1 // SPDX-License-Identifier: GPL-2.0-only !! 1 /* 2 /* Copyright Altera Corporation (C) 2014. All !! 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 3 */ 10 */ 4 << 5 #include <linux/module.h> 11 #include <linux/module.h> 6 #include <asm/delay.h> !! 12 #include <linux/param.h> 7 #include <asm/param.h> !! 13 #include <linux/smp.h> 8 #include <asm/processor.h> << 9 #include <asm/timex.h> << 10 14 11 void __delay(unsigned long cycles) !! 15 #include <asm/compiler.h> 12 { !! 16 #include <asm/war.h> 13 cycles_t start = get_cycles(); << 14 17 15 while ((get_cycles() - start) < cycles !! 18 inline void __delay(unsigned int loops) 16 cpu_relax(); !! 19 { >> 20 __asm__ __volatile__ ( >> 21 " .set noreorder \n" >> 22 " .align 3 \n" >> 23 "1: bnez %0, 1b \n" >> 24 " subu %0, 1 \n" >> 25 " .set reorder \n" >> 26 : "=r" (loops) >> 27 : "" (loops)); 17 } 28 } 18 EXPORT_SYMBOL(__delay); 29 EXPORT_SYMBOL(__delay); 19 30 20 void __const_udelay(unsigned long xloops) !! 31 /* 21 { !! 32 * Division by multiplication: you don't have to worry about 22 u64 loops; !! 33 * loss of precision. 23 !! 34 * 24 loops = (u64)xloops * loops_per_jiffy !! 35 * Use only for very small delays ( < 1 msec). Should probably use a 25 !! 36 * lookup table, really, as the multiplications take much too long with 26 __delay(loops >> 32); !! 37 * short delays. This is a "reasonable" implementation, though (and the 27 } !! 38 * first constant multiplications gets optimized away if the delay is 28 EXPORT_SYMBOL(__const_udelay); !! 39 * a constant) >> 40 */ 29 41 30 void __udelay(unsigned long usecs) !! 42 void __udelay(unsigned long us) 31 { 43 { 32 __const_udelay(usecs * 0x10C7UL); /* 2 !! 44 unsigned int lpj = current_cpu_data.udelay_val; >> 45 >> 46 __delay((us * 0x000010c7ull * HZ * lpj) >> 32); 33 } 47 } 34 EXPORT_SYMBOL(__udelay); 48 EXPORT_SYMBOL(__udelay); 35 49 36 void __ndelay(unsigned long nsecs) !! 50 void __ndelay(unsigned long ns) 37 { 51 { 38 __const_udelay(nsecs * 0x5UL); /* 2**3 !! 52 unsigned int lpj = current_cpu_data.udelay_val; >> 53 >> 54 __delay((ns * 0x00000005ull * HZ * lpj) >> 32); 39 } 55 } 40 EXPORT_SYMBOL(__ndelay); 56 EXPORT_SYMBOL(__ndelay); 41 57
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