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 #include <linux/module.h>
42 #include <linux/kernel.h>
43 #include <linux/types.h>
44 #include <linux/fcntl.h>
45 #include <linux/string.h>
46 #include <linux/interrupt.h>
47 #include <linux/ioport.h>
49 #include <asm/system.h>
50 #include <linux/errno.h>
51 #include <linux/init.h>
52 #include <linux/delay.h>
53 #include <linux/inet.h>
54 #include <linux/netdevice.h>
55 #include <linux/etherdevice.h>
56 #include <linux/skbuff.h>
62 static unsigned int check_lost = 1;
63 module_param(check_lost, bool, 0);
64 MODULE_PARM_DESC(check_lost, "If set then check for unplugged de600");
66 static unsigned int delay_time = 10;
67 module_param(delay_time, int, 0);
68 MODULE_PARM_DESC(delay_time, "DE-600 deley on I/O in microseconds");
72 * D-Link driver variables:
75 static volatile int rx_page;
78 static volatile int tx_fifo[TX_PAGES];
79 static volatile int tx_fifo_in;
80 static volatile int tx_fifo_out;
81 static volatile int free_tx_pages = TX_PAGES;
83 static DEFINE_SPINLOCK(de600_lock);
85 static inline u8 de600_read_status(struct net_device *dev)
89 outb_p(STATUS, DATA_PORT);
90 status = inb(STATUS_PORT);
91 outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
96 static inline u8 de600_read_byte(unsigned char type, struct net_device *dev)
98 /* dev used by macros */
100 outb_p((type), DATA_PORT);
101 lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
102 outb_p((type) | HI_NIBBLE, DATA_PORT);
103 return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
107 * Open/initialize the board. This is called (in the current kernel)
108 * after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
110 * This routine should set everything up anew at each open, even
111 * registers that "should" only need to be set once at boot, so that
112 * there is a non-reboot way to recover if something goes wrong.
115 static int de600_open(struct net_device *dev)
118 int ret = request_irq(DE600_IRQ, de600_interrupt, 0, dev->name, dev);
120 printk(KERN_ERR "%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
123 spin_lock_irqsave(&de600_lock, flags);
124 ret = adapter_init(dev);
125 spin_unlock_irqrestore(&de600_lock, flags);
130 * The inverse routine to de600_open().
133 static int de600_close(struct net_device *dev)
137 de600_put_command(RESET);
138 de600_put_command(STOP_RESET);
139 de600_put_command(0);
141 free_irq(DE600_IRQ, dev);
145 static inline void trigger_interrupt(struct net_device *dev)
147 de600_put_command(FLIP_IRQ);
151 de600_put_command(0);
155 * Copy a buffer to the adapter transmit page memory.
159 static int de600_start_xmit(struct sk_buff *skb, struct net_device *dev)
165 u8 *buffer = skb->data;
168 if (free_tx_pages <= 0) { /* Do timeouts, to avoid hangs. */
169 tickssofar = jiffies - dev->trans_start;
171 return NETDEV_TX_BUSY;
173 printk(KERN_WARNING "%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem");
174 /* Restart the adapter. */
175 spin_lock_irqsave(&de600_lock, flags);
176 if (adapter_init(dev)) {
177 spin_unlock_irqrestore(&de600_lock, flags);
178 return NETDEV_TX_BUSY;
180 spin_unlock_irqrestore(&de600_lock, flags);
183 /* Start real output */
184 pr_debug("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages);
186 if ((len = skb->len) < RUNT)
189 spin_lock_irqsave(&de600_lock, flags);
191 tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
192 tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
196 /* This costs about 40 instructions per packet... */
197 de600_setup_address(NODE_ADDRESS, RW_ADDR);
198 de600_read_byte(READ_DATA, dev);
199 if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
200 if (adapter_init(dev)) {
201 spin_unlock_irqrestore(&de600_lock, flags);
202 return NETDEV_TX_BUSY;
207 de600_setup_address(transmit_from, RW_ADDR);
208 for (i = 0; i < skb->len ; ++i, ++buffer)
209 de600_put_byte(*buffer);
213 if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
214 dev->trans_start = jiffies;
215 netif_start_queue(dev); /* allow more packets into adapter */
216 /* Send page and generate a faked interrupt */
217 de600_setup_address(transmit_from, TX_ADDR);
218 de600_put_command(TX_ENABLE);
222 netif_start_queue(dev);
224 netif_stop_queue(dev);
227 spin_unlock_irqrestore(&de600_lock, flags);
233 * The typical workload of the driver:
234 * Handle the network interface interrupts.
