141	int xmit_cnt;
142	struct tq_struct tqueue;
143	struct tq_struct tqueue_hangup;
144	wait_queue_head_t open_wait;
145	wait_queue_head_t close_wait;
146	};
147
148
149	#define SERIAL_MAGIC 0x5301
150
151	/*
152	* The size of the serial xmit buffer is 1 page, or 4096 bytes
153	*/
154	#define SERIAL_XMIT_SIZE 4096
155
156	/*
157	* Events are used to schedule things to happen at timer-interrupt
158	* time, instead of at rs interrupt time.
159	*/
160	#define RS_EVENT_WRITE_WAKEUP 0
161
162	#endif /* __KERNEL__ */
163
164	/* Conversion routines to/from brg time constants from/to bits
165	* per second.
166	*/
167	#define BRG_TO_BPS(brg, freq) ((freq) / 2 / ((brg) + 2))
168	#define BPS_TO_BRG(bps, freq) ((((freq) + (bps)) / (2 * (bps))) - 2)
169
170	/* The Zilog register set */
171
172	#define FLAG 0x7e
173
174	/* Write Register 0 */
175	#define R0 0 /* Register selects */
176	#define R1 1
177	#define R2 2
178	#define R3 3
179	#define R4 4
180	#define R5 5
181	#define R6 6
182	#define R7 7
183	#define R8 8
184	#define R9 9
185	#define R10 10
186	#define R11 11
187	#define R12 12
188	#define R13 13
189	#define R14 14
190	#define R15 15
191
192	#define NULLCODE 0 /* Null Code */
193	#define POINT_HIGH 0x8 /* Select upper half of registers */
194	#define RES_EXT_INT 0x10 /* Reset Ext. Status Interrupts */
195	#define SEND_ABORT 0x18 /* HDLC Abort */
196	#define RES_RxINT_FC 0x20 /* Reset RxINT on First Character */
197	#define RES_Tx_P 0x28 /* Reset TxINT Pending */
198	#define ERR_RES 0x30 /* Error Reset */
199	#define RES_H_IUS 0x38 /* Reset highest IUS */
200
201	#define RES_Rx_CRC 0x40 /* Reset Rx CRC Checker */
202	#define RES_Tx_CRC 0x80 /* Reset Tx CRC Checker */
203	#define RES_EOM_L 0xC0 /* Reset EOM latch */
204
205	/* Write Register 1 */
206
207	#define EXT_INT_ENAB 0x1 /* Ext Int Enable */
208	#define TxINT_ENAB 0x2 /* Tx Int Enable */
209	#define PAR_SPEC 0x4 /* Parity is special condition */
210
211	#define RxINT_DISAB 0 /* Rx Int Disable */
212	#define RxINT_FCERR 0x8 /* Rx Int on First Character Only or Error */
213	#define RxINT_ALL 0x10 /* Int on all Rx Characters or error */
214	#define RxINT_ERR 0x18 /* Int on error only */
215	#define RxINT_MASK 0x18
216
217	#define WT_RDY_RT 0x20 /* Wait/Ready on R/T */
218	#define WT_FN_RDYFN 0x40 /* Wait/FN/Ready FN */
219	#define WT_RDY_ENAB 0x80 /* Wait/Ready Enable */
220
221	/* Write Register #2 (Interrupt Vector) */
222
223	/* Write Register 3 */
224
225	#define RxENABLE 0x1 /* Rx Enable */
226	#define SYNC_L_INH 0x2 /* Sync Character Load Inhibit */
227	#define ADD_SM 0x4 /* Address Search Mode (SDLC) */
228	#define RxCRC_ENAB 0x8 /* Rx CRC Enable */
229	#define ENT_HM 0x10 /* Enter Hunt Mode */
230	#define AUTO_ENAB 0x20 /* Auto Enables */
231	#define Rx5 0x0 /* Rx 5 Bits/Character */
232	#define Rx7 0x40 /* Rx 7 Bits/Character */
233	#define Rx6 0x80 /* Rx 6 Bits/Character */
234	#define Rx8 0xc0 /* Rx 8 Bits/Character */
235	#define RxNBITS_MASK 0xc0
236
237	/* Write Register 4 */
238
239	#define PAR_ENA 0x1 /* Parity Enable */
240	#define PAR_EVEN 0x2 /* Parity Even/Odd* */
241
242	#define SYNC_ENAB 0 /* Sync Modes Enable */
243	#define SB1 0x4 /* 1 stop bit/char */
