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/sysbus.h" 27 #include "sysemu/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_reset_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) 71