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

["chaisc97" <>]

--- In  Jim Jackson <> wrote:
>
> 
> 
> 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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