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From:   Tudor Ambarus <tudor.ambarus@linaro.org>
To:     tkuw584924@gmail.com, takahiro.kuwano@infineon.com,
        michael@walle.cc
Cc:     pratyush@kernel.org, linux-mtd@lists.infradead.org,
        linux-kernel@vger.kernel.org, bacem.daassi@infineon.com,
        miquel.raynal@bootlin.com, richard@nod.at,
        Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
Subject: [PATCH v4 03/11] mtd: spi-nor: spansion: prepare octal dtr methods for multi chip support
Date:   Wed, 26 Jul 2023 10:52:49 +0300
Message-Id: <20230726075257.12985-4-tudor.ambarus@linaro.org>
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From: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>

Infineon's multi-chip package (MCP) devices require the octal DTR
configuration to be set for each die. Split common code in
dedicated methods to ease the octal DDR MCP support addition.

Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
---
 drivers/mtd/spi-nor/spansion.c | 50 +++++++++++++++++++++++++---------
 1 file changed, 37 insertions(+), 13 deletions(-)

diff --git a/drivers/mtd/spi-nor/spansion.c b/drivers/mtd/spi-nor/spansion.c
index 6460d2247bdf..51eabddf2b16 100644
--- a/drivers/mtd/spi-nor/spansion.c
+++ b/drivers/mtd/spi-nor/spansion.c
@@ -156,7 +156,7 @@ static int cypress_nor_sr_ready_and_clear(struct spi_nor *nor)
 	return 1;
 }
 
-static int cypress_nor_octal_dtr_en(struct spi_nor *nor)
+static int cypress_nor_set_memlat(struct spi_nor *nor, u64 addr)
 {
 	struct spi_mem_op op;
 	u8 *buf = nor->bouncebuf;
@@ -164,8 +164,7 @@ static int cypress_nor_octal_dtr_en(struct spi_nor *nor)
 	u8 addr_mode_nbytes = nor->params->addr_mode_nbytes;
 
 	op = (struct spi_mem_op)
-		CYPRESS_NOR_RD_ANY_REG_OP(addr_mode_nbytes,
-					  SPINOR_REG_CYPRESS_CFR2V, 0, buf);
+		CYPRESS_NOR_RD_ANY_REG_OP(addr_mode_nbytes, addr, 0, buf);
 
 	ret = spi_nor_read_any_reg(nor, &op, nor->reg_proto);
 	if (ret)
@@ -176,8 +175,7 @@ static int cypress_nor_octal_dtr_en(struct spi_nor *nor)
 	*buf |= FIELD_PREP(SPINOR_REG_CYPRESS_CFR2_MEMLAT_MASK,
 			   SPINOR_REG_CYPRESS_CFR2_MEMLAT_11_24);
 	op = (struct spi_mem_op)
-		CYPRESS_NOR_WR_ANY_REG_OP(addr_mode_nbytes,
-					  SPINOR_REG_CYPRESS_CFR2V, 1, buf);
+		CYPRESS_NOR_WR_ANY_REG_OP(addr_mode_nbytes, addr, 1, buf);
 
 	ret = spi_nor_write_any_volatile_reg(nor, &op, nor->reg_proto);
 	if (ret)
@@ -185,13 +183,33 @@ static int cypress_nor_octal_dtr_en(struct spi_nor *nor)
 
 	nor->read_dummy = 24;
 
+	return 0;
+}
+
+static int cypress_nor_set_octal_dtr_bits(struct spi_nor *nor, u64 addr)
+{
+	struct spi_mem_op op;
+	u8 *buf = nor->bouncebuf;
+
 	/* Set the octal and DTR enable bits. */
 	buf[0] = SPINOR_REG_CYPRESS_CFR5_OCT_DTR_EN;
 	op = (struct spi_mem_op)
-		CYPRESS_NOR_WR_ANY_REG_OP(addr_mode_nbytes,
-					  SPINOR_REG_CYPRESS_CFR5V, 1, buf);
+		CYPRESS_NOR_WR_ANY_REG_OP(nor->params->addr_mode_nbytes,
+					  addr, 1, buf);
 
-	ret = spi_nor_write_any_volatile_reg(nor, &op, nor->reg_proto);
+	return spi_nor_write_any_volatile_reg(nor, &op, nor->reg_proto);
+}
+
+static int cypress_nor_octal_dtr_en(struct spi_nor *nor)
+{
+	u8 *buf = nor->bouncebuf;
+	int ret;
+
+	ret = cypress_nor_set_memlat(nor, SPINOR_REG_CYPRESS_CFR2V);
+	if (ret)
+		return ret;
+
+	ret = cypress_nor_set_octal_dtr_bits(nor, SPINOR_REG_CYPRESS_CFR5V);
 	if (ret)
 		return ret;
 
@@ -209,11 +227,10 @@ static int cypress_nor_octal_dtr_en(struct spi_nor *nor)
 	return 0;
 }
 
-static int cypress_nor_octal_dtr_dis(struct spi_nor *nor)
+static int cypress_nor_set_single_spi_bits(struct spi_nor *nor, u64 addr)
 {
 	struct spi_mem_op op;
 	u8 *buf = nor->bouncebuf;
-	int ret;
 
 	/*
 	 * The register is 1-byte wide, but 1-byte transactions are not allowed
@@ -223,9 +240,16 @@ static int cypress_nor_octal_dtr_dis(struct spi_nor *nor)
 	buf[0] = SPINOR_REG_CYPRESS_CFR5_OCT_DTR_DS;
 	buf[1] = 0;
 	op = (struct spi_mem_op)
-		CYPRESS_NOR_WR_ANY_REG_OP(nor->addr_nbytes,
-					  SPINOR_REG_CYPRESS_CFR5V, 2, buf);
-	ret = spi_nor_write_any_volatile_reg(nor, &op, SNOR_PROTO_8_8_8_DTR);
+		CYPRESS_NOR_WR_ANY_REG_OP(nor->addr_nbytes, addr, 2, buf);
+	return spi_nor_write_any_volatile_reg(nor, &op, SNOR_PROTO_8_8_8_DTR);
+}
+
+static int cypress_nor_octal_dtr_dis(struct spi_nor *nor)
+{
+	u8 *buf = nor->bouncebuf;
+	int ret;
+
+	ret = cypress_nor_set_single_spi_bits(nor, SPINOR_REG_CYPRESS_CFR5V);
 	if (ret)
 		return ret;
 
-- 
2.34.1