From 573a3811edc89c2ea3bf4fd077e3673b863b9a0d Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Fri, 14 Apr 2017 11:10:24 +0900 Subject: sysreset: psci: support system reset in a generic way with PSCI If the system is running PSCI firmware, the System Reset function (func ID: 0x80000009) is supposed to be handled by PSCI, that is, the SoC/board specific reset implementation should be moved to PSCI. U-Boot should call the PSCI service according to the arm-smccc manner. The arm-smccc is supported on ARMv7 or later. Especially, ARMv8 generation SoCs are likely to run ARM Trusted Firmware BL31. In this case, U-Boot is a non-secure world boot loader, so it should not be able to reset the system directly. Signed-off-by: Masahiro Yamada --- include/linux/psci.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'include/linux') diff --git a/include/linux/psci.h b/include/linux/psci.h index 310d83e0a9..8d13bd2702 100644 --- a/include/linux/psci.h +++ b/include/linux/psci.h @@ -87,4 +87,17 @@ #define PSCI_RET_NOT_PRESENT -7 #define PSCI_RET_DISABLED -8 +#ifdef CONFIG_ARM_PSCI_FW +typedef unsigned long (psci_fn)(unsigned long, unsigned long, + unsigned long, unsigned long); + +extern psci_fn *invoke_psci_fn; +#else +unsigned long invoke_psci_fn(unsigned long a0, unsigned long a1, + unsigned long a2, unsigned long a3) +{ + return PSCI_RET_DISABLED; +} +#endif + #endif /* _UAPI_LINUX_PSCI_H */ -- cgit v1.2.3