Marvel PMP SATA controller

Marvel PMP SATA controller

[Richard]

Morning all,

Using the Marvel Port Multiplier I am stuck trying to get it working 
with some Hard drives.. I am stuck trying to figure out how to write the 
command to the SCR register on the device as there seems to be multiple 
methods used in the code I dont understand.

the procedure I need to follow is - Init_SATA, classify_device, if 
(special PMP) set mode to SATA-GEN1, then only can it continue.

using a ata_taskfile this early in the init causes a major explosion so 
my next option is to use writel/b() to the SCR registers..  this is the 
piece I dont understand is how the bytes are structured in the writel 
command.  I need to write 0xe80211 (Write value 0x11 to position 2) to 
force the chip to go in to Gen1 mode so that it can work with some older 
Maxtor Hard drives

Is there any HOWTO on the structure of the commands (target,port,c,h,s 
etc etc)

Thanks in Advance
Richard

Re: Marvel PMP SATA controller

[Mark Lord]

On 10-09-29 02:56 AM, Richard wrote:
> Morning all,
>
> Using the Marvel Port Multiplier I am stuck trying to get it working with some Hard drives.


Err.. just plug some drives into it, and then plug it (the PMP) into
a SATA controller that supports PMP (eg. the Marvell ones, newer AHCI, some Sil ones, etc..).

What are you trying to do?

Re: Marvel PMP SATA controller

[Richard]

On 29/09/10 20:56, Mark Lord wrote:
> On 10-09-29 02:56 AM, Richard wrote:
>> Morning all,
>>
>> Using the Marvel Port Multiplier I am stuck trying to get it working 
>> with some Hard drives.
>
>
> Err.. just plug some drives into it, and then plug it (the PMP) into
> a SATA controller that supports PMP (eg. the Marvell ones, newer AHCI, 
> some Sil ones, etc..).
>
> What are you trying to do?
Hi Mark,

Its an embedded device whereby the one HDD I have does not work with the 
Marvel PMP. I have the command to send to the PMP controller but I am 
not an officianado with linux SATA(the code I have is from VxWorks) The 
drive is confirmed working, but the PMP chip does not default to SATA 
Generation 1, and this HDD is a bit dumb to figure it out :) - so I have 
to force the PMP controller to Gen1 mode.
(I have tons of drives that work just fine, its just this ONE Maxtor 
drive that is being a pain)

The short - I need to write a command to the SATA controller before this 
HDD can be recognised.

Much appreciated,
Richard

Re: Marvel PMP SATA controller

[Mark Lord]

On 10-09-29 04:32 PM, Richard wrote:
> On 29/09/10 20:56, Mark Lord wrote:

>> What are you trying to do?
> Hi Mark,
>
> Its an embedded device whereby the one HDD I have does not work with the Marvel PMP. I have the command to send to the PMP controller but I am not an officianado with linux SATA(the code I have is from VxWorks) The drive is confirmed working, but the PMP chip does not default to SATA Generation 1, and this HDD is a bit dumb to figure it out :) - so I have to force the PMP controller to Gen1 mode.
> (I have tons of drives that work just fine, its just this ONE Maxtor drive that is being a pain)
>
> The short - I need to write a command to the SATA controller before this HDD can be recognised.
..

Does the existing libata parameter take care of it for you?

linux/Documentation/kernel-parameters.txt:
eg.  libata.force=[ID:]1.5"   ## replace [ID:] with port[.device] for the PMP and/or HD

Re: Marvel PMP SATA controller

[Richard]

On 30/09/10 14:39, Mark Lord wrote:
> On 10-09-29 04:32 PM, Richard wrote:
>> On 29/09/10 20:56, Mark Lord wrote:
>
>>> What are you trying to do?
>> Hi Mark,
>>
>> Its an embedded device whereby the one HDD I have does not work with 
>> the Marvel PMP. I have the command to send to the PMP controller but 
>> I am not an officianado with linux SATA(the code I have is from 
>> VxWorks) The drive is confirmed working, but the PMP chip does not 
>> default to SATA Generation 1, and this HDD is a bit dumb to figure it 
>> out :) - so I have to force the PMP controller to Gen1 mode.
>> (I have tons of drives that work just fine, its just this ONE Maxtor 
>> drive that is being a pain)
>>
>> The short - I need to write a command to the SATA controller before 
>> this HDD can be recognised.
> ..
>
> Does the existing libata parameter take care of it for you?
>
> linux/Documentation/kernel-parameters.txt:
> eg.  libata.force=[ID:]1.5"   ## replace [ID:] with port[.device] for 
> the PMP and/or HD
>
Unfortunately not.. which is why I asked how to write commands directly 
on to the SATA bus from kernel space.

