278 lines
7.1 KiB
C
278 lines
7.1 KiB
C
/*-
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* Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
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* Copyright (c) 2016 Emmanuel Vadot <manu@bidouilliste.com>
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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/systm.h>
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#include <sys/watchdog.h>
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#include <sys/reboot.h>
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#include <sys/bus.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/rman.h>
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#include <dev/fdt/fdt_common.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/cpufunc.h>
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#include <machine/machdep.h>
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#include <arm/allwinner/aw_wdog.h>
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#define READ(_sc, _r) bus_read_4((_sc)->res, (_r))
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#define WRITE(_sc, _r, _v) bus_write_4((_sc)->res, (_r), (_v))
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#define A10_WDOG_CTRL 0x00
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#define A31_WDOG_CTRL 0x10
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#define WDOG_CTRL_RESTART (1 << 0)
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#define A31_WDOG_CTRL_KEY (0xa57 << 1)
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#define A10_WDOG_MODE 0x04
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#define A31_WDOG_MODE 0x18
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#define A10_WDOG_MODE_INTVL_SHIFT 3
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#define A31_WDOG_MODE_INTVL_SHIFT 4
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#define A10_WDOG_MODE_RST_EN (1 << 1)
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#define WDOG_MODE_EN (1 << 0)
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#define A31_WDOG_CONFIG 0x14
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#define A31_WDOG_CONFIG_RST_EN_SYSTEM (1 << 0)
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#define A31_WDOG_CONFIG_RST_EN_INT (2 << 0)
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struct aw_wdog_interval {
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uint64_t milliseconds;
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unsigned int value;
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};
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struct aw_wdog_interval wd_intervals[] = {
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{ 500, 0 },
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{ 1000, 1 },
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{ 2000, 2 },
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{ 3000, 3 },
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{ 4000, 4 },
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{ 5000, 5 },
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{ 6000, 6 },
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{ 8000, 7 },
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{ 10000, 8 },
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{ 12000, 9 },
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{ 14000, 10 },
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{ 16000, 11 },
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{ 0, 0 } /* sentinel */
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};
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static struct aw_wdog_softc *aw_wdog_sc = NULL;
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struct aw_wdog_softc {
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device_t dev;
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struct resource * res;
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struct mtx mtx;
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uint8_t wdog_ctrl;
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uint32_t wdog_ctrl_key;
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uint8_t wdog_mode;
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uint8_t wdog_mode_intvl_shift;
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uint8_t wdog_mode_en;
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uint8_t wdog_config;
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uint8_t wdog_config_value;
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};
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#define A10_WATCHDOG 1
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#define A31_WATCHDOG 2
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static struct ofw_compat_data compat_data[] = {
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{"allwinner,sun4i-a10-wdt", A10_WATCHDOG},
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{"allwinner,sun6i-a31-wdt", A31_WATCHDOG},
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{NULL, 0}
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};
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static void aw_wdog_watchdog_fn(void *, u_int, int *);
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static void aw_wdog_shutdown_fn(void *, int);
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static int
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aw_wdog_probe(device_t dev)
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{
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struct aw_wdog_softc *sc;
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sc = device_get_softc(dev);
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
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case A10_WATCHDOG:
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device_set_desc(dev, "Allwinner A10 Watchdog");
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return (BUS_PROBE_DEFAULT);
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case A31_WATCHDOG:
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device_set_desc(dev, "Allwinner A31 Watchdog");
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return (BUS_PROBE_DEFAULT);
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}
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return (ENXIO);
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}
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static int
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aw_wdog_attach(device_t dev)
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{
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struct aw_wdog_softc *sc;
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int rid;
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if (aw_wdog_sc != NULL)
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return (ENXIO);
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sc = device_get_softc(dev);
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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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aw_wdog_sc = sc;
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switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
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case A10_WATCHDOG:
