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brcm63xx: backport upstream solution for SPI message size limits

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Backport upstream solution for working around SPI controller maximum
message sizes.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
master
Jonas Gorski 8 years ago
parent f62e02cf20
commit 2a2b16210b
18 changed files with 1135 additions and 102 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 51
      target/linux/brcm63xx/patches-4.4/000-4.5-20-spi-expose-master-transfer-size-limitation.patch
  2. 149
      target/linux/brcm63xx/patches-4.4/000-4.8-01-mtd-spi-nor-change-return-value-of-read-write.patch
  3. 91
      target/linux/brcm63xx/patches-4.4/000-4.8-02-mtd-m25p80-return-amount-of-data-transferred-or-erro.patch
  4. 72
      target/linux/brcm63xx/patches-4.4/000-4.8-03-mtd-fsl-quadspi-return-amount-of-data-read-written-o.patch
  5. 51
      target/linux/brcm63xx/patches-4.4/000-4.8-05-mtd-nxp-spifi-return-amount-of-data-transferred-or-e.patch
  6. 118
      target/linux/brcm63xx/patches-4.4/000-4.8-06-mtd-spi-nor-check-return-value-from-write.patch
  7. 266
      target/linux/brcm63xx/patches-4.4/000-4.8-07-mtd-spi-nor-stop-passing-around-retlen.patch
  8. 103
      target/linux/brcm63xx/patches-4.4/000-4.8-08-mtd-spi-nor-simplify-write-loop.patch
  9. 54
      target/linux/brcm63xx/patches-4.4/000-4.8-09-mtd-spi-nor-add-read-loop.patch
  10. 26
      target/linux/brcm63xx/patches-4.4/000-4.8-10-mtd-m25p80-read-in-spi_max_transfer_size-chunks.patch
  11. 73
      target/linux/brcm63xx/patches-4.4/000-4.9-01-spi-introduce-max_message_size-hook-in-spi_master.patch
  12. 30
      target/linux/brcm63xx/patches-4.4/001-4.11-01-mtd-m25p80-consider-max-message-size-in-m25p80_read.patch
  13. 42
      target/linux/brcm63xx/patches-4.4/001-4.12-01-spi-bcm63xx-make-spi-subsystem-aware-of-message-size.patch
  14. 2
      target/linux/brcm63xx/patches-4.4/202-MTD-DEVICES-m25p80-use-parsers-if-provided-in-flash-.patch
  15. 90
      target/linux/brcm63xx/patches-4.4/203-MTD-DEVICES-m25p80-add-support-for-limiting-reads.patch
  16. 5
      target/linux/brcm63xx/patches-4.4/411-MIPS-BCM63XX-Register-SPI-flash-if-present.patch
  17. 12
      target/linux/brcm63xx/patches-4.4/414-MTD-m25p80-allow-passing-pp_data.patch
  18. 2
      target/linux/brcm63xx/patches-4.4/415-MIPS-BCM63XX-export-the-attached-flash-type.patch

51
target/linux/brcm63xx/patches-4.4/000-4.5-20-spi-expose-master-transfer-size-limitation.patch
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From 4acad4aae10d1fa79a075b38b5c73772c44f576c Mon Sep 17 00:00:00 2001
From: Michal Suchanek <hramrach@gmail.com>
Date: Wed, 2 Dec 2015 10:38:21 +0000
Subject: [PATCH] spi: expose master transfer size limitation.
On some SPI controllers it is not feasible to transfer arbitrary amount
of data at once.
When the limit on transfer size is a few kilobytes at least it makes
sense to use the SPI hardware rather than reverting to gpio driver.
The protocol drivers need a way to check that they do not sent overly
long messages, though.
Signed-off-by: Michal Suchanek <hramrach@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
include/linux/spi/spi.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -428,6 +428,12 @@ struct spi_master {
#define SPI_MASTER_MUST_RX BIT(3) /* requires rx */
#define SPI_MASTER_MUST_TX BIT(4) /* requires tx */
+ /*
+ * on some hardware transfer size may be constrained
+ * the limit may depend on device transfer settings
+ */
+ size_t (*max_transfer_size)(struct spi_device *spi);
+
/* lock and mutex for SPI bus locking */
spinlock_t bus_lock_spinlock;
struct mutex bus_lock_mutex;
@@ -837,6 +843,15 @@ extern int spi_async(struct spi_device *
extern int spi_async_locked(struct spi_device *spi,
struct spi_message *message);
+static inline size_t
+spi_max_transfer_size(struct spi_device *spi)
+{
+ struct spi_master *master = spi->master;
+ if (!master->max_transfer_size)
+ return SIZE_MAX;
+ return master->max_transfer_size(spi);
+}
+
/*---------------------------------------------------------------------------*/
/* All these synchronous SPI transfer routines are utilities layered

