stm32mp1: move the MCU security management to BL32

Change the MCKPROT control management. Now, the MCU subsystem
is done in the BL32 using the dedicated clock function.

Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Change-Id: I59f90ace750aa93f674389f881e2fe14ad334a72
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/tf-a/+/188431


Reviewed-by: CITOOLS <smet-aci-reviews@lists.codex.cro.st.com>
Reviewed-by: Gabriel FERNANDEZ <gabriel.fernandez@st.com>
Reviewed-by: Etienne CARRIERE <etienne.carriere@st.com>
Reviewed-by: Yann GAUTIER <yann.gautier@st.com>

plat/st/stm32mp1/bl2_plat_setup.c

@@ -380,9 +380,6 @@ void bl2_el3_plat_arch_setup(void)
 		mmio_clrbits_32(rcc_base + RCC_BDCR, RCC_BDCR_VSWRST);
 	}
 
-	/* Disable MCKPROT */
-	mmio_clrbits_32(rcc_base + RCC_TZCR, RCC_TZCR_MCKPROT);
-
 	/* Enable BKP Register protection */
 	mmio_write_32(TAMP_SMCR,
 		      TAMP_BKP_SEC_NUMBER << TAMP_BKP_SEC_WDPROT_SHIFT |

plat/st/stm32mp1/sp_min/sp_min_setup.c

@@ -535,6 +535,9 @@ static void init_sec_peripherals(void)
 	uint32_t active_conf = 0;
 	int ret;
 
+	/* Disable MCU subsystem protection */
+	stm32mp1_clk_mcuss_protect(false);
+
 	/* Init rtc driver */
 	ret = stm32_rtc_init();
 	if (ret < 0) {