diff options
Diffstat (limited to 'drivers/net/3c527.c')
-rw-r--r-- | drivers/net/3c527.c | 1675 |
1 files changed, 1675 insertions, 0 deletions
diff --git a/drivers/net/3c527.c b/drivers/net/3c527.c new file mode 100644 index 000000000000..6db3301e7965 --- /dev/null +++ b/drivers/net/3c527.c | |||
@@ -0,0 +1,1675 @@ | |||
1 | /* 3c527.c: 3Com Etherlink/MC32 driver for Linux 2.4 and 2.6. | ||
2 | * | ||
3 | * (c) Copyright 1998 Red Hat Software Inc | ||
4 | * Written by Alan Cox. | ||
5 | * Further debugging by Carl Drougge. | ||
6 | * Initial SMP support by Felipe W Damasio <felipewd@terra.com.br> | ||
7 | * Heavily modified by Richard Procter <rnp@paradise.net.nz> | ||
8 | * | ||
9 | * Based on skeleton.c written 1993-94 by Donald Becker and ne2.c | ||
10 | * (for the MCA stuff) written by Wim Dumon. | ||
11 | * | ||
12 | * Thanks to 3Com for making this possible by providing me with the | ||
13 | * documentation. | ||
14 | * | ||
15 | * This software may be used and distributed according to the terms | ||
16 | * of the GNU General Public License, incorporated herein by reference. | ||
17 | * | ||
18 | */ | ||
19 | |||
20 | #define DRV_NAME "3c527" | ||
21 | #define DRV_VERSION "0.7-SMP" | ||
22 | #define DRV_RELDATE "2003/09/21" | ||
23 | |||
24 | static const char *version = | ||
25 | DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " Richard Procter <rnp@paradise.net.nz>\n"; | ||
26 | |||
27 | /** | ||
28 | * DOC: Traps for the unwary | ||
29 | * | ||
30 | * The diagram (Figure 1-1) and the POS summary disagree with the | ||
31 | * "Interrupt Level" section in the manual. | ||
32 | * | ||
33 | * The manual contradicts itself when describing the minimum number | ||
34 | * buffers in the 'configure lists' command. | ||
35 | * My card accepts a buffer config of 4/4. | ||
36 | * | ||
37 | * Setting the SAV BP bit does not save bad packets, but | ||
38 | * only enables RX on-card stats collection. | ||
39 | * | ||
40 | * The documentation in places seems to miss things. In actual fact | ||
41 | * I've always eventually found everything is documented, it just | ||
42 | * requires careful study. | ||
43 | * | ||
44 | * DOC: Theory Of Operation | ||
45 | * | ||
46 | * The 3com 3c527 is a 32bit MCA bus mastering adapter with a large | ||
47 | * amount of on board intelligence that housekeeps a somewhat dumber | ||
48 | * Intel NIC. For performance we want to keep the transmit queue deep | ||
49 | * as the card can transmit packets while fetching others from main | ||
50 | * memory by bus master DMA. Transmission and reception are driven by | ||
51 | * circular buffer queues. | ||
52 | * | ||
53 | * The mailboxes can be used for controlling how the card traverses | ||
54 | * its buffer rings, but are used only for inital setup in this | ||
55 | * implementation. The exec mailbox allows a variety of commands to | ||
56 | * be executed. Each command must complete before the next is | ||
57 | * executed. Primarily we use the exec mailbox for controlling the | ||
58 | * multicast lists. We have to do a certain amount of interesting | ||
59 | * hoop jumping as the multicast list changes can occur in interrupt | ||
60 | * state when the card has an exec command pending. We defer such | ||
61 | * events until the command completion interrupt. | ||
62 | * | ||
63 | * A copy break scheme (taken from 3c59x.c) is employed whereby | ||
64 | * received frames exceeding a configurable length are passed | ||
65 | * directly to the higher networking layers without incuring a copy, | ||
66 | * in what amounts to a time/space trade-off. | ||
67 | * | ||
68 | * The card also keeps a large amount of statistical information | ||
69 | * on-board. In a perfect world, these could be used safely at no | ||
70 | * cost. However, lacking information to the contrary, processing | ||
71 | * them without races would involve so much extra complexity as to | ||
72 | * make it unworthwhile to do so. In the end, a hybrid SW/HW | ||
73 | * implementation was made necessary --- see mc32_update_stats(). | ||
74 | * | ||
75 | * DOC: Notes | ||
76 | * | ||
77 | * It should be possible to use two or more cards, but at this stage | ||
78 | * only by loading two copies of the same module. | ||
79 | * | ||
80 | * The on-board 82586 NIC has trouble receiving multiple | ||
81 | * back-to-back frames and so is likely to drop packets from fast | ||
82 | * senders. | ||
83 | **/ | ||
84 | |||
85 | #include <linux/module.h> | ||
86 | |||
87 | #include <linux/errno.h> | ||
88 | #include <linux/netdevice.h> | ||
89 | #include <linux/etherdevice.h> | ||
90 | #include <linux/if_ether.h> | ||
91 | #include <linux/init.h> | ||
92 | #include <linux/kernel.h> | ||
93 | #include <linux/types.h> | ||
94 | #include <linux/fcntl.h> | ||
95 | #include <linux/interrupt.h> | ||
96 | #include <linux/mca-legacy.h> | ||
97 | #include <linux/ioport.h> | ||
98 | #include <linux/in.h> | ||
99 | #include <linux/skbuff.h> | ||
100 | #include <linux/slab.h> | ||
101 | #include <linux/string.h> | ||
102 | #include <linux/wait.h> | ||
103 | #include <linux/ethtool.h> | ||
104 | #include <linux/completion.h> | ||
105 | #include <linux/bitops.h> | ||
106 | |||
107 | #include <asm/semaphore.h> | ||
108 | #include <asm/uaccess.h> | ||
109 | #include <asm/system.h> | ||
110 | #include <asm/io.h> | ||
111 | #include <asm/dma.h> | ||
112 | |||
113 | #include "3c527.h" | ||
114 | |||
115 | MODULE_LICENSE("GPL"); | ||
116 | |||
117 | /* | ||
118 | * The name of the card. Is used for messages and in the requests for | ||
119 | * io regions, irqs and dma channels | ||
120 | */ | ||
121 | static const char* cardname = DRV_NAME; | ||
122 | |||
123 | /* use 0 for production, 1 for verification, >2 for debug */ | ||
124 | #ifndef NET_DEBUG | ||
125 | #define NET_DEBUG 2 | ||
126 | #endif | ||
127 | |||
128 | #undef DEBUG_IRQ | ||
129 | |||
130 | static unsigned int mc32_debug = NET_DEBUG; | ||
131 | |||
132 | /* The number of low I/O ports used by the ethercard. */ | ||
133 | #define MC32_IO_EXTENT 8 | ||
134 | |||
135 | /* As implemented, values must be a power-of-2 -- 4/8/16/32 */ | ||
136 | #define TX_RING_LEN 32 /* Typically the card supports 37 */ | ||
137 | #define RX_RING_LEN 8 /* " " " */ | ||
138 | |||
139 | /* Copy break point, see above for details. | ||
140 | * Setting to > 1512 effectively disables this feature. */ | ||
141 | #define RX_COPYBREAK 200 /* Value from 3c59x.c */ | ||
142 | |||
143 | /* Issue the 82586 workaround command - this is for "busy lans", but | ||
144 | * basically means for all lans now days - has a performance (latency) | ||
145 | * cost, but best set. */ | ||
146 | static const int WORKAROUND_82586=1; | ||
147 | |||
148 | /* Pointers to buffers and their on-card records */ | ||
149 | struct mc32_ring_desc | ||
150 | { | ||
151 | volatile struct skb_header *p; | ||
152 | struct sk_buff *skb; | ||
153 | }; | ||
154 | |||
155 | /* Information that needs to be kept for each board. */ | ||
156 | struct mc32_local | ||
157 | { | ||
158 | int slot; | ||
159 | |||
160 | u32 base; | ||
161 | struct net_device_stats net_stats; | ||
162 | volatile struct mc32_mailbox *rx_box; | ||
163 | volatile struct mc32_mailbox *tx_box; | ||
164 | volatile struct mc32_mailbox *exec_box; | ||
165 | volatile struct mc32_stats *stats; /* Start of on-card statistics */ | ||
166 | u16 tx_chain; /* Transmit list start offset */ | ||
167 | u16 rx_chain; /* Receive list start offset */ | ||