Richard

Re: Marvel PMP SATA controller

[Robert Hancock]

On 09/30/2010 08:03 AM, Richard wrote:
> On 30/09/10 14:39, Mark Lord wrote:
>> On 10-09-29 04:32 PM, Richard wrote:
>>> On 29/09/10 20:56, Mark Lord wrote:
>>
>>>> What are you trying to do?
>>> Hi Mark,
>>>
>>> Its an embedded device whereby the one HDD I have does not work with
>>> the Marvel PMP. I have the command to send to the PMP controller but
>>> I am not an officianado with linux SATA(the code I have is from
>>> VxWorks) The drive is confirmed working, but the PMP chip does not
>>> default to SATA Generation 1, and this HDD is a bit dumb to figure it
>>> out :) - so I have to force the PMP controller to Gen1 mode.
>>> (I have tons of drives that work just fine, its just this ONE Maxtor
>>> drive that is being a pain)
>>>
>>> The short - I need to write a command to the SATA controller before
>>> this HDD can be recognised.
>> ..
>>
>> Does the existing libata parameter take care of it for you?
>>
>> linux/Documentation/kernel-parameters.txt:
>> eg. libata.force=[ID:]1.5" ## replace [ID:] with port[.device] for the
>> PMP and/or HD
>>
> Unfortunately not.. which is why I asked how to write commands directly
> on to the SATA bus from kernel space.

Looking at the code it seems like it should.. what kernel version are 
you using? See sata_set_spd in libata-core.c, which calls 
sata_scr_write, which calls sata_pmp_scr_write if it's not a host link..

Re: Marvel PMP SATA controller

[Richard]

On 01/10/10 01:24, Robert Hancock wrote:
> On 09/30/2010 08:03 AM, Richard wrote:
>> On 30/09/10 14:39, Mark Lord wrote:
>>> On 10-09-29 04:32 PM, Richard wrote:
>>>> On 29/09/10 20:56, Mark Lord wrote:
>>>
>>>>> What are you trying to do?
>>>> Hi Mark,
>>>>
>>>> Its an embedded device whereby the one HDD I have does not work with
>>>> the Marvel PMP. I have the command to send to the PMP controller but
>>>> I am not an officianado with linux SATA(the code I have is from
>>>> VxWorks) The drive is confirmed working, but the PMP chip does not
>>>> default to SATA Generation 1, and this HDD is a bit dumb to figure it
>>>> out :) - so I have to force the PMP controller to Gen1 mode.
>>>> (I have tons of drives that work just fine, its just this ONE Maxtor
>>>> drive that is being a pain)
>>>>
>>>> The short - I need to write a command to the SATA controller before
>>>> this HDD can be recognised.
>>> ..
>>>
>>> Does the existing libata parameter take care of it for you?
>>>
>>> linux/Documentation/kernel-parameters.txt:
>>> eg. libata.force=[ID:]1.5" ## replace [ID:] with port[.device] for the
>>> PMP and/or HD
>>>
>> Unfortunately not.. which is why I asked how to write commands directly
>> on to the SATA bus from kernel space.
>
> Looking at the code it seems like it should.. what kernel version are 
> you using? See sata_set_spd in libata-core.c, which calls 
> sata_scr_write, which calls sata_pmp_scr_write if it's not a host link..
Its a bit more than 'Put it in to 1.5Gbps speed' - Even when selecting 
this speed nothing happens. When I write to the PMP controller using a 
Finisar SATA analyser (Write 0xE8 Register 0x02 Value 0x11) which 
according to the Marvel specifications is 'Set to SATA Generation 1 and 
Reset Drive' things start to happen.  Unfortunately the kernel is a 
2.6.18 one and there is no hope of updating it in the short term as its 
used across many projects.

Richard

Re: Marvel PMP SATA controller

[Mark Lord]

On 10-09-30 10:03 AM, Richard wrote:
> On 30/09/10 14:39, Mark Lord wrote:
..
>> Does the existing libata parameter take care of it for you?
>>
>> linux/Documentation/kernel-parameters.txt:
>> eg. libata.force=[ID:]1.5" ## replace [ID:] with port[.device] for the PMP and/or HD
>>
> Unfortunately not.. which is why I asked how to write commands directly on to the SATA bus from kernel space.


Right.  Well, just keep plunking away at it in that ancient kernel, then.
The two modern routines to study/backport are sata_pmp_read() and sata_pmp_write(),
which are used by most controllers to perform PMP register accesses.

However, the host controller may require additional tweaks,
especially if it is a Marvell host controller (sata_mv),
or something that doesn't normally "do" PMP, like ata_piix.

Cheers