Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* delay.c: Delay loops for sparc64 |
| 2 | * |
| 3 | * Copyright (C) 2004 David S. Miller <davem@redhat.com> |
| 4 | * |
| 5 | * Based heavily upon x86 variant which is: |
| 6 | * Copyright (C) 1993 Linus Torvalds |
| 7 | * Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz> |
| 8 | */ |
| 9 | |
| 10 | #include <linux/delay.h> |
| 11 | |
| 12 | void __delay(unsigned long loops) |
| 13 | { |
| 14 | __asm__ __volatile__( |
| 15 | " b,pt %%xcc, 1f\n" |
| 16 | " cmp %0, 0\n" |
| 17 | " .align 32\n" |
| 18 | "1:\n" |
| 19 | " bne,pt %%xcc, 1b\n" |
| 20 | " subcc %0, 1, %0\n" |
| 21 | : "=&r" (loops) |
| 22 | : "0" (loops) |
| 23 | : "cc"); |
| 24 | } |
| 25 | |
| 26 | /* We used to multiply by HZ after shifting down by 32 bits |
| 27 | * but that runs into problems for higher values of HZ and |
| 28 | * slow cpus. |
| 29 | */ |
| 30 | void __const_udelay(unsigned long n) |
| 31 | { |
| 32 | n *= 4; |
| 33 | |
| 34 | n *= (cpu_data(_smp_processor_id()).udelay_val * (HZ/4)); |
| 35 | n >>= 32; |
| 36 | |
| 37 | __delay(n + 1); |
| 38 | } |
| 39 | |
| 40 | void __udelay(unsigned long n) |
| 41 | { |
| 42 | __const_udelay(n * 0x10c7UL); |
| 43 | } |
| 44 | |
| 45 | |
| 46 | void __ndelay(unsigned long n) |
| 47 | { |
| 48 | __const_udelay(n * 0x5UL); |
| 49 | } |