1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
/*
* cmd_otp.c - interface to Blackfin on-chip One-Time-Programmable memory
*
* Copyright (c) 2007-2008 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
/* There are 512 128-bit "pages" (0x000 through 0x1FF).
* The pages are accessable as 64-bit "halfpages" (an upper and lower half).
* The pages are not part of the memory map. There is an OTP controller which
* handles scanning in/out of bits. While access is done through OTP MMRs,
* the bootrom provides C-callable helper functions to handle the interaction.
*/
#include <config.h>
#include <common.h>
#include <command.h>
#include <console.h>
#include <asm/blackfin.h>
#include <asm/clock.h>
#include <asm/mach-common/bits/otp.h>
static const char *otp_strerror(uint32_t err)
{
switch (err) {
case 0: return "no error";
case OTP_WRITE_ERROR: return "OTP fuse write error";
case OTP_READ_ERROR: return "OTP fuse read error";
case OTP_ACC_VIO_ERROR: return "invalid OTP address";
case OTP_DATA_MULT_ERROR: return "multiple bad bits detected";
case OTP_ECC_MULT_ERROR: return "error in ECC bits";
case OTP_PREV_WR_ERROR: return "space already written";
case OTP_DATA_SB_WARN: return "single bad bit in half page";
case OTP_ECC_SB_WARN: return "single bad bit in ECC";
default: return "unknown error";
}
}
#define lowup(x) ((x) % 2 ? "upper" : "lower")
static int check_voltage(void)
{
/* Make sure voltage limits are within datasheet spec */
uint16_t vr_ctl = bfin_read_VR_CTL();
#ifdef __ADSPBF54x__
/* 0.9V <= VDDINT <= 1.1V */
if ((vr_ctl & 0xc) && (vr_ctl & 0xc0) == 0xc0)
return 1;
#else
/* for the parts w/out qualification yet */
(void)vr_ctl;
#endif
return 0;
}
static void set_otp_timing(bool write)
{
static uint32_t timing;
if (!timing) {
uint32_t tp1, tp2, tp3;
/* OTP_TP1 = 1000 / sclk_period (in nanoseconds)
* OTP_TP1 = 1000 / (1 / get_sclk() * 10^9)
* OTP_TP1 = (1000 * get_sclk()) / 10^9
* OTP_TP1 = get_sclk() / 10^6
*/
tp1 = get_sclk() / 1000000;
/* OTP_TP2 = 400 / (2 * sclk_period)
* OTP_TP2 = 400 / (2 * 1 / get_sclk() * 10^9)
* OTP_TP2 = (400 * get_sclk()) / (2 * 10^9)
* OTP_TP2 = (2 * get_sclk()) / 10^7
*/
tp2 = (2 * get_sclk() / 10000000) << 8;
/* OTP_TP3 = magic constant */
tp3 = (0x1401) << 15;
timing = tp1 | tp2 | tp3;
}
bfrom_OtpCommand(OTP_INIT, write ? timing : timing & ~(-1 << 15));
}
int do_otp(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
char *cmd;
uint32_t ret, base_flags;
bool prompt_user, force_read;
uint32_t (*otp_func)(uint32_t page, uint32_t flags, uint64_t *page_content);
if (argc < 4) {
usage:
return CMD_RET_USAGE;
}
prompt_user = false;
base_flags = 0;
cmd = argv[1];
if (!strcmp(cmd, "read"))
otp_func = bfrom_OtpRead;
else if (!strcmp(cmd, "dump")) {
otp_func = bfrom_OtpRead;
force_read = true;
} else if (!strcmp(cmd, "write")) {
otp_func = bfrom_OtpWrite;
base_flags = OTP_CHECK_FOR_PREV_WRITE;
if (!strcmp(argv[2], "--force")) {
argv++;
--argc;
} else
prompt_user = false;
} else if (!strcmp(cmd, "lock")) {
if (argc != 4)
goto usage;
otp_func = bfrom_OtpWrite;
base_flags = OTP_LOCK;
} else
goto usage;
uint64_t *addr = (uint64_t *)simple_strtoul(argv[2], NULL, 16);
uint32_t page = simple_strtoul(argv[3], NULL, 16);
uint32_t flags;
size_t i, count;
ulong half;
if (argc > 4)
count = simple_strtoul(argv[4], NULL, 16);
else
count = 2;
if (argc > 5) {
half = simple_strtoul(argv[5], NULL, 16);
if (half != 0 && half != 1) {
puts("Error: 'half' can only be '0' or '1'\n");
goto usage;
}
} else
half = 0;
/* "otp lock" has slightly different semantics */
if (base_flags & OTP_LOCK) {
count = page;
page = (uint32_t)addr;
addr = NULL;
}
/* do to the nature of OTP, make sure users are sure */
if (prompt_user) {
printf(
"Writing one time programmable memory\n"
"Make sure your operating voltages and temperature are within spec\n"
" source address: 0x%p\n"
" OTP destination: %s page 0x%03X - %s page 0x%03lX\n"
" number to write: %lu halfpages\n"
" type \"YES\" (no quotes) to confirm: ",
addr,
lowup(half), page,
lowup(half + count - 1), page + (half + count - 1) / 2,
half + count
);
if (!confirm_yesno()) {
printf(" Aborting\n");
return 1;
}
}
printf("OTP memory %s: addr 0x%p page 0x%03X count %zu ... ",
cmd, addr, page, count);
set_otp_timing(otp_func == bfrom_OtpWrite);
if (otp_func == bfrom_OtpWrite && check_voltage()) {
puts("ERROR: VDDINT voltage is out of spec for writing\n");
return -1;
}
/* Do the actual reading/writing stuff */
ret = 0;
for (i = half; i < count + half; ++i) {
flags = base_flags | (i % 2 ? OTP_UPPER_HALF : OTP_LOWER_HALF);
try_again:
ret = otp_func(page, flags, addr);
if (ret & OTP_MASTER_ERROR) {
if (force_read) {
if (flags & OTP_NO_ECC)
break;
else
flags |= OTP_NO_ECC;
puts("E");
goto try_again;
} else
break;
} else if (ret)
puts("W");
else
puts(".");
if (!(base_flags & OTP_LOCK)) {
++addr;
if (i % 2)
++page;
} else
++page;
}
if (ret & 0x1)
printf("\nERROR at page 0x%03X (%s-halfpage): 0x%03X: %s\n",
page, lowup(i), ret, otp_strerror(ret));
else
puts(" done\n");
/* Make sure we disable writing */
set_otp_timing(false);
bfrom_OtpCommand(OTP_CLOSE, 0);
return ret;
}
U_BOOT_CMD(
otp, 7, 0, do_otp,
"One-Time-Programmable sub-system",
"read <addr> <page> [count] [half]\n"
" - read 'count' half-pages starting at 'page' (offset 'half') to 'addr'\n"
"otp dump <addr> <page> [count] [half]\n"
" - like 'otp read', but skip read errors\n"
"otp write [--force] <addr> <page> [count] [half]\n"
" - write 'count' half-pages starting at 'page' (offset 'half') from 'addr'\n"
"otp lock <page> <count>\n"
" - lock 'count' pages starting at 'page'"
);
|
