1 /* lance.c: An AMD LANCE/PCnet ethernet driver for Linux. */
2 /*
3 Written/copyright 1993-1998 by Donald Becker.
4
5 Copyright 1993 United States Government as represented by the
6 Director, National Security Agency.
7 This software may be used and distributed according to the terms
8 of the GNU General Public License, incorporated herein by reference.
9
10 This driver is for the Allied Telesis AT1500 and HP J2405A, and should work
11 with most other LANCE-based bus-master (NE2100/NE2500) ethercards.
12
13 The author may be reached as becker@scyld.com, or C/O
14 Scyld Computing Corporation
15 410 Severn Ave., Suite 210
16 Annapolis MD 21403
17
18 Andrey V. Savochkin:
19 - alignment problem with 1.3.* kernel and some minor changes.
20 Thomas Bogendoerfer (tsbogend@bigbug.franken.de):
21 - added support for Linux/Alpha, but removed most of it, because
22 it worked only for the PCI chip.
23 - added hook for the 32bit lance driver
24 - added PCnetPCI II (79C970A) to chip table
25 Paul Gortmaker (gpg109@rsphy1.anu.edu.au):
26 - hopefully fix above so Linux/Alpha can use ISA cards too.
27 8/20/96 Fixed 7990 autoIRQ failure and reversed unneeded alignment -djb
28 v1.12 10/27/97 Module support -djb
29 v1.14 2/3/98 Module support modified, made PCI support optional -djb
30 v1.15 5/27/99 Fixed bug in the cleanup_module(). dev->priv was freed
31 before unregister_netdev() which caused NULL pointer
32 reference later in the chain (in rtnetlink_fill_ifinfo())
33 -- Mika Kuoppala <miku@iki.fi>
34
35 Forward ported v1.14 to 2.1.129, merged the PCI and misc changes from
36 the 2.1 version of the old driver - Alan Cox
37
38 Get rid of check_region, check kmalloc return in lance_probe1
39 Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 11/01/2001
40
41 Reworked detection, added support for Racal InterLan EtherBlaster cards
42 Vesselin Kostadinov <vesok at yahoo dot com > - 22/4/2004
43 */
44
45 static const char version[] = "lance.c:v1.16 2006/11/09 dplatt@3do.com, becker@cesdis.gsfc.nasa.gov\n";
46
47 #include <linux/module.h>
48 #include <linux/kernel.h>
49 #include <linux/string.h>
50 #include <linux/delay.h>
51 #include <linux/errno.h>
52 #include <linux/ioport.h>
53 #include <linux/slab.h>
54 #include <linux/interrupt.h>
55 #include <linux/pci.h>
56 #include <linux/init.h>
57 #include <linux/netdevice.h>
58 #include <linux/etherdevice.h>
59 #include <linux/skbuff.h>
60 #include <linux/mm.h>
61 #include <linux/bitops.h>
62
63 #include <asm/io.h>
64 #include <asm/dma.h>
65
66 static unsigned int lance_portlist[] __initdata = { 0x300, 0x320, 0x340, 0x360, 0};
67 static int lance_probe1(struct net_device *dev, int ioaddr, int irq, int options);
68 static int __init do_lance_probe(struct net_device *dev);
69
70
71 static struct card {
72 char id_offset14;
73 char id_offset15;
74 } cards[] = {
75 { //"normal"
76 .id_offset14 = 0x57,
77 .id_offset15 = 0x57,
78 },
79 { //NI6510EB
80 .id_offset14 = 0x52,
81 .id_offset15 = 0x44,
82 },
83 { //Racal InterLan EtherBlaster
84 .id_offset14 = 0x52,
85 .id_offset15 = 0x49,
86 },
87 };
88 #define NUM_CARDS 3
89
90 #ifdef LANCE_DEBUG
91 static int lance_debug = LANCE_DEBUG;
92 #else
93 static int lance_debug = 1;
94 #endif
95
96 /*
97 Theory of Operation
98
99 I. Board Compatibility
100
101 This device driver is designed for the AMD 79C960, the "PCnet-ISA
102 single-chip ethernet controller for ISA". This chip is used in a wide
103 variety of boards from vendors such as Allied Telesis, HP, Kingston,
104 and Boca. This driver is also intended to work with older AMD 7990
105 designs, such as the NE1500 and NE2100, and newer 79C961. For convenience,
106 I use the name LANCE to refer to all of the AMD chips, even though it properly
107 refers only to the original 7990.
108
109 II. Board-specific settings
110
111 The driver is designed to work the boards that use the faster
112 bus-master mode, rather than in shared memory mode. (Only older designs
113 have on-board buffer memory needed to support the slower shared memory mode.)
114
115 Most ISA boards have jumpered settings for the I/O base, IRQ line, and DMA
116 channel. This driver probes the likely base addresses:
117 {0x300, 0x320, 0x340, 0x360}.
118 After the board is found it generates a DMA-timeout interrupt and uses
119 autoIRQ to find the IRQ line. The DMA channel can be set with the low bits
120 of the otherwise-unused dev->mem_start value (aka PARAM1). If unset it is
121 probed for by enabling each free DMA channel in turn and checking if
122 initialization succeeds.
123
124 The HP-J2405A board is an exception: with this board it is easy to read the
125 EEPROM-set values for the base, IRQ, and DMA. (Of course you must already
126 _know_ the base address -- that field is for writing the EEPROM.)
127
128 III. Driver operation
129
130 IIIa. Ring buffers
131 The LANCE uses ring buffers of Tx and Rx descriptors. Each entry describes
132 the base and length of the data buffer, along with status bits. The length
133 of these buffers is set by LANCE_LOG_{RX,TX}_BUFFERS, which is log_2() of
134 the buffer length (rather than being directly the buffer length) for
135 implementation ease. The current values are 2 (Tx) and 4 (Rx), which leads to
136 ring sizes of 4 (Tx) and 16 (Rx). Increasing the number of ring entries
137 needlessly uses extra space and reduces the chance that an upper layer will
138 be able to reorder queued Tx packets based on priority. Decreasing the number
139 of entries makes it more difficult to achieve back-to-back packet transmission
140 and increases the chance that Rx ring will overflow. (Consider the worst case
141 of receiving back-to-back minimum-sized packets.)
142
143 The LANCE has the capability to "chain" both Rx and Tx buffers, but this driver
144 statically allocates full-sized (slightly oversized -- PKT_BUF_SZ) buffers to
145 avoid the administrative overhead. For the Rx side this avoids dynamically
146 allocating full-sized buffers "just in case", at the expense of a
147 memory-to-memory data copy for each packet received. For most systems this
148 is a good tradeoff: the Rx buffer will always be in low memory, the copy
149 is inexpensive, and it primes the cache for later packet processing. For Tx
150 the buffers are only used when needed as low-memory bounce buffers.
151
152 IIIB. 16M memory limitations.
153 For the ISA bus master mode all structures used directly by the LANCE,
154 the initialization block, Rx and Tx rings, and data buffers, must be
155 accessible from the ISA bus, i.e. in the lower 16M of real memory.
156 This is a problem for current Linux kernels on >16M machines. The network
157 devices are initialized after memory initialization, and the kernel doles out
158 memory from the top of memory downward. The current solution is to have a
159 special network initialization routine that's called before memory
160 initialization; this will eventually be generalized for all network devices.
