2013/2/12 Benjamin Herrenschmidt <b...@kernel.crashing.org>:
> On Mon, 2013-02-11 at 16:57 +0100, Michal Simek wrote:
>> But it reminds me that maybe the easiest solution is not to use endian
>> accessors just use two simple macros which should work on all systems.
>>
>> #define <name>_readreg(offset) ({__raw_readl(offset); rmb(); })
>> #define <name>_writereg(offset, val) ({wmb(); __raw_writel(val, offset);
>> })
>>
>> which is probably the faster solution which add minimum additional code
>> to driver and can also remove endian detection code.
>
> Except that rmb & wmb might not be the right barriers for IOs ...
Arm is using __iormb in readX macros
#define __iormb() rmb()
but it is arm specific only that's why I have added there rmb().
Thanks,
Michal
--
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
