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[PATCH] add bottom_half.h
[linux-2.6/openmoko-kernel.git] / drivers / net / declance.c
blob00e2a8a134d7a2993530e29f97ac86d4458bf924
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, 2005 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/crc32.h>
46 #include <linux/delay.h>
47 #include <linux/errno.h>
48 #include <linux/if_ether.h>
49 #include <linux/init.h>
50 #include <linux/kernel.h>
51 #include <linux/module.h>
52 #include <linux/netdevice.h>
53 #include <linux/etherdevice.h>
54 #include <linux/spinlock.h>
55 #include <linux/stddef.h>
56 #include <linux/string.h>
57
58 #include <asm/addrspace.h>
59 #include <asm/system.h>
60
61 #include <asm/dec/interrupts.h>
62 #include <asm/dec/ioasic.h>
63 #include <asm/dec/ioasic_addrs.h>
64 #include <asm/dec/kn01.h>
65 #include <asm/dec/machtype.h>
66 #include <asm/dec/system.h>
67 #include <asm/dec/tc.h>
68
69 static char version[] __devinitdata =
70 "declance.c: v0.009 by Linux MIPS DECstation task force\n";
71
72 MODULE_AUTHOR("Linux MIPS DECstation task force");
73 MODULE_DESCRIPTION("DEC LANCE (DECstation onboard, PMAD-xx) driver");
74 MODULE_LICENSE("GPL");
75
76 /*
77 * card types
78 */
79 #define ASIC_LANCE 1
80 #define PMAD_LANCE 2
81 #define PMAX_LANCE 3
82
83
84 #define LE_CSR0 0
85 #define LE_CSR1 1
86 #define LE_CSR2 2
87 #define LE_CSR3 3
88
89 #define LE_MO_PROM 0x8000 /* Enable promiscuous mode */
90
91 #define LE_C0_ERR 0x8000 /* Error: set if BAB, SQE, MISS or ME is set */
92 #define LE_C0_BABL 0x4000 /* BAB: Babble: tx timeout. */
93 #define LE_C0_CERR 0x2000 /* SQE: Signal quality error */
94 #define LE_C0_MISS 0x1000 /* MISS: Missed a packet */
95 #define LE_C0_MERR 0x0800 /* ME: Memory error */
96 #define LE_C0_RINT 0x0400 /* Received interrupt */
97 #define LE_C0_TINT 0x0200 /* Transmitter Interrupt */
98 #define LE_C0_IDON 0x0100 /* IFIN: Init finished. */
99 #define LE_C0_INTR 0x0080 /* Interrupt or error */
100 #define LE_C0_INEA 0x0040 /* Interrupt enable */
101 #define LE_C0_RXON 0x0020 /* Receiver on */
102 #define LE_C0_TXON 0x0010 /* Transmitter on */
103 #define LE_C0_TDMD 0x0008 /* Transmitter demand */
104 #define LE_C0_STOP 0x0004 /* Stop the card */
105 #define LE_C0_STRT 0x0002 /* Start the card */
106 #define LE_C0_INIT 0x0001 /* Init the card */
107
108 #define LE_C3_BSWP 0x4 /* SWAP */
109 #define LE_C3_ACON 0x2 /* ALE Control */
110 #define LE_C3_BCON 0x1 /* Byte control */
111
112 /* Receive message descriptor 1 */
113 #define LE_R1_OWN 0x80 /* Who owns the entry */
114 #define LE_R1_ERR 0x40 /* Error: if FRA, OFL, CRC or BUF is set */
115 #define LE_R1_FRA 0x20 /* FRA: Frame error */
116 #define LE_R1_OFL 0x10 /* OFL: Frame overflow */
117 #define LE_R1_CRC 0x08 /* CRC error */
118 #define LE_R1_BUF 0x04 /* BUF: Buffer error */
119 #define LE_R1_SOP 0x02 /* Start of packet */
120 #define LE_R1_EOP 0x01 /* End of packet */
121 #define LE_R1_POK 0x03 /* Packet is complete: SOP + EOP */
122
123 #define LE_T1_OWN 0x80 /* Lance owns the packet */
124 #define LE_T1_ERR 0x40 /* Error summary */
125 #define LE_T1_EMORE 0x10 /* Error: more than one retry needed */
126 #define LE_T1_EONE 0x08 /* Error: one retry needed */
127 #define LE_T1_EDEF 0x04 /* Error: deferred */
128 #define LE_T1_SOP 0x02 /* Start of packet */
129 #define LE_T1_EOP 0x01 /* End of packet */
130 #define LE_T1_POK 0x03 /* Packet is complete: SOP + EOP */
131
132 #define LE_T3_BUF 0x8000 /* Buffer error */
133 #define LE_T3_UFL 0x4000 /* Error underflow */
134 #define LE_T3_LCOL 0x1000 /* Error late collision */
135 #define LE_T3_CLOS 0x0800 /* Error carrier loss */
136 #define LE_T3_RTY 0x0400 /* Error retry */
137 #define LE_T3_TDR 0x03ff /* Time Domain Reflectometry counter */
138
139 /* Define: 2^4 Tx buffers and 2^4 Rx buffers */
140
141 #ifndef LANCE_LOG_TX_BUFFERS
142 #define LANCE_LOG_TX_BUFFERS 4
143 #define LANCE_LOG_RX_BUFFERS 4
144 #endif
145
146 #define TX_RING_SIZE (1 << (LANCE_LOG_TX_BUFFERS))
147 #define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
148
149 #define RX_RING_SIZE (1 << (LANCE_LOG_RX_BUFFERS))
150 #define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
151
152 #define PKT_BUF_SZ 1536
153 #define RX_BUFF_SIZE PKT_BUF_SZ
154 #define TX_BUFF_SIZE PKT_BUF_SZ
155
156 #undef TEST_HITS
157 #define ZERO 0
158
159 /* The DS2000/3000 have a linear 64 KB buffer.
160
161 * The PMAD-AA has 128 kb buffer on-board.
