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[ARM] pxa: Gumstix Verdex PCMCIA support
[linux-2.6/verdex.git] / drivers / net / sgiseeq.c
blobf4dfd1f679a9d925081a364cd500727734326b6e
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/string.h>
16 #include <linux/delay.h>
17 #include <linux/netdevice.h>
18 #include <linux/platform_device.h>
19 #include <linux/etherdevice.h>
20 #include <linux/skbuff.h>
21
22 #include <asm/sgi/hpc3.h>
23 #include <asm/sgi/ip22.h>
24 #include <asm/sgi/seeq.h>
25
26 #include "sgiseeq.h"
27
28 static char *sgiseeqstr = "SGI Seeq8003";
29
30 /*
31 * If you want speed, you do something silly, it always has worked for me. So,
32 * with that in mind, I've decided to make this driver look completely like a
33 * stupid Lance from a driver architecture perspective. Only difference is that
34 * here our "ring buffer" looks and acts like a real Lance one does but is
35 * layed out like how the HPC DMA and the Seeq want it to. You'd be surprised
36 * how a stupid idea like this can pay off in performance, not to mention
37 * making this driver 2,000 times easier to write. ;-)
38 */
39
40 /* Tune these if we tend to run out often etc. */
41 #define SEEQ_RX_BUFFERS 16
42 #define SEEQ_TX_BUFFERS 16
43
44 #define PKT_BUF_SZ 1584
45
46 #define NEXT_RX(i) (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
47 #define NEXT_TX(i) (((i) + 1) & (SEEQ_TX_BUFFERS - 1))
48 #define PREV_RX(i) (((i) - 1) & (SEEQ_RX_BUFFERS - 1))
49 #define PREV_TX(i) (((i) - 1) & (SEEQ_TX_BUFFERS - 1))
50
51 #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \
52 sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \
53 sp->tx_old - sp->tx_new - 1)
54
55 #define VIRT_TO_DMA(sp, v) ((sp)->srings_dma + \
56 (dma_addr_t)((unsigned long)(v) - \
57 (unsigned long)((sp)->rx_desc)))
58
59 /* Copy frames shorter than rx_copybreak, otherwise pass on up in
60 * a full sized sk_buff. Value of 100 stolen from tulip.c (!alpha).
61 */
62 static int rx_copybreak = 100;
63
64 #define PAD_SIZE (128 - sizeof(struct hpc_dma_desc) - sizeof(void *))
65
66 struct sgiseeq_rx_desc {
67 volatile struct hpc_dma_desc rdma;
68 u8 padding[PAD_SIZE];
69 struct sk_buff *skb;
70 };
71
72 struct sgiseeq_tx_desc {
73 volatile struct hpc_dma_desc tdma;
74 u8 padding[PAD_SIZE];
75 struct sk_buff *skb;
76 };
77
78 /*
79 * Warning: This structure is layed out in a certain way because HPC dma
80 * descriptors must be 8-byte aligned. So don't touch this without
81 * some care.
82 */
83 struct sgiseeq_init_block { /* Note the name ;-) */
84 struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
85 struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
86 };
87
88 struct sgiseeq_private {
89 struct sgiseeq_init_block *srings;
90 dma_addr_t srings_dma;
91
92 /* Ptrs to the descriptors in uncached space. */
93 struct sgiseeq_rx_desc *rx_desc;
94 struct sgiseeq_tx_desc *tx_desc;
95
96 char *name;
97 struct hpc3_ethregs *hregs;
98 struct sgiseeq_regs *sregs;
99
100 /* Ring entry counters. */
101 unsigned int rx_new, tx_new;
102 unsigned int rx_old, tx_old;
103
104 int is_edlc;
105 unsigned char control;
106 unsigned char mode;
107
108 spinlock_t tx_lock;
109 };
110
111 static inline void dma_sync_desc_cpu(struct net_device *dev, void *addr)
112 {
113 dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc),
114 DMA_FROM_DEVICE);
115 }
116
117 static inline void dma_sync_desc_dev(struct net_device *dev, void *addr)
118 {
119 dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc),
120 DMA_TO_DEVICE);
121 }
122
123 static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs)
124 {
125 hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ;
126 udelay(20);
127 hregs->reset = 0;
128 }
129
130 static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs,
131 struct sgiseeq_regs *sregs)
132 {
133 hregs->rx_ctrl = hregs->tx_ctrl = 0;
134 hpc3_eth_reset(hregs);
135 }
136
137 #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \
138 SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)
139
140 static inline void seeq_go(struct sgiseeq_private *sp,
141 struct hpc3_ethregs *hregs,
142 struct sgiseeq_regs *sregs)
143 {
144 sregs->rstat = sp->mode | RSTAT_GO_BITS;
145 hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;
146 }
147
