Commit aa125180 authored by Jai Luthra's avatar Jai Luthra Committed by Greg Kroah-Hartman
Browse files

platform/raspberrypi: Destage VCHIQ interface 



Destage the VCHIQ interface driver to drivers/platform/raspberrypi.

There is still the remaining TODO item of improving the documentation,
which can be handled post destaging.

Secondly, multimedia drivers like codec and ISP that rely on this
interface need to be upstreamed. And lastly, the drivers that facilitate
the shared memory between VideoCore and Linux, like the vc-sm-cma driver
and vc_mem char driver also need to be upstreamed.

Signed-off-by: default avatarJai Luthra <jai.luthra@ideasonboard.com>
Link: https://patch.msgid.link/20251029-vchiq-destage-v3-6-da8d6c83c2c5@ideasonboard.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b178ad64

MAINTAINERS

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@@ -4828,6 +4828,7 @@ S: Maintained 
T:	git https://github.com/broadcom/stblinux.git

F:	Documentation/devicetree/bindings/pci/brcm,stb-pcie.yaml

F:	drivers/pci/controller/pcie-brcmstb.c

F:	drivers/platform/raspberrypi/vchiq-*

F:	drivers/staging/vc04_services

F:	include/linux/raspberrypi/vchiq*

N:	bcm2711

drivers/platform/Kconfig

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@@ -18,3 +18,5 @@ source "drivers/platform/surface/Kconfig" 
source "drivers/platform/x86/Kconfig"



source "drivers/platform/arm64/Kconfig"



source "drivers/platform/raspberrypi/Kconfig"

drivers/platform/Makefile

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@@ -13,3 +13,4 @@ obj-$(CONFIG_CHROME_PLATFORMS) += chrome/ 
obj-$(CONFIG_CZNIC_PLATFORMS)	+= cznic/

obj-$(CONFIG_SURFACE_PLATFORMS)	+= surface/

obj-$(CONFIG_ARM64_PLATFORM_DEVICES)	+= arm64/

obj-$(CONFIG_BCM2835_VCHIQ)	+= raspberrypi/

drivers/platform/raspberrypi/Kconfig

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# SPDX-License-Identifier: GPL-2.0



menuconfig BCM_VIDEOCORE

	tristate "Broadcom VideoCore support"

	depends on OF

	depends on RASPBERRYPI_FIRMWARE || (COMPILE_TEST && !RASPBERRYPI_FIRMWARE)

	default y

	help

		Support for Broadcom VideoCore services including

		the BCM2835 family of products which is used

		by the Raspberry PI.



if BCM_VIDEOCORE



config BCM2835_VCHIQ

	tristate "BCM2835 VCHIQ"

	depends on HAS_DMA

	imply VCHIQ_CDEV

	help

		Broadcom BCM2835 and similar SoCs have a VPU called VideoCore.

		This config enables the VCHIQ driver, which implements a

		messaging interface between the kernel and the firmware running

		on VideoCore. Other drivers use this interface to communicate to

		the VPU. More specifically, the VCHIQ driver is used by

		audio/video and camera drivers as well as for implementing MMAL

		API, which is in turn used by several multimedia services on the

		BCM2835 family of SoCs.



		Defaults to Y when the Broadcom Videocore services are included

		in the build, N otherwise.



if BCM2835_VCHIQ



config VCHIQ_CDEV

	bool "VCHIQ Character Driver"

	help

		Enable the creation of VCHIQ character driver. The cdev exposes

		ioctls used by userspace libraries and testing tools to interact

		with VideoCore, via the VCHIQ core driver (Check BCM2835_VCHIQ

		for more info).



		This can be set to 'N' if the VideoCore communication is not

		needed by userspace but only by other kernel modules

		(like bcm2835-audio).



		If not sure, set this to 'Y'.



endif



endif

drivers/platform/raspberrypi/Makefile

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# SPDX-License-Identifier: GPL-2.0



obj-$(CONFIG_BCM2835_VCHIQ)	+= vchiq.o



vchiq-objs := \

   vchiq-interface/vchiq_core.o  \

   vchiq-interface/vchiq_arm.o \

   vchiq-interface/vchiq_bus.o \

   vchiq-interface/vchiq_debugfs.o \



ifdef CONFIG_VCHIQ_CDEV

vchiq-objs += vchiq-interface/vchiq_dev.o

endif