cmd/fuse.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2009-2013 ADVANSEE
   4  * Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
   5  *
   6  * Based on the mpc512x iim code:
   7  * Copyright 2008 Silicon Turnkey Express, Inc.
   8  * Martha Marx <mmarx@silicontkx.com>
   9  */
  10
  11 #include <common.h>
  12 #include <command.h>
  13 #include <console.h>
  14 #include <fuse.h>
  15 #include <mapmem.h>
  16 #include <linux/errno.h>
  17
  18 static int strtou32(const char *str, unsigned int base, u32 *result)
  19 {
  20         char *ep;
  21
  22         *result = simple_strtoul(str, &ep, base);
  23         if (ep == str || *ep != '\0')
  24                 return -EINVAL;
  25
  26         return 0;
  27 }
  28
  29 static int confirm_prog(void)
  30 {
  31         puts("Warning: Programming fuses is an irreversible operation!\n"
  32                         "         This may brick your system.\n"
  33                         "         Use this command only if you are sure of "
  34                                         "what you are doing!\n"
  35                         "\nReally perform this fuse programming? <y/N>\n");
  36
  37         if (confirm_yesno())
  38                 return 1;
  39
  40         puts("Fuse programming aborted\n");
  41         return 0;
  42 }
  43
  44 static int do_fuse(struct cmd_tbl *cmdtp, int flag, int argc,
  45                    char *const argv[])
  46 {
  47         const char *op = argc >= 2 ? argv[1] : NULL;
  48         int confirmed = argc >= 3 && !strcmp(argv[2], "-y");
  49         u32 bank, word, cnt, val, cmp;
  50         ulong addr;
  51         void *buf, *start;
  52         int ret, i;
  53
  54         argc -= 2 + confirmed;
  55         argv += 2 + confirmed;
  56
  57         if (argc < 2 || strtou32(argv[0], 0, &bank) ||
  58                         strtou32(argv[1], 0, &word))
  59                 return CMD_RET_USAGE;
  60
  61         if (!strcmp(op, "read")) {
  62                 if (argc == 2)
  63                         cnt = 1;
  64                 else if (argc != 3 || strtou32(argv[2], 0, &cnt))
  65                         return CMD_RET_USAGE;
  66
  67                 printf("Reading bank %u:\n", bank);
  68                 for (i = 0; i < cnt; i++, word++) {
  69                         if (!(i % 4))
  70                                 printf("\nWord 0x%.8x:", word);
  71
  72                         ret = fuse_read(bank, word, &val);
  73                         if (ret)
  74                                 goto err;
  75
  76                         printf(" %.8x", val);
  77                 }
  78                 putc('\n');
  79         } else if (!strcmp(op, "readm")) {
  80                 if (argc == 3)
  81                         cnt = 1;
  82                 else if (argc != 4 || strtou32(argv[3], 0, &cnt))
  83                         return CMD_RET_USAGE;
  84
  85                 addr = simple_strtoul(argv[2], NULL, 16);
  86
  87                 start = map_sysmem(addr, 4);
  88                 buf = start;
  89
  90                 printf("Reading bank %u len %u to 0x%lx\n", bank, cnt, addr);
  91                 for (i = 0; i < cnt; i++, word++) {
  92                         ret = fuse_read(bank, word, &val);
  93                         if (ret)
  94                                 goto err;
  95
  96                         *((u32 *)buf) = val;
  97                         buf += 4;
  98                 }
  99
 100                 unmap_sysmem(start);
 101         } else if (!strcmp(op, "cmp")) {
 102                 if (argc != 3 || strtou32(argv[2], 0, &cmp))
 103                         return CMD_RET_USAGE;
 104
 105                 printf("Comparing bank %u:\n", bank);
 106                 printf("\nWord 0x%.8x:", word);
 107                 printf("\nValue 0x%.8x:", cmp);
 108
 109                 ret = fuse_read(bank, word, &val);
 110                 if (ret)
 111                         goto err;
 112
 113                 printf("0x%.8x\n", val);
 114                 if (val != cmp) {
 115                         printf("failed\n");
 116                         return CMD_RET_FAILURE;
 117                 }
 118                 printf("passed\n");
 119         } else if (!strcmp(op, "sense")) {
 120                 if (argc == 2)
 121                         cnt = 1;
 122                 else if (argc != 3 || strtou32(argv[2], 0, &cnt))
 123                         return CMD_RET_USAGE;
 124
 125                 printf("Sensing bank %u:\n", bank);
 126                 for (i = 0; i < cnt; i++, word++) {
 127                         if (!(i % 4))
 128                                 printf("\nWord 0x%.8x:", word);
 129
 130                         ret = fuse_sense(bank, word, &val);
 131                         if (ret)
 132                                 goto err;
 133
 134                         printf(" %.8x", val);
 135                 }
 136                 putc('\n');
 137         } else if (!strcmp(op, "prog")) {
 138                 if (argc < 3)
 139                         return CMD_RET_USAGE;
 140
 141                 for (i = 2; i < argc; i++, word++) {
 142                         if (strtou32(argv[i], 16, &val))
 143                                 return CMD_RET_USAGE;
 144
 145                         printf("Programming bank %u word 0x%.8x to 0x%.8x...\n",
 146                                         bank, word, val);
 147                         if (!confirmed && !confirm_prog())
 148                                 return CMD_RET_FAILURE;
 149                         ret = fuse_prog(bank, word, val);
 150                         if (ret)
 151                                 goto err;
 152                 }
 153         } else if (!strcmp(op, "override")) {
 154                 if (argc < 3)
 155                         return CMD_RET_USAGE;
 156
 157                 for (i = 2; i < argc; i++, word++) {
 158                         if (strtou32(argv[i], 16, &val))
 159                                 return CMD_RET_USAGE;
 160
 161                         printf("Overriding bank %u word 0x%.8x with "
 162                                         "0x%.8x...\n", bank, word, val);
 163                         ret = fuse_override(bank, word, val);
 164                         if (ret)
 165                                 goto err;
 166                 }
 167         } else {
 168                 return CMD_RET_USAGE;
 169         }
 170
 171         return 0;
 172
 173 err:
 174         puts("ERROR\n");
 175         return CMD_RET_FAILURE;
 176 }
 177
 178 U_BOOT_CMD(
 179         fuse, CONFIG_SYS_MAXARGS, 0, do_fuse,
 180         "Fuse sub-system",
 181              "read <bank> <word> [<cnt>] - read 1 or 'cnt' fuse words,\n"
 182         "    starting at 'word'\n"
 183         "fuse cmp <bank> <word> <hexval> - compare 'hexval' to fuse\n"
 184         "    at 'word'\n"
 185         "fuse readm <bank> <word> <addr> [<cnt>] - read 1 or 'cnt' fuse words,\n"
 186         "    starting at 'word' into memory at 'addr'\n"
 187         "fuse sense <bank> <word> [<cnt>] - sense 1 or 'cnt' fuse words,\n"
 188         "    starting at 'word'\n"
 189         "fuse prog [-y] <bank> <word> <hexval> [<hexval>...] - program 1 or\n"
 190         "    several fuse words, starting at 'word' (PERMANENT)\n"
 191         "fuse override <bank> <word> <hexval> [<hexval>...] - override 1 or\n"
 192         "    several fuse words, starting at 'word'"
 193 );