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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _ASM_M32R_ATOMIC_H |
3 | #define _ASM_M32R_ATOMIC_H | |
4 | ||
5 | /* | |
6 | * linux/include/asm-m32r/atomic.h | |
7 | * | |
8 | * M32R version: | |
9 | * Copyright (C) 2001, 2002 Hitoshi Yamamoto | |
10 | * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org> | |
11 | */ | |
12 | ||
ea435467 | 13 | #include <linux/types.h> |
1da177e4 | 14 | #include <asm/assembler.h> |
c9034c3a DH |
15 | #include <asm/cmpxchg.h> |
16 | #include <asm/dcache_clear.h> | |
89607d5e | 17 | #include <asm/barrier.h> |
1da177e4 LT |
18 | |
19 | /* | |
20 | * Atomic operations that C can't guarantee us. Useful for | |
21 | * resource counting etc.. | |
22 | */ | |
23 | ||
1da177e4 LT |
24 | #define ATOMIC_INIT(i) { (i) } |
25 | ||
26 | /** | |
27 | * atomic_read - read atomic variable | |
28 | * @v: pointer of type atomic_t | |
29 | * | |
30 | * Atomically reads the value of @v. | |
31 | */ | |
62e8a325 | 32 | #define atomic_read(v) READ_ONCE((v)->counter) |
1da177e4 LT |
33 | |
34 | /** | |
35 | * atomic_set - set atomic variable | |
36 | * @v: pointer of type atomic_t | |
37 | * @i: required value | |
38 | * | |
39 | * Atomically sets the value of @v to @i. | |
40 | */ | |
62e8a325 | 41 | #define atomic_set(v,i) WRITE_ONCE(((v)->counter), (i)) |
1da177e4 | 42 | |
1da177e4 | 43 | #ifdef CONFIG_CHIP_M32700_TS1 |
c9ebe21b PZ |
44 | #define __ATOMIC_CLOBBER , "r4" |
45 | #else | |
46 | #define __ATOMIC_CLOBBER | |
47 | #endif | |
48 | ||
49 | #define ATOMIC_OP(op) \ | |
50 | static __inline__ void atomic_##op(int i, atomic_t *v) \ | |
51 | { \ | |
52 | unsigned long flags; \ | |
53 | int result; \ | |
54 | \ | |
55 | local_irq_save(flags); \ | |
56 | __asm__ __volatile__ ( \ | |
57 | "# atomic_" #op " \n\t" \ | |
58 | DCACHE_CLEAR("%0", "r4", "%1") \ | |
59 | M32R_LOCK" %0, @%1; \n\t" \ | |
60 | #op " %0, %2; \n\t" \ | |
61 | M32R_UNLOCK" %0, @%1; \n\t" \ | |
62 | : "=&r" (result) \ | |
63 | : "r" (&v->counter), "r" (i) \ | |
64 | : "memory" \ | |
65 | __ATOMIC_CLOBBER \ | |
66 | ); \ | |
67 | local_irq_restore(flags); \ | |
68 | } \ | |
69 | ||
70 | #define ATOMIC_OP_RETURN(op) \ | |
71 | static __inline__ int atomic_##op##_return(int i, atomic_t *v) \ | |
72 | { \ | |
73 | unsigned long flags; \ | |
74 | int result; \ | |
75 | \ | |
76 | local_irq_save(flags); \ | |
77 | __asm__ __volatile__ ( \ | |
78 | "# atomic_" #op "_return \n\t" \ | |
79 | DCACHE_CLEAR("%0", "r4", "%1") \ | |
80 | M32R_LOCK" %0, @%1; \n\t" \ | |
81 | #op " %0, %2; \n\t" \ | |
82 | M32R_UNLOCK" %0, @%1; \n\t" \ | |
83 | : "=&r" (result) \ | |
84 | : "r" (&v->counter), "r" (i) \ | |
85 | : "memory" \ | |
86 | __ATOMIC_CLOBBER \ | |
87 | ); \ | |
88 | local_irq_restore(flags); \ | |
89 | \ | |
90 | return result; \ | |
1da177e4 LT |
91 | } |
92 | ||
f6493705 PZ |
93 | #define ATOMIC_FETCH_OP(op) \ |
94 | static __inline__ int atomic_fetch_##op(int i, atomic_t *v) \ | |
