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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / net / lib82596.c
blobb59f442bbf36e38885e6bf35570fe7a5b9138104
1 /* lasi_82596.c -- driver for the intel 82596 ethernet controller, as
2 munged into HPPA boxen .
3
4 This driver is based upon 82596.c, original credits are below...
5 but there were too many hoops which HP wants jumped through to
6 keep this code in there in a sane manner.
7
8 3 primary sources of the mess --
9 1) hppa needs *lots* of cacheline flushing to keep this kind of
10 MMIO running.
11
12 2) The 82596 needs to see all of its pointers as their physical
13 address. Thus virt_to_bus/bus_to_virt are *everywhere*.
14
15 3) The implementation HP is using seems to be significantly pickier
16 about when and how the command and RX units are started. some
17 command ordering was changed.
18
19 Examination of the mach driver leads one to believe that there
20 might be a saner way to pull this off... anyone who feels like a
21 full rewrite can be my guest.
22
23 Split 02/13/2000 Sam Creasey (sammy@oh.verio.com)
24
25 02/01/2000 Initial modifications for parisc by Helge Deller (deller@gmx.de)
26 03/02/2000 changes for better/correct(?) cache-flushing (deller)
27 */
28
29 /* 82596.c: A generic 82596 ethernet driver for linux. */
30 /*
31 Based on Apricot.c
32 Written 1994 by Mark Evans.
33 This driver is for the Apricot 82596 bus-master interface
34
35 Modularised 12/94 Mark Evans
36
37
38 Modified to support the 82596 ethernet chips on 680x0 VME boards.
39 by Richard Hirst <richard@sleepie.demon.co.uk>
40 Renamed to be 82596.c
41
42 980825: Changed to receive directly in to sk_buffs which are
43 allocated at open() time. Eliminates copy on incoming frames
44 (small ones are still copied). Shared data now held in a
45 non-cached page, so we can run on 68060 in copyback mode.
46
47 TBD:
48 * look at deferring rx frames rather than discarding (as per tulip)
49 * handle tx ring full as per tulip
50 * performace test to tune rx_copybreak
51
52 Most of my modifications relate to the braindead big-endian
53 implementation by Intel. When the i596 is operating in
54 'big-endian' mode, it thinks a 32 bit value of 0x12345678
55 should be stored as 0x56781234. This is a real pain, when
56 you have linked lists which are shared by the 680x0 and the
57 i596.
58
59 Driver skeleton
60 Written 1993 by Donald Becker.
61 Copyright 1993 United States Government as represented by the Director,
62 National Security Agency. This software may only be used and distributed
63 according to the terms of the GNU General Public License as modified by SRC,
64 incorporated herein by reference.
65
66 The author may be reached as becker@scyld.com, or C/O
67 Scyld Computing Corporation, 410 Severn Ave., Suite 210, Annapolis MD 21403
68
69 */
70
71 #include <linux/module.h>
72 #include <linux/kernel.h>
73 #include <linux/string.h>
74 #include <linux/errno.h>
75 #include <linux/ioport.h>
76 #include <linux/slab.h>
77 #include <linux/interrupt.h>
78 #include <linux/delay.h>
79 #include <linux/netdevice.h>
80 #include <linux/etherdevice.h>
81 #include <linux/skbuff.h>
82 #include <linux/init.h>
83 #include <linux/types.h>
84 #include <linux/bitops.h>
85 #include <linux/dma-mapping.h>
86 #include <linux/io.h>
87 #include <linux/irq.h>
88
89 /* DEBUG flags
90 */
91
92 #define DEB_INIT 0x0001
93 #define DEB_PROBE 0x0002
94 #define DEB_SERIOUS 0x0004
95 #define DEB_ERRORS 0x0008
96 #define DEB_MULTI 0x0010
97 #define DEB_TDR 0x0020
98 #define DEB_OPEN 0x0040
99 #define DEB_RESET 0x0080
100 #define DEB_ADDCMD 0x0100
101 #define DEB_STATUS 0x0200
102 #define DEB_STARTTX 0x0400
103 #define DEB_RXADDR 0x0800
104 #define DEB_TXADDR 0x1000
105 #define DEB_RXFRAME 0x2000
106 #define DEB_INTS 0x4000
107 #define DEB_STRUCT 0x8000
108 #define DEB_ANY 0xffff
109
110
111 #define DEB(x, y) if (i596_debug & (x)) { y; }
112
113
114 /*
115 * The MPU_PORT command allows direct access to the 82596. With PORT access
116 * the following commands are available (p5-18). The 32-bit port command
117 * must be word-swapped with the most significant word written first.
118 * This only applies to VME boards.
119 */
120 #define PORT_RESET 0x00 /* reset 82596 */
121 #define PORT_SELFTEST 0x01 /* selftest */
122 #define PORT_ALTSCP 0x02 /* alternate SCB address */
123 #define PORT_ALTDUMP 0x03 /* Alternate DUMP address */
124
125 static int i596_debug = (DEB_SERIOUS|DEB_PROBE);
126
127 /* Copy frames shorter than rx_copybreak, otherwise pass on up in
128 * a full sized sk_buff. Value of 100 stolen from tulip.c (!alpha).
129 */
130 static int rx_copybreak = 100;
131
132 #define PKT_BUF_SZ 1536
133 #define MAX_MC_CNT 64
134
135 #define ISCP_BUSY 0x0001
136
137 #define I596_NULL ((u32)0xffffffff)
138
139 #define CMD_EOL 0x8000 /* The last command of the list, stop. */
140 #define CMD_SUSP 0x4000 /* Suspend after doing cmd. */
141 #define CMD_INTR 0x2000 /* Interrupt after doing cmd. */
142
143 #define CMD_FLEX 0x0008 /* Enable flexible memory model */
144
145 enum commands {
146 CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
147 CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7
148 };
149
150 #define STAT_C 0x8000 /* Set to 0 after execution */
151 #define STAT_B 0x4000 /* Command being executed */
152 #define STAT_OK 0x2000 /* Command executed ok */
153 #define STAT_A 0x1000 /* Command aborted */
154
155 #define CUC_START 0x0100
156 #define CUC_RESUME 0x0200
157 #define CUC_SUSPEND 0x0300
158 #define CUC_ABORT 0x0400
159 #define RX_START 0x0010
160 #define RX_RESUME 0x0020
161 #define RX_SUSPEND 0x0030
162 #define RX_ABORT 0x0040
163
164 #define TX_TIMEOUT 5
165
166
167 struct i596_reg {
168 unsigned short porthi;
169 unsigned short portlo;
170 u32 ca;
171 };
172
173 #define EOF 0x8000
174 #define SIZE_MASK 0x3fff
175
176 struct i596_tbd {
177 unsigned short size;
178 unsigned short pad;
179 u32 next;
180 u32 data;
181 u32 cache_pad[5]; /* Total 32 bytes... */
182 };
183
184 /* The command structure has two 'next' pointers; v_next is the address of
185 * the next command as seen by the CPU, b_next is the address of the next
186 * command as seen by the 82596. The b_next pointer, as used by the 82596
187 * always references the status field of the next command, rather than the
188 * v_next field, because the 82596 is unaware of v_next. It may seem more
189 * logical to put v_next at the end of the structure, but we cannot do that
190 * because the 82596 expects other fields to be there, depending on command
191 * type.