237 static irqreturn_t de600_interrupt(int irq, void *dev_id)
239 struct net_device *dev = dev_id;
244 spin_lock(&de600_lock);
247 irq_status = de600_read_status(dev);
250 pr_debug("de600_interrupt (%02X)\n", irq_status);
252 if (irq_status & RX_GOOD)
254 else if (!(irq_status & RX_BUSY))
255 de600_put_command(RX_ENABLE);
257 /* Any transmission in progress? */
258 if (free_tx_pages < TX_PAGES)
259 retrig = de600_tx_intr(dev, irq_status);
263 irq_status = de600_read_status(dev);
264 } while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
266 * Yeah, it _looks_ like busy waiting, smells like busy waiting
267 * and I know it's not PC, but please, it will only occur once
268 * in a while and then only for a loop or so (< 1ms for sure!)
271 /* Enable adapter interrupts */
274 trigger_interrupt(dev);
275 spin_unlock(&de600_lock);
279 static int de600_tx_intr(struct net_device *dev, int irq_status)
282 * Returns 1 if tx still not done
285 /* Check if current transmission is done yet */
286 if (irq_status & TX_BUSY)
287 return 1; /* tx not done, try again */
290 /* If last transmission OK then bump fifo index */
291 if (!(irq_status & TX_FAILED16)) {
292 tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
294 dev->stats.tx_packets++;
295 netif_wake_queue(dev);
298 /* More to send, or resend last packet? */
299 if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
300 dev->trans_start = jiffies;
301 de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
302 de600_put_command(TX_ENABLE);
311 * We have a good packet, get it out of the adapter.
313 static void de600_rx_intr(struct net_device *dev)
319 unsigned char *buffer;
321 /* Get size of received packet */
322 size = de600_read_byte(RX_LEN, dev); /* low byte */
323 size += (de600_read_byte(RX_LEN, dev) << 8); /* high byte */
324 size -= 4; /* Ignore trailing 4 CRC-bytes */
326 /* Tell adapter where to store next incoming packet, enable receiver */
327 read_from = rx_page_adr();
329 de600_put_command(RX_ENABLE);
331 if ((size < 32) || (size > 1535)) {
332 printk(KERN_WARNING "%s: Bogus packet size %d.\n", dev->name, size);
338 skb = dev_alloc_skb(size+2);
340 printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
345 skb_reserve(skb,2); /* Align */
347 /* 'skb->data' points to the start of sk_buff data area. */
348 buffer = skb_put(skb,size);
350 /* copy the packet into the buffer */
351 de600_setup_address(read_from, RW_ADDR);
352 for (i = size; i > 0; --i, ++buffer)
353 *buffer = de600_read_byte(READ_DATA, dev);
355 skb->protocol=eth_type_trans(skb,dev);
360 dev->stats.rx_packets++; /* count all receives */
361 dev->stats.rx_bytes += size; /* count all received bytes */
364 * If any worth-while packets have been received, netif_rx()
365 * will work on them when we get to the tasklets.
