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1/* atp.c: Attached (pocket) ethernet adapter driver for linux. */
2/*
3 This is a driver for commonly OEM pocket (parallel port)
4 ethernet adapters based on the Realtek RTL8002 and RTL8012 chips.
5
6 Written 1993-2000 by Donald Becker.
7
8 This software may be used and distributed according to the terms of
9 the GNU General Public License (GPL), incorporated herein by reference.
10 Drivers based on or derived from this code fall under the GPL and must
11 retain the authorship, copyright and license notice. This file is not
12 a complete program and may only be used when the entire operating
13 system is licensed under the GPL.
14
15 Copyright 1993 United States Government as represented by the Director,
16 National Security Agency. Copyright 1994-2000 retained by the original
17 author, Donald Becker. The timer-based reset code was supplied in 1995
18 by Bill Carlson, wwc@super.org.
19
20 The author may be reached as becker@scyld.com, or C/O
21 Scyld Computing Corporation
22 410 Severn Ave., Suite 210
23 Annapolis MD 21403
24
25 Support information and updates available at
26 http://www.scyld.com/network/atp.html
27
28
29 Modular support/softnet added by Alan Cox.
30 _bit abuse fixed up by Alan Cox
31
32*/
33
34static const char version[] =
35"atp.c:v1.09=ac 2002/10/01 Donald Becker <becker@scyld.com>\n";
36
37/* The user-configurable values.
38 These may be modified when a driver module is loaded.*/
39
40static int debug = 1; /* 1 normal messages, 0 quiet .. 7 verbose. */
41#define net_debug debug
42
43/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
44static int max_interrupt_work = 15;
45
46#define NUM_UNITS 2
47/* The standard set of ISA module parameters. */
48static int io[NUM_UNITS];
49static int irq[NUM_UNITS];
50static int xcvr[NUM_UNITS]; /* The data transfer mode. */
51
52/* Operational parameters that are set at compile time. */
53
54/* Time in jiffies before concluding the transmitter is hung. */
55#define TX_TIMEOUT (400*HZ/1000)
56
57/*
58 This file is a device driver for the RealTek (aka AT-Lan-Tec) pocket
59 ethernet adapter. This is a common low-cost OEM pocket ethernet
60 adapter, sold under many names.
61
62 Sources:
63 This driver was written from the packet driver assembly code provided by
64 Vincent Bono of AT-Lan-Tec. Ever try to figure out how a complicated
65 device works just from the assembly code? It ain't pretty. The following
66 description is written based on guesses and writing lots of special-purpose
67 code to test my theorized operation.
68
69 In 1997 Realtek made available the documentation for the second generation
70 RTL8012 chip, which has lead to several driver improvements.
71 http://www.realtek.com.tw/
72
73 Theory of Operation
74
75 The RTL8002 adapter seems to be built around a custom spin of the SEEQ
76 controller core. It probably has a 16K or 64K internal packet buffer, of
77 which the first 4K is devoted to transmit and the rest to receive.
78 The controller maintains the queue of received packet and the packet buffer
79 access pointer internally, with only 'reset to beginning' and 'skip to next
80 packet' commands visible. The transmit packet queue holds two (or more?)
81 packets: both 'retransmit this packet' (due to collision) and 'transmit next
82 packet' commands must be started by hand.
83
84 The station address is stored in a standard bit-serial EEPROM which must be
85 read (ughh) by the device driver. (Provisions have been made for
86 substituting a 74S288 PROM, but I haven't gotten reports of any models
87 using it.) Unlike built-in devices, a pocket adapter can temporarily lose
88 power without indication to the device driver. The major effect is that
89 the station address, receive filter (promiscuous, etc.) and transceiver
90 must be reset.
91
92 The controller itself has 16 registers, some of which use only the lower
93 bits. The registers are read and written 4 bits at a time. The four bit
94 register address is presented on the data lines along with a few additional
95 timing and control bits. The data is then read from status port or written
96 to the data port.
97
98 Correction: the controller has two banks of 16 registers. The second
99 bank contains only the multicast filter table (now used) and the EEPROM
100 access registers.
101
102 Since the bulk data transfer of the actual packets through the slow
103 parallel port dominates the driver's running time, four distinct data
104 (non-register) transfer modes are provided by the adapter, two in each
105 direction. In the first mode timing for the nibble transfers is
106 provided through the data port. In the second mode the same timing is
107 provided through the control port. In either case the data is read from
108 the status port and written to the data port, just as it is accessing
109 registers.
