Date: Fri, 29 Apr 2005 15:17:11 +0530 From: Dipjyoti Saikia <dipjyoti.saikia@gmail.com> To: Cole <cole@opteqint.net> Cc: freebsd-hackers@freebsd.org Subject: Re: PCI Programming Message-ID: <dcbc809d05042902473b0b4599@mail.gmail.com> In-Reply-To: <000901c54c19$3dba2570$4206000a@deadmind> References: <000901c54c19$3dba2570$4206000a@deadmind>
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Hi,
The normal usage of pci_resource_start() in Linux is to get the base
address of the BAR for further reads/writes using inb/outb etc.
In Free BSD you can use the following :
bus_alloc_resource(); =20
rman_get_bustag();
rman_get_bushandle();
Usually the ret value of rman_get_bushandle() gives the starting
address of the resource (of the BAR for which you called
bus_alloc_resource) .
Normally we use bus_space_* api's to read/write in FreeBSD. The use of
bus_space_ functions need us to only specify the offset rather than
the Linux like usage
inb(base+offset) etc.
Thanks
Dip
On 4/28/05, Cole <cole@opteqint.net> wrote:
> Hey
>=20
> Im currently trying to port some linux pci driver to FreeBSD code. But im=
running into a problem. Its using a function that I cant
> seem to find the equivalent of for FreeBSD.
>=20
> Heres the function up to the point where im getting stuck.
>=20
> int FindDevice( void )
> {
>=20
> static struct pci_dev *pciptr;
> int pci_info_index =3D 0;
> U16 wDev;
> unsigned int tmp_addr;
>=20
> /*-----------------------------------------*/
> #ifdef CONFIG_PCI // find the specified device and its configuration
> if( pcibios_present() ){
>=20
> pci_for_each_dev( pciptr ){
> if ((pciptr->vendor =3D=3D VENDOR_ID) && \
> (pciptr->device =3D=3D DEVICE_ID) && \
> (pciptr->subsystem_vendor =3D=3D SUBSYSTEM_VID) && \
> (pciptr->subsystem_device =3D=3D SUBSYSTEM_DID) && \
> (PCI_FUNC(pciptr->devfn) =3D=3D 0) )
> {
> DevExtension[pci_info_index].wBus=3D pciptr->bus->numb=
er;
> DevExtension[pci_info_index].wDevFunc=3D pciptr->devfn=
;
> DevExtension[pci_info_index].wCard =3D pci_info_index;
> tmp_addr =3D pci_resource_start( pciptr, 4 );
> DevExtension[pci_info_index].func0_bar =3D (tmp_addr &=
~0x03);
>=20
> now the function im getting stuck at, is the "tmp_addr =3D pci_resource_s=
tart(pciptr, 4). I was wondering if anyone knows of an
> equivalent under FreeBSD. Or if there is a way to obtain that value with =
some other method in FreeBSD. I am pretty much fine up
> until that point.
>=20
> If anyone has any sample code or anything that I could read to proceed an=
y further, it would be greatly appreciated.
>=20
> Regards
> /Cole
>=20
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