arm: rmobile: Add Silicon Linux EK874 board support

The EK874 development kit from Silicon Linux is made of CAT874 (the main
board) and CAT875 (the sub board that goes on top of CAT874).

This patch adds the required board support to boot Si-Linux EK874 board
based on R8A774C0 SoC.

DTS files apart from r8a774c0-ek874-u-boot.dts and r8a774c0-u-boot.dtsi
have been imported from Linux kernel 5.11 commit f40ddce88593
("Linux 5.11").

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/board/silinux/ek874/ek874.c b/board/silinux/ek874/ek874.c
new file mode 100644
index 0000000..5a219cd
--- /dev/null
+++ b/board/silinux/ek874/ek874.c
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * board/silinux/ek874/ek874.c
+ *     This file is ek874 board support.
+ *
+ * Copyright (C) 2021 Renesas Electronics Corporation
+ */
+
+#include <common.h>
+#include <asm/global_data.h>
+#include <asm/io.h>
+
+#define RST_BASE	0xE6160000
+#define RST_CA53RESCNT	(RST_BASE + 0x44)
+#define RST_CA53_CODE	0x5A5A000F
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int board_init(void)
+{
+	/* address of boot parameters */
+	gd->bd->bi_boot_params = CONFIG_SYS_TEXT_BASE + 0x50000;
+
+	return 0;
+}
+
+void reset_cpu(ulong addr)
+{
+	writel(RST_CA53_CODE, RST_CA53RESCNT);
+}