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 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 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 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