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/*
* (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_asm
show_boot_progress_asm:
out %al, $0x80
xchg %al, %ah
movw $0x680, %dx
out %al, %dx
jmp *%ebp
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