On Thu, Feb 17, 2011 at 01:05:03PM -0800, David Miller wrote: > From: Sam Ravnborg <sam@xxxxxxxxxxxx> > Date: Thu, 17 Feb 2011 21:57:48 +0100 > > > I'm trying to understand how we deal with floppy irq on sparc64. > > > > In arch/sparc/include/asm/floppy_64.h we have: > > > > error = request_irq(FLOPPY_IRQ, sparc_floppy_irq, > > IRQF_DISABLED, "floppy", NULL); > > > > FLOPPY_IRQ is set equal op->archdata.irqs[0] in sun_floppy_init(). > > So FLOPPY_IRQ is the platform irq - and not a virtual irq. > > The archdata IRQ is actually the computed virtual IRQ. > > This is the same as how we fetch the IRQ to use in other "OF" platform > drivers. > > Look at drivers/net/sunhme.c's OF platform driver probing, it uses > of->archdata.irqs[0] as the IRQ. Obvious - now that you spell it out for me. For sparc32 I already in my tree call build_device_irq in of_device_32.c:__init scan_one_device(). So I just have to look up the platform_device for floppy in floppy_32.h and pick irq from that. If I look for "SUNW,fdtwo" it should work on my box at least. And I checked a few of the prtconfs you have in your git repositry - several boxes uses this. ss2 however name it "fd" - so I need to check for that too. Same for ipx. So I will look up "SUNW,fdtwo" + "fd" to find the platform_device for floppy. And in that platform_device I can find the already allocated irq. Sam -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
