Re: [RFC PATCH 2/3] RISC-V: Initial DTS for Microchip ICICLE board

From: Atish Patra
Date: Tue Nov 03 2020 - 10:07:57 EST

On Fri, Oct 30, 2020 at 2:20 PM Ben Dooks <ben.dooks@xxxxxxxxxxxxxxx> wrote:
>
> On 30/10/2020 07:11, Atish Patra wrote:
> > On Thu, Oct 29, 2020 at 3:24 AM Ben Dooks <ben.dooks@xxxxxxxxxxxxxxx> wrote:
> >>
> >> On 28/10/2020 23:27, Atish Patra wrote:
> >>> Add initial DTS for Microchip ICICLE board having only
> >>> essential devcies (clocks, sdhci, ethernet, serial, etc).
> >>>
> >>> Signed-off-by: Atish Patra <atish.patra@xxxxxxx>
> >>> ---
> >>> arch/riscv/boot/dts/Makefile | 1 +
> >>> arch/riscv/boot/dts/microchip/Makefile | 2 +
> >>> .../microchip/microchip-icicle-kit-a000.dts | 313 ++++++++++++++++++
> >>> 3 files changed, 316 insertions(+)
> >>> create mode 100644 arch/riscv/boot/dts/microchip/Makefile
> >>> create mode 100644 arch/riscv/boot/dts/microchip/microchip-icicle-kit-a000.dts
> >>>
> >>> diff --git a/arch/riscv/boot/dts/Makefile b/arch/riscv/boot/dts/Makefile
> >>> index ca1f8cbd78c0..3ea94ea0a18a 100644
> >>> --- a/arch/riscv/boot/dts/Makefile
> >>> +++ b/arch/riscv/boot/dts/Makefile
> >>> @@ -1,5 +1,6 @@
> >>> # SPDX-License-Identifier: GPL-2.0
> >>> subdir-y += sifive
> >>> subdir-y += kendryte
> >>> +subdir-y += microchip
> >>>
> >>> obj-$(CONFIG_BUILTIN_DTB) := $(addsuffix /, $(subdir-y))
> >>> diff --git a/arch/riscv/boot/dts/microchip/Makefile b/arch/riscv/boot/dts/microchip/Makefile
> >>> new file mode 100644
> >>> index 000000000000..55ad77521304
> >>> --- /dev/null
> >>> +++ b/arch/riscv/boot/dts/microchip/Makefile
> >>> @@ -0,0 +1,2 @@
> >>> +# SPDX-License-Identifier: GPL-2.0
> >>> +dtb-$(CONFIG_SOC_MICROCHIP_POLARFIRE) += microchip-icicle-kit-a000.dtb
> >>> diff --git a/arch/riscv/boot/dts/microchip/microchip-icicle-kit-a000.dts b/arch/riscv/boot/dts/microchip/microchip-icicle-kit-a000.dts
> >>> new file mode 100644
> >>> index 000000000000..5848920af55c
> >>> --- /dev/null
> >>> +++ b/arch/riscv/boot/dts/microchip/microchip-icicle-kit-a000.dts
> >>> @@ -0,0 +1,313 @@
> >>> +// SPDX-License-Identifier: GPL-2.0+
> >>> +/* Copyright (c) 2020 Microchip Technology Inc */
> >>> +
> >>> +/dts-v1/;
> >>> +
> >>> +/* Clock frequency (in Hz) of the rtcclk */
> >>> +#define RTCCLK_FREQ 1000000
> >>> +
> >>> +/ {
> >>> + #address-cells = <2>;
> >>> + #size-cells = <2>;
> >>> + model = "Microchip PolarFire-SoC";
> >>> + compatible = "microchip,polarfire-soc";
> >>> +
> >>> + chosen {
> >>> + stdout-path = &serial0;
> >>> + };
> >>> +
> >>> + cpus {
> >>> + #address-cells = <1>;
> >>> + #size-cells = <0>;
> >>> + timebase-frequency = <RTCCLK_FREQ>;
> >>> +
> >>> + cpu@0 {
> >>> + clock-frequency = <0>;
> >>> + compatible = "sifive,rocket0", "riscv";
> >>> + device_type = "cpu";
> >>> + i-cache-block-size = <64>;
> >>> + i-cache-sets = <128>;
> >>> + i-cache-size = <16384>;
> >>> + reg = <0>;
> >>> + riscv,isa = "rv64imac";
> >>> + status = "disabled";
> >>> +
> >>> + cpu0_intc: interrupt-controller {
> >>> + #interrupt-cells = <1>;
> >>> + compatible = "riscv,cpu-intc";
> >>> + interrupt-controller;
> >>> + };
> >>> + };
> >>> +
> >>> + cpu@1 {
> >>> + clock-frequency = <0>;
> >>> + compatible = "sifive,rocket0", "riscv";
> >>> + d-cache-block-size = <64>;
> >>> + d-cache-sets = <64>;
> >>> + d-cache-size = <32768>;
> >>> + d-tlb-sets = <1>;
> >>> + d-tlb-size = <32>;
> >>> + device_type = "cpu";
> >>> + i-cache-block-size = <64>;
> >>> + i-cache-sets = <64>;
> >>> + i-cache-size = <32768>;
> >>> + i-tlb-sets = <1>;
> >>> + i-tlb-size = <32>;
