1 /* 2 * sgiseeq.c: Seeq8003 ethernet driver for SGI machines. 3 * 4 * Copyright (C) 1996 David S. Miller (davem@davemloft.net) 5 */ 6 7 #undef DEBUG 8 9 #include <linux/dma-mapping.h> 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/slab.h> 13 #include <linux/errno.h> 14 #include <linux/types.h> 15 #include <linux/interrupt.h> 16 #include <linux/string.h> 17 #include <linux/delay.h> 18 #include <linux/netdevice.h> 19 #include <linux/platform_device.h> 20 #include <linux/etherdevice.h> 21 #include <linux/skbuff.h> 22 23 #include <asm/sgi/hpc3.h> 24 #include <asm/sgi/ip22.h> 25 #include <asm/sgi/seeq.h> 26 27 #include "sgiseeq.h" 28 29 static char *sgiseeqstr = "SGI Seeq8003"; 30 31 /* 32 * If you want speed, you do something silly, it always has worked for me. So, 33 * with that in mind, I've decided to make this driver look completely like a 34 * stupid Lance from a driver architecture perspective. Only difference is that 35 * here our "ring buffer" looks and acts like a real Lance one does but is 36 * laid out like how the HPC DMA and the Seeq want it to. You'd be surprised 37 * how a stupid idea like this can pay off in performance, not to mention 38 * making this driver 2,000 times easier to write. ;-) 39 */ 40 41 /* Tune these if we tend to run out often etc. */ 42 #define SEEQ_RX_BUFFERS 16 43 #define SEEQ_TX_BUFFERS 16 44 45 #define PKT_BUF_SZ 1584 46 47 #define NEXT_RX(i) (((i) + 1) & (SEEQ_RX_BUFFERS - 1)) 48 #define NEXT_TX(i) (((i) + 1) & (SEEQ_TX_BUFFERS - 1)) 49 #define PREV_RX(i) (((i) - 1) & (SEEQ_RX_BUFFERS - 1)) 50 #define PREV_TX(i) (((i) - 1) & (SEEQ_TX_BUFFERS - 1)) 51 52 #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \ 53 sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \ 54 sp->tx_old - sp->tx_new - 1) 55 56 #define VIRT_TO_DMA(sp, v) ((sp)->srings_dma + \ 57 (dma_addr_t)((unsigned long)(v) - \ 58 (unsigned long)((sp)->rx_desc))) 59 60 /* Copy frames shorter than rx_copybreak, otherwise pass on up in 61 * a full sized sk_buff. Value of 100 stolen from tulip.c (!alpha). 62 */ 63 static int rx_copybreak = 100; 64 65 #define PAD_SIZE (128 - sizeof(struct hpc_dma_desc) - sizeof(void *)) 66 67 struct sgiseeq_rx_desc { 68 volatile struct hpc_dma_desc rdma; 69 u8 padding[PAD_SIZE]; 70 struct sk_buff *skb; 71 }; 72 73 struct sgiseeq_tx_desc { 74 volatile struct hpc_dma_desc tdma; 75 u8 padding[PAD_SIZE]; 76 struct sk_buff *skb; 77 }; 78 79 /* 80 * Warning: This structure is laid out in a certain way because HPC dma 81 * descriptors must be 8-byte aligned. So don't touch this without 82 * some care. 83 */ 84 struct sgiseeq_init_block { /* Note the name ;-) */ 85 struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS]; 86 struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS]; 87 }; 88 89 struct sgiseeq_private { 90 struct sgiseeq_init_block *srings; 91 dma_addr_t srings_dma; 92 93 /* Ptrs to the descriptors in uncached space. */ 94 struct sgiseeq_rx_desc *rx_desc; 95 struct sgiseeq_tx_desc *tx_desc; 96 97 char *name; 98 struct hpc3_ethregs *hregs; 99 struct sgiseeq_regs *sregs; 100 101 /* Ring entry counters. */ 102 unsigned int rx_new, tx_new; 103 unsigned int rx_old, tx_old; 104 105 int is_edlc; 106 unsigned char control; 107 unsigned char mode; 108 109 spinlock_t tx_lock; 110 }; 111 112 static inline void dma_sync_desc_cpu(struct net_device *dev, void *addr) 113 { 114 dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc), 115 DMA_FROM_DEVICE); 116 } 117 118 static inline void dma_sync_desc_dev(struct