usb: xhci-pci: Load ASMedia XHCI controller firmware

The ASMedia XHCI controller found on some of the Apple Silicon
machines needs firmware to operate.  Use the file system
firmware loader interface to read the firmware and load it
onto the controller.  This allows keyboards connected to the
type-A ports on these machines to function in U-Boot.

Signed-off-by: Mark Kettenis <[email protected]>

Author: kettenis

MAINTAINERS

@@ -137,6 +137,7 @@ F:	drivers/nvme/nvme_apple.c
 F:	drivers/pci/pcie_apple.c
 F:	drivers/phy/phy-apple-atc.c
 F:	drivers/pinctrl/pinctrl-apple.c
+F:	drivers/usb/host/xhci-pci-asmedia.c
 F:	drivers/watchdog/apple_wdt.c
 F:	include/configs/apple.h
 

drivers/usb/host/Kconfig

@@ -102,6 +102,17 @@ config USB_XHCI_PCI
 	help
 	  Enables support for the PCI-based xHCI controller.
 
+config USB_XHCI_PCI_ASMEDIA
+	bool "Support for ASMedia xHCI USB controller"
+	depends on USB_XHCI_PCI
+	default y if ARCH_APPLE
+	select FS_LOADER
+	help
+	  Enables support for loading firmware for the ASMedia xHCI
+	  controller.  This is needed on Apple Silicon machines that
+	  contain ASMedia xHCI controllers without the full USB
+	  firmware.
+
 config USB_XHCI_RCAR
 	bool "Renesas R-Car USB 3.0 support"
 	default y

drivers/usb/host/Makefile

@@ -53,6 +53,7 @@ obj-$(CONFIG_USB_XHCI_MVEBU) += xhci-mvebu.o
 obj-$(CONFIG_USB_XHCI_GENERIC) += xhci-generic.o
 obj-$(CONFIG_USB_XHCI_OMAP) += xhci-omap.o
 obj-$(CONFIG_USB_XHCI_PCI) += xhci-pci.o
+obj-$(CONFIG_USB_XHCI_PCI_ASMEDIA) += xhci-pci-asmedia.o
 obj-$(CONFIG_USB_XHCI_RCAR) += xhci-rcar.o
 obj-$(CONFIG_USB_XHCI_OCTEON) += dwc3-octeon-glue.o