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1/* 3c574.c: A PCMCIA ethernet driver for the 3com 3c574 "RoadRunner".
2
3 Written 1993-1998 by
4 Donald Becker, becker@scyld.com, (driver core) and
5 David Hinds, dahinds@users.sourceforge.net (from his PC card code).
6 Locking fixes (C) Copyright 2003 Red Hat Inc
7
8 This software may be used and distributed according to the terms of
9 the GNU General Public License, incorporated herein by reference.
10
11 This driver derives from Donald Becker's 3c509 core, which has the
12 following copyright:
13 Copyright 1993 United States Government as represented by the
14 Director, National Security Agency.
15
16
17*/
18
19/*
20 Theory of Operation
21
22I. Board Compatibility
23
24This device driver is designed for the 3Com 3c574 PC card Fast Ethernet
25Adapter.
26
27II. Board-specific settings
28
29None -- PC cards are autoconfigured.
30
31III. Driver operation
32
33The 3c574 uses a Boomerang-style interface, without the bus-master capability.
34See the Boomerang driver and documentation for most details.
35
36IV. Notes and chip documentation.
37
38Two added registers are used to enhance PIO performance, RunnerRdCtrl and
39RunnerWrCtrl. These are 11 bit down-counters that are preloaded with the
40count of word (16 bits) reads or writes the driver is about to do to the Rx
41or Tx FIFO. The chip is then able to hide the internal-PCI-bus to PC-card
42translation latency by buffering the I/O operations with an 8 word FIFO.
43Note: No other chip accesses are permitted when this buffer is used.
44
45A second enhancement is that both attribute and common memory space
460x0800-0x0fff can translated to the PIO FIFO. Thus memory operations (faster
47with *some* PCcard bridges) may be used instead of I/O operations.
48This is enabled by setting the 0x10 bit in the PCMCIA LAN COR.
49
50Some slow PC card bridges work better if they never see a WAIT signal.
51This is configured by setting the 0x20 bit in the PCMCIA LAN COR.
52Only do this after testing that it is reliable and improves performance.
53
54The upper five bits of RunnerRdCtrl are used to window into PCcard
55configuration space registers. Window 0 is the regular Boomerang/Odie
56register set, 1-5 are various PC card control registers, and 16-31 are
57the (reversed!) CIS table.
58
59A final note: writing the InternalConfig register in window 3 with an
60invalid ramWidth is Very Bad.
61
62V. References
63
64http://www.scyld.com/expert/NWay.html
65http://www.national.com/opf/DP/DP83840A.html
66
67Thanks to Terry Murphy of 3Com for providing development information for
68earlier 3Com products.
69
70*/
71
72#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
73
74#include <linux/module.h>
75#include <linux/kernel.h>
76#include <linux/slab.h>
77#include <linux/string.h>
78#include <linux/timer.h>
79#include <linux/interrupt.h>
80#include <linux/in.h>
81#include <linux/delay.h>
82#include <linux/netdevice.h>
83#include <linux/etherdevice.h>
84#include <linux/skbuff.h>
85#include <linux/if_arp.h>
86#include <linux/ioport.h>
87#include <linux/bitops.h>
88#include <linux/mii.h>
89
90#include <pcmcia/cistpl.h>
91#include <pcmcia/cisreg.h>
92#include <pcmcia/ciscode.h>
93#include <pcmcia/ds.h>
94
95#include <linux/uaccess.h>
96#include <asm/io.h>
97
98/*====================================================================*/
99
100/* Module parameters */
101
102MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
103MODULE_DESCRIPTION("3Com 3c574 series PCMCIA ethernet driver");
104MODULE_LICENSE("GPL");
105
106#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0)
107
108/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
109INT_MODULE_PARM(max_interrupt_work, 32);
110
111/* Force full duplex modes? */
112INT_MODULE_PARM(full_duplex, 0);
113
114/* Autodetect link polarity reversal? */
115INT_MODULE_PARM(auto_polarity, 1);
116
117
118/*====================================================================*/
119
120/* Time in jiffies before concluding the transmitter is hung. */
121#define TX_TIMEOUT ((800*HZ)/1000)
122
123/* To minimize the size of the driver source and make the driver more
124 readable not all constants are symbolically defined.
125 You'll need the manual if you want to understand driver details anyway. */
126/* Offsets from base I/O address. */
127#define EL3_DATA 0x00
128#define EL3_CMD 0x0e
129#define EL3_STATUS 0x0e
130
131#define EL3WINDOW(win_num) outw(SelectWindow + (win_num), ioaddr + EL3_CMD)
132
133/* The top five bits written to EL3_CMD are a command, the lower
134 11 bits are the parameter, if applicable. */
135enum el3_cmds {
136 TotalReset = 0<<11, SelectWindow = 1<<11, StartCoax = 2<<11,
137 RxDisable = 3<<11, RxEnable = 4<<11, RxReset = 5<<11, RxDiscard = 8<<11,
138 TxEnable = 9<<11, TxDisable = 10<<11, TxReset = 11<<11,
139 FakeIntr = 12<<11, AckIntr = 13<<11, SetIntrEnb = 14<<11,
140 SetStatusEnb = 15<<11, SetRxFilter = 16<<11, SetRxThreshold = 17<<11,
141 SetTxThreshold = 18<<11, SetTxStart = 19<<11, StatsEnable = 21<<11,
142 StatsDisable = 22<<11, StopCoax = 23<<11,
143};
144
145enum elxl_status {
146 IntLatch = 0x0001, AdapterFailure = 0x0002, TxComplete = 0x0004,
147 TxAvailable = 0x0008, RxComplete = 0x0010, RxEarly = 0x0020,
148 IntReq = 0x0040, StatsFull = 0x0080, CmdBusy = 0x1000 };
149
150/* The SetRxFilter command accepts the following classes: */
151enum RxFilter {
152 RxStation = 1, RxMulticast = 2, RxBroadcast = 4, RxProm = 8
153};
154
155enum Window0 {
156 Wn0EepromCmd = 10, Wn0EepromData = 12, /* EEPROM command/address, data. */
157 IntrStatus=0x0E, /* Valid in all windows. */
158};
159/* These assumes the larger EEPROM. */
160enum Win0_EEPROM_cmds {
161 EEPROM_Read = 0x200, EEPROM_WRITE = 0x100, EEPROM_ERASE = 0x300,
162 EEPROM_EWENB = 0x30, /* Enable erasing/writing for 10 msec. */
163 EEPROM_EWDIS = 0x00, /* Disable EWENB before 10 msec timeout. */
164};
165
166/* Register window 1 offsets, the window used in normal operation.
