1/*	$NetBSD: sxvar.h,v 1.5 2023/06/13 10:09:31 macallan Exp $	*/
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Michael Lorenz.
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#ifndef SXVAR_H
33#define SXVAR_H
34
35#include <sparc/dev/sxreg.h>
36
37struct sx_softc {
38	device_t		sc_dev;
39	bus_addr_t		sc_uregs;
40	bus_space_tag_t		sc_tag;
41	bus_space_handle_t	sc_regh;
42	int			sc_cnt;
43};
44
45static inline void
46sx_write(struct sx_softc *sc, int addr, uint32_t val)
47{
48	bus_space_write_4(sc->sc_tag, sc->sc_regh, addr, val);
49}
50
51static inline uint32_t
52sx_read(struct sx_softc *sc, int addr)
53{
54	return bus_space_read_4(sc->sc_tag, sc->sc_regh, addr);
55}
56
57/*
58 * to be used before issuing SX instructions
59 * this will periodically allow the instruction queue to drain in order
60 * to avoid excessive MBus relinquish & retry cycles during long SX ops
61 * which may cause us to lose interrupts
62 */
63static inline void
64sx_wait(struct sx_softc *sc)
65{
66	uint32_t reg;
67	if (sc->sc_cnt > 6) {
68		do {
69			reg = bus_space_read_4(sc->sc_tag, sc->sc_regh,
70						 SX_CONTROL_STATUS);
71		} while ((reg & SX_MT) == 0);
72		sc->sc_cnt = 0;
73	} else
74		sc->sc_cnt++;
75}
76
77void sx_dump(void);
78
79#endif
80