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
32struct sio_attach_args {
33	int channel;
34	int hwflags;
35};
36
37struct 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
45struct 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
54static inline uint16_t getsiocsr(struct sioreg *);
55static inline void setsioreg(struct sioreg *, int, int);
56
57static inline int siogetc(struct sioreg *);
58static inline void sioputc(struct sioreg *, int);
59
60static inline uint16_t
61getsiocsr(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
72static inline void
73setsioreg(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
81static inline int
82siogetc(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
95static inline void
96sioputc(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