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1// SPDX-License-Identifier: GPL-2.0-only
2/* drivers/atm/eni.c - Efficient Networks ENI155P device driver */
3
4/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
5
6
7#include <linux/module.h>
8#include <linux/kernel.h>
9#include <linux/mm.h>
10#include <linux/pci.h>
11#include <linux/errno.h>
12#include <linux/atm.h>
13#include <linux/atmdev.h>
14#include <linux/sonet.h>
15#include <linux/skbuff.h>
16#include <linux/time.h>
17#include <linux/delay.h>
18#include <linux/uio.h>
19#include <linux/init.h>
20#include <linux/atm_eni.h>
21#include <linux/bitops.h>
22#include <linux/slab.h>
23#include <asm/io.h>
24#include <linux/atomic.h>
25#include <linux/uaccess.h>
26#include <asm/string.h>
27#include <asm/byteorder.h>
28
29#include "tonga.h"
30#include "midway.h"
31#include "suni.h"
32#include "eni.h"
33
34/*
35 * TODO:
36 *
37 * Show stoppers
38 * none
39 *
40 * Minor
41 * - OAM support
42 * - fix bugs listed below
43 */
44
45/*
46 * KNOWN BUGS:
47 *
48 * - may run into JK-JK bug and deadlock
49 * - should allocate UBR channel first
50 * - buffer space allocation algorithm is stupid
51 * (RX: should be maxSDU+maxdelay*rate
52 * TX: should be maxSDU+min(maxSDU,maxdelay*rate) )
53 * - doesn't support OAM cells
54 * - eni_put_free may hang if not putting memory fragments that _complete_
55 * 2^n block (never happens in real life, though)
56 */
57
58
59#if 0
60#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
61#else
62#define DPRINTK(format,args...)
63#endif
64
65
66#ifndef CONFIG_ATM_ENI_TUNE_BURST
67#define CONFIG_ATM_ENI_BURST_TX_8W
68#define CONFIG_ATM_ENI_BURST_RX_4W
69#endif
70
71
72#ifndef CONFIG_ATM_ENI_DEBUG
73
74
75#define NULLCHECK(x)
76
77#define EVENT(s,a,b)
78
79
80static void event_dump(void)
81{
82}
83
84
85#else
86
87
88/*
89 * NULL pointer checking
90 */
91
92#define NULLCHECK(x) \
93 if ((unsigned long) (x) < 0x30) \
94 printk(KERN_CRIT #x "==0x%lx\n",(unsigned long) (x))
95
96/*
97 * Very extensive activity logging. Greatly improves bug detection speed but
98 * costs a few Mbps if enabled.
99 */
100
101#define EV 64
102
103static const char *ev[EV];
104static unsigned long ev_a[EV],ev_b[EV];
105static int ec = 0;
106
107
108static void EVENT(const char *s,unsigned long a,unsigned long b)
109{
110 ev[ec] = s;
111 ev_a[ec] = a;
112 ev_b[ec] = b;
113 ec = (ec+1) % EV;
114}
115
116
117static void event_dump(void)
118{
119 int n,i;
120
121 for (n = 0; n < EV; n++) {
122 i = (ec+n) % EV;
123 printk(KERN_NOTICE);
124 printk(ev[i] ? ev[i] : "(null)",ev_a[i],ev_b[i]);
125 }
126}
127
128
129#endif /* CONFIG_ATM_ENI_DEBUG */
130
131
132/*
133 * NExx must not be equal at end
134 * EExx may be equal at end
135 * xxPJOK verify validity of pointer jumps
136 * xxPMOK operating on a circular buffer of "c" words
137 */
138
139#define NEPJOK(a0,a1,b) \
140 ((a0) < (a1) ? (b) <= (a0) || (b) > (a1) : (b) <= (a0) && (b) > (a1))
141#define EEPJOK(a0,a1,b) \
142 ((a0) < (a1) ? (b) < (a0) || (b) >= (a1) : (b) < (a0) && (b) >= (a1))
143#define NEPMOK(a0,d,b,c) NEPJOK(a0,(a0+d) & (c-1),b)
144#define EEPMOK(a0,d,b,c) EEPJOK(a0,(a0+d) & (c-1),b)
145
146
147static int tx_complete = 0,dma_complete = 0,queued = 0,requeued = 0,
148 backlogged = 0,rx_enqueued = 0,rx_dequeued = 0,pushed = 0,submitted = 0,
149 putting = 0;
150
151static struct atm_dev *eni_boards = NULL;
152
153/* Read/write registers on card */
154#define eni_in(r) readl(eni_dev->reg+(r)*4)
155#define eni_out(v,r) writel((v),eni_dev->reg+(r)*4)
156
157
158/*-------------------------------- utilities --------------------------------*/
159
160
161static void dump_mem(struct eni_dev *eni_dev)
162{
163 int i;
164
165 for (i = 0; i < eni_dev->free_len; i++)
166 printk(KERN_DEBUG " %d: %p %d\n",i,
167 eni_dev->free_list[i].start,
168 1 << eni_dev->free_list[i].order);
169}
170
171
172static void dump(struct atm_dev *dev)
173{
174 struct eni_dev *eni_dev;
175
176 int i;
177
178 eni_dev = ENI_DEV(dev);
179 printk(KERN_NOTICE "Free memory\n");
180 dump_mem(eni_dev);
181 printk(KERN_NOTICE "TX buffers\n");
182 for (i = 0; i < NR_CHAN; i++)
183 if (eni_dev->tx[i].send)
184 printk(KERN_NOTICE " TX %d @ %p: %ld\n",i,
185 eni_dev->tx[i].send,eni_dev->tx[i].words*4);
186 printk(KERN_NOTICE "RX buffers\n");
187 for (i = 0; i < 1024; i++)
188 if (eni_dev->rx_map[i] && ENI_VCC(eni_dev->rx_map[i])->rx)
189 printk(KERN_NOTICE " RX %d @ %p: %ld\n",i,
190 ENI_VCC(eni_dev->rx_map[i])->recv,
191 ENI_VCC(eni_dev->rx_map[i])->words*4);
192 printk(KERN_NOTICE "----\n");
193}
194
195
196static void eni_put_free(struct eni_dev *eni_dev, void __iomem *start,
197 unsigned long size)
198{
199 struct eni_free *list;
200 int len,order;
201
202 DPRINTK("init 0x%lx+%ld(0x%lx)\n",start,size,size);
203 start += eni_dev->base_diff;
204 list = eni_dev->free_list;
205 len = eni_dev->free_len;
206 while (size) {
207 if (len >= eni_dev->free_list_size) {
208 printk(KERN_CRIT "eni_put_free overflow (%p,%ld)\n",
209 start,size);
210 break;
211 }
212 for (order = 0; !(((unsigned long)start | size) & (1 << order)); order++);
213 if (MID_MIN_BUF_SIZE > (1 << order)) {
214 printk(KERN_CRIT "eni_put_free: order %d too small\n",
215 order);
216 break;
217 }
218 list[len].start = (void __iomem *) start;
219 list[len].order = order;
220 len++;
221 start += 1 << order;
222 size -= 1 << order;
223 }
224 eni_dev->free_len = len;
225 /*dump_mem(eni_dev);*/
226}
227
228
229static void __iomem *eni_alloc_mem(struct eni_dev *eni_dev, unsigned long *size)
230{
231 struct eni_free *list;
232 void __iomem *start;
233 int len,i,order,best_order,index;
234
235 list = eni_dev->free_list;
236 len = eni_dev->free_len;
237 if (*size < MID_MIN_BUF_SIZE) *size = MID_MIN_BUF_SIZE;
238 if (*size > MID_MAX_BUF_SIZE) return NULL;
239 for (order = 0; (1 << order) < *size; order++)
240 ;
241 DPRINTK("trying: %ld->%d\n",*size,order);
242 best_order = 65; /* we don't have more than 2^64 of anything ... */
243 index = 0; /* silence GCC */
244 for (i = 0; i < len; i++)
245 if (list[i].order == order) {
246 best_order = order;
247 index = i;
248 break;
249 }
250 else if (best_order > list[i].order && list[i].order > order) {
251 best_order = list[i].order;
252 index = i;
253 }
254 if (best_order == 65) return NULL;
255 start = list[index].start-eni_dev->base_diff;
256 list[index] = list[--len];
257 eni_dev->free_len = len;
258 *size = 1 << order;
259 eni_put_free(eni_dev,start+*size,(1 << best_order)-*size);
260 DPRINTK("%ld bytes (order %d) at 0x%lx\n",*size,order,start);
261 memset_io(start,0,*size); /* never leak data */
262 /*dump_mem(eni_dev);*/
263 return start;
264}
265
266
267static void eni_free_mem(struct eni_dev *eni_dev, void __iomem *start,
268 unsigned long size)
269{
270 struct eni_free *list;
271 int len,i,order;
272
273 start += eni_dev->base_diff;
274 list = eni_dev->free_list;
275 len = eni_dev->free_len;
276 for (order = -1; size; order++) size >>= 1;
277 DPRINTK("eni_free_mem: %p+0x%lx (order %d)\n",start,size,order);
278 for (i = 0; i < len; i++)
279 if (((unsigned long) list[i].start) == ((unsigned long)start^(1 << order)) &&
280 list[i].order == order) {
281 DPRINTK("match[%d]: 0x%lx/0x%lx(0x%x), %d/%d\n",i,
282 list[i].start,start,1 << order,list[i].order,order);
283 list[i] = list[--len];
284 start = (void __iomem *) ((unsigned long) start & ~(unsigned long) (1 << order));
285 order++;
286 i = -1;
287 continue;
288 }
289 if (len >= eni_dev->free_list_size) {
290 printk(KERN_ALERT "eni_free_mem overflow (%p,%d)\n",start,
291 order);
292 return;
293 }
294 list[len].start = start;
295 list[len].order = order;
296 eni_dev->free_len = len+1;
297 /*dump_mem(eni_dev);*/
298}
299
300
301/*----------------------------------- RX ------------------------------------*/
302
303
304#define ENI_VCC_NOS ((struct atm_vcc *) 1)
305
306
307static void rx_ident_err(struct atm_vcc *vcc)
308{
309 struct atm_dev *dev;
310 struct eni_dev *eni_dev;
311 struct eni_vcc *eni_vcc;
312
313 dev = vcc->dev;
314 eni_dev = ENI_DEV(dev);
315 /* immediately halt adapter */
316 eni_out(eni_in(MID_MC_S) &
317 ~(MID_DMA_ENABLE | MID_TX_ENABLE | MID_RX_ENABLE),MID_MC_S);
318 /* dump useful information */
319 eni_vcc = ENI_VCC(vcc);
320 printk(KERN_ALERT DEV_LABEL "(itf %d): driver error - RX ident "
321 "mismatch\n",dev->number);
322 printk(KERN_ALERT " VCI %d, rxing %d, words %ld\n",vcc->vci,
323 eni_vcc->rxing,eni_vcc->words);
324 printk(KERN_ALERT " host descr 0x%lx, rx pos 0x%lx, descr value "
325 "0x%x\n",eni_vcc->descr,eni_vcc->rx_pos,
326 (unsigned) readl(eni_vcc->recv+eni_vcc->descr*4));
327 printk(KERN_ALERT " last %p, servicing %d\n",eni_vcc->last,
328 eni_vcc->servicing);
329 EVENT("---dump ends here---\n",0,0);
330 printk(KERN_NOTICE "---recent events---\n");
331 event_dump();
332 ENI_DEV(dev)->fast = NULL; /* really stop it */
333 ENI_DEV(dev)->slow = NULL;
334 skb_queue_head_init(&ENI_DEV(dev)->rx_queue);
335}
336
337
338static int do_rx_dma(struct atm_vcc *vcc,struct sk_buff *skb,
339 unsigned long skip,unsigned long size,unsigned long eff)
340{
341 struct eni_dev *eni_dev;
342 struct eni_vcc *eni_vcc;
343 u32 dma_rd,dma_wr;
344 u32 dma[RX_DMA_BUF*2];
345 dma_addr_t paddr;
346 unsigned long here;
347 int i,j;
348
349 eni_dev = ENI_DEV(vcc->dev);
350 eni_vcc = ENI_VCC(vcc);
351 paddr = 0; /* GCC, shut up */
352 if (skb) {
353 paddr = dma_map_single(&eni_dev->pci_dev->dev,skb->data,skb->len,
354 DMA_FROM_DEVICE);
355 if (dma_mapping_error(&eni_dev->pci_dev->dev, paddr))
356 goto dma_map_error;
357 ENI_PRV_PADDR(skb) = paddr;
358 if (paddr & 3)
359 printk(KERN_CRIT DEV_LABEL "(itf %d): VCI %d has "
360 "mis-aligned RX data (0x%lx)\n",vcc->dev->number,
361 vcc->vci,(unsigned long) paddr);
362 ENI_PRV_SIZE(skb) = size+skip;
363 /* PDU plus descriptor */
364 ATM_SKB(skb)->vcc = vcc;
365 }
366 j = 0;
367 if ((eff && skip) || 1) { /* @@@ actually, skip is always == 1 ... */
368 here = (eni_vcc->descr+skip) & (eni_vcc->words-1);
369 dma[j++] = (here << MID_DMA_COUNT_SHIFT) | (vcc->vci
370 << MID_DMA_VCI_SHIFT) | MID_DT_JK;
371 dma[j++] = 0;
372 }
373 here = (eni_vcc->descr+size+skip) & (eni_vcc->words-1);
374 if (!eff) size += skip;
375 else {
376 unsigned long words;
377
378 if (!size) {
379 DPRINTK("strange things happen ...\n");
380 EVENT("strange things happen ... (skip=%ld,eff=%ld)\n",
381 size,eff);
382 }
383 words = eff;
384 if (paddr & 15) {
385 unsigned long init;
386
387 init = 4-((paddr & 15) >> 2);
388 if (init > words) init = words;
389 dma[j++] = MID_DT_WORD | (init << MID_DMA_COUNT_SHIFT) |
390 (vcc->vci << MID_DMA_VCI_SHIFT);
391 dma[j++] = paddr;
392 paddr += init << 2;
393 words -= init;
394 }
395#ifdef CONFIG_ATM_ENI_BURST_RX_16W /* may work with some PCI chipsets ... */
396 if (words & ~15) {
397 dma[j++] = MID_DT_16W | ((words >> 4) <<
398 MID_DMA_COUNT_SHIFT) | (vcc->vci <<
399 MID_DMA_VCI_SHIFT);
400 dma[j++] = paddr;
401 paddr += (words & ~15) << 2;
402 words &= 15;
403 }
404#endif
405#ifdef CONFIG_ATM_ENI_BURST_RX_8W /* works only with *some* PCI chipsets ... */
406 if (words & ~7) {
407 dma[j++] = MID_DT_8W | ((words >> 3) <<
408 MID_DMA_COUNT_SHIFT) | (vcc->vci <<
409 MID_DMA_VCI_SHIFT);
410 dma[j++] = paddr;
411 paddr += (words & ~7) << 2;
412 words &= 7;
413 }
414#endif
415#ifdef CONFIG_ATM_ENI_BURST_RX_4W /* recommended */
416 if (words & ~3) {
417 dma[j++] = MID_DT_4W | ((words >> 2) <<
418 MID_DMA_COUNT_SHIFT) | (vcc->vci <<
419 MID_DMA_VCI_SHIFT);
420 dma[j++] = paddr;
421 paddr += (words & ~3) << 2;
422 words &= 3;
423 }
424#endif
425#ifdef CONFIG_ATM_ENI_BURST_RX_2W /* probably useless if RX_4W, RX_8W, ... */
426 if (words & ~1) {
427 dma[j++] = MID_DT_2W | ((words >> 1) <<
428 MID_DMA_COUNT_SHIFT) | (vcc->vci <<
429 MID_DMA_VCI_SHIFT);
430 dma[j++] = paddr;
431 paddr += (words & ~1) << 2;
432 words &= 1;
433 }
434#endif
435 if (words) {
436 dma[j++] = MID_DT_WORD | (words << MID_DMA_COUNT_SHIFT)
437 | (vcc->vci << MID_DMA_VCI_SHIFT);
438 dma[j++] = paddr;
439 }
440 }
441 if (size != eff) {
442 dma[j++] = (here << MID_DMA_COUNT_SHIFT) |
443 (vcc->vci << MID_DMA_VCI_SHIFT) | MID_DT_JK;
444 dma[j++] = 0;
445 }
446 if (!j || j > 2*RX_DMA_BUF) {
447 printk(KERN_CRIT DEV_LABEL "!j or j too big!!!\n");
448 goto trouble;
449 }
450 dma[j-2] |= MID_DMA_END;
451 j = j >> 1;
452 dma_wr = eni_in(MID_DMA_WR_RX);
453 dma_rd = eni_in(MID_DMA_RD_RX);
454 /*
455 * Can I move the dma_wr pointer by 2j+1 positions without overwriting
456 * data that hasn't been read (position of dma_rd) yet ?
457 */
458 if (!NEPMOK(dma_wr,j+j+1,dma_rd,NR_DMA_RX)) { /* @@@ +1 is ugly */
459 printk(KERN_WARNING DEV_LABEL "(itf %d): RX DMA full\n",
460 vcc->dev->number);
461 goto trouble;
462 }
463 for (i = 0; i < j; i++) {
464 writel(dma[i*2],eni_dev->rx_dma+dma_wr*8);
465 writel(dma[i*2+1],eni_dev->rx_dma+dma_wr*8+4);
466 dma_wr = (dma_wr+1) & (NR_DMA_RX-1);
467 }
468 if (skb) {
469 ENI_PRV_POS(skb) = eni_vcc->descr+size+1;
470 skb_queue_tail(&eni_dev->rx_queue,skb);
471 eni_vcc->last = skb;
472 rx_enqueued++;
473 }
474 eni_vcc->descr = here;
475 eni_out(dma_wr,MID_DMA_WR_RX);
476 return 0;
477
478trouble:
479 if (paddr)
480 dma_unmap_single(&eni_dev->pci_dev->dev,paddr,skb->len,
481 DMA_FROM_DEVICE);
482dma_map_error:
483 if (skb) dev_kfree_skb_irq(skb);
484 return -1;
485}
486
487
488static void discard(struct atm_vcc *vcc,unsigned long size)
489{
490 struct eni_vcc *eni_vcc;
491
492 eni_vcc = ENI_VCC(vcc);
493 EVENT("discard (size=%ld)\n",size,0);
494 while (do_rx_dma(vcc,NULL,1,size,0)) EVENT("BUSY LOOP",0,0);
495 /* could do a full fallback, but that might be more expensive */
496 if (eni_vcc->rxing) ENI_PRV_POS(eni_vcc->last) += size+1;
497 else eni_vcc->rx_pos = (eni_vcc->rx_pos+size+1) & (eni_vcc->words-1);
498}
499
500
501/*
502 * TODO: should check whether direct copies (without DMA setup, dequeuing on
503 * interrupt, etc.) aren't much faster for AAL0
504 */
505
506static int rx_aal0(struct atm_vcc *vcc)
507{
508 struct eni_vcc *eni_vcc;
509 unsigned long descr;
510 unsigned long length;
511 struct sk_buff *skb;
512
513 DPRINTK(">rx_aal0\n");
514 eni_vcc = ENI_VCC(vcc);
515 descr = readl(eni_vcc->recv+eni_vcc->descr*4);
516 if ((descr & MID_RED_IDEN) != (MID_RED_RX_ID << MID_RED_SHIFT)) {
517 rx_ident_err(vcc);
518 return 1;
519 }
520 if (descr & MID_RED_T) {
521 DPRINTK(DEV_LABEL "(itf %d): trashing empty cell\n",
522 vcc->dev->number);
523 length = 0;
524 atomic_inc(&vcc->stats->rx_err);
525 }
526 else {
527 length = ATM_CELL_SIZE-1; /* no HEC */
528 }
529 skb = length ? atm_alloc_charge(vcc,length,GFP_ATOMIC) : NULL;
530 if (!skb) {
531 discard(vcc,length >> 2);
532 return 0;
533 }
534 skb_put(skb,length);
535 skb->tstamp = eni_vcc->timestamp;
536 DPRINTK("got len %ld\n",length);
537 if (do_rx_dma(vcc,skb,1,length >> 2,length >> 2)) return 1;
538 eni_vcc->rxing++;
539 return 0;
540}
541
542
543static int rx_aal5(struct atm_vcc *vcc)
544{
545 struct eni_vcc *eni_vcc;
546 unsigned long descr;
547 unsigned long size,eff,length;
548 struct sk_buff *skb;
549
550 EVENT("rx_aal5\n",0,0);
551 DPRINTK(">rx_aal5\n");
552 eni_vcc = ENI_VCC(vcc);
553 descr = readl(eni_vcc->recv+eni_vcc->descr*4);
554 if ((descr & MID_RED_IDEN) != (MID_RED_RX_ID << MID_RED_SHIFT)) {
555 rx_ident_err(vcc);
556 return 1;
557 }
558 if (descr & (MID_RED_T | MID_RED_CRC_ERR)) {
559 if (descr & MID_RED_T) {
560 EVENT("empty cell (descr=0x%lx)\n",descr,0);
561 DPRINTK(DEV_LABEL "(itf %d): trashing empty cell\n",
562 vcc->dev->number);
563 size = 0;
564 }
565 else {
566 static unsigned long silence = 0;
567
568 if (time_after(jiffies, silence) || silence == 0) {
569 printk(KERN_WARNING DEV_LABEL "(itf %d): "
570 "discarding PDU(s) with CRC error\n",
571 vcc->dev->number);
572 silence = (jiffies+2*HZ)|1;
573 }
574 size = (descr & MID_RED_COUNT)*(ATM_CELL_PAYLOAD >> 2);
575 EVENT("CRC error (descr=0x%lx,size=%ld)\n",descr,
576 size);
577 }
578 eff = length = 0;
579 atomic_inc(&vcc->stats->rx_err);
580 }
581 else {
582 size = (descr & MID_RED_COUNT)*(ATM_CELL_PAYLOAD >> 2);
583 DPRINTK("size=%ld\n",size);
584 length = readl(eni_vcc->recv+(((eni_vcc->descr+size-1) &
585 (eni_vcc->words-1)))*4) & 0xffff;
586 /* -trailer(2)+header(1) */
587 if (length && length <= (size << 2)-8 && length <=
588 ATM_MAX_AAL5_PDU) eff = (length+3) >> 2;
589 else { /* ^ trailer length (8) */
590 EVENT("bad PDU (descr=0x08%lx,length=%ld)\n",descr,
591 length);
592 printk(KERN_ERR DEV_LABEL "(itf %d): bad AAL5 PDU "
593 "(VCI=%d,length=%ld,size=%ld (descr 0x%lx))\n",
594 vcc->dev->number,vcc->vci,length,size << 2,descr);
595 length = eff = 0;
596 atomic_inc(&vcc->stats->rx_err);
597 }
598 }
599 skb = eff ? atm_alloc_charge(vcc,eff << 2,GFP_ATOMIC) : NULL;
600 if (!skb) {
601 discard(vcc,size);
602 return 0;
603 }
604 skb_put(skb,length);
605 DPRINTK("got len %ld\n",length);
606 if (do_rx_dma(vcc,skb,1,size,eff)) return 1;
607 eni_vcc->rxing++;
608 return 0;
609}
610
611
612static inline int rx_vcc(struct atm_vcc *vcc)
613{
614 void __iomem *vci_dsc;
615 unsigned long tmp;
616 struct eni_vcc *eni_vcc;
617
618 eni_vcc = ENI_VCC(vcc);
619 vci_dsc = ENI_DEV(vcc->dev)->vci+vcc->vci*16;
620 EVENT("rx_vcc(1)\n",0,0);
621 while (eni_vcc->descr != (tmp = (readl(vci_dsc+4) & MID_VCI_DESCR) >>
622 MID_VCI_DESCR_SHIFT)) {
623 EVENT("rx_vcc(2: host dsc=0x%lx, nic dsc=0x%lx)\n",
624 eni_vcc->descr,tmp);
625 DPRINTK("CB_DESCR %ld REG_DESCR %d\n",ENI_VCC(vcc)->descr,
626 (((unsigned) readl(vci_dsc+4) & MID_VCI_DESCR) >>
627 MID_VCI_DESCR_SHIFT));
628 if (ENI_VCC(vcc)->rx(vcc)) return 1;
629 }
630 /* clear IN_SERVICE flag */
631 writel(readl(vci_dsc) & ~MID_VCI_IN_SERVICE,vci_dsc);
632 /*
633 * If new data has arrived between evaluating the while condition and
634 * clearing IN_SERVICE, we wouldn't be notified until additional data
635 * follows. So we have to loop again to be sure.
