Analysis of nandflash driver under Linux (2) - Based on s3c6410 platform

if(chip->ecc.steps * chip->ecc.size != mtd->writesize) {

printk(KERN_WARNING "Invalid ecc parametersn");

BUG();

}

chip->ecc.total = chip->ecc.steps * chip->ecc.bytes;

/*

* Allow subpage writes up to ecc.steps. Not possible for MLC

* FLASH.

*/

if (!(chip->options & NAND_NO_SUBPAGE_WRITE) &&

   !(chip->cellinfo & NAND_CI_CELLTYPE_MSK)) {

switch(chip->ecc.steps) {

case 2:

mtd->subpage_sft = 1;

break;

case 4:

case 8:

mtd->subpage_sft = 2;

break;

}

}

chip->subpagesize = mtd->writesize >> mtd->subpage_sft;

/* Initialize state */

chip->state = FL_READY;

/* De-select the device */

chip->select_chip(mtd, -1);

/* Invalidate the pagebuffer reference */

chip->pagebuf = -1;

/* Fill in remaining MTD driver data */

mtd->type = MTD_NANDFLASH;

mtd->flags = MTD_CAP_NANDFLASH;

mtd->erase = nand_erase;

mtd->point = NULL;

mtd->unpoint = NULL;

mtd->read = nand_read;

mtd->write = nand_write;

mtd->read_oob = nand_read_oob;

mtd->write_oob = nand_write_oob;

mtd->sync = nand_sync;

mtd->lock = NULL;

mtd->unlock = NULL;

mtd->suspend = nand_suspend;

mtd->resume = nand_resume;

mtd->block_isbad = nand_block_isbad;

mtd->block_markbad = nand_block_markbad;

    Assign values ​​to the rest of the struct mtd_info structure

/* propagate ecc.layout to mtd_info */

mtd->ecclayout = chip->ecc.layout;

/* Check, if we should skip the bad block table scan */

if (chip->options & NAND_SKIP_BBTSCAN)

return 0;

/* Build bad block table */ Build bad block table

return chip->scan_bbt(mtd);

}