72f028ed322157623d2123b720eda881d7c2033b
[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 //config:config NANDWRITE
11 //config:       bool "nandwrite (5.9 kb)"
12 //config:       default y
13 //config:       select PLATFORM_LINUX
14 //config:       help
15 //config:       Write to the specified MTD device, with bad blocks awareness
16 //config:
17 //config:config NANDDUMP
18 //config:       bool "nanddump (6.3 kb)"
19 //config:       default y
20 //config:       select PLATFORM_LINUX
21 //config:       help
22 //config:       Dump the content of raw NAND chip
23
24 //applet:IF_NANDWRITE(APPLET(nandwrite, BB_DIR_USR_SBIN, BB_SUID_DROP))
25 //applet:IF_NANDDUMP(APPLET_ODDNAME(nanddump, nandwrite, BB_DIR_USR_SBIN, BB_SUID_DROP, nanddump))
26
27 //kbuild:lib-$(CONFIG_NANDWRITE) += nandwrite.o
28 //kbuild:lib-$(CONFIG_NANDDUMP) += nandwrite.o
29
30 //usage:#define nandwrite_trivial_usage
31 //usage:        "[-np] [-s ADDR] MTD_DEVICE [FILE]"
32 //usage:#define nandwrite_full_usage "\n\n"
33 //usage:        "Write to MTD_DEVICE\n"
34 //usage:     "\n        -n      Write without ecc"
35 //usage:     "\n        -p      Pad to page size"
36 //usage:     "\n        -s ADDR Start address"
37
38 //usage:#define nanddump_trivial_usage
39 //usage:        "[-no]" 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        -n      Read without ecc"
43 //usage:     "\n        -o      Dump oob data"
44 //usage:     "\n        -s ADDR Start address"
45 //usage:     "\n        -l LEN  Length"
46 //usage:     "\n        -f FILE Dump to file ('-' for stdout)"
47 //usage:     IF_LONG_OPTS(
48 //usage:     "\n        --bb METHOD"
49 //usage:     "\n                skipbad: skip bad blocks"
50 //usage:     "\n                padbad: substitute bad blocks by 0xff (default)"
51 //usage:     )
52
53 #include "libbb.h"
54 #include <mtd/mtd-user.h>
55
56 #define IS_NANDDUMP  (ENABLE_NANDDUMP && (!ENABLE_NANDWRITE || (applet_name[4] == 'd')))
57 #define IS_NANDWRITE (ENABLE_NANDWRITE && (!ENABLE_NANDDUMP || (applet_name[4] != 'd')))
58
59 #define OPT_p  (1 << 0) /* nandwrite only */
60 #define OPT_o  (1 << 0) /* nanddump only */
61 #define OPT_n  (1 << 1)
62 #define OPT_s  (1 << 2)
63 #define OPT_f  (1 << 3)
64 #define OPT_l  (1 << 4)
65 #define OPT_bb (1 << 5) /* must be the last one in the list */
66
67 #define BB_PADBAD (1 << 0)
68 #define BB_SKIPBAD (1 << 1)
69
70 /* helper for writing out 0xff for bad blocks pad */
71 static void dump_bad(struct mtd_info_user *meminfo, unsigned len, int oob)
72 {
73         unsigned char buf[meminfo->writesize];
74         unsigned count;
75
76         /* round len to the next page only if len is not already on a page */
77         len = ((len - 1) | (meminfo->writesize - 1)) + 1;
78
79         memset(buf, 0xff, sizeof(buf));
80         for (count = 0; count < len; count += meminfo->writesize) {
81                 xwrite(STDOUT_FILENO, buf, meminfo->writesize);
82                 if (oob)
83                         xwrite(STDOUT_FILENO, buf, meminfo->oobsize);
84         }
85 }
86
87 static unsigned next_good_eraseblock(int fd, struct mtd_info_user *meminfo,
88                 unsigned block_offset)
89 {
90         while (1) {
91                 loff_t offs;
92
93                 if (block_offset >= meminfo->size) {
94                         if (IS_NANDWRITE)
95                                 bb_error_msg_and_die("not enough space in MTD device");
96                         return block_offset; /* let the caller exit */
97                 }
