1 /* $NetBSD: tsrtc.c,v 1.2 2005/12/11 12:17:11 christos 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: tsrtc.c,v 1.2 2005/12/11 12:17:11 christos 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/bus.h> 41 42 #include <dev/clock_subr.h> 43 #include <dev/ic/mc146818reg.h> 44 #include <dev/ic/mc146818var.h> 45 46 #include <evbarm/tsarm/tspldvar.h> 47 #include <evbarm/tsarm/tsarmreg.h> 48 49 int tsrtc_match __P((struct device *, struct cfdata *, void *)); 50 void tsrtc_attach __P((struct device *, struct device *, void *)); 51 52 struct tsrtc_softc { 53 struct mc146818_softc sc_mc; 54 bus_space_tag_t sc_iot; 55 bus_space_handle_t sc_dath; 56 bus_space_handle_t sc_idxh; 57 }; 58 59 CFATTACH_DECL(tsrtc, sizeof (struct tsrtc_softc), 60 tsrtc_match, tsrtc_attach, NULL, NULL); 61 62 void tsrtc_write __P((struct mc146818_softc *, u_int, u_int)); 63 u_int tsrtc_read __P((struct mc146818_softc *, u_int)); 64 65 66 int 67 tsrtc_match(parent, match, aux) 68 struct device *parent; 69 struct cfdata *match; 70 void *aux; 71 { 72 struct tspld_attach_args *aa = aux; 73 struct tsrtc_softc tsrtc, *sc; 74 unsigned int t1, t2; 75 static int found = -1; 76 77 if (found != -1) return found; 78 79 sc = &tsrtc; 80 sc->sc_iot = aa->ta_iot; 81 if (bus_space_map(sc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCIDX, 1, 0, 82 &sc->sc_idxh)) 83 return (0); 84 if (bus_space_map(sc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCDAT, 1, 0, 85 &sc->sc_dath)) 86 return (0); 87 88 /* Read from the seconds counter. */ 89 t1 = FROMBCD(tsrtc_read((struct mc146818_softc *)sc, MC_SEC)); 90 if (t1 > 59) 91 goto unmap; 92 93 /* Wait, then look again. */ 94 DELAY(1100000); 95 t2 = FROMBCD(tsrtc_read((struct mc146818_softc *)sc, MC_SEC)); 96 if (t2 > 59) 97 goto unmap; 98 99 /* If [1,2) seconds have passed since, call it a clock. */ 100 if ((t1 + 1) % 60 == t2 || (t1 + 2) % 60 == t2) 101 found = 1; 102 103 unmap: 104 bus_space_unmap(sc->sc_iot, sc->sc_idxh, 1); 105 bus_space_unmap(sc->sc_iot, sc->sc_dath, 1); 106 107 return (found); 108 } 109 110 void 111 tsrtc_attach(parent, self, aux) 112 struct device *parent, *self; 113 void *aux; 114 { 115 struct tsrtc_softc *sc = (void *)self; 116 struct tspld_attach_args *aa = aux; 117 118 sc->sc_iot = aa->ta_iot; 119 if (bus_space_map(sc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCIDX, 120 1, 0, &sc->sc_idxh)) 121 panic("tsrtc_attach: couldn't map clock I/O space"); 122 if (bus_space_map(sc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCDAT, 123 1, 0, &sc->sc_dath)) 124 panic("tsrtc_attach: couldn't map clock I/O space"); 125 126 sc->sc_mc.sc_year0 = 2000; 127 sc->sc_mc.sc_mcread = tsrtc_read; 128 sc->sc_mc.sc_mcwrite = tsrtc_write; 129 sc->sc_mc.sc_flag = MC146818_BCD; 130 mc146818_attach(&sc->sc_mc); 131 132 printf("\n"); 133 134 (*sc->sc_mc.sc_mcwrite)((struct mc146818_softc *)sc, MC_REGB, 135 MC_REGB_24HR); 136 137 todr_attach(&sc->sc_mc.sc_handle); 138 } 139 140 void 141 tsrtc_write(mc_sc, reg, datum) 142 struct mc146818_softc *mc_sc; 143 u_int reg, datum; 144 { 145 struct tsrtc_softc *sc = (struct tsrtc_softc *)mc_sc; 146 147 bus_space_write_1(sc->sc_iot, sc->sc_idxh, 0, reg); 148 bus_space_write_1(sc->sc_iot, sc->sc_dath, 0, datum); 149 } 150 151 u_int 152 tsrtc_read(mc_sc, reg) 153 struct mc146818_softc *mc_sc; 154 u_int reg; 155 { 156 struct tsrtc_softc *sc = (struct tsrtc_softc *)mc_sc; 157 u_int datum; 158 159 bus_space_write_1(sc->sc_iot, sc->sc_idxh, 0, reg); 160 datum = bus_space_read_1(sc->sc_iot, sc->sc_dath, 0); 161 162 return (datum); 163 } 164