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
strtou32(const char * str,unsigned int base,u32 * result)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
confirm_prog(void)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
do_fuse(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])43 static int do_fuse(struct cmd_tbl *cmdtp, int flag, int argc,
44 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 );
147