[OpenWrt-Devel] [PATCH 00/22] Conversion of ARMv4 Gemini to DT and multiplatform

[Hans Ulli Kroll]

HI Linus,

On Sat, 11 Feb 2017, Linus Walleij wrote:

> On Mon, Jan 30, 2017 at 5:35 PM, Hans Ulli Kroll
> <ulli.kroll at googlemail.com> wrote:
> > On Tue, 24 Jan 2017, Florian Fainelli wrote:
> >> On 01/24/2017 12:47 PM, Linus Walleij wrote:
> 
> >> >> This is a dual GMAC !
> >> >>
> >> >> They are two different base address for each GMAC and one shared
> >> >> base address for both of them.
> >> >> This is all in one address space which remaps the driver.
> >> >>
> >> >> And to make it worse two interrupt lines, one of them is also shared.
> >> >>
> >> >> Any ideas to "convert" this into DT ??
> >> >> Because I think it's impossible to split both GMAC interfaces ??
> >> >
> >> > Sounds odd.  Yeah hardware.h lists this:
> >> >
> >> > #define GEMINI_TOE_BASE         0x60000000
> >> > #define GEMINI_GMAC0_BASE       0x6000A000
> >> > #define GEMINI_GMAC1_BASE       0x6000E000
> >> >
> >> > I guess one approach is to make a driver handling all of it in one,
> >> > let it ioremap all regions and support one or two GMACs on the same
> >> > TOE. More complex solutions is to share the TOE using
> >> > syscons regmap mechanism but it looks cumbersome.
> >> >
> >> > {
> >> >    compatible = "cortina,genesis-gmac-ethernet";
> >> >    reg = <0x60000000 0xa000>, <0x6000a000 0x4000>, <0x6000e000 0x4000>;
> >> >    interrupts = <1 IRQ_TYPE_LEVEL_HIGH>, <2 IRQ_TYPE_LEVEL_HIGH>;
> >> > }
> >> >
> >> > Or something like that?
> >
> > For addresses, base is here, for both interfaces
> > #define GEMINI_TOE_BASE                 0x60000000
> > and now for each interface, offset to the above
> > code is from the headerfile of the openwrt driver.
> > #define TOE_GMAC_DMA_BASE(x)            (0x8000 + 0x4000 * (x))
> > #define TOE_GMAC_BASE(x)                (0xA000 + 0x4000 * (x))
> >
> > maybe some other registers to
> > #define TOE_NONTOE_QUE_HDR_BASE         0x2000
> > #define TOE_TOE_QUE_HDR_BASE            0x3000
> > #define TOE_V_BIT_BASE                  0x4000
> > #define TOE_A_BIT_BASE                  0x6000
> >
> > AFAICR
> > The TOE part was "invented" for the gigabit interface.
> > They need to speed up the NIC because without TCP offloading you will get
> > only fast ethernet speed on a gigabit NIC.
> 
> I was suspecting that this ethernet is related to the Faraday ethernet driver
> that was merged in drivers/net/ethernet/faraday since so many other
> Gemini parts seems to be coming essentially directly from Faraday.
> 
> I looked through the header files etc there but the registers seem quite
> different ... :/
> 
> Still it is using the same "GMAC" naming and I strongly suspect this is
> an older Faraday IP that should go into the same driver folder.
> 
> Cc:ing some Faraday and Andestech emails to see if we can get some
> clarity in this. It would be nice if someone could atleast say "oh it's this
> IP FTxxx from Faraday" so we know what to name it.
> 

I must look/seach for the nas2000 SDK, maybe this brings some light.

Greetings Hans Ulli Kroll
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