1 /* 2 * Network device driver for the MACE ethernet controller on 3 * Apple Powermacs. Assumes it's under a DBDMA controller. 4 * 5 * Copyright (C) 1996 Paul Mackerras. 6 */ 7 8 #include <linux/module.h> 9 #include <linux/kernel.h> 10 #include <linux/netdevice.h> 11 #include <linux/etherdevice.h> 12 #include <linux/delay.h> 13 #include <linux/string.h> 14 #include <linux/timer.h> 15 #include <linux/init.h> 16 #include <linux/interrupt.h> 17 #include <linux/crc32.h> 18 #include <linux/spinlock.h> 19 #include <linux/bitrev.h> 20 #include <linux/slab.h> 21 #include <asm/prom.h> 22 #include <asm/dbdma.h> 23 #include <asm/io.h> 24 #include <asm/pgtable.h> 25 #include <asm/macio.h> 26 27 #include "mace.h" 28 29 static int port_aaui = -1; 30 31 #define N_RX_RING 8 32 #define N_TX_RING 6 33 #define MAX_TX_ACTIVE 1 34 #define NCMDS_TX 1 /* dma commands per element in tx ring */ 35 #define RX_BUFLEN (ETH_FRAME_LEN + 8) 36 #define TX_TIMEOUT HZ /* 1 second */ 37 38 /* Chip rev needs workaround on HW & multicast addr change */ 39 #define BROKEN_ADDRCHG_REV 0x0941 40 41 /* Bits in transmit DMA status */ 42 #define TX_DMA_ERR 0x80 43 44 struct mace_data { 45 volatile struct mace __iomem *mace; 46 volatile struct dbdma_regs __iomem *tx_dma; 47 int tx_dma_intr; 48 volatile struct dbdma_regs __iomem *rx_dma; 49 int rx_dma_intr; 50 volatile struct dbdma_cmd *tx_cmds; /* xmit dma command list */ 51 volatile struct dbdma_cmd *rx_cmds; /* recv dma command list */ 52 struct sk_buff *rx_bufs[N_RX_RING]; 53 int rx_fill; 54 int rx_empty; 55 struct sk_buff *tx_bufs[N_TX_RING]; 56 int tx_fill; 57 int tx_empty; 58 unsigned char maccc; 59 unsigned char tx_fullup; 60 unsigned char tx_active; 61 unsigned char tx_bad_runt; 62 struct timer_list tx_timeout; 63 int timeout_active; 64 int port_aaui; 65 int chipid; 66 struct macio_dev *mdev; 67 spinlock_t lock; 68 }; 69 70 /* 71 * Number of bytes of private data per MACE: allow enough for 72 * the rx and tx dma commands plus a branch dma command each, 73 * and another 16 bytes to allow us to align the dma command 74 * buffers on a 16 byte boundary. 75 */ 76 #define PRIV_BYTES (sizeof(struct mace_data) \ 77 + (N_RX_RING + NCMDS_TX * N_TX_RING + 3) * sizeof(struct dbdma_cmd)) 78 79 static int mace_open(struct net_device *dev); 80 static int mace_close(struct net_device *dev); 81 static netdev_tx_t mace_xmit_start(struct sk_buff *skb, struct net_device *dev); 82 static void mace_set_multicast(struct net_device *dev); 83 static void mace_reset(struct net_device *dev); 84 static int mace_set_address(struct net_device *dev, void *addr); 85 static irqreturn_t mace_interrupt(int irq, void *dev_id); 86 static irqreturn_t mace_txdma_intr(int irq, void *dev_id); 87 static irqreturn_t mace_rxdma_intr(int irq, void *dev_id); 88 static void mace_set_timeout(struct net_device *dev); 89 static void mace_tx_timeout(struct timer_list *t); 90 static inline void dbdma_reset(volatile struct dbdma_regs __iomem *dma); 91 static inline void mace_clean_rings(struct mace_data *mp); 92 static void __mace_set_address(struct net_device *dev, void *addr); 93 94 /* 95 * If we can't get a skbuff when we need it, we use this area for DMA. 96 */ 97 static unsigned char *dummy_buf; 98 99 static const struct net_device_ops mace_netdev_ops = { 100 .ndo_open = mace_open, 101 .ndo_stop = mace_close, 102 .ndo_start_xmit = mace_xmit_start, 103 .ndo_set_rx_mode = mace_set_multicast, 104 .ndo_set_mac_address = mace_set_address, 105 .ndo_validate_addr = eth_validate_addr, 106 }; 107 108 static int mace_probe(struct macio_dev *mdev, const struct of_device_id *match) 109 { 110 struct device_node *mace = macio_get_of_node(mdev); 111 struct net_device *dev; 