e2e050c8ef
This allows replacing "sys/eventfilter.h" includes with "sys/_eventfilter.h"
in other header files (e.g., sys/{bus,conf,cpu}.h) and reduces header
pollution substantially.
EVENTHANDLER_DECLARE and EVENTHANDLER_LIST_DECLAREs were moved out of .c
files into appropriate headers (e.g., sys/proc.h, powernv/opal.h).
As a side effect of reduced header pollution, many .c files and headers no
longer contain needed definitions. The remainder of the patch addresses
adding appropriate includes to fix those files.
LOCK_DEBUG and LOCK_FILE_LINE_ARG are moved to sys/_lock.h, as required by
sys/mutex.h since r326106 (but silently protected by header pollution prior
to this change).
No functional change (intended). Of course, any out of tree modules that
relied on header pollution for sys/eventhandler.h, sys/lock.h, or
sys/mutex.h inclusion need to be fixed. __FreeBSD_version has been bumped.
265 lines
7.4 KiB
C
265 lines
7.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2012, 2013 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Oleksandr Rybalko under sponsorship
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* from the FreeBSD Foundation.
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, 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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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <sys/watchdog.h>
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#include <machine/bus.h>
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#include <machine/intr.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <arm/freescale/imx/imx_machdep.h>
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#include <arm/freescale/imx/imx_wdogreg.h>
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struct imx_wdog_softc {
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struct mtx sc_mtx;
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device_t sc_dev;
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struct resource *sc_res[2];
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void *sc_ih;
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uint32_t sc_timeout;
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bool sc_pde_enabled;
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};
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static struct resource_spec imx_wdog_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE },
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{ SYS_RES_IRQ, 0, RF_ACTIVE },
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RESOURCE_SPEC_END
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};
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#define MEMRES 0
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#define IRQRES 1
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static struct ofw_compat_data compat_data[] = {
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{"fsl,imx6sx-wdt", 1},
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{"fsl,imx6sl-wdt", 1},
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{"fsl,imx6q-wdt", 1},
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{"fsl,imx53-wdt", 1},
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{"fsl,imx51-wdt", 1},
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{"fsl,imx50-wdt", 1},
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{"fsl,imx35-wdt", 1},
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{"fsl,imx27-wdt", 1},
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{"fsl,imx25-wdt", 1},
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{"fsl,imx21-wdt", 1},
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{NULL, 0}
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};
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static inline uint16_t
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RD2(struct imx_wdog_softc *sc, bus_size_t offs)
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{
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return (bus_read_2(sc->sc_res[MEMRES], offs));
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}
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static inline void
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WR2(struct imx_wdog_softc *sc, bus_size_t offs, uint16_t val)
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{
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bus_write_2(sc->sc_res[MEMRES], offs, val);
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}
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static int
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imx_wdog_enable(struct imx_wdog_softc *sc, u_int timeout)
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{
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uint16_t reg;
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if (timeout < 1 || timeout > 128)
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return (EINVAL);
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mtx_lock(&sc->sc_mtx);
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if (timeout != sc->sc_timeout) {
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sc->sc_timeout = timeout;
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reg = RD2(sc, WDOG_CR_REG);
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reg &= ~WDOG_CR_WT_MASK;
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reg |= ((2 * timeout - 1) << WDOG_CR_WT_SHIFT);
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WR2(sc, WDOG_CR_REG, reg | WDOG_CR_WDE);
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}
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/* Refresh counter */
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WR2(sc, WDOG_SR_REG, WDOG_SR_STEP1);
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WR2(sc, WDOG_SR_REG, WDOG_SR_STEP2);
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/* Watchdog active, can disable rom-boot watchdog. */
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if (sc->sc_pde_enabled) {
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sc->sc_pde_enabled = false;
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reg = RD2(sc, WDOG_MCR_REG);
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WR2(sc, WDOG_MCR_REG, reg & ~WDOG_MCR_PDE);
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}
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mtx_unlock(&sc->sc_mtx);
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return (0);
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}
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static void
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imx_watchdog(void *arg, u_int cmd, int *error)
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{
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struct imx_wdog_softc *sc;
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u_int timeout;
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sc = arg;
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if (cmd == 0) {
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if (bootverbose)
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device_printf(sc->sc_dev, "Can not be disabled.\n");
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*error = EOPNOTSUPP;
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} else {
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timeout = (u_int)((1ULL << (cmd & WD_INTERVAL)) / 1000000000U);
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if (imx_wdog_enable(sc, timeout) == 0)
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*error = 0;
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}
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}
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static int
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imx_wdog_intr(void *arg)
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{
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struct imx_wdog_softc *sc = arg;
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/*
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* When configured for external reset, the actual reset is supposed to
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* happen when some external device responds to the assertion of the
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* WDOG_B signal by asserting the POR signal to the chip. This
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* interrupt handler is a backstop mechanism; it is set up to fire
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* simultaneously with WDOG_B, and if the external reset happens we'll
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* never actually make it to here. If we do make it here, just trigger
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* a software reset. That code will see that external reset is
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* configured, and it will wait for 1 second for it to take effect, then
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* it will do a software reset as a fallback.
