1*caab277bSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 24182de9eSLey Foon Tan /* Copyright Altera Corporation (C) 2014. All rights reserved. 34182de9eSLey Foon Tan */ 44182de9eSLey Foon Tan 54182de9eSLey Foon Tan #include <linux/module.h> 64182de9eSLey Foon Tan #include <asm/delay.h> 74182de9eSLey Foon Tan #include <asm/param.h> 84182de9eSLey Foon Tan #include <asm/processor.h> 94182de9eSLey Foon Tan #include <asm/timex.h> 104182de9eSLey Foon Tan __delay(unsigned long cycles)114182de9eSLey Foon Tanvoid __delay(unsigned long cycles) 124182de9eSLey Foon Tan { 134182de9eSLey Foon Tan cycles_t start = get_cycles(); 144182de9eSLey Foon Tan 154182de9eSLey Foon Tan while ((get_cycles() - start) < cycles) 164182de9eSLey Foon Tan cpu_relax(); 174182de9eSLey Foon Tan } 184182de9eSLey Foon Tan EXPORT_SYMBOL(__delay); 194182de9eSLey Foon Tan __const_udelay(unsigned long xloops)204182de9eSLey Foon Tanvoid __const_udelay(unsigned long xloops) 214182de9eSLey Foon Tan { 224182de9eSLey Foon Tan u64 loops; 234182de9eSLey Foon Tan 244182de9eSLey Foon Tan loops = (u64)xloops * loops_per_jiffy * HZ; 254182de9eSLey Foon Tan 264182de9eSLey Foon Tan __delay(loops >> 32); 274182de9eSLey Foon Tan } 284182de9eSLey Foon Tan EXPORT_SYMBOL(__const_udelay); 294182de9eSLey Foon Tan __udelay(unsigned long usecs)304182de9eSLey Foon Tanvoid __udelay(unsigned long usecs) 314182de9eSLey Foon Tan { 324182de9eSLey Foon Tan __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ 334182de9eSLey Foon Tan } 344182de9eSLey Foon Tan EXPORT_SYMBOL(__udelay); 354182de9eSLey Foon Tan __ndelay(unsigned long nsecs)364182de9eSLey Foon Tanvoid __ndelay(unsigned long nsecs) 374182de9eSLey Foon Tan { 384182de9eSLey Foon Tan __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ 394182de9eSLey Foon Tan } 404182de9eSLey Foon Tan EXPORT_SYMBOL(__ndelay); 41