xref: /linux/drivers/net/ethernet/amd/7990.c (revision 0f69403d2535ffc7200a8414cf3ca66a49b0d741) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * 7990.c -- LANCE ethernet IC generic routines.
4  * This is an attempt to separate out the bits of various ethernet
5  * drivers that are common because they all use the AMD 7990 LANCE
6  * (Local Area Network Controller for Ethernet) chip.
7  *
8  * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
9  *
10  * Most of this stuff was obtained by looking at other LANCE drivers,
11  * in particular a2065.[ch]. The AMD C-LANCE datasheet was also helpful.
12  * NB: this was made easy by the fact that Jes Sorensen had cleaned up
13  * most of a2025 and sunlance with the aim of merging them, so the
14  * common code was pretty obvious.
15  */
16 #include <linux/crc32.h>
17 #include <linux/delay.h>
18 #include <linux/errno.h>
19 #include <linux/netdevice.h>
20 #include <linux/etherdevice.h>
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/types.h>
24 #include <linux/fcntl.h>
25 #include <linux/interrupt.h>
26 #include <linux/ioport.h>
27 #include <linux/in.h>
28 #include <linux/route.h>
29 #include <linux/string.h>
30 #include <linux/skbuff.h>
31 #include <linux/pgtable.h>
32 #include <asm/irq.h>
33 /* Used for the temporal inet entries and routing */
34 #include <linux/socket.h>
35 #include <linux/bitops.h>
36 
37 #include <asm/io.h>
38 #include <asm/dma.h>
39 #ifdef CONFIG_HP300
40 #include <asm/blinken.h>
41 #endif
42 
43 #include "7990.h"
44 
45 #define WRITERAP(lp, x)	out_be16(lp->base + LANCE_RAP, (x))
46 #define WRITERDP(lp, x)	out_be16(lp->base + LANCE_RDP, (x))
47 #define READRDP(lp)	in_be16(lp->base + LANCE_RDP)
48 
49 #if IS_ENABLED(CONFIG_HPLANCE)
50 #include "hplance.h"
51 
52 #undef WRITERAP
53 #undef WRITERDP
54 #undef READRDP
55 
56 #if IS_ENABLED(CONFIG_MVME147_NET)
57 
58 /* Lossage Factor Nine, Mr Sulu. */
59 #define WRITERAP(lp, x)	(lp->writerap(lp, x))
60 #define WRITERDP(lp, x)	(lp->writerdp(lp, x))
61 #define READRDP(lp)	(lp->readrdp(lp))
62 
63 #else
64 
65 /* These inlines can be used if only CONFIG_HPLANCE is defined */
66 static inline void WRITERAP(struct lance_private *lp, __u16 value)
67 {
68 	do {
69 		out_be16(lp->base + HPLANCE_REGOFF + LANCE_RAP, value);
70 	} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
71 }
72 
73 static inline void WRITERDP(struct lance_private *lp, __u16 value)
74 {
75 	do {
76 		out_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP, value);
77 	} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
78 }
79 
80 static inline __u16 READRDP(struct lance_private *lp)
81 {
82 	__u16 value;
83 	do {
84 		value = in_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP);
