xref: /freebsd-12-stable/sys/sparc64/pci/psycho.c

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1999, 2000 Matthew R. Green
 * Copyright (c) 2001 - 2003 by Thomas Moestl <tmm@FreeBSD.org>
 * Copyright (c) 2005 - 2006 Marius Strobl <marius@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.
 * 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.
 *
 *	from: NetBSD: psycho.c,v 1.39 2001/10/07 20:30:41 eeh Exp
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: stable/12/sys/sparc64/pci/psycho.c 331299 2018-03-21 14:47:17Z imp $");

/*
 * Support for `Hummingbird' (UltraSPARC IIe), `Psycho' and `Psycho+'
 * (UltraSPARC II) and `Sabre' (UltraSPARC IIi) UPA to PCI bridges.
 */

#include "opt_ofw_pci.h"
#include "opt_psycho.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/pcpu.h>
#include <sys/reboot.h>
#include <sys/rman.h>
#include <sys/sysctl.h>

#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/openfirm.h>

#include <machine/bus.h>
#include <machine/bus_common.h>
#include <machine/bus_private.h>
#include <machine/iommureg.h>
#include <machine/iommuvar.h>
#include <machine/resource.h>
#include <machine/ver.h>

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

#include <sparc64/pci/ofw_pci.h>
#include <sparc64/pci/psychoreg.h>
#include <sparc64/pci/psychovar.h>

#include "pcib_if.h"

static const struct psycho_desc *psycho_find_desc(const struct psycho_desc *,
    const char *);
static const struct psycho_desc *psycho_get_desc(device_t);
static void psycho_set_intr(struct psycho_softc *, u_int, bus_addr_t,
    driver_filter_t, driver_intr_t);
static int psycho_find_intrmap(struct psycho_softc *, u_int, bus_addr_t *,
    bus_addr_t *, u_long *);
static void sabre_dmamap_sync(bus_dma_tag_t dt, bus_dmamap_t map,
    bus_dmasync_op_t op);
static void psycho_intr_enable(void *);
static void psycho_intr_disable(void *);
static void psycho_intr_assign(void *);
static void psycho_intr_clear(void *);

/* Interrupt handlers */
static driver_filter_t psycho_ue;
static driver_filter_t psycho_ce;
static driver_filter_t psycho_pci_bus;
static driver_filter_t psycho_powerdebug;
static driver_intr_t psycho_powerdown;
static driver_intr_t psycho_overtemp;
#ifdef PSYCHO_MAP_WAKEUP
static driver_filter_t psycho_wakeup;
#endif

/* IOMMU support */
static void psycho_iommu_init(struct psycho_softc *, int, uint32_t);

/*
 * Methods
 */
static device_probe_t psycho_probe;
static device_attach_t psycho_attach;
static bus_setup_intr_t psycho_setup_intr;
static bus_alloc_resource_t psycho_alloc_resource;
static pcib_maxslots_t psycho_maxslots;
static pcib_read_config_t psycho_read_config;
static pcib_write_config_t psycho_write_config;
static pcib_route_interrupt_t psycho_route_interrupt;
static ofw_pci_setup_device_t psycho_setup_device;

static device_method_t psycho_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		psycho_probe),
	DEVMETHOD(device_attach,	psycho_attach),
	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
	DEVMETHOD(device_suspend,	bus_generic_suspend),
	DEVMETHOD(device_resume,	bus_generic_resume),

	/* Bus interface */
	DEVMETHOD(bus_read_ivar,	ofw_pci_read_ivar),
	DEVMETHOD(bus_setup_intr,	psycho_setup_intr),
	DEVMETHOD(bus_teardown_intr,	bus_generic_teardown_intr),
	DEVMETHOD(bus_alloc_resource,	psycho_alloc_resource),
	DEVMETHOD(bus_activate_resource, ofw_pci_activate_resource),
	DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
	DEVMETHOD(bus_adjust_resource,	ofw_pci_adjust_resource),
	DEVMETHOD(bus_release_resource,	bus_generic_release_resource),
	DEVMETHOD(bus_get_dma_tag,	ofw_pci_get_dma_tag),

	/* pcib interface */
	DEVMETHOD(pcib_maxslots,	psycho_maxslots),
	DEVMETHOD(pcib_read_config,	psycho_read_config),
	DEVMETHOD(pcib_write_config,	psycho_write_config),
	DEVMETHOD(pcib_route_interrupt,	psycho_route_interrupt),
	DEVMETHOD(pcib_request_feature,	pcib_request_feature_allow),

	/* ofw_bus interface */
	DEVMETHOD(ofw_bus_get_node,	ofw_pci_get_node),

	/* ofw_pci interface */
	DEVMETHOD(ofw_pci_setup_device,	psycho_setup_device),

	DEVMETHOD_END
};

static devclass_t psycho_devclass;

