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
  33 DECLARE_GLOBAL_DATA_PTR;
  34 /*
  35  * get_clocks() fills in gd->cpu_clock and gd->bus_clk
  36  */
  37 int 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 }