110
111 In addition to the basic data transfer methods, several more are modes are
112 created by adding some delay by doing multiple reads of the data to allow
113 it to stabilize. This delay seems to be needed on most machines.
114
115 The data transfer mode is stored in the 'dev->if_port' field. Its default
116 value is '4'. It may be overridden at boot-time using the third parameter
117 to the "ether=..." initialization.
118
119 The header file <atp.h> provides inline functions that encapsulate the
120 register and data access methods. These functions are hand-tuned to
121 generate reasonable object code. This header file also documents my
122 interpretations of the device registers.
123*/
124
125#include <linux/kernel.h>
126#include <linux/module.h>
127#include <linux/types.h>
128#include <linux/fcntl.h>
129#include <linux/interrupt.h>
130#include <linux/ioport.h>
131#include <linux/in.h>
132#include <linux/string.h>
133#include <linux/errno.h>
134#include <linux/init.h>
135#include <linux/crc32.h>
136#include <linux/netdevice.h>
137#include <linux/etherdevice.h>
138#include <linux/skbuff.h>
139#include <linux/spinlock.h>
140#include <linux/delay.h>
141#include <linux/bitops.h>
142
143#include <asm/io.h>
144#include <asm/dma.h>
145
146#include "atp.h"
147
148MODULE_AUTHOR("Donald Becker <becker@scyld.com>");
149MODULE_DESCRIPTION("RealTek RTL8002/8012 parallel port Ethernet driver");
150MODULE_LICENSE("GPL");
151
152module_param(max_interrupt_work, int, 0);
153module_param(debug, int, 0);
154module_param_hw_array(io, int, ioport, NULL, 0);
155module_param_hw_array(irq, int, irq, NULL, 0);
156module_param_array(xcvr, int, NULL, 0);
157MODULE_PARM_DESC(max_interrupt_work, "ATP maximum events handled per interrupt");
158MODULE_PARM_DESC(debug, "ATP debug level (0-7)");
159MODULE_PARM_DESC(io, "ATP I/O base address(es)");
160MODULE_PARM_DESC(irq, "ATP IRQ number(s)");
161MODULE_PARM_DESC(xcvr, "ATP transceiver(s) (0=internal, 1=external)");
162
163/* The number of low I/O ports used by the ethercard. */
164#define ETHERCARD_TOTAL_SIZE 3
165
166/* Sequence to switch an 8012 from printer mux to ethernet mode. */
167static char mux_8012[] = { 0xff, 0xf7, 0xff, 0xfb, 0xf3, 0xfb, 0xff, 0xf7,};
168
169struct net_local {
170 spinlock_t lock;
171 struct net_device *next_module;
172 struct timer_list timer; /* Media selection timer. */
173 struct net_device *dev; /* Timer dev. */
174 unsigned long last_rx_time; /* Last Rx, in jiffies, to handle Rx hang. */
175 int saved_tx_size;
176 unsigned int tx_unit_busy:1;
177 unsigned char re_tx, /* Number of packet retransmissions. */
178 addr_mode, /* Current Rx filter e.g. promiscuous, etc. */
179 pac_cnt_in_tx_buf;
180};
181
182/* This code, written by wwc@super.org, resets the adapter every
183 TIMED_CHECKER ticks. This recovers from an unknown error which
184 hangs the device. */
185#define TIMED_CHECKER (HZ/4)
186#ifdef TIMED_CHECKER
187#include <linux/timer.h>
188static void atp_timed_checker(struct timer_list *t);
189#endif
190
191/* Index to functions, as function prototypes. */
192
193static int atp_probe1(long ioaddr);
194static void get_node_ID(struct net_device *dev);
195static unsigned short eeprom_op(long ioaddr, unsigned int cmd);
196static int net_open(struct net_device *dev);
197static void hardware_init(struct net_device *dev);
198static void write_packet(long ioaddr, int length, unsigned char *packet, int pad, int mode);
199static void trigger_send(long ioaddr, int length);
200static netdev_tx_t atp_send_packet(struct sk_buff *skb,
201 struct net_device *dev);
202static irqreturn_t atp_interrupt(int irq, void *dev_id);
203static void net_rx(struct net_device *dev);
204static void read_block(long ioaddr, int length, unsigned char *buffer, int data_mode);
205static int net_close(struct net_device *dev);
206static void set_rx_mode(struct net_device *dev);
207static void tx_timeout(struct net_device *dev);
208
209
210/* A list of all installed ATP devices, for removing the driver module. */
211static struct net_device *root_atp_dev;
212
213/* Check for a network adapter of this type, and return '0' iff one exists.