DEFINE_CLASS_0(pcib, psycho_driver, psycho_methods,
    sizeof(struct psycho_softc));
EARLY_DRIVER_MODULE(psycho, nexus, psycho_driver, psycho_devclass, NULL, NULL,
    BUS_PASS_BUS);

static SYSCTL_NODE(_hw, OID_AUTO, psycho, CTLFLAG_RD, 0, "psycho parameters");

static u_int psycho_powerfail = 1;
SYSCTL_UINT(_hw_psycho, OID_AUTO, powerfail, CTLFLAG_RDTUN, &psycho_powerfail,
    0, "powerfail action (0: none, 1: shutdown (default), 2: debugger)");

static SLIST_HEAD(, psycho_softc) psycho_softcs =
    SLIST_HEAD_INITIALIZER(psycho_softcs);

static const struct intr_controller psycho_ic = {
	psycho_intr_enable,
	psycho_intr_disable,
	psycho_intr_assign,
	psycho_intr_clear
};

struct psycho_icarg {
	struct psycho_softc	*pica_sc;
	bus_addr_t		pica_map;
	bus_addr_t		pica_clr;
};

#define	PSYCHO_READ8(sc, off)						\
	bus_read_8((sc)->sc_mem_res, (off))
#define	PSYCHO_WRITE8(sc, off, v)					\
	bus_write_8((sc)->sc_mem_res, (off), (v))
#define	PCICTL_READ8(sc, off)						\
	PSYCHO_READ8((sc), (sc)->sc_pcictl + (off))
#define	PCICTL_WRITE8(sc, off, v)					\
	PSYCHO_WRITE8((sc), (sc)->sc_pcictl + (off), (v))

/*
 * "Sabre" is the UltraSPARC IIi onboard UPA to PCI bridge.  It manages a
 * single PCI bus and does not have a streaming buffer.  It often has an APB
 * (advanced PCI bridge) connected to it, which was designed specifically for
 * the IIi.  The APB lets the IIi handle two independent PCI buses, and
 * appears as two "Simba"'s underneath the Sabre.
 *
 * "Hummingbird" is the UltraSPARC IIe onboard UPA to PCI bridge. It's
 * basically the same as Sabre but without an APB underneath it.
 *
 * "Psycho" and "Psycho+" are dual UPA to PCI bridges.  They sit on the UPA
 * bus and manage two PCI buses.  "Psycho" has two 64-bit 33MHz buses, while
 * "Psycho+" controls both a 64-bit 33Mhz and a 64-bit 66Mhz PCI bus.  You
 * will usually find a "Psycho+" since I don't think the original "Psycho"
 * ever shipped, and if it did it would be in the U30.
 *
 * Each "Psycho" PCI bus appears as a separate OFW node, but since they are
 * both part of the same IC, they only have a single register space.  As such,
 * they need to be configured together, even though the autoconfiguration will
 * attach them separately.
 *
 * On UltraIIi machines, "Sabre" itself usually takes pci0, with "Simba" often
 * as pci1 and pci2, although they have been implemented with other PCI bus
 * numbers on some machines.
 *
 * On UltraII machines, there can be any number of "Psycho+" ICs, each
 * providing two PCI buses.
 */

struct psycho_desc {
	const char	*pd_string;
	int		pd_mode;
	const char	*pd_name;
};

static const struct psycho_desc psycho_compats[] = {
	{ "pci108e,8000", PSYCHO_MODE_PSYCHO,	"Psycho compatible" },
	{ "pci108e,a000", PSYCHO_MODE_SABRE,	"Sabre compatible" },
	{ "pci108e,a001", PSYCHO_MODE_SABRE,	"Hummingbird compatible" },
	{ NULL,		  0,			NULL }
};

static const struct psycho_desc psycho_models[] = {
	{ "SUNW,psycho",  PSYCHO_MODE_PSYCHO,	"Psycho" },
	{ "SUNW,sabre",   PSYCHO_MODE_SABRE,	"Sabre" },
	{ NULL,		  0,			NULL }
};

static const struct psycho_desc *
psycho_find_desc(const struct psycho_desc *table, const char *string)
{
	const struct psycho_desc *desc;

	if (string == NULL)
		return (NULL);
	for (desc = table; desc->pd_string != NULL; desc++)
		if (strcmp(desc->pd_string, string) == 0)
			return (desc);
	return (NULL);
}

static const struct psycho_desc *
psycho_get_desc(device_t dev)
{
	const struct psycho_desc *rv;

	rv = psycho_find_desc(psycho_models, ofw_bus_get_model(dev));
	if (rv == NULL)
		rv = psycho_find_desc(psycho_compats,
		    ofw_bus_get_compat(dev));
	return (rv);
}

static int
psycho_probe(device_t dev)
{
	const char *dtype;

	dtype = ofw_bus_get_type(dev);
	if (dtype != NULL && strcmp(dtype, OFW_TYPE_PCI) == 0 &&
	    psycho_get_desc(dev) != NULL) {
		device_set_desc(dev, "U2P UPA-PCI bridge");
		return (0);
	}
	return (ENXIO);
}

static int
psycho_attach(device_t dev)
{
	struct psycho_icarg *pica;
	struct psycho_softc *asc, *sc, *osc;
	const struct psycho_desc *desc;
	bus_addr_t intrclr, intrmap;
	bus_dma_tag_t dmat;
	uint64_t csr, dr;
	phandle_t node;
	uint32_t dvmabase, prop;
	u_int rerun, ver;
	int i, j;

	node = ofw_bus_get_node(dev);
	sc = device_get_softc(dev);
	desc = psycho_get_desc(dev);

	sc->sc_dev = dev;
	sc->sc_mode = desc->pd_mode;

