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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>
This commit is contained in:
Lorenzo Pieralisi 2015-05-26 16:49:01 +01:00
parent 2217d7c68e
commit 068654c200
3 changed files with 17 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
arch/arm64/kernel/psci.c
View File

@ -30,20 +30,6 @@
#include <asm/smp_plat.h>
#include <asm/suspend.h>
static bool psci_power_state_loses_context(u32 state)
{
return state & PSCI_0_2_POWER_STATE_TYPE_MASK;
}
static bool psci_power_state_is_valid(u32 state)
{
const u32 valid_mask = PSCI_0_2_POWER_STATE_ID_MASK |
PSCI_0_2_POWER_STATE_TYPE_MASK |
PSCI_0_2_POWER_STATE_AFFL_MASK;
return !(state & ~valid_mask);
}
static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_power_state);
static int __maybe_unused cpu_psci_cpu_init_idle(unsigned int cpu)

15
drivers/firmware/psci.c
View File

@ -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) {

2
include/linux/psci.h
View File

@ -21,6 +21,8 @@
#define PSCI_POWER_STATE_TYPE_POWER_DOWN 1
bool psci_tos_resident_on(int cpu);
bool psci_power_state_loses_context(u32 state);
bool psci_power_state_is_valid(u32 state);
struct psci_operations {
int (*cpu_suspend)(u32 state, unsigned long entry_point);