LXR qemu/hw/gpio/gpio

   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"
  30OBJECT_DECLARE_SIMPLE_TYPE(GPIO_PWR_State, GPIOPWR)
  31
  32struct GPIO_PWR_State {
  33    SysBusDevice parent_obj;
  34};
  35
  36static 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
  43static 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
  50static 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
  58static 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
  65static void gpio_pwr_register_types(void)
  66{
  67    type_register_static(&gpio_pwr_info);
  68}
  69
  70type_init(gpio_pwr_register_types)
  71