Support the IXP425 watchdog timer.
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scw
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@ -1,4 +1,4 @@
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# $NetBSD: files.ixp425,v 1.10 2006/12/10 10:01:49 scw Exp $
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# $NetBSD: files.ixp425,v 1.11 2006/12/10 10:03:22 scw Exp $
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#
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# Configuration info for Intel IXP4xx CPU support
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#
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@ -30,6 +30,11 @@ device ixpclk
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attach ixpclk at ixpsip
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file arch/arm/xscale/ixp425_timer.c ixpclk needs-flag
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# watchdog device
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device ixpdog: sysmon_wdog
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attach ixpdog at ixpsip
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file arch/arm/xscale/ixp425_wdog.c ixpdog
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# Serial port
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# Note: Can't call this 'ixpcom' as that clashes with another arm device.
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attach com at ixpsip with ixsipcom
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223
sys/arch/arm/xscale/ixp425_wdog.c
Normal file
223
sys/arch/arm/xscale/ixp425_wdog.c
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@ -0,0 +1,223 @@
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/* $NetBSD: ixp425_wdog.c,v 1.1 2006/12/10 10:03:22 scw Exp $ */
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/*-
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* Copyright (c) 2006 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Steve C. Woodford.
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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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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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 "opt_ddb.h"
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ixp425_wdog.c,v 1.1 2006/12/10 10:03:22 scw Exp $");
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#include <sys/systm.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/wdog.h>
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#include <dev/clock_subr.h>
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#include <dev/sysmon/sysmonvar.h>
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#include <machine/intr.h>
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#include <machine/bus.h>
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#include <arm/xscale/ixp425reg.h>
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#include <arm/xscale/ixp425var.h>
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#include <arm/xscale/ixp425_sipvar.h>
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#ifdef DDB
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#include <machine/db_machdep.h>
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#include <ddb/db_extern.h>
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#endif
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struct ixpdog_softc {
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struct device sc_dev;
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struct sysmon_wdog sc_smw;
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bus_space_tag_t sc_bust;
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bus_space_handle_t sc_bush;
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uint32_t sc_preset;
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int sc_armed;
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};
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#define IXPDOG_DEFAULT_PERIOD 8
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#ifndef IXP425_CLOCK_FREQ
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#define IXPDOG_COUNTS_PER_SEC 66666600
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#else
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#define IXPDOG_COUNTS_PER_SEC IXP425_CLOCK_FREQ
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#endif
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static int ixpdog_match(struct device *, struct cfdata *, void *);
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static void ixpdog_attach(struct device *, struct device *, void *);
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CFATTACH_DECL(ixpdog, sizeof(struct ixpdog_softc),
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ixpdog_match, ixpdog_attach, NULL, NULL);
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static void ixpdog_control(struct ixpdog_softc *, int);
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static int ixpdog_tickle(struct sysmon_wdog *);
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static int ixpdog_setmode(struct sysmon_wdog *);
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#ifdef DDB
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static struct ixpdog_softc *ixpdog_softc;
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static void ixpdog_ddb_trap(int);
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#endif
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static int
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ixpdog_match(struct device *parent, struct cfdata *match, void *arg)
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{
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struct ixpsip_attach_args *sa = arg;
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return (sa->sa_addr == IXP425_OST_WDOG_HWBASE);
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}
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static void
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ixpdog_attach(struct device *parent, struct device *self, void *arg)
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{
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struct ixpdog_softc *sc = (struct ixpdog_softc *)self;
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struct ixpsip_attach_args *sa = arg;
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aprint_naive("\n");
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aprint_normal(": Watchdog Timer\n");
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sc->sc_bust = sa->sa_iot;
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if (bus_space_map(sc->sc_bust, sa->sa_addr, IXP425_OST_WDOG_SIZE, 0,
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&sc->sc_bush)) {
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aprint_error("%s: Failed to map watchdog registers\n",
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sc->sc_dev.dv_xname);
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return;
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}
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sc->sc_preset = IXPDOG_COUNTS_PER_SEC * hz * IXPDOG_DEFAULT_PERIOD;
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sc->sc_armed = 0;
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ixpdog_control(sc, 0);
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#ifdef DDB
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ixpdog_softc = sc;
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db_trap_callback = ixpdog_ddb_trap;
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#endif
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sc->sc_smw.smw_name = sc->sc_dev.dv_xname;
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sc->sc_smw.smw_cookie = sc;
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sc->sc_smw.smw_setmode = ixpdog_setmode;
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sc->sc_smw.smw_tickle = ixpdog_tickle;
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sc->sc_smw.smw_period = IXPDOG_DEFAULT_PERIOD;
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if (sysmon_wdog_register(&sc->sc_smw) != 0)
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aprint_error("%s: unable to register watchdog with sysmon\n",
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sc->sc_dev.dv_xname);
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}
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static void
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ixpdog_control(struct ixpdog_softc *sc, int enable)
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{
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uint32_t reg;
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int s;
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s = disable_interrupts(I32_bit);
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bus_space_write_2(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_KEY,
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OST_WDOG_KEY_MAJICK);
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reg = bus_space_read_4(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_ENAB);
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if (!enable)
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reg &= ~(OST_WDOG_ENAB_CNT_ENA | OST_WDOG_ENAB_RST_ENA);
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else {
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bus_space_write_4(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG,
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sc->sc_preset);
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reg |= OST_WDOG_ENAB_CNT_ENA | OST_WDOG_ENAB_RST_ENA;
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}
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bus_space_write_4(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_ENAB, reg);
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bus_space_write_2(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_KEY,
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~OST_WDOG_KEY_MAJICK);
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restore_interrupts(s);
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}
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static int
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ixpdog_tickle(struct sysmon_wdog *smw)
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{
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struct ixpdog_softc *sc = smw->smw_cookie;
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int s;
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s = disable_interrupts(I32_bit);
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bus_space_write_2(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_KEY,
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OST_WDOG_KEY_MAJICK);
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bus_space_write_4(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG,
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sc->sc_preset);
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bus_space_write_2(sc->sc_bust, sc->sc_bush, IXP425_OST_WDOG_KEY,
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~OST_WDOG_KEY_MAJICK);
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restore_interrupts(s);
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return (0);
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}
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static int
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ixpdog_setmode(struct sysmon_wdog *smw)
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{
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struct ixpdog_softc *sc = smw->smw_cookie;
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if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED)
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sc->sc_armed = 0;
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else {
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if (smw->smw_period == WDOG_PERIOD_DEFAULT)
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smw->smw_period = IXPDOG_DEFAULT_PERIOD;
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sc->sc_preset = IXPDOG_COUNTS_PER_SEC * hz * smw->smw_period;
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if (sc->sc_preset < (IXPDOG_COUNTS_PER_SEC * hz) ||
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sc->sc_preset < smw->smw_period)
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return (EOPNOTSUPP);
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sc->sc_armed = 1;
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}
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ixpdog_control(sc, sc->sc_armed);
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return (0);
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}
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#ifdef DDB
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static void
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ixpdog_ddb_trap(int enter)
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{
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struct ixpdog_softc *sc;
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if ((sc = ixpdog_softc) == NULL)
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return;
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sc->sc_armed += enter ? (-1) : 1;
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if ((enter && sc->sc_armed == 0) || (!enter && sc->sc_armed == 1))
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ixpdog_control(sc, sc->sc_armed);
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}
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#endif
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