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1 /* atp.c: Attached (pocket) ethernet adapter driver for linux. */
2 /*
3 This is a driver for a commonly OEMed pocket (parallel port)
4 ethernet adapter.
5
6 Written 1993,1994,1995 by Donald Becker.
7
8 Copyright 1993 United States Government as represented by the
9 Director, National Security Agency.
10
11 This software may be used and distributed according to the terms
12 of the GNU Public License, incorporated herein by reference.
13
14 The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
15 Center of Excellence in Space Data and Information Sciences
16 Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
17
18 The timer-based reset code was written by Bill Carlson, wwc@super.org.
19 */
20
21 static char *version =
22 "atp.c:v1.01 1/18/95 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
23
24 /*
25 This file is a device driver for the RealTek (aka AT-Lan-Tec) pocket
26 ethernet adapter. This is a common low-cost OEM pocket ethernet
27 adapter, sold under many names.
28
29 Sources:
30 This driver was written from the packet driver assembly code provided by
31 Vincent Bono of AT-Lan-Tec. Ever try to figure out how a complicated
32 device works just from the assembly code? It ain't pretty. The following
33 description is written based on guesses and writing lots of special-purpose
34 code to test my theorized operation.
35
36 Theory of Operation
37
38 The RTL8002 adapter seems to be built around a custom spin of the SEEQ
39 controller core. It probably has a 16K or 64K internal packet buffer, of
40 which the first 4K is devoted to transmit and the rest to receive.
41 The controller maintains the queue of received packet and the packet buffer
42 access pointer internally, with only 'reset to beginning' and 'skip to next
43 packet' commands visible. The transmit packet queue holds two (or more?)
44 packets: both 'retransmit this packet' (due to collision) and 'transmit next
45 packet' commands must be started by hand.
46
47 The station address is stored in a standard bit-serial EEPROM which must be
48 read (ughh) by the device driver. (Provisions have been made for
49 substituting a 74S288 PROM, but I haven't gotten reports of any models
50 using it.) Unlike built-in devices, a pocket adapter can temporarily lose
51 power without indication to the device driver. The major effect is that
52 the station address, receive filter (promiscuous, etc.) and transceiver
53 must be reset.
54
55 The controller itself has 16 registers, some of which use only the lower
56 bits. The registers are read and written 4 bits at a time. The four bit
57 register address is presented on the data lines along with a few additional
58 timing and control bits. The data is then read from status port or written
59 to the data port.
60
61 Since the bulk data transfer of the actual packets through the slow
62 parallel port dominates the driver's running time, four distinct data
63 (non-register) transfer modes are provided by the adapter, two in each
64 direction. In the first mode timing for the nibble transfers is
65 provided through the data port. In the second mode the same timing is
66 provided through the control port. In either case the data is read from
67 the status port and written to the data port, just as it is accessing
68 registers.
69
70 In addition to the basic data transfer methods, several more are modes are
71 created by adding some delay by doing multiple reads of the data to allow
72 it to stabilize. This delay seems to be needed on most machines.
73
74 The data transfer mode is stored in the 'dev->if_port' field. Its default
75 value is '4'. It may be overridden at boot-time using the third parameter
76 to the "ether=..." initialization.
77
78 The header file <atp.h> provides inline functions that encapsulate the
79 register and data access methods. These functions are hand-tuned to
80 generate reasonable object code. This header file also documents my
81 interpretations of the device registers.
