projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge remote-tracking branch 'net-next/master' into mac80211-next
[linux-2.6-block.git] / drivers / net / ethernet / realtek / atp.c
CommitLineData
1da177e4
LT		 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
2c2a8c53 34static const char version[] =
1da177e4 35"atp.c:v1.09=ac 2002/10/01 Donald Becker <becker@scyld.com>\n";
1da177e4
LT		 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.
631dd1a8 71 http://www.realtek.com.tw/
1da177e4
LT		 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>
1da177e4
LT		 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
1da177e4
LT		 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);
df298408
DH		 154module_param_hw_array(io, int, ioport, NULL, 0);
155module_param_hw_array(irq, int, irq, NULL, 0);
1da177e4
LT		 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;
1da177e4 172 struct timer_list timer; /* Media selection timer. */
9de36ccf 173 struct net_device *dev; /* Timer dev. */
4a7c9726 174 unsigned long last_rx_time; /* Last Rx, in jiffies, to handle Rx hang. */
1da177e4
LT		 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. */
bb263e18 179 pac_cnt_in_tx_buf;
1da177e4
LT		 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>
9de36ccf 188static void atp_timed_checker(struct timer_list *t);
1da177e4
LT		 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);
61357325
SH		 200static netdev_tx_t atp_send_packet(struct sk_buff *skb,
201 struct net_device *dev);
7d12e780 202static irqreturn_t atp_interrupt(int irq, void *dev_id);
1da177e4
LT		 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);
3a1a27fa 206static void set_rx_mode(struct net_device *dev);
1da177e4
LT		 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).
6aa20a22 218
1da177e4
LT		 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
3a1a27fa
SH		 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,
afc4b13d 247 .ndo_set_rx_mode = set_rx_mode,
3a1a27fa 248 .ndo_tx_timeout = tx_timeout,
3a1a27fa
SH		 249 .ndo_set_mac_address = eth_mac_addr,
250 .ndo_validate_addr = eth_validate_addr,
251};
252
1da177e4
LT		 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;
1da177e4
LT		 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)
2c2a8c53 330 printk(KERN_INFO "%s", version);
1da177e4
LT		 331#endif
332
0795af57 333 printk(KERN_NOTICE "%s: Pocket adapter found at %#3lx, IRQ %d, "
e174961c
JB		 334 "SAPROM %pM.\n",
335 dev->name, dev->base_addr, dev->irq, dev->dev_addr);
1da177e4
LT		 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);
1da177e4
LT		 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
3a1a27fa 352 dev->netdev_ops = &atp_netdev_ops;
1da177e4
LT		 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++)
eca1ad82
AV		 382 ((__be16 *)dev->dev_addr)[i] =
383 cpu_to_be16(eeprom_op(ioaddr, EE_READ(sa_offset + i)));
1da177e4
LT		 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
b74ca3a8 425 This is an attachable device: if there is no private entry then it wasn't
1da177e4
LT		 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. */
a0607fd3 436 ret = request_irq(dev->irq, atp_interrupt, 0, dev->name, dev);
1da177e4
LT		 437 if (ret)
438 return ret;
439
440 hardware_init(dev);
441
9de36ccf
KC		 442 lp->dev = dev;
443 timer_setup(&lp->timer, atp_timed_checker, 0);
1da177e4 444 lp->timer.expires = jiffies + TIMED_CHECKER;
1da177e4
LT		 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;
eedfb223 457 int i;
1da177e4
LT		 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
eedfb223 464 for (i = 0; i < 6; i++)
1da177e4
LT		 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
eedfb223
