1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * sgiseeq.c: Seeq8003 ethernet driver for SGI machines. 4 * 5 * Copyright (C) 1996 David S. Miller (davem@davemloft.net) 6 */ 7 8 #undef DEBUG 9 10 #include <linux/dma-mapping.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/slab.h> 14 #include <linux/errno.h> 15 #include <linux/types.h> 16 #include <linux/interrupt.h> 17 #include <linux/string.h> 18 #include <linux/delay.h> 19 #include <linux/netdevice.h> 20 #include <linux/platform_device.h> 21 #include <linux/etherdevice.h> 22 #include <linux/skbuff.h> 23 24 #include <asm/sgi/hpc3.h> 25 #include <asm/sgi/ip22.h> 26 #include <asm/sgi/seeq.h> 27 28 #include "sgiseeq.h" 29 30 static char *sgiseeqstr = "SGI Seeq8003"; 31 32 /* 33 * If you want speed, you do something silly, it always has worked for me. So, 34 * with that in mind, I've decided to make this driver look completely like a 35 * stupid Lance from a driver architecture perspective. Only difference is that 36 * here our "ring buffer" looks and acts like a real Lance one does but is 37 * laid out like how the HPC DMA and the Seeq want it to. You'd be surprised 38 * how a stupid idea like this can pay off in performance, not to mention 39 * making this driver 2,000 times easier to write. ;-) 40 */ 41 42 /* Tune these if we tend to run out often etc. */ 43 #define SEEQ_RX_BUFFERS 16 44 #define SEEQ_TX_BUFFERS 16 45 46 #define PKT_BUF_SZ 1584 47 48 #define NEXT_RX(i) (((i) + 1) & (SEEQ_RX_BUFFERS - 1)) 49 #define NEXT_TX(i) (((i) + 1) & (SEEQ_TX_BUFFERS - 1)) 50 #define PREV_RX(i) (((i) - 1) & (SEEQ_RX_BUFFERS - 1)) 51 #define PREV_TX(i) (((i) - 1) & (SEEQ_TX_BUFFERS - 1)) 52 53 #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \ 54 sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \ 55 sp->tx_old - sp->tx_new - 1) 56 57 #define VIRT_TO_DMA(sp, v) ((sp)->srings_dma + \ 58 (dma_addr_t)((unsigned long)(v) - \ 59 (unsigned long)((sp)->rx_desc))) 60 61 /* Copy frames shorter than rx_copybreak, otherwise pass on up in 62 * a full sized sk_buff. Value of 100 stolen from tulip.c (!alpha). 63 */ 64 static int rx_copybreak = 100; 65 66 #define PAD_SIZE (128 - sizeof(struct hpc_dma_desc) - sizeof(void *)) 67 68 struct sgiseeq_rx_desc { 69 volatile struct hpc_dma_desc rdma; 70 u8 padding[PAD_SIZE]; 71 struct sk_buff *skb; 72 }; 73 74 struct sgiseeq_tx_desc { 75 volatile struct hpc_dma_desc tdma; 76 u8 padding[PAD_SIZE]; 77 struct sk_buff *skb; 78 }; 79 80 /* 81 * Warning: This structure is laid out in a certain way because HPC dma 82 * descriptors must be 8-byte aligned. So don't touch this without 83 * some care. 84 */ 85 struct sgiseeq_init_block { /* Note the name ;-) */ 86 struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS]; 87 struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS]; 88 }; 89 90 struct sgiseeq_private { 91 struct sgiseeq_init_block *srings; 92 dma_addr_t srings_dma; 93 94 /* Ptrs to the descriptors in uncached space. */ 95 struct sgiseeq_rx_desc *rx_desc; 96 struct sgiseeq_tx_desc *tx_desc; 97 98 char *name; 99 struct hpc3_ethregs *hregs; 100 struct sgiseeq_regs *sregs; 101 102 /* Ring entry counters. */ 103 unsigned int rx_new, tx_new; 104 unsigned int rx_old, tx_old; 105 106 int is_edlc; 107 unsigned char control; 108 unsigned char mode; 109 110 spinlock_t tx_lock; 111 }; 112 113 static inline void dma_sync_desc_cpu(struct net_device *dev, void *addr) 114 { 115 struct sgiseeq_private *sp = netdev_priv(dev); 116 117 dma_sync_single_for_cpu(dev->dev.parent, VIRT_TO_DMA(sp, addr), 118 sizeof(struct