148 static inline void __sgiseeq_set_mac_address(struct net_device *dev)
149 {
150 struct sgiseeq_private *sp = netdev_priv(dev);
151 struct sgiseeq_regs *sregs = sp->sregs;
152 int i;
153
154 sregs->tstat = SEEQ_TCMD_RB0;
155 for (i = 0; i < 6; i++)
156 sregs->rw.eth_addr[i] = dev->dev_addr[i];
157 }
158
159 static int sgiseeq_set_mac_address(struct net_device *dev, void *addr)
160 {
161 struct sgiseeq_private *sp = netdev_priv(dev);
162 struct sockaddr *sa = addr;
163
164 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
165
166 spin_lock_irq(&sp->tx_lock);
167 __sgiseeq_set_mac_address(dev);
168 spin_unlock_irq(&sp->tx_lock);
169
170 return 0;
171 }
172
173 #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
174 #define RCNTCFG_INIT (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
175 #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
176
177 static int seeq_init_ring(struct net_device *dev)
178 {
179 struct sgiseeq_private *sp = netdev_priv(dev);
180 int i;
181
182 netif_stop_queue(dev);
183 sp->rx_new = sp->tx_new = 0;
184 sp->rx_old = sp->tx_old = 0;
185
186 __sgiseeq_set_mac_address(dev);
187
188 /* Setup tx ring. */
189 for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
190 sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
191 dma_sync_desc_dev(dev, &sp->tx_desc[i]);
192 }
193
194 /* And now the rx ring. */
195 for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
196 if (!sp->rx_desc[i].skb) {
197 dma_addr_t dma_addr;
198 struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ);
199
200 if (skb == NULL)
201 return -ENOMEM;
202 skb_reserve(skb, 2);
203 dma_addr = dma_map_single(dev->dev.parent,
204 skb->data - 2,
205 PKT_BUF_SZ, DMA_FROM_DEVICE);
206 sp->rx_desc[i].skb = skb;
207 sp->rx_desc[i].rdma.pbuf = dma_addr;
208 }
209 sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
210 dma_sync_desc_dev(dev, &sp->rx_desc[i]);
211 }
212 sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;
213 dma_sync_desc_dev(dev, &sp->rx_desc[i - 1]);
214 return 0;
215 }
216
217 static void seeq_purge_ring(struct net_device *dev)
218 {
219 struct sgiseeq_private *sp = netdev_priv(dev);
220 int i;
221
222 /* clear tx ring. */
223 for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
224 if (sp->tx_desc[i].skb) {
225 dev_kfree_skb(sp->tx_desc[i].skb);
226 sp->tx_desc[i].skb = NULL;
227 }
228 }
229
230 /* And now the rx ring. */
231 for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
232 if (sp->rx_desc[i].skb) {
233 dev_kfree_skb(sp->rx_desc[i].skb);
234 sp->rx_desc[i].skb = NULL;
235 }
236 }
237 }
238
239 #ifdef DEBUG
240 static struct sgiseeq_private *gpriv;
241 static struct net_device *gdev;
242
243 static void sgiseeq_dump_rings(void)
244 {
245 static int once;
246 struct sgiseeq_rx_desc *r = gpriv->rx_desc;
247 struct sgiseeq_tx_desc *t = gpriv->tx_desc;
248 struct hpc3_ethregs *hregs = gpriv->hregs;
249 int i;
250
251 if (once)
252 return;
253 once++;
254 printk("RING DUMP:\n");
255 for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
256 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
257 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
258 r[i].rdma.pnext);
259 i += 1;
260 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
261 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
262 r[i].rdma.pnext);
263 }
264 for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
265 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
266 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
267 t[i].tdma.pnext);
268 i += 1;
269 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
270 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
271 t[i].tdma.pnext);
272 }
273 printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
274 gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
275 printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
276 hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
277 printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
278 hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
279 }
280 #endif
281
282 #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
283 #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
284
285 static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
286 struct sgiseeq_regs *sregs)
