mtd: Fix typo mtd/tests
[linux-3.10.git] / drivers / mtd / tests / mtd_readtest.c
1 /*
2  * Copyright (C) 2006-2008 Nokia Corporation
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms of the GNU General Public License version 2 as published by
6  * the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful, but WITHOUT
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11  * more details.
12  *
13  * You should have received a copy of the GNU General Public License along with
14  * this program; see the file COPYING. If not, write to the Free Software
15  * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
16  *
17  * Check MTD device read.
18  *
19  * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
20  */
21
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24 #include <linux/init.h>
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27 #include <linux/err.h>
28 #include <linux/mtd/mtd.h>
29 #include <linux/slab.h>
30 #include <linux/sched.h>
31
32 static int dev = -EINVAL;
33 module_param(dev, int, S_IRUGO);
34 MODULE_PARM_DESC(dev, "MTD device number to use");
35
36 static struct mtd_info *mtd;
37 static unsigned char *iobuf;
38 static unsigned char *iobuf1;
39 static unsigned char *bbt;
40
41 static int pgsize;
42 static int ebcnt;
43 static int pgcnt;
44
45 static int read_eraseblock_by_page(int ebnum)
46 {
47         size_t read;
48         int i, ret, err = 0;
49         loff_t addr = ebnum * mtd->erasesize;
50         void *buf = iobuf;
51         void *oobbuf = iobuf1;
52
53         for (i = 0; i < pgcnt; i++) {
54                 memset(buf, 0 , pgcnt);
55                 ret = mtd_read(mtd, addr, pgsize, &read, buf);
56                 if (ret == -EUCLEAN)
57                         ret = 0;
58                 if (ret || read != pgsize) {
59                         pr_err("error: read failed at %#llx\n",
60                                (long long)addr);
61                         if (!err)
62                                 err = ret;
63                         if (!err)
64                                 err = -EINVAL;
65                 }
66                 if (mtd->oobsize) {
67                         struct mtd_oob_ops ops;
68
69                         ops.mode      = MTD_OPS_PLACE_OOB;
70                         ops.len       = 0;
71                         ops.retlen    = 0;
72                         ops.ooblen    = mtd->oobsize;
73                         ops.oobretlen = 0;
74                         ops.ooboffs   = 0;
75                         ops.datbuf    = NULL;
76                         ops.oobbuf    = oobbuf;
77                         ret = mtd_read_oob(mtd, addr, &ops);
78                         if ((ret && !mtd_is_bitflip(ret)) ||
79                                         ops.oobretlen != mtd->oobsize) {
80                                 pr_err("error: read oob failed at "
81                                                   "%#llx\n", (long long)addr);
82                                 if (!err)
83                                         err = ret;
84                                 if (!err)
85                                         err = -EINVAL;
86                         }
87                         oobbuf += mtd->oobsize;
88                 }
89                 addr += pgsize;
90                 buf += pgsize;
91         }
92
93         return err;
94 }
95
96 static void dump_eraseblock(int ebnum)
97 {
98         int i, j, n;
99         char line[128];
100         int pg, oob;
101
102         pr_info("dumping eraseblock %d\n", ebnum);
103         n = mtd->erasesize;
104         for (i = 0; i < n;) {
105                 char *p = line;
106
107                 p += sprintf(p, "%05x: ", i);
108                 for (j = 0; j < 32 && i < n; j++, i++)
109                         p += sprintf(p, "%02x", (unsigned int)iobuf[i]);
110                 printk(KERN_CRIT "%s\n", line);
111                 cond_resched();
112         }
113         if (!mtd->oobsize)
114                 return;
115         pr_info("dumping oob from eraseblock %d\n", ebnum);
116         n = mtd->oobsize;
117         for (pg = 0, i = 0; pg < pgcnt; pg++)
118                 for (oob = 0; oob < n;) {
119                         char *p = line;
120
121                         p += sprintf(p, "%05x: ", i);
122                         for (j = 0; j < 32 && oob < n; j++, oob++, i++)
