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pll.h

/* arch/arm/plat-s3c64xx/include/plat/pll.h
 *
 * Copyright 2008 Openmoko, Inc.
 * Copyright 2008 Simtec Electronics
 *    Ben Dooks <ben@simtec.co.uk>
 *    http://armlinux.simtec.co.uk/
 *
 * S3C64XX PLL code
 *
 * 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 S3C6400_PLL_MDIV_MASK ((1 << (25-16+1)) - 1)
#define S3C6400_PLL_PDIV_MASK ((1 << (13-8+1)) - 1)
#define S3C6400_PLL_SDIV_MASK ((1 << (2-0+1)) - 1)
#define S3C6400_PLL_MDIV_SHIFT      (16)
#define S3C6400_PLL_PDIV_SHIFT      (8)
#define S3C6400_PLL_SDIV_SHIFT      (0)

#include <asm/div64.h>

static inline unsigned long s3c6400_get_pll(unsigned long baseclk,
                                  u32 pllcon)
{
      u32 mdiv, pdiv, sdiv;
      u64 fvco = baseclk;

      mdiv = (pllcon >> S3C6400_PLL_MDIV_SHIFT) & S3C6400_PLL_MDIV_MASK;
      pdiv = (pllcon >> S3C6400_PLL_PDIV_SHIFT) & S3C6400_PLL_PDIV_MASK;
      sdiv = (pllcon >> S3C6400_PLL_SDIV_SHIFT) & S3C6400_PLL_SDIV_MASK;

      fvco *= mdiv;
      do_div(fvco, (pdiv << sdiv));

      return (unsigned long)fvco;
}

#define S3C6400_EPLL_MDIV_MASK      ((1 << (23-16)) - 1)
#define S3C6400_EPLL_PDIV_MASK      ((1 << (13-8)) - 1)
#define S3C6400_EPLL_SDIV_MASK      ((1 << (2-0)) - 1)
#define S3C6400_EPLL_MDIV_SHIFT     (16)
#define S3C6400_EPLL_PDIV_SHIFT     (8)
#define S3C6400_EPLL_SDIV_SHIFT     (0)
#define S3C6400_EPLL_KDIV_MASK  (0xffff)

static inline unsigned long s3c6400_get_epll(unsigned long baseclk)
{
      unsigned long result;
      u32 epll0 = __raw_readl(S3C_EPLL_CON0);
      u32 epll1 = __raw_readl(S3C_EPLL_CON1);
      u32 mdiv, pdiv, sdiv, kdiv;
      u64 tmp;

      mdiv = (epll0 >> S3C6400_EPLL_MDIV_SHIFT) & S3C6400_EPLL_MDIV_MASK;
      pdiv = (epll0 >> S3C6400_EPLL_PDIV_SHIFT) & S3C6400_EPLL_PDIV_MASK;
      sdiv = (epll0 >> S3C6400_EPLL_SDIV_SHIFT) & S3C6400_EPLL_SDIV_MASK;
      kdiv = epll1 & S3C6400_EPLL_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;
}

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