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Linux 2.6.20.7
[linux/fpc-iii.git] / drivers / net / sgiseeq.c
bloba833e7f9757f4b12757f9229e8aa127b9527172d
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/ioport.h>
16 #include <linux/socket.h>
17 #include <linux/in.h>
18 #include <linux/route.h>
19 #include <linux/slab.h>
20 #include <linux/string.h>
21 #include <linux/delay.h>
22 #include <linux/netdevice.h>
23 #include <linux/etherdevice.h>
24 #include <linux/skbuff.h>
25 #include <linux/bitops.h>
26
27 #include <asm/byteorder.h>
28 #include <asm/io.h>
29 #include <asm/system.h>
30 #include <asm/page.h>
31 #include <asm/pgtable.h>
32 #include <asm/sgi/hpc3.h>
33 #include <asm/sgi/ip22.h>
34 #include <asm/sgialib.h>
35
36 #include "sgiseeq.h"
37
38 static char *sgiseeqstr = "SGI Seeq8003";
39
40 /*
41 * If you want speed, you do something silly, it always has worked for me. So,
42 * with that in mind, I've decided to make this driver look completely like a
43 * stupid Lance from a driver architecture perspective. Only difference is that
44 * here our "ring buffer" looks and acts like a real Lance one does but is
45 * layed out like how the HPC DMA and the Seeq want it to. You'd be surprised
46 * how a stupid idea like this can pay off in performance, not to mention
47 * making this driver 2,000 times easier to write. ;-)
48 */
49
50 /* Tune these if we tend to run out often etc. */
51 #define SEEQ_RX_BUFFERS 16
52 #define SEEQ_TX_BUFFERS 16
53
54 #define PKT_BUF_SZ 1584
55
56 #define NEXT_RX(i) (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
57 #define NEXT_TX(i) (((i) + 1) & (SEEQ_TX_BUFFERS - 1))
58 #define PREV_RX(i) (((i) - 1) & (SEEQ_RX_BUFFERS - 1))
59 #define PREV_TX(i) (((i) - 1) & (SEEQ_TX_BUFFERS - 1))
60
61 #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \
62 sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \
63 sp->tx_old - sp->tx_new - 1)
64
65 struct sgiseeq_rx_desc {
66 volatile struct hpc_dma_desc rdma;
67 volatile signed int buf_vaddr;
68 };
69
70 struct sgiseeq_tx_desc {
71 volatile struct hpc_dma_desc tdma;
72 volatile signed int buf_vaddr;
73 };
74
75 /*
76 * Warning: This structure is layed out in a certain way because HPC dma
77 * descriptors must be 8-byte aligned. So don't touch this without
78 * some care.
79 */
80 struct sgiseeq_init_block { /* Note the name ;-) */
81 struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
82 struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
83 };
84
85 struct sgiseeq_private {
86 struct sgiseeq_init_block *srings;
87
88 /* Ptrs to the descriptors in uncached space. */
89 struct sgiseeq_rx_desc *rx_desc;
90 struct sgiseeq_tx_desc *tx_desc;
91
92 char *name;
93 struct hpc3_ethregs *hregs;
94 struct sgiseeq_regs *sregs;
95
96 /* Ring entry counters. */
97 unsigned int rx_new, tx_new;
98 unsigned int rx_old, tx_old;
99
100 int is_edlc;
101 unsigned char control;
102 unsigned char mode;
103
104 struct net_device_stats stats;
105
106 struct net_device *next_module;
107 spinlock_t tx_lock;
108 };
109
110 /* A list of all installed seeq devices, for removing the driver module. */
111 static struct net_device *root_sgiseeq_dev;
112
113 static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs)
114 {
115 hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ;
116 udelay(20);
117 hregs->reset = 0;
118 }
119
120 static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs,
121 struct sgiseeq_regs *sregs)
122 {
123 hregs->rx_ctrl = hregs->tx_ctrl = 0;
124 hpc3_eth_reset(hregs);
125 }
126
127 #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \
128 SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)
129
130 static inline void seeq_go(struct sgiseeq_private *sp,
131 struct hpc3_ethregs *hregs,
132 struct sgiseeq_regs *sregs)
133 {
