diff options
Diffstat (limited to 'target')
4 files changed, 2361 insertions, 4 deletions
diff --git a/target/linux/generic/files/drivers/mtd/nand/mtk_bmt.c b/target/linux/generic/files/drivers/mtd/nand/mtk_bmt.c index f79a51526d..6e7b6bb5f9 100644 --- a/target/linux/generic/files/drivers/mtd/nand/mtk_bmt.c +++ b/target/linux/generic/files/drivers/mtd/nand/mtk_bmt.c @@ -392,6 +392,8 @@ int mtk_bmt_attach(struct mtd_info *mtd) if (of_property_read_bool(np, "mediatek,bmt-v2")) bmtd.ops = &mtk_bmt_v2_ops; + else if (of_property_read_bool(np, "mediatek,nmbm")) + bmtd.ops = &mtk_bmt_nmbm_ops; else if (of_property_read_bool(np, "mediatek,bbt")) bmtd.ops = &mtk_bmt_bbt_ops; else @@ -410,14 +412,14 @@ int mtk_bmt_attach(struct mtd_info *mtd) bmtd.pg_shift = ffs(bmtd.pg_size) - 1; bmtd.total_blks = mtd->size >> bmtd.blk_shift; - bmtd.data_buf = kzalloc(bmtd.pg_size, GFP_KERNEL); + bmtd.data_buf = kzalloc(bmtd.pg_size + bmtd.mtd->oobsize, GFP_KERNEL); if (!bmtd.data_buf) { pr_info("nand: FATAL ERR: allocate buffer failed!\n"); ret = -1; goto error; } - memset(bmtd.data_buf, 0xff, bmtd.pg_size); + memset(bmtd.data_buf, 0xff, bmtd.pg_size + bmtd.mtd->oobsize); ret = bmtd.ops->init(np); if (ret) diff --git a/target/linux/generic/files/drivers/mtd/nand/mtk_bmt.h b/target/linux/generic/files/drivers/mtd/nand/mtk_bmt.h index cea23f9207..dff1f28c81 100644 --- a/target/linux/generic/files/drivers/mtd/nand/mtk_bmt.h +++ b/target/linux/generic/files/drivers/mtd/nand/mtk_bmt.h @@ -23,6 +23,9 @@ struct mtk_bmt_ops { int (*debug)(void *data, u64 val); }; +struct bbbt; +struct nmbm_instance; + struct bmt_desc { struct mtd_info *mtd; unsigned char *bbt_buf; @@ -38,7 +41,10 @@ struct bmt_desc { const struct mtk_bmt_ops *ops; - struct bbbt *bbt; + union { + struct bbbt *bbt; + struct nmbm_instance *ni; + }; struct dentry *debugfs_dir; @@ -70,6 +76,7 @@ struct bmt_desc { extern struct bmt_desc bmtd; extern const struct mtk_bmt_ops mtk_bmt_v2_ops; extern const struct mtk_bmt_ops mtk_bmt_bbt_ops; +extern const struct mtk_bmt_ops mtk_bmt_nmbm_ops; static inline u32 blk_pg(u16 block) { diff --git a/target/linux/generic/files/drivers/mtd/nand/mtk_bmt_nmbm.c b/target/linux/generic/files/drivers/mtd/nand/mtk_bmt_nmbm.c new file mode 100644 index 0000000000..a896e49ec0 --- /dev/null +++ b/target/linux/generic/files/drivers/mtd/nand/mtk_bmt_nmbm.c @@ -0,0 +1,2348 @@ +#include <linux/crc32.h> +#include <linux/slab.h> +#include "mtk_bmt.h" + +#define nlog_err(ni, ...) printk(KERN_ERR __VA_ARGS__) +#define nlog_info(ni, ...) printk(KERN_INFO __VA_ARGS__) +#define nlog_debug(ni, ...) printk(KERN_INFO __VA_ARGS__) +#define nlog_warn(ni, ...) printk(KERN_WARNING __VA_ARGS__) + +#define NMBM_MAGIC_SIGNATURE 0x304d4d4e /* NMM0 */ +#define NMBM_MAGIC_INFO_TABLE 0x314d4d4e /* NMM1 */ + +#define NMBM_VERSION_MAJOR_S 0 +#define NMBM_VERSION_MAJOR_M 0xffff +#define NMBM_VERSION_MINOR_S 16 +#define NMBM_VERSION_MINOR_M 0xffff +#define NMBM_VERSION_MAKE(major, minor) (((major) & NMBM_VERSION_MAJOR_M) | \ + (((minor) & NMBM_VERSION_MINOR_M) << \ + NMBM_VERSION_MINOR_S)) +#define NMBM_VERSION_MAJOR_GET(ver) (((ver) >> NMBM_VERSION_MAJOR_S) & \ + NMBM_VERSION_MAJOR_M) +#define NMBM_VERSION_MINOR_GET(ver) (((ver) >> NMBM_VERSION_MINOR_S) & \ + NMBM_VERSION_MINOR_M) + +#define NMBM_BITMAP_UNIT_SIZE (sizeof(u32)) +#define NMBM_BITMAP_BITS_PER_BLOCK 2 +#define NMBM_BITMAP_BITS_PER_UNIT (8 * sizeof(u32)) +#define NMBM_BITMAP_BLOCKS_PER_UNIT (NMBM_BITMAP_BITS_PER_UNIT / \ + NMBM_BITMAP_BITS_PER_BLOCK) + +#define NMBM_SPARE_BLOCK_MULTI 1 +#define NMBM_SPARE_BLOCK_DIV 2 +#define NMBM_SPARE_BLOCK_MIN 2 + +#define NMBM_MGMT_DIV 16 +#define NMBM_MGMT_BLOCKS_MIN 32 + +#define NMBM_TRY_COUNT 3 + +#define BLOCK_ST_BAD 0 +#define BLOCK_ST_NEED_REMAP 2 +#define BLOCK_ST_GOOD 3 +#define BLOCK_ST_MASK 3 + +#define NMBM_VER_MAJOR 1 +#define NMBM_VER_MINOR 0 +#define NMBM_VER NMBM_VERSION_MAKE(NMBM_VER_MAJOR, \ + NMBM_VER_MINOR) + +struct nmbm_header { + u32 magic; + u32 version; + u32 size; + u32 checksum; +}; + +struct nmbm_signature { + struct nmbm_header header; + uint64_t nand_size; + u32 block_size; + u32 page_size; + u32 spare_size; + u32 mgmt_start_pb; + u8 max_try_count; + u8 padding[3]; +}; + +struct nmbm_info_table_header { + struct nmbm_header header; + u32 write_count; + u32 state_table_off; + u32 mapping_table_off; + u32 padding; +}; + +struct nmbm_instance { + u32 rawpage_size; + u32 rawblock_size; + u32 rawchip_size; + + struct nmbm_signature signature; + + u8 *info_table_cache; + u32 info_table_size; + u32 info_table_spare_blocks; + struct nmbm_info_table_header info_table; + + u32 *block_state; + u32 block_state_changed; + u32 state_table_size; + + int32_t *block_mapping; + u32 block_mapping_changed; + u32 mapping_table_size; + + u8 *page_cache; + + int protected; + + u32 block_count; + u32 data_block_count; + + u32 mgmt_start_ba; + u32 main_table_ba; + u32 backup_table_ba; + u32 mapping_blocks_ba; + u32 mapping_blocks_top_ba; + u32 signature_ba; + + u32 max_ratio; + u32 max_reserved_blocks; + bool empty_page_ecc_ok; + bool force_create; +}; + +static inline u32 nmbm_crc32(u32 crcval, const void *buf, size_t size) +{ + unsigned int chksz; + const unsigned char *p = buf; + + while (size) { + if (size > UINT_MAX) + chksz = UINT_MAX; + else + chksz = (uint)size; + + crcval = crc32_le(crcval, p, chksz); + size -= chksz; + p += chksz; + } + + return crcval; +} +/* + * nlog_table_creation - Print log of table creation event + * @ni: NMBM instance structure + * @main_table: whether the table is main info table + * @start_ba: start block address of the table + * @end_ba: block address after the end of the table + */ +static void nlog_table_creation(struct nmbm_instance *ni, bool main_table, + uint32_t start_ba, uint32_t end_ba) +{ + if (start_ba == end_ba - 1) + nlog_info(ni, "%s info table has been written to block %u\n", + main_table ? "Main" : "Backup", start_ba); + else + nlog_info(ni, "%s info table has been written to block %u-%u\n", + main_table ? "Main" : "Backup", start_ba, end_ba - 1); +} + +/* + * nlog_table_update - Print log of table update event + * @ni: NMBM instance structure + * @main_table: whether the table is main info table + * @start_ba: start block address of the table + * @end_ba: block address after the end of the table + */ +static void nlog_table_update(struct nmbm_instance *ni, bool main_table, + uint32_t start_ba, uint32_t end_ba) +{ + if (start_ba == end_ba - 1) + nlog_debug(ni, "%s info table has been updated in block %u\n", + main_table ? "Main" : "Backup", start_ba); + else + nlog_debug(ni, "%s info table has been updated in block %u-%u\n", + main_table ? "Main" : "Backup", start_ba, end_ba - 1); +} + +/* + * nlog_table_found - Print log of table found event + * @ni: NMBM instance structure + * @first_table: whether the table is first found info table + * @write_count: write count of the info table + * @start_ba: start block address of the table + * @end_ba: block address after the end of the table + */ +static void nlog_table_found(struct nmbm_instance *ni, bool first_table, + uint32_t write_count, uint32_t start_ba, + uint32_t end_ba) +{ + if (start_ba == end_ba - 1) + nlog_info(ni, "%s info table with writecount %u found in block %u\n", + first_table ? "First" : "Second", write_count, + start_ba); + else + nlog_info(ni, "%s info table with writecount %u found in block %u-%u\n", + first_table ? "First" : "Second", write_count, + start_ba, end_ba - 1); +} + +/*****************************************************************************/ +/* Address conversion functions */ +/*****************************************************************************/ + +/* + * ba2addr - Convert a block address to linear address + * @ni: NMBM instance structure + * @ba: Block address + */ +static uint64_t ba2addr(struct nmbm_instance *ni, uint32_t ba) +{ + return (uint64_t)ba << bmtd.blk_shift; +} +/* + * size2blk - Get minimum required blocks for storing specific size of data + * @ni: NMBM instance structure + * @size: size for storing + */ +static uint32_t size2blk(struct nmbm_instance *ni, uint64_t size) +{ + return (size + bmtd.blk_size - 1) >> bmtd.blk_shift; +} + +/*****************************************************************************/ +/* High level NAND