On Thu, Apr 24, 2014 at 2:02 PM, Ley Foon Tan <lftan@xxxxxxxxxx> wrote:
> On Tue, Apr 22, 2014 at 9:59 PM, Arnd Bergmann <arnd@xxxxxxxx> wrote:
>> On Friday 18 April 2014, Ley Foon Tan wrote:
>>
>>> +
>>> +#include <asm/pgtable-bits.h>
>>> +
>>> +#define IO_SPACE_LIMIT 0xffffffff
>>
>> Please use 0xffff here, this should work for almost any PCI bus.
> Ah, CONFIG_PCI is not enable in nios2. So, I think IO_SPACE_LIMIT
> should set to 0.
>
>
>>> +
>>> +/* Use "Duff's Device" to unroll the loops. */
>>> +#define __IO_OUT_LOOP(a, b, l) \
>>> + do { \
>>> + if (l > 0) { \
>>> + int _n = (l + 7) / 8; \
>>> + switch (l % 8) { \
>>> + case 0: \
>>> + do { \
>>> + *a = *b++; \
>>
>> I would recommend just doing all of this in out-of-line implementations
>> rather than macros and inline functions.
> Okay. Will move the macros to out-of-line function.
I'm start working on this and found that it is better to keep it as
macros. This is because the input arguments "a" and "b" can be
byte/short/int pointers. Otherwise, we need to have separate function
calls for byte/short/int.
Regards
Ley Foon
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