> >>> + mmu-type = "riscv,sv39";
> >>> + reg = <1>;
> >>> + riscv,isa = "rv64imafdc";
> >>> + tlb-split;
> >>> + status = "okay";
> >>> +
> >>> + cpu1_intc: interrupt-controller {
> >>> + #interrupt-cells = <1>;
> >>> + compatible = "riscv,cpu-intc";
> >>> + interrupt-controller;
> >>> + };
> >>> + };
> >>> +
> >>> + cpu@2 {
> >>> + clock-frequency = <0>;
> >>> + compatible = "sifive,rocket0", "riscv";
> >>> + d-cache-block-size = <64>;
> >>> + d-cache-sets = <64>;
> >>> + d-cache-size = <32768>;
> >>> + d-tlb-sets = <1>;
> >>> + d-tlb-size = <32>;
> >>> + device_type = "cpu";
> >>> + i-cache-block-size = <64>;
> >>> + i-cache-sets = <64>;
> >>> + i-cache-size = <32768>;
> >>> + i-tlb-sets = <1>;
> >>> + i-tlb-size = <32>;
> >>> + mmu-type = "riscv,sv39";
> >>> + reg = <2>;
> >>> + riscv,isa = "rv64imafdc";
> >>> + tlb-split;
> >>> + status = "okay";
> >>> +
> >>> + cpu2_intc: interrupt-controller {
> >>> + #interrupt-cells = <1>;
> >>> + compatible = "riscv,cpu-intc";
> >>> + interrupt-controller;
> >>> + };
> >>> + };
> >>> +
> >>> + cpu@3 {
> >>> + clock-frequency = <0>;
> >>> + compatible = "sifive,rocket0", "riscv";
> >>> + d-cache-block-size = <64>;
> >>> + d-cache-sets = <64>;
> >>> + d-cache-size = <32768>;
> >>> + d-tlb-sets = <1>;
> >>> + d-tlb-size = <32>;
> >>> + device_type = "cpu";
> >>> + i-cache-block-size = <64>;
> >>> + i-cache-sets = <64>;
> >>> + i-cache-size = <32768>;
> >>> + i-tlb-sets = <1>;
> >>> + i-tlb-size = <32>;
> >>> + mmu-type = "riscv,sv39";
> >>> + reg = <3>;
> >>> + riscv,isa = "rv64imafdc";
> >>> + tlb-split;
> >>> + status = "okay";
> >>> +
> >>> + cpu3_intc: interrupt-controller {
> >>> + #interrupt-cells = <1>;
> >>> + compatible = "riscv,cpu-intc";
> >>> + interrupt-controller;
> >>> + };
> >>> + };
> >>> +
> >>> + cpu@4 {
> >>> + clock-frequency = <0>;
> >>> + compatible = "sifive,rocket0", "riscv";
> >>> + d-cache-block-size = <64>;
> >>> + d-cache-sets = <64>;
> >>> + d-cache-size = <32768>;
> >>> + d-tlb-sets = <1>;
> >>> + d-tlb-size = <32>;
> >>> + device_type = "cpu";
> >>> + i-cache-block-size = <64>;
> >>> + i-cache-sets = <64>;
> >>> + i-cache-size = <32768>;
> >>> + i-tlb-sets = <1>;
> >>> + i-tlb-size = <32>;
> >>> + mmu-type = "riscv,sv39";
> >>> + reg = <4>;
> >>> + riscv,isa = "rv64imafdc";
> >>> + tlb-split;
> >>> + status = "okay";
> >>> + cpu4_intc: interrupt-controller {
> >>> + #interrupt-cells = <1>;
> >>> + compatible = "riscv,cpu-intc";
> >>> + interrupt-controller;
> >>> + };
> >>> + };
> >>> + };
> >>> +
> >>> + memory@80000000 {
> >>> + device_type = "memory";
> >>> + reg = <0x0 0x80000000 0x0 0x40000000>;
> >>> + clocks = <&clkcfg 26>;
> >>> + };
> >>
> >> U-boot doesn't seem to be updating this properly.
> >>
> >> The board should have 2GiB, confirmed by looking at the device's
> >> chip markings. We only see 1GiB memory. The 0x80000000 bus window
> >> is only capable of dealing with 1GiB memory. The higher 64-bit one
> >> can have 16GiB mapped.
> >>
> >> Do we need a second node for the second GiB of memory?
> >>
> > We could just modify the reg size but to allow more memory. I tried
> > that for Linux but it didn't boot.
> > Probably, DDR init code in HSS only initialized 1GB of memory.
>
> Yes, it is only looking at the low window which is 1GiB max.
> If it used the upper window it would get the 16GiB.
>
> I don't know how no-one noticed this issue before shipping a board
> out with this. I have updated the firmware on my second board but
> this only seems to currently fix a reboot issue with the eMMC.
>

