if_xe.c revision 1.26
1 /* $NetBSD: if_xe.c,v 1.26 2019/11/10 21:16:31 chs Exp $ */ 2 /* 3 * Copyright (c) 1998 Darrin B. Jewell 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, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __KERNEL_RCSID(0, "$NetBSD: if_xe.c,v 1.26 2019/11/10 21:16:31 chs Exp $"); 29 30 #include "opt_inet.h" 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/mbuf.h> 35 #include <sys/syslog.h> 36 #include <sys/socket.h> 37 #include <sys/device.h> 38 39 #include <net/if.h> 40 #include <net/if_ether.h> 41 #include <net/if_media.h> 42 43 #ifdef INET 44 #include <netinet/in.h> 45 #include <netinet/if_inarp.h> 46 #endif 47 48 #include <machine/autoconf.h> 49 #include <machine/cpu.h> 50 #include <machine/intr.h> 51 #include <machine/bus.h> 52 53 #include <next68k/next68k/isr.h> 54 55 #include <next68k/dev/mb8795reg.h> 56 #include <next68k/dev/mb8795var.h> 57 58 #include <next68k/dev/bmapreg.h> 59 #include <next68k/dev/intiovar.h> 60 #include <next68k/dev/nextdmareg.h> 61 #include <next68k/dev/nextdmavar.h> 62 63 #include <next68k/dev/if_xevar.h> 64 #include <next68k/dev/if_xereg.h> 65 66 #ifdef DEBUG 67 #define XE_DEBUG 68 #endif 69 70 #ifdef XE_DEBUG 71 int xe_debug = 0; 72 #define DPRINTF(x) if (xe_debug) printf x; 73 #else 74 #define DPRINTF(x) 75 #endif 76 #define PRINTF(x) printf x; 77 78 extern int turbo; 79 80 int xe_match(device_t, cfdata_t, void *); 81 void xe_attach(device_t, device_t, void *); 82 int xe_tint(void *); 83 int xe_rint(void *); 84 85 struct mbuf *xe_dma_rxmap_load(struct mb8795_softc *, bus_dmamap_t); 86 87 bus_dmamap_t xe_dma_rx_continue(void *); 88 void xe_dma_rx_completed(bus_dmamap_t, void *); 89 bus_dmamap_t xe_dma_tx_continue(void *); 90 void xe_dma_tx_completed(bus_dmamap_t, void *); 91 void xe_dma_rx_shutdown(void *); 92 void xe_dma_tx_shutdown(void *); 93 94 static void findchannel_defer(device_t); 95 96 CFATTACH_DECL_NEW(xe, sizeof(struct xe_softc), 97 xe_match, xe_attach, NULL, NULL); 98 99 static int xe_dma_medias[] = { 100 IFM_ETHER | IFM_AUTO, 101 IFM_ETHER | IFM_10_T, 102 IFM_ETHER | IFM_10_2, 103 }; 104 static int nxe_dma_medias = __arraycount(xe_dma_medias); 105 106 static int attached = 0; 107 108 /* 109 * Functions and the switch for the MI code. 110 */ 111 u_char xe_read_reg(struct mb8795_softc *, int); 112 void xe_write_reg(struct mb8795_softc *, int, u_char); 113 void xe_dma_reset(struct mb8795_softc *); 114 void xe_dma_rx_setup(struct mb8795_softc *); 115 void xe_dma_rx_go(struct mb8795_softc *); 116 struct mbuf * xe_dma_rx_mbuf(struct mb8795_softc *); 117 void xe_dma_tx_setup(struct mb8795_softc *); 118 void xe_dma_tx_go(struct mb8795_softc *); 119 int xe_dma_tx_mbuf(struct mb8795_softc *, struct mbuf *); 120 int xe_dma_tx_isactive(struct mb8795_softc *); 121 122 struct