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
22 I. Board Compatibility
23
24 This device driver is designed for the 3Com 3c574 PC card Fast Ethernet
25 Adapter.
26
27 II. Board-specific settings
28
29 None -- PC cards are autoconfigured.
30
31 III. Driver operation
32
33 The 3c574 uses a Boomerang-style interface, without the bus-master capability.
34 See the Boomerang driver and documentation for most details.
35
36 IV. Notes and chip documentation.
37
38 Two added registers are used to enhance PIO performance, RunnerRdCtrl and
39 RunnerWrCtrl. These are 11 bit down-counters that are preloaded with the
40 count of word (16 bits) reads or writes the driver is about to do to the Rx
41 or Tx FIFO. The chip is then able to hide the internal-PCI-bus to PC-card
42 translation latency by buffering the I/O operations with an 8 word FIFO.
43 Note: No other chip accesses are permitted when this buffer is used.
44
45 A second enhancement is that both attribute and common memory space
46 0x0800-0x0fff can translated to the PIO FIFO. Thus memory operations (faster
47 with *some* PCcard bridges) may be used instead of I/O operations.
48 This is enabled by setting the 0x10 bit in the PCMCIA LAN COR.
49
50 Some slow PC card bridges work better if they never see a WAIT signal.
51 This is configured by setting the 0x20 bit in the PCMCIA LAN COR.
52 Only do this after testing that it is reliable and improves performance.
53
54 The upper five bits of RunnerRdCtrl are used to window into PCcard
55 configuration space registers. Window 0 is the regular Boomerang/Odie
56 register set, 1-5 are various PC card control registers, and 16-31 are
57 the (reversed!) CIS table.
58
59 A final note: writing the InternalConfig register in window 3 with an
60 invalid ramWidth is Very Bad.
61
62 V. References
63
64 http://www.scyld.com/expert/NWay.html
65 http://www.national.com/opf/DP/DP83840A.html
66
67 Thanks to Terry Murphy of 3Com for providing development information for
68 earlier 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
102 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
103 MODULE_DESCRIPTION("3Com 3c574 series PCMCIA ethernet driver");
104 MODULE_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. */
109 INT_MODULE_PARM(max_interrupt_work, 32);
110
111 /* Force full duplex modes? */
112 INT_MODULE_PARM(full_duplex, 0);
113
114 /* Autodetect link polarity reversal? */
115 INT_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. */
135 enum 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
145 enum 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: */
151 enum RxFilter {
152 RxStation = 1, RxMulticast = 2, RxBroadcast = 4, RxProm = 8
153 };
154
155 enum Window0 {
156 Wn0EepromCmd = 10, Wn0EepromData = 12, /* EEPROM command/address, data. */
157 IntrStatus=0x0E, /* Valid in all windows. */
158 };
159 /* These assumes the larger EEPROM. */
160 enum 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. */
169 enum 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
176 enum Window3 { /* Window 3: MAC/config bits. */
177 Wn3_Config=0, Wn3_MAC_Ctrl=6, Wn3_Options=8,
178 };
179 enum 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
191 enum 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
197 struct 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. */
213 static char mii_preamble_required = 0;
214
215 /* Index of functions. */
216
217 static int tc574_config(struct pcmcia_device *link);
218 static void tc574_release(struct pcmcia_device *link);
219
220 static void mdio_sync(unsigned int ioaddr, int bits);
221 static int mdio_read(unsigned int ioaddr, int phy_id, int location);
222 static void mdio_write(unsigned int ioaddr, int phy_id, int location,
223 int value);
224 static unsigned short read_eeprom(unsigned int ioaddr, int index);
225 static void tc574_wait_for_completion(struct net_device *dev, int cmd);
226
227 static void tc574_reset(struct net_device *dev);
228 static void media_check(struct timer_list *t);
229 static int el3_open(struct net_device *dev);
230 static netdev_tx_t el3_start_xmit(struct sk_buff *skb,
231 struct net_device *dev);