134 sregs->rstat = sp->mode | RSTAT_GO_BITS;
135 hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;
136 }
137
138 static inline void __sgiseeq_set_mac_address(struct net_device *dev)
139 {
140 struct sgiseeq_private *sp = netdev_priv(dev);
141 struct sgiseeq_regs *sregs = sp->sregs;
142 int i;
143
144 sregs->tstat = SEEQ_TCMD_RB0;
145 for (i = 0; i < 6; i++)
146 sregs->rw.eth_addr[i] = dev->dev_addr[i];
147 }
148
149 static int sgiseeq_set_mac_address(struct net_device *dev, void *addr)
150 {
151 struct sgiseeq_private *sp = netdev_priv(dev);
152 struct sockaddr *sa = addr;
153
154 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
155
156 spin_lock_irq(&sp->tx_lock);
157 __sgiseeq_set_mac_address(dev);
158 spin_unlock_irq(&sp->tx_lock);
159
160 return 0;
161 }
162
163 #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
164 #define RCNTCFG_INIT (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
165 #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
166
167 static int seeq_init_ring(struct net_device *dev)
168 {
169 struct sgiseeq_private *sp = netdev_priv(dev);
170 int i;
171
172 netif_stop_queue(dev);
173 sp->rx_new = sp->tx_new = 0;
174 sp->rx_old = sp->tx_old = 0;
175
176 __sgiseeq_set_mac_address(dev);
177
178 /* Setup tx ring. */
179 for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
180 if (!sp->tx_desc[i].tdma.pbuf) {
181 unsigned long buffer;
182
183 buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
184 if (!buffer)
185 return -ENOMEM;
186 sp->tx_desc[i].buf_vaddr = CKSEG1ADDR(buffer);
187 sp->tx_desc[i].tdma.pbuf = CPHYSADDR(buffer);
188 }
189 sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
190 }
191
192 /* And now the rx ring. */
193 for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
194 if (!sp->rx_desc[i].rdma.pbuf) {
195 unsigned long buffer;
196
197 buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL);
198 if (!buffer)
199 return -ENOMEM;
200 sp->rx_desc[i].buf_vaddr = CKSEG1ADDR(buffer);
201 sp->rx_desc[i].rdma.pbuf = CPHYSADDR(buffer);
202 }
203 sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
204 }
205 sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;
206 return 0;
207 }
208
209 #ifdef DEBUG
210 static struct sgiseeq_private *gpriv;
211 static struct net_device *gdev;
212
213 static void sgiseeq_dump_rings(void)
214 {
215 static int once;
216 struct sgiseeq_rx_desc *r = gpriv->rx_desc;
217 struct sgiseeq_tx_desc *t = gpriv->tx_desc;
218 struct hpc3_ethregs *hregs = gpriv->hregs;
219 int i;
220
221 if (once)
222 return;
223 once++;
224 printk("RING DUMP:\n");
225 for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
226 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
227 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
228 r[i].rdma.pnext);
229 i += 1;
230 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
231 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
232 r[i].rdma.pnext);
233 }
234 for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
235 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
236 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
237 t[i].tdma.pnext);
238 i += 1;
239 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
240 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
241 t[i].tdma.pnext);
242 }
243 printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
244 gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
245 printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
246 hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
247 printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
248 hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
249 }
250 #endif
251
252 #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
253 #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
254
255 static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