sgiseeq_rx_desc), DMA_BIDIRECTIONAL); 119 } 120 121 static inline void dma_sync_desc_dev(struct net_device *dev, void *addr) 122 { 123 struct sgiseeq_private *sp = netdev_priv(dev); 124 125 dma_sync_single_for_device(dev->dev.parent, VIRT_TO_DMA(sp, addr), 126 sizeof(struct sgiseeq_rx_desc), DMA_BIDIRECTIONAL); 127 } 128 129 static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs) 130 { 131 hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ; 132 udelay(20); 133 hregs->reset = 0; 134 } 135 136 static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs, 137 struct sgiseeq_regs *sregs) 138 { 139 hregs->rx_ctrl = hregs->tx_ctrl = 0; 140 hpc3_eth_reset(hregs); 141 } 142 143 #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \ 144 SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC) 145 146 static inline void seeq_go(struct sgiseeq_private *sp, 147 struct hpc3_ethregs *hregs, 148 struct sgiseeq_regs *sregs) 149 { 150 sregs->rstat = sp->mode | RSTAT_GO_BITS; 151 hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE; 152 } 153 154 static inline void __sgiseeq_set_mac_address(struct net_device *dev) 155 { 156 struct sgiseeq_private *sp = netdev_priv(dev); 157 struct sgiseeq_regs *sregs = sp->sregs; 158 int i; 159 160 sregs->tstat = SEEQ_TCMD_RB0; 161 for (i = 0; i < 6; i++) 162 sregs->rw.eth_addr[i] = dev->dev_addr[i]; 163 } 164 165 static int sgiseeq_set_mac_address(struct net_device *dev, void *addr) 166 { 167 struct sgiseeq_private *sp = netdev_priv(dev); 168 struct sockaddr *sa = addr; 169 170 eth_hw_addr_set(dev, sa->sa_data); 171 172 spin_lock_irq(&sp->tx_lock); 173 __sgiseeq_set_mac_address(dev); 174 spin_unlock_irq(&sp->tx_lock); 175 176 return 0; 177 } 178 179 #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD) 180 #define RCNTCFG_INIT (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE) 181 #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT)) 182 183 static int seeq_init_ring(struct net_device *dev) 184 { 185 struct sgiseeq_private *sp = netdev_priv(dev); 186 int i; 187 188 netif_stop_queue(dev); 189 sp->rx_new = sp->tx_new = 0; 190 sp->rx_old = sp->tx_old = 0; 191 192 __sgiseeq_set_mac_address(dev); 193 194 /* Setup tx ring. */ 195 for(i = 0; i < SEEQ_TX_BUFFERS; i++) { 196 sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT; 197 dma_sync_desc_dev(dev, &sp->tx_desc[i]); 198 } 199 200 /* And now the rx ring. */ 201 for (i = 0; i < SEEQ_RX_BUFFERS; i++) { 202 if (!sp->rx_desc[i].skb) { 203 dma_addr_t dma_addr; 204 struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ); 205 206 if (skb == NULL) 207 return -ENOMEM; 208 skb_reserve(skb, 2); 209 dma_addr = dma_map_single(dev->dev.parent, 210 skb->data - 2, 211 PKT_BUF_SZ, DMA_FROM_DEVICE); 212 sp->rx_desc[i].skb = skb; 213 sp->rx_desc[i].rdma.pbuf = dma_addr; 214 } 215 sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT; 216 dma_sync_desc_dev(dev, &sp->rx_desc[i]); 217 } 218 sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR; 219 dma_sync_desc_dev(dev, &sp->rx_desc[i - 1]); 220 return 0; 221 } 222 223 static void seeq_purge_ring(struct net_device *dev) 224 { 225 struct sgiseeq_private *sp = netdev_priv(dev); 226 int i; 227 228 /* clear tx ring. */ 229 for (i = 0; i < SEEQ_TX_BUFFERS; i++) { 230 if (sp->tx_desc[i].skb) { 231 dev_kfree_skb(sp->tx_desc[i].skb); 232 sp->tx_desc[i].skb = NULL; 233 } 234 } 235 236 /* And now the rx ring. */ 237 for (i = 0; i < SEEQ_RX_BUFFERS; i++) { 238 if (sp->rx_desc[i].skb) { 239 dev_kfree_skb(sp->rx_desc[i].skb); 240 sp->rx_desc[i].skb = NULL; 241 } 242 } 243 } 244 245 #ifdef