text: /*
   * $NetBSD: puc.c,v 1.7 2000/07/29 17:43:38 jlam Exp $
   * $FreeBSD: src/sys/dev/puc/puc.c,v 1.3.2.5 2003/04/04 08:42:17 sobomax Exp $
   */
  
  /*-
   * Copyright (c) 2002 JF Hay.  All rights reserved.
   * Copyright (c) 2000 M. Warner Losh.  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 unmodified, 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 ``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.
   */
  
  /*
   * Copyright (c) 1996, 1998, 1999
   *	Christopher G. Demetriou.  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. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *      This product includes software developed by Christopher G. Demetriou
   *	for the NetBSD Project.
   * 4. 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.
   */
  
  /*
   * PCI "universal" communication card device driver, glues com, lpt,
   * and similar ports to PCI via bridge chip often much larger than
   * the devices being glued.
   *
   * Author: Christopher G. Demetriou, May 14, 1998 (derived from NetBSD
   * sys/dev/pci/pciide.c, revision 1.6).
   *
   * These devices could be (and some times are) described as
   * communications/{serial,parallel}, etc. devices with known
   * programming interfaces, but those programming interfaces (in
   * particular the BAR assignments for devices, etc.) in fact are not
   * particularly well defined.
   *
   * After I/we have seen more of these devices, it may be possible
   * to generalize some of these bits.  In particular, devices which
   * describe themselves as communications/serial/16[45]50, and
   * communications/parallel/??? might be attached via direct
   * 'com' and 'lpt' attachments to pci.
   */
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/kernel.h>
  #include <sys/bus.h>
  #include <sys/conf.h>
  #include <sys/malloc.h>
  #include <sys/rman.h>
  
  #include <bus/pci/pcireg.h>
  #include <bus/pci/pcivar.h>
  #include "pucvar.h"
  
  struct puc_softc {
  	const struct puc_device_description *sc_desc;
  
  	/* card-global dynamic data */
  	int			barmuxed;
  	int			irqrid;
  	struct resource		*irqres;
  	void			*intr_cookie;
  	int			ilr_enabled;
  	bus_space_tag_t		ilr_st;
  	bus_space_handle_t	ilr_sh;
  
  	struct {
  		struct resource	*res;
  	} sc_bar_mappings[PUC_MAX_BAR];
  
  	/* per-port dynamic data */
          struct {
  		struct device	*dev;
  		/* filled in by bus_setup_intr() */
  		void		(*ihand) (void *);
  		void		*ihandarg;
          } sc_ports[PUC_MAX_PORTS];
  };
  
  struct puc_device {
  	struct resource_list resources;
  	u_int serialfreq;
  };
  
  static int puc_pci_probe(device_t dev);
  static int puc_pci_attach(device_t dev);
  static void puc_intr(void *arg);
  
  static struct resource *puc_alloc_resource(device_t, device_t, int, int *,
      u_long, u_long, u_long, u_int, int);
  static int puc_release_resource(device_t, device_t, int, int,
      struct resource *);
  static int puc_get_resource(device_t, device_t, int, int, u_long *, u_long *);
  static int puc_setup_intr(device_t, device_t, struct resource *, int,
      void (*)(void *), void *, void **, lwkt_serialize_t);
  static int puc_teardown_intr(device_t, device_t, struct resource *,
      void *);
  static int puc_read_ivar(device_t, device_t, int, uintptr_t *);
  
  static const struct puc_device_description *puc_find_description(uint32_t,
      uint32_t, uint32_t, uint32_t);
  static void puc_config_superio(device_t);
  static void puc_config_win877(struct resource *);
  static int puc_find_free_unit(char *);
  #ifdef PUC_DEBUG
  static void puc_print_win877(bus_space_tag_t, bus_space_handle_t, u_int,
      u_int);
  static void puc_print_resource_list(struct resource_list *);
  #endif
  
  static int
  puc_pci_probe(device_t dev)
  {
  	uint32_t v1, v2, d1, d2;
  	const struct puc_device_description *desc;
  
  	if ((pci_read_config(dev, PCIR_HDRTYPE, 1) & PCIM_HDRTYPE) != 0)
  		return (ENXIO);
  
  	v1 = pci_read_config(dev, PCIR_VENDOR, 2);
  	d1 = pci_read_config(dev, PCIR_DEVICE, 2);
  	v2 = pci_read_config(dev, PCIR_SUBVEND_0, 2);
  	d2 = pci_read_config(dev, PCIR_SUBDEV_0, 2);
  
