mirror of https://gitee.com/openkylin/qemu.git
91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/*
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* Copyright (c) 2018, Impinj, Inc.
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*
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* i.MX2 Watchdog IP block
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*
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* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/bitops.h"
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#include "qemu/module.h"
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#include "sysemu/watchdog.h"
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#include "hw/misc/imx2_wdt.h"
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#define IMX2_WDT_WCR_WDA BIT(5) /* -> External Reset WDOG_B */
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#define IMX2_WDT_WCR_SRS BIT(4) /* -> Software Reset Signal */
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static uint64_t imx2_wdt_read(void *opaque, hwaddr addr,
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unsigned int size)
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{
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return 0;
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}
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static void imx2_wdt_write(void *opaque, hwaddr addr,
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uint64_t value, unsigned int size)
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{
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if (addr == IMX2_WDT_WCR &&
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(value & (IMX2_WDT_WCR_WDA | IMX2_WDT_WCR_SRS))) {
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watchdog_perform_action();
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}
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}
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static const MemoryRegionOps imx2_wdt_ops = {
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.read = imx2_wdt_read,
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.write = imx2_wdt_write,
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.endianness = DEVICE_NATIVE_ENDIAN,
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.impl = {
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/*
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* Our device would not work correctly if the guest was doing
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* unaligned access. This might not be a limitation on the
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* real device but in practice there is no reason for a guest
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* to access this device unaligned.
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*/
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.min_access_size = 4,
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.max_access_size = 4,
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.unaligned = false,
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},
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};
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static void imx2_wdt_realize(DeviceState *dev, Error **errp)
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{
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IMX2WdtState *s = IMX2_WDT(dev);
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memory_region_init_io(&s->mmio, OBJECT(dev),
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&imx2_wdt_ops, s,
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TYPE_IMX2_WDT".mmio",
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IMX2_WDT_REG_NUM * sizeof(uint16_t));
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sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->mmio);
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}
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static void imx2_wdt_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 = imx2_wdt_realize;
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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}
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static const TypeInfo imx2_wdt_info = {
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.name = TYPE_IMX2_WDT,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(IMX2WdtState),
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.class_init = imx2_wdt_class_init,
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};
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static WatchdogTimerModel model = {
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.wdt_name = "imx2-watchdog",
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.wdt_description = "i.MX2 Watchdog",
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};
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static void imx2_wdt_register_type(void)
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{
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watchdog_add_model(&model);
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type_register_static(&imx2_wdt_info);
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}
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type_init(imx2_wdt_register_type)
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