1 /* $NetBSD: mcclock_isa.c,v 1.14 2011/07/08 18:49:48 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_isa.c,v 1.14 2011/07/08 18:49:48 matt Exp $");
33
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/systm.h>
37 #include <sys/device.h>
38
39 #include <sys/bus.h>
40
41 #include <dev/clock_subr.h>
42 #include <dev/ic/mc146818reg.h>
43 #include <dev/ic/mc146818var.h>
44
45 #include <dev/isa/isareg.h>
46 #include <dev/isa/isavar.h>
47
48 /*
49 * Note the Algorithmics PMON firmware uses a different year base.
50 */
51 #define ALGOR_YEAR_ZERO 1920
52
53 static int mcclock_isa_match(device_t, cfdata_t, void *);
54 static void mcclock_isa_attach(device_t, device_t, void *);
55
56 CFATTACH_DECL_NEW(mcclock_isa, sizeof(struct mc146818_softc),
57 mcclock_isa_match, mcclock_isa_attach, NULL, NULL);
58
59 static void mcclock_isa_write(struct mc146818_softc *, u_int, u_int);
60 static u_int mcclock_isa_read(struct mc146818_softc *, u_int);
61
62 static int
mcclock_isa_match(device_t parent,cfdata_t cf,void * aux)63 mcclock_isa_match(device_t parent, cfdata_t cf, void *aux)
64 {
65 struct isa_attach_args *ia = aux;
66 bus_space_handle_t ioh;
67
68 if (ia->ia_nio < 1 ||
69 (ia->ia_io[0].ir_addr != ISA_UNKNOWN_PORT &&
70 ia->ia_io[0].ir_addr != IO_RTC))
71 return (0);
72
73 if (ia->ia_niomem > 0 &&
74 (ia->ia_iomem[0].ir_addr != ISA_UNKNOWN_IOMEM))
75 return (0);
76
77 if (ia->ia_nirq > 0 &&
78 (ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ))
79 return (0);
80
81 if (ia->ia_ndrq > 0 &&
82 (ia->ia_drq[0].ir_drq != ISA_UNKNOWN_DRQ))
83 return (0);
84
85 if (bus_space_map(ia->ia_iot, IO_RTC, 0x2, 0, &ioh))
86 return (0);
87
88 bus_space_unmap(ia->ia_iot, ioh, 0x2);
89
90 ia->ia_nio = 1;
91 ia->ia_io[0].ir_addr = IO_RTC;
92 ia->ia_io[0].ir_size = 0x02;
93
94 ia->ia_niomem = 0;
95 ia->ia_nirq = 0;
96 ia->ia_ndrq = 0;
97
98 return (1);
99 }
100
101 static void
mcclock_isa_attach(device_t parent,device_t self,void * aux)102 mcclock_isa_attach(device_t parent, device_t self, void *aux)
103 {
104 struct mc146818_softc *sc = device_private(self);
105 struct isa_attach_args *ia = aux;
106
107 sc->sc_dev = self;
108 sc->sc_bst = ia->ia_iot;
109 if (bus_space_map(sc->sc_bst, ia->ia_io[0].ir_addr,
110 ia->ia_io[0].ir_size, 0, &sc->sc_bsh))
111 panic("mcclock_isa_attach: couldn't map clock I/O space");
112
113 sc->sc_year0 = ALGOR_YEAR_ZERO;
114 sc->sc_flag = MC146818_NO_CENT_ADJUST;
115 sc->sc_mcread = mcclock_isa_read;
116 sc->sc_mcwrite = mcclock_isa_write;
117 sc->sc_getcent = NULL;
118 sc->sc_setcent = NULL;
119
120 /*
121 * Turn interrupts off, just in case. Need to leave the SQWE
122 * set, because that's the DRAM refresh signal on Rev. B boards.
123 */
124 mcclock_isa_write(sc, MC_REGB, MC_REGB_SQWE | MC_REGB_BINARY |
125 MC_REGB_24HR);
126
127 mc146818_attach(sc);
128
129 aprint_normal("\n");
130 }
131
132 static void
mcclock_isa_write(struct mc146818_softc * sc,u_int reg,u_int datum)133 mcclock_isa_write(struct mc146818_softc *sc, u_int reg, u_int datum)
134 {
135 bus_space_tag_t iot = sc->sc_bst;
136 bus_space_handle_t ioh = sc->sc_bsh;
137
138 bus_space_write_1(iot, ioh, 0, reg);
139 bus_space_write_1(iot, ioh, 1, datum);
140 }
141
142 static u_int
mcclock_isa_read(struct mc146818_softc * sc,u_int reg)143 mcclock_isa_read(struct mc146818_softc *sc, u_int reg)
144 {
145 bus_space_tag_t iot = sc->sc_bst;
146 bus_space_handle_t ioh = sc->sc_bsh;
147
148 bus_space_write_1(iot, ioh, 0, reg);
149 return bus_space_read_1(iot, ioh, 1);
150 }
151