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 #include <watchdog.h>
  27
  28 void flush_cache(ulong start_addr, ulong size)
  29 {
  30 #ifndef CONFIG_5xx
  31         ulong addr, start, end;
  32
  33         start = start_addr & ~(CONFIG_SYS_CACHELINE_SIZE - 1);
  34         end = start_addr + size - 1;
  35
  36         for (addr = start; (addr <= end) && (addr >= start);
  37                         addr += CONFIG_SYS_CACHELINE_SIZE) {
  38                 asm volatile("dcbst 0,%0" : : "r" (addr) : "memory");
  39                 WATCHDOG_RESET();
  40         }
  41         /* wait for all dcbst to complete on bus */
  42         asm volatile("sync" : : : "memory");
  43
  44         for (addr = start; (addr <= end) && (addr >= start);
  45                         addr += CONFIG_SYS_CACHELINE_SIZE) {
  46                 asm volatile("icbi 0,%0" : : "r" (addr) : "memory");
  47                 WATCHDOG_RESET();
  48         }
  49         asm volatile("sync" : : : "memory");
  50         /* flush prefetch queue */
  51         asm volatile("isync" : : : "memory");
  52 #endif
  53 }