arch/arm/cpu/s3c44b0/cache.c

   1 /*
   2  * (C) Copyright 2004
   3  * DAVE Srl
   4  * http://www.dave-tech.it
   5  * http://www.wawnet.biz
   6  * mailto:info@wawnet.biz
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <asm/hardware.h>
  30
  31 static void s3c44b0_flush_cache(void)
  32 {
  33         volatile int i;
  34         /* flush cycle */
  35         for(i=0x10002000;i<0x10004800;i+=16)
  36         {
  37                 *((int *)i)=0x0;
  38         }
  39 }
  40
  41 void icache_enable (void)
  42 {
  43         ulong reg;
  44
  45         s3c44b0_flush_cache();
  46
  47         /*
  48                 Init cache
  49                 Non-cacheable area (everything outside RAM)
  50                 0x0000:0000 - 0x0C00:0000
  51          */
  52         NCACHBE0 = 0xC0000000;
  53         NCACHBE1 = 0x00000000;
  54
  55         /*
  56                 Enable chache
  57         */
  58         reg = SYSCFG;
  59         reg |= 0x00000006; /* 8kB */
  60         SYSCFG = reg;
  61 }
  62
  63 void icache_disable (void)
  64 {
  65         ulong reg;
  66
  67         reg = SYSCFG;
  68         reg &= ~0x00000006; /* 8kB */
  69         SYSCFG = reg;
  70 }
  71
  72 int icache_status (void)
  73 {
  74         return 0;
  75 }
  76
  77 void dcache_enable (void)
  78 {
  79         icache_enable();
  80 }
  81
  82 void dcache_disable (void)
  83 {
  84         icache_disable();
  85 }
  86
  87 int dcache_status (void)
  88 {
  89         return dcache_status();
  90 }