232 static irqreturn_t el3_interrupt(int irq, void *dev_id);
233 static void update_stats(struct net_device *dev);
234 static struct net_device_stats *el3_get_stats(struct net_device *dev);
235 static int el3_rx(struct net_device *dev, int worklimit);
236 static int el3_close(struct net_device *dev);
237 static void el3_tx_timeout(struct net_device *dev, unsigned int txqueue);
238 static int el3_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
239 static void set_rx_mode(struct net_device *dev);
240 static void set_multicast_list(struct net_device *dev);
241
242 static 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 */
249 static 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_eth_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
tc574_probe(struct pcmcia_device * link)261 static 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
tc574_detach(struct pcmcia_device * link)288 static 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
301 static const char *ram_split[] = {"5:3", "3:1", "1:1", "3:5"};
302
tc574_config(struct pcmcia_device * link)303 static 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 __be16 addr[ETH_ALEN / 2];
309 unsigned int ioaddr;
310 char *cardname;
311 __u32 config;
312 u8 *buf;
313 size_t len;
314
315 dev_dbg(&link->dev, "3c574_config()\n");
316
317 link->io_lines = 16;
318
319 for (i = j = 0; j < 0x400; j += 0x20) {
320 link->resource[0]->start = j ^ 0x300;
321 i = pcmcia_request_io(link);
322 if (i == 0)
323 break;
324 }
325 if (i != 0)
326 goto failed;
327
328 ret = pcmcia_request_irq(link, el3_interrupt);
329 if (ret)
330 goto failed;
331
332 ret = pcmcia_enable_device(link);
333 if (ret)
334 goto failed;
335
336 dev->irq = link->irq;
337 dev->base_addr = link->resource[0]->start;
338
339 ioaddr = dev->base_addr;
340
341 /* The 3c574 normally uses an EEPROM for configuration info, including
342 the hardware address. The future products may include a modem chip
343 and put the address in the CIS. */
344
345 len = pcmcia_get_tuple(link, 0x88, &buf);
346 if (buf && len >= 6) {
347 for (i = 0; i < 3; i++)
348 addr[i] = htons(le16_to_cpu(buf[i * 2]));
349 kfree(buf);
350 } else {
351 kfree(buf); /* 0 < len < 6 */
352 EL3WINDOW(0);
353 for (i = 0; i < 3; i++)
354 addr[i] = htons(read_eeprom(ioaddr, i + 10));
355 if (addr[0] == htons(0x6060)) {
356 pr_notice("IO port conflict at 0x%03lx-0x%03lx\n",
357 dev->base_addr, dev->base_addr+15);
358 goto failed;
359 }
360 }
361 eth_hw_addr_set(dev, (u8 *)addr);
362 if (link->prod_id[1])
363 cardname = link->prod_id[1];
364 else
365 cardname = "3Com 3c574";
366
367 {
368 u_char mcr;
369 outw(2<<11, ioaddr + RunnerRdCtrl);
370 mcr = inb(ioaddr + 2);
371 outw(0<<11, ioaddr + RunnerRdCtrl);
372 pr_info(" ASIC rev %d,", mcr>>3);
373 EL3WINDOW(3);
374 config = inl(ioaddr + Wn3_Config);
375 lp->default_media = (config & Xcvr) >> Xcvr_shift;
376 lp->autoselect = config & Autoselect ? 1 : 0;
377 }
378
379 timer_setup(&lp->media, media_check, 0);
380
381 {
382 int phy;
383
384 /* Roadrunner only: Turn on the MII transceiver */
385 outw(0x8040, ioaddr + Wn3_Options);
386 mdelay(1);
387 outw(0xc040, ioaddr + Wn3_Options);
388 tc574_wait_for_completion(dev, TxReset);
389 tc574_wait_for_completion(dev, RxReset);
390 mdelay(1);
391 outw(0x8040, ioaddr + Wn3_Options);
392
393 EL3WINDOW(4);
394 for (phy = 1; phy <= 32; phy++) {
395 int mii_status;
396 mdio_sync(ioaddr, 32);
397 mii_status = mdio_read(ioaddr, phy & 0x1f, 1);
398 if (mii_status != 0xffff) {
399 lp->phys = phy & 0x1f;
400 dev_dbg(&link->dev, " MII transceiver at "
401 "index %d, status %x.\n",
402 phy, mii_status);
403 if ((mii_status & 0x0040) == 0)
404 mii_preamble_required = 1;
405 break;
406 }
407 }
408 if (phy > 32) {
409 pr_notice(" No MII transceivers found!\n");
410 goto failed;
411 }
412 i = mdio_read(ioaddr, lp->phys, 16) | 0x40;
413 mdio_write(ioaddr, lp->phys, 16, i);
414 lp->advertising = mdio_read(ioaddr, lp->phys, 4);
415 if (full_duplex) {
416 /* Only advertise the FD media types. */
417 lp->advertising &= ~0x02a0;
418 mdio_write(ioaddr, lp->phys, 4, lp->advertising);
419 }
420 }
421
422 SET_NETDEV_DEV(dev, &link->dev);
