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Linux/arch/mips/lib/delay.c

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  1 /*
  2  * This file is subject to the terms and conditions of the GNU General Public
  3  * License.  See the file "COPYING" in the main directory of this archive
  4  * for more details.
  5  *
  6  * Copyright (C) 1994 by Waldorf Electronics
  7  * Copyright (C) 1995 - 2000, 01, 03 by Ralf Baechle
  8  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
  9  * Copyright (C) 2007  Maciej W. Rozycki
 10  */
 11 #include <linux/module.h>
 12 #include <linux/param.h>
 13 #include <linux/smp.h>
 14 
 15 #include <asm/compiler.h>
 16 #include <asm/war.h>
 17 
 18 void __delay(unsigned long loops)
 19 {
 20         __asm__ __volatile__ (
 21         "       .set    noreorder                               \n"
 22         "       .align  3                                       \n"
 23         "1:     bnez    %0, 1b                                  \n"
 24 #if BITS_PER_LONG == 32
 25         "       subu    %0, 1                                   \n"
 26 #else
 27         "       dsubu   %0, 1                                   \n"
 28 #endif
 29         "       .set    reorder                                 \n"
 30         : "=r" (loops)
 31         : "" (loops));
 32 }
 33 EXPORT_SYMBOL(__delay);
 34 
 35 /*
 36  * Division by multiplication: you don't have to worry about
 37  * loss of precision.
 38  *
 39  * Use only for very small delays ( < 1 msec).  Should probably use a
 40  * lookup table, really, as the multiplications take much too long with
 41  * short delays.  This is a "reasonable" implementation, though (and the
 42  * first constant multiplications gets optimized away if the delay is
 43  * a constant)
 44  */
 45 
 46 void __udelay(unsigned long us)
 47 {
 48         unsigned int lpj = raw_current_cpu_data.udelay_val;
 49 
 50         __delay((us * 0x000010c7ull * HZ * lpj) >> 32);
 51 }
 52 EXPORT_SYMBOL(__udelay);
 53 
 54 void __ndelay(unsigned long ns)
 55 {
 56         unsigned int lpj = raw_current_cpu_data.udelay_val;
 57 
 58         __delay((ns * 0x00000005ull * HZ * lpj) >> 32);
 59 }
 60 EXPORT_SYMBOL(__ndelay);
 61 

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