201 lines
4.6 KiB
C
201 lines
4.6 KiB
C
/* $NetBSD: rs5c313_landisk.c,v 1.1 2006/09/07 01:55:03 uwe Exp $ */
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/*-
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: rs5c313_landisk.c,v 1.1 2006/09/07 01:55:03 uwe 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/kernel.h>
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#include <dev/clock_subr.h>
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#include <dev/ic/rs5c313var.h>
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#include <sh3/devreg.h>
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#include <sh3/scireg.h>
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#include <landisk/landisk/landiskreg.h>
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/* autoconf glue */
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static int rs5c313_landisk_match(struct device *, struct cfdata *, void *);
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static void rs5c313_landisk_attach(struct device *, struct device *, void *);
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CFATTACH_DECL(rs5c313_landisk, sizeof(struct rs5c313_softc),
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rs5c313_landisk_match, rs5c313_landisk_attach, NULL, NULL);
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/* chip access methods */
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static void rtc_begin(struct rs5c313_softc *);
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static void rtc_ce(struct rs5c313_softc *, int);
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static void rtc_dir(struct rs5c313_softc *, int);
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static void rtc_clk(struct rs5c313_softc *, int);
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static int rtc_read(struct rs5c313_softc *);
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static void rtc_write(struct rs5c313_softc *, int);
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struct rs5c313_ops rs5c313_landisk_ops = {
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.rs5c313_op_begin = rtc_begin,
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.rs5c313_op_ce = rtc_ce,
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.rs5c313_op_clk = rtc_clk,
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.rs5c313_op_dir = rtc_dir,
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.rs5c313_op_read = rtc_read,
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.rs5c313_op_write = rtc_write,
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};
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#define ndelay(x) delay(x)
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static int
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rs5c313_landisk_match(struct device *parent, struct cfdata *cf, void *aux)
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{
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static int matched = 0;
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if (matched)
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return 0;
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matched = 1;
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return 1;
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}
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static void
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rs5c313_landisk_attach(struct device *parent, struct device *self, void *aux)
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{
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struct rs5c313_softc *sc = (void *)self;
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sc->sc_ops = &rs5c313_landisk_ops;
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rs5c313_attach(sc);
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}
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static void
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rtc_begin(struct rs5c313_softc *sc)
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{
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SHREG_SCSPTR = SCSPTR_SPB1IO | SCSPTR_SPB1DT
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| SCSPTR_SPB0IO | SCSPTR_SPB0DT;
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ndelay(100);
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}
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/*
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* CE pin
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*/
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static void
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rtc_ce(struct rs5c313_softc *sc, int onoff)
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{
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if (onoff)
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_reg_write_1(LANDISK_PWRMNG, PWRMNG_RTC_CE);
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else
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_reg_write_1(LANDISK_PWRMNG, 0);
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ndelay(600);
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}
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/*
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* SCLK pin is connnected to SPB0DT.
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* SPB0DT is always in output mode, we set SPB0IO in rtc_begin.
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*/
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static void
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rtc_clk(struct rs5c313_softc *sc, int onoff)
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{
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uint8_t r = SHREG_SCSPTR;
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if (onoff)
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r |= SCSPTR_SPB0DT;
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else
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r &= ~SCSPTR_SPB0DT;
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SHREG_SCSPTR = r;
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}
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/*
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* SIO pin is connected to SPB1DT.
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* SPB1DT is output when SPB1IO is set.
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*/
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static void
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rtc_dir(struct rs5c313_softc *sc, int output)
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{
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uint8_t r = SHREG_SCSPTR;
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if (output)
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r |= SCSPTR_SPB1IO;
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else
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r &= ~SCSPTR_SPB1IO;
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SHREG_SCSPTR = r;
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}
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/*
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* Read bit from SPB1DT pin.
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*/
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static int
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rtc_read(struct rs5c313_softc *sc)
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{
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int bit;
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ndelay(300);
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bit = (SHREG_SCSPTR & SCSPTR_SPB1DT) ? 1 : 0;
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rtc_clk(sc, 0);
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ndelay(300);
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rtc_clk(sc, 1);
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return bit;
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}
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/*
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* Write bit via SPB1DT pin.
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*/
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static void
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rtc_write(struct rs5c313_softc *sc, int bit)
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{
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uint8_t r = SHREG_SCSPTR;
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if (bit)
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r |= SCSPTR_SPB1DT;
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else
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r &= ~SCSPTR_SPB1DT;
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SHREG_SCSPTR = r;
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ndelay(300);
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rtc_clk(sc, 0);
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ndelay(300);
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rtc_clk(sc, 1);
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}
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