192 */
193
194 struct i596_cmd {
195 struct i596_cmd *v_next; /* Address from CPUs viewpoint */
196 unsigned short status;
197 unsigned short command;
198 u32 b_next; /* Address from i596 viewpoint */
199 };
200
201 struct tx_cmd {
202 struct i596_cmd cmd;
203 u32 tbd;
204 unsigned short size;
205 unsigned short pad;
206 struct sk_buff *skb; /* So we can free it after tx */
207 dma_addr_t dma_addr;
208 #ifdef __LP64__
209 u32 cache_pad[6]; /* Total 64 bytes... */
210 #else
211 u32 cache_pad[1]; /* Total 32 bytes... */
212 #endif
213 };
214
215 struct tdr_cmd {
216 struct i596_cmd cmd;
217 unsigned short status;
218 unsigned short pad;
219 };
220
221 struct mc_cmd {
222 struct i596_cmd cmd;
223 short mc_cnt;
224 char mc_addrs[MAX_MC_CNT*6];
225 };
226
227 struct sa_cmd {
228 struct i596_cmd cmd;
229 char eth_addr[8];
230 };
231
232 struct cf_cmd {
233 struct i596_cmd cmd;
234 char i596_config[16];
235 };
236
237 struct i596_rfd {
238 unsigned short stat;
239 unsigned short cmd;
240 u32 b_next; /* Address from i596 viewpoint */
241 u32 rbd;
242 unsigned short count;
243 unsigned short size;
244 struct i596_rfd *v_next; /* Address from CPUs viewpoint */
245 struct i596_rfd *v_prev;
246 #ifndef __LP64__
247 u32 cache_pad[2]; /* Total 32 bytes... */
248 #endif
249 };
250
251 struct i596_rbd {
252 /* hardware data */
253 unsigned short count;
254 unsigned short zero1;
255 u32 b_next;
256 u32 b_data; /* Address from i596 viewpoint */
257 unsigned short size;
258 unsigned short zero2;
259 /* driver data */
260 struct sk_buff *skb;
261 struct i596_rbd *v_next;
262 u32 b_addr; /* This rbd addr from i596 view */
263 unsigned char *v_data; /* Address from CPUs viewpoint */
264 /* Total 32 bytes... */
265 #ifdef __LP64__
266 u32 cache_pad[4];
267 #endif
268 };
269
270 /* These values as chosen so struct i596_dma fits in one page... */
271
272 #define TX_RING_SIZE 32
273 #define RX_RING_SIZE 16
274
275 struct i596_scb {
276 unsigned short status;
277 unsigned short command;
278 u32 cmd;
279 u32 rfd;
280 u32 crc_err;
281 u32 align_err;
282 u32 resource_err;
283 u32 over_err;
284 u32 rcvdt_err;
285 u32 short_err;
286 unsigned short t_on;
287 unsigned short t_off;
288 };
289
290 struct i596_iscp {
291 u32 stat;
292 u32 scb;
293 };
294
295 struct i596_scp {
296 u32 sysbus;
297 u32 pad;
298 u32 iscp;
299 };
300
301 struct i596_dma {
302 struct i596_scp scp __attribute__((aligned(32)));
303 volatile struct i596_iscp iscp __attribute__((aligned(32)));
304 volatile struct i596_scb scb __attribute__((aligned(32)));
305 struct sa_cmd sa_cmd __attribute__((aligned(32)));
306 struct cf_cmd cf_cmd __attribute__((aligned(32)));
307 struct tdr_cmd tdr_cmd __attribute__((aligned(32)));
308 struct mc_cmd mc_cmd __attribute__((aligned(32)));
309 struct i596_rfd rfds[RX_RING_SIZE] __attribute__((aligned(32)));
310 struct i596_rbd rbds[RX_RING_SIZE] __attribute__((aligned(32)));
311 struct tx_cmd tx_cmds[TX_RING_SIZE] __attribute__((aligned(32)));
312 struct i596_tbd tbds[TX_RING_SIZE] __attribute__((aligned(32)));
313 };
314
315 struct i596_private {
316 struct i596_dma *dma;
317 u32 stat;
318 int last_restart;
319 struct i596_rfd *rfd_head;
320 struct i596_rbd *rbd_head;
321 struct i596_cmd *cmd_tail;
322 struct i596_cmd *cmd_head;
323 int cmd_backlog;
324 u32 last_cmd;
325 int next_tx_cmd;
326 int options;
327 spinlock_t lock; /* serialize access to chip */
328 dma_addr_t dma_addr;
329 void __iomem *mpu_port;
330 void __iomem *ca;
331 };
332
333 static const char init_setup[] =
334 {
335 0x8E, /* length, prefetch on */
336 0xC8, /* fifo to 8, monitor off */
337 0x80, /* don't save bad frames */
338 0x2E, /* No source address insertion, 8 byte preamble */
339 0x00, /* priority and backoff defaults */
340 0x60, /* interframe spacing */
341 0x00, /* slot time LSB */
342 0xf2, /* slot time and retries */
343 0x00, /* promiscuous mode */
344 0x00, /* collision detect */
345 0x40, /* minimum frame length */
346 0xff,
347 0x00,
348 0x7f /* *multi IA */ };
349
350 static int i596_open(struct net_device *dev);
351 static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev);
352 static irqreturn_t i596_interrupt(int irq, void *dev_id);
353 static int i596_close(struct net_device *dev);
354 static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd);
355 static void i596_tx_timeout (struct net_device *dev);
356 static void print_eth(unsigned char *buf, char *str);
357 static void set_multicast_list(struct net_device *dev);
358 static inline void ca(struct net_device *dev);
359 static void mpu_port(struct net_device *dev, int c, dma_addr_t x);
360
361 static int rx_ring_size = RX_RING_SIZE;
362 static int ticks_limit = 100;
363 static int max_cmd_backlog = TX_RING_SIZE-1;
364
365 #ifdef CONFIG_NET_POLL_CONTROLLER
366 static void i596_poll_controller(struct net_device *dev);
367 #endif
368
369
370 static inline int wait_istat(struct net_device *dev, struct i596_dma *dma, int delcnt, char *str)
371 {
372 DMA_INV(dev, &(dma->iscp), sizeof(struct i596_iscp));
373 while (--delcnt && dma->iscp.stat) {