287 {
288 struct hpc3_ethregs *hregs = sp->hregs;
289 int err;
290
291 reset_hpc3_and_seeq(hregs, sregs);
292 err = seeq_init_ring(dev);
293 if (err)
294 return err;
295
296 /* Setup to field the proper interrupt types. */
297 if (sp->is_edlc) {
298 sregs->tstat = TSTAT_INIT_EDLC;
299 sregs->rw.wregs.control = sp->control;
300 sregs->rw.wregs.frame_gap = 0;
301 } else {
302 sregs->tstat = TSTAT_INIT_SEEQ;
303 }
304
305 hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc);
306 hregs->tx_ndptr = VIRT_TO_DMA(sp, sp->tx_desc);
307
308 seeq_go(sp, hregs, sregs);
309 return 0;
310 }
311
312 static void record_rx_errors(struct net_device *dev, unsigned char status)
313 {
314 if (status & SEEQ_RSTAT_OVERF ||
315 status & SEEQ_RSTAT_SFRAME)
316 dev->stats.rx_over_errors++;
317 if (status & SEEQ_RSTAT_CERROR)
318 dev->stats.rx_crc_errors++;
319 if (status & SEEQ_RSTAT_DERROR)
320 dev->stats.rx_frame_errors++;
321 if (status & SEEQ_RSTAT_REOF)
322 dev->stats.rx_errors++;
323 }
324
325 static inline void rx_maybe_restart(struct sgiseeq_private *sp,
326 struct hpc3_ethregs *hregs,
327 struct sgiseeq_regs *sregs)
328 {
329 if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
330 hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc + sp->rx_new);
331 seeq_go(sp, hregs, sregs);
332 }
333 }
334
335 static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
336 struct hpc3_ethregs *hregs,
337 struct sgiseeq_regs *sregs)
338 {
339 struct sgiseeq_rx_desc *rd;
340 struct sk_buff *skb = NULL;
341 struct sk_buff *newskb;
342 unsigned char pkt_status;
343 int len = 0;
344 unsigned int orig_end = PREV_RX(sp->rx_new);
345
346 /* Service every received packet. */
347 rd = &sp->rx_desc[sp->rx_new];
348 dma_sync_desc_cpu(dev, rd);
349 while (!(rd->rdma.cntinfo & HPCDMA_OWN)) {
350 len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
351 dma_unmap_single(dev->dev.parent, rd->rdma.pbuf,
352 PKT_BUF_SZ, DMA_FROM_DEVICE);
353 pkt_status = rd->skb->data[len];
354 if (pkt_status & SEEQ_RSTAT_FIG) {
355 /* Packet is OK. */
356 /* We don't want to receive our own packets */
357 if (memcmp(rd->skb->data + 6, dev->dev_addr, ETH_ALEN)) {
358 if (len > rx_copybreak) {
359 skb = rd->skb;
360 newskb = netdev_alloc_skb(dev, PKT_BUF_SZ);
361 if (!newskb) {
362 newskb = skb;
363 skb = NULL;
364 goto memory_squeeze;
365 }
366 skb_reserve(newskb, 2);
367 } else {
368 skb = netdev_alloc_skb(dev, len + 2);
369 if (skb) {
370 skb_reserve(skb, 2);
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 printk(KERN_NOTICE "%s: Memory squeeze, deferring packet.\n",
384 dev->name);
385 dev->stats.rx_dropped++;
386 }
387 } else {
388 /* Silently drop my own packets */
389 newskb = rd->skb;
390 }
391 } else {
392 record_rx_errors(dev, pkt_status);
393 newskb = rd->skb;
394 }
395 rd->skb = newskb;
396 rd->rdma.pbuf = dma_map_single(dev->dev.parent,
397 newskb->data - 2,
398 PKT_BUF_SZ, DMA_FROM_DEVICE);
399
400 /* Return the entry to the ring pool. */
401 rd->rdma.cntinfo = RCNTINFO_INIT;
402 sp->rx_new = NEXT_RX(sp->rx_new);
403 dma_sync_desc_dev(dev, rd);
404 rd = &sp->rx_desc[sp->rx_new];
405 dma_sync_desc_cpu(dev, rd);
406 }
407 dma_sync_desc_cpu(dev, &sp->rx_desc[orig_end]);
408 sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
409 dma_sync_desc_dev(dev, &sp->rx_desc[orig_end]);
410 dma_sync_desc_cpu(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
411 sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
412 dma_sync_desc_dev(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
413 rx_maybe_restart(sp, hregs, sregs);
414 }
415
416 static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
417 struct sgiseeq_regs *sregs)
418 {
419 if (sp->is_edlc) {
420 sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);
421 sregs->rw.wregs.control = sp->control;
422 }
423 }
424
425 static inline void kick_tx(struct net_device *dev,
426 struct sgiseeq_private *sp,
427 struct hpc3_ethregs *hregs)
428 {
429 struct sgiseeq_tx_desc *td;
430 int i = sp->tx_old;
431
432 /* If the HPC aint doin nothin, and there are more packets
433 * with ETXD cleared and XIU set we must make very certain
434 * that we restart the HPC else we risk locking up the
435 * adapter. The following code is only safe iff the HPCDMA
436 * is not active!
