freebsd-dev/sys/powerpc/mpc85xx/pci_ocp.c

/*-
 * Copyright 2006-2007 by Juniper Networks.
 * 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.
 * 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 ``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 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("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ktr.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/endian.h>

#include <vm/vm.h>
#include <vm/pmap.h>

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

#include "pcib_if.h"

#include <machine/resource.h>
#include <machine/bus.h>
#include <machine/ocpbus.h>
#include <machine/spr.h>

#include <powerpc/mpc85xx/ocpbus.h>

#define	REG_CFG_ADDR	0x0000
#define	CONFIG_ACCESS_ENABLE	0x80000000

#define	REG_CFG_DATA	0x0004
#define	REG_INT_ACK	0x0008

#define	REG_POTAR(n)	(0x0c00 + 0x20 * (n))
#define	REG_POTEAR(n)	(0x0c04 + 0x20 * (n))
#define	REG_POWBAR(n)	(0x0c08 + 0x20 * (n))
#define	REG_POWAR(n)	(0x0c10 + 0x20 * (n))

#define	REG_PITAR(n)	(0x0e00 - 0x20 * (n))
#define	REG_PIWBAR(n)	(0x0e08 - 0x20 * (n))
#define	REG_PIWBEAR(n)	(0x0e0c - 0x20 * (n))
#define	REG_PIWAR(n)	(0x0e10 - 0x20 * (n))

struct pci_ocp_softc {
	device_t	sc_dev;

	struct rman	sc_iomem;
	bus_addr_t	sc_iomem_va;		/* Virtual mapping. */
	bus_addr_t	sc_iomem_alloc;		/* Next allocation. */
	struct rman	sc_ioport;
	bus_addr_t	sc_ioport_va;		/* Virtual mapping. */
	bus_addr_t	sc_ioport_alloc;	/* Next allocation. */

	struct resource	*sc_res;
	bus_space_handle_t sc_bsh;
	bus_space_tag_t	sc_bst;
	int		sc_rid;

	int		sc_busnr;
	int		sc_pcie:1;
};

static int pci_ocp_attach(device_t);
static int pci_ocp_probe(device_t);

static struct resource *pci_ocp_alloc_resource(device_t, device_t, int, int *,
    u_long, u_long, u_long, u_int);
static int pci_ocp_read_ivar(device_t, device_t, int, uintptr_t *);
static int pci_ocp_release_resource(device_t, device_t, int, int,
    struct resource *);
static int pci_ocp_write_ivar(device_t, device_t, int, uintptr_t);

static int pci_ocp_maxslots(device_t);
static uint32_t pci_ocp_read_config(device_t, u_int, u_int, u_int, u_int, int);
static void pci_ocp_write_config(device_t, u_int, u_int, u_int, u_int,
    uint32_t, int);

/*
 * Bus interface definitions.
 */
static device_method_t pci_ocp_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		pci_ocp_probe),
	DEVMETHOD(device_attach,	pci_ocp_attach),

	/* Bus interface */
	DEVMETHOD(bus_print_child,	bus_generic_print_child),
	DEVMETHOD(bus_read_ivar,	pci_ocp_read_ivar),
	DEVMETHOD(bus_write_ivar,	pci_ocp_write_ivar),
	DEVMETHOD(bus_alloc_resource,	pci_ocp_alloc_resource),
	DEVMETHOD(bus_release_resource,	pci_ocp_release_resource),
	DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
	DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
	DEVMETHOD(bus_setup_intr,	bus_generic_setup_intr),
	DEVMETHOD(bus_teardown_intr,	bus_generic_teardown_intr),

	/* pcib interface */
	DEVMETHOD(pcib_maxslots,	pci_ocp_maxslots),
	DEVMETHOD(pcib_read_config,	pci_ocp_read_config),
	DEVMETHOD(pcib_write_config,	pci_ocp_write_config),
	DEVMETHOD(pcib_route_interrupt,	pcib_route_interrupt),

