if_fxp.c revision 185276
1/*-
2 * Copyright (c) 1995, David Greenman
3 * Copyright (c) 2001 Jonathan Lemon <jlemon@freebsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice unmodified, this list of conditions, and the following
11 *    disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: head/sys/dev/fxp/if_fxp.c 185276 2008-11-25 02:05:01Z yongari $");
32
33/*
34 * Intel EtherExpress Pro/100B PCI Fast Ethernet driver
35 */
36
37#ifdef HAVE_KERNEL_OPTION_HEADERS
38#include "opt_device_polling.h"
39#endif
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/bus.h>
44#include <sys/endian.h>
45#include <sys/kernel.h>
46#include <sys/mbuf.h>
47#include <sys/module.h>
48#include <sys/rman.h>
49#include <sys/socket.h>
50#include <sys/sockio.h>
51#include <sys/sysctl.h>
52
53#include <net/bpf.h>
54#include <net/ethernet.h>
55#include <net/if.h>
56#include <net/if_arp.h>
57#include <net/if_dl.h>
58#include <net/if_media.h>
59#include <net/if_types.h>
60#include <net/if_vlan_var.h>
61
62#include <machine/bus.h>
63#include <machine/resource.h>
64
65#ifdef FXP_IP_CSUM_WAR
66#include <netinet/in.h>
67#include <netinet/in_systm.h>
68#include <netinet/ip.h>
69#include <machine/in_cksum.h>
70#endif
71
72#include <dev/pci/pcivar.h>
73#include <dev/pci/pcireg.h>		/* for PCIM_CMD_xxx */
74
75#include <dev/mii/mii.h>
76#include <dev/mii/miivar.h>
77
78#include <dev/fxp/if_fxpreg.h>
79#include <dev/fxp/if_fxpvar.h>
80#include <dev/fxp/rcvbundl.h>
81
82MODULE_DEPEND(fxp, pci, 1, 1, 1);
83MODULE_DEPEND(fxp, ether, 1, 1, 1);
84MODULE_DEPEND(fxp, miibus, 1, 1, 1);
85#include "miibus_if.h"
86
87/*
88 * NOTE!  On the Alpha, we have an alignment constraint.  The
89 * card DMAs the packet immediately following the RFA.  However,
90 * the first thing in the packet is a 14-byte Ethernet header.
91 * This means that the packet is misaligned.  To compensate,
92 * we actually offset the RFA 2 bytes into the cluster.  This
93 * alignes the packet after the Ethernet header at a 32-bit
94 * boundary.  HOWEVER!  This means that the RFA is misaligned!
95 */
96#define	RFA_ALIGNMENT_FUDGE	2
97
98/*
99 * Set initial transmit threshold at 64 (512 bytes). This is
100 * increased by 64 (512 bytes) at a time, to maximum of 192
101 * (1536 bytes), if an underrun occurs.
102 */
103static int tx_threshold = 64;
104
105/*
106 * The configuration byte map has several undefined fields which
107 * must be one or must be zero.  Set up a template for these bits
108 * only, (assuming a 82557 chip) leaving the actual configuration
109 * to fxp_init.
110 *
111 * See struct fxp_cb_config for the bit definitions.
112 */
113static u_char fxp_cb_config_template[] = {
114	0x0, 0x0,		/* cb_status */
115	0x0, 0x0,		/* cb_command */
116	0x0, 0x0, 0x0, 0x0,	/* link_addr */
117	0x0,	/*  0 */
118	0x0,	/*  1 */
119	0x0,	/*  2 */
120	0x0,	/*  3 */
121	0x0,	/*  4 */
122	0x0,	/*  5 */
123	0x32,	/*  6 */
124	0x0,	/*  7 */
125	0x0,	/*  8 */
126	0x0,	/*  9 */
127	0x6,	/* 10 */
128	0x0,	/* 11 */
129	0x0,	/* 12 */
130	0x0,	/* 13 */
131	0xf2,	/* 14 */
132	0x48,	/* 15 */
133	0x0,	/* 16 */
134	0x40,	/* 17 */
135	0xf0,	/* 18 */
136	0x0,	/* 19 */
137	0x3f,	/* 20 */
138	0x5	/* 21 */
139};
140
141struct fxp_ident {
142	uint16_t	devid;
143	int16_t		revid;		/* -1 matches anything */
144	char 		*name;
145};
146
147/*
148 * Claim various Intel PCI device identifiers for this driver.  The
149 * sub-vendor and sub-device field are extensively used to identify
150 * particular variants, but we don't currently differentiate between
151 * them.
152 */
153static struct fxp_ident fxp_ident_table[] = {
154    { 0x1029,	-1,	"Intel 82559 PCI/CardBus Pro/100" },
155    { 0x1030,	-1,	"Intel 82559 Pro/100 Ethernet" },
156    { 0x1031,	-1,	"Intel 82801CAM (ICH3) Pro/100 VE Ethernet" },
157    { 0x1032,	-1,	"Intel 82801CAM (ICH3) Pro/100 VE Ethernet" },
158    { 0x1033,	-1,	"Intel 82801CAM (ICH3) Pro/100 VM Ethernet" },
159    { 0x1034,	-1,	"Intel 82801CAM (ICH3) Pro/100 VM Ethernet" },
160    { 0x1035,	-1,	"Intel 82801CAM (ICH3) Pro/100 Ethernet" },
161    { 0x1036,	-1,	"Intel 82801CAM (ICH3) Pro/100 Ethernet" },
162    { 0x1037,	-1,	"Intel 82801CAM (ICH3) Pro/100 Ethernet" },
163    { 0x1038,	-1,	"Intel 82801CAM (ICH3) Pro/100 VM Ethernet" },
164    { 0x1039,	-1,	"Intel 82801DB (ICH4) Pro/100 VE Ethernet" },
165    { 0x103A,	-1,	"Intel 82801DB (ICH4) Pro/100 Ethernet" },
166    { 0x103B,	-1,	"Intel 82801DB (ICH4) Pro/100 VM Ethernet" },
167    { 0x103C,	-1,	"Intel 82801DB (ICH4) Pro/100 Ethernet" },
168    { 0x103D,	-1,	"Intel 82801DB (ICH4) Pro/100 VE Ethernet" },
169    { 0x103E,	-1,	"Intel 82801DB (ICH4) Pro/100 VM Ethernet" },
170    { 0x1050,	-1,	"Intel 82801BA (D865) Pro/100 VE Ethernet" },
171    { 0x1051,	-1,	"Intel 82562ET (ICH5/ICH5R) Pro/100 VE Ethernet" },
172    { 0x1059,	-1,	"Intel 82551QM Pro/100 M Mobile Connection" },
173    { 0x1064,	-1,	"Intel 82562EZ (ICH6)" },
174    { 0x1065,	-1,	"Intel 82562ET/EZ/GT/GZ PRO/100 VE Ethernet" },
175    { 0x1068,	-1,	"Intel 82801FBM (ICH6-M) Pro/100 VE Ethernet" },
176    { 0x1069,	-1,	"Intel 82562EM/EX/GX Pro/100 Ethernet" },
177    { 0x1091,	-1,	"Intel 82562GX Pro/100 Ethernet" },
178    { 0x1092,	-1,	"Intel Pro/100 VE Network Connection" },
179    { 0x1093,	-1,	"Intel Pro/100 VM Network Connection" },
180    { 0x1094,	-1,	"Intel Pro/100 946GZ (ICH7) Network Connection" },
181    { 0x1209,	-1,	"Intel 82559ER Embedded 10/100 Ethernet" },
182    { 0x1229,	0x01,	"Intel 82557 Pro/100 Ethernet" },
183    { 0x1229,	0x02,	"Intel 82557 Pro/100 Ethernet" },
184    { 0x1229,	0x03,	"Intel 82557 Pro/100 Ethernet" },
185    { 0x1229,	0x04,	"Intel 82558 Pro/100 Ethernet" },
186    { 0x1229,	0x05,	"Intel 82558 Pro/100 Ethernet" },
187    { 0x1229,	0x06,	"Intel 82559 Pro/100 Ethernet" },
188    { 0x1229,	0x07,	"Intel 82559 Pro/100 Ethernet" },
189    { 0x1229,	0x08,	"Intel 82559 Pro/100 Ethernet" },
190    { 0x1229,	0x09,	"Intel 82559ER Pro/100 Ethernet" },
191    { 0x1229,	0x0c,	"Intel 82550 Pro/100 Ethernet" },
192    { 0x1229,	0x0d,	"Intel 82550 Pro/100 Ethernet" },
193    { 0x1229,	0x0e,	"Intel 82550 Pro/100 Ethernet" },
194    { 0x1229,	0x0f,	"Intel 82551 Pro/100 Ethernet" },
195    { 0x1229,	0x10,	"Intel 82551 Pro/100 Ethernet" },
196    { 0x1229,	-1,	"Intel 82557/8/9 Pro/100 Ethernet" },
197    { 0x2449,	-1,	"Intel 82801BA/CAM (ICH2/3) Pro/100 Ethernet" },
198    { 0x27dc,	-1,	"Intel 82801GB (ICH7) 10/100 Ethernet" },
199    { 0,	-1,	NULL },
200};
201
202#ifdef FXP_IP_CSUM_WAR
203#define FXP_CSUM_FEATURES    (CSUM_IP | CSUM_TCP | CSUM_UDP)
204#else
205#define FXP_CSUM_FEATURES    (CSUM_TCP | CSUM_UDP)
206#endif
207
208static int		fxp_probe(device_t dev);
209static int		fxp_attach(device_t dev);
210static int		fxp_detach(device_t dev);
211static int		fxp_shutdown(device_t dev);
212static int		fxp_suspend(device_t dev);
213static int		fxp_resume(device_t dev);
214
215static void		fxp_intr(void *xsc);
216static void		fxp_intr_body(struct fxp_softc *sc, struct ifnet *ifp,
217			    uint8_t statack, int count);
218static void 		fxp_init(void *xsc);
219static void 		fxp_init_body(struct fxp_softc *sc);
220static void 		fxp_tick(void *xsc);
221static void 		fxp_start(struct ifnet *ifp);
222static void 		fxp_start_body(struct ifnet *ifp);
223static int		fxp_encap(struct fxp_softc *sc, struct mbuf *m_head);
224static void		fxp_stop(struct fxp_softc *sc);
225static void 		fxp_release(struct fxp_softc *sc);
226static int		fxp_ioctl(struct ifnet *ifp, u_long command,
227			    caddr_t data);
228static void 		fxp_watchdog(struct fxp_softc *sc);
229static int		fxp_add_rfabuf(struct fxp_softc *sc,
230    			    struct fxp_rx *rxp, struct mbuf *oldm);
231static int		fxp_mc_addrs(struct fxp_softc *sc);
232static void		fxp_mc_setup(struct fxp_softc *sc);
233static uint16_t		fxp_eeprom_getword(struct fxp_softc *sc, int offset,
234			    int autosize);
235static void 		fxp_eeprom_putword(struct fxp_softc *sc, int offset,
236			    uint16_t data);
237static void		fxp_autosize_eeprom(struct fxp_softc *sc);
238static void		fxp_read_eeprom(struct fxp_softc *sc, u_short *data,
239			    int offset, int words);
240static void		fxp_write_eeprom(struct fxp_softc *sc, u_short *data,
241			    int offset, int words);
242static int		fxp_ifmedia_upd(struct ifnet *ifp);
243static void		fxp_ifmedia_sts(struct ifnet *ifp,
244			    struct ifmediareq *ifmr);
245static int		fxp_serial_ifmedia_upd(struct ifnet *ifp);
246static void		fxp_serial_ifmedia_sts(struct ifnet *ifp,
247			    struct ifmediareq *ifmr);
248static int		fxp_miibus_readreg(device_t dev, int phy, int reg);
249static void		fxp_miibus_writereg(device_t dev, int phy, int reg,
250			    int value);
251static void		fxp_load_ucode(struct fxp_softc *sc);
252static int		sysctl_int_range(SYSCTL_HANDLER_ARGS,
253			    int low, int high);
254static int		sysctl_hw_fxp_bundle_max(SYSCTL_HANDLER_ARGS);
255static int		sysctl_hw_fxp_int_delay(SYSCTL_HANDLER_ARGS);
256static void 		fxp_scb_wait(struct fxp_softc *sc);
257static void		fxp_scb_cmd(struct fxp_softc *sc, int cmd);
258static void		fxp_dma_wait(struct fxp_softc *sc,
259    			    volatile uint16_t *status, bus_dma_tag_t dmat,
260			    bus_dmamap_t map);
261
262static device_method_t fxp_methods[] = {
263	/* Device interface */
264	DEVMETHOD(device_probe,		fxp_probe),
265	DEVMETHOD(device_attach,	fxp_attach),
266	DEVMETHOD(device_detach,	fxp_detach),
267	DEVMETHOD(device_shutdown,	fxp_shutdown),
268	DEVMETHOD(device_suspend,	fxp_suspend),
269	DEVMETHOD(device_resume,	fxp_resume),
270
271	/* MII interface */
272	DEVMETHOD(miibus_readreg,	fxp_miibus_readreg),
273	DEVMETHOD(miibus_writereg,	fxp_miibus_writereg),
274
275	{ 0, 0 }
276};
277
278static driver_t fxp_driver = {
279	"fxp",
280	fxp_methods,
281	sizeof(struct fxp_softc),
282};
283
284static devclass_t fxp_devclass;
285
286DRIVER_MODULE(fxp, pci, fxp_driver, fxp_devclass, 0, 0);
287DRIVER_MODULE(fxp, cardbus, fxp_driver, fxp_devclass, 0, 0);
288DRIVER_MODULE(miibus, fxp, miibus_driver, miibus_devclass, 0, 0);
289
290static struct resource_spec fxp_res_spec_mem[] = {
291	{ SYS_RES_MEMORY,	FXP_PCI_MMBA,	RF_ACTIVE },
292	{ SYS_RES_IRQ,		0,		RF_ACTIVE | RF_SHAREABLE },
293	{ -1, 0 }
294};
295
296static struct resource_spec fxp_res_spec_io[] = {
297	{ SYS_RES_IOPORT,	FXP_PCI_IOBA,	RF_ACTIVE },
298	{ SYS_RES_IRQ,		0,		RF_ACTIVE | RF_SHAREABLE },
299	{ -1, 0 }
300};
301
302/*
303 * Wait for the previous command to be accepted (but not necessarily
304 * completed).
