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- First pass at code for generic link width and size determination

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git-svn-id: svn://svn.coreboot.org/coreboot/trunk@999 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Eric Biederman
2003-07-21 23:30:29 +00:00
parent 2c018fba95
commit 860ad373ef
4 changed files with 198 additions and 33 deletions
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164
src/devices/pci_device.c
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@@ -473,7 +473,8 @@ unsigned int pci_scan_bus(struct device *bus, unsigned int max)
struct device *old_devices;
struct device *child;
#if HYPERTRANSPORT_SUPPORT
unsigned next_unitid, last_unitid;
unsigned next_unitid, last_unitid, previous_unitid;
int reset_needed;
#endif
printk_debug("PCI: pci_scan_bus for bus %d\n", bus->secondary);
@@ -486,20 +487,19 @@ unsigned int pci_scan_bus(struct device *bus, unsigned int max)
#if HYPERTRANSPORT_SUPPORT
/* If present assign unitid to a hypertransport chain */
next_unitid = 1;
do {
/* Spin through the devices and collapse any early
* hypertransport enumeration.
*/
for(devfn = 0; devfn <= 0xff; devfn += 8) {
struct device dummy;
uint32_t id;
uint8_t hdr_type, pos;
last_unitid = next_unitid;
dummy.bus = bus;
dummy.devfn = 0;
dummy.bus = bus;
dummy.devfn = devfn;
id = pci_read_config32(&dummy, PCI_VENDOR_ID);
if (id == 0xffffffff || id == 0x00000000 ||
if (id == 0xffffffff || id == 0x00000000 ||
id == 0x0000ffff || id == 0xffff0000) {
break;
continue;
}
hdr_type = pci_read_config8(&dummy, PCI_HEADER_TYPE);
pos = 0;
@@ -521,19 +521,151 @@ unsigned int pci_scan_bus(struct device *bus, unsigned int max)
flags = pci_read_config16(&dummy, pos + PCI_CAP_FLAGS);
printk_debug("flags: 0x%04x\n", (unsigned)flags);
if ((flags >> 13) == 0) {
unsigned count;
/* Clear the unitid */
flags &= ~0x1f;
flags |= next_unitid & 0x1f;
count = (flags >> 5) & 0x1f;
printk_debug("unitid: 0x%02x, count: 0x%02x\n",
next_unitid, count);
pci_write_config16(&dummy, pos + PCI_CAP_FLAGS, flags);
next_unitid += count;
break;
}
}
pos = pci_read_config8(&dummy, pos + PCI_CAP_LIST_NEXT);
}
}
/* If present assign unitid to a hypertransport chain */
last_unitid = 0;
next_unitid = 1;
do {
struct device dummy;
uint32_t id;
uint8_t hdr_type, pos, previous_pos;
previous_unitid = last_unitid;
last_unitid = next_unitid;
/* Read the next unassigned device off the stack */
dummy.bus = bus;
dummy.devfn = 0;
id = pci_read_config32(&dummy, PCI_VENDOR_ID);
/* If the chain is enumerated quit */
if (id == 0xffffffff || id == 0x00000000 ||
id == 0x0000ffff || id == 0xffff0000) {
break;
}
hdr_type = pci_read_config8(&dummy, PCI_HEADER_TYPE);
pos = 0;
switch(hdr_type & 0x7f) {
case PCI_HEADER_TYPE_NORMAL:
case PCI_HEADER_TYPE_BRIDGE:
pos = PCI_CAPABILITY_LIST;
break;
}
if (pos > PCI_CAP_LIST_NEXT) {
pos = pci_read_config8(&dummy, pos);
}
while(pos != 0) { /* loop through the linked list */
uint8_t cap;
cap = pci_read_config8(&dummy, pos + PCI_CAP_LIST_ID);
printk_debug("Capability: 0x%02x @ 0x%02x\n", cap, pos);
if (cap == PCI_CAP_ID_HT) {
uint16_t flags;
uint16_t links;
flags = pci_read_config16(&dummy, pos + PCI_CAP_FLAGS);
printk_debug("flags: 0x%04x\n", (unsigned)flags);
if ((flags >> 13) == 0) { /* Entry is a Slave secondary */
struct device last, previous;
unsigned count;
unsigned width;
flags &= ~0x1f; /* mask out base unit ID */
flags |= next_unitid & 0x1f; /* assign ID */
count = (flags >> 5) & 0x1f; /* get unit count */
printk_debug("unitid: 0x%02x, count: 0x%02x\n",
next_unitid, count);
pci_write_config16(&dummy, pos + PCI_CAP_FLAGS, flags);
next_unitid += count;
if (previous_unitid == 0) { /* the link is back to the host */
/* calculate the previous pos for the host */
previous_pos = 0x80;
previous.bus = 0;
previous.devfn = 0x18 << 3;
#warning "FIXME we should not hard code this!"
