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empb.c revision 1.1
      1  1.1  rkujawa /*	$NetBSD: empb.c,v 1.1 2012/05/30 18:01:51 rkujawa Exp $ */
      2  1.1  rkujawa 
      3  1.1  rkujawa /*-
      4  1.1  rkujawa  * Copyright (c) 2012 The NetBSD Foundation, Inc.
      5  1.1  rkujawa  * All rights reserved.
      6  1.1  rkujawa  *
      7  1.1  rkujawa  * This code is derived from software contributed to The NetBSD Foundation
      8  1.1  rkujawa  * by Radoslaw Kujawa.
      9  1.1  rkujawa  *
     10  1.1  rkujawa  * Redistribution and use in source and binary forms, with or without
     11  1.1  rkujawa  * modification, are permitted provided that the following conditions
     12  1.1  rkujawa  * are met:
     13  1.1  rkujawa  * 1. Redistributions of source code must retain the above copyright
     14  1.1  rkujawa  *    notice, this list of conditions and the following disclaimer.
     15  1.1  rkujawa  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.1  rkujawa  *    notice, this list of conditions and the following disclaimer in the
     17  1.1  rkujawa  *    documentation and/or other materials provided with the distribution.
     18  1.1  rkujawa  *
     19  1.1  rkujawa  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.1  rkujawa  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.1  rkujawa  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.1  rkujawa  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.1  rkujawa  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.1  rkujawa  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.1  rkujawa  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.1  rkujawa  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.1  rkujawa  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.1  rkujawa  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.1  rkujawa  * POSSIBILITY OF SUCH DAMAGE.
     30  1.1  rkujawa  */
     31  1.1  rkujawa 
     32  1.1  rkujawa /* Elbox Mediator PCI bridge driver. Currently supports Mediator 1200 models.*/
     33  1.1  rkujawa 
     34  1.1  rkujawa #include <sys/types.h>
     35  1.1  rkujawa #include <sys/param.h>
     36  1.1  rkujawa #include <sys/time.h>
     37  1.1  rkujawa #include <sys/systm.h>
     38  1.1  rkujawa #include <sys/errno.h>
     39  1.1  rkujawa #include <sys/device.h>
     40  1.1  rkujawa #include <sys/malloc.h>
     41  1.1  rkujawa #include <sys/extent.h>
     42  1.1  rkujawa #include <sys/kmem.h>
     43  1.1  rkujawa 
     44  1.1  rkujawa #include <uvm/uvm_extern.h>
     45  1.1  rkujawa 
     46  1.1  rkujawa #include <machine/bus.h>
     47  1.1  rkujawa #include <machine/cpu.h>
     48  1.1  rkujawa 
     49  1.1  rkujawa #include <m68k/bus_dma.h>
     50  1.1  rkujawa #include <amiga/dev/zbusvar.h>
     51  1.1  rkujawa #include <amiga/pci/empbreg.h>
     52  1.1  rkujawa #include <amiga/pci/emmemvar.h>