423
424 if (register_netdev(dev) != 0) {
425 pr_notice("register_netdev() failed\n");
426 goto failed;
427 }
428
429 netdev_info(dev, "%s at io %#3lx, irq %d, hw_addr %pM\n",
430 cardname, dev->base_addr, dev->irq, dev->dev_addr);
431 netdev_info(dev, " %dK FIFO split %s Rx:Tx, %sMII interface.\n",
432 8 << (config & Ram_size),
433 ram_split[(config & Ram_split) >> Ram_split_shift],
434 config & Autoselect ? "autoselect " : "");
435
436 return 0;
437
438 failed:
439 tc574_release(link);
440 return -ENODEV;
441
442 } /* tc574_config */
443
tc574_release(struct pcmcia_device * link)444 static void tc574_release(struct pcmcia_device *link)
445 {
446 pcmcia_disable_device(link);
447 }
448
tc574_suspend(struct pcmcia_device * link)449 static int tc574_suspend(struct pcmcia_device *link)
450 {
451 struct net_device *dev = link->priv;
452
453 if (link->open)
454 netif_device_detach(dev);
455
456 return 0;
457 }
458
tc574_resume(struct pcmcia_device * link)459 static int tc574_resume(struct pcmcia_device *link)
460 {
461 struct net_device *dev = link->priv;
462
463 if (link->open) {
464 tc574_reset(dev);
465 netif_device_attach(dev);
466 }
467
468 return 0;
469 }
470
dump_status(struct net_device * dev)471 static void dump_status(struct net_device *dev)
472 {
473 unsigned int ioaddr = dev->base_addr;
474 EL3WINDOW(1);
475 netdev_info(dev, " irq status %04x, rx status %04x, tx status %02x, tx free %04x\n",
476 inw(ioaddr+EL3_STATUS),
477 inw(ioaddr+RxStatus), inb(ioaddr+TxStatus),
478 inw(ioaddr+TxFree));
479 EL3WINDOW(4);
480 netdev_info(dev, " diagnostics: fifo %04x net %04x ethernet %04x media %04x\n",
481 inw(ioaddr+0x04), inw(ioaddr+0x06),
482 inw(ioaddr+0x08), inw(ioaddr+0x0a));
483 EL3WINDOW(1);
484 }
485
486 /*
487 Use this for commands that may take time to finish
488 */
tc574_wait_for_completion(struct net_device * dev,int cmd)489 static void tc574_wait_for_completion(struct net_device *dev, int cmd)
490 {
491 int i = 1500;
492 outw(cmd, dev->base_addr + EL3_CMD);
493 while (--i > 0)
494 if (!(inw(dev->base_addr + EL3_STATUS) & 0x1000)) break;
495 if (i == 0)
496 netdev_notice(dev, "command 0x%04x did not complete!\n", cmd);
497 }
498
499 /* Read a word from the EEPROM using the regular EEPROM access register.
500 Assume that we are in register window zero.
501 */
read_eeprom(unsigned int ioaddr,int index)502 static unsigned short read_eeprom(unsigned int ioaddr, int index)
503 {
504 int timer;
505 outw(EEPROM_Read + index, ioaddr + Wn0EepromCmd);
506 /* Pause for at least 162 usec for the read to take place. */
507 for (timer = 1620; timer >= 0; timer--) {
508 if ((inw(ioaddr + Wn0EepromCmd) & 0x8000) == 0)
509 break;
510 }
511 return inw(ioaddr + Wn0EepromData);
512 }
513
514 /* MII transceiver control section.
515 Read and write the MII registers using software-generated serial
516 MDIO protocol. See the MII specifications or DP83840A data sheet
517 for details.
518 The maxium data clock rate is 2.5 Mhz. The timing is easily met by the
519 slow PC card interface. */
520
521 #define MDIO_SHIFT_CLK 0x01
522 #define MDIO_DIR_WRITE 0x04
523 #define MDIO_DATA_WRITE0 (0x00 | MDIO_DIR_WRITE)
524 #define MDIO_DATA_WRITE1 (0x02 | MDIO_DIR_WRITE)
525 #define MDIO_DATA_READ 0x02
526 #define MDIO_ENB_IN 0x00
527
528 /* Generate the preamble required for initial synchronization and
529 a few older transceivers. */
mdio_sync(unsigned int ioaddr,int bits)530 static void mdio_sync(unsigned int ioaddr, int bits)
531 {
532 unsigned int mdio_addr = ioaddr + Wn4_PhysicalMgmt;
533
534 /* Establish sync by sending at least 32 logic ones. */
535 while (-- bits >= 0) {
536 outw(MDIO_DATA_WRITE1, mdio_addr);
537 outw(MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
538 }
539 }
540
mdio_read(unsigned int ioaddr,int phy_id,int location)541 static int mdio_read(unsigned int ioaddr, int phy_id, int location)
542 {
543 int i;
544 int read_cmd = (0xf6 << 10) | (phy_id << 5) | location;
545 unsigned int retval = 0;
546 unsigned int mdio_addr = ioaddr + Wn4_PhysicalMgmt;
547
548 if (mii_preamble_required)
549 mdio_sync(ioaddr, 32);
550
551 /* Shift the read command bits out. */
