LXR linux/drivers/mtd/tests/mtd

   1#define pr_fmt(fmt) "mtd_test: " fmt
   2
   3#include <linux/module.h>
   4#include <linux/sched.h>
   5#include <linux/printk.h>
   6
   7#include "mtd_test.h"
   8
   9int mtdtest_erase_eraseblock(struct mtd_info *mtd, unsigned int ebnum)
  10{
  11        int err;
  12        struct erase_info ei;
  13        loff_t addr = (loff_t)ebnum * mtd->erasesize;
  14
  15        memset(&ei, 0, sizeof(struct erase_info));
  16        ei.mtd  = mtd;
  17        ei.addr = addr;
  18        ei.len  = mtd->erasesize;
  19
  20        err = mtd_erase(mtd, &ei);
  21        if (err) {
  22                pr_info("error %d while erasing EB %d\n", err, ebnum);
  23                return err;
  24        }
  25
  26        if (ei.state == MTD_ERASE_FAILED) {
  27                pr_info("some erase error occurred at EB %d\n", ebnum);
  28                return -EIO;
  29        }
  30        return 0;
  31}
  32
  33static int is_block_bad(struct mtd_info *mtd, unsigned int ebnum)
  34{
  35        int ret;
  36        loff_t addr = (loff_t)ebnum * mtd->erasesize;
  37
  38        ret = mtd_block_isbad(mtd, addr);
  39        if (ret)
  40                pr_info("block %d is bad\n", ebnum);
  41
  42        return ret;
  43}
  44
  45int mtdtest_scan_for_bad_eraseblocks(struct mtd_info *mtd, unsigned char *bbt,
  46                                        unsigned int eb, int ebcnt)
  47{
  48        int i, bad = 0;
  49
  50        if (!mtd_can_have_bb(mtd))
  51                return 0;
  52
  53        pr_info("scanning for bad eraseblocks\n");
  54        for (i = 0; i < ebcnt; ++i) {
  55                bbt[i] = is_block_bad(mtd, eb + i) ? 1 : 0;
  56                if (bbt[i])
  57                        bad += 1;
  58                cond_resched();
  59        }
  60        pr_info("scanned %d eraseblocks, %d are bad\n", i, bad);
  61
  62        return 0;
  63}
  64
  65int mtdtest_erase_good_eraseblocks(struct mtd_info *mtd, unsigned char *bbt,
  66                                unsigned int eb, int ebcnt)
  67{
  68        int err;
  69        unsigned int i;
  70
  71        for (i = 0; i < ebcnt; ++i) {
  72                if (bbt[i])
  73                        continue;
  74                err = mtdtest_erase_eraseblock(mtd, eb + i);
  75                if (err)
  76                        return err;
  77                cond_resched();
  78        }
  79
  80        return 0;
  81}
  82
  83int mtdtest_read(struct mtd_info *mtd, loff_t addr, size_t size, void *buf)
  84{
  85        size_t read;
  86        int err;
  87
  88        err = mtd_read(mtd, addr, size, &read, buf);
  89        /* Ignore corrected ECC errors */
  90        if (mtd_is_bitflip(err))
  91                err = 0;
  92        if (!err && read != size)
  93                err = -EIO;
  94        if (err)
  95                pr_err("error: read failed at %#llx\n", addr);
  96
  97        return err;
  98}
  99
 100int mtdtest_write(struct mtd_info *mtd, loff_t addr, size_t size,
 101                const void *buf)
 102{
 103        size_t written;
 104        int err;
 105
 106        err = mtd_write(mtd, addr, size, &written, buf);
 107        if (!err && written != size)
 108                err = -EIO;
 109        if (err)
 110                pr_err("error: write failed at %#llx\n", addr);
 111
 112        return err;
 113}
 114