2009-04-25 14:56:19 +02:00
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/*
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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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2009-07-16 22:47:01 +02:00
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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2009-04-25 14:56:19 +02:00
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*
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* By Richard W.M. Jones (rjones@redhat.com).
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*/
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2016-01-26 19:17:30 +01:00
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#include "qemu/osdep.h"
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2019-05-23 16:35:07 +02:00
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#include "qemu/module.h"
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2012-12-17 18:20:00 +01:00
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#include "qemu/timer.h"
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2013-02-05 17:06:20 +01:00
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#include "sysemu/watchdog.h"
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#include "hw/isa/isa.h"
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2019-08-12 07:23:45 +02:00
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#include "migration/vmstate.h"
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2020-09-03 22:43:22 +02:00
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#include "qom/object.h"
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2009-04-25 14:56:19 +02:00
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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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2013-04-27 22:18:55 +02:00
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#define TYPE_IB700 "ib700"
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2020-09-03 22:43:22 +02:00
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typedef struct IB700state IB700State;
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2020-08-31 23:07:33 +02:00
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DECLARE_INSTANCE_CHECKER(IB700State, IB700,
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TYPE_IB700)
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2013-04-27 22:18:55 +02:00
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2020-09-03 22:43:22 +02:00
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struct IB700state {
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2013-04-27 22:18:55 +02:00
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ISADevice parent_obj;
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2009-10-15 00:54:28 +02:00
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QEMUTimer *timer;
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2014-04-29 15:38:39 +02:00
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PortioList port_list;
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2020-09-03 22:43:22 +02:00
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};
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2009-10-15 00:49:17 +02:00
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2009-04-25 14:56:19 +02:00
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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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2011-11-29 09:52:39 +01:00
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* unchangeable IO port, so there could only ever be one anyway).
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2009-04-25 14:56:19 +02:00
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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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2009-10-15 00:54:28 +02:00
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IB700State *s = vp;
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2009-04-25 14:56:19 +02:00
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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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2010-12-19 17:22:40 +01:00
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int64_t timeout;
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2009-04-25 14:56:19 +02:00
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ib700_debug("addr = %x, data = %x\n", addr, data);
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2016-03-21 17:02:30 +01:00
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timeout = (int64_t) time_map[data & 0xF] * NANOSECONDS_PER_SECOND;
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2013-08-21 17:03:08 +02:00
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timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + timeout);
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2009-04-25 14:56:19 +02:00
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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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2009-10-15 00:54:28 +02:00
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IB700State *s = vp;
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2009-04-25 14:56:19 +02:00
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ib700_debug("addr = %x, data = %x\n", addr, data);
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2013-08-21 17:03:08 +02:00
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timer_del(s->timer);
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2009-04-25 14:56:19 +02:00
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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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2009-10-15 00:54:28 +02:00
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IB700State *s = vp;
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2009-04-25 14:56:19 +02:00
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ib700_debug("watchdog expired\n");
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watchdog_perform_action();
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2013-08-21 17:03:08 +02:00
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timer_del(s->timer);
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2009-04-25 14:56:19 +02:00
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}
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2009-10-15 00:57:35 +02:00
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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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2014-04-16 15:32:32 +02:00
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.fields = (VMStateField[]) {
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2015-01-08 10:18:59 +01:00
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VMSTATE_TIMER_PTR(timer, IB700State),
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2009-10-15 00:57:35 +02:00
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VMSTATE_END_OF_LIST()
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}
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};
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2009-04-25 14:56:19 +02:00
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2013-06-22 08:06:56 +02:00
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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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2012-11-25 02:37:14 +01:00
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static void wdt_ib700_realize(DeviceState *dev, Error **errp)
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2009-04-25 14:56:19 +02:00
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{
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2013-04-27 22:18:55 +02:00
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IB700State *s = IB700(dev);
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2009-10-15 00:49:17 +02:00
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2010-09-24 17:08:06 +02:00
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ib700_debug("watchdog init\n");
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2013-08-21 17:03:08 +02:00
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s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, ib700_timer_expired, s);
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2013-06-22 08:06:56 +02:00
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2014-04-29 15:38:39 +02:00
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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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2009-04-25 14:56:19 +02:00
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}
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2010-09-24 17:08:06 +02:00
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static void wdt_ib700_reset(DeviceState *dev)
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{
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2013-04-27 22:18:55 +02:00
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IB700State *s = IB700(dev);
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2010-09-24 17:08:06 +02:00
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ib700_debug("watchdog reset\n");
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2013-08-21 17:03:08 +02:00
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timer_del(s->timer);
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2010-09-24 17:08:06 +02:00
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}
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2011-12-04 18:52:49 +01:00
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static void wdt_ib700_class_init(ObjectClass *klass, void *data)
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{
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2011-12-08 04:34:16 +01:00
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DeviceClass *dc = DEVICE_CLASS(klass);
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2012-11-25 02:37:14 +01:00
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dc->realize = wdt_ib700_realize;
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2011-12-08 04:34:16 +01:00
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dc->reset = wdt_ib700_reset;
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dc->vmsd = &vmstate_ib700;
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2021-10-27 14:34:53 +02:00
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set_bit(DEVICE_CATEGORY_WATCHDOG, dc->categories);
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dc->desc = "iBASE 700";
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2011-12-04 18:52:49 +01:00
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}
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2013-01-10 16:19:07 +01:00
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static const TypeInfo wdt_ib700_info = {
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2013-04-27 22:18:55 +02:00
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.name = TYPE_IB700,
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2011-12-08 04:34:16 +01:00
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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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2009-08-21 10:31:34 +02:00
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};
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2012-02-09 15:20:55 +01:00
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static void wdt_ib700_register_types(void)
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2009-04-25 14:56:19 +02:00
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{
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2011-12-08 04:34:16 +01:00
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type_register_static(&wdt_ib700_info);
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2009-04-25 14:56:19 +02:00
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}
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2009-08-21 10:31:34 +02:00
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2012-02-09 15:20:55 +01:00
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type_init(wdt_ib700_register_types)
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