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

   1 /* arch/arm/plat-s5pc1xx/include/plat/pll.h
   2  *
   3  * Copyright 2009 Samsung Electronics Co.
   4  *      Byungho Min <bhmin@samsung.com>
   5  *
   6  * S5PC1XX PLL code
   7  *
   8  * Based on plat-s3c64xx/include/plat/pll.h
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13 */
  14
  15 #define S5P_PLL_MDIV_MASK       ((1 << (25-16+1)) - 1)
  16 #define S5P_PLL_PDIV_MASK       ((1 << (13-8+1)) - 1)
  17 #define S5P_PLL_SDIV_MASK       ((1 << (2-0+1)) - 1)
  18 #define S5P_PLL_MDIV_SHIFT      (16)
  19 #define S5P_PLL_PDIV_SHIFT      (8)
  20 #define S5P_PLL_SDIV_SHIFT      (0)
  21
  22 #include <asm/div64.h>
  23
  24 static inline unsigned long s5pc1xx_get_pll(unsigned long baseclk,
  25                                             u32 pllcon)
  26 {
  27         u32 mdiv, pdiv, sdiv;
  28         u64 fvco = baseclk;
  29
  30         mdiv = (pllcon >> S5P_PLL_MDIV_SHIFT) & S5P_PLL_MDIV_MASK;
  31         pdiv = (pllcon >> S5P_PLL_PDIV_SHIFT) & S5P_PLL_PDIV_MASK;
  32         sdiv = (pllcon >> S5P_PLL_SDIV_SHIFT) & S5P_PLL_SDIV_MASK;
  33
  34         fvco *= mdiv;
  35         do_div(fvco, (pdiv << sdiv));
  36
  37         return (unsigned long)fvco;
  38 }