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/*
* Copyright 2008 Extreme Engineering Solutions, Inc.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
/*
* Return SYSCLK input frequency - 50 MHz or 66 MHz depending on POR config
*/
unsigned long get_board_sys_clk(ulong dummy)
{
#if defined(CONFIG_MPC85xx)
volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
#elif defined(CONFIG_MPC86xx)
immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
volatile ccsr_gur_t *gur = &immap->im_gur;
#endif
u32 gpporcr = gur->gpporcr;
if (gpporcr & 0x10000)
return 66666666;
else
return 50000000;
}
#ifdef CONFIG_MPC85xx
/*
* Return DDR input clock - synchronous with SYSCLK or 66 MHz
* Note: 86xx doesn't support asynchronous DDR clk
*/
unsigned long get_board_ddr_clk(ulong dummy)
{
volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
u32 ddr_ratio = ((gur->porpllsr) & 0x00003e00) >> 9;
if (ddr_ratio == 0x7)
return get_board_sys_clk(dummy);
return 66666666;
}
#endif
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