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   1 /* atomic.h: atomic operation emulation for FR-V
   2  *
   3  * For an explanation of how atomic ops work in this arch, see:
   4  *   Documentation/fujitsu/frv/atomic-ops.txt
   5  *
   6  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   7  * Written by David Howells (dhowells@redhat.com)
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  */
  14 #ifndef _ASM_ATOMIC_H
  15 #define _ASM_ATOMIC_H
  16
  17 #include <linux/config.h>
  18 #include <linux/types.h>
  19 #include <asm/spr-regs.h>
  20
  21 #ifdef CONFIG_SMP
  22 #error not SMP safe
  23 #endif
  24
  25 /*
  26  * Atomic operations that C can't guarantee us.  Useful for
  27  * resource counting etc..
  28  *
  29  * We do not have SMP systems, so we don't have to deal with that.
  30  */
  31
  32 /* Atomic operations are already serializing */
  33 #define smp_mb__before_atomic_dec()     barrier()
  34 #define smp_mb__after_atomic_dec()      barrier()
  35 #define smp_mb__before_atomic_inc()     barrier()
  36 #define smp_mb__after_atomic_inc()      barrier()
  37
  38 typedef struct {
  39         int counter;
  40 } atomic_t;
  41
  42 #define ATOMIC_INIT(i)          { (i) }
  43 #define atomic_read(v)          ((v)->counter)
  44 #define atomic_set(v, i)        (((v)->counter) = (i))
  45
  46 #ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
  47 static inline int atomic_add_return(int i, atomic_t *v)
  48 {
  49         unsigned long val;
  50
  51         asm("0:                                         \n"
  52             "   orcc            gr0,gr0,gr0,icc3        \n"     /* set ICC3.Z */
  53             "   ckeq            icc3,cc7                \n"
  54             "   ld.p            %M0,%1                  \n"     /* LD.P/ORCR must be atomic */
  55             "   orcr            cc7,cc7,cc3             \n"     /* set CC3 to true */
  56             "   add%I2          %1,%2,%1                \n"
  57             "   cst.p           %1,%M0          ,cc3,#1 \n"
  58             "   corcc           gr29,gr29,gr0   ,cc3,#1 \n"     /* clear ICC3.Z if store happens */
  59             "   beq             icc3,#0,0b              \n"
  60             : "+U"(v->counter), "=&r"(val)
  61             : "NPr"(i)
  62             : "memory", "cc7", "cc3", "icc3"
  63             );
  64
  65         return val;
  66 }
  67
  68 static inline int atomic_sub_return(int i, atomic_t *v)
  69 {
  70         unsigned long val;
  71
  72         asm("0:                                         \n"
  73             "   orcc            gr0,gr0,gr0,icc3        \n"     /* set ICC3.Z */
  74             "   ckeq            icc3,cc7                \n"
  75             "   ld.p            %M0,%1                  \n"     /* LD.P/ORCR must be atomic */
  76             "   orcr            cc7,cc7,cc3             \n"     /* set CC3 to true */
  77             "   sub%I2          %1,%2,%1                \n"
  78             "   cst.p           %1,%M0          ,cc3,#1 \n"
  79             "   corcc           gr29,gr29,gr0   ,cc3,#1 \n"     /* clear ICC3.Z if store happens */
  80             "   beq             icc3,#0,0b              \n"
  81             : "+U"(v->counter), "=&r"(val)
  82             : "NPr"(i)
  83             : "memory", "cc7", "cc3", "icc3"
  84             );
  85
  86         return val;
  87 }
  88
  89 #else
  90
  91 extern int atomic_add_return(int i, atomic_t *v);
  92 extern int atomic_sub_return(int i, atomic_t *v);
  93
  94 #endif
  95
  96 static inline int atomic_add_negative(int i, atomic_t *v)
  97 {
  98         return atomic_add_return(i, v) < 0;
  99 }
 100
 101 static inline void atomic_add(int i, atomic_t *v)
 102 {
 103         atomic_add_return(i, v);
 104 }
 105
 106 static inline void atomic_sub(int i, atomic_t *v)
 107 {
 108         atomic_sub_return(i, v);
 109 }
 110
 111 static inline void atomic_inc(atomic_t *v)
 112 {
 113         atomic_add_return(1, v);
 114 }
 115
 116 static inline void atomic_dec(atomic_t *v)
 117 {
 118         atomic_sub_return(1, v);
 119 }
 120
 121 #define atomic_dec_return(v)            atomic_sub_return(1, (v))
 122 #define atomic_inc_return(v)            atomic_add_return(1, (v))
 123
 124 #define atomic_sub_and_test(i,v)        (atomic_sub_return((i), (v)) == 0)
 125 #define atomic_dec_and_test(v)          (atomic_sub_return(1, (v)) == 0)
 126 #define atomic_inc_and_test(v)          (atomic_add_return(1, (v)) == 0)
 127
 128 #ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
 129 static inline
 130 unsigned long atomic_test_and_ANDNOT_mask(unsigned long mask, volatile unsigned long *v)
 131 {
 132         unsigned long old, tmp;
 133
 134         asm volatile(
 135                 "0:                                             \n"
 136                 "       orcc            gr0,gr0,gr0,icc3        \n"     /* set ICC3.Z */
