From: Graeme Gregory graeme.gregory@linaro.org
acpi_wakeup_address is used on x86 as the address bios jumps into when machine wakes up from suspend. As arm64 does not have such a bios this mechanism will be provided by other means. But the define is still required inside the acpi core.
Introduce a null stub for acpi_suspend_lowlevel as this is also required by core. This will be filled in when standards are defined for arm64 ACPI global power states.
Signed-off-by: Graeme Gregory graeme.gregory@linaro.org Signed-off-by: Hanjun Guo hanjun.guo@linaro.org --- arch/arm64/include/asm/acpi.h | 12 ++++++++++++ arch/arm64/kernel/acpi.c | 7 +++++++ 2 files changed, 19 insertions(+)
diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h index 8b837ab..02bbb0b 100644 --- a/arch/arm64/include/asm/acpi.h +++ b/arch/arm64/include/asm/acpi.h @@ -40,6 +40,18 @@ static inline bool acpi_has_cpu_in_madt(void)
static inline void arch_fix_phys_package_id(int num, u32 slot) { }
+/* Low-level suspend routine. + * + * ACPI S-states for ARM64 have to be defined + * and approved before doing anything else, maybe + * we need update the ACPI spec, here we + * just introduce function and macro needed by + * ACPI core as IA64 did, and revisit them when + * the spec is ready. + */ +extern int (*acpi_suspend_lowlevel)(void); +#define acpi_wakeup_address 0 + #endif /* CONFIG_ACPI */
#endif /*_ASM_ACPI_H*/ diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c index 9252f72..b6940a0 100644 --- a/arch/arm64/kernel/acpi.c +++ b/arch/arm64/kernel/acpi.c @@ -67,3 +67,10 @@ void __init acpi_boot_table_init(void) if (acpi_table_init()) disable_acpi(); } + +/* + * acpi_suspend_lowlevel() - save kernel state and suspend. + * + * TBD when ARM/ARM64 starts to support suspend... + */ +int (*acpi_suspend_lowlevel)(void) = NULL;