powerpc port for sbc8260-based board problem

powerpc port for sbc8260-based board problem

[Boris Shteinbock]

Hi.
I am doing a port from ppc to powerpc ARCH on sbc8260 based board.
The problem is, that I can't get  SMC1 UART to work.
After SMC console  is initialized.  
cpm_uart_console_write() hangs here

        /* Wait for transmitter fifo to empty.
         * Ready indicates output is ready, and xmt is doing
         * that, not that it is ready for us to send.
         */
        while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
            ;

I am using dts tree modified  from ep8248 port since it is the only one that has smc description in it. :


     brg@119f0 {
       compatible = "fsl,mpc8260-brg",
                    "fsl,cpm2-brg",
                    "fsl,cpm-brg";
       reg = <119f0 10 115f0 10>;
       clock-frequency = <135000000>;
       
     };

     /* Monitor port/SMC1 */
     smc1: serial@11a80 {
       device_type = "serial";
       compatible = "fsl,mpc8260-smc-uart",
                    "fsl,cpm2-smc-uart";
       reg = <0x11a80 0x20 0x1100 0x40>;
       interrupts = <4 8>;
       interrupt-parent = <&PIC>;
       fsl,cpm-brg = <1>;
       fsl,cpm-command = <0x1d000000>;
       linux,my-label = "SMC1";
     };

I checked a BRG settings against working u-boot configuration and they are the same. Anyway a wrong BRG setting wouldn't hang this loop

So I have a few questions.
If someone has done sbc8260 dts tree and port to "powerpc" already, I'd be very  grateful if he can share it with me.
I couldn't find anything on the internet.

Can someone, also, explain, how "fsl, cpm-command" field works,  booting-without-of document doesn't provide much information.
I feel, that just copying this value from ep8248.dts isn't right somehow.

Thank you


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Re: powerpc port for sbc8260-based board problem

[Sergej Stepanov]

Hallo.

I had the same problem.
The following patch can help.

diff -pruN paulus-git/drivers/serial/cpm_uart/cpm_uart_core.c linuxppc-2.6.=
24-ids8247/drivers/serial/cpm_uart/cpm_uart_core.c
--- paulus-git/drivers/serial/cpm_uart/cpm_uart_core.c	2008-03-28 11:03:32.=
000000000 +0100
+++ linuxppc-2.6.24-ids8247/drivers/serial/cpm_uart/cpm_uart_core.c	2008-05=
-07 19:35:21.000000000 +0200
@@ -1350,6 +1349,9 @@ static int __init cpm_uart_console_setup
 	uart_set_options(port, co, baud, parity, bits, flow);
 	cpm_line_cr_cmd(pinfo, CPM_CR_RESTART_TX);
=20
+#ifndef CONFIG_PPC_EARLY_DEBUG_CPM
+	cpm_set_brg(pinfo->brg - 1, baud);
+#endif
 	return 0;
 }
=20
Regards
Sergej.