	{ 0, 0 }
};

static driver_t pci_ocp_driver = {
	"pcib",
	pci_ocp_methods,
	sizeof(struct pci_ocp_softc),
};

devclass_t pcib_devclass;

DRIVER_MODULE(pcib, ocpbus, pci_ocp_driver, pcib_devclass, 0, 0);

static uint32_t
pci_ocp_cfgread(struct pci_ocp_softc *sc, u_int bus, u_int slot, u_int func,
    u_int reg, int bytes)
{
	uint32_t addr, data;

	if (bus == sc->sc_busnr)
		bus = 0;

	addr = CONFIG_ACCESS_ENABLE;
	addr |= (bus & 0xff) << 16;
	addr |= (slot & 0x1f) << 11;
	addr |= (func & 0x7) << 8;
	addr |= reg & 0xfc;
	if (sc->sc_pcie)
		addr |= (reg & 0xf00) << 16;
	bus_space_write_4(sc->sc_bst, sc->sc_bsh, REG_CFG_ADDR, addr);

	switch (bytes) {
	case 1:
		data = bus_space_read_1(sc->sc_bst, sc->sc_bsh,
		    REG_CFG_DATA + (reg & 3));
		break;
	case 2:
		data = le16toh(bus_space_read_2(sc->sc_bst, sc->sc_bsh,
		    REG_CFG_DATA + (reg & 2)));
		break;
	case 4:
		data = le32toh(bus_space_read_4(sc->sc_bst, sc->sc_bsh,
		    REG_CFG_DATA));
		break;
	default:
		data = ~0;
		break;
	}
	return (data);
}

static void
pci_ocp_cfgwrite(struct pci_ocp_softc *sc, u_int bus, u_int slot, u_int func,
    u_int reg, uint32_t data, int bytes)
{
	uint32_t addr;

	if (bus == sc->sc_busnr)
		bus = 0;

	addr = CONFIG_ACCESS_ENABLE;
	addr |= (bus & 0xff) << 16;
	addr |= (slot & 0x1f) << 11;
	addr |= (func & 0x7) << 8;
	addr |= reg & 0xfc;
	if (sc->sc_pcie)
		addr |= (reg & 0xf00) << 16;
	bus_space_write_4(sc->sc_bst, sc->sc_bsh, REG_CFG_ADDR, addr);

	switch (bytes) {
	case 1:
		bus_space_write_1(sc->sc_bst, sc->sc_bsh,
		    REG_CFG_DATA + (reg & 3), data);
		break;
	case 2:
		bus_space_write_2(sc->sc_bst, sc->sc_bsh,
		    REG_CFG_DATA + (reg & 2), htole16(data));
		break;
	case 4:
		bus_space_write_4(sc->sc_bst, sc->sc_bsh,
		    REG_CFG_DATA, htole32(data));
		break;
	}
}

#if 0
static void
dump(struct pci_ocp_softc *sc)
{
	unsigned int i;

#define RD(o)	bus_space_read_4(sc->sc_bst, sc->sc_bsh, o)
	for (i = 0; i < 5; i++) {
		printf("POTAR%u  =0x%08x\n", i, RD(REG_POTAR(i)));
		printf("POTEAR%u =0x%08x\n", i, RD(REG_POTEAR(i)));
		printf("POWBAR%u =0x%08x\n", i, RD(REG_POWBAR(i)));
		printf("POWAR%u  =0x%08x\n", i, RD(REG_POWAR(i)));
	}
	printf("\n");
	for (i = 1; i < 4; i++) {
		printf("PITAR%u  =0x%08x\n", i, RD(REG_PITAR(i)));
		printf("PIWBAR%u =0x%08x\n", i, RD(REG_PIWBAR(i)));
		printf("PIWBEAR%u=0x%08x\n", i, RD(REG_PIWBEAR(i)));
		printf("PIWAR%u  =0x%08x\n", i, RD(REG_PIWAR(i)));
	}
	printf("\n");
#undef RD

