From: Felix Fietkau Date: Thu, 9 Apr 2020 07:53:24 +0000 (+0200) Subject: mediatek: implement bad-block management table support X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=11425c9de29c8b9c5e4d7eec163a6afbb7fbdce2;p=openwrt%2Fstaging%2Fjow.git mediatek: implement bad-block management table support Signed-off-by: Felix Fietkau --- diff --git a/target/linux/mediatek/dts/mt7622-elecom-wrc-2533gent.dts b/target/linux/mediatek/dts/mt7622-elecom-wrc-2533gent.dts index 2f3e5b1fb0..d41bca6305 100644 --- a/target/linux/mediatek/dts/mt7622-elecom-wrc-2533gent.dts +++ b/target/linux/mediatek/dts/mt7622-elecom-wrc-2533gent.dts @@ -506,6 +506,8 @@ pinctrl-0 = <&serial_nand_pins>; status = "okay"; + mediatek,bmt-v2; + spi_nand@0 { #address-cells = <1>; #size-cells = <1>; diff --git a/target/linux/mediatek/mt7622/config-5.4 b/target/linux/mediatek/mt7622/config-5.4 index 6ca00d017a..fbd72a7c39 100644 --- a/target/linux/mediatek/mt7622/config-5.4 +++ b/target/linux/mediatek/mt7622/config-5.4 @@ -399,6 +399,7 @@ CONFIG_MT753X_GSW=y CONFIG_MTD_NAND_CORE=y CONFIG_MTD_NAND_ECC_SW_HAMMING=y CONFIG_MTD_NAND_MTK=y +CONFIG_MTD_NAND_MTK_BMT=y CONFIG_MTD_RAW_NAND=y CONFIG_MTD_SPI_NAND=y CONFIG_MTD_SPI_NOR=y diff --git a/target/linux/mediatek/mt7623/config-5.4 b/target/linux/mediatek/mt7623/config-5.4 index dbd3055d3b..839eb71008 100644 --- a/target/linux/mediatek/mt7623/config-5.4 +++ b/target/linux/mediatek/mt7623/config-5.4 @@ -332,6 +332,7 @@ CONFIG_MODULES_USE_ELF_REL=y # CONFIG_MT753X_GSW is not set CONFIG_MTD_BLOCK2MTD=y CONFIG_MTD_CMDLINE_PARTS=y +# CONFIG_MTD_NAND_MTK_BMT is not set CONFIG_MTD_SPI_NOR=y CONFIG_MTD_SPLIT_FIRMWARE=y CONFIG_MTD_SPLIT_UIMAGE_FW=y diff --git a/target/linux/mediatek/mt7629/config-5.4 b/target/linux/mediatek/mt7629/config-5.4 index 7fe01d1748..6ecde5ced6 100644 --- a/target/linux/mediatek/mt7629/config-5.4 +++ b/target/linux/mediatek/mt7629/config-5.4 @@ -240,6 +240,7 @@ CONFIG_MT753X_GSW=y CONFIG_MTD_NAND_CORE=y CONFIG_MTD_NAND_ECC_SW_HAMMING=y CONFIG_MTD_NAND_MTK=y +# CONFIG_MTD_NAND_MTK_BMT is not set CONFIG_MTD_RAW_NAND=y CONFIG_MTD_SPI_NAND=y CONFIG_MTD_SPI_NOR=y diff --git a/target/linux/mediatek/patches-5.4/0310-mtk-bmt-support.patch b/target/linux/mediatek/patches-5.4/0310-mtk-bmt-support.patch new file mode 100644 index 0000000000..2a23f8c3dc --- /dev/null +++ b/target/linux/mediatek/patches-5.4/0310-mtk-bmt-support.patch @@ -0,0 +1,837 @@ +--- a/drivers/mtd/nand/Kconfig ++++ b/drivers/mtd/nand/Kconfig +@@ -5,3 +5,7 @@ config MTD_NAND_CORE + source "drivers/mtd/nand/onenand/Kconfig" + source "drivers/mtd/nand/raw/Kconfig" + source "drivers/mtd/nand/spi/Kconfig" ++ ++config MTD_NAND_MTK_BMT ++ bool "Support MediaTek NAND Bad-block Management Table" ++ default n +--- a/drivers/mtd/nand/Makefile ++++ b/drivers/mtd/nand/Makefile +@@ -2,6 +2,7 @@ + + nandcore-objs := core.o bbt.o + obj-$(CONFIG_MTD_NAND_CORE) += nandcore.o ++obj-$(CONFIG_MTD_NAND_MTK_BMT) += mtk_bmt.o + + obj-y += onenand/ + obj-y += raw/ +--- /dev/null ++++ b/drivers/mtd/nand/mtk_bmt.c +@@ -0,0 +1,766 @@ ++/* ++ * Copyright (c) 2017 MediaTek Inc. ++ * Author: Xiangsheng Hou ++ * Copyright (c) 2020 Felix Fietkau ++ * ++ * 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. ++ * ++ * This program is distributed in the hope that it will be useful, ++ * but WITHOUT ANY WARRANTY; without even the implied warranty of ++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ++ * GNU General Public License for more details. ++ */ ++ ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++ ++#define MAIN_SIGNATURE_OFFSET 0 ++#define OOB_SIGNATURE_OFFSET 1 ++#define BBPOOL_RATIO 2 ++ ++#define BBT_LOG(fmt, ...) pr_debug("[BBT][%s|%d] "fmt"\n", __func__, __LINE__, ##__VA_ARGS__) ++ ++/* Maximum 8k blocks */ ++#define BB_TABLE_MAX 0x2000U ++#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 bbbt { ++ char signature[3]; ++ /* This version is used to distinguish the legacy and new algorithm */ ++#define BBMT_VERSION 2 ++ unsigned char version; ++ /* Below 2 tables will be written in SLC */ ++ u16 bb_tbl[BB_TABLE_MAX]; ++ struct bbmt { ++ u16 block; ++#define NO_MAPPED 0 ++#define NORMAL_MAPPED 1 ++#define BMT_MAPPED 2 ++ u16 mapped; ++ } bmt_tbl[BMT_TABLE_MAX]; ++}; ++ ++static struct bmt_desc { ++ struct mtd_info *mtd; ++ ++ int (*_read_oob) (struct mtd_info *mtd, loff_t from, ++ struct mtd_oob_ops *ops); ++ int (*_write_oob) (struct mtd_info *mtd, loff_t to, ++ struct mtd_oob_ops *ops); ++ const struct nand_ops *nand_ops; ++ ++ struct bbbt *bbt; ++ ++ struct dentry *debugfs_dir; ++ ++ u32 pg_size; ++ u32 blk_size; ++ u16 pg_shift; ++ u16 blk_shift; ++ /* bbt logical address */ ++ u16 pool_lba; ++ /* bbt physical address */ ++ u16 pool_pba; ++ /* Maximum count of bad blocks that the vendor guaranteed */ ++ u16 bb_max; ++ /* Total blocks of the Nand Chip */ ++ u16 total_blks; ++ /* The block(n) BMT is located at (bmt_tbl[n]) */ ++ u16 bmt_blk_idx; ++ /* How many pages needs to store 'struct bbbt' */ ++ u32 bmt_pgs; ++ ++ /* to compensate for driver level remapping */ ++ u8 oob_offset; ++} bmtd = {0}; ++ ++static unsigned char *nand_bbt_buf; ++static unsigned char *nand_data_buf; ++ ++/* -------- Unit conversions -------- */ ++static inline u32 blk_pg(u16 block) ++{ ++ return (u32)(block << (bmtd.blk_shift - bmtd.pg_shift)); ++} ++ ++/* -------- Nand operations wrapper -------- */ ++static inline int ++bbt_nand_read(u32 page, unsigned char *dat, int dat_len, ++ unsigned char *fdm, int fdm_len) ++{ ++ struct mtd_oob_ops ops = { ++ .mode = MTD_OPS_PLACE_OOB, ++ .ooboffs = bmtd.oob_offset, ++ .oobbuf = fdm, ++ .ooblen = fdm_len, ++ .datbuf = dat, ++ .len = dat_len, ++ }; ++ ++ return bmtd._read_oob(bmtd.mtd, page << bmtd.pg_shift, &ops); ++} ++ ++static inline int bbt_nand_erase(u16 block) ++{ ++ struct nand_device *nand = mtd_to_nanddev(bmtd.mtd); ++ loff_t addr = (loff_t)block << bmtd.blk_shift; ++ struct nand_pos pos; ++ ++ nanddev_offs_to_pos(nand, addr, &pos); ++ return