[U-Boot] [PATCH 3/3] nds32: asm/io.h: add __iormb and __iowmb support

[Marek Vasut <marek.vasut@gmail.com>]

> Hi Marek,
> 
> > 2011/10/24 Marek Vasut <marek.vasut@gmail.com>
> > 
> >> Hi,
> >> 
> >> can you possibly implement those as inline functions ? It'd be also
> >> great if you could convert the other macros to inline functions.
> >> 
> >> Thanks!
> 
> I've found there are some different data type warning occur when I'm
> translating inline function
> since all the driver originately call write and read marco.
> 
> Most of them is easy to deal with sicne the address is usually a
> 32-bit address "unsigned int *".
> However, the driver/serial/ns16550.c used readb/writeb but the
> "address" passed in ns16550.c is
> byte-wised (unsigned char *).

Well please fix. You can send a cleanup series?

> 
> And there are also address casted in (ulong) in ns16550.c.
> serial_out(UART_LCR_BKSE | UART_LCRVAL, (ulong)&com_port->lcr);
> I'm not sure to fix this way would affect ns16550 in other architecutre?.
> #define serial_out(x, y)       writeb(x, (unsigned int *)y)

This is definitelly wrong. I'd like to see others comment on this one.
> 
> And there are also problems when translating readb from macro to
> inline function.

Why?

> Some driver cannot be compiled with a return value inside the readb.
> I think I can post the fix of writeb for NDS32 architecture and see if
> you give some comments
> then I do for other architecture later.
> 
> Hi Wolfgang,
> Could you please pickup these 2 patches since it was independent to
> r/w inline functions?
> I'm not sure if the merge windows has been closed.
> Or should I pick these 2 patches into nds32 repo?
> 
> nds32: Use getenv_ulong() in place of getenv(), strtoul
> http://patchwork.ozlabs.org/patch/121312/
> 
> nds32: cache: define ARCH_DMA_MINALIGN for DMA buffer alignment
> http://patchwork.ozlabs.org/patch/121313/
> 
> Thanks!