blob: 964d31ac9449a2b90e1bc5921e774468d4e23a1c [file] [log] [blame]
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 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 int last_restart;
122 ushort rx_head;
123 ushort rx_tail;
124 ushort tx_head;
125 ushort tx_cmd_link;
126 ushort tx_reap;
127 ushort tx_pkts_in_ring;
128 spinlock_t lock;
129 void __iomem *base;
130};
131
132/*
133 Details of the EtherLink16 Implementation
134 The 3c507 is a generic shared-memory i82586 implementation.
135 The host can map 16K, 32K, 48K, or 64K of the 64K memory into
136 0x0[CD][08]0000, or all 64K into 0xF[02468]0000.
137 */
138
139/* Offsets from the base I/O address. */
140#define SA_DATA 0 /* Station address data, or 3Com signature. */
141#define MISC_CTRL 6 /* Switch the SA_DATA banks, and bus config bits. */
142#define RESET_IRQ 10 /* Reset the latched IRQ line. */
143#define SIGNAL_CA 11 /* Frob the 82586 Channel Attention line. */
144#define ROM_CONFIG 13
145#define MEM_CONFIG 14
146#define IRQ_CONFIG 15
147#define EL16_IO_EXTENT 16
148
149/* The ID port is used at boot-time to locate the ethercard. */
150#define ID_PORT 0x100
151
152/* Offsets to registers in the mailbox (SCB). */
153#define iSCB_STATUS 0x8
154#define iSCB_CMD 0xA
155#define iSCB_CBL 0xC /* Command BLock offset. */
156#define iSCB_RFA 0xE /* Rx Frame Area offset. */
157
158/* Since the 3c507 maps the shared memory window so that the last byte is
159 at 82586 address FFFF, the first byte is at 82586 address 0, 16K, 32K, or
160 48K corresponding to window sizes of 64K, 48K, 32K and 16K respectively.
161 We can account for this be setting the 'SBC Base' entry in the ISCP table
162 below for all the 16 bit offset addresses, and also adding the 'SCB Base'
163 value to all 24 bit physical addresses (in the SCP table and the TX and RX
164 Buffer Descriptors).
165 -Mark
166 */
167#define SCB_BASE ((unsigned)64*1024 - (dev->mem_end - dev->mem_start))
168
169/*
170 What follows in 'init_words[]' is the "program" that is downloaded to the
171 82586 memory. It's mostly tables and command blocks, and starts at the
172 reset address 0xfffff6. This is designed to be similar to the EtherExpress,
173 thus the unusual location of the SCB at 0x0008.
174
175 Even with the additional "don't care" values, doing it this way takes less
176 program space than initializing the individual tables, and I feel it's much
177 cleaner.
178
179 The databook is particularly useless for the first two structures, I had
180 to use the Crynwr driver as an example.
181
182 The memory setup is as follows:
183 */
184
185#define CONFIG_CMD 0x0018
186#define SET_SA_CMD 0x0024
187#define SA_OFFSET 0x002A
188#define IDLELOOP 0x30
189#define TDR_CMD 0x38
190#define TDR_TIME 0x3C
191#define DUMP_CMD 0x40
192#define DIAG_CMD 0x48
193#define SET_MC_CMD 0x4E
194#define DUMP_DATA 0x56 /* A 170 byte buffer for dump and Set-MC into. */
195
196#define TX_BUF_START 0x0100
197#define NUM_TX_BUFS 5
198#define TX_BUF_SIZE (1518+14+20+16) /* packet+header+TBD */
199
200#define RX_BUF_START 0x2000
201#define RX_BUF_SIZE (1518+14+18) /* packet+header+RBD */
202#define RX_BUF_END (dev->mem_end - dev->mem_start)
203
204#define TX_TIMEOUT 5
205
206/*
207 That's it: only 86 bytes to set up the beast, including every extra
208 command available. The 170 byte buffer at DUMP_DATA is shared between the
209 Dump command (called only by the diagnostic program) and the SetMulticastList
210 command.
211
212 To complete the memory setup you only have to write the station address at
213 SA_OFFSET and create the Tx & Rx buffer lists.
214
215 The Tx command chain and buffer list is setup as follows:
216 A Tx command table, with the data buffer pointing to...
217 A Tx data buffer descriptor. The packet is in a single buffer, rather than
218 chaining together several smaller buffers.