168 | u16 tx_len; /* Transmit list count */ | ||
169 | u16 rx_len; /* Receive list count */ | ||
170 | |||
171 | u16 xceiver_desired_state; /* HALTED or RUNNING */ | ||
172 | u16 cmd_nonblocking; /* Thread is uninterested in command result */ | ||
173 | u16 mc_reload_wait; /* A multicast load request is pending */ | ||
174 | u32 mc_list_valid; /* True when the mclist is set */ | ||
175 | |||
176 | struct mc32_ring_desc tx_ring[TX_RING_LEN]; /* Host Transmit ring */ | ||
177 | struct mc32_ring_desc rx_ring[RX_RING_LEN]; /* Host Receive ring */ | ||
178 | |||
179 | atomic_t tx_count; /* buffers left */ | ||
180 | atomic_t tx_ring_head; /* index to tx en-queue end */ | ||
181 | u16 tx_ring_tail; /* index to tx de-queue end */ | ||
182 | |||
183 | u16 rx_ring_tail; /* index to rx de-queue end */ | ||
184 | |||
185 | struct semaphore cmd_mutex; /* Serialises issuing of execute commands */ | ||
186 | struct completion execution_cmd; /* Card has completed an execute command */ | ||
187 | struct completion xceiver_cmd; /* Card has completed a tx or rx command */ | ||
188 | }; | ||
189 | |||
190 | /* The station (ethernet) address prefix, used for a sanity check. */ | ||
191 | #define SA_ADDR0 0x02 | ||
192 | #define SA_ADDR1 0x60 | ||
193 | #define SA_ADDR2 0xAC | ||
194 | |||
195 | struct mca_adapters_t { | ||
196 | unsigned int id; | ||
197 | char *name; | ||
198 | }; | ||
199 | |||
200 | static const struct mca_adapters_t mc32_adapters[] = { | ||
201 | { 0x0041, "3COM EtherLink MC/32" }, | ||
202 | { 0x8EF5, "IBM High Performance Lan Adapter" }, | ||
203 | { 0x0000, NULL } | ||
204 | }; | ||
205 | |||
206 | |||
207 | /* Macros for ring index manipulations */ | ||
208 | static inline u16 next_rx(u16 rx) { return (rx+1)&(RX_RING_LEN-1); }; | ||
209 | static inline u16 prev_rx(u16 rx) { return (rx-1)&(RX_RING_LEN-1); }; | ||
210 | |||
211 | static inline u16 next_tx(u16 tx) { return (tx+1)&(TX_RING_LEN-1); }; | ||
212 | |||
213 | |||
214 | /* Index to functions, as function prototypes. */ | ||
215 | static int mc32_probe1(struct net_device *dev, int ioaddr); | ||
216 | static int mc32_command(struct net_device *dev, u16 cmd, void *data, int len); | ||
217 | static int mc32_open(struct net_device *dev); | ||
218 | static void mc32_timeout(struct net_device *dev); | ||
219 | static int mc32_send_packet(struct sk_buff *skb, struct net_device *dev); | ||
220 | static irqreturn_t mc32_interrupt(int irq, void *dev_id, struct pt_regs *regs); | ||
221 | static int mc32_close(struct net_device *dev); | ||
222 | static struct net_device_stats *mc32_get_stats(struct net_device *dev); | ||
223 | static void mc32_set_multicast_list(struct net_device *dev); | ||
224 | static void mc32_reset_multicast_list(struct net_device *dev); | ||
225 | static struct ethtool_ops netdev_ethtool_ops; | ||
226 | |||
227 | static void cleanup_card(struct net_device *dev) | ||
228 | { | ||
229 | struct mc32_local *lp = netdev_priv(dev); | ||
230 | unsigned slot = lp->slot; | ||
231 | mca_mark_as_unused(slot); | ||
232 | mca_set_adapter_name(slot, NULL); | ||
233 | free_irq(dev->irq, dev); | ||
234 | release_region(dev->base_addr, MC32_IO_EXTENT); | ||
235 | } | ||
236 | |||
237 | /** | ||
238 | * mc32_probe - Search for supported boards | ||
239 | * @unit: interface number to use | ||
240 | * | ||
241 | * Because MCA bus is a real bus and we can scan for cards we could do a | ||
242 | * single scan for all boards here. Right now we use the passed in device | ||
243 | * structure and scan for only one board. This needs fixing for modules | ||
244 | * in particular. | ||
245 | */ | ||
246 | |||
247 | struct net_device *__init mc32_probe(int unit) | ||
248 | { | ||
249 | struct net_device *dev = alloc_etherdev(sizeof(struct mc32_local)); | ||
250 | static int current_mca_slot = -1; | ||
251 | int i; | ||
252 | int err; | ||
253 | |||
254 | if (!dev) | ||
255 | return ERR_PTR(-ENOMEM); | ||
256 | |||
257 | if (unit >= 0) | ||
258 | sprintf(dev->name, "eth%d", unit); | ||
259 | |||
260 | SET_MODULE_OWNER(dev); | ||
261 | |||
262 | /* Do not check any supplied i/o locations. | ||
263 | POS registers usually don't fail :) */ | ||
264 | |||
265 | /* MCA cards have POS registers. | ||
266 | Autodetecting MCA cards is extremely simple. | ||
267 | Just search for the card. */ | ||
268 | |||
269 | for(i = 0; (mc32_adapters[i].name != NULL); i++) { | ||
270 | current_mca_slot = | ||
271 | mca_find_unused_adapter(mc32_adapters[i].id, 0); | ||
272 | |||
273 | if(current_mca_slot != MCA_NOTFOUND) { | ||
274 | if(!mc32_probe1(dev, current_mca_slot)) | ||
275 | { | ||
276 | mca_set_adapter_name(current_mca_slot, | ||
277 | mc32_adapters[i].name); | ||
278 | mca_mark_as_used(current_mca_slot); | ||
279 | err = register_netdev(dev); | ||
280 | if (err) { | ||
281 | cleanup_card(dev); | ||
282 | free_netdev(dev); | ||
283 | dev = ERR_PTR(err); | ||
284 | } | ||
285 | return dev; | ||
286 | } | ||
287 | |||
288 | } | ||
289 | } | ||
290 | free_netdev(dev); | ||
291 | return ERR_PTR(-ENODEV); | ||
292 | } | ||
293 | |||
294 | /** | ||
295 | * mc32_probe1 - Check a given slot for a board and test the card | ||
296 | * @dev: Device structure to fill in | ||
297 | * @slot: The MCA bus slot being used by this card | ||
298 | * | ||
299 | * Decode the slot data and configure the card structures. Having done this we | ||
300 | * can reset the card and configure it. The card does a full self test cycle | ||
301 | * in firmware so we have to wait for it to return and post us either a | ||
302 | * failure case or some addresses we use to find the board internals. | ||
303 | */ | ||
304 | |||
305 | static int __init mc32_probe1(struct net_device *dev, int slot) | ||
306 | { | ||
307 | static unsigned version_printed; | ||
308 | int i, err; | ||
309 | u8 POS; | ||
310 | u32 base; | ||
311 | struct mc32_local *lp = netdev_priv(dev); | ||
312 | static u16 mca_io_bases[]={ | ||
313 | 0x7280,0x7290, | ||
314 | 0x7680,0x7690, | ||
315 | 0x7A80,0x7A90, | ||
316 | 0x7E80,0x7E90 | ||
317 | }; | ||
318 | static u32 mca_mem_bases[]={ | ||
319 | 0x00C0000, | ||
320 | 0x00C4000, | ||
321 | 0x00C8000, | ||
322 | 0x00CC000, | ||
323 | 0x00D0000, | ||
324 | 0x00D4000, | ||
325 | 0x00D8000, | ||
326 | 0x00DC000 | ||
327 | }; | ||
328 | static char *failures[]={ | ||
329 | "Processor instruction", | ||
330 | "Processor data bus", | ||
331 | "Processor data bus", | ||
332 | "Processor data bus", | ||
333 | "Adapter bus", | ||
334 | "ROM checksum", | ||
335 | "Base RAM", | ||
336 | "Extended RAM", | ||
337 | "82586 internal loopback", | ||
338 | "82586 initialisation failure", | ||
339 | "Adapter list configuration error" | ||
340 | }; | ||
341 | |||
342 | /* Time to play MCA games */ | ||
343 | |||
344 | if (mc32_debug && version_printed++ == 0) | ||
345 | printk(KERN_DEBUG "%s", version); | ||
346 | |||
347 | printk(KERN_INFO "%s: %s found in slot %d:", dev->name, cardname, slot); | ||
348 | |||
349 | POS = mca_read_stored_pos(slot, 2); | ||
350 | |||
351 | if(!(POS&1)) | ||
352 | { | ||
353 | printk(" disabled.\n"); | ||
354 | return -ENODEV; | ||
355 | } | ||
356 | |||
357 | /* Fill in the 'dev' fields. */ | ||
358 | dev->base_addr = mca_io_bases[(POS>>1)&7]; | ||
359 | dev->mem_start = mca_mem_bases[(POS>>4)&7]; | ||
360 | |||
361 | POS = mca_read_stored_pos(slot, 4); | ||
362 | if(!(POS&1)) | ||
363 | { | ||
364 | printk("memory window disabled.\n"); | ||
365 | return -ENODEV; | ||
366 | } | ||
367 | |||