305 */
306static void
307fxp_scb_wait(struct fxp_softc *sc)
308{
309	union {
310		uint16_t w;
311		uint8_t b[2];
312	} flowctl;
313	int i = 10000;
314
315	while (CSR_READ_1(sc, FXP_CSR_SCB_COMMAND) && --i)
316		DELAY(2);
317	if (i == 0) {
318		flowctl.b[0] = CSR_READ_1(sc, FXP_CSR_FLOWCONTROL);
319		flowctl.b[1] = CSR_READ_1(sc, FXP_CSR_FLOWCONTROL + 1);
320		device_printf(sc->dev, "SCB timeout: 0x%x 0x%x 0x%x 0x%x\n",
321		    CSR_READ_1(sc, FXP_CSR_SCB_COMMAND),
322		    CSR_READ_1(sc, FXP_CSR_SCB_STATACK),
323		    CSR_READ_1(sc, FXP_CSR_SCB_RUSCUS), flowctl.w);
324	}
325}
326
327static void
328fxp_scb_cmd(struct fxp_softc *sc, int cmd)
329{
330
331	if (cmd == FXP_SCB_COMMAND_CU_RESUME && sc->cu_resume_bug) {
332		CSR_WRITE_1(sc, FXP_CSR_SCB_COMMAND, FXP_CB_COMMAND_NOP);
333		fxp_scb_wait(sc);
334	}
335	CSR_WRITE_1(sc, FXP_CSR_SCB_COMMAND, cmd);
336}
337
338static void
339fxp_dma_wait(struct fxp_softc *sc, volatile uint16_t *status,
340    bus_dma_tag_t dmat, bus_dmamap_t map)
341{
342	int i = 10000;
343
344	bus_dmamap_sync(dmat, map, BUS_DMASYNC_POSTREAD);
345	while (!(le16toh(*status) & FXP_CB_STATUS_C) && --i) {
346		DELAY(2);
347		bus_dmamap_sync(dmat, map, BUS_DMASYNC_POSTREAD);
348	}
349	if (i == 0)
350		device_printf(sc->dev, "DMA timeout\n");
351}
352
353/*
354 * Return identification string if this device is ours.
355 */
356static int
357fxp_probe(device_t dev)
358{
359	uint16_t devid;
360	uint8_t revid;
361	struct fxp_ident *ident;
362
363	if (pci_get_vendor(dev) == FXP_VENDORID_INTEL) {
364		devid = pci_get_device(dev);
365		revid = pci_get_revid(dev);
366		for (ident = fxp_ident_table; ident->name != NULL; ident++) {
367			if (ident->devid == devid &&
368			    (ident->revid == revid || ident->revid == -1)) {
369				device_set_desc(dev, ident->name);
370				return (BUS_PROBE_DEFAULT);
371			}
372		}
373	}
374	return (ENXIO);
375}
376
377static void
378fxp_dma_map_addr(void *arg, bus_dma_segment_t *segs, int nseg, int error)
379{
380	uint32_t *addr;
381
382	if (error)
383		return;
384
385	KASSERT(nseg == 1, ("too many DMA segments, %d should be 1", nseg));
386	addr = arg;
387	*addr = segs->ds_addr;
388}
389
390static int
391fxp_attach(device_t dev)
392{
393	struct fxp_softc *sc;
394	struct fxp_cb_tx *tcbp;
395	struct fxp_tx *txp;
396	struct fxp_rx *rxp;
397	struct ifnet *ifp;
398	uint32_t val;
399	uint16_t data, myea[ETHER_ADDR_LEN / 2];
400	u_char eaddr[ETHER_ADDR_LEN];
401	int i, prefer_iomap;
402	int error;
403
404	error = 0;
405	sc = device_get_softc(dev);
406	sc->dev = dev;
407	mtx_init(&sc->sc_mtx, device_get_nameunit(dev), MTX_NETWORK_LOCK,
408	    MTX_DEF);
409	callout_init_mtx(&sc->stat_ch, &sc->sc_mtx, 0);
410	ifmedia_init(&sc->sc_media, 0, fxp_serial_ifmedia_upd,
411	    fxp_serial_ifmedia_sts);
412
413	ifp = sc->ifp = if_alloc(IFT_ETHER);
414	if (ifp == NULL) {
415		device_printf(dev, "can not if_alloc()\n");
416		error = ENOSPC;
417		goto fail;
418	}
419
420	/*
421	 * Enable bus mastering.
422	 */
423	pci_enable_busmaster(dev);
424	val = pci_read_config(dev, PCIR_COMMAND, 2);
425
426	/*
427	 * Figure out which we should try first - memory mapping or i/o mapping?
428	 * We default to memory mapping. Then we accept an override from the
429	 * command line. Then we check to see which one is enabled.
430	 */
431	prefer_iomap = 0;
432	resource_int_value(device_get_name(dev), device_get_unit(dev),
433	    "prefer_iomap", &prefer_iomap);
434	if (prefer_iomap)
435		sc->fxp_spec = fxp_res_spec_io;
436	else
437		sc->fxp_spec = fxp_res_spec_mem;
438
439	error = bus_alloc_resources(dev, sc->fxp_spec, sc->fxp_res);
440	if (error) {
441		if (sc->fxp_spec == fxp_res_spec_mem)
442			sc->fxp_spec = fxp_res_spec_io;
443		else
444			sc->fxp_spec = fxp_res_spec_mem;
445		error = bus_alloc_resources(dev, sc->fxp_spec, sc->fxp_res);
446	}
447	if (error) {
448		device_printf(dev, "could not allocate resources\n");
449		error = ENXIO;
450		goto fail;
451	}
452
453	if (bootverbose) {
454		device_printf(dev, "using %s space register mapping\n",
455		   sc->fxp_spec == fxp_res_spec_mem ? "memory" : "I/O");
456	}
457
458	/*
459	 * Reset to a stable state.
460	 */
461	CSR_WRITE_4(sc, FXP_CSR_PORT, FXP_PORT_SELECTIVE_RESET);
462	DELAY(10);
463
464	/*
465	 * Find out how large of an SEEPROM we have.
466	 */
467	fxp_autosize_eeprom(sc);
468
469	/*
470	 * Find out the chip revision; lump all 82557 revs together.
471	 */
472	fxp_read_eeprom(sc, &data, 5, 1);
473	if ((data >> 8) == 1)
474		sc->revision = FXP_REV_82557;
475	else
476		sc->revision = pci_get_revid(dev);
477
478	/*
479	 * Determine whether we must use the 503 serial interface.
480	 */
481	fxp_read_eeprom(sc, &data, 6, 1);
482	if (sc->revision == FXP_REV_82557 && (data & FXP_PHY_DEVICE_MASK) != 0
483	    && (data & FXP_PHY_SERIAL_ONLY))
484		sc->flags |= FXP_FLAG_SERIAL_MEDIA;
485
486	SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
487	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
488	    OID_AUTO, "int_delay", CTLTYPE_INT | CTLFLAG_RW,
489	    &sc->tunable_int_delay, 0, sysctl_hw_fxp_int_delay, "I",
490	    "FXP driver receive interrupt microcode bundling delay");
491	SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
492	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
493	    OID_AUTO, "bundle_max", CTLTYPE_INT | CTLFLAG_RW,
494	    &sc->tunable_bundle_max, 0, sysctl_hw_fxp_bundle_max, "I",
495	    "FXP driver receive interrupt microcode bundle size limit");
496	SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
497	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
498	    OID_AUTO, "rnr", CTLFLAG_RD, &sc->rnr, 0,
499	    "FXP RNR events");
500	SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
501	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
502	    OID_AUTO, "noflow", CTLFLAG_RW, &sc->tunable_noflow, 0,
503	    "FXP flow control disabled");
504
505	/*
506	 * Pull in device tunables.
507	 */
508	sc->tunable_int_delay = TUNABLE_INT_DELAY;
509	sc->tunable_bundle_max = TUNABLE_BUNDLE_MAX;
510	sc->tunable_noflow = 1;
511	(void) resource_int_value(device_get_name(dev), device_get_unit(dev),
512	    "int_delay", &sc->tunable_int_delay);
513	(void) resource_int_value(device_get_name(dev), device_get_unit(dev),
514	    "bundle_max", &sc->tunable_bundle_max);
515	(void) resource_int_value(device_get_name(dev), device_get_unit(dev),
516	    "noflow", &sc->tunable_noflow);
517	sc->rnr = 0;
518
519	/*
520	 * Enable workarounds for certain chip revision deficiencies.
521	 *
522	 * Systems based on the ICH2/ICH2-M chip from Intel, and possibly
523	 * some systems based a normal 82559 design, have a defect where
524	 * the chip can cause a PCI protocol violation if it receives
525	 * a CU_RESUME command when it is entering the IDLE state.  The
526	 * workaround is to disable Dynamic Standby Mode, so the chip never
527	 * deasserts CLKRUN#, and always remains in an active state.
528	 *
529	 * See Intel 82801BA/82801BAM Specification Update, Errata #30.
530	 */
531	i = pci_get_device(dev);
532	if (i == 0x2449 || (i > 0x1030 && i < 0x1039) ||
533	    sc->revision >= FXP_REV_82559_A0) {
534		fxp_read_eeprom(sc, &data, 10, 1);
535		if (data & 0x02) {			/* STB enable */
536			uint16_t cksum;
537			int i;
538
539			device_printf(dev,
540			    "Disabling dynamic standby mode in EEPROM\n");
541			data &= ~0x02;
542			fxp_write_eeprom(sc, &data, 10, 1);
543			device_printf(dev, "New EEPROM ID: 0x%x\n", data);
544			cksum = 0;
545			for (i = 0; i < (1 << sc->eeprom_size) - 1; i++) {
546				fxp_read_eeprom(sc, &data, i, 1);
547				cksum += data;
548			}
549			i = (1 << sc->eeprom_size) - 1;
550			cksum = 0xBABA - cksum;
551			fxp_read_eeprom(sc, &data, i, 1);
552			fxp_write_eeprom(sc, &cksum, i, 1);
553			device_printf(dev,
554			    "EEPROM checksum @ 0x%x: 0x%x -> 0x%x\n",
555			    i, data, cksum);
556#if 1
557			/*
558			 * If the user elects to continue, try the software
559			 * workaround, as it is better than nothing.
560			 */
561			sc->flags |= FXP_FLAG_CU_RESUME_BUG;
562#endif
563		}
564	}
565
566	/*
567	 * If we are not a 82557 chip, we can enable extended features.
568	 */
569	if (sc->revision != FXP_REV_82557) {
570		/*
571		 * If MWI is enabled in the PCI configuration, and there
572		 * is a valid cacheline size (8 or 16 dwords), then tell
573		 * the board to turn on MWI.
574		 */
575		if (val & PCIM_CMD_MWRICEN &&
576		    pci_read_config(dev, PCIR_CACHELNSZ, 1) != 0)
577			sc->flags |= FXP_FLAG_MWI_ENABLE;
578
579		/* turn on the extended TxCB feature */
580		sc->flags |= FXP_FLAG_EXT_TXCB;
581
582		/* enable reception of long frames for VLAN */
583		sc->flags |= FXP_FLAG_LONG_PKT_EN;
584	} else {
585		/* a hack to get long VLAN frames on a 82557 */
586		sc->flags |= FXP_FLAG_SAVE_BAD;
587	}
588
589	/*
590	 * Enable use of extended RFDs and TCBs for 82550
591	 * and later chips. Note: we need extended TXCB support
592	 * too, but that's already enabled by the code above.
593	 * Be careful to do this only on the right devices.
594	 */
595	if (sc->revision == FXP_REV_82550 || sc->revision == FXP_REV_82550_C ||
596	    sc->revision == FXP_REV_82551_E || sc->revision == FXP_REV_82551_F
597	    || sc->revision == FXP_REV_82551_10) {
598		sc->rfa_size = sizeof (struct fxp_rfa);
599		sc->tx_cmd = FXP_CB_COMMAND_IPCBXMIT;
600		sc->flags |= FXP_FLAG_EXT_RFA;
601	} else {
602		sc->rfa_size = sizeof (struct fxp_rfa) - FXP_RFAX_LEN;
603		sc->tx_cmd = FXP_CB_COMMAND_XMIT;
604	}
605
606	/*
607	 * Allocate DMA tags and DMA safe memory.
608	 */
609	sc->maxtxseg = FXP_NTXSEG;
610	if (sc->flags & FXP_FLAG_EXT_RFA)
611		sc->maxtxseg--;
612	error = bus_dma_tag_create(bus_get_dma_tag(dev), 2, 0,
613	    BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
614	    MCLBYTES * sc->maxtxseg, sc->maxtxseg, MCLBYTES, 0,
615	    busdma_lock_mutex, &Giant, &sc->fxp_mtag);
616	if (error) {
617		device_printf(dev, "could not allocate dma tag\n");
618		goto fail;
619	}
620
621	error = bus_dma_tag_create(bus_get_dma_tag(dev), 4, 0,
622	    BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
623	    sizeof(struct fxp_stats), 1, sizeof(struct fxp_stats), 0,
624	    busdma_lock_mutex, &Giant, &sc->fxp_stag);
625	if (error) {
626		device_printf(dev, "could not allocate dma tag\n");
627		goto fail;
628	}
629
630	error = bus_dmamem_alloc(sc->fxp_stag, (void **)&sc->fxp_stats,
631	    BUS_DMA_NOWAIT | BUS_DMA_ZERO, &sc->fxp_smap);
632	if (error)
633		goto fail;
634	error = bus_dmamap_load(sc->fxp_stag, sc->fxp_smap, sc->fxp_stats,
635	    sizeof(struct fxp_stats), fxp_dma_map_addr, &sc->stats_addr, 0);
636	if (error) {
637		device_printf(dev, "could not map the stats buffer\n");
638		goto fail;
639	}
640
641	error = bus_dma_tag_create(bus_get_dma_tag(dev), 4, 0,
642	    BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
643	    FXP_TXCB_SZ, 1, FXP_TXCB_SZ, 0,
644	    busdma_lock_mutex, &Giant, &sc->cbl_tag);
645	if (error) {
646		device_printf(dev, "could not allocate dma tag\n");
647		goto fail;
648	}
649
650	error = bus_dmamem_alloc(sc->cbl_tag, (void **)&sc->fxp_desc.cbl_list,
651	    BUS_DMA_NOWAIT | BUS_DMA_ZERO, &sc->cbl_map);
652	if (error)
653		goto fail;
654
655	error = bus_dmamap_load(sc->cbl_tag, sc->cbl_map,
656	    sc->fxp_desc.cbl_list, FXP_TXCB_SZ, fxp_dma_map_addr,
657	    &sc->fxp_desc.cbl_addr, 0);
658	if (error) {
659		device_printf(dev, "could not map DMA memory\n");
660		goto fail;
661	}
662
663	error = bus_dma_tag_create(bus_get_dma_tag(dev), 4, 0,
664	    BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
665	    sizeof(struct fxp_cb_mcs), 1, sizeof(struct fxp_cb_mcs), 0,
666	    busdma_lock_mutex, &Giant, &sc->mcs_tag);
667	if (error) {
668		device_printf(dev, "could not allocate dma tag\n");
669		goto fail;
670	}
671
672	error = bus_dmamem_alloc(sc->mcs_tag, (void **)&sc->mcsp,
673	    BUS_DMA_NOWAIT, &sc->mcs_map);
674	if (error)
675		goto fail;
676	error = bus_dmamap_load(sc->mcs_tag, sc->mcs_map, sc->mcsp,
677	    sizeof(struct fxp_cb_mcs), fxp_dma_map_addr, &sc->mcs_addr, 0);
678	if (error) {
679		device_printf(dev, "can't map the multicast setup command\n");
680		goto fail;
681	}
682
683	/*
684	 * Pre-allocate the TX DMA maps and setup the pointers to
685	 * the TX command blocks.
