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openwrt_NSS_ACW/target/linux/brcm63xx/patches-4.4/000-4.8-07-mtd-spi-nor-stop-passing-around-retlen.patch
Jonas Gorski 2a2b16210b brcm63xx: backport upstream solution for SPI message size limits 
Backport upstream solution for working around SPI controller maximum
message sizes.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
2017-06-04 10:40:00 +02:00

267 lines
7.7 KiB
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From 2dd087b16946cf168f401526adf26afa771bb740 Mon Sep 17 00:00:00 2001
From: Michal Suchanek <hramrach@gmail.com>
Date: Thu, 5 May 2016 17:31:53 -0700
Subject: [PATCH 07/10] mtd: spi-nor: stop passing around retlen
Do not pass retlen to hardware driver read/write functions. Update it in
spi-nor generic driver instead.
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>
---
drivers/mtd/devices/m25p80.c | 7 ++-----
drivers/mtd/spi-nor/fsl-quadspi.c | 17 ++++++-----------
drivers/mtd/spi-nor/nxp-spifi.c | 6 ++----
drivers/mtd/spi-nor/spi-nor.c | 21 +++++++++++++--------
include/linux/mtd/spi-nor.h | 4 ++--
6 files changed, 28 insertions(+), 35 deletions(-)
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -74,7 +74,7 @@ static int m25p80_write_reg(struct spi_n
}
static ssize_t m25p80_write(struct spi_nor *nor, loff_t to, size_t len,
- size_t *retlen, const u_char *buf)
+ const u_char *buf)
{
struct m25p *flash = nor->priv;
struct spi_device *spi = flash->spi;
@@ -106,7 +106,6 @@ static ssize_t m25p80_write(struct spi_n
ret = m.actual_length - cmd_sz;
if (ret < 0)
return -EIO;
- *retlen += ret;
return ret;
}
@@ -127,7 +126,7 @@ static inline unsigned int m25p80_rx_nbi
* may be any size provided it is within the physical boundaries.
*/
static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
- size_t *retlen, u_char *buf)
+ u_char *buf)
{
struct m25p *flash = nor->priv;
struct spi_device *spi = flash->spi;
@@ -156,7 +155,6 @@ static ssize_t m25p80_read(struct spi_no
msg.data_nbits = m25p80_rx_nbits(nor);
ret = spi_flash_read(spi, &msg);
- *retlen = msg.retlen;
if (ret < 0)
return ret;
return msg.retlen;
@@ -184,7 +182,6 @@ static ssize_t m25p80_read(struct spi_no
ret = m.actual_length - m25p_cmdsz(nor) - dummy;
if (ret < 0)
return -EIO;
- *retlen += ret;
return ret;
}
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -577,7 +577,7 @@ static inline void fsl_qspi_invalid(stru
static ssize_t fsl_qspi_nor_write(struct fsl_qspi *q, struct spi_nor *nor,
u8 opcode, unsigned int to, u32 *txbuf,
- unsigned count, size_t *retlen)
+ unsigned count)
{
int ret, i, j;
u32 tmp;
@@ -604,11 +604,8 @@ static ssize_t fsl_qspi_nor_write(struct
/* Trigger it */
ret = fsl_qspi_runcmd(q, opcode, to, count);
- if (ret == 0) {
- if (retlen)
- *retlen += count;
+ if (ret == 0)
return count;
- }
return ret;
}
@@ -816,7 +813,7 @@ static int fsl_qspi_write_reg(struct spi
} else if (len > 0) {
ret = fsl_qspi_nor_write(q, nor, opcode, 0,
- (u32 *)buf, len, NULL);
+ (u32 *)buf, len);
if (ret > 0)
return 0;
} else {
@@ -828,12 +825,11 @@ static int fsl_qspi_write_reg(struct spi
}
static ssize_t fsl_qspi_write(struct spi_nor *nor, loff_t to,
- size_t len, size_t *retlen, const u_char *buf)
+ size_t len, const u_char *buf)
{
struct fsl_qspi *q = nor->priv;
-
ssize_t ret = fsl_qspi_nor_write(q, nor, nor->program_opcode, to,
- (u32 *)buf, len, retlen);
+ (u32 *)buf, len);
/* invalid the data in the AHB buffer. */
fsl_qspi_invalid(q);
@@ -841,7 +837,7 @@ static ssize_t fsl_qspi_write(struct spi
}
static ssize_t fsl_qspi_read(struct spi_nor *nor, loff_t from,
- size_t len, size_t *retlen, u_char *buf)
+ size_t len, u_char *buf)
{
struct fsl_qspi *q = nor->priv;
u8 cmd = nor->read_opcode;
@@ -883,7 +879,6 @@ static ssize_t fsl_qspi_read(struct spi_
memcpy(buf, q->ahb_addr + q->chip_base_addr + from - q->memmap_offs,