636 */
637 EVENT("rx_vcc(3)\n",0,0);
638 while (ENI_VCC(vcc)->descr != (tmp = (readl(vci_dsc+4) & MID_VCI_DESCR)
639 >> MID_VCI_DESCR_SHIFT)) {
640 EVENT("rx_vcc(4: host dsc=0x%lx, nic dsc=0x%lx)\n",
641 eni_vcc->descr,tmp);
642 DPRINTK("CB_DESCR %ld REG_DESCR %d\n",ENI_VCC(vcc)->descr,
643 (((unsigned) readl(vci_dsc+4) & MID_VCI_DESCR) >>
644 MID_VCI_DESCR_SHIFT));
645 if (ENI_VCC(vcc)->rx(vcc)) return 1;
646 }
647 return 0;
648}
649
650
651static void poll_rx(struct atm_dev *dev)
652{
653 struct eni_dev *eni_dev;
654 struct atm_vcc *curr;
655
656 eni_dev = ENI_DEV(dev);
657 while ((curr = eni_dev->fast)) {
658 EVENT("poll_rx.fast\n",0,0);
659 if (rx_vcc(curr)) return;
660 eni_dev->fast = ENI_VCC(curr)->next;
661 ENI_VCC(curr)->next = ENI_VCC_NOS;
662 barrier();
663 ENI_VCC(curr)->servicing--;
664 }
665 while ((curr = eni_dev->slow)) {
666 EVENT("poll_rx.slow\n",0,0);
667 if (rx_vcc(curr)) return;
668 eni_dev->slow = ENI_VCC(curr)->next;
669 ENI_VCC(curr)->next = ENI_VCC_NOS;
670 barrier();
671 ENI_VCC(curr)->servicing--;
672 }
673}
674
675
676static void get_service(struct atm_dev *dev)
677{
678 struct eni_dev *eni_dev;
679 struct atm_vcc *vcc;
680 unsigned long vci;
681
682 DPRINTK(">get_service\n");
683 eni_dev = ENI_DEV(dev);
684 while (eni_in(MID_SERV_WRITE) != eni_dev->serv_read) {
685 vci = readl(eni_dev->service+eni_dev->serv_read*4);
686 eni_dev->serv_read = (eni_dev->serv_read+1) & (NR_SERVICE-1);
687 vcc = eni_dev->rx_map[vci & 1023];
688 if (!vcc) {
689 printk(KERN_CRIT DEV_LABEL "(itf %d): VCI %ld not "
690 "found\n",dev->number,vci);
691 continue; /* nasty but we try to go on anyway */
692 /* @@@ nope, doesn't work */
693 }
694 EVENT("getting from service\n",0,0);
695 if (ENI_VCC(vcc)->next != ENI_VCC_NOS) {
696 EVENT("double service\n",0,0);
697 DPRINTK("Grr, servicing VCC %ld twice\n",vci);
698 continue;
699 }
700 ENI_VCC(vcc)->timestamp = ktime_get_real();
701 ENI_VCC(vcc)->next = NULL;
702 if (vcc->qos.rxtp.traffic_class == ATM_CBR) {
703 if (eni_dev->fast)
704 ENI_VCC(eni_dev->last_fast)->next = vcc;
705 else eni_dev->fast = vcc;
706 eni_dev->last_fast = vcc;
707 }
708 else {
709 if (eni_dev->slow)
710 ENI_VCC(eni_dev->last_slow)->next = vcc;
711 else eni_dev->slow = vcc;
712 eni_dev->last_slow = vcc;
713 }
714 putting++;
715 ENI_VCC(vcc)->servicing++;
716 }
717}
718
719
720static void dequeue_rx(struct atm_dev *dev)
721{
722 struct eni_dev *eni_dev;
723 struct eni_vcc *eni_vcc;
724 struct atm_vcc *vcc;
725 struct sk_buff *skb;
726 void __iomem *vci_dsc;
727 int first;
728
729 eni_dev = ENI_DEV(dev);
730 first = 1;
731 while (1) {
732 skb = skb_dequeue(&eni_dev->rx_queue);
733 if (!skb) {
734 if (first) {
735 DPRINTK(DEV_LABEL "(itf %d): RX but not "
736 "rxing\n",dev->number);
737 EVENT("nothing to dequeue\n",0,0);
738 }
739 break;
740 }
741 EVENT("dequeued (size=%ld,pos=0x%lx)\n",ENI_PRV_SIZE(skb),
742 ENI_PRV_POS(skb));
743 rx_dequeued++;
744 vcc = ATM_SKB(skb)->vcc;
745 eni_vcc = ENI_VCC(vcc);
746 first = 0;
747 vci_dsc = eni_dev->vci+vcc->vci*16;
748 if (!EEPMOK(eni_vcc->rx_pos,ENI_PRV_SIZE(skb),
749 (readl(vci_dsc+4) & MID_VCI_READ) >> MID_VCI_READ_SHIFT,
750 eni_vcc->words)) {
751 EVENT("requeuing\n",0,0);
752 skb_queue_head(&eni_dev->rx_queue,skb);
753 break;
754 }
755 eni_vcc->rxing--;
756 eni_vcc->rx_pos = ENI_PRV_POS(skb) & (eni_vcc->words-1);
757 dma_unmap_single(&eni_dev->pci_dev->dev,ENI_PRV_PADDR(skb),skb->len,
758 DMA_TO_DEVICE);
759 if (!skb->len) dev_kfree_skb_irq(skb);
760 else {
761 EVENT("pushing (len=%ld)\n",skb->len,0);
762 if (vcc->qos.aal == ATM_AAL0)
763 *(unsigned long *) skb->data =
764 ntohl(*(unsigned long *) skb->data);
765 memset(skb->cb,0,sizeof(struct eni_skb_prv));
766 vcc->push(vcc,skb);
767 pushed++;
768 }
769 atomic_inc(&vcc->stats->rx);
770 }
771 wake_up(&eni_dev->rx_wait);
772}
773
774
775static int open_rx_first(struct atm_vcc *vcc)
776{
777 struct eni_dev *eni_dev;
778 struct eni_vcc *eni_vcc;
779 unsigned long size;
780
781 DPRINTK("open_rx_first\n");
782 eni_dev = ENI_DEV(vcc->dev);
783 eni_vcc = ENI_VCC(vcc);
784 eni_vcc->rx = NULL;
785 if (vcc->qos.rxtp.traffic_class == ATM_NONE) return 0;
786 size = vcc->qos.rxtp.max_sdu*eni_dev->rx_mult/100;
787 if (size > MID_MAX_BUF_SIZE && vcc->qos.rxtp.max_sdu <=
788 MID_MAX_BUF_SIZE)
789 size = MID_MAX_BUF_SIZE;
790 eni_vcc->recv = eni_alloc_mem(eni_dev,&size);
791 DPRINTK("rx at 0x%lx\n",eni_vcc->recv);
792 eni_vcc->words = size >> 2;
793 if (!eni_vcc->recv) return -ENOBUFS;
794 eni_vcc->rx = vcc->qos.aal == ATM_AAL5 ? rx_aal5 : rx_aal0;
795 eni_vcc->descr = 0;
796 eni_vcc->rx_pos = 0;
797 eni_vcc->rxing = 0;
798 eni_vcc->servicing = 0;
799 eni_vcc->next = ENI_VCC_NOS;
800 return 0;
801}
802
803
804static int open_rx_second(struct atm_vcc *vcc)
805{
806 void __iomem *here;
807 struct eni_dev *eni_dev;
808 struct eni_vcc *eni_vcc;
809 unsigned long size;
810 int order;
811
812 DPRINTK("open_rx_second\n");
813 eni_dev = ENI_DEV(vcc->dev);
814 eni_vcc = ENI_VCC(vcc);
815 if (!eni_vcc->rx) return 0;
816 /* set up VCI descriptor */
817 here = eni_dev->vci+vcc->vci*16;
818 DPRINTK("loc 0x%x\n",(unsigned) (eni_vcc->recv-eni_dev->ram)/4);
819 size = eni_vcc->words >> 8;
820 for (order = -1; size; order++) size >>= 1;
821 writel(0,here+4); /* descr, read = 0 */
822 writel(0,here+8); /* write, state, count = 0 */
823 if (eni_dev->rx_map[vcc->vci])
824 printk(KERN_CRIT DEV_LABEL "(itf %d): BUG - VCI %d already "
825 "in use\n",vcc->dev->number,vcc->vci);
826 eni_dev->rx_map[vcc->vci] = vcc; /* now it counts */
827 writel(((vcc->qos.aal != ATM_AAL5 ? MID_MODE_RAW : MID_MODE_AAL5) <<
828 MID_VCI_MODE_SHIFT) | MID_VCI_PTI_MODE |
829 (((eni_vcc->recv-eni_dev->ram) >> (MID_LOC_SKIP+2)) <<
830 MID_VCI_LOCATION_SHIFT) | (order << MID_VCI_SIZE_SHIFT),here);
831 return 0;
832}
833
834
835static void close_rx(struct atm_vcc *vcc)
836{
837 DECLARE_WAITQUEUE(wait,current);
838 void __iomem *here;
839 struct eni_dev *eni_dev;
840 struct eni_vcc *eni_vcc;
841
842 eni_vcc = ENI_VCC(vcc);
843 if (!eni_vcc->rx) return;
844 eni_dev = ENI_DEV(vcc->dev);
845 if (vcc->vpi != ATM_VPI_UNSPEC && vcc->vci != ATM_VCI_UNSPEC) {
846 here = eni_dev->vci+vcc->vci*16;
847 /* block receiver */
848 writel((readl(here) & ~MID_VCI_MODE) | (MID_MODE_TRASH <<
849 MID_VCI_MODE_SHIFT),here);
850 /* wait for receiver to become idle */
851 udelay(27);
852 /* discard pending cell */
853 writel(readl(here) & ~MID_VCI_IN_SERVICE,here);
854 /* don't accept any new ones */
855 eni_dev->rx_map[vcc->vci] = NULL;
856 /* wait for RX queue to drain */
857 DPRINTK("eni_close: waiting for RX ...\n");
858 EVENT("RX closing\n",0,0);
859 add_wait_queue(&eni_dev->rx_wait,&wait);
860 set_current_state(TASK_UNINTERRUPTIBLE);
861 barrier();
862 for (;;) {
863 /* transition service->rx: rxing++, servicing-- */
864 if (!eni_vcc->servicing) {
865 barrier();
866 if (!eni_vcc->rxing) break;
867 }
868 EVENT("drain PDUs (rx %ld, serv %ld)\n",eni_vcc->rxing,
869 eni_vcc->servicing);
870 printk(KERN_INFO "%d+%d RX left\n",eni_vcc->servicing,
871 eni_vcc->rxing);
872 schedule();
873 set_current_state(TASK_UNINTERRUPTIBLE);
874 }
875 for (;;) {
876 int at_end;
877 u32 tmp;
878
879 tasklet_disable(&eni_dev->task);
880 tmp = readl(eni_dev->vci+vcc->vci*16+4) & MID_VCI_READ;
881 at_end = eni_vcc->rx_pos == tmp >> MID_VCI_READ_SHIFT;
882 tasklet_enable(&eni_dev->task);
883 if (at_end) break;
884 EVENT("drain discard (host 0x%lx, nic 0x%lx)\n",
885 eni_vcc->rx_pos,tmp);
886 printk(KERN_INFO "draining RX: host 0x%lx, nic 0x%x\n",
887 eni_vcc->rx_pos,tmp);
888 schedule();
889 set_current_state(TASK_UNINTERRUPTIBLE);
890 }
891 set_current_state(TASK_RUNNING);
892 remove_wait_queue(&eni_dev->rx_wait,&wait);
893 }
894 eni_free_mem(eni_dev,eni_vcc->recv,eni_vcc->words << 2);
895 eni_vcc->rx = NULL;
896}
897
898
899static int start_rx(struct atm_dev *dev)
900{
901 struct eni_dev *eni_dev;
902
903 eni_dev = ENI_DEV(dev);
904 eni_dev->rx_map = (struct atm_vcc **) get_zeroed_page(GFP_KERNEL);
905 if (!eni_dev->rx_map) {
906 printk(KERN_ERR DEV_LABEL "(itf %d): couldn't get free page\n",
907 dev->number);
908 free_page((unsigned long) eni_dev->free_list);
909 return -ENOMEM;
910 }
911 eni_dev->rx_mult = DEFAULT_RX_MULT;
912 eni_dev->fast = eni_dev->last_fast = NULL;
913 eni_dev->slow = eni_dev->last_slow = NULL;
914 init_waitqueue_head(&eni_dev->rx_wait);
915 skb_queue_head_init(&eni_dev->rx_queue);
916 eni_dev->serv_read = eni_in(MID_SERV_WRITE);
917 eni_out(0,MID_DMA_WR_RX);
918 return 0;
919}
920
921
922/*----------------------------------- TX ------------------------------------*/
923
924
925enum enq_res { enq_ok,enq_next,enq_jam };
926
927
928static inline void put_dma(int chan,u32 *dma,int *j,dma_addr_t paddr,
929 u32 size)
930{
931 u32 init,words;
932
933 DPRINTK("put_dma: 0x%lx+0x%x\n",(unsigned long) paddr,size);
934 EVENT("put_dma: 0x%lx+0x%lx\n",(unsigned long) paddr,size);
935#if 0 /* don't complain anymore */
936 if (paddr & 3)
937 printk(KERN_ERR "put_dma: unaligned addr (0x%lx)\n",paddr);
938 if (size & 3)
939 printk(KERN_ERR "put_dma: unaligned size (0x%lx)\n",size);
940#endif
941 if (paddr & 3) {
942 init = 4-(paddr & 3);
943 if (init > size || size < 7) init = size;
944 DPRINTK("put_dma: %lx DMA: %d/%d bytes\n",
945 (unsigned long) paddr,init,size);
946 dma[(*j)++] = MID_DT_BYTE | (init << MID_DMA_COUNT_SHIFT) |
947 (chan << MID_DMA_CHAN_SHIFT);
948 dma[(*j)++] = paddr;
949 paddr += init;
950 size -= init;
951 }
952 words = size >> 2;
953 size &= 3;
954 if (words && (paddr & 31)) {
955 init = 8-((paddr & 31) >> 2);
956 if (init > words) init = words;
957 DPRINTK("put_dma: %lx DMA: %d/%d words\n",
958 (unsigned long) paddr,init,words);
959 dma[(*j)++] = MID_DT_WORD | (init << MID_DMA_COUNT_SHIFT) |
960 (chan << MID_DMA_CHAN_SHIFT);
961 dma[(*j)++] = paddr;
962 paddr += init << 2;
963 words -= init;
964 }
965#ifdef CONFIG_ATM_ENI_BURST_TX_16W /* may work with some PCI chipsets ... */
966 if (words & ~15) {
967 DPRINTK("put_dma: %lx DMA: %d*16/%d words\n",
968 (unsigned long) paddr,words >> 4,words);
969 dma[(*j)++] = MID_DT_16W | ((words >> 4) << MID_DMA_COUNT_SHIFT)
970 | (chan << MID_DMA_CHAN_SHIFT);
971 dma[(*j)++] = paddr;
972 paddr += (words & ~15) << 2;
973 words &= 15;
974 }
975#endif
976#ifdef CONFIG_ATM_ENI_BURST_TX_8W /* recommended */
977 if (words & ~7) {
978 DPRINTK("put_dma: %lx DMA: %d*8/%d words\n",
979 (unsigned long) paddr,words >> 3,words);
980 dma[(*j)++] = MID_DT_8W | ((words >> 3) << MID_DMA_COUNT_SHIFT)
981 | (chan << MID_DMA_CHAN_SHIFT);
982 dma[(*j)++] = paddr;
983 paddr += (words & ~7) << 2;
984 words &= 7;
985 }
986#endif
987#ifdef CONFIG_ATM_ENI_BURST_TX_4W /* probably useless if TX_8W or TX_16W */
988 if (words & ~3) {
989 DPRINTK("put_dma: %lx DMA: %d*4/%d words\n",
990 (unsigned long) paddr,words >> 2,words);
991 dma[(*j)++] = MID_DT_4W | ((words >> 2) << MID_DMA_COUNT_SHIFT)
992 | (chan << MID_DMA_CHAN_SHIFT);
993 dma[(*j)++] = paddr;
994 paddr += (words & ~3) << 2;
995 words &= 3;
996 }
997#endif
998#ifdef CONFIG_ATM_ENI_BURST_TX_2W /* probably useless if TX_4W, TX_8W, ... */
999 if (words & ~1) {
1000 DPRINTK("put_dma: %lx DMA: %d*2/%d words\n",
1001 (unsigned long) paddr,words >> 1,words);
1002 dma[(*j)++] = MID_DT_2W | ((words >> 1) << MID_DMA_COUNT_SHIFT)
1003 | (chan << MID_DMA_CHAN_SHIFT);
1004 dma[(*j)++] = paddr;
1005 paddr += (words & ~1) << 2;
1006 words &= 1;
1007 }
1008#endif
1009 if (words) {
1010 DPRINTK("put_dma: %lx DMA: %d words\n",(unsigned long) paddr,
1011 words);
1012 dma[(*j)++] = MID_DT_WORD | (words << MID_DMA_COUNT_SHIFT) |
1013 (chan << MID_DMA_CHAN_SHIFT);
1014 dma[(*j)++] = paddr;
1015 paddr += words << 2;
1016 }
1017 if (size) {
1018 DPRINTK("put_dma: %lx DMA: %d bytes\n",(unsigned long) paddr,
1019 size);
1020 dma[(*j)++] = MID_DT_BYTE | (size << MID_DMA_COUNT_SHIFT) |
1021 (chan << MID_DMA_CHAN_SHIFT);
1022 dma[(*j)++] = paddr;
1023 }
1024}
1025
1026
1027static enum enq_res do_tx(struct sk_buff *skb)
1028{
1029 struct atm_vcc *vcc;
1030 struct eni_dev *eni_dev;
1031 struct eni_vcc *eni_vcc;
1032 struct eni_tx *tx;
1033 dma_addr_t paddr;
1034 u32 dma_rd,dma_wr;
1035 u32 size; /* in words */
1036 int aal5,dma_size,i,j;
1037 unsigned char skb_data3;
1038
1039 DPRINTK(">do_tx\n");
1040 NULLCHECK(skb);
1041 EVENT("do_tx: skb=0x%lx, %ld bytes\n",(unsigned long) skb,skb->len);
1042 vcc = ATM_SKB(skb)->vcc;
1043 NULLCHECK(vcc);
1044 eni_dev = ENI_DEV(vcc->dev);
1045 NULLCHECK(eni_dev);
1046 eni_vcc = ENI_VCC(vcc);
1047 tx = eni_vcc->tx;
1048 NULLCHECK(tx);
1049#if 0 /* Enable this for testing with the "align" program */
1050 {
1051 unsigned int hack = *((char *) skb->data)-'0';
1052
1053 if (hack < 8) {
1054 skb->data += hack;
1055 skb->len -= hack;
1056 }
1057 }
1058#endif
1059#if 0 /* should work now */
1060 if ((unsigned long) skb->data & 3)
1061 printk(KERN_ERR DEV_LABEL "(itf %d): VCI %d has mis-aligned "
1062 "TX data\n",vcc->dev->number,vcc->vci);
1063#endif
1064 /*
1065 * Potential future IP speedup: make hard_header big enough to put
1066 * segmentation descriptor directly into PDU. Saves: 4 slave writes,
1067 * 1 DMA xfer & 2 DMA'ed bytes (protocol layering is for wimps :-)
1068 */
1069
1070 aal5 = vcc->qos.aal == ATM_AAL5;
1071 /* check space in buffer */
1072 if (!aal5)
1073 size = (ATM_CELL_PAYLOAD >> 2)+TX_DESCR_SIZE;
1074 /* cell without HEC plus segmentation header (includes
1075 four-byte cell header) */
1076 else {
1077 size = skb->len+4*AAL5_TRAILER+ATM_CELL_PAYLOAD-1;
1078 /* add AAL5 trailer */
1079 size = ((size-(size % ATM_CELL_PAYLOAD)) >> 2)+TX_DESCR_SIZE;
1080 /* add segmentation header */
1081 }
1082 /*
1083 * Can I move tx_pos by size bytes without getting closer than TX_GAP
1084 * to the read pointer ? TX_GAP means to leave some space for what
1085 * the manual calls "too close".