We can't update the DT for Linux until there is a public release of
the updated firmware
with 2GB enabled.

> >>> +
> >>> + soc {
> >>> + #address-cells = <2>;
> >>> + #size-cells = <2>;
> >>> + compatible = "simple-bus";
> >>> + ranges;
> >>> +
> >>> + cache-controller@2010000 {
> >>> + compatible = "sifive,fu540-c000-ccache", "cache";
> >>> + cache-block-size = <64>;
> >>> + cache-level = <2>;
> >>> + cache-sets = <1024>;
> >>> + cache-size = <2097152>;
> >>> + cache-unified;
> >>> + interrupt-parent = <&plic>;
> >>> + interrupts = <1 2 3>;
> >>> + reg = <0x0 0x2010000 0x0 0x1000>;
> >>> + };
> >>> +
> >>> + clint@2000000 {
> >>> + compatible = "riscv,clint0";
> >>> + reg = <0x0 0x2000000 0x0 0xC000>;
> >>> + interrupts-extended = <&cpu0_intc 3 &cpu0_intc 7
> >>> + &cpu1_intc 3 &cpu1_intc 7
> >>> + &cpu2_intc 3 &cpu2_intc 7
> >>> + &cpu3_intc 3 &cpu3_intc 7
> >>> + &cpu4_intc 3 &cpu4_intc 7>;
> >>> + };
> >>> +
> >>> + plic: interrupt-controller@c000000 {
> >>> + #interrupt-cells = <1>;
> >>> + compatible = "sifive,plic-1.0.0";
> >>> + reg = <0x0 0xc000000 0x0 0x4000000>;
> >>> + riscv,ndev = <53>;
> >>> + interrupt-controller;
> >>> + interrupts-extended = <&cpu0_intc 11
> >>> + &cpu1_intc 11 &cpu1_intc 9
> >>> + &cpu2_intc 11 &cpu2_intc 9
> >>> + &cpu3_intc 11 &cpu3_intc 9
> >>> + &cpu4_intc 11 &cpu4_intc 9>;
> >>> + };
> >>> +
> >>> + dma@3000000 {
> >>> + compatible = "sifive,fu540-c000-pdma";
> >>> + reg = <0x0 0x3000000 0x0 0x8000>;
> >>> + interrupt-parent = <&plic>;
> >>> + interrupts = <23 24 25 26 27 28 29 30>;
> >>> + #dma-cells = <1>;
> >>> + };
> >>> +
> >>> + refclk: refclk {
> >>> + compatible = "fixed-clock";
> >>> + #clock-cells = <0>;
> >>> + clock-frequency = <600000000>;
> >>> + clock-output-names = "msspllclk";
> >>> + };
> >>> +
> >>> + clkcfg: clkcfg@20002000 {
> >>> + compatible = "microchip,pfsoc-clkcfg";
> >>> + reg = <0x0 0x20002000 0x0 0x1000>;
> >>> + reg-names = "mss_sysreg";
> >>> + clocks = <&refclk>;
> >>> + #clock-cells = <1>;
> >>> + clock-output-names = "cpuclk", "axiclk", "ahbclk", "ENVMclk", "MAC0clk", "MAC1clk", "MMCclk", "TIMERclk", "MMUART0clk", "MMUART1clk", "MMUART2clk", "MMUART3clk", "MMUART4clk", "SPI0clk", "SPI1clk", "I2C0clk", "I2C1clk", "CAN0clk", "CAN1clk", "USBclk", "RESERVED", "RTCclk", "QSPIclk", "GPIO0clk", "GPIO1clk", "GPIO2clk", "DDRCclk", "FIC0clk", "FIC1clk", "FIC2clk", "FIC3clk", "ATHENAclk", "CFMclk";
> >>
> >> Any chance of making this list multi-line, it is difficult to read as-is.
> >>
> >
> > Yes. We can also get rid of a few names that are not used. I will fix it in v2.
> >
> >>> + };
> >>> +
> >>> + serial0: serial@20000000 {
> >>> + compatible = "ns16550a";
> >>> + reg = <0x0 0x20000000 0x0 0x400>;
> >>> + reg-io-width = <4>;