len);
- *retlen += len;
return len;
}
--- a/drivers/mtd/spi-nor/nxp-spifi.c
+++ b/drivers/mtd/spi-nor/nxp-spifi.c
@@ -173,7 +173,7 @@ static int nxp_spifi_write_reg(struct sp
}
static ssize_t nxp_spifi_read(struct spi_nor *nor, loff_t from, size_t len,
- size_t *retlen, u_char *buf)
+ u_char *buf)
{
struct nxp_spifi *spifi = nor->priv;
int ret;
@@ -183,13 +183,12 @@ static ssize_t nxp_spifi_read(struct spi
return ret;
memcpy_fromio(buf, spifi->flash_base + from, len);
- *retlen += len;
return len;
}
static ssize_t nxp_spifi_write(struct spi_nor *nor, loff_t to, size_t len,
- size_t *retlen, const u_char *buf)
+ const u_char *buf)
{
struct nxp_spifi *spifi = nor->priv;
u32 cmd;
@@ -201,7 +200,6 @@ static ssize_t nxp_spifi_write(struct sp
return ret;
writel(to, spifi->io_base + SPIFI_ADDR);
- *retlen += len;
cmd = SPIFI_CMD_DOUT |
SPIFI_CMD_DATALEN(len) |
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -890,12 +890,13 @@ static int spi_nor_read(struct mtd_info
if (ret)
return ret;
- ret = nor->read(nor, from, len, retlen, buf);
+ ret = nor->read(nor, from, len, buf);
spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_READ);
if (ret < 0)
return ret;
+ *retlen += ret;
return 0;
}
@@ -922,7 +923,7 @@ static int sst_write(struct mtd_info *mt
nor->program_opcode = SPINOR_OP_BP;
/* write one byte. */
- ret = nor->write(nor, to, 1, retlen, buf);
+ ret = nor->write(nor, to, 1, buf);
if (ret < 0)
goto sst_write_err;
WARN(ret != 1, "While writing 1 byte written %i bytes\n",
@@ -938,7 +939,7 @@ static int sst_write(struct mtd_info *mt
nor->program_opcode = SPINOR_OP_AAI_WP;
/* write two bytes. */
- ret = nor->write(nor, to, 2, retlen, buf + actual);
+ ret = nor->write(nor, to, 2, buf + actual);
if (ret < 0)
goto sst_write_err;
WARN(ret != 2, "While writing 2 bytes written %i bytes\n",
@@ -961,7 +962,7 @@ static int sst_write(struct mtd_info *mt
write_enable(nor);
nor->program_opcode = SPINOR_OP_BP;
- ret = nor->write(nor, to, 1, retlen, buf + actual);
+ ret = nor->write(nor, to, 1, buf + actual);
if (ret < 0)
goto sst_write_err;
WARN(ret != 1, "While writing 1 byte written %i bytes\n",
@@ -970,8 +971,10 @@ static int sst_write(struct mtd_info *mt
if (ret)
goto sst_write_err;
write_disable(nor);
+ actual += 1;
}
sst_write_err:
+ *retlen += actual;
spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_WRITE);
return ret;
}
@@ -1000,15 +1003,17 @@ static int spi_nor_write(struct mtd_info
/* do all the bytes fit onto one page? */
if (page_offset + len <= nor->page_size) {
- ret = nor->write(nor, to, len, retlen, buf);
+ ret = nor->write(nor, to, len, buf);
if (ret < 0)
goto write_err;
+ *retlen += ret;
} else {
/* the size of data remaining on the first page */
page_size = nor->page_size - page_offset;
- ret = nor->write(nor, to, page_size, retlen, buf);
+ ret = nor->write(nor, to, page_size, buf);
if (ret < 0)
goto write_err;
+ *retlen += ret;
/* write everything in nor->page_size chunks */
for (i = ret; i < len; ) {
@@ -1022,10 +1027,10 @@ static int spi_nor_write(struct mtd_info
write_enable(nor);
- ret = nor->write(nor, to + i, page_size, retlen,
- buf + i);
+ ret = nor->write(nor, to + i, page_size, buf + i);
if (ret < 0)
goto write_err;
+ *retlen += ret;
i += ret;
}
}
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -170,9 +170,9 @@ struct spi_nor {
int (*write_reg)(struct spi_nor *nor, u8 opcode, u8 *buf, int len);
ssize_t (*read)(struct spi_nor *nor, loff_t from,
- size_t len, size_t *retlen, u_char *read_buf);
+ size_t len, u_char *read_buf);
ssize_t (*write)(struct spi_nor *nor, loff_t to,
- size_t len, size_t *retlen, const u_char *write_buf);
+ size_t len, const u_char *write_buf);
int (*erase)(struct spi_nor *nor, loff_t offs);
int (*flash_lock)(struct spi_nor *nor, loff_t ofs, uint64_t len);
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