wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices

ath12k is a new mac80211 driver for Qualcomm Wi-Fi 7 devices, first
supporting QCN9274 and WCN7850 PCI devices.  QCN9274 supports both AP
and station; WCN7850 supports only station mode. Monitor mode is not
(yet) supported. Only PCI bus devices are supported.

ath12k is forked from an earlier version of ath11k. It was simpler to
have a "clean start" for the new generation and not try to share the
code with ath11k. This makes maintenance easier and avoids major
changes in ath11k, which would have significantly increased the risk
of regressions in existing setups.

ath12k uses le32 and cpu_to_le32() macros to handle endian
conversions, instead of using the firmware byte swap feature utilized
by ath11k. There is only one kernel module, named ath12k.ko.

Currently ath12k only supports HE mode (IEEE 802.11ax) or older, but
work is ongoing to add EHT mode (IEEE 802.11be) support.

The size of the driver is ~41 kLOC and 45 files. To make the review
easier, this initial version of ath12k does not support Device Tree,
debugfs or any other extra features. Those will be added later, after
ath12k is accepted to upstream.

The driver is build tested by Intel's kernel test robot with both GCC
and Clang. Sparse reports no warnings. The driver is mostly free of
checkpatch warnings, albeit few of the warnings are omitted on
purpose, list of them here:

https://github.com/qca/qca-swiss-army-knife/blob/master/tools/scripts/ath12k/ath12k-check#L52

The driver has had multiple authors who are listed in alphabetical
order below.

Co-developed-by: Balamurugan Selvarajan <[email protected]>
Signed-off-by: Balamurugan Selvarajan <[email protected]>
Co-developed-by: Baochen Qiang <[email protected]>
Signed-off-by: Baochen Qiang <[email protected]>
Co-developed-by: Bhagavathi Perumal S <[email protected]>
Signed-off-by: Bhagavathi Perumal S <[email protected]>
Co-developed-by: Carl Huang <[email protected]>
Signed-off-by: Carl Huang <[email protected]>
Co-developed-by: Jeff Johnson <[email protected]>
Signed-off-by: Jeff Johnson <[email protected]>
Co-developed-by: Karthikeyan Periyasamy <[email protected]>
Signed-off-by: Karthikeyan Periyasamy <[email protected]>
Co-developed-by: P Praneesh <[email protected]>
Signed-off-by: P Praneesh <[email protected]>
Co-developed-by: Pradeep Kumar Chitrapu <[email protected]>
Signed-off-by: Pradeep Kumar Chitrapu <[email protected]>
Co-developed-by: Ramya Gnanasekar <[email protected]>
Signed-off-by: Ramya Gnanasekar <[email protected]>
Co-developed-by: Sriram R <[email protected]>
Signed-off-by: Sriram R <[email protected]>
Co-developed-by: Vasanthakumar Thiagarajan <[email protected]>
Signed-off-by: Vasanthakumar Thiagarajan <[email protected]>
Co-developed-by: Wen Gong <[email protected]>
Signed-off-by: Wen Gong <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>

MAINTAINERS

@@ -16986,6 +16986,13 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git
 F:	Documentation/devicetree/bindings/net/wireless/qcom,ath11k.yaml
 F:	drivers/net/wireless/ath/ath11k/
 
+QUALCOMM ATH12K WIRELESS DRIVER
+M:	Kalle Valo <[email protected]>
+L:	[email protected]
+S:	Supported
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git
+F:	drivers/net/wireless/ath/ath12k/
+
 QUALCOMM ATHEROS ATH9K WIRELESS DRIVER
 M:	Toke Høiland-Jørgensen <[email protected]>
 L:	[email protected]

drivers/net/wireless/ath/Kconfig

@@ -63,5 +63,6 @@ source "drivers/net/wireless/ath/wil6210/Kconfig"
 source "drivers/net/wireless/ath/ath10k/Kconfig"
 source "drivers/net/wireless/ath/wcn36xx/Kconfig"
 source "drivers/net/wireless/ath/ath11k/Kconfig"
+source "drivers/net/wireless/ath/ath12k/Kconfig"
 
 endif

drivers/net/wireless/ath/Makefile

@@ -8,6 +8,7 @@ obj-$(CONFIG_WIL6210)		+= wil6210/
 obj-$(CONFIG_ATH10K)		+= ath10k/
 obj-$(CONFIG_WCN36XX)		+= wcn36xx/
 obj-$(CONFIG_ATH11K)		+= ath11k/
+obj-$(CONFIG_ATH12K)		+= ath12k/
 
 obj-$(CONFIG_ATH_COMMON)	+= ath.o
 

drivers/net/wireless/ath/ath12k/Kconfig

@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: BSD-3-Clause-Clear
+config ATH12K
+	tristate "Qualcomm Technologies Wi-Fi 7 support (ath12k)"
+	depends on MAC80211 && HAS_DMA && PCI
+	depends on CRYPTO_MICHAEL_MIC
+	select QCOM_QMI_HELPERS
+	select MHI_BUS
+	select QRTR
+	select QRTR_MHI
+	help
+	  Enable support for Qualcomm Technologies Wi-Fi 7 (IEEE
+	  802.11be) family of chipsets, for example WCN7850 and
+	  QCN9274.
+
+	  If you choose to build a module, it'll be called ath12k.
+
+config ATH12K_DEBUG
+	bool "ath12k debugging"
+	depends on ATH12K
+	help
+	  Enable debug support, for example debug messages which must
+	  be enabled separately using the debug_mask module parameter.
+
+	  If unsure, say Y to make it easier to debug problems. But if
+	  you want optimal performance choose N.
+
+config ATH12K_TRACING
+	bool "ath12k tracing support"
+	depends on ATH12K && EVENT_TRACING
+	help
+	  Enable ath12k tracing infrastructure.
+
+	  If unsure, say Y to make it easier to debug problems. But if
+	  you want optimal performance choose N.

drivers/net/wireless/ath/ath12k/Makefile

@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: BSD-3-Clause-Clear
+obj-$(CONFIG_ATH12K) += ath12k.o
+ath12k-y += core.o \
+	    hal.o \
+	    hal_tx.o \
+	    hal_rx.o \
+	    wmi.o \
+	    mac.o \
+	    reg.o \
+	    htc.o \
+	    qmi.o \
+	    dp.o  \
+	    dp_tx.o \
+	    dp_rx.o \
+	    debug.o \
+	    ce.o \
+	    peer.o \
+	    dbring.o \
+	    hw.o \
+	    mhi.o \
+	    pci.o \
+	    dp_mon.o
+
+ath12k-$(CONFIG_ATH12K_TRACING) += trace.o
+
+# for tracing framework to find trace.h
+CFLAGS_trace.o := -I$(src)