Rewrite the control_transfer function following Linux 7.1 ohci-q.c
PIPE_CONTROL pattern exactly:
· Dummy TD at ED tail (Linux: ed->hwTailP = dummy)
· TD chain via hwNextTD (Linux: td_fill model)
· Toggle sequence: DATA0 → DATA1 → DATA1
(Linux: TD_T_DATA0, TD_T_DATA1, TD_T_DATA1)
· DoneHead polling with zero-acknowledge
(Linux: hcca->done_head = 0)
· Kickstart via OHCI_CLF (Linux: cmdstatus write)
· hwBE = data + len - 1 (Linux: td->hwBE formula)
· Separate data buffer and output buffer parameters to avoid
borrow conflicts in the copy-back path
· Use MmioRegion (same as ehcid) for MMIO access
· Use usize::wrapping_add/sub for physical address arithmetic
Compiles cleanly (cargo check passes). Completes P0-B2 from
USB-IMPLEMENTATION-PLAN.md v2 — both UHCI and OHCI now have real
compiling drivers replacing the old 35-line stubs.
vasilito
5d0e41dff2