162 *
163 * The IOASIC LANCE devices use a shared memory region. This region as seen
164 * from the CPU is (max) 128 KB long and has to be on an 128 KB boundary.
165 * The LANCE sees this as a 64 KB long continuous memory region.
166 *
167 * The LANCE's DMA address is used as an index in this buffer and DMA takes
168 * place in bursts of eight 16-Bit words which are packed into four 32-Bit words
169 * by the IOASIC. This leads to a strange padding: 16 bytes of valid data followed
170 * by a 16 byte gap :-(.
171 */
172
173 struct lance_rx_desc {
174 unsigned short rmd0; /* low address of packet */
175 short gap0;
176 unsigned char rmd1_hadr; /* high address of packet */
177 unsigned char rmd1_bits; /* descriptor bits */
178 short gap1;
179 short length; /* 2s complement (negative!)
180 of buffer length */
181 short gap2;
182 unsigned short mblength; /* actual number of bytes received */
183 short gap3;
184 };
185
186 struct lance_tx_desc {
187 unsigned short tmd0; /* low address of packet */
188 short gap0;
189 unsigned char tmd1_hadr; /* high address of packet */
190 unsigned char tmd1_bits; /* descriptor bits */
191 short gap1;
192 short length; /* 2s complement (negative!)
193 of buffer length */
194 short gap2;
195 unsigned short misc;
196 short gap3;
197 };
198
199
200 /* First part of the LANCE initialization block, described in databook. */
201 struct lance_init_block {
202 unsigned short mode; /* pre-set mode (reg. 15) */
203 short gap0;
204
205 unsigned char phys_addr[12]; /* physical ethernet address
206 only 0, 1, 4, 5, 8, 9 are valid
207 2, 3, 6, 7, 10, 11 are gaps */
208 unsigned short filter[8]; /* multicast filter
209 only 0, 2, 4, 6 are valid
210 1, 3, 5, 7 are gaps */
211
212 /* Receive and transmit ring base, along with extra bits. */
213 unsigned short rx_ptr; /* receive descriptor addr */
214 short gap1;
215 unsigned short rx_len; /* receive len and high addr */
216 short gap2;
217 unsigned short tx_ptr; /* transmit descriptor addr */
218 short gap3;
219 unsigned short tx_len; /* transmit len and high addr */
220 short gap4;
221 short gap5[8];
222
223 /* The buffer descriptors */
224 struct lance_rx_desc brx_ring[RX_RING_SIZE];
225 struct lance_tx_desc btx_ring[TX_RING_SIZE];
226 };
227
228 #define BUF_OFFSET_CPU sizeof(struct lance_init_block)
229 #define BUF_OFFSET_LNC (sizeof(struct lance_init_block)>>1)
230
231 #define libdesc_offset(rt, elem) \
232 ((__u32)(((unsigned long)(&(((struct lance_init_block *)0)->rt[elem])))))
233
234 /*
235 * This works *only* for the ring descriptors
236 */
237 #define LANCE_ADDR(x) (CPHYSADDR(x) >> 1)
238
239 struct lance_private {
240 struct net_device *next;
241 int type;
242 int slot;
243 int dma_irq;
244 volatile struct lance_regs *ll;
245 volatile struct lance_init_block *init_block;
246
247 spinlock_t lock;
248
249 int rx_new, tx_new;
250 int rx_old, tx_old;
251
252 struct net_device_stats stats;
253
254 unsigned short busmaster_regval;
255
256 struct timer_list multicast_timer;
257
258 /* Pointers to the ring buffers as seen from the CPU */
259 char *rx_buf_ptr_cpu[RX_RING_SIZE];
260 char *tx_buf_ptr_cpu[TX_RING_SIZE];
261
262 /* Pointers to the ring buffers as seen from the LANCE */
263 char *rx_buf_ptr_lnc[RX_RING_SIZE];
264 char *tx_buf_ptr_lnc[TX_RING_SIZE];
265 };
266
267 #define TX_BUFFS_AVAIL ((lp->tx_old<=lp->tx_new)?\
268 lp->tx_old+TX_RING_MOD_MASK-lp->tx_new:\
269 lp->tx_old - lp->tx_new-1)
270
271 /* The lance control ports are at an absolute address, machine and tc-slot
272 * dependent.
273 * DECstations do only 32-bit access and the LANCE uses 16 bit addresses,
274 * so we have to give the structure an extra member making rap pointing
275 * at the right address
276 */
277 struct lance_regs {
278 volatile unsigned short rdp; /* register data port */
279 unsigned short pad;
280 volatile unsigned short rap; /* register address port */
281 };
282
283 int dec_lance_debug = 2;
284
285 static struct net_device *root_lance_dev;
286
287 static inline void writereg(volatile unsigned short *regptr, short value)
288 {
289 *regptr = value;
290 iob();
291 }
292
293 /* Load the CSR registers */
294 static void load_csrs(struct lance_private *lp)
295 {
296 volatile struct lance_regs *ll = lp->ll;
297 int leptr;
298
299 /* The address space as seen from the LANCE
300 * begins at address 0. HK
301 */
302 leptr = 0;
303
304 writereg(&ll->rap, LE_CSR1);
305 writereg(&ll->rdp, (leptr & 0xFFFF));
306 writereg(&ll->rap, LE_CSR2);
307 writereg(&ll->rdp, leptr >> 16);
308 writereg(&ll->rap, LE_CSR3);
309 writereg(&ll->rdp, lp->busmaster_regval);
310
311 /* Point back to csr0 */
312 writereg(&ll->rap, LE_CSR0);
313 }
314
315 /*
316 * Our specialized copy routines
317 *
318 */
319 void cp_to_buf(const int type, void *to, const void *from, int len)
320 {
321 unsigned short *tp, *fp, clen;
322 unsigned char *rtp, *rfp;
323
324 if (type == PMAX_LANCE) {
325 clen = len >> 1;
326 tp = (unsigned short *) to;
327 fp = (unsigned short *) from;
328
329 while (clen--) {
330 *tp++ = *fp++;
331 tp++;
332 }
333
334 clen = len & 1;
335 rtp = (unsigned char *) tp;
336 rfp = (unsigned char *) fp;
337 while (clen--) {
338 *rtp++ = *rfp++;
339 }
340 } else {
341 /*
342 * copy 16 Byte chunks
343 */
344 clen = len >> 4;
345 tp = (unsigned short *) to;
346 fp = (unsigned short *) from;
347 while (clen--) {
348 *tp++ = *fp++;
349 *tp++ = *fp++;
350 *tp++ = *fp++;
351 *tp++ = *fp++;
352 *tp++ = *fp++;
353 *tp++ = *fp++;
354 *tp++ = *fp++;
355 *tp++ = *fp++;
356 tp += 8;
357 }
358
359 /*
360 * do the rest, if any.
