common/cmd_cache.c

   1 /*
   2  * (C) Copyright 2000
   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 /*
  25  * Cache support: switch on or off, get status
  26  */
  27 #include <common.h>
  28 #include <command.h>
  29
  30 #if (CONFIG_COMMANDS & CFG_CMD_CACHE)
  31
  32 static int on_off (const char *);
  33
  34 int do_icache ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  35 {
  36         switch (argc) {
  37         case 2:                 /* on / off     */
  38                 switch (on_off(argv[1])) {
  39 #if 0   /* prevented by varargs handling; FALLTROUGH is harmless, too */
  40                 default: printf ("Usage:\n%s\n", cmdtp->usage);
  41                         return;
  42 #endif
  43                 case 0: icache_disable();
  44                         break;
  45                 case 1: icache_enable ();
  46                         break;
  47                 }
  48                 /* FALL TROUGH */
  49         case 1:                 /* get status */
  50                 printf ("Instruction Cache is %s\n",
  51                         icache_status() ? "ON" : "OFF");
  52                 return 0;
  53         default:
  54                 printf ("Usage:\n%s\n", cmdtp->usage);
  55                 return 1;
  56         }
  57         return 0;
  58 }
  59
  60 int do_dcache ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  61 {
  62         switch (argc) {
  63         case 2:                 /* on / off     */
  64                 switch (on_off(argv[1])) {
  65 #if 0   /* prevented by varargs handling; FALLTROUGH is harmless, too */
  66                 default: printf ("Usage:\n%s\n", cmdtp->usage);
  67                         return;
  68 #endif
  69                 case 0: dcache_disable();
  70                         break;
  71                 case 1: dcache_enable ();
  72                         break;
  73                 }
  74                 /* FALL TROUGH */
  75         case 1:                 /* get status */
  76                 printf ("Data (writethrough) Cache is %s\n",
  77                         dcache_status() ? "ON" : "OFF");
  78                 return 0;
  79         default:
  80                 printf ("Usage:\n%s\n", cmdtp->usage);
  81                 return 1;
  82         }
  83         return 0;
  84
  85 }
  86
  87 static int on_off (const char *s)
  88 {
  89         if (strcmp(s, "on") == 0) {
  90                 return (1);
  91         } else if (strcmp(s, "off") == 0) {
  92                 return (0);
  93         }
  94         return (-1);
  95 }
  96
  97
  98 U_BOOT_CMD(
  99         icache,   2,   1,     do_icache,
 100         "icache  - enable or disable instruction cache\n",
 101         "[on, off]\n"
 102         "    - enable or disable instruction cache\n"
 103 );
 104
 105 U_BOOT_CMD(
 106         dcache,   2,   1,     do_dcache,
 107         "dcache  - enable or disable data cache\n",
 108         "[on, off]\n"
 109         "    - enable or disable data (writethrough) cache\n"
 110 );
 111
 112 #endif  /* CFG_CMD_CACHE */