234e87f137
The Geode video driver will require a number of support functions, including udelay(), PCI bus walking and MSRs. This adds those functions in preparation for the actual code. Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3231 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
93 lines
2.9 KiB
C
93 lines
2.9 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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*
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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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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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unsigned int val;
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unsigned char hdr;
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for (devfn = 0; devfn < 0x100; devfn++) {
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pci_read_dword(bus, devfn, REG_VENDOR_ID, &val);
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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 = PCIDEV(bus, devfn);
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return 1;
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}
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pci_read_byte(bus, devfn, REG_HEADER_TYPE, &hdr);
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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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pci_read_dword(bus, devfn, REG_PRIMARY_BUS, &busses);
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if (find_on_bus((busses >> 8) & 0xFF, 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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void pci_read_dword(unsigned int bus, unsigned int devfn,
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unsigned int reg, unsigned int *val)
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{
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outl(PCI_ADDR(bus, devfn, reg), 0xCF8);
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*val = inl(0xCFC);
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}
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void pci_read_byte(unsigned int bus, unsigned int devfn,
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unsigned int reg, unsigned char *val)
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{
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outl(PCI_ADDR(bus, devfn, reg), 0xCF8);
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*val = inb(0xCFC + (reg & 3));
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}
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int pci_find_device(unsigned short vid, unsigned short 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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unsigned int pci_read_resource(pcidev_t dev, int bar)
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{
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unsigned int val;
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pci_read_dword(PCIDEV_BUS(dev), PCIDEV_DEVFN(dev), 0x10 + (bar * 4),
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&val);
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return val;
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}
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