256 struct sgiseeq_regs *sregs)
257 {
258 struct hpc3_ethregs *hregs = sp->hregs;
259 int err;
260
261 reset_hpc3_and_seeq(hregs, sregs);
262 err = seeq_init_ring(dev);
263 if (err)
264 return err;
265
266 /* Setup to field the proper interrupt types. */
267 if (sp->is_edlc) {
268 sregs->tstat = TSTAT_INIT_EDLC;
269 sregs->rw.wregs.control = sp->control;
270 sregs->rw.wregs.frame_gap = 0;
271 } else {
272 sregs->tstat = TSTAT_INIT_SEEQ;
273 }
274
275 hregs->rx_ndptr = CPHYSADDR(sp->rx_desc);
276 hregs->tx_ndptr = CPHYSADDR(sp->tx_desc);
277
278 seeq_go(sp, hregs, sregs);
279 return 0;
280 }
281
282 static inline void record_rx_errors(struct sgiseeq_private *sp,
283 unsigned char status)
284 {
285 if (status & SEEQ_RSTAT_OVERF ||
286 status & SEEQ_RSTAT_SFRAME)
287 sp->stats.rx_over_errors++;
288 if (status & SEEQ_RSTAT_CERROR)
289 sp->stats.rx_crc_errors++;
290 if (status & SEEQ_RSTAT_DERROR)
291 sp->stats.rx_frame_errors++;
292 if (status & SEEQ_RSTAT_REOF)
293 sp->stats.rx_errors++;
294 }
295
296 static inline void rx_maybe_restart(struct sgiseeq_private *sp,
297 struct hpc3_ethregs *hregs,
298 struct sgiseeq_regs *sregs)
299 {
300 if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
301 hregs->rx_ndptr = CPHYSADDR(sp->rx_desc + sp->rx_new);
302 seeq_go(sp, hregs, sregs);
303 }
304 }
305
306 #define for_each_rx(rd, sp) for((rd) = &(sp)->rx_desc[(sp)->rx_new]; \
307 !((rd)->rdma.cntinfo & HPCDMA_OWN); \
308 (rd) = &(sp)->rx_desc[(sp)->rx_new])
309
310 static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
311 struct hpc3_ethregs *hregs,
312 struct sgiseeq_regs *sregs)
313 {
314 struct sgiseeq_rx_desc *rd;
315 struct sk_buff *skb = NULL;
316 unsigned char pkt_status;
317 unsigned char *pkt_pointer = NULL;
318 int len = 0;
319 unsigned int orig_end = PREV_RX(sp->rx_new);
320
321 /* Service every received packet. */
322 for_each_rx(rd, sp) {
323 len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
324 pkt_pointer = (unsigned char *)(long)rd->buf_vaddr;
325 pkt_status = pkt_pointer[len + 2];
326
327 if (pkt_status & SEEQ_RSTAT_FIG) {
328 /* Packet is OK. */
329 skb = dev_alloc_skb(len + 2);
330
331 if (skb) {
332 skb->dev = dev;
333 skb_reserve(skb, 2);
334 skb_put(skb, len);
335
336 /* Copy out of kseg1 to avoid silly cache flush. */
337 eth_copy_and_sum(skb, pkt_pointer + 2, len, 0);
338 skb->protocol = eth_type_trans(skb, dev);
339
340 /* We don't want to receive our own packets */
341 if (memcmp(eth_hdr(skb)->h_source, dev->dev_addr, ETH_ALEN)) {
342 netif_rx(skb);
343 dev->last_rx = jiffies;
344 sp->stats.rx_packets++;
345 sp->stats.rx_bytes += len;
346 } else {
347 /* Silently drop my own packets */
348 dev_kfree_skb_irq(skb);
349 }
350 } else {
351 printk (KERN_NOTICE "%s: Memory squeeze, deferring packet.\n",
352 dev->name);
353 sp->stats.rx_dropped++;
354 }
355 } else {
356 record_rx_errors(sp, pkt_status);
357 }
358
359 /* Return the entry to the ring pool. */
360 rd->rdma.cntinfo = RCNTINFO_INIT;
361 sp->rx_new = NEXT_RX(sp->rx_new);
362 }
363 sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
364 sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
365 rx_maybe_restart(sp, hregs, sregs);
366 }
367
368 static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
369 struct sgiseeq_regs *sregs)
370 {
371 if (sp->is_edlc) {
372 sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);
373 sregs->rw.wregs.control = sp->control;
374 }
375 }
376
377 static inline void kick_tx(struct sgiseeq_tx_desc *td,
378 struct hpc3_ethregs *hregs)
379 {
380 /* If the HPC aint doin nothin, and there are more packets
381 * with ETXD cleared and XIU set we must make very certain
382 * that we restart the HPC else we risk locking up the
383 * adapter. The following code is only safe iff the HPCDMA
384 * is not active!