369 static const struct net_device_ops de600_netdev_ops = {
370 .ndo_open = de600_open,
371 .ndo_stop = de600_close,
372 .ndo_start_xmit = de600_start_xmit,
373 .ndo_change_mtu = eth_change_mtu,
374 .ndo_set_mac_address = eth_mac_addr,
375 .ndo_validate_addr = eth_validate_addr,
379 static struct net_device * __init de600_probe(void)
382 struct net_device *dev;
385 dev = alloc_etherdev(0);
387 return ERR_PTR(-ENOMEM);
390 if (!request_region(DE600_IO, 3, "de600")) {
391 printk(KERN_WARNING "DE600: port 0x%x busy\n", DE600_IO);
396 printk(KERN_INFO "%s: D-Link DE-600 pocket adapter", dev->name);
397 /* Alpha testers must have the version number to report bugs. */
398 pr_debug("%s", version);
400 /* probe for adapter */
404 (void)de600_read_status(dev);
405 de600_put_command(RESET);
406 de600_put_command(STOP_RESET);
407 if (de600_read_status(dev) & 0xf0) {
408 printk(": not at I/O %#3x.\n", DATA_PORT);
413 * Maybe we found one,
414 * have to check if it is a D-Link DE-600 adapter...
417 /* Get the adapter ethernet address from the ROM */
418 de600_setup_address(NODE_ADDRESS, RW_ADDR);
419 for (i = 0; i < ETH_ALEN; i++) {
420 dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
421 dev->broadcast[i] = 0xff;
424 /* Check magic code */
425 if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
426 /* OK, install real address */
427 dev->dev_addr[0] = 0x00;
428 dev->dev_addr[1] = 0x80;
429 dev->dev_addr[2] = 0xc8;
430 dev->dev_addr[3] &= 0x0f;
431 dev->dev_addr[3] |= 0x70;
433 printk(" not identified in the printer port\n");
437 printk(", Ethernet Address: %pM\n", dev->dev_addr);
439 dev->netdev_ops = &de600_netdev_ops;
441 dev->flags&=~IFF_MULTICAST;
445 err = register_netdev(dev);
452 release_region(DE600_IO, 3);
458 static int adapter_init(struct net_device *dev)
463 rx_page = 0; /* used by RESET */
464 de600_put_command(RESET);
465 de600_put_command(STOP_RESET);
467 /* Check if it is still there... */
468 /* Get the some bytes of the adapter ethernet address from the ROM */
469 de600_setup_address(NODE_ADDRESS, RW_ADDR);
470 de600_read_byte(READ_DATA, dev);
471 if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
472 (de600_read_byte(READ_DATA, dev) != 0x15)) {
473 /* was: if (de600_read_status(dev) & 0xf0) { */
474 printk("Something has happened to the DE-600! Please check it and do a new ifconfig!\n");
475 /* Goodbye, cruel world... */
476 dev->flags &= ~IFF_UP;
479 netif_stop_queue(dev); /* Transmit busy... */
480 return 1; /* failed */
484 printk(KERN_INFO "%s: Thanks, I feel much better now!\n", dev->name);
490 free_tx_pages = TX_PAGES;
493 /* set the ether address. */
494 de600_setup_address(NODE_ADDRESS, RW_ADDR);
495 for (i = 0; i < ETH_ALEN; i++)
496 de600_put_byte(dev->dev_addr[i]);
498 /* where to start saving incoming packets */
499 rx_page = RX_BP | RX_BASE_PAGE;
500 de600_setup_address(MEM_4K, RW_ADDR);
501 /* Enable receiver */
502 de600_put_command(RX_ENABLE);
505 netif_start_queue(dev);
510 static struct net_device *de600_dev;
512 static int __init de600_init(void)
514 de600_dev = de600_probe();
515 if (IS_ERR(de600_dev))
516 return PTR_ERR(de600_dev);
520 static void __exit de600_exit(void)
522 unregister_netdev(de600_dev);
523 release_region(DE600_IO, 3);
524 free_netdev(de600_dev);
527 module_init(de600_init);
528 module_exit(de600_exit);
530 MODULE_LICENSE("GPL");