1 /* mac89x0.c: A Crystal Semiconductor CS89[02]0 driver for linux. */
3 Written 1996 by Russell Nelson, with reference to skeleton.c
4 written 1993-1994 by Donald Becker.
6 This software may be used and distributed according to the terms
7 of the GNU General Public License, incorporated herein by reference.
9 The author may be reached at nelson@crynwr.com, Crynwr
10 Software, 11 Grant St., Potsdam, NY 13676
14 Mike Cruse : mcruse@cti-ltd.com
15 : Changes for Linux 2.0 compatibility.
16 : Added dev_id parameter in net_interrupt(),
17 : request_irq() and free_irq(). Just NULL for now.
19 Mike Cruse : Added MOD_INC_USE_COUNT and MOD_DEC_USE_COUNT macros
20 : in net_open() and net_close() so kerneld would know
21 : that the module is in use and wouldn't eject the
24 Mike Cruse : Rewrote init_module() and cleanup_module using 8390.c
25 : as an example. Disabled autoprobing in init_module(),
26 : not a good thing to do to other devices while Linux
27 : is running from all accounts.
29 Alan Cox : Removed 1.2 support, added 2.1 extra counters.
31 David Huggins-Daines <dhd@debian.org>
33 Split this off into mac89x0.c, and gutted it of all parts which are
34 not relevant to the existing CS8900 cards on the Macintosh
35 (i.e. basically the Daynaport CS and LC cards). To be precise:
37 * Removed all the media-detection stuff, because these cards are
40 * Lobotomized the ISA interrupt bogosity, because these cards use
41 a hardwired NuBus interrupt and a magic ISAIRQ value in the card.
43 * Basically eliminated everything not relevant to getting the
44 cards minimally functioning on the Macintosh.
46 I might add that these cards are badly designed even from the Mac
47 standpoint, in that Dayna, in their infinite wisdom, used NuBus slot
48 I/O space and NuBus interrupts for these cards, but neglected to
49 provide anything even remotely resembling a NuBus ROM. Therefore we
50 have to probe for them in a brain-damaged ISA-like fashion.
52 Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 11/01/2001
53 check kmalloc and release the allocated memory on failure in
54 mac89x0_probe and in init_module
55 use local_irq_{save,restore}(flags) in net_get_stat, not just
56 local_irq_{dis,en}able()
59 static char *version =
60 "cs89x0.c:v1.02 11/26/96 Russell Nelson <nelson@crynwr.com>\n";
62 /* ======================= configure the driver here ======================= */
64 /* use 0 for production, 1 for verification, >2 for debug */
69 /* ======================= end of configuration ======================= */
72 /* Always include 'config.h' first in case the user wants to turn on
73 or override something. */
74 #include <linux/module.h>
79 Crynwr packet driver epktisa.
81 Crystal Semiconductor data sheets.
85 #include <linux/kernel.h>
86 #include <linux/types.h>
87 #include <linux/fcntl.h>
88 #include <linux/interrupt.h>
89 #include <linux/ioport.h>
91 #include <linux/string.h>
92 #include <linux/nubus.h>
93 #include <linux/errno.h>
94 #include <linux/init.h>
95 #include <linux/netdevice.h>
96 #include <linux/etherdevice.h>
97 #include <linux/skbuff.h>
98 #include <linux/delay.h>
99 #include <linux/bitops.h>
100 #include <linux/gfp.h>
102 #include <asm/system.h>
104 #include <asm/hwtest.h>