361 */
362 clen = len & 15;
363 rtp = (unsigned char *) tp;
364 rfp = (unsigned char *) fp;
365 while (clen--) {
366 *rtp++ = *rfp++;
367 }
368 }
369
370 iob();
371 }
372
373 void cp_from_buf(const int type, void *to, const void *from, int len)
374 {
375 unsigned short *tp, *fp, clen;
376 unsigned char *rtp, *rfp;
377
378 if (type == PMAX_LANCE) {
379 clen = len >> 1;
380 tp = (unsigned short *) to;
381 fp = (unsigned short *) from;
382 while (clen--) {
383 *tp++ = *fp++;
384 fp++;
385 }
386
387 clen = len & 1;
388
389 rtp = (unsigned char *) tp;
390 rfp = (unsigned char *) fp;
391
392 while (clen--) {
393 *rtp++ = *rfp++;
394 }
395 } else {
396
397 /*
398 * copy 16 Byte chunks
399 */
400 clen = len >> 4;
401 tp = (unsigned short *) to;
402 fp = (unsigned short *) from;
403 while (clen--) {
404 *tp++ = *fp++;
405 *tp++ = *fp++;
406 *tp++ = *fp++;
407 *tp++ = *fp++;
408 *tp++ = *fp++;
409 *tp++ = *fp++;
410 *tp++ = *fp++;
411 *tp++ = *fp++;
412 fp += 8;
413 }
414
415 /*
416 * do the rest, if any.
417 */
418 clen = len & 15;
419 rtp = (unsigned char *) tp;
420 rfp = (unsigned char *) fp;
421 while (clen--) {
422 *rtp++ = *rfp++;
423 }
424
425
426 }
427
428 }
429
430 /* Setup the Lance Rx and Tx rings */
431 static void lance_init_ring(struct net_device *dev)
432 {
433 struct lance_private *lp = netdev_priv(dev);
434 volatile struct lance_init_block *ib;
435 int leptr;
436 int i;
437
438 ib = (struct lance_init_block *) (dev->mem_start);
439
440 /* Lock out other processes while setting up hardware */
441 netif_stop_queue(dev);
442 lp->rx_new = lp->tx_new = 0;
443 lp->rx_old = lp->tx_old = 0;
444
445 /* Copy the ethernet address to the lance init block.
446 * XXX bit 0 of the physical address registers has to be zero
447 */
448 ib->phys_addr[0] = dev->dev_addr[0];
449 ib->phys_addr[1] = dev->dev_addr[1];
450 ib->phys_addr[4] = dev->dev_addr[2];
451 ib->phys_addr[5] = dev->dev_addr[3];
452 ib->phys_addr[8] = dev->dev_addr[4];
453 ib->phys_addr[9] = dev->dev_addr[5];
454 /* Setup the initialization block */
455
456 /* Setup rx descriptor pointer */
457 leptr = LANCE_ADDR(libdesc_offset(brx_ring, 0));
458 ib->rx_len = (LANCE_LOG_RX_BUFFERS << 13) | (leptr >> 16);
459 ib->rx_ptr = leptr;
460 if (ZERO)
461 printk("RX ptr: %8.8x(%8.8x)\n", leptr, libdesc_offset(brx_ring, 0));
462
463 /* Setup tx descriptor pointer */
464 leptr = LANCE_ADDR(libdesc_offset(btx_ring, 0));
465 ib->tx_len = (LANCE_LOG_TX_BUFFERS << 13) | (leptr >> 16);
466 ib->tx_ptr = leptr;
467 if (ZERO)
468 printk("TX ptr: %8.8x(%8.8x)\n", leptr, libdesc_offset(btx_ring, 0));
469
470 if (ZERO)
471 printk("TX rings:\n");
472
473 /* Setup the Tx ring entries */
474 for (i = 0; i < TX_RING_SIZE; i++) {
475 leptr = (int) lp->tx_buf_ptr_lnc[i];
476 ib->btx_ring[i].tmd0 = leptr;
477 ib->btx_ring[i].tmd1_hadr = leptr >> 16;
478 ib->btx_ring[i].tmd1_bits = 0;
479 ib->btx_ring[i].length = 0xf000; /* The ones required by tmd2 */
480 ib->btx_ring[i].misc = 0;
481 if (i < 3 && ZERO)
482 printk("%d: 0x%8.8x(0x%8.8x)\n", i, leptr, (int) lp->tx_buf_ptr_cpu[i]);
483 }
484
485 /* Setup the Rx ring entries */
486 if (ZERO)
487 printk("RX rings:\n");
488 for (i = 0; i < RX_RING_SIZE; i++) {
489 leptr = (int) lp->rx_buf_ptr_lnc[i];
490 ib->brx_ring[i].rmd0 = leptr;
491 ib->brx_ring[i].rmd1_hadr = leptr >> 16;
492 ib->brx_ring[i].rmd1_bits = LE_R1_OWN;
493 ib->brx_ring[i].length = -RX_BUFF_SIZE | 0xf000;
494 ib->brx_ring[i].mblength = 0;
495 if (i < 3 && ZERO)
496 printk("%d: 0x%8.8x(0x%8.8x)\n", i, leptr, (int) lp->rx_buf_ptr_cpu[i]);
497 }
498 iob();
499 }
500
501 static int init_restart_lance(struct lance_private *lp)
502 {
503 volatile struct lance_regs *ll = lp->ll;
504 int i;
505
506 writereg(&ll->rap, LE_CSR0);
507 writereg(&ll->rdp, LE_C0_INIT);
508
509 /* Wait for the lance to complete initialization */
