qemu

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