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
28 struct 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
51 struct 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 */
109 struct 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
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