stm32mp1: check if the SoC is single core

Among the variants of STM32MP, the STM32MP151 is a single Cortex-A7 chip.
A function is added to check the part number of the SoC.
If it corresponds to STM32MP151A or STM32MP151C, then the chip has a single
Cortex-A7.

Change-Id: Icac2015c5d03ce0bcb8e99bbaf1ec8ada34be49c
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com>
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>

plat/st/common/include/stm32mp_common.h

@@ -16,6 +16,8 @@
 void stm32mp_save_boot_ctx_address(uintptr_t address);
 uintptr_t stm32mp_get_boot_ctx_address(void);
 
+bool stm32mp_is_single_core(void);
+
 /* Return the base address of the DDR controller */
 uintptr_t stm32mp_ddrctrl_base(void);
 

plat/st/stm32mp1/stm32mp1_private.c

@@ -254,6 +254,30 @@ void stm32mp_print_boardinfo(void)
 	}
 }
 
+/* Return true when SoC provides a single Cortex-A7 core, and false otherwise */
+bool stm32mp_is_single_core(void)
+{
+	uint32_t part_number;
+	bool ret = false;
+
+	if (get_part_number(&part_number) < 0) {
+		ERROR("Invalid part number, assume single core chip");
+		return true;
+	}
+
+	switch (part_number) {
+	case STM32MP151A_PART_NB:
+	case STM32MP151C_PART_NB:
+		ret = true;
+		break;
+
+	default:
+		break;
+	}
+
+	return ret;
+}
+
 uint32_t stm32_iwdg_get_instance(uintptr_t base)
 {
 	switch (base) {