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1da177e4 LT |
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 | ||
1da177e4 LT |
12 | #include <asm/assembler.h> |
13 | #include <asm/system.h> | |
14 | ||
15 | /* | |
16 | * Atomic operations that C can't guarantee us. Useful for | |
17 | * resource counting etc.. | |
18 | */ | |
19 | ||
20 | /* | |
21 | * Make sure gcc doesn't try to be clever and move things around | |
22 | * on us. We need to use _exactly_ the address the user gave us, | |
23 | * not some alias that contains the same information. | |
24 | */ | |
25 | typedef struct { volatile int counter; } atomic_t; | |
26 | ||
27 | #define ATOMIC_INIT(i) { (i) } | |
28 | ||
29 | /** | |
30 | * atomic_read - read atomic variable | |
31 | * @v: pointer of type atomic_t | |
32 | * | |
33 | * Atomically reads the value of @v. | |
34 | */ | |
35 | #define atomic_read(v) ((v)->counter) | |
36 | ||
37 | /** | |
38 | * atomic_set - set atomic variable | |
39 | * @v: pointer of type atomic_t | |
40 | * @i: required value | |
41 | * | |
42 | * Atomically sets the value of @v to @i. | |
43 | */ | |
44 | #define atomic_set(v,i) (((v)->counter) = (i)) | |
45 | ||
46 | /** | |
47 | * atomic_add_return - add integer to atomic variable and return it | |
48 | * @i: integer value to add | |
49 | * @v: pointer of type atomic_t | |
50 | * | |
51 | * Atomically adds @i to @v and return (@i + @v). | |
52 | */ | |
53 | static __inline__ int atomic_add_return(int i, atomic_t *v) | |
54 | { | |
55 | unsigned long flags; | |
56 | int result; | |
57 | ||
58 | local_irq_save(flags); | |
59 | __asm__ __volatile__ ( | |
60 | "# atomic_add_return \n\t" | |
61 | DCACHE_CLEAR("%0", "r4", "%1") | |
62 | M32R_LOCK" %0, @%1; \n\t" | |
63 | "add %0, %2; \n\t" | |
64 | M32R_UNLOCK" %0, @%1; \n\t" | |
65 | : "=&r" (result) | |
66 | : "r" (&v->counter), "r" (i) | |
67 | : "memory" | |
68 | #ifdef CONFIG_CHIP_M32700_TS1 | |
69 | , "r4" | |
70 | #endif /* CONFIG_CHIP_M32700_TS1 */ | |
71 | ); | |
72 | local_irq_restore(flags); | |
73 | ||
74 | return result; | |
75 | } | |
76 | ||
77 | /** | |
78 | * atomic_sub_return - subtract integer from atomic variable and return it | |
79 | * @i: integer value to subtract | |
80 | * @v: pointer of type atomic_t | |
81 | * | |
82 | * Atomically subtracts @i from @v and return (@v - @i). | |
83 | */ | |
84 | static __inline__ int atomic_sub_return(int i, atomic_t *v) | |
85 | { | |
86 | unsigned long flags; | |
87 | int result; | |
88 | ||
89 | local_irq_save(flags); | |
90 | __asm__ __volatile__ ( | |
91 | "# atomic_sub_return \n\t" | |
92 | DCACHE_CLEAR("%0", "r4", "%1") | |
93 | M32R_LOCK" %0, @%1; \n\t" | |
94 | "sub %0, %2; \n\t" | |
95 | M32R_UNLOCK" %0, @%1; \n\t" | |
96 | : "=&r" (result) | |
97 | : "r" (&v->counter), "r" (i) | |
98 | : "memory" | |
99 | #ifdef CONFIG_CHIP_M32700_TS1 | |
100 | , "r4" | |
101 | #endif /* CONFIG_CHIP_M32700_TS1 */ | |
102 | ); | |
103 | local_irq_restore(flags); | |
104 | ||
105 | return result; | |
106 | } | |
107 | ||
108 | /** | |
109 | * atomic_add - add integer to atomic variable | |
110 | * @i: integer value to add | |
111 | * @v: pointer of type atomic_t | |
112 | * | |
113 | * Atomically adds @i to @v. | |
114 | */ | |
115 | #define atomic_add(i,v) ((void) atomic_add_return((i), (v))) | |
116 | ||
117 | /** | |
