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133 lines
4.2 KiB
133 lines
4.2 KiB
11 years ago
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From 517d8e6ba345620c6704ec3db5b23c56fde06392 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Thu, 20 Jun 2013 19:16:03 +0200
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Subject: [PATCH 77/79] clocksource: add common of_clksrc_init() function
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It is desirable to move all clocksource drivers to drivers/clocksource,
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yet each requires its own initialization function. We'd rather not
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pollute <linux/> with a header for each function. Instead, create a
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single of_clksrc_init() function which will determine which clocksource
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driver to initialize based on device tree.
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Based on a similar patch for drivers/irqchip by Thomas Petazzoni.
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Signed-off-by: Stephen Warren <swarren@nvidia.com>
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---
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drivers/clocksource/Kconfig | 3 +++
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drivers/clocksource/Makefile | 1 +
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drivers/clocksource/clksrc-of.c | 35 +++++++++++++++++++++++++++++++++++
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include/asm-generic/vmlinux.lds.h | 9 +++++++++
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include/linux/clocksource.h | 9 +++++++++
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5 files changed, 57 insertions(+)
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create mode 100644 drivers/clocksource/clksrc-of.c
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diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
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index 7fdcbd3..a32b7a9 100644
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--- a/drivers/clocksource/Kconfig
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+++ b/drivers/clocksource/Kconfig
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@@ -1,3 +1,6 @@
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+config CLKSRC_OF
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+ bool
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+
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config CLKSRC_I8253
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bool
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diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
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index f93453d..a33f792 100644
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--- a/drivers/clocksource/Makefile
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+++ b/drivers/clocksource/Makefile
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@@ -1,3 +1,4 @@
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+obj-$(CONFIG_CLKSRC_OF) += clksrc-of.o
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obj-$(CONFIG_ATMEL_TCB_CLKSRC) += tcb_clksrc.o
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obj-$(CONFIG_X86_CYCLONE_TIMER) += cyclone.o
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obj-$(CONFIG_X86_PM_TIMER) += acpi_pm.o
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diff --git a/drivers/clocksource/clksrc-of.c b/drivers/clocksource/clksrc-of.c
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new file mode 100644
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index 0000000..bdabdaa
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--- /dev/null
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+++ b/drivers/clocksource/clksrc-of.c
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@@ -0,0 +1,35 @@
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+/*
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+ * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms and conditions of the GNU General Public License,
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+ * version 2, as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope it will be useful, but WITHOUT
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+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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+ * more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ */
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+
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+#include <linux/init.h>
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+#include <linux/of.h>
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+
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+extern struct of_device_id __clksrc_of_table[];
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+
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+static const struct of_device_id __clksrc_of_table_sentinel
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+ __used __section(__clksrc_of_table_end);
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+
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+void __init clocksource_of_init(void)
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+{
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+ struct device_node *np;
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+ const struct of_device_id *match;
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+ void (*init_func)(void);
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+
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+ for_each_matching_node_and_match(np, __clksrc_of_table, &match) {
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+ init_func = match->data;
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+ init_func();
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+ }
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+}
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diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
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index d1ea7ce..1e744c5 100644
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--- a/include/asm-generic/vmlinux.lds.h
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+++ b/include/asm-generic/vmlinux.lds.h
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@@ -149,6 +149,14 @@
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#define TRACE_SYSCALLS()
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#endif
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+#ifdef CONFIG_CLKSRC_OF
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+#define CLKSRC_OF_TABLES() . = ALIGN(8); \
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+ VMLINUX_SYMBOL(__clksrc_of_table) = .; \
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+ *(__clksrc_of_table) \
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+ *(__clksrc_of_table_end)
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+#else
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+#define CLKSRC_OF_TABLES()
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+#endif
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#define KERNEL_DTB() \
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STRUCT_ALIGN(); \
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@@ -493,6 +501,7 @@
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DEV_DISCARD(init.rodata) \
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CPU_DISCARD(init.rodata) \
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MEM_DISCARD(init.rodata) \
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+ CLKSRC_OF_TABLES() \
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KERNEL_DTB()
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#define INIT_TEXT \
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diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
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index 4dceaf8..7944f14 100644
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--- a/include/linux/clocksource.h
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+++ b/include/linux/clocksource.h
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@@ -332,4 +332,13 @@ extern int clocksource_mmio_init(void __iomem *, const char *,
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extern int clocksource_i8253_init(void);
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+#ifdef CONFIG_CLKSRC_OF
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+extern void clocksource_of_init(void);
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+
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+#define CLOCKSOURCE_OF_DECLARE(name, compat, fn) \
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+ static const struct of_device_id __clksrc_of_table_##name \
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+ __used __section(__clksrc_of_table) \
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+ = { .compatible = compat, .data = fn };
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+#endif
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+
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#endif /* _LINUX_CLOCKSOURCE_H */
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--
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1.7.10.4
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