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 #include <linux/compiler.h>
  30
  31 static int parse_argv(const char *);
  32
  33 void __weak flush_icache(void)
  34 {
  35         /* please define arch specific flush_icache */
  36         puts("No arch specific flush_icache available!\n");
  37 }
  38
  39 int do_icache ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  40 {
  41         switch (argc) {
  42         case 2:                 /* on / off     */
  43                 switch (parse_argv(argv[1])) {
  44                 case 0: icache_disable();
  45                         break;
  46                 case 1: icache_enable ();
  47                         break;
  48                 case 2: flush_icache();
  49                         break;
  50                 }
  51                 /* FALL TROUGH */
  52         case 1:                 /* get status */
  53                 printf ("Instruction Cache is %s\n",
  54                         icache_status() ? "ON" : "OFF");
  55                 return 0;
  56         default:
  57                 return CMD_RET_USAGE;
  58         }
  59         return 0;
  60 }
  61
  62 void __weak flush_dcache(void)
  63 {
  64         puts("No arch specific flush_dcache available!\n");
  65         /* please define arch specific flush_dcache */
  66 }
  67
  68 int do_dcache ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  69 {
  70         switch (argc) {
  71         case 2:                 /* on / off     */
  72                 switch (parse_argv(argv[1])) {
  73                 case 0: dcache_disable();
  74                         break;
  75                 case 1: dcache_enable ();
  76                         break;
  77                 case 2: flush_dcache();
  78                         break;
  79                 }
  80                 /* FALL TROUGH */
  81         case 1:                 /* get status */
  82                 printf ("Data (writethrough) Cache is %s\n",
  83                         dcache_status() ? "ON" : "OFF");
  84                 return 0;
  85         default:
  86                 return CMD_RET_USAGE;
  87         }
  88         return 0;
  89
  90 }
  91
  92 static int parse_argv(const char *s)
  93 {
  94         if (strcmp(s, "flush") == 0) {
  95                 return (2);
  96         } else if (strcmp(s, "on") == 0) {
  97                 return (1);
  98         } else if (strcmp(s, "off") == 0) {
  99                 return (0);
 100         }
 101         return (-1);
 102 }
 103
 104
 105 U_BOOT_CMD(
 106         icache,   2,   1,     do_icache,
 107         "enable or disable instruction cache",
 108         "[on, off, flush]\n"
 109         "    - enable, disable, or flush instruction cache"
 110 );
 111
 112 U_BOOT_CMD(
 113         dcache,   2,   1,     do_dcache,
 114         "enable or disable data cache",
 115         "[on, off, flush]\n"
 116         "    - enable, disable, or flush data (writethrough) cache"
 117 );