16a846f3f821a252762897751fa0aeb68dda635f5David Howells/* 26a846f3f821a252762897751fa0aeb68dda635f5David Howells * Port on Texas Instruments TMS320C6x architecture 36a846f3f821a252762897751fa0aeb68dda635f5David Howells * 46a846f3f821a252762897751fa0aeb68dda635f5David Howells * Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated 56a846f3f821a252762897751fa0aeb68dda635f5David Howells * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com) 66a846f3f821a252762897751fa0aeb68dda635f5David Howells * 76a846f3f821a252762897751fa0aeb68dda635f5David Howells * This program is free software; you can redistribute it and/or modify 86a846f3f821a252762897751fa0aeb68dda635f5David Howells * it under the terms of the GNU General Public License version 2 as 96a846f3f821a252762897751fa0aeb68dda635f5David Howells * published by the Free Software Foundation. 106a846f3f821a252762897751fa0aeb68dda635f5David Howells */ 116a846f3f821a252762897751fa0aeb68dda635f5David Howells#ifndef _ASM_C6X_CMPXCHG_H 126a846f3f821a252762897751fa0aeb68dda635f5David Howells#define _ASM_C6X_CMPXCHG_H 136a846f3f821a252762897751fa0aeb68dda635f5David Howells 146a846f3f821a252762897751fa0aeb68dda635f5David Howells#include <linux/irqflags.h> 156a846f3f821a252762897751fa0aeb68dda635f5David Howells 166a846f3f821a252762897751fa0aeb68dda635f5David Howells/* 176a846f3f821a252762897751fa0aeb68dda635f5David Howells * Misc. functions 186a846f3f821a252762897751fa0aeb68dda635f5David Howells */ 196a846f3f821a252762897751fa0aeb68dda635f5David Howellsstatic inline unsigned int __xchg(unsigned int x, volatile void *ptr, int size) 206a846f3f821a252762897751fa0aeb68dda635f5David Howells{ 216a846f3f821a252762897751fa0aeb68dda635f5David Howells unsigned int tmp; 226a846f3f821a252762897751fa0aeb68dda635f5David Howells unsigned long flags; 236a846f3f821a252762897751fa0aeb68dda635f5David Howells 246a846f3f821a252762897751fa0aeb68dda635f5David Howells local_irq_save(flags); 256a846f3f821a252762897751fa0aeb68dda635f5David Howells 266a846f3f821a252762897751fa0aeb68dda635f5David Howells switch (size) { 276a846f3f821a252762897751fa0aeb68dda635f5David Howells case 1: 286a846f3f821a252762897751fa0aeb68dda635f5David Howells tmp = 0; 296a846f3f821a252762897751fa0aeb68dda635f5David Howells tmp = *((unsigned char *) ptr); 306a846f3f821a252762897751fa0aeb68dda635f5David Howells *((unsigned char *) ptr) = (unsigned char) x; 316a846f3f821a252762897751fa0aeb68dda635f5David Howells break; 326a846f3f821a252762897751fa0aeb68dda635f5David Howells case 2: 336a846f3f821a252762897751fa0aeb68dda635f5David Howells tmp = 0; 346a846f3f821a252762897751fa0aeb68dda635f5David Howells tmp = *((unsigned short *) ptr); 356a846f3f821a252762897751fa0aeb68dda635f5David Howells *((unsigned short *) ptr) = x; 366a846f3f821a252762897751fa0aeb68dda635f5David Howells break; 376a846f3f821a252762897751fa0aeb68dda635f5David Howells case 4: 386a846f3f821a252762897751fa0aeb68dda635f5David Howells tmp = 0; 396a846f3f821a252762897751fa0aeb68dda635f5David Howells tmp = *((unsigned int *) ptr); 406a846f3f821a252762897751fa0aeb68dda635f5David Howells *((unsigned int *) ptr) = x; 416a846f3f821a252762897751fa0aeb68dda635f5David Howells break; 426a846f3f821a252762897751fa0aeb68dda635f5David Howells } 436a846f3f821a252762897751fa0aeb68dda635f5David Howells local_irq_restore(flags); 446a846f3f821a252762897751fa0aeb68dda635f5David Howells return tmp; 456a846f3f821a252762897751fa0aeb68dda635f5David Howells} 466a846f3f821a252762897751fa0aeb68dda635f5David Howells 476a846f3f821a252762897751fa0aeb68dda635f5David Howells#define xchg(ptr, x) \ 486a846f3f821a252762897751fa0aeb68dda635f5David Howells ((__typeof__(*(ptr)))__xchg((unsigned int)(x), (void *) (ptr), \ 496a846f3f821a252762897751fa0aeb68dda635f5David Howells sizeof(*(ptr)))) 506a846f3f821a252762897751fa0aeb68dda635f5David Howells#define tas(ptr) xchg((ptr), 1) 516a846f3f821a252762897751fa0aeb68dda635f5David Howells 526a846f3f821a252762897751fa0aeb68dda635f5David Howells 536a846f3f821a252762897751fa0aeb68dda635f5David Howells#include <asm-generic/cmpxchg-local.h> 546a846f3f821a252762897751fa0aeb68dda635f5David Howells 556a846f3f821a252762897751fa0aeb68dda635f5David Howells/* 566a846f3f821a252762897751fa0aeb68dda635f5David Howells * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make 576a846f3f821a252762897751fa0aeb68dda635f5David Howells * them available. 586a846f3f821a252762897751fa0aeb68dda635f5David Howells */ 596a846f3f821a252762897751fa0aeb68dda635f5David Howells#define cmpxchg_local(ptr, o, n) \ 606a846f3f821a252762897751fa0aeb68dda635f5David Howells ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), \ 616a846f3f821a252762897751fa0aeb68dda635f5David Howells (unsigned long)(o), \ 626a846f3f821a252762897751fa0aeb68dda635f5David Howells (unsigned long)(n), \ 636a846f3f821a252762897751fa0aeb68dda635f5David Howells sizeof(*(ptr)))) 646a846f3f821a252762897751fa0aeb68dda635f5David Howells#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) 656a846f3f821a252762897751fa0aeb68dda635f5David Howells 666a846f3f821a252762897751fa0aeb68dda635f5David Howells#include <asm-generic/cmpxchg.h> 676a846f3f821a252762897751fa0aeb68dda635f5David Howells 686a846f3f821a252762897751fa0aeb68dda635f5David Howells#endif /* _ASM_C6X_CMPXCHG_H */ 69