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mtd: spi-nor: change return value of read/write 

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@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Tested-by Cyrille Pitchen <cyrille.pitchen@atmel.com>
Acked-by: Michal Suchanek <hramrach@gmail.com>
Tested-by: Michal Suchanek <hramrach@gmail.com>
This commit is contained in:
Michal Suchanek 2016-05-05 17:31:47 -07:00 committed by Brian Norris
parent becc7ae544
commit 59451e1233
6 changed files with 36 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/mtd/devices/m25p80.c
View File

@ -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;

5
drivers/mtd/spi-nor/fsl-quadspi.c
View File

@ -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;

22
drivers/mtd/spi-nor/mtk-quadspi.c
View File

@ -243,7 +243,7 @@ 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,
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;
@ -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,
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)

8
drivers/mtd/spi-nor/nxp-spifi.c
View File

@ -172,7 +172,7 @@ 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,
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;
@ -188,7 +188,7 @@ 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,
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;
@ -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)

3
drivers/mtd/spi-nor/spi-nor.c
View File

@ -1034,7 +1034,10 @@ 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);
if (ret < 0)
return ret;
return 0;
}
static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,

4
include/linux/mtd/spi-nor.h
View File

@ -173,9 +173,9 @@ 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);