From 4d65df50de18c375dcaa8193806f5cbd81d1d22c Mon Sep 17 00:00:00 2001
From: Jon Medhurst <tixy@linaro.org>
Date: Sun, 9 Feb 2014 14:16:27 +0000
Subject: [PATCH] juno: Add MHU interface
Signed-off-by: Jon Medhurst <tixy@linaro.org>
---
plat/juno/mhu.c | 92 ++++++++++++++++++++++++++++++++++++++++++++
plat/juno/mhu.h | 44 +++++++++++++++++++++
plat/juno/platform.h | 1 +
3 files changed, 137 insertions(+)
create mode 100644 plat/juno/mhu.c
create mode 100644 plat/juno/mhu.h
diff --git a/plat/juno/mhu.c b/plat/juno/mhu.c
new file mode 100644
index 000000000..4d528fb09
--- /dev/null
+++ b/plat/juno/mhu.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <arch_helpers.h>
+#include <bakery_lock.h>
+#include <mhu.h>
+#include <platform.h>
+
+/* SCP MHU secure channel registers */
+#define SCP_INTR_S_STAT 0x200
+#define SCP_INTR_S_SET 0x208
+#define SCP_INTR_S_CLEAR 0x210
+
+/* CPU MHU secure channel registers */
+#define CPU_INTR_S_STAT 0x300
+#define CPU_INTR_S_SET 0x308
+#define CPU_INTR_S_CLEAR 0x310
+
+
+static bakery_lock mhu_secure_lock __attribute__ ((section("tzfw_coherent_mem")));
+
+
+void mhu_secure_message_start(void)
+{
+ bakery_lock_get(read_mpidr(), &mhu_secure_lock);
+
+ /* Make sure any previous command has finished */
+ while (mmio_read_32(MHU_BASE + CPU_INTR_S_STAT) != 0)
+ ;
+}
+
+void mhu_secure_message_send(uint32_t command)
+{
+ /* Send command to SCP */
+ mmio_write_32(MHU_BASE + CPU_INTR_S_SET, command);
+}
+
+uint32_t mhu_secure_message_wait(void)
+{
+ /* Wait for response from SCP */
+ uint32_t response;
+ while (!(response = mmio_read_32(MHU_BASE + SCP_INTR_S_STAT)))
+ ;
+
+ return response;
+}
+
+void mhu_secure_message_end(void)
+{
+ /* Clear any response we got by writing all ones to the CLEAR register */
+ mmio_write_32(MHU_BASE + SCP_INTR_S_CLEAR, 0xffffffffu);
+
+ bakery_lock_release(read_mpidr(), &mhu_secure_lock);
+}
+
+void mhu_secure_init(void)
+{
+ bakery_lock_init(&mhu_secure_lock);
+
+ /*
+ * Clear the CPU's INTR register to make sure we don't see a stale
+ * or garbage value and think it's a message we've already sent.
+ */
+ mmio_write_32(MHU_BASE + CPU_INTR_S_CLEAR, 0xffffffffu);
+}
diff --git a/plat/juno/mhu.h b/plat/juno/mhu.h
new file mode 100644
index 000000000..eeb97e171
--- /dev/null
+++ b/plat/juno/mhu.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __MHU_H__
+#define __MHU_H__
+
+#include <stdint.h>
+#include <stddef.h>
+
+extern void mhu_secure_message_start(void);
+extern void mhu_secure_message_send(uint32_t command);
+extern uint32_t mhu_secure_message_wait(void);
+extern void mhu_secure_message_end(void);
+
+extern void mhu_secure_init(void);
+
+#endif /* __MHU_H__ */
diff --git a/plat/juno/platform.h b/plat/juno/platform.h
index 1a572525e..c85b270a9 100644
--- a/plat/juno/platform.h
+++ b/plat/juno/platform.h
@@ -111,6 +111,7 @@
#define DEVICE0_SIZE 0x0e000000
#define CSS_NIC400_BASE 0x2a000000
#define TZC400_BASE 0x2a4a0000
+#define MHU_BASE 0x2b1f0000
#define NSRAM_BASE 0x2e000000
#define NSRAM_SIZE 0x00008000
--
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