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(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])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 );
146