374 udelay(10);
375 DMA_INV(dev, &(dma->iscp), sizeof(struct i596_iscp));
376 }
377 if (!delcnt) {
378 printk(KERN_ERR "%s: %s, iscp.stat %04x, didn't clear\n",
379 dev->name, str, SWAP16(dma->iscp.stat));
380 return -1;
381 } else
382 return 0;
383 }
384
385
386 static inline int wait_cmd(struct net_device *dev, struct i596_dma *dma, int delcnt, char *str)
387 {
388 DMA_INV(dev, &(dma->scb), sizeof(struct i596_scb));
389 while (--delcnt && dma->scb.command) {
390 udelay(10);
391 DMA_INV(dev, &(dma->scb), sizeof(struct i596_scb));
392 }
393 if (!delcnt) {
394 printk(KERN_ERR "%s: %s, status %4.4x, cmd %4.4x.\n",
395 dev->name, str,
396 SWAP16(dma->scb.status),
397 SWAP16(dma->scb.command));
398 return -1;
399 } else
400 return 0;
401 }
402
403
404 static void i596_display_data(struct net_device *dev)
405 {
406 struct i596_private *lp = netdev_priv(dev);
407 struct i596_dma *dma = lp->dma;
408 struct i596_cmd *cmd;
409 struct i596_rfd *rfd;
410 struct i596_rbd *rbd;
411
412 printk(KERN_DEBUG "lp and scp at %p, .sysbus = %08x, .iscp = %08x\n",
413 &dma->scp, dma->scp.sysbus, SWAP32(dma->scp.iscp));
414 printk(KERN_DEBUG "iscp at %p, iscp.stat = %08x, .scb = %08x\n",
415 &dma->iscp, SWAP32(dma->iscp.stat), SWAP32(dma->iscp.scb));
416 printk(KERN_DEBUG "scb at %p, scb.status = %04x, .command = %04x,"
417 " .cmd = %08x, .rfd = %08x\n",
418 &dma->scb, SWAP16(dma->scb.status), SWAP16(dma->scb.command),
419 SWAP16(dma->scb.cmd), SWAP32(dma->scb.rfd));
420 printk(KERN_DEBUG " errors: crc %x, align %x, resource %x,"
421 " over %x, rcvdt %x, short %x\n",
422 SWAP32(dma->scb.crc_err), SWAP32(dma->scb.align_err),
423 SWAP32(dma->scb.resource_err), SWAP32(dma->scb.over_err),
424 SWAP32(dma->scb.rcvdt_err), SWAP32(dma->scb.short_err));
425 cmd = lp->cmd_head;
426 while (cmd != NULL) {
427 printk(KERN_DEBUG
428 "cmd at %p, .status = %04x, .command = %04x,"
429 " .b_next = %08x\n",
430 cmd, SWAP16(cmd->status), SWAP16(cmd->command),
431 SWAP32(cmd->b_next));
432 cmd = cmd->v_next;
433 }
434 rfd = lp->rfd_head;
435 printk(KERN_DEBUG "rfd_head = %p\n", rfd);
436 do {
437 printk(KERN_DEBUG
438 " %p .stat %04x, .cmd %04x, b_next %08x, rbd %08x,"
439 " count %04x\n",
440 rfd, SWAP16(rfd->stat), SWAP16(rfd->cmd),
441 SWAP32(rfd->b_next), SWAP32(rfd->rbd),
442 SWAP16(rfd->count));
443 rfd = rfd->v_next;
444 } while (rfd != lp->rfd_head);
445 rbd = lp->rbd_head;
446 printk(KERN_DEBUG "rbd_head = %p\n", rbd);
447 do {
448 printk(KERN_DEBUG
449 " %p .count %04x, b_next %08x, b_data %08x,"
450 " size %04x\n",
451 rbd, SWAP16(rbd->count), SWAP32(rbd->b_next),
452 SWAP32(rbd->b_data), SWAP16(rbd->size));
453 rbd = rbd->v_next;
454 } while (rbd != lp->rbd_head);
455 DMA_INV(dev, dma, sizeof(struct i596_dma));
456 }
457
458
459 #define virt_to_dma(lp, v) ((lp)->dma_addr + (dma_addr_t)((unsigned long)(v)-(unsigned long)((lp)->dma)))
460
461 static inline int init_rx_bufs(struct net_device *dev)
462 {
463 struct i596_private *lp = netdev_priv(dev);
464 struct i596_dma *dma = lp->dma;
465 int i;
466 struct i596_rfd *rfd;
467 struct i596_rbd *rbd;
468
469 /* First build the Receive Buffer Descriptor List */
470
471 for (i = 0, rbd = dma->rbds; i < rx_ring_size; i++, rbd++) {
472 dma_addr_t dma_addr;
473 struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ + 4);
474
475 if (skb == NULL)
476 return -1;
477 skb_reserve(skb, 2);
478 dma_addr = dma_map_single(dev->dev.parent, skb->data,
479 PKT_BUF_SZ, DMA_FROM_DEVICE);
480 rbd->v_next = rbd+1;
481 rbd->b_next = SWAP32(virt_to_dma(lp, rbd+1));
482 rbd->b_addr = SWAP32(virt_to_dma(lp, rbd));
483 rbd->skb = skb;
484 rbd->v_data = skb->data;
485 rbd->b_data = SWAP32(dma_addr);
486 rbd->size = SWAP16(PKT_BUF_SZ);
487 }
488 lp->rbd_head = dma->rbds;
489 rbd = dma->rbds + rx_ring_size - 1;
490 rbd->v_next = dma->rbds;
491 rbd->b_next = SWAP32(virt_to_dma(lp, dma->rbds));
492
493 /* Now build the Receive Frame Descriptor List */
494
495 for (i = 0, rfd = dma->rfds; i < rx_ring_size; i++, rfd++) {
496 rfd->rbd = I596_NULL;
497 rfd->v_next = rfd+1;
498 rfd->v_prev = rfd-1;
499 rfd->b_next = SWAP32(virt_to_dma(lp, rfd+1));
500 rfd->cmd = SWAP16(CMD_FLEX);
501 }
502 lp->rfd_head = dma->rfds;
503 dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
504 rfd = dma->rfds;
505 rfd->rbd = SWAP32(virt_to_dma(lp, lp->rbd_head));
506 rfd->v_prev = dma->rfds + rx_ring_size - 1;
507 rfd = dma->rfds + rx_ring_size - 1;
508 rfd->v_next = dma->rfds;
509 rfd->b_next = SWAP32(virt_to_dma(lp, dma->rfds));
510 rfd->cmd = SWAP16(CMD_EOL|CMD_FLEX);
511
512 DMA_WBACK_INV(dev, dma, sizeof(struct i596_dma));
513 return 0;
514 }
515
516 static inline void remove_rx_bufs(struct net_device *dev)
517 {
518 struct i596_private *lp = netdev_priv(dev);
519 struct i596_rbd *rbd;
520 int i;
521
522 for (i = 0, rbd = lp->dma->rbds; i < rx_ring_size; i++, rbd++) {
523 if (rbd->skb == NULL)
524 break;
525 dma_unmap_single(dev->dev.parent,
526 (dma_addr_t)SWAP32(rbd->b_data),
527 PKT_BUF_SZ, DMA_FROM_DEVICE);
528 dev_kfree_skb(rbd->skb);
529 }
530 }
531
532
