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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
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(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
130 err:
131         puts("ERROR\n");
132         return CMD_RET_FAILURE;
133 }
134
135 U_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 );