85 	} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
86 	return value;
87 }
88 
89 #endif
90 #endif /* IS_ENABLED(CONFIG_HPLANCE) */
91 
92 /* debugging output macros, various flavours */
93 /* #define TEST_HITS */
94 #ifdef UNDEF
95 #define PRINT_RINGS() \
96 do { \
97 	int t; \
98 	for (t = 0; t < RX_RING_SIZE; t++) { \
99 		printk("R%d: @(%02X %04X) len %04X, mblen %04X, bits %02X\n", \
100 		       t, ib->brx_ring[t].rmd1_hadr, ib->brx_ring[t].rmd0, \
101 		       ib->brx_ring[t].length, \
102 		       ib->brx_ring[t].mblength, ib->brx_ring[t].rmd1_bits); \
103 	} \
104 	for (t = 0; t < TX_RING_SIZE; t++) { \
105 		printk("T%d: @(%02X %04X) len %04X, misc %04X, bits %02X\n", \
106 		       t, ib->btx_ring[t].tmd1_hadr, ib->btx_ring[t].tmd0, \
107 		       ib->btx_ring[t].length, \
108 		       ib->btx_ring[t].misc, ib->btx_ring[t].tmd1_bits); \
109 	} \
110 } while (0)
111 #else
112 #define PRINT_RINGS()
113 #endif
114 
115 /* Load the CSR registers. The LANCE has to be STOPped when we do this! */
116 static void load_csrs(struct lance_private *lp)
117 {
118 	volatile struct lance_init_block *aib = lp->lance_init_block;
119 	int leptr;
120 
121 	leptr = LANCE_ADDR(aib);
122 
123 	WRITERAP(lp, LE_CSR1);                    /* load address of init block */
124 	WRITERDP(lp, leptr & 0xFFFF);
125 	WRITERAP(lp, LE_CSR2);
126 	WRITERDP(lp, leptr >> 16);
127 	WRITERAP(lp, LE_CSR3);
128 	WRITERDP(lp, lp->busmaster_regval);       /* set byteswap/ALEctrl/byte ctrl */
129 
130 	/* Point back to csr0 */
131 	WRITERAP(lp, LE_CSR0);
132 }
133 
134 /* #define to 0 or 1 appropriately */
135 #define DEBUG_IRING 0
136 /* Set up the Lance Rx and Tx rings and the init block */
137 static void lance_init_ring(struct net_device *dev)
138 {
139 	struct lance_private *lp = netdev_priv(dev);
140 	volatile struct lance_init_block *ib = lp->init_block;
141 	volatile struct lance_init_block *aib; /* for LANCE_ADDR computations */
142 	int leptr;
143 	int i;
144 
145 	aib = lp->lance_init_block;
146 
147 	lp->rx_new = lp->tx_new = 0;
148 	lp->rx_old = lp->tx_old = 0;
149 
150 	ib->mode = LE_MO_PROM;                             /* normal, enable Tx & Rx */
151 
152 	/* Copy the ethernet address to the lance init block
153 	 * Notice that we do a byteswap if we're big endian.
154 	 * [I think this is the right criterion; at least, sunlance,
155 	 * a2065 and atarilance do the byteswap and lance.c (PC) doesn't.
156 	 * However, the datasheet says that the BSWAP bit doesn't affect
157 	 * the init block, so surely it should be low byte first for
158 	 * everybody? Um.]
159 	 * We could define the ib->physaddr as three 16bit values and
160 	 * use (addr[1] << 8) | addr[0] & co, but this is more efficient.
