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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 3c507.c: An EtherLink16 device driver for Linux. */
2/*
3 Written 1993,1994 by Donald Becker.
4
5 Copyright 1993 United States Government as represented by the
6 Director, National Security Agency.
7
8 This software may be used and distributed according to the terms
9 of the GNU General Public License, incorporated herein by reference.
10
11 The author may be reached as becker@scyld.com, or C/O
12 Scyld Computing Corporation
13 410 Severn Ave., Suite 210
14 Annapolis MD 21403
15
16
17 Thanks go to jennings@Montrouge.SMR.slb.com ( Patrick Jennings)
18 and jrs@world.std.com (Rick Sladkey) for testing and bugfixes.
19 Mark Salazar <leslie@access.digex.net> made the changes for cards with
20 only 16K packet buffers.
21
22 Things remaining to do:
23 Verify that the tx and rx buffers don't have fencepost errors.
24 Move the theory of operation and memory map documentation.
25 The statistics need to be updated correctly.
26*/
27
28#define DRV_NAME "3c507"
29#define DRV_VERSION "1.10a"
30#define DRV_RELDATE "11/17/2001"
31
32static const char version[] =
33 DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " Donald Becker (becker@scyld.com)\n";
34
35/*
36 Sources:
37 This driver wouldn't have been written with the availability of the
38 Crynwr driver source code. It provided a known-working implementation
39 that filled in the gaping holes of the Intel documentation. Three cheers
40 for Russ Nelson.
41
42 Intel Microcommunications Databook, Vol. 1, 1990. It provides just enough
43 info that the casual reader might think that it documents the i82586 :-<.
44*/
45
46#include <linux/module.h>
47#include <linux/kernel.h>
48#include <linux/types.h>
49#include <linux/fcntl.h>
50#include <linux/interrupt.h>
51#include <linux/ioport.h>
52#include <linux/in.h>
53#include <linux/string.h>
54#include <linux/spinlock.h>
55#include <linux/ethtool.h>
56#include <linux/errno.h>
57#include <linux/netdevice.h>
58#include <linux/etherdevice.h>
59#include <linux/skbuff.h>
60#include <linux/slab.h>
61#include <linux/init.h>
62#include <linux/bitops.h>
63
64#include <asm/dma.h>
65#include <asm/io.h>
66#include <asm/system.h>
67#include <asm/uaccess.h>
68
69/* use 0 for production, 1 for verification, 2..7 for debug */
70#ifndef NET_DEBUG
71#define NET_DEBUG 1
72#endif
73static unsigned int net_debug = NET_DEBUG;
74#define debug net_debug
75
76
77/*
78 Details of the i82586.
79
80 You'll really need the databook to understand the details of this part,
81 but the outline is that the i82586 has two separate processing units.
82 Both are started from a list of three configuration tables, of which only
83 the last, the System Control Block (SCB), is used after reset-time. The SCB
84 has the following fields:
85 Status word
86 Command word
87 Tx/Command block addr.
88 Rx block addr.
89 The command word accepts the following controls for the Tx and Rx units:
90 */
91
92#define CUC_START 0x0100
93#define CUC_RESUME 0x0200
94#define CUC_SUSPEND 0x0300
95#define RX_START 0x0010
96#define RX_RESUME 0x0020
97#define RX_SUSPEND 0x0030
98
99/* The Rx unit uses a list of frame descriptors and a list of data buffer
100 descriptors. We use full-sized (1518 byte) data buffers, so there is
101 a one-to-one pairing of frame descriptors to buffer descriptors.
102
103 The Tx ("command") unit executes a list of commands that look like:
104 Status word Written by the 82586 when the command is done.
105 Command word Command in lower 3 bits, post-command action in upper 3
106 Link word The address of the next command.
107 Parameters (as needed).
108
109 Some definitions related to the Command Word are:
110 */
111#define CMD_EOL 0x8000 /* The last command of the list, stop. */
112#define CMD_SUSP 0x4000 /* Suspend after doing cmd. */
113#define CMD_INTR 0x2000 /* Interrupt after doing cmd. */
114
115enum commands {
116 CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
117 CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7};
118
119/* Information that need to be kept for each board. */
120struct net_local {
121 struct net_device_stats stats;
122 int last_restart;
123 ushort rx_head;
124 ushort rx_tail;
125 ushort tx_head;
126 ushort tx_cmd_link;
127 ushort tx_reap;
128 ushort tx_pkts_in_ring;
129 spinlock_t lock;
130 void __iomem *base;
131};
132
133/*
134 Details of the EtherLink16 Implementation
135 The 3c507 is a generic shared-memory i82586 implementation.
136 The host can map 16K, 32K, 48K, or 64K of the 64K memory into
137 0x0[CD][08]0000, or all 64K into 0xF[02468]0000.
