[openwrt/openwrt] kernel: split up mtk_bmt driver code
LEDE Commits
lede-commits at lists.infradead.org
Fri Mar 25 13:12:04 PDT 2022
nbd pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/601c7b4adb0f91005a8755bf9575c68ac623cc33
commit 601c7b4adb0f91005a8755bf9575c68ac623cc33
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Wed Mar 9 11:30:58 2022 +0100
kernel: split up mtk_bmt driver code
Keep a separate source file per variant
Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
.../linux/generic/files/drivers/mtd/nand/mtk_bmt.c | 821 +--------------------
.../linux/generic/files/drivers/mtd/nand/mtk_bmt.h | 124 ++++
.../generic/files/drivers/mtd/nand/mtk_bmt_bbt.c | 203 +++++
.../generic/files/drivers/mtd/nand/mtk_bmt_v2.c | 513 +++++++++++++
.../generic/hack-5.10/430-mtk-bmt-support.patch | 2 +-
5 files changed, 857 insertions(+), 806 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 7c06ee01f0..e7238ee62b 100644
--- a/target/linux/generic/files/drivers/mtd/nand/mtk_bmt.c
+++ b/target/linux/generic/files/drivers/mtd/nand/mtk_bmt.c
@@ -1,7 +1,7 @@
/*
* Copyright (c) 2017 MediaTek Inc.
* Author: Xiangsheng Hou <xiangsheng.hou at mediatek.com>
- * Copyright (c) 2020 Felix Fietkau <nbd at nbd.name>
+ * Copyright (c) 2020-2022 Felix Fietkau <nbd at nbd.name>
*
* 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
@@ -13,135 +13,16 @@
* GNU General Public License for more details.
*/
-#include <linux/slab.h>
-#include <linux/gfp.h>
-#include <linux/kernel.h>
-#include <linux/of.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/partitions.h>
-#include <linux/mtd/mtk_bmt.h>
#include <linux/module.h>
-#include <linux/debugfs.h>
+#include <linux/gfp.h>
+#include <linux/slab.h>
#include <linux/bits.h>
+#include "mtk_bmt.h"
-#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 bmtd.table_size
-#define BMT_TABLE_MAX (BB_TABLE_MAX * BBPOOL_RATIO / 100)
-#define BMT_TBL_DEF_VAL 0x0
-
-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];
- /* 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[];
-};
-
-struct bbmt {
- u16 block;
-#define NO_MAPPED 0
-#define NORMAL_MAPPED 1
-#define BMT_MAPPED 2
- u16 mapped;
-};
-
-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);
- int (*_erase) (struct mtd_info *mtd, struct erase_info *instr);
- 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;
-
- u32 table_size;
- 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;
-
- const __be32 *remap_range;
- int remap_range_len;
-
- /* 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));
-}
+struct bmt_desc bmtd = {};
/* -------- 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 mtd_info *mtd = bmtd.mtd;
- struct erase_info instr = {
- .addr = (loff_t)block << bmtd.blk_shift,
- .len = bmtd.blk_size,
- };
-
- return bmtd._erase(mtd, &instr);
-}
-
-static inline int bbt_nand_copy(u16 dest_blk, u16 src_blk, loff_t max_offset)
+int bbt_nand_copy(u16 dest_blk, u16 src_blk, loff_t max_offset)
{
int pages = bmtd.blk_size >> bmtd.pg_shift;
loff_t src = (loff_t)src_blk << bmtd.blk_shift;
@@ -155,13 +36,13 @@ static inline int bbt_nand_copy(u16 dest_blk, u16 src_blk, loff_t max_offset)
.mode = MTD_OPS_PLACE_OOB,
.oobbuf = oob,
.ooblen = min_t(int, bmtd.mtd->oobsize / pages, sizeof(oob)),
- .datbuf = nand_data_buf,
+ .datbuf = bmtd.data_buf,
.len = bmtd.pg_size,
};
