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-rw-r--r--plat/amlogic/common/aml_mhu.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/plat/amlogic/common/aml_mhu.c b/plat/amlogic/common/aml_mhu.c
new file mode 100644
index 0000000..001686a
--- /dev/null
+++ b/plat/amlogic/common/aml_mhu.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <lib/bakery_lock.h>
+#include <lib/mmio.h>
+#include <platform_def.h>
+
+static DEFINE_BAKERY_LOCK(mhu_lock);
+
+void aml_mhu_secure_message_start(void)
+{
+ bakery_lock_get(&mhu_lock);
+
+ while (mmio_read_32(AML_HIU_MAILBOX_STAT_3) != 0)
+ ;
+}
+
+void aml_mhu_secure_message_send(uint32_t msg)
+{
+ mmio_write_32(AML_HIU_MAILBOX_SET_3, msg);
+
+ while (mmio_read_32(AML_HIU_MAILBOX_STAT_3) != 0)
+ ;
+}
+
+uint32_t aml_mhu_secure_message_wait(void)
+{
+ uint32_t val;
+
+ do {
+ val = mmio_read_32(AML_HIU_MAILBOX_STAT_0);
+ } while (val == 0);
+
+ return val;
+}
+
+void aml_mhu_secure_message_end(void)
+{
+ mmio_write_32(AML_HIU_MAILBOX_CLR_0, 0xFFFFFFFF);
+
+ bakery_lock_release(&mhu_lock);
+}
+
+void aml_mhu_secure_init(void)
+{
+ bakery_lock_init(&mhu_lock);
+
+ mmio_write_32(AML_HIU_MAILBOX_CLR_3, 0xFFFFFFFF);
+}