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Message-ID: <20170710004121.m5sp3wlovh7e6wzq@rob-hp-laptop>
Date: Sun, 9 Jul 2017 19:41:21 -0500
From: Rob Herring <robh@...nel.org>
To: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
Cc: linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
Vineet Gupta <Vineet.Gupta1@...opsys.com>,
Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
devicetree@...r.kernel.org
Subject: Re: [PATCH 3/3 v7] ARC: hsdk: initial port for HSDK board
On Mon, Jul 03, 2017 at 07:51:09PM +0300, Eugeniy Paltsev wrote:
> From: Alexey Brodkin <abrodkin@...opsys.com>
>
> This initial port adds support of ARC HS Development Kit board with some
> basic features such serial port, USB, SD/MMC and Ethernet.
>
> Essentially we run Linux kernel on all 4 cores (i.e. utilize SMP) and
> heavily use IO Coherency for speeding-up DMA-aware peripherals.
>
> Note as opposed to other ARC boards we link Linux kernel to
> 0x9000_0000 intentionally because cores 1 and 3 configured with DCCM
> situated at our more usual link base 0x8000_0000. We still can use
> memory region starting at 0x8000_0000 as we reallocate DCCM in our
> platform code.
>
> Note that PAE remapping for DMA clients does not work due to an RTL bug,
> so CREG_PAE register must be programmed to all zeroes, otherwise it will
> cause problems with DMA to/from peripherals even if PAE40 is not used.
>
> Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com>
> Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
> ---
> Changes v6 -> v7:
> * DTS: get rid of skeleton.dts, move cpus nodes to hsdk.dts
> * DTS: style fixes
> * Enable loadable modules, module unloading and NFS client as defaults
> * Get rid of ARC_PLAT_HSDK board config option
>
> Documentation/devicetree/bindings/arc/hsdk.txt | 7 +
> arch/arc/Makefile | 1 +
> arch/arc/boot/dts/hsdk.dts | 189 +++++++++++++++++++++++++
> arch/arc/configs/hsdk_defconfig | 78 ++++++++++
> arch/arc/kernel/devtree.c | 5 +-
> arch/arc/plat-hsdk/Makefile | 9 ++
> arch/arc/plat-hsdk/platform.c | 79 +++++++++++
> 7 files changed, 366 insertions(+), 2 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/arc/hsdk.txt
> create mode 100644 arch/arc/boot/dts/hsdk.dts
> create mode 100644 arch/arc/configs/hsdk_defconfig
> create mode 100644 arch/arc/plat-hsdk/Makefile
> create mode 100644 arch/arc/plat-hsdk/platform.c
>
> diff --git a/Documentation/devicetree/bindings/arc/hsdk.txt b/Documentation/devicetree/bindings/arc/hsdk.txt
> new file mode 100644
> index 0000000..be50654
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arc/hsdk.txt
> @@ -0,0 +1,7 @@
> +Synopsys DesignWare ARC HS Development Kit Device Tree Bindings
> +---------------------------------------------------------------------------
> +
> +ARC HSDK Board with quad-core ARC HS38x4 in silicon.
> +
> +Required root node properties:
> + - compatible = "snps,hsdk";
> diff --git a/arch/arc/Makefile b/arch/arc/Makefile
> index 44ef35d..e67397e 100644
> --- a/arch/arc/Makefile
> +++ b/arch/arc/Makefile
> @@ -111,6 +111,7 @@ core-$(CONFIG_ARC_PLAT_SIM) += arch/arc/plat-sim/
> core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/
> core-$(CONFIG_ARC_PLAT_AXS10X) += arch/arc/plat-axs10x/
> core-$(CONFIG_ARC_PLAT_EZNPS) += arch/arc/plat-eznps/
> +core-y += arch/arc/plat-hsdk/
>
> ifdef CONFIG_ARC_PLAT_EZNPS
> KBUILD_CPPFLAGS += -I$(srctree)/arch/arc/plat-eznps/include
> diff --git a/arch/arc/boot/dts/hsdk.dts b/arch/arc/boot/dts/hsdk.dts
> new file mode 100644
> index 0000000..33872f1
> --- /dev/null
> +++ b/arch/arc/boot/dts/hsdk.dts
> @@ -0,0 +1,189 @@
> +/*
> + * Copyright (C) 2017 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 ARC HS Development Kit
> + */
> +/dts-v1/;
> +
> +#include <dt-bindings/net/ti-dp83867.h>
> +
> +/ {
> + model = "snps,hsdk";
> + compatible = "snps,hsdk";
> +
> + #address-cells = <1>;
> + #size-cells = <1>;
> +
> + chosen {
> + bootargs = "earlycon=uart8250,mmio32,0xf0005000,115200n8 console=ttyS0,115200n8 debug print-fatal-signals=1";
> + };
> +
> + cpus {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + cpu@0 {
> + device_type = "cpu";
> + compatible = "snps,archs38";
> + reg = <0>;
> + clocks = <&core_clk>;
> + };
> +
> + cpu@1 {
> + device_type = "cpu";
> + compatible = "snps,archs38";
> + reg = <1>;
> + clocks = <&core_clk>;
> + };
> +
> + cpu@2 {
> + device_type = "cpu";
> + compatible = "snps,archs38";
> + reg = <2>;
> + clocks = <&core_clk>;
> + };
> +
> + cpu@3 {
> + device_type = "cpu";
> + compatible = "snps,archs38";
> + reg = <3>;
> + clocks = <&core_clk>;
> + };
> +
Move all the below to root level and out of the cpus node.