219 A NoOp command, which initially points to itself,
220 And the packet data.
221
222 A transmit is done by filling in the Tx command table and data buffer,
223 re-writing the NoOp command, and finally changing the offset of the last
224 command to point to the current Tx command. When the Tx command is finished,
225 it jumps to the NoOp, when it loops until the next Tx command changes the
226 "link offset" in the NoOp. This way the 82586 never has to go through the
227 slow restart sequence.
228
229 The Rx buffer list is set up in the obvious ring structure. We have enough
230 memory (and low enough interrupt latency) that we can avoid the complicated
231 Rx buffer linked lists by alway associating a full-size Rx data buffer with
232 each Rx data frame.
233
234 I current use four transmit buffers starting at TX_BUF_START (0x0100), and
235 use the rest of memory, from RX_BUF_START to RX_BUF_END, for Rx buffers.
236
237 */
238
239static unsigned short init_words[] = {
240 /* System Configuration Pointer (SCP). */
241 0x0000, /* Set bus size to 16 bits. */
242 0,0, /* pad words. */
243 0x0000,0x0000, /* ISCP phys addr, set in init_82586_mem(). */
244
245 /* Intermediate System Configuration Pointer (ISCP). */
246 0x0001, /* Status word that's cleared when init is done. */
247 0x0008,0,0, /* SCB offset, (skip, skip) */
248
249 /* System Control Block (SCB). */
250 0,0xf000|RX_START|CUC_START, /* SCB status and cmd. */
251 CONFIG_CMD, /* Command list pointer, points to Configure. */
252 RX_BUF_START, /* Rx block list. */
253 0,0,0,0, /* Error count: CRC, align, buffer, overrun. */
254
255 /* 0x0018: Configure command. Change to put MAC data with packet. */
256 0, CmdConfigure, /* Status, command. */
257 SET_SA_CMD, /* Next command is Set Station Addr. */
258 0x0804, /* "4" bytes of config data, 8 byte FIFO. */
259 0x2e40, /* Magic values, including MAC data location. */
260 0, /* Unused pad word. */
261
262 /* 0x0024: Setup station address command. */
263 0, CmdSASetup,
264 SET_MC_CMD, /* Next command. */
265 0xaa00,0xb000,0x0bad, /* Station address (to be filled in) */
266
267 /* 0x0030: NOP, looping back to itself. Point to first Tx buffer to Tx. */
268 0, CmdNOp, IDLELOOP, 0 /* pad */,
269
270 /* 0x0038: A unused Time-Domain Reflectometer command. */
271 0, CmdTDR, IDLELOOP, 0,
272
273 /* 0x0040: An unused Dump State command. */
274 0, CmdDump, IDLELOOP, DUMP_DATA,
275
276 /* 0x0048: An unused Diagnose command. */
277 0, CmdDiagnose, IDLELOOP,
278
279 /* 0x004E: An empty set-multicast-list command. */
280 0, CmdMulticastList, IDLELOOP, 0,
281};
282
283/* Index to functions, as function prototypes. */
284
285static int el16_probe1(struct net_device *dev, int ioaddr);
286static int el16_open(struct net_device *dev);
287static int el16_send_packet(struct sk_buff *skb, struct net_device *dev);
David Howells7d12e782006-10-05 14:55:46 +0100288static irqreturn_t el16_interrupt(int irq, void *dev_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289static void el16_rx(struct net_device *dev);
290static int el16_close(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291static void el16_tx_timeout (struct net_device *dev);
292
293static void hardware_send_packet(struct net_device *dev, void *buf, short length, short pad);
294static void init_82586_mem(struct net_device *dev);
Jeff Garzik7282d492006-09-13 14:30:00 -0400295static const struct ethtool_ops netdev_ethtool_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296static void init_rx_bufs(struct net_device *);
297
298static int io = 0x300;
299static int irq;
300static int mem_start;
301
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303/* Check for a network adaptor of this type, and return '0' iff one exists.
304 If dev->base_addr == 0, probe all likely locations.
305 If dev->base_addr == 1, always return failure.
306 If dev->base_addr == 2, (detachable devices only) allocate space for the
307 device and return success.
