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1 /*
2  *  linux/drivers/acorn/net/ether3.c
3  *
4  *  Copyright (C) 1995-2000 Russell King
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  * SEEQ nq8005 ethernet driver for Acorn/ANT Ether3 card
11  *  for Acorn machines
12  *
13  * By Russell King, with some suggestions from borris@ant.co.uk
14  *
15  * Changelog:
16  * 1.04	RMK	29/02/1996	Won't pass packets that are from our ethernet
17  *				address up to the higher levels - they're
18  *				silently ignored.  I/F can now be put into
19  *				multicast mode.  Receiver routine optimised.
20  * 1.05	RMK	30/02/1996	Now claims interrupt at open when part of
21  *				the kernel rather than when a module.
22  * 1.06	RMK	02/03/1996	Various code cleanups
23  * 1.07	RMK	13/10/1996	Optimised interrupt routine and transmit
24  *				routines.
25  * 1.08	RMK	14/10/1996	Fixed problem with too many packets,
26  *				prevented the kernel message about dropped
27  *				packets appearing too many times a second.
28  *				Now does not disable all IRQs, only the IRQ
29  *				used by this card.
30  * 1.09	RMK	10/11/1996	Only enables TX irq when buffer space is low,
31  *				but we still service the TX queue if we get a
32  *				RX interrupt.
33  * 1.10	RMK	15/07/1997	Fixed autoprobing of NQ8004.
34  * 1.11	RMK	16/11/1997	Fixed autoprobing of NQ8005A.
35  * 1.12	RMK	31/12/1997	Removed reference to dev_tint for Linux 2.1.
36  *      RMK	27/06/1998	Changed asm/delay.h to linux/delay.h.
37  * 1.13	RMK	29/06/1998	Fixed problem with transmission of packets.
38  *				Chip seems to have a bug in, whereby if the
39  *				packet starts two bytes from the end of the
40  *				buffer, it corrupts the receiver chain, and
41  *				never updates the transmit status correctly.
42  * 1.14	RMK	07/01/1998	Added initial code for ETHERB addressing.
43  * 1.15	RMK	30/04/1999	More fixes to the transmit routine for buggy
44  *				hardware.
45  * 1.16	RMK	10/02/2000	Updated for 2.3.43
46  * 1.17	RMK	13/05/2000	Updated for 2.3.99-pre8
47  */
48 
49 #include <linux/module.h>
50 #include <linux/kernel.h>
51 #include <linux/types.h>
52 #include <linux/fcntl.h>
53 #include <linux/interrupt.h>
54 #include <linux/ioport.h>
55 #include <linux/in.h>
56 #include <linux/slab.h>
57 #include <linux/string.h>
58 #include <linux/errno.h>
59 #include <linux/netdevice.h>
60 #include <linux/etherdevice.h>
61 #include <linux/skbuff.h>
62 #include <linux/device.h>
63 #include <linux/init.h>
64 #include <linux/delay.h>
65 #include <linux/bitops.h>
66 
67 #include <asm/ecard.h>
68 #include <asm/io.h>
69 
70 static char version[] __devinitdata = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
71 
72 #include "ether3.h"
73 
74 static unsigned int net_debug = NET_DEBUG;
75 
76 static void	ether3_setmulticastlist(struct net_device *dev);
77 static int	ether3_rx(struct net_device *dev, unsigned int maxcnt);
78 static void	ether3_tx(struct net_device *dev);
79 static int	ether3_open (struct net_device *dev);
80 static int	ether3_sendpacket (struct sk_buff *skb, struct net_device *dev);
81 static irqreturn_t ether3_interrupt (int irq, void *dev_id);
82 static int	ether3_close (struct net_device *dev);
83 static void	ether3_setmulticastlist (struct net_device *dev);
84 static void	ether3_timeout(struct net_device *dev);
85 
86 #define BUS_16		2
87 #define BUS_8		1
88 #define BUS_UNKNOWN	0
89 
90 /* --------------------------------------------------------------------------- */
91 
92 typedef enum {
93 	buffer_write,
94 	buffer_read
95 } buffer_rw_t;
96 
97 /*
98  * ether3 read/write.  Slow things down a bit...
99  * The SEEQ8005 doesn't like us writing to its registers
100  * too quickly.
