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Date: Wed, 25 Mar 2020 10:08:25 +0800
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: Huacai Chen <chenhc@...ote.com>
CC: "open list:MIPS" <linux-mips@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Jason Cooper <jason@...edaemon.net>,
Marc Zyngier <maz@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Allison Randal <allison@...utok.net>,
LKML <linux-kernel@...r.kernel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH v6 09/11] MIPS: Loongson64: Add generic dts
于 2020年3月25日 GMT+08:00 上午10:11:05, Huacai Chen <chenhc@...ote.com> 写到:
>Hi, Jiaxun,
>
>On Tue, Mar 24, 2020 at 11:40 PM Jiaxun Yang <jiaxun.yang@...goat.com>
>wrote:
>>
>> Add generic device dts for Loongson-3 devices.
>> They are currently almost identical but will be different later.
>> Some PCH devices like PCI Host Bridge is still enabled by platform
>> code for now.
>>
>> Co-developed-by: Huacai Chen <chenhc@...ote.com>
>> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
>> ---
>> arch/mips/Kconfig | 6 +-
>> arch/mips/boot/dts/Makefile | 1 +
>> arch/mips/boot/dts/loongson/Makefile | 4 ++
>> .../boot/dts/loongson/loongson3-package.dtsi | 62
>+++++++++++++++++++
>> .../dts/loongson/loongson3_4core_rs780e.dts | 25 ++++++++
>> .../dts/loongson/loongson3_8core_rs780e.dts | 25 ++++++++
>> arch/mips/boot/dts/loongson/rs780e-pch.dtsi | 26 ++++++++
>> 7 files changed, 147 insertions(+), 2 deletions(-)
>> create mode 100644 arch/mips/boot/dts/loongson/Makefile
>> create mode 100644
>arch/mips/boot/dts/loongson/loongson3-package.dtsi
>> create mode 100644
>arch/mips/boot/dts/loongson/loongson3_4core_rs780e.dts
>> create mode 100644
>arch/mips/boot/dts/loongson/loongson3_8core_rs780e.dts
>> create mode 100644 arch/mips/boot/dts/loongson/rs780e-pch.dtsi
>>
>> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
>> index ca3045b2a2d9..4a0b2f494d79 100644
>> --- a/arch/mips/Kconfig
>> +++ b/arch/mips/Kconfig
>> @@ -486,9 +486,11 @@ config MACH_LOONGSON64
>> select SYS_SUPPORTS_HIGHMEM
>> select SYS_SUPPORTS_LITTLE_ENDIAN
>> select SYS_SUPPORTS_ZBOOT
>> - select LOONGSON_MC146818
>> select ZONE_DMA32
>> select NUMA
>> + select COMMON_CLK
>> + select USE_OF
>> + select BUILTIN_DTB
>> help
>> This enables the support of Loongson-2/3 family of
>machines.
>>
>> @@ -3081,7 +3083,7 @@ endchoice
>> choice
>> prompt "Kernel command line type" if !CMDLINE_OVERRIDE
>> default MIPS_CMDLINE_FROM_DTB if USE_OF && !ATH79 &&
>!MACH_INGENIC && \
>> - !MIPS_MALTA && \
>> + !MACH_LOONGSON64 &&
>!MIPS_MALTA && \
>> !CAVIUM_OCTEON_SOC
>> default MIPS_CMDLINE_FROM_BOOTLOADER
>>
>> diff --git a/arch/mips/boot/dts/Makefile
>b/arch/mips/boot/dts/Makefile
>> index 1e79cab8e269..d429a69bfe30 100644
>> --- a/arch/mips/boot/dts/Makefile
>> +++ b/arch/mips/boot/dts/Makefile
>> @@ -4,6 +4,7 @@ subdir-y += cavium-octeon
>> subdir-y += img
