int yaffs_CheckECCOnTags(yaffs_Tags * tags)
{
unsigned ecc = tags->ecc;
yaffs_CalcTagsECC(tags);
ecc ^= tags->ecc;
if (ecc && ecc <= 64) {
/* TODO: Handle the failure better. Retire? */
unsigned char *b = ((yaffs_TagsUnion *) tags)->asBytes;
ecc--;
b[ecc / 8] ^= (1 << (ecc & 7));
/* Now recvalc the ecc */
yaffs_CalcTagsECC(tags);
return 1; /* recovered error */
} else if (ecc) {
/* Wierd ecc failure value */
/* TODO Need to do somethiong here */
return -1; /* unrecovered error */
}
return 0;
}
int yaffs_CheckECCOnTags(yaffs_Tags * tags)
{
unsigned ecc = tags->ecc;
yaffs_CalcTagsECC(tags);
ecc ^= tags->ecc;
if (ecc && ecc <= 64) {
unsigned char *b = ((yaffs_TagsUnion *) tags)->asBytes;
ecc--;
b[ecc / 8] ^= (1 << (ecc & 7));
yaffs_CalcTagsECC(tags);
return 1;
} else if (ecc) {
return -1;
}
return 0;
}
static void yaffs_LoadTagsIntoSpare(yaffs_Spare * sparePtr,
yaffs_Tags * tagsPtr)
{
yaffs_TagsUnion *tu = (yaffs_TagsUnion *) tagsPtr;
yaffs_CalcTagsECC(tagsPtr);
sparePtr->tagByte0 = tu->asBytes[0];
sparePtr->tagByte1 = tu->asBytes[1];
sparePtr->tagByte2 = tu->asBytes[2];
sparePtr->tagByte3 = tu->asBytes[3];
sparePtr->tagByte4 = tu->asBytes[4];
sparePtr->tagByte5 = tu->asBytes[5];
sparePtr->tagByte6 = tu->asBytes[6];
sparePtr->tagByte7 = tu->asBytes[7];
#if defined(CONFIG_MOT_FEAT_MTD_FS) && defined(YAFFS_OOB_DEBUG)
if (mtd_fs_runtime_info >= 2)
{
printk("%s: (Before Write)\n",__FUNCTION__);
printk(" Tags: chunkId=%d, SN=%d, byteCount=%d, OId=%d\n",
tagsPtr->chunkId, tagsPtr->serialNumber, tagsPtr->byteCount,
tagsPtr->objectId);
printk(" Spare: tagByte0=0x%x, tagByte1=0x%x, tagByte2=0x%x, tagByte3=0x%x\n",
sparePtr->tagByte0, sparePtr->tagByte1, sparePtr->tagByte2,sparePtr->tagByte3);
printk(" tagByte4=0x%x, tagByte5=0x%x, tagByte6=0x%x, tagByte7=0x%x\n",
sparePtr->tagByte4, sparePtr->tagByte5, sparePtr->tagByte6,sparePtr->tagByte7);
printk(" pageStatus=0x%x\n",sparePtr->pageStatus);
}
#endif
}
/* Write a chunk (page) of data to NAND.
*
* Caller always provides ExtendedTags data which are converted to a more
* compact (packed) form for storage in NAND. A mini-ECC runs over the
* contents of the tags meta-data; used to valid the tags when read.
*
* - Pack ExtendedTags to PackedTags1 form
* - Compute mini-ECC for PackedTags1
* - Write data and packed tags to NAND.
*
* Note: Due to the use of the PackedTags1 meta-data which does not include
* a full sequence number (as found in the larger PackedTags2 form) it is
* necessary for Yaffs to re-write a chunk/page (just once) to mark it as
* discarded and dirty. This is not ideal: newer NAND parts are supposed
* to be written just once. When Yaffs performs this operation, this
* function is called with a NULL data pointer -- calling MTD write_oob
* without data is valid usage (2.6.17).
*
* Any underlying MTD error results in YAFFS_FAIL.
* Returns YAFFS_OK or YAFFS_FAIL.
*/
int nandmtd1_WriteChunkWithTagsToNAND(yaffs_Device *dev,
int chunkInNAND, const __u8 * data, const yaffs_ExtendedTags * etags)
{
struct mtd_info * mtd = dev->genericDevice;
int chunkBytes = dev->nDataBytesPerChunk;
loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
struct mtd_oob_ops ops;
yaffs_PackedTags1 pt1;
int retval;
/* we assume that PackedTags1 and yaffs_Tags are compatible */
compile_time_assertion(sizeof(yaffs_PackedTags1) == 12);
compile_time_assertion(sizeof(yaffs_Tags) == 8);
dev->nPageWrites++;
yaffs_PackTags1(&pt1, etags);
yaffs_CalcTagsECC((yaffs_Tags *)&pt1);
/* When deleting a chunk, the upper layer provides only skeletal
* etags, one with chunkDeleted set. However, we need to update the
* tags, not erase them completely. So we use the NAND write property
* that only zeroed-bits stick and set tag bytes to all-ones and
* zero just the (not) deleted bit.