101  */
ether3_outb(int v,const void __iomem * r)102 static inline void ether3_outb(int v, const void __iomem *r)
103 {
104 	writeb(v, r);
105 	udelay(1);
106 }
107 
ether3_outw(int v,const void __iomem * r)108 static inline void ether3_outw(int v, const void __iomem *r)
109 {
110 	writew(v, r);
111 	udelay(1);
112 }
113 #define ether3_inb(r)		({ unsigned int __v = readb((r)); udelay(1); __v; })
114 #define ether3_inw(r)		({ unsigned int __v = readw((r)); udelay(1); __v; })
115 
116 static int
ether3_setbuffer(struct net_device * dev,buffer_rw_t read,int start)117 ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
118 {
119 	int timeout = 1000;
120 
121 	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
122 	ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
123 
124 	while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
125 		if (!timeout--) {
126 			printk("%s: setbuffer broken\n", dev->name);
127 			priv(dev)->broken = 1;
128 			return 1;
129 		}
130 		udelay(1);
131 	}
132 
133 	if (read == buffer_read) {
134 		ether3_outw(start, REG_DMAADDR);
135 		ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
136 	} else {
137 		ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
138 		ether3_outw(start, REG_DMAADDR);
139 	}
140 	return 0;
141 }
142 
143 /*
144  * write data to the buffer memory
145  */
146 #define ether3_writebuffer(dev,data,length)			\
147 	writesw(REG_BUFWIN, (data), (length) >> 1)
148 
149 #define ether3_writeword(dev,data)				\
150 	writew((data), REG_BUFWIN)
151 
152 #define ether3_writelong(dev,data)	{			\
153 	void __iomem *reg_bufwin = REG_BUFWIN;			\
154 	writew((data), reg_bufwin);				\
155 	writew((data) >> 16, reg_bufwin);			\
156 }
157 
158 /*
159  * read data from the buffer memory
160  */
161 #define ether3_readbuffer(dev,data,length)			\
162 	readsw(REG_BUFWIN, (data), (length) >> 1)
163 
164 #define ether3_readword(dev)					\
165 	readw(REG_BUFWIN)
166 
167 #define ether3_readlong(dev)	 				\
168 	readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)
169 
170 /*
171  * Switch LED off...
172  */
ether3_ledoff(unsigned long data)173 static void ether3_ledoff(unsigned long data)
174 {
175 	struct net_device *dev = (struct net_device *)data;
176 	ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
177 }
178 
179 /*
180  * switch LED on...
181  */
ether3_ledon(struct net_device * dev)182 static inline void ether3_ledon(struct net_device *dev)
183 {
184 	del_timer(&priv(dev)->timer);
185 	priv(dev)->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
186 	priv(dev)->timer.data = (unsigned long)dev;
187 	priv(dev)->timer.function = ether3_ledoff;
188 	add_timer(&priv(dev)->timer);
189 	if (priv(dev)->regs.config2 & CFG2_CTRLO)
190 		ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
191 }
192 
193 /*
194  * Read the ethernet address string from the on board rom.
195  * This is an ascii string!!!
196  */
197 static int __devinit
ether3_addr(char * addr,struct expansion_card * ec)198 ether3_addr(char *addr, struct expansion_card *ec)
199 {
200 	struct in_chunk_dir cd;
201 	char *s;
202 
203 	if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
204 		int i;
205 		for (i = 0; i<6; i++) {
206 			addr[i] = simple_strtoul(s + 1, &s, 0x10);
207 			if (*s != (i==5?')' : ':' ))
208 				break;
209 		}
210 		if (i == 6)
211 			return 0;
212 	}
213 	/* I wonder if we should even let the user continue in this case
214 	 *   - no, it would be better to disable the device
215 	 */
216 	printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
217 	return -ENODEV;
218 }
219 
220 /* --------------------------------------------------------------------------- */
221 
222 static int __devinit
ether3_ramtest(struct net_device * dev,unsigned char byte)223 ether3_ramtest(struct net_device *dev, unsigned char byte)
224 {
225 	unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
226 	int i,ret = 0;
227 	int max_errors = 4;
228 	int bad = -1;
229 
230 	if (!buffer)
231 		return 1;
232 
233 	memset(buffer, byte, RX_END);
234 	ether3_setbuffer(dev, buffer_write, 0);
235 	ether3_writebuffer(dev, buffer, TX_END);
236 	ether3_setbuffer(dev, buffer_write, RX_START);
237 	ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
238 	memset(buffer, byte ^ 0xff, RX_END);
239 	ether3_setbuffer(dev, buffer_read, 0);
240 	ether3_readbuffer(dev, buffer, TX_END);
241 	ether3_setbuffer(dev, buffer_read, RX_START);
242 	ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
243 
244 	for (i = 0; i < RX_END; i++) {
245 		if (buffer[i] != byte) {
246 			if (max_errors > 0 && bad != buffer[i]) {
247 				printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
