[people/ms/u-boot.git] / fs / yaffs2 / yaffs_tagscompat.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_guts.h"
#include "yaffs_tagscompat.h"
#include "yaffs_ecc.h"
#include "yaffs_getblockinfo.h"
#include "yaffs_trace.h"

static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk);


/********** Tags ECC calculations  *********/

void yaffs_calc_ecc(const u8 *data, struct yaffs_spare *spare)
{
	yaffs_ecc_calc(data, spare->ecc1);
	yaffs_ecc_calc(&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;
	unsigned bit = 0;

	tags->ecc = 0;

	for (i = 0; i < 8; i++) {
		for (j = 1; j & 0xff; j <<= 1) {
			bit++;
			if (b[i] & j)
				ecc ^= bit;
		}
	}
	tags->ecc = ecc;
}

int yaffs_check_tags_ecc(struct yaffs_tags *tags)
{
	unsigned ecc = tags->ecc;

	yaffs_calc_tags_ecc(tags);

	ecc ^= tags->ecc;

	if (ecc && ecc <= 64) {
		/* TODO: Handle the failure better. Retire? */
		unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes;

		ecc--;

		b[ecc / 8] ^= (1 << (ecc & 7));

		/* Now recvalc the ecc */
		yaffs_calc_tags_ecc(tags);

		return 1;	/* recovered error */
	} else if (ecc) {
		/* Wierd ecc failure value */
		/* TODO Need to do somethiong here */
		return -1;	/* unrecovered error */
	}
	return 0;
}

/********** Tags **********/

static void yaffs_load_tags_to_spare(struct yaffs_spare *spare_ptr,
				     struct yaffs_tags *tags_ptr)
{
	union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr;

	yaffs_calc_tags_ecc(tags_ptr);

	spare_ptr->tb0 = tu->as_bytes[0];
	spare_ptr->tb1 = tu->as_bytes[1];
	spare_ptr->tb2 = tu->as_bytes[2];
	spare_ptr->tb3 = tu->as_bytes[3];
	spare_ptr->tb4 = tu->as_bytes[4];
	spare_ptr->tb5 = tu->as_bytes[5];
	spare_ptr->tb6 = tu->as_bytes[6];
	spare_ptr->tb7 = tu->as_bytes[7];
}

static void yaffs_get_tags_from_spare(struct yaffs_dev *dev,
				      struct yaffs_spare *spare_ptr,
				      struct yaffs_tags *tags_ptr)
{
	union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr;
	int result;

	tu->as_bytes[0] = spare_ptr->tb0;
	tu->as_bytes[1] = spare_ptr->tb1;
	tu->as_bytes[2] = spare_ptr->tb2;
	tu->as_bytes[3] = spare_ptr->tb3;
	tu->as_bytes[4] = spare_ptr->tb4;
	tu->as_bytes[5] = spare_ptr->tb5;
	tu->as_bytes[6] = spare_ptr->tb6;
	tu->as_bytes[7] = spare_ptr->tb7;

	result = yaffs_check_tags_ecc(tags_ptr);
	if (result > 0)
		dev->n_tags_ecc_fixed++;
	else if (result < 0)
		dev->n_tags_ecc_unfixed++;
}

static void yaffs_spare_init(struct yaffs_spare *spare)
{
	memset(spare, 0xff, sizeof(struct yaffs_spare));
}

static int yaffs_wr_nand(struct yaffs_dev *dev,
			 int nand_chunk, const u8 *data,
			 struct yaffs_spare *spare)
{
	if (nand_chunk < dev->param.start_block * dev->param.chunks_per_block) {
		yaffs_trace(YAFFS_TRACE_ERROR,
			"**>> yaffs chunk %d is not valid",
			nand_chunk);
		return YAFFS_FAIL;
	}

	return dev->param.write_chunk_fn(dev, nand_chunk, data, spare);
}

static int yaffs_rd_chunk_nand(struct yaffs_dev *dev,
			       int nand_chunk,
			       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) {
		/* 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;
	}

