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 <yamada.masahiro@socionext.com>
diff --git a/include/linux/psci.h b/include/linux/psci.h
index 310d83e..8d13bd2 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 */