brcm2708: Add Raspberry Pi 4 support

- Support added to bcm2709 subtarget (32 bit).
- 64 bit kernel still requires many hacks on RPi 4B.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

target/linux/brcm2708/base-files/etc/board.d/02_network

@@ -16,7 +16,8 @@ raspberrypi,model-b-plus |\
 raspberrypi,model-b-rev2 |\
 raspberrypi,2-model-b |\
 raspberrypi,3-model-b |\
-raspberrypi,3-model-b-plus)
+raspberrypi,3-model-b-plus |\
+raspberrypi,4-model-b)
 	ucidef_set_interface_lan "eth0"
 	;;
 

target/linux/brcm2708/base-files/lib/preinit/05_set_preinit_iface_brcm2708

@@ -9,6 +9,7 @@ set_preinit_iface() {
 	raspberrypi,2-model-b |\
 	raspberrypi,3-model-b |\
 	raspberrypi,3-model-b-plus |\
+	raspberrypi,4-model-b |\
 	raspberrypi,model-b |\
 	raspberrypi,model-b-plus |\
 	raspberrypi,model-b-rev2)

target/linux/brcm2708/bcm2709/config-4.19

@@ -223,6 +223,8 @@ CONFIG_GENERIC_IRQ_MIGRATION=y
 CONFIG_GENERIC_IRQ_MULTI_HANDLER=y
 CONFIG_GENERIC_IRQ_SHOW=y
 CONFIG_GENERIC_IRQ_SHOW_LEVEL=y
+CONFIG_GENERIC_MSI_IRQ=y
+CONFIG_GENERIC_MSI_IRQ_DOMAIN=y
 CONFIG_GENERIC_PCI_IOMAP=y
 CONFIG_GENERIC_PHY=y
 CONFIG_GENERIC_PINCONF=y
@@ -388,9 +390,11 @@ CONFIG_OLD_SIGSUSPEND3=y
 CONFIG_PADATA=y
 CONFIG_PAGE_OFFSET=0xC0000000
 CONFIG_PCI=y
-# CONFIG_PCIE_BRCMSTB is not set
+CONFIG_PCIE_BRCMSTB=y
 CONFIG_PCI_DOMAINS=y
 CONFIG_PCI_DOMAINS_GENERIC=y
+CONFIG_PCI_MSI=y
+CONFIG_PCI_MSI_IRQ_DOMAIN=y
 # CONFIG_PCI_V3_SEMI is not set
 CONFIG_PERF_USE_VMALLOC=y
 CONFIG_PGTABLE_LEVELS=3
@@ -478,10 +482,15 @@ CONFIG_USB_DWCOTG=y
 CONFIG_USB_LAN78XX=y
 CONFIG_USB_NET_DRIVERS=y
 CONFIG_USB_NET_SMSC95XX=y
+CONFIG_USB_PCI=y
 CONFIG_USB_STORAGE=y
 CONFIG_USB_SUPPORT=y
 CONFIG_USB_UAS=y
+# CONFIG_USB_UHCI_HCD is not set
 CONFIG_USB_USBNET=y
+CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_XHCI_PCI=y
+CONFIG_USB_XHCI_PLATFORM=y
 CONFIG_USE_OF=y
 CONFIG_VFP=y
 CONFIG_VFPv3=y

target/linux/brcm2708/bcm2709/target.mk

@@ -4,11 +4,11 @@
 #
 
 SUBTARGET:=bcm2709
-BOARDNAME:=BCM2709/BCM2710 boards (32 bit)
+BOARDNAME:=BCM2709/BCM2710/BCM2711 boards (32 bit)
 CPU_TYPE:=cortex-a7
 CPU_SUBTYPE:=neon-vfpv4
 
 define Target/Description
-	Build firmware image for BCM2709/BCM2710 devices.
+	Build firmware image for BCM2709/BCM2710/BCM2711 devices.
 	This firmware features a 32 bit kernel.
 endef