95 | { \ | |
96 | unsigned long flags; \ | |
97 | int result, val; \ | |
98 | \ | |
99 | local_irq_save(flags); \ | |
100 | __asm__ __volatile__ ( \ | |
101 | "# atomic_fetch_" #op " \n\t" \ | |
102 | DCACHE_CLEAR("%0", "r4", "%2") \ | |
103 | M32R_LOCK" %1, @%2; \n\t" \ | |
104 | "mv %0, %1 \n\t" \ | |
105 | #op " %1, %3; \n\t" \ | |
106 | M32R_UNLOCK" %1, @%2; \n\t" \ | |
107 | : "=&r" (result), "=&r" (val) \ | |
108 | : "r" (&v->counter), "r" (i) \ | |
109 | : "memory" \ | |
110 | __ATOMIC_CLOBBER \ | |
111 | ); \ | |
112 | local_irq_restore(flags); \ | |
113 | \ | |
114 | return result; \ | |
115 | } | |
116 | ||
117 | #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op) | |
1da177e4 | 118 | |
c9ebe21b PZ |
119 | ATOMIC_OPS(add) |
120 | ATOMIC_OPS(sub) | |
1da177e4 | 121 | |
f6493705 PZ |
122 | #undef ATOMIC_OPS |
123 | #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op) | |
124 | ||
f6493705 PZ |
125 | ATOMIC_OPS(and) |
126 | ATOMIC_OPS(or) | |
127 | ATOMIC_OPS(xor) | |
c66e45ed | 128 | |
c9ebe21b | 129 | #undef ATOMIC_OPS |
f6493705 | 130 | #undef ATOMIC_FETCH_OP |
c9ebe21b PZ |
131 | #undef ATOMIC_OP_RETURN |
132 | #undef ATOMIC_OP | |
1da177e4 LT |
133 | |
134 | /** | |
135 | * atomic_sub_and_test - subtract value from variable and test result | |
136 | * @i: integer value to subtract | |
137 | * @v: pointer of type atomic_t | |
138 | * | |
139 | * Atomically subtracts @i from @v and returns | |
140 | * true if the result is zero, or false for all | |
141 | * other cases. | |
142 | */ | |
143 | #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) | |
144 | ||
145 | /** | |
146 | * atomic_inc_return - increment atomic variable and return it | |
147 | * @v: pointer of type atomic_t | |
148 | * | |
149 | * Atomically increments @v by 1 and returns the result. | |
150 | */ | |
151 | static __inline__ int atomic_inc_return(atomic_t *v) | |
152 | { | |
153 | unsigned long flags; | |
154 | int result; | |
155 | ||
156 | local_irq_save(flags); | |
157 | __asm__ __volatile__ ( | |
158 | "# atomic_inc_return \n\t" | |
159 | DCACHE_CLEAR("%0", "r4", "%1") | |
160 | M32R_LOCK" %0, @%1; \n\t" | |
161 | "addi %0, #1; \n\t" | |
162 | M32R_UNLOCK" %0, @%1; \n\t" | |
163 | : "=&r" (result) | |
164 | : "r" (&v->counter) | |
165 | : "memory" | |
c9ebe21b | 166 | __ATOMIC_CLOBBER |
1da177e4 LT |
167 | ); |
168 | local_irq_restore(flags); | |
169 | ||
170 | return result; | |
171 | } | |
172 | ||
173 | /** | |
174 | * atomic_dec_return - decrement atomic variable and return it | |
175 | * @v: pointer of type atomic_t | |
176 | * | |
177 | * Atomically decrements @v by 1 and returns the result. | |
178 | */ | |
179 | static __inline__ int atomic_dec_return(atomic_t *v) | |
180 | { | |
181 | unsigned long flags; | |
182 | int result; | |
183 | ||
184 | local_irq_save(flags); | |
185 | __asm__ __volatile__ ( | |
186 | "# atomic_dec_return \n\t" | |
187 | DCACHE_CLEAR("%0", "r4", "%1") | |