167 On the "Odie" this window is always mapped at offsets 0x10-0x1f.
168 Except for TxFree, which is overlapped by RunnerWrCtrl. */
169enum Window1 {
170 TX_FIFO = 0x10, RX_FIFO = 0x10, RxErrors = 0x14,
171 RxStatus = 0x18, Timer=0x1A, TxStatus = 0x1B,
172 TxFree = 0x0C, /* Remaining free bytes in Tx buffer. */
173 RunnerRdCtrl = 0x16, RunnerWrCtrl = 0x1c,
174};
175
176enum Window3 { /* Window 3: MAC/config bits. */
177 Wn3_Config=0, Wn3_MAC_Ctrl=6, Wn3_Options=8,
178};
179enum wn3_config {
180 Ram_size = 7,
181 Ram_width = 8,
182 Ram_speed = 0x30,
183 Rom_size = 0xc0,
184 Ram_split_shift = 16,
185 Ram_split = 3 << Ram_split_shift,
186 Xcvr_shift = 20,
187 Xcvr = 7 << Xcvr_shift,
188 Autoselect = 0x1000000,
189};
190
191enum Window4 { /* Window 4: Xcvr/media bits. */
192 Wn4_FIFODiag = 4, Wn4_NetDiag = 6, Wn4_PhysicalMgmt=8, Wn4_Media = 10,
193};
194
195#define MEDIA_TP 0x00C0 /* Enable link beat and jabber for 10baseT. */
196
197struct el3_private {
198 struct pcmcia_device *p_dev;
199 u16 advertising, partner; /* NWay media advertisement */
200 unsigned char phys; /* MII device address */
201 unsigned int autoselect:1, default_media:3; /* Read from the EEPROM/Wn3_Config. */
202 /* for transceiver monitoring */
203 struct timer_list media;
204 unsigned short media_status;
205 unsigned short fast_poll;
206 unsigned long last_irq;
207 spinlock_t window_lock; /* Guards the Window selection */
208};
209
210/* Set iff a MII transceiver on any interface requires mdio preamble.
211 This only set with the original DP83840 on older 3c905 boards, so the extra
212 code size of a per-interface flag is not worthwhile. */
213static char mii_preamble_required = 0;
214
215/* Index of functions. */
216
217static int tc574_config(struct pcmcia_device *link);
218static void tc574_release(struct pcmcia_device *link);
219
220static void mdio_sync(unsigned int ioaddr, int bits);
221static int mdio_read(unsigned int ioaddr, int phy_id, int location);
222static void mdio_write(unsigned int ioaddr, int phy_id, int location,
223 int value);
224static unsigned short read_eeprom(unsigned int ioaddr, int index);
225static void tc574_wait_for_completion(struct net_device *dev, int cmd);
226
227static void tc574_reset(struct net_device *dev);
228static void media_check(struct timer_list *t);
229static int el3_open(struct net_device *dev);
230static netdev_tx_t el3_start_xmit(struct sk_buff *skb,
231 struct net_device *dev);
232static irqreturn_t el3_interrupt(int irq, void *dev_id);
233static void update_stats(struct net_device *dev);
234static struct net_device_stats *el3_get_stats(struct net_device *dev);
235static int el3_rx(struct net_device *dev, int worklimit);
236static int el3_close(struct net_device *dev);
237static void el3_tx_timeout(struct net_device *dev, unsigned int txqueue);
238static int el3_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
239static void set_rx_mode(struct net_device *dev);
240static void set_multicast_list(struct net_device *dev);
241
242static void tc574_detach(struct pcmcia_device *p_dev);
243
244/*
245 tc574_attach() creates an "instance" of the driver, allocating
246 local data structures for one device. The device is registered
247 with Card Services.
