sys/dev/rl/if_rl.c

   1 /*-
   2  * Copyright (c) 1997, 1998
   3  *      Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Bill Paul.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 /*
  37  * RealTek 8129/8139 PCI NIC driver
  38  *
  39  * Supports several extremely cheap PCI 10/100 adapters based on
  40  * the RealTek chipset. Datasheets can be obtained from
  41  * www.realtek.com.tw.
  42  *
  43  * Written by Bill Paul <wpaul@ctr.columbia.edu>
  44  * Electrical Engineering Department
  45  * Columbia University, New York City
  46  */
  47 /*
  48  * The RealTek 8139 PCI NIC redefines the meaning of 'low end.' This is
  49  * probably the worst PCI ethernet controller ever made, with the possible
  50  * exception of the FEAST chip made by SMC. The 8139 supports bus-master
  51  * DMA, but it has a terrible interface that nullifies any performance
  52  * gains that bus-master DMA usually offers.
  53  *
  54  * For transmission, the chip offers a series of four TX descriptor
  55  * registers. Each transmit frame must be in a contiguous buffer, aligned
  56  * on a longword (32-bit) boundary. This means we almost always have to
  57  * do mbuf copies in order to transmit a frame, except in the unlikely
  58  * case where a) the packet fits into a single mbuf, and b) the packet
  59  * is 32-bit aligned within the mbuf's data area. The presence of only
  60  * four descriptor registers means that we can never have more than four
  61  * packets queued for transmission at any one time.
  62  *
  63  * Reception is not much better. The driver has to allocate a single large
  64  * buffer area (up to 64K in size) into which the chip will DMA received
  65  * frames. Because we don't know where within this region received packets
  66  * will begin or end, we have no choice but to copy data from the buffer
  67  * area into mbufs in order to pass the packets up to the higher protocol
  68  * levels.
  69  *
  70  * It's impossible given this rotten design to really achieve decent
  71  * performance at 100Mbps, unless you happen to have a 400Mhz PII or
  72  * some equally overmuscled CPU to drive it.
  73  *
  74  * On the bright side, the 8139 does have a built-in PHY, although
  75  * rather than using an MDIO serial interface like most other NICs, the
  76  * PHY registers are directly accessible through the 8139's register
  77  * space. The 8139 supports autonegotiation, as well as a 64-bit multicast
  78  * filter.
  79  *
  80  * The 8129 chip is an older version of the 8139 that uses an external PHY
  81  * chip. The 8129 has a serial MDIO interface for accessing the MII where
  82  * the 8139 lets you directly access the on-board PHY registers. We need
  83  * to select which interface to use depending on the chip type.
  84  */
  85
  86 #ifdef HAVE_KERNEL_OPTION_HEADERS
  87 #include "opt_device_polling.h"
  88 #endif
  89
  90 #include <sys/param.h>
  91 #include <sys/endian.h>
  92 #include <sys/systm.h>
  93 #include <sys/sockio.h>
  94 #include <sys/mbuf.h>
  95 #include <sys/malloc.h>
  96 #include <sys/kernel.h>
  97 #include <sys/module.h>
  98 #include <sys/socket.h>
  99 #include <sys/sysctl.h>
 100
 101 #include <net/if.h>
 102 #include <net/if_var.h>
 103 #include <net/if_arp.h>
 104 #include <net/ethernet.h>
 105 #include <net/if_dl.h>
 106 #include <net/if_media.h>
 107 #include <net/if_types.h>
 108
 109 #include <net/bpf.h>
 110
 111 #include <machine/bus.h>
 112 #include <machine/resource.h>
 113 #include <sys/bus.h>
 114 #include <sys/rman.h>
 115
 116 #include <dev/mii/mii.h>
 117 #include <dev/mii/mii_bitbang.h>
 118 #include <dev/mii/miivar.h>
 119
 120 #include <dev/pci/pcireg.h>
 121 #include <dev/pci/pcivar.h>
 122
 123 MODULE_DEPEND(rl, pci, 1, 1, 1);
 124 MODULE_DEPEND(rl, ether, 1, 1, 1);
 125 MODULE_DEPEND(rl, miibus, 1, 1, 1);
 126
 127 /* "device miibus" required.  See GENERIC if you get errors here. */
 128 #include "miibus_if.h"
 129
 130 #include <dev/rl/if_rlreg.h>
 131
 132 /*
 133  * Various supported device vendors/types and their names.
 134  */
 135 static const struct rl_type rl_devs[] = {
 136         { RT_VENDORID, RT_DEVICEID_8129, RL_8129,
 137                 "RealTek 8129 10/100BaseTX" },
 138         { RT_VENDORID, RT_DEVICEID_8139, RL_8139,
 139                 "RealTek 8139 10/100BaseTX" },
 140         { RT_VENDORID, RT_DEVICEID_8139D, RL_8139,
 141                 "RealTek 8139 10/100BaseTX" },
 142         { RT_VENDORID, RT_DEVICEID_8138, RL_8139,
 143                 "RealTek 8139 10/100BaseTX CardBus" },
 144         { RT_VENDORID, RT_DEVICEID_8100, RL_8139,
 145                 "RealTek 8100 10/100BaseTX" },
 146         { ACCTON_VENDORID, ACCTON_DEVICEID_5030, RL_8139,
 147                 "Accton MPX 5030/5038 10/100BaseTX" },
 148         { DELTA_VENDORID, DELTA_DEVICEID_8139, RL_8139,
 149                 "Delta Electronics 8139 10/100BaseTX" },
 150         { ADDTRON_VENDORID, ADDTRON_DEVICEID_8139, RL_8139,
 151                 "Addtron Technology 8139 10/100BaseTX" },
 152         { DLINK_VENDORID, DLINK_DEVICEID_520TX_REVC1, RL_8139,
 153                 "D-Link DFE-520TX (rev. C1) 10/100BaseTX" },
 154         { DLINK_VENDORID, DLINK_DEVICEID_530TXPLUS, RL_8139,
 155                 "D-Link DFE-530TX+ 10/100BaseTX" },
 156         { DLINK_VENDORID, DLINK_DEVICEID_690TXD, RL_8139,
 157                 "D-Link DFE-690TXD 10/100BaseTX" },
 158         { NORTEL_VENDORID, ACCTON_DEVICEID_5030, RL_8139,
 159                 "Nortel Networks 10/100BaseTX" },
 160         { COREGA_VENDORID, COREGA_DEVICEID_FETHERCBTXD, RL_8139,
 161                 "Corega FEther CB-TXD" },
 162         { COREGA_VENDORID, COREGA_DEVICEID_FETHERIICBTXD, RL_8139,
 163                 "Corega FEtherII CB-TXD" },
 164         { PEPPERCON_VENDORID, PEPPERCON_DEVICEID_ROLF, RL_8139,
 165                 "Peppercon AG ROL-F" },
 166         { PLANEX_VENDORID, PLANEX_DEVICEID_FNW3603TX, RL_8139,
 167                 "Planex FNW-3603-TX" },
 168         { PLANEX_VENDORID, PLANEX_DEVICEID_FNW3800TX, RL_8139,
 169                 "Planex FNW-3800-TX" },
 170         { CP_VENDORID, RT_DEVICEID_8139, RL_8139,
 171                 "Compaq HNE-300" },
 172         { LEVEL1_VENDORID, LEVEL1_DEVICEID_FPC0106TX, RL_8139,
 173                 "LevelOne FPC-0106TX" },
 174         { EDIMAX_VENDORID, EDIMAX_DEVICEID_EP4103DL, RL_8139,
 175                 "Edimax EP-4103DL CardBus" }
 176 };
 177
 178 static int rl_attach(device_t);
 179 static int rl_detach(device_t);
 180 static void rl_dmamap_cb(void *, bus_dma_segment_t *, int, int);
 181 static int rl_dma_alloc(struct rl_softc *);
 182 static void rl_dma_free(struct rl_softc *);
 183 static void rl_eeprom_putbyte(struct rl_softc *, int);
 184 static void rl_eeprom_getword(struct rl_softc *, int, uint16_t *);
 185 static int rl_encap(struct rl_softc *, struct mbuf **);
 186 static int rl_list_tx_init(struct rl_softc *);
 187 static int rl_list_rx_init(struct rl_softc *);
 188 static int rl_ifmedia_upd(struct ifnet *);
 189 static void rl_ifmedia_sts(struct ifnet *, struct ifmediareq *);
 190 static int rl_ioctl(struct ifnet *, u_long, caddr_t);
 191 static void rl_intr(void *);
 192 static void rl_init(void *);
 193 static void rl_init_locked(struct rl_softc *sc);
 194 static int rl_miibus_readreg(device_t, int, int);
 195 static void rl_miibus_statchg(device_t);
 196 static int rl_miibus_writereg(device_t, int, int, int);
 197 #ifdef DEVICE_POLLING
 198 static int rl_poll(struct ifnet *ifp, enum poll_cmd cmd, int count);
 199 static int rl_poll_locked(struct ifnet *ifp, enum poll_cmd cmd, int count);
 200 #endif
 201 static int rl_probe(device_t);
 202 static void rl_read_eeprom(struct rl_softc *, uint8_t *, int, int, int);
 203 static void rl_reset(struct rl_softc *);
 204 static int rl_resume(device_t);
 205 static int rl_rxeof(struct rl_softc *);
 206 static void rl_rxfilter(struct rl_softc *);
 207 static int rl_shutdown(device_t);
 208 static void rl_start(struct ifnet *);
 209 static void rl_start_locked(struct ifnet *);
 210 static void rl_stop(struct rl_softc *);
 211 static int rl_suspend(device_t);
 212 static void rl_tick(void *);
 213 static void rl_txeof(struct rl_softc *);
 214 static void rl_watchdog(struct rl_softc *);
 215 static void rl_setwol(struct rl_softc *);
 216 static void rl_clrwol(struct rl_softc *);
 217
 218 /*
 219  * MII bit-bang glue
 220  */
 221 static uint32_t rl_mii_bitbang_read(device_t);
 222 static void rl_mii_bitbang_write(device_t, uint32_t);
 223
 224 static const struct mii_bitbang_ops rl_mii_bitbang_ops = {
 225         rl_mii_bitbang_read,
 226         rl_mii_bitbang_write,
 227         {
 228                 RL_MII_DATAOUT, /* MII_BIT_MDO */
 229                 RL_MII_DATAIN,  /* MII_BIT_MDI */
 230                 RL_MII_CLK,     /* MII_BIT_MDC */
 231                 RL_MII_DIR,     /* MII_BIT_DIR_HOST_PHY */
 232                 0,              /* MII_BIT_DIR_PHY_HOST */
 233         }
 234 };
 235
 236 static device_method_t rl_methods[] = {
 237         /* Device interface */
 238         DEVMETHOD(device_probe,         rl_probe),
 239         DEVMETHOD(device_attach,        rl_attach),
 240         DEVMETHOD(device_detach,        rl_detach),
 241         DEVMETHOD(device_suspend,       rl_suspend),
 242         DEVMETHOD(device_resume,        rl_resume),
 243         DEVMETHOD(device_shutdown,      rl_shutdown),
 244
 245         /* MII interface */
 246         DEVMETHOD(miibus_readreg,       rl_miibus_readreg),
 247         DEVMETHOD(miibus_writereg,      rl_miibus_writereg),
 248         DEVMETHOD(miibus_statchg,       rl_miibus_statchg),
 249
 250         DEVMETHOD_END
 251 };
 252
 253 static driver_t rl_driver = {
 254         "rl",
 255         rl_methods,
 256         sizeof(struct rl_softc)
 257 };
 258
 259 static devclass_t rl_devclass;
 260
 261 DRIVER_MODULE(rl, pci, rl_driver, rl_devclass, 0, 0);
 262 MODULE_PNP_INFO("U16:vendor;U16:device", pci, rl, rl_devs,
 263     nitems(rl_devs) - 1);
 264 DRIVER_MODULE(rl, cardbus, rl_driver, rl_devclass, 0, 0);
 265 DRIVER_MODULE(miibus, rl, miibus_driver, miibus_devclass, 0, 0);
 266
 267 #define EE_SET(x)                                       \
 268         CSR_WRITE_1(sc, RL_EECMD,                       \
 269                 CSR_READ_1(sc, RL_EECMD) | x)
 270
 271 #define EE_CLR(x)                                       \
 272         CSR_WRITE_1(sc, RL_EECMD,                       \
 273                 CSR_READ_1(sc, RL_EECMD) & ~x)
 274
 275 /*
 276  * Send a read command and address to the EEPROM, check for ACK.
