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/*
* (C) Copyright 2000-2006
* 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
*/
#include <common.h>
#include <asm/immap.h>
int checkboard (void) {
puts ("Board: Freescale M5271EVB\n");
return 0;
};
long int initdram (int board_type) {
int i;
/* Enable Address lines 23-21 and lower 16bits of data path */
mbar_writeByte(MCF_GPIO_PAR_AD, MCF_GPIO_AD_ADDR23 |
MCF_GPIO_AD_ADDR22 | MCF_GPIO_AD_ADDR21 |
MCF_GPIO_AD_DATAL);
/* Set CS2 pin to be SD_CS0 */
mbar_writeByte(MCF_GPIO_PAR_CS, mbar_readByte(MCF_GPIO_PAR_CS)
| MCF_GPIO_PAR_CS_PAR_CS2);
/* Configure SDRAM Control Pin Assignemnt Register */
mbar_writeByte(MCF_GPIO_PAR_SDRAM, MCF_GPIO_SDRAM_CSSDCS_00 |
MCF_GPIO_SDRAM_SDWE | MCF_GPIO_SDRAM_SCAS |
MCF_GPIO_SDRAM_SRAS | MCF_GPIO_SDRAM_SCKE |
MCF_GPIO_SDRAM_SDCS_11);
/*
* Check to see if the SDRAM has already been initialized
* by a run control tool
*/
if (!(mbar_readLong(MCF_SDRAMC_DACR0) & MCF_SDRAMC_DACRn_RE)) {
/* Initialize DRAM Control Register: DCR */
mbar_writeShort(MCF_SDRAMC_DCR,
MCF_SDRAMC_DCR_RTIM(0x01)
| MCF_SDRAMC_DCR_RC(0x30));
/*
* Initialize DACR0
*
* CASL: 01
* CBM: cmd at A20, bank select bits 21 and up
* PS: 32bit port size
*/
mbar_writeLong(MCF_SDRAMC_DACR0,
MCF_SDRAMC_DACRn_BA(CFG_SDRAM_BASE>>18)
| MCF_SDRAMC_DACRn_CASL(1)
| MCF_SDRAMC_DACRn_CBM(3)
| MCF_SDRAMC_DACRn_PS(0));
/* Initialize DMR0 */
mbar_writeLong(MCF_SDRAMC_DMR0,
MCF_SDRAMC_DMRn_BAM_16M
| MCF_SDRAMC_DMRn_V);
/* Set IP bit in DACR */
mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0)
| MCF_SDRAMC_DACRn_IP);
/* Wait at least 20ns to allow banks to precharge */
for (i = 0; i < 5; i++)
asm(" nop");
/* Write to this block to initiate precharge */
*(u32 *)(CFG_SDRAM_BASE) = 0xa5a5a5a5;
/* Set RE bit in DACR */
mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0)
| MCF_SDRAMC_DACRn_RE);
/* Wait for at least 8 auto refresh cycles to occur */
for (i = 0; i < 2000; i++)
asm(" nop");
/* Finish the configuration by issuing the MRS */
mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0)
| MCF_SDRAMC_DACRn_MRS);
/*
* Write to the SDRAM Mode Register A0-A11 = 0x400
*
* Write Burst Mode = Programmed Burst Length
* Op Mode = Standard Op
* CAS Latency = 2
* Burst Type = Sequential
* Burst Length = 1
*/
*(u32 *)(CFG_SDRAM_BASE + 0x400) = 0xa5a5a5a5;
}
return CFG_SDRAM_SIZE * 1024 * 1024;
};
int testdram (void) {
/* TODO: XXX XXX XXX */
printf ("DRAM test not implemented!\n");
return (0);
}
|