149
target/linux/brcm63xx/patches-4.4/000-4.8-01-mtd-spi-nor-change-return-value-of-read-write.patch
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From 59451e1233bd315c5379a631838a03d80e689581 Mon Sep 17 00:00:00 2001
From: Michal Suchanek <hramrach@gmail.com>
Date: Thu, 5 May 2016 17:31:47 -0700
Subject: [PATCH 01/10] 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>
---
drivers/mtd/devices/m25p80.c | 5 +++--
drivers/mtd/spi-nor/fsl-quadspi.c | 5 +++--
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(-)
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -73,7 +73,7 @@ static int m25p80_write_reg(struct spi_n
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
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_nbi
* 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;
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -822,7 +822,7 @@ static int fsl_qspi_write_reg(struct spi
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;
@@ -832,9 +832,10 @@ static void fsl_qspi_write(struct spi_no
/* 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;
--- 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 sp
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
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_n
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_n
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)
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -893,7 +893,10 @@ static int spi_nor_read(struct mtd_info
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,
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -169,9 +169,9 @@ 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);

91
target/linux/brcm63xx/patches-4.4/000-4.8-02-mtd-m25p80-return-amount-of-data-transferred-or-erro.patch
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From 1992297b0810a42d78ec7b4de15304eb0489fd97 Mon Sep 17 00:00:00 2001
From: Michal Suchanek <hramrach@gmail.com>
Date: Thu, 5 May 2016 17:31:48 -0700
Subject: [PATCH 02/10] mtd: m25p80: return amount of data transferred or error
in read/write
Add checking of SPI transfer errors and return them from read/write
functions. Also return the amount of data transferred.
Signed-off-by: Michal Suchanek <hramrach@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Michal Suchanek <hramrach@gmail.com>
Tested-by: Michal Suchanek <hramrach@gmail.com>
---
drivers/mtd/devices/m25p80.c | 29 +++++++++++++++++++++--------
1 file changed, 21 insertions(+), 8 deletions(-)
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -81,6 +81,7 @@ static ssize_t m25p80_write(struct spi_n
struct spi_transfer t[2] = {};
struct spi_message m;
int cmd_sz = m25p_cmdsz(nor);
+ ssize_t ret;
spi_message_init(&m);
@@ -98,10 +99,15 @@ static ssize_t m25p80_write(struct spi_n
t[1].len = len;
spi_message_add_tail(&t[1], &m);
- spi_sync(spi, &m);
+ ret = spi_sync(spi, &m);
+ if (ret)
+ return ret;
- *retlen += m.actual_length - cmd_sz;
- return 0;
+ ret = m.actual_length - cmd_sz;
+ if (ret < 0)
+ return -EIO;
+ *retlen += ret;
+ return ret;
}
static inline unsigned int m25p80_rx_nbits(struct spi_nor *nor)
@@ -128,13 +134,13 @@ static ssize_t m25p80_read(struct spi_no
struct spi_transfer t[2];
struct spi_message m;
unsigned int dummy = nor->read_dummy;
+ ssize_t ret;
/* convert the dummy cycles to the number of bytes */
dummy /= 8;
if (spi_flash_read_supported(spi)) {
struct spi_flash_read_message msg;
- int ret;
memset(&msg, 0, sizeof(msg));
@@ -151,7 +157,9 @@ static ssize_t m25p80_read(struct spi_no
ret = spi_flash_read(spi, &msg);
*retlen = msg.retlen;
- return ret;
+ if (ret < 0)
+ return ret;
+ return msg.retlen;
}
spi_message_init(&m);
@@ -169,10 +177,15 @@ static ssize_t m25p80_read(struct spi_no
t[1].len = len;
spi_message_add_tail(&t[1], &m);
- spi_sync(spi, &m);
+ ret = spi_sync(spi, &m);
+ if (ret)
+ return ret;
- *retlen = m.actual_length - m25p_cmdsz(nor) - dummy;
- return 0;
+ ret = m.actual_length - m25p_cmdsz(nor) - dummy;
+ if (ret < 0)
+ return -EIO;
+ *retlen += ret;
+ return ret;
}
static int m25p80_erase(struct spi_nor *nor, loff_t offset)

