x86/amd-iommu: Add per IOMMU reference counting
[linux/fpc-iii.git] / drivers / net / lance.c
blobdcda30338b65bfb9d9fb70930b5d0e4d266c8849
1 /* lance.c: An AMD LANCE/PCnet ethernet driver for Linux. */
2 /*
3 Written/copyright 1993-1998 by Donald Becker.
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.
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.
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
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>
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
38 Get rid of check_region, check kmalloc return in lance_probe1
39 Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 11/01/2001
41 Reworked detection, added support for Racal InterLan EtherBlaster cards
42 Vesselin Kostadinov <vesok at yahoo dot com > - 22/4/2004
45 static const char version[] = "lance.c:v1.16 2006/11/09 dplatt@3do.com, becker@cesdis.gsfc.nasa.gov\n";
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>
63 #include <asm/io.h>
64 #include <asm/dma.h>
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);
71 static struct card {
72 char id_offset14;
73 char id_offset15;
74 } cards[] = {
75 { //"normal"
76 .id_offset14 = 0x57,
77 .id_offset15 = 0x57,
79 { //NI6510EB
80 .id_offset14 = 0x52,
81 .id_offset15 = 0x44,
83 { //Racal InterLan EtherBlaster
84 .id_offset14 = 0x52,
85 .id_offset15 = 0x49,
88 #define NUM_CARDS 3
90 #ifdef LANCE_DEBUG
91 static int lance_debug = LANCE_DEBUG;
92 #else
93 static int lance_debug = 1;
94 #endif
97 Theory of Operation
99 I. Board Compatibility
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.
109 II. Board-specific settings
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.)
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.
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.)
128 III. Driver operation
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.)
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.
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.
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.
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.
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.
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.
188 #ifndef LANCE_LOG_TX_BUFFERS
189 #define LANCE_LOG_TX_BUFFERS 4
190 #define LANCE_LOG_RX_BUFFERS 4
191 #endif
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)
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)
201 #define PKT_BUF_SZ 1544
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
210 #define TX_TIMEOUT 20
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". */
219 struct lance_tx_head {
220 s32 base;
221 s16 length; /* Length is 2s complement (negative)! */
222 s16 misc;
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;
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 struct net_device_stats stats;
252 unsigned char chip_version; /* See lance_chip_type. */
253 spinlock_t devlock;
256 #define LANCE_MUST_PAD 0x00000001
257 #define LANCE_ENABLE_AUTOSELECT 0x00000002
258 #define LANCE_MUST_REINIT_RING 0x00000004
259 #define LANCE_MUST_UNRESET 0x00000008
260 #define LANCE_HAS_MISSED_FRAME 0x00000010
262 /* A mapping from the chip ID number to the part number and features.
263 These are from the datasheets -- in real life the '970 version
264 reportedly has the same ID as the '965. */
265 static struct lance_chip_type {
266 int id_number;
267 const char *name;
268 int flags;
269 } chip_table[] = {
270 {0x0000, "LANCE 7990", /* Ancient lance chip. */
271 LANCE_MUST_PAD + LANCE_MUST_UNRESET},
272 {0x0003, "PCnet/ISA 79C960", /* 79C960 PCnet/ISA. */
273 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
274 LANCE_HAS_MISSED_FRAME},
275 {0x2260, "PCnet/ISA+ 79C961", /* 79C961 PCnet/ISA+, Plug-n-Play. */
276 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
277 LANCE_HAS_MISSED_FRAME},
278 {0x2420, "PCnet/PCI 79C970", /* 79C970 or 79C974 PCnet-SCSI, PCI. */
279 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
280 LANCE_HAS_MISSED_FRAME},
281 /* Bug: the PCnet/PCI actually uses the PCnet/VLB ID number, so just call
282 it the PCnet32. */
283 {0x2430, "PCnet32", /* 79C965 PCnet for VL bus. */
284 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
285 LANCE_HAS_MISSED_FRAME},
286 {0x2621, "PCnet/PCI-II 79C970A", /* 79C970A PCInetPCI II. */
287 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
288 LANCE_HAS_MISSED_FRAME},
289 {0x0, "PCnet (unknown)",
290 LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING +
291 LANCE_HAS_MISSED_FRAME},
294 enum {OLD_LANCE = 0, PCNET_ISA=1, PCNET_ISAP=2, PCNET_PCI=3, PCNET_VLB=4, PCNET_PCI_II=5, LANCE_UNKNOWN=6};
297 /* Non-zero if lance_probe1() needs to allocate low-memory bounce buffers.