552 for (i = 14; i >= 0; i--) {
553 int dataval = (read_cmd&(1<<i)) ? MDIO_DATA_WRITE1 : MDIO_DATA_WRITE0;
554 outw(dataval, mdio_addr);
555 outw(dataval | MDIO_SHIFT_CLK, mdio_addr);
556 }
557 /* Read the two transition, 16 data, and wire-idle bits. */
558 for (i = 19; i > 0; i--) {
559 outw(MDIO_ENB_IN, mdio_addr);
560 retval = (retval << 1) | ((inw(mdio_addr) & MDIO_DATA_READ) ? 1 : 0);
561 outw(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
562 }
563 return (retval>>1) & 0xffff;
564 }
565
mdio_write(unsigned int ioaddr,int phy_id,int location,int value)566 static void mdio_write(unsigned int ioaddr, int phy_id, int location, int value)
567 {
568 int write_cmd = 0x50020000 | (phy_id << 23) | (location << 18) | value;
569 unsigned int mdio_addr = ioaddr + Wn4_PhysicalMgmt;
570 int i;
571
572 if (mii_preamble_required)
573 mdio_sync(ioaddr, 32);
574
575 /* Shift the command bits out. */
576 for (i = 31; i >= 0; i--) {
577 int dataval = (write_cmd&(1<<i)) ? MDIO_DATA_WRITE1 : MDIO_DATA_WRITE0;
578 outw(dataval, mdio_addr);
579 outw(dataval | MDIO_SHIFT_CLK, mdio_addr);
580 }
581 /* Leave the interface idle. */
582 for (i = 1; i >= 0; i--) {
583 outw(MDIO_ENB_IN, mdio_addr);
584 outw(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
585 }
586 }
587
588 /* Reset and restore all of the 3c574 registers. */
tc574_reset(struct net_device * dev)589 static void tc574_reset(struct net_device *dev)
590 {
591 struct el3_private *lp = netdev_priv(dev);
592 int i;
593 unsigned int ioaddr = dev->base_addr;
594 unsigned long flags;
595
596 tc574_wait_for_completion(dev, TotalReset|0x10);
597
598 spin_lock_irqsave(&lp->window_lock, flags);
599 /* Clear any transactions in progress. */
600 outw(0, ioaddr + RunnerWrCtrl);
601 outw(0, ioaddr + RunnerRdCtrl);
602
603 /* Set the station address and mask. */
604 EL3WINDOW(2);
605 for (i = 0; i < 6; i++)
606 outb(dev->dev_addr[i], ioaddr + i);
607 for (; i < 12; i+=2)
608 outw(0, ioaddr + i);
609
610 /* Reset config options */
611 EL3WINDOW(3);
612 outb((dev->mtu > 1500 ? 0x40 : 0), ioaddr + Wn3_MAC_Ctrl);
613 outl((lp->autoselect ? 0x01000000 : 0) | 0x0062001b,
614 ioaddr + Wn3_Config);
615 /* Roadrunner only: Turn on the MII transceiver. */
616 outw(0x8040, ioaddr + Wn3_Options);
617 mdelay(1);
618 outw(0xc040, ioaddr + Wn3_Options);
619 EL3WINDOW(1);
620 spin_unlock_irqrestore(&lp->window_lock, flags);
621
622 tc574_wait_for_completion(dev, TxReset);
623 tc574_wait_for_completion(dev, RxReset);
624 mdelay(1);
625 spin_lock_irqsave(&lp->window_lock, flags);
626 EL3WINDOW(3);
627 outw(0x8040, ioaddr + Wn3_Options);
628
629 /* Switch to the stats window, and clear all stats by reading. */
630 outw(StatsDisable, ioaddr + EL3_CMD);
631 EL3WINDOW(6);
632 for (i = 0; i < 10; i++)
633 inb(ioaddr + i);
634 inw(ioaddr + 10);
635 inw(ioaddr + 12);
636 EL3WINDOW(4);
637 inb(ioaddr + 12);
638 inb(ioaddr + 13);
639
640 /* .. enable any extra statistics bits.. */
641 outw(0x0040, ioaddr + Wn4_NetDiag);
642
643 EL3WINDOW(1);
644 spin_unlock_irqrestore(&lp->window_lock, flags);
645
646 /* .. re-sync MII and re-fill what NWay is advertising. */
647 mdio_sync(ioaddr, 32);
648 mdio_write(ioaddr, lp->phys, 4, lp->advertising);
649 if (!auto_polarity) {
650 /* works for TDK 78Q2120 series MII's */
651 i = mdio_read(ioaddr, lp->phys, 16) | 0x20;
652 mdio_write(ioaddr, lp->phys, 16, i);
653 }
654
655 spin_lock_irqsave(&lp->window_lock, flags);
656 /* Switch to register set 1 for normal use, just for TxFree. */
657 set_rx_mode(dev);
658 spin_unlock_irqrestore(&lp->window_lock, flags);
659 outw(StatsEnable, ioaddr + EL3_CMD); /* Turn on statistics. */
660 outw(RxEnable, ioaddr + EL3_CMD); /* Enable the receiver. */
661 outw(TxEnable, ioaddr + EL3_CMD); /* Enable transmitter. */
662 /* Allow status bits to be seen. */
663 outw(SetStatusEnb | 0xff, ioaddr + EL3_CMD);
664 /* Ack all pending events, and set active indicator mask. */
665 outw(AckIntr | IntLatch | TxAvailable | RxEarly | IntReq,
666 ioaddr + EL3_CMD);
667 outw(SetIntrEnb | IntLatch | TxAvailable | RxComplete | StatsFull
668 | AdapterFailure | RxEarly, ioaddr + EL3_CMD);
669 }
670
