1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for the Macintosh 68K onboard MACE controller with PSC 4 * driven DMA. The MACE driver code is derived from mace.c. The 5 * Mac68k theory of operation is courtesy of the MacBSD wizards. 6 * 7 * Copyright (C) 1996 Paul Mackerras. 8 * Copyright (C) 1998 Alan Cox <alan@lxorguk.ukuu.org.uk> 9 * 10 * Modified heavily by Joshua M. Thompson based on Dave Huang's NetBSD driver 11 * 12 * Copyright (C) 2007 Finn Thain 13 * 14 * Converted to DMA API, converted to unified driver model, 15 * sync'd some routines with mace.c and fixed various bugs. 16 */ 17 18 19 #include <linux/kernel.h> 20 #include <linux/module.h> 21 #include <linux/netdevice.h> 22 #include <linux/etherdevice.h> 23 #include <linux/delay.h> 24 #include <linux/string.h> 25 #include <linux/crc32.h> 26 #include <linux/bitrev.h> 27 #include <linux/dma-mapping.h> 28 #include <linux/platform_device.h> 29 #include <linux/gfp.h> 30 #include <linux/interrupt.h> 31 #include <asm/io.h> 32 #include <asm/macints.h> 33 #include <asm/mac_psc.h> 34 #include <asm/page.h> 35 #include "mace.h" 36 37 static char mac_mace_string[] = "macmace"; 38 39 #define N_TX_BUFF_ORDER 0 40 #define N_TX_RING (1 << N_TX_BUFF_ORDER) 41 #define N_RX_BUFF_ORDER 3 42 #define N_RX_RING (1 << N_RX_BUFF_ORDER) 43 44 #define TX_TIMEOUT HZ 45 46 #define MACE_BUFF_SIZE 0x800 47 48 /* Chip rev needs workaround on HW & multicast addr change */ 49 #define BROKEN_ADDRCHG_REV 0x0941 50 51 /* The MACE is simply wired down on a Mac68K box */ 52 53 #define MACE_BASE (void *)(0x50F1C000) 54 #define MACE_PROM (void *)(0x50F08001) 55 56 struct mace_data { 57 volatile struct mace *mace; 58 unsigned char *tx_ring; 59 dma_addr_t tx_ring_phys; 60 unsigned char *rx_ring; 61 dma_addr_t rx_ring_phys; 62 int dma_intr; 63 int rx_slot, rx_tail; 64 int tx_slot, tx_sloti, tx_count; 65 int chipid; 66 struct device *device; 67 }; 68 69 struct mace_frame { 70 u8 rcvcnt; 71 u8 pad1; 72 u8 rcvsts; 73 u8 pad2; 74 u8 rntpc; 75 u8 pad3; 76 u8 rcvcc; 77 u8 pad4; 78 u32 pad5; 79 u32 pad6; 80 u8 data[1]; 81 /* And frame continues.. */ 82 }; 83 84 #define PRIV_BYTES sizeof(struct mace_data) 85 86 static int mace_open(struct net_device *dev); 87 static int mace_close(struct net_device *dev); 88 static netdev_tx_t mace_xmit_start(struct sk_buff *skb, struct net_device *dev); 89 static void mace_set_multicast(struct net_device *dev); 90 static int mace_set_address(struct net_device *dev, void *addr); 91 static void mace_reset(struct net_device *dev); 92 static irqreturn_t mace_interrupt(int irq, void *dev_id); 93 static irqreturn_t mace_dma_intr(int irq, void *dev_id); 94 static void mace_tx_timeout(struct net_device *dev, unsigned int txqueue); 95 static void __mace_set_address(struct net_device *dev, const void *addr); 96 97 /* 98 * Load a receive DMA channel with a