214 If dev->base_addr == 0, probe all likely locations.
215 If dev->base_addr == 1, always return failure.
216 If dev->base_addr == 2, allocate space for the device and return success
217 (detachable devices only).
218
219 FIXME: we should use the parport layer for this
220 */
221static int __init atp_init(void)
222{
223 int *port, ports[] = {0x378, 0x278, 0x3bc, 0};
224 int base_addr = io[0];
225
226 if (base_addr > 0x1ff) /* Check a single specified location. */
227 return atp_probe1(base_addr);
228 else if (base_addr == 1) /* Don't probe at all. */
229 return -ENXIO;
230
231 for (port = ports; *port; port++) {
232 long ioaddr = *port;
233 outb(0x57, ioaddr + PAR_DATA);
234 if (inb(ioaddr + PAR_DATA) != 0x57)
235 continue;
236 if (atp_probe1(ioaddr) == 0)
237 return 0;
238 }
239
240 return -ENODEV;
241}
242
243static const struct net_device_ops atp_netdev_ops = {
244 .ndo_open = net_open,
245 .ndo_stop = net_close,
246 .ndo_start_xmit = atp_send_packet,
247 .ndo_set_rx_mode = set_rx_mode,
248 .ndo_tx_timeout = tx_timeout,
249 .ndo_set_mac_address = eth_mac_addr,
250 .ndo_validate_addr = eth_validate_addr,
251};
252
253static int __init atp_probe1(long ioaddr)
254{
255 struct net_device *dev = NULL;
256 struct net_local *lp;
257 int saved_ctrl_reg, status, i;
258 int res;
259
260 outb(0xff, ioaddr + PAR_DATA);
261 /* Save the original value of the Control register, in case we guessed
262 wrong. */
263 saved_ctrl_reg = inb(ioaddr + PAR_CONTROL);
264 if (net_debug > 3)
265 printk("atp: Control register was %#2.2x.\n", saved_ctrl_reg);
266 /* IRQEN=0, SLCTB=high INITB=high, AUTOFDB=high, STBB=high. */
267 outb(0x04, ioaddr + PAR_CONTROL);
268#ifndef final_version
269 if (net_debug > 3) {
270 /* Turn off the printer multiplexer on the 8012. */
271 for (i = 0; i < 8; i++)
272 outb(mux_8012[i], ioaddr + PAR_DATA);
273 write_reg(ioaddr, MODSEL, 0x00);
274 printk("atp: Registers are ");
275 for (i = 0; i < 32; i++)
276 printk(" %2.2x", read_nibble(ioaddr, i));
277 printk(".\n");
278 }
279#endif
280 /* Turn off the printer multiplexer on the 8012. */
281 for (i = 0; i < 8; i++)
282 outb(mux_8012[i], ioaddr + PAR_DATA);
283 write_reg_high(ioaddr, CMR1, CMR1h_RESET);
284 /* udelay() here? */
285 status = read_nibble(ioaddr, CMR1);
286
287 if (net_debug > 3) {
288 printk(KERN_DEBUG "atp: Status nibble was %#2.2x..", status);
289 for (i = 0; i < 32; i++)
290 printk(" %2.2x", read_nibble(ioaddr, i));
291 printk("\n");
292 }
293
294 if ((status & 0x78) != 0x08) {
295 /* The pocket adapter probe failed, restore the control register. */
296 outb(saved_ctrl_reg, ioaddr + PAR_CONTROL);
297 return -ENODEV;
298 }
299 status = read_nibble(ioaddr, CMR2_h);
300 if ((status & 0x78) != 0x10) {
301 outb(saved_ctrl_reg, ioaddr + PAR_CONTROL);
302 return -ENODEV;
303 }
304
305 dev = alloc_etherdev(sizeof(struct net_local));
306 if (!dev)
307 return -ENOMEM;
308
309 /* Find the IRQ used by triggering an interrupt. */
310 write_reg_byte(ioaddr, CMR2, 0x01); /* No accept mode, IRQ out. */
311 write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); /* Enable Tx and Rx. */
312
313 /* Omit autoIRQ routine for now. Use "table lookup" instead. Uhgggh. */
314 if (irq[0])
315 dev->irq = irq[0];
316 else if (ioaddr == 0x378)
317 dev->irq = 7;
318 else