248 				       dev->name, buffer[i], byte, i);
249 				ret = 2;
250 				max_errors--;
251 				bad = i;
252 			}
253 		} else {
254 			if (bad != -1) {
255 				if (bad != i - 1)
256 					printk(" - 0x%04X\n", i - 1);
257 				printk("\n");
258 				bad = -1;
259 			}
260 		}
261 	}
262 	if (bad != -1)
263 		printk(" - 0xffff\n");
264 	kfree(buffer);
265 
266 	return ret;
267 }
268 
269 /* ------------------------------------------------------------------------------- */
270 
ether3_init_2(struct net_device * dev)271 static int __devinit ether3_init_2(struct net_device *dev)
272 {
273 	int i;
274 
275 	priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
276 	priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
277 	priv(dev)->regs.command = 0;
278 
279 	/*
280 	 * Set up our hardware address
281 	 */
282 	ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
283 	for (i = 0; i < 6; i++)
284 		ether3_outb(dev->dev_addr[i], REG_BUFWIN);
285 
286 	if (dev->flags & IFF_PROMISC)
287 		priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
288 	else if (dev->flags & IFF_MULTICAST)
289 		priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
290 	else
291 		priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
292 
293 	/*
294 	 * There is a problem with the NQ8005 in that it occasionally loses the
295 	 * last two bytes.  To get round this problem, we receive the CRC as
296 	 * well.  That way, if we do lose the last two, then it doesn't matter.
297 	 */
298 	ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
299 	ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
300 	ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
301 	ether3_outw(0, REG_TRANSMITPTR);
302 	ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
303 	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
304 	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
305 	ether3_outw(priv(dev)->regs.command, REG_COMMAND);
306 
307 	i = ether3_ramtest(dev, 0x5A);
308 	if(i)
309 		return i;
310 	i = ether3_ramtest(dev, 0x1E);
311 	if(i)
312 		return i;
313 
314 	ether3_setbuffer(dev, buffer_write, 0);
315 	ether3_writelong(dev, 0);
316 	return 0;
317 }
318 
319 static void
ether3_init_for_open(struct net_device * dev)320 ether3_init_for_open(struct net_device *dev)
321 {
322 	int i;
323 
324 	/* Reset the chip */
325 	ether3_outw(CFG2_RESET, REG_CONFIG2);
326 	udelay(4);
327 
328 	priv(dev)->regs.command = 0;
329 	ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
330 	while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
331 		barrier();
332 
333 	ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
334 	for (i = 0; i < 6; i++)
335 		ether3_outb(dev->dev_addr[i], REG_BUFWIN);
336 
337 	priv(dev)->tx_head	= 0;
338 	priv(dev)->tx_tail	= 0;
339 	priv(dev)->regs.config2 |= CFG2_CTRLO;
340 	priv(dev)->rx_head	= RX_START;
341 
342 	ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
343 	ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
344 	ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
345 	ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
346 	ether3_outw(0, REG_TRANSMITPTR);
347 	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
348 	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
349 
350 	ether3_setbuffer(dev, buffer_write, 0);
351 	ether3_writelong(dev, 0);
352 
353 	priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
354 	ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
355 }
356 
357 static inline int
ether3_probe_bus_8(struct net_device * dev,int val)358 ether3_probe_bus_8(struct net_device *dev, int val)
359 {
360 	int write_low, write_high, read_low, read_high;
361 
362 	write_low = val & 255;
363 	write_high = val >> 8;
364 
365 	printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
366 
367 	ether3_outb(write_low, REG_RECVPTR);
368 	ether3_outb(write_high, REG_RECVPTR + 4);
369 
370 	read_low = ether3_inb(REG_RECVPTR);
371 	read_high = ether3_inb(REG_RECVPTR + 4);
372 
373 	printk(", read8 [%02X:%02X]\n", read_high, read_low);
374 
375 	return read_low == write_low && read_high == write_high;
376 }
377 
378 static inline int
ether3_probe_bus_16(struct net_device * dev,int val)379 ether3_probe_bus_16(struct net_device *dev, int val)
380 {
381 	int read_val;
382 
383 	ether3_outw(val, REG_RECVPTR);
384 	read_val = ether3_inw(REG_RECVPTR);
385 
386 	printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
387 
388 	return read_val == val;
389 }
390 
391 /*
392  * Open/initialize the board.  This is called (in the current kernel)
393  * sometime after booting when the 'ifconfig' program is run.
