On Tue, Jan 12, 2021 at 6:36 AM Maxim Uvarov <maxim.uva...@linaro.org>
wrote:
> 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.uva...@linaro.org>
>
Reviewed-by: Hao Wu <wuhao...@google.com>
> ---
> hw/gpio/Kconfig | 3 ++
> hw/gpio/gpio_pwr.c | 70 +++++++++++++++++++++++++++++++++++++++++++++
> hw/gpio/meson.build | 1 +
> 3 files changed, 74 insertions(+)
> create mode 100644 hw/gpio/gpio_pwr.c
>
> diff --git a/hw/gpio/Kconfig b/hw/gpio/Kconfig
> index b6fdaa2586..f0e7405f6e 100644
> --- a/hw/gpio/Kconfig
> +++ b/hw/gpio/Kconfig
> @@ -8,5 +8,8 @@ config PL061
> config GPIO_KEY
> bool
>
> +config GPIO_PWR
> + bool
> +
> config SIFIVE_GPIO
> bool
> diff --git a/hw/gpio/gpio_pwr.c b/hw/gpio/gpio_pwr.c
> new file mode 100644
> index 0000000000..8ed8d5d24f
> --- /dev/null
> +++ b/hw/gpio/gpio_pwr.c
> @@ -0,0 +1,70 @@
> +/*
> + * GPIO qemu power controller
> + *
> + * Copyright (c) 2020 Linaro Limited
> + *
> + * Author: Maxim Uvarov <maxim.uva...@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)
> diff --git a/hw/gpio/meson.build b/hw/gpio/meson.build
> index 5c0a7d7b95..79568f00ce 100644
> --- a/hw/gpio/meson.build
> +++ b/hw/gpio/meson.build
> @@ -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'))
> --
> 2.17.1
>
>
>
