OpenCores
URL https://opencores.org/ocsvn/or1k_old/or1k_old/trunk

Subversion Repositories or1k_old

[/] [or1k_old/] [trunk/] [uclinux/] [uClinux-2.0.x/] [drivers/] [char/] [68328serial.h] - Blame information for rev 1782

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 199 simons
/* 68328serial.h: Definitions for the mc68328 serial driver.
2
 *
3
 * Copyright (C) 1995       David S. Miller    <davem@caip.rutgers.edu>
4
 * Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>
5
 * Copyright (C) 1998, 1999 D. Jeff Dionne     <jeff@rt-control.com>
6
 * Copyright (C) 1999       Vladimir Gurevich  <vgurevic@cisco.com>
7
 *
8
 */
9
 
10
#ifndef _MC683XX_SERIAL_H
11
#define _MC683XX_SERIAL_H
12
 
13
#include <linux/config.h>
14
 
15
struct serial_struct {
16
        int     type;
17
        int     line;
18
        int     port;
19
        int     irq;
20
        int     flags;
21
        int     xmit_fifo_size;
22
        int     custom_divisor;
23
        int     baud_base;
24
        unsigned short  close_delay;
25
        char    reserved_char[2];
26
        int     hub6;  /* FIXME: We don't have AT&T Hub6 boards! */
27
        unsigned short  closing_wait; /* time to wait before closing */
28
        unsigned short  closing_wait2; /* no longer used... */
29
        int     reserved[4];
30
};
31
 
32
/*
33
 * For the close wait times, 0 means wait forever for serial port to
34
 * flush its output.  65535 means don't wait at all.
35
 */
36
#define S_CLOSING_WAIT_INF      0
37
#define S_CLOSING_WAIT_NONE     65535
38
 
39
/*
40
 * Definitions for S_struct (and serial_struct) flags field
41
 */
42
#define S_HUP_NOTIFY 0x0001 /* Notify getty on hangups and closes 
43
                                   on the callout port */
44
#define S_FOURPORT  0x0002      /* Set OU1, OUT2 per AST Fourport settings */
45
#define S_SAK   0x0004  /* Secure Attention Key (Orange book) */
46
#define S_SPLIT_TERMIOS 0x0008 /* Separate termios for dialin/callout */
47
 
48
#define S_SPD_MASK      0x0030
49
#define S_SPD_HI        0x0010  /* Use 56000 instead of 38400 bps */
50
 
51
#define S_SPD_VHI       0x0020  /* Use 115200 instead of 38400 bps */
52
#define S_SPD_CUST      0x0030  /* Use user-specified divisor */
53
 
54
#define S_SKIP_TEST     0x0040 /* Skip UART test during autoconfiguration */
55
#define S_AUTO_IRQ  0x0080 /* Do automatic IRQ during autoconfiguration */
56
#define S_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */
57
#define S_PGRP_LOCKOUT    0x0200 /* Lock out cua opens based on pgrp */
58
#define S_CALLOUT_NOHUP   0x0400 /* Don't do hangups for cua device */
59
 
60
#define S_FLAGS 0x0FFF  /* Possible legal S flags */
61
#define S_USR_MASK 0x0430       /* Legal flags that non-privileged
62
                                 * users can set or reset */
63
 
64
/* Internal flags used only by kernel/chr_drv/serial.c */
65
#define S_INITIALIZED   0x80000000 /* Serial port was initialized */
66
#define S_CALLOUT_ACTIVE        0x40000000 /* Call out device is active */
67
#define S_NORMAL_ACTIVE 0x20000000 /* Normal device is active */
68
#define S_BOOT_AUTOCONF 0x10000000 /* Autoconfigure port on bootup */
69
#define S_CLOSING               0x08000000 /* Serial port is closing */
70
#define S_CTS_FLOW              0x04000000 /* Do CTS flow control */
71
#define S_CHECK_CD              0x02000000 /* i.e., CLOCAL */
72
 
