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 _LINUX_SERIAL_H
12#define _LINUX_SERIAL_H
13
14#include <linux/const.h>
15#include <linux/types.h>
16
17#include <linux/tty_flags.h>
18
19
20struct serial_struct {
21 int type;
22 int line;
23 unsigned int port;
24 int irq;
25 int flags;
26 int xmit_fifo_size;
27 int custom_divisor;
28 int baud_base;
29 unsigned short close_delay;
30 char io_type;
31 char reserved_char[1];
32 int hub6;
33 unsigned short closing_wait; /* time to wait before closing */
34 unsigned short closing_wait2; /* no longer used... */
35 unsigned char *iomem_base;
36 unsigned short iomem_reg_shift;
37 unsigned int port_high;
38 unsigned long iomap_base; /* cookie passed into ioremap */
39};
40
41/*
42 * For the close wait times, 0 means wait forever for serial port to
43 * flush its output. 65535 means don't wait at all.
44 */
45#define ASYNC_CLOSING_WAIT_INF 0
46#define ASYNC_CLOSING_WAIT_NONE 65535
47
48/*
49 * These are the supported serial types.
50 */
51#define PORT_UNKNOWN 0
52#define PORT_8250 1
53#define PORT_16450 2
54#define PORT_16550 3
55#define PORT_16550A 4
56#define PORT_CIRRUS 5
57#define PORT_16650 6
58#define PORT_16650V2 7
59#define PORT_16750 8
60#define PORT_STARTECH 9
61#define PORT_16C950 10 /* Oxford Semiconductor */
62#define PORT_16654 11
63#define PORT_16850 12
64#define PORT_RSA 13 /* RSA-DV II/S card */
65#define PORT_MAX 13
66
67#define SERIAL_IO_PORT 0
68#define SERIAL_IO_HUB6 1
69#define SERIAL_IO_MEM 2
70#define SERIAL_IO_MEM32 3
71#define SERIAL_IO_AU 4
72#define SERIAL_IO_TSI 5
73#define SERIAL_IO_MEM32BE 6
74#define SERIAL_IO_MEM16 7
75
76#define UART_CLEAR_FIFO 0x01
77#define UART_USE_FIFO 0x02
78#define UART_STARTECH 0x04
79#define UART_NATSEMI 0x08
80
81
82/*
83 * Multiport serial configuration structure --- external structure
84 */
85struct serial_multiport_struct {
86 int irq;
87 int port1;
88 unsigned char mask1, match1;
89 int port2;
90 unsigned char mask2, match2;
91 int port3;
92 unsigned char mask3, match3;
93 int port4;
94 unsigned char mask4, match4;
95 int port_monitor;
96 int reserved[32];
97};
98
99/*
100 * Serial input interrupt line counters -- external structure
101 * Four lines can interrupt: CTS, DSR, RI, DCD
102 */
103struct serial_icounter_struct {
104 int cts, dsr, rng, dcd;
105 int rx, tx;
106 int frame, overrun, parity, brk;
107 int buf_overrun;
108 int reserved[9];
109};
110
111/**
112 * struct serial_rs485 - serial interface for controlling RS485 settings.
113 * @flags: RS485 feature flags.
114 * @delay_rts_before_send: Delay before send (milliseconds).
115 * @delay_rts_after_send: Delay after send (milliseconds).
116 * @addr_recv: Receive filter for RS485 addressing mode
117 * (used only when %SER_RS485_ADDR_RECV is set).
118 * @addr_dest: Destination address for RS485 addressing mode
119 * (used only when %SER_RS485_ADDR_DEST is set).
120 * @padding0: Padding (set to zero).
121 * @padding1: Padding (set to zero).
122 * @padding: Deprecated, use @padding0 and @padding1 instead.
123 * Do not use with @addr_recv and @addr_dest (due to
124 * overlap).
125 *
126 * Serial interface for controlling RS485 settings on chips with suitable
127 * support. Set with TIOCSRS485 and get with TIOCGRS485 if supported by your
128 * platform. The set function returns the new state, with any unsupported bits
129 * reverted appropriately.
130 *
131 * The flag bits are:
132 *
133 * * %SER_RS485_ENABLED - RS485 enabled.
134 * * %SER_RS485_RTS_ON_SEND - Logical level for RTS pin when sending.
135 * * %SER_RS485_RTS_AFTER_SEND - Logical level for RTS pin after sent.
136 * * %SER_RS485_RX_DURING_TX - Full-duplex RS485 line.
137 * * %SER_RS485_TERMINATE_BUS - Enable bus termination (if supported).
138 * * %SER_RS485_ADDRB - Enable RS485 addressing mode.
139 * * %SER_RS485_ADDR_RECV - Receive address filter (enables @addr_recv). Requires %SER_RS485_ADDRB.
140 * * %SER_RS485_ADDR_DEST - Destination address (enables @addr_dest). Requires %SER_RS485_ADDRB.
141 * * %SER_RS485_MODE_RS422 - Enable RS422. Requires %SER_RS485_ENABLED.
142 */
143struct serial_rs485 {
144 __u32 flags;
145#define SER_RS485_ENABLED _BITUL(0)
146#define SER_RS485_RTS_ON_SEND _BITUL(1)
147#define SER_RS485_RTS_AFTER_SEND _BITUL(2)
148/* Placeholder for bit 3: SER_RS485_RTS_BEFORE_SEND, which isn't used anymore */
149#define SER_RS485_RX_DURING_TX _BITUL(4)
150#define SER_RS485_TERMINATE_BUS _BITUL(5)
151#define SER_RS485_ADDRB _BITUL(6)
152#define SER_RS485_ADDR_RECV _BITUL(7)
153#define SER_RS485_ADDR_DEST _BITUL(8)
154#define SER_RS485_MODE_RS422 _BITUL(9)
155
156 __u32 delay_rts_before_send;
157 __u32 delay_rts_after_send;
158
159 /* The fields below are defined by flags */
160 union {
161 __u32 padding[5]; /* Memory is cheap, new structs are a pain */
162
163 struct {
164 __u8 addr_recv;
165 __u8 addr_dest;
166 __u8 padding0[2];
167 __u32 padding1[4];
168 };
169 };
170};
171
172/*
173 * Serial interface for controlling ISO7816 settings on chips with suitable
174 * support. Set with TIOCSISO7816 and get with TIOCGISO7816 if supported by
175 * your platform.
176 */
177struct serial_iso7816 {
178 __u32 flags; /* ISO7816 feature flags */
179#define SER_ISO7816_ENABLED (1 << 0)
180#define SER_ISO7816_T_PARAM (0x0f << 4)
181#define SER_ISO7816_T(t) (((t) & 0x0f) << 4)
182 __u32 tg;
183 __u32 sc_fi;
184 __u32 sc_di;
185 __u32 clk;
186 __u32 reserved[5];
187};
188
189#endif /* _LINUX_SERIAL_H */