| /* |
| * (C) Copyright 2002 |
| * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>. |
| * |
| * 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 |
| */ |
| |
| /* now setup the General purpose bus to give us access to the LEDs. |
| * We can then use the leds to display status information. |
| */ |
| |
| sc520_cdp_registers: |
| /* size offset value */ |
| .word 1 ; .word 0x040 ; .long 0x00 /* SDRAM buffer control */ |
| .word 2 ; .word 0xc08 ; .long 0x0001 /* GP CS offset */ |
| .word 2 ; .word 0xc09 ; .long 0x0003 /* GP CS width */ |
| .word 2 ; .word 0xc0a ; .long 0x0001 /* GP CS width */ |
| .word 2 ; .word 0xc0b ; .long 0x0003 /* GP RD pulse width */ |
| .word 2 ; .word 0xc0c ; .long 0x0001 /* GP RD offse */ |
| .word 2 ; .word 0xc0d ; .long 0x0003 /* GP WR pulse width */ |
| .word 2 ; .word 0xc0e ; .long 0x0001 /* GP WR offset */ |
| .word 2 ; .word 0xc2c ; .long 0x0000 /* GPIO directionreg */ |
| .word 2 ; .word 0xc2a ; .long 0x0000 /* GPIO directionreg */ |
| .word 2 ; .word 0xc22 ; .long 0xffff /* GPIO pin function 31-16 reg */ |
| .word 2 ; .word 0xc20 ; .long 0xffff /* GPIO pin function 15-0 reg */ |
| .word 2 ; .word 0x0c4 ; .long 0x28000680 /* PAR 15 for access to led 680 */ |
| .word 0 ; .word 0x000 ; .long 0x00 |
| |
| /* board early intialization */ |
| .globl early_board_init |
| early_board_init: |
| movl $sc520_cdp_registers,%esi |
| init_loop: |
| movl $0xfffef000,%edi /* MMCR base to edi */ |
| movw (%esi), %bx /* load sizer to bx */ |
| cmpw $0, %bx /* if sie is 0 we're done */ |
| je done |
| xorl %edx,%edx |
| movw 2(%esi), %dx /* load MMCR offset to dx */ |
| addl %edx, %edi /* add offset to base in edi */ |
| movl 4(%esi), %eax /* load value in eax */ |
| cmpw $1, %bx |
| je byte /* byte op? */ |
| cmpw $2, %bx |
| je word /* word op? */ |
| movl %eax, (%edi) /* must be long, then */ |
| jmp next |
| byte: movb %al,(%edi) |
| jmp next |
| word: movw %ax,(%edi) |
| next: addl $8, %esi /* advance esi */ |
| jmp init_loop |
| |
| /* the leds ad 0x80 and 0x680 should now work */ |
| done: movb $0x88, %al |
| out %al, $0x80 |
| movw $0x680, %dx |
| out %al, %dx |
| |
| jmp *%ebp /* return to caller */ |
| |
| |
| .globl __show_boot_progress |
| __show_boot_progress: |
| out %al, $0x80 |
| xchg %al, %ah |
| movw $0x680, %dx |
| out %al, %dx |
| jmp *%ebp |