123                                 p += sprintf(p, "%02x",
124                                              (unsigned int)iobuf1[i]);
125                         printk(KERN_CRIT "%s\n", line);
126                         cond_resched();
127                 }
128 }
129
130 static int is_block_bad(int ebnum)
131 {
132         loff_t addr = ebnum * mtd->erasesize;
133         int ret;
134
135         ret = mtd_block_isbad(mtd, addr);
136         if (ret)
137                 pr_info("block %d is bad\n", ebnum);
138         return ret;
139 }
140
141 static int scan_for_bad_eraseblocks(void)
142 {
143         int i, bad = 0;
144
145         bbt = kzalloc(ebcnt, GFP_KERNEL);
146         if (!bbt) {
147                 pr_err("error: cannot allocate memory\n");
148                 return -ENOMEM;
149         }
150
151         if (!mtd_can_have_bb(mtd))
152                 return 0;
153
154         pr_info("scanning for bad eraseblocks\n");
155         for (i = 0; i < ebcnt; ++i) {
156                 bbt[i] = is_block_bad(i) ? 1 : 0;
157                 if (bbt[i])
158                         bad += 1;
159                 cond_resched();
160         }
161         pr_info("scanned %d eraseblocks, %d are bad\n", i, bad);
162         return 0;
163 }
164
165 static int __init mtd_readtest_init(void)
166 {
167         uint64_t tmp;
168         int err, i;
169
170         printk(KERN_INFO "\n");
171         printk(KERN_INFO "=================================================\n");
172
173         if (dev < 0) {
174                 pr_info("Please specify a valid mtd-device via module parameter\n");
175                 return -EINVAL;
176         }
177
178         pr_info("MTD device: %d\n", dev);
179
180         mtd = get_mtd_device(NULL, dev);
181         if (IS_ERR(mtd)) {
182                 err = PTR_ERR(mtd);
183                 pr_err("error: Cannot get MTD device\n");
184                 return err;
185         }
186
187         if (mtd->writesize == 1) {
188                 pr_info("not NAND flash, assume page size is 512 "
189                        "bytes.\n");
190                 pgsize = 512;
191         } else
192                 pgsize = mtd->writesize;
193
194         tmp = mtd->size;
195         do_div(tmp, mtd->erasesize);
196         ebcnt = tmp;
197         pgcnt = mtd->erasesize / pgsize;
198
199         pr_info("MTD device size %llu, eraseblock size %u, "
200                "page size %u, count of eraseblocks %u, pages per "
201                "eraseblock %u, OOB size %u\n",
202                (unsigned long long)mtd->size, mtd->erasesize,
203                pgsize, ebcnt, pgcnt, mtd->oobsize);
204
205         err = -ENOMEM;
206         iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
207         if (!iobuf) {
208                 pr_err("error: cannot allocate memory\n");
209                 goto out;
210         }
211         iobuf1 = kmalloc(mtd->erasesize, GFP_KERNEL);
212         if (!iobuf1) {
213                 pr_err("error: cannot allocate memory\n");
214                 goto out;
215         }
216
217         err = scan_for_bad_eraseblocks();
218         if (err)
219                 goto out;
220
221         /* Read all eraseblocks 1 page at a time */
222         pr_info("testing page read\n");
223         for (i = 0; i < ebcnt; ++i) {
224                 int ret;
225
226                 if (bbt[i])
227                         continue;
228                 ret = read_eraseblock_by_page(i);
229                 if (ret) {
230                         dump_eraseblock(i);
231                         if (!err)
232                                 err = ret;
233                 }
234                 cond_resched();
235         }
236
237         if (err)
238                 pr_info("finished with errors\n");
239         else
240                 pr_info("finished\n");
241
242 out:
243
244         kfree(iobuf);
245         kfree(iobuf1);
246         kfree(bbt);
247         put_mtd_device(mtd);
248         if (err)
249                 pr_info("error %d occurred\n", err);
250         printk(KERN_INFO "=================================================\n");
251         return err;
252 }
253 module_init(mtd_readtest_init);
254
255 static void __exit mtd_readtest_exit(void)
256 {
257         return;
258 }
259 module_exit(mtd_readtest_exit);
260
261 MODULE_DESCRIPTION("Read test module");
262 MODULE_AUTHOR("Adrian Hunter");
263 MODULE_LICENSE("GPL");