Hi Brian, On Tuesday 26 November 2013 01:04 PM, Sourav Poddar wrote:
The patch series aims to add memory mapped support for TI qspi contoller and also add support for the same in serial flash driver(m25p80). These feature was added as a part of the series[1]: The series[1] add support for quad and memory mapped feature in spi and flash driver. Based on Brian Norris suggestion on splitting the quad and memory mapped feature, I had sent a seperate series for quad support which has beed accepted by Brian. The $subject patch series takes care of the memory mapped part. Overview of memory mapped support in qspi: TI qspi controller supports memory mapped read support, switching to which requires register modifications(qspi registers, control module register for DRA, qspi register for am43x). Once switched, the flash data can be available at a soc specific memory mapped address. For operations in normal mode, we need to keep memory mapped disable. Flow of the patch is to keep the memory mapped enable by default in the driver. Whenever Normal spi mode operations are desired, we switch to configuration mode and at the end of it memory mapped is again enabled. There are few function pointers added to fecilitate easy communication between the flash and spi controllers. Major changes in the $subject patch based on discussion in [1]: - Feature has been broken down into small meaningfl patches. - memcpy is done in flash driver and spi framework is bypassed. - configuration of memory mapped spi controller regsiters is done through function calls from flash side. [1]: http://lists.infradead.org/pipermail/linux-mtd/2013-October/049058.html Tested on DRA7 board with spansion S25FL256S flash along with some internal irq crossbar patches. Tested on AM437x epos evm with macronix MX66l51235l flash. Testing done: -Erase the whole flash. -write to the flash -read back the flash - compare the data Sourav Poddar (17): spi/spi.h: Add get_buf/put_buf support in spi master.. spi/spi.h: Add configure from slave support. spi/qspi: parse register by name. spi/qspi: parse control module register. spi/qspi: parse memory map register. spi/qspi: Add support to switc to memory mapped operation. spi/qspi: configure set up register for memory map.. spi/qspi: Add api for get_buf/put_buf. spi/spi.h: Add "mem" variable in spi master. spi/spi.h: Add mmap flag in spi master. spi/qspi: set "mmap" flag to true. spi/qspi: convert driver to enable/disable memory mapped.. drivers: mtd: m25p80: Add api to configure master register . drivers: mtd: m25p80: Adapt driver to support memory mapped read. arm: dts: dra7: Add qspi device. arm: dts: am43x-epos: Add qspi device. Documentation: bindings: ti-qspi: update binding information. Documentation/devicetree/bindings/spi/ti_qspi.txt | 2 + arch/arm/boot/dts/am4372.dtsi | 12 ++ arch/arm/boot/dts/am43x-epos-evm.dts | 28 +++++ arch/arm/boot/dts/dra7-evm.dts | 32 ++++++ arch/arm/boot/dts/dra7.dtsi | 13 +++ drivers/mtd/devices/m25p80.c | 30 ++++++ drivers/spi/spi-ti-qspi.c | 115 ++++++++++++++++++++- include/linux/spi/spi.h | 16 +++ 8 files changed, 246 insertions(+), 2 deletions(-)
Gentle ping on this series on mtd side... -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
