1/*
2 * Private header file for the (dumb) serial driver
3 *
4 * Copyright (C) 1997 by Theodore Ts'o.
5 *
6 * Redistribution of this file is permitted under the terms of the GNU
7 * Public License (GPL)
8 */
9
10#ifndef _LINUX_SERIALP_H
11#define _LINUX_SERIALP_H
12
13/*
14 * This is our internal structure for each serial port's state.
15 *
16 * Many fields are paralleled by the structure used by the serial_struct
17 * structure.
18 *
19 * For definitions of the flags field, see tty.h
20 */
21
22#include <linux/termios.h>
23#include <linux/workqueue.h>
24#include <linux/interrupt.h>
25#include <linux/circ_buf.h>
26#include <linux/wait.h>
27
28struct serial_state {
29	int	magic;
30	int	baud_base;
31	unsigned long	port;
32	int	irq;
33	int	flags;
34	int	hub6;
35	int	type;
36	int	line;
37	int	revision;	/* Chip revision (950) */
38	int	xmit_fifo_size;
39	int	custom_divisor;
40	int	count;
41	u8	*iomem_base;
42	u16	iomem_reg_shift;
43	unsigned short	close_delay;
44	unsigned short	closing_wait; /* time to wait before closing */
45	struct async_icount	icount;
46	int	io_type;
47	struct async_struct *info;
48	struct pci_dev	*dev;
49};
50
51struct async_struct {
52	int			magic;
53	unsigned long		port;
54	int			hub6;
55	int			flags;
56	int			xmit_fifo_size;
57	struct serial_state	*state;
58	struct tty_struct 	*tty;
59	int			read_status_mask;
60	int			ignore_status_mask;
61	int			timeout;
62	int			quot;
63	int			x_char;	/* xon/xoff character */
64	int			close_delay;
65	unsigned short		closing_wait;
66	unsigned short		closing_wait2; /* obsolete */
67	int			IER; 	/* Interrupt Enable Register */
68	int			MCR; 	/* Modem control register */
69	int			LCR; 	/* Line control register */
70	int			ACR;	 /* 16950 Additional Control Reg. */
71	unsigned long		event;
72	unsigned long		last_active;
73	int			line;
74	int			blocked_open; /* # of blocked opens */
75 	struct circ_buf		xmit;
76 	spinlock_t		xmit_lock;
77	u8			*iomem_base;
78	u16			iomem_reg_shift;
79	int			io_type;
80	struct work_struct			work;
81	struct tasklet_struct	tlet;
82#ifdef DECLARE_WAITQUEUE
83	wait_queue_head_t	open_wait;
84	wait_queue_head_t	close_wait;
85	wait_queue_head_t	delta_msr_wait;
86#else
87	struct wait_queue	*open_wait;
88	struct wait_queue	*close_wait;
89	struct wait_queue	*delta_msr_wait;
90#endif
91	struct async_struct	*next_port; /* For the linked list */
92	struct async_struct	*prev_port;
93};
94
95#define CONFIGURED_SERIAL_PORT(info) ((info)->port || ((info)->iomem_base))
96
97#define SERIAL_MAGIC 0x5301
98#define SSTATE_MAGIC 0x5302
99
100/*
101 * Events are used to schedule things to happen at timer-interrupt
102 * time, instead of at rs interrupt time.
103 */
104#define RS_EVENT_WRITE_WAKEUP	0
105
106/*
107 * Multiport serial configuration structure --- internal structure
108 */
109struct rs_multiport_struct {
110	int		port1;
111	unsigned char	mask1, match1;
112	int		port2;
113	unsigned char	mask2, match2;
114	int		port3;
115	unsigned char	mask3, match3;
116	int		port4;
117	unsigned char	mask4, match4;
118	int		port_monitor;
119};
120
121#if defined(__alpha__) && !defined(CONFIG_PCI)
122/*
123 * Digital did something really horribly wrong with the OUT1 and OUT2
124 * lines on at least some ALPHA's.  The failure mode is that if either
125 * is cleared, the machine locks up with endless interrupts.
126 *
127 * This is still used by arch/mips/au1000/common/serial.c for some weird
128 * reason (mips != alpha!)
129 */
130#define ALPHA_KLUDGE_MCR  (UART_MCR_OUT2 | UART_MCR_OUT1)
131#elif defined(CONFIG_SBC8560)
132/*
133 * WindRiver did something similarly broken on their SBC8560 board. The
134 * UART tristates its IRQ output while OUT2 is clear, but they pulled
135 * the interrupt line _up_ instead of down, so if we register the IRQ
136 * while the UART is in that state, we die in an IRQ storm. */
137#define ALPHA_KLUDGE_MCR (UART_MCR_OUT2)
138#else
139#define ALPHA_KLUDGE_MCR 0
140#endif
141
142#endif /* _LINUX_SERIAL_H */
143