[U-Boot] I2C Register

[U-Boot] I2C Register

[Ronny D]

Hi,
?
I am trying to read SPD data from dimm though I2c.
as the board that i am using it has different I2c register so it is difficult to match with the register used in u-boot.
Can i get the information about 
/*-----------------------------------------------------------------------------
| IIC Register Offsets
'----------------------------------------------------------------------------*/
#define IICMDBUF??0x00
#define IICSDBUF??0x02
#define IICLMADR??0x04
#define IICHMADR??0x05
#define IICCNTL???0x06
#define IICMDCNTL??0x07
#define IICSTS???0x08
#define IICEXTSTS??0x09
#define IICLSADR??0x0A
#define IICHSADR??0x0B
#define IICCLKDIV??0x0C
#define IICINTRMSK??0x0D
#define IICXFRCNT??0x0E
#define IICXTCNTLSS??0x0F
#define IICDIRECTCNTL??0x10

these register to that it will be easy for me to match with the register that i am using.
?
Regards,
Ronny


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[U-Boot] I2C Register

[Stefan Roese]

Hi Ronny,

On Thursday 04 February 2010 15:30:35 Ronny D wrote:
> I am trying to read SPD data from dimm though I2c.
> as the board that i am using it has different I2c register so it is
>  difficult to match with the register used in u-boot.

Which platform are you using? PPC4xx? Or something else?

>  Can i get the
>  information about
> /*-------------------------------------------------------------------------
> ----
> 
> | IIC Register Offsets
> 
> '--------------------------------------------------------------------------
> --*/ #define IICMDBUF  0x00
> #define IICSDBUF  0x02
> #define IICLMADR  0x04
> #define IICHMADR  0x05
> #define IICCNTL   0x06
> #define IICMDCNTL  0x07
> #define IICSTS   0x08
> #define IICEXTSTS  0x09
> #define IICLSADR  0x0A
> #define IICHSADR  0x0B
> #define IICCLKDIV  0x0C
> #define IICINTRMSK  0x0D
> #define IICXFRCNT  0x0E
> #define IICXTCNTLSS  0x0F
> #define IICDIRECTCNTL  0x10
> 
> these register to that it will be easy for me to match with the register
>  that i am using. 

These defines above are not available in U-Boot any more. I switched to using 
a struct s while ago:

struct ppc4xx_i2c {
        u8 mdbuf;
        u8 res1;
        u8 sdbuf;
	...

You are using PPC4xx, right?

Cheers,
Stefan

--
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HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office at denx.de

[U-Boot] I2C Register

[Ronny D]

Hi Stefan,

I am using ppc440 for customized board.

U-boot version that i am using is u-boot-2009.11.
Here i am searching for the ppc4xx_i2c structure but not able to get it. on the other hand i have seen the i2c register macros used in i2c_transfer call.

~Ronny
 

--- On Thu, 4/2/10, Stefan Roese <sr@denx.de> wrote:

From: Stefan Roese <sr@denx.de>
Subject: Re: I2C Register
To: "Ronny D" <ronny_d37@yahoo.com>
Cc: u-boot at lists.denx.de
Date: Thursday, 4 February, 2010, 2:53 PM

Hi Ronny,

On Thursday 04 February 2010 15:30:35 Ronny D wrote:
> I am trying to read SPD data from dimm though I2c.
> as the board that i am using it has different I2c register so it is
>? difficult to match with the register used in u-boot.

Which platform are you using? PPC4xx? Or something else?

>? Can i get the
>? information about
> /*-------------------------------------------------------------------------
> ----
> 
> | IIC Register Offsets
> 
> '--------------------------------------------------------------------------
> --*/ #define IICMDBUF? 0x00
> #define IICSDBUF? 0x02
> #define IICLMADR? 0x04
> #define IICHMADR? 0x05
> #define IICCNTL???0x06
> #define IICMDCNTL? 0x07
> #define IICSTS???0x08
> #define IICEXTSTS? 0x09
> #define IICLSADR? 0x0A
> #define IICHSADR? 0x0B
> #define IICCLKDIV? 0x0C
> #define IICINTRMSK? 0x0D
> #define IICXFRCNT? 0x0E
> #define IICXTCNTLSS? 0x0F
> #define IICDIRECTCNTL? 0x10
> 
> these register to that it will be easy for me to match with the register
>? that i am using. 

