Re: Tigon3 basic control over NIC Help!

On Fri, 30 Dec 2005 00:48:02 +0100, Jean-François Michaud"" <cometaj@xxxxxxxxxxx> wrote:

Hello,

I've been working on making my own OS and I have a Broadcom 570x NIC.
The Tigon3 driver does the trick for interfacing with my controller
under linux so I've been looking at the code trying to figure out how
to talk to the hardware, but I can't seem to see where or how to access
the NIC's hardware.

The best would be to find the specs for my hardware, but I can't seem
to get my hands on anything pertinent.

Could somebody point me in the right direction? It would save me an
awful lot of time.

Is it possible to access the device through ports directly, or do I
have to use the PCI bus?


I think I remember that the PCI bus is managed using ports.  The code use
pci functions that read and write the ports.  If I recall correctly, the devices
are mapped into the kernel address space, and the device registers are then
written and read using what looks like memory accesses.

A driver that I worked with a few years ago, had this fucntion used to access an
i2c bus on a video card:

  static inline void outlong(unsigned int dat)
  {
        *((unsigned int *) (voodoo->io_base + REG)) = dat;
  }

Most PCI devices use DMA for anything voluminous.

I am not trying to make anything generic. Something very crude and very
specific will do just fine.


That is OK.  Not having the technical data makes it hard.  You will have to persist
in examining the tigon driver, hand-stepping through the code to reach the parts that
do it.  Unless you already have, you should look at Rubini&Corbet's Linux Device Drivers
and read about dma transfer issues.  That will enable you to find your ways in the pci
code faster.

-Enrique
.

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