	for (i = 0; i < 0x48; i += 4) {
		printf("cfg%02x=0x%08x\n", i, pci_ocp_cfgread(sc, 0, 0, 0,
		    i, 4));
	}
}
#endif

static int
pci_ocp_maxslots(device_t dev)
{
	struct pci_ocp_softc *sc = device_get_softc(dev);

	return ((sc->sc_pcie) ? 0 : 30);
}

static uint32_t
pci_ocp_read_config(device_t dev, u_int bus, u_int slot, u_int func,
    u_int reg, int bytes)
{
	struct pci_ocp_softc *sc = device_get_softc(dev);

	if (bus == sc->sc_busnr && !sc->sc_pcie && slot < 10)
		return (~0);
	return (pci_ocp_cfgread(sc, bus, slot, func, reg, bytes));
}

static void
pci_ocp_write_config(device_t dev, u_int bus, u_int slot, u_int func,
    u_int reg, uint32_t val, int bytes)
{
	struct pci_ocp_softc *sc = device_get_softc(dev);

	if (bus == sc->sc_busnr && !sc->sc_pcie && slot < 10)
		return;
	pci_ocp_cfgwrite(sc, bus, slot, func, reg, val, bytes);
}

static int
pci_ocp_probe(device_t dev)
{
	char buf[128];
	struct pci_ocp_softc *sc;
	const char *mpcid, *type;
	device_t parent;
	u_long start, size;
	uintptr_t devtype;
	uint32_t cfgreg;
	int error;

	parent = device_get_parent(dev);
	error = BUS_READ_IVAR(parent, dev, OCPBUS_IVAR_DEVTYPE, &devtype);
	if (error)
		return (error);
	if (devtype != OCPBUS_DEVTYPE_PCIB)
		return (ENXIO);

	sc = device_get_softc(dev);

	sc->sc_rid = 0;
	sc->sc_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->sc_rid,
	    RF_ACTIVE);
	if (sc->sc_res == NULL)
		return (ENXIO);

	sc->sc_bst = rman_get_bustag(sc->sc_res);
	sc->sc_bsh = rman_get_bushandle(sc->sc_res);
        sc->sc_busnr = 0;

	error = ENOENT;
	cfgreg = pci_ocp_cfgread(sc, 0, 0, 0, PCIR_VENDOR, 2);
	if (cfgreg != 0x1057 && cfgreg != 0x1957)
		goto out;
	cfgreg = pci_ocp_cfgread(sc, 0, 0, 0, PCIR_DEVICE, 2);
	switch (cfgreg) {
	case 0x000a:
		mpcid = "8555E";
		break;
	case 0x0012:
		mpcid = "8548E";
		break;
	case 0x0013:
		mpcid = "8548";
		break;
	/*
	 * Documentation from Freescale is incorrect.
	 * Use right values after documentation is corrected.
	 */
	case 0x0030:
		mpcid = "8544E";
		break;
	case 0x0031:
		mpcid = "8544";
		break;
	case 0x0032:
		mpcid = "8544";
		break;
	default:
		goto out;
	}

	type = "PCI";
	cfgreg = pci_ocp_cfgread(sc, 0, 0, 0, PCIR_CAP_PTR, 1);
	while (cfgreg != 0) {
		cfgreg = pci_ocp_cfgread(sc, 0, 0, 0, cfgreg, 2);
		switch (cfgreg & 0xff) {
		case PCIY_PCIX:		/* PCI-X */
			type = "PCI-X";
			break;
		case PCIY_EXPRESS:	/* PCI Express */
			type = "PCI Express";
			sc->sc_pcie = 1;
			break;
		}
		cfgreg = (cfgreg >> 8) & 0xff;
	}