chip APIs */ +/*****************************************************************************/ + +/* + * nmbm_read_phys_page - Read page with retry + * @ni: NMBM instance structure + * @addr: linear address where the data will be read from + * @data: the main data to be read + * @oob: the oob data to be read + * + * Read a page for at most NMBM_TRY_COUNT times. + * + * Return 0 for success, positive value for corrected bitflip count, + * -EBADMSG for ecc error, other negative values for other errors + */ +static int nmbm_read_phys_page(struct nmbm_instance *ni, uint64_t addr, + void *data, void *oob) +{ + int tries, ret; + + for (tries = 0; tries < NMBM_TRY_COUNT; tries++) { + struct mtd_oob_ops ops = { + .mode = MTD_OPS_PLACE_OOB, + .oobbuf = oob, + .datbuf = data, + }; + + if (data) + ops.len = bmtd.pg_size; + if (oob) + ops.ooblen = mtd_oobavail(bmtd.mtd, &ops); + + ret = bmtd._read_oob(bmtd.mtd, addr, &ops); + if (ret == -EUCLEAN) + return min_t(u32, bmtd.mtd->bitflip_threshold + 1, + bmtd.mtd->ecc_strength); + if (ret >= 0) + return 0; + } + + if (ret != -EBADMSG) + nlog_err(ni, "Page read failed at address 0x%08llx\n", addr); + + return ret; +} + +/* + * nmbm_write_phys_page - Write page with retry + * @ni: NMBM instance structure + * @addr: linear address where the data will be written to + * @data: the main data to be written + * @oob: the oob data to be written + * + * Write a page for at most NMBM_TRY_COUNT times. + */ +static bool nmbm_write_phys_page(struct nmbm_instance *ni, uint64_t addr, + const void *data, const void *oob) +{ + int tries, ret; + + for (tries = 0; tries < NMBM_TRY_COUNT; tries++) { + struct mtd_oob_ops ops = { + .mode = MTD_OPS_PLACE_OOB, + .oobbuf = (void *)oob, + .datbuf = (void *)data, + }; + + if (data) + ops.len = bmtd.pg_size; + if (oob) + ops.ooblen = mtd_oobavail(bmtd.mtd, &ops); + + ret = bmtd._write_oob(bmtd.mtd, addr, &ops); + if (!ret) + return true; + } + + nlog_err(ni, "Page write failed at address 0x%08llx\n", addr); + + return false; +} + +/* + * nmbm_erase_phys_block - Erase a block with retry + * @ni: NMBM instance structure + * @addr: Linear address + * + * Erase a block for at most NMBM_TRY_COUNT times. + */ +static bool nmbm_erase_phys_block(struct nmbm_instance *ni, uint64_t addr) +{ + int tries, ret; + + for (tries = 0; tries < NMBM_TRY_COUNT; tries++) { + struct erase_info ei = { + .addr = addr, + .len = bmtd.mtd->erasesize, + }; + + ret = bmtd._erase(bmtd.mtd, &ei); + if (!ret) + return true; + } + + nlog_err(ni, "Block erasure failed at address 0x%08llx\n", addr); + + return false; +} + +/* + * nmbm_check_bad_phys_block - Check whether a block is marked bad in OOB + * @ni: NMBM instance structure + * @ba: block address + */ +static bool nmbm_check_bad_phys_block(struct nmbm_instance *ni, uint32_t ba) +{ + uint64_t addr = ba2addr(ni, ba); + + return bmtd._block_isbad(bmtd.mtd, addr); +} + +/* + * nmbm_mark_phys_bad_block - Mark a block bad + * @ni: NMBM instance structure + * @addr: Linear address + */ +static int nmbm_mark_phys_bad_block(struct nmbm_instance *ni, uint32_t ba) +{ + uint64_t addr = ba2addr(ni, ba); + + nlog_info(ni, "Block %u [0x%08llx] will be marked bad\n", ba, addr); + + return bmtd._block_markbad(bmtd.mtd, addr); +} + +/*****************************************************************************/ +/* NMBM related functions */ +/*****************************************************************************/ + +/* + * nmbm_check_header - Check whether a NMBM structure is valid + * @data: pointer to a NMBM structure with a NMBM header at beginning + * @size: Size of the buffer pointed by @header + * + * The size of the NMBM structure may be larger than NMBM header, + * e.g. block mapping table and block state table. + */ +static bool nmbm_check_header(const void *data, uint32_t size) +{ + const struct nmbm_header *header = data; + struct nmbm_header nhdr; + uint32_t new_checksum; + + /* + * Make sure expected structure size is equal or smaller than + * buffer size. + */ + if (header->size > size) + return false; + + memcpy(&nhdr, data, sizeof(nhdr)); + + nhdr.checksum = 0; + new_checksum = nmbm_crc32(0, &nhdr, sizeof(nhdr)); + if (header->size > sizeof(nhdr)) + new_checksum = nmbm_crc32(new_checksum, + (const uint8_t *)data + sizeof(nhdr), + header->size - sizeof(nhdr)); + + if (header->checksum != new_checksum) + return false; + + return true; +} + +/* + * nmbm_update_checksum - Update checksum of a NMBM structure + * @header: pointer to a NMBM structure with a NMBM header at beginning + * + * The size of the NMBM structure must be specified by @header->size + */ +static void nmbm_update_checksum(struct nmbm_header *header) +{ + header->checksum = 0; + header->checksum = nmbm_crc32(0, header, header->size); +} + +/* + * nmbm_get_spare_block_count - Calculate number of blocks should be reserved + * @block_count: number of blocks of data + * + * Calculate number of blocks should be reserved for data + */ +static uint32_t nmbm_get_spare_block_count(uint32_t block_count) +{ + uint32_t val; + + val = (block_count + NMBM_SPARE_BLOCK_DIV / 2) / NMBM_SPARE_BLOCK_DIV; + val *= NMBM_SPARE_BLOCK_MULTI; + + if (val < NMBM_SPARE_BLOCK_MIN) + val = NMBM_SPARE_BLOCK_MIN; + + return val; +} + +/* + * nmbm_get_block_state_raw - Get state of a block from raw block state table + * @block_state: pointer to raw block state table (bitmap) + * @ba: block address + */ +static uint32_t nmbm_get_block_state_raw(u32 *block_state, + uint32_t ba) +{ + uint32_t unit, shift; + + unit = ba / NMBM_BITMAP_BLOCKS_PER_UNIT; + shift = (ba % NMBM_BITMAP_BLOCKS_PER_UNIT) * NMBM_BITMAP_BITS_PER_BLOCK; + + return (block_state[unit] >> shift) & BLOCK_ST_MASK; +} + +/* + * nmbm_get_block_state - Get state of a block from block state table + * @ni: NMBM instance structure + * @ba: block address + */ +static uint32_t nmbm_get_block_state(struct nmbm_instance *ni, uint32_t ba) +{ + return nmbm_get_block_state_raw(ni->block_state, ba); +} + +/* + * nmbm_set_block_state - Set state of a block to block state table + * @ni: NMBM instance structure + * @ba: block address + * @state: block state + * + * Set state of a block. If the block state changed, ni->block_state_changed + * will be increased. + */ +static bool nmbm_set_block_state(struct nmbm_instance *ni, uint32_t ba, + uint32_t state) +{ + uint32_t unit, shift, orig; + u32 uv; + + unit = ba / NMBM_BITMAP_BLOCKS_PER_UNIT; + shift = (ba % NMBM_BITMAP_BLOCKS_PER_UNIT) * NMBM_BITMAP_BITS_PER_BLOCK; + + orig = (ni->block_state[unit] >> shift) & BLOCK_ST_MASK; + state &= BLOCK_ST_MASK; + + uv = ni->block_state[unit] & (~(BLOCK_ST_MASK << shift)); + uv |= state << shift; + ni->block_state[unit] = uv; + + if (orig != state) { + ni->block_state_changed++; + return true; + } + + return false; +} + +/* + * nmbm_block_walk_asc - Skip specified number of good blocks, ascending addr. + * @ni: NMBM instance structure + * @ba: start physical block address + * @nba: return physical block address after walk + * @count: number of good blocks to be skipped + * @limit: highest block address allowed for walking + * + * Start from @ba, skipping any bad blocks, counting @count good blocks, and + * return the next good block address. + * + * If no enough good blocks counted while @limit reached, false will be returned. + * + * If @count == 0, nearest good block address will be returned. + * @limit is not counted in walking. + */ +static bool nmbm_block_walk_asc(struct nmbm_instance *ni, uint32_t ba, + uint32_t *nba, uint32_t count, + uint32_t limit) +{ + int32_t nblock = count; + + if (limit >= ni->block_count) + limit = ni->block_count - 1; + + while (ba < limit) { + if (nmbm_get_block_state(ni, ba) == BLOCK_ST_GOOD) + nblock--; + + if (nblock < 0) { + *nba = ba; + return true; + } + + ba++; + } + + return false; +} + +/* + * nmbm_block_walk_desc - Skip specified number of good blocks, descending addr + * @ni: NMBM instance structure + * @ba: start physical block address + * @nba: return physical block address after walk + * @count: number of good blocks to be skipped + * @limit: lowest block address allowed for walking + * + * Start from @ba, skipping any bad blocks, counting @count good blocks, and + * return the next good block address. + * + * If no enough