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 19 struct 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 */ 84 struct 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 */ 102 struct 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 */ 116 117 struct 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