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if_fxp_pci.c revision 1.57
      1 /*	$NetBSD: if_fxp_pci.c,v 1.57 2008/03/21 07:47:43 dyoung Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1997, 1998, 1999, 2000, 2001 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
      9  * NASA Ames Research Center.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the NetBSD
     22  *	Foundation, Inc. and its contributors.
     23  * 4. Neither the name of The NetBSD Foundation nor the names of its
     24  *    contributors may be used to endorse or promote products derived
     25  *    from this software without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     37  * POSSIBILITY OF SUCH DAMAGE.
     38  */
     39 
     40 /*
     41  * PCI bus front-end for the Intel i82557 fast Ethernet controller
     42  * driver.  Works with Intel Etherexpress Pro 10+, 100B, 100+ cards.
     43  */
     44 
     45 #include <sys/cdefs.h>
     46 __KERNEL_RCSID(0, "$NetBSD: if_fxp_pci.c,v 1.57 2008/03/21 07:47:43 dyoung Exp $");
     47 
     48 #include "rnd.h"
     49 
     50 #include <sys/param.h>
     51 #include <sys/systm.h>
     52 #include <sys/mbuf.h>
     53 #include <sys/malloc.h>
     54 #include <sys/kernel.h>
     55 #include <sys/socket.h>
     56 #include <sys/ioctl.h>
     57 #include <sys/errno.h>
     58 #include <sys/device.h>
     59 
     60 #if NRND > 0
     61 #include <sys/rnd.h>
     62 #endif
     63 
     64 #include <machine/endian.h>
     65 
     66 #include <net/if.h>
     67 #include <net/if_dl.h>
     68 #include <net/if_media.h>
     69 #include <net/if_ether.h>
     70 
     71 #include <sys/bus.h>
     72 #include <sys/intr.h>
     73 
     74 #include <dev/mii/miivar.h>
     75 
     76 #include <dev/ic/i82557reg.h>
     77 #include <dev/ic/i82557var.h>
     78 
     79 #include <dev/pci/pcivar.h>
     80 #include <dev/pci/pcireg.h>
     81 #include <dev/pci/pcidevs.h>
     82 
     83 struct fxp_pci_softc {
     84 	struct fxp_softc psc_fxp;
     85 
     86 	pci_chipset_tag_t psc_pc;	/* pci chipset tag */
     87 	pcireg_t psc_regs[0x20>>2];	/* saved PCI config regs (sparse) */
     88 	pcitag_t psc_tag;		/* pci register tag */
     89 
     90 	int psc_pwrmgmt_csr_reg;	/* ACPI power management register */
     91 	pcireg_t psc_pwrmgmt_csr;	/* ...and the contents at D0 */
     92 	struct pci_conf_state psc_pciconf; /* standard PCI configuration regs */
     93 };
     94 
     95 static int	fxp_pci_match(struct device *, struct cfdata *, void *);
     96 static void	fxp_pci_attach(struct device *, struct device *, void *);
     97 
     98 static int	fxp_pci_enable(struct fxp_softc *);
     99 static void	fxp_pci_disable(struct fxp_softc *);
    100 
    101 static void fxp_pci_confreg_restore(struct fxp_pci_softc *psc);
    102 static bool fxp_pci_resume(device_t dv PMF_FN_PROTO);
    103 
    104 CFATTACH_DECL(fxp_pci, sizeof(struct fxp_pci_softc),
    105     fxp_pci_match, fxp_pci_attach, NULL, NULL);
    106 
    107 static const struct fxp_pci_product {
    108 	u_int32_t	fpp_prodid;	/* PCI product ID */
    109 	const char	*fpp_name;	/* device name */
    110 } fxp_pci_products[] = {
    111 	{ PCI_PRODUCT_INTEL_82557,
    112 	  "Intel i82557 Ethernet" },
    113 	{ PCI_PRODUCT_INTEL_82559ER,
    114 	  "Intel i82559ER Ethernet" },