112 struct mace_data *mp; 113 const unsigned char *addr; 114 int j, rev, rc = -EBUSY; 115 116 if (macio_resource_count(mdev) != 3 || macio_irq_count(mdev) != 3) { 117 printk(KERN_ERR "can't use MACE %pOF: need 3 addrs and 3 irqs\n", 118 mace); 119 return -ENODEV; 120 } 121 122 addr = of_get_property(mace, "mac-address", NULL); 123 if (addr == NULL) { 124 addr = of_get_property(mace, "local-mac-address", NULL); 125 if (addr == NULL) { 126 printk(KERN_ERR "Can't get mac-address for MACE %pOF\n", 127 mace); 128 return -ENODEV; 129 } 130 } 131 132 /* 133 * lazy allocate the driver-wide dummy buffer. (Note that we 134 * never have more than one MACE in the system anyway) 135 */ 136 if (dummy_buf == NULL) { 137 dummy_buf = kmalloc(RX_BUFLEN+2, GFP_KERNEL); 138 if (dummy_buf == NULL) 139 return -ENOMEM; 140 } 141 142 if (macio_request_resources(mdev, "mace")) { 143 printk(KERN_ERR "MACE: can't request IO resources !\n"); 144 return -EBUSY; 145 } 146 147 dev = alloc_etherdev(PRIV_BYTES); 148 if (!dev) { 149 rc = -ENOMEM; 150 goto err_release; 151 } 152 SET_NETDEV_DEV(dev, &mdev->ofdev.dev); 153 154 mp = netdev_priv(dev); 155 mp->mdev = mdev; 156 macio_set_drvdata(mdev, dev); 157 158 dev->base_addr = macio_resource_start(mdev, 0); 159 mp->mace = ioremap(dev->base_addr, 0x1000); 160 if (mp->mace == NULL) { 161 printk(KERN_ERR "MACE: can't map IO resources !\n"); 162 rc = -ENOMEM; 163 goto err_free; 164 } 165 dev->irq = macio_irq(mdev, 0); 166 167 rev = addr[0] == 0 && addr[1] == 0xA0; 168 for (j = 0; j < 6; ++j) { 169 dev->dev_addr[j] = rev ? bitrev8(addr[j]): addr[j]; 170 } 171 mp->chipid = (in_8(&mp->mace->chipid_hi) << 8) | 172 in_8(&mp->mace->chipid_lo); 173 174 175 mp = netdev_priv(dev); 176 mp->maccc = ENXMT | ENRCV; 177 178 mp->tx_dma = ioremap(macio_resource_start(mdev, 1), 0x1000); 179 if (mp->tx_dma == NULL) { 180 printk(KERN_ERR "MACE: can't map TX DMA resources !\n"); 181 rc = -ENOMEM; 182 goto err_unmap_io; 183 } 184 mp->tx_dma_intr = macio_irq(mdev, 1); 185 186 mp->rx_dma = ioremap(macio_resource_start(mdev, 2), 0x1000); 187 if (mp->rx_dma == NULL) { 188 printk(KERN_ERR "MACE: can't map RX DMA resources !\n"); 189 rc = -ENOMEM; 190 goto err_unmap_tx_dma; 191 } 192 mp->rx_dma_intr = macio_irq(mdev, 2); 193 194 mp->tx_cmds = (volatile struct dbdma_cmd *) DBDMA_ALIGN(mp + 1); 195 mp->rx_cmds = mp->tx_cmds + NCMDS_TX * N_TX_RING + 1; 196 197 memset((char *) mp->tx_cmds, 0, 198 (NCMDS_TX*N_TX_RING + N_RX_RING + 2) * sizeof(struct dbdma_cmd)); 199 timer_setup(&mp->tx_timeout, mace_tx_timeout, 0); 200 spin_lock_init(&mp->lock); 201 mp->timeout_active = 0; 202 203 if (port_aaui >= 0) 204 mp->port_aaui = port_aaui; 205 else { 206 /* Apple Network Server uses the AAUI port */ 207 if (of_machine_is_compatible("AAPL,ShinerESB")) 208 mp->port_aaui = 1; 209 else { 210 #ifdef CONFIG_MACE_AAUI_PORT 211 mp->port_aaui = 1; 212 #else 213 mp->port_aaui = 0; 214 #endif 215 } 216 } 217 218 dev->netdev_ops = &mace_netdev_ops; 219 220 /* 221 * Most of what is below could be moved to mace_open() 222 */ 223 mace_reset(dev); 224 225 rc = request_irq(dev->irq, mace_interrupt, 0, "MACE", dev); 226 if (rc) { 227 printk(KERN_ERR "MACE: can't get irq %d\n", dev->irq); 228 goto err_unmap_rx_dma; 229 } 230 rc = request_irq(mp->tx_dma_intr, mace_txdma_intr, 0, "MACE-txdma", dev); 231 if (rc) { 232 printk(KERN_ERR "MACE: can't get irq %d\n", mp->tx_dma_intr); 233 goto err_free_irq; 234 } 235 rc = request_irq(mp->rx_dma_intr, mace_rxdma_intr, 0, "MACE-rxdma", dev); 236 if (rc) { 237 printk(KERN_ERR "MACE: can't get irq %d\n", mp->rx_dma_intr); 238 goto err_free_tx_irq; 239 } 240 241 rc = register_netdev(dev); 242 if (rc) { 243 printk(KERN_ERR "MACE: Cannot register net device, aborting.