From: Jungseung Lee <js07.lee@samsung.com>
To: Marek Vasut <marek.vasut@gmail.com>,
Tudor Ambarus <tudor.ambarus@microchip.com>,
David Woodhouse <dwmw2@infradead.org>,
Brian Norris <computersforpeace@gmail.com>,
Boris Brezillon <bbrezillon@kernel.org>,
Richard Weinberger <richard@nod.at>,
u.kleine-koenig@pengutronix.de, linux-mtd@lists.infradead.org,
js07.lee@gmail.com, js07.lee@samsung.com
Subject: [PATCH v3 2/4] mtd: spi-nor: introduce SR_BP_SHIFT define
Date: Sat, 13 Jul 2019 16:15:39 +0900 [thread overview]
Message-ID: <20190713071541.22090-2-js07.lee@samsung.com> (raw)
In-Reply-To: <20190713071541.22090-1-js07.lee@samsung.com>
The shift variable of SR_BP is conclusive because the first bit of SR_BP
is fixed on known flash.
Introduce SR_BP_SHIFT define, and let them used by stm_* functions
to replace ffs operation to get shift value.
Signed-off-by: Jungseung Lee <js07.lee@samsung.com>
---
drivers/mtd/spi-nor/spi-nor.c | 11 +++++------
include/linux/mtd/spi-nor.h | 2 ++
2 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 9ea03f4d943a..dd12d3c83029 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -1089,7 +1089,6 @@ static void stm_get_locked_range(struct spi_nor *nor, u8 sr, loff_t *ofs,
{
struct mtd_info *mtd = &nor->mtd;
u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
- int shift = ffs(mask) - 1;
int pow;
if (!(sr & mask)) {
@@ -1097,7 +1096,7 @@ static void stm_get_locked_range(struct spi_nor *nor, u8 sr, loff_t *ofs,
*ofs = 0;
*len = 0;
} else {
- pow = ((sr & mask) ^ mask) >> shift;
+ pow = ((sr & mask) ^ mask) >> SR_BP_SHIFT;
*len = mtd->size >> pow;
if (nor->flags & SNOR_F_HAS_SR_TB && sr & SR_TB_BIT5)
*ofs = 0;
@@ -1178,7 +1177,7 @@ static int stm_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
struct mtd_info *mtd = &nor->mtd;
int status_old, status_new;
u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
- u8 shift = ffs(mask) - 1, pow, val;
+ u8 pow, val;
loff_t lock_len;
bool can_be_top = true, can_be_bottom = nor->flags & SNOR_F_HAS_SR_TB;
bool use_top;
@@ -1222,7 +1221,7 @@ static int stm_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
* pow = ceil(log2(size / len)) = log2(size) - floor(log2(len))
*/
pow = ilog2(mtd->size) - ilog2(lock_len);
- val = mask - (pow << shift);
+ val = mask - (pow << SR_BP_SHIFT);
if (val & ~mask)
return -EINVAL;
/* Don't "lock" with no region! */
@@ -1258,7 +1257,7 @@ static int stm_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
struct mtd_info *mtd = &nor->mtd;
int status_old, status_new;
u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
- u8 shift = ffs(mask) - 1, pow, val;
+ u8 pow, val;
loff_t lock_len;
bool can_be_top = true, can_be_bottom = nor->flags & SNOR_F_HAS_SR_TB;
bool use_top;
@@ -1305,7 +1304,7 @@ static int stm_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
if (lock_len == 0) {
val = 0; /* fully unlocked */
} else {
- val = mask - (pow << shift);
+ val = mask - (pow << SR_BP_SHIFT);
/* Some power-of-two sizes are not supported */
if (val & ~mask)
return -EINVAL;
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index f8bbc98432ff..b8f4439c30b1 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -132,6 +132,8 @@
/* Used for Winbond and GigaDevice flashes */
#define SR_TB_BIT6 BIT(6) /* Top/Bottom protect */
+#define SR_BP_SHIFT 2
+
/* Spansion/Cypress specific status bits */
#define SR_E_ERR BIT(5)
#define SR_P_ERR BIT(6)
--
2.17.1
______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/
next prev parent reply other threads:[~2019-08-01 2:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20190801020509epcas1p155f87090273be705f1a9ae752c0bca5c@epcas1p1.samsung.com>
2019-07-13 7:15 ` [PATCH v3 1/4] mtd: spi-nor: rename SR_TB to indicate the using bit Jungseung Lee
[not found] ` <CGME20190801020516epcas1p383452adf9755f7121812aac0f335a779@epcas1p3.samsung.com>
2019-07-13 7:15 ` Jungseung Lee [this message]
[not found] ` <CGME20190801020520epcas1p3a9d8fc8175a5cc74be9077c2c6ee678c@epcas1p3.samsung.com>
2019-07-13 7:15 ` [PATCH v3 3/4] mtd: spi-nor: add 4bit block protection support Jungseung Lee
[not found] ` <CGME20190801020523epcas1p27580bead294a67fccea6fe8615e73da9@epcas1p2.samsung.com>
2019-07-13 7:15 ` [PATCH v3 4/4] mtd: spi-nor: support lock/unlock for a few Micron chips Jungseung Lee
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190713071541.22090-2-js07.lee@samsung.com \
--to=js07.lee@samsung.com \
--cc=bbrezillon@kernel.org \
--cc=computersforpeace@gmail.com \
--cc=dwmw2@infradead.org \
--cc=js07.lee@gmail.com \
--cc=linux-mtd@lists.infradead.org \
--cc=marek.vasut@gmail.com \
--cc=richard@nod.at \
--cc=tudor.ambarus@microchip.com \
--cc=u.kleine-koenig@pengutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).