 137                 "       ckeq            icc3,cc7                \n"
 138                 "       ld.p            %M0,%1                  \n"     /* LD.P/ORCR are atomic */
 139                 "       orcr            cc7,cc7,cc3             \n"     /* set CC3 to true */
 140                 "       and%I3          %1,%3,%2                \n"
 141                 "       cst.p           %2,%M0          ,cc3,#1 \n"     /* if store happens... */
 142                 "       corcc           gr29,gr29,gr0   ,cc3,#1 \n"     /* ... clear ICC3.Z */
 143                 "       beq             icc3,#0,0b              \n"
 144                 : "+U"(*v), "=&r"(old), "=r"(tmp)
 145                 : "NPr"(~mask)
 146                 : "memory", "cc7", "cc3", "icc3"
 147                 );
 148
 149         return old;
 150 }
 151
 152 static inline
 153 unsigned long atomic_test_and_OR_mask(unsigned long mask, volatile unsigned long *v)
 154 {
 155         unsigned long old, tmp;
 156
 157         asm volatile(
 158                 "0:                                             \n"
 159                 "       orcc            gr0,gr0,gr0,icc3        \n"     /* set ICC3.Z */
 160                 "       ckeq            icc3,cc7                \n"
 161                 "       ld.p            %M0,%1                  \n"     /* LD.P/ORCR are atomic */
 162                 "       orcr            cc7,cc7,cc3             \n"     /* set CC3 to true */
 163                 "       or%I3           %1,%3,%2                \n"
 164                 "       cst.p           %2,%M0          ,cc3,#1 \n"     /* if store happens... */
 165                 "       corcc           gr29,gr29,gr0   ,cc3,#1 \n"     /* ... clear ICC3.Z */
 166                 "       beq             icc3,#0,0b              \n"
 167                 : "+U"(*v), "=&r"(old), "=r"(tmp)
 168                 : "NPr"(mask)
 169                 : "memory", "cc7", "cc3", "icc3"
 170                 );
 171
 172         return old;
 173 }
 174
 175 static inline
 176 unsigned long atomic_test_and_XOR_mask(unsigned long mask, volatile unsigned long *v)
 177 {
 178         unsigned long old, tmp;
 179
 180         asm volatile(
 181                 "0:                                             \n"
 182                 "       orcc            gr0,gr0,gr0,icc3        \n"     /* set ICC3.Z */
 183                 "       ckeq            icc3,cc7                \n"
 184                 "       ld.p            %M0,%1                  \n"     /* LD.P/ORCR are atomic */
 185                 "       orcr            cc7,cc7,cc3             \n"     /* set CC3 to true */
 186                 "       xor%I3          %1,%3,%2                \n"
 187                 "       cst.p           %2,%M0          ,cc3,#1 \n"     /* if store happens... */
 188                 "       corcc           gr29,gr29,gr0   ,cc3,#1 \n"     /* ... clear ICC3.Z */
 189                 "       beq             icc3,#0,0b              \n"
 190                 : "+U"(*v), "=&r"(old), "=r"(tmp)
 191                 : "NPr"(mask)
 192                 : "memory", "cc7", "cc3", "icc3"
 193                 );
 194
 195         return old;
 196 }
 197
 198 #else
 199
 200 extern unsigned long atomic_test_and_ANDNOT_mask(unsigned long mask, volatile unsigned long *v);
 201 extern unsigned long atomic_test_and_OR_mask(unsigned long mask, volatile unsigned long *v);
 202 extern unsigned long atomic_test_and_XOR_mask(unsigned long mask, volatile unsigned long *v);
 203
 204 #endif
 205
 206 #define atomic_clear_mask(mask, v)      atomic_test_and_ANDNOT_mask((mask), (v))
 207 #define atomic_set_mask(mask, v)        atomic_test_and_OR_mask((mask), (v))
 208
 209 /*****************************************************************************/
 210 /*
 211  * exchange value with memory
 212  */
 213 #ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
 214
 215 #define xchg(ptr, x)                                                            \
 216 ({                                                                              \
 217         __typeof__(ptr) __xg_ptr = (ptr);                                       \
 218         __typeof__(*(ptr)) __xg_orig;                                           \
 219                                                                                 \
 220         switch (sizeof(__xg_orig)) {                                            \
 221         case 1:                                                                 \
 222                 asm volatile(                                                   \
 223                         "0:                                             \n"     \
 224                         "       orcc            gr0,gr0,gr0,icc3        \n"     \
 225                         "       ckeq            icc3,cc7                \n"     \
 226                         "       ldub.p          %M0,%1                  \n"     \