	/*
	 * The Psycho gets three register banks:
	 * (0) per-PBM configuration and status registers
	 * (1) per-PBM PCI configuration space, containing only the
	 *     PBM 256-byte PCI header
	 * (2) the shared Psycho configuration registers
	 */
	if (sc->sc_mode == PSYCHO_MODE_PSYCHO) {
		i = 2;
		sc->sc_pcictl =
		    bus_get_resource_start(dev, SYS_RES_MEMORY, 0) -
		    bus_get_resource_start(dev, SYS_RES_MEMORY, 2);
		switch (sc->sc_pcictl) {
		case PSR_PCICTL0:
			sc->sc_half = 0;
			break;
		case PSR_PCICTL1:
			sc->sc_half = 1;
			break;
		default:
			panic("%s: bogus PCI control register location",
			    __func__);
			/* NOTREACHED */
		}
	} else {
		i = 0;
		sc->sc_pcictl = PSR_PCICTL0;
		sc->sc_half = 0;
	}
	sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &i,
	    (sc->sc_mode == PSYCHO_MODE_PSYCHO ? RF_SHAREABLE : 0) |
	    RF_ACTIVE);
	if (sc->sc_mem_res == NULL)
		panic("%s: could not allocate registers", __func__);

	/*
	 * Match other Psychos that are already configured against
	 * the base physical address.  This will be the same for a
	 * pair of devices that share register space.
	 */
	osc = NULL;
	SLIST_FOREACH(asc, &psycho_softcs, sc_link) {
		if (rman_get_start(asc->sc_mem_res) ==
		    rman_get_start(sc->sc_mem_res)) {
			/* Found partner. */
			osc = asc;
			break;
		}
	}
	if (osc == NULL) {
		sc->sc_mtx = malloc(sizeof(*sc->sc_mtx), M_DEVBUF,
		    M_NOWAIT | M_ZERO);
		if (sc->sc_mtx == NULL)
			panic("%s: could not malloc mutex", __func__);
		mtx_init(sc->sc_mtx, "pcib_mtx", NULL, MTX_SPIN);
	} else {
		if (sc->sc_mode != PSYCHO_MODE_PSYCHO)
			panic("%s: no partner expected", __func__);
		if (mtx_initialized(osc->sc_mtx) == 0)
			panic("%s: mutex not initialized", __func__);
		sc->sc_mtx = osc->sc_mtx;
	}
	SLIST_INSERT_HEAD(&psycho_softcs, sc, sc_link);

	csr = PSYCHO_READ8(sc, PSR_CS);
	ver = PSYCHO_GCSR_VERS(csr);
	sc->sc_ign = 0x1f; /* Hummingbird/Sabre IGN is always 0x1f. */
	if (sc->sc_mode == PSYCHO_MODE_PSYCHO)
		sc->sc_ign = PSYCHO_GCSR_IGN(csr);
	if (OF_getprop(node, "clock-frequency", &prop, sizeof(prop)) == -1)
		prop = 33000000;

	device_printf(dev,
	    "%s, impl %d, version %d, IGN %#x, bus %c, %dMHz\n",
	    desc->pd_name, (u_int)PSYCHO_GCSR_IMPL(csr), ver, sc->sc_ign,
	    'A' + sc->sc_half, prop / 1000 / 1000);

	/* Set up the PCI control and PCI diagnostic registers. */

	csr = PCICTL_READ8(sc, PCR_CS);
	csr &= ~PCICTL_ARB_PARK;
	if (OF_getproplen(node, "no-bus-parking") < 0)
		csr |= PCICTL_ARB_PARK;

	/* Workarounds for version specific bugs. */
	dr = PCICTL_READ8(sc, PCR_DIAG);
	switch (ver) {
	case 0:
		dr |= DIAG_RTRY_DIS;
		dr &= ~DIAG_DWSYNC_DIS;
		rerun = 0;
		break;
	case 1:
		csr &= ~PCICTL_ARB_PARK;
		dr |= DIAG_RTRY_DIS | DIAG_DWSYNC_DIS;
		rerun = 0;
		break;
	default:
		dr |= DIAG_DWSYNC_DIS;
		dr &= ~DIAG_RTRY_DIS;
		rerun = 1;
		break;
	}

	csr |= PCICTL_ERRINTEN | PCICTL_ARB_4;
	csr &= ~(PCICTL_SBHINTEN | PCICTL_WAKEUPEN);
#ifdef PSYCHO_DEBUG
	device_printf(dev, "PCI CSR 0x%016llx -> 0x%016llx\n",
	    (unsigned long long)PCICTL_READ8(sc, PCR_CS),
	    (unsigned long long)csr);
#endif
	PCICTL_WRITE8(sc, PCR_CS, csr);

	dr &= ~DIAG_ISYNC_DIS;
#ifdef PSYCHO_DEBUG
	device_printf(dev, "PCI DR 0x%016llx -> 0x%016llx\n",
	    (unsigned long long)PCICTL_READ8(sc, PCR_DIAG),
	    (unsigned long long)dr);
#endif
	PCICTL_WRITE8(sc, PCR_DIAG, dr);

	if (sc->sc_mode == PSYCHO_MODE_SABRE) {
		/* Use the PROM preset for now. */
		csr = PCICTL_READ8(sc, PCR_TAS);
		if (csr == 0)
			panic("%s: Hummingbird/Sabre TAS not initialized.",
			    __func__);
		dvmabase = (ffs(csr) - 1) << PCITAS_ADDR_SHIFT;
	} else
		dvmabase = -1;