     53  1.1  rkujawa 
     54  1.1  rkujawa #include <dev/pci/pcivar.h>
     55  1.1  rkujawa #include <dev/pci/pcireg.h>
     56  1.1  rkujawa #include <dev/pci/pcidevs.h>
     57  1.1  rkujawa #include <dev/pci/pciconf.h>
     58  1.1  rkujawa 
     59  1.1  rkujawa #include "opt_pci.h"
     60  1.1  rkujawa 
     61  1.1  rkujawa /* #define EMPB_DEBUG 1 */
     62  1.1  rkujawa 
     63  1.1  rkujawa #define	PCI_CONF_LOCK(s)	(s) = splhigh()
     64  1.1  rkujawa #define	PCI_CONF_UNLOCK(s)	splx((s))
     65  1.1  rkujawa 
     66  1.1  rkujawa struct empb_softc {
     67  1.1  rkujawa 	device_t			sc_dev;
     68  1.1  rkujawa 
     69  1.1  rkujawa 	struct bus_space_tag		setup_area;
     70  1.1  rkujawa 	bus_space_tag_t			setup_area_t;
     71  1.1  rkujawa 	bus_space_handle_t		setup_area_h;
     72  1.1  rkujawa 
     73  1.1  rkujawa 	struct bus_space_tag		pci_confio_area;
     74  1.1  rkujawa 	bus_space_tag_t			pci_confio_t;
     75  1.1  rkujawa 	bus_space_handle_t		pci_confio_h;
     76  1.1  rkujawa 	uint8_t				pci_confio_mode;
     77  1.1  rkujawa 
     78  1.1  rkujawa 	struct bus_space_tag		pci_mem_window;
     79  1.1  rkujawa 	uint32_t			pci_mem_window_size;
     80  1.1  rkujawa 
     81  1.1  rkujawa 	struct amiga_pci_chipset	apc;
     82  1.1  rkujawa 
     83  1.1  rkujawa };
     84  1.1  rkujawa 
     85  1.1  rkujawa static int	empb_match(struct device *, struct cfdata *, void *);
     86  1.1  rkujawa static void	empb_attach(struct device *, struct device *, void *);
     87  1.1  rkujawa static void	empb_callback(device_t self);
     88  1.1  rkujawa 
     89  1.1  rkujawa /*static bool	empb_find_mem(struct empb_softc *sc);*/
     90  1.1  rkujawa void		empb_switch_bridge(struct empb_softc *sc, uint8_t mode);
     91  1.1  rkujawa 
     92  1.1  rkujawa pcireg_t	empb_pci_conf_read(pci_chipset_tag_t, pcitag_t, int);
     93  1.1  rkujawa void		empb_pci_conf_write(pci_chipset_tag_t, pcitag_t, int, pcireg_t);
     94  1.1  rkujawa int		empb_pci_bus_maxdevs(pci_chipset_tag_t pc, int busno);
     95  1.1  rkujawa void		empb_pci_attach_hook(struct device *parent,
     96  1.1  rkujawa 		    struct device *self, struct pcibus_attach_args *pba);
     97  1.1  rkujawa pcitag_t	empb_pci_make_tag(pci_chipset_tag_t pc, int bus, int device,
     98  1.1  rkujawa 		    int function);
     99  1.1  rkujawa void		empb_pci_decompose_tag(pci_chipset_tag_t pc, pcitag_t tag,
    100  1.1  rkujawa 		    int *bp, int *dp, int *fp);
    101  1.1  rkujawa int		empb_pci_intr_map(const struct pci_attach_args *pa,
    102  1.1  rkujawa 		    pci_intr_handle_t *ihp);
    103  1.1  rkujawa const struct evcnt * empb_pci_intr_evcnt(pci_chipset_tag_t pc,
    104  1.1  rkujawa 		    pci_intr_handle_t ih);
    105  1.1  rkujawa 
    106  1.1  rkujawa CFATTACH_DECL_NEW(empb, sizeof(struct empb_softc),
    107  1.1  rkujawa     empb_match, empb_attach, NULL, NULL);
    108  1.1  rkujawa 