308 */
309
310struct net_device * __init el16_probe(int unit)
311{
312 struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
313 static unsigned ports[] = { 0x300, 0x320, 0x340, 0x280, 0};
314 unsigned *port;
315 int err = -ENODEV;
316
317 if (!dev)
318 return ERR_PTR(-ENODEV);
319
320 if (unit >= 0) {
321 sprintf(dev->name, "eth%d", unit);
322 netdev_boot_setup_check(dev);
323 io = dev->base_addr;
324 irq = dev->irq;
325 mem_start = dev->mem_start & 15;
326 }
327
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 if (io > 0x1ff) /* Check a single specified location. */
329 err = el16_probe1(dev, io);
330 else if (io != 0)
331 err = -ENXIO; /* Don't probe at all. */
332 else {
333 for (port = ports; *port; port++) {
334 err = el16_probe1(dev, *port);
335 if (!err)
336 break;
337 }
338 }
339
340 if (err)
341 goto out;
342 err = register_netdev(dev);
343 if (err)
344 goto out1;
345 return dev;
346out1:
347 free_irq(dev->irq, dev);
348 iounmap(((struct net_local *)netdev_priv(dev))->base);
349 release_region(dev->base_addr, EL16_IO_EXTENT);
350out:
351 free_netdev(dev);
352 return ERR_PTR(err);
353}
354
355static int __init el16_probe1(struct net_device *dev, int ioaddr)
356{
357 static unsigned char init_ID_done, version_printed;
358 int i, irq, irqval, retval;
359 struct net_local *lp;
Joe Perches0795af52007-10-03 17:59:30 -0700360 DECLARE_MAC_BUF(mac);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
362 if (init_ID_done == 0) {
363 ushort lrs_state = 0xff;
364 /* Send the ID sequence to the ID_PORT to enable the board(s). */
365 outb(0x00, ID_PORT);
366 for(i = 0; i < 255; i++) {
367 outb(lrs_state, ID_PORT);
368 lrs_state <<= 1;
369 if (lrs_state & 0x100)
370 lrs_state ^= 0xe7;
371 }
372 outb(0x00, ID_PORT);
373 init_ID_done = 1;
374 }
375
376 if (!request_region(ioaddr, EL16_IO_EXTENT, DRV_NAME))
377 return -ENODEV;
378
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400379 if ((inb(ioaddr) != '*') || (inb(ioaddr + 1) != '3') ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 (inb(ioaddr + 2) != 'C') || (inb(ioaddr + 3) != 'O')) {
381 retval = -ENODEV;
382 goto out;
383 }
384
385 if (net_debug && version_printed++ == 0)
386 printk(version);
387
388 printk("%s: 3c507 at %#x,", dev->name, ioaddr);
389
390 /* We should make a few more checks here, like the first three octets of
391 the S.A. for the manufacturer's code. */
392
393 irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
394
395 irqval = request_irq(irq, &el16_interrupt, 0, DRV_NAME, dev);
396 if (irqval) {
397 printk(KERN_ERR "3c507: unable to get IRQ %d (irqval=%d).\n", irq, irqval);
398 retval = -EAGAIN;
399 goto out;
400 }
401
402 /* We've committed to using the board, and can start filling in *dev. */
403 dev->base_addr = ioaddr;
404
405 outb(0x01, ioaddr + MISC_CTRL);
Joe Perches0795af52007-10-03 17:59:30 -0700406 for (i = 0; i < 6; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 dev->dev_addr[i] = inb(ioaddr + i);
Joe Perches0795af52007-10-03 17:59:30 -0700408 printk(" %s", print_mac(mac, dev->dev_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
410 if (mem_start)
411 net_debug = mem_start & 7;
412
413#ifdef MEM_BASE
414 dev->mem_start = MEM_BASE;
415 dev->mem_end = dev->mem_start + 0x10000;
416#else
417 {
418 int base;
419 int size;
420 char mem_config = inb(ioaddr + MEM_CONFIG);
421 if (mem_config & 0x20) {
422 size = 64*1024;
423 base = 0xf00000 + (mem_config & 0x08 ? 0x080000
424 : ((mem_config & 3) << 17));
425 } else {
426 size = ((mem_config & 3) + 1) << 14;
427 base = 0x0c0000 + ( (mem_config & 0x18) << 12);
428 }