248*/
249static const struct net_device_ops el3_netdev_ops = {
250 .ndo_open = el3_open,
251 .ndo_stop = el3_close,
252 .ndo_start_xmit = el3_start_xmit,
253 .ndo_tx_timeout = el3_tx_timeout,
254 .ndo_get_stats = el3_get_stats,
255 .ndo_do_ioctl = el3_ioctl,
256 .ndo_set_rx_mode = set_multicast_list,
257 .ndo_set_mac_address = eth_mac_addr,
258 .ndo_validate_addr = eth_validate_addr,
259};
260
261static int tc574_probe(struct pcmcia_device *link)
262{
263 struct el3_private *lp;
264 struct net_device *dev;
265
266 dev_dbg(&link->dev, "3c574_attach()\n");
267
268 /* Create the PC card device object. */
269 dev = alloc_etherdev(sizeof(struct el3_private));
270 if (!dev)
271 return -ENOMEM;
272 lp = netdev_priv(dev);
273 link->priv = dev;
274 lp->p_dev = link;
275
276 spin_lock_init(&lp->window_lock);
277 link->resource[0]->end = 32;
278 link->resource[0]->flags |= IO_DATA_PATH_WIDTH_16;
279 link->config_flags |= CONF_ENABLE_IRQ;
280 link->config_index = 1;
281
282 dev->netdev_ops = &el3_netdev_ops;
283 dev->watchdog_timeo = TX_TIMEOUT;
284
285 return tc574_config(link);
286}
287
288static void tc574_detach(struct pcmcia_device *link)
289{
290 struct net_device *dev = link->priv;
291
292 dev_dbg(&link->dev, "3c574_detach()\n");
293
294 unregister_netdev(dev);
295
296 tc574_release(link);
297
298 free_netdev(dev);
299} /* tc574_detach */
300
301static const char *ram_split[] = {"5:3", "3:1", "1:1", "3:5"};
302
303static int tc574_config(struct pcmcia_device *link)
304{
305 struct net_device *dev = link->priv;
306 struct el3_private *lp = netdev_priv(dev);
307 int ret, i, j;
308 unsigned int ioaddr;
309 __be16 *phys_addr;
310 char *cardname;
311 __u32 config;
312 u8 *buf;
313 size_t len;
314
315 phys_addr = (__be16 *)dev->dev_addr;
316
317 dev_dbg(&link->dev, "3c574_config()\n");
318
319 link->io_lines = 16;
320
321 for (i = j = 0; j < 0x400; j += 0x20) {
322 link->resource[0]->start = j ^ 0x300;
323 i = pcmcia_request_io(link);
324 if (i == 0)
325 break;
326 }
327 if (i != 0)
328 goto failed;
329
330 ret = pcmcia_request_irq(link, el3_interrupt);
331 if (ret)
332 goto failed;
333
334 ret = pcmcia_enable_device(link);
335 if (ret)
336 goto failed;
337
338 dev->irq = link->irq;
339 dev->base_addr = link->resource[0]->start;
340
341 ioaddr = dev->base_addr;
342
343 /* The 3c574 normally uses an EEPROM for configuration info, including
344 the hardware address. The future products may include a modem chip
345 and put the address in the CIS. */
346
347 len = pcmcia_get_tuple(link, 0x88, &buf);
348 if (buf && len >= 6) {
349 for (i = 0; i < 3; i++)
350 phys_addr[i] = htons(le16_to_cpu(buf[i * 2]));
351 kfree(buf);
352 } else {
353 kfree(buf); /* 0 < len < 6 */
354 EL3WINDOW(0);
355 for (i = 0; i < 3; i++)
356 phys_addr[i] = htons(read_eeprom(ioaddr, i + 10));
357 if (phys_addr[0] == htons(0x6060)) {
358 pr_notice("IO port conflict at 0x%03lx-0x%03lx\n",
359 dev->base_addr, dev->base_addr+15);
360 goto failed;
361 }
362 }
363 if (link->prod_id[1])
364 cardname = link->prod_id[1];
365 else
366 cardname = "3Com 3c574";
367
368 {
369 u_char mcr;
370 outw(2<<11, ioaddr + RunnerRdCtrl);
371 mcr = inb(ioaddr + 2);
372 outw(0<<11, ioaddr + RunnerRdCtrl);
373 pr_info(" ASIC rev %d,", mcr>>3);
374 EL3WINDOW(3);
375 config = inl(ioaddr + Wn3_Config);
376 lp->default_media = (config & Xcvr) >> Xcvr_shift;
377 lp->autoselect = config & Autoselect ? 1 : 0;
378 }
379
380 timer_setup(&lp->media, media_check, 0);
381
382 {
383 int phy;
384
385 /* Roadrunner only: Turn on the MII transceiver */
386 outw(0x8040, ioaddr + Wn3_Options);
387 mdelay(1);
388 outw(0xc040, ioaddr + Wn3_Options);
389 tc574_wait_for_completion(dev, TxReset);
390 tc574_wait_for_completion(dev, RxReset);
391 mdelay(1);
392 outw(0x8040, ioaddr + Wn3_Options);
393
394 EL3WINDOW(4);
395 for (phy = 1; phy <= 32; phy++) {
396 int mii_status;
397 mdio_sync(ioaddr, 32);
398 mii_status = mdio_read(ioaddr, phy & 0x1f, 1);
399 if (mii_status != 0xffff) {
400 lp->phys = phy & 0x1f;
401 dev_dbg(&link->dev, " MII transceiver at "
402 "index %d, status %x.\n",
403 phy, mii_status);
404 if ((mii_status & 0x0040) == 0)
405 mii_preamble_required = 1;
406 break;
407 }
408 }
409 if (phy > 32) {
410 pr_notice(" No MII transceivers found!\n");
411 goto failed;
412 }
413 i = mdio_read(ioaddr, lp->phys, 16) | 0x40;
414 mdio_write(ioaddr, lp->phys, 16, i);
415 lp->advertising = mdio_read(ioaddr, lp->phys, 4);
416 if (full_duplex) {
417 /* Only advertise the FD media types. */
418 lp->advertising &= ~0x02a0;
419 mdio_write(ioaddr, lp->phys, 4, lp->advertising);
420 }
421 }
422
423 SET_NETDEV_DEV(dev, &link->dev);
424
425 if (register_netdev(dev) != 0) {
426 pr_notice("register_netdev() failed\n");
427 goto failed;
428 }
429
430 netdev_info(dev, "%s at io %#3lx, irq %d, hw_addr %pM\n",
431 cardname, dev->base_addr, dev->irq, dev->dev_addr);
432 netdev_info(dev, " %dK FIFO split %s Rx:Tx, %sMII interface.\n",
433 8 << (config & Ram_size),
434 ram_split[(config & Ram_split) >> Ram_split_shift],
435 config & Autoselect ? "autoselect " : "");
436
437 return 0;
438
439failed:
440 tc574_release(link);
441 return -ENODEV;
442
443} /* tc574_config */
444
445static void tc574_release(struct pcmcia_device *link)
446{
447 pcmcia_disable_device(link);
448}
449
450static int tc574_suspend(struct pcmcia_device *link)
451{
452 struct net_device *dev = link->priv;
453
454 if (link->open)
455 netif_device_detach(dev);
456
457 return 0;
458}
459
460static int tc574_resume(struct pcmcia_device *link)
461{
462 struct net_device *dev = link->priv;
463
464 if (link->open) {
465 tc574_reset(dev);
466 netif_device_attach(dev);
467 }
468
469 return 0;
470}
471
472static void dump_status(struct net_device *dev)
473{
474 unsigned int ioaddr = dev->base_addr;
475 EL3WINDOW(1);
476 netdev_info(dev, " irq status %04x, rx status %04x, tx status %02x, tx free %04x\n",
477 inw(ioaddr+EL3_STATUS),
478 inw(ioaddr+RxStatus), inb(ioaddr+TxStatus),
479 inw(ioaddr+TxFree));
480 EL3WINDOW(4);
481 netdev_info(dev, " diagnostics: fifo %04x net %04x ethernet %04x media %04x\n",
482 inw(ioaddr+0x04), inw(ioaddr+0x06),
483 inw(ioaddr+0x08), inw(ioaddr+0x0a));
484 EL3WINDOW(1);
485}
486
487/*
488 Use this for commands that may take time to finish
489*/
490static void tc574_wait_for_completion(struct net_device *dev, int cmd)
491{
492 int i = 1500;
493 outw(cmd, dev->base_addr + EL3_CMD);
494 while (--i > 0)
495 if (!(inw(dev->base_addr + EL3_STATUS) & 0x1000)) break;
496 if (i == 0)
497 netdev_notice(dev, "command 0x%04x did not complete!\n", cmd);
498}
499
500/* Read a word from the EEPROM using the regular EEPROM access register.