	error = bus_get_resource(dev, SYS_RES_MEMORY, 1, &start, &size);
	if (error || start == 0 || size == 0)
		goto out;

	snprintf(buf, sizeof(buf),
	    "Freescale MPC%s %s host controller", mpcid, type);
	device_set_desc_copy(dev, buf);
	error = BUS_PROBE_DEFAULT;

out:
	bus_release_resource(dev, SYS_RES_MEMORY, sc->sc_rid, sc->sc_res);
	return (error);
}

static int
pci_ocp_init_bar(struct pci_ocp_softc *sc, int bus, int slot, int func,
    int barno)
{
	bus_addr_t *allocp;
	uint32_t addr, mask, size;
	int reg, width;

	reg = PCIR_BAR(barno);
	pci_ocp_write_config(sc->sc_dev, bus, slot, func, reg, ~0, 4);
	size = pci_ocp_read_config(sc->sc_dev, bus, slot, func, reg, 4);
	if (size == 0)
		return (1);
	width = ((size & 7) == 4) ? 2 : 1;

	if (size & 1) {		/* I/O port */
		allocp = &sc->sc_ioport_alloc;
		size &= ~3;
		if ((size & 0xffff0000) == 0)
			size |= 0xffff0000;
	} else {		/* memory */
		allocp = &sc->sc_iomem_alloc;
		size &= ~15;
	}
	mask = ~size;
	size = mask + 1;
	/* Sanity check (must be a power of 2). */
	if (size & mask)
		return (width);

	addr = (*allocp + mask) & ~mask;
	*allocp = addr + size;

	if (bootverbose)
		printf("PCI %u:%u:%u:%u: reg %x: size=%08x: addr=%08x\n",
		    device_get_unit(sc->sc_dev), bus, slot, func, reg,
		    size, addr);

	pci_ocp_write_config(sc->sc_dev, bus, slot, func, reg, addr, 4);
	if (width == 2)
		pci_ocp_write_config(sc->sc_dev, bus, slot, func, reg + 4,
		    0, 4);
	return (width);
}

static u_int
pci_ocp_route_int(struct pci_ocp_softc *sc, u_int bus, u_int slot, u_int func,
    u_int intpin)
{
	u_int intline;

	/*
	 * Default interrupt routing.
	 */
	if (intpin != 0) {
		intline = intpin - 1;
		intline += (bus != sc->sc_busnr) ? slot : 0;
		intline = PIC_IRQ_EXT(intline & 3);
	} else
		intline = 0xff;

	if (bootverbose)
		printf("PCI %u:%u:%u:%u: intpin %u: intline=%u\n",
		    device_get_unit(sc->sc_dev), bus, slot, func,
		    intpin, intline);

	return (intline);
}

static int
pci_ocp_init(struct pci_ocp_softc *sc, int bus, int maxslot)
{
	int secbus, slot;
	int func, maxfunc;
	int bar, maxbar;
	uint16_t vendor, device;
	uint8_t cr8, command, hdrtype, class, subclass;
	uint8_t intline, intpin;

	secbus = bus;
	for (slot = 0; slot < maxslot; slot++) {
		maxfunc = 0;
		for (func = 0; func <= maxfunc; func++) {
			hdrtype = pci_ocp_read_config(sc->sc_dev, bus, slot,
			    func, PCIR_HDRTYPE, 1);
			if ((hdrtype & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
				continue;

			if (func == 0 && (hdrtype & PCIM_MFDEV))
				maxfunc = PCI_FUNCMAX;

			command = pci_ocp_read_config(sc->sc_dev, bus, slot,
			    func, PCIR_COMMAND, 1);
			command &= ~(PCIM_CMD_MEMEN | PCIM_CMD_PORTEN);
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_COMMAND, command, 1);

			vendor = pci_ocp_read_config(sc->sc_dev, bus, slot,
			    func, PCIR_VENDOR, 2);
			device = pci_ocp_read_config(sc->sc_dev, bus, slot,
			    func, PCIR_DEVICE, 2);

