1 /* atp.c: Attached (pocket) ethernet adapter driver for linux. */
3 This is a driver for commonly OEM pocket (parallel port)
4 ethernet adapters based on the Realtek RTL8002 and RTL8012 chips.
6 Written 1993-2000 by Donald Becker.
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.
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.
20 The author may be reached as becker@scyld.com, or C/O
21 Scyld Computing Corporation
22 410 Severn Ave., Suite 210
25 Support information and updates available at
26 http://www.scyld.com/network/atp.html
29 Modular support/softnet added by Alan Cox.
33 static const char versionA[] =
34 "atp.c:v1.09 8/9/2000 Donald Becker <becker@scyld.com>\n";
35 static const char versionB[] =
36 " http://www.scyld.com/network/atp.html\n";
38 /* The user-configurable values.
39 These may be modified when a driver module is loaded.*/
41 static int debug = 1; /* 1 normal messages, 0 quiet .. 7 verbose. */
42 #define net_debug debug
44 /* Maximum events (Rx packets, etc.) to handle at each interrupt. */
45 static int max_interrupt_work = 15;
48 /* The standard set of ISA module parameters. */
49 static int io[NUM_UNITS];
50 static int irq[NUM_UNITS];
51 static int xcvr[NUM_UNITS]; /* The data transfer mode. */
53 /* Operational parameters that are set at compile time. */
55 /* Time in jiffies before concluding the transmitter is hung. */
56 #define TX_TIMEOUT (400*HZ/1000)
59 This file is a device driver for the RealTek (aka AT-Lan-Tec) pocket
60 ethernet adapter. This is a common low-cost OEM pocket ethernet
61 adapter, sold under many names.
64 This driver was written from the packet driver assembly code provided by
65 Vincent Bono of AT-Lan-Tec. Ever try to figure out how a complicated
66 device works just from the assembly code? It ain't pretty. The following
67 description is written based on guesses and writing lots of special-purpose
68 code to test my theorized operation.
70 In 1997 Realtek made available the documentation for the second generation
71 RTL8012 chip, which has lead to several driver improvements.
72 http://www.realtek.com.tw/cn/cn.html
76 The RTL8002 adapter seems to be built around a custom spin of the SEEQ
77 controller core. It probably has a 16K or 64K internal packet buffer, of
78 which the first 4K is devoted to transmit and the rest to receive.
79 The controller maintains the queue of received packet and the packet buffer
80 access pointer internally, with only 'reset to beginning' and 'skip to next
81 packet' commands visible. The transmit packet queue holds two (or more?)
82 packets: both 'retransmit this packet' (due to collision) and 'transmit next
83 packet' commands must be started by hand.
85 The station address is stored in a standard bit-serial EEPROM which must be
86 read (ughh) by the device driver. (Provisions have been made for
87 substituting a 74S288 PROM, but I haven't gotten reports of any models
88 using it.) Unlike built-in devices, a pocket adapter can temporarily lose
89 power without indication to the device driver. The major effect is that
90 the station address, receive filter (promiscuous, etc.) and transceiver
93 The controller itself has 16 registers, some of which use only the lower
94 bits. The registers are read and written 4 bits at a time. The four bit
95 register address is presented on the data lines along with a few additional
96 timing and control bits. The data is then read from status port or written
99 Correction: the controller has two banks of 16 registers. The second
100 bank contains only the multicast filter table (now used) and the EEPROM
103 Since the bulk data transfer of the actual packets through the slow
104 parallel port dominates the driver's running time, four distinct data
105 (non-register) transfer modes are provided by the adapter, two in each
106 direction. In the first mode timing for the nibble transfers is
107 provided through the data port. In the second mode the same timing is
108 provided through the control port. In either case the data is read from
109 the status port and written to the data port, just as it is accessing
112 In addition to the basic data transfer methods, several more are modes are
113 created by adding some delay by doing multiple reads of the data to allow
114 it to stabilize. This delay seems to be needed on most machines.
116 The data transfer mode is stored in the 'dev->if_port' field. Its default
117 value is '4'. It may be overridden at boot-time using the third parameter
118 to the "ether=..." initialization.
120 The header file <atp.h> provides inline functions that encapsulate the
121 register and data access methods. These functions are hand-tuned to
122 generate reasonable object code. This header file also documents my
123 interpretations of the device registers.
