cmd/cache.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 /*
   8  * Cache support: switch on or off, get status
   9  */
  10 #include <common.h>
  11 #include <command.h>
  12 #include <cpu_func.h>
  13 #include <linux/compiler.h>
  14
  15 static int parse_argv(const char *);
  16
  17 void __weak invalidate_icache_all(void)
  18 {
  19         /* please define arch specific invalidate_icache_all */
  20         puts("No arch specific invalidate_icache_all available!\n");
  21 }
  22
  23 static int do_icache(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  24 {
  25         switch (argc) {
  26         case 2:                 /* on / off / flush */
  27                 switch (parse_argv(argv[1])) {
  28                 case 0:
  29                         icache_disable();
  30                         break;
  31                 case 1:
  32                         icache_enable();
  33                         break;
  34                 case 2:
  35                         invalidate_icache_all();
  36                         break;
  37                 default:
  38                         return CMD_RET_USAGE;
  39                 }
  40                 break;
  41         case 1:                 /* get status */
  42                 printf("Instruction Cache is %s\n",
  43                         icache_status() ? "ON" : "OFF");
  44                 return 0;
  45         default:
  46                 return CMD_RET_USAGE;
  47         }
  48         return 0;
  49 }
  50
  51 void __weak flush_dcache_all(void)
  52 {
  53         puts("No arch specific flush_dcache_all available!\n");
  54         /* please define arch specific flush_dcache_all */
  55 }
  56
  57 static int do_dcache(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  58 {
  59         switch (argc) {
  60         case 2:                 /* on / off / flush */
  61                 switch (parse_argv(argv[1])) {
  62                 case 0:
  63                         dcache_disable();
  64                         break;
  65                 case 1:
  66                         dcache_enable();
  67                         break;
  68                 case 2:
  69                         flush_dcache_all();
  70                         break;
  71                 default:
  72                         return CMD_RET_USAGE;
  73                 }
  74                 break;
  75         case 1:                 /* get status */
  76                 printf("Data (writethrough) Cache is %s\n",
  77                         dcache_status() ? "ON" : "OFF");
  78                 return 0;
  79         default:
  80                 return CMD_RET_USAGE;
  81         }
  82         return 0;
  83 }
  84
  85 static int parse_argv(const char *s)
  86 {
  87         if (strcmp(s, "flush") == 0)
  88                 return 2;
  89         else 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         "enable or disable instruction cache",
 101         "[on, off, flush]\n"
 102         "    - enable, disable, or flush instruction cache"
 103 );
 104
 105 U_BOOT_CMD(
 106         dcache,   2,   1,     do_dcache,
 107         "enable or disable data cache",
 108         "[on, off, flush]\n"
 109         "    - enable, disable, or flush data (writethrough) cache"
 110 );