437 */
438 td = &sp->tx_desc[i];
439 dma_sync_desc_cpu(dev, td);
440 while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
441 (HPCDMA_XIU | HPCDMA_ETXD)) {
442 i = NEXT_TX(i);
443 td = &sp->tx_desc[i];
444 dma_sync_desc_cpu(dev, td);
445 }
446 if (td->tdma.cntinfo & HPCDMA_XIU) {
447 hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
448 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
449 }
450 }
451
452 static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,
453 struct hpc3_ethregs *hregs,
454 struct sgiseeq_regs *sregs)
455 {
456 struct sgiseeq_tx_desc *td;
457 unsigned long status = hregs->tx_ctrl;
458 int j;
459
460 tx_maybe_reset_collisions(sp, sregs);
461
462 if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {
463 /* Oops, HPC detected some sort of error. */
464 if (status & SEEQ_TSTAT_R16)
465 dev->stats.tx_aborted_errors++;
466 if (status & SEEQ_TSTAT_UFLOW)
467 dev->stats.tx_fifo_errors++;
468 if (status & SEEQ_TSTAT_LCLS)
469 dev->stats.collisions++;
470 }
471
472 /* Ack 'em... */
473 for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
474 td = &sp->tx_desc[j];
475
476 dma_sync_desc_cpu(dev, td);
477 if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
478 break;
479 if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
480 if (!(status & HPC3_ETXCTRL_ACTIVE)) {
481 hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
482 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
483 }
484 break;
485 }
486 dev->stats.tx_packets++;
487 sp->tx_old = NEXT_TX(sp->tx_old);
488 td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
489 td->tdma.cntinfo |= HPCDMA_EOX;
490 if (td->skb) {
491 dev_kfree_skb_any(td->skb);
492 td->skb = NULL;
493 }
494 dma_sync_desc_dev(dev, td);
495 }
496 }
497
498 static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id)
499 {
500 struct net_device *dev = (struct net_device *) dev_id;
501 struct sgiseeq_private *sp = netdev_priv(dev);
502 struct hpc3_ethregs *hregs = sp->hregs;
503 struct sgiseeq_regs *sregs = sp->sregs;
504
505 spin_lock(&sp->tx_lock);
506
507 /* Ack the IRQ and set software state. */
508 hregs->reset = HPC3_ERST_CLRIRQ;
509
510 /* Always check for received packets. */
511 sgiseeq_rx(dev, sp, hregs, sregs);
512
513 /* Only check for tx acks if we have something queued. */
514 if (sp->tx_old != sp->tx_new)
515 sgiseeq_tx(dev, sp, hregs, sregs);
516
517 if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {
518 netif_wake_queue(dev);
519 }
520 spin_unlock(&sp->tx_lock);
521
522 return IRQ_HANDLED;
523 }
524
525 static int sgiseeq_open(struct net_device *dev)
526 {
527 struct sgiseeq_private *sp = netdev_priv(dev);
528 struct sgiseeq_regs *sregs = sp->sregs;
529 unsigned int irq = dev->irq;
530 int err;
531
532 if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
533 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
534 err = -EAGAIN;
535 }
536
537 err = init_seeq(dev, sp, sregs);
538 if (err)
539 goto out_free_irq;
540
541 netif_start_queue(dev);
542
543 return 0;
544
545 out_free_irq:
546 free_irq(irq, dev);
547
548 return err;
549 }
550
551 static int sgiseeq_close(struct net_device *dev)
552 {
553 struct sgiseeq_private *sp = netdev_priv(dev);
554 struct sgiseeq_regs *sregs = sp->sregs;
555 unsigned int irq = dev->irq;
556
557 netif_stop_queue(dev);
558
559 /* Shutdown the Seeq. */
560 reset_hpc3_and_seeq(sp->hregs, sregs);
561 free_irq(irq, dev);
562 seeq_purge_ring(dev);
563
564 return 0;
565 }
566
