I am trying to understand "kinda shared" interrupts. There are various interrupts in my not-yet-released CPU, and I have interrupt code that knows how to talk to them. So far so good. I also have an external interrupt controller that groups together 18 external interrupt sources and sends them in one CPU pin. This external controller has a register for enabling interrupts, and a register for status/acknowledge. Pretty standard.
The CPU code doesn't know about the external controller. It seems silly to rewrite the CPU-specific interrput code to accommodate this board-specific detail (besides then my code won't match Dale's). So I figure I tell the kernel I am doing shared interrupts. So where do I enable, disable, and acknowledge these external bits? Specifically, I am trying to get a couple of serial ports working. I can put conditional code in serial.c startup() to enable these interrupts, but how do I know which serial port? Add a conditionally compiled sub-IRQ number to serial_state structure? Is there a cleaner way? Thanks, -kb ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