base address and ring length 99 */ 100 101 static void mace_load_rxdma_base(struct net_device *dev, int set) 102 { 103 struct mace_data *mp = netdev_priv(dev); 104 105 psc_write_word(PSC_ENETRD_CMD + set, 0x0100); 106 psc_write_long(PSC_ENETRD_ADDR + set, (u32) mp->rx_ring_phys); 107 psc_write_long(PSC_ENETRD_LEN + set, N_RX_RING); 108 psc_write_word(PSC_ENETRD_CMD + set, 0x9800); 109 mp->rx_tail = 0; 110 } 111 112 /* 113 * Reset the receive DMA subsystem 114 */ 115 116 static void mace_rxdma_reset(struct net_device *dev) 117 { 118 struct mace_data *mp = netdev_priv(dev); 119 volatile struct mace *mace = mp->mace; 120 u8 maccc = mace->maccc; 121 122 mace->maccc = maccc & ~ENRCV; 123 124 psc_write_word(PSC_ENETRD_CTL, 0x8800); 125 mace_load_rxdma_base(dev, 0x00); 126 psc_write_word(PSC_ENETRD_CTL, 0x0400); 127 128 psc_write_word(PSC_ENETRD_CTL, 0x8800); 129 mace_load_rxdma_base(dev, 0x10); 130 psc_write_word(PSC_ENETRD_CTL, 0x0400); 131 132 mace->maccc = maccc; 133 mp->rx_slot = 0; 134 135 psc_write_word(PSC_ENETRD_CMD + PSC_SET0, 0x9800); 136 psc_write_word(PSC_ENETRD_CMD + PSC_SET1, 0x9800); 137 } 138 139 /* 140 * Reset the transmit DMA subsystem 141 */ 142 143 static void mace_txdma_reset(struct net_device *dev) 144 { 145 struct mace_data *mp = netdev_priv(dev); 146 volatile struct mace *mace = mp->mace; 147 u8 maccc; 148 149 psc_write_word(PSC_ENETWR_CTL, 0x8800); 150 151 maccc = mace->maccc; 152 mace->maccc = maccc & ~ENXMT; 153 154 mp->tx_slot = mp->tx_sloti = 0; 155 mp->tx_count = N_TX_RING; 156 157 psc_write_word(PSC_ENETWR_CTL, 0x0400); 158 mace->maccc = maccc; 159 } 160 161 /* 162 * Disable DMA 163 */ 164 165 static void mace_dma_off(struct net_device *dev) 166 { 167 psc_write_word(PSC_ENETRD_CTL, 0x8800); 168 psc_write_word(PSC_ENETRD_CTL, 0x1000); 169 psc_write_word(PSC_ENETRD_CMD + PSC_SET0, 0x1100); 170 psc_write_word(PSC_ENETRD_CMD + PSC_SET1, 0x1100); 171 172 psc_write_word(PSC_ENETWR_CTL, 0x8800); 173 psc_write_word(PSC_ENETWR_CTL, 0x1000); 174 psc_write_word(PSC_ENETWR_CMD + PSC_SET0, 0x1100); 175 psc_write_word(PSC_ENETWR_CMD + PSC_SET1, 0x1100); 176 } 177 178 static const struct net_device_ops mace_netdev_ops = { 179 .ndo_open = mace_open, 180 .ndo_stop = mace_close, 181 .ndo_start_xmit = mace_xmit_start, 182 .ndo_tx_timeout = mace_tx_timeout, 183 .ndo_set_rx_mode = mace_set_multicast, 184 .ndo_set_mac_address = mace_set_address, 185 .ndo_validate_addr = eth_validate_addr, 186 }; 187 188 /* 189 * Not really much of a probe. The hardware table tells us if this 190 * model of Macintrash has a MACE (AV macintoshes) 191 */ 192 193 static int mace_probe(struct platform_device *pdev) 194 { 195 int j; 196 struct mace_data *mp; 197 unsigned char *addr; 198 struct net_device *dev; 199 unsigned char checksum = 0; 200 u8 macaddr[ETH_ALEN]; 201 int err; 202 203 dev = alloc_etherdev(PRIV_BYTES); 