how to use ioremap() api from user space to read and write registers on SPI Flash memory in uClinux

Question

I am writing one sample application which is used to read registers and write particular value on given SPI Device address.

I am using altera spi 1.0 driver and got base address as 0xE5002460 while registering spi device.

I want to read/write registers from SPI Flash from user space using ioremap call.

Is there any code snippet or any example about how to use ioremap function which can directly read value of registers from base address given without writing any specific driver for that?

Answer 1

@Ritesh, ioremap api is used in the kernel space to memory map the device/module for ex:SPI registers which returns virtual address. This address can be used only by ioread[8|16|32] and iowrite[8|16|32] api's to read or write to the spi registers. You can use mmap to map the SPI registers. Go through the link mmap slower than ioremap.