stm32mp1: add a function to get non-secure DDR size
This function gets the DDR size from DT, and withdraws (if defined) the
sizes of secure DDR and shared memory areas.
This function also checks DT values fits the default DDR range.
This non-secure memory is available for BL33 and non-secure OS.
Change-Id: I162ae5e990a0f9b6b7d07e539de029f1d61a391b
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/plat/st/stm32mp1/stm32mp1_private.c b/plat/st/stm32mp1/stm32mp1_private.c
index e2dcd2a..ac45195 100644
--- a/plat/st/stm32mp1/stm32mp1_private.c
+++ b/plat/st/stm32mp1/stm32mp1_private.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -365,3 +365,24 @@
return BSEC_OK;
}
#endif
+
+/* Get the non-secure DDR size */
+uint32_t stm32mp_get_ddr_ns_size(void)
+{
+ static uint32_t ddr_ns_size;
+ uint32_t ddr_size;
+
+ if (ddr_ns_size != 0U) {
+ return ddr_ns_size;
+ }
+
+ ddr_size = dt_get_ddr_size();
+ if ((ddr_size <= (STM32MP_DDR_S_SIZE + STM32MP_DDR_SHMEM_SIZE)) ||
+ (ddr_size > STM32MP_DDR_MAX_SIZE)) {
+ panic();
+ }
+
+ ddr_ns_size = ddr_size - (STM32MP_DDR_S_SIZE + STM32MP_DDR_SHMEM_SIZE);
+
+ return ddr_ns_size;
+}