	/*
	 * If we're a Hummingbird/Sabre or the first of a pair of Psychos
	 * to arrive here, do the interrupt setup and start up the IOMMU.
	 */
	if (osc == NULL) {
		/*
		 * Hunt through all the interrupt mapping regs and register
		 * our interrupt controller for the corresponding interrupt
		 * vectors.  We do this early in order to be able to catch
		 * stray interrupts.
		 */
		for (i = 0; i <= PSYCHO_MAX_INO; i++) {
			if (psycho_find_intrmap(sc, i, &intrmap, &intrclr,
			    NULL) == 0)
				continue;
			pica = malloc(sizeof(*pica), M_DEVBUF, M_NOWAIT);
			if (pica == NULL)
				panic("%s: could not allocate interrupt "
				    "controller argument", __func__);
			pica->pica_sc = sc;
			pica->pica_map = intrmap;
			pica->pica_clr = intrclr;
#ifdef PSYCHO_DEBUG
			/*
			 * Enable all interrupts and clear all interrupt
			 * states.  This aids the debugging of interrupt
			 * routing problems.
			 */
			device_printf(dev,
			    "intr map (INO %d, %s) %#lx: %#lx, clr: %#lx\n",
			    i, intrmap <= PSR_PCIB3_INT_MAP ? "PCI" : "OBIO",
			    (u_long)intrmap, (u_long)PSYCHO_READ8(sc,
			    intrmap), (u_long)intrclr);
			PSYCHO_WRITE8(sc, intrmap, INTMAP_VEC(sc->sc_ign, i));
			PSYCHO_WRITE8(sc, intrclr, INTCLR_IDLE);
			PSYCHO_WRITE8(sc, intrmap,
			    INTMAP_ENABLE(INTMAP_VEC(sc->sc_ign, i),
			    PCPU_GET(mid)));
#endif
			j = intr_controller_register(INTMAP_VEC(sc->sc_ign,
			    i), &psycho_ic, pica);
			if (j != 0)
				device_printf(dev, "could not register "
				    "interrupt controller for INO %d (%d)\n",
				    i, j);
		}

		if (sc->sc_mode == PSYCHO_MODE_PSYCHO)
			sparc64_counter_init(device_get_nameunit(dev),
			    rman_get_bustag(sc->sc_mem_res),
			    rman_get_bushandle(sc->sc_mem_res), PSR_TC0);

		/*
		 * Set up IOMMU and PCI configuration if we're the first
		 * of a pair of Psychos to arrive here or a Hummingbird
		 * or Sabre.
		 *
		 * We should calculate a TSB size based on amount of RAM
		 * and number of bus controllers and number and type of
		 * child devices.
		 *
		 * For the moment, 32KB should be more than enough.
		 */
		sc->sc_is = malloc(sizeof(*sc->sc_is), M_DEVBUF, M_NOWAIT |
		    M_ZERO);
		if (sc->sc_is == NULL)
			panic("%s: could not malloc IOMMU state", __func__);
		sc->sc_is->is_flags = IOMMU_PRESERVE_PROM;
		if (sc->sc_mode == PSYCHO_MODE_SABRE) {
			sc->sc_dma_methods =
			    malloc(sizeof(*sc->sc_dma_methods), M_DEVBUF,
			    M_NOWAIT);
			if (sc->sc_dma_methods == NULL)
				panic("%s: could not malloc DMA methods",
				    __func__);
			memcpy(sc->sc_dma_methods, &iommu_dma_methods,
			    sizeof(*sc->sc_dma_methods));
			sc->sc_dma_methods->dm_dmamap_sync =
			    sabre_dmamap_sync;
			sc->sc_is->is_pmaxaddr =
			    IOMMU_MAXADDR(SABRE_IOMMU_BITS);
		} else {
			sc->sc_dma_methods = &iommu_dma_methods;
			sc->sc_is->is_pmaxaddr =
			    IOMMU_MAXADDR(PSYCHO_IOMMU_BITS);
		}
		sc->sc_is->is_sb[0] = sc->sc_is->is_sb[1] = 0;
		if (OF_getproplen(node, "no-streaming-cache") < 0)
			sc->sc_is->is_sb[0] = sc->sc_pcictl + PCR_STRBUF;
		sc->sc_is->is_flags |= (rerun != 1) ? IOMMU_RERUN_DISABLE : 0;
		psycho_iommu_init(sc, 3, dvmabase);
	} else {
		/* Just copy IOMMU state, config tag and address. */
		sc->sc_dma_methods = &iommu_dma_methods;
		sc->sc_is = osc->sc_is;
		if (OF_getproplen(node, "no-streaming-cache") < 0)
			sc->sc_is->is_sb[1] = sc->sc_pcictl + PCR_STRBUF;
		iommu_reset(sc->sc_is);
	}

	/* Create our DMA tag. */
	if (bus_dma_tag_create(bus_get_dma_tag(dev), 8, 0,
	    sc->sc_is->is_pmaxaddr, ~0, NULL, NULL, sc->sc_is->is_pmaxaddr,
	    0xff, 0xffffffff, 0, NULL, NULL, &dmat) != 0)
		panic("%s: could not create PCI DMA tag", __func__);
	dmat->dt_cookie = sc->sc_is;
	dmat->dt_mt = sc->sc_dma_methods;

	if (ofw_pci_attach_common(dev, dmat, PSYCHO_IO_SIZE,
	    PSYCHO_MEM_SIZE) != 0)
		panic("%s: ofw_pci_attach_common() failed", __func__);