	if (!dev->param.use_nand_ecc) {
		ret_val =
		    dev->param.read_chunk_fn(dev, nand_chunk, data, spare);
		if (data && correct_errors) {
			/* Do ECC correction */
			/* Todo handle any errors */
			int ecc_result1, ecc_result2;
			u8 calc_ecc[3];

			yaffs_ecc_calc(data, calc_ecc);
			ecc_result1 =
			    yaffs_ecc_correct(data, spare->ecc1, calc_ecc);
			yaffs_ecc_calc(&data[256], calc_ecc);
			ecc_result2 =
			    yaffs_ecc_correct(&data[256], spare->ecc2,
					      calc_ecc);

			if (ecc_result1 > 0) {
				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) {
				yaffs_trace(YAFFS_TRACE_ERROR,
					"**>>yaffs ecc error unfixed on chunk %d:0",
					nand_chunk);
				dev->n_ecc_unfixed++;
			}

			if (ecc_result2 > 0) {
				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) {
				yaffs_trace(YAFFS_TRACE_ERROR,
					"**>>yaffs ecc error unfixed on chunk %d:1",
					nand_chunk);
				dev->n_ecc_unfixed++;
			}

			if (ecc_result1 || ecc_result2) {
				/* We had a data problem on this page */
				yaffs_handle_rd_data_error(dev, nand_chunk);
			}

			if (ecc_result1 < 0 || ecc_result2 < 0)
				*ecc_result = YAFFS_ECC_RESULT_UNFIXED;
			else if (ecc_result1 > 0 || ecc_result2 > 0)
				*ecc_result = YAFFS_ECC_RESULT_FIXED;
			else
				*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
		}
	} else {
		/* Must allocate enough memory for spare+2*sizeof(int) */
		/* for ecc results from device. */
		struct yaffs_nand_spare nspare;

		memset(&nspare, 0, sizeof(nspare));

		ret_val = dev->param.read_chunk_fn(dev, nand_chunk, data,
						   (struct yaffs_spare *)
						   &nspare);
		memcpy(spare, &nspare, sizeof(struct yaffs_spare));
		if (data && correct_errors) {
			if (nspare.eccres1 > 0) {
				yaffs_trace(YAFFS_TRACE_ERROR,
					"**>>mtd ecc error fix performed on chunk %d:0",
					nand_chunk);
			} else if (nspare.eccres1 < 0) {
				yaffs_trace(YAFFS_TRACE_ERROR,
					"**>>mtd ecc error unfixed on chunk %d:0",
					nand_chunk);
			}

			if (nspare.eccres2 > 0) {
				yaffs_trace(YAFFS_TRACE_ERROR,
					"**>>mtd ecc error fix performed on chunk %d:1",
					nand_chunk);
			} else if (nspare.eccres2 < 0) {
				yaffs_trace(YAFFS_TRACE_ERROR,
					"**>>mtd ecc error unfixed on chunk %d:1",
					nand_chunk);
			}

			if (nspare.eccres1 || nspare.eccres2) {
				/* We had a data problem on this page */
				yaffs_handle_rd_data_error(dev, nand_chunk);
			}

			if (nspare.eccres1 < 0 || nspare.eccres2 < 0)
				*ecc_result = YAFFS_ECC_RESULT_UNFIXED;
			else if (nspare.eccres1 > 0 || nspare.eccres2 > 0)
				*ecc_result = YAFFS_ECC_RESULT_FIXED;
			else
				*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;

		}
	}
	return ret_val;
}

/*
 * Functions for robustisizing
 */

static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk)
{
	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;
	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
	 * then retire the block
	 * NB recursion
	 */
}

int yaffs_tags_compat_wr(struct yaffs_dev *dev,
			 int nand_chunk,
			 const u8 *data, const struct yaffs_ext_tags *ext_tags)
{
	struct yaffs_spare spare;
	struct yaffs_tags tags;

	yaffs_spare_init(&spare);

	if (ext_tags->is_deleted)
		spare.page_status = 0;
	else {
		tags.obj_id = ext_tags->obj_id;
		tags.chunk_id = ext_tags->chunk_id;