bmtd.nand_ops->erase(nand, &pos); ++} ++ ++/* -------- Bad Blocks Management -------- */ ++static int ++read_bmt(u16 block, unsigned char *dat, unsigned char *fdm, int fdm_len) ++{ ++ u32 len = bmtd.bmt_pgs << bmtd.pg_shift; ++ ++ return bbt_nand_read(blk_pg(block), dat, len, fdm, fdm_len); ++} ++ ++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, ++ .datbuf = dat, ++ .len = bmtd.bmt_pgs << bmtd.pg_shift, ++ }; ++ loff_t addr = (loff_t)block << bmtd.blk_shift; ++ ++ return bmtd._write_oob(bmtd.mtd, addr, &ops); ++} ++ ++static u16 find_valid_block(u16 block) ++{ ++ u8 fdm[4]; ++ int ret; ++ int loop = 0; ++ ++retry: ++ if (block >= bmtd.total_blks) ++ return 0; ++ ++ ret = bbt_nand_read(blk_pg(block), nand_data_buf, bmtd.pg_size, ++ fdm, sizeof(fdm)); ++ /* Read the 1st byte of FDM to judge whether it's a bad ++ * or not ++ */ ++ if (ret || fdm[0] != 0xff) { ++ pr_info("nand: found bad block 0x%x\n", block); ++ if (loop >= bmtd.bb_max) { ++ pr_info("nand: FATAL ERR: too many bad blocks!!\n"); ++ return 0; ++ } ++ ++ loop++; ++ block++; ++ goto retry; ++ } ++ ++ return block; ++} ++ ++/* Find out all bad blocks, and fill in the mapping table */ ++static int scan_bad_blocks(struct bbbt *bbt) ++{ ++ int i; ++ u16 block = 0; ++ ++ /* First time download, the block0 MUST NOT be a bad block, ++ * this is guaranteed by vendor ++ */ ++ bbt->bb_tbl[0] = 0; ++ ++ /* ++ * Construct the mapping table of Normal data area(non-PMT/BMTPOOL) ++ * G - Good block; B - Bad block ++ * --------------------------- ++ * physical |G|G|B|G|B|B|G|G|G|G|B|G|B| ++ * --------------------------- ++ * What bb_tbl[i] looks like: ++ * physical block(i): ++ * 0 1 2 3 4 5 6 7 8 9 a b c ++ * mapped block(bb_tbl[i]): ++ * 0 1 3 6 7 8 9 b ...... ++ * ATTENTION: ++ * If new bad block ocurred(n), search bmt_tbl to find ++ * a available block(x), and fill in the bb_tbl[n] = x; ++ */ ++ for (i = 1; i < bmtd.pool_lba; i++) { ++ bbt->bb_tbl[i] = find_valid_block(bbt->bb_tbl[i - 1] + 1); ++ BBT_LOG("bb_tbl[0x%x] = 0x%x", i, bbt->bb_tbl[i]); ++ if (bbt->bb_tbl[i] == 0) ++ return -1; ++ } ++ ++ /* Physical Block start Address of BMT pool */ ++ bmtd.pool_pba = bbt->bb_tbl[i - 1] + 1; ++ if (bmtd.pool_pba >= bmtd.total_blks - 2) { ++ pr_info("nand: FATAL ERR: Too many bad blocks!!\n"); ++ return -1; ++ } ++ ++ BBT_LOG("pool_pba=0x%x", bmtd.pool_pba); ++ i = 0; ++ block = bmtd.pool_pba; ++ /* ++ * The bmt table is used for runtime bad block mapping ++ * G - Good block; B - Bad block ++ * --------------------------- ++ * physical |G|G|B|G|B|B|G|G|G|G|B|G|B| ++ * --------------------------- ++ * block: 0 1 2 3 4 5 6 7 8 9 a b c ++ * What bmt_tbl[i] looks like in initial state: ++ * i: ++ * 0 1 2 3 4 5 6 7 ++ * bmt_tbl[i].block: ++ * 0 1 3 6 7 8 9 b ++ * bmt_tbl[i].mapped: ++ * N N N N N N N B ++ * N - Not mapped(Available) ++ * M - Mapped ++ * B - BMT ++ * ATTENTION: ++ * BMT always in the last valid block in pool ++ */ ++ while ((block = find_valid_block(block)) != 0) { ++ bbt->bmt_tbl[i].block = block; ++ bbt->bmt_tbl[i].mapped = NO_MAPPED; ++ BBT_LOG("bmt_tbl[%d].block = 0x%x", i, block); ++ block++; ++ i++; ++ } ++ ++ /* i - How many available blocks in pool, which is the length of bmt_tbl[] ++ * bmtd.bmt_blk_idx - bmt_tbl[bmtd.bmt_blk_idx].block => the BMT block ++ */ ++ bmtd.bmt_blk_idx = i - 1; ++ bbt->bmt_tbl[bmtd.bmt_blk_idx].mapped = BMT_MAPPED; ++ ++ if (i < 1) { ++ pr_info("nand: FATAL ERR: no space to store BMT!!