 277  */
 278 static void
 279 rl_eeprom_putbyte(struct rl_softc *sc, int addr)
 280 {
 281         int                     d, i;
 282
 283         d = addr | sc->rl_eecmd_read;
 284
 285         /*
 286          * Feed in each bit and strobe the clock.
 287          */
 288         for (i = 0x400; i; i >>= 1) {
 289                 if (d & i) {
 290                         EE_SET(RL_EE_DATAIN);
 291                 } else {
 292                         EE_CLR(RL_EE_DATAIN);
 293                 }
 294                 DELAY(100);
 295                 EE_SET(RL_EE_CLK);
 296                 DELAY(150);
 297                 EE_CLR(RL_EE_CLK);
 298                 DELAY(100);
 299         }
 300 }
 301
 302 /*
 303  * Read a word of data stored in the EEPROM at address 'addr.'
 304  */
 305 static void
 306 rl_eeprom_getword(struct rl_softc *sc, int addr, uint16_t *dest)
 307 {
 308         int                     i;
 309         uint16_t                word = 0;
 310
 311         /* Enter EEPROM access mode. */
 312         CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_PROGRAM|RL_EE_SEL);
 313
 314         /*
 315          * Send address of word we want to read.
 316          */
 317         rl_eeprom_putbyte(sc, addr);
 318
 319         CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_PROGRAM|RL_EE_SEL);
 320
 321         /*
 322          * Start reading bits from EEPROM.
 323          */
 324         for (i = 0x8000; i; i >>= 1) {
 325                 EE_SET(RL_EE_CLK);
 326                 DELAY(100);
 327                 if (CSR_READ_1(sc, RL_EECMD) & RL_EE_DATAOUT)
 328                         word |= i;
 329                 EE_CLR(RL_EE_CLK);
 330                 DELAY(100);
 331         }
 332
 333         /* Turn off EEPROM access mode. */
 334         CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_OFF);
 335
 336         *dest = word;
 337 }
 338
 339 /*
 340  * Read a sequence of words from the EEPROM.
 341  */
 342 static void
 343 rl_read_eeprom(struct rl_softc *sc, uint8_t *dest, int off, int cnt, int swap)
 344 {
 345         int                     i;
 346         uint16_t                word = 0, *ptr;
 347
 348         for (i = 0; i < cnt; i++) {
 349                 rl_eeprom_getword(sc, off + i, &word);
 350                 ptr = (uint16_t *)(dest + (i * 2));
 351                 if (swap)
 352                         *ptr = ntohs(word);
 353                 else
 354                         *ptr = word;
 355         }
 356 }
 357
 358 /*
 359  * Read the MII serial port for the MII bit-bang module.
 360  */
 361 static uint32_t
 362 rl_mii_bitbang_read(device_t dev)
 363 {
 364         struct rl_softc *sc;
 365         uint32_t val;
 366
 367         sc = device_get_softc(dev);
 368
 369         val = CSR_READ_1(sc, RL_MII);
 370         CSR_BARRIER(sc, RL_MII, 1,
 371             BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
 372
 373         return (val);
 374 }
 375
 376 /*
 377  * Write the MII serial port for the MII bit-bang module.
 378  */
 379 static void
 380 rl_mii_bitbang_write(device_t dev, uint32_t val)
 381 {
 382         struct rl_softc *sc;
 383
 384         sc = device_get_softc(dev);
 385
 386         CSR_WRITE_1(sc, RL_MII, val);
 387         CSR_BARRIER(sc, RL_MII, 1,
 388             BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE);
 389 }
 390
 391 static int
 392 rl_miibus_readreg(device_t dev, int phy, int reg)
 393 {
 394         struct rl_softc         *sc;
 395         uint16_t                rl8139_reg;
 396
 397         sc = device_get_softc(dev);
 398
 399         if (sc->rl_type == RL_8139) {
 400                 switch (reg) {
 401                 case MII_BMCR:
 402                         rl8139_reg = RL_BMCR;
 403                         break;
 404                 case MII_BMSR:
 405                         rl8139_reg = RL_BMSR;
 406                         break;
 407                 case MII_ANAR:
 408                         rl8139_reg = RL_ANAR;
 409                         break;
 410                 case MII_ANER:
 411                         rl8139_reg = RL_ANER;
 412                         break;
 413                 case MII_ANLPAR:
 414                         rl8139_reg = RL_LPAR;
 415                         break;
 416                 case MII_PHYIDR1:
 417                 case MII_PHYIDR2:
 418                         return (0);
 419                 /*
 420                  * Allow the rlphy driver to read the media status
 421                  * register. If we have a link partner which does not
 422                  * support NWAY, this is the register which will tell
 423                  * us the results of parallel detection.
 424                  */
 425                 case RL_MEDIASTAT:
 426                         return (CSR_READ_1(sc, RL_MEDIASTAT));
 427                 default:
 428                         device_printf(sc->rl_dev, "bad phy register\n");
 429                         return (0);
 430                 }
 431                 return (CSR_READ_2(sc, rl8139_reg));
 432         }
 433
 434         return (mii_bitbang_readreg(dev, &rl_mii_bitbang_ops, phy, reg));
 435 }
 436
 437 static int
 438 rl_miibus_writereg(device_t dev, int phy, int reg, int data)
 439 {
 440         struct rl_softc         *sc;
 441         uint16_t                rl8139_reg;
 442
 443         sc = device_get_softc(dev);
 444
 445         if (sc->rl_type == RL_8139) {
 446                 switch (reg) {
 447                 case MII_BMCR:
 448                         rl8139_reg = RL_BMCR;
 449                         break;
 450                 case MII_BMSR:
 451                         rl8139_reg = RL_BMSR;
 452                         break;
 453                 case MII_ANAR:
 454                         rl8139_reg = RL_ANAR;
 455                         break;
 456                 case MII_ANER:
 457                         rl8139_reg = RL_ANER;
 458                         break;
 459                 case MII_ANLPAR:
 460                         rl8139_reg = RL_LPAR;
 461                         break;
 462                 case MII_PHYIDR1:
 463                 case MII_PHYIDR2:
 464                         return (0);
 465                         break;
 466                 default:
 467                         device_printf(sc->rl_dev, "bad phy register\n");
 468                         return (0);
 469                 }
 470                 CSR_WRITE_2(sc, rl8139_reg, data);
 471                 return (0);
 472         }
 473
 474         mii_bitbang_writereg(dev, &rl_mii_bitbang_ops, phy, reg, data);
 475
 476         return (0);
 477 }
 478
 479 static void
 480 rl_miibus_statchg(device_t dev)
 481 {
 482         struct rl_softc         *sc;
 483         struct ifnet            *ifp;
 484         struct mii_data         *mii;
 485
 486         sc = device_get_softc(dev);
 487         mii = device_get_softc(sc->rl_miibus);
 488         ifp = sc->rl_ifp;
 489         if (mii == NULL || ifp == NULL ||
 490             (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
 491                 return;
 492
 493         sc->rl_flags &= ~RL_FLAG_LINK;
 494         if ((mii->mii_media_status & (IFM_ACTIVE | IFM_AVALID)) ==
 495             (IFM_ACTIVE | IFM_AVALID)) {
 496                 switch (IFM_SUBTYPE(mii->mii_media_active)) {
 497                 case IFM_10_T:
 498                 case IFM_100_TX:
 499                         sc->rl_flags |= RL_FLAG_LINK;
 500                         break;
 501                 default:
 502                         break;
 503                 }
 504         }
 505         /*
 506          * RealTek controllers do not provide any interface to
 507          * Tx/Rx MACs for resolved speed, duplex and flow-control
 508          * parameters.
 509          */
 510 }
 511
 512 static u_int
 513 rl_hash_maddr(void *arg, struct sockaddr_dl *sdl, u_int cnt)
 514 {
 515         uint32_t *hashes = arg;
 516         int h;
 517
 518         h = ether_crc32_be(LLADDR(sdl), ETHER_ADDR_LEN) >> 26;
 519         if (h < 32)
 520                 hashes[0] |= (1 << h);
 521         else
 522                 hashes[1] |= (1 << (h - 32));
 523
 524         return (1);
 525 }
 526
 527 /*
 528  * Program the 64-bit multicast hash filter.
