ARM: new platform for Energy Micro's EFM32 Cortex-M3 SoCs

Hello,

I forgot to mention that this patch depends on the following patches:

- ARM: ARMv7-M: implement restart routine common to all v7-M machines
sent with Message-Id: 1376494305-24270-1-git-send-email-u.kleine-koenig at pengutronix.de; and

- clk: new driver for efm32 SoC
sent with Message-Id: 1376510693-12491-1-git-send-email-u.kleine-koenig at pengutronix.de

So in the unlikely case you are already happy with this patch, it needs some coordination to go in.

Quoted 6 lines · Uwe Kleine-K?nig

Hello,

I forgot to mention that this patch depends on the following patches:

- ARM: ARMv7-M: implement restart routine common to all v7-M machines
sent with Message-Id: 1376494305-24270-1-git-send-email-u.kleine-koenig at pengutronix.de; and

Seems like you addressed Russell's comments here, so hopefully he's ok with us picking it up directly as a prereq.

Signed-off-by Uwe Kleine-K?nig <[email protected]>

---
 arch/arm/Kconfig                               |  15 +-
 arch/arm/Kconfig.debug                         |  16 ++
 arch/arm/Makefile                              |   1 +
 arch/arm/boot/dts/Makefile                     |   1 +
 arch/arm/boot/dts/armv7-m.dtsi                 |  18 ++
 arch/arm/boot/dts/efm32gg-dk3750.dts           |  63 ++++++
 arch/arm/boot/dts/efm32gg.dtsi                 | 141 +++++++++++++
 arch/arm/configs/efm32_defconfig               | 104 ++++++++++
 arch/arm/mach-efm32/Makefile                   |   1 +
 arch/arm/mach-efm32/Makefile.boot              |   2 +
 arch/arm/mach-efm32/cmu.h                      |  15 ++
 arch/arm/mach-efm32/common.h                   |   1 +
 arch/arm/mach-efm32/dtmachine.c                |  31 +++
 arch/arm/mach-efm32/include/mach/debug-macro.S |  48 +++++
 arch/arm/mach-efm32/include/mach/entry-macro.S |   5 +
 arch/arm/mach-efm32/include/mach/io.h          |   6 +
 arch/arm/mach-efm32/include/mach/irqs.h        |   6 +
 arch/arm/mach-efm32/include/mach/timex.h       |   7 +
 arch/arm/mach-efm32/time.c                     | 261 +++++++++++++++++++++++++
 19 files changed, 741 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/boot/dts/armv7-m.dtsi
 create mode 100644 arch/arm/boot/dts/efm32gg-dk3750.dts
 create mode 100644 arch/arm/boot/dts/efm32gg.dtsi
 create mode 100644 arch/arm/configs/efm32_defconfig
 create mode 100644 arch/arm/mach-efm32/Makefile
 create mode 100644 arch/arm/mach-efm32/Makefile.boot
 create mode 100644 arch/arm/mach-efm32/cmu.h
 create mode 100644 arch/arm/mach-efm32/common.h
 create mode 100644 arch/arm/mach-efm32/dtmachine.c
 create mode 100644 arch/arm/mach-efm32/include/mach/debug-macro.S
 create mode 100644 arch/arm/mach-efm32/include/mach/entry-macro.S
 create mode 100644 arch/arm/mach-efm32/include/mach/io.h
 create mode 100644 arch/arm/mach-efm32/include/mach/irqs.h
 create mode 100644 arch/arm/mach-efm32/include/mach/timex.h
 create mode 100644 arch/arm/mach-efm32/time.c

arch/arm/Kconfig +14 -1

index 43594d5..d45cc5d 100644
@@ -404,6 +404,19 @@ config ARCH_EBSA110
 	  Ethernet interface, two PCMCIA sockets, two serial ports and a
 	  parallel port.
 
+config ARCH_EFM32
+	bool "Energy Micro Cortex M3 Platform"
+	depends on !MMU
+	select ARM_NVIC
+	select CLKSRC_MMIO
+	select COMMON_CLK
+	select CPU_V7M
+	select GENERIC_CLOCKEVENTS
+	select HAVE_CLK
+	select NO_DMA
+	select NO_IOPORT
+	select USE_OF
+
 config ARCH_EP93XX
 	bool "EP93xx-based"
 	select ARCH_HAS_HOLES_MEMORYMODEL

@@ -1762,7 +1775,7 @@ config FORCE_MAX_ZONEORDER
 	int "Maximum zone order" if ARCH_SHMOBILE
 	range 11 64 if ARCH_SHMOBILE
 	default "12" if SOC_AM33XX
-	default "9" if SA1111
+	default "9" if SA1111 || ARCH_EFM32
 	default "11"
 	help
 	  The kernel memory allocator divides physically contiguous memory

arch/arm/Kconfig.debug +9 -0

index 583f4a0..1d99e38 100644
@@ -167,6 +167,22 @@ choice
 		  Say Y here if you want the debug print routines to direct
 		  their output to the serial port in the DC21285 (Footbridge).
 