 227                         "       orcr            cc7,cc7,cc3             \n"     \
 228                         "       cstb.p          %2,%M0          ,cc3,#1 \n"     \
 229                         "       corcc           gr29,gr29,gr0   ,cc3,#1 \n"     \
 230                         "       beq             icc3,#0,0b              \n"     \
 231                         : "+U"(*__xg_ptr), "=&r"(__xg_orig)                     \
 232                         : "r"(x)                                                \
 233                         : "memory", "cc7", "cc3", "icc3"                        \
 234                         );                                                      \
 235                 break;                                                          \
 236                                                                                 \
 237         case 2:                                                                 \
 238                 asm volatile(                                                   \
 239                         "0:                                             \n"     \
 240                         "       orcc            gr0,gr0,gr0,icc3        \n"     \
 241                         "       ckeq            icc3,cc7                \n"     \
 242                         "       lduh.p          %M0,%1                  \n"     \
 243                         "       orcr            cc7,cc7,cc3             \n"     \
 244                         "       csth.p          %2,%M0          ,cc3,#1 \n"     \
 245                         "       corcc           gr29,gr29,gr0   ,cc3,#1 \n"     \
 246                         "       beq             icc3,#0,0b              \n"     \
 247                         : "+U"(*__xg_ptr), "=&r"(__xg_orig)                     \
 248                         : "r"(x)                                                \
 249                         : "memory", "cc7", "cc3", "icc3"                        \
 250                         );                                                      \
 251                 break;                                                          \
 252                                                                                 \
 253         case 4:                                                                 \
 254                 asm volatile(                                                   \
 255                         "0:                                             \n"     \
 256                         "       orcc            gr0,gr0,gr0,icc3        \n"     \
 257                         "       ckeq            icc3,cc7                \n"     \
 258                         "       ld.p            %M0,%1                  \n"     \
 259                         "       orcr            cc7,cc7,cc3             \n"     \
 260                         "       cst.p           %2,%M0          ,cc3,#1 \n"     \
 261                         "       corcc           gr29,gr29,gr0   ,cc3,#1 \n"     \
 262                         "       beq             icc3,#0,0b              \n"     \
 263                         : "+U"(*__xg_ptr), "=&r"(__xg_orig)                     \
 264                         : "r"(x)                                                \
 265                         : "memory", "cc7", "cc3", "icc3"                        \
 266                         );                                                      \
 267                 break;                                                          \
 268                                                                                 \
 269         default:                                                                \
 270                 __xg_orig = 0;                                                  \
 271                 asm volatile("break");                                          \
 272                 break;                                                          \
 273         }                                                                       \
 274                                                                                 \
 275         __xg_orig;                                                              \
 276 })
 277
 278 #else
 279
 280 extern uint8_t  __xchg_8 (uint8_t i,  volatile void *v);
 281 extern uint16_t __xchg_16(uint16_t i, volatile void *v);
 282 extern uint32_t __xchg_32(uint32_t i, volatile void *v);
 283
 284 #define xchg(ptr, x)                                                                            \
 285 ({                                                                                              \
 286         __typeof__(ptr) __xg_ptr = (ptr);                                                       \
 287         __typeof__(*(ptr)) __xg_orig;                                                           \
