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.
Reviewed-by: Grant Likely grant.likely@linaro.org 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 ++++++++++++ drivers/acpi/plat/arm-core.c | 7 +++++++ 2 files changed, 19 insertions(+)
diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h index 3ea6b84..a93e8ae 100644 --- a/arch/arm64/include/asm/acpi.h +++ b/arch/arm64/include/asm/acpi.h @@ -39,6 +39,18 @@ static inline void disable_acpi(void) */ #define cpu_physical_id(cpu) -1
+/* + * 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 just we + * just introduce function and macro needed by + * ACPI core, and revisit them when the spec is ready. + */ +extern int (*acpi_suspend_lowlevel)(void); +#define acpi_wakeup_address (0) + static inline bool acpi_arch_is_smp(void) { return 1; diff --git a/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c index cf46c25..0155a98 100644 --- a/drivers/acpi/plat/arm-core.c +++ b/drivers/acpi/plat/arm-core.c @@ -129,3 +129,10 @@ static int __init parse_acpi(char *arg) return 0; } early_param("acpi", parse_acpi); + +/* + * acpi_suspend_lowlevel() - save kernel state and suspend. + * + * TBD when ARM/ARM64 starts to support suspend... + */ +int (*acpi_suspend_lowlevel)(void);