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From: Peter Maydell <peter.maydell@linaro.org>
To: qemu-devel@nongnu.org
Subject: [PULL 04/46] hw: gpio: implement gpio-pwr driver for qemu
reset/poweroff
Date: Fri, 29 Jan 2021 10:59:30 +0000
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From: Maxim Uvarov <maxim.uvarov@linaro.org>
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>
---
hw/gpio/gpio_pwr.c | 70 +++++++++++++++++++++++++++++++++++++++++++++
hw/gpio/Kconfig | 3 ++
hw/gpio/meson.build | 1 +
3 files changed, 74 insertions(+)
create mode 100644 hw/gpio/gpio_pwr.c
diff --git a/hw/gpio/gpio_pwr.c b/hw/gpio/gpio_pwr.c
new file mode 100644
index 00000000000..7714fa0dc4d
--- /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.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 late=
r.
+ * 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 =3D 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 =3D {
+ .name =3D TYPE_GPIOPWR,
+ .parent =3D TYPE_SYS_BUS_DEVICE,
+ .instance_size =3D sizeof(GPIO_PWR_State),
+ .instance_init =3D 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/Kconfig b/hw/gpio/Kconfig
index b6fdaa2586d..f0e7405f6e6 100644
--- a/hw/gpio/Kconfig
+++ b/hw/gpio/Kconfig
@@ -8,5 +8,8 @@ config PL061
config GPIO_KEY
bool
=20
+config GPIO_PWR
+ bool
+
config SIFIVE_GPIO
bool
diff --git a/hw/gpio/meson.build b/hw/gpio/meson.build
index 5c0a7d7b95a..79568f00ce3 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'))
--=20
2.20.1