429 dev->mem_start = base;
430 dev->mem_end = base + size;
431 }
432#endif
433
434 dev->if_port = (inb(ioaddr + ROM_CONFIG) & 0x80) ? 1 : 0;
435 dev->irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
436
437 printk(", IRQ %d, %sternal xcvr, memory %#lx-%#lx.\n", dev->irq,
438 dev->if_port ? "ex" : "in", dev->mem_start, dev->mem_end-1);
439
440 if (net_debug)
441 printk(version);
442
443 lp = netdev_priv(dev);
444 memset(lp, 0, sizeof(*lp));
445 spin_lock_init(&lp->lock);
446 lp->base = ioremap(dev->mem_start, RX_BUF_END);
447 if (!lp->base) {
448 printk(KERN_ERR "3c507: unable to remap memory\n");
449 retval = -EAGAIN;
450 goto out1;
451 }
452
453 dev->open = el16_open;
454 dev->stop = el16_close;
455 dev->hard_start_xmit = el16_send_packet;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 dev->tx_timeout = el16_tx_timeout;
457 dev->watchdog_timeo = TX_TIMEOUT;
458 dev->ethtool_ops = &netdev_ethtool_ops;
459 dev->flags &= ~IFF_MULTICAST; /* Multicast doesn't work */
460 return 0;
461out1:
462 free_irq(dev->irq, dev);
463out:
464 release_region(ioaddr, EL16_IO_EXTENT);
465 return retval;
466}
467
468static int el16_open(struct net_device *dev)
469{
470 /* Initialize the 82586 memory and start it. */
471 init_82586_mem(dev);
472
473 netif_start_queue(dev);
474 return 0;
475}
476
477
478static void el16_tx_timeout (struct net_device *dev)
479{
480 struct net_local *lp = netdev_priv(dev);
481 int ioaddr = dev->base_addr;
482 void __iomem *shmem = lp->base;
483
484 if (net_debug > 1)
485 printk ("%s: transmit timed out, %s? ", dev->name,
486 readw(shmem + iSCB_STATUS) & 0x8000 ? "IRQ conflict" :
487 "network cable problem");
488 /* Try to restart the adaptor. */
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700489 if (lp->last_restart == dev->stats.tx_packets) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 if (net_debug > 1)
491 printk ("Resetting board.\n");
492 /* Completely reset the adaptor. */
493 init_82586_mem (dev);
494 lp->tx_pkts_in_ring = 0;
495 } else {
496 /* Issue the channel attention signal and hope it "gets better". */
497 if (net_debug > 1)
498 printk ("Kicking board.\n");
499 writew(0xf000 | CUC_START | RX_START, shmem + iSCB_CMD);
500 outb (0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700501 lp->last_restart = dev->stats.tx_packets;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 }
503 dev->trans_start = jiffies;
504 netif_wake_queue (dev);
505}
506
507
508static int el16_send_packet (struct sk_buff *skb, struct net_device *dev)
509{
510 struct net_local *lp = netdev_priv(dev);
511 int ioaddr = dev->base_addr;
512 unsigned long flags;
513 short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
514 unsigned char *buf = skb->data;
515
516 netif_stop_queue (dev);
517
518 spin_lock_irqsave (&lp->lock, flags);
519
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700520 dev->stats.tx_bytes += length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 /* Disable the 82586's input to the interrupt line. */
522 outb (0x80, ioaddr + MISC_CTRL);
523
524 hardware_send_packet (dev, buf, skb->len, length - skb->len);
525
526 dev->trans_start = jiffies;
527 /* Enable the 82586 interrupt input. */
528 outb (0x84, ioaddr + MISC_CTRL);
529
530 spin_unlock_irqrestore (&lp->lock, flags);
531
532 dev_kfree_skb (skb);
533
534 /* You might need to clean up and record Tx statistics here. */
535
536 return 0;
537}
538
539/* The typical workload of the driver:
540 Handle the network interface interrupts. */
David Howells7d12e782006-10-05 14:55:46 +0100541static irqreturn_t el16_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542{