net_device *dev, void *addr) 119 { 120 dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc), 121 DMA_TO_DEVICE); 122 } 123 124 static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs) 125 { 126 hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ; 127 udelay(20); 128 hregs->reset = 0; 129 } 130 131 static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs, 132 struct sgiseeq_regs *sregs) 133 { 134 hregs->rx_ctrl = hregs->tx_ctrl = 0; 135 hpc3_eth_reset(hregs); 136 } 137 138 #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \ 139 SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC) 140 141 static inline void seeq_go(struct sgiseeq_private *sp, 142 struct hpc3_ethregs *hregs, 143 struct sgiseeq_regs *sregs) 144 { 145 sregs->rstat = sp->mode | RSTAT_GO_BITS; 146 hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE; 147 } 148 149 static inline void __sgiseeq_set_mac_address(struct net_device *dev) 150 { 151 struct sgiseeq_private *sp = netdev_priv(dev); 152 struct sgiseeq_regs *sregs = sp->sregs; 153 int i; 154 155 sregs->tstat = SEEQ_TCMD_RB0; 156 for (i = 0; i < 6; i++) 157 sregs->rw.eth_addr[i] = dev->dev_addr[i]; 158 } 159 160 static int sgiseeq_set_mac_address(struct net_device *dev, void *addr) 161 { 162 struct sgiseeq_private *sp = netdev_priv(dev); 163 struct sockaddr *sa = addr; 164 165 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 166 167 spin_lock_irq(&sp->tx_lock); 168 __sgiseeq_set_mac_address(dev); 169 spin_unlock_irq(&sp->tx_lock); 170 171 return 0; 172 } 173 174 #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD) 175 #define RCNTCFG_INIT (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE) 176 #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT)) 177 178 static int seeq_init_ring(struct net_device *dev) 179 { 180 struct sgiseeq_private *sp = netdev_priv(dev); 181 int i; 182 183 netif_stop_queue(dev); 184 sp->rx_new = sp->tx_new = 0; 185 sp->rx_old = sp->tx_old = 0; 186 187 __sgiseeq_set_mac_address(dev); 188 189 /* Setup tx ring. */ 190 for(i = 0; i < SEEQ_TX_BUFFERS; i++) { 191 sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT; 192 dma_sync_desc_dev(dev, &sp->tx_desc[i]); 193 } 194 195 /* And now the rx ring. */ 196 for (i = 0; i < SEEQ_RX_BUFFERS; i++) { 197 if (!sp->rx_desc[i].skb) { 198 dma_addr_t dma_addr; 199 struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ); 200 201 if (skb == NULL) 202 return -ENOMEM; 203 skb_reserve(skb, 2); 204 dma_addr = dma_map_single(dev->dev.parent, 205 skb->data - 2, 206 PKT_BUF_SZ, DMA_FROM_DEVICE); 207 sp->rx_desc[i].skb = skb; 208 sp->rx_desc[i].rdma.pbuf = dma_addr; 209 } 210 sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT; 211 dma_sync_desc_dev(dev, &sp->rx_desc[i]); 212 } 213 sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR; 214 dma_sync_desc_dev(dev, &sp->rx_desc[i - 1]); 215 return 0; 216 } 217 218 static void seeq_purge_ring(struct net_device *dev) 219 { 220 struct sgiseeq_private *sp = netdev_priv(dev); 221 int i; 222 223 /* clear tx ring. */ 224 for (i = 0; i < SEEQ_TX_BUFFERS; i++) { 225 if (sp->tx_desc[i].skb) { 226 dev_kfree_skb(sp->tx_desc[i].skb); 227 sp->tx_desc[i].skb = NULL; 228 } 229 } 230 231 /* And now the rx ring. */ 232 for (i = 0; i < SEEQ_RX_BUFFERS; i++) { 233 if (sp->rx_desc[i].skb) { 234 dev_kfree_skb(sp->rx_desc[i].skb); 235 sp->rx_desc[i].skb = NULL; 236 } 237 } 238 } 239 240 #ifdef DEBUG 241 static struct sgiseeq_private *gpriv; 242 static struct net_device *gdev; 243 244 static