linux-kernel - [PATCH v2 1/1] mtd: spi-nor: micron-st: Enable locking for n25q256ax1/mt25qu256a

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Message-ID: <20221019071631.15191-1-farbere@amazon.com>
Date:   Wed, 19 Oct 2022 07:16:31 +0000
From:   Eliav Farber <farbere@...zon.com>
To:     <tudor.ambarus@...rochip.com>, <pratyush@...nel.org>,
        <michael@...le.cc>, <miquel.raynal@...tlin.com>, <richard@....at>,
        <vigneshr@...com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <talel@...zon.com>, <jonnyc@...zon.com>, <hhhawa@...zon.com>,
        <hanochu@...zon.com>, <farbere@...zon.com>, <itamark@...zon.com>,
        <shellykz@...zon.com>, <amitlavi@...zon.com>, <dkl@...zon.com>
Subject: [PATCH v2 1/1] mtd: spi-nor: micron-st: Enable locking for n25q256ax1/mt25qu256a

n25q256ax1 [1] and mt25qu256a [2] (both have same jedec_id - 0x20bb19)
use the 4 bit Block Protection scheme and support Top/Bottom protection
via the BP and TB bits of the Status Register.
BP3 is located in bit 6 of the Status Register.
Tested on both n25q256ax1 and mt25qu256a.

[1] https://www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/n25q/n25q_256mb_3v.pdf
[2] https://www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/mt25q/die-rev-a/mt25q_qljs_u_256_aba_0.pdf

Signed-off-by: Eliav Farber <farbere@...zon.com>
---
xxd -p /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/sfdp 
53464450060101ff00060110300000ff84000102800000ffffffffffffff
ffffffffffffffffffffffffffffffffffffe520fbffffffff0f29eb276b
273b27bbffffffffffff27bbffff29eb0c2010d80f520000244a99008b8e
03d4ac0127387a757a75fbbdd55c4a0f82ff81bd3d36ffffffffffffffff
ffffffffffffffffffe7ffff21dcffff                            

md5sum /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/sfdp 
5ea738216f68c9f98987bb3725699a32  /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/sfdp

cat /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/jedec_id
20bb19104400

cat /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/partname 
mt25qu256a

cat /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/manufacturer 
st

v2 --> v1:
- Enable locking also for mt25qu256a.
- Dump the SFDP tables.

 drivers/mtd/spi-nor/micron-st.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mtd/spi-nor/micron-st.c b/drivers/mtd/spi-nor/micron-st.c
index 3c9681a3f7a3..f4d0153a5b1b 100644
--- a/drivers/mtd/spi-nor/micron-st.c
+++ b/drivers/mtd/spi-nor/micron-st.c
@@ -201,11 +201,15 @@ static const struct flash_info st_nor_parts[] = {
 		MFR_FLAGS(USE_FSR)
 	},
 	{ "mt25qu256a",  INFO6(0x20bb19, 0x104400, 64 * 1024,  512)
+		FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
+		      SPI_NOR_BP3_SR_BIT6)
 		NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)
 		FIXUP_FLAGS(SPI_NOR_4B_OPCODES)
 		MFR_FLAGS(USE_FSR)
 	},
 	{ "n25q256ax1",  INFO(0x20bb19, 0, 64 * 1024,  512)
+		FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_4BIT_BP |
+		      SPI_NOR_BP3_SR_BIT6)
 		NO_SFDP_FLAGS(SECT_4K | SPI_NOR_QUAD_READ)
 		MFR_FLAGS(USE_FSR)
 	},
-- 
2.37.1