82 */
83
84 #include <linux/kernel.h>
85 #include <linux/sched.h>
86 #include <linux/types.h>
87 #include <linux/fcntl.h>
88 #include <linux/interrupt.h>
89 #include <linux/ptrace.h>
90 #include <linux/ioport.h>
91 #include <linux/in.h>
92 #include <linux/malloc.h>
93 #include <linux/string.h>
94 #include <asm/system.h>
95 #include <asm/bitops.h>
96 #include <asm/io.h>
97 #include <asm/dma.h>
98 #include <linux/errno.h>
99
100 #include <linux/netdevice.h>
101 #include <linux/etherdevice.h>
102 #include <linux/skbuff.h>
103
104 #include "atp.h"
105
106 /* use 0 for production, 1 for verification, >2 for debug */
107 #ifndef NET_DEBUG
108 #define NET_DEBUG 1
109 #endif
110 static unsigned int net_debug = NET_DEBUG;
111
112 /* The number of low I/O ports used by the ethercard. */
113 #define ETHERCARD_TOTAL_SIZE 3
114
115 /* This code, written by wwc@super.org, resets the adapter every
116 TIMED_CHECKER ticks. This recovers from an unknown error which
117 hangs the device. */
118 #define TIMED_CHECKER (HZ/4)
119 #ifdef TIMED_CHECKER
120 #include <linux/timer.h>
121 static void atp_timed_checker(unsigned long ignored);
122 static struct device *atp_timed_dev;
123 static struct timer_list atp_timer = {NULL, NULL, 0, 0, atp_timed_checker};
124 #endif
125
126 /* Index to functions, as function prototypes. */
127
128 extern int atp_probe(struct device *dev);
129
130 static int atp_probe1(struct device *dev, short ioaddr);
131 static void get_node_ID(struct device *dev);
132 static unsigned short eeprom_op(short ioaddr, unsigned int cmd);
133 static int net_open(struct device *dev);
134 static void hardware_init(struct device *dev);
135 static void write_packet(short ioaddr, int length, unsigned char *packet, int mode);
136 static void trigger_send(short ioaddr, int length);
137 static int net_send_packet(struct sk_buff *skb, struct device *dev);
138 static void net_interrupt(int irq, struct pt_regs *regs);
139 static void net_rx(struct device *dev);
140 static void read_block(short ioaddr, int length, unsigned char *buffer, int data_mode);
141 static int net_close(struct device *dev);
142 static struct enet_statistics *net_get_stats(struct device *dev);
143 static void set_multicast_list(struct device *dev, int num_addrs, void *addrs);
144
145
146 /* Check for a network adapter of this type, and return '0' iff one exists.
147 If dev->base_addr == 0, probe all likely locations.
148 If dev->base_addr == 1, always return failure.
149 If dev->base_addr == 2, allocate space for the device and return success
150 (detachable devices only).
151 */
152 int
153 atp_init(struct device *dev)
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*/
154 {
155 int *port, ports[] = {0x378, 0x278, 0x3bc, 0};
156 int base_addr = dev->base_addr;
157
158 if (base_addr > 0x1ff) /* Check a single specified location. */
159 return atp_probe1(dev, base_addr);
160 else if (base_addr == 1) /* Don't probe at all. */
161 return ENXIO;
162
163 for (port = ports; *port; port++) {
164 int ioaddr = *port;
165 outb(0x57, ioaddr + PAR_DATA);
166 if (inb(ioaddr + PAR_DATA) != 0x57)
167 continue;
168 if (atp_probe1(dev, ioaddr) == 0)
169 return 0;
170 }
171
172 return ENODEV;
173 }
174
175 static int atp_probe1(struct device *dev, short ioaddr)
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176 {
177 int saved_ctrl_reg, status;
178
179 outb(0xff, ioaddr + PAR_DATA);
