ARM: Add STM32 family machine

STMicrolectronics's STM32 series is a family of Cortex-M
microcontrollers. It is used in various applications, and
proposes a wide range of peripherals.

Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

7 files changed, 96 insertions, 0 deletions

diff --git a/Documentation/arm/stm32/overview.txt b/Documentation/arm/stm32/overview.txt
new file mode 100644
index 000000000000..09aed5588d7c
--- /dev/null
+++ b/Documentation/arm/stm32/overview.txt
@@ -0,0 +1,32 @@
+                        STM32 ARM Linux Overview
+                        ========================
+
+Introduction
+------------
+
+  The STMicroelectronics family of Cortex-M based MCUs are supported by the
+  'STM32' platform of ARM Linux. Currently only the STM32F429 is supported.
+
+
+Configuration
+-------------
+
+  A generic configuration is provided for STM32 family, and can be used as the
+  default by
+        make stm32_defconfig
+
+Layout
+------
+
+  All the files for multiple machine families are located in the platform code
+  contained in arch/arm/mach-stm32
+
+  There is a generic board board-dt.c in the mach folder which support
+  Flattened Device Tree, which means, it works with any compatible board with
+  Device Trees.
+
+
+Document Author
+---------------
+
+  Maxime Coquelin <mcoquelin.stm32@gmail.com>
diff --git a/Documentation/arm/stm32/stm32f429-overview.txt b/Documentation/arm/stm32/stm32f429-overview.txt
new file mode 100644
index 000000000000..5206822bd8ef
--- /dev/null
+++ b/Documentation/arm/stm32/stm32f429-overview.txt
@@ -0,0 +1,22 @@
+                        STM32F429 Overview
+                        ==================
+
+  Introduction
+  ------------
+        The STM32F429 is a Cortex-M4 MCU aimed at various applications.
+        It features:
+        - ARM Cortex-M4 up to 180MHz with FPU
+        - 2MB internal Flash Memory
+        - External memory support through FMC controller (PSRAM, SDRAM, NOR, NAND)
+        - I2C, SPI, SAI, CAN, USB OTG, Ethernet controllers
+        - LCD controller & Camera interface
+        - Cryptographic processor
+
+  Resources
+  ---------
+        Datasheet and reference manual are publicly available on ST website:
+        - http://www.st.com/web/en/catalog/mmc/FM141/SC1169/SS1577/LN1806?ecmp=stm32f429-439_pron_pr-ces2014_nov2013
+
+  Document Author
+  ---------------
+        Maxime Coquelin <mcoquelin.stm32@gmail.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 7cd23bb03244..99544479ab01 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -758,6 +758,24 @@ config ARCH_OMAP1
         help
           Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
 
+config ARCH_STM32
+        bool "STMicrolectronics STM32"
+        depends on !MMU
+        select ARCH_HAS_RESET_CONTROLLER
+        select ARM_NVIC
+        select ARMV7M_SYSTICK
+        select AUTO_ZRELADDR
+        select CLKSRC_OF
+        select COMMON_CLK
+        select CPU_V7M
+        select GENERIC_CLOCKEVENTS
+        select NO_IOPORT_MAP
+        select RESET_CONTROLLER
+        select SPARSE_IRQ
+        select USE_OF
+        help
+          Support for STMicroelectronics STM32 processors.
+
 endchoice
 
 menu "Multiple platform selection"
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index fe8f9ef89395..d7af1922f56f 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -196,6 +196,7 @@ machine-$(CONFIG_ARCH_SHMOBILE) 	+= shmobile
 machine-$(CONFIG_ARCH_SIRF)             += prima2
 machine-$(CONFIG_ARCH_SOCFPGA)          += socfpga
 machine-$(CONFIG_ARCH_STI)              += sti
+machine-$(CONFIG_ARCH_STM32)            += stm32
 machine-$(CONFIG_ARCH_SUNXI)            += sunxi
 machine-$(CONFIG_ARCH_TEGRA)            += tegra
 machine-$(CONFIG_ARCH_U300)             += u300
diff --git a/arch/arm/mach-stm32/Makefile b/arch/arm/mach-stm32/Makefile
new file mode 100644
index 000000000000..bd0b7b5d6e9d
--- /dev/null
+++ b/arch/arm/mach-stm32/Makefile
@@ -0,0 +1 @@
+obj-y += board-dt.o
diff --git a/arch/arm/mach-stm32/Makefile.boot b/arch/arm/mach-stm32/Makefile.boot
new file mode 100644
index 000000000000..eacfc3f5c33e
--- /dev/null
+++ b/arch/arm/mach-stm32/Makefile.boot
@@ -0,0 +1,3 @@
+# Empty file waiting for deletion once Makefile.boot isn't needed any more.
+# Patch waits for application at
+# http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=7889/1 .
diff --git a/arch/arm/mach-stm32/board-dt.c b/arch/arm/mach-stm32/board-dt.c
new file mode 100644
index 000000000000..f2ad7723d034
--- /dev/null
+++ b/arch/arm/mach-stm32/board-dt.c
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) Maxime Coquelin 2015
+ * Author:  Maxime Coquelin <mcoquelin.stm32@gmail.com>
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include <linux/kernel.h>
+#include <asm/v7m.h>
+#include <asm/mach/arch.h>
+
+static const char *const stm32_compat[] __initconst = {
+        "st,stm32f429",
+        NULL
+};
+
+DT_MACHINE_START(STM32DT, "STM32 (Device Tree Support)")
+        .dt_compat = stm32_compat,
+        .restart = armv7m_restart,
+MACHINE_END