    109  1.1  rkujawa static int
    110  1.1  rkujawa empb_match(device_t parent, cfdata_t cf, void *aux)
    111  1.1  rkujawa {
    112  1.1  rkujawa 	struct zbus_args *zap;
    113  1.1  rkujawa 
    114  1.1  rkujawa 	zap = aux;
    115  1.1  rkujawa 
    116  1.1  rkujawa 	if (zap->manid != ZORRO_MANID_ELBOX)
    117  1.1  rkujawa 		return 0;
    118  1.1  rkujawa 
    119  1.1  rkujawa 	switch (zap->prodid) {
    120  1.1  rkujawa 	case ZORRO_PRODID_MED1K2:
    121  1.1  rkujawa 	case ZORRO_PRODID_MED1K2SX:
    122  1.1  rkujawa 	case ZORRO_PRODID_MED1K2LT2:
    123  1.1  rkujawa 	case ZORRO_PRODID_MED1K2LT4:
    124  1.1  rkujawa 	case ZORRO_PRODID_MED1K2TX:
    125  1.1  rkujawa 		return 1;
    126  1.1  rkujawa 	}
    127  1.1  rkujawa 
    128  1.1  rkujawa 	return 0;
    129  1.1  rkujawa }
    130  1.1  rkujawa 
    131  1.1  rkujawa 
    132  1.1  rkujawa static void
    133  1.1  rkujawa empb_attach(device_t parent, device_t self, void *aux)
    134  1.1  rkujawa {
    135  1.1  rkujawa 	struct empb_softc *sc;
    136  1.1  rkujawa 	struct zbus_args *zap;
    137  1.1  rkujawa 
    138  1.1  rkujawa 	volatile char *ba;
    139  1.1  rkujawa 
    140  1.1  rkujawa 	zap = aux;
    141  1.1  rkujawa 	sc = device_private(self);
    142  1.1  rkujawa 	sc->sc_dev = self;
    143  1.1  rkujawa 	ba = zap->va;
    144  1.1  rkujawa 
    145  1.1  rkujawa 	switch (zap->prodid) {
    146  1.1  rkujawa 	case ZORRO_PRODID_MED1K2:
    147  1.1  rkujawa 		aprint_normal(": ELBOX Mediator PCI 1200\n");
    148  1.1  rkujawa 		break;
    149  1.1  rkujawa 	case ZORRO_PRODID_MED1K2SX:
    150  1.1  rkujawa 		aprint_normal(": ELBOX Mediator PCI 1200 SX\n");
    151  1.1  rkujawa 		break;
    152  1.1  rkujawa 	case ZORRO_PRODID_MED1K2LT2:
    153  1.1  rkujawa 		aprint_normal(": ELBOX Mediator PCI 1200 LT2\n");
    154  1.1  rkujawa 		break;
    155  1.1  rkujawa 	case ZORRO_PRODID_MED1K2LT4:
    156  1.1  rkujawa 		aprint_normal(": ELBOX Mediator PCI 1200 LT4\n");
    157  1.1  rkujawa 		break;
    158  1.1  rkujawa 	case ZORRO_PRODID_MED1K2TX:
    159  1.1  rkujawa 		aprint_normal(": ELBOX Mediator PCI 1200 TX\n");
    160  1.1  rkujawa 		break;
    161  1.1  rkujawa 	default:
    162  1.1  rkujawa 		aprint_normal(": ELBOX Mediator PCI (unknown)\n");
    163  1.1  rkujawa 		break;
    164  1.1  rkujawa 	}
    165  1.1  rkujawa 
    166  1.1  rkujawa 	/* Setup bus space mappings. */
    167  1.1  rkujawa 	sc->pci_confio_area.base = (bus_addr_t) ba + EMPB_BRIDGE_OFF;
    168  1.1  rkujawa 	sc->pci_confio_area.absm = &amiga_bus_stride_1swap;
    169  1.1  rkujawa 
    170  1.1  rkujawa 	sc->setup_area.base = (bus_addr_t) ba + EMPB_SETUP_OFF;
    171  1.1  rkujawa 	sc->setup_area.absm = &amiga_bus_stride_1;
    172  1.1  rkujawa 
    173  1.1  rkujawa 	/*
    174  1.1  rkujawa 	 * Defer everything until later, we need to wait for possible
    175  1.1  rkujawa 	 * emmem attachments.
