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 inline void trigger_interrupt(struct net_device *dev)
159 de600_put_command(FLIP_IRQ);
163 de600_put_command(0);
167 * Copy a buffer to the adapter transmit page memory.
171 static int de600_start_xmit(struct sk_buff *skb, struct net_device *dev)
177 u8 *buffer = skb->data;
180 if (free_tx_pages <= 0) { /* Do timeouts, to avoid hangs. */
181 tickssofar = jiffies - dev->trans_start;
185 printk(KERN_WARNING "%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem");
186 /* Restart the adapter. */
187 spin_lock_irqsave(&de600_lock, flags);
188 if (adapter_init(dev)) {
189 spin_unlock_irqrestore(&de600_lock, flags);
192 spin_unlock_irqrestore(&de600_lock, flags);
195 /* Start real output */
196 PRINTK(("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages));
198 if ((len = skb->len) < RUNT)
201 spin_lock_irqsave(&de600_lock, flags);
203 tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
204 tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
208 /* This costs about 40 instructions per packet... */
209 de600_setup_address(NODE_ADDRESS, RW_ADDR);
210 de600_read_byte(READ_DATA, dev);
211 if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
212 if (adapter_init(dev)) {
213 spin_unlock_irqrestore(&de600_lock, flags);
219 de600_setup_address(transmit_from, RW_ADDR);
220 for (i = 0; i < skb->len ; ++i, ++buffer)
221 de600_put_byte(*buffer);
225 if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
226 dev->trans_start = jiffies;
227 netif_start_queue(dev); /* allow more packets into adapter */
228 /* Send page and generate a faked interrupt */
229 de600_setup_address(transmit_from, TX_ADDR);
230 de600_put_command(TX_ENABLE);
234 netif_start_queue(dev);
236 netif_stop_queue(dev);
239 spin_unlock_irqrestore(&de600_lock, flags);
245 * The typical workload of the driver:
246 * Handle the network interface interrupts.
249 static irqreturn_t de600_interrupt(int irq, void *dev_id)
251 struct net_device *dev = dev_id;
256 spin_lock(&de600_lock);
259 irq_status = de600_read_status(dev);
262 PRINTK(("de600_interrupt (%02X)\n", irq_status));
264 if (irq_status & RX_GOOD)
266 else if (!(irq_status & RX_BUSY))
267 de600_put_command(RX_ENABLE);
269 /* Any transmission in progress? */
270 if (free_tx_pages < TX_PAGES)
271 retrig = de600_tx_intr(dev, irq_status);
275 irq_status = de600_read_status(dev);
276 } while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
278 * Yeah, it _looks_ like busy waiting, smells like busy waiting
279 * and I know it's not PC, but please, it will only occur once
280 * in a while and then only for a loop or so (< 1ms for sure!)
283 /* Enable adapter interrupts */
286 trigger_interrupt(dev);
287 spin_unlock(&de600_lock);
291 static int de600_tx_intr(struct net_device *dev, int irq_status)
294 * Returns 1 if tx still not done
297 /* Check if current transmission is done yet */
298 if (irq_status & TX_BUSY)
299 return 1; /* tx not done, try again */
302 /* If last transmission OK then bump fifo index */
303 if (!(irq_status & TX_FAILED16)) {
304 tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
306 dev->stats.tx_packets++;
307 netif_wake_queue(dev);
310 /* More to send, or resend last packet? */
311 if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
312 dev->trans_start = jiffies;
313 de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
314 de600_put_command(TX_ENABLE);
323 * We have a good packet, get it out of the adapter.
325 static void de600_rx_intr(struct net_device *dev)
331 unsigned char *buffer;
333 /* Get size of received packet */
334 size = de600_read_byte(RX_LEN, dev); /* low byte */
335 size += (de600_read_byte(RX_LEN, dev) << 8); /* high byte */
336 size -= 4; /* Ignore trailing 4 CRC-bytes */
338 /* Tell adapter where to store next incoming packet, enable receiver */
339 read_from = rx_page_adr();
341 de600_put_command(RX_ENABLE);
343 if ((size < 32) || (size > 1535)) {
344 printk(KERN_WARNING "%s: Bogus packet size %d.\n", dev->name, size);
350 skb = dev_alloc_skb(size+2);
352 printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
357 skb_reserve(skb,2); /* Align */
359 /* 'skb->data' points to the start of sk_buff data area. */
360 buffer = skb_put(skb,size);
362 /* copy the packet into the buffer */
363 de600_setup_address(read_from, RW_ADDR);
364 for (i = size; i > 0; --i, ++buffer)
365 *buffer = de600_read_byte(READ_DATA, dev);
367 skb->protocol=eth_type_trans(skb,dev);
372 dev->stats.rx_packets++; /* count all receives */
373 dev->stats.rx_bytes += size; /* count all received bytes */
376 * If any worth-while packets have been received, netif_rx()
377 * will work on them when we get to the tasklets.