98                 offs = block_offset;
99                 if (xioctl(fd, MEMGETBADBLOCK, &offs) == 0)
100                         return block_offset;
101                 /* ioctl returned 1 => "bad block" */
102                 if (IS_NANDWRITE)
103                         printf("Skipping bad block at 0x%08x\n", block_offset);
104                 block_offset += meminfo->erasesize;
105         }
106 }
107
108 int nandwrite_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
109 int nandwrite_main(int argc UNUSED_PARAM, char **argv)
110 {
111         /* Buffer for OOB data */
112         unsigned char *oobbuf;
113         unsigned opts;
114         unsigned bb_method = BB_SKIPBAD;
115         int fd;
116         ssize_t cnt;
117         unsigned mtdoffset, meminfo_writesize, blockstart, limit;
118         unsigned end_addr = ~0;
119         struct mtd_info_user meminfo;
120         struct mtd_oob_buf oob;
121         unsigned char *filebuf;
122         const char *opt_s = "0", *opt_f = "-", *opt_l, *opt_bb;
123
124         if (IS_NANDDUMP) {
125                 opts = getopt32long(argv, "^" "ons:f:l:" "\0" "=1",
126                                 "bb\0" Required_argument "\xff", /* no short equivalent */
127                                 &opt_s, &opt_f, &opt_l, &opt_bb
128                 );
129         } else { /* nandwrite */
130                 opts = getopt32(argv, "^" "pns:" "\0" "-1:?2", &opt_s);
131         }
132         argv += optind;
133
134         if (IS_NANDWRITE && argv[1])
135                 opt_f = argv[1];
136         if (!LONE_DASH(opt_f)) {
137                 int tmp_fd = xopen(opt_f,
138                         IS_NANDDUMP ? O_WRONLY | O_TRUNC | O_CREAT : O_RDONLY
139                 );
140                 xmove_fd(tmp_fd, IS_NANDDUMP ? STDOUT_FILENO : STDIN_FILENO);
141         }
142
143         fd = xopen(argv[0], IS_NANDWRITE ? O_RDWR : O_RDONLY);
144         xioctl(fd, MEMGETINFO, &meminfo);
145
146         if (opts & OPT_n)
147                 xioctl(fd, MTDFILEMODE, (void *)MTD_FILE_MODE_RAW);
148
149         mtdoffset = xstrtou(opt_s, 0);
150         if (IS_NANDDUMP && (opts & OPT_l)) {
151                 unsigned length = xstrtou(opt_l, 0);
152                 if (length < meminfo.size - mtdoffset)
153                         end_addr = mtdoffset + length;
154         }
155         if (IS_NANDDUMP && (opts & OPT_bb)) {
156                 if (strcmp("skipbad", opt_bb) == 0)
157                         bb_method = BB_SKIPBAD;
158                 else if (strcmp("padbad", opt_bb) == 0)
159                         bb_method = BB_PADBAD;
160                 else
161                         bb_show_usage();
162         }
163
164         /* Pull it into a CPU register (hopefully) - smaller code that way */
165         meminfo_writesize = meminfo.writesize;
166
167         if (mtdoffset & (meminfo_writesize - 1))
168                 bb_error_msg_and_die("start address is not page aligned");
169
170         filebuf = xmalloc(meminfo_writesize);
171         oobbuf = xmalloc(meminfo.oobsize);
172
173         oob.start  = 0;
174         oob.length = meminfo.oobsize;
175         oob.ptr    = oobbuf;
176
177         blockstart = mtdoffset & ~(meminfo.erasesize - 1);
178         if (blockstart != mtdoffset) {
179                 unsigned tmp;
180                 /* mtdoffset is in the middle of an erase block, verify that
181                  * this block is OK. Advance mtdoffset only if this block is
182                  * bad.
