arc: Add support for IoT development kit

The DesignWare ARC IoT Development Kit is a versatile platform
that includes the necessary hardware and software to accelerate
software development and debugging of sensor fusion,
voice recognition and face detection designs.

More information is avaialble here [1] and here [2].

The board is based on real silicon with
ARC EM9D-based Data Fusion IP Subsystem.

It sports a rich set of I/O including
 * DW USB OTG
 * DW MobileStorage (used for micro SD-card)
 * GPIO
 * multiple serial interface including DW APB UART
 * ADC, PWM and eFlash, SRAM and SPI Flash memory
 * Real-Time Clock (RTC)
 * Bluetooth module with worldwide regulatory compliance
   (FCC, IC, CE, ETSI, TELEC)
 * On-board 9-axis sensor (gyro, accelerometer and compass)

Extensible with Arduino, Pmod, mikroBUS connectors and a 2x18
extension header.

One of the most interesting features for developers is built-in
Digilent USB JTAG probe so only micro-USB cable is needed!

[1] https://www.synopsys.com/dw/ipdir.php?ds=arc_iot_development_kit
[2] https://www.synopsys.com/dw/doc.php/ds/cc/iot_dev_kit.pdf

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

1 files changed, 84 insertions, 0 deletions

diff --git a/include/configs/iot_devkit.h b/include/configs/iot_devkit.h
new file mode 100644
index 00000000000..4ffe1141d92
--- /dev/null
+++ b/include/configs/iot_devkit.h
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 Synopsys, Inc. All rights reserved.
+ */
+
+#ifndef _CONFIG_IOT_DEVKIT_H_
+#define _CONFIG_IOT_DEVKIT_H_
+
+#include <linux/sizes.h>
+
+/*
+ *                         MEMORY MAP
+ *
+ * eFlash: 0x0000_0000 - 0x0008_0000 (512K)
+ *   ICCM: 0x2000_0000 - 0x2004_0000 (256K)
+ *   SRAM: 0x3000_0000 - 0x3002_0000 (128K)
+ *   DCCM: 0x8000_0000 - 0x8002_0000 (128K)
+ *     Note: only data goes here, as IFQ cannot fetch instructions from DCCM
+ *
+ *
+ *                         RAM PARTITIONING
+ *
+ *   +-----------+----------+---------------------+-------------+
+ *   | <-- Stack |  .data   | Malloc              | Environment |
+ *   +-----------+----------+---------------------+-------------+
+ *   :           :          :                     :\___________/
+ *   :           :          :                     :      |
+ *   :           :          :                     :     CONFIG_ENV_SIZE
+ *   :           :           \____________________/
+ *   :           :                     |
+ *   :           :                    CONFIG_SYS_MALLOC_LEN
+ *   :           :
+ *   :          Specified explicitly by CONFIG_SYS_INIT_SP_ADDR
+ *   :
+ *  Specified explicitly by CONFIG_SYS_SDRAM_BASE
+ *
+ *  NOTES:
+ *    - Stack starts from CONFIG_SYS_INIT_SP_ADDR and grows down,
+ *      i.e. towards CONFIG_SYS_SDRAM_BASE but nothing stops it from crossing
+ *      that CONFIG_SYS_SDRAM_BASE in which case data won't be really saved on
+ *      stack any longer and values popped from stack will contain garbage
+ *      leading to unexpected behavior, typically but not limited to:
+ *        - "Returning" back to bogus caller function
+ *        - Reading data from weird addresses
+ */
+
+#define CONFIG_SYS_MONITOR_BASE		CONFIG_SYS_TEXT_BASE
+
+#define SRAM_BASE			0x30000000
+#define SRAM_SIZE			SZ_128K
+
+#define DCCM_BASE			0x80000000
+#define DCCM_SIZE			SZ_128K
+
+#define CONFIG_SYS_SDRAM_BASE		DCCM_BASE
+#define CONFIG_SYS_SDRAM_SIZE		DCCM_SIZE
+
+#define CONFIG_SYS_INIT_SP_ADDR		(CONFIG_SYS_SDRAM_BASE + SZ_32K)
+
+#define CONFIG_SYS_MALLOC_LEN		SZ_64K
+#define CONFIG_SYS_BOOTM_LEN		SZ_128K
+#define CONFIG_SYS_LOAD_ADDR		SRAM_BASE
+
+#define ROM_BASE			CONFIG_SYS_MONITOR_BASE
+#define ROM_SIZE			SZ_256K
+
+#define RAM_DATA_BASE			CONFIG_SYS_INIT_SP_ADDR
+#define RAM_DATA_SIZE			CONFIG_SYS_SDRAM_SIZE - \
+					(CONFIG_SYS_INIT_SP_ADDR - \
+					CONFIG_SYS_SDRAM_BASE) - \
+					CONFIG_SYS_MALLOC_LEN - \
+					CONFIG_ENV_SIZE
+
+/* Required by DW MMC driver */
+#define CONFIG_BOUNCE_BUFFER
+
+/*
+ * Environment
+ */
+#define CONFIG_ENV_SIZE			SZ_4K
+#define CONFIG_BOOTFILE			"app.bin"
+#define CONFIG_LOADADDR			CONFIG_SYS_LOAD_ADDR
+
+#endif /* _CONFIG_IOT_DEVKIT_H_ */