Simone
4697ce3e3b
Add a driver for the integrated memory controller (iMC) SMBus engine on Intel Skylake-X / Cascade Lake-X processors (socket LGA 2066, platform X299, PCU function 8086:2085). The engine provides two SMBus channels — one per pair of DIMM slots — over which SPD EEPROMs, DDR4 thermal sensors and third-party LED controllers are accessible. Exposing it as a pair of standard Linux I2C adapters lets existing tools (i2c-tools, lm-sensors) use it without bespoke sysfs hacks. Key design decisions: - ECAM MMIO access instead of CF8/CFC port I/O (SMM traps port writes) - Dynamic MCFG table parsing for mmcfg_base (no hardcoding) - Support for SMBus BYTE_DATA and WORD_DATA transfers - devm-managed resources with automatic cleanup - Global mutex to serialize transactions across both channels sharing the same ECAM mapping Signed-off-by: Simone Chifari <simone.chifari@gmail.com>
64 lines
1.9 KiB
Makefile
64 lines
1.9 KiB
Makefile
obj-m := i2c-imc-skylake.o
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KVER ?= $(shell uname -r)
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KDIR ?= /lib/modules/$(KVER)/build
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MODDIR = /lib/modules/$(KVER)/kernel/drivers/i2c/busses
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PWD := $(shell pwd)
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all:
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$(MAKE) -C $(KDIR) M=$(PWD) modules
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clean:
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$(MAKE) -C $(KDIR) M=$(PWD) clean
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# Install into kernel tree + modprobe.
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# Ubuntu/Debian kernel 6.x+ ships .ko.zst; depmod skips uncompressed .ko files,
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# so compress with zstd when available, else fall back to plain .ko.
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install: all
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if command -v zstd >/dev/null 2>&1; then \
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zstd -q -f i2c-imc-skylake.ko -o i2c-imc-skylake.ko.zst; \
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sudo install -D -m 644 i2c-imc-skylake.ko.zst $(MODDIR)/i2c-imc-skylake.ko.zst; \
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sudo rm -f $(MODDIR)/i2c-imc-skylake.ko; \
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else \
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sudo install -D -m 644 i2c-imc-skylake.ko $(MODDIR)/i2c-imc-skylake.ko; \
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sudo rm -f $(MODDIR)/i2c-imc-skylake.ko.zst; \
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fi
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sudo depmod -a $(KVER)
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sudo modprobe i2c-imc-skylake
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# Remove module and .ko/.ko.zst from kernel tree
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uninstall:
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sudo rmmod i2c-imc-skylake 2>/dev/null || true
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sudo rm -f $(MODDIR)/i2c-imc-skylake.ko $(MODDIR)/i2c-imc-skylake.ko.zst
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sudo depmod -a $(KVER)
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# Quick rmmod + insmod cycle for leak/oops testing
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reload: all
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sudo rmmod i2c-imc-skylake 2>/dev/null || true
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sudo insmod i2c-imc-skylake.ko
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# Load without build (use after install)
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load:
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sudo modprobe i2c-dev
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sudo modprobe i2c-imc-skylake
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unload:
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sudo rmmod i2c-imc-skylake 2>/dev/null || true
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# Checkpatch (must be clean before submission)
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checkpatch:
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perl $(KDIR)/scripts/checkpatch.pl --strict --no-tree -f i2c-imc-skylake.c
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# Sparse static analysis (requires sparse >= kernel version; may show header errors on old sparse)
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sparse:
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$(MAKE) -C $(KDIR) M=$(PWD) C=1 CF="-D__CHECK_ENDIAN__"
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# Smoke test — requires root + module loaded (run after make install or make reload)
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test:
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sudo bash test-smoke.sh
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log:
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sudo dmesg | grep i2c-imc-skylake | tail -80
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.PHONY: all clean install uninstall reload load unload checkpatch sparse test log
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