85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/* $NetBSD: pl031.c,v 1.1 2017/06/08 21:00:43 jmcneill Exp $ */
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/*-
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* Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: pl031.c,v 1.1 2017/06/08 21:00:43 jmcneill Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/kmem.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/pl031var.h>
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#define RTCDR 0x000
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#define RTCLR 0x008
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#define RTCCR 0x00c
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#define RTCCR_START __BIT(0)
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#define RTC_READ(sc, reg) \
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bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
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#define RTC_WRITE(sc, reg, val) \
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bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
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static int
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plrtc_gettime(todr_chip_handle_t tch, struct timeval *tv)
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{
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struct plrtc_softc * const sc = tch->cookie;
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tv->tv_sec = RTC_READ(sc, RTCDR);
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tv->tv_usec = 0;
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return 0;
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}
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static int
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plrtc_settime(todr_chip_handle_t tch, struct timeval *tv)
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{
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struct plrtc_softc * const sc = tch->cookie;
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RTC_WRITE(sc, RTCLR, tv->tv_sec);
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return 0;
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}
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void
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plrtc_attach(struct plrtc_softc *sc)
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{
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aprint_naive("\n");
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aprint_normal(": RTC\n");
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sc->sc_todr.todr_gettime = plrtc_gettime;
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sc->sc_todr.todr_settime = plrtc_settime;
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sc->sc_todr.cookie = sc;
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RTC_WRITE(sc, RTCCR, RTCCR_START);
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}
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