72
target/linux/brcm63xx/patches-4.4/000-4.8-03-mtd-fsl-quadspi-return-amount-of-data-read-written-o.patch
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From fc0d7e542a0d4193521899d15f8f4999dc295323 Mon Sep 17 00:00:00 2001
From: Michal Suchanek <hramrach@gmail.com>
Date: Thu, 5 May 2016 17:31:49 -0700
Subject: [PATCH 03/10] mtd: fsl-quadspi: return amount of data read/written or
error
Return amount of data read/written or error as read(2)/write(2) does.
Signed-off-by: Michal Suchanek <hramrach@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---
drivers/mtd/spi-nor/fsl-quadspi.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
--- a/drivers/mtd/spi-nor/fsl-quadspi.c
+++ b/drivers/mtd/spi-nor/fsl-quadspi.c
@@ -575,7 +575,7 @@ static inline void fsl_qspi_invalid(stru
writel(reg, q->iobase + QUADSPI_MCR);
}
-static int fsl_qspi_nor_write(struct fsl_qspi *q, struct spi_nor *nor,
+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)
{
@@ -604,8 +604,11 @@ static int fsl_qspi_nor_write(struct fsl
/* Trigger it */
ret = fsl_qspi_runcmd(q, opcode, to, count);
- if (ret == 0 && retlen)
- *retlen += count;
+ if (ret == 0) {
+ if (retlen)
+ *retlen += count;
+ return count;
+ }
return ret;
}
@@ -814,6 +817,8 @@ 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);
+ if (ret > 0)
+ return 0;
} else {
dev_err(q->dev, "invalid cmd %d\n", opcode);
ret = -EINVAL;
@@ -827,12 +832,12 @@ static ssize_t fsl_qspi_write(struct spi
{
struct fsl_qspi *q = nor->priv;
- fsl_qspi_nor_write(q, nor, nor->program_opcode, to,
+ ssize_t ret = fsl_qspi_nor_write(q, nor, nor->program_opcode, to,
(u32 *)buf, len, retlen);
/* invalid the data in the AHB buffer. */
fsl_qspi_invalid(q);
- return 0;
+ return ret;
}
static ssize_t fsl_qspi_read(struct spi_nor *nor, loff_t from,
@@ -879,7 +884,7 @@ static ssize_t fsl_qspi_read(struct spi_
len);
*retlen += len;
- return 0;
+ return len;
}
static int fsl_qspi_erase(struct spi_nor *nor, loff_t offs)

51
target/linux/brcm63xx/patches-4.4/000-4.8-05-mtd-nxp-spifi-return-amount-of-data-transferred-or-e.patch
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From bc418cd2652f47a327e27f978caa3d85f9558b09 Mon Sep 17 00:00:00 2001
From: Brian Norris <computersforpeace@gmail.com>
Date: Thu, 5 May 2016 17:31:51 -0700
Subject: [PATCH 05/10] mtd: nxp-spifi: return amount of data transferred or
error in read/write
Add checking of SPI transfer errors and return them from read/write
functions. Also return the amount of data transferred.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---
drivers/mtd/spi-nor/nxp-spifi.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
--- a/drivers/mtd/spi-nor/nxp-spifi.c
+++ b/drivers/mtd/spi-nor/nxp-spifi.c
@@ -185,7 +185,7 @@ static ssize_t nxp_spifi_read(struct spi
memcpy_fromio(buf, spifi->flash_base + from, len);
*retlen += len;
- return 0;
+ return len;
}
static ssize_t nxp_spifi_write(struct spi_nor *nor, loff_t to, size_t len,
@@ -194,6 +194,7 @@ static ssize_t nxp_spifi_write(struct sp
struct nxp_spifi *spifi = nor->priv;
u32 cmd;
int ret;
+ size_t i;
ret = nxp_spifi_set_memory_mode_off(spifi);
if (ret)
@@ -209,10 +210,14 @@ static ssize_t nxp_spifi_write(struct sp
SPIFI_CMD_FRAMEFORM(spifi->nor.addr_width + 1);
writel(cmd, spifi->io_base + SPIFI_CMD);
- while (len--)
- writeb(*buf++, spifi->io_base + SPIFI_DATA);
+ for (i = 0; i < len; i++)
+ writeb(buf[i], spifi->io_base + SPIFI_DATA);
- return nxp_spifi_wait_for_cmd(spifi);
+ ret = nxp_spifi_wait_for_cmd(spifi);
+ if (ret)
+ return ret;
+
+ return len;
}
static int nxp_spifi_erase(struct spi_nor *nor, loff_t offs)

