1/* 2 * sgiseeq.c: Seeq8003 ethernet driver for SGI machines. 3 * 4 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com) 5 */ 6 7#undef DEBUG 8 9#include <linux/kernel.h> 10#include <linux/module.h> 11#include <linux/errno.h> 12#include <linux/init.h> 13#include <linux/types.h> 14#include <linux/interrupt.h> 15#include <linux/slab.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 29static 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 * layed 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 56struct sgiseeq_rx_desc { 57 volatile struct hpc_dma_desc rdma; 58 volatile signed int buf_vaddr; 59}; 60 61struct sgiseeq_tx_desc { 62 volatile struct hpc_dma_desc tdma; 63 volatile signed int buf_vaddr; 64}; 65 66/* 67 * Warning: This structure is layed out in a certain way because HPC dma 68 * descriptors must be 8-byte aligned. So don't touch this without 69 * some care. 70 */ 71struct sgiseeq_init_block { /* Note the name ;-) */ 72 struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS]; 73 struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS]; 74}; 75 76struct sgiseeq_private { 77 struct sgiseeq_init_block *srings; 78 79 /* Ptrs to the descriptors in uncached space. */ 80 struct sgiseeq_rx_desc *rx_desc; 81 struct sgiseeq_tx_desc *tx_desc; 82 83 char *name; 84 struct hpc3_ethregs *hregs; 85 struct sgiseeq_regs *sregs; 86 87 /* Ring entry counters. */ 88 unsigned int rx_new, tx_new; 89 unsigned int rx_old, tx_old; 90 91 int is_edlc; 92 unsigned char control; 93 unsigned char mode; 94 95 struct net_device_stats stats; 96 97 spinlock_t tx_lock; 98}; 99 100static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs) 101{ 102 hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ; 103 udelay(20); 104 hregs->reset = 0; 105} 106 107static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs, 108 struct sgiseeq_regs *sregs) 109{ 110 hregs->rx_ctrl = hregs->tx_ctrl = 0; 111 hpc3_eth_reset(hregs); 112} 113 114#define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \ 115 SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC) 116 117static inline void seeq_go(struct sgiseeq_private *sp, 118 struct hpc3_ethregs *hregs, 119 struct sgiseeq_regs *sregs) 120{ 121 sregs->rstat = sp->mode | RSTAT_GO_BITS; 122 hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE; 123} 124 125static inline void __sgiseeq_set_mac_address(struct net_device *dev) 126{ 127 struct sgiseeq_private *sp = netdev_priv(dev); 128 struct sgiseeq_regs *sregs = sp->sregs; 129 int i; 130 131 sregs->tstat = SEEQ_TCMD_RB0; 132 for (i = 0; i < 6; i++) 133 sregs->rw.eth_addr[i] = dev->dev_addr[i]; 134} 135 136static int sgiseeq_set_mac_address(struct net_device *dev, void *addr) 137{ 138 struct sgiseeq_private *sp = netdev_priv(dev); 139 struct sockaddr *sa = addr; 140 141 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 142 143 spin_lock_irq(&sp->tx_lock); 144 __sgiseeq_set_mac_address(dev); 145 spin_unlock_irq(&sp->tx_lock); 146 147 return 0; 148} 149 150#define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD) 151#define RCNTCFG_INIT (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE) 152#define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT)) 153 154static int seeq_init_ring(struct net_device *dev) 155{ 156 struct sgiseeq_private *sp = netdev_priv(dev); 157 int i; 158 159 netif_stop_queue(dev); 160 sp->rx_new = sp->tx_new = 0; 161 sp->rx_old = sp->tx_old = 0; 162 163 __sgiseeq_set_mac_address(dev); 164 165 /* Setup tx ring. */ 166 for(i = 