el3_open(struct net_device * dev)671 static int el3_open(struct net_device *dev)
672 {
673 struct el3_private *lp = netdev_priv(dev);
674 struct pcmcia_device *link = lp->p_dev;
675
676 if (!pcmcia_dev_present(link))
677 return -ENODEV;
678
679 link->open++;
680 netif_start_queue(dev);
681
682 tc574_reset(dev);
683 lp->media.expires = jiffies + HZ;
684 add_timer(&lp->media);
685
686 dev_dbg(&link->dev, "%s: opened, status %4.4x.\n",
687 dev->name, inw(dev->base_addr + EL3_STATUS));
688
689 return 0;
690 }
691
el3_tx_timeout(struct net_device * dev,unsigned int txqueue)692 static void el3_tx_timeout(struct net_device *dev, unsigned int txqueue)
693 {
694 unsigned int ioaddr = dev->base_addr;
695
696 netdev_notice(dev, "Transmit timed out!\n");
697 dump_status(dev);
698 dev->stats.tx_errors++;
699 netif_trans_update(dev); /* prevent tx timeout */
700 /* Issue TX_RESET and TX_START commands. */
701 tc574_wait_for_completion(dev, TxReset);
702 outw(TxEnable, ioaddr + EL3_CMD);
703 netif_wake_queue(dev);
704 }
705
pop_tx_status(struct net_device * dev)706 static void pop_tx_status(struct net_device *dev)
707 {
708 unsigned int ioaddr = dev->base_addr;
709 int i;
710
711 /* Clear the Tx status stack. */
712 for (i = 32; i > 0; i--) {
713 u_char tx_status = inb(ioaddr + TxStatus);
714 if (!(tx_status & 0x84))
715 break;
716 /* reset transmitter on jabber error or underrun */
717 if (tx_status & 0x30)
718 tc574_wait_for_completion(dev, TxReset);
719 if (tx_status & 0x38) {
720 pr_debug("%s: transmit error: status 0x%02x\n",
721 dev->name, tx_status);
722 outw(TxEnable, ioaddr + EL3_CMD);
723 dev->stats.tx_aborted_errors++;
724 }
725 outb(0x00, ioaddr + TxStatus); /* Pop the status stack. */
726 }
727 }
728
el3_start_xmit(struct sk_buff * skb,struct net_device * dev)729 static netdev_tx_t el3_start_xmit(struct sk_buff *skb,
730 struct net_device *dev)
731 {
732 unsigned int ioaddr = dev->base_addr;
733 struct el3_private *lp = netdev_priv(dev);
734 unsigned long flags;
735
736 pr_debug("%s: el3_start_xmit(length = %ld) called, "
737 "status %4.4x.\n", dev->name, (long)skb->len,
738 inw(ioaddr + EL3_STATUS));
739
740 spin_lock_irqsave(&lp->window_lock, flags);
741
742 dev->stats.tx_bytes += skb->len;
743
744 /* Put out the doubleword header... */
745 outw(skb->len, ioaddr + TX_FIFO);
746 outw(0, ioaddr + TX_FIFO);
747 /* ... and the packet rounded to a doubleword. */
748 outsl(ioaddr + TX_FIFO, skb->data, (skb->len+3)>>2);
749
750 /* TxFree appears only in Window 1, not offset 0x1c. */
751 if (inw(ioaddr + TxFree) <= 1536) {
752 netif_stop_queue(dev);
753 /* Interrupt us when the FIFO has room for max-sized packet.
754 The threshold is in units of dwords. */
755 outw(SetTxThreshold + (1536>>2), ioaddr + EL3_CMD);
756 }
757
758 pop_tx_status(dev);
759 spin_unlock_irqrestore(&lp->window_lock, flags);
760 dev_kfree_skb(skb);
761 return NETDEV_TX_OK;
762 }
763
764 /* The EL3 interrupt handler. */
el3_interrupt(int irq,void * dev_id)765 static irqreturn_t el3_interrupt(int irq, void *dev_id)
766 {
767 struct net_device *dev = (struct net_device *) dev_id;
768 struct el3_private *lp = netdev_priv(dev);
769 unsigned int ioaddr;
770 unsigned status;
771 int work_budget = max_interrupt_work;
772 int handled = 0;
773
774 if (!netif_device_present(dev))
775 return IRQ_NONE;
776 ioaddr = dev->base_addr;
777
778 pr_debug("%s: interrupt, status %4.4x.\n",
779 dev->name, inw(ioaddr + EL3_STATUS));
780
781 spin_lock(&lp->window_lock);
782
783 while ((status = inw(ioaddr + EL3_STATUS)) &
784 (IntLatch | RxComplete | RxEarly | StatsFull)) {
785 if (!netif_device_present(dev) ||
786 ((status & 0xe000) != 0x2000)) {
787 pr_debug("%s: Interrupt from dead card\n", dev->name);
788 break;
789 }
790
791 handled = 1;
792
793 if (status & RxComplete)
794 work_budget = el3_rx(dev, work_budget);
795
796 if (status & TxAvailable) {
797 pr_debug(" TX room bit was handled.\n");
798 /* There's room in the FIFO for a full-sized packet. */
799 outw(AckIntr | TxAvailable, ioaddr + EL3_CMD);
800 netif_wake_queue(dev);
801 }
802
803 if (status & TxComplete)
804 pop_tx_status(dev);
805
806 if (status & (AdapterFailure | RxEarly | StatsFull)) {