*/
#ifndef CONFIG_YAFFS_9BYTE_TAGS
if (etags->chunkDeleted) {
memset(&pt1, 0xff, 8);
/* clear delete status bit to indicate deleted */
pt1.deleted = 0;
}
#else
((__u8 *)&pt1)[8] = 0xff;
if (etags->chunkDeleted) {
memset(&pt1, 0xff, 8);
/* zero pageStatus byte to indicate deleted */
((__u8 *)&pt1)[8] = 0;
}
#endif
memset(&ops, 0, sizeof(ops));
ops.mode = MTD_OOB_AUTO;
ops.len = (data) ? chunkBytes : 0;
ops.ooblen = YTAG1_SIZE;
ops.datbuf = (__u8 *)data;
ops.oobbuf = (__u8 *)&pt1;
retval = mtd->write_oob(mtd, addr, &ops);
if (retval) {
yaffs_trace(YAFFS_TRACE_MTD,
"write_oob failed, chunk %d, mtd error %d\n",
chunkInNAND, retval);
}
return retval ? YAFFS_FAIL : YAFFS_OK;
}
int nandmtd1_WriteChunkWithTagsToNAND(yaffs_Device *dev,
int chunkInNAND, const __u8 *data, const yaffs_ExtendedTags *etags)
{
struct mtd_info *mtd = dev->genericDevice;
int chunkBytes = dev->nDataBytesPerChunk;
loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
struct mtd_oob_ops ops;
yaffs_PackedTags1 pt1;
int retval;
compile_time_assertion(sizeof(yaffs_PackedTags1) == 12);
compile_time_assertion(sizeof(yaffs_Tags) == 8);
yaffs_PackTags1(&pt1, etags);
yaffs_CalcTagsECC((yaffs_Tags *)&pt1);
#ifndef CONFIG_YAFFS_9BYTE_TAGS
if (etags->chunkDeleted) {
memset(&pt1, 0xff, 8);
pt1.deleted = 0;
}
#else
((__u8 *)&pt1)[8] = 0xff;
if (etags->chunkDeleted) {
memset(&pt1, 0xff, 8);
((__u8 *)&pt1)[8] = 0;
}
#endif
memset(&ops, 0, sizeof(ops));
ops.mode = MTD_OOB_AUTO;
ops.len = (data) ? chunkBytes : 0;
ops.ooblen = YTAG1_SIZE;
ops.datbuf = (__u8 *)data;
ops.oobbuf = (__u8 *)&pt1;
retval = mtd->write_oob(mtd, addr, &ops);
if (retval) {
yaffs_trace(YAFFS_TRACE_MTD,
"write_oob failed, chunk %d, mtd error %d\n",
chunkInNAND, retval);
}
return retval ? YAFFS_FAIL : YAFFS_OK;
}
static void yaffs_LoadTagsIntoSpare(yaffs_Spare * sparePtr,
yaffs_Tags * tagsPtr)
{
yaffs_TagsUnion *tu = (yaffs_TagsUnion *) tagsPtr;
yaffs_CalcTagsECC(tagsPtr);
sparePtr->tagByte0 = tu->asBytes[0];
sparePtr->tagByte1 = tu->asBytes[1];
sparePtr->tagByte2 = tu->asBytes[2];
sparePtr->tagByte3 = tu->asBytes[3];
sparePtr->tagByte4 = tu->asBytes[4];
sparePtr->tagByte5 = tu->asBytes[5];
sparePtr->tagByte6 = tu->asBytes[6];
sparePtr->tagByte7 = tu->asBytes[7];
}
static void yaffs_LoadTagsIntoSpare(yaffs_Spare * sparePtr,
yaffs_Tags * tagsPtr)
{
printk("CALL [%s]\n", __FUNCTION__); //Ken
yaffs_TagsUnion *tu = (yaffs_TagsUnion *) tagsPtr;
yaffs_CalcTagsECC(tagsPtr);
sparePtr->tagByte0 = tu->asBytes[0];
sparePtr->tagByte1 = tu->asBytes[1];
sparePtr->tagByte2 = tu->asBytes[2];
sparePtr->tagByte3 = tu->asBytes[3];
sparePtr->tagByte4 = tu->asBytes[4];
sparePtr->tagByte5 = tu->asBytes[5];
sparePtr->tagByte6 = tu->asBytes[6];
sparePtr->tagByte7 = tu->asBytes[7];
}
