[RFC PATCH v2 08/12] mtd: rawnand: ams-delta: Simplify pointer resolution on read/write

Janusz Krzysztofik
2018-08-06T22:30:12Z

Simplify data read/write sub-functions by changing their APIs so they
accept driver private structure pointer instead of mtd_info.

Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
---
drivers/mtd/nand/raw/ams-delta.c | 40 ++++++++++++++++++++++------------------
1 file changed, 22 insertions(+), 18 deletions(-)

diff --git a/drivers/mtd/nand/raw/ams-delta.c b/drivers/mtd/nand/raw/ams-delta.c
index d02c48c013e8..30c461138195 100644
--- a/drivers/mtd/nand/raw/ams-delta.c
+++ b/drivers/mtd/nand/raw/ams-delta.c
@@ -76,10 +76,8 @@ static void ams_delta_write_commit(struct ams_delta_nand *priv)
gpiod_set_value(priv->gpiod_nwe, 1);
}

-static void ams_delta_write_next_byte(struct mtd_info *mtd, u_char byte)
+static void ams_delta_write_next_byte(struct ams_delta_nand *priv, u_char byte)
{
- struct nand_chip *this = mtd_to_nand(mtd);
- struct ams_delta_nand *priv = nand_get_controller_data(this);
struct gpio_descs *data_gpiods = priv->data_gpiods;
unsigned long bits = byte;
int i, value_array[data_gpiods->ndescs];
@@ -93,10 +91,8 @@ static void ams_delta_write_next_byte(struct mtd_info *mtd, u_char byte)
ams_delta_write_commit(priv);
}

-static void ams_delta_write_byte(struct mtd_info *mtd, u_char byte)
+static void ams_delta_write_first_byte(struct ams_delta_nand *priv, u_char byte)
{
- struct nand_chip *this = mtd_to_nand(mtd);
- struct ams_delta_nand *priv = nand_get_controller_data(this);
struct gpio_descs *data_gpiods = priv->data_gpiods;
unsigned long bits = byte;
int i;
@@ -108,10 +104,8 @@ static void ams_delta_write_byte(struct mtd_info *mtd, u_char byte)
ams_delta_write_commit(priv);
}

-static u_char ams_delta_read_next_byte(struct mtd_info *mtd)
+static u_char ams_delta_read_next_byte(struct ams_delta_nand *priv)
{
- struct nand_chip *this = mtd_to_nand(mtd);
- struct ams_delta_nand *priv = nand_get_controller_data(this);
struct gpio_descs *data_gpiods = priv->data_gpiods;
unsigned long bits = 0;
int i, value_array[data_gpiods->ndescs];
@@ -131,38 +125,48 @@ static u_char ams_delta_read_next_byte(struct mtd_info *mtd)
return bits;
}

-static u_char ams_delta_read_byte(struct mtd_info *mtd)
+static u_char ams_delta_read_first_byte(struct ams_delta_nand *priv)
{
- struct nand_chip *this = mtd_to_nand(mtd);
- struct ams_delta_nand *priv = nand_get_controller_data(this);
struct gpio_descs *data_gpiods = priv->data_gpiods;
int i;

for (i = 0; i < data_gpiods->ndescs; i++)
gpiod_direction_input(data_gpiods->desc[i]);

- return ams_delta_read_next_byte(mtd);
+ return ams_delta_read_next_byte(priv);
+}
+
+static u_char ams_delta_read_byte(struct mtd_info *mtd)
+{
+ struct nand_chip *this = mtd_to_nand(mtd);
+ struct ams_delta_nand *priv = nand_get_controller_data(this);
+
+ return ams_delta_read_first_byte(priv);
}

static void ams_delta_write_buf(struct mtd_info *mtd, const u_char *buf,
int len)
{
+ struct nand_chip *this = mtd_to_nand(mtd);
+ struct ams_delta_nand *priv = nand_get_controller_data(this);
int i;

if (len > 0)
- ams_delta_write_byte(mtd, buf[0]);
+ ams_delta_write_first_byte(priv, buf[0]);
for (i = 1; i < len; i++)
- ams_delta_write_next_byte(mtd, buf[i]);
+ ams_delta_write_next_byte(priv, buf[i]);
}

static void ams_delta_read_buf(struct mtd_info *mtd, u_char *buf, int len)
{
+ struct nand_chip *this = mtd_to_nand(mtd);
+ struct ams_delta_nand *priv = nand_get_controller_data(this);
int i;

if (len > 0)
- buf[0] = ams_delta_read_byte(mtd);
+ buf[0] = ams_delta_read_first_byte(priv);
for (i = 1; i < len; i++)
- buf[i] = ams_delta_read_next_byte(mtd);
+ buf[i] = ams_delta_read_next_byte(priv);
}

/*
@@ -186,7 +190,7 @@ static void ams_delta_hwcontrol(struct mtd_info *mtd, int cmd,
}

if (cmd != NAND_CMD_NONE)
- ams_delta_write_byte(mtd, cmd);
+ ams_delta_write_first_byte(priv, cmd);
}

static int ams_delta_nand_ready(struct mtd_info *mtd)
--
2.16.4