161 As mentioned before, low-memory "bounce-buffers" are used when needed.
162
163 IIIC. Synchronization
164 The driver runs as two independent, single-threaded flows of control. One
165 is the send-packet routine, which enforces single-threaded use by the
166 dev->tbusy flag. The other thread is the interrupt handler, which is single
167 threaded by the hardware and other software.
168
169 The send packet thread has partial control over the Tx ring and 'dev->tbusy'
170 flag. It sets the tbusy flag whenever it's queuing a Tx packet. If the next
171 queue slot is empty, it clears the tbusy flag when finished otherwise it sets
172 the 'lp->tx_full' flag.
173
174 The interrupt handler has exclusive control over the Rx ring and records stats
175 from the Tx ring. (The Tx-done interrupt can't be selectively turned off, so
176 we can't avoid the interrupt overhead by having the Tx routine reap the Tx
177 stats.) After reaping the stats, it marks the queue entry as empty by setting
178 the 'base' to zero. Iff the 'lp->tx_full' flag is set, it clears both the
179 tx_full and tbusy flags.
180
181 */
182
183 /* Set the number of Tx and Rx buffers, using Log_2(# buffers).
184 Reasonable default values are 16 Tx buffers, and 16 Rx buffers.
185 That translates to 4 and 4 (16 == 2^^4).
186 This is a compile-time option for efficiency.
187 */
188 #ifndef LANCE_LOG_TX_BUFFERS
189 #define LANCE_LOG_TX_BUFFERS 4
190 #define LANCE_LOG_RX_BUFFERS 4
191 #endif
192
193 #define TX_RING_SIZE (1 << (LANCE_LOG_TX_BUFFERS))
194 #define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
195 #define TX_RING_LEN_BITS ((LANCE_LOG_TX_BUFFERS) << 29)
196
197 #define RX_RING_SIZE (1 << (LANCE_LOG_RX_BUFFERS))
198 #define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
199 #define RX_RING_LEN_BITS ((LANCE_LOG_RX_BUFFERS) << 29)
200
201 #define PKT_BUF_SZ 1544
202
203 /* Offsets from base I/O address. */
204 #define LANCE_DATA 0x10
205 #define LANCE_ADDR 0x12
206 #define LANCE_RESET 0x14
207 #define LANCE_BUS_IF 0x16
208 #define LANCE_TOTAL_SIZE 0x18
209
210 #define TX_TIMEOUT (HZ/5)
211
212 /* The LANCE Rx and Tx ring descriptors. */
213 struct lance_rx_head {
214 s32 base;
215 s16 buf_length; /* This length is 2s complement (negative)! */
216 s16 msg_length; /* This length is "normal". */
217 };
218
219 struct lance_tx_head {
220 s32 base;
221 s16 length; /* Length is 2s complement (negative)! */
222 s16 misc;
223 };
224
225 /* The LANCE initialization block, described in databook. */
226 struct lance_init_block {
227 u16 mode; /* Pre-set mode (reg. 15) */
228 u8 phys_addr[6]; /* Physical ethernet address */
229 u32 filter[2]; /* Multicast filter (unused). */
230 /* Receive and transmit ring base, along with extra bits. */
231 u32 rx_ring; /* Tx and Rx ring base pointers */
232 u32 tx_ring;
233 };
234
235 struct lance_private {
236 /* The Tx and Rx ring entries must be aligned on 8-byte boundaries. */
237 struct lance_rx_head rx_ring[RX_RING_SIZE];
238 struct lance_tx_head tx_ring[TX_RING_SIZE];
239 struct lance_init_block init_block;
240 const char *name;
241 /* The saved address of a sent-in-place packet/buffer, for skfree(). */
242 struct sk_buff* tx_skbuff[TX_RING_SIZE];
243 /* The addresses of receive-in-place skbuffs. */
244 struct sk_buff* rx_skbuff[RX_RING_SIZE];
245 unsigned long rx_buffs; /* Address of Rx and Tx buffers. */
246 /* Tx low-memory "bounce buffer" address. */
247 char (*tx_bounce_buffs)[PKT_BUF_SZ];
248 int cur_rx, cur_tx; /* The next free ring entry */
249 int dirty_rx, dirty_tx; /* The ring entries to be free()ed. */
250 int dma;
251 unsigned char chip_version; /* See lance_chip_type. */
252 spinlock_t devlock;
253 };
254
255 #define LANCE_MUST_PAD 0x00000001
256 #define LANCE_ENABLE_AUTOSELECT 0x00000002
257 #define LANCE_MUST_REINIT_RING 0x00000004
258 #define LANCE_MUST_UNRESET 0x00000008
259 #define LANCE_HAS_MISSED_FRAME 0x00000010
260
261 /* A mapping from the chip ID number to the part number and features.
262 These are from the datasheets -- in real life the '970 version
263 reportedly has the same ID as the '965. */
264 static struct lance_chip_type {
265 int id_number;
266 const char *name;
267 int flags;
268 } chip_table[] = {
269 {0x0000, "LANCE 7990", /* Ancient lance chip. */
270 LANCE_MUST_PAD + LANCE_MUST_UNRESET},
271 {0x0003, "PCnet/ISA 79C960", /* 79C960 PCnet/ISA. */
272 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
273 LANCE_HAS_MISSED_FRAME},
274 {0x2260, "PCnet/ISA+ 79C961", /* 79C961 PCnet/ISA+, Plug-n-Play. */
275 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
276 LANCE_HAS_MISSED_FRAME},
277 {0x2420, "PCnet/PCI 79C970", /* 79C970 or 79C974 PCnet-SCSI, PCI. */
278 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
279 LANCE_HAS_MISSED_FRAME},
280 /* Bug: the PCnet/PCI actually uses the PCnet/VLB ID number, so just call
281 it the PCnet32. */
282 {0x2430, "PCnet32", /* 79C965 PCnet for VL bus. */
283 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
284 LANCE_HAS_MISSED_FRAME},
285 {0x2621, "PCnet/PCI-II 79C970A", /* 79C970A PCInetPCI II. */
286 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
287 LANCE_HAS_MISSED_FRAME},
288 {0x0, "PCnet (unknown)",
289 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
290 LANCE_HAS_MISSED_FRAME},
291 };
292
293 enum {OLD_LANCE = 0, PCNET_ISA=1, PCNET_ISAP=2, PCNET_PCI=3, PCNET_VLB=4, PCNET_PCI_II=5, LANCE_UNKNOWN=6};
294
295
296 /* Non-zero if lance_probe1() needs to allocate low-memory bounce buffers.