		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;
		else
			tags.n_bytes_msb = 3;

		tags.serial_number = ext_tags->serial_number;

		if (!dev->param.use_nand_ecc && data)
			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)
{
	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));
		init = 1;
	}

	if (!yaffs_rd_chunk_nand(dev, nand_chunk,
					data, &spare, &ecc_result, 1))
		return YAFFS_FAIL;

	/* ext_tags may be NULL */
	if (!ext_tags)
		return YAFFS_OK;

	deleted = (hweight8(spare.page_status) < 7) ? 1 : 0;

	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 (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;

		if (dev->data_bytes_per_chunk >= 1024)
			ext_tags->n_bytes |=
				(((unsigned)tags.n_bytes_msb) << 10);

		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));

	spare.block_status = 'Y';

	yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block, NULL,
		      &spare);
	yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block + 1,
		      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)
{
	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));
		init = 1;
	}

	*seq_number = 0;

	yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block, NULL,
			    &spare0, &dummy, 1);
	yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block + 1,
			    NULL, &spare1, &dummy, 1);

	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_SCAN;

	return YAFFS_OK;
}
Commit	Line	Data
0e8cc8bd WJ	1	/*
	2	* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
	3	*
753ac610	4	* Copyright (C) 2002-2011 Aleph One Ltd.
0e8cc8bd WJ	5	* for Toby Churchill Ltd and Brightstar Engineering
	6	*
	7	* Created by Charles Manning <charles@aleph1.co.uk>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include "yaffs_guts.h"
	15	#include "yaffs_tagscompat.h"
	16	#include "yaffs_ecc.h"
753ac610 CM	17	#include "yaffs_getblockinfo.h"
	18	#include "yaffs_trace.h"
	19
	20	static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk);
0e8cc8bd	21
0e8cc8bd WJ	22
	23	/******** Tags ECC calculations *******/
	24
753ac610	25	void yaffs_calc_ecc(const u8 data, struct yaffs_spare spare)
0e8cc8bd	26	{
753ac610 CM	27	yaffs_ecc_calc(data, spare->ecc1);
753ac610 CM	28	yaffs_ecc_calc(&data[256], spare->ecc2);
0e8cc8bd WJ	29	}
0e8cc8bd WJ	30
753ac610	31	void yaffs_calc_tags_ecc(struct yaffs_tags *tags)
0e8cc8bd WJ	32	{
0e8cc8bd WJ	33	/* Calculate an ecc */
753ac610	34	unsigned char b = ((union yaffs_tags_union )tags)->as_bytes;
0e8cc8bd WJ	35	unsigned i, j;
	36	unsigned ecc = 0;
	37	unsigned bit = 0;
	38
	39	tags->ecc = 0;
	40
	41	for (i = 0; i < 8; i++) {
	42	for (j = 1; j & 0xff; j <<= 1) {
	43	bit++;
753ac610	44	if (b[i] & j)
0e8cc8bd	45	ecc ^= bit;
0e8cc8bd WJ	46	}
0e8cc8bd WJ	47	}
0e8cc8bd	48	tags->ecc = ecc;
0e8cc8bd WJ	49	}
0e8cc8bd WJ	50
753ac610	51	int yaffs_check_tags_ecc(struct yaffs_tags *tags)
0e8cc8bd WJ	52	{
	53	unsigned ecc = tags->ecc;
	54