struct mtd_oob_ops wr_ops = {
.mode = MTD_OPS_PLACE_OOB,
.oobbuf = oob,
- .datbuf = nand_data_buf,
+ .datbuf = bmtd.data_buf,
.len = bmtd.pg_size,
};
@@ -187,289 +68,7 @@ static inline int bbt_nand_copy(u16 dest_blk, u16 src_blk, loff_t max_offset)
}
/* -------- Bad Blocks Management -------- */
-static inline struct bbmt *bmt_tbl(struct bbbt *bbbt)
-{
- return (struct bbmt *)&bbbt->bb_tbl[bmtd.table_size];
-}
-
-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 = bmtd.ops->sig,
- .ooblen = bmtd.ops->sig_len,
- .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) {
- bmt_tbl(bbt)[i].block = block;
- bmt_tbl(bbt)[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;
- bmt_tbl(bbt)[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(bmt_tbl((struct bbbt *)nand_bbt_buf));
- 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 || bmt_tbl(bbt)[n].mapped == NORMAL_MAPPED) {
- pr_info("nand: FATAL ERR: no space to store BMT!\n");
- return (u16)-1;
- }
-
- block = bmt_tbl(bbt)[n].block;
- BBT_LOG("n = 0x%x, block = 0x%x", n, block);
- if (bbt_nand_erase(block)) {
- bmt_tbl(bbt)[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)) {
- bmt_tbl(bbt)[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 (bmt_tbl(bbt)[i].block != 0 && bmt_tbl(bbt)[i].mapped == NO_MAPPED) {
- bmt_tbl(bbt)[i].mapped = NORMAL_MAPPED;
- return bmt_tbl(bbt)[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 remap_block_v2(u16 block, u16 mapped_block, int copy_len)
-{
- 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;
-
- /* Erase new block */
- bbt_nand_erase(mapped_blk);
- if (copy_len > 0)
- bbt_nand_copy(mapped_blk, block, copy_len);
-
- bmtd.bmt_blk_idx = upload_bmt(bbt, bmtd.bmt_blk_idx);
-
- return true;
-}
-
-static bool
-mapping_block_in_range(int block, int *start, int *end)
+bool mapping_block_in_range(int block, int *start, int *end)
{
const __be32 *cur = bmtd.remap_range;
u32 addr = block << bmtd.blk_shift;
@@ -493,20 +92,6 @@ mapping_block_in_range(int block, int *start, int *end)
return false;
}
-static u16
-get_mapping_block_index_v2(int block)
-{
- int start, end;
-
- if (block >= bmtd.pool_lba)
- return block;
-
- if (!mapping_block_in_range(block, &start, &end))
- return block;
-
- return bmtd.bbt->bb_tbl[block];
-}
-
static int
mtk_bmt_read(struct mtd_info *mtd, loff_t from,
struct mtd_oob_ops *ops)
@@ -703,13 +288,6 @@ mtk_bmt_replace_ops(struct mtd_info *mtd)
mtd->_block_markbad = mtk_bmt_block_markbad;
}
-static void
-unmap_block_v2(u16 block)
-{
- 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);
@@ -727,99 +305,6 @@ static int mtk_bmt_debug_mark_bad(void *data, u64 val)
return 0;
}
-static unsigned long *
-mtk_bmt_get_mapping_mask(void)
-{
- struct bbmt *bbmt = bmt_tbl(bmtd.bbt);
- int main_blocks = bmtd.mtd->size >> bmtd.blk_shift;
- unsigned long *used;
- int i, k;
-
- used = kcalloc(sizeof(unsigned long), BIT_WORD(bmtd.bmt_blk_idx) + 1, GFP_KERNEL);
- if (!used)
- return NULL;
-
- for (i = 1; i < main_blocks; i++) {
- if (bmtd.bbt->bb_tbl[i] == i)
- continue;
-
- for (k = 0; k < bmtd.bmt_blk_idx; k++) {
- if (bmtd.bbt->bb_tbl[i] != bbmt[k].block)
- continue;
-
- set_bit(k, used);
- break;
- }
- }
-
- return used;
-}
-
-static int mtk_bmt_debug_v2(void *data, u64 val)
-{
- struct bbmt *bbmt = bmt_tbl(bmtd.bbt);
- struct mtd_info *mtd = bmtd.mtd;
