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[PATCH] fix semaphore handling in __unregister_chrdev_region
[linux/fpc-iii.git] / drivers / net / declance.c
blob521c83137bf67f61e275cacdd0553cc1af9feaa2
1 /*
2 * Lance ethernet driver for the MIPS processor based
3 * DECstation family
4 *
5 *
6 * adopted from sunlance.c by Richard van den Berg
7 *
8 * Copyright (C) 2002, 2003 Maciej W. Rozycki
9 *
10 * additional sources:
11 * - PMAD-AA TURBOchannel Ethernet Module Functional Specification,
12 * Revision 1.2
13 *
14 * History:
15 *
16 * v0.001: The kernel accepts the code and it shows the hardware address.
17 *
18 * v0.002: Removed most sparc stuff, left only some module and dma stuff.
19 *
20 * v0.003: Enhanced base address calculation from proposals by
21 * Harald Koerfgen and Thomas Riemer.
22 *
23 * v0.004: lance-regs is pointing at the right addresses, added prom
24 * check. First start of address mapping and DMA.
25 *
26 * v0.005: started to play around with LANCE-DMA. This driver will not
27 * work for non IOASIC lances. HK
28 *
29 * v0.006: added pointer arrays to lance_private and setup routine for
30 * them in dec_lance_init. HK
31 *
32 * v0.007: Big shit. The LANCE seems to use a different DMA mechanism to
33 * access the init block. This looks like one (short) word at a
34 * time, but the smallest amount the IOASIC can transfer is a
35 * (long) word. So we have a 2-2 padding here. Changed
36 * lance_init_block accordingly. The 16-16 padding for the buffers
37 * seems to be correct. HK
38 *
39 * v0.008: mods to make PMAX_LANCE work. 01/09/1999 triemer
40 *
41 * v0.009: Module support fixes, multiple interfaces support, various
42 * bits. macro
43 */
44
45 #include <linux/config.h>
46 #include <linux/crc32.h>
47 #include <linux/delay.h>
48 #include <linux/errno.h>
49 #include <linux/if_ether.h>
50 #include <linux/init.h>
51 #include <linux/kernel.h>
52 #include <linux/module.h>
53 #include <linux/netdevice.h>
54 #include <linux/etherdevice.h>
55 #include <linux/spinlock.h>
56 #include <linux/stddef.h>
57 #include <linux/string.h>
58
59 #include <asm/addrspace.h>
60 #include <asm/dec/interrupts.h>
61 #include <asm/dec/ioasic.h>
62 #include <asm/dec/ioasic_addrs.h>
63 #include <asm/dec/kn01.h>
64 #include <asm/dec/machtype.h>
65 #include <asm/dec/tc.h>
66 #include <asm/system.h>
67
68 static char version[] __devinitdata =
69 "declance.c: v0.009 by Linux MIPS DECstation task force\n";
70
71 MODULE_AUTHOR("Linux MIPS DECstation task force");
72 MODULE_DESCRIPTION("DEC LANCE (DECstation onboard, PMAD-xx) driver");
73 MODULE_LICENSE("GPL");
74
75 /*
76 * card types
77 */
78 #define ASIC_LANCE 1
79 #define PMAD_LANCE 2
80 #define PMAX_LANCE 3
81
82 #ifndef CONFIG_TC
83 unsigned long system_base;
84 unsigned long dmaptr;
85 #endif
86
87 #define LE_CSR0 0
88 #define LE_CSR1 1
89 #define LE_CSR2 2
90 #define LE_CSR3 3
91
92 #define LE_MO_PROM 0x8000 /* Enable promiscuous mode */
93
94 #define LE_C0_ERR 0x8000 /* Error: set if BAB, SQE, MISS or ME is set */
95 #define LE_C0_BABL 0x4000 /* BAB: Babble: tx timeout. */
96 #define LE_C0_CERR 0x2000 /* SQE: Signal quality error */
97 #define LE_C0_MISS 0x1000 /* MISS: Missed a packet */
98 #define LE_C0_MERR 0x0800 /* ME: Memory error */
99 #define LE_C0_RINT 0x0400 /* Received interrupt */
100 #define LE_C0_TINT 0x0200 /* Transmitter Interrupt */
101 #define LE_C0_IDON 0x0100 /* IFIN: Init finished. */
102 #define LE_C0_INTR 0x0080 /* Interrupt or error */
103 #define LE_C0_INEA 0x0040 /* Interrupt enable */
104 #define LE_C0_RXON 0x0020 /* Receiver on */
105 #define LE_C0_TXON 0x0010 /* Transmitter on */
106 #define LE_C0_TDMD 0x0008 /* Transmitter demand */
107 #define LE_C0_STOP 0x0004 /* Stop the card */
108 #define LE_C0_STRT 0x0002 /* Start the card */
109 #define LE_C0_INIT 0x0001 /* Init the card */
110
111 #define LE_C3_BSWP 0x4 /* SWAP */
112 #define LE_C3_ACON 0x2 /* ALE Control */
113 #define LE_C3_BCON 0x1 /* Byte control */
114
115 /* Receive message descriptor 1 */
116 #define LE_R1_OWN 0x80 /* Who owns the entry */
117 #define LE_R1_ERR 0x40 /* Error: if FRA, OFL, CRC or BUF is set */
118 #define LE_R1_FRA 0x20 /* FRA: Frame error */
119 #define LE_R1_OFL 0x10 /* OFL: Frame overflow */
120 #define LE_R1_CRC 0x08 /* CRC error */
121 #define LE_R1_BUF 0x04 /* BUF: Buffer error */
122 #define LE_R1_SOP 0x02 /* Start of packet */
123 #define LE_R1_EOP 0x01 /* End of packet */
124 #define LE_R1_POK 0x03 /* Packet is complete: SOP + EOP */
125
126 #define LE_T1_OWN 0x80 /* Lance owns the packet */
127 #define LE_T1_ERR 0x40 /* Error summary */
128 #define LE_T1_EMORE 0x10 /* Error: more than one retry needed */
129 #define LE_T1_EONE 0x08 /* Error: one retry needed */
130 #define LE_T1_EDEF 0x04 /* Error: deferred */
131 #define LE_T1_SOP 0x02 /* Start of packet */
132 #define LE_T1_EOP 0x01 /* End of packet */
133 #define LE_T1_POK 0x03 /* Packet is complete: SOP + EOP */
134
135 #define LE_T3_BUF 0x8000 /* Buffer error */
136 #define LE_T3_UFL 0x4000 /* Error underflow */
137 #define LE_T3_LCOL 0x1000 /* Error late collision */
138 #define LE_T3_CLOS 0x0800 /* Error carrier loss */
139 #define LE_T3_RTY 0x0400 /* Error retry */
140 #define LE_T3_TDR 0x03ff /* Time Domain Reflectometry counter */
141
142 /* Define: 2^4 Tx buffers and 2^4 Rx buffers */
143
144 #ifndef LANCE_LOG_TX_BUFFERS
145 #define LANCE_LOG_TX_BUFFERS 4
146 #define LANCE_LOG_RX_BUFFERS 4
147 #endif
148
149 #define TX_RING_SIZE (1 << (LANCE_LOG_TX_BUFFERS))
150 #define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
151
152 #define RX_RING_SIZE (1 << (LANCE_LOG_RX_BUFFERS))
153 #define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
154
155 #define PKT_BUF_SZ 1536
156 #define RX_BUFF_SIZE PKT_BUF_SZ
157 #define TX_BUFF_SIZE PKT_BUF_SZ
158
159 #undef TEST_HITS
160 #define ZERO 0
161
162 /* The DS2000/3000 have a linear 64 KB buffer.