686	 */
687	txp = sc->fxp_desc.tx_list;
688	tcbp = sc->fxp_desc.cbl_list;
689	for (i = 0; i < FXP_NTXCB; i++) {
690		txp[i].tx_cb = tcbp + i;
691		error = bus_dmamap_create(sc->fxp_mtag, 0, &txp[i].tx_map);
692		if (error) {
693			device_printf(dev, "can't create DMA map for TX\n");
694			goto fail;
695		}
696	}
697	error = bus_dmamap_create(sc->fxp_mtag, 0, &sc->spare_map);
698	if (error) {
699		device_printf(dev, "can't create spare DMA map\n");
700		goto fail;
701	}
702
703	/*
704	 * Pre-allocate our receive buffers.
705	 */
706	sc->fxp_desc.rx_head = sc->fxp_desc.rx_tail = NULL;
707	for (i = 0; i < FXP_NRFABUFS; i++) {
708		rxp = &sc->fxp_desc.rx_list[i];
709		error = bus_dmamap_create(sc->fxp_mtag, 0, &rxp->rx_map);
710		if (error) {
711			device_printf(dev, "can't create DMA map for RX\n");
712			goto fail;
713		}
714		if (fxp_add_rfabuf(sc, rxp, NULL) != 0) {
715			error = ENOMEM;
716			goto fail;
717		}
718	}
719
720	/*
721	 * Read MAC address.
722	 */
723	fxp_read_eeprom(sc, myea, 0, 3);
724	eaddr[0] = myea[0] & 0xff;
725	eaddr[1] = myea[0] >> 8;
726	eaddr[2] = myea[1] & 0xff;
727	eaddr[3] = myea[1] >> 8;
728	eaddr[4] = myea[2] & 0xff;
729	eaddr[5] = myea[2] >> 8;
730	if (bootverbose) {
731		device_printf(dev, "PCI IDs: %04x %04x %04x %04x %04x\n",
732		    pci_get_vendor(dev), pci_get_device(dev),
733		    pci_get_subvendor(dev), pci_get_subdevice(dev),
734		    pci_get_revid(dev));
735		fxp_read_eeprom(sc, &data, 10, 1);
736		device_printf(dev, "Dynamic Standby mode is %s\n",
737		    data & 0x02 ? "enabled" : "disabled");
738	}
739
740	/*
741	 * If this is only a 10Mbps device, then there is no MII, and
742	 * the PHY will use a serial interface instead.
743	 *
744	 * The Seeq 80c24 AutoDUPLEX(tm) Ethernet Interface Adapter
745	 * doesn't have a programming interface of any sort.  The
746	 * media is sensed automatically based on how the link partner
747	 * is configured.  This is, in essence, manual configuration.
748	 */
749	if (sc->flags & FXP_FLAG_SERIAL_MEDIA) {
750		ifmedia_add(&sc->sc_media, IFM_ETHER|IFM_MANUAL, 0, NULL);
751		ifmedia_set(&sc->sc_media, IFM_ETHER|IFM_MANUAL);
752	} else {
753		if (mii_phy_probe(dev, &sc->miibus, fxp_ifmedia_upd,
754		    fxp_ifmedia_sts)) {
755	                device_printf(dev, "MII without any PHY!\n");
756			error = ENXIO;
757			goto fail;
758		}
759	}
760
761	if_initname(ifp, device_get_name(dev), device_get_unit(dev));
762	ifp->if_init = fxp_init;
763	ifp->if_softc = sc;
764	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
765	ifp->if_ioctl = fxp_ioctl;
766	ifp->if_start = fxp_start;
767
768	ifp->if_capabilities = ifp->if_capenable = 0;
769
770	/* Enable checksum offload for 82550 or better chips */
771	if (sc->flags & FXP_FLAG_EXT_RFA) {
772		ifp->if_hwassist = FXP_CSUM_FEATURES;
773		ifp->if_capabilities |= IFCAP_HWCSUM;
774		ifp->if_capenable |= IFCAP_HWCSUM;
775	}
776
777#ifdef DEVICE_POLLING
778	/* Inform the world we support polling. */
779	ifp->if_capabilities |= IFCAP_POLLING;
780#endif
781
782	/*
783	 * Attach the interface.
784	 */
785	ether_ifattach(ifp, eaddr);
786
787	/*
788	 * Tell the upper layer(s) we support long frames.
789	 * Must appear after the call to ether_ifattach() because
790	 * ether_ifattach() sets ifi_hdrlen to the default value.
791	 */
792	ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header);
793	ifp->if_capabilities |= IFCAP_VLAN_MTU;
794	ifp->if_capenable |= IFCAP_VLAN_MTU; /* the hw bits already set */
795
796	/*
797	 * Let the system queue as many packets as we have available
798	 * TX descriptors.
799	 */
800	IFQ_SET_MAXLEN(&ifp->if_snd, FXP_NTXCB - 1);
801	ifp->if_snd.ifq_drv_maxlen = FXP_NTXCB - 1;
802	IFQ_SET_READY(&ifp->if_snd);
803
804	/*
805	 * Hook our interrupt after all initialization is complete.
806	 */
807	error = bus_setup_intr(dev, sc->fxp_res[1], INTR_TYPE_NET | INTR_MPSAFE,
808			       NULL, fxp_intr, sc, &sc->ih);
809	if (error) {
810		device_printf(dev, "could not setup irq\n");
811		ether_ifdetach(sc->ifp);
812		goto fail;
813	}
814
815fail:
816	if (error)
817		fxp_release(sc);
818	return (error);
819}
820
821/*
822 * Release all resources.  The softc lock should not be held and the
823 * interrupt should already be torn down.
824 */
825static void
826fxp_release(struct fxp_softc *sc)
827{
828	struct fxp_rx *rxp;
829	struct fxp_tx *txp;
830	int i;
831
832	FXP_LOCK_ASSERT(sc, MA_NOTOWNED);
833	KASSERT(sc->ih == NULL,
834	    ("fxp_release() called with intr handle still active"));
835	if (sc->miibus)
836		device_delete_child(sc->dev, sc->miibus);
837	bus_generic_detach(sc->dev);
838	ifmedia_removeall(&sc->sc_media);
839	if (sc->fxp_desc.cbl_list) {
840		bus_dmamap_unload(sc->cbl_tag, sc->cbl_map);
841		bus_dmamem_free(sc->cbl_tag, sc->fxp_desc.cbl_list,
842		    sc->cbl_map);
843	}
844	if (sc->fxp_stats) {
845		bus_dmamap_unload(sc->fxp_stag, sc->fxp_smap);
846		bus_dmamem_free(sc->fxp_stag, sc->fxp_stats, sc->fxp_smap);
847	}
848	if (sc->mcsp) {
849		bus_dmamap_unload(sc->mcs_tag, sc->mcs_map);
850		bus_dmamem_free(sc->mcs_tag, sc->mcsp, sc->mcs_map);
851	}
852	bus_release_resources(sc->dev, sc->fxp_spec, sc->fxp_res);
853	if (sc->fxp_mtag) {
854		for (i = 0; i < FXP_NRFABUFS; i++) {
855			rxp = &sc->fxp_desc.rx_list[i];
856			if (rxp->rx_mbuf != NULL) {
857				bus_dmamap_sync(sc->fxp_mtag, rxp->rx_map,
858				    BUS_DMASYNC_POSTREAD);
859				bus_dmamap_unload(sc->fxp_mtag, rxp->rx_map);
860				m_freem(rxp->rx_mbuf);
861			}
862			bus_dmamap_destroy(sc->fxp_mtag, rxp->rx_map);
863		}
864		bus_dmamap_destroy(sc->fxp_mtag, sc->spare_map);
865		for (i = 0; i < FXP_NTXCB; i++) {
866			txp = &sc->fxp_desc.tx_list[i];
867			if (txp->tx_mbuf != NULL) {
868				bus_dmamap_sync(sc->fxp_mtag, txp->tx_map,
869				    BUS_DMASYNC_POSTWRITE);
870				bus_dmamap_unload(sc->fxp_mtag, txp->tx_map);
871				m_freem(txp->tx_mbuf);
872			}
873			bus_dmamap_destroy(sc->fxp_mtag, txp->tx_map);
874		}
875		bus_dma_tag_destroy(sc->fxp_mtag);
876	}
877	if (sc->fxp_stag)
878		bus_dma_tag_destroy(sc->fxp_stag);
879	if (sc->cbl_tag)
880		bus_dma_tag_destroy(sc->cbl_tag);
881	if (sc->mcs_tag)
882		bus_dma_tag_destroy(sc->mcs_tag);
883	if (sc->ifp)
884		if_free(sc->ifp);
885
886	mtx_destroy(&sc->sc_mtx);
887}
888
889/*
890 * Detach interface.
891 */
892static int
893fxp_detach(device_t dev)
894{
895	struct fxp_softc *sc = device_get_softc(dev);
896
897#ifdef DEVICE_POLLING
898	if (sc->ifp->if_capenable & IFCAP_POLLING)
899		ether_poll_deregister(sc->ifp);
900#endif
901
902	FXP_LOCK(sc);
903	sc->suspended = 1;	/* Do same thing as we do for suspend */
904	/*
905	 * Stop DMA and drop transmit queue, but disable interrupts first.
906	 */
907	CSR_WRITE_1(sc, FXP_CSR_SCB_INTRCNTL, FXP_SCB_INTR_DISABLE);
908	fxp_stop(sc);
909	FXP_UNLOCK(sc);
910	callout_drain(&sc->stat_ch);
911
912	/*
913	 * Close down routes etc.
914	 */
915	ether_ifdetach(sc->ifp);
916
917	/*
918	 * Unhook interrupt before dropping lock. This is to prevent
919	 * races with fxp_intr().
920	 */
921	bus_teardown_intr(sc->dev, sc->fxp_res[1], sc->ih);
922	sc->ih = NULL;
923
924	/* Release our allocated resources. */
925	fxp_release(sc);
926	return (0);
927}
928
929/*
930 * Device shutdown routine. Called at system shutdown after sync. The
931 * main purpose of this routine is to shut off receiver DMA so that
932 * kernel memory doesn't get clobbered during warmboot.
933 */
934static int
935fxp_shutdown(device_t dev)
936{
937	struct fxp_softc *sc = device_get_softc(dev);
938
939	/*
940	 * Make sure that DMA is disabled prior to reboot. Not doing
941	 * do could allow DMA to corrupt kernel memory during the
942	 * reboot before the driver initializes.
943	 */
944	FXP_LOCK(sc);
945	fxp_stop(sc);
946	FXP_UNLOCK(sc);
947	return (0);
948}
949
950/*
951 * Device suspend routine.  Stop the interface and save some PCI
952 * settings in case the BIOS doesn't restore them properly on
953 * resume.
954 */
955static int
956fxp_suspend(device_t dev)
957{
958	struct fxp_softc *sc = device_get_softc(dev);
959
960	FXP_LOCK(sc);
961
962	fxp_stop(sc);
963
964	sc->suspended = 1;
965
966	FXP_UNLOCK(sc);
967	return (0);
968}
969
970/*
971 * Device resume routine. re-enable busmastering, and restart the interface if
972 * appropriate.
973 */
974static int
975fxp_resume(device_t dev)
976{
977	struct fxp_softc *sc = device_get_softc(dev);
978	struct ifnet *ifp = sc->ifp;
979
980	FXP_LOCK(sc);
981
982	CSR_WRITE_4(sc, FXP_CSR_PORT, FXP_PORT_SELECTIVE_RESET);
983	DELAY(10);
984
985	/* reinitialize interface if necessary */
986	if (ifp->if_flags & IFF_UP)
987		fxp_init_body(sc);
988
989	sc->suspended = 0;
990
991	FXP_UNLOCK(sc);
992	return (0);
993}
994
995static void
996fxp_eeprom_shiftin(struct fxp_softc *sc, int data, int length)
997{
998	uint16_t reg;
999	int x;
1000
1001	/*
1002	 * Shift in data.
1003	 */
1004	for (x = 1 << (length - 1); x; x >>= 1) {
1005		if (data & x)
1006			reg = FXP_EEPROM_EECS | FXP_EEPROM_EEDI;
1007		else
1008			reg = FXP_EEPROM_EECS;
1009		CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, reg);
1010		DELAY(1);
1011		CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, reg | FXP_EEPROM_EESK);
1012		DELAY(1);
1013		CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, reg);
1014		DELAY(1);
1015	}
1016}
1017
1018/*
1019 * Read from the serial EEPROM. Basically, you manually shift in
1020 * the read opcode (one bit at a time) and then shift in the address,
1021 * and then you shift out the data (all of this one bit at a time).
1022 * The word size is 16 bits, so you have to provide the address for
1023 * every 16 bits of data.
1024 */
1025static uint16_t
1026fxp_eeprom_getword(struct fxp_softc *sc, int offset, int autosize)
1027{
1028	uint16_t reg, data;
1029	int x;
1030
1031	CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, FXP_EEPROM_EECS);
1032	/*
1033	 * Shift in read opcode.
1034	 */
1035	fxp_eeprom_shiftin(sc, FXP_EEPROM_OPC_READ, 3);
1036	/*
1037	 * Shift in address.
1038	 */
1039	data = 0;
1040	for (x = 1 << (sc->eeprom_size - 1); x; x >>= 1) {
1041		if (offset & x)
1042			reg = FXP_EEPROM_EECS | FXP_EEPROM_EEDI;
1043		else
1044			reg = FXP_EEPROM_EECS;
1045		CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, reg);
1046		DELAY(1);
1047		CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, reg | FXP_EEPROM_EESK);
1048		DELAY(1);
1049		CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, reg);
1050		DELAY(1);
1051		reg = CSR_READ_2(sc, FXP_CSR_EEPROMCONTROL) & FXP_EEPROM_EEDO;
1052		data++;
1053		if (autosize && reg == 0) {
1054			sc->eeprom_size = data;
1055			break;
1056		}
1057	}
1058	/*
1059	 * Shift out data.
