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kernel: mtk_bmt: add support for limiting range of remapping

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This can be used to support ubi on top of mtk_bmt without reflashing the
boot loader. The boot loader + factory + kernel area is covered, while the
rest is passed through as-is

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2022-01-09 19:56:16 +01:00
parent 31b6cfb288
commit b86452f841
1 changed files with 29 additions and 7 deletions
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36
target/linux/generic/files/drivers/mtd/nand/mtk_bmt.c
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@ -90,6 +90,9 @@ static struct bmt_desc {
/* 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};
@ -458,17 +461,32 @@ static bool update_bmt(u16 block, int copy_len)
return true;
}
static bool
mapping_block_in_range(int block)
{
const __be32 *cur = bmtd.remap_range;
u32 addr = block << bmtd.blk_shift;
int i;
if (!cur || !bmtd.remap_range_len)
return true;
for (i = 0; i < bmtd.remap_range_len; i++, cur += 2)
if (addr >= be32_to_cpu(cur[0]) && addr < be32_to_cpu(cur[1]))
return true;
return false;
}
u16 get_mapping_block_index(int block)
{
int mapping_block;
if (block >= bmtd.pool_lba)
return 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);
if (!mapping_block_in_range(block))
return block;
return mapping_block;
return bmtd.bbt->bb_tbl[block];
}
static int
@ -839,6 +857,10 @@ 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);