\n"); 244 goto err_free_rx_irq; 245 } 246 247 printk(KERN_INFO "%s: MACE at %pM, chip revision %d.%d\n", 248 dev->name, dev->dev_addr, 249 mp->chipid >> 8, mp->chipid & 0xff); 250 251 return 0; 252 253 err_free_rx_irq: 254 free_irq(macio_irq(mdev, 2), dev); 255 err_free_tx_irq: 256 free_irq(macio_irq(mdev, 1), dev); 257 err_free_irq: 258 free_irq(macio_irq(mdev, 0), dev); 259 err_unmap_rx_dma: 260 iounmap(mp->rx_dma); 261 err_unmap_tx_dma: 262 iounmap(mp->tx_dma); 263 err_unmap_io: 264 iounmap(mp->mace); 265 err_free: 266 free_netdev(dev); 267 err_release: 268 macio_release_resources(mdev); 269 270 return rc; 271 } 272 273 static int mace_remove(struct macio_dev *mdev) 274 { 275 struct net_device *dev = macio_get_drvdata(mdev); 276 struct mace_data *mp; 277 278 BUG_ON(dev == NULL); 279 280 macio_set_drvdata(mdev, NULL); 281 282 mp = netdev_priv(dev); 283 284 unregister_netdev(dev); 285 286 free_irq(dev->irq, dev); 287 free_irq(mp->tx_dma_intr, dev); 288 free_irq(mp->rx_dma_intr, dev); 289 290 iounmap(mp->rx_dma); 291 iounmap(mp->tx_dma); 292 iounmap(mp->mace); 293 294 free_netdev(dev); 295 296 macio_release_resources(mdev); 297 298 return 0; 299 } 300 301 static void dbdma_reset(volatile struct dbdma_regs __iomem *dma) 302 { 303 int i; 304 305 out_le32(&dma->control, (WAKE|FLUSH|PAUSE|RUN) << 16); 306 307 /* 308 * Yes this looks peculiar, but apparently it needs to be this 309 * way on some machines. 310 */ 311 for (i = 200; i > 0; --i) 312 if (le32_to_cpu(dma->control) & RUN) 313 udelay(1); 314 } 315 316 static void mace_reset(struct net_device *dev) 317 { 318 struct mace_data *mp = netdev_priv(dev); 319 volatile struct mace __iomem *mb = mp->mace; 320 int i; 321 322 /* soft-reset the chip */ 323 i = 200; 324 while (--i) { 325 out_8(&mb->biucc, SWRST); 326 if (in_8(&mb->biucc) & SWRST) { 327 udelay(10); 328 continue; 329 } 330 break; 331 } 332 if (!i) { 333 printk(KERN_ERR "mace: cannot reset chip!\n"); 334 return; 335 } 336 337 out_8(&mb->imr, 0xff); /* disable all intrs for now */ 338 i = in_8(&mb->ir); 339 out_8(&mb->maccc, 0); /* turn off tx, rx */ 340 341 out_8(&mb->biucc, XMTSP_64); 342 out_8(&mb->utr, RTRD); 343 out_8(&mb->fifocc, RCVFW_32 | XMTFW_16 | XMTFWU | RCVFWU | XMTBRST); 344 out_8(&mb->xmtfc, AUTO_PAD_XMIT); /* auto-pad short frames */ 345 out_8(&mb->rcvfc, 0); 346 347 /* load up the hardware address */ 348 __mace_set_address(dev, dev->dev_addr); 349 350 /* clear the multicast filter */ 351 if (mp->chipid == BROKEN_ADDRCHG_REV) 352 out_8(&mb->iac, LOGADDR); 353 else { 354 out_8(&mb->iac, ADDRCHG | LOGADDR); 355 while ((in_8(&mb->iac) & ADDRCHG) != 0) 356 ; 357 } 358 for (i = 0; i < 8; ++i) 359 out_8(&mb->ladrf, 0); 360 361 /* done changing address */ 362 if (mp->chipid != BROKEN_ADDRCHG_REV) 363 out_8(&mb->iac, 0); 364 365 if (mp->port_aaui) 366 out_8(&mb->plscc, PORTSEL_AUI + ENPLSIO); 367 else 368 out_8(&mb->plscc, PORTSEL_GPSI + ENPLSIO); 369 } 370 371 static void __mace_set_address(struct net_device *dev, void *addr) 372 { 373 struct mace_data *mp = netdev_priv(dev); 374 volatile struct mace __iomem *mb = mp->mace; 375 unsigned char *p = addr; 376 int i; 377 378 /* load up the hardware address */ 379 if (mp->chipid == BROKEN_ADDRCHG_REV) 380 out_8(&mb->iac, PHYADDR); 381 else { 382 out_8(&mb->iac, ADDRCHG | PHYADDR); 383 while ((in_8(&mb->iac) & ADDRCHG) != 0) 384 ; 385 } 386 for (i = 0; i < 6; ++i) 387 out_8(&mb->padr, dev->dev_addr[i] = p[i]); 388 if (mp->chipid != BROKEN_ADDRCHG_REV) 389 out_8(&mb->iac, 0); 390 } 391 392 static int mace_set_address(struct net_device *dev, void *addr) 393 { 394 struct mace_data *mp = netdev_priv(dev); 395 volatile struct mace __iomem *mb = mp->mace; 396 unsigned long flags; 397 398 spin_lock_irqsave(&mp->lock, flags); 399 400 __mace_set_address(dev, addr); 401 402 /* note: setting ADDRCHG clears ENRCV */ 403 out_8(&mb->maccc, mp->maccc); 404 405 spin_unlock_irqrestore(&mp->lock, flags); 406 return 0; 407 } 408 409 static inline void mace_clean_rings(struct mace_data *mp) 410 { 411 int i; 412 413 /* free some skb's */ 414 for (i = 0; i < N_RX_RING; ++i) { 415 if (mp->rx_bufs[i] != NULL) { 416 dev_kfree_skb(mp->rx_bufs[i]); 417 mp->rx_bufs[i] = NULL; 418 } 419 } 420 for (i = mp->tx_empty; i != mp->tx_fill; ) { 421 dev_kfree_skb(mp->tx_bufs[i]); 422 if (++i >= N_TX_RING) 423 i = 0; 424 } 425 } 426 427 static int mace_open(struct net_device *dev) 428 { 429 struct mace_data *mp = netdev_priv(dev); 430 volatile struct mace __iomem *mb = mp->mace; 431 volatile struct dbdma_regs __iomem *rd = mp->rx_dma; 432 volatile struct dbdma_regs __iomem *td = mp->tx_dma; 433 volatile struct dbdma_cmd *cp; 434 int i; 435 struct sk_buff *skb; 436 unsigned char *data; 437 438 /* reset the chip */ 439 mace_reset(dev); 440 441 /* initialize list of sk_buffs for receiving and set up recv dma */ 442 mace_clean_rings(mp); 443 memset((char *)mp->rx_cmds, 0, N_RX_RING * sizeof(struct dbdma_cmd)); 444 cp = mp->rx_cmds; 445 for (i = 0; i < N_RX_RING - 1; ++i) { 446 skb = netdev_alloc_skb(dev, RX_BUFLEN + 2); 447 if (!skb) { 448 data = dummy_buf; 449 } else { 450 skb_reserve(skb, 2); /* so IP header lands on 4-byte bdry */ 451 data = skb->data; 452 } 453 mp->rx_bufs[i] = skb; 454 cp->req_count = cpu_to_le16(RX_BUFLEN); 455 cp->command = cpu_to_le16(INPUT_LAST + INTR_ALWAYS); 456 cp->phy_addr = cpu_to_le32(virt_to_bus(data)); 457 cp->xfer_status = 0; 458 ++cp; 459 } 460 mp->rx_bufs[i] = NULL; 461 cp->command = cpu_to_le16(DBDMA_STOP); 462 mp->rx_fill = i; 463 mp->rx_empty = 0; 464 465 /* Put a branch back to the beginning of the receive command list */ 466 ++cp; 467 cp->command = cpu_to_le16(DBDMA_NOP + BR_ALWAYS); 468 cp->cmd_dep = cpu_to_le32(virt_to_bus(mp->rx_cmds)); 469 470 /* start rx dma */ 471 out_le32(&rd->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */ 472 out_le32(&rd->cmdptr, virt_to_bus(mp->rx_cmds)); 473 out_le32(&rd->control, (RUN << 16) | RUN); 474 475 /* put a branch at the end of the tx command list */ 476 cp = mp->tx_cmds + NCMDS_TX * N_TX_RING; 477 cp->command = cpu_to_le16(DBDMA_NOP + BR_ALWAYS); 478 cp->cmd_dep = cpu_to_le32(virt_to_bus(mp->tx_cmds)); 479 480 /* reset tx dma */ 481 out_le32(&td->control, (RUN|PAUSE|FLUSH|WAKE) << 16); 482 out_le32(&td->cmdptr, virt_to_bus(mp->tx_cmds)); 483 mp->tx_fill = 0; 484 mp->tx_empty = 0; 485 mp->tx_fullup = 0; 486 mp->tx_active = 0; 487 mp->tx_bad_runt = 0; 488 489 /* turn it on! */ 490 out_8(&mb->maccc, mp->maccc); 491 /* enable all interrupts except receive interrupts */ 492 out_8(&mb->imr, RCVINT); 493 494 return 0; 495 } 496 497 static int mace_close(struct net_device *dev) 498 { 499 struct mace_data *mp = netdev_priv(dev); 500 volatile struct mace __iomem *mb = mp->mace; 501 volatile struct dbdma_regs __iomem *rd = mp->rx_dma; 502 volatile struct dbdma_regs __iomem *td = mp->tx_dma; 503 504 /* disable rx and tx */ 505 out_8(&mb->maccc, 0); 506 out_8(&mb->imr, 0xff); /* disable all intrs */ 507 508 /* disable rx and tx dma */ 509 rd->control = cpu_to_le32((RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */ 510 td->control = cpu_to_le32((RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */ 511 512 mace_clean_rings(mp); 513 514 return 0; 515 } 516 517 static inline void mace_set_timeout(struct net_device *dev) 518 { 519 struct mace_data *mp = netdev_priv(dev); 520 521 if (mp->timeout_active) 522 