543 struct net_device *dev = dev_id;
544 struct net_local *lp;
545 int ioaddr, status, boguscount = 0;
546 ushort ack_cmd = 0;
547 void __iomem *shmem;
548
549 if (dev == NULL) {
550 printk ("net_interrupt(): irq %d for unknown device.\n", irq);
551 return IRQ_NONE;
552 }
553
554 ioaddr = dev->base_addr;
555 lp = netdev_priv(dev);
556 shmem = lp->base;
557
558 spin_lock(&lp->lock);
559
560 status = readw(shmem+iSCB_STATUS);
561
562 if (net_debug > 4) {
563 printk("%s: 3c507 interrupt, status %4.4x.\n", dev->name, status);
564 }
565
566 /* Disable the 82586's input to the interrupt line. */
567 outb(0x80, ioaddr + MISC_CTRL);
568
569 /* Reap the Tx packet buffers. */
570 while (lp->tx_pkts_in_ring) {
571 unsigned short tx_status = readw(shmem+lp->tx_reap);
572 if (!(tx_status & 0x8000)) {
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400573 if (net_debug > 5)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 printk("Tx command incomplete (%#x).\n", lp->tx_reap);
575 break;
576 }
577 /* Tx unsuccessful or some interesting status bit set. */
578 if (!(tx_status & 0x2000) || (tx_status & 0x0f3f)) {
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700579 dev->stats.tx_errors++;
580 if (tx_status & 0x0600) dev->stats.tx_carrier_errors++;
581 if (tx_status & 0x0100) dev->stats.tx_fifo_errors++;
582 if (!(tx_status & 0x0040)) dev->stats.tx_heartbeat_errors++;
583 if (tx_status & 0x0020) dev->stats.tx_aborted_errors++;
584 dev->stats.collisions += tx_status & 0xf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 }
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700586 dev->stats.tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 if (net_debug > 5)
588 printk("Reaped %x, Tx status %04x.\n" , lp->tx_reap, tx_status);
589 lp->tx_reap += TX_BUF_SIZE;
590 if (lp->tx_reap > RX_BUF_START - TX_BUF_SIZE)
591 lp->tx_reap = TX_BUF_START;
592
593 lp->tx_pkts_in_ring--;
594 /* There is always more space in the Tx ring buffer now. */
595 netif_wake_queue(dev);
596
597 if (++boguscount > 10)
598 break;
599 }
600
601 if (status & 0x4000) { /* Packet received. */
602 if (net_debug > 5)
603 printk("Received packet, rx_head %04x.\n", lp->rx_head);
604 el16_rx(dev);
605 }
606
607 /* Acknowledge the interrupt sources. */
608 ack_cmd = status & 0xf000;
609
610 if ((status & 0x0700) != 0x0200 && netif_running(dev)) {
611 if (net_debug)
612 printk("%s: Command unit stopped, status %04x, restarting.\n",
613 dev->name, status);
614 /* If this ever occurs we should really re-write the idle loop, reset
615 the Tx list, and do a complete restart of the command unit.
616 For now we rely on the Tx timeout if the resume doesn't work. */
617 ack_cmd |= CUC_RESUME;
618 }
619
620 if ((status & 0x0070) != 0x0040 && netif_running(dev)) {
621 /* The Rx unit is not ready, it must be hung. Restart the receiver by
622 initializing the rx buffers, and issuing an Rx start command. */
623 if (net_debug)
624 printk("%s: Rx unit stopped, status %04x, restarting.\n",
625 dev->name, status);
626 init_rx_bufs(dev);
627 writew(RX_BUF_START,shmem+iSCB_RFA);
628 ack_cmd |= RX_START;
629 }
630
631 writew(ack_cmd,shmem+iSCB_CMD);
632 outb(0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
633
634 /* Clear the latched interrupt. */
635 outb(0, ioaddr + RESET_IRQ);
636
637 /* Enable the 82586's interrupt input. */
638 outb(0x84, ioaddr + MISC_CTRL);
639 spin_unlock(&lp->lock);
640 return IRQ_HANDLED;
641}
642
643static int el16_close(struct net_device *dev)
644{
645 struct net_local *lp = netdev_priv(dev);