118
target/linux/brcm63xx/patches-4.4/000-4.8-06-mtd-spi-nor-check-return-value-from-write.patch
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From 0bad7b9304d543dd7627f4cd564aea5d7338b950 Mon Sep 17 00:00:00 2001
From: Michal Suchanek <hramrach@gmail.com>
Date: Thu, 5 May 2016 17:31:52 -0700
Subject: [PATCH 06/10] mtd: spi-nor: check return value from write
SPI NOR hardware drivers now return useful value from their write
functions so check them.
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/spi-nor/spi-nor.c | 45 ++++++++++++++++++++++++++++++-------------
1 file changed, 32 insertions(+), 13 deletions(-)
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -922,10 +922,14 @@ static int sst_write(struct mtd_info *mt
nor->program_opcode = SPINOR_OP_BP;
/* write one byte. */
- nor->write(nor, to, 1, retlen, buf);
+ ret = nor->write(nor, to, 1, retlen, buf);
+ if (ret < 0)
+ goto sst_write_err;
+ WARN(ret != 1, "While writing 1 byte written %i bytes\n",
+ (int)ret);
ret = spi_nor_wait_till_ready(nor);
if (ret)
- goto time_out;
+ goto sst_write_err;
}
to += actual;
@@ -934,10 +938,14 @@ static int sst_write(struct mtd_info *mt
nor->program_opcode = SPINOR_OP_AAI_WP;
/* write two bytes. */
- nor->write(nor, to, 2, retlen, buf + actual);
+ ret = nor->write(nor, to, 2, retlen, buf + actual);
+ if (ret < 0)
+ goto sst_write_err;
+ WARN(ret != 2, "While writing 2 bytes written %i bytes\n",
+ (int)ret);
ret = spi_nor_wait_till_ready(nor);
if (ret)
- goto time_out;
+ goto sst_write_err;
to += 2;
nor->sst_write_second = true;
}
@@ -946,21 +954,24 @@ static int sst_write(struct mtd_info *mt
write_disable(nor);
ret = spi_nor_wait_till_ready(nor);
if (ret)
- goto time_out;
+ goto sst_write_err;
/* Write out trailing byte if it exists. */
if (actual != len) {
write_enable(nor);
nor->program_opcode = SPINOR_OP_BP;
- nor->write(nor, to, 1, retlen, buf + actual);
-
+ ret = nor->write(nor, to, 1, retlen, buf + actual);
+ if (ret < 0)
+ goto sst_write_err;
+ WARN(ret != 1, "While writing 1 byte written %i bytes\n",
+ (int)ret);
ret = spi_nor_wait_till_ready(nor);
if (ret)
- goto time_out;
+ goto sst_write_err;
write_disable(nor);
}
-time_out:
+sst_write_err:
spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_WRITE);
return ret;
}
@@ -989,14 +1000,18 @@ static int spi_nor_write(struct mtd_info
/* do all the bytes fit onto one page? */
if (page_offset + len <= nor->page_size) {
- nor->write(nor, to, len, retlen, buf);
+ ret = nor->write(nor, to, len, retlen, buf);
+ if (ret < 0)
+ goto write_err;
} else {
/* the size of data remaining on the first page */
page_size = nor->page_size - page_offset;
- nor->write(nor, to, page_size, retlen, buf);
+ ret = nor->write(nor, to, page_size, retlen, buf);
+ if (ret < 0)
+ goto write_err;
/* write everything in nor->page_size chunks */
- for (i = page_size; i < len; i += page_size) {
+ for (i = ret; i < len; ) {
page_size = len - i;
if (page_size > nor->page_size)
page_size = nor->page_size;
@@ -1007,7 +1022,11 @@ static int spi_nor_write(struct mtd_info
write_enable(nor);
- nor->write(nor, to + i, page_size, retlen, buf + i);
+ ret = nor->write(nor, to + i, page_size, retlen,
+ buf + i);
+ if (ret < 0)
+ goto write_err;
+ i += ret;
}
}

266
target/linux/brcm63xx/patches-4.4/000-4.8-07-mtd-spi-nor-stop-passing-around-retlen.patch
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@ -0,0 +1,266 @@
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);

