From ff6b4f2cfbc36efb2f3e61fd0c279de8527aa241 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Tue, 11 Jan 2022 12:45:52 +0100 Subject: [PATCH] kernel: mtk_bmt: add abstraction for supporting other formats Preparation for supporting remapping on MT7621 Signed-off-by: Felix Fietkau --- .../generic/files/drivers/mtd/nand/mtk_bmt.c | 212 ++++++++++-------- 1 file changed, 122 insertions(+), 90 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 2140c619da9..7f55c1810dc 100644 --- a/target/linux/generic/files/drivers/mtd/nand/mtk_bmt.c +++ b/target/linux/generic/files/drivers/mtd/nand/mtk_bmt.c @@ -35,10 +35,15 @@ #define BMT_TABLE_MAX (BB_TABLE_MAX * BBPOOL_RATIO / 100) #define BMT_TBL_DEF_VAL 0x0 -/* - * Burner Bad Block Table - * --------- Only support SLC Nand Chips!!!!!!!!!!! ---------- - */ +struct mtk_bmt_ops { + char *sig; + unsigned int sig_len; + int (*init)(struct device_node *np); + bool (*remap_block)(u16 block, u16 mapped_block, int copy_len); + void (*unmap_block)(u16 block); + u16 (*get_mapping_block)(int block); + int (*debug)(void *data, u64 val); +}; struct bbbt { char signature[3]; @@ -68,6 +73,8 @@ static struct bmt_desc { int (*_block_isbad) (struct mtd_info *mtd, loff_t ofs); int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs); + const struct mtk_bmt_ops *ops; + struct bbbt *bbt; struct dentry *debugfs_dir; @@ -198,8 +205,8 @@ static int write_bmt(u16 block, unsigned char *dat) struct mtd_oob_ops ops = { .mode = MTD_OPS_PLACE_OOB, .ooboffs = OOB_SIGNATURE_OFFSET + bmtd.oob_offset, - .oobbuf = "bmt", - .ooblen = 3, + .oobbuf = bmtd.ops->sig, + .ooblen = bmtd.ops->sig_len, .datbuf = dat, .len = bmtd.bmt_pgs << bmtd.pg_shift, }; @@ -438,7 +445,7 @@ error: /* We met a bad block, mark it as bad and map it to a valid block in pool, * if it's a write failure, we need to write the data to mapped block */ -static bool update_bmt(u16 block, int copy_len) +static bool remap_block_v2(u16 block, u16 mapped_block, int copy_len) { u16 mapped_blk; struct bbbt *bbt; @@ -478,7 +485,8 @@ mapping_block_in_range(int block) return false; } -u16 get_mapping_block_index(int block) +static u16 +get_mapping_block_index_v2(int block) { if (block >= bmtd.pool_lba) return block; @@ -498,6 +506,7 @@ mtk_bmt_read(struct mtd_info *mtd, loff_t from, loff_t cur_from; int ret = 0; int max_bitflips = 0; + int start, end; ops->retlen = 0; ops->oobretlen = 0; @@ -509,7 +518,7 @@ mtk_bmt_read(struct mtd_info *mtd, loff_t from, u32 block = from >> bmtd.blk_shift; u32 cur_block; - cur_block = get_mapping_block_index(block); + cur_block = bmtd.ops->get_mapping_block(block); cur_from = ((loff_t)cur_block << bmtd.blk_shift) + offset; cur_ops.oobretlen = 0; @@ -522,7 +531,7 @@ mtk_bmt_read(struct mtd_info *mtd, loff_t from, else max_bitflips = max_t(int, max_bitflips, cur_ret); if (cur_ret < 0 && !mtd_is_bitflip(cur_ret)) { - update_bmt(block, mtd->erasesize); + bmtd.ops->remap_block(block, cur_block, mtd->erasesize); if (retry_count++ < 10) continue; @@ -530,8 +539,8 @@ mtk_bmt_read(struct mtd_info *mtd, loff_t from, } if (cur_ret >= mtd->bitflip_threshold && - mapping_block_in_range(block)) - update_bmt(block, mtd->erasesize); + mapping_block_in_range(block, &start, &end)) + bmtd.ops->remap_block(block, cur_block, mtd->erasesize); ops->retlen += cur_ops.retlen; ops->oobretlen += cur_ops.oobretlen; @@ -572,7 +581,7 @@ mtk_bmt_write(struct mtd_info *mtd, loff_t to, u32 block = to >> bmtd.blk_shift; u32 cur_block; - cur_block = get_mapping_block_index(block); + cur_block = bmtd.ops->get_mapping_block(block); cur_to = ((loff_t)cur_block << bmtd.blk_shift) + offset; cur_ops.oobretlen = 0; @@ -581,7 +590,7 @@ mtk_bmt_write(struct mtd_info *mtd, loff_t to, ops->len - ops->retlen); ret = bmtd._write_oob(mtd, cur_to, &cur_ops); if (ret < 0) { - update_bmt(block, offset); + bmtd.ops->remap_block(block, cur_block, offset); if (retry_count++ < 10) continue; @@ -622,11 +631,11 @@ mtk_bmt_mtd_erase(struct mtd_info *mtd, struct erase_info *instr) while (start_addr < end_addr) { orig_block = start_addr >> bmtd.blk_shift; - block = get_mapping_block_index(orig_block); + block = bmtd.ops->get_mapping_block(orig_block); mapped_instr.addr = (loff_t)block << bmtd.blk_shift; ret = bmtd._erase(mtd, &mapped_instr); if (ret) { - update_bmt(orig_block, 0); + bmtd.ops->remap_block(orig_block, block, 0); if (retry_count++ < 10) continue; instr->fail_addr = start_addr; @@ -647,10 +656,10 @@ mtk_bmt_block_isbad(struct mtd_info *mtd, loff_t ofs) int ret; retry: - block = get_mapping_block_index(orig_block); + block = bmtd.ops->get_mapping_block(orig_block); ret = bmtd._block_isbad(mtd, (loff_t)block << bmtd.blk_shift); if (ret) { - update_bmt(orig_block, bmtd.blk_size); + bmtd.ops->remap_block(orig_block, block, bmtd.blk_size); if (retry_count++ < 10) goto retry; } @@ -661,8 +670,10 @@ static int mtk_bmt_block_markbad(struct mtd_info *mtd, loff_t ofs) { u16 orig_block = ofs >> bmtd.blk_shift; - u16 block = get_mapping_block_index(orig_block); - update_bmt(orig_block, bmtd.blk_size); + u16 block = bmtd.ops->get_mapping_block(orig_block); + + bmtd.ops->remap_block(orig_block, block, bmtd.blk_size); + return bmtd._block_markbad(mtd, (loff_t)block << bmtd.blk_shift); } @@ -682,12 +693,16 @@ mtk_bmt_replace_ops(struct mtd_info *mtd) mtd->_block_markbad = mtk_bmt_block_markbad; } -static int mtk_bmt_debug_mark_good(void *data, u64 val) +static void +unmap_block_v2(u16 block) { - u32 block = val >> bmtd.blk_shift; - bmtd.bbt->bb_tbl[block] = block; bmtd.bmt_blk_idx = upload_bmt(bmtd.bbt, bmtd.bmt_blk_idx); +} + +static int mtk_bmt_debug_mark_good(void *data, u64 val) +{ + bmtd.ops->unmap_block(val >> bmtd.blk_shift); return 0; } @@ -695,8 +710,9 @@ static int mtk_bmt_debug_mark_good(void *data, u64 val) static int mtk_bmt_debug_mark_bad(void *data, u64 val) { u32 block = val >> bmtd.blk_shift; + u16 cur_block = bmtd.ops->get_mapping_block(block); - update_bmt(block, bmtd.blk_size); + bmtd.ops->remap_block(block, cur_block, bmtd.blk_size); return 0; } @@ -729,7 +745,7 @@ mtk_bmt_get_mapping_mask(void) return used; } -static int mtk_bmt_debug(void *data, u64 val) +static int mtk_bmt_debug_v2(void *data, u64 val) { struct bbmt *bbmt = bmt_tbl(bmtd.bbt); struct mtd_info *mtd = bmtd.mtd; @@ -794,6 +810,11 @@ static int mtk_bmt_debug(void *data, u64 val) return 0; } +static int mtk_bmt_debug(void *data, u64 val) +{ + return bmtd.ops->debug(data, val); +} + DEFINE_DEBUGFS_ATTRIBUTE(fops_mark_good, NULL, mtk_bmt_debug_mark_good, "%llu\n"); DEFINE_DEBUGFS_ATTRIBUTE(fops_mark_bad, NULL, mtk_bmt_debug_mark_bad, "%llu\n"); @@ -835,26 +856,11 @@ void mtk_bmt_detach(struct mtd_info *mtd) memset(&bmtd, 0, sizeof(bmtd)); } -/* total_blocks - The total count of blocks that the Nand Chip has */ -int mtk_bmt_attach(struct mtd_info *mtd) +static int mtk_bmt_init_v2(struct device_node *np) { - struct device_node *np; - struct bbbt *bbt; - u32 bufsz; - u32 block; - u16 total_blocks, pmt_block; - int ret = 0; u32 bmt_pool_size, bmt_table_size; - - if (bmtd.mtd) - return -ENOSPC; - - np = mtd_get_of_node(mtd); - if (!np) - return 0; - - if (!of_property_read_bool(np, "mediatek,bmt-v2")) - return 0; + u32 bufsz, block; + u16 pmt_block; if (of_property_read_u32(np, "mediatek,bmt-pool-size", &bmt_pool_size) != 0) @@ -868,22 +874,11 @@ int mtk_bmt_attach(struct mtd_info *mtd) &bmt_table_size) != 0) bmt_table_size = 0x2000U; - bmtd.remap_range = of_get_property(np, "mediatek,bmt-remap-range", - &bmtd.remap_range_len); - bmtd.remap_range_len /= 8; - - bmtd.mtd = mtd; - mtk_bmt_replace_ops(mtd); - bmtd.table_size = bmt_table_size; - bmtd.blk_size = mtd->erasesize; - bmtd.blk_shift = ffs(bmtd.blk_size) - 1; - bmtd.pg_size = mtd->writesize; - bmtd.pg_shift = ffs(bmtd.pg_size) - 1; - total_blocks = mtd->size >> bmtd.blk_shift; - pmt_block = total_blocks - bmt_pool_size - 2; - mtd->size = pmt_block << bmtd.blk_shift; + pmt_block = bmtd.total_blks - bmt_pool_size - 2; + + bmtd.mtd->size = pmt_block << bmtd.blk_shift; /* * --------------------------------------- @@ -899,66 +894,103 @@ int mtk_bmt_attach(struct mtd_info *mtd) */ bmtd.pool_lba = (u16)(pmt_block + 2); - bmtd.total_blks = total_blocks; bmtd.bb_max = bmtd.total_blks * BBPOOL_RATIO / 100; - /* 3 buffers we need */ bufsz = round_up(sizeof(struct bbbt) + bmt_table_size * sizeof(struct bbmt), bmtd.pg_size); bmtd.bmt_pgs = bufsz >> bmtd.pg_shift; nand_bbt_buf = kzalloc(bufsz, GFP_KERNEL); - nand_data_buf = kzalloc(bmtd.pg_size, GFP_KERNEL); - - if (!nand_bbt_buf || !nand_data_buf) { - pr_info("nand: FATAL ERR: allocate buffer failed!