CIK		 474 write_reg(ioaddr, CMR2, CMR2_IRQOUT);
475 write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE);
1da177e4
LT		 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. */
eedfb223
CIK		 481 write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK);
482 write_reg_high(ioaddr, IMR, ISRh_RxErr);
1da177e4
LT		 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{
1da177e4
LT		 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");
09f75cd7 543 dev->stats.tx_errors++;
1da177e4
LT		 544 /* Try to restart the adapter. */
545 hardware_init(dev);
860e9538 546 netif_trans_update(dev); /* prevent tx timeout */
1da177e4 547 netif_wake_queue(dev);
09f75cd7 548 dev->stats.tx_errors++;
1da177e4
LT		 549}
550
61357325
SH		 551static netdev_tx_t atp_send_packet(struct sk_buff *skb,
552 struct net_device *dev)
1da177e4
LT		 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
1da177e4 585 dev_kfree_skb (skb);
6ed10654 586 return NETDEV_TX_OK;
1da177e4
LT		 587}
588
589
590/* The typical workload of the driver:
591 Handle the network interface interrupts. */
7d12e780 592static irqreturn_t atp_interrupt(int irq, void *dev_instance)
1da177e4 593{
c31f28e7 594 struct net_device *dev = dev_instance;
1da177e4
LT		 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
1da177e4
LT		 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
eedfb223
CIK		 613 if (net_debug > 5)
614 printk(KERN_DEBUG "%s: In interrupt ", dev->name);
615 while (--boguscount > 0) {
1da177e4 616 int status = read_nibble(ioaddr, ISR);
eedfb223
CIK		 617 if (net_debug > 5)
618 printk("loop status %02x..", status);
1da177e4
LT		 619
620 if (status & (ISR_RxOK<<3)) {
621 handled = 1;
622 write_reg(ioaddr, ISR, ISR_RxOK); /* Clear the Rx interrupt. */
623 do {
624 int read_status = read_nibble(ioaddr, CMR1);
625 if (net_debug > 6)
626 printk("handling Rx packet %02x..", read_status);
627 /* We acknowledged the normal Rx interrupt, so if the interrupt
628 is still outstanding we must have a Rx error. */
629 if (read_status & (CMR1_IRQ << 3)) { /* Overrun. */
09f75cd7 630 dev->stats.rx_over_errors++;
1da177e4
LT		 631 /* Set to no-accept mode long enough to remove a packet. */
632 write_reg_high(ioaddr, CMR2, CMR2h_OFF);
633 net_rx(dev);
634 /* Clear the interrupt and return to normal Rx mode. */
635 write_reg_high(ioaddr, ISR, ISRh_RxErr);
636 write_reg_high(ioaddr, CMR2, lp->addr_mode);
637 } else if ((read_status & (CMR1_BufEnb << 3)) == 0) {
638 net_rx(dev);
639 num_tx_since_rx = 0;
640 } else
641 break;
642 } while (--boguscount > 0);
643 } else if (status & ((ISR_TxErr + ISR_TxOK)<<3)) {
644 handled = 1;
eedfb223
CIK		 645 if (net_debug > 6)
646 printk("handling Tx done..");
1da177e4
LT		 647 /* Clear the Tx interrupt. We should check for too many failures
648 and reinitialize the adapter. */
649 write_reg(ioaddr, ISR, ISR_TxErr + ISR_TxOK);
650 if (status & (ISR_TxErr<<3)) {
09f75cd7 651 dev->stats.collisions++;
1da177e4 652 if (++lp->re_tx > 15) {
09f75cd7 653 dev->stats.tx_aborted_errors++;
1da177e4
LT		 654 hardware_init(dev);
655 break;
656 }
657 /* Attempt to retransmit. */
658 if (net_debug > 6) printk("attempting to ReTx");
659 write_reg(ioaddr, CMR1, CMR1_ReXmit + CMR1_Xmit);
660 } else {
661 /* Finish up the transmit. */
09f75cd7 662 dev->stats.tx_packets++;
1da177e4
LT		 663 lp->pac_cnt_in_tx_buf--;
664 if ( lp->saved_tx_size) {
665 trigger_send(ioaddr, lp->saved_tx_size);
666 lp->saved_tx_size = 0;
667 lp->re_tx = 0;
668 } else
669 lp->tx_unit_busy = 0;
670 netif_wake_queue(dev); /* Inform upper layers. */
671 }
672 num_tx_since_rx++;
8e95a202 673 } else if (num_tx_since_rx > 8 &&
4a7c9726 674 time_after(jiffies, lp->last_rx_time + HZ)) {
