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[RFC,part1,4/7] ARM64 / ACPI: Introduce the skeleton of _PDC related for ARM64

Message ID 1386088611-2801-5-git-send-email-hanjun.guo@linaro.org
State New
Headers show

Commit Message

Hanjun Guo Dec. 3, 2013, 4:36 p.m. UTC 
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.

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      |   32 ++++++++++++++++++++++++++++++++
 arch/arm64/include/asm/processor.h |   11 +++++++++++
 arch/arm64/kernel/process.c        |    5 +++++
 3 files changed, 48 insertions(+)
 create mode 100644 arch/arm64/include/asm/acpi.h

Comments

Alan Cox Dec. 3, 2013, 4:53 p.m. UTC | #1 
O> +enum idle_boot_override { IDLE_NO_OVERRIDE = 0, IDLE_HALT, IDLE_NOMWAIT,
> +			IDLE_POLL, IDLE_FORCE_MWAIT };

This should probably move out of the arch directory to be a single enum
including both platforms values. That will make it rather easier to keep
sane and avoid ifdefs around which definitions are for which processor.
Hanjun Guo Dec. 4, 2013, 2:17 p.m. UTC | #2 
On 2013年12月04日 00:53, One Thousand Gnomes wrote:
> O> +enum idle_boot_override { IDLE_NO_OVERRIDE = 0, IDLE_HALT, IDLE_NOMWAIT,
>> +			IDLE_POLL, IDLE_FORCE_MWAIT };
> This should probably move out of the arch directory to be a single enum
> including both platforms values. That will make it rather easier to keep
> sane and avoid ifdefs around which definitions are for which processor.

Thank you very much for the suggestion, it makes sense to me, will figure
out how to implement it.

Thanks
Hanjun
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Patch

diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
new file mode 100644
index 0000000..c186f5b
--- /dev/null
+++ b/arch/arm64/include/asm/acpi.h
@@ -0,0 +1,32 @@ 
+/*
+ *  Copyright (C) 2013, 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_ARM_ACPI_H
+#define _ASM_ARM_ACPI_H
+
+static inline bool arch_has_acpi_pdc(void)
+{
+	return false;	/* always false for now */
+}
+
+static inline void arch_acpi_set_pdc_bits(u32 *buf)
+{
+	return;
+}
+
+#endif /*_ASM_ARM_ACPI_H*/
diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
index 45b20cd..73b1d3a 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -162,6 +162,17 @@  static inline void spin_lock_prefetch(const void *x)
 
 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 
+#ifdef CONFIG_ACPI
+/*
+ * FIXME: there is no MWAIT on ARM, should be WFI or something else,
+ * and modify drivers/acpi/processor_core.c too.
+ */
+enum idle_boot_override { IDLE_NO_OVERRIDE = 0, IDLE_HALT, IDLE_NOMWAIT,
+			IDLE_POLL, IDLE_FORCE_MWAIT };
+
+extern unsigned long    boot_option_idle_override;
+#endif
+
 #endif
 
 #endif /* __ASM_PROCESSOR_H */
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index de17c89..2cd4182 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -347,3 +347,8 @@  unsigned long randomize_et_dyn(unsigned long base)
 {
 	return randomize_base(base);
 }
+
+#ifdef CONFIG_ACPI
+unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;
+EXPORT_SYMBOL(boot_option_idle_override);
+#endif