ARM: Add initial STM32MP1 support

This adds initial STMicroelectronics MP1 support along with support
for the DK2 devel board. Only very basic support:

- UART
- SDRAM memory base/size
- No 1st stage support

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

3 files changed, 38 insertions, 0 deletions

diff --git a/arch/arm/boards/stm32mp157c-dk2/Makefile b/arch/arm/boards/stm32mp157c-dk2/Makefile
new file mode 100644
index 0000000000..092c31d6b2
--- /dev/null
+++ b/arch/arm/boards/stm32mp157c-dk2/Makefile
@@ -0,0 +1,2 @@
+lwl-y += lowlevel.o
+obj-y += board.o
diff --git a/arch/arm/boards/stm32mp157c-dk2/board.c b/arch/arm/boards/stm32mp157c-dk2/board.c
new file mode 100644
index 0000000000..cbfe21db6a
--- /dev/null
+++ b/arch/arm/boards/stm32mp157c-dk2/board.c
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include <common.h>
+#include <linux/sizes.h>
+#include <init.h>
+#include <asm/memory.h>
+#include <mach/stm32.h>
+
+static int dk2_postcore_init(void)
+{
+	if (!of_machine_is_compatible("st,stm32mp157c-dk2"))
+		return 0;
+
+	arm_add_mem_device("ram0", STM32_DDR_BASE, SZ_512M);
+
+	return 0;
+}
+mem_initcall(dk2_postcore_init);
diff --git a/arch/arm/boards/stm32mp157c-dk2/lowlevel.c b/arch/arm/boards/stm32mp157c-dk2/lowlevel.c
new file mode 100644
index 0000000000..b8e5959bef
--- /dev/null
+++ b/arch/arm/boards/stm32mp157c-dk2/lowlevel.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include <common.h>
+#include <asm/barebox-arm-head.h>
+#include <asm/barebox-arm.h>
+#include <mach/stm32.h>
+#include <debug_ll.h>
+
+extern char __dtb_stm32mp157c_dk2_start[];
+
+ENTRY_FUNCTION(start_stm32mp157c_dk2, r0, r1, r2)
+{
+	void *fdt;
+
+	arm_cpu_lowlevel_init();
+
+	fdt = __dtb_stm32mp157c_dk2_start + get_runtime_offset();
+
+	barebox_arm_entry(STM32_DDR_BASE, SZ_512M, fdt);
+}