180 /* Save the original value of the Control register, in case we guessed
181 wrong. */
182 saved_ctrl_reg = inb(ioaddr + PAR_CONTROL);
183 /* IRQEN=0, SLCTB=high INITB=high, AUTOFDB=high, STBB=high. */
184 outb(0x04, ioaddr + PAR_CONTROL);
185 write_reg_high(ioaddr, CMR1, CMR1h_RESET);
186 eeprom_delay(2048);
187 status = read_nibble(ioaddr, CMR1);
188
189 if ((status & 0x78) != 0x08) {
190 /* The pocket adapter probe failed, restore the control register. */
191 outb(saved_ctrl_reg, ioaddr + PAR_CONTROL);
192 return 1;
193 }
194 status = read_nibble(ioaddr, CMR2_h);
195 if ((status & 0x78) != 0x10) {
196 outb(saved_ctrl_reg, ioaddr + PAR_CONTROL);
197 return 1;
198 }
199 /* Find the IRQ used by triggering an interrupt. */
200 write_reg_byte(ioaddr, CMR2, 0x01); /* No accept mode, IRQ out. */
201 write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); /* Enable Tx and Rx. */
202
203 /* Omit autoIRQ routine for now. Use "table lookup" instead. Uhgggh. */
204 if (ioaddr == 0x378)
205 dev->irq = 7;
206 else
207 dev->irq = 5;
208 write_reg_high(ioaddr, CMR1, CMR1h_TxRxOFF); /* Disable Tx and Rx units. */
209 write_reg(ioaddr, CMR2, CMR2_NULL);
210
211 dev->base_addr = ioaddr;
212
213 /* Read the station address PROM. */
214 get_node_ID(dev);
215
216 printk("%s: Pocket adapter found at %#3x, IRQ %d, SAPROM "
217 "%02X:%02X:%02X:%02X:%02X:%02X.\n", dev->name, dev->base_addr,
218 dev->irq, dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
219 dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
220
221 /* Leave the hardware in a reset state. */
222 write_reg_high(ioaddr, CMR1, CMR1h_RESET);
223
224 if (net_debug)
225 printk(version);
226
227 /* Initialize the device structure. */
228 ether_setup(dev);
229 dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL);
230 memset(dev->priv, 0, sizeof(struct net_local));
231
232
233 {
234 struct net_local *lp = (struct net_local *)dev->priv;
235 lp->addr_mode = CMR2h_Normal;
236 }
237
238 /* For the ATP adapter the "if_port" is really the data transfer mode. */
239 dev->if_port = (dev->mem_start & 0xf) ? dev->mem_start & 0x7 : 4;
240 if (dev->mem_end & 0xf)
241 net_debug = dev->mem_end & 7;
242
243 dev->open = net_open;
244 dev->stop = net_close;
245 dev->hard_start_xmit = net_send_packet;
246 dev->get_stats = net_get_stats;
247 dev->set_multicast_list = &set_multicast_list;
248
249 #ifdef TIMED_CHECKER
250 del_timer(&atp_timer);
251 atp_timer.expires = TIMED_CHECKER;
252 atp_timed_dev = dev;
253 add_timer(&atp_timer);
254 #endif
255 return 0;
256 }
257
258 /* Read the station address PROM, usually a word-wide EEPROM. */
259 static void get_node_ID(struct device *dev)
/* */
260 {
261 short ioaddr = dev->base_addr;
262 int sa_offset = 0;
263 int i;
264
265 write_reg(ioaddr, CMR2, CMR2_EEPROM); /* Point to the EEPROM control registers. */
266
267 /* Some adapters have the station address at offset 15 instead of offset
268 zero. Check for it, and fix it if needed. */
269 if (eeprom_op(ioaddr, EE_READ(0)) == 0xffff)
270 sa_offset = 15;
271
272 for (i = 0; i < 3; i++)
273 ((unsigned short *)dev->dev_addr)[i] =
274 ntohs(eeprom_op(ioaddr, EE_READ(sa_offset + i)));
275
276 write_reg(ioaddr, CMR2, CMR2_NULL);
277 }
278
279 /*
280 An EEPROM read command starts by shifting out 0x60+address, and then
281 shifting in the serial data. See the NatSemi databook for details.
