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sysreset: psci: support system reset in a generic way with PSCI

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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>
This commit is contained in:
Masahiro Yamada 2017-04-14 11:10:24 +09:00 • committed by Tom Rini
parent c54bcf6805
commit 573a3811ed
12 changed files with 185 additions and 2 deletions
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13
include/linux/psci.h
View file

@ -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 */