summaryrefslogtreecommitdiffstats
path: root/drivers/mtd
diff options
context:
space:
mode:
authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2011-01-30 18:37:33 +0200
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2011-03-08 10:12:48 +0200
commit30b542ef453e6832ff682170b2db95d7bca2fe70 (patch)
treea74ccffb6a4eebb6ec8f9d3aa2d152700f995830 /drivers/mtd
parent10ac27970274e9094aee84a6452a25bf1b7e59e1 (diff)
downloadop-kernel-dev-30b542ef453e6832ff682170b2db95d7bca2fe70.zip
op-kernel-dev-30b542ef453e6832ff682170b2db95d7bca2fe70.tar.gz
UBI: incorporate maximum write size
Incorporate MTD write buffer size into UBI device information because UBIFS needs this field. UBI does not use it ATM, just provides to upper layers in 'struct ubi_device_info'. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/ubi/build.c14
-rw-r--r--drivers/mtd/ubi/kapi.c1
-rw-r--r--drivers/mtd/ubi/ubi.h3
3 files changed, 18 insertions, 0 deletions
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 5ebe280..f38e8de 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -690,11 +690,25 @@ static int io_init(struct ubi_device *ubi)
ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size);
ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0);
+ ubi->max_write_size = ubi->mtd->writebufsize;
+ /*
+ * Maximum write size has to be greater or equivalent to min. I/O
+ * size, and be multiple of min. I/O size.
+ */
+ if (ubi->max_write_size < ubi->min_io_size ||
+ ubi->max_write_size % ubi->min_io_size ||
+ !is_power_of_2(ubi->max_write_size)) {
+ ubi_err("bad write buffer size %d for %d min. I/O unit",
+ ubi->max_write_size, ubi->min_io_size);
+ return -EINVAL;
+ }
+
/* Calculate default aligned sizes of EC and VID headers */
ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size);
ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size);
dbg_msg("min_io_size %d", ubi->min_io_size);
+ dbg_msg("max_write_size %d", ubi->max_write_size);
dbg_msg("hdrs_min_io_size %d", ubi->hdrs_min_io_size);
dbg_msg("ec_hdr_alsize %d", ubi->ec_hdr_alsize);
dbg_msg("vid_hdr_alsize %d", ubi->vid_hdr_alsize);
diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index 69fa4ef0..701df4f 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -41,6 +41,7 @@ void ubi_do_get_device_info(struct ubi_device *ubi, struct ubi_device_info *di)
di->ubi_num = ubi->ubi_num;
di->leb_size = ubi->leb_size;
di->min_io_size = ubi->min_io_size;
+ di->max_write_size = ubi->max_write_size;
di->ro_mode = ubi->ro_mode;
di->cdev = ubi->cdev.dev;
}
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 0b0149c..b789943 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -381,6 +381,8 @@ struct ubi_wl_entry;
* @bad_allowed: whether the MTD device admits of bad physical eraseblocks or
* not
* @nor_flash: non-zero if working on top of NOR flash
+ * @max_write_size: maximum amount of bytes the underlying flash can write at a
+ * time (MTD write buffer size)
* @mtd: MTD device descriptor
*
* @peb_buf1: a buffer of PEB size used for different purposes
@@ -464,6 +466,7 @@ struct ubi_device {
int vid_hdr_shift;
unsigned int bad_allowed:1;
unsigned int nor_flash:1;
+ int max_write_size;
struct mtd_info *mtd;
void *peb_buf1;
OpenPOWER on IntegriCloud