kolibrios-gitea/drivers/old/agp/pci.inc

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#define PCI_FIND_CAP_TTL 48
static int __pci_find_next_cap_ttl(PCITAG pciTag, u8_t pos,
int cap, int *ttl)
{
u8_t id;
while ((*ttl)--)
{
pos = pciReadByte(pciTag, pos);
if (pos < 0x40)
break;
pos &= ~3;
id = pciReadByte(pciTag, pos + PCI_CAP_LIST_ID);
if (id == 0xff)
break;
if (id == cap)
return pos;
pos += PCI_CAP_LIST_NEXT;
}
return 0;
}
static int __pci_find_next_cap(PCITAG pciTag, u8_t pos, int cap)
{
int ttl = PCI_FIND_CAP_TTL;
return __pci_find_next_cap_ttl(pciTag, pos, cap, &ttl);
}
static int __pci_bus_find_cap_start(PCITAG pciTag)
{
u16_t status;
u8_t hdr_type;
status = pciReadWord(pciTag, PCI_STATUS);
if (!(status & PCI_STATUS_CAP_LIST))
return 0;
hdr_type = pciReadByte(pciTag, 0x0E);
switch (hdr_type)
{
case PCI_HEADER_TYPE_NORMAL:
case PCI_HEADER_TYPE_BRIDGE:
return PCI_CAPABILITY_LIST;
case PCI_HEADER_TYPE_CARDBUS:
return PCI_CB_CAPABILITY_LIST;
default:
return 0;
}
return 0;
}
int pci_find_capability(PCITAG pciTag, int cap)
{
int pos;
pos = __pci_bus_find_cap_start(pciTag);
if (pos)
pos = __pci_find_next_cap(pciTag, pos, cap);
return pos;
}
PCITAG pci_find_class(u16_t class)
{
u32_t bus, last_bus;
PCITAG tag;
if( (last_bus = PciApi(1))==-1)
return -1;
for(bus=0;bus<=last_bus;bus++)
{
u32_t devfn;
for(devfn=0;devfn<256;devfn++)
{
u16_t devclass;
devclass = PciRead16(bus,devfn, 0x0A);
if( devclass != class)
continue;
return pciTag(bus,(devfn>>3)&0x1F,devfn&0x7);
};
};
return -1;
};
PCITAG pci_get_device(u32_t vendor, u32_t device, PCITAG from)
{
u32_t bus, last_bus;
u32_t devfn;
if( (last_bus = PciApi(1))==-1)
return -1;
bus = PCI_BUS_FROM_TAG(from);
devfn = PCI_DFN_FROM_TAG(from);
devfn++;
for(;bus<=last_bus; bus++)
{
for(;devfn < 256;devfn++)
{
u32_t tmp;
u32_t dev_vendor;
u32_t dev_id;
tmp = PciRead32(bus,devfn, 0);
dev_vendor = (u16_t)tmp;
dev_id = tmp >> 16;
if ((vendor == PCI_ANY_ID || dev_vendor == vendor))
return pciTag(bus,(devfn>>3)&0x1F,devfn&0x7);
};
};
return -1;
}