501 Assume that we are in register window zero.
502 */
503static unsigned short read_eeprom(unsigned int ioaddr, int index)
504{
505 int timer;
506 outw(EEPROM_Read + index, ioaddr + Wn0EepromCmd);
507 /* Pause for at least 162 usec for the read to take place. */
508 for (timer = 1620; timer >= 0; timer--) {
509 if ((inw(ioaddr + Wn0EepromCmd) & 0x8000) == 0)
510 break;
511 }
512 return inw(ioaddr + Wn0EepromData);
513}
514
515/* MII transceiver control section.
516 Read and write the MII registers using software-generated serial
517 MDIO protocol. See the MII specifications or DP83840A data sheet
518 for details.
519 The maxium data clock rate is 2.5 Mhz. The timing is easily met by the
520 slow PC card interface. */
521
522#define MDIO_SHIFT_CLK 0x01
523#define MDIO_DIR_WRITE 0x04
524#define MDIO_DATA_WRITE0 (0x00 | MDIO_DIR_WRITE)
525#define MDIO_DATA_WRITE1 (0x02 | MDIO_DIR_WRITE)
526#define MDIO_DATA_READ 0x02
527#define MDIO_ENB_IN 0x00
528
529/* Generate the preamble required for initial synchronization and
530 a few older transceivers. */
531static void mdio_sync(unsigned int ioaddr, int bits)
532{
533 unsigned int mdio_addr = ioaddr + Wn4_PhysicalMgmt;
534
535 /* Establish sync by sending at least 32 logic ones. */
536 while (-- bits >= 0) {
537 outw(MDIO_DATA_WRITE1, mdio_addr);
538 outw(MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
539 }
540}
541
542static int mdio_read(unsigned int ioaddr, int phy_id, int location)
543{
544 int i;
545 int read_cmd = (0xf6 << 10) | (phy_id << 5) | location;
546 unsigned int retval = 0;
547 unsigned int mdio_addr = ioaddr + Wn4_PhysicalMgmt;
548
549 if (mii_preamble_required)
550 mdio_sync(ioaddr, 32);
551
552 /* Shift the read command bits out. */
553 for (i = 14; i >= 0; i--) {
554 int dataval = (read_cmd&(1<<i)) ? MDIO_DATA_WRITE1 : MDIO_DATA_WRITE0;
555 outw(dataval, mdio_addr);
556 outw(dataval | MDIO_SHIFT_CLK, mdio_addr);
557 }
558 /* Read the two transition, 16 data, and wire-idle bits. */
559 for (i = 19; i > 0; i--) {
560 outw(MDIO_ENB_IN, mdio_addr);
561 retval = (retval << 1) | ((inw(mdio_addr) & MDIO_DATA_READ) ? 1 : 0);
562 outw(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
563 }
564 return (retval>>1) & 0xffff;
565}
566
567static void mdio_write(unsigned int ioaddr, int phy_id, int location, int value)
568{
569 int write_cmd = 0x50020000 | (phy_id << 23) | (location << 18) | value;
570 unsigned int mdio_addr = ioaddr + Wn4_PhysicalMgmt;
571 int i;
572
573 if (mii_preamble_required)
574 mdio_sync(ioaddr, 32);
575
576 /* Shift the command bits out. */
577 for (i = 31; i >= 0; i--) {
578 int dataval = (write_cmd&(1<<i)) ? MDIO_DATA_WRITE1 : MDIO_DATA_WRITE0;
579 outw(dataval, mdio_addr);
580 outw(dataval | MDIO_SHIFT_CLK, mdio_addr);
581 }
582 /* Leave the interface idle. */
583 for (i = 1; i >= 0; i--) {
584 outw(MDIO_ENB_IN, mdio_addr);
585 outw(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
586 }
587}
588
589/* Reset and restore all of the 3c574 registers. */
590static void tc574_reset(struct net_device *dev)
591{
592 struct el3_private *lp = netdev_priv(dev);
593 int i;
594 unsigned int ioaddr = dev->base_addr;
595 unsigned long flags;
596
597 tc574_wait_for_completion(dev, TotalReset|0x10);
598
599 spin_lock_irqsave(&lp->window_lock, flags);
600 /* Clear any transactions in progress. */
601 outw(0, ioaddr + RunnerWrCtrl);
602 outw(0, ioaddr + RunnerRdCtrl);
603
604 /* Set the station address and mask. */
605 EL3WINDOW(2);
606 for (i = 0; i < 6; i++)
607 outb(dev->dev_addr[i], ioaddr + i);
608 for (; i < 12; i+=2)
609 outw(0, ioaddr + i);
610
611 /* Reset config options */
612 EL3WINDOW(3);
613 outb((dev->mtu > 1500 ? 0x40 : 0), ioaddr + Wn3_MAC_Ctrl);
614 outl((lp->autoselect ? 0x01000000 : 0) | 0x0062001b,
615 ioaddr + Wn3_Config);
616 /* Roadrunner only: Turn on the MII transceiver. */
617 outw(0x8040, ioaddr + Wn3_Options);
618 mdelay(1);
619 outw(0xc040, ioaddr + Wn3_Options);
620 EL3WINDOW(1);
621 spin_unlock_irqrestore(&lp->window_lock, flags);
622
623 tc574_wait_for_completion(dev, TxReset);
624 tc574_wait_for_completion(dev, RxReset);