138 */
139
140/* Offsets from the base I/O address. */
141#define SA_DATA 0 /* Station address data, or 3Com signature. */
142#define MISC_CTRL 6 /* Switch the SA_DATA banks, and bus config bits. */
143#define RESET_IRQ 10 /* Reset the latched IRQ line. */
144#define SIGNAL_CA 11 /* Frob the 82586 Channel Attention line. */
145#define ROM_CONFIG 13
146#define MEM_CONFIG 14
147#define IRQ_CONFIG 15
148#define EL16_IO_EXTENT 16
149
150/* The ID port is used at boot-time to locate the ethercard. */
151#define ID_PORT 0x100
152
153/* Offsets to registers in the mailbox (SCB). */
154#define iSCB_STATUS 0x8
155#define iSCB_CMD 0xA
156#define iSCB_CBL 0xC /* Command BLock offset. */
157#define iSCB_RFA 0xE /* Rx Frame Area offset. */
158
159/* Since the 3c507 maps the shared memory window so that the last byte is
160 at 82586 address FFFF, the first byte is at 82586 address 0, 16K, 32K, or
161 48K corresponding to window sizes of 64K, 48K, 32K and 16K respectively.
162 We can account for this be setting the 'SBC Base' entry in the ISCP table
163 below for all the 16 bit offset addresses, and also adding the 'SCB Base'
164 value to all 24 bit physical addresses (in the SCP table and the TX and RX
165 Buffer Descriptors).
166 -Mark
167 */
168#define SCB_BASE ((unsigned)64*1024 - (dev->mem_end - dev->mem_start))
169
170/*
171 What follows in 'init_words[]' is the "program" that is downloaded to the
172 82586 memory. It's mostly tables and command blocks, and starts at the
173 reset address 0xfffff6. This is designed to be similar to the EtherExpress,
174 thus the unusual location of the SCB at 0x0008.
175
176 Even with the additional "don't care" values, doing it this way takes less
177 program space than initializing the individual tables, and I feel it's much
178 cleaner.
179
180 The databook is particularly useless for the first two structures, I had
181 to use the Crynwr driver as an example.
182
183 The memory setup is as follows:
184 */
185
186#define CONFIG_CMD 0x0018
187#define SET_SA_CMD 0x0024
188#define SA_OFFSET 0x002A
189#define IDLELOOP 0x30
190#define TDR_CMD 0x38
191#define TDR_TIME 0x3C
192#define DUMP_CMD 0x40
193#define DIAG_CMD 0x48
194#define SET_MC_CMD 0x4E
195#define DUMP_DATA 0x56 /* A 170 byte buffer for dump and Set-MC into. */
196
197#define TX_BUF_START 0x0100
198#define NUM_TX_BUFS 5
199#define TX_BUF_SIZE (1518+14+20+16) /* packet+header+TBD */
200
201#define RX_BUF_START 0x2000
202#define RX_BUF_SIZE (1518+14+18) /* packet+header+RBD */
203#define RX_BUF_END (dev->mem_end - dev->mem_start)
204
205#define TX_TIMEOUT 5
206
207/*
208 That's it: only 86 bytes to set up the beast, including every extra
209 command available. The 170 byte buffer at DUMP_DATA is shared between the
210 Dump command (called only by the diagnostic program) and the SetMulticastList
211 command.
212
213 To complete the memory setup you only have to write the station address at
214 SA_OFFSET and create the Tx & Rx buffer lists.
215
216 The Tx command chain and buffer list is setup as follows:
217 A Tx command table, with the data buffer pointing to...
218 A Tx data buffer descriptor. The packet is in a single buffer, rather than
219 chaining together several smaller buffers.
220 A NoOp command, which initially points to itself,
221 And the packet data.
222
223 A transmit is done by filling in the Tx command table and data buffer,
224 re-writing the NoOp command, and finally changing the offset of the last
225 command to point to the current Tx command. When the Tx command is finished,
226 it jumps to the NoOp, when it loops until the next Tx command changes the
227 "link offset" in the NoOp. This way the 82586 never has to go through the
228 slow restart sequence.
229
230 The Rx buffer list is set up in the obvious ring structure. We have enough
231 memory (and low enough interrupt latency) that we can avoid the complicated
232 Rx buffer linked lists by alway associating a full-size Rx data buffer with
233 each Rx data frame.
234
235 I current use four transmit buffers starting at TX_BUF_START (0x0100), and
236 use the rest of memory, from RX_BUF_START to RX_BUF_END, for Rx buffers.