298 Assume yes until we know the memory size. */
299 static unsigned char lance_need_isa_bounce_buffers = 1;
301 static int lance_open(struct net_device *dev);
302 static void lance_init_ring(struct net_device *dev, gfp_t mode);
303 static netdev_tx_t lance_start_xmit(struct sk_buff *skb,
304 struct net_device *dev);
305 static int lance_rx(struct net_device *dev);
306 static irqreturn_t lance_interrupt(int irq, void *dev_id);
307 static int lance_close(struct net_device *dev);
308 static struct net_device_stats *lance_get_stats(struct net_device *dev);
309 static void set_multicast_list(struct net_device *dev);
310 static void lance_tx_timeout (struct net_device *dev);
314 #ifdef MODULE
315 #define MAX_CARDS 8 /* Max number of interfaces (cards) per module */
317 static struct net_device *dev_lance[MAX_CARDS];
318 static int io[MAX_CARDS];
319 static int dma[MAX_CARDS];
320 static int irq[MAX_CARDS];
322 module_param_array(io, int, NULL, 0);
323 module_param_array(dma, int, NULL, 0);
324 module_param_array(irq, int, NULL, 0);
325 module_param(lance_debug, int, 0);
326 MODULE_PARM_DESC(io, "LANCE/PCnet I/O base address(es),required");
327 MODULE_PARM_DESC(dma, "LANCE/PCnet ISA DMA channel (ignored for some devices)");
328 MODULE_PARM_DESC(irq, "LANCE/PCnet IRQ number (ignored for some devices)");
329 MODULE_PARM_DESC(lance_debug, "LANCE/PCnet debug level (0-7)");
331 int __init init_module(void)
333 struct net_device *dev;
334 int this_dev, found = 0;
336 for (this_dev = 0; this_dev < MAX_CARDS; this_dev++) {
337 if (io[this_dev] == 0) {
338 if (this_dev != 0) /* only complain once */
339 break;
340 printk(KERN_NOTICE "lance.c: Module autoprobing not allowed. Append \"io=0xNNN\" value(s).\n");
341 return -EPERM;
343 dev = alloc_etherdev(0);
344 if (!dev)
345 break;
346 dev->irq = irq[this_dev];
347 dev->base_addr = io[this_dev];
348 dev->dma = dma[this_dev];
349 if (do_lance_probe(dev) == 0) {
350 dev_lance[found++] = dev;
351 continue;
353 free_netdev(dev);
354 break;
356 if (found != 0)
357 return 0;
358 return -ENXIO;
361 static void cleanup_card(struct net_device *dev)
363 struct lance_private *lp = dev->ml_priv;
364 if (dev->dma != 4)
365 free_dma(dev->dma);
366 release_region(dev->base_addr, LANCE_TOTAL_SIZE);
367 kfree(lp->tx_bounce_buffs);
368 kfree((void*)lp->rx_buffs);
369 kfree(lp);
372 void __exit cleanup_module(void)
374 int this_dev;
376 for (this_dev = 0; this_dev < MAX_CARDS; this_dev++) {
377 struct net_device *dev = dev_lance[this_dev];
378 if (dev) {
379 unregister_netdev(dev);
380 cleanup_card(dev);
381 free_netdev(dev);
385 #endif /* MODULE */
386 MODULE_LICENSE("GPL");
389 /* Starting in v2.1.*, the LANCE/PCnet probe is now similar to the other
390 board probes now that kmalloc() can allocate ISA DMA-able regions.
391 This also allows the LANCE driver to be used as a module.
393 static int __init do_lance_probe(struct net_device *dev)
395 unsigned int *port;
396 int result;
398 if (high_memory <= phys_to_virt(16*1024*1024))
399 lance_need_isa_bounce_buffers = 0;
401 for (port = lance_portlist; *port; port++) {
402 int ioaddr = *port;
403 struct resource *r = request_region(ioaddr, LANCE_TOTAL_SIZE,
404 "lance-probe");
406 if (r) {
407 /* Detect the card with minimal I/O reads */
408 char offset14 = inb(ioaddr + 14);
409 int card;
410 for (card = 0; card < NUM_CARDS; ++card)
411 if (cards[card].id_offset14 == offset14)
412 break;
413 if (card < NUM_CARDS) {/*yes, the first byte matches*/
414 char offset15 = inb(ioaddr + 15);
415 for (card = 0; card < NUM_CARDS; ++card)
416 if ((cards[card].id_offset14 == offset14) &&
417 (cards[card].id_offset15 == offset15))
418 break;
420 if (card < NUM_CARDS) { /*Signature OK*/
421 result = lance_probe1(dev, ioaddr, 0, 0);
422 if (!result) {
423 struct lance_private *lp = dev->ml_priv;
424 int ver = lp->chip_version;
426 r->name = chip_table[ver].name;
427 return 0;
430 release_region(ioaddr, LANCE_TOTAL_SIZE);
433 return -ENODEV;
436 #ifndef MODULE
437 struct net_device * __init lance_probe(int unit)
439 struct net_device *dev = alloc_etherdev(0);
440 int err;
442 if (!dev)
443 return ERR_PTR(-ENODEV);
445 sprintf(dev->name, "eth%d", unit);
446 netdev_boot_setup_check(dev);
448 err = do_lance_probe(dev);
449 if (err)
450 goto out;
451 return dev;
452 out:
453 free_netdev(dev);
454 return ERR_PTR(err);
456 #endif
458 static const struct net_device_ops lance_netdev_ops = {
459 .ndo_open = lance_open,
460 .ndo_start_xmit = lance_start_xmit,
461 .ndo_stop = lance_close,
462 .ndo_get_stats = lance_get_stats,
463 .ndo_set_multicast_list = set_multicast_list,
464 .ndo_tx_timeout = lance_tx_timeout,
465 .ndo_change_mtu = eth_change_mtu,
466 .ndo_set_mac_address = eth_mac_addr,
467 .ndo_validate_addr = eth_validate_addr,
470 static int __init lance_probe1(struct net_device *dev, int ioaddr, int irq, int options)
472 struct lance_private *lp;
473 unsigned long dma_channels; /* Mark spuriously-busy DMA channels */
474 int i, reset_val, lance_version;
475 const char *chipname;
476 /* Flags for specific chips or boards. */
477 unsigned char hpJ2405A = 0; /* HP ISA adaptor */
478 int hp_builtin = 0; /* HP on-board ethernet. */
479 static int did_version; /* Already printed version info. */
480 unsigned long flags;
481 int err = -ENOMEM;
482 void __iomem *bios;
484 /* First we look for special cases.
