Re: [PATCH] 3c59x: read current link status from phy
From: Bogdan Costescu (Bogdan.Costescu_at_iwr.uni-heidelberg.de)
Date: 09/09/05
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Date: Fri, 9 Sep 2005 12:10:04 +0200 (CEST) To: Andy Fleming <afleming@freescale.com>
On Thu, 8 Sep 2005, Andy Fleming wrote:
> The new PHY Layer (drivers/net/phy/*) can provide all these features
> for you without much difficulty, I suspect.
As pointed to be Andrew a few days ago, this driver supports a lot of
chips - for most of them the test hardware would be hard to come by
and the documentation even more. Unless you'd like to do it based on
"whoever is interested should cry loud"...
> The layer supports handling the interrupts for you, or (if it's
> shared with your controller's interrupt)
Yes, there is only one interrupt that for data transmission (both Tx
and Rx), statistics, errors and (for those chips that support it) link
state change.
> Is the cost of an extra read every minute really too high?
You probably didn't look at the code. The MII registers are not
exposed in the PCI space, they need to be accessed through a serial
protocol, such that each MII register read is in fact about 200 (in
total) of outw and inw/inl operations.
-- Bogdan Costescu IWR - Interdisziplinaeres Zentrum fuer Wissenschaftliches Rechnen Universitaet Heidelberg, INF 368, D-69120 Heidelberg, GERMANY Telephone: +49 6221 54 8869, Telefax: +49 6221 54 8868 E-mail: Bogdan.Costescu@IWR.Uni-Heidelberg.De - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
- Previous message: Douglas Gilbert: "[PATCH] permit READ DEFECT DATA in block/scsi_ioctl"
- In reply to: Andy Fleming: "Re: [PATCH] 3c59x: read current link status from phy"
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