567 static inline int sgiseeq_reset(struct net_device *dev)
568 {
569 struct sgiseeq_private *sp = netdev_priv(dev);
570 struct sgiseeq_regs *sregs = sp->sregs;
571 int err;
572
573 err = init_seeq(dev, sp, sregs);
574 if (err)
575 return err;
576
577 dev->trans_start = jiffies;
578 netif_wake_queue(dev);
579
580 return 0;
581 }
582
583 static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
584 {
585 struct sgiseeq_private *sp = netdev_priv(dev);
586 struct hpc3_ethregs *hregs = sp->hregs;
587 unsigned long flags;
588 struct sgiseeq_tx_desc *td;
589 int len, entry;
590
591 spin_lock_irqsave(&sp->tx_lock, flags);
592
593 /* Setup... */
594 len = skb->len;
595 if (len < ETH_ZLEN) {
596 if (skb_padto(skb, ETH_ZLEN))
597 return NETDEV_TX_OK;
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 dev->trans_start = jiffies;
640
641 if (!TX_BUFFS_AVAIL(sp))
642 netif_stop_queue(dev);
643 spin_unlock_irqrestore(&sp->tx_lock, flags);
644
645 return NETDEV_TX_OK;
646 }
647
648 static void timeout(struct net_device *dev)
649 {
650 printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);
651 sgiseeq_reset(dev);
652
653 dev->trans_start = jiffies;
654 netif_wake_queue(dev);
655 }
656
657 static void sgiseeq_set_multicast(struct net_device *dev)
658 {
659 struct sgiseeq_private *sp = netdev_priv(dev);
660 unsigned char oldmode = sp->mode;
661
662 if(dev->flags & IFF_PROMISC)
663 sp->mode = SEEQ_RCMD_RANY;
664 else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count)
665 sp->mode = SEEQ_RCMD_RBMCAST;
666 else
667 sp->mode = SEEQ_RCMD_RBCAST;
668
669 /* XXX I know this sucks, but is there a better way to reprogram
670 * XXX the receiver? At least, this shouldn't happen too often.
671 */
672
673 if (oldmode != sp->mode)
674 sgiseeq_reset(dev);
675 }
676
677 static inline void setup_tx_ring(struct net_device *dev,
678 struct sgiseeq_tx_desc *buf,
679 int nbufs)
680 {
681 struct sgiseeq_private *sp = netdev_priv(dev);
682 int i = 0;
683
684 while (i < (nbufs - 1)) {
685 buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
686 buf[i].tdma.pbuf = 0;
687 dma_sync_desc_dev(dev, &buf[i]);
688 i++;
689 }
690 buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf);
691 dma_sync_desc_dev(dev, &buf[i]);
692 }
693
694 static inline void setup_rx_ring(struct net_device *dev,
695 struct sgiseeq_rx_desc *buf,
696 int nbufs)
697 {
698 struct sgiseeq_private *sp = netdev_priv(dev);
699 int i = 0;
700
701 while (i < (nbufs - 1)) {
702 buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
703 buf[i].rdma.pbuf = 0;
704 dma_sync_desc_dev(dev, &buf[i]);
705 i++;
706 }
707 buf[i].rdma.pbuf = 0;
708 buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf);
709 dma_sync_desc_dev(dev, &buf[i]);
710 }
711
712 static const struct net_device_ops sgiseeq_netdev_ops = {
713 .ndo_open = sgiseeq_open,
714 .ndo_stop = sgiseeq_close,
715 .ndo_start_xmit = sgiseeq_start_xmit,
716 .ndo_tx_timeout = timeout,
717 .ndo_set_multicast_list = sgiseeq_set_multicast,
718 .ndo_set_mac_address = sgiseeq_set_mac_address,
719 .ndo_change_mtu = eth_change_mtu,
720 .ndo_validate_addr = eth_validate_addr,
721 };
722
723 static int __devinit sgiseeq_probe(struct platform_device *pdev)
724 {
725 struct sgiseeq_platform_data *pd = pdev->dev.platform_data;
726 struct hpc3_regs *hpcregs = pd->hpc;
727 struct sgiseeq_init_block *sr;
728 unsigned int irq = pd->irq;
729 struct sgiseeq_private *sp;
730 struct net_device *dev;
731 int err;
732
733 dev = alloc_etherdev(sizeof (struct sgiseeq_private));