> >>> + reg-shift = <2>;
> >>> + interrupt-parent = <&plic>;
> >>> + interrupts = <90>;
> >>> + current-speed = <115200>;
> >>> + clocks = <&clkcfg 8>;
> >>> + status = "okay";
> >>> + };
> >>> +
> >>> + serial1: serial@20100000 {
> >>> + compatible = "ns16550a";
> >>> + reg = <0x0 0x20100000 0x0 0x400>;
> >>> + reg-io-width = <4>;
> >>> + reg-shift = <2>;
> >>> + interrupt-parent = <&plic>;
> >>> + interrupts = <91>;
> >>> + current-speed = <115200>;
> >>> + clocks = <&clkcfg 9>;
> >>> + status = "okay";
> >>> + };
> >>> +
> >>> + serial2: serial@20102000 {
> >>> + compatible = "ns16550a";
> >>> + reg = <0x0 0x20102000 0x0 0x400>;
> >>> + reg-io-width = <4>;
> >>> + reg-shift = <2>;
> >>> + interrupt-parent = <&plic>;
> >>> + interrupts = <92>;
> >>> + current-speed = <115200>;
> >>> + clocks = <&clkcfg 10>;
> >>> + status = "okay";
> >>> + };
> >>> +
> >>> + serial3: serial@20104000 {
> >>> + compatible = "ns16550a";
> >>> + reg = <0x0 0x20104000 0x0 0x400>;
> >>> + reg-io-width = <4>;
> >>> + reg-shift = <2>;
> >>> + interrupt-parent = <&plic>;
> >>> + interrupts = <93>;
> >>> + current-speed = <115200>;
> >>> + clocks = <&clkcfg 11>;
> >>> + status = "okay";
> >>> + };
> >>> +
> >>> + sdcard: sdhc@20008000 {
> >>> + compatible = "cdns,sd4hc";
> >>> + reg = <0x0 0x20008000 0x0 0x1000>;
> >>> + interrupt-parent = <&plic>;
> >>> + interrupts = <88>;
> >>> + pinctrl-names = "default";
> >>> + clocks = <&clkcfg 6>;
> >>> + bus-width = <4>;
> >>> + disable-wp;
> >>> + no-1-8-v;
> >>> + cap-mmc-highspeed;
> >>> + cap-sd-highspeed;
> >>> + card-detect-delay = <200>;
> >>> + sd-uhs-sdr12;
> >>> + sd-uhs-sdr25;
> >>> + sd-uhs-sdr50;
> >>> + sd-uhs-sdr104;
> >>> + max-frequency = <200000000>;
> >>> + status = "okay";
> >>> + };
> >>
> >> Given eMMC is the default device, shouldn't that be default for the
> >> device tree too? Even if not, having the emmc node here would be a
> >> good thing as it is different to the SD node.
> >>
> >
> > I tested this device tree with sdcard. That's why, I just picked the
> > sdcard node.
> > I am not sure if both eMMC & sdcard node can co-exist. The polar fire
> > soc github repo
> > seems to point that both of them have the same address and only 1 can be enabled
> > at that time. That may not be true now as the github repo has not been
> > updated in
> > couple of months.
> >
> > @Cyril : Can we enable both eMMC & sdcard at the same time ?
>
> I would put /both/ in but only enable the one in use for the moment.
> Our boards are booting of eMMC as supplied, so this isn't going to work
> as well. The eMMC is 8bit wide, and thus is only delivering 11MB/sec
> instead of 22MB/sec. This performance is still not great, but losing
> half the data-rate is just not good.
>

