linux-kernel - [PATCH V1 1/1] mtd: mtk-nor: set controller to 4B mode with large capacity flash

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Date:   Thu, 30 Mar 2017 16:23:42 +0800
From:   Guochun Mao <guochun.mao@...iatek.com>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>
CC:     David Woodhouse <dwmw2@...radead.org>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Russell King <linux@...linux.org.uk>,
        <linux-mtd@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Guochun Mao <guochun.mao@...iatek.com>
Subject: [PATCH V1 1/1] mtd: mtk-nor: set controller to 4B mode with large capacity flash

when nor's size larger than 16MByte, nor and controller should
enter 4Byte mode simultaneously.

Signed-off-by: Guochun Mao <guochun.mao@...iatek.com>
---
 drivers/mtd/spi-nor/mtk-quadspi.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/mtd/spi-nor/mtk-quadspi.c b/drivers/mtd/spi-nor/mtk-quadspi.c
index e661877..05cd8a8 100644
--- a/drivers/mtd/spi-nor/mtk-quadspi.c
+++ b/drivers/mtd/spi-nor/mtk-quadspi.c
@@ -369,6 +369,13 @@ static int mt8173_nor_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
 		/* We only handle 1 byte */
 		ret = mt8173_nor_wr_sr(mt8173_nor, *buf);
 		break;
+	case SPINOR_OP_EN4B:
+		/* Set nor controller to 4-byte address mode,
+		 * and simultaneously set nor flash.
+		 * This case should cooperate with default operation.
+		 */
+		writeb(readb(mt8173_nor->base + MTK_NOR_DUAL_REG) | 0x10,
+				mt8173_nor->base + MTK_NOR_DUAL_REG);
 	default:
 		ret = mt8173_nor_do_tx_rx(mt8173_nor, opcode, buf, len, NULL, 0);
 		if (ret)
-- 
1.7.9.5