105 #include <asm/macints.h>
109 static unsigned int net_debug = NET_DEBUG;
111 /* Information that need to be kept for each board. */
113 int chip_type; /* one of: CS8900, CS8920, CS8920M */
114 char chip_revision; /* revision letter of the chip ('A'...) */
115 int send_cmd; /* the propercommand used to send a packet. */
118 int send_underrun; /* keep track of how many underruns in a row we get */
122 /* Index to functions, as function prototypes. */
125 extern void reset_chip(struct net_device *dev);
127 static int net_open(struct net_device *dev);
128 static int net_send_packet(struct sk_buff *skb, struct net_device *dev);
129 static irqreturn_t net_interrupt(int irq, void *dev_id);
130 static void set_multicast_list(struct net_device *dev);
131 static void net_rx(struct net_device *dev);
132 static int net_close(struct net_device *dev);
133 static struct net_device_stats *net_get_stats(struct net_device *dev);
134 static int set_mac_address(struct net_device *dev, void *addr);
137 /* Example routines you must write ;->. */
138 #define tx_done(dev) 1
140 /* For reading/writing registers ISA-style */
142 readreg_io(struct net_device *dev, int portno)
144 nubus_writew(swab16(portno), dev->base_addr + ADD_PORT);
145 return swab16(nubus_readw(dev->base_addr + DATA_PORT));
149 writereg_io(struct net_device *dev, int portno, int value)
151 nubus_writew(swab16(portno), dev->base_addr + ADD_PORT);
152 nubus_writew(swab16(value), dev->base_addr + DATA_PORT);
155 /* These are for reading/writing registers in shared memory */
157 readreg(struct net_device *dev, int portno)
159 return swab16(nubus_readw(dev->mem_start + portno));
163 writereg(struct net_device *dev, int portno, int value)
165 nubus_writew(swab16(value), dev->mem_start + portno);
168 static const struct net_device_ops mac89x0_netdev_ops = {
169 .ndo_open = net_open,
170 .ndo_stop = net_close,
171 .ndo_start_xmit = net_send_packet,
172 .ndo_get_stats = net_get_stats,
173 .ndo_set_multicast_list = set_multicast_list,
174 .ndo_set_mac_address = set_mac_address,
175 .ndo_validate_addr = eth_validate_addr,
176 .ndo_change_mtu = eth_change_mtu,
179 /* Probe for the CS8900 card in slot E. We won't bother looking
180 anywhere else until we have a really good reason to do so. */
181 struct net_device * __init mac89x0_probe(int unit)
183 struct net_device *dev;
184 static int once_is_enough;
185 struct net_local *lp;
186 static unsigned version_printed;
188 unsigned rev_type = 0;
189 unsigned long ioaddr;
194 return ERR_PTR(-ENODEV);
196 dev = alloc_etherdev(sizeof(struct net_local));
198 return ERR_PTR(-ENOMEM);
201 sprintf(dev->name, "eth%d", unit);
202 netdev_boot_setup_check(dev);
209 /* We might have to parameterize this later */
211 /* Get out now if there's a real NuBus card in slot E */
212 if (nubus_find_slot(slot, NULL) != NULL)
215 /* The pseudo-ISA bits always live at offset 0x300 (gee,
217 ioaddr = (unsigned long)
218 nubus_slot_addr(slot) | (((slot&0xf) << 20) + DEFAULTIOBASE);
223 local_irq_save(flags);
224 card_present = (hwreg_present((void*) ioaddr+4) &&
225 hwreg_present((void*) ioaddr + DATA_PORT));
226 local_irq_restore(flags);
232 nubus_writew(0, ioaddr + ADD_PORT);
233 sig = nubus_readw(ioaddr + DATA_PORT);
