Add support for the Marvell Atlantic 2 (AQC113/114/115/116) controllers,
a new chip generation that is not register-compatible with the Atlantic 1
parts aq(4) supports today. Adapted from the OpenBSD/NetBSD if_aq driver.
Register and device definitions (aq2_hw.h): the firmware handshake
(MIF_BOOT / MCP_HOST_REQ_INT / MIF_HOST_FINISHED), the 0x12000/0x13000
firmware interface windows, and the action-resolver table (ART) that
replaces Atlantic 1's discrete RX filters, plus the Atlantic 2 PCI device
ids and the aq_is_atlantic2() helper. Reserve a chip-feature bit
(AQ_HW_CHIP_ATLANTIC2) and add the aq_hw fields the firmware fills at boot
(ART base index, statistics interface version A0/B0). The per-VLAN-filter
resolver-tag field comes from the Linux driver; the BSD sources never
write it.
Firmware operations (aq_fwa2.c): Atlantic 2 talks to the management CPU
through the 0x12000/0x13000 register windows plus the boot handshake,
rather than Atlantic 1's mailbox in shared RAM. Implement that as a third
aq_firmware_ops vtable (reset, set_mode, get_mode, get_mac_addr,
get_stats); aq_fwa2_reboot() boots the firmware, selects the A2 ops, and
reads the version and ART base index, failing fast on the
crash-init / boot-failed bits. fwa2_set_mode advertises full duplex only
(the media model exposes no half-duplex types) and writes and acks the
link options before raising ACTIVE mode, so a forced media change does not
begin negotiation with a stale rate mask. enum aq_fw_link_speed gains
aq_fw_10M, which Atlantic 2 supports and Atlantic 1 does not.
Probe and attach: list the device ids with their media types and link
speeds (all copper; AQC113* up to 10G, AQC116C to 1G), populate
hw->device_id, and tag the generation with AQ_HW_CHIP_ATLANTIC2 so
IS_CHIP_FEATURE() recognises it uniformly. Branch firmware bring-up and
reset on the generation: aq_hw_init_ucp() and aq_hw_reset() reboot the MCP
instead of the Atlantic 1 RBL/FLB reset -- without a real datapath reset
every stop/init cycle reprograms the rings on a live, desynced RX DMA
engine and the receive path stays dead. aq_hw_init() programs the
Atlantic 2 launch-time clock ratio in place of the Atlantic 1
MRRS / TX-DMA request-limit clamp. Add an AQ_LINK_10M capability bit
(Atlantic 2 links at 10M, Atlantic 1 cannot), offer 10baseT media, and map
IFM_10_T to aq_fw_10M.
With every supported media type now present, replace the per-speed switch
statements in aq_media.c with a single {link bit, fw rate, IFM_* subtype,
Mbit/s} table -- one source of truth for the supported link speeds.
With this an Atlantic 2 card probes, brings up its firmware, reads its
MAC, and negotiates link; the RX action-resolver datapath comes next.