163
164 * The PMAD-AA has 128 kb buffer on-board.
165 *
166 * The IOASIC LANCE devices use a shared memory region. This region as seen
167 * from the CPU is (max) 128 KB long and has to be on an 128 KB boundary.
168 * The LANCE sees this as a 64 KB long continuous memory region.
169 *
170 * The LANCE's DMA address is used as an index in this buffer and DMA takes
171 * place in bursts of eight 16-Bit words which are packed into four 32-Bit words
172 * by the IOASIC. This leads to a strange padding: 16 bytes of valid data followed
173 * by a 16 byte gap :-(.
174 */
175
176 struct lance_rx_desc {
177 unsigned short rmd0; /* low address of packet */
178 short gap0;
179 unsigned char rmd1_hadr; /* high address of packet */
180 unsigned char rmd1_bits; /* descriptor bits */
181 short gap1;
182 short length; /* 2s complement (negative!)
183 of buffer length */
184 short gap2;
185 unsigned short mblength; /* actual number of bytes received */
186 short gap3;
187 };
188
189 struct lance_tx_desc {
190 unsigned short tmd0; /* low address of packet */
191 short gap0;
192 unsigned char tmd1_hadr; /* high address of packet */
193 unsigned char tmd1_bits; /* descriptor bits */
194 short gap1;
195 short length; /* 2s complement (negative!)
196 of buffer length */
197 short gap2;
198 unsigned short misc;
199 short gap3;
200 };
201
202
203 /* First part of the LANCE initialization block, described in databook. */
204 struct lance_init_block {
205 unsigned short mode; /* pre-set mode (reg. 15) */
206 short gap0;
207
208 unsigned char phys_addr[12]; /* physical ethernet address
209 only 0, 1, 4, 5, 8, 9 are valid
210 2, 3, 6, 7, 10, 11 are gaps */
211 unsigned short filter[8]; /* multicast filter
212 only 0, 2, 4, 6 are valid
213 1, 3, 5, 7 are gaps */
214
215 /* Receive and transmit ring base, along with extra bits. */
216 unsigned short rx_ptr; /* receive descriptor addr */
217 short gap1;
218 unsigned short rx_len; /* receive len and high addr */
219 short gap2;
220 unsigned short tx_ptr; /* transmit descriptor addr */
221 short gap3;
222 unsigned short tx_len; /* transmit len and high addr */
223 short gap4;
224 short gap5[8];
225
226 /* The buffer descriptors */
227 struct lance_rx_desc brx_ring[RX_RING_SIZE];
228 struct lance_tx_desc btx_ring[TX_RING_SIZE];
229 };
230
231 #define BUF_OFFSET_CPU sizeof(struct lance_init_block)
232 #define BUF_OFFSET_LNC (sizeof(struct lance_init_block)>>1)
233
234 #define libdesc_offset(rt, elem) \
235 ((__u32)(((unsigned long)(&(((struct lance_init_block *)0)->rt[elem])))))
236
237 /*
238 * This works *only* for the ring descriptors
239 */
240 #define LANCE_ADDR(x) (PHYSADDR(x) >> 1)
241
242 struct lance_private {
243 struct net_device *next;
244 int type;
245 int slot;
246 int dma_irq;
247 volatile struct lance_regs *ll;
248 volatile struct lance_init_block *init_block;
249
250 spinlock_t lock;
251
252 int rx_new, tx_new;
253 int rx_old, tx_old;
254
255 struct net_device_stats stats;
256
257 unsigned short busmaster_regval;
258
259 struct timer_list multicast_timer;
260
261 /* Pointers to the ring buffers as seen from the CPU */
262 char *rx_buf_ptr_cpu[RX_RING_SIZE];
263 char *tx_buf_ptr_cpu[TX_RING_SIZE];
264
265 /* Pointers to the ring buffers as seen from the LANCE */
266 char *rx_buf_ptr_lnc[RX_RING_SIZE];
267 char *tx_buf_ptr_lnc[TX_RING_SIZE];
268 };
269
270 #define TX_BUFFS_AVAIL ((lp->tx_old<=lp->tx_new)?\
271 lp->tx_old+TX_RING_MOD_MASK-lp->tx_new:\
272 lp->tx_old - lp->tx_new-1)
273
274 /* The lance control ports are at an absolute address, machine and tc-slot
275 * dependent.