0; i < SEEQ_TX_BUFFERS; i++) { 167 if (!sp->tx_desc[i].tdma.pbuf) { 168 unsigned long buffer; 169 170 buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL); 171 if (!buffer) 172 return -ENOMEM; 173 sp->tx_desc[i].buf_vaddr = CKSEG1ADDR(buffer); 174 sp->tx_desc[i].tdma.pbuf = CPHYSADDR(buffer); 175 } 176 sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT; 177 } 178 179 /* And now the rx ring. */ 180 for (i = 0; i < SEEQ_RX_BUFFERS; i++) { 181 if (!sp->rx_desc[i].rdma.pbuf) { 182 unsigned long buffer; 183 184 buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL); 185 if (!buffer) 186 return -ENOMEM; 187 sp->rx_desc[i].buf_vaddr = CKSEG1ADDR(buffer); 188 sp->rx_desc[i].rdma.pbuf = CPHYSADDR(buffer); 189 } 190 sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT; 191 } 192 sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR; 193 return 0; 194} 195 196#ifdef DEBUG 197static struct sgiseeq_private *gpriv; 198static struct net_device *gdev; 199 200static void sgiseeq_dump_rings(void) 201{ 202 static int once; 203 struct sgiseeq_rx_desc *r = gpriv->rx_desc; 204 struct sgiseeq_tx_desc *t = gpriv->tx_desc; 205 struct hpc3_ethregs *hregs = gpriv->hregs; 206 int i; 207 208 if (once) 209 return; 210 once++; 211 printk("RING DUMP:\n"); 212 for (i = 0; i < SEEQ_RX_BUFFERS; i++) { 213 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ", 214 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo, 215 r[i].rdma.pnext); 216 i += 1; 217 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n", 218 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo, 219 r[i].rdma.pnext); 220 } 221 for (i = 0; i < SEEQ_TX_BUFFERS; i++) { 222 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ", 223 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo, 224 t[i].tdma.pnext); 225 i += 1; 226 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n", 227 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo, 228 t[i].tdma.pnext); 229 } 230 printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n", 231 gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old); 232 printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n", 233 hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl); 234 printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n", 235 hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl); 236} 237#endif 238 239#define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF) 240#define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2) 241 242static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp, 243 struct sgiseeq_regs *sregs) 244{ 245 struct hpc3_ethregs *hregs = sp->hregs; 246 int err; 247 248 reset_hpc3_and_seeq(hregs, sregs); 249 err = seeq_init_ring(dev); 250 if (err) 251 return err; 252 253 /* Setup to field the proper interrupt types. */ 254 if (sp->is_edlc) { 255 sregs->tstat = TSTAT_INIT_EDLC; 256 sregs->rw.wregs.control = sp->control; 257 sregs->rw.wregs.frame_gap = 0; 258 } else { 259 sregs->tstat = TSTAT_INIT_SEEQ; 260 } 261 262 hregs->rx_ndptr = CPHYSADDR(sp->rx_desc); 263 hregs->tx_ndptr = CPHYSADDR(sp->tx_desc); 264 265 seeq_go(sp, hregs, sregs); 266 return 0; 267} 268 269static inline void record_rx_errors(struct sgiseeq_private *sp, 270 unsigned char status) 271{ 272 if (status & SEEQ_RSTAT_OVERF || 273 status & SEEQ_RSTAT_SFRAME) 274 sp->stats.rx_over_errors++; 275 if (status & SEEQ_RSTAT_CERROR) 276 sp->stats.rx_crc_errors++; 277 if (status & SEEQ_RSTAT_DERROR) 278 sp->stats.rx_frame_errors++; 279 if (status & SEEQ_RSTAT_REOF) 280 sp->stats.rx_errors++; 281} 282 283static inline void rx_maybe_restart(struct sgiseeq_private *sp, 284 struct hpc3_ethregs *hregs, 285 struct sgiseeq_regs *sregs) 286{ 287 if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) { 288 hregs->rx_ndptr = CPHYSADDR(sp->rx_desc + sp->rx_new); 289 seeq_go(sp, hregs, sregs); 290 } 291} 292 293#define for_each_rx(rd, sp) for((rd) = &(sp)->rx_desc[(sp)->rx_new]; \ 294 !