204 if (!dev) 205 return -ENOMEM; 206 207 mp = netdev_priv(dev); 208 209 mp->device = &pdev->dev; 210 platform_set_drvdata(pdev, dev); 211 SET_NETDEV_DEV(dev, &pdev->dev); 212 213 dev->base_addr = (u32)MACE_BASE; 214 mp->mace = MACE_BASE; 215 216 dev->irq = IRQ_MAC_MACE; 217 mp->dma_intr = IRQ_MAC_MACE_DMA; 218 219 mp->chipid = mp->mace->chipid_hi << 8 | mp->mace->chipid_lo; 220 221 /* 222 * The PROM contains 8 bytes which total 0xFF when XOR'd 223 * together. Due to the usual peculiar apple brain damage 224 * the bytes are spaced out in a strange boundary and the 225 * bits are reversed. 226 */ 227 228 addr = MACE_PROM; 229 230 for (j = 0; j < 6; ++j) { 231 u8 v = bitrev8(addr[j<<4]); 232 checksum ^= v; 233 macaddr[j] = v; 234 } 235 eth_hw_addr_set(dev, macaddr); 236 for (; j < 8; ++j) { 237 checksum ^= bitrev8(addr[j<<4]); 238 } 239 240 if (checksum != 0xFF) { 241 free_netdev(dev); 242 return -ENODEV; 243 } 244 245 dev->netdev_ops = &mace_netdev_ops; 246 dev->watchdog_timeo = TX_TIMEOUT; 247 248 pr_info("Onboard MACE, hardware address %pM, chip revision 0x%04X\n", 249 dev->dev_addr, mp->chipid); 250 251 err = register_netdev(dev); 252 if (!err) 253 return 0; 254 255 free_netdev(dev); 256 return err; 257 } 258 259 /* 260 * Reset the chip. 261 */ 262 263 static void mace_reset(struct net_device *dev) 264 { 265 struct mace_data *mp = netdev_priv(dev); 266 volatile struct mace *mb = mp->mace; 267 int i; 268 269 /* soft-reset the chip */ 270 i = 200; 271 while (--i) { 272 mb->biucc = SWRST; 273 if (mb->biucc & SWRST) { 274 udelay(10); 275 continue; 276 } 277 break; 278 } 279 if (!i) { 280 printk(KERN_ERR "macmace: cannot reset chip!\n"); 281 return; 282 } 283 284 mb->maccc = 0; /* turn off tx, rx */ 285 mb->imr = 0xFF; /* disable all intrs for now */ 286 i = mb->ir; 287 288 mb->biucc = XMTSP_64; 289 mb->utr = RTRD; 290 mb->fifocc = XMTFW_8 | RCVFW_64 | XMTFWU | RCVFWU; 291 292 mb->xmtfc = AUTO_PAD_XMIT; /* auto-pad short frames */ 293 mb->rcvfc = 0; 294 295 /* load up the hardware address */ 296 __mace_set_address(dev, dev->dev_addr); 297 298 /* clear the multicast filter */ 299 if (mp->chipid == BROKEN_ADDRCHG_REV) 300 mb->iac = LOGADDR; 301 else { 302 mb->iac = ADDRCHG | LOGADDR; 303 while ((mb->iac & ADDRCHG) != 0) 304 ; 305 } 306 for (i = 0; i < 8; ++i) 307 mb->ladrf = 0; 308 309 /* done changing address */ 310 if (mp->chipid != BROKEN_ADDRCHG_REV) 311 mb->iac = 0; 312 313 mb->plscc = PORTSEL_AUI; 314 } 315 316 /* 317 * Load the address on a mace controller. 