234 if (sig != swab16(CHIP_EISA_ID_SIG))
237 /* Initialize the net_device structure. */
238 lp = netdev_priv(dev);
240 /* Fill in the 'dev' fields. */
241 dev->base_addr = ioaddr;
242 dev->mem_start = (unsigned long)
243 nubus_slot_addr(slot) | (((slot&0xf) << 20) + MMIOBASE);
244 dev->mem_end = dev->mem_start + 0x1000;
246 /* Turn on shared memory */
247 writereg_io(dev, PP_BusCTL, MEMORY_ON);
249 /* get the chip type */
250 rev_type = readreg(dev, PRODUCT_ID_ADD);
251 lp->chip_type = rev_type &~ REVISON_BITS;
252 lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';
254 /* Check the chip type and revision in order to set the correct send command
255 CS8920 revision C and CS8900 revision F can use the faster send. */
256 lp->send_cmd = TX_AFTER_381;
257 if (lp->chip_type == CS8900 && lp->chip_revision >= 'F')
258 lp->send_cmd = TX_NOW;
259 if (lp->chip_type != CS8900 && lp->chip_revision >= 'C')
260 lp->send_cmd = TX_NOW;
262 if (net_debug && version_printed++ == 0)
265 printk(KERN_INFO "%s: cs89%c0%s rev %c found at %#8lx",
267 lp->chip_type==CS8900?'0':'2',
268 lp->chip_type==CS8920M?"M":"",
272 /* Try to read the MAC address */
273 if ((readreg(dev, PP_SelfST) & (EEPROM_PRESENT | EEPROM_OK)) == 0) {
274 printk("\nmac89x0: No EEPROM, giving up now.\n");
277 for (i = 0; i < ETH_ALEN; i += 2) {
278 /* Big-endian (why??!) */
279 unsigned short s = readreg(dev, PP_IA + i);
280 dev->dev_addr[i] = s >> 8;
281 dev->dev_addr[i+1] = s & 0xff;
285 dev->irq = SLOT2IRQ(slot);
287 /* print the IRQ and ethernet address. */
289 printk(" IRQ %d ADDR %pM\n", dev->irq, dev->dev_addr);
291 dev->netdev_ops = &mac89x0_netdev_ops;
293 err = register_netdev(dev);
298 nubus_writew(0, dev->base_addr + ADD_PORT);
305 /* This is useful for something, but I don't know what yet. */
306 void __init reset_chip(struct net_device *dev)
308 int reset_start_time;
310 writereg(dev, PP_SelfCTL, readreg(dev, PP_SelfCTL) | POWER_ON_RESET);
313 msleep_interruptible(30);
315 /* Wait until the chip is reset */
316 reset_start_time = jiffies;
317 while( (readreg(dev, PP_SelfST) & INIT_DONE) == 0 && jiffies - reset_start_time < 2)
322 /* Open/initialize the board. This is called (in the current kernel)
323 sometime after booting when the 'ifconfig' program is run.
325 This routine should set everything up anew at each open, even
326 registers that "should" only need to be set once at boot, so that
327 there is non-reboot way to recover if something goes wrong.
330 net_open(struct net_device *dev)
332 struct net_local *lp = netdev_priv(dev);
335 /* Disable the interrupt for now */
336 writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) & ~ENABLE_IRQ);
338 /* Grab the interrupt */
339 if (request_irq(dev->irq, net_interrupt, 0, "cs89x0", dev))
342 /* Set up the IRQ - Apparently magic */
343 if (lp->chip_type == CS8900)
344 writereg(dev, PP_CS8900_ISAINT, 0);
346 writereg(dev, PP_CS8920_ISAINT, 0);
348 /* set the Ethernet address */
349 for (i=0; i < ETH_ALEN/2; i++)
350 writereg(dev, PP_IA+i*2, dev->dev_addr[i*2] | (dev->dev_addr[i*2+1] << 8));
352 /* Turn on both receive and transmit operations */
353 writereg(dev, PP_LineCTL, readreg(dev, PP_LineCTL) | SERIAL_RX_ON | SERIAL_TX_ON);
