MPC8240 EPIC Driver (Attached)

A while ago, I posted some questions on getting the OpenPIC driver working
correctly for the EPIC (Embedded Programmable Interrupt Controller) internal
to the MPC8240. After several attempts on open_pic.*, I gave up, and ported a
an existing driver.

The attached files function as an interrupt driver for MPC8240 (PPC603)
systems with the internal EPIC operating in discrete mode. In this mode,
IRQ's are connected to the MPC8240 EPIC and the 8259 cascade function
is not needed. Typically, one or more PCI devices will use one of IRQ X (0-5)
on the MPC8240 EPIC, these interrupts will be received as EPIC_VECTOR_XX
and perform the EPIC EOI handling. Interrupts can be nested, such that higher
priority interrupts are not blocked out. For more information, see the Motorola
MPC8240 Users Manual, Chapter 11, Embedded Programmable Interrupt Controller.
Also, although I have not checked, I am pretty sure the same logic is in the
MPC8245.

If anyone has improvements or suggestions on how to improve this driver,
please email me directly.


					Thanks,
					-James