734 if (!dev) {
735 printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n");
736 err = -ENOMEM;
737 goto err_out;
738 }
739
740 platform_set_drvdata(pdev, dev);
741 sp = netdev_priv(dev);
742
743 /* Make private data page aligned */
744 sr = dma_alloc_noncoherent(&pdev->dev, sizeof(*sp->srings),
745 &sp->srings_dma, GFP_KERNEL);
746 if (!sr) {
747 printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
748 err = -ENOMEM;
749 goto err_out_free_dev;
750 }
751 sp->srings = sr;
752 sp->rx_desc = sp->srings->rxvector;
753 sp->tx_desc = sp->srings->txvector;
754
755 /* A couple calculations now, saves many cycles later. */
756 setup_rx_ring(dev, sp->rx_desc, SEEQ_RX_BUFFERS);
757 setup_tx_ring(dev, sp->tx_desc, SEEQ_TX_BUFFERS);
758
759 memcpy(dev->dev_addr, pd->mac, ETH_ALEN);
760
761 #ifdef DEBUG
762 gpriv = sp;
763 gdev = dev;
764 #endif
765 sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0];
766 sp->hregs = &hpcregs->ethregs;
767 sp->name = sgiseeqstr;
768 sp->mode = SEEQ_RCMD_RBCAST;
769
770 /* Setup PIO and DMA transfer timing */
771 sp->hregs->pconfig = 0x161;
772 sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
773 HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
774
775 /* Setup PIO and DMA transfer timing */
776 sp->hregs->pconfig = 0x161;
777 sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
778 HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
779
780 /* Reset the chip. */
781 hpc3_eth_reset(sp->hregs);
782
783 sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
784 if (sp->is_edlc)
785 sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
786 SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
787 SEEQ_CTRL_ENCARR;
788
789 dev->netdev_ops = &sgiseeq_netdev_ops;
790 dev->watchdog_timeo = (200 * HZ) / 1000;
791 dev->irq = irq;
792
793 if (register_netdev(dev)) {
794 printk(KERN_ERR "Sgiseeq: Cannot register net device, "
795 "aborting.\n");
796 err = -ENODEV;
797 goto err_out_free_page;
798 }
799
800 printk(KERN_INFO "%s: %s %pM\n", dev->name, sgiseeqstr, dev->dev_addr);
801
802 return 0;
803
804 err_out_free_page:
805 free_page((unsigned long) sp->srings);
806 err_out_free_dev:
807 kfree(dev);
808
809 err_out:
810 return err;
811 }
812
813 static int __exit sgiseeq_remove(struct platform_device *pdev)
814 {
815 struct net_device *dev = platform_get_drvdata(pdev);
816 struct sgiseeq_private *sp = netdev_priv(dev);
817
818 unregister_netdev(dev);
819 dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings,
820 sp->srings_dma);
821 free_netdev(dev);
822 platform_set_drvdata(pdev, NULL);
823
824 return 0;
825 }
826
827 static struct platform_driver sgiseeq_driver = {
828 .probe = sgiseeq_probe,
829 .remove = __exit_p(sgiseeq_remove),
830 .driver = {
831 .name = "sgiseeq",
832 .owner = THIS_MODULE,
833 }
834 };
835
836 static int __init sgiseeq_module_init(void)
837 {
838 if (platform_driver_register(&sgiseeq_driver)) {
839 printk(KERN_ERR "Driver registration failed\n");
840 return -ENODEV;
841 }
842
843 return 0;
844 }
845
846 static void __exit sgiseeq_module_exit(void)
847 {
848 platform_driver_unregister(&sgiseeq_driver);
849 }
850
851 module_init(sgiseeq_module_init);
852 module_exit(sgiseeq_module_exit);
853
854 MODULE_DESCRIPTION("SGI Seeq 8003 driver");
855 MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>");
856 MODULE_LICENSE("GPL");
857 MODULE_ALIAS("platform:sgiseeq");
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