| /* | |
| * linux/arch/arm26/lib/delay.S | |
| * | |
| * Copyright (C) 1995, 1996 Russell King | |
| * | |
| * This program is free software; you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License version 2 as | |
| * published by the Free Software Foundation. | |
| */ | |
| #include <linux/linkage.h> | |
| #include <asm/assembler.h> | |
| .text | |
| LC0: .word loops_per_jiffy | |
| /* | |
| * 0 <= r0 <= 2000 | |
| */ | |
| ENTRY(udelay) | |
| mov r2, #0x6800 | |
| orr r2, r2, #0x00db | |
| mul r1, r0, r2 | |
| ldr r2, LC0 | |
| ldr r2, [r2] | |
| mov r1, r1, lsr #11 | |
| mov r2, r2, lsr #11 | |
| mul r0, r1, r2 | |
| movs r0, r0, lsr #6 | |
| RETINSTR(moveq,pc,lr) | |
| /* | |
| * loops = (r0 * 0x10c6 * 100 * loops_per_jiffy) / 2^32 | |
| * | |
| * Oh, if only we had a cycle counter... | |
| */ | |
| @ Delay routine | |
| ENTRY(__delay) | |
| subs r0, r0, #1 | |
| #if 0 | |
| RETINSTR(movls,pc,lr) | |
| subs r0, r0, #1 | |
| RETINSTR(movls,pc,lr) | |
| subs r0, r0, #1 | |
| RETINSTR(movls,pc,lr) | |
| subs r0, r0, #1 | |
| RETINSTR(movls,pc,lr) | |
| subs r0, r0, #1 | |
| RETINSTR(movls,pc,lr) | |
| subs r0, r0, #1 | |
| RETINSTR(movls,pc,lr) | |
| subs r0, r0, #1 | |
| RETINSTR(movls,pc,lr) | |
| subs r0, r0, #1 | |
| #endif | |
| bhi __delay | |
| RETINSTR(mov,pc,lr) |