Merge tag 'net-pull-request' of https://github.com/jasowang/qemu into staging
[qemu.git] / hw / gpio / gpio_pwr.c
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_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)