103
target/linux/brcm63xx/patches-4.4/000-4.8-08-mtd-spi-nor-simplify-write-loop.patch
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From e5d05cbd6d8b01f08c95c427a36c66aac769af4f Mon Sep 17 00:00:00 2001
From: Michal Suchanek <hramrach@gmail.com>
Date: Thu, 5 May 2016 17:31:54 -0700
Subject: [PATCH 08/10] mtd: spi-nor: simplify write loop
The spi-nor write loop assumes that what is passed to the hardware
driver write() is what gets written.
When write() writes less than page size at once data is dropped on the
floor. Check the amount of data writen and exit if it does not match
requested amount.
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/spi-nor/spi-nor.c | 58 +++++++++++++++++++------------------------
1 file changed, 25 insertions(+), 33 deletions(-)
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -988,8 +988,8 @@ static int spi_nor_write(struct mtd_info
size_t *retlen, const u_char *buf)
{
struct spi_nor *nor = mtd_to_spi_nor(mtd);
- u32 page_offset, page_size, i;
- int ret;
+ size_t page_offset, page_remain, i;
+ ssize_t ret;
dev_dbg(nor->dev, "to 0x%08x, len %zd\n", (u32)to, len);
@@ -997,45 +997,37 @@ static int spi_nor_write(struct mtd_info
if (ret)
return ret;
- write_enable(nor);
+ for (i = 0; i < len; ) {
+ ssize_t written;
- page_offset = to & (nor->page_size - 1);
-
- /* do all the bytes fit onto one page? */
- if (page_offset + len <= nor->page_size) {
- ret = nor->write(nor, to, len, buf);
- if (ret < 0)
- goto write_err;
- *retlen += ret;
- } else {
+ page_offset = (to + i) & (nor->page_size - 1);
+ WARN_ONCE(page_offset,
+ "Writing at offset %zu into a NOR page. Writing partial pages may decrease reliability and increase wear of NOR flash.",
+ page_offset);
/* the size of data remaining on the first page */
- page_size = nor->page_size - page_offset;
- ret = nor->write(nor, to, page_size, buf);
+ page_remain = min_t(size_t,
+ nor->page_size - page_offset, len - i);
+
+ write_enable(nor);
+ ret = nor->write(nor, to + i, page_remain, buf + i);
if (ret < 0)
goto write_err;
- *retlen += ret;
+ written = ret;
- /* write everything in nor->page_size chunks */
- for (i = ret; i < len; ) {
- page_size = len - i;
- if (page_size > nor->page_size)
- page_size = nor->page_size;
-
- ret = spi_nor_wait_till_ready(nor);
- if (ret)
- goto write_err;
-
- write_enable(nor);
-
- ret = nor->write(nor, to + i, page_size, buf + i);
- if (ret < 0)
- goto write_err;
- *retlen += ret;
- i += ret;
+ ret = spi_nor_wait_till_ready(nor);
+ if (ret)
+ goto write_err;
+ *retlen += written;
+ i += written;
+ if (written != page_remain) {
+ dev_err(nor->dev,
+ "While writing %zu bytes written %zd bytes\n",
+ page_remain, written);
+ ret = -EIO;
+ goto write_err;
}
}
- ret = spi_nor_wait_till_ready(nor);
write_err:
spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_WRITE);
return ret;

54
target/linux/brcm63xx/patches-4.4/000-4.8-09-mtd-spi-nor-add-read-loop.patch
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From 26f9bcad29a6c240881bd4efc90f16a9990dd6c2 Mon Sep 17 00:00:00 2001
From: Michal Suchanek <hramrach@gmail.com>
Date: Thu, 5 May 2016 17:31:55 -0700
Subject: [PATCH 09/10] mtd: spi-nor: add read loop
mtdblock and ubi do not handle the situation when read returns less data
than requested. Loop in spi-nor until buffer is filled or an error is
returned.
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/spi-nor/spi-nor.c | 25 +++++++++++++++++++------
1 file changed, 19 insertions(+), 6 deletions(-)
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -890,14 +890,27 @@ static int spi_nor_read(struct mtd_info
if (ret)
return ret;
- ret = nor->read(nor, from, len, buf);
+ while (len) {
+ ret = nor->read(nor, from, len, buf);
+ if (ret == 0) {
+ /* We shouldn't see 0-length reads */
+ ret = -EIO;
+ goto read_err;
+ }
+ if (ret < 0)
+ goto read_err;
- spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_READ);
- if (ret < 0)
- return ret;
+ WARN_ON(ret > len);
+ *retlen += ret;
+ buf += ret;
+ from += ret;
+ len -= ret;
+ }
+ ret = 0;
- *retlen += ret;
- return 0;
+read_err:
+ spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_READ);
+ return ret;
}
static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,