319 dev->irq = 5;
320 write_reg_high(ioaddr, CMR1, CMR1h_TxRxOFF); /* Disable Tx and Rx units. */
321 write_reg(ioaddr, CMR2, CMR2_NULL);
322
323 dev->base_addr = ioaddr;
324
325 /* Read the station address PROM. */
326 get_node_ID(dev);
327
328#ifndef MODULE
329 if (net_debug)
330 printk(KERN_INFO "%s", version);
331#endif
332
333 printk(KERN_NOTICE "%s: Pocket adapter found at %#3lx, IRQ %d, "
334 "SAPROM %pM.\n",
335 dev->name, dev->base_addr, dev->irq, dev->dev_addr);
336
337 /* Reset the ethernet hardware and activate the printer pass-through. */
338 write_reg_high(ioaddr, CMR1, CMR1h_RESET | CMR1h_MUX);
339
340 lp = netdev_priv(dev);
341 lp->addr_mode = CMR2h_Normal;
342 spin_lock_init(&lp->lock);
343
344 /* For the ATP adapter the "if_port" is really the data transfer mode. */
345 if (xcvr[0])
346 dev->if_port = xcvr[0];
347 else
348 dev->if_port = (dev->mem_start & 0xf) ? (dev->mem_start & 0x7) : 4;
349 if (dev->mem_end & 0xf)
350 net_debug = dev->mem_end & 7;
351
352 dev->netdev_ops = &atp_netdev_ops;
353 dev->watchdog_timeo = TX_TIMEOUT;
354
355 res = register_netdev(dev);
356 if (res) {
357 free_netdev(dev);
358 return res;
359 }
360
361 lp->next_module = root_atp_dev;
362 root_atp_dev = dev;
363
364 return 0;
365}
366
367/* Read the station address PROM, usually a word-wide EEPROM. */
368static void __init get_node_ID(struct net_device *dev)
369{
370 long ioaddr = dev->base_addr;
371 int sa_offset = 0;
372 int i;
373
374 write_reg(ioaddr, CMR2, CMR2_EEPROM); /* Point to the EEPROM control registers. */
375
376 /* Some adapters have the station address at offset 15 instead of offset
377 zero. Check for it, and fix it if needed. */
378 if (eeprom_op(ioaddr, EE_READ(0)) == 0xffff)
379 sa_offset = 15;
380
381 for (i = 0; i < 3; i++)
382 ((__be16 *)dev->dev_addr)[i] =
383 cpu_to_be16(eeprom_op(ioaddr, EE_READ(sa_offset + i)));
384
385 write_reg(ioaddr, CMR2, CMR2_NULL);
386}
387
388/*
389 An EEPROM read command starts by shifting out 0x60+address, and then
390 shifting in the serial data. See the NatSemi databook for details.
391 * ________________
392 * CS : __|
393 * ___ ___
394 * CLK: ______| |___| |
395 * __ _______ _______
396 * DI : __X_______X_______X
397 * DO : _________X_______X
398 */
399
400static unsigned short __init eeprom_op(long ioaddr, u32 cmd)
401{
402 unsigned eedata_out = 0;
403 int num_bits = EE_CMD_SIZE;
404
405 while (--num_bits >= 0) {
406 char outval = (cmd & (1<<num_bits)) ? EE_DATA_WRITE : 0;
407 write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_LOW);
408 write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_HIGH);
409 eedata_out <<= 1;
410 if (read_nibble(ioaddr, PROM_DATA) & EE_DATA_READ)
411 eedata_out++;
412 }
413 write_reg_high(ioaddr, PROM_CMD, EE_CLK_LOW & ~EE_CS);
414 return eedata_out;
415}
416
417
418/* Open/initialize the board. This is called (in the current kernel)
419 sometime after booting when the 'ifconfig' program is run.
420
421 This routine sets everything up anew at each open, even
422 registers that "should" only need to be set once at boot, so that
423 there is non-reboot way to recover if something goes wrong.
424
425 This is an attachable device: if there is no private entry then it wasn't
426 probed for at boot-time, and we need to probe for it again.