1da177e4
LT		 675 if (net_debug > 2)
676 printk(KERN_DEBUG "%s: Missed packet? No Rx after %d Tx and "
677 "%ld jiffies status %02x CMR1 %02x.\n", dev->name,
4a7c9726 678 num_tx_since_rx, jiffies - lp->last_rx_time, status,
1da177e4 679 (read_nibble(ioaddr, CMR1) >> 3) & 15);
09f75cd7 680 dev->stats.rx_missed_errors++;
1da177e4
LT		 681 hardware_init(dev);
682 num_tx_since_rx = 0;
683 break;
684 } else
685 break;
eedfb223 686 }
1da177e4
LT		 687
688 /* This following code fixes a rare (and very difficult to track down)
689 problem where the adapter forgets its ethernet address. */
690 {
691 int i;
692 for (i = 0; i < 6; i++)
693 write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);
694#if 0 && defined(TIMED_CHECKER)
695 mod_timer(&lp->timer, jiffies + TIMED_CHECKER);
696#endif
697 }
698
699 /* Tell the adapter that it can go back to using the output line as IRQ. */
eedfb223 700 write_reg(ioaddr, CMR2, CMR2_IRQOUT);
1da177e4
LT		 701 /* Enable the physical interrupt line, which is sure to be low until.. */
702 outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
703 /* .. we enable the interrupt sources. */
704 write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK);
705 write_reg_high(ioaddr, IMR, ISRh_RxErr); /* Hmmm, really needed? */
706
707 spin_unlock(&lp->lock);
708
709 if (net_debug > 5) printk("exiting interrupt.\n");
710 return IRQ_RETVAL(handled);
711}
712
713#ifdef TIMED_CHECKER
714/* This following code fixes a rare (and very difficult to track down)
715 problem where the adapter forgets its ethernet address. */
9de36ccf 716static void atp_timed_checker(struct timer_list *t)
1da177e4 717{
9de36ccf
KC		 718 struct net_local *lp = from_timer(lp, t, timer);
719 struct net_device *dev = lp->dev;
1da177e4 720 long ioaddr = dev->base_addr;
1da177e4
LT		 721 int tickssofar = jiffies - lp->last_rx_time;
722 int i;
723
724 spin_lock(&lp->lock);
725 if (tickssofar > 2*HZ) {
726#if 1
727 for (i = 0; i < 6; i++)
728 write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);
729 lp->last_rx_time = jiffies;
730#else
731 for (i = 0; i < 6; i++)
732 if (read_cmd_byte(ioaddr, PAR0 + i) != atp_timed_dev->dev_addr[i])
733 {
734 struct net_local *lp = netdev_priv(atp_timed_dev);
735 write_reg_byte(ioaddr, PAR0 + i, atp_timed_dev->dev_addr[i]);
736 if (i == 2)
09f75cd7 737 dev->stats.tx_errors++;
1da177e4 738 else if (i == 3)
09f75cd7 739 dev->stats.tx_dropped++;
1da177e4 740 else if (i == 4)
09f75cd7 741 dev->stats.collisions++;
1da177e4 742 else
09f75cd7 743 dev->stats.rx_errors++;
1da177e4
LT		 744 }
745#endif
746 }
747 spin_unlock(&lp->lock);
748 lp->timer.expires = jiffies + TIMED_CHECKER;
749 add_timer(&lp->timer);
750}
751#endif
752
753/* We have a good packet(s), get it/them out of the buffers. */
754static void net_rx(struct net_device *dev)
755{
756 struct net_local *lp = netdev_priv(dev);
757 long ioaddr = dev->base_addr;
758 struct rx_header rx_head;
759
760 /* Process the received packet. */
761 outb(EOC+MAR, ioaddr + PAR_DATA);
762 read_block(ioaddr, 8, (unsigned char*)&rx_head, dev->if_port);
763 if (net_debug > 5)
764 printk(KERN_DEBUG " rx_count %04x %04x %04x %04x..", rx_head.pad,
765 rx_head.rx_count, rx_head.rx_status, rx_head.cur_addr);
766 if ((rx_head.rx_status & 0x77) != 0x01) {
09f75cd7
JG		 767 dev->stats.rx_errors++;
768 if (rx_head.rx_status & 0x0004) dev->stats.rx_frame_errors++;
769 else if (rx_head.rx_status & 0x0002) dev->stats.rx_crc_errors++;
1da177e4
LT		 770 if (net_debug > 3)
771 printk(KERN_DEBUG "%s: Unknown ATP Rx error %04x.\n",
772 dev->name, rx_head.rx_status);
773 if (rx_head.rx_status & 0x0020) {