+	config DEBUG_EFM32_UART1
+		bool "Kernel low-level debugging messages via UART1 (ttyefm4)"
+		depends on ARCH_EFM32
+		help
+		  Say Y here if you want the debug print routines to direct
+		  their output to the second UART port on efm32 based
+		  machines.
+
+	config DEBUG_EFM32_USART1

arch/arm/Makefile +1 -0

index 6fd2cea..ae48049 100644
@@ -152,6 +152,7 @@ machine-$(CONFIG_ARCH_CNS3XXX)		+= cns3xxx
 machine-$(CONFIG_ARCH_DAVINCI)		+= davinci
 machine-$(CONFIG_ARCH_DOVE)		+= dove
 machine-$(CONFIG_ARCH_EBSA110)		+= ebsa110
+machine-$(CONFIG_ARCH_EFM32)		+= efm32
 machine-$(CONFIG_ARCH_EP93XX)		+= ep93xx
 machine-$(CONFIG_ARCH_EXYNOS)		+= exynos
 machine-$(CONFIG_ARCH_GEMINI)		+= gemini

arch/arm/boot/dts/Makefile +1 -0

index 641b3c9..dd3b47e 100644
@@ -48,6 +48,7 @@ dtb-$(CONFIG_ARCH_DAVINCI) += da850-enbw-cmc.dtb \
 dtb-$(CONFIG_ARCH_DOVE) += dove-cm-a510.dtb \
 	dove-cubox.dtb \
 	dove-dove-db.dtb
+dtb-$(CONFIG_ARCH_EFM32) += efm32gg-dk3750.dtb
 dtb-$(CONFIG_ARCH_EXYNOS) += exynos4210-origen.dtb \
 	exynos4210-smdkv310.dtb \
 	exynos4210-trats.dtb \

arch/arm/boot/dts/armv7-m.dtsi new file +0 -0

new file mode 100644
index 0000000..dc2cf8d

arch/arm/boot/dts/efm32gg-dk3750.dts new file +63 -0

new file mode 100644
index 0000000..4ae1ffc
@@ -0,0 +1,63 @@
+/dts-v1/;
+#include "efm32gg.dtsi"
+
+/ {
+	model = "Energy Micro Giant Gecko Development Kit";
+	compatible = "efm32,dk3750";
+
+	chosen {
+		bootargs = "console=ttyefm4,115200 init=/linuxrc ignore_loglevel ihash_entries=64 dhash_entries=64 earlyprintk uclinux.physaddr=0x8c400000 root=/dev/mtdblock0";
+	};
+
+	memory {
+		reg = <0x88000000 0x400000>;
+	};
+
+	soc {
+		adc at 0x40002000 {
+			status = "ok";
+		};
+
+		spi0: spi at 0x4000c000 { /* USART0 */
+			cs-gpios = <&gpio 68 1>; // E4
+			location = <1>;
+			status = "ok";
+
+			microsd at 0 {
+				compatible = "mmc-spi-slot";
+				spi-max-frequency = <100000>;
+				voltage-ranges = <3200 3400>;
+				broken-cd;
+				reg = <0>;
+			};
+		};
+
+		spi1: spi at 0x4000c400 { /* USART1 */
+			cs-gpios = <&gpio 51 1>; // D3
+			location = <1>;
+			status = "ok";
+
+			ks8851 at 0 {
+				compatible = "ks8851";
+				spi-max-frequency = <6000000>;
+				reg = <0>;
+				interrupt-parent = <&boardfpga>;
+				interrupts = <4>;
+			};
+		};
+
+		uart4: uart at 0x4000e400 { /* UART1 */
+			location = <2>;
+			status = "ok";
+		};
+
+		boardfpga: boardfpga at 0x80000000 {
+			compatible = "efm32board";
+			reg = <0x80000000 0x400>;
+			irq-gpios = <&gpio 64 1>;
+			interrupt-controller;
+			#interrupt-cells = <1>;
+			status = "ok";
+		};
+	};
+};

arch/arm/mach-efm32/include/mach/debug-macro.S new file +38 -0

new file mode 100644
index 0000000..c58915c
@@ -0,0 +1,48 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define UARTn_CMD		0x000c
+#define UARTn_CMD_TXEN			0x0004
+
+#define	UARTn_STATUS		0x0010
+#define	UARTn_STATUS_TXC		0x0020
+#define	UARTn_STATUS_TXBL		0x0040
+
+#define	UARTn_TXDATA		0x0034
+
+		.macro	addruart, rx, tmp
+#if defined(CONFIG_DEBUG_EFM32_USART1)
+		ldr	\rx, =(0x4000c400)		/* USART1 */
+#elif defined(CONFIG_DEBUG_EFM32_UART1)
+		ldr	\rx, =(0x4000e400)		/* UART1 */
+#else
+#error "No debug port configured"
+#endif
+		/*
+		 * enable TX. The driver might disable that to save energy. We
+		 * don't care about disabling at the end as during debug power
+		 * consumption isn't that important.
+		 */
+		ldr	\tmp, =(UARTn_CMD_TXEN)
+		str	\tmp, [\rx, #UARTn_CMD]
+		.endm
+
+
+		.macro	senduart,rd,rx
+		strb	\rd, [\rx, #UARTn_TXDATA]
+		.endm
+
+		.macro	waituart,rd,rx