del_timer(&mp->tx_timeout); 523 mp->tx_timeout.expires = jiffies + TX_TIMEOUT; 524 add_timer(&mp->tx_timeout); 525 mp->timeout_active = 1; 526 } 527 528 static netdev_tx_t mace_xmit_start(struct sk_buff *skb, struct net_device *dev) 529 { 530 struct mace_data *mp = netdev_priv(dev); 531 volatile struct dbdma_regs __iomem *td = mp->tx_dma; 532 volatile struct dbdma_cmd *cp, *np; 533 unsigned long flags; 534 int fill, next, len; 535 536 /* see if there's a free slot in the tx ring */ 537 spin_lock_irqsave(&mp->lock, flags); 538 fill = mp->tx_fill; 539 next = fill + 1; 540 if (next >= N_TX_RING) 541 next = 0; 542 if (next == mp->tx_empty) { 543 netif_stop_queue(dev); 544 mp->tx_fullup = 1; 545 spin_unlock_irqrestore(&mp->lock, flags); 546 return NETDEV_TX_BUSY; /* can't take it at the moment */ 547 } 548 spin_unlock_irqrestore(&mp->lock, flags); 549 550 /* partially fill in the dma command block */ 551 len = skb->len; 552 if (len > ETH_FRAME_LEN) { 553 printk(KERN_DEBUG "mace: xmit frame too long (%d)\n", len); 554 len = ETH_FRAME_LEN; 555 } 556 mp->tx_bufs[fill] = skb; 557 cp = mp->tx_cmds + NCMDS_TX * fill; 558 cp->req_count = cpu_to_le16(len); 559 cp->phy_addr = cpu_to_le32(virt_to_bus(skb->data)); 560 561 np = mp->tx_cmds + NCMDS_TX * next; 562 out_le16(&np->command, DBDMA_STOP); 563 564 /* poke the tx dma channel */ 565 spin_lock_irqsave(&mp->lock, flags); 566 mp->tx_fill = next; 567 if (!mp->tx_bad_runt && mp->tx_active < MAX_TX_ACTIVE) { 568 out_le16(&cp->xfer_status, 0); 569 out_le16(&cp->command, OUTPUT_LAST); 570 out_le32(&td->control, ((RUN|WAKE) << 16) + (RUN|WAKE)); 571 ++mp->tx_active; 572 mace_set_timeout(dev); 573 } 574 if (++next >= N_TX_RING) 575 next = 0; 576 if (next == mp->tx_empty) 577 netif_stop_queue(dev); 578 spin_unlock_irqrestore(&mp->lock, flags); 579 580 return NETDEV_TX_OK; 581 } 582 583 static void mace_set_multicast(struct net_device *dev) 584 { 585 struct mace_data *mp = netdev_priv(dev); 586 volatile struct mace __iomem *mb = mp->mace; 587 int i; 588 u32 crc; 589 unsigned long flags; 590 591 spin_lock_irqsave(&mp->lock, flags); 592 mp->maccc &= ~PROM; 593 if (dev->flags & IFF_PROMISC) { 594 mp->maccc |= PROM; 595 } else { 596 unsigned char multicast_filter[8]; 597 struct netdev_hw_addr *ha; 598 599 if (dev->flags & IFF_ALLMULTI) { 600 for (i = 0; i < 8; i++) 601 multicast_filter[i] = 0xff; 602 } else { 603 for (i = 0; i < 8; i++) 604 multicast_filter[i] = 0; 605 netdev_for_each_mc_addr(ha, dev) { 606 crc = ether_crc_le(6, ha->addr); 607 i = crc >> 26; /* bit number in multicast_filter */ 608 multicast_filter[i >> 3] |= 1 << (i & 7); 609 } 610 } 611 #if 0 612 printk("Multicast filter :"); 613 for (i = 0; i < 8; i++) 614 printk("%02x ", multicast_filter[i]); 615 printk("\n"); 616 #endif 617 618 if (mp->chipid == BROKEN_ADDRCHG_REV) 619 out_8(&mb->iac, LOGADDR); 620 else { 621 out_8(&mb->iac, ADDRCHG | LOGADDR); 622 while ((in_8(&mb->iac) & ADDRCHG) != 0) 623 ; 624 } 625 for (i = 0; i < 8; ++i) 626 out_8(&mb->ladrf, multicast_filter[i]); 627 if (mp->chipid != BROKEN_ADDRCHG_REV) 628 out_8(&mb->iac, 0); 629 } 630 /* reset maccc */ 631 out_8(&mb->maccc, mp->maccc); 632 spin_unlock_irqrestore(&mp->lock, flags); 633 } 634 635 static void mace_handle_misc_intrs(struct mace_data *mp, int intr, struct net_device *dev) 636 { 637 volatile struct mace __iomem *mb = mp->mace; 638 static int mace_babbles, mace_jabbers; 639 640 if (intr & MPCO) 641 dev->stats.rx_missed_errors += 256; 642 dev->stats.rx_missed_errors += in_8(&mb->mpc); /* reading clears it */ 643 if (intr & RNTPCO) 644 dev->stats.rx_length_errors += 256; 645 dev->stats.rx_length_errors += in_8(&mb->rntpc); /* reading clears it */ 646 if (intr & CERR) 647 ++dev->stats.tx_heartbeat_errors; 648 if (intr & BABBLE) 649 if (mace_babbles++ < 4) 650 printk(KERN_DEBUG "mace: babbling transmitter\n"); 651 if (intr & JABBER) 652 if (mace_jabbers++ < 4) 653 printk(KERN_DEBUG "mace: jabbering transceiver\n"); 654 } 655 656 static irqreturn_t mace_interrupt(int irq, void *dev_id) 657 { 658 struct net_device *dev = (struct net_device *) dev_id; 659 struct mace_data *mp = netdev_priv(dev); 660 volatile struct mace __iomem *mb = mp->mace; 661 volatile struct dbdma_regs __iomem *td = mp->tx_dma; 662 volatile struct dbdma_cmd *cp; 663 int intr, fs, i, stat, x; 664 int xcount, dstat; 665 unsigned long flags; 666 /* static int mace_last_fs, mace_last_xcount; */ 667 668 spin_lock_irqsave(&mp->lock, flags); 669 intr = in_8(&mb->ir); /* read interrupt register */ 670 in_8(&mb->xmtrc); /* get retries */ 671 mace_handle_misc_intrs(mp, intr, dev); 672 673 i = mp->tx_empty; 674 while (in_8(&mb->pr) & XMTSV) { 675 del_timer(&mp->tx_timeout); 676 mp->timeout_active = 0; 677 /* 678 * Clear any interrupt indication associated with this status 679 * word. This appears to unlatch any error indication from 680 * the DMA controller. 681 */ 682 intr = in_8(&mb->ir); 683 if (intr != 0) 684 mace_handle_misc_intrs(mp, intr, dev); 685 if (mp->tx_bad_runt) { 686 fs = in_8(&mb->xmtfs); 687 mp->tx_bad_runt = 0; 688 out_8(&mb->xmtfc, AUTO_PAD_XMIT); 689 continue; 690 } 691 dstat = le32_to_cpu(td->status); 692 /* stop DMA controller */ 693 out_le32(&td->control, RUN << 16); 694 /* 695 * xcount is the number of complete frames which have been 696 * written to the fifo but for which status has not been read. 697 */ 698 xcount = (in_8(&mb->fifofc) >> XMTFC_SH) & XMTFC_MASK; 699 if (xcount == 0 || (dstat & DEAD)) { 700 /* 701 * If a packet was aborted before the DMA controller has 702 * finished transferring it, it seems that there are 2 bytes 703 * which are stuck in some buffer somewhere. These will get 704 * transmitted as soon as we read the frame status (which 705 * reenables the transmit data transfer request). Turning 706 * off the DMA controller and/or resetting the MACE doesn't 707 * help. So we disable auto-padding and FCS transmission 708 * so the two bytes will only be a runt packet which should 709 * be ignored by other stations. 710 */ 711 out_8(&mb->xmtfc, DXMTFCS); 712 } 713 fs = in_8(&mb->xmtfs); 714 if ((fs & XMTSV) == 0) { 715 printk(KERN_ERR "mace: xmtfs not valid! (fs=%x xc=%d ds=%x)\n", 716 fs, xcount, dstat); 717 mace_reset(dev); 718 /* 719 * XXX mace likes to hang the machine after a xmtfs error. 720 * This is hard to reproduce, resetting *may* help 721 */ 722 } 723 cp = mp->tx_cmds + NCMDS_TX * i; 724 stat = le16_to_cpu(cp->xfer_status); 725 if ((fs & (UFLO|LCOL|LCAR|RTRY)) || (dstat & DEAD) || xcount == 0) { 726 /* 727 * Check whether there were in fact 2 bytes written to 728 * the transmit FIFO. 729 */ 730 udelay(1); 731 x = (in_8(&mb->fifofc) >> XMTFC_SH) & XMTFC_MASK; 732 if (x != 0) { 733 /* there were two bytes with an end-of-packet indication */ 734 mp->tx_bad_runt = 1; 735 mace_set_timeout(dev); 736 } else { 737 /* 738 * Either there weren't the two bytes buffered up, or they 739 * didn't have an end-of-packet indication. 740 * We flush the transmit FIFO just in case (by setting the 741 * XMTFWU bit with the transmitter disabled). 