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d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
96cf5185 G |
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 | |
96cf5185 G |
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 | ||
23 | ENTRY(__udelay) | |
24 | ldw r2, .LC1 | |
25 | mul r0, r2, r0 | |
26 | ENTRY(__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 | |
42 | ENTRY(__delay) | |
43 | sub.a r0, r0, #2 | |
44 | bua __delay | |
45 | mov pc, lr | |
46 | ENDPROC(__udelay) | |
47 | ENDPROC(__const_udelay) | |
48 | ENDPROC(__delay) |