1060	 */
1061	data = 0;
1062	reg = FXP_EEPROM_EECS;
1063	for (x = 1 << 15; x; x >>= 1) {
1064		CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, reg | FXP_EEPROM_EESK);
1065		DELAY(1);
1066		if (CSR_READ_2(sc, FXP_CSR_EEPROMCONTROL) & FXP_EEPROM_EEDO)
1067			data |= x;
1068		CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, reg);
1069		DELAY(1);
1070	}
1071	CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, 0);
1072	DELAY(1);
1073
1074	return (data);
1075}
1076
1077static void
1078fxp_eeprom_putword(struct fxp_softc *sc, int offset, uint16_t data)
1079{
1080	int i;
1081
1082	/*
1083	 * Erase/write enable.
1084	 */
1085	CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, FXP_EEPROM_EECS);
1086	fxp_eeprom_shiftin(sc, 0x4, 3);
1087	fxp_eeprom_shiftin(sc, 0x03 << (sc->eeprom_size - 2), sc->eeprom_size);
1088	CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, 0);
1089	DELAY(1);
1090	/*
1091	 * Shift in write opcode, address, data.
1092	 */
1093	CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, FXP_EEPROM_EECS);
1094	fxp_eeprom_shiftin(sc, FXP_EEPROM_OPC_WRITE, 3);
1095	fxp_eeprom_shiftin(sc, offset, sc->eeprom_size);
1096	fxp_eeprom_shiftin(sc, data, 16);
1097	CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, 0);
1098	DELAY(1);
1099	/*
1100	 * Wait for EEPROM to finish up.
1101	 */
1102	CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, FXP_EEPROM_EECS);
1103	DELAY(1);
1104	for (i = 0; i < 1000; i++) {
1105		if (CSR_READ_2(sc, FXP_CSR_EEPROMCONTROL) & FXP_EEPROM_EEDO)
1106			break;
1107		DELAY(50);
1108	}
1109	CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, 0);
1110	DELAY(1);
1111	/*
1112	 * Erase/write disable.
1113	 */
1114	CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, FXP_EEPROM_EECS);
1115	fxp_eeprom_shiftin(sc, 0x4, 3);
1116	fxp_eeprom_shiftin(sc, 0, sc->eeprom_size);
1117	CSR_WRITE_2(sc, FXP_CSR_EEPROMCONTROL, 0);
1118	DELAY(1);
1119}
1120
1121/*
1122 * From NetBSD:
1123 *
1124 * Figure out EEPROM size.
1125 *
1126 * 559's can have either 64-word or 256-word EEPROMs, the 558
1127 * datasheet only talks about 64-word EEPROMs, and the 557 datasheet
1128 * talks about the existance of 16 to 256 word EEPROMs.
1129 *
1130 * The only known sizes are 64 and 256, where the 256 version is used
1131 * by CardBus cards to store CIS information.
1132 *
1133 * The address is shifted in msb-to-lsb, and after the last
1134 * address-bit the EEPROM is supposed to output a `dummy zero' bit,
1135 * after which follows the actual data. We try to detect this zero, by
1136 * probing the data-out bit in the EEPROM control register just after
1137 * having shifted in a bit. If the bit is zero, we assume we've
1138 * shifted enough address bits. The data-out should be tri-state,
1139 * before this, which should translate to a logical one.
1140 */
1141static void
1142fxp_autosize_eeprom(struct fxp_softc *sc)
1143{
1144
1145	/* guess maximum size of 256 words */
1146	sc->eeprom_size = 8;
1147
1148	/* autosize */
1149	(void) fxp_eeprom_getword(sc, 0, 1);
1150}
1151
1152static void
1153fxp_read_eeprom(struct fxp_softc *sc, u_short *data, int offset, int words)
1154{
1155	int i;
1156
1157	for (i = 0; i < words; i++)
1158		data[i] = fxp_eeprom_getword(sc, offset + i, 0);
1159}
1160
1161static void
1162fxp_write_eeprom(struct fxp_softc *sc, u_short *data, int offset, int words)
1163{
1164	int i;
1165
1166	for (i = 0; i < words; i++)
1167		fxp_eeprom_putword(sc, offset + i, data[i]);
1168}
1169
1170/*
1171 * Grab the softc lock and call the real fxp_start_body() routine
1172 */
1173static void
1174fxp_start(struct ifnet *ifp)
1175{
1176	struct fxp_softc *sc = ifp->if_softc;
1177
1178	FXP_LOCK(sc);
1179	fxp_start_body(ifp);
1180	FXP_UNLOCK(sc);
1181}
1182
1183/*
1184 * Start packet transmission on the interface.
1185 * This routine must be called with the softc lock held, and is an
1186 * internal entry point only.
1187 */
1188static void
1189fxp_start_body(struct ifnet *ifp)
1190{
1191	struct fxp_softc *sc = ifp->if_softc;
1192	struct mbuf *mb_head;
1193	int error, txqueued;
1194
1195	FXP_LOCK_ASSERT(sc, MA_OWNED);
1196
1197	/*
1198	 * See if we need to suspend xmit until the multicast filter
1199	 * has been reprogrammed (which can only be done at the head
1200	 * of the command chain).
1201	 */
1202	if (sc->need_mcsetup)
1203		return;
1204
1205	/*
1206	 * We're finished if there is nothing more to add to the list or if
1207	 * we're all filled up with buffers to transmit.
1208	 * NOTE: One TxCB is reserved to guarantee that fxp_mc_setup() can add
1209	 *       a NOP command when needed.
1210	 */
1211	txqueued = 0;
1212	while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd) &&
1213	    sc->tx_queued < FXP_NTXCB - 1) {
1214
1215		/*
1216		 * Grab a packet to transmit.
1217		 */
1218		IFQ_DRV_DEQUEUE(&ifp->if_snd, mb_head);
1219		if (mb_head == NULL)
1220			break;
1221
1222		error = fxp_encap(sc, mb_head);
1223		if (error)
1224			break;
1225		txqueued = 1;
1226	}
1227	bus_dmamap_sync(sc->cbl_tag, sc->cbl_map, BUS_DMASYNC_PREWRITE);
1228
1229	/*
1230	 * We're finished. If we added to the list, issue a RESUME to get DMA
1231	 * going again if suspended.
1232	 */
1233	if (txqueued) {
1234		fxp_scb_wait(sc);
1235		fxp_scb_cmd(sc, FXP_SCB_COMMAND_CU_RESUME);
1236	}
1237}
1238
1239static int
1240fxp_encap(struct fxp_softc *sc, struct mbuf *m_head)
1241{
1242	struct ifnet *ifp;
1243	struct mbuf *m;
1244	struct fxp_tx *txp;
1245	struct fxp_cb_tx *cbp;
1246	bus_dma_segment_t segs[FXP_NTXSEG];
1247	int chainlen, error, i, nseg;
1248
1249	FXP_LOCK_ASSERT(sc, MA_OWNED);
1250	ifp = sc->ifp;
1251
1252	/*
1253	 * Get pointer to next available tx desc.
1254	 */
1255	txp = sc->fxp_desc.tx_last->tx_next;
1256
1257	/*
1258	 * A note in Appendix B of the Intel 8255x 10/100 Mbps
1259	 * Ethernet Controller Family Open Source Software
1260	 * Developer Manual says:
1261	 *   Using software parsing is only allowed with legal
1262	 *   TCP/IP or UDP/IP packets.
1263	 *   ...
1264	 *   For all other datagrams, hardware parsing must
1265	 *   be used.
1266	 * Software parsing appears to truncate ICMP and
1267	 * fragmented UDP packets that contain one to three
1268	 * bytes in the second (and final) mbuf of the packet.
1269	 */
1270	if (sc->flags & FXP_FLAG_EXT_RFA)
1271		txp->tx_cb->ipcb_ip_activation_high =
1272		    FXP_IPCB_HARDWAREPARSING_ENABLE;
1273
1274	/*
1275	 * Deal with TCP/IP checksum offload. Note that
1276	 * in order for TCP checksum offload to work,
1277	 * the pseudo header checksum must have already
1278	 * been computed and stored in the checksum field
1279	 * in the TCP header. The stack should have
1280	 * already done this for us.
1281	 */
1282	if (m_head->m_pkthdr.csum_flags) {
1283		if (m_head->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
1284			txp->tx_cb->ipcb_ip_schedule =
1285			    FXP_IPCB_TCPUDP_CHECKSUM_ENABLE;
1286			if (m_head->m_pkthdr.csum_flags & CSUM_TCP)
1287				txp->tx_cb->ipcb_ip_schedule |=
1288				    FXP_IPCB_TCP_PACKET;
1289		}
1290
1291#ifdef FXP_IP_CSUM_WAR
1292		/*
1293		 * XXX The 82550 chip appears to have trouble
1294		 * dealing with IP header checksums in very small
1295		 * datagrams, namely fragments from 1 to 3 bytes
1296		 * in size. For example, say you want to transmit
1297		 * a UDP packet of 1473 bytes. The packet will be
1298		 * fragmented over two IP datagrams, the latter
1299		 * containing only one byte of data. The 82550 will
1300		 * botch the header checksum on the 1-byte fragment.
1301		 * As long as the datagram contains 4 or more bytes
1302		 * of data, you're ok.
1303		 *
1304                 * The following code attempts to work around this
1305		 * problem: if the datagram is less than 38 bytes
1306		 * in size (14 bytes ether header, 20 bytes IP header,
1307		 * plus 4 bytes of data), we punt and compute the IP
1308		 * header checksum by hand. This workaround doesn't
1309		 * work very well, however, since it can be fooled
1310		 * by things like VLAN tags and IP options that make
1311		 * the header sizes/offsets vary.
1312		 */
1313
1314		if (m_head->m_pkthdr.csum_flags & CSUM_IP) {
1315			if (m_head->m_pkthdr.len < 38) {
1316				struct ip *ip;
1317				m_head->m_data += ETHER_HDR_LEN;
1318				ip = mtod(m_head, struct ip *);
1319				ip->ip_sum = in_cksum(m_head, ip->ip_hl << 2);
1320				m_head->m_data -= ETHER_HDR_LEN;
1321			} else {
1322				txp->tx_cb->ipcb_ip_activation_high =
1323				    FXP_IPCB_HARDWAREPARSING_ENABLE;
1324				txp->tx_cb->ipcb_ip_schedule |=
1325				    FXP_IPCB_IP_CHECKSUM_ENABLE;
1326			}
1327		}
1328#endif
1329	}
1330
1331	chainlen = 0;
1332	for (m = m_head; m != NULL && chainlen <= sc->maxtxseg; m = m->m_next)
1333		chainlen++;
1334	if (chainlen > sc->maxtxseg) {
1335		struct mbuf *mn;
1336
1337		/*
1338		 * We ran out of segments. We have to recopy this
1339		 * mbuf chain first. Bail out if we can't get the
1340		 * new buffers.
1341		 */
1342		mn = m_defrag(m_head, M_DONTWAIT);
1343		if (mn == NULL) {
1344			m_freem(m_head);
1345			return (-1);
1346		} else {
1347			m_head = mn;
1348		}
1349	}
1350
1351	/*
1352	 * Go through each of the mbufs in the chain and initialize
1353	 * the transmit buffer descriptors with the physical address
1354	 * and size of the mbuf.
1355	 */
1356	error = bus_dmamap_load_mbuf_sg(sc->fxp_mtag, txp->tx_map,
1357	    m_head, segs, &nseg, 0);
1358	if (error) {
1359		device_printf(sc->dev, "can't map mbuf (error %d)\n", error);
1360		m_freem(m_head);
1361		return (-1);
1362	}
1363
1364	KASSERT(nseg <= sc->maxtxseg, ("too many DMA segments"));
1365
1366	cbp = txp->tx_cb;
1367	for (i = 0; i < nseg; i++) {
1368		KASSERT(segs[i].ds_len <= MCLBYTES, ("segment size too large"));
1369		/*
1370		 * If this is an 82550/82551, then we're using extended
1371		 * TxCBs _and_ we're using checksum offload. This means
1372		 * that the TxCB is really an IPCB. One major difference
1373		 * between the two is that with plain extended TxCBs,
1374		 * the bottom half of the TxCB contains two entries from
1375		 * the TBD array, whereas IPCBs contain just one entry:
1376		 * one entry (8 bytes) has been sacrificed for the TCP/IP
1377		 * checksum offload control bits. So to make things work
1378		 * right, we have to start filling in the TBD array
1379		 * starting from a different place depending on whether
1380		 * the chip is an 82550/82551 or not.
1381		 */
1382		if (sc->flags & FXP_FLAG_EXT_RFA) {
1383			cbp->tbd[i + 1].tb_addr = htole32(segs[i].ds_addr);
1384			cbp->tbd[i + 1].tb_size = htole32(segs[i].ds_len);
1385		} else {
1386			cbp->tbd[i].tb_addr = htole32(segs[i].ds_addr);
1387			cbp->tbd[i].tb_size = htole32(segs[i].ds_len);
1388		}
1389	}
1390	cbp->tbd_number = nseg;
1391
1392	bus_dmamap_sync(sc->fxp_mtag, txp->tx_map, BUS_DMASYNC_PREWRITE);
1393	txp->tx_mbuf = m_head;
1394	txp->tx_cb->cb_status = 0;
1395	txp->tx_cb->byte_count = 0;
1396	if (sc->tx_queued != FXP_CXINT_THRESH - 1) {
1397		txp->tx_cb->cb_command =
1398		    htole16(sc->tx_cmd | FXP_CB_COMMAND_SF |
1399		    FXP_CB_COMMAND_S);
1400	} else {
1401		txp->tx_cb->cb_command =
1402		    htole16(sc->tx_cmd | FXP_CB_COMMAND_SF |
1403		    FXP_CB_COMMAND_S | FXP_CB_COMMAND_I);
1404		/*
1405		 * Set a 5 second timer just in case we don't hear
1406		 * from the card again.
1407		 */
1408		sc->watchdog_timer = 5;
1409	}
1410	txp->tx_cb->tx_threshold = tx_threshold;
1411
1412	/*
1413	 * Advance the end of list forward.
1414	 */
1415
1416#ifdef __alpha__
1417	/*
1418	 * On platforms which can't access memory in 16-bit
1419	 * granularities, we must prevent the card from DMA'ing
1420	 * up the status while we update the command field.
1421	 * This could cause us to overwrite the completion status.
1422	 * XXX This is probably bogus and we're _not_ looking
1423	 * for atomicity here.