753ac610	55	yaffs_calc_tags_ecc(tags);
0e8cc8bd WJ	56
	57	ecc ^= tags->ecc;
	58
	59	if (ecc && ecc <= 64) {
	60	/* TODO: Handle the failure better. Retire? */
753ac610	61	unsigned char b = ((union yaffs_tags_union )tags)->as_bytes;
0e8cc8bd WJ	62
	63	ecc--;
	64
	65	b[ecc / 8] ^= (1 << (ecc & 7));
	66
	67	/* Now recvalc the ecc */
753ac610	68	yaffs_calc_tags_ecc(tags);
0e8cc8bd WJ	69
	70	return 1; /* recovered error */
	71	} else if (ecc) {
	72	/* Wierd ecc failure value */
	73	/* TODO Need to do somethiong here */
	74	return -1; /* unrecovered error */
	75	}
0e8cc8bd WJ	76	return 0;
	77	}
	78
	79	/******** Tags ********/
	80
753ac610 CM	81	static void yaffs_load_tags_to_spare(struct yaffs_spare *spare_ptr,
753ac610 CM	82	struct yaffs_tags *tags_ptr)
0e8cc8bd	83	{
753ac610 CM	84	union yaffs_tags_union tu = (union yaffs_tags_union )tags_ptr;
	85
	86	yaffs_calc_tags_ecc(tags_ptr);
	87
	88	spare_ptr->tb0 = tu->as_bytes[0];
	89	spare_ptr->tb1 = tu->as_bytes[1];
	90	spare_ptr->tb2 = tu->as_bytes[2];
	91	spare_ptr->tb3 = tu->as_bytes[3];
	92	spare_ptr->tb4 = tu->as_bytes[4];
	93	spare_ptr->tb5 = tu->as_bytes[5];
	94	spare_ptr->tb6 = tu->as_bytes[6];
	95	spare_ptr->tb7 = tu->as_bytes[7];
0e8cc8bd WJ	96	}
0e8cc8bd WJ	97
753ac610 CM	98	static void yaffs_get_tags_from_spare(struct yaffs_dev *dev,
	99	struct yaffs_spare *spare_ptr,
	100	struct yaffs_tags *tags_ptr)
0e8cc8bd	101	{
753ac610	102	union yaffs_tags_union tu = (union yaffs_tags_union )tags_ptr;
0e8cc8bd WJ	103	int result;
0e8cc8bd WJ	104
753ac610 CM	105	tu->as_bytes[0] = spare_ptr->tb0;
	106	tu->as_bytes[1] = spare_ptr->tb1;
	107	tu->as_bytes[2] = spare_ptr->tb2;
	108	tu->as_bytes[3] = spare_ptr->tb3;
	109	tu->as_bytes[4] = spare_ptr->tb4;
	110	tu->as_bytes[5] = spare_ptr->tb5;
	111	tu->as_bytes[6] = spare_ptr->tb6;
	112	tu->as_bytes[7] = spare_ptr->tb7;
	113
	114	result = yaffs_check_tags_ecc(tags_ptr);
	115	if (result > 0)
	116	dev->n_tags_ecc_fixed++;
	117	else if (result < 0)
	118	dev->n_tags_ecc_unfixed++;
0e8cc8bd WJ	119	}
0e8cc8bd WJ	120
753ac610	121	static void yaffs_spare_init(struct yaffs_spare *spare)
0e8cc8bd	122	{
753ac610	123	memset(spare, 0xff, sizeof(struct yaffs_spare));
0e8cc8bd WJ	124	}
0e8cc8bd WJ	125
753ac610 CM	126	static int yaffs_wr_nand(struct yaffs_dev *dev,
	127	int nand_chunk, const u8 *data,
	128	struct yaffs_spare *spare)
0e8cc8bd	129	{
753ac610 CM	130	if (nand_chunk < dev->param.start_block * dev->param.chunks_per_block) {
	131	yaffs_trace(YAFFS_TRACE_ERROR,
	132	"**>> yaffs chunk %d is not valid",
	133	nand_chunk);
0e8cc8bd WJ	134	return YAFFS_FAIL;
	135	}
	136
753ac610	137	return dev->param.write_chunk_fn(dev, nand_chunk, data, spare);
0e8cc8bd WJ	138	}
0e8cc8bd WJ	139
753ac610 CM	140	static int yaffs_rd_chunk_nand(struct yaffs_dev *dev,
	141	int nand_chunk,
	142	u8 *data,
	143	struct yaffs_spare *spare,
	144	enum yaffs_ecc_result *ecc_result,
	145	int correct_errors)
0e8cc8bd	146	{
