1 /* $NetBSD: mcclock_mainbus.c,v 1.12 2011/07/09 16:03:01 matt Exp $ */
2
3 /*
4 * Copyright (c) 1995, 1996 Carnegie-Mellon University.
5 * All rights reserved.
6 *
7 * Author: Chris G. Demetriou
8 *
9 * Permission to use, copy, modify and distribute this software and
10 * its documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation.
14 *
15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 *
19 * Carnegie Mellon requests users of this software to return to
20 *
21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
22 * School of Computer Science
23 * Carnegie Mellon University
24 * Pittsburgh PA 15213-3890
25 *
26 * any improvements or extensions that they make and grant Carnegie the
27 * rights to redistribute these changes.
28 */
29
30 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
31
32 __KERNEL_RCSID(0, "$NetBSD: mcclock_mainbus.c,v 1.12 2011/07/09 16:03:01 matt Exp $");
33
34 #include <sys/param.h>
35 #include <sys/bus.h>
36 #include <sys/device.h>
37 #include <sys/kernel.h>
38 #include <sys/systm.h>
39
40 #include <algor/autoconf.h>
41
42 #include <dev/clock_subr.h>
43
44 #include <dev/ic/mc146818reg.h>
45 #include <dev/ic/mc146818var.h>
46
47 int mcclock_mainbus_match(device_t, cfdata_t, void *);
48 void mcclock_mainbus_attach(device_t, device_t, void *);
49
50 CFATTACH_DECL_NEW(mcclock_mainbus, sizeof(struct mc146818_softc),
51 mcclock_mainbus_match, mcclock_mainbus_attach, NULL, NULL);
52
53 void mcclock_mainbus_write(struct mc146818_softc *, u_int, u_int);
54 u_int mcclock_mainbus_read(struct mc146818_softc *, u_int);
55
56 int
mcclock_mainbus_match(device_t parent,cfdata_t cf,void * aux)57 mcclock_mainbus_match(device_t parent, cfdata_t cf, void *aux)
58 {
59 struct mainbus_attach_args *ma = aux;
60
61 if (strcmp(ma->ma_name, cf->cf_name) == 0)
62 return (1);
63
64 return (0);
65 }
66
67 void
mcclock_mainbus_attach(device_t parent,device_t self,void * aux)68 mcclock_mainbus_attach(device_t parent, device_t self, void *aux)
69 {
70 struct mc146818_softc *sc = device_private(self);
71 struct mainbus_attach_args *ma = aux;
72
73 sc->sc_dev = self;
74 sc->sc_bst = ma->ma_st;
75 if (bus_space_map(sc->sc_bst, ma->ma_addr, 2, 0, &sc->sc_bsh))
76 panic("mcclock_mainbus_attach: couldn't map clock I/O space");
77
78 /*
79 * Turn interrupts off, just in case. Need to leave the SQWE
80 * set, because that's the DRAM refresh signal on Rev. B boards.
81 */
82 mcclock_mainbus_write(sc, MC_REGB, MC_REGB_SQWE | MC_REGB_BINARY |
83 MC_REGB_24HR);
84
85 sc->sc_mcread = mcclock_mainbus_read;
86 sc->sc_mcwrite = mcclock_mainbus_write;
87 sc->sc_getcent = NULL;
88 sc->sc_setcent = NULL;
89 sc->sc_flag = 0;
90
91 /* Algor uses year 1980 as offset */
92 sc->sc_year0 = 1980;
93
94 mc146818_attach(sc);
95
96 aprint_normal("\n");
97 }
98
99 void
mcclock_mainbus_write(struct mc146818_softc * sc,u_int reg,u_int datum)100 mcclock_mainbus_write(struct mc146818_softc *sc, u_int reg, u_int datum)
101 {
102 bus_space_tag_t iot = sc->sc_bst;
103 bus_space_handle_t ioh = sc->sc_bsh;
104
105 bus_space_write_1(iot, ioh, 0, reg);
106 bus_space_write_1(iot, ioh, 1, datum);
107 }
108
109 u_int
mcclock_mainbus_read(struct mc146818_softc * sc,u_int reg)110 mcclock_mainbus_read(struct mc146818_softc *sc, u_int reg)
111 {
112 bus_space_tag_t iot = sc->sc_bst;
113 bus_space_handle_t ioh = sc->sc_bsh;
114
115 bus_space_write_1(iot, ioh, 0, reg);
116 return bus_space_read_1(iot, ioh, 1);
117 }
118