385 */
386 while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
387 (HPCDMA_XIU | HPCDMA_ETXD))
388 td = (struct sgiseeq_tx_desc *)(long) CKSEG1ADDR(td->tdma.pnext);
389 if (td->tdma.cntinfo & HPCDMA_XIU) {
390 hregs->tx_ndptr = CPHYSADDR(td);
391 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
392 }
393 }
394
395 static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,
396 struct hpc3_ethregs *hregs,
397 struct sgiseeq_regs *sregs)
398 {
399 struct sgiseeq_tx_desc *td;
400 unsigned long status = hregs->tx_ctrl;
401 int j;
402
403 tx_maybe_reset_collisions(sp, sregs);
404
405 if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {
406 /* Oops, HPC detected some sort of error. */
407 if (status & SEEQ_TSTAT_R16)
408 sp->stats.tx_aborted_errors++;
409 if (status & SEEQ_TSTAT_UFLOW)
410 sp->stats.tx_fifo_errors++;
411 if (status & SEEQ_TSTAT_LCLS)
412 sp->stats.collisions++;
413 }
414
415 /* Ack 'em... */
416 for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
417 td = &sp->tx_desc[j];
418
419 if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
420 break;
421 if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
422 if (!(status & HPC3_ETXCTRL_ACTIVE)) {
423 hregs->tx_ndptr = CPHYSADDR(td);
424 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
425 }
426 break;
427 }
428 sp->stats.tx_packets++;
429 sp->tx_old = NEXT_TX(sp->tx_old);
430 td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
431 td->tdma.cntinfo |= HPCDMA_EOX;
432 }
433 }
434
435 static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id)
436 {
437 struct net_device *dev = (struct net_device *) dev_id;
438 struct sgiseeq_private *sp = netdev_priv(dev);
439 struct hpc3_ethregs *hregs = sp->hregs;
440 struct sgiseeq_regs *sregs = sp->sregs;
441
442 spin_lock(&sp->tx_lock);
443
444 /* Ack the IRQ and set software state. */
445 hregs->reset = HPC3_ERST_CLRIRQ;
446
447 /* Always check for received packets. */
448 sgiseeq_rx(dev, sp, hregs, sregs);
449
450 /* Only check for tx acks if we have something queued. */
451 if (sp->tx_old != sp->tx_new)
452 sgiseeq_tx(dev, sp, hregs, sregs);
453
454 if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {
455 netif_wake_queue(dev);
456 }
457 spin_unlock(&sp->tx_lock);
458
459 return IRQ_HANDLED;
460 }
461
462 static int sgiseeq_open(struct net_device *dev)
463 {
464 struct sgiseeq_private *sp = netdev_priv(dev);
465 struct sgiseeq_regs *sregs = sp->sregs;
466 unsigned int irq = dev->irq;
467 int err;
468
469 if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
470 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
471 err = -EAGAIN;
472 }
473
474 err = init_seeq(dev, sp, sregs);
475 if (err)
476 goto out_free_irq;
477
478 netif_start_queue(dev);
479
480 return 0;
481
482 out_free_irq:
483 free_irq(irq, dev);
484
485 return err;
486 }
487
488 static int sgiseeq_close(struct net_device *dev)
489 {
490 struct sgiseeq_private *sp = netdev_priv(dev);
491 struct sgiseeq_regs *sregs = sp->sregs;
492 unsigned int irq = dev->irq;
493
494 netif_stop_queue(dev);
495
496 /* Shutdown the Seeq. */
497 reset_hpc3_and_seeq(sp->hregs, sregs);
498 free_irq(irq, dev);
499
500 return 0;
501 }
502
503 static inline int sgiseeq_reset(struct net_device *dev)
504 {
505 struct sgiseeq_private *sp = netdev_priv(dev);
506 struct sgiseeq_regs *sregs = sp->sregs;
507 int err;
508
509 err = init_seeq(dev, sp, sregs);
510 if (err)
511 return err;
512
513 dev->trans_start = jiffies;
514 netif_wake_queue(dev);
515
516 return 0;
517 }
518
519 static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
520 {
521 struct sgiseeq_private *sp = netdev_priv(dev);
522 struct hpc3_ethregs *hregs = sp->hregs;
523 unsigned long flags;
524 struct sgiseeq_tx_desc *td;
525 int skblen, len, entry;
526
527 spin_lock_irqsave(&sp->tx_lock, flags);
528
529 /* Setup... */
530 skblen = skb->len;
531 len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
532 sp->stats.tx_bytes += len;
533 entry = sp->tx_new;
534 td = &sp->tx_desc[entry];
535
536 /* Create entry. There are so many races with adding a new
537 * descriptor to the chain:
538 * 1) Assume that the HPC is off processing a DMA chain while
539 * we are changing all of the following.