1086 */
1087 if (!NEPMOK(tx->tx_pos,size+TX_GAP,
1088 eni_in(MID_TX_RDPTR(tx->index)),tx->words)) {
1089 DPRINTK(DEV_LABEL "(itf %d): TX full (size %d)\n",
1090 vcc->dev->number,size);
1091 return enq_next;
1092 }
1093 /* check DMA */
1094 dma_wr = eni_in(MID_DMA_WR_TX);
1095 dma_rd = eni_in(MID_DMA_RD_TX);
1096 dma_size = 3; /* JK for descriptor and final fill, plus final size
1097 mis-alignment fix */
1098DPRINTK("iovcnt = %d\n",skb_shinfo(skb)->nr_frags);
1099 if (!skb_shinfo(skb)->nr_frags) dma_size += 5;
1100 else dma_size += 5*(skb_shinfo(skb)->nr_frags+1);
1101 if (dma_size > TX_DMA_BUF) {
1102 printk(KERN_CRIT DEV_LABEL "(itf %d): needs %d DMA entries "
1103 "(got only %d)\n",vcc->dev->number,dma_size,TX_DMA_BUF);
1104 }
1105 DPRINTK("dma_wr is %d, tx_pos is %ld\n",dma_wr,tx->tx_pos);
1106 if (dma_wr != dma_rd && ((dma_rd+NR_DMA_TX-dma_wr) & (NR_DMA_TX-1)) <
1107 dma_size) {
1108 printk(KERN_WARNING DEV_LABEL "(itf %d): TX DMA full\n",
1109 vcc->dev->number);
1110 return enq_jam;
1111 }
1112 skb_data3 = skb->data[3];
1113 paddr = dma_map_single(&eni_dev->pci_dev->dev,skb->data,skb->len,
1114 DMA_TO_DEVICE);
1115 ENI_PRV_PADDR(skb) = paddr;
1116 /* prepare DMA queue entries */
1117 j = 0;
1118 eni_dev->dma[j++] = (((tx->tx_pos+TX_DESCR_SIZE) & (tx->words-1)) <<
1119 MID_DMA_COUNT_SHIFT) | (tx->index << MID_DMA_CHAN_SHIFT) |
1120 MID_DT_JK;
1121 j++;
1122 if (!skb_shinfo(skb)->nr_frags)
1123 if (aal5) put_dma(tx->index,eni_dev->dma,&j,paddr,skb->len);
1124 else put_dma(tx->index,eni_dev->dma,&j,paddr+4,skb->len-4);
1125 else {
1126DPRINTK("doing direct send\n"); /* @@@ well, this doesn't work anyway */
1127 for (i = -1; i < skb_shinfo(skb)->nr_frags; i++)
1128 if (i == -1)
1129 put_dma(tx->index,eni_dev->dma,&j,(unsigned long)
1130 skb->data,
1131 skb_headlen(skb));
1132 else
1133 put_dma(tx->index,eni_dev->dma,&j,(unsigned long)
1134 skb_frag_page(&skb_shinfo(skb)->frags[i]) +
1135 skb_frag_off(&skb_shinfo(skb)->frags[i]),
1136 skb_frag_size(&skb_shinfo(skb)->frags[i]));
1137 }
1138 if (skb->len & 3) {
1139 put_dma(tx->index, eni_dev->dma, &j, eni_dev->zero.dma,
1140 4 - (skb->len & 3));
1141 }
1142 /* JK for AAL5 trailer - AAL0 doesn't need it, but who cares ... */
1143 eni_dev->dma[j++] = (((tx->tx_pos+size) & (tx->words-1)) <<
1144 MID_DMA_COUNT_SHIFT) | (tx->index << MID_DMA_CHAN_SHIFT) |
1145 MID_DMA_END | MID_DT_JK;
1146 j++;
1147 DPRINTK("DMA at end: %d\n",j);
1148 /* store frame */
1149 writel((MID_SEG_TX_ID << MID_SEG_ID_SHIFT) |
1150 (aal5 ? MID_SEG_AAL5 : 0) | (tx->prescaler << MID_SEG_PR_SHIFT) |
1151 (tx->resolution << MID_SEG_RATE_SHIFT) |
1152 (size/(ATM_CELL_PAYLOAD/4)),tx->send+tx->tx_pos*4);
1153/*printk("dsc = 0x%08lx\n",(unsigned long) readl(tx->send+tx->tx_pos*4));*/
1154 writel((vcc->vci << MID_SEG_VCI_SHIFT) |
1155 (aal5 ? 0 : (skb_data3 & 0xf)) |
1156 (ATM_SKB(skb)->atm_options & ATM_ATMOPT_CLP ? MID_SEG_CLP : 0),
1157 tx->send+((tx->tx_pos+1) & (tx->words-1))*4);
1158 DPRINTK("size: %d, len:%d\n",size,skb->len);
1159 if (aal5)
1160 writel(skb->len,tx->send+
1161 ((tx->tx_pos+size-AAL5_TRAILER) & (tx->words-1))*4);
1162 j = j >> 1;
1163 for (i = 0; i < j; i++) {
1164 writel(eni_dev->dma[i*2],eni_dev->tx_dma+dma_wr*8);
1165 writel(eni_dev->dma[i*2+1],eni_dev->tx_dma+dma_wr*8+4);
1166 dma_wr = (dma_wr+1) & (NR_DMA_TX-1);
1167 }
1168 ENI_PRV_POS(skb) = tx->tx_pos;
1169 ENI_PRV_SIZE(skb) = size;
1170 ENI_VCC(vcc)->txing += size;
1171 tx->tx_pos = (tx->tx_pos+size) & (tx->words-1);
1172 DPRINTK("dma_wr set to %d, tx_pos is now %ld\n",dma_wr,tx->tx_pos);
1173 eni_out(dma_wr,MID_DMA_WR_TX);
1174 skb_queue_tail(&eni_dev->tx_queue,skb);
1175 queued++;
1176 return enq_ok;
1177}
1178
1179
1180static void poll_tx(struct atm_dev *dev)
1181{
1182 struct eni_tx *tx;
1183 struct sk_buff *skb;
1184 enum enq_res res;
1185 int i;
1186
1187 DPRINTK(">poll_tx\n");
1188 for (i = NR_CHAN-1; i >= 0; i--) {
1189 tx = &ENI_DEV(dev)->tx[i];
1190 if (tx->send)
1191 while ((skb = skb_dequeue(&tx->backlog))) {
1192 res = do_tx(skb);
1193 if (res == enq_ok) continue;
1194 DPRINTK("re-queuing TX PDU\n");
1195 skb_queue_head(&tx->backlog,skb);
1196 requeued++;
1197 if (res == enq_jam) return;
1198 break;
1199 }
1200 }
1201}
1202
1203
1204static void dequeue_tx(struct atm_dev *dev)
1205{
1206 struct eni_dev *eni_dev;
1207 struct atm_vcc *vcc;
1208 struct sk_buff *skb;
1209 struct eni_tx *tx;
1210
1211 NULLCHECK(dev);
1212 eni_dev = ENI_DEV(dev);
1213 NULLCHECK(eni_dev);
1214 while ((skb = skb_dequeue(&eni_dev->tx_queue))) {
1215 vcc = ATM_SKB(skb)->vcc;
1216 NULLCHECK(vcc);
1217 tx = ENI_VCC(vcc)->tx;
1218 NULLCHECK(ENI_VCC(vcc)->tx);
1219 DPRINTK("dequeue_tx: next 0x%lx curr 0x%x\n",ENI_PRV_POS(skb),
1220 (unsigned) eni_in(MID_TX_DESCRSTART(tx->index)));
1221 if (ENI_VCC(vcc)->txing < tx->words && ENI_PRV_POS(skb) ==
1222 eni_in(MID_TX_DESCRSTART(tx->index))) {
1223 skb_queue_head(&eni_dev->tx_queue,skb);
1224 break;
1225 }
1226 ENI_VCC(vcc)->txing -= ENI_PRV_SIZE(skb);
1227 dma_unmap_single(&eni_dev->pci_dev->dev,ENI_PRV_PADDR(skb),skb->len,
1228 DMA_TO_DEVICE);
1229 if (vcc->pop) vcc->pop(vcc,skb);
1230 else dev_kfree_skb_irq(skb);
1231 atomic_inc(&vcc->stats->tx);
1232 wake_up(&eni_dev->tx_wait);
1233 dma_complete++;
1234 }
1235}
1236
1237
1238static struct eni_tx *alloc_tx(struct eni_dev *eni_dev,int ubr)
1239{
1240 int i;
1241
1242 for (i = !ubr; i < NR_CHAN; i++)
1243 if (!eni_dev->tx[i].send) return eni_dev->tx+i;
1244 return NULL;
1245}
1246
1247
1248static int comp_tx(struct eni_dev *eni_dev,int *pcr,int reserved,int *pre,
1249 int *res,int unlimited)
1250{
1251 static const int pre_div[] = { 4,16,128,2048 };
1252 /* 2^(((x+2)^2-(x+2))/2+1) */
1253
1254 if (unlimited) *pre = *res = 0;
1255 else {
1256 if (*pcr > 0) {
1257 int div;
1258
1259 for (*pre = 0; *pre < 3; (*pre)++)
1260 if (TS_CLOCK/pre_div[*pre]/64 <= *pcr) break;
1261 div = pre_div[*pre]**pcr;
1262 DPRINTK("min div %d\n",div);
1263 *res = TS_CLOCK/div-1;
1264 }
1265 else {
1266 int div;
1267
1268 if (!*pcr) *pcr = eni_dev->tx_bw+reserved;
1269 for (*pre = 3; *pre >= 0; (*pre)--)
1270 if (TS_CLOCK/pre_div[*pre]/64 > -*pcr) break;
1271 if (*pre < 3) (*pre)++; /* else fail later */
1272 div = pre_div[*pre]*-*pcr;
1273 DPRINTK("max div %d\n",div);
1274 *res = DIV_ROUND_UP(TS_CLOCK, div)-1;
1275 }
1276 if (*res < 0) *res = 0;
1277 if (*res > MID_SEG_MAX_RATE) *res = MID_SEG_MAX_RATE;
1278 }
1279 *pcr = TS_CLOCK/pre_div[*pre]/(*res+1);
1280 DPRINTK("out pcr: %d (%d:%d)\n",*pcr,*pre,*res);
1281 return 0;
1282}
1283
1284
1285static int reserve_or_set_tx(struct atm_vcc *vcc,struct atm_trafprm *txtp,
1286 int set_rsv,int set_shp)
1287{
1288 struct eni_dev *eni_dev = ENI_DEV(vcc->dev);
1289 struct eni_vcc *eni_vcc = ENI_VCC(vcc);
1290 struct eni_tx *tx;
1291 unsigned long size;
1292 void __iomem *mem;
1293 int rate,ubr,unlimited,new_tx;
1294 int pre,res,order;
1295 int error;
1296
1297 rate = atm_pcr_goal(txtp);
1298 ubr = txtp->traffic_class == ATM_UBR;
1299 unlimited = ubr && (!rate || rate <= -ATM_OC3_PCR ||
1300 rate >= ATM_OC3_PCR);
1301 if (!unlimited) {
1302 size = txtp->max_sdu*eni_dev->tx_mult/100;
1303 if (size > MID_MAX_BUF_SIZE && txtp->max_sdu <=
1304 MID_MAX_BUF_SIZE)
1305 size = MID_MAX_BUF_SIZE;
1306 }
1307 else {
1308 if (eni_dev->ubr) {
1309 eni_vcc->tx = eni_dev->ubr;
1310 txtp->pcr = ATM_OC3_PCR;
1311 return 0;
1312 }
1313 size = UBR_BUFFER;
1314 }
1315 new_tx = !eni_vcc->tx;
1316 mem = NULL; /* for gcc */
1317 if (!new_tx) tx = eni_vcc->tx;
1318 else {
1319 mem = eni_alloc_mem(eni_dev,&size);
1320 if (!mem) return -ENOBUFS;
1321 tx = alloc_tx(eni_dev,unlimited);
1322 if (!tx) {
1323 eni_free_mem(eni_dev,mem,size);
1324 return -EBUSY;
1325 }
1326 DPRINTK("got chan %d\n",tx->index);
1327 tx->reserved = tx->shaping = 0;
1328 tx->send = mem;
1329 tx->words = size >> 2;
1330 skb_queue_head_init(&tx->backlog);
1331 for (order = 0; size > (1 << (order+10)); order++);
1332 eni_out((order << MID_SIZE_SHIFT) |
1333 ((tx->send-eni_dev->ram) >> (MID_LOC_SKIP+2)),
1334 MID_TX_PLACE(tx->index));
1335 tx->tx_pos = eni_in(MID_TX_DESCRSTART(tx->index)) &
1336 MID_DESCR_START;
1337 }
1338 error = comp_tx(eni_dev,&rate,tx->reserved,&pre,&res,unlimited);
1339 if (!error && txtp->min_pcr > rate) error = -EINVAL;
1340 if (!error && txtp->max_pcr && txtp->max_pcr != ATM_MAX_PCR &&
1341 txtp->max_pcr < rate) error = -EINVAL;
1342 if (!error && !ubr && rate > eni_dev->tx_bw+tx->reserved)
1343 error = -EINVAL;
1344 if (!error && set_rsv && !set_shp && rate < tx->shaping)
1345 error = -EINVAL;
1346 if (!error && !set_rsv && rate > tx->reserved && !ubr)
1347 error = -EINVAL;
1348 if (error) {
1349 if (new_tx) {
1350 tx->send = NULL;
1351 eni_free_mem(eni_dev,mem,size);
1352 }
1353 return error;
1354 }
1355 txtp->pcr = rate;
1356 if (set_rsv && !ubr) {
1357 eni_dev->tx_bw += tx->reserved;
1358 tx->reserved = rate;
1359 eni_dev->tx_bw -= rate;
1360 }
1361 if (set_shp || (unlimited && new_tx)) {
1362 if (unlimited && new_tx) eni_dev->ubr = tx;
1363 tx->prescaler = pre;
1364 tx->resolution = res;
1365 tx->shaping = rate;
1366 }
1367 if (set_shp) eni_vcc->tx = tx;
1368 DPRINTK("rsv %d shp %d\n",tx->reserved,tx->shaping);
1369 return 0;
1370}
1371
1372
1373static int open_tx_first(struct atm_vcc *vcc)
1374{
1375 ENI_VCC(vcc)->tx = NULL;
1376 if (vcc->qos.txtp.traffic_class == ATM_NONE) return 0;
1377 ENI_VCC(vcc)->txing = 0;
1378 return reserve_or_set_tx(vcc,&vcc->qos.txtp,1,1);
1379}
1380
1381
1382static int open_tx_second(struct atm_vcc *vcc)
1383{
1384 return 0; /* nothing to do */
1385}
1386
1387
1388static void close_tx(struct atm_vcc *vcc)
1389{
1390 DECLARE_WAITQUEUE(wait,current);
1391 struct eni_dev *eni_dev;
1392 struct eni_vcc *eni_vcc;
1393
1394 eni_vcc = ENI_VCC(vcc);
1395 if (!eni_vcc->tx) return;
1396 eni_dev = ENI_DEV(vcc->dev);
1397 /* wait for TX queue to drain */
1398 DPRINTK("eni_close: waiting for TX ...\n");
1399 add_wait_queue(&eni_dev->tx_wait,&wait);
1400 set_current_state(TASK_UNINTERRUPTIBLE);
1401 for (;;) {
1402 int txing;
1403
1404 tasklet_disable(&eni_dev->task);
1405 txing = skb_peek(&eni_vcc->tx->backlog) || eni_vcc->txing;
1406 tasklet_enable(&eni_dev->task);
1407 if (!txing) break;
1408 DPRINTK("%d TX left\n",eni_vcc->txing);
1409 schedule();
1410 set_current_state(TASK_UNINTERRUPTIBLE);
1411 }
1412 set_current_state(TASK_RUNNING);
1413 remove_wait_queue(&eni_dev->tx_wait,&wait);
1414 if (eni_vcc->tx != eni_dev->ubr) {
1415 /*
1416 * Looping a few times in here is probably far cheaper than
1417 * keeping track of TX completions all the time, so let's poll
1418 * a bit ...
1419 */
1420 while (eni_in(MID_TX_RDPTR(eni_vcc->tx->index)) !=
1421 eni_in(MID_TX_DESCRSTART(eni_vcc->tx->index)))
1422 schedule();
1423 eni_free_mem(eni_dev,eni_vcc->tx->send,eni_vcc->tx->words << 2);
1424 eni_vcc->tx->send = NULL;
1425 eni_dev->tx_bw += eni_vcc->tx->reserved;
1426 }
1427 eni_vcc->tx = NULL;
1428}
1429
1430
1431static int start_tx(struct atm_dev *dev)
1432{
1433 struct eni_dev *eni_dev;
1434 int i;
1435
1436 eni_dev = ENI_DEV(dev);
1437 eni_dev->lost = 0;
1438 eni_dev->tx_bw = ATM_OC3_PCR;
1439 eni_dev->tx_mult = DEFAULT_TX_MULT;
1440 init_waitqueue_head(&eni_dev->tx_wait);
1441 eni_dev->ubr = NULL;
1442 skb_queue_head_init(&eni_dev->tx_queue);
1443 eni_out(0,MID_DMA_WR_TX);
1444 for (i = 0; i < NR_CHAN; i++) {
1445 eni_dev->tx[i].send = NULL;
1446 eni_dev->tx[i].index = i;
1447 }
1448 return 0;
1449}
1450
1451
1452/*--------------------------------- common ----------------------------------*/
1453
1454
1455#if 0 /* may become useful again when tuning things */
1456
1457static void foo(void)
1458{
1459printk(KERN_INFO
1460 "tx_complete=%d,dma_complete=%d,queued=%d,requeued=%d,sub=%d,\n"
1461 "backlogged=%d,rx_enqueued=%d,rx_dequeued=%d,putting=%d,pushed=%d\n",
1462 tx_complete,dma_complete,queued,requeued,submitted,backlogged,
1463 rx_enqueued,rx_dequeued,putting,pushed);
1464if (eni_boards) printk(KERN_INFO "loss: %ld\n",ENI_DEV(eni_boards)->lost);
1465}
1466
1467#endif
1468
1469
1470static void bug_int(struct atm_dev *dev,unsigned long reason)
1471{
1472 DPRINTK(">bug_int\n");
1473 if (reason & MID_DMA_ERR_ACK)
1474 printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - DMA "
1475 "error\n",dev->number);
1476 if (reason & MID_TX_IDENT_MISM)
1477 printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - ident "
1478 "mismatch\n",dev->number);
1479 if (reason & MID_TX_DMA_OVFL)
1480 printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - DMA "
1481 "overflow\n",dev->number);
1482 EVENT("---dump ends here---\n",0,0);
1483 printk(KERN_NOTICE "---recent events---\n");
1484 event_dump();
1485}
1486
1487
1488static irqreturn_t eni_int(int irq,void *dev_id)
1489{
1490 struct atm_dev *dev;
1491 struct eni_dev *eni_dev;
1492 u32 reason;
1493
1494 DPRINTK(">eni_int\n");
1495 dev = dev_id;
1496 eni_dev = ENI_DEV(dev);
1497 reason = eni_in(MID_ISA);
1498 DPRINTK(DEV_LABEL ": int 0x%lx\n",(unsigned long) reason);
1499 /*
1500 * Must handle these two right now, because reading ISA doesn't clear
1501 * them, so they re-occur and we never make it to the tasklet. Since
1502 * they're rare, we don't mind the occasional invocation of eni_tasklet
1503 * with eni_dev->events == 0.
1504 */
1505 if (reason & MID_STAT_OVFL) {
1506 EVENT("stat overflow\n",0,0);
1507 eni_dev->lost += eni_in(MID_STAT) & MID_OVFL_TRASH;
1508 }
1509 if (reason & MID_SUNI_INT) {
1510 EVENT("SUNI int\n",0,0);
1511 dev->phy->interrupt(dev);
1512#if 0
1513 foo();
1514#endif
1515 }
1516 spin_lock(&eni_dev->lock);
1517 eni_dev->events |= reason;
1518 spin_unlock(&eni_dev->lock);
1519 tasklet_schedule(&eni_dev->task);
1520 return IRQ_HANDLED;
1521}
1522
1523
1524static void eni_tasklet(unsigned long data)
1525{
1526 struct atm_dev *dev = (struct atm_dev *) data;
1527 struct eni_dev *eni_dev = ENI_DEV(dev);
1528 unsigned long flags;
1529 u32 events;
1530
1531 DPRINTK("eni_tasklet (dev %p)\n",dev);
1532 spin_lock_irqsave(&eni_dev->lock,flags);
1533 events = xchg(&eni_dev->events,0);
1534 spin_unlock_irqrestore(&eni_dev->lock,flags);
1535 if (events & MID_RX_DMA_COMPLETE) {
1536 EVENT("INT: RX DMA complete, starting dequeue_rx\n",0,0);
1537 dequeue_rx(dev);
1538 EVENT("dequeue_rx done, starting poll_rx\n",0,0);
1539 poll_rx(dev);
1540 EVENT("poll_rx done\n",0,0);
1541 /* poll_tx ? */
1542 }
1543 if (events & MID_SERVICE) {
1544 EVENT("INT: service, starting get_service\n",0,0);
1545 get_service(dev);
1546 EVENT("get_service done, starting poll_rx\n",0,0);
1547 poll_rx(dev);
1548 EVENT("poll_rx done\n",0,0);
1549 }
1550 if (events & MID_TX_DMA_COMPLETE) {
1551 EVENT("INT: TX DMA COMPLETE\n",0,0);
1552 dequeue_tx(dev);
1553 }
1554 if (events & MID_TX_COMPLETE) {
1555 EVENT("INT: TX COMPLETE\n",0,0);
1556 tx_complete++;
1557 wake_up(&eni_dev->tx_wait);
1558 /* poll_rx ? */
1559 }
1560 if (events & (MID_DMA_ERR_ACK | MID_TX_IDENT_MISM | MID_TX_DMA_OVFL)) {
1561 EVENT("bug interrupt\n",0,0);
1562 bug_int(dev,events);
1563 }
1564 poll_tx(dev);
1565}
1566
1567
1568/*--------------------------------- entries ---------------------------------*/
1569
1570
1571static char * const media_name[] = {
1572 "MMF", "SMF", "MMF", "03?", /* 0- 3 */
1573 "UTP", "05?", "06?", "07?", /* 4- 7 */
1574 "TAXI","09?", "10?", "11?", /* 8-11 */
1575 "12?", "13?", "14?", "15?", /* 12-15 */
1576 "MMF", "SMF", "18?", "19?", /* 16-19 */
1577 "UTP", "21?", "22?", "23?", /* 20-23 */
1578 "24?", "25?", "26?", "27?", /* 24-27 */
1579 "28?", "29?", "30?", "31?" /* 28-31 */
1580};
1581
1582
1583#define SET_SEPROM \
1584 ({ if (!error && !pci_error) { \
1585 pci_error = pci_write_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,tonga); \
1586 udelay(10); /* 10 usecs */ \
1587 } })
1588#define GET_SEPROM \
1589 ({ if (!error && !pci_error) { \
1590 pci_error = pci_read_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,&tonga); \
1591 udelay(10); /* 10 usecs */ \
1592 } })
1593
1594
1595static int get_esi_asic(struct atm_dev *dev)
1596{
1597 struct eni_dev *eni_dev;
1598 unsigned char tonga;
1599 int error,failed,pci_error;
1600 int address,i,j;
1601
1602 eni_dev = ENI_DEV(dev);
1603 error = pci_error = 0;
1604 tonga = SEPROM_MAGIC | SEPROM_DATA | SEPROM_CLK;
1605 SET_SEPROM;
1606 for (i = 0; i < ESI_LEN && !error && !pci_error; i++) {
1607 /* start operation */
1608 tonga |= SEPROM_DATA;
1609 SET_SEPROM;
1610 tonga |= SEPROM_CLK;
1611 SET_SEPROM;
1612 tonga &= ~SEPROM_DATA;
1613 SET_SEPROM;
1614 tonga &= ~SEPROM_CLK;
1615 SET_SEPROM;
1616 /* send address */
1617 address = ((i+SEPROM_ESI_BASE) << 1)+1;
1618 for (j = 7; j >= 0; j--) {
1619 tonga = (address >> j) & 1 ? tonga | SEPROM_DATA :
1620 tonga & ~SEPROM_DATA;
1621 SET_SEPROM;
1622 tonga |= SEPROM_CLK;
1623 SET_SEPROM;
1624 tonga &= ~SEPROM_CLK;
1625 SET_SEPROM;
1626 }
1627 /* get ack */
1628 tonga |= SEPROM_DATA;
1629 SET_SEPROM;
1630 tonga |= SEPROM_CLK;
1631 SET_SEPROM;
1632 GET_SEPROM;
1633 failed = tonga & SEPROM_DATA;
1634 tonga &= ~SEPROM_CLK;
1635 SET_SEPROM;
1636 tonga |= SEPROM_DATA;
1637 SET_SEPROM;
1638 if (failed) error = -EIO;
1639 else {
1640 dev->esi[i] = 0;
1641 for (j = 7; j >= 0; j--) {
1642 dev->esi[i] <<= 1;
1643 tonga |= SEPROM_DATA;
1644 SET_SEPROM;
1645 tonga |= SEPROM_CLK;
1646 SET_SEPROM;
1647 GET_SEPROM;
1648 if (tonga & SEPROM_DATA) dev->esi[i] |= 1;
1649 tonga &= ~SEPROM_CLK;
1650 SET_SEPROM;
1651 tonga |= SEPROM_DATA;
1652 SET_SEPROM;
1653 }
1654 /* get ack */
1655 tonga |= SEPROM_DATA;
1656 SET_SEPROM;
1657 tonga |= SEPROM_CLK;
1658 SET_SEPROM;
1659 GET_SEPROM;
1660 if (!(tonga & SEPROM_DATA)) error = -EIO;
1661 tonga &= ~SEPROM_CLK;
1662 SET_SEPROM;
1663 tonga |= SEPROM_DATA;
1664 SET_SEPROM;
1665 }
1666 /* stop operation */
1667 tonga &= ~SEPROM_DATA;
1668 SET_SEPROM;
1669 tonga |= SEPROM_CLK;
1670 SET_SEPROM;
1671 tonga |= SEPROM_DATA;
1672 SET_SEPROM;
1673 }
1674 if (pci_error) {
1675 printk(KERN_ERR DEV_LABEL "(itf %d): error reading ESI "
1676 "(0x%02x)\n",dev->number,pci_error);
1677 error = -EIO;
1678 }
1679 return error;
1680}
1681
1682
1683#undef SET_SEPROM
1684#undef GET_SEPROM
1685
1686
1687static int get_esi_fpga(struct atm_dev *dev, void __iomem *base)
1688{
1689 void __iomem *mac_base;
1690 int i;
1691
1692 mac_base = base+EPROM_SIZE-sizeof(struct midway_eprom);
1693 for (i = 0; i < ESI_LEN; i++) dev->esi[i] = readb(mac_base+(i^3));
1694 return 0;
1695}
1696
1697
1698static int eni_do_init(struct atm_dev *dev)
1699{
1700 struct midway_eprom __iomem *eprom;
1701 struct eni_dev *eni_dev;
1702 struct pci_dev *pci_dev;
1703 unsigned long real_base;
1704 void __iomem *base;
1705 int error,i,last;
1706
1707 DPRINTK(">eni_init\n");
1708 dev->ci_range.vpi_bits = 0;
1709 dev->ci_range.vci_bits = NR_VCI_LD;
1710 dev->link_rate = ATM_OC3_PCR;
1711 eni_dev = ENI_DEV(dev);
1712 pci_dev = eni_dev->pci_dev;
1713 real_base = pci_resource_start(pci_dev, 0);
1714 eni_dev->irq = pci_dev->irq;
1715 if ((error = pci_write_config_word(pci_dev,PCI_COMMAND,
1716 PCI_COMMAND_MEMORY |
1717 (eni_dev->asic ? PCI_COMMAND_PARITY | PCI_COMMAND_SERR : 0)))) {
1718 printk(KERN_ERR DEV_LABEL "(itf %d): can't enable memory "
1719 "(0x%02x)\n",dev->number,error);
1720 return -EIO;
1721 }
1722 printk(KERN_NOTICE DEV_LABEL "(itf %d): rev.%d,base=0x%lx,irq=%d,",
1723 dev->number,pci_dev->revision,real_base,eni_dev->irq);
1724 if (!(base = ioremap(real_base,MAP_MAX_SIZE))) {