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sc->wdog_ctrl = A10_WDOG_CTRL;
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sc->wdog_mode = A10_WDOG_MODE;
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sc->wdog_mode_intvl_shift = A10_WDOG_MODE_INTVL_SHIFT;
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sc->wdog_mode_en = A10_WDOG_MODE_RST_EN | WDOG_MODE_EN;
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break;
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case A31_WATCHDOG:
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sc->wdog_ctrl = A31_WDOG_CTRL;
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sc->wdog_ctrl_key = A31_WDOG_CTRL_KEY;
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sc->wdog_mode = A31_WDOG_MODE;
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sc->wdog_mode_intvl_shift = A31_WDOG_MODE_INTVL_SHIFT;
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sc->wdog_mode_en = WDOG_MODE_EN;
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sc->wdog_config = A31_WDOG_CONFIG;
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sc->wdog_config_value = A31_WDOG_CONFIG_RST_EN_SYSTEM;
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break;
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default:
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bus_release_resource(dev, SYS_RES_MEMORY, rid, sc->res);
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return (ENXIO);
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}
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mtx_init(&sc->mtx, "AW Watchdog", "aw_wdog", MTX_DEF);
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EVENTHANDLER_REGISTER(watchdog_list, aw_wdog_watchdog_fn, sc, 0);
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EVENTHANDLER_REGISTER(shutdown_final, aw_wdog_shutdown_fn, 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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aw_wdog_watchdog_fn(void *private, u_int cmd, int *error)
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{
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struct aw_wdog_softc *sc;
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uint64_t ms;
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int i;
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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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ms = ((uint64_t)1 << (cmd & WD_INTERVAL)) / 1000000;
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i = 0;
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while (wd_intervals[i].milliseconds &&
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(ms > wd_intervals[i].milliseconds))
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i++;
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if (wd_intervals[i].milliseconds) {
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WRITE(sc, sc->wdog_mode,
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(wd_intervals[i].value << sc->wdog_mode_intvl_shift) |
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sc->wdog_mode_en);
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WRITE(sc, sc->wdog_ctrl,
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WDOG_CTRL_RESTART | sc->wdog_ctrl_key);
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if (sc->wdog_config)
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WRITE(sc, sc->wdog_config,
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sc->wdog_config_value);
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*error = 0;
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}
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else {
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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 is more than 16 sec\n");
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mtx_unlock(&sc->mtx);
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WRITE(sc, sc->wdog_mode, 0);
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return;
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}
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}
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else
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WRITE(sc, sc->wdog_mode, 0);
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mtx_unlock(&sc->mtx);
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}
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static void
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aw_wdog_shutdown_fn(void *private, int howto)
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{
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if ((howto & (RB_POWEROFF|RB_HALT)) == 0)
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aw_wdog_watchdog_reset();
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}
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void
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aw_wdog_watchdog_reset()
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{
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if (aw_wdog_sc == NULL) {
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printf("Reset: watchdog device has not been initialized\n");
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return;
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}
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WRITE(aw_wdog_sc, aw_wdog_sc->wdog_mode,
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(wd_intervals[0].value << aw_wdog_sc->wdog_mode_intvl_shift) |
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aw_wdog_sc->wdog_mode_en);
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if (aw_wdog_sc->wdog_config)
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WRITE(aw_wdog_sc, aw_wdog_sc->wdog_config,
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aw_wdog_sc->wdog_config_value);
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WRITE(aw_wdog_sc, aw_wdog_sc->wdog_ctrl,
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WDOG_CTRL_RESTART | aw_wdog_sc->wdog_ctrl_key);
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while(1)
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;
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}
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static device_method_t aw_wdog_methods[] = {
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DEVMETHOD(device_probe, aw_wdog_probe),
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DEVMETHOD(device_attach, aw_wdog_attach),
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DEVMETHOD_END
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};
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static driver_t aw_wdog_driver = {
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"aw_wdog",
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aw_wdog_methods,
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sizeof(struct aw_wdog_softc),
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};
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static devclass_t aw_wdog_devclass;
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DRIVER_MODULE(aw_wdog, simplebus, aw_wdog_driver, aw_wdog_devclass, 0, 0);
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