Commit 5026dafa authored by Chris Metcalf's avatar Chris Metcalf
Browse files

tile PCI RC: support PCIe TRIO 0 MAC 0 on Gx72 system 



On Tilera Gx72 systems, the logic for figuring out whether
a given port is root complex is slightly different.

Signed-off-by: default avatarChris Metcalf <cmetcalf@tilera.com>
parent 02b67e09

arch/tile/include/hv/drv_trio_intf.h

+3 −0
Original line number Diff line number Diff line
@@ -168,6 +168,9 @@ pcie_stream_intr_config_sel_t; 
struct pcie_trio_ports_property

{

  struct pcie_port_property ports[TILEGX_TRIO_PCIES];



  /** Set if this TRIO belongs to a Gx72 device. */

  uint8_t is_gx72;

};



/* Flags indicating traffic class. */

arch/tile/kernel/pci_gx.c

+30 −3
Original line number Diff line number Diff line
@@ -436,9 +436,26 @@ int __init tile_pci_init(void) 


	/*

	 * Now determine which PCIe ports are configured to operate in RC

	 * mode.  To use a port, it must be allowed to be in RC mode by the

	 * mode. There is a differece in the port configuration capability

	 * between the Gx36 and Gx72 devices.

	 *

	 * The Gx36 has configuration capability for each of the 3 PCIe

	 * interfaces (disable, auto endpoint, auto RC, etc.).

	 * On the Gx72, you can only select one of the 3 PCIe interfaces per

	 * TRIO to train automatically. Further, the allowable training modes

	 * are reduced to four options (auto endpoint, auto RC, stream x1,

	 * stream x4).

	 *

	 * For Gx36 ports, it must be allowed to be in RC mode by the

	 * Board Information Block, and the hardware strapping pins must be

	 * set to RC mode.

	 *

	 * For Gx72 ports, the port will operate in RC mode if either of the

	 * following is true:

	 * 1. It is allowed to be in RC mode by the Board Information Block,

	 *    and the BIB doesn't allow the EP mode.

	 * 2. It is allowed to be in either the RC or the EP mode by the BIB,

	 *    and the hardware strapping pin is set to RC mode.

	 */

	for (i = 0; i < TILEGX_NUM_TRIO; i++) {

		gxio_trio_context_t *context = &trio_contexts[i];
@@ -447,8 +464,18 @@ int __init tile_pci_init(void) 
			continue;



		for (j = 0; j < TILEGX_TRIO_PCIES; j++) {

			if (pcie_ports[i].ports[j].allow_rc &&

			int is_rc = 0;



			if (pcie_ports[i].is_gx72 &&

			    pcie_ports[i].ports[j].allow_rc) {

				if (!pcie_ports[i].ports[j].allow_ep ||

				    strapped_for_rc(context, j))

					is_rc = 1;

			} else if (pcie_ports[i].ports[j].allow_rc &&

				   strapped_for_rc(context, j)) {

				is_rc = 1;

			}

			if (is_rc) {

				pcie_rc[i][j] = 1;

				num_rc_controllers++;

			}