board: st: add generic board for STM32MP1 family

Add first support for STM32MP157C-ED1 board with "Basic" boot chain
1/ Boot Rom: load SPL with STM32 image header in SYSRAM
2/ SPL: power up and initialize the DDR and load U-Boot image
        from SDCARD in DDR
3/ U-Boot: search and load extlinux.conf in SDCARD
           (DISTRO activated)

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

7 files changed, 358 insertions, 0 deletions

diff --git a/board/st/stm32mp1/Kconfig b/board/st/stm32mp1/Kconfig
new file mode 100644
index 00000000000..5ab94151a9a
--- /dev/null
+++ b/board/st/stm32mp1/Kconfig
@@ -0,0 +1,12 @@
+if TARGET_STM32MP1
+
+config SYS_BOARD
+	default "stm32mp1"
+
+config SYS_VENDOR
+	default "st"
+
+config SYS_CONFIG_NAME
+	default "stm32mp1"
+
+endif
diff --git a/board/st/stm32mp1/MAINTAINERS b/board/st/stm32mp1/MAINTAINERS
new file mode 100644
index 00000000000..65266bce3f1
--- /dev/null
+++ b/board/st/stm32mp1/MAINTAINERS
@@ -0,0 +1,7 @@
+STM32MP1 BOARD
+M:	Patrick Delaunay <patrick.delaunay@st.com>
+S:	Maintained
+F:	board/st/stm32mp1
+F:	include/configs/stm32mp1.h
+F:	configs/stm32mp15_basic_defconfig
+F:	arch/arm/dts/stm32mp157*
diff --git a/board/st/stm32mp1/Makefile b/board/st/stm32mp1/Makefile
new file mode 100644
index 00000000000..eaf45b77871
--- /dev/null
+++ b/board/st/stm32mp1/Makefile
@@ -0,0 +1,13 @@
+#
+# Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+#
+# SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
+#
+
+ifdef CONFIG_SPL_BUILD
+obj-y += spl.o
+else
+obj-y += stm32mp1.o
+endif
+
+obj-y += board.o
diff --git a/board/st/stm32mp1/README b/board/st/stm32mp1/README
new file mode 100644
index 00000000000..4adc978d1ea
--- /dev/null
+++ b/board/st/stm32mp1/README
@@ -0,0 +1,191 @@
+#
+# Copyright (C) 2018 STMicroelectronics - All Rights Reserved
+#
+# SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
+#
+
+U-Boot on STMicroelectronics STM32MP1
+======================================
+
+1. Summary
+==========
+This is a quick instruction for setup stm32mp1 boards.
+
+2. Supported devices
+====================
+U-Boot supports one STMP32MP1 SoCs: STM32MP157
+
+The STM32MP157 is a Cortex-A MPU aimed at various applications.
+It features:
+- Dual core Cortex-A7 application core
+- 2D/3D image composition with GPU
+- Standard memories interface support
+- Standard connectivity, widely inherited from the STM32 MCU family
+- Comprehensive security support
+
+Everything is supported in Linux but U-Boot is limited to:
+1. UART
+2. SDCard/MMC controller (SDMMC)
+
+And the necessary drivers
+1. I2C
+2. STPMU1
+3. Clock, Reset
+
+Currently the following boards are supported:
++ stm32mp157c-ed1
+
+3. Boot Sequences
+=================
+
+BootRom => FSBL in SYSRAM => SSBL in DDR => OS (Linux Kernel)
+
+with FSBL = First Stage Bootloader
+     SSBL = Second Stage Bootloader
+
+One boot configuration is supported:
+
+   The "Basic" boot chain (defconfig_file : stm32mp15_basic_defconfig)
+   BootRom => FSBL = U-Boot SPL => SSBL = U-Boot
+   SPL has limited security initialisation
+   U-Boot is running in secure mode and provide a secure monitor to the kernel
+   with only PSCI support (Power State Coordination Interface defined by ARM)
+
+All the STM32MP1 board supported by U-Boot use the same generic board
+stm32mp1 which support all the bootable devices.
+
+Each board is configurated only with the associated device tree.
+
+4. Device Tree Selection
+========================
+
+You need to select the appropriate device tree for your board,
+the supported device trees for stm32mp157 are:
+
++ ed1: daughter board with pmic stpmu1
+  dts: stm32mp157c-ed1
+
+5. Build Procedure
+==================
+
+1. Install required tools for U-Boot
+
+   + install package needed in U-Boot makefile
+     (libssl-dev, swig, libpython-dev...)