510 for (i = 0; (i < 100) && !(ll->rdp & LE_C0_IDON); i++) {
511 udelay(10);
512 }
513 if ((i == 100) || (ll->rdp & LE_C0_ERR)) {
514 printk("LANCE unopened after %d ticks, csr0=%4.4x.\n", i, ll->rdp);
515 return -1;
516 }
517 if ((ll->rdp & LE_C0_ERR)) {
518 printk("LANCE unopened after %d ticks, csr0=%4.4x.\n", i, ll->rdp);
519 return -1;
520 }
521 writereg(&ll->rdp, LE_C0_IDON);
522 writereg(&ll->rdp, LE_C0_STRT);
523 writereg(&ll->rdp, LE_C0_INEA);
524
525 return 0;
526 }
527
528 static int lance_rx(struct net_device *dev)
529 {
530 struct lance_private *lp = netdev_priv(dev);
531 volatile struct lance_init_block *ib;
532 volatile struct lance_rx_desc *rd = 0;
533 unsigned char bits;
534 int len = 0;
535 struct sk_buff *skb = 0;
536 ib = (struct lance_init_block *) (dev->mem_start);
537
538 #ifdef TEST_HITS
539 {
540 int i;
541
542 printk("[");
543 for (i = 0; i < RX_RING_SIZE; i++) {
544 if (i == lp->rx_new)
545 printk("%s", ib->brx_ring[i].rmd1_bits &
546 LE_R1_OWN ? "_" : "X");
547 else
548 printk("%s", ib->brx_ring[i].rmd1_bits &
549 LE_R1_OWN ? "." : "1");
550 }
551 printk("]");
552 }
553 #endif
554
555 for (rd = &ib->brx_ring[lp->rx_new];
556 !((bits = rd->rmd1_bits) & LE_R1_OWN);
557 rd = &ib->brx_ring[lp->rx_new]) {
558
559 /* We got an incomplete frame? */
560 if ((bits & LE_R1_POK) != LE_R1_POK) {
561 lp->stats.rx_over_errors++;
562 lp->stats.rx_errors++;
563 } else if (bits & LE_R1_ERR) {
564 /* Count only the end frame as a rx error,
565 * not the beginning
566 */
567 if (bits & LE_R1_BUF)
568 lp->stats.rx_fifo_errors++;
569 if (bits & LE_R1_CRC)
570 lp->stats.rx_crc_errors++;
571 if (bits & LE_R1_OFL)
572 lp->stats.rx_over_errors++;
573 if (bits & LE_R1_FRA)
574 lp->stats.rx_frame_errors++;
575 if (bits & LE_R1_EOP)
576 lp->stats.rx_errors++;
577 } else {
578 len = (rd->mblength & 0xfff) - 4;
579 skb = dev_alloc_skb(len + 2);
580
581 if (skb == 0) {
582 printk("%s: Memory squeeze, deferring packet.\n",
583 dev->name);
584 lp->stats.rx_dropped++;
585 rd->mblength = 0;
586 rd->rmd1_bits = LE_R1_OWN;
587 lp->rx_new = (lp->rx_new + 1) & RX_RING_MOD_MASK;
588 return 0;
589 }
590 lp->stats.rx_bytes += len;
591
592 skb->dev = dev;
593 skb_reserve(skb, 2); /* 16 byte align */
594 skb_put(skb, len); /* make room */
595
596 cp_from_buf(lp->type, skb->data,
597 (char *)lp->rx_buf_ptr_cpu[lp->rx_new],
598 len);
599
600 skb->protocol = eth_type_trans(skb, dev);
601 netif_rx(skb);
602 dev->last_rx = jiffies;
603 lp->stats.rx_packets++;
604 }
605
606 /* Return the packet to the pool */
607 rd->mblength = 0;
608 rd->length = -RX_BUFF_SIZE | 0xf000;
609 rd->rmd1_bits = LE_R1_OWN;
610 lp->rx_new = (lp->rx_new + 1) & RX_RING_MOD_MASK;
611 }
612 return 0;
613 }
614
615 static void lance_tx(struct net_device *dev)
616 {
617 struct lance_private *lp = netdev_priv(dev);
618 volatile struct lance_init_block *ib;
619 volatile struct lance_regs *ll = lp->ll;
620 volatile struct lance_tx_desc *td;
621 int i, j;
622 int status;
623 ib = (struct lance_init_block *) (dev->mem_start);
624 j = lp->tx_old;
625
626 spin_lock(&lp->lock);
627
628 for (i = j; i != lp->tx_new; i = j) {
629 td = &ib->btx_ring[i];
630 /* If we hit a packet not owned by us, stop */
631 if (td->tmd1_bits & LE_T1_OWN)
632 break;
633
634 if (td->tmd1_bits & LE_T1_ERR) {
635 status = td->misc;
636
637 lp->stats.tx_errors++;
638 if (status & LE_T3_RTY)
639 lp->stats.tx_aborted_errors++;
640 if (status & LE_T3_LCOL)
641 lp->stats.tx_window_errors++;
642
643 if (status & LE_T3_CLOS) {
644 lp->stats.tx_carrier_errors++;
645 printk("%s: Carrier Lost\n", dev->name);
646 /* Stop the lance */
647 writereg(&ll->rap, LE_CSR0);
648 writereg(&ll->rdp, LE_C0_STOP);
649 lance_init_ring(dev);
650 load_csrs(lp);
651 init_restart_lance(lp);
652 goto out;
653 }
654 /* Buffer errors and underflows turn off the
655 * transmitter, restart the adapter.
