plat: marvell: Add support for Armada-37xx SoC platform

Add supprot for Marvell platforms based on Armada-37xx SoC.
This includes support for the official Armada-3720 modular
development board and EspressoBin community board.
The Armada-37xx SoC contains dual Cortex-A53 Application CPU,
single secure CPU (Cortex-M3) and the following interfaces:
- SATA 3.0
- USB 3.0 and USB 2.0
- PCIe
- SDIO (supports boot from eMMC)
- SPI
- UART
- I2c
- Gigabit Ethernet

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
diff --git a/plat/marvell/a3700/common/a3700_sip_svc.c b/plat/marvell/a3700/common/a3700_sip_svc.c
new file mode 100644
index 0000000..88d1fc2
--- /dev/null
+++ b/plat/marvell/a3700/common/a3700_sip_svc.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2018 Marvell International Ltd.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ * https://spdx.org/licenses
+ */
+
+#include <debug.h>
+#include <marvell_plat_priv.h>
+#include <plat_marvell.h>
+#include <runtime_svc.h>
+#include <smccc.h>
+#include "comphy/phy-comphy-3700.h"
+
+/* Comphy related FID's */
+#define MV_SIP_COMPHY_POWER_ON	0x82000001
+#define MV_SIP_COMPHY_POWER_OFF	0x82000002
+#define MV_SIP_COMPHY_PLL_LOCK	0x82000003
+
+/* Miscellaneous FID's' */
+#define MV_SIP_DRAM_SIZE	0x82000010
+
+/* This macro is used to identify COMPHY related calls from SMC function ID */
+#define is_comphy_fid(fid)	\
+	((fid) >= MV_SIP_COMPHY_POWER_ON && (fid) <= MV_SIP_COMPHY_PLL_LOCK)
+
+uintptr_t mrvl_sip_smc_handler(uint32_t smc_fid,
+			       u_register_t x1,
+			       u_register_t x2,
+			       u_register_t x3,
+			       u_register_t x4,
+			       void *cookie,
+			       void *handle,
+			       u_register_t flags)
+{
+	u_register_t ret;
+
+	VERBOSE("%s: got SMC (0x%x) x1 0x%lx, x2 0x%lx\n",
+		__func__, smc_fid, x1, x2);
+	if (is_comphy_fid(smc_fid)) {
+		if (x1 >= MAX_LANE_NR) {
+			ERROR("%s: Wrong smc (0x%x) lane nr: %lx\n",
+			      __func__, smc_fid, x2);
+			SMC_RET1(handle, SMC_UNK);
+		}
+	}
+
+	switch (smc_fid) {
+	/* Comphy related FID's */
+	case MV_SIP_COMPHY_POWER_ON:
+		/* x1: comphy_index, x2: comphy_mode */
+		ret = mvebu_3700_comphy_power_on(x1, x2);
+		SMC_RET1(handle, ret);
+	case MV_SIP_COMPHY_POWER_OFF:
+		/* x1: comphy_index, x2: comphy_mode */
+		ret = mvebu_3700_comphy_power_off(x1, x2);
+		SMC_RET1(handle, ret);
+	case MV_SIP_COMPHY_PLL_LOCK:
+		/* x1: comphy_index, x2: comphy_mode */
+		ret = mvebu_3700_comphy_is_pll_locked(x1, x2);
+		SMC_RET1(handle, ret);
+	/* Miscellaneous FID's' */
+	case MV_SIP_DRAM_SIZE:
+		/* x1:  ap_base_addr */
+		ret = mvebu_get_dram_size(MVEBU_REGS_BASE);
+		SMC_RET1(handle, ret);
+
+	default:
+		ERROR("%s: unhandled SMC (0x%x)\n", __func__, smc_fid);
+		SMC_RET1(handle, SMC_UNK);
+	}
+}
+
+/* Define a runtime service descriptor for fast SMC calls */
+DECLARE_RT_SVC(
+	marvell_sip_svc,
+	OEN_SIP_START,
+	OEN_SIP_END,
+	SMC_TYPE_FAST,
+	NULL,
+	mrvl_sip_smc_handler
+);