5 files changed, 207 insertions, 0 deletions
diff --git a/board/synopsys/emsdp/Kconfig b/board/synopsys/emsdp/Kconfig
new file mode 100644
index 0000000000..8228bb5c74
--- /dev/null
+++ b/board/synopsys/emsdp/Kconfig
@@ -0,0 +1,12 @@
+if TARGET_EMSDP
+
+config SYS_BOARD
+	default "emsdp"
+
+config SYS_VENDOR
+	default "synopsys"
+
+config SYS_CONFIG_NAME
+	default "emsdp"
+
+endif
diff --git a/board/synopsys/emsdp/MAINTAINERS b/board/synopsys/emsdp/MAINTAINERS
new file mode 100644
index 0000000000..6404013957
--- /dev/null
+++ b/board/synopsys/emsdp/MAINTAINERS
@@ -0,0 +1,6 @@
+EM DEVELOPMENT KIT BOARD
+M:	Alexey Brodkin <abrodkin@synopsys.com>
+S:	Maintained
+F:	arch/arc/dts/emsdp.dts
+F:	board/synopsys/emsdp/
+F:	configs/emsdp_defconfig
diff --git a/board/synopsys/emsdp/Makefile b/board/synopsys/emsdp/Makefile
new file mode 100644
index 0000000000..733a48c46a
--- /dev/null
+++ b/board/synopsys/emsdp/Makefile
@@ -0,0 +1,7 @@
+#
+# Copyright (C) 2018 Synopsys, Inc. All rights reserved.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y	+= emsdp.o
diff --git a/board/synopsys/emsdp/README b/board/synopsys/emsdp/README
new file mode 100644
index 0000000000..034062e397
--- /dev/null
+++ b/board/synopsys/emsdp/README
@@ -0,0 +1,83 @@
+================================================================================
+Useful notes on bulding and using of U-Boot on
+ARC EM Software Development Platform (AKA EMSDP)
+================================================================================
+
+   BOARD OVERVIEW
+
+   The DesignWare ARC EM Software Development Platform is FPGA-bases platform
+   for rapid software development on the ARC EM family of processors.
+
+   Since this board is based on FPGA it's possible to load and use different
+   versions of ARC EM CPUs. U-Boot is built to be run on the simplest
+   possible configuration which means the same one binary will work on more
+   advanced configurations as well.
+
+   The board has the following features useful for U-Boot:
+    * On-board 2-channel FTDI TTL-to-USB converter
+      - The first channel is used for serial debug port (which makes it possible
+        to use a serial connection on pretty much any host machine be it
+        Windows, Linux or Mac).
+        On Linux machine typucally FTDI serial port would be /dev/ttyUSB0.
+        There's no HW flow-control and baud-rate is 115200.
+
+      - The second channel is used for built-in Digilent USB JTAG probe.
+        That means no extra hardware is required to access ARC core from a
+        debugger on development host. Both proprietary MetaWare debugger and
+        open source OpenOCD + GDB client are supported.
+
+      - Also with help of this FTDI chip it is possible to reset entire
+        board with help of a special `rff-ftdi-reset` utility, see:
+        https://github.com/foss-for-synopsys-dwc-arc-processors/rff-ftdi-reset
+
+    * Micro SD-card slot
+      - U-Boot expects to see the very first partition on the card formatted as
+        FAT file-system and uses it for keeping its environment in `uboot.env`
+        file. Note uboot.env is not just a text file but it is auto-generated
+        file created by U-Boot on invocation of `saveenv` command.
+        It contains a checksum which makes this saved environment invalid in
+        case of maual modification.
+
+      - There might be more useful files on that first FAT partition like
+        user applications, data files etc.
+
+    * 256 KiB of "ROM"
+      - This so-called "ROM" is a part of FPGA image and even though it
+        might be unlocked for writes its initial content will be restored
+        on the next power-on.
+
+
+   BUILDING U-BOOT
+
+   1. Configure U-Boot:
+      ------------------------->8----------------------
+      make emsdp_defconfig
+      ------------------------->8----------------------
+
+   2. To build Elf file (for example to be used with host debugger via JTAG
+      connection to the target board):
+      ------------------------->8----------------------
+      make mdbtrick
+      ------------------------->8----------------------
+
+      This will produce `u-boot` Elf file.
+
+   3. To build binary image to be put in "ROM":
+      ------------------------->8----------------------
+      make u-boot.bin
+      ------------------------->8----------------------
+
+
+   EXECUTING U-BOOT
+
+   1. The EMSDP board is supposed to auto-start U-Boot image stored in ROM on
+      power-on. For that make sure VCCIO DIP-switches are all in "off" state.
+
+   2. Though it is possible to load U-Boot as a simple Elf file via JTAG right
+      in "ROM" and start it from the debugger. One important note here we first
+      need to enable writes into "ROM" by writing 1 to 0xf0001000.
+
+      2.1. In case of proprietary MetaWare debugger run:
+      ------------------------->8----------------------
+      mdb -dll=opxdarc.so -OK -preloadexec="eval *(int*)0xf0001000=0" u-boot
+      ------------------------->8----------------------
diff --git a/board/synopsys/emsdp/emsdp.c b/board/synopsys/emsdp/emsdp.c
new file mode 100644
index 0000000000..b5ec7f17ec
--- /dev/null
+++ b/board/synopsys/emsdp/emsdp.c
@@ -0,0 +1,99 @@
+// 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;
+}
+
+int board_mmc_getcd(struct mmc *mmc)
+{
+	struct dwmci_host *host = mmc->priv;
+
+	return !(dwmci_readl(host, DWMCI_CDETECT) & 1);
+}
+
+#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_emsdp_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_emsdp[] = {
+	U_BOOT_CMD_MKENT(rom, 2, 0, do_emsdp_rom, "", ""),
+};
+
+static int do_emsdp(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	cmd_tbl_t *c;
+
+	c = find_cmd_tbl(argv[1], cmd_emsdp, ARRAY_SIZE(cmd_emsdp));
+
+	/* Strip off leading 'emsdp' command */
+	argc--;
+	argv++;
+
+	if (c == NULL || argc > c->maxargs)
+		return CMD_RET_USAGE;
+
+	return c->cmd(cmdtp, flag, argc, argv);
+}
+
+U_BOOT_CMD(
+	emsdp, CONFIG_SYS_MAXARGS, 0, do_emsdp,
+	"Synopsys EMSDP specific commands",
+	"rom unlock - Unlock non-volatile memory for writing\n"
+	"emsdp rom lock - Lock non-volatile memory to prevent writing\n"
+);