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-rw-r--r--arch/arm/plat-s5pc1xx/include/plat/pll.h38
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/arm/plat-s5pc1xx/include/plat/pll.h b/arch/arm/plat-s5pc1xx/include/plat/pll.h
new file mode 100644
index 000000000000..21afef1573e7
--- /dev/null
+++ b/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;
+}
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