  	desc = puc_find_description(v1, d1, v2, d2);
  	if (desc == NULL)
  		return (ENXIO);
  	device_set_desc(dev, desc->name);
  	return (0);
  }
  
  static int
  puc_probe_ilr(struct puc_softc *sc, struct resource *res)
  {
  	u_char t1, t2;
  	int i;
  
  	switch (sc->sc_desc->ilr_type) {
  	case PUC_ILR_TYPE_DIGI:
  		sc->ilr_st = rman_get_bustag(res);
  		sc->ilr_sh = rman_get_bushandle(res);
  		for (i = 0; i < 2; i++) {
  			t1 = bus_space_read_1(sc->ilr_st, sc->ilr_sh,
  			    sc->sc_desc->ilr_offset[i]);
  			t1 = ~t1;
  			bus_space_write_1(sc->ilr_st, sc->ilr_sh,
  			    sc->sc_desc->ilr_offset[i], t1);
  			t2 = bus_space_read_1(sc->ilr_st, sc->ilr_sh,
  			    sc->sc_desc->ilr_offset[i]);
  			if (t2 == t1)
  				return (0);
  		}
  		return (1);
  
  	default:
  		break;
  	}
  	return (0);
  }
  
  static int
  puc_pci_attach(device_t dev)
  {
  	char *typestr;
  	int bidx, childunit, i, irq_setup, rid;
  	uint32_t v1, v2, d1, d2;
  	struct puc_softc *sc;
  	struct puc_device *pdev;
  	struct resource *res;
  	struct resource_list_entry *rle;
  
  	sc = (struct puc_softc *)device_get_softc(dev);
  	bzero(sc, sizeof(*sc));
  	v1 = pci_read_config(dev, PCIR_VENDOR, 2);
  	d1 = pci_read_config(dev, PCIR_DEVICE, 2);
  	v2 = pci_read_config(dev, PCIR_SUBVEND_0, 2);
  	d2 = pci_read_config(dev, PCIR_SUBDEV_0, 2);
  	sc->sc_desc = puc_find_description(v1, d1, v2, d2);
  	if (sc->sc_desc == NULL)
  		return (ENXIO);
  
  #ifdef PUC_DEBUG
  	bootverbose = 1;
  
  	kprintf("puc: name: %s\n", sc->sc_desc->name);
  #endif
  	rid = 0;
  	res = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1,
  	    RF_ACTIVE | RF_SHAREABLE);
  	if (!res)
  		return (ENXIO);
  
  	sc->irqres = res;
  	sc->irqrid = rid;
  	irq_setup = BUS_SETUP_INTR(device_get_parent(dev), dev, res,
  				   0, puc_intr, sc,
  				   &sc->intr_cookie, NULL, NULL);
  	if (irq_setup != 0)
  		return (ENXIO);
  
  	rid = 0;
  	for (i = 0; PUC_PORT_VALID(sc->sc_desc, i); i++) {
  		if (rid == sc->sc_desc->ports[i].bar)
  			sc->barmuxed = 1;
  		rid = sc->sc_desc->ports[i].bar;
  		bidx = PUC_PORT_BAR_INDEX(rid);
  
  		if (sc->sc_bar_mappings[bidx].res != NULL)
  			continue;
  		res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
  		    0ul, ~0ul, 1, RF_ACTIVE);
  		if (res == NULL) {
  			kprintf("could not get resource\n");
  			continue;
  		}
  		sc->sc_bar_mappings[bidx].res = res;
  
  		if (sc->sc_desc->ilr_type != PUC_ILR_TYPE_NONE) {
  			sc->ilr_enabled = puc_probe_ilr(sc, res);
  			if (sc->ilr_enabled)
  				device_printf(dev, "ILR enabled\n");
  			else
  				device_printf(dev, "ILR disabled\n");
  		}
  #ifdef PUC_DEBUG
  		kprintf("port bst %x, start %x, end %x\n",
  		    (u_int)rman_get_bustag(res), (u_int)rman_get_start(res),
  		    (u_int)rman_get_end(res));
  #endif
  	}
  
  	puc_config_superio(dev);
  
  	for (i = 0; PUC_PORT_VALID(sc->sc_desc, i); i++) {
  		rid = sc->sc_desc->ports[i].bar;
  		bidx = PUC_PORT_BAR_INDEX(rid);
  		if (sc->sc_bar_mappings[bidx].res == NULL)
  			continue;
  
  		switch (sc->sc_desc->ports[i].type) {
  		case PUC_PORT_TYPE_COM:
  			typestr = "sio";
  			break;
  		default:
  			continue;
  		}
  		pdev = kmalloc(sizeof(struct puc_device), M_DEVBUF,
  				M_WAITOK | M_ZERO);
  		resource_list_init(&pdev->resources);
  
