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authorLinus Torvalds2015-07-01 09:24:26 -0700
committerLinus Torvalds2015-07-01 09:24:26 -0700
commit0890a264794f33df540fbaf274699146903b4e6b (patch)
tree0db148936c0275f7da7e607768e3c1018fb733cc /Documentation
parent05a8256c586ab75bcd6b793737b2022a1a98cb1e (diff)
parent40b8ad8f762cae4c44852ee1736ba766f52d5cc3 (diff)
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 ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/arc/archs-idu-intc.txt46
-rw-r--r--Documentation/devicetree/bindings/arc/archs-intc.txt22
-rw-r--r--Documentation/devicetree/bindings/arc/axs101.txt7
-rw-r--r--Documentation/devicetree/bindings/arc/axs103.txt8
4 files changed, 83 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/arc/archs-idu-intc.txt b/Documentation/devicetree/bindings/arc/archs-idu-intc.txt
new file mode 100644
index 000000000000..0dcb7c7d3e40
--- /dev/null
+++ b/Documentation/devicetree/bindings/arc/archs-idu-intc.txt
@@ -0,0 +1,46 @@
+* ARC-HS Interrupt Distribution Unit
+
+ This optional 2nd level interrupt controller can be used in SMP configurations for
+ dynamic IRQ routing, load balancing of common/external IRQs towards core intc.
+
+Properties:
+
+- compatible: "snps,archs-idu-intc"
+- interrupt-controller: This is an interrupt controller.
+- interrupt-parent: <reference to parent core intc>
+- #interrupt-cells: Must be <2>.
+- interrupts: <...> specifies the upstream core irqs
+
+ First cell specifies the "common" IRQ from peripheral to IDU
+ Second cell specifies the irq distribution mode to cores
+ 0=Round Robin; 1=cpu0, 2=cpu1, 4=cpu2, 8=cpu3
+
+ intc accessed via the special ARC AUX register interface, hence "reg" property
+ is not specified.
+
+Example:
+ core_intc: core-interrupt-controller {
+ compatible = "snps,archs-intc";
+ interrupt-controller;
+ #interrupt-cells = <1>;
+ };
+
+ idu_intc: idu-interrupt-controller {
+ compatible = "snps,archs-idu-intc";
+ interrupt-controller;
+ interrupt-parent = <&core_intc>;
+
+ /*
+ * <hwirq distribution>
+ * distribution: 0=RR; 1=cpu0, 2=cpu1, 4=cpu2, 8=cpu3
+ */
+ #interrupt-cells = <2>;
+
+ /* upstream core irqs: downstream these are "COMMON" irq 0,1.. */
+ interrupts = <24 25 26 27 28 29 30 31>;
+ };
+
+ some_device: serial@c0fc1000 {
+ interrupt-parent = <&idu_intc>;
+ interrupts = <0 0>; /* upstream idu IRQ #24, Round Robin */
+ };
diff --git a/Documentation/devicetree/bindings/arc/archs-intc.txt b/Documentation/devicetree/bindings/arc/archs-intc.txt
new file mode 100644
index 000000000000..69f326d6a5ad
--- /dev/null
+++ b/Documentation/devicetree/bindings/arc/archs-intc.txt
@@ -0,0 +1,22 @@
+* ARC-HS incore Interrupt Controller (Provided by cores implementing ARCv2 ISA)
+
+Properties:
+
+- compatible: "snps,archs-intc"
+- interrupt-controller: This is an interrupt controller.
+- #interrupt-cells: Must be <1>.
+
+ Single Cell "interrupts" property of a device specifies the IRQ number
+ between 16 to 256
+
+ intc accessed via the special ARC AUX register interface, hence "reg" property
+ is not specified.
+
+Example:
+
+ intc: interrupt-controller {
+ compatible = "snps,archs-intc";
+ interrupt-controller;
+ #interrupt-cells = <1>;
+ interrupts = <16 17 18 19 20 21 22 23 24 25>;
+ };
diff --git a/Documentation/devicetree/bindings/arc/axs101.txt b/Documentation/devicetree/bindings/arc/axs101.txt
new file mode 100644
index 000000000000..48290d5178b5
--- /dev/null
+++ b/Documentation/devicetree/bindings/arc/axs101.txt
@@ -0,0 +1,7 @@
+Synopsys DesignWare ARC Software Development Platforms Device Tree Bindings
+---------------------------------------------------------------------------
+
+SDP Main Board with an AXC001 CPU Card hoisting ARC700 core in silicon
+
+Required root node properties:
+ - compatible = "snps,axs101", "snps,arc-sdp";
diff --git a/Documentation/devicetree/bindings/arc/axs103.txt b/Documentation/devicetree/bindings/arc/axs103.txt
new file mode 100644
index 000000000000..6eea862e72b9
--- /dev/null
+++ b/Documentation/devicetree/bindings/arc/axs103.txt
@@ -0,0 +1,8 @@
+Synopsys DesignWare ARC Software Development Platforms Device Tree Bindings
+---------------------------------------------------------------------------
+
+SDP Main Board with an AXC003 FPGA Card which can contain various flavours of
+HS38x cores.
+
+Required root node properties:
+ - compatible = "snps,axs103", "snps,arc-sdp";