+   + install ARMv7 toolchain for 32bit Cortex-A (from Linaro,
+     from SDK for STM32MP1, or any crosstoolchains from your distribution)
+
+2. Set the cross compiler:
+
+	# export CROSS_COMPILE=/path/to/toolchain/arm-linux-gnueabi-
+	(you can use any gcc cross compiler compatible with U-Boot)
+
+3. Select the output directory (optional)
+
+	# export KBUILD_OUTPUT=/path/to/output
+
+	for example: use one output directory for each configuration
+	# export KBUILD_OUTPUT=stm32mp15_basic
+
+4. Configure the U-Boot:
+
+	# make <defconfig_file>
+
+	- For basic boot mode: "stm32mp15_basic_defconfig"
+
+5. Configure the device-tree and build the U-Boot image:
+
+	# make DEVICE_TREE=<name> all
+
+
+  example:
+     basic boot on ed1
+	# export KBUILD_OUTPUT=stm32mp15_basic
+	# make stm32mp15_basic_defconfig
+	# make DEVICE_TREE=stm32mp157c-ed1 all
+
+6. Output files
+
+  BootRom and ATF expect binaries with STM32 image header
+  SPL expects file with U-Boot uImage header
+
+  So in the output directory (selected by KBUILD_OUTPUT),
+  you can found the needed files:
+
+   + FSBL = spl/u-boot-spl.stm32
+   + SSBL = u-boot.img
+
+6. Prepare an SDCard
+===================
+
+The minimal requirements for STMP32MP1 boot up to U-Boot are:
+- GPT partitioning (with gdisk or with sgdisk)
+- 2 fsbl partitions, named fsbl1 and fsbl2, size at least 256KiB
+- one ssbl partition for U-Boot
+
+Then the minimal GPT partition is:
+   ----- ------- --------- -------------
+  | Num | Name  | Size    |  Content    |
+   ----- ------- -------- --------------
+  |  1  | fsbl1 | 256 KiB |  ATF or SPL |
+  |  2  | fsbl2 | 256 KiB |  ATF or SPL |
+  |  3  | ssbl  | enought |  U-Boot     |
+  |  *  |  -    |  -      |  Boot/Rootfs|
+   ----- ------- --------- -------------
+
+(*) add bootable partition for extlinux.conf
+    following Generic Distribution
+    (doc/README.distro for use)
+
+  according the used card reader select the block device
+  (/dev/sdx or /dev/mmcblk0)
+  in the next example I use /dev/mmcblk0
+
+for example: with gpt table with 128 entries
+
+  a) remove previous formatting
+	# sgdisk -o /dev/<SDCard dev>
+
+  b) create minimal image
+	# sgdisk	--resize-table=128 -a 1 \
+		-n 1:34:545		-c 1:fsbl1 \
+		-n 2:546:1057		-c 2:fsbl2 \
+		-n 3:1058:5153		-c 3:ssbl \
+		-p /dev/<SDCard dev>
+
+	you can add other partition for kernel (rootfs)
+
+  c) copy the FSBL (2 times) and SSBL file on the correct partition.
+     in this example in partition 1 to 3
+
+     for basic boot mode : <SDCard dev> = /dev/mmcblk0
+	# dd if=u-boot-spl.stm32 of=/dev/mmcblk0p1
+	# dd if=u-boot-spl.stm32 of=/dev/mmcblk0p2
+	# dd if=u-boot.img of=/dev/mmcblk0p3
+
+7. Switch Setting
+==================
+
+You can select the boot mode, on the board ed1 with the switch SW1
+
+ -----------------------------------
+  Boot Mode   BOOT2   BOOT1   BOOT0
+ -----------------------------------
+  Reserved	0	0	0
+  NOR		0	0	1
+  SD-Card	1	1	1
+  SD-Card	1	0	1
+  eMMC		0	1	0
+  NAND		0	1	1
+  Recovery	1	1	0
+  Recovery	0	0	0
+
+
+To boot from SDCard, select BootPinMode = 1 1 1 and reset.
+
+Recovery is a boot from serial link (UART/USB) and it is used with
+STM32CubeProgrammer tool to load executable in RAM and to update the flash
+devices available on the board (NOR/NAND/eMMC/SDCARD).
