/* * (C) Copyright 2002 * Daniel Engstr�m, 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