// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2017 Free Electrons
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*
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* Authors:
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* Boris Brezillon <boris.brezillon@free-electrons.com>
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* Peter Pan <peterpandong@micron.com>
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*/
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#include <linux/mtd/mtd.h>
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#include <linux/slab.h>
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#include "sfc_nand.h"
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#include "sfc_nand_mtd.h"
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#ifdef CONFIG_MTD_NAND_BBT_USING_FLASH
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#ifdef BBT_DEBUG
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#define BBT_DBG pr_err
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#else
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#define BBT_DBG(args...)
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#endif
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struct nanddev_bbt_info {
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u8 pattern[4];
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unsigned int version;
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};
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static u8 bbt_pattern[] = {'B', 'b', 't', '0' };
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/**
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* nanddev_read_bbt() - Read the BBT (Bad Block Table)
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* @nand: NAND device
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* @block: bbt block address
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* @update: true - get version and overwrite bbt.cache with new version;
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* false - get bbt version only;
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*
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* Initialize the in-memory BBT.
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*
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* Return: 0 in case of success, a negative error code otherwise.
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*/
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static int nanddev_read_bbt(struct snand_mtd_dev *nand, u32 block, bool update)
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{
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unsigned int bits_per_block = fls(NAND_BBT_BLOCK_NUM_STATUS);
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unsigned int nblocks = snanddev_neraseblocks(nand);
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unsigned int nbytes = DIV_ROUND_UP(nblocks * bits_per_block,
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BITS_PER_LONG) * sizeof(*nand->bbt.cache);
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struct mtd_info *mtd = snanddev_to_mtd(nand);
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u8 *data_buf, *oob_buf, *temp_buf;
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struct nanddev_bbt_info *bbt_info;
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struct mtd_oob_ops ops;
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u32 bbt_page_num;
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int ret = 0;
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unsigned int version = 0;
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u32 page_addr, i;
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if (!nand->bbt.cache)
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return -ENOMEM;
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if (block >= nblocks)
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return -EINVAL;
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/* aligned to page size, and even pages is better */
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bbt_page_num = (sizeof(struct nanddev_bbt_info) + nbytes +
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mtd->writesize - 1) >> mtd->writesize_shift;
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bbt_page_num = (bbt_page_num + 1) / 2 * 2;
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data_buf = kzalloc(bbt_page_num * mtd->writesize, GFP_KERNEL);
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if (!data_buf)
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return -ENOMEM;
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oob_buf = kzalloc(bbt_page_num * mtd->oobsize, GFP_KERNEL);
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if (!oob_buf) {
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kfree(data_buf);
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return -ENOMEM;
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}
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bbt_info = (struct nanddev_bbt_info *)(data_buf + nbytes);
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memset(&ops, 0, sizeof(struct mtd_oob_ops));
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ops.mode = MTD_OPS_PLACE_OOB;
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ops.datbuf = data_buf;
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ops.len = bbt_page_num * mtd->writesize;
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ops.oobbuf = oob_buf;
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ops.ooblen = bbt_page_num * mtd->oobsize;
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ops.ooboffs = 0;
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/* Store one entry for each block */
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temp_buf = kzalloc(mtd->writesize + mtd->oobsize, GFP_KERNEL);
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if (!temp_buf) {
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kfree(data_buf);
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kfree(oob_buf);
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return -ENOMEM;
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}
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page_addr = (u32)(block << (mtd->erasesize_shift - mtd->writesize_shift));
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for (i = 0; i < bbt_page_num; i++) {
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ret = sfc_nand_read_page_raw(0, page_addr + i, (u32 *)temp_buf);
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if (ret < 0) {
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pr_err("%s fail %d\n", __func__, ret);
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ret = -EIO;
