oxnas: reboot target

Reboot the oxnas target based on Linux 4.14 by rebasing our support on
top of the now-existing upstream kernel support.
This commit brings oxnas support to the level of v4.17 having upstream
drivers for Ethernet, Serial and NAND flash.
Botch up OpenWrt's local drivers for EHCI, SATA and PCIe based on the
new platform code and device-tree.
Re-introduce base-files from old oxnas target which works for now but
needs further clean-up towards generic board support.

Functional issues:
 * PCIe won't come up (hence no USB3 on Shuttle KD20)
 * I2C bus of Akitio myCloud device is likely not to work (missing
   debounce support in new pinctrl driver)

Code-style issues:
 * plla/pllb needs further cleanup -- currently their users are writing
   into the syscon regmap after acquireling the clk instead of using
   defined clk_*_*() functions to setup multipliers and dividors.
 * PCIe phy needs its own little driver.
 * SATA driver is a monster and should be split into an mfd having
   a raidctrl regmap, sata controller, sata ports and sata phy.

Tested on MitraStar STG-212 aka. Medion Akoya MD86xxx and Shuttle KD20.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(squash-picked commit 17511a7ea8 and commit dcc34574ef from master)

1 files changed, 51 insertions, 0 deletions

diff --git a/target/linux/oxnas/patches-4.14/800-oxnas-ehci.patch b/target/linux/oxnas/patches-4.14/800-oxnas-ehci.patch
new file mode 100644
index 0000000000..8fd6f69c1d
--- /dev/null
+++ b/target/linux/oxnas/patches-4.14/800-oxnas-ehci.patch
@@ -0,0 +1,51 @@
+--- a/drivers/usb/host/Kconfig
++++ b/drivers/usb/host/Kconfig
+@@ -334,6 +334,13 @@ config USB_OCTEON_EHCI
+ 	  USB 2.0 device support.  All CN6XXX based chips with USB are
+ 	  supported.
+ 
++config USB_EHCI_OXNAS
++	tristate "OXNAS EHCI Module"
++	depends on USB_EHCI_HCD && ARCH_OXNAS
++	select USB_EHCI_ROOT_HUB_TT
++	---help---
++	  Enable support for the OX820 SOC's on-chip EHCI controller.
++
+ endif # USB_EHCI_HCD
+ 
+ config USB_OXU210HP_HCD
+--- a/drivers/usb/host/Makefile
++++ b/drivers/usb/host/Makefile
+@@ -43,6 +43,7 @@ obj-$(CONFIG_USB_EHCI_HCD_AT91) += ehci-
+ obj-$(CONFIG_USB_EHCI_MSM)	+= ehci-msm.o
+ obj-$(CONFIG_USB_EHCI_TEGRA)	+= ehci-tegra.o
+ obj-$(CONFIG_USB_W90X900_EHCI)	+= ehci-w90x900.o
++obj-$(CONFIG_USB_EHCI_OXNAS)	+= ehci-oxnas.o
+ 
+ obj-$(CONFIG_USB_OXU210HP_HCD)	+= oxu210hp-hcd.o
+ obj-$(CONFIG_USB_ISP116X_HCD)	+= isp116x-hcd.o
+--- a/arch/arm/boot/dts/ox820.dtsi
++++ b/arch/arm/boot/dts/ox820.dtsi
+@@ -120,6 +120,22 @@
+ 			status = "disabled";
+ 		};
+ 
++		ehci: ehci@40200100 {
++			compatible = "plxtech,nas782x-ehci";
++			reg = <0x40200100 0xf00>;
++			interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
++			clocks = <&stdclk CLK_820_USBMPH>, <&pllb>, <&stdclk CLK_820_REF600>;
++			clock-names = "usb", "refsrc", "phyref";
++			resets = <&reset RESET_USBHS>, <&reset RESET_USBPHYA>, <&reset RESET_USBPHYB>;
++			reset-names = "host", "phya", "phyb";
++			oxsemi,sys-ctrl = <&sys>;
++			/* Otherwise ref300 is used, which is derived from sata phy
++			 * in that case, usb depends on sata initialization */
++			/* FIXME: how to make this dependency explicit ? */
++			oxsemi,ehci_use_pllb;
++			status = "disabled";
++		};
++
+ 		apb-bridge@44000000 {
+ 			#address-cells = <1>;
+ 			#size-cells = <1>;