diff options
| author | Vipin Kumar <vipin.kumar@st.com> | 2012-03-14 10:17:17 +0400 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2012-03-27 04:00:14 +0400 |
| commit | 604e75444fa82cfdcba339e3bd4da1dfd6947539 (patch) | |
| tree | 44e3c2dd6ce4e9ef871ca5dd9f74fa197f655b2d /include/linux | |
| parent | 712c4add03277197168210bb628b8273e36adf76 (diff) | |
| download | linux-604e75444fa82cfdcba339e3bd4da1dfd6947539.tar.xz | |
mtd: nand/fsmc: Access the NAND device word by word whenever possible
The default way of accessing nand device is using the nand width. This means
that 8bit devices are using u8 * and 16bit devices are accessed using u16 *.
This results in a non-optimal performance since the FSMC is designed to
translate the normal word accesses into device width based accesses. This patch
implements read_buf and write_buf callbacks using word by word accesses.
Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Reviewed-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mtd/fsmc.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/mtd/fsmc.h b/include/linux/mtd/fsmc.h index c4ac07a19691..1edd2b3ac38e 100644 --- a/include/linux/mtd/fsmc.h +++ b/include/linux/mtd/fsmc.h @@ -141,6 +141,11 @@ struct fsmc_nand_timings { uint8_t tset; }; +enum access_mode { + USE_DMA_ACCESS = 1, + USE_WORD_ACCESS, +}; + /** * fsmc_nand_platform_data - platform specific NAND controller config * @partitions: partition table for the platform, use a default fallback @@ -164,6 +169,7 @@ struct fsmc_nand_platform_data { /* CLE, ALE offsets */ unsigned long cle_off; unsigned long ale_off; + enum access_mode mode; void (*select_bank)(uint32_t bank, uint32_t busw); }; |