/*
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * 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.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <console/console.h>
#include <device/device.h>
#include <arch/pciconf.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pci_ops.h>
#include <arch/types.h>

/* walk up the tree from the current dev, in an attempt to find a bus that has ops_pci_bus set */
/* the assumption here being that if it has ops_pci_bus set, then it can do bus operations */
static struct bus *get_pbus(struct device * dev)
{
	struct bus *pbus = dev->bus;
	while(pbus && pbus->dev && !ops_pci_bus(pbus)) {
		pbus = pbus->dev->bus;
	}
	if (!pbus || !pbus->dev || !pbus->dev->ops || !pbus->dev->ops->ops_pci_bus) {
		printk(BIOS_ALERT,"%s: %s(%s) Cannot find pci bus operations", __func__, dev->dtsname, dev_path(dev));
		die("");
		for(;;);
	}
	return pbus;
}

u8 pci_read_config8(struct device * dev, unsigned where)
{
	struct bus *pbus = get_pbus(dev);
	return ops_pci_bus(pbus)->read8(pbus, dev->bus->secondary, dev->path.u.pci.devfn, where);
}

u16 pci_read_config16(struct device * dev, unsigned where)
{
	struct bus *pbus = get_pbus(dev);
	return ops_pci_bus(pbus)->read16(pbus, dev->bus->secondary, dev->path.u.pci.devfn, where);
}

u32 pci_read_config32(struct device * dev, unsigned where)
{
	struct bus *pbus = get_pbus(dev);
	return ops_pci_bus(pbus)->read32(pbus, dev->bus->secondary, dev->path.u.pci.devfn, where);
}

void pci_write_config8(struct device * dev, unsigned where, u8 val)
{
	struct bus *pbus = get_pbus(dev);
	ops_pci_bus(pbus)->write8(pbus, dev->bus->secondary, dev->path.u.pci.devfn, where, val);
}

void pci_write_config16(struct device * dev, unsigned where, u16 val)
{
	struct bus *pbus = get_pbus(dev);
	ops_pci_bus(pbus)->write16(pbus, dev->bus->secondary, dev->path.u.pci.devfn, where, val);
}

void pci_write_config32(struct device * dev, unsigned where, u32 val)
{
	struct bus *pbus = get_pbus(dev);
	ops_pci_bus(pbus)->write32(pbus, dev->bus->secondary, dev->path.u.pci.devfn, where, val);
}