void sgiseeq_dump_rings(void) 245 { 246 static int once; 247 struct sgiseeq_rx_desc *r = gpriv->rx_desc; 248 struct sgiseeq_tx_desc *t = gpriv->tx_desc; 249 struct hpc3_ethregs *hregs = gpriv->hregs; 250 int i; 251 252 if (once) 253 return; 254 once++; 255 printk("RING DUMP:\n"); 256 for (i = 0; i < SEEQ_RX_BUFFERS; i++) { 257 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ", 258 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo, 259 r[i].rdma.pnext); 260 i += 1; 261 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n", 262 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo, 263 r[i].rdma.pnext); 264 } 265 for (i = 0; i < SEEQ_TX_BUFFERS; i++) { 266 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ", 267 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo, 268 t[i].tdma.pnext); 269 i += 1; 270 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n", 271 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo, 272 t[i].tdma.pnext); 273 } 274 printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n", 275 gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old); 276 printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n", 277 hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl); 278 printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n", 279 hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl); 280 } 281 #endif 282 283 #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF) 284 #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2) 285 286 static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp, 287 struct sgiseeq_regs *sregs) 288 { 289 struct hpc3_ethregs *hregs = sp->hregs; 290 int err; 291 292 reset_hpc3_and_seeq(hregs, sregs); 293 err = seeq_init_ring(dev); 294 if (err) 295 return err; 296 297 /* Setup to field the proper interrupt types. */ 298 if (sp->is_edlc) { 299 sregs->tstat = TSTAT_INIT_EDLC; 300 sregs->rw.wregs.control = sp->control; 301 sregs->rw.wregs.frame_gap = 0; 302 } else { 303 sregs->tstat = TSTAT_INIT_SEEQ; 304 } 305 306 hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc); 307 hregs->tx_ndptr = VIRT_TO_DMA(sp, sp->tx_desc); 308 309 seeq_go(sp, hregs, sregs); 310 return 0; 311 } 312 313 static void record_rx_errors(struct net_device *dev, unsigned char status) 314 { 315 if (status & SEEQ_RSTAT_OVERF || 316 status & SEEQ_RSTAT_SFRAME) 317 dev->stats.rx_over_errors++; 318 if (status & SEEQ_RSTAT_CERROR) 319 dev->stats.rx_crc_errors++; 320 if (status & SEEQ_RSTAT_DERROR) 321 dev->stats.rx_frame_errors++; 322 if (status & SEEQ_RSTAT_REOF) 323 dev->stats.rx_errors++; 324 } 325 326 static inline void rx_maybe_restart(struct sgiseeq_private *sp, 327 struct hpc3_ethregs *hregs, 328 struct sgiseeq_regs *sregs) 329 { 330 if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) { 331 hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc + sp->rx_new); 332 seeq_go(sp, hregs, sregs); 333 } 334 } 335 336 static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp, 337 struct hpc3_ethregs *hregs, 338 struct sgiseeq_regs *sregs) 339 { 340 struct sgiseeq_rx_desc *rd; 341 struct sk_buff *skb = NULL; 342 struct sk_buff *newskb; 343 unsigned char pkt_status; 344 int len = 0; 345 unsigned int orig_end = PREV_RX(sp->rx_new); 346 347 /* Service every received packet. */ 348 rd = &sp->rx_desc[sp->rx_new]; 349 dma_sync_desc_cpu(dev, rd); 350 while (!