427 */
428static int net_open(struct net_device *dev)
429{
430 struct net_local *lp = netdev_priv(dev);
431 int ret;
432
433 /* The interrupt line is turned off (tri-stated) when the device isn't in
434 use. That's especially important for "attached" interfaces where the
435 port or interrupt may be shared. */
436 ret = request_irq(dev->irq, atp_interrupt, 0, dev->name, dev);
437 if (ret)
438 return ret;
439
440 hardware_init(dev);
441
442 lp->dev = dev;
443 timer_setup(&lp->timer, atp_timed_checker, 0);
444 lp->timer.expires = jiffies + TIMED_CHECKER;
445 add_timer(&lp->timer);
446
447 netif_start_queue(dev);
448 return 0;
449}
450
451/* This routine resets the hardware. We initialize everything, assuming that
452 the hardware may have been temporarily detached. */
453static void hardware_init(struct net_device *dev)
454{
455 struct net_local *lp = netdev_priv(dev);
456 long ioaddr = dev->base_addr;
457 int i;
458
459 /* Turn off the printer multiplexer on the 8012. */
460 for (i = 0; i < 8; i++)
461 outb(mux_8012[i], ioaddr + PAR_DATA);
462 write_reg_high(ioaddr, CMR1, CMR1h_RESET);
463
464 for (i = 0; i < 6; i++)
465 write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);
466
467 write_reg_high(ioaddr, CMR2, lp->addr_mode);
468
469 if (net_debug > 2) {
470 printk(KERN_DEBUG "%s: Reset: current Rx mode %d.\n", dev->name,
471 (read_nibble(ioaddr, CMR2_h) >> 3) & 0x0f);
472 }
473
474 write_reg(ioaddr, CMR2, CMR2_IRQOUT);
475 write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE);
476
477 /* Enable the interrupt line from the serial port. */
478 outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
479
480 /* Unmask the interesting interrupts. */
481 write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK);
482 write_reg_high(ioaddr, IMR, ISRh_RxErr);
483
484 lp->tx_unit_busy = 0;
485 lp->pac_cnt_in_tx_buf = 0;
486 lp->saved_tx_size = 0;
487}
488
489static void trigger_send(long ioaddr, int length)
490{
491 write_reg_byte(ioaddr, TxCNT0, length & 0xff);
492 write_reg(ioaddr, TxCNT1, length >> 8);
493 write_reg(ioaddr, CMR1, CMR1_Xmit);
494}
495
496static void write_packet(long ioaddr, int length, unsigned char *packet, int pad_len, int data_mode)
497{
498 if (length & 1)
499 {
500 length++;
501 pad_len++;
502 }
503
504 outb(EOC+MAR, ioaddr + PAR_DATA);
505 if ((data_mode & 1) == 0) {
506 /* Write the packet out, starting with the write addr. */
507 outb(WrAddr+MAR, ioaddr + PAR_DATA);
508 do {
509 write_byte_mode0(ioaddr, *packet++);
510 } while (--length > pad_len) ;
511 do {
512 write_byte_mode0(ioaddr, 0);
513 } while (--length > 0) ;
514 } else {
515 /* Write the packet out in slow mode. */
516 unsigned char outbyte = *packet++;
517
518 outb(Ctrl_LNibWrite + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
519 outb(WrAddr+MAR, ioaddr + PAR_DATA);
520
521 outb((outbyte & 0x0f)|0x40, ioaddr + PAR_DATA);
522 outb(outbyte & 0x0f, ioaddr + PAR_DATA);
523 outbyte >>= 4;
524 outb(outbyte & 0x0f, ioaddr + PAR_DATA);
525 outb(Ctrl_HNibWrite + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
526 while (--length > pad_len)
527 write_byte_mode1(ioaddr, *packet++);
528 while (--length > 0)
529 write_byte_mode1(ioaddr, 0);
530 }
531 /* Terminate the Tx frame. End of write: ECB. */
532 outb(0xff, ioaddr + PAR_DATA);
533 outb(Ctrl_HNibWrite | Ctrl_SelData | Ctrl_IRQEN, ioaddr + PAR_CONTROL);
534}
535
536static void tx_timeout(struct net_device *dev)
537{
538 long ioaddr = dev->base_addr;
539
540 printk(KERN_WARNING "%s: Transmit timed out, %s?\n", dev->name,
541 inb(ioaddr + PAR_CONTROL) & 0x10 ? "network cable problem"
542 : "IRQ conflict");
543 dev->stats.tx_errors++;
544 /* Try to restart the adapter. */
545 hardware_init(dev);
546 netif_trans_update(dev); /* prevent tx timeout */
547 netif_wake_queue(dev);
548 dev->stats.tx_errors++;
549}
550
551static netdev_tx_t atp_send_packet(struct sk_buff *skb,
552 struct net_device *dev)
553{
554 struct net_local *lp = netdev_priv(dev);
555 long ioaddr = dev->base_addr;
556 int length;
557 unsigned long flags;
558
559 length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
560
561 netif_stop_queue(dev);
562
563 /* Disable interrupts by writing 0x00 to the Interrupt Mask Register.
