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pll.h

/* 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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