282 * ________________
283 * CS : __|
284 * ___ ___
285 * CLK: ______| |___| |
286 * __ _______ _______
287 * DI : __X_______X_______X
288 * DO : _________X_______X
289 */
290
291 static unsigned short eeprom_op(short ioaddr, unsigned int cmd)
/* */
292 {
293 unsigned eedata_out = 0;
294 int num_bits = EE_CMD_SIZE;
295
296 while (--num_bits >= 0) {
297 char outval = test_bit(num_bits, &cmd) ? EE_DATA_WRITE : 0;
298 write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_LOW);
299 eeprom_delay(5);
300 write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_HIGH);
301 eedata_out <<= 1;
302 if (read_nibble(ioaddr, PROM_DATA) & EE_DATA_READ)
303 eedata_out++;
304 eeprom_delay(5);
305 }
306 write_reg_high(ioaddr, PROM_CMD, EE_CLK_LOW & ~EE_CS);
307 return eedata_out;
308 }
309
310
311 /* Open/initialize the board. This is called (in the current kernel)
312 sometime after booting when the 'ifconfig' program is run.
313
314 This routine sets everything up anew at each open, even
315 registers that "should" only need to be set once at boot, so that
316 there is non-reboot way to recover if something goes wrong.
317
318 This is an attachable device: if there is no dev->priv entry then it wasn't
319 probed for at boot-time, and we need to probe for it again.
320 */
321 static int net_open(struct device *dev)
/* */
322 {
323
324 /* The interrupt line is turned off (tri-stated) when the device isn't in
325 use. That's especially important for "attached" interfaces where the
326 port or interrupt may be shared. */
327 if (irq2dev_map[dev->irq] != 0
328 || (irq2dev_map[dev->irq] = dev) == 0
329 || request_irq(dev->irq, &net_interrupt, 0, "ATP")) {
330 return -EAGAIN;
331 }
332
333 hardware_init(dev);
334 dev->start = 1;
335 return 0;
336 }
337
338 /* This routine resets the hardware. We initialize everything, assuming that
339 the hardware may have been temporarily detached. */
340 static void hardware_init(struct device *dev)
/* */
341 {
342 struct net_local *lp = (struct net_local *)dev->priv;
343 int ioaddr = dev->base_addr;
344 int i;
345
346 write_reg_high(ioaddr, CMR1, CMR1h_RESET);
347
348 for (i = 0; i < 6; i++)
349 write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);
350
351 write_reg_high(ioaddr, CMR2, lp->addr_mode);
352
353 if (net_debug > 2) {
354 printk("%s: Reset: current Rx mode %d.\n", dev->name,
355 (read_nibble(ioaddr, CMR2_h) >> 3) & 0x0f);
356 }
357
358 write_reg(ioaddr, CMR2, CMR2_IRQOUT);
359 write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE);
360
361 /* Enable the interrupt line from the serial port. */
362 outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
363
364 /* Unmask the interesting interrupts. */
365 write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK);
366 write_reg_high(ioaddr, IMR, ISRh_RxErr);
367
368 lp->tx_unit_busy = 0;
369 lp->pac_cnt_in_tx_buf = 0;
370 lp->saved_tx_size = 0;
371
372 dev->tbusy = 0;
373 dev->interrupt = 0;
374 }
375
376 static void trigger_send(short ioaddr, int length)
/* */
377 {
378 write_reg_byte(ioaddr, TxCNT0, length & 0xff);
