diff options
| author | Michael Walle <michael@walle.cc> | 2021-03-03 21:18:19 +0100 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2021-03-28 19:24:54 +0200 |
| commit | e3c1f1c92d6ede3cfa09d6a103d3d1c1ef645e35 (patch) | |
| tree | 3349a378304c85ffac78c3c2de03c6824ba23c95 /drivers/mtd/mtdchar.c | |
| parent | mtd: require write permissions for locking and badblock ioctls (diff) | |
| download | linux-e3c1f1c92d6ede3cfa09d6a103d3d1c1ef645e35.tar.xz linux-e3c1f1c92d6ede3cfa09d6a103d3d1c1ef645e35.zip | |
mtd: add OTP (one-time-programmable) erase ioctl
This may sound like a contradiction but some SPI-NOR flashes really
support erasing their OTP region until it is finally locked. Having the
possibility to erase an OTP region might come in handy during
development.
The ioctl argument follows the OTPLOCK style.
Signed-off-by: Michael Walle <michael@walle.cc>
Acked-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210303201819.2752-1-michael@walle.cc
Diffstat (limited to 'drivers/mtd/mtdchar.c')
| -rw-r--r-- | drivers/mtd/mtdchar.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index 870f7a19ad9d..155e991d9d75 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -666,6 +666,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) case MEMWRITEOOB64: case MEMWRITE: case OTPLOCK: + case OTPERASE: if (!(file->f_mode & FMODE_WRITE)) return -EPERM; break; @@ -930,6 +931,7 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) } case OTPLOCK: + case OTPERASE: { struct otp_info oinfo; @@ -937,7 +939,10 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) return -EINVAL; if (copy_from_user(&oinfo, argp, sizeof(oinfo))) return -EFAULT; - ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length); + if (cmd == OTPLOCK) + ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length); + else + ret = mtd_erase_user_prot_reg(mtd, oinfo.start, oinfo.length); break; } |