1725 printk("\n");
1726 printk(KERN_ERR DEV_LABEL "(itf %d): can't set up page "
1727 "mapping\n",dev->number);
1728 return -ENOMEM;
1729 }
1730 eni_dev->ioaddr = base;
1731 eni_dev->base_diff = real_base - (unsigned long) base;
1732 /* id may not be present in ASIC Tonga boards - check this @@@ */
1733 if (!eni_dev->asic) {
1734 eprom = (base+EPROM_SIZE-sizeof(struct midway_eprom));
1735 if (readl(&eprom->magic) != ENI155_MAGIC) {
1736 printk("\n");
1737 printk(KERN_ERR DEV_LABEL
1738 "(itf %d): bad magic - expected 0x%x, got 0x%x\n",
1739 dev->number, ENI155_MAGIC,
1740 (unsigned)readl(&eprom->magic));
1741 error = -EINVAL;
1742 goto unmap;
1743 }
1744 }
1745 eni_dev->phy = base+PHY_BASE;
1746 eni_dev->reg = base+REG_BASE;
1747 eni_dev->ram = base+RAM_BASE;
1748 last = MAP_MAX_SIZE-RAM_BASE;
1749 for (i = last-RAM_INCREMENT; i >= 0; i -= RAM_INCREMENT) {
1750 writel(0x55555555,eni_dev->ram+i);
1751 if (readl(eni_dev->ram+i) != 0x55555555) last = i;
1752 else {
1753 writel(0xAAAAAAAA,eni_dev->ram+i);
1754 if (readl(eni_dev->ram+i) != 0xAAAAAAAA) last = i;
1755 else writel(i,eni_dev->ram+i);
1756 }
1757 }
1758 for (i = 0; i < last; i += RAM_INCREMENT)
1759 if (readl(eni_dev->ram+i) != i) break;
1760 eni_dev->mem = i;
1761 memset_io(eni_dev->ram,0,eni_dev->mem);
1762 /* TODO: should shrink allocation now */
1763 printk("mem=%dkB (",eni_dev->mem >> 10);
1764 /* TODO: check for non-SUNI, check for TAXI ? */
1765 if (!(eni_in(MID_RES_ID_MCON) & 0x200) != !eni_dev->asic) {
1766 printk(")\n");
1767 printk(KERN_ERR DEV_LABEL "(itf %d): ERROR - wrong id 0x%x\n",
1768 dev->number,(unsigned) eni_in(MID_RES_ID_MCON));
1769 error = -EINVAL;
1770 goto unmap;
1771 }
1772 error = eni_dev->asic ? get_esi_asic(dev) : get_esi_fpga(dev,base);
1773 if (error)
1774 goto unmap;
1775 for (i = 0; i < ESI_LEN; i++)
1776 printk("%s%02X",i ? "-" : "",dev->esi[i]);
1777 printk(")\n");
1778 printk(KERN_NOTICE DEV_LABEL "(itf %d): %s,%s\n",dev->number,
1779 eni_in(MID_RES_ID_MCON) & 0x200 ? "ASIC" : "FPGA",
1780 media_name[eni_in(MID_RES_ID_MCON) & DAUGHTER_ID]);
1781
1782 error = suni_init(dev);
1783 if (error)
1784 goto unmap;
1785out:
1786 return error;
1787unmap:
1788 iounmap(base);
1789 goto out;
1790}
1791
1792static void eni_do_release(struct atm_dev *dev)
1793{
1794 struct eni_dev *ed = ENI_DEV(dev);
1795
1796 dev->phy->stop(dev);
1797 dev->phy = NULL;
1798 iounmap(ed->ioaddr);
1799}
1800
1801static int eni_start(struct atm_dev *dev)
1802{
1803 struct eni_dev *eni_dev;
1804
1805 void __iomem *buf;
1806 unsigned long buffer_mem;
1807 int error;
1808
1809 DPRINTK(">eni_start\n");
1810 eni_dev = ENI_DEV(dev);
1811 if (request_irq(eni_dev->irq,&eni_int,IRQF_SHARED,DEV_LABEL,dev)) {
1812 printk(KERN_ERR DEV_LABEL "(itf %d): IRQ%d is already in use\n",
1813 dev->number,eni_dev->irq);
1814 error = -EAGAIN;
1815 goto out;
1816 }
1817 pci_set_master(eni_dev->pci_dev);
1818 if ((error = pci_write_config_word(eni_dev->pci_dev,PCI_COMMAND,
1819 PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
1820 (eni_dev->asic ? PCI_COMMAND_PARITY | PCI_COMMAND_SERR : 0)))) {
1821 printk(KERN_ERR DEV_LABEL "(itf %d): can't enable memory+"
1822 "master (0x%02x)\n",dev->number,error);
1823 goto free_irq;
1824 }
1825 if ((error = pci_write_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,
1826 END_SWAP_DMA))) {
1827 printk(KERN_ERR DEV_LABEL "(itf %d): can't set endian swap "
1828 "(0x%02x)\n",dev->number,error);
1829 goto free_irq;
1830 }
1831 /* determine addresses of internal tables */
1832 eni_dev->vci = eni_dev->ram;
1833 eni_dev->rx_dma = eni_dev->ram+NR_VCI*16;
1834 eni_dev->tx_dma = eni_dev->rx_dma+NR_DMA_RX*8;
1835 eni_dev->service = eni_dev->tx_dma+NR_DMA_TX*8;
1836 buf = eni_dev->service+NR_SERVICE*4;
1837 DPRINTK("vci 0x%lx,rx 0x%lx, tx 0x%lx,srv 0x%lx,buf 0x%lx\n",
1838 eni_dev->vci,eni_dev->rx_dma,eni_dev->tx_dma,
1839 eni_dev->service,buf);
1840 spin_lock_init(&eni_dev->lock);
1841 tasklet_init(&eni_dev->task,eni_tasklet,(unsigned long) dev);
1842 eni_dev->events = 0;
1843 /* initialize memory management */
1844 buffer_mem = eni_dev->mem - (buf - eni_dev->ram);
1845 eni_dev->free_list_size = buffer_mem/MID_MIN_BUF_SIZE/2;
1846 eni_dev->free_list = kmalloc_array(eni_dev->free_list_size + 1,
1847 sizeof(*eni_dev->free_list),
1848 GFP_KERNEL);
1849 if (!eni_dev->free_list) {
1850 printk(KERN_ERR DEV_LABEL "(itf %d): couldn't get free page\n",
1851 dev->number);
1852 error = -ENOMEM;
1853 goto free_irq;
1854 }
1855 eni_dev->free_len = 0;
1856 eni_put_free(eni_dev,buf,buffer_mem);
1857 memset_io(eni_dev->vci,0,16*NR_VCI); /* clear VCI table */
1858 /*
1859 * byte_addr free (k)
1860 * 0x00000000 512 VCI table
1861 * 0x00004000 496 RX DMA
1862 * 0x00005000 492 TX DMA
1863 * 0x00006000 488 service list
1864 * 0x00007000 484 buffers
1865 * 0x00080000 0 end (512kB)
1866 */
1867 eni_out(0xffffffff,MID_IE);
1868 error = start_tx(dev);
1869 if (error) goto free_list;
1870 error = start_rx(dev);
1871 if (error) goto free_list;
1872 error = dev->phy->start(dev);
1873 if (error) goto free_list;
1874 eni_out(eni_in(MID_MC_S) | (1 << MID_INT_SEL_SHIFT) |
1875 MID_TX_LOCK_MODE | MID_DMA_ENABLE | MID_TX_ENABLE | MID_RX_ENABLE,
1876 MID_MC_S);
1877 /* Tonga uses SBus INTReq1 */
1878 (void) eni_in(MID_ISA); /* clear Midway interrupts */
1879 return 0;
1880
1881free_list:
1882 kfree(eni_dev->free_list);
1883
1884free_irq:
1885 free_irq(eni_dev->irq, dev);
1886
1887out:
1888 return error;
1889}
1890
1891
1892static void eni_close(struct atm_vcc *vcc)
1893{
1894 DPRINTK(">eni_close\n");
1895 if (!ENI_VCC(vcc)) return;
1896 clear_bit(ATM_VF_READY,&vcc->flags);
1897 close_rx(vcc);
1898 close_tx(vcc);
1899 DPRINTK("eni_close: done waiting\n");
1900 /* deallocate memory */
1901 kfree(ENI_VCC(vcc));
1902 vcc->dev_data = NULL;
1903 clear_bit(ATM_VF_ADDR,&vcc->flags);
1904 /*foo();*/
1905}
1906
1907
1908static int eni_open(struct atm_vcc *vcc)
1909{
1910 struct eni_vcc *eni_vcc;
1911 int error;
1912 short vpi = vcc->vpi;
1913 int vci = vcc->vci;
1914
1915 DPRINTK(">eni_open\n");
1916 EVENT("eni_open\n",0,0);
1917 if (!test_bit(ATM_VF_PARTIAL,&vcc->flags))
1918 vcc->dev_data = NULL;
1919 if (vci != ATM_VPI_UNSPEC && vpi != ATM_VCI_UNSPEC)
1920 set_bit(ATM_VF_ADDR,&vcc->flags);
1921 if (vcc->qos.aal != ATM_AAL0 && vcc->qos.aal != ATM_AAL5)
1922 return -EINVAL;
1923 DPRINTK(DEV_LABEL "(itf %d): open %d.%d\n",vcc->dev->number,vcc->vpi,
1924 vcc->vci);
1925 if (!test_bit(ATM_VF_PARTIAL,&vcc->flags)) {
1926 eni_vcc = kmalloc(sizeof(struct eni_vcc),GFP_KERNEL);
1927 if (!eni_vcc) return -ENOMEM;
1928 vcc->dev_data = eni_vcc;
1929 eni_vcc->tx = NULL; /* for eni_close after open_rx */
1930 if ((error = open_rx_first(vcc))) {
1931 eni_close(vcc);
1932 return error;
1933 }
1934 if ((error = open_tx_first(vcc))) {
1935 eni_close(vcc);
1936 return error;
1937 }
1938 }
1939 if (vci == ATM_VPI_UNSPEC || vpi == ATM_VCI_UNSPEC) return 0;
1940 if ((error = open_rx_second(vcc))) {
1941 eni_close(vcc);
1942 return error;
1943 }
1944 if ((error = open_tx_second(vcc))) {
1945 eni_close(vcc);
1946 return error;
1947 }
1948 set_bit(ATM_VF_READY,&vcc->flags);
1949 /* should power down SUNI while !ref_count @@@ */
1950 return 0;
1951}
1952
1953
1954static int eni_change_qos(struct atm_vcc *vcc,struct atm_qos *qos,int flgs)
1955{
1956 struct eni_dev *eni_dev = ENI_DEV(vcc->dev);
1957 struct eni_tx *tx = ENI_VCC(vcc)->tx;
1958 struct sk_buff *skb;
1959 int error,rate,rsv,shp;
1960
1961 if (qos->txtp.traffic_class == ATM_NONE) return 0;
1962 if (tx == eni_dev->ubr) return -EBADFD;
1963 rate = atm_pcr_goal(&qos->txtp);
1964 if (rate < 0) rate = -rate;
1965 rsv = shp = 0;
1966 if ((flgs & ATM_MF_DEC_RSV) && rate && rate < tx->reserved) rsv = 1;
1967 if ((flgs & ATM_MF_INC_RSV) && (!rate || rate > tx->reserved)) rsv = 1;
1968 if ((flgs & ATM_MF_DEC_SHP) && rate && rate < tx->shaping) shp = 1;
1969 if ((flgs & ATM_MF_INC_SHP) && (!rate || rate > tx->shaping)) shp = 1;
1970 if (!rsv && !shp) return 0;
1971 error = reserve_or_set_tx(vcc,&qos->txtp,rsv,shp);
1972 if (error) return error;
1973 if (shp && !(flgs & ATM_MF_IMMED)) return 0;
1974 /*
1975 * Walk through the send buffer and patch the rate information in all
1976 * segmentation buffer descriptors of this VCC.
1977 */
1978 tasklet_disable(&eni_dev->task);
1979 skb_queue_walk(&eni_dev->tx_queue, skb) {
1980 void __iomem *dsc;
1981
1982 if (ATM_SKB(skb)->vcc != vcc) continue;
1983 dsc = tx->send+ENI_PRV_POS(skb)*4;
1984 writel((readl(dsc) & ~(MID_SEG_RATE | MID_SEG_PR)) |
1985 (tx->prescaler << MID_SEG_PR_SHIFT) |
1986 (tx->resolution << MID_SEG_RATE_SHIFT), dsc);
1987 }
1988 tasklet_enable(&eni_dev->task);
1989 return 0;
1990}
1991
1992
1993static int eni_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
1994{
1995 struct eni_dev *eni_dev = ENI_DEV(dev);
1996
1997 if (cmd == ENI_MEMDUMP) {
1998 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1999 printk(KERN_WARNING "Please use /proc/atm/" DEV_LABEL ":%d "
2000 "instead of obsolete ioctl ENI_MEMDUMP\n",dev->number);
2001 dump(dev);
2002 return 0;
2003 }
2004 if (cmd == ENI_SETMULT) {
2005 struct eni_multipliers mult;
2006
2007 if (!capable(CAP_NET_ADMIN)) return -EPERM;
2008 if (copy_from_user(&mult, arg,
2009 sizeof(struct eni_multipliers)))
2010 return -EFAULT;
2011 if ((mult.tx && mult.tx <= 100) || (mult.rx &&mult.rx <= 100) ||
2012 mult.tx > 65536 || mult.rx > 65536)
2013 return -EINVAL;
2014 if (mult.tx) eni_dev->tx_mult = mult.tx;
2015 if (mult.rx) eni_dev->rx_mult = mult.rx;
2016 return 0;
2017 }
2018 if (cmd == ATM_SETCIRANGE) {
2019 struct atm_cirange ci;
2020
2021 if (copy_from_user(&ci, arg,sizeof(struct atm_cirange)))
2022 return -EFAULT;
2023 if ((ci.vpi_bits == 0 || ci.vpi_bits == ATM_CI_MAX) &&
2024 (ci.vci_bits == NR_VCI_LD || ci.vpi_bits == ATM_CI_MAX))
2025 return 0;
2026 return -EINVAL;
2027 }
2028 if (!dev->phy->ioctl) return -ENOIOCTLCMD;
2029 return dev->phy->ioctl(dev,cmd,arg);
2030}
2031
2032static int eni_send(struct atm_vcc *vcc,struct sk_buff *skb)
2033{
2034 enum enq_res res;
2035
2036 DPRINTK(">eni_send\n");
2037 if (!ENI_VCC(vcc)->tx) {
2038 if (vcc->pop) vcc->pop(vcc,skb);
2039 else dev_kfree_skb(skb);
2040 return -EINVAL;
2041 }
2042 if (!skb) {
2043 printk(KERN_CRIT "!skb in eni_send ?\n");
2044 if (vcc->pop) vcc->pop(vcc,skb);
2045 return -EINVAL;
2046 }
2047 if (vcc->qos.aal == ATM_AAL0) {
2048 if (skb->len != ATM_CELL_SIZE-1) {
2049 if (vcc->pop) vcc->pop(vcc,skb);
2050 else dev_kfree_skb(skb);
2051 return -EINVAL;
2052 }
2053 *(u32 *) skb->data = htonl(*(u32 *) skb->data);
2054 }
2055 submitted++;
2056 ATM_SKB(skb)->vcc = vcc;
2057 tasklet_disable(&ENI_DEV(vcc->dev)->task);
2058 res = do_tx(skb);
2059 tasklet_enable(&ENI_DEV(vcc->dev)->task);
2060 if (res == enq_ok) return 0;
2061 skb_queue_tail(&ENI_VCC(vcc)->tx->backlog,skb);
2062 backlogged++;
2063 tasklet_schedule(&ENI_DEV(vcc->dev)->task);
2064 return 0;
2065}
2066
2067static void eni_phy_put(struct atm_dev *dev,unsigned char value,
2068 unsigned long addr)
2069{
2070 writel(value,ENI_DEV(dev)->phy+addr*4);
2071}
2072
2073
2074
2075static unsigned char eni_phy_get(struct atm_dev *dev,unsigned long addr)
2076{
2077 return readl(ENI_DEV(dev)->phy+addr*4);
2078}
2079
2080
2081static int eni_proc_read(struct atm_dev *dev,loff_t *pos,char *page)
2082{
2083 struct sock *s;
2084 static const char *signal[] = { "LOST","unknown","okay" };
2085 struct eni_dev *eni_dev = ENI_DEV(dev);
2086 struct atm_vcc *vcc;
2087 int left,i;
2088
2089 left = *pos;
2090 if (!left)
2091 return sprintf(page,DEV_LABEL "(itf %d) signal %s, %dkB, "
2092 "%d cps remaining\n",dev->number,signal[(int) dev->signal],
2093 eni_dev->mem >> 10,eni_dev->tx_bw);
2094 if (!--left)
2095 return sprintf(page,"%4sBursts: TX"
2096#if !defined(CONFIG_ATM_ENI_BURST_TX_16W) && \
2097 !defined(CONFIG_ATM_ENI_BURST_TX_8W) && \
2098 !defined(CONFIG_ATM_ENI_BURST_TX_4W) && \
2099 !defined(CONFIG_ATM_ENI_BURST_TX_2W)
2100 " none"
2101#endif
2102#ifdef CONFIG_ATM_ENI_BURST_TX_16W
2103 " 16W"
2104#endif
2105#ifdef CONFIG_ATM_ENI_BURST_TX_8W
2106 " 8W"
2107#endif
2108#ifdef CONFIG_ATM_ENI_BURST_TX_4W
2109 " 4W"
2110#endif
2111#ifdef CONFIG_ATM_ENI_BURST_TX_2W
2112 " 2W"
2113#endif
2114 ", RX"
2115#if !defined(CONFIG_ATM_ENI_BURST_RX_16W) && \
2116 !defined(CONFIG_ATM_ENI_BURST_RX_8W) && \
2117 !defined(CONFIG_ATM_ENI_BURST_RX_4W) && \
2118 !defined(CONFIG_ATM_ENI_BURST_RX_2W)
2119 " none"
2120#endif
2121#ifdef CONFIG_ATM_ENI_BURST_RX_16W
2122 " 16W"
2123#endif
2124#ifdef CONFIG_ATM_ENI_BURST_RX_8W
2125 " 8W"
2126#endif
2127#ifdef CONFIG_ATM_ENI_BURST_RX_4W
2128 " 4W"
2129#endif
2130#ifdef CONFIG_ATM_ENI_BURST_RX_2W
2131 " 2W"
2132#endif
2133#ifndef CONFIG_ATM_ENI_TUNE_BURST
2134 " (default)"
2135#endif
2136 "\n","");
2137 if (!--left)
2138 return sprintf(page,"%4sBuffer multipliers: tx %d%%, rx %d%%\n",
2139 "",eni_dev->tx_mult,eni_dev->rx_mult);
2140 for (i = 0; i < NR_CHAN; i++) {
2141 struct eni_tx *tx = eni_dev->tx+i;
2142
2143 if (!tx->send) continue;
2144 if (!--left) {
2145 return sprintf(page, "tx[%d]: 0x%lx-0x%lx "
2146 "(%6ld bytes), rsv %d cps, shp %d cps%s\n",i,
2147 (unsigned long) (tx->send - eni_dev->ram),
2148 tx->send-eni_dev->ram+tx->words*4-1,tx->words*4,
2149 tx->reserved,tx->shaping,
2150 tx == eni_dev->ubr ? " (UBR)" : "");
2151 }
2152 if (--left) continue;
2153 return sprintf(page,"%10sbacklog %u packets\n","",
2154 skb_queue_len(&tx->backlog));
2155 }
2156 read_lock(&vcc_sklist_lock);
2157 for(i = 0; i < VCC_HTABLE_SIZE; ++i) {
2158 struct hlist_head *head = &vcc_hash[i];
2159
2160 sk_for_each(s, head) {
2161 struct eni_vcc *eni_vcc;
2162 int length;
2163
2164 vcc = atm_sk(s);
2165 if (vcc->dev != dev)
2166 continue;
2167 eni_vcc = ENI_VCC(vcc);
2168 if (--left) continue;
2169 length = sprintf(page,"vcc %4d: ",vcc->vci);
2170 if (eni_vcc->rx) {
2171 length += sprintf(page+length, "0x%lx-0x%lx "
2172 "(%6ld bytes)",
2173 (unsigned long) (eni_vcc->recv - eni_dev->ram),
2174 eni_vcc->recv-eni_dev->ram+eni_vcc->words*4-1,
2175 eni_vcc->words*4);
2176 if (eni_vcc->tx) length += sprintf(page+length,", ");
2177 }
2178 if (eni_vcc->tx)
2179 length += sprintf(page+length,"tx[%d], txing %d bytes",
2180 eni_vcc->tx->index,eni_vcc->txing);
2181 page[length] = '\n';
2182 read_unlock(&vcc_sklist_lock);
2183 return length+1;
2184 }
2185 }
2186 read_unlock(&vcc_sklist_lock);
2187 for (i = 0; i < eni_dev->free_len; i++) {
2188 struct eni_free *fe = eni_dev->free_list+i;
2189 unsigned long offset;
2190
2191 if (--left) continue;
2192 offset = (unsigned long) eni_dev->ram+eni_dev->base_diff;
2193 return sprintf(page,"free %p-%p (%6d bytes)\n",
2194 fe->start-offset,fe->start-offset+(1 << fe->order)-1,
2195 1 << fe->order);
2196 }
2197 return 0;
2198}
2199
2200
2201static const struct atmdev_ops ops = {
2202 .open = eni_open,
2203 .close = eni_close,
2204 .ioctl = eni_ioctl,
2205 .send = eni_send,
2206 .phy_put = eni_phy_put,
2207 .phy_get = eni_phy_get,
2208 .change_qos = eni_change_qos,
2209 .proc_read = eni_proc_read
2210};
2211
2212
2213static int eni_init_one(struct pci_dev *pci_dev,
2214 const struct pci_device_id *ent)
2215{
2216 struct atm_dev *dev;
2217 struct eni_dev *eni_dev;
2218 struct eni_zero *zero;
2219 int rc;
2220
2221 rc = pci_enable_device(pci_dev);
2222 if (rc < 0)
2223 goto out;
2224
2225 rc = dma_set_mask_and_coherent(&pci_dev->dev, DMA_BIT_MASK(32));
2226 if (rc < 0)
2227 goto err_disable;
2228
2229 rc = -ENOMEM;
2230 eni_dev = kmalloc(sizeof(struct eni_dev), GFP_KERNEL);
2231 if (!eni_dev)
2232 goto err_disable;
2233
2234 zero = &eni_dev->zero;
2235 zero->addr = dma_alloc_coherent(&pci_dev->dev,
2236 ENI_ZEROES_SIZE, &zero->dma, GFP_KERNEL);
2237 if (!zero->addr)
2238 goto err_kfree;
2239
2240 dev = atm_dev_register(DEV_LABEL, &pci_dev->dev, &ops, -1, NULL);
2241 if (!dev)
2242 goto err_free_consistent;
2243
2244 dev->dev_data = eni_dev;
2245 pci_set_drvdata(pci_dev, dev);
2246 eni_dev->pci_dev = pci_dev;
2247 eni_dev->asic = ent->driver_data;
2248
2249 rc = eni_do_init(dev);
2250 if (rc < 0)
2251 goto err_unregister;
2252
2253 rc = eni_start(dev);
2254 if (rc < 0)
2255 goto err_eni_release;
2256
2257 eni_dev->more = eni_boards;
2258 eni_boards = dev;
2259out:
2260 return rc;
2261
2262err_eni_release:
2263 eni_do_release(dev);
2264err_unregister:
2265 atm_dev_deregister(dev);
2266err_free_consistent:
2267 dma_free_coherent(&pci_dev->dev, ENI_ZEROES_SIZE, zero->addr, zero->dma);
2268err_kfree:
2269 kfree(eni_dev);
2270err_disable:
2271 pci_disable_device(pci_dev);
2272 goto out;
2273}
2274
2275
2276static const struct pci_device_id eni_pci_tbl[] = {
2277 { PCI_VDEVICE(EF, PCI_DEVICE_ID_EF_ATM_FPGA), 0 /* FPGA */ },
2278 { PCI_VDEVICE(EF, PCI_DEVICE_ID_EF_ATM_ASIC), 1 /* ASIC */ },
2279 { 0, }
2280};
2281MODULE_DEVICE_TABLE(pci,eni_pci_tbl);
2282
2283
2284static void eni_remove_one(struct pci_dev *pdev)
2285{
2286 struct atm_dev *dev = pci_get_drvdata(pdev);
2287 struct eni_dev *ed = ENI_DEV(dev);
2288 struct eni_zero *zero = &ed->zero;
2289
2290 eni_do_release(dev);
2291 atm_dev_deregister(dev);
2292 dma_free_coherent(&pdev->dev, ENI_ZEROES_SIZE, zero->addr, zero->dma);
2293 kfree(ed);
2294 pci_disable_device(pdev);
2295}
2296
2297
2298static struct pci_driver eni_driver = {
2299 .name = DEV_LABEL,
2300 .id_table = eni_pci_tbl,
2301 .probe = eni_init_one,
2302 .remove = eni_remove_one,
2303};
2304
2305
2306static int __init eni_init(void)
2307{
2308 struct sk_buff *skb; /* dummy for sizeof */
2309
2310 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct eni_skb_prv));
2311 return pci_register_driver(&eni_driver);
2312}
2313
2314
2315module_init(eni_init);
2316/* @@@ since exit routine not defined, this module can not be unloaded */
2317
2318MODULE_LICENSE("GPL");
1/* drivers/atm/eni.c - Efficient Networks ENI155P device driver */
2
3/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5
6#include <linux/module.h>
7#include <linux/kernel.h>
8#include <linux/mm.h>
9#include <linux/pci.h>
10#include <linux/errno.h>
11#include <linux/atm.h>
12#include <linux/atmdev.h>
13#include <linux/sonet.h>
14#include <linux/skbuff.h>
15#include <linux/time.h>
16#include <linux/delay.h>
17#include <linux/uio.h>
18#include <linux/init.h>
19#include <linux/atm_eni.h>
20#include <linux/bitops.h>
21#include <linux/slab.h>
22#include <asm/system.h>
23#include <asm/io.h>
24#include <linux/atomic.h>
25#include <asm/uaccess.h>
26#include <asm/string.h>
27#include <asm/byteorder.h>
28
29#include "tonga.h"
30#include "midway.h"
31#include "suni.h"
32#include "eni.h"
33
34#if !defined(__i386__) && !defined(__x86_64__)
35#ifndef ioremap_nocache
36#define ioremap_nocache(X,Y) ioremap(X,Y)
37#endif
38#endif
39
40/*
41 * TODO:
42 *
43 * Show stoppers
44 * none
45 *
46 * Minor
47 * - OAM support
48 * - fix bugs listed below
49 */
50
51/*
52 * KNOWN BUGS:
53 *
54 * - may run into JK-JK bug and deadlock
55 * - should allocate UBR channel first
56 * - buffer space allocation algorithm is stupid
57 * (RX: should be maxSDU+maxdelay*rate
58 * TX: should be maxSDU+min(maxSDU,maxdelay*rate) )
59 * - doesn't support OAM cells
60 * - eni_put_free may hang if not putting memory fragments that _complete_
61 * 2^n block (never happens in real life, though)
62 */
63
64
65#if 0
66#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
67#else
68#define DPRINTK(format,args...)