  		/* First fake up an IRQ resource. */
  		resource_list_add(&pdev->resources, SYS_RES_IRQ, 0,
  		    rman_get_start(sc->irqres), rman_get_end(sc->irqres),
  		    rman_get_end(sc->irqres) - rman_get_start(sc->irqres) + 1,
  		    rman_get_cpuid(sc->irqres));
  		rle = resource_list_find(&pdev->resources, SYS_RES_IRQ, 0);
  		rle->res = sc->irqres;
  
  		/* Now fake an IOPORT resource */
  		res = sc->sc_bar_mappings[bidx].res;
  		resource_list_add(&pdev->resources, SYS_RES_IOPORT, 0,
  		    rman_get_start(res) + sc->sc_desc->ports[i].offset,
  		    rman_get_end(res) + sc->sc_desc->ports[i].offset + 8 - 1,
  		    8, -1);
  		rle = resource_list_find(&pdev->resources, SYS_RES_IOPORT, 0);
  
  		if (sc->barmuxed == 0) {
  			rle->res = sc->sc_bar_mappings[bidx].res;
  		} else {
  			rle->res = kmalloc(sizeof(struct resource), M_DEVBUF,
  			    M_WAITOK | M_ZERO);
  
  			rle->res->r_start = rman_get_start(res) +
  			    sc->sc_desc->ports[i].offset;
  			rle->res->r_end = rle->res->r_start + 8 - 1;
  			rle->res->r_bustag = rman_get_bustag(res);
  			bus_space_subregion(rle->res->r_bustag,
  			    rman_get_bushandle(res),
  			    sc->sc_desc->ports[i].offset, 8,
  			    &rle->res->r_bushandle);
  		}
  
  		pdev->serialfreq = sc->sc_desc->ports[i].serialfreq;
  
  		childunit = puc_find_free_unit(typestr);
  		sc->sc_ports[i].dev = device_add_child(dev, typestr, childunit);
  		if (sc->sc_ports[i].dev == NULL) {
  			if (sc->barmuxed) {
  				bus_space_unmap(rman_get_bustag(rle->res),
  						rman_get_bushandle(rle->res),
  						8);
  				kfree(rle->res, M_DEVBUF);
  				kfree(pdev, M_DEVBUF);
  			}
  			continue;
  		}
  		device_set_ivars(sc->sc_ports[i].dev, pdev);
  		device_set_desc(sc->sc_ports[i].dev, sc->sc_desc->name);
  		if (!bootverbose)
  			device_quiet(sc->sc_ports[i].dev);
  #ifdef PUC_DEBUG
  		kprintf("puc: type %d, bar %x, offset %x\n",
  		    sc->sc_desc->ports[i].type,
  		    sc->sc_desc->ports[i].bar,
  		    sc->sc_desc->ports[i].offset);
  		print_resource_list(&pdev->resources);
  #endif
  		device_set_flags(sc->sc_ports[i].dev,
  		    sc->sc_desc->ports[i].flags);
  		if (device_probe_and_attach(sc->sc_ports[i].dev) != 0) {
  			if (sc->barmuxed) {
  				bus_space_unmap(rman_get_bustag(rle->res),
  						rman_get_bushandle(rle->res),
  						8);
  				kfree(rle->res, M_DEVBUF);
  				kfree(pdev, M_DEVBUF);
  			}
  		}
  	}
  