\n"); ++ return -1; ++ } ++ ++ pr_info("[BBT] %d available blocks in BMT pool\n", i); ++ ++ return 0; ++} ++ ++static bool is_valid_bmt(unsigned char *buf, unsigned char *fdm) ++{ ++ struct bbbt *bbt = (struct bbbt *)buf; ++ u8 *sig = (u8*)bbt->signature + MAIN_SIGNATURE_OFFSET; ++ ++ ++ if (memcmp(bbt->signature + MAIN_SIGNATURE_OFFSET, "BMT", 3) == 0 && ++ memcmp(fdm + OOB_SIGNATURE_OFFSET, "bmt", 3) == 0) { ++ if (bbt->version == BBMT_VERSION) ++ return true; ++ } ++ BBT_LOG("[BBT] BMT Version not match,upgrage preloader and uboot please! sig=%02x%02x%02x, fdm=%02x%02x%02x", ++ sig[0], sig[1], sig[2], ++ fdm[1], fdm[2], fdm[3]); ++ return false; ++} ++ ++static u16 get_bmt_index(struct bbmt *bmt) ++{ ++ int i = 0; ++ ++ while (bmt[i].block != BMT_TBL_DEF_VAL) { ++ if (bmt[i].mapped == BMT_MAPPED) ++ return i; ++ i++; ++ } ++ return 0; ++} ++ ++static struct bbbt *scan_bmt(u16 block) ++{ ++ u8 fdm[4]; ++ ++ if (block < bmtd.pool_lba) ++ return NULL; ++ ++ if (read_bmt(block, nand_bbt_buf, fdm, sizeof(fdm))) ++ return scan_bmt(block - 1); ++ ++ if (is_valid_bmt(nand_bbt_buf, fdm)) { ++ bmtd.bmt_blk_idx = get_bmt_index(((struct bbbt *)nand_bbt_buf)->bmt_tbl); ++ if (bmtd.bmt_blk_idx == 0) { ++ pr_info("[BBT] FATAL ERR: bmt block index is wrong!\n"); ++ return NULL; ++ } ++ pr_info("[BBT] BMT.v2 is found at 0x%x\n", block); ++ return (struct bbbt *)nand_bbt_buf; ++ } else ++ return scan_bmt(block - 1); ++} ++ ++/* Write the Burner Bad Block Table to Nand Flash ++ * n - write BMT to bmt_tbl[n] ++ */ ++static u16 upload_bmt(struct bbbt *bbt, int n) ++{ ++ u16 block; ++ ++retry: ++ if (n < 0 || bbt->bmt_tbl[n].mapped == NORMAL_MAPPED) { ++ pr_info("nand: FATAL ERR: no space to store BMT!\n"); ++ return (u16)-1; ++ } ++ ++ block = bbt->bmt_tbl[n].block; ++ BBT_LOG("n = 0x%x, block = 0x%x", n, block); ++ if (bbt_nand_erase(block)) { ++ bbt->bmt_tbl[n].block = 0; ++ /* erase failed, try the previous block: bmt_tbl[n - 1].block */ ++ n--; ++ goto retry; ++ } ++ ++ /* The signature offset is fixed set to 0, ++ * oob signature offset is fixed set to 1 ++ */ ++ memcpy(bbt->signature + MAIN_SIGNATURE_OFFSET, "BMT", 3); ++ bbt->version = BBMT_VERSION; ++ ++ if (write_bmt(block, (unsigned char *)bbt)) { ++ bbt->bmt_tbl[n].block = 0; ++ ++ /* write failed, try the previous block in bmt_tbl[n - 1] */ ++ n--; ++ goto retry; ++ } ++ ++ /* Return the current index(n) of BMT pool (bmt_tbl[n]) */ ++ return n; ++} ++ ++static u16 find_valid_block_in_pool(struct bbbt *bbt) ++{ ++ int i; ++ ++ if (bmtd.bmt_blk_idx == 0) ++ goto error; ++ ++ for (i = 0; i < bmtd.bmt_blk_idx; i++) { ++ if (bbt->bmt_tbl[i].block != 0 && bbt->bmt_tbl[i].mapped == NO_MAPPED) { ++ bbt->bmt_tbl[i].mapped = NORMAL_MAPPED; ++ return bbt->bmt_tbl[i].block; ++ } ++ } ++ ++error: ++ pr_info("nand: FATAL ERR: BMT pool is run out!