276 * DECstations do only 32-bit access and the LANCE uses 16 bit addresses,
277 * so we have to give the structure an extra member making rap pointing
278 * at the right address
279 */
280 struct lance_regs {
281 volatile unsigned short rdp; /* register data port */
282 unsigned short pad;
283 volatile unsigned short rap; /* register address port */
284 };
285
286 int dec_lance_debug = 2;
287
288 static struct net_device *root_lance_dev;
289
290 static inline void writereg(volatile unsigned short *regptr, short value)
291 {
292 *regptr = value;
293 iob();
294 }
295
296 /* Load the CSR registers */
297 static void load_csrs(struct lance_private *lp)
298 {
299 volatile struct lance_regs *ll = lp->ll;
300 int leptr;
301
302 /* The address space as seen from the LANCE
303 * begins at address 0. HK
304 */
305 leptr = 0;
306
307 writereg(&ll->rap, LE_CSR1);
308 writereg(&ll->rdp, (leptr & 0xFFFF));
309 writereg(&ll->rap, LE_CSR2);
310 writereg(&ll->rdp, leptr >> 16);
311 writereg(&ll->rap, LE_CSR3);
312 writereg(&ll->rdp, lp->busmaster_regval);
313
314 /* Point back to csr0 */
315 writereg(&ll->rap, LE_CSR0);
316 }
317
318 /*
319 * Our specialized copy routines
320 *
321 */
322 void cp_to_buf(const int type, void *to, const void *from, int len)
323 {
324 unsigned short *tp, *fp, clen;
325 unsigned char *rtp, *rfp;
326
327 if (type == PMAX_LANCE) {
328 clen = len >> 1;
329 tp = (unsigned short *) to;
330 fp = (unsigned short *) from;
331
332 while (clen--) {
333 *tp++ = *fp++;
334 tp++;
335 }
336
337 clen = len & 1;
338 rtp = (unsigned char *) tp;
339 rfp = (unsigned char *) fp;
340 while (clen--) {
341 *rtp++ = *rfp++;
342 }
343 } else {
344 /*
345 * copy 16 Byte chunks
346 */
347 clen = len >> 4;
348 tp = (unsigned short *) to;
349 fp = (unsigned short *) from;
350 while (clen--) {
351 *tp++ = *fp++;
352 *tp++ = *fp++;
353 *tp++ = *fp++;
354 *tp++ = *fp++;
355 *tp++ = *fp++;
356 *tp++ = *fp++;
357 *tp++ = *fp++;
358 *tp++ = *fp++;
359 tp += 8;
360 }
361
362 /*
363 * do the rest, if any.
364 */
365 clen = len & 15;
366 rtp = (unsigned char *) tp;
367 rfp = (unsigned char *) fp;
368 while (clen--) {
369 *rtp++ = *rfp++;
370 }
371 }
372
373 iob();
374 }
375
376 void cp_from_buf(const int type, void *to, const void *from, int len)
377 {
378 unsigned short *tp, *fp, clen;
379 unsigned char *rtp, *rfp;
380
381 if (type == PMAX_LANCE) {
382 clen = len >> 1;
383 tp = (unsigned short *) to;
384 fp = (unsigned short *) from;
385 while (clen--) {
386 *tp++ = *fp++;
387 fp++;
388 }
389
390 clen = len & 1;
391
392 rtp = (unsigned char *) tp;
393 rfp = (unsigned char *) fp;
394
395 while (clen--) {
396 *rtp++ = *rfp++;
397 }
398 } else {
399
400 /*
401 * copy 16 Byte chunks
402 */
403 clen = len >> 4;
404 tp = (unsigned short *) to;
405 fp = (unsigned short *) from;
406 while (clen--) {
407 *tp++ = *fp++;
408 *tp++ = *fp++;
409 *tp++ = *fp++;
410 *tp++ = *fp++;
411 *tp++ = *fp++;
412 *tp++ = *fp++;
413 *tp++ = *fp++;
414 *tp++ = *fp++;
415 fp += 8;
416 }
417
418 /*
419 * do the rest, if any.
420 */
421 clen = len & 15;
422 rtp = (unsigned char *) tp;
423 rfp = (unsigned char *) fp;
424 while (clen--) {
425 *rtp++ = *rfp++;
426 }
427
428
429 }
430
431 }
432
433 /* Setup the Lance Rx and Tx rings */
434 static void lance_init_ring(struct net_device *dev)
435 {
436 struct lance_private *lp = netdev_priv(dev);
437 volatile struct lance_init_block *ib;
438 int leptr;
439 int i;
440
441 ib = (struct lance_init_block *) (dev->mem_start);
442
443 /* Lock out other processes while setting up hardware */
444 netif_stop_queue(dev);
445 lp->rx_new = lp->tx_new = 0;
446 lp->rx_old = lp->tx_old = 0;
447
448 /* Copy the ethernet address to the lance init block.