807 /* Handle all uncommon interrupts. */
808 if (status & StatsFull)
809 update_stats(dev);
810 if (status & RxEarly) {
811 work_budget = el3_rx(dev, work_budget);
812 outw(AckIntr | RxEarly, ioaddr + EL3_CMD);
813 }
814 if (status & AdapterFailure) {
815 u16 fifo_diag;
816 EL3WINDOW(4);
817 fifo_diag = inw(ioaddr + Wn4_FIFODiag);
818 EL3WINDOW(1);
819 netdev_notice(dev, "adapter failure, FIFO diagnostic register %04x\n",
820 fifo_diag);
821 if (fifo_diag & 0x0400) {
822 /* Tx overrun */
823 tc574_wait_for_completion(dev, TxReset);
824 outw(TxEnable, ioaddr + EL3_CMD);
825 }
826 if (fifo_diag & 0x2000) {
827 /* Rx underrun */
828 tc574_wait_for_completion(dev, RxReset);
829 set_rx_mode(dev);
830 outw(RxEnable, ioaddr + EL3_CMD);
831 }
832 outw(AckIntr | AdapterFailure, ioaddr + EL3_CMD);
833 }
834 }
835
836 if (--work_budget < 0) {
837 pr_debug("%s: Too much work in interrupt, "
838 "status %4.4x.\n", dev->name, status);
839 /* Clear all interrupts */
840 outw(AckIntr | 0xFF, ioaddr + EL3_CMD);
841 break;
842 }
843 /* Acknowledge the IRQ. */
844 outw(AckIntr | IntReq | IntLatch, ioaddr + EL3_CMD);
845 }
846
847 pr_debug("%s: exiting interrupt, status %4.4x.\n",
848 dev->name, inw(ioaddr + EL3_STATUS));
849
850 spin_unlock(&lp->window_lock);
851 return IRQ_RETVAL(handled);
852 }
853
854 /*
855 This timer serves two purposes: to check for missed interrupts
856 (and as a last resort, poll the NIC for events), and to monitor
857 the MII, reporting changes in cable status.
858 */
media_check(struct timer_list * t)859 static void media_check(struct timer_list *t)
860 {
861 struct el3_private *lp = from_timer(lp, t, media);
862 struct net_device *dev = lp->p_dev->priv;
863 unsigned int ioaddr = dev->base_addr;
864 unsigned long flags;
865 unsigned short /* cable, */ media, partner;
866
867 if (!netif_device_present(dev))
868 goto reschedule;
869
870 /* Check for pending interrupt with expired latency timer: with
871 this, we can limp along even if the interrupt is blocked */
872 if ((inw(ioaddr + EL3_STATUS) & IntLatch) && (inb(ioaddr + Timer) == 0xff)) {
873 if (!lp->fast_poll)
874 netdev_info(dev, "interrupt(s) dropped!\n");
875
876 local_irq_save(flags);
877 el3_interrupt(dev->irq, dev);
878 local_irq_restore(flags);
879
880 lp->fast_poll = HZ;
881 }
882 if (lp->fast_poll) {
883 lp->fast_poll--;
884 lp->media.expires = jiffies + 2*HZ/100;
885 add_timer(&lp->media);
886 return;
887 }
888
889 spin_lock_irqsave(&lp->window_lock, flags);
890 EL3WINDOW(4);
891 media = mdio_read(ioaddr, lp->phys, 1);
892 partner = mdio_read(ioaddr, lp->phys, 5);
893 EL3WINDOW(1);
894
895 if (media != lp->media_status) {
896 if ((media ^ lp->media_status) & 0x0004)
897 netdev_info(dev, "%s link beat\n",
898 (lp->media_status & 0x0004) ? "lost" : "found");
899 if ((media ^ lp->media_status) & 0x0020) {
900 lp->partner = 0;
901 if (lp->media_status & 0x0020) {
902 netdev_info(dev, "autonegotiation restarted\n");
903 } else if (partner) {
904 partner &= lp->advertising;
905 lp->partner = partner;
906 netdev_info(dev, "autonegotiation complete: "
907 "%dbaseT-%cD selected\n",
908 (partner & 0x0180) ? 100 : 10,
909 (partner & 0x0140) ? 'F' : 'H');
910 } else {
911 netdev_info(dev, "link partner did not autonegotiate\n");
912 }
913
914 EL3WINDOW(3);
915 outb((partner & 0x0140 ? 0x20 : 0) |
916 (dev->mtu > 1500 ? 0x40 : 0), ioaddr + Wn3_MAC_Ctrl);
917 EL3WINDOW(1);
918
919 }
920 if (media & 0x0010)
921 netdev_info(dev, "remote fault detected\n");
922 if (media & 0x0002)
923 netdev_info(dev, "jabber detected\n");
924 lp->media_status = media;
925 }
926 spin_unlock_irqrestore(&lp->window_lock, flags);
927
928 reschedule:
929 lp->media.expires = jiffies + HZ;
930 add_timer(&lp->media);
931 }
932
el3_get_stats(struct net_device * dev)933 static struct net_device_stats *el3_get_stats(struct net_device *dev)
934 {
935 struct el3_private *lp = netdev_priv(dev);
936
937 if (netif_device_present(dev)) {
938 unsigned long flags;
939 spin_lock_irqsave(&lp->window_lock, flags);
940 update_stats(dev);
941 spin_unlock_irqrestore(&lp->window_lock, flags);
942 }
943 return &dev->stats;
944 }
945
946 /* Update statistics.