 529  */
 530 static void
 531 rl_rxfilter(struct rl_softc *sc)
 532 {
 533         struct ifnet            *ifp = sc->rl_ifp;
 534         uint32_t                hashes[2] = { 0, 0 };
 535         uint32_t                rxfilt;
 536
 537         RL_LOCK_ASSERT(sc);
 538
 539         rxfilt = CSR_READ_4(sc, RL_RXCFG);
 540         rxfilt &= ~(RL_RXCFG_RX_ALLPHYS | RL_RXCFG_RX_BROAD |
 541             RL_RXCFG_RX_MULTI);
 542         /* Always accept frames destined for this host. */
 543         rxfilt |= RL_RXCFG_RX_INDIV;
 544         /* Set capture broadcast bit to capture broadcast frames. */
 545         if (ifp->if_flags & IFF_BROADCAST)
 546                 rxfilt |= RL_RXCFG_RX_BROAD;
 547         if (ifp->if_flags & IFF_ALLMULTI || ifp->if_flags & IFF_PROMISC) {
 548                 rxfilt |= RL_RXCFG_RX_MULTI;
 549                 if (ifp->if_flags & IFF_PROMISC)
 550                         rxfilt |= RL_RXCFG_RX_ALLPHYS;
 551                 hashes[0] = 0xFFFFFFFF;
 552                 hashes[1] = 0xFFFFFFFF;
 553         } else {
 554                 /* Now program new ones. */
 555                 if_foreach_llmaddr(ifp, rl_hash_maddr, hashes);
 556                 if (hashes[0] != 0 || hashes[1] != 0)
 557                         rxfilt |= RL_RXCFG_RX_MULTI;
 558         }
 559
 560         CSR_WRITE_4(sc, RL_MAR0, hashes[0]);
 561         CSR_WRITE_4(sc, RL_MAR4, hashes[1]);
 562         CSR_WRITE_4(sc, RL_RXCFG, rxfilt);
 563 }
 564
 565 static void
 566 rl_reset(struct rl_softc *sc)
 567 {
 568         int                     i;
 569
 570         RL_LOCK_ASSERT(sc);
 571
 572         CSR_WRITE_1(sc, RL_COMMAND, RL_CMD_RESET);
 573
 574         for (i = 0; i < RL_TIMEOUT; i++) {
 575                 DELAY(10);
 576                 if (!(CSR_READ_1(sc, RL_COMMAND) & RL_CMD_RESET))
 577                         break;
 578         }
 579         if (i == RL_TIMEOUT)
 580                 device_printf(sc->rl_dev, "reset never completed!\n");
 581 }
 582
 583 /*
 584  * Probe for a RealTek 8129/8139 chip. Check the PCI vendor and device
 585  * IDs against our list and return a device name if we find a match.
 586  */
 587 static int
 588 rl_probe(device_t dev)
 589 {
 590         const struct rl_type    *t;
 591         uint16_t                devid, revid, vendor;
 592         int                     i;
 593
 594         vendor = pci_get_vendor(dev);
 595         devid = pci_get_device(dev);
 596         revid = pci_get_revid(dev);
 597
 598         if (vendor == RT_VENDORID && devid == RT_DEVICEID_8139) {
 599                 if (revid == 0x20) {
 600                         /* 8139C+, let re(4) take care of this device. */
 601                         return (ENXIO);
 602                 }
 603         }
 604         t = rl_devs;
 605         for (i = 0; i < nitems(rl_devs); i++, t++) {
 606                 if (vendor == t->rl_vid && devid == t->rl_did) {
 607                         device_set_desc(dev, t->rl_name);
 608                         return (BUS_PROBE_DEFAULT);
 609                 }
 610         }
 611
 612         return (ENXIO);
 613 }
 614
 615 struct rl_dmamap_arg {
 616         bus_addr_t      rl_busaddr;
 617 };
 618
 619 static void
 620 rl_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
 621 {
 622         struct rl_dmamap_arg    *ctx;
 623
 624         if (error != 0)
 625                 return;
 626
 627         KASSERT(nsegs == 1, ("%s: %d segments returned!", __func__, nsegs));
 628
 629         ctx = (struct rl_dmamap_arg *)arg;
 630         ctx->rl_busaddr = segs[0].ds_addr;
 631 }
 632
 633 /*
 634  * Attach the interface. Allocate softc structures, do ifmedia
 635  * setup and ethernet/BPF attach.
 636  */
 637 static int
 638 rl_attach(device_t dev)
 639 {
 640         uint8_t                 eaddr[ETHER_ADDR_LEN];
 641         uint16_t                as[3];
 642         struct ifnet            *ifp;
 643         struct rl_softc         *sc;
 644         const struct rl_type    *t;
 645         struct sysctl_ctx_list  *ctx;
 646         struct sysctl_oid_list  *children;
 647         int                     error = 0, hwrev, i, phy, pmc, rid;
 648         int                     prefer_iomap, unit;
 649         uint16_t                rl_did = 0;
 650         char                    tn[32];
 651
 652         sc = device_get_softc(dev);
 653         unit = device_get_unit(dev);
 654         sc->rl_dev = dev;
 655
 656         sc->rl_twister_enable = 0;
 657         snprintf(tn, sizeof(tn), "dev.rl.%d.twister_enable", unit);
 658         TUNABLE_INT_FETCH(tn, &sc->rl_twister_enable);
 659         ctx = device_get_sysctl_ctx(sc->rl_dev);
 660         children = SYSCTL_CHILDREN(device_get_sysctl_tree(sc->rl_dev));
 661         SYSCTL_ADD_INT(ctx, children, OID_AUTO, "twister_enable", CTLFLAG_RD,
 662            &sc->rl_twister_enable, 0, "");
 663
 664         mtx_init(&sc->rl_mtx, device_get_nameunit(dev), MTX_NETWORK_LOCK,
 665             MTX_DEF);
 666         callout_init_mtx(&sc->rl_stat_callout, &sc->rl_mtx, 0);
 667
 668         pci_enable_busmaster(dev);
 669
 670
 671         /*
 672          * Map control/status registers.
 673          * Default to using PIO access for this driver. On SMP systems,
 674          * there appear to be problems with memory mapped mode: it looks
 675          * like doing too many memory mapped access back to back in rapid
 676          * succession can hang the bus. I'm inclined to blame this on
 677          * crummy design/construction on the part of RealTek. Memory
 678          * mapped mode does appear to work on uniprocessor systems though.
 679          */
 680         prefer_iomap = 1;
 681         snprintf(tn, sizeof(tn), "dev.rl.%d.prefer_iomap", unit);
 682         TUNABLE_INT_FETCH(tn, &prefer_iomap);
 683         if (prefer_iomap) {
 684                 sc->rl_res_id = PCIR_BAR(0);
 685                 sc->rl_res_type = SYS_RES_IOPORT;
 686                 sc->rl_res = bus_alloc_resource_any(dev, sc->rl_res_type,
 687                     &sc->rl_res_id, RF_ACTIVE);
 688         }
 689         if (prefer_iomap == 0 || sc->rl_res == NULL) {
 690                 sc->rl_res_id = PCIR_BAR(1);
 691                 sc->rl_res_type = SYS_RES_MEMORY;
 692                 sc->rl_res = bus_alloc_resource_any(dev, sc->rl_res_type,
 693                     &sc->rl_res_id, RF_ACTIVE);
 694         }
 695         if (sc->rl_res == NULL) {
 696                 device_printf(dev, "couldn't map ports/memory\n");
 697                 error = ENXIO;
 698                 goto fail;
 699         }
 700
 701 #ifdef notdef
 702         /*
 703          * Detect the Realtek 8139B. For some reason, this chip is very
 704          * unstable when left to autoselect the media
 705          * The best workaround is to set the device to the required
 706          * media type or to set it to the 10 Meg speed.
 707          */
 708         if ((rman_get_end(sc->rl_res) - rman_get_start(sc->rl_res)) == 0xFF)
 709                 device_printf(dev,
 710 "Realtek 8139B detected. Warning, this may be unstable in autoselect mode\n");
 711 #endif
 712
 713         sc->rl_btag = rman_get_bustag(sc->rl_res);
 714         sc->rl_bhandle = rman_get_bushandle(sc->rl_res);
 715
 716         /* Allocate interrupt */
 717         rid = 0;
 718         sc->rl_irq[0] = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
 719             RF_SHAREABLE | RF_ACTIVE);
 720
 721         if (sc->rl_irq[0] == NULL) {
 722                 device_printf(dev, "couldn't map interrupt\n");
 723                 error = ENXIO;
 724                 goto fail;
 725         }
 726
 727         sc->rl_cfg0 = RL_8139_CFG0;
 728         sc->rl_cfg1 = RL_8139_CFG1;
 729         sc->rl_cfg2 = 0;
 730         sc->rl_cfg3 = RL_8139_CFG3;
 731         sc->rl_cfg4 = RL_8139_CFG4;
 732         sc->rl_cfg5 = RL_8139_CFG5;
 733
 734         /*
 735          * Reset the adapter. Only take the lock here as it's needed in
 736          * order to call rl_reset().
 737          */
 738         RL_LOCK(sc);
 739         rl_reset(sc);
 740         RL_UNLOCK(sc);
 741
 742         sc->rl_eecmd_read = RL_EECMD_READ_6BIT;
 743         rl_read_eeprom(sc, (uint8_t *)&rl_did, 0, 1, 0);
 744         if (rl_did != 0x8129)
 745                 sc->rl_eecmd_read = RL_EECMD_READ_8BIT;
 746
 747         /*
 748          * Get station address from the EEPROM.
 749          */
 750         rl_read_eeprom(sc, (uint8_t *)as, RL_EE_EADDR, 3, 0);
 751         for (i = 0; i < 3; i++) {
 752                 eaddr[(i * 2) + 0] = as[i] & 0xff;
 753                 eaddr[(i * 2) + 1] = as[i] >> 8;
 754         }
 755
 756         /*
 757          * Now read the exact device type from the EEPROM to find
 758          * out if it's an 8129 or 8139.
 759          */
 760         rl_read_eeprom(sc, (uint8_t *)&rl_did, RL_EE_PCI_DID, 1, 0);
 761
 762         t = rl_devs;
 763         sc->rl_type = 0;
 764         while(t->rl_name != NULL) {
 765                 if (rl_did == t->rl_did) {
 766                         sc->rl_type = t->rl_basetype;
 767                         break;
 768                 }
 769                 t++;
 770         }
 771
 772         if (sc->rl_type == 0) {
 773                 device_printf(dev, "unknown device ID: %x assuming 8139\n",
 774                     rl_did);
 775                 sc->rl_type = RL_8139;
 776                 /*
 777                  * Read RL_IDR register to get ethernet address as accessing
 778                  * EEPROM may not extract correct address.
 779                  */
 780                 for (i = 0; i < ETHER_ADDR_LEN; i++)
 781                         eaddr[i] = CSR_READ_1(sc, RL_IDR0 + i);
 782         }
 783
 784         if ((error = rl_dma_alloc(sc)) != 0)
 785                 goto fail;
 786
 787         ifp = sc->rl_ifp = if_alloc(IFT_ETHER);
 788         if (ifp == NULL) {
 789                 device_printf(dev, "can not if_alloc()\n");
 790                 error = ENOSPC;
 791                 goto fail;
 792         }
 793
 794 #define RL_PHYAD_INTERNAL       0
 795
 796         /* Do MII setup */
 797         phy = MII_PHY_ANY;
 798         if (sc->rl_type == RL_8139)
 799                 phy = RL_PHYAD_INTERNAL;
 800         error = mii_attach(dev, &sc->rl_miibus, ifp, rl_ifmedia_upd,
 801             rl_ifmedia_sts, BMSR_DEFCAPMASK, phy, MII_OFFSET_ANY, 0);
 802         if (error != 0) {
 803                 device_printf(dev, "attaching PHYs failed\n");
 804                 goto fail;
 805         }
 806
 807         ifp->if_softc = sc;
 808         if_initname(ifp, device_get_name(dev), device_get_unit(dev));
 809         ifp->if_mtu = ETHERMTU;
 810         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 811         ifp->if_ioctl = rl_ioctl;
 812         ifp->if_start = rl_start;
 813         ifp->if_init = rl_init;
 814         ifp->if_capabilities = IFCAP_VLAN_MTU;
 815         /* Check WOL for RTL8139B or newer controllers. */
 816         if (sc->rl_type == RL_8139 &&
 817             pci_find_cap(sc->rl_dev, PCIY_PMG, &pmc) == 0) {
 818                 hwrev = CSR_READ_4(sc, RL_TXCFG) & RL_TXCFG_HWREV;
 819                 switch (hwrev) {
 820                 case RL_HWREV_8139B:
 821                 case RL_HWREV_8130:
 822                 case RL_HWREV_8139C:
 823                 case RL_HWREV_8139D:
 824                 case RL_HWREV_8101:
 825                 case RL_HWREV_8100:
 826                         ifp->if_capabilities |= IFCAP_WOL;
 827                         /* Disable WOL. */
 828                         rl_clrwol(sc);
 829                         break;
 830                 default:
 831                         break;
 832                 }
 833         }
 834         ifp->if_capenable = ifp->if_capabilities;
 835         ifp->if_capenable &= ~(IFCAP_WOL_UCAST | IFCAP_WOL_MCAST);
 836 #ifdef DEVICE_POLLING
 837         ifp->if_capabilities |= IFCAP_POLLING;
 838 #endif
 839         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
 840         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
 841         IFQ_SET_READY(&ifp->if_snd);
 842
 843         /*
 844          * Call MI attach routine.
