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Date:	Thu, 12 Aug 2010 09:42:27 +0800
From:	"Wang, Qi" <qi.wang@...el.com>
To:	Daniel Baluta <daniel.baluta@...il.com>,
	Masayuki Ohtak <masa-korg@....okisemi.com>
CC:	"meego-dev@...go.com" <meego-dev@...go.com>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	"socketcan-core@...ts.berlios.de" <socketcan-core@...ts.berlios.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Khor, Andrew Chih Howe" <andrew.chih.howe.khor@...el.com>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"Wang, Yong Y" <yong.y.wang@...el.com>
Subject: RE: [MeeGo-Dev][PATCH] Topcliff: Update PCH_CAN driver to 2.6.35

> -----Original Message-----
> From: Daniel Baluta [mailto:daniel.baluta@...il.com]
> Sent: Wednesday, August 11, 2010 6:37 PM
> To: Masayuki Ohtak
> Cc: meego-dev@...go.com; Wolfgang Grandegger;
> socketcan-core@...ts.berlios.de; netdev@...r.kernel.org; Khor, Andrew Chih
> Howe; gregkh@...e.de; arjan@...ux.intel.com; Wang, Qi; Wang, Yong Y
> Subject: Re: [MeeGo-Dev][PATCH] Topcliff: Update PCH_CAN driver to 2.6.35
> 
> Hi,
> 
> 2010/8/11 Masayuki Ohtak <masa-korg@....okisemi.com>:
> > CAN driver of Topcliff PCH
> >
> > Topcliff PCH is the platform controller hub that is going to be used in
> > Intel's upcoming general embedded platform. All IO peripherals in
> > Topcliff PCH are actually devices sitting on AMBA bus.
> > Topcliff PCH has CAN I/F. This driver enables CAN function.
> >
> > Signed-off-by: Masayuki Ohtake <masa-korg@....okisemi.com>
> 
> I have a few questions:
> 
> 1. Is your code based on Intel's CAN EP80579 ([1]) ?
No.
> 2. Why don't you use kernel existing kfifo infrastructure? ([2]).
Just take a look at kfifo.h. This structure has been changed. I remembered there was a spin_lock from kfifo previously. Currently it's been removed, good.
OKI-sans, would you please take a look at ./include/linux/kfifo.h, and try to use this structure and APIs?

Daniel,

We're anxious to integrate those codes now. Perhaps it'll take us quite a long time to use kfifo. How about implementing it with the next version?

Best Regards,
Qi.

> 3. Can you provide a pointer to Topcliff PCH CAN I/F datasheet ?
Currently this datasheet isn't open.
> 
> thanks,
> Daniel.
> 
> [1] http://www.intel.com/design/intarch/ep80579/sw_tools.htm
> [2] http://lxr.linux.no/#linux+v2.6.35/kernel/kfifo.c

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