1/* 2 * File: arch/blackfin/lib/ins.S 3 * Based on: 4 * Author: Bas Vermeulen <bas@buyways.nl> 5 * 6 * Created: Tue Mar 22 15:27:24 CEST 2005 7 * Description: Implementation of ins{bwl} for BlackFin processors using zero overhead loops. 8 * 9 * Modified: 10 * Copyright 2004-2006 Analog Devices Inc. 11 * Copyright (C) 2005 Bas Vermeulen, BuyWays BV <bas@buyways.nl> 12 * 13 * Bugs: Enter bugs at http://blackfin.uclinux.org/ 14 * 15 * This program is free software; you can redistribute it and/or modify 16 * it under the terms of the GNU General Public License as published by 17 * the Free Software Foundation; either version 2 of the License, or 18 * (at your option) any later version. 19 * 20 * This program is distributed in the hope that it will be useful, 21 * but WITHOUT ANY WARRANTY; without even the implied warranty of 22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 23 * GNU General Public License for more details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with this program; if not, see the file COPYING, or write 27 * to the Free Software Foundation, Inc., 28 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 29 */ 30 31#include <linux/linkage.h> 32#include <asm/blackfin.h> 33 34.align 2 35 36ENTRY(_insl) 37 P0 = R0; /* P0 = port */ 38 cli R3; 39 P1 = R1; /* P1 = address */ 40 P2 = R2; /* P2 = count */ 41 SSYNC; 42 LSETUP( .Llong_loop_s, .Llong_loop_e) LC0 = P2; 43.Llong_loop_s: R0 = [P0]; 44 [P1++] = R0; 45 NOP; 46.Llong_loop_e: NOP; 47 sti R3; 48 RTS; 49ENDPROC(_insl) 50 51ENTRY(_insw) 52 P0 = R0; /* P0 = port */ 53 cli R3; 54 P1 = R1; /* P1 = address */ 55 P2 = R2; /* P2 = count */ 56 SSYNC; 57 LSETUP( .Lword_loop_s, .Lword_loop_e) LC0 = P2; 58.Lword_loop_s: R0 = W[P0]; 59 W[P1++] = R0; 60 NOP; 61.Lword_loop_e: NOP; 62 sti R3; 63 RTS; 64ENDPROC(_insw) 65 66ENTRY(_insb) 67 P0 = R0; /* P0 = port */ 68 cli R3; 69 P1 = R1; /* P1 = address */ 70 P2 = R2; /* P2 = count */ 71 SSYNC; 72 LSETUP( .Lbyte_loop_s, .Lbyte_loop_e) LC0 = P2; 73.Lbyte_loop_s: R0 = B[P0]; 74 B[P1++] = R0; 75 NOP; 76.Lbyte_loop_e: NOP; 77 sti R3; 78 RTS; 79ENDPROC(_insb) 80