>
> >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.
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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