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kfree(temp_buf);
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goto out;
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}
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memcpy(ops.datbuf + i * mtd->writesize, temp_buf, mtd->writesize);
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memcpy(ops.oobbuf + i * mtd->oobsize, temp_buf + mtd->writesize, mtd->oobsize);
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}
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kfree(temp_buf);
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if (oob_buf[0] != 0xff && !memcmp(bbt_pattern, bbt_info->pattern, 4))
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version = bbt_info->version;
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BBT_DBG("read_bbt from blk=%d tag=%d ver=%d\n", block, update, version);
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if (update && version > nand->bbt.version) {
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memcpy(nand->bbt.cache, data_buf, nbytes);
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nand->bbt.version = version;
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}
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out:
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kfree(data_buf);
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kfree(oob_buf);
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return ret < 0 ? -EIO : (int)version;
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}
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static int nanddev_write_bbt(struct snand_mtd_dev *nand, u32 block)
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{
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unsigned int bits_per_block = fls(NAND_BBT_BLOCK_NUM_STATUS);
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unsigned int nblocks = snanddev_neraseblocks(nand);
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unsigned int nbytes = DIV_ROUND_UP(nblocks * bits_per_block,
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BITS_PER_LONG) * sizeof(*nand->bbt.cache);
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struct mtd_info *mtd = snanddev_to_mtd(nand);
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u8 *data_buf, *oob_buf, *temp_buf;
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struct nanddev_bbt_info *bbt_info;
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struct mtd_oob_ops ops;
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u32 bbt_page_num;
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int ret = 0;
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u32 page_addr, i;
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BBT_DBG("write_bbt to blk=%d ver=%d\n", block, nand->bbt.version);
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if (!nand->bbt.cache)
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return -ENOMEM;
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if (block >= nblocks)
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return -EINVAL;
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/* aligned to page size, and even pages is better */
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bbt_page_num = (sizeof(struct nanddev_bbt_info) + nbytes +
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mtd->writesize - 1) >> mtd->writesize_shift;
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bbt_page_num = (bbt_page_num + 1) / 2 * 2;
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data_buf = kzalloc(bbt_page_num * mtd->writesize, GFP_KERNEL);
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if (!data_buf)
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return -ENOMEM;
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oob_buf = kzalloc(bbt_page_num * mtd->oobsize, GFP_KERNEL);
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if (!oob_buf) {
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kfree(data_buf);
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return -ENOMEM;
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}
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bbt_info = (struct nanddev_bbt_info *)(data_buf + nbytes);
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memcpy(data_buf, nand->bbt.cache, nbytes);
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memcpy(bbt_info, bbt_pattern, 4);
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bbt_info->version = nand->bbt.version;
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/* Store one entry for each block */
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ret = sfc_nand_erase_mtd(mtd, block * mtd->erasesize);
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if (ret)
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goto out;
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memset(&ops, 0, sizeof(struct mtd_oob_ops));
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ops.datbuf = data_buf;
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ops.len = bbt_page_num * mtd->writesize;
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ops.oobbuf = oob_buf;
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ops.ooblen = bbt_page_num * mtd->oobsize;
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ops.ooboffs = 0;
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temp_buf = kzalloc(mtd->writesize + mtd->oobsize, GFP_KERNEL);
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if (!temp_buf) {
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kfree(data_buf);
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kfree(oob_buf);
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return -ENOMEM;
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}
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page_addr = (u32)(block << (mtd->erasesize_shift - mtd->writesize_shift));
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for (i = 0; i < bbt_page_num; i++) {
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memcpy(temp_buf, ops.datbuf + i * mtd->writesize, mtd->writesize);
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memcpy(temp_buf + mtd->writesize, ops.oobbuf + i * mtd->oobsize, mtd->oobsize);
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ret = sfc_nand_prog_page_raw(0, page_addr + i, (u32 *)temp_buf);
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if (ret < 0) {
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pr_err("%s fail %d\n", __func__, ret);
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ret = -EIO;
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kfree(temp_buf);
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goto out;
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}
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}