753ac610 CM	147	int ret_val;
753ac610 CM	148	struct yaffs_spare local_spare;
0e8cc8bd	149
753ac610	150	if (!spare) {
0e8cc8bd WJ	151	/* If we don't have a real spare, then we use a local one. */
0e8cc8bd WJ	152	/* Need this for the calculation of the ecc */
753ac610	153	spare = &local_spare;
0e8cc8bd WJ	154	}
0e8cc8bd WJ	155
753ac610 CM	156	if (!dev->param.use_nand_ecc) {
	157	ret_val =
	158	dev->param.read_chunk_fn(dev, nand_chunk, data, spare);
	159	if (data && correct_errors) {
0e8cc8bd WJ	160	/* Do ECC correction */
0e8cc8bd WJ	161	/* Todo handle any errors */
753ac610 CM	162	int ecc_result1, ecc_result2;
	163	u8 calc_ecc[3];
	164
	165	yaffs_ecc_calc(data, calc_ecc);
	166	ecc_result1 =
	167	yaffs_ecc_correct(data, spare->ecc1, calc_ecc);
	168	yaffs_ecc_calc(&data[256], calc_ecc);
	169	ecc_result2 =
	170	yaffs_ecc_correct(&data[256], spare->ecc2,
	171	calc_ecc);
	172
	173	if (ecc_result1 > 0) {
	174	yaffs_trace(YAFFS_TRACE_ERROR,
	175	"**>>yaffs ecc error fix performed on chunk %d:0",
	176	nand_chunk);
	177	dev->n_ecc_fixed++;
	178	} else if (ecc_result1 < 0) {
	179	yaffs_trace(YAFFS_TRACE_ERROR,
	180	"**>>yaffs ecc error unfixed on chunk %d:0",
	181	nand_chunk);
	182	dev->n_ecc_unfixed++;
0e8cc8bd WJ	183	}
0e8cc8bd WJ	184
753ac610 CM	185	if (ecc_result2 > 0) {
	186	yaffs_trace(YAFFS_TRACE_ERROR,
	187	"**>>yaffs ecc error fix performed on chunk %d:1",
	188	nand_chunk);
	189	dev->n_ecc_fixed++;
	190	} else if (ecc_result2 < 0) {
	191	yaffs_trace(YAFFS_TRACE_ERROR,
	192	"**>>yaffs ecc error unfixed on chunk %d:1",
	193	nand_chunk);
	194	dev->n_ecc_unfixed++;
0e8cc8bd WJ	195	}
0e8cc8bd WJ	196
753ac610	197	if (ecc_result1 \|\| ecc_result2) {
0e8cc8bd	198	/* We had a data problem on this page */
753ac610	199	yaffs_handle_rd_data_error(dev, nand_chunk);
0e8cc8bd WJ	200	}
0e8cc8bd WJ	201
753ac610 CM	202	if (ecc_result1 < 0 \|\| ecc_result2 < 0)
	203	*ecc_result = YAFFS_ECC_RESULT_UNFIXED;
	204	else if (ecc_result1 > 0 \|\| ecc_result2 > 0)
	205	*ecc_result = YAFFS_ECC_RESULT_FIXED;
0e8cc8bd	206	else
753ac610	207	*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
0e8cc8bd WJ	208	}
	209	} else {
	210	/* Must allocate enough memory for spare+2sizeof(int) /
	211	/* for ecc results from device. */
753ac610 CM	212	struct yaffs_nand_spare nspare;
	213
	214	memset(&nspare, 0, sizeof(nspare));
	215
	216	ret_val = dev->param.read_chunk_fn(dev, nand_chunk, data,
	217	(struct yaffs_spare *)
	218	&nspare);
	219	memcpy(spare, &nspare, sizeof(struct yaffs_spare));
	220	if (data && correct_errors) {
0e8cc8bd	221	if (nspare.eccres1 > 0) {
753ac610 CM	222	yaffs_trace(YAFFS_TRACE_ERROR,
	223	"**>>mtd ecc error fix performed on chunk %d:0",
	224	nand_chunk);
0e8cc8bd	225	} else if (nspare.eccres1 < 0) {
753ac610 CM	226	yaffs_trace(YAFFS_TRACE_ERROR,
	227	"**>>mtd ecc error unfixed on chunk %d:0",
	228	nand_chunk);
0e8cc8bd WJ	229	}
	230
	231	if (nspare.eccres2 > 0) {
753ac610 CM	232	yaffs_trace(YAFFS_TRACE_ERROR,
