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