161 	 */
162 #ifdef __BIG_ENDIAN
163 	ib->phys_addr[0] = dev->dev_addr[1];
164 	ib->phys_addr[1] = dev->dev_addr[0];
165 	ib->phys_addr[2] = dev->dev_addr[3];
166 	ib->phys_addr[3] = dev->dev_addr[2];
167 	ib->phys_addr[4] = dev->dev_addr[5];
168 	ib->phys_addr[5] = dev->dev_addr[4];
169 #else
170 	for (i = 0; i < 6; i++)
171 	       ib->phys_addr[i] = dev->dev_addr[i];
172 #endif
173 
174 	if (DEBUG_IRING)
175 		printk("TX rings:\n");
176 
177 	lp->tx_full = 0;
178 	/* Setup the Tx ring entries */
179 	for (i = 0; i < (1 << lp->lance_log_tx_bufs); i++) {
180 		leptr = LANCE_ADDR(&aib->tx_buf[i][0]);
181 		ib->btx_ring[i].tmd0      = leptr;
182 		ib->btx_ring[i].tmd1_hadr = leptr >> 16;
183 		ib->btx_ring[i].tmd1_bits = 0;
184 		ib->btx_ring[i].length    = 0xf000; /* The ones required by tmd2 */
185 		ib->btx_ring[i].misc      = 0;
186 		if (DEBUG_IRING)
187 			printk("%d: 0x%8.8x\n", i, leptr);
188 	}
189 
190 	/* Setup the Rx ring entries */
191 	if (DEBUG_IRING)
192 		printk("RX rings:\n");
193 	for (i = 0; i < (1 << lp->lance_log_rx_bufs); i++) {
194 		leptr = LANCE_ADDR(&aib->rx_buf[i][0]);
195 
196 		ib->brx_ring[i].rmd0      = leptr;
197 		ib->brx_ring[i].rmd1_hadr = leptr >> 16;
198 		ib->brx_ring[i].rmd1_bits = LE_R1_OWN;
199 		/* 0xf000 == bits that must be one (reserved, presumably) */
200 		ib->brx_ring[i].length    = -RX_BUFF_SIZE | 0xf000;
201 		ib->brx_ring[i].mblength  = 0;
202 		if (DEBUG_IRING)
203 			printk("%d: 0x%8.8x\n", i, leptr);
204 	}
205 
206 	/* Setup the initialization block */
207 
208 	/* Setup rx descriptor pointer */
209 	leptr = LANCE_ADDR(&aib->brx_ring);
210 	ib->rx_len = (lp->lance_log_rx_bufs << 13) | (leptr >> 16);
211 	ib->rx_ptr = leptr;
212 	if (DEBUG_IRING)
213 		printk("RX ptr: %8.8x\n", leptr);
214 
215 	/* Setup tx descriptor pointer */
216 	leptr = LANCE_ADDR(&aib->btx_ring);
217 	ib->tx_len = (lp->lance_log_tx_bufs << 13) | (leptr >> 16);
218 	ib->tx_ptr = leptr;
219 	if (DEBUG_IRING)
220 		printk("TX ptr: %8.8x\n", leptr);
221 
222 	/* Clear the multicast filter */
223 	ib->filter[0] = 0;
224 	ib->filter[1] = 0;
225 	PRINT_RINGS();
226 }
227 
228 /* LANCE must be STOPped before we do this, too... */
229 static int init_restart_lance(struct lance_private *lp)
230 {
231 	int i;
232 
233 	WRITERAP(lp, LE_CSR0);
234 	WRITERDP(lp, LE_C0_INIT);
235 
236 	/* Need a hook here for sunlance ledma stuff */
237 
238 	/* Wait for the lance to complete initialization */
239 	for (i = 0; (i < 100) && !(READRDP(lp) & (LE_C0_ERR | LE_C0_IDON)); i++)
240 		barrier();
241 	if ((i == 100) || (READRDP(lp) & LE_C0_ERR)) {
242 		printk("LANCE unopened after %d ticks, csr0=%4.4x.\n", i, READRDP(lp));
243 		return -1;
244 	}
245 
246 	/* Clear IDON by writing a "1", enable interrupts and start lance */
247 	WRITERDP(lp, LE_C0_IDON);
248 	WRITERDP(lp, LE_C0_INEA | LE_C0_STRT);
249 
250 	return 0;
251 }
252 
