[PATCH V5 Resend] ST SPEAr: PCIE gadget suppport
pratyush
pratyush.anand at st.com
Thu Mar 3 00:00:15 EST 2011
On 2/24/2011 5:36 AM, Andrew Morton wrote:
> On Mon, 21 Feb 2011 13:50:55 +0530
> Pratyush Anand <pratyush.anand at st.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 at st.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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