485 Check for HP's on-board ethernet by looking for 'HP' in the BIOS.
486 There are two HP versions, check the BIOS for the configuration port.
487 This method provided by L. Julliard, Laurent_Julliard@grenoble.hp.com.
489 bios = ioremap(0xf00f0, 0x14);
490 if (!bios)
491 return -ENOMEM;
492 if (readw(bios + 0x12) == 0x5048) {
493 static const short ioaddr_table[] = { 0x300, 0x320, 0x340, 0x360};
494 int hp_port = (readl(bios + 1) & 1) ? 0x499 : 0x99;
495 /* We can have boards other than the built-in! Verify this is on-board. */
496 if ((inb(hp_port) & 0xc0) == 0x80
497 && ioaddr_table[inb(hp_port) & 3] == ioaddr)
498 hp_builtin = hp_port;
500 iounmap(bios);
501 /* We also recognize the HP Vectra on-board here, but check below. */
502 hpJ2405A = (inb(ioaddr) == 0x08 && inb(ioaddr+1) == 0x00
503 && inb(ioaddr+2) == 0x09);
505 /* Reset the LANCE. */
506 reset_val = inw(ioaddr+LANCE_RESET); /* Reset the LANCE */
508 /* The Un-Reset needed is only needed for the real NE2100, and will
509 confuse the HP board. */
510 if (!hpJ2405A)
511 outw(reset_val, ioaddr+LANCE_RESET);
513 outw(0x0000, ioaddr+LANCE_ADDR); /* Switch to window 0 */
514 if (inw(ioaddr+LANCE_DATA) != 0x0004)
515 return -ENODEV;
517 /* Get the version of the chip. */
518 outw(88, ioaddr+LANCE_ADDR);
519 if (inw(ioaddr+LANCE_ADDR) != 88) {
520 lance_version = 0;
521 } else { /* Good, it's a newer chip. */
522 int chip_version = inw(ioaddr+LANCE_DATA);
523 outw(89, ioaddr+LANCE_ADDR);
524 chip_version |= inw(ioaddr+LANCE_DATA) << 16;
525 if (lance_debug > 2)
526 printk(" LANCE chip version is %#x.\n", chip_version);
527 if ((chip_version & 0xfff) != 0x003)
528 return -ENODEV;
529 chip_version = (chip_version >> 12) & 0xffff;
530 for (lance_version = 1; chip_table[lance_version].id_number; lance_version++) {
531 if (chip_table[lance_version].id_number == chip_version)
532 break;
536 /* We can't allocate private data from alloc_etherdev() because it must
537 a ISA DMA-able region. */
538 chipname = chip_table[lance_version].name;
539 printk("%s: %s at %#3x, ", dev->name, chipname, ioaddr);
541 /* There is a 16 byte station address PROM at the base address.
542 The first six bytes are the station address. */
543 for (i = 0; i < 6; i++)
544 dev->dev_addr[i] = inb(ioaddr + i);
545 printk("%pM", dev->dev_addr);
547 dev->base_addr = ioaddr;
548 /* Make certain the data structures used by the LANCE are aligned and DMAble. */
550 lp = kzalloc(sizeof(*lp), GFP_DMA | GFP_KERNEL);
551 if(lp==NULL)
552 return -ENODEV;
553 if (lance_debug > 6) printk(" (#0x%05lx)", (unsigned long)lp);
554 dev->ml_priv = lp;
555 lp->name = chipname;
556 lp->rx_buffs = (unsigned long)kmalloc(PKT_BUF_SZ*RX_RING_SIZE,
557 GFP_DMA | GFP_KERNEL);
558 if (!lp->rx_buffs)
559 goto out_lp;
560 if (lance_need_isa_bounce_buffers) {
561 lp->tx_bounce_buffs = kmalloc(PKT_BUF_SZ*TX_RING_SIZE,
562 GFP_DMA | GFP_KERNEL);
563 if (!lp->tx_bounce_buffs)
564 goto out_rx;
565 } else
566 lp->tx_bounce_buffs = NULL;
568 lp->chip_version = lance_version;
569 spin_lock_init(&lp->devlock);
571 lp->init_block.mode = 0x0003; /* Disable Rx and Tx. */
572 for (i = 0; i < 6; i++)
573 lp->init_block.phys_addr[i] = dev->dev_addr[i];
574 lp->init_block.filter[0] = 0x00000000;
575 lp->init_block.filter[1] = 0x00000000;
576 lp->init_block.rx_ring = ((u32)isa_virt_to_bus(lp->rx_ring) & 0xffffff) | RX_RING_LEN_BITS;
577 lp->init_block.tx_ring = ((u32)isa_virt_to_bus(lp->tx_ring) & 0xffffff) | TX_RING_LEN_BITS;
579 outw(0x0001, ioaddr+LANCE_ADDR);
580 inw(ioaddr+LANCE_ADDR);
581 outw((short) (u32) isa_virt_to_bus(&lp->init_block), ioaddr+LANCE_DATA);
582 outw(0x0002, ioaddr+LANCE_ADDR);
583 inw(ioaddr+LANCE_ADDR);
584 outw(((u32)isa_virt_to_bus(&lp->init_block)) >> 16, ioaddr+LANCE_DATA);
585 outw(0x0000, ioaddr+LANCE_ADDR);
586 inw(ioaddr+LANCE_ADDR);
588 if (irq) { /* Set iff PCI card. */
589 dev->dma = 4; /* Native bus-master, no DMA channel needed. */
590 dev->irq = irq;
591 } else if (hp_builtin) {
592 static const char dma_tbl[4] = {3, 5, 6, 0};
593 static const char irq_tbl[4] = {3, 4, 5, 9};
594 unsigned char port_val = inb(hp_builtin);
595 dev->dma = dma_tbl[(port_val >> 4) & 3];
596 dev->irq = irq_tbl[(port_val >> 2) & 3];
597 printk(" HP Vectra IRQ %d DMA %d.\n", dev->irq, dev->dma);
598 } else if (hpJ2405A) {
599 static const char dma_tbl[4] = {3, 5, 6, 7};
600 static const char irq_tbl[8] = {3, 4, 5, 9, 10, 11, 12, 15};
601 short reset_val = inw(ioaddr+LANCE_RESET);
602 dev->dma = dma_tbl[(reset_val >> 2) & 3];
