LXR uboot/arch/arm/lib/cache.c

   1/*
   2 * (C) Copyright 2002
   3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4 *
   5 * See file CREDITS for list of people who contributed to this
   6 * project.
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License as
  10 * published by the Free Software Foundation; either version 2 of
  11 * the License, or (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21 * MA 02111-1307 USA
  22 */
  23
  24/* for now: just dummy functions to satisfy the linker */
  25
  26#include <common.h>
  27
  28void  __flush_cache(unsigned long start, unsigned long size)
  29{
  30#if defined(CONFIG_OMAP2420) || defined(CONFIG_ARM1136)
  31        void arm1136_cache_flush(void);
  32
  33        arm1136_cache_flush();
  34#endif
  35#ifdef CONFIG_ARM926EJS
  36        /* test and clean, page 2-23 of arm926ejs manual */
  37        asm("0: mrc p15, 0, r15, c7, c10, 3\n\t" "bne 0b\n" : : : "memory");
  38        /* disable write buffer as well (page 2-22) */
  39        asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (0));
  40#endif
  41        return;
  42}
  43void  flush_cache(unsigned long start, unsigned long size)
  44        __attribute__((weak, alias("__flush_cache")));
  45
  46/*
  47 * Default implementation:
  48 * do a range flush for the entire range
  49 */
  50void    __flush_dcache_all(void)
  51{
  52        flush_cache(0, ~0);
  53}
  54void    flush_dcache_all(void)
  55        __attribute__((weak, alias("__flush_dcache_all")));
  56
  57
  58/*
  59 * Default implementation of enable_caches()
  60 * Real implementation should be in platform code
  61 */
  62void __enable_caches(void)
  63{
  64        puts("WARNING: Caches not enabled\n");
  65}
  66void enable_caches(void)
  67        __attribute__((weak, alias("__enable_caches")));
  68