2 * File: arch/blackfin/lib/outs.S
4 * Author: Bas Vermeulen <bas@buyways.nl>
6 * Created: Tue Mar 22 15:27:24 CEST 2005
7 * Description: Implementation of outs{bwl} for BlackFin processors using zero overhead loops.
9 * Modified: Copyright (C) 2005 Bas Vermeulen, BuyWays BV <bas@buyways.nl>
10 * Copyright 2004-2006 Analog Devices Inc.
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see the file COPYING, or write
26 * to the Free Software Foundation, Inc.,
27 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
30 #include <linux/linkage.h>
35 P0 = R0; /* P0 = port */
36 P1 = R1; /* P1 = address */
37 P2 = R2; /* P2 = count */
39 LSETUP( .Llong_loop_s, .Llong_loop_e) LC0 = P2;
40 .Llong_loop_s: R0 = [P1++];
41 .Llong_loop_e: [P0] = R0;
46 P0 = R0; /* P0 = port */
47 P1 = R1; /* P1 = address */
48 P2 = R2; /* P2 = count */
50 LSETUP( .Lword_loop_s, .Lword_loop_e) LC0 = P2;
51 .Lword_loop_s: R0 = W[P1++];
52 .Lword_loop_e: W[P0] = R0;
57 P0 = R0; /* P0 = port */
58 P1 = R1; /* P1 = address */
59 P2 = R2; /* P2 = count */
61 LSETUP( .Lbyte_loop_s, .Lbyte_loop_e) LC0 = P2;
62 .Lbyte_loop_s: R0 = B[P1++];
63 .Lbyte_loop_e: B[P0] = R0;