 845          */
 846         ether_ifattach(ifp, eaddr);
 847
 848         /* Hook interrupt last to avoid having to lock softc */
 849         error = bus_setup_intr(dev, sc->rl_irq[0], INTR_TYPE_NET | INTR_MPSAFE,
 850             NULL, rl_intr, sc, &sc->rl_intrhand[0]);
 851         if (error) {
 852                 device_printf(sc->rl_dev, "couldn't set up irq\n");
 853                 ether_ifdetach(ifp);
 854         }
 855
 856 fail:
 857         if (error)
 858                 rl_detach(dev);
 859
 860         return (error);
 861 }
 862
 863 /*
 864  * Shutdown hardware and free up resources. This can be called any
 865  * time after the mutex has been initialized. It is called in both
 866  * the error case in attach and the normal detach case so it needs
 867  * to be careful about only freeing resources that have actually been
 868  * allocated.
 869  */
 870 static int
 871 rl_detach(device_t dev)
 872 {
 873         struct rl_softc         *sc;
 874         struct ifnet            *ifp;
 875
 876         sc = device_get_softc(dev);
 877         ifp = sc->rl_ifp;
 878
 879         KASSERT(mtx_initialized(&sc->rl_mtx), ("rl mutex not initialized"));
 880
 881 #ifdef DEVICE_POLLING
 882         if (ifp->if_capenable & IFCAP_POLLING)
 883                 ether_poll_deregister(ifp);
 884 #endif
 885         /* These should only be active if attach succeeded */
 886         if (device_is_attached(dev)) {
 887                 RL_LOCK(sc);
 888                 rl_stop(sc);
 889                 RL_UNLOCK(sc);
 890                 callout_drain(&sc->rl_stat_callout);
 891                 ether_ifdetach(ifp);
 892         }
 893 #if 0
 894         sc->suspended = 1;
 895 #endif
 896         if (sc->rl_miibus)
 897                 device_delete_child(dev, sc->rl_miibus);
 898         bus_generic_detach(dev);
 899
 900         if (sc->rl_intrhand[0])
 901                 bus_teardown_intr(dev, sc->rl_irq[0], sc->rl_intrhand[0]);
 902         if (sc->rl_irq[0])
 903                 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->rl_irq[0]);
 904         if (sc->rl_res)
 905                 bus_release_resource(dev, sc->rl_res_type, sc->rl_res_id,
 906                     sc->rl_res);
 907
 908         if (ifp)
 909                 if_free(ifp);
 910
 911         rl_dma_free(sc);
 912
 913         mtx_destroy(&sc->rl_mtx);
 914
 915         return (0);
 916 }
 917
 918 static int
 919 rl_dma_alloc(struct rl_softc *sc)
 920 {
 921         struct rl_dmamap_arg    ctx;
 922         int                     error, i;
 923
 924         /*
 925          * Allocate the parent bus DMA tag appropriate for PCI.
 926          */
 927         error = bus_dma_tag_create(bus_get_dma_tag(sc->rl_dev), /* parent */
 928             1, 0,                       /* alignment, boundary */
 929             BUS_SPACE_MAXADDR_32BIT,    /* lowaddr */
 930             BUS_SPACE_MAXADDR,          /* highaddr */
 931             NULL, NULL,                 /* filter, filterarg */
 932             BUS_SPACE_MAXSIZE_32BIT, 0, /* maxsize, nsegments */
 933             BUS_SPACE_MAXSIZE_32BIT,    /* maxsegsize */
 934             0,                          /* flags */
 935             NULL, NULL,                 /* lockfunc, lockarg */
 936             &sc->rl_parent_tag);
 937         if (error) {
 938                 device_printf(sc->rl_dev,
 939                     "failed to create parent DMA tag.\n");
 940                 goto fail;
 941         }
 942         /* Create DMA tag for Rx memory block. */
 943         error = bus_dma_tag_create(sc->rl_parent_tag,   /* parent */
 944             RL_RX_8139_BUF_ALIGN, 0,    /* alignment, boundary */
 945             BUS_SPACE_MAXADDR,          /* lowaddr */
 946             BUS_SPACE_MAXADDR,          /* highaddr */
 947             NULL, NULL,                 /* filter, filterarg */
 948             RL_RXBUFLEN + RL_RX_8139_BUF_GUARD_SZ, 1,   /* maxsize,nsegments */
 949             RL_RXBUFLEN + RL_RX_8139_BUF_GUARD_SZ,      /* maxsegsize */
 950             0,                          /* flags */
 951             NULL, NULL,                 /* lockfunc, lockarg */
 952             &sc->rl_cdata.rl_rx_tag);
 953         if (error) {
 954                 device_printf(sc->rl_dev,
 955                     "failed to create Rx memory block DMA tag.\n");
 956                 goto fail;
 957         }
 958         /* Create DMA tag for Tx buffer. */
 959         error = bus_dma_tag_create(sc->rl_parent_tag,   /* parent */
 960             RL_TX_8139_BUF_ALIGN, 0,    /* alignment, boundary */
 961             BUS_SPACE_MAXADDR,          /* lowaddr */
 962             BUS_SPACE_MAXADDR,          /* highaddr */
 963             NULL, NULL,                 /* filter, filterarg */
 964             MCLBYTES, 1,                /* maxsize, nsegments */
 965             MCLBYTES,                   /* maxsegsize */
 966             0,                          /* flags */
 967             NULL, NULL,                 /* lockfunc, lockarg */
 968             &sc->rl_cdata.rl_tx_tag);
 969         if (error) {
 970                 device_printf(sc->rl_dev, "failed to create Tx DMA tag.\n");
 971                 goto fail;
 972         }
 973
 974         /*
 975          * Allocate DMA'able memory and load DMA map for Rx memory block.
 976          */
 977         error = bus_dmamem_alloc(sc->rl_cdata.rl_rx_tag,
 978             (void **)&sc->rl_cdata.rl_rx_buf, BUS_DMA_WAITOK |
 979             BUS_DMA_COHERENT | BUS_DMA_ZERO, &sc->rl_cdata.rl_rx_dmamap);
 980         if (error != 0) {
 981                 device_printf(sc->rl_dev,
 982                     "failed to allocate Rx DMA memory block.\n");
 983                 goto fail;
 984         }
 985         ctx.rl_busaddr = 0;
 986         error = bus_dmamap_load(sc->rl_cdata.rl_rx_tag,
 987             sc->rl_cdata.rl_rx_dmamap, sc->rl_cdata.rl_rx_buf,
 988             RL_RXBUFLEN + RL_RX_8139_BUF_GUARD_SZ, rl_dmamap_cb, &ctx,
 989             BUS_DMA_NOWAIT);
 990         if (error != 0 || ctx.rl_busaddr == 0) {
 991                 device_printf(sc->rl_dev,
 992                     "could not load Rx DMA memory block.\n");
 993                 goto fail;
 994         }
 995         sc->rl_cdata.rl_rx_buf_paddr = ctx.rl_busaddr;
 996
 997         /* Create DMA maps for Tx buffers. */
 998         for (i = 0; i < RL_TX_LIST_CNT; i++) {
 999                 sc->rl_cdata.rl_tx_chain[i] = NULL;
1000                 sc->rl_cdata.rl_tx_dmamap[i] = NULL;
1001                 error = bus_dmamap_create(sc->rl_cdata.rl_tx_tag, 0,
1002                     &sc->rl_cdata.rl_tx_dmamap[i]);
1003                 if (error != 0) {
1004                         device_printf(sc->rl_dev,
1005                             "could not create Tx dmamap.\n");
1006                         goto fail;
1007                 }
1008         }
1009
1010         /* Leave a few bytes before the start of the RX ring buffer. */
1011         sc->rl_cdata.rl_rx_buf_ptr = sc->rl_cdata.rl_rx_buf;
1012         sc->rl_cdata.rl_rx_buf += RL_RX_8139_BUF_RESERVE;
1013
1014 fail:
1015         return (error);
1016 }
1017
1018 static void
1019 rl_dma_free(struct rl_softc *sc)
1020 {
1021         int                     i;
1022
1023         /* Rx memory block. */
1024         if (sc->rl_cdata.rl_rx_tag != NULL) {
1025                 if (sc->rl_cdata.rl_rx_buf_paddr != 0)
1026                         bus_dmamap_unload(sc->rl_cdata.rl_rx_tag,
1027                             sc->rl_cdata.rl_rx_dmamap);
1028                 if (sc->rl_cdata.rl_rx_buf_ptr != NULL)
1029                         bus_dmamem_free(sc->rl_cdata.rl_rx_tag,
1030                             sc->rl_cdata.rl_rx_buf_ptr,
1031                             sc->rl_cdata.rl_rx_dmamap);
1032                 sc->rl_cdata.rl_rx_buf_ptr = NULL;
1033                 sc->rl_cdata.rl_rx_buf = NULL;
1034                 sc->rl_cdata.rl_rx_buf_paddr = 0;
1035                 bus_dma_tag_destroy(sc->rl_cdata.rl_rx_tag);
1036                 sc->rl_cdata.rl_tx_tag = NULL;
1037         }
1038
1039         /* Tx buffers. */
1040         if (sc->rl_cdata.rl_tx_tag != NULL) {
1041                 for (i = 0; i < RL_TX_LIST_CNT; i++) {
1042                         if (sc->rl_cdata.rl_tx_dmamap[i] != NULL) {
1043                                 bus_dmamap_destroy(
1044                                     sc->rl_cdata.rl_tx_tag,
1045                                     sc->rl_cdata.rl_tx_dmamap[i]);
1046                                 sc->rl_cdata.rl_tx_dmamap[i] = NULL;
1047                         }
1048                 }
1049                 bus_dma_tag_destroy(sc->rl_cdata.rl_tx_tag);
1050                 sc->rl_cdata.rl_tx_tag = NULL;
1051         }
1052
1053         if (sc->rl_parent_tag != NULL) {
1054                 bus_dma_tag_destroy(sc->rl_parent_tag);
1055                 sc->rl_parent_tag = NULL;
1056         }
1057 }
1058
1059 /*
1060  * Initialize the transmit descriptors.
