Home | History | Annotate | Line # | Download | only in dev 
      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
     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
     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
     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
     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