svn commit: r326454 - in head/sys: conf dev/bwn gnu/dev/bwn/phy_n modules/bwn modules/bwn_pci

[Kyle Evans]

On Dec 1, 2017 8:21 PM, "Landon J. Fuller" <landonf at freebsd.org> wrote:

Author: landonf
Date: Sat Dec  2 02:21:27 2017
New Revision: 326454
URL: https://svnweb.freebsd.org/changeset/base/326454

Log:
  Introduce bwn(4) support for the bhnd(4) bus.

  Currently, bwn(4) relies on the siba_bwn(4) bus driver to provide support
  for the on-chip SSB interconnect found in Broadcom's older PCI(e) Wi-Fi
  adapters. Non-PCI Wi-Fi adapters, as well as the newer BCMA interconnect
  found in post-2009 Broadcom Wi-Fi hardware, are not supported by
  siba_bwn(4).

  The bhnd(4) bus driver (also used by the FreeBSD/MIPS Broadcom port)
  provides a unified kernel interface to a superset of the hardware
supported
  by siba_bwn; by attaching bwn(4) via bhnd(4), we can support both modern
  PCI(e) Wi-Fi devices based on the BCMA backplane interconnect, as well as
  Broadcom MIPS WiSoCs that include a D11 MAC core directly attached to
their
  SSB or BCMA backplane.

  This diff introduces opt-in bwn(4) support for bhnd(4) by providing:

   - A small bwn(4) driver subclass, if_bwn_bhnd, that attaches via
     bhnd(4) instead of siba_bwn(4).
   - A bhndb(4)-based PCI host bridge driver, if_bwn_pci, that optionally
     probes at a higher priority than the siba_bwn(4) PCI driver.
   - A set of compatibility shims that perform translation of bwn(4)'s
     siba_bwn function calls into their bhnd(9) API equivalents when bwn(4)
     is attached via a bhnd(4) bus parent. When bwn(4) is attached via
     siba_bwn(4), all siba_bwn function calls are simply passed through to
     their original implementations.

  To test bwn(4) with bhnd(4), place the following lines in loader.conf(5):

    hw.bwn_pci.preferred="1"

    if_bwn_pci_load="YES
    bwn_v4_ucode_load="YES"
    bwn_v4_lp_ucode_load="YES"

  To verify that bwn(4) is using bhnd(4), you can check dmesg:

    bwn0: <Broadcom 802.11 MAC/PHY/Radio, rev 15> ... on bhnd0

  ... or devinfo(8):

  pcib2
    pci2
      bwn_pci0
        bhndb0
          bhnd0
            bwn0
            ...

  bwn(4)/bhnd(4) has been tested for regressions with most chipsets
currently
  supported by bwn(4), including:

    - BCM4312
    - BCM4318
    - BCM4321

  With minimal changes to the DMA code (not included in this commit), I was
  also able to test support for newer BCMA devices by bringing up basic
  working Wi-Fi on two previously unsupported, BCMA-based N-PHY chipsets:

    - BCM43224
    - BCM43225


Hi,

I'm pretty sure we've discussed this, but I don't recall to what detail
that was- I recall that the 4313 is BCMA, but does it have one of the PHYs
that we support already? If so, I'll happily test there.

Thanks,

Kyle Evans