164 lines
4.3 KiB
C
164 lines
4.3 KiB
C
/* $NetBSD: tsrtc.c,v 1.2 2005/12/11 12:17:11 christos Exp $ */
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/*
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* Copyright (c) 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: tsrtc.c,v 1.2 2005/12/11 12:17:11 christos Exp $");
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <machine/bus.h>
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#include <dev/clock_subr.h>
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#include <dev/ic/mc146818reg.h>
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#include <dev/ic/mc146818var.h>
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#include <evbarm/tsarm/tspldvar.h>
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#include <evbarm/tsarm/tsarmreg.h>
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int tsrtc_match __P((struct device *, struct cfdata *, void *));
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void tsrtc_attach __P((struct device *, struct device *, void *));
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struct tsrtc_softc {
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struct mc146818_softc sc_mc;
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bus_space_tag_t sc_iot;
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bus_space_handle_t sc_dath;
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bus_space_handle_t sc_idxh;
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};
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CFATTACH_DECL(tsrtc, sizeof (struct tsrtc_softc),
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tsrtc_match, tsrtc_attach, NULL, NULL);
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void tsrtc_write __P((struct mc146818_softc *, u_int, u_int));
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u_int tsrtc_read __P((struct mc146818_softc *, u_int));
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int
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tsrtc_match(parent, match, aux)
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struct device *parent;
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struct cfdata *match;
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void *aux;
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{
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struct tspld_attach_args *aa = aux;
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struct tsrtc_softc tsrtc, *sc;
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unsigned int t1, t2;
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static int found = -1;
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if (found != -1) return found;
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sc = &tsrtc;
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sc->sc_iot = aa->ta_iot;
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if (bus_space_map(sc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCIDX, 1, 0,
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&sc->sc_idxh))
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return (0);
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if (bus_space_map(sc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCDAT, 1, 0,
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&sc->sc_dath))
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return (0);
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/* Read from the seconds counter. */
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t1 = FROMBCD(tsrtc_read((struct mc146818_softc *)sc, MC_SEC));
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if (t1 > 59)
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goto unmap;
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/* Wait, then look again. */
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DELAY(1100000);
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t2 = FROMBCD(tsrtc_read((struct mc146818_softc *)sc, MC_SEC));
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if (t2 > 59)
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goto unmap;
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/* If [1,2) seconds have passed since, call it a clock. */
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if ((t1 + 1) % 60 == t2 || (t1 + 2) % 60 == t2)
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found = 1;
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unmap:
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bus_space_unmap(sc->sc_iot, sc->sc_idxh, 1);
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bus_space_unmap(sc->sc_iot, sc->sc_dath, 1);
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return (found);
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}
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void
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tsrtc_attach(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct tsrtc_softc *sc = (void *)self;
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struct tspld_attach_args *aa = aux;
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sc->sc_iot = aa->ta_iot;
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if (bus_space_map(sc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCIDX,
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1, 0, &sc->sc_idxh))
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panic("tsrtc_attach: couldn't map clock I/O space");
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if (bus_space_map(sc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCDAT,
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1, 0, &sc->sc_dath))
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panic("tsrtc_attach: couldn't map clock I/O space");
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sc->sc_mc.sc_year0 = 2000;
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sc->sc_mc.sc_mcread = tsrtc_read;
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sc->sc_mc.sc_mcwrite = tsrtc_write;
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sc->sc_mc.sc_flag = MC146818_BCD;
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mc146818_attach(&sc->sc_mc);
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printf("\n");
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(*sc->sc_mc.sc_mcwrite)((struct mc146818_softc *)sc, MC_REGB,
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MC_REGB_24HR);
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todr_attach(&sc->sc_mc.sc_handle);
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}
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void
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tsrtc_write(mc_sc, reg, datum)
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struct mc146818_softc *mc_sc;
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u_int reg, datum;
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{
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struct tsrtc_softc *sc = (struct tsrtc_softc *)mc_sc;
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bus_space_write_1(sc->sc_iot, sc->sc_idxh, 0, reg);
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bus_space_write_1(sc->sc_iot, sc->sc_dath, 0, datum);
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}
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u_int
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tsrtc_read(mc_sc, reg)
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struct mc146818_softc *mc_sc;
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u_int reg;
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{
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struct tsrtc_softc *sc = (struct tsrtc_softc *)mc_sc;
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u_int datum;
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bus_space_write_1(sc->sc_iot, sc->sc_idxh, 0, reg);
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datum = bus_space_read_1(sc->sc_iot, sc->sc_dath, 0);
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return (datum);
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}
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