742 */ 743 out_8(&mb->maccc, in_8(&mb->maccc) & ~ENXMT); 744 out_8(&mb->fifocc, in_8(&mb->fifocc) | XMTFWU); 745 udelay(1); 746 out_8(&mb->maccc, in_8(&mb->maccc) | ENXMT); 747 out_8(&mb->xmtfc, AUTO_PAD_XMIT); 748 } 749 } 750 /* dma should have finished */ 751 if (i == mp->tx_fill) { 752 printk(KERN_DEBUG "mace: tx ring ran out? (fs=%x xc=%d ds=%x)\n", 753 fs, xcount, dstat); 754 continue; 755 } 756 /* Update stats */ 757 if (fs & (UFLO|LCOL|LCAR|RTRY)) { 758 ++dev->stats.tx_errors; 759 if (fs & LCAR) 760 ++dev->stats.tx_carrier_errors; 761 if (fs & (UFLO|LCOL|RTRY)) 762 ++dev->stats.tx_aborted_errors; 763 } else { 764 dev->stats.tx_bytes += mp->tx_bufs[i]->len; 765 ++dev->stats.tx_packets; 766 } 767 dev_kfree_skb_irq(mp->tx_bufs[i]); 768 --mp->tx_active; 769 if (++i >= N_TX_RING) 770 i = 0; 771 #if 0 772 mace_last_fs = fs; 773 mace_last_xcount = xcount; 774 #endif 775 } 776 777 if (i != mp->tx_empty) { 778 mp->tx_fullup = 0; 779 netif_wake_queue(dev); 780 } 781 mp->tx_empty = i; 782 i += mp->tx_active; 783 if (i >= N_TX_RING) 784 i -= N_TX_RING; 785 if (!mp->tx_bad_runt && i != mp->tx_fill && mp->tx_active < MAX_TX_ACTIVE) { 786 do { 787 /* set up the next one */ 788 cp = mp->tx_cmds + NCMDS_TX * i; 789 out_le16(&cp->xfer_status, 0); 790 out_le16(&cp->command, OUTPUT_LAST); 791 ++mp->tx_active; 792 if (++i >= N_TX_RING) 793 i = 0; 794 } while (i != mp->tx_fill && mp->tx_active < MAX_TX_ACTIVE); 795 out_le32(&td->control, ((RUN|WAKE) << 16) + (RUN|WAKE)); 796 mace_set_timeout(dev); 797 } 798 spin_unlock_irqrestore(&mp->lock, flags); 799 return IRQ_HANDLED; 800 } 801 802 static void mace_tx_timeout(struct timer_list *t) 803 { 804 struct mace_data *mp = from_timer(mp, t, tx_timeout); 805 struct net_device *dev = macio_get_drvdata(mp->mdev); 806 volatile struct mace __iomem *mb = mp->mace; 807 volatile struct dbdma_regs __iomem *td = mp->tx_dma; 808 volatile struct dbdma_regs __iomem *rd = mp->rx_dma; 809 volatile struct dbdma_cmd *cp; 810 unsigned long flags; 811 int i; 812 813 spin_lock_irqsave(&mp->lock, flags); 814 mp->timeout_active = 0; 815 if (mp->tx_active == 0 && !mp->tx_bad_runt) 816 goto out; 817 818 /* update various counters */ 819 mace_handle_misc_intrs(mp, in_8(&mb->ir), dev); 820 821 cp = mp->tx_cmds + NCMDS_TX * mp->tx_empty; 822 823 /* turn off both tx and rx and reset the chip */ 824 out_8(&mb->maccc, 0); 825 printk(KERN_ERR "mace: transmit timeout - resetting\n"); 826 dbdma_reset(td); 827 mace_reset(dev); 828 829 /* restart rx dma */ 830 cp = bus_to_virt(le32_to_cpu(rd->cmdptr)); 831 dbdma_reset(rd); 832 out_le16(&cp->xfer_status, 0); 833 out_le32(&rd->cmdptr, virt_to_bus(cp)); 834 out_le32(&rd->control, (RUN << 16) | RUN); 835 836 /* fix up the transmit side */ 837 i = mp->tx_empty; 838 mp->tx_active = 0; 839 ++dev->stats.tx_errors; 840 if (mp->tx_bad_runt) { 841 mp->tx_bad_runt = 0; 842 } else if (i != mp->tx_fill) { 843 dev_kfree_skb(mp->tx_bufs[i]); 844 if (++i >= N_TX_RING) 845 i = 0; 846 mp->tx_empty = i; 847 } 848 mp->tx_fullup = 0; 849 netif_wake_queue(dev); 850 if (i != mp->tx_fill) { 851 cp = mp->tx_cmds + NCMDS_TX * i; 852 out_le16(&cp->xfer_status, 0); 853 out_le16(&cp->command, OUTPUT_LAST); 854 out_le32(&td->cmdptr, virt_to_bus(cp)); 855 out_le32(&td->control, (RUN << 16) | RUN); 856 ++mp->tx_active; 857 mace_set_timeout(dev); 858 } 859 860 /* turn it back on */ 861 out_8(&mb->imr, RCVINT); 862 out_8(&mb->maccc, mp->maccc); 863 864 out: 865 spin_unlock_irqrestore(&mp->lock, flags); 866 } 867 868 static irqreturn_t mace_txdma_intr(int irq, void *dev_id) 869 { 870 return IRQ_HANDLED; 871 } 872 873 static irqreturn_t mace_rxdma_intr(int irq, void *dev_id) 874 { 875 struct net_device *dev = (struct net_device *) dev_id; 876 struct mace_data *mp = netdev_priv(dev); 877 volatile struct dbdma_regs __iomem *rd = mp->rx_dma; 878 volatile struct dbdma_cmd *cp, *np; 879 int i, nb, stat, next; 880 struct sk_buff *skb; 881 unsigned frame_status; 882 static int mace_lost_status; 883 unsigned char *data; 884 unsigned long flags; 885 886 spin_lock_irqsave(&mp->lock, flags); 