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/*
* GPIO qemu power controller
*
* Copyright (c) 2020 Linaro Limited
*
* Author: Maxim Uvarov <maxim.uvarov@linaro.org>
*
* Virtual gpio driver which can be used on top of pl061
* to reboot and shutdown qemu virtual machine. One of use
* case is gpio driver for secure world application (ARM
* Trusted Firmware.).
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* QEMU interface:
* two named input GPIO lines:
* 'reset' : when asserted, trigger system reset
* 'shutdown' : when asserted, trigger system shutdown
*/
#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "sysemu/runstate.h"
#define TYPE_GPIOPWR "gpio-pwr"
OBJECT_DECLARE_SIMPLE_TYPE(GPIO_PWR_State, GPIOPWR)
struct GPIO_PWR_State {
SysBusDevice parent_obj;
};
static void gpio_pwr_reset(void *opaque, int n, int level)
{
if (level) {
qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
}
}
static void gpio_pwr_shutdown(void *opaque, int n, int level)
{
if (level) {
qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
}
}
static void gpio_pwr_init(Object *obj)
{
DeviceState *dev = DEVICE(obj);
qdev_init_gpio_in_named(dev, gpio_pwr_reset, "reset", 1);
qdev_init_gpio_in_named(dev, gpio_pwr_shutdown, "shutdown", 1);
}
static const TypeInfo gpio_pwr_info = {
.name = TYPE_GPIOPWR,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(GPIO_PWR_State),
.instance_init = gpio_pwr_init,
};
static void gpio_pwr_register_types(void)
{
type_register_static(&gpio_pwr_info);
}
type_init(gpio_pwr_register_types)
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