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Message-ID: <ca22ed53-b4f1-8b4f-9513-8bf068ce0d3c@synopsys.com>
Date: Tue, 30 May 2017 15:42:52 -0700
From: Vineet Gupta <Vineet.Gupta1@...opsys.com>
To: Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
<linux-snps-arc@...ts.infradead.org>
CC: <linux-kernel@...r.kernel.org>,
Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
Subject: Re: [PATCH] hsdk: initial port for HSDK board
On 05/30/2017 07:25 AM, Alexey Brodkin wrote:
> This initial port add support of ARC HS Development Kit board with some
> basic features such as SMP and serial port, USB, SD/MMC and Ethernet.
>
> 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.
>
> Also there's a prerequisite for this change required to get
> .dts compiled, see
> http://lists.infradead.org/pipermail/linux-snps-arc/2017-May/002462.html
>
> Signed-off-by: Eugeniy Paltsev <paltsev@...opsys.com>
> Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com>
> ---
> Documentation/devicetree/bindings/arc/hsdk.txt | 7 ++
> arch/arc/Kconfig | 1 +
> arch/arc/Makefile | 1 +
> arch/arc/boot/dts/hsdk.dts | 151 +++++++++++++++++++++++++
> arch/arc/configs/hsdk_defconfig | 72 ++++++++++++
> arch/arc/kernel/devtree.c | 2 +
> arch/arc/plat-hsdk/Kconfig | 12 ++
> arch/arc/plat-hsdk/Makefile | 9 ++
> arch/arc/plat-hsdk/platform.c | 73 ++++++++++++
> 9 files changed, 328 insertions(+)
> 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/Kconfig
> 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 000000000000..be50654bbf61
> --- /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/Kconfig b/arch/arc/Kconfig
> index a5459698f0ee..92c912819613 100644
> --- a/arch/arc/Kconfig
> +++ b/arch/arc/Kconfig
> @@ -101,6 +101,7 @@ source "arch/arc/plat-tb10x/Kconfig"
> source "arch/arc/plat-axs10x/Kconfig"
> #New platform adds here
> source "arch/arc/plat-eznps/Kconfig"
> +source "arch/arc/plat-hsdk/Kconfig"
>
> endmenu
>
> diff --git a/arch/arc/Makefile b/arch/arc/Makefile
> index 44ef35d33956..55ca925edf65 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-$(CONFIG_ARC_PLAT_HSDK) += arch/arc/plat-hsdk/
>
> ifdef CONFIG_ARC_PLAT_EZNPS
> KBUILD_CPPFLAGS += -I$(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 000000000000..e2d7373bb256
> --- /dev/null
> +++ b/arch/arc/boot/dts/hsdk.dts
> @@ -0,0 +1,151 @@
> +/*
> + * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
2017 ?
> + *
> + * 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/ "skeleton_hs_idu.dtsi"
> +
> +#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";
> + };
> +
> + cpu {
> + compatible = "simple-bus";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + interrupt-parent = <&core_intc>;
> +
> + core_clk: core_clk {
> + #clock-cells = <0>;
> + compatible = "fixed-clock";
> + clock-frequency = <1000000000>;
> + };
> +
> + core_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-cells = <1>;
> + };
> +
> + arcpct0: pct {
> + compatible = "snps,archs-pct";
> + };
> + };
> +
> + soc {
> + compatible = "simple-bus";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + interrupt-parent = <&idu_intc>;
> +
> + ranges = <0x00000000 0xf0000000 0x10000000>;
> +
> + uart: dw-apb-uart@...000 {
> + 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@...000 {
> + #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>;
> +
> + mdio0 {
> + #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@...0000 {
> + compatible = "generic-ohci";
> + reg = <0x60000 0x100>;
> + interrupts = <15>;
> + };
> +
> + ehci@...0000 {
> + compatible = "generic-ehci";
> + reg = <0x40000 0x100>;
> + interrupts = <15>;
> + };
> +
> + mmc@...000 {
> + 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 {
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges = <0x00000000 0x90000000 0x40000000>;
> + device_type = "memory";
> + reg = <0x90000000 0x10000000>; /* 256MiB */
why only 256 ?
