netdev - Re: [patch 1/6] pasemi_mac: Move RX/TX section enablement to dma

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Date:	Tue, 26 Feb 2008 22:46:06 +1100
From:	Michael Ellerman <michael@...erman.id.au>
To:	Olof Johansson <olof@...om.net>
Cc:	jgarzik@...ox.com, netdev@...r.kernel.org, pasemi-linux@...abs.org,
	linuxppc-dev@...abs.org
Subject: Re: [patch 1/6] pasemi_mac: Move RX/TX section enablement to
	dma_lib

On Wed, 2008-02-20 at 20:57 -0600, Olof Johansson wrote:
> plain text document attachment (in-progress)
> Also stop both rx and tx sections before changing the configuration of
> the dma device during init.
> 
> Signed-off-by: Olof Johansson <olof@...om.net>
> 
> Index: k.org/arch/powerpc/platforms/pasemi/dma_lib.c
> ===================================================================
> --- k.org.orig/arch/powerpc/platforms/pasemi/dma_lib.c
> +++ k.org/arch/powerpc/platforms/pasemi/dma_lib.c
> @@ -478,6 +478,30 @@ int pasemi_dma_init(void)
>  	for (i = 0; i < MAX_RXCH; i++)
>  		__set_bit(i, rxch_free);
>  
> +	i = 1000;
> +	pasemi_write_dma_reg(PAS_DMA_COM_RXCMD, 0);
> +	while ((i > 0) && (pasemi_read_dma_reg(PAS_DMA_COM_RXSTA) & 1))
> +		i--;
> +	if (i < 0)
> +		printk(KERN_INFO "Warning: Could not disable RX section\n");
> +
> +	i = 1000;
> +	pasemi_write_dma_reg(PAS_DMA_COM_TXCMD, 0);
> +	while ((i > 0) && (pasemi_read_dma_reg(PAS_DMA_COM_TXSTA) & 1))
> +		i--;

This kind of caught my eye, is it still going to work when the next core
is twice as fast?

cheers

-- 
Michael Ellerman
OzLabs, IBM Australia Development Lab

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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