73
/* Software state per channel */
74
 
75
#ifdef __KERNEL__
76
 
77
/*
78
 * I believe this is the optimal setting that reduces the number of interrupts.
79
 * At high speeds the output might become a little "bursted" (use USTCNT_TXHE
80
 * if that bothers you), but in most cases it will not, since we try to
81
 * transmit characters every time rs_interrupt is called. Thus, quite often
82
 * you'll see that a receive interrupt occures before the transmit one.
83
 *                                  -- Vladimir Gurevich
84
 */
85
#define USTCNT_TX_INTR_MASK (USTCNT_TXEE)
86
 
87
/*
88
 * 68328 and 68EZ328 UARTS are a little bit different. EZ328 has special
89
 * "Old data interrupt" which occures whenever the data stay in the FIFO
90
 * longer than 30 bits time. This allows us to use FIFO without compromising
91
 * latency. '328 does not have this feature and without the real  328-based
92
 * board I would assume that RXRE is the safest setting.
93
 *
94
 * For EZ328 I use RXHE (Half empty) interrupt to reduce the number of
95
 * interrupts. RXFE (receive queue full) causes the system to loose data
96
 * at least at 115200 baud
97
 *
98
 * If your board is busy doing other stuff, you might consider to use
99
 * RXRE (data ready intrrupt) instead.
100
 *
101
 * The other option is to make these INTR masks run-time configurable, so
102
 * that people can dynamically adapt them according to the current usage.
103
 *                                  -- Vladimir Gurevich
104
 */
105
 
106
#if defined(CONFIG_M68EZ328)
107
#define USTCNT_RX_INTR_MASK (USTCNT_RXHE | USTCNT_ODEN)
108
#elif defined(CONFIG_M68328)
109
#define USTCNT_RX_INTR_MASK (USTCNT_RXRE)
110
#else
111
#error Please, define the Rx interrupt events for your CPU
112
#endif
113
 
114
/*
115
 * This is our internal structure for each serial port's state.
116
 *
117
 * Many fields are paralleled by the structure used by the serial_struct
118
 * structure.
119
 *
120
 * For definitions of the flags field, see tty.h
121
 */
122
 
123
struct m68k_serial {
124
        char soft_carrier;  /* Use soft carrier on this channel */
125
        char break_abort;   /* Is serial console in, so process brk/abrt */
126
        char is_cons;       /* Is this our console. */
127
 
128
        /* We need to know the current clock divisor
129
         * to read the bps rate the chip has currently
130
         * loaded.
131
         */
132
        unsigned char clk_divisor;  /* May be 1, 16, 32, or 64 */
133
        int baud;
134
        int                     magic;
135
        int                     baud_base;
136
        int                     port;
137
        int                     irq;
138
        int                     flags;          /* defined in tty.h */
139
        int                     type;           /* UART type */
140
        struct tty_struct       *tty;
141
        int                     read_status_mask;
142
        int                     ignore_status_mask;
143
        int                     timeout;
144
        int                     xmit_fifo_size;
145
        int                     custom_divisor;
146
        int                     x_char; /* xon/xoff character */
147
        int                     close_delay;
148
        unsigned short          closing_wait;
149
        unsigned short          closing_wait2;
150
        unsigned long           event;
151
        unsigned long           last_active;
152
        int                     line;
153
        int                     count;      /* # of fd on device */
154
        int                     blocked_open; /* # of blocked opens */
155
        long                    session; /* Session of opening process */
156
        long                    pgrp; /* pgrp of opening process */
157
        unsigned char           *xmit_buf;
158
        int                     xmit_head;
159
        int                     xmit_tail;
160
        int                     xmit_cnt;
161
        struct tq_struct        tqueue;
162
        struct tq_struct        tqueue_hangup;
163
        struct termios          normal_termios;
164
        struct termios          callout_termios;
165
        struct wait_queue       *open_wait;
166
        struct wait_queue       *close_wait;
167
};
168
 
169
 
170
#define SERIAL_MAGIC 0x5301
171
 
172
/*
173
 * The size of the serial xmit buffer is 1 page, or 4096 bytes
174
 */
175
#define SERIAL_XMIT_SIZE 4096
176
 
177
/*
178
 * Events are used to schedule things to happen at timer-interrupt
179
 * time, instead of at rs interrupt time.
180
 */
181
#define RS_EVENT_WRITE_WAKEUP   0
182
 
183
#endif /* __KERNEL__ */
184
#endif /* !(_MC683XX_SERIAL_H) */

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.