381 static struct net_device * __init de600_probe(void)
384 struct net_device *dev;
387 dev = alloc_etherdev(0);
389 return ERR_PTR(-ENOMEM);
392 if (!request_region(DE600_IO, 3, "de600")) {
393 printk(KERN_WARNING "DE600: port 0x%x busy\n", DE600_IO);
398 printk(KERN_INFO "%s: D-Link DE-600 pocket adapter", dev->name);
399 /* Alpha testers must have the version number to report bugs. */
403 /* probe for adapter */
407 (void)de600_read_status(dev);
408 de600_put_command(RESET);
409 de600_put_command(STOP_RESET);
410 if (de600_read_status(dev) & 0xf0) {
411 printk(": not at I/O %#3x.\n", DATA_PORT);
416 * Maybe we found one,
417 * have to check if it is a D-Link DE-600 adapter...
420 /* Get the adapter ethernet address from the ROM */
421 de600_setup_address(NODE_ADDRESS, RW_ADDR);
422 for (i = 0; i < ETH_ALEN; i++) {
423 dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
424 dev->broadcast[i] = 0xff;
427 /* Check magic code */
428 if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
429 /* OK, install real address */
430 dev->dev_addr[0] = 0x00;
431 dev->dev_addr[1] = 0x80;
432 dev->dev_addr[2] = 0xc8;
433 dev->dev_addr[3] &= 0x0f;
434 dev->dev_addr[3] |= 0x70;
436 printk(" not identified in the printer port\n");
440 printk(", Ethernet Address: %pM\n", dev->dev_addr);
442 dev->open = de600_open;
443 dev->stop = de600_close;
444 dev->hard_start_xmit = &de600_start_xmit;
446 dev->flags&=~IFF_MULTICAST;
450 err = register_netdev(dev);
457 release_region(DE600_IO, 3);
463 static int adapter_init(struct net_device *dev)
468 rx_page = 0; /* used by RESET */
469 de600_put_command(RESET);
470 de600_put_command(STOP_RESET);
472 /* Check if it is still there... */
473 /* Get the some bytes of the adapter ethernet address from the ROM */
474 de600_setup_address(NODE_ADDRESS, RW_ADDR);
475 de600_read_byte(READ_DATA, dev);
476 if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
477 (de600_read_byte(READ_DATA, dev) != 0x15)) {
478 /* was: if (de600_read_status(dev) & 0xf0) { */
479 printk("Something has happened to the DE-600! Please check it and do a new ifconfig!\n");
480 /* Goodbye, cruel world... */
481 dev->flags &= ~IFF_UP;
484 netif_stop_queue(dev); /* Transmit busy... */
485 return 1; /* failed */
489 printk(KERN_INFO "%s: Thanks, I feel much better now!\n", dev->name);
495 free_tx_pages = TX_PAGES;
498 /* set the ether address. */
499 de600_setup_address(NODE_ADDRESS, RW_ADDR);
500 for (i = 0; i < ETH_ALEN; i++)
501 de600_put_byte(dev->dev_addr[i]);
503 /* where to start saving incoming packets */
504 rx_page = RX_BP | RX_BASE_PAGE;
505 de600_setup_address(MEM_4K, RW_ADDR);
506 /* Enable receiver */
507 de600_put_command(RX_ENABLE);
510 netif_start_queue(dev);
515 static struct net_device *de600_dev;
517 static int __init de600_init(void)
519 de600_dev = de600_probe();
520 if (IS_ERR(de600_dev))
521 return PTR_ERR(de600_dev);
525 static void __exit de600_exit(void)
527 unregister_netdev(de600_dev);
528 release_region(DE600_IO, 3);
529 free_netdev(de600_dev);
532 module_init(de600_init);
533 module_exit(de600_exit);
535 MODULE_LICENSE("GPL");