| /* | |
| * U-boot - delay.h Routines for introducing delays | |
| * | |
| * Copyright (c) 2005-2007 Analog Devices Inc. | |
| * | |
| * 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., 51 Franklin St, Fifth Floor, Boston, | |
| * MA 02110-1301 USA | |
| */ | |
| #ifndef _BLACKFIN_DELAY_H | |
| #define _BLACKFIN_DELAY_H | |
| /* | |
| * Changes made by akbar.hussain@Lineo.com, for BLACKFIN | |
| * Copyright (C) 1994 Hamish Macdonald | |
| * | |
| * Delay routines, using a pre-computed "loops_per_second" value. | |
| */ | |
| extern __inline__ void __delay(unsigned long loops) | |
| { | |
| __asm__ __volatile__("1:\t%0 += -1;\n\t" | |
| "cc = %0 == 0;\n\t" | |
| "if ! cc jump 1b;\n":"=d"(loops) | |
| :"0"(loops)); | |
| } | |
| /* | |
| * Use only for very small delays ( < 1 msec). Should probably use a | |
| * lookup table, really, as the multiplications take much too long with | |
| * short delays. This is a "reasonable" implementation, though (and the | |
| * first constant multiplications gets optimized away if the delay is | |
| * a constant) | |
| */ | |
| extern __inline__ void __udelay(unsigned long usecs) | |
| { | |
| __delay(usecs); | |
| } | |
| #endif |