1 /* $NetBSD: com.c,v 1.4 2008/04/28 20:23:21 martin Exp $ */
2
3 /*-
4 * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Charles M. Hannum.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * Copyright (c) 1991 The Regents of the University of California.
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 3. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)com.c 7.5 (Berkeley) 5/16/91
61 */
62
63 #include <sys/param.h>
64
65 #include <lib/libsa/stand.h>
66
67 #include <hpcmips/vr/vripreg.h>
68 #include <hpcmips/vr/cmureg.h>
69
70 #include <dev/ic/comreg.h>
71 #include <dev/ic/ns16550reg.h>
72 #include <dev/ic/st16650reg.h>
73 #define com_lcr com_cfcr
74
75 #include "extern.h"
76
77 #if 0
78 #define VRCOM_FREQ 18432000 /* 18.432kHz */
79 #endif
80
81 int
iskey(void)82 iskey(void)
83 {
84 return ISSET(REGREAD_1(VR4181_SIU_ADDR, com_lsr), LSR_RXRDY);
85 }
86
87 int
getchar(void)88 getchar(void)
89 {
90 u_int8_t stat;
91 u_int8_t c;
92
93 /* block until a character becomes available */
94 while (!ISKEY)
95 ;
96
97 c = REGREAD_1(VR4181_SIU_ADDR, com_data);
98 stat = REGREAD_1(VR4181_SIU_ADDR, com_iir);
99
100 return c;
101 }
102
103 static void
comcnputc(int c)104 comcnputc(int c)
105 {
106 int timo;
107
108 /* wait for any pending transmission to finish */
109 timo = 150000;
110 while (!ISSET(REGREAD_1(VR4181_SIU_ADDR, com_lsr), LSR_TXRDY)
111 && --timo)
112 continue;
113
114 REGWRITE_1(VR4181_SIU_ADDR, com_data, c);
115
116 /* wait for this transmission to complete */
117 timo = 1500000;
118 while (!ISSET(REGREAD_1(VR4181_SIU_ADDR, com_lsr), LSR_TXRDY)
119 && --timo)
120 continue;
121 }
122
123 void
putchar(int c)124 putchar(int c)
125 {
126 if (c == '\n')
127 comcnputc('\r');
128 comcnputc(c);
129 }
130
131 /*
132 * Initialize UART for use as console or KGDB line.
133 */
134 void
comcninit(void)135 comcninit(void)
136 {
137 int rate;
138
139 /* enable divisor latch access and set bit rate */
140 REGWRITE_1(VR4181_SIU_ADDR, com_lcr, LCR_DLAB);
141 rate = 10; /* 115200bps with VRCOM_FREQ */
142 REGWRITE_1(VR4181_SIU_ADDR, com_dlbl, rate);
143 REGWRITE_1(VR4181_SIU_ADDR, com_dlbh, rate >> 8);
144
145 /*
146 * disable divisor latch access and,
147 * set "8bit non-parity 1 stop bit"
148 */
149 REGWRITE_1(VR4181_SIU_ADDR, com_lcr, LCR_8BITS);
150
151 /* disable all interrupt */
152 REGWRITE_1(VR4181_SIU_ADDR, com_ier, 0);
153
154 /* enable FIFO */
155 REGWRITE_1(VR4181_SIU_ADDR, com_fifo,
156 FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1);
157
158 /* set DTR and RTS low */
159 REGWRITE_1(VR4181_SIU_ADDR, com_mcr, MCR_DTR | MCR_RTS);
160 }
161