Device driver for Post Processor for ARM11 based SOC

Hello everyone, I was implementing a device driver for "Post Processor" (which is used for color space conversion and some scaling) peripheral on one of the ARM11 based SOC samsung s3c6410x. I have developed the basic skeleton for the driver and a test application. I am trying to write the output to a kernel buffer. But there seems to be some problem as no output is coming. The data flow is like -- 1) Taking the image raw file and writting it onto user space buffers. 2) Then writting it onto one kernel space buffer (say source_buffer). 3) Setting the necessary register settings for the peripheral and then writting the "source_buffer" address into peripheral DMA registers for source image (peripheral has a dedicated DMA); and another kernel buffer "destination_buffer" address into peripheral's DMA registers for destination image. 4) Then enabling the peripheral by setting its trigger bit. 5) Finally the writting the output from "destination_buffer" to another user space buffer. Please help Thanks in advance :)

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