(rd->rdma.cntinfo & HPCDMA_OWN)) { 351 len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3; 352 dma_unmap_single(dev->dev.parent, rd->rdma.pbuf, 353 PKT_BUF_SZ, DMA_FROM_DEVICE); 354 pkt_status = rd->skb->data[len]; 355 if (pkt_status & SEEQ_RSTAT_FIG) { 356 /* Packet is OK. */ 357 /* We don't want to receive our own packets */ 358 if (!ether_addr_equal(rd->skb->data + 6, dev->dev_addr)) { 359 if (len > rx_copybreak) { 360 skb = rd->skb; 361 newskb = netdev_alloc_skb(dev, PKT_BUF_SZ); 362 if (!newskb) { 363 newskb = skb; 364 skb = NULL; 365 goto memory_squeeze; 366 } 367 skb_reserve(newskb, 2); 368 } else { 369 skb = netdev_alloc_skb_ip_align(dev, len); 370 if (skb) 371 skb_copy_to_linear_data(skb, rd->skb->data, len); 372 373 newskb = rd->skb; 374 } 375 memory_squeeze: 376 if (skb) { 377 skb_put(skb, len); 378 skb->protocol = eth_type_trans(skb, dev); 379 netif_rx(skb); 380 dev->stats.rx_packets++; 381 dev->stats.rx_bytes += len; 382 } else { 383 dev->stats.rx_dropped++; 384 } 385 } else { 386 /* Silently drop my own packets */ 387 newskb = rd->skb; 388 } 389 } else { 390 record_rx_errors(dev, pkt_status); 391 newskb = rd->skb; 392 } 393 rd->skb = newskb; 394 rd->rdma.pbuf = dma_map_single(dev->dev.parent, 395 newskb->data - 2, 396 PKT_BUF_SZ, DMA_FROM_DEVICE); 397 398 /* Return the entry to the ring pool. */ 399 rd->rdma.cntinfo = RCNTINFO_INIT; 400 sp->rx_new = NEXT_RX(sp->rx_new); 401 dma_sync_desc_dev(dev, rd); 402 rd = &sp->rx_desc[sp->rx_new]; 403 dma_sync_desc_cpu(dev, rd); 404 } 405 dma_sync_desc_cpu(dev, &sp->rx_desc[orig_end]); 406 sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR); 407 dma_sync_desc_dev(dev, &sp->rx_desc[orig_end]); 408 dma_sync_desc_cpu(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]); 409 sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR; 410 dma_sync_desc_dev(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]); 411 rx_maybe_restart(sp, hregs, sregs); 412 } 413 414 static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp, 415 struct sgiseeq_regs *sregs) 416 { 417 if (sp->is_edlc) { 418 sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT); 419 sregs->rw.wregs.control = sp->control; 420 } 421 } 422 423 static inline void kick_tx(struct net_device *dev, 424 struct sgiseeq_private *sp, 425 struct hpc3_ethregs *hregs) 426 { 427 struct sgiseeq_tx_desc *td; 428 int i = sp->tx_old; 429 430 /* If the HPC aint doin nothin, and there are more packets 431 * with ETXD cleared and XIU set we must make very certain 432 * that we restart the HPC else we risk locking up the 433 * adapter. The following code is only safe iff the HPCDMA 434 * is not active! 435 */ 436 td = &sp->tx_desc[i]; 437 dma_sync_desc_cpu(dev, td); 438 while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) == 439 (HPCDMA_XIU | HPCDMA_ETXD)) { 440 i = NEXT_TX(i); 441 td = &sp->tx_desc[i]; 442 dma_sync_desc_cpu(dev, td); 443 } 444 if (td->tdma.cntinfo & HPCDMA_XIU) { 445 hregs->tx_ndptr = VIRT_TO_DMA(sp, td); 446 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; 447 } 448 } 449 450 static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp, 451 struct hpc3_ethregs *hregs, 452 struct sgiseeq_regs *sregs) 453 { 454 struct sgiseeq_tx_desc *td; 455 unsigned long status = hregs->tx_ctrl; 456 int j; 457 458 tx_maybe_reset_collisions(sp, sregs); 459 460 if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) { 461 /* Oops, HPC detected some sort of error. */ 462 if (status & SEEQ_TSTAT_R16) 463 dev->stats.tx_aborted_errors++; 464 if (status & SEEQ_TSTAT_UFLOW) 465 dev->stats.tx_fifo_errors++; 466 if (status & SEEQ_TSTAT_LCLS) 467 dev->stats.collisions++; 468 } 469 470 /* Ack 'em... */ 471 for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) { 472 td = &sp->tx_desc[j]; 473 474 dma_sync_desc_cpu(dev, td); 475 if (!