253 static int lance_reset(struct net_device *dev)
254 {
255 	struct lance_private *lp = netdev_priv(dev);
256 	int status;
257 
258 	/* Stop the lance */
259 	WRITERAP(lp, LE_CSR0);
260 	WRITERDP(lp, LE_C0_STOP);
261 
262 	load_csrs(lp);
263 	lance_init_ring(dev);
264 	netif_trans_update(dev); /* prevent tx timeout */
265 	status = init_restart_lance(lp);
266 #ifdef DEBUG_DRIVER
267 	printk("Lance restart=%d\n", status);
268 #endif
269 	return status;
270 }
271 
272 static int lance_rx(struct net_device *dev)
273 {
274 	struct lance_private *lp = netdev_priv(dev);
275 	volatile struct lance_init_block *ib = lp->init_block;
276 	volatile struct lance_rx_desc *rd;
277 	unsigned char bits;
278 #ifdef TEST_HITS
279 	int i;
280 #endif
281 
282 #ifdef TEST_HITS
283 	printk("[");
284 	for (i = 0; i < RX_RING_SIZE; i++) {
285 		if (i == lp->rx_new)
286 			printk("%s",
287 			       ib->brx_ring[i].rmd1_bits & LE_R1_OWN ? "_" : "X");
288 		else
289 			printk("%s",
290 			      ib->brx_ring[i].rmd1_bits & LE_R1_OWN ? "." : "1");
291 	}
292 	printk("]");
293 #endif
294 #ifdef CONFIG_HP300
295 	blinken_leds(0x40, 0);
296 #endif
297 	WRITERDP(lp, LE_C0_RINT | LE_C0_INEA);     /* ack Rx int, reenable ints */
298 	for (rd = &ib->brx_ring[lp->rx_new];     /* For each Rx ring we own... */
299 	     !((bits = rd->rmd1_bits) & LE_R1_OWN);
300 	     rd = &ib->brx_ring[lp->rx_new]) {
301 
302 		/* We got an incomplete frame? */
303 		if ((bits & LE_R1_POK) != LE_R1_POK) {
304 			dev->stats.rx_over_errors++;
305 			dev->stats.rx_errors++;
306 			continue;
307 		} else if (bits & LE_R1_ERR) {
308 			/* Count only the end frame as a rx error,
309 			 * not the beginning
310 			 */
311 			if (bits & LE_R1_BUF)
312 				dev->stats.rx_fifo_errors++;
313 			if (bits & LE_R1_CRC)
314 				dev->stats.rx_crc_errors++;
315 			if (bits & LE_R1_OFL)
316 				dev->stats.rx_over_errors++;
317 			if (bits & LE_R1_FRA)
318 				dev->stats.rx_frame_errors++;
319 			if (bits & LE_R1_EOP)
320 				dev->stats.rx_errors++;
321 		} else {
322 			int len = (rd->mblength & 0xfff) - 4;
323 			struct sk_buff *skb = netdev_alloc_skb(dev, len + 2);
324 
325 			if (!skb) {
326 				dev->stats.rx_dropped++;
327 				rd->mblength = 0;
328 				rd->rmd1_bits = LE_R1_OWN;
329 				lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
330 				return 0;
331 			}
332 
333 			skb_reserve(skb, 2);           /* 16 byte align */
334 			skb_put(skb, len);             /* make room */
335 			skb_copy_to_linear_data(skb,
336 					 (unsigned char *)&(ib->rx_buf[lp->rx_new][0]),
337 					 len);
338 			skb->protocol = eth_type_trans(skb, dev);
339 			netif_rx(skb);
340 			dev->stats.rx_packets++;
341 			dev->stats.rx_bytes += len;
342 		}
343 
344 		/* Return the packet to the pool */
345 		rd->mblength = 0;
346 		rd->rmd1_bits = LE_R1_OWN;
347 		lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
348 	}
349 	return 0;
350 }
351 