1424	 */
1425	atomic_clear_16(&sc->fxp_desc.tx_last->tx_cb->cb_command,
1426	    htole16(FXP_CB_COMMAND_S));
1427#else
1428	sc->fxp_desc.tx_last->tx_cb->cb_command &= htole16(~FXP_CB_COMMAND_S);
1429#endif /*__alpha__*/
1430	sc->fxp_desc.tx_last = txp;
1431
1432	/*
1433	 * Advance the beginning of the list forward if there are
1434	 * no other packets queued (when nothing is queued, tx_first
1435	 * sits on the last TxCB that was sent out).
1436	 */
1437	if (sc->tx_queued == 0)
1438		sc->fxp_desc.tx_first = txp;
1439
1440	sc->tx_queued++;
1441
1442	/*
1443	 * Pass packet to bpf if there is a listener.
1444	 */
1445	BPF_MTAP(ifp, m_head);
1446	return (0);
1447}
1448
1449#ifdef DEVICE_POLLING
1450static poll_handler_t fxp_poll;
1451
1452static void
1453fxp_poll(struct ifnet *ifp, enum poll_cmd cmd, int count)
1454{
1455	struct fxp_softc *sc = ifp->if_softc;
1456	uint8_t statack;
1457
1458	FXP_LOCK(sc);
1459	if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
1460		FXP_UNLOCK(sc);
1461		return;
1462	}
1463
1464	statack = FXP_SCB_STATACK_CXTNO | FXP_SCB_STATACK_CNA |
1465	    FXP_SCB_STATACK_FR;
1466	if (cmd == POLL_AND_CHECK_STATUS) {
1467		uint8_t tmp;
1468
1469		tmp = CSR_READ_1(sc, FXP_CSR_SCB_STATACK);
1470		if (tmp == 0xff || tmp == 0) {
1471			FXP_UNLOCK(sc);
1472			return; /* nothing to do */
1473		}
1474		tmp &= ~statack;
1475		/* ack what we can */
1476		if (tmp != 0)
1477			CSR_WRITE_1(sc, FXP_CSR_SCB_STATACK, tmp);
1478		statack |= tmp;
1479	}
1480	fxp_intr_body(sc, ifp, statack, count);
1481	FXP_UNLOCK(sc);
1482}
1483#endif /* DEVICE_POLLING */
1484
1485/*
1486 * Process interface interrupts.
1487 */
1488static void
1489fxp_intr(void *xsc)
1490{
1491	struct fxp_softc *sc = xsc;
1492	struct ifnet *ifp = sc->ifp;
1493	uint8_t statack;
1494
1495	FXP_LOCK(sc);
1496	if (sc->suspended) {
1497		FXP_UNLOCK(sc);
1498		return;
1499	}
1500
1501#ifdef DEVICE_POLLING
1502	if (ifp->if_capenable & IFCAP_POLLING) {
1503		FXP_UNLOCK(sc);
1504		return;
1505	}
1506#endif
1507	while ((statack = CSR_READ_1(sc, FXP_CSR_SCB_STATACK)) != 0) {
1508		/*
1509		 * It should not be possible to have all bits set; the
1510		 * FXP_SCB_INTR_SWI bit always returns 0 on a read.  If
1511		 * all bits are set, this may indicate that the card has
1512		 * been physically ejected, so ignore it.
1513		 */
1514		if (statack == 0xff) {
1515			FXP_UNLOCK(sc);
1516			return;
1517		}
1518
1519		/*
1520		 * First ACK all the interrupts in this pass.
1521		 */
1522		CSR_WRITE_1(sc, FXP_CSR_SCB_STATACK, statack);
1523		fxp_intr_body(sc, ifp, statack, -1);
1524	}
1525	FXP_UNLOCK(sc);
1526}
1527
1528static void
1529fxp_txeof(struct fxp_softc *sc)
1530{
1531	struct fxp_tx *txp;
1532
1533	bus_dmamap_sync(sc->cbl_tag, sc->cbl_map, BUS_DMASYNC_PREREAD);
1534	for (txp = sc->fxp_desc.tx_first; sc->tx_queued &&
1535	    (le16toh(txp->tx_cb->cb_status) & FXP_CB_STATUS_C) != 0;
1536	    txp = txp->tx_next) {
1537		if (txp->tx_mbuf != NULL) {
1538			bus_dmamap_sync(sc->fxp_mtag, txp->tx_map,
1539			    BUS_DMASYNC_POSTWRITE);
1540			bus_dmamap_unload(sc->fxp_mtag, txp->tx_map);
1541			m_freem(txp->tx_mbuf);
1542			txp->tx_mbuf = NULL;
1543			/* clear this to reset csum offload bits */
1544			txp->tx_cb->tbd[0].tb_addr = 0;
1545		}
1546		sc->tx_queued--;
1547	}
1548	sc->fxp_desc.tx_first = txp;
1549	bus_dmamap_sync(sc->cbl_tag, sc->cbl_map, BUS_DMASYNC_PREWRITE);
1550	if (sc->tx_queued == 0) {
1551		sc->watchdog_timer = 0;
1552		if (sc->need_mcsetup)
1553			fxp_mc_setup(sc);
1554	}
1555}
1556
1557static void
1558fxp_intr_body(struct fxp_softc *sc, struct ifnet *ifp, uint8_t statack,
1559    int count)
1560{
1561	struct mbuf *m;
1562	struct fxp_rx *rxp;
1563	struct fxp_rfa *rfa;
1564	int rnr = (statack & FXP_SCB_STATACK_RNR) ? 1 : 0;
1565	int fxp_rc = 0;
1566	uint16_t status;
1567
1568	FXP_LOCK_ASSERT(sc, MA_OWNED);
1569	if (rnr)
1570		sc->rnr++;
1571#ifdef DEVICE_POLLING
1572	/* Pick up a deferred RNR condition if `count' ran out last time. */
1573	if (sc->flags & FXP_FLAG_DEFERRED_RNR) {
1574		sc->flags &= ~FXP_FLAG_DEFERRED_RNR;
1575		rnr = 1;
1576	}
1577#endif
1578
1579	/*
1580	 * Free any finished transmit mbuf chains.
1581	 *
1582	 * Handle the CNA event likt a CXTNO event. It used to
1583	 * be that this event (control unit not ready) was not
1584	 * encountered, but it is now with the SMPng modifications.
1585	 * The exact sequence of events that occur when the interface
1586	 * is brought up are different now, and if this event
1587	 * goes unhandled, the configuration/rxfilter setup sequence
1588	 * can stall for several seconds. The result is that no
1589	 * packets go out onto the wire for about 5 to 10 seconds
1590	 * after the interface is ifconfig'ed for the first time.
1591	 */
1592	if (statack & (FXP_SCB_STATACK_CXTNO | FXP_SCB_STATACK_CNA)) {
1593		fxp_txeof(sc);
1594
1595		/*
1596		 * Try to start more packets transmitting.
1597		 */
1598		if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
1599			fxp_start_body(ifp);
1600	}
1601
1602	/*
1603	 * Just return if nothing happened on the receive side.
1604	 */
1605	if (!rnr && (statack & FXP_SCB_STATACK_FR) == 0)
1606		return;
1607
1608	/*
1609	 * Process receiver interrupts. If a no-resource (RNR)
1610	 * condition exists, get whatever packets we can and
1611	 * re-start the receiver.
1612	 *
1613	 * When using polling, we do not process the list to completion,
1614	 * so when we get an RNR interrupt we must defer the restart
1615	 * until we hit the last buffer with the C bit set.
1616	 * If we run out of cycles and rfa_headm has the C bit set,
1617	 * record the pending RNR in the FXP_FLAG_DEFERRED_RNR flag so
1618	 * that the info will be used in the subsequent polling cycle.
1619	 */
1620	for (;;) {
1621		rxp = sc->fxp_desc.rx_head;
1622		m = rxp->rx_mbuf;
1623		rfa = (struct fxp_rfa *)(m->m_ext.ext_buf +
1624		    RFA_ALIGNMENT_FUDGE);
1625		bus_dmamap_sync(sc->fxp_mtag, rxp->rx_map,
1626		    BUS_DMASYNC_POSTREAD);
1627
1628#ifdef DEVICE_POLLING /* loop at most count times if count >=0 */
1629		if (count >= 0 && count-- == 0) {
1630			if (rnr) {
1631				/* Defer RNR processing until the next time. */
1632				sc->flags |= FXP_FLAG_DEFERRED_RNR;
1633				rnr = 0;
1634			}
1635			break;
1636		}
1637#endif /* DEVICE_POLLING */
1638
1639		status = le16toh(rfa->rfa_status);
1640		if ((status & FXP_RFA_STATUS_C) == 0)
1641			break;
1642
1643		/*
1644		 * Advance head forward.
1645		 */
1646		sc->fxp_desc.rx_head = rxp->rx_next;
1647
1648		/*
1649		 * Add a new buffer to the receive chain.
1650		 * If this fails, the old buffer is recycled
1651		 * instead.
1652		 */
1653		fxp_rc = fxp_add_rfabuf(sc, rxp, m);
1654		if (fxp_rc == 0) {
1655			int total_len;
1656
1657			/*
1658			 * Fetch packet length (the top 2 bits of
1659			 * actual_size are flags set by the controller
1660			 * upon completion), and drop the packet in case
1661			 * of bogus length or CRC errors.
1662			 */
1663			total_len = le16toh(rfa->actual_size) & 0x3fff;
1664			if (total_len < sizeof(struct ether_header) ||
1665			    total_len > MCLBYTES - RFA_ALIGNMENT_FUDGE -
1666				sc->rfa_size || status & FXP_RFA_STATUS_CRC) {
1667				m_freem(m);
1668				continue;
1669			}
1670
1671                        /* Do IP checksum checking. */
1672			if ((ifp->if_capenable & IFCAP_RXCSUM) != 0 &&
1673			    (status & FXP_RFA_STATUS_PARSE)) {
1674				if (rfa->rfax_csum_sts &
1675				    FXP_RFDX_CS_IP_CSUM_BIT_VALID)
1676					m->m_pkthdr.csum_flags |=
1677					    CSUM_IP_CHECKED;
1678				if (rfa->rfax_csum_sts &
1679				    FXP_RFDX_CS_IP_CSUM_VALID)
1680					m->m_pkthdr.csum_flags |=
1681					    CSUM_IP_VALID;
1682				if ((rfa->rfax_csum_sts &
1683				    FXP_RFDX_CS_TCPUDP_CSUM_BIT_VALID) &&
1684				    (rfa->rfax_csum_sts &
1685				    FXP_RFDX_CS_TCPUDP_CSUM_VALID)) {
1686					m->m_pkthdr.csum_flags |=
1687					    CSUM_DATA_VALID|CSUM_PSEUDO_HDR;
1688					m->m_pkthdr.csum_data = 0xffff;
1689				}
1690			}
1691
1692			m->m_pkthdr.len = m->m_len = total_len;
1693			m->m_pkthdr.rcvif = ifp;
1694
1695			/*
1696			 * Drop locks before calling if_input() since it
1697			 * may re-enter fxp_start() in the netisr case.
1698			 * This would result in a lock reversal.  Better
1699			 * performance might be obtained by chaining all
1700			 * packets received, dropping the lock, and then
1701			 * calling if_input() on each one.
1702			 */
1703			FXP_UNLOCK(sc);
1704			(*ifp->if_input)(ifp, m);
1705			FXP_LOCK(sc);
1706		} else if (fxp_rc == ENOBUFS) {
1707			rnr = 0;
1708			break;
1709		}
1710	}
1711	if (rnr) {
1712		fxp_scb_wait(sc);
1713		CSR_WRITE_4(sc, FXP_CSR_SCB_GENERAL,
1714		    sc->fxp_desc.rx_head->rx_addr);
1715		fxp_scb_cmd(sc, FXP_SCB_COMMAND_RU_START);
1716	}
1717}
1718
1719/*
1720 * Update packet in/out/collision statistics. The i82557 doesn't
1721 * allow you to access these counters without doing a fairly
1722 * expensive DMA to get _all_ of the statistics it maintains, so
1723 * we do this operation here only once per second. The statistics
1724 * counters in the kernel are updated from the previous dump-stats
1725 * DMA and then a new dump-stats DMA is started. The on-chip
1726 * counters are zeroed when the DMA completes. If we can't start
1727 * the DMA immediately, we don't wait - we just prepare to read
1728 * them again next time.
1729 */
1730static void
1731fxp_tick(void *xsc)
1732{
1733	struct fxp_softc *sc = xsc;
1734	struct ifnet *ifp = sc->ifp;
1735	struct fxp_stats *sp = sc->fxp_stats;
1736
1737	FXP_LOCK_ASSERT(sc, MA_OWNED);
1738	bus_dmamap_sync(sc->fxp_stag, sc->fxp_smap, BUS_DMASYNC_POSTREAD);
1739	ifp->if_opackets += le32toh(sp->tx_good);
1740	ifp->if_collisions += le32toh(sp->tx_total_collisions);
1741	if (sp->rx_good) {
1742		ifp->if_ipackets += le32toh(sp->rx_good);
1743		sc->rx_idle_secs = 0;
1744	} else {
1745		/*
1746		 * Receiver's been idle for another second.
1747		 */
1748		sc->rx_idle_secs++;
1749	}
1750	ifp->if_ierrors +=
1751	    le32toh(sp->rx_crc_errors) +
1752	    le32toh(sp->rx_alignment_errors) +
1753	    le32toh(sp->rx_rnr_errors) +
1754	    le32toh(sp->rx_overrun_errors);
1755	/*
1756	 * If any transmit underruns occured, bump up the transmit
1757	 * threshold by another 512 bytes (64 * 8).
1758	 */
1759	if (sp->tx_underruns) {
1760		ifp->if_oerrors += le32toh(sp->tx_underruns);
1761		if (tx_threshold < 192)
1762			tx_threshold += 64;
1763	}
1764
1765	/*
1766	 * Release any xmit buffers that have completed DMA. This isn't
1767	 * strictly necessary to do here, but it's advantagous for mbufs
1768	 * with external storage to be released in a timely manner rather
1769	 * than being defered for a potentially long time. This limits
1770	 * the delay to a maximum of one second.
1771	 */
1772	fxp_txeof(sc);
1773
1774	/*
1775	 * If we haven't received any packets in FXP_MAC_RX_IDLE seconds,
1776	 * then assume the receiver has locked up and attempt to clear
1777	 * the condition by reprogramming the multicast filter. This is
1778	 * a work-around for a bug in the 82557 where the receiver locks
1779	 * up if it gets certain types of garbage in the syncronization
1780	 * bits prior to the packet header. This bug is supposed to only
1781	 * occur in 10Mbps mode, but has been seen to occur in 100Mbps
1782	 * mode as well (perhaps due to a 10/100 speed transition).
