diff options
Diffstat (limited to 'include/asm-ppc/delay.h')
-rw-r--r-- | include/asm-ppc/delay.h | 66 |
1 files changed, 0 insertions, 66 deletions
diff --git a/include/asm-ppc/delay.h b/include/asm-ppc/delay.h deleted file mode 100644 index badde6845af2..000000000000 --- a/include/asm-ppc/delay.h +++ /dev/null | |||
@@ -1,66 +0,0 @@ | |||
1 | #ifdef __KERNEL__ | ||
2 | #ifndef _PPC_DELAY_H | ||
3 | #define _PPC_DELAY_H | ||
4 | |||
5 | #include <asm/param.h> | ||
6 | |||
7 | /* | ||
8 | * Copyright 1996, Paul Mackerras. | ||
9 | * | ||
10 | * This program is free software; you can redistribute it and/or | ||
11 | * modify it under the terms of the GNU General Public License | ||
12 | * as published by the Free Software Foundation; either version | ||
13 | * 2 of the License, or (at your option) any later version. | ||
14 | */ | ||
15 | |||
16 | extern unsigned long loops_per_jiffy; | ||
17 | |||
18 | extern void __delay(unsigned int loops); | ||
19 | |||
20 | /* | ||
21 | * Note that 19 * 226 == 4294 ==~ 2^32 / 10^6, so | ||
22 | * loops = (4294 * usecs * loops_per_jiffy * HZ) / 2^32. | ||
23 | * | ||
24 | * The mulhwu instruction gives us loops = (a * b) / 2^32. | ||
25 | * We choose a = usecs * 19 * HZ and b = loops_per_jiffy * 226 | ||
26 | * because this lets us support a wide range of HZ and | ||
27 | * loops_per_jiffy values without either a or b overflowing 2^32. | ||
28 | * Thus we need usecs * HZ <= (2^32 - 1) / 19 = 226050910 and | ||
29 | * loops_per_jiffy <= (2^32 - 1) / 226 = 19004280 | ||
30 | * (which corresponds to ~3800 bogomips at HZ = 100). | ||
31 | * -- paulus | ||
32 | */ | ||
33 | #define __MAX_UDELAY (226050910UL/HZ) /* maximum udelay argument */ | ||
34 | #define __MAX_NDELAY (4294967295UL/HZ) /* maximum ndelay argument */ | ||
35 | |||
36 | extern __inline__ void __udelay(unsigned int x) | ||
37 | { | ||
38 | unsigned int loops; | ||
39 | |||
40 | __asm__("mulhwu %0,%1,%2" : "=r" (loops) : | ||
41 | "r" (x), "r" (loops_per_jiffy * 226)); | ||
42 | __delay(loops); | ||
43 | } | ||
44 | |||
45 | extern __inline__ void __ndelay(unsigned int x) | ||
46 | { | ||
47 | unsigned int loops; | ||
48 | |||
49 | __asm__("mulhwu %0,%1,%2" : "=r" (loops) : | ||
50 | "r" (x), "r" (loops_per_jiffy * 5)); | ||
51 | __delay(loops); | ||
52 | } | ||
53 | |||
54 | extern void __bad_udelay(void); /* deliberately undefined */ | ||
55 | extern void __bad_ndelay(void); /* deliberately undefined */ | ||
56 | |||
57 | #define udelay(n) (__builtin_constant_p(n)? \ | ||
58 | ((n) > __MAX_UDELAY? __bad_udelay(): __udelay((n) * (19 * HZ))) : \ | ||
59 | __udelay((n) * (19 * HZ))) | ||
60 | |||
61 | #define ndelay(n) (__builtin_constant_p(n)? \ | ||
62 | ((n) > __MAX_NDELAY? __bad_ndelay(): __ndelay((n) * HZ)) : \ | ||
63 | __ndelay((n) * HZ)) | ||
64 | |||
65 | #endif /* defined(_PPC_DELAY_H) */ | ||
66 | #endif /* __KERNEL__ */ | ||