2 * Private header file for the (dumb) serial driver
4 * Copyright (C) 1997 by Theodore Ts'o.
6 * Redistribution of this file is permitted under the terms of the GNU
10 #ifndef _LINUX_SERIALP_H
11 #define _LINUX_SERIALP_H
14 * This is our internal structure for each serial port's state.
16 * Many fields are paralleled by the structure used by the serial_struct
19 * For definitions of the flags field, see tty.h
22 #include <linux/config.h>
23 #include <linux/termios.h>
24 #include <linux/workqueue.h>
25 #include <linux/interrupt.h>
26 #include <linux/circ_buf.h>
27 #include <linux/wait.h>
38 int revision; /* Chip revision (950) */
44 unsigned short close_delay;
45 unsigned short closing_wait; /* time to wait before closing */
46 struct async_icount icount;
48 struct async_struct *info;
58 struct serial_state *state;
59 struct tty_struct *tty;
61 int ignore_status_mask;
64 int x_char; /* xon/xoff character */
66 unsigned short closing_wait;
67 unsigned short closing_wait2; /* obsolete */
68 int IER; /* Interrupt Enable Register */
69 int MCR; /* Modem control register */
70 int LCR; /* Line control register */
71 int ACR; /* 16950 Additional Control Reg. */
73 unsigned long last_active;
75 int blocked_open; /* # of blocked opens */
81 struct work_struct work;
82 struct tasklet_struct tlet;
83 #ifdef DECLARE_WAITQUEUE
84 wait_queue_head_t open_wait;
85 wait_queue_head_t close_wait;
86 wait_queue_head_t delta_msr_wait;
88 struct wait_queue *open_wait;
89 struct wait_queue *close_wait;
90 struct wait_queue *delta_msr_wait;
92 struct async_struct *next_port; /* For the linked list */
93 struct async_struct *prev_port;
96 #define CONFIGURED_SERIAL_PORT(info) ((info)->port || ((info)->iomem_base))
98 #define SERIAL_MAGIC 0x5301
99 #define SSTATE_MAGIC 0x5302
102 * Events are used to schedule things to happen at timer-interrupt
103 * time, instead of at rs interrupt time.
105 #define RS_EVENT_WRITE_WAKEUP 0
108 * Multiport serial configuration structure --- internal structure
110 struct rs_multiport_struct {
112 unsigned char mask1, match1;
114 unsigned char mask2, match2;
116 unsigned char mask3, match3;
118 unsigned char mask4, match4;
122 #if defined(__alpha__) && !defined(CONFIG_PCI)
124 * Digital did something really horribly wrong with the OUT1 and OUT2
125 * lines on at least some ALPHA's. The failure mode is that if either
126 * is cleared, the machine locks up with endless interrupts.
128 * This is still used by arch/mips/au1000/common/serial.c for some weird
129 * reason (mips != alpha!)
131 #define ALPHA_KLUDGE_MCR (UART_MCR_OUT2 | UART_MCR_OUT1)
132 #elif defined(CONFIG_SBC8560)
134 * WindRiver did something similarly broken on their SBC8560 board. The
135 * UART tristates its IRQ output while OUT2 is clear, but they pulled
136 * the interrupt line _up_ instead of down, so if we register the IRQ
137 * while the UART is in that state, we die in an IRQ storm. */
138 #define ALPHA_KLUDGE_MCR (UART_MCR_OUT2)
140 #define ALPHA_KLUDGE_MCR 0
143 #endif /* _LINUX_SERIAL_H */