368 | POS = mca_read_stored_pos(slot, 5); | ||
369 | |||
370 | i=(POS>>4)&3; | ||
371 | if(i==3) | ||
372 | { | ||
373 | printk("invalid memory window.\n"); | ||
374 | return -ENODEV; | ||
375 | } | ||
376 | |||
377 | i*=16384; | ||
378 | i+=16384; | ||
379 | |||
380 | dev->mem_end=dev->mem_start + i; | ||
381 | |||
382 | dev->irq = ((POS>>2)&3)+9; | ||
383 | |||
384 | if(!request_region(dev->base_addr, MC32_IO_EXTENT, cardname)) | ||
385 | { | ||
386 | printk("io 0x%3lX, which is busy.\n", dev->base_addr); | ||
387 | return -EBUSY; | ||
388 | } | ||
389 | |||
390 | printk("io 0x%3lX irq %d mem 0x%lX (%dK)\n", | ||
391 | dev->base_addr, dev->irq, dev->mem_start, i/1024); | ||
392 | |||
393 | |||
394 | /* We ought to set the cache line size here.. */ | ||
395 | |||
396 | |||
397 | /* | ||
398 | * Go PROM browsing | ||
399 | */ | ||
400 | |||
401 | printk("%s: Address ", dev->name); | ||
402 | |||
403 | /* Retrieve and print the ethernet address. */ | ||
404 | for (i = 0; i < 6; i++) | ||
405 | { | ||
406 | mca_write_pos(slot, 6, i+12); | ||
407 | mca_write_pos(slot, 7, 0); | ||
408 | |||
409 | printk(" %2.2x", dev->dev_addr[i] = mca_read_pos(slot,3)); | ||
410 | } | ||
411 | |||
412 | mca_write_pos(slot, 6, 0); | ||
413 | mca_write_pos(slot, 7, 0); | ||
414 | |||
415 | POS = mca_read_stored_pos(slot, 4); | ||
416 | |||
417 | if(POS&2) | ||
418 | printk(" : BNC port selected.\n"); | ||
419 | else | ||
420 | printk(" : AUI port selected.\n"); | ||
421 | |||
422 | POS=inb(dev->base_addr+HOST_CTRL); | ||
423 | POS|=HOST_CTRL_ATTN|HOST_CTRL_RESET; | ||
424 | POS&=~HOST_CTRL_INTE; | ||
425 | outb(POS, dev->base_addr+HOST_CTRL); | ||
426 | /* Reset adapter */ | ||
427 | udelay(100); | ||
428 | /* Reset off */ | ||
429 | POS&=~(HOST_CTRL_ATTN|HOST_CTRL_RESET); | ||
430 | outb(POS, dev->base_addr+HOST_CTRL); | ||
431 | |||
432 | udelay(300); | ||
433 | |||
434 | /* | ||
435 | * Grab the IRQ | ||
436 | */ | ||
437 | |||
438 | err = request_irq(dev->irq, &mc32_interrupt, SA_SHIRQ | SA_SAMPLE_RANDOM, DRV_NAME, dev); | ||
439 | if (err) { | ||
440 | release_region(dev->base_addr, MC32_IO_EXTENT); | ||
441 | printk(KERN_ERR "%s: unable to get IRQ %d.\n", DRV_NAME, dev->irq); | ||
442 | goto err_exit_ports; | ||
443 | } | ||
444 | |||
445 | memset(lp, 0, sizeof(struct mc32_local)); | ||
446 | lp->slot = slot; | ||
447 | |||
448 | i=0; | ||
449 | |||
450 | base = inb(dev->base_addr); | ||
451 | |||
452 | while(base == 0xFF) | ||
453 | { | ||
454 | i++; | ||
455 | if(i == 1000) | ||
456 | { | ||
457 | printk(KERN_ERR "%s: failed to boot adapter.\n", dev->name); | ||
458 | err = -ENODEV; | ||
459 | goto err_exit_irq; | ||
460 | } | ||
461 | udelay(1000); | ||
462 | if(inb(dev->base_addr+2)&(1<<5)) | ||
463 | base = inb(dev->base_addr); | ||
464 | } | ||
465 | |||
466 | if(base>0) | ||
467 | { | ||
468 | if(base < 0x0C) | ||
469 | printk(KERN_ERR "%s: %s%s.\n", dev->name, failures[base-1], | ||
470 | base<0x0A?" test failure":""); | ||
471 | else | ||
472 | printk(KERN_ERR "%s: unknown failure %d.\n", dev->name, base); | ||
473 | err = -ENODEV; | ||
474 | goto err_exit_irq; | ||
475 | } | ||
476 | |||
477 | base=0; | ||
478 | for(i=0;i<4;i++) | ||
479 | { | ||
480 | int n=0; | ||
481 | |||
482 | while(!(inb(dev->base_addr+2)&(1<<5))) | ||
483 | { | ||
484 | n++; | ||
485 | udelay(50); | ||
486 | if(n>100) | ||
487 | { | ||
488 | printk(KERN_ERR "%s: mailbox read fail (%d).\n", dev->name, i); | ||
489 | err = -ENODEV; | ||
490 | goto err_exit_irq; | ||
491 | } | ||
492 | } | ||
493 | |||
494 | base|=(inb(dev->base_addr)<<(8*i)); | ||
495 | } | ||
496 | |||
497 | lp->exec_box=isa_bus_to_virt(dev->mem_start+base); | ||
498 | |||
499 | base=lp->exec_box->data[1]<<16|lp->exec_box->data[0]; | ||
500 | |||
501 | lp->base = dev->mem_start+base; | ||
502 | |||
503 | lp->rx_box=isa_bus_to_virt(lp->base + lp->exec_box->data[2]); | ||
504 | lp->tx_box=isa_bus_to_virt(lp->base + lp->exec_box->data[3]); | ||
505 | |||
506 | lp->stats = isa_bus_to_virt(lp->base + lp->exec_box->data[5]); | ||
507 | |||
508 | /* | ||
509 | * Descriptor chains (card relative) | ||
510 | */ | ||
511 | |||
512 | lp->tx_chain = lp->exec_box->data[8]; /* Transmit list start offset */ | ||
513 | lp->rx_chain = lp->exec_box->data[10]; /* Receive list start offset */ | ||
514 | lp->tx_len = lp->exec_box->data[9]; /* Transmit list count */ | ||
515 | lp->rx_len = lp->exec_box->data[11]; /* Receive list count */ | ||
516 | |||
517 | init_MUTEX_LOCKED(&lp->cmd_mutex); | ||
518 | init_completion(&lp->execution_cmd); | ||
519 | init_completion(&lp->xceiver_cmd); | ||
520 | |||
521 | printk("%s: Firmware Rev %d. %d RX buffers, %d TX buffers. Base of 0x%08X.\n", | ||
522 | dev->name, lp->exec_box->data[12], lp->rx_len, lp->tx_len, lp->base); | ||
523 | |||
524 | dev->open = mc32_open; | ||
525 | dev->stop = mc32_close; | ||
526 | dev->hard_start_xmit = mc32_send_packet; | ||
527 | dev->get_stats = mc32_get_stats; | ||
528 | dev->set_multicast_list = mc32_set_multicast_list; | ||
529 | dev->tx_timeout = mc32_timeout; | ||
530 | dev->watchdog_timeo = HZ*5; /* Board does all the work */ | ||
531 | dev->ethtool_ops = &netdev_ethtool_ops; | ||
532 | |||
533 | return 0; | ||
534 | |||
535 | err_exit_irq: | ||
536 | free_irq(dev->irq, dev); | ||
537 | err_exit_ports: | ||
538 | release_region(dev->base_addr, MC32_IO_EXTENT); | ||
539 | return err; | ||
540 | } | ||
541 | |||
542 | |||
543 | /** | ||
544 | * mc32_ready_poll - wait until we can feed it a command | ||
545 | * @dev: The device to wait for | ||
546 | * | ||
547 | * Wait until the card becomes ready to accept a command via the | ||
548 | * command register. This tells us nothing about the completion | ||
549 | * status of any pending commands and takes very little time at all. | ||
550 | */ | ||
551 | |||
552 | static inline void mc32_ready_poll(struct net_device *dev) | ||
553 | { | ||
554 | int ioaddr = dev->base_addr; | ||
555 | while(!(inb(ioaddr+HOST_STATUS)&HOST_STATUS_CRR)); | ||
556 | } | ||
557 | |||
558 | |||
559 | /** | ||
560 | * mc32_command_nowait - send a command non blocking | ||
561 | * @dev: The 3c527 to issue the command to | ||
562 | * @cmd: The command word to write to the mailbox | ||
563 | * @data: A data block if the command expects one | ||
564 | * @len: Length of the data block | ||
565 | * | ||
566 | * Send a command from interrupt state. If there is a command | ||
567 | * currently being executed then we return an error of -1. It | ||
568 | * simply isn't viable to wait around as commands may be | ||
569 | * slow. This can theoretically be starved on SMP, but it's hard | ||
570 | * to see a realistic situation. We do not wait for the command | ||
571 | * to complete --- we rely on the interrupt handler to tidy up | ||
572 | * after us. | ||
573 | */ | ||
574 | |||
575 | static int mc32_command_nowait(struct net_device *dev, u16 cmd, void *data, int len) | ||
576 | { | ||
577 | struct mc32_local *lp = netdev_priv(dev); | ||
578 | int ioaddr = dev->base_addr; | ||
579 | int ret = -1; | ||
580 | |||
581 | if (down_trylock(&lp->cmd_mutex) == 0) | ||
582 | { | ||
583 | lp->cmd_nonblocking=1; | ||
584 | lp->exec_box->mbox=0; | ||
585 | lp->exec_box->mbox=cmd; | ||
586 | memcpy((void *)lp->exec_box->data, data, len); | ||
587 | barrier(); /* the memcpy forgot the volatile so be sure */ | ||
588 | |||
589 | /* Send the command */ | ||
590 | mc32_ready_poll(dev); | ||
591 | outb(1<<6, ioaddr+HOST_CMD); | ||
592 | |||
