261 lines
6.7 KiB
C
261 lines
6.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2012 Alexander Rybalko <ray@freebsd.org>
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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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*
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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/reboot.h>
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#include <sys/rman.h>
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#include <sys/systm.h>
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#include <sys/watchdog.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 <machine/bus.h>
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#include <machine/machdep.h>
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#include <arm/broadcom/bcm2835/bcm2835_wdog.h>
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#define BCM2835_PASSWORD 0x5a
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#define BCM2835_WDOG_RESET 0
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#define BCM2835_PASSWORD_MASK 0xff000000
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#define BCM2835_PASSWORD_SHIFT 24
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#define BCM2835_WDOG_TIME_MASK 0x000fffff
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#define BCM2835_WDOG_TIME_SHIFT 0
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#define READ(_sc, _r) bus_space_read_4((_sc)->bst, (_sc)->bsh, (_r) + (_sc)->regs_offset)
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#define WRITE(_sc, _r, _v) bus_space_write_4((_sc)->bst, (_sc)->bsh, (_r) + (_sc)->regs_offset, (_v))
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#define BCM2835_RSTC_WRCFG_CLR 0xffffffcf
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#define BCM2835_RSTC_WRCFG_SET 0x00000030
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#define BCM2835_RSTC_WRCFG_FULL_RESET 0x00000020
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#define BCM2835_RSTC_RESET 0x00000102
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#define BCM2835_RSTC_REG 0x00
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#define BCM2835_RSTS_REG 0x04
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#define BCM2835_WDOG_REG 0x08
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static struct bcmwd_softc *bcmwd_lsc = NULL;
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struct bcmwd_softc {
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device_t dev;
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struct resource * res;
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bus_space_tag_t bst;
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bus_space_handle_t bsh;
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int wdog_armed;
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int wdog_period;
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char wdog_passwd;
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struct mtx mtx;
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int regs_offset;
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};
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#define BSD_DTB 1
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#define UPSTREAM_DTB 2
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#define UPSTREAM_DTB_REGS_OFFSET 0x1c
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static struct ofw_compat_data compat_data[] = {
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{"broadcom,bcm2835-wdt", BSD_DTB},
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{"brcm,bcm2835-pm-wdt", UPSTREAM_DTB},
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{"brcm,bcm2835-pm", UPSTREAM_DTB},
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{NULL, 0}
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};
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static void bcmwd_watchdog_fn(void *private, u_int cmd, int *error);
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static void bcmwd_reboot_system(void *, int);
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static int
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bcmwd_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, "BCM2708/2835 Watchdog");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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bcmwd_attach(device_t dev)
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{
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struct bcmwd_softc *sc;
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int rid;
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if (bcmwd_lsc != NULL)
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return (ENXIO);
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sc = device_get_softc(dev);
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sc->wdog_period = 7;
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sc->wdog_passwd = BCM2835_PASSWORD;
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sc->wdog_armed = 0;
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sc->dev = dev;
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rid = 0;
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sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
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if (sc->res == NULL) {
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device_printf(dev, "could not allocate memory resource\n");
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return (ENXIO);
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}
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sc->bst = rman_get_bustag(sc->res);
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sc->bsh = rman_get_bushandle(sc->res);
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/* compensate base address difference */
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data
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== UPSTREAM_DTB)
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sc->regs_offset = UPSTREAM_DTB_REGS_OFFSET;
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bcmwd_lsc = sc;
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mtx_init(&sc->mtx, "BCM2835 Watchdog", "bcmwd", MTX_DEF);
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EVENTHANDLER_REGISTER(watchdog_list, bcmwd_watchdog_fn, sc, 0);
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/*
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* Handle reboot events. This needs to happen with slightly greater
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* priority than the PSCI handler, since PSCI reset is not properly
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* implemented on the Pi and it just puts the Pi into a halt
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* state.
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*/
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EVENTHANDLER_REGISTER(shutdown_final, bcmwd_reboot_system, sc,
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SHUTDOWN_PRI_LAST-1);
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return (0);
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}
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static void
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bcmwd_watchdog_fn(void *private, u_int cmd, int *error)
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{
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struct bcmwd_softc *sc;
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uint64_t sec;
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uint32_t ticks, reg;
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sc = private;
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mtx_lock(&sc->mtx);
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cmd &= WD_INTERVAL;
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if (cmd > 0) {
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sec = ((uint64_t)1 << (cmd & WD_INTERVAL)) / 1000000000;
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if (sec == 0 || sec > 15) {
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/*
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* Can't arm
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* disable watchdog as watchdog(9) requires
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*/
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device_printf(sc->dev,
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"Can't arm, timeout must be between 1-15 seconds\n");
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WRITE(sc, BCM2835_RSTC_REG,
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(BCM2835_PASSWORD << BCM2835_PASSWORD_SHIFT) |
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BCM2835_RSTC_RESET);
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mtx_unlock(&sc->mtx);
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*error = EINVAL;
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return;
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}
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ticks = (sec << 16) & BCM2835_WDOG_TIME_MASK;
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reg = (BCM2835_PASSWORD << BCM2835_PASSWORD_SHIFT) | ticks;
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WRITE(sc, BCM2835_WDOG_REG, reg);
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reg = READ(sc, BCM2835_RSTC_REG);
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reg &= BCM2835_RSTC_WRCFG_CLR;
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reg |= BCM2835_RSTC_WRCFG_FULL_RESET;
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reg |= (BCM2835_PASSWORD << BCM2835_PASSWORD_SHIFT);
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WRITE(sc, BCM2835_RSTC_REG, reg);
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*error = 0;
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}
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else
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WRITE(sc, BCM2835_RSTC_REG,
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(BCM2835_PASSWORD << BCM2835_PASSWORD_SHIFT) |
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BCM2835_RSTC_RESET);
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mtx_unlock(&sc->mtx);
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}
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void
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bcmwd_watchdog_reset(void)
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{
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if (bcmwd_lsc == NULL)
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return;
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WRITE(bcmwd_lsc, BCM2835_WDOG_REG,
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(BCM2835_PASSWORD << BCM2835_PASSWORD_SHIFT) | 10);
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WRITE(bcmwd_lsc, BCM2835_RSTC_REG,
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(READ(bcmwd_lsc, BCM2835_RSTC_REG) & BCM2835_RSTC_WRCFG_CLR) |
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(BCM2835_PASSWORD << BCM2835_PASSWORD_SHIFT) |
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BCM2835_RSTC_WRCFG_FULL_RESET);
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}
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static void
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bcmwd_reboot_system(void *sc, int howto)
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{
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int cmd, error = 0;
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/* Only handle reset. */
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if (howto & RB_HALT || howto & RB_POWEROFF)
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return;
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printf("Resetting system ... ");
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cmd = WD_TO_1SEC;
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bcmwd_watchdog_fn(sc, cmd, &error);
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/* Wait for watchdog timeout. */
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DELAY(2000000);
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/* Not reached ... one hopes. */
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printf("failed to reset (errno %d).\n", error);
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}
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static device_method_t bcmwd_methods[] = {
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DEVMETHOD(device_probe, bcmwd_probe),
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DEVMETHOD(device_attach, bcmwd_attach),
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DEVMETHOD_END
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};
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static driver_t bcmwd_driver = {
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"bcmwd",
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bcmwd_methods,
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sizeof(struct bcmwd_softc),
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};
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DRIVER_MODULE(bcmwd, simplebus, bcmwd_driver, 0, 0);
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