244	#define SB15 0x8 /* 1.5 stop bits/char */
245	#define SB2 0xc /* 2 stop bits/char */
246	#define SB_MASK 0xc
247
248	#define MONSYNC 0 /* 8 Bit Sync character */
249	#define BISYNC 0x10 /* 16 bit sync character */
250	#define SDLC 0x20 /* SDLC Mode (01111110 Sync Flag) */
251	#define EXTSYNC 0x30 /* External Sync Mode */
252
253	#define X1CLK 0x0 /* x1 clock mode */
254	#define X16CLK 0x40 /* x16 clock mode */
255	#define X32CLK 0x80 /* x32 clock mode */
256	#define X64CLK 0xC0 /* x64 clock mode */
257	#define XCLK_MASK 0xC0
258
259	/* Write Register 5 */
260
261	#define TxCRC_ENAB 0x1 /* Tx CRC Enable */
262	#define RTS 0x2 /* RTS */
263	#define SDLC_CRC 0x4 /* SDLC/CRC-16 */
264	#define TxENAB 0x8 /* Tx Enable */
265	#define SND_BRK 0x10 /* Send Break */
266	#define Tx5 0x0 /* Tx 5 bits (or less)/character */
267	#define Tx7 0x20 /* Tx 7 bits/character */
268	#define Tx6 0x40 /* Tx 6 bits/character */
269	#define Tx8 0x60 /* Tx 8 bits/character */
270	#define TxNBITS_MASK 0x60
271	#define DTR 0x80 /* DTR */
272
273	/* Write Register 6 (Sync bits 0-7/SDLC Address Field) */
274
275	/* Write Register 7 (Sync bits 8-15/SDLC 01111110) */
276
277	/* Write Register 8 (transmit buffer) */
278
279	/* Write Register 9 (Master interrupt control) */
280	#define VIS 1 /* Vector Includes Status */
281	#define NV 2 /* No Vector */
282	#define DLC 4 /* Disable Lower Chain */
283	#define MIE 8 /* Master Interrupt Enable */
284	#define STATHI 0x10 /* Status high */
285	#define SOFTACK 0x20 /* Software Interrupt Acknowledge */
286	#define NORESET 0 /* No reset on write to R9 */
287	#define CHRB 0x40 /* Reset channel B */
288	#define CHRA 0x80 /* Reset channel A */
289	#define FHWRES 0xc0 /* Force hardware reset */
290
291	/* Write Register 10 (misc control bits) */
292	#define BIT6 1 /* 6 bit/8bit sync */
293	#define LOOPMODE 2 /* SDLC Loop mode */
294	#define ABUNDER 4 /* Abort/flag on SDLC xmit underrun */
295	#define MARKIDLE 8 /* Mark/flag on idle */
296	#define GAOP 0x10 /* Go active on poll */
297	#define NRZ 0 /* NRZ mode */
298	#define NRZI 0x20 /* NRZI mode */
299	#define FM1 0x40 /* FM1 (transition = 1) */
300	#define FM0 0x60 /* FM0 (transition = 0) */
301	#define CRCPS 0x80 /* CRC Preset I/O */
302
303	/* Write Register 11 (Clock Mode control) */
304	#define TRxCXT 0 /* TRxC = Xtal output */
305	#define TRxCTC 1 /* TRxC = Transmit clock */
306	#define TRxCBR 2 /* TRxC = BR Generator Output */
307	#define TRxCDP 3 /* TRxC = DPLL output */
308	#define TRxCOI 4 /* TRxC O/I */
309	#define TCRTxCP 0 /* Transmit clock = RTxC pin */
310	#define TCTRxCP 8 /* Transmit clock = TRxC pin */
311	#define TCBR 0x10 /* Transmit clock = BR Generator output */
312	#define TCDPLL 0x18 /* Transmit clock = DPLL output */
313	#define RCRTxCP 0 /* Receive clock = RTxC pin */
314	#define RCTRxCP 0x20 /* Receive clock = TRxC pin */
315	#define RCBR 0x40 /* Receive clock = BR Generator output */
316	#define RCDPLL 0x60 /* Receive clock = DPLL output */
317	#define RTxCX 0x80 /* RTxC Xtal/No Xtal */
318
319	/* Write Register 12 (lower byte of baud rate generator time constant) */
320
321	/* Write Register 13 (upper byte of baud rate generator time constant) */