((rd)->rdma.cntinfo & HPCDMA_OWN); \ 295 (rd) = &(sp)->rx_desc[(sp)->rx_new]) 296 297static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp, 298 struct hpc3_ethregs *hregs, 299 struct sgiseeq_regs *sregs) 300{ 301 struct sgiseeq_rx_desc *rd; 302 struct sk_buff *skb = NULL; 303 unsigned char pkt_status; 304 unsigned char *pkt_pointer = NULL; 305 int len = 0; 306 unsigned int orig_end = PREV_RX(sp->rx_new); 307 308 /* Service every received packet. */ 309 for_each_rx(rd, sp) { 310 len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3; 311 pkt_pointer = (unsigned char *)(long)rd->buf_vaddr; 312 pkt_status = pkt_pointer[len + 2]; 313 314 if (pkt_status & SEEQ_RSTAT_FIG) { 315 /* Packet is OK. */ 316 skb = dev_alloc_skb(len + 2); 317 318 if (skb) { 319 skb_reserve(skb, 2); 320 skb_put(skb, len); 321 322 /* Copy out of kseg1 to avoid silly cache flush. */ 323 eth_copy_and_sum(skb, pkt_pointer + 2, len, 0); 324 skb->protocol = eth_type_trans(skb, dev); 325 326 /* We don't want to receive our own packets */ 327 if (memcmp(eth_hdr(skb)->h_source, dev->dev_addr, ETH_ALEN)) { 328 netif_rx(skb); 329 dev->last_rx = jiffies; 330 sp->stats.rx_packets++; 331 sp->stats.rx_bytes += len; 332 } else { 333 /* Silently drop my own packets */ 334 dev_kfree_skb_irq(skb); 335 } 336 } else { 337 printk (KERN_NOTICE "%s: Memory squeeze, deferring packet.\n", 338 dev->name); 339 sp->stats.rx_dropped++; 340 } 341 } else { 342 record_rx_errors(sp, pkt_status); 343 } 344 345 /* Return the entry to the ring pool. */ 346 rd->rdma.cntinfo = RCNTINFO_INIT; 347 sp->rx_new = NEXT_RX(sp->rx_new); 348 } 349 sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR); 350 sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR; 351 rx_maybe_restart(sp, hregs, sregs); 352} 353 354static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp, 355 struct sgiseeq_regs *sregs) 356{ 357 if (sp->is_edlc) { 358 sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT); 359 sregs->rw.wregs.control = sp->control; 360 } 361} 362 363static inline void kick_tx(struct sgiseeq_tx_desc *td, 364 struct hpc3_ethregs *hregs) 365{ 366 /* If the HPC aint doin nothin, and there are more packets 367 * with ETXD cleared and XIU set we must make very certain 368 * that we restart the HPC else we risk locking up the 369 * adapter. The following code is only safe iff the HPCDMA 370 * is not active! 371 */ 372 while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) == 373 (HPCDMA_XIU | HPCDMA_ETXD)) 374 td = (struct sgiseeq_tx_desc *)(long) CKSEG1ADDR(td->tdma.pnext); 375 if (td->tdma.cntinfo & HPCDMA_XIU) { 376 hregs->tx_ndptr = CPHYSADDR(td); 377 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; 378 } 379} 380 381static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp, 382 struct hpc3_ethregs *hregs, 383 struct sgiseeq_regs *sregs) 384{ 385 struct sgiseeq_tx_desc *td; 386 unsigned long status = hregs->tx_ctrl; 387 int j; 388 389 tx_maybe_reset_collisions(sp, sregs); 390 391 if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) { 392 /* Oops, HPC detected some sort of error. */ 393 if (status & SEEQ_TSTAT_R16) 394 sp->stats.tx_aborted_errors++; 395 if (status & SEEQ_TSTAT_UFLOW) 396 sp->stats.tx_fifo_errors++; 397 if (status & SEEQ_TSTAT_LCLS) 398 sp->stats.collisions++; 399 } 400 401 /* Ack 'em... */ 402 for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) { 403 td = &sp->tx_desc[j]; 404 405 if (!