target/linux/brcm2708/image/Makefile

@@ -21,18 +21,12 @@ define Build/kernel-img
 	mv $@.tmp $@
 endef
 
-define Build/boot-img
+define Build/boot-common
 	rm -f $@.boot
 	mkfs.fat -C $@.boot $(FAT32_BLOCKS)
 	mcopy -i $@.boot $(KDIR)/COPYING.linux ::
 	mcopy -i $@.boot $(KDIR)/bootcode.bin ::
 	mcopy -i $@.boot $(KDIR)/LICENCE.broadcom ::
-	mcopy -i $@.boot $(KDIR)/start.elf ::
-	mcopy -i $@.boot $(KDIR)/start_cd.elf ::
-	mcopy -i $@.boot $(KDIR)/start_x.elf ::
-	mcopy -i $@.boot $(KDIR)/fixup.dat ::
-	mcopy -i $@.boot $(KDIR)/fixup_cd.dat ::
-	mcopy -i $@.boot $(KDIR)/fixup_x.dat ::
 	mcopy -i $@.boot cmdline.txt ::
 	mcopy -i $@.boot config.txt ::
 	mcopy -i $@.boot $(IMAGE_KERNEL) ::$(KERNEL_IMG)
@@ -42,6 +36,24 @@ define Build/boot-img
 	mcopy -i $@.boot $(DTS_DIR)/overlays/README ::/overlays/
 endef
 
+define Build/boot-2708
+	mcopy -i $@.boot $(KDIR)/start.elf ::
+	mcopy -i $@.boot $(KDIR)/start_cd.elf ::
+	mcopy -i $@.boot $(KDIR)/start_x.elf ::
+	mcopy -i $@.boot $(KDIR)/fixup.dat ::
+	mcopy -i $@.boot $(KDIR)/fixup_cd.dat ::
+	mcopy -i $@.boot $(KDIR)/fixup_x.dat ::
+endef
+
+ define Build/boot-2711
+	mcopy -i $@.boot $(KDIR)/start4.elf ::
+	mcopy -i $@.boot $(KDIR)/start4cd.elf ::
+	mcopy -i $@.boot $(KDIR)/start4x.elf ::
+	mcopy -i $@.boot $(KDIR)/fixup4.dat ::
+	mcopy -i $@.boot $(KDIR)/fixup4cd.dat ::
+	mcopy -i $@.boot $(KDIR)/fixup4x.dat ::
+endef
+
 define Build/sdcard-img
 	./gen_rpi_sdcard_img.sh $@ $@.boot $(IMAGE_ROOTFS) \
 		$(CONFIG_TARGET_KERNEL_PARTSIZE) $(CONFIG_TARGET_ROOTFS_PARTSIZE)
@@ -52,8 +64,8 @@ define Device/Default
   KERNEL := kernel-bin | kernel-img
   KERNEL_IMG := kernel.img
   IMAGES := factory.img.gz sysupgrade.img.gz
-  IMAGE/sysupgrade.img.gz := boot-img | sdcard-img | gzip | append-metadata
-  IMAGE/factory.img.gz := boot-img | sdcard-img | gzip
+  IMAGE/sysupgrade.img.gz := boot-common | boot-2708 | sdcard-img | gzip | append-metadata
+  IMAGE/factory.img.gz := boot-common | boot-2708 | sdcard-img | gzip
 endef
 
 define Device/rpi
@@ -74,8 +86,8 @@ ifeq ($(SUBTARGET),bcm2708)
 endif
 
 define Device/rpi-2
-  DEVICE_TITLE := Raspberry Pi 2B/3B/3B+/3CM
-  DEVICE_DTS := bcm2709-rpi-2-b bcm2710-rpi-3-b bcm2710-rpi-3-b-plus bcm2710-rpi-cm3
+  DEVICE_TITLE := Raspberry Pi 2B/3B/3B+/3CM/4B
+  DEVICE_DTS := bcm2709-rpi-2-b bcm2710-rpi-3-b bcm2710-rpi-3-b-plus bcm2711-rpi-4-b bcm2710-rpi-cm3
   SUPPORTED_DEVICES := \
 	rpi-2-b rpi-3-b rpi-3-b-plus rpi-cm \
 	raspberrypi,2-model-b \
@@ -85,8 +97,10 @@ define Device/rpi-2
 	brcmfmac-firmware-43430-sdio \
 	brcmfmac-firmware-43430-sdio-rpi-3b \
 	brcmfmac-firmware-43455-sdio brcmfmac-firmware-43455-clm_blob \
-	brcmfmac-firmware-43455-sdio-rpi-3b-plus \
+	brcmfmac-firmware-43455-sdio-rpi-3b-plus brcmfmac-firmware-43455-sdio-rpi-4b \
 	kmod-brcmfmac wpad-basic
+  IMAGE/sysupgrade.img.gz := boot-common | boot-2708 | boot-2711 | sdcard-img | gzip | append-metadata
+  IMAGE/factory.img.gz := boot-common | boot-2708 | boot-2711 | sdcard-img | gzip
 endef
 ifeq ($(SUBTARGET),bcm2709)
   TARGET_DEVICES += rpi-2