cmd/cache.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000
   4  * Wolfgang Denk, DENX Software Engineering, [email protected].
   5  */
   6
   7 /*
   8  * Cache support: switch on or off, get status
   9  */
  10 #include <command.h>
  11 #include <cpu_func.h>
  12 #include <linux/compiler.h>
  13
  14 static int parse_argv(const char *);
  15
  16 static int do_icache(struct cmd_tbl *cmdtp, int flag, int argc,
  17                      char *const argv[])
  18 {
  19         switch (argc) {
  20         case 2:                 /* on / off / flush */
  21                 switch (parse_argv(argv[1])) {
  22                 case 0:
  23                         icache_disable();
  24                         break;
  25                 case 1:
  26                         icache_enable();
  27                         break;
  28                 case 2:
  29                         invalidate_icache_all();
  30                         break;
  31                 default:
  32                         return CMD_RET_USAGE;
  33                 }
  34                 break;
  35         case 1:                 /* get status */
  36                 printf("Instruction Cache is %s\n",
  37                         icache_status() ? "ON" : "OFF");
  38                 return 0;
  39         default:
  40                 return CMD_RET_USAGE;
  41         }
  42         return 0;
  43 }
  44
  45 static int do_dcache(struct cmd_tbl *cmdtp, int flag, int argc,
  46                      char *const argv[])
  47 {
  48         switch (argc) {
  49         case 2:                 /* on / off / flush */
  50                 switch (parse_argv(argv[1])) {
  51                 case 0:
  52                         dcache_disable();
  53                         break;
  54                 case 1:
  55                         dcache_enable();
  56 #ifdef CONFIG_SYS_NONCACHED_MEMORY
  57                         noncached_set_region();
  58 #endif
  59                         break;
  60                 case 2:
  61                         flush_dcache_all();
  62                         break;
  63                 default:
  64                         return CMD_RET_USAGE;
  65                 }
  66                 break;
  67         case 1:                 /* get status */
  68                 printf("Data (writethrough) Cache is %s\n",
  69                         dcache_status() ? "ON" : "OFF");
  70                 return 0;
  71         default:
  72                 return CMD_RET_USAGE;
  73         }
  74         return 0;
  75 }
  76
  77 static int parse_argv(const char *s)
  78 {
  79         if (strcmp(s, "flush") == 0)
  80                 return 2;
  81         else if (strcmp(s, "on") == 0)
  82                 return 1;
  83         else if (strcmp(s, "off") == 0)
  84                 return 0;
  85
  86         return -1;
  87 }
  88
  89 U_BOOT_CMD(
  90         icache,   2,   1,     do_icache,
  91         "enable or disable instruction cache",
  92         "[on, off, flush]\n"
  93         "    - enable, disable, or flush instruction cache"
  94 );
  95
  96 U_BOOT_CMD(
  97         dcache,   2,   1,     do_dcache,
  98         "enable or disable data cache",
  99         "[on, off, flush]\n"
 100         "    - enable, disable, or flush data (writethrough) cache"
 101 );