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[u-boot] / common / cmd_otp.c
1 /*
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 through 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 #include <asm/blackfin.h>
21 #include <asm/mach-common/bits/otp.h>
22
23 static const char *otp_strerror(uint32_t err)
24 {
25         switch (err) {
26         case 0:                   return "no error";
27         case OTP_WRITE_ERROR:     return "OTP fuse write error";
28         case OTP_READ_ERROR:      return "OTP fuse read error";
29         case OTP_ACC_VIO_ERROR:   return "invalid OTP address";
30         case OTP_DATA_MULT_ERROR: return "multiple bad bits detected";
31         case OTP_ECC_MULT_ERROR:  return "error in ECC bits";
32         case OTP_PREV_WR_ERROR:   return "space already written";
33         case OTP_DATA_SB_WARN:    return "single bad bit in half page";
34         case OTP_ECC_SB_WARN:     return "single bad bit in ECC";
35         default:                  return "unknown error";
36         }
37 }
38
39 #define lowup(x) ((x) % 2 ? "upper" : "lower")
40
41 static int check_voltage(void)
42 {
43         /* Make sure voltage limits are within datasheet spec */
44         uint16_t vr_ctl = bfin_read_VR_CTL();
45
46 #ifdef __ADSPBF54x__
47         /* 0.9V <= VDDINT <= 1.1V */
48         if ((vr_ctl & 0xc) && (vr_ctl & 0xc0) == 0xc0)
49                 return 1;
50 #else
51         /* for the parts w/out qualification yet */
52         (void)vr_ctl;
53 #endif
54
55         return 0;
56 }
57
58 static void set_otp_timing(bool write)
59 {
60         static uint32_t timing;
61         if (!timing) {
62                 uint32_t tp1, tp2, tp3;
63                 /* OTP_TP1 = 1000 / sclk_period (in nanoseconds)
64                  * OTP_TP1 = 1000 / (1 / get_sclk() * 10^9)
65                  * OTP_TP1 = (1000 * get_sclk()) / 10^9
66                  * OTP_TP1 = get_sclk() / 10^6
67                  */
68                 tp1 = get_sclk() / 1000000;
69                 /* OTP_TP2 = 400 / (2 * sclk_period)
70                  * OTP_TP2 = 400 / (2 * 1 / get_sclk() * 10^9)
71                  * OTP_TP2 = (400 * get_sclk()) / (2 * 10^9)
72                  * OTP_TP2 = (2 * get_sclk()) / 10^7
73                  */
74                 tp2 = (2 * get_sclk() / 10000000) << 8;
75                 /* OTP_TP3 = magic constant */
76                 tp3 = (0x1401) << 15;
77                 timing = tp1 | tp2 | tp3;
78         }
79
80         bfrom_OtpCommand(OTP_INIT, write ? timing : timing & ~(-1 << 15));
81 }
82
83 int do_otp(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
84 {
85         uint32_t ret, base_flags;
86         bool prompt_user, force_read;
87         uint32_t (*otp_func)(uint32_t page, uint32_t flags, uint64_t *page_content);
88
89         if (argc < 4) {
90  usage:
91                 return cmd_usage(cmdtp);
92         }
93
94         prompt_user = false;
95         base_flags = 0;
96         if (!strcmp(argv[1], "read"))
97                 otp_func = bfrom_OtpRead;
98         else if (!strcmp(argv[1], "dump")) {
99                 otp_func = bfrom_OtpRead;
100                 force_read = true;
101         } else if (!strcmp(argv[1], "write")) {
102                 otp_func = bfrom_OtpWrite;
103                 base_flags = OTP_CHECK_FOR_PREV_WRITE;
104                 if (!strcmp(argv[2], "--force")) {
105                         argv[2] = argv[1];
106                         argv++;
107                         --argc;
108                 } else
109                         prompt_user = false;
110         } else if (!strcmp(argv[1], "lock")) {
111                 if (argc != 4)
112                         goto usage;
113                 otp_func = bfrom_OtpWrite;
114                 base_flags = OTP_LOCK;
115         } else
116                 goto usage;
117
118         uint64_t *addr = (uint64_t *)simple_strtoul(argv[2], NULL, 16);
119         uint32_t page = simple_strtoul(argv[3], NULL, 16);
120         uint32_t flags;
121         size_t i, count;
122         ulong half;
123
124         if (argc > 4)
125                 count = simple_strtoul(argv[4], NULL, 16);
126         else
127                 count = 2;
128
129         if (argc > 5) {
130                 half = simple_strtoul(argv[5], NULL, 16);
131                 if (half != 0 && half != 1) {
132                         puts("Error: 'half' can only be '0' or '1'\n");
