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/*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* 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
*/
/*
* Yoo. Jonghoon, IPone, yooth@ipone.co.kr
* U-Boot port on RPXlite board
*
* DRAM related UPMA register values are modified.
* See RPXLite engineering note : 50MHz/60ns - UPM RAM WORDS
*/
#include <common.h>
#include <mpc8xx.h>
/* ------------------------------------------------------------------------- */
static long int dram_size (long int, long int *, long int);
/* ------------------------------------------------------------------------- */
#define _NOT_USED_ 0xFFFFCC25
const uint sdram_table[] = {
/*
* Single Read. (Offset 00h in UPMA RAM)
*/
0xCFFFCC24, 0x0FFFCC04, 0X0CAFCC04, 0X03AFCC08,
0x3FBFCC27, /* last */
_NOT_USED_, _NOT_USED_, _NOT_USED_,
/*
* Burst Read. (Offset 08h in UPMA RAM)
*/
0xCFFFCC24, 0x0FFFCC04, 0x0CAFCC84, 0x03AFCC88,
0x3FBFCC27, /* last */
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_, _NOT_USED_,
/*
* Single Write. (Offset 18h in UPMA RAM)
*/
0xCFFFCC24, 0x0FFFCC04, 0x0CFFCC04, 0x03FFCC00,
0x3FFFCC27, /* last */
_NOT_USED_, _NOT_USED_, _NOT_USED_,
/*
* Burst Write. (Offset 20h in UPMA RAM)
*/
0xCFFFCC24, 0x0FFFCC04, 0x0CFFCC80, 0x03FFCC8C,
0x0CFFCC00, 0x33FFCC27, /* last */
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_,
/*
* Refresh. (Offset 30h in UPMA RAM)
*/
0xC0FFCC24, 0x03FFCC24, 0x0FFFCC24, 0x0FFFCC24,
0x3FFFCC27, /* last */
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_, _NOT_USED_,
/*
* Exception. (Offset 3Ch in UPMA RAM)
*/
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_
};
/* ------------------------------------------------------------------------- */
/*
* Check Board Identity:
*/
int checkboard (void)
{
puts ("Board: RPXlite\n");
return (0);
}
/* ------------------------------------------------------------------------- */
long int initdram (int board_type)
{
volatile immap_t *immap = (immap_t *) CFG_IMMR;
volatile memctl8xx_t *memctl = &immap->im_memctl;
long int size10;
upmconfig (UPMA, (uint *) sdram_table,
sizeof (sdram_table) / sizeof (uint));
/* Refresh clock prescalar */
memctl->memc_mptpr = CFG_MPTPR;
memctl->memc_mar = 0x00000000;
/* Map controller banks 1 to the SDRAM bank */
memctl->memc_or1 = CFG_OR1_PRELIM;
memctl->memc_br1 = CFG_BR1_PRELIM;
memctl->memc_mamr = CFG_MAMR_10COL & (~(MAMR_PTAE)); /* no refresh yet */
udelay (200);
/* perform SDRAM initializsation sequence */
memctl->memc_mcr = 0x80002230; /* SDRAM bank 0 - refresh twice */
udelay (1);
memctl->memc_mamr |= MAMR_PTAE; /* enable refresh */
udelay (1000);
/* Check Bank 0 Memory Size
* try 10 column mode
*/
size10 = dram_size (CFG_MAMR_10COL, SDRAM_BASE_PRELIM,
SDRAM_MAX_SIZE);
return (size10);
}
/* ------------------------------------------------------------------------- */
/*
* Check memory range for valid RAM. A simple memory test determines
* the actually available RAM size between addresses `base' and
* `base + maxsize'. Some (not all) hardware errors are detected:
* - short between address lines
* - short between data lines
*/
static long int dram_size (long int mamr_value, long int *base,
long int maxsize)
{
volatile immap_t *immap = (immap_t *) CFG_IMMR;
volatile memctl8xx_t *memctl = &immap->im_memctl;
memctl->memc_mamr = mamr_value;
return (get_ram_size (base, maxsize));
}
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