322
323	/* Write Register 14 (Misc control bits) */
324	#define BRENABL 1 /* Baud rate generator enable */
325	#define BRSRC 2 /* Baud rate generator source */
326	#define DTRREQ 4 /* DTR/Request function */
327	#define AUTOECHO 8 /* Auto Echo */
328	#define LOOPBAK 0x10 /* Local loopback */
329	#define SEARCH 0x20 /* Enter search mode */
330	#define RMC 0x40 /* Reset missing clock */
331	#define DISDPLL 0x60 /* Disable DPLL */
332	#define SSBR 0x80 /* Set DPLL source = BR generator */
333	#define SSRTxC 0xa0 /* Set DPLL source = RTxC */
334	#define SFMM 0xc0 /* Set FM mode */
335	#define SNRZI 0xe0 /* Set NRZI mode */
336
337	/* Write Register 15 (external/status interrupt control) */
338	#define ZCIE 2 /* Zero count IE */
339	#define DCDIE 8 /* DCD IE */
340	#define SYNCIE 0x10 /* Sync/hunt IE */
341	#define CTSIE 0x20 /* CTS IE */
342	#define TxUIE 0x40 /* Tx Underrun/EOM IE */
343	#define BRKIE 0x80 /* Break/Abort IE */
344
345
346	/* Read Register 0 */
347	#define Rx_CH_AV 0x1 /* Rx Character Available */
348	#define ZCOUNT 0x2 /* Zero count */
349	#define Tx_BUF_EMP 0x4 /* Tx Buffer empty */
350	#define DCD 0x8 /* DCD */
351	#define SYNC_HUNT 0x10 /* Sync/hunt */
352	#define CTS 0x20 /* CTS */
353	#define TxEOM 0x40 /* Tx underrun */
354	#define BRK_ABRT 0x80 /* Break/Abort */
355
356	/* Read Register 1 */
357	#define ALL_SNT 0x1 /* All sent */
358	/* Residue Data for 8 Rx bits/char programmed */
359	#define RES3 0x8 /* 0/3 */
360	#define RES4 0x4 /* 0/4 */
361	#define RES5 0xc /* 0/5 */
362	#define RES6 0x2 /* 0/6 */
363	#define RES7 0xa /* 0/7 */
364	#define RES8 0x6 /* 0/8 */
365	#define RES18 0xe /* 1/8 */
366	#define RES28 0x0 /* 2/8 */
367	/* Special Rx Condition Interrupts */
368	#define PAR_ERR 0x10 /* Parity error */
369	#define Rx_OVR 0x20 /* Rx Overrun Error */
370	#define FRM_ERR 0x40 /* CRC/Framing Error */
371	#define END_FR 0x80 /* End of Frame (SDLC) */
372
373	/* Read Register 2 (channel b only) - Interrupt vector */
374
375	/* Read Register 3 (interrupt pending register) ch a only */
376	#define CHBEXT 0x1 /* Channel B Ext/Stat IP */
377	#define CHBTxIP 0x2 /* Channel B Tx IP */
378	#define CHBRxIP 0x4 /* Channel B Rx IP */
379	#define CHAEXT 0x8 /* Channel A Ext/Stat IP */
380	#define CHATxIP 0x10 /* Channel A Tx IP */
381	#define CHARxIP 0x20 /* Channel A Rx IP */
382
383	/* Read Register 8 (receive data register) */
384
385	/* Read Register 10 (misc status bits) */
386	#define ONLOOP 2 /* On loop */
387	#define LOOPSEND 0x10 /* Loop sending */
388	#define CLK2MIS 0x40 /* Two clocks missing */
389	#define CLK1MIS 0x80 /* One clock missing */
390
391	/* Read Register 12 (lower byte of baud rate generator constant) */
392
393	/* Read Register 13 (upper byte of baud rate generator constant) */
394
395	/* Read Register 15 (value of WR 15) */
396
397	/* Misc macros */
398	#define ZS_CLEARERR(channel) (write_zsreg(channel, 0, ERR_RES))
399	#define ZS_CLEARFIFO(channel) do { volatile unsigned char garbage; \
400	garbage = read_zsdata(channel); \
401	garbage = read_zsdata(channel); \
402	garbage = read_zsdata(channel); \
403	} while(0)
404
405	#endif /* !(_DECSERIAL_H) */