	233	"**>>mtd ecc error fix performed on chunk %d:1",
	234	nand_chunk);
0e8cc8bd	235	} else if (nspare.eccres2 < 0) {
753ac610 CM	236	yaffs_trace(YAFFS_TRACE_ERROR,
	237	"**>>mtd ecc error unfixed on chunk %d:1",
	238	nand_chunk);
0e8cc8bd WJ	239	}
	240
	241	if (nspare.eccres1 \|\| nspare.eccres2) {
	242	/* We had a data problem on this page */
753ac610	243	yaffs_handle_rd_data_error(dev, nand_chunk);
0e8cc8bd WJ	244	}
	245
	246	if (nspare.eccres1 < 0 \|\| nspare.eccres2 < 0)
753ac610	247	*ecc_result = YAFFS_ECC_RESULT_UNFIXED;
0e8cc8bd	248	else if (nspare.eccres1 > 0 \|\| nspare.eccres2 > 0)
753ac610	249	*ecc_result = YAFFS_ECC_RESULT_FIXED;
0e8cc8bd	250	else
753ac610	251	*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
0e8cc8bd WJ	252
	253	}
	254	}
753ac610	255	return ret_val;
0e8cc8bd WJ	256	}
0e8cc8bd WJ	257
0e8cc8bd WJ	258	/*
	259	* Functions for robustisizing
	260	*/
	261
753ac610	262	static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk)
0e8cc8bd	263	{
753ac610	264	int flash_block = nand_chunk / dev->param.chunks_per_block;
0e8cc8bd WJ	265
0e8cc8bd WJ	266	/* Mark the block for retirement */
753ac610 CM	267	yaffs_get_block_info(dev, flash_block + dev->block_offset)->
	268	needs_retiring = 1;
	269	yaffs_trace(YAFFS_TRACE_ERROR \| YAFFS_TRACE_BAD_BLOCKS,
	270	"**>>Block %d marked for retirement",
	271	flash_block);
0e8cc8bd WJ	272
	273	/* TODO:
	274	* Just do a garbage collection on the affected block
	275	* then retire the block
	276	* NB recursion
	277	*/
	278	}
	279
753ac610 CM	280	int yaffs_tags_compat_wr(struct yaffs_dev *dev,
	281	int nand_chunk,
	282	const u8 data, const struct yaffs_ext_tags ext_tags)
0e8cc8bd	283	{
753ac610 CM	284	struct yaffs_spare spare;
753ac610 CM	285	struct yaffs_tags tags;
0e8cc8bd	286
753ac610	287	yaffs_spare_init(&spare);
0e8cc8bd	288
753ac610 CM	289	if (ext_tags->is_deleted)
	290	spare.page_status = 0;
	291	else {
	292	tags.obj_id = ext_tags->obj_id;
	293	tags.chunk_id = ext_tags->chunk_id;
0e8cc8bd	294
753ac610	295	tags.n_bytes_lsb = ext_tags->n_bytes & (1024 - 1);
0e8cc8bd	296
753ac610 CM	297	if (dev->data_bytes_per_chunk >= 1024)
	298	tags.n_bytes_msb = (ext_tags->n_bytes >> 10) & 3;
	299	else
	300	tags.n_bytes_msb = 3;
0e8cc8bd	301
753ac610	302	tags.serial_number = ext_tags->serial_number;
0e8cc8bd	303
753ac610 CM	304	if (!dev->param.use_nand_ecc && data)
753ac610 CM	305	yaffs_calc_ecc(data, &spare);
0e8cc8bd	306
753ac610	307	yaffs_load_tags_to_spare(&spare, &tags);
0e8cc8bd	308	}
753ac610	309	return yaffs_wr_nand(dev, nand_chunk, data, &spare);
0e8cc8bd WJ	310	}
0e8cc8bd WJ	311
753ac610 CM	312	int yaffs_tags_compat_rd(struct yaffs_dev *dev,
	313	int nand_chunk,
	314	u8 data, struct yaffs_ext_tags ext_tags)
0e8cc8bd	315	{
753ac610 CM	316	struct yaffs_spare spare;
	317	struct yaffs_tags tags;
	318	enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
	319	static struct yaffs_spare spare_ff;