133                         goto usage;
134                 }
135         } else
136                 half = 0;
137
138         /* "otp lock" has slightly different semantics */
139         if (base_flags & OTP_LOCK) {
140                 count = page;
141                 page = (uint32_t)addr;
142                 addr = NULL;
143         }
144
145         /* do to the nature of OTP, make sure users are sure */
146         if (prompt_user) {
147                 printf(
148                         "Writing one time programmable memory\n"
149                         "Make sure your operating voltages and temperature are within spec\n"
150                         "   source address:  0x%p\n"
151                         "   OTP destination: %s page 0x%03X - %s page 0x%03lX\n"
152                         "   number to write: %lu halfpages\n"
153                         " type \"YES\" (no quotes) to confirm: ",
154                         addr,
155                         lowup(half), page,
156                         lowup(half + count - 1), page + (half + count - 1) / 2,
157                         half + count
158                 );
159
160                 i = 0;
161                 while (1) {
162                         if (tstc()) {
163                                 const char exp_ans[] = "YES\r";
164                                 char c;
165                                 putc(c = getc());
166                                 if (exp_ans[i++] != c) {
167                                         printf(" Aborting\n");
168                                         return 1;
169                                 } else if (!exp_ans[i]) {
170                                         puts("\n");
171                                         break;
172                                 }
173                         }
174                 }
175         }
176
177         printf("OTP memory %s: addr 0x%p  page 0x%03X  count %zu ... ",
178                 argv[1], addr, page, count);
179
180         set_otp_timing(otp_func == bfrom_OtpWrite);
181         if (otp_func == bfrom_OtpWrite && check_voltage()) {
182                 puts("ERROR: VDDINT voltage is out of spec for writing\n");
183                 return -1;
184         }
185
186         /* Do the actual reading/writing stuff */
187         ret = 0;
188         for (i = half; i < count + half; ++i) {
189                 flags = base_flags | (i % 2 ? OTP_UPPER_HALF : OTP_LOWER_HALF);
190  try_again:
191                 ret = otp_func(page, flags, addr);
192                 if (ret & OTP_MASTER_ERROR) {
193                         if (force_read) {
194                                 if (flags & OTP_NO_ECC)
195                                         break;
196                                 else
197                                         flags |= OTP_NO_ECC;
198                                 puts("E");
199                                 goto try_again;
200                         } else
201                                 break;
202                 } else if (ret)
203                         puts("W");
204                 else
205                         puts(".");
206                 if (!(base_flags & OTP_LOCK)) {
207                         ++addr;
208                         if (i % 2)
209                                 ++page;
210                 } else
211                         ++page;
212         }
213         if (ret & 0x1)
214                 printf("\nERROR at page 0x%03X (%s-halfpage): 0x%03X: %s\n",
215                         page, lowup(i), ret, otp_strerror(ret));
216         else
217                 puts(" done\n");
218
219         /* Make sure we disable writing */
220         set_otp_timing(false);
221         bfrom_OtpCommand(OTP_CLOSE, 0);
222
223         return ret;
224 }
225
226 U_BOOT_CMD(
227         otp, 7, 0, do_otp,
228         "One-Time-Programmable sub-system",
229         "read <addr> <page> [count] [half]\n"
230         " - read 'count' half-pages starting at 'page' (offset 'half') to 'addr'\n"
231         "otp dump <addr> <page> [count] [half]\n"
232         " - like 'otp read', but skip read errors\n"
233         "otp write [--force] <addr> <page> [count] [half]\n"
234         " - write 'count' half-pages starting at 'page' (offset 'half') from 'addr'\n"
235         "otp lock <page> <count>\n"
236         " - lock 'count' pages starting at 'page'"
237 );