Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _ASM_M32R_ATOMIC_H |
| 2 | #define _ASM_M32R_ATOMIC_H |
| 3 | |
| 4 | /* |
| 5 | * linux/include/asm-m32r/atomic.h |
| 6 | * |
| 7 | * M32R version: |
| 8 | * Copyright (C) 2001, 2002 Hitoshi Yamamoto |
| 9 | * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org> |
| 10 | */ |
| 11 | |
Matthew Wilcox | ea435467 | 2009-01-06 14:40:39 -0800 | [diff] [blame] | 12 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <asm/assembler.h> |
David Howells | c9034c3 | 2012-03-28 18:30:02 +0100 | [diff] [blame] | 14 | #include <asm/cmpxchg.h> |
| 15 | #include <asm/dcache_clear.h> |
Peter Zijlstra | 89607d5 | 2014-03-13 19:00:36 +0100 | [diff] [blame] | 16 | #include <asm/barrier.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | /* |
| 19 | * Atomic operations that C can't guarantee us. Useful for |
| 20 | * resource counting etc.. |
| 21 | */ |
| 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #define ATOMIC_INIT(i) { (i) } |
| 24 | |
| 25 | /** |
| 26 | * atomic_read - read atomic variable |
| 27 | * @v: pointer of type atomic_t |
| 28 | * |
| 29 | * Atomically reads the value of @v. |
| 30 | */ |
Pranith Kumar | 2291059 | 2014-09-23 10:29:50 -0400 | [diff] [blame] | 31 | #define atomic_read(v) ACCESS_ONCE((v)->counter) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | /** |
| 34 | * atomic_set - set atomic variable |
| 35 | * @v: pointer of type atomic_t |
| 36 | * @i: required value |
| 37 | * |
| 38 | * Atomically sets the value of @v to @i. |
| 39 | */ |
| 40 | #define atomic_set(v,i) (((v)->counter) = (i)) |
| 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #ifdef CONFIG_CHIP_M32700_TS1 |
Peter Zijlstra | c9ebe21 | 2014-03-23 19:02:22 +0100 | [diff] [blame] | 43 | #define __ATOMIC_CLOBBER , "r4" |
| 44 | #else |
| 45 | #define __ATOMIC_CLOBBER |
| 46 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Peter Zijlstra | c9ebe21 | 2014-03-23 19:02:22 +0100 | [diff] [blame] | 48 | #define ATOMIC_OP(op) \ |
| 49 | static __inline__ void atomic_##op(int i, atomic_t *v) \ |
| 50 | { \ |
| 51 | unsigned long flags; \ |
| 52 | int result; \ |
| 53 | \ |
| 54 | local_irq_save(flags); \ |
| 55 | __asm__ __volatile__ ( \ |
| 56 | "# atomic_" #op " \n\t" \ |
| 57 | DCACHE_CLEAR("%0", "r4", "%1") \ |
| 58 | M32R_LOCK" %0, @%1; \n\t" \ |
| 59 | #op " %0, %2; \n\t" \ |
| 60 | M32R_UNLOCK" %0, @%1; \n\t" \ |
| 61 | : "=&r" (result) \ |
| 62 | : "r" (&v->counter), "r" (i) \ |
| 63 | : "memory" \ |
| 64 | __ATOMIC_CLOBBER \ |
| 65 | ); \ |
| 66 | local_irq_restore(flags); \ |
| 67 | } \ |
| 68 | |
| 69 | #define ATOMIC_OP_RETURN(op) \ |
| 70 | static __inline__ int atomic_##op##_return(int i, atomic_t *v) \ |
| 71 | { \ |
| 72 | unsigned long flags; \ |
| 73 | int result; \ |
| 74 | \ |
| 75 | local_irq_save(flags); \ |
| 76 | __asm__ __volatile__ ( \ |
| 77 | "# atomic_" #op "_return \n\t" \ |
| 78 | DCACHE_CLEAR("%0", "r4", "%1") \ |
| 79 | M32R_LOCK" %0, @%1; \n\t" \ |
| 80 | #op " %0, %2; \n\t" \ |
| 81 | M32R_UNLOCK" %0, @%1; \n\t" \ |
| 82 | : "=&r" (result) \ |
| 83 | : "r" (&v->counter), "r" (i) \ |
| 84 | : "memory" \ |
| 85 | __ATOMIC_CLOBBER \ |
| 86 | ); \ |