540 * 2) Do no allow the HPC to look at a new descriptor until
541 * we have completely set up it's state. This means, do
542 * not clear HPCDMA_EOX in the current last descritptor
543 * until the one we are adding looks consistent and could
544 * be processes right now.
545 * 3) The tx interrupt code must notice when we've added a new
546 * entry and the HPC got to the end of the chain before we
547 * added this new entry and restarted it.
548 */
549 memcpy((char *)(long)td->buf_vaddr, skb->data, skblen);
550 if (len != skblen)
551 memset((char *)(long)td->buf_vaddr + skb->len, 0, len-skblen);
552 td->tdma.cntinfo = (len & HPCDMA_BCNT) |
553 HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;
554 if (sp->tx_old != sp->tx_new) {
555 struct sgiseeq_tx_desc *backend;
556
557 backend = &sp->tx_desc[PREV_TX(sp->tx_new)];
558 backend->tdma.cntinfo &= ~HPCDMA_EOX;
559 }
560 sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
561
562 /* Maybe kick the HPC back into motion. */
563 if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
564 kick_tx(&sp->tx_desc[sp->tx_old], hregs);
565
566 dev->trans_start = jiffies;
567 dev_kfree_skb(skb);
568
569 if (!TX_BUFFS_AVAIL(sp))
570 netif_stop_queue(dev);
571 spin_unlock_irqrestore(&sp->tx_lock, flags);
572
573 return 0;
574 }
575
576 static void timeout(struct net_device *dev)
577 {
578 printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);
579 sgiseeq_reset(dev);
580
581 dev->trans_start = jiffies;
582 netif_wake_queue(dev);
583 }
584
585 static struct net_device_stats *sgiseeq_get_stats(struct net_device *dev)
586 {
587 struct sgiseeq_private *sp = netdev_priv(dev);
588
589 return &sp->stats;
590 }
591
592 static void sgiseeq_set_multicast(struct net_device *dev)
593 {
594 struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv;
595 unsigned char oldmode = sp->mode;
596
597 if(dev->flags & IFF_PROMISC)
598 sp->mode = SEEQ_RCMD_RANY;
599 else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count)
600 sp->mode = SEEQ_RCMD_RBMCAST;
601 else
602 sp->mode = SEEQ_RCMD_RBCAST;
603
604 /* XXX I know this sucks, but is there a better way to reprogram
605 * XXX the receiver? At least, this shouldn't happen too often.
606 */
607
608 if (oldmode != sp->mode)
609 sgiseeq_reset(dev);
610 }
611
612 static inline void setup_tx_ring(struct sgiseeq_tx_desc *buf, int nbufs)
613 {
614 int i = 0;
615
616 while (i < (nbufs - 1)) {
617 buf[i].tdma.pnext = CPHYSADDR(buf + i + 1);
618 buf[i].tdma.pbuf = 0;
619 i++;
620 }
621 buf[i].tdma.pnext = CPHYSADDR(buf);
622 }
623
624 static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs)
625 {
626 int i = 0;
627
628 while (i < (nbufs - 1)) {
629 buf[i].rdma.pnext = CPHYSADDR(buf + i + 1);
630 buf[i].rdma.pbuf = 0;
631 i++;
632 }
633 buf[i].rdma.pbuf = 0;
634 buf[i].rdma.pnext = CPHYSADDR(buf);
635 }
636
637 #define ALIGNED(x) ((((unsigned long)(x)) + 0xf) & ~(0xf))
638
639 static int sgiseeq_init(struct hpc3_regs* hpcregs, int irq)
640 {
641 struct sgiseeq_init_block *sr;
642 struct sgiseeq_private *sp;
643 struct net_device *dev;
644 int err, i;
645
646 dev = alloc_etherdev(sizeof (struct sgiseeq_private));
647 if (!dev) {
648 printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n");
649 err = -ENOMEM;
650 goto err_out;
651 }
652 sp = netdev_priv(dev);
653
654 /* Make private data page aligned */
