summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-w90x900/clock.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-w90x900/clock.c')
-rw-r--r--arch/arm/mach-w90x900/clock.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/arm/mach-w90x900/clock.c b/arch/arm/mach-w90x900/clock.c
new file mode 100644
index 0000000..f420613
--- /dev/null
+++ b/arch/arm/mach-w90x900/clock.c
@@ -0,0 +1,77 @@
+/*
+ * linux/arch/arm/mach-w90x900/clock.c
+ *
+ * Copyright (c) 2008 Nuvoton technology corporation
+ *
+ * Wan ZongShun <mcuos.com@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/clk.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+
+#include "clock.h"
+
+static DEFINE_SPINLOCK(clocks_lock);
+
+int clk_enable(struct clk *clk)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&clocks_lock, flags);
+ if (clk->enabled++ == 0)
+ (clk->enable)(clk, 1);
+ spin_unlock_irqrestore(&clocks_lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+ unsigned long flags;
+
+ WARN_ON(clk->enabled == 0);
+
+ spin_lock_irqsave(&clocks_lock, flags);
+ if (--clk->enabled == 0)
+ (clk->enable)(clk, 0);
+ spin_unlock_irqrestore(&clocks_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+void w90x900_clk_enable(struct clk *clk, int enable)
+{
+ unsigned int clocks = clk->cken;
+ unsigned long clken;
+
+ clken = __raw_readl(W90X900_VA_CLKPWR);
+
+ if (enable)
+ clken |= clocks;
+ else
+ clken &= ~clocks;
+
+ __raw_writel(clken, W90X900_VA_CLKPWR);
+}
+
+void clks_register(struct clk_lookup *clks, size_t num)
+{
+ int i;
+
+ for (i = 0; i < num; i++)
+ clkdev_add(&clks[i]);
+}
OpenPOWER on IntegriCloud