(td->tdma.cntinfo & (HPCDMA_XIU))) 476 break; 477 if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) { 478 if (!(status & HPC3_ETXCTRL_ACTIVE)) { 479 hregs->tx_ndptr = VIRT_TO_DMA(sp, td); 480 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; 481 } 482 break; 483 } 484 dev->stats.tx_packets++; 485 sp->tx_old = NEXT_TX(sp->tx_old); 486 td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE); 487 td->tdma.cntinfo |= HPCDMA_EOX; 488 if (td->skb) { 489 dev_kfree_skb_any(td->skb); 490 td->skb = NULL; 491 } 492 dma_sync_desc_dev(dev, td); 493 } 494 } 495 496 static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id) 497 { 498 struct net_device *dev = (struct net_device *) dev_id; 499 struct sgiseeq_private *sp = netdev_priv(dev); 500 struct hpc3_ethregs *hregs = sp->hregs; 501 struct sgiseeq_regs *sregs = sp->sregs; 502 503 spin_lock(&sp->tx_lock); 504 505 /* Ack the IRQ and set software state. */ 506 hregs->reset = HPC3_ERST_CLRIRQ; 507 508 /* Always check for received packets. */ 509 sgiseeq_rx(dev, sp, hregs, sregs); 510 511 /* Only check for tx acks if we have something queued. */ 512 if (sp->tx_old != sp->tx_new) 513 sgiseeq_tx(dev, sp, hregs, sregs); 514 515 if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) { 516 netif_wake_queue(dev); 517 } 518 spin_unlock(&sp->tx_lock); 519 520 return IRQ_HANDLED; 521 } 522 523 static int sgiseeq_open(struct net_device *dev) 524 { 525 struct sgiseeq_private *sp = netdev_priv(dev); 526 struct sgiseeq_regs *sregs = sp->sregs; 527 unsigned int irq = dev->irq; 528 int err; 529 530 if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) { 531 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq); 532 return -EAGAIN; 533 } 534 535 err = init_seeq(dev, sp, sregs); 536 if (err) 537 goto out_free_irq; 538 539 netif_start_queue(dev); 540 541 return 0; 542 543 out_free_irq: 544 free_irq(irq, dev); 545 546 return err; 547 } 548 549 static int sgiseeq_close(struct net_device *dev) 550 { 551 struct sgiseeq_private *sp = netdev_priv(dev); 552 struct sgiseeq_regs *sregs = sp->sregs; 553 unsigned int irq = dev->irq; 554 555 netif_stop_queue(dev); 556 557 /* Shutdown the Seeq. */ 558 reset_hpc3_and_seeq(sp->hregs, sregs); 559 free_irq(irq, dev); 560 seeq_purge_ring(dev); 561 562 return 0; 563 } 564 565 static inline int sgiseeq_reset(struct net_device *dev) 566 { 567 struct sgiseeq_private *sp = netdev_priv(dev); 568 struct sgiseeq_regs *sregs = sp->sregs; 569 int err; 570 571 err = init_seeq(dev, sp, sregs); 572 if (err) 573 return err; 574 575 dev->trans_start = jiffies; /* prevent tx timeout */ 576 netif_wake_queue(dev); 577 578 return 0; 579 } 580 581 static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev) 582 { 583 struct sgiseeq_private *sp = netdev_priv(dev); 584 struct hpc3_ethregs *hregs = sp->hregs; 585 unsigned long flags; 586 struct sgiseeq_tx_desc *td; 587 int len, entry; 588 589 spin_lock_irqsave(&sp->tx_lock, flags); 590 591 /* Setup... */ 592 len = skb->len; 593 if (len < ETH_ZLEN) { 594 if (skb_padto(skb, ETH_ZLEN)) { 595 spin_unlock_irqrestore(&sp->tx_lock, flags); 596 return NETDEV_TX_OK; 597 } 598 len = ETH_ZLEN; 599 } 600 601 dev->stats.tx_bytes += len; 602 entry = sp->tx_new; 603 td = &sp->tx_desc[entry]; 604 dma_sync_desc_cpu(dev, td); 605 606 /* Create entry. There are so many races with adding a new 607 * descriptor to the chain: 608 * 1) Assume that the HPC is off processing a DMA chain while 609 * we are changing all of the following. 