593 | ret = 0; | ||
594 | |||
595 | /* Interrupt handler will signal mutex on completion */ | ||
596 | } | ||
597 | |||
598 | return ret; | ||
599 | } | ||
600 | |||
601 | |||
602 | /** | ||
603 | * mc32_command - send a command and sleep until completion | ||
604 | * @dev: The 3c527 card to issue the command to | ||
605 | * @cmd: The command word to write to the mailbox | ||
606 | * @data: A data block if the command expects one | ||
607 | * @len: Length of the data block | ||
608 | * | ||
609 | * Sends exec commands in a user context. This permits us to wait around | ||
610 | * for the replies and also to wait for the command buffer to complete | ||
611 | * from a previous command before we execute our command. After our | ||
612 | * command completes we will attempt any pending multicast reload | ||
613 | * we blocked off by hogging the exec buffer. | ||
614 | * | ||
615 | * You feed the card a command, you wait, it interrupts you get a | ||
616 | * reply. All well and good. The complication arises because you use | ||
617 | * commands for filter list changes which come in at bh level from things | ||
618 | * like IPV6 group stuff. | ||
619 | */ | ||
620 | |||
621 | static int mc32_command(struct net_device *dev, u16 cmd, void *data, int len) | ||
622 | { | ||
623 | struct mc32_local *lp = netdev_priv(dev); | ||
624 | int ioaddr = dev->base_addr; | ||
625 | int ret = 0; | ||
626 | |||
627 | down(&lp->cmd_mutex); | ||
628 | |||
629 | /* | ||
630 | * My Turn | ||
631 | */ | ||
632 | |||
633 | lp->cmd_nonblocking=0; | ||
634 | lp->exec_box->mbox=0; | ||
635 | lp->exec_box->mbox=cmd; | ||
636 | memcpy((void *)lp->exec_box->data, data, len); | ||
637 | barrier(); /* the memcpy forgot the volatile so be sure */ | ||
638 | |||
639 | mc32_ready_poll(dev); | ||
640 | outb(1<<6, ioaddr+HOST_CMD); | ||
641 | |||
642 | wait_for_completion(&lp->execution_cmd); | ||
643 | |||
644 | if(lp->exec_box->mbox&(1<<13)) | ||
645 | ret = -1; | ||
646 | |||
647 | up(&lp->cmd_mutex); | ||
648 | |||
649 | /* | ||
650 | * A multicast set got blocked - try it now | ||
651 | */ | ||
652 | |||
653 | if(lp->mc_reload_wait) | ||
654 | { | ||
655 | mc32_reset_multicast_list(dev); | ||
656 | } | ||
657 | |||
658 | return ret; | ||
659 | } | ||
660 | |||
661 | |||
662 | /** | ||
663 | * mc32_start_transceiver - tell board to restart tx/rx | ||
664 | * @dev: The 3c527 card to issue the command to | ||
665 | * | ||
666 | * This may be called from the interrupt state, where it is used | ||
667 | * to restart the rx ring if the card runs out of rx buffers. | ||
668 | * | ||
669 | * We must first check if it's ok to (re)start the transceiver. See | ||
670 | * mc32_close for details. | ||
671 | */ | ||
672 | |||
673 | static void mc32_start_transceiver(struct net_device *dev) { | ||
674 | |||
675 | struct mc32_local *lp = netdev_priv(dev); | ||
676 | int ioaddr = dev->base_addr; | ||
677 | |||
678 | /* Ignore RX overflow on device closure */ | ||
679 | if (lp->xceiver_desired_state==HALTED) | ||
680 | return; | ||
681 | |||
682 | /* Give the card the offset to the post-EOL-bit RX descriptor */ | ||
683 | mc32_ready_poll(dev); | ||
684 | lp->rx_box->mbox=0; | ||
685 | lp->rx_box->data[0]=lp->rx_ring[prev_rx(lp->rx_ring_tail)].p->next; | ||
686 | outb(HOST_CMD_START_RX, ioaddr+HOST_CMD); | ||
687 | |||
688 | mc32_ready_poll(dev); | ||
689 | lp->tx_box->mbox=0; | ||
690 | outb(HOST_CMD_RESTRT_TX, ioaddr+HOST_CMD); /* card ignores this on RX restart */ | ||
691 | |||
692 | /* We are not interrupted on start completion */ | ||
693 | } | ||
694 | |||
695 | |||
696 | /** | ||
697 | * mc32_halt_transceiver - tell board to stop tx/rx | ||
698 | * @dev: The 3c527 card to issue the command to | ||
699 | * | ||
700 | * We issue the commands to halt the card's transceiver. In fact, | ||
701 | * after some experimenting we now simply tell the card to | ||
702 | * suspend. When issuing aborts occasionally odd things happened. | ||
703 | * | ||
704 | * We then sleep until the card has notified us that both rx and | ||
705 | * tx have been suspended. | ||
706 | */ | ||
707 | |||
708 | static void mc32_halt_transceiver(struct net_device *dev) | ||
709 | { | ||
710 | struct mc32_local *lp = netdev_priv(dev); | ||
711 | int ioaddr = dev->base_addr; | ||
712 | |||
713 | mc32_ready_poll(dev); | ||
714 | lp->rx_box->mbox=0; | ||
715 | outb(HOST_CMD_SUSPND_RX, ioaddr+HOST_CMD); | ||
716 | wait_for_completion(&lp->xceiver_cmd); | ||
717 | |||
718 | mc32_ready_poll(dev); | ||
719 | lp->tx_box->mbox=0; | ||
720 | outb(HOST_CMD_SUSPND_TX, ioaddr+HOST_CMD); | ||
721 | wait_for_completion(&lp->xceiver_cmd); | ||
722 | } | ||
723 | |||
724 | |||
725 | /** | ||
726 | * mc32_load_rx_ring - load the ring of receive buffers | ||
727 | * @dev: 3c527 to build the ring for | ||
728 | * | ||
729 | * This initalises the on-card and driver datastructures to | ||
730 | * the point where mc32_start_transceiver() can be called. | ||
731 | * | ||
732 | * The card sets up the receive ring for us. We are required to use the | ||
733 | * ring it provides, although the size of the ring is configurable. | ||
734 | * | ||
735 | * We allocate an sk_buff for each ring entry in turn and | ||
736 | * initalise its house-keeping info. At the same time, we read | ||
737 | * each 'next' pointer in our rx_ring array. This reduces slow | ||
738 | * shared-memory reads and makes it easy to access predecessor | ||
739 | * descriptors. | ||
740 | * | ||
741 | * We then set the end-of-list bit for the last entry so that the | ||
742 | * card will know when it has run out of buffers. | ||
743 | */ | ||
744 | |||
745 | static int mc32_load_rx_ring(struct net_device *dev) | ||
746 | { | ||
747 | struct mc32_local *lp = netdev_priv(dev); | ||
748 | int i; | ||
749 | u16 rx_base; | ||
750 | volatile struct skb_header *p; | ||
751 | |||
752 | rx_base=lp->rx_chain; | ||
753 | |||
754 | for(i=0; i<RX_RING_LEN; i++) { | ||
755 | lp->rx_ring[i].skb=alloc_skb(1532, GFP_KERNEL); | ||
756 | if (lp->rx_ring[i].skb==NULL) { | ||
757 | for (;i>=0;i--) | ||
758 | kfree_skb(lp->rx_ring[i].skb); | ||
759 | return -ENOBUFS; | ||
760 | } | ||
761 | skb_reserve(lp->rx_ring[i].skb, 18); | ||
762 | |||
763 | p=isa_bus_to_virt(lp->base+rx_base); | ||
764 | |||
765 | p->control=0; | ||
766 | p->data=isa_virt_to_bus(lp->rx_ring[i].skb->data); | ||
767 | p->status=0; | ||
768 | p->length=1532; | ||
769 | |||
770 | lp->rx_ring[i].p=p; | ||
771 | rx_base=p->next; | ||
772 | } | ||
773 | |||
774 | lp->rx_ring[i-1].p->control |= CONTROL_EOL; | ||
775 | |||
776 | lp->rx_ring_tail=0; | ||
777 | |||
778 | return 0; | ||
779 | } | ||
780 | |||
781 | |||
782 | /** | ||
783 | * mc32_flush_rx_ring - free the ring of receive buffers | ||
784 | * @lp: Local data of 3c527 to flush the rx ring of | ||
785 | * | ||
786 | * Free the buffer for each ring slot. This may be called | ||
787 | * before mc32_load_rx_ring(), eg. on error in mc32_open(). | ||
788 | * Requires rx skb pointers to point to a valid skb, or NULL. | ||
789 | */ | ||
790 | |||
791 | static void mc32_flush_rx_ring(struct net_device *dev) | ||
792 | { | ||
793 | struct mc32_local *lp = netdev_priv(dev); | ||
794 | int i; | ||
795 | |||
796 | for(i=0; i < RX_RING_LEN; i++) | ||
797 | { | ||
798 | if (lp->rx_ring[i].skb) { | ||
799 | dev_kfree_skb(lp->rx_ring[i].skb); | ||
800 | lp->rx_ring[i].skb = NULL; | ||
801 | } | ||
802 | lp->rx_ring[i].p=NULL; | ||
803 | } | ||
804 | } | ||
805 | |||
806 | |||