297 Assume yes until we know the memory size. */
298 static unsigned char lance_need_isa_bounce_buffers = 1;
299
300 static int lance_open(struct net_device *dev);
301 static void lance_init_ring(struct net_device *dev, gfp_t mode);
302 static netdev_tx_t lance_start_xmit(struct sk_buff *skb,
303 struct net_device *dev);
304 static int lance_rx(struct net_device *dev);
305 static irqreturn_t lance_interrupt(int irq, void *dev_id);
306 static int lance_close(struct net_device *dev);
307 static struct net_device_stats *lance_get_stats(struct net_device *dev);
308 static void set_multicast_list(struct net_device *dev);
309 static void lance_tx_timeout (struct net_device *dev, unsigned int txqueue);
310
311
312
313 #ifdef MODULE
314 #define MAX_CARDS 8 /* Max number of interfaces (cards) per module */
315
316 static struct net_device *dev_lance[MAX_CARDS];
317 static int io[MAX_CARDS];
318 static int dma[MAX_CARDS];
319 static int irq[MAX_CARDS];
320
321 module_param_hw_array(io, int, ioport, NULL, 0);
322 module_param_hw_array(dma, int, dma, NULL, 0);
323 module_param_hw_array(irq, int, irq, NULL, 0);
324 module_param(lance_debug, int, 0);
325 MODULE_PARM_DESC(io, "LANCE/PCnet I/O base address(es),required");
326 MODULE_PARM_DESC(dma, "LANCE/PCnet ISA DMA channel (ignored for some devices)");
327 MODULE_PARM_DESC(irq, "LANCE/PCnet IRQ number (ignored for some devices)");
328 MODULE_PARM_DESC(lance_debug, "LANCE/PCnet debug level (0-7)");
329
init_module(void)330 int __init init_module(void)
331 {
332 struct net_device *dev;
333 int this_dev, found = 0;
334
335 for (this_dev = 0; this_dev < MAX_CARDS; this_dev++) {
336 if (io[this_dev] == 0) {
337 if (this_dev != 0) /* only complain once */
338 break;
339 printk(KERN_NOTICE "lance.c: Module autoprobing not allowed. Append \"io=0xNNN\" value(s).\n");
340 return -EPERM;
341 }
342 dev = alloc_etherdev(0);
343 if (!dev)
344 break;
345 dev->irq = irq[this_dev];
346 dev->base_addr = io[this_dev];
347 dev->dma = dma[this_dev];
348 if (do_lance_probe(dev) == 0) {
349 dev_lance[found++] = dev;
350 continue;
351 }
352 free_netdev(dev);
353 break;
354 }
355 if (found != 0)
356 return 0;
357 return -ENXIO;
358 }
359
cleanup_card(struct net_device * dev)360 static void cleanup_card(struct net_device *dev)
361 {
362 struct lance_private *lp = dev->ml_priv;
363 if (dev->dma != 4)
364 free_dma(dev->dma);
365 release_region(dev->base_addr, LANCE_TOTAL_SIZE);
366 kfree(lp->tx_bounce_buffs);
367 kfree((void*)lp->rx_buffs);
368 kfree(lp);
369 }
370
cleanup_module(void)371 void __exit cleanup_module(void)
372 {
373 int this_dev;
374
375 for (this_dev = 0; this_dev < MAX_CARDS; this_dev++) {
376 struct net_device *dev = dev_lance[this_dev];
377 if (dev) {
378 unregister_netdev(dev);
379 cleanup_card(dev);
380 free_netdev(dev);
381 }
382 }
383 }
384 #endif /* MODULE */
385 MODULE_LICENSE("GPL");
386
387
388 /* Starting in v2.1.*, the LANCE/PCnet probe is now similar to the other
389 board probes now that kmalloc() can allocate ISA DMA-able regions.
390 This also allows the LANCE driver to be used as a module.
391 */
do_lance_probe(struct net_device * dev)392 static int __init do_lance_probe(struct net_device *dev)
393 {
394 unsigned int *port;
395 int result;
396
397 if (high_memory <= phys_to_virt(16*1024*1024))
398 lance_need_isa_bounce_buffers = 0;
399
400 for (port = lance_portlist; *port; port++) {
401 int ioaddr = *port;
402 struct resource *r = request_region(ioaddr, LANCE_TOTAL_SIZE,
403 "lance-probe");
404
405 if (r) {
406 /* Detect the card with minimal I/O reads */
407 char offset14 = inb(ioaddr + 14);
408 int card;
409 for (card = 0; card < NUM_CARDS; ++card)
410 if (cards[card].id_offset14 == offset14)
411 break;
412 if (card < NUM_CARDS) {/*yes, the first byte matches*/
413 char offset15 = inb(ioaddr + 15);
414 for (card = 0; card < NUM_CARDS; ++card)
415 if ((cards[card].id_offset14 == offset14) &&
416 (cards[card].id_offset15 == offset15))
417 break;
418 }
419 if (card < NUM_CARDS) { /*Signature OK*/
420 result = lance_probe1(dev, ioaddr, 0, 0);
421 if (!result) {
422 struct lance_private *lp = dev->ml_priv;
423 int ver = lp->chip_version;
424
425 r->name = chip_table[ver].name;
426 return 0;
427 }
428 }
429 release_region(ioaddr, LANCE_TOTAL_SIZE);
430 }
431 }
432 return -ENODEV;
433 }
434
435 #ifndef MODULE
lance_probe(int unit)436 struct net_device * __init lance_probe(int unit)
437 {
438 struct net_device *dev = alloc_etherdev(0);
439 int err;
440
441 if (!dev)
442 return ERR_PTR(-ENODEV);
443
444 sprintf(dev->name, "eth%d", unit);
445 netdev_boot_setup_check(dev);
446
447 err = do_lance_probe(dev);
448 if (err)
449 goto out;
450 return dev;
451 out:
452 free_netdev(dev);
453 return ERR_PTR(err);
454 }
455 #endif
456
457 static const struct net_device_ops lance_netdev_ops = {
458 .ndo_open = lance_open,
459 .ndo_start_xmit = lance_start_xmit,
460 .ndo_stop = lance_close,
461 .ndo_get_stats = lance_get_stats,
462 .ndo_set_rx_mode = set_multicast_list,
463 .ndo_tx_timeout = lance_tx_timeout,
464 .ndo_set_mac_address = eth_mac_addr,
465 .ndo_validate_addr = eth_validate_addr,
466 };
467
lance_probe1(struct net_device * dev,int ioaddr,int irq,int options)468 static int __init lance_probe1(struct net_device *dev, int ioaddr, int irq, int options)
469 {
470 struct lance_private *lp;
471 unsigned long dma_channels; /* Mark spuriously-busy DMA channels */
472 int i, reset_val, lance_version;
473 const char *chipname;
474 /* Flags for specific chips or boards. */
475 unsigned char hpJ2405A = 0; /* HP ISA adaptor */
476 int hp_builtin = 0; /* HP on-board ethernet. */
477 static int did_version; /* Already printed version info. */
478 unsigned long flags;
479 int err = -ENOMEM;
480 void __iomem *bios;
481
482 /* First we look for special cases.