394  *
395  * This routine should set everything up anew at each open, even
396  * registers that "should" only need to be set once at boot, so that
397  * there is non-reboot way to recover if something goes wrong.
398  */
399 static int
ether3_open(struct net_device * dev)400 ether3_open(struct net_device *dev)
401 {
402 	if (!is_valid_ether_addr(dev->dev_addr)) {
403 		printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
404 			dev->name);
405 		return -EINVAL;
406 	}
407 
408 	if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
409 		return -EAGAIN;
410 
411 	ether3_init_for_open(dev);
412 
413 	netif_start_queue(dev);
414 
415 	return 0;
416 }
417 
418 /*
419  * The inverse routine to ether3_open().
420  */
421 static int
ether3_close(struct net_device * dev)422 ether3_close(struct net_device *dev)
423 {
424 	netif_stop_queue(dev);
425 
426 	disable_irq(dev->irq);
427 
428 	ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
429 	priv(dev)->regs.command = 0;
430 	while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
431 		barrier();
432 	ether3_outb(0x80, REG_CONFIG2 + 4);
433 	ether3_outw(0, REG_COMMAND);
434 
435 	free_irq(dev->irq, dev);
436 
437 	return 0;
438 }
439 
440 /*
441  * Set or clear promiscuous/multicast mode filter for this adaptor.
442  *
443  * We don't attempt any packet filtering.  The card may have a SEEQ 8004
444  * in which does not have the other ethernet address registers present...
445  */
ether3_setmulticastlist(struct net_device * dev)446 static void ether3_setmulticastlist(struct net_device *dev)
447 {
448 	priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
449 
450 	if (dev->flags & IFF_PROMISC) {
451 		/* promiscuous mode */
452 		priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
453 	} else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) {
454 		priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
455 	} else
456 		priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
457 
458 	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
459 }
460 
ether3_timeout(struct net_device * dev)461 static void ether3_timeout(struct net_device *dev)
462 {
463 	unsigned long flags;
464 
465 	del_timer(&priv(dev)->timer);
466 
467 	local_irq_save(flags);
468 	printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
469 	printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
470 		ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
471 	printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
472 		ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
473 	printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
474 		priv(dev)->tx_head, priv(dev)->tx_tail);
475 	ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
476 	printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
477 	local_irq_restore(flags);
478 
479 	priv(dev)->regs.config2 |= CFG2_CTRLO;
480 	dev->stats.tx_errors += 1;
481 	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
482 	priv(dev)->tx_head = priv(dev)->tx_tail = 0;
483 
484 	netif_wake_queue(dev);
485 }
486 
487 /*
488  * Transmit a packet
489  */
490 static int
ether3_sendpacket(struct sk_buff * skb,struct net_device * dev)491 ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
492 {
493 	unsigned long flags;
494 	unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
495 	unsigned int ptr, next_ptr;
496 
497 	if (priv(dev)->broken) {
498 		dev_kfree_skb(skb);
499 		dev->stats.tx_dropped++;
500 		netif_start_queue(dev);
501 		return NETDEV_TX_OK;
502 	}
503 
504 	length = (length + 1) & ~1;
505 	if (length != skb->len) {
506 		if (skb_padto(skb, length))
