arch/mips/include/asm/bcache.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (c) 1997, 1999 by Ralf Baechle
   7  * Copyright (c) 1999 Silicon Graphics, Inc.
   8  */
   9 #ifndef _ASM_BCACHE_H
  10 #define _ASM_BCACHE_H
  11
  12 #include <linux/types.h>
  13
  14 /* Some R4000 / R4400 / R4600 / R5000 machines may have a non-dma-coherent,
  15    chipset implemented caches.  On machines with other CPUs the CPU does the
  16    cache thing itself. */
  17 struct bcache_ops {
  18         void (*bc_enable)(void);
  19         void (*bc_disable)(void);
  20         void (*bc_wback_inv)(unsigned long page, unsigned long size);
  21         void (*bc_inv)(unsigned long page, unsigned long size);
  22         void (*bc_prefetch_enable)(void);
  23         void (*bc_prefetch_disable)(void);
  24         bool (*bc_prefetch_is_enabled)(void);
  25 };
  26
  27 extern void indy_sc_init(void);
  28
  29 #ifdef CONFIG_BOARD_SCACHE
  30
  31 extern struct bcache_ops *bcops;
  32
  33 static inline void bc_enable(void)
  34 {
  35         bcops->bc_enable();
  36 }
  37
  38 static inline void bc_disable(void)
  39 {
  40         bcops->bc_disable();
  41 }
  42
  43 static inline void bc_wback_inv(unsigned long page, unsigned long size)
  44 {
  45         bcops->bc_wback_inv(page, size);
  46 }
  47
  48 static inline void bc_inv(unsigned long page, unsigned long size)
  49 {
  50         bcops->bc_inv(page, size);
  51 }
  52
  53 static inline void bc_prefetch_enable(void)
  54 {
  55         if (bcops->bc_prefetch_enable)
  56                 bcops->bc_prefetch_enable();
  57 }
  58
  59 static inline void bc_prefetch_disable(void)
  60 {
  61         if (bcops->bc_prefetch_disable)
  62                 bcops->bc_prefetch_disable();
  63 }
  64
  65 static inline bool bc_prefetch_is_enabled(void)
  66 {
  67         if (bcops->bc_prefetch_is_enabled)
  68                 return bcops->bc_prefetch_is_enabled();
  69
  70         return false;
  71 }
  72
  73 #else /* !defined(CONFIG_BOARD_SCACHE) */
  74
  75 /* Not R4000 / R4400 / R4600 / R5000.  */
  76
  77 #define bc_enable() do { } while (0)
  78 #define bc_disable() do { } while (0)
  79 #define bc_wback_inv(page, size) do { } while (0)
  80 #define bc_inv(page, size) do { } while (0)
  81 #define bc_prefetch_enable() do { } while (0)
  82 #define bc_prefetch_disable() do { } while (0)
  83 #define bc_prefetch_is_enabled() 0
  84
  85 #endif /* !defined(CONFIG_BOARD_SCACHE) */
  86
  87 #endif /* _ASM_BCACHE_H */