    115 	{ PCI_PRODUCT_INTEL_IN_BUSINESS,
    116 	  "Intel InBusiness Ethernet" },
    117 	{ PCI_PRODUCT_INTEL_82801BA_LAN,
    118 	  "Intel i82562 Ethernet" },
    119 	{ PCI_PRODUCT_INTEL_82801E_LAN_1,
    120 	  "Intel i82559 Ethernet" },
    121 	{ PCI_PRODUCT_INTEL_82801E_LAN_2,
    122 	  "Intel i82559 Ethernet" },
    123 	{ PCI_PRODUCT_INTEL_PRO_100_VE_0,
    124 	  "Intel PRO/100 VE Network Controller" },
    125 	{ PCI_PRODUCT_INTEL_PRO_100_VE_1,
    126 	  "Intel PRO/100 VE Network Controller" },
    127 	{ PCI_PRODUCT_INTEL_PRO_100_VE_2,
    128 	  "Intel PRO/100 VE Network Controller with 82562ET/EZ PHY" },
    129 	{ PCI_PRODUCT_INTEL_PRO_100_VE_3,
    130 	  "Intel PRO/100 VE Network Controller with 82562ET/EZ (CNR) PHY" },
    131 	{ PCI_PRODUCT_INTEL_PRO_100_VE_4,
    132 	  "Intel PRO/100 VE (MOB) Network Controller" },
    133 	{ PCI_PRODUCT_INTEL_PRO_100_VE_5,
    134 	  "Intel PRO/100 VE (LOM) Network Controller" },
    135 	{ PCI_PRODUCT_INTEL_PRO_100_VE_6,
    136 	  "Intel PRO/100 VE Network Controller" },
    137 	{ PCI_PRODUCT_INTEL_PRO_100_VE_7,
    138 	  "Intel PRO/100 VE Network Controller" },
    139 	{ PCI_PRODUCT_INTEL_PRO_100_VE_8,
    140 	  "Intel PRO/100 VE Network Controller" },
    141 	{ PCI_PRODUCT_INTEL_PRO_100_VM_0,
    142 	  "Intel PRO/100 VM Network Controller" },
    143 	{ PCI_PRODUCT_INTEL_PRO_100_VM_1,
    144 	  "Intel PRO/100 VM Network Controller" },
    145 	{ PCI_PRODUCT_INTEL_PRO_100_VM_2,
    146 	  "Intel PRO/100 VM Network Controller" },
    147 	{ PCI_PRODUCT_INTEL_PRO_100_VM_3,
    148 	  "Intel PRO/100 VM Network Controller with 82562EM/EX PHY" },
    149 	{ PCI_PRODUCT_INTEL_PRO_100_VM_4,
    150 	  "Intel PRO/100 VM Network Controller with 82562EM/EX (CNR) PHY" },
    151 	{ PCI_PRODUCT_INTEL_PRO_100_VM_5,
    152 	  "Intel PRO/100 VM (MOB) Network Controller" },
    153 	{ PCI_PRODUCT_INTEL_PRO_100_VM_6,
    154 	  "Intel PRO/100 VM Network Controller with 82562ET/EZ PHY" },
    155 	{ PCI_PRODUCT_INTEL_PRO_100_M,
    156 	  "Intel PRO/100 M Network Controller" },
    157 	{ PCI_PRODUCT_INTEL_82801EB_LAN,
    158 	  "Intel 82801EB/ER (ICH5) Network Controller" },
    159 	{ PCI_PRODUCT_INTEL_82801FB_LAN,
    160 	  "Intel 82562EZ (ICH6)" },
    161 	{ PCI_PRODUCT_INTEL_82801G_LAN,
    162 	  "Intel 82801GB/GR (ICH7) Network Controller" },
    163 	{ PCI_PRODUCT_INTEL_82801GB_LAN,
    164 	  "Intel 82801GB 10/100 Network Controller" },
    165 	{ 0,
    166 	  NULL },
    167 };
    168 
    169 static const struct fxp_pci_product *
    170 fxp_pci_lookup(const struct pci_attach_args *pa)
    171 {
    172 	const struct fxp_pci_product *fpp;
    173 
    174 	if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_INTEL)
    175 		return (NULL);
    176 
    177 	for (fpp = fxp_pci_products; fpp->fpp_name != NULL; fpp++)
    178 		if (PCI_PRODUCT(pa->pa_id) == fpp->fpp_prodid)
    179 			return (fpp);
    180 
    181 	return (NULL);
    182 }
    183 
    184 static int
    185 fxp_pci_match(device_t parent, struct cfdata *match, void *aux)
    186 {
    187 	struct pci_attach_args *pa = aux;
    188 
    189 	if (fxp_pci_lookup(pa) != NULL)
    190 		return (1);
    191 
    192 	return (0);
    193 }
    194 
    195 /*
    196  * On resume : (XXX it is necessary with new pmf framework ?)