237
238 */
239
240static unsigned short init_words[] = {
241 /* System Configuration Pointer (SCP). */
242 0x0000, /* Set bus size to 16 bits. */
243 0,0, /* pad words. */
244 0x0000,0x0000, /* ISCP phys addr, set in init_82586_mem(). */
245
246 /* Intermediate System Configuration Pointer (ISCP). */
247 0x0001, /* Status word that's cleared when init is done. */
248 0x0008,0,0, /* SCB offset, (skip, skip) */
249
250 /* System Control Block (SCB). */
251 0,0xf000|RX_START|CUC_START, /* SCB status and cmd. */
252 CONFIG_CMD, /* Command list pointer, points to Configure. */
253 RX_BUF_START, /* Rx block list. */
254 0,0,0,0, /* Error count: CRC, align, buffer, overrun. */
255
256 /* 0x0018: Configure command. Change to put MAC data with packet. */
257 0, CmdConfigure, /* Status, command. */
258 SET_SA_CMD, /* Next command is Set Station Addr. */
259 0x0804, /* "4" bytes of config data, 8 byte FIFO. */
260 0x2e40, /* Magic values, including MAC data location. */
261 0, /* Unused pad word. */
262
263 /* 0x0024: Setup station address command. */
264 0, CmdSASetup,
265 SET_MC_CMD, /* Next command. */
266 0xaa00,0xb000,0x0bad, /* Station address (to be filled in) */
267
268 /* 0x0030: NOP, looping back to itself. Point to first Tx buffer to Tx. */
269 0, CmdNOp, IDLELOOP, 0 /* pad */,
270
271 /* 0x0038: A unused Time-Domain Reflectometer command. */
272 0, CmdTDR, IDLELOOP, 0,
273
274 /* 0x0040: An unused Dump State command. */
275 0, CmdDump, IDLELOOP, DUMP_DATA,
276
277 /* 0x0048: An unused Diagnose command. */
278 0, CmdDiagnose, IDLELOOP,
279
280 /* 0x004E: An empty set-multicast-list command. */
281 0, CmdMulticastList, IDLELOOP, 0,
282};
283
284/* Index to functions, as function prototypes. */
285
286static int el16_probe1(struct net_device *dev, int ioaddr);
287static int el16_open(struct net_device *dev);
288static int el16_send_packet(struct sk_buff *skb, struct net_device *dev);
David Howells7d12e782006-10-05 14:55:46 +0100289static irqreturn_t el16_interrupt(int irq, void *dev_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290static void el16_rx(struct net_device *dev);
291static int el16_close(struct net_device *dev);
292static struct net_device_stats *el16_get_stats(struct net_device *dev);
293static void el16_tx_timeout (struct net_device *dev);
294
295static void hardware_send_packet(struct net_device *dev, void *buf, short length, short pad);
296static void init_82586_mem(struct net_device *dev);
Jeff Garzik7282d492006-09-13 14:30:00 -0400297static const struct ethtool_ops netdev_ethtool_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298static void init_rx_bufs(struct net_device *);
299
300static int io = 0x300;
301static int irq;
302static int mem_start;
303
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400304
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305/* Check for a network adaptor of this type, and return '0' iff one exists.
306 If dev->base_addr == 0, probe all likely locations.
307 If dev->base_addr == 1, always return failure.
308 If dev->base_addr == 2, (detachable devices only) allocate space for the
309 device and return success.
310 */
311
312struct net_device * __init el16_probe(int unit)
313{
314 struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
315 static unsigned ports[] = { 0x300, 0x320, 0x340, 0x280, 0};
316 unsigned *port;
317 int err = -ENODEV;
318
319 if (!dev)
320 return ERR_PTR(-ENODEV);
321
322 if (unit >= 0) {
323 sprintf(dev->name, "eth%d", unit);
324 netdev_boot_setup_check(dev);
325 io = dev->base_addr;
326 irq = dev->irq;
327 mem_start = dev->mem_start & 15;
328 }
329
330 SET_MODULE_OWNER(dev);
331
332 if (io > 0x1ff) /* Check a single specified location. */
333 err = el16_probe1(dev, io);
334 else if (io != 0)
335 err = -ENXIO; /* Don't probe at all. */
336 else {
337 for (port = ports; *port; port++) {
338 err = el16_probe1(dev, *port);
339 if (!err)
340 break;
341 }
342 }
343
344 if (err)
345 goto out;
346 err = register_netdev(dev);
347 if (err)
348 goto out1;
349 return dev;
350out1:
351 free_irq(dev->irq, dev);