656 */
657 if (status & (LE_T3_BUF | LE_T3_UFL)) {
658 lp->stats.tx_fifo_errors++;
659
660 printk("%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
661 dev->name);
662 /* Stop the lance */
663 writereg(&ll->rap, LE_CSR0);
664 writereg(&ll->rdp, LE_C0_STOP);
665 lance_init_ring(dev);
666 load_csrs(lp);
667 init_restart_lance(lp);
668 goto out;
669 }
670 } else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
671 /*
672 * So we don't count the packet more than once.
673 */
674 td->tmd1_bits &= ~(LE_T1_POK);
675
676 /* One collision before packet was sent. */
677 if (td->tmd1_bits & LE_T1_EONE)
678 lp->stats.collisions++;
679
680 /* More than one collision, be optimistic. */
681 if (td->tmd1_bits & LE_T1_EMORE)
682 lp->stats.collisions += 2;
683
684 lp->stats.tx_packets++;
685 }
686 j = (j + 1) & TX_RING_MOD_MASK;
687 }
688 lp->tx_old = j;
689 out:
690 if (netif_queue_stopped(dev) &&
691 TX_BUFFS_AVAIL > 0)
692 netif_wake_queue(dev);
693
694 spin_unlock(&lp->lock);
695 }
696
697 static irqreturn_t lance_dma_merr_int(const int irq, void *dev_id)
698 {
699 struct net_device *dev = dev_id;
700
701 printk("%s: DMA error\n", dev->name);
702 return IRQ_HANDLED;
703 }
704
705 static irqreturn_t lance_interrupt(const int irq, void *dev_id)
706 {
707 struct net_device *dev = dev_id;
708 struct lance_private *lp = netdev_priv(dev);
709 volatile struct lance_regs *ll = lp->ll;
710 int csr0;
711
712 writereg(&ll->rap, LE_CSR0);
713 csr0 = ll->rdp;
714
715 /* Acknowledge all the interrupt sources ASAP */
716 writereg(&ll->rdp, csr0 & (LE_C0_INTR | LE_C0_TINT | LE_C0_RINT));
717
718 if ((csr0 & LE_C0_ERR)) {
719 /* Clear the error condition */
720 writereg(&ll->rdp, LE_C0_BABL | LE_C0_ERR | LE_C0_MISS |
721 LE_C0_CERR | LE_C0_MERR);
722 }
723 if (csr0 & LE_C0_RINT)
724 lance_rx(dev);
725
726 if (csr0 & LE_C0_TINT)
727 lance_tx(dev);
728
729 if (csr0 & LE_C0_BABL)
730 lp->stats.tx_errors++;
731
732 if (csr0 & LE_C0_MISS)
733 lp->stats.rx_errors++;
734
735 if (csr0 & LE_C0_MERR) {
736 printk("%s: Memory error, status %04x\n", dev->name, csr0);
737
738 writereg(&ll->rdp, LE_C0_STOP);
739
740 lance_init_ring(dev);
741 load_csrs(lp);
742 init_restart_lance(lp);
743 netif_wake_queue(dev);
744 }
745
746 writereg(&ll->rdp, LE_C0_INEA);
747 writereg(&ll->rdp, LE_C0_INEA);
748 return IRQ_HANDLED;
749 }
750
751 struct net_device *last_dev = 0;
752
753 static int lance_open(struct net_device *dev)
754 {
755 volatile struct lance_init_block *ib = (struct lance_init_block *) (dev->mem_start);
756 struct lance_private *lp = netdev_priv(dev);
757 volatile struct lance_regs *ll = lp->ll;
758 int status = 0;
759
760 last_dev = dev;
761
762 /* Stop the Lance */
763 writereg(&ll->rap, LE_CSR0);
764 writereg(&ll->rdp, LE_C0_STOP);
765
766 /* Set mode and clear multicast filter only at device open,
767 * so that lance_init_ring() called at any error will not
768 * forget multicast filters.
769 *
770 * BTW it is common bug in all lance drivers! --ANK
771 */
772 ib->mode = 0;
773 ib->filter [0] = 0;
774 ib->filter [2] = 0;
775 ib->filter [4] = 0;
776 ib->filter [6] = 0;
777
778 lance_init_ring(dev);
779 load_csrs(lp);
780
781 netif_start_queue(dev);
782
783 /* Associate IRQ with lance_interrupt */
784 if (request_irq(dev->irq, &lance_interrupt, 0, "lance", dev)) {
785 printk("%s: Can't get IRQ %d\n", dev->name, dev->irq);
786 return -EAGAIN;
787 }
788 if (lp->dma_irq >= 0) {
789 unsigned long flags;
790
791 if (request_irq(lp->dma_irq, &lance_dma_merr_int, 0,
792 "lance error", dev)) {
793 free_irq(dev->irq, dev);
794 printk("%s: Can't get DMA IRQ %d\n", dev->name,
795 lp->dma_irq);
796 return -EAGAIN;
797 }
798
799 spin_lock_irqsave(&ioasic_ssr_lock, flags);
800
801 fast_mb();
802 /* Enable I/O ASIC LANCE DMA. */
803 ioasic_write(IO_REG_SSR,
804 ioasic_read(IO_REG_SSR) | IO_SSR_LANCE_DMA_EN);
805
806 fast_mb();
807 spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
808 }
809
810 status = init_restart_lance(lp);
811 return status;
812 }
813
814 static int lance_close(struct net_device *dev)
815 {
816 struct lance_private *lp = netdev_priv(dev);
817 volatile struct lance_regs *ll = lp->ll;
818
819 netif_stop_queue(dev);
820 del_timer_sync(&lp->multicast_timer);
821
822 /* Stop the card */
823 writereg(&ll->rap, LE_CSR0);
824 writereg(&ll->rdp, LE_C0_STOP);
825
826 if (lp->dma_irq >= 0) {
827 unsigned long flags;
828
829 spin_lock_irqsave(&ioasic_ssr_lock, flags);
830
831 fast_mb();
832 /* Disable I/O ASIC LANCE DMA. */
833 ioasic_write(IO_REG_SSR,
834 ioasic_read(IO_REG_SSR) & ~IO_SSR_LANCE_DMA_EN);
835
836 fast_iob();
837 spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
838
839 free_irq(lp->dma_irq, dev);
840 }
841 free_irq(dev->irq, dev);
842 return 0;
843 }
844
845 static inline int lance_reset(struct net_device *dev)
846 {
847 struct lance_private *lp = netdev_priv(dev);
848 volatile struct lance_regs *ll = lp->ll;
849 int status;
850
851 /* Stop the lance */