	/* Clear any pending PCI error bits. */
	PCIB_WRITE_CONFIG(dev, sc->sc_ops.sc_pci_secbus, PCS_DEVICE, PCS_FUNC,
	    PCIR_STATUS, PCIB_READ_CONFIG(dev, sc->sc_ops.sc_pci_secbus,
	    PCS_DEVICE, PCS_FUNC, PCIR_STATUS, 2), 2);
	PCICTL_WRITE8(sc, PCR_CS, PCICTL_READ8(sc, PCR_CS));
	PCICTL_WRITE8(sc, PCR_AFS, PCICTL_READ8(sc, PCR_AFS));

	if (osc == NULL) {
		/*
		 * Establish handlers for interesting interrupts...
		 *
		 * XXX We need to remember these and remove this to support
		 * hotplug on the UPA/FHC bus.
		 *
		 * XXX Not all controllers have these, but installing them
		 * is better than trying to sort through this mess.
		 */
		psycho_set_intr(sc, 1, PSR_UE_INT_MAP, psycho_ue, NULL);
		psycho_set_intr(sc, 2, PSR_CE_INT_MAP, psycho_ce, NULL);
		switch (psycho_powerfail) {
		case 0:
			break;
		case 2:
			psycho_set_intr(sc, 3, PSR_POWER_INT_MAP,
			    psycho_powerdebug, NULL);
			break;
		default:
			psycho_set_intr(sc, 3, PSR_POWER_INT_MAP, NULL,
			    psycho_powerdown);
			break;
		}
		if (sc->sc_mode == PSYCHO_MODE_PSYCHO) {
			/*
			 * Hummingbirds/Sabres do not have the following two
			 * interrupts.
			 */

			/*
			 * The spare hardware interrupt is used for the
			 * over-temperature interrupt.
			 */
			psycho_set_intr(sc, 4, PSR_SPARE_INT_MAP, NULL,
			    psycho_overtemp);
#ifdef PSYCHO_MAP_WAKEUP
			/*
			 * psycho_wakeup() doesn't do anything useful right
			 * now.
			 */
			psycho_set_intr(sc, 5, PSR_PWRMGT_INT_MAP,
			    psycho_wakeup, NULL);
#endif /* PSYCHO_MAP_WAKEUP */
		}
	}
	/*
	 * Register a PCI bus error interrupt handler according to which
	 * half this is.  Hummingbird/Sabre don't have a PCI bus B error
	 * interrupt but they are also only used for PCI bus A.
	 */
	psycho_set_intr(sc, 0, sc->sc_half == 0 ? PSR_PCIAERR_INT_MAP :
	    PSR_PCIBERR_INT_MAP, psycho_pci_bus, NULL);

	/*
	 * Set the latency timer register as this isn't always done by the
	 * firmware.
	 */
	PCIB_WRITE_CONFIG(dev, sc->sc_ops.sc_pci_secbus, PCS_DEVICE, PCS_FUNC,
	    PCIR_LATTIMER, OFW_PCI_LATENCY, 1);

	for (i = PCIR_VENDOR; i < PCIR_STATUS; i += sizeof(uint16_t))
		le16enc(&sc->sc_pci_hpbcfg[i],
		    bus_space_read_2(sc->sc_ops.sc_pci_cfgt,
		    sc->sc_ops.sc_pci_bh[OFW_PCI_CS_CONFIG],
		    PSYCHO_CONF_OFF(sc->sc_ops.sc_pci_secbus, PCS_DEVICE,
		    PCS_FUNC, i)));
	for (i = PCIR_REVID; i <= PCIR_BIST; i += sizeof(uint8_t))
		sc->sc_pci_hpbcfg[i] = bus_space_read_1(sc->sc_ops.sc_pci_cfgt,
		    sc->sc_ops.sc_pci_bh[OFW_PCI_CS_CONFIG], PSYCHO_CONF_OFF(
		    sc->sc_ops.sc_pci_secbus, PCS_DEVICE, PCS_FUNC, i));

	/*
	 * On E250 the interrupt map entry for the EBus bridge is wrong,
	 * causing incorrect interrupts to be assigned to some devices on
	 * the EBus.  Work around it by changing our copy of the interrupt
	 * map mask to perform a full comparison of the INO.  That way
	 * the interrupt map entry for the EBus bridge won't match at all
	 * and the INOs specified in the "interrupts" properties of the
	 * EBus devices will be used directly instead.
	 */
	if (strcmp(sparc64_model, "SUNW,Ultra-250") == 0 &&
	    sc->sc_ops.sc_pci_iinfo.opi_imapmsk != NULL)
		*(ofw_pci_intr_t *)(&sc->sc_ops.sc_pci_iinfo.opi_imapmsk[
		    sc->sc_ops.sc_pci_iinfo.opi_addrc]) = INTMAP_INO_MASK;