807 | /** | ||
808 | * mc32_load_tx_ring - load transmit ring | ||
809 | * @dev: The 3c527 card to issue the command to | ||
810 | * | ||
811 | * This sets up the host transmit data-structures. | ||
812 | * | ||
813 | * First, we obtain from the card it's current postion in the tx | ||
814 | * ring, so that we will know where to begin transmitting | ||
815 | * packets. | ||
816 | * | ||
817 | * Then, we read the 'next' pointers from the on-card tx ring into | ||
818 | * our tx_ring array to reduce slow shared-mem reads. Finally, we | ||
819 | * intitalise the tx house keeping variables. | ||
820 | * | ||
821 | */ | ||
822 | |||
823 | static void mc32_load_tx_ring(struct net_device *dev) | ||
824 | { | ||
825 | struct mc32_local *lp = netdev_priv(dev); | ||
826 | volatile struct skb_header *p; | ||
827 | int i; | ||
828 | u16 tx_base; | ||
829 | |||
830 | tx_base=lp->tx_box->data[0]; | ||
831 | |||
832 | for(i=0 ; i<TX_RING_LEN ; i++) | ||
833 | { | ||
834 | p=isa_bus_to_virt(lp->base+tx_base); | ||
835 | lp->tx_ring[i].p=p; | ||
836 | lp->tx_ring[i].skb=NULL; | ||
837 | |||
838 | tx_base=p->next; | ||
839 | } | ||
840 | |||
841 | /* -1 so that tx_ring_head cannot "lap" tx_ring_tail */ | ||
842 | /* see mc32_tx_ring */ | ||
843 | |||
844 | atomic_set(&lp->tx_count, TX_RING_LEN-1); | ||
845 | atomic_set(&lp->tx_ring_head, 0); | ||
846 | lp->tx_ring_tail=0; | ||
847 | } | ||
848 | |||
849 | |||
850 | /** | ||
851 | * mc32_flush_tx_ring - free transmit ring | ||
852 | * @lp: Local data of 3c527 to flush the tx ring of | ||
853 | * | ||
854 | * If the ring is non-empty, zip over the it, freeing any | ||
855 | * allocated skb_buffs. The tx ring house-keeping variables are | ||
856 | * then reset. Requires rx skb pointers to point to a valid skb, | ||
857 | * or NULL. | ||
858 | */ | ||
859 | |||
860 | static void mc32_flush_tx_ring(struct net_device *dev) | ||
861 | { | ||
862 | struct mc32_local *lp = netdev_priv(dev); | ||
863 | int i; | ||
864 | |||
865 | for (i=0; i < TX_RING_LEN; i++) | ||
866 | { | ||
867 | if (lp->tx_ring[i].skb) | ||
868 | { | ||
869 | dev_kfree_skb(lp->tx_ring[i].skb); | ||
870 | lp->tx_ring[i].skb = NULL; | ||
871 | } | ||
872 | } | ||
873 | |||
874 | atomic_set(&lp->tx_count, 0); | ||
875 | atomic_set(&lp->tx_ring_head, 0); | ||
876 | lp->tx_ring_tail=0; | ||
877 | } | ||
878 | |||
879 | |||
880 | /** | ||
881 | * mc32_open - handle 'up' of card | ||
882 | * @dev: device to open | ||
883 | * | ||
884 | * The user is trying to bring the card into ready state. This requires | ||
885 | * a brief dialogue with the card. Firstly we enable interrupts and then | ||
886 | * 'indications'. Without these enabled the card doesn't bother telling | ||
887 | * us what it has done. This had me puzzled for a week. | ||
888 | * | ||
889 | * We configure the number of card descriptors, then load the network | ||
890 | * address and multicast filters. Turn on the workaround mode. This | ||
891 | * works around a bug in the 82586 - it asks the firmware to do | ||
892 | * so. It has a performance (latency) hit but is needed on busy | ||
893 | * [read most] lans. We load the ring with buffers then we kick it | ||
894 | * all off. | ||
895 | */ | ||
896 | |||
897 | static int mc32_open(struct net_device *dev) | ||
898 | { | ||
899 | int ioaddr = dev->base_addr; | ||
900 | struct mc32_local *lp = netdev_priv(dev); | ||
901 | u8 one=1; | ||
902 | u8 regs; | ||
903 | u16 descnumbuffs[2] = {TX_RING_LEN, RX_RING_LEN}; | ||
904 | |||
905 | /* | ||
906 | * Interrupts enabled | ||
907 | */ | ||
908 | |||
909 | regs=inb(ioaddr+HOST_CTRL); | ||
910 | regs|=HOST_CTRL_INTE; | ||
911 | outb(regs, ioaddr+HOST_CTRL); | ||
912 | |||
913 | /* | ||
914 | * Allow ourselves to issue commands | ||
915 | */ | ||
916 | |||
917 | up(&lp->cmd_mutex); | ||
918 | |||
919 | |||
920 | /* | ||
921 | * Send the indications on command | ||
922 | */ | ||
923 | |||
924 | mc32_command(dev, 4, &one, 2); | ||
925 | |||
926 | /* | ||
927 | * Poke it to make sure it's really dead. | ||
928 | */ | ||
929 | |||
930 | mc32_halt_transceiver(dev); | ||
931 | mc32_flush_tx_ring(dev); | ||
932 | |||
933 | /* | ||
934 | * Ask card to set up on-card descriptors to our spec | ||
935 | */ | ||
936 | |||
937 | if(mc32_command(dev, 8, descnumbuffs, 4)) { | ||
938 | printk("%s: %s rejected our buffer configuration!\n", | ||
939 | dev->name, cardname); | ||
940 | mc32_close(dev); | ||
941 | return -ENOBUFS; | ||
942 | } | ||
943 | |||
944 | /* Report new configuration */ | ||
945 | mc32_command(dev, 6, NULL, 0); | ||
946 | |||
947 | lp->tx_chain = lp->exec_box->data[8]; /* Transmit list start offset */ | ||
948 | lp->rx_chain = lp->exec_box->data[10]; /* Receive list start offset */ | ||
949 | lp->tx_len = lp->exec_box->data[9]; /* Transmit list count */ | ||
950 | lp->rx_len = lp->exec_box->data[11]; /* Receive list count */ | ||
951 | |||
952 | /* Set Network Address */ | ||
953 | mc32_command(dev, 1, dev->dev_addr, 6); | ||
954 | |||
955 | /* Set the filters */ | ||
956 | mc32_set_multicast_list(dev); | ||
957 | |||
958 | if (WORKAROUND_82586) { | ||
959 | u16 zero_word=0; | ||
960 | mc32_command(dev, 0x0D, &zero_word, 2); /* 82586 bug workaround on */ | ||
961 | } | ||
962 | |||
963 | mc32_load_tx_ring(dev); | ||
964 | |||
965 | if(mc32_load_rx_ring(dev)) | ||
966 | { | ||
967 | mc32_close(dev); | ||
968 | return -ENOBUFS; | ||
969 | } | ||
970 | |||
971 | lp->xceiver_desired_state = RUNNING; | ||
972 | |||
973 | /* And finally, set the ball rolling... */ | ||
974 | mc32_start_transceiver(dev); | ||
975 | |||
976 | netif_start_queue(dev); | ||
977 | |||
978 | return 0; | ||
979 | } | ||
980 | |||
981 | |||
982 | /** | ||
983 | * mc32_timeout - handle a timeout from the network layer | ||
984 | * @dev: 3c527 that timed out | ||
985 | * | ||
986 | * Handle a timeout on transmit from the 3c527. This normally means | ||
987 | * bad things as the hardware handles cable timeouts and mess for | ||
988 | * us. | ||
989 | * | ||
990 | */ | ||
991 | |||
992 | static void mc32_timeout(struct net_device *dev) | ||
993 | { | ||
994 | printk(KERN_WARNING "%s: transmit timed out?\n", dev->name); | ||
995 | /* Try to restart the adaptor. */ | ||
996 | netif_wake_queue(dev); | ||
997 | } | ||
998 | |||
999 | |||
1000 | /** | ||
1001 | * mc32_send_packet - queue a frame for transmit | ||
1002 | * @skb: buffer to transmit | ||
1003 | * @dev: 3c527 to send it out of | ||
1004 | * | ||
1005 | * Transmit a buffer. This normally means throwing the buffer onto | ||
1006 | * the transmit queue as the queue is quite large. If the queue is | ||
1007 | * full then we set tx_busy and return. Once the interrupt handler | ||
1008 | * gets messages telling it to reclaim transmit queue entries, we will | ||
1009 | * clear tx_busy and the kernel will start calling this again. | ||
1010 | * | ||
1011 | * We do not disable interrupts or acquire any locks; this can | ||
1012 | * run concurrently with mc32_tx_ring(), and the function itself | ||
1013 | * is serialised at a higher layer. However, similarly for the | ||
1014 | * card itself, we must ensure that we update tx_ring_head only | ||
1015 | * after we've established a valid packet on the tx ring (and | ||
1016 | * before we let the card "see" it, to prevent it racing with the | ||
1017 | * irq handler). | ||
1018 | * | ||
1019 | */ | ||
1020 | |||
1021 | static int mc32_send_packet(struct sk_buff *skb, struct net_device *dev) | ||
1022 | { | ||