352 iounmap(((struct net_local *)netdev_priv(dev))->base);
353 release_region(dev->base_addr, EL16_IO_EXTENT);
354out:
355 free_netdev(dev);
356 return ERR_PTR(err);
357}
358
359static int __init el16_probe1(struct net_device *dev, int ioaddr)
360{
361 static unsigned char init_ID_done, version_printed;
362 int i, irq, irqval, retval;
363 struct net_local *lp;
364
365 if (init_ID_done == 0) {
366 ushort lrs_state = 0xff;
367 /* Send the ID sequence to the ID_PORT to enable the board(s). */
368 outb(0x00, ID_PORT);
369 for(i = 0; i < 255; i++) {
370 outb(lrs_state, ID_PORT);
371 lrs_state <<= 1;
372 if (lrs_state & 0x100)
373 lrs_state ^= 0xe7;
374 }
375 outb(0x00, ID_PORT);
376 init_ID_done = 1;
377 }
378
379 if (!request_region(ioaddr, EL16_IO_EXTENT, DRV_NAME))
380 return -ENODEV;
381
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400382 if ((inb(ioaddr) != '*') || (inb(ioaddr + 1) != '3') ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 (inb(ioaddr + 2) != 'C') || (inb(ioaddr + 3) != 'O')) {
384 retval = -ENODEV;
385 goto out;
386 }
387
388 if (net_debug && version_printed++ == 0)
389 printk(version);
390
391 printk("%s: 3c507 at %#x,", dev->name, ioaddr);
392
393 /* We should make a few more checks here, like the first three octets of
394 the S.A. for the manufacturer's code. */
395
396 irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
397
398 irqval = request_irq(irq, &el16_interrupt, 0, DRV_NAME, dev);
399 if (irqval) {
400 printk(KERN_ERR "3c507: unable to get IRQ %d (irqval=%d).\n", irq, irqval);
401 retval = -EAGAIN;
402 goto out;
403 }
404
405 /* We've committed to using the board, and can start filling in *dev. */
406 dev->base_addr = ioaddr;
407
408 outb(0x01, ioaddr + MISC_CTRL);
409 for (i = 0; i < 6; i++) {
410 dev->dev_addr[i] = inb(ioaddr + i);
411 printk(" %02x", dev->dev_addr[i]);
412 }
413
414 if (mem_start)
415 net_debug = mem_start & 7;
416
417#ifdef MEM_BASE
418 dev->mem_start = MEM_BASE;
419 dev->mem_end = dev->mem_start + 0x10000;
420#else
421 {
422 int base;
423 int size;
424 char mem_config = inb(ioaddr + MEM_CONFIG);
425 if (mem_config & 0x20) {
426 size = 64*1024;
427 base = 0xf00000 + (mem_config & 0x08 ? 0x080000
428 : ((mem_config & 3) << 17));
429 } else {
430 size = ((mem_config & 3) + 1) << 14;
431 base = 0x0c0000 + ( (mem_config & 0x18) << 12);
432 }
433 dev->mem_start = base;
434 dev->mem_end = base + size;
435 }
436#endif
437
438 dev->if_port = (inb(ioaddr + ROM_CONFIG) & 0x80) ? 1 : 0;
439 dev->irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
440
441 printk(", IRQ %d, %sternal xcvr, memory %#lx-%#lx.\n", dev->irq,
442 dev->if_port ? "ex" : "in", dev->mem_start, dev->mem_end-1);
443
444 if (net_debug)
445 printk(version);
446
447 lp = netdev_priv(dev);
448 memset(lp, 0, sizeof(*lp));
449 spin_lock_init(&lp->lock);
450 lp->base = ioremap(dev->mem_start, RX_BUF_END);
451 if (!lp->base) {
452 printk(KERN_ERR "3c507: unable to remap memory\n");
453 retval = -EAGAIN;
454 goto out1;
455 }
456
457 dev->open = el16_open;
458 dev->stop = el16_close;
459 dev->hard_start_xmit = el16_send_packet;
460 dev->get_stats = el16_get_stats;
461 dev->tx_timeout = el16_tx_timeout;
462 dev->watchdog_timeo = TX_TIMEOUT;
463 dev->ethtool_ops = &netdev_ethtool_ops;
464 dev->flags &= ~IFF_MULTICAST; /* Multicast doesn't work */
465 return 0;
466out1:
467 free_irq(dev->irq, dev);
468out:
469 release_region(ioaddr, EL16_IO_EXTENT);
470 return retval;
471}
472
473static int el16_open(struct net_device *dev)
474{
475 /* Initialize the 82586 memory and start it. */
476 init_82586_mem(dev);
477
478 netif_start_queue(dev);
479 return 0;
480}
481
482
483static void el16_tx_timeout (struct net_device *dev)
484{
485 struct net_local *lp = netdev_priv(dev);
486 int ioaddr = dev->base_addr;
487 void __iomem *shmem = lp->base;
488
489 if (net_debug > 1)
490 printk ("%s: transmit timed out, %s? ", dev->name,
491 readw(shmem + iSCB_STATUS) & 0x8000 ? "IRQ conflict" :
492 "network cable problem");
493 /* Try to restart the adaptor. */
