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Mike Frysingerd0b01a22008-02-04 19:26:57 -05001/*
2 * cmd_otp.c - interface to Blackfin on-chip One-Time-Programmable memory
3 *
4 * Copyright (c) 2007-2008 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9/* There are 512 128-bit "pages" (0x000 to 0x1FF).
10 * The pages are accessable as 64-bit "halfpages" (an upper and lower half).
11 * The pages are not part of the memory map. There is an OTP controller which
12 * handles scanning in/out of bits. While access is done through OTP MMRs,
13 * the bootrom provides C-callable helper functions to handle the interaction.
14 */
15
16#include <config.h>
17#include <common.h>
18#include <command.h>
19
20#ifdef CONFIG_CMD_OTP
21
22#include <asm/blackfin.h>
23#include <asm/mach-common/bits/otp.h>
24
25static const char *otp_strerror(uint32_t err)
26{
27 switch (err) {
28 case 0: return "no error";
29 case OTP_WRITE_ERROR: return "OTP fuse write error";
30 case OTP_READ_ERROR: return "OTP fuse read error";
31 case OTP_ACC_VIO_ERROR: return "invalid OTP address";
32 case OTP_DATA_MULT_ERROR: return "multiple bad bits detected";
33 case OTP_ECC_MULT_ERROR: return "error in ECC bits";
34 case OTP_PREV_WR_ERROR: return "space already written";
35 case OTP_DATA_SB_WARN: return "single bad bit in half page";
36 case OTP_ECC_SB_WARN: return "single bad bit in ECC";
37 default: return "unknown error";
38 }
39}
40
41#define lowup(x) ((x) % 2 ? "upper" : "lower")
42
43int do_otp(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
44{
45 bool force = false;
46 if (!strcmp(argv[1], "--force")) {
47 force = true;
48 argv[1] = argv[0];
49 argv++;
50 --argc;
51 }
52
53 uint32_t (*otp_func)(uint32_t page, uint32_t flags, uint64_t *page_content);
54 if (!strcmp(argv[1], "read"))
55 otp_func = otp_read;
56 else if (!strcmp(argv[1], "write"))
57 otp_func = otp_write;
58 else {
59 usage:
60 printf("Usage:\n%s\n", cmdtp->usage);
61 return 1;
62 }
63
64 uint64_t *addr = (uint64_t *)simple_strtoul(argv[2], NULL, 16);
65 uint32_t page = simple_strtoul(argv[3], NULL, 16);
66 uint32_t flags, ret;
67 size_t i, count;
68 ulong half;
69
70 if (argc > 4)
71 count = simple_strtoul(argv[4], NULL, 16);
72 else
73 count = 2;
74
75 if (argc > 5) {
76 half = simple_strtoul(argv[5], NULL, 16);
77 if (half != 0 && half != 1) {
78 puts("Error: 'half' can only be '0' or '1'\n");
79 goto usage;
80 }
81 } else
82 half = 0;
83
84 /* do to the nature of OTP, make sure users are sure */
85 if (!force && otp_func == otp_write) {
86 printf(
87 "Writing one time programmable memory\n"
88 "Make sure your operating voltages and temperature are within spec\n"
89 " source address: 0x%p\n"
90 " OTP destination: %s page 0x%03X - %s page 0x%03X\n"
91 " number to write: %ld halfpages\n"
92 " type \"YES\" (no quotes) to confirm: ",
93 addr,
94 lowup(half), page,
95 lowup(half + count - 1), page + (half + count - 1) / 2,
96 half + count
97 );
98
99 i = 0;
100 while (1) {
101 if (tstc()) {
102 const char exp_ans[] = "YES\r";
103 char c;
104 putc(c = getc());
105 if (exp_ans[i++] != c) {
106 printf(" Aborting\n");
107 return 1;
108 } else if (!exp_ans[i]) {
109 puts("\n");
110 break;
111 }
112 }
113 }
114
115 /* Only supported in newer silicon ... enable writing */
116#if (0)
117 otp_command(OTP_INIT, ...);
118#else
119 *pOTP_TIMING = 0x32149485;
120#endif
121 }
122
123 printf("OTP memory %s: addr 0x%08lx page 0x%03X count %ld ... ",
124 argv[1], addr, page, count);
125
126 ret = 0;
127 for (i = half; i < count + half; ++i) {
128 flags = (i % 2) ? OTP_UPPER_HALF : OTP_LOWER_HALF;
129 ret = otp_func(page, flags, addr);
130 if (ret & 0x1)
131 break;
132 else if (ret)
133 puts("W");
134 else
135 puts(".");
136 ++addr;
137 if (i % 2)
138 ++page;
139 }
140 if (ret & 0x1)
141 printf("\nERROR at page 0x%03X (%s-halfpage): 0x%03X: %s\n",
142 page, lowup(i), ret, otp_strerror(ret));
143 else
144 puts(" done\n");
145
146 if (otp_func == otp_write)
147 /* Only supported in newer silicon ... disable writing */
148#if (0)
149 otp_command(OTP_INIT, ...);
150#else
151 *pOTP_TIMING = 0x1485;
152#endif
153
154 return ret;
155}
156
157U_BOOT_CMD(otp, 6, 0, do_otp,
158 "otp - One-Time-Programmable sub-system\n",
159 "read <addr> <page> [count] [half]\n"
160 "otp write [--force] <addr> <page> [count] [half]\n"
161 " - read/write 'count' half-pages starting at page 'page' (offset 'half')\n");
162
163#endif