brcm63xx: add linux 4.4 support

[openwrt.git] / target / linux / brcm63xx / patches-4.4 / 203-MTD-DEVICES-m25p80-add-support-for-limiting-reads.patch

diff --git a/target/linux/brcm63xx/patches-4.4/203-MTD-DEVICES-m25p80-add-support-for-limiting-reads.patch b/target/linux/brcm63xx/patches-4.4/203-MTD-DEVICES-m25p80-add-support-for-limiting-reads.patch
new file mode 100644 (file)
index 0000000..3877442
--- /dev/null
+++ b/target/linux/brcm63xx/patches-4.4/203-MTD-DEVICES-m25p80-add-support-for-limiting-reads.patch
@@ -0,0 +1,90 @@
+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;
+@@ -152,6 +153,29 @@ 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;
+@@ -223,6 +247,9 @@ 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 */
+ };
+