187 lines
5.2 KiB
C
187 lines
5.2 KiB
C
/* $NetBSD: bcm2835_pm.c,v 1.3 2013/04/14 15:11:52 skrll Exp $ */
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/*-
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* Copyright (c) 2012 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 Nick Hudson
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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 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: bcm2835_pm.c,v 1.3 2013/04/14 15:11:52 skrll 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 <sys/timetc.h>
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#include <sys/wdog.h>
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#include <sys/bus.h>
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#include <dev/sysmon/sysmonvar.h>
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#include <arm/broadcom/bcm_amba.h>
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#include <arm/broadcom/bcm2835reg.h>
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#include <arm/broadcom/bcm2835_intr.h>
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#include <arm/broadcom/bcm2835_pmvar.h>
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#ifndef BCM2835_PM_DEFAULT_PERIOD
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#define BCM2835_PM_DEFAULT_PERIOD 15 /* seconds */
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#endif
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#define BCM2835_PM_PASSWORD 0x5a000000
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#define BCM2835_PM_RSTC 0x1c
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#define BCM2835_PM_RSTC_CONFIGMASK 0x00000030
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#define BCM2835_PM_RSTC_FULL_RESET 0x00000020
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#define BCM2835_PM_RSTC_RESET 0x00000102
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#define BCM2835_PM_WDOG 0x24
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#define BCM2835_PM_WDOG_TIMEMASK 0x000fffff
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struct bcm2835pm_softc {
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device_t sc_dev;
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bus_space_tag_t sc_iot;
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bus_space_handle_t sc_ioh;
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struct sysmon_wdog sc_smw;
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};
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static struct bcm2835pm_softc *bcm2835pm_sc;
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static int bcmpm_match(device_t, cfdata_t, void *);
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static void bcmpm_attach(device_t, device_t, void *);
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static void bcmpm_wdog_set_timeout(struct bcm2835pm_softc *, uint32_t);
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static int bcmpm_wdog_setmode(struct sysmon_wdog *);
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static int bcmpm_wdog_tickle(struct sysmon_wdog *);
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CFATTACH_DECL_NEW(bcmpm_amba, sizeof(struct bcm2835pm_softc),
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bcmpm_match, bcmpm_attach, NULL, NULL);
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/* ARGSUSED */
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static int
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bcmpm_match(device_t parent, cfdata_t match, void *aux)
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{
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struct amba_attach_args *aaa = aux;
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if (strcmp(aaa->aaa_name, "bcmpm") != 0)
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return 0;
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return 1;
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}
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static void
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bcmpm_attach(device_t parent, device_t self, void *aux)
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{
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struct bcm2835pm_softc *sc = device_private(self);
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struct amba_attach_args *aaa = aux;
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aprint_naive("\n");
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aprint_normal(": Power management, Reset and Watchdog controller\n");
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if (bcm2835pm_sc == NULL)
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bcm2835pm_sc = sc;
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sc->sc_dev = self;
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sc->sc_iot = aaa->aaa_iot;
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if (bus_space_map(aaa->aaa_iot, aaa->aaa_addr, BCM2835_PM_SIZE, 0,
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&sc->sc_ioh)) {
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aprint_error_dev(sc->sc_dev, "unable to map device\n");
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return;
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}
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/* watchdog */
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sc->sc_smw.smw_name = device_xname(sc->sc_dev);
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sc->sc_smw.smw_cookie = sc;
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sc->sc_smw.smw_setmode = bcmpm_wdog_setmode;
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sc->sc_smw.smw_tickle = bcmpm_wdog_tickle;
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sc->sc_smw.smw_period = BCM2835_PM_DEFAULT_PERIOD;
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if (sysmon_wdog_register(&sc->sc_smw) != 0)
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aprint_error_dev(self, "couldn't register watchdog\n");
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}
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static void
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bcmpm_wdog_set_timeout(struct bcm2835pm_softc *sc, uint32_t ticks)
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{
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uint32_t tmp, rstc, wdog;
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tmp = bus_space_read_4(sc->sc_iot, sc->sc_ioh, BCM2835_PM_RSTC);
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rstc = wdog = BCM2835_PM_PASSWORD;
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rstc |= tmp & ~BCM2835_PM_RSTC_CONFIGMASK;
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rstc |= BCM2835_PM_RSTC_FULL_RESET;
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wdog |= ticks & BCM2835_PM_WDOG_TIMEMASK;
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bus_space_write_4(sc->sc_iot, sc->sc_ioh, BCM2835_PM_WDOG, wdog);
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bus_space_write_4(sc->sc_iot, sc->sc_ioh, BCM2835_PM_RSTC, rstc);
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}
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static int
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bcmpm_wdog_setmode(struct sysmon_wdog *smw)
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{
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struct bcm2835pm_softc *sc = smw->smw_cookie;
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int error = 0;
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if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
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bus_space_write_4(sc->sc_iot, sc->sc_ioh, BCM2835_PM_RSTC,
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BCM2835_PM_PASSWORD | BCM2835_PM_RSTC_RESET);
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} else {
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if (smw->smw_period == WDOG_PERIOD_DEFAULT)
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smw->smw_period = BCM2835_PM_DEFAULT_PERIOD;
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if (smw->smw_period > (BCM2835_PM_WDOG_TIMEMASK >> 16))
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return EINVAL;
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error = bcmpm_wdog_tickle(smw);
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}
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return error;
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}
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static int
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bcmpm_wdog_tickle(struct sysmon_wdog *smw)
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{
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struct bcm2835pm_softc *sc = smw->smw_cookie;
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uint32_t timeout = smw->smw_period << 16;
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bcmpm_wdog_set_timeout(sc, timeout);
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return 0;
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}
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void
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bcm2835_system_reset(void)
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{
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struct bcm2835pm_softc *sc = bcm2835pm_sc;
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uint32_t timeout = 10;
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bcmpm_wdog_set_timeout(sc, timeout);
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}
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