mb8795_glue xe_glue = { 123 xe_read_reg, 124 xe_write_reg, 125 xe_dma_reset, 126 xe_dma_rx_setup, 127 xe_dma_rx_go, 128 xe_dma_rx_mbuf, 129 xe_dma_tx_setup, 130 xe_dma_tx_go, 131 xe_dma_tx_mbuf, 132 xe_dma_tx_isactive, 133 }; 134 135 int 136 xe_match(device_t parent, cfdata_t match, void *aux) 137 { 138 struct intio_attach_args *ia = (struct intio_attach_args *)aux; 139 140 if (attached) 141 return 0; 142 143 ia->ia_addr = (void *)NEXT_P_ENET; 144 145 return 1; 146 } 147 148 static void 149 findchannel_defer(device_t self) 150 { 151 struct xe_softc *xsc = device_private(self); 152 struct mb8795_softc *sc = &xsc->sc_mb8795; 153 int i, error; 154 155 if (!xsc->sc_txdma) { 156 xsc->sc_txdma = nextdma_findchannel ("enetx"); 157 if (xsc->sc_txdma == NULL) 158 panic("%s: can't find enetx DMA channel", 159 device_xname(sc->sc_dev)); 160 } 161 if (!xsc->sc_rxdma) { 162 xsc->sc_rxdma = nextdma_findchannel ("enetr"); 163 if (xsc->sc_rxdma == NULL) 164 panic ("%s: can't find enetr DMA channel", 165 device_xname(sc->sc_dev)); 166 } 167 aprint_normal_dev(sc->sc_dev, "using DMA channels %s %s\n", 168 device_xname(xsc->sc_txdma->sc_dev), 169 device_xname(xsc->sc_rxdma->sc_dev)); 170 171 nextdma_setconf (xsc->sc_rxdma, continue_cb, xe_dma_rx_continue); 172 nextdma_setconf (xsc->sc_rxdma, completed_cb, xe_dma_rx_completed); 173 nextdma_setconf (xsc->sc_rxdma, shutdown_cb, xe_dma_rx_shutdown); 174 nextdma_setconf (xsc->sc_rxdma, cb_arg, sc); 175 176 nextdma_setconf (xsc->sc_txdma, continue_cb, xe_dma_tx_continue); 177 nextdma_setconf (xsc->sc_txdma, completed_cb, xe_dma_tx_completed); 178 nextdma_setconf (xsc->sc_txdma, shutdown_cb, xe_dma_tx_shutdown); 179 nextdma_setconf (xsc->sc_txdma, cb_arg, sc); 180 181 /* Initialize the DMA maps */ 182 error = bus_dmamap_create(xsc->sc_txdma->sc_dmat, MCLBYTES, 183 (MCLBYTES/MSIZE), MCLBYTES, 0, BUS_DMA_ALLOCNOW, 184 &xsc->sc_tx_dmamap); 185 if (error) { 186 aprint_error_dev(sc->sc_dev, 187 "can't create tx DMA map, error = %d", error); 188 } 189 190 for(i = 0; i < MB8795_NRXBUFS; i++) { 191 error = bus_dmamap_create(xsc->sc_rxdma->sc_dmat, MCLBYTES, 192 (MCLBYTES/MSIZE), MCLBYTES, 0, BUS_DMA_ALLOCNOW, 193 &xsc->sc_rx_dmamap[i]); 194 if (error) { 195 panic("%s: can't create rx DMA map, error = %d", 196 device_xname(sc->sc_dev), error); 197 } 198 xsc->sc_rx_mb_head[i] = NULL; 199 } 200 xsc->sc_rx_loaded_idx = 0; 201 xsc->sc_rx_completed_idx = 0; 202 xsc->sc_rx_handled_idx = 0; 203 204 /* @@@ more next hacks 205 * the 2000 covers at least a 1500 mtu + headers 206 * + DMA_BEGINALIGNMENT+ DMA_ENDALIGNMENT 207 */ 208 xsc->sc_txbuf = malloc(2000, M_DEVBUF, M_WAITOK); 209 xsc->sc_tx_mb_head = NULL; 210 xsc->sc_tx_loaded = 0; 211 212 mb8795_config(sc, xe_dma_medias, nxe_dma_medias, xe_dma_medias[0]); 213 214 