			/*
			 * Make sure the ATA controller on the VIA82C686
			 * South bridge is enabled.
			 */
			if (vendor == 0x1106 && device == 0x0686) {
				/* Enable the ATA controller. */
				cr8 = pci_ocp_read_config(sc->sc_dev, bus,
				    slot, func, 0x48, 1);
				if (cr8 & 2) {
					device_printf(sc->sc_dev,
					    "enabling ATA controller\n");
					pci_ocp_write_config(sc->sc_dev, bus,
					    slot, func, 0x48, cr8 & ~2, 1);
				}
			}
			if (vendor == 0x1106 && device == 0x0571) {
				pci_ocp_write_config(sc->sc_dev, bus, slot,
				    func, 0xc4, 0x00, 1);
				/* Set legacy mode. */
				pci_ocp_write_config(sc->sc_dev, bus, slot,
				    func, 0x40, 0x08, 1);
				pci_ocp_write_config(sc->sc_dev, bus, slot,
				    func, PCIR_PROGIF, 0x00, 1);
				pci_ocp_write_config(sc->sc_dev, bus, slot,
				    func, 0x42, 0x09, 1);
				pci_ocp_write_config(sc->sc_dev, bus, slot,
				    func, 0x40, 0x0b, 1);
			}

			/* Program the base address registers. */
			maxbar = (hdrtype & PCIM_HDRTYPE) ? 1 : 6;
			bar = 0;
			while (bar < maxbar)
				bar += pci_ocp_init_bar(sc, bus, slot, func,
				    bar);

			/* Perform interrupt routing. */
			intpin = pci_ocp_read_config(sc->sc_dev, bus, slot,
			    func, PCIR_INTPIN, 1);
			intline = pci_ocp_route_int(sc, bus, slot, func,
			    intpin);
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_INTLINE, intline, 1);

			command |= PCIM_CMD_BUSMASTEREN | PCIM_CMD_MEMEN |
			    PCIM_CMD_PORTEN;
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_COMMAND, command, 1);

			/*
			 * Handle PCI-PCI bridges
			 */
			class = pci_ocp_read_config(sc->sc_dev, bus, slot,
			    func, PCIR_CLASS, 1);
			if (class != PCIC_BRIDGE)
				continue;
			subclass = pci_ocp_read_config(sc->sc_dev, bus, slot,
			    func, PCIR_SUBCLASS, 1);
			if (subclass != PCIS_BRIDGE_PCI)
				continue;

			secbus++;

			/* Program I/O decoder. */
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_IOBASEL_1, sc->sc_ioport.rm_start >> 8, 1);
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_IOLIMITL_1, sc->sc_ioport.rm_end >> 8, 1);
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_IOBASEH_1, sc->sc_ioport.rm_start >> 16, 2);
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_IOLIMITH_1, sc->sc_ioport.rm_end >> 16, 2);

			/* Program (non-prefetchable) memory decoder. */
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_MEMBASE_1, sc->sc_iomem.rm_start >> 16, 2);
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_MEMLIMIT_1, sc->sc_iomem.rm_end >> 16, 2);

			/* Program prefetchable memory decoder. */
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_PMBASEL_1, 0x0010, 2);
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_PMLIMITL_1, 0x000f, 2);
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_PMBASEH_1, 0x00000000, 4);
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_PMLIMITH_1, 0x00000000, 4);

			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_PRIBUS_1, bus, 1);
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_SECBUS_1, secbus, 1);
			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_SUBBUS_1, 0xff, 1);

			secbus = pci_ocp_init(sc, secbus,
			    (subclass == PCIS_BRIDGE_PCI) ? 31 : 1);

			pci_ocp_write_config(sc->sc_dev, bus, slot, func,
			    PCIR_SUBBUS_1, secbus, 1);
		}
	}

	return (secbus);
}

static void
pci_ocp_inbound(struct pci_ocp_softc *sc, int wnd, int tgt, u_long start,
    u_long size, u_long pci_start)
{
	uint32_t attr, bar, tar;