  #ifdef PUC_DEBUG
  	bootverbose = 0;
  #endif
  	return (0);
  }
  
  static u_int32_t
  puc_ilr_read(struct puc_softc *sc)
  {
  	u_int32_t mask;
  	int i;
  
  	mask = 0;
  	switch (sc->sc_desc->ilr_type) {
  	case PUC_ILR_TYPE_DIGI:
  		for (i = 1; i >= 0; i--) {
  			mask = (mask << 8) | (bus_space_read_1(sc->ilr_st,
  			    sc->ilr_sh, sc->sc_desc->ilr_offset[i]) & 0xff);
  		}
  		break;
  
  	default:
  		mask = 0xffffffff;
  		break;
  	}
  	return (mask);
  }
  
  /*
   * This is an interrupt handler. For boards that can't tell us which
   * device generated the interrupt it just calls all the registered
   * handlers sequencially, but for boards that can tell us which
   * device(s) generated the interrupt it calls only handlers for devices
   * that actually generated the interrupt.
   */
  static void
  puc_intr(void *arg)
  {
  	int i;
  	u_int32_t ilr_mask;
  	struct puc_softc *sc;
  
  	sc = (struct puc_softc *)arg;
  	ilr_mask = sc->ilr_enabled ? puc_ilr_read(sc) : 0xffffffff;
  	for (i = 0; i < PUC_MAX_PORTS; i++)
  		if (sc->sc_ports[i].ihand != NULL &&
  		    ((ilr_mask >> i) & 0x00000001))
  			(sc->sc_ports[i].ihand)(sc->sc_ports[i].ihandarg);
  }
  
  static const struct puc_device_description *
  puc_find_description(uint32_t vend, uint32_t prod, uint32_t svend, 
      uint32_t sprod)
  {
  	int i;
  
  #define checkreg(val, index) \
      (((val) & puc_devices[i].rmask[(index)]) == puc_devices[i].rval[(index)])
  
  	for (i = 0; puc_devices[i].name != NULL; i++) {
  		if (checkreg(vend, PUC_REG_VEND) &&
  		    checkreg(prod, PUC_REG_PROD) &&
  		    checkreg(svend, PUC_REG_SVEND) &&
  		    checkreg(sprod, PUC_REG_SPROD))
  			return (&puc_devices[i]);
  	}
  
  #undef checkreg
  
  	return (NULL);
  }
  
  /*
   * It might be possible to make these more generic if we can detect patterns.
   * For instance maybe if the size of a bar is 0x400 (the old isa space) it
   * might contain one or more superio chips.
   */
  static void
  puc_config_superio(device_t dev)
  {
  	struct puc_softc *sc = (struct puc_softc *)device_get_softc(dev);
  
  	if (sc->sc_desc->rval[PUC_REG_VEND] == 0x1592 &&
  	    sc->sc_desc->rval[PUC_REG_PROD] == 0x0781)
  		puc_config_win877(sc->sc_bar_mappings[0].res);
  }
  
  #define rdspio(indx)		(bus_space_write_1(bst, bsh, efir, indx), \
  				bus_space_read_1(bst, bsh, efdr))
  #define wrspio(indx,data)	(bus_space_write_1(bst, bsh, efir, indx), \
  				bus_space_write_1(bst, bsh, efdr, data))
  
  #ifdef PUC_DEBUG
  static void
  puc_print_win877(bus_space_tag_t bst, bus_space_handle_t bsh, u_int efir,
  	u_int efdr)
  {
  	u_char cr00, cr01, cr04, cr09, cr0d, cr14, cr15, cr16, cr17;
  	u_char cr18, cr19, cr24, cr25, cr28, cr2c, cr31, cr32;
  
  	cr00 = rdspio(0x00);
  	cr01 = rdspio(0x01);
  	cr04 = rdspio(0x04);
  	cr09 = rdspio(0x09);
  	cr0d = rdspio(0x0d);
  	cr14 = rdspio(0x14);
  	cr15 = rdspio(0x15);
  	cr16 = rdspio(0x16);
  	cr17 = rdspio(0x17);
  	cr18 = rdspio(0x18);
  	cr19 = rdspio(0x19);
  	cr24 = rdspio(0x24);
  	cr25 = rdspio(0x25);
  	cr28 = rdspio(0x28);
  	cr2c = rdspio(0x2c);
  	cr31 = rdspio(0x31);
  	cr32 = rdspio(0x32);
  	kprintf("877T: cr00 %x, cr01 %x, cr04 %x, cr09 %x, cr0d %x, cr14 %x, "
  	    "cr15 %x, cr16 %x, cr17 %x, cr18 %x, cr19 %x, cr24 %x, cr25 %x, "
  	    "cr28 %x, cr2c %x, cr31 %x, cr32 %x\n", cr00, cr01, cr04, cr09,
  	    cr0d, cr14, cr15, cr16, cr17,
  	    cr18, cr19, cr24, cr25, cr28, cr2c, cr31, cr32);
  }
  #endif
  
  static void
  puc_config_win877(struct resource *res)
  {
  	u_char val;
  	u_int efir, efdr;
  	bus_space_tag_t bst;
  	bus_space_handle_t bsh;
  
  	bst = rman_get_bustag(res);
  	bsh = rman_get_bushandle(res);
  