355 /* Receive only error free packets addressed to this card */
357 writereg(dev, PP_RxCTL, DEF_RX_ACCEPT);
359 lp->curr_rx_cfg = RX_OK_ENBL | RX_CRC_ERROR_ENBL;
361 writereg(dev, PP_RxCFG, lp->curr_rx_cfg);
363 writereg(dev, PP_TxCFG, TX_LOST_CRS_ENBL | TX_SQE_ERROR_ENBL | TX_OK_ENBL |
364 TX_LATE_COL_ENBL | TX_JBR_ENBL | TX_ANY_COL_ENBL | TX_16_COL_ENBL);
366 writereg(dev, PP_BufCFG, READY_FOR_TX_ENBL | RX_MISS_COUNT_OVRFLOW_ENBL |
367 TX_COL_COUNT_OVRFLOW_ENBL | TX_UNDERRUN_ENBL);
369 /* now that we've got our act together, enable everything */
370 writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) | ENABLE_IRQ);
371 netif_start_queue(dev);
376 net_send_packet(struct sk_buff *skb, struct net_device *dev)
378 struct net_local *lp = netdev_priv(dev);
382 printk("%s: sent %d byte packet of type %x\n",
384 (skb->data[ETH_ALEN+ETH_ALEN] << 8)
385 | skb->data[ETH_ALEN+ETH_ALEN+1]);
387 /* keep the upload from being interrupted, since we
388 ask the chip to start transmitting before the
389 whole packet has been completely uploaded. */
390 local_irq_save(flags);
391 netif_stop_queue(dev);
393 /* initiate a transmit sequence */
394 writereg(dev, PP_TxCMD, lp->send_cmd);
395 writereg(dev, PP_TxLength, skb->len);
397 /* Test to see if the chip has allocated memory for the packet */
398 if ((readreg(dev, PP_BusST) & READY_FOR_TX_NOW) == 0) {
399 /* Gasp! It hasn't. But that shouldn't happen since
400 we're waiting for TxOk, so return 1 and requeue this packet. */
401 local_irq_restore(flags);
402 return NETDEV_TX_BUSY;
405 /* Write the contents of the packet */
406 skb_copy_from_linear_data(skb, (void *)(dev->mem_start + PP_TxFrame),
409 local_irq_restore(flags);
415 /* The typical workload of the driver:
416 Handle the network interface interrupts. */
417 static irqreturn_t net_interrupt(int irq, void *dev_id)
419 struct net_device *dev = dev_id;
420 struct net_local *lp;
424 printk ("net_interrupt(): irq %d for unknown device.\n", irq);
428 ioaddr = dev->base_addr;
429 lp = netdev_priv(dev);
431 /* we MUST read all the events out of the ISQ, otherwise we'll never
432 get interrupted again. As a consequence, we can't have any limit
433 on the number of times we loop in the interrupt handler. The
434 hardware guarantees that eventually we'll run out of events. Of
435 course, if you're on a slow machine, and packets are arriving
436 faster than you can read them off, you're screwed. Hasta la
438 while ((status = swab16(nubus_readw(dev->base_addr + ISQ_PORT)))) {
439 if (net_debug > 4)printk("%s: event=%04x\n", dev->name, status);
440 switch(status & ISQ_EVENT_MASK) {
441 case ISQ_RECEIVER_EVENT:
442 /* Got a packet(s). */
445 case ISQ_TRANSMITTER_EVENT:
446 dev->stats.tx_packets++;
447 netif_wake_queue(dev);
448 if ((status & TX_OK) == 0)
449 dev->stats.tx_errors++;
450 if (status & TX_LOST_CRS)
451 dev->stats.tx_carrier_errors++;
452 if (status & TX_SQE_ERROR)
453 dev->stats.tx_heartbeat_errors++;
454 if (status & TX_LATE_COL)
455 dev->stats.tx_window_errors++;
456 if (status & TX_16_COL)
457 dev->stats.tx_aborted_errors++;
459 case ISQ_BUFFER_EVENT:
460 if (status & READY_FOR_TX) {
461 /* we tried to transmit a packet earlier,
462 but inexplicably ran out of buffers.