564 This sequence must not be interrupted by an incoming packet. */
565
566 spin_lock_irqsave(&lp->lock, flags);
567 write_reg(ioaddr, IMR, 0);
568 write_reg_high(ioaddr, IMR, 0);
569 spin_unlock_irqrestore(&lp->lock, flags);
570
571 write_packet(ioaddr, length, skb->data, length-skb->len, dev->if_port);
572
573 lp->pac_cnt_in_tx_buf++;
574 if (lp->tx_unit_busy == 0) {
575 trigger_send(ioaddr, length);
576 lp->saved_tx_size = 0; /* Redundant */
577 lp->re_tx = 0;
578 lp->tx_unit_busy = 1;
579 } else
580 lp->saved_tx_size = length;
581 /* Re-enable the LPT interrupts. */
582 write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK);
583 write_reg_high(ioaddr, IMR, ISRh_RxErr);
584
585 dev_kfree_skb (skb);
586 return NETDEV_TX_OK;
587}
588
589
590/* The typical workload of the driver:
591 Handle the network interface interrupts. */
592static irqreturn_t atp_interrupt(int irq, void *dev_instance)
593{
594 struct net_device *dev = dev_instance;
595 struct net_local *lp;
596 long ioaddr;
597 static int num_tx_since_rx;
598 int boguscount = max_interrupt_work;
599 int handled = 0;
600
601 ioaddr = dev->base_addr;
602 lp = netdev_priv(dev);
603
604 spin_lock(&lp->lock);
605
606 /* Disable additional spurious interrupts. */
607 outb(Ctrl_SelData, ioaddr + PAR_CONTROL);
608
609 /* The adapter's output is currently the IRQ line, switch it to data. */
610 write_reg(ioaddr, CMR2, CMR2_NULL);
611 write_reg(ioaddr, IMR, 0);
612
613 if (net_debug > 5) printk(KERN_DEBUG "%s: In interrupt ", dev->name);
614 while (--boguscount > 0) {
615 int status = read_nibble(ioaddr, ISR);
616 if (net_debug > 5) printk("loop status %02x..", status);
617
618 if (status & (ISR_RxOK<<3)) {
619 handled = 1;
620 write_reg(ioaddr, ISR, ISR_RxOK); /* Clear the Rx interrupt. */
621 do {
622 int read_status = read_nibble(ioaddr, CMR1);
623 if (net_debug > 6)
624 printk("handling Rx packet %02x..", read_status);
625 /* We acknowledged the normal Rx interrupt, so if the interrupt
626 is still outstanding we must have a Rx error. */
627 if (read_status & (CMR1_IRQ << 3)) { /* Overrun. */
628 dev->stats.rx_over_errors++;
629 /* Set to no-accept mode long enough to remove a packet. */
630 write_reg_high(ioaddr, CMR2, CMR2h_OFF);
631 net_rx(dev);
632 /* Clear the interrupt and return to normal Rx mode. */
633 write_reg_high(ioaddr, ISR, ISRh_RxErr);
634 write_reg_high(ioaddr, CMR2, lp->addr_mode);
635 } else if ((read_status & (CMR1_BufEnb << 3)) == 0) {
636 net_rx(dev);
637 num_tx_since_rx = 0;
638 } else
639 break;
640 } while (--boguscount > 0);
641 } else if (status & ((ISR_TxErr + ISR_TxOK)<<3)) {
642 handled = 1;
643 if (net_debug > 6) printk("handling Tx done..");
644 /* Clear the Tx interrupt. We should check for too many failures
645 and reinitialize the adapter. */
646 write_reg(ioaddr, ISR, ISR_TxErr + ISR_TxOK);
647 if (status & (ISR_TxErr<<3)) {
648 dev->stats.collisions++;
649 if (++lp->re_tx > 15) {
650 dev->stats.tx_aborted_errors++;
651 hardware_init(dev);
652 break;
653 }
654 /* Attempt to retransmit. */
655 if (net_debug > 6) printk("attempting to ReTx");
656 write_reg(ioaddr, CMR1, CMR1_ReXmit + CMR1_Xmit);
657 } else {
658 /* Finish up the transmit. */
659 dev->stats.tx_packets++;
660 lp->pac_cnt_in_tx_buf--;
661 if ( lp->saved_tx_size) {
662 trigger_send(ioaddr, lp->saved_tx_size);
663 lp->saved_tx_size = 0;
664 lp->re_tx = 0;
665 } else
666 lp->tx_unit_busy = 0;