352 static int lance_tx(struct net_device *dev)
353 {
354 	struct lance_private *lp = netdev_priv(dev);
355 	volatile struct lance_init_block *ib = lp->init_block;
356 	volatile struct lance_tx_desc *td;
357 	int i, j;
358 	int status;
359 
360 #ifdef CONFIG_HP300
361 	blinken_leds(0x80, 0);
362 #endif
363 	/* csr0 is 2f3 */
364 	WRITERDP(lp, LE_C0_TINT | LE_C0_INEA);
365 	/* csr0 is 73 */
366 
367 	j = lp->tx_old;
368 	for (i = j; i != lp->tx_new; i = j) {
369 		td = &ib->btx_ring[i];
370 
371 		/* If we hit a packet not owned by us, stop */
372 		if (td->tmd1_bits & LE_T1_OWN)
373 			break;
374 
375 		if (td->tmd1_bits & LE_T1_ERR) {
376 			status = td->misc;
377 
378 			dev->stats.tx_errors++;
379 			if (status & LE_T3_RTY)
380 				dev->stats.tx_aborted_errors++;
381 			if (status & LE_T3_LCOL)
382 				dev->stats.tx_window_errors++;
383 
384 			if (status & LE_T3_CLOS) {
385 				dev->stats.tx_carrier_errors++;
386 				if (lp->auto_select) {
387 					lp->tpe = 1 - lp->tpe;
388 					printk("%s: Carrier Lost, trying %s\n",
389 					       dev->name,
390 					       lp->tpe ? "TPE" : "AUI");
391 					/* Stop the lance */
392 					WRITERAP(lp, LE_CSR0);
393 					WRITERDP(lp, LE_C0_STOP);
394 					lance_init_ring(dev);
395 					load_csrs(lp);
396 					init_restart_lance(lp);
397 					return 0;
398 				}
399 			}
400 
401 			/* buffer errors and underflows turn off the transmitter */
402 			/* Restart the adapter */
403 			if (status & (LE_T3_BUF|LE_T3_UFL)) {
404 				dev->stats.tx_fifo_errors++;
405 
406 				printk("%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
407 				       dev->name);
408 				/* Stop the lance */
409 				WRITERAP(lp, LE_CSR0);
410 				WRITERDP(lp, LE_C0_STOP);
411 				lance_init_ring(dev);
412 				load_csrs(lp);
413 				init_restart_lance(lp);
414 				return 0;
415 			}
416 		} else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
417 			/*
418 			 * So we don't count the packet more than once.
419 			 */
420 			td->tmd1_bits &= ~(LE_T1_POK);
421 
422 			/* One collision before packet was sent. */
423 			if (td->tmd1_bits & LE_T1_EONE)
424 				dev->stats.collisions++;
425 
426 			/* More than one collision, be optimistic. */
427 			if (td->tmd1_bits & LE_T1_EMORE)
428 				dev->stats.collisions += 2;
429 
430 			dev->stats.tx_packets++;
431 		}
432 
433 		j = (j + 1) & lp->tx_ring_mod_mask;
434 	}
435 	lp->tx_old = j;
436 	WRITERDP(lp, LE_C0_TINT | LE_C0_INEA);
437 	return 0;
438 }
439 
440 static irqreturn_t
441 lance_interrupt(int irq, void *dev_id)
442 {
443 	struct net_device *dev = (struct net_device *)dev_id;
444 	struct lance_private *lp = netdev_priv(dev);
445 	int csr0;
446 
447 	spin_lock(&lp->devlock);
448 
449 	WRITERAP(lp, LE_CSR0);              /* LANCE Controller Status */
450 	csr0 = READRDP(lp);
451 
452 	PRINT_RINGS();
453 
454 	if (!(csr0 & LE_C0_INTR)) {     /* Check if any interrupt has */
