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Commit 228e3023 authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

Merge tag 'mct-exynos-for-v3.10' of... 

Merge tag 'mct-exynos-for-v3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into next/drivers

From Kukjin Kim <kgene.kim@samsung.com>:

add support exynos mct device tree and move into drivers/clocksource

* tag 'mct-exynos-for-v3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung

:
  clocksource: mct: Add terminating entry for exynos_mct_ids table
  clocksource: mct: Add missing semicolons in exynos_mct.c
  ARM: EXYNOS: move mct driver to drivers/clocksource
  ARM: EXYNOS: remove static io-remapping of mct registers for Exynos5
  ARM: dts: add mct device tree node for all supported Exynos SoC's
  ARM: EXYNOS: allow dt based discovery of mct controller using clocksource_of_init
  ARM: EXYNOS: add device tree support for MCT controller driver
  ARM: EXYNOS: prepare an array of MCT interrupt numbers and use it
  ARM: EXYNOS: add a register base address variable in mct controller driver

Conflicts:
	drivers/clocksource/Makefile
	drivers/clocksource/exynos_mct.c

[arnd: adapt to CLOCKSOURCE_OF_DECLARE interface change]

Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parents 894b7382 354599f4

Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt

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+68 −0
Original line number Diff line number Diff line 
Samsung's Multi Core Timer (MCT)



The Samsung's Multi Core Timer (MCT) module includes two main blocks, the

global timer and CPU local timers. The global timer is a 64-bit free running

up-counter and can generate 4 interrupts when the counter reaches one of the

four preset counter values. The CPU local timers are 32-bit free running

down-counters and generate an interrupt when the counter expires. There is

one CPU local timer instantiated in MCT for every CPU in the system.



Required properties:



- compatible: should be "samsung,exynos4210-mct".

  (a) "samsung,exynos4210-mct", for mct compatible with Exynos4210 mct.

  (b) "samsung,exynos4412-mct", for mct compatible with Exynos4412 mct.



- reg: base address of the mct controller and length of the address space

  it occupies.



- interrupts: the list of interrupts generated by the controller. The following

  should be the order of the interrupts specified. The local timer interrupts

  should be specified after the four global timer interrupts have been

  specified.



	0: Global Timer Interrupt 0

	1: Global Timer Interrupt 1

	2: Global Timer Interrupt 2

	3: Global Timer Interrupt 3

	4: Local Timer Interrupt 0

	5: Local Timer Interrupt 1

	6: ..

	7: ..

	i: Local Timer Interrupt n



Example 1: In this example, the system uses only the first global timer

	   interrupt generated by MCT and the remaining three global timer

	   interrupts are unused. Two local timer interrupts have been

	   specified.



	mct@10050000 {

		compatible = "samsung,exynos4210-mct";

		reg = <0x10050000 0x800>;

		interrupts = <0 57 0>, <0 0 0>, <0 0 0>, <0 0 0>,

			     <0 42 0>, <0 48 0>;

	};



Example 2: In this example, the MCT global and local timer interrupts are

	   connected to two seperate interrupt controllers. Hence, an

	   interrupt-map is created to map the interrupts to the respective

	   interrupt controllers.



	mct@101C0000 {

		compatible = "samsung,exynos4210-mct";

		reg = <0x101C0000 0x800>;

		interrupt-controller;

		#interrups-cells = <2>;

		interrupt-parent = <&mct_map>;

		interrupts = <0 0>, <1 0>, <2 0>, <3 0>,

			     <4 0>, <5 0>;



		mct_map: mct-map {

			#interrupt-cells = <2>;

			#address-cells = <0>;

			#size-cells = <0>;

			interrupt-map = <0x0 0 &combiner 23 3>,

					<0x4 0 &gic 0 120 0>,

					<0x5 0 &gic 0 121 0>;

		};

	};

arch/arm/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -1654,7 +1654,7 @@ config LOCAL_TIMERS 
	bool "Use local timer interrupts"

	depends on SMP

	default y

	select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)

	select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !CLKSRC_EXYNOS_MCT)

	help

	  Enable support for local timers on SMP platforms, rather then the

	  legacy IPI broadcast method.  Local timers allows the system

arch/arm/boot/dts/exynos4210.dtsi

+22 −0
Original line number Diff line number Diff line
@@ -47,6 +47,28 @@ 
			     <0 12 0>, <0 13 0>, <0 14 0>, <0 15 0>;

	};



	mct@10050000 {

		compatible = "samsung,exynos4210-mct";

		reg = <0x10050000 0x800>;

		interrupt-controller;

		#interrups-cells = <2>;

		interrupt-parent = <&mct_map>;

		interrupts = <0 0>, <1 0>, <2 0>, <3 0>,

			     <4 0>, <5 0>;



		mct_map: mct-map {

			#interrupt-cells = <2>;

			#address-cells = <0>;

			#size-cells = <0>;

			interrupt-map = <0x0 0 &gic 0 57 0>,

					<0x1 0 &gic 0 69 0>,

					<0x2 0 &combiner 12 6>,

					<0x3 0 &combiner 12 7>,

					<0x4 0 &gic 0 42 0>,

					<0x5 0 &gic 0 48 0>;

		};

	};



	pinctrl_0: pinctrl@11400000 {

		compatible = "samsung,exynos4210-pinctrl";

		reg = <0x11400000 0x1000>;

arch/arm/boot/dts/exynos4212.dtsi

+22 −0
Original line number Diff line number Diff line
@@ -25,4 +25,26 @@ 
	gic:interrupt-controller@10490000 {

		cpu-offset = <0x8000>;

	};



	mct@10050000 {

		compatible = "samsung,exynos4412-mct";

		reg = <0x10050000 0x800>;

		interrupt-controller;

		#interrups-cells = <2>;

		interrupt-parent = <&mct_map>;

		interrupts = <0 0>, <1 0>, <2 0>, <3 0>,

			     <4 0>, <5 0>;



		mct_map: mct-map {

			#interrupt-cells = <2>;

			#address-cells = <0>;

			#size-cells = <0>;

			interrupt-map = <0x0 0 &gic 0 57 0>,

					<0x1 0 &combiner 12 5>,

					<0x2 0 &combiner 12 6>,

					<0x3 0 &combiner 12 7>,

					<0x4 0 &gic 1 12 0>,

					<0x5 0 &gic 1 12 0>;

		};

	};

};

arch/arm/boot/dts/exynos4412.dtsi

+24 −0
Original line number Diff line number Diff line
@@ -25,4 +25,28 @@ 
	gic:interrupt-controller@10490000 {

		cpu-offset = <0x4000>;

	};



	mct@10050000 {

		compatible = "samsung,exynos4412-mct";

		reg = <0x10050000 0x800>;

		interrupt-controller;

		#interrups-cells = <2>;

		interrupt-parent = <&mct_map>;

		interrupts = <0 0>, <1 0>, <2 0>, <3 0>,

			     <4 0>, <5 0>, <6 0>, <7 0>;



		mct_map: mct-map {

			#interrupt-cells = <2>;

			#address-cells = <0>;

			#size-cells = <0>;

			interrupt-map = <0x0 0 &gic 0 57 0>,

					<0x1 0 &combiner 12 5>,

					<0x2 0 &combiner 12 6>,

					<0x3 0 &combiner 12 7>,

					<0x4 0 &gic 1 12 0>,

					<0x5 0 &gic 1 12 0>,

					<0x6 0 &gic 1 12 0>,

					<0x7 0 &gic 1 12 0>;

		};

	};

};