603 dev->irq = irq_tbl[(reset_val >> 4) & 7];
604 printk(" HP J2405A IRQ %d DMA %d.\n", dev->irq, dev->dma);
605 } else if (lance_version == PCNET_ISAP) { /* The plug-n-play version. */
606 short bus_info;
607 outw(8, ioaddr+LANCE_ADDR);
608 bus_info = inw(ioaddr+LANCE_BUS_IF);
609 dev->dma = bus_info & 0x07;
610 dev->irq = (bus_info >> 4) & 0x0F;
611 } else {
612 /* The DMA channel may be passed in PARAM1. */
613 if (dev->mem_start & 0x07)
614 dev->dma = dev->mem_start & 0x07;
617 if (dev->dma == 0) {
618 /* Read the DMA channel status register, so that we can avoid
619 stuck DMA channels in the DMA detection below. */
620 dma_channels = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
621 (inb(DMA2_STAT_REG) & 0xf0);
623 err = -ENODEV;
624 if (dev->irq >= 2)
625 printk(" assigned IRQ %d", dev->irq);
626 else if (lance_version != 0) { /* 7990 boards need DMA detection first. */
627 unsigned long irq_mask;
629 /* To auto-IRQ we enable the initialization-done and DMA error
630 interrupts. For ISA boards we get a DMA error, but VLB and PCI
631 boards will work. */
632 irq_mask = probe_irq_on();
634 /* Trigger an initialization just for the interrupt. */
635 outw(0x0041, ioaddr+LANCE_DATA);
637 mdelay(20);
638 dev->irq = probe_irq_off(irq_mask);
639 if (dev->irq)
640 printk(", probed IRQ %d", dev->irq);
641 else {
642 printk(", failed to detect IRQ line.\n");
643 goto out_tx;
646 /* Check for the initialization done bit, 0x0100, which means
647 that we don't need a DMA channel. */
648 if (inw(ioaddr+LANCE_DATA) & 0x0100)
649 dev->dma = 4;
652 if (dev->dma == 4) {
653 printk(", no DMA needed.\n");
654 } else if (dev->dma) {
655 if (request_dma(dev->dma, chipname)) {
656 printk("DMA %d allocation failed.\n", dev->dma);
657 goto out_tx;
658 } else
659 printk(", assigned DMA %d.\n", dev->dma);
660 } else { /* OK, we have to auto-DMA. */
661 for (i = 0; i < 4; i++) {
662 static const char dmas[] = { 5, 6, 7, 3 };
663 int dma = dmas[i];
664 int boguscnt;
666 /* Don't enable a permanently busy DMA channel, or the machine
667 will hang. */
668 if (test_bit(dma, &dma_channels))
669 continue;
670 outw(0x7f04, ioaddr+LANCE_DATA); /* Clear the memory error bits. */
671 if (request_dma(dma, chipname))
672 continue;
674 flags=claim_dma_lock();
675 set_dma_mode(dma, DMA_MODE_CASCADE);
676 enable_dma(dma);
677 release_dma_lock(flags);
679 /* Trigger an initialization. */
680 outw(0x0001, ioaddr+LANCE_DATA);
681 for (boguscnt = 100; boguscnt > 0; --boguscnt)
682 if (inw(ioaddr+LANCE_DATA) & 0x0900)
683 break;
684 if (inw(ioaddr+LANCE_DATA) & 0x0100) {
685 dev->dma = dma;
686 printk(", DMA %d.\n", dev->dma);
687 break;
688 } else {
689 flags=claim_dma_lock();
690 disable_dma(dma);
691 release_dma_lock(flags);
692 free_dma(dma);
695 if (i == 4) { /* Failure: bail. */
696 printk("DMA detection failed.\n");
697 goto out_tx;
701 if (lance_version == 0 && dev->irq == 0) {
702 /* We may auto-IRQ now that we have a DMA channel. */
703 /* Trigger an initialization just for the interrupt. */
704 unsigned long irq_mask;
706 irq_mask = probe_irq_on();
707 outw(0x0041, ioaddr+LANCE_DATA);
709 mdelay(40);
710 dev->irq = probe_irq_off(irq_mask);
711 if (dev->irq == 0) {
712 printk(" Failed to detect the 7990 IRQ line.\n");
713 goto out_dma;
715 printk(" Auto-IRQ detected IRQ%d.\n", dev->irq);
718 if (chip_table[lp->chip_version].flags & LANCE_ENABLE_AUTOSELECT) {
719 /* Turn on auto-select of media (10baseT or BNC) so that the user
720 can watch the LEDs even if the board isn't opened. */
721 outw(0x0002, ioaddr+LANCE_ADDR);
722 /* Don't touch 10base2 power bit. */
723 outw(inw(ioaddr+LANCE_BUS_IF) | 0x0002, ioaddr+LANCE_BUS_IF);
726 if (lance_debug > 0 && did_version++ == 0)
727 printk(version);
729 /* The LANCE-specific entries in the device structure. */
730 dev->netdev_ops = &lance_netdev_ops;
731 dev->watchdog_timeo = TX_TIMEOUT;
733 err = register_netdev(dev);
734 if (err)
735 goto out_dma;
736 return 0;
737 out_dma:
738 if (dev->dma != 4)
739 free_dma(dev->dma);
740 out_tx:
741 kfree(lp->tx_bounce_buffs);
742 out_rx:
743 kfree((void*)lp->rx_buffs);
744 out_lp:
745 kfree(lp);
746 return err;
750 static int
751 lance_open(struct net_device *dev)
753 struct lance_private *lp = dev->ml_priv;
754 int ioaddr = dev->base_addr;
755 int i;
757 if (dev->irq == 0 ||
758 request_irq(dev->irq, &lance_interrupt, 0, lp->name, dev)) {
759 return -EAGAIN;
762 /* We used to allocate DMA here, but that was silly.
