| Peter Pearse | b180529 | 2007-05-09 11:42:44 +0100 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2006 Embedded Artists AB <www.embeddedartists.com> |
| 3 | * |
| 4 | * Slight modifications made to support the SMN42 board from Siemens. |
| 5 | * 2007 Gary Jennejohn garyj@denx.de |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License as |
| 9 | * published by the Free Software Foundation; either version 2 of |
| 10 | * the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 20 | * MA 02111-1307 USA |
| 21 | */ |
| 22 | |
| 23 | #include <config.h> |
| 24 | #include <version.h> |
| 25 | #include <asm/arch/hardware.h> |
| 26 | |
| 27 | /* some parameters for the board */ |
| 28 | /* setting up the CPU-internal memory */ |
| 29 | #define SRAM_START 0x40000000 |
| 30 | #define SRAM_SIZE 0x00004000 |
| 31 | #define BCFG0_VALUE 0x1000ffef |
| 32 | #define BCFG1_VALUE 0x10005D2F |
| 33 | #define BCFG2_VALUE 0x10005D2F |
| 34 | /* |
| 35 | * For P0.18 to set ZZ to the SRAMs to 1. Also set P0.2 (SCL) and P0.3 (SDA) |
| 36 | * for the bit-banger I2C driver correctly. |
| 37 | */ |
| 38 | #define IO0_VALUE 0x4000C |
| 39 | |
| 40 | _TEXT_BASE: |
| 41 | .word TEXT_BASE |
| 42 | MEMMAP_ADR: |
| 43 | .word MEMMAP |
| 44 | BCFG0_ADR: |
| 45 | .word BCFG0 |
| 46 | _BCFG0_VALUE: |
| 47 | .word BCFG0_VALUE |
| 48 | BCFG1_ADR: |
| 49 | .word BCFG1 |
| 50 | _BCFG1_VALUE: |
| 51 | .word BCFG1_VALUE |
| 52 | BCFG2_ADR: |
| 53 | .word BCFG2 |
| 54 | _BCFG2_VALUE: |
| 55 | .word BCFG2_VALUE |
| 56 | IO0DIR_ADR: |
| 57 | .word IO0DIR |
| 58 | _IO0DIR_VALUE: |
| 59 | .word IO0_VALUE |
| 60 | IO0SET_ADR: |
| 61 | .word IO0SET |
| 62 | _IO0SET_VALUE: |
| 63 | .word IO0_VALUE |
| 64 | PINSEL2_ADR: |
| 65 | .word PINSEL2 |
| 66 | PINSEL2_MASK: |
| 67 | .word 0x00000000 |
| 68 | PINSEL2_VALUE: |
| 69 | .word 0x0F804914 |
| 70 | |
| 71 | .extern _start |
| 72 | |
| 73 | .globl lowlevel_init |
| 74 | lowlevel_init: |
| 75 | /* set up memory control register for bank 0 */ |
| 76 | ldr r0, _BCFG0_VALUE |
| 77 | ldr r1, BCFG0_ADR |
| 78 | str r0, [r1] |
| 79 | |
| 80 | /* set up memory control register for bank 1 */ |
| 81 | ldr r0, _BCFG1_VALUE |
| 82 | ldr r1, BCFG1_ADR |
| 83 | str r0, [r1] |
| 84 | |
| 85 | /* set up memory control register for bank 2 */ |
| 86 | ldr r0, _BCFG2_VALUE |
| 87 | ldr r1, BCFG2_ADR |
| 88 | str r0, [r1] |
| 89 | |
| 90 | /* set IO0DIR to make P0.2, P0.3 and P0.18 outputs */ |
| 91 | ldr r0, _IO0DIR_VALUE |
| 92 | ldr r1, IO0DIR_ADR |
| 93 | str r0, [r1] |
| 94 | |
| 95 | /* set P0.18 to 1 */ |
| 96 | ldr r0, _IO0SET_VALUE |
| 97 | ldr r1, IO0SET_ADR |
| 98 | str r0, [r1] |
| 99 | |
| 100 | /* set up PINSEL2 for bus-pins */ |
| 101 | ldr r0, PINSEL2_ADR |
| 102 | ldr r1, [r0] |
| 103 | ldr r2, PINSEL2_MASK |
| 104 | ldr r3, PINSEL2_VALUE |
| 105 | and r1, r1, r2 |
| 106 | orr r1, r1, r3 |
| 107 | str r1, [r0] |
| 108 | |
| 109 | /* move vectors to beginning of SRAM */ |
| 110 | mov r2, #SRAM_START |
| 111 | mov r0, #0 /*_start*/ |
| 112 | ldmneia r0!, {r3-r10} |
| 113 | stmneia r2!, {r3-r10} |
| 114 | ldmneia r0, {r3-r9} |
| 115 | stmneia r2, {r3-r9} |
| 116 | |
| 117 | /* Set-up MEMMAP register, so vectors are taken from SRAM */ |
| 118 | ldr r0, MEMMAP_ADR |
| 119 | mov r1, #0x02 /* vectors re-mapped to static RAM */ |
| 120 | str r1, [r0] |
| 121 | |
| 122 | /* everything is fine now */ |
| 123 | mov pc, lr |