1 static const char version[] = "de600.c: $Revision: 1.41-2.5 $, Bjorn Ekwall (bj0rn@blox.se)\n";
5 * Linux driver for the D-Link DE-600 Ethernet pocket adapter.
7 * Portions (C) Copyright 1993, 1994 by Bjorn Ekwall
8 * The Author may be reached as bj0rn@blox.se
10 * Based on adapter information gathered from DE600.ASM by D-Link Inc.,
11 * as included on disk C in the v.2.11 of PC/TCP from FTP Software.
13 * Portions (C) Copyright 1990 D-Link, Inc.
14 * Copyright, 1988-1992, Russell Nelson, Crynwr Software
16 * Adapted to the sample network driver core for linux,
17 * written by: Donald Becker <becker@super.org>
18 * (Now at <becker@scyld.com>)
20 **************************************************************/
22 * This program is free software; you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License as published by
24 * the Free Software Foundation; either version 2, or (at your option)
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
36 **************************************************************/
38 /* Add more time here if your adapter won't work OK: */
39 #define DE600_SLOW_DOWN udelay(delay_time)
41 /* use 0 for production, 1 for verification, >2 for debug */
43 #define PRINTK(x) if (de600_debug >= 2) printk x
46 #define PRINTK(x) /**/
49 #include <linux/module.h>
50 #include <linux/kernel.h>
51 #include <linux/types.h>
52 #include <linux/fcntl.h>
53 #include <linux/string.h>
54 #include <linux/interrupt.h>
55 #include <linux/ioport.h>
57 #include <asm/system.h>
58 #include <linux/errno.h>
59 #include <linux/init.h>
60 #include <linux/delay.h>
61 #include <linux/inet.h>
62 #include <linux/netdevice.h>
63 #include <linux/etherdevice.h>
64 #include <linux/skbuff.h>
70 static unsigned int de600_debug = DE600_DEBUG;
71 module_param(de600_debug, int, 0);
72 MODULE_PARM_DESC(de600_debug, "DE-600 debug level (0-2)");
74 static unsigned int check_lost = 1;
75 module_param(check_lost, bool, 0);
76 MODULE_PARM_DESC(check_lost, "If set then check for unplugged de600");
78 static unsigned int delay_time = 10;
79 module_param(delay_time, int, 0);
80 MODULE_PARM_DESC(delay_time, "DE-600 deley on I/O in microseconds");
84 * D-Link driver variables:
87 static volatile int rx_page;
90 static volatile int tx_fifo[TX_PAGES];
91 static volatile int tx_fifo_in;
92 static volatile int tx_fifo_out;
93 static volatile int free_tx_pages = TX_PAGES;
95 static DEFINE_SPINLOCK(de600_lock);
97 static inline u8 de600_read_status(struct net_device *dev)
101 outb_p(STATUS, DATA_PORT);
102 status = inb(STATUS_PORT);
103 outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
108 static inline u8 de600_read_byte(unsigned char type, struct net_device *dev)
110 /* dev used by macros */
112 outb_p((type), DATA_PORT);
113 lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
114 outb_p((type) | HI_NIBBLE, DATA_PORT);
115 return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
119 * Open/initialize the board. This is called (in the current kernel)
120 * after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
122 * This routine should set everything up anew at each open, even
123 * registers that "should" only need to be set once at boot, so that
124 * there is a non-reboot way to recover if something goes wrong.
127 static int de600_open(struct net_device *dev)
130 int ret = request_irq(DE600_IRQ, de600_interrupt, 0, dev->name, dev);
132 printk(KERN_ERR "%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
135 spin_lock_irqsave(&de600_lock, flags);
136 ret = adapter_init(dev);
137 spin_unlock_irqrestore(&de600_lock, flags);
142 * The inverse routine to de600_open().
145 static int de600_close(struct net_device *dev)
149 de600_put_command(RESET);
150 de600_put_command(STOP_RESET);
151 de600_put_command(0);
153 free_irq(DE600_IRQ, dev);
157 static struct net_device_stats *get_stats(struct net_device *dev)
159 return (struct net_device_stats *)(dev->priv);
162 static inline void trigger_interrupt(struct net_device *dev)
164 de600_put_command(FLIP_IRQ);
168 de600_put_command(0);
172 * Copy a buffer to the adapter transmit page memory.