763 DMA lines can't be shared! We now permanently allocate them. */
765 /* Reset the LANCE */
766 inw(ioaddr+LANCE_RESET);
768 /* The DMA controller is used as a no-operation slave, "cascade mode". */
769 if (dev->dma != 4) {
770 unsigned long flags=claim_dma_lock();
771 enable_dma(dev->dma);
772 set_dma_mode(dev->dma, DMA_MODE_CASCADE);
773 release_dma_lock(flags);
776 /* Un-Reset the LANCE, needed only for the NE2100. */
777 if (chip_table[lp->chip_version].flags & LANCE_MUST_UNRESET)
778 outw(0, ioaddr+LANCE_RESET);
780 if (chip_table[lp->chip_version].flags & LANCE_ENABLE_AUTOSELECT) {
781 /* This is 79C960-specific: Turn on auto-select of media (AUI, BNC). */
782 outw(0x0002, ioaddr+LANCE_ADDR);
783 /* Only touch autoselect bit. */
784 outw(inw(ioaddr+LANCE_BUS_IF) | 0x0002, ioaddr+LANCE_BUS_IF);
787 if (lance_debug > 1)
788 printk("%s: lance_open() irq %d dma %d tx/rx rings %#x/%#x init %#x.\n",
789 dev->name, dev->irq, dev->dma,
790 (u32) isa_virt_to_bus(lp->tx_ring),
791 (u32) isa_virt_to_bus(lp->rx_ring),
792 (u32) isa_virt_to_bus(&lp->init_block));
794 lance_init_ring(dev, GFP_KERNEL);
795 /* Re-initialize the LANCE, and start it when done. */
796 outw(0x0001, ioaddr+LANCE_ADDR);
797 outw((short) (u32) isa_virt_to_bus(&lp->init_block), ioaddr+LANCE_DATA);
798 outw(0x0002, ioaddr+LANCE_ADDR);
799 outw(((u32)isa_virt_to_bus(&lp->init_block)) >> 16, ioaddr+LANCE_DATA);
801 outw(0x0004, ioaddr+LANCE_ADDR);
802 outw(0x0915, ioaddr+LANCE_DATA);
804 outw(0x0000, ioaddr+LANCE_ADDR);
805 outw(0x0001, ioaddr+LANCE_DATA);
807 netif_start_queue (dev);
809 i = 0;
810 while (i++ < 100)
811 if (inw(ioaddr+LANCE_DATA) & 0x0100)
812 break;
814 * We used to clear the InitDone bit, 0x0100, here but Mark Stockton
815 * reports that doing so triggers a bug in the '974.
817 outw(0x0042, ioaddr+LANCE_DATA);
819 if (lance_debug > 2)
820 printk("%s: LANCE open after %d ticks, init block %#x csr0 %4.4x.\n",
821 dev->name, i, (u32) isa_virt_to_bus(&lp->init_block), inw(ioaddr+LANCE_DATA));
823 return 0; /* Always succeed */
826 /* The LANCE has been halted for one reason or another (busmaster memory
827 arbitration error, Tx FIFO underflow, driver stopped it to reconfigure,
828 etc.). Modern LANCE variants always reload their ring-buffer
829 configuration when restarted, so we must reinitialize our ring
830 context before restarting. As part of this reinitialization,
831 find all packets still on the Tx ring and pretend that they had been
832 sent (in effect, drop the packets on the floor) - the higher-level
833 protocols will time out and retransmit. It'd be better to shuffle
834 these skbs to a temp list and then actually re-Tx them after
835 restarting the chip, but I'm too lazy to do so right now. dplatt@3do.com
838 static void
839 lance_purge_ring(struct net_device *dev)
841 struct lance_private *lp = dev->ml_priv;
842 int i;
844 /* Free all the skbuffs in the Rx and Tx queues. */
845 for (i = 0; i < RX_RING_SIZE; i++) {
846 struct sk_buff *skb = lp->rx_skbuff[i];
847 lp->rx_skbuff[i] = NULL;
848 lp->rx_ring[i].base = 0; /* Not owned by LANCE chip. */
849 if (skb)
850 dev_kfree_skb_any(skb);
852 for (i = 0; i < TX_RING_SIZE; i++) {
853 if (lp->tx_skbuff[i]) {
854 dev_kfree_skb_any(lp->tx_skbuff[i]);
855 lp->tx_skbuff[i] = NULL;
861 /* Initialize the LANCE Rx and Tx rings. */
862 static void
863 lance_init_ring(struct net_device *dev, gfp_t gfp)
865 struct lance_private *lp = dev->ml_priv;
866 int i;
868 lp->cur_rx = lp->cur_tx = 0;
869 lp->dirty_rx = lp->dirty_tx = 0;
871 for (i = 0; i < RX_RING_SIZE; i++) {
872 struct sk_buff *skb;
873 void *rx_buff;
875 skb = alloc_skb(PKT_BUF_SZ, GFP_DMA | gfp);
876 lp->rx_skbuff[i] = skb;
877 if (skb) {
878 skb->dev = dev;
879 rx_buff = skb->data;
880 } else
881 rx_buff = kmalloc(PKT_BUF_SZ, GFP_DMA | gfp);
882 if (rx_buff == NULL)
883 lp->rx_ring[i].base = 0;
884 else
