From: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
ACPI 5.1 does not currently support S states for ARM64 hardware but
ACPI code will call acpi_target_system_state() for device power
management, so introduce acpi_sleep.c to allow other drivers to function
until S states are defined.
Since it is arm64 specific stub holder, so let acpi_sleep.c to ARM64
specific.
TODO: merge this with drivers/acpi/sleep.c once we fix the specification.
CC: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
Tested-by: Yijing Wang <wangyijing@xxxxxxxxxx>
Tested-by: Mark Langsdorf <mlangsdo@xxxxxxxxxx>
Tested-by: Jon Masters <jcm@xxxxxxxxxx>
Tested-by: Timur Tabi <timur@xxxxxxxxxxxxxx>
Tested-by: Robert Richter <rrichter@xxxxxxxxxx>
Acked-by: Robert Richter <rrichter@xxxxxxxxxx>
Signed-off-by: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
Signed-off-by: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx>
Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
---
arch/arm64/kernel/Makefile | 2 +-
arch/arm64/kernel/acpi_sleep.c | 28 ++++++++++++++++++++++++++++
drivers/acpi/Makefile | 2 ++
3 files changed, 31 insertions(+), 1 deletion(-)
create mode 100644 arch/arm64/kernel/acpi_sleep.c
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 218eb7e..4435943 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -34,7 +34,7 @@ arm64-obj-$(CONFIG_KGDB) += kgdb.o
arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o
arm64-obj-$(CONFIG_PCI) += pci.o
arm64-obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o
-arm64-obj-$(CONFIG_ACPI) += acpi.o
+arm64-obj-$(CONFIG_ACPI) += acpi.o acpi_sleep.o
obj-y += $(arm64-obj-y) vdso/
obj-m += $(arm64-obj-m)
diff --git a/arch/arm64/kernel/acpi_sleep.c b/arch/arm64/kernel/acpi_sleep.c
new file mode 100644
index 0000000..54578ef
--- /dev/null
+++ b/arch/arm64/kernel/acpi_sleep.c
@@ -0,0 +1,28 @@
+/*
+ * ARM64 Specific Sleep Functionality
+ *
+ * Copyright (C) 2013-2014, Linaro Ltd.
+ * Author: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/acpi.h>
+
+/*
+ * Currently the ACPI 5.1 standard does not define S states in a
+ * manner which is usable for ARM64. These two stubs are sufficient
+ * that system initialises and device PM works.
+ */
+u32 acpi_target_system_state(void)
+{
+ return ACPI_STATE_S0;
+}
+EXPORT_SYMBOL_GPL(acpi_target_system_state);
+
+int __init acpi_sleep_init(void)
+{
+ return -ENOSYS;
+}
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 623b117..c32edf5 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -23,7 +23,9 @@ acpi-y += nvs.o
# Power management related files
acpi-y += wakeup.o
+ifneq (,$(findstring $(ARCH),x86 ia64))
acpi-y += sleep.o
+endif
acpi-y += device_pm.o
acpi-$(CONFIG_ACPI_SLEEP) += proc.o
--
1.9.1
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