diff options
Diffstat (limited to 'target/linux/generic/files/fs/yaffs2/yaffs_tagscompat.c')
| -rw-r--r-- | target/linux/generic/files/fs/yaffs2/yaffs_tagscompat.c | 381 |
1 files changed, 0 insertions, 381 deletions
diff --git a/target/linux/generic/files/fs/yaffs2/yaffs_tagscompat.c b/target/linux/generic/files/fs/yaffs2/yaffs_tagscompat.c deleted file mode 100644 index 092430b..0000000 --- a/target/linux/generic/files/fs/yaffs2/yaffs_tagscompat.c +++ /dev/null @@ -1,381 +0,0 @@ -/* - * 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_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) -{ - int data_size = dev->data_bytes_per_chunk; - - return dev->drv.drv_write_chunk_fn(dev, nand_chunk, - data, data_size, - (u8 *) spare, sizeof(*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; - int data_size; - int spare_size; - int ecc_result1, ecc_result2; - u8 calc_ecc[3]; - - 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; - } - data_size = dev->data_bytes_per_chunk; - spare_size = sizeof(struct yaffs_spare); - - if (dev->param.use_nand_ecc) - return dev->drv.drv_read_chunk_fn(dev, nand_chunk, - data, data_size, - (u8 *) spare, spare_size, - ecc_result); - - - /* Handle the ECC at this level. */ - - ret_val = dev->drv.drv_read_chunk_fn(dev, nand_chunk, - data, data_size, - (u8 *)spare, spare_size, - NULL); - if (!data || !correct_errors) - return ret_val; - - /* Do ECC correction if needed. */ - 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; - - 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 - */ -} - -static 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_ecc_calc(data, spare.ecc1); - yaffs_ecc_calc(&data[256], spare.ecc2); - } - - yaffs_load_tags_to_spare(&spare, &tags); - } - return yaffs_wr_nand(dev, nand_chunk, data, &spare); -} - -static 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; -} - -static 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; -} - -static 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; - - /* Look for bad block markers in the first two chunks */ - yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block, - NULL, &spare0, &dummy, 0); - yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block + 1, - NULL, &spare1, &dummy, 0); - - 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; -} - -void yaffs_tags_compat_install(struct yaffs_dev *dev) -{ - if(dev->param.is_yaffs2) - return; - if(!dev->tagger.write_chunk_tags_fn) - dev->tagger.write_chunk_tags_fn = yaffs_tags_compat_wr; - if(!dev->tagger.read_chunk_tags_fn) - dev->tagger.read_chunk_tags_fn = yaffs_tags_compat_rd; - if(!dev->tagger.query_block_fn) - dev->tagger.query_block_fn = yaffs_tags_compat_query_block; - if(!dev->tagger.mark_bad_fn) - dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad; -} |