463 That shouldn't happen since we only ever
464 load one packet. Shrug. Do the right
466 netif_wake_queue(dev);
468 if (status & TX_UNDERRUN) {
469 if (net_debug > 0) printk("%s: transmit underrun\n", dev->name);
471 if (lp->send_underrun == 3) lp->send_cmd = TX_AFTER_381;
472 else if (lp->send_underrun == 6) lp->send_cmd = TX_AFTER_ALL;
475 case ISQ_RX_MISS_EVENT:
476 dev->stats.rx_missed_errors += (status >> 6);
478 case ISQ_TX_COL_EVENT:
479 dev->stats.collisions += (status >> 6);
486 /* We have a good packet(s), get it/them out of the buffers. */
488 net_rx(struct net_device *dev)
493 status = readreg(dev, PP_RxStatus);
494 if ((status & RX_OK) == 0) {
495 dev->stats.rx_errors++;
496 if (status & RX_RUNT)
497 dev->stats.rx_length_errors++;
498 if (status & RX_EXTRA_DATA)
499 dev->stats.rx_length_errors++;
500 if ((status & RX_CRC_ERROR) &&
501 !(status & (RX_EXTRA_DATA|RX_RUNT)))
503 dev->stats.rx_crc_errors++;
504 if (status & RX_DRIBBLE)
505 dev->stats.rx_frame_errors++;
509 length = readreg(dev, PP_RxLength);
510 /* Malloc up new buffer. */
511 skb = alloc_skb(length, GFP_ATOMIC);
513 printk("%s: Memory squeeze, dropping packet.\n", dev->name);
514 dev->stats.rx_dropped++;
517 skb_put(skb, length);
519 skb_copy_to_linear_data(skb, (void *)(dev->mem_start + PP_RxFrame),
522 if (net_debug > 3)printk("%s: received %d byte packet of type %x\n",
524 (skb->data[ETH_ALEN+ETH_ALEN] << 8)
525 | skb->data[ETH_ALEN+ETH_ALEN+1]);
527 skb->protocol=eth_type_trans(skb,dev);
529 dev->stats.rx_packets++;
530 dev->stats.rx_bytes += length;
533 /* The inverse routine to net_open(). */
535 net_close(struct net_device *dev)
538 writereg(dev, PP_RxCFG, 0);
539 writereg(dev, PP_TxCFG, 0);
540 writereg(dev, PP_BufCFG, 0);
541 writereg(dev, PP_BusCTL, 0);
543 netif_stop_queue(dev);
545 free_irq(dev->irq, dev);
547 /* Update the statistics here. */
553 /* Get the current statistics. This may be called with the card open or
555 static struct net_device_stats *
556 net_get_stats(struct net_device *dev)
560 local_irq_save(flags);
561 /* Update the statistics from the device registers. */
562 dev->stats.rx_missed_errors += (readreg(dev, PP_RxMiss) >> 6);
563 dev->stats.collisions += (readreg(dev, PP_TxCol) >> 6);
564 local_irq_restore(flags);
569 static void set_multicast_list(struct net_device *dev)
571 struct net_local *lp = netdev_priv(dev);
573 if(dev->flags&IFF_PROMISC)
575 lp->rx_mode = RX_ALL_ACCEPT;
576 } else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev)) {
577 /* The multicast-accept list is initialized to accept-all, and we
578 rely on higher-level filtering for now. */
579 lp->rx_mode = RX_MULTCAST_ACCEPT;
584 writereg(dev, PP_RxCTL, DEF_RX_ACCEPT | lp->rx_mode);
586 /* in promiscuous mode, we accept errored packets, so we have to enable interrupts on them also */
587 writereg(dev, PP_RxCFG, lp->curr_rx_cfg |
588 (lp->rx_mode == RX_ALL_ACCEPT? (RX_CRC_ERROR_ENBL|RX_RUNT_ENBL|RX_EXTRA_DATA_ENBL) : 0));
592 static int set_mac_address(struct net_device *dev, void *addr)
595 printk("%s: Setting MAC address to ", dev->name);
596 for (i = 0; i < 6; i++)
597 printk(" %2.2x", dev->dev_addr[i] = ((unsigned char *)addr)[i]);
599 /* set the Ethernet address */
600 for (i=0; i < ETH_ALEN/2; i++)
601 writereg(dev, PP_IA+i*2, dev->dev_addr[i*2] | (dev->dev_addr[i*2+1] << 8));
608 static struct net_device *dev_cs89x0;
611 module_param(debug, int, 0);
612 MODULE_PARM_DESC(debug, "CS89[02]0 debug level (0-5)");
613 MODULE_LICENSE("GPL");
619 dev_cs89x0 = mac89x0_probe(-1);
620 if (IS_ERR(dev_cs89x0)) {
621 printk(KERN_WARNING "mac89x0.c: No card found\n");
622 return PTR_ERR(dev_cs89x0);
630 unregister_netdev(dev_cs89x0);
631 nubus_writew(0, dev_cs89x0->base_addr + ADD_PORT);
632 free_netdev(dev_cs89x0);