947 Surprisingly this need not be run single-threaded, but it effectively is.
948 The counters clear when read, so the adds must merely be atomic.
949 */
update_stats(struct net_device * dev)950 static void update_stats(struct net_device *dev)
951 {
952 unsigned int ioaddr = dev->base_addr;
953 u8 up;
954
955 pr_debug("%s: updating the statistics.\n", dev->name);
956
957 if (inw(ioaddr+EL3_STATUS) == 0xffff) /* No card. */
958 return;
959
960 /* Unlike the 3c509 we need not turn off stats updates while reading. */
961 /* Switch to the stats window, and read everything. */
962 EL3WINDOW(6);
963 dev->stats.tx_carrier_errors += inb(ioaddr + 0);
964 dev->stats.tx_heartbeat_errors += inb(ioaddr + 1);
965 /* Multiple collisions. */ inb(ioaddr + 2);
966 dev->stats.collisions += inb(ioaddr + 3);
967 dev->stats.tx_window_errors += inb(ioaddr + 4);
968 dev->stats.rx_fifo_errors += inb(ioaddr + 5);
969 dev->stats.tx_packets += inb(ioaddr + 6);
970 up = inb(ioaddr + 9);
971 dev->stats.tx_packets += (up&0x30) << 4;
972 /* Rx packets */ inb(ioaddr + 7);
973 /* Tx deferrals */ inb(ioaddr + 8);
974 /* rx */ inw(ioaddr + 10);
975 /* tx */ inw(ioaddr + 12);
976
977 EL3WINDOW(4);
978 /* BadSSD */ inb(ioaddr + 12);
979 up = inb(ioaddr + 13);
980
981 EL3WINDOW(1);
982 }
983
el3_rx(struct net_device * dev,int worklimit)984 static int el3_rx(struct net_device *dev, int worklimit)
985 {
986 unsigned int ioaddr = dev->base_addr;
987 short rx_status;
988
989 pr_debug("%s: in rx_packet(), status %4.4x, rx_status %4.4x.\n",
990 dev->name, inw(ioaddr+EL3_STATUS), inw(ioaddr+RxStatus));
991 while (!((rx_status = inw(ioaddr + RxStatus)) & 0x8000) &&
992 worklimit > 0) {
993 worklimit--;
994 if (rx_status & 0x4000) { /* Error, update stats. */
995 short error = rx_status & 0x3800;
996 dev->stats.rx_errors++;
997 switch (error) {
998 case 0x0000: dev->stats.rx_over_errors++; break;
999 case 0x0800: dev->stats.rx_length_errors++; break;
1000 case 0x1000: dev->stats.rx_frame_errors++; break;
1001 case 0x1800: dev->stats.rx_length_errors++; break;
1002 case 0x2000: dev->stats.rx_frame_errors++; break;
1003 case 0x2800: dev->stats.rx_crc_errors++; break;
1004 }
1005 } else {
1006 short pkt_len = rx_status & 0x7ff;
1007 struct sk_buff *skb;
1008
1009 skb = netdev_alloc_skb(dev, pkt_len + 5);
1010
1011 pr_debug(" Receiving packet size %d status %4.4x.\n",
1012 pkt_len, rx_status);
1013 if (skb != NULL) {
1014 skb_reserve(skb, 2);
1015 insl(ioaddr+RX_FIFO, skb_put(skb, pkt_len),
1016 ((pkt_len+3)>>2));
1017 skb->protocol = eth_type_trans(skb, dev);
1018 netif_rx(skb);
1019 dev->stats.rx_packets++;
1020 dev->stats.rx_bytes += pkt_len;
1021 } else {
1022 pr_debug("%s: couldn't allocate a sk_buff of"
1023 " size %d.\n", dev->name, pkt_len);
1024 dev->stats.rx_dropped++;
1025 }
1026 }
1027 tc574_wait_for_completion(dev, RxDiscard);
1028 }
1029
1030 return worklimit;
1031 }
1032
1033 /* Provide ioctl() calls to examine the MII xcvr state. */
el3_ioctl(struct net_device * dev,struct ifreq * rq,int cmd)1034 static int el3_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1035 {
1036 struct el3_private *lp = netdev_priv(dev);
1037 unsigned int ioaddr = dev->base_addr;
1038 struct mii_ioctl_data *data = if_mii(rq);
1039 int phy = lp->phys & 0x1f;
1040
1041 pr_debug("%s: In ioct(%-.6s, %#4.4x) %4.4x %4.4x %4.4x %4.4x.\n",
1042 dev->name, rq->ifr_ifrn.ifrn_name, cmd,
1043 data->phy_id, data->reg_num, data->val_in, data->val_out);
1044
1045 switch(cmd) {
1046 case SIOCGMIIPHY: /* Get the address of the PHY in use. */
1047 data->phy_id = phy;
1048 fallthrough;
1049 case SIOCGMIIREG: /* Read the specified MII register. */
1050 {
1051 int saved_window;
1052 unsigned long flags;
1053
1054 spin_lock_irqsave(&lp->window_lock, flags);
1055 saved_window = inw(ioaddr + EL3_CMD) >> 13;
1056 EL3WINDOW(4);
1057 data->val_out = mdio_read(ioaddr, data->phy_id & 0x1f,
1058 data->reg_num & 0x1f);
1059 EL3WINDOW(saved_window);
1060 spin_unlock_irqrestore(&lp->window_lock, flags);
1061 return 0;
1062 }
1063 case SIOCSMIIREG: /* Write the specified MII register */
1064 {
1065 int saved_window;
1066 unsigned long flags;
1067
1068 spin_lock_irqsave(&lp->window_lock, flags);
1069 saved_window = inw(ioaddr + EL3_CMD) >> 13;
1070 EL3WINDOW(4);
1071 mdio_write(ioaddr, data->phy_id & 0x1f,
1072 data->reg_num & 0x1f, data->val_in);
1073 EL3WINDOW(saved_window);
1074 spin_unlock_irqrestore(&lp->window_lock, flags);
1075 return 0;
1076 }
1077 default:
1078 return -EOPNOTSUPP;
1079 }
1080 }
1081
1082 /* The Odie chip has a 64 bin multicast filter, but the bit layout is not
1083 documented. Until it is we revert to receiving all multicast frames when
1084 any multicast reception is desired.
