LXR linux/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. */
  17struct 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
  27extern void indy_sc_init(void);
  28
  29#ifdef CONFIG_BOARD_SCACHE
  30
  31extern struct bcache_ops *bcops;
  32
  33static inline void bc_enable(void)
  34{
  35        bcops->bc_enable();
  36}
  37
  38static inline void bc_disable(void)
  39{
  40        bcops->bc_disable();
  41}
  42
  43static inline void bc_wback_inv(unsigned long page, unsigned long size)
  44{
  45        bcops->bc_wback_inv(page, size);
  46}
  47
  48static inline void bc_inv(unsigned long page, unsigned long size)
  49{
  50        bcops->bc_inv(page, size);
  51}
  52
  53static inline void bc_prefetch_enable(void)
  54{
  55        if (bcops->bc_prefetch_enable)
  56                bcops->bc_prefetch_enable();
  57}
  58
  59static inline void bc_prefetch_disable(void)
  60{
  61        if (bcops->bc_prefetch_disable)
  62                bcops->bc_prefetch_disable();
  63}
  64
  65static 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 */
  88