507 			goto out;
508 	}
509 
510 	next_ptr = (priv(dev)->tx_head + 1) & 15;
511 
512 	local_irq_save(flags);
513 
514 	if (priv(dev)->tx_tail == next_ptr) {
515 		local_irq_restore(flags);
516 		return NETDEV_TX_BUSY;	/* unable to queue */
517 	}
518 
519 	ptr		 = 0x600 * priv(dev)->tx_head;
520 	priv(dev)->tx_head = next_ptr;
521 	next_ptr	*= 0x600;
522 
523 #define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
524 
525 	ether3_setbuffer(dev, buffer_write, next_ptr);
526 	ether3_writelong(dev, 0);
527 	ether3_setbuffer(dev, buffer_write, ptr);
528 	ether3_writelong(dev, 0);
529 	ether3_writebuffer(dev, skb->data, length);
530 	ether3_writeword(dev, htons(next_ptr));
531 	ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
532 	ether3_setbuffer(dev, buffer_write, ptr);
533 	ether3_writeword(dev, htons((ptr + length + 4)));
534 	ether3_writeword(dev, TXHDR_FLAGS >> 16);
535 	ether3_ledon(dev);
536 
537 	if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
538 		ether3_outw(ptr, REG_TRANSMITPTR);
539 		ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
540 	}
541 
542 	next_ptr = (priv(dev)->tx_head + 1) & 15;
543 	local_irq_restore(flags);
544 
545 	dev_kfree_skb(skb);
546 
547 	if (priv(dev)->tx_tail == next_ptr)
548 		netif_stop_queue(dev);
549 
550  out:
551 	return NETDEV_TX_OK;
552 }
553 
554 static irqreturn_t
ether3_interrupt(int irq,void * dev_id)555 ether3_interrupt(int irq, void *dev_id)
556 {
557 	struct net_device *dev = (struct net_device *)dev_id;
558 	unsigned int status, handled = IRQ_NONE;
559 
560 #if NET_DEBUG > 1
561 	if(net_debug & DEBUG_INT)
562 		printk("eth3irq: %d ", irq);
563 #endif
564 
565 	status = ether3_inw(REG_STATUS);
566 
567 	if (status & STAT_INTRX) {
568 		ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
569 		ether3_rx(dev, 12);
570 		handled = IRQ_HANDLED;
571 	}
572 
573 	if (status & STAT_INTTX) {
574 		ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
575 		ether3_tx(dev);
576 		handled = IRQ_HANDLED;
577 	}
578 
579 #if NET_DEBUG > 1
580 	if(net_debug & DEBUG_INT)
581 		printk("done\n");
582 #endif
583 	return handled;
584 }
585 
586 /*
587  * If we have a good packet(s), get it/them out of the buffers.
588  */
ether3_rx(struct net_device * dev,unsigned int maxcnt)589 static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
590 {
591 	unsigned int next_ptr = priv(dev)->rx_head, received = 0;
592 
593 	ether3_ledon(dev);
594 
595 	do {
596 		unsigned int this_ptr, status;
597 		unsigned char addrs[16];
598 
599 		/*
600 		 * read the first 16 bytes from the buffer.
601 		 * This contains the status bytes etc and ethernet addresses,
602 		 * and we also check the source ethernet address to see if
603 		 * it originated from us.
604 		 */
605 		{
606 			unsigned int temp_ptr;
607 			ether3_setbuffer(dev, buffer_read, next_ptr);
608 			temp_ptr = ether3_readword(dev);
609 			status = ether3_readword(dev);
610 			if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
611 				(RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
612 				break;
613 
614 			this_ptr = next_ptr + 4;
615 			next_ptr = ntohs(temp_ptr);
616 		}
617 		ether3_setbuffer(dev, buffer_read, this_ptr);
618 		ether3_readbuffer(dev, addrs+2, 12);
619 
620 if (next_ptr < RX_START || next_ptr >= RX_END) {
621  int i;
622  printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
623  printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
624  for (i = 2; i < 14; i++)
625    printk("%02X ", addrs[i]);
626  printk("\n");
627  next_ptr = priv(dev)->rx_head;
628  break;
629 }
630 		/*
631  		 * ignore our own packets...
