Re: [ts-7000] how to write dac driver for ts7200

[Jim Jackson <>]

No idea what check_mem_region or request_mem_region are? You give code.
There is example code for doing memory based I/O on the files section of
this group, and Technologics give sample code.

This sort of has a look of x86 type code!

This app note maybe of use...

http://www.simtec.co.uk/appnotes/AN0014/


On Mon, 20 Aug 2007, chaisc97 wrote:

> when i try to write a dac driver there are some error, the source code
> is
>
>        static volatile unsigned char *Address=NULL;
>         unsigned long bankcfg = 0x1000ffe0;
>
>         error_io=check_mem_region(SMCBCR3,4);
>
>         if(error_io<0)
>         {
>                 return error_io;
>         }
>         request_mem_region(SMCBCR3,4,"smcbcr");
>
>         Address=(unsigned char *)ioremap(SMCBCR3,4);
>         printk("address=%x v_address=%x\n",SMCBCR3,Address);
>         outw(bankcfg,Address);
>
> the output is
>
> Using dac.o
> address=8008000c v_address=c604000c
> Unable to handle kernel paging request at virtual address 2604000c
> pgd = c43f4000
> [2604000c] *pgd=00000000, *pmd = 00000000
> Internal error: Oops: 805
> CPU: 0
> pc : [<c603c178>]    lr : [<c603c164>]    Not tainted
> sp : c16dbee0  ip : a0000013  fp : c16dbf10
> r10: 00189f80  r9 : c16da000  r8 : ffffffea
> r7 : 00000060  r6 : c5692000  r5 : c603c000  r4 : c603c4f0
> r3 : 0000ffe0  r2 : 2604000c  r1 : 00000000  r0 : 00000024
> Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  Segment user
> Control: C000317F  Table: 043F4000  DAC: 00000015
> Process busybox (pid: 90, stack limit = 0xc16da378)
> Stack: (0xc16dbee0 to 0xc16dc000)
> bee0: 00000000 c604000c 00000004 8008000c 1000ffe0 00000000 c5692000
> 00000060
> bf00: 00000000 c446aa40 c16dbf14 c0234b14 c603c0c0 00000003 c5692000
> c1690000
> bf20: c603e000 00000060 c0388d1c c603c060 00000578 00000000 00000000
> 00000000
> bf40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 00000000
> bf60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 00000000
> bf80: 00000000 00000030 00000578 00189f80 00000080 c02277ac c16da000
> 00000578
> bfa0: 7ffffe2c c0227580 00000578 00189f80 00900080 0017f3f8 00189f80
> 00000000
> bfc0: 00000030 00000578 00189f80 c603c000 0017f3f8 0008b0a0 00000578
> 7ffffe2c
> bfe0: 7fffda24 7fffda18 0006aecc 2ac3f130 60000010 00900080 00000a62
> 00000a64
> Backtrace: not available
> Code: e59f3044 e5933000 e0822003 e15b32b0 (e1c230b0)
> Segmentation fault
>
>


 
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