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
37 struct 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
45 static inline void
sx_write(struct sx_softc * sc,int addr,uint32_t val)46 sx_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
51 static inline uint32_t
sx_read(struct sx_softc * sc,int addr)52 sx_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 */
63 static inline void
sx_wait(struct sx_softc * sc)64 sx_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
77 void sx_dump(void);
78
79 #endif
80