linux-kernel - [PATCH 8/8] mtd: spinand: micron: Enable micron flashes with multi-die

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Message-Id: <20190722055621.23526-9-sshivamurthy@micron.com>
Date:   Mon, 22 Jul 2019 07:56:21 +0200
From:   shiva.linuxworks@...il.com
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        Shivamurthy Shastri <sshivamurthy@...ron.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jeff Kletsky <git-commits@...ycomm.com>,
        Chuanhong Guo <gch981213@...il.com>,
        liaoweixiong <liaoweixiong@...winnertech.com>
Subject: [PATCH 8/8] mtd: spinand: micron: Enable micron flashes with multi-die

From: Shivamurthy Shastri <sshivamurthy@...ron.com>

Some of the Micron flashes has multi-die, and need to select the die
each time while accessing it.

Signed-off-by: Shivamurthy Shastri <sshivamurthy@...ron.com>
---
 drivers/mtd/nand/spi/micron.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/mtd/nand/spi/micron.c b/drivers/mtd/nand/spi/micron.c
index 1e28ea3d1362..fa2b43caf39d 100644
--- a/drivers/mtd/nand/spi/micron.c
+++ b/drivers/mtd/nand/spi/micron.c
@@ -90,6 +90,19 @@ static int micron_ecc_get_status(struct spinand_device *spinand,
 	return -EINVAL;
 }
 
+static int micron_select_target(struct spinand_device *spinand,
+				unsigned int target)
+{
+	struct spi_mem_op op = SPINAND_SET_FEATURE_OP(0xd0,
+						      spinand->scratchbuf);
+
+	if (target == 1)
+		target = 0x40;
+
+	*spinand->scratchbuf = target;
+	return spi_mem_exec_op(spinand->spimem, &op);
+}
+
 static int micron_spinand_detect(struct spinand_device *spinand)
 {
 	const struct spi_mem_op *op;
@@ -105,6 +118,7 @@ static int micron_spinand_detect(struct spinand_device *spinand)
 	spinand->flags = 0;
 	spinand->eccinfo.get_status = micron_ecc_get_status;
 	spinand->eccinfo.ooblayout = &micron_ooblayout_ops;
+	spinand->select_target = micron_select_target;
 
 	op = spinand_select_op_variant(spinand,
 				       &read_cache_variants);
-- 
2.17.1