 288                                                                                                 \
 289         switch (sizeof(__xg_orig)) {                                                            \
 290         case 1: __xg_orig = (__typeof__(*(ptr))) __xchg_8 ((uint8_t)  x, __xg_ptr);     break;  \
 291         case 2: __xg_orig = (__typeof__(*(ptr))) __xchg_16((uint16_t) x, __xg_ptr);     break;  \
 292         case 4: __xg_orig = (__typeof__(*(ptr))) __xchg_32((uint32_t) x, __xg_ptr);     break;  \
 293         default:                                                                                \
 294                 __xg_orig = 0;                                                                  \
 295                 asm volatile("break");                                                          \
 296                 break;                                                                          \
 297         }                                                                                       \
 298         __xg_orig;                                                                              \
 299 })
 300
 301 #endif
 302
 303 #define tas(ptr) (xchg((ptr), 1))
 304
 305 /*****************************************************************************/
 306 /*
 307  * compare and conditionally exchange value with memory
 308  * - if (*ptr == test) then orig = *ptr; *ptr = test;
 309  * - if (*ptr != test) then orig = *ptr;
 310  */
 311 #ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
 312
 313 #define cmpxchg(ptr, test, new)                                                 \
 314 ({                                                                              \
 315         __typeof__(ptr) __xg_ptr = (ptr);                                       \
 316         __typeof__(*(ptr)) __xg_orig, __xg_tmp;                                 \
 317         __typeof__(*(ptr)) __xg_test = (test);                                  \
 318         __typeof__(*(ptr)) __xg_new = (new);                                    \
 319                                                                                 \
 320         switch (sizeof(__xg_orig)) {                                            \
 321         case 1:                                                                 \
 322                 asm volatile(                                                   \
 323                         "0:                                             \n"     \
 324                         "       orcc            gr0,gr0,gr0,icc3        \n"     \
 325                         "       ckeq            icc3,cc7                \n"     \
 326                         "       ldub.p          %M0,%1                  \n"     \
 327                         "       orcr            cc7,cc7,cc3             \n"     \
 328                         "       sub%I4          %1,%4,%2                \n"     \
 329                         "       sllcc           %2,#24,gr0,icc0         \n"     \
 330                         "       bne             icc0,#0,1f              \n"     \
 331                         "       cstb.p          %3,%M0          ,cc3,#1 \n"     \
 332                         "       corcc           gr29,gr29,gr0   ,cc3,#1 \n"     \
 333                         "       beq             icc3,#0,0b              \n"     \
 334                         "1:                                             \n"     \
 335                         : "+U"(*__xg_ptr), "=&r"(__xg_orig), "=&r"(__xg_tmp)    \
 336                         : "r"(__xg_new), "NPr"(__xg_test)                       \
 337                         : "memory", "cc7", "cc3", "icc3", "icc0"                \
 338                         );                                                      \
 339                 break;                                                          \
 340                                                                                 \
 341         case 2:                                                                 \
 342                 asm volatile(                                                   \
 343                         "0:                                             \n"     \
 344                         "       orcc            gr0,gr0,gr0,icc3        \n"     \
 345                         "       ckeq            icc3,cc7                \n"     \
 346                         "       lduh.p          %M0,%1                  \n"     \
 347                         "       orcr            cc7,cc7,cc3             \n"     \
 348                         "       sub%I4          %1,%4,%2                \n"     \
 349                         "       sllcc           %2,#16,gr0,icc0         \n"     \
 350                         "       bne             icc0,#0,1f              \n"     \
 351                         "       csth.p          %3,%M0          ,cc3,#1 \n"     \
