summaryrefslogtreecommitdiff
path: root/board/siemens/SMN42/lowlevel_init.S
diff options
context:
space:
mode:
Diffstat (limited to 'board/siemens/SMN42/lowlevel_init.S')
-rw-r--r--board/siemens/SMN42/lowlevel_init.S123
1 files changed, 123 insertions, 0 deletions
diff --git a/board/siemens/SMN42/lowlevel_init.S b/board/siemens/SMN42/lowlevel_init.S
new file mode 100644
index 00000000000..11abb633245
--- /dev/null
+++ b/board/siemens/SMN42/lowlevel_init.S
@@ -0,0 +1,123 @@
+/*
+ * (C) Copyright 2006 Embedded Artists AB <www.embeddedartists.com>
+ *
+ * Slight modifications made to support the SMN42 board from Siemens.
+ * 2007 Gary Jennejohn garyj@denx.de
+ *
+ * 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>
+#include <asm/arch/hardware.h>
+
+/* some parameters for the board */
+/* setting up the CPU-internal memory */
+#define SRAM_START 0x40000000
+#define SRAM_SIZE 0x00004000
+#define BCFG0_VALUE 0x1000ffef
+#define BCFG1_VALUE 0x10005D2F
+#define BCFG2_VALUE 0x10005D2F
+/*
+ * For P0.18 to set ZZ to the SRAMs to 1. Also set P0.2 (SCL) and P0.3 (SDA)
+ * for the bit-banger I2C driver correctly.
+ */
+#define IO0_VALUE 0x4000C
+
+_TEXT_BASE:
+ .word TEXT_BASE
+MEMMAP_ADR:
+ .word MEMMAP
+BCFG0_ADR:
+ .word BCFG0
+_BCFG0_VALUE:
+ .word BCFG0_VALUE
+BCFG1_ADR:
+ .word BCFG1
+_BCFG1_VALUE:
+ .word BCFG1_VALUE
+BCFG2_ADR:
+ .word BCFG2
+_BCFG2_VALUE:
+ .word BCFG2_VALUE
+IO0DIR_ADR:
+ .word IO0DIR
+_IO0DIR_VALUE:
+ .word IO0_VALUE
+IO0SET_ADR:
+ .word IO0SET
+_IO0SET_VALUE:
+ .word IO0_VALUE
+PINSEL2_ADR:
+ .word PINSEL2
+PINSEL2_MASK:
+ .word 0x00000000
+PINSEL2_VALUE:
+ .word 0x0F804914
+
+.extern _start
+
+.globl lowlevel_init
+lowlevel_init:
+ /* set up memory control register for bank 0 */
+ ldr r0, _BCFG0_VALUE
+ ldr r1, BCFG0_ADR
+ str r0, [r1]
+
+ /* set up memory control register for bank 1 */
+ ldr r0, _BCFG1_VALUE
+ ldr r1, BCFG1_ADR
+ str r0, [r1]
+
+ /* set up memory control register for bank 2 */
+ ldr r0, _BCFG2_VALUE
+ ldr r1, BCFG2_ADR
+ str r0, [r1]
+
+ /* set IO0DIR to make P0.2, P0.3 and P0.18 outputs */
+ ldr r0, _IO0DIR_VALUE
+ ldr r1, IO0DIR_ADR
+ str r0, [r1]
+
+ /* set P0.18 to 1 */
+ ldr r0, _IO0SET_VALUE
+ ldr r1, IO0SET_ADR
+ str r0, [r1]
+
+ /* set up PINSEL2 for bus-pins */
+ ldr r0, PINSEL2_ADR
+ ldr r1, [r0]
+ ldr r2, PINSEL2_MASK
+ ldr r3, PINSEL2_VALUE
+ and r1, r1, r2
+ orr r1, r1, r3
+ str r1, [r0]
+
+ /* move vectors to beginning of SRAM */
+ mov r2, #SRAM_START
+ mov r0, #0 /*_start*/
+ ldmneia r0!, {r3-r10}
+ stmneia r2!, {r3-r10}
+ ldmneia r0, {r3-r9}
+ stmneia r2, {r3-r9}
+
+ /* Set-up MEMMAP register, so vectors are taken from SRAM */
+ ldr r0, MEMMAP_ADR
+ mov r1, #0x02 /* vectors re-mapped to static RAM */
+ str r1, [r0]
+
+ /* everything is fine now */
+ mov pc, lr