Generic Interface (GENI) firmware based Qualcomm Universal Peripheral (QUP) Wrapper is a programmable module that is composed of multiple Serial Engines (SE) and can support various Serial Interfaces like UART, SPI, I2C, I3C, etc. This document provides a high level overview of the GENI based QUP Wrapper. Signed-off-by: Karthikeyan Ramasubramanian <kramasub@xxxxxxxxxxxxxx> --- Documentation/qcom-geni-se.txt | 56 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 Documentation/qcom-geni-se.txt diff --git a/Documentation/qcom-geni-se.txt b/Documentation/qcom-geni-se.txt new file mode 100644 index 0000000..dc517ef --- /dev/null +++ b/Documentation/qcom-geni-se.txt @@ -0,0 +1,56 @@ +Introduction +============ + +Generic Interface (GENI) Serial Engine (SE) Wrapper driver is introduced +to manage GENI firmware based Qualcomm Universal Peripheral (QUP) Wrapper +controller. QUP Wrapper is designed to support various serial bus protocols +like UART, SPI, I2C, I3C, etc. + +Hardware description +==================== + +GENI based QUP is a highly-flexible and programmable module for supporting +a wide range of serial interfaces like UART, SPI, I2C, I3C, etc. A single +QUP module can provide upto 8 Serial Interfaces, using its internal +Serial Engines. The actual configuration is determined by the target +platform configuration. The protocol supported by each interface is +determined by the firmware loaded to the Serial Engine. Each SE consists +of a DMA Engine and GENI sub modules which enable Serial Engines to +support FIFO and DMA modes of operation. + +:: + + +-----------------------------------------+ + |QUP Wrapper | + | +----------------------------+ | + --QUP & SE Clocks--> | Serial Engine N | +-IO------> + | | ... | | Interface + <---Clock Perf.----+ +----+-----------------------+ | | + State Interface | | Serial Engine 1 | | | + | | | | | + | | | | | + <--------AHB-------> | | | | + | | +----+ | + | | | | + | | | | + <------SE IRQ------+ +----------------------------+ | + | | + +-----------------------------------------+ + + Figure 1: GENI based QUP Wrapper + +Software description +==================== + +GENI SE Wrapper driver is structured into 2 parts: + +geni_se_device represents QUP Wrapper controller. This part of the driver +manages QUP Wrapper information such as hardware version, clock +performance table that is common to all the internal Serial Engines. + +geni_se_rsc represents Serial Engine. This part of the driver manages +Serial Engine information such as clocks, pinctrl states, containing QUP +Wrapper. This part of driver also supports operations(eg. initialize the +concerned Serial Engine, select between FIFO and DMA mode of operation etc.) +that are common to all the Serial Engines and are independent of Serial +Interfaces. -- Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
