1/*	$NetBSD: xpcmd.c,v 1.1 2022/06/10 21:42:23 tsutsui Exp $	*/
2
3/*
4 * Copyright (c) 2018 Yosuke Sugahara. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/types.h>
29
30#if defined(_KERNEL)
31
32#include <sys/param.h>
33
34#include <luna68k/dev/xpbusvar.h>
35#include <luna68k/dev/xpcmd.h>
36#include <luna68k/dev/xplx/xplxdefs.h>
37#else
38
39#include <stdint.h>
40#include "xpbusvar.h"
41#include "xpcmd.h"
42#include "xplx/xplxdefs.h"
43
44#endif
45
46enum {
47	READY = 0,
48	CMD = 1,
49	RESULT = 2,
50};
51
52static int
53xp_waitfor_ready(int xplx_devid, int timeout)
54{
55	uint16_t addr = XPLX_VAR_BASE + xplx_devid * 16;
56
57	do {
58		int r;
59		r = xp_readmem8(addr + READY);
60		if (r)
61			return 1;
62		delay(100);
63	} while (timeout--);
64	return 0;
65}
66
67int
68xp_cmd_nowait(int xplx_devid, uint8_t cmd)
69{
70	uint8_t r;
71
72	uint16_t addr = XPLX_VAR_BASE + xplx_devid * 16;
73	r = xp_waitfor_ready(xplx_devid, 1000);
74	if (r == 0)
75		return 0;
76	xp_writemem8(addr + RESULT, 0);
77	xp_writemem8(addr + CMD, cmd);
78	return XPLX_R_OK;
79}
80
81int
82xp_cmd(int xplx_devid, uint8_t cmd)
83{
84	uint8_t rv;
85	uint8_t r;
86	uint16_t addr = XPLX_VAR_BASE + xplx_devid * 16;
87
88	r = xp_waitfor_ready(xplx_devid, 1000);
89	if (r == 0)
90		return 0;
91	xp_writemem8(addr + RESULT, 0);
92	xp_writemem8(addr + CMD, cmd);
93	while ((rv = xp_readmem8(addr + RESULT)) == 0)
94		continue;
95	return rv;
96}
97