arm: Add PSCI shutdown function

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 <[email protected]> Reviewed-by: Simon Glass <[email protected]>
imaami · Oct 18, 2016 · 3ee655e · 3ee655e
1 parent 51bfb5b
commit 3ee655e
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diff --git a/arch/arm/cpu/armv8/fwcall.c b/arch/arm/cpu/armv8/fwcall.c
@@ -97,3 +97,18 @@ void __noreturn psci_system_reset(void)
 	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)
+		;
+}
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
@@ -116,6 +116,7 @@ void flush_l3_cache(void);
 void smc_call(struct pt_regs *args);
 
 void __noreturn psci_system_reset(void);
+void __noreturn psci_system_off(void);
 
 #endif	/* __ASSEMBLY__ */