610 * 2) Do no allow the HPC to look at a new descriptor until 611 * we have completely set up it's state. This means, do 612 * not clear HPCDMA_EOX in the current last descritptor 613 * until the one we are adding looks consistent and could 614 * be processes right now. 615 * 3) The tx interrupt code must notice when we've added a new 616 * entry and the HPC got to the end of the chain before we 617 * added this new entry and restarted it. 618 */ 619 td->skb = skb; 620 td->tdma.pbuf = dma_map_single(dev->dev.parent, skb->data, 621 len, DMA_TO_DEVICE); 622 td->tdma.cntinfo = (len & HPCDMA_BCNT) | 623 HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX; 624 dma_sync_desc_dev(dev, td); 625 if (sp->tx_old != sp->tx_new) { 626 struct sgiseeq_tx_desc *backend; 627 628 backend = &sp->tx_desc[PREV_TX(sp->tx_new)]; 629 dma_sync_desc_cpu(dev, backend); 630 backend->tdma.cntinfo &= ~HPCDMA_EOX; 631 dma_sync_desc_dev(dev, backend); 632 } 633 sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */ 634 635 /* Maybe kick the HPC back into motion. */ 636 if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE)) 637 kick_tx(dev, sp, hregs); 638 639 if (!TX_BUFFS_AVAIL(sp)) 640 netif_stop_queue(dev); 641 spin_unlock_irqrestore(&sp->tx_lock, flags); 642 643 return NETDEV_TX_OK; 644 } 645 646 static void timeout(struct net_device *dev) 647 { 648 printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name); 649 sgiseeq_reset(dev); 650 651 dev->trans_start = jiffies; /* prevent tx timeout */ 652 netif_wake_queue(dev); 653 } 654 655 static void sgiseeq_set_multicast(struct net_device *dev) 656 { 657 struct sgiseeq_private *sp = netdev_priv(dev); 658 unsigned char oldmode = sp->mode; 659 660 if(dev->flags & IFF_PROMISC) 661 sp->mode = SEEQ_RCMD_RANY; 662 else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev)) 663 sp->mode = SEEQ_RCMD_RBMCAST; 664 else 665 sp->mode = SEEQ_RCMD_RBCAST; 666 667 /* XXX I know this sucks, but is there a better way to reprogram 668 * XXX the receiver? At least, this shouldn't happen too often. 669 */ 670 671 if (oldmode != sp->mode) 672 sgiseeq_reset(dev); 673 } 674 675 static inline void setup_tx_ring(struct net_device *dev, 676 struct sgiseeq_tx_desc *buf, 677 int nbufs) 678 { 679 struct sgiseeq_private *sp = netdev_priv(dev); 680 int i = 0; 681 682 while (i < (nbufs - 1)) { 683 buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf + i + 1); 684 buf[i].tdma.pbuf = 0; 685 dma_sync_desc_dev(dev, &buf[i]); 686 i++; 687 } 688 buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf); 689 dma_sync_desc_dev(dev, &buf[i]); 690 } 691 692 static inline void setup_rx_ring(struct net_device *dev, 693 struct sgiseeq_rx_desc *buf, 694 int nbufs) 695 { 696 struct sgiseeq_private *sp = netdev_priv(dev); 697 int i = 0; 698 699 while (i < (nbufs - 1)) { 700 buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf + i + 1); 701 buf[i].rdma.pbuf = 0; 702 dma_sync_desc_dev(dev, &buf[i]); 703 i++; 704 } 705 buf[i].rdma.pbuf = 0; 706 buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf); 707 dma_sync_desc_dev(dev, &buf[i]); 708 } 709 710 static const struct net_device_ops sgiseeq_netdev_ops = { 711 .ndo_open = sgiseeq_open, 712 .ndo_stop = sgiseeq_close, 713 .ndo_start_xmit = sgiseeq_start_xmit, 714 .ndo_tx_timeout = timeout, 715 .ndo_set_rx_mode = sgiseeq_set_multicast, 