1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  linux/drivers/acorn/net/ether3.c
4  *
5  *  Copyright (C) 1995-2000 Russell King
6  *
7  * SEEQ nq8005 ethernet driver for Acorn/ANT Ether3 card
8  *  for Acorn machines
9  *
10  * By Russell King, with some suggestions from borris@ant.co.uk
11  *
12  * Changelog:
13  * 1.04	RMK	29/02/1996	Won't pass packets that are from our ethernet
14  *				address up to the higher levels - they're
15  *				silently ignored.  I/F can now be put into
16  *				multicast mode.  Receiver routine optimised.
17  * 1.05	RMK	30/02/1996	Now claims interrupt at open when part of
18  *				the kernel rather than when a module.
19  * 1.06	RMK	02/03/1996	Various code cleanups
20  * 1.07	RMK	13/10/1996	Optimised interrupt routine and transmit
21  *				routines.
22  * 1.08	RMK	14/10/1996	Fixed problem with too many packets,
23  *				prevented the kernel message about dropped
24  *				packets appearing too many times a second.
25  *				Now does not disable all IRQs, only the IRQ
26  *				used by this card.
27  * 1.09	RMK	10/11/1996	Only enables TX irq when buffer space is low,
28  *				but we still service the TX queue if we get a
29  *				RX interrupt.
30  * 1.10	RMK	15/07/1997	Fixed autoprobing of NQ8004.
31  * 1.11	RMK	16/11/1997	Fixed autoprobing of NQ8005A.
32  * 1.12	RMK	31/12/1997	Removed reference to dev_tint for Linux 2.1.
33  *      RMK	27/06/1998	Changed asm/delay.h to linux/delay.h.
34  * 1.13	RMK	29/06/1998	Fixed problem with transmission of packets.
35  *				Chip seems to have a bug in, whereby if the
36  *				packet starts two bytes from the end of the
37  *				buffer, it corrupts the receiver chain, and
38  *				never updates the transmit status correctly.
39  * 1.14	RMK	07/01/1998	Added initial code for ETHERB addressing.
40  * 1.15	RMK	30/04/1999	More fixes to the transmit routine for buggy
41  *				hardware.
42  * 1.16	RMK	10/02/2000	Updated for 2.3.43
43  * 1.17	RMK	13/05/2000	Updated for 2.3.99-pre8
44  */
45 
46 #include <linux/module.h>
47 #include <linux/kernel.h>
48 #include <linux/types.h>
49 #include <linux/fcntl.h>
50 #include <linux/interrupt.h>
51 #include <linux/ioport.h>
52 #include <linux/in.h>
53 #include <linux/slab.h>
54 #include <linux/string.h>
55 #include <linux/errno.h>
56 #include <linux/netdevice.h>
57 #include <linux/etherdevice.h>
58 #include <linux/skbuff.h>
59 #include <linux/device.h>
60 #include <linux/init.h>
61 #include <linux/delay.h>
62 #include <linux/bitops.h>
63 
64 #include <asm/ecard.h>
65 #include <asm/io.h>
66 
67 static char version[] = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
68 
69 #include "ether3.h"
70 
71 static unsigned int net_debug = NET_DEBUG;
72 
73 static void	ether3_setmulticastlist(struct net_device *dev);
74 static int	ether3_rx(struct net_device *dev, unsigned int maxcnt);
75 static void	ether3_tx(struct net_device *dev);
76 static int	ether3_open (struct net_device *dev);
77 static netdev_tx_t	ether3_sendpacket(struct sk_buff *skb,
78 					  struct net_device *dev);
79 static irqreturn_t ether3_interrupt (int irq, void *dev_id);
80 static int	ether3_close (struct net_device *dev);
81 static void	ether3_setmulticastlist (struct net_device *dev);
82 static void	ether3_timeout(struct net_device *dev, unsigned int txqueue);
83 
84 #define BUS_16		2
85 #define BUS_8		1
86 #define BUS_UNKNOWN	0
87 
88 /* --------------------------------------------------------------------------- */
89 
90 typedef enum {
91 	buffer_write,
92 	buffer_read
93 } buffer_rw_t;
94 
95 /*
96  * ether3 read/write.  Slow things down a bit...
97  * The SEEQ8005 doesn't like us writing to its registers
98  * too quickly.
