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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: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf 2013-08-05 14:27:05 -04:00
parent 02b67e0954
commit 5026dafa17
2 changed files with 33 additions and 3 deletions
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3
arch/tile/include/hv/drv_trio_intf.h
View File

@ -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. */

33
arch/tile/kernel/pci_gx.c
View File

@ -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 &&
strapped_for_rc(context, j)) {
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++;
}