DEBUG 246 static struct sgiseeq_private *gpriv; 247 static struct net_device *gdev; 248 249 static void sgiseeq_dump_rings(void) 250 { 251 static int once; 252 struct sgiseeq_rx_desc *r = gpriv->rx_desc; 253 struct sgiseeq_tx_desc *t = gpriv->tx_desc; 254 struct hpc3_ethregs *hregs = gpriv->hregs; 255 int i; 256 257 if (once) 258 return; 259 once++; 260 printk("RING DUMP:\n"); 261 for (i = 0; i < SEEQ_RX_BUFFERS; i++) { 262 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ", 263 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo, 264 r[i].rdma.pnext); 265 i += 1; 266 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n", 267 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo, 268 r[i].rdma.pnext); 269 } 270 for (i = 0; i < SEEQ_TX_BUFFERS; i++) { 271 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ", 272 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo, 273 t[i].tdma.pnext); 274 i += 1; 275 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n", 276 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo, 277 t[i].tdma.pnext); 278 } 279 printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n", 280 gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old); 281 printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n", 282 hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl); 283 printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n", 284 hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl); 285 } 286 #endif 287 288 #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF) 289 #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2) 290 291 static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp, 292 struct sgiseeq_regs *sregs) 293 { 294 struct hpc3_ethregs *hregs = sp->hregs; 295 int err; 296 297 reset_hpc3_and_seeq(hregs, sregs); 298 err = seeq_init_ring(dev); 299 if (err) 300 return err; 301 302 /* Setup to field the proper interrupt types. */ 303 if (sp->is_edlc) { 304 sregs->tstat = TSTAT_INIT_EDLC; 305 sregs->rw.wregs.control = sp->control; 306 sregs->rw.wregs.frame_gap = 0; 307 } else { 308 sregs->tstat = TSTAT_INIT_SEEQ; 309 } 310 311 hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc); 312 hregs->tx_ndptr = VIRT_TO_DMA(sp, sp->tx_desc); 313 314 seeq_go(sp, hregs, sregs); 315 return 0; 316 } 317 318 static void record_rx_errors(struct net_device *dev, unsigned char status) 319 { 320 if (status & SEEQ_RSTAT_OVERF || 321 status & SEEQ_RSTAT_SFRAME) 322 dev->stats.rx_over_errors++; 323 if (status & SEEQ_RSTAT_CERROR) 324 dev->stats.rx_crc_errors++; 325 if (status & SEEQ_RSTAT_DERROR) 326 dev->stats.rx_frame_errors++; 327 if (status & SEEQ_RSTAT_REOF) 328 dev->stats.rx_errors++; 329 } 330 331 static inline void rx_maybe_restart(struct sgiseeq_private *sp, 332 struct hpc3_ethregs *hregs, 333 struct sgiseeq_regs *sregs) 334 { 335 if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) { 336 hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc + sp->rx_new); 337 seeq_go(sp, hregs, sregs); 338 } 339 } 340 341 static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp, 342 struct hpc3_ethregs *hregs, 343 struct sgiseeq_regs *sregs) 344 { 345 struct sgiseeq_rx_desc *rd; 346 struct sk_buff *skb = NULL; 347 struct sk_buff *newskb; 348 unsigned char pkt_status; 349 int len = 0; 350 unsigned int orig_end = PREV_RX(sp->rx_new); 351 352 /* Service every received packet. */ 353 rd = &sp->rx_desc[sp->rx_new]; 354 dma_sync_desc_cpu(dev, rd); 355 while (!