This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / avr32 / mach-at32ap / clock.c

diff --git a/arch/avr32/mach-at32ap/clock.c b/arch/avr32/mach-at32ap/clock.c
new file mode 100644 (file)
index 0000000..3d0d109
--- /dev/null
+++ b/arch/avr32/mach-at32ap/clock.c
@@ -0,0 +1,148 @@
+/*
+ * Clock management for AT32AP CPUs
+ *
+ * Copyright (C) 2006 Atmel Corporation
+ *
+ * Based on arch/arm/mach-at91rm9200/clock.c
+ *   Copyright (C) 2005 David Brownell
+ *   Copyright (C) 2005 Ivan Kokshaysky
+ *
+ * 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/clk.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/string.h>
+
+#include "clock.h"
+
+static spinlock_t clk_lock = SPIN_LOCK_UNLOCKED;
+
+struct clk *clk_get(struct device *dev, const char *id)
+{
+       int i;
+
+       for (i = 0; i < at32_nr_clocks; i++) {
+               struct clk *clk = at32_clock_list[i];
+
+               if (clk->dev == dev && strcmp(id, clk->name) == 0)
+                       return clk;
+       }
+
+       return ERR_PTR(-ENOENT);
+}
+EXPORT_SYMBOL(clk_get);
+
+void clk_put(struct clk *clk)
+{
+       /* clocks are static for now, we can't free them */
+}
+EXPORT_SYMBOL(clk_put);
+
+static void __clk_enable(struct clk *clk)
+{
+       if (clk->parent)
+               __clk_enable(clk->parent);
+       if (clk->users++ == 0 && clk->mode)
+               clk->mode(clk, 1);
+}
+
+int clk_enable(struct clk *clk)
+{
+       unsigned long flags;
+
+       spin_lock_irqsave(&clk_lock, flags);
+       __clk_enable(clk);
+       spin_unlock_irqrestore(&clk_lock, flags);
+
+       return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+static void __clk_disable(struct clk *clk)
+{
+       BUG_ON(clk->users == 0);
+
+       if (--clk->users == 0 && clk->mode)
+               clk->mode(clk, 0);
+       if (clk->parent)
+               __clk_disable(clk->parent);
+}
+
+void clk_disable(struct clk *clk)
+{
+       unsigned long flags;
+
+       spin_lock_irqsave(&clk_lock, flags);
+       __clk_disable(clk);
+       spin_unlock_irqrestore(&clk_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+       unsigned long flags;
+       unsigned long rate;
+
+       spin_lock_irqsave(&clk_lock, flags);
+       rate = clk->get_rate(clk);
+       spin_unlock_irqrestore(&clk_lock, flags);
+
+       return rate;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+       unsigned long flags, actual_rate;
+
+       if (!clk->set_rate)
+               return -ENOSYS;
+
+       spin_lock_irqsave(&clk_lock, flags);
+       actual_rate = clk->set_rate(clk, rate, 0);
+       spin_unlock_irqrestore(&clk_lock, flags);
+
+       return actual_rate;
+}
+EXPORT_SYMBOL(clk_round_rate);
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+       unsigned long flags;
+       long ret;
+
+       if (!clk->set_rate)
+               return -ENOSYS;
+
+       spin_lock_irqsave(&clk_lock, flags);
+       ret = clk->set_rate(clk, rate, 1);
+       spin_unlock_irqrestore(&clk_lock, flags);
+
+       return (ret < 0) ? ret : 0;
+}
+EXPORT_SYMBOL(clk_set_rate);
+
+int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+       unsigned long flags;
+       int ret;
+
+       if (!clk->set_parent)
+               return -ENOSYS;
+
+       spin_lock_irqsave(&clk_lock, flags);
+       ret = clk->set_parent(clk, parent);
+       spin_unlock_irqrestore(&clk_lock, flags);
+
+       return ret;
+}
+EXPORT_SYMBOL(clk_set_parent);
+
+struct clk *clk_get_parent(struct clk *clk)
+{
+       return clk->parent;
+}
+EXPORT_SYMBOL(clk_get_parent);