126 #include <linux/kernel.h>
127 #include <linux/module.h>
128 #include <linux/sched.h>
129 #include <linux/types.h>
130 #include <linux/fcntl.h>
131 #include <linux/interrupt.h>
132 #include <linux/ptrace.h>
133 #include <linux/ioport.h>
134 #include <linux/in.h>
135 #include <linux/slab.h>
136 #include <linux/string.h>
137 #include <asm/system.h>
138 #include <asm/bitops.h>
141 #include <linux/errno.h>
142 #include <linux/init.h>
143 #include <linux/crc32.h>
145 #include <linux/netdevice.h>
146 #include <linux/etherdevice.h>
147 #include <linux/skbuff.h>
148 #include <linux/spinlock.h>
149 #include <linux/delay.h>
153 MODULE_AUTHOR("Donald Becker <becker@scyld.com>");
154 MODULE_DESCRIPTION("RealTek RTL8002/8012 parallel port Ethernet driver");
155 MODULE_LICENSE("GPL");
157 MODULE_PARM(max_interrupt_work, "i");
158 MODULE_PARM(debug, "i");
159 MODULE_PARM(io, "1-" __MODULE_STRING(NUM_UNITS) "i");
160 MODULE_PARM(irq, "1-" __MODULE_STRING(NUM_UNITS) "i");
161 MODULE_PARM(xcvr, "1-" __MODULE_STRING(NUM_UNITS) "i");
162 MODULE_PARM_DESC(max_interrupt_work, "ATP maximum events handled per interrupt");
163 MODULE_PARM_DESC(debug, "ATP debug level (0-7)");
164 MODULE_PARM_DESC(io, "ATP I/O base address(es)");
165 MODULE_PARM_DESC(irq, "ATP IRQ number(s)");
166 MODULE_PARM_DESC(xcvr, "ATP tranceiver(s) (0=internal, 1=external)");
168 #define RUN_AT(x) (jiffies + (x))
170 /* The number of low I/O ports used by the ethercard. */
171 #define ETHERCARD_TOTAL_SIZE 3
173 /* Sequence to switch an 8012 from printer mux to ethernet mode. */
174 static char mux_8012[] = { 0xff, 0xf7, 0xff, 0xfb, 0xf3, 0xfb, 0xff, 0xf7,};
178 struct net_device *next_module;
179 struct net_device_stats stats;
180 struct timer_list timer; /* Media selection timer. */
181 long last_rx_time; /* Last Rx, in jiffies, to handle Rx hang. */
183 unsigned int tx_unit_busy:1;
184 unsigned char re_tx, /* Number of packet retransmissions. */
185 addr_mode, /* Current Rx filter e.g. promiscuous, etc. */
190 /* This code, written by wwc@super.org, resets the adapter every
191 TIMED_CHECKER ticks. This recovers from an unknown error which
193 #define TIMED_CHECKER (HZ/4)
195 #include <linux/timer.h>
196 static void atp_timed_checker(unsigned long ignored);
199 /* Index to functions, as function prototypes. */
201 static int atp_probe1(struct net_device *dev, long ioaddr);
202 static void get_node_ID(struct net_device *dev);
203 static unsigned short eeprom_op(long ioaddr, unsigned int cmd);
204 static int net_open(struct net_device *dev);
205 static void hardware_init(struct net_device *dev);
206 static void write_packet(long ioaddr, int length, unsigned char *packet, int pad, int mode);
207 static void trigger_send(long ioaddr, int length);
208 static int atp_send_packet(struct sk_buff *skb, struct net_device *dev);
209 static void atp_interrupt(int irq, void *dev_id, struct pt_regs *regs);
210 static void net_rx(struct net_device *dev);
211 static void read_block(long ioaddr, int length, unsigned char *buffer, int data_mode);
212 static int net_close(struct net_device *dev);
213 static struct net_device_stats *net_get_stats(struct net_device *dev);
214 static void set_rx_mode_8002(struct net_device *dev);
215 static void set_rx_mode_8012(struct net_device *dev);
216 static void tx_timeout(struct net_device *dev);
219 /* A list of all installed ATP devices, for removing the driver module. */
220 static struct net_device *root_atp_dev;
222 /* Check for a network adapter of this type, and return '0' iff one exists.