176 static int de600_start_xmit(struct sk_buff *skb, struct net_device *dev)
182 u8 *buffer = skb->data;
185 if (free_tx_pages <= 0) { /* Do timeouts, to avoid hangs. */
186 tickssofar = jiffies - dev->trans_start;
190 printk(KERN_WARNING "%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem");
191 /* Restart the adapter. */
192 spin_lock_irqsave(&de600_lock, flags);
193 if (adapter_init(dev)) {
194 spin_unlock_irqrestore(&de600_lock, flags);
197 spin_unlock_irqrestore(&de600_lock, flags);
200 /* Start real output */
201 PRINTK(("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages));
203 if ((len = skb->len) < RUNT)
206 spin_lock_irqsave(&de600_lock, flags);
208 tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
209 tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
213 /* This costs about 40 instructions per packet... */
214 de600_setup_address(NODE_ADDRESS, RW_ADDR);
215 de600_read_byte(READ_DATA, dev);
216 if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
217 if (adapter_init(dev)) {
218 spin_unlock_irqrestore(&de600_lock, flags);
224 de600_setup_address(transmit_from, RW_ADDR);
225 for (i = 0; i < skb->len ; ++i, ++buffer)
226 de600_put_byte(*buffer);
230 if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
231 dev->trans_start = jiffies;
232 netif_start_queue(dev); /* allow more packets into adapter */
233 /* Send page and generate a faked interrupt */
234 de600_setup_address(transmit_from, TX_ADDR);
235 de600_put_command(TX_ENABLE);
239 netif_start_queue(dev);
241 netif_stop_queue(dev);
244 spin_unlock_irqrestore(&de600_lock, flags);
250 * The typical workload of the driver:
251 * Handle the network interface interrupts.
254 static irqreturn_t de600_interrupt(int irq, void *dev_id)
256 struct net_device *dev = dev_id;
261 spin_lock(&de600_lock);
264 irq_status = de600_read_status(dev);
267 PRINTK(("de600_interrupt (%02X)\n", irq_status));
269 if (irq_status & RX_GOOD)
271 else if (!(irq_status & RX_BUSY))
272 de600_put_command(RX_ENABLE);
274 /* Any transmission in progress? */
275 if (free_tx_pages < TX_PAGES)
276 retrig = de600_tx_intr(dev, irq_status);
280 irq_status = de600_read_status(dev);
281 } while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
283 * Yeah, it _looks_ like busy waiting, smells like busy waiting
284 * and I know it's not PC, but please, it will only occur once
285 * in a while and then only for a loop or so (< 1ms for sure!)
288 /* Enable adapter interrupts */
291 trigger_interrupt(dev);
292 spin_unlock(&de600_lock);
296 static int de600_tx_intr(struct net_device *dev, int irq_status)
299 * Returns 1 if tx still not done
302 /* Check if current transmission is done yet */
303 if (irq_status & TX_BUSY)
304 return 1; /* tx not done, try again */
307 /* If last transmission OK then bump fifo index */
308 if (!(irq_status & TX_FAILED16)) {
309 tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
311 ((struct net_device_stats *)(dev->priv))->tx_packets++;
312 netif_wake_queue(dev);
315 /* More to send, or resend last packet? */
316 if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
317 dev->trans_start = jiffies;
318 de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
319 de600_put_command(TX_ENABLE);
328 * We have a good packet, get it out of the adapter.
330 static void de600_rx_intr(struct net_device *dev)
336 unsigned char *buffer;
338 /* Get size of received packet */
339 size = de600_read_byte(RX_LEN, dev); /* low byte */
340 size += (de600_read_byte(RX_LEN, dev) << 8); /* high byte */
341 size -= 4; /* Ignore trailing 4 CRC-bytes */
343 /* Tell adapter where to store next incoming packet, enable receiver */
344 read_from = rx_page_adr();
346 de600_put_command(RX_ENABLE);
348 if ((size < 32) || (size > 1535)) {
349 printk(KERN_WARNING "%s: Bogus packet size %d.\n", dev->name, size);
355 skb = dev_alloc_skb(size+2);
357 printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
362 skb_reserve(skb,2); /* Align */
364 /* 'skb->data' points to the start of sk_buff data area. */
365 buffer = skb_put(skb,size);
367 /* copy the packet into the buffer */
368 de600_setup_address(read_from, RW_ADDR);
369 for (i = size; i > 0; --i, ++buffer)
370 *buffer = de600_read_byte(READ_DATA, dev);
372 skb->protocol=eth_type_trans(skb,dev);
377 dev->last_rx = jiffies;
378 ((struct net_device_stats *)(dev->priv))->rx_packets++; /* count all receives */
379 ((struct net_device_stats *)(dev->priv))->rx_bytes += size; /* count all received bytes */
382 * If any worth-while packets have been received, netif_rx()
383 * will work on them when we get to the tasklets.