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

static void
psycho_set_intr(struct psycho_softc *sc, u_int index, bus_addr_t intrmap,
    driver_filter_t filt, driver_intr_t intr)
{
	u_long vec;
	int rid;

	rid = index;
	sc->sc_irq_res[index] = bus_alloc_resource_any(sc->sc_dev,
	    SYS_RES_IRQ, &rid, RF_ACTIVE);
	if (sc->sc_irq_res[index] == NULL && intrmap >= PSR_POWER_INT_MAP) {
		/*
		 * These interrupts aren't mandatory and not available
		 * with all controllers (not even Psychos).
		 */
		return;
	}
	if (sc->sc_irq_res[index] == NULL ||
	    INTIGN(vec = rman_get_start(sc->sc_irq_res[index])) !=
	    sc->sc_ign ||
	    INTVEC(PSYCHO_READ8(sc, intrmap)) != vec ||
	    intr_vectors[vec].iv_ic != &psycho_ic ||
	    bus_setup_intr(sc->sc_dev, sc->sc_irq_res[index],
	    INTR_TYPE_MISC | INTR_BRIDGE | INTR_MPSAFE, filt, intr, sc,
	    &sc->sc_ihand[index]) != 0)
		panic("%s: failed to set up interrupt %d", __func__, index);
}

static int
psycho_find_intrmap(struct psycho_softc *sc, u_int ino,
    bus_addr_t *intrmapptr, bus_addr_t *intrclrptr, bus_addr_t *intrdiagptr)
{
	bus_addr_t intrclr, intrmap;
	uint64_t diag;
	int found;

	/*
	 * XXX we only compare INOs rather than INRs since the firmware may
	 * not provide the IGN and the IGN is constant for all devices on
	 * that PCI controller.
	 * This could cause problems for the FFB/external interrupt which
	 * has a full vector that can be set arbitrarily.
	 */

	if (ino > PSYCHO_MAX_INO) {
		device_printf(sc->sc_dev, "out of range INO %d requested\n",
		    ino);
		return (0);
	}

	found = 0;
	/* Hunt through OBIO first. */
	diag = PSYCHO_READ8(sc, PSR_OBIO_INT_DIAG);
	for (intrmap = PSR_SCSI_INT_MAP, intrclr = PSR_SCSI_INT_CLR;
	    intrmap <= PSR_PWRMGT_INT_MAP; intrmap += 8, intrclr += 8,
	    diag >>= 2) {
		if (sc->sc_mode == PSYCHO_MODE_SABRE &&
		    (intrmap == PSR_TIMER0_INT_MAP ||
		    intrmap == PSR_TIMER1_INT_MAP ||
		    intrmap == PSR_PCIBERR_INT_MAP ||
		    intrmap == PSR_PWRMGT_INT_MAP))
			continue;
		if (INTINO(PSYCHO_READ8(sc, intrmap)) == ino) {
			diag &= 2;
			found = 1;
			break;
		}
	}

	if (!found) {
		diag = PSYCHO_READ8(sc, PSR_PCI_INT_DIAG);
		/* Now do PCI interrupts. */
		for (intrmap = PSR_PCIA0_INT_MAP, intrclr = PSR_PCIA0_INT_CLR;
		    intrmap <= PSR_PCIB3_INT_MAP; intrmap += 8, intrclr += 32,
		    diag >>= 8) {
			if (sc->sc_mode == PSYCHO_MODE_PSYCHO &&
			    (intrmap == PSR_PCIA2_INT_MAP ||
			    intrmap == PSR_PCIA3_INT_MAP))
				continue;
			if (((PSYCHO_READ8(sc, intrmap) ^ ino) & 0x3c) == 0) {
				intrclr += 8 * (ino & 3);
				diag = (diag >> ((ino & 3) * 2)) & 2;
				found = 1;
				break;
			}
		}
	}
	if (intrmapptr != NULL)
		*intrmapptr = intrmap;
	if (intrclrptr != NULL)
		*intrclrptr = intrclr;
	if (intrdiagptr != NULL)
		*intrdiagptr = diag;
	return (found);
}

/*
 * Interrupt handlers
 */
static int
psycho_ue(void *arg)
{
	struct psycho_softc *sc = arg;
	uint64_t afar, afsr;

	afar = PSYCHO_READ8(sc, PSR_UE_AFA);
	afsr = PSYCHO_READ8(sc, PSR_UE_AFS);
	/*
	 * On the UltraSPARC-IIi/IIe, IOMMU misses/protection faults cause
	 * the AFAR to be set to the physical address of the TTE entry that
	 * was invalid/write protected.  Call into the IOMMU code to have
	 * them decoded to virtual I/O addresses.
	 */
	if ((afsr & UEAFSR_P_DTE) != 0)
		iommu_decode_fault(sc->sc_is, afar);
	panic("%s: uncorrectable DMA error AFAR %#lx AFSR %#lx",
	    device_get_nameunit(sc->sc_dev), (u_long)afar, (u_long)afsr);
	return (FILTER_HANDLED);
}

static int
psycho_ce(void *arg)
{
	struct psycho_softc *sc = arg;
	uint64_t afar, afsr;

	mtx_lock_spin(sc->sc_mtx);
	afar = PSYCHO_READ8(sc, PSR_CE_AFA);
	afsr = PSYCHO_READ8(sc, PSR_CE_AFS);
	device_printf(sc->sc_dev, "correctable DMA error AFAR %#lx "
	    "AFSR %#lx\n", (u_long)afar, (u_long)afsr);
	/* Clear the error bits that we caught. */
	PSYCHO_WRITE8(sc, PSR_CE_AFS, afsr);
	mtx_unlock_spin(sc->sc_mtx);
	return (FILTER_HANDLED);
}