69#endif
70
71
72#ifndef CONFIG_ATM_ENI_TUNE_BURST
73#define CONFIG_ATM_ENI_BURST_TX_8W
74#define CONFIG_ATM_ENI_BURST_RX_4W
75#endif
76
77
78#ifndef CONFIG_ATM_ENI_DEBUG
79
80
81#define NULLCHECK(x)
82
83#define EVENT(s,a,b)
84
85
86static void event_dump(void)
87{
88}
89
90
91#else
92
93
94/*
95 * NULL pointer checking
96 */
97
98#define NULLCHECK(x) \
99 if ((unsigned long) (x) < 0x30) \
100 printk(KERN_CRIT #x "==0x%lx\n",(unsigned long) (x))
101
102/*
103 * Very extensive activity logging. Greatly improves bug detection speed but
104 * costs a few Mbps if enabled.
105 */
106
107#define EV 64
108
109static const char *ev[EV];
110static unsigned long ev_a[EV],ev_b[EV];
111static int ec = 0;
112
113
114static void EVENT(const char *s,unsigned long a,unsigned long b)
115{
116 ev[ec] = s;
117 ev_a[ec] = a;
118 ev_b[ec] = b;
119 ec = (ec+1) % EV;
120}
121
122
123static void event_dump(void)
124{
125 int n,i;
126
127 for (n = 0; n < EV; n++) {
128 i = (ec+n) % EV;
129 printk(KERN_NOTICE);
130 printk(ev[i] ? ev[i] : "(null)",ev_a[i],ev_b[i]);
131 }
132}
133
134
135#endif /* CONFIG_ATM_ENI_DEBUG */
136
137
138/*
139 * NExx must not be equal at end
140 * EExx may be equal at end
141 * xxPJOK verify validity of pointer jumps
142 * xxPMOK operating on a circular buffer of "c" words
143 */
144
145#define NEPJOK(a0,a1,b) \
146 ((a0) < (a1) ? (b) <= (a0) || (b) > (a1) : (b) <= (a0) && (b) > (a1))
147#define EEPJOK(a0,a1,b) \
148 ((a0) < (a1) ? (b) < (a0) || (b) >= (a1) : (b) < (a0) && (b) >= (a1))
149#define NEPMOK(a0,d,b,c) NEPJOK(a0,(a0+d) & (c-1),b)
150#define EEPMOK(a0,d,b,c) EEPJOK(a0,(a0+d) & (c-1),b)
151
152
153static int tx_complete = 0,dma_complete = 0,queued = 0,requeued = 0,
154 backlogged = 0,rx_enqueued = 0,rx_dequeued = 0,pushed = 0,submitted = 0,
155 putting = 0;
156
157static struct atm_dev *eni_boards = NULL;
158
159static u32 *cpu_zeroes = NULL; /* aligned "magic" zeroes */
160static dma_addr_t zeroes;
161
162/* Read/write registers on card */
163#define eni_in(r) readl(eni_dev->reg+(r)*4)
164#define eni_out(v,r) writel((v),eni_dev->reg+(r)*4)
165
166
167/*-------------------------------- utilities --------------------------------*/
168
169
170static void dump_mem(struct eni_dev *eni_dev)
171{
172 int i;
173
174 for (i = 0; i < eni_dev->free_len; i++)
175 printk(KERN_DEBUG " %d: %p %d\n",i,
176 eni_dev->free_list[i].start,
177 1 << eni_dev->free_list[i].order);
178}
179
180
181static void dump(struct atm_dev *dev)
182{
183 struct eni_dev *eni_dev;
184
185 int i;
186
187 eni_dev = ENI_DEV(dev);
188 printk(KERN_NOTICE "Free memory\n");
189 dump_mem(eni_dev);
190 printk(KERN_NOTICE "TX buffers\n");
191 for (i = 0; i < NR_CHAN; i++)
192 if (eni_dev->tx[i].send)
193 printk(KERN_NOTICE " TX %d @ %p: %ld\n",i,
194 eni_dev->tx[i].send,eni_dev->tx[i].words*4);
195 printk(KERN_NOTICE "RX buffers\n");
196 for (i = 0; i < 1024; i++)
197 if (eni_dev->rx_map[i] && ENI_VCC(eni_dev->rx_map[i])->rx)
198 printk(KERN_NOTICE " RX %d @ %p: %ld\n",i,
199 ENI_VCC(eni_dev->rx_map[i])->recv,
200 ENI_VCC(eni_dev->rx_map[i])->words*4);
201 printk(KERN_NOTICE "----\n");
202}
203
204
205static void eni_put_free(struct eni_dev *eni_dev, void __iomem *start,
206 unsigned long size)
207{
208 struct eni_free *list;
209 int len,order;
210
211 DPRINTK("init 0x%lx+%ld(0x%lx)\n",start,size,size);
212 start += eni_dev->base_diff;
213 list = eni_dev->free_list;
214 len = eni_dev->free_len;
215 while (size) {
216 if (len >= eni_dev->free_list_size) {
217 printk(KERN_CRIT "eni_put_free overflow (%p,%ld)\n",
218 start,size);
219 break;
220 }
221 for (order = 0; !(((unsigned long)start | size) & (1 << order)); order++);
222 if (MID_MIN_BUF_SIZE > (1 << order)) {
223 printk(KERN_CRIT "eni_put_free: order %d too small\n",
224 order);
225 break;
226 }
227 list[len].start = (void __iomem *) start;
228 list[len].order = order;
229 len++;
230 start += 1 << order;
231 size -= 1 << order;
232 }
233 eni_dev->free_len = len;
234 /*dump_mem(eni_dev);*/
235}
236
237
238static void __iomem *eni_alloc_mem(struct eni_dev *eni_dev, unsigned long *size)
239{
240 struct eni_free *list;
241 void __iomem *start;
242 int len,i,order,best_order,index;
243
244 list = eni_dev->free_list;
245 len = eni_dev->free_len;
246 if (*size < MID_MIN_BUF_SIZE) *size = MID_MIN_BUF_SIZE;
247 if (*size > MID_MAX_BUF_SIZE) return NULL;
248 for (order = 0; (1 << order) < *size; order++);
249 DPRINTK("trying: %ld->%d\n",*size,order);
250 best_order = 65; /* we don't have more than 2^64 of anything ... */
251 index = 0; /* silence GCC */
252 for (i = 0; i < len; i++)
253 if (list[i].order == order) {
254 best_order = order;
255 index = i;
256 break;
257 }
258 else if (best_order > list[i].order && list[i].order > order) {
259 best_order = list[i].order;
260 index = i;
261 }
262 if (best_order == 65) return NULL;
263 start = list[index].start-eni_dev->base_diff;
264 list[index] = list[--len];
265 eni_dev->free_len = len;
266 *size = 1 << order;
267 eni_put_free(eni_dev,start+*size,(1 << best_order)-*size);
268 DPRINTK("%ld bytes (order %d) at 0x%lx\n",*size,order,start);
269 memset_io(start,0,*size); /* never leak data */
270 /*dump_mem(eni_dev);*/
271 return start;
272}
273
274
275static void eni_free_mem(struct eni_dev *eni_dev, void __iomem *start,
276 unsigned long size)
277{
278 struct eni_free *list;
279 int len,i,order;
280
281 start += eni_dev->base_diff;
282 list = eni_dev->free_list;
283 len = eni_dev->free_len;
284 for (order = -1; size; order++) size >>= 1;
285 DPRINTK("eni_free_mem: %p+0x%lx (order %d)\n",start,size,order);
286 for (i = 0; i < len; i++)
287 if (((unsigned long) list[i].start) == ((unsigned long)start^(1 << order)) &&
288 list[i].order == order) {
289 DPRINTK("match[%d]: 0x%lx/0x%lx(0x%x), %d/%d\n",i,
290 list[i].start,start,1 << order,list[i].order,order);
291 list[i] = list[--len];
292 start = (void __iomem *) ((unsigned long) start & ~(unsigned long) (1 << order));
293 order++;
294 i = -1;
295 continue;
296 }
297 if (len >= eni_dev->free_list_size) {
298 printk(KERN_ALERT "eni_free_mem overflow (%p,%d)\n",start,
299 order);
300 return;
301 }
302 list[len].start = start;
303 list[len].order = order;
304 eni_dev->free_len = len+1;
305 /*dump_mem(eni_dev);*/
306}
307
308
309/*----------------------------------- RX ------------------------------------*/
310
311
312#define ENI_VCC_NOS ((struct atm_vcc *) 1)
313
314
315static void rx_ident_err(struct atm_vcc *vcc)
316{
317 struct atm_dev *dev;
318 struct eni_dev *eni_dev;
319 struct eni_vcc *eni_vcc;
320
321 dev = vcc->dev;
322 eni_dev = ENI_DEV(dev);
323 /* immediately halt adapter */
324 eni_out(eni_in(MID_MC_S) &
325 ~(MID_DMA_ENABLE | MID_TX_ENABLE | MID_RX_ENABLE),MID_MC_S);
326 /* dump useful information */
327 eni_vcc = ENI_VCC(vcc);
328 printk(KERN_ALERT DEV_LABEL "(itf %d): driver error - RX ident "
329 "mismatch\n",dev->number);
330 printk(KERN_ALERT " VCI %d, rxing %d, words %ld\n",vcc->vci,
331 eni_vcc->rxing,eni_vcc->words);
332 printk(KERN_ALERT " host descr 0x%lx, rx pos 0x%lx, descr value "
333 "0x%x\n",eni_vcc->descr,eni_vcc->rx_pos,
334 (unsigned) readl(eni_vcc->recv+eni_vcc->descr*4));
335 printk(KERN_ALERT " last %p, servicing %d\n",eni_vcc->last,
336 eni_vcc->servicing);
337 EVENT("---dump ends here---\n",0,0);
338 printk(KERN_NOTICE "---recent events---\n");
339 event_dump();
340 ENI_DEV(dev)->fast = NULL; /* really stop it */
341 ENI_DEV(dev)->slow = NULL;
342 skb_queue_head_init(&ENI_DEV(dev)->rx_queue);
343}
344
345
346static int do_rx_dma(struct atm_vcc *vcc,struct sk_buff *skb,
347 unsigned long skip,unsigned long size,unsigned long eff)
348{
349 struct eni_dev *eni_dev;
350 struct eni_vcc *eni_vcc;
351 u32 dma_rd,dma_wr;
352 u32 dma[RX_DMA_BUF*2];
353 dma_addr_t paddr;
354 unsigned long here;
355 int i,j;
356
357 eni_dev = ENI_DEV(vcc->dev);
358 eni_vcc = ENI_VCC(vcc);
359 paddr = 0; /* GCC, shut up */
360 if (skb) {
361 paddr = pci_map_single(eni_dev->pci_dev,skb->data,skb->len,
362 PCI_DMA_FROMDEVICE);
363 ENI_PRV_PADDR(skb) = paddr;
364 if (paddr & 3)
365 printk(KERN_CRIT DEV_LABEL "(itf %d): VCI %d has "
366 "mis-aligned RX data (0x%lx)\n",vcc->dev->number,
367 vcc->vci,(unsigned long) paddr);
368 ENI_PRV_SIZE(skb) = size+skip;
369 /* PDU plus descriptor */
370 ATM_SKB(skb)->vcc = vcc;
371 }
372 j = 0;
373 if ((eff && skip) || 1) { /* @@@ actually, skip is always == 1 ... */
374 here = (eni_vcc->descr+skip) & (eni_vcc->words-1);
375 dma[j++] = (here << MID_DMA_COUNT_SHIFT) | (vcc->vci
376 << MID_DMA_VCI_SHIFT) | MID_DT_JK;
377 j++;
378 }
379 here = (eni_vcc->descr+size+skip) & (eni_vcc->words-1);
380 if (!eff) size += skip;
381 else {
382 unsigned long words;
383
384 if (!size) {
385 DPRINTK("strange things happen ...\n");
386 EVENT("strange things happen ... (skip=%ld,eff=%ld)\n",
387 size,eff);
388 }
389 words = eff;
390 if (paddr & 15) {
391 unsigned long init;
392
393 init = 4-((paddr & 15) >> 2);
394 if (init > words) init = words;
395 dma[j++] = MID_DT_WORD | (init << MID_DMA_COUNT_SHIFT) |
396 (vcc->vci << MID_DMA_VCI_SHIFT);
397 dma[j++] = paddr;
398 paddr += init << 2;
399 words -= init;
400 }
401#ifdef CONFIG_ATM_ENI_BURST_RX_16W /* may work with some PCI chipsets ... */
402 if (words & ~15) {
403 dma[j++] = MID_DT_16W | ((words >> 4) <<
404 MID_DMA_COUNT_SHIFT) | (vcc->vci <<
405 MID_DMA_VCI_SHIFT);
406 dma[j++] = paddr;
407 paddr += (words & ~15) << 2;
408 words &= 15;
409 }
410#endif
411#ifdef CONFIG_ATM_ENI_BURST_RX_8W /* works only with *some* PCI chipsets ... */
412 if (words & ~7) {
413 dma[j++] = MID_DT_8W | ((words >> 3) <<
414 MID_DMA_COUNT_SHIFT) | (vcc->vci <<
415 MID_DMA_VCI_SHIFT);
416 dma[j++] = paddr;
417 paddr += (words & ~7) << 2;
418 words &= 7;
419 }
420#endif
421#ifdef CONFIG_ATM_ENI_BURST_RX_4W /* recommended */
422 if (words & ~3) {
423 dma[j++] = MID_DT_4W | ((words >> 2) <<
424 MID_DMA_COUNT_SHIFT) | (vcc->vci <<
425 MID_DMA_VCI_SHIFT);
426 dma[j++] = paddr;
427 paddr += (words & ~3) << 2;
428 words &= 3;
429 }
430#endif
431#ifdef CONFIG_ATM_ENI_BURST_RX_2W /* probably useless if RX_4W, RX_8W, ... */
432 if (words & ~1) {
433 dma[j++] = MID_DT_2W | ((words >> 1) <<
434 MID_DMA_COUNT_SHIFT) | (vcc->vci <<
435 MID_DMA_VCI_SHIFT);
436 dma[j++] = paddr;
437 paddr += (words & ~1) << 2;
438 words &= 1;
439 }
440#endif
441 if (words) {
442 dma[j++] = MID_DT_WORD | (words << MID_DMA_COUNT_SHIFT)
443 | (vcc->vci << MID_DMA_VCI_SHIFT);
444 dma[j++] = paddr;
445 }
446 }
447 if (size != eff) {
448 dma[j++] = (here << MID_DMA_COUNT_SHIFT) |
449 (vcc->vci << MID_DMA_VCI_SHIFT) | MID_DT_JK;
450 j++;
451 }
452 if (!j || j > 2*RX_DMA_BUF) {
453 printk(KERN_CRIT DEV_LABEL "!j or j too big!!!\n");
454 goto trouble;
455 }
456 dma[j-2] |= MID_DMA_END;
457 j = j >> 1;
458 dma_wr = eni_in(MID_DMA_WR_RX);
459 dma_rd = eni_in(MID_DMA_RD_RX);
460 /*
461 * Can I move the dma_wr pointer by 2j+1 positions without overwriting
462 * data that hasn't been read (position of dma_rd) yet ?
463 */
464 if (!NEPMOK(dma_wr,j+j+1,dma_rd,NR_DMA_RX)) { /* @@@ +1 is ugly */
465 printk(KERN_WARNING DEV_LABEL "(itf %d): RX DMA full\n",
466 vcc->dev->number);
467 goto trouble;
468 }
469 for (i = 0; i < j; i++) {
470 writel(dma[i*2],eni_dev->rx_dma+dma_wr*8);
471 writel(dma[i*2+1],eni_dev->rx_dma+dma_wr*8+4);
472 dma_wr = (dma_wr+1) & (NR_DMA_RX-1);
473 }
474 if (skb) {
475 ENI_PRV_POS(skb) = eni_vcc->descr+size+1;
476 skb_queue_tail(&eni_dev->rx_queue,skb);
477 eni_vcc->last = skb;
478rx_enqueued++;
479 }
480 eni_vcc->descr = here;
481 eni_out(dma_wr,MID_DMA_WR_RX);
482 return 0;
483
484trouble:
485 if (paddr)
486 pci_unmap_single(eni_dev->pci_dev,paddr,skb->len,
487 PCI_DMA_FROMDEVICE);
488 if (skb) dev_kfree_skb_irq(skb);
489 return -1;
490}
491
492
493static void discard(struct atm_vcc *vcc,unsigned long size)
494{
495 struct eni_vcc *eni_vcc;
496
497 eni_vcc = ENI_VCC(vcc);
498 EVENT("discard (size=%ld)\n",size,0);
499 while (do_rx_dma(vcc,NULL,1,size,0)) EVENT("BUSY LOOP",0,0);
500 /* could do a full fallback, but that might be more expensive */
501 if (eni_vcc->rxing) ENI_PRV_POS(eni_vcc->last) += size+1;
502 else eni_vcc->rx_pos = (eni_vcc->rx_pos+size+1) & (eni_vcc->words-1);
503}
504
505
506/*
507 * TODO: should check whether direct copies (without DMA setup, dequeuing on
508 * interrupt, etc.) aren't much faster for AAL0
509 */
510
511static int rx_aal0(struct atm_vcc *vcc)
512{
513 struct eni_vcc *eni_vcc;
514 unsigned long descr;
515 unsigned long length;
516 struct sk_buff *skb;
517
518 DPRINTK(">rx_aal0\n");
519 eni_vcc = ENI_VCC(vcc);
520 descr = readl(eni_vcc->recv+eni_vcc->descr*4);
521 if ((descr & MID_RED_IDEN) != (MID_RED_RX_ID << MID_RED_SHIFT)) {
522 rx_ident_err(vcc);
523 return 1;
524 }
525 if (descr & MID_RED_T) {
526 DPRINTK(DEV_LABEL "(itf %d): trashing empty cell\n",
527 vcc->dev->number);
528 length = 0;
529 atomic_inc(&vcc->stats->rx_err);
530 }
531 else {
532 length = ATM_CELL_SIZE-1; /* no HEC */
533 }
534 skb = length ? atm_alloc_charge(vcc,length,GFP_ATOMIC) : NULL;
535 if (!skb) {
536 discard(vcc,length >> 2);
537 return 0;
538 }
539 skb_put(skb,length);
540 skb->tstamp = eni_vcc->timestamp;
541 DPRINTK("got len %ld\n",length);
542 if (do_rx_dma(vcc,skb,1,length >> 2,length >> 2)) return 1;
543 eni_vcc->rxing++;
544 return 0;
545}
546
547
548static int rx_aal5(struct atm_vcc *vcc)
549{
550 struct eni_vcc *eni_vcc;
551 unsigned long descr;
552 unsigned long size,eff,length;
553 struct sk_buff *skb;
554
555 EVENT("rx_aal5\n",0,0);
556 DPRINTK(">rx_aal5\n");
557 eni_vcc = ENI_VCC(vcc);
558 descr = readl(eni_vcc->recv+eni_vcc->descr*4);
559 if ((descr & MID_RED_IDEN) != (MID_RED_RX_ID << MID_RED_SHIFT)) {
560 rx_ident_err(vcc);
561 return 1;
562 }
563 if (descr & (MID_RED_T | MID_RED_CRC_ERR)) {
564 if (descr & MID_RED_T) {
565 EVENT("empty cell (descr=0x%lx)\n",descr,0);
566 DPRINTK(DEV_LABEL "(itf %d): trashing empty cell\n",
567 vcc->dev->number);
568 size = 0;
569 }
570 else {
571 static unsigned long silence = 0;
572
573 if (time_after(jiffies, silence) || silence == 0) {
574 printk(KERN_WARNING DEV_LABEL "(itf %d): "
575 "discarding PDU(s) with CRC error\n",
576 vcc->dev->number);
577 silence = (jiffies+2*HZ)|1;
578 }
579 size = (descr & MID_RED_COUNT)*(ATM_CELL_PAYLOAD >> 2);
580 EVENT("CRC error (descr=0x%lx,size=%ld)\n",descr,
581 size);
582 }
583 eff = length = 0;
584 atomic_inc(&vcc->stats->rx_err);
585 }
586 else {
587 size = (descr & MID_RED_COUNT)*(ATM_CELL_PAYLOAD >> 2);
588 DPRINTK("size=%ld\n",size);
589 length = readl(eni_vcc->recv+(((eni_vcc->descr+size-1) &
590 (eni_vcc->words-1)))*4) & 0xffff;
591 /* -trailer(2)+header(1) */
592 if (length && length <= (size << 2)-8 && length <=
593 ATM_MAX_AAL5_PDU) eff = (length+3) >> 2;
594 else { /* ^ trailer length (8) */
595 EVENT("bad PDU (descr=0x08%lx,length=%ld)\n",descr,
596 length);
597 printk(KERN_ERR DEV_LABEL "(itf %d): bad AAL5 PDU "
598 "(VCI=%d,length=%ld,size=%ld (descr 0x%lx))\n",
599 vcc->dev->number,vcc->vci,length,size << 2,descr);
600 length = eff = 0;
601 atomic_inc(&vcc->stats->rx_err);
602 }
603 }
604 skb = eff ? atm_alloc_charge(vcc,eff << 2,GFP_ATOMIC) : NULL;
605 if (!skb) {
606 discard(vcc,size);
607 return 0;
608 }
609 skb_put(skb,length);
610 DPRINTK("got len %ld\n",length);
611 if (do_rx_dma(vcc,skb,1,size,eff)) return 1;
612 eni_vcc->rxing++;
613 return 0;
614}
615
616
617static inline int rx_vcc(struct atm_vcc *vcc)
618{
619 void __iomem *vci_dsc;
620 unsigned long tmp;
621 struct eni_vcc *eni_vcc;
622
623 eni_vcc = ENI_VCC(vcc);
624 vci_dsc = ENI_DEV(vcc->dev)->vci+vcc->vci*16;
625 EVENT("rx_vcc(1)\n",0,0);
626 while (eni_vcc->descr != (tmp = (readl(vci_dsc+4) & MID_VCI_DESCR) >>
627 MID_VCI_DESCR_SHIFT)) {
628 EVENT("rx_vcc(2: host dsc=0x%lx, nic dsc=0x%lx)\n",
629 eni_vcc->descr,tmp);
630 DPRINTK("CB_DESCR %ld REG_DESCR %d\n",ENI_VCC(vcc)->descr,
631 (((unsigned) readl(vci_dsc+4) & MID_VCI_DESCR) >>
632 MID_VCI_DESCR_SHIFT));
633 if (ENI_VCC(vcc)->rx(vcc)) return 1;
634 }
635 /* clear IN_SERVICE flag */
636 writel(readl(vci_dsc) & ~MID_VCI_IN_SERVICE,vci_dsc);
637 /*
638 * If new data has arrived between evaluating the while condition and
639 * clearing IN_SERVICE, we wouldn't be notified until additional data
640 * follows. So we have to loop again to be sure.
