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