isrlink_autovec(xe_tint, sc, NEXT_I_IPL(NEXT_I_ENETX), 1, NULL); 215 INTR_ENABLE(NEXT_I_ENETX); 216 isrlink_autovec(xe_rint, sc, NEXT_I_IPL(NEXT_I_ENETR), 1, NULL); 217 INTR_ENABLE(NEXT_I_ENETR); 218 } 219 220 void 221 xe_attach(device_t parent, device_t self, void *aux) 222 { 223 struct intio_attach_args *ia = (struct intio_attach_args *)aux; 224 struct xe_softc *xsc = device_private(self); 225 struct mb8795_softc *sc = &xsc->sc_mb8795; 226 227 sc->sc_dev = self; 228 DPRINTF(("%s: xe_attach()\n", device_xname(self))); 229 230 { 231 /* kludge from machdep.c:next68k_bootargs() */ 232 extern u_char rom_enetaddr[6]; 233 int i; 234 235 for (i = 0; i < 6; i++) 236 sc->sc_enaddr[i] = rom_enetaddr[i]; 237 } 238 239 printf("\n%s: MAC address %02x:%02x:%02x:%02x:%02x:%02x\n", 240 device_xname(self), 241 sc->sc_enaddr[0],sc->sc_enaddr[1],sc->sc_enaddr[2], 242 sc->sc_enaddr[3],sc->sc_enaddr[4],sc->sc_enaddr[5]); 243 244 xsc->sc_bst = ia->ia_bst; 245 if (bus_space_map(xsc->sc_bst, NEXT_P_ENET, 246 XE_DEVICE_SIZE, 0, &xsc->sc_bsh)) { 247 panic("\n%s: can't map mb8795 registers", 248 device_xname(self)); 249 } 250 251 sc->sc_bmap_bst = ia->ia_bst; 252 if (bus_space_map(sc->sc_bmap_bst, NEXT_P_BMAP, 253 BMAP_SIZE, 0, &sc->sc_bmap_bsh)) 254 panic("\n%s: can't map bmap registers", device_xname(self)); 255 256 /* Set up glue for MI code. */ 257 sc->sc_glue = &xe_glue; 258 259 xsc->sc_txdma = nextdma_findchannel("enetx"); 260 xsc->sc_rxdma = nextdma_findchannel("enetr"); 261 if (xsc->sc_rxdma && xsc->sc_txdma) 262 findchannel_defer(self); 263 else 264 config_defer(self, findchannel_defer); 265 266 attached = 1; 267 } 268 269 int 270 xe_tint(void *arg) 271 { 272 if (!INTR_OCCURRED(NEXT_I_ENETX)) 273 return 0; 274 mb8795_tint((struct mb8795_softc *)arg); 275 return 1; 276 } 277 278 int 279 xe_rint(void *arg) 280 { 281 if (!INTR_OCCURRED(NEXT_I_ENETR)) 282 return 0; 283 mb8795_rint((struct mb8795_softc *)arg); 284 return 1; 285 } 286 287 /* 288 * Glue functions. 289 */ 290 291 u_char 292 xe_read_reg(struct mb8795_softc *sc, int reg) 293 { 294 struct xe_softc *xsc = (struct xe_softc *)sc; 295 296 return bus_space_read_1(xsc->sc_bst, xsc->sc_bsh, reg); 297 } 298 299 void 300 xe_write_reg(struct mb8795_softc *sc, int reg, u_char val) 301 { 302 struct xe_softc *xsc = (struct xe_softc *)sc; 303 304 bus_space_write_1(xsc->sc_bst, xsc->sc_bsh, reg, val); 305 } 306 307 void 308 xe_dma_reset(struct mb8795_softc *sc) 309 { 310 struct xe_softc *xsc = (struct xe_softc *)sc; 311 int i; 312 313 DPRINTF(("xe DMA reset\n")); 314 315 nextdma_reset(xsc->sc_rxdma); 316 nextdma_reset(xsc->sc_txdma); 317 318 if (xsc->sc_tx_loaded) { 319 bus_dmamap_sync(xsc->sc_txdma->sc_dmat, xsc->sc_tx_dmamap, 320 0, xsc->sc_tx_dmamap->dm_mapsize, BUS_DMASYNC_POSTWRITE); 321 bus_dmamap_unload(xsc->sc_txdma->sc_dmat, xsc->sc_tx_dmamap); 