linux-kernel - [PATCH 3/5] mtd: rawnand: qcom: Read QPIC version

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Date:   Sat, 10 Oct 2020 11:01:40 +0530
From:   Md Sadre Alam <mdalam@...eaurora.org>
To:     agross@...nel.org, bjorn.andersson@...aro.org,
        miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        robh+dt@...nel.org, linux-arm-msm@...r.kernel.org,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     mdalam@...eaurora.org, sricharan@...eaurora.org
Subject: [PATCH 3/5] mtd: rawnand: qcom: Read QPIC version

This change will add support to read QPIC version.
QPIC version V2.0 onwards some new register introduced
in QPIC. So based on hw_version we will update those
register.

Signed-off-by: Md Sadre Alam <mdalam@...eaurora.org>
---
 drivers/mtd/nand/raw/qcom_nandc.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index f5064ab..eabb803 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -443,6 +443,7 @@ struct qcom_nand_controller {
 
 	u32 cmd1, vld;
 	const struct qcom_nandc_props *props;
+	u32 hw_version;
 };
 
 /*
@@ -2538,6 +2539,7 @@ static int qcom_nand_attach_chip(struct nand_chip *chip)
 	int ecc_mode = 1;
 	int num_addr_cycle = 5, dsbl_sts_aftr_write = 0;
 	int wr_rd_bsy_gap = 2, recovery_cycle = 7;
+	u32 version_reg;
 
 	/* controller only supports 512 bytes data steps */
 	ecc->size = NANDC_STEP_SIZE;
@@ -2545,6 +2547,26 @@ static int qcom_nand_attach_chip(struct nand_chip *chip)
 	cwperpage = mtd->writesize / NANDC_STEP_SIZE;
 
 	/*
+	 * Read the required ecc strength from NAND device and overwrite the
+	 * device tree ecc strength
+	 */
+	if (chip->base.eccreq.strength >= 8)
+		ecc->strength = 8;
+
+	/* Read QPIC version register */
+	if (nandc->props->is_serial_nand)
+		version_reg = (NAND_VERSION + 0x4000);
+	else
+		version_reg = NAND_VERSION;
+	nandc->hw_version = nandc_read(nandc, version_reg);
+	pr_debug("QPIC controller hw version Major:%d, Minor:%d\n",
+		((nandc->hw_version & NAND_VERSION_MAJOR_MASK)
+		 >> NAND_VERSION_MAJOR_SHIFT),
+		((nandc->hw_version & NAND_VERSION_MINOR_MASK)
+		 >> NAND_VERSION_MINOR_SHIFT));
+	nandc->hw_version = ((nandc->hw_version & NAND_VERSION_MAJOR_MASK)
+			>> NAND_VERSION_MAJOR_SHIFT);
+	/*
 	 * Each CW has 4 available OOB bytes which will be protected with ECC
 	 * so remaining bytes can be used for ECC.
 	 */
-- 
2.7.4