494 if (lp->last_restart == lp->stats.tx_packets) {
495 if (net_debug > 1)
496 printk ("Resetting board.\n");
497 /* Completely reset the adaptor. */
498 init_82586_mem (dev);
499 lp->tx_pkts_in_ring = 0;
500 } else {
501 /* Issue the channel attention signal and hope it "gets better". */
502 if (net_debug > 1)
503 printk ("Kicking board.\n");
504 writew(0xf000 | CUC_START | RX_START, shmem + iSCB_CMD);
505 outb (0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
506 lp->last_restart = lp->stats.tx_packets;
507 }
508 dev->trans_start = jiffies;
509 netif_wake_queue (dev);
510}
511
512
513static int el16_send_packet (struct sk_buff *skb, struct net_device *dev)
514{
515 struct net_local *lp = netdev_priv(dev);
516 int ioaddr = dev->base_addr;
517 unsigned long flags;
518 short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
519 unsigned char *buf = skb->data;
520
521 netif_stop_queue (dev);
522
523 spin_lock_irqsave (&lp->lock, flags);
524
525 lp->stats.tx_bytes += length;
526 /* Disable the 82586's input to the interrupt line. */
527 outb (0x80, ioaddr + MISC_CTRL);
528
529 hardware_send_packet (dev, buf, skb->len, length - skb->len);
530
531 dev->trans_start = jiffies;
532 /* Enable the 82586 interrupt input. */
533 outb (0x84, ioaddr + MISC_CTRL);
534
535 spin_unlock_irqrestore (&lp->lock, flags);
536
537 dev_kfree_skb (skb);
538
539 /* You might need to clean up and record Tx statistics here. */
540
541 return 0;
542}
543
544/* The typical workload of the driver:
545 Handle the network interface interrupts. */
David Howells7d12e782006-10-05 14:55:46 +0100546static irqreturn_t el16_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547{
548 struct net_device *dev = dev_id;
549 struct net_local *lp;
550 int ioaddr, status, boguscount = 0;
551 ushort ack_cmd = 0;
552 void __iomem *shmem;
553
554 if (dev == NULL) {
555 printk ("net_interrupt(): irq %d for unknown device.\n", irq);
556 return IRQ_NONE;
557 }
558
559 ioaddr = dev->base_addr;
560 lp = netdev_priv(dev);
561 shmem = lp->base;
562
563 spin_lock(&lp->lock);
564
565 status = readw(shmem+iSCB_STATUS);
566
567 if (net_debug > 4) {
568 printk("%s: 3c507 interrupt, status %4.4x.\n", dev->name, status);
569 }
570
571 /* Disable the 82586's input to the interrupt line. */
572 outb(0x80, ioaddr + MISC_CTRL);
573
574 /* Reap the Tx packet buffers. */
575 while (lp->tx_pkts_in_ring) {
576 unsigned short tx_status = readw(shmem+lp->tx_reap);
577 if (!(tx_status & 0x8000)) {
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400578 if (net_debug > 5)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 printk("Tx command incomplete (%#x).\n", lp->tx_reap);
580 break;
581 }
582 /* Tx unsuccessful or some interesting status bit set. */
583 if (!(tx_status & 0x2000) || (tx_status & 0x0f3f)) {
584 lp->stats.tx_errors++;
585 if (tx_status & 0x0600) lp->stats.tx_carrier_errors++;
586 if (tx_status & 0x0100) lp->stats.tx_fifo_errors++;
587 if (!(tx_status & 0x0040)) lp->stats.tx_heartbeat_errors++;
588 if (tx_status & 0x0020) lp->stats.tx_aborted_errors++;
589 lp->stats.collisions += tx_status & 0xf;
590 }
591 lp->stats.tx_packets++;
592 if (net_debug > 5)
593 printk("Reaped %x, Tx status %04x.\n" , lp->tx_reap, tx_status);
594 lp->tx_reap += TX_BUF_SIZE;
595 if (lp->tx_reap > RX_BUF_START - TX_BUF_SIZE)
596 lp->tx_reap = TX_BUF_START;
597
598 lp->tx_pkts_in_ring--;
599 /* There is always more space in the Tx ring buffer now. */
600 netif_wake_queue(dev);
601
602 if (++boguscount > 10)
603 break;
604 }
605
606 if (status & 0x4000) { /* Packet received. */
607 if (net_debug > 5)
608 printk("Received packet, rx_head %04x.\n", lp->rx_head);
609 el16_rx(dev);
610 }
611
612 /* Acknowledge the interrupt sources. */
613 ack_cmd = status & 0xf000;
614
615 if ((status & 0x0700) != 0x0200 && netif_running(dev)) {
616 if (net_debug)
617 printk("%s: Command unit stopped, status %04x, restarting.\n",
618 dev->name, status);
619 /* If this ever occurs we should really re-write the idle loop, reset
620 the Tx list, and do a complete restart of the command unit.