887 for (i = mp->rx_empty; i != mp->rx_fill; ) { 888 cp = mp->rx_cmds + i; 889 stat = le16_to_cpu(cp->xfer_status); 890 if ((stat & ACTIVE) == 0) { 891 next = i + 1; 892 if (next >= N_RX_RING) 893 next = 0; 894 np = mp->rx_cmds + next; 895 if (next != mp->rx_fill && 896 (le16_to_cpu(np->xfer_status) & ACTIVE) != 0) { 897 printk(KERN_DEBUG "mace: lost a status word\n"); 898 ++mace_lost_status; 899 } else 900 break; 901 } 902 nb = le16_to_cpu(cp->req_count) - le16_to_cpu(cp->res_count); 903 out_le16(&cp->command, DBDMA_STOP); 904 /* got a packet, have a look at it */ 905 skb = mp->rx_bufs[i]; 906 if (!skb) { 907 ++dev->stats.rx_dropped; 908 } else if (nb > 8) { 909 data = skb->data; 910 frame_status = (data[nb-3] << 8) + data[nb-4]; 911 if (frame_status & (RS_OFLO|RS_CLSN|RS_FRAMERR|RS_FCSERR)) { 912 ++dev->stats.rx_errors; 913 if (frame_status & RS_OFLO) 914 ++dev->stats.rx_over_errors; 915 if (frame_status & RS_FRAMERR) 916 ++dev->stats.rx_frame_errors; 917 if (frame_status & RS_FCSERR) 918 ++dev->stats.rx_crc_errors; 919 } else { 920 /* Mace feature AUTO_STRIP_RCV is on by default, dropping the 921 * FCS on frames with 802.3 headers. This means that Ethernet 922 * frames have 8 extra octets at the end, while 802.3 frames 923 * have only 4. We need to correctly account for this. */ 924 if (*(unsigned short *)(data+12) < 1536) /* 802.3 header */ 925 nb -= 4; 926 else /* Ethernet header; mace includes FCS */ 927 nb -= 8; 928 skb_put(skb, nb); 929 skb->protocol = eth_type_trans(skb, dev); 930 dev->stats.rx_bytes += skb->len; 931 netif_rx(skb); 932 mp->rx_bufs[i] = NULL; 933 ++dev->stats.rx_packets; 934 } 935 } else { 936 ++dev->stats.rx_errors; 937 ++dev->stats.rx_length_errors; 938 } 939 940 /* advance to next */ 941 if (++i >= N_RX_RING) 942 i = 0; 943 } 944 mp->rx_empty = i; 945 946 i = mp->rx_fill; 947 for (;;) { 948 next = i + 1; 949 if (next >= N_RX_RING) 950 next = 0; 951 if (next == mp->rx_empty) 952 break; 953 cp = mp->rx_cmds + i; 954 skb = mp->rx_bufs[i]; 955 if (!skb) { 956 skb = netdev_alloc_skb(dev, RX_BUFLEN + 2); 957 if (skb) { 958 skb_reserve(skb, 2); 959 mp->rx_bufs[i] = skb; 960 } 961 } 962 cp->req_count = cpu_to_le16(RX_BUFLEN); 963 data = skb? skb->data: dummy_buf; 964 cp->phy_addr = cpu_to_le32(virt_to_bus(data)); 965 out_le16(&cp->xfer_status, 0); 966 out_le16(&cp->command, INPUT_LAST + INTR_ALWAYS); 967 #if 0 968 if ((le32_to_cpu(rd->status) & ACTIVE) != 0) { 969 out_le32(&rd->control, (PAUSE << 16) | PAUSE); 970 while ((in_le32(&rd->status) & ACTIVE) != 0) 971 ; 972 } 973 #endif 974 i = next; 975 } 976 if (i != mp->rx_fill) { 977 out_le32(&rd->control, ((RUN|WAKE) << 16) | (RUN|WAKE)); 978 mp->rx_fill = i; 979 } 980 spin_unlock_irqrestore(&mp->lock, flags); 981 return IRQ_HANDLED; 982 } 983 984 static const struct of_device_id mace_match[] = 985 { 986 { 987 .name = "mace", 988 }, 989 {}, 990 }; 991 MODULE_DEVICE_TABLE (of, mace_match); 992 993 static struct macio_driver mace_driver = 994 { 995 .driver = { 996 .name = "mace", 997 .owner = THIS_MODULE, 998 .of_match_table = mace_match, 999 }, 1000 .probe = mace_probe, 1001 .remove = mace_remove, 1002 }; 1003 1004 1005 static int __init mace_init(void) 1006 { 1007 return macio_register_driver(&mace_driver); 1008 } 1009 1010 static void __exit mace_cleanup(void) 1011 { 1012 macio_unregister_driver(&mace_driver); 1013 1014 kfree(dummy_buf); 1015 dummy_buf = NULL; 1016 } 1017 1018 MODULE_AUTHOR("Paul Mackerras"); 1019 MODULE_DESCRIPTION("PowerMac MACE driver."); 1020 module_param(port_aaui, int, 0); 1021 MODULE_PARM_DESC(port_aaui, "MACE uses AAUI port (0-1)"); 1022 MODULE_LICENSE("GPL"); 1023 1024 module_init(mace_init); 1025 module_exit(mace_cleanup); 1026