646 int ioaddr = dev->base_addr;
647 void __iomem *shmem = lp->base;
648
649 netif_stop_queue(dev);
650
651 /* Flush the Tx and disable Rx. */
652 writew(RX_SUSPEND | CUC_SUSPEND,shmem+iSCB_CMD);
653 outb(0, ioaddr + SIGNAL_CA);
654
655 /* Disable the 82586's input to the interrupt line. */
656 outb(0x80, ioaddr + MISC_CTRL);
657
658 /* We always physically use the IRQ line, so we don't do free_irq(). */
659
660 /* Update the statistics here. */
661
662 return 0;
663}
664
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665/* Initialize the Rx-block list. */
666static void init_rx_bufs(struct net_device *dev)
667{
668 struct net_local *lp = netdev_priv(dev);
669 void __iomem *write_ptr;
670 unsigned short SCB_base = SCB_BASE;
671
672 int cur_rxbuf = lp->rx_head = RX_BUF_START;
673
674 /* Initialize each Rx frame + data buffer. */
675 do { /* While there is room for one more. */
676
677 write_ptr = lp->base + cur_rxbuf;
678
679 writew(0x0000,write_ptr); /* Status */
680 writew(0x0000,write_ptr+=2); /* Command */
681 writew(cur_rxbuf + RX_BUF_SIZE,write_ptr+=2); /* Link */
682 writew(cur_rxbuf + 22,write_ptr+=2); /* Buffer offset */
683 writew(0x0000,write_ptr+=2); /* Pad for dest addr. */
684 writew(0x0000,write_ptr+=2);
685 writew(0x0000,write_ptr+=2);
686 writew(0x0000,write_ptr+=2); /* Pad for source addr. */
687 writew(0x0000,write_ptr+=2);
688 writew(0x0000,write_ptr+=2);
689 writew(0x0000,write_ptr+=2); /* Pad for protocol. */
690
691 writew(0x0000,write_ptr+=2); /* Buffer: Actual count */
692 writew(-1,write_ptr+=2); /* Buffer: Next (none). */
693 writew(cur_rxbuf + 0x20 + SCB_base,write_ptr+=2);/* Buffer: Address low */
694 writew(0x0000,write_ptr+=2);
695 /* Finally, the number of bytes in the buffer. */
696 writew(0x8000 + RX_BUF_SIZE-0x20,write_ptr+=2);
697
698 lp->rx_tail = cur_rxbuf;
699 cur_rxbuf += RX_BUF_SIZE;
700 } while (cur_rxbuf <= RX_BUF_END - RX_BUF_SIZE);
701
702 /* Terminate the list by setting the EOL bit, and wrap the pointer to make
703 the list a ring. */
704 write_ptr = lp->base + lp->rx_tail + 2;
705 writew(0xC000,write_ptr); /* Command, mark as last. */
706 writew(lp->rx_head,write_ptr+2); /* Link */
707}
708
709static void init_82586_mem(struct net_device *dev)
710{
711 struct net_local *lp = netdev_priv(dev);
712 short ioaddr = dev->base_addr;
713 void __iomem *shmem = lp->base;
714
715 /* Enable loopback to protect the wire while starting up,
716 and hold the 586 in reset during the memory initialization. */
717 outb(0x20, ioaddr + MISC_CTRL);
718
719 /* Fix the ISCP address and base. */
720 init_words[3] = SCB_BASE;
721 init_words[7] = SCB_BASE;
722
723 /* Write the words at 0xfff6 (address-aliased to 0xfffff6). */
724 memcpy_toio(lp->base + RX_BUF_END - 10, init_words, 10);
725
726 /* Write the words at 0x0000. */
727 memcpy_toio(lp->base, init_words + 5, sizeof(init_words) - 10);
728
729 /* Fill in the station address. */
730 memcpy_toio(lp->base+SA_OFFSET, dev->dev_addr,
731 sizeof(dev->dev_addr));
732
733 /* The Tx-block list is written as needed. We just set up the values. */
734 lp->tx_cmd_link = IDLELOOP + 4;
735 lp->tx_head = lp->tx_reap = TX_BUF_START;
736
737 init_rx_bufs(dev);
738
739 /* Start the 586 by releasing the reset line, but leave loopback. */
740 outb(0xA0, ioaddr + MISC_CTRL);
741
742 /* This was time consuming to track down: you need to give two channel
743 attention signals to reliably start up the i82586. */
744 outb(0, ioaddr + SIGNAL_CA);
745
746 {
747 int boguscnt = 50;
748 while (readw(shmem+iSCB_STATUS) == 0)
749 if (--boguscnt == 0) {