449 * XXX bit 0 of the physical address registers has to be zero
450 */
451 ib->phys_addr[0] = dev->dev_addr[0];
452 ib->phys_addr[1] = dev->dev_addr[1];
453 ib->phys_addr[4] = dev->dev_addr[2];
454 ib->phys_addr[5] = dev->dev_addr[3];
455 ib->phys_addr[8] = dev->dev_addr[4];
456 ib->phys_addr[9] = dev->dev_addr[5];
457 /* Setup the initialization block */
458
459 /* Setup rx descriptor pointer */
460 leptr = LANCE_ADDR(libdesc_offset(brx_ring, 0));
461 ib->rx_len = (LANCE_LOG_RX_BUFFERS << 13) | (leptr >> 16);
462 ib->rx_ptr = leptr;
463 if (ZERO)
464 printk("RX ptr: %8.8x(%8.8x)\n", leptr, libdesc_offset(brx_ring, 0));
465
466 /* Setup tx descriptor pointer */
467 leptr = LANCE_ADDR(libdesc_offset(btx_ring, 0));
468 ib->tx_len = (LANCE_LOG_TX_BUFFERS << 13) | (leptr >> 16);
469 ib->tx_ptr = leptr;
470 if (ZERO)
471 printk("TX ptr: %8.8x(%8.8x)\n", leptr, libdesc_offset(btx_ring, 0));
472
473 if (ZERO)
474 printk("TX rings:\n");
475
476 /* Setup the Tx ring entries */
477 for (i = 0; i < TX_RING_SIZE; i++) {
478 leptr = (int) lp->tx_buf_ptr_lnc[i];
479 ib->btx_ring[i].tmd0 = leptr;
480 ib->btx_ring[i].tmd1_hadr = leptr >> 16;
481 ib->btx_ring[i].tmd1_bits = 0;
482 ib->btx_ring[i].length = 0xf000; /* The ones required by tmd2 */
483 ib->btx_ring[i].misc = 0;
484 if (i < 3 && ZERO)
485 printk("%d: 0x%8.8x(0x%8.8x)\n", i, leptr, (int) lp->tx_buf_ptr_cpu[i]);
486 }
487
488 /* Setup the Rx ring entries */
489 if (ZERO)
490 printk("RX rings:\n");
491 for (i = 0; i < RX_RING_SIZE; i++) {
492 leptr = (int) lp->rx_buf_ptr_lnc[i];
493 ib->brx_ring[i].rmd0 = leptr;
494 ib->brx_ring[i].rmd1_hadr = leptr >> 16;
495 ib->brx_ring[i].rmd1_bits = LE_R1_OWN;
496 ib->brx_ring[i].length = -RX_BUFF_SIZE | 0xf000;
497 ib->brx_ring[i].mblength = 0;
498 if (i < 3 && ZERO)
499 printk("%d: 0x%8.8x(0x%8.8x)\n", i, leptr, (int) lp->rx_buf_ptr_cpu[i]);
500 }
501 iob();
502 }
503
504 static int init_restart_lance(struct lance_private *lp)
505 {
506 volatile struct lance_regs *ll = lp->ll;
507 int i;
508
509 writereg(&ll->rap, LE_CSR0);
510 writereg(&ll->rdp, LE_C0_INIT);
511
512 /* Wait for the lance to complete initialization */
513 for (i = 0; (i < 100) && !(ll->rdp & LE_C0_IDON); i++) {
514 udelay(10);
515 }
516 if ((i == 100) || (ll->rdp & LE_C0_ERR)) {
517 printk("LANCE unopened after %d ticks, csr0=%4.4x.\n", i, ll->rdp);
518 return -1;
519 }
520 if ((ll->rdp & LE_C0_ERR)) {
521 printk("LANCE unopened after %d ticks, csr0=%4.4x.\n", i, ll->rdp);
522 return -1;
523 }
524 writereg(&ll->rdp, LE_C0_IDON);
525 writereg(&ll->rdp, LE_C0_STRT);
526 writereg(&ll->rdp, LE_C0_INEA);
527
528 return 0;
529 }
530
531 static int lance_rx(struct net_device *dev)
532 {
533 struct lance_private *lp = netdev_priv(dev);
534 volatile struct lance_init_block *ib;
535 volatile struct lance_rx_desc *rd = 0;
536 unsigned char bits;
537 int len = 0;
538 struct sk_buff *skb = 0;
539 ib = (struct lance_init_block *) (dev->mem_start);
540
541 #ifdef TEST_HITS
542 {
543 int i;
544
545 printk("[");
546 for (i = 0; i < RX_RING_SIZE; i++) {
547 if (i == lp->rx_new)
548 printk("%s", ib->brx_ring[i].rmd1_bits &
549 LE_R1_OWN ? "_" : "X");
550 else
551 printk("%s", ib->brx_ring[i].rmd1_bits &
552 LE_R1_OWN ? "." : "1");
553 }
554 printk("]");
555 }
556 #endif
557
558 for (rd = &ib->brx_ring[lp->rx_new];
559 !((bits = rd->rmd1_bits) & LE_R1_OWN);
560 rd = &ib->brx_ring[lp->rx_new]) {
561
562 /* We got an incomplete frame? */
563 if ((bits & LE_R1_POK) != LE_R1_POK) {
564 lp->stats.rx_over_errors++;
565 lp->stats.rx_errors++;
566 } else if (bits & LE_R1_ERR) {
567 /* Count only the end frame as a rx error,
568 * not the beginning
569 */
570 if (bits & LE_R1_BUF)
571 lp->stats.rx_fifo_errors++;
572 if (bits & LE_R1_CRC)
573 lp->stats.rx_crc_errors++;
574 if (bits & LE_R1_OFL)
575 lp->stats.rx_over_errors++;
576 if (bits & LE_R1_FRA)
577 lp->stats.rx_frame_errors++;
578 if (bits & LE_R1_EOP)
579 lp->stats.rx_errors++;
580 } else {
581 len = (rd->mblength & 0xfff) - 4;
582 skb = dev_alloc_skb(len + 2);
583
584 if (skb == 0) {
585 printk("%s: Memory squeeze, deferring packet.\n",
586 dev->name);
587 lp->stats.rx_dropped++;
588 rd->mblength = 0;
589 rd->rmd1_bits = LE_R1_OWN;
590 lp->rx_new = (lp->rx_new + 1) & RX_RING_MOD_MASK;
591 return 0;
592 }
593 lp->stats.rx_bytes += len;
594
595 skb->dev = dev;
596 skb_reserve(skb, 2); /* 16 byte align */
597 skb_put(skb, len); /* make room */
598
599 cp_from_buf(lp->type, skb->data,
600 (char *)lp->rx_buf_ptr_cpu[lp->rx_new],
601 len);
602
603 skb->protocol = eth_type_trans(skb, dev);
604 netif_rx(skb);
605 dev->last_rx = jiffies;
606 lp->stats.rx_packets++;
607 }
608
609 /* Return the packet to the pool */
610 rd->mblength = 0;
611 rd->length = -RX_BUFF_SIZE | 0xf000;
612 rd->rmd1_bits = LE_R1_OWN;
613 lp->rx_new = (lp->rx_new + 1) & RX_RING_MOD_MASK;
614 }
615 return 0;
616 }
617
618 static void lance_tx(struct net_device *dev)
619 {
620 struct lance_private *lp = netdev_priv(dev);
621 volatile struct lance_init_block *ib;
622 volatile struct lance_regs *ll = lp->ll;
623 volatile struct lance_tx_desc *td;
624 int i, j;
625 int status;
626 ib = (struct lance_init_block *) (dev->mem_start);
627 j = lp->tx_old;
628
629 spin_lock(&lp->lock);
630
631 for (i = j; i != lp->tx_new; i = j) {
632 td = &ib->btx_ring[i];
633 /* If we hit a packet not owned by us, stop */
634 if (td->tmd1_bits & LE_T1_OWN)
635 break;
636
637 if (td->tmd1_bits & LE_T1_ERR) {
638 status = td->misc;
639
640 lp->stats.tx_errors++;
641 if (status & LE_T3_RTY)
642 lp->stats.tx_aborted_errors++;
643 if (status & LE_T3_LCOL)
644 lp->stats.tx_window_errors++;
645
646 if (status & LE_T3_CLOS) {
647 lp->stats.tx_carrier_errors++;
648 printk("%s: Carrier Lost\n", dev->name);
649 /* Stop the lance */
650 writereg(&ll->rap, LE_CSR0);
651 writereg(&ll->rdp, LE_C0_STOP);
652 lance_init_ring(dev);
653 load_csrs(lp);
654 init_restart_lance(lp);
655 goto out;
656 }
657 /* Buffer errors and underflows turn off the
658 * transmitter, restart the adapter.
