1 /* $NetBSD: mcclock.c,v 1.1 2006/04/15 13:33:05 tsutsui 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> 31 __KERNEL_RCSID(0, "$NetBSD: mcclock.c,v 1.1 2006/04/15 13:33:05 tsutsui Exp $"); 32 33 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 34 35 #include <sys/param.h> 36 #include <sys/kernel.h> 37 #include <sys/systm.h> 38 #include <sys/device.h> 39 40 #include <machine/autoconf.h> 41 #include <machine/bus.h> 42 43 #include <dev/clock_subr.h> 44 #include <dev/ic/mc146818reg.h> 45 #include <dev/ic/mc146818var.h> 46 47 #define MCCLOCK_NPORTS 2 48 49 static int mcclock_match(struct device *, struct cfdata *, void *); 50 static void mcclock_attach(struct device *, struct device *, void *); 51 52 CFATTACH_DECL(mcclock, sizeof (struct mc146818_softc), 53 mcclock_match, mcclock_attach, NULL, NULL); 54 55 static void mcclock_write(struct mc146818_softc *, u_int, u_int); 56 static u_int mcclock_read(struct mc146818_softc *, u_int); 57 58 59 static int 60 mcclock_match(struct device *parent, struct cfdata *match, void *aux) 61 { 62 static int mcclock_found; 63 64 if (mcclock_found) 65 return 0; 66 67 mcclock_found = 1; 68 69 return 1; 70 } 71 72 static void 73 mcclock_attach(struct device *parent, struct device *self, void *aux) 74 { 75 struct mc146818_softc *sc = (void *)self; 76 struct mainbus_attach_args *ma = aux; 77 78 sc->sc_bst = ma->ma_iot; 79 if (bus_space_map(sc->sc_bst, ma->ma_addr, MCCLOCK_NPORTS, 80 0, &sc->sc_bsh)) { 81 aprint_error("mcclock_attach: unable to map registers\n"); 82 return; 83 } 84 85 sc->sc_year0 = 2000; 86 sc->sc_mcread = mcclock_read; 87 sc->sc_mcwrite = mcclock_write; 88 sc->sc_flag = MC146818_BCD; 89 mc146818_attach(sc); 90 91 printf("\n"); 92 93 (*sc->sc_mcwrite)(sc, MC_REGB, MC_REGB_24HR); 94 95 todr_attach(&sc->sc_handle); 96 } 97 98 static void 99 mcclock_write(struct mc146818_softc *sc, u_int reg, u_int datum) 100 { 101 bus_space_tag_t iot; 102 bus_space_handle_t ioh; 103 104 iot = sc->sc_bst; 105 ioh = sc->sc_bsh; 106 107 bus_space_write_1(iot, ioh, 0, reg); 108 bus_space_write_1(iot, ioh, 1, datum); 109 } 110 111 static u_int 112 mcclock_read(struct mc146818_softc *sc, u_int reg) 113 { 114 bus_space_tag_t iot; 115 bus_space_handle_t ioh; 116 u_int datum; 117 118 iot = sc->sc_bst; 119 ioh = sc->sc_bsh; 120 121 bus_space_write_1(iot, ioh, 0, reg); 122 datum = bus_space_read_1(iot, ioh, 1); 123 124 return datum; 125 } 126