These defines above are not available in U-Boot any more. I switched to using 
a struct s while ago:

struct ppc4xx_i2c {
? ? ? ? u8 mdbuf;
? ? ? ? u8 res1;
? ? ? ? u8 sdbuf;
??? ...

You are using PPC4xx, right?

Cheers,
Stefan

--
DENX Software Engineering GmbH,? ? ? MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,? Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office at denx.de



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[U-Boot] I2C Register

[Stefan Roese]

Hi Ronny,

On Friday 05 February 2010 06:43:20 Ronny D wrote:
> I am using ppc440 for customized board.

So is this a "normal" AMCC PPC4xx (e.g. 440GX...) or a custom PPC4xx chip? If 
it's a common 4xx, then the normal PPC4xx I2C code should just work for you as 
well.
 
> U-boot version that i am using is u-boot-2009.11.

That is before the restructuring. For new work please use the latest version 
from the git repository.

> Here i am searching for the ppc4xx_i2c structure but not able to get it. on
>  the other hand i have seen the i2c register macros used in i2c_transfer
>  call.

Again, 2009-11 is already outdated. I reworked the I2C stuff in the meantime. 
Try the latest version and take a look at:

  cpu/ppc4xx/i2c.c
  include/4xx_i2c.h
 

Cheers,
Stefan

--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office at denx.de

[U-Boot] I2C Register

[Ronny D]

It is not a normal AMCC PPC4xx, its a customized PPC4xx chip. so I2C code wont work for me as it is.

i will have to map my register with i2c register used by u-boot.

Now i have downloaded latest u-boot version(Jan 25 2010 12:37 Link u-boot-latest.tar.bz2 -> u-boot-2009.11.1.tar.bz2) from ftp.

still ppc4xx_i2c structure i could not found. 

~Ronny.

--- On Thu, 4/2/10, Stefan Roese <sr@denx.de> wrote:
Hi Ronny,

On Friday 05 February 2010 06:43:20 Ronny D wrote:
> I am using ppc440 for customized board.

So is this a "normal" AMCC PPC4xx (e.g. 440GX...) or a custom PPC4xx chip? If 
it's a common 4xx, then the normal PPC4xx I2C code should just work for you as 
well.
 
> U-boot version that i am using is u-boot-2009.11.

That is before the restructuring. For new work please use the latest version 
from the git repository.

> Here i am searching for the ppc4xx_i2c structure but not able to get it. on
>  the other hand i have seen the i2c register macros used in i2c_transfer
>  call.

Again, 2009-11 is already outdated. I reworked the I2C stuff in the meantime. 
Try the latest version and take a look at:

  cpu/ppc4xx/i2c.c
  include/4xx_i2c.h
 

Cheers,
Stefan

--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: off... at denx.de
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[U-Boot] I2C Register

[Stefan Roese]

On Friday 05 February 2010 07:41:27 Ronny D wrote:
> It is not a normal AMCC PPC4xx, its a customized PPC4xx chip. so I2C code
>  wont work for me as it is.

I see. So you should probably not base your I2C driver code on the PPC4xx 
code. Perhaps you could use the soft_i2c code, where you only need some GPIO's 
to control the I2C signals.
 
> i will have to map my register with i2c register used by u-boot.
> 
> Now i have downloaded latest u-boot version(Jan 25 2010 12:37 Link
>  u-boot-latest.tar.bz2 -> u-boot-2009.11.1.tar.bz2) from ftp.
> 
> still ppc4xx_i2c structure i could not found.