533 static void rebuild_rx_bufs(struct net_device *dev)
534 {
535 struct i596_private *lp = netdev_priv(dev);
536 struct i596_dma *dma = lp->dma;
537 int i;
538
539 /* Ensure rx frame/buffer descriptors are tidy */
540
541 for (i = 0; i < rx_ring_size; i++) {
542 dma->rfds[i].rbd = I596_NULL;
543 dma->rfds[i].cmd = SWAP16(CMD_FLEX);
544 }
545 dma->rfds[rx_ring_size-1].cmd = SWAP16(CMD_EOL|CMD_FLEX);
546 lp->rfd_head = dma->rfds;
547 dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
548 lp->rbd_head = dma->rbds;
549 dma->rfds[0].rbd = SWAP32(virt_to_dma(lp, dma->rbds));
550
551 DMA_WBACK_INV(dev, dma, sizeof(struct i596_dma));
552 }
553
554
555 static int init_i596_mem(struct net_device *dev)
556 {
557 struct i596_private *lp = netdev_priv(dev);
558 struct i596_dma *dma = lp->dma;
559 unsigned long flags;
560
561 mpu_port(dev, PORT_RESET, 0);
562 udelay(100); /* Wait 100us - seems to help */
563
564 /* change the scp address */
565
566 lp->last_cmd = jiffies;
567
568 dma->scp.sysbus = SYSBUS;
569 dma->scp.iscp = SWAP32(virt_to_dma(lp, &(dma->iscp)));
570 dma->iscp.scb = SWAP32(virt_to_dma(lp, &(dma->scb)));
571 dma->iscp.stat = SWAP32(ISCP_BUSY);
572 lp->cmd_backlog = 0;
573
574 lp->cmd_head = NULL;
575 dma->scb.cmd = I596_NULL;
576
577 DEB(DEB_INIT, printk(KERN_DEBUG "%s: starting i82596.\n", dev->name));
578
579 DMA_WBACK(dev, &(dma->scp), sizeof(struct i596_scp));
580 DMA_WBACK(dev, &(dma->iscp), sizeof(struct i596_iscp));
581 DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
582
583 mpu_port(dev, PORT_ALTSCP, virt_to_dma(lp, &dma->scp));
584 ca(dev);
585 if (wait_istat(dev, dma, 1000, "initialization timed out"))
586 goto failed;
587 DEB(DEB_INIT, printk(KERN_DEBUG
588 "%s: i82596 initialization successful\n",
589 dev->name));
590
591 if (request_irq(dev->irq, &i596_interrupt, 0, "i82596", dev)) {
592 printk(KERN_ERR "%s: IRQ %d not free\n", dev->name, dev->irq);
593 goto failed;
594 }
595
596 /* Ensure rx frame/buffer descriptors are tidy */
597 rebuild_rx_bufs(dev);
598
599 dma->scb.command = 0;
600 DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
601
602 DEB(DEB_INIT, printk(KERN_DEBUG
603 "%s: queuing CmdConfigure\n", dev->name));
604 memcpy(dma->cf_cmd.i596_config, init_setup, 14);
605 dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
606 DMA_WBACK(dev, &(dma->cf_cmd), sizeof(struct cf_cmd));
607 i596_add_cmd(dev, &dma->cf_cmd.cmd);
608
609 DEB(DEB_INIT, printk(KERN_DEBUG "%s: queuing CmdSASetup\n", dev->name));
610 memcpy(dma->sa_cmd.eth_addr, dev->dev_addr, 6);
611 dma->sa_cmd.cmd.command = SWAP16(CmdSASetup);
612 DMA_WBACK(dev, &(dma->sa_cmd), sizeof(struct sa_cmd));
613 i596_add_cmd(dev, &dma->sa_cmd.cmd);
614
615 DEB(DEB_INIT, printk(KERN_DEBUG "%s: queuing CmdTDR\n", dev->name));
616 dma->tdr_cmd.cmd.command = SWAP16(CmdTDR);
617 DMA_WBACK(dev, &(dma->tdr_cmd), sizeof(struct tdr_cmd));
618 i596_add_cmd(dev, &dma->tdr_cmd.cmd);
619
620 spin_lock_irqsave (&lp->lock, flags);
621
622 if (wait_cmd(dev, dma, 1000, "timed out waiting to issue RX_START")) {
623 spin_unlock_irqrestore (&lp->lock, flags);
624 goto failed_free_irq;
625 }
626 DEB(DEB_INIT, printk(KERN_DEBUG "%s: Issuing RX_START\n", dev->name));
627 dma->scb.command = SWAP16(RX_START);
628 dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
629 DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
630
631 ca(dev);
632
633 spin_unlock_irqrestore (&lp->lock, flags);
634 if (wait_cmd(dev, dma, 1000, "RX_START not processed"))
635 goto failed_free_irq;
636 DEB(DEB_INIT, printk(KERN_DEBUG
637 "%s: Receive unit started OK\n", dev->name));
638 return 0;
639
640 failed_free_irq:
641 free_irq(dev->irq, dev);
642 failed:
643 printk(KERN_ERR "%s: Failed to initialise 82596\n", dev->name);
644 mpu_port(dev, PORT_RESET, 0);
645 return -1;
646 }
647
648
649 static inline int i596_rx(struct net_device *dev)
650 {
651 struct i596_private *lp = netdev_priv(dev);
652 struct i596_rfd *rfd;
653 struct i596_rbd *rbd;
654 int frames = 0;
655
656 DEB(DEB_RXFRAME, printk(KERN_DEBUG
657 "i596_rx(), rfd_head %p, rbd_head %p\n",
658 lp->rfd_head, lp->rbd_head));
659
660
661 rfd = lp->rfd_head; /* Ref next frame to check */
662
663 DMA_INV(dev, rfd, sizeof(struct i596_rfd));
664 while (rfd->stat & SWAP16(STAT_C)) { /* Loop while complete frames */
665 if (rfd->rbd == I596_NULL)
666 rbd = NULL;
667 else if (rfd->rbd == lp->rbd_head->b_addr) {
668 rbd = lp->rbd_head;
669 DMA_INV(dev, rbd, sizeof(struct i596_rbd));
670 } else {
671 printk(KERN_ERR "%s: rbd chain broken!\n", dev->name);
672 /* XXX Now what? */
673 rbd = NULL;
674 }
675 DEB(DEB_RXFRAME, printk(KERN_DEBUG
676 " rfd %p, rfd.rbd %08x, rfd.stat %04x\n",
677 rfd, rfd->rbd, rfd->stat));
678
679 if (rbd != NULL && (rfd->stat & SWAP16(STAT_OK))) {
680 /* a good frame */
681 int pkt_len = SWAP16(rbd->count) & 0x3fff;
682 struct sk_buff *skb = rbd->skb;
683 int rx_in_place = 0;
684
685 DEB(DEB_RXADDR, print_eth(rbd->v_data, "received"));
686 frames++;
687
688 /* Check if the packet is long enough to just accept
689 * without copying to a properly sized skbuff.
