This patch adds a sysreset driver for Atmel/Microchip platforms.
Signed-off-by: Sergiu Moga sergiu.moga@microchip.com Reviewed-by: Claudiu Beznea claudiu.beznea@microchip.com --- drivers/sysreset/Kconfig | 15 +++++++ drivers/sysreset/Makefile | 1 + drivers/sysreset/sysreset_at91.c | 71 ++++++++++++++++++++++++++++++++ 3 files changed, 87 insertions(+) create mode 100644 drivers/sysreset/sysreset_at91.c
diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig index f6d60038b8..25dd02c704 100644 --- a/drivers/sysreset/Kconfig +++ b/drivers/sysreset/Kconfig @@ -77,6 +77,21 @@ config SYSRESET_OCTEON This enables the system reset driver support for Marvell Octeon SoCs.
+config SYSRESET_AT91 + bool "Enable support for Microchip/Atmel reset driver" + depends on ARCH_AT91 + select SYSRESET_SPL_AT91 if SPL && SPL_SYSRESET + help + This enables the system reset driver support for Microchip/Atmel + SoCs. + +config SYSRESET_SPL_AT91 + bool "Enable support for Microchip/Atmel reset driver in SPL" + depends on ARCH_AT91 + help + This enables the system reset driver support for Microchip/Atmel + SoCs in SPL. + 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 8e00be0779..0ed3bbf356 100644 --- a/drivers/sysreset/Makefile +++ b/drivers/sysreset/Makefile @@ -20,5 +20,6 @@ obj-$(CONFIG_SYSRESET_TI_SCI) += sysreset-ti-sci.o obj-$(CONFIG_SYSRESET_SYSCON) += sysreset_syscon.o obj-$(CONFIG_SYSRESET_WATCHDOG) += sysreset_watchdog.o obj-$(CONFIG_SYSRESET_RESETCTL) += sysreset_resetctl.o +obj-$(CONFIG_SYSRESET_$(SPL_TPL_)AT91) += sysreset_at91.o obj-$(CONFIG_$(SPL_TPL_)SYSRESET_X86) += sysreset_x86.o obj-$(CONFIG_TARGET_XTFPGA) += sysreset_xtfpga.o diff --git a/drivers/sysreset/sysreset_at91.c b/drivers/sysreset/sysreset_at91.c new file mode 100644 index 0000000000..24b87ee987 --- /dev/null +++ b/drivers/sysreset/sysreset_at91.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2022 Microchip Technology, Inc. and its subsidiaries + */ + +#include <asm/arch/hardware.h> +#include <asm/io.h> +#include <asm/arch/at91_rstc.h> +#include <clk.h> +#include <common.h> +#include <cpu_func.h> +#include <dm.h> +#include <dm/device_compat.h> +#include <dm/device-internal.h> +#include <sysreset.h> + +static int at91_sysreset_request(struct udevice *dev, enum sysreset_t type) +{ + at91_rstc_t *rstc = (at91_rstc_t *)dev_get_priv(dev); + + writel(AT91_RSTC_KEY + | AT91_RSTC_CR_PROCRST /* Processor Reset */ + | AT91_RSTC_CR_PERRST /* Peripheral Reset */ +#ifdef CONFIG_AT91RESET_EXTRST + | AT91_RSTC_CR_EXTRST /* External Reset (assert nRST pin) */ +#endif + , &rstc->cr); + + return -EINPROGRESS; +} + +static int at91_sysreset_probe(struct udevice *dev) +{ + struct clk slck; + void *priv; + int ret; + + priv = dev_remap_addr(dev); + if (!priv) + return -EINVAL; + + dev_set_priv(dev, priv); + + ret = clk_get_by_index(dev, 0, &slck); + if (ret) + return ret; + + ret = clk_prepare_enable(&slck); + if (ret) + return ret; + + return 0; +} + +static struct sysreset_ops at91_sysreset = { + .request = at91_sysreset_request, +}; + +static const struct udevice_id a91_sysreset_ids[] = { + { .compatible = "atmel,sama5d3-rstc" }, + { .compatible = "microchip,sam9x60-rstc" }, + { } +}; + +U_BOOT_DRIVER(sysreset_at91) = { + .id = UCLASS_SYSRESET, + .name = "at91_reset", + .ops = &at91_sysreset, + .probe = at91_sysreset_probe, + .of_match = a91_sysreset_ids, +};