183                  */
184                 tmp = next_good_eraseblock(fd, &meminfo, blockstart);
185                 if (tmp != blockstart) {
186                         /* bad block(s), advance mtdoffset */
187                         if (IS_NANDDUMP) {
188                                 if (bb_method == BB_PADBAD) {
189                                         int bad_len = MIN(tmp, end_addr) - mtdoffset;
190                                         dump_bad(&meminfo, bad_len, opts & OPT_o);
191                                 }
192                                 /* with option skipbad, increase the total length */
193                                 if (bb_method == BB_SKIPBAD) {
194                                         end_addr += (tmp - blockstart);
195                                 }
196                         }
197                         mtdoffset = tmp;
198                 }
199         }
200
201         cnt = -1;
202         limit = MIN(meminfo.size, end_addr);
203         while (mtdoffset < limit) {
204                 int input_fd = IS_NANDWRITE ? STDIN_FILENO : fd;
205                 int output_fd = IS_NANDWRITE ? fd : STDOUT_FILENO;
206
207                 blockstart = mtdoffset & ~(meminfo.erasesize - 1);
208                 if (blockstart == mtdoffset) {
209                         /* starting a new eraseblock */
210                         mtdoffset = next_good_eraseblock(fd, &meminfo, blockstart);
211                         if (IS_NANDWRITE)
212                                 printf("Writing at 0x%08x\n", mtdoffset);
213                         else if (mtdoffset > blockstart) {
214                                 if (bb_method == BB_PADBAD) {
215                                         /* dump FF padded bad block */
216                                         int bad_len = MIN(mtdoffset, limit) - blockstart;
217                                         dump_bad(&meminfo, bad_len, opts & OPT_o);
218                                 } else if (bb_method == BB_SKIPBAD) {
219                                         /* for skipbad, increase the length */
220                                         if ((end_addr + mtdoffset - blockstart) > end_addr)
221                                                 end_addr += (mtdoffset - blockstart);
222                                         else
223                                                 end_addr = ~0;
224                                         limit = MIN(meminfo.size, end_addr);
225                                 }
226                         }
227                         if (mtdoffset >= limit)
228                                 break;
229                 }
230                 xlseek(fd, mtdoffset, SEEK_SET);
231
232                 /* get some more data from input */
233                 cnt = full_read(input_fd, filebuf, meminfo_writesize);
234                 if (cnt == 0) {
235                         /* even with -p, we do not pad past the end of input
236                          * (-p only zero-pads last incomplete page)
237                          */
238                         break;
239                 }
240                 if (cnt < meminfo_writesize) {
241                         if (IS_NANDDUMP)
242                                 bb_error_msg_and_die("short read");
243                         if (!(opts & OPT_p))
244                                 bb_error_msg_and_die("input size is not rounded up to page size, "
245                                                 "use -p to zero pad");
246                         /* zero pad to end of write block */
247                         memset(filebuf + cnt, 0, meminfo_writesize - cnt);
248                 }
249                 xwrite(output_fd, filebuf, meminfo_writesize);
250
251                 if (IS_NANDDUMP && (opts & OPT_o)) {
252                         /* Dump OOB data */
253                         oob.start = mtdoffset;
254                         xioctl(fd, MEMREADOOB, &oob);
255                         xwrite(output_fd, oobbuf, meminfo.oobsize);
256                 }
257
258                 mtdoffset += meminfo_writesize;
259                 if (cnt < meminfo_writesize)
260                         break;
261         }
262
263         if (IS_NANDWRITE && cnt != 0) {
264                 /* We filled entire MTD, but did we reach EOF on input? */
265                 if (full_read(STDIN_FILENO, filebuf, meminfo_writesize) != 0) {
266                         /* no */
267                         bb_error_msg_and_die("not enough space in MTD device");
268                 }
269         }
270
271         if (ENABLE_FEATURE_CLEAN_UP) {
272                 free(filebuf);
273                 close(fd);
274         }
275
276         return EXIT_SUCCESS;
277 }