1783	 */
1784	if (sc->rx_idle_secs > FXP_MAX_RX_IDLE) {
1785		sc->rx_idle_secs = 0;
1786		fxp_mc_setup(sc);
1787	}
1788	/*
1789	 * If there is no pending command, start another stats
1790	 * dump. Otherwise punt for now.
1791	 */
1792	if (CSR_READ_1(sc, FXP_CSR_SCB_COMMAND) == 0) {
1793		/*
1794		 * Start another stats dump.
1795		 */
1796		bus_dmamap_sync(sc->fxp_stag, sc->fxp_smap,
1797		    BUS_DMASYNC_PREREAD);
1798		fxp_scb_cmd(sc, FXP_SCB_COMMAND_CU_DUMPRESET);
1799	} else {
1800		/*
1801		 * A previous command is still waiting to be accepted.
1802		 * Just zero our copy of the stats and wait for the
1803		 * next timer event to update them.
1804		 */
1805		sp->tx_good = 0;
1806		sp->tx_underruns = 0;
1807		sp->tx_total_collisions = 0;
1808
1809		sp->rx_good = 0;
1810		sp->rx_crc_errors = 0;
1811		sp->rx_alignment_errors = 0;
1812		sp->rx_rnr_errors = 0;
1813		sp->rx_overrun_errors = 0;
1814	}
1815	if (sc->miibus != NULL)
1816		mii_tick(device_get_softc(sc->miibus));
1817
1818	/*
1819	 * Check that chip hasn't hung.
1820	 */
1821	fxp_watchdog(sc);
1822
1823	/*
1824	 * Schedule another timeout one second from now.
1825	 */
1826	callout_reset(&sc->stat_ch, hz, fxp_tick, sc);
1827}
1828
1829/*
1830 * Stop the interface. Cancels the statistics updater and resets
1831 * the interface.
1832 */
1833static void
1834fxp_stop(struct fxp_softc *sc)
1835{
1836	struct ifnet *ifp = sc->ifp;
1837	struct fxp_tx *txp;
1838	int i;
1839
1840	ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
1841	sc->watchdog_timer = 0;
1842
1843	/*
1844	 * Cancel stats updater.
1845	 */
1846	callout_stop(&sc->stat_ch);
1847
1848	/*
1849	 * Issue software reset, which also unloads the microcode.
1850	 */
1851	sc->flags &= ~FXP_FLAG_UCODE;
1852	CSR_WRITE_4(sc, FXP_CSR_PORT, FXP_PORT_SOFTWARE_RESET);
1853	DELAY(50);
1854
1855	/*
1856	 * Release any xmit buffers.
1857	 */
1858	txp = sc->fxp_desc.tx_list;
1859	if (txp != NULL) {
1860		for (i = 0; i < FXP_NTXCB; i++) {
1861 			if (txp[i].tx_mbuf != NULL) {
1862				bus_dmamap_sync(sc->fxp_mtag, txp[i].tx_map,
1863				    BUS_DMASYNC_POSTWRITE);
1864				bus_dmamap_unload(sc->fxp_mtag, txp[i].tx_map);
1865				m_freem(txp[i].tx_mbuf);
1866				txp[i].tx_mbuf = NULL;
1867				/* clear this to reset csum offload bits */
1868				txp[i].tx_cb->tbd[0].tb_addr = 0;
1869			}
1870		}
1871	}
1872	bus_dmamap_sync(sc->cbl_tag, sc->cbl_map, BUS_DMASYNC_PREWRITE);
1873	sc->tx_queued = 0;
1874}
1875
1876/*
1877 * Watchdog/transmission transmit timeout handler. Called when a
1878 * transmission is started on the interface, but no interrupt is
1879 * received before the timeout. This usually indicates that the
1880 * card has wedged for some reason.
1881 */
1882static void
1883fxp_watchdog(struct fxp_softc *sc)
1884{
1885
1886	FXP_LOCK_ASSERT(sc, MA_OWNED);
1887
1888	if (sc->watchdog_timer == 0 || --sc->watchdog_timer)
1889		return;
1890
1891	device_printf(sc->dev, "device timeout\n");
1892	sc->ifp->if_oerrors++;
1893
1894	fxp_init_body(sc);
1895}
1896
1897/*
1898 * Acquire locks and then call the real initialization function.  This
1899 * is necessary because ether_ioctl() calls if_init() and this would
1900 * result in mutex recursion if the mutex was held.
1901 */
1902static void
1903fxp_init(void *xsc)
1904{
1905	struct fxp_softc *sc = xsc;
1906
1907	FXP_LOCK(sc);
1908	fxp_init_body(sc);
1909	FXP_UNLOCK(sc);
1910}
1911
1912/*
1913 * Perform device initialization. This routine must be called with the
1914 * softc lock held.
1915 */
1916static void
1917fxp_init_body(struct fxp_softc *sc)
1918{
1919	struct ifnet *ifp = sc->ifp;
1920	struct fxp_cb_config *cbp;
1921	struct fxp_cb_ias *cb_ias;
1922	struct fxp_cb_tx *tcbp;
1923	struct fxp_tx *txp;
1924	struct fxp_cb_mcs *mcsp;
1925	int i, prm;
1926
1927	FXP_LOCK_ASSERT(sc, MA_OWNED);
1928	/*
1929	 * Cancel any pending I/O
1930	 */
1931	fxp_stop(sc);
1932
1933	prm = (ifp->if_flags & IFF_PROMISC) ? 1 : 0;
1934
1935	/*
1936	 * Initialize base of CBL and RFA memory. Loading with zero
1937	 * sets it up for regular linear addressing.
1938	 */
1939	CSR_WRITE_4(sc, FXP_CSR_SCB_GENERAL, 0);
1940	fxp_scb_cmd(sc, FXP_SCB_COMMAND_CU_BASE);
1941
1942	fxp_scb_wait(sc);
1943	fxp_scb_cmd(sc, FXP_SCB_COMMAND_RU_BASE);
1944
1945	/*
1946	 * Initialize base of dump-stats buffer.
1947	 */
1948	fxp_scb_wait(sc);
1949	bus_dmamap_sync(sc->fxp_stag, sc->fxp_smap, BUS_DMASYNC_PREREAD);
1950	CSR_WRITE_4(sc, FXP_CSR_SCB_GENERAL, sc->stats_addr);
1951	fxp_scb_cmd(sc, FXP_SCB_COMMAND_CU_DUMP_ADR);
1952
1953	/*
1954	 * Attempt to load microcode if requested.
1955	 */
1956	if (ifp->if_flags & IFF_LINK0 && (sc->flags & FXP_FLAG_UCODE) == 0)
1957		fxp_load_ucode(sc);
1958
1959	/*
1960	 * Initialize the multicast address list.
1961	 */
1962	if (fxp_mc_addrs(sc)) {
1963		mcsp = sc->mcsp;
1964		mcsp->cb_status = 0;
1965		mcsp->cb_command =
1966		    htole16(FXP_CB_COMMAND_MCAS | FXP_CB_COMMAND_EL);
1967		mcsp->link_addr = 0xffffffff;
1968		/*
1969	 	 * Start the multicast setup command.
1970		 */
1971		fxp_scb_wait(sc);
1972		bus_dmamap_sync(sc->mcs_tag, sc->mcs_map, BUS_DMASYNC_PREWRITE);
1973		CSR_WRITE_4(sc, FXP_CSR_SCB_GENERAL, sc->mcs_addr);
1974		fxp_scb_cmd(sc, FXP_SCB_COMMAND_CU_START);
1975		/* ...and wait for it to complete. */
1976		fxp_dma_wait(sc, &mcsp->cb_status, sc->mcs_tag, sc->mcs_map);
1977		bus_dmamap_sync(sc->mcs_tag, sc->mcs_map,
1978		    BUS_DMASYNC_POSTWRITE);
1979	}
1980
1981	/*
1982	 * We temporarily use memory that contains the TxCB list to
1983	 * construct the config CB. The TxCB list memory is rebuilt
1984	 * later.
1985	 */
1986	cbp = (struct fxp_cb_config *)sc->fxp_desc.cbl_list;
1987
1988	/*
1989	 * This bcopy is kind of disgusting, but there are a bunch of must be
1990	 * zero and must be one bits in this structure and this is the easiest
1991	 * way to initialize them all to proper values.
1992	 */
1993	bcopy(fxp_cb_config_template, cbp, sizeof(fxp_cb_config_template));
1994
1995	cbp->cb_status =	0;
1996	cbp->cb_command =	htole16(FXP_CB_COMMAND_CONFIG |
1997	    FXP_CB_COMMAND_EL);
1998	cbp->link_addr =	0xffffffff;	/* (no) next command */
1999	cbp->byte_count =	sc->flags & FXP_FLAG_EXT_RFA ? 32 : 22;
2000	cbp->rx_fifo_limit =	8;	/* rx fifo threshold (32 bytes) */
2001	cbp->tx_fifo_limit =	0;	/* tx fifo threshold (0 bytes) */
2002	cbp->adaptive_ifs =	0;	/* (no) adaptive interframe spacing */
2003	cbp->mwi_enable =	sc->flags & FXP_FLAG_MWI_ENABLE ? 1 : 0;
2004	cbp->type_enable =	0;	/* actually reserved */
2005	cbp->read_align_en =	sc->flags & FXP_FLAG_READ_ALIGN ? 1 : 0;
2006	cbp->end_wr_on_cl =	sc->flags & FXP_FLAG_WRITE_ALIGN ? 1 : 0;
2007	cbp->rx_dma_bytecount =	0;	/* (no) rx DMA max */
2008	cbp->tx_dma_bytecount =	0;	/* (no) tx DMA max */
2009	cbp->dma_mbce =		0;	/* (disable) dma max counters */
2010	cbp->late_scb =		0;	/* (don't) defer SCB update */
2011	cbp->direct_dma_dis =	1;	/* disable direct rcv dma mode */
2012	cbp->tno_int_or_tco_en =0;	/* (disable) tx not okay interrupt */
2013	cbp->ci_int =		1;	/* interrupt on CU idle */
2014	cbp->ext_txcb_dis = 	sc->flags & FXP_FLAG_EXT_TXCB ? 0 : 1;
2015	cbp->ext_stats_dis = 	1;	/* disable extended counters */
2016	cbp->keep_overrun_rx = 	0;	/* don't pass overrun frames to host */
2017	cbp->save_bf =		sc->flags & FXP_FLAG_SAVE_BAD ? 1 : prm;
2018	cbp->disc_short_rx =	!prm;	/* discard short packets */
2019	cbp->underrun_retry =	1;	/* retry mode (once) on DMA underrun */
2020	cbp->two_frames =	0;	/* do not limit FIFO to 2 frames */
2021	cbp->dyn_tbd =		0;	/* (no) dynamic TBD mode */
2022	cbp->ext_rfa =		sc->flags & FXP_FLAG_EXT_RFA ? 1 : 0;
2023	cbp->mediatype =	sc->flags & FXP_FLAG_SERIAL_MEDIA ? 0 : 1;
2024	cbp->csma_dis =		0;	/* (don't) disable link */
2025	cbp->tcp_udp_cksum =	0;	/* (don't) enable checksum */
2026	cbp->vlan_tco =		0;	/* (don't) enable vlan wakeup */
2027	cbp->link_wake_en =	0;	/* (don't) assert PME# on link change */
2028	cbp->arp_wake_en =	0;	/* (don't) assert PME# on arp */
2029	cbp->mc_wake_en =	0;	/* (don't) enable PME# on mcmatch */
2030	cbp->nsai =		1;	/* (don't) disable source addr insert */
2031	cbp->preamble_length =	2;	/* (7 byte) preamble */
2032	cbp->loopback =		0;	/* (don't) loopback */
2033	cbp->linear_priority =	0;	/* (normal CSMA/CD operation) */
2034	cbp->linear_pri_mode =	0;	/* (wait after xmit only) */
2035	cbp->interfrm_spacing =	6;	/* (96 bits of) interframe spacing */
2036	cbp->promiscuous =	prm;	/* promiscuous mode */
2037	cbp->bcast_disable =	0;	/* (don't) disable broadcasts */
2038	cbp->wait_after_win =	0;	/* (don't) enable modified backoff alg*/
2039	cbp->ignore_ul =	0;	/* consider U/L bit in IA matching */
2040	cbp->crc16_en =		0;	/* (don't) enable crc-16 algorithm */
2041	cbp->crscdt =		sc->flags & FXP_FLAG_SERIAL_MEDIA ? 1 : 0;
2042
2043	cbp->stripping =	!prm;	/* truncate rx packet to byte count */
2044	cbp->padding =		1;	/* (do) pad short tx packets */
2045	cbp->rcv_crc_xfer =	0;	/* (don't) xfer CRC to host */
2046	cbp->long_rx_en =	sc->flags & FXP_FLAG_LONG_PKT_EN ? 1 : 0;
2047	cbp->ia_wake_en =	0;	/* (don't) wake up on address match */
2048	cbp->magic_pkt_dis =	0;	/* (don't) disable magic packet */
2049					/* must set wake_en in PMCSR also */
2050	cbp->force_fdx =	0;	/* (don't) force full duplex */
2051	cbp->fdx_pin_en =	1;	/* (enable) FDX# pin */
2052	cbp->multi_ia =		0;	/* (don't) accept multiple IAs */
2053	cbp->mc_all =		sc->flags & FXP_FLAG_ALL_MCAST ? 1 : 0;
2054	cbp->gamla_rx =		sc->flags & FXP_FLAG_EXT_RFA ? 1 : 0;
2055
2056	if (sc->tunable_noflow || sc->revision == FXP_REV_82557) {
2057		/*
2058		 * The 82557 has no hardware flow control, the values
2059		 * below are the defaults for the chip.
2060		 */
2061		cbp->fc_delay_lsb =	0;
2062		cbp->fc_delay_msb =	0x40;
2063		cbp->pri_fc_thresh =	3;
2064		cbp->tx_fc_dis =	0;
2065		cbp->rx_fc_restop =	0;
2066		cbp->rx_fc_restart =	0;
2067		cbp->fc_filter =	0;
2068		cbp->pri_fc_loc =	1;
2069	} else {
2070		cbp->fc_delay_lsb =	0x1f;
2071		cbp->fc_delay_msb =	0x01;
2072		cbp->pri_fc_thresh =	3;
2073		cbp->tx_fc_dis =	0;	/* enable transmit FC */
2074		cbp->rx_fc_restop =	1;	/* enable FC restop frames */
2075		cbp->rx_fc_restart =	1;	/* enable FC restart frames */
2076		cbp->fc_filter =	!prm;	/* drop FC frames to host */
2077		cbp->pri_fc_loc =	1;	/* FC pri location (byte31) */
2078	}
2079
2080	/*
2081	 * Start the config command/DMA.