    197  * Restore PCI configuration registers that may have been clobbered.
    198  * This is necessary due to bugs on the Sony VAIO Z505-series on-board
    199  * ethernet, after an APM suspend/resume, as well as after an ACPI
    200  * D3->D0 transition.  We call this function from a power hook after
    201  * APM resume events, as well as after the ACPI D3->D0 transition.
    202  */
    203 static void
    204 fxp_pci_confreg_restore(struct fxp_pci_softc *psc)
    205 {
    206 	pcireg_t reg;
    207 
    208 #if 0
    209 	/*
    210 	 * Check to see if the command register is blank -- if so, then
    211 	 * we'll assume that all the clobberable-registers have been
    212 	 * clobbered.
    213 	 */
    214 
    215 	/*
    216 	 * In general, the above metric is accurate. Unfortunately,
    217 	 * it is inaccurate across a hibernation. Ideally APM/ACPI
    218 	 * code should take note of hibernation events and execute
    219 	 * a hibernation wakeup hook, but at present a hibernation wake
    220 	 * is indistinguishable from a suspend wake.
    221 	 */
    222 
    223 	if (((reg = pci_conf_read(psc->psc_pc, psc->psc_tag,
    224 	    PCI_COMMAND_STATUS_REG)) & 0xffff) != 0)
    225 		return;
    226 #else
    227 	reg = pci_conf_read(psc->psc_pc, psc->psc_tag, PCI_COMMAND_STATUS_REG);
    228 #endif
    229 
    230 	pci_conf_write(psc->psc_pc, psc->psc_tag,
    231 	    PCI_COMMAND_STATUS_REG,
    232 	    (reg & 0xffff0000) |
    233 	    (psc->psc_regs[PCI_COMMAND_STATUS_REG>>2] & 0xffff));
    234 	pci_conf_write(psc->psc_pc, psc->psc_tag, PCI_BHLC_REG,
    235 	    psc->psc_regs[PCI_BHLC_REG>>2]);
    236 	pci_conf_write(psc->psc_pc, psc->psc_tag, PCI_MAPREG_START+0x0,
    237 	    psc->psc_regs[(PCI_MAPREG_START+0x0)>>2]);
    238 	pci_conf_write(psc->psc_pc, psc->psc_tag, PCI_MAPREG_START+0x4,
    239 	    psc->psc_regs[(PCI_MAPREG_START+0x4)>>2]);
    240 	pci_conf_write(psc->psc_pc, psc->psc_tag, PCI_MAPREG_START+0x8,
    241 	    psc->psc_regs[(PCI_MAPREG_START+0x8)>>2]);
    242 }
    243 
    244 static bool
    245 fxp_pci_resume(device_t dv PMF_FN_ARGS)
    246 {
    247 	struct fxp_pci_softc *psc = device_private(dv);
    248 	fxp_pci_confreg_restore(psc);
    249 
    250 	return true;
    251 }
    252 
    253 static void
    254 fxp_pci_attach(device_t parent, device_t self, void *aux)
    255 {
    256 	struct fxp_pci_softc *psc = device_private(self);
    257 	struct fxp_softc *sc = &psc->psc_fxp;
    258 	struct pci_attach_args *pa = aux;
    259 	pci_chipset_tag_t pc = pa->pa_pc;
    260 	pci_intr_handle_t ih;
    261 	const struct fxp_pci_product *fpp;
    262 	const char *intrstr = NULL;
    263 	bus_space_tag_t iot, memt;
    264 	bus_space_handle_t ioh, memh;
    265 	int ioh_valid, memh_valid;
    266 	bus_addr_t addr;
    267 	bus_size_t size;
    268 	int flags;
    269 	int error;
    270 
    271 	aprint_naive(": Ethernet controller\n");
    272 
    273 	/*
    274 	 * Map control/status registers.
