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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         char *cmd;
86         uint32_t ret, base_flags;
87         bool prompt_user, force_read;
88         uint32_t (*otp_func)(uint32_t page, uint32_t flags, uint64_t *page_content);
89
90         if (argc < 4) {
91  usage:
92                 return CMD_RET_USAGE;
93         }
94
95         prompt_user = false;
96         base_flags = 0;
97         cmd = argv[1];
98         if (!strcmp(cmd, "read"))
99                 otp_func = bfrom_OtpRead;
100         else if (!strcmp(cmd, "dump")) {
101                 otp_func = bfrom_OtpRead;
102                 force_read = true;
103         } else if (!strcmp(cmd, "write")) {
104                 otp_func = bfrom_OtpWrite;
105                 base_flags = OTP_CHECK_FOR_PREV_WRITE;
106                 if (!strcmp(argv[2], "--force")) {
107                         argv++;
108                         --argc;
109                 } else
110                         prompt_user = false;
111         } else if (!strcmp(cmd, "lock")) {
112                 if (argc != 4)
113                         goto usage;
114                 otp_func = bfrom_OtpWrite;
115                 base_flags = OTP_LOCK;
116         } else
117                 goto usage;
118
119         uint64_t *addr = (uint64_t *)simple_strtoul(argv[2], NULL, 16);
120         uint32_t page = simple_strtoul(argv[3], NULL, 16);
121         uint32_t flags;
122         size_t i, count;
123         ulong half;
124
125         if (argc > 4)
126                 count = simple_strtoul(argv[4], NULL, 16);
127         else
128                 count = 2;
129
130         if (argc > 5) {
131                 half = simple_strtoul(argv[5], NULL, 16);
132                 if (half != 0 && half != 1) {
133                         puts("Error: 'half' can only be '0' or '1'\n");
134                         goto usage;
135                 }
136         } else
137                 half = 0;
138
139         /* "otp lock" has slightly different semantics */
140         if (base_flags & OTP_LOCK) {
141                 count = page;
142                 page = (uint32_t)addr;
143                 addr = NULL;
144         }
145
146         /* do to the nature of OTP, make sure users are sure */
147         if (prompt_user) {
148                 printf(
149                         "Writing one time programmable memory\n"
150                         "Make sure your operating voltages and temperature are within spec\n"
151                         "   source address:  0x%p\n"
152                         "   OTP destination: %s page 0x%03X - %s page 0x%03lX\n"
153                         "   number to write: %lu halfpages\n"
154                         " type \"YES\" (no quotes) to confirm: ",
155                         addr,
156                         lowup(half), page,
157                         lowup(half + count - 1), page + (half + count - 1) / 2,
158                         half + count
159                 );
160
161                 i = 0;
162                 while (1) {
163                         if (tstc()) {
164                                 const char exp_ans[] = "YES\r";
165                                 char c;
166                                 putc(c = getc());
167                                 if (exp_ans[i++] != c) {
168                                         printf(" Aborting\n");
169                                         return 1;
170                                 } else if (!exp_ans[i]) {
171                                         puts("\n");
172                                         break;
173                                 }
174                         }
175                 }
176         }
177
178         printf("OTP memory %s: addr 0x%p  page 0x%03X  count %zu ... ",
179                 cmd, addr, page, count);
180
181         set_otp_timing(otp_func == bfrom_OtpWrite);
182         if (otp_func == bfrom_OtpWrite && check_voltage()) {
183                 puts("ERROR: VDDINT voltage is out of spec for writing\n");
184                 return -1;
185         }
186
187         /* Do the actual reading/writing stuff */
188         ret = 0;
189         for (i = half; i < count + half; ++i) {
190                 flags = base_flags | (i % 2 ? OTP_UPPER_HALF : OTP_LOWER_HALF);
191  try_again:
192                 ret = otp_func(page, flags, addr);
193                 if (ret & OTP_MASTER_ERROR) {
194                         if (force_read) {
195                                 if (flags & OTP_NO_ECC)
196                                         break;
197                                 else
198                                         flags |= OTP_NO_ECC;
199                                 puts("E");
200                                 goto try_again;
201                         } else
202                                 break;
203                 } else if (ret)
204                         puts("W");
205                 else
206                         puts(".");
207                 if (!(base_flags & OTP_LOCK)) {
208                         ++addr;
209                         if (i % 2)
210                                 ++page;
211                 } else
212                         ++page;
213         }
214         if (ret & 0x1)
215                 printf("\nERROR at page 0x%03X (%s-halfpage): 0x%03X: %s\n",
216                         page, lowup(i), ret, otp_strerror(ret));
217         else
218                 puts(" done\n");
219
220         /* Make sure we disable writing */
221         set_otp_timing(false);
222         bfrom_OtpCommand(OTP_CLOSE, 0);
223
224         return ret;
225 }
226
227 U_BOOT_CMD(
228         otp, 7, 0, do_otp,
229         "One-Time-Programmable sub-system",
230         "read <addr> <page> [count] [half]\n"
231         " - read 'count' half-pages starting at 'page' (offset 'half') to 'addr'\n"
232         "otp dump <addr> <page> [count] [half]\n"
233         " - like 'otp read', but skip read errors\n"
234         "otp write [--force] <addr> <page> [count] [half]\n"
235         " - write 'count' half-pages starting at 'page' (offset 'half') from 'addr'\n"
236         "otp lock <page> <count>\n"
237         " - lock 'count' pages starting at 'page'"
238 );