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>

board/intel/Kconfig

@@ -35,6 +35,13 @@ config TARGET_CROWNBAY
 	  Intel Platform Controller Hub EG20T, other system components and
 	  peripheral connectors for PCIe/SATA/USB/LAN/SD/UART/Audio/LVDS.
 
+config TARGET_EDISON
+	bool "Edison"
+	help
+	  This is the Intel Edison Compute Module. It contains a dual core Intel
+	  Atom Tangier CPU, 1 GB RAM integrated on package. There is also 4 GB
+	  eMMC flash on board, Wi-Fi, Bluetooth 4 and USB controllers.
+
 config TARGET_GALILEO
 	bool "Galileo"
 	help
@@ -64,6 +71,7 @@ endchoice
 source "board/intel/bayleybay/Kconfig"
 source "board/intel/cougarcanyon2/Kconfig"
 source "board/intel/crownbay/Kconfig"
+source "board/intel/edison/Kconfig"
 source "board/intel/galileo/Kconfig"
 source "board/intel/minnowmax/Kconfig"
 

board/intel/edison/Kconfig

@@ -0,0 +1,26 @@
+if TARGET_EDISON
+
+config SYS_BOARD
+	default "edison"
+
+config SYS_VENDOR
+	default "intel"
+
+config SYS_SOC
+	default "tangier"
+
+config SYS_CONFIG_NAME
+	default "edison"
+
+config SYS_TEXT_BASE
+	default 0x01101000
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+	select X86_LOAD_FROM_32_BIT
+	select INTEL_MID
+	select INTEL_TANGIER
+	select BOARD_LATE_INIT
+	select MD5
+
+endif

board/intel/edison/MAINTAINERS

@@ -0,0 +1,6 @@
+Intel Edison Board
+M:	Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+S:	Maintained
+F:	board/intel/edison
+F:	include/configs/edison.h
+F:	configs/edison_defconfig

board/intel/edison/Makefile

@@ -0,0 +1,7 @@
+#
+# Copyright (c) 2017 Intel Corporation
+#
+# SPDX-License-Identifier:     GPL-2.0+
+#
+
+obj-y	+= start.o edison.o

board/intel/edison/config.mk

@@ -0,0 +1,18 @@
+#
+# Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+# Copyright (c) 2017 Intel Corporation
+#
+# SPDX-License-Identifier:	GPL-2.0	BSD-3-Clause
+#
+
+# Add 4096 bytes of zeroes to u-boot.bin
+quiet_cmd_mkalign_eds = EDSALGN $@
+cmd_mkalign_eds =							\
+	dd if=$^ of=$@ bs=4k seek=1 2>/dev/null &&			\
+	mv $@ $^
+
+ALL-y += u-boot-align.bin
+u-boot-align.bin: u-boot.bin
+	$(call if_changed,mkalign_eds)
+
+HOSTCFLAGS_autoconf.mk.dep = -Wno-variadic-macros

board/intel/edison/edison.c

@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2017 Intel Corporation
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <dwc3-uboot.h>
+#include <mmc.h>
+#include <u-boot/md5.h>
+#include <usb.h>
+#include <watchdog.h>
+
+#include <linux/usb/gadget.h>
+
+#include <asm/cache.h>
+#include <asm/scu.h>
+#include <asm/u-boot-x86.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static struct dwc3_device dwc3_device_data = {
+	.maximum_speed = USB_SPEED_HIGH,
+	.base = CONFIG_SYS_USB_OTG_BASE,
+	.dr_mode = USB_DR_MODE_PERIPHERAL,
+	.index = 0,
+};
+
+int usb_gadget_handle_interrupts(int controller_index)
+{
+	dwc3_uboot_handle_interrupt(controller_index);
+	WATCHDOG_RESET();
+	return 0;
+}
+
+int board_usb_init(int index, enum usb_init_type init)
+{
+	if (index == 0 && init == USB_INIT_DEVICE)
+		return dwc3_uboot_init(&dwc3_device_data);
+	return -EINVAL;
+}
+
+int board_usb_cleanup(int index, enum usb_init_type init)
+{
+	if (index == 0 && init == USB_INIT_DEVICE) {
+		dwc3_uboot_exit(index);
+		return 0;
+	}
+	return -EINVAL;
+}
+
+static void assign_serial(void)
+{
+	struct mmc *mmc = find_mmc_device(0);
+	unsigned char ssn[16];
+	char usb0addr[18];
+	char serial[33];
+	int i;
+
+	if (!mmc)
+		return;
+
+	md5((unsigned char *)mmc->cid, sizeof(mmc->cid), ssn);
+
+	snprintf(usb0addr, sizeof(usb0addr), "02:00:86:%02x:%02x:%02x",
+		 ssn[13], ssn[14], ssn[15]);
+	setenv("usb0addr", usb0addr);
+
+	for (i = 0; i < 16; i++)
+		snprintf(&serial[2 * i], 3, "%02x", ssn[i]);
+	setenv("serial#", serial);
+
+#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
+	saveenv();
+#endif
+}
+
+static void assign_hardware_id(void)
+{
+	struct ipc_ifwi_version v;
+	char hardware_id[4];
+	int ret;
+
+	ret = scu_ipc_command(IPCMSG_GET_FW_REVISION, 1, NULL, 0, (u32 *)&v, 4);
+	if (ret < 0)
+		printf("Can't retrieve hardware revision\n");
+
+	snprintf(hardware_id, sizeof(hardware_id), "%02X", v.hardware_id);
+	setenv("hardware_id", hardware_id);
+
+#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
+	saveenv();
+#endif
+}
+
+int board_late_init(void)
+{
+	if (!getenv("serial#"))
+		assign_serial();
+
+	if (!getenv("hardware_id"))
+		assign_hardware_id();
+
+	return 0;
+}

board/intel/edison/start.S

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * (C) Copyright 2008
+ * Graeme Russ, graeme.russ@gmail.com.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/* board early intialization */
+.globl early_board_init
+early_board_init:
+	/* No 32-bit board specific initialisation */
+	jmp	early_board_init_ret