(td->tdma.cntinfo & (HPCDMA_XIU))) 406 break; 407 if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) { 408 if (!(status & HPC3_ETXCTRL_ACTIVE)) { 409 hregs->tx_ndptr = CPHYSADDR(td); 410 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; 411 } 412 break; 413 } 414 sp->stats.tx_packets++; 415 sp->tx_old = NEXT_TX(sp->tx_old); 416 td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE); 417 td->tdma.cntinfo |= HPCDMA_EOX; 418 } 419} 420 421static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id) 422{ 423 struct net_device *dev = (struct net_device *) dev_id; 424 struct sgiseeq_private *sp = netdev_priv(dev); 425 struct hpc3_ethregs *hregs = sp->hregs; 426 struct sgiseeq_regs *sregs = sp->sregs; 427 428 spin_lock(&sp->tx_lock); 429 430 /* Ack the IRQ and set software state. */ 431 hregs->reset = HPC3_ERST_CLRIRQ; 432 433 /* Always check for received packets. */ 434 sgiseeq_rx(dev, sp, hregs, sregs); 435 436 /* Only check for tx acks if we have something queued. */ 437 if (sp->tx_old != sp->tx_new) 438 sgiseeq_tx(dev, sp, hregs, sregs); 439 440 if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) { 441 netif_wake_queue(dev); 442 } 443 spin_unlock(&sp->tx_lock); 444 445 return IRQ_HANDLED; 446} 447 448static int sgiseeq_open(struct net_device *dev) 449{ 450 struct sgiseeq_private *sp = netdev_priv(dev); 451 struct sgiseeq_regs *sregs = sp->sregs; 452 unsigned int irq = dev->irq; 453 int err; 454 455 if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) { 456 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq); 457 err = -EAGAIN; 458 } 459 460 err = init_seeq(dev, sp, sregs); 461 if (err) 462 goto out_free_irq; 463 464 netif_start_queue(dev); 465 466 return 0; 467 468out_free_irq: 469 free_irq(irq, dev); 470 471 return err; 472} 473 474static int sgiseeq_close(struct net_device *dev) 475{ 476 struct sgiseeq_private *sp = netdev_priv(dev); 477 struct sgiseeq_regs *sregs = sp->sregs; 478 unsigned int irq = dev->irq; 479 480 netif_stop_queue(dev); 481 482 /* Shutdown the Seeq. */ 483 reset_hpc3_and_seeq(sp->hregs, sregs); 484 free_irq(irq, dev); 485 486 return 0; 487} 488 489static inline int sgiseeq_reset(struct net_device *dev) 490{ 491 struct sgiseeq_private *sp = netdev_priv(dev); 492 struct sgiseeq_regs *sregs = sp->sregs; 493 int err; 494 495 err = init_seeq(dev, sp, sregs); 496 if (err) 497 return err; 498 499 dev->trans_start = jiffies; 500 netif_wake_queue(dev); 501 502 return 0; 503} 504 505static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev) 506{ 507 struct sgiseeq_private *sp = netdev_priv(dev); 508 struct hpc3_ethregs *hregs = sp->hregs; 509 unsigned long flags; 510 struct sgiseeq_tx_desc *td; 511 int skblen, len, entry; 512 513 spin_lock_irqsave(&sp->tx_lock, flags); 514 515 /* Setup... */ 516 skblen = skb->len; 517 len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen; 518 sp->stats.tx_bytes += len; 519 entry = sp->tx_new; 520 td = &sp->tx_desc[entry]; 521 522 /* Create entry. There are so many races with adding a new 523 * descriptor to the chain: 524 * 1) Assume that the HPC is off processing a DMA chain while 525 * we are changing all of the following. 