1 /* $NetBSD: mcclock.c,v 1.4 2008/03/29 05:42:45 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 1.4 2008/03/29 05:42:45 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(device_t, cfdata_t, void *); 50 static void mcclock_attach(device_t, device_t, void *); 51 52 CFATTACH_DECL_NEW(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(device_t parent, cfdata_t cf, 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(device_t parent, device_t self, void *aux) 74 { 75 struct mc146818_softc *sc = device_private(self); 76 struct mainbus_attach_args *ma = aux; 77 78 sc->sc_dev = self; 79 sc->sc_bst = ma->ma_iot; 80 if (bus_space_map(sc->sc_bst, ma->ma_addr, MCCLOCK_NPORTS, 81 0, &sc->sc_bsh)) { 82 aprint_error("mcclock_attach: unable to map registers\n"); 83 return; 84 } 85 86 sc->sc_year0 = 2000; 87 sc->sc_mcread = mcclock_read; 88 sc->sc_mcwrite = mcclock_write; 89 sc->sc_flag = MC146818_BCD; 90 mc146818_attach(sc); 91 92 aprint_normal("\n"); 93 94 (*sc->sc_mcwrite)(sc, MC_REGB, MC_REGB_24HR); 95 } 96 97 static void 98 mcclock_write(struct mc146818_softc *sc, u_int reg, u_int datum) 99 { 100 bus_space_tag_t iot; 101 bus_space_handle_t ioh; 102 103 iot = sc->sc_bst; 104 ioh = sc->sc_bsh; 105 106 bus_space_write_1(iot, ioh, 0, reg); 107 bus_space_write_1(iot, ioh, 1, datum); 108 } 109 110 static u_int 111 mcclock_read(struct mc146818_softc *sc, u_int reg) 112 { 113 bus_space_tag_t iot; 114 bus_space_handle_t ioh; 115 u_int datum; 116 117 iot = sc->sc_bst; 118 ioh = sc->sc_bsh; 119 120 bus_space_write_1(iot, ioh, 0, reg); 121 datum = bus_space_read_1(iot, ioh, 1); 122 123 return datum; 124 } 125