| Graeme Russ | e56d397 | 2008-12-07 10:28:57 +1100 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2008 |
| 3 | * Graeme Russ, graeme.russ@gmail.com. |
| 4 | * |
| 5 | * See file CREDITS for list of people who contributed to this |
| 6 | * project. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation; either version 2 of |
| 11 | * the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 21 | * MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * 16bit initialization code. |
| 26 | * This code have to map the area of the boot flash |
| 27 | * that is used by U-boot to its final destination. |
| 28 | */ |
| 29 | |
| 30 | /* #include <asm/ic/sc520_defs.h> */ |
| 31 | |
| 32 | #include "hardware.h" |
| Graeme Russ | b112bca | 2011-02-12 15:11:36 +1100 | [diff] [blame] | 33 | #include <asm/ic/sc520.h> |
| Graeme Russ | e56d397 | 2008-12-07 10:28:57 +1100 | [diff] [blame] | 34 | |
| 35 | .text |
| 36 | .section .start16, "ax" |
| 37 | .code16 |
| 38 | .globl board_init16 |
| 39 | board_init16: |
| 40 | /* Alias MMCR to 0xdf000 */ |
| 41 | movw $0xfffc, %dx |
| 42 | movl $0x800df0cb, %eax |
| 43 | outl %eax, %dx |
| 44 | |
| 45 | /* Set ds to point to MMCR alias */ |
| 46 | movw $0xdf00, %ax |
| 47 | movw %ax, %ds |
| 48 | |
| 49 | /* Map PAR for Boot Flash (BOOTCS, 512kB @ 0x380000000) */ |
| Graeme Russ | b112bca | 2011-02-12 15:11:36 +1100 | [diff] [blame] | 50 | movl $(SC520_PAR14 - SC520_MMCR_BASE), %edi |
| Graeme Russ | e56d397 | 2008-12-07 10:28:57 +1100 | [diff] [blame] | 51 | movl $0x8bfff800, %eax /* TODO: Check this */ |
| 52 | movl %eax, (%di) |
| 53 | |
| 54 | /* Map PAR for LED, Hex Switches (GPCS6, 20 Bytes @ 0x1000) */ |
| Graeme Russ | b112bca | 2011-02-12 15:11:36 +1100 | [diff] [blame] | 55 | movl $(SC520_PAR15 - SC520_MMCR_BASE), %edi |
| Graeme Russ | e56d397 | 2008-12-07 10:28:57 +1100 | [diff] [blame] | 56 | movl $0x38201000, %eax |
| 57 | movl %eax, (%di) |
| 58 | |
| 59 | /* Disable SDRAM write buffer */ |
| Graeme Russ | b112bca | 2011-02-12 15:11:36 +1100 | [diff] [blame] | 60 | movw $(SC520_DBCTL - SC520_MMCR_BASE), %di |
| Graeme Russ | e56d397 | 2008-12-07 10:28:57 +1100 | [diff] [blame] | 61 | xorw %ax, %ax |
| 62 | movb %al, (%di) |
| 63 | |
| 64 | /* Disabe MMCR alias */ |
| 65 | movw $0xfffc, %dx |
| 66 | movl $0x000000cb, %eax |
| 67 | outl %eax, %dx |
| 68 | |
| Graeme Russ | 157b0e9 | 2010-10-07 20:03:27 +1100 | [diff] [blame] | 69 | jmp board_init16_ret |
| Graeme Russ | e56d397 | 2008-12-07 10:28:57 +1100 | [diff] [blame] | 70 | |
| 71 | .section .bios, "ax" |
| 72 | .code16 |
| 73 | .globl realmode_reset |
| Graeme Russ | 1aafcc9 | 2009-11-24 20:04:19 +1100 | [diff] [blame] | 74 | .hidden realmode_reset |
| 75 | .type realmode_reset, @function |
| Graeme Russ | e56d397 | 2008-12-07 10:28:57 +1100 | [diff] [blame] | 76 | realmode_reset: |
| 77 | /* Alias MMCR to 0xdf000 */ |
| 78 | movw $0xfffc, %dx |
| 79 | movl $0x800df0cb, %eax |
| 80 | outl %eax, %dx |
| 81 | |
| 82 | /* Set ds to point to MMCR alias */ |
| 83 | movw $0xdf00, %ax |
| 84 | movw %ax, %ds |
| 85 | |
| 86 | /* issue software reset thorugh MMCR */ |
| 87 | movl $0xd72, %edi |
| 88 | movb $0x01, %al |
| 89 | movb %al, (%di) |
| 90 | |
| 91 | 1: hlt |
| 92 | jmp 1 |