linux-kernel - [RFC part1 PATCH 6/7] ARM64 / ACPI: Introduce lowlevel suspend function

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Message-Id: <1386088611-2801-7-git-send-email-hanjun.guo@linaro.org>
Date:	Wed,  4 Dec 2013 00:36:50 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Grant Likely <grant.likely@...aro.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Olof Johansson <olof@...om.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Mark Rutland <mark.rutland@....com>,
	Jon Masters <jonathan@...masters.org>, patches@...aro.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	linaro-acpi@...ts.linaro.org, Hanjun Guo <hanjun.guo@...aro.org>,
	Graeme Gregory <graeme.gregory@...aro.org>
Subject: [RFC part1 PATCH 6/7] ARM64 / ACPI: Introduce lowlevel suspend function

lowlevel suspend function is needed for ACPI based suspend/resume,
introduce ARM related lowlevel function in this patch.

Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
---
 arch/arm64/include/asm/acpi.h |    4 ++++
 drivers/acpi/plat/arm-core.c  |    7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index e9444e4..c830adc 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h
@@ -79,6 +79,10 @@ void arch_fix_phys_package_id(int num, u32 slot);
 /* temperally define -1 to make acpi core compilerable */
 #define cpu_physical_id(cpu) -1
 
+/* Low-level suspend routine. */
+extern int (*acpi_suspend_lowlevel)(void);
+#define acpi_wakeup_address (0)
+
 #else	/* !CONFIG_ACPI */
 #define acpi_disabled 1		/* ACPI sometimes enabled on ARM */
 #define acpi_noirq 1		/* ACPI sometimes enabled on ARM */
diff --git a/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c
index 7b8e64a..2b6df56 100644
--- a/drivers/acpi/plat/arm-core.c
+++ b/drivers/acpi/plat/arm-core.c
@@ -217,3 +217,10 @@ static int __init parse_acpi(char *arg)
 	return 0;
 }
 early_param("acpi", parse_acpi);
+
+/*
+ * acpi_suspend_lowlevel() - save kernel state and suspend.
+ *
+ * TBD when when ARM/ARM64 starts to support suspend...
+ */
+int (*acpi_suspend_lowlevel)(void);
-- 
1.7.9.5

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