arm: nuvoton: Add support for Nuvoton NPCM750 BMC

Add basic support for the Nuvoton NPCM750 EVB (Poleg).

Signed-off-by: Jim Liu <JJLIU0@nuvoton.com>

board/nuvoton/poleg_evb/Kconfig

@@ -0,0 +1,25 @@
+if TARGET_POLEG
+
+config SYS_BOARD
+	default "poleg_evb"
+
+config SYS_VENDOR
+	default "nuvoton"
+
+config SYS_CONFIG_NAME
+	default "poleg"
+
+choice
+	prompt "Target board select"
+	default TARGET_POLEG_EVB
+
+config TARGET_POLEG_EVB
+	bool "Poleg EVB"
+	help
+	  poleg EVB is Nuvoton evaluation board for NPCM750 SoC,
+	  supports general functions of Basebase Management
+	  Controller(BMC).
+
+endchoice
+
+endif

board/nuvoton/poleg_evb/MAINTAINERS

@@ -0,0 +1,7 @@
+Poleg EVB
+M:	Stanley Chu <yschu@nuvoton.com>
+M:	Jim Liu <JJLIU0@nuvoton.com>
+S:	Maintained
+F:	board/nuvoton/poleg_evb/
+F:	include/configs/poleg.h
+F:	configs/poleg_evb_defconfig

board/nuvoton/poleg_evb/Makefile

@@ -0,0 +1 @@
+obj-y	:= poleg_evb.o

board/nuvoton/poleg_evb/poleg_evb.c

@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *
+ * Copyright (c) 2021 Nuvoton Technology Corp.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <asm/io.h>
+#include <asm/arch/gcr.h>
+#include <asm/mach-types.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int board_init(void)
+{
+	return 0;
+}
+
+int dram_init(void)
+{
+	struct npcm_gcr *gcr = (struct npcm_gcr *)NPCM_GCR_BA;
+
+	int ramsize = (readl(&gcr->intcr3) >> 8) & 0x7;
+
+	switch (ramsize) {
+	case 0:
+		gd->ram_size = 0x08000000; /* 128 MB. */
+		break;
+	case 1:
+		gd->ram_size = 0x10000000; /* 256 MB. */
+		break;
+	case 2:
+		gd->ram_size = 0x20000000; /* 512 MB. */
+		break;
+	case 3:
+		gd->ram_size = 0x40000000; /* 1024 MB. */
+		break;
+	case 4:
+		gd->ram_size = 0x80000000; /* 2048 MB. */
+		break;
+
+	default:
+	break;
+	}
+
+	return 0;
+}