	KASSERT(wnd > 0, ("%s: inbound window 0 is invalid", __func__));

	switch (tgt) {
	case OCP85XX_TGTIF_RAM1:
		attr = 0xa0f55000 | (ffsl(size) - 2);
		break;
	default:
		attr = 0;
		break;
	}
	tar = start >> 12;
	bar = pci_start >> 12;

	bus_space_write_4(sc->sc_bst, sc->sc_bsh, REG_PITAR(wnd), tar);
	bus_space_write_4(sc->sc_bst, sc->sc_bsh, REG_PIWBEAR(wnd), 0);
	bus_space_write_4(sc->sc_bst, sc->sc_bsh, REG_PIWBAR(wnd), bar);
	bus_space_write_4(sc->sc_bst, sc->sc_bsh, REG_PIWAR(wnd), attr);
}

static void
pci_ocp_outbound(struct pci_ocp_softc *sc, int wnd, int res, u_long start,
    u_long size, u_long pci_start)
{
	uint32_t attr, bar, tar;

	switch (res) {
	case SYS_RES_MEMORY:
		attr = 0x80044000 | (ffsl(size) - 2);
		break;
	case SYS_RES_IOPORT:
		attr = 0x80088000 | (ffsl(size) - 2);
		break;
	default:
		attr = 0x0004401f;
		break;
	}
	bar = start >> 12;
	tar = pci_start >> 12;

	bus_space_write_4(sc->sc_bst, sc->sc_bsh, REG_POTAR(wnd), tar);
	bus_space_write_4(sc->sc_bst, sc->sc_bsh, REG_POTEAR(wnd), 0);
	bus_space_write_4(sc->sc_bst, sc->sc_bsh, REG_POWBAR(wnd), bar);
	bus_space_write_4(sc->sc_bst, sc->sc_bsh, REG_POWAR(wnd), attr);
}

static int
pci_ocp_iorange(struct pci_ocp_softc *sc, int type, int wnd)
{
	struct rman *rm;
	u_long start, end, size, alloc;
	bus_addr_t pci_start, pci_end;
	bus_addr_t *vap, *allocp;
	int error;

	error = bus_get_resource(sc->sc_dev, type, 1, &start, &size);
	if (error)
		return (error);

	end = start + size - 1;

	switch (type) {
	case SYS_RES_IOPORT:
		rm = &sc->sc_ioport;
		pci_start = 0x0000;
		pci_end = 0xffff;
		alloc = 0x1000;
		vap = &sc->sc_ioport_va;
		allocp = &sc->sc_ioport_alloc;
		break;
	case SYS_RES_MEMORY:
		rm = &sc->sc_iomem;
		pci_start = start;
		pci_end = end;
		alloc = 0;
		vap = &sc->sc_iomem_va;
		allocp = &sc->sc_iomem_alloc;
		break;
	default:
		return (EINVAL);
	}

	rm->rm_type = RMAN_ARRAY;
	rm->rm_start = pci_start;
	rm->rm_end = pci_end;
	error = rman_init(rm);
	if (error)
		return (error);

	error = rman_manage_region(rm, pci_start, pci_end);
	if (error) {
		rman_fini(rm);
		return (error);
	}