621 For now we rely on the Tx timeout if the resume doesn't work. */
622 ack_cmd |= CUC_RESUME;
623 }
624
625 if ((status & 0x0070) != 0x0040 && netif_running(dev)) {
626 /* The Rx unit is not ready, it must be hung. Restart the receiver by
627 initializing the rx buffers, and issuing an Rx start command. */
628 if (net_debug)
629 printk("%s: Rx unit stopped, status %04x, restarting.\n",
630 dev->name, status);
631 init_rx_bufs(dev);
632 writew(RX_BUF_START,shmem+iSCB_RFA);
633 ack_cmd |= RX_START;
634 }
635
636 writew(ack_cmd,shmem+iSCB_CMD);
637 outb(0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
638
639 /* Clear the latched interrupt. */
640 outb(0, ioaddr + RESET_IRQ);
641
642 /* Enable the 82586's interrupt input. */
643 outb(0x84, ioaddr + MISC_CTRL);
644 spin_unlock(&lp->lock);
645 return IRQ_HANDLED;
646}
647
648static int el16_close(struct net_device *dev)
649{
650 struct net_local *lp = netdev_priv(dev);
651 int ioaddr = dev->base_addr;
652 void __iomem *shmem = lp->base;
653
654 netif_stop_queue(dev);
655
656 /* Flush the Tx and disable Rx. */
657 writew(RX_SUSPEND | CUC_SUSPEND,shmem+iSCB_CMD);
658 outb(0, ioaddr + SIGNAL_CA);
659
660 /* Disable the 82586's input to the interrupt line. */
661 outb(0x80, ioaddr + MISC_CTRL);
662
663 /* We always physically use the IRQ line, so we don't do free_irq(). */
664
665 /* Update the statistics here. */
666
667 return 0;
668}
669
670/* Get the current statistics. This may be called with the card open or
671 closed. */
672static struct net_device_stats *el16_get_stats(struct net_device *dev)
673{
674 struct net_local *lp = netdev_priv(dev);
675
676 /* ToDo: decide if there are any useful statistics from the SCB. */
677
678 return &lp->stats;
679}
680
681/* Initialize the Rx-block list. */
682static void init_rx_bufs(struct net_device *dev)
683{
684 struct net_local *lp = netdev_priv(dev);
685 void __iomem *write_ptr;
686 unsigned short SCB_base = SCB_BASE;
687
688 int cur_rxbuf = lp->rx_head = RX_BUF_START;
689
690 /* Initialize each Rx frame + data buffer. */
691 do { /* While there is room for one more. */
692
693 write_ptr = lp->base + cur_rxbuf;
694
695 writew(0x0000,write_ptr); /* Status */
696 writew(0x0000,write_ptr+=2); /* Command */
697 writew(cur_rxbuf + RX_BUF_SIZE,write_ptr+=2); /* Link */
698 writew(cur_rxbuf + 22,write_ptr+=2); /* Buffer offset */
699 writew(0x0000,write_ptr+=2); /* Pad for dest addr. */
700 writew(0x0000,write_ptr+=2);
701 writew(0x0000,write_ptr+=2);
702 writew(0x0000,write_ptr+=2); /* Pad for source addr. */
703 writew(0x0000,write_ptr+=2);
704 writew(0x0000,write_ptr+=2);
705 writew(0x0000,write_ptr+=2); /* Pad for protocol. */
706
707 writew(0x0000,write_ptr+=2); /* Buffer: Actual count */
708 writew(-1,write_ptr+=2); /* Buffer: Next (none). */
709 writew(cur_rxbuf + 0x20 + SCB_base,write_ptr+=2);/* Buffer: Address low */
710 writew(0x0000,write_ptr+=2);
711 /* Finally, the number of bytes in the buffer. */
712 writew(0x8000 + RX_BUF_SIZE-0x20,write_ptr+=2);
713
714 lp->rx_tail = cur_rxbuf;
715 cur_rxbuf += RX_BUF_SIZE;
716 } while (cur_rxbuf <= RX_BUF_END - RX_BUF_SIZE);
717
718 /* Terminate the list by setting the EOL bit, and wrap the pointer to make
719 the list a ring. */
720 write_ptr = lp->base + lp->rx_tail + 2;
721 writew(0xC000,write_ptr); /* Command, mark as last. */
722 writew(lp->rx_head,write_ptr+2); /* Link */
723}
724
725static void init_82586_mem(struct net_device *dev)
726{
727 struct net_local *lp = netdev_priv(dev);
728 short ioaddr = dev->base_addr;
729 void __iomem *shmem = lp->base;
730
731 /* Enable loopback to protect the wire while starting up,
732 and hold the 586 in reset during the memory initialization. */
733 outb(0x20, ioaddr + MISC_CTRL);
734
735 /* Fix the ISCP address and base. */
736 init_words[3] = SCB_BASE;
737 init_words[7] = SCB_BASE;
738
739 /* Write the words at 0xfff6 (address-aliased to 0xfffff6). */