625 mdelay(1);
626 spin_lock_irqsave(&lp->window_lock, flags);
627 EL3WINDOW(3);
628 outw(0x8040, ioaddr + Wn3_Options);
629
630 /* Switch to the stats window, and clear all stats by reading. */
631 outw(StatsDisable, ioaddr + EL3_CMD);
632 EL3WINDOW(6);
633 for (i = 0; i < 10; i++)
634 inb(ioaddr + i);
635 inw(ioaddr + 10);
636 inw(ioaddr + 12);
637 EL3WINDOW(4);
638 inb(ioaddr + 12);
639 inb(ioaddr + 13);
640
641 /* .. enable any extra statistics bits.. */
642 outw(0x0040, ioaddr + Wn4_NetDiag);
643
644 EL3WINDOW(1);
645 spin_unlock_irqrestore(&lp->window_lock, flags);
646
647 /* .. re-sync MII and re-fill what NWay is advertising. */
648 mdio_sync(ioaddr, 32);
649 mdio_write(ioaddr, lp->phys, 4, lp->advertising);
650 if (!auto_polarity) {
651 /* works for TDK 78Q2120 series MII's */
652 i = mdio_read(ioaddr, lp->phys, 16) | 0x20;
653 mdio_write(ioaddr, lp->phys, 16, i);
654 }
655
656 spin_lock_irqsave(&lp->window_lock, flags);
657 /* Switch to register set 1 for normal use, just for TxFree. */
658 set_rx_mode(dev);
659 spin_unlock_irqrestore(&lp->window_lock, flags);
660 outw(StatsEnable, ioaddr + EL3_CMD); /* Turn on statistics. */
661 outw(RxEnable, ioaddr + EL3_CMD); /* Enable the receiver. */
662 outw(TxEnable, ioaddr + EL3_CMD); /* Enable transmitter. */
663 /* Allow status bits to be seen. */
664 outw(SetStatusEnb | 0xff, ioaddr + EL3_CMD);
665 /* Ack all pending events, and set active indicator mask. */
666 outw(AckIntr | IntLatch | TxAvailable | RxEarly | IntReq,
667 ioaddr + EL3_CMD);
668 outw(SetIntrEnb | IntLatch | TxAvailable | RxComplete | StatsFull
669 | AdapterFailure | RxEarly, ioaddr + EL3_CMD);
670}
671
672static int el3_open(struct net_device *dev)
673{
674 struct el3_private *lp = netdev_priv(dev);
675 struct pcmcia_device *link = lp->p_dev;
676
677 if (!pcmcia_dev_present(link))
678 return -ENODEV;
679
680 link->open++;
681 netif_start_queue(dev);
682
683 tc574_reset(dev);
684 lp->media.expires = jiffies + HZ;
685 add_timer(&lp->media);
686
687 dev_dbg(&link->dev, "%s: opened, status %4.4x.\n",
688 dev->name, inw(dev->base_addr + EL3_STATUS));
689
690 return 0;
691}
692
693static void el3_tx_timeout(struct net_device *dev, unsigned int txqueue)
694{
695 unsigned int ioaddr = dev->base_addr;
696
697 netdev_notice(dev, "Transmit timed out!\n");
698 dump_status(dev);
699 dev->stats.tx_errors++;
700 netif_trans_update(dev); /* prevent tx timeout */
701 /* Issue TX_RESET and TX_START commands. */
702 tc574_wait_for_completion(dev, TxReset);
703 outw(TxEnable, ioaddr + EL3_CMD);
704 netif_wake_queue(dev);
705}
706
707static void pop_tx_status(struct net_device *dev)
708{
709 unsigned int ioaddr = dev->base_addr;
710 int i;
711
712 /* Clear the Tx status stack. */
713 for (i = 32; i > 0; i--) {
714 u_char tx_status = inb(ioaddr + TxStatus);
715 if (!(tx_status & 0x84))
716 break;
717 /* reset transmitter on jabber error or underrun */
718 if (tx_status & 0x30)
719 tc574_wait_for_completion(dev, TxReset);
720 if (tx_status & 0x38) {
721 pr_debug("%s: transmit error: status 0x%02x\n",
722 dev->name, tx_status);
723 outw(TxEnable, ioaddr + EL3_CMD);
724 dev->stats.tx_aborted_errors++;
725 }
726 outb(0x00, ioaddr + TxStatus); /* Pop the status stack. */
727 }
728}
729
730static netdev_tx_t el3_start_xmit(struct sk_buff *skb,
731 struct net_device *dev)
732{
733 unsigned int ioaddr = dev->base_addr;
734 struct el3_private *lp = netdev_priv(dev);
735 unsigned long flags;
736
737 pr_debug("%s: el3_start_xmit(length = %ld) called, "
738 "status %4.4x.\n", dev->name, (long)skb->len,
739 inw(ioaddr + EL3_STATUS));
740
741 spin_lock_irqsave(&lp->window_lock, flags);
742
743 dev->stats.tx_bytes += skb->len;
744
745 /* Put out the doubleword header... */
746 outw(skb->len, ioaddr + TX_FIFO);
747 outw(0, ioaddr + TX_FIFO);
748 /* ... and the packet rounded to a doubleword. */
749 outsl(ioaddr + TX_FIFO, skb->data, (skb->len+3)>>2);
750
751 /* TxFree appears only in Window 1, not offset 0x1c. */
752 if (inw(ioaddr + TxFree) <= 1536) {
753 netif_stop_queue(dev);
754 /* Interrupt us when the FIFO has room for max-sized packet.
