netdev - Re: [PATCH v4 05/10] net/fec: add dual fec support for mx28

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Message-ID: <4D2C4BEC.1030003@snapgear.com>
Date:	Tue, 11 Jan 2011 22:24:12 +1000
From:	Greg Ungerer <gerg@...pgear.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
CC:	Shawn Guo <shawn.guo@...escale.com>, <B32542@...escale.com>,
	<netdev@...r.kernel.org>, <u.kleine-koenig@...gutronix.de>,
	<jamie@...reable.org>, <baruch@...s.co.il>,
	<w.sang@...gutronix.de>, <r64343@...escale.com>, <eric@...rea.com>,
	<bryan.wu@...onical.com>, <jamie@...ieiles.com>,
	<davem@...emloft.net>, <linux-arm-kernel@...ts.infradead.org>,
	<lw@...o-electronics.de>
Subject: Re: [PATCH v4 05/10] net/fec: add dual fec support for mx28

On 11/01/11 20:27, Sascha Hauer wrote:
> On Thu, Jan 06, 2011 at 03:13:13PM +0800, Shawn Guo wrote:
>> This patch is to add mx28 dual fec support. Here are some key notes
>> for mx28 fec controller.
>>
>>   - The mx28 fec controller naming ENET-MAC is a different IP from FEC
>>     used on other i.mx variants.  But they are basically compatible
>>     on software interface, so it's possible to share the same driver.
>>   - ENET-MAC design on mx28 made an improper assumption that it runs
>>     on a big-endian system. As the result, driver has to swap every
>>     frame going to and coming from the controller.
>>   - The external phys can only be configured by fec0, which means fec1
>>     can not work independently and both phys need to be configured by
>>     mii_bus attached on fec0.
>>   - ENET-MAC reset will get mac address registers reset too.
>>   - ENET-MAC MII/RMII mode and 10M/100M speed are configured
>>     differently FEC.
>>   - ETHER_EN bit must be set to get ENET-MAC interrupt work.
>>
>> Signed-off-by: Shawn Guo<shawn.guo@...escale.com>
>> ---
>> Changes for v4:
>>   - Use #ifndef CONFIG_ARM to include ColdFire header files
>>   - Define quirk bits in id_entry.driver_data to handle controller
>>     difference, which is more scalable than using device name
>>   - Define fec0_mii_bus as a static function in fec_enet_mii_init
>>     to fold the mii_bus instance attached on fec0
>>   - Use cpu_to_be32 over __swab32 in function swap_buffer
>>
>> Changes for v3:
>>   - Move v2 changes into patch #3
>>   - Use device name to check if it's running on ENET-MAC
>>
>>   drivers/net/Kconfig |    7 ++-
>>   drivers/net/fec.c   |  148 +++++++++++++++++++++++++++++++++++++++++++++------
>>   drivers/net/fec.h   |    5 +-
>>   3 files changed, 139 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
>> index 4f1755b..f34629b 100644
>> --- a/drivers/net/Kconfig
>> +++ b/drivers/net/Kconfig
>> @@ -1944,18 +1944,19 @@ config 68360_ENET
>>   config FEC
>>   	bool "FEC ethernet controller (of ColdFire and some i.MX CPUs)"
>>   	depends on M523x || M527x || M5272 || M528x || M520x || M532x || \
>> -		MACH_MX27 || ARCH_MX35 || ARCH_MX25 || ARCH_MX5
>> +		MACH_MX27 || ARCH_MX35 || ARCH_MX25 || ARCH_MX5 || SOC_IMX28
>>   	select PHYLIB
>>   	help
>>   	  Say Y here if you want to use the built-in 10/100 Fast ethernet
>>   	  controller on some Motorola ColdFire and Freescale i.MX processors.
>>
>>   config FEC2
>> -	bool "Second FEC ethernet controller (on some ColdFire CPUs)"
>> +	bool "Second FEC ethernet controller"
>>   	depends on FEC
>>   	help
>>   	  Say Y here if you want to use the second built-in 10/100 Fast
>> -	  ethernet controller on some Motorola ColdFire processors.
>> +	  ethernet controller on some Motorola ColdFire and Freescale
>> +	  i.MX processors.
>
> This option is used nowhere and should be removed. Certainly it does not
> have the effect of enabling the second ethernet controller.

It does for a ColdFire platform...

grep -r CONFIG_FEC2 *

arch/m68knommu/configs/m5275evb_defconfig:CONFIG_FEC2=y
arch/m68knommu/platform/527x/config.c:#ifdef CONFIG_FEC2
arch/m68knommu/platform/527x/config.c:#ifdef CONFIG_FEC2

Regards
Greg


------------------------------------------------------------------------
Greg Ungerer  --  Principal Engineer        EMAIL:     gerg@...pgear.com
SnapGear Group, McAfee                      PHONE:       +61 7 3435 2888
8 Gardner Close,                            FAX:         +61 7 3891 3630
Milton, QLD, 4064, Australia                WEB: http://www.SnapGear.com
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