acpi_table_parse() will find table with table id and run handler
on it. So we use CLOCKSOURCE_ACPI_DECLARE to decalare timer tables
and glue its handler, then initialize them in clocksource_acpi_init().
Signed-off-by: Hanjun Guo <hanjun....@linaro.org>
Signed-off-by: Amit Daniel Kachhap <amit.dan...@samsung.com>
---
drivers/clocksource/Makefile | 1 +
drivers/clocksource/arm_arch_timer.c | 1 +
drivers/clocksource/clksrc-acpi.c | 36 ++++++++++++++++++++++++++++++++++
include/linux/clocksource.h | 3 +++
4 files changed, 41 insertions(+)
create mode 100644 drivers/clocksource/clksrc-acpi.c
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 33621ef..2304c99 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -1,4 +1,5 @@
obj-$(CONFIG_CLKSRC_OF) += clksrc-of.o
+obj-$(CONFIG_ACPI) += clksrc-acpi.o
obj-$(CONFIG_ATMEL_TCB_CLKSRC) += tcb_clksrc.o
obj-$(CONFIG_X86_CYCLONE_TIMER) += cyclone.o
obj-$(CONFIG_X86_PM_TIMER) += acpi_pm.o
diff --git a/drivers/clocksource/arm_arch_timer.c
b/drivers/clocksource/arm_arch_timer.c
index 1fa5f67..6489037 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -738,6 +738,7 @@ void __init arch_timer_acpi_init(struct acpi_table_header
*table)
arch_timers_present |= ARCH_CP15_TIMER;
arch_timer_init();
}
+CLOCKSOURCE_ACPI_DECLARE(armv8_arch_timer, "GTDT", arch_timer_acpi_init);
#endif
static void __init arch_timer_mem_init(struct device_node *np)
diff --git a/drivers/clocksource/clksrc-acpi.c
b/drivers/clocksource/clksrc-acpi.c
new file mode 100644
index 0000000..41efc83
--- /dev/null
+++ b/drivers/clocksource/clksrc-acpi.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2014, Hanjun Guo <hanjun....@linaro.org>
+ * Copyright (c) 2014, Amit Daniel Kachhap <amit.dan...@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/init.h>
+#include <linux/acpi.h>
+#include <linux/clocksource.h>
+
+extern struct acpi_device_id __clksrc_acpi_table[];
+
+static const struct acpi_device_id __clksrc_acpi_table_sentinel
+ __used __section(__clksrc_acpi_table_end);
+
+void __init clocksource_acpi_init(void)
+{
+ const struct acpi_device_id *id;
+ acpi_tbl_table_handler init_func;
+
+ for (id = __clksrc_acpi_table; id->id[0]; id++) {
+ init_func = (acpi_tbl_table_handler)id->driver_data;
+ acpi_table_parse(id->id, init_func);
+ }
+}
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 1d500cf..9bee8b3 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -361,12 +361,15 @@ static inline void clocksource_of_init(void) {}
#endif
#ifdef CONFIG_ACPI
+extern void clocksource_acpi_init(void);
+
#define CLOCKSOURCE_ACPI_DECLARE(name, compat, fn) \
static const struct acpi_device_id __clksrc_acpi_table_##name \
__used __section(__clksrc_acpi_table) \
= { .id = compat, \
.driver_data = (kernel_ulong_t)fn }
#else
+static inline void clocksource_acpi_init(void) { return; }
#define CLOCKSOURCE_ACPI_DECLARE(name, compat, fn)
#endif
--
1.7.9.5
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