- unsigned long *used;
- int main_blocks = mtd->size >> bmtd.blk_shift;
- int n_remap = 0;
- int i;
-
- used = mtk_bmt_get_mapping_mask();
- if (!used)
- return -ENOMEM;
-
- switch (val) {
- case 0:
- for (i = 1; i < main_blocks; i++) {
- if (bmtd.bbt->bb_tbl[i] == i)
- continue;
-
- printk("remap [%x->%x]\n", i, bmtd.bbt->bb_tbl[i]);
- n_remap++;
- }
- for (i = 0; i <= bmtd.bmt_blk_idx; i++) {
- char c;
-
- switch (bbmt[i].mapped) {
- case NO_MAPPED:
- continue;
- case NORMAL_MAPPED:
- c = 'm';
- if (test_bit(i, used))
- c = 'M';
- break;
- case BMT_MAPPED:
- c = 'B';
- break;
- default:
- c = 'X';
- break;
- }
- printk("[%x:%c] = 0x%x\n", i, c, bbmt[i].block);
- }
- break;
- case 100:
- for (i = 0; i <= bmtd.bmt_blk_idx; i++) {
- if (bbmt[i].mapped != NORMAL_MAPPED)
- continue;
-
- if (test_bit(i, used))
- continue;
-
- n_remap++;
- bbmt[i].mapped = NO_MAPPED;
- printk("free block [%d:%x]\n", i, bbmt[i].block);
- }
- if (n_remap)
- bmtd.bmt_blk_idx = upload_bmt(bmtd.bbt, bmtd.bmt_blk_idx);
- break;
- }
-
- kfree(used);
-
- return 0;
-}
-
static int mtk_bmt_debug(void *data, u64 val)
{
return bmtd.ops->debug(data, val);
@@ -853,8 +338,8 @@ void mtk_bmt_detach(struct mtd_info *mtd)
debugfs_remove_recursive(bmtd.debugfs_dir);
bmtd.debugfs_dir = NULL;
- kfree(nand_bbt_buf);
- kfree(nand_data_buf);
+ kfree(bmtd.bbt_buf);
+ kfree(bmtd.data_buf);
mtd->_read_oob = bmtd._read_oob;
mtd->_write_oob = bmtd._write_oob;
@@ -866,283 +351,9 @@ void mtk_bmt_detach(struct mtd_info *mtd)
memset(&bmtd, 0, sizeof(bmtd));
}
-static int mtk_bmt_init_v2(struct device_node *np)
-{
- u32 bmt_pool_size, bmt_table_size;
- u32 bufsz, block;
- u16 pmt_block;
-
- 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 = 0;
-
- if (of_property_read_u32(np, "mediatek,bmt-table-size",
- &bmt_table_size) != 0)
- bmt_table_size = 0x2000U;
-
- bmtd.table_size = bmt_table_size;
-
- pmt_block = bmtd.total_blks - bmt_pool_size - 2;
-
- bmtd.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.bb_max = bmtd.total_blks * BBPOOL_RATIO / 100;
-
- 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);
- if (!nand_bbt_buf)
- return -ENOMEM;
-
- memset(nand_bbt_buf, 0xff, bufsz);
-
- /* Scanning start from the first page of the last block
- * of whole flash
- */
- 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");
- return -1;
- }
-
- 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(bmtd.bbt))
- return -1;
-
- /* BMT always in the last valid block in pool */
- 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)
- return -1;
- }
-
- return 0;
-}
-
-static bool
-bbt_block_is_bad(u16 block)
-{
- u8 cur = nand_bbt_buf[block / 4];
-
- return cur & (3 << ((block % 4) * 2));
-}
-
-static void
-bbt_set_block_state(u16 block, bool bad)
-{
- u8 mask = (3 << ((block % 4) * 2));
-
- if (bad)
- nand_bbt_buf[block / 4] |= mask;
- else
- nand_bbt_buf[block / 4] &= ~mask;
-
- bbt_nand_erase(bmtd.bmt_blk_idx);
- write_bmt(bmtd.bmt_blk_idx, nand_bbt_buf);
-}
-
-static u16
-get_mapping_block_index_bbt(int block)
-{
- int start, end, ofs;
- int bad_blocks = 0;
- int i;
-
- if (!mapping_block_in_range(block, &start, &end))
- return block;
-
- start >>= bmtd.blk_shift;
- end >>= bmtd.blk_shift;
- /* skip bad blocks within the mapping range */
- ofs = block - start;
- for (i = start; i < end; i++) {
- if (bbt_block_is_bad(i))