    176  1.1  rkujawa 	 */
    177  1.1  rkujawa 
    178  1.1  rkujawa 	config_defer(self, empb_callback);
    179  1.1  rkujawa }
    180  1.1  rkujawa 
    181  1.1  rkujawa static void
    182  1.1  rkujawa empb_callback(device_t self) {
    183  1.1  rkujawa 
    184  1.1  rkujawa 	struct empb_softc *sc;
    185  1.1  rkujawa 	pci_chipset_tag_t pc;
    186  1.1  rkujawa 	struct pcibus_attach_args pba;
    187  1.1  rkujawa 
    188  1.1  rkujawa 	sc = device_private(self);
    189  1.1  rkujawa 	pc = &sc->apc;
    190  1.1  rkujawa 
    191  1.1  rkujawa #ifdef EMPB_DEBUG
    192  1.1  rkujawa 	aprint_normal("empb: mapped setup %x->%x, conf/io %x->%x\n",
    193  1.1  rkujawa 	    kvtop((void*) sc->setup_area.base), sc->setup_area.base,
    194  1.1  rkujawa 	    kvtop((void*) sc->pci_confio_area.base), sc->pci_confio_area.base);
    195  1.1  rkujawa #endif
    196  1.1  rkujawa 
    197  1.1  rkujawa 	sc->pci_confio_t = &(sc->pci_confio_area);
    198  1.1  rkujawa 
    199  1.1  rkujawa 	if (bus_space_map(sc->pci_confio_t, 0, EMPB_BRIDGE_SIZE, 0,
    200  1.1  rkujawa 	    &sc->pci_confio_h))
    201  1.1  rkujawa 		aprint_error_dev(self,
    202  1.1  rkujawa 		    "couldn't map PCI configuration & I/O space\n");
    203  1.1  rkujawa 
    204  1.1  rkujawa 	sc->apc.pci_conf_datat = sc->pci_confio_t;
    205  1.1  rkujawa 	sc->apc.pci_conf_datah = sc->pci_confio_h;
    206  1.1  rkujawa 
    207  1.1  rkujawa 	sc->setup_area_t = &(sc->setup_area);
    208  1.1  rkujawa 
    209  1.1  rkujawa 	if (bus_space_map(sc->setup_area_t, 0, EMPB_SETUP_SIZE, 0,
    210  1.1  rkujawa 	    &sc->setup_area_h))
    211  1.1  rkujawa 		aprint_error_dev(self,
    212  1.1  rkujawa 		    "couldn't map Mediator setup space\n");
    213  1.1  rkujawa 
    214  1.1  rkujawa 	/* Initialize the PCI chipset tag. */
    215  1.1  rkujawa 	sc->apc.pc_conf_v = (void*) pc;
    216  1.1  rkujawa 	sc->apc.pc_bus_maxdevs = empb_pci_bus_maxdevs;
    217  1.1  rkujawa 	sc->apc.pc_make_tag = amiga_pci_make_tag;
    218  1.1  rkujawa 	sc->apc.pc_decompose_tag = amiga_pci_decompose_tag;
    219  1.1  rkujawa 	sc->apc.pc_conf_read = empb_pci_conf_read;
    220  1.1  rkujawa 	sc->apc.pc_conf_write = empb_pci_conf_write;
    221  1.1  rkujawa 	sc->apc.pc_attach_hook = empb_pci_attach_hook;
    222  1.1  rkujawa 
    223  1.1  rkujawa 	sc->apc.pc_intr_map = empb_pci_intr_map;
    224  1.1  rkujawa 	sc->apc.pc_intr_string = amiga_pci_intr_string;
    225  1.1  rkujawa 	sc->apc.pc_intr_establish = amiga_pci_intr_establish;
    226  1.1  rkujawa 	sc->apc.pc_intr_disestablish = amiga_pci_intr_disestablish;
    227  1.1  rkujawa 
    228  1.1  rkujawa 	sc->apc.pc_conf_hook = amiga_pci_conf_hook;
    229  1.1  rkujawa 	sc->apc.pc_conf_interrupt = amiga_pci_conf_interrupt;
    230  1.1  rkujawa 
    231  1.1  rkujawa 	sc->apc.cookie = sc;
    232  1.1  rkujawa 
    233  1.1  rkujawa 	pba.pba_iot = &(sc->pci_confio_area);
    234  1.1  rkujawa 	pba.pba_dmat = NULL;
    235  1.1  rkujawa 	pba.pba_dmat64 = NULL;
    236  1.1  rkujawa 	pba.pba_pc = pc;
    237  1.1  rkujawa 	pba.pba_flags = PCI_FLAGS_IO_OKAY;
    238  1.1  rkujawa 
    239  1.1  rkujawa 	/*if(sc->pci_mem_window_size > 0) {
    240  1.1  rkujawa 		pba.pba_memt = &(sc->pci_mem_window);
    241  1.1  rkujawa 		pba.pba_flags |= PCI_FLAGS_MEM_OKAY;
    242  1.1  rkujawa 	} else */
    243  1.1  rkujawa 		pba.pba_memt = NULL;
    244  1.1  rkujawa 
    245  1.1  rkujawa 	pba.pba_bus = 0;
    246  1.1  rkujawa 	pba.pba_bridgetag = NULL;
    247  1.1  rkujawa 
    248  1.1  rkujawa 	config_found_ia(self, "pcibus", &pba, pcibusprint);
    249  1.1  rkujawa }
    250  1.1  rkujawa 
    251  1.1  rkujawa /*
    252  1.1  rkujawa  * Switch between configuration space and I/O space.
