Synopsis SATA AHCI support

Synopsis SATA AHCI support

[Sagar Borikar]

Hi

Can you let me know whether Synopsis SATA AHCI is already supported in
2.6? and if yes then please point me to the sources.

Thanks
Sagar

Re: Synopsis SATA AHCI support

[Tejun Heo]

Sagar Borikar wrote:
> Hi
> 
> Can you let me know whether Synopsis SATA AHCI is already supported in
> 2.6? and if yes then please point me to the sources.

I don't have any experience with the synopsis one but if it's standard
ahci, the ahci driver should work but sometimes controllers require
certain quirks to work properly.  Why don't you give it a try and
report how it works?

Thanks.

-- 
tejun

Re: Synopsis SATA AHCI support

[Sagar Borikar]

Hi Tejun

Its not PCI interface but AHB. This SATA IP is intergated and
connected to AXI through AHB bridge. And as the ARM core based board
is in development stage, I haven't added all SATA functionalities. I
am debugging based on the serial output

Thanks
Sagar

On Thu, Feb 19, 2009 at 7:13 PM, Tejun Heo <tj@kernel.org> wrote:
> Hello,
>
> Sagar Borikar wrote:
>> Tejun,
>> Synospsis device is a standard one. What I am unable to understand is
>> the SATA driver soruces for that. Or may be I am missing something. I
>> have enabled ahci in my platform but it's not getting detected
>
> Please keep linux-ide cc'd.  Hmmm... if you have ahci enabled, it
> should work if the device is advertising standard ahci interface via
> its pci class code.  Can you post the output of "lspci -nn" and the
> boot log?
>
> Thanks.
>
> --
> tejun
>

Re: Synopsis SATA AHCI support

[Tejun Heo]

Sagar Borikar wrote:
> Hi Tejun
> 
> Its not PCI interface but AHB. This SATA IP is intergated and
> connected to AXI through AHB bridge. And as the ARM core based board
> is in development stage, I haven't added all SATA functionalities. I
> am debugging based on the serial output

Dunno anything about AHB or AXI but it's not a PCI device at all?
Then, how is the ahci driver supposed to find it?  Currently, libata
ahci driver only supports pci devices.  You'll at least need to modify
the init function to get the controller recognized by the driver.

-- 
tejun

Re: Synopsis SATA AHCI support

[Sagar Borikar]

Tejun,

The interface block is like this:

AHB to AXI Bridge
-------------------------------------------------------------------------------------------------------------

----------------------------------
----------------------------------------------
|         AHB Slave        |                           |         AHB
Master (DMA)        |
---------------------------------
----------------------------------------------


----------------------------------
----------------------------------------------
|         AHCI registers    |                           |
DMAC                        |
-----------------------------------
-----------------------------------------------


I need to convert PCI interface to AHB. Has anyone done that before?

Thanks
Sagar


On Fri, Feb 20, 2009 at 6:06 AM, Tejun Heo <tj@kernel.org> wrote:
> Sagar Borikar wrote:
>> Hi Tejun
>>
>> Its not PCI interface but AHB. This SATA IP is intergated and
>> connected to AXI through AHB bridge. And as the ARM core based board
>> is in development stage, I haven't added all SATA functionalities. I
>> am debugging based on the serial output
>
> Dunno anything about AHB or AXI but it's not a PCI device at all?
> Then, how is the ahci driver supposed to find it?  Currently, libata
> ahci driver only supports pci devices.  You'll at least need to modify
> the init function to get the controller recognized by the driver.
>
> --
> tejun
>