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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 Advanced Micro Devices, Inc.
* Copyright (C) 2008 coresystems GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <libpayload.h>
#include <pci.h>
u8 pci_read_config8(pcidev_t device, u16 reg)
{
outl(device | (reg & ~3), 0xCF8);
return inb(0xCFC + (reg & 3));
}
u16 pci_read_config16(pcidev_t device, u16 reg)
{
outl(device | (reg & ~3), 0xCF8);
return inw(0xCFC + (reg & 3));
}
u32 pci_read_config32(pcidev_t device, u16 reg)
{
outl(device | (reg & ~3), 0xCF8);
return inl(0xCFC + (reg & 3));
}
void pci_write_config8(pcidev_t device, u16 reg, u8 val)
{
outl(device | (reg & ~3), 0xCF8);
outb(val, 0xCFC + (reg & 3));
}
void pci_write_config16(pcidev_t device, u16 reg, u16 val)
{
outl(device | (reg & ~3), 0xCF8);
outw(val, 0xCFC + (reg & 3));
}
void pci_write_config32(pcidev_t device, u16 reg, u32 val)
{
outl(device | (reg & ~3), 0xCF8);
outl(val, 0xCFC + (reg & 3));
}
static int find_on_bus(int bus, unsigned short vid, unsigned short did,
pcidev_t * dev)
{
int devfn;
u32 val;
unsigned char hdr;
for (devfn = 0; devfn < 0x100; devfn++) {
int func = devfn & 0x7;
int slot = (devfn >> 3) & 0x1f;
val = pci_read_config32(PCI_DEV(bus, slot, func),
REG_VENDOR_ID);
if (val == 0xffffffff || val == 0x00000000 ||
val == 0x0000ffff || val == 0xffff0000)
continue;
if (val == ((did << 16) | vid)) {
*dev = PCI_DEV(bus, slot, func);
return 1;
}
hdr = pci_read_config8(PCI_DEV(bus, slot, func),
REG_HEADER_TYPE);
hdr &= 0x7F;
if (hdr == HEADER_TYPE_BRIDGE || hdr == HEADER_TYPE_CARDBUS) {
unsigned int busses;
busses = pci_read_config32(PCI_DEV(bus, slot, func),
REG_PRIMARY_BUS);
busses = (busses >> 8) & 0xFF;
/* Avoid recursion if the new bus is the same as
* the old bus (insert lame The Who joke here) */
if ((busses != bus) &&
find_on_bus(busses, vid, did, dev))
return 1;
}
}
return 0;
}
int pci_find_device(u16 vid, u16 did, pcidev_t * dev)
{
return find_on_bus(0, vid, did, dev);
}
u32 pci_read_resource(pcidev_t dev, int bar)
{
return pci_read_config32(dev, 0x10 + (bar * 4));
}
void pci_set_bus_master(pcidev_t dev)
{
u16 val = pci_read_config16(dev, REG_COMMAND);
val |= REG_COMMAND_BM;
pci_write_config16(dev, REG_COMMAND, val);
}
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