455 		spin_unlock(&lp->devlock);
456 		return IRQ_NONE;        /* been generated by the Lance. */
457 	}
458 
459 	/* Acknowledge all the interrupt sources ASAP */
460 	WRITERDP(lp, csr0 & ~(LE_C0_INEA|LE_C0_TDMD|LE_C0_STOP|LE_C0_STRT|LE_C0_INIT));
461 
462 	if ((csr0 & LE_C0_ERR)) {
463 		/* Clear the error condition */
464 		WRITERDP(lp, LE_C0_BABL|LE_C0_ERR|LE_C0_MISS|LE_C0_INEA);
465 	}
466 
467 	if (csr0 & LE_C0_RINT)
468 		lance_rx(dev);
469 
470 	if (csr0 & LE_C0_TINT)
471 		lance_tx(dev);
472 
473 	/* Log misc errors. */
474 	if (csr0 & LE_C0_BABL)
475 		dev->stats.tx_errors++;       /* Tx babble. */
476 	if (csr0 & LE_C0_MISS)
477 		dev->stats.rx_errors++;       /* Missed a Rx frame. */
478 	if (csr0 & LE_C0_MERR) {
479 		printk("%s: Bus master arbitration failure, status %4.4x.\n",
480 		       dev->name, csr0);
481 		/* Restart the chip. */
482 		WRITERDP(lp, LE_C0_STRT);
483 	}
484 
485 	if (lp->tx_full && netif_queue_stopped(dev) && (TX_BUFFS_AVAIL >= 0)) {
486 		lp->tx_full = 0;
487 		netif_wake_queue(dev);
488 	}
489 
490 	WRITERAP(lp, LE_CSR0);
491 	WRITERDP(lp, LE_C0_BABL|LE_C0_CERR|LE_C0_MISS|LE_C0_MERR|LE_C0_IDON|LE_C0_INEA);
492 
493 	spin_unlock(&lp->devlock);
494 	return IRQ_HANDLED;
495 }
496 
497 int lance_open(struct net_device *dev)
498 {
499 	struct lance_private *lp = netdev_priv(dev);
500 	int res;
501 
502 	/* Install the Interrupt handler. Or we could shunt this out to specific drivers? */
503 	if (request_irq(lp->irq, lance_interrupt, IRQF_SHARED, lp->name, dev))
504 		return -EAGAIN;
505 
506 	res = lance_reset(dev);
507 	spin_lock_init(&lp->devlock);
508 	netif_start_queue(dev);
509 
510 	return res;
511 }
512 EXPORT_SYMBOL_GPL(lance_open);
513 
514 int lance_close(struct net_device *dev)
515 {
516 	struct lance_private *lp = netdev_priv(dev);
517 
518 	netif_stop_queue(dev);
519 
520 	/* Stop the LANCE */
521 	WRITERAP(lp, LE_CSR0);
522 	WRITERDP(lp, LE_C0_STOP);
523 
524 	free_irq(lp->irq, dev);
525 
526 	return 0;
527 }
528 EXPORT_SYMBOL_GPL(lance_close);
529 
530 void lance_tx_timeout(struct net_device *dev, unsigned int txqueue)
531 {
532 	printk("lance_tx_timeout\n");
533 	lance_reset(dev);
534 	netif_trans_update(dev); /* prevent tx timeout */
535 	netif_wake_queue(dev);
536 }
537 EXPORT_SYMBOL_GPL(lance_tx_timeout);
538 
539 netdev_tx_t lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
540 {
541 	struct lance_private *lp = netdev_priv(dev);
542 	volatile struct lance_init_block *ib = lp->init_block;
543 	int entry, skblen, len;
544 	static int outs;
545 	unsigned long flags;
546 
547 	netif_stop_queue(dev);
548 
549 	if (!TX_BUFFS_AVAIL) {
550 		dev_consume_skb_any(skb);
551 		return NETDEV_TX_OK;
552 	}
553 
554 	skblen = skb->len;
555 
556 #ifdef DEBUG_DRIVER
557 	/* dump the packet */
558 	{
559 		int i;
560 
561 		for (i = 0; i < 64; i++) {
562 			if ((i % 16) == 0)
563 				printk("\n");
564 			printk("%2.2x ", skb->data[i]);
