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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
Approved by: adrian (mentor, implicit)
Sponsored by: The FreeBSD Foundation & Plausible Labs
Differential Revision: https://reviews.freebsd.org/D13041
40 lines
1.1 KiB
Makefile
40 lines
1.1 KiB
Makefile
# $FreeBSD$
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.PATH: ${SRCTOP}/sys/dev/bwn
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KMOD= if_bwn
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SRCS= if_bwn.c if_bwnreg.h if_bwnvar.h
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SRCS+= if_bwn_siba.c if_bwn_bhnd.c if_bwn_siba_compat.c
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SRCS+= if_bwn_util.c
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# PHY
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SRCS+= if_bwn_phy_common.c
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SRCS+= if_bwn_phy_g.c if_bwn_phy_lp.c
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SRCS+= if_bwn_phy_n.c
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# BHND
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SRCS+= bhnd_bus_if.h \
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bhnd_chipc_if.h \
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bhnd_pmu_if.h \
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bhnd_pwrctl_if.h
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SRCS+= bhnd_nvram_map.h
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# Other
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SRCS+= device_if.h bus_if.h gpio_if.h pci_if.h opt_bwn.h opt_wlan.h
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# The following need the BWN_GPL_PHY kenrel option to opt-in
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# to the GPL'd 802.11n PHY support for this driver.
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.PATH: ${SRCTOP}/sys/gnu/dev/bwn/phy_n
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SRCS.BWN_GPL_PHY+= if_bwn_radio_2055.c
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SRCS.BWN_GPL_PHY+= if_bwn_radio_2056.c
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SRCS.BWN_GPL_PHY+= if_bwn_radio_2057.c
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SRCS.BWN_GPL_PHY+= if_bwn_phy_n_tables.c
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SRCS.BWN_GPL_PHY+= if_bwn_phy_n_ppr.c
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SRCS.BWN_GPL_PHY+= if_bwn_phy_n_core.c
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.include <bsd.kmod.mk>
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# XXX Work around clang warnings, until maintainer approves fix.
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CWARNFLAGS.if_bwn.c= ${NO_WSOMETIMES_UNINITIALIZED}
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CWARNFLAGS.if_bwn_phy_g.c= ${NO_WSOMETIMES_UNINITIALIZED} ${NO_WCONSTANT_CONVERSION}
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CWARNFLAGS.if_bwn_phy_lp.c= ${NO_WSOMETIMES_UNINITIALIZED}
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