188 | M32R_LOCK" %0, @%1; \n\t" | |
189 | "addi %0, #-1; \n\t" | |
190 | M32R_UNLOCK" %0, @%1; \n\t" | |
191 | : "=&r" (result) | |
192 | : "r" (&v->counter) | |
193 | : "memory" | |
c9ebe21b | 194 | __ATOMIC_CLOBBER |
1da177e4 LT |
195 | ); |
196 | local_irq_restore(flags); | |
197 | ||
198 | return result; | |
199 | } | |
200 | ||
201 | /** | |
202 | * atomic_inc - increment atomic variable | |
203 | * @v: pointer of type atomic_t | |
204 | * | |
205 | * Atomically increments @v by 1. | |
206 | */ | |
207 | #define atomic_inc(v) ((void)atomic_inc_return(v)) | |
208 | ||
209 | /** | |
210 | * atomic_dec - decrement atomic variable | |
211 | * @v: pointer of type atomic_t | |
212 | * | |
213 | * Atomically decrements @v by 1. | |
214 | */ | |
215 | #define atomic_dec(v) ((void)atomic_dec_return(v)) | |
216 | ||
217 | /** | |
218 | * atomic_inc_and_test - increment and test | |
219 | * @v: pointer of type atomic_t | |
220 | * | |
221 | * Atomically increments @v by 1 | |
222 | * and returns true if the result is zero, or false for all | |
223 | * other cases. | |
224 | */ | |
225 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) | |
226 | ||
227 | /** | |
228 | * atomic_dec_and_test - decrement and test | |
229 | * @v: pointer of type atomic_t | |
230 | * | |
231 | * Atomically decrements @v by 1 and | |
232 | * returns true if the result is 0, or false for all | |
233 | * other cases. | |
234 | */ | |
235 | #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) | |
236 | ||
237 | /** | |
238 | * atomic_add_negative - add and test if negative | |
239 | * @v: pointer of type atomic_t | |
240 | * @i: integer value to add | |
241 | * | |
242 | * Atomically adds @i to @v and returns true | |
243 | * if the result is negative, or false when | |
244 | * result is greater than or equal to zero. | |
245 | */ | |
246 | #define atomic_add_negative(i,v) (atomic_add_return((i), (v)) < 0) | |
247 | ||
0332db5a | 248 | #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) |
ffbf670f | 249 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
0332db5a HT |
250 | |
251 | /** | |
f24219b4 | 252 | * __atomic_add_unless - add unless the number is a given value |
0332db5a HT |
253 | * @v: pointer of type atomic_t |
254 | * @a: the amount to add to v... | |
255 | * @u: ...unless v is equal to u. | |
256 | * | |
257 | * Atomically adds @a to @v, so long as it was not @u. | |
f24219b4 | 258 | * Returns the old value of @v. |
0332db5a | 259 | */ |
f24219b4 | 260 | static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u) |
2856f5e3 MD |
261 | { |
262 | int c, old; | |
263 | c = atomic_read(v); | |
264 | for (;;) { | |
265 | if (unlikely(c == (u))) | |
266 | break; | |
267 | old = atomic_cmpxchg((v), c, c + (a)); | |
268 | if (likely(old == c)) | |
269 | break; | |
270 | c = old; | |
271 | } | |
f24219b4 | 272 | return c; |
2856f5e3 MD |
273 | } |
274 | ||
1da177e4 | 275 | #endif /* _ASM_M32R_ATOMIC_H */ |