ST SPEAr: PCIE gadget suppport

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, the gadget is configured for INTX and SYSRAM1 is mapped to
BAR0 with size 0x1000

Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Viresh Kumar <viresh.kumar@st.com>
Cc: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/configfs-spear-pcie-gadget b/Documentation/ABI/testing/configfs-spear-pcie-gadget
new file mode 100644
index 000000000000..875988146a63
--- /dev/null
+++ b/Documentation/ABI/testing/configfs-spear-pcie-gadget
@@ -0,0 +1,31 @@
+What:           /config/pcie-gadget
+Date:           Feb 2011
+KernelVersion:  2.6.37
+Contact:        Pratyush Anand <pratyush.anand@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/
+
+        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.