good blocks counted while @limit reached, false will be returned. + * + * If @count == 0, nearest good block address will be returned. + * @limit is not counted in walking. + */ +static bool nmbm_block_walk_desc(struct nmbm_instance *ni, uint32_t ba, + uint32_t *nba, uint32_t count, uint32_t limit) +{ + int32_t nblock = count; + + if (limit >= ni->block_count) + limit = ni->block_count - 1; + + while (ba > limit) { + if (nmbm_get_block_state(ni, ba) == BLOCK_ST_GOOD) + nblock--; + + if (nblock < 0) { + *nba = ba; + return true; + } + + ba--; + } + + return false; +} + +/* + * nmbm_block_walk - Skip specified number of good blocks from curr. block addr + * @ni: NMBM instance structure + * @ascending: whether to walk ascending + * @ba: start physical block address + * @nba: return physical block address after walk + * @count: number of good blocks to be skipped + * @limit: highest/lowest block address allowed for walking + * + * Start from @ba, skipping any bad blocks, counting @count good blocks, and + * return the next good block address. + * + * If no enough good blocks counted while @limit reached, false will be returned. + * + * If @count == 0, nearest good block address will be returned. + * @limit can be set to negative if no limit required. + * @limit is not counted in walking. + */ +static bool nmbm_block_walk(struct nmbm_instance *ni, bool ascending, + uint32_t ba, uint32_t *nba, int32_t count, + int32_t limit) +{ + if (ascending) + return nmbm_block_walk_asc(ni, ba, nba, count, limit); + + return nmbm_block_walk_desc(ni, ba, nba, count, limit); +} + +/* + * nmbm_scan_badblocks - Scan and record all bad blocks + * @ni: NMBM instance structure + * + * Scan the entire lower NAND chip and record all bad blocks in to block state + * table. + */ +static void nmbm_scan_badblocks(struct nmbm_instance *ni) +{ + uint32_t ba; + + for (ba = 0; ba < ni->block_count; ba++) { + if (nmbm_check_bad_phys_block(ni, ba)) { + nmbm_set_block_state(ni, ba, BLOCK_ST_BAD); + nlog_info(ni, "Bad block %u [0x%08llx]\n", ba, + ba2addr(ni, ba)); + } + } +} + +/* + * nmbm_build_mapping_table - Build initial block mapping table + * @ni: NMBM instance structure + * + * The initial mapping table will be compatible with the stratage of + * factory production. + */ +static void nmbm_build_mapping_table(struct nmbm_instance *ni) +{ + uint32_t pb, lb; + + for (pb = 0, lb = 0; pb < ni->mgmt_start_ba; pb++) { + if (nmbm_get_block_state(ni, pb) == BLOCK_ST_BAD) + continue; + + /* Always map to the next good block */ + ni->block_mapping[lb++] = pb; + } + + ni->data_block_count = lb; + + /* Unusable/Management blocks */ + for (pb = lb; pb < ni->block_count; pb++) + ni->block_mapping[pb] = -1; +} + +/* + * nmbm_erase_block_and_check - Erase a block and check its usability + * @ni: NMBM instance structure + * @ba: block address to be erased + * + * Erase a block anc check its usability + * + * Return true if the block is usable, false if erasure failure or the block + * has too many bitflips. + */ +static bool nmbm_erase_block_and_check(struct nmbm_instance *ni, uint32_t ba) +{ + uint64_t addr, off; + bool success; + int ret; + + success = nmbm_erase_phys_block(ni, ba2addr(ni, ba)); + if (!success) + return false; + + if (!ni->empty_page_ecc_ok) + return true; + + /* Check every page to make sure there aren't too many bitflips */ + + addr = ba2addr(ni, ba); + + for (off = 0; off < bmtd.blk_size; off += bmtd.pg_size) { + ret = nmbm_read_phys_page(ni, addr + off, ni->page_cache, NULL); + if (ret == -EBADMSG) { + /* + * empty_page_ecc_ok means the empty page is + * still protected by ECC. So reading pages with ECC + * enabled and -EBADMSG means there are too many + * bitflips that can't be recovered, and the block + * containing the page should be marked bad. + */ + nlog_err(ni, + "Too many bitflips in empty page at 0x%llx\n", + addr + off); + return false; + } + } + + return true; +} + +/* + * nmbm_erase_range - Erase a range of blocks + * @ni: NMBM instance structure + * @ba: block address where the erasure will start + * @limit: top block address allowed for erasure + * + * Erase blocks within the specific range. Newly-found bad blocks will be + * marked. + * + * @limit is not counted into the allowed erasure address. + */ +static void nmbm_erase_range(struct nmbm_instance *ni, uint32_t ba, + uint32_t limit) +{ + bool success; + + while (ba < limit) { + if (nmbm_get_block_state(ni, ba) != BLOCK_ST_GOOD) + goto next_block; + + /* Insurance to detect unexpected bad block marked by user */ + if (nmbm_check_bad_phys_block(ni, ba)) { + nmbm_set_block_state(ni, ba, BLOCK_ST_BAD); + goto next_block; + } + + success = nmbm_erase_block_and_check(ni, ba); + if (success) + goto next_block; + + nmbm_mark_phys_bad_block(ni, ba); + nmbm_set_block_state(ni, ba, BLOCK_ST_BAD); + + next_block: + ba++; + } +} + +/* + * nmbm_write_repeated_data - Write critical data to a block with retry + * @ni: NMBM instance structure + * @ba: block address where the data will be written to + * @data: the data to be written + * @size: size of the data + * + * Write data to every page of the block. Success only if all pages within + * this block have been successfully written. + * + * Make sure data size is not bigger than one page. + * + * This function will write and verify every page for at most + * NMBM_TRY_COUNT times. + */ +static bool nmbm_write_repeated_data(struct nmbm_instance *ni, uint32_t ba, + const void *data, uint32_t size) +{ + uint64_t addr, off; + bool success; + int ret; + + if (size > bmtd.pg_size) + return false; + + addr = ba2addr(ni, ba); + + for (off = 0; off < bmtd.blk_size; off += bmtd.pg_size) { + /* Prepare page data. fill 0xff to unused region */ + memcpy(ni->page_cache, data, size); + memset(ni->page_cache + size, 0xff, ni->rawpage_size - size); + + success = nmbm_write_phys_page(ni, addr + off, ni->page_cache, NULL); + if (!success) + return false; + + /* Verify the data just written. ECC error indicates failure */ + ret = nmbm_read_phys_page(ni, addr + off, ni->page_cache, NULL); + if (ret < 0) + return false; + + if (memcmp(ni->page_cache, data, size)) + return false; + } + + return true; +} + +/* + * nmbm_write_signature - Write signature to NAND chip + * @ni: NMBM instance structure + * @limit: top block address allowed for writing + * @signature: the signature to be written + * @signature_ba: the actual block address where signature is written to + * + * Write signature within a specific range, from chip bottom to limit. + * At most one block will be written. + * + * @limit is not counted into the allowed write address. + */ +static bool nmbm_write_signature(struct nmbm_instance *ni, uint32_t limit, + const struct nmbm_signature *signature, + uint32_t *signature_ba) +{ + uint32_t ba = ni->block_count - 1; + bool success; + + while (ba > limit) { + if (nmbm_get_block_state(ni, ba) != BLOCK_ST_GOOD) + goto next_block; + + /* Insurance to detect unexpected bad block marked by user */ + if (nmbm_check_bad_phys_block(ni, ba)) { + nmbm_set_block_state(ni, ba, BLOCK_ST_BAD); + goto next_block; + } + + success = nmbm_erase_block_and_check(ni, ba); + if (!success) + goto skip_bad_block; + + success = nmbm_write_repeated_data(ni, ba, signature, + sizeof(*signature)); + if (success) { + *signature_ba = ba; + return true; + } + + skip_bad_block: + nmbm_mark_phys_bad_block(ni, ba); + nmbm_set_block_state(ni, ba, BLOCK_ST_BAD); + + next_block: + ba--; + }; + + return false; +} + +/* + * nmbn_read_data - Read data + * @ni: NMBM instance structure + * @addr: linear address where the data will be read from + * @data: the data to be read + * @size: the size of data + * + * Read data range. + * Every page will be tried for at most NMBM_TRY_COUNT times. + * + * Return 0 for success, positive value for corrected bitflip count, + * -EBADMSG for ecc error, other negative values for other errors + */ +static int nmbn_read_data(struct nmbm_instance *ni, uint64_t addr, void *data, + uint32_t size) +{ + uint64_t off = addr; + uint8_t *ptr = data; + uint32_t sizeremain = size, chunksize, leading; + int ret; + + while (sizeremain) { + leading = off & (bmtd.pg_size - 1); + chunksize = bmtd.pg_size - leading; + if (chunksize > sizeremain) + chunksize = sizeremain; + + if (chunksize == bmtd.pg_size) { + ret = nmbm_read_phys_page(ni, off - leading, ptr, NULL); + if (ret < 0) + return ret; + } else { + ret = nmbm_read_phys_page(ni, off - leading, + ni->page_cache, NULL); + if (ret < 0) + return ret; + + memcpy(ptr, ni->page_cache + leading, chunksize); + } + + off += chunksize; + ptr += chunksize; + sizeremain -= chunksize; + } + + return 0; +} + +/* + * nmbn_write_verify_data - Write data with validation + * @ni: NMBM instance structure + * @addr: linear address where the data will be written to + * @data: the data to be written + * @size: the size of data + * + * Write data and verify. + * Every page will be tried for at most NMBM_TRY_COUNT times. + */ +static bool nmbn_write_verify_data(struct nmbm_instance *ni, uint64_t addr, + const void *data, uint32_t size) +{ + uint64_t off = addr; + const uint8_t *ptr = data; + uint32_t sizeremain = size, chunksize, leading; + bool success; + int ret; + + while (sizeremain) { + leading = off & (bmtd.pg_size - 1); + chunksize = bmtd.pg_size - leading; + if (chunksize > sizeremain) + chunksize = sizeremain; + + /* Prepare page data. fill 0xff to unused region */ + memset(ni->page_cache, 0xff, ni->rawpage_size); + memcpy(ni->page_cache + leading, ptr, chunksize); + + success = nmbm_write_phys_page(ni, off - leading, + ni->page_cache, NULL); + if (!success) + return false; + + /* Verify the data just written. ECC error indicates failure */ + ret = nmbm_read_phys_page(ni, off - leading, ni->page_cache, NULL); + if (ret < 0) + return false; + + if (memcmp(ni->page_cache + leading, ptr, chunksize)) + return false; + + off += chunksize; + ptr += chunksize; + sizeremain -= chunksize; + } + + return true; +} + +/* + * nmbm_write_mgmt_range - Write management data into NAND within a range + * @ni: NMBM instance structure + * @addr: preferred start block address for writing + * @limit: highest block address allowed for writing + * @data: the data to be written + * @size: the size of data + * @actual_start_ba: actual start block address of data + * @actual_end_ba: block address after the end of data + * + * @limit is not counted into the allowed write address. + */ +static bool nmbm_write_mgmt_range(struct nmbm_instance *ni, uint32_t ba, + uint32_t limit, const void *data, + uint32_t size, uint32_t *actual_start_ba, + uint32_t *actual_end_ba) +{ + const uint8_t *ptr = data; + uint32_t sizeremain = size, chunksize; + bool success; + + while (sizeremain && ba < limit) { + chunksize = sizeremain; + if (chunksize > bmtd.blk_size) + chunksize = bmtd.blk_size; + + if (nmbm_get_block_state(ni, ba) != BLOCK_ST_GOOD) + goto next_block; + + /* Insurance to detect unexpected bad block marked by user */ + if (nmbm_check_bad_phys_block(ni, ba)) { + nmbm_set_block_state(ni, ba, BLOCK_ST_BAD); + goto next_block; + } + + success = nmbm_erase_block_and_check(ni, ba); + if (!success) + goto skip_bad_block; + + success = nmbn_write_verify_data(ni, ba2addr(ni, ba), ptr, + chunksize); + if (!success) + goto skip_bad_block; + + if (sizeremain == size) + *actual_start_ba = ba; + + ptr += chunksize; + sizeremain -= chunksize; + + goto next_block; + + skip_bad_block: + nmbm_mark_phys_bad_block(ni, ba); + nmbm_set_block_state(ni, ba, BLOCK_ST_BAD); + + next_block: + ba++; + } + + if (sizeremain) + return false; + + *actual_end_ba = ba; + + return true; +} + +/* + * nmbm_generate_info_table_cache - Generate info table cache data + * @ni: NMBM instance structure + * + * Generate info table cache data to be written into flash. + */ +static bool nmbm_generate_info_table_cache(struct nmbm_instance *ni) +{ + bool changed = false; + + memset(ni->info_table_cache, 0xff, ni->info_table_size); + + memcpy(ni->info_table_cache + ni->info_table.state_table_off, + ni->block_state, ni->state_table_size); + + memcpy(ni->info_table_cache + ni->info_table.mapping_table_off, + ni->block_mapping, ni->mapping_table_size); + + ni->info_table.header.magic = NMBM_MAGIC_INFO_TABLE; + ni->info_table.header.version = NMBM_VER; + ni->info_table.header.size = ni->info_table_size; + + if (ni->block_state_changed || ni->block_mapping_changed) { + ni->info_table.write_count++; + changed = true; + } + + memcpy(ni->info_table_cache, &ni->info_table, sizeof(ni->info_table)); + + nmbm_update_checksum((struct nmbm_header *)ni->info_table_cache); + + return changed; +} + +/* + * nmbm_write_info_table - Write info table into NAND within a range + * @ni: NMBM instance structure + * @ba: preferred start block address for writing + * @limit: highest block address allowed for writing + * @actual_start_ba: actual start block address of info table + * @actual_end_ba: block address after the end of info table + * + * @limit is counted into the allowed write address. + */ +static bool nmbm_write_info_table(struct nmbm_instance *ni, uint32_t ba, + uint32_t limit, uint32_t *actual_start_ba, + uint32_t *actual_end_ba) +{ + return nmbm_write_mgmt_range(ni, ba, limit, ni->info_table_cache, + ni->info_table_size, actual_start_ba, + actual_end_ba); +} + +/* + * nmbm_mark_tables_clean - Mark info table `clean' + * @ni: NMBM instance structure + */ +static void nmbm_mark_tables_clean(struct nmbm_instance *ni) +{ + ni->block_state_changed = 0; + ni->block_mapping_changed = 0; +} + +/* + * nmbm_try_reserve_blocks - Reserve blocks with compromisation + * @ni: NMBM instance structure + * @ba: start physical block address + * @nba: return physical block address after reservation + * @count: number of good blocks to be skipped + * @min_count: minimum number of good blocks to be skipped + * @limit: highest/lowest block address allowed for walking + * + * Reserve specific blocks. If failed, try to reserve as many as possible. + */ +static bool nmbm_try_reserve_blocks(struct nmbm_instance *ni, uint32_t ba, + uint32_t *nba, uint32_t count, + int32_t min_count, int32_t limit) +{ + int32_t nblocks = count; + bool success; + + while (nblocks >= min_count) { + success = nmbm_block_walk(ni, true, ba, nba, nblocks, limit); + if (success) + return true; + + nblocks--; + } + + return false; +} + +/* + * nmbm_rebuild_info_table - Build main & backup info table from scratch + * @ni: NMBM instance structure + * @allow_no_gap: allow no spare blocks between two tables + */ +static bool nmbm_rebuild_info_table(struct nmbm_instance *ni) +{ + uint32_t table_start_ba, table_end_ba, next_start_ba; + uint32_t main_table_end_ba; + bool success; + + /* Set initial value */ + ni->main_table_ba = 0; + ni->backup_table_ba = 0; + ni->mapping_blocks_ba = ni->mapping_blocks_top_ba; + + /* Write main table */ + success = nmbm_write_info_table(ni, ni->mgmt_start_ba, + ni->mapping_blocks_top_ba, + &table_start_ba, &table_end_ba); + if (!success) { + /* Failed to write main table, data will be lost */ + nlog_err(ni, "Unable to write at least one info table!\n"); + nlog_err(ni, "Please save your data before power off!\n"); + ni->protected = 1; + return false; + } + + /* Main info table is successfully written, record its offset */ + ni->main_table_ba = table_start_ba; + main_table_end_ba = table_end_ba; + + /* Adjust mapping_blocks_ba */ + ni->mapping_blocks_ba = table_end_ba; + + nmbm_mark_tables_clean(ni); + + nlog_table_creation(ni, true, table_start_ba, table_end_ba); + + /* Reserve spare blocks for main info table. */ + success = nmbm_try_reserve_blocks(ni, table_end_ba, + &next_start_ba, + ni->info_table_spare_blocks, 0, + ni->mapping_blocks_top_ba - + size2blk(ni, ni->info_table_size)); + if (!success) { + /* There is no spare block. */ + nlog_debug(ni, "No room for backup info table\n"); + return true; + } + + /* Write backup info table. */ + success = nmbm_write_info_table(ni, next_start_ba, + ni->mapping_blocks_top_ba, + &table_start_ba, &table_end_ba); + if (!success) { + /* There is no enough blocks for backup table. */ + nlog_debug(ni, "No room for backup info table\n"); + return true; + } + + /* Backup table is successfully written, record its offset */ + ni->backup_table_ba = table_start_ba; + + /* Adjust mapping_blocks_off */ + ni->mapping_blocks_ba = table_end_ba; + + /* Erase spare blocks of main table to clean possible interference data */ + nmbm_erase_range(ni, main_table_end_ba, ni->backup_table_ba); + + nlog_table_creation(ni, false, table_start_ba, table_end_ba); + + return