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Linux/arch/mips/include/asm/bcache.h

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  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 */
 88 

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