source: rtems/c/src/libchip/serial/ns16550_p.h @ 4cd4c5a

4.104.114.84.9
Last change on this file since 4cd4c5a was 4cd4c5a, checked in by Joel Sherrill <joel.sherrill@…>, on Jun 22, 1998 at 11:07:51 AM

Moved set and get Register and Data type defininitions to serial.h.

Cleaned up spacing.

  • Property mode set to 100644
File size: 4.6 KB
Line 
1/*
2 *  COPYRIGHT (c) 1998 by Radstone Technology
3 *
4 *
5 * THIS FILE IS PROVIDED TO YOU, THE USER, "AS IS", WITHOUT WARRANTY OF ANY
6 * KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
7 * IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK
8 * AS TO THE QUALITY AND PERFORMANCE OF ALL CODE IN THIS FILE IS WITH YOU.
9 *
10 * You are hereby granted permission to use, copy, modify, and distribute
11 * this file, provided that this notice, plus the above copyright notice
12 * and disclaimer, appears in all copies. Radstone Technology will provide
13 * no support for this code.
14 *
15 *  $Id$
16 */
17
18#ifndef _NS16550_P_H_
19#define _NS16550_P_H_
20
21#ifdef __cplusplus
22extern "C" {
23#endif
24
25/*
26 * Define serial port read registers structure.
27 */
28
29typedef volatile struct _SP_READ_REGISTERS {
30    unsigned char ReceiveBuffer;
31    unsigned char InterruptEnable;
32    unsigned char InterruptId;
33    unsigned char LineControl;
34    unsigned char ModemControl;
35    unsigned char LineStatus;
36    unsigned char ModemStatus;
37    unsigned char ScratchPad;
38} SP_READ_REGISTERS, *PSP_READ_REGISTERS;
39
40#define NS16550_RECEIVE_BUFFER   0
41#define NS16550_INTERRUPT_ENABLE 1
42#define NS16550_INTERRUPT_ID     2
43#define NS16550_LINE_CONTROL     3
44#define NS16550_MODEM_CONTROL    4
45#define NS16550_LINE_STATUS      5
46#define NS16550_MODEM_STATUS     6
47#define NS16550_SCRATCH_PAD      7
48
49/*
50 * Define serial port write registers structure.
51 */
52
53typedef volatile struct _SP_WRITE_REGISTERS {
54    unsigned char TransmitBuffer;
55    unsigned char InterruptEnable;
56    unsigned char FifoControl;
57    unsigned char LineControl;
58    unsigned char ModemControl;
59    unsigned char Reserved1;
60    unsigned char ModemStatus;
61    unsigned char ScratchPad;
62} SP_WRITE_REGISTERS, *PSP_WRITE_REGISTERS;
63
64#define NS16550_TRANSMIT_BUFFER  0
65#define NS16550_FIFO_CONTROL     2
66
67/*
68 * Define serial port interrupt enable register structure.
69 */
70
71#define SP_INT_RX_ENABLE  0x01
72#define SP_INT_TX_ENABLE  0x02
73#define SP_INT_LS_ENABLE  0x04
74#define SP_INT_MS_ENABLE  0x08
75
76/*
77 * Define serial port interrupt id register structure.
78 */
79
80typedef struct _SP_INTERRUPT_ID {
81    unsigned char InterruptPending : 1;
82    unsigned char Identification : 3;
83    unsigned char Reserved1 : 2;
84    unsigned char FifoEnabled : 2;
85} SP_INTERRUPT_ID, *PSP_INTERRUPT_ID;
86
87/*
88 * Define serial port fifo control register structure.
89 */
90
91#define SP_FIFO_ENABLE  0x01
92#define SP_FIFO_RXRST 0x02
93#define SP_FIFO_TXRST 0x04
94#define SP_FIFO_DMA   0x08
95#define SP_FIFO_RXLEVEL 0xc0
96
97/*
98 * Define serial port line control register structure.
99 */
100
101#define SP_LINE_SIZE  0x03
102#define SP_LINE_STOP  0x04
103#define SP_LINE_PAR   0x08
104#define SP_LINE_ODD   0x10
105#define SP_LINE_STICK 0x20
106#define SP_LINE_BREAK 0x40
107#define SP_LINE_DLAB  0x80
108
109/*
110 * Line status register character size definitions.
111 */
112
113#define FIVE_BITS 0x0                   /* five bits per character */
114#define SIX_BITS 0x1                    /* six bits per character */
115#define SEVEN_BITS 0x2                  /* seven bits per character */
116#define EIGHT_BITS 0x3                  /* eight bits per character */
117
118/*
119 * Line speed divisor definition.
120 */
121
122#define NS16550_Baud(baud_rate) (115200/baud_rate)
123
124/*
125 * Define serial port modem control register structure.
126 */
127
128#define SP_MODEM_DTR  0x01
129#define SP_MODEM_RTS  0x02
130#define SP_MODEM_IRQ  0x08
131#define SP_MODEM_LOOP 0x10
132#define SP_MODEM_DIV4 0x80
133
134/*
135 * Define serial port line status register structure.
136 */
137
138#define SP_LSR_RDY    0x01
139#define SP_LSR_EOVRUN 0x02
140#define SP_LSR_EPAR   0x04
141#define SP_LSR_EFRAME 0x08
142#define SP_LSR_BREAK  0x10
143#define SP_LSR_THOLD  0x20
144#define SP_LSR_TX   0x40
145#define SP_LSR_EFIFO  0x80
146
147typedef struct _ns16550_context
148{
149        unsigned8       ucModemCtrl;
150} ns16550_context;
151
152/*
153 * Driver functions
154 */
155
156static boolean ns16550_probe(int minor);
157
158static void ns16550_init(int minor);
159
160static int ns16550_open(
161  int major,
162  int minor,
163  void  * arg
164);
165
166static int ns16550_close(
167  int major,
168  int minor,
169  void  * arg
170);
171
172static void ns16550_write_polled(
173  int   minor, 
174  char  cChar
175);
176
177static int ns16550_assert_RTS(
178  int minor
179);
180
181static int ns16550_negate_RTS(
182  int minor
183);
184
185static int ns16550_assert_DTR(
186  int minor
187);
188
189static int ns16550_negate_DTR(
190  int minor
191);
192
193static void ns16550_initialize_interrupts(int minor);
194
195static int ns16550_flush(int major, int minor, void *arg);
196
197static int ns16550_write_support_int(
198  int   minor,
199  const char *buf,
200  int   len
201);
202
203static int ns16550_write_support_polled(
204  int   minor,
205  const char *buf,
206  int   len
207  );
208
209static int ns16550_inbyte_nonblocking_polled(
210  int minor
211);
212
213#ifdef __cplusplus
214}
215#endif
216
217#endif /* _NS16550_P_H_ */
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