Add dwc_otg_acpi

[val_packett.cool]

Summary

The Raspberry Pi 4 uses XHCI for all host USB ports, however the DWC OTG is still present and is now responsible for the Type-C port, always in device mode.

This adds support for it in ACPI mode. The code is based on dwc_otg_fdt, simplified (only one interrupt, always device mode).

ACPI table: https://github.com/tianocore/edk2-platforms/blob/2d07a49e45326a56354167061390deba526b3c70/Platform/RaspberryPi/AcpiTables/GpuDevs.asl#L13-L33

Test Plan

RPi:

dwcotg0: <DWC OTG 2.0 integrated USB controller> iomem 0xfe980000-0xfe98ffff irq 1 on acpi0
usbus1 on dwcotg0
usbus1: 480Mbps High Speed USB v2.0
ugen1.1: <DWCOTG OTG Root HUB> at usbus1
uhub1 on usbus1
uhub1: <DWCOTG OTG Root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus1
ugen1.2: <Unknown > at usbus1 (disconnected)
uhub_reattach_port: could not allocate new device
usb_alloc_device: setting up USB template failed - usb_template(4) not loaded?
# (seems to spam ^this^ a bit when I don't have a template specified — hopefully only when plugged into a computer, not a plain power supply :D)
ugen1.2: <The FreeBSD Project (https://www.FreeBSD.org) USB Ethernet Adapter> at usbus1
cdce0 on uhub1
cdce0: <USB Ethernet Comm Interface> on usbus1
ue0: <USB Ethernet> on cdce0

Host (MACCHIATObin):

[30260] ugen2.10: <The FreeBSD Project (https://www.FreeBSD.org) USB Ethernet Adapter> at usbus2
[30260] cdce0 on uhub3
[30260] cdce0: <USB Ethernet Comm Interface> on usbus2
[30260] ue1: <USB Ethernet> on cdce0

[val_packett.cool]

sys/dev/usb/controller/dwc_otg_acpi.c

4 ↗

(On Diff #72894)

(@hselasky ok to drop all rights reserved?)

[andrew]

sys/dev/usb/controller/dwc_otg_acpi.c

81 ↗

(On Diff #72894)

This indentation looks wrong

89 ↗

(On Diff #72894)

It looks like most of this could move to dwc_otg_init as it's common between the two existing callers and this.

195–197 ↗

(On Diff #72894)

The generic DEVMETHODs should move to the base class.

[val_packett.cool]

sys/dev/usb/controller/dwc_otg_acpi.c

89 ↗

(On Diff #72894)

It's interleaved with slightly different things (mode, irq rid) but I'll move everything below the sc_irq_res assignment, sure

195–197 ↗

(On Diff #72894)

There's no base class, dwc_otg only exports functions. I'm not sure it's worth creating just for three generic methods.

[• hselasky]

sys/dev/usb/controller/dwc_otg_acpi.c

4 ↗

(On Diff #72894)

Yes, no problem.

[val_packett.cool]

alright, moved the common things into the common init, and it even works (on acpi)