379 write_reg(ioaddr, TxCNT1, length >> 8);
380 write_reg(ioaddr, CMR1, CMR1_Xmit);
381 }
382
383 static void write_packet(short ioaddr, int length, unsigned char *packet, int data_mode)
/* */
384 {
385 length = (length + 1) & ~1; /* Round up to word length. */
386 outb(EOC+MAR, ioaddr + PAR_DATA);
387 if ((data_mode & 1) == 0) {
388 /* Write the packet out, starting with the write addr. */
389 outb(WrAddr+MAR, ioaddr + PAR_DATA);
390 do {
391 write_byte_mode0(ioaddr, *packet++);
392 } while (--length > 0) ;
393 } else {
394 /* Write the packet out in slow mode. */
395 unsigned char outbyte = *packet++;
396
397 outb(Ctrl_LNibWrite + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
398 outb(WrAddr+MAR, ioaddr + PAR_DATA);
399
400 outb((outbyte & 0x0f)|0x40, ioaddr + PAR_DATA);
401 outb(outbyte & 0x0f, ioaddr + PAR_DATA);
402 outbyte >>= 4;
403 outb(outbyte & 0x0f, ioaddr + PAR_DATA);
404 outb(Ctrl_HNibWrite + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
405 while (--length > 0)
406 write_byte_mode1(ioaddr, *packet++);
407 }
408 /* Terminate the Tx frame. End of write: ECB. */
409 outb(0xff, ioaddr + PAR_DATA);
410 outb(Ctrl_HNibWrite | Ctrl_SelData | Ctrl_IRQEN, ioaddr + PAR_CONTROL);
411 }
412
413 static int
414 net_send_packet(struct sk_buff *skb, struct device *dev)
/* */
415 {
416 struct net_local *lp = (struct net_local *)dev->priv;
417 int ioaddr = dev->base_addr;
418
419 if (dev->tbusy) {
420 /* If we get here, some higher level has decided we are broken.
421 There should really be a "kick me" function call instead. */
422 int tickssofar = jiffies - dev->trans_start;
423 if (tickssofar < 5)
424 return 1;
425 printk("%s: transmit timed out, %s?\n", dev->name,
426 inb(ioaddr + PAR_CONTROL) & 0x10 ? "network cable problem"
427 : "IRQ conflict");
428 lp->stats.tx_errors++;
429 /* Try to restart the adapter. */
430 hardware_init(dev);
431 dev->tbusy=0;
432 dev->trans_start = jiffies;
433 }
434
435 /* If some higher layer thinks we've missed an tx-done interrupt
436 we are passed NULL. Caution: dev_tint() handles the cli()/sti()
437 itself. */
438 if (skb == NULL) {
439 dev_tint(dev);
440 return 0;
441 }
442
443 /* Block a timer-based transmit from overlapping. This could better be
444 done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
445 if (set_bit(0, (void*)&dev->tbusy) != 0)
446 printk("%s: Transmitter access conflict.\n", dev->name);
447 else {
448 short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
449 unsigned char *buf = skb->data;
450 int flags;
451
452 /* Disable interrupts by writing 0x00 to the Interrupt Mask Register.
453 This sequence must not be interrupted by an incoming packet. */
454 save_flags(flags);
455 cli();
456 write_reg(ioaddr, IMR, 0);
457 write_reg_high(ioaddr, IMR, 0);
458 restore_flags(flags);
459
460 write_packet(ioaddr, length, buf, dev->if_port);
461
462 lp->pac_cnt_in_tx_buf++;
463 if (lp->tx_unit_busy == 0) {
464 trigger_send(ioaddr, length);
465 lp->saved_tx_size = 0; /* Redundant */
466 lp->re_tx = 0;
467 lp->tx_unit_busy = 1;
468 } else
469 lp->saved_tx_size = length;
470