} else {
previous.bus = bus;
previous.devfn = previous_unitid << 3;
}
last.bus = bus;
last.devfn = last_unitid << 3;
/* Set link width and frequency */
flags = pci_read_config16(&last, pos + PCI_HT_CAP_SLAVE_FREQ_CAP0);
cap = pci_read_config8(&last, pos + PCI_HT_CAP_SLAVE_WIDTH0);
if(previous_unitid == 0) { /* the link is back to the host */
links = pci_read_config16(&previous,
previous_pos + PCI_HT_CAP_HOST_FREQ_CAP);
width = pci_read_config8(&previous,
previous_pos + PCI_HT_CAP_HOST_WIDTH);
}
else { /* The link is back up the chain */
links = pci_read_config16(&previous,
previous_pos + PCI_HT_CAP_SLAVE_FREQ_CAP1);
width = pci_read_config8(&previous,
previous_pos + PCI_HT_CAP_SLAVE_WIDTH1);
}
/* Calculate the highest possible frequency */
links &= flags;
for(flags = 0x40, count = 6; count; count--, flags >>= 1) {
if(flags & links) break;
}
/* Calculate the highest width */
width &= cap;
/* set the present device */
if(count != pci_read_config8(&last, pos + PCI_HT_CAP_HOST_FREQ)) {
pci_write_config8(&last, pos + PCI_HT_CAP_HOST_FREQ, count);
reset_needed = 1;
}
if(width != pci_read_config8(&last, pos + PCI_HT_CAP_SLAVE_WIDTH0 + 1)) {
pci_write_config8(&last,
pos + PCI_HT_CAP_SLAVE_WIDTH0 + 1, width);
reset_needed = 1;
}
/* set the upstream device */
if(previous_unitid == 0) { /* the link is back to the host */
cap = pci_read_config8(&previous, previous_pos + PCI_HT_CAP_HOST_FREQ);
cap &= 0x0f;
if(count != cap) {
pci_write_config8(&previous,
previous_pos + PCI_HT_CAP_HOST_FREQ, count);
reset_needed = 1;
}
cap = pci_read_config8(&previous, previous_pos + PCI_HT_CAP_HOST_WIDTH + 1);
if(width != cap) {
pci_write_config8(&previous,
previous_pos + PCI_HT_CAP_HOST_WIDTH + 1, width);
reset_needed = 1;
}
}
else { /* The link is back up the chain */
cap = pci_read_config8(&previous,
previous_pos + PCI_HT_CAP_SLAVE_FREQ1);
cap &= 0x0f;
if(count != cap) {
pci_write_config8(&previous,
previous_pos + PCI_HT_CAP_SLAVE_FREQ1, count);
reset_needed = 1;
}
cap = pci_read_config8(&previous,
previous_pos + PCI_HT_CAP_SLAVE_WIDTH1 + 1);
if(width != cap) {
pci_write_config8(&previous,
previous_pos + PCI_HT_CAP_SLAVE_WIDTH1, width);
reset_needed = 1;
}
}
break;
}
}
pos = pci_read_config8(&dummy, pos + PCI_CAP_LIST_NEXT);
}
previous_pos = pos;
} while((last_unitid != next_unitid) && (next_unitid <= 0x1f));
#endif /* HYPERTRANSPORT_SUPPORT */