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- /*
- * (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
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