1061  */
1062 static int
1063 rl_list_tx_init(struct rl_softc *sc)
1064 {
1065         struct rl_chain_data    *cd;
1066         int                     i;
1067
1068         RL_LOCK_ASSERT(sc);
1069
1070         cd = &sc->rl_cdata;
1071         for (i = 0; i < RL_TX_LIST_CNT; i++) {
1072                 cd->rl_tx_chain[i] = NULL;
1073                 CSR_WRITE_4(sc,
1074                     RL_TXADDR0 + (i * sizeof(uint32_t)), 0x0000000);
1075         }
1076
1077         sc->rl_cdata.cur_tx = 0;
1078         sc->rl_cdata.last_tx = 0;
1079
1080         return (0);
1081 }
1082
1083 static int
1084 rl_list_rx_init(struct rl_softc *sc)
1085 {
1086
1087         RL_LOCK_ASSERT(sc);
1088
1089         bzero(sc->rl_cdata.rl_rx_buf_ptr,
1090             RL_RXBUFLEN + RL_RX_8139_BUF_GUARD_SZ);
1091         bus_dmamap_sync(sc->rl_cdata.rl_tx_tag, sc->rl_cdata.rl_rx_dmamap,
1092             BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
1093
1094         return (0);
1095 }
1096
1097 /*
1098  * A frame has been uploaded: pass the resulting mbuf chain up to
1099  * the higher level protocols.
1100  *
1101  * You know there's something wrong with a PCI bus-master chip design
1102  * when you have to use m_devget().
1103  *
1104  * The receive operation is badly documented in the datasheet, so I'll
1105  * attempt to document it here. The driver provides a buffer area and
1106  * places its base address in the RX buffer start address register.
1107  * The chip then begins copying frames into the RX buffer. Each frame
1108  * is preceded by a 32-bit RX status word which specifies the length
1109  * of the frame and certain other status bits. Each frame (starting with
1110  * the status word) is also 32-bit aligned. The frame length is in the
1111  * first 16 bits of the status word; the lower 15 bits correspond with
1112  * the 'rx status register' mentioned in the datasheet.
1113  *
1114  * Note: to make the Alpha happy, the frame payload needs to be aligned
1115  * on a 32-bit boundary. To achieve this, we pass RL_ETHER_ALIGN (2 bytes)
1116  * as the offset argument to m_devget().
1117  */
1118 static int
1119 rl_rxeof(struct rl_softc *sc)
1120 {
1121         struct mbuf             *m;
1122         struct ifnet            *ifp = sc->rl_ifp;
1123         uint8_t                 *rxbufpos;
1124         int                     total_len = 0;
1125         int                     wrap = 0;
1126         int                     rx_npkts = 0;
1127         uint32_t                rxstat;
1128         uint16_t                cur_rx;
1129         uint16_t                limit;
1130         uint16_t                max_bytes, rx_bytes = 0;
1131
1132         RL_LOCK_ASSERT(sc);
1133
1134         bus_dmamap_sync(sc->rl_cdata.rl_rx_tag, sc->rl_cdata.rl_rx_dmamap,
1135             BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
1136
1137         cur_rx = (CSR_READ_2(sc, RL_CURRXADDR) + 16) % RL_RXBUFLEN;
1138
1139         /* Do not try to read past this point. */
1140         limit = CSR_READ_2(sc, RL_CURRXBUF) % RL_RXBUFLEN;
1141
1142         if (limit < cur_rx)
1143                 max_bytes = (RL_RXBUFLEN - cur_rx) + limit;
1144         else
1145                 max_bytes = limit - cur_rx;
1146
1147         while((CSR_READ_1(sc, RL_COMMAND) & RL_CMD_EMPTY_RXBUF) == 0) {
1148 #ifdef DEVICE_POLLING
1149                 if (ifp->if_capenable & IFCAP_POLLING) {
1150                         if (sc->rxcycles <= 0)
1151                                 break;
1152                         sc->rxcycles--;
1153                 }
1154 #endif
1155                 rxbufpos = sc->rl_cdata.rl_rx_buf + cur_rx;
1156                 rxstat = le32toh(*(uint32_t *)rxbufpos);
1157
1158                 /*
1159                  * Here's a totally undocumented fact for you. When the
1160                  * RealTek chip is in the process of copying a packet into
1161                  * RAM for you, the length will be 0xfff0. If you spot a
1162                  * packet header with this value, you need to stop. The
1163                  * datasheet makes absolutely no mention of this and
1164                  * RealTek should be shot for this.
1165                  */
1166                 total_len = rxstat >> 16;
1167                 if (total_len == RL_RXSTAT_UNFINISHED)
1168                         break;
1169
1170                 if (!(rxstat & RL_RXSTAT_RXOK) ||
1171                     total_len < ETHER_MIN_LEN ||
1172                     total_len > ETHER_MAX_LEN + ETHER_VLAN_ENCAP_LEN) {
1173                         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
1174                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1175                         rl_init_locked(sc);
1176                         return (rx_npkts);
1177                 }
1178
1179                 /* No errors; receive the packet. */
1180                 rx_bytes += total_len + 4;
1181
1182                 /*
1183                  * XXX The RealTek chip includes the CRC with every
1184                  * received frame, and there's no way to turn this
1185                  * behavior off (at least, I can't find anything in
1186                  * the manual that explains how to do it) so we have
1187                  * to trim off the CRC manually.
1188                  */
1189                 total_len -= ETHER_CRC_LEN;
1190
1191                 /*
1192                  * Avoid trying to read more bytes than we know
1193                  * the chip has prepared for us.
1194                  */
1195                 if (rx_bytes > max_bytes)
1196                         break;
1197
1198                 rxbufpos = sc->rl_cdata.rl_rx_buf +
1199                         ((cur_rx + sizeof(uint32_t)) % RL_RXBUFLEN);
1200                 if (rxbufpos == (sc->rl_cdata.rl_rx_buf + RL_RXBUFLEN))
1201                         rxbufpos = sc->rl_cdata.rl_rx_buf;
1202
1203                 wrap = (sc->rl_cdata.rl_rx_buf + RL_RXBUFLEN) - rxbufpos;
1204                 if (total_len > wrap) {
1205                         m = m_devget(rxbufpos, total_len, RL_ETHER_ALIGN, ifp,
1206                             NULL);
1207                         if (m != NULL)
1208                                 m_copyback(m, wrap, total_len - wrap,
1209                                         sc->rl_cdata.rl_rx_buf);
1210                         cur_rx = (total_len - wrap + ETHER_CRC_LEN);
1211                 } else {
1212                         m = m_devget(rxbufpos, total_len, RL_ETHER_ALIGN, ifp,
1213                             NULL);
1214                         cur_rx += total_len + 4 + ETHER_CRC_LEN;
1215                 }
1216
1217                 /* Round up to 32-bit boundary. */
1218                 cur_rx = (cur_rx + 3) & ~3;
1219                 CSR_WRITE_2(sc, RL_CURRXADDR, cur_rx - 16);
1220
1221                 if (m == NULL) {
1222                         if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
1223                         continue;
1224                 }
1225
1226                 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
1227                 RL_UNLOCK(sc);
1228                 (*ifp->if_input)(ifp, m);
1229                 RL_LOCK(sc);
1230                 rx_npkts++;
1231         }
1232
1233         /* No need to sync Rx memory block as we didn't modify it. */
1234         return (rx_npkts);
1235 }
1236
1237 /*
1238  * A frame was downloaded to the chip. It's safe for us to clean up
1239  * the list buffers.
1240  */
1241 static void
1242 rl_txeof(struct rl_softc *sc)
1243 {
1244         struct ifnet            *ifp = sc->rl_ifp;
1245         uint32_t                txstat;
1246
1247         RL_LOCK_ASSERT(sc);
1248
1249         /*
1250          * Go through our tx list and free mbufs for those
1251          * frames that have been uploaded.
1252          */
1253         do {
1254                 if (RL_LAST_TXMBUF(sc) == NULL)
1255                         break;
1256                 txstat = CSR_READ_4(sc, RL_LAST_TXSTAT(sc));
1257                 if (!(txstat & (RL_TXSTAT_TX_OK|
1258                     RL_TXSTAT_TX_UNDERRUN|RL_TXSTAT_TXABRT)))
1259                         break;
1260
1261                 if_inc_counter(ifp, IFCOUNTER_COLLISIONS, (txstat & RL_TXSTAT_COLLCNT) >> 24);
1262
1263                 bus_dmamap_sync(sc->rl_cdata.rl_tx_tag, RL_LAST_DMAMAP(sc),
1264                     BUS_DMASYNC_POSTWRITE);
1265                 bus_dmamap_unload(sc->rl_cdata.rl_tx_tag, RL_LAST_DMAMAP(sc));
1266                 m_freem(RL_LAST_TXMBUF(sc));
1267                 RL_LAST_TXMBUF(sc) = NULL;
1268                 /*
1269                  * If there was a transmit underrun, bump the TX threshold.
1270                  * Make sure not to overflow the 63 * 32byte we can address
1271                  * with the 6 available bit.
1272                  */
1273                 if ((txstat & RL_TXSTAT_TX_UNDERRUN) &&
1274                     (sc->rl_txthresh < 2016))
1275                         sc->rl_txthresh += 32;
1276                 if (txstat & RL_TXSTAT_TX_OK)
1277                         if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
1278                 else {
1279                         int                     oldthresh;
1280                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1281                         if ((txstat & RL_TXSTAT_TXABRT) ||
1282                             (txstat & RL_TXSTAT_OUTOFWIN))
1283                                 CSR_WRITE_4(sc, RL_TXCFG, RL_TXCFG_CONFIG);
1284                         oldthresh = sc->rl_txthresh;
1285                         /* error recovery */
1286                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1287                         rl_init_locked(sc);
1288                         /* restore original threshold */
1289                         sc->rl_txthresh = oldthresh;
1290                         return;
1291                 }
1292                 RL_INC(sc->rl_cdata.last_tx);
1293                 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
1294         } while (sc->rl_cdata.last_tx != sc->rl_cdata.cur_tx);
1295
1296         if (RL_LAST_TXMBUF(sc) == NULL)
1297                 sc->rl_watchdog_timer = 0;
1298 }
1299
1300 static void
1301 rl_twister_update(struct rl_softc *sc)
1302 {
1303         uint16_t linktest;
1304         /*
1305          * Table provided by RealTek (Kinston <shangh@realtek.com.tw>) for
1306          * Linux driver.  Values undocumented otherwise.