26
target/linux/brcm63xx/patches-4.4/000-4.8-10-mtd-m25p80-read-in-spi_max_transfer_size-chunks.patch
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From 95193796256cfce16e5d881318e15b6b04062c15 Mon Sep 17 00:00:00 2001
From: Michal Suchanek <hramrach@gmail.com>
Date: Thu, 5 May 2016 17:31:56 -0700
Subject: [PATCH 10/10] mtd: m25p80: read in spi_max_transfer_size chunks
Take into account transfer size limitation of SPI master.
Signed-off-by: Michal Suchanek <hramrach@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Michal Suchanek <hramrach@gmail.com>
Tested-by: Michal Suchanek <hramrach@gmail.com>
---
drivers/mtd/devices/m25p80.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -172,7 +172,7 @@ static ssize_t m25p80_read(struct spi_no
t[1].rx_buf = buf;
t[1].rx_nbits = m25p80_rx_nbits(nor);
- t[1].len = len;
+ t[1].len = min(len, spi_max_transfer_size(spi));
spi_message_add_tail(&t[1], &m);
ret = spi_sync(spi, &m);

73
target/linux/brcm63xx/patches-4.4/000-4.9-01-spi-introduce-max_message_size-hook-in-spi_master.patch
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From 5090cc6ae2f79ee779e5faf7c8a28edf42b7d738 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Wed, 17 Aug 2016 21:08:01 +0200
Subject: [PATCH] spi: introduce max_message_size hook in spi_master
Recently a maximum transfer size was was introduced in struct spi_master.
However there are also spi controllers with a maximum message size, e.g.
fsl-espi has a max message size of 64KB.
Introduce a hook max_message_size to deal with such limitations.
Also make sure that spi_max_transfer_size doesn't return greater values
than spi_max_message_size, even if hook max_transfer_size is not set.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
include/linux/spi/spi.h | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -304,6 +304,8 @@ static inline void spi_unregister_driver
* @min_speed_hz: Lowest supported transfer speed
* @max_speed_hz: Highest supported transfer speed
* @flags: other constraints relevant to this driver
+ * @max_message_size: function that returns the max message size for
+ * a &spi_device; may be %NULL, so the default %SIZE_MAX will be used.
* @bus_lock_spinlock: spinlock for SPI bus locking
* @bus_lock_mutex: mutex for SPI bus locking
* @bus_lock_flag: indicates that the SPI bus is locked for exclusive use
@@ -429,10 +431,11 @@ struct spi_master {
#define SPI_MASTER_MUST_TX BIT(4) /* requires tx */
/*
- * on some hardware transfer size may be constrained
+ * on some hardware transfer / message size may be constrained
* the limit may depend on device transfer settings
*/
size_t (*max_transfer_size)(struct spi_device *spi);
+ size_t (*max_message_size)(struct spi_device *spi);
/* lock and mutex for SPI bus locking */
spinlock_t bus_lock_spinlock;
@@ -844,12 +847,26 @@ extern int spi_async_locked(struct spi_d
struct spi_message *message);
static inline size_t
-spi_max_transfer_size(struct spi_device *spi)
+spi_max_message_size(struct spi_device *spi)
{
struct spi_master *master = spi->master;
- if (!master->max_transfer_size)
+ if (!master->max_message_size)
return SIZE_MAX;
- return master->max_transfer_size(spi);
+ return master->max_message_size(spi);
+}
+
+static inline size_t
+spi_max_transfer_size(struct spi_device *spi)
+{
+ struct spi_master *master = spi->master;
+ size_t tr_max = SIZE_MAX;
+ size_t msg_max = spi_max_message_size(spi);
+
+ if (master->max_transfer_size)
+ tr_max = master->max_transfer_size(spi);
+
+ /* transfer size limit must not be greater than messsage size limit */
+ return min(tr_max, msg_max);
}
/*---------------------------------------------------------------------------*/

