/*      $NetBSD: xpcmd.c,v 1.1 2022/06/10 21:42:23 tsutsui Exp $        */

/*
* Copyright (c) 2018 Yosuke Sugahara. All rights reserved.
*
* 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 AUTHOR ``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 AUTHOR 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.
*/

#include <sys/types.h>

#if defined(_KERNEL)

#include <sys/param.h>

#include <luna68k/dev/xpbusvar.h>
#include <luna68k/dev/xpcmd.h>
#include <luna68k/dev/xplx/xplxdefs.h>
#else

#include <stdint.h>
#include "xpbusvar.h"
#include "xpcmd.h"
#include "xplx/xplxdefs.h"

#endif

enum {
       READY = 0,
       CMD = 1,
       RESULT = 2,
};

static int
xp_waitfor_ready(int xplx_devid, int timeout)
{
       uint16_t addr = XPLX_VAR_BASE + xplx_devid * 16;

       do {
               int r;
               r = xp_readmem8(addr + READY);
               if (r)
                       return 1;
               delay(100);
       } while (timeout--);
       return 0;
}

int
xp_cmd_nowait(int xplx_devid, uint8_t cmd)
{
       uint8_t r;

       uint16_t addr = XPLX_VAR_BASE + xplx_devid * 16;
       r = xp_waitfor_ready(xplx_devid, 1000);
       if (r == 0)
               return 0;
       xp_writemem8(addr + RESULT, 0);
       xp_writemem8(addr + CMD, cmd);
       return XPLX_R_OK;
}

int
xp_cmd(int xplx_devid, uint8_t cmd)
{
       uint8_t rv;
       uint8_t r;
       uint16_t addr = XPLX_VAR_BASE + xplx_devid * 16;

       r = xp_waitfor_ready(xplx_devid, 1000);
       if (r == 0)
               return 0;
       xp_writemem8(addr + RESULT, 0);
       xp_writemem8(addr + CMD, cmd);
       while ((rv = xp_readmem8(addr + RESULT)) == 0)
               continue;
       return rv;
}