526 * 2) Do no allow the HPC to look at a new descriptor until 527 * we have completely set up it's state. This means, do 528 * not clear HPCDMA_EOX in the current last descritptor 529 * until the one we are adding looks consistent and could 530 * be processes right now. 531 * 3) The tx interrupt code must notice when we've added a new 532 * entry and the HPC got to the end of the chain before we 533 * added this new entry and restarted it. 534 */ 535 skb_copy_from_linear_data(skb, (char *)(long)td->buf_vaddr, skblen); 536 if (len != skblen) 537 memset((char *)(long)td->buf_vaddr + skb->len, 0, len-skblen); 538 td->tdma.cntinfo = (len & HPCDMA_BCNT) | 539 HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX; 540 if (sp->tx_old != sp->tx_new) { 541 struct sgiseeq_tx_desc *backend; 542 543 backend = &sp->tx_desc[PREV_TX(sp->tx_new)]; 544 backend->tdma.cntinfo &= ~HPCDMA_EOX; 545 } 546 sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */ 547 548 /* Maybe kick the HPC back into motion. */ 549 if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE)) 550 kick_tx(&sp->tx_desc[sp->tx_old], hregs); 551 552 dev->trans_start = jiffies; 553 dev_kfree_skb(skb); 554 555 if (!TX_BUFFS_AVAIL(sp)) 556 netif_stop_queue(dev); 557 spin_unlock_irqrestore(&sp->tx_lock, flags); 558 559 return 0; 560} 561 562static void timeout(struct net_device *dev) 563{ 564 printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name); 565 sgiseeq_reset(dev); 566 567 dev->trans_start = jiffies; 568 netif_wake_queue(dev); 569} 570 571static struct net_device_stats *sgiseeq_get_stats(struct net_device *dev) 572{ 573 struct sgiseeq_private *sp = netdev_priv(dev); 574 575 return &sp->stats; 576} 577 578static void sgiseeq_set_multicast(struct net_device *dev) 579{ 580 struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv; 581 unsigned char oldmode = sp->mode; 582 583 if(dev->flags & IFF_PROMISC) 584 sp->mode = SEEQ_RCMD_RANY; 585 else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count) 586 sp->mode = SEEQ_RCMD_RBMCAST; 587 else 588 sp->mode = SEEQ_RCMD_RBCAST; 589 590 591 if (oldmode != sp->mode) 592 sgiseeq_reset(dev); 593} 594 595static inline void setup_tx_ring(struct sgiseeq_tx_desc *buf, int nbufs) 596{ 597 int i = 0; 598 599 while (i < (nbufs - 1)) { 600 buf[i].tdma.pnext = CPHYSADDR(buf + i + 1); 601 buf[i].tdma.pbuf = 0; 602 i++; 603 } 604 buf[i].tdma.pnext = CPHYSADDR(buf); 605} 606 607static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs) 608{ 609 int i = 0; 610 611 while (i < (nbufs - 1)) { 612 buf[i].rdma.pnext = CPHYSADDR(buf + i + 1); 613 buf[i].rdma.pbuf = 0; 614 i++; 615 } 616 buf[i].rdma.pbuf = 0; 617 buf[i].rdma.pnext = CPHYSADDR(buf); 618} 619 620#define ALIGNED(x) ((((unsigned long)(x)) + 0xf) & ~(0xf)) 621 622static int __init sgiseeq_probe(struct platform_device *pdev) 623{ 624 struct sgiseeq_platform_data *pd = pdev->dev.platform_data; 625 struct hpc3_regs *hpcregs = pd->hpc; 626 struct sgiseeq_init_block *sr; 627 unsigned int irq = pd->irq; 628 struct sgiseeq_private *sp; 629 struct net_device *dev; 630 int err, i; 631 632 dev = alloc_etherdev(sizeof (struct sgiseeq_private)); 633 if (!dev) { 634 printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n"); 635 err = -ENOMEM; 636 goto err_out; 637 } 638 639 platform_set_drvdata(pdev, dev); 640 sp = netdev_priv(dev); 641 642 /* Make private data page aligned */ 643 sr = (struct sgiseeq_init_block *) get_zeroed_page(GFP_KERNEL); 644 if (!sr) { 645 printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n"); 