1/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
2/*
3 * include/linux/serial.h
4 *
5 * Copyright (C) 1992 by Theodore Ts'o.
6 *
7 * Redistribution of this file is permitted under the terms of the GNU
8 * Public License (GPL)
9 */
10
11#ifndef _UAPI_LINUX_SERIAL_H
12#define _UAPI_LINUX_SERIAL_H
13
14#include <linux/types.h>
15
16#include <linux/tty_flags.h>
17
18
19struct serial_struct {
20	int	type;
21	int	line;
22	unsigned int	port;
23	int	irq;
24	int	flags;
25	int	xmit_fifo_size;
26	int	custom_divisor;
27	int	baud_base;
28	unsigned short	close_delay;
29	char	io_type;
30	char	reserved_char[1];
31	int	hub6;
32	unsigned short	closing_wait; /* time to wait before closing */
33	unsigned short	closing_wait2; /* no longer used... */
34	unsigned char	*iomem_base;
35	unsigned short	iomem_reg_shift;
36	unsigned int	port_high;
37	unsigned long	iomap_base;	/* cookie passed into ioremap */
38};
39
40/*
41 * For the close wait times, 0 means wait forever for serial port to
42 * flush its output.  65535 means don't wait at all.
43 */
44#define ASYNC_CLOSING_WAIT_INF	0
45#define ASYNC_CLOSING_WAIT_NONE	65535
46
47/*
48 * These are the supported serial types.
49 */
50#define PORT_UNKNOWN	0
51#define PORT_8250	1
52#define PORT_16450	2
53#define PORT_16550	3
54#define PORT_16550A	4
55#define PORT_CIRRUS     5	/* usurped by cyclades.c */
56#define PORT_16650	6
57#define PORT_16650V2	7
58#define PORT_16750	8
59#define PORT_STARTECH	9	/* usurped by cyclades.c */
60#define PORT_16C950	10	/* Oxford Semiconductor */
61#define PORT_16654	11
62#define PORT_16850	12
63#define PORT_RSA	13	/* RSA-DV II/S card */
64#define PORT_MAX	13
65
66#define SERIAL_IO_PORT	0
67#define SERIAL_IO_HUB6	1
68#define SERIAL_IO_MEM	2
69#define SERIAL_IO_MEM32	  3
70#define SERIAL_IO_AU	  4
71#define SERIAL_IO_TSI	  5
72#define SERIAL_IO_MEM32BE 6
73#define SERIAL_IO_MEM16	7
74
75#define UART_CLEAR_FIFO		0x01
76#define UART_USE_FIFO		0x02
77#define UART_STARTECH		0x04
78#define UART_NATSEMI		0x08
79
80
81/*
82 * Multiport serial configuration structure --- external structure
83 */
84struct serial_multiport_struct {
85	int		irq;
86	int		port1;
87	unsigned char	mask1, match1;
88	int		port2;
89	unsigned char	mask2, match2;
90	int		port3;
91	unsigned char	mask3, match3;
92	int		port4;
93	unsigned char	mask4, match4;
94	int		port_monitor;
95	int	reserved[32];
96};
97
98/*
99 * Serial input interrupt line counters -- external structure
100 * Four lines can interrupt: CTS, DSR, RI, DCD
101 */
102struct serial_icounter_struct {
103	int cts, dsr, rng, dcd;
104	int rx, tx;
105	int frame, overrun, parity, brk;
106	int buf_overrun;
107	int reserved[9];
108};
109
110/*
111 * Serial interface for controlling RS485 settings on chips with suitable
112 * support. Set with TIOCSRS485 and get with TIOCGRS485 if supported by your
113 * platform. The set function returns the new state, with any unsupported bits
114 * reverted appropriately.
115 */
116
117struct serial_rs485 {
118	__u32	flags;			/* RS485 feature flags */
119#define SER_RS485_ENABLED		(1 << 0)	/* If enabled */
120#define SER_RS485_RTS_ON_SEND		(1 << 1)	/* Logical level for
121							   RTS pin when
122							   sending */
123#define SER_RS485_RTS_AFTER_SEND	(1 << 2)	/* Logical level for
124							   RTS pin after sent*/
125#define SER_RS485_RX_DURING_TX		(1 << 4)
126#define SER_RS485_TERMINATE_BUS		(1 << 5)	/* Enable bus
127							   termination
128							   (if supported) */
129	__u32	delay_rts_before_send;	/* Delay before send (milliseconds) */
130	__u32	delay_rts_after_send;	/* Delay after send (milliseconds) */
131	__u32	padding[5];		/* Memory is cheap, new structs
132					   are a royal PITA .. */
133};
134
135#endif /* _UAPI_LINUX_SERIAL_H */
136