223 If dev->base_addr == 0, probe all likely locations.
224 If dev->base_addr == 1, always return failure.
225 If dev->base_addr == 2, allocate space for the device and return success
226 (detachable devices only).
228 static int __init atp_init(struct net_device *dev)
230 int *port, ports[] = {0x378, 0x278, 0x3bc, 0};
231 int base_addr = dev ? dev->base_addr : io[0];
233 if (base_addr > 0x1ff) /* Check a single specified location. */
234 return atp_probe1(dev, base_addr);
235 else if (base_addr == 1) /* Don't probe at all. */
238 for (port = ports; *port; port++) {
240 outb(0x57, ioaddr + PAR_DATA);
241 if (inb(ioaddr + PAR_DATA) != 0x57)
243 if (atp_probe1(dev, ioaddr) == 0)
250 static int __init atp_probe1(struct net_device *dev, long ioaddr)
252 struct net_local *lp;
253 int saved_ctrl_reg, status, i;
255 outb(0xff, ioaddr + PAR_DATA);
256 /* Save the original value of the Control register, in case we guessed
258 saved_ctrl_reg = inb(ioaddr + PAR_CONTROL);
260 printk("atp: Control register was %#2.2x.\n", saved_ctrl_reg);
261 /* IRQEN=0, SLCTB=high INITB=high, AUTOFDB=high, STBB=high. */
262 outb(0x04, ioaddr + PAR_CONTROL);
263 #ifndef final_version
265 /* Turn off the printer multiplexer on the 8012. */
266 for (i = 0; i < 8; i++)
267 outb(mux_8012[i], ioaddr + PAR_DATA);
268 write_reg(ioaddr, MODSEL, 0x00);
269 printk("atp: Registers are ");
270 for (i = 0; i < 32; i++)
271 printk(" %2.2x", read_nibble(ioaddr, i));
275 /* Turn off the printer multiplexer on the 8012. */
276 for (i = 0; i < 8; i++)
277 outb(mux_8012[i], ioaddr + PAR_DATA);
278 write_reg_high(ioaddr, CMR1, CMR1h_RESET);
280 status = read_nibble(ioaddr, CMR1);
283 printk(KERN_DEBUG "atp: Status nibble was %#2.2x..", status);
284 for (i = 0; i < 32; i++)
285 printk(" %2.2x", read_nibble(ioaddr, i));
289 if ((status & 0x78) != 0x08) {
290 /* The pocket adapter probe failed, restore the control register. */
291 outb(saved_ctrl_reg, ioaddr + PAR_CONTROL);
294 status = read_nibble(ioaddr, CMR2_h);
295 if ((status & 0x78) != 0x10) {
296 outb(saved_ctrl_reg, ioaddr + PAR_CONTROL);
300 dev = init_etherdev(dev, sizeof(struct net_local));
303 SET_MODULE_OWNER(dev);
305 /* Find the IRQ used by triggering an interrupt. */
306 write_reg_byte(ioaddr, CMR2, 0x01); /* No accept mode, IRQ out. */
307 write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); /* Enable Tx and Rx. */
309 /* Omit autoIRQ routine for now. Use "table lookup" instead. Uhgggh. */
312 else if (ioaddr == 0x378)
316 write_reg_high(ioaddr, CMR1, CMR1h_TxRxOFF); /* Disable Tx and Rx units. */
317 write_reg(ioaddr, CMR2, CMR2_NULL);
319 dev->base_addr = ioaddr;
321 /* Read the station address PROM. */
326 printk(KERN_INFO "%s" KERN_INFO "%s", versionA, versionB);
329 printk(KERN_NOTICE "%s: Pocket adapter found at %#3lx, IRQ %d, SAPROM "
330 "%02X:%02X:%02X:%02X:%02X:%02X.\n", dev->name, dev->base_addr,
331 dev->irq, dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
332 dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
334 /* Reset the ethernet hardware and activate the printer pass-through. */
335 write_reg_high(ioaddr, CMR1, CMR1h_RESET | CMR1h_MUX);
337 /* Initialize the device structure. */
339 if (dev->priv == NULL)