852 writereg(&ll->rap, LE_CSR0);
853 writereg(&ll->rdp, LE_C0_STOP);
854
855 lance_init_ring(dev);
856 load_csrs(lp);
857 dev->trans_start = jiffies;
858 status = init_restart_lance(lp);
859 return status;
860 }
861
862 static void lance_tx_timeout(struct net_device *dev)
863 {
864 struct lance_private *lp = netdev_priv(dev);
865 volatile struct lance_regs *ll = lp->ll;
866
867 printk(KERN_ERR "%s: transmit timed out, status %04x, reset\n",
868 dev->name, ll->rdp);
869 lance_reset(dev);
870 netif_wake_queue(dev);
871 }
872
873 static int lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
874 {
875 struct lance_private *lp = netdev_priv(dev);
876 volatile struct lance_regs *ll = lp->ll;
877 volatile struct lance_init_block *ib = (struct lance_init_block *) (dev->mem_start);
878 int entry, skblen, len;
879
880 skblen = skb->len;
881
882 len = skblen;
883
884 if (len < ETH_ZLEN) {
885 if (skb_padto(skb, ETH_ZLEN))
886 return 0;
887 len = ETH_ZLEN;
888 }
889
890 lp->stats.tx_bytes += len;
891
892 entry = lp->tx_new & TX_RING_MOD_MASK;
893 ib->btx_ring[entry].length = (-len);
894 ib->btx_ring[entry].misc = 0;
895
896 cp_to_buf(lp->type, (char *)lp->tx_buf_ptr_cpu[entry], skb->data,
897 skblen);
898
899 /* Clear the slack of the packet, do I need this? */
900 /* For a firewall it's a good idea - AC */
901 /*
902 if (len != skblen)
903 memset ((char *) &ib->tx_buf [entry][skblen], 0, (len - skblen) << 1);
904 */
905
906 /* Now, give the packet to the lance */
907 ib->btx_ring[entry].tmd1_bits = (LE_T1_POK | LE_T1_OWN);
908 lp->tx_new = (lp->tx_new + 1) & TX_RING_MOD_MASK;
909
910 if (TX_BUFFS_AVAIL <= 0)
911 netif_stop_queue(dev);
912
913 /* Kick the lance: transmit now */
914 writereg(&ll->rdp, LE_C0_INEA | LE_C0_TDMD);
915
916 spin_unlock_irq(&lp->lock);
917
918 dev->trans_start = jiffies;
919 dev_kfree_skb(skb);
920
921 return 0;
922 }
923
924 static struct net_device_stats *lance_get_stats(struct net_device *dev)
925 {
926 struct lance_private *lp = netdev_priv(dev);
927
928 return &lp->stats;
929 }
930
931 static void lance_load_multicast(struct net_device *dev)
932 {
933 volatile struct lance_init_block *ib = (struct lance_init_block *) (dev->mem_start);
934 volatile u16 *mcast_table = (u16 *) & ib->filter;
935 struct dev_mc_list *dmi = dev->mc_list;
936 char *addrs;
937 int i;
938 u32 crc;
939
940 /* set all multicast bits */
941 if (dev->flags & IFF_ALLMULTI) {
942 ib->filter[0] = 0xffff;
943 ib->filter[2] = 0xffff;
944 ib->filter[4] = 0xffff;
945 ib->filter[6] = 0xffff;
946 return;
947 }
948 /* clear the multicast filter */
949 ib->filter[0] = 0;
950 ib->filter[2] = 0;
951 ib->filter[4] = 0;
952 ib->filter[6] = 0;
953
954 /* Add addresses */
955 for (i = 0; i < dev->mc_count; i++) {
956 addrs = dmi->dmi_addr;
957 dmi = dmi->next;
958
959 /* multicast address? */
960 if (!(*addrs & 1))
961 continue;
962
963 crc = ether_crc_le(ETH_ALEN, addrs);
964 crc = crc >> 26;
965 mcast_table[2 * (crc >> 4)] |= 1 << (crc & 0xf);
966 }
967 return;
968 }
969
970 static void lance_set_multicast(struct net_device *dev)
971 {
972 struct lance_private *lp = netdev_priv(dev);
973 volatile struct lance_init_block *ib;
974 volatile struct lance_regs *ll = lp->ll;
975
976 ib = (struct lance_init_block *) (dev->mem_start);
977
978 if (!netif_running(dev))
979 return;
980
981 if (lp->tx_old != lp->tx_new) {
982 mod_timer(&lp->multicast_timer, jiffies + 4 * HZ/100);
983 netif_wake_queue(dev);
984 return;
985 }
986
987 netif_stop_queue(dev);
988
989 writereg(&ll->rap, LE_CSR0);
990 writereg(&ll->rdp, LE_C0_STOP);
991
992 lance_init_ring(dev);
993
994 if (dev->flags & IFF_PROMISC) {
995 ib->mode |= LE_MO_PROM;
996 } else {
997 ib->mode &= ~LE_MO_PROM;
998 lance_load_multicast(dev);
999 }
1000 load_csrs(lp);
1001 init_restart_lance(lp);
1002 netif_wake_queue(dev);
1003 }
1004
1005 static void lance_set_multicast_retry(unsigned long _opaque)
1006 {
1007 struct net_device *dev = (struct net_device *) _opaque;
1008
1009 lance_set_multicast(dev);
1010 }
1011
1012 static int __init dec_lance_init(const int type, const int slot)
1013 {
1014 static unsigned version_printed;
1015 static const char fmt[] = "declance%d";
1016 char name[10];
1017 struct net_device *dev;
1018 struct lance_private *lp;
1019 volatile struct lance_regs *ll;
1020 int i, ret;
1021 unsigned long esar_base;
1022 unsigned char *esar;
1023
1024 if (dec_lance_debug && version_printed++ == 0)
1025 printk(version);
1026
1027 i = 0;
1028 dev = root_lance_dev;
1029 while (dev) {
1030 i++;
1031 lp = (struct lance_private *)dev->priv;
1032 dev = lp->next;
1033 }
1034 snprintf(name, sizeof(name), fmt, i);
1035
1036 dev = alloc_etherdev(sizeof(struct lance_private));
1037 if (!dev) {
1038 printk(KERN_ERR "%s: Unable to allocate etherdev, aborting.\n",
1039 name);
1040 ret = -ENOMEM;
1041 goto err_out;
1042 }
1043
1044 /*
1045 * alloc_etherdev ensures the data structures used by the LANCE
1046 * are aligned.
