[PATCH v2 14/18] ARM: Add STM32 family machine

From: Maxime Coquelin
Date: Fri Feb 20 2015 - 13:04:43 EST

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

Signed-off-by: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
---
Documentation/arm/stm32/overview.txt | 32 ++++++++++++++++++++++++++
Documentation/arm/stm32/stm32f429-overview.txt | 22 ++++++++++++++++++
arch/arm/Kconfig | 22 ++++++++++++++++++
arch/arm/Makefile | 1 +
arch/arm/mach-stm32/Makefile | 1 +
arch/arm/mach-stm32/Makefile.boot | 0
arch/arm/mach-stm32/board-dt.c | 31 +++++++++++++++++++++++++
7 files changed, 109 insertions(+)
create mode 100644 Documentation/arm/stm32/overview.txt
create mode 100644 Documentation/arm/stm32/stm32f429-overview.txt
create mode 100644 arch/arm/mach-stm32/Makefile
create mode 100644 arch/arm/mach-stm32/Makefile.boot
create mode 100644 arch/arm/mach-stm32/board-dt.c

diff --git a/Documentation/arm/stm32/overview.txt b/Documentation/arm/stm32/overview.txt
new file mode 100644
index 0000000..d8bf6bb
--- /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@xxxxxxxxx>
diff --git a/Documentation/arm/stm32/stm32f429-overview.txt b/Documentation/arm/stm32/stm32f429-overview.txt
new file mode 100644
index 0000000..5206822
--- /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@xxxxxxxxx>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 97d07ed..cfd9532 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -774,6 +774,28 @@ config ARCH_OMAP1
help
Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)

+config ARCH_STM32
+ bool "STMicrolectronics STM32"
+ depends on !MMU
+ select ARCH_REQUIRE_GPIOLIB
+ select ARM_NVIC
+ select AUTO_ZRELADDR
+ select ARCH_HAS_RESET_CONTROLLER
+ select RESET_CONTROLLER
+ select PINCTRL
+ select PINCTRL_STM32
+ select CLKSRC_OF
+ select ARMV7M_SYSTICK
+ select COMMON_CLK
+ select CPU_V7M
+ select GENERIC_CLOCKEVENTS
+ select NO_DMA
+ select NO_IOPORT_MAP
+ select SPARSE_IRQ
+ select USE_OF
+ help
+ Support for STMicorelectronics STM32 processors.
+
endchoice

menu "Multiple platform selection"
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index c1785ee..7d00659 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 0000000..bd0b7b5
--- /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 0000000..e69de29
diff --git a/arch/arm/mach-stm32/board-dt.c b/arch/arm/mach-stm32/board-dt.c
new file mode 100644
index 0000000..1d681b3
--- /dev/null
+++ b/arch/arm/mach-stm32/board-dt.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) Maxime Coquelin 2015
+ * Author: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#include <linux/kernel.h>
+#include <linux/clk-provider.h>
+#include <linux/clocksource.h>
+#include <linux/reset-controller.h>
+#include <asm/v7m.h>
+#include <asm/mach/arch.h>
+
+static const char *const stm32_compat[] __initconst = {
+ "st,stm32f429",
+ NULL
+};
+
+static void __init stm32_timer_init(void)
+{
+ of_clk_init(NULL);
+ reset_controller_of_init();
+ clocksource_of_init();
+
+}
+
+DT_MACHINE_START(STM32DT, "STM32 (Device Tree Support)")
+ .init_time = stm32_timer_init,
+ .dt_compat = stm32_compat,
+ .restart = armv7m_restart,
+MACHINE_END
--
1.9.1

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