340 dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL);
341 if (dev->priv == NULL)
343 memset(dev->priv, 0, sizeof(struct net_local));
345 lp = (struct net_local *)dev->priv;
346 lp->chip_type = RTL8002;
347 lp->addr_mode = CMR2h_Normal;
348 spin_lock_init(&lp->lock);
350 lp->next_module = root_atp_dev;
353 /* For the ATP adapter the "if_port" is really the data transfer mode. */
355 dev->if_port = xcvr[0];
357 dev->if_port = (dev->mem_start & 0xf) ? (dev->mem_start & 0x7) : 4;
358 if (dev->mem_end & 0xf)
359 net_debug = dev->mem_end & 7;
361 dev->open = net_open;
362 dev->stop = net_close;
363 dev->hard_start_xmit = atp_send_packet;
364 dev->get_stats = net_get_stats;
365 dev->set_multicast_list =
366 lp->chip_type == RTL8002 ? &set_rx_mode_8002 : &set_rx_mode_8012;
367 dev->tx_timeout = tx_timeout;
368 dev->watchdog_timeo = TX_TIMEOUT;
373 /* Read the station address PROM, usually a word-wide EEPROM. */
374 static void __init get_node_ID(struct net_device *dev)
376 long ioaddr = dev->base_addr;
380 write_reg(ioaddr, CMR2, CMR2_EEPROM); /* Point to the EEPROM control registers. */
382 /* Some adapters have the station address at offset 15 instead of offset
383 zero. Check for it, and fix it if needed. */
384 if (eeprom_op(ioaddr, EE_READ(0)) == 0xffff)
387 for (i = 0; i < 3; i++)
388 ((u16 *)dev->dev_addr)[i] =
389 be16_to_cpu(eeprom_op(ioaddr, EE_READ(sa_offset + i)));
391 write_reg(ioaddr, CMR2, CMR2_NULL);
395 An EEPROM read command starts by shifting out 0x60+address, and then
396 shifting in the serial data. See the NatSemi databook for details.
400 * CLK: ______| |___| |
402 * DI : __X_______X_______X
403 * DO : _________X_______X
406 static unsigned short __init eeprom_op(long ioaddr, unsigned int cmd)
408 unsigned eedata_out = 0;
409 int num_bits = EE_CMD_SIZE;
411 while (--num_bits >= 0) {
412 char outval = test_bit(num_bits, &cmd) ? EE_DATA_WRITE : 0;
413 write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_LOW);
414 write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_HIGH);
416 if (read_nibble(ioaddr, PROM_DATA) & EE_DATA_READ)
419 write_reg_high(ioaddr, PROM_CMD, EE_CLK_LOW & ~EE_CS);
424 /* Open/initialize the board. This is called (in the current kernel)
425 sometime after booting when the 'ifconfig' program is run.
427 This routine sets everything up anew at each open, even
428 registers that "should" only need to be set once at boot, so that
429 there is non-reboot way to recover if something goes wrong.
431 This is an attachable device: if there is no dev->priv entry then it wasn't
432 probed for at boot-time, and we need to probe for it again.
434 static int net_open(struct net_device *dev)
436 struct net_local *lp = (struct net_local *)dev->priv;
439 /* The interrupt line is turned off (tri-stated) when the device isn't in
440 use. That's especially important for "attached" interfaces where the
441 port or interrupt may be shared. */
442 ret = request_irq(dev->irq, &atp_interrupt, 0, dev->name, dev);
448 init_timer(&lp->timer);
449 lp->timer.expires = RUN_AT(TIMED_CHECKER);
450 lp->timer.data = (unsigned long)dev;
451 lp->timer.function = &atp_timed_checker; /* timer handler */
452 add_timer(&lp->timer);
454 netif_start_queue(dev);