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*/
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imx_wdog_cpu_reset(BUS_SPACE_PHYSADDR(sc->sc_res[MEMRES], WDOG_CR_REG));
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return (FILTER_HANDLED); /* unreached */
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}
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static int
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imx_wdog_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
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return (ENXIO);
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device_set_desc(dev, "Freescale i.MX Watchdog");
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return (0);
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}
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static int
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imx_wdog_attach(device_t dev)
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{
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struct imx_wdog_softc *sc;
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pcell_t timeout;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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if (bus_alloc_resources(dev, imx_wdog_spec, sc->sc_res)) {
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device_printf(dev, "could not allocate resources\n");
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return (ENXIO);
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}
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mtx_init(&sc->sc_mtx, device_get_nameunit(dev), "imx_wdt", MTX_DEF);
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/*
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* If we're configured to assert an external reset signal, set up the
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* hardware to do so, and install an interrupt handler whose only
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* purpose is to backstop the external reset. Don't worry if the
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* interrupt setup fails, since it's only a backstop measure.
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*/
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if (ofw_bus_has_prop(sc->sc_dev, "fsl,ext-reset-output")) {
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WR2(sc, WDOG_CR_REG, WDOG_CR_WDT | RD2(sc, WDOG_CR_REG));
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bus_setup_intr(sc->sc_dev, sc->sc_res[IRQRES],
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INTR_TYPE_MISC | INTR_MPSAFE, imx_wdog_intr, NULL, sc,
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&sc->sc_ih);
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WR2(sc, WDOG_ICR_REG, WDOG_ICR_WIE); /* Enable, count is 0. */
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}
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/*
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* Note whether the rom-boot so-called "power-down" watchdog is active,
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* so we can disable it when the regular watchdog is first enabled.
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*/
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if (RD2(sc, WDOG_MCR_REG) & WDOG_MCR_PDE)
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sc->sc_pde_enabled = true;
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EVENTHANDLER_REGISTER(watchdog_list, imx_watchdog, sc, 0);
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/* If there is a timeout-sec property, activate the watchdog. */
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if (OF_getencprop(ofw_bus_get_node(sc->sc_dev), "timeout-sec",
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&timeout, sizeof(timeout)) == sizeof(timeout)) {
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if (timeout < 1 || timeout > 128) {
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device_printf(sc->sc_dev, "ERROR: bad timeout-sec "
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"property value %u, using 128\n", timeout);
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timeout = 128;
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}
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imx_wdog_enable(sc, timeout);
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device_printf(sc->sc_dev, "watchdog enabled using "
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"timeout-sec property value %u\n", timeout);
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}
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/*
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* The watchdog hardware cannot be disabled, so there's little point in
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* coding up a detach() routine to carefully tear everything down, just
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* make the device busy so that detach can't happen.
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*/
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device_busy(sc->sc_dev);
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return (0);
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}
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static device_method_t imx_wdog_methods[] = {
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DEVMETHOD(device_probe, imx_wdog_probe),
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DEVMETHOD(device_attach, imx_wdog_attach),
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DEVMETHOD_END
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};
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static driver_t imx_wdog_driver = {
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"imx_wdog",
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imx_wdog_methods,
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sizeof(struct imx_wdog_softc),
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};
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static devclass_t imx_wdog_devclass;
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EARLY_DRIVER_MODULE(imx_wdog, simplebus, imx_wdog_driver,
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imx_wdog_devclass, 0, 0, BUS_PASS_TIMER);
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SIMPLEBUS_PNP_INFO(compat_data);
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