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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
12#include <linux/types.h>
13#include <asm/assembler.h>
14#include <asm/system.h>
15
16/*
17 * Atomic operations that C can't guarantee us. Useful for
18 * resource counting etc..
19 */
20
21#define ATOMIC_INIT(i) { (i) }
22
23/**
24 * atomic_read - read atomic variable
25 * @v: pointer of type atomic_t
26 *
27 * Atomically reads the value of @v.
28 */
29#define atomic_read(v) (*(volatile int *)&(v)->counter)
30
31/**
32 * atomic_set - set atomic variable
33 * @v: pointer of type atomic_t
34 * @i: required value
35 *
36 * Atomically sets the value of @v to @i.
37 */
38#define atomic_set(v,i) (((v)->counter) = (i))
39
40/**
41 * atomic_add_return - add integer to atomic variable and return it
42 * @i: integer value to add
43 * @v: pointer of type atomic_t
44 *
45 * Atomically adds @i to @v and return (@i + @v).
46 */
47static __inline__ int atomic_add_return(int i, atomic_t *v)
48{
49 unsigned long flags;
50 int result;
51
52 local_irq_save(flags);
53 __asm__ __volatile__ (
54 "# atomic_add_return \n\t"
55 DCACHE_CLEAR("%0", "r4", "%1")
56 M32R_LOCK" %0, @%1; \n\t"
57 "add %0, %2; \n\t"
58 M32R_UNLOCK" %0, @%1; \n\t"
59 : "=&r" (result)
60 : "r" (&v->counter), "r" (i)
61 : "memory"
62#ifdef CONFIG_CHIP_M32700_TS1
63 , "r4"
64#endif /* CONFIG_CHIP_M32700_TS1 */
65 );
66 local_irq_restore(flags);
67
68 return result;
69}
70
71/**
72 * atomic_sub_return - subtract integer from atomic variable and return it
73 * @i: integer value to subtract
74 * @v: pointer of type atomic_t
75 *
76 * Atomically subtracts @i from @v and return (@v - @i).
77 */
78static __inline__ int atomic_sub_return(int i, atomic_t *v)
79{
80 unsigned long flags;
81 int result;
82
83 local_irq_save(flags);
84 __asm__ __volatile__ (
85 "# atomic_sub_return \n\t"
86 DCACHE_CLEAR("%0", "r4", "%1")
87 M32R_LOCK" %0, @%1; \n\t"
88 "sub %0, %2; \n\t"
89 M32R_UNLOCK" %0, @%1; \n\t"
90 : "=&r" (result)
91 : "r" (&v->counter), "r" (i)
92 : "memory"
93#ifdef CONFIG_CHIP_M32700_TS1
94 , "r4"
95#endif /* CONFIG_CHIP_M32700_TS1 */
96 );
97 local_irq_restore(flags);
98
99 return result;
100}
101
102/**
103 * atomic_add - add integer to atomic variable
104 * @i: integer value to add
105 * @v: pointer of type atomic_t
106 *
107 * Atomically adds @i to @v.
108 */
109#define atomic_add(i,v) ((void) atomic_add_return((i), (v)))
110
111/**
112 * atomic_sub - subtract the atomic variable
113 * @i: integer value to subtract
114 * @v: pointer of type atomic_t
115 *
116 * Atomically subtracts @i from @v.
117 */
118#define atomic_sub(i,v) ((void) atomic_sub_return((i), (v)))
119
120/**
121 * atomic_sub_and_test - subtract value from variable and test result
122 * @i: integer value to subtract
123 * @v: pointer of type atomic_t
124 *
125 * Atomically subtracts @i from @v and returns
126 * true if the result is zero, or false for all
127 * other cases.
128 */
129#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
130
131/**
132 * atomic_inc_return - increment atomic variable and return it
133 * @v: pointer of type atomic_t
134 *
135 * Atomically increments @v by 1 and returns the result.
136 */
137static __inline__ int atomic_inc_return(atomic_t *v)
138{
139 unsigned long flags;
140 int result;
141
142 local_irq_save(flags);
143 __asm__ __volatile__ (
144 "# atomic_inc_return \n\t"
145 DCACHE_CLEAR("%0", "r4", "%1")
146 M32R_LOCK" %0, @%1; \n\t"
147 "addi %0, #1; \n\t"
148 M32R_UNLOCK" %0, @%1; \n\t"
149 : "=&r" (result)
150 : "r" (&v->counter)
151 : "memory"
152#ifdef CONFIG_CHIP_M32700_TS1
153 , "r4"
154#endif /* CONFIG_CHIP_M32700_TS1 */
155 );
156 local_irq_restore(flags);
157
158 return result;
159}
160
161/**
162 * atomic_dec_return - decrement atomic variable and return it
163 * @v: pointer of type atomic_t
164 *
165 * Atomically decrements @v by 1 and returns the result.
