linux-kernel - [PATCH v2 7/7] mtd: spi-nor: Rework the disabling of block write protection

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Date:   Sat, 24 Aug 2019 12:00:48 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <boris.brezillon@...labora.com>, <marek.vasut@...il.com>,
        <vigneshr@...com>, <miquel.raynal@...tlin.com>, <richard@....at>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
CC:     <Tudor.Ambarus@...rochip.com>
Subject: [PATCH v2 7/7] mtd: spi-nor: Rework the disabling of block write
 protection

From: Tudor Ambarus <tudor.ambarus@...rochip.com>

Get rid of MFR handling and implement specific manufacturer
default_init() fixup hooks.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index fc9e14777212..f4e9fcca619f 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -4146,6 +4146,16 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
 	return err;
 }
 
+static void atmel_set_default_init(struct spi_nor *nor)
+{
+	nor->params.disable_block_protection = spi_nor_clear_sr_bp;
+}
+
+static void intel_set_default_init(struct spi_nor *nor)
+{
+	nor->params.disable_block_protection = spi_nor_clear_sr_bp;
+}
+
 static void macronix_set_default_init(struct spi_nor *nor)
 {
 	nor->params.quad_enable = macronix_quad_enable;
@@ -4173,6 +4183,14 @@ static void spi_nor_manufacturer_init_params(struct spi_nor *nor)
 {
 	/* Init flash parameters based on MFR */
 	switch (JEDEC_MFR(nor->info)) {
+	case SNOR_MFR_ATMEL:
+		atmel_set_default_init(nor);
+		break;
+
+	case SNOR_MFR_INTEL:
+		intel_set_default_init(nor);
+		break;
+
 	case SNOR_MFR_MACRONIX:
 		macronix_set_default_init(nor);
 		break;
@@ -4760,18 +4778,10 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	if (info->flags & SPI_S3AN)
 		nor->flags |=  SNOR_F_READY_XSR_RDY;
 
-	if (info->flags & SPI_NOR_HAS_LOCK)
+	if (info->flags & SPI_NOR_HAS_LOCK) {
 		nor->flags |= SNOR_F_HAS_LOCK;
-
-	/*
-	 * Atmel, SST, Intel/Numonyx, and others serial NOR tend to power up
-	 * with the software protection bits set.
-	 */
-	if (JEDEC_MFR(nor->info) == SNOR_MFR_ATMEL ||
-	    JEDEC_MFR(nor->info) == SNOR_MFR_INTEL ||
-	    JEDEC_MFR(nor->info) == SNOR_MFR_SST ||
-	    nor->info->flags & SPI_NOR_HAS_LOCK)
 		nor->params.disable_block_protection = spi_nor_clear_sr_bp;
+	}
 
 	/* Init flash parameters based on flash_info struct and SFDP */
 	spi_nor_init_params(nor);
-- 
2.9.5