690 */
691
692 if (pkt_len > rx_copybreak) {
693 struct sk_buff *newskb;
694 dma_addr_t dma_addr;
695
696 dma_unmap_single(dev->dev.parent,
697 (dma_addr_t)SWAP32(rbd->b_data),
698 PKT_BUF_SZ, DMA_FROM_DEVICE);
699 /* Get fresh skbuff to replace filled one. */
700 newskb = netdev_alloc_skb(dev, PKT_BUF_SZ + 4);
701 if (newskb == NULL) {
702 skb = NULL; /* drop pkt */
703 goto memory_squeeze;
704 }
705 skb_reserve(newskb, 2);
706
707 /* Pass up the skb already on the Rx ring. */
708 skb_put(skb, pkt_len);
709 rx_in_place = 1;
710 rbd->skb = newskb;
711 dma_addr = dma_map_single(dev->dev.parent,
712 newskb->data,
713 PKT_BUF_SZ,
714 DMA_FROM_DEVICE);
715 rbd->v_data = newskb->data;
716 rbd->b_data = SWAP32(dma_addr);
717 DMA_WBACK_INV(dev, rbd, sizeof(struct i596_rbd));
718 } else
719 skb = netdev_alloc_skb(dev, pkt_len + 2);
720 memory_squeeze:
721 if (skb == NULL) {
722 /* XXX tulip.c can defer packets here!! */
723 printk(KERN_ERR
724 "%s: i596_rx Memory squeeze, dropping packet.\n",
725 dev->name);
726 dev->stats.rx_dropped++;
727 } else {
728 if (!rx_in_place) {
729 /* 16 byte align the data fields */
730 dma_sync_single_for_cpu(dev->dev.parent,
731 (dma_addr_t)SWAP32(rbd->b_data),
732 PKT_BUF_SZ, DMA_FROM_DEVICE);
733 skb_reserve(skb, 2);
734 memcpy(skb_put(skb, pkt_len), rbd->v_data, pkt_len);
735 dma_sync_single_for_device(dev->dev.parent,
736 (dma_addr_t)SWAP32(rbd->b_data),
737 PKT_BUF_SZ, DMA_FROM_DEVICE);
738 }
739 skb->len = pkt_len;
740 skb->protocol = eth_type_trans(skb, dev);
741 netif_rx(skb);
742 dev->last_rx = jiffies;
743 dev->stats.rx_packets++;
744 dev->stats.rx_bytes += pkt_len;
745 }
746 } else {
747 DEB(DEB_ERRORS, printk(KERN_DEBUG
748 "%s: Error, rfd.stat = 0x%04x\n",
749 dev->name, rfd->stat));
750 dev->stats.rx_errors++;
751 if (rfd->stat & SWAP16(0x0100))
752 dev->stats.collisions++;
753 if (rfd->stat & SWAP16(0x8000))
754 dev->stats.rx_length_errors++;
755 if (rfd->stat & SWAP16(0x0001))
756 dev->stats.rx_over_errors++;
757 if (rfd->stat & SWAP16(0x0002))
758 dev->stats.rx_fifo_errors++;
759 if (rfd->stat & SWAP16(0x0004))
760 dev->stats.rx_frame_errors++;
761 if (rfd->stat & SWAP16(0x0008))
762 dev->stats.rx_crc_errors++;
763 if (rfd->stat & SWAP16(0x0010))
764 dev->stats.rx_length_errors++;
765 }
766
767 /* Clear the buffer descriptor count and EOF + F flags */
768
769 if (rbd != NULL && (rbd->count & SWAP16(0x4000))) {
770 rbd->count = 0;
771 lp->rbd_head = rbd->v_next;
772 DMA_WBACK_INV(dev, rbd, sizeof(struct i596_rbd));
773 }
774
775 /* Tidy the frame descriptor, marking it as end of list */
776
777 rfd->rbd = I596_NULL;
778 rfd->stat = 0;
779 rfd->cmd = SWAP16(CMD_EOL|CMD_FLEX);
780 rfd->count = 0;
781
782 /* Update record of next frame descriptor to process */
783
784 lp->dma->scb.rfd = rfd->b_next;
785 lp->rfd_head = rfd->v_next;
786 DMA_WBACK_INV(dev, rfd, sizeof(struct i596_rfd));
787
788 /* Remove end-of-list from old end descriptor */
789
790 rfd->v_prev->cmd = SWAP16(CMD_FLEX);
791 DMA_WBACK_INV(dev, rfd->v_prev, sizeof(struct i596_rfd));
792 rfd = lp->rfd_head;
793 DMA_INV(dev, rfd, sizeof(struct i596_rfd));
794 }
795
796 DEB(DEB_RXFRAME, printk(KERN_DEBUG "frames %d\n", frames));
797
798 return 0;
799 }
800
801
802 static inline void i596_cleanup_cmd(struct net_device *dev, struct i596_private *lp)
803 {
804 struct i596_cmd *ptr;
805
806 while (lp->cmd_head != NULL) {
807 ptr = lp->cmd_head;
808 lp->cmd_head = ptr->v_next;
809 lp->cmd_backlog--;
810
811 switch (SWAP16(ptr->command) & 0x7) {
812 case CmdTx:
813 {
814 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
815 struct sk_buff *skb = tx_cmd->skb;
816 dma_unmap_single(dev->dev.parent,
817 tx_cmd->dma_addr,
818 skb->len, DMA_TO_DEVICE);
819
820 dev_kfree_skb(skb);
821
822 dev->stats.tx_errors++;
823 dev->stats.tx_aborted_errors++;
824
825 ptr->v_next = NULL;
826 ptr->b_next = I596_NULL;
827 tx_cmd->cmd.command = 0; /* Mark as free */
828 break;
829 }
830 default:
831 ptr->v_next = NULL;
832 ptr->b_next = I596_NULL;
833 }
834 DMA_WBACK_INV(dev, ptr, sizeof(struct i596_cmd));
835 }
836
837 wait_cmd(dev, lp->dma, 100, "i596_cleanup_cmd timed out");
838 lp->dma->scb.cmd = I596_NULL;
839 DMA_WBACK(dev, &(lp->dma->scb), sizeof(struct i596_scb));
840 }
841
842
843 static inline void i596_reset(struct net_device *dev, struct i596_private *lp)
844 {
845 unsigned long flags;
846
847 DEB(DEB_RESET, printk(KERN_DEBUG "i596_reset\n"));
848
