11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef __ASM_SH_ATOMIC_H 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define __ASM_SH_ATOMIC_H 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Atomic operations that C can't guarantee us. Useful for 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * resource counting etc.. 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10ea435467500612636f8f4fb639ff6e76b2496e4bMatthew Wilcox#include <linux/compiler.h> 11ea435467500612636f8f4fb639ff6e76b2496e4bMatthew Wilcox#include <linux/types.h> 12e839ca528718e68cad32a307dc9aabf01ef3eb05David Howells#include <asm/cmpxchg.h> 13603228bcb8da90f8f8a5cdd8de74178f6c3e7e13Peter Zijlstra#include <asm/barrier.h> 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 15ec2ccd884ab1e190bc5ddb210c7d5f5ea2ddeba3Nobuhiro Iwamatsu#define ATOMIC_INIT(i) { (i) } 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 172291059c852706c6f5ffb400366042b7625066cdPranith Kumar#define atomic_read(v) ACCESS_ONCE((v)->counter) 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic_set(v,i) ((v)->counter = (i)) 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 201efe4ce3ca126da77e450d5a83f7201949d76f62Stuart Menefy#if defined(CONFIG_GUSA_RB) 211efe4ce3ca126da77e450d5a83f7201949d76f62Stuart Menefy#include <asm/atomic-grb.h> 221efe4ce3ca126da77e450d5a83f7201949d76f62Stuart Menefy#elif defined(CONFIG_CPU_SH4A) 23ec723fbe7e19f5a66cea183bca7ca20675631a7aPaul Mundt#include <asm/atomic-llsc.h> 24781125ca58dfbd47635cfc0e408f1f9d7e10b227Paul Mundt#else 25ec723fbe7e19f5a66cea183bca7ca20675631a7aPaul Mundt#include <asm/atomic-irq.h> 26781125ca58dfbd47635cfc0e408f1f9d7e10b227Paul Mundt#endif 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) 298c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt#define atomic_dec_return(v) atomic_sub_return(1, (v)) 308c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt#define atomic_inc_return(v) atomic_add_return(1, (v)) 318c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) 328c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) 338c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 358c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt#define atomic_inc(v) atomic_add(1, (v)) 368c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt#define atomic_dec(v) atomic_sub(1, (v)) 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 388c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) 398c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) 408c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt 418c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt/** 42f24219b4e90cf70ec4a211b17fbabc725a0ddf3cArun Sharma * __atomic_add_unless - add unless the number is a given value 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @v: pointer of type atomic_t 448c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt * @a: the amount to add to v... 458c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt * @u: ...unless v is equal to u. 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 478c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt * Atomically adds @a to @v, so long as it was not @u. 48f24219b4e90cf70ec4a211b17fbabc725a0ddf3cArun Sharma * Returns the old value of @v. 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 50f24219b4e90cf70ec4a211b17fbabc725a0ddf3cArun Sharmastatic inline int __atomic_add_unless(atomic_t *v, int a, int u) 518426e1f6af0fd7f44d040af7263750c5a52f3cc3Nick Piggin{ 528c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt int c, old; 538c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt c = atomic_read(v); 548c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt for (;;) { 558c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt if (unlikely(c == (u))) 568c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt break; 578c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt old = atomic_cmpxchg((v), c, c + (a)); 588c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt if (likely(old == c)) 598c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt break; 608c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt c = old; 618c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt } 628c0b8139c87cfe8b95c6e763b4ca3190aa9b1ad0Paul Mundt 63f24219b4e90cf70ec4a211b17fbabc725a0ddf3cArun Sharma return c; 648426e1f6af0fd7f44d040af7263750c5a52f3cc3Nick Piggin} 658426e1f6af0fd7f44d040af7263750c5a52f3cc3Nick Piggin 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif /* __ASM_SH_ATOMIC_H */ 67