feat(st-reset): add system reset management

Add the system reset management into the stm32mp
reset driver.

Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Change-Id: I748f10de2398e1323160f479f99e92abd2f65dca

drivers/st/reset/stm32mp1_reset.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2019, STMicroelectronics - All Rights Reserved
+ * Copyright (c) 2018-2024, STMicroelectronics - All Rights Reserved
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -7,8 +7,6 @@
 #include <errno.h>
 #include <limits.h>
 
-#include <platform_def.h>
-
 #include <common/bl_common.h>
 #include <common/debug.h>
 #include <drivers/delay_timer.h>
@@ -16,6 +14,8 @@
 #include <lib/mmio.h>
 #include <lib/utils_def.h>
 
+#include <platform_def.h>
+
 static uint32_t id2reg_offset(unsigned int reset_id)
 {
 	return ((reset_id & GENMASK(31, 5)) >> 5) * sizeof(uint32_t);
@@ -67,3 +67,16 @@ int stm32mp_reset_deassert(uint32_t id, unsigned int to_us)
 
 	return 0;
 }
+
+void __dead2 stm32mp_system_reset(void)
+{
+	uintptr_t rcc_base = stm32mp_rcc_base();
+
+	mmio_setbits_32(rcc_base + RCC_MP_GRSTCSETR,
+			RCC_MP_GRSTCSETR_MPSYSRST);
+
+	/* Loop in case system reset is not immediately caught */
+	while (true) {
+		wfi();
+	}
+}

include/drivers/st/stm32mp_reset.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2019, STMicroelectronics - All Rights Reserved
+ * Copyright (c) 2018-2024, STMicroelectronics - All Rights Reserved
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -47,4 +47,9 @@ static inline void stm32mp_reset_release(uint32_t reset_id)
 	(void)stm32mp_reset_deassert(reset_id, 0U);
 }
 
+/*
+ * Manage system reset control
+ */
+void __dead2 stm32mp_system_reset(void);
+
 #endif /* STM32MP_RESET_H */

plat/st/stm32mp1/stm32mp1_pm.c

@@ -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
  */
@@ -13,6 +13,7 @@
 #include <drivers/arm/gic_common.h>
 #include <drivers/arm/gicv2.h>
 #include <drivers/clk.h>
+#include <drivers/st/stm32mp_reset.h>
 #include <dt-bindings/clock/stm32mp1-clks.h>
 #include <lib/mmio.h>
 #include <lib/psci/psci.h>
@@ -149,13 +150,7 @@ static void __dead2 stm32_system_off(void)
 
 static void __dead2 stm32_system_reset(void)
 {
-	mmio_setbits_32(stm32mp_rcc_base() + RCC_MP_GRSTCSETR,
-			RCC_MP_GRSTCSETR_MPSYSRST);
-
-	/* Loop in case system reset is not immediately caught */
-	for ( ; ; ) {
-		;
-	}
+	stm32mp_system_reset();
 }
 
 static int stm32_validate_power_state(unsigned int power_state,