1 /* $NetBSD: siovar.h,v 1.9 2021/09/25 15:18:38 tsutsui Exp $ */
2
3 /*-
4 * Copyright (c) 2000 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Tohru Nishimura.
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 struct sio_attach_args {
33 int channel;
34 int hwflags;
35 };
36
37 struct sioreg {
38 volatile uint8_t sio_data;
39 uint8_t pad0;
40 volatile uint8_t sio_cmd;
41 uint8_t pad1;
42 #define sio_stat sio_cmd
43 };
44
45 struct sio_softc {
46 device_t sc_dev;
47 struct sioreg *sc_ctl;
48 struct {
49 void (*ih_func)(void *);
50 void *ih_arg;
51 } sc_intrhand[2];
52 };
53
54 static inline uint16_t getsiocsr(struct sioreg *);
55 static inline void setsioreg(struct sioreg *, int, int);
56
57 static inline int siogetc(struct sioreg *);
58 static inline void sioputc(struct sioreg *, int);
59
60 static inline uint16_t
getsiocsr(struct sioreg * sio)61 getsiocsr(struct sioreg *sio)
62 {
63 uint16_t val;
64
65 val = sio->sio_stat << 8;
66 sio->sio_cmd = RR1;
67 val |= sio->sio_stat;
68
69 return val;
70 }
71
72 static inline void
setsioreg(struct sioreg * sio,int regno,int val)73 setsioreg(struct sioreg *sio, int regno, int val)
74 {
75
76 if (regno != WR0)
77 sio->sio_cmd = regno;
78 sio->sio_cmd = val;
79 }
80
81 static inline int
siogetc(struct sioreg * sio)82 siogetc(struct sioreg *sio)
83 {
84 int s, c;
85
86 s = splhigh();
87 while ((getsiocsr(sio) & RR_RXRDY) == 0)
88 continue;
89 c = sio->sio_data;
90 splx(s);
91
92 return c;
93 }
94
95 static inline void
sioputc(struct sioreg * sio,int c)96 sioputc(struct sioreg *sio, int c)
97 {
98 int s;
99
100 s = splhigh();
101 while ((getsiocsr(sio) & RR_TXRDY) == 0)
102 continue;
103 sio->sio_cmd = WR0_RSTPEND;
104 sio->sio_data = c;
105 splx(s);
106 }
107