1047 */
1048 lp = netdev_priv(dev);
1049 spin_lock_init(&lp->lock);
1050
1051 lp->type = type;
1052 lp->slot = slot;
1053 switch (type) {
1054 #ifdef CONFIG_TC
1055 case ASIC_LANCE:
1056 dev->base_addr = CKSEG1ADDR(dec_kn_slot_base + IOASIC_LANCE);
1057
1058 /* buffer space for the on-board LANCE shared memory */
1059 /*
1060 * FIXME: ugly hack!
1061 */
1062 dev->mem_start = CKSEG1ADDR(0x00020000);
1063 dev->mem_end = dev->mem_start + 0x00020000;
1064 dev->irq = dec_interrupt[DEC_IRQ_LANCE];
1065 esar_base = CKSEG1ADDR(dec_kn_slot_base + IOASIC_ESAR);
1066
1067 /* Workaround crash with booting KN04 2.1k from Disk */
1068 memset((void *)dev->mem_start, 0,
1069 dev->mem_end - dev->mem_start);
1070
1071 /*
1072 * setup the pointer arrays, this sucks [tm] :-(
1073 */
1074 for (i = 0; i < RX_RING_SIZE; i++) {
1075 lp->rx_buf_ptr_cpu[i] =
1076 (char *)(dev->mem_start + BUF_OFFSET_CPU +
1077 2 * i * RX_BUFF_SIZE);
1078 lp->rx_buf_ptr_lnc[i] =
1079 (char *)(BUF_OFFSET_LNC + i * RX_BUFF_SIZE);
1080 }
1081 for (i = 0; i < TX_RING_SIZE; i++) {
1082 lp->tx_buf_ptr_cpu[i] =
1083 (char *)(dev->mem_start + BUF_OFFSET_CPU +
1084 2 * RX_RING_SIZE * RX_BUFF_SIZE +
1085 2 * i * TX_BUFF_SIZE);
1086 lp->tx_buf_ptr_lnc[i] =
1087 (char *)(BUF_OFFSET_LNC +
1088 RX_RING_SIZE * RX_BUFF_SIZE +
1089 i * TX_BUFF_SIZE);
1090 }
1091
1092 /* Setup I/O ASIC LANCE DMA. */
1093 lp->dma_irq = dec_interrupt[DEC_IRQ_LANCE_MERR];
1094 ioasic_write(IO_REG_LANCE_DMA_P,
1095 CPHYSADDR(dev->mem_start) << 3);
1096
1097 break;
1098
1099 case PMAD_LANCE:
1100 claim_tc_card(slot);
1101
1102 dev->mem_start = CKSEG1ADDR(get_tc_base_addr(slot));
1103 dev->base_addr = dev->mem_start + 0x100000;
1104 dev->irq = get_tc_irq_nr(slot);
1105 esar_base = dev->mem_start + 0x1c0002;
1106 lp->dma_irq = -1;
1107
1108 for (i = 0; i < RX_RING_SIZE; i++) {
1109 lp->rx_buf_ptr_cpu[i] =
1110 (char *)(dev->mem_start + BUF_OFFSET_CPU +
1111 i * RX_BUFF_SIZE);
1112 lp->rx_buf_ptr_lnc[i] =
1113 (char *)(BUF_OFFSET_LNC + i * RX_BUFF_SIZE);
1114 }
1115 for (i = 0; i < TX_RING_SIZE; i++) {
1116 lp->tx_buf_ptr_cpu[i] =
1117 (char *)(dev->mem_start + BUF_OFFSET_CPU +
1118 RX_RING_SIZE * RX_BUFF_SIZE +
1119 i * TX_BUFF_SIZE);
1120 lp->tx_buf_ptr_lnc[i] =
1121 (char *)(BUF_OFFSET_LNC +
1122 RX_RING_SIZE * RX_BUFF_SIZE +
1123 i * TX_BUFF_SIZE);
1124 }
1125
1126 break;
1127 #endif
1128
1129 case PMAX_LANCE:
1130 dev->irq = dec_interrupt[DEC_IRQ_LANCE];
1131 dev->base_addr = CKSEG1ADDR(KN01_SLOT_BASE + KN01_LANCE);
1132 dev->mem_start = CKSEG1ADDR(KN01_SLOT_BASE + KN01_LANCE_MEM);
1133 esar_base = CKSEG1ADDR(KN01_SLOT_BASE + KN01_ESAR + 1);
1134 lp->dma_irq = -1;
1135
1136 /*
1137 * setup the pointer arrays, this sucks [tm] :-(
1138 */
1139 for (i = 0; i < RX_RING_SIZE; i++) {
1140 lp->rx_buf_ptr_cpu[i] =
1141 (char *)(dev->mem_start + BUF_OFFSET_CPU +
1142 2 * i * RX_BUFF_SIZE);
1143 lp->rx_buf_ptr_lnc[i] =
1144 (char *)(BUF_OFFSET_LNC + i * RX_BUFF_SIZE);
1145 }
1146 for (i = 0; i < TX_RING_SIZE; i++) {
1147 lp->tx_buf_ptr_cpu[i] =
1148 (char *)(dev->mem_start + BUF_OFFSET_CPU +
1149 2 * RX_RING_SIZE * RX_BUFF_SIZE +
1150 2 * i * TX_BUFF_SIZE);
1151 lp->tx_buf_ptr_lnc[i] =
1152 (char *)(BUF_OFFSET_LNC +
1153 RX_RING_SIZE * RX_BUFF_SIZE +
1154 i * TX_BUFF_SIZE);
1155 }
1156
1157 break;
1158
1159 default:
1160 printk(KERN_ERR "%s: declance_init called with unknown type\n",
1161 name);
1162 ret = -ENODEV;
1163 goto err_out_free_dev;
1164 }
1165
1166 ll = (struct lance_regs *) dev->base_addr;
1167 esar = (unsigned char *) esar_base;
1168
1169 /* prom checks */
1170 /* First, check for test pattern */
1171 if (esar[0x60] != 0xff && esar[0x64] != 0x00 &&
1172 esar[0x68] != 0x55 && esar[0x6c] != 0xaa) {
1173 printk(KERN_ERR
1174 "%s: Ethernet station address prom not found!\n",