458 /* This routine resets the hardware. We initialize everything, assuming that
459 the hardware may have been temporarily detached. */
460 static void hardware_init(struct net_device *dev)
462 struct net_local *lp = (struct net_local *)dev->priv;
463 long ioaddr = dev->base_addr;
466 /* Turn off the printer multiplexer on the 8012. */
467 for (i = 0; i < 8; i++)
468 outb(mux_8012[i], ioaddr + PAR_DATA);
469 write_reg_high(ioaddr, CMR1, CMR1h_RESET);
471 for (i = 0; i < 6; i++)
472 write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);
474 write_reg_high(ioaddr, CMR2, lp->addr_mode);
477 printk(KERN_DEBUG "%s: Reset: current Rx mode %d.\n", dev->name,
478 (read_nibble(ioaddr, CMR2_h) >> 3) & 0x0f);
481 write_reg(ioaddr, CMR2, CMR2_IRQOUT);
482 write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE);
484 /* Enable the interrupt line from the serial port. */
485 outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
487 /* Unmask the interesting interrupts. */
488 write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK);
489 write_reg_high(ioaddr, IMR, ISRh_RxErr);
491 lp->tx_unit_busy = 0;
492 lp->pac_cnt_in_tx_buf = 0;
493 lp->saved_tx_size = 0;
496 static void trigger_send(long ioaddr, int length)
498 write_reg_byte(ioaddr, TxCNT0, length & 0xff);
499 write_reg(ioaddr, TxCNT1, length >> 8);
500 write_reg(ioaddr, CMR1, CMR1_Xmit);
503 static void write_packet(long ioaddr, int length, unsigned char *packet, int pad_len, int data_mode)
511 outb(EOC+MAR, ioaddr + PAR_DATA);
512 if ((data_mode & 1) == 0) {
513 /* Write the packet out, starting with the write addr. */
514 outb(WrAddr+MAR, ioaddr + PAR_DATA);
516 write_byte_mode0(ioaddr, *packet++);
517 } while (--length > pad_len) ;
519 write_byte_mode0(ioaddr, 0);
520 } while (--length > 0) ;
522 /* Write the packet out in slow mode. */
523 unsigned char outbyte = *packet++;
525 outb(Ctrl_LNibWrite + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
526 outb(WrAddr+MAR, ioaddr + PAR_DATA);
528 outb((outbyte & 0x0f)|0x40, ioaddr + PAR_DATA);
529 outb(outbyte & 0x0f, ioaddr + PAR_DATA);
531 outb(outbyte & 0x0f, ioaddr + PAR_DATA);
532 outb(Ctrl_HNibWrite + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
533 while (--length > pad_len)
534 write_byte_mode1(ioaddr, *packet++);
536 write_byte_mode1(ioaddr, 0);
538 /* Terminate the Tx frame. End of write: ECB. */
539 outb(0xff, ioaddr + PAR_DATA);
540 outb(Ctrl_HNibWrite | Ctrl_SelData | Ctrl_IRQEN, ioaddr + PAR_CONTROL);
543 static void tx_timeout(struct net_device *dev)
545 struct net_local *np = (struct net_local *)dev->priv;
546 long ioaddr = dev->base_addr;
548 printk(KERN_WARNING "%s: Transmit timed out, %s?\n", dev->name,
549 inb(ioaddr + PAR_CONTROL) & 0x10 ? "network cable problem"
551 np->stats.tx_errors++;
552 /* Try to restart the adapter. */
554 dev->trans_start = jiffies;
555 netif_wake_queue(dev);
556 np->stats.tx_errors++;
559 static int atp_send_packet(struct sk_buff *skb, struct net_device *dev)
561 struct net_local *lp = (struct net_local *)dev->priv;
562 long ioaddr = dev->base_addr;
566 length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
568 netif_stop_queue(dev);
570 /* Disable interrupts by writing 0x00 to the Interrupt Mask Register.
