arch/m68k/include/asm/cacheflush_no.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _M68KNOMMU_CACHEFLUSH_H
   3 #define _M68KNOMMU_CACHEFLUSH_H
   4
   5 /*
   6  * (C) Copyright 2000-2010, Greg Ungerer <gerg@snapgear.com>
   7  */
   8 #include <linux/mm.h>
   9 #include <asm/mcfsim.h>
  10
  11 #define flush_cache_all()                       __flush_cache_all()
  12 #define flush_cache_mm(mm)                      do { } while (0)
  13 #define flush_cache_dup_mm(mm)                  do { } while (0)
  14 #define flush_cache_range(vma, start, end)      do { } while (0)
  15 #define flush_cache_page(vma, vmaddr)           do { } while (0)
  16 #define flush_dcache_range(start, len)          __flush_dcache_all()
  17 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
  18 #define flush_dcache_page(page)                 do { } while (0)
  19 #define flush_dcache_mmap_lock(mapping)         do { } while (0)
  20 #define flush_dcache_mmap_unlock(mapping)       do { } while (0)
  21 #define flush_icache_range(start, len)          __flush_icache_all()
  22 #define flush_icache_page(vma,pg)               do { } while (0)
  23 #define flush_icache_user_range(vma,pg,adr,len) do { } while (0)
  24 #define flush_cache_vmap(start, end)            do { } while (0)
  25 #define flush_cache_vunmap(start, end)          do { } while (0)
  26
  27 #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
  28         memcpy(dst, src, len)
  29 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
  30         memcpy(dst, src, len)
  31
  32 void mcf_cache_push(void);
  33
  34 static inline void __clear_cache_all(void)
  35 {
  36 #ifdef CACHE_INVALIDATE
  37         __asm__ __volatile__ (
  38                 "movec  %0, %%CACR\n\t"
  39                 "nop\n\t"
  40                 : : "r" (CACHE_INVALIDATE) );
  41 #endif
  42 }
  43
  44 static inline void __flush_cache_all(void)
  45 {
  46 #ifdef CACHE_PUSH
  47         mcf_cache_push();
  48 #endif
  49         __clear_cache_all();
  50 }
  51
  52 /*
  53  * Some ColdFire parts implement separate instruction and data caches,
  54  * on those we should just flush the appropriate cache. If we don't need
  55  * to do any specific flushing then this will be optimized away.
  56  */
  57 static inline void __flush_icache_all(void)
  58 {
  59 #ifdef CACHE_INVALIDATEI
  60         __asm__ __volatile__ (
  61                 "movec  %0, %%CACR\n\t"
  62                 "nop\n\t"
  63                 : : "r" (CACHE_INVALIDATEI) );
  64 #endif
  65 }
  66
  67 static inline void __flush_dcache_all(void)
  68 {
  69 #ifdef CACHE_PUSH
  70         mcf_cache_push();
  71 #endif
  72 #ifdef CACHE_INVALIDATED
  73         __asm__ __volatile__ (
  74                 "movec  %0, %%CACR\n\t"
  75                 "nop\n\t"
  76                 : : "r" (CACHE_INVALIDATED) );
  77 #else
  78         /* Flush the write buffer */
  79         __asm__ __volatile__ ( "nop" );
  80 #endif
  81 }
  82
  83 /*
  84  * Push cache entries at supplied address. We want to write back any dirty
  85  * data and then invalidate the cache lines associated with this address.
  86  */
  87 static inline void cache_push(unsigned long paddr, int len)
  88 {
  89         __flush_cache_all();
  90 }
  91
  92 /*
  93  * Clear cache entries at supplied address (that is don't write back any
  94  * dirty data).
  95  */
  96 static inline void cache_clear(unsigned long paddr, int len)
  97 {
  98         __clear_cache_all();
  99 }
 100
 101 #endif /* _M68KNOMMU_CACHEFLUSH_H */