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 <linux/compiler.h>
  13
  14 static int parse_argv(const char *);
  15
  16 void __weak invalidate_icache_all(void)
  17 {
  18         /* please define arch specific invalidate_icache_all */
  19         puts("No arch specific invalidate_icache_all available!\n");
  20 }
  21
  22 static int do_icache(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  23 {
  24         switch (argc) {
  25         case 2:                 /* on / off     */
  26                 switch (parse_argv(argv[1])) {
  27                 case 0:
  28                         icache_disable();
  29                         break;
  30                 case 1:
  31                         icache_enable();
  32                         break;
  33                 case 2:
  34                         invalidate_icache_all();
  35                         break;
  36                 }
  37                 break;
  38         case 1:                 /* get status */
  39                 printf("Instruction Cache is %s\n",
  40                         icache_status() ? "ON" : "OFF");
  41                 return 0;
  42         default:
  43                 return CMD_RET_USAGE;
  44         }
  45         return 0;
  46 }
  47
  48 void __weak flush_dcache_all(void)
  49 {
  50         puts("No arch specific flush_dcache_all available!\n");
  51         /* please define arch specific flush_dcache_all */
  52 }
  53
  54 static int do_dcache(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  55 {
  56         switch (argc) {
  57         case 2:                 /* on / off */
  58                 switch (parse_argv(argv[1])) {
  59                 case 0:
  60                         dcache_disable();
  61                         break;
  62                 case 1:
  63                         dcache_enable();
  64                         break;
  65                 case 2:
  66                         flush_dcache_all();
  67                         break;
  68                 }
  69                 break;
  70         case 1:                 /* get status */
  71                 printf("Data (writethrough) Cache is %s\n",
  72                         dcache_status() ? "ON" : "OFF");
  73                 return 0;
  74         default:
  75                 return CMD_RET_USAGE;
  76         }
  77         return 0;
  78 }
  79
  80 static int parse_argv(const char *s)
  81 {
  82         if (strcmp(s, "flush") == 0)
  83                 return 2;
  84         else if (strcmp(s, "on") == 0)
  85                 return 1;
  86         else if (strcmp(s, "off") == 0)
  87                 return 0;
  88
  89         return -1;
  90 }
  91
  92
  93 U_BOOT_CMD(
  94         icache,   2,   1,     do_icache,
  95         "enable or disable instruction cache",
  96         "[on, off, flush]\n"
  97         "    - enable, disable, or flush instruction cache"
  98 );
  99
 100 U_BOOT_CMD(
 101         dcache,   2,   1,     do_dcache,
 102         "enable or disable data cache",
 103         "[on, off, flush]\n"
 104         "    - enable, disable, or flush data (writethrough) cache"
 105 );