Tegra uses built in Power Management Controller (PMC) to perform CPU reset. Code to perform this was located in mach-tegra, so lest create DM driver to handle this.
Signed-off-by: Svyatoslav Ryhel clamor95@gmail.com --- drivers/sysreset/Kconfig | 6 ++++ drivers/sysreset/Makefile | 1 + drivers/sysreset/sysreset_tegra.c | 46 +++++++++++++++++++++++++++++++ 3 files changed, 53 insertions(+) create mode 100644 drivers/sysreset/sysreset_tegra.c
diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig index bdbe2a9536..eab556c349 100644 --- a/drivers/sysreset/Kconfig +++ b/drivers/sysreset/Kconfig @@ -137,6 +137,12 @@ config SYSRESET_SOCFPGA_SOC64 This enables the system reset driver support for Intel SOCFPGA SoC64 SoCs.
+config SYSRESET_TEGRA + bool "Tegra PMC system reset driver" + depends on ARCH_TEGRA + help + This enables the system reset ability of PMC used in Tegra SoCs. + config SYSRESET_TI_SCI bool "TI System Control Interface (TI SCI) system reset driver" depends on TI_SCI_PROTOCOL diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile index 40c876764a..a9ac123754 100644 --- a/drivers/sysreset/Makefile +++ b/drivers/sysreset/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_SYSRESET_PSCI) += sysreset_psci.o obj-$(CONFIG_SYSRESET_SBI) += sysreset_sbi.o obj-$(CONFIG_SYSRESET_SOCFPGA) += sysreset_socfpga.o obj-$(CONFIG_SYSRESET_SOCFPGA_SOC64) += sysreset_socfpga_soc64.o +obj-$(CONFIG_SYSRESET_TEGRA) += sysreset_tegra.o obj-$(CONFIG_SYSRESET_TI_SCI) += sysreset-ti-sci.o obj-$(CONFIG_SYSRESET_SYSCON) += sysreset_syscon.o obj-$(CONFIG_SYSRESET_WATCHDOG) += sysreset_watchdog.o diff --git a/drivers/sysreset/sysreset_tegra.c b/drivers/sysreset/sysreset_tegra.c new file mode 100644 index 0000000000..761fd57a12 --- /dev/null +++ b/drivers/sysreset/sysreset_tegra.c @@ -0,0 +1,46 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright(C) 2023 Svyatoslav Ryhel clamor95@gmail.com + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <sysreset.h> +#include <linux/err.h> +#include <asm/arch-tegra/pmc.h> + +static int tegra_sysreset_request(struct udevice *dev, + enum sysreset_t type) +{ + switch (type) { + case SYSRESET_WARM: + case SYSRESET_COLD: + u32 value; + + /* resets everything but scratch 0 and reset status */ + value = tegra_pmc_readl(PMC_CNTRL); + value |= PMC_CNTRL_MAIN_RST; + tegra_pmc_writel(value, PMC_CNTRL); + break; + default: + return -EPROTONOSUPPORT; + } + + return -EINPROGRESS; +} + +static struct sysreset_ops tegra_sysreset = { + .request = tegra_sysreset_request, +}; + +U_BOOT_DRIVER(sysreset_tegra) = { + .id = UCLASS_SYSRESET, + .name = "sysreset_tegra", + .ops = &tegra_sysreset, +}; + +/* Link to Tegra PMC once there is a driver */ +U_BOOT_DRVINFO(sysreset_tegra) = { + .name = "sysreset_tegra" +};