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kfree(temp_buf);
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out:
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kfree(data_buf);
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kfree(oob_buf);
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return ret;
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}
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static int nanddev_bbt_format(struct snand_mtd_dev *nand)
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{
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unsigned int nblocks = snanddev_neraseblocks(nand);
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struct mtd_info *mtd = snanddev_to_mtd(nand);
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u32 start_block, block;
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start_block = nblocks - NANDDEV_BBT_SCAN_MAXBLOCKS;
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for (block = 0; block < nblocks; block++) {
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if (sfc_nand_isbad_mtd(mtd, block * mtd->erasesize))
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snanddev_bbt_set_block_status(nand, block,
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NAND_BBT_BLOCK_FACTORY_BAD);
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}
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for (block = 0; block < NANDDEV_BBT_SCAN_MAXBLOCKS; block++) {
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if (snanddev_bbt_get_block_status(nand, start_block + block) ==
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NAND_BBT_BLOCK_GOOD)
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snanddev_bbt_set_block_status(nand, start_block + block,
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NAND_BBT_BLOCK_WORN);
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}
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return 0;
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}
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static int nanddev_scan_bbt(struct snand_mtd_dev *nand)
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{
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unsigned int nblocks = snanddev_neraseblocks(nand);
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u32 start_block, block;
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int ret = 0;
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nand->bbt.version = 0;
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start_block = nblocks - NANDDEV_BBT_SCAN_MAXBLOCKS;
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for (block = 0; block < NANDDEV_BBT_SCAN_MAXBLOCKS; block++)
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nanddev_read_bbt(nand, start_block + block, true);
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nand->bbt.option |= NANDDEV_BBT_SCANNED;
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if (nand->bbt.version == 0) {
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nanddev_bbt_format(nand);
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ret = snanddev_bbt_update(nand);
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if (ret) {
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nand->bbt.option = 0;
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pr_err("%s fail\n", __func__);
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}
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}
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return ret;
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}
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#endif
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/**
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* nanddev_bbt_init() - Initialize the BBT (Bad Block Table)
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* @nand: NAND device
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*
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* Initialize the in-memory BBT.
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*
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* Return: 0 in case of success, a negative error code otherwise.
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*/
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int snanddev_bbt_init(struct snand_mtd_dev *nand)
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{
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unsigned int bits_per_block = fls(NAND_BBT_BLOCK_NUM_STATUS);
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unsigned int nblocks = snanddev_neraseblocks(nand);
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unsigned int nwords = DIV_ROUND_UP(nblocks * bits_per_block,
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BITS_PER_LONG);
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nand->bbt.cache = kcalloc(nwords, sizeof(*nand->bbt.cache),
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GFP_KERNEL);
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if (!nand->bbt.cache)
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return -ENOMEM;
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return 0;
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}
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EXPORT_SYMBOL_GPL(snanddev_bbt_init);
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/**
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* nanddev_bbt_cleanup() - Cleanup the BBT (Bad Block Table)
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* @nand: NAND device
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*
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* Undoes what has been done in nanddev_bbt_init()
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*/
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void snanddev_bbt_cleanup(struct snand_mtd_dev *nand)
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{
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kfree(nand->bbt.cache);
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}
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EXPORT_SYMBOL_GPL(snanddev_bbt_cleanup);
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/**
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* nanddev_bbt_update() - Update a BBT
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* @nand: nand device
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*
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* Update the BBT. Currently a NOP function since on-flash bbt is not yet
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* supported.
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*
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* Return: 0 in case of success, a negative error code otherwise.