483 Check for HP's on-board ethernet by looking for 'HP' in the BIOS.
484 There are two HP versions, check the BIOS for the configuration port.
485 This method provided by L. Julliard, Laurent_Julliard@grenoble.hp.com.
486 */
487 bios = ioremap(0xf00f0, 0x14);
488 if (!bios)
489 return -ENOMEM;
490 if (readw(bios + 0x12) == 0x5048) {
491 static const short ioaddr_table[] = { 0x300, 0x320, 0x340, 0x360};
492 int hp_port = (readl(bios + 1) & 1) ? 0x499 : 0x99;
493 /* We can have boards other than the built-in! Verify this is on-board. */
494 if ((inb(hp_port) & 0xc0) == 0x80 &&
495 ioaddr_table[inb(hp_port) & 3] == ioaddr)
496 hp_builtin = hp_port;
497 }
498 iounmap(bios);
499 /* We also recognize the HP Vectra on-board here, but check below. */
500 hpJ2405A = (inb(ioaddr) == 0x08 && inb(ioaddr+1) == 0x00 &&
501 inb(ioaddr+2) == 0x09);
502
503 /* Reset the LANCE. */
504 reset_val = inw(ioaddr+LANCE_RESET); /* Reset the LANCE */
505
506 /* The Un-Reset needed is only needed for the real NE2100, and will
507 confuse the HP board. */
508 if (!hpJ2405A)
509 outw(reset_val, ioaddr+LANCE_RESET);
510
511 outw(0x0000, ioaddr+LANCE_ADDR); /* Switch to window 0 */
512 if (inw(ioaddr+LANCE_DATA) != 0x0004)
513 return -ENODEV;
514
515 /* Get the version of the chip. */
516 outw(88, ioaddr+LANCE_ADDR);
517 if (inw(ioaddr+LANCE_ADDR) != 88) {
518 lance_version = 0;
519 } else { /* Good, it's a newer chip. */
520 int chip_version = inw(ioaddr+LANCE_DATA);
521 outw(89, ioaddr+LANCE_ADDR);
522 chip_version |= inw(ioaddr+LANCE_DATA) << 16;
523 if (lance_debug > 2)
524 printk(" LANCE chip version is %#x.\n", chip_version);
525 if ((chip_version & 0xfff) != 0x003)
526 return -ENODEV;
527 chip_version = (chip_version >> 12) & 0xffff;
528 for (lance_version = 1; chip_table[lance_version].id_number; lance_version++) {
529 if (chip_table[lance_version].id_number == chip_version)
530 break;
531 }
532 }
533
534 /* We can't allocate private data from alloc_etherdev() because it must
535 a ISA DMA-able region. */
536 chipname = chip_table[lance_version].name;
537 printk("%s: %s at %#3x, ", dev->name, chipname, ioaddr);
538
539 /* There is a 16 byte station address PROM at the base address.
540 The first six bytes are the station address. */
541 for (i = 0; i < 6; i++)
542 dev->dev_addr[i] = inb(ioaddr + i);
543 printk("%pM", dev->dev_addr);
544
545 dev->base_addr = ioaddr;
546 /* Make certain the data structures used by the LANCE are aligned and DMAble. */
547
548 lp = kzalloc(sizeof(*lp), GFP_DMA | GFP_KERNEL);
549 if (!lp)
550 return -ENOMEM;
551 if (lance_debug > 6) printk(" (#0x%05lx)", (unsigned long)lp);
552 dev->ml_priv = lp;
553 lp->name = chipname;
554 lp->rx_buffs = (unsigned long)kmalloc_array(RX_RING_SIZE, PKT_BUF_SZ,
555 GFP_DMA | GFP_KERNEL);
556 if (!lp->rx_buffs)
557 goto out_lp;
558 if (lance_need_isa_bounce_buffers) {
559 lp->tx_bounce_buffs = kmalloc_array(TX_RING_SIZE, PKT_BUF_SZ,
560 GFP_DMA | GFP_KERNEL);
561 if (!lp->tx_bounce_buffs)
562 goto out_rx;
563 } else
564 lp->tx_bounce_buffs = NULL;
565
566 lp->chip_version = lance_version;
567 spin_lock_init(&lp->devlock);
568
569 lp->init_block.mode = 0x0003; /* Disable Rx and Tx. */
570 for (i = 0; i < 6; i++)
571 lp->init_block.phys_addr[i] = dev->dev_addr[i];
572 lp->init_block.filter[0] = 0x00000000;
573 lp->init_block.filter[1] = 0x00000000;
574 lp->init_block.rx_ring = ((u32)isa_virt_to_bus(lp->rx_ring) & 0xffffff) | RX_RING_LEN_BITS;
575 lp->init_block.tx_ring = ((u32)isa_virt_to_bus(lp->tx_ring) & 0xffffff) | TX_RING_LEN_BITS;
576
577 outw(0x0001, ioaddr+LANCE_ADDR);
578 inw(ioaddr+LANCE_ADDR);
579 outw((short) (u32) isa_virt_to_bus(&lp->init_block), ioaddr+LANCE_DATA);
580 outw(0x0002, ioaddr+LANCE_ADDR);
581 inw(ioaddr+LANCE_ADDR);
582 outw(((u32)isa_virt_to_bus(&lp->init_block)) >> 16, ioaddr+LANCE_DATA);
583 outw(0x0000, ioaddr+LANCE_ADDR);
584 inw(ioaddr+LANCE_ADDR);
585
586 if (irq) { /* Set iff PCI card. */
587 dev->dma = 4; /* Native bus-master, no DMA channel needed. */
588 dev->irq = irq;
589 } else if (hp_builtin) {
590 static const char dma_tbl[4] = {3, 5, 6, 0};
591 static const char irq_tbl[4] = {3, 4, 5, 9};
592 unsigned char port_val = inb(hp_builtin);
593 dev->dma = dma_tbl[(port_val >> 4) & 3];
594 dev->irq = irq_tbl[(port_val >> 2) & 3];
595 printk(" HP Vectra IRQ %d DMA %d.\n", dev->irq, dev->dma);
596 } else if (hpJ2405A) {
597 static const char dma_tbl[4] = {3, 5, 6, 7};
598 static const char irq_tbl[8] = {3, 4, 5, 9, 10, 11, 12, 15};
599 short reset_val = inw(ioaddr+LANCE_RESET);
600 dev->dma = dma_tbl[(reset_val >> 2) & 3];
601 dev->irq = irq_tbl[(reset_val >> 4) & 7];
602 printk(" HP J2405A IRQ %d DMA %d.\n", dev->irq, dev->dma);
603 } else if (lance_version == PCNET_ISAP) { /* The plug-n-play version. */
604 short bus_info;
605 outw(8, ioaddr+LANCE_ADDR);
606 bus_info = inw(ioaddr+LANCE_BUS_IF);
607 dev->dma = bus_info & 0x07;
608 dev->irq = (bus_info >> 4) & 0x0F;
609 } else {
610 /* The DMA channel may be passed in PARAM1. */
611 if (dev->mem_start & 0x07)
612 dev->dma = dev->mem_start & 0x07;
613 }
614
615 if (dev->dma == 0) {
616 /* Read the DMA channel status register, so that we can avoid
617 stuck DMA channels in the DMA detection below. */
618 dma_channels = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
619 (inb(DMA2_STAT_REG) & 0xf0);
620 }
621 err = -ENODEV;
622 if (dev->irq >= 2)
623 printk(" assigned IRQ %d", dev->irq);
624 else if (lance_version != 0) { /* 7990 boards need DMA detection first. */
625 unsigned long irq_mask;
626