1175 name);
1176 ret = -ENODEV;
1177 goto err_out_free_dev;
1178 }
1179 /* Check the prom contents */
1180 for (i = 0; i < 8; i++) {
1181 if (esar[i * 4] != esar[0x3c - i * 4] &&
1182 esar[i * 4] != esar[0x40 + i * 4] &&
1183 esar[0x3c - i * 4] != esar[0x40 + i * 4]) {
1184 printk(KERN_ERR "%s: Something is wrong with the "
1185 "ethernet station address prom!\n", name);
1186 ret = -ENODEV;
1187 goto err_out_free_dev;
1188 }
1189 }
1190
1191 /* Copy the ethernet address to the device structure, later to the
1192 * lance initialization block so the lance gets it every time it's
1193 * (re)initialized.
1194 */
1195 switch (type) {
1196 case ASIC_LANCE:
1197 printk("%s: IOASIC onboard LANCE, addr = ", name);
1198 break;
1199 case PMAD_LANCE:
1200 printk("%s: PMAD-AA, addr = ", name);
1201 break;
1202 case PMAX_LANCE:
1203 printk("%s: PMAX onboard LANCE, addr = ", name);
1204 break;
1205 }
1206 for (i = 0; i < 6; i++) {
1207 dev->dev_addr[i] = esar[i * 4];
1208 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? ',' : ':');
1209 }
1210
1211 printk(" irq = %d\n", dev->irq);
1212
1213 dev->open = &lance_open;
1214 dev->stop = &lance_close;
1215 dev->hard_start_xmit = &lance_start_xmit;
1216 dev->tx_timeout = &lance_tx_timeout;
1217 dev->watchdog_timeo = 5*HZ;
1218 dev->get_stats = &lance_get_stats;
1219 dev->set_multicast_list = &lance_set_multicast;
1220
1221 /* lp->ll is the location of the registers for lance card */
1222 lp->ll = ll;
1223
1224 /* busmaster_regval (CSR3) should be zero according to the PMAD-AA
1225 * specification.
1226 */
1227 lp->busmaster_regval = 0;
1228
1229 dev->dma = 0;
1230
1231 /* We cannot sleep if the chip is busy during a
1232 * multicast list update event, because such events
1233 * can occur from interrupts (ex. IPv6). So we
1234 * use a timer to try again later when necessary. -DaveM
1235 */
1236 init_timer(&lp->multicast_timer);
1237 lp->multicast_timer.data = (unsigned long) dev;
1238 lp->multicast_timer.function = &lance_set_multicast_retry;
1239
1240 ret = register_netdev(dev);
1241 if (ret) {
1242 printk(KERN_ERR
1243 "%s: Unable to register netdev, aborting.\n", name);
1244 goto err_out_free_dev;
1245 }
1246
1247 lp->next = root_lance_dev;
1248 root_lance_dev = dev;
1249
1250 printk("%s: registered as %s.\n", name, dev->name);
1251 return 0;
1252
1253 err_out_free_dev:
1254 free_netdev(dev);
1255
1256 err_out:
1257 return ret;
1258 }
1259
1260
1261 /* Find all the lance cards on the system and initialize them */
1262 static int __init dec_lance_probe(void)
1263 {
1264 int count = 0;
1265
1266 /* Scan slots for PMAD-AA cards first. */
1267 #ifdef CONFIG_TC
1268 if (TURBOCHANNEL) {
1269 int slot;
1270
1271 while ((slot = search_tc_card("PMAD-AA")) >= 0) {
1272 if (dec_lance_init(PMAD_LANCE, slot) < 0)
1273 break;
1274 count++;
1275 }
1276 }
1277 #endif
1278
1279 /* Then handle onboard devices. */
1280 if (dec_interrupt[DEC_IRQ_LANCE] >= 0) {
1281 if (dec_interrupt[DEC_IRQ_LANCE_MERR] >= 0) {
1282 #ifdef CONFIG_TC
1283 if (dec_lance_init(ASIC_LANCE, -1) >= 0)
1284 count++;
1285 #endif
1286 } else if (!TURBOCHANNEL) {
1287 if (dec_lance_init(PMAX_LANCE, -1) >= 0)
1288 count++;
1289 }
1290 }
1291
1292 return (count > 0) ? 0 : -ENODEV;
1293 }
1294
1295 static void __exit dec_lance_cleanup(void)
1296 {
1297 while (root_lance_dev) {
1298 struct net_device *dev = root_lance_dev;
1299 struct lance_private *lp = netdev_priv(dev);
1300
1301 unregister_netdev(dev);
1302 #ifdef CONFIG_TC
1303 if (lp->slot >= 0)
1304 release_tc_card(lp->slot);
1305 #endif
1306 root_lance_dev = lp->next;
1307 free_netdev(dev);
1308 }
1309 }
1310
1311 module_init(dec_lance_probe);
1312 module_exit(dec_lance_cleanup);
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