That's because the source code on the FTP server is reflecting the last 
release version. Please use the latest version from the git repository 
instead:

http://git.denx.de/?p=u-boot.git;a=summary

There is also the possibility to download a snapshort in this web page, if you 
can't use git for some reason.
 
Cheers,
Stefan

--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office at denx.de

[U-Boot] I2C Register

[Ronny D]

Stefan,

My Customized ppc4xx I2C interface provides two I2C controllers. so i think we will have to use Hard I2C ( because i will have to modify the same in kernel too).

Shall i used the same i2c driver from u-boot by modifying the register or write my own driver for it?

i found the ppc4xx_i2c structure, but can i get the information about the each parameter or register used in that structure.

~Ronny

--- On Fri, 5/2/10, Stefan Roese <sr@denx.de> wrote:

From: Stefan Roese <sr@denx.de>
Subject: Re: I2C Register
To: "Ronny D" <ronny_d37@yahoo.com>
Cc: u-boot at lists.denx.de
Date: Friday, 5 February, 2010, 7:24 AM

On Friday 05 February 2010 07:41:27 Ronny D wrote:
> It is not a normal AMCC PPC4xx, its a customized PPC4xx chip. so I2C code
>? wont work for me as it is.

I see. So you should probably not base your I2C driver code on the PPC4xx 
code. Perhaps you could use the soft_i2c code, where you only need some GPIO's 
to control the I2C signals.
 
> i will have to map my register with i2c register used by u-boot.
> 
> Now i have downloaded latest u-boot version(Jan 25 2010 12:37 Link
>? u-boot-latest.tar.bz2 -> u-boot-2009.11.1.tar.bz2) from ftp.
> 
> still ppc4xx_i2c structure i could not found.

That's because the source code on the FTP server is reflecting the last 
release version. Please use the latest version from the git repository 
instead:

http://git.denx.de/?p=u-boot.git;a=summary

There is also the possibility to download a snapshort in this web page, if you 
can't use git for some reason.
 
Cheers,
Stefan

--
DENX Software Engineering GmbH,? ? ? MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,? Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office at denx.de



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[U-Boot] I2C Register

[Stefan Roese]

Ronny,

On Friday 05 February 2010 09:22:59 Ronny D wrote:
> My Customized ppc4xx I2C interface provides two I2C controllers. so i think
>  we will have to use Hard I2C ( because i will have to modify the same in
>  kernel too).

Yes, this would be best. But if you can map the I2C pins via pin multiplexing 
to some GPIO pins, you could use the existing soft_i2c driver.
 
> Shall i used the same i2c driver from u-boot by modifying the register or
>  write my own driver for it?

I have no idea, since I don't have any infos about your I2C controller. I 
don't know if it is similar to any of the supported controllers. So you need 
to check this yourself.
 
> i found the ppc4xx_i2c structure, but can i get the information about the
>  each parameter or register used in that structure.

From the PPC4xx user manuals. For example the PPC440EPx. You can download 
those manual from the AppliedMicro (AMCC) web site.

Cheers,
Stefan

--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office at denx.de

[U-Boot] U-boot compilation for little endian

[Ronny D]

Hi Stefan,

I am using customized ppc440 based board. We need u-boot in little endian.
Will it possible to compile the u-boot source in little endian for ppc440?


Regards,
Ronny D? 



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[U-Boot] U-boot compilation for little endian

[Wolfgang Denk]

Dear Ronny D,

In message <143206.74847.qm@web46114.mail.sp1.yahoo.com> you wrote:
> 
> I am using customized ppc440 based board. We need u-boot in little endian.
> Will it possible to compile the u-boot source in little endian for ppc440?

The natural byte order for the Power Architecture is Big Endian. We do
not support Littel Endian mode on Power.

I have to admit that I doubt if efforts to implement LE mode on
Power make any sense - as mentioned, BE is the natural byte order, and
usually it's much easier to explicitly convert date when accessing LE
devices as we're doing for example when accessing the PCI bus.

I recommend to reconsider your plans.

Best regards,

Wolfgang Denk

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DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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