[PATCH v7 01/10] mtd: spi-nor: change return value of read/write
Brian Norris
computersforpeace at gmail.com
Thu May 5 17:31:47 PDT 2016
From: Michal Suchanek <hramrach at gmail.com>
Change the return value of spi-nor device read and write methods to
allow returning amount of data transferred and errors as
read(2)/write(2) does.
Also, start handling positive returns in spi_nor_read(), since we want
to convert drivers to start returning the read-length both via *retlen
and the return code. (We don't need to do the same transition process
for spi_nor_write(), since ->write() didn't used to have a return code
at all.)
Signed-off-by: Michal Suchanek <hramrach at gmail.com>
Signed-off-by: Brian Norris <computersforpeace at gmail.com>
---
v6 -> v7:
* added handling of positive return codes to spi_nor_read() to help preserve
bisectability
drivers/mtd/devices/m25p80.c | 5 +++--
drivers/mtd/spi-nor/fsl-quadspi.c | 5 +++--
drivers/mtd/spi-nor/mtk-quadspi.c | 26 ++++++++++++++++++--------
drivers/mtd/spi-nor/nxp-spifi.c | 12 ++++++------
drivers/mtd/spi-nor/spi-nor.c | 5 ++++-
include/linux/mtd/spi-nor.h | 4 ++--
6 files changed, 36 insertions(+), 21 deletions(-)
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 9d6854467651..3bd75e87ed89 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -73,7 +73,7 @@ static int m25p80_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
return spi_write(spi, flash->command, len + 1);
}
-static void m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
+static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
struct m25p *flash = nor->priv;
@@ -101,6 +101,7 @@ static void m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
spi_sync(spi, &m);
*retlen += m.actual_length - cmd_sz;
+ return 0;
}
static inline unsigned int m25p80_rx_nbits(struct spi_nor *nor)
@@ -119,7 +120,7 @@ static inline unsigned int m25p80_rx_nbits(struct spi_nor *nor)
* Read an address range from the nor chip. The address range
* may be any size provided it is within the physical boundaries.
*/
-static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
+static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct m25p *flash = nor->priv;
diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
index 9ab2b51d54b8..74dc155e1b3b 100644
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -868,7 +868,7 @@ static int fsl_qspi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
return ret;
}
-static void fsl_qspi_write(struct spi_nor *nor, loff_t to,
+static ssize_t fsl_qspi_write(struct spi_nor *nor, loff_t to,
size_t len, size_t *retlen, const u_char *buf)
{
struct fsl_qspi *q = nor->priv;
@@ -878,9 +878,10 @@ static void fsl_qspi_write(struct spi_nor *nor, loff_t to,
/* invalid the data in the AHB buffer. */
fsl_qspi_invalid(q);
+ return 0;
}
-static int fsl_qspi_read(struct spi_nor *nor, loff_t from,
+static ssize_t fsl_qspi_read(struct spi_nor *nor, loff_t from,
size_t len, size_t *retlen, u_char *buf)
{
struct fsl_qspi *q = nor->priv;
diff --git a/drivers/mtd/spi-nor/mtk-quadspi.c b/drivers/mtd/spi-nor/mtk-quadspi.c
index 8bed1a4cb79c..ab92ac0f6b2b 100644
--- a/drivers/mtd/spi-nor/mtk-quadspi.c
+++ b/drivers/mtd/spi-nor/mtk-quadspi.c
@@ -243,8 +243,8 @@ static void mt8173_nor_set_addr(struct mt8173_nor *mt8173_nor, u32 addr)
writeb(addr & 0xff, mt8173_nor->base + MTK_NOR_RADR3_REG);
}
-static int mt8173_nor_read(struct spi_nor *nor, loff_t from, size_t length,
- size_t *retlen, u_char *buffer)
+static ssize_t mt8173_nor_read(struct spi_nor *nor, loff_t from, size_t length,
+ size_t *retlen, u_char *buffer)
{
int i, ret;
int addr = (int)from;
@@ -297,36 +297,46 @@ static int mt8173_nor_write_buffer(struct mt8173_nor *mt8173_nor, int addr,
return mt8173_nor_execute_cmd(mt8173_nor, MTK_NOR_WR_CMD);
}
