Change in coreboot[master]: soc/intel/common: Add new IRQ module

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Tim Wawrzynczak.
Hello build bot (Jenkins), Furquan Shaikh, Patrick Georgi, Martin Roth, Duncan Laurie, Arthur Heymans, Aamir Bohra, Srinidhi N Kaushik, Patrick Rudolph,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/49408

to look at the new patch set (#7).

Change subject: soc/intel/common: Add new IRQ module
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soc/intel/common: Add new IRQ module

The Intel FSP provides a default set of IO-APIC IRQs for PCI devices, if
the DevIntConfigPtr UPD is not filled in. However, the FSP has a list of
rules that the input IRQ table must conform to:
1) One entry per slot/function
2) Functions using PIRQs must use IOxAPIC IRQs 16-23
3) Single-function devices must use INTA
4) Each slot must have consistent INTx<->PIRQy mappings
5) Some functions have special interrupt pin requirements
6) PCI Express RPs must be assigned in a special way (FIXED_INT_PIN)
7) Some functions require a unique IRQ number
8) PCI functions must avoid sharing an IRQ with a GPIO pad which routes its
   IRQ through IO-APIC.

Since the FSP has no visibility into the actual GPIOs used on the board
when GpioOverride is selected, IRQ conflicts can occur between PCI devices
and GPIOs. This patch gives SoC code the ability to generate a table of
PCI IRQs that will meet the FSPs rules and also not conflict with GPIO
IRQs.

BUG=b:171580862
TEST=Boot with patch series on volteer, verify IO-APIC IRQs in
`/proc/interrupts` match what is expected. No `GSI INT` or
`could not derive routing` messages seen in `dmesg` output.
Verified TPM, touchpad, touchscreen IRQs all function as expected.

Signed-off-by: Tim Wawrzynczak 
Change-Id: I0c22a08ce589fa80d0bb1e637422304a3af2045c
---
A src/soc/intel/common/block/include/intelblocks/irq.h
A src/soc/intel/common/block/irq/Kconfig
A src/soc/intel/common/block/irq/Makefile.inc
A src/soc/intel/common/block/irq/irq.c
4 files changed, 431 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/08/49408/7