LXR uboot/cmd/fuse.c

   1/*
   2 * (C) Copyright 2009-2013 ADVANSEE
   3 * Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
   4 *
   5 * Based on the mpc512x iim code:
   6 * Copyright 2008 Silicon Turnkey Express, Inc.
   7 * Martha Marx <mmarx@silicontkx.com>
   8 *
   9 * SPDX-License-Identifier:     GPL-2.0+
  10 */
  11
  12#include <common.h>
  13#include <command.h>
  14#include <console.h>
  15#include <fuse.h>
  16#include <linux/errno.h>
  17
  18static 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
  29static 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
  44static int do_fuse(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
  45{
  46        const char *op = argc >= 2 ? argv[1] : NULL;
  47        int confirmed = argc >= 3 && !strcmp(argv[2], "-y");
  48        u32 bank, word, cnt, val;
  49        int ret, i;
  50
  51        argc -= 2 + confirmed;
  52        argv += 2 + confirmed;
  53
  54        if (argc < 2 || strtou32(argv[0], 0, &bank) ||
  55                        strtou32(argv[1], 0, &word))
  56                return CMD_RET_USAGE;
  57
  58        if (!strcmp(op, "read")) {
  59                if (argc == 2)
  60                        cnt = 1;
  61                else if (argc != 3 || strtou32(argv[2], 0, &cnt))
  62                        return CMD_RET_USAGE;
  63
  64                printf("Reading bank %u:\n", bank);
  65                for (i = 0; i < cnt; i++, word++) {
  66                        if (!(i % 4))
  67                                printf("\nWord 0x%.8x:", word);
  68
  69                        ret = fuse_read(bank, word, &val);
  70                        if (ret)
  71                                goto err;
  72
  73                        printf(" %.8x", val);
  74                }
  75                putc('\n');
  76        } else if (!strcmp(op, "sense")) {
  77                if (argc == 2)
  78                        cnt = 1;
  79                else if (argc != 3 || strtou32(argv[2], 0, &cnt))
  80                        return CMD_RET_USAGE;
  81
  82                printf("Sensing bank %u:\n", bank);
  83                for (i = 0; i < cnt; i++, word++) {
  84                        if (!(i % 4))
  85                                printf("\nWord 0x%.8x:", word);
  86
  87                        ret = fuse_sense(bank, word, &val);
  88                        if (ret)
  89                                goto err;
  90
  91                        printf(" %.8x", val);
  92                }
  93                putc('\n');
  94        } else if (!strcmp(op, "prog")) {
  95                if (argc < 3)
  96                        return CMD_RET_USAGE;
  97
  98                for (i = 2; i < argc; i++, word++) {
  99                        if (strtou32(argv[i], 16, &val))
 100                                return CMD_RET_USAGE;
 101
 102                        printf("Programming bank %u word 0x%.8x to 0x%.8x...\n",
 103                                        bank, word, val);
 104                        if (!confirmed && !confirm_prog())
 105                                return CMD_RET_FAILURE;
 106                        ret = fuse_prog(bank, word, val);
 107                        if (ret)
 108                                goto err;
 109                }
 110        } else if (!strcmp(op, "override")) {
 111                if (argc < 3)
 112                        return CMD_RET_USAGE;
 113
 114                for (i = 2; i < argc; i++, word++) {
 115                        if (strtou32(argv[i], 16, &val))
 116                                return CMD_RET_USAGE;
 117
 118                        printf("Overriding bank %u word 0x%.8x with "
 119                                        "0x%.8x...\n", bank, word, val);
 120                        ret = fuse_override(bank, word, val);
 121                        if (ret)
 122                                goto err;
 123                }
 124        } else {
 125                return CMD_RET_USAGE;
 126        }
 127
 128        return 0;
 129
 130err:
 131        puts("ERROR\n");
 132        return CMD_RET_FAILURE;
 133}
 134
 135U_BOOT_CMD(
 136        fuse, CONFIG_SYS_MAXARGS, 0, do_fuse,
 137        "Fuse sub-system",
 138             "read <bank> <word> [<cnt>] - read 1 or 'cnt' fuse words,\n"
 139        "    starting at 'word'\n"
 140        "fuse sense <bank> <word> [<cnt>] - sense 1 or 'cnt' fuse words,\n"
 141        "    starting at 'word'\n"
 142        "fuse prog [-y] <bank> <word> <hexval> [<hexval>...] - program 1 or\n"
 143        "    several fuse words, starting at 'word' (PERMANENT)\n"
 144        "fuse override <bank> <word> <hexval> [<hexval>...] - override 1 or\n"
 145        "    several fuse words, starting at 'word'"
 146);
 147