471 dev->trans_start = jiffies;
472 /* Re-enable the LPT interrupts. */
473 write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK);
474 write_reg_high(ioaddr, IMR, ISRh_RxErr);
475 }
476
477 dev_kfree_skb (skb, FREE_WRITE);
478
479 return 0;
480 }
481
482 /* The typical workload of the driver:
483 Handle the network interface interrupts. */
484 static void
485 net_interrupt(int irq, struct pt_regs * regs)
/* */
486 {
487 struct device *dev = (struct device *)(irq2dev_map[irq]);
488 struct net_local *lp;
489 int ioaddr, status, boguscount = 20;
490 static int num_tx_since_rx = 0;
491
492 if (dev == NULL) {
493 printk ("ATP_interrupt(): irq %d for unknown device.\n", irq);
494 return;
495 }
496 dev->interrupt = 1;
497
498 ioaddr = dev->base_addr;
499 lp = (struct net_local *)dev->priv;
500
501 /* Disable additional spurious interrupts. */
502 outb(Ctrl_SelData, ioaddr + PAR_CONTROL);
503
504 /* The adapter's output is currently the IRQ line, switch it to data. */
505 write_reg(ioaddr, CMR2, CMR2_NULL);
506 write_reg(ioaddr, IMR, 0);
507
508 if (net_debug > 5) printk("%s: In interrupt ", dev->name);
509 while (--boguscount > 0) {
510 status = read_nibble(ioaddr, ISR);
511 if (net_debug > 5) printk("loop status %02x..", status);
512
513 if (status & (ISR_RxOK<<3)) {
514 write_reg(ioaddr, ISR, ISR_RxOK); /* Clear the Rx interrupt. */
515 do {
516 int read_status = read_nibble(ioaddr, CMR1);
517 if (net_debug > 6)
518 printk("handling Rx packet %02x..", read_status);
519 /* We acknowledged the normal Rx interrupt, so if the interrupt
520 is still outstanding we must have a Rx error. */
521 if (read_status & (CMR1_IRQ << 3)) { /* Overrun. */
522 lp->stats.rx_over_errors++;
523 /* Set to no-accept mode long enough to remove a packet. */
524 write_reg_high(ioaddr, CMR2, CMR2h_OFF);
525 net_rx(dev);
526 /* Clear the interrupt and return to normal Rx mode. */
527 write_reg_high(ioaddr, ISR, ISRh_RxErr);
528 write_reg_high(ioaddr, CMR2, lp->addr_mode);
529 } else if ((read_status & (CMR1_BufEnb << 3)) == 0) {
530 net_rx(dev);
531 dev->last_rx = jiffies;
532 num_tx_since_rx = 0;
533 } else
534 break;
535 } while (--boguscount > 0);
536 } else if (status & ((ISR_TxErr + ISR_TxOK)<<3)) {
537 if (net_debug > 6) printk("handling Tx done..");
538 /* Clear the Tx interrupt. We should check for too many failures
539 and reinitialize the adapter. */
540 write_reg(ioaddr, ISR, ISR_TxErr + ISR_TxOK);
541 if (status & (ISR_TxErr<<3)) {
542 lp->stats.collisions++;
543 if (++lp->re_tx > 15) {
544 lp->stats.tx_aborted_errors++;
545 hardware_init(dev);
546 break;
547 }
548 /* Attempt to retransmit. */
549 if (net_debug > 6) printk("attempting to ReTx");
550 write_reg(ioaddr, CMR1, CMR1_ReXmit + CMR1_Xmit);
551 } else {
552 /* Finish up the transmit. */
553 lp->stats.tx_packets++;
554 lp->pac_cnt_in_tx_buf--;
555 if ( lp->saved_tx_size) {
556 trigger_send(ioaddr, lp->saved_tx_size);
557 lp->saved_tx_size = 0;
558 lp->re_tx = 0;
559 } else
560 lp->tx_unit_busy = 0;
561 dev->tbusy = 0;
562 mark_bh(NET_BH); /* Inform upper layers. */
563 }
564 num_tx_since_rx++;
