mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-30 00:21:06 +00:00
753ac61088
This patch updates the yaffs2 in u-boot to correspond to git://www.aleph1.co.uk/yaffs2 commit id 9ee5d0643e559568dbe62215f76e0a7bd5a63d93 Signed-off-by: Charles Manning <cdhmanning@gmail.com>
97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
/*
|
|
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
|
|
*
|
|
* Copyright (C) 2002-2011 Aleph One Ltd.
|
|
* for Toby Churchill Ltd and Brightstar Engineering
|
|
*
|
|
* Created by Charles Manning <charles@aleph1.co.uk>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include "yaffs_bitmap.h"
|
|
#include "yaffs_trace.h"
|
|
/*
|
|
* Chunk bitmap manipulations
|
|
*/
|
|
|
|
static inline u8 *yaffs_block_bits(struct yaffs_dev *dev, int blk)
|
|
{
|
|
if (blk < dev->internal_start_block || blk > dev->internal_end_block) {
|
|
yaffs_trace(YAFFS_TRACE_ERROR,
|
|
"BlockBits block %d is not valid",
|
|
blk);
|
|
BUG();
|
|
}
|
|
return dev->chunk_bits +
|
|
(dev->chunk_bit_stride * (blk - dev->internal_start_block));
|
|
}
|
|
|
|
void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk)
|
|
{
|
|
if (blk < dev->internal_start_block || blk > dev->internal_end_block ||
|
|
chunk < 0 || chunk >= dev->param.chunks_per_block) {
|
|
yaffs_trace(YAFFS_TRACE_ERROR,
|
|
"Chunk Id (%d:%d) invalid",
|
|
blk, chunk);
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk)
|
|
{
|
|
u8 *blk_bits = yaffs_block_bits(dev, blk);
|
|
|
|
memset(blk_bits, 0, dev->chunk_bit_stride);
|
|
}
|
|
|
|
void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
|
|
{
|
|
u8 *blk_bits = yaffs_block_bits(dev, blk);
|
|
|
|
yaffs_verify_chunk_bit_id(dev, blk, chunk);
|
|
blk_bits[chunk / 8] &= ~(1 << (chunk & 7));
|
|
}
|
|
|
|
void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
|
|
{
|
|
u8 *blk_bits = yaffs_block_bits(dev, blk);
|
|
|
|
yaffs_verify_chunk_bit_id(dev, blk, chunk);
|
|
blk_bits[chunk / 8] |= (1 << (chunk & 7));
|
|
}
|
|
|
|
int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
|
|
{
|
|
u8 *blk_bits = yaffs_block_bits(dev, blk);
|
|
|
|
yaffs_verify_chunk_bit_id(dev, blk, chunk);
|
|
return (blk_bits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
|
|
}
|
|
|
|
int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk)
|
|
{
|
|
u8 *blk_bits = yaffs_block_bits(dev, blk);
|
|
int i;
|
|
|
|
for (i = 0; i < dev->chunk_bit_stride; i++) {
|
|
if (*blk_bits)
|
|
return 1;
|
|
blk_bits++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk)
|
|
{
|
|
u8 *blk_bits = yaffs_block_bits(dev, blk);
|
|
int i;
|
|
int n = 0;
|
|
|
|
for (i = 0; i < dev->chunk_bit_stride; i++, blk_bits++)
|
|
n += hweight8(*blk_bits);
|
|
|
|
return n;
|
|
}
|