9.4. PCI Test Function

Author: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
  8. PCI_ENDPOINT_TEST_IRQ_TYPE
  9. PCI_ENDPOINT_TEST_IRQ_NUMBER
  • 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 raise MSI-X IRQ
Bit 3 read command (read data from RC buffer)
Bit 4 write command (write data to RC buffer)
Bit 5 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.

  • PCI_ENDPOINT_TEST_IRQ_TYPE

This register contains the interrupt type (Legacy/MSI) triggered for the READ/WRITE/COPY and raise IRQ (Legacy/MSI) commands.

Possible types:

Legacy 0
MSI 1
MSI-X 2
  • PCI_ENDPOINT_TEST_IRQ_NUMBER

This register contains the triggered ID interrupt.

Admissible values:

Legacy 0
MSI [1 .. 32]
MSI-X [1 .. 2048]