> >
> > >I create a pci device which I want to interact with Linux for a user
> > >application. This pci device is a FPGA. I create a kernel module for
> > >communication kernel - user space and now I want to send settings
> > >information to this pci device.
> > >
> > >
> > >
> > Ive been looking for a PCI card with a user-programmable FPGA, tell us more.
> >
> > does it have a hardwired PCI interface (ie already in silicon)
> > if so, it should have a pci-config-space (64 bytes, i think), and
> > could be programmable thru that.
> >
> yes, I can't config it.
oups, i can config it, sorry :)
> The problem is to interact with the device. The FPGA do some calcul
> and I need to change some value (register) of the algo that it
> perform.
>
> Here a partial code :
>
> u32 io_addr;
> #define SLOPE_REGISTER 0x04
> ...
> pci_read_config_dword(dev, PCI_BASE_ADDRESS_0, &io_addr);
> ...
> if(PCI_BASE_ADDRESS_SPACE_IO& io_addr)
> {
> //here I want set a register
> u8 slope = 10;
> outb(slope , io_addr + SLOPE_REGISTER ); //can I do that ??
> }
>
> > >I need to use (I/O memory) to do that. But I don't how. I can't get
> > >the base address with pci_read_config and after that I am confuse.
> > >
> > yeah - something doesnt add up. Does it appear in /sys ?
> >
> > $> file /sys/bus/pci/devices/0000\:00\:00.0/config
> > /sys/bus/pci/devices/0000:00:00.0/config: data
> >
> > > I
> > >think I can use both function outb or writeb to send information but I
> > >don't know which is better.
> > >
> > >
> > >
> > Read LDD-3, both ch 3(chr-driver), 8-(mem) IIRC.
> >
> > The choice between them is basically ioport or iomem,
> > and I think its somewhat dicated by the processor.
> > x86 has a separate IO-addr-space so inb, outb just work,
> > 68k does not, so those boards must map IO ops into memory,
> > and U must use ioremap to tell the kernel where the IO-space is.
> >
> > But I dont have one of these, and U shouldnt just take my word for it.
> >
> > what kind of board are u using.
> >
> > >outb seem to be Intel specific and writeb need to map I/0 memory with ioremap
> > >
> > >
> > >
> > I think youve got ioremap usage backwards.
> > I have intel board, im using inb,outb, and have no ioremap,
> > and Im getting expected results.
> >
> > >Which method is more standard for a pci device (portable)?
> > >
> > >On 6/22/05, Christophe Lucas <clucas@xxxxxxxxxxxxx> wrote:
> > >
> > >
> > >>Eric Clément (clement.eric@xxxxxxxxx) wrote:
> > >>
> > >>
> > >>>Hi,
> > >>>
> > >>>I know the base address (I/O memory) of my device, but I don't know
> > >>>how to write information to the device.
> > >>>
> > >>>Which fonction shoud I use :
> > >>>
> > >>>outb, writeb or ... ?
> > >>>
> > >>>
> > >>I think you should use outb();
> > >>You can see how is declared writeb() for x86 :
> > >>
> > >> http://lxr.linux.no/source/include/asm-i386/io.h#L165
> > >>
> > >>But I think you should give more information to us to be able to help
> > >>you.
> > >>
> > >> - Christophe
> > >>
> > >>
> > >>
> > >
> > >--
> > >Kernelnewbies: Help each other learn about the Linux kernel.
> > >Archive: http://mail.nl.linux.org/kernelnewbies/
> > >FAQ: http://kernelnewbies.org/faq/
> > >
> > >
> > >
> >
> >
>
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