740 memcpy_toio(lp->base + RX_BUF_END - 10, init_words, 10);
741
742 /* Write the words at 0x0000. */
743 memcpy_toio(lp->base, init_words + 5, sizeof(init_words) - 10);
744
745 /* Fill in the station address. */
746 memcpy_toio(lp->base+SA_OFFSET, dev->dev_addr,
747 sizeof(dev->dev_addr));
748
749 /* The Tx-block list is written as needed. We just set up the values. */
750 lp->tx_cmd_link = IDLELOOP + 4;
751 lp->tx_head = lp->tx_reap = TX_BUF_START;
752
753 init_rx_bufs(dev);
754
755 /* Start the 586 by releasing the reset line, but leave loopback. */
756 outb(0xA0, ioaddr + MISC_CTRL);
757
758 /* This was time consuming to track down: you need to give two channel
759 attention signals to reliably start up the i82586. */
760 outb(0, ioaddr + SIGNAL_CA);
761
762 {
763 int boguscnt = 50;
764 while (readw(shmem+iSCB_STATUS) == 0)
765 if (--boguscnt == 0) {
766 printk("%s: i82586 initialization timed out with status %04x,"
767 "cmd %04x.\n", dev->name,
768 readw(shmem+iSCB_STATUS), readw(shmem+iSCB_CMD));
769 break;
770 }
771 /* Issue channel-attn -- the 82586 won't start. */
772 outb(0, ioaddr + SIGNAL_CA);
773 }
774
775 /* Disable loopback and enable interrupts. */
776 outb(0x84, ioaddr + MISC_CTRL);
777 if (net_debug > 4)
778 printk("%s: Initialized 82586, status %04x.\n", dev->name,
779 readw(shmem+iSCB_STATUS));
780 return;
781}
782
783static void hardware_send_packet(struct net_device *dev, void *buf, short length, short pad)
784{
785 struct net_local *lp = netdev_priv(dev);
786 short ioaddr = dev->base_addr;
787 ushort tx_block = lp->tx_head;
788 void __iomem *write_ptr = lp->base + tx_block;
789 static char padding[ETH_ZLEN];
790
791 /* Set the write pointer to the Tx block, and put out the header. */
792 writew(0x0000,write_ptr); /* Tx status */
793 writew(CMD_INTR|CmdTx,write_ptr+=2); /* Tx command */
794 writew(tx_block+16,write_ptr+=2); /* Next command is a NoOp. */
795 writew(tx_block+8,write_ptr+=2); /* Data Buffer offset. */
796
797 /* Output the data buffer descriptor. */
798 writew((pad + length) | 0x8000,write_ptr+=2); /* Byte count parameter. */
799 writew(-1,write_ptr+=2); /* No next data buffer. */
800 writew(tx_block+22+SCB_BASE,write_ptr+=2); /* Buffer follows the NoOp command. */
801 writew(0x0000,write_ptr+=2); /* Buffer address high bits (always zero). */
802
803 /* Output the Loop-back NoOp command. */
804 writew(0x0000,write_ptr+=2); /* Tx status */
805 writew(CmdNOp,write_ptr+=2); /* Tx command */
806 writew(tx_block+16,write_ptr+=2); /* Next is myself. */
807
808 /* Output the packet at the write pointer. */
809 memcpy_toio(write_ptr+2, buf, length);
810 if (pad)
811 memcpy_toio(write_ptr+length+2, padding, pad);
812
813 /* Set the old command link pointing to this send packet. */
814 writew(tx_block,lp->base + lp->tx_cmd_link);
815 lp->tx_cmd_link = tx_block + 20;
816
817 /* Set the next free tx region. */
818 lp->tx_head = tx_block + TX_BUF_SIZE;
819 if (lp->tx_head > RX_BUF_START - TX_BUF_SIZE)
820 lp->tx_head = TX_BUF_START;
821
822 if (net_debug > 4) {
823 printk("%s: 3c507 @%x send length = %d, tx_block %3x, next %3x.\n",
824 dev->name, ioaddr, length, tx_block, lp->tx_head);
825 }
826
827 /* Grimly block further packets if there has been insufficient reaping. */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400828 if (++lp->tx_pkts_in_ring < NUM_TX_BUFS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 netif_wake_queue(dev);
830}
831
832static void el16_rx(struct net_device *dev)
833{
834 struct net_local *lp = netdev_priv(dev);
835 void __iomem *shmem = lp->base;
836 ushort rx_head = lp->rx_head;
837 ushort rx_tail = lp->rx_tail;
838 ushort boguscount = 10;
839 short frame_status;
840
841 while ((frame_status = readw(shmem+rx_head)) < 0) { /* Command complete */
842 void __iomem *read_frame = lp->base + rx_head;
843 ushort rfd_cmd = readw(read_frame+2);
844 ushort next_rx_frame = readw(read_frame+4);