565 } else if (num_tx_since_rx > 8
566 && jiffies > dev->last_rx + 100) {
567 if (net_debug > 2)
568 printk("%s: Missed packet? No Rx after %d Tx and %ld jiffies"
569 " status %02x CMR1 %02x.\n", dev->name,
570 num_tx_since_rx, jiffies - dev->last_rx, status,
571 (read_nibble(ioaddr, CMR1) >> 3) & 15);
572 lp->stats.rx_missed_errors++;
573 hardware_init(dev);
574 num_tx_since_rx = 0;
575 break;
576 } else
577 break;
578 }
579
580 /* This following code fixes a rare (and very difficult to track down)
581 problem where the adapter forgets its ethernet address. */
582 {
583 int i;
584 for (i = 0; i < 6; i++)
585 write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);
586 #ifdef TIMED_CHECKER
587 del_timer(&atp_timer);
588 atp_timer.expires = TIMED_CHECKER;
589 add_timer(&atp_timer);
590 #endif
591 }
592
593 /* Tell the adapter that it can go back to using the output line as IRQ. */
594 write_reg(ioaddr, CMR2, CMR2_IRQOUT);
595 /* Enable the physical interrupt line, which is sure to be low until.. */
596 outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
597 /* .. we enable the interrupt sources. */
598 write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK);
599 write_reg_high(ioaddr, IMR, ISRh_RxErr); /* Hmmm, really needed? */
600
601 if (net_debug > 5) printk("exiting interrupt.\n");
602
603 dev->interrupt = 0;
604
605 return;
606 }
607
608 #ifdef TIMED_CHECKER
609 /* This following code fixes a rare (and very difficult to track down)
610 problem where the adapter forgets its ethernet address. */
611 static void atp_timed_checker(unsigned long ignored)
/* */
612 {
613 int i;
614 int ioaddr = atp_timed_dev->base_addr;
615
616 if (!atp_timed_dev->interrupt)
617 {
618 for (i = 0; i < 6; i++)
619 #if 0
620 if (read_cmd_byte(ioaddr, PAR0 + i) != atp_timed_dev->dev_addr[i])
621 {
622 struct net_local *lp = (struct net_local *)atp_timed_dev->priv;
623 write_reg_byte(ioaddr, PAR0 + i, atp_timed_dev->dev_addr[i]);
624 if (i == 2)
625 lp->stats.tx_errors++;
626 else if (i == 3)
627 lp->stats.tx_dropped++;
628 else if (i == 4)
629 lp->stats.collisions++;
630 else
631 lp->stats.rx_errors++;
632 }
633 #else
634 write_reg_byte(ioaddr, PAR0 + i, atp_timed_dev->dev_addr[i]);
635 #endif
636 }
637 del_timer(&atp_timer);
638 atp_timer.expires = TIMED_CHECKER;
639 add_timer(&atp_timer);
640 }
641 #endif
642
643 /* We have a good packet(s), get it/them out of the buffers. */
644 static void net_rx(struct device *dev)
/* */
645 {
646 struct net_local *lp = (struct net_local *)dev->priv;
647 int ioaddr = dev->base_addr;
648 #ifdef notdef
649 ushort header[4];
650 #else
651 struct rx_header rx_head;
652 #endif
653
654 /* Process the received packet. */
655 outb(EOC+MAR, ioaddr + PAR_DATA);
656 read_block(ioaddr, 8, (unsigned char*)&rx_head, dev->if_port);
657 if (net_debug > 5)
658 printk(" rx_count %04x %04x %04x %04x..", rx_head.pad,
659 rx_head.rx_count, rx_head.rx_status, rx_head.cur_addr);
660 if ((rx_head.rx_status & 0x77) != 0x01) {
661 lp->stats.rx_errors++;
662 /* Ackkk! I don't have any documentation on what the error bits mean!