  	/* configure the first W83877TF */
  	bus_space_write_1(bst, bsh, 0x250, 0x89);
  	efir = 0x251;
  	efdr = 0x252;
  	val = rdspio(0x09) & 0x0f;
  	if (val != 0x0c) {
  		kprintf("conf_win877: Oops not a W83877TF\n");
  		return;
  	}
  
  #ifdef PUC_DEBUG
  	kprintf("before: ");
  	puc_print_win877(bst, bsh, efir, efdr);
  #endif
  
  	val = rdspio(0x16);
  	val |= 0x04;
  	wrspio(0x16, val);
  	val &= ~0x04;
  	wrspio(0x16, val);
  
  	wrspio(0x24, 0x2e8 >> 2);
  	wrspio(0x25, 0x2f8 >> 2);
  	wrspio(0x17, 0x03);
  	wrspio(0x28, 0x43);
  
  #ifdef PUC_DEBUG
  	kprintf("after: ");
  	puc_print_win877(bst, bsh, efir, efdr);
  #endif
  
  	bus_space_write_1(bst, bsh, 0x250, 0xaa);
  
  	/* configure the second W83877TF */
  	bus_space_write_1(bst, bsh, 0x3f0, 0x87);
  	bus_space_write_1(bst, bsh, 0x3f0, 0x87);
  	efir = 0x3f0;
  	efdr = 0x3f1;
  	val = rdspio(0x09) & 0x0f;
  	if (val != 0x0c) {
  		kprintf("conf_win877: Oops not a W83877TF\n");
  		return;
  	}
  
  #ifdef PUC_DEBUG
  	kprintf("before: ");
  	puc_print_win877(bst, bsh, efir, efdr);
  #endif
  
  	val = rdspio(0x16);
  	val |= 0x04;
  	wrspio(0x16, val);
  	val &= ~0x04;
  	wrspio(0x16, val);
  
  	wrspio(0x24, 0x3e8 >> 2);
  	wrspio(0x25, 0x3f8 >> 2);
  	wrspio(0x17, 0x03);
  	wrspio(0x28, 0x43);
  
  #ifdef PUC_DEBUG
  	kprintf("after: ");
  	puc_print_win877(bst, bsh, efir, efdr);
  #endif
  
  	bus_space_write_1(bst, bsh, 0x3f0, 0xaa);
  }
  
  #undef rdspio
  #undef wrspio
  
  static int puc_find_free_unit(char *name)
  {
  	devclass_t dc;
  	int start;
  	int unit;
  
  	unit = 0;
  	start = 0;
  	while (resource_int_value(name, unit, "port", &start) == 0 && 
  	    start > 0)
  		unit++;
  	dc = devclass_find(name);
  	if (dc == NULL)
  		return (-1);
  	while (devclass_get_device(dc, unit))
  		unit++;
  #ifdef PUC_DEBUG
  	kprintf("puc: Using %s%d\n", name, unit);
  #endif
  	return (unit);
  }
  
  #ifdef PUC_DEBUG
  static void
  puc_print_resource_list(struct resource_list *rl)
  {
  	struct resource_list_entry *rle;
  
  	kprintf("print_resource_list: rl %p\n", rl);
  	SLIST_FOREACH(rle, rl, link)
  		kprintf("type %x, rid %x\n", rle->type, rle->rid);
  	kprintf("print_resource_list: end.\n");
  }
  #endif
  
  static struct resource *
  puc_alloc_resource(device_t dev, device_t child, int type, int *rid,
      u_long start, u_long end, u_long count, u_int flags, int cpuid __unused)
  {
  	struct puc_device *pdev;
  	struct resource *retval;
  	struct resource_list *rl;
  	struct resource_list_entry *rle;
  
  	pdev = device_get_ivars(child);
  	rl = &pdev->resources;
  