885 lp->rx_ring[i].base = (u32)isa_virt_to_bus(rx_buff) | 0x80000000;
886 lp->rx_ring[i].buf_length = -PKT_BUF_SZ;
888 /* The Tx buffer address is filled in as needed, but we do need to clear
889 the upper ownership bit. */
890 for (i = 0; i < TX_RING_SIZE; i++) {
891 lp->tx_skbuff[i] = NULL;
892 lp->tx_ring[i].base = 0;
895 lp->init_block.mode = 0x0000;
896 for (i = 0; i < 6; i++)
897 lp->init_block.phys_addr[i] = dev->dev_addr[i];
898 lp->init_block.filter[0] = 0x00000000;
899 lp->init_block.filter[1] = 0x00000000;
900 lp->init_block.rx_ring = ((u32)isa_virt_to_bus(lp->rx_ring) & 0xffffff) | RX_RING_LEN_BITS;
901 lp->init_block.tx_ring = ((u32)isa_virt_to_bus(lp->tx_ring) & 0xffffff) | TX_RING_LEN_BITS;
904 static void
905 lance_restart(struct net_device *dev, unsigned int csr0_bits, int must_reinit)
907 struct lance_private *lp = dev->ml_priv;
909 if (must_reinit ||
910 (chip_table[lp->chip_version].flags & LANCE_MUST_REINIT_RING)) {
911 lance_purge_ring(dev);
912 lance_init_ring(dev, GFP_ATOMIC);
914 outw(0x0000, dev->base_addr + LANCE_ADDR);
915 outw(csr0_bits, dev->base_addr + LANCE_DATA);
919 static void lance_tx_timeout (struct net_device *dev)
921 struct lance_private *lp = (struct lance_private *) dev->ml_priv;
922 int ioaddr = dev->base_addr;
924 outw (0, ioaddr + LANCE_ADDR);
925 printk ("%s: transmit timed out, status %4.4x, resetting.\n",
926 dev->name, inw (ioaddr + LANCE_DATA));
927 outw (0x0004, ioaddr + LANCE_DATA);
928 lp->stats.tx_errors++;
929 #ifndef final_version
930 if (lance_debug > 3) {
931 int i;
932 printk (" Ring data dump: dirty_tx %d cur_tx %d%s cur_rx %d.",
933 lp->dirty_tx, lp->cur_tx, netif_queue_stopped(dev) ? " (full)" : "",
934 lp->cur_rx);
935 for (i = 0; i < RX_RING_SIZE; i++)
936 printk ("%s %08x %04x %04x", i & 0x3 ? "" : "\n ",
937 lp->rx_ring[i].base, -lp->rx_ring[i].buf_length,
938 lp->rx_ring[i].msg_length);
939 for (i = 0; i < TX_RING_SIZE; i++)
940 printk ("%s %08x %04x %04x", i & 0x3 ? "" : "\n ",
941 lp->tx_ring[i].base, -lp->tx_ring[i].length,
942 lp->tx_ring[i].misc);
943 printk ("\n");
945 #endif
946 lance_restart (dev, 0x0043, 1);
948 dev->trans_start = jiffies;
949 netif_wake_queue (dev);
953 static netdev_tx_t lance_start_xmit(struct sk_buff *skb,
954 struct net_device *dev)
956 struct lance_private *lp = dev->ml_priv;
957 int ioaddr = dev->base_addr;
958 int entry;
959 unsigned long flags;
961 spin_lock_irqsave(&lp->devlock, flags);
963 if (lance_debug > 3) {
964 outw(0x0000, ioaddr+LANCE_ADDR);
965 printk("%s: lance_start_xmit() called, csr0 %4.4x.\n", dev->name,
966 inw(ioaddr+LANCE_DATA));
967 outw(0x0000, ioaddr+LANCE_DATA);
970 /* Fill in a Tx ring entry */
972 /* Mask to ring buffer boundary. */
973 entry = lp->cur_tx & TX_RING_MOD_MASK;
975 /* Caution: the write order is important here, set the base address
976 with the "ownership" bits last. */
978 /* The old LANCE chips doesn't automatically pad buffers to min. size. */
979 if (chip_table[lp->chip_version].flags & LANCE_MUST_PAD) {
980 if (skb->len < ETH_ZLEN) {
981 if (skb_padto(skb, ETH_ZLEN))
982 goto out;
983 lp->tx_ring[entry].length = -ETH_ZLEN;
985 else
986 lp->tx_ring[entry].length = -skb->len;
987 } else
988 lp->tx_ring[entry].length = -skb->len;
990 lp->tx_ring[entry].misc = 0x0000;
992 lp->stats.tx_bytes += skb->len;
994 /* If any part of this buffer is >16M we must copy it to a low-memory
995 buffer. */
996 if ((u32)isa_virt_to_bus(skb->data) + skb->len > 0x01000000) {
997 if (lance_debug > 5)
998 printk("%s: bouncing a high-memory packet (%#x).\n",
999 dev->name, (u32)isa_virt_to_bus(skb->data));
1000 skb_copy_from_linear_data(skb, &lp->tx_bounce_buffs[entry], skb->len);
1001 lp->tx_ring[entry].base =
1002 ((u32)isa_virt_to_bus((lp->tx_bounce_buffs + entry)) & 0xffffff) | 0x83000000;
1003 dev_kfree_skb(skb);
1004 } else {
1005 lp->tx_skbuff[entry] = skb;