- bad_blocks++;
- else if (ofs)
- ofs--;
- else
- break;
- }
-
- if (i < end)
- return i;
-
- /* when overflowing, remap remaining blocks to bad ones */
- for (i = end - 1; bad_blocks > 0; i--) {
- if (!bbt_block_is_bad(i))
- continue;
-
- bad_blocks--;
- if (bad_blocks <= ofs)
- return i;
- }
-
- return block;
-}
-
-static bool remap_block_bbt(u16 block, u16 mapped_blk, int copy_len)
-{
- int start, end;
- u16 new_blk;
-
- if (!mapping_block_in_range(block, &start, &end))
- return false;
-
- bbt_set_block_state(mapped_blk, true);
-
- new_blk = get_mapping_block_index_bbt(block);
- bbt_nand_erase(new_blk);
- if (copy_len > 0)
- bbt_nand_copy(new_blk, mapped_blk, copy_len);
-
- return false;
-}
-
-static void
-unmap_block_bbt(u16 block)
-{
- bbt_set_block_state(block, false);
-}
-
-static int
-mtk_bmt_read_bbt(void)
-{
- u8 oob_buf[8];
- int i;
-
- for (i = bmtd.total_blks - 1; i >= bmtd.total_blks - 5; i--) {
- u32 page = i << (bmtd.blk_shift - bmtd.pg_shift);
-
- if (bbt_nand_read(page, nand_bbt_buf, bmtd.pg_size,
- oob_buf, sizeof(oob_buf))) {
- pr_info("read_bbt: could not read block %d\n", i);
- continue;
- }
-
- if (oob_buf[0] != 0xff) {
- pr_info("read_bbt: bad block at %d\n", i);
- continue;
- }
-
- if (memcmp(&oob_buf[1], "mtknand", 7) != 0) {
- pr_info("read_bbt: signature mismatch in block %d\n", i);
- print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 16, 1, oob_buf, 8, 1);
- continue;
- }
-
- pr_info("read_bbt: found bbt at block %d\n", i);
- bmtd.bmt_blk_idx = i;
- return 0;
- }
-
- return -EIO;
-}
-
-
-static int
-mtk_bmt_init_bbt(struct device_node *np)
-{
- int buf_size = round_up(bmtd.total_blks >> 2, bmtd.blk_size);
- int ret;
-
- nand_bbt_buf = kmalloc(buf_size, GFP_KERNEL);
- if (!nand_bbt_buf)
- return -ENOMEM;
-
- memset(nand_bbt_buf, 0xff, buf_size);
- bmtd.mtd->size -= 4 * bmtd.mtd->erasesize;
-
- ret = mtk_bmt_read_bbt();
- if (ret)
- return ret;
-
- bmtd.bmt_pgs = buf_size / bmtd.pg_size;
-
- return 0;
-}
-
-static int mtk_bmt_debug_bbt(void *data, u64 val)
-{
- char buf[5];
- int i, k;
-
- switch (val) {
- case 0:
- for (i = 0; i < bmtd.total_blks; i += 4) {
- u8 cur = nand_bbt_buf[i / 4];
-
- for (k = 0; k < 4; k++, cur >>= 2)
- buf[k] = (cur & 3) ? 'B' : '.';
-
- buf[4] = 0;
- printk("[%06x] %s\n", i * bmtd.blk_size, buf);
- }
- break;
- case 100:
-#if 0
- for (i = bmtd.bmt_blk_idx; i < bmtd.total_blks - 1; i++)
- bbt_nand_erase(bmtd.bmt_blk_idx);
-#endif
-
- bmtd.bmt_blk_idx = bmtd.total_blks - 1;
- bbt_nand_erase(bmtd.bmt_blk_idx);
- write_bmt(bmtd.bmt_blk_idx, nand_bbt_buf);
- break;
- default:
- break;
- }
- 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,
- };
- static const struct mtk_bmt_ops bbt_ops = {
- .sig = "mtknand",
- .sig_len = 7,
- .init = mtk_bmt_init_bbt,
- .remap_block = remap_block_bbt,
- .unmap_block = unmap_block_bbt,
- .get_mapping_block = get_mapping_block_index_bbt,
- .debug = mtk_bmt_debug_bbt,
- };
struct device_node *np;
int ret = 0;
@@ -1154,9 +365,9 @@ int mtk_bmt_attach(struct mtd_info *mtd)
return 0;
if (of_property_read_bool(np, "mediatek,bmt-v2"))
- bmtd.ops = &v2_ops;
+ bmtd.ops = &mtk_bmt_v2_ops;
else if (of_property_read_bool(np, "mediatek,bbt"))
- bmtd.ops = &bbt_ops;
+ bmtd.ops = &mtk_bmt_bbt_ops;
else
return 0;
@@ -1173,14 +384,14 @@ int mtk_bmt_attach(struct mtd_info *mtd)
bmtd.pg_shift = ffs(bmtd.pg_size) - 1;