659 */
660 if (status & (LE_T3_BUF | LE_T3_UFL)) {
661 lp->stats.tx_fifo_errors++;
662
663 printk("%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
664 dev->name);
665 /* Stop the lance */
666 writereg(&ll->rap, LE_CSR0);
667 writereg(&ll->rdp, LE_C0_STOP);
668 lance_init_ring(dev);
669 load_csrs(lp);
670 init_restart_lance(lp);
671 goto out;
672 }
673 } else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
674 /*
675 * So we don't count the packet more than once.
676 */
677 td->tmd1_bits &= ~(LE_T1_POK);
678
679 /* One collision before packet was sent. */
680 if (td->tmd1_bits & LE_T1_EONE)
681 lp->stats.collisions++;
682
683 /* More than one collision, be optimistic. */
684 if (td->tmd1_bits & LE_T1_EMORE)
685 lp->stats.collisions += 2;
686
687 lp->stats.tx_packets++;
688 }
689 j = (j + 1) & TX_RING_MOD_MASK;
690 }
691 lp->tx_old = j;
692 out:
693 if (netif_queue_stopped(dev) &&
694 TX_BUFFS_AVAIL > 0)
695 netif_wake_queue(dev);
696
697 spin_unlock(&lp->lock);
698 }
699
700 static void lance_dma_merr_int(const int irq, void *dev_id,
701 struct pt_regs *regs)
702 {
703 struct net_device *dev = (struct net_device *) dev_id;
704
705 printk("%s: DMA error\n", dev->name);
706 }
707
708 static irqreturn_t
709 lance_interrupt(const int irq, void *dev_id, struct pt_regs *regs)
710 {
711 struct net_device *dev = (struct net_device *) dev_id;
712 struct lance_private *lp = netdev_priv(dev);
713 volatile struct lance_regs *ll = lp->ll;
714 int csr0;
715
716 writereg(&ll->rap, LE_CSR0);
717 csr0 = ll->rdp;
718
719 /* Acknowledge all the interrupt sources ASAP */
720 writereg(&ll->rdp, csr0 & (LE_C0_INTR | LE_C0_TINT | LE_C0_RINT));
721
722 if ((csr0 & LE_C0_ERR)) {
723 /* Clear the error condition */
724 writereg(&ll->rdp, LE_C0_BABL | LE_C0_ERR | LE_C0_MISS |
725 LE_C0_CERR | LE_C0_MERR);
726 }
727 if (csr0 & LE_C0_RINT)
728 lance_rx(dev);
729
730 if (csr0 & LE_C0_TINT)
731 lance_tx(dev);
732
733 if (csr0 & LE_C0_BABL)
734 lp->stats.tx_errors++;
735
736 if (csr0 & LE_C0_MISS)
737 lp->stats.rx_errors++;
738
739 if (csr0 & LE_C0_MERR) {
740 printk("%s: Memory error, status %04x\n", dev->name, csr0);
741
742 writereg(&ll->rdp, LE_C0_STOP);
743
744 lance_init_ring(dev);
745 load_csrs(lp);
746 init_restart_lance(lp);
747 netif_wake_queue(dev);
748 }
749
750 writereg(&ll->rdp, LE_C0_INEA);
751 writereg(&ll->rdp, LE_C0_INEA);
752 return IRQ_HANDLED;
753 }
754
755 struct net_device *last_dev = 0;
756
757 static int lance_open(struct net_device *dev)
758 {
759 volatile struct lance_init_block *ib = (struct lance_init_block *) (dev->mem_start);
760 struct lance_private *lp = netdev_priv(dev);
761 volatile struct lance_regs *ll = lp->ll;
762 int status = 0;
763
764 last_dev = dev;
765
766 /* Stop the Lance */
767 writereg(&ll->rap, LE_CSR0);
768 writereg(&ll->rdp, LE_C0_STOP);
769
770 /* Set mode and clear multicast filter only at device open,
771 * so that lance_init_ring() called at any error will not
772 * forget multicast filters.
