1/*	$NetBSD: mcclock_isa.c,v 1.13 2011/07/01 18:46:35 dyoung 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 1.13 2011/07/01 18:46:35 dyoung 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
53static int	mcclock_isa_match(device_t, cfdata_t, void *);
54static void	mcclock_isa_attach(device_t, device_t, void *);
55
56CFATTACH_DECL_NEW(mcclock_isa, sizeof(struct mc146818_softc),
57    mcclock_isa_match, mcclock_isa_attach, NULL, NULL);
58
59static void	mcclock_isa_write(struct mc146818_softc *, u_int, u_int);
60static u_int	mcclock_isa_read(struct mc146818_softc *, u_int);
61
62static int
63mcclock_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
101static void
102mcclock_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
132static void
133mcclock_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
142static u_int
143mcclock_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