1 /* $NetBSD: dca.c,v 1.8 2023/04/21 22:44:27 tsutsui Exp $ */
2
3 /*
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1990, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)dca.c 8.1 (Berkeley) 6/10/93
37 */
38
39 #ifdef DCACONSOLE
40 #include <sys/param.h>
41 #include <dev/cons.h>
42
43 #include <hp300/stand/common/dcareg.h>
44 #include <hp300/stand/common/consdefs.h>
45 #include <hp300/stand/common/samachdep.h>
46
47 /* If not using 4.4 devs */
48 #ifndef dca_reset
49 #define dca_id dca_irid
50 #define dca_reset dca_id
51 #endif
52
53 struct dcadevice *dcacnaddr = 0;
54
55 #define DCACONSCODE 9 /* XXX */
56
57 void
dcaprobe(struct consdev * cp)58 dcaprobe(struct consdev *cp)
59 {
60 struct dcadevice *dca;
61
62 dcacnaddr = (struct dcadevice *) sctoaddr(DCACONSCODE);
63 if (badaddr((char *)dcacnaddr)) {
64 cp->cn_pri = CN_DEAD;
65 return;
66 }
67 #ifdef FORCEDCACONSOLE
68 cp->cn_pri = CN_REMOTE;
69 #else
70 dca = dcacnaddr;
71 switch (dca->dca_id) {
72 case DCAID0:
73 case DCAID1:
74 cp->cn_pri = CN_NORMAL;
75 break;
76 case DCAREMID0:
77 case DCAREMID1:
78 cp->cn_pri = CN_REMOTE;
79 break;
80 default:
81 cp->cn_pri = CN_DEAD;
82 break;
83 }
84
85 #endif
86 curcons_scode = DCACONSCODE;
87 }
88
89 void
dcainit(struct consdev * cp)90 dcainit(struct consdev *cp)
91 {
92 struct dcadevice *dca = dcacnaddr;
93
94 dca->dca_reset = 0xFF;
95 DELAY(100);
96 dca->dca_ic = 0;
97 dca->dca_cfcr = CFCR_DLAB;
98 dca->dca_data = DCABRD(9600) & 0xFF;
99 dca->dca_ier = DCABRD(9600) >> 8;
100 dca->dca_cfcr = CFCR_8BITS;
101 dca->dca_fifo =
102 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1;
103 dca->dca_mcr = MCR_DTR | MCR_RTS;
104 }
105
106 #ifndef SMALL
107 int
dcagetchar(dev_t dev)108 dcagetchar(dev_t dev)
109 {
110 struct dcadevice *dca = dcacnaddr;
111 short stat;
112 int c;
113
114 if (((stat = dca->dca_lsr) & LSR_RXRDY) == 0)
115 return 0;
116 c = dca->dca_data;
117 return c;
118 }
119 #else
120 int
dcagetchar(dev_t dev)121 dcagetchar(dev_t dev)
122 {
123
124 return 0;
125 }
126 #endif
127
128 void
dcaputchar(dev_t dev,int c)129 dcaputchar(dev_t dev, int c)
130 {
131 struct dcadevice *dca = dcacnaddr;
132 int timo;
133 short stat;
134
135 /* wait a reasonable time for the transmitter to come ready */
136 timo = 50000;
137 while (((stat = dca->dca_lsr) & LSR_TXRDY) == 0 && --timo)
138 ;
139 dca->dca_data = c;
140 /* wait for this transmission to complete */
141 timo = 1000000;
142 while (((stat = dca->dca_lsr) & LSR_TXRDY) == 0 && --timo)
143 ;
144 }
145 #endif
146