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*/
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int snanddev_bbt_update(struct snand_mtd_dev *nand)
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{
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#ifdef CONFIG_MTD_NAND_BBT_USING_FLASH
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if (nand->bbt.cache &&
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nand->bbt.option & NANDDEV_BBT_USE_FLASH) {
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unsigned int nblocks = snanddev_neraseblocks(nand);
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u32 bbt_version[NANDDEV_BBT_SCAN_MAXBLOCKS];
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int start_block, block;
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u32 min_version, block_des;
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int ret, count = 0;
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start_block = nblocks - NANDDEV_BBT_SCAN_MAXBLOCKS;
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for (block = 0; block < NANDDEV_BBT_SCAN_MAXBLOCKS; block++) {
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ret = snanddev_bbt_get_block_status(nand, start_block + block);
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if (ret == NAND_BBT_BLOCK_FACTORY_BAD) {
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bbt_version[block] = 0xFFFFFFFF;
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continue;
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}
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ret = nanddev_read_bbt(nand, start_block + block,
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false);
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if (ret < 0)
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bbt_version[block] = 0xFFFFFFFF;
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else if (ret == 0)
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bbt_version[block] = 0;
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else
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bbt_version[block] = ret;
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}
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get_min_ver:
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min_version = 0xFFFFFFFF;
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block_des = 0;
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for (block = 0; block < NANDDEV_BBT_SCAN_MAXBLOCKS; block++) {
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if (bbt_version[block] < min_version) {
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min_version = bbt_version[block];
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block_des = start_block + block;
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}
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}
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if (block_des > 0) {
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nand->bbt.version++;
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ret = nanddev_write_bbt(nand, block_des);
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bbt_version[block_des - start_block] = 0xFFFFFFFF;
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if (ret) {
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pr_err("%s blk= %d ret= %d\n", __func__,
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block_des, ret);
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goto get_min_ver;
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} else {
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count++;
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if (count < 2)
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goto get_min_ver;
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BBT_DBG("%s success\n", __func__);
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}
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} else {
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pr_err("%s failed\n", __func__);
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return -1;
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}
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}
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#endif
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return 0;
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}
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EXPORT_SYMBOL_GPL(snanddev_bbt_update);
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/**
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* nanddev_bbt_get_block_status() - Return the status of an eraseblock
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* @nand: nand device
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* @entry: the BBT entry
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*
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* Return: a positive number nand_bbt_block_status status or -%ERANGE if @entry
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* is bigger than the BBT size.
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*/
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int snanddev_bbt_get_block_status(const struct snand_mtd_dev *nand,
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unsigned int entry)
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{
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unsigned int bits_per_block = fls(NAND_BBT_BLOCK_NUM_STATUS);
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unsigned long *pos = nand->bbt.cache +
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((entry * bits_per_block) / BITS_PER_LONG);
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unsigned int offs = (entry * bits_per_block) % BITS_PER_LONG;
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unsigned long status;
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#ifdef CONFIG_MTD_NAND_BBT_USING_FLASH
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if (nand->bbt.option & NANDDEV_BBT_USE_FLASH &&
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!(nand->bbt.option & NANDDEV_BBT_SCANNED))
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nanddev_scan_bbt((struct snand_mtd_dev *)nand);
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#endif
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if (entry >= snanddev_neraseblocks(nand))
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return -ERANGE;
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status = pos[0] >> offs;
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if (bits_per_block + offs > BITS_PER_LONG)
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status |= pos[1] << (BITS_PER_LONG - offs);
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return status & GENMASK(bits_per_block - 1, 0);
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}
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EXPORT_SYMBOL_GPL(snanddev_bbt_get_block_status);
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/**
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* nanddev_bbt_set_block_status() - Update the status of an eraseblock in the
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* in-memory BBT
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* @nand: nand device
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* @entry: the BBT entry to update
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* @status: the new status
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*
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* Update an entry of the in-memory BBT. If you want to push the updated BBT
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* the NAND you should call nanddev_bbt_update().
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*
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* Return: 0 in case of success or -%ERANGE if @entry is bigger than the BBT
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* size.
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*/
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int snanddev_bbt_set_block_status(struct snand_mtd_dev *nand,
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unsigned int entry,
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enum nand_bbt_block_status status)
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{
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unsigned int bits_per_block = fls(NAND_BBT_BLOCK_NUM_STATUS);
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unsigned long *pos = nand->bbt.cache +
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((entry * bits_per_block) / BITS_PER_LONG);
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unsigned int offs = (entry * bits_per_block) % BITS_PER_LONG;
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unsigned long val = status & GENMASK(bits_per_block - 1, 0);
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if (entry >= snanddev_neraseblocks(nand))
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return -ERANGE;
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if (offs + bits_per_block - 1 > (BITS_PER_LONG - 1))
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pos[0] &= ~GENMASK(BITS_PER_LONG - 1, offs);
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else
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pos[0] &= ~GENMASK(offs + bits_per_block - 1, offs);
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pos[0] |= val << offs;
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if (bits_per_block + offs > BITS_PER_LONG) {
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unsigned int rbits = BITS_PER_LONG - offs;
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pos[1] &= ~GENMASK(bits_per_block - rbits - 1, 0);
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pos[1] |= val >> rbits;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(snanddev_bbt_set_block_status);
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