627 /* To auto-IRQ we enable the initialization-done and DMA error
628 interrupts. For ISA boards we get a DMA error, but VLB and PCI
629 boards will work. */
630 irq_mask = probe_irq_on();
631
632 /* Trigger an initialization just for the interrupt. */
633 outw(0x0041, ioaddr+LANCE_DATA);
634
635 mdelay(20);
636 dev->irq = probe_irq_off(irq_mask);
637 if (dev->irq)
638 printk(", probed IRQ %d", dev->irq);
639 else {
640 printk(", failed to detect IRQ line.\n");
641 goto out_tx;
642 }
643
644 /* Check for the initialization done bit, 0x0100, which means
645 that we don't need a DMA channel. */
646 if (inw(ioaddr+LANCE_DATA) & 0x0100)
647 dev->dma = 4;
648 }
649
650 if (dev->dma == 4) {
651 printk(", no DMA needed.\n");
652 } else if (dev->dma) {
653 if (request_dma(dev->dma, chipname)) {
654 printk("DMA %d allocation failed.\n", dev->dma);
655 goto out_tx;
656 } else
657 printk(", assigned DMA %d.\n", dev->dma);
658 } else { /* OK, we have to auto-DMA. */
659 for (i = 0; i < 4; i++) {
660 static const char dmas[] = { 5, 6, 7, 3 };
661 int dma = dmas[i];
662 int boguscnt;
663
664 /* Don't enable a permanently busy DMA channel, or the machine
665 will hang. */
666 if (test_bit(dma, &dma_channels))
667 continue;
668 outw(0x7f04, ioaddr+LANCE_DATA); /* Clear the memory error bits. */
669 if (request_dma(dma, chipname))
670 continue;
671
672 flags=claim_dma_lock();
673 set_dma_mode(dma, DMA_MODE_CASCADE);
674 enable_dma(dma);
675 release_dma_lock(flags);
676
677 /* Trigger an initialization. */
678 outw(0x0001, ioaddr+LANCE_DATA);
679 for (boguscnt = 100; boguscnt > 0; --boguscnt)
680 if (inw(ioaddr+LANCE_DATA) & 0x0900)
681 break;
682 if (inw(ioaddr+LANCE_DATA) & 0x0100) {
683 dev->dma = dma;
684 printk(", DMA %d.\n", dev->dma);
685 break;
686 } else {
687 flags=claim_dma_lock();
688 disable_dma(dma);
689 release_dma_lock(flags);
690 free_dma(dma);
691 }
692 }
693 if (i == 4) { /* Failure: bail. */
694 printk("DMA detection failed.\n");
695 goto out_tx;
696 }
697 }
698
699 if (lance_version == 0 && dev->irq == 0) {
700 /* We may auto-IRQ now that we have a DMA channel. */
701 /* Trigger an initialization just for the interrupt. */
702 unsigned long irq_mask;
703
704 irq_mask = probe_irq_on();
705 outw(0x0041, ioaddr+LANCE_DATA);
706
707 mdelay(40);
708 dev->irq = probe_irq_off(irq_mask);
709 if (dev->irq == 0) {
710 printk(" Failed to detect the 7990 IRQ line.\n");
711 goto out_dma;
712 }
713 printk(" Auto-IRQ detected IRQ%d.\n", dev->irq);
714 }
715
716 if (chip_table[lp->chip_version].flags & LANCE_ENABLE_AUTOSELECT) {
717 /* Turn on auto-select of media (10baseT or BNC) so that the user
718 can watch the LEDs even if the board isn't opened. */
719 outw(0x0002, ioaddr+LANCE_ADDR);
720 /* Don't touch 10base2 power bit. */
721 outw(inw(ioaddr+LANCE_BUS_IF) | 0x0002, ioaddr+LANCE_BUS_IF);
722 }
723
724 if (lance_debug > 0 && did_version++ == 0)
725 printk(version);
726
727 /* The LANCE-specific entries in the device structure. */
728 dev->netdev_ops = &lance_netdev_ops;
729 dev->watchdog_timeo = TX_TIMEOUT;
730
731 err = register_netdev(dev);
732 if (err)
733 goto out_dma;
734 return 0;
735 out_dma:
736 if (dev->dma != 4)
737 free_dma(dev->dma);
738 out_tx:
739 kfree(lp->tx_bounce_buffs);
740 out_rx:
741 kfree((void*)lp->rx_buffs);
742 out_lp:
743 kfree(lp);
744 return err;
745 }
746
747
748 static int
lance_open(struct net_device * dev)749 lance_open(struct net_device *dev)
750 {
751 struct lance_private *lp = dev->ml_priv;
752 int ioaddr = dev->base_addr;
753 int i;
754
755 if (dev->irq == 0 ||
756 request_irq(dev->irq, lance_interrupt, 0, dev->name, dev)) {
757 return -EAGAIN;
758 }
759
760 /* We used to allocate DMA here, but that was silly.
761 DMA lines can't be shared! We now permanently allocate them. */
762
763 /* Reset the LANCE */
764 inw(ioaddr+LANCE_RESET);
765
766 /* The DMA controller is used as a no-operation slave, "cascade mode". */
767 if (dev->dma != 4) {
768 unsigned long flags=claim_dma_lock();
769 enable_dma(dev->dma);
770 set_dma_mode(dev->dma, DMA_MODE_CASCADE);
771 release_dma_lock(flags);
772 }
773
774 /* Un-Reset the LANCE, needed only for the NE2100. */
775 if (chip_table[lp->chip_version].flags & LANCE_MUST_UNRESET)
776 outw(0, ioaddr+LANCE_RESET);
777
778 if (chip_table[lp->chip_version].flags & LANCE_ENABLE_AUTOSELECT) {
779 /* This is 79C960-specific: Turn on auto-select of media (AUI, BNC). */
780 outw(0x0002, ioaddr+LANCE_ADDR);
781 /* Only touch autoselect bit. */
782 outw(inw(ioaddr+LANCE_BUS_IF) | 0x0002, ioaddr+LANCE_BUS_IF);
783 }
784
785 if (lance_debug > 1)
786 printk("%s: lance_open() irq %d dma %d tx/rx rings %#x/%#x init %#x.\n",
787 dev->name, dev->irq, dev->dma,
788 (u32) isa_virt_to_bus(lp->tx_ring),
789 (u32) isa_virt_to_bus(lp->rx_ring),
790 (u32) isa_virt_to_bus(&lp->init_block));
791
792 lance_init_ring(dev, GFP_KERNEL);
793 /* Re-initialize the LANCE, and start it when done. */
794 outw(0x0001, ioaddr+LANCE_ADDR);
795 outw((short) (u32) isa_virt_to_bus(&lp->init_block), ioaddr+LANCE_DATA);
796 outw(0x0002, ioaddr+LANCE_ADDR);
797 outw(((u32)isa_virt_to_bus(&lp->init_block)) >> 16, ioaddr+LANCE_DATA);
798
799 outw(0x0004, ioaddr+LANCE_ADDR);
800 outw(0x0915, ioaddr+LANCE_DATA);
801
802 outw(0x0000, ioaddr+LANCE_ADDR);
803 outw(0x0001, ioaddr+LANCE_DATA);
804
805 netif_start_queue (dev);
806
807 i = 0;
808 while (i++ < 100)
809 if (inw(ioaddr+LANCE_DATA) & 0x0100)
810 break;
811 /*
812 * We used to clear the InitDone bit, 0x0100, here but Mark Stockton
813 * reports that doing so triggers a bug in the '974.
