diff options
Diffstat (limited to 'src/northbridge/amd/amdk8/early_ht.c')
| -rw-r--r-- | src/northbridge/amd/amdk8/early_ht.c | 31 |
1 files changed, 24 insertions, 7 deletions
diff --git a/src/northbridge/amd/amdk8/early_ht.c b/src/northbridge/amd/amdk8/early_ht.c index ab9d4592dd..2711657455 100644 --- a/src/northbridge/amd/amdk8/early_ht.c +++ b/src/northbridge/amd/amdk8/early_ht.c @@ -17,8 +17,9 @@ static int enumerate_ht_chain(void) id = pci_read_config32(PCI_DEV(0,0,0), PCI_VENDOR_ID); /* If the chain is enumerated quit */ if (((id & 0xffff) == 0x0000) || ((id & 0xffff) == 0xffff) || - (((id >> 16) & 0xffff) == 0xffff) || - (((id >> 16) & 0xffff) == 0x0000)) { + (((id >> 16) & 0xffff) == 0xffff) || + (((id >> 16) & 0xffff) == 0x0000)) + { break; } @@ -35,7 +36,8 @@ static int enumerate_ht_chain(void) hdr_type &= 0x7f; if ((hdr_type == PCI_HEADER_TYPE_NORMAL) || - (hdr_type == PCI_HEADER_TYPE_BRIDGE)) { + (hdr_type == PCI_HEADER_TYPE_BRIDGE)) + { pos = pci_read_config8(PCI_DEV(0,0,0), PCI_CAPABILITY_LIST); } while(pos != 0) { @@ -43,24 +45,39 @@ static int enumerate_ht_chain(void) cap = pci_read_config8(PCI_DEV(0,0,0), pos + PCI_CAP_LIST_ID); if (cap == PCI_CAP_ID_HT) { uint16_t flags; + /* Read and write and reread flags so the link + * direction bit is valid. + */ + flags = pci_read_config16(PCI_DEV(0,0,0), pos + PCI_CAP_FLAGS); + pci_write_config16(PCI_DEV(0,0,0), pos + PCI_CAP_FLAGS, flags); flags = pci_read_config16(PCI_DEV(0,0,0), pos + PCI_CAP_FLAGS); if ((flags >> 13) == 0) { unsigned count; + unsigned ctrl, ctrl_off; flags &= ~0x1f; flags |= next_unitid & 0x1f; count = (flags >> 5) & 0x1f; + next_unitid += count; + + /* Test for end of chain */ + ctrl_off = ((flags >> 10) & 1)? + PCI_HT_CAP_SLAVE_CTRL1 : PCI_HT_CAP_SLAVE_CTRL0; + ctrl = pci_read_config16(PCI_DEV(0,0,0), pos + ctrl_off); + /* Is this the end of the hypertransport chain. + * or has the link failed? + */ + if (ctrl & ((1 << 6)|(1 << 4))) { + next_unitid = 0x20; + } pci_write_config16(PCI_DEV(0, 0, 0), pos + PCI_CAP_FLAGS, flags); - - next_unitid += count; break; } } pos = pci_read_config8(PCI_DEV(0, 0, 0), pos + PCI_CAP_LIST_NEXT); } - } while((last_unitid != next_unitid) && (next_unitid <= 0x1f)); - + } while((last_unitid != next_unitid) && (next_unitid <= 0x1f)); return reset_needed; } |