1 /* $NetBSD: mcclock_gbus.c,v 1.5 2024/03/06 07:34:11 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 1997 by Matthew Jacob
5 * NASA AMES Research Center.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice immediately at the beginning of the file, without modification,
13 * this list of conditions, and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
24 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
34
35 __KERNEL_RCSID(0, "$NetBSD: mcclock_gbus.c,v 1.5 2024/03/06 07:34:11 thorpej Exp $");
36
37 #include <sys/param.h>
38 #include <sys/kernel.h>
39 #include <sys/systm.h>
40 #include <sys/device.h>
41
42 #include <sys/bus.h>
43
44 #include <alpha/gbus/gbusvar.h>
45
46 #include <dev/clock_subr.h>
47
48 #include <dev/ic/mc146818reg.h>
49 #include <dev/ic/mc146818var.h>
50
51 #include <alpha/alpha/mcclockvar.h>
52
53 #include "ioconf.h"
54
55 static int mcclock_gbus_match(device_t, cfdata_t, void *);
56 static void mcclock_gbus_attach(device_t, device_t, void *);
57
58 CFATTACH_DECL_NEW(mcclock_gbus, sizeof(struct mcclock_softc),
59 mcclock_gbus_match, mcclock_gbus_attach, NULL, NULL);
60
61 static void mcclock_gbus_write(struct mc146818_softc *, u_int, u_int);
62 static u_int mcclock_gbus_read(struct mc146818_softc *, u_int);
63
64 static int
mcclock_gbus_match(device_t parent,cfdata_t cf,void * aux)65 mcclock_gbus_match(device_t parent, cfdata_t cf, void *aux)
66 {
67 struct gbus_attach_args *ga = aux;
68
69 if (strcmp(ga->ga_name, mcclock_cd.cd_name))
70 return (0);
71 return (1);
72 }
73
74 static void
mcclock_gbus_attach(device_t parent,device_t self,void * aux)75 mcclock_gbus_attach(device_t parent, device_t self, void *aux)
76 {
77 struct mcclock_softc *msc = device_private(self);
78 struct mc146818_softc *sc = &msc->sc_mc146818;
79 struct gbus_attach_args *ga = aux;
80
81 sc->sc_dev = self;
82 sc->sc_bst = ga->ga_iot;
83
84 if (bus_space_map(sc->sc_bst, ga->ga_offset, MC_NREGS+MC_NVRAM_SIZE,
85 0, &sc->sc_bsh) != 0) {
86 panic("mcclock_gbus_attach: couldn't map clock I/O space");
87 }
88
89 /* The RTC is accessible only by a CPU on the primary CPU module. */
90 msc->sc_primary_only = true;
91
92 sc->sc_mcread = mcclock_gbus_read;
93 sc->sc_mcwrite = mcclock_gbus_write;
94
95 mcclock_attach(msc);
96 }
97
98 static void
mcclock_gbus_write(struct mc146818_softc * sc,u_int reg,u_int val)99 mcclock_gbus_write(struct mc146818_softc *sc, u_int reg, u_int val)
100 {
101 bus_space_write_1(sc->sc_bst, sc->sc_bsh, reg, (uint8_t)val);
102 }
103
104 static u_int
mcclock_gbus_read(struct mc146818_softc * sc,u_int reg)105 mcclock_gbus_read(struct mc146818_softc *sc, u_int reg)
106 {
107 return bus_space_read_1(sc->sc_bst, sc->sc_bsh, reg);
108 }
109