814 */
815 outw(0x0042, ioaddr+LANCE_DATA);
816
817 if (lance_debug > 2)
818 printk("%s: LANCE open after %d ticks, init block %#x csr0 %4.4x.\n",
819 dev->name, i, (u32) isa_virt_to_bus(&lp->init_block), inw(ioaddr+LANCE_DATA));
820
821 return 0; /* Always succeed */
822 }
823
824 /* The LANCE has been halted for one reason or another (busmaster memory
825 arbitration error, Tx FIFO underflow, driver stopped it to reconfigure,
826 etc.). Modern LANCE variants always reload their ring-buffer
827 configuration when restarted, so we must reinitialize our ring
828 context before restarting. As part of this reinitialization,
829 find all packets still on the Tx ring and pretend that they had been
830 sent (in effect, drop the packets on the floor) - the higher-level
831 protocols will time out and retransmit. It'd be better to shuffle
832 these skbs to a temp list and then actually re-Tx them after
833 restarting the chip, but I'm too lazy to do so right now. dplatt@3do.com
834 */
835
836 static void
lance_purge_ring(struct net_device * dev)837 lance_purge_ring(struct net_device *dev)
838 {
839 struct lance_private *lp = dev->ml_priv;
840 int i;
841
842 /* Free all the skbuffs in the Rx and Tx queues. */
843 for (i = 0; i < RX_RING_SIZE; i++) {
844 struct sk_buff *skb = lp->rx_skbuff[i];
845 lp->rx_skbuff[i] = NULL;
846 lp->rx_ring[i].base = 0; /* Not owned by LANCE chip. */
847 if (skb)
848 dev_kfree_skb_any(skb);
849 }
850 for (i = 0; i < TX_RING_SIZE; i++) {
851 if (lp->tx_skbuff[i]) {
852 dev_kfree_skb_any(lp->tx_skbuff[i]);
853 lp->tx_skbuff[i] = NULL;
854 }
855 }
856 }
857
858
859 /* Initialize the LANCE Rx and Tx rings. */
860 static void
lance_init_ring(struct net_device * dev,gfp_t gfp)861 lance_init_ring(struct net_device *dev, gfp_t gfp)
862 {
863 struct lance_private *lp = dev->ml_priv;
864 int i;
865
866 lp->cur_rx = lp->cur_tx = 0;
867 lp->dirty_rx = lp->dirty_tx = 0;
868
869 for (i = 0; i < RX_RING_SIZE; i++) {
870 struct sk_buff *skb;
871 void *rx_buff;
872
873 skb = alloc_skb(PKT_BUF_SZ, GFP_DMA | gfp);
874 lp->rx_skbuff[i] = skb;
875 if (skb)
876 rx_buff = skb->data;
877 else
878 rx_buff = kmalloc(PKT_BUF_SZ, GFP_DMA | gfp);
879 if (rx_buff == NULL)
880 lp->rx_ring[i].base = 0;
881 else
882 lp->rx_ring[i].base = (u32)isa_virt_to_bus(rx_buff) | 0x80000000;
883 lp->rx_ring[i].buf_length = -PKT_BUF_SZ;
884 }
885 /* The Tx buffer address is filled in as needed, but we do need to clear
886 the upper ownership bit. */
887 for (i = 0; i < TX_RING_SIZE; i++) {
888 lp->tx_skbuff[i] = NULL;
889 lp->tx_ring[i].base = 0;
890 }
891
892 lp->init_block.mode = 0x0000;
893 for (i = 0; i < 6; i++)
894 lp->init_block.phys_addr[i] = dev->dev_addr[i];
895 lp->init_block.filter[0] = 0x00000000;
896 lp->init_block.filter[1] = 0x00000000;
897 lp->init_block.rx_ring = ((u32)isa_virt_to_bus(lp->rx_ring) & 0xffffff) | RX_RING_LEN_BITS;
898 lp->init_block.tx_ring = ((u32)isa_virt_to_bus(lp->tx_ring) & 0xffffff) | TX_RING_LEN_BITS;
899 }
900
901 static void
lance_restart(struct net_device * dev,unsigned int csr0_bits,int must_reinit)902 lance_restart(struct net_device *dev, unsigned int csr0_bits, int must_reinit)
903 {
904 struct lance_private *lp = dev->ml_priv;
905
906 if (must_reinit ||
907 (chip_table[lp->chip_version].flags & LANCE_MUST_REINIT_RING)) {
908 lance_purge_ring(dev);
909 lance_init_ring(dev, GFP_ATOMIC);
910 }
911 outw(0x0000, dev->base_addr + LANCE_ADDR);
912 outw(csr0_bits, dev->base_addr + LANCE_DATA);
913 }
914
915
lance_tx_timeout(struct net_device * dev,unsigned int txqueue)916 static void lance_tx_timeout (struct net_device *dev, unsigned int txqueue)
917 {
918 struct lance_private *lp = (struct lance_private *) dev->ml_priv;
919 int ioaddr = dev->base_addr;
920
921 outw (0, ioaddr + LANCE_ADDR);
922 printk ("%s: transmit timed out, status %4.4x, resetting.\n",
923 dev->name, inw (ioaddr + LANCE_DATA));
924 outw (0x0004, ioaddr + LANCE_DATA);
925 dev->stats.tx_errors++;
926 #ifndef final_version
927 if (lance_debug > 3) {
928 int i;
929 printk (" Ring data dump: dirty_tx %d cur_tx %d%s cur_rx %d.",
930 lp->dirty_tx, lp->cur_tx, netif_queue_stopped(dev) ? " (full)" : "",
931 lp->cur_rx);
932 for (i = 0; i < RX_RING_SIZE; i++)
933 printk ("%s %08x %04x %04x", i & 0x3 ? "" : "\n ",
934 lp->rx_ring[i].base, -lp->rx_ring[i].buf_length,
935 lp->rx_ring[i].msg_length);
936 for (i = 0; i < TX_RING_SIZE; i++)
937 printk ("%s %08x %04x %04x", i & 0x3 ? "" : "\n ",
938 lp->tx_ring[i].base, -lp->tx_ring[i].length,
939 lp->tx_ring[i].misc);
940 printk ("\n");
941 }
942 #endif
943 lance_restart (dev, 0x0043, 1);
944
945 netif_trans_update(dev); /* prevent tx timeout */
946 netif_wake_queue (dev);
947 }
948
949
lance_start_xmit(struct sk_buff * skb,struct net_device * dev)950 static netdev_tx_t lance_start_xmit(struct sk_buff *skb,
951 struct net_device *dev)
952 {
953 struct lance_private *lp = dev->ml_priv;
954 int ioaddr = dev->base_addr;
955 int entry;
956 unsigned long flags;
957
958 spin_lock_irqsave(&lp->devlock, flags);
959
960 if (lance_debug > 3) {
961 outw(0x0000, ioaddr+LANCE_ADDR);
962 printk("%s: lance_start_xmit() called, csr0 %4.4x.\n", dev->name,
963 inw(ioaddr+LANCE_DATA));
964 outw(0x0000, ioaddr+LANCE_DATA);
965 }
966
967 /* Fill in a Tx ring entry */
968
969 /* Mask to ring buffer boundary. */
