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static int enumerate_ht_chain(unsigned link)
{
/* Assumption the HT chain that is bus 0 has the HT I/O Hub on it.
* On most boards this just happens. If a cpu has multiple
* non Coherent links the appropriate bus registers for the
* links needs to be programed to point at bus 0.
*/
unsigned next_unitid, last_unitid;
int reset_needed = 0;
next_unitid = 1;
do {
uint32_t id;
uint8_t hdr_type, pos;
last_unitid = next_unitid;
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)) {
break;
}
hdr_type = pci_read_config8(PCI_DEV(0,0,0), PCI_HEADER_TYPE);
pos = 0;
hdr_type &= 0x7f;
if ((hdr_type == PCI_HEADER_TYPE_NORMAL) ||
(hdr_type == PCI_HEADER_TYPE_BRIDGE)) {
pos = pci_read_config8(PCI_DEV(0,0,0), PCI_CAPABILITY_LIST);
}
while(pos != 0) {
uint8_t cap;
cap = pci_read_config8(PCI_DEV(0,0,0), pos + PCI_CAP_LIST_ID);
if (cap == PCI_CAP_ID_HT) {
uint16_t flags;
flags = pci_read_config16(PCI_DEV(0,0,0), pos + PCI_CAP_FLAGS);
if ((flags >> 13) == 0) {
unsigned count;
flags &= ~0x1f;
flags |= next_unitid & 0x1f;
count = (flags >> 5) & 0x1f;
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));
return reset_needed;
}
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