667 netif_wake_queue(dev); /* Inform upper layers. */
668 }
669 num_tx_since_rx++;
670 } else if (num_tx_since_rx > 8 &&
671 time_after(jiffies, lp->last_rx_time + HZ)) {
672 if (net_debug > 2)
673 printk(KERN_DEBUG "%s: Missed packet? No Rx after %d Tx and "
674 "%ld jiffies status %02x CMR1 %02x.\n", dev->name,
675 num_tx_since_rx, jiffies - lp->last_rx_time, status,
676 (read_nibble(ioaddr, CMR1) >> 3) & 15);
677 dev->stats.rx_missed_errors++;
678 hardware_init(dev);
679 num_tx_since_rx = 0;
680 break;
681 } else
682 break;
683 }
684
685 /* This following code fixes a rare (and very difficult to track down)
686 problem where the adapter forgets its ethernet address. */
687 {
688 int i;
689 for (i = 0; i < 6; i++)
690 write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);
691#if 0 && defined(TIMED_CHECKER)
692 mod_timer(&lp->timer, jiffies + TIMED_CHECKER);
693#endif
694 }
695
696 /* Tell the adapter that it can go back to using the output line as IRQ. */
697 write_reg(ioaddr, CMR2, CMR2_IRQOUT);
698 /* Enable the physical interrupt line, which is sure to be low until.. */
699 outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
700 /* .. we enable the interrupt sources. */
701 write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK);
702 write_reg_high(ioaddr, IMR, ISRh_RxErr); /* Hmmm, really needed? */
703
704 spin_unlock(&lp->lock);
705
706 if (net_debug > 5) printk("exiting interrupt.\n");
707 return IRQ_RETVAL(handled);
708}
709
710#ifdef TIMED_CHECKER
711/* This following code fixes a rare (and very difficult to track down)
712 problem where the adapter forgets its ethernet address. */
713static void atp_timed_checker(struct timer_list *t)
714{
715 struct net_local *lp = from_timer(lp, t, timer);
716 struct net_device *dev = lp->dev;
717 long ioaddr = dev->base_addr;
718 int tickssofar = jiffies - lp->last_rx_time;
719 int i;
720
721 spin_lock(&lp->lock);
722 if (tickssofar > 2*HZ) {
723#if 1
724 for (i = 0; i < 6; i++)
725 write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);
726 lp->last_rx_time = jiffies;
727#else
728 for (i = 0; i < 6; i++)
729 if (read_cmd_byte(ioaddr, PAR0 + i) != atp_timed_dev->dev_addr[i])
730 {
731 struct net_local *lp = netdev_priv(atp_timed_dev);
732 write_reg_byte(ioaddr, PAR0 + i, atp_timed_dev->dev_addr[i]);
733 if (i == 2)
734 dev->stats.tx_errors++;
735 else if (i == 3)
736 dev->stats.tx_dropped++;
737 else if (i == 4)
738 dev->stats.collisions++;
739 else
740 dev->stats.rx_errors++;
741 }
742#endif
743 }
744 spin_unlock(&lp->lock);
745 lp->timer.expires = jiffies + TIMED_CHECKER;
746 add_timer(&lp->timer);
747}
748#endif
749
750/* We have a good packet(s), get it/them out of the buffers. */
751static void net_rx(struct net_device *dev)
752{
753 struct net_local *lp = netdev_priv(dev);
754 long ioaddr = dev->base_addr;
755 struct rx_header rx_head;
756
757 /* Process the received packet. */
758 outb(EOC+MAR, ioaddr + PAR_DATA);
759 read_block(ioaddr, 8, (unsigned char*)&rx_head, dev->if_port);
760 if (net_debug > 5)
761 printk(KERN_DEBUG " rx_count %04x %04x %04x %04x..", rx_head.pad,
762 rx_head.rx_count, rx_head.rx_status, rx_head.cur_addr);
763 if ((rx_head.rx_status & 0x77) != 0x01) {
764 dev->stats.rx_errors++;
765 if (rx_head.rx_status & 0x0004) dev->stats.rx_frame_errors++;
766 else if (rx_head.rx_status & 0x0002) dev->stats.rx_crc_errors++;
767 if (net_debug > 3)
768 printk(KERN_DEBUG "%s: Unknown ATP Rx error %04x.\n",