755 The threshold is in units of dwords. */
756 outw(SetTxThreshold + (1536>>2), ioaddr + EL3_CMD);
757 }
758
759 pop_tx_status(dev);
760 spin_unlock_irqrestore(&lp->window_lock, flags);
761 dev_kfree_skb(skb);
762 return NETDEV_TX_OK;
763}
764
765/* The EL3 interrupt handler. */
766static irqreturn_t el3_interrupt(int irq, void *dev_id)
767{
768 struct net_device *dev = (struct net_device *) dev_id;
769 struct el3_private *lp = netdev_priv(dev);
770 unsigned int ioaddr;
771 unsigned status;
772 int work_budget = max_interrupt_work;
773 int handled = 0;
774
775 if (!netif_device_present(dev))
776 return IRQ_NONE;
777 ioaddr = dev->base_addr;
778
779 pr_debug("%s: interrupt, status %4.4x.\n",
780 dev->name, inw(ioaddr + EL3_STATUS));
781
782 spin_lock(&lp->window_lock);
783
784 while ((status = inw(ioaddr + EL3_STATUS)) &
785 (IntLatch | RxComplete | RxEarly | StatsFull)) {
786 if (!netif_device_present(dev) ||
787 ((status & 0xe000) != 0x2000)) {
788 pr_debug("%s: Interrupt from dead card\n", dev->name);
789 break;
790 }
791
792 handled = 1;
793
794 if (status & RxComplete)
795 work_budget = el3_rx(dev, work_budget);
796
797 if (status & TxAvailable) {
798 pr_debug(" TX room bit was handled.\n");
799 /* There's room in the FIFO for a full-sized packet. */
800 outw(AckIntr | TxAvailable, ioaddr + EL3_CMD);
801 netif_wake_queue(dev);
802 }
803
804 if (status & TxComplete)
805 pop_tx_status(dev);
806
807 if (status & (AdapterFailure | RxEarly | StatsFull)) {
808 /* Handle all uncommon interrupts. */
809 if (status & StatsFull)
810 update_stats(dev);
811 if (status & RxEarly) {
812 work_budget = el3_rx(dev, work_budget);
813 outw(AckIntr | RxEarly, ioaddr + EL3_CMD);
814 }
815 if (status & AdapterFailure) {
816 u16 fifo_diag;
817 EL3WINDOW(4);
818 fifo_diag = inw(ioaddr + Wn4_FIFODiag);
819 EL3WINDOW(1);
820 netdev_notice(dev, "adapter failure, FIFO diagnostic register %04x\n",
821 fifo_diag);
822 if (fifo_diag & 0x0400) {
823 /* Tx overrun */
824 tc574_wait_for_completion(dev, TxReset);
825 outw(TxEnable, ioaddr + EL3_CMD);
826 }
827 if (fifo_diag & 0x2000) {
828 /* Rx underrun */
829 tc574_wait_for_completion(dev, RxReset);
830 set_rx_mode(dev);
831 outw(RxEnable, ioaddr + EL3_CMD);
832 }
833 outw(AckIntr | AdapterFailure, ioaddr + EL3_CMD);
834 }
835 }
836
837 if (--work_budget < 0) {
838 pr_debug("%s: Too much work in interrupt, "
839 "status %4.4x.\n", dev->name, status);
840 /* Clear all interrupts */
841 outw(AckIntr | 0xFF, ioaddr + EL3_CMD);
842 break;
843 }
844 /* Acknowledge the IRQ. */
845 outw(AckIntr | IntReq | IntLatch, ioaddr + EL3_CMD);
846 }
847
848 pr_debug("%s: exiting interrupt, status %4.4x.\n",
849 dev->name, inw(ioaddr + EL3_STATUS));
850
851 spin_unlock(&lp->window_lock);
852 return IRQ_RETVAL(handled);
853}
854
855/*
856 This timer serves two purposes: to check for missed interrupts
857 (and as a last resort, poll the NIC for events), and to monitor
858 the MII, reporting changes in cable status.
