i2cdump: don't read block data in non-block modes
[oweals/busybox.git] / miscutils / nandwrite.c
1 /*
2  * nandwrite and nanddump ported to busybox from mtd-utils
3  *
4  * Author: Baruch Siach <baruch@tkos.co.il>, Orex Computed Radiography
5  *
6  * Licensed under GPLv2, see file LICENSE in this source tree.
7  *
8  * TODO: add support for large (>4GB) MTD devices
9  */
10
11 //config:config NANDWRITE
12 //config:       bool "nandwrite"
13 //config:       default y
14 //config:       select PLATFORM_LINUX
15 //config:       help
16 //config:         Write to the specified MTD device, with bad blocks awareness
17 //config:
18 //config:config NANDDUMP
19 //config:       bool "nanddump"
20 //config:       default y
21 //config:       select PLATFORM_LINUX
22 //config:       help
23 //config:         Dump the content of raw NAND chip
24
25 //applet:IF_NANDWRITE(APPLET(nandwrite, BB_DIR_USR_SBIN, BB_SUID_DROP))
26 //applet:IF_NANDDUMP(APPLET_ODDNAME(nanddump, nandwrite, BB_DIR_USR_SBIN, BB_SUID_DROP, nanddump))
27
28 //kbuild:lib-$(CONFIG_NANDWRITE) += nandwrite.o
29 //kbuild:lib-$(CONFIG_NANDDUMP) += nandwrite.o
30
31 //usage:#define nandwrite_trivial_usage
32 //usage:        "[-p] [-s ADDR] MTD_DEVICE [FILE]"
33 //usage:#define nandwrite_full_usage "\n\n"
34 //usage:        "Write to MTD_DEVICE\n"
35 //usage:     "\n        -p      Pad to page size"
36 //usage:     "\n        -s ADDR Start address"
37
38 //usage:#define nanddump_trivial_usage
39 //usage:        "[-o]" IF_LONG_OPTS(" [--bb=padbad|skipbad]") " [-s ADDR] [-l LEN] [-f FILE] MTD_DEVICE"
40 //usage:#define nanddump_full_usage "\n\n"
41 //usage:        "Dump MTD_DEVICE\n"
42 //usage:     "\n        -o      Dump oob data"
43 //usage:     "\n        -s ADDR Start address"
44 //usage:     "\n        -l LEN  Length"
45 //usage:     "\n        -f FILE Dump to file ('-' for stdout)"
46 //usage:     IF_LONG_OPTS(
47 //usage:     "\n        --bb=METHOD:"
48 //usage:     "\n                skipbad: skip bad blocks"
49 //usage:     "\n                padbad: substitute bad blocks by 0xff (default)"
50 //usage:     )
51
52 #include "libbb.h"
53 #include <mtd/mtd-user.h>
54
55 #define IS_NANDDUMP  (ENABLE_NANDDUMP && (!ENABLE_NANDWRITE || (applet_name[4] == 'd')))
56 #define IS_NANDWRITE (ENABLE_NANDWRITE && (!ENABLE_NANDDUMP || (applet_name[4] != 'd')))
57
58 #define OPT_p  (1 << 0) /* nandwrite only */
59 #define OPT_o  (1 << 0) /* nanddump only */
60 #define OPT_s  (1 << 1)
61 #define OPT_f  (1 << 2)
62 #define OPT_l  (1 << 3)
63 #define OPT_bb (1 << 4) /* must be the last one in the list */
64
65 #define BB_PADBAD (1 << 0)
66 #define BB_SKIPBAD (1 << 1)
67
68 /* helper for writing out 0xff for bad blocks pad */
69 static void dump_bad(struct mtd_info_user *meminfo, unsigned len, int oob)
70 {
71         unsigned char buf[meminfo->writesize];
72         unsigned count;
73
74         /* round len to the next page only if len is not already on a page */
75         len = ((len - 1) | (meminfo->writesize - 1)) + 1;
76
77         memset(buf, 0xff, sizeof(buf));
78         for (count = 0; count < len; count += meminfo->writesize) {
79                 xwrite(STDOUT_FILENO, buf, meminfo->writesize);
80                 if (oob)
81                         xwrite(STDOUT_FILENO, buf, meminfo->oobsize);
82         }
83 }
84
85 static unsigned next_good_eraseblock(int fd, struct mtd_info_user *meminfo,
86                 unsigned block_offset)
87 {
88         while (1) {
89                 loff_t offs;
90
91                 if (block_offset >= meminfo->size) {
92                         if (IS_NANDWRITE)
