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 <linux/errno.h>
  16
  17 static int strtou32(const char *str, unsigned int base, u32 *result)
  18 {
  19         char *ep;
  20
  21         *result = simple_strtoul(str, &ep, base);
  22         if (ep == str || *ep != '\0')
  23                 return -EINVAL;
  24
  25         return 0;
  26 }
  27
  28 static int confirm_prog(void)
  29 {
  30         puts("Warning: Programming fuses is an irreversible operation!\n"
  31                         "         This may brick your system.\n"
  32                         "         Use this command only if you are sure of "
  33                                         "what you are doing!\n"
  34                         "\nReally perform this fuse programming? <y/N>\n");
  35
  36         if (confirm_yesno())
  37                 return 1;
  38
  39         puts("Fuse programming aborted\n");
  40         return 0;
  41 }
  42
  43 static int do_fuse(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
  44 {
  45         const char *op = argc >= 2 ? argv[1] : NULL;
  46         int confirmed = argc >= 3 && !strcmp(argv[2], "-y");
  47         u32 bank, word, cnt, val;
  48         int ret, i;
  49
  50         argc -= 2 + confirmed;
  51         argv += 2 + confirmed;
  52
  53         if (argc < 2 || strtou32(argv[0], 0, &bank) ||
  54                         strtou32(argv[1], 0, &word))
  55                 return CMD_RET_USAGE;
  56
  57         if (!strcmp(op, "read")) {
  58                 if (argc == 2)
  59                         cnt = 1;
  60                 else if (argc != 3 || strtou32(argv[2], 0, &cnt))
  61                         return CMD_RET_USAGE;
  62
  63                 printf("Reading bank %u:\n", bank);
  64                 for (i = 0; i < cnt; i++, word++) {
  65                         if (!(i % 4))
  66                                 printf("\nWord 0x%.8x:", word);
  67
  68                         ret = fuse_read(bank, word, &val);
  69                         if (ret)
  70                                 goto err;
  71
  72                         printf(" %.8x", val);
  73                 }
  74                 putc('\n');
  75         } else if (!strcmp(op, "sense")) {
  76                 if (argc == 2)
  77                         cnt = 1;
  78                 else if (argc != 3 || strtou32(argv[2], 0, &cnt))
  79                         return CMD_RET_USAGE;
  80
  81                 printf("Sensing bank %u:\n", bank);
  82                 for (i = 0; i < cnt; i++, word++) {
  83                         if (!(i % 4))
  84                                 printf("\nWord 0x%.8x:", word);
  85
  86                         ret = fuse_sense(bank, word, &val);
  87                         if (ret)
  88                                 goto err;
  89
  90                         printf(" %.8x", val);
  91                 }
  92                 putc('\n');
  93         } else if (!strcmp(op, "prog")) {
  94                 if (argc < 3)
  95                         return CMD_RET_USAGE;
  96
  97                 for (i = 2; i < argc; i++, word++) {
  98                         if (strtou32(argv[i], 16, &val))
  99                                 return CMD_RET_USAGE;
 100
 101                         printf("Programming bank %u word 0x%.8x to 0x%.8x...\n",
 102                                         bank, word, val);
 103                         if (!confirmed && !confirm_prog())
 104                                 return CMD_RET_FAILURE;
 105                         ret = fuse_prog(bank, word, val);
 106                         if (ret)
 107                                 goto err;
 108                 }
 109         } else if (!strcmp(op, "override")) {
 110                 if (argc < 3)
 111                         return CMD_RET_USAGE;
 112
 113                 for (i = 2; i < argc; i++, word++) {
 114                         if (strtou32(argv[i], 16, &val))
 115                                 return CMD_RET_USAGE;
 116
 117                         printf("Overriding bank %u word 0x%.8x with "
 118                                         "0x%.8x...\n", bank, word, val);
 119                         ret = fuse_override(bank, word, val);
 120                         if (ret)
 121                                 goto err;
 122                 }
 123         } else {
 124                 return CMD_RET_USAGE;
 125         }
 126
 127         return 0;
 128
 129 err:
 130         puts("ERROR\n");
 131         return CMD_RET_FAILURE;
 132 }
 133
 134 U_BOOT_CMD(
 135         fuse, CONFIG_SYS_MAXARGS, 0, do_fuse,
 136         "Fuse sub-system",
 137              "read <bank> <word> [<cnt>] - read 1 or 'cnt' fuse words,\n"
 138         "    starting at 'word'\n"
 139         "fuse sense <bank> <word> [<cnt>] - sense 1 or 'cnt' fuse words,\n"
 140         "    starting at 'word'\n"
 141         "fuse prog [-y] <bank> <word> <hexval> [<hexval>...] - program 1 or\n"
 142         "    several fuse words, starting at 'word' (PERMANENT)\n"
 143         "fuse override <bank> <word> <hexval> [<hexval>...] - override 1 or\n"
 144         "    several fuse words, starting at 'word'"
 145 );