859*/
860static void media_check(struct timer_list *t)
861{
862 struct el3_private *lp = from_timer(lp, t, media);
863 struct net_device *dev = lp->p_dev->priv;
864 unsigned int ioaddr = dev->base_addr;
865 unsigned long flags;
866 unsigned short /* cable, */ media, partner;
867
868 if (!netif_device_present(dev))
869 goto reschedule;
870
871 /* Check for pending interrupt with expired latency timer: with
872 this, we can limp along even if the interrupt is blocked */
873 if ((inw(ioaddr + EL3_STATUS) & IntLatch) && (inb(ioaddr + Timer) == 0xff)) {
874 if (!lp->fast_poll)
875 netdev_info(dev, "interrupt(s) dropped!\n");
876
877 local_irq_save(flags);
878 el3_interrupt(dev->irq, dev);
879 local_irq_restore(flags);
880
881 lp->fast_poll = HZ;
882 }
883 if (lp->fast_poll) {
884 lp->fast_poll--;
885 lp->media.expires = jiffies + 2*HZ/100;
886 add_timer(&lp->media);
887 return;
888 }
889
890 spin_lock_irqsave(&lp->window_lock, flags);
891 EL3WINDOW(4);
892 media = mdio_read(ioaddr, lp->phys, 1);
893 partner = mdio_read(ioaddr, lp->phys, 5);
894 EL3WINDOW(1);
895
896 if (media != lp->media_status) {
897 if ((media ^ lp->media_status) & 0x0004)
898 netdev_info(dev, "%s link beat\n",
899 (lp->media_status & 0x0004) ? "lost" : "found");
900 if ((media ^ lp->media_status) & 0x0020) {
901 lp->partner = 0;
902 if (lp->media_status & 0x0020) {
903 netdev_info(dev, "autonegotiation restarted\n");
904 } else if (partner) {
905 partner &= lp->advertising;
906 lp->partner = partner;
907 netdev_info(dev, "autonegotiation complete: "
908 "%dbaseT-%cD selected\n",
909 (partner & 0x0180) ? 100 : 10,
910 (partner & 0x0140) ? 'F' : 'H');
911 } else {
912 netdev_info(dev, "link partner did not autonegotiate\n");
913 }
914
915 EL3WINDOW(3);
916 outb((partner & 0x0140 ? 0x20 : 0) |
917 (dev->mtu > 1500 ? 0x40 : 0), ioaddr + Wn3_MAC_Ctrl);
918 EL3WINDOW(1);
919
920 }
921 if (media & 0x0010)
922 netdev_info(dev, "remote fault detected\n");
923 if (media & 0x0002)
924 netdev_info(dev, "jabber detected\n");
925 lp->media_status = media;
926 }
927 spin_unlock_irqrestore(&lp->window_lock, flags);
928
929reschedule:
930 lp->media.expires = jiffies + HZ;
931 add_timer(&lp->media);
932}
933
934static struct net_device_stats *el3_get_stats(struct net_device *dev)
935{
936 struct el3_private *lp = netdev_priv(dev);
937
938 if (netif_device_present(dev)) {
939 unsigned long flags;
940 spin_lock_irqsave(&lp->window_lock, flags);
941 update_stats(dev);
942 spin_unlock_irqrestore(&lp->window_lock, flags);
943 }
944 return &dev->stats;
945}
946
947/* Update statistics.
948 Surprisingly this need not be run single-threaded, but it effectively is.
949 The counters clear when read, so the adds must merely be atomic.
950 */
951static void update_stats(struct net_device *dev)
952{
953 unsigned int ioaddr = dev->base_addr;
954 u8 up;
955
956 pr_debug("%s: updating the statistics.\n", dev->name);
957
958 if (inw(ioaddr+EL3_STATUS) == 0xffff) /* No card. */
959 return;
960
961 /* Unlike the 3c509 we need not turn off stats updates while reading. */
962 /* Switch to the stats window, and read everything. */
963 EL3WINDOW(6);
964 dev->stats.tx_carrier_errors += inb(ioaddr + 0);
965 dev->stats.tx_heartbeat_errors += inb(ioaddr + 1);
966 /* Multiple collisions. */ inb(ioaddr + 2);
967 dev->stats.collisions += inb(ioaddr + 3);
968 dev->stats.tx_window_errors += inb(ioaddr + 4);
969 dev->stats.rx_fifo_errors += inb(ioaddr + 5);
970 dev->stats.tx_packets += inb(ioaddr + 6);
971 up = inb(ioaddr + 9);
972 dev->stats.tx_packets += (up&0x30) << 4;
973 /* Rx packets */ inb(ioaddr + 7);
974 /* Tx deferrals */ inb(ioaddr + 8);
975 /* rx */ inw(ioaddr + 10);
976 /* tx */ inw(ioaddr + 12);
977
978 EL3WINDOW(4);
979 /* BadSSD */ inb(ioaddr + 12);
980 up = inb(ioaddr + 13);
981
982 EL3WINDOW(1);
983}
984
985static int el3_rx(struct net_device *dev, int worklimit)
986{
987 unsigned int ioaddr = dev->base_addr;
988 short rx_status;
989
990 pr_debug("%s: in rx_packet(), status %4.4x, rx_status %4.4x.\n",
991 dev->name, inw(ioaddr+EL3_STATUS), inw(ioaddr+RxStatus));
992 while (!((rx_status = inw(ioaddr + RxStatus)) & 0x8000) &&
993 worklimit > 0) {
994 worklimit--;
995 if (rx_status & 0x4000) { /* Error, update stats. */
996 short error = rx_status & 0x3800;
997 dev->stats.rx_errors++;
998 switch (error) {
999 case 0x0000: dev->stats.rx_over_errors++; break;
1000 case 0x0800: dev->stats.rx_length_errors++; break;
1001 case 0x1000: dev->stats.rx_frame_errors++; break;
1002 case 0x1800: dev->stats.rx_length_errors++; break;
1003 case 0x2000: dev->stats.rx_frame_errors++; break;
1004 case 0x2800: dev->stats.rx_crc_errors++; break;
1005 }
1006 } else {
1007 short pkt_len = rx_status & 0x7ff;
1008 struct sk_buff *skb;
1009
1010 skb = netdev_alloc_skb(dev, pkt_len + 5);
1011
1012 pr_debug(" Receiving packet size %d status %4.4x.\n",
