Merge tag 'arc-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

Pull ARC architecture updates from Vineet Gupta:

 - support for HS38 cores based on ARCv2 ISA

     ARCv2 is the next generation ISA from Synopsys and basis for the
     HS3{4,6,8} families of processors which retain the traditional ARC mantra of
     low power and configurability and are now more performant and feature rich.

     HS38x is a 10 stage pipeline core which supports MMU (with huge pages) and
     SMP (upto 4 cores) among other features.

     + www.synopsys.com/dw/ipdir.php?ds=arc-hs38-processor
     + http://news.synopsys.com/2014-10-14-New-DesignWare-ARC-HS38-Processor-Doubles-Performance-for-Embedded-Linux-Applications
     + http://www.embedded.com/electronics-news/4435975/Synopsys-ARC-HS38-core-gives-2X-boost-to-Linux-based-apps

 - support for ARC SDP (Software Development platform): Main Board + CPU Cards
    = AXS101: CPU Card with ARC700 in silicon @ 700 MHz
    = AXS103: CPU Card with HS38x in FPGA

 - refactoring of ARCompact port to accomodate new ARCv2 ISA

 - misc updates/cleanups

* tag 'arc-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: (72 commits)
  ARC: Fix build failures for ARCompact in linux-next after ARCv2 support
  ARCv2: Allow older gcc to cope with new regime of ARCv2/ARCompact support
  ARCv2: [vdk] dts files and defconfig for HS38 VDK
  ARCv2: [axs103] Support ARC SDP FPGA platform for HS38x cores
  ARC: [axs101] Prepare for AXS103
  ARCv2: [nsim*hs*] Support simulation platforms for HS38x cores
  ARCv2: All bits in place, allow ARCv2 builds
  ARCv2: SLC: Handle explcit flush for DMA ops (w/o IO-coherency)
  ARCv2: STAR 9000837815 workaround hardware exclusive transactions livelock
  ARC: Reduce bitops lines of code using macros
  ARCv2: barriers
  arch: conditionally define smp_{mb,rmb,wmb}
  ARC: add smp barriers around atomics per Documentation/atomic_ops.txt
  ARC: add compiler barrier to LLSC based cmpxchg
  ARCv2: SMP: intc: IDU 2nd level intc for dynamic IRQ distribution
  ARCv2: SMP: clocksource: Enable Global Real Time counter
  ARCv2: SMP: ARConnect debug/robustness
  ARCv2: SMP: Support ARConnect (MCIP) for Inter-Core-Interrupts et al
  ARC: make plat_smp_ops weak to allow over-rides
  ARCv2: clocksource: Introduce 64bit local RTC counter
  ...

1 files changed, 126 insertions, 0 deletions

diff --git a/arch/arc/boot/dts/axc003_idu.dtsi b/arch/arc/boot/dts/axc003_idu.dtsi
new file mode 100644
index 000000000000..199d42820eca
--- /dev/null
+++ b/arch/arc/boot/dts/axc003_idu.dtsi
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2014, 2015 Synopsys, Inc. (www.synopsys.com)
+ *
+ * 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.
+ */
+
+/*
+ * Device tree for AXC003 CPU card: HS38x2 (Dual Core) with IDU intc
+ */
+
+/ {
+	compatible = "snps,arc";
+	clock-frequency = <75000000>;
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	cpu_card {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		ranges = <0x00000000 0xf0000000 0x10000000>;
+
+		cpu_intc: archs-intc@cpu {
+			compatible = "snps,archs-intc";
+			interrupt-controller;
+			#interrupt-cells = <1>;
+		};
+
+		idu_intc: idu-interrupt-controller {
+			compatible = "snps,archs-idu-intc";
+			interrupt-controller;
+			interrupt-parent = <&cpu_intc>;
+
+			/*
+			 * <hwirq  distribution>
+			 * distribution: 0=RR; 1=cpu0, 2=cpu1, 4=cpu2, 8=cpu3
+			 */
+			#interrupt-cells = <2>;
+
+			/*
+			 * upstream irqs to core intc - downstream these are
+			 * "COMMON" irq 0,1..
+			 */
+			interrupts = <24 25>;
+		};
+
+		/*
+		 * this GPIO block ORs all interrupts on CPU card (creg,..)
+		 * to uplink only 1 IRQ to ARC core intc
+		 */
+		dw-apb-gpio@0x2000 {
+			compatible = "snps,dw-apb-gpio";
+			reg = < 0x2000 0x80 >;
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			ictl_intc: gpio-controller@0 {
+				compatible = "snps,dw-apb-gpio-port";
+				gpio-controller;
+				#gpio-cells = <2>;
+				snps,nr-gpios = <30>;
+				reg = <0>;
+				interrupt-controller;
+				#interrupt-cells = <2>;
+				interrupt-parent = <&idu_intc>;
+
+				/*
+				 * cmn irq 1 -> cpu irq 25
+				 * Distribute to cpu0 only
+				 */
+				interrupts = <1 1>;
+			};
+		};
+
+		debug_uart: dw-apb-uart@0x5000 {
+			compatible = "snps,dw-apb-uart";
+			reg = <0x5000 0x100>;
+			clock-frequency = <33333000>;
+			interrupt-parent = <&ictl_intc>;
+			interrupts = <2 4>;
+			baud = <115200>;
+			reg-shift = <2>;
+			reg-io-width = <4>;
+		};
+
+		arcpct0: pct {
+			compatible = "snps,archs-pct";
+			#interrupt-cells = <1>;
+			interrupt-parent = <&cpu_intc>;
+			interrupts = <20>;
+		};
+	};
+
+	/*
+	 * This INTC is actually connected to DW APB GPIO
+	 * which acts as a wire between MB INTC and CPU INTC.
+	 * GPIO INTC is configured in platform init code
+	 * and here we mimic direct connection from MB INTC to
+	 * CPU INTC, thus we set "interrupts = <0 1>" instead of
+	 * "interrupts = <12>"
+	 *
+	 * This intc actually resides on MB, but we move it here to
+	 * avoid duplicating the MB dtsi file given that IRQ from
+	 * this intc to cpu intc are different for axs101 and axs103
+	 */
+	mb_intc: dw-apb-ictl@0xe0012000 {
+		#interrupt-cells = <1>;
+		compatible = "snps,dw-apb-ictl";
+		reg = < 0xe0012000 0x200 >;
+		interrupt-controller;
+		interrupt-parent = <&idu_intc>;
+		interrupts = <0 1>;	/* cmn irq 0 -> cpu irq 24
+					   distribute to cpu0 only */
+	};
+
+	memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0x00000000 0x80000000 0x40000000>;
+		device_type = "memory";
+		reg = <0x00000000 0x20000000>;	/* 512MiB */
+	};
+};