318 */ 319 320 static void __mace_set_address(struct net_device *dev, const void *addr) 321 { 322 struct mace_data *mp = netdev_priv(dev); 323 volatile struct mace *mb = mp->mace; 324 const unsigned char *p = addr; 325 u8 macaddr[ETH_ALEN]; 326 int i; 327 328 /* load up the hardware address */ 329 if (mp->chipid == BROKEN_ADDRCHG_REV) 330 mb->iac = PHYADDR; 331 else { 332 mb->iac = ADDRCHG | PHYADDR; 333 while ((mb->iac & ADDRCHG) != 0) 334 ; 335 } 336 for (i = 0; i < 6; ++i) 337 mb->padr = macaddr[i] = p[i]; 338 eth_hw_addr_set(dev, macaddr); 339 if (mp->chipid != BROKEN_ADDRCHG_REV) 340 mb->iac = 0; 341 } 342 343 static int mace_set_address(struct net_device *dev, void *addr) 344 { 345 struct mace_data *mp = netdev_priv(dev); 346 volatile struct mace *mb = mp->mace; 347 unsigned long flags; 348 u8 maccc; 349 350 local_irq_save(flags); 351 352 maccc = mb->maccc; 353 354 __mace_set_address(dev, addr); 355 356 mb->maccc = maccc; 357 358 local_irq_restore(flags); 359 360 return 0; 361 } 362 363 /* 364 * Open the Macintosh MACE. Most of this is playing with the DMA 365 * engine. The ethernet chip is quite friendly. 366 */ 367 368 static int mace_open(struct net_device *dev) 369 { 370 struct mace_data *mp = netdev_priv(dev); 371 volatile struct mace *mb = mp->mace; 372 373 /* reset the chip */ 374 mace_reset(dev); 375 376 if (request_irq(dev->irq, mace_interrupt, 0, dev->name, dev)) { 377 printk(KERN_ERR "%s: can't get irq %d\n", dev->name, dev->irq); 378 return -EAGAIN; 379 } 380 if (request_irq(mp->dma_intr, mace_dma_intr, 0, dev->name, dev)) { 381 printk(KERN_ERR "%s: can't get irq %d\n", dev->name, mp->dma_intr); 382 free_irq(dev->irq, dev); 383 return -EAGAIN; 384 } 385 386 /* Allocate the DMA ring buffers */ 387 388 mp->tx_ring = dma_alloc_coherent(mp->device, 389 N_TX_RING * MACE_BUFF_SIZE, 390 &mp->tx_ring_phys, GFP_KERNEL); 391 if (mp->tx_ring == NULL) 392 goto out1; 393 394 mp->rx_ring = dma_alloc_coherent(mp->device, 395 N_RX_RING * MACE_BUFF_SIZE, 396 &mp->rx_ring_phys, GFP_KERNEL); 397 if (mp->rx_ring == NULL) 398 goto out2; 399 400 mace_dma_off(dev); 401 402 /* Not sure what these do */ 403 404 psc_write_word(PSC_ENETWR_CTL, 0x9000); 405 psc_write_word(PSC_ENETRD_CTL, 0x9000); 406 psc_write_word(PSC_ENETWR_CTL, 0x0400); 407 psc_write_word(PSC_ENETRD_CTL, 0x0400); 408 409 mace_rxdma_reset(dev); 410 mace_txdma_reset(dev); 411 412 /* turn it on! */ 413 mb->maccc = ENXMT | ENRCV; 414 /* enable all interrupts except receive interrupts */ 415 mb->imr = RCVINT; 416 return 0; 417 418 out2: 419 dma_free_coherent(mp->device, N_TX_RING * MACE_BUFF_SIZE, 420 mp->tx_ring, mp->tx_ring_phys); 421 out1: 422 free_irq(dev->irq, dev); 423 free_irq(mp->dma_intr, dev); 424 return -ENOMEM; 425 } 426 427 /* 428 * Shut down the mace and its interrupt channel 429 */ 430 431 static int mace_close(struct net_device *dev) 432 { 433 struct mace_data *mp = netdev_priv(dev); 434 volatile struct mace *mb = mp->mace; 435 436 mb->maccc = 0; /* disable rx and tx */ 437 mb->imr = 0xFF; /* disable all irqs */ 438 mace_dma_off(dev); /* disable rx and tx dma */ 439 440 return 0; 441 } 442 443 /* 444 * Transmit a frame 445 */ 446 447 static netdev_tx_t mace_xmit_start(struct sk_buff *skb, struct net_device *dev) 448 { 449 struct mace_data *mp = netdev_priv(dev); 450 unsigned long flags; 451 452 /* Stop the queue since there's only the one buffer */ 453 454 local_irq_save(flags); 455 netif_stop_queue(dev); 456 if (!mp->tx_count) { 457 printk(KERN_ERR "macmace: tx queue running but no free buffers.