\n"); ++ return 0; ++} ++ ++/* 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) ++{ ++ u16 mapped_blk; ++ struct bbbt *bbt; ++ ++ bbt = bmtd.bbt; ++ mapped_blk = find_valid_block_in_pool(bbt); ++ if (mapped_blk == 0) ++ return false; ++ ++ /* Map new bad block to available block in pool */ ++ bbt->bb_tbl[block] = mapped_blk; ++ bmtd.bmt_blk_idx = upload_bmt(bbt, bmtd.bmt_blk_idx); ++ ++ return true; ++} ++ ++u16 get_mapping_block_index(int block) ++{ ++ int mapping_block; ++ ++ if (block < bmtd.pool_lba) ++ mapping_block = bmtd.bbt->bb_tbl[block]; ++ else ++ mapping_block = block; ++ BBT_LOG("0x%x mapped to 0x%x", block, mapping_block); ++ ++ return mapping_block; ++} ++ ++static int ++mtk_bmt_read(struct mtd_info *mtd, loff_t from, ++ struct mtd_oob_ops *ops) ++{ ++ struct mtd_oob_ops cur_ops = *ops; ++ int retry_count = 0; ++ loff_t cur_from; ++ int ret; ++ ++ ops->retlen = 0; ++ ops->oobretlen = 0; ++ ++ while (ops->retlen < ops->len || ops->oobretlen < ops->ooblen) { ++ u32 offset = from & (bmtd.blk_size - 1); ++ u32 block = from >> bmtd.blk_shift; ++ u32 cur_block; ++ ++ cur_block = get_mapping_block_index(block); ++ cur_from = ((loff_t)cur_block << bmtd.blk_shift) + offset; ++ ++ cur_ops.oobretlen = 0; ++ cur_ops.retlen = 0; ++ cur_ops.len = min_t(u32, mtd->erasesize - offset, ++ ops->len - ops->retlen); ++ ret = bmtd._read_oob(mtd, cur_from, &cur_ops); ++ if (ret < 0) { ++ update_bmt(block); ++ if (retry_count++ < 10) ++ continue; ++ ++ return ret; ++ } ++ ++ ops->retlen += cur_ops.retlen; ++ ops->oobretlen += cur_ops.oobretlen; ++ ++ cur_ops.datbuf += cur_ops.retlen; ++ cur_ops.oobbuf += cur_ops.oobretlen; ++ cur_ops.ooblen -= cur_ops.oobretlen; ++ ++ if (!cur_ops.len) ++ cur_ops.len = mtd->erasesize - offset; ++ ++ from += cur_ops.len; ++ retry_count = 0; ++ } ++ ++ return 0; ++} ++ ++static int ++mtk_bmt_write(struct mtd_info *mtd, loff_t to, ++ struct mtd_oob_ops *ops) ++{ ++ struct mtd_oob_ops cur_ops = *ops; ++ int retry_count = 0; ++ loff_t cur_to; ++ int ret; ++ ++ ops->retlen = 0; ++ ops->oobretlen = 0; ++ ++ while (ops->retlen < ops->len || ops->oobretlen < ops->ooblen) { ++ u32 offset = to & (bmtd.blk_size - 1); ++ u32 block = to >> bmtd.blk_shift; ++ u32 cur_block; ++ ++ cur_block = get_mapping_block_index(block); ++ cur_to = ((loff_t)cur_block << bmtd.blk_shift) + offset; ++ ++ cur_ops.oobretlen = 0; ++ cur_ops.retlen = 0; ++ cur_ops.len = min_t(u32, bmtd.blk_size - offset, ++ ops->len - ops->retlen); ++ ret = bmtd._write_oob(mtd, cur_to, &cur_ops); ++ if (ret < 0) { ++ update_bmt(block); ++ if (retry_count++ < 10) ++ continue; ++ ++ return ret; ++ } ++ ++ ops->retlen += cur_ops.retlen; ++ ops->oobretlen += cur_ops.oobretlen; ++ ++ cur_ops.datbuf += cur_ops.retlen; ++ cur_ops.oobbuf += cur_ops.oobretlen; ++ cur_ops.ooblen -= cur_ops.oobretlen; ++ ++ if (!cur_ops.len) ++ cur_ops.len = mtd->erasesize - offset; ++ ++ to += cur_ops.len; ++ retry_count = 0; ++ } ++ ++ return 0; ++} ++ ++ ++ ++static int ++mtk_bmt_erase(struct nand_device *nand, const struct nand_pos *pos) ++{ ++ struct nand_pos new_pos = *pos; ++ int retry_count = 0; ++ int ret; ++ ++retry: ++ new_pos.eraseblock = get_mapping_block_index(pos->eraseblock); ++ ++ ret = bmtd.nand_ops->erase(nand, &new_pos); ++ if (ret) { ++ update_bmt(pos->eraseblock); ++ if (retry_count++ < 10) ++ goto retry; ++ } ++ ++ return ret; ++} ++ ++static bool ++mtk_bmt_isbad(struct nand_device *nand, const struct nand_pos *pos) ++{ ++ struct nand_pos new_pos = *pos; ++ int retry_count = 0; ++ bool ret; ++ ++retry: ++ new_pos.eraseblock = get_mapping_block_index(pos->eraseblock); ++ ++ ret = bmtd.nand_ops->isbad(nand, &new_pos); ++ if (ret) { ++ update_bmt(pos->eraseblock); ++ if (retry_count++ < 10) ++ goto retry; ++ } ++ ++ return ret; ++} ++ ++static int ++mtk_bmt_markbad(struct nand_device *nand, const struct nand_pos *pos) ++{ ++ struct nand_pos new_pos = *pos; ++ ++ new_pos.eraseblock = get_mapping_block_index(new_pos.eraseblock); ++ update_bmt(pos->eraseblock); ++ ++ return bmtd.nand_ops->markbad(nand, &new_pos); ++} ++ ++static void ++mtk_bmt_replace_ops(struct mtd_info *mtd) ++{ ++ static const struct nand_ops mtk_bmt_nand_ops = { ++ .erase = mtk_bmt_erase, ++ .isbad = mtk_bmt_isbad, ++ .markbad = mtk_bmt_markbad, ++ }; ++ struct nand_device *nand = mtd_to_nanddev(mtd); ++ ++ bmtd.nand_ops = nand->ops; ++ bmtd._read_oob = mtd->_read_oob; ++ bmtd._write_oob = mtd->_write_oob; ++ ++ mtd->_read_oob = mtk_bmt_read; ++ mtd->_write_oob = mtk_bmt_write; ++ nand->ops = &mtk_bmt_nand_ops; ++} ++ ++static int mtk_bmt_debug_mark_good(void *data, u64 val) ++{ ++ u32 block = val >> bmtd.blk_shift; ++ ++ bmtd.bbt->bb_tbl[block] = block; ++ bmtd.bmt_blk_idx = upload_bmt(bmtd.bbt, bmtd.bmt_blk_idx); ++ ++ return 0; ++} ++ ++static int mtk_bmt_debug_mark_bad(void *data, u64 val) ++{ ++ u32 block = val >> bmtd.blk_shift; ++ ++ update_bmt(block); ++ ++ return 0; ++} ++ ++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"); ++ ++static void ++mtk_bmt_add_debugfs(void) ++{ ++ struct dentry *dir; ++ ++ dir = bmtd.debugfs_dir = debugfs_create_dir("mtk-bmt", NULL); ++ if (!dir) ++ return; ++ ++ debugfs_create_file_unsafe("mark_good", S_IWUSR, dir, NULL, &fops_mark_good); ++ debugfs_create_file_unsafe("mark_bad", S_IWUSR, dir, NULL, &fops_mark_bad); ++} ++ ++void mtk_bmt_detach(struct mtd_info *mtd) ++{ ++ struct nand_device *nand = mtd_to_nanddev(mtd); ++ ++ if (bmtd.mtd != mtd) ++ return; ++ ++ if (bmtd.debugfs_dir) ++ debugfs_remove_recursive(bmtd.debugfs_dir); ++ bmtd.debugfs_dir = NULL; ++ ++ kfree(nand_bbt_buf); ++ kfree(nand_data_buf); ++ ++ mtd->_read_oob = bmtd._read_oob; ++ mtd->_write_oob = bmtd._write_oob; ++ mtd->size = bmtd.total_blks << bmtd.blk_shift; ++ nand->ops = bmtd.nand_ops; ++ ++ 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) ++{ ++ struct device_node *np; ++ struct bbbt *bbt; ++ u32 bufsz; ++ u32 block; ++ u16 total_blocks, pmt_block; ++ int ret = 0; ++ u32 bmt_pool_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; ++ ++ if (of_property_read_u32(np, "mediatek,bmt-pool-size", ++ &bmt_pool_size) != 0) ++ bmt_pool_size = 80; ++ ++ if (of_property_read_u8(np, "mediatek,bmt-oob-offset", ++ &bmtd.oob_offset) != 0) ++ bmtd.oob_offset = 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; ++ total_blocks = mtd->size >> bmtd.blk_shift; ++ pmt_block = total_blocks - bmt_pool_size - 2; ++ ++ mtd->size = pmt_block << bmtd.blk_shift; ++ ++ /* ++ * --------------------------------------- ++ * | PMT(2blks) | BMT POOL(totalblks * 2%) | ++ * --------------------------------------- ++ * ^ ^ ++ * | | ++ * pmt_block pmt_block + 2blocks(pool_lba) ++ * ++ * ATTETION!!!!!! ++ * The blocks ahead of the boundary block are stored in bb_tbl ++ * and blocks behind are stored in bmt_tbl ++ */ ++ ++ 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), 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; ++ } ++ ++ 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) { ++ /* 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; ++ } ++ ++ bbt = (struct bbbt *)nand_bbt_buf; ++ memset(bbt->bmt_tbl, BMT_TBL_DEF_VAL, sizeof(bbt->bmt_tbl)); ++ ++ if (scan_bad_blocks(bbt)) { ++ ret = -1; ++ goto error; ++ } ++ ++ /* BMT always in the last valid block in pool */ ++ bmtd.bmt_blk_idx = upload_bmt(bbt, bmtd.bmt_blk_idx); ++ block = bbt->bmt_tbl[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; ++ } ++ } ++ mtk_bmt_add_debugfs(); ++ ++ bmtd.bbt = bbt; ++ return 0; ++ ++error: ++ mtk_bmt_detach(mtd); ++ return ret; ++} ++ ++ ++MODULE_LICENSE("GPL"); ++MODULE_AUTHOR("Xiangsheng Hou , Felix Fietkau "); ++MODULE_DESCRIPTION("Bad Block mapping management v2 for MediaTek NAND Flash Driver"); ++ +--- a/drivers/mtd/nand/spi/core.c ++++ b/drivers/mtd/nand/spi/core.c +@@ -18,6 +18,7 @@ + #include + #include + #include ++#include + + static int spinand_read_reg_op(struct spinand_device *spinand, u8 reg, u8 *val) + { +@@ -1099,6 +1100,8 @@ static int spinand_probe(struct spi_mem + if (ret) + return ret; + ++ mtk_bmt_attach(mtd); ++ + ret = mtd_device_register(mtd, NULL, 0); + if (ret) + goto err_spinand_cleanup; +@@ -1124,6 +1127,7 @@ static int spinand_remove(struct spi_mem + if (ret) + return ret; + ++ mtk_bmt_detach(mtd); + spinand_cleanup(spinand); + + return 0; +--- /dev/null ++++ b/include/linux/mtd/mtk_bmt.h +@@ -0,0 +1,18 @@ ++#ifndef __MTK_BMT_H ++#define __MTK_BMT_H ++ ++#ifdef CONFIG_MTD_NAND_MTK_BMT ++int mtk_bmt_attach(struct mtd_info *mtd); ++void mtk_bmt_detach(struct mtd_info *mtd); ++#else ++static inline int mtk_bmt_attach(struct mtd_info *mtd) ++{ ++ return 0; ++} ++ ++static inline void mtk_bmt_detach(struct mtd_info *mtd) ++{ ++} ++#endif ++ ++#endif