bmtd.total_blks = mtd->size >> bmtd.blk_shift;
- nand_data_buf = kzalloc(bmtd.pg_size, GFP_KERNEL);
- if (!nand_data_buf) {
+ bmtd.data_buf = kzalloc(bmtd.pg_size, GFP_KERNEL);
+ if (!bmtd.data_buf) {
pr_info("nand: FATAL ERR: allocate buffer failed!\n");
ret = -1;
goto error;
}
- memset(nand_data_buf, 0xff, bmtd.pg_size);
+ memset(bmtd.data_buf, 0xff, bmtd.pg_size);
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
new file mode 100644
index 0000000000..25bdb40d9b
--- /dev/null
+++ b/target/linux/generic/files/drivers/mtd/nand/mtk_bmt.h
@@ -0,0 +1,124 @@
+#ifndef __MTK_BMT_PRIV_H
+#define __MTK_BMT_PRIV_H
+
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/mtk_bmt.h>
+#include <linux/debugfs.h>
+
+#define MAIN_SIGNATURE_OFFSET 0
+#define OOB_SIGNATURE_OFFSET 1
+
+#define BBT_LOG(fmt, ...) pr_debug("[BBT][%s|%d] "fmt"\n", __func__, __LINE__, ##__VA_ARGS__)
+
+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 bmt_desc {
+ struct mtd_info *mtd;
+ unsigned char *bbt_buf;
+ unsigned char *data_buf;
+
+ 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);
+ int (*_erase) (struct mtd_info *mtd, struct erase_info *instr);
+ 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;
+
+ u32 table_size;
+ 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;
+
+ const __be32 *remap_range;
+ int remap_range_len;
+
+ /* to compensate for driver level remapping */
+ u8 oob_offset;
+};
+
+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;
+
+static inline u32 blk_pg(u16 block)
+{
+ return (u32)(block << (bmtd.blk_shift - bmtd.pg_shift));
+}
+
+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 mtd_info *mtd = bmtd.mtd;
+ struct erase_info instr = {
+ .addr = (loff_t)block << bmtd.blk_shift,
+ .len = bmtd.blk_size,
+ };
+
+ return bmtd._erase(mtd, &instr);
+}
+
+static inline 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 = bmtd.ops->sig,
+ .ooblen = bmtd.ops->sig_len,
+ .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);
+}
+
+int bbt_nand_copy(u16 dest_blk, u16 src_blk, loff_t max_offset);
+bool mapping_block_in_range(int block, int *start, int *end);
+
+#endif
diff --git a/target/linux/generic/files/drivers/mtd/nand/mtk_bmt_bbt.c b/target/linux/generic/files/drivers/mtd/nand/mtk_bmt_bbt.c
new file mode 100644
index 0000000000..fe1040802e
--- /dev/null
+++ b/target/linux/generic/files/drivers/mtd/nand/mtk_bmt_bbt.c
@@ -0,0 +1,203 @@
+/*
+ * Copyright (c) 2017 MediaTek Inc.
+ * Author: Xiangsheng Hou <xiangsheng.hou at mediatek.com>
+ * Copyright (c) 2020-2022 Felix Fietkau <nbd at nbd.name>
+ *
+ * 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 <linux/kernel.h>
+#include <linux/slab.h>
+#include "mtk_bmt.h"
+
+static bool
+bbt_block_is_bad(u16 block)
+{
+ u8 cur = bmtd.bbt_buf[block / 4];
+
+ return cur & (3 << ((block % 4) * 2));
+}
+
+static void
+bbt_set_block_state(u16 block, bool bad)
+{
+ u8 mask = (3 << ((block % 4) * 2));
+
+ if (bad)
+ bmtd.bbt_buf[block / 4] |= mask;
+ else
+ bmtd.bbt_buf[block / 4] &= ~mask;
+
+ bbt_nand_erase(bmtd.bmt_blk_idx);
+ write_bmt(bmtd.bmt_blk_idx, bmtd.bbt_buf);
+}
+
+static u16
+get_mapping_block_index_bbt(int block)
+{
+ int start, end, ofs;
+ int bad_blocks = 0;
+ int i;
+
+ if (!mapping_block_in_range(block, &start, &end))
+ return block;
+
+ start >>= bmtd.blk_shift;
+ end >>= bmtd.blk_shift;