(rd->rdma.cntinfo & HPCDMA_OWN)) { 356 len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3; 357 dma_unmap_single(dev->dev.parent, rd->rdma.pbuf, 358 PKT_BUF_SZ, DMA_FROM_DEVICE); 359 pkt_status = rd->skb->data[len]; 360 if (pkt_status & SEEQ_RSTAT_FIG) { 361 /* Packet is OK. */ 362 /* We don't want to receive our own packets */ 363 if (!ether_addr_equal(rd->skb->data + 6, dev->dev_addr)) { 364 if (len > rx_copybreak) { 365 skb = rd->skb; 366 newskb = netdev_alloc_skb(dev, PKT_BUF_SZ); 367 if (!newskb) { 368 newskb = skb; 369 skb = NULL; 370 goto memory_squeeze; 371 } 372 skb_reserve(newskb, 2); 373 } else { 374 skb = netdev_alloc_skb_ip_align(dev, len); 375 if (skb) 376 skb_copy_to_linear_data(skb, rd->skb->data, len); 377 378 newskb = rd->skb; 379 } 380 memory_squeeze: 381 if (skb) { 382 skb_put(skb, len); 383 skb->protocol = eth_type_trans(skb, dev); 384 netif_rx(skb); 385 dev->stats.rx_packets++; 386 dev->stats.rx_bytes += len; 387 } else { 388 dev->stats.rx_dropped++; 389 } 390 } else { 391 /* Silently drop my own packets */ 392 newskb = rd->skb; 393 } 394 } else { 395 record_rx_errors(dev, pkt_status); 396 newskb = rd->skb; 397 } 398 rd->skb = newskb; 399 rd->rdma.pbuf = dma_map_single(dev->dev.parent, 400 newskb->data - 2, 401 PKT_BUF_SZ, DMA_FROM_DEVICE); 402 403 /* Return the entry to the ring pool. */ 404 rd->rdma.cntinfo = RCNTINFO_INIT; 405 sp->rx_new = NEXT_RX(sp->rx_new); 406 dma_sync_desc_dev(dev, rd); 407 rd = &sp->rx_desc[sp->rx_new]; 408 dma_sync_desc_cpu(dev, rd); 409 } 410 dma_sync_desc_dev(dev, rd); 411 412 dma_sync_desc_cpu(dev, &sp->rx_desc[orig_end]); 413 sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR); 414 dma_sync_desc_dev(dev, &sp->rx_desc[orig_end]); 415 dma_sync_desc_cpu(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]); 416 sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR; 417 dma_sync_desc_dev(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]); 418 rx_maybe_restart(sp, hregs, sregs); 419 } 420 421 static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp, 422 struct sgiseeq_regs *sregs) 423 { 424 if (sp->is_edlc) { 425 sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT); 426 sregs->rw.wregs.control = sp->control; 427 } 428 } 429 430 static inline void kick_tx(struct net_device *dev, 431 struct sgiseeq_private *sp, 432 struct hpc3_ethregs *hregs) 433 { 434 struct sgiseeq_tx_desc *td; 435 int i = sp->tx_old; 436 437 /* If the HPC aint doin nothin, and there are more packets 438 * with ETXD cleared and XIU set we must make very certain 439 * that we restart the HPC else we risk locking up the 440 * adapter. The following code is only safe iff the HPCDMA 441 * is not active! 442 */ 443 td = &sp->tx_desc[i]; 444 dma_sync_desc_cpu(dev, td); 445 while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) == 446 (HPCDMA_XIU | HPCDMA_ETXD)) { 447 i = NEXT_TX(i); 448 td = &sp->tx_desc[i]; 449 dma_sync_desc_cpu(dev, td); 450 } 451 if (td->tdma.cntinfo & HPCDMA_XIU) { 452 dma_sync_desc_dev(dev, td); 453 hregs->tx_ndptr = VIRT_TO_DMA(sp, td); 454 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; 455 } 456 } 457 458 static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp, 459 struct hpc3_ethregs *hregs, 460 struct sgiseeq_regs *sregs) 461 { 462 struct sgiseeq_tx_desc *td; 463 unsigned long status = hregs->tx_ctrl; 464 int j; 465 466 tx_maybe_reset_collisions(sp, sregs); 467 468 if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) { 469 /* Oops, HPC detected some sort of error. */ 470 if (status & SEEQ_TSTAT_R16) 471 dev->stats.tx_aborted_errors++; 472 if (status & SEEQ_TSTAT_UFLOW) 473 dev->stats.tx_fifo_errors++; 474 if (status & SEEQ_TSTAT_LCLS) 475 dev->stats.collisions++; 476 } 477 478 /* Ack 'em... */ 479 for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) { 480 td = &sp->tx_desc[j]; 481 482 dma_sync_desc_cpu(dev, td); 483 if (!