> + };
> +};
> diff --git a/arch/arc/configs/hsdk_defconfig b/arch/arc/configs/hsdk_defconfig
> new file mode 100644
> index 000000000000..1a618817aeb2
> --- /dev/null
> +++ b/arch/arc/configs/hsdk_defconfig
> @@ -0,0 +1,72 @@
> +CONFIG_DEFAULT_HOSTNAME="ARCLinux"
> +CONFIG_SYSVIPC=y
> +# CONFIG_CROSS_MEMORY_ATTACH is not set
> +CONFIG_NO_HZ_IDLE=y
> +CONFIG_HIGH_RES_TIMERS=y
> +CONFIG_IKCONFIG=y
> +CONFIG_IKCONFIG_PROC=y
> +CONFIG_NAMESPACES=y
> +# CONFIG_UTS_NS is not set
> +# CONFIG_PID_NS is not set
> +CONFIG_BLK_DEV_INITRD=y
> +CONFIG_INITRAMFS_SOURCE="../../arc_initramfs_hs/"
> +CONFIG_EMBEDDED=y
> +CONFIG_PERF_EVENTS=y
> +# CONFIG_VM_EVENT_COUNTERS is not set
> +# CONFIG_COMPAT_BRK is not set
> +CONFIG_SLAB=y
> +CONFIG_ARC_PLAT_HSDK=y
> +CONFIG_ISA_ARCV2=y
> +CONFIG_SMP=y
> +CONFIG_LINUX_LINK_BASE=0x90000000
> +CONFIG_ARC_BUILTIN_DTB_NAME="hsdk"
> +CONFIG_PREEMPT=y
> +# CONFIG_COMPACTION is not set
> +CONFIG_NET=y
> +CONFIG_PACKET=y
> +CONFIG_UNIX=y
> +CONFIG_INET=y
> +CONFIG_DEVTMPFS=y
> +# CONFIG_STANDALONE is not set
> +# CONFIG_PREVENT_FIRMWARE_BUILD is not set
> +# CONFIG_FIRMWARE_IN_KERNEL is not set
> +CONFIG_SCSI=y
> +CONFIG_BLK_DEV_SD=y
> +CONFIG_NETDEVICES=y
> +CONFIG_STMMAC_ETH=y
> +CONFIG_DP83867_PHY=y
> +CONFIG_MICREL_PHY=y
> +# CONFIG_INPUT_KEYBOARD is not set
> +# CONFIG_INPUT_MOUSE is not set
> +# CONFIG_SERIO is not set
> +# CONFIG_LEGACY_PTYS is not set
> +CONFIG_SERIAL_8250=y
> +CONFIG_SERIAL_8250_CONSOLE=y
> +CONFIG_SERIAL_8250_DW=y
> +CONFIG_SERIAL_OF_PLATFORM=y
> +# CONFIG_HW_RANDOM is not set
> +# CONFIG_HWMON is not set
> +CONFIG_USB=y
> +CONFIG_USB_EHCI_HCD=y
> +CONFIG_USB_EHCI_HCD_PLATFORM=y
> +CONFIG_USB_OHCI_HCD=y
> +CONFIG_USB_OHCI_HCD_PLATFORM=y
> +CONFIG_USB_STORAGE=y
> +CONFIG_MMC=y
> +CONFIG_MMC_SDHCI=y
> +CONFIG_MMC_SDHCI_PLTFM=y
> +CONFIG_MMC_DW=y
> +# CONFIG_IOMMU_SUPPORT is not set
> +CONFIG_EXT3_FS=y
> +CONFIG_VFAT_FS=y
> +CONFIG_TMPFS=y
> +CONFIG_NLS_CODEPAGE_437=y
> +CONFIG_NLS_ISO8859_1=y
> +# CONFIG_ENABLE_WARN_DEPRECATED is not set
> +# CONFIG_ENABLE_MUST_CHECK is not set
> +CONFIG_STRIP_ASM_SYMS=y
> +CONFIG_LOCKUP_DETECTOR=y
> +CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=10
> +# CONFIG_SCHED_DEBUG is not set
> +# CONFIG_DEBUG_PREEMPT is not set
> +# CONFIG_FTRACE is not set
> diff --git a/arch/arc/kernel/devtree.c b/arch/arc/kernel/devtree.c
> index 3b67f538f142..172749f908c6 100644
> --- a/arch/arc/kernel/devtree.c
> +++ b/arch/arc/kernel/devtree.c
> @@ -33,6 +33,8 @@ static void __init arc_set_early_base_baud(unsigned long dt_root)
> arc_base_baud = 33333333; /* Fixed 33MHz clk (AXS10x) */
> else if (of_flat_dt_is_compatible(dt_root, "ezchip,arc-nps"))
> arc_base_baud = 800000000; /* Fixed 800MHz clk (NPS) */
> + else if (of_flat_dt_is_compatible(dt_root, "snps,hsdk"))
> + arc_base_baud = 33330000; /* Fixed 33.33MHz clk (HSDK) */
And this is not same as 3333_3333 ?