716 .ndo_set_mac_address = sgiseeq_set_mac_address, 717 .ndo_change_mtu = eth_change_mtu, 718 .ndo_validate_addr = eth_validate_addr, 719 }; 720 721 static int sgiseeq_probe(struct platform_device *pdev) 722 { 723 struct sgiseeq_platform_data *pd = dev_get_platdata(&pdev->dev); 724 struct hpc3_regs *hpcregs = pd->hpc; 725 struct sgiseeq_init_block *sr; 726 unsigned int irq = pd->irq; 727 struct sgiseeq_private *sp; 728 struct net_device *dev; 729 int err; 730 731 dev = alloc_etherdev(sizeof (struct sgiseeq_private)); 732 if (!dev) { 733 err = -ENOMEM; 734 goto err_out; 735 } 736 737 platform_set_drvdata(pdev, dev); 738 sp = netdev_priv(dev); 739 740 /* Make private data page aligned */ 741 sr = dma_alloc_noncoherent(&pdev->dev, sizeof(*sp->srings), 742 &sp->srings_dma, GFP_KERNEL); 743 if (!sr) { 744 printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n"); 745 err = -ENOMEM; 746 goto err_out_free_dev; 747 } 748 sp->srings = sr; 749 sp->rx_desc = sp->srings->rxvector; 750 sp->tx_desc = sp->srings->txvector; 751 spin_lock_init(&sp->tx_lock); 752 753 /* A couple calculations now, saves many cycles later. */ 754 setup_rx_ring(dev, sp->rx_desc, SEEQ_RX_BUFFERS); 755 setup_tx_ring(dev, sp->tx_desc, SEEQ_TX_BUFFERS); 756 757 memcpy(dev->dev_addr, pd->mac, ETH_ALEN); 758 759 #ifdef DEBUG 760 gpriv = sp; 761 gdev = dev; 762 #endif 763 sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0]; 764 sp->hregs = &hpcregs->ethregs; 765 sp->name = sgiseeqstr; 766 sp->mode = SEEQ_RCMD_RBCAST; 767 768 /* Setup PIO and DMA transfer timing */ 769 sp->hregs->pconfig = 0x161; 770 sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP | 771 HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026; 772 773 /* Setup PIO and DMA transfer timing */ 774 sp->hregs->pconfig = 0x161; 775 sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP | 776 HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026; 777 778 /* Reset the chip. */ 779 hpc3_eth_reset(sp->hregs); 780 781 sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff); 782 if (sp->is_edlc) 783 sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT | 784 SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT | 785 SEEQ_CTRL_ENCARR; 786 787 dev->netdev_ops = &sgiseeq_netdev_ops; 788 dev->watchdog_timeo = (200 * HZ) / 1000; 789 dev->irq = irq; 790 791 if (register_netdev(dev)) { 792 printk(KERN_ERR "Sgiseeq: Cannot register net device, " 793 "aborting.\n"); 794 err = -ENODEV; 795 goto err_out_free_page; 796 } 797 798 printk(KERN_INFO "%s: %s %pM\n", dev->name, sgiseeqstr, dev->dev_addr); 799 800 return 0; 801 802 err_out_free_page: 803 free_page((unsigned long) sp->srings); 804 err_out_free_dev: 805 free_netdev(dev); 806 807 err_out: 808 return err; 809 } 810 811 static int __exit sgiseeq_remove(struct platform_device *pdev) 812 { 813 struct net_device *dev = platform_get_drvdata(pdev); 814 struct sgiseeq_private *sp = netdev_priv(dev); 815 816 unregister_netdev(dev); 817 dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings, 818 sp->srings_dma); 819 free_netdev(dev); 820 821 return 0; 822 } 823 824 static struct platform_driver sgiseeq_driver = { 825 .probe = sgiseeq_probe, 826 .remove = __exit_p(sgiseeq_remove), 827 .driver = { 828 .name = "sgiseeq", 829 } 830 }; 831 832 module_platform_driver(sgiseeq_driver); 833 834 MODULE_DESCRIPTION("SGI Seeq 8003 driver"); 835 MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>"); 836 MODULE_LICENSE("GPL"); 837 MODULE_ALIAS("platform:sgiseeq"); 838