linux-kernel - [PATCH 3/3] mtd: devices: m25p80: Share code between m25p80_read() and m25p80

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Date:   Sun, 31 Mar 2019 21:49:38 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     linux-mtd@...ts.infradead.org
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Chris Healy <cphealy@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] mtd: devices: m25p80: Share code between m25p80_read() and m25p80_write()

Move shared parts of m25p80_read() and m25p80_write() into a separate
subroutine and convert the rest of the code to use it. No functional
change intended.

Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
Cc: Brian Norris <computersforpeace@...il.com>
Cc: Boris Brezillon <boris.brezillon@...tlin.com>
Cc: Marek Vasut <marek.vasut@...il.com>
Cc: Chris Healy <cphealy@...il.com>
Cc: linux-mtd@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/mtd/devices/m25p80.c | 58 ++++++++++++++++--------------------
 1 file changed, 25 insertions(+), 33 deletions(-)

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index a54cad9bb6e3..199f7c210799 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -81,34 +81,41 @@ static int m25p80_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
 	return ret;
 }
 
-static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
-			    const u_char *buf)
+static ssize_t m25p80_read_write(struct spi_nor *nor, struct spi_mem_op *op,
+				 enum spi_nor_protocol proto)
 {
 	struct m25p *flash = nor->priv;
-	struct spi_mem_op op =
-			SPI_MEM_OP(SPI_MEM_OP_CMD(nor->program_opcode, 1),
-				   SPI_MEM_OP_ADDR(nor->addr_width, to, 1),
-				   SPI_MEM_OP_NO_DUMMY,
-				   SPI_MEM_OP_DATA_OUT(len, buf, 1));
 	int ret;
 
 	/* get transfer protocols. */
-	op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->write_proto);
-	op.addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->write_proto);
-	op.data.buswidth = spi_nor_get_protocol_data_nbits(nor->write_proto);
-
-	if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second)
-		op.addr.nbytes = 0;
+	op->cmd.buswidth = spi_nor_get_protocol_inst_nbits(proto);
+	op->addr.buswidth = spi_nor_get_protocol_addr_nbits(proto);
+	op->data.buswidth = spi_nor_get_protocol_data_nbits(proto);
 
-	ret = spi_mem_adjust_op_size(flash->spimem, &op);
+	ret = spi_mem_adjust_op_size(flash->spimem, op);
 	if (ret)
 		return ret;
 
-	ret = spi_mem_exec_op(flash->spimem, &op);
+	ret = spi_mem_exec_op(flash->spimem, op);
 	if (ret)
 		return ret;
 
-	return op.data.nbytes;
+	return op->data.nbytes;
+}
+
+static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
+			    const u_char *buf)
+{
+	struct spi_mem_op op =
+			SPI_MEM_OP(SPI_MEM_OP_CMD(nor->program_opcode, 1),
+				   SPI_MEM_OP_ADDR(nor->addr_width, to, 1),
+				   SPI_MEM_OP_NO_DUMMY,
+				   SPI_MEM_OP_DATA_OUT(len, buf, 1));
+
+	if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second)
+		op.addr.nbytes = 0;
+
+	return m25p80_read_write(nor, &op, nor->write_proto);
 }
 
 /*
@@ -118,32 +125,17 @@ static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
 static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
 			   u_char *buf)
 {
-	struct m25p *flash = nor->priv;
 	struct spi_mem_op op =
 			SPI_MEM_OP(SPI_MEM_OP_CMD(nor->read_opcode, 1),
 				   SPI_MEM_OP_ADDR(nor->addr_width, from, 1),
 				   SPI_MEM_OP_DUMMY(nor->read_dummy, 1),
 				   SPI_MEM_OP_DATA_IN(len, buf, 1));
-	int ret;
-
-	/* get transfer protocols. */
-	op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->read_proto);
-	op.addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->read_proto);
-	op.dummy.buswidth = op.addr.buswidth;
-	op.data.buswidth = spi_nor_get_protocol_data_nbits(nor->read_proto);
 
+	op.dummy.buswidth = spi_nor_get_protocol_addr_nbits(nor->read_proto);
 	/* convert the dummy cycles to the number of bytes */
 	op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;
 
-	ret = spi_mem_adjust_op_size(flash->spimem, &op);
-	if (ret)
-		return ret;
-
-	ret = spi_mem_exec_op(flash->spimem, &op);
-	if (ret)
-		return ret;
-
-	return op.data.nbytes;
+	return m25p80_read_write(nor, &op, nor->read_proto);
 }
 
 /*
-- 
2.20.1