/* $NetBSD: siovar.h,v 1.9 2021/09/25 15:18:38 tsutsui Exp $ */

/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Tohru Nishimura.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

struct sio_attach_args {
       int channel;
       int hwflags;
};

struct sioreg {
       volatile uint8_t sio_data;
       uint8_t pad0;
       volatile uint8_t sio_cmd;
       uint8_t pad1;
#define sio_stat sio_cmd
};

struct sio_softc {
       device_t sc_dev;
       struct sioreg *sc_ctl;
       struct {
               void (*ih_func)(void *);
               void *ih_arg;
       } sc_intrhand[2];
};

static inline uint16_t getsiocsr(struct sioreg *);
static inline void setsioreg(struct sioreg *, int, int);

static inline int siogetc(struct sioreg *);
static inline void sioputc(struct sioreg *, int);

static inline uint16_t
getsiocsr(struct sioreg *sio)
{
       uint16_t val;

       val = sio->sio_stat << 8;
       sio->sio_cmd = RR1;
       val |= sio->sio_stat;

       return val;
}

static inline void
setsioreg(struct sioreg *sio, int regno, int val)
{

       if (regno != WR0)
               sio->sio_cmd = regno;
       sio->sio_cmd = val;
}

static inline int
siogetc(struct sioreg *sio)
{
       int s, c;

       s = splhigh();
       while ((getsiocsr(sio) & RR_RXRDY) == 0)
               continue;
       c = sio->sio_data;
       splx(s);

       return c;
}

static inline void
sioputc(struct sioreg *sio, int c)
{
       int s;

       s = splhigh();
       while ((getsiocsr(sio) & RR_TXRDY) == 0)
               continue;
       sio->sio_cmd = WR0_RSTPEND;
       sio->sio_data = c;
       splx(s);
}