565 		}
566 	}
567 #endif
568 	len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
569 	entry = lp->tx_new & lp->tx_ring_mod_mask;
570 	ib->btx_ring[entry].length = (-len) | 0xf000;
571 	ib->btx_ring[entry].misc = 0;
572 
573 	if (skb->len < ETH_ZLEN)
574 		memset((void *)&ib->tx_buf[entry][0], 0, ETH_ZLEN);
575 	skb_copy_from_linear_data(skb, (void *)&ib->tx_buf[entry][0], skblen);
576 
577 	/* Now, give the packet to the lance */
578 	ib->btx_ring[entry].tmd1_bits = (LE_T1_POK|LE_T1_OWN);
579 	lp->tx_new = (lp->tx_new + 1) & lp->tx_ring_mod_mask;
580 
581 	outs++;
582 	/* Kick the lance: transmit now */
583 	WRITERDP(lp, LE_C0_INEA | LE_C0_TDMD);
584 	dev_consume_skb_any(skb);
585 
586 	spin_lock_irqsave(&lp->devlock, flags);
587 	if (TX_BUFFS_AVAIL)
588 		netif_start_queue(dev);
589 	else
590 		lp->tx_full = 1;
591 	spin_unlock_irqrestore(&lp->devlock, flags);
592 
593 	return NETDEV_TX_OK;
594 }
595 EXPORT_SYMBOL_GPL(lance_start_xmit);
596 
597 /* taken from the depca driver via a2065.c */
598 static void lance_load_multicast(struct net_device *dev)
599 {
600 	struct lance_private *lp = netdev_priv(dev);
601 	volatile struct lance_init_block *ib = lp->init_block;
602 	volatile u16 *mcast_table = (u16 *)&ib->filter;
603 	struct netdev_hw_addr *ha;
604 	u32 crc;
605 
606 	/* set all multicast bits */
607 	if (dev->flags & IFF_ALLMULTI) {
608 		ib->filter[0] = 0xffffffff;
609 		ib->filter[1] = 0xffffffff;
610 		return;
611 	}
612 	/* clear the multicast filter */
613 	ib->filter[0] = 0;
614 	ib->filter[1] = 0;
615 
616 	/* Add addresses */
617 	netdev_for_each_mc_addr(ha, dev) {
618 		crc = ether_crc_le(6, ha->addr);
619 		crc = crc >> 26;
620 		mcast_table[crc >> 4] |= 1 << (crc & 0xf);
621 	}
622 }
623 
624 
625 void lance_set_multicast(struct net_device *dev)
626 {
627 	struct lance_private *lp = netdev_priv(dev);
628 	volatile struct lance_init_block *ib = lp->init_block;
629 	int stopped;
630 
631 	stopped = netif_queue_stopped(dev);
632 	if (!stopped)
633 		netif_stop_queue(dev);
634 
635 	while (lp->tx_old != lp->tx_new)
636 		schedule();
637 
638 	WRITERAP(lp, LE_CSR0);
639 	WRITERDP(lp, LE_C0_STOP);
640 	lance_init_ring(dev);
641 
642 	if (dev->flags & IFF_PROMISC) {
643 		ib->mode |= LE_MO_PROM;
644 	} else {
645 		ib->mode &= ~LE_MO_PROM;
646 		lance_load_multicast(dev);
647 	}
648 	load_csrs(lp);
649 	init_restart_lance(lp);
650 
651 	if (!stopped)
652 		netif_start_queue(dev);
653 }
654 EXPORT_SYMBOL_GPL(lance_set_multicast);
655 
656 #ifdef CONFIG_NET_POLL_CONTROLLER
657 void lance_poll(struct net_device *dev)
658 {
659 	struct lance_private *lp = netdev_priv(dev);
660 
661 	spin_lock(&lp->devlock);
662 	WRITERAP(lp, LE_CSR0);
663 	WRITERDP(lp, LE_C0_STRT);
664 	spin_unlock(&lp->devlock);
665 	lance_interrupt(dev->irq, dev);
666 }
667 EXPORT_SYMBOL_GPL(lance_poll);
668 #endif
669 
670 MODULE_LICENSE("GPL");
671