09f75cd7 774 dev->stats.rx_fifo_errors++;
1da177e4
LT		 775 write_reg_high(ioaddr, CMR1, CMR1h_TxENABLE);
776 write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE);
777 } else if (rx_head.rx_status & 0x0050)
778 hardware_init(dev);
779 return;
780 } else {
781 /* Malloc up new buffer. The "-4" omits the FCS (CRC). */
782 int pkt_len = (rx_head.rx_count & 0x7ff) - 4;
783 struct sk_buff *skb;
784
dae2e9f4 785 skb = netdev_alloc_skb(dev, pkt_len + 2);
1da177e4 786 if (skb == NULL) {
09f75cd7 787 dev->stats.rx_dropped++;
1da177e4
LT		 788 goto done;
789 }
1da177e4
LT		 790
791 skb_reserve(skb, 2); /* Align IP on 16 byte boundaries */
792 read_block(ioaddr, pkt_len, skb_put(skb,pkt_len), dev->if_port);
793 skb->protocol = eth_type_trans(skb, dev);
794 netif_rx(skb);
09f75cd7
JG		 795 dev->stats.rx_packets++;
796 dev->stats.rx_bytes += pkt_len;
1da177e4
LT		 797 }
798 done:
799 write_reg(ioaddr, CMR1, CMR1_NextPkt);
800 lp->last_rx_time = jiffies;
1da177e4
LT		 801}
802
803static void read_block(long ioaddr, int length, unsigned char *p, int data_mode)
804{
1da177e4
LT		 805 if (data_mode <= 3) { /* Mode 0 or 1 */
806 outb(Ctrl_LNibRead, ioaddr + PAR_CONTROL);
807 outb(length == 8 ? RdAddr | HNib | MAR : RdAddr | MAR,
808 ioaddr + PAR_DATA);
809 if (data_mode <= 1) { /* Mode 0 or 1 */
e4c3c13c
HE		 810 do { *p++ = read_byte_mode0(ioaddr); } while (--length > 0);
811 } else { /* Mode 2 or 3 */
812 do { *p++ = read_byte_mode2(ioaddr); } while (--length > 0);
813 }
814 } else if (data_mode <= 5) {
815 do { *p++ = read_byte_mode4(ioaddr); } while (--length > 0);
816 } else {
817 do { *p++ = read_byte_mode6(ioaddr); } while (--length > 0);
818 }
1da177e4 819
e4c3c13c 820 outb(EOC+HNib+MAR, ioaddr + PAR_DATA);
1da177e4
LT		 821 outb(Ctrl_SelData, ioaddr + PAR_CONTROL);
822}
823
824/* The inverse routine to net_open(). */
825static int
826net_close(struct net_device *dev)
827{
828 struct net_local *lp = netdev_priv(dev);
829 long ioaddr = dev->base_addr;
830
831 netif_stop_queue(dev);
832
833 del_timer_sync(&lp->timer);
834
835 /* Flush the Tx and disable Rx here. */
836 lp->addr_mode = CMR2h_OFF;
837 write_reg_high(ioaddr, CMR2, CMR2h_OFF);
838
839 /* Free the IRQ line. */
840 outb(0x00, ioaddr + PAR_CONTROL);
841 free_irq(dev->irq, dev);
842
843 /* Reset the ethernet hardware and activate the printer pass-through. */
844 write_reg_high(ioaddr, CMR1, CMR1h_RESET | CMR1h_MUX);
845 return 0;
846}
847
1da177e4
LT		 848/*
849 * Set or clear the multicast filter for this adapter.
850 */
851
bb263e18 852static void set_rx_mode(struct net_device *dev)
1da177e4
LT		 853{
854 struct net_local *lp = netdev_priv(dev);
855 long ioaddr = dev->base_addr;
856
4cd24eaf 857 if (!netdev_mc_empty(dev) || (dev->flags & (IFF_ALLMULTI|IFF_PROMISC)))
1da177e4 858 lp->addr_mode = CMR2h_PROMISC;
c16d1185 859 else
1da177e4
LT		 860 lp->addr_mode = CMR2h_Normal;
861 write_reg_high(ioaddr, CMR2, lp->addr_mode);
862}
863
1da177e4
LT		 864static int __init atp_init_module(void) {
865 if (debug) /* Emit version even if no cards detected. */
2c2a8c53 866 printk(KERN_INFO "%s", version);
1da177e4
LT		 867 return atp_init();
868}
869
870static void __exit atp_cleanup_module(void) {
871 struct net_device *next_dev;
872
873 while (root_atp_dev) {
454d7c9b
WC		 874 struct net_local *atp_local = netdev_priv(root_atp_dev);
875 next_dev = atp_local->next_module;
1da177e4
LT		 876 unregister_netdev(root_atp_dev);
877 /* No need to release_region(), since we never snarf it. */
878 free_netdev(root_atp_dev);
879 root_atp_dev = next_dev;
880 }
881}
882
883module_init(atp_init_module);
884module_exit(atp_cleanup_module);
Linux 6.x block layer and io_uring tree(s)