750 printk("%s: i82586 initialization timed out with status %04x,"
751 "cmd %04x.\n", dev->name,
752 readw(shmem+iSCB_STATUS), readw(shmem+iSCB_CMD));
753 break;
754 }
755 /* Issue channel-attn -- the 82586 won't start. */
756 outb(0, ioaddr + SIGNAL_CA);
757 }
758
759 /* Disable loopback and enable interrupts. */
760 outb(0x84, ioaddr + MISC_CTRL);
761 if (net_debug > 4)
762 printk("%s: Initialized 82586, status %04x.\n", dev->name,
763 readw(shmem+iSCB_STATUS));
764 return;
765}
766
767static void hardware_send_packet(struct net_device *dev, void *buf, short length, short pad)
768{
769 struct net_local *lp = netdev_priv(dev);
770 short ioaddr = dev->base_addr;
771 ushort tx_block = lp->tx_head;
772 void __iomem *write_ptr = lp->base + tx_block;
773 static char padding[ETH_ZLEN];
774
775 /* Set the write pointer to the Tx block, and put out the header. */
776 writew(0x0000,write_ptr); /* Tx status */
777 writew(CMD_INTR|CmdTx,write_ptr+=2); /* Tx command */
778 writew(tx_block+16,write_ptr+=2); /* Next command is a NoOp. */
779 writew(tx_block+8,write_ptr+=2); /* Data Buffer offset. */
780
781 /* Output the data buffer descriptor. */
782 writew((pad + length) | 0x8000,write_ptr+=2); /* Byte count parameter. */
783 writew(-1,write_ptr+=2); /* No next data buffer. */
784 writew(tx_block+22+SCB_BASE,write_ptr+=2); /* Buffer follows the NoOp command. */
785 writew(0x0000,write_ptr+=2); /* Buffer address high bits (always zero). */
786
787 /* Output the Loop-back NoOp command. */
788 writew(0x0000,write_ptr+=2); /* Tx status */
789 writew(CmdNOp,write_ptr+=2); /* Tx command */
790 writew(tx_block+16,write_ptr+=2); /* Next is myself. */
791
792 /* Output the packet at the write pointer. */
793 memcpy_toio(write_ptr+2, buf, length);
794 if (pad)
795 memcpy_toio(write_ptr+length+2, padding, pad);
796
797 /* Set the old command link pointing to this send packet. */
798 writew(tx_block,lp->base + lp->tx_cmd_link);
799 lp->tx_cmd_link = tx_block + 20;
800
801 /* Set the next free tx region. */
802 lp->tx_head = tx_block + TX_BUF_SIZE;
803 if (lp->tx_head > RX_BUF_START - TX_BUF_SIZE)
804 lp->tx_head = TX_BUF_START;
805
806 if (net_debug > 4) {
807 printk("%s: 3c507 @%x send length = %d, tx_block %3x, next %3x.\n",
808 dev->name, ioaddr, length, tx_block, lp->tx_head);
809 }
810
811 /* Grimly block further packets if there has been insufficient reaping. */
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400812 if (++lp->tx_pkts_in_ring < NUM_TX_BUFS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 netif_wake_queue(dev);
814}
815
816static void el16_rx(struct net_device *dev)
817{
818 struct net_local *lp = netdev_priv(dev);
819 void __iomem *shmem = lp->base;
820 ushort rx_head = lp->rx_head;
821 ushort rx_tail = lp->rx_tail;
822 ushort boguscount = 10;
823 short frame_status;
824
825 while ((frame_status = readw(shmem+rx_head)) < 0) { /* Command complete */
826 void __iomem *read_frame = lp->base + rx_head;
827 ushort rfd_cmd = readw(read_frame+2);
828 ushort next_rx_frame = readw(read_frame+4);
829 ushort data_buffer_addr = readw(read_frame+6);
830 void __iomem *data_frame = lp->base + data_buffer_addr;
831 ushort pkt_len = readw(data_frame);
832
833 if (rfd_cmd != 0 || data_buffer_addr != rx_head + 22
834 || (pkt_len & 0xC000) != 0xC000) {
835 printk("%s: Rx frame at %#x corrupted, status %04x cmd %04x"
836 "next %04x data-buf @%04x %04x.\n", dev->name, rx_head,
837 frame_status, rfd_cmd, next_rx_frame, data_buffer_addr,
838 pkt_len);
839 } else if ((frame_status & 0x2000) == 0) {
840 /* Frame Rxed, but with error. */
