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