diff options
| author | Patrick Delaunay <patrick.delaunay@st.com> | 2018-04-16 10:13:22 +0200 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2018-05-07 11:45:15 -0400 |
| commit | 1a047c23f9e5e7f498cc3ca759725ae7b6c6a6b9 (patch) | |
| tree | 724a4227f6b9be80c08f8e1315c4f3da697f5496 /arch/arm/cpu | |
| parent | 890e79f2b1c26c5ba1a86d179706348aec7feef7 (diff) | |
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>
Diffstat (limited to 'arch/arm/cpu')
| -rw-r--r-- | arch/arm/cpu/armv7/psci-common.c | 14 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/psci.S | 4 |
2 files changed, 18 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/psci-common.c b/arch/arm/cpu/armv7/psci-common.c index 8cb4107be6..73f986bf72 100644 --- a/arch/arm/cpu/armv7/psci-common.c +++ b/arch/arm/cpu/armv7/psci-common.c @@ -25,10 +25,19 @@ #include <linux/linkage.h> static u32 psci_target_pc[CONFIG_ARMV7_PSCI_NR_CPUS] __secure_data = { 0 }; +static u32 psci_context_id[CONFIG_ARMV7_PSCI_NR_CPUS] __secure_data = { 0 }; void __secure psci_save_target_pc(int cpu, u32 pc) { psci_target_pc[cpu] = pc; + psci_context_id[cpu] = 0; + dsb(); +} + +void __secure psci_save(int cpu, u32 pc, u32 context_id) +{ + psci_target_pc[cpu] = pc; + psci_context_id[cpu] = context_id; dsb(); } @@ -37,3 +46,8 @@ u32 __secure psci_get_target_pc(int cpu) return psci_target_pc[cpu]; } +u32 __secure psci_get_context_id(int cpu) +{ + return psci_context_id[cpu]; +} + diff --git a/arch/arm/cpu/armv7/psci.S b/arch/arm/cpu/armv7/psci.S index 95b962dadf..35fd95576a 100644 --- a/arch/arm/cpu/armv7/psci.S +++ b/arch/arm/cpu/armv7/psci.S @@ -327,6 +327,10 @@ ENTRY(psci_cpu_entry) bl _nonsec_init bl psci_get_cpu_id @ CPU ID => r0 + mov r2, r0 @ CPU ID => r2 + bl psci_get_context_id @ context id => r0 + mov r1, r0 @ context id => r1 + mov r0, r2 @ CPU ID => r0 bl psci_get_target_pc @ target PC => r0 b _do_nonsec_entry ENDPROC(psci_cpu_entry) |