646 err = -ENOMEM; 647 goto err_out_free_dev; 648 } 649 sp->srings = sr; 650 651 memcpy(dev->dev_addr, pd->mac, ETH_ALEN); 652 653#ifdef DEBUG 654 gpriv = sp; 655 gdev = dev; 656#endif 657 sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0]; 658 sp->hregs = &hpcregs->ethregs; 659 sp->name = sgiseeqstr; 660 sp->mode = SEEQ_RCMD_RBCAST; 661 662 sp->rx_desc = (struct sgiseeq_rx_desc *) 663 CKSEG1ADDR(ALIGNED(&sp->srings->rxvector[0])); 664 dma_cache_wback_inv((unsigned long)&sp->srings->rxvector, 665 sizeof(sp->srings->rxvector)); 666 sp->tx_desc = (struct sgiseeq_tx_desc *) 667 CKSEG1ADDR(ALIGNED(&sp->srings->txvector[0])); 668 dma_cache_wback_inv((unsigned long)&sp->srings->txvector, 669 sizeof(sp->srings->txvector)); 670 671 /* A couple calculations now, saves many cycles later. */ 672 setup_rx_ring(sp->rx_desc, SEEQ_RX_BUFFERS); 673 setup_tx_ring(sp->tx_desc, SEEQ_TX_BUFFERS); 674 675 /* Setup PIO and DMA transfer timing */ 676 sp->hregs->pconfig = 0x161; 677 sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP | 678 HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026; 679 680 /* Setup PIO and DMA transfer timing */ 681 sp->hregs->pconfig = 0x161; 682 sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP | 683 HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026; 684 685 /* Reset the chip. */ 686 hpc3_eth_reset(sp->hregs); 687 688 sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff); 689 if (sp->is_edlc) 690 sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT | 691 SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT | 692 SEEQ_CTRL_ENCARR; 693 694 dev->open = sgiseeq_open; 695 dev->stop = sgiseeq_close; 696 dev->hard_start_xmit = sgiseeq_start_xmit; 697 dev->tx_timeout = timeout; 698 dev->watchdog_timeo = (200 * HZ) / 1000; 699 dev->get_stats = sgiseeq_get_stats; 700 dev->set_multicast_list = sgiseeq_set_multicast; 701 dev->set_mac_address = sgiseeq_set_mac_address; 702 dev->irq = irq; 703 704 if (register_netdev(dev)) { 705 printk(KERN_ERR "Sgiseeq: Cannot register net device, " 706 "aborting.\n"); 707 err = -ENODEV; 708 goto err_out_free_page; 709 } 710 711 printk(KERN_INFO "%s: %s ", dev->name, sgiseeqstr); 712 for (i = 0; i < 6; i++) 713 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':'); 714 715 return 0; 716 717err_out_free_page: 718 free_page((unsigned long) sp->srings); 719err_out_free_dev: 720 kfree(dev); 721 722err_out: 723 return err; 724} 725 726static void __exit sgiseeq_remove(struct platform_device *pdev) 727{ 728 struct net_device *dev = platform_get_drvdata(pdev); 729 struct sgiseeq_private *sp = netdev_priv(dev); 730 731 unregister_netdev(dev); 732 free_page((unsigned long) sp->srings); 733 free_netdev(dev); 734 platform_set_drvdata(pdev, NULL); 735} 736 737static struct platform_driver sgiseeq_driver = { 738 .probe = sgiseeq_probe, 739 .remove = __devexit_p(sgiseeq_remove), 740 .driver = { 741 .name = "sgiseeq" 742 } 743}; 744 745static int __init sgiseeq_module_init(void) 746{ 747 if (platform_driver_register(&sgiseeq_driver)) { 748 printk(KERN_ERR "Driver registration failed\n"); 749 return -ENODEV; 750 } 751 752 return 0; 753} 754 755static void __exit sgiseeq_module_exit(void) 756{ 757 platform_driver_unregister(&sgiseeq_driver); 758} 759 760module_init(sgiseeq_module_init); 761module_exit(sgiseeq_module_exit); 762 763MODULE_DESCRIPTION("SGI Seeq 8003 driver"); 764MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>"); 765MODULE_LICENSE("GPL"); 766