849 spin_lock_irqsave (&lp->lock, flags);
850
851 wait_cmd(dev, lp->dma, 100, "i596_reset timed out");
852
853 netif_stop_queue(dev);
854
855 /* FIXME: this command might cause an lpmc */
856 lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
857 DMA_WBACK(dev, &(lp->dma->scb), sizeof(struct i596_scb));
858 ca(dev);
859
860 /* wait for shutdown */
861 wait_cmd(dev, lp->dma, 1000, "i596_reset 2 timed out");
862 spin_unlock_irqrestore (&lp->lock, flags);
863
864 i596_cleanup_cmd(dev, lp);
865 i596_rx(dev);
866
867 netif_start_queue(dev);
868 init_i596_mem(dev);
869 }
870
871
872 static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd)
873 {
874 struct i596_private *lp = netdev_priv(dev);
875 struct i596_dma *dma = lp->dma;
876 unsigned long flags;
877
878 DEB(DEB_ADDCMD, printk(KERN_DEBUG "i596_add_cmd cmd_head %p\n",
879 lp->cmd_head));
880
881 cmd->status = 0;
882 cmd->command |= SWAP16(CMD_EOL | CMD_INTR);
883 cmd->v_next = NULL;
884 cmd->b_next = I596_NULL;
885 DMA_WBACK(dev, cmd, sizeof(struct i596_cmd));
886
887 spin_lock_irqsave (&lp->lock, flags);
888
889 if (lp->cmd_head != NULL) {
890 lp->cmd_tail->v_next = cmd;
891 lp->cmd_tail->b_next = SWAP32(virt_to_dma(lp, &cmd->status));
892 DMA_WBACK(dev, lp->cmd_tail, sizeof(struct i596_cmd));
893 } else {
894 lp->cmd_head = cmd;
895 wait_cmd(dev, dma, 100, "i596_add_cmd timed out");
896 dma->scb.cmd = SWAP32(virt_to_dma(lp, &cmd->status));
897 dma->scb.command = SWAP16(CUC_START);
898 DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
899 ca(dev);
900 }
901 lp->cmd_tail = cmd;
902 lp->cmd_backlog++;
903
904 spin_unlock_irqrestore (&lp->lock, flags);
905
906 if (lp->cmd_backlog > max_cmd_backlog) {
907 unsigned long tickssofar = jiffies - lp->last_cmd;
908
909 if (tickssofar < ticks_limit)
910 return;
911
912 printk(KERN_ERR
913 "%s: command unit timed out, status resetting.\n",
914 dev->name);
915 #if 1
916 i596_reset(dev, lp);
917 #endif
918 }
919 }
920
921 static int i596_open(struct net_device *dev)
922 {
923 DEB(DEB_OPEN, printk(KERN_DEBUG
924 "%s: i596_open() irq %d.\n", dev->name, dev->irq));
925
926 if (init_rx_bufs(dev)) {
927 printk(KERN_ERR "%s: Failed to init rx bufs\n", dev->name);
928 return -EAGAIN;
929 }
930 if (init_i596_mem(dev)) {
931 printk(KERN_ERR "%s: Failed to init memory\n", dev->name);
932 goto out_remove_rx_bufs;
933 }
934 netif_start_queue(dev);
935
936 return 0;
937
938 out_remove_rx_bufs:
939 remove_rx_bufs(dev);
940 return -EAGAIN;
941 }
942
943 static void i596_tx_timeout (struct net_device *dev)
944 {
945 struct i596_private *lp = netdev_priv(dev);
946
947 /* Transmitter timeout, serious problems. */
948 DEB(DEB_ERRORS, printk(KERN_DEBUG
949 "%s: transmit timed out, status resetting.\n",
950 dev->name));
951
952 dev->stats.tx_errors++;
953
954 /* Try to restart the adaptor */
955 if (lp->last_restart == dev->stats.tx_packets) {
956 DEB(DEB_ERRORS, printk(KERN_DEBUG "Resetting board.\n"));
957 /* Shutdown and restart */
958 i596_reset (dev, lp);
959 } else {
960 /* Issue a channel attention signal */
961 DEB(DEB_ERRORS, printk(KERN_DEBUG "Kicking board.\n"));
962 lp->dma->scb.command = SWAP16(CUC_START | RX_START);
963 DMA_WBACK_INV(dev, &(lp->dma->scb), sizeof(struct i596_scb));
964 ca (dev);
965 lp->last_restart = dev->stats.tx_packets;
966 }
967
968 dev->trans_start = jiffies;
969 netif_wake_queue (dev);
970 }
971
972
973 static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev)
974 {
975 struct i596_private *lp = netdev_priv(dev);
976 struct tx_cmd *tx_cmd;
977 struct i596_tbd *tbd;
978 short length = skb->len;
979 dev->trans_start = jiffies;
980
981 DEB(DEB_STARTTX, printk(KERN_DEBUG
982 "%s: i596_start_xmit(%x,%p) called\n",
983 dev->name, skb->len, skb->data));
984
985 if (length < ETH_ZLEN) {
986 if (skb_padto(skb, ETH_ZLEN))
987 return 0;
988 length = ETH_ZLEN;
989 }
990
991 netif_stop_queue(dev);
992
993 tx_cmd = lp->dma->tx_cmds + lp->next_tx_cmd;
994 tbd = lp->dma->tbds + lp->next_tx_cmd;
995
996 if (tx_cmd->cmd.command) {
997 DEB(DEB_ERRORS, printk(KERN_DEBUG
998 "%s: xmit ring full, dropping packet.\n",
999 dev->name));
1000 dev->stats.tx_dropped++;
1001
1002 dev_kfree_skb(skb);
1003 } else {
1004 if (++lp->next_tx_cmd == TX_RING_SIZE)
1005 lp->next_tx_cmd = 0;
1006 tx_cmd->tbd = SWAP32(virt_to_dma(lp, tbd));
1007 tbd->next = I596_NULL;
1008
1009 tx_cmd->cmd.command = SWAP16(CMD_FLEX | CmdTx);
1010 tx_cmd->skb = skb;
1011
1012 tx_cmd->pad = 0;