118 | * atomic_sub - subtract the atomic variable | |
119 | * @i: integer value to subtract | |
120 | * @v: pointer of type atomic_t | |
121 | * | |
122 | * Atomically subtracts @i from @v. | |
123 | */ | |
124 | #define atomic_sub(i,v) ((void) atomic_sub_return((i), (v))) | |
125 | ||
126 | /** | |
127 | * atomic_sub_and_test - subtract value from variable and test result | |
128 | * @i: integer value to subtract | |
129 | * @v: pointer of type atomic_t | |
130 | * | |
131 | * Atomically subtracts @i from @v and returns | |
132 | * true if the result is zero, or false for all | |
133 | * other cases. | |
134 | */ | |
135 | #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) | |
136 | ||
137 | /** | |
138 | * atomic_inc_return - increment atomic variable and return it | |
139 | * @v: pointer of type atomic_t | |
140 | * | |
141 | * Atomically increments @v by 1 and returns the result. | |
142 | */ | |
143 | static __inline__ int atomic_inc_return(atomic_t *v) | |
144 | { | |
145 | unsigned long flags; | |
146 | int result; | |
147 | ||
148 | local_irq_save(flags); | |
149 | __asm__ __volatile__ ( | |
150 | "# atomic_inc_return \n\t" | |
151 | DCACHE_CLEAR("%0", "r4", "%1") | |
152 | M32R_LOCK" %0, @%1; \n\t" | |
153 | "addi %0, #1; \n\t" | |
154 | M32R_UNLOCK" %0, @%1; \n\t" | |
155 | : "=&r" (result) | |
156 | : "r" (&v->counter) | |
157 | : "memory" | |
158 | #ifdef CONFIG_CHIP_M32700_TS1 | |
159 | , "r4" | |
160 | #endif /* CONFIG_CHIP_M32700_TS1 */ | |
161 | ); | |
162 | local_irq_restore(flags); | |
163 | ||
164 | return result; | |
165 | } | |
166 | ||
167 | /** | |
168 | * atomic_dec_return - decrement atomic variable and return it | |
169 | * @v: pointer of type atomic_t | |
170 | * | |
171 | * Atomically decrements @v by 1 and returns the result. | |
172 | */ | |
173 | static __inline__ int atomic_dec_return(atomic_t *v) | |
174 | { | |
175 | unsigned long flags; | |
176 | int result; | |
177 | ||
178 | local_irq_save(flags); | |
179 | __asm__ __volatile__ ( | |
180 | "# atomic_dec_return \n\t" | |
181 | DCACHE_CLEAR("%0", "r4", "%1") | |
182 | M32R_LOCK" %0, @%1; \n\t" | |
183 | "addi %0, #-1; \n\t" | |
184 | M32R_UNLOCK" %0, @%1; \n\t" | |
185 | : "=&r" (result) | |
186 | : "r" (&v->counter) | |
187 | : "memory" | |
188 | #ifdef CONFIG_CHIP_M32700_TS1 | |
189 | , "r4" | |
190 | #endif /* CONFIG_CHIP_M32700_TS1 */ | |
191 | ); | |
192 | local_irq_restore(flags); | |
193 | ||
194 | return result; | |
195 | } | |
196 | ||
197 | /** | |
198 | * atomic_inc - increment atomic variable | |
199 | * @v: pointer of type atomic_t | |
200 | * | |
201 | * Atomically increments @v by 1. | |
202 | */ | |
203 | #define atomic_inc(v) ((void)atomic_inc_return(v)) | |
204 | ||
205 | /** | |
206 | * atomic_dec - decrement atomic variable | |
207 | * @v: pointer of type atomic_t | |
208 | * | |
209 | * Atomically decrements @v by 1. | |
210 | */ | |
211 | #define atomic_dec(v) ((void)atomic_dec_return(v)) | |
212 | ||
213 | /** | |
214 | * atomic_inc_and_test - increment and test | |
215 | * @v: pointer of type atomic_t | |
216 | * | |
217 | * Atomically increments @v by 1 | |
218 | * and returns true if the result is zero, or false for all | |
219 | * other cases. | |
220 | */ | |
221 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) | |
222 | ||
223 | /** | |
