[PATCH v7 03/17] ARM64 / ACPI: Introduce sleep-arm.c

Hanjun Guo
2015-01-14T15:04:51Z

From: Graeme Gregory <graeme.gregory@linaro.org>

ACPI 5.1 does not currently support S states for ARM64 hardware but
ACPI code will call acpi_target_system_state() for device power
managment, so introduce sleep-arm.c to allow other drivers to function
until S states are defined.

Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Tomasz Nowicki <tomasz.nowicki@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
drivers/acpi/Makefile | 4 ++++
drivers/acpi/sleep-arm.c | 28 ++++++++++++++++++++++++++++
2 files changed, 32 insertions(+)
create mode 100644 drivers/acpi/sleep-arm.c

diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index f74317c..39f3ec1 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -23,7 +23,11 @@ acpi-y += nvs.o

# Power management related files
acpi-y += wakeup.o
+ifeq ($(ARCH), arm64)
+acpi-y += sleep-arm.o
+else # X86, IA64
acpi-y += sleep.o
+endif
acpi-y += device_pm.o
acpi-$(CONFIG_ACPI_SLEEP) += proc.o

diff --git a/drivers/acpi/sleep-arm.c b/drivers/acpi/sleep-arm.c
new file mode 100644
index 0000000..54578ef
--- /dev/null
+++ b/drivers/acpi/sleep-arm.c
@@ -0,0 +1,28 @@
+/*
+ * ARM64 Specific Sleep Functionality
+ *
+ * Copyright (C) 2013-2014, Linaro Ltd.
+ * Author: Graeme Gregory <graeme.gregory@linaro.org>
+ *
+ * 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;
+}
--
1.9.1