amlogic: Move MHU code to common directory

The MHU code is shared between all the supported platforms. Move it to
the common directory instead.
Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Change-Id: Iaf53122866eae85c13f772927d16836dcfa877a3

plat/amlogic/gxbb/gxbb_mhu.c

-/*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <platform_def.h>
-
-#include <lib/bakery_lock.h>
-#include <lib/mmio.h>
-
-static DEFINE_BAKERY_LOCK(mhu_lock);
-
-void mhu_secure_message_start(void)
-{
-	bakery_lock_get(&mhu_lock);
-
-	while (mmio_read_32(GXBB_HIU_MAILBOX_STAT_3) != 0)
-		;
-}
-
-void mhu_secure_message_send(uint32_t msg)
-{
-	mmio_write_32(GXBB_HIU_MAILBOX_SET_3, msg);
-
-	while (mmio_read_32(GXBB_HIU_MAILBOX_STAT_3) != 0)
-		;
-}
-
-uint32_t mhu_secure_message_wait(void)
-{
-	uint32_t val;
-
-	do {
-		val = mmio_read_32(GXBB_HIU_MAILBOX_STAT_0);
-	} while (val == 0);
-
-	return val;
-}
-
-void mhu_secure_message_end(void)
-{
-	mmio_write_32(GXBB_HIU_MAILBOX_CLR_0, 0xFFFFFFFF);
-
-	bakery_lock_release(&mhu_lock);
-}
-
-void mhu_secure_init(void)
-{
-	bakery_lock_init(&mhu_lock);
-
-	mmio_write_32(GXBB_HIU_MAILBOX_CLR_3, 0xFFFFFFFF);
-}

plat/amlogic/gxbb/platform.mk

@@ -29,7 +29,7 @@ BL31_SOURCES		+=	lib/cpus/aarch64/cortex_a53.S		\
 				${AML_PLAT_COMMON}/aarch64/aml_helpers.S	\
 				${AML_PLAT_SOC}/gxbb_bl31_setup.c	\
 				${AML_PLAT_COMMON}/aml_efuse.c		\
-				${AML_PLAT_SOC}/gxbb_mhu.c		\
+				${AML_PLAT_COMMON}/aml_mhu.c		\
 				${AML_PLAT_SOC}/gxbb_pm.c		\
 				${AML_PLAT_COMMON}/aml_scpi.c		\
 				${AML_PLAT_SOC}/gxbb_sip_svc.c		\

plat/amlogic/gxl/platform.mk

@@ -32,7 +32,7 @@ BL31_SOURCES		+=	lib/cpus/aarch64/cortex_a53.S		\
 				${AML_PLAT_COMMON}/aarch64/aml_helpers.S	\
 				${AML_PLAT_SOC}/gxl_bl31_setup.c	\
 				${AML_PLAT_COMMON}/aml_efuse.c		\
-				${AML_PLAT_SOC}/gxl_mhu.c		\
+				${AML_PLAT_COMMON}/aml_mhu.c		\
 				${AML_PLAT_SOC}/gxl_pm.c		\
 				${AML_PLAT_COMMON}/aml_scpi.c		\
 				${AML_PLAT_SOC}/gxl_sip_svc.c		\