linux-kernel - [PATCH v2 4/4] mtd: spi-nor: fsl-quadspi: extend support for some special requerment.

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Message-ID: <1450954821-7483-4-git-send-email-yao.yuan@freescale.com>
Date:	Thu, 24 Dec 2015 19:00:21 +0800
From:	Yuan Yao <yao.yuan@...escale.com>
To:	<dwmw2@...radead.org>, <computersforpeace@...il.com>,
	<han.xu@...escale.com>
CC:	<linux-kernel@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
	<yao.yuan@....com>
Subject: [PATCH v2 4/4] mtd: spi-nor: fsl-quadspi: extend support for some special requerment.

Add extra info in LUT table to support some special requerments.
Spansion S25FS-S family flash need some special operations.

Signed-off-by: Yuan Yao <yao.yuan@....com>
---
Changed in v2:
Update my email to <yao.yuan@....com>
---
 drivers/mtd/spi-nor/fsl-quadspi.c | 41 +++++++++++++++++++++++++++++++++++++--
 include/linux/mtd/spi-nor.h       |  4 ++++
 2 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index 9ab2b51..081ae85 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -205,6 +205,8 @@
 #define SEQID_RDCR		9
 #define SEQID_EN4B		10
 #define SEQID_BRWR		11
+#define SEQID_RDAR		12
+#define SEQID_WRAR		13
 
 #define QUADSPI_MIN_IOMAP SZ_4M
 
@@ -476,6 +478,28 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
 	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_BRWR),
 			base + QUADSPI_LUT(lut_base));
 
+	/*
+	 * Read any device register.
+	 * Used for Spansion S25FS-S family flash only.
+	 */
+	lut_base = SEQID_RDAR * 4;
+	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_SPANSION_RDAR) |
+			LUT1(ADDR, PAD1, ADDR24BIT),
+			base + QUADSPI_LUT(lut_base));
+	qspi_writel(q, LUT0(DUMMY, PAD1, 8) | LUT1(FSL_READ, PAD1, 1),
+			base + QUADSPI_LUT(lut_base + 1));
+
+	/*
+	 * Write any device register.
+	 * Used for Spansion S25FS-S family flash only.
+	 */
+	lut_base = SEQID_WRAR * 4;
+	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_SPANSION_WRAR) |
+			LUT1(ADDR, PAD1, ADDR24BIT),
+			base + QUADSPI_LUT(lut_base));
+	qspi_writel(q, LUT0(FSL_WRITE, PAD1, 1),
+			base + QUADSPI_LUT(lut_base + 1));
+
 	fsl_qspi_lock_lut(q);
 }
 
@@ -484,7 +508,12 @@ static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
 {
 	switch (cmd) {
 	case SPINOR_OP_READ_1_1_4:
+	case SPINOR_OP_READ4_1_1_4:
 		return SEQID_QUAD_READ;
+	case SPINOR_OP_SPANSION_RDAR:
+		return SEQID_RDAR;
+	case SPINOR_OP_SPANSION_WRAR:
+		return SEQID_WRAR;
 	case SPINOR_OP_WREN:
 		return SEQID_WREN;
 	case SPINOR_OP_WRDI:
@@ -835,8 +864,12 @@ static int fsl_qspi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
 {
 	int ret;
 	struct fsl_qspi *q = nor->priv;
+	u32 to = 0;
+
+	if (opcode == SPINOR_OP_SPANSION_RDAR)
+		memcpy(&to, nor->cmd_buf, 4);
 
-	ret = fsl_qspi_runcmd(q, opcode, 0, len);
+	ret = fsl_qspi_runcmd(q, opcode, to, len);
 	if (ret)
 		return ret;
 
@@ -848,9 +881,13 @@ static int fsl_qspi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
 {
 	struct fsl_qspi *q = nor->priv;
 	int ret;
+	u32 to = 0;
+
+	if (opcode == SPINOR_OP_SPANSION_RDAR)
+		memcpy(&to, nor->cmd_buf, 4);
 
 	if (!buf) {
-		ret = fsl_qspi_runcmd(q, opcode, 0, 1);
+		ret = fsl_qspi_runcmd(q, opcode, to, 1);
 		if (ret)
 			return ret;
 
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index fac3f6f..7a2f193 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -74,6 +74,10 @@
 /* Used for Spansion flashes only. */
 #define SPINOR_OP_BRWR		0x17	/* Bank register write */
 
+/* Used for Spansion S25FS-S family flash only. */
+#define SPINOR_OP_SPANSION_RDAR	0x65	/* Read any device register */
+#define SPINOR_OP_SPANSION_WRAR	0x71	/* Write any device register */
+
 /* Used for Micron flashes only. */
 #define SPINOR_OP_RD_EVCR      0x65    /* Read EVCR register */
 #define SPINOR_OP_WD_EVCR      0x61    /* Write EVCR register */
-- 
2.1.0.27.g96db324

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