    275 	 */
    276 	ioh_valid = (pci_mapreg_map(pa, FXP_PCI_IOBA,
    277 	    PCI_MAPREG_TYPE_IO, 0,
    278 	    &iot, &ioh, NULL, NULL) == 0);
    279 
    280 	/*
    281 	 * Version 2.1 of the PCI spec, page 196, "Address Maps":
    282 	 *
    283 	 *	Prefetchable
    284 	 *
    285 	 *	Set to one if there are no side effects on reads, the
    286 	 *	device returns all bytes regardless of the byte enables,
    287 	 *	and host bridges can merge processor writes into this
    288 	 *	range without causing errors.  Bit must be set to zero
    289 	 *	otherwise.
    290 	 *
    291 	 * The 82557 incorrectly sets the "prefetchable" bit, resulting
    292 	 * in errors on systems which will do merged reads and writes.
    293 	 * These errors manifest themselves as all-bits-set when reading
    294 	 * from the EEPROM or other < 4 byte registers.
    295 	 *
    296 	 * We must work around this problem by always forcing the mapping
    297 	 * for memory space to be uncacheable.  On systems which cannot
    298 	 * create an uncacheable mapping (because the firmware mapped it
    299 	 * into only cacheable/prefetchable space due to the "prefetchable"
    300 	 * bit), we can fall back onto i/o mapped access.
    301 	 */
    302 	memh_valid = 0;
    303 	memt = pa->pa_memt;
    304 	if (((pa->pa_flags & PCI_FLAGS_MEM_ENABLED) != 0) &&
    305 	    pci_mapreg_info(pa->pa_pc, pa->pa_tag, FXP_PCI_MMBA,
    306 	    PCI_MAPREG_TYPE_MEM|PCI_MAPREG_MEM_TYPE_32BIT,
    307 	    &addr, &size, &flags) == 0) {
    308 		flags &= ~BUS_SPACE_MAP_PREFETCHABLE;
    309 		if (bus_space_map(memt, addr, size, flags, &memh) == 0)
    310 			memh_valid = 1;
    311 	}
    312 
    313 	if (memh_valid) {
    314 		sc->sc_st = memt;
    315 		sc->sc_sh = memh;
    316 	} else if (ioh_valid) {
    317 		sc->sc_st = iot;
    318 		sc->sc_sh = ioh;
    319 	} else {
    320 		aprint_error(": unable to map device registers\n");
    321 		return;
    322 	}
    323 
    324 	sc->sc_dmat = pa->pa_dmat;
    325 
    326 	fpp = fxp_pci_lookup(pa);
    327 	if (fpp == NULL) {
    328 		printf("\n");
    329 		panic("fxp_pci_attach: impossible");
    330 	}
    331 
    332 	sc->sc_rev = PCI_REVISION(pa->pa_class);
    333 
    334 	switch (fpp->fpp_prodid) {
    335 	case PCI_PRODUCT_INTEL_82557:
    336 	case PCI_PRODUCT_INTEL_82559ER:
    337 	case PCI_PRODUCT_INTEL_IN_BUSINESS:
    338 	    {
    339 		const char *chipname = NULL;
    340 
    341 		if (sc->sc_rev >= FXP_REV_82558_A4) {
    342 			chipname = "i82558 Ethernet";
    343 			/*
    344 			 * Enable the MWI command for memory writes.
    345 			 */
    346 			if (pa->pa_flags & PCI_FLAGS_MWI_OKAY)
    347 				sc->sc_flags |= FXPF_MWI;
    348 		}
    349 		if (sc->sc_rev >= FXP_REV_82559_A0)
    350 			chipname = "i82559 Ethernet";
    351 		if (sc->sc_rev >= FXP_REV_82559S_A)
    352 			chipname = "i82559S Ethernet";
    353 		if (sc->sc_rev >= FXP_REV_82550)
    354 			chipname = "i82550 Ethernet";
    355 
    356 		/*
    357 		 * Mark all i82559 and i82550 revisions as having
    358 		 * the "resume bug".  See i82557.c for details.
    359 		 */
    360 		if (sc->sc_rev >= FXP_REV_82559_A0)
    361 			sc->sc_flags |= FXPF_HAS_RESUME_BUG;
    362 
    363 		aprint_normal(": %s, rev %d\n", chipname != NULL ? chipname :
    364 		    fpp->fpp_name, sc->sc_rev);
    365 		break;
    366 	    }
    367 
    368 	case PCI_PRODUCT_INTEL_82801BA_LAN:
    369 		aprint_normal(": %s, rev %d\n", fpp->fpp_name, sc->sc_rev);
    370 
    371 		/*
    372 		 * The 82801BA Ethernet has a bug which requires us to send a
    373 		 * NOP before a CU_RESUME if we're in 10baseT mode.