663 The best I can do is slap the device around a bit. */
664 if (net_debug > 3) printk("%s: Unknown ATP Rx error %04x.\n",
665 dev->name, rx_head.rx_status);
666 hardware_init(dev);
667 return;
668 } else {
669 /* Malloc up new buffer. */
670 int pkt_len = (rx_head.rx_count & 0x7ff) - 4; /* The "-4" is omits the FCS (CRC). */
671 struct sk_buff *skb;
672
673 skb = dev_alloc_skb(pkt_len);
674 if (skb == NULL) {
675 printk("%s: Memory squeeze, dropping packet.\n", dev->name);
676 lp->stats.rx_dropped++;
677 goto done;
678 }
679 skb->dev = dev;
680
681 read_block(ioaddr, pkt_len, skb_put(skb,pkt_len), dev->if_port);
682
683 if (net_debug > 6) {
684 unsigned char *data = skb->data;
685 printk(" data %02x%02x%02x %02x%02x%02x %02x%02x%02x"
686 "%02x%02x%02x %02x%02x..",
687 data[0], data[1], data[2], data[3], data[4], data[5],
688 data[6], data[7], data[8], data[9], data[10], data[11],
689 data[12], data[13]);
690 }
691
692 skb->protocol=eth_type_trans(skb,dev);
693 netif_rx(skb);
694 lp->stats.rx_packets++;
695 }
696 done:
697 write_reg(ioaddr, CMR1, CMR1_NextPkt);
698 return;
699 }
700
701 static void read_block(short ioaddr, int length, unsigned char *p, int data_mode)
/* */
702 {
703
704 if (data_mode <= 3) { /* Mode 0 or 1 */
705 outb(Ctrl_LNibRead, ioaddr + PAR_CONTROL);
706 outb(length == 8 ? RdAddr | HNib | MAR : RdAddr | MAR,
707 ioaddr + PAR_DATA);
708 if (data_mode <= 1) { /* Mode 0 or 1 */
709 do *p++ = read_byte_mode0(ioaddr); while (--length > 0);
710 } else /* Mode 2 or 3 */
711 do *p++ = read_byte_mode2(ioaddr); while (--length > 0);
712 } else if (data_mode <= 5)
713 do *p++ = read_byte_mode4(ioaddr); while (--length > 0);
714 else
715 do *p++ = read_byte_mode6(ioaddr); while (--length > 0);
716
717 outb(EOC+HNib+MAR, ioaddr + PAR_DATA);
718 outb(Ctrl_SelData, ioaddr + PAR_CONTROL);
719 }
720
721 /* The inverse routine to net_open(). */
722 static int
723 net_close(struct device *dev)
/* */
724 {
725 struct net_local *lp = (struct net_local *)dev->priv;
726 int ioaddr = dev->base_addr;
727
728 dev->tbusy = 1;
729 dev->start = 0;
730
731 /* Flush the Tx and disable Rx here. */
732 lp->addr_mode = CMR2h_OFF;
733 write_reg_high(ioaddr, CMR2, CMR2h_OFF);
734
735 /* Free the IRQ line. */
736 outb(0x00, ioaddr + PAR_CONTROL);
737 free_irq(dev->irq);
738 irq2dev_map[dev->irq] = 0;
739
740 /* Leave the hardware in a reset state. */
741 write_reg_high(ioaddr, CMR1, CMR1h_RESET);
742
743 return 0;
744 }
745
746 /* Get the current statistics. This may be called with the card open or
747 closed. */
748 static struct enet_statistics *
749 net_get_stats(struct device *dev)
/* */
750 {
751 struct net_local *lp = (struct net_local *)dev->priv;
752 return &lp->stats;
753 }
754
755 /* Set or clear the multicast filter for this adapter.
756 num_addrs == -1 Promiscuous mode, receive all packets
757 num_addrs == 0 Normal mode, clear multicast list
758 num_addrs > 0 Multicast mode, receive normal and MC packets, and do
759 best-effort filtering.
760 */
761 static void
762 set_multicast_list(struct device *dev, int num_addrs, void *addrs)
/* ![[last]](../icons/n_last.png)
*/
763 {
764 struct net_local *lp = (struct net_local *)dev->priv;
765 short ioaddr = dev->base_addr;
766 lp->addr_mode = num_addrs ? CMR2h_PROMISC : CMR2h_Normal;
767 write_reg_high(ioaddr, CMR2, lp->addr_mode);
768 }
769
770 /*
771 * Local variables:
772 * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c atp.c"
773 * version-control: t
774 * kept-new-versions: 5
775 * tab-width: 4
776 * End:
777 */
![[bottom]](../icons/n_bottom.png){kind=icon}
*/