Documentation: PCI: Add specification for the *PCI test* function device

Add specification for the *PCI test* virtual function device. The endpoint
function driver and the host PCI driver should be created based on this
specification.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/Documentation/PCI/00-INDEX b/Documentation/PCI/00-INDEX
index bf8223a1bf088465c9772155654895a940dcfe64..ab35e4bbdb1cfa578f01a7b47b1ec36edac116e3 100644 (file)
--- a/Documentation/PCI/00-INDEX
+++ b/Documentation/PCI/00-INDEX
@@ -16,3 +16,5 @@ endpoint/pci-endpoint.txt
        - guide to add endpoint controller driver and endpoint function driver.
 endpoint/pci-endpoint-cfs.txt
        - guide to use configfs to configure the PCI endpoint function.
+endpoint/pci-test-function.txt
+       - specification of *PCI test* function device.

diff --git a/Documentation/PCI/endpoint/pci-test-function.txt b/Documentation/PCI/endpoint/pci-test-function.txt
new file mode 100644 (file)
index 0000000..0c519c9
--- /dev/null
+++ b/Documentation/PCI/endpoint/pci-test-function.txt
@@ -0,0 +1,66 @@
+                               PCI TEST
+                   Kishon Vijay Abraham I <kishon@ti.com>
+
+Traditionally PCI RC has always been validated by using standard
+PCI cards like ethernet PCI cards or USB PCI cards or SATA PCI cards.
+However with the addition of EP-core in linux kernel, it is possible
+to configure a PCI controller that can operate in EP mode to work as
+a test device.
+
+The PCI endpoint test device is a virtual device (defined in software)
+used to test the endpoint functionality and serve as a sample driver
+for other PCI endpoint devices (to use the EP framework).
+
+The PCI endpoint test device has the following registers:
+
+       1) PCI_ENDPOINT_TEST_MAGIC
+       2) PCI_ENDPOINT_TEST_COMMAND
+       3) PCI_ENDPOINT_TEST_STATUS
+       4) PCI_ENDPOINT_TEST_SRC_ADDR
+       5) PCI_ENDPOINT_TEST_DST_ADDR
+       6) PCI_ENDPOINT_TEST_SIZE
+       7) PCI_ENDPOINT_TEST_CHECKSUM
+
+*) PCI_ENDPOINT_TEST_MAGIC
+
+This register will be used to test BAR0. A known pattern will be written
+and read back from MAGIC register to verify BAR0.
+
+*) PCI_ENDPOINT_TEST_COMMAND:
+
+This register will be used by the host driver to indicate the function
+that the endpoint device must perform.
+
+Bitfield Description:
+  Bit 0                : raise legacy IRQ
+  Bit 1                : raise MSI IRQ
+  Bit 2 - 7    : MSI interrupt number
+  Bit 8                : read command (read data from RC buffer)
+  Bit 9                : write command (write data to RC buffer)
+  Bit 10       : copy command (copy data from one RC buffer to another
+                 RC buffer)
+
+*) PCI_ENDPOINT_TEST_STATUS
+
+This register reflects the status of the PCI endpoint device.
+
+Bitfield Description:
+  Bit 0                : read success
+  Bit 1                : read fail
+  Bit 2                : write success
+  Bit 3                : write fail
+  Bit 4                : copy success
+  Bit 5                : copy fail
+  Bit 6                : IRQ raised
+  Bit 7                : source address is invalid
+  Bit 8                : destination address is invalid
+
+*) PCI_ENDPOINT_TEST_SRC_ADDR
+
+This register contains the source address (RC buffer address) for the
+COPY/READ command.
+
+*) PCI_ENDPOINT_TEST_DST_ADDR
+
+This register contains the destination address (RC buffer address) for
+the COPY/WRITE command.