Am Mittwoch, den 07.05.2008, 01:31 -0700 schrieb Boris Shteinbock:
> Hi.
> I am doing a port from ppc to powerpc ARCH on sbc8260 based board.
> The problem is, that I can't get  SMC1 UART to work.
> After SMC console  is initialized. =20
> cpm_uart_console_write() hangs here
>=20
>         /* Wait for transmitter fifo to empty.
>          * Ready indicates output is ready, and xmt is doing
>          * that, not that it is ready for us to send.
>          */
>         while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) !=3D 0)
>             ;
>=20
> I am using dts tree modified  from ep8248 port since it is the only one t=
hat has smc description in it. :
>=20
>=20
>      brg@119f0 {
>        compatible =3D "fsl,mpc8260-brg",
>                     "fsl,cpm2-brg",
>                     "fsl,cpm-brg";
>        reg =3D <119f0 10 115f0 10>;
>        clock-frequency =3D <135000000>;
>       =20
>      };
>=20
>      /* Monitor port/SMC1 */
>      smc1: serial@11a80 {
>        device_type =3D "serial";
>        compatible =3D "fsl,mpc8260-smc-uart",
>                     "fsl,cpm2-smc-uart";
>        reg =3D <0x11a80 0x20 0x1100 0x40>;
>        interrupts =3D <4 8>;
>        interrupt-parent =3D <&PIC>;
>        fsl,cpm-brg =3D <1>;
>        fsl,cpm-command =3D <0x1d000000>;
>        linux,my-label =3D "SMC1";
>      };
>=20
> I checked a BRG settings against working u-boot configuration and they ar=
e the same. Anyway a wrong BRG setting wouldn't hang this loop
>=20
> So I have a few questions.
> If someone has done sbc8260 dts tree and port to "powerpc" already, I'd b=
e very  grateful if he can share it with me.
> I couldn't find anything on the internet.
>=20
> Can someone, also, explain, how "fsl, cpm-command" field works,  booting-=
without-of document doesn't provide much information.
> I feel, that just copying this value from ep8248.dts isn't right somehow.
>=20
> Thank you
>=20
>=20
>       ___________________________________________________________________=
_________________
> Be a better friend, newshound, and=20
> know-it-all with Yahoo! Mobile.  Try it now.  http://mobile.yahoo.com/;_y=
lt=3DAhu06i62sR8HDtDypao8Wcj9tAcJ
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev
--=20
Dipl.-Ing. Sergej Stepanov=20
Software-Entwicklung

IDS GmbH=20
E-PA  (Entwicklung - Prozess Automatisierung)
Nobelstr. 18,=20
D-76275 Ettlingen=20
T. (0) 72 43/2 18-615=20
F. (0) 72 43/2 18-100=20
E. Sergej.Stepanov@ids.de

<http://www.ids.de>
Gesch=C3=A4ftsf=C3=BChrer: Norbert Wagner, Friedrich Abri=C3=9F=20
Sitz der Gesellschaft: Ettlingen=20
Amtsgericht Mannheim HRB 362503=20

Re: powerpc port for sbc8260-based board problem

[Scott Wood]

On Wed, May 07, 2008 at 01:31:52AM -0700, Boris Shteinbock wrote:
>      /* Monitor port/SMC1 */
>      smc1: serial@11a80 {
>        device_type = "serial";
>        compatible = "fsl,mpc8260-smc-uart",
>                     "fsl,cpm2-smc-uart";
>        reg = <0x11a80 0x20 0x1100 0x40>;

The second reg resource depends on where your firmware set up the SMC pram
regs.  With U-boot, it's usually zero.

Note that as of 2.6.26-rc1, this is set up dynamically instead, and the
second resource should be 0x87fc 2.

> Can someone, also, explain, how "fsl, cpm-command" field works,

It's the device-specific portion of the value that gets written to the CPM
command register (page, sub-block, and mcc channel).

> booting-without-of document doesn't provide much information. I feel, that
> just copying this value from ep8248.dts isn't right somehow.

It should be the same.

-Scott

Re: powerpc port for sbc8260-based board problem

[Sergej Stepanov]

Hello Scott

Am Mittwoch, den 07.05.2008, 13:22 -0500 schrieb Scott Wood:
> On Wed, May 07, 2008 at 01:31:52AM -0700, Boris Shteinbock wrote:
> >      /* Monitor port/SMC1 */
> >      smc1: serial@11a80 {
> >        device_type =3D "serial";
> >        compatible =3D "fsl,mpc8260-smc-uart",
> >                     "fsl,cpm2-smc-uart";
> >        reg =3D <0x11a80 0x20 0x1100 0x40>;
>=20
> The second reg resource depends on where your firmware set up the SMC pra=
m
> regs.  With U-boot, it's usually zero.
>=20
> Note that as of 2.6.26-rc1, this is set up dynamically instead, and the
> second resource should be 0x87fc 2.
>=20
You are right with 0x87fc. It is one more point.
Also if your brg clock-frequency-property was correctly fixed from
u-boot.

My story is follow: we have mpc8247 based card.
The problem with smc happens due to the cpm reset.
Of course, if you have not CONFIG_PPC_EARLY_DEBUG_CPM with
CONFIG_PPC_CPM_NEW_BINDING.
May be it is some kind of mistake, but i could fix the problem with the
patch i told above.
Could give me some your note, please? Thank you.

