linux-kernel - [RFC/RFT PATCH v1 5/9] mtd: spi: Provide LUT entry to perform DUAL read

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Date:   Thu, 27 Sep 2018 00:07:35 +0200
From:   Lukasz Majewski <lukma@...x.de>
To:     Frieder Schrempf <frieder.schrempf@...eet.de>,
        boris.brezillon@...tlin.com, Mark Rutland <mark.rutland@....com>
Cc:     linux-mtd@...ts.infradead.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org, yogeshnarayan.gaur@....com,
        richard@....at, Stefan Agner <stefan@...er.ch>,
        Fabio Estevam <festevam@...il.com>,
        Fabio Estevam <fabio.estevam@....com>,
        prabhakar.kushwaha@....com, han.xu@....com, broonie@...nel.org,
        david.wolfe@....com, computersforpeace@...il.com,
        dwmw2@...radead.org, albert.aribaud@...ev.fr,
        Lukasz Majewski <lukma@...x.de>
Subject: [RFC/RFT PATCH v1 5/9] mtd: spi: Provide LUT entry to perform DUAL read

This commit adds LUT sequence to perform DUAL read (as opposite to the
default QUAD for this controller).

Signed-off-by: Lukasz Majewski <lukma@...x.de>
---
 drivers/mtd/spi-nor/fsl-quadspi.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index 4f0c78ba6fcb..0c381cdfb39f 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -207,6 +207,7 @@
 #define SEQID_RDCR		9
 #define SEQID_EN4B		10
 #define SEQID_BRWR		11
+#define SEQID_DUAL_READ	12
 
 #define QUADSPI_MIN_IOMAP SZ_4M
 
@@ -482,6 +483,15 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
 	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_BRWR),
 			base + QUADSPI_LUT(lut_base));
 
+	/* Dual Read */
+	lut_base = SEQID_DUAL_READ * 4;
+
+	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_READ_1_1_2) |
+		    LUT1(ADDR, PAD1, addrlen), base + QUADSPI_LUT(lut_base));
+	qspi_writel(q, LUT0(DUMMY, PAD1, read_dm) |
+		    LUT1(FSL_READ, PAD2, rxfifo),
+			base + QUADSPI_LUT(lut_base + 1));
+
 	fsl_qspi_lock_lut(q);
 }
 
@@ -513,6 +523,8 @@ static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
 		return SEQID_EN4B;
 	case SPINOR_OP_BRWR:
 		return SEQID_BRWR;
+	case SPINOR_OP_READ_1_1_2:
+		return SEQID_DUAL_READ;
 	default:
 		if (cmd == q->nor[0].erase_opcode)
 			return SEQID_SE;
-- 
2.11.0