/* $NetBSD: tsrtc.c,v 1.8 2014/11/20 16:34:25 christos Exp $ */
/*
* Copyright (c) 1995, 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or
[email protected]
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tsrtc.c,v 1.8 2014/11/20 16:34:25 christos Exp $");
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/bus.h>
#include <dev/clock_subr.h>
#include <dev/ic/mc146818reg.h>
#include <dev/ic/mc146818var.h>
#include <evbarm/tsarm/tspldvar.h>
#include <evbarm/tsarm/tsarmreg.h>
int tsrtc_match(device_t, cfdata_t, void *);
void tsrtc_attach(device_t, device_t, void *);
struct tsrtc_softc {
struct mc146818_softc sc_mc;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_dath;
bus_space_handle_t sc_idxh;
};
CFATTACH_DECL_NEW(tsrtc, sizeof (struct tsrtc_softc),
tsrtc_match, tsrtc_attach, NULL, NULL);
void tsrtc_write(struct mc146818_softc *, u_int, u_int);
u_int tsrtc_read(struct mc146818_softc *, u_int);
int
tsrtc_match(device_t parent, cfdata_t cf, void *aux)
{
struct tspld_attach_args *aa = aux;
struct tsrtc_softc tsrtc, *tsc;
struct mc146818_softc *sc;
unsigned int t1, t2;
static int found = -1;
if (found != -1)
return found;
tsc = &tsrtc;
sc = &tsc->sc_mc;
tsc->sc_iot = aa->ta_iot;
if (bus_space_map(tsc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCIDX, 1, 0,
&tsc->sc_idxh))
return (0);
if (bus_space_map(tsc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCDAT, 1, 0,
&tsc->sc_dath))
return (0);
/* Read from the seconds counter. */
t1 = bcdtobin(tsrtc_read(sc, MC_SEC));
if (t1 > 59)
goto unmap;
/* Wait, then look again. */
DELAY(1100000);
t2 = bcdtobin(tsrtc_read(sc, MC_SEC));
if (t2 > 59)
goto unmap;
/* If [1,2) seconds have passed since, call it a clock. */
if ((t1 + 1) % 60 == t2 || (t1 + 2) % 60 == t2)
found = 1;
unmap:
bus_space_unmap(tsc->sc_iot, tsc->sc_idxh, 1);
bus_space_unmap(tsc->sc_iot, tsc->sc_dath, 1);
return (found);
}
void
tsrtc_attach(device_t parent, device_t self, void *aux)
{
struct tsrtc_softc *tsc = device_private(self);
struct mc146818_softc *sc = &tsc->sc_mc;
struct tspld_attach_args *aa = aux;
sc->sc_dev = self;
tsc->sc_iot = aa->ta_iot;
if (bus_space_map(tsc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCIDX,
1, 0, &tsc->sc_idxh))
panic("tsrtc_attach: couldn't map clock I/O space");
if (bus_space_map(tsc->sc_iot, TS7XXX_IO8_HWBASE + TS7XXX_RTCDAT,
1, 0, &tsc->sc_dath))
panic("tsrtc_attach: couldn't map clock I/O space");
sc->sc_year0 = 2000;
sc->sc_mcread = tsrtc_read;
sc->sc_mcwrite = tsrtc_write;
sc->sc_flag = MC146818_BCD;
mc146818_attach(sc);
aprint_normal("\n");
(*sc->sc_mcwrite)(sc, MC_REGB, MC_REGB_24HR);
}
void
tsrtc_write(struct mc146818_softc *mc_sc, u_int reg, u_int datum)
{
struct tsrtc_softc *sc = (struct tsrtc_softc *)mc_sc;
bus_space_write_1(sc->sc_iot, sc->sc_idxh, 0, reg);
bus_space_write_1(sc->sc_iot, sc->sc_dath, 0, datum);
}
u_int
tsrtc_read(struct mc146818_softc *mc_sc, u_int reg)
{
struct tsrtc_softc *sc = (struct tsrtc_softc *)mc_sc;
u_int datum;
bus_space_write_1(sc->sc_iot, sc->sc_idxh, 0, reg);
datum = bus_space_read_1(sc->sc_iot, sc->sc_dath, 0);
return (datum);
}