970 entry = lp->cur_tx & TX_RING_MOD_MASK;
971
972 /* Caution: the write order is important here, set the base address
973 with the "ownership" bits last. */
974
975 /* The old LANCE chips doesn't automatically pad buffers to min. size. */
976 if (chip_table[lp->chip_version].flags & LANCE_MUST_PAD) {
977 if (skb->len < ETH_ZLEN) {
978 if (skb_padto(skb, ETH_ZLEN))
979 goto out;
980 lp->tx_ring[entry].length = -ETH_ZLEN;
981 }
982 else
983 lp->tx_ring[entry].length = -skb->len;
984 } else
985 lp->tx_ring[entry].length = -skb->len;
986
987 lp->tx_ring[entry].misc = 0x0000;
988
989 dev->stats.tx_bytes += skb->len;
990
991 /* If any part of this buffer is >16M we must copy it to a low-memory
992 buffer. */
993 if ((u32)isa_virt_to_bus(skb->data) + skb->len > 0x01000000) {
994 if (lance_debug > 5)
995 printk("%s: bouncing a high-memory packet (%#x).\n",
996 dev->name, (u32)isa_virt_to_bus(skb->data));
997 skb_copy_from_linear_data(skb, &lp->tx_bounce_buffs[entry], skb->len);
998 lp->tx_ring[entry].base =
999 ((u32)isa_virt_to_bus((lp->tx_bounce_buffs + entry)) & 0xffffff) | 0x83000000;
1000 dev_consume_skb_irq(skb);
1001 } else {
1002 lp->tx_skbuff[entry] = skb;
1003 lp->tx_ring[entry].base = ((u32)isa_virt_to_bus(skb->data) & 0xffffff) | 0x83000000;
1004 }
1005 lp->cur_tx++;
1006
1007 /* Trigger an immediate send poll. */
1008 outw(0x0000, ioaddr+LANCE_ADDR);
1009 outw(0x0048, ioaddr+LANCE_DATA);
1010
1011 if ((lp->cur_tx - lp->dirty_tx) >= TX_RING_SIZE)
1012 netif_stop_queue(dev);
1013
1014 out:
1015 spin_unlock_irqrestore(&lp->devlock, flags);
1016 return NETDEV_TX_OK;
1017 }
1018
1019 /* The LANCE interrupt handler. */
lance_interrupt(int irq,void * dev_id)1020 static irqreturn_t lance_interrupt(int irq, void *dev_id)
1021 {
1022 struct net_device *dev = dev_id;
1023 struct lance_private *lp;
1024 int csr0, ioaddr, boguscnt=10;
1025 int must_restart;
1026
1027 ioaddr = dev->base_addr;
1028 lp = dev->ml_priv;
1029
1030 spin_lock (&lp->devlock);
1031
1032 outw(0x00, dev->base_addr + LANCE_ADDR);
1033 while ((csr0 = inw(dev->base_addr + LANCE_DATA)) & 0x8600 &&
1034 --boguscnt >= 0) {
1035 /* Acknowledge all of the current interrupt sources ASAP. */
1036 outw(csr0 & ~0x004f, dev->base_addr + LANCE_DATA);
1037
1038 must_restart = 0;
1039
1040 if (lance_debug > 5)
1041 printk("%s: interrupt csr0=%#2.2x new csr=%#2.2x.\n",
1042 dev->name, csr0, inw(dev->base_addr + LANCE_DATA));
1043
1044 if (csr0 & 0x0400) /* Rx interrupt */
1045 lance_rx(dev);
1046
1047 if (csr0 & 0x0200) { /* Tx-done interrupt */
1048 int dirty_tx = lp->dirty_tx;
1049
1050 while (dirty_tx < lp->cur_tx) {
1051 int entry = dirty_tx & TX_RING_MOD_MASK;
1052 int status = lp->tx_ring[entry].base;
1053
1054 if (status < 0)
1055 break; /* It still hasn't been Txed */
1056
1057 lp->tx_ring[entry].base = 0;
1058
1059 if (status & 0x40000000) {
1060 /* There was an major error, log it. */
1061 int err_status = lp->tx_ring[entry].misc;
1062 dev->stats.tx_errors++;
1063 if (err_status & 0x0400)
1064 dev->stats.tx_aborted_errors++;
1065 if (err_status & 0x0800)
1066 dev->stats.tx_carrier_errors++;
1067 if (err_status & 0x1000)
1068 dev->stats.tx_window_errors++;
1069 if (err_status & 0x4000) {
1070 /* Ackk! On FIFO errors the Tx unit is turned off! */
1071 dev->stats.tx_fifo_errors++;
1072 /* Remove this verbosity later! */
1073 printk("%s: Tx FIFO error! Status %4.4x.\n",
1074 dev->name, csr0);
1075 /* Restart the chip. */
1076 must_restart = 1;
1077 }
1078 } else {
1079 if (status & 0x18000000)
1080 dev->stats.collisions++;
1081 dev->stats.tx_packets++;
1082 }
1083
1084 /* We must free the original skb if it's not a data-only copy
1085 in the bounce buffer. */
1086 if (lp->tx_skbuff[entry]) {
1087 dev_consume_skb_irq(lp->tx_skbuff[entry]);
1088 lp->tx_skbuff[entry] = NULL;
1089 }
1090 dirty_tx++;
1091 }
1092
1093 #ifndef final_version
1094 if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) {
1095 printk("out-of-sync dirty pointer, %d vs. %d, full=%s.\n",
1096 dirty_tx, lp->cur_tx,
1097 netif_queue_stopped(dev) ? "yes" : "no");
1098 dirty_tx += TX_RING_SIZE;
1099 }
1100 #endif
1101
1102 /* if the ring is no longer full, accept more packets */
1103 if (netif_queue_stopped(dev) &&
1104 dirty_tx > lp->cur_tx - TX_RING_SIZE + 2)
1105 netif_wake_queue (dev);
1106
1107 lp->dirty_tx = dirty_tx;
1108 }
1109
1110 /* Log misc errors. */
1111 if (csr0 & 0x4000)
1112 dev->stats.tx_errors++; /* Tx babble. */
1113 if (csr0 & 0x1000)
1114 dev->stats.rx_errors++; /* Missed a Rx frame. */
1115 if (csr0 & 0x0800) {
1116 printk("%s: Bus master arbitration failure, status %4.4x.\n",
1117 dev->name, csr0);
1118 /* Restart the chip. */
1119 must_restart = 1;
1120 }
1121
1122 if (must_restart) {
1123 /* stop the chip to clear the error condition, then restart */
1124 outw(0x0000, dev->base_addr + LANCE_ADDR);
1125 outw(0x0004, dev->base_addr + LANCE_DATA);
1126 lance_restart(dev, 0x0002, 0);
1127 }
1128 }
1129
1130 /* Clear any other interrupt, and set interrupt enable. */
1131 outw(0x0000, dev->base_addr + LANCE_ADDR);
1132 outw(0x7940, dev->base_addr + LANCE_DATA);
1133
1134 if (lance_debug > 4)
1135 printk("%s: exiting interrupt, csr%d=%#4.4x.\n",
1136 dev->name, inw(ioaddr + LANCE_ADDR),
1137 inw(dev->base_addr + LANCE_DATA));
1138
1139 spin_unlock (&lp->devlock);