322 xsc->sc_tx_loaded = 0; 323 } 324 if (xsc->sc_tx_mb_head) { 325 m_freem(xsc->sc_tx_mb_head); 326 xsc->sc_tx_mb_head = NULL; 327 } 328 329 for(i = 0; i < MB8795_NRXBUFS; i++) { 330 if (xsc->sc_rx_mb_head[i]) { 331 bus_dmamap_unload(xsc->sc_rxdma->sc_dmat, 332 xsc->sc_rx_dmamap[i]); 333 m_freem(xsc->sc_rx_mb_head[i]); 334 xsc->sc_rx_mb_head[i] = NULL; 335 } 336 } 337 } 338 339 void 340 xe_dma_rx_setup(struct mb8795_softc *sc) 341 { 342 struct xe_softc *xsc = (struct xe_softc *)sc; 343 int i; 344 345 DPRINTF(("xe DMA rx setup\n")); 346 347 for(i = 0; i < MB8795_NRXBUFS; i++) 348 xsc->sc_rx_mb_head[i] = 349 xe_dma_rxmap_load(sc, xsc->sc_rx_dmamap[i]); 350 351 xsc->sc_rx_loaded_idx = 0; 352 xsc->sc_rx_completed_idx = 0; 353 xsc->sc_rx_handled_idx = 0; 354 355 nextdma_init(xsc->sc_rxdma); 356 } 357 358 void 359 xe_dma_rx_go(struct mb8795_softc *sc) 360 { 361 struct xe_softc *xsc = (struct xe_softc *)sc; 362 363 DPRINTF(("xe DMA rx go\n")); 364 365 nextdma_start(xsc->sc_rxdma, DMACSR_SETREAD); 366 } 367 368 struct mbuf * 369 xe_dma_rx_mbuf(struct mb8795_softc *sc) 370 { 371 struct xe_softc *xsc = (struct xe_softc *)sc; 372 bus_dmamap_t map; 373 struct mbuf *m; 374 375 m = NULL; 376 if (xsc->sc_rx_handled_idx != xsc->sc_rx_completed_idx) { 377 xsc->sc_rx_handled_idx++; 378 xsc->sc_rx_handled_idx %= MB8795_NRXBUFS; 379 380 map = xsc->sc_rx_dmamap[xsc->sc_rx_handled_idx]; 381 m = xsc->sc_rx_mb_head[xsc->sc_rx_handled_idx]; 382 383 m->m_len = map->dm_xfer_len; 384 385 bus_dmamap_sync(xsc->sc_rxdma->sc_dmat, map, 386 0, map->dm_mapsize, BUS_DMASYNC_POSTREAD); 387 388 bus_dmamap_unload(xsc->sc_rxdma->sc_dmat, map); 389 390 /* Install a fresh mbuf for next packet */ 391 392 xsc->sc_rx_mb_head[xsc->sc_rx_handled_idx] = 393 xe_dma_rxmap_load(sc,map); 394 395 /* Punt runt packets 396 * DMA restarts create 0 length packets for example 397 */ 398 if (m->m_len < ETHER_MIN_LEN) { 399 m_freem(m); 400 m = NULL; 401 } 402 } 403 return m; 404 } 405 406 void 407 xe_dma_tx_setup(struct mb8795_softc *sc) 408 { 409 struct xe_softc *xsc = (struct xe_softc *)sc; 410 411 DPRINTF(("xe DMA tx setup\n")); 412 413 nextdma_init(xsc->sc_txdma); 414 } 415 416 void 417 xe_dma_tx_go(struct mb8795_softc *sc) 418 { 419 struct xe_softc *xsc = (struct xe_softc *)sc; 420 421 DPRINTF(("xe DMA tx go\n")); 422 423 nextdma_start(xsc->sc_txdma, DMACSR_SETWRITE); 424 } 425 426 int 427 xe_dma_tx_mbuf(struct mb8795_softc *sc, struct mbuf *m) 428 { 429 struct xe_softc *xsc = (struct xe_softc *)sc; 430 int error; 431 432 xsc->sc_tx_mb_head = m; 433 434 /* The following is a next specific hack that should 435 * probably be moved out of MI code. 436 * This macro assumes it can move forward as needed 437 * in the buffer. Perhaps it should zero the extra buffer. 