LXR uboot/arch/m68k/cpu/mcf523x/speed.c

   1/*
   2 *
   3 * (C) Copyright 2000-2003
   4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5 *
   6 * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
   7 * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
   8 *
   9 * See file CREDITS for list of people who contributed to this
  10 * project.
  11 *
  12 * This program is free software; you can redistribute it and/or
  13 * modify it under the terms of the GNU General Public License as
  14 * published by the Free Software Foundation; either version 2 of
  15 * the License, or (at your option) any later version.
  16 *
  17 * This program is distributed in the hope that it will be useful,
  18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 * GNU General Public License for more details.
  21 *
  22 * You should have received a copy of the GNU General Public License
  23 * along with this program; if not, write to the Free Software
  24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  25 * MA 02111-1307 USA
  26 */
  27
  28#include <common.h>
  29#include <asm/processor.h>
  30
  31#include <asm/immap.h>
  32
  33DECLARE_GLOBAL_DATA_PTR;
  34/*
  35 * get_clocks() fills in gd->cpu_clock and gd->bus_clk
  36 */
  37int get_clocks(void)
  38{
  39        volatile pll_t *pll = (volatile pll_t *)(MMAP_PLL);
  40
  41        pll->syncr = PLL_SYNCR_MFD(1);
  42
  43        while (!(pll->synsr & PLL_SYNSR_LOCK));
  44
  45        gd->bus_clk = CONFIG_SYS_CLK;
  46        gd->cpu_clk = (gd->bus_clk * 2);
  47
  48#ifdef CONFIG_FSL_I2C
  49        gd->i2c1_clk = gd->bus_clk;
  50#endif
  51
  52        return (0);
  53}
  54