>> subdir-y += ingenic
>> subdir-y += lantiq
>> +subdir-y += loongson
>> subdir-y += mscc
>> subdir-y += mti
>> subdir-y += netlogic
>> diff --git a/arch/mips/boot/dts/loongson/Makefile
>b/arch/mips/boot/dts/loongson/Makefile
>> new file mode 100644
>> index 000000000000..56d379471262
>> --- /dev/null
>> +++ b/arch/mips/boot/dts/loongson/Makefile
>> @@ -0,0 +1,4 @@
>> +# SPDX_License_Identifier: GPL_2.0
>> +dtb-$(CONFIG_MACH_LOONGSON64) += loongson3_4core_rs780e.dtb
>loongson3_8core_rs780e.dtb
>> +
>> +obj-$(CONFIG_BUILTIN_DTB) += $(addsuffix .o, $(dtb-y))
>> diff --git a/arch/mips/boot/dts/loongson/loongson3-package.dtsi
>b/arch/mips/boot/dts/loongson/loongson3-package.dtsi
>> new file mode 100644
>> index 000000000000..d09c313603f1
>> --- /dev/null
>> +++ b/arch/mips/boot/dts/loongson/loongson3-package.dtsi
>> @@ -0,0 +1,62 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +
>> +#include <dt-bindings/interrupt-controller/irq.h>
>> +
>> +/ {
>> + #address-cells = <2>;
>> + #size-cells = <2>;
>> +
>I still add something like this here:
>
> cpu@0 {
> compatible = "loongson,loongson3";
> device_type = "cpu";
> reg = <0x0>;
> next-level-cache = <&scache0>;
> };
>
>Because it at least solve the problem of cache hierarchy, which cause
>"lscpu" crash.
That's another problem.
Previous discussion with rob and Paul all suggested that we shouldn't add cpu node.
At least for now.
>
>> + cpuintc: interrupt-controller {
>> + #address-cells = <0>;
>> + #interrupt-cells = <1>;
>> + interrupt-controller;
>> + compatible = "mti,cpu-interrupt-controller";
>> + };
>> +
>> + package0: bus@...00000 {
>> + compatible = "simple-bus";
>> + #address-cells = <2>;
>> + #size-cells = <1>;
>> + ranges = <0 0x1fe00000 0 0x1fe00000 0x100000
>> + 0 0x3ff00000 0 0x3ff00000 0x100000
>> + 0xefd 0xfb000000 0xefd 0xfb000000 0x10000000
>/* 3A HT Config Space */
>> + 0x1efd 0xfb000000 0x1efd 0xfb000000
>0x10000000 /* 3B HT Config Space */>;
>> +
>> + liointc: interrupt-controller@...01400 {
>> + compatible = "loongson,liointc-1.0";
>> + reg = <0 0x3ff01400 0x64>;
>> +
>> + interrupt-controller;
>> + #interrupt-cells = <2>;
>> +
>> + interrupt-parent = <&cpuintc>;
>> + interrupts = <2>, <3>;
>> + interrupt-names = "int0", "int1";
>> +
>> + loongson,parent_int_map = <0xf0ffffff>, /*
>int0 */
>> + <0x0f000000>, /* int1
>*/
>> + <0x00000000>, /* int2
>*/
>> + <0x00000000>; /* int3
>*/
>> +
>> + };
>> +
>> + cpu_uart0: serial@...001e0 {
>> + compatible = "ns16550a";
>> + reg = <0 0x1fe001e0 0x8>;
>> + clock-frequency = <33000000>;
>> + interrupt-parent = <&liointc>;
>> + interrupts = <10 IRQ_TYPE_LEVEL_HIGH>;
>> + no-loopback-test;
>> + };
>> +
>> + cpu_uart1: serial@...001e8 {
>> + status = "disabled";
>Why disable UART1 by default, is it cause problems?
Yes. It would cause endless suprious interrupt.
And most machine didn't exposed that port.
So I'd prefer disable it.
