diff options
Diffstat (limited to 'board/sc520_cdp/sc520_cdp_asm.S')
| -rw-r--r-- | board/sc520_cdp/sc520_cdp_asm.S | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/board/sc520_cdp/sc520_cdp_asm.S b/board/sc520_cdp/sc520_cdp_asm.S new file mode 100644 index 0000000..1e255fa --- /dev/null +++ b/board/sc520_cdp/sc520_cdp_asm.S @@ -0,0 +1,86 @@ +/* + * (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 + |