99  */
ether3_outb(int v,void __iomem * r)100 static inline void ether3_outb(int v, void __iomem *r)
101 {
102 	writeb(v, r);
103 	udelay(1);
104 }
105 
ether3_outw(int v,void __iomem * r)106 static inline void ether3_outw(int v, void __iomem *r)
107 {
108 	writew(v, r);
109 	udelay(1);
110 }
111 #define ether3_inb(r)		({ unsigned int __v = readb((r)); udelay(1); __v; })
112 #define ether3_inw(r)		({ unsigned int __v = readw((r)); udelay(1); __v; })
113 
114 static int
ether3_setbuffer(struct net_device * dev,buffer_rw_t read,int start)115 ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
116 {
117 	int timeout = 1000;
118 
119 	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
120 	ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
121 
122 	while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
123 		if (!timeout--) {
124 			printk("%s: setbuffer broken\n", dev->name);
125 			priv(dev)->broken = 1;
126 			return 1;
127 		}
128 		udelay(1);
129 	}
130 
131 	if (read == buffer_read) {
132 		ether3_outw(start, REG_DMAADDR);
133 		ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
134 	} else {
135 		ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
136 		ether3_outw(start, REG_DMAADDR);
137 	}
138 	return 0;
139 }
140 
141 /*
142  * write data to the buffer memory
143  */
144 #define ether3_writebuffer(dev,data,length)			\
145 	writesw(REG_BUFWIN, (data), (length) >> 1)
146 
147 #define ether3_writeword(dev,data)				\
148 	writew((data), REG_BUFWIN)
149 
150 #define ether3_writelong(dev,data)	{			\
151 	void __iomem *reg_bufwin = REG_BUFWIN;			\
152 	writew((data), reg_bufwin);				\
153 	writew((data) >> 16, reg_bufwin);			\
154 }
155 
156 /*
157  * read data from the buffer memory
158  */
159 #define ether3_readbuffer(dev,data,length)			\
160 	readsw(REG_BUFWIN, (data), (length) >> 1)
161 
162 #define ether3_readword(dev)					\
163 	readw(REG_BUFWIN)
164 
165 #define ether3_readlong(dev)	 				\
166 	readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)
167 
168 /*
169  * Switch LED off...
170  */
ether3_ledoff(struct timer_list * t)171 static void ether3_ledoff(struct timer_list *t)
172 {
173 	struct dev_priv *private = from_timer(private, t, timer);
174 	struct net_device *dev = private->dev;
175 
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 	add_timer(&priv(dev)->timer);
187 	if (priv(dev)->regs.config2 & CFG2_CTRLO)
188 		ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
189 }
190 
191 /*
192  * Read the ethernet address string from the on board rom.
193  * This is an ascii string!!!
194  */
195 static int
ether3_addr(char * addr,struct expansion_card * ec)196 ether3_addr(char *addr, struct expansion_card *ec)
197 {
198 	struct in_chunk_dir cd;
199 	char *s;
200 
201 	if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
202 		int i;
203 		for (i = 0; i<6; i++) {
204 			addr[i] = simple_strtoul(s + 1, &s, 0x10);
205 			if (*s != (i==5?')' : ':' ))
206 				break;
207 		}
208 		if (i == 6)
209 			return 0;
210 	}
211 	/* I wonder if we should even let the user continue in this case
212 	 *   - no, it would be better to disable the device
213 	 */
214 	printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
215 	return -ENODEV;
216 }
217 
218 /* --------------------------------------------------------------------------- */
219 
220 static int
ether3_ramtest(struct net_device * dev,unsigned char byte)221 ether3_ramtest(struct net_device *dev, unsigned char byte)
222 {
223 	unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
224 	int i,ret = 0;
225 	int max_errors = 4;
226 	int bad = -1;
227 
228 	if (!buffer)
229 		return 1;
230 
231 	memset(buffer, byte, RX_END);
232 	ether3_setbuffer(dev, buffer_write, 0);
233 	ether3_writebuffer(dev, buffer, TX_END);
234 	ether3_setbuffer(dev, buffer_write, RX_START);
235 	ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
236 	memset(buffer, byte ^ 0xff, RX_END);
237 	ether3_setbuffer(dev, buffer_read, 0);
238 	ether3_readbuffer(dev, buffer, TX_END);
239 	ether3_setbuffer(dev, buffer_read, RX_START);
240 	ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
241 
242 	for (i = 0; i < RX_END; i++) {
243 		if (buffer[i] != byte) {
244 			if (max_errors > 0 && bad != buffer[i]) {
245 				printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
246 				       dev->name, buffer[i], byte, i);
247 				ret = 2;
248 				max_errors--;
249 				bad = i;
250 			}
251 		} else {
252 			if (bad != -1) {
