1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef __ASM_CSKY_ATOMIC_H 4 #define __ASM_CSKY_ATOMIC_H 5 6 #ifdef CONFIG_SMP 7 #include <asm-generic/atomic64.h> 8 9 #include <asm/cmpxchg.h> 10 #include <asm/barrier.h> 11 12 #define __atomic_acquire_fence() __bar_brarw() 13 14 #define __atomic_release_fence() __bar_brwaw() 15 16 static __always_inline int arch_atomic_read(const atomic_t *v) 17 { 18 return READ_ONCE(v->counter); 19 } 20 static __always_inline void arch_atomic_set(atomic_t *v, int i) 21 { 22 WRITE_ONCE(v->counter, i); 23 } 24 25 #define ATOMIC_OP(op) \ 26 static __always_inline \ 27 void arch_atomic_##op(int i, atomic_t *v) \ 28 { \ 29 unsigned long tmp; \ 30 __asm__ __volatile__ ( \ 31 "1: ldex.w %0, (%2) \n" \ 32 " " #op " %0, %1 \n" \ 33 " stex.w %0, (%2) \n" \ 34 " bez %0, 1b \n" \ 35 : "=&r" (tmp) \ 36 : "r" (i), "r" (&v->counter) \ 37 : "memory"); \ 38 } 39 40 ATOMIC_OP(add) 41 ATOMIC_OP(sub) 42 ATOMIC_OP(and) 43 ATOMIC_OP( or) 44 ATOMIC_OP(xor) 45 46 #undef ATOMIC_OP 47 48 #define ATOMIC_FETCH_OP(op) \ 49 static __always_inline \ 50 int arch_atomic_fetch_##op##_relaxed(int i, atomic_t *v) \ 51 { \ 52 register int ret, tmp; \ 53 __asm__ __volatile__ ( \ 54 "1: ldex.w %0, (%3) \n" \ 55 " mov %1, %0 \n" \ 56 " " #op " %0, %2 \n" \ 57 " stex.w %0, (%3) \n" \ 58 " bez %0, 1b \n" \ 59 : "=&r" (tmp), "=&r" (ret) \ 60 : "r" (i), "r"(&v->counter) \ 61 : "memory"); \ 62 return ret; \ 63 } 64 65 #define ATOMIC_OP_RETURN(op, c_op) \ 66 static __always_inline \ 67 int arch_atomic_##op##_return_relaxed(int i, atomic_t *v) \ 68 { \ 69 return arch_atomic_fetch_##op##_relaxed(i, v) c_op i; \ 70 } 71 72 #define ATOMIC_OPS(op, c_op) \ 73 ATOMIC_FETCH_OP(op) \ 74 ATOMIC_OP_RETURN(op, c_op) 75 76 ATOMIC_OPS(add, +) 77 ATOMIC_OPS(sub, -) 78 79 #define arch_atomic_fetch_add_relaxed arch_atomic_fetch_add_relaxed 80 #define arch_atomic_fetch_sub_relaxed arch_atomic_fetch_sub_relaxed 81 82 #define arch_atomic_add_return_relaxed arch_atomic_add_return_relaxed 83 #define arch_atomic_sub_return_relaxed arch_atomic_sub_return_relaxed 84 85 #undef ATOMIC_OPS 86 #undef ATOMIC_OP_RETURN 87 88 #define ATOMIC_OPS(op) \ 89 ATOMIC_FETCH_OP(op) 90 91 ATOMIC_OPS(and) 92 ATOMIC_OPS( or) 93 ATOMIC_OPS(xor) 94 95 #define arch_atomic_fetch_and_relaxed arch_atomic_fetch_and_relaxed 96 #define arch_atomic_fetch_or_relaxed arch_atomic_fetch_or_relaxed 97 #define arch_atomic_fetch_xor_relaxed arch_atomic_fetch_xor_relaxed 98 99 #undef ATOMIC_OPS 100 101 #undef ATOMIC_FETCH_OP 102 103 static __always_inline int 104 arch_atomic_fetch_add_unless(atomic_t *v, int a, int u) 105 { 106 int prev, tmp; 107 108 __asm__ __volatile__ ( 109 RELEASE_FENCE 110 "1: ldex.w %0, (%3) \n" 111 " cmpne %0, %4 \n" 112 " bf 2f \n" 113 " mov %1, %0 \n" 114 " add %1, %2 \n" 115 " stex.w %1, (%3) \n" 116 " bez %1, 1b \n" 117 FULL_FENCE 118 "2:\n" 119 : "=&r" (prev), "=&r" (tmp) 120 : "r" (a), "r" (&v->counter), "r" (u) 121 : "memory"); 122 123 return prev; 124 } 125 #define arch_atomic_fetch_add_unless arch_atomic_fetch_add_unless 126 127 static __always_inline bool 128 arch_atomic_inc_unless_negative(atomic_t *v) 129 { 130 int rc, tmp; 131 132 __asm__ __volatile__ ( 133 RELEASE_FENCE 134 "1: ldex.w %0, (%2) \n" 135 " movi %1, 0 \n" 136 " blz %0, 2f \n" 137 " movi %1, 1 \n" 138 " addi %0, 1 \n" 139 " stex.w %0, (%2) \n" 140 " bez %0, 1b \n" 141 FULL_FENCE 142 "2:\n" 143 : "=&r" (tmp), "=&r" (rc) 144 : "r" (&v->counter) 145 : "memory"); 146 147 return tmp ? true : false; 148 149 } 150 #define arch_atomic_inc_unless_negative arch_atomic_inc_unless_negative 151 152 static __always_inline bool 153 arch_atomic_dec_unless_positive(atomic_t *v) 154 { 155 int rc, tmp; 156 157 __asm__ __volatile__ ( 158 RELEASE_FENCE 159 "1: ldex.w %0, (%2) \n" 160 " movi %1, 0 \n" 161 " bhz %0, 2f \n" 162 " movi %1, 1 \n" 163 " subi %0, 1 \n" 164 " stex.w %0, (%2) \n" 165 " bez %0, 1b \n" 166 FULL_FENCE 167 "2:\n" 168 : "=&r" (tmp), "=&r" (rc) 169 : "r" (&v->counter) 170 : "memory"); 171 172 return tmp ? true : false; 173 } 174 #define arch_atomic_dec_unless_positive arch_atomic_dec_unless_positive 175 176 static __always_inline int 177 arch_atomic_dec_if_positive(atomic_t *v) 178 { 179 int dec, tmp; 180 181 __asm__ __volatile__ ( 182 RELEASE_FENCE 183 "1: ldex.w %0, (%2) \n" 184 " subi %1, %0, 1 \n" 185 " blz %1, 2f \n" 186 " stex.w %1, (%2) \n" 187 " bez %1, 1b \n" 188 FULL_FENCE 189 "2:\n" 190 : "=&r" (dec), "=&r" (tmp) 191 : "r" (&v->counter) 192 : "memory"); 193 194 return dec - 1; 195 } 196 #define arch_atomic_dec_if_positive arch_atomic_dec_if_positive 197 198 #else 199 #include <asm-generic/atomic.h> 200 #endif 201 202 #endif /* __ASM_CSKY_ATOMIC_H */ 203