[ARM] Add support for ARM RealView board

[pandora-kernel.git] / arch / arm / mach-realview / clock.c

diff --git a/arch/arm/mach-realview/clock.c b/arch/arm/mach-realview/clock.c
new file mode 100644 (file)
index 0000000..002635c
--- /dev/null
+++ b/arch/arm/mach-realview/clock.c
@@ -0,0 +1,145 @@
+/*
+ *  linux/arch/arm/mach-realview/clock.c
+ *
+ *  Copyright (C) 2004 ARM Limited.
+ *  Written by Deep Blue Solutions Limited.
+ *
+ * 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 <asm/hardware/icst307.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)
+{
+       int ret = -EIO;
+
+       if (clk->setvco) {
+               struct icst307_vco vco;
+
+               vco = icst307_khz_to_vco(clk->params, rate / 1000);
+               clk->rate = icst307_khz(clk->params, vco) * 1000;
+
+               printk("Clock %s: setting VCO reg params: S=%d R=%d V=%d\n",
+                       clk->name, vco.s, vco.r, vco.v);
+
+               clk->setvco(clk, vco);
+               ret = 0;
+       }
+       return ret;
+}
+EXPORT_SYMBOL(clk_set_rate);
+
+/*
+ * These are fixed clocks.
+ */
+static struct clk kmi_clk = {
+       .name   = "KMIREFCLK",
+       .rate   = 24000000,
+};
+
+static struct clk uart_clk = {
+       .name   = "UARTCLK",
+       .rate   = 24000000,
+};
+
+static struct clk mmci_clk = {
+       .name   = "MCLK",
+       .rate   = 33000000,
+};
+
+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)
+{
+       clk_register(&kmi_clk);
+       clk_register(&uart_clk);
+       clk_register(&mmci_clk);
+       return 0;
+}
+arch_initcall(clk_init);