166 */
167static __inline__ int atomic_dec_return(atomic_t *v)
168{
169 unsigned long flags;
170 int result;
171
172 local_irq_save(flags);
173 __asm__ __volatile__ (
174 "# atomic_dec_return \n\t"
175 DCACHE_CLEAR("%0", "r4", "%1")
176 M32R_LOCK" %0, @%1; \n\t"
177 "addi %0, #-1; \n\t"
178 M32R_UNLOCK" %0, @%1; \n\t"
179 : "=&r" (result)
180 : "r" (&v->counter)
181 : "memory"
182#ifdef CONFIG_CHIP_M32700_TS1
183 , "r4"
184#endif /* CONFIG_CHIP_M32700_TS1 */
185 );
186 local_irq_restore(flags);
187
188 return result;
189}
190
191/**
192 * atomic_inc - increment atomic variable
193 * @v: pointer of type atomic_t
194 *
195 * Atomically increments @v by 1.
196 */
197#define atomic_inc(v) ((void)atomic_inc_return(v))
198
199/**
200 * atomic_dec - decrement atomic variable
201 * @v: pointer of type atomic_t
202 *
203 * Atomically decrements @v by 1.
204 */
205#define atomic_dec(v) ((void)atomic_dec_return(v))
206
207/**
208 * atomic_inc_and_test - increment and test
209 * @v: pointer of type atomic_t
210 *
211 * Atomically increments @v by 1
212 * and returns true if the result is zero, or false for all
213 * other cases.
214 */
215#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
216
217/**
218 * atomic_dec_and_test - decrement and test
219 * @v: pointer of type atomic_t
220 *
221 * Atomically decrements @v by 1 and
222 * returns true if the result is 0, or false for all
223 * other cases.
224 */
225#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
226
227/**
228 * atomic_add_negative - add and test if negative
229 * @v: pointer of type atomic_t
230 * @i: integer value to add
231 *
232 * Atomically adds @i to @v and returns true
233 * if the result is negative, or false when
234 * result is greater than or equal to zero.
235 */
236#define atomic_add_negative(i,v) (atomic_add_return((i), (v)) < 0)
237
238#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
239#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
240
241/**
242 * __atomic_add_unless - add unless the number is a given value
243 * @v: pointer of type atomic_t
244 * @a: the amount to add to v...
245 * @u: ...unless v is equal to u.
246 *
247 * Atomically adds @a to @v, so long as it was not @u.
248 * Returns the old value of @v.
249 */
250static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
251{
252 int c, old;
253 c = atomic_read(v);
254 for (;;) {
255 if (unlikely(c == (u)))
256 break;
257 old = atomic_cmpxchg((v), c, c + (a));
258 if (likely(old == c))
259 break;
260 c = old;
261 }
262 return c;
263}
264
265
266static __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
288static __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
316#endif /* _ASM_M32R_ATOMIC_H */
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
12#include <linux/types.h>
13#include <asm/assembler.h>
14#include <asm/cmpxchg.h>
15#include <asm/dcache_clear.h>
16#include <asm/barrier.h>
17
18/*
19 * Atomic operations that C can't guarantee us. Useful for
20 * resource counting etc..
