132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2017 Free Electrons
|
|
*
|
|
* Authors:
|
|
* Boris Brezillon <boris.brezillon@free-electrons.com>
|
|
* Peter Pan <peterpandong@micron.com>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "nand-bbt: " fmt
|
|
|
|
#include <linux/mtd/nand.h>
|
|
#include <linux/slab.h>
|
|
|
|
/**
|
|
* nanddev_bbt_init() - Initialize the BBT (Bad Block Table)
|
|
* @nand: NAND device
|
|
*
|
|
* Initialize the in-memory BBT.
|
|
*
|
|
* Return: 0 in case of success, a negative error code otherwise.
|
|
*/
|
|
int nanddev_bbt_init(struct nand_device *nand)
|
|
{
|
|
unsigned int bits_per_block = fls(NAND_BBT_BLOCK_NUM_STATUS);
|
|
unsigned int nblocks = nanddev_neraseblocks(nand);
|
|
unsigned int nwords = DIV_ROUND_UP(nblocks * bits_per_block,
|
|
BITS_PER_LONG);
|
|
|
|
nand->bbt.cache = kcalloc(nwords, sizeof(*nand->bbt.cache),
|
|
GFP_KERNEL);
|
|
if (!nand->bbt.cache)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nanddev_bbt_init);
|
|
|
|
/**
|
|
* nanddev_bbt_cleanup() - Cleanup the BBT (Bad Block Table)
|
|
* @nand: NAND device
|
|
*
|
|
* Undoes what has been done in nanddev_bbt_init()
|
|
*/
|
|
void nanddev_bbt_cleanup(struct nand_device *nand)
|
|
{
|
|
kfree(nand->bbt.cache);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nanddev_bbt_cleanup);
|
|
|
|
/**
|
|
* nanddev_bbt_update() - Update a BBT
|
|
* @nand: nand device
|
|
*
|
|
* Update the BBT. Currently a NOP function since on-flash bbt is not yet
|
|
* supported.
|
|
*
|
|
* Return: 0 in case of success, a negative error code otherwise.
|
|
*/
|
|
int nanddev_bbt_update(struct nand_device *nand)
|
|
{
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nanddev_bbt_update);
|
|
|
|
/**
|
|
* nanddev_bbt_get_block_status() - Return the status of an eraseblock
|
|
* @nand: nand device
|
|
* @entry: the BBT entry
|
|
*
|
|
* Return: a positive number nand_bbt_block_status status or -%ERANGE if @entry
|
|
* is bigger than the BBT size.
|
|
*/
|
|
int nanddev_bbt_get_block_status(const struct nand_device *nand,
|
|
unsigned int entry)
|
|
{
|
|
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 status;
|
|
|
|
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;
|
|
|
|
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_block + offs - BITS_PER_LONG;
|
|
|
|
pos[1] &= ~GENMASK(rbits - 1, 0);
|
|
pos[1] |= val >> (bits_per_block - rbits);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nanddev_bbt_set_block_status);
|