641 */
642 EVENT("rx_vcc(3)\n",0,0);
643 while (ENI_VCC(vcc)->descr != (tmp = (readl(vci_dsc+4) & MID_VCI_DESCR)
644 >> MID_VCI_DESCR_SHIFT)) {
645 EVENT("rx_vcc(4: host dsc=0x%lx, nic dsc=0x%lx)\n",
646 eni_vcc->descr,tmp);
647 DPRINTK("CB_DESCR %ld REG_DESCR %d\n",ENI_VCC(vcc)->descr,
648 (((unsigned) readl(vci_dsc+4) & MID_VCI_DESCR) >>
649 MID_VCI_DESCR_SHIFT));
650 if (ENI_VCC(vcc)->rx(vcc)) return 1;
651 }
652 return 0;
653}
654
655
656static void poll_rx(struct atm_dev *dev)
657{
658 struct eni_dev *eni_dev;
659 struct atm_vcc *curr;
660
661 eni_dev = ENI_DEV(dev);
662 while ((curr = eni_dev->fast)) {
663 EVENT("poll_rx.fast\n",0,0);
664 if (rx_vcc(curr)) return;
665 eni_dev->fast = ENI_VCC(curr)->next;
666 ENI_VCC(curr)->next = ENI_VCC_NOS;
667 barrier();
668 ENI_VCC(curr)->servicing--;
669 }
670 while ((curr = eni_dev->slow)) {
671 EVENT("poll_rx.slow\n",0,0);
672 if (rx_vcc(curr)) return;
673 eni_dev->slow = ENI_VCC(curr)->next;
674 ENI_VCC(curr)->next = ENI_VCC_NOS;
675 barrier();
676 ENI_VCC(curr)->servicing--;
677 }
678}
679
680
681static void get_service(struct atm_dev *dev)
682{
683 struct eni_dev *eni_dev;
684 struct atm_vcc *vcc;
685 unsigned long vci;
686
687 DPRINTK(">get_service\n");
688 eni_dev = ENI_DEV(dev);
689 while (eni_in(MID_SERV_WRITE) != eni_dev->serv_read) {
690 vci = readl(eni_dev->service+eni_dev->serv_read*4);
691 eni_dev->serv_read = (eni_dev->serv_read+1) & (NR_SERVICE-1);
692 vcc = eni_dev->rx_map[vci & 1023];
693 if (!vcc) {
694 printk(KERN_CRIT DEV_LABEL "(itf %d): VCI %ld not "
695 "found\n",dev->number,vci);
696 continue; /* nasty but we try to go on anyway */
697 /* @@@ nope, doesn't work */
698 }
699 EVENT("getting from service\n",0,0);
700 if (ENI_VCC(vcc)->next != ENI_VCC_NOS) {
701 EVENT("double service\n",0,0);
702 DPRINTK("Grr, servicing VCC %ld twice\n",vci);
703 continue;
704 }
705 ENI_VCC(vcc)->timestamp = ktime_get_real();
706 ENI_VCC(vcc)->next = NULL;
707 if (vcc->qos.rxtp.traffic_class == ATM_CBR) {
708 if (eni_dev->fast)
709 ENI_VCC(eni_dev->last_fast)->next = vcc;
710 else eni_dev->fast = vcc;
711 eni_dev->last_fast = vcc;
712 }
713 else {
714 if (eni_dev->slow)
715 ENI_VCC(eni_dev->last_slow)->next = vcc;
716 else eni_dev->slow = vcc;
717 eni_dev->last_slow = vcc;
718 }
719putting++;
720 ENI_VCC(vcc)->servicing++;
721 }
722}
723
724
725static void dequeue_rx(struct atm_dev *dev)
726{
727 struct eni_dev *eni_dev;
728 struct eni_vcc *eni_vcc;
729 struct atm_vcc *vcc;
730 struct sk_buff *skb;
731 void __iomem *vci_dsc;
732 int first;
733
734 eni_dev = ENI_DEV(dev);
735 first = 1;
736 while (1) {
737 skb = skb_dequeue(&eni_dev->rx_queue);
738 if (!skb) {
739 if (first) {
740 DPRINTK(DEV_LABEL "(itf %d): RX but not "
741 "rxing\n",dev->number);
742 EVENT("nothing to dequeue\n",0,0);
743 }
744 break;
745 }
746 EVENT("dequeued (size=%ld,pos=0x%lx)\n",ENI_PRV_SIZE(skb),
747 ENI_PRV_POS(skb));
748rx_dequeued++;
749 vcc = ATM_SKB(skb)->vcc;
750 eni_vcc = ENI_VCC(vcc);
751 first = 0;
752 vci_dsc = eni_dev->vci+vcc->vci*16;
753 if (!EEPMOK(eni_vcc->rx_pos,ENI_PRV_SIZE(skb),
754 (readl(vci_dsc+4) & MID_VCI_READ) >> MID_VCI_READ_SHIFT,
755 eni_vcc->words)) {
756 EVENT("requeuing\n",0,0);
757 skb_queue_head(&eni_dev->rx_queue,skb);
758 break;
759 }
760 eni_vcc->rxing--;
761 eni_vcc->rx_pos = ENI_PRV_POS(skb) & (eni_vcc->words-1);
762 pci_unmap_single(eni_dev->pci_dev,ENI_PRV_PADDR(skb),skb->len,
763 PCI_DMA_TODEVICE);
764 if (!skb->len) dev_kfree_skb_irq(skb);
765 else {
766 EVENT("pushing (len=%ld)\n",skb->len,0);
767 if (vcc->qos.aal == ATM_AAL0)
768 *(unsigned long *) skb->data =
769 ntohl(*(unsigned long *) skb->data);
770 memset(skb->cb,0,sizeof(struct eni_skb_prv));
771 vcc->push(vcc,skb);
772 pushed++;
773 }
774 atomic_inc(&vcc->stats->rx);
775 }
776 wake_up(&eni_dev->rx_wait);
777}
778
779
780static int open_rx_first(struct atm_vcc *vcc)
781{
782 struct eni_dev *eni_dev;
783 struct eni_vcc *eni_vcc;
784 unsigned long size;
785
786 DPRINTK("open_rx_first\n");
787 eni_dev = ENI_DEV(vcc->dev);
788 eni_vcc = ENI_VCC(vcc);
789 eni_vcc->rx = NULL;
790 if (vcc->qos.rxtp.traffic_class == ATM_NONE) return 0;
791 size = vcc->qos.rxtp.max_sdu*eni_dev->rx_mult/100;
792 if (size > MID_MAX_BUF_SIZE && vcc->qos.rxtp.max_sdu <=
793 MID_MAX_BUF_SIZE)
794 size = MID_MAX_BUF_SIZE;
795 eni_vcc->recv = eni_alloc_mem(eni_dev,&size);
796 DPRINTK("rx at 0x%lx\n",eni_vcc->recv);
797 eni_vcc->words = size >> 2;
798 if (!eni_vcc->recv) return -ENOBUFS;
799 eni_vcc->rx = vcc->qos.aal == ATM_AAL5 ? rx_aal5 : rx_aal0;
800 eni_vcc->descr = 0;
801 eni_vcc->rx_pos = 0;
802 eni_vcc->rxing = 0;
803 eni_vcc->servicing = 0;
804 eni_vcc->next = ENI_VCC_NOS;
805 return 0;
806}
807
808
809static int open_rx_second(struct atm_vcc *vcc)
810{
811 void __iomem *here;
812 struct eni_dev *eni_dev;
813 struct eni_vcc *eni_vcc;
814 unsigned long size;
815 int order;
816
817 DPRINTK("open_rx_second\n");
818 eni_dev = ENI_DEV(vcc->dev);
819 eni_vcc = ENI_VCC(vcc);
820 if (!eni_vcc->rx) return 0;
821 /* set up VCI descriptor */
822 here = eni_dev->vci+vcc->vci*16;
823 DPRINTK("loc 0x%x\n",(unsigned) (eni_vcc->recv-eni_dev->ram)/4);
824 size = eni_vcc->words >> 8;
825 for (order = -1; size; order++) size >>= 1;
826 writel(0,here+4); /* descr, read = 0 */
827 writel(0,here+8); /* write, state, count = 0 */
828 if (eni_dev->rx_map[vcc->vci])
829 printk(KERN_CRIT DEV_LABEL "(itf %d): BUG - VCI %d already "
830 "in use\n",vcc->dev->number,vcc->vci);
831 eni_dev->rx_map[vcc->vci] = vcc; /* now it counts */
832 writel(((vcc->qos.aal != ATM_AAL5 ? MID_MODE_RAW : MID_MODE_AAL5) <<
833 MID_VCI_MODE_SHIFT) | MID_VCI_PTI_MODE |
834 (((eni_vcc->recv-eni_dev->ram) >> (MID_LOC_SKIP+2)) <<
835 MID_VCI_LOCATION_SHIFT) | (order << MID_VCI_SIZE_SHIFT),here);
836 return 0;
837}
838
839
840static void close_rx(struct atm_vcc *vcc)
841{
842 DECLARE_WAITQUEUE(wait,current);
843 void __iomem *here;
844 struct eni_dev *eni_dev;
845 struct eni_vcc *eni_vcc;
846
847 eni_vcc = ENI_VCC(vcc);
848 if (!eni_vcc->rx) return;
849 eni_dev = ENI_DEV(vcc->dev);
850 if (vcc->vpi != ATM_VPI_UNSPEC && vcc->vci != ATM_VCI_UNSPEC) {
851 here = eni_dev->vci+vcc->vci*16;
852 /* block receiver */
853 writel((readl(here) & ~MID_VCI_MODE) | (MID_MODE_TRASH <<
854 MID_VCI_MODE_SHIFT),here);
855 /* wait for receiver to become idle */
856 udelay(27);
857 /* discard pending cell */
858 writel(readl(here) & ~MID_VCI_IN_SERVICE,here);
859 /* don't accept any new ones */
860 eni_dev->rx_map[vcc->vci] = NULL;
861 /* wait for RX queue to drain */
862 DPRINTK("eni_close: waiting for RX ...\n");
863 EVENT("RX closing\n",0,0);
864 add_wait_queue(&eni_dev->rx_wait,&wait);
865 set_current_state(TASK_UNINTERRUPTIBLE);
866 barrier();
867 for (;;) {
868 /* transition service->rx: rxing++, servicing-- */
869 if (!eni_vcc->servicing) {
870 barrier();
871 if (!eni_vcc->rxing) break;
872 }
873 EVENT("drain PDUs (rx %ld, serv %ld)\n",eni_vcc->rxing,
874 eni_vcc->servicing);
875 printk(KERN_INFO "%d+%d RX left\n",eni_vcc->servicing,
876 eni_vcc->rxing);
877 schedule();
878 set_current_state(TASK_UNINTERRUPTIBLE);
879 }
880 for (;;) {
881 int at_end;
882 u32 tmp;
883
884 tasklet_disable(&eni_dev->task);
885 tmp = readl(eni_dev->vci+vcc->vci*16+4) & MID_VCI_READ;
886 at_end = eni_vcc->rx_pos == tmp >> MID_VCI_READ_SHIFT;
887 tasklet_enable(&eni_dev->task);
888 if (at_end) break;
889 EVENT("drain discard (host 0x%lx, nic 0x%lx)\n",
890 eni_vcc->rx_pos,tmp);
891 printk(KERN_INFO "draining RX: host 0x%lx, nic 0x%x\n",
892 eni_vcc->rx_pos,tmp);
893 schedule();
894 set_current_state(TASK_UNINTERRUPTIBLE);
895 }
896 set_current_state(TASK_RUNNING);
897 remove_wait_queue(&eni_dev->rx_wait,&wait);
898 }
899 eni_free_mem(eni_dev,eni_vcc->recv,eni_vcc->words << 2);
900 eni_vcc->rx = NULL;
901}
902
903
904static int start_rx(struct atm_dev *dev)
905{
906 struct eni_dev *eni_dev;
907
908 eni_dev = ENI_DEV(dev);
909 eni_dev->rx_map = (struct atm_vcc **) get_zeroed_page(GFP_KERNEL);
910 if (!eni_dev->rx_map) {
911 printk(KERN_ERR DEV_LABEL "(itf %d): couldn't get free page\n",
912 dev->number);
913 free_page((unsigned long) eni_dev->free_list);
914 return -ENOMEM;
915 }
916 eni_dev->rx_mult = DEFAULT_RX_MULT;
917 eni_dev->fast = eni_dev->last_fast = NULL;
918 eni_dev->slow = eni_dev->last_slow = NULL;
919 init_waitqueue_head(&eni_dev->rx_wait);
920 skb_queue_head_init(&eni_dev->rx_queue);
921 eni_dev->serv_read = eni_in(MID_SERV_WRITE);
922 eni_out(0,MID_DMA_WR_RX);
923 return 0;
924}
925
926
927/*----------------------------------- TX ------------------------------------*/
928
929
930enum enq_res { enq_ok,enq_next,enq_jam };
931
932
933static inline void put_dma(int chan,u32 *dma,int *j,dma_addr_t paddr,
934 u32 size)
935{
936 u32 init,words;
937
938 DPRINTK("put_dma: 0x%lx+0x%x\n",(unsigned long) paddr,size);
939 EVENT("put_dma: 0x%lx+0x%lx\n",(unsigned long) paddr,size);
940#if 0 /* don't complain anymore */
941 if (paddr & 3)
942 printk(KERN_ERR "put_dma: unaligned addr (0x%lx)\n",paddr);
943 if (size & 3)
944 printk(KERN_ERR "put_dma: unaligned size (0x%lx)\n",size);
945#endif
946 if (paddr & 3) {
947 init = 4-(paddr & 3);
948 if (init > size || size < 7) init = size;
949 DPRINTK("put_dma: %lx DMA: %d/%d bytes\n",
950 (unsigned long) paddr,init,size);
951 dma[(*j)++] = MID_DT_BYTE | (init << MID_DMA_COUNT_SHIFT) |
952 (chan << MID_DMA_CHAN_SHIFT);
953 dma[(*j)++] = paddr;
954 paddr += init;
955 size -= init;
956 }
957 words = size >> 2;
958 size &= 3;
959 if (words && (paddr & 31)) {
960 init = 8-((paddr & 31) >> 2);
961 if (init > words) init = words;
962 DPRINTK("put_dma: %lx DMA: %d/%d words\n",
963 (unsigned long) paddr,init,words);
964 dma[(*j)++] = MID_DT_WORD | (init << MID_DMA_COUNT_SHIFT) |
965 (chan << MID_DMA_CHAN_SHIFT);
966 dma[(*j)++] = paddr;
967 paddr += init << 2;
968 words -= init;
969 }
970#ifdef CONFIG_ATM_ENI_BURST_TX_16W /* may work with some PCI chipsets ... */
971 if (words & ~15) {
972 DPRINTK("put_dma: %lx DMA: %d*16/%d words\n",
973 (unsigned long) paddr,words >> 4,words);
974 dma[(*j)++] = MID_DT_16W | ((words >> 4) << MID_DMA_COUNT_SHIFT)
975 | (chan << MID_DMA_CHAN_SHIFT);
976 dma[(*j)++] = paddr;
977 paddr += (words & ~15) << 2;
978 words &= 15;
979 }
980#endif
981#ifdef CONFIG_ATM_ENI_BURST_TX_8W /* recommended */
982 if (words & ~7) {
983 DPRINTK("put_dma: %lx DMA: %d*8/%d words\n",
984 (unsigned long) paddr,words >> 3,words);
985 dma[(*j)++] = MID_DT_8W | ((words >> 3) << MID_DMA_COUNT_SHIFT)
986 | (chan << MID_DMA_CHAN_SHIFT);
987 dma[(*j)++] = paddr;
988 paddr += (words & ~7) << 2;
989 words &= 7;
990 }
991#endif
992#ifdef CONFIG_ATM_ENI_BURST_TX_4W /* probably useless if TX_8W or TX_16W */
993 if (words & ~3) {
994 DPRINTK("put_dma: %lx DMA: %d*4/%d words\n",
995 (unsigned long) paddr,words >> 2,words);
996 dma[(*j)++] = MID_DT_4W | ((words >> 2) << MID_DMA_COUNT_SHIFT)
997 | (chan << MID_DMA_CHAN_SHIFT);
998 dma[(*j)++] = paddr;
999 paddr += (words & ~3) << 2;
1000 words &= 3;
1001 }
1002#endif
1003#ifdef CONFIG_ATM_ENI_BURST_TX_2W /* probably useless if TX_4W, TX_8W, ... */
1004 if (words & ~1) {
1005 DPRINTK("put_dma: %lx DMA: %d*2/%d words\n",
1006 (unsigned long) paddr,words >> 1,words);
1007 dma[(*j)++] = MID_DT_2W | ((words >> 1) << MID_DMA_COUNT_SHIFT)
1008 | (chan << MID_DMA_CHAN_SHIFT);
1009 dma[(*j)++] = paddr;
1010 paddr += (words & ~1) << 2;
1011 words &= 1;
1012 }
1013#endif
1014 if (words) {
1015 DPRINTK("put_dma: %lx DMA: %d words\n",(unsigned long) paddr,
1016 words);
1017 dma[(*j)++] = MID_DT_WORD | (words << MID_DMA_COUNT_SHIFT) |
1018 (chan << MID_DMA_CHAN_SHIFT);
1019 dma[(*j)++] = paddr;
1020 paddr += words << 2;
1021 }
1022 if (size) {
1023 DPRINTK("put_dma: %lx DMA: %d bytes\n",(unsigned long) paddr,
1024 size);
1025 dma[(*j)++] = MID_DT_BYTE | (size << MID_DMA_COUNT_SHIFT) |
1026 (chan << MID_DMA_CHAN_SHIFT);
1027 dma[(*j)++] = paddr;
1028 }
1029}
1030
1031
1032static enum enq_res do_tx(struct sk_buff *skb)
1033{
1034 struct atm_vcc *vcc;
1035 struct eni_dev *eni_dev;
1036 struct eni_vcc *eni_vcc;
1037 struct eni_tx *tx;
1038 dma_addr_t paddr;
1039 u32 dma_rd,dma_wr;
1040 u32 size; /* in words */
1041 int aal5,dma_size,i,j;
1042
1043 DPRINTK(">do_tx\n");
1044 NULLCHECK(skb);
1045 EVENT("do_tx: skb=0x%lx, %ld bytes\n",(unsigned long) skb,skb->len);
1046 vcc = ATM_SKB(skb)->vcc;
1047 NULLCHECK(vcc);
1048 eni_dev = ENI_DEV(vcc->dev);
1049 NULLCHECK(eni_dev);
1050 eni_vcc = ENI_VCC(vcc);
1051 tx = eni_vcc->tx;
1052 NULLCHECK(tx);
1053#if 0 /* Enable this for testing with the "align" program */
1054 {
1055 unsigned int hack = *((char *) skb->data)-'0';
1056
1057 if (hack < 8) {
1058 skb->data += hack;
1059 skb->len -= hack;
1060 }
1061 }
1062#endif
1063#if 0 /* should work now */
1064 if ((unsigned long) skb->data & 3)
1065 printk(KERN_ERR DEV_LABEL "(itf %d): VCI %d has mis-aligned "
1066 "TX data\n",vcc->dev->number,vcc->vci);
1067#endif
1068 /*
1069 * Potential future IP speedup: make hard_header big enough to put
1070 * segmentation descriptor directly into PDU. Saves: 4 slave writes,
1071 * 1 DMA xfer & 2 DMA'ed bytes (protocol layering is for wimps :-)
1072 */
1073
1074 aal5 = vcc->qos.aal == ATM_AAL5;
1075 /* check space in buffer */
1076 if (!aal5)
1077 size = (ATM_CELL_PAYLOAD >> 2)+TX_DESCR_SIZE;
1078 /* cell without HEC plus segmentation header (includes
1079 four-byte cell header) */
1080 else {
1081 size = skb->len+4*AAL5_TRAILER+ATM_CELL_PAYLOAD-1;
1082 /* add AAL5 trailer */
1083 size = ((size-(size % ATM_CELL_PAYLOAD)) >> 2)+TX_DESCR_SIZE;
1084 /* add segmentation header */
1085 }
1086 /*
1087 * Can I move tx_pos by size bytes without getting closer than TX_GAP
1088 * to the read pointer ? TX_GAP means to leave some space for what
1089 * the manual calls "too close".