1140 return IRQ_HANDLED;
1141 }
1142
1143 static int
lance_rx(struct net_device * dev)1144 lance_rx(struct net_device *dev)
1145 {
1146 struct lance_private *lp = dev->ml_priv;
1147 int entry = lp->cur_rx & RX_RING_MOD_MASK;
1148 int i;
1149
1150 /* If we own the next entry, it's a new packet. Send it up. */
1151 while (lp->rx_ring[entry].base >= 0) {
1152 int status = lp->rx_ring[entry].base >> 24;
1153
1154 if (status != 0x03) { /* There was an error. */
1155 /* There is a tricky error noted by John Murphy,
1156 <murf@perftech.com> to Russ Nelson: Even with full-sized
1157 buffers it's possible for a jabber packet to use two
1158 buffers, with only the last correctly noting the error. */
1159 if (status & 0x01) /* Only count a general error at the */
1160 dev->stats.rx_errors++; /* end of a packet.*/
1161 if (status & 0x20)
1162 dev->stats.rx_frame_errors++;
1163 if (status & 0x10)
1164 dev->stats.rx_over_errors++;
1165 if (status & 0x08)
1166 dev->stats.rx_crc_errors++;
1167 if (status & 0x04)
1168 dev->stats.rx_fifo_errors++;
1169 lp->rx_ring[entry].base &= 0x03ffffff;
1170 }
1171 else
1172 {
1173 /* Malloc up new buffer, compatible with net3. */
1174 short pkt_len = (lp->rx_ring[entry].msg_length & 0xfff)-4;
1175 struct sk_buff *skb;
1176
1177 if(pkt_len<60)
1178 {
1179 printk("%s: Runt packet!\n",dev->name);
1180 dev->stats.rx_errors++;
1181 }
1182 else
1183 {
1184 skb = dev_alloc_skb(pkt_len+2);
1185 if (skb == NULL)
1186 {
1187 printk("%s: Memory squeeze, deferring packet.\n", dev->name);
1188 for (i=0; i < RX_RING_SIZE; i++)
1189 if (lp->rx_ring[(entry+i) & RX_RING_MOD_MASK].base < 0)
1190 break;
1191
1192 if (i > RX_RING_SIZE -2)
1193 {
1194 dev->stats.rx_dropped++;
1195 lp->rx_ring[entry].base |= 0x80000000;
1196 lp->cur_rx++;
1197 }
1198 break;
1199 }
1200 skb_reserve(skb,2); /* 16 byte align */
1201 skb_put(skb,pkt_len); /* Make room */
1202 skb_copy_to_linear_data(skb,
1203 (unsigned char *)isa_bus_to_virt((lp->rx_ring[entry].base & 0x00ffffff)),
1204 pkt_len);
1205 skb->protocol=eth_type_trans(skb,dev);
1206 netif_rx(skb);
1207 dev->stats.rx_packets++;
1208 dev->stats.rx_bytes += pkt_len;
1209 }
1210 }
1211 /* The docs say that the buffer length isn't touched, but Andrew Boyd
1212 of QNX reports that some revs of the 79C965 clear it. */
1213 lp->rx_ring[entry].buf_length = -PKT_BUF_SZ;
1214 lp->rx_ring[entry].base |= 0x80000000;
1215 entry = (++lp->cur_rx) & RX_RING_MOD_MASK;
1216 }
1217
1218 /* We should check that at least two ring entries are free. If not,
1219 we should free one and mark stats->rx_dropped++. */
1220
1221 return 0;
1222 }
1223
1224 static int
lance_close(struct net_device * dev)1225 lance_close(struct net_device *dev)
1226 {
1227 int ioaddr = dev->base_addr;
1228 struct lance_private *lp = dev->ml_priv;
1229
1230 netif_stop_queue (dev);
1231
1232 if (chip_table[lp->chip_version].flags & LANCE_HAS_MISSED_FRAME) {
1233 outw(112, ioaddr+LANCE_ADDR);
1234 dev->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA);
1235 }
1236 outw(0, ioaddr+LANCE_ADDR);
1237
1238 if (lance_debug > 1)
1239 printk("%s: Shutting down ethercard, status was %2.2x.\n",
1240 dev->name, inw(ioaddr+LANCE_DATA));
1241
1242 /* We stop the LANCE here -- it occasionally polls
1243 memory if we don't. */
1244 outw(0x0004, ioaddr+LANCE_DATA);
1245
1246 if (dev->dma != 4)
1247 {
1248 unsigned long flags=claim_dma_lock();
1249 disable_dma(dev->dma);
1250 release_dma_lock(flags);
1251 }
1252 free_irq(dev->irq, dev);
1253
1254 lance_purge_ring(dev);
1255
1256 return 0;
1257 }
1258
lance_get_stats(struct net_device * dev)1259 static struct net_device_stats *lance_get_stats(struct net_device *dev)
1260 {
1261 struct lance_private *lp = dev->ml_priv;
1262
1263 if (chip_table[lp->chip_version].flags & LANCE_HAS_MISSED_FRAME) {
1264 short ioaddr = dev->base_addr;
1265 short saved_addr;
1266 unsigned long flags;
1267
1268 spin_lock_irqsave(&lp->devlock, flags);
1269 saved_addr = inw(ioaddr+LANCE_ADDR);
1270 outw(112, ioaddr+LANCE_ADDR);
1271 dev->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA);
1272 outw(saved_addr, ioaddr+LANCE_ADDR);
1273 spin_unlock_irqrestore(&lp->devlock, flags);
1274 }
1275
1276 return &dev->stats;
1277 }
1278
1279 /* Set or clear the multicast filter for this adaptor.
1280 */
1281
set_multicast_list(struct net_device * dev)1282 static void set_multicast_list(struct net_device *dev)
1283 {
1284 short ioaddr = dev->base_addr;
1285
1286 outw(0, ioaddr+LANCE_ADDR);
1287 outw(0x0004, ioaddr+LANCE_DATA); /* Temporarily stop the lance. */
1288
1289 if (dev->flags&IFF_PROMISC) {
1290 outw(15, ioaddr+LANCE_ADDR);
1291 outw(0x8000, ioaddr+LANCE_DATA); /* Set promiscuous mode */
1292 } else {
1293 short multicast_table[4];
1294 int i;
1295 int num_addrs=netdev_mc_count(dev);
1296 if(dev->flags&IFF_ALLMULTI)
1297 num_addrs=1;
1298 /* FIXIT: We don't use the multicast table, but rely on upper-layer filtering. */
1299 memset(multicast_table, (num_addrs == 0) ? 0 : -1, sizeof(multicast_table));
1300 for (i = 0; i < 4; i++) {
1301 outw(8 + i, ioaddr+LANCE_ADDR);
1302 outw(multicast_table[i], ioaddr+LANCE_DATA);
1303 }
1304 outw(15, ioaddr+LANCE_ADDR);
1305 outw(0x0000, ioaddr+LANCE_DATA); /* Unset promiscuous mode */
1306 }
1307
1308 lance_restart(dev, 0x0142, 0); /* Resume normal operation */
1309
1310 }
1311
1312