(td->tdma.cntinfo & (HPCDMA_XIU))) 484 break; 485 if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) { 486 dma_sync_desc_dev(dev, td); 487 if (!(status & HPC3_ETXCTRL_ACTIVE)) { 488 hregs->tx_ndptr = VIRT_TO_DMA(sp, td); 489 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; 490 } 491 break; 492 } 493 dev->stats.tx_packets++; 494 sp->tx_old = NEXT_TX(sp->tx_old); 495 td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE); 496 td->tdma.cntinfo |= HPCDMA_EOX; 497 if (td->skb) { 498 dev_kfree_skb_any(td->skb); 499 td->skb = NULL; 500 } 501 dma_sync_desc_dev(dev, td); 502 } 503 } 504 505 static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id) 506 { 507 struct net_device *dev = (struct net_device *) dev_id; 508 struct sgiseeq_private *sp = netdev_priv(dev); 509 struct hpc3_ethregs *hregs = sp->hregs; 510 struct sgiseeq_regs *sregs = sp->sregs; 511 512 spin_lock(&sp->tx_lock); 513 514 /* Ack the IRQ and set software state. */ 515 hregs->reset = HPC3_ERST_CLRIRQ; 516 517 /* Always check for received packets. */ 518 sgiseeq_rx(dev, sp, hregs, sregs); 519 520 /* Only check for tx acks if we have something queued. */ 521 if (sp->tx_old != sp->tx_new) 522 sgiseeq_tx(dev, sp, hregs, sregs); 523 524 if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) { 525 netif_wake_queue(dev); 526 } 527 spin_unlock(&sp->tx_lock); 528 529 return IRQ_HANDLED; 530 } 531 532 static int sgiseeq_open(struct net_device *dev) 533 { 534 struct sgiseeq_private *sp = netdev_priv(dev); 535 struct sgiseeq_regs *sregs = sp->sregs; 536 unsigned int irq = dev->irq; 537 int err; 538 539 if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) { 540 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq); 541 return -EAGAIN; 542 } 543 544 err = init_seeq(dev, sp, sregs); 545 if (err) 546 goto out_free_irq; 547 548 netif_start_queue(dev); 549 550 return 0; 551 552 out_free_irq: 553 free_irq(irq, dev); 554 555 return err; 556 } 557 558 static int sgiseeq_close(struct net_device *dev) 559 { 560 struct sgiseeq_private *sp = netdev_priv(dev); 561 struct sgiseeq_regs *sregs = sp->sregs; 562 unsigned int irq = dev->irq; 563 564 netif_stop_queue(dev); 565 566 /* Shutdown the Seeq. */ 567 reset_hpc3_and_seeq(sp->hregs, sregs); 568 free_irq(irq, dev); 569 seeq_purge_ring(dev); 570 571 return 0; 572 } 573 574 static inline int sgiseeq_reset(struct net_device *dev) 575 { 576 struct sgiseeq_private *sp = netdev_priv(dev); 577 struct sgiseeq_regs *sregs = sp->sregs; 578 int err; 579 580 err = init_seeq(dev, sp, sregs); 581 if (err) 582 return err; 583 584 netif_trans_update(dev); /* prevent tx timeout */ 585 netif_wake_queue(dev); 586 587 return 0; 588 } 589 590 static netdev_tx_t 591 sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev) 592 { 593 struct sgiseeq_private *sp = netdev_priv(dev); 594 struct hpc3_ethregs *hregs = sp->hregs; 595 unsigned long flags; 596 struct sgiseeq_tx_desc *td; 597 int len, entry; 598 599 spin_lock_irqsave(&sp->tx_lock, flags); 600 601 /* Setup... */ 602 len = skb->len; 603 if (len < ETH_ZLEN) { 604 if (skb_padto(skb, ETH_ZLEN)) { 605 spin_unlock_irqrestore(&sp->tx_lock, flags); 606 return NETDEV_TX_OK; 607 } 608 len = ETH_ZLEN; 609 } 610 611 dev->stats.tx_bytes += len; 612 entry = sp->tx_new; 613 td = &sp->tx_desc[entry]; 614 dma_sync_desc_cpu(dev, td); 615 616 /* Create entry. There are so many races with adding a new 617 * descriptor to the chain: 618 * 1) Assume that the HPC is off processing a DMA chain while 619 * we are changing all of the following. 