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Date: Mon, 02 Apr 2007 11:21:16 +0200
From: Didier Kryn <kryn@in2p3.fr>
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To: Didier Kryn <kryn@in2p3.fr>
Subject: Re: Reading and writing from/to VME device
References: <821B2170E9E7F04FA38DF7EC21DE4871088C81DA@VCAEXCH01.hq.corp.viasat.com>	<460A3BBC.5060002@in2p3.fr>	<929bf310703290313o234a47f9gbf9c5083fc23e45e@mail.gmail.com>	<460CD765.2060905@in2p3.fr>
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Cc: Konstantin Boyanov <kkboyanov@gmail.com>, linuxppc-embedded@ozlabs.org
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Didier Kryn a =E9crit :
>     Konstantin, I reproduced your ioctl() problem with the attached=20
> program. The conclusion is that the only valid size and base parameters=
=20
> for A16 are windowSizeL=3D0x10000 and xlatedAddrL=3D0. This means the A=
16=20
> space can only be mapped as a whole. What you observed with =20
> xlatedAddrL=3D0x10100000 is that the ioctl(), gently masks the irreleva=
nt=20
> high order bits.
>
>     Best regards.
>     Didier
>  =20
    Oops! I forgot the attachment...

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 name="test148.c"
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 filename="test148.c"

#include <linux/stddef.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include "vmedrv.h"

#if !defined(offsetof)
/* maybe defined (if <linux/stddef.h> included indirectly) */
# define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif

int main(void)
{
   int vmepd, i;
   char *devname="/dev/vme/vme_out0";
   vmeOutWindowCfg_t a16d16 = {0,1,0,0,0,0x1000000,0,0,0,0,0,0,VME_SSTNONE,
                               VME_A16,VME_D16,VME_SCT,VME_SUPER,VME_DATA,0};
   unsigned size_max=0x10000;
   unsigned base, size;
   unsigned short *vmebus;


   vmepd = open(devname, O_RDWR);
   if(vmepd==-1)
     {
        perror(devname);
        return 1;
     }

   for( base=0 ;   (size = size_max - base) ;   base+=0x100 )
     {
        a16d16.xlatedAddrL = base;
        a16d16.windowSizeL = size;
        if(ioctl(vmepd, VME_IOCTL_SET_OUTBOUND, &a16d16))
          printf("ioctl failed for base %x, size %x: %s\n", base, size, strerror(errno));
        else
          printf("ioctl OK for base %x, size %x\n", base, size);
     }

   for( base=0, size=0x100 ;   size <= size_max ;  size+=0x100 )
     {
        a16d16.xlatedAddrL = base;
        a16d16.windowSizeL = size;
        if(ioctl(vmepd, VME_IOCTL_SET_OUTBOUND, &a16d16))
          printf("ioctl failed for base %x, size %x: %s\n", base, size, strerror(errno));
        else
          printf("ioctl OK for base %x, size %x\n", base, size);
     }

  close(vmepd);
}


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