21 */
22
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 */
31#define atomic_read(v) READ_ONCE((v)->counter)
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) WRITE_ONCE(((v)->counter), (i))
41
42#ifdef CONFIG_CHIP_M32700_TS1
43#define __ATOMIC_CLOBBER , "r4"
44#else
45#define __ATOMIC_CLOBBER
46#endif
47
48#define ATOMIC_OP(op) \
49static __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) \
70static __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; \
90}
91
92#define ATOMIC_FETCH_OP(op) \
93static __inline__ int atomic_fetch_##op(int i, atomic_t *v) \
94{ \
95 unsigned long flags; \
96 int result, val; \
97 \
98 local_irq_save(flags); \
99 __asm__ __volatile__ ( \
100 "# atomic_fetch_" #op " \n\t" \
101 DCACHE_CLEAR("%0", "r4", "%2") \
102 M32R_LOCK" %1, @%2; \n\t" \
103 "mv %0, %1 \n\t" \
104 #op " %1, %3; \n\t" \
105 M32R_UNLOCK" %1, @%2; \n\t" \
106 : "=&r" (result), "=&r" (val) \
107 : "r" (&v->counter), "r" (i) \
108 : "memory" \
109 __ATOMIC_CLOBBER \
110 ); \
111 local_irq_restore(flags); \
112 \
113 return result; \
114}
115
116#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op)
117
118ATOMIC_OPS(add)
119ATOMIC_OPS(sub)
120
121#undef ATOMIC_OPS
122#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op)
123
124ATOMIC_OPS(and)
125ATOMIC_OPS(or)
126ATOMIC_OPS(xor)
127
128#undef ATOMIC_OPS
129#undef ATOMIC_FETCH_OP
130#undef ATOMIC_OP_RETURN
131#undef ATOMIC_OP
132
133/**
134 * atomic_sub_and_test - subtract value from variable and test result
135 * @i: integer value to subtract
136 * @v: pointer of type atomic_t
137 *
138 * Atomically subtracts @i from @v and returns
139 * true if the result is zero, or false for all
140 * other cases.
141 */
142#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
143
144/**
145 * atomic_inc_return - increment atomic variable and return it
146 * @v: pointer of type atomic_t
147 *
148 * Atomically increments @v by 1 and returns the result.
149 */
150static __inline__ int atomic_inc_return(atomic_t *v)
151{
152 unsigned long flags;
153 int result;
154
155 local_irq_save(flags);
156 __asm__ __volatile__ (
157 "# atomic_inc_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"
165 __ATOMIC_CLOBBER
166 );
167 local_irq_restore(flags);
168
169 return result;
170}
171
172/**
173 * atomic_dec_return - decrement atomic variable and return it
174 * @v: pointer of type atomic_t
175 *
176 * Atomically decrements @v by 1 and returns the result.
177 */
178static __inline__ int atomic_dec_return(atomic_t *v)
179{
180 unsigned long flags;
181 int result;
182
183 local_irq_save(flags);
184 __asm__ __volatile__ (
185 "# atomic_dec_return \n\t"
186 DCACHE_CLEAR("%0", "r4", "%1")
187 M32R_LOCK" %0, @%1; \n\t"
188 "addi %0, #-1; \n\t"
189 M32R_UNLOCK" %0, @%1; \n\t"
190 : "=&r" (result)
191 : "r" (&v->counter)
192 : "memory"
193 __ATOMIC_CLOBBER
194 );
195 local_irq_restore(flags);
196
197 return result;
198}
199
200/**
201 * atomic_inc - increment atomic variable
202 * @v: pointer of type atomic_t
203 *
204 * Atomically increments @v by 1.
205 */
206#define atomic_inc(v) ((void)atomic_inc_return(v))
207
208/**
209 * atomic_dec - decrement atomic variable
210 * @v: pointer of type atomic_t
211 *
212 * Atomically decrements @v by 1.
213 */
214#define atomic_dec(v) ((void)atomic_dec_return(v))
215
216/**
217 * atomic_inc_and_test - increment and test
218 * @v: pointer of type atomic_t
219 *
220 * Atomically increments @v by 1
221 * and returns true if the result is zero, or false for all
222 * other cases.
223 */
224#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
225
226/**
227 * atomic_dec_and_test - decrement and test
228 * @v: pointer of type atomic_t
229 *
230 * Atomically decrements @v by 1 and
231 * returns true if the result is 0, or false for all
232 * other cases.
233 */
234#define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
235
236/**
237 * atomic_add_negative - add and test if negative
238 * @v: pointer of type atomic_t
239 * @i: integer value to add
240 *
241 * Atomically adds @i to @v and returns true
242 * if the result is negative, or false when
243 * result is greater than or equal to zero.
244 */
245#define atomic_add_negative(i,v) (atomic_add_return((i), (v)) < 0)
246
247#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
248#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
249
250/**
251 * __atomic_add_unless - add unless the number is a given value
252 * @v: pointer of type atomic_t
253 * @a: the amount to add to v...
254 * @u: ...unless v is equal to u.
255 *
256 * Atomically adds @a to @v, so long as it was not @u.
257 * Returns the old value of @v.
258 */
259static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
260{
261 int c, old;
262 c = atomic_read(v);
263 for (;;) {
264 if (unlikely(c == (u)))
265 break;
266 old = atomic_cmpxchg((v), c, c + (a));
267 if (likely(old == c))
268 break;
269 c = old;
270 }
271 return c;
272}
273
274#endif /* _ASM_M32R_ATOMIC_H */