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/*
* Memory Setup stuff - taken from blob memsetup.S
*
* Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) and
* Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
*
* Modified for the TRAB board by
* (C) Copyright 2002-2003
* Gary Jennejohn, DENX Software Engineering, <garyj@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 <config.h>
#include <version.h>
/* some parameters for the board */
/*
*
* Copied from linux/arch/arm/boot/compressed/head-s3c2400.S
*
* Copyright (C) 2001 Samsung Electronics by chc, 010406
*
* TRAB specific tweaks.
*
*/
/* memory controller */
#define BWSCON 0x14000000
/* Bank0 */
#define B0_Tacs 0x1 /* 1 clk */
#define B0_Tcos 0x1 /* 1 clk */
#define B0_Tacc 0x5 /* 8 clk */
#define B0_Tcoh 0x1 /* 1 clk */
#define B0_Tah 0x1 /* 1 clk */
#define B0_Tacp 0x0
#define B0_PMC 0x0 /* normal */
/* Bank1 - SRAM */
#define B1_Tacs 0x1 /* 1 clk */
#define B1_Tcos 0x1 /* 1 clk */
#define B1_Tacc 0x5 /* 8 clk */
#define B1_Tcoh 0x1 /* 1 clk */
#define B1_Tah 0x1 /* 1 clk */
#define B1_Tacp 0x0
#define B1_PMC 0x0 /* normal */
/* Bank2 - CPLD */
#define B2_Tacs 0x1 /* 1 clk */
#define B2_Tcos 0x1 /* 1 clk */
#define B2_Tacc 0x5 /* 8 clk */
#define B2_Tcoh 0x1 /* 1 clk */
#define B2_Tah 0x1 /* 1 clk */
#define B2_Tacp 0x0
#define B2_PMC 0x0 /* normal */
/* Bank3 - setup for the cs8900 */
#define B3_Tacs 0x3 /* 4 clk */
#define B3_Tcos 0x3 /* 4 clk */
#define B3_Tacc 0x7 /* 14 clk */
#define B3_Tcoh 0x1 /* 1 clk */
#define B3_Tah 0x0 /* 0 clk */
#define B3_Tacp 0x3 /* 6 clk */
#define B3_PMC 0x0 /* normal */
/* Bank4 */
#define B4_Tacs 0x0 /* 0 clk */
#define B4_Tcos 0x0 /* 0 clk */
#define B4_Tacc 0x7 /* 14 clk */
#define B4_Tcoh 0x0 /* 0 clk */
#define B4_Tah 0x0 /* 0 clk */
#define B4_Tacp 0x0
#define B4_PMC 0x0 /* normal */
/* Bank5 */
#define B5_Tacs 0x0 /* 0 clk */
#define B5_Tcos 0x0 /* 0 clk */
#define B5_Tacc 0x7 /* 14 clk */
#define B5_Tcoh 0x0 /* 0 clk */
#define B5_Tah 0x0 /* 0 clk */
#define B5_Tacp 0x0
#define B5_PMC 0x0 /* normal */
#ifndef CONFIG_RAM_16MB /* 32 MB RAM */
/* Bank6 */
#define B6_MT 0x3 /* SDRAM */
#define B6_Trcd 0x0 /* 2clk */
#define B6_SCAN 0x1 /* 9 bit */
/* Bank7 */
#define B7_MT 0x3 /* SDRAM */
#define B7_Trcd 0x0 /* 2clk */
#define B7_SCAN 0x1 /* 9 bit */
#else /* CONFIG_RAM_16MB = 16 MB RAM */
/* Bank6 */
#define B6_MT 0x3 /* SDRAM */
#define B6_Trcd 0x1 /* 2clk */
#define B6_SCAN 0x0 /* 8 bit */
/* Bank7 */
#define B7_MT 0x3 /* SDRAM */
#define B7_Trcd 0x1 /* 2clk */
#define B7_SCAN 0x0 /* 8 bit */
#endif /* CONFIG_RAM_16MB */
/* refresh parameter */
#define REFEN 0x1 /* enable refresh */
#define TREFMD 0x0 /* CBR(CAS before RAS)/auto refresh */
#define Trp 0x0 /* 2 clk */
#define Trc 0x3 /* 7 clk */
#define Tchr 0x2 /* 3 clk */
#ifdef CONFIG_TRAB_50MHZ
#define REFCNT 1269 /* period=15.6 us, HCLK=50Mhz, (2048+1-15.6*50) */
#else
#define REFCNT 1011 /* period=15.6 us, HCLK=66.5Mhz, (2048+1-15.6*66.5) */
#endif
_TEXT_BASE:
.word TEXT_BASE
.globl lowlevel_init
lowlevel_init:
/* memory control configuration */
/* make r0 relative the current location so that it */
/* reads SMRDATA out of FLASH rather than memory ! */
ldr r0, =SMRDATA
ldr r1, _TEXT_BASE
sub r0, r0, r1
ldr r1, =BWSCON /* Bus Width Status Controller */
add r2, r0, #52
0:
ldr r3, [r0], #4
str r3, [r1], #4
cmp r2, r0
bne 0b
/* everything is fine now */
mov pc, lr
.ltorg
/* the literal pools origin */
SMRDATA:
.word 0x2211d644 /* d->Ethernet, 6->CPLD, 4->SRAM, 4->FLASH */
.word ((B0_Tacs<<13)+(B0_Tcos<<11)+(B0_Tacc<<8)+(B0_Tcoh<<6)+(B0_Tah<<4)+(B0_Tacp<<2)+(B0_PMC)) /* GCS0 */
.word ((B1_Tacs<<13)+(B1_Tcos<<11)+(B1_Tacc<<8)+(B1_Tcoh<<6)+(B1_Tah<<4)+(B1_Tacp<<2)+(B1_PMC)) /* GCS1 */
.word ((B2_Tacs<<13)+(B2_Tcos<<11)+(B2_Tacc<<8)+(B2_Tcoh<<6)+(B2_Tah<<4)+(B2_Tacp<<2)+(B2_PMC)) /* GCS2 */
.word ((B3_Tacs<<13)+(B3_Tcos<<11)+(B3_Tacc<<8)+(B3_Tcoh<<6)+(B3_Tah<<4)+(B3_Tacp<<2)+(B3_PMC)) /* GCS3 */
.word ((B4_Tacs<<13)+(B4_Tcos<<11)+(B4_Tacc<<8)+(B4_Tcoh<<6)+(B4_Tah<<4)+(B4_Tacp<<2)+(B4_PMC)) /* GCS4 */
.word ((B5_Tacs<<13)+(B5_Tcos<<11)+(B5_Tacc<<8)+(B5_Tcoh<<6)+(B5_Tah<<4)+(B5_Tacp<<2)+(B5_PMC)) /* GCS5 */
.word ((B6_MT<<15)+(B6_Trcd<<2)+(B6_SCAN)) /* GCS6 */
.word ((B7_MT<<15)+(B7_Trcd<<2)+(B7_SCAN)) /* GCS7 */
.word ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+(Tchr<<16)+REFCNT)
#ifndef CONFIG_RAM_16MB /* 32 MB RAM */
.word 0x10 /* BUSWIDTH=32, SCLK power saving mode, BANKSIZE 32M/32M */
#else /* CONFIG_RAM_16MB = 16 MB RAM */
.word 0x17 /* BUSWIDTH=32, SCLK power saving mode, BANKSIZE 16M/16M */
#endif /* CONFIG_RAM_16MB */
.word 0x20 /* MRSR6, CL=2clk */
.word 0x20 /* MRSR7 */
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