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| author | Jonas Bonn <jonas@southpole.se> | 2011-07-02 10:29:24 +0200 |
|---|---|---|
| committer | Jonas Bonn <jonas@southpole.se> | 2011-07-07 20:11:39 +0200 |
| commit | 30ab2b034fa87472d700f584e277e3aeb7a84d2c (patch) | |
| tree | d503ed633bd4c739471d5c016d2e1c3eb4e063a4 /include/asm-generic/delay.h | |
| parent | Linux 3.0-rc5 (diff) | |
| download | linux-30ab2b034fa87472d700f584e277e3aeb7a84d2c.tar.xz linux-30ab2b034fa87472d700f584e277e3aeb7a84d2c.zip | |
asm-generic: adapt delay.h to common implementation
Several architectures are using a common delay.h implementation that
appears to have originated with the x86 architecture. This common
implementation is a bit fuller than the current asm-generic version
and has some compile-time checks that should be interesting for all
architectures.
This patch takes the common delay.h version and replaces the rather
trivial asm-generic version with it. As no architecture was actually
using asm-generic/delay.h, this change is rather innocuous; it will,
however, allow us to switch at least four architectures over to using
the asm-generic version.
Signed-off-by: Jonas Bonn <jonas@southpole.se>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'include/asm-generic/delay.h')
| -rw-r--r-- | include/asm-generic/delay.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/include/asm-generic/delay.h b/include/asm-generic/delay.h index 4586fec75ddb..6511b99c5f17 100644 --- a/include/asm-generic/delay.h +++ b/include/asm-generic/delay.h @@ -1,9 +1,23 @@ #ifndef __ASM_GENERIC_DELAY_H #define __ASM_GENERIC_DELAY_H +/* Undefined functions to get compile-time errors */ +extern void __bad_udelay(void); +extern void __bad_ndelay(void); + extern void __udelay(unsigned long usecs); +extern void __ndelay(unsigned long nsecs); +extern void __const_udelay(unsigned long xloops); extern void __delay(unsigned long loops); -#define udelay(n) __udelay(n) +/* 0x10c7 is 2**32 / 1000000 (rounded up) */ +#define udelay(n) (__builtin_constant_p(n) ? \ + ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \ + __udelay(n)) + +/* 0x5 is 2**32 / 1000000000 (rounded up) */ +#define ndelay(n) (__builtin_constant_p(n) ? \ + ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \ + __ndelay(n)) #endif /* __ASM_GENERIC_DELAY_H */ |