xref: /openbmc/u-boot/cmd/fuse.c (revision 7fb82986)
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 <asm/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 );
147