412 lines
11 KiB
C
412 lines
11 KiB
C
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// 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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#define pr_fmt(fmt) "nand-bbt: " fmt
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#include <linux/mtd/nand.h>
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#ifndef __UBOOT__
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#include <linux/slab.h>
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#endif
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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 nand_device *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 = nanddev_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 = nanddev_to_mtd(nand);
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u8 *data_buf, *oob_buf;
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struct nanddev_bbt_info *bbt_info;
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struct mtd_oob_ops ops;
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int bbt_page_num;
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int ret = 0;
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unsigned int version = 0;
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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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ret = mtd_read_oob(mtd, block * mtd->erasesize, &ops);
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if (ret && ret != -EUCLEAN) {
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pr_err("%s fail %d\n", __func__, ret);
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ret = -EIO;
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goto out;
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} else {
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ret = 0;
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}
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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 : version;
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}
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static int nanddev_write_bbt(struct nand_device *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 = nanddev_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 = nanddev_to_mtd(nand);
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u8 *data_buf, *oob_buf;
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struct nanddev_bbt_info *bbt_info;
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struct mtd_oob_ops ops;
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int bbt_page_num;
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int ret = 0;
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struct nand_pos pos;
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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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nanddev_offs_to_pos(nand, block * mtd->erasesize, &pos);
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ret = nand->ops->erase(nand, &pos);
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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.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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ret = mtd_write_oob(mtd, block * mtd->erasesize, &ops);
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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 __maybe_unused int nanddev_bbt_format(struct nand_device *nand)
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{
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unsigned int nblocks = nanddev_neraseblocks(nand);
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struct mtd_info *mtd = nanddev_to_mtd(nand);
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struct nand_pos pos;
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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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nanddev_offs_to_pos(nand, block * mtd->erasesize, &pos);
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if (nanddev_isbad(nand, &pos))
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nanddev_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 (nanddev_bbt_get_block_status(nand, start_block + block) ==
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NAND_BBT_BLOCK_GOOD)
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nanddev_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 nand_device *nand)
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{
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unsigned int nblocks = nanddev_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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#ifndef CONFIG_SPL_BUILD
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if (nand->bbt.version == 0) {
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nanddev_bbt_format(nand);
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ret = nanddev_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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#endif
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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 nanddev_bbt_init(struct nand_device *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 = nanddev_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(nanddev_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 nanddev_bbt_cleanup(struct nand_device *nand)
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{
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kfree(nand->bbt.cache);
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}
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EXPORT_SYMBOL_GPL(nanddev_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 nanddev_bbt_update(struct nand_device *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 = nanddev_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 = nanddev_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(nanddev_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 nanddev_bbt_get_block_status(const struct nand_device *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 &&
|
||
|
|
!(nand->bbt.option & NANDDEV_BBT_SCANNED))
|
||
|
|
nanddev_scan_bbt((struct nand_device *)nand);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
if (entry >= nanddev_neraseblocks(nand))
|
||
|
|
return -ERANGE;
|
||
|
|
|
||
|
|
status = pos[0] >> offs;
|
||
|
|
if (bits_per_block + offs > BITS_PER_LONG)
|
||
|
|
status |= pos[1] << (BITS_PER_LONG - offs);
|
||
|
|
|
||
|
|
return status & GENMASK(bits_per_block - 1, 0);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(nanddev_bbt_get_block_status);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* nanddev_bbt_set_block_status() - Update the status of an eraseblock in the
|
||
|
|
* in-memory BBT
|
||
|
|
* @nand: nand device
|
||
|
|
* @entry: the BBT entry to update
|
||
|
|
* @status: the new status
|
||
|
|
*
|
||
|
|
* Update an entry of the in-memory BBT. If you want to push the updated BBT
|
||
|
|
* the NAND you should call nanddev_bbt_update().
|
||
|
|
*
|
||
|
|
* Return: 0 in case of success or -%ERANGE if @entry is bigger than the BBT
|
||
|
|
* size.
|
||
|
|
*/
|
||
|
|
int nanddev_bbt_set_block_status(struct nand_device *nand, unsigned int entry,
|
||
|
|
enum nand_bbt_block_status status)
|
||
|
|
{
|
||
|
|
unsigned int bits_per_block = fls(NAND_BBT_BLOCK_NUM_STATUS);
|
||
|
|
unsigned long *pos = nand->bbt.cache +
|
||
|
|
((entry * bits_per_block) / BITS_PER_LONG);
|
||
|
|
unsigned int offs = (entry * bits_per_block) % BITS_PER_LONG;
|
||
|
|
unsigned long val = status & GENMASK(bits_per_block - 1, 0);
|
||
|
|
|
||
|
|
if (entry >= nanddev_neraseblocks(nand))
|
||
|
|
return -ERANGE;
|
||
|
|
|
||
|
|
if (offs + bits_per_block - 1 > (BITS_PER_LONG - 1))
|
||
|
|
pos[0] &= ~GENMASK(BITS_PER_LONG - 1, offs);
|
||
|
|
else
|
||
|
|
pos[0] &= ~GENMASK(offs + bits_per_block - 1, offs);
|
||
|
|
pos[0] |= val << offs;
|
||
|
|
|
||
|
|
if (bits_per_block + offs > BITS_PER_LONG) {
|
||
|
|
unsigned int rbits = BITS_PER_LONG - offs;
|
||
|
|
|
||
|
|
pos[1] &= ~GENMASK(bits_per_block - rbits - 1, 0);
|
||
|
|
pos[1] |= val >> rbits;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(nanddev_bbt_set_block_status);
|