mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-24 20:13:39 +00:00
124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
/*
|
|
* (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/m5271.h>
|
|
#include <asm/immap_5271.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);
|
|
}
|