From 116a635581f292cb4882ea1a086f842904f85c3c Mon Sep 17 00:00:00 2001
From: Kristofer Jonsson <kristofer.jonsson@arm.com>
Date: Thu, 20 Aug 2020 17:25:23 +0200
Subject: Initial commit

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+# Linux driver stack for Arm Ethos-U
+
+The Linux driver stack for Arm Ethos-U provides an example of how a rich
+operating system like Linux can dispatch inferences to an Arm Cortex-M
+subsystem, consisting of an Arm Cortex-M of choice and an Arm Ethos-U NPU.
+
+## Licenses
+
+The kernel drivers are provided under a GPL v2 license. All other software
+componantes are provided under an Apache 2.0 license.
+
+## Building
+
+The driver stack comes with a CMake based build system. Cross compile for an Arm
+CPU can for example be done with the provided toolchain file.
+
+```
+$ mkdir build
+$ cd build
+$ cmake .. -DCMAKE_TOOLCHAIN_FILE=../cmake/toolchain/aarch64-linux-gnu.cmake -DKDIR=<Kernel directory>
+$ make
+```
+
+## DTB
+
+The kernel driver uses the mailbox APIs as a doorbell mechanism.
+
+```
+/ {
+  reserved-memory {
+    #address-cells = <2>;
+    #size-cells = <2>;
+    ranges;
+
+    ethosu_msg: ethosu_msg@80000000 {
+      compatible = "shared-dma-pool";
+      reg = <0 0x80000000 0 0x00040000>;
+      no-map;
+    };
+
+    ethosu_reserved: ethosu_reserved@80040000 {
+      compatible = "shared-dma-pool";
+      reg = <0 0x80040000 0 0x00040000>;
+      no-map;
+    };
+  };
+
+  ethosu_mailbox: mhu@6ca00000 {
+    compatible = "arm,mhu", "arm,primecell";
+    reg = <0x0 0x6ca00000 0x0 0x1000>;
+    interrupts = <0 168 4>;
+    interrupt-names = "npu_rx";
+    #mbox-cells = <1>;
+    clocks = <&soc_refclk100mhz>;
+    clock-names = "apb_pclk";
+  };
+
+  ethosu {
+    #address-cells = <2>;
+    #size-cells = <2>;
+
+    compatible = "arm,ethosu";
+    reg = <0 0x80000000 0 0x00010000>,
+          <0 0x80010000 0 0x00010000>;
+    reg-names = "in_queue", "out_queue";
+    memory-region = <&ethosu_reserved>;
+    dma-ranges = <0 0x60000000 0 0x80000000 0 0x20000000>;
+    mboxes= <&ethosu_mailbox 0>, <&ethosu_mailbox 0>;
+    mbox-names = "tx", "rx";
+  };
+};
+```
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