0e8cc8bd	320	static int init;
753ac610	321	int deleted;
0e8cc8bd WJ	322
0e8cc8bd WJ	323	if (!init) {
753ac610	324	memset(&spare_ff, 0xff, sizeof(spare_ff));
0e8cc8bd WJ	325	init = 1;
	326	}
	327
753ac610 CM	328	if (!yaffs_rd_chunk_nand(dev, nand_chunk,
	329	data, &spare, &ecc_result, 1))
	330	return YAFFS_FAIL;
0e8cc8bd	331
753ac610 CM	332	/* ext_tags may be NULL */
753ac610 CM	333	if (!ext_tags)
0e8cc8bd	334	return YAFFS_OK;
753ac610 CM	335
	336	deleted = (hweight8(spare.page_status) < 7) ? 1 : 0;
	337
	338	ext_tags->is_deleted = deleted;
	339	ext_tags->ecc_result = ecc_result;
	340	ext_tags->block_bad = 0; /* We're reading it */
	341	/* therefore it is not a bad block */
	342	ext_tags->chunk_used =
	343	memcmp(&spare_ff, &spare, sizeof(spare_ff)) ? 1 : 0;
	344
	345	if (ext_tags->chunk_used) {
	346	yaffs_get_tags_from_spare(dev, &spare, &tags);
	347	ext_tags->obj_id = tags.obj_id;
	348	ext_tags->chunk_id = tags.chunk_id;
	349	ext_tags->n_bytes = tags.n_bytes_lsb;
	350
	351	if (dev->data_bytes_per_chunk >= 1024)
	352	ext_tags->n_bytes \|=
	353	(((unsigned)tags.n_bytes_msb) << 10);
	354
	355	ext_tags->serial_number = tags.serial_number;
0e8cc8bd	356	}
753ac610 CM	357
753ac610 CM	358	return YAFFS_OK;
0e8cc8bd WJ	359	}
0e8cc8bd WJ	360
753ac610	361	int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int flash_block)
0e8cc8bd	362	{
753ac610	363	struct yaffs_spare spare;
0e8cc8bd	364
753ac610	365	memset(&spare, 0xff, sizeof(struct yaffs_spare));
0e8cc8bd	366
753ac610	367	spare.block_status = 'Y';
0e8cc8bd	368
753ac610 CM	369	yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block, NULL,
	370	&spare);
	371	yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block + 1,
	372	NULL, &spare);
0e8cc8bd WJ	373
0e8cc8bd WJ	374	return YAFFS_OK;
0e8cc8bd WJ	375	}
0e8cc8bd WJ	376
753ac610 CM	377	int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
	378	int block_no,
	379	enum yaffs_block_state *state,
	380	u32 *seq_number)
0e8cc8bd	381	{
753ac610 CM	382	struct yaffs_spare spare0, spare1;
753ac610 CM	383	static struct yaffs_spare spare_ff;
0e8cc8bd	384	static int init;
753ac610	385	enum yaffs_ecc_result dummy;
0e8cc8bd WJ	386
0e8cc8bd WJ	387	if (!init) {
753ac610	388	memset(&spare_ff, 0xff, sizeof(spare_ff));
0e8cc8bd WJ	389	init = 1;
	390	}
	391
753ac610	392	*seq_number = 0;
0e8cc8bd	393
753ac610 CM	394	yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block, NULL,
	395	&spare0, &dummy, 1);
	396	yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block + 1,
	397	NULL, &spare1, &dummy, 1);
0e8cc8bd	398
753ac610	399	if (hweight8(spare0.block_status & spare1.block_status) < 7)
0e8cc8bd	400	*state = YAFFS_BLOCK_STATE_DEAD;
753ac610	401	else if (memcmp(&spare_ff, &spare0, sizeof(spare_ff)) == 0)
0e8cc8bd WJ	402	*state = YAFFS_BLOCK_STATE_EMPTY;
0e8cc8bd WJ	403	else
753ac610	404	*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
0e8cc8bd WJ	405
	406	return YAFFS_OK;
	407	}