// SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/delay.h> void __aligned(8) __delay(unsigned long loops) { asm volatile ( "mov r0, r0\n" "1:declt %0\n" "bf 1b" : "=r"(loops) : "0"(loops)); } EXPORT_SYMBOL(__delay); void __const_udelay(unsigned long xloops) { unsigned long long loops; loops = (unsigned long long)xloops * loops_per_jiffy * HZ; __delay(loops >> 32); } EXPORT_SYMBOL(__const_udelay); void __udelay(unsigned long usecs) { __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ } EXPORT_SYMBOL(__udelay); void __ndelay(unsigned long nsecs) { __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ } EXPORT_SYMBOL(__ndelay);