feat(tc): add RSS SDS region right after SCMI payload
Add a second SDS region on the TC platform for communication with RSS.
RSS needs to share data with AP during early boot over shared memory
to support DPE. Reserve a memory region right after the SCMI secure
payload areas from unused memory.
Change-Id: I3a3a6ea5ce76531595c88754418602133a283c42
Signed-off-by: David Vincze <david.vincze@arm.com>
diff --git a/include/plat/arm/css/common/css_def.h b/include/plat/arm/css/common/css_def.h
index f87f857..0aea548 100644
--- a/include/plat/arm/css/common/css_def.h
+++ b/include/plat/arm/css/common/css_def.h
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2015-2023, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2024, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -75,6 +75,7 @@
* The SCMI Channel is placed right after the SDS region
*/
#define CSS_SCMI_PAYLOAD_BASE (PLAT_ARM_SDS_MEM_BASE + PLAT_ARM_SDS_MEM_SIZE_MAX)
+#define CSS_SCMI_PAYLOAD_SIZE_MAX 0x100 /* 2x128 bytes for bidirectional communication */
#define CSS_SCMI_MHU_DB_REG_OFF MHU_CPU_INTR_S_SET_OFFSET
/* Trusted mailbox base address common to all CSS */
diff --git a/plat/arm/board/tc/include/platform_def.h b/plat/arm/board/tc/include/platform_def.h
index 59fff6e..867750e 100644
--- a/plat/arm/board/tc/include/platform_def.h
+++ b/plat/arm/board/tc/include/platform_def.h
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2020-2023, Arm Limited. All rights reserved.
+ * Copyright (c) 2020-2024, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -240,6 +240,17 @@
#define PLAT_ARM_SCMI_CHANNEL_COUNT 1
+/* Index of SDS region used in the communication with SCP */
+#define SDS_SCP_AP_REGION_ID U(0)
+/* Index of SDS region used in the communication with RSS */
+#define SDS_RSS_AP_REGION_ID U(1)
+/*
+ * Memory region for RSS's shared data storage (SDS)
+ * It is placed right after the SCMI payload area.
+ */
+#define PLAT_ARM_RSS_AP_SDS_MEM_BASE (CSS_SCMI_PAYLOAD_BASE + \
+ CSS_SCMI_PAYLOAD_SIZE_MAX)
+
#define PLAT_ARM_CLUSTER_COUNT U(1)
#define PLAT_MAX_CPUS_PER_CLUSTER U(8)
#define PLAT_MAX_PE_PER_CPU U(1)
diff --git a/plat/arm/board/tc/tc_plat.c b/plat/arm/board/tc/tc_plat.c
index 766bfb5..27d4b11 100644
--- a/plat/arm/board/tc/tc_plat.c
+++ b/plat/arm/board/tc/tc_plat.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2020-2023, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020-2024, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -12,6 +12,8 @@
#include <common/bl_common.h>
#include <common/debug.h>
#include <drivers/arm/ccn.h>
+#include <drivers/arm/css/sds.h>
+#include <lib/utils_def.h>
#include <plat/arm/common/plat_arm.h>
#include <plat/common/platform.h>
#include <drivers/arm/sbsa.h>
@@ -159,3 +161,15 @@
{
sbsa_wdog_refresh(SBSA_SECURE_WDOG_REFRESH_BASE);
}
+
+static sds_region_desc_t tc_sds_regions[] = {
+ { .base = PLAT_ARM_SDS_MEM_BASE },
+ { .base = PLAT_ARM_RSS_AP_SDS_MEM_BASE },
+};
+
+sds_region_desc_t *plat_sds_get_regions(unsigned int *region_count)
+{
+ *region_count = ARRAY_SIZE(tc_sds_regions);
+
+ return tc_sds_regions;
+}