Regards
Sergej.


--=20
Dipl.-Ing. Sergej Stepanov=20
Software-Entwicklung

IDS GmbH=20
E-PA  (Entwicklung - Prozess Automatisierung)
Nobelstr. 18,=20
D-76275 Ettlingen=20
T. (0) 72 43/2 18-615=20
F. (0) 72 43/2 18-100=20
E. Sergej.Stepanov@ids.de

<http://www.ids.de>
Gesch=C3=A4ftsf=C3=BChrer: Norbert Wagner, Friedrich Abri=C3=9F=20
Sitz der Gesellschaft: Ettlingen=20
Amtsgericht Mannheim HRB 362503=20

Re: powerpc port for sbc8260-based board problem

[Boris Shteinbock]

On Wed, May 07, 2008 at 01:31:52AM -0700, Boris Shteinbock wrote:
>      /* Monitor port/SMC1 */
>      smc1: serial@11a80 {
>        device_type = "serial";
>        compatible = "fsl,mpc8260-smc-uart",
>                     "fsl,cpm2-smc-uart";
>        reg = <0x11a80 0x20 0x1100 0x40>;

>The second reg resource depends on where your firmware set up the SMC pram
>regs.  With U-boot, it's usually zero.

>Note that as of 2.6.26-rc1, this is set up dynamically instead, and the
>second resource should be .
Is this correct?

        reg = <0x11a80 0x20 0x87fc 2>;

I also understand, that latest development kernel contains some significant changes in SMC UART code, especially
in muram code, is this correct? So does this reg value reflect this change?

>> Can someone, also, explain, how "fsl, cpm-command" field works,

>It's the device-specific portion of the value that gets written to the CPM
>command register (page, sub-block, and mcc channel).

Is it possible to get a quick list of all values for all 8260 soc devices somewhere ? Or do I have to dig  specific Freescale reference for it?
I am particularly interested in SMC2 and FCC1,2 and 3 ?


Thank you very much



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Re: powerpc port for sbc8260-based board problem

[Scott Wood]

Boris Shteinbock wrote:
>> The second reg resource depends on where your firmware set up the SMC pram
>> regs.  With U-boot, it's usually zero.
> 
>> Note that as of 2.6.26-rc1, this is set up dynamically instead, and the
>> second resource should be .
> Is this correct?
> 
>         reg = <0x11a80 0x20 0x87fc 2>;

Yes.

> I also understand, that latest development kernel contains some significant changes in SMC UART code, especially
> in muram code, is this correct? So does this reg value reflect this change?

Yes, those are the changes I was referring to.

>>> Can someone, also, explain, how "fsl, cpm-command" field works,
> 
>> It's the device-specific portion of the value that gets written to the CPM
>> command register (page, sub-block, and mcc channel).
> 
> Is it possible to get a quick list of all values for all 8260 soc devices somewhere ? Or do I have to dig  specific Freescale reference for it?

See table 13-6 (CP Command Register Field Descriptions) in the 8260 manual.

> I am particularly interested in SMC2 and FCC1,2 and 3 ?

SMC2: 0x21200000
FCC1: 0x12000000 (ATM 0x11c00280)
FCC2: 0x16200000 (ATM 0x15c00280)
FCC3: 0x1a400000

For FCCs, add 0x300 for Ethernet, 0x3c0 for transparent.

-Scott

Re: powerpc port for sbc8260-based board problem

[Scott Wood]

Sergej Stepanov wrote:
> My story is follow: we have mpc8247 based card.
> The problem with smc happens due to the cpm reset.
> Of course, if you have not CONFIG_PPC_EARLY_DEBUG_CPM with
> CONFIG_PPC_CPM_NEW_BINDING.
> May be it is some kind of mistake, but i could fix the problem with the
> patch i told above.
> Could give me some your note, please? Thank you.

I'm not sure how it would make a difference -- the BRG should have 
already been set through the set_termios callback, which is called from 
uart_set_options.