438 */ 439 #define REALIGN_DMABUF(s,l) \ 440 { (s) = ((u_char *)(((unsigned)(s)+DMA_BEGINALIGNMENT-1) \ 441 &~(DMA_BEGINALIGNMENT-1))); \ 442 (l) = ((u_char *)(((unsigned)((s)+(l))+DMA_ENDALIGNMENT-1) \ 443 &~(DMA_ENDALIGNMENT-1)))-(s);} 444 445 #if 0 446 error = bus_dmamap_load_mbuf(xsc->sc_txdma->sc_dmat, 447 xsc->sc_tx_dmamap, xsc->sc_tx_mb_head, BUS_DMA_NOWAIT); 448 #else 449 { 450 u_char *buf = xsc->sc_txbuf; 451 int buflen = 0; 452 453 buflen = m->m_pkthdr.len; 454 455 { 456 u_char *p = buf; 457 for (m=xsc->sc_tx_mb_head; m; m = m->m_next) { 458 if (m->m_len == 0) continue; 459 memcpy(p, mtod(m, u_char *), m->m_len); 460 p += m->m_len; 461 } 462 /* Fix runt packets */ 463 if (buflen < ETHER_MIN_LEN - ETHER_CRC_LEN) { 464 memset(p, 0, 465 ETHER_MIN_LEN - ETHER_CRC_LEN - buflen); 466 buflen = ETHER_MIN_LEN - ETHER_CRC_LEN; 467 } 468 } 469 470 error = bus_dmamap_load(xsc->sc_txdma->sc_dmat, 471 xsc->sc_tx_dmamap, buf, buflen, NULL, BUS_DMA_NOWAIT); 472 } 473 #endif 474 if (error) { 475 aprint_error_dev(sc->sc_dev, 476 "can't load mbuf chain, error = %d\n", error); 477 m_freem(xsc->sc_tx_mb_head); 478 xsc->sc_tx_mb_head = NULL; 479 return error; 480 } 481 482 #ifdef DIAGNOSTIC 483 if (xsc->sc_tx_loaded != 0) { 484 panic("%s: xsc->sc_tx_loaded is %d", device_xname(sc->sc_dev), 485 xsc->sc_tx_loaded); 486 } 487 #endif 488 489 bus_dmamap_sync(xsc->sc_txdma->sc_dmat, xsc->sc_tx_dmamap, 0, 490 xsc->sc_tx_dmamap->dm_mapsize, BUS_DMASYNC_PREWRITE); 491 492 return 0; 493 } 494 495 int 496 xe_dma_tx_isactive(struct mb8795_softc *sc) 497 { 498 struct xe_softc *xsc = (struct xe_softc *)sc; 499 500 return (xsc->sc_tx_loaded != 0); 501 } 502 503 /****************************************************************/ 504 505 void 506 xe_dma_tx_completed(bus_dmamap_t map, void *arg) 507 { 508 #if defined (XE_DEBUG) || defined (DIAGNOSTIC) 509 struct mb8795_softc *sc = arg; 510 #endif 511 #ifdef DIAGNOSTIC 512 struct xe_softc *xsc = (struct xe_softc *)sc; 513 #endif 514 515 DPRINTF(("%s: xe_dma_tx_completed()\n", device_xname(sc->sc_dev))); 516 517 #ifdef DIAGNOSTIC 518 if (!xsc->sc_tx_loaded) 519 panic("%s: tx completed never loaded", 520 device_xname(sc->sc_dev)); 521 522 if (map != xsc->sc_tx_dmamap) 523 panic("%s: unexpected tx completed map", 524 device_xname(sc->sc_dev)); 525 526 #endif 527 } 528 529 void 530 xe_dma_tx_shutdown(void *arg) 531 { 532 struct mb8795_softc *sc = arg; 533 struct xe_softc *xsc = (struct xe_softc *)sc; 534 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 535 536 DPRINTF(("%s: xe_dma_tx_shutdown()\n", device_xname(sc->sc_dev))); 537 538 #ifdef DIAGNOSTIC 539 if (!xsc->sc_tx_loaded) 540 panic("%s: tx shutdown never loaded", 541 device_xname(sc->sc_dev)); 542 #endif 543 544 if (turbo) 545 MB_WRITE_REG(sc, MB8795_TXMODE, MB8795_TXMODE_TURBO1); 546 if (xsc->sc_tx_loaded) { 547 bus_dmamap_sync(xsc->sc_txdma->sc_dmat, xsc->sc_tx_dmamap, 548 0, xsc->sc_tx_dmamap->dm_mapsize, BUS_DMASYNC_POSTWRITE); 549 bus_dmamap_unload(xsc->sc_txdma->sc_dmat, xsc->sc_tx_dmamap); 550 m_freem(xsc->sc_tx_mb_head); 551 xsc->sc_tx_mb_head = NULL; 552 553 xsc->sc_tx_loaded--; 554 } 555 556 #ifdef DIAGNOSTIC 557 if (xsc->sc_tx_loaded != 0) 558 panic("%s: sc->sc_tx_loaded is %d", device_xname(sc->sc_dev), 559 xsc->sc_tx_loaded); 560 #endif 561 562 ifp->if_timer = 0; 563 564 #if 1 565 if ((ifp->if_flags & IFF_RUNNING) && !IF_IS_EMPTY(&sc->sc_tx_snd)) { 566 void mb8795_start_dma(struct mb8795_softc *); /* XXXX */ 567 mb8795_start_dma(sc); 568 } 569 #endif 570 571 #if 0 572 /* Enable ready interrupt */ 573 MB_WRITE_REG(sc, MB8795_TXMASK, 574 MB_READ_REG(sc, MB8795_TXMASK) 575 | MB8795_TXMASK_TXRXIE/* READYIE */); 576 #endif 577 } 578 579 580 void 581 xe_dma_rx_completed(bus_dmamap_t map, void *arg) 582 { 583 struct mb8795_softc *sc = arg; 584 struct xe_softc *xsc = (struct xe_softc *)sc; 585 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 586 587 if (ifp->if_flags & IFF_RUNNING) { 588 xsc->sc_rx_completed_idx++; 589 xsc->sc_rx_completed_idx %= MB8795_NRXBUFS; 590 591 DPRINTF(("%s: xe_dma_rx_completed(), " 592 "sc->sc_rx_completed_idx = %d\n", 593 device_xname(sc->sc_dev), xsc->sc_rx_completed_idx)); 594 595 #if (defined(DIAGNOSTIC)) 596 if (map != xsc->sc_rx_dmamap[xsc->sc_rx_completed_idx]) 597 panic("%s: Unexpected rx dmamap completed", 598 device_xname(sc->sc_dev)); 599 #endif 600 } 601 #ifdef DIAGNOSTIC 602 else 603 DPRINTF(("%s: Unexpected rx dmamap completed while if not " 604 "running\n", device_xname(sc->sc_dev))); 605 #endif 606 } 607 608 void 609 xe_dma_rx_shutdown(void *arg) 610 { 611 struct mb8795_softc *sc = arg; 612 struct xe_softc *xsc = (struct xe_softc *)sc; 613 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 614 615 if (ifp->if_flags & IFF_RUNNING) { 616 DPRINTF(("%s: xe_dma_rx_shutdown(), restarting.\n", 617 device_xname(sc->sc_dev))); 618 619 nextdma_start(xsc->sc_rxdma, DMACSR_SETREAD); 620 if (turbo) 621 MB_WRITE_REG(sc, MB8795_RXMODE, 622 MB8795_RXMODE_TEST | MB8795_RXMODE_MULTICAST); 623 } 624 #ifdef DIAGNOSTIC 625 else 626 DPRINTF(("%s: Unexpected rx DMA shutdown while if not " 627 "running\n", device_xname(sc->sc_dev))); 628 #endif 629 } 630 631 /* 632 * load a dmamap with a freshly allocated mbuf 633 */ 634 struct mbuf * 635 xe_dma_rxmap_load(struct mb8795_softc *sc, bus_dmamap_t map) 636 { 637 struct xe_softc *xsc = (struct xe_softc *)sc; 638 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 639 struct mbuf *m; 640 int error; 641 642 MGETHDR(m, M_DONTWAIT, MT_DATA); 643 if (m) { 644 MCLGET(m, M_DONTWAIT); 645 if ((m->m_flags & M_EXT) == 0) { 646 m_freem(m); 647 m = NULL; 648 } else 649 m->m_len = MCLBYTES; 650 } 651 if (!m) { 652 /* 653 * @@@ Handle this gracefully by reusing a scratch buffer 654 * or something. 