drivers: firmware: psci: move power_state handling to generic code

Functions implemented on arm64 to check if a power_state parameter
is valid and if the power_state implies context loss are not
arm64 specific and should be moved to generic code so that they
can be reused on arm systems too.

This patch moves the functions handling the power_state parameter
to generic PSCI firmware layer code.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Tested-by: Jisheng Zhang <jszhang@marvell.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
index 0821e332c85a..3157eb0ef300 100644
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -70,6 +70,21 @@ enum psci_function {
 
 static u32 psci_function_id[PSCI_FN_MAX];
 
+#define PSCI_0_2_POWER_STATE_MASK               \
+                                (PSCI_0_2_POWER_STATE_ID_MASK | \
+                                PSCI_0_2_POWER_STATE_TYPE_MASK | \
+                                PSCI_0_2_POWER_STATE_AFFL_MASK)
+
+bool psci_power_state_loses_context(u32 state)
+{
+        return state & PSCI_0_2_POWER_STATE_TYPE_MASK;
+}
+
+bool psci_power_state_is_valid(u32 state)
+{
+        return !(state & ~PSCI_0_2_POWER_STATE_MASK);
+}
+
 static int psci_to_linux_errno(int errno)
 {
         switch (errno) {