From: Sagar Shrikant Kadam <sagar.kadam@sifive.com>
To: marek.vasut@gmail.com, tudor.ambarus@microchip.com,
dwmw2@infradead.org, computersforpeace@gmail.com,
bbrezillon@kernel.org, richard@nod.at, palmer@sifive.com,
aou@eecs.berkeley.edu, paul.walmsley@sifive.com,
linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-riscv@lists.infradead.org
Cc: Sagar Shrikant Kadam <sagar.kadam@sifive.com>
Subject: [PATCH v4 0/3] add support for is25wp256 spi-nor device.
Date: Sat, 11 May 2019 15:38:05 +0530 [thread overview]
Message-ID: <1557569288-19441-1-git-send-email-sagar.kadam@sifive.com> (raw)
The patch set is tested on HiFive Unleashed board and is based on mainline
kernel v5.1. Its intended to add support for 32 MB spi-nor flash
mounted on the board. Memory Device supports 4/32/and 64 KB sectors size.
The device id table is updated accordingly.
Flash parameter table for ISSI device is set to use macronix_quad_enable
procedure to set the QE (quad-enable) bit of Status register.
A unilaterlay block unlocking scheme is added in patch 2.
These patches are based on original work done by Wesley Terpstra and/or Palmer Dabbelt:
https://github.com/riscv/riscv-linux/commit/c94e267766d62bc9a669611c3d0c8ed5ea26569b
Erase/Read/Write operations are verified on HiFive Unleashed board using mtd and flash utils (v1.5.2):
1. mtd_debug :Options available are : erase/read/write.
2. flashcp :Single utility that erases flash, writes a file to flash and verifies the data back.
3. flash_unlock: Unlock flash memory blocks.Arguments: are offset and number of blocks.
3. flash_lock: Lock flash memory blocks. Arguments: are offset and number of blocks.
Unlock scheme clears the protection bits of all blocks in the Status register.
Lock scheme:
A basic implementation based on stm_lock scheme and is validated for different number of blocks passed
to flash_lock. ISSI devices have Top/Bottom area selection in "function register" which is OTP memory.
Revision history:
V3<->V4:
-Extracted comman code and renamed few stm functions so that it can be reused for issi lock implementation.
-Added function's to read and write FR register, for selecting Top/Bottom area.
V2<->V3:
-Rebased patch to mainline v5.1 from earlier v5.1-rc5
-Updated commit messages, and cover letter with reference to git URL and author information.
-Deferred flash_lock mechanism and can go as separate patch.
V1<-> V2:
-Incorporated changes suggested by reviewers regarding patch/cover letter versioning, references of patch.
-Updated cover letter with description for flash operations verified with these changes.
-Add support for unlocking is25xxxxxx device
-Add support for locking is25xxxxxx device.
v1:
-Add support for is25wp256 device.
Sagar Shrikant Kadam (3):
mtd: spi-nor: add support for is25wp256
mtd: spi-nor: add support to unlock flash device.
mtd: spi-nor: add locking support for is25xxxxx device
drivers/mtd/spi-nor/spi-nor.c | 345 +++++++++++++++++++++++++++++++++++-------
include/linux/mtd/spi-nor.h | 7 +
2 files changed, 301 insertions(+), 51 deletions(-)
--
1.9.1
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next reply other threads:[~2019-05-11 10:08 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-11 10:08 Sagar Shrikant Kadam [this message]
2019-05-11 10:08 ` [PATCH v4 1/3] mtd: spi-nor: add support for is25wp256 Sagar Shrikant Kadam
2019-05-11 10:08 ` [PATCH v4 2/3] mtd: spi-nor: add support to unlock flash device Sagar Shrikant Kadam
2019-05-11 10:08 ` [PATCH v4 3/3] mtd: spi-nor: add locking support for is25xxxxx device Sagar Shrikant Kadam
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