+The communication between HOST and board is based on
+- for UARTs : the uart protocol used with all MCU STM32
+- for USB : based on USB DFU 1.1 (without the ST extensions used on MCU STM32)
diff --git a/board/st/stm32mp1/board.c b/board/st/stm32mp1/board.c
new file mode 100644
index 00000000000..03f900a3659
--- /dev/null
+++ b/board/st/stm32mp1/board.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <asm/io.h>
+#include <asm/arch/ddr.h>
+#include <power/pmic.h>
+#include <power/stpmu1.h>
+
+#ifdef CONFIG_PMIC_STPMU1
+int board_ddr_power_init(void)
+{
+	struct udevice *dev;
+	int ret;
+
+	ret = uclass_get_device_by_driver(UCLASS_PMIC,
+					  DM_GET_DRIVER(pmic_stpmu1), &dev);
+	if (ret)
+		/* No PMIC on board */
+		return 0;
+
+	/* Set LDO3 to sync mode */
+	ret = pmic_reg_read(dev, STPMU1_LDOX_CTRL_REG(STPMU1_LDO3));
+	if (ret < 0)
+		return ret;
+
+	ret &= ~STPMU1_LDO3_MODE;
+	ret &= ~STPMU1_LDO12356_OUTPUT_MASK;
+	ret |= STPMU1_LDO3_DDR_SEL << STPMU1_LDO12356_OUTPUT_SHIFT;
+
+	ret = pmic_reg_write(dev, STPMU1_LDOX_CTRL_REG(STPMU1_LDO3),
+			     ret);
+	if (ret < 0)
+		return ret;
+
+	/* Set BUCK2 to 1.35V */
+	ret = pmic_clrsetbits(dev,
+			      STPMU1_BUCKX_CTRL_REG(STPMU1_BUCK2),
+			      STPMU1_BUCK_OUTPUT_MASK,
+			      STPMU1_BUCK2_1350000V);
+	if (ret < 0)
+		return ret;
+
+	/* Enable BUCK2 and VREF */
+	ret = pmic_clrsetbits(dev,
+			      STPMU1_BUCKX_CTRL_REG(STPMU1_BUCK2),
+			      STPMU1_BUCK_EN, STPMU1_BUCK_EN);
+	if (ret < 0)
+		return ret;
+
+	mdelay(STPMU1_DEFAULT_START_UP_DELAY_MS);
+
+	ret = pmic_clrsetbits(dev, STPMU1_VREF_CTRL_REG,
+			      STPMU1_VREF_EN, STPMU1_VREF_EN);
+	if (ret < 0)
+		return ret;
+
+	mdelay(STPMU1_DEFAULT_START_UP_DELAY_MS);
+
+	/* Enable LDO3 */
+	ret = pmic_clrsetbits(dev,
+			      STPMU1_LDOX_CTRL_REG(STPMU1_LDO3),
+			      STPMU1_LDO_EN, STPMU1_LDO_EN);
+	if (ret < 0)
+		return ret;
+
+	mdelay(STPMU1_DEFAULT_START_UP_DELAY_MS);
+
+	return 0;
+}
+#endif
diff --git a/board/st/stm32mp1/spl.c b/board/st/stm32mp1/spl.c
new file mode 100644
index 00000000000..b7e5f247e7c
--- /dev/null
+++ b/board/st/stm32mp1/spl.c
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
+ */
+
+#include <config.h>
+#include <common.h>
+#include <spl.h>
+#include <dm.h>
+#include <ram.h>
+#include <asm/io.h>
+#include <post.h>
+#include <power/pmic.h>
+#include <power/stpmu1.h>
+#include <asm/arch/ddr.h>
+
+void spl_board_init(void)
+{
+	/* Keep vdd on during the reset cycle */
+#if defined(CONFIG_PMIC_STPMU1) && defined(CONFIG_SPL_POWER_SUPPORT)
+	struct udevice *dev;
+	int ret;
+
+	ret = uclass_get_device_by_driver(UCLASS_PMIC,
+					  DM_GET_DRIVER(pmic_stpmu1), &dev);
+	if (!ret)
+		pmic_clrsetbits(dev,
+				STPMU1_MASK_RESET_BUCK,
+				STPMU1_MASK_RESET_BUCK3,
+				STPMU1_MASK_RESET_BUCK3);
+#endif
+}
diff --git a/board/st/stm32mp1/stm32mp1.c b/board/st/stm32mp1/stm32mp1.c
new file mode 100644
index 00000000000..84c971c7933
--- /dev/null
+++ b/board/st/stm32mp1/stm32mp1.c
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
+ */
+#include <config.h>
+#include <common.h>
+#include <asm/arch/stm32.h>
+
+/*
+ * Get a global data pointer
+ */
+DECLARE_GLOBAL_DATA_PTR;
+
+int board_late_init(void)
+{
+	return 0;
+}
+
+/* board dependent setup after realloc */
+int board_init(void)
+{
+	/* address of boot parameters */
+	gd->bd->bi_boot_params = STM32_DDR_BASE + 0x100;
+
+	return 0;
+}