From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH net-next v2 8/9] Altera TSE: Add Miscellaneous Files for
 Altera Ethernet Driver
Date: Mon, 10 Mar 2014 17:40:31 -0700
Message-ID: <20140310174031.4145a3ff@nehalam.linuxnetplumber.net>
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To: Vince Bridgers <vbridgers2013@gmail.com>
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On Mon, 10 Mar 2014 18:14:36 -0500
Vince Bridgers <vbridgers2013@gmail.com> wrote:

> +
> +	buf[0] = (u64) ioread32(&mac->frames_transmitted_ok);

The cast to u64 is not really necessary, C will do it for you.
You do need the cast to do the shift for the 64 bit values.