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libpayload: Support functions for Geode

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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
This commit is contained in:
Jordan Crouse
2008-04-10 22:50:44 +00:00
parent 30939bdffd
commit 234e87f137
6 changed files with 218 additions and 0 deletions
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92
payloads/libpayload/drivers/pci.c Normal file
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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 Advanced Micro Devices, Inc.
*
* 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>
static int find_on_bus(int bus, unsigned short vid, unsigned short did,
pcidev_t * dev)
{
int devfn;
unsigned int val;
unsigned char hdr;
for (devfn = 0; devfn < 0x100; devfn++) {
pci_read_dword(bus, devfn, REG_VENDOR_ID, &val);
if (val == 0xffffffff || val == 0x00000000 ||
val == 0x0000ffff || val == 0xffff0000)
continue;
if (val == ((did << 16) | vid)) {
*dev = PCIDEV(bus, devfn);
return 1;
}
pci_read_byte(bus, devfn, REG_HEADER_TYPE, &hdr);
hdr &= 0x7F;
if (hdr == HEADER_TYPE_BRIDGE || hdr == HEADER_TYPE_CARDBUS) {
unsigned int busses;
pci_read_dword(bus, devfn, REG_PRIMARY_BUS, &busses);
if (find_on_bus((busses >> 8) & 0xFF, vid, did, dev))
return 1;
}
}
return 0;
}
void pci_read_dword(unsigned int bus, unsigned int devfn,
unsigned int reg, unsigned int *val)
{
outl(PCI_ADDR(bus, devfn, reg), 0xCF8);
*val = inl(0xCFC);
}
void pci_read_byte(unsigned int bus, unsigned int devfn,
unsigned int reg, unsigned char *val)
{
outl(PCI_ADDR(bus, devfn, reg), 0xCF8);
*val = inb(0xCFC + (reg & 3));
}
int pci_find_device(unsigned short vid, unsigned short did, pcidev_t * dev)
{
return find_on_bus(0, vid, did, dev);
}
unsigned int pci_read_resource(pcidev_t dev, int bar)
{
unsigned int val;
pci_read_dword(PCIDEV_BUS(dev), PCIDEV_DEVFN(dev), 0x10 + (bar * 4),
&val);
return val;
}