632 	 	 */
633 		if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
634 		    !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
635 			maxcnt ++; /* compensate for loopedback packet */
636 			ether3_outw(next_ptr >> 8, REG_RECVEND);
637 		} else
638 		if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
639 			unsigned int length = next_ptr - this_ptr;
640 			struct sk_buff *skb;
641 
642 			if (next_ptr <= this_ptr)
643 				length += RX_END - RX_START;
644 
645 			skb = netdev_alloc_skb(dev, length + 2);
646 			if (skb) {
647 				unsigned char *buf;
648 
649 				skb_reserve(skb, 2);
650 				buf = skb_put(skb, length);
651 				ether3_readbuffer(dev, buf + 12, length - 12);
652 				ether3_outw(next_ptr >> 8, REG_RECVEND);
653 				*(unsigned short *)(buf + 0)	= *(unsigned short *)(addrs + 2);
654 				*(unsigned long *)(buf + 2)	= *(unsigned long *)(addrs + 4);
655 				*(unsigned long *)(buf + 6)	= *(unsigned long *)(addrs + 8);
656 				*(unsigned short *)(buf + 10)	= *(unsigned short *)(addrs + 12);
657 				skb->protocol = eth_type_trans(skb, dev);
658 				netif_rx(skb);
659 				received ++;
660 			} else
661 				goto dropping;
662 		} else {
663 			struct net_device_stats *stats = &dev->stats;
664 			ether3_outw(next_ptr >> 8, REG_RECVEND);
665 			if (status & RXSTAT_OVERSIZE)	  stats->rx_over_errors ++;
666 			if (status & RXSTAT_CRCERROR)	  stats->rx_crc_errors ++;
667 			if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
668 			if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
669 			stats->rx_errors++;
670 		}
671 	}
672 	while (-- maxcnt);
673 
674 done:
675 	dev->stats.rx_packets += received;
676 	priv(dev)->rx_head = next_ptr;
677 	/*
678 	 * If rx went off line, then that means that the buffer may be full.  We
679 	 * have dropped at least one packet.
680 	 */
681 	if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
682 		dev->stats.rx_dropped++;
683     		ether3_outw(next_ptr, REG_RECVPTR);
684 		ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
685 	}
686 
687 	return maxcnt;
688 
689 dropping:{
690 	static unsigned long last_warned;
691 
692 	ether3_outw(next_ptr >> 8, REG_RECVEND);
693 	/*
694 	 * Don't print this message too many times...
695 	 */
696 	if (time_after(jiffies, last_warned + 10 * HZ)) {
697 		last_warned = jiffies;
698 		printk("%s: memory squeeze, dropping packet.\n", dev->name);
699 	}
700 	dev->stats.rx_dropped++;
701 	goto done;
702 	}
703 }
704 
705 /*
706  * Update stats for the transmitted packet(s)
707  */
ether3_tx(struct net_device * dev)708 static void ether3_tx(struct net_device *dev)
709 {
710 	unsigned int tx_tail = priv(dev)->tx_tail;
711 	int max_work = 14;
712 
713 	do {
714 	    	unsigned long status;
715 
716     		/*
717 	    	 * Read the packet header
718     		 */
719 	    	ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
720     		status = ether3_readlong(dev);
721 
722 		/*
723 		 * Check to see if this packet has been transmitted
724 		 */
725 		if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
726 		    (TXSTAT_DONE | TXHDR_TRANSMIT))
727 			break;
728 
729 		/*
730 		 * Update errors
731 		 */
732 		if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
733 			dev->stats.tx_packets++;
734 		else {
735 			dev->stats.tx_errors++;
736 			if (status & TXSTAT_16COLLISIONS)
737 				dev->stats.collisions += 16;
738 			if (status & TXSTAT_BABBLED)
739 				dev->stats.tx_fifo_errors++;
740 		}
741 
742 		tx_tail = (tx_tail + 1) & 15;
743 	} while (--max_work);
744 
745 	if (priv(dev)->tx_tail != tx_tail) {
746 		priv(dev)->tx_tail = tx_tail;
747 		netif_wake_queue(dev);
748 	}
749 }
750 
ether3_banner(void)751 static void __devinit ether3_banner(void)
752 {
753 	static unsigned version_printed = 0;
754 
755 	if (net_debug && version_printed++ == 0)
756 		printk(KERN_INFO "%s", version);
757 }
758 
759 static const struct net_device_ops ether3_netdev_ops = {
760 	.ndo_open		= ether3_open,
761 	.ndo_stop		= ether3_close,
762 	.ndo_start_xmit		= ether3_sendpacket,
763 	.ndo_set_rx_mode	= ether3_setmulticastlist,
764 	.ndo_tx_timeout		= ether3_timeout,
765 	.ndo_validate_addr	= eth_validate_addr,
766 	.ndo_change_mtu		= eth_change_mtu,
767 	.ndo_set_mac_address	= eth_mac_addr,
768 };
769 
770 static int __devinit
ether3_probe(struct expansion_card * ec,const struct ecard_id * id)771 ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
772 {
773 	const struct ether3_data *data = id->data;
774 	struct net_device *dev;
775 	int bus_type, ret;
776 
777 	ether3_banner();
778 
779 	ret = ecard_request_resources(ec);
780 	if (ret)
781 		goto out;
782 
783 	dev = alloc_etherdev(sizeof(struct dev_priv));
784 	if (!dev) {
785 		ret = -ENOMEM;
786 		goto release;
787 	}
788 
789 	SET_NETDEV_DEV(dev, &ec->dev);
790 
791 	priv(dev)->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
792 	if (!priv(dev)->base) {
793 		ret = -ENOMEM;
794 		goto free;
795 	}
796 
797 	ec->irqaddr = priv(dev)->base + data->base_offset;
798 	ec->irqmask = 0xf0;
799 
800 	priv(dev)->seeq = priv(dev)->base + data->base_offset;
801 	dev->irq = ec->irq;
802 
803 	ether3_addr(dev->dev_addr, ec);
804 
805 	init_timer(&priv(dev)->timer);
806 
807 	/* Reset card...
