Release 4.14 arch/mn10300/lib/delay.c

/* MN10300 Short delay interpolation routines
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <asm/div64.h>

/*
 * basic delay loop
 */


void __delay(unsigned long loops)
{
	int d0;

	asm volatile(
                "       bra     1f      \n"
                "       .align  4       \n"
                "1:     bra     2f      \n"
                "       .align  4       \n"
                "2:     add     -1,%0   \n"
                "       bne     2b      \n"
                : "=&d" (d0)
                : "0" (loops)
                : "cc");
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
14
93.33%
1
50.00%
Mark Salter
1
6.67%
1
50.00%
Total
15
100.00%
2
100.00%


EXPORT_SYMBOL(__delay);

/*
 * handle a delay specified in terms of microseconds
 */


void __udelay(unsigned long usecs)
{
	unsigned long start, stop, cnt;

	/* usecs * CLK / 1E6 */
	stop = __muldiv64u(usecs, MN10300_TSCCLK, 1000000);
	start = TMTSCBC;

	do {
		cnt = start - TMTSCBC;
	} while (cnt < stop);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
39
79.59%
1
50.00%
Akira Takeuchi
10
20.41%
1
50.00%
Total
49
100.00%
2
100.00%


EXPORT_SYMBOL(__udelay);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
78
87.64%
1
33.33%
Akira Takeuchi
10
11.24%
1
33.33%
Mark Salter
1
1.12%
1
33.33%
Total
89
100.00%
3
100.00%
Directory: arch/mn10300/lib

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.