linux-kernel - Re: [PATCH V5 Resend] ST SPEAr: PCIE gadget suppport

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Date:	Thu, 3 Mar 2011 10:30:15 +0530
From:	pratyush <pratyush.anand@...com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"rdunlap@...otime.net" <rdunlap@...otime.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	Viresh KUMAR <viresh.kumar@...com>,
	Shiraz HASHIM <shiraz.hashim@...com>
Subject: Re: [PATCH V5 Resend] ST SPEAr: PCIE gadget suppport

On 2/24/2011 5:36 AM, Andrew Morton wrote:
> On Mon, 21 Feb 2011 13:50:55 +0530
> Pratyush Anand <pratyush.anand@...com> wrote:
> 
>> This is a configurable gadget. can be configured by configfs interface. Any
>> IP available at PCIE bus can be programmed to be used by host
>> controller.It supoorts both INTX and MSI.
>> By default, gadget is configured for INTX and SYSRAM1 is mapped to BAR0
>> with size 0x1000
>>
>> Changes since V4:
>> - All documentation related comments incorporated
>>
>> Changes since V3:
>> - support for multiple instances of such device
> 
> ^^ This doesn't seem to agree with the documentation.
> 

Will add a line in documentation for it.

>> ...
>>
>> --- /dev/null
>> +++ b/Documentation/ABI/testing/configfs-spear-pcie-gadget
>> @@ -0,0 +1,30 @@
>> +What:		/config/pcie-gadget
>> +Date:		Feb 2011
>> +KernelVersion:	2.6.37
>> +Contact:	Pratyush Anand <pratyush.anand@...com>
>> +Description:
>> +
>> +	Interface is used to configure selected dual mode PCIe controller
>> +	as device and then program its various registers to configure it
>> +	as a particular device type.
>> +	This interfaces can be used to show spear's PCIe device capability.
>> +
>> +	Nodes are only visible when configfs is mounted. To mount configfs
>> +	in /config directory use:
>> +	# mount -t configfs none /config/
>> +
>> +	/config/pcie-gadget/
>> +		link ... used to enable ltssm and read its status.
>> +		int_type ...used to configure and read type of supported
>> +			interrupt
>> +		no_of_msi ... used to configure number of MSI vector needed and
>> +			to read no of MSI granted.
>> +		inta ... write 1 to assert INTA and 0 to de-assert.
>> +		send_msi ... write MSI vector to be sent.
>> +		vendor_id ... used to write and read vendor id (hex)
>> +		device_id ... used to write and read device id (hex)
>> +		bar0_size ... used to write and read bar0_size
>> +		bar0_address ... used to write and read bar0 mapped area in hex.
>> +		bar0_rw_offset ... used to write and read offset of bar0 where
>> +			bar0_data will be written or read.
>> +		bar0_data ... used to write and read data at bar0_rw_offset.
> 
> What's the configfs naming scheme for the second and later devices?
> 

there would be pcie-gadget.n directory under /config for
nth PCIe Device Controller.

Regards
Pratyush

> 
> .
> 

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