571 This sequence must not be interrupted by an incoming packet. */
573 spin_lock_irqsave(&lp->lock, flags);
574 write_reg(ioaddr, IMR, 0);
575 write_reg_high(ioaddr, IMR, 0);
576 spin_unlock_irqrestore(&lp->lock, flags);
578 write_packet(ioaddr, length, skb->data, length-skb->len, dev->if_port);
580 lp->pac_cnt_in_tx_buf++;
581 if (lp->tx_unit_busy == 0) {
582 trigger_send(ioaddr, length);
583 lp->saved_tx_size = 0; /* Redundant */
585 lp->tx_unit_busy = 1;
587 lp->saved_tx_size = length;
588 /* Re-enable the LPT interrupts. */
589 write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK);
590 write_reg_high(ioaddr, IMR, ISRh_RxErr);
592 dev->trans_start = jiffies;
598 /* The typical workload of the driver:
599 Handle the network interface interrupts. */
600 static void atp_interrupt(int irq, void *dev_instance, struct pt_regs * regs)
602 struct net_device *dev = (struct net_device *)dev_instance;
603 struct net_local *lp;
605 static int num_tx_since_rx;
606 int boguscount = max_interrupt_work;
609 printk(KERN_ERR "ATP_interrupt(): irq %d for unknown device.\n", irq);
612 ioaddr = dev->base_addr;
613 lp = (struct net_local *)dev->priv;
615 spin_lock(&lp->lock);
617 /* Disable additional spurious interrupts. */
618 outb(Ctrl_SelData, ioaddr + PAR_CONTROL);
620 /* The adapter's output is currently the IRQ line, switch it to data. */
621 write_reg(ioaddr, CMR2, CMR2_NULL);
622 write_reg(ioaddr, IMR, 0);
624 if (net_debug > 5) printk(KERN_DEBUG "%s: In interrupt ", dev->name);
625 while (--boguscount > 0) {
626 int status = read_nibble(ioaddr, ISR);
627 if (net_debug > 5) printk("loop status %02x..", status);
629 if (status & (ISR_RxOK<<3)) {
630 write_reg(ioaddr, ISR, ISR_RxOK); /* Clear the Rx interrupt. */
632 int read_status = read_nibble(ioaddr, CMR1);
634 printk("handling Rx packet %02x..", read_status);
635 /* We acknowledged the normal Rx interrupt, so if the interrupt
636 is still outstanding we must have a Rx error. */
637 if (read_status & (CMR1_IRQ << 3)) { /* Overrun. */
638 lp->stats.rx_over_errors++;
639 /* Set to no-accept mode long enough to remove a packet. */
640 write_reg_high(ioaddr, CMR2, CMR2h_OFF);
642 /* Clear the interrupt and return to normal Rx mode. */
643 write_reg_high(ioaddr, ISR, ISRh_RxErr);
644 write_reg_high(ioaddr, CMR2, lp->addr_mode);
645 } else if ((read_status & (CMR1_BufEnb << 3)) == 0) {
650 } while (--boguscount > 0);
651 } else if (status & ((ISR_TxErr + ISR_TxOK)<<3)) {
652 if (net_debug > 6) printk("handling Tx done..");
653 /* Clear the Tx interrupt. We should check for too many failures
654 and reinitialize the adapter. */
655 write_reg(ioaddr, ISR, ISR_TxErr + ISR_TxOK);
656 if (status & (ISR_TxErr<<3)) {
657 lp->stats.collisions++;
658 if (++lp->re_tx > 15) {
659 lp->stats.tx_aborted_errors++;
663 /* Attempt to retransmit. */
664 if (net_debug > 6) printk("attempting to ReTx");
665 write_reg(ioaddr, CMR1, CMR1_ReXmit + CMR1_Xmit);
667 /* Finish up the transmit. */
668 lp->stats.tx_packets++;
669 lp->pac_cnt_in_tx_buf--;
670 if ( lp->saved_tx_size) {
671 trigger_send(ioaddr, lp->saved_tx_size);
672 lp->saved_tx_size = 0;
675 lp->tx_unit_busy = 0;
676 netif_wake_queue(dev); /* Inform upper layers. */
679 } else if (num_tx_since_rx > 8
680 && time_after(jiffies, dev->last_rx + HZ)) {
682 printk(KERN_DEBUG "%s: Missed packet? No Rx after %d Tx and "
683 "%ld jiffies status %02x CMR1 %02x.\n", dev->name,
684 num_tx_since_rx, jiffies - dev->last_rx, status,
685 (read_nibble(ioaddr, CMR1) >> 3) & 15);
686 lp->stats.rx_missed_errors++;
694 /* This following code fixes a rare (and very difficult to track down)
695 problem where the adapter forgets its ethernet address. */
698 for (i = 0; i < 6; i++)
699 write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);
700 #if 0 && defined(TIMED_CHECKER)
701 mod_timer(&lp->timer, RUN_AT(TIMED_CHECKER));
705 /* Tell the adapter that it can go back to using the output line as IRQ. */
706 write_reg(ioaddr, CMR2, CMR2_IRQOUT);
707 /* Enable the physical interrupt line, which is sure to be low until.. */
708 outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
709 /* .. we enable the interrupt sources. */
710 write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK);
711 write_reg_high(ioaddr, IMR, ISRh_RxErr); /* Hmmm, really needed? */