30
target/linux/brcm63xx/patches-4.4/001-4.11-01-mtd-m25p80-consider-max-message-size-in-m25p80_read.patch
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From 80a79a889ce5df16c5261ab2f1e8e63b94b78102 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Fri, 28 Oct 2016 07:58:46 +0200
Subject: [PATCH 1/8] mtd: m25p80: consider max message size in m25p80_read
Consider a message size limit when calculating the maximum amount
of data that can be read.
The message size limit has been introduced with 4.9, so cc it
to stable.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Cc: <stable@vger.kernel.org> # 4.9.x
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
drivers/mtd/devices/m25p80.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -172,7 +172,8 @@ static ssize_t m25p80_read(struct spi_no
t[1].rx_buf = buf;
t[1].rx_nbits = m25p80_rx_nbits(nor);
- t[1].len = min(len, spi_max_transfer_size(spi));
+ t[1].len = min3(len, spi_max_transfer_size(spi),
+ spi_max_message_size(spi) - t[0].len);
spi_message_add_tail(&t[1], &m);
ret = spi_sync(spi, &m);

42
target/linux/brcm63xx/patches-4.4/001-4.12-01-spi-bcm63xx-make-spi-subsystem-aware-of-message-size.patch
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From 3fcc36962c32ad0af2d5904103e2b2b824b6b1aa Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jonas.gorski@gmail.com>
Date: Sat, 4 Feb 2017 12:32:59 +0100
Subject: [PATCH 2/8] spi/bcm63xx: make spi subsystem aware of message size
limits
The bcm63xx LS SPI controller does not allow manual control of the CS
lines and will toggle it automatically before after sending data, so we
are limited to messages that fit in the FIFO buffer. Since the CS lines
aren't available as GPIOs either, we will need to make slave drivers
aware of this limitation and handle it accordingly.
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
---
drivers/spi/spi-bcm63xx.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/spi/spi-bcm63xx.c
+++ b/drivers/spi/spi-bcm63xx.c
@@ -429,6 +429,13 @@ static irqreturn_t bcm63xx_spi_interrupt
return IRQ_HANDLED;
}
+static size_t bcm63xx_spi_max_length(struct spi_device *spi)
+{
+ struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master);
+
+ return bs->fifo_size;
+}
+
static const unsigned long bcm6348_spi_reg_offsets[] = {
[SPI_CMD] = SPI_6348_CMD,
[SPI_INT_STATUS] = SPI_6348_INT_STATUS,
@@ -542,6 +549,8 @@ static int bcm63xx_spi_probe(struct plat
master->transfer_one_message = bcm63xx_spi_transfer_one;
master->mode_bits = MODEBITS;
master->bits_per_word_mask = SPI_BPW_MASK(8);
+ master->max_transfer_size = bcm63xx_spi_max_length;
+ master->max_message_size = bcm63xx_spi_max_length;
master->auto_runtime_pm = true;
bs->msg_type_shift = bs->reg_offsets[SPI_MSG_TYPE_SHIFT];
bs->msg_ctl_width = bs->reg_offsets[SPI_MSG_CTL_WIDTH];

2
target/linux/brcm63xx/patches-4.4/202-MTD-DEVICES-m25p80-use-parsers-if-provided-in-flash-.patch
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@ -11,7 +11,7 @@ Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -248,8 +248,10 @@ static int m25p_probe(struct spi_device
@@ -260,8 +260,10 @@ static int m25p_probe(struct spi_device
if (ret)
return ret;