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700841 dev->stats.rx_errors++;
842 if (frame_status & 0x0800) dev->stats.rx_crc_errors++;
843 if (frame_status & 0x0400) dev->stats.rx_frame_errors++;
844 if (frame_status & 0x0200) dev->stats.rx_fifo_errors++;
845 if (frame_status & 0x0100) dev->stats.rx_over_errors++;
846 if (frame_status & 0x0080) dev->stats.rx_length_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 } else {
848 /* Malloc up new buffer. */
849 struct sk_buff *skb;
850
851 pkt_len &= 0x3fff;
852 skb = dev_alloc_skb(pkt_len+2);
853 if (skb == NULL) {
854 printk("%s: Memory squeeze, dropping packet.\n", dev->name);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700855 dev->stats.rx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 break;
857 }
858
859 skb_reserve(skb,2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
861 /* 'skb->data' points to the start of sk_buff data area. */
862 memcpy_fromio(skb_put(skb,pkt_len), data_frame + 10, pkt_len);
863
864 skb->protocol=eth_type_trans(skb,dev);
865 netif_rx(skb);
866 dev->last_rx = jiffies;
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700867 dev->stats.rx_packets++;
868 dev->stats.rx_bytes += pkt_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 }
870
871 /* Clear the status word and set End-of-List on the rx frame. */
872 writew(0,read_frame);
873 writew(0xC000,read_frame+2);
874 /* Clear the end-of-list on the prev. RFD. */
875 writew(0x0000,lp->base + rx_tail + 2);
876
877 rx_tail = rx_head;
878 rx_head = next_rx_frame;
879 if (--boguscount == 0)
880 break;
881 }
882
883 lp->rx_head = rx_head;
884 lp->rx_tail = rx_tail;
885}
886
887static void netdev_get_drvinfo(struct net_device *dev,
888 struct ethtool_drvinfo *info)
889{
890 strcpy(info->driver, DRV_NAME);
891 strcpy(info->version, DRV_VERSION);
892 sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
893}
894
895static u32 netdev_get_msglevel(struct net_device *dev)
896{
897 return debug;
898}
899
900static void netdev_set_msglevel(struct net_device *dev, u32 level)
901{
902 debug = level;
903}
904
Jeff Garzik7282d492006-09-13 14:30:00 -0400905static const struct ethtool_ops netdev_ethtool_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 .get_drvinfo = netdev_get_drvinfo,
907 .get_msglevel = netdev_get_msglevel,
908 .set_msglevel = netdev_set_msglevel,
909};
910
911#ifdef MODULE
912static struct net_device *dev_3c507;
913module_param(io, int, 0);
914module_param(irq, int, 0);
915MODULE_PARM_DESC(io, "EtherLink16 I/O base address");
916MODULE_PARM_DESC(irq, "(ignored)");
917
Randy Dunlap96e672c2006-06-10 13:33:48 -0700918int __init init_module(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919{
920 if (io == 0)
921 printk("3c507: You should not use auto-probing with insmod!\n");
922 dev_3c507 = el16_probe(-1);
923 return IS_ERR(dev_3c507) ? PTR_ERR(dev_3c507) : 0;
924}
925
Al Viroafc8eb42006-06-14 18:50:53 -0400926void __exit
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927cleanup_module(void)
928{
929 struct net_device *dev = dev_3c507;
930 unregister_netdev(dev);
931 free_irq(dev->irq, dev);
932 iounmap(((struct net_local *)netdev_priv(dev))->base);
933 release_region(dev->base_addr, EL16_IO_EXTENT);
934 free_netdev(dev);
935}
936#endif /* MODULE */
937MODULE_LICENSE("GPL");
938
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400939
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940/*
941 * Local variables:
942 * 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"
943 * version-control: t
944 * kept-new-versions: 5
945 * tab-width: 4
946 * c-indent-level: 4
947 * End:
948 */