| wdenk | 43c377f | 2002-07-20 10:56:28 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Memory Setup stuff - taken from ??? |
| 3 | * |
| 4 | * See file CREDITS for list of people who contributed to this |
| 5 | * project. |
| 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 | |
| wdenk | 43c377f | 2002-07-20 10:56:28 +0000 | [diff] [blame] | 24 | #include <config.h> |
| 25 | #include <version.h> |
| 26 | |
| 27 | |
| 28 | /* some parameters for the board */ |
| 29 | |
| 30 | SYSCON2: .long 0x80001100 |
| 31 | MEMCFG1: .long 0x80000180 |
| 32 | MEMCFG2: .long 0x800001C0 |
| 33 | DRFPR: .long 0x80000200 |
| 34 | |
| 35 | syscon2_mask: .long 0x00000004 |
| 36 | memcfg1_val: .long 0x160c1414 |
| 37 | memcfg2_mask: .long 0x0000ffff @ only set lower 16 bits |
| 38 | memcfg2_val: .long 0x00000000 @ upper 16 bits are reserved for CS7 + CS6 |
| 39 | drfpr_val: .long 0x00000081 |
| 40 | /* setting up the memory */ |
| 41 | |
| wdenk | 400558b | 2005-04-02 23:52:25 +0000 | [diff] [blame] | 42 | .globl lowlevel_init |
| 43 | lowlevel_init: |
| wdenk | 43c377f | 2002-07-20 10:56:28 +0000 | [diff] [blame] | 44 | /* |
| 45 | * DRFPR |
| 46 | * 64kHz DRAM refresh |
| 47 | */ |
| 48 | ldr r0, DRFPR |
| 49 | ldr r1, drfpr_val |
| 50 | str r1, [r0] |
| 51 | |
| 52 | /* |
| 53 | * SYSCON2: clear bit 2, DRAM is 32 bits wide |
| 54 | */ |
| 55 | ldr r0, SYSCON2 |
| 56 | ldr r2, [r0] |
| 57 | ldr r1, syscon2_mask |
| 58 | bic r2, r2, r1 |
| 59 | str r2, [r0] |
| 60 | |
| 61 | /* |
| 62 | * MEMCFG1 |
| 63 | * Setting up Keyboard at CS3, 8 Bit, 3 Waitstates |
| 64 | * Setting up CS8900 (Ethernet) at CS2, 32 Bit, 5 Waitstates |
| 65 | * Setting up flash at CS0 and CS1, 32 Bit, 3 Waitstates |
| 66 | */ |
| 67 | ldr r0, MEMCFG1 |
| 68 | ldr r1, memcfg1_val |
| 69 | str r1, [r0] |
| 70 | |
| 71 | /* |
| 72 | * MEMCFG2 |
| 73 | * Setting up ? with 0 |
| 74 | * |
| 75 | */ |
| 76 | ldr r0, MEMCFG2 |
| 77 | ldr r2, [r0] |
| 78 | ldr r1, memcfg2_mask |
| 79 | bic r2, r2, r1 |
| 80 | ldr r1, memcfg2_val |
| 81 | orr r2, r2, r1 |
| 82 | str r2, [r0] |
| 83 | |
| 84 | /* everything is fine now */ |
| 85 | mov pc, lr |