773 *
774 * BTW it is common bug in all lance drivers! --ANK
775 */
776 ib->mode = 0;
777 ib->filter [0] = 0;
778 ib->filter [2] = 0;
779 ib->filter [4] = 0;
780 ib->filter [6] = 0;
781
782 lance_init_ring(dev);
783 load_csrs(lp);
784
785 netif_start_queue(dev);
786
787 /* Associate IRQ with lance_interrupt */
788 if (request_irq(dev->irq, &lance_interrupt, 0, "lance", dev)) {
789 printk("%s: Can't get IRQ %d\n", dev->name, dev->irq);
790 return -EAGAIN;
791 }
792 if (lp->dma_irq >= 0) {
793 unsigned long flags;
794
795 if (request_irq(lp->dma_irq, &lance_dma_merr_int, 0,
796 "lance error", dev)) {
797 free_irq(dev->irq, dev);
798 printk("%s: Can't get DMA IRQ %d\n", dev->name,
799 lp->dma_irq);
800 return -EAGAIN;
801 }
802
803 spin_lock_irqsave(&ioasic_ssr_lock, flags);
804
805 fast_mb();
806 /* Enable I/O ASIC LANCE DMA. */
807 ioasic_write(IO_REG_SSR,
808 ioasic_read(IO_REG_SSR) | IO_SSR_LANCE_DMA_EN);
809
810 fast_mb();
811 spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
812 }
813
814 status = init_restart_lance(lp);
815 return status;
816 }
817
818 static int lance_close(struct net_device *dev)
819 {
820 struct lance_private *lp = netdev_priv(dev);
821 volatile struct lance_regs *ll = lp->ll;
822
823 netif_stop_queue(dev);
824 del_timer_sync(&lp->multicast_timer);
825
826 /* Stop the card */
827 writereg(&ll->rap, LE_CSR0);
828 writereg(&ll->rdp, LE_C0_STOP);
829
830 if (lp->dma_irq >= 0) {
831 unsigned long flags;
832
833 spin_lock_irqsave(&ioasic_ssr_lock, flags);
834
835 fast_mb();
836 /* Disable I/O ASIC LANCE DMA. */
837 ioasic_write(IO_REG_SSR,
838 ioasic_read(IO_REG_SSR) & ~IO_SSR_LANCE_DMA_EN);
839
840 fast_iob();
841 spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
842
843 free_irq(lp->dma_irq, dev);
844 }
845 free_irq(dev->irq, dev);
846 return 0;
847 }
848
849 static inline int lance_reset(struct net_device *dev)
850 {
851 struct lance_private *lp = netdev_priv(dev);
852 volatile struct lance_regs *ll = lp->ll;
853 int status;
854
855 /* Stop the lance */
856 writereg(&ll->rap, LE_CSR0);
857 writereg(&ll->rdp, LE_C0_STOP);
858
859 lance_init_ring(dev);
860 load_csrs(lp);
861 dev->trans_start = jiffies;
862 status = init_restart_lance(lp);
863 return status;
864 }
865
866 static void lance_tx_timeout(struct net_device *dev)
867 {
868 struct lance_private *lp = netdev_priv(dev);
869 volatile struct lance_regs *ll = lp->ll;
870
871 printk(KERN_ERR "%s: transmit timed out, status %04x, reset\n",
872 dev->name, ll->rdp);
873 lance_reset(dev);
874 netif_wake_queue(dev);
875 }
876
877 static int lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
878 {
879 struct lance_private *lp = netdev_priv(dev);
880 volatile struct lance_regs *ll = lp->ll;
881 volatile struct lance_init_block *ib = (struct lance_init_block *) (dev->mem_start);
882 int entry, skblen, len;
883
884 skblen = skb->len;
885
886 len = skblen;
887
888 if (len < ETH_ZLEN) {
889 skb = skb_padto(skb, ETH_ZLEN);
890 if (skb == NULL)
891 return 0;
892 len = ETH_ZLEN;
893 }
894
895 lp->stats.tx_bytes += len;
896
897 entry = lp->tx_new & TX_RING_MOD_MASK;
898 ib->btx_ring[entry].length = (-len);
899 ib->btx_ring[entry].misc = 0;
900
901 cp_to_buf(lp->type, (char *)lp->tx_buf_ptr_cpu[entry], skb->data,
902 skblen);
903
904 /* Clear the slack of the packet, do I need this? */
905 /* For a firewall it's a good idea - AC */
906 /*
907 if (len != skblen)
908 memset ((char *) &ib->tx_buf [entry][skblen], 0, (len - skblen) << 1);
909 */
910
911 /* Now, give the packet to the lance */
912 ib->btx_ring[entry].tmd1_bits = (LE_T1_POK | LE_T1_OWN);
913 lp->tx_new = (lp->tx_new + 1) & TX_RING_MOD_MASK;
914
915 if (TX_BUFFS_AVAIL <= 0)
916 netif_stop_queue(dev);
917
918 /* Kick the lance: transmit now */
919 writereg(&ll->rdp, LE_C0_INEA | LE_C0_TDMD);
920
921 spin_unlock_irq(&lp->lock);
922
923 dev->trans_start = jiffies;
924 dev_kfree_skb(skb);
925
926 return 0;
927 }
928
929 static struct net_device_stats *lance_get_stats(struct net_device *dev)
930 {
931 struct lance_private *lp = netdev_priv(dev);
932
933 return &lp->stats;
934 }
935
936 static void lance_load_multicast(struct net_device *dev)
937 {
938 volatile struct lance_init_block *ib = (struct lance_init_block *) (dev->mem_start);
939 volatile u16 *mcast_table = (u16 *) & ib->filter;
940 struct dev_mc_list *dmi = dev->mc_list;
941 char *addrs;
942 int i;
943 u32 crc;
944
945 /* set all multicast bits */
946 if (dev->flags & IFF_ALLMULTI) {
947 ib->filter[0] = 0xffff;
948 ib->filter[2] = 0xffff;
949 ib->filter[4] = 0xffff;
950 ib->filter[6] = 0xffff;
951 return;
952 }
953 /* clear the multicast filter */
954 ib->filter[0] = 0;
955 ib->filter[2] = 0;
956 ib->filter[4] = 0;
957 ib->filter[6] = 0;
958
959 /* Add addresses */
960 for (i = 0; i < dev->mc_count; i++) {
961 addrs = dmi->dmi_addr;
962 dmi = dmi->next;
963
964 /* multicast address? */
965 if (!(*addrs & 1))
966 continue;
967
968 crc = ether_crc_le(ETH_ALEN, addrs);
969 crc = crc >> 26;
970 mcast_table[2 * (crc >> 4)] |= 1 << (crc & 0xf);
971 }
972 return;
973 }
974
975 static void lance_set_multicast(struct net_device *dev)
976 {
977 struct lance_private *lp = netdev_priv(dev);
978 volatile struct lance_init_block *ib;
979 volatile struct lance_regs *ll = lp->ll;
980
981 ib = (struct lance_init_block *) (dev->mem_start);
982
983 if (!netif_running(dev))
984 return;
985
986 if (lp->tx_old != lp->tx_new) {
987 mod_timer(&lp->multicast_timer, jiffies + 4 * HZ/100);
988 netif_wake_queue(dev);
989 return;
990 }
991
992 netif_stop_queue(dev);
993
994 writereg(&ll->rap, LE_CSR0);
995 writereg(&ll->rdp, LE_C0_STOP);
996
997 lance_init_ring(dev);
998
999 if (dev->flags & IFF_PROMISC) {
1000 ib->mode |= LE_MO_PROM;
1001 } else {
1002 ib->mode &= ~LE_MO_PROM;
1003 lance_load_multicast(dev);
1004 }
1005 load_csrs(lp);
1006 init_restart_lance(lp);
1007 netif_wake_queue(dev);
1008 }
1009
1010 static void lance_set_multicast_retry(unsigned long _opaque)
1011 {
1012 struct net_device *dev = (struct net_device *) _opaque;
1013
1014 lance_set_multicast(dev);
1015 }
1016
1017 static int __init dec_lance_init(const int type, const int slot)
1018 {
1019 static unsigned version_printed;
1020 static const char fmt[] = "declance%d";
1021 char name[10];
1022 struct net_device *dev;
1023 struct lance_private *lp;
1024 volatile struct lance_regs *ll;
1025 int i, ret;
1026 unsigned long esar_base;
1027 unsigned char *esar;
1028
1029 #ifndef CONFIG_TC
1030 system_base = KN01_LANCE_BASE;
1031 #endif
1032
1033 if (dec_lance_debug && version_printed++ == 0)
1034 printk(version);
1035
1036 i = 0;
1037 dev = root_lance_dev;
1038 while (dev) {
1039 i++;
1040 lp = (struct lance_private *)dev->priv;
1041 dev = lp->next;
1042 }
1043 snprintf(name, sizeof(name), fmt, i);
1044
1045 dev = alloc_etherdev(sizeof(struct lance_private));
1046 if (!dev) {
1047 printk(KERN_ERR "%s: Unable to allocate etherdev, aborting.\n",
1048 name);
1049 ret = -ENOMEM;
1050 goto err_out;
1051 }
1052
1053 /*
1054 * alloc_etherdev ensures the data structures used by the LANCE
1055 * are aligned.