90
target/linux/brcm63xx/patches-4.4/203-MTD-DEVICES-m25p80-add-support-for-limiting-reads.patch
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@ -1,90 +0,0 @@
From 5fb4e8d7287ac8fcb33aae8b1e9e22c5a3c392bd Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jonas.gorski@gmail.com>
Date: Thu, 10 Nov 2011 17:33:40 +0100
Subject: [PATCH 51/79] MTD: DEVICES: m25p80: add support for limiting reads
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
---
drivers/mtd/devices/m25p80.c | 29 +++++++++++++++++++++++++++--
include/linux/spi/flash.h | 4 ++++
2 files changed, 31 insertions(+), 2 deletions(-)
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -31,6 +31,7 @@
struct m25p {
struct spi_device *spi;
struct spi_nor spi_nor;
+ int max_transfer_len;
u8 command[MAX_CMD_SIZE];
};
@@ -119,7 +120,7 @@ static inline unsigned int m25p80_rx_nbi
* 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 int __m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
struct m25p *flash = nor->priv;
@@ -174,6 +175,29 @@ static int m25p80_read(struct spi_nor *n
return 0;
}
+static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ struct m25p *flash = nor->priv;
+ size_t off;
+ size_t read_len = flash->max_transfer_len;
+ size_t part_len;
+ int ret = 0;
+
+ if (!read_len)
+ return __m25p80_read(nor, from, len, retlen, buf);
+
+ *retlen = 0;
+
+ for (off = 0; off < len && !ret; off += read_len) {
+ ret = __m25p80_read(nor, from + off, min(len - off, read_len),
+ &part_len, buf + off);
+ *retlen += part_len;
+ }
+
+ return ret;
+}
+
static int m25p80_erase(struct spi_nor *nor, loff_t offset)
{
struct m25p *flash = nor->priv;
@@ -244,6 +268,9 @@ static int m25p_probe(struct spi_device
else
flash_name = spi->modalias;
+ if (data)
+ flash->max_transfer_len = data->max_transfer_len;
+
ret = spi_nor_scan(nor, flash_name, mode);
if (ret)
return ret;
--- a/include/linux/spi/flash.h
+++ b/include/linux/spi/flash.h
@@ -13,6 +13,8 @@ struct mtd_part_parser_data;
* @part_probe_types: optional list of MTD parser names to use for
* partitioning
*
+ * @max_transfer_len: option maximum read/write length limitation for
+ * SPI controllers not able to transfer any length commands.
* Board init code (in arch/.../mach-xxx/board-yyy.c files) can
* provide information about SPI flash parts (such as DataFlash) to
* help set up the device and its appropriate default partitioning.
@@ -28,6 +30,8 @@ struct flash_platform_data {
char *type;
const char **part_probe_types;
+
+ unsigned int max_transfer_len;
/* we'll likely add more ... use JEDEC IDs, etc */
};

5
target/linux/brcm63xx/patches-4.4/411-MIPS-BCM63XX-Register-SPI-flash-if-present.patch
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@ -95,7 +95,7 @@ Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
if (val & STRAPBUS_63268_BOOT_SEL_SERIAL)
return BCM63XX_FLASH_TYPE_SERIAL;
else
@@ -195,8 +232,17 @@ int __init bcm63xx_flash_register(void)
@@ -195,8 +232,14 @@ int __init bcm63xx_flash_register(void)
return platform_device_register(&mtd_dev);
case BCM63XX_FLASH_TYPE_SERIAL:
@ -107,9 +107,6 @@ Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
+ bcm63xx_spi_flash_info[0].mode = SPI_RX_DUAL;
+ }
+
+ if (BCMCPU_IS_6358() || BCMCPU_IS_6368())
+ bcm63xx_flash_data.max_transfer_len = SPI_6358_MSG_DATA_SIZE;
+
+ return spi_register_board_info(bcm63xx_spi_flash_info,
+ ARRAY_SIZE(bcm63xx_spi_flash_info));
case BCM63XX_FLASH_TYPE_NAND:

12
target/linux/brcm63xx/patches-4.4/414-MTD-m25p80-allow-passing-pp_data.patch
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@ -10,7 +10,7 @@ Subject: [PATCH 64/79] MTD: m25p80: allow passing pp_data
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -276,7 +276,8 @@ static int m25p_probe(struct spi_device
@@ -261,7 +261,8 @@ static int m25p_probe(struct spi_device
return ret;
return mtd_device_parse_register(&nor->mtd,
@ -28,13 +28,13 @@ Subject: [PATCH 64/79] MTD: m25p80: allow passing pp_data
* partitioning
+ * @pp_data: optional partition parser data.
*
* @max_transfer_len: option maximum read/write length limitation for
* SPI controllers not able to transfer any length commands.
@@ -30,6 +31,7 @@ struct flash_platform_data {
* Board init code (in arch/.../mach-xxx/board-yyy.c files) can
* provide information about SPI flash parts (such as DataFlash) to
@@ -28,6 +29,7 @@ struct flash_platform_data {
char *type;
const char **part_probe_types;
+ struct mtd_part_parser_data *pp_data;
unsigned int max_transfer_len;
/* we'll likely add more ... use JEDEC IDs, etc */
};

2
target/linux/brcm63xx/patches-4.4/415-MIPS-BCM63XX-export-the-attached-flash-type.patch
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@ -11,7 +11,7 @@ Signed-off-by: Jonas Gorski <jogo@openwrt.org>
--- a/arch/mips/bcm63xx/dev-flash.c
+++ b/arch/mips/bcm63xx/dev-flash.c
@@ -252,3 +252,8 @@ int __init bcm63xx_flash_register(void)
@@ -249,3 +249,8 @@ int __init bcm63xx_flash_register(void)
return -ENODEV;
}
}

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