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dfu_mtd: Add provision to unlock mtd device

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Prior to writing to an mtd device, mtd_erase is called. This call
fails in case the sector being erased is locked. Call mtd_unlock to
unlock the region which is to be erased and later written to. Lock the
region once the write to the region has completed.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
This commit is contained in:
Sughosh Ganu 2020-12-30 19:27:06 +05:30 committed by Heinrich Schuchardt
parent 675b62e12f
commit 65f3fc18fc
1 changed files with 17 additions and 3 deletions
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20
drivers/dfu/dfu_mtd.c
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@ -21,7 +21,7 @@ static bool mtd_is_aligned_with_block_size(struct mtd_info *mtd, u64 size)
static int mtd_block_op(enum dfu_op op, struct dfu_entity *dfu,
u64 offset, void *buf, long *len)
{
u64 off, lim, remaining;
u64 off, lim, remaining, lock_ofs, lock_len;
struct mtd_info *mtd = dfu->data.mtd.info;
struct mtd_oob_ops io_op = {};
int ret = 0;
@ -34,7 +34,7 @@ static int mtd_block_op(enum dfu_op op, struct dfu_entity *dfu,
return 0;
}
off = dfu->data.mtd.start + offset + dfu->bad_skip;
off = lock_ofs = dfu->data.mtd.start + offset + dfu->bad_skip;
lim = dfu->data.mtd.start + dfu->data.mtd.size;
if (off >= lim) {
@ -56,12 +56,19 @@ static int mtd_block_op(enum dfu_op op, struct dfu_entity *dfu,
if (op == DFU_OP_WRITE) {
struct erase_info erase_op = {};
remaining = round_up(*len, mtd->erasesize);
remaining = lock_len = round_up(*len, mtd->erasesize);
erase_op.mtd = mtd;
erase_op.addr = off;
erase_op.len = mtd->erasesize;
erase_op.scrub = 0;
debug("Unlocking the mtd device\n");
ret = mtd_unlock(mtd, lock_ofs, lock_len);
if (ret && ret != -EOPNOTSUPP) {
printf("MTD device unlock failed\n");
return 0;
}
while (remaining) {
if (erase_op.addr + remaining > lim) {
printf("Limit reached 0x%llx while erasing at offset 0x%llx\n",
@ -139,6 +146,13 @@ static int mtd_block_op(enum dfu_op op, struct dfu_entity *dfu,
io_op.len = mtd->writesize;
}
if (op == DFU_OP_WRITE) {
/* Write done, lock again */
debug("Locking the mtd device\n");
ret = mtd_lock(mtd, lock_ofs, lock_len);
if (ret && ret != -EOPNOTSUPP)
printf("MTD device lock failed\n");
}
return ret;
}