1307          */
1308         static const uint32_t param[4][4] = {
1309                 {0xcb39de43, 0xcb39ce43, 0xfb38de03, 0xcb38de43},
1310                 {0xcb39de43, 0xcb39ce43, 0xcb39ce83, 0xcb39ce83},
1311                 {0xcb39de43, 0xcb39ce43, 0xcb39ce83, 0xcb39ce83},
1312                 {0xbb39de43, 0xbb39ce43, 0xbb39ce83, 0xbb39ce83}
1313         };
1314
1315         /*
1316          * Tune the so-called twister registers of the RTL8139.  These
1317          * are used to compensate for impedance mismatches.  The
1318          * method for tuning these registers is undocumented and the
1319          * following procedure is collected from public sources.
1320          */
1321         switch (sc->rl_twister)
1322         {
1323         case CHK_LINK:
1324                 /*
1325                  * If we have a sufficient link, then we can proceed in
1326                  * the state machine to the next stage.  If not, then
1327                  * disable further tuning after writing sane defaults.
1328                  */
1329                 if (CSR_READ_2(sc, RL_CSCFG) & RL_CSCFG_LINK_OK) {
1330                         CSR_WRITE_2(sc, RL_CSCFG, RL_CSCFG_LINK_DOWN_OFF_CMD);
1331                         sc->rl_twister = FIND_ROW;
1332                 } else {
1333                         CSR_WRITE_2(sc, RL_CSCFG, RL_CSCFG_LINK_DOWN_CMD);
1334                         CSR_WRITE_4(sc, RL_NWAYTST, RL_NWAYTST_CBL_TEST);
1335                         CSR_WRITE_4(sc, RL_PARA78, RL_PARA78_DEF);
1336                         CSR_WRITE_4(sc, RL_PARA7C, RL_PARA7C_DEF);
1337                         sc->rl_twister = DONE;
1338                 }
1339                 break;
1340         case FIND_ROW:
1341                 /*
1342                  * Read how long it took to see the echo to find the tuning
1343                  * row to use.
1344                  */
1345                 linktest = CSR_READ_2(sc, RL_CSCFG) & RL_CSCFG_STATUS;
1346                 if (linktest == RL_CSCFG_ROW3)
1347                         sc->rl_twist_row = 3;
1348                 else if (linktest == RL_CSCFG_ROW2)
1349                         sc->rl_twist_row = 2;
1350                 else if (linktest == RL_CSCFG_ROW1)
1351                         sc->rl_twist_row = 1;
1352                 else
1353                         sc->rl_twist_row = 0;
1354                 sc->rl_twist_col = 0;
1355                 sc->rl_twister = SET_PARAM;
1356                 break;
1357         case SET_PARAM:
1358                 if (sc->rl_twist_col == 0)
1359                         CSR_WRITE_4(sc, RL_NWAYTST, RL_NWAYTST_RESET);
1360                 CSR_WRITE_4(sc, RL_PARA7C,
1361                     param[sc->rl_twist_row][sc->rl_twist_col]);
1362                 if (++sc->rl_twist_col == 4) {
1363                         if (sc->rl_twist_row == 3)
1364                                 sc->rl_twister = RECHK_LONG;
1365                         else
1366                                 sc->rl_twister = DONE;
1367                 }
1368                 break;
1369         case RECHK_LONG:
1370                 /*
1371                  * For long cables, we have to double check to make sure we
1372                  * don't mistune.
1373                  */
1374                 linktest = CSR_READ_2(sc, RL_CSCFG) & RL_CSCFG_STATUS;
1375                 if (linktest == RL_CSCFG_ROW3)
1376                         sc->rl_twister = DONE;
1377                 else {
1378                         CSR_WRITE_4(sc, RL_PARA7C, RL_PARA7C_RETUNE);
1379                         sc->rl_twister = RETUNE;
1380                 }
1381                 break;
1382         case RETUNE:
1383                 /* Retune for a shorter cable (try column 2) */
1384                 CSR_WRITE_4(sc, RL_NWAYTST, RL_NWAYTST_CBL_TEST);
1385                 CSR_WRITE_4(sc, RL_PARA78, RL_PARA78_DEF);
1386                 CSR_WRITE_4(sc, RL_PARA7C, RL_PARA7C_DEF);
1387                 CSR_WRITE_4(sc, RL_NWAYTST, RL_NWAYTST_RESET);
1388                 sc->rl_twist_row--;
1389                 sc->rl_twist_col = 0;
1390                 sc->rl_twister = SET_PARAM;
1391                 break;
1392
1393         case DONE:
1394                 break;
1395         }
1396
1397 }
1398
1399 static void
1400 rl_tick(void *xsc)
1401 {
1402         struct rl_softc         *sc = xsc;
1403         struct mii_data         *mii;
1404         int ticks;
1405
1406         RL_LOCK_ASSERT(sc);
1407         /*
1408          * If we're doing the twister cable calibration, then we need to defer
1409          * watchdog timeouts.  This is a no-op in normal operations, but
1410          * can falsely trigger when the cable calibration takes a while and
1411          * there was traffic ready to go when rl was started.
1412          *
1413          * We don't defer mii_tick since that updates the mii status, which
1414          * helps the twister process, at least according to similar patches
1415          * for the Linux driver I found online while doing the fixes.  Worst
1416          * case is a few extra mii reads during calibration.
1417          */
1418         mii = device_get_softc(sc->rl_miibus);
1419         mii_tick(mii);
1420         if ((sc->rl_flags & RL_FLAG_LINK) == 0)
1421                 rl_miibus_statchg(sc->rl_dev);
1422         if (sc->rl_twister_enable) {
1423                 if (sc->rl_twister == DONE)
1424                         rl_watchdog(sc);
1425                 else
1426                         rl_twister_update(sc);
1427                 if (sc->rl_twister == DONE)
1428                         ticks = hz;
1429                 else
1430                         ticks = hz / 10;
1431         } else {
1432                 rl_watchdog(sc);
1433                 ticks = hz;
1434         }
1435
1436         callout_reset(&sc->rl_stat_callout, ticks, rl_tick, sc);
1437 }
1438
1439 #ifdef DEVICE_POLLING
1440 static int
1441 rl_poll(struct ifnet *ifp, enum poll_cmd cmd, int count)
1442 {
1443         struct rl_softc *sc = ifp->if_softc;
1444         int rx_npkts = 0;
1445
1446         RL_LOCK(sc);
1447         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1448                 rx_npkts = rl_poll_locked(ifp, cmd, count);
1449         RL_UNLOCK(sc);
1450         return (rx_npkts);
1451 }
1452
1453 static int
1454 rl_poll_locked(struct ifnet *ifp, enum poll_cmd cmd, int count)
1455 {
1456         struct rl_softc *sc = ifp->if_softc;
1457         int rx_npkts;
1458
1459         RL_LOCK_ASSERT(sc);
1460
1461         sc->rxcycles = count;
1462         rx_npkts = rl_rxeof(sc);
1463         rl_txeof(sc);
1464
1465         if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
1466                 rl_start_locked(ifp);
1467
1468         if (cmd == POLL_AND_CHECK_STATUS) {
1469                 uint16_t        status;
1470
1471                 /* We should also check the status register. */
1472                 status = CSR_READ_2(sc, RL_ISR);
1473                 if (status == 0xffff)
1474                         return (rx_npkts);
1475                 if (status != 0)
1476                         CSR_WRITE_2(sc, RL_ISR, status);
1477
1478                 /* XXX We should check behaviour on receiver stalls. */
1479
1480                 if (status & RL_ISR_SYSTEM_ERR) {
1481                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1482                         rl_init_locked(sc);
1483                 }
1484         }
1485         return (rx_npkts);
1486 }
1487 #endif /* DEVICE_POLLING */
1488
1489 static void
1490 rl_intr(void *arg)
1491 {
1492         struct rl_softc         *sc = arg;
1493         struct ifnet            *ifp = sc->rl_ifp;
1494         uint16_t                status;
1495         int                     count;
1496
1497         RL_LOCK(sc);
1498
1499         if (sc->suspended)
1500                 goto done_locked;
1501
1502 #ifdef DEVICE_POLLING
1503         if  (ifp->if_capenable & IFCAP_POLLING)
1504                 goto done_locked;
1505 #endif
1506
1507         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1508                 goto done_locked2;
1509         status = CSR_READ_2(sc, RL_ISR);
1510         if (status == 0xffff || (status & RL_INTRS) == 0)
1511                 goto done_locked;
1512         /*
1513          * Ours, disable further interrupts.
1514          */
1515         CSR_WRITE_2(sc, RL_IMR, 0);
1516         for (count = 16; count > 0; count--) {
1517                 CSR_WRITE_2(sc, RL_ISR, status);
1518                 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
1519                         if (status & (RL_ISR_RX_OK | RL_ISR_RX_ERR))
1520                                 rl_rxeof(sc);
1521                         if (status & (RL_ISR_TX_OK | RL_ISR_TX_ERR))
1522                                 rl_txeof(sc);
1523                         if (status & RL_ISR_SYSTEM_ERR) {
1524                                 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1525                                 rl_init_locked(sc);
1526                                 RL_UNLOCK(sc);
1527                                 return;
1528                         }
1529                 }
1530                 status = CSR_READ_2(sc, RL_ISR);
1531                 /* If the card has gone away, the read returns 0xffff. */
1532                 if (status == 0xffff || (status & RL_INTRS) == 0)
1533                         break;
1534         }
1535
1536         if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
1537                 rl_start_locked(ifp);
1538
1539 done_locked2:
1540         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1541                 CSR_WRITE_2(sc, RL_IMR, RL_INTRS);
1542 done_locked:
1543         RL_UNLOCK(sc);
1544 }
1545
1546 /*
1547  * Encapsulate an mbuf chain in a descriptor by coupling the mbuf data
1548  * pointers to the fragment pointers.
1549  */
1550 static int
1551 rl_encap(struct rl_softc *sc, struct mbuf **m_head)
1552 {
1553         struct mbuf             *m;
1554         bus_dma_segment_t       txsegs[1];
1555         int                     error, nsegs, padlen;
1556
1557         RL_LOCK_ASSERT(sc);
1558
1559         m = *m_head;
1560         padlen = 0;
1561         /*
1562          * Hardware doesn't auto-pad, so we have to make sure
1563          * pad short frames out to the minimum frame length.
1564          */
1565         if (m->m_pkthdr.len < RL_MIN_FRAMELEN)
1566                 padlen = RL_MIN_FRAMELEN - m->m_pkthdr.len;
1567         /*
1568          * The RealTek is brain damaged and wants longword-aligned
1569          * TX buffers, plus we can only have one fragment buffer
1570          * per packet. We have to copy pretty much all the time.