253 				if (bad != i - 1)
254 					printk(" - 0x%04X\n", i - 1);
255 				printk("\n");
256 				bad = -1;
257 			}
258 		}
259 	}
260 	if (bad != -1)
261 		printk(" - 0xffff\n");
262 	kfree(buffer);
263 
264 	return ret;
265 }
266 
267 /* ------------------------------------------------------------------------------- */
268 
ether3_init_2(struct net_device * dev)269 static int ether3_init_2(struct net_device *dev)
270 {
271 	int i;
272 
273 	priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
274 	priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
275 	priv(dev)->regs.command = 0;
276 
277 	/*
278 	 * Set up our hardware address
279 	 */
280 	ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
281 	for (i = 0; i < 6; i++)
282 		ether3_outb(dev->dev_addr[i], REG_BUFWIN);
283 
284 	if (dev->flags & IFF_PROMISC)
285 		priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
286 	else if (dev->flags & IFF_MULTICAST)
287 		priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
288 	else
289 		priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
290 
291 	/*
292 	 * There is a problem with the NQ8005 in that it occasionally loses the
293 	 * last two bytes.  To get round this problem, we receive the CRC as
294 	 * well.  That way, if we do lose the last two, then it doesn't matter.
295 	 */
296 	ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
297 	ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
298 	ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
299 	ether3_outw(0, REG_TRANSMITPTR);
300 	ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
301 	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
302 	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
303 	ether3_outw(priv(dev)->regs.command, REG_COMMAND);
304 
305 	i = ether3_ramtest(dev, 0x5A);
306 	if(i)
307 		return i;
308 	i = ether3_ramtest(dev, 0x1E);
309 	if(i)
310 		return i;
311 
312 	ether3_setbuffer(dev, buffer_write, 0);
313 	ether3_writelong(dev, 0);
314 	return 0;
315 }
316 
317 static void
ether3_init_for_open(struct net_device * dev)318 ether3_init_for_open(struct net_device *dev)
319 {
320 	int i;
321 
322 	/* Reset the chip */
323 	ether3_outw(CFG2_RESET, REG_CONFIG2);
324 	udelay(4);
325 
326 	priv(dev)->regs.command = 0;
327 	ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
328 	while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
329 		barrier();
330 
331 	ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
332 	for (i = 0; i < 6; i++)
333 		ether3_outb(dev->dev_addr[i], REG_BUFWIN);
334 
335 	priv(dev)->tx_head	= 0;
336 	priv(dev)->tx_tail	= 0;
337 	priv(dev)->regs.config2 |= CFG2_CTRLO;
338 	priv(dev)->rx_head	= RX_START;
339 
340 	ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
341 	ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
342 	ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
343 	ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
344 	ether3_outw(0, REG_TRANSMITPTR);
345 	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
346 	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
347 
348 	ether3_setbuffer(dev, buffer_write, 0);
349 	ether3_writelong(dev, 0);
350 
351 	priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
352 	ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
353 }
354 
355 static inline int
ether3_probe_bus_8(struct net_device * dev,int val)356 ether3_probe_bus_8(struct net_device *dev, int val)
357 {
358 	int write_low, write_high, read_low, read_high;
359 
360 	write_low = val & 255;
361 	write_high = val >> 8;
362 
363 	printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
364 
365 	ether3_outb(write_low, REG_RECVPTR);
366 	ether3_outb(write_high, REG_RECVPTR + 4);
367 
368 	read_low = ether3_inb(REG_RECVPTR);
369 	read_high = ether3_inb(REG_RECVPTR + 4);
370 
371 	printk(", read8 [%02X:%02X]\n", read_high, read_low);
372 
373 	return read_low == write_low && read_high == write_high;
374 }
375 
376 static inline int
ether3_probe_bus_16(struct net_device * dev,int val)377 ether3_probe_bus_16(struct net_device *dev, int val)
378 {
379 	int read_val;
380 
381 	ether3_outw(val, REG_RECVPTR);
382 	read_val = ether3_inw(REG_RECVPTR);
383 
384 	printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
385 
386 	return read_val == val;
387 }
388 
389 /*
390  * Open/initialize the board.  This is called (in the current kernel)
391  * sometime after booting when the 'ifconfig' program is run.