-static void mt8173_nor_write(struct spi_nor *nor, loff_t to, size_t len,
- size_t *retlen, const u_char *buf)
+static ssize_t mt8173_nor_write(struct spi_nor *nor, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
{
int ret;
struct mt8173_nor *mt8173_nor = nor->priv;
ret = mt8173_nor_write_buffer_enable(mt8173_nor);
- if (ret < 0)
+ if (ret < 0) {
dev_warn(mt8173_nor->dev, "write buffer enable failed!\n");
+ return ret;
+ }
while (len >= SFLASH_WRBUF_SIZE) {
ret = mt8173_nor_write_buffer(mt8173_nor, to, buf);
- if (ret < 0)
+ if (ret < 0) {
dev_err(mt8173_nor->dev, "write buffer failed!\n");
+ return ret;
+ }
len -= SFLASH_WRBUF_SIZE;
to += SFLASH_WRBUF_SIZE;
buf += SFLASH_WRBUF_SIZE;
(*retlen) += SFLASH_WRBUF_SIZE;
}
ret = mt8173_nor_write_buffer_disable(mt8173_nor);
- if (ret < 0)
+ if (ret < 0) {
dev_warn(mt8173_nor->dev, "write buffer disable failed!\n");
+ return ret;
+ }
if (len) {
ret = mt8173_nor_write_single_byte(mt8173_nor, to, (int)len,
(u8 *)buf);
- if (ret < 0)
+ if (ret < 0) {
dev_err(mt8173_nor->dev, "write single byte failed!\n");
+ return ret;
+ }
(*retlen) += len;
}
+
+ return 0;
}
static int mt8173_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
diff --git a/drivers/mtd/spi-nor/nxp-spifi.c b/drivers/mtd/spi-nor/nxp-spifi.c
index ae428cb0e04b..187adba5e69f 100644
--- a/drivers/mtd/spi-nor/nxp-spifi.c
+++ b/drivers/mtd/spi-nor/nxp-spifi.c
@@ -172,8 +172,8 @@ static int nxp_spifi_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
return nxp_spifi_wait_for_cmd(spifi);
}
-static int nxp_spifi_read(struct spi_nor *nor, loff_t from, size_t len,
- size_t *retlen, u_char *buf)
+static ssize_t nxp_spifi_read(struct spi_nor *nor, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
{
struct nxp_spifi *spifi = nor->priv;
int ret;
@@ -188,8 +188,8 @@ static int nxp_spifi_read(struct spi_nor *nor, loff_t from, size_t len,
return 0;
}
-static void nxp_spifi_write(struct spi_nor *nor, loff_t to, size_t len,
- size_t *retlen, const u_char *buf)
+static ssize_t nxp_spifi_write(struct spi_nor *nor, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
{
struct nxp_spifi *spifi = nor->priv;
u32 cmd;
@@ -197,7 +197,7 @@ static void nxp_spifi_write(struct spi_nor *nor, loff_t to, size_t len,
ret = nxp_spifi_set_memory_mode_off(spifi);
if (ret)
- return;
+ return ret;
writel(to, spifi->io_base + SPIFI_ADDR);
*retlen += len;
@@ -212,7 +212,7 @@ static void nxp_spifi_write(struct spi_nor *nor, loff_t to, size_t len,
while (len--)
writeb(*buf++, spifi->io_base + SPIFI_DATA);
- nxp_spifi_wait_for_cmd(spifi);
+ return nxp_spifi_wait_for_cmd(spifi);
}
static int nxp_spifi_erase(struct spi_nor *nor, loff_t offs)
diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 157841dc3e99..f7ffec60a460 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -1033,7 +1033,10 @@ static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
ret = nor->read(nor, from, len, retlen, buf);
spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_READ);
- return ret;
+ if (ret < 0)
+ return ret;
+
+ return 0;
}
static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 3c36113a88e1..a21c9e4f1fdf 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -172,9 +172,9 @@ struct spi_nor {
int (*read_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);
int (*write_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);
- int (*read)(struct spi_nor *nor, loff_t from,
+ ssize_t (*read)(struct spi_nor *nor, loff_t from,
size_t len, size_t *retlen, u_char *read_buf);
- void (*write)(struct spi_nor *nor, loff_t to,
+ ssize_t (*write)(struct spi_nor *nor, loff_t to,
size_t len, size_t *retlen, const u_char *write_buf);
int (*erase)(struct spi_nor *nor, loff_t offs);
--
2.8.0.rc3.226.g39d4020
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