Date: Sat, 11 Jan 2020 19:36:27 +0100 From: Emmanuel Vadot <manu@bidouilliste.com> To: Gary Otten <gdotten@gmail.com> Cc: freebsd-arm@freebsd.org Subject: Re: SPI support for A64-OLinuXino board Allwinner A64 processor Message-ID: <20200111193627.6616bc804ef15bbfa341dea0@bidouilliste.com> In-Reply-To: <CABZQu%2BjnY0wU_qbpB30-1hzEFbs8dQcmXBQVyYoFawp6z54Epw@mail.gmail.com> References: <CABZQu%2BivgronnY=ro5CtQoyYR6B=gGFsaryKm%2BgEwubJWx3KzA@mail.gmail.com> <20191228161726.9efb08df5b69eaa0a0ff478f@bidouilliste.com> <CABZQu%2Bg_tRZvj=euDkMTbs4zubB5k1GN%2BT6iidoaxXxBYViwtQ@mail.gmail.com> <20191230123322.fa579638df66e3eac3e16c91@bidouilliste.com> <CABZQu%2BjnY0wU_qbpB30-1hzEFbs8dQcmXBQVyYoFawp6z54Epw@mail.gmail.com>
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On Mon, 30 Dec 2019 16:13:41 -0500
Gary Otten <gdotten@gmail.com> wrote:
> On Mon, Dec 30, 2019 at 6:33 AM Emmanuel Vadot <manu@bidouilliste.com>
> wrote:
>
> > On Sun, 29 Dec 2019 23:40:19 -0500
> > Gary Otten <gdotten@gmail.com> wrote:
> >
> > > Thanks, Ian Lepore mentioned this too, spigen wasn't loaded. I have now
> > > loaded spigen. The driver appears to be working, but I am not seeing
> > any
> > > output.
> > >
> > > I can toggle pins PC0,PC1,PC2, PC3 with gpioctl, but I don't get
> > anything
> > > with spi.
> >
> > You mean settings them as gpio, toggling them and check the pins on
> > the uext port ?
> >
>
> Yes that is correct, toggling them with gpioctl and seeing the voltage
> swing after setting that pin to OUT with gpioctl.
>
> >
> > > I also had another odd behavior with BANK E. not having any output, using
> > > gpoictl, I was not able to get any pin on Bank E to toggle. I did turn on
> > > the voltage regulator as suggested.
> >
> > The SPI pins for SPI0 are on BANKC which is always powered on.
> >
>
> OK, I was mentioning this on the chance that the gpioctl doesn't work with
> BANK E because Bank E is set to work with the csi function on the
> A64-OLinuXino board.
>
> >
> > > I wonder if FreeBSD is properly setting the configuration registers for
> > > each port/pin of the the A64.
> >
> > I'll not say that the code is bug free but this really should be ok,
> > especially for such basic pin setting like spi0 where you only have one
> > pin group.
> >
> > > Basically letting the A64 know to use alt
> > > function or general gpio in/out in the proper way for each pin, maybe
> > some
> > > of the (default?) settings for the more popular pine boards work, but
> > > don't work correctly for the Olimex A64 board, or maybe there is some
> > > setting in the overlays that I am overlooking that need to be set to use
> > an
> > > alt function or gpio in/out to get the pins to function properly. If in
> > > the overlay I have spi0 enabled, should I still be able to toggle the
> > pins
> > > with gpioctl? Thanks for the help.
> >
> > Yes unfortunately the gpio/pinmux code is shared on allwinner and
> > doesn't have all the needed "protection" so you can toggle a pin even
> > if it's not in gpio mode. I don't remember if the value is still output
> > on the physical pin or not.
> >
>
> Yes with SPI enabled in the overlay after a boot, I am still able to set
> the pins to output with gpioctl and see the voltage swing. I must set the
> pins to output to see the voltage swing. Reloading gpio_aw.ko or running
> spi after that doesn't appear to change the fact that the pins are set to
> output as I am still able to run gpioctl and see the toggle.
>
>
> Are you using the -sXM version on the board (where you have an spi
> > flash present on the board) or did you wire something via the uext
> > port ? If the later what's wired and how ?
> >
>
> On my board the flash isn't populated. I wasn't aware of the uext port so I
> just soldered wires on to the pads where the flash would have been, and a
> ground. These wires go to my logic analyzer setup to edge detect. For
> testing I used a loopback (short between) MOSI (PC0) /MISO(PC1)
>
>
> > I have this board but I will not have time to do a proper setup to
> > test something for some time.
> >
>
> Ok that would be great. I will also order a pine board today to have
> another board to test on. Any help or advice would be appreciated. I could
> be making a simple mistake or have the most basic of settings wrong, it
> could be something simple I am overlooking. Is there anyway to read back
> the configuration of a pin from user land? I wonder if anyone else can use
> GPIO pins on bank E on the Olimex A64 board, or has a working SPI on this
> board.
>
> Thanks
I've just tested on my a64-olinuxino using the UEXT port and the
overlay I've just commited (which is the one you wrote).