392  *
393  * This routine should set everything up anew at each open, even
394  * registers that "should" only need to be set once at boot, so that
395  * there is non-reboot way to recover if something goes wrong.
396  */
397 static int
ether3_open(struct net_device * dev)398 ether3_open(struct net_device *dev)
399 {
400 	if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
401 		return -EAGAIN;
402 
403 	ether3_init_for_open(dev);
404 
405 	netif_start_queue(dev);
406 
407 	return 0;
408 }
409 
410 /*
411  * The inverse routine to ether3_open().
412  */
413 static int
ether3_close(struct net_device * dev)414 ether3_close(struct net_device *dev)
415 {
416 	netif_stop_queue(dev);
417 
418 	disable_irq(dev->irq);
419 
420 	ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
421 	priv(dev)->regs.command = 0;
422 	while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
423 		barrier();
424 	ether3_outb(0x80, REG_CONFIG2 + 4);
425 	ether3_outw(0, REG_COMMAND);
426 
427 	free_irq(dev->irq, dev);
428 
429 	return 0;
430 }
431 
432 /*
433  * Set or clear promiscuous/multicast mode filter for this adaptor.
434  *
435  * We don't attempt any packet filtering.  The card may have a SEEQ 8004
436  * in which does not have the other ethernet address registers present...
437  */
ether3_setmulticastlist(struct net_device * dev)438 static void ether3_setmulticastlist(struct net_device *dev)
439 {
440 	priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
441 
442 	if (dev->flags & IFF_PROMISC) {
443 		/* promiscuous mode */
444 		priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
445 	} else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) {
446 		priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
447 	} else
448 		priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
449 
450 	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
451 }
452 
ether3_timeout(struct net_device * dev,unsigned int txqueue)453 static void ether3_timeout(struct net_device *dev, unsigned int txqueue)
454 {
455 	unsigned long flags;
456 
457 	del_timer(&priv(dev)->timer);
458 
459 	local_irq_save(flags);
460 	printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
461 	printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
462 		ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
463 	printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
464 		ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
465 	printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
466 		priv(dev)->tx_head, priv(dev)->tx_tail);
467 	ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
468 	printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
469 	local_irq_restore(flags);
470 
471 	priv(dev)->regs.config2 |= CFG2_CTRLO;
472 	dev->stats.tx_errors += 1;
473 	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
474 	priv(dev)->tx_head = priv(dev)->tx_tail = 0;
475 
476 	netif_wake_queue(dev);
477 }
478 
479 /*
480  * Transmit a packet
481  */
482 static netdev_tx_t
ether3_sendpacket(struct sk_buff * skb,struct net_device * dev)483 ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
484 {
485 	unsigned long flags;
486 	unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
487 	unsigned int ptr, next_ptr;
488 
489 	if (priv(dev)->broken) {
490 		dev_kfree_skb(skb);
491 		dev->stats.tx_dropped++;
492 		netif_start_queue(dev);
493 		return NETDEV_TX_OK;
494 	}
495 
496 	length = (length + 1) & ~1;
497 	if (length != skb->len) {
498 		if (skb_padto(skb, length))
499 			goto out;
500 	}
501 
