arch/arm/lib/cache.c

   1 /*
   2  * (C) Copyright 2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /* for now: just dummy functions to satisfy the linker */
   9
  10 #include <common.h>
  11
  12 void  __flush_cache(unsigned long start, unsigned long size)
  13 {
  14 #if defined(CONFIG_ARM1136)
  15         void arm1136_cache_flush(void);
  16
  17         arm1136_cache_flush();
  18 #endif
  19 #ifdef CONFIG_ARM926EJS
  20         /* test and clean, page 2-23 of arm926ejs manual */
  21         asm("0: mrc p15, 0, r15, c7, c10, 3\n\t" "bne 0b\n" : : : "memory");
  22         /* disable write buffer as well (page 2-22) */
  23         asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (0));
  24 #endif
  25         return;
  26 }
  27 void  flush_cache(unsigned long start, unsigned long size)
  28         __attribute__((weak, alias("__flush_cache")));
  29
  30 /*
  31  * Default implementation:
  32  * do a range flush for the entire range
  33  */
  34 void    __flush_dcache_all(void)
  35 {
  36         flush_cache(0, ~0);
  37 }
  38 void    flush_dcache_all(void)
  39         __attribute__((weak, alias("__flush_dcache_all")));
  40
  41
  42 /*
  43  * Default implementation of enable_caches()
  44  * Real implementation should be in platform code
  45  */
  46 void __enable_caches(void)
  47 {
  48         puts("WARNING: Caches not enabled\n");
  49 }
  50 void enable_caches(void)
  51         __attribute__((weak, alias("__enable_caches")));