    374 		 */
    375 		if (fpp->fpp_prodid == PCI_PRODUCT_INTEL_82801BA_LAN)
    376 			sc->sc_flags |= FXPF_HAS_RESUME_BUG;
    377 		break;
    378 
    379 	case PCI_PRODUCT_INTEL_PRO_100_VE_0:
    380 	case PCI_PRODUCT_INTEL_PRO_100_VE_1:
    381 	case PCI_PRODUCT_INTEL_PRO_100_VM_0:
    382 	case PCI_PRODUCT_INTEL_PRO_100_VM_1:
    383 	case PCI_PRODUCT_INTEL_82562EH_HPNA_0:
    384 	case PCI_PRODUCT_INTEL_82562EH_HPNA_1:
    385 	case PCI_PRODUCT_INTEL_82562EH_HPNA_2:
    386 	case PCI_PRODUCT_INTEL_PRO_100_VM_2:
    387 		aprint_normal(": %s, rev %d\n", fpp->fpp_name, sc->sc_rev);
    388 
    389 		/*
    390 		 * ICH3 chips apparently have problems with the enhanced
    391 		 * features, so just treat them as an i82557.  It also
    392 		 * has the resume bug that the ICH2 has.
    393 		 */
    394 		sc->sc_rev = 1;
    395 		sc->sc_flags |= FXPF_HAS_RESUME_BUG;
    396 		break;
    397 	case PCI_PRODUCT_INTEL_82801E_LAN_1:
    398 	case PCI_PRODUCT_INTEL_82801E_LAN_2:
    399 		aprint_normal(": %s, rev %d\n", fpp->fpp_name, sc->sc_rev);
    400 
    401 		/*
    402 		 *  XXX We have to read the C-ICH's developer's manual
    403 		 *  in detail
    404 		 */
    405 		break;
    406 	case PCI_PRODUCT_INTEL_PRO_100_VE_2:
    407 	case PCI_PRODUCT_INTEL_PRO_100_VE_3:
    408 	case PCI_PRODUCT_INTEL_PRO_100_VE_4:
    409 	case PCI_PRODUCT_INTEL_PRO_100_VE_5:
    410 	case PCI_PRODUCT_INTEL_PRO_100_VM_3:
    411 	case PCI_PRODUCT_INTEL_PRO_100_VM_4:
    412 	case PCI_PRODUCT_INTEL_PRO_100_VM_5:
    413 	case PCI_PRODUCT_INTEL_PRO_100_VM_6:
    414 	case PCI_PRODUCT_INTEL_82801EB_LAN:
    415 	case PCI_PRODUCT_INTEL_82801FB_LAN:
    416 	case PCI_PRODUCT_INTEL_82801G_LAN:
    417 	default:
    418 		aprint_normal(": %s, rev %d\n", fpp->fpp_name, sc->sc_rev);
    419 
    420 		/*
    421 		 * No particular quirks.
    422 		 */
    423 		break;
    424 	}
    425 
    426 	/* Make sure bus-mastering is enabled. */
    427 	pci_conf_write(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG,
    428 	    pci_conf_read(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG) |
    429 	    PCI_COMMAND_MASTER_ENABLE);
    430 
    431   	/*
    432 	 * Under some circumstances (such as APM suspend/resume
    433 	 * cycles, and across ACPI power state changes), the
    434 	 * i82257-family can lose the contents of critical PCI
    435 	 * configuration registers, causing the card to be
    436 	 * non-responsive and useless.  This occurs on the Sony VAIO
    437 	 * Z505-series, among others.  Preserve them here so they can
    438 	 * be later restored (by fxp_pci_confreg_restore()).