655 sr = (struct sgiseeq_init_block *) get_zeroed_page(GFP_KERNEL);
656 if (!sr) {
657 printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
658 err = -ENOMEM;
659 goto err_out_free_dev;
660 }
661 sp->srings = sr;
662
663 #define EADDR_NVOFS 250
664 for (i = 0; i < 3; i++) {
665 unsigned short tmp = ip22_nvram_read(EADDR_NVOFS / 2 + i);
666
667 dev->dev_addr[2 * i] = tmp >> 8;
668 dev->dev_addr[2 * i + 1] = tmp & 0xff;
669 }
670
671 #ifdef DEBUG
672 gpriv = sp;
673 gdev = dev;
674 #endif
675 sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0];
676 sp->hregs = &hpcregs->ethregs;
677 sp->name = sgiseeqstr;
678 sp->mode = SEEQ_RCMD_RBCAST;
679
680 sp->rx_desc = (struct sgiseeq_rx_desc *)
681 CKSEG1ADDR(ALIGNED(&sp->srings->rxvector[0]));
682 dma_cache_wback_inv((unsigned long)&sp->srings->rxvector,
683 sizeof(sp->srings->rxvector));
684 sp->tx_desc = (struct sgiseeq_tx_desc *)
685 CKSEG1ADDR(ALIGNED(&sp->srings->txvector[0]));
686 dma_cache_wback_inv((unsigned long)&sp->srings->txvector,
687 sizeof(sp->srings->txvector));
688
689 /* A couple calculations now, saves many cycles later. */
690 setup_rx_ring(sp->rx_desc, SEEQ_RX_BUFFERS);
691 setup_tx_ring(sp->tx_desc, SEEQ_TX_BUFFERS);
692
693 /* Setup PIO and DMA transfer timing */
694 sp->hregs->pconfig = 0x161;
695 sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
696 HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
697
698 /* Reset the chip. */
699 hpc3_eth_reset(sp->hregs);
700
701 sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
702 if (sp->is_edlc)
703 sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
704 SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
705 SEEQ_CTRL_ENCARR;
706
707 dev->open = sgiseeq_open;
708 dev->stop = sgiseeq_close;
709 dev->hard_start_xmit = sgiseeq_start_xmit;
710 dev->tx_timeout = timeout;
711 dev->watchdog_timeo = (200 * HZ) / 1000;
712 dev->get_stats = sgiseeq_get_stats;
713 dev->set_multicast_list = sgiseeq_set_multicast;
714 dev->set_mac_address = sgiseeq_set_mac_address;
715 dev->irq = irq;
716
717 if (register_netdev(dev)) {
718 printk(KERN_ERR "Sgiseeq: Cannot register net device, "
719 "aborting.\n");
720 err = -ENODEV;
721 goto err_out_free_page;
722 }
723
724 printk(KERN_INFO "%s: %s ", dev->name, sgiseeqstr);
725 for (i = 0; i < 6; i++)
726 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
727
728 sp->next_module = root_sgiseeq_dev;
729 root_sgiseeq_dev = dev;
730
731 return 0;
732
733 err_out_free_page:
734 free_page((unsigned long) sp->srings);
735 err_out_free_dev:
736 kfree(dev);
737
738 err_out:
739 return err;
740 }
741
742 static int __init sgiseeq_probe(void)
743 {
744 /* On board adapter on 1st HPC is always present */
745 return sgiseeq_init(hpc3c0, SGI_ENET_IRQ);
746 }
747
748 static void __exit sgiseeq_exit(void)
749 {
750 struct net_device *next, *dev;
751 struct sgiseeq_private *sp;
752
753 for (dev = root_sgiseeq_dev; dev; dev = next) {
754 sp = (struct sgiseeq_private *) netdev_priv(dev);
755 next = sp->next_module;
756 unregister_netdev(dev);
757 free_page((unsigned long) sp->srings);
758 free_netdev(dev);
759 }
760 }
761
762 module_init(sgiseeq_probe);
763 module_exit(sgiseeq_exit);
764
765 MODULE_DESCRIPTION("SGI Seeq 8003 driver");
766 MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>");
767 MODULE_LICENSE("GPL");
Linux with added FPC-III support