1013 tx_cmd->size = 0;
1014 tbd->pad = 0;
1015 tbd->size = SWAP16(EOF | length);
1016
1017 tx_cmd->dma_addr = dma_map_single(dev->dev.parent, skb->data,
1018 skb->len, DMA_TO_DEVICE);
1019 tbd->data = SWAP32(tx_cmd->dma_addr);
1020
1021 DEB(DEB_TXADDR, print_eth(skb->data, "tx-queued"));
1022 DMA_WBACK_INV(dev, tx_cmd, sizeof(struct tx_cmd));
1023 DMA_WBACK_INV(dev, tbd, sizeof(struct i596_tbd));
1024 i596_add_cmd(dev, &tx_cmd->cmd);
1025
1026 dev->stats.tx_packets++;
1027 dev->stats.tx_bytes += length;
1028 }
1029
1030 netif_start_queue(dev);
1031
1032 return 0;
1033 }
1034
1035 static void print_eth(unsigned char *add, char *str)
1036 {
1037 DECLARE_MAC_BUF(mac);
1038 DECLARE_MAC_BUF(mac2);
1039
1040 printk(KERN_DEBUG "i596 0x%p, %s --> %s %02X%02X, %s\n",
1041 add, print_mac(mac, add + 6), print_mac(mac2, add),
1042 add[12], add[13], str);
1043 }
1044
1045 static int __devinit i82596_probe(struct net_device *dev)
1046 {
1047 int i;
1048 struct i596_private *lp = netdev_priv(dev);
1049 struct i596_dma *dma;
1050
1051 /* This lot is ensure things have been cache line aligned. */
1052 BUILD_BUG_ON(sizeof(struct i596_rfd) != 32);
1053 BUILD_BUG_ON(sizeof(struct i596_rbd) & 31);
1054 BUILD_BUG_ON(sizeof(struct tx_cmd) & 31);
1055 BUILD_BUG_ON(sizeof(struct i596_tbd) != 32);
1056 #ifndef __LP64__
1057 BUILD_BUG_ON(sizeof(struct i596_dma) > 4096);
1058 #endif
1059
1060 if (!dev->base_addr || !dev->irq)
1061 return -ENODEV;
1062
1063 dma = (struct i596_dma *) DMA_ALLOC(dev->dev.parent,
1064 sizeof(struct i596_dma), &lp->dma_addr, GFP_KERNEL);
1065 if (!dma) {
1066 printk(KERN_ERR "%s: Couldn't get shared memory\n", __FILE__);
1067 return -ENOMEM;
1068 }
1069
1070 /* The 82596-specific entries in the device structure. */
1071 dev->open = i596_open;
1072 dev->stop = i596_close;
1073 dev->hard_start_xmit = i596_start_xmit;
1074 dev->set_multicast_list = set_multicast_list;
1075 dev->tx_timeout = i596_tx_timeout;
1076 dev->watchdog_timeo = TX_TIMEOUT;
1077 #ifdef CONFIG_NET_POLL_CONTROLLER
1078 dev->poll_controller = i596_poll_controller;
1079 #endif
1080
1081 memset(dma, 0, sizeof(struct i596_dma));
1082 lp->dma = dma;
1083
1084 dma->scb.command = 0;
1085 dma->scb.cmd = I596_NULL;
1086 dma->scb.rfd = I596_NULL;
1087 spin_lock_init(&lp->lock);
1088
1089 DMA_WBACK_INV(dev, dma, sizeof(struct i596_dma));
1090
1091 i = register_netdev(dev);
1092 if (i) {
1093 DMA_FREE(dev->dev.parent, sizeof(struct i596_dma),
1094 (void *)dma, lp->dma_addr);
1095 return i;
1096 };
1097
1098 DEB(DEB_PROBE, printk(KERN_INFO "%s: 82596 at %#3lx,",
1099 dev->name, dev->base_addr));
1100 for (i = 0; i < 6; i++)
1101 DEB(DEB_PROBE, printk(" %2.2X", dev->dev_addr[i]));
1102 DEB(DEB_PROBE, printk(" IRQ %d.\n", dev->irq));
1103 DEB(DEB_INIT, printk(KERN_INFO
1104 "%s: dma at 0x%p (%d bytes), lp->scb at 0x%p\n",
1105 dev->name, dma, (int)sizeof(struct i596_dma),
1106 &dma->scb));
1107
1108 return 0;
1109 }
1110
1111 #ifdef CONFIG_NET_POLL_CONTROLLER
1112 static void i596_poll_controller(struct net_device *dev)
1113 {
1114 disable_irq(dev->irq);
1115 i596_interrupt(dev->irq, dev);
1116 enable_irq(dev->irq);
1117 }
1118 #endif
1119
1120 static irqreturn_t i596_interrupt(int irq, void *dev_id)
1121 {
1122 struct net_device *dev = dev_id;
1123 struct i596_private *lp;
1124 struct i596_dma *dma;
1125 unsigned short status, ack_cmd = 0;
1126
1127 lp = netdev_priv(dev);
1128 dma = lp->dma;
1129
1130 spin_lock (&lp->lock);
1131
1132 wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1133 status = SWAP16(dma->scb.status);
1134
1135 DEB(DEB_INTS, printk(KERN_DEBUG
1136 "%s: i596 interrupt, IRQ %d, status %4.4x.\n",
1137 dev->name, dev->irq, status));
1138
1139 ack_cmd = status & 0xf000;
1140
1141 if (!ack_cmd) {
1142 DEB(DEB_ERRORS, printk(KERN_DEBUG
1143 "%s: interrupt with no events\n",
1144 dev->name));
1145 spin_unlock (&lp->lock);
1146 return IRQ_NONE;
1147 }
1148
1149 if ((status & 0x8000) || (status & 0x2000)) {
1150 struct i596_cmd *ptr;
1151
1152 if ((status & 0x8000))
1153 DEB(DEB_INTS,
1154 printk(KERN_DEBUG
1155 "%s: i596 interrupt completed command.\n",
1156 dev->name));
1157 if ((status & 0x2000))
1158 DEB(DEB_INTS,
1159 printk(KERN_DEBUG
1160 "%s: i596 interrupt command unit inactive %x.\n",
1161 dev->name, status & 0x0700));
1162
1163 while (lp->cmd_head != NULL) {
1164 DMA_INV(dev, lp->cmd_head, sizeof(struct i596_cmd));
1165 if (!(lp->cmd_head->status & SWAP16(STAT_C)))
