156 lines
4.1 KiB
C
156 lines
4.1 KiB
C
/*
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* Virtual hardware watchdog.
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*
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* Copyright (C) 2009 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* By Richard W.M. Jones (rjones@redhat.com).
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*/
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#include "qemu/osdep.h"
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#include "qemu/module.h"
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#include "qemu/timer.h"
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#include "sysemu/watchdog.h"
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#include "hw/isa/isa.h"
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#include "migration/vmstate.h"
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/*#define IB700_DEBUG 1*/
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#ifdef IB700_DEBUG
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#define ib700_debug(fs,...) \
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fprintf(stderr,"ib700: %s: "fs,__func__,##__VA_ARGS__)
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#else
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#define ib700_debug(fs,...)
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#endif
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#define TYPE_IB700 "ib700"
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#define IB700(obj) OBJECT_CHECK(IB700State, (obj), TYPE_IB700)
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typedef struct IB700state {
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ISADevice parent_obj;
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QEMUTimer *timer;
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PortioList port_list;
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} IB700State;
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/* This is the timer. We use a global here because the watchdog
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* code ensures there is only one watchdog (it is located at a fixed,
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* unchangeable IO port, so there could only ever be one anyway).
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*/
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/* A write to this register enables the timer. */
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static void ib700_write_enable_reg(void *vp, uint32_t addr, uint32_t data)
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{
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IB700State *s = vp;
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static int time_map[] = {
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30, 28, 26, 24, 22, 20, 18, 16,
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14, 12, 10, 8, 6, 4, 2, 0
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};
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int64_t timeout;
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ib700_debug("addr = %x, data = %x\n", addr, data);
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timeout = (int64_t) time_map[data & 0xF] * NANOSECONDS_PER_SECOND;
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timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + timeout);
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}
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/* A write (of any value) to this register disables the timer. */
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static void ib700_write_disable_reg(void *vp, uint32_t addr, uint32_t data)
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{
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IB700State *s = vp;
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ib700_debug("addr = %x, data = %x\n", addr, data);
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timer_del(s->timer);
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}
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/* This is called when the watchdog expires. */
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static void ib700_timer_expired(void *vp)
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{
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IB700State *s = vp;
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ib700_debug("watchdog expired\n");
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watchdog_perform_action();
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timer_del(s->timer);
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}
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static const VMStateDescription vmstate_ib700 = {
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.name = "ib700_wdt",
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.version_id = 0,
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.minimum_version_id = 0,
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.fields = (VMStateField[]) {
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VMSTATE_TIMER_PTR(timer, IB700State),
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VMSTATE_END_OF_LIST()
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}
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};
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static const MemoryRegionPortio wdt_portio_list[] = {
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{ 0x441, 2, 1, .write = ib700_write_disable_reg, },
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{ 0x443, 2, 1, .write = ib700_write_enable_reg, },
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PORTIO_END_OF_LIST(),
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};
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static void wdt_ib700_realize(DeviceState *dev, Error **errp)
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{
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IB700State *s = IB700(dev);
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ib700_debug("watchdog init\n");
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s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, ib700_timer_expired, s);
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portio_list_init(&s->port_list, OBJECT(s), wdt_portio_list, s, "ib700");
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portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj), 0);
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}
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static void wdt_ib700_reset(DeviceState *dev)
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{
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IB700State *s = IB700(dev);
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ib700_debug("watchdog reset\n");
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timer_del(s->timer);
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}
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static WatchdogTimerModel model = {
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.wdt_name = "ib700",
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.wdt_description = "iBASE 700",
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};
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static void wdt_ib700_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->realize = wdt_ib700_realize;
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dc->reset = wdt_ib700_reset;
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dc->vmsd = &vmstate_ib700;
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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}
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static const TypeInfo wdt_ib700_info = {
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.name = TYPE_IB700,
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.parent = TYPE_ISA_DEVICE,
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.instance_size = sizeof(IB700State),
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.class_init = wdt_ib700_class_init,
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};
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static void wdt_ib700_register_types(void)
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{
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watchdog_add_model(&model);
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type_register_static(&wdt_ib700_info);
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}
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type_init(wdt_ib700_register_types)
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