I am not sure what should be enabled by default. Updating sdcard is much
easier than eMMC card and we use that approach.

@Cyril: Is there a way that we can enable both ?

> >>> +
> >>> + emac1: ethernet@20112000 {
> >>> + compatible = "cdns,macb";
> >>> + reg = <0x0 0x20112000 0x0 0x2000>;
> >>> + interrupt-parent = <&plic>;
> >>> + interrupts = <70 71 72 73>;
> >>> + mac-address = [56 34 12 00 FC 00];
> >>> + phy-mode = "sgmii";
> >>> + clocks = <&clkcfg 5>, <&clkcfg 2>;
> >>> + clock-names = "pclk", "hclk";
> >>> + #address-cells = <1>;
> >>> + #size-cells = <0>;
> >>> + phy1: ethernet-phy@9 {
> >>> + reg = <9>;
> >>> + ti,fifo-depth = <0x01>;
> >>> + };
> >>> + };
> >>
> >> Aren't there two ethernet ports on the board?
> >>
> >
> > Yes. I hadn't tested that out. I will test it and add the 2nd one as well.
> >
> >> Also, at the moment u-boot is not filling the MAC address parameter
> >> in so we've got at two boards on the network with the same MAC until
> >> we override it in the device tree for the second.
> >>
> >
> > Looking at latest U-Boot patches, it seems it updates the mac address
> > from the serial number.
>
> Ok, the one supplied on the boards does not. And the boards /both/ have
> the same MAC address!
>
Yeah. That one is hard coded. I think that will be fixed with U-Boot patches.
We can just leave them all 0s in Linux DT.

> >>> +
> >>> + uio_axi_lsram@2030000000 {
> >>> + compatible = "generic-uio";
> >>> + reg = <0x20 0x30000000 0 0x80000000 >;
> >>> + status = "okay";
> >>> + };
> >>> + };
> >>> +};
> >>>
> >>
> >>
> >> --
> >> Ben Dooks http://www.codethink.co.uk/
> >> Senior Engineer Codethink - Providing Genius
> >>
> >> https://www.codethink.co.uk/privacy.html
> >>
> >> _______________________________________________
> >> linux-riscv mailing list
> >> linux-riscv@xxxxxxxxxxxxxxxxxxx
> >> http://lists.infradead.org/mailman/listinfo/linux-riscv
> >
> >
> >
>
>
> --
> Ben Dooks http://www.codethink.co.uk/
> Senior Engineer Codethink - Providing Genius
>
> https://www.codethink.co.uk/privacy.html
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@xxxxxxxxxxxxxxxxxxx
> http://lists.infradead.org/mailman/listinfo/linux-riscv



--
Regards,
Atish