1571          */
1572         if (m->m_next != NULL || (mtod(m, uintptr_t) & 3) != 0 ||
1573             (padlen > 0 && M_TRAILINGSPACE(m) < padlen)) {
1574                 m = m_defrag(*m_head, M_NOWAIT);
1575                 if (m == NULL) {
1576                         m_freem(*m_head);
1577                         *m_head = NULL;
1578                         return (ENOMEM);
1579                 }
1580         }
1581         *m_head = m;
1582
1583         if (padlen > 0) {
1584                 /*
1585                  * Make security-conscious people happy: zero out the
1586                  * bytes in the pad area, since we don't know what
1587                  * this mbuf cluster buffer's previous user might
1588                  * have left in it.
1589                  */
1590                 bzero(mtod(m, char *) + m->m_pkthdr.len, padlen);
1591                 m->m_pkthdr.len += padlen;
1592                 m->m_len = m->m_pkthdr.len;
1593         }
1594
1595         error = bus_dmamap_load_mbuf_sg(sc->rl_cdata.rl_tx_tag,
1596             RL_CUR_DMAMAP(sc), m, txsegs, &nsegs, 0);
1597         if (error != 0)
1598                 return (error);
1599         if (nsegs == 0) {
1600                 m_freem(*m_head);
1601                 *m_head = NULL;
1602                 return (EIO);
1603         }
1604
1605         RL_CUR_TXMBUF(sc) = m;
1606         bus_dmamap_sync(sc->rl_cdata.rl_tx_tag, RL_CUR_DMAMAP(sc),
1607             BUS_DMASYNC_PREWRITE);
1608         CSR_WRITE_4(sc, RL_CUR_TXADDR(sc), RL_ADDR_LO(txsegs[0].ds_addr));
1609
1610         return (0);
1611 }
1612
1613 /*
1614  * Main transmit routine.
1615  */
1616 static void
1617 rl_start(struct ifnet *ifp)
1618 {
1619         struct rl_softc         *sc = ifp->if_softc;
1620
1621         RL_LOCK(sc);
1622         rl_start_locked(ifp);
1623         RL_UNLOCK(sc);
1624 }
1625
1626 static void
1627 rl_start_locked(struct ifnet *ifp)
1628 {
1629         struct rl_softc         *sc = ifp->if_softc;
1630         struct mbuf             *m_head = NULL;
1631
1632         RL_LOCK_ASSERT(sc);
1633
1634         if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
1635             IFF_DRV_RUNNING || (sc->rl_flags & RL_FLAG_LINK) == 0)
1636                 return;
1637
1638         while (RL_CUR_TXMBUF(sc) == NULL) {
1639
1640                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m_head);
1641
1642                 if (m_head == NULL)
1643                         break;
1644
1645                 if (rl_encap(sc, &m_head)) {
1646                         if (m_head == NULL)
1647                                 break;
1648                         IFQ_DRV_PREPEND(&ifp->if_snd, m_head);
1649                         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
1650                         break;
1651                 }
1652
1653                 /* Pass a copy of this mbuf chain to the bpf subsystem. */
1654                 BPF_MTAP(ifp, RL_CUR_TXMBUF(sc));
1655
1656                 /* Transmit the frame. */
1657                 CSR_WRITE_4(sc, RL_CUR_TXSTAT(sc),
1658                     RL_TXTHRESH(sc->rl_txthresh) |
1659                     RL_CUR_TXMBUF(sc)->m_pkthdr.len);
1660
1661                 RL_INC(sc->rl_cdata.cur_tx);
1662
1663                 /* Set a timeout in case the chip goes out to lunch. */
1664                 sc->rl_watchdog_timer = 5;
1665         }
1666
1667         /*
1668          * We broke out of the loop because all our TX slots are
1669          * full. Mark the NIC as busy until it drains some of the
1670          * packets from the queue.
1671          */
1672         if (RL_CUR_TXMBUF(sc) != NULL)
1673                 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
1674 }
1675
1676 static void
1677 rl_init(void *xsc)
1678 {
1679         struct rl_softc         *sc = xsc;
1680
1681         RL_LOCK(sc);
1682         rl_init_locked(sc);
1683         RL_UNLOCK(sc);
1684 }
1685
1686 static void
1687 rl_init_locked(struct rl_softc *sc)
1688 {
1689         struct ifnet            *ifp = sc->rl_ifp;
1690         struct mii_data         *mii;
1691         uint32_t                eaddr[2];
1692
1693         RL_LOCK_ASSERT(sc);
1694
1695         mii = device_get_softc(sc->rl_miibus);
1696
1697         if ((ifp->if_drv_flags & IFF_DRV_RUNNING) != 0)
1698                 return;
1699
1700         /*
1701          * Cancel pending I/O and free all RX/TX buffers.
1702          */
1703         rl_stop(sc);
1704
1705         rl_reset(sc);
1706         if (sc->rl_twister_enable) {
1707                 /*
1708                  * Reset twister register tuning state.  The twister
1709                  * registers and their tuning are undocumented, but
1710                  * are necessary to cope with bad links.  rl_twister =
1711                  * DONE here will disable this entirely.
1712                  */
1713                 sc->rl_twister = CHK_LINK;
1714         }
1715
1716         /*
1717          * Init our MAC address.  Even though the chipset
1718          * documentation doesn't mention it, we need to enter "Config
1719          * register write enable" mode to modify the ID registers.
1720          */
1721         CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_WRITECFG);
1722         bzero(eaddr, sizeof(eaddr));
1723         bcopy(IF_LLADDR(sc->rl_ifp), eaddr, ETHER_ADDR_LEN);
1724         CSR_WRITE_STREAM_4(sc, RL_IDR0, eaddr[0]);
1725         CSR_WRITE_STREAM_4(sc, RL_IDR4, eaddr[1]);
1726         CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_OFF);
1727
1728         /* Init the RX memory block pointer register. */
1729         CSR_WRITE_4(sc, RL_RXADDR, sc->rl_cdata.rl_rx_buf_paddr +
1730             RL_RX_8139_BUF_RESERVE);
1731         /* Init TX descriptors. */
1732         rl_list_tx_init(sc);
1733         /* Init Rx memory block. */
1734         rl_list_rx_init(sc);
1735
1736         /*
1737          * Enable transmit and receive.
1738          */
1739         CSR_WRITE_1(sc, RL_COMMAND, RL_CMD_TX_ENB|RL_CMD_RX_ENB);
1740
1741         /*
1742          * Set the initial TX and RX configuration.
1743          */
1744         CSR_WRITE_4(sc, RL_TXCFG, RL_TXCFG_CONFIG);
1745         CSR_WRITE_4(sc, RL_RXCFG, RL_RXCFG_CONFIG);
1746
1747         /* Set RX filter. */
1748         rl_rxfilter(sc);
1749
1750 #ifdef DEVICE_POLLING
1751         /* Disable interrupts if we are polling. */
1752         if (ifp->if_capenable & IFCAP_POLLING)
1753                 CSR_WRITE_2(sc, RL_IMR, 0);
1754         else
1755 #endif
1756         /* Enable interrupts. */
1757         CSR_WRITE_2(sc, RL_IMR, RL_INTRS);
1758
1759         /* Set initial TX threshold */
1760         sc->rl_txthresh = RL_TX_THRESH_INIT;
1761
1762         /* Start RX/TX process. */
1763         CSR_WRITE_4(sc, RL_MISSEDPKT, 0);
1764
1765         /* Enable receiver and transmitter. */
1766         CSR_WRITE_1(sc, RL_COMMAND, RL_CMD_TX_ENB|RL_CMD_RX_ENB);
1767
1768         sc->rl_flags &= ~RL_FLAG_LINK;
1769         mii_mediachg(mii);
1770
1771         CSR_WRITE_1(sc, sc->rl_cfg1, RL_CFG1_DRVLOAD|RL_CFG1_FULLDUPLEX);
1772
1773         ifp->if_drv_flags |= IFF_DRV_RUNNING;
1774         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
1775
1776         callout_reset(&sc->rl_stat_callout, hz, rl_tick, sc);
1777 }
1778
1779 /*
1780  * Set media options.
1781  */
1782 static int
1783 rl_ifmedia_upd(struct ifnet *ifp)
1784 {
1785         struct rl_softc         *sc = ifp->if_softc;
1786         struct mii_data         *mii;
1787
1788         mii = device_get_softc(sc->rl_miibus);
1789
1790         RL_LOCK(sc);
1791         mii_mediachg(mii);
1792         RL_UNLOCK(sc);
1793
1794         return (0);
1795 }
1796
1797 /*
1798  * Report current media status.
1799  */
1800 static void
1801 rl_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
1802 {
1803         struct rl_softc         *sc = ifp->if_softc;
1804         struct mii_data         *mii;
1805
1806         mii = device_get_softc(sc->rl_miibus);
1807
1808         RL_LOCK(sc);
1809         mii_pollstat(mii);
1810         ifmr->ifm_active = mii->mii_media_active;
1811         ifmr->ifm_status = mii->mii_media_status;
1812         RL_UNLOCK(sc);
1813 }
1814
1815 static int
1816 rl_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
1817 {
1818         struct ifreq            *ifr = (struct ifreq *)data;
1819         struct mii_data         *mii;
1820         struct rl_softc         *sc = ifp->if_softc;
1821         int                     error = 0, mask;
1822
1823         switch (command) {
1824         case SIOCSIFFLAGS:
1825                 RL_LOCK(sc);
1826                 if (ifp->if_flags & IFF_UP) {
1827                         if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
1828                             ((ifp->if_flags ^ sc->rl_if_flags) &
1829                             (IFF_PROMISC | IFF_ALLMULTI)))
1830                                 rl_rxfilter(sc);
1831                         else
1832                                 rl_init_locked(sc);
1833                 } else if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1834                         rl_stop(sc);
1835                 sc->rl_if_flags = ifp->if_flags;
1836                 RL_UNLOCK(sc);
1837                 break;
1838         case SIOCADDMULTI:
1839         case SIOCDELMULTI:
1840                 RL_LOCK(sc);
1841                 rl_rxfilter(sc);
1842                 RL_UNLOCK(sc);
1843                 break;
1844         case SIOCGIFMEDIA:
1845         case SIOCSIFMEDIA:
1846                 mii = device_get_softc(sc->rl_miibus);
1847                 error = ifmedia_ioctl(ifp, ifr, &mii->mii_media, command);
1848                 break;
1849         case SIOCSIFCAP:
1850                 mask = ifr->ifr_reqcap ^ ifp->if_capenable;
1851 #ifdef DEVICE_POLLING
1852                 if (ifr->ifr_reqcap & IFCAP_POLLING &&
1853                     !(ifp->if_capenable & IFCAP_POLLING)) {
1854                         error = ether_poll_register(rl_poll, ifp);
1855                         if (error)
1856                                 return(error);
1857                         RL_LOCK(sc);
1858                         /* Disable interrupts */
1859                         CSR_WRITE_2(sc, RL_IMR, 0x0000);
1860                         ifp->if_capenable |= IFCAP_POLLING;
1861                         RL_UNLOCK(sc);
1862                         return (error);
1863
1864                 }
1865                 if (!(ifr->ifr_reqcap & IFCAP_POLLING) &&
1866                     ifp->if_capenable & IFCAP_POLLING) {
1867                         error = ether_poll_deregister(ifp);
1868                         /* Enable interrupts. */
1869                         RL_LOCK(sc);
1870                         CSR_WRITE_2(sc, RL_IMR, RL_INTRS);
1871                         ifp->if_capenable &= ~IFCAP_POLLING;
1872                         RL_UNLOCK(sc);
1873                         return (error);
1874                 }
1875 #endif /* DEVICE_POLLING */
1876                 if ((mask & IFCAP_WOL) != 0 &&
1877                     (ifp->if_capabilities & IFCAP_WOL) != 0) {
1878                         if ((mask & IFCAP_WOL_UCAST) != 0)
1879                                 ifp->if_capenable ^= IFCAP_WOL_UCAST;
1880                         if ((mask & IFCAP_WOL_MCAST) != 0)
1881                                 ifp->if_capenable ^= IFCAP_WOL_MCAST;
1882                         if ((mask & IFCAP_WOL_MAGIC) != 0)
1883                                 ifp->if_capenable ^= IFCAP_WOL_MAGIC;
1884                 }
1885                 break;
1886         default:
1887                 error = ether_ioctl(ifp, command, data);
1888                 break;
1889         }
1890
1891         return (error);
1892 }
1893
1894 static void
1895 rl_watchdog(struct rl_softc *sc)
1896 {
1897
1898         RL_LOCK_ASSERT(sc);
1899
1900         if (sc->rl_watchdog_timer == 0 || --sc->rl_watchdog_timer >0)
1901                 return;
1902
1903         device_printf(sc->rl_dev, "watchdog timeout\n");
1904         if_inc_counter(sc->rl_ifp, IFCOUNTER_OERRORS, 1);
1905
1906         rl_txeof(sc);
1907         rl_rxeof(sc);
1908         sc->rl_ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1909         rl_init_locked(sc);
1910 }
1911
1912 /*
1913  * Stop the adapter and free any mbufs allocated to the
1914  * RX and TX lists.