93                                 bb_error_msg_and_die("not enough space in MTD device");
94                         return block_offset; /* let the caller exit */
95                 }
96                 offs = block_offset;
97                 if (xioctl(fd, MEMGETBADBLOCK, &offs) == 0)
98                         return block_offset;
99                 /* ioctl returned 1 => "bad block" */
100                 if (IS_NANDWRITE)
101                         printf("Skipping bad block at 0x%08x\n", block_offset);
102                 block_offset += meminfo->erasesize;
103         }
104 }
105
106 int nandwrite_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
107 int nandwrite_main(int argc UNUSED_PARAM, char **argv)
108 {
109         /* Buffer for OOB data */
110         unsigned char *oobbuf;
111         unsigned opts;
112         unsigned bb_method = BB_SKIPBAD;
113         int fd;
114         ssize_t cnt;
115         unsigned mtdoffset, meminfo_writesize, blockstart, limit;
116         unsigned end_addr = ~0;
117         struct mtd_info_user meminfo;
118         struct mtd_oob_buf oob;
119         unsigned char *filebuf;
120         const char *opt_s = "0", *opt_f = "-", *opt_l, *opt_bb;
121
122         if (IS_NANDDUMP) {
123                 opt_complementary = "=1";
124 #if ENABLE_LONG_OPTS
125                 applet_long_options =
126                         "bb\0" Required_argument "\xff"; /* no short equivalent */
127 #endif
128                 opts = getopt32(argv, "os:f:l:", &opt_s, &opt_f, &opt_l, &opt_bb);
129         } else { /* nandwrite */
130                 opt_complementary = "-1:?2";
131                 opts = getopt32(argv, "ps:", &opt_s);
132         }
133         argv += optind;
134
135         if (IS_NANDWRITE && argv[1])
136                 opt_f = argv[1];
137         if (!LONE_DASH(opt_f)) {
138                 int tmp_fd = xopen(opt_f,
139                         IS_NANDDUMP ? O_WRONLY | O_TRUNC | O_CREAT : O_RDONLY
140                 );
141                 xmove_fd(tmp_fd, IS_NANDDUMP ? STDOUT_FILENO : STDIN_FILENO);
142         }
143
144         fd = xopen(argv[0], IS_NANDWRITE ? O_RDWR : O_RDONLY);
145         xioctl(fd, MEMGETINFO, &meminfo);
146
147         mtdoffset = xstrtou(opt_s, 0);
148         if (IS_NANDDUMP && (opts & OPT_l)) {
149                 unsigned length = xstrtou(opt_l, 0);
150                 if (length < meminfo.size - mtdoffset)
151                         end_addr = mtdoffset + length;
152         }
153         if (IS_NANDDUMP && (opts & OPT_bb)) {
154                 if (strcmp("skipbad", opt_bb) == 0)
155                         bb_method = BB_SKIPBAD;
156                 else if (strcmp("padbad", opt_bb) == 0)
157                         bb_method = BB_PADBAD;
158                 else
159                         bb_show_usage();
160         }
161
162         /* Pull it into a CPU register (hopefully) - smaller code that way */
163         meminfo_writesize = meminfo.writesize;
164
165         if (mtdoffset & (meminfo_writesize - 1))
166                 bb_error_msg_and_die("start address is not page aligned");
167
168         filebuf = xmalloc(meminfo_writesize);
169         oobbuf = xmalloc(meminfo.oobsize);
170
171         oob.start  = 0;
172         oob.length = meminfo.oobsize;
173         oob.ptr    = oobbuf;
174
175         blockstart = mtdoffset & ~(meminfo.erasesize - 1);
176         if (blockstart != mtdoffset) {
177                 unsigned tmp;
178                 /* mtdoffset is in the middle of an erase block, verify that
179                  * this block is OK. Advance mtdoffset only if this block is
180                  * bad.
