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/*
* The PCI Library -- Generic Direct Access Functions
*
* Copyright (c) 1997--2022 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <string.h>
#include "internal.h"
void
pci_generic_scan_bus(struct pci_access *a, byte *busmap, int bus)
{
int dev, multi, ht;
struct pci_dev *t;
a->debug("Scanning bus %02x for devices...\n", bus);
if (busmap[bus])
{
a->warning("Bus %02x seen twice (firmware bug). Ignored.", bus);
return;
}
busmap[bus] = 1;
t = pci_alloc_dev(a);
t->bus = bus;
for (dev=0; dev<32; dev++)
{
t->dev = dev;
multi = 0;
for (t->func=0; !t->func || multi && t->func<8; t->func++)
{
u32 vd = pci_read_long(t, PCI_VENDOR_ID);
struct pci_dev *d;
if (!vd || vd == 0xffffffff)
continue;
ht = pci_read_byte(t, PCI_HEADER_TYPE);
if (!t->func)
multi = ht & 0x80;
ht &= 0x7f;
d = pci_alloc_dev(a);
d->bus = t->bus;
d->dev = t->dev;
d->func = t->func;
d->vendor_id = vd & 0xffff;
d->device_id = vd >> 16U;
d->known_fields = PCI_FILL_IDENT;
d->hdrtype = ht;
pci_link_dev(a, d);
switch (ht)
{
case PCI_HEADER_TYPE_NORMAL:
break;
case PCI_HEADER_TYPE_BRIDGE:
case PCI_HEADER_TYPE_CARDBUS:
pci_generic_scan_bus(a, busmap, pci_read_byte(t, PCI_SECONDARY_BUS));
break;
default:
a->debug("Device %04x:%02x:%02x.%d has unknown header type %02x.\n", d->domain, d->bus, d->dev, d->func, ht);
}
}
}
pci_free_dev(t);
}
void
pci_generic_scan(struct pci_access *a)
{
byte busmap[256];
memset(busmap, 0, sizeof(busmap));
pci_generic_scan_bus(a, busmap, 0);
}
static int
get_hdr_type(struct pci_dev *d)
{
if (d->hdrtype < 0)
d->hdrtype = pci_read_byte(d, PCI_HEADER_TYPE) & 0x7f;
return d->hdrtype;
}
void
pci_generic_fill_info(struct pci_dev *d, unsigned int flags)
{
struct pci_access *a = d->access;
if (want_fill(d, flags, PCI_FILL_IDENT))
{
d->vendor_id = pci_read_word(d, PCI_VENDOR_ID);
d->device_id = pci_read_word(d, PCI_DEVICE_ID);
}
if (want_fill(d, flags, PCI_FILL_CLASS))
d->device_class = pci_read_word(d, PCI_CLASS_DEVICE);
if (want_fill(d, flags, PCI_FILL_IRQ))
d->irq = pci_read_byte(d, PCI_INTERRUPT_LINE);
if (want_fill(d, flags, PCI_FILL_BASES))
{
int cnt = 0, i;
memset(d->base_addr, 0, sizeof(d->base_addr));
switch (get_hdr_type(d))
{
case PCI_HEADER_TYPE_NORMAL:
cnt = 6;
break;
case PCI_HEADER_TYPE_BRIDGE:
cnt = 2;
break;
case PCI_HEADER_TYPE_CARDBUS:
cnt = 1;
break;
}
if (cnt)
{
for (i=0; i<cnt; i++)
{
u32 x = pci_read_long(d, PCI_BASE_ADDRESS_0 + i*4);
if (!x || x == (u32) ~0)
continue;
if ((x & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO)
d->base_addr[i] = x;
else
{
if ((x & PCI_BASE_ADDRESS_MEM_TYPE_MASK) != PCI_BASE_ADDRESS_MEM_TYPE_64)
d->base_addr[i] = x;
else if (i >= cnt-1)
a->warning("%04x:%02x:%02x.%d: Invalid 64-bit address seen for BAR %d.", d->domain, d->bus, d->dev, d->func, i);
else
{
u32 y = pci_read_long(d, PCI_BASE_ADDRESS_0 + (++i)*4);
#ifdef PCI_HAVE_64BIT_ADDRESS
d->base_addr[i-1] = x | (((pciaddr_t) y) << 32);
#else
if (y)
a->warning("%04x:%02x:%02x.%d 64-bit device address ignored.", d->domain, d->bus, d->dev, d->func);
else
d->base_addr[i-1] = x;
#endif
}
}
}
}
}
if (want_fill(d, flags, PCI_FILL_ROM_BASE))
{
int reg = 0;
d->rom_base_addr = 0;
switch (get_hdr_type(d))
{
case PCI_HEADER_TYPE_NORMAL:
reg = PCI_ROM_ADDRESS;
break;
case PCI_HEADER_TYPE_BRIDGE:
reg = PCI_ROM_ADDRESS1;
break;
}
if (reg)
{
u32 u = pci_read_long(d, reg);
if (u != 0xffffffff)
d->rom_base_addr = u;
}
}
pci_scan_caps(d, flags);
}
static int
pci_generic_block_op(struct pci_dev *d, int pos, byte *buf, int len,
int (*r)(struct pci_dev *d, int pos, byte *buf, int len))
{
if ((pos & 1) && len >= 1)
{
if (!r(d, pos, buf, 1))
return 0;
pos++; buf++; len--;
}
if ((pos & 3) && len >= 2)
{
if (!r(d, pos, buf, 2))
return 0;
pos += 2; buf += 2; len -= 2;
}
while (len >= 4)
{
if (!r(d, pos, buf, 4))
return 0;
pos += 4; buf += 4; len -= 4;
}
if (len >= 2)
{
if (!r(d, pos, buf, 2))
return 0;
pos += 2; buf += 2; len -= 2;
}
if (len && !r(d, pos, buf, 1))
return 0;
return 1;
}
int
pci_generic_block_read(struct pci_dev *d, int pos, byte *buf, int len)
{
return pci_generic_block_op(d, pos, buf, len, d->access->methods->read);
}
int
pci_generic_block_write(struct pci_dev *d, int pos, byte *buf, int len)
{
return pci_generic_block_op(d, pos, buf, len, d->access->methods->write);
}
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