157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
/* $NetBSD: tsrtc.c,v 1.7 2011/07/01 19:11:34 dyoung 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 1.7 2011/07/01 19:11:34 dyoung 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 <sys/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(device_t, cfdata_t, void *);
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void tsrtc_attach(device_t, device_t, 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_NEW(tsrtc, sizeof (struct tsrtc_softc),
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tsrtc_match, tsrtc_attach, NULL, NULL);
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void tsrtc_write(struct mc146818_softc *, u_int, u_int);
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u_int tsrtc_read(struct mc146818_softc *, u_int);
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int
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tsrtc_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct tspld_attach_args *aa = aux;
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struct tsrtc_softc tsrtc, *tsc;
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struct mc146818_softc *sc;
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unsigned int t1, t2;
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static int found = -1;
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if (found != -1)
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return found;
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tsc = &tsrtc;
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sc = &tsc->sc_mc;
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tsc->sc_iot = aa->ta_iot;
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if (bus_space_map(tsc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCIDX, 1, 0,
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&tsc->sc_idxh))
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return (0);
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if (bus_space_map(tsc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCDAT, 1, 0,
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&tsc->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(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(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(tsc->sc_iot, tsc->sc_idxh, 1);
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bus_space_unmap(tsc->sc_iot, tsc->sc_dath, 1);
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return (found);
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}
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void
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tsrtc_attach(device_t parent, device_t self, void *aux)
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{
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struct tsrtc_softc *tsc = device_private(self);
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struct mc146818_softc *sc = &tsc->sc_mc;
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struct tspld_attach_args *aa = aux;
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sc->sc_dev = self;
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tsc->sc_iot = aa->ta_iot;
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if (bus_space_map(tsc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCIDX,
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1, 0, &tsc->sc_idxh))
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panic("tsrtc_attach: couldn't map clock I/O space");
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if (bus_space_map(tsc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCDAT,
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1, 0, &tsc->sc_dath))
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panic("tsrtc_attach: couldn't map clock I/O space");
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sc->sc_year0 = 2000;
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sc->sc_mcread = tsrtc_read;
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sc->sc_mcwrite = tsrtc_write;
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sc->sc_flag = MC146818_BCD;
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mc146818_attach(sc);
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aprint_normal("\n");
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(*sc->sc_mcwrite)(sc, MC_REGB, MC_REGB_24HR);
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}
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void
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tsrtc_write(struct mc146818_softc *mc_sc, u_int reg, u_int 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(struct mc146818_softc *mc_sc, 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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