true; +} + +/* + * nmbm_rescue_single_info_table - Rescue when there is only one info table + * @ni: NMBM instance structure + * + * This function is called when there is only one info table exists. + * This function may fail if we can't write new info table + */ +static bool nmbm_rescue_single_info_table(struct nmbm_instance *ni) +{ + uint32_t table_start_ba, table_end_ba, write_ba; + bool success; + + /* Try to write new info table in front of existing table */ + success = nmbm_write_info_table(ni, ni->mgmt_start_ba, + ni->main_table_ba, + &table_start_ba, + &table_end_ba); + if (success) { + /* + * New table becomes the main table, existing table becomes + * the backup table. + */ + ni->backup_table_ba = ni->main_table_ba; + ni->main_table_ba = table_start_ba; + + nmbm_mark_tables_clean(ni); + + /* Erase spare blocks of main table to clean possible interference data */ + nmbm_erase_range(ni, table_end_ba, ni->backup_table_ba); + + nlog_table_creation(ni, true, table_start_ba, table_end_ba); + + return true; + } + + /* Try to reserve spare blocks for existing table */ + success = nmbm_try_reserve_blocks(ni, ni->mapping_blocks_ba, &write_ba, + ni->info_table_spare_blocks, 0, + ni->mapping_blocks_top_ba - + size2blk(ni, ni->info_table_size)); + if (!success) { + nlog_warn(ni, "Failed to rescue single info table\n"); + return false; + } + + /* Try to write new info table next to the existing table */ + while (write_ba >= ni->mapping_blocks_ba) { + success = nmbm_write_info_table(ni, write_ba, + ni->mapping_blocks_top_ba, + &table_start_ba, + &table_end_ba); + if (success) + break; + + write_ba--; + } + + if (success) { + /* Erase spare blocks of main table to clean possible interference data */ + nmbm_erase_range(ni, ni->mapping_blocks_ba, table_start_ba); + + /* New table becomes the backup table */ + ni->backup_table_ba = table_start_ba; + ni->mapping_blocks_ba = table_end_ba; + + nmbm_mark_tables_clean(ni); + + nlog_table_creation(ni, false, table_start_ba, table_end_ba); + + return true; + } + + nlog_warn(ni, "Failed to rescue single info table\n"); + return false; +} + +/* + * nmbm_update_single_info_table - Update specific one info table + * @ni: NMBM instance structure + */ +static bool nmbm_update_single_info_table(struct nmbm_instance *ni, + bool update_main_table) +{ + uint32_t write_start_ba, write_limit, table_start_ba, table_end_ba; + bool success; + + /* Determine the write range */ + if (update_main_table) { + write_start_ba = ni->main_table_ba; + write_limit = ni->backup_table_ba; + } else { + write_start_ba = ni->backup_table_ba; + write_limit = ni->mapping_blocks_top_ba; + } + + success = nmbm_write_info_table(ni, write_start_ba, write_limit, + &table_start_ba, &table_end_ba); + if (success) { + if (update_main_table) { + ni->main_table_ba = table_start_ba; + } else { + ni->backup_table_ba = table_start_ba; + ni->mapping_blocks_ba = table_end_ba; + } + + nmbm_mark_tables_clean(ni); + + nlog_table_update(ni, update_main_table, table_start_ba, + table_end_ba); + + return true; + } + + if (update_main_table) { + /* + * If failed to update main table, make backup table the new + * main table, and call nmbm_rescue_single_info_table() + */ + nlog_warn(ni, "Unable to update %s info table\n", + update_main_table ? "Main" : "Backup"); + + ni->main_table_ba = ni->backup_table_ba; + ni->backup_table_ba = 0; + return nmbm_rescue_single_info_table(ni); + } + + /* Only one table left */ + ni->mapping_blocks_ba = ni->backup_table_ba; + ni->backup_table_ba = 0; + + return false; +} + +/* + * nmbm_rescue_main_info_table - Rescue when failed to write main info table + * @ni: NMBM instance structure + * + * This function is called when main info table failed to be written, and + * backup info table exists. + */ +static bool nmbm_rescue_main_info_table(struct nmbm_instance *ni) +{ + uint32_t tmp_table_start_ba, tmp_table_end_ba, main_table_start_ba; + uint32_t main_table_end_ba, write_ba; + uint32_t info_table_erasesize = size2blk(ni, ni->info_table_size); + bool success; + + /* Try to reserve spare blocks for existing backup info table */ + success = nmbm_try_reserve_blocks(ni, ni->mapping_blocks_ba, &write_ba, + ni->info_table_spare_blocks, 0, + ni->mapping_blocks_top_ba - + info_table_erasesize); + if (!success) { + /* There is no spare block. Backup info table becomes the main table. */ + nlog_err(ni, "No room for temporary info table\n"); + ni->main_table_ba = ni->backup_table_ba; + ni->backup_table_ba = 0; + return true; + } + + /* Try to write temporary info table into spare unmapped blocks */ + while (write_ba >= ni->mapping_blocks_ba) { + success = nmbm_write_info_table(ni, write_ba, + ni->mapping_blocks_top_ba, + &tmp_table_start_ba, + &tmp_table_end_ba); + if (success) + break; + + write_ba--; + } + + if (!success) { + /* Backup info table becomes the main table */ + nlog_err(ni, "Failed to update main info table\n"); + ni->main_table_ba = ni->backup_table_ba; + ni->backup_table_ba = 0; + return true; + } + + /* Adjust mapping_blocks_off */ + ni->mapping_blocks_ba = tmp_table_end_ba; + + /* + * Now write main info table at the beginning of management area. + * This operation will generally destroy the original backup info + * table. + */ + success = nmbm_write_info_table(ni, ni->mgmt_start_ba, + tmp_table_start_ba, + &main_table_start_ba, + &main_table_end_ba); + if (!success) { + /* Temporary info table becomes the main table */ + ni->main_table_ba = tmp_table_start_ba; + ni->backup_table_ba = 0; + + nmbm_mark_tables_clean(ni); + + nlog_err(ni, "Failed to update main info table\n"); + + return true; + } + + /* Main info table has been successfully written, record its offset */ + ni->main_table_ba = main_table_start_ba; + + nmbm_mark_tables_clean(ni); + + nlog_table_creation(ni, true, main_table_start_ba, main_table_end_ba); + + /* + * Temporary info table becomes the new backup info table if it's + * not overwritten. + */ + if (main_table_end_ba <= tmp_table_start_ba) { + ni->backup_table_ba = tmp_table_start_ba; + + nlog_table_creation(ni, false, tmp_table_start_ba, + tmp_table_end_ba); + + return true; + } + + /* Adjust mapping_blocks_off */ + ni->mapping_blocks_ba = main_table_end_ba; + + /* Try to reserve spare blocks for new main info table */ + success = nmbm_try_reserve_blocks(ni, main_table_end_ba, &write_ba, + ni->info_table_spare_blocks, 0, + ni->mapping_blocks_top_ba - + info_table_erasesize); + if (!success) { + /* There is no spare block. Only main table exists. */ + nlog_err(ni, "No room for backup info table\n"); + ni->backup_table_ba = 0; + return true; + } + + /* Write new backup info table. */ + while (write_ba >= main_table_end_ba) { + success = nmbm_write_info_table(ni, write_ba, + ni->mapping_blocks_top_ba, + &tmp_table_start_ba, + &tmp_table_end_ba); + if (success) + break; + + write_ba--; + } + + if (!success) { + nlog_err(ni, "No room for backup info table\n"); + ni->backup_table_ba = 0; + return true; + } + + /* Backup info table has been successfully written, record its offset */ + ni->backup_table_ba = tmp_table_start_ba; + + /* Adjust mapping_blocks_off */ + ni->mapping_blocks_ba = tmp_table_end_ba; + + /* Erase spare blocks of main table to clean possible interference data */ + nmbm_erase_range(ni, main_table_end_ba, ni->backup_table_ba); + + nlog_table_creation(ni, false, tmp_table_start_ba, tmp_table_end_ba); + + return true; +} + +/* + * nmbm_update_info_table_once - Update info table once + * @ni: NMBM instance structure + * @force: force update + * + * Update both main and backup info table. Return true if at least one info + * table has been successfully written. + * This function only try to update info table once regard less of the result. + */ +static bool nmbm_update_info_table_once(struct nmbm_instance *ni, bool force) +{ + uint32_t table_start_ba, table_end_ba; + uint32_t main_table_limit; + bool success; + + /* Do nothing if there is no change */ + if (!nmbm_generate_info_table_cache(ni) && !force) + return true; + + /* Check whether both two tables exist */ + if (!ni->backup_table_ba) { + main_table_limit = ni->mapping_blocks_top_ba; + goto write_main_table; + } + + /* + * Write backup info table in its current range. + * Note that limit is set to mapping_blocks_top_off