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arm: Add PSCI shutdown function

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Using PSCI you can not only reset the system, you can also shut it down!
This patch exposes a function to do exactly that to whatever code wants
to make use of it.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Alexander Graf 2016-08-16 21:08:47 +02:00
parent 51bfb5b6f5
commit 3ee655ed83
2 changed files with 16 additions and 0 deletions
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15
arch/arm/cpu/armv8/fwcall.c
View file

@ -97,3 +97,18 @@ void __noreturn psci_system_reset(void)
while (1) while (1)
; ;
} }
void __noreturn psci_system_off(void)
{
struct pt_regs regs;
regs.regs[0] = ARM_PSCI_0_2_FN_SYSTEM_OFF;
if (use_smc_for_psci)
smc_call(&regs);
else
hvc_call(&regs);
while (1)
;
}

1
arch/arm/include/asm/system.h
View file

@ -116,6 +116,7 @@ void flush_l3_cache(void);
void smc_call(struct pt_regs *args); void smc_call(struct pt_regs *args);
void __noreturn psci_system_reset(void); void __noreturn psci_system_reset(void);
void __noreturn psci_system_off(void);
#endif /* __ASSEMBLY__ */ #endif /* __ASSEMBLY__ */