static int
psycho_pci_bus(void *arg)
{
	struct psycho_softc *sc = arg;
	uint64_t afar, afsr;

	afar = PCICTL_READ8(sc, PCR_AFA);
	afsr = PCICTL_READ8(sc, PCR_AFS);
	panic("%s: PCI bus %c error AFAR %#lx AFSR %#lx",
	    device_get_nameunit(sc->sc_dev), 'A' + sc->sc_half, (u_long)afar,
	    (u_long)afsr);
	return (FILTER_HANDLED);
}

static int
psycho_powerdebug(void *arg __unused)
{

	kdb_enter(KDB_WHY_POWERFAIL, "powerfail");
	return (FILTER_HANDLED);
}

static void
psycho_powerdown(void *arg __unused)
{
	static int shutdown;

	/* As the interrupt is cleared we may be called multiple times. */
	if (shutdown != 0)
		return;
	shutdown++;
	printf("Power Failure Detected: Shutting down NOW.\n");
	shutdown_nice(RB_POWEROFF);
}

static void
psycho_overtemp(void *arg __unused)
{
	static int shutdown;

	/* As the interrupt is cleared we may be called multiple times. */
	if (shutdown != 0)
		return;
	shutdown++;
	printf("DANGER: OVER TEMPERATURE detected.\nShutting down NOW.\n");
	shutdown_nice(RB_POWEROFF);
}

#ifdef PSYCHO_MAP_WAKEUP
static int
psycho_wakeup(void *arg)
{
	struct psycho_softc *sc = arg;

	/* We don't really have a framework to deal with this properly. */
	device_printf(sc->sc_dev, "power management wakeup\n");
	return (FILTER_HANDLED);
}
#endif /* PSYCHO_MAP_WAKEUP */

static void
psycho_iommu_init(struct psycho_softc *sc, int tsbsize, uint32_t dvmabase)
{
	struct iommu_state *is = sc->sc_is;

	/* Punch in our copies. */
	is->is_bustag = rman_get_bustag(sc->sc_mem_res);
	is->is_bushandle = rman_get_bushandle(sc->sc_mem_res);
	is->is_iommu = PSR_IOMMU;
	is->is_dtag = PSR_IOMMU_TLB_TAG_DIAG;
	is->is_ddram = PSR_IOMMU_TLB_DATA_DIAG;
	is->is_dqueue = PSR_IOMMU_QUEUE_DIAG;
	is->is_dva = PSR_IOMMU_SVADIAG;
	is->is_dtcmp = PSR_IOMMU_TLB_CMP_DIAG;

	iommu_init(device_get_nameunit(sc->sc_dev), is, tsbsize, dvmabase, 0);
}

static int
psycho_maxslots(device_t dev)
{

	/* XXX: is this correct? */
	return (PCI_SLOTMAX);
}

static uint32_t
psycho_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg,
    int width)
{
	struct psycho_softc *sc;

	sc = device_get_softc(dev);
	/*
	 * The Hummingbird and Sabre bridges are picky in that they
	 * only allow their config space to be accessed using the
	 * "native" width of the respective register being accessed
	 * and return semi-random other content of their config space
	 * otherwise.  Given that the PCI specs don't say anything
	 * about such a (unusual) limitation and lots of stuff expects
	 * to be able to access the contents of the config space at
	 * any width we allow just that.  We do this by using a copy
	 * of the header of the bridge (the rest is all zero anyway)
	 * read during attach (expect for PCIR_STATUS) in order to
	 * simplify things.
	 * The Psycho bridges contain a dupe of their header at 0x80
	 * which we nullify that way also.
	 */
	if (bus == sc->sc_ops.sc_pci_secbus && slot == PCS_DEVICE &&
	    func == PCS_FUNC) {
		if (reg % width != 0)
			return (-1);

		if (reg >= sizeof(sc->sc_pci_hpbcfg))
			return (0);

		if ((reg < PCIR_STATUS && reg + width > PCIR_STATUS) ||
		    reg == PCIR_STATUS || reg == PCIR_STATUS + 1)
			le16enc(&sc->sc_pci_hpbcfg[PCIR_STATUS],
			    bus_space_read_2(sc->sc_ops.sc_pci_cfgt,
			    sc->sc_ops.sc_pci_bh[OFW_PCI_CS_CONFIG],
			    PSYCHO_CONF_OFF(sc->sc_ops.sc_pci_secbus,
			    PCS_DEVICE, PCS_FUNC, PCIR_STATUS)));

		switch (width) {
		case 1:
			return (sc->sc_pci_hpbcfg[reg]);
		case 2:
			return (le16dec(&sc->sc_pci_hpbcfg[reg]));
		case 4:
			return (le32dec(&sc->sc_pci_hpbcfg[reg]));
		}
	}

	return (ofw_pci_read_config_common(dev, PCI_REGMAX,
	    PSYCHO_CONF_OFF(bus, slot, func, reg), bus, slot, func, reg,
	    width));
}

static void
psycho_write_config(device_t dev, u_int bus, u_int slot, u_int func,
    u_int reg, uint32_t val, int width)
{

	ofw_pci_write_config_common(dev, PCI_REGMAX, PSYCHO_CONF_OFF(bus,
	    slot, func, reg), bus, slot, func, reg, val, width);
}

