c97377652d
Implement gpio-pwr driver to allow reboot and poweroff machine. This is simple driver with just 2 gpios lines. Current use case is to reboot and poweroff virt machine in secure mode. Secure pl066 gpio chip is needed for that. Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org> Reviewed-by: Hao Wu <wuhaotsh@google.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/*
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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_reset_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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