276 lines
8.8 KiB
C
276 lines
8.8 KiB
C
/* $NetBSD: geodewdg.c,v 1.2 2006/06/07 22:37:59 kardel Exp $ */
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/*-
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* Copyright (c) 2005 David Young. All rights reserved.
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*
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* This code was written by David Young.
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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 David Young.
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* 4. The name of David Young may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID
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* YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* 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
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* OF SUCH DAMAGE.
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*/
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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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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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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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/*
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* Device driver for the watchdog timer built into the
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* AMD Geode SC1100 processor.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: geodewdg.c,v 1.2 2006/06/07 22:37:59 kardel 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/wdog.h>
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#include <uvm/uvm_extern.h>
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#include <machine/bus.h>
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#include <dev/pci/pcivar.h>
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#include <dev/pci/pcidevs.h>
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#include <arch/i386/pci/geodevar.h>
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#include <arch/i386/pci/geodereg.h>
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#include <dev/sysmon/sysmonvar.h>
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#ifdef GEODE_DEBUG
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#define GEODE_DPRINTF(__x) printf __x
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#else /* GEODE_DEBUG */
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#define GEODE_DPRINTF(__x) /* nothing */
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#endif
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struct geode_wdog_softc {
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struct device sc_dev;
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struct geode_gcb_softc *sc_gcb_dev;
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uint16_t sc_countdown;
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uint8_t sc_prescale;
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struct sysmon_wdog sc_smw;
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};
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static int attached = 0;
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static void
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geode_wdog_disable(struct geode_wdog_softc *sc)
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{
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uint16_t wdcnfg;
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/* cancel any pending countdown */
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sc->sc_countdown = 0;
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bus_space_write_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDTO, 0);
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/* power-down clock */
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wdcnfg = bus_space_read_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh,
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SC1100_GCB_WDCNFG);
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GEODE_DPRINTF(("%s: wdcnfg %#04" PRIx16 " -> ", __func__, wdcnfg));
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wdcnfg |= SC1100_WDCNFG_WD32KPD;
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wdcnfg &= ~(SC1100_WDCNFG_WDTYPE2_MASK | SC1100_WDCNFG_WDTYPE1_MASK);
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/* This no-op is for the reader's benefit. */
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wdcnfg |= SC1100_WDCNFG_WDTYPE1_NOACTION |
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SC1100_WDCNFG_WDTYPE2_NOACTION;
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bus_space_write_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDCNFG, wdcnfg);
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GEODE_DPRINTF(("%#04" PRIx16 "\n", wdcnfg));
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}
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static void
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geode_wdog_enable(struct geode_wdog_softc *sc)
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{
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uint16_t wdcnfg;
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/* power-up clock and set prescale */
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wdcnfg = bus_space_read_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDCNFG);
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GEODE_DPRINTF(("%s: wdcnfg %#04" PRIx16 " -> ", __func__, wdcnfg));
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wdcnfg &= ~(SC1100_WDCNFG_WD32KPD | SC1100_WDCNFG_WDPRES_MASK |
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SC1100_WDCNFG_WDTYPE1_MASK | SC1100_WDCNFG_WDTYPE2_MASK);
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wdcnfg |= SHIFTIN(sc->sc_prescale, SC1100_WDCNFG_WDPRES_MASK);
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wdcnfg |= SC1100_WDCNFG_WDTYPE1_RESET | SC1100_WDCNFG_WDTYPE2_NOACTION;
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bus_space_write_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDCNFG, wdcnfg);
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GEODE_DPRINTF(("%#04" PRIx16 "\n", wdcnfg));
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}
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static void
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geode_wdog_reset(struct geode_wdog_softc *sc)
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{
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/* set countdown */
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bus_space_write_2(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDTO,
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sc->sc_countdown);
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}
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static int
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geode_wdog_tickle(struct sysmon_wdog *smw)
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{
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int s;
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struct geode_wdog_softc *sc = smw->smw_cookie;
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s = splhigh();
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geode_wdog_reset(sc);
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splx(s);
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return 0;
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}
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static int
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geode_wdog_setmode(struct sysmon_wdog *smw)
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{
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struct geode_wdog_softc *sc = smw->smw_cookie;
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uint32_t ticks;
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int prescale, s;
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if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
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s = splhigh();
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geode_wdog_disable(sc);
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splx(s);
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return 0;
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}
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if (smw->smw_period == WDOG_PERIOD_DEFAULT)
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smw->smw_period = 32;
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else if (smw->smw_period > SC1100_WDIVL_MAX) /* too big? */
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return EINVAL;
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GEODE_DPRINTF(("%s: period %u\n", __func__, smw->smw_period));
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ticks = smw->smw_period * SC1100_WDCLK_HZ;
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GEODE_DPRINTF(("%s: ticks0 %" PRIu32 "\n", __func__, ticks));
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for (prescale = 0; ticks > UINT16_MAX; prescale++)
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ticks /= 2;
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GEODE_DPRINTF(("%s: ticks %" PRIu32 "\n", __func__, ticks));
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GEODE_DPRINTF(("%s: prescale %d\n", __func__, prescale));
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KASSERT(prescale <= SC1100_WDCNFG_WDPRES_MAX);
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KASSERT(ticks <= UINT16_MAX);
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s = splhigh();
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sc->sc_prescale = (uint8_t)prescale;
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sc->sc_countdown = (uint16_t)ticks;
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geode_wdog_enable(sc);
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geode_wdog_reset(sc);
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splx(s);
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return 0;
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}
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static int
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geode_wdog_match(struct device *parent, struct cfdata *match, void *aux)
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{
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return !attached;
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}
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static void
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geode_wdog_attach(struct device *parent, struct device *self, void *aux)
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{
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struct geode_wdog_softc *sc = (void *) self;
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uint8_t wdsts;
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aprint_naive(": Watchdog Timer\n");
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aprint_normal(": AMD Geode SC1100 Watchdog Timer\n");
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/*
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* Hook up the watchdog timer.
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*/
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sc->sc_gcb_dev = (struct geode_gcb_softc *)parent;
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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 = geode_wdog_setmode;
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sc->sc_smw.smw_tickle = geode_wdog_tickle;
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sc->sc_smw.smw_period = 32;
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/*
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* Determine cause of the last reset, and issue a warning if it
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* was due to watchdog expiry.
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*/
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wdsts = bus_space_read_1(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDSTS);
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GEODE_DPRINTF(("%s: status %#02" PRIx8 "\n", sc->sc_dev.dv_xname,
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wdsts));
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if (wdsts & SC1100_WDSTS_WDRST)
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aprint_error(
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"%s: WARNING: LAST RESET DUE TO WATCHDOG EXPIRATION!\n",
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sc->sc_dev.dv_xname);
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/* reset WDOVF by writing 1 to it */
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bus_space_write_1(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_WDSTS,
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wdsts & SC1100_WDSTS_WDOVF);
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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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/* cancel any pending countdown */
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geode_wdog_disable(sc);
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attached = 1;
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}
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CFATTACH_DECL(geodewdog, sizeof(struct geode_wdog_softc),
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geode_wdog_match, geode_wdog_attach, NULL, NULL);
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