qemu

FORK: QEMU emulator
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gpio_pwr.c (1738B)

      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)