    439 	 */
    440 	psc->psc_pc = pc;
    441 	psc->psc_tag = pa->pa_tag;
    442 	psc->psc_regs[PCI_COMMAND_STATUS_REG>>2] =
    443 	    pci_conf_read(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);
    444 	psc->psc_regs[PCI_BHLC_REG>>2] =
    445 	    pci_conf_read(pc, pa->pa_tag, PCI_BHLC_REG);
    446 	psc->psc_regs[(PCI_MAPREG_START+0x0)>>2] =
    447 	    pci_conf_read(pc, pa->pa_tag, PCI_MAPREG_START+0x0);
    448 	psc->psc_regs[(PCI_MAPREG_START+0x4)>>2] =
    449 	    pci_conf_read(pc, pa->pa_tag, PCI_MAPREG_START+0x4);
    450 	psc->psc_regs[(PCI_MAPREG_START+0x8)>>2] =
    451 	    pci_conf_read(pc, pa->pa_tag, PCI_MAPREG_START+0x8);
    452 
    453 	/* power up chip */
    454 	switch ((error = pci_activate(pa->pa_pc, pa->pa_tag, self,
    455 	    pci_activate_null))) {
    456 	case EOPNOTSUPP:
    457 		break;
    458 	case 0:
    459 		sc->sc_enable = fxp_pci_enable;
    460 		sc->sc_disable = fxp_pci_disable;
    461 		break;
    462 	default:
    463 		aprint_error("%s: cannot activate %d\n", sc->sc_dev.dv_xname,
    464 		    error);
    465 		return;
    466 	}
    467 
    468 	/* Restore PCI configuration registers. */
    469 	fxp_pci_confreg_restore(psc);
    470 
    471 	sc->sc_enabled = 1;
    472 
    473 	/*
    474 	 * Map and establish our interrupt.
    475 	 */
    476 	if (pci_intr_map(pa, &ih)) {
    477 		aprint_error("%s: couldn't map interrupt\n",
    478 		    sc->sc_dev.dv_xname);
    479 		return;
    480 	}
    481 	intrstr = pci_intr_string(pc, ih);
    482 	sc->sc_ih = pci_intr_establish(pc, ih, IPL_NET, fxp_intr, sc);
    483 	if (sc->sc_ih == NULL) {
    484 		aprint_error("%s: couldn't establish interrupt",
    485 		    sc->sc_dev.dv_xname);
    486 		if (intrstr != NULL)
    487 			aprint_normal(" at %s", intrstr);
    488 		aprint_normal("\n");
    489 		return;
    490 	}
    491 	aprint_normal("%s: interrupting at %s\n", sc->sc_dev.dv_xname, intrstr);
    492 
    493 	/* Finish off the attach. */
    494 	fxp_attach(sc);
    495 	if (sc->sc_disable != NULL)
    496 		fxp_disable(sc);
    497 
    498 	/* Add a suspend hook to restore PCI config state */
    499 	if (!pmf_device_register(self, NULL, fxp_pci_resume))
    500 		aprint_error_dev(self, "couldn't establish power handler\n");
    501 	else
    502 		pmf_class_network_register(self, &sc->sc_ethercom.ec_if);
    503 }
    504 
    505 static int
    506 fxp_pci_enable(struct fxp_softc *sc)
    507 {
    508 	struct fxp_pci_softc *psc = (void *) sc;
    509 
    510 #if 0
    511 	printf("%s: going to power state D0\n", sc->sc_dev.dv_xname);
    512 #endif
    513 
    514 	/* Bring the device into D0 power state. */
    515 	pci_conf_write(psc->psc_pc, psc->psc_tag,
    516 	    psc->psc_pwrmgmt_csr_reg, psc->psc_pwrmgmt_csr);
    517 
    518 	/* Now restore the configuration registers. */
    519 	fxp_pci_confreg_restore(psc);
    520 
    521 	return (0);
    522 }
    523 
    524 static void
    525 fxp_pci_disable(struct fxp_softc *sc)
    526 {
    527 	struct fxp_pci_softc *psc = (void *) sc;
    528 
    529 	/*
    530 	 * for some 82558_A4 and 82558_B0, entering D3 state makes
    531 	 * media detection disordered.
    532 	 */
    533 	if (sc->sc_rev <= FXP_REV_82558_B0)
    534 		return;
    535 
    536 #if 0
    537 	printf("%s: going to power state D3\n", sc->sc_dev.dv_xname);
    538 #endif
    539 
    540 	/* Put the device into D3 state. */
    541 	pci_conf_write(psc->psc_pc, psc->psc_tag,
    542 	    psc->psc_pwrmgmt_csr_reg, (psc->psc_pwrmgmt_csr &
    543 	    ~PCI_PMCSR_STATE_MASK) | PCI_PMCSR_STATE_D3);
    544 }
    545