\n"); 458 local_irq_restore(flags); 459 return NETDEV_TX_BUSY; 460 } 461 mp->tx_count--; 462 local_irq_restore(flags); 463 464 dev->stats.tx_packets++; 465 dev->stats.tx_bytes += skb->len; 466 467 /* We need to copy into our xmit buffer to take care of alignment and caching issues */ 468 skb_copy_from_linear_data(skb, mp->tx_ring, skb->len); 469 470 /* load the Tx DMA and fire it off */ 471 472 psc_write_long(PSC_ENETWR_ADDR + mp->tx_slot, (u32) mp->tx_ring_phys); 473 psc_write_long(PSC_ENETWR_LEN + mp->tx_slot, skb->len); 474 psc_write_word(PSC_ENETWR_CMD + mp->tx_slot, 0x9800); 475 476 mp->tx_slot ^= 0x10; 477 478 dev_kfree_skb(skb); 479 480 return NETDEV_TX_OK; 481 } 482 483 static void mace_set_multicast(struct net_device *dev) 484 { 485 struct mace_data *mp = netdev_priv(dev); 486 volatile struct mace *mb = mp->mace; 487 int i; 488 u32 crc; 489 u8 maccc; 490 unsigned long flags; 491 492 local_irq_save(flags); 493 maccc = mb->maccc; 494 mb->maccc &= ~PROM; 495 496 if (dev->flags & IFF_PROMISC) { 497 mb->maccc |= PROM; 498 } else { 499 unsigned char multicast_filter[8]; 500 struct netdev_hw_addr *ha; 501 502 if (dev->flags & IFF_ALLMULTI) { 503 for (i = 0; i < 8; i++) { 504 multicast_filter[i] = 0xFF; 505 } 506 } else { 507 for (i = 0; i < 8; i++) 508 multicast_filter[i] = 0; 509 netdev_for_each_mc_addr(ha, dev) { 510 crc = ether_crc_le(6, ha->addr); 511 /* bit number in multicast_filter */ 512 i = crc >> 26; 513 multicast_filter[i >> 3] |= 1 << (i & 7); 514 } 515 } 516 517 if (mp->chipid == BROKEN_ADDRCHG_REV) 518 mb->iac = LOGADDR; 519 else { 520 mb->iac = ADDRCHG | LOGADDR; 521 while ((mb->iac & ADDRCHG) != 0) 522 ; 523 } 524 for (i = 0; i < 8; ++i) 525 mb->ladrf = multicast_filter[i]; 526 if (mp->chipid != BROKEN_ADDRCHG_REV) 527 mb->iac = 0; 528 } 529 530 mb->maccc = maccc; 531 local_irq_restore(flags); 532 } 533 534 static void mace_handle_misc_intrs(struct net_device *dev, int intr) 535 { 536 struct mace_data *mp = netdev_priv(dev); 537 volatile struct mace *mb = mp->mace; 538 static int mace_babbles, mace_jabbers; 539 540 if (intr & MPCO) 541 dev->stats.rx_missed_errors += 256; 542 dev->stats.rx_missed_errors += mb->mpc; /* reading clears it */ 543 if (intr & RNTPCO) 544 dev->stats.rx_length_errors += 256; 545 dev->stats.rx_length_errors += mb->rntpc; /* reading clears it */ 546 if (intr & CERR) 547 ++dev->stats.tx_heartbeat_errors; 548 if (intr & BABBLE) 549 if (mace_babbles++ < 4) 550 printk(KERN_DEBUG "macmace: babbling transmitter\n"); 551 if (intr & JABBER) 552 if (mace_jabbers++ < 4) 553 printk(KERN_DEBUG "macmace: jabbering transceiver\n"); 554 } 555 556 static irqreturn_t mace_interrupt(int irq, void *dev_id) 557 { 558 struct net_device *dev = (struct net_device *) dev_id; 559 struct mace_data *mp = netdev_priv(dev); 560 volatile struct mace *mb = mp->mace; 561 int intr, fs; 562 unsigned long flags; 563 564 /* don't want the dma interrupt handler to fire */ 565 local_irq_save(flags); 566 567 intr = mb->ir; /* read interrupt register */ 568 mace_handle_misc_intrs(dev, intr); 569 570 if (intr & XMTINT) { 571 fs = mb->xmtfs; 572 if ((fs & XMTSV) == 0) { 573 printk(KERN_ERR "macmace: xmtfs not valid! (fs=%x)\n", fs); 574 mace_reset(dev); 575 /* 576 * XXX mace likes to hang the machine after a xmtfs error. 577 * This is hard to reproduce, resetting *may* help 578 */ 579 } 580 /* dma should have finished */ 581 if (!mp->tx_count) { 582 printk(KERN_DEBUG "macmace: tx ring ran out? (fs=%x)\n", fs); 583 } 584 /* Update stats */ 585 if (fs & (UFLO|LCOL|LCAR|RTRY)) { 586 ++dev->stats.tx_errors; 587 if (fs & LCAR) 588 ++dev->stats.tx_carrier_errors; 589 else if (fs & (UFLO|LCOL|RTRY)) { 590 ++dev->stats.tx_aborted_errors; 591 if (mb->xmtfs & UFLO) { 592 dev->stats.tx_fifo_errors++; 593 mace_txdma_reset(dev); 594 } 595 } 596 } 597 } 598 599 if (mp->tx_count) 600 netif_wake_queue(dev); 601 602 local_irq_restore(flags); 603 604 return IRQ_HANDLED; 605 } 606 607 static void mace_tx_timeout(struct net_device *dev, unsigned int txqueue) 608 { 609 struct mace_data *mp = netdev_priv(dev); 610 volatile struct mace *mb = mp->mace; 611 unsigned long flags; 612 613 local_irq_save(flags); 614 615 /* turn off both tx and rx and reset the chip */ 616 mb->maccc = 0; 617 printk(KERN_ERR "macmace: transmit timeout - resetting\n"); 618 mace_txdma_reset(dev); 619 mace_reset(dev); 620 621 /* restart rx dma */ 622 mace_rxdma_reset(dev); 623 624 mp->tx_count = N_TX_RING; 625 netif_wake_queue(dev); 626 627 /* turn it on! */ 628 mb->maccc = ENXMT | ENRCV; 629 /* enable all interrupts except receive interrupts */ 630 mb->imr = RCVINT; 631 632 local_irq_restore(flags); 633 } 634 635 /* 636 * Handle a newly arrived frame 637 */ 638 639 static void mace_dma_rx_frame(struct net_device *dev, struct mace_frame *mf) 640 { 641 struct sk_buff *skb; 642 unsigned int frame_status = mf->rcvsts; 643 644 if (frame_status & (RS_OFLO | RS_CLSN | RS_FRAMERR | RS_FCSERR)) { 645 dev->stats.rx_errors++; 646 if (frame_status & RS_OFLO) 647 dev->stats.rx_fifo_errors++; 648 if (frame_status & RS_CLSN) 649 dev->stats.collisions++; 650 if (frame_status & RS_FRAMERR) 651 dev->stats.rx_frame_errors++; 652 if (frame_status & RS_FCSERR) 653 dev->stats.rx_crc_errors++; 654 } else { 655 unsigned int frame_length = mf->rcvcnt + ((frame_status & 0x0F) << 8 ); 656 657 skb = netdev_alloc_skb(dev, frame_length + 2); 658 if (!skb) { 659 dev->stats.rx_dropped++; 660 return; 661 } 662 skb_reserve(skb, 2); 663 skb_put_data(skb, mf->data, frame_length); 664 665 skb->protocol = eth_type_trans(skb, dev); 666 netif_rx(skb); 667 dev->stats.rx_packets++; 668 dev->stats.rx_bytes += frame_length; 669 } 670 } 671 672 /* 673 * The PSC has passed us a DMA interrupt event. 