713 spin_unlock(&lp->lock);
715 if (net_debug > 5) printk("exiting interrupt.\n");
720 /* This following code fixes a rare (and very difficult to track down)
721 problem where the adapter forgets its ethernet address. */
722 static void atp_timed_checker(unsigned long data)
724 struct net_device *dev = (struct net_device *)data;
725 long ioaddr = dev->base_addr;
726 struct net_local *lp = (struct net_local *)dev->priv;
727 int tickssofar = jiffies - lp->last_rx_time;
730 spin_lock(&lp->lock);
731 if (tickssofar > 2*HZ) {
733 for (i = 0; i < 6; i++)
734 write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);
735 lp->last_rx_time = jiffies;
737 for (i = 0; i < 6; i++)
738 if (read_cmd_byte(ioaddr, PAR0 + i) != atp_timed_dev->dev_addr[i])
740 struct net_local *lp = (struct net_local *)atp_timed_dev->priv;
741 write_reg_byte(ioaddr, PAR0 + i, atp_timed_dev->dev_addr[i]);
743 lp->stats.tx_errors++;
745 lp->stats.tx_dropped++;
747 lp->stats.collisions++;
749 lp->stats.rx_errors++;
753 spin_unlock(&lp->lock);
754 lp->timer.expires = RUN_AT(TIMED_CHECKER);
755 add_timer(&lp->timer);
759 /* We have a good packet(s), get it/them out of the buffers. */
760 static void net_rx(struct net_device *dev)
762 struct net_local *lp = (struct net_local *)dev->priv;
763 long ioaddr = dev->base_addr;
764 struct rx_header rx_head;
766 /* Process the received packet. */
767 outb(EOC+MAR, ioaddr + PAR_DATA);
768 read_block(ioaddr, 8, (unsigned char*)&rx_head, dev->if_port);
770 printk(KERN_DEBUG " rx_count %04x %04x %04x %04x..", rx_head.pad,
771 rx_head.rx_count, rx_head.rx_status, rx_head.cur_addr);
772 if ((rx_head.rx_status & 0x77) != 0x01) {
773 lp->stats.rx_errors++;
774 if (rx_head.rx_status & 0x0004) lp->stats.rx_frame_errors++;
775 else if (rx_head.rx_status & 0x0002) lp->stats.rx_crc_errors++;
777 printk(KERN_DEBUG "%s: Unknown ATP Rx error %04x.\n",
778 dev->name, rx_head.rx_status);
779 if (rx_head.rx_status & 0x0020) {
780 lp->stats.rx_fifo_errors++;
781 write_reg_high(ioaddr, CMR1, CMR1h_TxENABLE);
782 write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE);
783 } else if (rx_head.rx_status & 0x0050)
787 /* Malloc up new buffer. The "-4" omits the FCS (CRC). */
788 int pkt_len = (rx_head.rx_count & 0x7ff) - 4;
791 skb = dev_alloc_skb(pkt_len + 2);
793 printk(KERN_ERR "%s: Memory squeeze, dropping packet.\n",
795 lp->stats.rx_dropped++;
800 skb_reserve(skb, 2); /* Align IP on 16 byte boundaries */
801 read_block(ioaddr, pkt_len, skb_put(skb,pkt_len), dev->if_port);
802 skb->protocol = eth_type_trans(skb, dev);
804 dev->last_rx = jiffies;
805 lp->stats.rx_packets++;
806 lp->stats.rx_bytes += pkt_len;
809 write_reg(ioaddr, CMR1, CMR1_NextPkt);
810 lp->last_rx_time = jiffies;
814 static void read_block(long ioaddr, int length, unsigned char *p, int data_mode)
817 if (data_mode <= 3) { /* Mode 0 or 1 */
818 outb(Ctrl_LNibRead, ioaddr + PAR_CONTROL);
819 outb(length == 8 ? RdAddr | HNib | MAR : RdAddr | MAR,
821 if (data_mode <= 1) { /* Mode 0 or 1 */
822 do *p++ = read_byte_mode0(ioaddr); while (--length > 0);
823 } else /* Mode 2 or 3 */
824 do *p++ = read_byte_mode2(ioaddr); while (--length > 0);
825 } else if (data_mode <= 5)
826 do *p++ = read_byte_mode4(ioaddr); while (--length > 0);
828 do *p++ = read_byte_mode6(ioaddr); while (--length > 0);
830 outb(EOC+HNib+MAR, ioaddr + PAR_DATA);
831 outb(Ctrl_SelData, ioaddr + PAR_CONTROL);
834 /* The inverse routine to net_open(). */
836 net_close(struct net_device *dev)
838 struct net_local *lp = (struct net_local *)dev->priv;
839 long ioaddr = dev->base_addr;
841 netif_stop_queue(dev);
843 del_timer_sync(&lp->timer);
845 /* Flush the Tx and disable Rx here. */
846 lp->addr_mode = CMR2h_OFF;
847 write_reg_high(ioaddr, CMR2, CMR2h_OFF);
849 /* Free the IRQ line. */
850 outb(0x00, ioaddr + PAR_CONTROL);
851 free_irq(dev->irq, dev);
853 /* Reset the ethernet hardware and activate the printer pass-through. */
854 write_reg_high(ioaddr, CMR1, CMR1h_RESET | CMR1h_MUX);
858 /* Get the current statistics. This may be called with the card open or
860 static struct net_device_stats *
861 net_get_stats(struct net_device *dev)
863 struct net_local *lp = (struct net_local *)dev->priv;
868 * Set or clear the multicast filter for this adapter.