1023 | struct mc32_local *lp = netdev_priv(dev); | ||
1024 | u32 head = atomic_read(&lp->tx_ring_head); | ||
1025 | |||
1026 | volatile struct skb_header *p, *np; | ||
1027 | |||
1028 | netif_stop_queue(dev); | ||
1029 | |||
1030 | if(atomic_read(&lp->tx_count)==0) { | ||
1031 | return 1; | ||
1032 | } | ||
1033 | |||
1034 | skb = skb_padto(skb, ETH_ZLEN); | ||
1035 | if (skb == NULL) { | ||
1036 | netif_wake_queue(dev); | ||
1037 | return 0; | ||
1038 | } | ||
1039 | |||
1040 | atomic_dec(&lp->tx_count); | ||
1041 | |||
1042 | /* P is the last sending/sent buffer as a pointer */ | ||
1043 | p=lp->tx_ring[head].p; | ||
1044 | |||
1045 | head = next_tx(head); | ||
1046 | |||
1047 | /* NP is the buffer we will be loading */ | ||
1048 | np=lp->tx_ring[head].p; | ||
1049 | |||
1050 | /* We will need this to flush the buffer out */ | ||
1051 | lp->tx_ring[head].skb=skb; | ||
1052 | |||
1053 | np->length = unlikely(skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len; | ||
1054 | np->data = isa_virt_to_bus(skb->data); | ||
1055 | np->status = 0; | ||
1056 | np->control = CONTROL_EOP | CONTROL_EOL; | ||
1057 | wmb(); | ||
1058 | |||
1059 | /* | ||
1060 | * The new frame has been setup; we can now | ||
1061 | * let the interrupt handler and card "see" it | ||
1062 | */ | ||
1063 | |||
1064 | atomic_set(&lp->tx_ring_head, head); | ||
1065 | p->control &= ~CONTROL_EOL; | ||
1066 | |||
1067 | netif_wake_queue(dev); | ||
1068 | return 0; | ||
1069 | } | ||
1070 | |||
1071 | |||
1072 | /** | ||
1073 | * mc32_update_stats - pull off the on board statistics | ||
1074 | * @dev: 3c527 to service | ||
1075 | * | ||
1076 | * | ||
1077 | * Query and reset the on-card stats. There's the small possibility | ||
1078 | * of a race here, which would result in an underestimation of | ||
1079 | * actual errors. As such, we'd prefer to keep all our stats | ||
1080 | * collection in software. As a rule, we do. However it can't be | ||
1081 | * used for rx errors and collisions as, by default, the card discards | ||
1082 | * bad rx packets. | ||
1083 | * | ||
1084 | * Setting the SAV BP in the rx filter command supposedly | ||
1085 | * stops this behaviour. However, testing shows that it only seems to | ||
1086 | * enable the collation of on-card rx statistics --- the driver | ||
1087 | * never sees an RX descriptor with an error status set. | ||
1088 | * | ||
1089 | */ | ||
1090 | |||
1091 | static void mc32_update_stats(struct net_device *dev) | ||
1092 | { | ||
1093 | struct mc32_local *lp = netdev_priv(dev); | ||
1094 | volatile struct mc32_stats *st = lp->stats; | ||
1095 | |||
1096 | u32 rx_errors=0; | ||
1097 | |||
1098 | rx_errors+=lp->net_stats.rx_crc_errors +=st->rx_crc_errors; | ||
1099 | st->rx_crc_errors=0; | ||
1100 | rx_errors+=lp->net_stats.rx_fifo_errors +=st->rx_overrun_errors; | ||
1101 | st->rx_overrun_errors=0; | ||
1102 | rx_errors+=lp->net_stats.rx_frame_errors +=st->rx_alignment_errors; | ||
1103 | st->rx_alignment_errors=0; | ||
1104 | rx_errors+=lp->net_stats.rx_length_errors+=st->rx_tooshort_errors; | ||
1105 | st->rx_tooshort_errors=0; | ||
1106 | rx_errors+=lp->net_stats.rx_missed_errors+=st->rx_outofresource_errors; | ||
1107 | st->rx_outofresource_errors=0; | ||
1108 | lp->net_stats.rx_errors=rx_errors; | ||
1109 | |||
1110 | /* Number of packets which saw one collision */ | ||
1111 | lp->net_stats.collisions+=st->dataC[10]; | ||
1112 | st->dataC[10]=0; | ||
1113 | |||
1114 | /* Number of packets which saw 2--15 collisions */ | ||
1115 | lp->net_stats.collisions+=st->dataC[11]; | ||
1116 | st->dataC[11]=0; | ||
1117 | } | ||
1118 | |||
1119 | |||
1120 | /** | ||
1121 | * mc32_rx_ring - process the receive ring | ||
1122 | * @dev: 3c527 that needs its receive ring processing | ||
1123 | * | ||
1124 | * | ||
1125 | * We have received one or more indications from the card that a | ||
1126 | * receive has completed. The buffer ring thus contains dirty | ||
1127 | * entries. We walk the ring by iterating over the circular rx_ring | ||
1128 | * array, starting at the next dirty buffer (which happens to be the | ||
1129 | * one we finished up at last time around). | ||
1130 | * | ||
1131 | * For each completed packet, we will either copy it and pass it up | ||
1132 | * the stack or, if the packet is near MTU sized, we allocate | ||
1133 | * another buffer and flip the old one up the stack. | ||
1134 | * | ||
1135 | * We must succeed in keeping a buffer on the ring. If necessary we | ||
1136 | * will toss a received packet rather than lose a ring entry. Once | ||
1137 | * the first uncompleted descriptor is found, we move the | ||
1138 | * End-Of-List bit to include the buffers just processed. | ||
1139 | * | ||
1140 | */ | ||
1141 | |||
1142 | static void mc32_rx_ring(struct net_device *dev) | ||
1143 | { | ||
1144 | struct mc32_local *lp = netdev_priv(dev); | ||
1145 | volatile struct skb_header *p; | ||
1146 | u16 rx_ring_tail; | ||
1147 | u16 rx_old_tail; | ||
1148 | int x=0; | ||
1149 | |||
1150 | rx_old_tail = rx_ring_tail = lp->rx_ring_tail; | ||
1151 | |||
1152 | do | ||
1153 | { | ||
1154 | p=lp->rx_ring[rx_ring_tail].p; | ||
1155 | |||
1156 | if(!(p->status & (1<<7))) { /* Not COMPLETED */ | ||
1157 | break; | ||
1158 | } | ||
1159 | if(p->status & (1<<6)) /* COMPLETED_OK */ | ||
1160 | { | ||
1161 | |||
1162 | u16 length=p->length; | ||
1163 | struct sk_buff *skb; | ||
1164 | struct sk_buff *newskb; | ||
1165 | |||
1166 | /* Try to save time by avoiding a copy on big frames */ | ||
1167 | |||
1168 | if ((length > RX_COPYBREAK) | ||
1169 | && ((newskb=dev_alloc_skb(1532)) != NULL)) | ||
1170 | { | ||
1171 | skb=lp->rx_ring[rx_ring_tail].skb; | ||
1172 | skb_put(skb, length); | ||
1173 | |||
1174 | skb_reserve(newskb,18); | ||
1175 | lp->rx_ring[rx_ring_tail].skb=newskb; | ||
1176 | p->data=isa_virt_to_bus(newskb->data); | ||
1177 | } | ||
1178 | else | ||
1179 | { | ||
1180 | skb=dev_alloc_skb(length+2); | ||
1181 | |||
1182 | if(skb==NULL) { | ||
1183 | lp->net_stats.rx_dropped++; | ||
1184 | goto dropped; | ||
1185 | } | ||
1186 | |||
1187 | skb_reserve(skb,2); | ||
1188 | memcpy(skb_put(skb, length), | ||
1189 | lp->rx_ring[rx_ring_tail].skb->data, length); | ||
1190 | } | ||
1191 | |||
1192 | skb->protocol=eth_type_trans(skb,dev); | ||
1193 | skb->dev=dev; | ||
1194 | dev->last_rx = jiffies; | ||
1195 | lp->net_stats.rx_packets++; | ||
1196 | lp->net_stats.rx_bytes += length; | ||
1197 | netif_rx(skb); | ||
1198 | } | ||
1199 | |||
1200 | dropped: | ||
1201 | p->length = 1532; | ||
1202 | p->status = 0; | ||
1203 | |||
1204 | rx_ring_tail=next_rx(rx_ring_tail); | ||
1205 | } | ||
1206 | while(x++<48); | ||
1207 | |||
1208 | /* If there was actually a frame to be processed, place the EOL bit */ | ||
1209 | /* at the descriptor prior to the one to be filled next */ | ||
1210 | |||
1211 | if (rx_ring_tail != rx_old_tail) | ||
1212 | { | ||
1213 | lp->rx_ring[prev_rx(rx_ring_tail)].p->control |= CONTROL_EOL; | ||
1214 | lp->rx_ring[prev_rx(rx_old_tail)].p->control &= ~CONTROL_EOL; | ||
1215 | |||
1216 | lp->rx_ring_tail=rx_ring_tail; | ||
1217 | } | ||
1218 | } | ||
1219 | |||
1220 | |||
1221 | /** | ||
1222 | * mc32_tx_ring - process completed transmits | ||
1223 | * @dev: 3c527 that needs its transmit ring processing | ||
1224 | * | ||
1225 | * | ||
1226 | * This operates in a similar fashion to mc32_rx_ring. We iterate | ||
1227 | * over the transmit ring. For each descriptor which has been | ||