2082	 */
2083	fxp_scb_wait(sc);
2084	bus_dmamap_sync(sc->cbl_tag, sc->cbl_map, BUS_DMASYNC_PREWRITE);
2085	CSR_WRITE_4(sc, FXP_CSR_SCB_GENERAL, sc->fxp_desc.cbl_addr);
2086	fxp_scb_cmd(sc, FXP_SCB_COMMAND_CU_START);
2087	/* ...and wait for it to complete. */
2088	fxp_dma_wait(sc, &cbp->cb_status, sc->cbl_tag, sc->cbl_map);
2089	bus_dmamap_sync(sc->cbl_tag, sc->cbl_map, BUS_DMASYNC_POSTWRITE);
2090
2091	/*
2092	 * Now initialize the station address. Temporarily use the TxCB
2093	 * memory area like we did above for the config CB.
2094	 */
2095	cb_ias = (struct fxp_cb_ias *)sc->fxp_desc.cbl_list;
2096	cb_ias->cb_status = 0;
2097	cb_ias->cb_command = htole16(FXP_CB_COMMAND_IAS | FXP_CB_COMMAND_EL);
2098	cb_ias->link_addr = 0xffffffff;
2099	bcopy(IF_LLADDR(sc->ifp), cb_ias->macaddr, ETHER_ADDR_LEN);
2100
2101	/*
2102	 * Start the IAS (Individual Address Setup) command/DMA.
2103	 */
2104	fxp_scb_wait(sc);
2105	bus_dmamap_sync(sc->cbl_tag, sc->cbl_map, BUS_DMASYNC_PREWRITE);
2106	fxp_scb_cmd(sc, FXP_SCB_COMMAND_CU_START);
2107	/* ...and wait for it to complete. */
2108	fxp_dma_wait(sc, &cb_ias->cb_status, sc->cbl_tag, sc->cbl_map);
2109	bus_dmamap_sync(sc->cbl_tag, sc->cbl_map, BUS_DMASYNC_POSTWRITE);
2110
2111	/*
2112	 * Initialize transmit control block (TxCB) list.
2113	 */
2114	txp = sc->fxp_desc.tx_list;
2115	tcbp = sc->fxp_desc.cbl_list;
2116	bzero(tcbp, FXP_TXCB_SZ);
2117	for (i = 0; i < FXP_NTXCB; i++) {
2118		txp[i].tx_mbuf = NULL;
2119		tcbp[i].cb_status = htole16(FXP_CB_STATUS_C | FXP_CB_STATUS_OK);
2120		tcbp[i].cb_command = htole16(FXP_CB_COMMAND_NOP);
2121		tcbp[i].link_addr = htole32(sc->fxp_desc.cbl_addr +
2122		    (((i + 1) & FXP_TXCB_MASK) * sizeof(struct fxp_cb_tx)));
2123		if (sc->flags & FXP_FLAG_EXT_TXCB)
2124			tcbp[i].tbd_array_addr =
2125			    htole32(FXP_TXCB_DMA_ADDR(sc, &tcbp[i].tbd[2]));
2126		else
2127			tcbp[i].tbd_array_addr =
2128			    htole32(FXP_TXCB_DMA_ADDR(sc, &tcbp[i].tbd[0]));
2129		txp[i].tx_next = &txp[(i + 1) & FXP_TXCB_MASK];
2130	}
2131	/*
2132	 * Set the suspend flag on the first TxCB and start the control
2133	 * unit. It will execute the NOP and then suspend.
2134	 */
2135	tcbp->cb_command = htole16(FXP_CB_COMMAND_NOP | FXP_CB_COMMAND_S);
2136	bus_dmamap_sync(sc->cbl_tag, sc->cbl_map, BUS_DMASYNC_PREWRITE);
2137	sc->fxp_desc.tx_first = sc->fxp_desc.tx_last = txp;
2138	sc->tx_queued = 1;
2139
2140	fxp_scb_wait(sc);
2141	fxp_scb_cmd(sc, FXP_SCB_COMMAND_CU_START);
2142
2143	/*
2144	 * Initialize receiver buffer area - RFA.
2145	 */
2146	fxp_scb_wait(sc);
2147	CSR_WRITE_4(sc, FXP_CSR_SCB_GENERAL, sc->fxp_desc.rx_head->rx_addr);
2148	fxp_scb_cmd(sc, FXP_SCB_COMMAND_RU_START);
2149
2150	/*
2151	 * Set current media.
2152	 */
2153	if (sc->miibus != NULL)
2154		mii_mediachg(device_get_softc(sc->miibus));
2155
2156	ifp->if_drv_flags |= IFF_DRV_RUNNING;
2157	ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
2158
2159	/*
2160	 * Enable interrupts.
2161	 */
2162#ifdef DEVICE_POLLING
2163	/*
2164	 * ... but only do that if we are not polling. And because (presumably)
2165	 * the default is interrupts on, we need to disable them explicitly!
2166	 */
2167	if (ifp->if_capenable & IFCAP_POLLING )
2168		CSR_WRITE_1(sc, FXP_CSR_SCB_INTRCNTL, FXP_SCB_INTR_DISABLE);
2169	else
2170#endif /* DEVICE_POLLING */
2171	CSR_WRITE_1(sc, FXP_CSR_SCB_INTRCNTL, 0);
2172
2173	/*
2174	 * Start stats updater.
2175	 */
2176	callout_reset(&sc->stat_ch, hz, fxp_tick, sc);
2177}
2178
2179static int
2180fxp_serial_ifmedia_upd(struct ifnet *ifp)
2181{
2182
2183	return (0);
2184}
2185
2186static void
2187fxp_serial_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
2188{
2189
2190	ifmr->ifm_active = IFM_ETHER|IFM_MANUAL;
2191}
2192
2193/*
2194 * Change media according to request.
2195 */
2196static int
2197fxp_ifmedia_upd(struct ifnet *ifp)
2198{
2199	struct fxp_softc *sc = ifp->if_softc;
2200	struct mii_data *mii;
2201
2202	mii = device_get_softc(sc->miibus);
2203	FXP_LOCK(sc);
2204	if (mii->mii_instance) {
2205		struct mii_softc	*miisc;
2206		LIST_FOREACH(miisc, &mii->mii_phys, mii_list)
2207			mii_phy_reset(miisc);
2208	}
2209	mii_mediachg(mii);
2210	FXP_UNLOCK(sc);
2211	return (0);
2212}
2213
2214/*
2215 * Notify the world which media we're using.
2216 */
2217static void
2218fxp_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
2219{
2220	struct fxp_softc *sc = ifp->if_softc;
2221	struct mii_data *mii;
2222
2223	mii = device_get_softc(sc->miibus);
2224	FXP_LOCK(sc);
2225	mii_pollstat(mii);
2226	ifmr->ifm_active = mii->mii_media_active;
2227	ifmr->ifm_status = mii->mii_media_status;
2228
2229	if (IFM_SUBTYPE(ifmr->ifm_active) == IFM_10_T &&
2230	    sc->flags & FXP_FLAG_CU_RESUME_BUG)
2231		sc->cu_resume_bug = 1;
2232	else
2233		sc->cu_resume_bug = 0;
2234	FXP_UNLOCK(sc);
2235}
2236
2237/*
2238 * Add a buffer to the end of the RFA buffer list.
2239 * Return 0 if successful, 1 for failure. A failure results in
2240 * adding the 'oldm' (if non-NULL) on to the end of the list -
2241 * tossing out its old contents and recycling it.
2242 * The RFA struct is stuck at the beginning of mbuf cluster and the
2243 * data pointer is fixed up to point just past it.
2244 */
2245static int
2246fxp_add_rfabuf(struct fxp_softc *sc, struct fxp_rx *rxp, struct mbuf *oldm)
2247{
2248	struct mbuf *m;
2249	struct fxp_rfa *rfa, *p_rfa;
2250	struct fxp_rx *p_rx;
2251	bus_dmamap_t tmp_map;
2252	int error, reused_mbuf=0;
2253
2254	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
2255	if (m == NULL) {
2256		if (oldm == NULL)
2257			return ENOBUFS;
2258		m = oldm;
2259		m->m_data = m->m_ext.ext_buf;
2260		/*
2261		 * return error so the receive loop will
2262		 * not pass the packet to upper layer
2263		 */
2264		reused_mbuf = EAGAIN;
2265	}
2266
2267	/*
2268	 * Move the data pointer up so that the incoming data packet
2269	 * will be 32-bit aligned.
2270	 */
2271	m->m_data += RFA_ALIGNMENT_FUDGE;
2272
2273	/*
2274	 * Get a pointer to the base of the mbuf cluster and move
2275	 * data start past it.
2276	 */
2277	rfa = mtod(m, struct fxp_rfa *);
2278	m->m_data += sc->rfa_size;
2279	rfa->size = htole16(MCLBYTES - sc->rfa_size - RFA_ALIGNMENT_FUDGE);
2280
2281	rfa->rfa_status = 0;
2282	rfa->rfa_control = htole16(FXP_RFA_CONTROL_EL);
2283	rfa->actual_size = 0;
2284
2285	/*
2286	 * Initialize the rest of the RFA.  Note that since the RFA
2287	 * is misaligned, we cannot store values directly.  We're thus
2288	 * using the le32enc() function which handles endianness and
2289	 * is also alignment-safe.
2290	 */
2291	le32enc(&rfa->link_addr, 0xffffffff);
2292	le32enc(&rfa->rbd_addr, 0xffffffff);
2293
2294	/* Map the RFA into DMA memory. */
2295	error = bus_dmamap_load(sc->fxp_mtag, sc->spare_map, rfa,
2296	    MCLBYTES - RFA_ALIGNMENT_FUDGE, fxp_dma_map_addr,
2297	    &rxp->rx_addr, 0);
2298	if (error) {
2299		m_freem(m);
2300		return (error);
2301	}
2302
2303	bus_dmamap_unload(sc->fxp_mtag, rxp->rx_map);
2304	tmp_map = sc->spare_map;
2305	sc->spare_map = rxp->rx_map;
2306	rxp->rx_map = tmp_map;
2307	rxp->rx_mbuf = m;
2308
2309	bus_dmamap_sync(sc->fxp_mtag, rxp->rx_map,
2310	    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
2311
2312	/*
2313	 * If there are other buffers already on the list, attach this
2314	 * one to the end by fixing up the tail to point to this one.
2315	 */
2316	if (sc->fxp_desc.rx_head != NULL) {
2317		p_rx = sc->fxp_desc.rx_tail;
2318		p_rfa = (struct fxp_rfa *)
2319		    (p_rx->rx_mbuf->m_ext.ext_buf + RFA_ALIGNMENT_FUDGE);
2320		p_rx->rx_next = rxp;
2321		le32enc(&p_rfa->link_addr, rxp->rx_addr);
2322		p_rfa->rfa_control = 0;
2323		bus_dmamap_sync(sc->fxp_mtag, p_rx->rx_map,
2324		    BUS_DMASYNC_PREWRITE);
2325	} else {
2326		rxp->rx_next = NULL;
2327		sc->fxp_desc.rx_head = rxp;
2328	}
2329	sc->fxp_desc.rx_tail = rxp;
2330	return (reused_mbuf);
2331}
2332
2333static int
2334fxp_miibus_readreg(device_t dev, int phy, int reg)
2335{
2336	struct fxp_softc *sc = device_get_softc(dev);
2337	int count = 10000;
2338	int value;
2339
2340	CSR_WRITE_4(sc, FXP_CSR_MDICONTROL,
2341	    (FXP_MDI_READ << 26) | (reg << 16) | (phy << 21));
2342
2343	while (((value = CSR_READ_4(sc, FXP_CSR_MDICONTROL)) & 0x10000000) == 0
2344	    && count--)
2345		DELAY(10);
2346
2347	if (count <= 0)
2348		device_printf(dev, "fxp_miibus_readreg: timed out\n");
2349
2350	return (value & 0xffff);
2351}
2352
2353static void
2354fxp_miibus_writereg(device_t dev, int phy, int reg, int value)
2355{
2356	struct fxp_softc *sc = device_get_softc(dev);
2357	int count = 10000;
2358
2359	CSR_WRITE_4(sc, FXP_CSR_MDICONTROL,
2360	    (FXP_MDI_WRITE << 26) | (reg << 16) | (phy << 21) |
2361	    (value & 0xffff));
2362
2363	while ((CSR_READ_4(sc, FXP_CSR_MDICONTROL) & 0x10000000) == 0 &&
2364	    count--)
2365		DELAY(10);
2366
2367	if (count <= 0)
2368		device_printf(dev, "fxp_miibus_writereg: timed out\n");
2369}
2370
2371static int
2372fxp_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
2373{
2374	struct fxp_softc *sc = ifp->if_softc;
2375	struct ifreq *ifr = (struct ifreq *)data;
2376	struct mii_data *mii;
2377	int flag, mask, error = 0, reinit;
2378
2379	switch (command) {
2380	case SIOCSIFFLAGS:
2381		FXP_LOCK(sc);
2382		if (ifp->if_flags & IFF_ALLMULTI)
2383			sc->flags |= FXP_FLAG_ALL_MCAST;
2384		else
2385			sc->flags &= ~FXP_FLAG_ALL_MCAST;
2386
2387		/*
2388		 * If interface is marked up and not running, then start it.
2389		 * If it is marked down and running, stop it.
2390		 * XXX If it's up then re-initialize it. This is so flags
2391		 * such as IFF_PROMISC are handled.
2392		 */
2393		if (ifp->if_flags & IFF_UP) {
2394			fxp_init_body(sc);
2395		} else {
2396			if (ifp->if_drv_flags & IFF_DRV_RUNNING)
2397				fxp_stop(sc);
2398		}
2399		FXP_UNLOCK(sc);
2400		break;
2401
2402	case SIOCADDMULTI:
2403	case SIOCDELMULTI:
2404		FXP_LOCK(sc);
2405		if (ifp->if_flags & IFF_ALLMULTI)
2406			sc->flags |= FXP_FLAG_ALL_MCAST;
2407		else
2408			sc->flags &= ~FXP_FLAG_ALL_MCAST;
2409		/*
2410		 * Multicast list has changed; set the hardware filter
2411		 * accordingly.
2412		 */
2413		if ((sc->flags & FXP_FLAG_ALL_MCAST) == 0)
2414			fxp_mc_setup(sc);
2415		/*
2416		 * fxp_mc_setup() can set FXP_FLAG_ALL_MCAST, so check it
2417		 * again rather than else {}.
