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30 * BSDI com.h,v 2.2 1996/04/08 19:32:21 bostic Exp
35 /* com.h for doscmd int14.c */
39 /* NS16550A register definitions */
41 /* interrupt enable register */
43 #define IE_NOP 0xF0 /* not used */
44 #define IE_MODEM_STAT 0x08 /* modem status int. */
45 #define IE_LINE_STAT 0x04 /* receiver-line status int. */
46 #define IE_TRANS_HLD 0x02 /* transmitter holding register empty int. */
47 #define IE_RCV_DATA 0x01 /* received data available int. */
49 /* interrupt identification register */
51 #define II_FIFOS_EN 0xC0 /* if FIFOs are enabled */
52 #define II_NOP 0x38 /* not used */
53 #define II_INT_ID 0x06 /* mask: bits see below */
54 #define II_PEND_INT 0x01 /* 1=no interrupt pending */
56 /* bit masks for II_INT_ID */
58 #define II_LINE_STAT 0x06
59 #define II_RCV_DATA 0x04
60 #define II_TRANS_HLD 0x02
61 #define II_MODEM_STAT 0x00
63 /* FIFO control reg */
65 #define FC_FIFO_EN 0x01
67 /* line control register */
69 #define LC_DIV_ACC 0x80 /* divisor latch access bit */
70 #define LC_BRK_CTRL 0x40 /* set break control */
71 #define LC_S_PAR 0x20 /* stick parity */
72 #define LC_EVEN_P 0x10 /* even parity select */
73 #define LC_PAR_E 0x08 /* parity enable */
74 #define LC_STOP_B 0x04 /* number of stop bits (0 - 1 bit) */
75 #define LC_W_LEN 0x03 /* unsigned short length (00 - 5, 01 - 6 etc.) */
77 /* line status register */
79 #define LS_NOP 0x80 /* not used */
80 #define LS_X_SHFT_E 0x40 /* 0=data transfer, 1=transmitter idle */
81 #define LS_X_HOLD_E 0x20 /* 0=ready, 1=transferring character */
82 #define LS_BREAK 0x10 /* break received */
83 #define LS_FRM_ERR 0x08 /* framing error */
84 #define LS_PAR_ERR 0x04 /* parity error */
85 #define LS_OVRN_ERR 0x02 /* overrun error */
86 #define LS_RCV_DATA_RD 0x01 /* data received */
88 /* modem status register */
90 #define MS_DCD 0x80 /* Data Carrier Detect in */
91 #define MS_RI 0x40 /* Ring Indicator in */
92 #define MS_DSR 0x20 /* Data Set Ready in */
93 #define MS_CTS 0x10 /* Clear To Send in */
94 #define MS_DELTA_DCD 0x08 /* Data Carrier Detect changed state */
95 #define MS_DELTA_RI 0x04 /* Ring Indicator changed state */
96 #define MS_DELTA_DSR 0x02 /* Data Set Ready changed state */
97 #define MS_DELTA_CTS 0x01 /* Clear To Send changed state */
99 /* data structure definitions */
101 #define N_OF_COM_REGS 8
103 struct com_data_struct {
104 int fd; /* BSD/386 file descriptor */
105 char *path; /* BSD/386 pathname */
106 int addr; /* ISA I/O address */
107 unsigned char irq; /* ISA IRQ */
108 unsigned char flags; /* some general software flags */
110 struct queue *com_queue; /* XXX DEBUG obsolete MCL? */
112 unsigned char div_latch[2]; /* mirror of 16550 R0':R1' read/write */
113 unsigned char last_char_read; /* mirror of 16550 R0 read only */
114 unsigned char int_enable; /* mirror of 16550 R1 read/write */
115 unsigned char int_id; /* mirror of 16550 R2 read only */
116 unsigned char fifo_ctrl; /* mirror of 16550 R2 write only */
117 unsigned char line_ctrl; /* mirror of 16550 R3 read/write */
118 unsigned char modem_ctrl; /* mirror of 16550 R4 read/write */
119 unsigned char line_stat; /* mirror of 16550 R5 read/write */
120 unsigned char modem_stat; /* mirror of 16550 R6 read/write */
121 unsigned char uart_spare; /* mirror of 16550 R7 read/write */
124 /* DOS definitions -- parameters */
126 #define BITRATE_110 0x00
127 #define BITRATE_150 0x20
128 #define BITRATE_300 0x40
129 #define BITRATE_600 0x60
130 #define BITRATE_1200 0x80
131 #define BITRATE_2400 0xA0
132 #define BITRATE_4800 0xC0
133 #define BITRATE_9600 0xE0
134 #define PARITY_NONE 0x00
135 #define PARITY_ODD 0x08
136 #define PARITY_EVEN 0x18
137 #define STOPBIT_1 0x00
138 #define STOPBIT_2 0x04
139 #define TXLEN_7BITS 0x02
140 #define TXLEN_8BITS 0x03
142 /* DOS definitions -- return codes */
144 #define LS_SW_TIME_OUT LS_NOP /* return value used by DOS */
146 /* miscellaneous definitions */
148 #define DIV_LATCH_LOW 0
149 #define DIV_LATCH_HIGH 1
151 #define DIV_LATCH_LOW_WRITTEN 0x01
152 #define DIV_LATCH_HIGH_WRITTEN 0x02
153 #define DIV_LATCH_BOTH_WRITTEN 0x03
155 /* variable declarations */
159 /* routine declarations */
161 extern void int14(regcontext_t *REGS);
162 extern void com_set_line(struct com_data_struct *, unsigned char, unsigned char);
163 extern void init_com(int, char *, int, unsigned char);
164 extern u_char com_port_in(int);
165 extern void com_port_out(int, unsigned char);
167 /* end of file com.h */