diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-at91/Kconfig | 5 | ||||
| -rw-r--r-- | arch/arm/mach-at91/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/mach-at91/at91sam9_rst.c | 72 |
3 files changed, 78 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig index 5267102bf9..0eb5410664 100644 --- a/arch/arm/mach-at91/Kconfig +++ b/arch/arm/mach-at91/Kconfig @@ -41,12 +41,16 @@ config AT91SAM926X_BOARD_INIT config AT91SAM9_SMC bool +config HAVE_AT91SAM9_RST + bool + config SOC_AT91SAM9 bool select CPU_ARM926T select AT91SAM9_SMC select CLOCKSOURCE_ATMEL_PIT select PINCTRL + select HAVE_AT91SAM9_RST select HAVE_AT91_SMD select HAVE_AT91_USB_CLK select HAVE_AT91_UTMI @@ -54,6 +58,7 @@ config SOC_AT91SAM9 config SOC_SAMA5 bool + select HAVE_AT91SAM9_RST select CPU_V7 config SOC_SAMA5D2 diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile index 66d0b700f6..89aff54b8a 100644 --- a/arch/arm/mach-at91/Makefile +++ b/arch/arm/mach-at91/Makefile @@ -13,6 +13,7 @@ obj-y += at91sam9_reset.o obj-y += at91sam9g45_reset.o obj-$(CONFIG_AT91SAM9_SMC) += sam9_smc.o +obj-$(CONFIG_HAVE_AT91SAM9_RST) += at91sam9_rst.o # CPU-specific support obj-$(CONFIG_SOC_AT91RM9200) += at91rm9200.o at91rm9200_time.o at91rm9200_devices.o diff --git a/arch/arm/mach-at91/at91sam9_rst.c b/arch/arm/mach-at91/at91sam9_rst.c new file mode 100644 index 0000000000..8f03576e69 --- /dev/null +++ b/arch/arm/mach-at91/at91sam9_rst.c @@ -0,0 +1,72 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 Pengutronix, Ahmad Fatoum <a.fatoum@pengutronix.de> + */ + +#include <common.h> +#include <init.h> +#include <io.h> +#include <restart.h> +#include <linux/clk.h> +#include <mach/at91_rstc.h> + +struct at91sam9x_rst { + struct restart_handler restart; + void __iomem *base; +}; + +static void __noreturn at91sam9x_restart_soc(struct restart_handler *rst) +{ + struct at91sam9x_rst *priv = container_of(rst, struct at91sam9x_rst, restart); + + writel(AT91_RSTC_PROCRST + | AT91_RSTC_PERRST + | AT91_RSTC_EXTRST + | AT91_RSTC_KEY, + priv->base + AT91_RSTC_CR); + + hang(); +} + +static int at91sam9x_rst_probe(struct device_d *dev) +{ + struct at91sam9x_rst *priv; + struct resource *iores; + struct clk *clk; + + iores = dev_request_mem_resource(dev, 0); + if (IS_ERR(iores)) { + dev_err(dev, "could not get reset memory region\n"); + return PTR_ERR(iores); + } + + priv = xzalloc(sizeof(*priv)); + priv->base = IOMEM(iores->start); + + clk = clk_get(dev, NULL); + if (IS_ERR(clk)) { + release_region(iores); + free(priv); + return PTR_ERR(clk); + } + + clk_enable(clk); + + priv->restart.name = "at91sam9x-rst"; + priv->restart.restart = at91sam9x_restart_soc; + + return restart_handler_register(&priv->restart); +} + +static const __maybe_unused struct of_device_id at91sam9x_rst_dt_ids[] = { + { .compatible = "atmel,at91sam9g45-rstc", }, + { .compatible = "atmel,sama5d3-rstc", }, + { /* sentinel */ }, +}; + +static struct driver_d at91sam9x_rst_driver = { + .name = "at91sam9x-rst", + .of_compatible = DRV_OF_COMPAT(at91sam9x_rst_dt_ids), + .probe = at91sam9x_rst_probe, +}; +device_platform_driver(at91sam9x_rst_driver); |