2418		 */
2419		if (sc->flags & FXP_FLAG_ALL_MCAST)
2420			fxp_init_body(sc);
2421		FXP_UNLOCK(sc);
2422		error = 0;
2423		break;
2424
2425	case SIOCSIFMEDIA:
2426	case SIOCGIFMEDIA:
2427		if (sc->miibus != NULL) {
2428			mii = device_get_softc(sc->miibus);
2429                        error = ifmedia_ioctl(ifp, ifr,
2430                            &mii->mii_media, command);
2431		} else {
2432                        error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, command);
2433		}
2434		break;
2435
2436	case SIOCSIFCAP:
2437		reinit = 0;
2438		mask = ifp->if_capenable ^ ifr->ifr_reqcap;
2439#ifdef DEVICE_POLLING
2440		if (mask & IFCAP_POLLING) {
2441			if (ifr->ifr_reqcap & IFCAP_POLLING) {
2442				error = ether_poll_register(fxp_poll, ifp);
2443				if (error)
2444					return(error);
2445				FXP_LOCK(sc);
2446				CSR_WRITE_1(sc, FXP_CSR_SCB_INTRCNTL,
2447				    FXP_SCB_INTR_DISABLE);
2448				ifp->if_capenable |= IFCAP_POLLING;
2449				FXP_UNLOCK(sc);
2450			} else {
2451				error = ether_poll_deregister(ifp);
2452				/* Enable interrupts in any case */
2453				FXP_LOCK(sc);
2454				CSR_WRITE_1(sc, FXP_CSR_SCB_INTRCNTL, 0);
2455				ifp->if_capenable &= ~IFCAP_POLLING;
2456				FXP_UNLOCK(sc);
2457			}
2458		}
2459#endif
2460		FXP_LOCK(sc);
2461		if ((mask & IFCAP_TXCSUM) != 0 &&
2462		    (ifp->if_capabilities & IFCAP_TXCSUM) != 0) {
2463			ifp->if_capenable ^= IFCAP_TXCSUM;
2464			if ((ifp->if_capenable & IFCAP_TXCSUM) != 0)
2465				ifp->if_hwassist |= FXP_CSUM_FEATURES;
2466			else
2467				ifp->if_hwassist &= ~FXP_CSUM_FEATURES;
2468		}
2469		if ((mask & IFCAP_RXCSUM) != 0 &&
2470		    (ifp->if_capabilities & IFCAP_RXCSUM) != 0)
2471			ifp->if_capenable ^= IFCAP_RXCSUM;
2472		if ((mask & IFCAP_VLAN_MTU) != 0 &&
2473		    (ifp->if_capabilities & IFCAP_VLAN_MTU) != 0) {
2474			ifp->if_capenable ^= IFCAP_VLAN_MTU;
2475			if (sc->revision != FXP_REV_82557)
2476				flag = FXP_FLAG_LONG_PKT_EN;
2477			else /* a hack to get long frames on the old chip */
2478				flag = FXP_FLAG_SAVE_BAD;
2479			sc->flags ^= flag;
2480			if (ifp->if_flags & IFF_UP)
2481				reinit++;
2482		}
2483		if (reinit > 0)
2484			fxp_init_body(sc);
2485		FXP_UNLOCK(sc);
2486		break;
2487
2488	default:
2489		error = ether_ioctl(ifp, command, data);
2490	}
2491	return (error);
2492}
2493
2494/*
2495 * Fill in the multicast address list and return number of entries.
2496 */
2497static int
2498fxp_mc_addrs(struct fxp_softc *sc)
2499{
2500	struct fxp_cb_mcs *mcsp = sc->mcsp;
2501	struct ifnet *ifp = sc->ifp;
2502	struct ifmultiaddr *ifma;
2503	int nmcasts;
2504
2505	nmcasts = 0;
2506	if ((sc->flags & FXP_FLAG_ALL_MCAST) == 0) {
2507		IF_ADDR_LOCK(ifp);
2508		TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2509			if (ifma->ifma_addr->sa_family != AF_LINK)
2510				continue;
2511			if (nmcasts >= MAXMCADDR) {
2512				sc->flags |= FXP_FLAG_ALL_MCAST;
2513				nmcasts = 0;
2514				break;
2515			}
2516			bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
2517			    &sc->mcsp->mc_addr[nmcasts][0], ETHER_ADDR_LEN);
2518			nmcasts++;
2519		}
2520		IF_ADDR_UNLOCK(ifp);
2521	}
2522	mcsp->mc_cnt = htole16(nmcasts * ETHER_ADDR_LEN);
2523	return (nmcasts);
2524}
2525
2526/*
2527 * Program the multicast filter.
2528 *
2529 * We have an artificial restriction that the multicast setup command
2530 * must be the first command in the chain, so we take steps to ensure
2531 * this. By requiring this, it allows us to keep up the performance of
2532 * the pre-initialized command ring (esp. link pointers) by not actually
2533 * inserting the mcsetup command in the ring - i.e. its link pointer
2534 * points to the TxCB ring, but the mcsetup descriptor itself is not part
2535 * of it. We then can do 'CU_START' on the mcsetup descriptor and have it
2536 * lead into the regular TxCB ring when it completes.
2537 *
2538 * This function must be called at splimp.
2539 */
2540static void
2541fxp_mc_setup(struct fxp_softc *sc)
2542{
2543	struct fxp_cb_mcs *mcsp = sc->mcsp;
2544	struct fxp_tx *txp;
2545	int count;
2546
2547	FXP_LOCK_ASSERT(sc, MA_OWNED);
2548	/*
2549	 * If there are queued commands, we must wait until they are all
2550	 * completed. If we are already waiting, then add a NOP command
2551	 * with interrupt option so that we're notified when all commands
2552	 * have been completed - fxp_start() ensures that no additional
2553	 * TX commands will be added when need_mcsetup is true.
2554	 */
2555	if (sc->tx_queued) {
2556		/*
2557		 * need_mcsetup will be true if we are already waiting for the
2558		 * NOP command to be completed (see below). In this case, bail.
2559		 */
2560		if (sc->need_mcsetup)
2561			return;
2562		sc->need_mcsetup = 1;
2563
2564		/*
2565		 * Add a NOP command with interrupt so that we are notified
2566		 * when all TX commands have been processed.
2567		 */
2568		txp = sc->fxp_desc.tx_last->tx_next;
2569		txp->tx_mbuf = NULL;
2570		txp->tx_cb->cb_status = 0;
2571		txp->tx_cb->cb_command = htole16(FXP_CB_COMMAND_NOP |
2572		    FXP_CB_COMMAND_S | FXP_CB_COMMAND_I);
2573		/*
2574		 * Advance the end of list forward.
2575		 */
2576		sc->fxp_desc.tx_last->tx_cb->cb_command &=
2577		    htole16(~FXP_CB_COMMAND_S);
2578		bus_dmamap_sync(sc->cbl_tag, sc->cbl_map, BUS_DMASYNC_PREWRITE);
2579		sc->fxp_desc.tx_last = txp;
2580		sc->tx_queued++;
2581		/*
2582		 * Issue a resume in case the CU has just suspended.
2583		 */
2584		fxp_scb_wait(sc);
2585		fxp_scb_cmd(sc, FXP_SCB_COMMAND_CU_RESUME);
2586		/*
2587		 * Set a 5 second timer just in case we don't hear from the
2588		 * card again.
2589		 */
2590		sc->watchdog_timer = 5;
2591
2592		return;
2593	}
2594	sc->need_mcsetup = 0;
2595
2596	/*
2597	 * Initialize multicast setup descriptor.
2598	 */
2599	mcsp->cb_status = 0;
2600	mcsp->cb_command = htole16(FXP_CB_COMMAND_MCAS |
2601	    FXP_CB_COMMAND_S | FXP_CB_COMMAND_I);
2602	mcsp->link_addr = htole32(sc->fxp_desc.cbl_addr);
2603	txp = &sc->fxp_desc.mcs_tx;
2604	txp->tx_mbuf = NULL;
2605	txp->tx_cb = (struct fxp_cb_tx *)sc->mcsp;
2606	txp->tx_next = sc->fxp_desc.tx_list;
2607	(void) fxp_mc_addrs(sc);
2608	sc->fxp_desc.tx_first = sc->fxp_desc.tx_last = txp;
2609	sc->tx_queued = 1;
2610
2611	/*
2612	 * Wait until command unit is not active. This should never
2613	 * be the case when nothing is queued, but make sure anyway.
2614	 */
2615	count = 100;
2616	while ((CSR_READ_1(sc, FXP_CSR_SCB_RUSCUS) >> 6) ==
2617	    FXP_SCB_CUS_ACTIVE && --count)
2618		DELAY(10);
2619	if (count == 0) {
2620		device_printf(sc->dev, "command queue timeout\n");
2621		return;
2622	}
2623
2624	/*
2625	 * Start the multicast setup command.
2626	 */
2627	fxp_scb_wait(sc);
2628	bus_dmamap_sync(sc->mcs_tag, sc->mcs_map, BUS_DMASYNC_PREWRITE);
2629	CSR_WRITE_4(sc, FXP_CSR_SCB_GENERAL, sc->mcs_addr);
2630	fxp_scb_cmd(sc, FXP_SCB_COMMAND_CU_START);
2631
2632	sc->watchdog_timer = 2;
2633	return;
2634}
2635
2636static uint32_t fxp_ucode_d101a[] = D101_A_RCVBUNDLE_UCODE;
2637static uint32_t fxp_ucode_d101b0[] = D101_B0_RCVBUNDLE_UCODE;
2638static uint32_t fxp_ucode_d101ma[] = D101M_B_RCVBUNDLE_UCODE;
2639static uint32_t fxp_ucode_d101s[] = D101S_RCVBUNDLE_UCODE;
2640static uint32_t fxp_ucode_d102[] = D102_B_RCVBUNDLE_UCODE;
2641static uint32_t fxp_ucode_d102c[] = D102_C_RCVBUNDLE_UCODE;
2642static uint32_t fxp_ucode_d102e[] = D102_E_RCVBUNDLE_UCODE;
2643
2644#define UCODE(x)	x, sizeof(x)/sizeof(uint32_t)
2645
2646struct ucode {
2647	uint32_t	revision;
2648	uint32_t	*ucode;
2649	int		length;
2650	u_short		int_delay_offset;
2651	u_short		bundle_max_offset;
2652} ucode_table[] = {
2653	{ FXP_REV_82558_A4, UCODE(fxp_ucode_d101a), D101_CPUSAVER_DWORD, 0 },
2654	{ FXP_REV_82558_B0, UCODE(fxp_ucode_d101b0), D101_CPUSAVER_DWORD, 0 },
2655	{ FXP_REV_82559_A0, UCODE(fxp_ucode_d101ma),
2656	    D101M_CPUSAVER_DWORD, D101M_CPUSAVER_BUNDLE_MAX_DWORD },
2657	{ FXP_REV_82559S_A, UCODE(fxp_ucode_d101s),
2658	    D101S_CPUSAVER_DWORD, D101S_CPUSAVER_BUNDLE_MAX_DWORD },
2659	{ FXP_REV_82550, UCODE(fxp_ucode_d102),
2660	    D102_B_CPUSAVER_DWORD, D102_B_CPUSAVER_BUNDLE_MAX_DWORD },
2661	{ FXP_REV_82550_C, UCODE(fxp_ucode_d102c),
2662	    D102_C_CPUSAVER_DWORD, D102_C_CPUSAVER_BUNDLE_MAX_DWORD },
2663	{ FXP_REV_82551_F, UCODE(fxp_ucode_d102e),
2664	    D102_E_CPUSAVER_DWORD, D102_E_CPUSAVER_BUNDLE_MAX_DWORD },
2665	{ 0, NULL, 0, 0, 0 }
2666};
2667
2668static void
2669fxp_load_ucode(struct fxp_softc *sc)
2670{
2671	struct ucode *uc;
2672	struct fxp_cb_ucode *cbp;
2673	int i;
2674
2675	for (uc = ucode_table; uc->ucode != NULL; uc++)
2676		if (sc->revision == uc->revision)
2677			break;
2678	if (uc->ucode == NULL)
2679		return;
2680	cbp = (struct fxp_cb_ucode *)sc->fxp_desc.cbl_list;
2681	cbp->cb_status = 0;
2682	cbp->cb_command = htole16(FXP_CB_COMMAND_UCODE | FXP_CB_COMMAND_EL);
2683	cbp->link_addr = 0xffffffff;    	/* (no) next command */
2684	for (i = 0; i < uc->length; i++)
2685		cbp->ucode[i] = htole32(uc->ucode[i]);
2686	if (uc->int_delay_offset)
2687		*(uint16_t *)&cbp->ucode[uc->int_delay_offset] =
2688		    htole16(sc->tunable_int_delay + sc->tunable_int_delay / 2);
2689	if (uc->bundle_max_offset)
2690		*(uint16_t *)&cbp->ucode[uc->bundle_max_offset] =
2691		    htole16(sc->tunable_bundle_max);
2692	/*
2693	 * Download the ucode to the chip.
2694	 */
2695	fxp_scb_wait(sc);
2696	bus_dmamap_sync(sc->cbl_tag, sc->cbl_map, BUS_DMASYNC_PREWRITE);
2697	CSR_WRITE_4(sc, FXP_CSR_SCB_GENERAL, sc->fxp_desc.cbl_addr);
2698	fxp_scb_cmd(sc, FXP_SCB_COMMAND_CU_START);
2699	/* ...and wait for it to complete. */
2700	fxp_dma_wait(sc, &cbp->cb_status, sc->cbl_tag, sc->cbl_map);
2701	bus_dmamap_sync(sc->cbl_tag, sc->cbl_map, BUS_DMASYNC_POSTWRITE);
2702	device_printf(sc->dev,
2703	    "Microcode loaded, int_delay: %d usec  bundle_max: %d\n",
2704	    sc->tunable_int_delay,
2705	    uc->bundle_max_offset == 0 ? 0 : sc->tunable_bundle_max);
2706	sc->flags |= FXP_FLAG_UCODE;
2707}
2708
2709static int
2710sysctl_int_range(SYSCTL_HANDLER_ARGS, int low, int high)
2711{
2712	int error, value;
2713
2714	value = *(int *)arg1;
2715	error = sysctl_handle_int(oidp, &value, 0, req);
2716	if (error || !req->newptr)
2717		return (error);
2718	if (value < low || value > high)
2719		return (EINVAL);
2720	*(int *)arg1 = value;
2721	return (0);
2722}
2723
2724/*
2725 * Interrupt delay is expressed in microseconds, a multiplier is used
2726 * to convert this to the appropriate clock ticks before using.
2727 */
2728static int
2729sysctl_hw_fxp_int_delay(SYSCTL_HANDLER_ARGS)
2730{
2731	return (sysctl_int_range(oidp, arg1, arg2, req, 300, 3000));
2732}
2733
2734static int
2735sysctl_hw_fxp_bundle_max(SYSCTL_HANDLER_ARGS)
2736{
2737	return (sysctl_int_range(oidp, arg1, arg2, req, 1, 0xffff));
2738}
2739