LXR linux/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
  25static 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
  41static 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}
  46