502 	next_ptr = (priv(dev)->tx_head + 1) & 15;
503 
504 	local_irq_save(flags);
505 
506 	if (priv(dev)->tx_tail == next_ptr) {
507 		local_irq_restore(flags);
508 		return NETDEV_TX_BUSY;	/* unable to queue */
509 	}
510 
511 	ptr		 = 0x600 * priv(dev)->tx_head;
512 	priv(dev)->tx_head = next_ptr;
513 	next_ptr	*= 0x600;
514 
515 #define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
516 
517 	ether3_setbuffer(dev, buffer_write, next_ptr);
518 	ether3_writelong(dev, 0);
519 	ether3_setbuffer(dev, buffer_write, ptr);
520 	ether3_writelong(dev, 0);
521 	ether3_writebuffer(dev, skb->data, length);
522 	ether3_writeword(dev, htons(next_ptr));
523 	ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
524 	ether3_setbuffer(dev, buffer_write, ptr);
525 	ether3_writeword(dev, htons((ptr + length + 4)));
526 	ether3_writeword(dev, TXHDR_FLAGS >> 16);
527 	ether3_ledon(dev);
528 
529 	if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
530 		ether3_outw(ptr, REG_TRANSMITPTR);
531 		ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
532 	}
533 
534 	next_ptr = (priv(dev)->tx_head + 1) & 15;
535 	local_irq_restore(flags);
536 
537 	dev_kfree_skb(skb);
538 
539 	if (priv(dev)->tx_tail == next_ptr)
540 		netif_stop_queue(dev);
541 
542  out:
543 	return NETDEV_TX_OK;
544 }
545 
546 static irqreturn_t
ether3_interrupt(int irq,void * dev_id)547 ether3_interrupt(int irq, void *dev_id)
548 {
549 	struct net_device *dev = (struct net_device *)dev_id;
550 	unsigned int status, handled = IRQ_NONE;
551 
552 #if NET_DEBUG > 1
553 	if(net_debug & DEBUG_INT)
554 		printk("eth3irq: %d ", irq);
555 #endif
556 
557 	status = ether3_inw(REG_STATUS);
558 
559 	if (status & STAT_INTRX) {
560 		ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
561 		ether3_rx(dev, 12);
562 		handled = IRQ_HANDLED;
563 	}
564 
565 	if (status & STAT_INTTX) {
566 		ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
567 		ether3_tx(dev);
568 		handled = IRQ_HANDLED;
569 	}
570 
571 #if NET_DEBUG > 1
572 	if(net_debug & DEBUG_INT)
573 		printk("done\n");
574 #endif
575 	return handled;
576 }
577 
578 /*
579  * If we have a good packet(s), get it/them out of the buffers.
580  */
ether3_rx(struct net_device * dev,unsigned int maxcnt)581 static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
582 {
583 	unsigned int next_ptr = priv(dev)->rx_head, received = 0;
584 
585 	ether3_ledon(dev);
586 
587 	do {
588 		unsigned int this_ptr, status;
589 		unsigned char addrs[16];
590 
591 		/*
592 		 * read the first 16 bytes from the buffer.
593 		 * This contains the status bytes etc and ethernet addresses,
594 		 * and we also check the source ethernet address to see if
595 		 * it originated from us.
596 		 */
597 		{
598 			unsigned int temp_ptr;
599 			ether3_setbuffer(dev, buffer_read, next_ptr);
600 			temp_ptr = ether3_readword(dev);
601 			status = ether3_readword(dev);
602 			if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
603 				(RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
604 				break;
605 
606 			this_ptr = next_ptr + 4;
607 			next_ptr = ntohs(temp_ptr);
608 		}
609 		ether3_setbuffer(dev, buffer_read, this_ptr);
610 		ether3_readbuffer(dev, addrs+2, 12);
611 
612 if (next_ptr < RX_START || next_ptr >= RX_END) {
613  printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
614  printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
615  printk("%pM %pM\n", addrs + 2, addrs + 8);
616  next_ptr = priv(dev)->rx_head;
617  break;
618 }
619 		/*
620 		 * ignore our own packets...
