"ip link set wlp3s0 up" doesn't turn on wifi adapter

So I'm installing Arch on a MacBook Pro 8,2, and I've managed to wrangle EFI into booting everything just fine for me, and I'm trying to get wifi working.
I got the firmware and drivers installed for the Broadcom 43xx chip, and am loading the correct kernel modules.
So if I run
# ip link list
I get the following output (trimmed to relevant entry for brevity):
3: wlp3s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT qlen 1000
link/ether b8:8d:12:2b:ee:76 brd ff:ff:ff:ff:ff:ff
If I then run
# ip link set wlp3s0 up
and then ip link list again I get the following output:
3: wlp3s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT qlen 1000
link/ether b8:8d:12:2b:ee:76 brd ff:ff:ff:ff:ff:ff
As you can see the wifi adapter isn't going up at all.
The relevant output from dmesg appears to be:
[ 150.794688] IPv6: ADDRCONF(NETDEV_UP): wlp3s0: link is not ready

02:00.0 Ethernet controller [0200]: Broadcom Corporation NetXtreme BCM57765 Gigabit Ethernet PCIe [14e4:16b4] (rev 10)
Subsystem: Broadcom Corporation NetXtreme BCM57765 Gigabit Ethernet PCIe [14e4:16b4]
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at a0400000 (64-bit, prefetchable) [size=64K]
Memory at a0410000 (64-bit, prefetchable) [size=64K]
Capabilities: [48] Power Management version 3
Capabilities: [58] MSI: Enable- Count=1/8 Maskable- 64bit+
Capabilities: [a0] MSI-X: Enable+ Count=6 Masked-
Capabilities: [ac] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [13c] Device Serial Number 00-00-3c-07-54-32-ac-6e
Capabilities: [150] Power Budgeting <?>
Capabilities: [160] Virtual Channel
Kernel driver in use: tg3
Kernel modules: tg3
02:00.1 SD Host controller [0805]: Broadcom Corporation NetXtreme BCM57765 Memory Card Reader [14e4:16bc] (rev 10) (prog-if 01)
Subsystem: Broadcom Corporation Device [14e4:0000]
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at a0420000 (64-bit, prefetchable) [size=64K]
Capabilities: [48] Power Management version 3
Capabilities: [58] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [ac] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [150] Power Budgeting <?>
Capabilities: [160] Virtual Channel
Kernel driver in use: sdhci-pci
Kernel modules: sdhci_pci
03:00.0 Network controller [0280]: Broadcom Corporation BCM4331 802.11a/b/g/n [14e4:4331] (rev 02)
Subsystem: Broadcom Corporation BCM4331 802.11a/b/g/n [14e4:4331]
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at a0600000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Capabilities: [58] Vendor Specific Information: Len=78 <?>
Capabilities: [48] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [d0] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [13c] Virtual Channel
Capabilities: [160] Device Serial Number 00-00-00-ff-ff-00-00-00
Capabilities: [16c] Power Budgeting <?>
Kernel driver in use: bcma-pci-bridge
Kernel modules: bcma

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