xref: /openbmc/linux/Documentation/ABI/testing/configfs-spear-pcie-gadget (revision 34433332)

What:		/config/pcie-gadget
Date:		Feb 2011
KernelVersion:	2.6.37
Contact:	Pratyush Anand <pratyush.anand@gmail.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/

	For nth PCIe Device Controller /config/pcie-gadget.n/:

	=============== ======================================================
	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.
	=============== ======================================================