David Howells | 3bed8d6 | 2012-03-12 23:36:56 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2004-2009 Analog Devices Inc. |
| 3 | * Tony Kou (tonyko@lineo.ca) |
| 4 | * |
| 5 | * Licensed under the GPL-2 or later |
| 6 | */ |
| 7 | |
| 8 | #ifndef _BLACKFIN_BARRIER_H |
| 9 | #define _BLACKFIN_BARRIER_H |
| 10 | |
| 11 | #include <asm/cache.h> |
| 12 | |
| 13 | #define nop() __asm__ __volatile__ ("nop;\n\t" : : ) |
| 14 | |
| 15 | /* |
| 16 | * Force strict CPU ordering. |
| 17 | */ |
| 18 | #ifdef CONFIG_SMP |
| 19 | |
| 20 | #ifdef __ARCH_SYNC_CORE_DCACHE |
| 21 | /* Force Core data cache coherence */ |
| 22 | # define mb() do { barrier(); smp_check_barrier(); smp_mark_barrier(); } while (0) |
| 23 | # define rmb() do { barrier(); smp_check_barrier(); } while (0) |
| 24 | # define wmb() do { barrier(); smp_mark_barrier(); } while (0) |
| 25 | # define read_barrier_depends() do { barrier(); smp_check_barrier(); } while (0) |
| 26 | #else |
| 27 | # define mb() barrier() |
| 28 | # define rmb() barrier() |
| 29 | # define wmb() barrier() |
| 30 | # define read_barrier_depends() do { } while (0) |
| 31 | #endif |
| 32 | |
| 33 | #else /* !CONFIG_SMP */ |
| 34 | |
| 35 | #define mb() barrier() |
| 36 | #define rmb() barrier() |
| 37 | #define wmb() barrier() |
| 38 | #define read_barrier_depends() do { } while (0) |
| 39 | |
| 40 | #endif /* !CONFIG_SMP */ |
| 41 | |
| 42 | #define smp_mb() mb() |
| 43 | #define smp_rmb() rmb() |
| 44 | #define smp_wmb() wmb() |
| 45 | #define set_mb(var, value) do { var = value; mb(); } while (0) |
| 46 | #define smp_read_barrier_depends() read_barrier_depends() |
| 47 | |
| 48 | #endif /* _BLACKFIN_BARRIER_H */ |