1013 pkt_len, rx_status);
1014 if (skb != NULL) {
1015 skb_reserve(skb, 2);
1016 insl(ioaddr+RX_FIFO, skb_put(skb, pkt_len),
1017 ((pkt_len+3)>>2));
1018 skb->protocol = eth_type_trans(skb, dev);
1019 netif_rx(skb);
1020 dev->stats.rx_packets++;
1021 dev->stats.rx_bytes += pkt_len;
1022 } else {
1023 pr_debug("%s: couldn't allocate a sk_buff of"
1024 " size %d.\n", dev->name, pkt_len);
1025 dev->stats.rx_dropped++;
1026 }
1027 }
1028 tc574_wait_for_completion(dev, RxDiscard);
1029 }
1030
1031 return worklimit;
1032}
1033
1034/* Provide ioctl() calls to examine the MII xcvr state. */
1035static int el3_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1036{
1037 struct el3_private *lp = netdev_priv(dev);
1038 unsigned int ioaddr = dev->base_addr;
1039 struct mii_ioctl_data *data = if_mii(rq);
1040 int phy = lp->phys & 0x1f;
1041
1042 pr_debug("%s: In ioct(%-.6s, %#4.4x) %4.4x %4.4x %4.4x %4.4x.\n",
1043 dev->name, rq->ifr_ifrn.ifrn_name, cmd,
1044 data->phy_id, data->reg_num, data->val_in, data->val_out);
1045
1046 switch(cmd) {
1047 case SIOCGMIIPHY: /* Get the address of the PHY in use. */
1048 data->phy_id = phy;
1049 fallthrough;
1050 case SIOCGMIIREG: /* Read the specified MII register. */
1051 {
1052 int saved_window;
1053 unsigned long flags;
1054
1055 spin_lock_irqsave(&lp->window_lock, flags);
1056 saved_window = inw(ioaddr + EL3_CMD) >> 13;
1057 EL3WINDOW(4);
1058 data->val_out = mdio_read(ioaddr, data->phy_id & 0x1f,
1059 data->reg_num & 0x1f);
1060 EL3WINDOW(saved_window);
1061 spin_unlock_irqrestore(&lp->window_lock, flags);
1062 return 0;
1063 }
1064 case SIOCSMIIREG: /* Write the specified MII register */
1065 {
1066 int saved_window;
1067 unsigned long flags;
1068
1069 spin_lock_irqsave(&lp->window_lock, flags);
1070 saved_window = inw(ioaddr + EL3_CMD) >> 13;
1071 EL3WINDOW(4);
1072 mdio_write(ioaddr, data->phy_id & 0x1f,
1073 data->reg_num & 0x1f, data->val_in);
1074 EL3WINDOW(saved_window);
1075 spin_unlock_irqrestore(&lp->window_lock, flags);
1076 return 0;
1077 }
1078 default:
1079 return -EOPNOTSUPP;
1080 }
1081}
1082
1083/* The Odie chip has a 64 bin multicast filter, but the bit layout is not
1084 documented. Until it is we revert to receiving all multicast frames when
1085 any multicast reception is desired.
1086 Note: My other drivers emit a log message whenever promiscuous mode is
1087 entered to help detect password sniffers. This is less desirable on
1088 typical PC card machines, so we omit the message.
1089 */
1090
1091static void set_rx_mode(struct net_device *dev)
1092{
1093 unsigned int ioaddr = dev->base_addr;
1094
1095 if (dev->flags & IFF_PROMISC)
1096 outw(SetRxFilter | RxStation | RxMulticast | RxBroadcast | RxProm,
1097 ioaddr + EL3_CMD);
1098 else if (!netdev_mc_empty(dev) || (dev->flags & IFF_ALLMULTI))
1099 outw(SetRxFilter|RxStation|RxMulticast|RxBroadcast, ioaddr + EL3_CMD);
1100 else
1101 outw(SetRxFilter | RxStation | RxBroadcast, ioaddr + EL3_CMD);
1102}
1103
1104static void set_multicast_list(struct net_device *dev)
1105{
1106 struct el3_private *lp = netdev_priv(dev);
1107 unsigned long flags;
1108
1109 spin_lock_irqsave(&lp->window_lock, flags);
1110 set_rx_mode(dev);
1111 spin_unlock_irqrestore(&lp->window_lock, flags);
1112}
1113
1114static int el3_close(struct net_device *dev)
1115{
1116 unsigned int ioaddr = dev->base_addr;
1117 struct el3_private *lp = netdev_priv(dev);
1118 struct pcmcia_device *link = lp->p_dev;
1119
1120 dev_dbg(&link->dev, "%s: shutting down ethercard.\n", dev->name);
1121
1122 if (pcmcia_dev_present(link)) {
1123 unsigned long flags;
1124
1125 /* Turn off statistics ASAP. We update lp->stats below. */
1126 outw(StatsDisable, ioaddr + EL3_CMD);
1127
1128 /* Disable the receiver and transmitter. */
1129 outw(RxDisable, ioaddr + EL3_CMD);
1130 outw(TxDisable, ioaddr + EL3_CMD);
1131
1132 /* Note: Switching to window 0 may disable the IRQ. */
1133 EL3WINDOW(0);
1134 spin_lock_irqsave(&lp->window_lock, flags);
1135 update_stats(dev);
1136 spin_unlock_irqrestore(&lp->window_lock, flags);
1137
1138 /* force interrupts off */
1139 outw(SetIntrEnb | 0x0000, ioaddr + EL3_CMD);
1140 }
1141
1142 link->open--;
1143 netif_stop_queue(dev);
1144 del_timer_sync(&lp->media);
1145
1146 return 0;
1147}
1148
1149static const struct pcmcia_device_id tc574_ids[] = {
1150 PCMCIA_DEVICE_MANF_CARD(0x0101, 0x0574),
1151 PCMCIA_MFC_DEVICE_CIS_MANF_CARD(0, 0x0101, 0x0556, "cis/3CCFEM556.cis"),
1152 PCMCIA_DEVICE_NULL,
1153};
1154MODULE_DEVICE_TABLE(pcmcia, tc574_ids);
1155
1156static struct pcmcia_driver tc574_driver = {
1157 .owner = THIS_MODULE,
1158 .name = "3c574_cs",
1159 .probe = tc574_probe,
1160 .remove = tc574_detach,
1161 .id_table = tc574_ids,
1162 .suspend = tc574_suspend,
1163 .resume = tc574_resume,
1164};
1165module_pcmcia_driver(tc574_driver);