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