871 static void set_rx_mode_8002(struct net_device *dev)
873 struct net_local *lp = (struct net_local *)dev->priv;
874 long ioaddr = dev->base_addr;
876 if ( dev->mc_count > 0 || (dev->flags & (IFF_ALLMULTI|IFF_PROMISC))) {
877 /* We must make the kernel realise we had to move
878 * into promisc mode or we start all out war on
881 dev->flags|=IFF_PROMISC;
882 lp->addr_mode = CMR2h_PROMISC;
884 lp->addr_mode = CMR2h_Normal;
885 write_reg_high(ioaddr, CMR2, lp->addr_mode);
888 static void set_rx_mode_8012(struct net_device *dev)
890 struct net_local *lp = (struct net_local *)dev->priv;
891 long ioaddr = dev->base_addr;
892 unsigned char new_mode, mc_filter[8]; /* Multicast hash filter */
895 if (dev->flags & IFF_PROMISC) { /* Set promiscuous. */
896 new_mode = CMR2h_PROMISC;
897 } else if ((dev->mc_count > 1000) || (dev->flags & IFF_ALLMULTI)) {
898 /* Too many to filter perfectly -- accept all multicasts. */
899 memset(mc_filter, 0xff, sizeof(mc_filter));
900 new_mode = CMR2h_Normal;
902 struct dev_mc_list *mclist;
904 memset(mc_filter, 0, sizeof(mc_filter));
905 for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
906 i++, mclist = mclist->next)
907 set_bit(ether_crc_le(ETH_ALEN, mclist->dmi_addr) & 0x3f,
909 new_mode = CMR2h_Normal;
911 lp->addr_mode = new_mode;
912 write_reg(ioaddr, CMR2, CMR2_IRQOUT | 0x04); /* Switch to page 1. */
913 for (i = 0; i < 8; i++)
914 write_reg_byte(ioaddr, i, mc_filter[i]);
915 if (net_debug > 2 || 1) {
917 printk(KERN_DEBUG "%s: Mode %d, setting multicast filter to",
918 dev->name, lp->addr_mode);
919 for (i = 0; i < 8; i++)
920 printk(" %2.2x", mc_filter[i]);
924 write_reg_high(ioaddr, CMR2, lp->addr_mode);
925 write_reg(ioaddr, CMR2, CMR2_IRQOUT); /* Switch back to page 0 */
928 static int __init atp_init_module(void) {
929 if (debug) /* Emit version even if no cards detected. */
930 printk(KERN_INFO "%s" KERN_INFO "%s", versionA, versionB);
931 return atp_init(NULL);
934 static void __exit atp_cleanup_module(void) {
935 struct net_device *next_dev;
937 while (root_atp_dev) {
938 next_dev = ((struct net_local *)root_atp_dev->priv)->next_module;
939 unregister_netdev(root_atp_dev);
940 /* No need to release_region(), since we never snarf it. */
942 root_atp_dev = next_dev;
946 module_init(atp_init_module);
947 module_exit(atp_cleanup_module);