diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/sysreset/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/sysreset/Makefile | 1 | ||||
| -rw-r--r-- | drivers/sysreset/sysreset_gpio.c | 59 |
3 files changed, 68 insertions, 0 deletions
diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig index a6d48e8a66..cec612ed50 100644 --- a/drivers/sysreset/Kconfig +++ b/drivers/sysreset/Kconfig @@ -15,6 +15,14 @@ config SYSRESET if SYSRESET +config SYSRESET_GPIO + bool "Enable support for GPIO reset driver" + select GPIO + help + Reset support via GPIO pin connected reset logic. This is used for + example on Microblaze where reset logic can be controlled via GPIO + pin which triggers cpu reset. + config SYSRESET_PSCI bool "Enable support for PSCI System Reset" depends on ARM_PSCI_FW diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile index 0da58a1cf6..ca533cfefa 100644 --- a/drivers/sysreset/Makefile +++ b/drivers/sysreset/Makefile @@ -3,6 +3,7 @@ # (C) Copyright 2016 Cadence Design Systems Inc. obj-$(CONFIG_SYSRESET) += sysreset-uclass.o +obj-$(CONFIG_SYSRESET_GPIO) += sysreset_gpio.o obj-$(CONFIG_SYSRESET_PSCI) += sysreset_psci.o obj-$(CONFIG_SYSRESET_SYSCON) += sysreset_syscon.o obj-$(CONFIG_SYSRESET_WATCHDOG) += sysreset_watchdog.o diff --git a/drivers/sysreset/sysreset_gpio.c b/drivers/sysreset/sysreset_gpio.c new file mode 100644 index 0000000000..ed9a49ad08 --- /dev/null +++ b/drivers/sysreset/sysreset_gpio.c @@ -0,0 +1,59 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018 Xilinx, Inc. - Michal Simek + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <sysreset.h> +#include <asm/gpio.h> + +struct gpio_reboot_priv { + struct gpio_desc gpio; +}; + +static int gpio_reboot_request(struct udevice *dev, enum sysreset_t type) +{ + struct gpio_reboot_priv *priv = dev_get_priv(dev); + + /* + * When debug log is enabled please make sure that chars won't end up + * in output fifo. Or you can append udelay(); to get enough time + * to HW to emit output fifo. + */ + debug("GPIO reset\n"); + + /* Writing 1 respects polarity (active high/low) based on gpio->flags */ + return dm_gpio_set_value(&priv->gpio, 1); +} + +static struct sysreset_ops gpio_reboot_ops = { + .request = gpio_reboot_request, +}; + +int gpio_reboot_probe(struct udevice *dev) +{ + struct gpio_reboot_priv *priv = dev_get_priv(dev); + + /* + * Linux kernel DT binding contain others optional properties + * which are not supported now + */ + + return gpio_request_by_name(dev, "gpios", 0, &priv->gpio, GPIOD_IS_OUT); +} + +static const struct udevice_id led_gpio_ids[] = { + { .compatible = "gpio-restart" }, + { } +}; + +U_BOOT_DRIVER(gpio_reboot) = { + .id = UCLASS_SYSRESET, + .name = "gpio_restart", + .of_match = led_gpio_ids, + .ops = &gpio_reboot_ops, + .priv_auto_alloc_size = sizeof(struct gpio_reboot_priv), + .probe = gpio_reboot_probe, +}; |