to provide as many + * spare blocks as possible for the backup table. If at last + * unmapped blocks are used by backup table, mapping_blocks_off will + * be adjusted. + */ + success = nmbm_write_info_table(ni, ni->backup_table_ba, + ni->mapping_blocks_top_ba, + &table_start_ba, &table_end_ba); + if (!success) { + /* + * There is nothing to do if failed to write backup table. + * Write the main table now. + */ + nlog_err(ni, "No room for backup table\n"); + ni->mapping_blocks_ba = ni->backup_table_ba; + ni->backup_table_ba = 0; + main_table_limit = ni->mapping_blocks_top_ba; + goto write_main_table; + } + + /* Backup table is successfully written, record its offset */ + ni->backup_table_ba = table_start_ba; + + /* Adjust mapping_blocks_off */ + ni->mapping_blocks_ba = table_end_ba; + + nmbm_mark_tables_clean(ni); + + /* The normal limit of main table */ + main_table_limit = ni->backup_table_ba; + + nlog_table_update(ni, false, table_start_ba, table_end_ba); + +write_main_table: + if (!ni->main_table_ba) + goto rebuild_tables; + + /* Write main info table in its current range */ + success = nmbm_write_info_table(ni, ni->main_table_ba, + main_table_limit, &table_start_ba, + &table_end_ba); + if (!success) { + /* If failed to write main table, go rescue procedure */ + if (!ni->backup_table_ba) + goto rebuild_tables; + + return nmbm_rescue_main_info_table(ni); + } + + /* Main info table is successfully written, record its offset */ + ni->main_table_ba = table_start_ba; + + /* Adjust mapping_blocks_off */ + if (!ni->backup_table_ba) + ni->mapping_blocks_ba = table_end_ba; + + nmbm_mark_tables_clean(ni); + + nlog_table_update(ni, true, table_start_ba, table_end_ba); + + return true; + +rebuild_tables: + return nmbm_rebuild_info_table(ni); +} + +/* + * nmbm_update_info_table - Update info table + * @ni: NMBM instance structure + * + * Update both main and backup info table. Return true if at least one table + * has been successfully written. + * This function will try to update info table repeatedly until no new bad + * block found during updating. + */ +static bool nmbm_update_info_table(struct nmbm_instance *ni) +{ + bool success; + + if (ni->protected) + return true; + + while (ni->block_state_changed || ni->block_mapping_changed) { + success = nmbm_update_info_table_once(ni, false); + if (!success) { + nlog_err(ni, "Failed to update info table\n"); + return false; + } + } + + return true; +} + +/* + * nmbm_map_block - Map a bad block to a unused spare block + * @ni: NMBM instance structure + * @lb: logic block addr to map + */ +static bool nmbm_map_block(struct nmbm_instance *ni, uint32_t lb) +{ + uint32_t pb; + bool success; + + if (ni->mapping_blocks_ba == ni->mapping_blocks_top_ba) { + nlog_warn(ni, "No spare unmapped blocks.\n"); + return false; + } + + success = nmbm_block_walk(ni, false, ni->mapping_blocks_top_ba, &pb, 0, + ni->mapping_blocks_ba); + if (!success) { + nlog_warn(ni, "No spare unmapped blocks.\n"); + nmbm_update_info_table(ni); + ni->mapping_blocks_top_ba = ni->mapping_blocks_ba; + return false; + } + + ni->block_mapping[lb] = pb; + ni->mapping_blocks_top_ba--; + ni->block_mapping_changed++; + + nlog_info(ni, "Logic block %u mapped to physical block %u\n", lb, pb); + + return true; +} + +/* + * nmbm_create_info_table - Create info table(s) + * @ni: NMBM instance structure + * + * This function assumes that the chip has no existing info table(s) + */ +static bool nmbm_create_info_table(struct nmbm_instance *ni) +{ + uint32_t lb; + bool success; + + /* Set initial mapping_blocks_top_off */ + success = nmbm_block_walk(ni, false, ni->signature_ba, + &ni->mapping_blocks_top_ba, 1, + ni->mgmt_start_ba); + if (!success) { + nlog_err(ni, "No room for spare blocks\n"); + return false; + } + + /* Generate info table cache */ + nmbm_generate_info_table_cache(ni); + + /* Write info table */ + success = nmbm_rebuild_info_table(ni); + if (!success) { + nlog_err(ni, "Failed to build info tables\n"); + return false; + } + + /* Remap bad block(s) at end of data area */ + for (lb = ni->data_block_count; lb < ni->mgmt_start_ba; lb++) { + success = nmbm_map_block(ni, lb); + if (!success) + break; + + ni->data_block_count++; + } + + /* If state table and/or mapping table changed, update info table. */ + success = nmbm_update_info_table(ni); + if (!success) + return false; + + return true; +} + +/* + * nmbm_create_new - Create NMBM on a new chip + * @ni: NMBM instance structure + */ +static bool nmbm_create_new(struct nmbm_instance *ni) +{ + bool success; + + /* Determine the boundary of management blocks */ + ni->mgmt_start_ba = ni->block_count * (NMBM_MGMT_DIV - ni->max_ratio) / NMBM_MGMT_DIV; + + if (ni->max_reserved_blocks && ni->block_count - ni->mgmt_start_ba > ni->max_reserved_blocks) + ni->mgmt_start_ba = ni->block_count - ni->max_reserved_blocks; + + nlog_info(ni, "NMBM management region starts at block %u [0x%08llx]\n", + ni->mgmt_start_ba, ba2addr(ni, ni->mgmt_start_ba)); + + /* Fill block state table & mapping table */ + nmbm_scan_badblocks(ni); + nmbm_build_mapping_table(ni); + + /* Write signature */ + ni->signature.header.magic = NMBM_MAGIC_SIGNATURE; + ni->signature.header.version = NMBM_VER; + ni->signature.header.size = sizeof(ni->signature); + ni->signature.nand_size = bmtd.total_blks << bmtd.blk_shift; + ni->signature.block_size = bmtd.blk_size; + ni->signature.page_size = bmtd.pg_size; + ni->signature.spare_size = bmtd.mtd->oobsize; + ni->signature.mgmt_start_pb = ni->mgmt_start_ba; + ni->signature.max_try_count = NMBM_TRY_COUNT; + nmbm_update_checksum(&ni->signature.header); + + success = nmbm_write_signature(ni, ni->mgmt_start_ba, + &ni->signature, &ni->signature_ba); + if (!success) { + nlog_err(ni, "Failed to write signature to a proper offset\n"); + return false; + } + + nlog_info(ni, "Signature has been written to block %u [0x%08llx]\n", + ni->signature_ba, ba2addr(ni, ni->signature_ba)); + + /* Write info table(s) */ + success = nmbm_create_info_table(ni); + if (success) { + nlog_info(ni, "NMBM has been successfully created\n"); + return true; + } + + return false; +} + +/* + * nmbm_check_info_table_header - Check if a info table header is valid + * @ni: NMBM instance structure + * @data: pointer to the info table header + */ +static bool nmbm_check_info_table_header(struct nmbm_instance *ni, void *data) +{ + struct nmbm_info_table_header *ifthdr = data; + + if (ifthdr->header.magic != NMBM_MAGIC_INFO_TABLE) + return false; + + if (ifthdr->header.size != ni->info_table_size) + return false; + + if (ifthdr->mapping_table_off - ifthdr->state_table_off < ni->state_table_size) + return false; + + if (ni->info_table_size - ifthdr->mapping_table_off < ni->mapping_table_size) + return false; + + return true; +} + +/* + * nmbm_check_info_table - Check if a whole info table is valid + * @ni: NMBM instance structure + * @start_ba: start block address of this table + * @end_ba: end block address of this table + * @data: pointer to the info table header + * @mapping_blocks_top_ba: return the block address of top remapped block + */ +static bool nmbm_check_info_table(struct nmbm_instance *ni, uint32_t start_ba, + uint32_t end_ba, void *data, + uint32_t *mapping_blocks_top_ba) +{ + struct nmbm_info_table_header *ifthdr = data; + int32_t *block_mapping = (int32_t *)((uintptr_t)data + ifthdr->mapping_table_off); + u32 *block_state = (u32 *)((uintptr_t)data + ifthdr->state_table_off); + uint32_t minimum_mapping_pb = ni->signature_ba; + uint32_t ba; + + for (ba = 0; ba < ni->data_block_count; ba++) { + if ((block_mapping[ba] >= ni->data_block_count && block_mapping[ba] < end_ba) || + block_mapping[ba] == ni->signature_ba) + return false; + + if (block_mapping[ba] >= end_ba && block_mapping[ba] < minimum_mapping_pb) + minimum_mapping_pb = block_mapping[ba]; + } + + for (ba = start_ba; ba < end_ba; ba++) { + if (nmbm_get_block_state(ni, ba) != BLOCK_ST_GOOD) + continue; + + if (nmbm_get_block_state_raw(block_state, ba) != BLOCK_ST_GOOD) + return false; + } + + *mapping_blocks_top_ba = minimum_mapping_pb - 1; + + return true; +} + +/* + * nmbm_try_load_info_table - Try to load info table from a address + * @ni: NMBM instance structure + * @ba: start block address of the info table + * @eba: return the block address