1090 */
1091 if (!NEPMOK(tx->tx_pos,size+TX_GAP,
1092 eni_in(MID_TX_RDPTR(tx->index)),tx->words)) {
1093 DPRINTK(DEV_LABEL "(itf %d): TX full (size %d)\n",
1094 vcc->dev->number,size);
1095 return enq_next;
1096 }
1097 /* check DMA */
1098 dma_wr = eni_in(MID_DMA_WR_TX);
1099 dma_rd = eni_in(MID_DMA_RD_TX);
1100 dma_size = 3; /* JK for descriptor and final fill, plus final size
1101 mis-alignment fix */
1102DPRINTK("iovcnt = %d\n",skb_shinfo(skb)->nr_frags);
1103 if (!skb_shinfo(skb)->nr_frags) dma_size += 5;
1104 else dma_size += 5*(skb_shinfo(skb)->nr_frags+1);
1105 if (dma_size > TX_DMA_BUF) {
1106 printk(KERN_CRIT DEV_LABEL "(itf %d): needs %d DMA entries "
1107 "(got only %d)\n",vcc->dev->number,dma_size,TX_DMA_BUF);
1108 }
1109 DPRINTK("dma_wr is %d, tx_pos is %ld\n",dma_wr,tx->tx_pos);
1110 if (dma_wr != dma_rd && ((dma_rd+NR_DMA_TX-dma_wr) & (NR_DMA_TX-1)) <
1111 dma_size) {
1112 printk(KERN_WARNING DEV_LABEL "(itf %d): TX DMA full\n",
1113 vcc->dev->number);
1114 return enq_jam;
1115 }
1116 paddr = pci_map_single(eni_dev->pci_dev,skb->data,skb->len,
1117 PCI_DMA_TODEVICE);
1118 ENI_PRV_PADDR(skb) = paddr;
1119 /* prepare DMA queue entries */
1120 j = 0;
1121 eni_dev->dma[j++] = (((tx->tx_pos+TX_DESCR_SIZE) & (tx->words-1)) <<
1122 MID_DMA_COUNT_SHIFT) | (tx->index << MID_DMA_CHAN_SHIFT) |
1123 MID_DT_JK;
1124 j++;
1125 if (!skb_shinfo(skb)->nr_frags)
1126 if (aal5) put_dma(tx->index,eni_dev->dma,&j,paddr,skb->len);
1127 else put_dma(tx->index,eni_dev->dma,&j,paddr+4,skb->len-4);
1128 else {
1129DPRINTK("doing direct send\n"); /* @@@ well, this doesn't work anyway */
1130 for (i = -1; i < skb_shinfo(skb)->nr_frags; i++)
1131 if (i == -1)
1132 put_dma(tx->index,eni_dev->dma,&j,(unsigned long)
1133 skb->data,
1134 skb_headlen(skb));
1135 else
1136 put_dma(tx->index,eni_dev->dma,&j,(unsigned long)
1137 skb_shinfo(skb)->frags[i].page + skb_shinfo(skb)->frags[i].page_offset,
1138 skb_shinfo(skb)->frags[i].size);
1139 }
1140 if (skb->len & 3)
1141 put_dma(tx->index,eni_dev->dma,&j,zeroes,4-(skb->len & 3));
1142 /* JK for AAL5 trailer - AAL0 doesn't need it, but who cares ... */
1143 eni_dev->dma[j++] = (((tx->tx_pos+size) & (tx->words-1)) <<
1144 MID_DMA_COUNT_SHIFT) | (tx->index << MID_DMA_CHAN_SHIFT) |
1145 MID_DMA_END | MID_DT_JK;
1146 j++;
1147 DPRINTK("DMA at end: %d\n",j);
1148 /* store frame */
1149 writel((MID_SEG_TX_ID << MID_SEG_ID_SHIFT) |
1150 (aal5 ? MID_SEG_AAL5 : 0) | (tx->prescaler << MID_SEG_PR_SHIFT) |
1151 (tx->resolution << MID_SEG_RATE_SHIFT) |
1152 (size/(ATM_CELL_PAYLOAD/4)),tx->send+tx->tx_pos*4);
1153/*printk("dsc = 0x%08lx\n",(unsigned long) readl(tx->send+tx->tx_pos*4));*/
1154 writel((vcc->vci << MID_SEG_VCI_SHIFT) |
1155 (aal5 ? 0 : (skb->data[3] & 0xf)) |
1156 (ATM_SKB(skb)->atm_options & ATM_ATMOPT_CLP ? MID_SEG_CLP : 0),
1157 tx->send+((tx->tx_pos+1) & (tx->words-1))*4);
1158 DPRINTK("size: %d, len:%d\n",size,skb->len);
1159 if (aal5)
1160 writel(skb->len,tx->send+
1161 ((tx->tx_pos+size-AAL5_TRAILER) & (tx->words-1))*4);
1162 j = j >> 1;
1163 for (i = 0; i < j; i++) {
1164 writel(eni_dev->dma[i*2],eni_dev->tx_dma+dma_wr*8);
1165 writel(eni_dev->dma[i*2+1],eni_dev->tx_dma+dma_wr*8+4);
1166 dma_wr = (dma_wr+1) & (NR_DMA_TX-1);
1167 }
1168 ENI_PRV_POS(skb) = tx->tx_pos;
1169 ENI_PRV_SIZE(skb) = size;
1170 ENI_VCC(vcc)->txing += size;
1171 tx->tx_pos = (tx->tx_pos+size) & (tx->words-1);
1172 DPRINTK("dma_wr set to %d, tx_pos is now %ld\n",dma_wr,tx->tx_pos);
1173 eni_out(dma_wr,MID_DMA_WR_TX);
1174 skb_queue_tail(&eni_dev->tx_queue,skb);
1175queued++;
1176 return enq_ok;
1177}
1178
1179
1180static void poll_tx(struct atm_dev *dev)
1181{
1182 struct eni_tx *tx;
1183 struct sk_buff *skb;
1184 enum enq_res res;
1185 int i;
1186
1187 DPRINTK(">poll_tx\n");
1188 for (i = NR_CHAN-1; i >= 0; i--) {
1189 tx = &ENI_DEV(dev)->tx[i];
1190 if (tx->send)
1191 while ((skb = skb_dequeue(&tx->backlog))) {
1192 res = do_tx(skb);
1193 if (res == enq_ok) continue;
1194 DPRINTK("re-queuing TX PDU\n");
1195 skb_queue_head(&tx->backlog,skb);
1196requeued++;
1197 if (res == enq_jam) return;
1198 break;
1199 }
1200 }
1201}
1202
1203
1204static void dequeue_tx(struct atm_dev *dev)
1205{
1206 struct eni_dev *eni_dev;
1207 struct atm_vcc *vcc;
1208 struct sk_buff *skb;
1209 struct eni_tx *tx;
1210
1211 NULLCHECK(dev);
1212 eni_dev = ENI_DEV(dev);
1213 NULLCHECK(eni_dev);
1214 while ((skb = skb_dequeue(&eni_dev->tx_queue))) {
1215 vcc = ATM_SKB(skb)->vcc;
1216 NULLCHECK(vcc);
1217 tx = ENI_VCC(vcc)->tx;
1218 NULLCHECK(ENI_VCC(vcc)->tx);
1219 DPRINTK("dequeue_tx: next 0x%lx curr 0x%x\n",ENI_PRV_POS(skb),
1220 (unsigned) eni_in(MID_TX_DESCRSTART(tx->index)));
1221 if (ENI_VCC(vcc)->txing < tx->words && ENI_PRV_POS(skb) ==
1222 eni_in(MID_TX_DESCRSTART(tx->index))) {
1223 skb_queue_head(&eni_dev->tx_queue,skb);
1224 break;
1225 }
1226 ENI_VCC(vcc)->txing -= ENI_PRV_SIZE(skb);
1227 pci_unmap_single(eni_dev->pci_dev,ENI_PRV_PADDR(skb),skb->len,
1228 PCI_DMA_TODEVICE);
1229 if (vcc->pop) vcc->pop(vcc,skb);
1230 else dev_kfree_skb_irq(skb);
1231 atomic_inc(&vcc->stats->tx);
1232 wake_up(&eni_dev->tx_wait);
1233dma_complete++;
1234 }
1235}
1236
1237
1238static struct eni_tx *alloc_tx(struct eni_dev *eni_dev,int ubr)
1239{
1240 int i;
1241
1242 for (i = !ubr; i < NR_CHAN; i++)
1243 if (!eni_dev->tx[i].send) return eni_dev->tx+i;
1244 return NULL;
1245}
1246
1247
1248static int comp_tx(struct eni_dev *eni_dev,int *pcr,int reserved,int *pre,
1249 int *res,int unlimited)
1250{
1251 static const int pre_div[] = { 4,16,128,2048 };
1252 /* 2^(((x+2)^2-(x+2))/2+1) */
1253
1254 if (unlimited) *pre = *res = 0;
1255 else {
1256 if (*pcr > 0) {
1257 int div;
1258
1259 for (*pre = 0; *pre < 3; (*pre)++)
1260 if (TS_CLOCK/pre_div[*pre]/64 <= *pcr) break;
1261 div = pre_div[*pre]**pcr;
1262 DPRINTK("min div %d\n",div);
1263 *res = TS_CLOCK/div-1;
1264 }
1265 else {
1266 int div;
1267
1268 if (!*pcr) *pcr = eni_dev->tx_bw+reserved;
1269 for (*pre = 3; *pre >= 0; (*pre)--)
1270 if (TS_CLOCK/pre_div[*pre]/64 > -*pcr) break;
1271 if (*pre < 3) (*pre)++; /* else fail later */
1272 div = pre_div[*pre]*-*pcr;
1273 DPRINTK("max div %d\n",div);
1274 *res = DIV_ROUND_UP(TS_CLOCK, div)-1;
1275 }
1276 if (*res < 0) *res = 0;
1277 if (*res > MID_SEG_MAX_RATE) *res = MID_SEG_MAX_RATE;
1278 }
1279 *pcr = TS_CLOCK/pre_div[*pre]/(*res+1);
1280 DPRINTK("out pcr: %d (%d:%d)\n",*pcr,*pre,*res);
1281 return 0;
1282}
1283
1284
1285static int reserve_or_set_tx(struct atm_vcc *vcc,struct atm_trafprm *txtp,
1286 int set_rsv,int set_shp)
1287{
1288 struct eni_dev *eni_dev = ENI_DEV(vcc->dev);
1289 struct eni_vcc *eni_vcc = ENI_VCC(vcc);
1290 struct eni_tx *tx;
1291 unsigned long size;
1292 void __iomem *mem;
1293 int rate,ubr,unlimited,new_tx;
1294 int pre,res,order;
1295 int error;
1296
1297 rate = atm_pcr_goal(txtp);
1298 ubr = txtp->traffic_class == ATM_UBR;
1299 unlimited = ubr && (!rate || rate <= -ATM_OC3_PCR ||
1300 rate >= ATM_OC3_PCR);
1301 if (!unlimited) {
1302 size = txtp->max_sdu*eni_dev->tx_mult/100;
1303 if (size > MID_MAX_BUF_SIZE && txtp->max_sdu <=
1304 MID_MAX_BUF_SIZE)
1305 size = MID_MAX_BUF_SIZE;
1306 }
1307 else {
1308 if (eni_dev->ubr) {
1309 eni_vcc->tx = eni_dev->ubr;
1310 txtp->pcr = ATM_OC3_PCR;
1311 return 0;
1312 }
1313 size = UBR_BUFFER;
1314 }
1315 new_tx = !eni_vcc->tx;
1316 mem = NULL; /* for gcc */
1317 if (!new_tx) tx = eni_vcc->tx;
1318 else {
1319 mem = eni_alloc_mem(eni_dev,&size);
1320 if (!mem) return -ENOBUFS;
1321 tx = alloc_tx(eni_dev,unlimited);
1322 if (!tx) {
1323 eni_free_mem(eni_dev,mem,size);
1324 return -EBUSY;
1325 }
1326 DPRINTK("got chan %d\n",tx->index);
1327 tx->reserved = tx->shaping = 0;
1328 tx->send = mem;
1329 tx->words = size >> 2;
1330 skb_queue_head_init(&tx->backlog);
1331 for (order = 0; size > (1 << (order+10)); order++);
1332 eni_out((order << MID_SIZE_SHIFT) |
1333 ((tx->send-eni_dev->ram) >> (MID_LOC_SKIP+2)),
1334 MID_TX_PLACE(tx->index));
1335 tx->tx_pos = eni_in(MID_TX_DESCRSTART(tx->index)) &
1336 MID_DESCR_START;
1337 }
1338 error = comp_tx(eni_dev,&rate,tx->reserved,&pre,&res,unlimited);
1339 if (!error && txtp->min_pcr > rate) error = -EINVAL;
1340 if (!error && txtp->max_pcr && txtp->max_pcr != ATM_MAX_PCR &&
1341 txtp->max_pcr < rate) error = -EINVAL;
1342 if (!error && !ubr && rate > eni_dev->tx_bw+tx->reserved)
1343 error = -EINVAL;
1344 if (!error && set_rsv && !set_shp && rate < tx->shaping)
1345 error = -EINVAL;
1346 if (!error && !set_rsv && rate > tx->reserved && !ubr)
1347 error = -EINVAL;
1348 if (error) {
1349 if (new_tx) {
1350 tx->send = NULL;
1351 eni_free_mem(eni_dev,mem,size);
1352 }
1353 return error;
1354 }
1355 txtp->pcr = rate;
1356 if (set_rsv && !ubr) {
1357 eni_dev->tx_bw += tx->reserved;
1358 tx->reserved = rate;
1359 eni_dev->tx_bw -= rate;
1360 }
1361 if (set_shp || (unlimited && new_tx)) {
1362 if (unlimited && new_tx) eni_dev->ubr = tx;
1363 tx->prescaler = pre;
1364 tx->resolution = res;
1365 tx->shaping = rate;
1366 }
1367 if (set_shp) eni_vcc->tx = tx;
1368 DPRINTK("rsv %d shp %d\n",tx->reserved,tx->shaping);
1369 return 0;
1370}
1371
1372
1373static int open_tx_first(struct atm_vcc *vcc)
1374{
1375 ENI_VCC(vcc)->tx = NULL;
1376 if (vcc->qos.txtp.traffic_class == ATM_NONE) return 0;
1377 ENI_VCC(vcc)->txing = 0;
1378 return reserve_or_set_tx(vcc,&vcc->qos.txtp,1,1);
1379}
1380
1381
1382static int open_tx_second(struct atm_vcc *vcc)
1383{
1384 return 0; /* nothing to do */
1385}
1386
1387
1388static void close_tx(struct atm_vcc *vcc)
1389{
1390 DECLARE_WAITQUEUE(wait,current);
1391 struct eni_dev *eni_dev;
1392 struct eni_vcc *eni_vcc;
1393
1394 eni_vcc = ENI_VCC(vcc);
1395 if (!eni_vcc->tx) return;
1396 eni_dev = ENI_DEV(vcc->dev);
1397 /* wait for TX queue to drain */
1398 DPRINTK("eni_close: waiting for TX ...\n");
1399 add_wait_queue(&eni_dev->tx_wait,&wait);
1400 set_current_state(TASK_UNINTERRUPTIBLE);
1401 for (;;) {
1402 int txing;
1403
1404 tasklet_disable(&eni_dev->task);
1405 txing = skb_peek(&eni_vcc->tx->backlog) || eni_vcc->txing;
1406 tasklet_enable(&eni_dev->task);
1407 if (!txing) break;
1408 DPRINTK("%d TX left\n",eni_vcc->txing);
1409 schedule();
1410 set_current_state(TASK_UNINTERRUPTIBLE);
1411 }
1412 set_current_state(TASK_RUNNING);
1413 remove_wait_queue(&eni_dev->tx_wait,&wait);
1414 if (eni_vcc->tx != eni_dev->ubr) {
1415 /*
1416 * Looping a few times in here is probably far cheaper than
1417 * keeping track of TX completions all the time, so let's poll
1418 * a bit ...
1419 */
1420 while (eni_in(MID_TX_RDPTR(eni_vcc->tx->index)) !=
1421 eni_in(MID_TX_DESCRSTART(eni_vcc->tx->index)))
1422 schedule();
1423 eni_free_mem(eni_dev,eni_vcc->tx->send,eni_vcc->tx->words << 2);
1424 eni_vcc->tx->send = NULL;
1425 eni_dev->tx_bw += eni_vcc->tx->reserved;
1426 }
1427 eni_vcc->tx = NULL;
1428}
1429
1430
1431static int start_tx(struct atm_dev *dev)
1432{
1433 struct eni_dev *eni_dev;
1434 int i;
1435
1436 eni_dev = ENI_DEV(dev);
1437 eni_dev->lost = 0;
1438 eni_dev->tx_bw = ATM_OC3_PCR;
1439 eni_dev->tx_mult = DEFAULT_TX_MULT;
1440 init_waitqueue_head(&eni_dev->tx_wait);
1441 eni_dev->ubr = NULL;
1442 skb_queue_head_init(&eni_dev->tx_queue);
1443 eni_out(0,MID_DMA_WR_TX);
1444 for (i = 0; i < NR_CHAN; i++) {
1445 eni_dev->tx[i].send = NULL;
1446 eni_dev->tx[i].index = i;
1447 }
1448 return 0;
1449}
1450
1451
1452/*--------------------------------- common ----------------------------------*/
1453
1454
1455#if 0 /* may become useful again when tuning things */
1456
1457static void foo(void)
1458{
1459printk(KERN_INFO
1460 "tx_complete=%d,dma_complete=%d,queued=%d,requeued=%d,sub=%d,\n"
1461 "backlogged=%d,rx_enqueued=%d,rx_dequeued=%d,putting=%d,pushed=%d\n",
1462 tx_complete,dma_complete,queued,requeued,submitted,backlogged,
1463 rx_enqueued,rx_dequeued,putting,pushed);
1464if (eni_boards) printk(KERN_INFO "loss: %ld\n",ENI_DEV(eni_boards)->lost);
1465}
1466
1467#endif
1468
1469
1470static void bug_int(struct atm_dev *dev,unsigned long reason)
1471{
1472 DPRINTK(">bug_int\n");
1473 if (reason & MID_DMA_ERR_ACK)
1474 printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - DMA "
1475 "error\n",dev->number);
1476 if (reason & MID_TX_IDENT_MISM)
1477 printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - ident "
1478 "mismatch\n",dev->number);
1479 if (reason & MID_TX_DMA_OVFL)
1480 printk(KERN_CRIT DEV_LABEL "(itf %d): driver error - DMA "
1481 "overflow\n",dev->number);
1482 EVENT("---dump ends here---\n",0,0);
1483 printk(KERN_NOTICE "---recent events---\n");
1484 event_dump();
1485}
1486
1487
1488static irqreturn_t eni_int(int irq,void *dev_id)
1489{
1490 struct atm_dev *dev;
1491 struct eni_dev *eni_dev;
1492 u32 reason;
1493
1494 DPRINTK(">eni_int\n");
1495 dev = dev_id;
1496 eni_dev = ENI_DEV(dev);
1497 reason = eni_in(MID_ISA);
1498 DPRINTK(DEV_LABEL ": int 0x%lx\n",(unsigned long) reason);
1499 /*
1500 * Must handle these two right now, because reading ISA doesn't clear
1501 * them, so they re-occur and we never make it to the tasklet. Since
1502 * they're rare, we don't mind the occasional invocation of eni_tasklet
1503 * with eni_dev->events == 0.
1504 */
1505 if (reason & MID_STAT_OVFL) {
1506 EVENT("stat overflow\n",0,0);
1507 eni_dev->lost += eni_in(MID_STAT) & MID_OVFL_TRASH;
1508 }
1509 if (reason & MID_SUNI_INT) {
1510 EVENT("SUNI int\n",0,0);
1511 dev->phy->interrupt(dev);
1512#if 0
1513 foo();
1514#endif
1515 }
1516 spin_lock(&eni_dev->lock);
1517 eni_dev->events |= reason;
1518 spin_unlock(&eni_dev->lock);
1519 tasklet_schedule(&eni_dev->task);
1520 return IRQ_HANDLED;
1521}
1522
1523
1524static void eni_tasklet(unsigned long data)
1525{
1526 struct atm_dev *dev = (struct atm_dev *) data;
1527 struct eni_dev *eni_dev = ENI_DEV(dev);
1528 unsigned long flags;
1529 u32 events;
1530
1531 DPRINTK("eni_tasklet (dev %p)\n",dev);
1532 spin_lock_irqsave(&eni_dev->lock,flags);
1533 events = xchg(&eni_dev->events,0);
1534 spin_unlock_irqrestore(&eni_dev->lock,flags);
1535 if (events & MID_RX_DMA_COMPLETE) {
1536 EVENT("INT: RX DMA complete, starting dequeue_rx\n",0,0);
1537 dequeue_rx(dev);
1538 EVENT("dequeue_rx done, starting poll_rx\n",0,0);
1539 poll_rx(dev);
1540 EVENT("poll_rx done\n",0,0);
1541 /* poll_tx ? */
1542 }
1543 if (events & MID_SERVICE) {
1544 EVENT("INT: service, starting get_service\n",0,0);
1545 get_service(dev);
1546 EVENT("get_service done, starting poll_rx\n",0,0);
1547 poll_rx(dev);
1548 EVENT("poll_rx done\n",0,0);
1549 }
1550 if (events & MID_TX_DMA_COMPLETE) {
1551 EVENT("INT: TX DMA COMPLETE\n",0,0);
1552 dequeue_tx(dev);
1553 }
1554 if (events & MID_TX_COMPLETE) {
1555 EVENT("INT: TX COMPLETE\n",0,0);
1556tx_complete++;
1557 wake_up(&eni_dev->tx_wait);
1558 /* poll_rx ? */
1559 }
1560 if (events & (MID_DMA_ERR_ACK | MID_TX_IDENT_MISM | MID_TX_DMA_OVFL)) {
1561 EVENT("bug interrupt\n",0,0);
1562 bug_int(dev,events);
1563 }
1564 poll_tx(dev);
1565}
1566
1567
1568/*--------------------------------- entries ---------------------------------*/
1569
1570
1571static const char *media_name[] __devinitdata = {
1572 "MMF", "SMF", "MMF", "03?", /* 0- 3 */
1573 "UTP", "05?", "06?", "07?", /* 4- 7 */
1574 "TAXI","09?", "10?", "11?", /* 8-11 */
1575 "12?", "13?", "14?", "15?", /* 12-15 */
1576 "MMF", "SMF", "18?", "19?", /* 16-19 */
1577 "UTP", "21?", "22?", "23?", /* 20-23 */
1578 "24?", "25?", "26?", "27?", /* 24-27 */
1579 "28?", "29?", "30?", "31?" /* 28-31 */
1580};
1581
1582
1583#define SET_SEPROM \
1584 ({ if (!error && !pci_error) { \
1585 pci_error = pci_write_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,tonga); \
1586 udelay(10); /* 10 usecs */ \
1587 } })
1588#define GET_SEPROM \
1589 ({ if (!error && !pci_error) { \
1590 pci_error = pci_read_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,&tonga); \
1591 udelay(10); /* 10 usecs */ \
1592 } })
1593
1594
1595static int __devinit get_esi_asic(struct atm_dev *dev)
1596{
1597 struct eni_dev *eni_dev;
1598 unsigned char tonga;
1599 int error,failed,pci_error;
1600 int address,i,j;
1601
1602 eni_dev = ENI_DEV(dev);
1603 error = pci_error = 0;
1604 tonga = SEPROM_MAGIC | SEPROM_DATA | SEPROM_CLK;
1605 SET_SEPROM;
1606 for (i = 0; i < ESI_LEN && !error && !pci_error; i++) {
1607 /* start operation */
1608 tonga |= SEPROM_DATA;
1609 SET_SEPROM;
1610 tonga |= SEPROM_CLK;
1611 SET_SEPROM;
1612 tonga &= ~SEPROM_DATA;
1613 SET_SEPROM;
1614 tonga &= ~SEPROM_CLK;
1615 SET_SEPROM;
1616 /* send address */
1617 address = ((i+SEPROM_ESI_BASE) << 1)+1;
1618 for (j = 7; j >= 0; j--) {
1619 tonga = (address >> j) & 1 ? tonga | SEPROM_DATA :
1620 tonga & ~SEPROM_DATA;
1621 SET_SEPROM;
1622 tonga |= SEPROM_CLK;
1623 SET_SEPROM;
1624 tonga &= ~SEPROM_CLK;
1625 SET_SEPROM;
1626 }
1627 /* get ack */
1628 tonga |= SEPROM_DATA;
1629 SET_SEPROM;
1630 tonga |= SEPROM_CLK;
1631 SET_SEPROM;
1632 GET_SEPROM;
1633 failed = tonga & SEPROM_DATA;
1634 tonga &= ~SEPROM_CLK;
1635 SET_SEPROM;
1636 tonga |= SEPROM_DATA;
1637 SET_SEPROM;
1638 if (failed) error = -EIO;
1639 else {
1640 dev->esi[i] = 0;
1641 for (j = 7; j >= 0; j--) {
1642 dev->esi[i] <<= 1;
1643 tonga |= SEPROM_DATA;
1644 SET_SEPROM;
1645 tonga |= SEPROM_CLK;
1646 SET_SEPROM;
1647 GET_SEPROM;
1648 if (tonga & SEPROM_DATA) dev->esi[i] |= 1;
1649 tonga &= ~SEPROM_CLK;
1650 SET_SEPROM;
1651 tonga |= SEPROM_DATA;
1652 SET_SEPROM;
1653 }
1654 /* get ack */
1655 tonga |= SEPROM_DATA;
1656 SET_SEPROM;
1657 tonga |= SEPROM_CLK;
1658 SET_SEPROM;
1659 GET_SEPROM;
1660 if (!(tonga & SEPROM_DATA)) error = -EIO;
1661 tonga &= ~SEPROM_CLK;
1662 SET_SEPROM;
1663 tonga |= SEPROM_DATA;
1664 SET_SEPROM;
1665 }
1666 /* stop operation */
1667 tonga &= ~SEPROM_DATA;
1668 SET_SEPROM;
1669 tonga |= SEPROM_CLK;
1670 SET_SEPROM;
1671 tonga |= SEPROM_DATA;
1672 SET_SEPROM;
1673 }
1674 if (pci_error) {
1675 printk(KERN_ERR DEV_LABEL "(itf %d): error reading ESI "
1676 "(0x%02x)\n",dev->number,pci_error);
1677 error = -EIO;
1678 }
1679 return error;
1680}
1681
1682
1683#undef SET_SEPROM
1684#undef GET_SEPROM
1685
1686
1687static int __devinit get_esi_fpga(struct atm_dev *dev, void __iomem *base)
1688{
1689 void __iomem *mac_base;
1690 int i;
1691
1692 mac_base = base+EPROM_SIZE-sizeof(struct midway_eprom);
1693 for (i = 0; i < ESI_LEN; i++) dev->esi[i] = readb(mac_base+(i^3));
1694 return 0;
1695}
1696
1697
1698static int __devinit eni_do_init(struct atm_dev *dev)
1699{
1700 struct midway_eprom __iomem *eprom;
