linux-kernel - [PATCH 2/3] mtd: spi-nor: unlock global block protection on sst26vf064b

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Date:   Tue, 17 Jul 2018 19:28:30 +0300
From:   Tudor Ambarus <tudor.ambarus@...rochip.com>
To:     <marek.vasut@...il.com>, <dwmw2@...radead.org>,
        <computersforpeace@...il.com>, <boris.brezillon@...tlin.com>,
        <richard@....at>
CC:     <linux-mtd@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <anuragku@...inx.com>,
        <cyrille.pitchen@...rochip.com>, <nicolas.ferre@...rochip.com>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>
Subject: [PATCH 2/3] mtd: spi-nor: unlock global block protection on sst26vf064b

To avoid inadvertent writes during power-up, sst26vf064b is
write-protected by default after a power-on reset cycle.
Unlock the serial flash memory by using the Global Block Protection
Unlock command - it offers a single command cycle that unlocks
the entire memory array.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 6648251..eddf09f 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -1163,7 +1163,11 @@ static const struct flash_info spi_nor_ids[] = {
 	{ "sst25wf040b", INFO(0x621613, 0, 64 * 1024,  8, SECT_4K) },
 	{ "sst25wf040",  INFO(0xbf2504, 0, 64 * 1024,  8, SECT_4K | SST_WRITE) },
 	{ "sst25wf080",  INFO(0xbf2505, 0, 64 * 1024, 16, SECT_4K | SST_WRITE) },
-	{ "sst26vf064b", INFO(0xbf2643, 0, 64 * 1024, 128, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
+	{
+		"sst26vf064b", INFO(0xbf2643, 0, 64 * 1024, 128,
+			SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
+			UNLOCK_GLOBAL_BLOCK)
+	},
 
 	/* ST Microelectronics -- newer production may have feature updates */
 	{ "m25p05",  INFO(0x202010,  0,  32 * 1024,   2, 0) },
-- 
2.9.4