after end of the table + * @write_count: return the write count of this table + * @mapping_blocks_top_ba: return the block address of top remapped block + * @table_loaded: used to record whether ni->info_table has valid data + */ +static bool nmbm_try_load_info_table(struct nmbm_instance *ni, uint32_t ba, + uint32_t *eba, uint32_t *write_count, + uint32_t *mapping_blocks_top_ba, + bool table_loaded) +{ + struct nmbm_info_table_header *ifthdr = (void *)ni->info_table_cache; + uint8_t *off = ni->info_table_cache; + uint32_t limit = ba + size2blk(ni, ni->info_table_size); + uint32_t start_ba = 0, chunksize, sizeremain = ni->info_table_size; + bool success, checkhdr = true; + int ret; + + while (sizeremain && ba < limit) { + if (nmbm_get_block_state(ni, ba) != BLOCK_ST_GOOD) + goto next_block; + + if (nmbm_check_bad_phys_block(ni, ba)) { + nmbm_set_block_state(ni, ba, BLOCK_ST_BAD); + goto next_block; + } + + chunksize = sizeremain; + if (chunksize > bmtd.blk_size) + chunksize = bmtd.blk_size; + + /* Assume block with ECC error has no info table data */ + ret = nmbn_read_data(ni, ba2addr(ni, ba), off, chunksize); + if (ret < 0) + goto skip_bad_block; + else if (ret > 0) + return false; + + if (checkhdr) { + success = nmbm_check_info_table_header(ni, off); + if (!success) + return false; + + start_ba = ba; + checkhdr = false; + } + + off += chunksize; + sizeremain -= chunksize; + + goto next_block; + + skip_bad_block: + /* Only mark bad in memory */ + nmbm_set_block_state(ni, ba, BLOCK_ST_BAD); + + next_block: + ba++; + } + + if (sizeremain) + return false; + + success = nmbm_check_header(ni->info_table_cache, ni->info_table_size); + if (!success) + return false; + + *eba = ba; + *write_count = ifthdr->write_count; + + success = nmbm_check_info_table(ni, start_ba, ba, ni->info_table_cache, + mapping_blocks_top_ba); + if (!success) + return false; + + if (!table_loaded || ifthdr->write_count > ni->info_table.write_count) { + memcpy(&ni->info_table, ifthdr, sizeof(ni->info_table)); + memcpy(ni->block_state, + (uint8_t *)ifthdr + ifthdr->state_table_off, + ni->state_table_size); + memcpy(ni->block_mapping, + (uint8_t *)ifthdr + ifthdr->mapping_table_off, + ni->mapping_table_size); + ni->info_table.write_count = ifthdr->write_count; + } + + return true; +} + +/* + * nmbm_search_info_table - Search info table from specific address + * @ni: NMBM instance structure + * @ba: start block address to search + * @limit: highest block address allowed for searching + * @table_start_ba: return the start block address of this table + * @table_end_ba: return the block address after end of this table + * @write_count: return the write count of this table + * @mapping_blocks_top_ba: return the block address of top remapped block + * @table_loaded: used to record whether ni->info_table has valid data + */ +static bool nmbm_search_info_table(struct nmbm_instance *ni, uint32_t ba, + uint32_t limit, uint32_t *table_start_ba, + uint32_t *table_end_ba, + uint32_t *write_count, + uint32_t *mapping_blocks_top_ba, + bool table_loaded) +{ + bool success; + + while (ba < limit - size2blk(ni, ni->info_table_size)) { + success = nmbm_try_load_info_table(ni, ba, table_end_ba, + write_count, + mapping_blocks_top_ba, + table_loaded); + if (success) { + *table_start_ba = ba; + return true; + } + + ba++; + } + + return false; +} + +/* + * nmbm_load_info_table - Load info table(s) from a chip + * @ni: NMBM instance structure + * @ba: start block address to search info table + * @limit: highest block address allowed for searching + */ +static bool nmbm_load_info_table(struct nmbm_instance *ni, uint32_t ba, + uint32_t limit) +{ + uint32_t main_table_end_ba, backup_table_end_ba, table_end_ba; + uint32_t main_mapping_blocks_top_ba, backup_mapping_blocks_top_ba; + uint32_t main_table_write_count, backup_table_write_count; + uint32_t i; + bool success; + + /* Set initial value */ + ni->main_table_ba = 0; + ni->backup_table_ba = 0; + ni->info_table.write_count = 0; + ni->mapping_blocks_top_ba = ni->signature_ba - 1; + ni->data_block_count = ni->signature.mgmt_start_pb; + + /* Find first info table */ + success = nmbm_search_info_table(ni, ba, limit, &ni->main_table_ba, + &main_table_end_ba, &main_table_write_count, + &main_mapping_blocks_top_ba, false); + if (!success) { + nlog_warn(ni, "No valid info table found\n"); + return false; + } + + table_end_ba = main_table_end_ba; + + nlog_table_found(ni, true, main_table_write_count, ni->main_table_ba, + main_table_end_ba); + + /* Find second info table */ + success = nmbm_search_info_table(ni, main_table_end_ba, limit, + &ni->backup_table_ba, &backup_table_end_ba, + &backup_table_write_count, &backup_mapping_blocks_top_ba, true); + if (!success) { + nlog_warn(ni, "Second info table not found\n"); + } else { + table_end_ba = backup_table_end_ba; + + nlog_table_found(ni, false, backup_table_write_count, + ni->backup_table_ba, backup_table_end_ba); + } + + /* Pick mapping_blocks_top_ba */ + if (!ni->backup_table_ba) { + ni->mapping_blocks_top_ba= main_mapping_blocks_top_ba; + } else { + if (main_table_write_count >= backup_table_write_count) + ni->mapping_blocks_top_ba = main_mapping_blocks_top_ba; + else + ni->mapping_blocks_top_ba = backup_mapping_blocks_top_ba; + } + + /* Set final mapping_blocks_ba */ + ni->mapping_blocks_ba = table_end_ba; + + /* Set final data_block_count */ + for (i = ni->signature.mgmt_start_pb; i > 0; i--) { + if (ni->block_mapping[i - 1] >= 0) { + ni->data_block_count = i; + break; + } + } + + /* Regenerate the info table cache from the final selected info table */ + nmbm_generate_info_table_cache(ni); + + /* + * If only one table exists, try to write another table. + * If two tables have different write count, try to update info table + */ + if (!ni->backup_table_ba) { + success = nmbm_rescue_single_info_table(ni); + } else if (main_table_write_count != backup_table_write_count) { + /* Mark state & mapping tables changed */ + ni->block_state_changed = 1; + ni->block_mapping_changed = 1; + + success = nmbm_update_single_info_table(ni, + main_table_write_count < backup_table_write_count); + } else { + success = true; + } + + /* + * If there is no spare unmapped blocks, or still only one table + * exists, set the chip to read-only + */ + if (ni->mapping_blocks_ba == ni->mapping_blocks_top_ba) { + nlog_warn(ni, "No spare unmapped blocks. Device is now read-only\n"); + ni->protected = 1; + } else if (!success) { + nlog_warn(ni, "Only one info table found. Device is now read-only\n"); + ni->protected = 1; + } + + return true; +} + +/* + * nmbm_load_existing - Load NMBM from a new chip + * @ni: NMBM instance structure + */ +static bool nmbm_load_existing(struct nmbm_instance *ni) +{ + bool success; + + /* Calculate the boundary of management blocks */ + ni->mgmt_start_ba = ni->signature.mgmt_start_pb; + + nlog_debug(ni, "NMBM management region starts at block %u [0x%08llx]\n", + ni->mgmt_start_ba, ba2addr(ni, ni->mgmt_start_ba)); + + /* Look for info table(s) */ + success = nmbm_load_info_table(ni, ni->mgmt_start_ba, + ni->signature_ba); + if (success) { + nlog_info(ni, "NMBM has been successfully attached\n"); + return true; + } + + if (!ni->force_create) { + printk("not creating NMBM table\n"); + return false; + } + + /* Fill block state table & mapping table */ + nmbm_scan_badblocks(ni); + nmbm_build_mapping_table(ni); + + /* Write info table(s) */ + success = nmbm_create_info_table(ni); + if (success) { + nlog_info(ni, "NMBM has been successfully created\n"); + return true; + } + + return false; +} + +/* + * nmbm_find_signature - Find signature in the lower NAND chip + * @ni: NMBM instance structure + * @signature_ba: used for storing block address of the signature + * @signature_ba: return the actual block address of signature block + * + * Find a valid signature from a specific range in the lower NAND chip, + * from bottom (highest address) to top (lowest address) + * + * Return true if found. + */ +static bool nmbm_find_signature(struct nmbm_instance *ni, + struct nmbm_signature *signature, + uint32_t *signature_ba) +{ + struct nmbm_signature sig; + uint64_t off, addr; + uint32_t block_count, ba, limit; + bool success; + int ret; + + /* Calculate top and bottom block address */ + block_count = bmtd.total_blks; + ba = block_count; + limit = (block_count / NMBM_MGMT_DIV) * (NMBM_MGMT_DIV - ni->max_ratio); + if (ni->max_reserved_blocks && block_count - limit > ni->max_reserved_blocks) + limit = block_count - ni->max_reserved_blocks; + + while (ba >= limit) { + ba--; + addr = ba2addr(ni, ba); + + if (nmbm_check_bad_phys_block(ni, ba)) + continue; + + /* Check every page. + * As long as at leaset one page contains valid signature, + * the block is treated as a valid signature block. + */ + for (off = 0; off < bmtd.blk_size; + off += bmtd.pg_size) { + ret = nmbn_read_data(ni, addr + off, &sig, + sizeof(sig)); + if (ret) + continue; + + /* Check for header size and checksum */ + success = nmbm_check_header(&sig, sizeof(sig)); + if (!success) + continue; + + /* Check for header magic */ + if (sig.header.magic == NMBM_MAGIC_SIGNATURE) { + /* Found it */ + memcpy(signature, &sig, sizeof(sig)); + *signature_ba = ba; + return true; + } + } + }; + + return false; +} + +/* + * nmbm_calc_structure_size - Calculate the instance structure size + * @nld: NMBM lower device structure + */ +static size_t nmbm_calc_structure_size(void) +{ + uint32_t state_table_size, mapping_table_size, info_table_size; + uint32_t block_count; + + block_count = bmtd.total_blks; + + /* Calculate info table size */ + state_table_size = ((block_count + NMBM_BITMAP_BLOCKS_PER_UNIT - 1) / + NMBM_BITMAP_BLOCKS_PER_UNIT) * NMBM_BITMAP_UNIT_SIZE; + mapping_table_size = block_count * sizeof(int32_t); + + info_table_size = ALIGN(sizeof(struct nmbm_info_table_header), + bmtd.pg_size); + info_table_size += ALIGN(state_table_size, bmtd.pg_size); + info_table_size += ALIGN(mapping_table_size, bmtd.pg_size); + + return info_table_size + state_table_size + mapping_table_size + + sizeof(struct nmbm_instance); +} + +/* + * nmbm_init_structure - Initialize members of instance structure + * @ni: NMBM instance structure + */ +static void nmbm_init_structure(struct nmbm_instance *ni) +{ + uint32_t pages_per_block, blocks_per_chip; + uintptr_t ptr; + + pages_per_block = bmtd.blk_size / bmtd.pg_size; + blocks_per_chip = bmtd.total_blks; + + ni->rawpage_size = bmtd.pg_size + bmtd.mtd->oobsize; + ni->rawblock_size = pages_per_block * ni->rawpage_size; + ni->rawchip_size = blocks_per_chip * ni->rawblock_size; + + /* Calculate number of block this chip */ + ni->block_count = blocks_per_chip; + + /* Calculate info table size */ + ni->state_table_size = ((ni->block_count + NMBM_BITMAP_BLOCKS_PER_UNIT - 1) / + NMBM_BITMAP_BLOCKS_PER_UNIT) * NMBM_BITMAP_UNIT_SIZE; + ni->mapping_table_size = ni->block_count * sizeof(*ni->block_mapping); + + ni->info_table_size = ALIGN(sizeof(ni->info_table), + bmtd.pg_size); + ni->info_table.state_table_off = ni->info_table_size; + + ni->info_table_size += ALIGN(ni->state_table_size, + bmtd.pg_size); + ni->info_table.mapping_table_off = ni->info_table_size; + + ni->info_table_size += ALIGN(ni->mapping_table_size, + bmtd.pg_size); + + ni->info_table_spare_blocks = nmbm_get_spare_block_count( + size2blk(ni, ni->info_table_size)); + + /* Assign memory to members */ + ptr = (uintptr_t)ni + sizeof(*ni); + + ni->info_table_cache = (void *)ptr; + ptr += ni->info_table_size; + + ni->block_state = (void *)ptr; + ptr += ni->state_table_size; + + ni->block_mapping = (void *)ptr; + ptr += ni->mapping_table_size; + + ni->page_cache = bmtd.data_buf; + + /* Initialize block state table */ + ni->block_state_changed = 0; + memset(ni->block_state, 0xff, ni->state_table_size); + + /* Initialize block mapping table */ + ni->block_mapping_changed = 0; +} + +/* + * nmbm_attach - Attach to a lower device + * @ni: NMBM instance structure + */ +static int nmbm_attach(struct nmbm_instance *ni) +{ + bool success; + + if (!ni) + return -EINVAL; + + /* Initialize NMBM instance */ + nmbm_init_structure(ni); + + success = nmbm_find_signature(ni, &ni->signature, &ni->signature_ba); + if (!success) { + if (!ni->force_create) { + nlog_err(ni, "Signature not found\n"); + return -ENODEV; + } + + success = nmbm_create_new(ni); + if (!success) + return -ENODEV; + + return 0; + } + + nlog_info(ni, "Signature found at block %u [0x%08llx]\n", + ni->signature_ba, ba2addr(ni, ni->signature_ba)); + + if (ni->signature.header.version != NMBM_VER) { + nlog_err(ni, "NMBM version %u.%u is not supported\n", + NMBM_VERSION_MAJOR_GET(ni->signature.header.version), + NMBM_VERSION_MINOR_GET(ni->signature.header.version)); + return -EINVAL; + } + + if (ni->signature.nand_size != bmtd.total_blks << bmtd.blk_shift || + ni->signature.block_size != bmtd.blk_size || + ni->signature.page_size != bmtd.pg_size || + ni->signature.spare_size != bmtd.mtd->oobsize) { + nlog_err(ni, "NMBM configuration mismatch\n"); + return -EINVAL; + } + + success = nmbm_load_existing(ni); + if (!success) + return -ENODEV; + + return 0; +} + +static bool remap_block_nmbm(u16 block, u16 mapped_block, int copy_len) +{ + struct nmbm_instance *ni = bmtd.ni; + int new_block; + + if (block >= ni->data_block_count) + return false; + + nmbm_set_block_state(ni, mapped_block, BLOCK_ST_BAD); + if (!nmbm_map_block(ni, block)) + return false; + + new_block = ni->block_mapping[block]; + bbt_nand_erase(new_block); + if (copy_len > 0) + bbt_nand_copy(new_block, mapped_block, copy_len); + nmbm_update_info_table(ni); + + return true; +} + +static int get_mapping_block_index_nmbm(int block) +{ + struct nmbm_instance *ni = bmtd.ni; + + if (block >= ni->data_block_count) + return -1; + + return ni->block_mapping[block]; +} + +static int mtk_bmt_init_nmbm(struct device_node *np) +{ + struct nmbm_instance *ni; + int ret; + + ni = kzalloc(nmbm_calc_structure_size(), GFP_KERNEL); + if (!ni) + return -ENOMEM; + + bmtd.ni = ni; + + if (of_property_read_u32(np, "mediatek,bmt-max-ratio", &ni->max_ratio)) + ni->max_ratio = 1; + if (of_property_read_u32(np, "mediatek,bmt-max-reserved-blocks", + &ni->max_reserved_blocks)) + ni->max_reserved_blocks = 256; + if (of_property_read_bool(np, "mediatek,empty-page-ecc-protected")) + ni->empty_page_ecc_ok = true; + if (of_property_read_bool(np, "mediatek,bmt-force-create")) + ni->force_create = true; + + ret = nmbm_attach(ni); + if (ret) + goto out; + + bmtd.mtd->size = ni->data_block_count << bmtd.blk_shift; + + return 0; + +out: + kfree(ni); + bmtd.ni = NULL; + + return ret; +} + +static int mtk_bmt_debug_nmbm(void *data, u64 val) +{ + struct nmbm_instance *ni = bmtd.ni; + int i; + + switch (val) { + case 0: + for (i = 1; i < ni->data_block_count; i++) { + if (ni->block_mapping[i] < ni->mapping_blocks_ba) + continue; + + printk("remap [%x->%x]\n", i, ni->block_mapping[i]); + } + } + + return 0; +} + +static void unmap_block_nmbm(u16 block) +{ + struct nmbm_instance *ni = bmtd.ni; + int start, offset; + int new_block; + + if (block >= ni->data_block_count) + return; + + start = block; + offset = 0; + while (ni->block_mapping[start] >= ni->mapping_blocks_ba) { + start--; + offset++; + if (start < 0) + return; + } + + if (!offset) + return; + + new_block = ni->block_mapping[start] + offset; + nmbm_set_block_state(ni, new_block, BLOCK_ST_GOOD); + ni->block_mapping[block] = new_block; + ni->block_mapping_changed++; + + new_block = ni->signature_ba - 1; + for (block = 0; block < ni->data_block_count; block++) { + int cur = ni->block_mapping[block]; + + if (cur < ni->mapping_blocks_ba) + continue; + + if (cur <= new_block) + new_block = cur - 1; + } + + ni->mapping_blocks_top_ba = new_block; + + nmbm_update_info_table(ni); +} + +const struct mtk_bmt_ops mtk_bmt_nmbm_ops = { + .init = mtk_bmt_init_nmbm, + .remap_block = remap_block_nmbm, + .unmap_block = unmap_block_nmbm, + .get_mapping_block = get_mapping_block_index_nmbm, + .debug = mtk_bmt_debug_nmbm, +}; diff --git a/target/linux/generic/hack-5.10/430-mtk-bmt-support.patch b/target/linux/generic/hack-5.10/430-mtk-bmt-support.patch index 50efb5a48a..62ddd66bf2 100644 --- a/target/linux/generic/hack-5.10/430-mtk-bmt-support.patch +++ b/target/linux/generic/hack-5.10/430-mtk-bmt-support.patch @@ -17,7 +17,7 @@ nandcore-objs := core.o bbt.o obj-$(CONFIG_MTD_NAND_CORE) += nandcore.o -+obj-$(CONFIG_MTD_NAND_MTK_BMT) += mtk_bmt.o mtk_bmt_v2.o mtk_bmt_bbt.o ++obj-$(CONFIG_MTD_NAND_MTK_BMT) += mtk_bmt.o mtk_bmt_v2.o mtk_bmt_bbt.o mtk_bmt_nmbm.o obj-y += onenand/ obj-y += raw/ |