On Tue, Apr 16, 2019 at 4:24 PM Christian Mauderer < [email protected]> wrote:
> Am 16.04.19 um 11:28 schrieb Vijay Kumar Banerjee: > > > > > > > > On Fri, Apr 12, 2019 at 9:16 PM Christian Mauderer <[email protected] > > <mailto:[email protected]>> wrote: > > > > Am 12.04.19 um 16:26 schrieb Vijay Kumar Banerjee: > > > > > > > > > On Wed, Apr 10, 2019 at 12:50 PM Christian Mauderer > > > <[email protected] > > <mailto:[email protected]> > > > <mailto:[email protected] > > <mailto:[email protected]>>> wrote: > > > > > > Am 09.04.19 um 18:12 schrieb Vijay Kumar Banerjee: > > > > Hi, > > > > > > > > I have imported and ported the the drivers in 2 pairs(import > > and port) > > > > of commits > > > > for each one. Please have a look at this branch > > > > https://github.com/thelunatic/rtems-libbsd/commits/tda19988 > > > > > > One detail: You have a commit named "tda19988.c: import from > > FreeBSD". > > > Please remove the ".c". > > > > > > Noted. > > > > > > Maybe it would be a good idea to split of the I2C part and put > > it in > > > front of the other two parts. You can develop and test that > > independent > > > with a test that just accesses some of the I2C devices on the > > board via > > > the FreeBSD API and the translation driver discussed below. > > > > > > This is a good idea, I'll import iicbus separately and add the > other > > > two on top of it. > > > > > > > > > > > I have also tried running the media01.exe and have seen it > > running > > > fine > > > > without > > > > throwing any exceptions. > > > > > > > > I have used the fb.c and iicbus.c codes from the > > freebsd source. From > > > > what I > > > > understand, I think the next big steps would be to write an > > RTEMS > > > > implementation layer for these portions of the code? And > then a > > > test in the > > > > libbsd, like media01, to write to the /dev/fb0 > > > > > > > > Can you please help me chalk out a rough outline of the next > > set of > > > > actions? :) > > > > > > As far as I can tell, there are two possible I2C buses here: > > > > > > 1. The one between the AM335x and the TDA19988. > > > > > > 2. The one directly on the HDMI connector (called HDMI_DSCL and > > > HDMI_DSDA). I assume that's an I2C bus too. > > > > > > For 1. the RTEMS driver should be used. You'll need some code > that > > > translates the FreeBSD API to the one used in RTEMS. Basically > > that will > > > just be a FreeBSD-I2C-driver. > > > > > > For 2: If that even is an independent I2C bus, you can use the > > driver > > > provided by FreeBSD. I don't think that it is necessary to > > translate to > > > the RTEMS API here. > > > > > > I had a look at the iic and iicbus codes in freebsd and the > bbb-i2c.c > > > This looks very confusing to me. Are we looking for something like > a > > > rtems-iicbus.c in the rtemsbsd that works like a wrapper to the > > bbb-i2c > > > code, and uses the freebsd api of DEVMETHODs? > > > > Yes correct. Basically it would be necessary to have a I2C device > driver > > for FreeBSD that translates to the RTEMS API. > > > > > > > > I've not been able to figure out at one look, how to relate them > and > > > get a wrapper like that. Any suggestions on how to approach this? > > > > I haven't had a look at the FreeBSD drivers yet. The first part that > I > > would have a look at is the description of the user facing FreeBSD > API: > > > > > https://www.freebsd.org/cgi/man.cgi?query=iic&apropos=0&sektion=0&manpath=FreeBSD+12.0-RELEASE+and+Ports&arch=default&format=html > > > > Nice thing: They use a struct iic_msg that is compatible with Linux's > > struct i2c_msg (according to the man page). We are Linux compatible > too. > > Can be a big advantage. > > > > Then take a look at the simplest i2c driver that you can find in > FreeBSD > > that uses the transfer API. > > freebsd-org/sys/dev/drm2/radeon/atombios_i2c.c looks good to me. > > Basically you have to implement the following functions (replace > > radeon_atom... by a useful prefix): > > > > static device_method_t radeon_atom_hw_i2c_methods[] = { > > DEVMETHOD(device_probe, radeon_atom_hw_i2c_probe), > > DEVMETHOD(device_attach, radeon_atom_hw_i2c_attach), > > DEVMETHOD(device_detach, radeon_atom_hw_i2c_detach), > > DEVMETHOD(iicbus_reset, radeon_atom_hw_i2c_reset), > > DEVMETHOD(iicbus_transfer, radeon_atom_hw_i2c_xfer), > > DEVMETHOD_END > > }; > > > > The iicbus_transfer function seems to get a struct iic_msg as a > > parameter. Now that's really lucky. > > > > With that you should be able to open the i2c device in RTEMS and just > > pass the structure via the correct ioctl call to the RTEMS driver. > > > > Basically you just have to pass the bus to use as a parameter to the > > driver. Take a look at some of the other drivers in nexus-devices.h > that > > have for example an address as a parameter to see how you can do > that. > > > > This gave a good idea of the objective. :) > > > > I had a look at the bbb-i2c.c code and how it's registering > > and setting up the i2c_bus struct with the transfer, set and destroy > > fucntions. > > I have a question from the fundamentals, the only function > > of bbb-i2c.c > > <https://git.rtems.org/rtems/tree/bsps/arm/beagle/i2c/bbb-i2c.c#n414> > > that is 'accessible' with the header file is am335x_i2c_bus_register > > which basically sets the i2c_bus struct > > and calls the i2c_bus_register function from the dev/i2c.c . > > To use the DEVMETHOD api, we need to be able to call the > > transfer, destroy etc. functions of the bbb-i2c.c from the translation > > layer in rtemsbsd. How do I #include the bbb-i2c.c in the new > > translation driver that I'll write? > > > > Hope my question is stated clearly, please correct me if I'm getting > > some fundamentals wrong. > > You are not fundamentally wrong but slightly off: > > Regarding the question how you access transfer, destroy, ... of the > driver directly: Don't. > > You basically don't need to have a look at the bbb-i2c.c file of RTEMS > for that driver. Where you should have a look is the Linux I2C API > (which has been the model for the RTEMS API). > > Basically your drivers transfer function will do about the following: > > - Open "/dev/i2c0" (or some other path - that will be a parameter to the > driver and has to be stored by probe or attach in some device structure). > > - Translate the "struct iic_msg" you get as an input to a "struct > i2c_msg". Most likely that's just a cast. > > - Pass that via an ioctl call to the opened bus. > > - Check return value and translate to the matching return of FreeBSD. > > - Close "/dev/i2c0" > > Some of the open / close might could move to attach / detach. But that > would be an optimization. > > That driver will work on any BSP that implements the current i2c API. So > it's a generic translation layer. > > Best regards > > Christian > > Hi! I started writing the driver layer implementation in the rtemsbsd, is this going in the right direction < https://gist.github.com/thelunatic/2d8a2bf2cbead5bf82abe09000afea56> ? > > > > > > > > Can we not totally use the iicbus in the freebsd source? > > > > We already have a I2C driver for that BSP in RTEMS. If you would use > the > > FreeBSD code, they would fight for the hardware. Of course it would > be > > possible to replace the RTEMS driver by a FreeBSD one. But that would > > potentially break some applications. Besides that I think that a lot > of > > RTEMS BSPs already have an I2C driver so a generic wrapper could be > > helpful for other BSPs too. > > > > > > > > > > > > > Thanks > > > > > > > > On Tue, Apr 9, 2019 at 5:28 AM Chris Johns <[email protected] > > <mailto:[email protected]> > > > <mailto:[email protected] <mailto:[email protected]>> > > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>>> wrote: > > > > > > > > On 8/4/19 12:30 am, Vijay Kumar Banerjee wrote: > > > > > On Sun, Apr 7, 2019 at 6:24 PM Christian Mauderer > > > > <[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>> > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>> > > > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>> > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>>>> wrote: > > > > > Am 07.04.19 um 14:50 schrieb Vijay Kumar Banerjee: > > > > > > On Sun, Apr 7, 2019 at 6:08 PM Christian Mauderer > > > > <[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>> > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>> > > > > > <mailto:[email