>
>> + compatible = "ns16550a";
>> + reg = <0 0x1fe001e8 0x8>;
>> + clock-frequency = <33000000>;
>> + interrupts = <10 IRQ_TYPE_LEVEL_HIGH>;
>> + interrupt-parent = <&liointc>;
>> + no-loopback-test;
>> + };
>> + };
>> +};
>> diff --git a/arch/mips/boot/dts/loongson/loongson3_4core_rs780e.dts
>b/arch/mips/boot/dts/loongson/loongson3_4core_rs780e.dts
>> new file mode 100644
>> index 000000000000..6b5694ca0f95
>> --- /dev/null
>> +++ b/arch/mips/boot/dts/loongson/loongson3_4core_rs780e.dts
>> @@ -0,0 +1,25 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +
>> +/dts-v1/;
>> +
>> +#include "loongson3-package.dtsi"
>> +#include "rs780e-pch.dtsi"
>> +
>> +/ {
>> + compatible = "loongson,loongson3-4core-rs780e";
>> +};
>> +
>> +&package0 {
>> + htpic: interrupt-controller@...fb000080 {
>> + compatible = "loongson,htpic-1.0";
>> + reg = <0xefd 0xfb000080 0x40>;
>> + interrupt-controller;
>> + #interrupt-cells = <1>;
>> +
>> + interrupt-parent = <&liointc>;
>> + interrupts = <24 IRQ_TYPE_LEVEL_HIGH>,
>> + <25 IRQ_TYPE_LEVEL_HIGH>,
>> + <26 IRQ_TYPE_LEVEL_HIGH>,
>> + <27 IRQ_TYPE_LEVEL_HIGH>;
>> + };
>> +};
>> diff --git a/arch/mips/boot/dts/loongson/loongson3_8core_rs780e.dts
>b/arch/mips/boot/dts/loongson/loongson3_8core_rs780e.dts
>> new file mode 100644
>> index 000000000000..ffefa2f829b0
>> --- /dev/null
>> +++ b/arch/mips/boot/dts/loongson/loongson3_8core_rs780e.dts
>> @@ -0,0 +1,25 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +
>> +/dts-v1/;
>> +
>> +#include "loongson3-package.dtsi"
>> +#include "rs780e-pch.dtsi"
>> +
>> +/ {
>> + compatible = "loongson,loongson3-8core-rs780e";
>> +};
>> +
>> +&package0 {
>> + htpic: interrupt-controller@...dfb000080 {
>> + compatible = "loongson,htpic-1.0";
>> + reg = <0x1efd 0xfb000080 0x40>;
>> + interrupt-controller;
>> + #interrupt-cells = <1>;
>> +
>> + interrupt-parent = <&liointc>;
>> + interrupts = <24 IRQ_TYPE_LEVEL_HIGH>,
>> + <25 IRQ_TYPE_LEVEL_HIGH>,
>> + <26 IRQ_TYPE_LEVEL_HIGH>,
>> + <27 IRQ_TYPE_LEVEL_HIGH>;
>> + };
>> +};
>> diff --git a/arch/mips/boot/dts/loongson/rs780e-pch.dtsi
>b/arch/mips/boot/dts/loongson/rs780e-pch.dtsi
>> new file mode 100644
>> index 000000000000..45c54d555fa4
>> --- /dev/null
>> +++ b/arch/mips/boot/dts/loongson/rs780e-pch.dtsi
>> @@ -0,0 +1,26 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +
>> +/ {
>> + bus@...00000 {
>> + compatible = "simple-bus";
>> + #address-cells = <2>;
>> + #size-cells = <2>;
>> + ranges = <0 0x10000000 0 0x10000000 0 0x10000000
>> + 0 0x40000000 0 0x40000000 0
>0x40000000
>> + 0xfd 0xfe000000 0xfd 0xfe000000 0
>0x2000000 /* PCI Config Space */>;
>> +
>> + isa {
>> + compatible = "isa";
>> + #address-cells = <2>;
>> + #size-cells = <1>;
>> + ranges = <1 0 0 0 0x1000>;
>> +
>> + rtc0: rtc@70 {
>> + compatible = "motorola,mc146818";
>> + reg = <1 0x70 0x8>;
>> + interrupts = <8>;
>> + interrupt-parent = <&htpic>;
>> + };
>> + };
>> + };
>> +};
>> --
>> 2.26.0.rc2
>>
>>
>
>Regards,
>Huacai
--
Jiaxun Yang
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