x86: Add Intel Edison board files

Add Intel Edison board which is using U-Boot.

The patch is based on work done by the following people (in alphabetical
order):
	Aiden Park <aiden.park@intel.com>
	Dukjoon Jeon <dukjoon.jeon@intel.com>
	eric.park <eric.park@intel.com>
	Fabien Chereau <fabien.chereau@intel.com>
	Felipe Balbi <felipe.balbi@linux.intel.com>
	Scott D Phillips <scott.d.phillips@intel.com>
	Sebastien Colleur <sebastienx.colleur@intel.com>
	Steve Sakoman <steve.sakoman@intel.com>
	Vincent Tinelli <vincent.tinelli@intel.com>

In case we're building for Intel Edison, we must have 4096 bytes of
zeroes in the beginning on u-boot.bin. This is done in
board/intel/edison/config.mk.

First run sets hardware_id environment variable which is read from
System Controller Unit (SCU).

Serial number (serial# environment variable) is generated based on eMMC
CID.

MAC address on USB network interface is unique to the board but kept the
same all over the time.

Set mac address from U-Boot using following scheme:
	OUI = 02:00:86
	next 3 bytes of MAC address set from eMMC serial number

This allows to have a unique mac address across reboot and flashing.

Signed-off-by: Vincent Tinelli <vincent.tinelli@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
[bmeng: Add MAINTAINERS file for Intel Edison board]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

2 files changed, 90 insertions, 0 deletions

diff --git a/arch/x86/dts/Makefile b/arch/x86/dts/Makefile
index 3f534ad40a..6589495f23 100644
--- a/arch/x86/dts/Makefile
+++ b/arch/x86/dts/Makefile
@@ -10,6 +10,7 @@ dtb-y += bayleybay.dtb \
 	cougarcanyon2.dtb \
 	crownbay.dtb \
 	dfi-bt700-q7x-151.dtb \
+	edison.dtb \
 	efi.dtb \
 	galileo.dtb \
 	minnowmax.dtb \
diff --git a/arch/x86/dts/edison.dts b/arch/x86/dts/edison.dts
new file mode 100644
index 0000000000..0b04984c6e
--- /dev/null
+++ b/arch/x86/dts/edison.dts
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2017 Intel Corporation
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/dts-v1/;
+
+#include <dt-bindings/gpio/x86-gpio.h>
+#include <dt-bindings/interrupt-router/intel-irq.h>
+
+/include/ "skeleton.dtsi"
+/include/ "rtc.dtsi"
+/include/ "tsc_timer.dtsi"
+
+/ {
+	model = "Intel Edison";
+	compatible = "intel,edison";
+
+	aliases {
+		serial0 = &serial0;
+	};
+
+	chosen {
+		stdout-path = &serial0;
+	};
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			device_type = "cpu";
+			compatible = "cpu-x86";
+			reg = <0>;
+			intel,apic-id = <0>;
+		};
+
+		cpu@1 {
+			device_type = "cpu";
+			compatible = "cpu-x86";
+			reg = <1>;
+			intel,apic-id = <2>;
+		};
+	};
+
+	pci {
+		compatible = "pci-x86";
+		#address-cells = <3>;
+		#size-cells = <2>;
+		u-boot,dm-pre-reloc;
+		ranges = <0x02000000 0x0 0x80000000 0x80000000 0 0x40000000
+			  0x42000000 0x0 0xc0000000 0xc0000000 0 0x20000000
+			  0x01000000 0x0 0x2000 0x2000 0 0xe000>;
+	};
+
+	serial0: serial@ff010180 {
+		compatible = "intel,mid-uart";
+		reg = <0xff010180 0x100>;
+		reg-shift = <0>;
+		clock-frequency = <29491200>;
+		current-speed = <115200>;
+	};
+
+	emmc: mmc@ff3fc000 {
+		compatible = "intel,sdhci-tangier";
+		reg = <0xff3fc000 0x1000>;
+	};
+
+/*
+ * FIXME: For now U-Boot DM model doesn't allow to power up this controller.
+ * Enabling it will make U-Boot hang.
+ *
+	sdcard: mmc@ff3fa000 {
+		compatible = "intel,sdhci-tangier";
+		reg = <0xff3fa000 0x1000>;
+	};
+ */
+
+	pmu: power@ff00b000 {
+		compatible = "intel,pmu-mid";
+		reg = <0xff00b000 0x1000>;
+	};
+
+	scu: ipc@ff009000 {
+		compatible = "intel,scu-ipc";
+		reg = <0xff009000 0x1000>;
+	};
+};