mach-stm32: Factorize MPU's region config for STM32 SoCs

MPU's region setup can be factorized between STM32F4/F7/H7 SoCs family
and used a common MPU's region config.

Only one exception for STM32H7 which doesn't have device area
located at 0xA000 0000.

For STM32F4, configure_clocks() need to be moved from arch_cpu_init()
to board_early_init_f().

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Vikas Manocha <vikas.manocha@st.com>

arch/arm/mach-stm32/Makefile

@@ -4,7 +4,6 @@
 #
 # SPDX-License-Identifier:	GPL-2.0+
 #
-
+obj-y += soc.o
 obj-$(CONFIG_STM32F4) += stm32f4/
 obj-$(CONFIG_STM32F7) += stm32f7/
-obj-$(CONFIG_STM32H7) += stm32h7/

arch/arm/mach-stm32/soc.c

@@ -9,11 +9,6 @@
 #include <asm/io.h>
 #include <asm/armv7m_mpu.h>
 
-u32 get_cpu_rev(void)
-{
-	return 0;
-}
-
 int arch_cpu_init(void)
 {
 	int i;
@@ -30,11 +25,11 @@ int arch_cpu_init(void)
 		{ 0x00000000, REGION_0, XN_DIS, PRIV_RW_USR_RW,
 		O_I_WB_RD_WR_ALLOC, REGION_4GB },
 
-		/* Code area, executable & strongly ordered */
-		{ 0xD0000000, REGION_1, XN_EN, PRIV_RW_USR_RW,
-		STRONG_ORDER, REGION_8MB },
+		/* armv7m code area */
+		{ 0x00000000, REGION_1, XN_DIS, PRIV_RW_USR_RW,
+		STRONG_ORDER, REGION_512MB },
 
-		/* Device area in all H7 : Not executable */
+		/* Device area : Not executable */
 		{ 0x40000000, REGION_2, XN_EN, PRIV_RW_USR_RW,
 		DEVICE_NON_SHARED, REGION_512MB },
 
@@ -42,8 +37,14 @@ int arch_cpu_init(void)
 		 * Armv7m fixed configuration: strongly ordered & not
 		 * executable, not cacheable
 		 */
-		{ 0xE0000000, REGION_4, XN_EN, PRIV_RW_USR_RW,
+		{ 0xE0000000, REGION_3, XN_EN, PRIV_RW_USR_RW,
 		STRONG_ORDER, REGION_512MB },
+
+#if !defined(CONFIG_STM32H7)
+		/* Device area : Not executable */
+		{ 0xA0000000, REGION_4, XN_EN, PRIV_RW_USR_RW,
+		DEVICE_NON_SHARED, REGION_512MB },
+#endif
 	};
 
 	disable_mpu();
@@ -53,7 +54,3 @@ int arch_cpu_init(void)
 
 	return 0;
 }
-
-void s_init(void)
-{
-}

arch/arm/mach-stm32/stm32f4/Makefile

@@ -8,4 +8,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y += soc.o clock.o timer.o
+obj-y += clock.o timer.o

arch/arm/mach-stm32/stm32f4/soc.c

@@ -1,41 +0,0 @@
-/*
- * (C) Copyright 2015
- * Kamil Lulko, <kamil.lulko@gmail.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#include <common.h>
-#include <asm/io.h>
-#include <asm/armv7m_mpu.h>
-#include <asm/arch/stm32.h>
-
-u32 get_cpu_rev(void)
-{
-	return 0;
-}
-
-int arch_cpu_init(void)
-{
-	struct mpu_region_config stm32_region_config[] = {
-		{ 0x00000000, REGION_0, XN_DIS, PRIV_RW_USR_RW,
-		STRONG_ORDER, REGION_4GB },
-	};
-	int i;
-
-	configure_clocks();
-	/*
-	 * Configure the memory protection unit (MPU) to allow full access to
-	 * the whole 4GB address space.
-	 */
-	disable_mpu();
-	for (i = 0; i < ARRAY_SIZE(stm32_region_config); i++)
-		mpu_config(&stm32_region_config[i]);
-	enable_mpu();
-
-	return 0;
-}
-
-void s_init(void)
-{
-}

arch/arm/mach-stm32/stm32f7/Makefile

@@ -5,4 +5,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y += timer.o soc.o
+obj-y += timer.o

arch/arm/mach-stm32/stm32f7/soc.c

@@ -1,49 +0,0 @@
-/*
- * (C) Copyright 2015
- * Kamil Lulko, <kamil.lulko@gmail.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#include <common.h>
-#include <asm/io.h>
-#include <asm/armv7m_mpu.h>
-#include <asm/arch/stm32.h>
-
-u32 get_cpu_rev(void)
-{
-	return 0;
-}
-
-int arch_cpu_init(void)
-{
-	int i;
-
-	struct mpu_region_config stm32_region_config[] = {
-		{ 0x00000000, REGION_0, XN_DIS, PRIV_RW_USR_RW,
-		O_I_WB_RD_WR_ALLOC, REGION_4GB },
-
-		{ 0x00000000, REGION_1, XN_DIS, PRIV_RW_USR_RW,
-		STRONG_ORDER, REGION_512MB },
-
-		{ 0x40000000, REGION_2, XN_EN, PRIV_RW_USR_RW,
-		DEVICE_NON_SHARED, REGION_512MB },
-
-		{ 0xA0000000, REGION_3, XN_EN, PRIV_RW_USR_RW,
-		DEVICE_NON_SHARED, REGION_512MB },
-
-		{ 0xE0000000, REGION_4, XN_EN, PRIV_RW_USR_RW,
-		STRONG_ORDER, REGION_512MB },
-	};
-
-	disable_mpu();
-	for (i = 0; i < ARRAY_SIZE(stm32_region_config); i++)
-		mpu_config(&stm32_region_config[i]);
-	enable_mpu();
-
-	return 0;
-}
-
-void s_init(void)
-{
-}

arch/arm/mach-stm32/stm32h7/Makefile

@@ -1,8 +0,0 @@
-#
-# Copyright (C) 2017, STMicroelectronics - All Rights Reserved
-# Author(s): Patrice CHOTARD, <patrice.chotard@st.com> for STMicroelectronics.
-#
-# SPDX-License-Identifier:	GPL-2.0+
-#
-
-obj-y += soc.o

board/st/stm32f429-discovery/stm32f429-discovery.c

@@ -294,6 +294,8 @@ int board_early_init_f(void)
 {
 	int res;
 
+	configure_clocks();
+
 	res = uart_setup_gpio();
 	if (res)
 		return res;