621 	 	 */
622 		if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
623 		    !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
624 			maxcnt ++; /* compensate for loopedback packet */
625 			ether3_outw(next_ptr >> 8, REG_RECVEND);
626 		} else
627 		if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
628 			unsigned int length = next_ptr - this_ptr;
629 			struct sk_buff *skb;
630 
631 			if (next_ptr <= this_ptr)
632 				length += RX_END - RX_START;
633 
634 			skb = netdev_alloc_skb(dev, length + 2);
635 			if (skb) {
636 				unsigned char *buf;
637 
638 				skb_reserve(skb, 2);
639 				buf = skb_put(skb, length);
640 				ether3_readbuffer(dev, buf + 12, length - 12);
641 				ether3_outw(next_ptr >> 8, REG_RECVEND);
642 				*(unsigned short *)(buf + 0)	= *(unsigned short *)(addrs + 2);
643 				*(unsigned long *)(buf + 2)	= *(unsigned long *)(addrs + 4);
644 				*(unsigned long *)(buf + 6)	= *(unsigned long *)(addrs + 8);
645 				*(unsigned short *)(buf + 10)	= *(unsigned short *)(addrs + 12);
646 				skb->protocol = eth_type_trans(skb, dev);
647 				netif_rx(skb);
648 				received ++;
649 			} else {
650 				ether3_outw(next_ptr >> 8, REG_RECVEND);
651 				dev->stats.rx_dropped++;
652 				goto done;
653 			}
654 		} else {
655 			struct net_device_stats *stats = &dev->stats;
656 			ether3_outw(next_ptr >> 8, REG_RECVEND);
657 			if (status & RXSTAT_OVERSIZE)	  stats->rx_over_errors ++;
658 			if (status & RXSTAT_CRCERROR)	  stats->rx_crc_errors ++;
659 			if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
660 			if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
661 			stats->rx_errors++;
662 		}
663 	}
664 	while (-- maxcnt);
665 
666 done:
667 	dev->stats.rx_packets += received;
668 	priv(dev)->rx_head = next_ptr;
669 	/*
670 	 * If rx went off line, then that means that the buffer may be full.  We
671 	 * have dropped at least one packet.
672 	 */
673 	if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
674 		dev->stats.rx_dropped++;
675 		ether3_outw(next_ptr, REG_RECVPTR);
676 		ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
677 	}
678 
679 	return maxcnt;
680 }
681 
682 /*
683  * Update stats for the transmitted packet(s)
684  */
ether3_tx(struct net_device * dev)685 static void ether3_tx(struct net_device *dev)
686 {
687 	unsigned int tx_tail = priv(dev)->tx_tail;
688 	int max_work = 14;
689 
690 	do {
691 	    	unsigned long status;
692 
693 		/*
694 	    	 * Read the packet header
695 		 */
696 	    	ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
697 		status = ether3_readlong(dev);
698 
699 		/*
700 		 * Check to see if this packet has been transmitted
701 		 */
702 		if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
703 		    (TXSTAT_DONE | TXHDR_TRANSMIT))
704 			break;
705 
706 		/*
707 		 * Update errors
708 		 */
709 		if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
710 			dev->stats.tx_packets++;
711 		else {
712 			dev->stats.tx_errors++;
713 			if (status & TXSTAT_16COLLISIONS)
714 				dev->stats.collisions += 16;
715 			if (status & TXSTAT_BABBLED)
716 				dev->stats.tx_fifo_errors++;
717 		}
718 
719 		tx_tail = (tx_tail + 1) & 15;
720 	} while (--max_work);
721 
722 	if (priv(dev)->tx_tail != tx_tail) {
723 		priv(dev)->tx_tail = tx_tail;
724 		netif_wake_queue(dev);
725 	}
726 }
727 
ether3_banner(void)728 static void ether3_banner(void)
729 {
730 	static unsigned version_printed = 0;
731 
732 	if (net_debug && version_printed++ == 0)
733 		printk(KERN_INFO "%s", version);
734 }
735 
736 static const struct net_device_ops ether3_netdev_ops = {
737 	.ndo_open		= ether3_open,
738 	.ndo_stop		= ether3_close,
739 	.ndo_start_xmit		= ether3_sendpacket,
740 	.ndo_set_rx_mode	= ether3_setmulticastlist,
741 	.ndo_tx_timeout		= ether3_timeout,
742 	.ndo_validate_addr	= eth_validate_addr,
743 	.ndo_set_mac_address	= eth_mac_addr,
744 };
745 
746 static int
ether3_probe(struct expansion_card * ec,const struct ecard_id * id)747 ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
748 {
749 	const struct ether3_data *data = id->data;
750 	struct net_device *dev;
751 	int bus_type, ret;
752 	u8 addr[ETH_ALEN];
753 
754 	ether3_banner();
755 
756 	ret = ecard_request_resources(ec);
757 	if (ret)
758 		goto out;
759 
760 	dev = alloc_etherdev(sizeof(struct dev_priv));
761 	if (!dev) {
762 		ret = -ENOMEM;
763 		goto release;
764 	}
765 
766 	SET_NETDEV_DEV(dev, &ec->dev);
767 
768 	priv(dev)->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
769 	if (!priv(dev)->base) {
770 		ret = -ENOMEM;
771 		goto free;
772 	}
773 
774 	ec->irqaddr = priv(dev)->base + data->base_offset;
775 	ec->irqmask = 0xf0;
776 
777 	priv(dev)->seeq = priv(dev)->base + data->base_offset;
778 	dev->irq = ec->irq;
779 
780 	ether3_addr(addr, ec);
781 	eth_hw_addr_set(dev, addr);
782 
783 	priv(dev)->dev = dev;
784 	timer_setup(&priv(dev)->timer, ether3_ledoff, 0);
785 
786 	/* Reset card...
