ARM: S5PC100: Clock and PLL support

S5PC100 has 4 PLLs (APLL,MPLL,EPLL,HPLL) and 3 clock domains. Clock scheme is
implemented here.

Signed-off-by: Byungho Min <bhmin@samsung.com>
[ben-linux@fluff.org: edited title]
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

arch/arm/plat-s5pc1xx/include/plat/pll.h

@@ -0,0 +1,38 @@
+/* arch/arm/plat-s5pc1xx/include/plat/pll.h
+ *
+ * Copyright 2009 Samsung Electronics Co.
+ *	Byungho Min <bhmin@samsung.com>
+ *
+ * S5PC1XX PLL code
+ *
+ * Based on plat-s3c64xx/include/plat/pll.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.
+*/
+
+#define S5P_PLL_MDIV_MASK	((1 << (25-16+1)) - 1)
+#define S5P_PLL_PDIV_MASK	((1 << (13-8+1)) - 1)
+#define S5P_PLL_SDIV_MASK	((1 << (2-0+1)) - 1)
+#define S5P_PLL_MDIV_SHIFT	(16)
+#define S5P_PLL_PDIV_SHIFT	(8)
+#define S5P_PLL_SDIV_SHIFT	(0)
+
+#include <asm/div64.h>
+
+static inline unsigned long s5pc1xx_get_pll(unsigned long baseclk,
+					    u32 pllcon)
+{
+	u32 mdiv, pdiv, sdiv;
+	u64 fvco = baseclk;
+
+	mdiv = (pllcon >> S5P_PLL_MDIV_SHIFT) & S5P_PLL_MDIV_MASK;
+	pdiv = (pllcon >> S5P_PLL_PDIV_SHIFT) & S5P_PLL_PDIV_MASK;
+	sdiv = (pllcon >> S5P_PLL_SDIV_SHIFT) & S5P_PLL_SDIV_MASK;
+
+	fvco *= mdiv;
+	do_div(fvco, (pdiv << sdiv));
+
+	return (unsigned long)fvco;
+}