ARC: Add support for EM Development Kit board

Synopsys DesignWare ARC EM Development Kit (ARC EMDK) is
an FPGA-based development platform from Synopsys aimed to speed-up
development of software for ARC EM cores and entire subsystems based on
ARC EM like Data Fusion, Secure and Sensor & Control subsystems.

U-Boot is supposed to be used as a primary bootloader on EMDK allowing
users to easily load and start their application from micro-SD card.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

4 files changed, 116 insertions, 0 deletions

diff --git a/board/synopsys/emdk/Kconfig b/board/synopsys/emdk/Kconfig
new file mode 100644
index 0000000000..a9b834dbfd
--- /dev/null
+++ b/board/synopsys/emdk/Kconfig
@@ -0,0 +1,12 @@
+if TARGET_EMDK
+
+config SYS_BOARD
+	default "emdk"
+
+config SYS_VENDOR
+	default "synopsys"
+
+config SYS_CONFIG_NAME
+	default "emdk"
+
+endif
diff --git a/board/synopsys/emdk/MAINTAINERS b/board/synopsys/emdk/MAINTAINERS
new file mode 100644
index 0000000000..605e338445
--- /dev/null
+++ b/board/synopsys/emdk/MAINTAINERS
@@ -0,0 +1,5 @@
+EM DEVELOPMENT KIT BOARD
+M:	Alexey Brodkin <abrodkin@synopsys.com>
+S:	Maintained
+F:	board/synopsys/emdk/
+F:	configs/emdk_defconfig
diff --git a/board/synopsys/emdk/Makefile b/board/synopsys/emdk/Makefile
new file mode 100644
index 0000000000..4926c4e307
--- /dev/null
+++ b/board/synopsys/emdk/Makefile
@@ -0,0 +1,7 @@
+#
+# Copyright (C) 2018 Synopsys, Inc. All rights reserved.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y	+= emdk.o
diff --git a/board/synopsys/emdk/emdk.c b/board/synopsys/emdk/emdk.c
new file mode 100644
index 0000000000..bbb946a700
--- /dev/null
+++ b/board/synopsys/emdk/emdk.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Synopsys, Inc. All rights reserved.
+ */
+
+#include <common.h>
+#include <dwmmc.h>
+#include <malloc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define ARC_PERIPHERAL_BASE	0xF0000000
+#define SDIO_BASE		(ARC_PERIPHERAL_BASE + 0x10000)
+
+int board_mmc_init(bd_t *bis)
+{
+	struct dwmci_host *host = NULL;
+
+	host = malloc(sizeof(struct dwmci_host));
+	if (!host) {
+		printf("dwmci_host malloc fail!\n");
+		return 1;
+	}
+
+	memset(host, 0, sizeof(struct dwmci_host));
+	host->name = "Synopsys Mobile storage";
+	host->ioaddr = (void *)SDIO_BASE;
+	host->buswidth = 4;
+	host->dev_index = 0;
+	host->bus_hz = 50000000;
+
+	add_dwmci(host, host->bus_hz / 2, 400000);
+
+	return 0;
+}
+
+#define CREG_BASE		0xF0001000
+#define CREG_BOOT_OFFSET	0
+#define CREG_BOOT_WP_OFFSET	8
+
+#define CGU_BASE		0xF0000000
+#define CGU_IP_SW_RESET		0x0FF0
+
+void reset_cpu(ulong addr)
+{
+	writel(1, (u32 *)(CGU_BASE + CGU_IP_SW_RESET));
+	while (1)
+		; /* loop forever till reset */
+}
+
+static int do_emdk_rom(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	u32 creg_boot = readl((u32 *)(CREG_BASE + CREG_BOOT_OFFSET));
+
+	if (!strcmp(argv[1], "unlock"))
+		creg_boot &= ~BIT(CREG_BOOT_WP_OFFSET);
+	else if (!strcmp(argv[1], "lock"))
+		creg_boot |= BIT(CREG_BOOT_WP_OFFSET);
+	else
+		return CMD_RET_USAGE;
+
+	writel(creg_boot, (u32 *)(CREG_BASE + CREG_BOOT_OFFSET));
+
+	return CMD_RET_SUCCESS;
+}
+
+cmd_tbl_t cmd_emdk[] = {
+	U_BOOT_CMD_MKENT(rom, 2, 0, do_emdk_rom, "", ""),
+};
+
+static int do_emdk(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	cmd_tbl_t *c;
+
+	c = find_cmd_tbl(argv[1], cmd_emdk, ARRAY_SIZE(cmd_emdk));
+
+	/* Strip off leading 'emdk' command */
+	argc--;
+	argv++;
+
+	if (c == NULL || argc > c->maxargs)
+		return CMD_RET_USAGE;
+
+	return c->cmd(cmdtp, flag, argc, argv);
+}
+
+U_BOOT_CMD(
+	emdk, CONFIG_SYS_MAXARGS, 0, do_emdk,
+	"Synopsys EMDK specific commands",
+	"rom unlock - Unlock non-volatile memory for writing\n"
+	"emdk rom lock - Lock non-volatile memory to prevent writing\n"
+);