224 | * atomic_dec_and_test - decrement and test | |
225 | * @v: pointer of type atomic_t | |
226 | * | |
227 | * Atomically decrements @v by 1 and | |
228 | * returns true if the result is 0, or false for all | |
229 | * other cases. | |
230 | */ | |
231 | #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) | |
232 | ||
233 | /** | |
234 | * atomic_add_negative - add and test if negative | |
235 | * @v: pointer of type atomic_t | |
236 | * @i: integer value to add | |
237 | * | |
238 | * Atomically adds @i to @v and returns true | |
239 | * if the result is negative, or false when | |
240 | * result is greater than or equal to zero. | |
241 | */ | |
242 | #define atomic_add_negative(i,v) (atomic_add_return((i), (v)) < 0) | |
243 | ||
0332db5a | 244 | #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) |
ffbf670f | 245 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
0332db5a HT |
246 | |
247 | /** | |
248 | * atomic_add_unless - add unless the number is a given value | |
249 | * @v: pointer of type atomic_t | |
250 | * @a: the amount to add to v... | |
251 | * @u: ...unless v is equal to u. | |
252 | * | |
253 | * Atomically adds @a to @v, so long as it was not @u. | |
254 | * Returns non-zero if @v was not @u, and zero otherwise. | |
255 | */ | |
256 | #define atomic_add_unless(v, a, u) \ | |
257 | ({ \ | |
258 | int c, old; \ | |
259 | c = atomic_read(v); \ | |
260 | while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ | |
261 | c = old; \ | |
262 | c != (u); \ | |
263 | }) | |
264 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) | |
265 | ||
1da177e4 LT |
266 | static __inline__ void atomic_clear_mask(unsigned long mask, atomic_t *addr) |
267 | { | |
268 | unsigned long flags; | |
269 | unsigned long tmp; | |
270 | ||
271 | local_irq_save(flags); | |
272 | __asm__ __volatile__ ( | |
273 | "# atomic_clear_mask \n\t" | |
274 | DCACHE_CLEAR("%0", "r5", "%1") | |
275 | M32R_LOCK" %0, @%1; \n\t" | |
276 | "and %0, %2; \n\t" | |
277 | M32R_UNLOCK" %0, @%1; \n\t" | |
278 | : "=&r" (tmp) | |
279 | : "r" (addr), "r" (~mask) | |
280 | : "memory" | |
281 | #ifdef CONFIG_CHIP_M32700_TS1 | |
282 | , "r5" | |
283 | #endif /* CONFIG_CHIP_M32700_TS1 */ | |
284 | ); | |
285 | local_irq_restore(flags); | |
286 | } | |
287 | ||
288 | static __inline__ void atomic_set_mask(unsigned long mask, atomic_t *addr) | |
289 | { | |
290 | unsigned long flags; | |
291 | unsigned long tmp; | |
292 | ||
293 | local_irq_save(flags); | |
294 | __asm__ __volatile__ ( | |
295 | "# atomic_set_mask \n\t" | |
296 | DCACHE_CLEAR("%0", "r5", "%1") | |
297 | M32R_LOCK" %0, @%1; \n\t" | |
298 | "or %0, %2; \n\t" | |
299 | M32R_UNLOCK" %0, @%1; \n\t" | |
300 | : "=&r" (tmp) | |
301 | : "r" (addr), "r" (mask) | |
302 | : "memory" | |
303 | #ifdef CONFIG_CHIP_M32700_TS1 | |
304 | , "r5" | |
305 | #endif /* CONFIG_CHIP_M32700_TS1 */ | |
306 | ); | |
307 | local_irq_restore(flags); | |
308 | } | |
309 | ||
310 | /* Atomic operations are already serializing on m32r */ | |
311 | #define smp_mb__before_atomic_dec() barrier() | |
312 | #define smp_mb__after_atomic_dec() barrier() | |
313 | #define smp_mb__before_atomic_inc() barrier() | |
314 | #define smp_mb__after_atomic_inc() barrier() | |
315 | ||
d3cb4871 | 316 | #include <asm-generic/atomic.h> |
1da177e4 | 317 | #endif /* _ASM_M32R_ATOMIC_H */ |