I've hooked up an spiflash on a breadboard and I can use it properly.
>
>
> > > My diagnostics
> > > ******************************************
> > > root@:/dev # spi -i
> > > Device name: /dev/spigen0.0
> > > Device mode: 2
> > > Device speed: 500000
> > > root@:/dev # spi -d r -m 0 -C '9F 00' -v -c 2
> > > Binary output of 2 bytes
> > > 2 command bytes and 2 data bytes read from SPI device
> > > | 0 1 2 3 4 5 6 7 8 9 A B C D E F |
> > > |
> > > 0 | 00 00 00 00 | ....
> > > |
> > >
> > > I
> > >
> > >
> > >
> > > On Sat, Dec 28, 2019 at 10:44 AM Emmanuel Vadot <manu@bidouilliste.com>
> > > wrote:
> > >
> > > > On Wed, 25 Dec 2019 19:12:28 -0500
> > > > Gary Otten <gdotten@gmail.com> wrote:
> > > >
> > > > > Thanks, I have created the following overlay and tried a variety of
> > > > other
> > > > > things but I haven't been able to get spigen0.0 to appear in /dev.
> > > > >
> > > > >
> > > > >
> > > > > /* $FreeBSD$ */
> > > > > /dts-v1/;
> > > > > /plugin/;
> > > > >
> > > > > / {
> > > > > compatible = "allwinner,sun50i-a64";
> > > > > };
> > > > >
> > > > > &{/soc/spi@1c68000} {
> > > > >
> > > > > status = "okay";
> > > > >
> > > > > spigen0: spigen0 {
> > > > > compatible = "freebsd,spigen";
> > > > > reg = <0>;
> > > > > spi-max-frequency = <500000>;
> > > > > status = "okay";
> > > > > };
> > > > >
> > > > > };
> > > > >
> > > > >
> > > > >
> > > > > Some diagnostics
> > > > >
> > > > > -------------------------------------------------------
> > > > > On Boot
> > > > >
> > > > > Loading DTB overlays: 'sun50i-a64-spi-spidev'
> > > > > /boot/dtb/overlays/sun50i-a64-spi-spidev.dtbo size=0x15c
> > > > > applying DTB overlay '/boot/dtb/overlays/sun50i-a64-spi-spidev.dtbo'
> > > > > ..
> > > > > ....
> > > > > .....
> > > > >
> > > > > Autoloading module: aw_spi.ko
> > > > > aw_spi0: <Allwinner SPI> mem 0x1c68000-0x1c68fff irq 29 on simplebus0
> > > > > spibus0: <OFW SPI bus> on aw_spi0
> > > > > spibus0: <unknown card> at cs 0 mode 0
> > > > >
> > > > >
> > > > > -------------------------------------------------------
> > > > > root@:/boot/dtb/overlays # kldstat
> > > > > Id Refs Address Size Name
> > > > > 1 5 0xffff000000000000 144dda8 kernel
> > > > > 2 1 0xffff000054c00000 41000 aw_spi.ko
> > > > >
> > > > > -------------------------------------------------------
> > > > > root@:/boot/dtb/overlays # devinfo
> > > > > ..
> > > > > ...
> > > > > aw_spi0
> > > > > spibus0
> > > > >
> > > > > -------------------------------------------------------
> > > > > root@:/boot/dtb/overlays # devinfo
> > > > >
> > > > > ....
> > > > > ......
> > > > > Node 0x2f60: spi@1c68000
> > > > > Node 0x309c: spigen0
> > > > > _______________________________________________
> > > > > freebsd-arm@freebsd.org mailing list
> > > > > https://lists.freebsd.org/mailman/listinfo/freebsd-arm
> > > > > To unsubscribe, send any mail to "
> > freebsd-arm-unsubscribe@freebsd.org"
> > > >
> > > > Hi Gary,
> > > >
> > > > You overlay worked for me on the pine64-lts. Here is what I did :
> > > > - Use https://github.com/evadot/freebsd/commits/aw_spigen
> > > > - aw_spi is autoloaded via devmatch
> > > > - kldload spigen (it's not in GENERIC for arm64, maybe we should add
> > it
> > > > or do some devmatch magic)
> > > > - root@pine64-lts:~ # spi -i
> > > > Device name: /dev/spigen0.0
> > > > Device mode: 0
> > > > Device speed: 500000
> > > > root@pine64-lts:~ # spi -d r -m 0 -C '9F 00' -v -c 2
> > > > Binary output of 2 bytes
> > > > 2 command bytes and 2 data bytes read from SPI device
> > > > | 0 1 2 3 4 5 6 7 8 9 A B C D E F
> > > > | | 0 | 00 ef 40 18
> > |
> > > > ..@. |
> > > >
> > > > Maybe you just forgot to load spigen ?
> > > >
> > > > --
> > > > Emmanuel Vadot <manu@bidouilliste.com> <manu@freebsd.org>
> > > >
> >
> >
> > --
> > Emmanuel Vadot <manu@bidouilliste.com>
> >
--
Emmanuel Vadot <manu@bidouilliste.com> <manu@freebsd.org>
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