1056 */
1057 lp = netdev_priv(dev);
1058 spin_lock_init(&lp->lock);
1059
1060 lp->type = type;
1061 lp->slot = slot;
1062 switch (type) {
1063 #ifdef CONFIG_TC
1064 case ASIC_LANCE:
1065 dev->base_addr = system_base + IOASIC_LANCE;
1066
1067 /* buffer space for the on-board LANCE shared memory */
1068 /*
1069 * FIXME: ugly hack!
1070 */
1071 dev->mem_start = KSEG1ADDR(0x00020000);
1072 dev->mem_end = dev->mem_start + 0x00020000;
1073 dev->irq = dec_interrupt[DEC_IRQ_LANCE];
1074 esar_base = system_base + IOASIC_ESAR;
1075
1076 /* Workaround crash with booting KN04 2.1k from Disk */
1077 memset((void *)dev->mem_start, 0,
1078 dev->mem_end - dev->mem_start);
1079
1080 /*
1081 * setup the pointer arrays, this sucks [tm] :-(
1082 */
1083 for (i = 0; i < RX_RING_SIZE; i++) {
1084 lp->rx_buf_ptr_cpu[i] =
1085 (char *)(dev->mem_start + BUF_OFFSET_CPU +
1086 2 * i * RX_BUFF_SIZE);
1087 lp->rx_buf_ptr_lnc[i] =
1088 (char *)(BUF_OFFSET_LNC + i * RX_BUFF_SIZE);
1089 }
1090 for (i = 0; i < TX_RING_SIZE; i++) {
1091 lp->tx_buf_ptr_cpu[i] =
1092 (char *)(dev->mem_start + BUF_OFFSET_CPU +
1093 2 * RX_RING_SIZE * RX_BUFF_SIZE +
1094 2 * i * TX_BUFF_SIZE);
1095 lp->tx_buf_ptr_lnc[i] =
1096 (char *)(BUF_OFFSET_LNC +
1097 RX_RING_SIZE * RX_BUFF_SIZE +
1098 i * TX_BUFF_SIZE);
1099 }
1100
1101 /* Setup I/O ASIC LANCE DMA. */
1102 lp->dma_irq = dec_interrupt[DEC_IRQ_LANCE_MERR];
1103 ioasic_write(IO_REG_LANCE_DMA_P,
1104 PHYSADDR(dev->mem_start) << 3);
1105
1106 break;
1107
1108 case PMAD_LANCE:
1109 claim_tc_card(slot);
1110
1111 dev->mem_start = get_tc_base_addr(slot);
1112 dev->base_addr = dev->mem_start + 0x100000;
1113 dev->irq = get_tc_irq_nr(slot);
1114 esar_base = dev->mem_start + 0x1c0002;
1115 lp->dma_irq = -1;
1116
1117 for (i = 0; i < RX_RING_SIZE; i++) {
1118 lp->rx_buf_ptr_cpu[i] =
1119 (char *)(dev->mem_start + BUF_OFFSET_CPU +
1120 i * RX_BUFF_SIZE);
1121 lp->rx_buf_ptr_lnc[i] =
1122 (char *)(BUF_OFFSET_LNC + i * RX_BUFF_SIZE);
1123 }
1124 for (i = 0; i < TX_RING_SIZE; i++) {
1125 lp->tx_buf_ptr_cpu[i] =
1126 (char *)(dev->mem_start + BUF_OFFSET_CPU +
1127 RX_RING_SIZE * RX_BUFF_SIZE +
1128 i * TX_BUFF_SIZE);
1129 lp->tx_buf_ptr_lnc[i] =
1130 (char *)(BUF_OFFSET_LNC +
1131 RX_RING_SIZE * RX_BUFF_SIZE +
1132 i * TX_BUFF_SIZE);
1133 }
1134
1135 break;
1136 #endif
1137
1138 case PMAX_LANCE:
1139 dev->irq = dec_interrupt[DEC_IRQ_LANCE];
1140 dev->base_addr = KN01_LANCE_BASE;
1141 dev->mem_start = KN01_LANCE_BASE + 0x01000000;
1142 esar_base = KN01_RTC_BASE + 1;
1143 lp->dma_irq = -1;
1144
1145 /*
1146 * setup the pointer arrays, this sucks [tm] :-(
1147 */
1148 for (i = 0; i < RX_RING_SIZE; i++) {
1149 lp->rx_buf_ptr_cpu[i] =
1150 (char *)(dev->mem_start + BUF_OFFSET_CPU +
1151 2 * i * RX_BUFF_SIZE);
1152 lp->rx_buf_ptr_lnc[i] =
1153 (char *)(BUF_OFFSET_LNC + i * RX_BUFF_SIZE);
1154 }
1155 for (i = 0; i < TX_RING_SIZE; i++) {
1156 lp->tx_buf_ptr_cpu[i] =
1157 (char *)(dev->mem_start + BUF_OFFSET_CPU +
1158 2 * RX_RING_SIZE * RX_BUFF_SIZE +
1159 2 * i * TX_BUFF_SIZE);
1160 lp->tx_buf_ptr_lnc[i] =
1161 (char *)(BUF_OFFSET_LNC +
1162 RX_RING_SIZE * RX_BUFF_SIZE +
1163 i * TX_BUFF_SIZE);
1164 }
1165
1166 break;
1167
1168 default:
1169 printk(KERN_ERR "%s: declance_init called with unknown type\n",
1170 name);
1171 ret = -ENODEV;
1172 goto err_out_free_dev;
1173 }
1174
1175 ll = (struct lance_regs *) dev->base_addr;
1176 esar = (unsigned char *) esar_base;
1177
1178 /* prom checks */
1179 /* First, check for test pattern */
1180 if (esar[0x60] != 0xff && esar[0x64] != 0x00 &&
1181 esar[0x68] != 0x55 && esar[0x6c] != 0xaa) {
1182 printk(KERN_ERR
1183 "%s: Ethernet station address prom not found!\n",
1184 name);
1185 ret = -ENODEV;
