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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/lib/delay.S | |
3 | * | |
4 | * Copyright (C) 1995, 1996 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/linkage.h> | |
11 | #include <asm/assembler.h> | |
d0a533b1 | 12 | #include <asm/delay.h> |
215e362d | 13 | |
1da177e4 LT |
14 | .text |
15 | ||
8adbb371 | 16 | .LC0: .word loops_per_jiffy |
d0a533b1 | 17 | .LC1: .word UDELAY_MULT |
1da177e4 LT |
18 | |
19 | /* | |
6d4518d7 | 20 | * r0 <= 2000 |
6d4518d7 | 21 | * HZ <= 1000 |
1da177e4 | 22 | */ |
6d4518d7 | 23 | |
d0a533b1 | 24 | ENTRY(__loop_udelay) |
6d4518d7 | 25 | ldr r2, .LC1 |
1da177e4 | 26 | mul r0, r2, r0 |
d0a533b1 | 27 | ENTRY(__loop_const_udelay) @ 0 <= r0 <= 0x7fffff06 |
8adbb371 | 28 | ldr r2, .LC0 |
215e362d NP |
29 | ldr r2, [r2] |
30 | umull r1, r0, r2, r0 | |
31 | adds r1, r1, #0xffffffff | |
32 | adcs r0, r0, r0 | |
6ebbf2ce | 33 | reteq lr |
1da177e4 LT |
34 | |
35 | /* | |
6d4518d7 | 36 | * loops = r0 * HZ * loops_per_jiffy / 1000000 |
1da177e4 | 37 | */ |
11d4bb1b | 38 | .align 3 |
1da177e4 LT |
39 | |
40 | @ Delay routine | |
d0a533b1 | 41 | ENTRY(__loop_delay) |
1da177e4 LT |
42 | subs r0, r0, #1 |
43 | #if 0 | |
6ebbf2ce | 44 | retls lr |
1da177e4 | 45 | subs r0, r0, #1 |
6ebbf2ce | 46 | retls lr |
1da177e4 | 47 | subs r0, r0, #1 |
6ebbf2ce | 48 | retls lr |
1da177e4 | 49 | subs r0, r0, #1 |
6ebbf2ce | 50 | retls lr |
1da177e4 | 51 | subs r0, r0, #1 |
6ebbf2ce | 52 | retls lr |
1da177e4 | 53 | subs r0, r0, #1 |
6ebbf2ce | 54 | retls lr |
1da177e4 | 55 | subs r0, r0, #1 |
6ebbf2ce | 56 | retls lr |
1da177e4 LT |
57 | subs r0, r0, #1 |
58 | #endif | |
d0a533b1 | 59 | bhi __loop_delay |
6ebbf2ce | 60 | ret lr |
d0a533b1 WD |
61 | ENDPROC(__loop_udelay) |
62 | ENDPROC(__loop_const_udelay) | |
63 | ENDPROC(__loop_delay) |