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/*
* include/asm-xtensa/atomic.h
*
* Atomic operations that C can't guarantee us. Useful for resource counting..
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2001 - 2008 Tensilica Inc.
*/
#ifndef _XTENSA_ATOMIC_H
#define _XTENSA_ATOMIC_H
#include <linux/stringify.h>
#include <linux/types.h>
#ifdef __KERNEL__
#include <asm/processor.h>
#include <asm/cmpxchg.h>
#include <asm/barrier.h>
#define ATOMIC_INIT(i) { (i) }
/*
* This Xtensa implementation assumes that the right mechanism
* for exclusion is for locking interrupts to level EXCM_LEVEL.
*
* Locking interrupts looks like this:
*
* rsil a15, TOPLEVEL
* <code>
* wsr a15, PS
* rsync
*
* Note that a15 is used here because the register allocation
* done by the compiler is not guaranteed and a window overflow
* may not occur between the rsil and wsr instructions. By using
* a15 in the rsil, the machine is guaranteed to be in a state
* where no register reference will cause an overflow.
*/
/**
* atomic_read - read atomic variable
* @v: pointer of type atomic_t
*
* Atomically reads the value of @v.
*/
#define atomic_read(v) READ_ONCE((v)->counter)
/**
* atomic_set - set atomic variable
* @v: pointer of type atomic_t
* @i: required value
*
* Atomically sets the value of @v to @i.
*/
#define atomic_set(v,i) WRITE_ONCE((v)->counter, (i))
#if XCHAL_HAVE_S32C1I
#define ATOMIC_OP(op) \
static inline void atomic_##op(int i, atomic_t * v) \
{ \
unsigned long tmp; \
int result; \
\
__asm__ __volatile__( \
"1: l32i %1, %3, 0\n" \
" wsr %1, scompare1\n" \
" " #op " %0, %1, %2\n" \
" s32c1i %0, %3, 0\n" \
" bne %0, %1, 1b\n" \
: "=&a" (result), "=&a" (tmp) \
: "a" (i), "a" (v) \
: "memory" \
); \
} \
#define ATOMIC_OP_RETURN(op) \
static inline int atomic_##op##_return(int i, atomic_t * v) \
{ \
unsigned long tmp; \
int result; \
\
__asm__ __volatile__( \
"1: l32i %1, %3, 0\n" \
" wsr %1, scompare1\n" \
" " #op " %0, %1, %2\n" \
" s32c1i %0, %3, 0\n" \
" bne %0, %1, 1b\n" \
" " #op " %0, %0, %2\n" \
: "=&a" (result), "=&a" (tmp) \
: "a" (i), "a" (v) \
: "memory" \
); \
\
return result; \
}
#define ATOMIC_FETCH_OP(op) \
static inline int atomic_fetch_##op(int i, atomic_t * v) \
{ \
unsigned long tmp; \
int result; \
\
__asm__ __volatile__( \
"1: l32i %1, %3, 0\n" \
" wsr %1, scompare1\n" \
" " #op " %0, %1, %2\n" \
" s32c1i %0, %3, 0\n" \
" bne %0, %1, 1b\n" \
: "=&a" (result), "=&a" (tmp) \
: "a" (i), "a" (v) \
: "memory" \
); \
\
return result; \
}
#else /* XCHAL_HAVE_S32C1I */
#define ATOMIC_OP(op) \
static inline void atomic_##op(int i, atomic_t * v) \
{ \
unsigned int vval; \
\
__asm__ __volatile__( \
" rsil a15, "__stringify(TOPLEVEL)"\n"\
" l32i %0, %2, 0\n" \
" " #op " %0, %0, %1\n" \
" s32i %0, %2, 0\n" \
" wsr a15, ps\n" \
" rsync\n" \
: "=&a" (vval) \
: "a" (i), "a" (v) \
: "a15", "memory" \
); \
} \
#define ATOMIC_OP_RETURN(op) \
static inline int atomic_##op##_return(int i, atomic_t * v) \
{ \
unsigned int vval; \
\
__asm__ __volatile__( \
" rsil a15,"__stringify(TOPLEVEL)"\n" \
" l32i %0, %2, 0\n" \
" " #op " %0, %0, %1\n" \
" s32i %0, %2, 0\n" \
" wsr a15, ps\n" \
" rsync\n" \
: "=&a" (vval) \
: "a" (i), "a" (v) \
: "a15", "memory" \
); \
\
return vval; \
}
#define ATOMIC_FETCH_OP(op) \
static inline int atomic_fetch_##op(int i, atomic_t * v) \
{ \
unsigned int tmp, vval; \
\
__asm__ __volatile__( \
" rsil a15,"__stringify(TOPLEVEL)"\n" \
" l32i %0, %3, 0\n" \
" " #op " %1, %0, %2\n" \
" s32i %1, %3, 0\n" \
" wsr a15, ps\n" \
" rsync\n" \
: "=&a" (vval), "=&a" (tmp) \
: "a" (i), "a" (v) \
: "a15", "memory" \
); \
\
return vval; \
}
#endif /* XCHAL_HAVE_S32C1I */
#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op) ATOMIC_OP_RETURN(op)
ATOMIC_OPS(add)
ATOMIC_OPS(sub)
#undef ATOMIC_OPS
#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op)
ATOMIC_OPS(and)
ATOMIC_OPS(or)
ATOMIC_OPS(xor)
#undef ATOMIC_OPS
#undef ATOMIC_FETCH_OP
#undef ATOMIC_OP_RETURN
#undef ATOMIC_OP
#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
#endif /* __KERNEL__ */
#endif /* _XTENSA_ATOMIC_H */
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