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hw: gpio: implement gpio-pwr driver for qemu reset/poweroff

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Implement gpio-pwr driver to allow reboot and poweroff machine.
This is simple driver with just 2 gpios lines. Current use case
is to reboot and poweroff virt machine in secure mode. Secure
pl066 gpio chip is needed for that.

Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>
Reviewed-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Maxim Uvarov 2021-01-28 12:00:10 +00:00 committed by Peter Maydell
parent 7848023ae4
commit c97377652d
3 changed files with 74 additions and 0 deletions
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3
hw/gpio/Kconfig
View File

@ -8,5 +8,8 @@ config PL061
config GPIO_KEY
bool
config GPIO_PWR
bool
config SIFIVE_GPIO
bool

70
hw/gpio/gpio_pwr.c Normal file
View File

@ -0,0 +1,70 @@
/*
* GPIO qemu power controller
*
* Copyright (c) 2020 Linaro Limited
*
* Author: Maxim Uvarov <maxim.uvarov@linaro.org>
*
* Virtual gpio driver which can be used on top of pl061
* to reboot and shutdown qemu virtual machine. One of use
* case is gpio driver for secure world application (ARM
* Trusted Firmware.).
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* QEMU interface:
* two named input GPIO lines:
* 'reset' : when asserted, trigger system reset
* 'shutdown' : when asserted, trigger system shutdown
*/
#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "sysemu/runstate.h"
#define TYPE_GPIOPWR "gpio-pwr"
OBJECT_DECLARE_SIMPLE_TYPE(GPIO_PWR_State, GPIOPWR)
struct GPIO_PWR_State {
SysBusDevice parent_obj;
};
static void gpio_pwr_reset(void *opaque, int n, int level)
{
if (level) {
qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
}
}
static void gpio_pwr_shutdown(void *opaque, int n, int level)
{
if (level) {
qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
}
}
static void gpio_pwr_init(Object *obj)
{
DeviceState *dev = DEVICE(obj);
qdev_init_gpio_in_named(dev, gpio_pwr_reset, "reset", 1);
qdev_init_gpio_in_named(dev, gpio_pwr_shutdown, "shutdown", 1);
}
static const TypeInfo gpio_pwr_info = {
.name = TYPE_GPIOPWR,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(GPIO_PWR_State),
.instance_init = gpio_pwr_init,
};
static void gpio_pwr_register_types(void)
{
type_register_static(&gpio_pwr_info);
}
type_init(gpio_pwr_register_types)

1
hw/gpio/meson.build
View File

@ -1,5 +1,6 @@
softmmu_ss.add(when: 'CONFIG_E500', if_true: files('mpc8xxx.c'))
softmmu_ss.add(when: 'CONFIG_GPIO_KEY', if_true: files('gpio_key.c'))
softmmu_ss.add(when: 'CONFIG_GPIO_PWR', if_true: files('gpio_pwr.c'))
softmmu_ss.add(when: 'CONFIG_MAX7310', if_true: files('max7310.c'))
softmmu_ss.add(when: 'CONFIG_PL061', if_true: files('pl061.c'))
softmmu_ss.add(when: 'CONFIG_PUV3', if_true: files('puv3_gpio.c'))