[linux-2.6-block.git] / arch / csky / lib / delay.c

// 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 __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);
Commit	Line	Data
c5af58b7 GR	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>
	7
	8	void __delay(unsigned long loops)
	9	{
	10	asm volatile (
	11	"mov r0, r0\n"
	12	"1:declt %0\n"
	13	"bf 1b"
	14	: "=r"(loops)
	15	: "0"(loops));
	16	}
	17	EXPORT_SYMBOL(__delay);
	18
	19	void __const_udelay(unsigned long xloops)
	20	{
	21	unsigned long long loops;
	22
	23	loops = (unsigned long long)xloops * loops_per_jiffy * HZ;
	24
	25	__delay(loops >> 32);
	26	}
	27	EXPORT_SYMBOL(__const_udelay);
	28
	29	void __udelay(unsigned long usecs)
	30	{
	31	__const_udelay(usecs * 0x10C7UL); /* 2*32 / 1000000 (rounded up) /
	32	}
	33	EXPORT_SYMBOL(__udelay);
	34
	35	void __ndelay(unsigned long nsecs)
	36	{
	37	__const_udelay(nsecs * 0x5UL); /* 2*32 / 1000000000 (rounded up) /
	38	}
	39	EXPORT_SYMBOL(__ndelay);