commit 467c83e176b5e5b2741c485fef9bd3fa86d8296c
author Alexander Graf <agraf@suse.de> Tue Aug 16 21:08:47 2016 +0200
committer Alexander Graf <agraf@suse.de> Tue Oct 18 09:08:08 2016 +0200
tree bb700ca0e2c742b2f2422a47ff7aa8b27e05c307
parent a5b1832e1d1d5f917fd6971478bf2e0d05bd868a

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 <agraf@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/cpu/armv8/fwcall.c

diff --git a/arch/arm/cpu/armv8/fwcall.c b/arch/arm/cpu/armv8/fwcall.c
index 6bb68f2..b3ef7c0 100644
--- a/arch/arm/cpu/armv8/fwcall.c
+++ b/arch/arm/cpu/armv8/fwcall.c
@@ -97,3 +97,18 @@
 	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)
+		;
+}

arch/arm/include/asm/system.h

diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 5166c65..b928bd8 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -116,6 +116,7 @@
 void smc_call(struct pt_regs *args);
 
 void __noreturn psci_system_reset(void);
+void __noreturn psci_system_off(void);
 
 #endif	/* __ASSEMBLY__ */