static int
psycho_route_interrupt(device_t bridge, device_t dev, int pin)
{
	struct psycho_softc *sc;
	bus_addr_t intrmap;
	ofw_pci_intr_t mintr;

	mintr = ofw_pci_route_interrupt_common(bridge, dev, pin);
	if (PCI_INTERRUPT_VALID(mintr))
		return (mintr);
	/*
	 * If this is outside of the range for an intpin, it's likely a full
	 * INO, and no mapping is required at all; this happens on the U30,
	 * where there's no interrupt map at the Psycho node.  Fortunately,
	 * there seem to be no INOs in the intpin range on this boxen, so
	 * this easy heuristics will do.
	 */
	if (pin > 4)
		return (pin);
	/*
	 * Guess the INO; we always assume that this is a non-OBIO device,
	 * and that pin is a "real" intpin number.  Determine the mapping
	 * register to be used by the slot number.
	 * We only need to do this on E450s and U30s, though; here, the
	 * slot numbers for bus A are one-based, while those for bus B
	 * seemingly have an offset of 2 (hence the factor of 3 below).
	 */
	sc = device_get_softc(bridge);
	intrmap = PSR_PCIA0_INT_MAP +
	    8 * (pci_get_slot(dev) - 1 + 3 * sc->sc_half);
	mintr = INTINO(PSYCHO_READ8(sc, intrmap)) + pin - 1;
	device_printf(bridge,
	    "guessing interrupt %d for device %d.%d pin %d\n",
	    (int)mintr, pci_get_slot(dev), pci_get_function(dev), pin);
	return (mintr);
}

static void
sabre_dmamap_sync(bus_dma_tag_t dt, bus_dmamap_t map, bus_dmasync_op_t op)
{
	struct iommu_state *is = dt->dt_cookie;

	if ((map->dm_flags & DMF_LOADED) == 0)
		return;

	if ((op & BUS_DMASYNC_POSTREAD) != 0)
		(void)bus_space_read_8(is->is_bustag, is->is_bushandle,
		    PSR_DMA_WRITE_SYNC);

	if ((op & BUS_DMASYNC_PREWRITE) != 0)
		membar(Sync);
}

static void
psycho_intr_enable(void *arg)
{
	struct intr_vector *iv = arg;
	struct psycho_icarg *pica = iv->iv_icarg;

	PSYCHO_WRITE8(pica->pica_sc, pica->pica_map,
	    INTMAP_ENABLE(iv->iv_vec, iv->iv_mid));
}

static void
psycho_intr_disable(void *arg)
{
	struct intr_vector *iv = arg;
	struct psycho_icarg *pica = iv->iv_icarg;

	PSYCHO_WRITE8(pica->pica_sc, pica->pica_map, iv->iv_vec);
}

static void
psycho_intr_assign(void *arg)
{
	struct intr_vector *iv = arg;
	struct psycho_icarg *pica = iv->iv_icarg;

	PSYCHO_WRITE8(pica->pica_sc, pica->pica_map, INTMAP_TID(
	    PSYCHO_READ8(pica->pica_sc, pica->pica_map), iv->iv_mid));
}

static void
psycho_intr_clear(void *arg)
{
	struct intr_vector *iv = arg;
	struct psycho_icarg *pica = iv->iv_icarg;

	PSYCHO_WRITE8(pica->pica_sc, pica->pica_clr, INTCLR_IDLE);
}

static int
psycho_setup_intr(device_t dev, device_t child, struct resource *ires,
    int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg,
    void **cookiep)
{
	struct psycho_softc *sc;
	u_long vec;

	sc = device_get_softc(dev);
	/*
	 * Make sure the vector is fully specified and we registered
	 * our interrupt controller for it.
	 */
	vec = rman_get_start(ires);
	if (INTIGN(vec) != sc->sc_ign ||
	    intr_vectors[vec].iv_ic != &psycho_ic) {
		device_printf(dev, "invalid interrupt vector 0x%lx\n", vec);
		return (EINVAL);
	}
	return (bus_generic_setup_intr(dev, child, ires, flags, filt, intr,
	    arg, cookiep));
}

static struct resource *
psycho_alloc_resource(device_t bus, device_t child, int type, int *rid,
    rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
{
	struct psycho_softc *sc;

	if (type == SYS_RES_IRQ) {
		sc = device_get_softc(bus);
		start = end = INTMAP_VEC(sc->sc_ign, end);
	}
	return (ofw_pci_alloc_resource(bus, child, type, rid, start, end,
	    count, flags));
}

static void
psycho_setup_device(device_t bus, device_t child)
{
	struct psycho_softc *sc;
	uint32_t rev;

	sc = device_get_softc(bus);
	/*
	 * Revision 0 EBus bridges have a bug which prevents them from
	 * working when bus parking is enabled.
	 */
	if ((strcmp(ofw_bus_get_name(child), "ebus") == 0 ||
	    strcmp(ofw_bus_get_name(child), "pci108e,1000") == 0) &&
	    OF_getprop(ofw_bus_get_node(child), "revision-id", &rev,
	    sizeof(rev)) > 0 && rev == 0)
		PCICTL_WRITE8(sc, PCR_CS, PCICTL_READ8(sc, PCR_CS) &
		    ~PCICTL_ARB_PARK);
}