    253  1.1  rkujawa  */
    254  1.1  rkujawa void
    255  1.1  rkujawa empb_switch_bridge(struct empb_softc *sc, uint8_t mode)
    256  1.1  rkujawa {
    257  1.1  rkujawa 	bus_space_write_1(sc->setup_area_t, sc->setup_area_h,
    258  1.1  rkujawa 	    EMPB_SETUP_BRIDGE_OFF, mode);
    259  1.1  rkujawa }
    260  1.1  rkujawa 
    261  1.1  rkujawa 
    262  1.1  rkujawa /*
    263  1.1  rkujawa  * Try to find a (optional) memory window board.
    264  1.1  rkujawa  */
    265  1.1  rkujawa /*bool
    266  1.1  rkujawa empb_find_mem(struct empb_softc *sc)
    267  1.1  rkujawa {
    268  1.1  rkujawa 	device_t memdev;
    269  1.1  rkujawa 	struct emmem_softc *mem_sc;
    270  1.1  rkujawa 
    271  1.1  rkujawa 	memdev = device_find_by_xname("emmem0");
    272  1.1  rkujawa 
    273  1.1  rkujawa 	if(memdev == NULL)
    274  1.1  rkujawa 		return false;
    275  1.1  rkujawa 
    276  1.1  rkujawa 	mem_sc = device_private(memdev);
    277  1.1  rkujawa 
    278  1.1  rkujawa 	sc->pci_mem_window.base = (bus_addr_t) mem_sc->sc_base;
    279  1.1  rkujawa 	sc->pci_mem_window.absm = &amiga_bus_stride_1;
    280  1.1  rkujawa 
    281  1.1  rkujawa 	sc->pci_mem_window_size = mem_sc->sc_size;
    282  1.1  rkujawa }*/
    283  1.1  rkujawa 
    284  1.1  rkujawa pcireg_t
    285  1.1  rkujawa empb_pci_conf_read(pci_chipset_tag_t pc, pcitag_t tag, int reg)
    286  1.1  rkujawa {
    287  1.1  rkujawa 	uint32_t data;
    288  1.1  rkujawa 	uint32_t bus, dev, func;
    289  1.1  rkujawa 	struct empb_softc *sc;
    290  1.1  rkujawa 	int s;
    291  1.1  rkujawa 
    292  1.1  rkujawa 	sc = pc->cookie;
    293  1.1  rkujawa 
    294  1.1  rkujawa 	pci_decompose_tag(pc, tag, &bus, &dev, &func);
    295  1.1  rkujawa 
    296  1.1  rkujawa 	PCI_CONF_LOCK(s);
    297  1.1  rkujawa 
    298  1.1  rkujawa 	empb_switch_bridge(sc, BRIDGE_CONF);
    299  1.1  rkujawa 
    300  1.1  rkujawa 	data = bus_space_read_4(pc->pci_conf_datat, pc->pci_conf_datah,
    301  1.1  rkujawa 	    EMPB_CONF_DEV_STRIDE*dev + EMPB_CONF_FUNC_STRIDE*func + reg);
    302  1.1  rkujawa #ifdef EMPB_DEBUG_CONF
    303  1.1  rkujawa 	aprint_normal("empb conf read va: %lx, bus: %d, dev: %d, "
    304  1.1  rkujawa 	    "func: %d, reg: %d -r-> data %x\n",
    305  1.1  rkujawa 	    pc->pci_conf_datah, bus, dev, func, reg, data);
    306  1.1  rkujawa #endif /* EMPB_DEBUG_CONF */
    307  1.1  rkujawa 
    308  1.1  rkujawa 	empb_switch_bridge(sc, BRIDGE_IO);
    309  1.1  rkujawa 
