arm64: dts: Revert "specify console via command line"
[linux/fpc-iii.git] / arch / csky / lib / delay.c
blob22570b0790d6fb9436e389a51c16833974c7b547
1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
3 #include <linux/kernel.h>
4 #include <linux/module.h>
5 #include <linux/init.h>
6 #include <linux/delay.h>
8 void __delay(unsigned long loops)
10 asm volatile (
11 "mov r0, r0\n"
12 "1:declt %0\n"
13 "bf 1b"
14 : "=r"(loops)
15 : "0"(loops));
17 EXPORT_SYMBOL(__delay);
19 void __const_udelay(unsigned long xloops)
21 unsigned long long loops;
23 loops = (unsigned long long)xloops * loops_per_jiffy * HZ;
25 __delay(loops >> 32);
27 EXPORT_SYMBOL(__const_udelay);
29 void __udelay(unsigned long usecs)
31 __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */
33 EXPORT_SYMBOL(__udelay);
35 void __ndelay(unsigned long nsecs)
37 __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */
39 EXPORT_SYMBOL(__ndelay);