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Diffstat (limited to 'board/sbc2410x/lowlevel_init.S')
| -rw-r--r-- | board/sbc2410x/lowlevel_init.S | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/board/sbc2410x/lowlevel_init.S b/board/sbc2410x/lowlevel_init.S new file mode 100644 index 0000000..3df63cd --- /dev/null +++ b/board/sbc2410x/lowlevel_init.S @@ -0,0 +1,163 @@ +/* + * 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 Samsung SMDK2410 by + * (C) Copyright 2002 + * David Mueller, ELSOFT AG, <d.mueller@elsoft.ch> + * + * Modified for the friendly-arm SBC-2410X by + * (C) Copyright 2005 + * JinHua Luo, GuangDong Linux Center, <luo.jinhua@gd-linux.com> + * + * 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> + +/* + * Taken from linux/arch/arm/boot/compressed/head-s3c2410.S + * + * Copyright (C) 2002 Samsung Electronics SW.LEE <hitchcar@sec.samsung.com> + */ + +#define BWSCON 0x48000000 + +/* BWSCON */ +#define DW8 (0x0) +#define DW16 (0x1) +#define DW32 (0x2) +#define WAIT (0x1<<2) +#define UBLB (0x1<<3) + +#define B1_BWSCON (DW16) +#define B2_BWSCON (DW16) +#define B3_BWSCON (DW16 + WAIT + UBLB) +#define B4_BWSCON (DW16) +#define B5_BWSCON (DW16) +#define B6_BWSCON (DW32) +#define B7_BWSCON (DW32) + +#define B0_Tacs 0x0 +#define B0_Tcos 0x0 +#define B0_Tacc 0x7 +#define B0_Tcoh 0x0 +#define B0_Tah 0x0 +#define B0_Tacp 0x0 +#define B0_PMC 0x0 + +#define B1_Tacs 0x0 +#define B1_Tcos 0x0 +#define B1_Tacc 0x7 +#define B1_Tcoh 0x0 +#define B1_Tah 0x0 +#define B1_Tacp 0x0 +#define B1_PMC 0x0 + +#define B2_Tacs 0x0 +#define B2_Tcos 0x0 +#define B2_Tacc 0x7 +#define B2_Tcoh 0x0 +#define B2_Tah 0x0 +#define B2_Tacp 0x0 +#define B2_PMC 0x0 + +#define B3_Tacs 0xc +#define B3_Tcos 0x7 +#define B3_Tacc 0xf +#define B3_Tcoh 0x1 +#define B3_Tah 0x0 +#define B3_Tacp 0x0 +#define B3_PMC 0x0 + +#define B4_Tacs 0x0 +#define B4_Tcos 0x0 +#define B4_Tacc 0x7 +#define B4_Tcoh 0x0 +#define B4_Tah 0x0 +#define B4_Tacp 0x0 +#define B4_PMC 0x0 + +#define B5_Tacs 0xc +#define B5_Tcos 0x7 +#define B5_Tacc 0xf +#define B5_Tcoh 0x1 +#define B5_Tah 0x0 +#define B5_Tacp 0x0 +#define B5_PMC 0x0 + +#define B6_MT 0x3 /* SDRAM */ +#define B6_Trcd 0x1 +#define B6_SCAN 0x1 /* 9bit */ + +#define B7_MT 0x3 /* SDRAM */ +#define B7_Trcd 0x1 /* 3clk */ +#define B7_SCAN 0x1 /* 9bit */ + +/* REFRESH parameter */ +#define REFEN 0x1 /* Refresh enable */ +#define TREFMD 0x0 /* CBR(CAS before RAS)/Auto refresh */ +#define Trp 0x0 /* 2clk */ +#define Trc 0x3 /* 7clk */ +#define Tchr 0x2 /* 3clk */ +#define REFCNT 0x0459 +/**************************************/ + +_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, #13*4 +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 (0+(B1_BWSCON<<4)+(B2_BWSCON<<8)+(B3_BWSCON<<12)+(B4_BWSCON<<16)+(B5_BWSCON<<20)+(B6_BWSCON<<24)+(B7_BWSCON<<28)) + .word ((B0_Tacs<<13)+(B0_Tcos<<11)+(B0_Tacc<<8)+(B0_Tcoh<<6)+(B0_Tah<<4)+(B0_Tacp<<2)+(B0_PMC)) + .word ((B1_Tacs<<13)+(B1_Tcos<<11)+(B1_Tacc<<8)+(B1_Tcoh<<6)+(B1_Tah<<4)+(B1_Tacp<<2)+(B1_PMC)) + .word ((B2_Tacs<<13)+(B2_Tcos<<11)+(B2_Tacc<<8)+(B2_Tcoh<<6)+(B2_Tah<<4)+(B2_Tacp<<2)+(B2_PMC)) + .word ((B3_Tacs<<13)+(B3_Tcos<<11)+(B3_Tacc<<8)+(B3_Tcoh<<6)+(B3_Tah<<4)+(B3_Tacp<<2)+(B3_PMC)) + .word ((B4_Tacs<<13)+(B4_Tcos<<11)+(B4_Tacc<<8)+(B4_Tcoh<<6)+(B4_Tah<<4)+(B4_Tacp<<2)+(B4_PMC)) + .word ((B5_Tacs<<13)+(B5_Tcos<<11)+(B5_Tacc<<8)+(B5_Tcoh<<6)+(B5_Tah<<4)+(B5_Tacp<<2)+(B5_PMC)) + .word ((B6_MT<<15)+(B6_Trcd<<2)+(B6_SCAN)) + .word ((B7_MT<<15)+(B7_Trcd<<2)+(B7_SCAN)) + .word ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+(Tchr<<16)+REFCNT) + .word 0xb2 + .word 0x30 + .word 0x30 |