181                  */
182                 tmp = next_good_eraseblock(fd, &meminfo, blockstart);
183                 if (tmp != blockstart) {
184                         /* bad block(s), advance mtdoffset */
185                         if (IS_NANDDUMP) {
186                                 if (bb_method == BB_PADBAD) {
187                                         int bad_len = MIN(tmp, end_addr) - mtdoffset;
188                                         dump_bad(&meminfo, bad_len, opts & OPT_o);
189                                 }
190                                 /* with option skipbad, increase the total length */
191                                 if (bb_method == BB_SKIPBAD) {
192                                         end_addr += (tmp - blockstart);
193                                 }
194                         }
195                         mtdoffset = tmp;
196                 }
197         }
198
199         cnt = -1;
200         limit = MIN(meminfo.size, end_addr);
201         while (mtdoffset < limit) {
202                 int input_fd = IS_NANDWRITE ? STDIN_FILENO : fd;
203                 int output_fd = IS_NANDWRITE ? fd : STDOUT_FILENO;
204
205                 blockstart = mtdoffset & ~(meminfo.erasesize - 1);
206                 if (blockstart == mtdoffset) {
207                         /* starting a new eraseblock */
208                         mtdoffset = next_good_eraseblock(fd, &meminfo, blockstart);
209                         if (IS_NANDWRITE)
210                                 printf("Writing at 0x%08x\n", mtdoffset);
211                         else if (mtdoffset > blockstart) {
212                                 if (bb_method == BB_PADBAD) {
213                                         /* dump FF padded bad block */
214                                         int bad_len = MIN(mtdoffset, limit) - blockstart;
215                                         dump_bad(&meminfo, bad_len, opts & OPT_o);
216                                 } else if (bb_method == BB_SKIPBAD) {
217                                         /* for skipbad, increase the length */
218                                         if ((end_addr + mtdoffset - blockstart) > end_addr)
219                                                 end_addr += (mtdoffset - blockstart);
220                                         else
221                                                 end_addr = ~0;
222                                         limit = MIN(meminfo.size, end_addr);
223                                 }
224                         }
225                         if (mtdoffset >= limit)
226                                 break;
227                 }
228                 xlseek(fd, mtdoffset, SEEK_SET);
229
230                 /* get some more data from input */
231                 cnt = full_read(input_fd, filebuf, meminfo_writesize);
232                 if (cnt == 0) {
233                         /* even with -p, we do not pad past the end of input
234                          * (-p only zero-pads last incomplete page)
235                          */
236                         break;
237                 }
238                 if (cnt < meminfo_writesize) {
239                         if (IS_NANDDUMP)
240                                 bb_error_msg_and_die("short read");
241                         if (!(opts & OPT_p))
242                                 bb_error_msg_and_die("input size is not rounded up to page size, "
243                                                 "use -p to zero pad");
244                         /* zero pad to end of write block */
245                         memset(filebuf + cnt, 0, meminfo_writesize - cnt);
246                 }
247                 xwrite(output_fd, filebuf, meminfo_writesize);
248
249                 if (IS_NANDDUMP && (opts & OPT_o)) {
250                         /* Dump OOB data */
251                         oob.start = mtdoffset;
252                         xioctl(fd, MEMREADOOB, &oob);
253                         xwrite(output_fd, oobbuf, meminfo.oobsize);
254                 }
255
256                 mtdoffset += meminfo_writesize;
257                 if (cnt < meminfo_writesize)
258                         break;
259         }
260
261         if (IS_NANDWRITE && cnt != 0) {
262                 /* We filled entire MTD, but did we reach EOF on input? */
263                 if (full_read(STDIN_FILENO, filebuf, meminfo_writesize) != 0) {
264                         /* no */
265                         bb_error_msg_and_die("not enough space in MTD device");
266                 }
267         }
268
269         if (ENABLE_FEATURE_CLEAN_UP) {
270                 free(filebuf);
271                 close(fd);
272         }
273
274         return EXIT_SUCCESS;
275 }