/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
- * Copyright (C) 2002-2010 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk);
-static const char yaffs_count_bits_table[256] = {
- 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
- 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
- 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
- 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
- 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
- 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
- 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
- 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
- 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
- 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
- 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
- 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
- 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
- 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
- 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
- 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
-};
-
-int yaffs_count_bits(u8 x)
-{
- int ret_val;
- ret_val = yaffs_count_bits_table[x];
- return ret_val;
-}
/********** Tags ECC calculations *********/
-void yaffs_calc_ecc(const u8 * data, struct yaffs_spare *spare)
+void yaffs_calc_ecc(const u8 *data, struct yaffs_spare *spare)
{
yaffs_ecc_cacl(data, spare->ecc1);
yaffs_ecc_cacl(&data[256], spare->ecc2);
void yaffs_calc_tags_ecc(struct yaffs_tags *tags)
{
/* Calculate an ecc */
-
unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes;
unsigned i, j;
unsigned ecc = 0;
ecc ^= bit;
}
}
-
tags->ecc = ecc;
-
}
int yaffs_check_tags_ecc(struct yaffs_tags *tags)
/* TODO Need to do somethiong here */
return -1; /* unrecovered error */
}
-
return 0;
}
static void yaffs_spare_init(struct yaffs_spare *spare)
{
- memset(spare, 0xFF, sizeof(struct yaffs_spare));
+ memset(spare, 0xff, sizeof(struct yaffs_spare));
}
static int yaffs_wr_nand(struct yaffs_dev *dev,
- int nand_chunk, const u8 * data,
+ int nand_chunk, const u8 *data,
struct yaffs_spare *spare)
{
if (nand_chunk < dev->param.start_block * dev->param.chunks_per_block) {
- T(YAFFS_TRACE_ERROR,
- (TSTR("**>> yaffs chunk %d is not valid" TENDSTR),
- nand_chunk));
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "**>> yaffs chunk %d is not valid",
+ nand_chunk);
return YAFFS_FAIL;
}
static int yaffs_rd_chunk_nand(struct yaffs_dev *dev,
int nand_chunk,
- u8 * data,
+ u8 *data,
struct yaffs_spare *spare,
enum yaffs_ecc_result *ecc_result,
int correct_errors)
int ret_val;
struct yaffs_spare local_spare;
- if (!spare && data) {
+ if (!spare) {
/* If we don't have a real spare, then we use a local one. */
/* Need this for the calculation of the ecc */
spare = &local_spare;
calc_ecc);
if (ecc_result1 > 0) {
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("**>>yaffs ecc error fix performed on chunk %d:0"
- TENDSTR), nand_chunk));
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "**>>yaffs ecc error fix performed on chunk %d:0",
+ nand_chunk);
dev->n_ecc_fixed++;
} else if (ecc_result1 < 0) {
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("**>>yaffs ecc error unfixed on chunk %d:0"
- TENDSTR), nand_chunk));
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "**>>yaffs ecc error unfixed on chunk %d:0",
+ nand_chunk);
dev->n_ecc_unfixed++;
}
if (ecc_result2 > 0) {
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("**>>yaffs ecc error fix performed on chunk %d:1"
- TENDSTR), nand_chunk));
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "**>>yaffs ecc error fix performed on chunk %d:1",
+ nand_chunk);
dev->n_ecc_fixed++;
} else if (ecc_result2 < 0) {
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("**>>yaffs ecc error unfixed on chunk %d:1"
- TENDSTR), nand_chunk));
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "**>>yaffs ecc error unfixed on chunk %d:1",
+ nand_chunk);
dev->n_ecc_unfixed++;
}
memcpy(spare, &nspare, sizeof(struct yaffs_spare));
if (data && correct_errors) {
if (nspare.eccres1 > 0) {
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("**>>mtd ecc error fix performed on chunk %d:0"
- TENDSTR), nand_chunk));
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "**>>mtd ecc error fix performed on chunk %d:0",
+ nand_chunk);
} else if (nspare.eccres1 < 0) {
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("**>>mtd ecc error unfixed on chunk %d:0"
- TENDSTR), nand_chunk));
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "**>>mtd ecc error unfixed on chunk %d:0",
+ nand_chunk);
}
if (nspare.eccres2 > 0) {
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("**>>mtd ecc error fix performed on chunk %d:1"
- TENDSTR), nand_chunk));
