lib_ppc/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 #include <common.h>
  25 #include <asm/cache.h>
  26
  27 void flush_cache (ulong start_addr, ulong size)
  28 {
  29 #ifndef CONFIG_5xx
  30         ulong addr, end_addr = start_addr + size;
  31
  32         if (CFG_CACHELINE_SIZE) {
  33                 addr = start_addr & (CFG_CACHELINE_SIZE - 1);
  34                 for (addr = start_addr;
  35                      addr < end_addr;
  36                      addr += CFG_CACHELINE_SIZE) {
  37                         asm ("dcbst 0,%0": :"r" (addr));
  38                 }
  39                 asm ("sync");   /* Wait for all dcbst to complete on bus */
  40
  41                 for (addr = start_addr;
  42                      addr < end_addr;
  43                      addr += CFG_CACHELINE_SIZE) {
  44                         asm ("icbi 0,%0": :"r" (addr));
  45                 }
  46         }
  47         asm ("sync");           /* Always flush prefetch queue in any case */
  48         asm ("isync");
  49 #endif
  50 }