\n"); - ret = -1; - goto error; - } + if (!nand_bbt_buf) + return -ENOMEM; memset(nand_bbt_buf, 0xff, bufsz); - memset(nand_data_buf, 0xff, bmtd.pg_size); - - BBT_LOG("bbtbuf=0x%p(0x%x) dat=0x%p(0x%x)", - nand_bbt_buf, bufsz, nand_data_buf, bmtd.pg_size); - BBT_LOG("pool_lba=0x%x total_blks=0x%x bb_max=0x%x", - bmtd.pool_lba, bmtd.total_blks, bmtd.bb_max); /* Scanning start from the first page of the last block * of whole flash */ - bbt = scan_bmt(bmtd.total_blks - 1); - if (!bbt) { + bmtd.bbt = scan_bmt(bmtd.total_blks - 1); + if (!bmtd.bbt) { /* BMT not found */ if (bmtd.total_blks > BB_TABLE_MAX + BMT_TABLE_MAX) { pr_info("nand: FATAL: Too many blocks, can not support!\n"); - ret = -1; - goto error; + return -1; } - bbt = (struct bbbt *)nand_bbt_buf; - memset(bmt_tbl(bbt), BMT_TBL_DEF_VAL, bmtd.table_size * sizeof(struct bbmt)); + bmtd.bbt = (struct bbbt *)nand_bbt_buf; + memset(bmt_tbl(bmtd.bbt), BMT_TBL_DEF_VAL, + bmtd.table_size * sizeof(struct bbmt)); - if (scan_bad_blocks(bbt)) { - ret = -1; - goto error; - } + if (scan_bad_blocks(bmtd.bbt)) + return -1; /* BMT always in the last valid block in pool */ - bmtd.bmt_blk_idx = upload_bmt(bbt, bmtd.bmt_blk_idx); - block = bmt_tbl(bbt)[bmtd.bmt_blk_idx].block; + bmtd.bmt_blk_idx = upload_bmt(bmtd.bbt, bmtd.bmt_blk_idx); + block = bmt_tbl(bmtd.bbt)[bmtd.bmt_blk_idx].block; pr_notice("[BBT] BMT.v2 is written into PBA:0x%x\n", block); if (bmtd.bmt_blk_idx == 0) pr_info("nand: Warning: no available block in BMT pool!\n"); - else if (bmtd.bmt_blk_idx == (u16)-1) { - ret = -1; - goto error; - } + else if (bmtd.bmt_blk_idx == (u16)-1) + return -1; } - mtk_bmt_add_debugfs(); - bmtd.bbt = bbt; + return 0; +} + +int mtk_bmt_attach(struct mtd_info *mtd) +{ + static const struct mtk_bmt_ops v2_ops = { + .sig = "bmt", + .sig_len = 3, + .init = mtk_bmt_init_v2, + .remap_block = remap_block_v2, + .unmap_block = unmap_block_v2, + .get_mapping_block = get_mapping_block_index_v2, + .debug = mtk_bmt_debug_v2, + }; + struct device_node *np; + int ret = 0; + + if (bmtd.mtd) + return -ENOSPC; + + np = mtd_get_of_node(mtd); + if (!np) + return 0; + + if (of_property_read_bool(np, "mediatek,bmt-v2")) + bmtd.ops = &v2_ops; + else + return 0; + + bmtd.remap_range = of_get_property(np, "mediatek,bmt-remap-range", + &bmtd.remap_range_len); + bmtd.remap_range_len /= 8; + + bmtd.mtd = mtd; + mtk_bmt_replace_ops(mtd); + + bmtd.blk_size = mtd->erasesize; + bmtd.blk_shift = ffs(bmtd.blk_size) - 1; + bmtd.pg_size = mtd->writesize; + bmtd.pg_shift = ffs(bmtd.pg_size) - 1; + bmtd.total_blks = mtd->size >> bmtd.blk_shift; + + nand_data_buf = kzalloc(bmtd.pg_size, GFP_KERNEL); + if (!nand_data_buf) { + pr_info("nand: FATAL ERR: allocate buffer failed!\n"); + ret = -1; + goto error; + } + + memset(nand_data_buf, 0xff, bmtd.pg_size); + + ret = bmtd.ops->init(np); + if (ret) + goto error; + + mtk_bmt_add_debugfs(); return 0; error: -- 2.30.2