From 41d9830cd09f652936be95431cecfbac39ed09f7 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Sat, 21 Jan 2017 12:59:05 +0100 Subject: ARM: gemini: DT for the Cortina Gemini SoC platforms This adds initial and compulsory device tree support to the Gemini ARMv4 platform. We are selecting a bunch of "absolute minimals" for getting a working system up with just device tree: - We select USE_OF for natural reasons or nothing works. - We select CLKSRC_OF and GEMINI_TIMER so we get timekeeping from the clocksource. - We select GPIO_GEMINI because these are used as irqchips, and for a generic driver it is not reasonable for those to have to select every possible irqchip in the world to work, the platform should simply provide the available irqchips. - We select a UART that can be exprected to work with SERIAL_OF_PLATFORM which is the name for an 8250 OF-probed serial port. - We select the syscon-based reset controller: it's not fun when "reboot" doesn't work because of Kconfig, so we just select POWER_RESET and POWER_RESET_SYSCON. - We perhaps a bit controversiallt select ARM_APPENDED_DTB, because this platform is using the ancient RedBoot, and can *NOT* be expected to upgrade its bootloaders. Appended device tree is simply how these devices have to work with device tree. Cc: Janos Laube Cc: Paulius Zaleckas Cc: Hans Ulli Kroll Cc: Florian Fainelli Signed-off-by: Linus Walleij --- arch/arm/Kconfig | 10 ++++++++-- arch/arm/mach-gemini/Makefile | 2 +- arch/arm/mach-gemini/board-dt.c | 38 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 47 insertions(+), 3 deletions(-) create mode 100644 arch/arm/mach-gemini/board-dt.c (limited to 'arch') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 6c2b72b173c8..637f5756dca8 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -361,11 +361,17 @@ config ARM_SINGLE_ARMV7M config ARCH_GEMINI bool "Cortina Systems Gemini" - select CLKSRC_MMIO + select ARM_APPENDED_DTB # Old Redboot bootloaders deployed select CPU_FA526 - select GENERIC_CLOCKEVENTS + select FARADAY_FTINTC010 + select FTTMR010_TIMER + select GPIO_GEMINI select GPIOLIB select MULTI_IRQ_HANDLER + select POWER_RESET + select POWER_RESET_SYSCON + select SERIAL_OF_PLATFORM + select USE_OF help Support for the Cortina Systems Gemini family SoCs diff --git a/arch/arm/mach-gemini/Makefile b/arch/arm/mach-gemini/Makefile index 7963a77be637..11f07fb6ec3d 100644 --- a/arch/arm/mach-gemini/Makefile +++ b/arch/arm/mach-gemini/Makefile @@ -4,7 +4,7 @@ # Object file lists. -obj-y := irq.o mm.o time.o devices.o gpio.o idle.o reset.o +obj-y := irq.o mm.o time.o devices.o gpio.o idle.o reset.o board-dt.o # Board-specific support obj-$(CONFIG_MACH_NAS4220B) += board-nas4220b.o diff --git a/arch/arm/mach-gemini/board-dt.c b/arch/arm/mach-gemini/board-dt.c new file mode 100644 index 000000000000..208ea99cdc47 --- /dev/null +++ b/arch/arm/mach-gemini/board-dt.c @@ -0,0 +1,38 @@ +/* + * Gemini Device Tree boot support + */ +#include +#include +#include + +#include +#include + +#ifdef CONFIG_DEBUG_GEMINI +/* This is needed for LL-debug/earlyprintk/debug-macro.S */ +static struct map_desc gemini_io_desc[] __initdata = { + { + .virtual = CONFIG_DEBUG_UART_VIRT, + .pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS), + .length = SZ_4K, + .type = MT_DEVICE, + }, +}; + +static void __init gemini_map_io(void) +{ + iotable_init(gemini_io_desc, ARRAY_SIZE(gemini_io_desc)); +} +#else +#define gemini_map_io NULL +#endif + +static const char *gemini_board_compat[] = { + "cortina,gemini", + NULL, +}; + +DT_MACHINE_START(GEMINI_DT, "Gemini (Device Tree)") + .map_io = gemini_map_io, + .dt_compat = gemini_board_compat, +MACHINE_END -- cgit