diff options
Diffstat (limited to 'target/linux/brcm63xx/patches-3.3/203-MTD-DEVICES-m25p80-add-support-for-limiting-reads.patch')
| -rw-r--r-- | target/linux/brcm63xx/patches-3.3/203-MTD-DEVICES-m25p80-add-support-for-limiting-reads.patch | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-3.3/203-MTD-DEVICES-m25p80-add-support-for-limiting-reads.patch b/target/linux/brcm63xx/patches-3.3/203-MTD-DEVICES-m25p80-add-support-for-limiting-reads.patch new file mode 100644 index 000000000..847b6959e --- /dev/null +++ b/target/linux/brcm63xx/patches-3.3/203-MTD-DEVICES-m25p80-add-support-for-limiting-reads.patch @@ -0,0 +1,92 @@ +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 +@@ -100,6 +100,7 @@ struct m25p { + u16 addr_width; + u8 erase_opcode; + u8 *command; ++ int max_transfer_len; + }; + + static inline struct m25p *mtd_to_m25p(struct mtd_info *mtd) +@@ -346,10 +347,9 @@ static int m25p80_erase(struct mtd_info + * Read an address range from the flash chip. The address range + * may be any size provided it is within the physical boundaries. + */ +-static int m25p80_read(struct mtd_info *mtd, loff_t from, size_t len, ++static int __m25p80_read(struct m25p *flash, loff_t from, size_t len, + size_t *retlen, u_char *buf) + { +- struct m25p *flash = mtd_to_m25p(mtd); + struct spi_transfer t[2]; + struct spi_message m; + +@@ -408,6 +408,28 @@ static int m25p80_read(struct mtd_info * + return 0; + } + ++static int m25p80_read(struct mtd_info *mtd, loff_t from, size_t len, ++ size_t *retlen, u_char *buf) ++{ ++ struct m25p *flash = mtd_to_m25p(mtd); ++ size_t off; ++ size_t read_len = flash->max_transfer_len; ++ size_t part_len; ++ int ret = 0; ++ ++ if (!read_len) ++ return __m25p80_read(flash, from, len, retlen, buf); ++ ++ *retlen = 0; ++ ++ for (off = 0; off < len && !ret; off += read_len) { ++ ret = __m25p80_read(flash, from + off, min(len - off, read_len), ++ &part_len, buf + off); ++ *retlen += part_len; ++ } ++ ++ return ret; ++} + /* + * Write an address range to the flash chip. Data must be written in + * FLASH_PAGESIZE chunks. The address range may be any size provided +@@ -897,6 +919,9 @@ static int __devinit m25p_probe(struct s + return -ENOMEM; + } + ++ if (data) ++ flash->max_transfer_len = data->max_transfer_len; ++ + flash->spi = spi; + mutex_init(&flash->lock); + dev_set_drvdata(&spi->dev, flash); +--- 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 */ + }; + |