808 	 */
809 	ether3_outb(0x80, REG_CONFIG2 + 4);
810 	bus_type = BUS_UNKNOWN;
811 	udelay(4);
812 
813 	/* Test using Receive Pointer (16-bit register) to find out
814 	 * how the ether3 is connected to the bus...
815 	 */
816 	if (ether3_probe_bus_8(dev, 0x100) &&
817 	    ether3_probe_bus_8(dev, 0x201))
818 		bus_type = BUS_8;
819 
820 	if (bus_type == BUS_UNKNOWN &&
821 	    ether3_probe_bus_16(dev, 0x101) &&
822 	    ether3_probe_bus_16(dev, 0x201))
823 		bus_type = BUS_16;
824 
825 	switch (bus_type) {
826 	case BUS_UNKNOWN:
827 		printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
828 		ret = -ENODEV;
829 		goto free;
830 
831 	case BUS_8:
832 		printk(KERN_ERR "%s: %s found, but is an unsupported "
833 			"8-bit card\n", dev->name, data->name);
834 		ret = -ENODEV;
835 		goto free;
836 
837 	default:
838 		break;
839 	}
840 
841 	if (ether3_init_2(dev)) {
842 		ret = -ENODEV;
843 		goto free;
844 	}
845 
846 	dev->netdev_ops		= &ether3_netdev_ops;
847 	dev->watchdog_timeo	= 5 * HZ / 100;
848 
849 	ret = register_netdev(dev);
850 	if (ret)
851 		goto free;
852 
853 	printk("%s: %s in slot %d, %pM\n",
854 	       dev->name, data->name, ec->slot_no, dev->dev_addr);
855 
856 	ecard_set_drvdata(ec, dev);
857 	return 0;
858 
859  free:
860 	free_netdev(dev);
861  release:
862 	ecard_release_resources(ec);
863  out:
864 	return ret;
865 }
866 
ether3_remove(struct expansion_card * ec)867 static void __devexit ether3_remove(struct expansion_card *ec)
868 {
869 	struct net_device *dev = ecard_get_drvdata(ec);
870 
871 	ecard_set_drvdata(ec, NULL);
872 
873 	unregister_netdev(dev);
874 	free_netdev(dev);
875 	ecard_release_resources(ec);
876 }
877 
878 static struct ether3_data ether3 = {
879 	.name		= "ether3",
880 	.base_offset	= 0,
881 };
882 
883 static struct ether3_data etherb = {
884 	.name		= "etherb",
885 	.base_offset	= 0x800,
886 };
887 
888 static const struct ecard_id ether3_ids[] = {
889 	{ MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
890 	{ MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
891 	{ MANU_ANT,  PROD_ANT_ETHERB, &etherb },
892 	{ 0xffff, 0xffff }
893 };
894 
895 static struct ecard_driver ether3_driver = {
896 	.probe		= ether3_probe,
897 	.remove		= __devexit_p(ether3_remove),
898 	.id_table	= ether3_ids,
899 	.drv = {
900 		.name	= "ether3",
901 	},
902 };
903 
ether3_init(void)904 static int __init ether3_init(void)
905 {
906 	return ecard_register_driver(&ether3_driver);
907 }
908 
ether3_exit(void)909 static void __exit ether3_exit(void)
910 {
911 	ecard_remove_driver(&ether3_driver);
912 }
913 
914 module_init(ether3_init);
915 module_exit(ether3_exit);
916 
917 MODULE_LICENSE("GPL");
918