620 * 2) Do no allow the HPC to look at a new descriptor until 621 * we have completely set up it's state. This means, do 622 * not clear HPCDMA_EOX in the current last descritptor 623 * until the one we are adding looks consistent and could 624 * be processes right now. 625 * 3) The tx interrupt code must notice when we've added a new 626 * entry and the HPC got to the end of the chain before we 627 * added this new entry and restarted it. 628 */ 629 td->skb = skb; 630 td->tdma.pbuf = dma_map_single(dev->dev.parent, skb->data, 631 len, DMA_TO_DEVICE); 632 td->tdma.cntinfo = (len & HPCDMA_BCNT) | 633 HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX; 634 dma_sync_desc_dev(dev, td); 635 if (sp->tx_old != sp->tx_new) { 636 struct sgiseeq_tx_desc *backend; 637 638 backend = &sp->tx_desc[PREV_TX(sp->tx_new)]; 639 dma_sync_desc_cpu(dev, backend); 640 backend->tdma.cntinfo &= ~HPCDMA_EOX; 641 dma_sync_desc_dev(dev, backend); 642 } 643 sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */ 644 645 /* Maybe kick the HPC back into motion. */ 646 if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE)) 647 kick_tx(dev, sp, hregs); 648 649 if (!TX_BUFFS_AVAIL(sp)) 650 netif_stop_queue(dev); 651 spin_unlock_irqrestore(&sp->tx_lock, flags); 652 653 return NETDEV_TX_OK; 654 } 655 656 static void timeout(struct net_device *dev, unsigned int txqueue) 657 { 658 printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name); 659 sgiseeq_reset(dev); 660 661 netif_trans_update(dev); /* prevent tx timeout */ 662 netif_wake_queue(dev); 663 } 664 665 static void sgiseeq_set_multicast(struct net_device *dev) 666 { 667 struct sgiseeq_private *sp = netdev_priv(dev); 668 unsigned char oldmode = sp->mode; 669 670 if(dev->flags & IFF_PROMISC) 671 sp->mode = SEEQ_RCMD_RANY; 672 else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev)) 673 sp->mode = SEEQ_RCMD_RBMCAST; 674 else 675 sp->mode = SEEQ_RCMD_RBCAST; 676 677 /* XXX I know this sucks, but is there a better way to reprogram 678 * XXX the receiver? At least, this shouldn't happen too often. 679 */ 680 681 if (oldmode != sp->mode) 682 sgiseeq_reset(dev); 683 } 684 685 static inline void setup_tx_ring(struct net_device *dev, 686 struct sgiseeq_tx_desc *buf, 687 int nbufs) 688 { 689 struct sgiseeq_private *sp = netdev_priv(dev); 690 int i = 0; 691 692 while (i < (nbufs - 1)) { 693 buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf + i + 1); 694 buf[i].tdma.pbuf = 0; 695 dma_sync_desc_dev(dev, &buf[i]); 696 i++; 697 } 698 buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf); 699 dma_sync_desc_dev(dev, &buf[i]); 700 } 701 702 static inline void setup_rx_ring(struct net_device *dev, 703 struct sgiseeq_rx_desc *buf, 704 int nbufs) 705 { 706 struct sgiseeq_private *sp = netdev_priv(dev); 707 int i = 0; 708 709 while (i < (nbufs - 1)) { 710 buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf + i + 1); 711 buf[i].rdma.pbuf = 0; 712 dma_sync_desc_dev(dev, &buf[i]); 713 i++; 714 } 715 buf[i].rdma.pbuf = 0; 716 buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf); 717 dma_sync_desc_dev(dev, &buf[i]); 718 } 719 720 static const struct net_device_ops sgiseeq_netdev_ops = { 721 .ndo_open = sgiseeq_open, 722 .ndo_stop = sgiseeq_close, 723 .ndo_start_xmit = sgiseeq_start_xmit, 724 .ndo_tx_timeout = timeout, 725 .ndo_set_rx_mode = sgiseeq_set_multicast, 726 .ndo_set_mac_address = sgiseeq_set_mac_address, 727 .ndo_validate_addr = eth_validate_addr, 728 }; 729 730 static int sgiseeq_probe(struct platform_device *pdev) 731 { 732 struct sgiseeq_platform_data *pd = dev_get_platdata(&pdev->dev); 733 struct hpc3_regs *hpcregs = pd->hpc; 734 struct sgiseeq_init_block *sr; 735 unsigned int irq = pd->irq; 736 struct sgiseeq_private *sp; 737 struct net_device *dev; 738 int err; 739 740 dev = alloc_etherdev(sizeof (struct sgiseeq_private)); 741 if (!dev) { 742 err = -ENOMEM; 743 goto err_out; 744 } 745 746 platform_set_drvdata(pdev, dev); 747 SET_NETDEV_DEV(dev, &pdev->dev); 748 sp = netdev_priv(dev); 749 750 /* Make private data page aligned */ 751 sr = dma_alloc_noncoherent(&pdev->dev, sizeof(*sp->srings), 752 &sp->srings_dma, DMA_BIDIRECTIONAL, GFP_KERNEL); 753 if (!sr) { 754 printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n"); 755 err = -ENOMEM; 756 goto err_out_free_dev; 757 } 758 sp->srings = sr; 759 sp->rx_desc = sp->srings->rxvector; 760 sp->tx_desc = sp->srings->txvector; 761 spin_lock_init(&sp->tx_lock); 762 763 /* A couple calculations now, saves many cycles later. */ 764 setup_rx_ring(dev, sp->rx_desc, SEEQ_RX_BUFFERS); 765 setup_tx_ring(dev, sp->tx_desc, SEEQ_TX_BUFFERS); 766 767 eth_hw_addr_set(dev, pd->mac); 768 769 #ifdef DEBUG 770 gpriv = sp; 771 gdev = dev; 772 #endif 773 sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0]; 774 sp->hregs = &hpcregs->ethregs; 775 sp->name = sgiseeqstr; 776 sp->mode = SEEQ_RCMD_RBCAST; 777 778 /* Setup PIO and DMA transfer timing */ 779 sp->hregs->pconfig = 0x161; 780 sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP | 781 HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026; 782 783 /* Setup PIO and DMA transfer timing */ 784 sp->hregs->pconfig = 0x161; 785 sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP | 786 HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026; 787 788 /* Reset the chip. */ 789 hpc3_eth_reset(sp->hregs); 790 791 sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff); 792 if (sp->is_edlc) 793 sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT | 794 SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT | 795 SEEQ_CTRL_ENCARR; 796 797 dev->netdev_ops = &sgiseeq_netdev_ops; 798 dev->watchdog_timeo = (200 * HZ) / 1000; 799 dev->irq = irq; 800 801 if (register_netdev(dev)) { 802 printk(KERN_ERR "Sgiseeq: Cannot register net device, " 803 "aborting.\n"); 804 err = -ENODEV; 805 goto err_out_free_attrs; 806 } 807 808 printk(KERN_INFO "%s: %s %pM\n", dev->name, sgiseeqstr, dev->dev_addr); 809 810 return 0; 811 812 err_out_free_attrs: 813 dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings, 814 sp->srings_dma, DMA_BIDIRECTIONAL); 815 err_out_free_dev: 816 free_netdev(dev); 817 818 err_out: 819 return err; 820 } 821 822 static int sgiseeq_remove(struct platform_device *pdev) 823 { 824 struct net_device *dev = platform_get_drvdata(pdev); 825 struct sgiseeq_private *sp = netdev_priv(dev); 826 827 unregister_netdev(dev); 828 dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings, 829 sp->srings_dma, DMA_BIDIRECTIONAL); 830 free_netdev(dev); 831 832 return 0; 833 } 834 835 static struct platform_driver sgiseeq_driver = { 836 .probe = sgiseeq_probe, 837 .remove = sgiseeq_remove, 838 .driver = { 839 .name = "sgiseeq", 840 } 841 }; 842 843 module_platform_driver(sgiseeq_driver); 844 845 MODULE_DESCRIPTION("SGI Seeq 8003 driver"); 846 MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>"); 847 MODULE_LICENSE("GPL"); 848 MODULE_ALIAS("platform:sgiseeq"); 849