1186 goto err_out_free_dev;
1187 }
1188 /* Check the prom contents */
1189 for (i = 0; i < 8; i++) {
1190 if (esar[i * 4] != esar[0x3c - i * 4] &&
1191 esar[i * 4] != esar[0x40 + i * 4] &&
1192 esar[0x3c - i * 4] != esar[0x40 + i * 4]) {
1193 printk(KERN_ERR "%s: Something is wrong with the "
1194 "ethernet station address prom!\n", name);
1195 ret = -ENODEV;
1196 goto err_out_free_dev;
1197 }
1198 }
1199
1200 /* Copy the ethernet address to the device structure, later to the
1201 * lance initialization block so the lance gets it every time it's
1202 * (re)initialized.
1203 */
1204 switch (type) {
1205 case ASIC_LANCE:
1206 printk("%s: IOASIC onboard LANCE, addr = ", name);
1207 break;
1208 case PMAD_LANCE:
1209 printk("%s: PMAD-AA, addr = ", name);
1210 break;
1211 case PMAX_LANCE:
1212 printk("%s: PMAX onboard LANCE, addr = ", name);
1213 break;
1214 }
1215 for (i = 0; i < 6; i++) {
1216 dev->dev_addr[i] = esar[i * 4];
1217 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? ',' : ':');
1218 }
1219
1220 printk(" irq = %d\n", dev->irq);
1221
1222 dev->open = &lance_open;
1223 dev->stop = &lance_close;
1224 dev->hard_start_xmit = &lance_start_xmit;
1225 dev->tx_timeout = &lance_tx_timeout;
1226 dev->watchdog_timeo = 5*HZ;
1227 dev->get_stats = &lance_get_stats;
1228 dev->set_multicast_list = &lance_set_multicast;
1229
1230 /* lp->ll is the location of the registers for lance card */
1231 lp->ll = ll;
1232
1233 /* busmaster_regval (CSR3) should be zero according to the PMAD-AA
1234 * specification.
1235 */
1236 lp->busmaster_regval = 0;
1237
1238 dev->dma = 0;
1239
1240 /* We cannot sleep if the chip is busy during a
1241 * multicast list update event, because such events
1242 * can occur from interrupts (ex. IPv6). So we
1243 * use a timer to try again later when necessary. -DaveM
1244 */
1245 init_timer(&lp->multicast_timer);
1246 lp->multicast_timer.data = (unsigned long) dev;
1247 lp->multicast_timer.function = &lance_set_multicast_retry;
1248
1249 ret = register_netdev(dev);
1250 if (ret) {
1251 printk(KERN_ERR
1252 "%s: Unable to register netdev, aborting.\n", name);
1253 goto err_out_free_dev;
1254 }
1255
1256 lp->next = root_lance_dev;
1257 root_lance_dev = dev;
1258
1259 printk("%s: registered as %s.\n", name, dev->name);
1260 return 0;
1261
1262 err_out_free_dev:
1263 kfree(dev);
1264
1265 err_out:
1266 return ret;
1267 }
1268
1269
1270 /* Find all the lance cards on the system and initialize them */
1271 static int __init dec_lance_probe(void)
1272 {
1273 int count = 0;
1274
1275 /* Scan slots for PMAD-AA cards first. */
1276 #ifdef CONFIG_TC
1277 if (TURBOCHANNEL) {
1278 int slot;
1279
1280 while ((slot = search_tc_card("PMAD-AA")) >= 0) {
1281 if (dec_lance_init(PMAD_LANCE, slot) < 0)
1282 break;
1283 count++;
1284 }
1285 }
1286 #endif
1287
1288 /* Then handle onboard devices. */
1289 if (dec_interrupt[DEC_IRQ_LANCE] >= 0) {
1290 if (dec_interrupt[DEC_IRQ_LANCE_MERR] >= 0) {
1291 #ifdef CONFIG_TC
1292 if (dec_lance_init(ASIC_LANCE, -1) >= 0)
1293 count++;
1294 #endif
1295 } else if (!TURBOCHANNEL) {
1296 if (dec_lance_init(PMAX_LANCE, -1) >= 0)
1297 count++;
1298 }
1299 }
1300
1301 return (count > 0) ? 0 : -ENODEV;
1302 }
1303
1304 static void __exit dec_lance_cleanup(void)
1305 {
1306 while (root_lance_dev) {
1307 struct net_device *dev = root_lance_dev;
1308 struct lance_private *lp = netdev_priv(dev);
1309 unregister_netdev(dev);
1310 #ifdef CONFIG_TC
1311 if (lp->slot >= 0)
1312 release_tc_card(lp->slot);
1313 #endif
1314 root_lance_dev = lp->next;
1315 free_netdev(dev);
1316 }
1317 }
1318
1319 module_init(dec_lance_probe);
1320 module_exit(dec_lance_cleanup);
Linux with added FPC-III support