I.MX35 IIM SCS register

maxvankessel — Tue, 17 Sep 2013 22:03:19 GMT

I'm trying to read a byte from register IIMSCS2,

But every time I try the kernel get stuck.

Other registers like IIMSREV are readable but I can't read IIMSCS0 to IIMSCS3

I'm using Linux 3.2 on a I.MX35 and some hardware bits are signed in this register.

Code:

u8 rev = (__raw_readb(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSCS2))) & 0x7F;

I got a succesfull result in previous kernel 2.6.28 and 2.6.31.

With this code:

unsigned char *iim_base;

unsigned char reg;

iim_base = ioremap(IIM_BASE_ADDR, SZ_4K);

reg = *(iim_base + IIM_SCS2_OFFSET);

iounmap(iim_base);

u8 rev = reg & IIM_SCS_DATA_MASK; // 0x7F

Also this piece of code ain't working for kernel 3.2

Can someone explain this?

Re: I.MX35 IIM SCS register

maxvankessel — Mon, 14 Oct 2013 11:37:22 GMT

Problem is resolved in further Linux versions.

3.11.1 is one of these working kernels