1006 lp->tx_ring[entry].base = ((u32)isa_virt_to_bus(skb->data) & 0xffffff) | 0x83000000;
1008 lp->cur_tx++;
1010 /* Trigger an immediate send poll. */
1011 outw(0x0000, ioaddr+LANCE_ADDR);
1012 outw(0x0048, ioaddr+LANCE_DATA);
1014 dev->trans_start = jiffies;
1016 if ((lp->cur_tx - lp->dirty_tx) >= TX_RING_SIZE)
1017 netif_stop_queue(dev);
1019 out:
1020 spin_unlock_irqrestore(&lp->devlock, flags);
1021 return NETDEV_TX_OK;
1024 /* The LANCE interrupt handler. */
1025 static irqreturn_t lance_interrupt(int irq, void *dev_id)
1027 struct net_device *dev = dev_id;
1028 struct lance_private *lp;
1029 int csr0, ioaddr, boguscnt=10;
1030 int must_restart;
1032 ioaddr = dev->base_addr;
1033 lp = dev->ml_priv;
1035 spin_lock (&lp->devlock);
1037 outw(0x00, dev->base_addr + LANCE_ADDR);
1038 while ((csr0 = inw(dev->base_addr + LANCE_DATA)) & 0x8600
1039 && --boguscnt >= 0) {
1040 /* Acknowledge all of the current interrupt sources ASAP. */
1041 outw(csr0 & ~0x004f, dev->base_addr + LANCE_DATA);
1043 must_restart = 0;
1045 if (lance_debug > 5)
1046 printk("%s: interrupt csr0=%#2.2x new csr=%#2.2x.\n",
1047 dev->name, csr0, inw(dev->base_addr + LANCE_DATA));
1049 if (csr0 & 0x0400) /* Rx interrupt */
1050 lance_rx(dev);
1052 if (csr0 & 0x0200) { /* Tx-done interrupt */
1053 int dirty_tx = lp->dirty_tx;
1055 while (dirty_tx < lp->cur_tx) {
1056 int entry = dirty_tx & TX_RING_MOD_MASK;
1057 int status = lp->tx_ring[entry].base;
1059 if (status < 0)
1060 break; /* It still hasn't been Txed */
1062 lp->tx_ring[entry].base = 0;
1064 if (status & 0x40000000) {
1065 /* There was an major error, log it. */
1066 int err_status = lp->tx_ring[entry].misc;
1067 lp->stats.tx_errors++;
1068 if (err_status & 0x0400) lp->stats.tx_aborted_errors++;
1069 if (err_status & 0x0800) lp->stats.tx_carrier_errors++;
1070 if (err_status & 0x1000) lp->stats.tx_window_errors++;
1071 if (err_status & 0x4000) {
1072 /* Ackk! On FIFO errors the Tx unit is turned off! */
1073 lp->stats.tx_fifo_errors++;
1074 /* Remove this verbosity later! */
1075 printk("%s: Tx FIFO error! Status %4.4x.\n",
1076 dev->name, csr0);
1077 /* Restart the chip. */
1078 must_restart = 1;
1080 } else {
1081 if (status & 0x18000000)
1082 lp->stats.collisions++;
1083 lp->stats.tx_packets++;
1086 /* We must free the original skb if it's not a data-only copy
1087 in the bounce buffer. */
1088 if (lp->tx_skbuff[entry]) {
1089 dev_kfree_skb_irq(lp->tx_skbuff[entry]);
1090 lp->tx_skbuff[entry] = NULL;
1092 dirty_tx++;
1095 #ifndef final_version
1096 if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) {
1097 printk("out-of-sync dirty pointer, %d vs. %d, full=%s.\n",
1098 dirty_tx, lp->cur_tx,
1099 netif_queue_stopped(dev) ? "yes" : "no");
1100 dirty_tx += TX_RING_SIZE;
1102 #endif
1104 /* if the ring is no longer full, accept more packets */
1105 if (netif_queue_stopped(dev) &&
1106 dirty_tx > lp->cur_tx - TX_RING_SIZE + 2)
1107 netif_wake_queue (dev);
1109 lp->dirty_tx = dirty_tx;
1112 /* Log misc errors. */
1113 if (csr0 & 0x4000) lp->stats.tx_errors++; /* Tx babble. */
1114 if (csr0 & 0x1000) lp->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;
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);
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);
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));
1139 spin_unlock (&lp->devlock);
1140 return IRQ_HANDLED;
1143 static int
1144 lance_rx(struct net_device *dev)
1146 struct lance_private *lp = dev->ml_priv;
1147 int entry = lp->cur_rx & RX_RING_MOD_MASK;
1148 int i;
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;
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 lp->stats.rx_errors++; /* end of a packet.*/
1161 if (status & 0x20) lp->stats.rx_frame_errors++;
1162 if (status & 0x10) lp->stats.rx_over_errors++;
1163 if (status & 0x08) lp->stats.rx_crc_errors++;
1164 if (status & 0x04) lp->stats.rx_fifo_errors++;