1085 Note: My other drivers emit a log message whenever promiscuous mode is
1086 entered to help detect password sniffers. This is less desirable on
1087 typical PC card machines, so we omit the message.
1088 */
1089
set_rx_mode(struct net_device * dev)1090 static void set_rx_mode(struct net_device *dev)
1091 {
1092 unsigned int ioaddr = dev->base_addr;
1093
1094 if (dev->flags & IFF_PROMISC)
1095 outw(SetRxFilter | RxStation | RxMulticast | RxBroadcast | RxProm,
1096 ioaddr + EL3_CMD);
1097 else if (!netdev_mc_empty(dev) || (dev->flags & IFF_ALLMULTI))
1098 outw(SetRxFilter|RxStation|RxMulticast|RxBroadcast, ioaddr + EL3_CMD);
1099 else
1100 outw(SetRxFilter | RxStation | RxBroadcast, ioaddr + EL3_CMD);
1101 }
1102
set_multicast_list(struct net_device * dev)1103 static void set_multicast_list(struct net_device *dev)
1104 {
1105 struct el3_private *lp = netdev_priv(dev);
1106 unsigned long flags;
1107
1108 spin_lock_irqsave(&lp->window_lock, flags);
1109 set_rx_mode(dev);
1110 spin_unlock_irqrestore(&lp->window_lock, flags);
1111 }
1112
el3_close(struct net_device * dev)1113 static int el3_close(struct net_device *dev)
1114 {
1115 unsigned int ioaddr = dev->base_addr;
1116 struct el3_private *lp = netdev_priv(dev);
1117 struct pcmcia_device *link = lp->p_dev;
1118
1119 dev_dbg(&link->dev, "%s: shutting down ethercard.\n", dev->name);
1120
1121 if (pcmcia_dev_present(link)) {
1122 unsigned long flags;
1123
1124 /* Turn off statistics ASAP. We update lp->stats below. */
1125 outw(StatsDisable, ioaddr + EL3_CMD);
1126
1127 /* Disable the receiver and transmitter. */
1128 outw(RxDisable, ioaddr + EL3_CMD);
1129 outw(TxDisable, ioaddr + EL3_CMD);
1130
1131 /* Note: Switching to window 0 may disable the IRQ. */
1132 EL3WINDOW(0);
1133 spin_lock_irqsave(&lp->window_lock, flags);
1134 update_stats(dev);
1135 spin_unlock_irqrestore(&lp->window_lock, flags);
1136
1137 /* force interrupts off */
1138 outw(SetIntrEnb | 0x0000, ioaddr + EL3_CMD);
1139 }
1140
1141 link->open--;
1142 netif_stop_queue(dev);
1143 del_timer_sync(&lp->media);
1144
1145 return 0;
1146 }
1147
1148 static const struct pcmcia_device_id tc574_ids[] = {
1149 PCMCIA_DEVICE_MANF_CARD(0x0101, 0x0574),
1150 PCMCIA_MFC_DEVICE_CIS_MANF_CARD(0, 0x0101, 0x0556, "cis/3CCFEM556.cis"),
1151 PCMCIA_DEVICE_NULL,
1152 };
1153 MODULE_DEVICE_TABLE(pcmcia, tc574_ids);
1154
1155 static struct pcmcia_driver tc574_driver = {
1156 .owner = THIS_MODULE,
1157 .name = "3c574_cs",
1158 .probe = tc574_probe,
1159 .remove = tc574_detach,
1160 .id_table = tc574_ids,
1161 .suspend = tc574_suspend,
1162 .resume = tc574_resume,
1163 };
1164 module_pcmcia_driver(tc574_driver);
1165