+ /* skip bad blocks within the mapping range */
+ ofs = block - start;
+ for (i = start; i < end; i++) {
+ if (bbt_block_is_bad(i))
+ bad_blocks++;
+ else if (ofs)
+ ofs--;
+ else
+ break;
+ }
+
+ if (i < end)
+ return i;
+
+ /* when overflowing, remap remaining blocks to bad ones */
+ for (i = end - 1; bad_blocks > 0; i--) {
+ if (!bbt_block_is_bad(i))
+ continue;
+
+ bad_blocks--;
+ if (bad_blocks <= ofs)
+ return i;
+ }
+
+ return block;
+}
+
+static bool remap_block_bbt(u16 block, u16 mapped_blk, int copy_len)
+{
+ int start, end;
+ u16 new_blk;
+
+ if (!mapping_block_in_range(block, &start, &end))
+ return false;
+
+ bbt_set_block_state(mapped_blk, true);
+
+ new_blk = get_mapping_block_index_bbt(block);
+ bbt_nand_erase(new_blk);
+ if (copy_len > 0)
+ bbt_nand_copy(new_blk, mapped_blk, copy_len);
+
+ return false;
+}
+
+static void
+unmap_block_bbt(u16 block)
+{
+ bbt_set_block_state(block, false);
+}
+
+static int
+mtk_bmt_read_bbt(void)
+{
+ u8 oob_buf[8];
+ int i;
+
+ for (i = bmtd.total_blks - 1; i >= bmtd.total_blks - 5; i--) {
+ u32 page = i << (bmtd.blk_shift - bmtd.pg_shift);
+
+ if (bbt_nand_read(page, bmtd.bbt_buf, bmtd.pg_size,
+ oob_buf, sizeof(oob_buf))) {
+ pr_info("read_bbt: could not read block %d\n", i);
+ continue;
+ }
+
+ if (oob_buf[0] != 0xff) {
+ pr_info("read_bbt: bad block at %d\n", i);
+ continue;
+ }
+
+ if (memcmp(&oob_buf[1], "mtknand", 7) != 0) {
+ pr_info("read_bbt: signature mismatch in block %d\n", i);
+ print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 16, 1, oob_buf, 8, 1);
+ continue;
+ }
+
+ pr_info("read_bbt: found bbt at block %d\n", i);
+ bmtd.bmt_blk_idx = i;
+ return 0;
+ }
+
+ return -EIO;
+}
+
+
+static int
+mtk_bmt_init_bbt(struct device_node *np)
+{
+ int buf_size = round_up(bmtd.total_blks >> 2, bmtd.blk_size);
+ int ret;
+
+ bmtd.bbt_buf = kmalloc(buf_size, GFP_KERNEL);
+ if (!bmtd.bbt_buf)
+ return -ENOMEM;
+
+ memset(bmtd.bbt_buf, 0xff, buf_size);
+ bmtd.mtd->size -= 4 * bmtd.mtd->erasesize;
+
+ ret = mtk_bmt_read_bbt();
+ if (ret)
+ return ret;
+
+ bmtd.bmt_pgs = buf_size / bmtd.pg_size;
+
+ return 0;
+}
+
+static int mtk_bmt_debug_bbt(void *data, u64 val)
+{
+ char buf[5];
+ int i, k;
+
+ switch (val) {
+ case 0:
+ for (i = 0; i < bmtd.total_blks; i += 4) {
+ u8 cur = bmtd.bbt_buf[i / 4];
+
+ for (k = 0; k < 4; k++, cur >>= 2)
+ buf[k] = (cur & 3) ? 'B' : '.';
+
+ buf[4] = 0;
+ printk("[%06x] %s\n", i * bmtd.blk_size, buf);
+ }
+ break;
+ case 100:
+#if 0
+ for (i = bmtd.bmt_blk_idx; i < bmtd.total_blks - 1; i++)
+ bbt_nand_erase(bmtd.bmt_blk_idx);
+#endif
+
+ bmtd.bmt_blk_idx = bmtd.total_blks - 1;
+ bbt_nand_erase(bmtd.bmt_blk_idx);
+ write_bmt(bmtd.bmt_blk_idx, bmtd.bbt_buf);
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+const struct mtk_bmt_ops mtk_bmt_bbt_ops = {
+ .sig = "mtknand",
+ .sig_len = 7,
+ .init = mtk_bmt_init_bbt,
+ .remap_block = remap_block_bbt,
+ .unmap_block = unmap_block_bbt,
+ .get_mapping_block = get_mapping_block_index_bbt,
+ .debug = mtk_bmt_debug_bbt,
+};
diff --git a/target/linux/generic/files/drivers/mtd/nand/mtk_bmt_v2.c b/target/linux/generic/files/drivers/mtd/nand/mtk_bmt_v2.c
new file mode 100644
index 0000000000..b7ce7e2ca8
--- /dev/null
+++ b/target/linux/generic/files/drivers/mtd/nand/mtk_bmt_v2.c
@@ -0,0 +1,513 @@
+/*
+ * Copyright (c) 2017 MediaTek Inc.
