arm: psci: save context id for cpu_on PSCI command
Save and use the 3rd parameter of PSCI CPU_ON request: context_id.
The context_id parameter is only meaningful to the caller.
U-Boot PSCI preserves a copy of the value passed in this parameter.
Following wakeup from a powerdown state, U-BOOT PSCI places
this value in R0 when it first enters the OS.
NB: this context id is not (yet?) used by Linux but it is mandatory
to be PSCI compliant.
update armv7 psci functions:
- psci_save_target_pc(): keep for backward compatibility with
current platform (only save PC and force context id to 0)
=> should be removed when all platform migrate to the new API
- psci_save(): new API to use by ARMv7 platform with PSCI,
save pc (= entry_point_address) and context_id
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/include/asm/psci.h b/arch/arm/include/asm/psci.h
index ac8b00d..b415241 100644
--- a/arch/arm/include/asm/psci.h
+++ b/arch/arm/include/asm/psci.h
@@ -93,9 +93,11 @@
#ifndef __ASSEMBLY__
#include <asm/types.h>
-/* These 2 helper functions assume cpu < CONFIG_ARMV7_PSCI_NR_CPUS */
+/* These 4 helper functions assume cpu < CONFIG_ARMV7_PSCI_NR_CPUS */
u32 psci_get_target_pc(int cpu);
+u32 psci_get_context_id(int cpu);
void psci_save_target_pc(int cpu, u32 pc);
+void psci_save(int cpu, u32 pc, u32 context_id);
void psci_cpu_entry(void);
u32 psci_get_cpu_id(void);