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Date:   Thu, 9 Mar 2017 10:09:02 +0100
From:   Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:     Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Alexandre Torgue <alexandre.torgue@...com>
CC:     <netdev@...r.kernel.org>, Viresh Kumar <vireshk@...nel.org>,
        Shiraz Hashim <shiraz.linux.kernel@...il.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: stmmac still supporting spear600 ?

Hello

We do not test stmmac on this spear board since many years
and I guess you have to provide parameters from the platform.
In fact, stmmac is recently tested with DT.
IIRC, the mac on spear600 could not have the HW cap register
so it is mandatory to provide all the right parameters and
configurations for this HW.

Regards
Peppe

On 3/9/2017 9:34 AM, Thomas Petazzoni wrote:
> Hello,
>
> I'm porting Linux to an old spear600 based platform, and therefore
> trying to use the stmmac driver on this SoC. Unfortunately, it doesn't
> work quite well and I'm wondering if the stmmac driver still properly
> supports the old version of the IP that is used in this SoC. I'm
> testing with v4.11-rc1.
>
> First, the logs:
>
> Linux version 4.11.0-rc1 (thomas@...te) (gcc version 5.4.0 20160609 (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.4) ) #18 Thu Mar 9 09:18:01 CET 2017
> [...]
> libphy: Fixed MDIO Bus: probed
> stmmaceth e0800000.ethernet: no reset control found
> stmmac - user ID: 0x10, Synopsys ID: 0x32
> stmmaceth e0800000.ethernet: Ring mode enabled
> stmmaceth e0800000.ethernet: DMA HW capability register supported
> stmmaceth e0800000.ethernet: Normal descriptors
> libphy: stmmac: probed
> stmmaceth e0800000.ethernet (unnamed net_device) (uninitialized): PHY ID 0007c0c4 at 31 IRQ POLL (stmmac-0:1f) active
> [...]
> # ifconfig eth0 192.168.1.89
> stmmaceth e0800000.ethernet eth0: device MAC address 00:30:d3:21:22:60
> Generic PHY stmmac-0:1f: attached PHY driver [Generic PHY] (mii_bus:phy_addr=stmmac-0:1f, irq=-1)
> stmmaceth e0800000.ethernet: Failed to reset the dma
> stmmaceth e0800000.ethernet eth0: stmmac_hw_setup: DMA engine initialization failed
> stmmaceth e0800000.ethernet eth0: stmmac_open: Hw setup failed
> ifconfig: SIOCSIFFLAGS: Device or resource busy
>
> So the reason why it fails to reset the DMA is because
> dwmac_dma_reset() sets bit DMA_BUS_MODE_SFT_RESET in register
> DMA_BUS_MODE and waits for this bit to clear, but that never happens.
>
> The reason why I'm not sure if this IP is still supported is because
> dwmac1000_get_hw_feature() reads the DMA_HW_FEATURE register (offset
> 0x00001058), and my spear600 datasheet doesn't mention this register at
> all.
>
> It is worth mentioning that:
>
>  - Ethernet is working fine under U-Boot (it's an old 2010.03 U-Boot
>    version, with a good number of patches), so I'm sure the HW is
>    working.
>
>  - Setting bit 1 in the DMA_BUS_MODE register from U-Boot also leaves
>    this bit set forever, it apparently never clears (unless my tests
>    were wrong, which is very possible).
>
> In terms of Device Tree, I'm simply using spear600.dtsi, and enabling
> the gmac node, nothing else.
>
> Has the stmmac driver been recently used/tested on spear600 ?
>
> Thanks,
>
> Thomas Petazzoni
>

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