| /* | |
| * (C) Copyright 2000, 2001 | |
| * Erik Theisen, Wave 7 Optics, etheisen@mindspring.com. | |
| * base on code by | |
| * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
| * | |
| * 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 | |
| */ | |
| #include <ppc_asm.tmpl> | |
| #include <ppc_defs.h> | |
| #include <config.h> | |
| #include <watchdog.h> | |
| /* | |
| * unsigned long long get_ticks(void); | |
| * | |
| * read timebase as "long long" | |
| */ | |
| .globl get_ticks | |
| get_ticks: | |
| 1: mftbu r3 | |
| mftb r4 | |
| mftbu r5 | |
| cmp 0,r3,r5 | |
| bne 1b | |
| blr | |
| /* | |
| * Delay for a number of ticks | |
| */ | |
| .globl wait_ticks | |
| wait_ticks: | |
| mflr r8 /* save link register */ | |
| mr r7, r3 /* save tick count */ | |
| bl get_ticks /* Get start time */ | |
| /* Calculate end time */ | |
| addc r7, r4, r7 /* Compute end time lower */ | |
| addze r6, r3 /* and end time upper */ | |
| WATCHDOG_RESET /* Trigger watchdog, if needed */ | |
| 1: bl get_ticks /* Get current time */ | |
| subfc r4, r4, r7 /* Subtract current time from end time */ | |
| subfe. r3, r3, r6 | |
| bge 1b /* Loop until time expired */ | |
| mtlr r8 /* restore link register */ | |
| blr |