1165 lp->rx_ring[entry].base &= 0x03ffffff;
1167 else
1169 /* Malloc up new buffer, compatible with net3. */
1170 short pkt_len = (lp->rx_ring[entry].msg_length & 0xfff)-4;
1171 struct sk_buff *skb;
1173 if(pkt_len<60)
1175 printk("%s: Runt packet!\n",dev->name);
1176 lp->stats.rx_errors++;
1178 else
1180 skb = dev_alloc_skb(pkt_len+2);
1181 if (skb == NULL)
1183 printk("%s: Memory squeeze, deferring packet.\n", dev->name);
1184 for (i=0; i < RX_RING_SIZE; i++)
1185 if (lp->rx_ring[(entry+i) & RX_RING_MOD_MASK].base < 0)
1186 break;
1188 if (i > RX_RING_SIZE -2)
1190 lp->stats.rx_dropped++;
1191 lp->rx_ring[entry].base |= 0x80000000;
1192 lp->cur_rx++;
1194 break;
1196 skb_reserve(skb,2); /* 16 byte align */
1197 skb_put(skb,pkt_len); /* Make room */
1198 skb_copy_to_linear_data(skb,
1199 (unsigned char *)isa_bus_to_virt((lp->rx_ring[entry].base & 0x00ffffff)),
1200 pkt_len);
1201 skb->protocol=eth_type_trans(skb,dev);
1202 netif_rx(skb);
1203 lp->stats.rx_packets++;
1204 lp->stats.rx_bytes+=pkt_len;
1207 /* The docs say that the buffer length isn't touched, but Andrew Boyd
1208 of QNX reports that some revs of the 79C965 clear it. */
1209 lp->rx_ring[entry].buf_length = -PKT_BUF_SZ;
1210 lp->rx_ring[entry].base |= 0x80000000;
1211 entry = (++lp->cur_rx) & RX_RING_MOD_MASK;
1214 /* We should check that at least two ring entries are free. If not,
1215 we should free one and mark stats->rx_dropped++. */
1217 return 0;
1220 static int
1221 lance_close(struct net_device *dev)
1223 int ioaddr = dev->base_addr;
1224 struct lance_private *lp = dev->ml_priv;
1226 netif_stop_queue (dev);
1228 if (chip_table[lp->chip_version].flags & LANCE_HAS_MISSED_FRAME) {
1229 outw(112, ioaddr+LANCE_ADDR);
1230 lp->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA);
1232 outw(0, ioaddr+LANCE_ADDR);
1234 if (lance_debug > 1)
1235 printk("%s: Shutting down ethercard, status was %2.2x.\n",
1236 dev->name, inw(ioaddr+LANCE_DATA));
1238 /* We stop the LANCE here -- it occasionally polls
1239 memory if we don't. */
1240 outw(0x0004, ioaddr+LANCE_DATA);
1242 if (dev->dma != 4)
1244 unsigned long flags=claim_dma_lock();
1245 disable_dma(dev->dma);
1246 release_dma_lock(flags);
1248 free_irq(dev->irq, dev);
1250 lance_purge_ring(dev);
1252 return 0;
1255 static struct net_device_stats *lance_get_stats(struct net_device *dev)
1257 struct lance_private *lp = dev->ml_priv;
1259 if (chip_table[lp->chip_version].flags & LANCE_HAS_MISSED_FRAME) {
1260 short ioaddr = dev->base_addr;
1261 short saved_addr;
1262 unsigned long flags;
1264 spin_lock_irqsave(&lp->devlock, flags);
1265 saved_addr = inw(ioaddr+LANCE_ADDR);
1266 outw(112, ioaddr+LANCE_ADDR);
1267 lp->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA);
1268 outw(saved_addr, ioaddr+LANCE_ADDR);
1269 spin_unlock_irqrestore(&lp->devlock, flags);
1272 return &lp->stats;
1275 /* Set or clear the multicast filter for this adaptor.
1278 static void set_multicast_list(struct net_device *dev)
1280 short ioaddr = dev->base_addr;
1282 outw(0, ioaddr+LANCE_ADDR);
1283 outw(0x0004, ioaddr+LANCE_DATA); /* Temporarily stop the lance. */
1285 if (dev->flags&IFF_PROMISC) {
1286 outw(15, ioaddr+LANCE_ADDR);
1287 outw(0x8000, ioaddr+LANCE_DATA); /* Set promiscuous mode */
1288 } else {
1289 short multicast_table[4];
1290 int i;
1291 int num_addrs=dev->mc_count;
1292 if(dev->flags&IFF_ALLMULTI)
1293 num_addrs=1;
1294 /* FIXIT: We don't use the multicast table, but rely on upper-layer filtering. */
1295 memset(multicast_table, (num_addrs == 0) ? 0 : -1, sizeof(multicast_table));
1296 for (i = 0; i < 4; i++) {
1297 outw(8 + i, ioaddr+LANCE_ADDR);
1298 outw(multicast_table[i], ioaddr+LANCE_DATA);
1300 outw(15, ioaddr+LANCE_ADDR);
1301 outw(0x0000, ioaddr+LANCE_DATA); /* Unset promiscuous mode */
1304 lance_restart(dev, 0x0142, 0); /* Resume normal operation */