1228 | * processed by the card, we free its associated buffer and note | ||
1229 | * any errors. This continues until the transmit ring is emptied | ||
1230 | * or we reach a descriptor that hasn't yet been processed by the | ||
1231 | * card. | ||
1232 | * | ||
1233 | */ | ||
1234 | |||
1235 | static void mc32_tx_ring(struct net_device *dev) | ||
1236 | { | ||
1237 | struct mc32_local *lp = netdev_priv(dev); | ||
1238 | volatile struct skb_header *np; | ||
1239 | |||
1240 | /* | ||
1241 | * We rely on head==tail to mean 'queue empty'. | ||
1242 | * This is why lp->tx_count=TX_RING_LEN-1: in order to prevent | ||
1243 | * tx_ring_head wrapping to tail and confusing a 'queue empty' | ||
1244 | * condition with 'queue full' | ||
1245 | */ | ||
1246 | |||
1247 | while (lp->tx_ring_tail != atomic_read(&lp->tx_ring_head)) | ||
1248 | { | ||
1249 | u16 t; | ||
1250 | |||
1251 | t=next_tx(lp->tx_ring_tail); | ||
1252 | np=lp->tx_ring[t].p; | ||
1253 | |||
1254 | if(!(np->status & (1<<7))) | ||
1255 | { | ||
1256 | /* Not COMPLETED */ | ||
1257 | break; | ||
1258 | } | ||
1259 | lp->net_stats.tx_packets++; | ||
1260 | if(!(np->status & (1<<6))) /* Not COMPLETED_OK */ | ||
1261 | { | ||
1262 | lp->net_stats.tx_errors++; | ||
1263 | |||
1264 | switch(np->status&0x0F) | ||
1265 | { | ||
1266 | case 1: | ||
1267 | lp->net_stats.tx_aborted_errors++; | ||
1268 | break; /* Max collisions */ | ||
1269 | case 2: | ||
1270 | lp->net_stats.tx_fifo_errors++; | ||
1271 | break; | ||
1272 | case 3: | ||
1273 | lp->net_stats.tx_carrier_errors++; | ||
1274 | break; | ||
1275 | case 4: | ||
1276 | lp->net_stats.tx_window_errors++; | ||
1277 | break; /* CTS Lost */ | ||
1278 | case 5: | ||
1279 | lp->net_stats.tx_aborted_errors++; | ||
1280 | break; /* Transmit timeout */ | ||
1281 | } | ||
1282 | } | ||
1283 | /* Packets are sent in order - this is | ||
1284 | basically a FIFO queue of buffers matching | ||
1285 | the card ring */ | ||
1286 | lp->net_stats.tx_bytes+=lp->tx_ring[t].skb->len; | ||
1287 | dev_kfree_skb_irq(lp->tx_ring[t].skb); | ||
1288 | lp->tx_ring[t].skb=NULL; | ||
1289 | atomic_inc(&lp->tx_count); | ||
1290 | netif_wake_queue(dev); | ||
1291 | |||
1292 | lp->tx_ring_tail=t; | ||
1293 | } | ||
1294 | |||
1295 | } | ||
1296 | |||
1297 | |||
1298 | /** | ||
1299 | * mc32_interrupt - handle an interrupt from a 3c527 | ||
1300 | * @irq: Interrupt number | ||
1301 | * @dev_id: 3c527 that requires servicing | ||
1302 | * @regs: Registers (unused) | ||
1303 | * | ||
1304 | * | ||
1305 | * An interrupt is raised whenever the 3c527 writes to the command | ||
1306 | * register. This register contains the message it wishes to send us | ||
1307 | * packed into a single byte field. We keep reading status entries | ||
1308 | * until we have processed all the control items, but simply count | ||
1309 | * transmit and receive reports. When all reports are in we empty the | ||
1310 | * transceiver rings as appropriate. This saves the overhead of | ||
1311 | * multiple command requests. | ||
1312 | * | ||
1313 | * Because MCA is level-triggered, we shouldn't miss indications. | ||
1314 | * Therefore, we needn't ask the card to suspend interrupts within | ||
1315 | * this handler. The card receives an implicit acknowledgment of the | ||
1316 | * current interrupt when we read the command register. | ||
1317 | * | ||
1318 | */ | ||
1319 | |||
1320 | static irqreturn_t mc32_interrupt(int irq, void *dev_id, struct pt_regs * regs) | ||
1321 | { | ||
1322 | struct net_device *dev = dev_id; | ||
1323 | struct mc32_local *lp; | ||
1324 | int ioaddr, status, boguscount = 0; | ||
1325 | int rx_event = 0; | ||
1326 | int tx_event = 0; | ||
1327 | |||
1328 | if (dev == NULL) { | ||
1329 | printk(KERN_WARNING "%s: irq %d for unknown device.\n", cardname, irq); | ||
1330 | return IRQ_NONE; | ||
1331 | } | ||
1332 | |||
1333 | ioaddr = dev->base_addr; | ||
1334 | lp = netdev_priv(dev); | ||
1335 | |||
1336 | /* See whats cooking */ | ||
1337 | |||
1338 | while((inb(ioaddr+HOST_STATUS)&HOST_STATUS_CWR) && boguscount++<2000) | ||
1339 | { | ||
1340 | status=inb(ioaddr+HOST_CMD); | ||
1341 | |||
1342 | #ifdef DEBUG_IRQ | ||
1343 | printk("Status TX%d RX%d EX%d OV%d BC%d\n", | ||
1344 | (status&7), (status>>3)&7, (status>>6)&1, | ||
1345 | (status>>7)&1, boguscount); | ||
1346 | #endif | ||
1347 | |||
1348 | switch(status&7) | ||
1349 | { | ||
1350 | case 0: | ||
1351 | break; | ||
1352 | case 6: /* TX fail */ | ||
1353 | case 2: /* TX ok */ | ||
1354 | tx_event = 1; | ||
1355 | break; | ||
1356 | case 3: /* Halt */ | ||
1357 | case 4: /* Abort */ | ||
1358 | complete(&lp->xceiver_cmd); | ||
1359 | break; | ||
1360 | default: | ||
1361 | printk("%s: strange tx ack %d\n", dev->name, status&7); | ||
1362 | } | ||
1363 | status>>=3; | ||
1364 | switch(status&7) | ||
1365 | { | ||
1366 | case 0: | ||
1367 | break; | ||
1368 | case 2: /* RX */ | ||
1369 | rx_event=1; | ||
1370 | break; | ||
1371 | case 3: /* Halt */ | ||
1372 | case 4: /* Abort */ | ||
1373 | complete(&lp->xceiver_cmd); | ||
1374 | break; | ||
1375 | case 6: | ||
1376 | /* Out of RX buffers stat */ | ||
1377 | /* Must restart rx */ | ||
1378 | lp->net_stats.rx_dropped++; | ||
1379 | mc32_rx_ring(dev); | ||
1380 | mc32_start_transceiver(dev); | ||
1381 | break; | ||
1382 | default: | ||
1383 | printk("%s: strange rx ack %d\n", | ||
1384 | dev->name, status&7); | ||
1385 | } | ||
1386 | status>>=3; | ||
1387 | if(status&1) | ||
1388 | { | ||
1389 | /* | ||
1390 | * No thread is waiting: we need to tidy | ||
1391 | * up ourself. | ||
1392 | */ | ||
1393 | |||
1394 | if (lp->cmd_nonblocking) { | ||
1395 | up(&lp->cmd_mutex); | ||
1396 | if (lp->mc_reload_wait) | ||
1397 | mc32_reset_multicast_list(dev); | ||
1398 | } | ||
1399 | else complete(&lp->execution_cmd); | ||
1400 | } | ||
1401 | if(status&2) | ||
1402 | { | ||
1403 | /* | ||
1404 | * We get interrupted once per | ||
1405 | * counter that is about to overflow. | ||
1406 | */ | ||
1407 | |||
1408 | mc32_update_stats(dev); | ||
1409 | } | ||
1410 | } | ||
1411 | |||
1412 | |||
1413 | /* | ||
1414 | * Process the transmit and receive rings | ||
1415 | */ | ||
1416 | |||
1417 | if(tx_event) | ||
1418 | mc32_tx_ring(dev); | ||
1419 | |||
1420 | if(rx_event) | ||
1421 | mc32_rx_ring(dev); | ||
1422 | |||
1423 | return IRQ_HANDLED; | ||
1424 | } | ||
1425 | |||
1426 | |||
1427 | /** | ||
1428 | * mc32_close - user configuring the 3c527 down | ||
1429 | * @dev: 3c527 card to shut down | ||
1430 | * | ||
1431 | * The 3c527 is a bus mastering device. We must be careful how we | ||
1432 | * shut it down. It may also be running shared interrupt so we have | ||
1433 | * to be sure to silence it properly | ||
1434 | * | ||
1435 | * We indicate that the card is closing to the rest of the | ||
1436 | * driver. Otherwise, it is possible that the card may run out | ||
1437 | * of receive buffers and restart the transceiver while we're | ||
1438 | * trying to close it. | ||
1439 | * | ||
1440 | * We abort any receive and transmits going on and then wait until | ||
1441 | * any pending exec commands have completed in other code threads. | ||
1442 | * In theory we can't get here while that is true, in practice I am | ||
1443 | * paranoid | ||
1444 | * | ||
1445 | * We turn off the interrupt enable for the board to be sure it can't | ||
1446 | * intefere with other devices. | ||
1447 | */ | ||
1448 | |||
1449 | static int mc32_close(struct net_device *dev) | ||
1450 | { | ||