    310  1.1  rkujawa 	PCI_CONF_UNLOCK(s);
    311  1.1  rkujawa 
    312  1.1  rkujawa 	return data;
    313  1.1  rkujawa }
    314  1.1  rkujawa 
    315  1.1  rkujawa void
    316  1.1  rkujawa empb_pci_conf_write(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t val)
    317  1.1  rkujawa {
    318  1.1  rkujawa 	uint32_t bus, dev, func;
    319  1.1  rkujawa 	struct empb_softc *sc;
    320  1.1  rkujawa 	int s;
    321  1.1  rkujawa 
    322  1.1  rkujawa 	sc = pc->cookie;
    323  1.1  rkujawa 
    324  1.1  rkujawa 	pci_decompose_tag(pc, tag, &bus, &dev, &func);
    325  1.1  rkujawa 
    326  1.1  rkujawa 	PCI_CONF_LOCK(s);
    327  1.1  rkujawa 
    328  1.1  rkujawa 	empb_switch_bridge(sc, BRIDGE_CONF);
    329  1.1  rkujawa 
    330  1.1  rkujawa 	bus_space_write_4(pc->pci_conf_datat, pc->pci_conf_datah,
    331  1.1  rkujawa 	    EMPB_CONF_DEV_STRIDE*dev + EMPB_CONF_FUNC_STRIDE*func + reg, val);
    332  1.1  rkujawa #ifdef EMPB_DEBUG_CONF
    333  1.1  rkujawa 	aprint_normal("empb conf write va: %lx, bus: %d, dev: %d, "
    334  1.1  rkujawa 	    "func: %d, reg: %d -w-> data %x\n",
    335  1.1  rkujawa 	    pc->pci_conf_datah, bus, dev, func, reg, val);
    336  1.1  rkujawa #endif /* EMPB_DEBUG_CONF */
    337  1.1  rkujawa 	empb_switch_bridge(sc, BRIDGE_IO);
    338  1.1  rkujawa 
    339  1.1  rkujawa 	PCI_CONF_UNLOCK(s);
    340  1.1  rkujawa }
    341  1.1  rkujawa 
    342  1.1  rkujawa int
    343  1.1  rkujawa empb_pci_bus_maxdevs(pci_chipset_tag_t pc, int busno)
    344  1.1  rkujawa {
    345  1.1  rkujawa 	return 6; /* no Mediator with more than 6 slots? */
    346  1.1  rkujawa }
    347  1.1  rkujawa 
    348  1.1  rkujawa void
    349  1.1  rkujawa empb_pci_attach_hook(struct device *parent, struct device *self,
    350  1.1  rkujawa     struct pcibus_attach_args *pba)
    351  1.1  rkujawa {
    352  1.1  rkujawa }
    353  1.1  rkujawa 
    354  1.1  rkujawa int
    355  1.1  rkujawa empb_pci_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp)
    356  1.1  rkujawa {
    357  1.1  rkujawa 	/* TODO: add sanity checking */
    358  1.1  rkujawa 
    359  1.1  rkujawa 	*ihp = EMPB_INT;
    360  1.1  rkujawa 	return 0;
    361  1.1  rkujawa }
    362  1.1  rkujawa 
    363  1.1  rkujawa const struct evcnt *
    364  1.1  rkujawa empb_pci_intr_evcnt(pci_chipset_tag_t pc, pci_intr_handle_t ih)
    365  1.1  rkujawa {
    366  1.1  rkujawa 	/* TODO: implement */
    367  1.1  rkujawa 	return NULL;
    368  1.1  rkujawa }
    369  1.1  rkujawa 
    370