Messages in this thread | | | Date | Fri, 14 May 2004 14:33:32 -0700 | From | Marc Singer <> | Subject | Re: arm-lh7a40x IDE support in 2.6.6 |
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On Fri, May 14, 2004 at 11:23:19PM +0200, Bartlomiej Zolnierkiewicz wrote: > On Friday 14 of May 2004 21:47, Marc Singer wrote: > > > > [ you used 'struct ide_hwif_s' in arch-lh7a40x/ide.h to workaround this > > > 8) ] > > struct hwif_s actually > > > Copied from elsewhere. > > superio.h, superio.c
I don't think I ever looked at that code.
> EEK, added to TODO > > > Listen. It is not my intention to be clever. All I want to do is get > > things working and to not break other people's code. I'm certain that > > most people are working with the same assumptions. Aside from some > > naive snippets I've see promulgated, the bulk of the kernel work I've > > see is sane given limited information. Certainly, once one > > understands a sybsystem completely then the quality rises. I hope > > you'll admit that the IDE code is overly intricate. > > With changes like this nobody will ever be able to understand > IDE subsystem completely. ;-)
I get the feeling that you're blaming me and others for making the IDE code a mess. Might I suggest that this isn't a very productive tack? The most helpful thing to do is to a) provide best-practice examples, and b) to include some documentation. I'm not talking about anything extensive, but statements like
"All references to linux/ide.h must reside in the ide tree."
Are pretty darn helpful.
> > > - you are setting IDE_NO_IRQ in ide_init_hwif_ports() which is used > > > in many places in generic IDE code - anybody wanting to understand > > > interactions with your code + generic code will have serious > > > problems (especially if knows _nothing_ about lpd7a40x) > > > > I don't know what you mean. I grep for that constant and found it > > nowhere except for ide-io.c and in my code. It doesn't take much to > > find the references. > > I'm talking about ide_init_hwif_ports() function.
Most of the ARM arch's use it. Perhaps all of them need a good once over.
> > What is it that you want changed? > > > > > - hwif->mmio is set to 2 but resource handling is missed > > > > Can you be more specific? Did you notice the comment? I didn't know > > what it was for, but I set it because I thought that that was the > > right way to go. > > > > Are you talking about reserving the address space? At the moment, > > Yes.
Easily done.
> > this is done in the arch setup. I can certainly move it to the IDE > > driver. > > OK > > > > > The OUTB breaks my interface because I don't really have byte-level > > > > access to the resgisters. So, is selectproc a pre-select procedure or > > > > should it be a substitute? > > > > > > pre-select but you can change it to be substitute if you need > > > (just remember to update all users if you decide to do this) > > > > I'll have to search the kernel to see what uses it. Maybe the better > > way would be to define a new select proc that *is* a substitute. > > Nope.
So then we break anyone who is using the selectproc as a pre-select proc? I don't understand what you mean here. There are several drivers that use this function. How do you propose that we provide both types of behavior with one entry point?
> > of the core code is fine. It is that core code that is necessary to > > make the test possible. > > Stuff in arch-lh7a40x/ide.h is really a driver code but > abuses subsystem code instead - that's my complain.
Right. We agree. I am talking about the core code. Not the ide code. The core is what supports the CPU.
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