1451 | struct mc32_local *lp = netdev_priv(dev); | ||
1452 | int ioaddr = dev->base_addr; | ||
1453 | |||
1454 | u8 regs; | ||
1455 | u16 one=1; | ||
1456 | |||
1457 | lp->xceiver_desired_state = HALTED; | ||
1458 | netif_stop_queue(dev); | ||
1459 | |||
1460 | /* | ||
1461 | * Send the indications on command (handy debug check) | ||
1462 | */ | ||
1463 | |||
1464 | mc32_command(dev, 4, &one, 2); | ||
1465 | |||
1466 | /* Shut down the transceiver */ | ||
1467 | |||
1468 | mc32_halt_transceiver(dev); | ||
1469 | |||
1470 | /* Ensure we issue no more commands beyond this point */ | ||
1471 | |||
1472 | down(&lp->cmd_mutex); | ||
1473 | |||
1474 | /* Ok the card is now stopping */ | ||
1475 | |||
1476 | regs=inb(ioaddr+HOST_CTRL); | ||
1477 | regs&=~HOST_CTRL_INTE; | ||
1478 | outb(regs, ioaddr+HOST_CTRL); | ||
1479 | |||
1480 | mc32_flush_rx_ring(dev); | ||
1481 | mc32_flush_tx_ring(dev); | ||
1482 | |||
1483 | mc32_update_stats(dev); | ||
1484 | |||
1485 | return 0; | ||
1486 | } | ||
1487 | |||
1488 | |||
1489 | /** | ||
1490 | * mc32_get_stats - hand back stats to network layer | ||
1491 | * @dev: The 3c527 card to handle | ||
1492 | * | ||
1493 | * We've collected all the stats we can in software already. Now | ||
1494 | * it's time to update those kept on-card and return the lot. | ||
1495 | * | ||
1496 | */ | ||
1497 | |||
1498 | static struct net_device_stats *mc32_get_stats(struct net_device *dev) | ||
1499 | { | ||
1500 | struct mc32_local *lp = netdev_priv(dev); | ||
1501 | |||
1502 | mc32_update_stats(dev); | ||
1503 | return &lp->net_stats; | ||
1504 | } | ||
1505 | |||
1506 | |||
1507 | /** | ||
1508 | * do_mc32_set_multicast_list - attempt to update multicasts | ||
1509 | * @dev: 3c527 device to load the list on | ||
1510 | * @retry: indicates this is not the first call. | ||
1511 | * | ||
1512 | * | ||
1513 | * Actually set or clear the multicast filter for this adaptor. The | ||
1514 | * locking issues are handled by this routine. We have to track | ||
1515 | * state as it may take multiple calls to get the command sequence | ||
1516 | * completed. We just keep trying to schedule the loads until we | ||
1517 | * manage to process them all. | ||
1518 | * | ||
1519 | * num_addrs == -1 Promiscuous mode, receive all packets | ||
1520 | * | ||
1521 | * num_addrs == 0 Normal mode, clear multicast list | ||
1522 | * | ||
1523 | * num_addrs > 0 Multicast mode, receive normal and MC packets, | ||
1524 | * and do best-effort filtering. | ||
1525 | * | ||
1526 | * See mc32_update_stats() regards setting the SAV BP bit. | ||
1527 | * | ||
1528 | */ | ||
1529 | |||
1530 | static void do_mc32_set_multicast_list(struct net_device *dev, int retry) | ||
1531 | { | ||
1532 | struct mc32_local *lp = netdev_priv(dev); | ||
1533 | u16 filt = (1<<2); /* Save Bad Packets, for stats purposes */ | ||
1534 | |||
1535 | if (dev->flags&IFF_PROMISC) | ||
1536 | /* Enable promiscuous mode */ | ||
1537 | filt |= 1; | ||
1538 | else if((dev->flags&IFF_ALLMULTI) || dev->mc_count > 10) | ||
1539 | { | ||
1540 | dev->flags|=IFF_PROMISC; | ||
1541 | filt |= 1; | ||
1542 | } | ||
1543 | else if(dev->mc_count) | ||
1544 | { | ||
1545 | unsigned char block[62]; | ||
1546 | unsigned char *bp; | ||
1547 | struct dev_mc_list *dmc=dev->mc_list; | ||
1548 | |||
1549 | int i; | ||
1550 | |||
1551 | if(retry==0) | ||
1552 | lp->mc_list_valid = 0; | ||
1553 | if(!lp->mc_list_valid) | ||
1554 | { | ||
1555 | block[1]=0; | ||
1556 | block[0]=dev->mc_count; | ||
1557 | bp=block+2; | ||
1558 | |||
1559 | for(i=0;i<dev->mc_count;i++) | ||
1560 | { | ||
1561 | memcpy(bp, dmc->dmi_addr, 6); | ||
1562 | bp+=6; | ||
1563 | dmc=dmc->next; | ||
1564 | } | ||
1565 | if(mc32_command_nowait(dev, 2, block, 2+6*dev->mc_count)==-1) | ||
1566 | { | ||
1567 | lp->mc_reload_wait = 1; | ||
1568 | return; | ||
1569 | } | ||
1570 | lp->mc_list_valid=1; | ||
1571 | } | ||
1572 | } | ||
1573 | |||
1574 | if(mc32_command_nowait(dev, 0, &filt, 2)==-1) | ||
1575 | { | ||
1576 | lp->mc_reload_wait = 1; | ||
1577 | } | ||
1578 | else { | ||
1579 | lp->mc_reload_wait = 0; | ||
1580 | } | ||
1581 | } | ||
1582 | |||
1583 | |||
1584 | /** | ||
1585 | * mc32_set_multicast_list - queue multicast list update | ||
1586 | * @dev: The 3c527 to use | ||
1587 | * | ||
1588 | * Commence loading the multicast list. This is called when the kernel | ||
1589 | * changes the lists. It will override any pending list we are trying to | ||
1590 | * load. | ||
1591 | */ | ||
1592 | |||
1593 | static void mc32_set_multicast_list(struct net_device *dev) | ||
1594 | { | ||
1595 | do_mc32_set_multicast_list(dev,0); | ||
1596 | } | ||
1597 | |||
1598 | |||
1599 | /** | ||
1600 | * mc32_reset_multicast_list - reset multicast list | ||
1601 | * @dev: The 3c527 to use | ||
1602 | * | ||
1603 | * Attempt the next step in loading the multicast lists. If this attempt | ||
1604 | * fails to complete then it will be scheduled and this function called | ||
1605 | * again later from elsewhere. | ||
1606 | */ | ||
1607 | |||
1608 | static void mc32_reset_multicast_list(struct net_device *dev) | ||
1609 | { | ||
1610 | do_mc32_set_multicast_list(dev,1); | ||
1611 | } | ||
1612 | |||
1613 | static void netdev_get_drvinfo(struct net_device *dev, | ||
1614 | struct ethtool_drvinfo *info) | ||
1615 | { | ||
1616 | strcpy(info->driver, DRV_NAME); | ||
1617 | strcpy(info->version, DRV_VERSION); | ||
1618 | sprintf(info->bus_info, "MCA 0x%lx", dev->base_addr); | ||
1619 | } | ||
1620 | |||
1621 | static u32 netdev_get_msglevel(struct net_device *dev) | ||
1622 | { | ||
1623 | return mc32_debug; | ||
1624 | } | ||
1625 | |||
1626 | static void netdev_set_msglevel(struct net_device *dev, u32 level) | ||
1627 | { | ||
1628 | mc32_debug = level; | ||
1629 | } | ||
1630 | |||
1631 | static struct ethtool_ops netdev_ethtool_ops = { | ||
1632 | .get_drvinfo = netdev_get_drvinfo, | ||
1633 | .get_msglevel = netdev_get_msglevel, | ||
1634 | .set_msglevel = netdev_set_msglevel, | ||
1635 | }; | ||
1636 | |||
1637 | #ifdef MODULE | ||
1638 | |||
1639 | static struct net_device *this_device; | ||
1640 | |||
1641 | /** | ||
1642 | * init_module - entry point | ||
1643 | * | ||
1644 | * Probe and locate a 3c527 card. This really should probe and locate | ||
1645 | * all the 3c527 cards in the machine not just one of them. Yes you can | ||
1646 | * insmod multiple modules for now but it's a hack. | ||
1647 | */ | ||
1648 | |||
1649 | int init_module(void) | ||
1650 | { | ||
1651 | this_device = mc32_probe(-1); | ||
1652 | if (IS_ERR(this_device)) | ||
1653 | return PTR_ERR(this_device); | ||
1654 | return 0; | ||
1655 | } | ||
1656 | |||
1657 | /** | ||
1658 | * cleanup_module - free resources for an unload | ||
1659 | * | ||
1660 | * Unloading time. We release the MCA bus resources and the interrupt | ||
1661 | * at which point everything is ready to unload. The card must be stopped | ||
1662 | * at this point or we would not have been called. When we unload we | ||
1663 | * leave the card stopped but not totally shut down. When the card is | ||
1664 | * initialized it must be rebooted or the rings reloaded before any | ||
1665 | * transmit operations are allowed to start scribbling into memory. | ||
1666 | */ | ||
1667 | |||
1668 | void cleanup_module(void) | ||
1669 | { | ||
1670 | unregister_netdev(this_device); | ||
1671 | cleanup_card(this_device); | ||
1672 | free_netdev(this_device); | ||
1673 | } | ||
1674 | |||
1675 | #endif /* MODULE */ | ||