aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/plat-s5p/include/plat/pll.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/plat-s5p/include/plat/pll.h')
-rw-r--r--arch/arm/plat-s5p/include/plat/pll.h83
1 files changed, 83 insertions, 0 deletions
diff --git a/arch/arm/plat-s5p/include/plat/pll.h b/arch/arm/plat-s5p/include/plat/pll.h
new file mode 100644
index 00000000000..d48325bb29e
--- /dev/null
+++ b/arch/arm/plat-s5p/include/plat/pll.h
@@ -0,0 +1,83 @@
+/* arch/arm/plat-s5p/include/plat/pll.h
+ *
+ * Copyright (c) 2009 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * S5P PLL code
+ *
+ * Based on arch/arm/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 PLL45XX_MDIV_MASK (0x3FF)
+#define PLL45XX_PDIV_MASK (0x3F)
+#define PLL45XX_SDIV_MASK (0x7)
+#define PLL45XX_MDIV_SHIFT (16)
+#define PLL45XX_PDIV_SHIFT (8)
+#define PLL45XX_SDIV_SHIFT (0)
+
+#include <asm/div64.h>
+
+enum pll45xx_type_t {
+ pll_4500,
+ pll_4502,
+ pll_4508
+};
+
+static inline unsigned long s5p_get_pll45xx(unsigned long baseclk, u32 pll_con,
+ enum pll45xx_type_t pll_type)
+{
+ u32 mdiv, pdiv, sdiv;
+ u64 fvco = baseclk;
+
+ mdiv = (pll_con >> PLL45XX_MDIV_SHIFT) & PLL45XX_MDIV_MASK;
+ pdiv = (pll_con >> PLL45XX_PDIV_SHIFT) & PLL45XX_PDIV_MASK;
+ sdiv = (pll_con >> PLL45XX_SDIV_SHIFT) & PLL45XX_SDIV_MASK;
+
+ if (pll_type == pll_4508)
+ sdiv = sdiv - 1;
+
+ fvco *= mdiv;
+ do_div(fvco, (pdiv << sdiv));
+
+ return (unsigned long)fvco;
+}
+
+#define PLL90XX_MDIV_MASK (0xFF)
+#define PLL90XX_PDIV_MASK (0x3F)
+#define PLL90XX_SDIV_MASK (0x7)
+#define PLL90XX_KDIV_MASK (0xffff)
+#define PLL90XX_MDIV_SHIFT (16)
+#define PLL90XX_PDIV_SHIFT (8)
+#define PLL90XX_SDIV_SHIFT (0)
+#define PLL90XX_KDIV_SHIFT (0)
+
+static inline unsigned long s5p_get_pll90xx(unsigned long baseclk,
+ u32 pll_con, u32 pll_conk)
+{
+ unsigned long result;
+ u32 mdiv, pdiv, sdiv, kdiv;
+ u64 tmp;
+
+ mdiv = (pll_con >> PLL90XX_MDIV_SHIFT) & PLL90XX_MDIV_MASK;
+ pdiv = (pll_con >> PLL90XX_PDIV_SHIFT) & PLL90XX_PDIV_MASK;
+ sdiv = (pll_con >> PLL90XX_SDIV_SHIFT) & PLL90XX_SDIV_MASK;
+ kdiv = pll_conk & PLL90XX_KDIV_MASK;
+
+ /* We need to multiple baseclk by mdiv (the integer part) and kdiv
+ * which is in 2^16ths, so shift mdiv up (does not overflow) and
+ * add kdiv before multiplying. The use of tmp is to avoid any
+ * overflows before shifting bac down into result when multipling
+ * by the mdiv and kdiv pair.
+ */
+
+ tmp = baseclk;
+ tmp *= (mdiv << 16) + kdiv;
+ do_div(tmp, (pdiv << sdiv));
+ result = tmp >> 16;
+
+ return result;
+}