674 */ 675 676 static irqreturn_t mace_dma_intr(int irq, void *dev_id) 677 { 678 struct net_device *dev = (struct net_device *) dev_id; 679 struct mace_data *mp = netdev_priv(dev); 680 int left, head; 681 u16 status; 682 u32 baka; 683 684 /* Not sure what this does */ 685 686 while ((baka = psc_read_long(PSC_MYSTERY)) != psc_read_long(PSC_MYSTERY)); 687 if (!(baka & 0x60000000)) return IRQ_NONE; 688 689 /* 690 * Process the read queue 691 */ 692 693 status = psc_read_word(PSC_ENETRD_CTL); 694 695 if (status & 0x2000) { 696 mace_rxdma_reset(dev); 697 } else if (status & 0x0100) { 698 psc_write_word(PSC_ENETRD_CMD + mp->rx_slot, 0x1100); 699 700 left = psc_read_long(PSC_ENETRD_LEN + mp->rx_slot); 701 head = N_RX_RING - left; 702 703 /* Loop through the ring buffer and process new packages */ 704 705 while (mp->rx_tail < head) { 706 mace_dma_rx_frame(dev, (struct mace_frame*) (mp->rx_ring 707 + (mp->rx_tail * MACE_BUFF_SIZE))); 708 mp->rx_tail++; 709 } 710 711 /* If we're out of buffers in this ring then switch to */ 712 /* the other set, otherwise just reactivate this one. */ 713 714 if (!left) { 715 mace_load_rxdma_base(dev, mp->rx_slot); 716 mp->rx_slot ^= 0x10; 717 } else { 718 psc_write_word(PSC_ENETRD_CMD + mp->rx_slot, 0x9800); 719 } 720 } 721 722 /* 723 * Process the write queue 724 */ 725 726 status = psc_read_word(PSC_ENETWR_CTL); 727 728 if (status & 0x2000) { 729 mace_txdma_reset(dev); 730 } else if (status & 0x0100) { 731 psc_write_word(PSC_ENETWR_CMD + mp->tx_sloti, 0x0100); 732 mp->tx_sloti ^= 0x10; 733 mp->tx_count++; 734 } 735 return IRQ_HANDLED; 736 } 737 738 MODULE_LICENSE("GPL"); 739 MODULE_DESCRIPTION("Macintosh MACE ethernet driver"); 740 MODULE_ALIAS("platform:macmace"); 741 742 static int mac_mace_device_remove(struct platform_device *pdev) 743 { 744 struct net_device *dev = platform_get_drvdata(pdev); 745 struct mace_data *mp = netdev_priv(dev); 746 747 unregister_netdev(dev); 748 749 free_irq(dev->irq, dev); 750 free_irq(IRQ_MAC_MACE_DMA, dev); 751 752 dma_free_coherent(mp->device, N_RX_RING * MACE_BUFF_SIZE, 753 mp->rx_ring, mp->rx_ring_phys); 754 dma_free_coherent(mp->device, N_TX_RING * MACE_BUFF_SIZE, 755 mp->tx_ring, mp->tx_ring_phys); 756 757 free_netdev(dev); 758 759 return 0; 760 } 761 762 static struct platform_driver mac_mace_driver = { 763 .probe = mace_probe, 764 .remove = mac_mace_device_remove, 765 .driver = { 766 .name = mac_mace_string, 767 }, 768 }; 769 770 module_platform_driver(mac_mace_driver); 771