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https://github.com/AsahiLinux/u-boot
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1e94b46f73
This old patch was marked as deferred. Bring it back to life, to continue towards the removal of common.h Move this out of the common header and include it only where needed. Signed-off-by: Simon Glass <sjg@chromium.org>
136 lines
3.6 KiB
C
136 lines
3.6 KiB
C
// 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 <common.h>
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#include <dm/devres.h>
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#include <linux/bitops.h>
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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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#include <linux/printk.h>
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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 = kzalloc(nwords, 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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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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if (entry >= nanddev_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(nanddev_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 nanddev_bbt_set_block_status(struct nand_device *nand, 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 >= nanddev_neraseblocks(nand))
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return -ERANGE;
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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_block + offs - BITS_PER_LONG;
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pos[1] &= ~GENMASK(rbits - 1, 0);
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pos[1] |= val >> (bits_per_block - rbits);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(nanddev_bbt_set_block_status);
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