Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * arch/sh64/lib/udelay.c

 *

 * Delay routines, using a pre-computed "loops_per_jiffy" value.

 *

 * Copyright (C) 2000, 2001  Paolo Alberelli

 * Copyright (C) 2003, 2004  Paul Mundt

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 */

#include <linux/sched.h>

#include <asm/param.h>

extern unsigned long loops_per_jiffy;

/*

 * Use only for very small delays (< 1 msec).

 *

 * The active part of our cycle counter is only 32-bits wide, and

 * we're treating the difference between two marks as signed.  On

 * a 1GHz box, that's about 2 seconds.

 */

void __delay(int loops)

{

        long long dummy;

        __asm__ __volatile__("gettr     tr0, %1\n\t"

                             "pta       $+4, tr0\n\t"

                             "addi      %0, -1, %0\n\t"

                             "bne       %0, r63, tr0\n\t"

                             "ptabs     %1, tr0\n\t":"=r"(loops),

                             "=r"(dummy)

                             :"0"(loops));

}

void __udelay(unsigned long long usecs, unsigned long lpj)

{

        usecs *= (((unsigned long long) HZ << 32) / 1000000) * lpj;

        __delay((long long) usecs >> 32);

}

void __ndelay(unsigned long long nsecs, unsigned long lpj)

{

        nsecs *= (((unsigned long long) HZ << 32) / 1000000000) * lpj;

        __delay((long long) nsecs >> 32);

}

void udelay(unsigned long usecs)

{

        __udelay(usecs, loops_per_jiffy);

}

void ndelay(unsigned long nsecs)

{

        __ndelay(nsecs, loops_per_jiffy);

}