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "**>>mtd ecc error fix performed on chunk %d:1",
+ nand_chunk);
} else if (nspare.eccres2 < 0) {
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("**>>mtd ecc error unfixed on chunk %d:1"
- TENDSTR), nand_chunk));
+ yaffs_trace(YAFFS_TRACE_ERROR,
+ "**>>mtd ecc error unfixed on chunk %d:1",
+ nand_chunk);
}
if (nspare.eccres1 || nspare.eccres2) {
int flash_block = nand_chunk / dev->param.chunks_per_block;
/* Mark the block for retirement */
- yaffs_get_block_info(dev,
- flash_block + dev->block_offset)->needs_retiring =
- 1;
- T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- (TSTR("**>>Block %d marked for retirement" TENDSTR), flash_block));
+ yaffs_get_block_info(dev, flash_block + dev->block_offset)->
+ needs_retiring = 1;
+ yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+ "**>>Block %d marked for retirement",
+ flash_block);
/* TODO:
* Just do a garbage collection on the affected block
int yaffs_tags_compat_wr(struct yaffs_dev *dev,
int nand_chunk,
- const u8 * data, const struct yaffs_ext_tags *ext_tags)
+ const u8 *data, const struct yaffs_ext_tags *ext_tags)
{
struct yaffs_spare spare;
struct yaffs_tags tags;
tags.obj_id = ext_tags->obj_id;
tags.chunk_id = ext_tags->chunk_id;
- tags.n_bytes_lsb = ext_tags->n_bytes & 0x3ff;
+ tags.n_bytes_lsb = ext_tags->n_bytes & (1024 - 1);
if (dev->data_bytes_per_chunk >= 1024)
tags.n_bytes_msb = (ext_tags->n_bytes >> 10) & 3;
yaffs_calc_ecc(data, &spare);
yaffs_load_tags_to_spare(&spare, &tags);
-
}
-
return yaffs_wr_nand(dev, nand_chunk, data, &spare);
}
int yaffs_tags_compat_rd(struct yaffs_dev *dev,
int nand_chunk,
- u8 * data, struct yaffs_ext_tags *ext_tags)
+ u8 *data, struct yaffs_ext_tags *ext_tags)
{
-
struct yaffs_spare spare;
struct yaffs_tags tags;
enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
-
static struct yaffs_spare spare_ff;
static int init;
+ int deleted;
if (!init) {
- memset(&spare_ff, 0xFF, sizeof(spare_ff));
+ memset(&spare_ff, 0xff, sizeof(spare_ff));
init = 1;
}
- if (yaffs_rd_chunk_nand(dev, nand_chunk, data, &spare, &ecc_result, 1)) {
- /* ext_tags may be NULL */
- if (ext_tags) {
-
- int deleted =
- (yaffs_count_bits(spare.page_status) < 7) ? 1 : 0;
+ if (!yaffs_rd_chunk_nand(dev, nand_chunk,
+ data, &spare, &ecc_result, 1))
+ return YAFFS_FAIL;
- ext_tags->is_deleted = deleted;
- ext_tags->ecc_result = ecc_result;
- ext_tags->block_bad = 0; /* We're reading it */
- /* therefore it is not a bad block */
- ext_tags->chunk_used =
- (memcmp(&spare_ff, &spare, sizeof(spare_ff)) !=
- 0) ? 1 : 0;
+ /* ext_tags may be NULL */
+ if (!ext_tags)
+ return YAFFS_OK;
- if (ext_tags->chunk_used) {
- yaffs_get_tags_from_spare(dev, &spare, &tags);
+ deleted = (hweight8(spare.page_status) < 7) ? 1 : 0;
- ext_tags->obj_id = tags.obj_id;
- ext_tags->chunk_id = tags.chunk_id;
- ext_tags->n_bytes = tags.n_bytes_lsb;
+ ext_tags->is_deleted = deleted;
+ ext_tags->ecc_result = ecc_result;
+ ext_tags->block_bad = 0; /* We're reading it */
+ /* therefore it is not a bad block */
+ ext_tags->chunk_used =
+ memcmp(&spare_ff, &spare, sizeof(spare_ff)) ? 1 : 0;
- if (dev->data_bytes_per_chunk >= 1024)
- ext_tags->n_bytes |=
- (((unsigned)tags.
- n_bytes_msb) << 10);
+ if (ext_tags->chunk_used) {
+ yaffs_get_tags_from_spare(dev, &spare, &tags);
+ ext_tags->obj_id = tags.obj_id;
+ ext_tags->chunk_id = tags.chunk_id;
+ ext_tags->n_bytes = tags.n_bytes_lsb;
- ext_tags->serial_number = tags.serial_number;
- }
- }
+ if (dev->data_bytes_per_chunk >= 1024)
+ ext_tags->n_bytes |=
+ (((unsigned)tags.n_bytes_msb) << 10);
- return YAFFS_OK;
- } else {
- return YAFFS_FAIL;
+ ext_tags->serial_number = tags.serial_number;
}
+
+ return YAFFS_OK;
}
int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int flash_block)
{
-
struct yaffs_spare spare;
memset(&spare, 0xff, sizeof(struct yaffs_spare));
NULL, &spare);
return YAFFS_OK;
-
}
int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
int block_no,
enum yaffs_block_state *state,
- u32 * seq_number)
+ u32 *seq_number)
{
-
struct yaffs_spare spare0, spare1;
static struct yaffs_spare spare_ff;
static int init;
enum yaffs_ecc_result dummy;
if (!init) {
- memset(&spare_ff, 0xFF, sizeof(spare_ff));
+ memset(&spare_ff, 0xff, sizeof(spare_ff));
init = 1;
}
yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block + 1,
NULL, &spare1, &dummy, 1);
- if (yaffs_count_bits(spare0.block_status & spare1.block_status) < 7)
+ if (hweight8(spare0.block_status & spare1.block_status) < 7)
*state = YAFFS_BLOCK_STATE_DEAD;
else if (memcmp(&spare_ff, &spare0, sizeof(spare_ff)) == 0)
*state = YAFFS_BLOCK_STATE_EMPTY;
else
- *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+ *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
return YAFFS_OK;
}
projects / yaffs2.git / blobdiff