The _PDC (Processor Driver Capabilities) object provides OSPM a mechanism to convey to the platform the capabilities supported by OSPM for processor power management.
OSPM evaluates _PDC prior to evaluating any other processor power management objects returning configuration information.
This patch introduces the skeleton of _PDC related file to make ACPI core can be compiled on ARM64, and should be revisited when implementing CPU power control.
Signed-off-by: Al Stone al.stone@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 | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 arch/arm64/include/asm/acpi.h
diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h new file mode 100644 index 0000000..e3e990e --- /dev/null +++ b/arch/arm64/include/asm/acpi.h @@ -0,0 +1,37 @@ +/* + * Copyright (C) 2013~2014, Al Stone al.stone@linaro.org + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + */ + +#ifndef _ASM_ACPI_H +#define _ASM_ACPI_H + +static inline bool arch_has_acpi_pdc(void) +{ + /* + * Always false for now, should be revisited when + * implementing CPU power management + */ + return false; +} + +static inline void arch_acpi_set_pdc_bits(u32 *buf) +{ + /* Should be revisited when implementing CPU power management */ + return; +} + +#endif /*_ASM_ACPI_H*/