  #ifdef PUC_DEBUG
  	kprintf("puc_alloc_resource: pdev %p, looking for t %x, r %x\n",
  	    pdev, type, *rid);
  	puc_print_resource_list(rl);
  #endif
  	retval = NULL;
  	rle = resource_list_find(rl, type, *rid);
  	if (rle) {
  		start = rle->start;
  		end = rle->end;
  		count = rle->count;
  #ifdef PUC_DEBUG
  		kprintf("found rle, %lx, %lx, %lx\n", start, end, count);
  #endif
  		retval = rle->res;
  	} else
  		kprintf("oops rle is gone\n");
  
  	return (retval);
  }
  
  static int
  puc_release_resource(device_t dev, device_t child, int type, int rid,
      struct resource *res)
  {
  	return (0);
  }
  
  static int
  puc_get_resource(device_t dev, device_t child, int type, int rid,
      u_long *startp, u_long *countp)
  {
  	struct puc_device *pdev;
  	struct resource_list *rl;
  	struct resource_list_entry *rle;
  
  	pdev = device_get_ivars(child);
  	rl = &pdev->resources;
  
  #ifdef PUC_DEBUG
  	kprintf("puc_get_resource: pdev %p, looking for t %x, r %x\n", pdev,
  	    type, rid);
  	puc_print_resource_list(rl);
  #endif
  	rle = resource_list_find(rl, type, rid);
  	if (rle) {
  #ifdef PUC_DEBUG
  		kprintf("found rle %p,", rle);
  #endif
  		if (startp != NULL)
  			*startp = rle->start;
  		if (countp != NULL)
  			*countp = rle->count;
  #ifdef PUC_DEBUG
  		kprintf(" %lx, %lx\n", rle->start, rle->count);
  #endif
  		return (0);
  	} else
  		kprintf("oops rle is gone\n");
  	return (ENXIO);
  }
  
  static int
  puc_setup_intr(device_t dev, device_t child, struct resource *r, int flags,
  	       void (*ihand)(void *), void *arg,
  	       void **cookiep, lwkt_serialize_t serializer)
  {
  	int i;
  	struct puc_softc *sc;
  
  	sc = (struct puc_softc *)device_get_softc(dev);
  	for (i = 0; PUC_PORT_VALID(sc->sc_desc, i); i++) {
  		if (sc->sc_ports[i].dev == child) {
  			if (sc->sc_ports[i].ihand != NULL)
  				return (ENXIO);
  			sc->sc_ports[i].ihand = ihand;
  			sc->sc_ports[i].ihandarg = arg;
  			KKASSERT(serializer == NULL); /* not handled yet XXX */
  			*cookiep = arg;
  			return (0);
  		}
  	}
  	return (ENXIO);
  }
  
  static int
  puc_teardown_intr(device_t dev, device_t child, struct resource *r,
  		  void *cookie)
  {
  	int i;
  	struct puc_softc *sc;
  
  	sc = (struct puc_softc *)device_get_softc(dev);
  	for (i = 0; PUC_PORT_VALID(sc->sc_desc, i); i++) {
  		if (sc->sc_ports[i].dev == child) {
  			sc->sc_ports[i].ihand = NULL;
  			sc->sc_ports[i].ihandarg = NULL;
  			return (0);
  		}
  	}
  	return (ENXIO);
  }
  
  static int
  puc_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
  {
  	struct puc_device *pdev;
  
  	pdev = device_get_ivars(child);
  	if (pdev == NULL)
  		return (ENOENT);
  
  	switch(index) {
  	case PUC_IVAR_FREQ:
  		*result = pdev->serialfreq;
  		break;
  	default:
  		return (ENOENT);
  	}
  	return (0);
  }
  
  static device_method_t puc_pci_methods[] = {
      /* Device interface */
      DEVMETHOD(device_probe,		puc_pci_probe),
      DEVMETHOD(device_attach,		puc_pci_attach),
  
      DEVMETHOD(bus_alloc_resource,	puc_alloc_resource),
      DEVMETHOD(bus_release_resource,	puc_release_resource),
      DEVMETHOD(bus_get_resource,		puc_get_resource),
      DEVMETHOD(bus_read_ivar,		puc_read_ivar),
      DEVMETHOD(bus_setup_intr,		puc_setup_intr),
      DEVMETHOD(bus_teardown_intr,	puc_teardown_intr),
      DEVMETHOD(bus_print_child,		bus_generic_print_child),
      DEVMETHOD(bus_driver_added,		bus_generic_driver_added),
      { 0, 0 }
  };
  
  static driver_t puc_pci_driver = {
  	"puc",
  	puc_pci_methods,
  	sizeof(struct puc_softc),
  };
  
  static devclass_t puc_devclass;
  
  DRIVER_MODULE(puc, pci, puc_pci_driver, puc_devclass, NULL, NULL);
  