1701 struct eni_dev *eni_dev;
1702 struct pci_dev *pci_dev;
1703 unsigned long real_base;
1704 void __iomem *base;
1705 int error,i,last;
1706
1707 DPRINTK(">eni_init\n");
1708 dev->ci_range.vpi_bits = 0;
1709 dev->ci_range.vci_bits = NR_VCI_LD;
1710 dev->link_rate = ATM_OC3_PCR;
1711 eni_dev = ENI_DEV(dev);
1712 pci_dev = eni_dev->pci_dev;
1713 real_base = pci_resource_start(pci_dev, 0);
1714 eni_dev->irq = pci_dev->irq;
1715 if ((error = pci_write_config_word(pci_dev,PCI_COMMAND,
1716 PCI_COMMAND_MEMORY |
1717 (eni_dev->asic ? PCI_COMMAND_PARITY | PCI_COMMAND_SERR : 0)))) {
1718 printk(KERN_ERR DEV_LABEL "(itf %d): can't enable memory "
1719 "(0x%02x)\n",dev->number,error);
1720 return -EIO;
1721 }
1722 printk(KERN_NOTICE DEV_LABEL "(itf %d): rev.%d,base=0x%lx,irq=%d,",
1723 dev->number,pci_dev->revision,real_base,eni_dev->irq);
1724 if (!(base = ioremap_nocache(real_base,MAP_MAX_SIZE))) {
1725 printk("\n");
1726 printk(KERN_ERR DEV_LABEL "(itf %d): can't set up page "
1727 "mapping\n",dev->number);
1728 return error;
1729 }
1730 eni_dev->base_diff = real_base - (unsigned long) base;
1731 /* id may not be present in ASIC Tonga boards - check this @@@ */
1732 if (!eni_dev->asic) {
1733 eprom = (base+EPROM_SIZE-sizeof(struct midway_eprom));
1734 if (readl(&eprom->magic) != ENI155_MAGIC) {
1735 printk("\n");
1736 printk(KERN_ERR DEV_LABEL
1737 "(itf %d): bad magic - expected 0x%x, got 0x%x\n",
1738 dev->number, ENI155_MAGIC,
1739 (unsigned)readl(&eprom->magic));
1740 error = -EINVAL;
1741 goto unmap;
1742 }
1743 }
1744 eni_dev->phy = base+PHY_BASE;
1745 eni_dev->reg = base+REG_BASE;
1746 eni_dev->ram = base+RAM_BASE;
1747 last = MAP_MAX_SIZE-RAM_BASE;
1748 for (i = last-RAM_INCREMENT; i >= 0; i -= RAM_INCREMENT) {
1749 writel(0x55555555,eni_dev->ram+i);
1750 if (readl(eni_dev->ram+i) != 0x55555555) last = i;
1751 else {
1752 writel(0xAAAAAAAA,eni_dev->ram+i);
1753 if (readl(eni_dev->ram+i) != 0xAAAAAAAA) last = i;
1754 else writel(i,eni_dev->ram+i);
1755 }
1756 }
1757 for (i = 0; i < last; i += RAM_INCREMENT)
1758 if (readl(eni_dev->ram+i) != i) break;
1759 eni_dev->mem = i;
1760 memset_io(eni_dev->ram,0,eni_dev->mem);
1761 /* TODO: should shrink allocation now */
1762 printk("mem=%dkB (",eni_dev->mem >> 10);
1763 /* TODO: check for non-SUNI, check for TAXI ? */
1764 if (!(eni_in(MID_RES_ID_MCON) & 0x200) != !eni_dev->asic) {
1765 printk(")\n");
1766 printk(KERN_ERR DEV_LABEL "(itf %d): ERROR - wrong id 0x%x\n",
1767 dev->number,(unsigned) eni_in(MID_RES_ID_MCON));
1768 error = -EINVAL;
1769 goto unmap;
1770 }
1771 error = eni_dev->asic ? get_esi_asic(dev) : get_esi_fpga(dev,base);
1772 if (error)
1773 goto unmap;
1774 for (i = 0; i < ESI_LEN; i++)
1775 printk("%s%02X",i ? "-" : "",dev->esi[i]);
1776 printk(")\n");
1777 printk(KERN_NOTICE DEV_LABEL "(itf %d): %s,%s\n",dev->number,
1778 eni_in(MID_RES_ID_MCON) & 0x200 ? "ASIC" : "FPGA",
1779 media_name[eni_in(MID_RES_ID_MCON) & DAUGTHER_ID]);
1780
1781 error = suni_init(dev);
1782 if (error)
1783 goto unmap;
1784out:
1785 return error;
1786unmap:
1787 iounmap(base);
1788 goto out;
1789}
1790
1791
1792static int __devinit eni_start(struct atm_dev *dev)
1793{
1794 struct eni_dev *eni_dev;
1795
1796 void __iomem *buf;
1797 unsigned long buffer_mem;
1798 int error;
1799
1800 DPRINTK(">eni_start\n");
1801 eni_dev = ENI_DEV(dev);
1802 if (request_irq(eni_dev->irq,&eni_int,IRQF_SHARED,DEV_LABEL,dev)) {
1803 printk(KERN_ERR DEV_LABEL "(itf %d): IRQ%d is already in use\n",
1804 dev->number,eni_dev->irq);
1805 error = -EAGAIN;
1806 goto out;
1807 }
1808 pci_set_master(eni_dev->pci_dev);
1809 if ((error = pci_write_config_word(eni_dev->pci_dev,PCI_COMMAND,
1810 PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
1811 (eni_dev->asic ? PCI_COMMAND_PARITY | PCI_COMMAND_SERR : 0)))) {
1812 printk(KERN_ERR DEV_LABEL "(itf %d): can't enable memory+"
1813 "master (0x%02x)\n",dev->number,error);
1814 goto free_irq;
1815 }
1816 if ((error = pci_write_config_byte(eni_dev->pci_dev,PCI_TONGA_CTRL,
1817 END_SWAP_DMA))) {
1818 printk(KERN_ERR DEV_LABEL "(itf %d): can't set endian swap "
1819 "(0x%02x)\n",dev->number,error);
1820 goto free_irq;
1821 }
1822 /* determine addresses of internal tables */
1823 eni_dev->vci = eni_dev->ram;
1824 eni_dev->rx_dma = eni_dev->ram+NR_VCI*16;
1825 eni_dev->tx_dma = eni_dev->rx_dma+NR_DMA_RX*8;
1826 eni_dev->service = eni_dev->tx_dma+NR_DMA_TX*8;
1827 buf = eni_dev->service+NR_SERVICE*4;
1828 DPRINTK("vci 0x%lx,rx 0x%lx, tx 0x%lx,srv 0x%lx,buf 0x%lx\n",
1829 eni_dev->vci,eni_dev->rx_dma,eni_dev->tx_dma,
1830 eni_dev->service,buf);
1831 spin_lock_init(&eni_dev->lock);
1832 tasklet_init(&eni_dev->task,eni_tasklet,(unsigned long) dev);
1833 eni_dev->events = 0;
1834 /* initialize memory management */
1835 buffer_mem = eni_dev->mem - (buf - eni_dev->ram);
1836 eni_dev->free_list_size = buffer_mem/MID_MIN_BUF_SIZE/2;
1837 eni_dev->free_list = kmalloc(
1838 sizeof(struct eni_free)*(eni_dev->free_list_size+1),GFP_KERNEL);
1839 if (!eni_dev->free_list) {
1840 printk(KERN_ERR DEV_LABEL "(itf %d): couldn't get free page\n",
1841 dev->number);
1842 error = -ENOMEM;
1843 goto free_irq;
1844 }
1845 eni_dev->free_len = 0;
1846 eni_put_free(eni_dev,buf,buffer_mem);
1847 memset_io(eni_dev->vci,0,16*NR_VCI); /* clear VCI table */
1848 /*
1849 * byte_addr free (k)
1850 * 0x00000000 512 VCI table
1851 * 0x00004000 496 RX DMA
1852 * 0x00005000 492 TX DMA
1853 * 0x00006000 488 service list
1854 * 0x00007000 484 buffers
1855 * 0x00080000 0 end (512kB)
1856 */
1857 eni_out(0xffffffff,MID_IE);
1858 error = start_tx(dev);
1859 if (error) goto free_list;
1860 error = start_rx(dev);
1861 if (error) goto free_list;
1862 error = dev->phy->start(dev);
1863 if (error) goto free_list;
1864 eni_out(eni_in(MID_MC_S) | (1 << MID_INT_SEL_SHIFT) |
1865 MID_TX_LOCK_MODE | MID_DMA_ENABLE | MID_TX_ENABLE | MID_RX_ENABLE,
1866 MID_MC_S);
1867 /* Tonga uses SBus INTReq1 */
1868 (void) eni_in(MID_ISA); /* clear Midway interrupts */
1869 return 0;
1870
1871free_list:
1872 kfree(eni_dev->free_list);
1873
1874free_irq:
1875 free_irq(eni_dev->irq, eni_dev);
1876
1877out:
1878 return error;
1879}
1880
1881
1882static void eni_close(struct atm_vcc *vcc)
1883{
1884 DPRINTK(">eni_close\n");
1885 if (!ENI_VCC(vcc)) return;
1886 clear_bit(ATM_VF_READY,&vcc->flags);
1887 close_rx(vcc);
1888 close_tx(vcc);
1889 DPRINTK("eni_close: done waiting\n");
1890 /* deallocate memory */
1891 kfree(ENI_VCC(vcc));
1892 vcc->dev_data = NULL;
1893 clear_bit(ATM_VF_ADDR,&vcc->flags);
1894 /*foo();*/
1895}
1896
1897
1898static int eni_open(struct atm_vcc *vcc)
1899{
1900 struct eni_vcc *eni_vcc;
1901 int error;
1902 short vpi = vcc->vpi;
1903 int vci = vcc->vci;
1904
1905 DPRINTK(">eni_open\n");
1906 EVENT("eni_open\n",0,0);
1907 if (!test_bit(ATM_VF_PARTIAL,&vcc->flags))
1908 vcc->dev_data = NULL;
1909 if (vci != ATM_VPI_UNSPEC && vpi != ATM_VCI_UNSPEC)
1910 set_bit(ATM_VF_ADDR,&vcc->flags);
1911 if (vcc->qos.aal != ATM_AAL0 && vcc->qos.aal != ATM_AAL5)
1912 return -EINVAL;
1913 DPRINTK(DEV_LABEL "(itf %d): open %d.%d\n",vcc->dev->number,vcc->vpi,
1914 vcc->vci);
1915 if (!test_bit(ATM_VF_PARTIAL,&vcc->flags)) {
1916 eni_vcc = kmalloc(sizeof(struct eni_vcc),GFP_KERNEL);
1917 if (!eni_vcc) return -ENOMEM;
1918 vcc->dev_data = eni_vcc;
1919 eni_vcc->tx = NULL; /* for eni_close after open_rx */
1920 if ((error = open_rx_first(vcc))) {
1921 eni_close(vcc);
1922 return error;
1923 }
1924 if ((error = open_tx_first(vcc))) {
1925 eni_close(vcc);
1926 return error;
1927 }
1928 }
1929 if (vci == ATM_VPI_UNSPEC || vpi == ATM_VCI_UNSPEC) return 0;
1930 if ((error = open_rx_second(vcc))) {
1931 eni_close(vcc);
1932 return error;
1933 }
1934 if ((error = open_tx_second(vcc))) {
1935 eni_close(vcc);
1936 return error;
1937 }
1938 set_bit(ATM_VF_READY,&vcc->flags);
1939 /* should power down SUNI while !ref_count @@@ */
1940 return 0;
1941}
1942
1943
1944static int eni_change_qos(struct atm_vcc *vcc,struct atm_qos *qos,int flgs)
1945{
1946 struct eni_dev *eni_dev = ENI_DEV(vcc->dev);
1947 struct eni_tx *tx = ENI_VCC(vcc)->tx;
1948 struct sk_buff *skb;
1949 int error,rate,rsv,shp;
1950
1951 if (qos->txtp.traffic_class == ATM_NONE) return 0;
1952 if (tx == eni_dev->ubr) return -EBADFD;
1953 rate = atm_pcr_goal(&qos->txtp);
1954 if (rate < 0) rate = -rate;
1955 rsv = shp = 0;
1956 if ((flgs & ATM_MF_DEC_RSV) && rate && rate < tx->reserved) rsv = 1;
1957 if ((flgs & ATM_MF_INC_RSV) && (!rate || rate > tx->reserved)) rsv = 1;
1958 if ((flgs & ATM_MF_DEC_SHP) && rate && rate < tx->shaping) shp = 1;
1959 if ((flgs & ATM_MF_INC_SHP) && (!rate || rate > tx->shaping)) shp = 1;
1960 if (!rsv && !shp) return 0;
1961 error = reserve_or_set_tx(vcc,&qos->txtp,rsv,shp);
1962 if (error) return error;
1963 if (shp && !(flgs & ATM_MF_IMMED)) return 0;
1964 /*
1965 * Walk through the send buffer and patch the rate information in all
1966 * segmentation buffer descriptors of this VCC.
1967 */
1968 tasklet_disable(&eni_dev->task);
1969 skb_queue_walk(&eni_dev->tx_queue, skb) {
1970 void __iomem *dsc;
1971
1972 if (ATM_SKB(skb)->vcc != vcc) continue;
1973 dsc = tx->send+ENI_PRV_POS(skb)*4;
1974 writel((readl(dsc) & ~(MID_SEG_RATE | MID_SEG_PR)) |
1975 (tx->prescaler << MID_SEG_PR_SHIFT) |
1976 (tx->resolution << MID_SEG_RATE_SHIFT), dsc);
1977 }
1978 tasklet_enable(&eni_dev->task);
1979 return 0;
1980}
1981
1982
1983static int eni_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
1984{
1985 struct eni_dev *eni_dev = ENI_DEV(dev);
1986
1987 if (cmd == ENI_MEMDUMP) {
1988 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1989 printk(KERN_WARNING "Please use /proc/atm/" DEV_LABEL ":%d "
1990 "instead of obsolete ioctl ENI_MEMDUMP\n",dev->number);
1991 dump(dev);
1992 return 0;
1993 }
1994 if (cmd == ENI_SETMULT) {
1995 struct eni_multipliers mult;
1996
1997 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1998 if (copy_from_user(&mult, arg,
1999 sizeof(struct eni_multipliers)))
2000 return -EFAULT;
2001 if ((mult.tx && mult.tx <= 100) || (mult.rx &&mult.rx <= 100) ||
2002 mult.tx > 65536 || mult.rx > 65536)
2003 return -EINVAL;
2004 if (mult.tx) eni_dev->tx_mult = mult.tx;
2005 if (mult.rx) eni_dev->rx_mult = mult.rx;
2006 return 0;
2007 }
2008 if (cmd == ATM_SETCIRANGE) {
2009 struct atm_cirange ci;
2010
2011 if (copy_from_user(&ci, arg,sizeof(struct atm_cirange)))
2012 return -EFAULT;
2013 if ((ci.vpi_bits == 0 || ci.vpi_bits == ATM_CI_MAX) &&
2014 (ci.vci_bits == NR_VCI_LD || ci.vpi_bits == ATM_CI_MAX))
2015 return 0;
2016 return -EINVAL;
2017 }
2018 if (!dev->phy->ioctl) return -ENOIOCTLCMD;
2019 return dev->phy->ioctl(dev,cmd,arg);
2020}
2021
2022
2023static int eni_getsockopt(struct atm_vcc *vcc,int level,int optname,
2024 void __user *optval,int optlen)
2025{
2026 return -EINVAL;
2027}
2028
2029
2030static int eni_setsockopt(struct atm_vcc *vcc,int level,int optname,
2031 void __user *optval,unsigned int optlen)
2032{
2033 return -EINVAL;
2034}
2035
2036
2037static int eni_send(struct atm_vcc *vcc,struct sk_buff *skb)
2038{
2039 enum enq_res res;
2040
2041 DPRINTK(">eni_send\n");
2042 if (!ENI_VCC(vcc)->tx) {
2043 if (vcc->pop) vcc->pop(vcc,skb);
2044 else dev_kfree_skb(skb);
2045 return -EINVAL;
2046 }
2047 if (!skb) {
2048 printk(KERN_CRIT "!skb in eni_send ?\n");
2049 if (vcc->pop) vcc->pop(vcc,skb);
2050 return -EINVAL;
2051 }
2052 if (vcc->qos.aal == ATM_AAL0) {
2053 if (skb->len != ATM_CELL_SIZE-1) {
2054 if (vcc->pop) vcc->pop(vcc,skb);
2055 else dev_kfree_skb(skb);
2056 return -EINVAL;
2057 }
2058 *(u32 *) skb->data = htonl(*(u32 *) skb->data);
2059 }
2060submitted++;
2061 ATM_SKB(skb)->vcc = vcc;
2062 tasklet_disable(&ENI_DEV(vcc->dev)->task);
2063 res = do_tx(skb);
2064 tasklet_enable(&ENI_DEV(vcc->dev)->task);
2065 if (res == enq_ok) return 0;
2066 skb_queue_tail(&ENI_VCC(vcc)->tx->backlog,skb);
2067backlogged++;
2068 tasklet_schedule(&ENI_DEV(vcc->dev)->task);
2069 return 0;
2070}
2071
2072static void eni_phy_put(struct atm_dev *dev,unsigned char value,
2073 unsigned long addr)
2074{
2075 writel(value,ENI_DEV(dev)->phy+addr*4);
2076}
2077
2078
2079
2080static unsigned char eni_phy_get(struct atm_dev *dev,unsigned long addr)
2081{
2082 return readl(ENI_DEV(dev)->phy+addr*4);
2083}
2084
2085
2086static int eni_proc_read(struct atm_dev *dev,loff_t *pos,char *page)
2087{
2088 struct hlist_node *node;
2089 struct sock *s;
2090 static const char *signal[] = { "LOST","unknown","okay" };
2091 struct eni_dev *eni_dev = ENI_DEV(dev);
2092 struct atm_vcc *vcc;
2093 int left,i;
2094
2095 left = *pos;
2096 if (!left)
2097 return sprintf(page,DEV_LABEL "(itf %d) signal %s, %dkB, "
2098 "%d cps remaining\n",dev->number,signal[(int) dev->signal],
2099 eni_dev->mem >> 10,eni_dev->tx_bw);
2100 if (!--left)
2101 return sprintf(page,"%4sBursts: TX"
2102#if !defined(CONFIG_ATM_ENI_BURST_TX_16W) && \
2103 !defined(CONFIG_ATM_ENI_BURST_TX_8W) && \
2104 !defined(CONFIG_ATM_ENI_BURST_TX_4W) && \
2105 !defined(CONFIG_ATM_ENI_BURST_TX_2W)
2106 " none"
2107#endif
2108#ifdef CONFIG_ATM_ENI_BURST_TX_16W
2109 " 16W"
2110#endif
2111#ifdef CONFIG_ATM_ENI_BURST_TX_8W
2112 " 8W"
2113#endif
2114#ifdef CONFIG_ATM_ENI_BURST_TX_4W
2115 " 4W"
2116#endif
2117#ifdef CONFIG_ATM_ENI_BURST_TX_2W
2118 " 2W"
2119#endif
2120 ", RX"
2121#if !defined(CONFIG_ATM_ENI_BURST_RX_16W) && \
2122 !defined(CONFIG_ATM_ENI_BURST_RX_8W) && \
2123 !defined(CONFIG_ATM_ENI_BURST_RX_4W) && \
2124 !defined(CONFIG_ATM_ENI_BURST_RX_2W)
2125 " none"
2126#endif
2127#ifdef CONFIG_ATM_ENI_BURST_RX_16W
2128 " 16W"
2129#endif
2130#ifdef CONFIG_ATM_ENI_BURST_RX_8W
2131 " 8W"
2132#endif
2133#ifdef CONFIG_ATM_ENI_BURST_RX_4W
2134 " 4W"
2135#endif
2136#ifdef CONFIG_ATM_ENI_BURST_RX_2W
2137 " 2W"
2138#endif
2139#ifndef CONFIG_ATM_ENI_TUNE_BURST
2140 " (default)"
2141#endif
2142 "\n","");
2143 if (!--left)
2144 return sprintf(page,"%4sBuffer multipliers: tx %d%%, rx %d%%\n",
2145 "",eni_dev->tx_mult,eni_dev->rx_mult);
2146 for (i = 0; i < NR_CHAN; i++) {
2147 struct eni_tx *tx = eni_dev->tx+i;
2148
2149 if (!tx->send) continue;
2150 if (!--left) {
2151 return sprintf(page,"tx[%d]: 0x%ld-0x%ld "
2152 "(%6ld bytes), rsv %d cps, shp %d cps%s\n",i,
2153 (unsigned long) (tx->send - eni_dev->ram),
2154 tx->send-eni_dev->ram+tx->words*4-1,tx->words*4,
2155 tx->reserved,tx->shaping,
2156 tx == eni_dev->ubr ? " (UBR)" : "");
2157 }
2158 if (--left) continue;
2159 return sprintf(page,"%10sbacklog %u packets\n","",
2160 skb_queue_len(&tx->backlog));
2161 }
2162 read_lock(&vcc_sklist_lock);
2163 for(i = 0; i < VCC_HTABLE_SIZE; ++i) {
2164 struct hlist_head *head = &vcc_hash[i];
2165
2166 sk_for_each(s, node, head) {
2167 struct eni_vcc *eni_vcc;
2168 int length;
2169
2170 vcc = atm_sk(s);
2171 if (vcc->dev != dev)
2172 continue;
2173 eni_vcc = ENI_VCC(vcc);
2174 if (--left) continue;
2175 length = sprintf(page,"vcc %4d: ",vcc->vci);
2176 if (eni_vcc->rx) {
2177 length += sprintf(page+length,"0x%ld-0x%ld "
2178 "(%6ld bytes)",
2179 (unsigned long) (eni_vcc->recv - eni_dev->ram),
2180 eni_vcc->recv-eni_dev->ram+eni_vcc->words*4-1,
2181 eni_vcc->words*4);
2182 if (eni_vcc->tx) length += sprintf(page+length,", ");
2183 }
2184 if (eni_vcc->tx)
2185 length += sprintf(page+length,"tx[%d], txing %d bytes",
2186 eni_vcc->tx->index,eni_vcc->txing);
2187 page[length] = '\n';
2188 read_unlock(&vcc_sklist_lock);
2189 return length+1;
2190 }
2191 }
2192 read_unlock(&vcc_sklist_lock);
2193 for (i = 0; i < eni_dev->free_len; i++) {
2194 struct eni_free *fe = eni_dev->free_list+i;
2195 unsigned long offset;
2196
2197 if (--left) continue;
2198 offset = (unsigned long) eni_dev->ram+eni_dev->base_diff;
2199 return sprintf(page,"free %p-%p (%6d bytes)\n",
2200 fe->start-offset,fe->start-offset+(1 << fe->order)-1,
2201 1 << fe->order);
2202 }
2203 return 0;
2204}
2205
2206
2207static const struct atmdev_ops ops = {
2208 .open = eni_open,
2209 .close = eni_close,
2210 .ioctl = eni_ioctl,
2211 .getsockopt = eni_getsockopt,
2212 .setsockopt = eni_setsockopt,
2213 .send = eni_send,
2214 .phy_put = eni_phy_put,
2215 .phy_get = eni_phy_get,
2216 .change_qos = eni_change_qos,
2217 .proc_read = eni_proc_read
2218};
2219
2220
2221static int __devinit eni_init_one(struct pci_dev *pci_dev,
2222 const struct pci_device_id *ent)
2223{
2224 struct atm_dev *dev;
2225 struct eni_dev *eni_dev;
2226 int error = -ENOMEM;
2227
2228 DPRINTK("eni_init_one\n");
2229
2230 if (pci_enable_device(pci_dev)) {
2231 error = -EIO;
2232 goto out0;
2233 }
2234
2235 eni_dev = kmalloc(sizeof(struct eni_dev),GFP_KERNEL);
2236 if (!eni_dev) goto out0;
2237 if (!cpu_zeroes) {
2238 cpu_zeroes = pci_alloc_consistent(pci_dev,ENI_ZEROES_SIZE,
2239 &zeroes);
2240 if (!cpu_zeroes) goto out1;
2241 }
2242 dev = atm_dev_register(DEV_LABEL, &pci_dev->dev, &ops, -1, NULL);
2243 if (!dev) goto out2;
2244 pci_set_drvdata(pci_dev, dev);
2245 eni_dev->pci_dev = pci_dev;
2246 dev->dev_data = eni_dev;
2247 eni_dev->asic = ent->driver_data;
2248 error = eni_do_init(dev);
2249 if (error) goto out3;
2250 error = eni_start(dev);
2251 if (error) goto out3;
2252 eni_dev->more = eni_boards;
2253 eni_boards = dev;
2254 return 0;
2255out3:
2256 atm_dev_deregister(dev);
2257out2:
2258 pci_free_consistent(eni_dev->pci_dev,ENI_ZEROES_SIZE,cpu_zeroes,zeroes);
2259 cpu_zeroes = NULL;
2260out1:
2261 kfree(eni_dev);
2262out0:
2263 return error;
2264}
2265
2266
2267static struct pci_device_id eni_pci_tbl[] = {
2268 { PCI_VDEVICE(EF, PCI_DEVICE_ID_EF_ATM_FPGA), 0 /* FPGA */ },
2269 { PCI_VDEVICE(EF, PCI_DEVICE_ID_EF_ATM_ASIC), 1 /* ASIC */ },
2270 { 0, }
2271};
2272MODULE_DEVICE_TABLE(pci,eni_pci_tbl);
2273
2274
2275static void __devexit eni_remove_one(struct pci_dev *pci_dev)
2276{
2277 /* grrr */
2278}
2279
2280
2281static struct pci_driver eni_driver = {
2282 .name = DEV_LABEL,
2283 .id_table = eni_pci_tbl,
2284 .probe = eni_init_one,
2285 .remove = __devexit_p(eni_remove_one),
2286};
2287
2288
2289static int __init eni_init(void)
2290{
2291 struct sk_buff *skb; /* dummy for sizeof */
2292
2293 if (sizeof(skb->cb) < sizeof(struct eni_skb_prv)) {
2294 printk(KERN_ERR "eni_detect: skb->cb is too small (%Zd < %Zd)\n",
2295 sizeof(skb->cb),sizeof(struct eni_skb_prv));
2296 return -EIO;
2297 }
2298 return pci_register_driver(&eni_driver);
2299}
2300
2301
2302module_init(eni_init);
2303/* @@@ since exit routine not defined, this module can not be unloaded */
2304
2305MODULE_LICENSE("GPL");