release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-s3c64xx/include/mach/pll.h

   1 /* arch/arm/plat-s3c64xx/include/plat/pll.h
   2  *
   3  * Copyright 2008 Openmoko, Inc.
   4  * Copyright 2008 Simtec Electronics
   5  *      Ben Dooks <ben@simtec.co.uk>
   6  *      http://armlinux.simtec.co.uk/
   7  *
   8  * S3C64XX PLL code
   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 S3C6400_PLL_MDIV_MASK   ((1 << (25-16+1)) - 1)
  16 #define S3C6400_PLL_PDIV_MASK   ((1 << (13-8+1)) - 1)
  17 #define S3C6400_PLL_SDIV_MASK   ((1 << (2-0+1)) - 1)
  18 #define S3C6400_PLL_MDIV_SHIFT  (16)
  19 #define S3C6400_PLL_PDIV_SHIFT  (8)
  20 #define S3C6400_PLL_SDIV_SHIFT  (0)
  21
  22 #include <asm/div64.h>
  23 #include <plat/pll6553x.h>
  24
  25 static inline unsigned long s3c6400_get_pll(unsigned long baseclk,
  26                                             u32 pllcon)
  27 {
  28         u32 mdiv, pdiv, sdiv;
  29         u64 fvco = baseclk;
  30
  31         mdiv = (pllcon >> S3C6400_PLL_MDIV_SHIFT) & S3C6400_PLL_MDIV_MASK;
  32         pdiv = (pllcon >> S3C6400_PLL_PDIV_SHIFT) & S3C6400_PLL_PDIV_MASK;
  33         sdiv = (pllcon >> S3C6400_PLL_SDIV_SHIFT) & S3C6400_PLL_SDIV_MASK;
  34
  35         fvco *= mdiv;
  36         do_div(fvco, (pdiv << sdiv));
  37
  38         return (unsigned long)fvco;
  39 }
  40
  41 static inline unsigned long s3c6400_get_epll(unsigned long baseclk)
  42 {
  43         return s3c_get_pll6553x(baseclk, __raw_readl(S3C_EPLL_CON0),
  44                                 __raw_readl(S3C_EPLL_CON1));
  45 }