[ARM] 3040/1: AAEC-2000 - Preliminary clock interface support

Patch from Bellido Nicolas

Here is a preliminary clock interface support for the AAEC-2000.

Signed-off-by: Nicolas Bellido <ml@acolin.be>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 134 insertions, 1 deletions

diff --git a/arch/arm/mach-aaec2000/Makefile b/arch/arm/mach-aaec2000/Makefile
index 20ec83896c37..a8e462f58bc9 100644
--- a/arch/arm/mach-aaec2000/Makefile
+++ b/arch/arm/mach-aaec2000/Makefile
@@ -3,7 +3,7 @@
 #
 
 # Common support (must be linked before board specific support)
-obj-y += core.o
+obj-y += core.o clock.o
 
 # Specific board support
 obj-$(CONFIG_MACH_AAED2000) += aaed2000.o
diff --git a/arch/arm/mach-aaec2000/clock.c b/arch/arm/mach-aaec2000/clock.c
new file mode 100644
index 000000000000..99e019169dda
--- /dev/null
+++ b/arch/arm/mach-aaec2000/clock.c
@@ -0,0 +1,110 @@
+/*
+ *  linux/arch/arm/mach-aaec2000/clock.c
+ *
+ *  Copyright (C) 2005 Nicolas Bellido Y Ortega
+ *
+ *  Based on linux/arch/arm/mach-integrator/clock.c
+ *
+ * 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/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+
+#include <asm/semaphore.h>
+#include <asm/hardware/clock.h>
+
+#include "clock.h"
+
+static LIST_HEAD(clocks);
+static DECLARE_MUTEX(clocks_sem);
+
+struct clk *clk_get(struct device *dev, const char *id)
+{
+        struct clk *p, *clk = ERR_PTR(-ENOENT);
+
+        down(&clocks_sem);
+        list_for_each_entry(p, &clocks, node) {
+                if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
+                        clk = p;
+                        break;
+                }
+        }
+        up(&clocks_sem);
+
+        return clk;
+}
+EXPORT_SYMBOL(clk_get);
+
+void clk_put(struct clk *clk)
+{
+        module_put(clk->owner);
+}
+EXPORT_SYMBOL(clk_put);
+
+int clk_enable(struct clk *clk)
+{
+        return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+}
+EXPORT_SYMBOL(clk_disable);
+
+int clk_use(struct clk *clk)
+{
+        return 0;
+}
+EXPORT_SYMBOL(clk_use);
+
+void clk_unuse(struct clk *clk)
+{
+}
+EXPORT_SYMBOL(clk_unuse);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+        return clk->rate;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+        return rate;
+}
+EXPORT_SYMBOL(clk_round_rate);
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+        return 0;
+}
+EXPORT_SYMBOL(clk_set_rate);
+
+int clk_register(struct clk *clk)
+{
+        down(&clocks_sem);
+        list_add(&clk->node, &clocks);
+        up(&clocks_sem);
+        return 0;
+}
+EXPORT_SYMBOL(clk_register);
+
+void clk_unregister(struct clk *clk)
+{
+        down(&clocks_sem);
+        list_del(&clk->node);
+        up(&clocks_sem);
+}
+EXPORT_SYMBOL(clk_unregister);
+
+static int __init clk_init(void)
+{
+        return 0;
+}
+arch_initcall(clk_init);
diff --git a/arch/arm/mach-aaec2000/clock.h b/arch/arm/mach-aaec2000/clock.h
new file mode 100644
index 000000000000..d4bb74ff613f
--- /dev/null
+++ b/arch/arm/mach-aaec2000/clock.h
@@ -0,0 +1,23 @@
+/*
+ *  linux/arch/arm/mach-aaec2000/clock.h
+ *
+ *  Copyright (C) 2005 Nicolas Bellido Y Ortega
+ *
+ *  Based on linux/arch/arm/mach-integrator/clock.h
+ *
+ * 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.
+ */
+struct module;
+
+struct clk {
+        struct list_head        node;
+        unsigned long           rate;
+        struct module           *owner;
+        const char              *name;
+        void                    *data;
+};
+
+int clk_register(struct clk *clk);
+void clk_unregister(struct clk *clk);