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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2004 Linux Networx
* (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
* Copyright (C) 2009 coresystems GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <console/console.h>
#include <device/pci.h>
#include <device/pci_ops.h>
static const struct pci_bus_operations *pci_bus_ops(struct bus *bus, struct device *dev)
{
const struct pci_bus_operations *bops;
bops = NULL;
if (bus && bus->dev && bus->dev->ops && bus->dev->ops->ops_pci_bus) {
bops = bus->dev->ops->ops_pci_bus(dev);
}
if (!bops)
bops = pci_bus_default_ops();
return bops;
}
/*
* The only consumer of the return value of get_pbus() is pci_bus_ops().
* pci_bus_ops() can handle being passed NULL and auto-picks working ops.
*/
static struct bus *get_pbus(struct device *dev)
{
struct bus *pbus = NULL;
if (!dev)
die("get_pbus: dev is NULL!\n");
else
pbus = dev->bus;
while (pbus && pbus->dev && !pci_bus_ops(pbus, dev)) {
if (pbus == pbus->dev->bus) {
printk(BIOS_ALERT, "%s in endless loop looking for a "
"parent bus with pci_bus_ops for %s, breaking "
"out.\n", __func__, dev_path(dev));
break;
}
pbus = pbus->dev->bus;
}
if (!pbus || !pbus->dev || !pbus->dev->ops
|| !pbus->dev->ops->ops_pci_bus) {
/* This can happen before the device tree is fully set up. */
// printk(BIOS_EMERG, "%s: Cannot find PCI bus operations.\n",
// dev_path(dev));
pbus = NULL;
}
return pbus;
}
u8 pci_read_config8(struct device *dev, unsigned int where)
{
struct bus *pbus = get_pbus(dev);
return pci_bus_ops(pbus, dev)->read8(dev->bus->secondary,
dev->path.pci.devfn, where);
}
u16 pci_read_config16(struct device *dev, unsigned int where)
{
struct bus *pbus = get_pbus(dev);
return pci_bus_ops(pbus, dev)->read16(dev->bus->secondary,
dev->path.pci.devfn, where);
}
u32 pci_read_config32(struct device *dev, unsigned int where)
{
struct bus *pbus = get_pbus(dev);
return pci_bus_ops(pbus, dev)->read32(dev->bus->secondary,
dev->path.pci.devfn, where);
}
void pci_write_config8(struct device *dev, unsigned int where, u8 val)
{
struct bus *pbus = get_pbus(dev);
pci_bus_ops(pbus, dev)->write8(dev->bus->secondary,
dev->path.pci.devfn, where, val);
}
void pci_write_config16(struct device *dev, unsigned int where, u16 val)
{
struct bus *pbus = get_pbus(dev);
pci_bus_ops(pbus, dev)->write16(dev->bus->secondary,
dev->path.pci.devfn, where, val);
}
void pci_write_config32(struct device *dev, unsigned int where, u32 val)
{
struct bus *pbus = get_pbus(dev);
pci_bus_ops(pbus, dev)->write32(dev->bus->secondary,
dev->path.pci.devfn, where, val);
}
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