1915  */
1916 static void
1917 rl_stop(struct rl_softc *sc)
1918 {
1919         int                     i;
1920         struct ifnet            *ifp = sc->rl_ifp;
1921
1922         RL_LOCK_ASSERT(sc);
1923
1924         sc->rl_watchdog_timer = 0;
1925         callout_stop(&sc->rl_stat_callout);
1926         ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
1927         sc->rl_flags &= ~RL_FLAG_LINK;
1928
1929         CSR_WRITE_1(sc, RL_COMMAND, 0x00);
1930         CSR_WRITE_2(sc, RL_IMR, 0x0000);
1931         for (i = 0; i < RL_TIMEOUT; i++) {
1932                 DELAY(10);
1933                 if ((CSR_READ_1(sc, RL_COMMAND) &
1934                     (RL_CMD_RX_ENB | RL_CMD_TX_ENB)) == 0)
1935                         break;
1936         }
1937         if (i == RL_TIMEOUT)
1938                 device_printf(sc->rl_dev, "Unable to stop Tx/Rx MAC\n");
1939
1940         /*
1941          * Free the TX list buffers.
1942          */
1943         for (i = 0; i < RL_TX_LIST_CNT; i++) {
1944                 if (sc->rl_cdata.rl_tx_chain[i] != NULL) {
1945                         bus_dmamap_sync(sc->rl_cdata.rl_tx_tag,
1946                             sc->rl_cdata.rl_tx_dmamap[i],
1947                             BUS_DMASYNC_POSTWRITE);
1948                         bus_dmamap_unload(sc->rl_cdata.rl_tx_tag,
1949                             sc->rl_cdata.rl_tx_dmamap[i]);
1950                         m_freem(sc->rl_cdata.rl_tx_chain[i]);
1951                         sc->rl_cdata.rl_tx_chain[i] = NULL;
1952                         CSR_WRITE_4(sc, RL_TXADDR0 + (i * sizeof(uint32_t)),
1953                             0x0000000);
1954                 }
1955         }
1956 }
1957
1958 /*
1959  * Device suspend routine.  Stop the interface and save some PCI
1960  * settings in case the BIOS doesn't restore them properly on
1961  * resume.
1962  */
1963 static int
1964 rl_suspend(device_t dev)
1965 {
1966         struct rl_softc         *sc;
1967
1968         sc = device_get_softc(dev);
1969
1970         RL_LOCK(sc);
1971         rl_stop(sc);
1972         rl_setwol(sc);
1973         sc->suspended = 1;
1974         RL_UNLOCK(sc);
1975
1976         return (0);
1977 }
1978
1979 /*
1980  * Device resume routine.  Restore some PCI settings in case the BIOS
1981  * doesn't, re-enable busmastering, and restart the interface if
1982  * appropriate.
1983  */
1984 static int
1985 rl_resume(device_t dev)
1986 {
1987         struct rl_softc         *sc;
1988         struct ifnet            *ifp;
1989         int                     pmc;
1990         uint16_t                pmstat;
1991
1992         sc = device_get_softc(dev);
1993         ifp = sc->rl_ifp;
1994
1995         RL_LOCK(sc);
1996
1997         if ((ifp->if_capabilities & IFCAP_WOL) != 0 &&
1998             pci_find_cap(sc->rl_dev, PCIY_PMG, &pmc) == 0) {
1999                 /* Disable PME and clear PME status. */
2000                 pmstat = pci_read_config(sc->rl_dev,
2001                     pmc + PCIR_POWER_STATUS, 2);
2002                 if ((pmstat & PCIM_PSTAT_PMEENABLE) != 0) {
2003                         pmstat &= ~PCIM_PSTAT_PMEENABLE;
2004                         pci_write_config(sc->rl_dev,
2005                             pmc + PCIR_POWER_STATUS, pmstat, 2);
2006                 }
2007                 /*
2008                  * Clear WOL matching such that normal Rx filtering
2009                  * wouldn't interfere with WOL patterns.
2010                  */
2011                 rl_clrwol(sc);
2012         }
2013
2014         /* reinitialize interface if necessary */
2015         if (ifp->if_flags & IFF_UP)
2016                 rl_init_locked(sc);
2017
2018         sc->suspended = 0;
2019
2020         RL_UNLOCK(sc);
2021
2022         return (0);
2023 }
2024
2025 /*
2026  * Stop all chip I/O so that the kernel's probe routines don't
2027  * get confused by errant DMAs when rebooting.
2028  */
2029 static int
2030 rl_shutdown(device_t dev)
2031 {
2032         struct rl_softc         *sc;
2033
2034         sc = device_get_softc(dev);
2035
2036         RL_LOCK(sc);
2037         rl_stop(sc);
2038         /*
2039          * Mark interface as down since otherwise we will panic if
2040          * interrupt comes in later on, which can happen in some
2041          * cases.
2042          */
2043         sc->rl_ifp->if_flags &= ~IFF_UP;
2044         rl_setwol(sc);
2045         RL_UNLOCK(sc);
2046
2047         return (0);
2048 }
2049
2050 static void
2051 rl_setwol(struct rl_softc *sc)
2052 {
2053         struct ifnet            *ifp;
2054         int                     pmc;
2055         uint16_t                pmstat;
2056         uint8_t                 v;
2057
2058         RL_LOCK_ASSERT(sc);
2059
2060         ifp = sc->rl_ifp;
2061         if ((ifp->if_capabilities & IFCAP_WOL) == 0)
2062                 return;
2063         if (pci_find_cap(sc->rl_dev, PCIY_PMG, &pmc) != 0)
2064                 return;
2065
2066         /* Enable config register write. */
2067         CSR_WRITE_1(sc, RL_EECMD, RL_EE_MODE);
2068
2069         /* Enable PME. */
2070         v = CSR_READ_1(sc, sc->rl_cfg1);
2071         v &= ~RL_CFG1_PME;
2072         if ((ifp->if_capenable & IFCAP_WOL) != 0)
2073                 v |= RL_CFG1_PME;
2074         CSR_WRITE_1(sc, sc->rl_cfg1, v);
2075
2076         v = CSR_READ_1(sc, sc->rl_cfg3);
2077         v &= ~(RL_CFG3_WOL_LINK | RL_CFG3_WOL_MAGIC);
2078         if ((ifp->if_capenable & IFCAP_WOL_MAGIC) != 0)
2079                 v |= RL_CFG3_WOL_MAGIC;
2080         CSR_WRITE_1(sc, sc->rl_cfg3, v);
2081
2082         v = CSR_READ_1(sc, sc->rl_cfg5);
2083         v &= ~(RL_CFG5_WOL_BCAST | RL_CFG5_WOL_MCAST | RL_CFG5_WOL_UCAST);
2084         v &= ~RL_CFG5_WOL_LANWAKE;
2085         if ((ifp->if_capenable & IFCAP_WOL_UCAST) != 0)
2086                 v |= RL_CFG5_WOL_UCAST;
2087         if ((ifp->if_capenable & IFCAP_WOL_MCAST) != 0)
2088                 v |= RL_CFG5_WOL_MCAST | RL_CFG5_WOL_BCAST;
2089         if ((ifp->if_capenable & IFCAP_WOL) != 0)
2090                 v |= RL_CFG5_WOL_LANWAKE;
2091         CSR_WRITE_1(sc, sc->rl_cfg5, v);
2092
2093         /* Config register write done. */
2094         CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_OFF);
2095
2096         /* Request PME if WOL is requested. */
2097         pmstat = pci_read_config(sc->rl_dev, pmc + PCIR_POWER_STATUS, 2);
2098         pmstat &= ~(PCIM_PSTAT_PME | PCIM_PSTAT_PMEENABLE);
2099         if ((ifp->if_capenable & IFCAP_WOL) != 0)
2100                 pmstat |= PCIM_PSTAT_PME | PCIM_PSTAT_PMEENABLE;
2101         pci_write_config(sc->rl_dev, pmc + PCIR_POWER_STATUS, pmstat, 2);
2102 }
2103
2104 static void
2105 rl_clrwol(struct rl_softc *sc)
2106 {
2107         struct ifnet            *ifp;
2108         uint8_t                 v;
2109
2110         ifp = sc->rl_ifp;
2111         if ((ifp->if_capabilities & IFCAP_WOL) == 0)
2112                 return;
2113
2114         /* Enable config register write. */
2115         CSR_WRITE_1(sc, RL_EECMD, RL_EE_MODE);
2116
2117         v = CSR_READ_1(sc, sc->rl_cfg3);
2118         v &= ~(RL_CFG3_WOL_LINK | RL_CFG3_WOL_MAGIC);
2119         CSR_WRITE_1(sc, sc->rl_cfg3, v);
2120
2121         /* Config register write done. */
2122         CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_OFF);
2123
2124         v = CSR_READ_1(sc, sc->rl_cfg5);
2125         v &= ~(RL_CFG5_WOL_BCAST | RL_CFG5_WOL_MCAST | RL_CFG5_WOL_UCAST);
2126         v &= ~RL_CFG5_WOL_LANWAKE;
2127         CSR_WRITE_1(sc, sc->rl_cfg5, v);
2128 }