| 87 | local_irq_restore(flags); \ |
| 88 | \ |
| 89 | return result; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | } |
| 91 | |
Peter Zijlstra | c9ebe21 | 2014-03-23 19:02:22 +0100 | [diff] [blame] | 92 | #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Peter Zijlstra | c9ebe21 | 2014-03-23 19:02:22 +0100 | [diff] [blame] | 94 | ATOMIC_OPS(add) |
| 95 | ATOMIC_OPS(sub) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Peter Zijlstra | c66e45e | 2014-04-23 19:57:49 +0200 | [diff] [blame] | 97 | ATOMIC_OP(and) |
| 98 | ATOMIC_OP(or) |
| 99 | ATOMIC_OP(xor) |
| 100 | |
Peter Zijlstra | c9ebe21 | 2014-03-23 19:02:22 +0100 | [diff] [blame] | 101 | #undef ATOMIC_OPS |
| 102 | #undef ATOMIC_OP_RETURN |
| 103 | #undef ATOMIC_OP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
| 105 | /** |
| 106 | * atomic_sub_and_test - subtract value from variable and test result |
| 107 | * @i: integer value to subtract |
| 108 | * @v: pointer of type atomic_t |
| 109 | * |
| 110 | * Atomically subtracts @i from @v and returns |
| 111 | * true if the result is zero, or false for all |
| 112 | * other cases. |
| 113 | */ |
| 114 | #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) |
| 115 | |
| 116 | /** |
| 117 | * atomic_inc_return - increment atomic variable and return it |
| 118 | * @v: pointer of type atomic_t |
| 119 | * |
| 120 | * Atomically increments @v by 1 and returns the result. |
| 121 | */ |
| 122 | static __inline__ int atomic_inc_return(atomic_t *v) |
| 123 | { |
| 124 | unsigned long flags; |
| 125 | int result; |
| 126 | |
| 127 | local_irq_save(flags); |
| 128 | __asm__ __volatile__ ( |
| 129 | "# atomic_inc_return \n\t" |
| 130 | DCACHE_CLEAR("%0", "r4", "%1") |
| 131 | M32R_LOCK" %0, @%1; \n\t" |
| 132 | "addi %0, #1; \n\t" |
| 133 | M32R_UNLOCK" %0, @%1; \n\t" |
| 134 | : "=&r" (result) |
| 135 | : "r" (&v->counter) |
| 136 | : "memory" |
Peter Zijlstra | c9ebe21 | 2014-03-23 19:02:22 +0100 | [diff] [blame] | 137 | __ATOMIC_CLOBBER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | ); |
| 139 | local_irq_restore(flags); |
| 140 | |
| 141 | return result; |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * atomic_dec_return - decrement atomic variable and return it |
| 146 | * @v: pointer of type atomic_t |
| 147 | * |
| 148 | * Atomically decrements @v by 1 and returns the result. |
| 149 | */ |
| 150 | static __inline__ int atomic_dec_return(atomic_t *v) |
| 151 | { |
| 152 | unsigned long flags; |
| 153 | int result; |
| 154 | |
| 155 | local_irq_save(flags); |
| 156 | __asm__ __volatile__ ( |
| 157 | "# atomic_dec_return \n\t" |
| 158 | DCACHE_CLEAR("%0", "r4", "%1") |
| 159 | M32R_LOCK" %0, @%1; \n\t" |
| 160 | "addi %0, #-1; \n\t" |
| 161 | M32R_UNLOCK" %0, @%1; \n\t" |
| 162 | : "=&r" (result) |
| 163 | : "r" (&v->counter) |
| 164 | : "memory" |
Peter Zijlstra | c9ebe21 | 2014-03-23 19:02:22 +0100 | [diff] [blame] | 165 | __ATOMIC_CLOBBER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | ); |
| 167 | local_irq_restore(flags); |
| 168 | |
| 169 | return result; |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * atomic_inc - increment atomic variable |
| 174 | * @v: pointer of type atomic_t |
| 175 | * |