	*allocp = pci_start + alloc;
	*vap = (uintptr_t)pmap_mapdev(start, size);
	if (wnd != -1)
		pci_ocp_outbound(sc, wnd, type, start, size, pci_start);
	return (0);
}

static int
pci_ocp_attach(device_t dev)
{
	struct pci_ocp_softc *sc;
	uint32_t cfgreg;
	int error, maxslot;

	sc = device_get_softc(dev);
	sc->sc_dev = dev;

	sc->sc_rid = 0;
	sc->sc_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->sc_rid,
	    RF_ACTIVE);
	if (sc->sc_res == NULL) {
		device_printf(dev, "could not map I/O memory\n");
		return (ENXIO);
	}
	sc->sc_bst = rman_get_bustag(sc->sc_res);
	sc->sc_bsh = rman_get_bushandle(sc->sc_res);

	cfgreg = pci_ocp_cfgread(sc, 0, 0, 0, PCIR_COMMAND, 2);
	cfgreg |= PCIM_CMD_SERRESPEN | PCIM_CMD_BUSMASTEREN | PCIM_CMD_MEMEN |
	    PCIM_CMD_PORTEN;
	pci_ocp_cfgwrite(sc, 0, 0, 0, PCIR_COMMAND, cfgreg, 2);

	pci_ocp_outbound(sc, 0, -1, 0, 0, 0);
	error = pci_ocp_iorange(sc, SYS_RES_MEMORY, 1);
	error = pci_ocp_iorange(sc, SYS_RES_IOPORT, 2);
	pci_ocp_outbound(sc, 3, -1, 0, 0, 0);
	pci_ocp_outbound(sc, 4, -1, 0, 0, 0);

	pci_ocp_inbound(sc, 1, -1, 0, 0, 0);
	pci_ocp_inbound(sc, 2, -1, 0, 0, 0);
	pci_ocp_inbound(sc, 3, OCP85XX_TGTIF_RAM1, 0, 2U*1024U*1024U*1024U, 0);

	maxslot = (sc->sc_pcie) ? 1 : 31;
	pci_ocp_init(sc, sc->sc_busnr, maxslot);

	device_add_child(dev, "pci", -1);
	return (bus_generic_attach(dev));
}

static struct resource *
pci_ocp_alloc_resource(device_t dev, device_t child, int type, int *rid,
    u_long start, u_long end, u_long count, u_int flags)
{
	struct pci_ocp_softc *sc = device_get_softc(dev);
	struct rman *rm;
	struct resource *res;
	bus_addr_t va;

	switch (type) {
	case SYS_RES_IOPORT:
		rm = &sc->sc_ioport;
		va = sc->sc_ioport_va;
		break;
	case SYS_RES_MEMORY:
		rm = &sc->sc_iomem;
		va = sc->sc_iomem_va;
		break;
	case SYS_RES_IRQ:
		/* ISA interrupts are routed to IRQ 0 on the PIC. */
		if (start < PIC_IRQ_START) {
			device_printf(dev, "%s requested ISA interrupt %lu\n",
			    device_get_nameunit(child), start);
			/* XXX */
			start = PIC_IRQ_EXT(0);
		}
		return (BUS_ALLOC_RESOURCE(device_get_parent(dev), child,
		    type, rid, start, end, count, flags));
	default:
		return (NULL);
	}

	res = rman_reserve_resource(rm, start, end, count, flags, child);
	if (res == NULL)
		return (NULL);

	rman_set_bustag(res, &bs_le_tag);
	rman_set_bushandle(res, va + rman_get_start(res) - rm->rm_start);
	return (res);
}

static int
pci_ocp_release_resource(device_t dev, device_t child, int type, int rid,
    struct resource *res)
{

	return (rman_release_resource(res));
}

static int
pci_ocp_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
{
	struct pci_ocp_softc  *sc = device_get_softc(dev);

	switch (which) {
	case PCIB_IVAR_BUS:
		*result = sc->sc_busnr;
		return (0);
	case PCIB_IVAR_DOMAIN:
		*result = device_get_unit(dev);
		return (0);
	}
	return (ENOENT);
}

static int
pci_ocp_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
{
	struct pci_ocp_softc *sc = device_get_softc(dev);

	switch (which) {
	case PCIB_IVAR_BUS:
		sc->sc_busnr = value;
		return (0);
	}
	return (ENOENT);
}