387 static struct net_device * __init de600_probe(void)
390 struct net_device *dev;
393 dev = alloc_etherdev(sizeof(struct net_device_stats));
395 return ERR_PTR(-ENOMEM);
397 SET_MODULE_OWNER(dev);
399 if (!request_region(DE600_IO, 3, "de600")) {
400 printk(KERN_WARNING "DE600: port 0x%x busy\n", DE600_IO);
405 printk(KERN_INFO "%s: D-Link DE-600 pocket adapter", dev->name);
406 /* Alpha testers must have the version number to report bugs. */
410 /* probe for adapter */
414 (void)de600_read_status(dev);
415 de600_put_command(RESET);
416 de600_put_command(STOP_RESET);
417 if (de600_read_status(dev) & 0xf0) {
418 printk(": not at I/O %#3x.\n", DATA_PORT);
423 * Maybe we found one,
424 * have to check if it is a D-Link DE-600 adapter...
427 /* Get the adapter ethernet address from the ROM */
428 de600_setup_address(NODE_ADDRESS, RW_ADDR);
429 for (i = 0; i < ETH_ALEN; i++) {
430 dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
431 dev->broadcast[i] = 0xff;
434 /* Check magic code */
435 if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
436 /* OK, install real address */
437 dev->dev_addr[0] = 0x00;
438 dev->dev_addr[1] = 0x80;
439 dev->dev_addr[2] = 0xc8;
440 dev->dev_addr[3] &= 0x0f;
441 dev->dev_addr[3] |= 0x70;
443 printk(" not identified in the printer port\n");
447 printk(", Ethernet Address: %02X", dev->dev_addr[0]);
448 for (i = 1; i < ETH_ALEN; i++)
449 printk(":%02X",dev->dev_addr[i]);
452 dev->get_stats = get_stats;
454 dev->open = de600_open;
455 dev->stop = de600_close;
456 dev->hard_start_xmit = &de600_start_xmit;
458 dev->flags&=~IFF_MULTICAST;
462 err = register_netdev(dev);
469 release_region(DE600_IO, 3);
475 static int adapter_init(struct net_device *dev)
480 rx_page = 0; /* used by RESET */
481 de600_put_command(RESET);
482 de600_put_command(STOP_RESET);
484 /* Check if it is still there... */
485 /* Get the some bytes of the adapter ethernet address from the ROM */
486 de600_setup_address(NODE_ADDRESS, RW_ADDR);
487 de600_read_byte(READ_DATA, dev);
488 if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
489 (de600_read_byte(READ_DATA, dev) != 0x15)) {
490 /* was: if (de600_read_status(dev) & 0xf0) { */
491 printk("Something has happened to the DE-600! Please check it and do a new ifconfig!\n");
492 /* Goodbye, cruel world... */
493 dev->flags &= ~IFF_UP;
496 netif_stop_queue(dev); /* Transmit busy... */
497 return 1; /* failed */
501 printk(KERN_INFO "%s: Thanks, I feel much better now!\n", dev->name);
507 free_tx_pages = TX_PAGES;
510 /* set the ether address. */
511 de600_setup_address(NODE_ADDRESS, RW_ADDR);
512 for (i = 0; i < ETH_ALEN; i++)
513 de600_put_byte(dev->dev_addr[i]);
515 /* where to start saving incoming packets */
516 rx_page = RX_BP | RX_BASE_PAGE;
517 de600_setup_address(MEM_4K, RW_ADDR);
518 /* Enable receiver */
519 de600_put_command(RX_ENABLE);
522 netif_start_queue(dev);
527 static struct net_device *de600_dev;
529 static int __init de600_init(void)
531 de600_dev = de600_probe();
532 if (IS_ERR(de600_dev))
533 return PTR_ERR(de600_dev);
537 static void __exit de600_exit(void)
539 unregister_netdev(de600_dev);
540 release_region(DE600_IO, 3);
541 free_netdev(de600_dev);
544 module_init(de600_init);
545 module_exit(de600_exit);
547 MODULE_LICENSE("GPL");