787 	 */
788 	ether3_outb(0x80, REG_CONFIG2 + 4);
789 	bus_type = BUS_UNKNOWN;
790 	udelay(4);
791 
792 	/* Test using Receive Pointer (16-bit register) to find out
793 	 * how the ether3 is connected to the bus...
794 	 */
795 	if (ether3_probe_bus_8(dev, 0x100) &&
796 	    ether3_probe_bus_8(dev, 0x201))
797 		bus_type = BUS_8;
798 
799 	if (bus_type == BUS_UNKNOWN &&
800 	    ether3_probe_bus_16(dev, 0x101) &&
801 	    ether3_probe_bus_16(dev, 0x201))
802 		bus_type = BUS_16;
803 
804 	switch (bus_type) {
805 	case BUS_UNKNOWN:
806 		printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
807 		ret = -ENODEV;
808 		goto free;
809 
810 	case BUS_8:
811 		printk(KERN_ERR "%s: %s found, but is an unsupported "
812 			"8-bit card\n", dev->name, data->name);
813 		ret = -ENODEV;
814 		goto free;
815 
816 	default:
817 		break;
818 	}
819 
820 	if (ether3_init_2(dev)) {
821 		ret = -ENODEV;
822 		goto free;
823 	}
824 
825 	dev->netdev_ops		= &ether3_netdev_ops;
826 	dev->watchdog_timeo	= 5 * HZ / 100;
827 
828 	ret = register_netdev(dev);
829 	if (ret)
830 		goto free;
831 
832 	printk("%s: %s in slot %d, %pM\n",
833 	       dev->name, data->name, ec->slot_no, dev->dev_addr);
834 
835 	ecard_set_drvdata(ec, dev);
836 	return 0;
837 
838  free:
839 	free_netdev(dev);
840  release:
841 	ecard_release_resources(ec);
842  out:
843 	return ret;
844 }
845 
ether3_remove(struct expansion_card * ec)846 static void ether3_remove(struct expansion_card *ec)
847 {
848 	struct net_device *dev = ecard_get_drvdata(ec);
849 
850 	ecard_set_drvdata(ec, NULL);
851 
852 	unregister_netdev(dev);
853 	free_netdev(dev);
854 	ecard_release_resources(ec);
855 }
856 
857 static struct ether3_data ether3 = {
858 	.name		= "ether3",
859 	.base_offset	= 0,
860 };
861 
862 static struct ether3_data etherb = {
863 	.name		= "etherb",
864 	.base_offset	= 0x800,
865 };
866 
867 static const struct ecard_id ether3_ids[] = {
868 	{ MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
869 	{ MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
870 	{ MANU_ANT,  PROD_ANT_ETHERB, &etherb },
871 	{ 0xffff, 0xffff }
872 };
873 
874 static struct ecard_driver ether3_driver = {
875 	.probe		= ether3_probe,
876 	.remove		= ether3_remove,
877 	.id_table	= ether3_ids,
878 	.drv = {
879 		.name	= "ether3",
880 	},
881 };
882 
ether3_init(void)883 static int __init ether3_init(void)
884 {
885 	return ecard_register_driver(&ether3_driver);
886 }
887 
ether3_exit(void)888 static void __exit ether3_exit(void)
889 {
890 	ecard_remove_driver(&ether3_driver);
891 }
892 
893 module_init(ether3_init);
894 module_exit(ether3_exit);
895 
896 MODULE_LICENSE("GPL");
897