-Scott

Re: powerpc port for sbc8260-based board problem

[Sergej Stepanov]

Am Mittwoch, den 07.05.2008, 13:57 -0500 schrieb Scott Wood:
> Sergej Stepanov wrote:
> > My story is follow: we have mpc8247 based card.
> > The problem with smc happens due to the cpm reset.
> > Of course, if you have not CONFIG_PPC_EARLY_DEBUG_CPM with
> > CONFIG_PPC_CPM_NEW_BINDING.
> > May be it is some kind of mistake, but i could fix the problem with the
> > patch i told above.
> > Could give me some your note, please? Thank you.
> 
> I'm not sure how it would make a difference -- the BRG should have 
> already been set through the set_termios callback, which is called from 
> uart_set_options.
> 
> -Scott
Yes, i thought it also, but i traced it for us for the uart console.
The cpm_uart_set_termios(..) was not called.
At which place should it be called?
Is it uart_set_options(..)?

Sergej.

Re: powerpc port for sbc8260-based board problem

[Scott Wood]

Sergej Stepanov wrote:
> Am Mittwoch, den 07.05.2008, 13:57 -0500 schrieb Scott Wood:
>> I'm not sure how it would make a difference -- the BRG should have 
>> already been set through the set_termios callback, which is called from 
>> uart_set_options.
>>
>> -Scott
> Yes, i thought it also, but i traced it for us for the uart console.
> The cpm_uart_set_termios(..) was not called.
> At which place should it be called?
> Is it uart_set_options(..)?

Yes, uart_set_options() calls port->ops->set_termios().

-Scott

Re: powerpc port for sbc8260-based board problem

[Sergej Stepanov]

Am Mittwoch, den 07.05.2008, 14:34 -0500 schrieb Scott Wood:
> Sergej Stepanov wrote:
> > Am Mittwoch, den 07.05.2008, 13:57 -0500 schrieb Scott Wood:
> >> I'm not sure how it would make a difference -- the BRG should have 
> >> already been set through the set_termios callback, which is called from 
> >> uart_set_options.
> >>
> >> -Scott
> > Yes, i thought it also, but i traced it for us for the uart console.
> > The cpm_uart_set_termios(..) was not called.
> > At which place should it be called?
> > Is it uart_set_options(..)?
> 
> Yes, uart_set_options() calls port->ops->set_termios().
> 
> -Scott

Hm... it looks like the default uart_set_termios from

static const struct tty_operations uart_ops in serial_core.c

and not cpm_uart_set_termios(..)?..

Is not it? but why?...

Ok, i have to look at my code again...
Regards.

Re: powerpc port for sbc8260-based board problem

[Scott Wood]

Sergej Stepanov wrote:
> Hm... it looks like the default uart_set_termios from
> 
> static const struct tty_operations uart_ops in serial_core.c
> 
> and not cpm_uart_set_termios(..)?..
> 
> Is not it? but why?...

tty_operations != uart_ops

-Scott

Re: powerpc port for sbc8260-based board problem

[Scott Wood]

Scott Wood wrote:
> Sergej Stepanov wrote:
>> Hm... it looks like the default uart_set_termios from
>>
>> static const struct tty_operations uart_ops in serial_core.c
>>
>> and not cpm_uart_set_termios(..)?..
>>
>> Is not it? but why?...
> 
> tty_operations != uart_ops

Despite the unfortunate name of the instance of the former.

-Scott

Re: powerpc port for sbc8260-based board problem

[Sergej Stepanov]

Am Mittwoch, den 07.05.2008, 14:44 -0500 schrieb Scott Wood:
> Scott Wood wrote:
> > Sergej Stepanov wrote:
> >> Hm... it looks like the default uart_set_termios from
> >>
> >> static const struct tty_operations uart_ops in serial_core.c
> >>
> >> and not cpm_uart_set_termios(..)?..
> >>
> >> Is not it? but why?...
> > 
> > tty_operations != uart_ops
> 
> Despite the unfortunate name of the instance of the former.
> 
> -Scott

Of course :)