/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_SH_CMPXCHG_H
#define __ASM_SH_CMPXCHG_H

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc..
 */

#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/cmpxchg-emu.h>

#if defined(CONFIG_GUSA_RB)
#include <asm/cmpxchg-grb.h>
#elif defined(CONFIG_CPU_SH4A)
#include <asm/cmpxchg-llsc.h>
#elif defined(CONFIG_CPU_J2) && defined(CONFIG_SMP)
#include <asm/cmpxchg-cas.h>
#else
#include <asm/cmpxchg-irq.h>
#endif

extern void __xchg_called_with_bad_pointer(void);

#define __arch_xchg(ptr, x, size)                               \
({                                                      \
        unsigned long __xchg__res;                      \
        volatile void *__xchg_ptr = (ptr);              \
        switch (size) {                                 \
        case 4:                                         \
                __xchg__res = xchg_u32(__xchg_ptr, x);  \
                break;                                  \
        case 2:                                         \
                __xchg__res = xchg_u16(__xchg_ptr, x);  \
                break;                                  \
        case 1:                                         \
                __xchg__res = xchg_u8(__xchg_ptr, x);   \
                break;                                  \
        default:                                        \
                __xchg_called_with_bad_pointer();       \
                __xchg__res = x;                        \
                break;                                  \
        }                                               \
                                                        \
        __xchg__res;                                    \
})

#define arch_xchg(ptr,x)        \
        ((__typeof__(*(ptr)))__arch_xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))

/* This function doesn't exist, so you'll get a linker error
 * if something tries to do an invalid cmpxchg(). */
extern void __cmpxchg_called_with_bad_pointer(void);

static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
                unsigned long new, int size)
{
        switch (size) {
        case 1:
                return cmpxchg_emu_u8(ptr, old, new);
        case 4:
                return __cmpxchg_u32(ptr, old, new);
        }
        __cmpxchg_called_with_bad_pointer();
        return old;
}

#define arch_cmpxchg(ptr,o,n)                                            \
  ({                                                                     \
     __typeof__(*(ptr)) _o_ = (o);                                       \
     __typeof__(*(ptr)) _n_ = (n);                                       \
     (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,           \
                                    (unsigned long)_n_, sizeof(*(ptr))); \
  })

#include <asm-generic/cmpxchg-local.h>

#define arch_cmpxchg_local(ptr, o, n) ({                                \
        (__typeof__(*ptr))__generic_cmpxchg_local((ptr),                \
                                                  (unsigned long)(o),   \
                                                  (unsigned long)(n),   \
                                                  sizeof(*(ptr)));      \
})

#endif /* __ASM_SH_CMPXCHG_H */