845 ushort data_buffer_addr = readw(read_frame+6);
846 void __iomem *data_frame = lp->base + data_buffer_addr;
847 ushort pkt_len = readw(data_frame);
848
849 if (rfd_cmd != 0 || data_buffer_addr != rx_head + 22
850 || (pkt_len & 0xC000) != 0xC000) {
851 printk("%s: Rx frame at %#x corrupted, status %04x cmd %04x"
852 "next %04x data-buf @%04x %04x.\n", dev->name, rx_head,
853 frame_status, rfd_cmd, next_rx_frame, data_buffer_addr,
854 pkt_len);
855 } else if ((frame_status & 0x2000) == 0) {
856 /* Frame Rxed, but with error. */
857 lp->stats.rx_errors++;
858 if (frame_status & 0x0800) lp->stats.rx_crc_errors++;
859 if (frame_status & 0x0400) lp->stats.rx_frame_errors++;
860 if (frame_status & 0x0200) lp->stats.rx_fifo_errors++;
861 if (frame_status & 0x0100) lp->stats.rx_over_errors++;
862 if (frame_status & 0x0080) lp->stats.rx_length_errors++;
863 } else {
864 /* Malloc up new buffer. */
865 struct sk_buff *skb;
866
867 pkt_len &= 0x3fff;
868 skb = dev_alloc_skb(pkt_len+2);
869 if (skb == NULL) {
870 printk("%s: Memory squeeze, dropping packet.\n", dev->name);
871 lp->stats.rx_dropped++;
872 break;
873 }
874
875 skb_reserve(skb,2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876
877 /* 'skb->data' points to the start of sk_buff data area. */
878 memcpy_fromio(skb_put(skb,pkt_len), data_frame + 10, pkt_len);
879
880 skb->protocol=eth_type_trans(skb,dev);
881 netif_rx(skb);
882 dev->last_rx = jiffies;
883 lp->stats.rx_packets++;
884 lp->stats.rx_bytes += pkt_len;
885 }
886
887 /* Clear the status word and set End-of-List on the rx frame. */
888 writew(0,read_frame);
889 writew(0xC000,read_frame+2);
890 /* Clear the end-of-list on the prev. RFD. */
891 writew(0x0000,lp->base + rx_tail + 2);
892
893 rx_tail = rx_head;
894 rx_head = next_rx_frame;
895 if (--boguscount == 0)
896 break;
897 }
898
899 lp->rx_head = rx_head;
900 lp->rx_tail = rx_tail;
901}
902
903static void netdev_get_drvinfo(struct net_device *dev,
904 struct ethtool_drvinfo *info)
905{
906 strcpy(info->driver, DRV_NAME);
907 strcpy(info->version, DRV_VERSION);
908 sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
909}
910
911static u32 netdev_get_msglevel(struct net_device *dev)
912{
913 return debug;
914}
915
916static void netdev_set_msglevel(struct net_device *dev, u32 level)
917{
918 debug = level;
919}
920
Jeff Garzik7282d492006-09-13 14:30:00 -0400921static const struct ethtool_ops netdev_ethtool_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 .get_drvinfo = netdev_get_drvinfo,
923 .get_msglevel = netdev_get_msglevel,
924 .set_msglevel = netdev_set_msglevel,
925};
926
927#ifdef MODULE
928static struct net_device *dev_3c507;
929module_param(io, int, 0);
930module_param(irq, int, 0);
931MODULE_PARM_DESC(io, "EtherLink16 I/O base address");
932MODULE_PARM_DESC(irq, "(ignored)");
933
Randy Dunlap96e672c2006-06-10 13:33:48 -0700934int __init init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935{
936 if (io == 0)
937 printk("3c507: You should not use auto-probing with insmod!\n");
938 dev_3c507 = el16_probe(-1);
939 return IS_ERR(dev_3c507) ? PTR_ERR(dev_3c507) : 0;
940}
941
Al Viroafc8eb42006-06-14 18:50:53 -0400942void __exit
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943cleanup_module(void)
944{
945 struct net_device *dev = dev_3c507;
946 unregister_netdev(dev);
947 free_irq(dev->irq, dev);
948 iounmap(((struct net_local *)netdev_priv(dev))->base);
949 release_region(dev->base_addr, EL16_IO_EXTENT);
950 free_netdev(dev);
951}
952#endif /* MODULE */
953MODULE_LICENSE("GPL");
954
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400955
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956/*
957 * Local variables:
958 * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -I/usr/src/linux/drivers/net -Wall -Wstrict-prototypes -O6 -m486 -c 3c507.c"
959 * version-control: t
960 * kept-new-versions: 5
961 * tab-width: 4
962 * c-indent-level: 4
963 * End:
964 */