 352                         "       corcc           gr29,gr29,gr0   ,cc3,#1 \n"     \
 353                         "       beq             icc3,#0,0b              \n"     \
 354                         "1:                                             \n"     \
 355                         : "+U"(*__xg_ptr), "=&r"(__xg_orig), "=&r"(__xg_tmp)    \
 356                         : "r"(__xg_new), "NPr"(__xg_test)                       \
 357                         : "memory", "cc7", "cc3", "icc3", "icc0"                \
 358                         );                                                      \
 359                 break;                                                          \
 360                                                                                 \
 361         case 4:                                                                 \
 362                 asm volatile(                                                   \
 363                         "0:                                             \n"     \
 364                         "       orcc            gr0,gr0,gr0,icc3        \n"     \
 365                         "       ckeq            icc3,cc7                \n"     \
 366                         "       ld.p            %M0,%1                  \n"     \
 367                         "       orcr            cc7,cc7,cc3             \n"     \
 368                         "       sub%I4cc        %1,%4,%2,icc0           \n"     \
 369                         "       bne             icc0,#0,1f              \n"     \
 370                         "       cst.p           %3,%M0          ,cc3,#1 \n"     \
 371                         "       corcc           gr29,gr29,gr0   ,cc3,#1 \n"     \
 372                         "       beq             icc3,#0,0b              \n"     \
 373                         "1:                                             \n"     \
 374                         : "+U"(*__xg_ptr), "=&r"(__xg_orig), "=&r"(__xg_tmp)    \
 375                         : "r"(__xg_new), "NPr"(__xg_test)                       \
 376                         : "memory", "cc7", "cc3", "icc3", "icc0"                \
 377                         );                                                      \
 378                 break;                                                          \
 379                                                                                 \
 380         default:                                                                \
 381                 __xg_orig = 0;                                                  \
 382                 asm volatile("break");                                          \
 383                 break;                                                          \
 384         }                                                                       \
 385                                                                                 \
 386         __xg_orig;                                                              \
 387 })
 388
 389 #else
 390
 391 extern uint8_t  __cmpxchg_8 (uint8_t *v,  uint8_t test,  uint8_t new);
 392 extern uint16_t __cmpxchg_16(uint16_t *v, uint16_t test, uint16_t new);
 393 extern uint32_t __cmpxchg_32(uint32_t *v, uint32_t test, uint32_t new);
 394
 395 #define cmpxchg(ptr, test, new)                                                 \
 396 ({                                                                              \
 397         __typeof__(ptr) __xg_ptr = (ptr);                                       \
 398         __typeof__(*(ptr)) __xg_orig;                                           \
 399         __typeof__(*(ptr)) __xg_test = (test);                                  \
 400         __typeof__(*(ptr)) __xg_new = (new);                                    \
 401                                                                                 \
 402         switch (sizeof(__xg_orig)) {                                            \
 403         case 1: __xg_orig = __cmpxchg_8 (__xg_ptr, __xg_test, __xg_new); break; \
 404         case 2: __xg_orig = __cmpxchg_16(__xg_ptr, __xg_test, __xg_new); break; \
 405         case 4: __xg_orig = __cmpxchg_32(__xg_ptr, __xg_test, __xg_new); break; \
 406         default:                                                                \
 407                 __xg_orig = 0;                                                  \
 408                 asm volatile("break");                                          \
 409                 break;                                                          \
 410         }                                                                       \
 411                                                                                 \
 412         __xg_orig;                                                              \
 413 })
 414
 415 #endif
 416
 417 #endif /* _ASM_ATOMIC_H */