655 */ 656 panic("Unable to get memory for incoming ethernet"); 657 } 658 659 /* 660 * Align buffer, @@@ next specific. 661 * perhaps should be using M_ALIGN here instead? 662 * First we give us a little room to align with. 663 */ 664 { 665 u_char *buf = m->m_data; 666 int buflen = m->m_len; 667 buflen -= DMA_ENDALIGNMENT+DMA_BEGINALIGNMENT; 668 REALIGN_DMABUF(buf, buflen); 669 m->m_data = buf; 670 m->m_len = buflen; 671 } 672 673 m_set_rcvif(m, ifp); 674 m->m_pkthdr.len = m->m_len; 675 676 error = bus_dmamap_load_mbuf(xsc->sc_rxdma->sc_dmat, 677 map, m, BUS_DMA_NOWAIT); 678 679 bus_dmamap_sync(xsc->sc_rxdma->sc_dmat, map, 0, 680 map->dm_mapsize, BUS_DMASYNC_PREREAD); 681 682 if (error) { 683 DPRINTF(("DEBUG: m->m_data = %p, m->m_len = %d\n", 684 m->m_data, m->m_len)); 685 DPRINTF(("DEBUG: MCLBYTES = %d, map->_dm_size = %ld\n", 686 MCLBYTES, map->_dm_size)); 687 688 panic("%s: can't load rx mbuf chain, error = %d", 689 device_xname(sc->sc_dev), error); 690 m_freem(m); 691 m = NULL; 692 } 693 694 return m; 695 } 696 697 bus_dmamap_t 698 xe_dma_rx_continue(void *arg) 699 { 700 struct mb8795_softc *sc = arg; 701 struct xe_softc *xsc = (struct xe_softc *)sc; 702 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 703 bus_dmamap_t map = NULL; 704 705 if (ifp->if_flags & IFF_RUNNING) { 706 if (((xsc->sc_rx_loaded_idx+1)%MB8795_NRXBUFS) 707 == xsc->sc_rx_handled_idx) { 708 /* Make space for one packet by dropping one */ 709 struct mbuf *m; 710 m = xe_dma_rx_mbuf (sc); 711 if (m) 712 m_freem(m); 713 #if (defined(DIAGNOSTIC)) 714 DPRINTF(("%s: out of receive DMA buffers\n", 715 device_xname(sc->sc_dev))); 716 #endif 717 } 718 xsc->sc_rx_loaded_idx++; 719 xsc->sc_rx_loaded_idx %= MB8795_NRXBUFS; 720 map = xsc->sc_rx_dmamap[xsc->sc_rx_loaded_idx]; 721 722 DPRINTF(("%s: xe_dma_rx_continue() xsc->sc_rx_loaded_idx " 723 "= %d\n", device_xname(sc->sc_dev), 724 xsc->sc_rx_loaded_idx)); 725 } 726 #ifdef DIAGNOSTIC 727 else 728 panic("%s: Unexpected rx DMA continue while if not running", 729 device_xname(sc->sc_dev)); 730 #endif 731 732 return map; 733 } 734 735 bus_dmamap_t 736 xe_dma_tx_continue(void *arg) 737 { 738 struct mb8795_softc *sc = arg; 739 struct xe_softc *xsc = (struct xe_softc *)sc; 740 bus_dmamap_t map; 741 742 DPRINTF(("%s: xe_dma_tx_continue()\n", device_xname(sc->sc_dev))); 743 744 if (xsc->sc_tx_loaded) 745 map = NULL; 746 else { 747 map = xsc->sc_tx_dmamap; 748 xsc->sc_tx_loaded++; 749 } 750 751 #ifdef DIAGNOSTIC 752 if (xsc->sc_tx_loaded != 1) 753 panic("%s: sc->sc_tx_loaded is %d", device_xname(sc->sc_dev), 754 xsc->sc_tx_loaded); 755 #endif 756 757 return map; 758 } 759
Indexes created Thu Oct 02 01:09:59 GMT 2025