+ * Author: Xiangsheng Hou <xiangsheng.hou at mediatek.com>
+ * Copyright (c) 2020-2022 Felix Fietkau <nbd at nbd.name>
+ *
+ * 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 <linux/kernel.h>
+#include <linux/slab.h>
+#include "mtk_bmt.h"
+
+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[];
+};
+
+struct bbmt {
+ u16 block;
+#define NO_MAPPED 0
+#define NORMAL_MAPPED 1
+#define BMT_MAPPED 2
+ u16 mapped;
+};
+
+/* Maximum 8k blocks */
+#define BBPOOL_RATIO 2
+#define BB_TABLE_MAX bmtd.table_size
+#define BMT_TABLE_MAX (BB_TABLE_MAX * BBPOOL_RATIO / 100)
+#define BMT_TBL_DEF_VAL 0x0
+
+static inline struct bbmt *bmt_tbl(struct bbbt *bbbt)
+{
+ return (struct bbmt *)&bbbt->bb_tbl[bmtd.table_size];
+}
+
+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), bmtd.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) {
+ bmt_tbl(bbt)[i].block = block;
+ bmt_tbl(bbt)[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;
+ bmt_tbl(bbt)[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 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 struct bbbt *scan_bmt(u16 block)
+{
+ u8 fdm[4];
+
+ if (block < bmtd.pool_lba)
+ return NULL;
+
+ if (read_bmt(block, bmtd.bbt_buf, fdm, sizeof(fdm)))
+ return scan_bmt(block - 1);
+
+ if (is_valid_bmt(bmtd.bbt_buf, fdm)) {
+ bmtd.bmt_blk_idx = get_bmt_index(bmt_tbl((struct bbbt *)bmtd.bbt_buf));
+ 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 *)bmtd.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 || bmt_tbl(bbt)[n].mapped == NORMAL_MAPPED) {
+ pr_info("nand: FATAL ERR: no space to store BMT!\n");
+ return (u16)-1;
+ }
+
+ block = bmt_tbl(bbt)[n].block;
+ BBT_LOG("n = 0x%x, block = 0x%x", n, block);
+ if (bbt_nand_erase(block)) {
+ bmt_tbl(bbt)[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)) {
+ bmt_tbl(bbt)[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 (bmt_tbl(bbt)[i].block != 0 && bmt_tbl(bbt)[i].mapped == NO_MAPPED) {
+ bmt_tbl(bbt)[i].mapped = NORMAL_MAPPED;
+ return bmt_tbl(bbt)[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 remap_block_v2(u16 block, u16 mapped_block, int copy_len)
+{
+ 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;
+
+ /* Erase new block */
+ bbt_nand_erase(mapped_blk);
+ if (copy_len > 0)
+ bbt_nand_copy(mapped_blk, block, copy_len);
+
+ bmtd.bmt_blk_idx = upload_bmt(bbt, bmtd.bmt_blk_idx);
+
+ return true;
+}
+
+static u16 get_mapping_block_index_v2(int block)
+{
+ int start, end;
+
+ if (block >= bmtd.pool_lba)
+ return block;
+
+ if (!mapping_block_in_range(block, &start, &end))
+ return block;
+
+ return bmtd.bbt->bb_tbl[block];
+}
+
+static void
+unmap_block_v2(u16 block)
+{
+ bmtd.bbt->bb_tbl[block] = block;
+ bmtd.bmt_blk_idx = upload_bmt(bmtd.bbt, bmtd.bmt_blk_idx);
+}
+
+static unsigned long *
+mtk_bmt_get_mapping_mask(void)
+{
+ struct bbmt *bbmt = bmt_tbl(bmtd.bbt);
+ int main_blocks = bmtd.mtd->size >> bmtd.blk_shift;
+ unsigned long *used;
+ int i, k;
+
+ used = kcalloc(sizeof(unsigned long), BIT_WORD(bmtd.bmt_blk_idx) + 1, GFP_KERNEL);
+ if (!used)
+ return NULL;
+