> else
> arc_base_baud = 50000000; /* Fixed default 50MHz */
> }
> diff --git a/arch/arc/plat-hsdk/Kconfig b/arch/arc/plat-hsdk/Kconfig
> new file mode 100644
> index 000000000000..0e9d3155272e
> --- /dev/null
> +++ b/arch/arc/plat-hsdk/Kconfig
> @@ -0,0 +1,12 @@
> +#
> +# Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
2017 ?
> +#
> +# 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.
> +#
> +
> +menuconfig ARC_PLAT_HSDK
> + bool "ARC HS Development Kit board"
> + help
> + Support for ARC HS Development Kit board
> diff --git a/arch/arc/plat-hsdk/Makefile b/arch/arc/plat-hsdk/Makefile
> new file mode 100644
> index 000000000000..292d6d99d023
> --- /dev/null
> +++ b/arch/arc/plat-hsdk/Makefile
> @@ -0,0 +1,9 @@
> +#
> +# Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
2017 ?
> +#
> +# 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.
> +#
> +
> +obj-y := platform.o
> diff --git a/arch/arc/plat-hsdk/platform.c b/arch/arc/plat-hsdk/platform.c
> new file mode 100644
> index 000000000000..68381fbe2c94
> --- /dev/null
> +++ b/arch/arc/plat-hsdk/platform.c
> @@ -0,0 +1,73 @@
> +/*
> + * ARC HSDK Platform support code
> + *
> + * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
2017 ?
> + *
> + * 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.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/smp.h>
> +#include <asm/arcregs.h>
> +#include <asm/io.h>
> +#include <asm/mach_desc.h>
> +
> +/*
> + * By default ICCM is mapped to 0x7z while this area is used for
> + * Virtual kernel mappings, so move it to currently unused area.
> + */
> +void relocate_iccm(void)
__init, static
> +{
> + if (cpuinfo_arc700[smp_processor_id()].iccm.sz)
> + write_aux_reg(ARC_REG_AUX_ICCM, 0x60000000);
> +}
> +
> +/*
> + * Default configuration of PAE regs doesn't work for us causeing
> + * problems with DMA to/from peripherals even if PAE40 is not used.
> + */
> +void fixup_pae_regs(void)
ditto !
> +{
> +#define ARC_PERIPHERAL_BASE 0xf0000000
> +#define CREG_BASE (ARC_PERIPHERAL_BASE + 0x1000)
> +#define CREG_PAE (CREG_BASE + 0x180)
> +#define CREG_PAE_UPDATE (CREG_BASE + 0x194)
> +
> + /* Default is 1, which means "PAE offset = 4GByte" */
> + writel(0, (void __iomem *) CREG_PAE);
can we use the relaxed version (needs to be done for AXS as well, but snce we are
starting a new platform - might as well use the right APIs to begin with !
> +
> + /* Really apply settings made above */
> + writel(1, (void __iomem *) CREG_PAE_UPDATE);
> +}
> +
> +static void hsdk_early_init(void)
__init ?
> +{
> + relocate_iccm();
> + fixup_pae_regs();
> +}
> +
> +static void hsdk_init_per_cpu(unsigned int cpu)
> +{
> + relocate_iccm();
> +}
> +
> +/*----------------------- Machine Descriptions ------------------------------
> + *
> + * Machine description is simply a set of platform/board specific callbacks
> + * This is not directly related to DeviceTree based dynamic device creation,
> + * however as part of early device tree scan, we also select the right
> + * callback set, by matching the DT compatible name.
> + */
> +
> +static const char *hsdk_compat[] __initconst = {
> + "snps,hsdk",
> + NULL,
> +};
> +
> +MACHINE_START(SIMULATION, "hsdk")
> + .dt_compat = hsdk_compat,
> + .init_early = hsdk_early_init,
> + .init_per_cpu = hsdk_init_per_cpu,
> +MACHINE_END
>
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