protected] > > <mailto:[email protected]> <mailto:[email protected] > > <mailto:[email protected]>> > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>>> > > > > > > <mailto:[email protected] > > <mailto:[email protected]> <mailto:[email protected] > > <mailto:[email protected]>> > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>> > > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>> > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>>>>> wrote: > > > > > > Am 07.04.19 um 14:35 schrieb Vijay Kumar > > Banerjee: > > > > > > > On Sun, Apr 7, 2019 at 5:37 PM Christian > > Mauderer > > > > > > <[email protected] > > <mailto:[email protected]> <mailto:[email protected] > > <mailto:[email protected]>> > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>> > > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>> > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>>> > > > > > <mailto:[email protected] > > <mailto:[email protected]> <mailto:[email protected] > > <mailto:[email protected]>> > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>> > > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>> > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>>>> > > > > > > > <mailto:[email protected] > > <mailto:[email protected]> > > > <mailto:[email protected] <mailto:[email protected]>> > > <mailto:[email protected] <mailto:[email protected]> > > > <mailto:[email protected] <mailto:[email protected]>>> > > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>> > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>>> > > > > > <mailto:[email protected] > > <mailto:[email protected]> <mailto:[email protected] > > <mailto:[email protected]>> > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>> > > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>> > > > <mailto:[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>>>>>> wrote: > > > > > > > Am 07.04.19 um 13:08 schrieb Vijay > Kumar > > > Banerjee: > > > > > > > > > > I don't think that there are a lot of docs for how > > to test. > > > > Although I'm > > > > > sure that there are some scripts to run a number > > of libbsd > > > > tests, I'm > > > > > not sure where. Maybe in the RTEMS tester but I > think > > > that is > > > > mainly for > > > > > the core tests? > > > > > > > > The documentation for testing can be found here ... > > > > > > > > > > https://docs.rtems.org/branches/master/user/testing/index.html > > > > > > > > > so far I know, RTEMS Tester is only for core tests. > > > > > > > > The `rtems-test` command checks the for test start and > end > > > banners. > > > > I am not > > > > sure if libbsd supports the test banners. Maybe it could > > now with > > > > Sebastian's > > > > movement of the test support code into libtest. > > > > > > > > > I'll ask in the devel if there's some way to run > > libbsd test > > > with > > > > the tester. > > > > > > > > There is the `rtems-run` command which has similar args > to > > > > `rtems-test`. It does > > > > suffer from a limitation I have not fixed which is stdin > > is not > > > > passed through > > > > to the console of the target. I also think the command > has a > > > timeout > > > > running, > > > > but I am not sure about this one. > > > > > > > > Chris > > > > > > > > > > -- > > > -------------------------------------------- > > > embedded brains GmbH > > > Herr Christian Mauderer > > > Dornierstr. 4 > > > D-82178 Puchheim > > > Germany > > > email: [email protected] > > <mailto:[email protected]> > > > <mailto:[email protected] > > <mailto:[email protected]>> > > > Phone: +49-89-18 94 741 - 18 > > > Fax: +49-89-18 94 741 - 08 > > > PGP: Public key available on request. > > > > > > Diese Nachricht ist keine geschäftliche Mitteilung im Sinne > > des EHUG. > > > > > > > -- > -------------------------------------------- > embedded brains GmbH > Herr Christian Mauderer > Dornierstr. 4 > D-82178 Puchheim > Germany > email: [email protected] > Phone: +49-89-18 94 741 - 18 > Fax: +49-89-18 94 741 - 08 > PGP: Public key available on request. > > Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG. >
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