/*-
 * Copyright (c) 2011 Advanced Computing Technologies LLC
 * Written by: John H. Baldwin <jhb@FreeBSD.org>
 * All rights reserved.
 *
 * 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.
 *
 * 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * Support APIs for Host to PCI bridge drivers and drivers that
 * provide PCI domains.
 */

#include <sys/types.h>
#include <sys/bus.h>
#include <sys/rman.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcib_private.h>

/*
 * Try to read the bus number of a host-PCI bridge using appropriate config
 * registers.
 */
int
host_pcib_get_busno(pci_read_config_fn read_config, int bus, int slot, int func,
    uint8_t *busnum)
{
	uint32_t id;

	id = read_config(bus, slot, func, PCIR_DEVVENDOR, 4);
	if (id == 0xffffffff)
		return (0);

	switch (id) {
	case 0x12258086:
		/* Intel 824?? */
		/* XXX This is a guess */
		/* *busnum = read_config(bus, slot, func, 0x41, 1); */
		*busnum = bus;
		break;
	case 0x84c48086:
		/* Intel 82454KX/GX (Orion) */
		*busnum = read_config(bus, slot, func, 0x4a, 1);
		break;
	case 0x84ca8086:
		/*
		 * For the 450nx chipset, there is a whole bundle of
		 * things pretending to be host bridges. The MIOC will 
		 * be seen first and isn't really a pci bridge (the
		 * actual busses are attached to the PXB's). We need to 
		 * read the registers of the MIOC to figure out the
		 * bus numbers for the PXB channels.
		 *
		 * Since the MIOC doesn't have a pci bus attached, we
		 * pretend it wasn't there.
		 */
		return (0);
	case 0x84cb8086:
		switch (slot) {
		case 0x12:
			/* Intel 82454NX PXB#0, Bus#A */
			*busnum = read_config(bus, 0x10, func, 0xd0, 1);
			break;
		case 0x13:
			/* Intel 82454NX PXB#0, Bus#B */
			*busnum = read_config(bus, 0x10, func, 0xd1, 1) + 1;
			break;
		case 0x14:
			/* Intel 82454NX PXB#1, Bus#A */
			*busnum = read_config(bus, 0x10, func, 0xd3, 1);
			break;
		case 0x15:
			/* Intel 82454NX PXB#1, Bus#B */
			*busnum = read_config(bus, 0x10, func, 0xd4, 1) + 1;
			break;
		}
		break;

		/* ServerWorks -- vendor 0x1166 */
	case 0x00051166:
	case 0x00061166:
	case 0x00081166:
	case 0x00091166:
	case 0x00101166:
	case 0x00111166:
	case 0x00171166:
	case 0x01011166:
	case 0x010f1014:
	case 0x01101166:
	case 0x02011166:
	case 0x02251166:
	case 0x03021014:
		*busnum = read_config(bus, slot, func, 0x44, 1);
		break;

		/* Compaq/HP -- vendor 0x0e11 */
	case 0x60100e11:
		*busnum = read_config(bus, slot, func, 0xc8, 1);
		break;
	default:
		/* Don't know how to read bus number. */
		return 0;
	}

	return 1;
}