769 dev->name, rx_head.rx_status);
770 if (rx_head.rx_status & 0x0020) {
771 dev->stats.rx_fifo_errors++;
772 write_reg_high(ioaddr, CMR1, CMR1h_TxENABLE);
773 write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE);
774 } else if (rx_head.rx_status & 0x0050)
775 hardware_init(dev);
776 return;
777 } else {
778 /* Malloc up new buffer. The "-4" omits the FCS (CRC). */
779 int pkt_len = (rx_head.rx_count & 0x7ff) - 4;
780 struct sk_buff *skb;
781
782 skb = netdev_alloc_skb(dev, pkt_len + 2);
783 if (skb == NULL) {
784 dev->stats.rx_dropped++;
785 goto done;
786 }
787
788 skb_reserve(skb, 2); /* Align IP on 16 byte boundaries */
789 read_block(ioaddr, pkt_len, skb_put(skb,pkt_len), dev->if_port);
790 skb->protocol = eth_type_trans(skb, dev);
791 netif_rx(skb);
792 dev->stats.rx_packets++;
793 dev->stats.rx_bytes += pkt_len;
794 }
795 done:
796 write_reg(ioaddr, CMR1, CMR1_NextPkt);
797 lp->last_rx_time = jiffies;
798}
799
800static void read_block(long ioaddr, int length, unsigned char *p, int data_mode)
801{
802 if (data_mode <= 3) { /* Mode 0 or 1 */
803 outb(Ctrl_LNibRead, ioaddr + PAR_CONTROL);
804 outb(length == 8 ? RdAddr | HNib | MAR : RdAddr | MAR,
805 ioaddr + PAR_DATA);
806 if (data_mode <= 1) { /* Mode 0 or 1 */
807 do { *p++ = read_byte_mode0(ioaddr); } while (--length > 0);
808 } else { /* Mode 2 or 3 */
809 do { *p++ = read_byte_mode2(ioaddr); } while (--length > 0);
810 }
811 } else if (data_mode <= 5) {
812 do { *p++ = read_byte_mode4(ioaddr); } while (--length > 0);
813 } else {
814 do { *p++ = read_byte_mode6(ioaddr); } while (--length > 0);
815 }
816
817 outb(EOC+HNib+MAR, ioaddr + PAR_DATA);
818 outb(Ctrl_SelData, ioaddr + PAR_CONTROL);
819}
820
821/* The inverse routine to net_open(). */
822static int
823net_close(struct net_device *dev)
824{
825 struct net_local *lp = netdev_priv(dev);
826 long ioaddr = dev->base_addr;
827
828 netif_stop_queue(dev);
829
830 del_timer_sync(&lp->timer);
831
832 /* Flush the Tx and disable Rx here. */
833 lp->addr_mode = CMR2h_OFF;
834 write_reg_high(ioaddr, CMR2, CMR2h_OFF);
835
836 /* Free the IRQ line. */
837 outb(0x00, ioaddr + PAR_CONTROL);
838 free_irq(dev->irq, dev);
839
840 /* Reset the ethernet hardware and activate the printer pass-through. */
841 write_reg_high(ioaddr, CMR1, CMR1h_RESET | CMR1h_MUX);
842 return 0;
843}
844
845/*
846 * Set or clear the multicast filter for this adapter.
847 */
848
849static void set_rx_mode(struct net_device *dev)
850{
851 struct net_local *lp = netdev_priv(dev);
852 long ioaddr = dev->base_addr;
853
854 if (!netdev_mc_empty(dev) || (dev->flags & (IFF_ALLMULTI|IFF_PROMISC)))
855 lp->addr_mode = CMR2h_PROMISC;
856 else
857 lp->addr_mode = CMR2h_Normal;
858 write_reg_high(ioaddr, CMR2, lp->addr_mode);
859}
860
861static int __init atp_init_module(void) {
862 if (debug) /* Emit version even if no cards detected. */
863 printk(KERN_INFO "%s", version);
864 return atp_init();
865}
866
867static void __exit atp_cleanup_module(void) {
868 struct net_device *next_dev;
869
870 while (root_atp_dev) {
871 struct net_local *atp_local = netdev_priv(root_atp_dev);
872 next_dev = atp_local->next_module;
873 unregister_netdev(root_atp_dev);
874 /* No need to release_region(), since we never snarf it. */
875 free_netdev(root_atp_dev);
876 root_atp_dev = next_dev;
877 }
878}
879
880module_init(atp_init_module);
881module_exit(atp_cleanup_module);