Messages in this thread | | | From | Vignesh R <> | Subject | [PATCH v4 0/5] Add memory mapped read support for ti-qspi | Date | Mon, 30 Nov 2015 10:45:10 +0530 |
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Changes since v3: Rework to introduce spi_flash_read_message struct. Support different opcode/addr/data formats as per Brian's suggestion here: https://lkml.org/lkml/2015/11/11/454
Changes since v2: Remove mmap_lock_mutex. Optimize enable/disable of mmap mode.
Changes since v1: Introduce API in SPI core that MTD flash driver can call for mmap read instead of directly calling spi-master driver callback. This API makes sure that SPI core msg queue is locked during mmap transfers. v1: https://lkml.org/lkml/2015/9/4/103
Cover letter:
This patch series adds support for memory mapped read port of ti-qspi. ti-qspi has a special memory mapped port through which SPI flash memories can be accessed directly via SoC specific memory region.
First patch adds a method to pass flash specific information like read opcode, dummy bytes etc and to request mmap read. Second patch implements mmap read method in ti-qspi driver. Patch 3 adapts m25p80 to use mmap read method before trying normal SPI transfer. Patch 4 and 5 add memory map region DT entries for DRA7xx and AM43xx SoCs.
This patch series is based on the discussions here: http://www.spinics.net/lists/linux-spi/msg04796.html
Tested on DRA74 EVM and AM437x-SK. Read performance increases from ~100kB/s to ~2.5MB/s.
Vignesh R (5): spi: introduce accelerated read support for spi flash devices spi: spi-ti-qspi: add mmap mode read support mtd: devices: m25p80: add support for mmap read request ARM: dts: DRA7: add entry for qspi mmap region ARM: dts: AM4372: add entry for qspi mmap region
Documentation/devicetree/bindings/spi/ti_qspi.txt | 19 +++- arch/arm/boot/dts/am4372.dtsi | 4 +- arch/arm/boot/dts/dra7.dtsi | 7 +- drivers/mtd/devices/m25p80.c | 20 +++++ drivers/spi/spi-ti-qspi.c | 101 ++++++++++++++++++++-- drivers/spi/spi.c | 45 ++++++++++ include/linux/spi/spi.h | 41 +++++++++ 7 files changed, 225 insertions(+), 12 deletions(-)
-- 2.6.3
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