| 1 | /* |
| 2 | * GPIO qemu power controller |
| 3 | * |
| 4 | * Copyright (c) 2020 Linaro Limited |
| 5 | * |
| 6 | * Author: Maxim Uvarov <maxim.uvarov@linaro.org> |
| 7 | * |
| 8 | * Virtual gpio driver which can be used on top of pl061 |
| 9 | * to reboot and shutdown qemu virtual machine. One of use |
| 10 | * case is gpio driver for secure world application (ARM |
| 11 | * Trusted Firmware.). |
| 12 | * |
| 13 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 14 | * See the COPYING file in the top-level directory. |
| 15 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 16 | */ |
| 17 | |
| 18 | /* |
| 19 | * QEMU interface: |
| 20 | * two named input GPIO lines: |
| 21 | * 'reset' : when asserted, trigger system reset |
| 22 | * 'shutdown' : when asserted, trigger system shutdown |
| 23 | */ |
| 24 | |
| 25 | #include "qemu/osdep.h" |
| 26 | #include "hw/core/sysbus.h" |
| 27 | #include "system/runstate.h" |
| 28 | |
| 29 | #define TYPE_GPIOPWR "gpio-pwr" |
| 30 | OBJECT_DECLARE_SIMPLE_TYPE(GPIO_PWR_State, GPIOPWR) |
| 31 | |
| 32 | struct GPIO_PWR_State { |
| 33 | SysBusDevice parent_obj; |
| 34 | }; |
| 35 | |
| 36 | static void gpio_pwr_reset(void *opaque, int n, int level) |
| 37 | { |
| 38 | if (level) { |
| 39 | qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | static void gpio_pwr_shutdown(void *opaque, int n, int level) |
| 44 | { |
| 45 | if (level) { |
| 46 | qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | static void gpio_pwr_init(Object *obj) |
| 51 | { |
| 52 | DeviceState *dev = DEVICE(obj); |
| 53 | |
| 54 | qdev_init_gpio_in_named(dev, gpio_pwr_reset, "reset", 1); |
| 55 | qdev_init_gpio_in_named(dev, gpio_pwr_shutdown, "shutdown", 1); |
| 56 | } |
| 57 | |
| 58 | static const TypeInfo gpio_pwr_info = { |
| 59 | .name = TYPE_GPIOPWR, |
| 60 | .parent = TYPE_SYS_BUS_DEVICE, |
| 61 | .instance_size = sizeof(GPIO_PWR_State), |
| 62 | .instance_init = gpio_pwr_init, |
| 63 | }; |
| 64 | |
| 65 | static void gpio_pwr_register_types(void) |
| 66 | { |
| 67 | type_register_static(&gpio_pwr_info); |
| 68 | } |
| 69 | |
| 70 | type_init(gpio_pwr_register_types) |