arm64: versal: Add support for new Xilinx Versal ACAPs

Xilinx is introducing Versal, an adaptive compute acceleration platform
(ACAP), built on 7nm FinFET process technology. Versal ACAPs combine
Scalar Processing Engines, Adaptable Hardware Engines, and Intelligent
Engines with leading-edge memory and interfacing technologies to deliver
powerful heterogeneous acceleration for any application. The Versal AI
Core series has five devices, offering 128 to 400 AI Engines. The series
includes dual-core Arm Cortex™-A72 application processors, dual-core Arm
Cortex-R5 real-time processors, 256KB of on-chip memory with ECC, more
than 1,900 DSP engines optimized for high-precision floating point with
low latency.

The patch is adding necessary infrastructure in place without enabling
platform which is done in separate patch.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

board/xilinx/versal/MAINTAINERS

@@ -0,0 +1,7 @@
+XILINX_VERSAL BOARDS
+M:	Michal Simek <michal.simek@xilinx.com>
+S:	Maintained
+F:	arch/arm/dts/versal*
+F:	board/xilinx/versal/
+F:	include/configs/xilinx_versal*
+F:	configs/xilinx_versal*

board/xilinx/versal/Makefile

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2016 - 2018 Xilinx, Inc.
+# Michal Simek <michal.simek@xilinx.com>
+#
+
+obj-y	:= board.o

board/xilinx/versal/board.c

@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2014 - 2018 Xilinx, Inc.
+ * Michal Simek <michal.simek@xilinx.com>
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int board_init(void)
+{
+	printf("EL Level:\tEL%d\n", current_el());
+
+	return 0;
+}
+
+int board_early_init_r(void)
+{
+	if (current_el() == 3) {
+		u32 val;
+
+		writel(IOU_SWITCH_CTRL_CLKACT_BIT |
+		       (0x20 << IOU_SWITCH_CTRL_DIVISOR0_SHIFT),
+		       &crlapb_base->iou_switch_ctrl);
+
+		/* Global timer init - Program time stamp reference clk */
+		val = readl(&crlapb_base->timestamp_ref_ctrl);
+		val |= CRL_APB_TIMESTAMP_REF_CTRL_CLKACT_BIT;
+		writel(val, &crlapb_base->timestamp_ref_ctrl);
+
+		debug("ref ctrl 0x%x\n",
+		      readl(&crlapb_base->timestamp_ref_ctrl));
+
+		/* Clear reset of timestamp reg */
+		writel(0, &crlapb_base->rst_timestamp);
+
+		/*
+		 * Program freq register in System counter and
+		 * enable system counter.
+		 */
+		writel(COUNTER_FREQUENCY,
+		       &iou_scntr_secure->base_frequency_id_register);
+
+		debug("counter val 0x%x\n",
+		      readl(&iou_scntr_secure->base_frequency_id_register));
+
+		writel(IOU_SCNTRS_CONTROL_EN,
+		       &iou_scntr_secure->counter_control_register);
+
+		debug("scntrs control 0x%x\n",
+		      readl(&iou_scntr_secure->counter_control_register));
+		debug("timer 0x%llx\n", get_ticks());
+		debug("timer 0x%llx\n", get_ticks());
+	}
+
+	return 0;
+}
+
+int dram_init_banksize(void)
+{
+	fdtdec_setup_memory_banksize();
+
+	return 0;
+}
+
+int dram_init(void)
+{
+	if (fdtdec_setup_mem_size_base() != 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+void reset_cpu(ulong addr)
+{
+}