board/xes/common/fsl_8xxx_clk.c

   1 /*
   2  * Copyright 2008 Extreme Engineering Solutions, Inc.
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22
  23 #include <common.h>
  24 #include <asm/io.h>
  25
  26 /*
  27  * Return SYSCLK input frequency - 50 MHz or 66 MHz depending on POR config
  28  */
  29 unsigned long get_board_sys_clk(ulong dummy)
  30 {
  31 #if defined(CONFIG_MPC85xx)
  32         volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
  33 #elif defined(CONFIG_MPC86xx)
  34         immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
  35         volatile ccsr_gur_t *gur = &immap->im_gur;
  36 #endif
  37
  38         if (in_be32(&gur->gpporcr) & 0x10000)
  39                 return 66666666;
  40         else
  41                 return 50000000;
  42 }
  43
  44 #ifdef CONFIG_MPC85xx
  45 /*
  46  * Return DDR input clock - synchronous with SYSCLK or 66 MHz
  47  * Note: 86xx doesn't support asynchronous DDR clk
  48  */
  49 unsigned long get_board_ddr_clk(ulong dummy)
  50 {
  51         volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
  52         u32 ddr_ratio = (in_be32(&gur->porpllsr) & 0x00003e00) >> 9;
  53
  54         if (ddr_ratio == 0x7)
  55                 return get_board_sys_clk(dummy);
  56
  57         return 66666666;
  58 }
  59 #endif