linux-kernel - Re: [PATCH] x86_64: permit to configure ISA support also for x86

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Date:	Thu, 22 Sep 2011 08:43:20 +0200
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	SocketCAN Core Mailing List <socketcan-core@...ts.berlios.de>,
	Willy Lambert <lambert.willy@...il.com>, x86@...nel.org,
	Valdis.Kletnieks@...edu, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86_64: permit to configure ISA support also for x86_64
 systems

On 09/21/2011 11:24 AM, Arnd Bergmann wrote:
> On Wednesday 21 September 2011 10:33:10 Wolfgang Grandegger wrote:
>>
>>> Since most ISA drivers don't actually use isa_register_driver
>>> (for good or bad), how about changing the Kconfig entry for
>>> the ones you need to 'depends on ISA || PLAT_GRANDEGGER_PC104_ATOM'
>>> or similar?
>>
>> What should the PLAT_GRANDEGGER_PC104_ATOM be good for? If I replace
>> isa_register_driver() with platform_driver_register(), like the serial
>> 8250 driver does, HAS_IOMEM should be just fine. This would then also
>> avoid the 64-bit trouble expected with old ISA drivers (enabled via
>> ISA). Or have I missed something?
> 
> I was thinking of the drivers that are for ISA cards but don't actually
> use the isa_register_driver() function. If you have to change the driver
> to a platform driver, you are right.

OK, then I will finally convert the sja1000_isa driver to a platform
driver instead of allowing CONFIG_ISA for x86_64.

> The other point is that you are probably using inb/outb operations,
> which I'm trying to provide only on ISA/PCMCIA/PCI based systems in
> the future. Once I finish that work, you will also need to depend on
> HAS_IOPORT (which currently means something else).

OK, the sja1000_isa driver just uses memory mapped access.

Wolfgang.
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