USB

There are two device-mode USB controllers (CHIPIDEA CI13410-A), which enable things like keyboard emulation and virtual media.

device	MMIO	IRQ
USB 2.0 ("High Speed") controller	0xb0005000	20
USB 1.1 ("Full Speed") controller	0xb0006000	21

System integration

The Dell driver touches the following registers outside of the USB controllers, during Full Speed initialization:

Early during initialization:

• select PLL1 through CLKSEL (bits 7:6 = 0x1)
• set bit 23 of MFSEL1, UINCSEL (USB 1.1 insertion control)
• clear bits 14:13 of INTCR, put UINC into high-impedance mode

Late during initialization:

• set bit 23 of MFSEL1, UINCSEL
• set bits 14:13 of INTCR, drive 1 on UINC

For the High Speed USB controller:

• SBUSCFG is set to 2

References

• Dell driver (FullSpeed part, header)
• mainline ChipIdea driver