Re: [linuxdc-dev]Misbehaving driver code

[Adrian M. <ad...@mc...>]

On Friday 23 Nov 2001 5:13 am, M. R. Brown wrote:
> * Adrian McMenamin <ad...@mc...> on Thu, Nov 22, 2001:
> > The good news is that I am now pretty confident that this task (writing
> > the driver) is doable...
>
> Two things about directly accessing the AICA hardware:
>
> 1) Use io_request_region() to reserve AICA registers and RAM,
> 2) Use the in{b,w,l}() out{b,w,l}() macros when accessing registers.  This
>    lets us do things like wait for the G2 bus FIFO (0xa05f688c) and other
>    cool stuff, without the device driver ever needing to worry about it:
>
>    void outl(u32 val, void *addr)
>    {
>    	while ((u32 *)*(0xa05f688c) & 1) ;
> 	*reg = val;
>    }
>
> You only have to worry about AICA-specific stuff in your driver at this
> point, you don't have to get all funky like libdream or KOS.
>

Thanks for the tips. No need to worry about the driver getting "all funky" 
:-> At the moment the thing I am interested in is getting some noise to come 
out of the speakers!


> See, even the kernel can do sane abstraction ;).
>
> M. R.