| 176 | * Atomically increments @v by 1. |
| 177 | */ |
| 178 | #define atomic_inc(v) ((void)atomic_inc_return(v)) |
| 179 | |
| 180 | /** |
| 181 | * atomic_dec - decrement atomic variable |
| 182 | * @v: pointer of type atomic_t |
| 183 | * |
| 184 | * Atomically decrements @v by 1. |
| 185 | */ |
| 186 | #define atomic_dec(v) ((void)atomic_dec_return(v)) |
| 187 | |
| 188 | /** |
| 189 | * atomic_inc_and_test - increment and test |
| 190 | * @v: pointer of type atomic_t |
| 191 | * |
| 192 | * Atomically increments @v by 1 |
| 193 | * and returns true if the result is zero, or false for all |
| 194 | * other cases. |
| 195 | */ |
| 196 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) |
| 197 | |
| 198 | /** |
| 199 | * atomic_dec_and_test - decrement and test |
| 200 | * @v: pointer of type atomic_t |
| 201 | * |
| 202 | * Atomically decrements @v by 1 and |
| 203 | * returns true if the result is 0, or false for all |
| 204 | * other cases. |
| 205 | */ |
| 206 | #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) |
| 207 | |
| 208 | /** |
| 209 | * atomic_add_negative - add and test if negative |
| 210 | * @v: pointer of type atomic_t |
| 211 | * @i: integer value to add |
| 212 | * |
| 213 | * Atomically adds @i to @v and returns true |
| 214 | * if the result is negative, or false when |
| 215 | * result is greater than or equal to zero. |
| 216 | */ |
| 217 | #define atomic_add_negative(i,v) (atomic_add_return((i), (v)) < 0) |
| 218 | |
Hirokazu Takata | 0332db5 | 2005-11-28 13:43:59 -0800 | [diff] [blame] | 219 | #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) |
Ingo Molnar | ffbf670 | 2006-01-09 15:59:17 -0800 | [diff] [blame] | 220 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
Hirokazu Takata | 0332db5 | 2005-11-28 13:43:59 -0800 | [diff] [blame] | 221 | |
| 222 | /** |
Arun Sharma | f24219b | 2011-07-26 16:09:07 -0700 | [diff] [blame] | 223 | * __atomic_add_unless - add unless the number is a given value |
Hirokazu Takata | 0332db5 | 2005-11-28 13:43:59 -0800 | [diff] [blame] | 224 | * @v: pointer of type atomic_t |
| 225 | * @a: the amount to add to v... |
| 226 | * @u: ...unless v is equal to u. |
| 227 | * |
| 228 | * Atomically adds @a to @v, so long as it was not @u. |
Arun Sharma | f24219b | 2011-07-26 16:09:07 -0700 | [diff] [blame] | 229 | * Returns the old value of @v. |
Hirokazu Takata | 0332db5 | 2005-11-28 13:43:59 -0800 | [diff] [blame] | 230 | */ |
Arun Sharma | f24219b | 2011-07-26 16:09:07 -0700 | [diff] [blame] | 231 | static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u) |
Mathieu Desnoyers | 2856f5e | 2007-05-08 00:34:38 -0700 | [diff] [blame] | 232 | { |
| 233 | int c, old; |
| 234 | c = atomic_read(v); |
| 235 | for (;;) { |
| 236 | if (unlikely(c == (u))) |
| 237 | break; |
| 238 | old = atomic_cmpxchg((v), c, c + (a)); |
| 239 | if (likely(old == c)) |
| 240 | break; |
| 241 | c = old; |
| 242 | } |
Arun Sharma | f24219b | 2011-07-26 16:09:07 -0700 | [diff] [blame] | 243 | return c; |
Mathieu Desnoyers | 2856f5e | 2007-05-08 00:34:38 -0700 | [diff] [blame] | 244 | } |
| 245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | #endif /* _ASM_M32R_ATOMIC_H */ |