[PATCH v5 0/5] Add memory mapped read support for ti-qspi
vigneshr at ti.com
Mon Dec 21 04:03:02 PST 2015
On 12/11/2015 09:39 AM, Vignesh R wrote:
> Changes since v4:
> Use syscon to access system control module register in ti-qspi driver.
> 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
Gentle Ping on the series...
> 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:
> 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 | 22 +++-
> arch/arm/boot/dts/am4372.dtsi | 4 +-
> arch/arm/boot/dts/dra7.dtsi | 6 +-
> drivers/mtd/devices/m25p80.c | 20 ++++
> drivers/spi/spi-ti-qspi.c | 139 +++++++++++++++++-----
> drivers/spi/spi.c | 45 +++++++
> include/linux/spi/spi.h | 41 +++++++
> 7 files changed, 243 insertions(+), 34 deletions(-)
More information about the linux-arm-kernel