> + core_intc: archs-intc@cpu {
cpu-interrupt-controller
> + compatible = "snps,archs-intc";
> + interrupt-controller;
> + #interrupt-cells = <1>;
> + };
> +
> + idu_intc: idu-interrupt-controller {
> + compatible = "snps,archs-idu-intc";
> + interrupt-controller;
> + #interrupt-cells = <1>;
> + interrupt-parent = <&core_intc>;
> + };
> +
> + arcpct0: pct {
> + compatible = "snps,archs-pct";
> + };
> +
> + /* TIMER0 with interrupt for clockevent */
> + timer0 {
s/timer0/timer/
> + compatible = "snps,arc-timer";
> + interrupts = <16>;
> + interrupt-parent = <&core_intc>;
> + clocks = <&core_clk>;
> + };
> +
> + /* 64-bit Global Free Running Counter */
> + gfrc {
> + compatible = "snps,archs-timer-gfrc";
> + clocks = <&core_clk>;
> + };
> + };
> +
> + core_clk: core-clk {
> + #clock-cells = <0>;
> + compatible = "fixed-clock";
> + clock-frequency = <1000000000>;
> + };
> +
> + soc {
> + compatible = "simple-bus";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + interrupt-parent = <&idu_intc>;
> +
> + ranges = <0x00000000 0xf0000000 0x10000000>;
> +
> + serial: dw-apb-uart@...0 {
serial@...0
> + compatible = "snps,dw-apb-uart";
> + reg = <0x5000 0x100>;
> + clock-frequency = <33330000>;
> + interrupts = <6>;
> + baud = <115200>;
> + reg-shift = <2>;
> + reg-io-width = <4>;
> + };
> +
> + gmacclk: gmacclk {
> + compatible = "fixed-clock";
> + clock-frequency = <400000000>;
> + #clock-cells = <0>;
> + };
> +
> + mmcclk_ciu: mmcclk-ciu {
> + compatible = "fixed-clock";
> + clock-frequency = <100000000>;
> + #clock-cells = <0>;
> + };
> +
> + mmcclk_biu: mmcclk-biu {
> + compatible = "fixed-clock";
> + clock-frequency = <400000000>;
> + #clock-cells = <0>;
> + };
> +
> + ethernet@...0 {
> + #interrupt-cells = <1>;
> + compatible = "snps,dwmac";
> + reg = <0x8000 0x2000>;
> + interrupts = <10>;
> + interrupt-names = "macirq";
> + phy-mode = "rgmii";
> + snps,pbl = <32>;
> + clocks = <&gmacclk>;
> + clock-names = "stmmaceth";
> + phy-handle = <&phy0>;
> +
> + mdio {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + compatible = "snps,dwmac-mdio";
> + phy0: ethernet-phy@0 {
> + reg = <0>;
> + ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
> + ti,tx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
> + ti,fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
> + };
> + };
> + };
> +
> + ohci@...00 {
> + compatible = "generic-ohci";
Still, these need to be more specific.
> + reg = <0x60000 0x100>;
> + interrupts = <15>;
> + };
> +
> + ehci@...00 {
> + compatible = "generic-ehci";
> + reg = <0x40000 0x100>;
> + interrupts = <15>;
> + };
> +
> + mmc@...0 {
> + compatible = "altr,socfpga-dw-mshc";
> + reg = <0xa000 0x400>;
> + num-slots = <1>;
> + fifo-depth = <16>;
> + card-detect-delay = <200>;
> + clocks = <&mmcclk_biu>, <&mmcclk_ciu>;
> + clock-names = "biu", "ciu";
> + interrupts = <12>;
> + bus-width = <4>;
> + };
> + };
> +
> + memory@...00000 {
> + #address-cells = <1>;
> + #size-cells = <1>;
> + device_type = "memory";
> + reg = <0x80000000 0x40000000>; /* 1 GiB */
> + };
> +};
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