summaryrefslogtreecommitdiff
path: root/board/smdk2400/lowlevel_init.S
diff options
context:
space:
mode:
Diffstat (limited to 'board/smdk2400/lowlevel_init.S')
-rw-r--r--board/smdk2400/lowlevel_init.S163
1 files changed, 163 insertions, 0 deletions
diff --git a/board/smdk2400/lowlevel_init.S b/board/smdk2400/lowlevel_init.S
new file mode 100644
index 0000000..a5de806
--- /dev/null
+++ b/board/smdk2400/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 development board by
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <gj@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 */
+
+/*
+ *
+ * Taken from linux/arch/arm/boot/compressed/head-s3c2400.S
+ *
+ * Copyright (C) 2001 Samsung Electronics by chc, 010406
+ *
+ * S3C2400 specific tweaks.
+ *
+ */
+
+/* memory controller */
+#define BWSCON 0x14000000
+#define BANKCON3 0x14000010 /* for cs8900, ethernet */
+
+/* Bank0 */
+#define B0_Tacs 0x0 /* 0 clk */
+#define B0_Tcos 0x0 /* 0 clk */
+#define B0_Tacc 0x7 /* 14 clk */
+#define B0_Tcoh 0x0 /* 0 clk */
+#define B0_Tah 0x0 /* 0 clk */
+#define B0_Tacp 0x0
+#define B0_PMC 0x0 /* normal */
+
+/* Bank1 */
+#define B1_Tacs 0x0 /* 0 clk */
+#define B1_Tcos 0x0 /* 0 clk */
+#define B1_Tacc 0x7 /* 14 clk */
+#define B1_Tcoh 0x0 /* 0 clk */
+#define B1_Tah 0x0 /* 0 clk */
+#define B1_Tacp 0x0
+#define B1_PMC 0x0 /* normal */
+
+/* Bank2 */
+#define B2_Tacs 0x0 /* 0 clk */
+#define B2_Tcos 0x0 /* 0 clk */
+#define B2_Tacc 0x7 /* 14 clk */
+#define B2_Tcoh 0x0 /* 0 clk */
+#define B2_Tah 0x0 /* 0 clk */
+#define B2_Tacp 0x0
+#define B2_PMC 0x0 /* normal */
+
+/* Bank3 - setup for the cs8900 */
+#define B3_Tacs 0x0 /* 0 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 */
+
+/* Bank6 */
+#define B6_MT 0x3 /* SDRAM */
+#define B6_Trcd 0x1 /* 3clk */
+#define B6_SCAN 0x1 /* 9 bit */
+
+/* Bank7 */
+#define B7_MT 0x3 /* SDRAM */
+#define B7_Trcd 0x1 /* 3clk */
+#define B7_SCAN 0x1 /* 9 bit */
+
+/* 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 */
+
+#define REFCNT 1113 /* period=15.6 us, HCLK=60Mhz, (2048+1-15.6*66) */
+
+
+_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 0x2211d114 /* d->Ethernet, BUSWIDTH=32 */
+ .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)
+ .word 0x10 /* BUSWIDTH=32, SCLK power saving mode, BANKSIZE 32M/32M */
+ .word 0x30 /* MRSR6, CL=3clk */
+ .word 0x30 /* MRSR7 */