1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * linux/arch/unicore32/lib/delay.S
 4 *
 5 * Code specific to PKUnity SoC and UniCore ISA
 6 *
 7 * Copyright (C) 2001-2010 GUAN Xue-tao
 8 */
 9#include <linux/linkage.h>
10#include <asm/assembler.h>
11#include <asm/param.h>
12		.text
13
14.LC0:		.word	loops_per_jiffy
15.LC1:		.word	(2199023*HZ)>>11
16
17/*
18 * r0  <= 2000
19 * lpj <= 0x01ffffff (max. 3355 bogomips)
20 * HZ  <= 1000
21 */
22
23ENTRY(__udelay)
24		ldw	r2, .LC1
25		mul	r0, r2, r0
26ENTRY(__const_udelay)				@ 0 <= r0 <= 0x7fffff06
27		ldw	r2, .LC0
28		ldw	r2, [r2]		@ max = 0x01ffffff
29		mov	r0, r0 >> #14		@ max = 0x0001ffff
30		mov	r2, r2 >> #10		@ max = 0x00007fff
31		mul	r0, r2, r0		@ max = 2^32-1
32		mov.a	r0, r0 >> #6
33		cmoveq	pc, lr
34
35/*
36 * loops = r0 * HZ * loops_per_jiffy / 1000000
37 *
38 * Oh, if only we had a cycle counter...
39 */
40
41@ Delay routine
42ENTRY(__delay)
43		sub.a	r0, r0, #2
44		bua	__delay
45		mov	pc, lr
46ENDPROC(__udelay)
47ENDPROC(__const_udelay)
48ENDPROC(__delay)