+ for (i = 1; i < main_blocks; i++) {
+ if (bmtd.bbt->bb_tbl[i] == i)
+ continue;
+
+ for (k = 0; k < bmtd.bmt_blk_idx; k++) {
+ if (bmtd.bbt->bb_tbl[i] != bbmt[k].block)
+ continue;
+
+ set_bit(k, used);
+ break;
+ }
+ }
+
+ return used;
+}
+
+static int mtk_bmt_debug_v2(void *data, u64 val)
+{
+ struct bbmt *bbmt = bmt_tbl(bmtd.bbt);
+ struct mtd_info *mtd = bmtd.mtd;
+ unsigned long *used;
+ int main_blocks = mtd->size >> bmtd.blk_shift;
+ int n_remap = 0;
+ int i;
+
+ used = mtk_bmt_get_mapping_mask();
+ if (!used)
+ return -ENOMEM;
+
+ switch (val) {
+ case 0:
+ for (i = 1; i < main_blocks; i++) {
+ if (bmtd.bbt->bb_tbl[i] == i)
+ continue;
+
+ printk("remap [%x->%x]\n", i, bmtd.bbt->bb_tbl[i]);
+ n_remap++;
+ }
+ for (i = 0; i <= bmtd.bmt_blk_idx; i++) {
+ char c;
+
+ switch (bbmt[i].mapped) {
+ case NO_MAPPED:
+ continue;
+ case NORMAL_MAPPED:
+ c = 'm';
+ if (test_bit(i, used))
+ c = 'M';
+ break;
+ case BMT_MAPPED:
+ c = 'B';
+ break;
+ default:
+ c = 'X';
+ break;
+ }
+ printk("[%x:%c] = 0x%x\n", i, c, bbmt[i].block);
+ }
+ break;
+ case 100:
+ for (i = 0; i <= bmtd.bmt_blk_idx; i++) {
+ if (bbmt[i].mapped != NORMAL_MAPPED)
+ continue;
+
+ if (test_bit(i, used))
+ continue;
+
+ n_remap++;
+ bbmt[i].mapped = NO_MAPPED;
+ printk("free block [%d:%x]\n", i, bbmt[i].block);
+ }
+ if (n_remap)
+ bmtd.bmt_blk_idx = upload_bmt(bmtd.bbt, bmtd.bmt_blk_idx);
+ break;
+ }
+
+ kfree(used);
+
+ return 0;
+}
+
+static int mtk_bmt_init_v2(struct device_node *np)
+{
+ u32 bmt_pool_size, bmt_table_size;
+ u32 bufsz, block;
+ u16 pmt_block;
+
+ 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 = 0;
+
+ if (of_property_read_u32(np, "mediatek,bmt-table-size",
+ &bmt_table_size) != 0)
+ bmt_table_size = 0x2000U;
+
+ bmtd.table_size = bmt_table_size;
+
+ pmt_block = bmtd.total_blks - bmt_pool_size - 2;
+
+ bmtd.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.bb_max = bmtd.total_blks * BBPOOL_RATIO / 100;
+
+ bufsz = round_up(sizeof(struct bbbt) +
+ bmt_table_size * sizeof(struct bbmt), bmtd.pg_size);
+ bmtd.bmt_pgs = bufsz >> bmtd.pg_shift;
+
+ bmtd.bbt_buf = kzalloc(bufsz, GFP_KERNEL);
+ if (!bmtd.bbt_buf)
+ return -ENOMEM;
+
+ memset(bmtd.bbt_buf, 0xff, bufsz);
+
+ /* Scanning start from the first page of the last block
+ * of whole flash
+ */
+ 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");
+ return -1;
+ }
+
+ bmtd.bbt = (struct bbbt *)bmtd.bbt_buf;
+ memset(bmt_tbl(bmtd.bbt), BMT_TBL_DEF_VAL,
+ bmtd.table_size * sizeof(struct bbmt));
+
+ if (scan_bad_blocks(bmtd.bbt))
+ return -1;
+
+ /* BMT always in the last valid block in pool */
+ 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)
+ return -1;
+ }
+
+ return 0;
+}
+
+
+const struct mtk_bmt_ops mtk_bmt_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,
+};
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 749dcb8356..50efb5a48a 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
++obj-$(CONFIG_MTD_NAND_MTK_BMT) += mtk_bmt.o mtk_bmt_v2.o mtk_bmt_bbt.o
obj-y += onenand/
obj-y += raw/
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