1166 break;
1167
1168 ptr = lp->cmd_head;
1169
1170 DEB(DEB_STATUS,
1171 printk(KERN_DEBUG
1172 "cmd_head->status = %04x, ->command = %04x\n",
1173 SWAP16(lp->cmd_head->status),
1174 SWAP16(lp->cmd_head->command)));
1175 lp->cmd_head = ptr->v_next;
1176 lp->cmd_backlog--;
1177
1178 switch (SWAP16(ptr->command) & 0x7) {
1179 case CmdTx:
1180 {
1181 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
1182 struct sk_buff *skb = tx_cmd->skb;
1183
1184 if (ptr->status & SWAP16(STAT_OK)) {
1185 DEB(DEB_TXADDR,
1186 print_eth(skb->data, "tx-done"));
1187 } else {
1188 dev->stats.tx_errors++;
1189 if (ptr->status & SWAP16(0x0020))
1190 dev->stats.collisions++;
1191 if (!(ptr->status & SWAP16(0x0040)))
1192 dev->stats.tx_heartbeat_errors++;
1193 if (ptr->status & SWAP16(0x0400))
1194 dev->stats.tx_carrier_errors++;
1195 if (ptr->status & SWAP16(0x0800))
1196 dev->stats.collisions++;
1197 if (ptr->status & SWAP16(0x1000))
1198 dev->stats.tx_aborted_errors++;
1199 }
1200 dma_unmap_single(dev->dev.parent,
1201 tx_cmd->dma_addr,
1202 skb->len, DMA_TO_DEVICE);
1203 dev_kfree_skb_irq(skb);
1204
1205 tx_cmd->cmd.command = 0; /* Mark free */
1206 break;
1207 }
1208 case CmdTDR:
1209 {
1210 unsigned short status = SWAP16(((struct tdr_cmd *)ptr)->status);
1211
1212 if (status & 0x8000) {
1213 DEB(DEB_ANY,
1214 printk(KERN_DEBUG "%s: link ok.\n",
1215 dev->name));
1216 } else {
1217 if (status & 0x4000)
1218 printk(KERN_ERR
1219 "%s: Transceiver problem.\n",
1220 dev->name);
1221 if (status & 0x2000)
1222 printk(KERN_ERR
1223 "%s: Termination problem.\n",
1224 dev->name);
1225 if (status & 0x1000)
1226 printk(KERN_ERR
1227 "%s: Short circuit.\n",
1228 dev->name);
1229
1230 DEB(DEB_TDR,
1231 printk(KERN_DEBUG "%s: Time %d.\n",
1232 dev->name, status & 0x07ff));
1233 }
1234 break;
1235 }
1236 case CmdConfigure:
1237 /*
1238 * Zap command so set_multicast_list() know
1239 * it is free
1240 */
1241 ptr->command = 0;
1242 break;
1243 }
1244 ptr->v_next = NULL;
1245 ptr->b_next = I596_NULL;
1246 DMA_WBACK(dev, ptr, sizeof(struct i596_cmd));
1247 lp->last_cmd = jiffies;
1248 }
1249
1250 /* This mess is arranging that only the last of any outstanding
1251 * commands has the interrupt bit set. Should probably really
1252 * only add to the cmd queue when the CU is stopped.
1253 */
1254 ptr = lp->cmd_head;
1255 while ((ptr != NULL) && (ptr != lp->cmd_tail)) {
1256 struct i596_cmd *prev = ptr;
1257
1258 ptr->command &= SWAP16(0x1fff);
1259 ptr = ptr->v_next;
1260 DMA_WBACK_INV(dev, prev, sizeof(struct i596_cmd));
1261 }
1262
1263 if (lp->cmd_head != NULL)
1264 ack_cmd |= CUC_START;
1265 dma->scb.cmd = SWAP32(virt_to_dma(lp, &lp->cmd_head->status));
1266 DMA_WBACK_INV(dev, &dma->scb, sizeof(struct i596_scb));
1267 }
1268 if ((status & 0x1000) || (status & 0x4000)) {
1269 if ((status & 0x4000))
1270 DEB(DEB_INTS,
1271 printk(KERN_DEBUG
1272 "%s: i596 interrupt received a frame.\n",
1273 dev->name));
1274 i596_rx(dev);
1275 /* Only RX_START if stopped - RGH 07-07-96 */
1276 if (status & 0x1000) {
1277 if (netif_running(dev)) {
1278 DEB(DEB_ERRORS,
1279 printk(KERN_DEBUG
1280 "%s: i596 interrupt receive unit inactive, status 0x%x\n",
1281 dev->name, status));
1282 ack_cmd |= RX_START;
1283 dev->stats.rx_errors++;
1284 dev->stats.rx_fifo_errors++;
1285 rebuild_rx_bufs(dev);
1286 }
1287 }
1288 }
1289 wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1290 dma->scb.command = SWAP16(ack_cmd);
1291 DMA_WBACK(dev, &dma->scb, sizeof(struct i596_scb));
1292
1293 /* DANGER: I suspect that some kind of interrupt
1294 acknowledgement aside from acking the 82596 might be needed
1295 here... but it's running acceptably without */
1296
1297 ca(dev);
1298
1299 wait_cmd(dev, dma, 100, "i596 interrupt, exit timeout");
1300 DEB(DEB_INTS, printk(KERN_DEBUG "%s: exiting interrupt.\n", dev->name));
1301
1302 spin_unlock (&lp->lock);
1303 return IRQ_HANDLED;
1304 }
1305
1306 static int i596_close(struct net_device *dev)
1307 {
1308 struct i596_private *lp = netdev_priv(dev);
1309 unsigned long flags;
1310
1311 netif_stop_queue(dev);
1312
1313 DEB(DEB_INIT,
1314 printk(KERN_DEBUG
1315 "%s: Shutting down ethercard, status was %4.4x.\n",
1316 dev->name, SWAP16(lp->dma->scb.status)));
1317
1318 spin_lock_irqsave(&lp->lock, flags);
1319
1320 wait_cmd(dev, lp->dma, 100, "close1 timed out");
1321 lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
1322 DMA_WBACK(dev, &lp->dma->scb, sizeof(struct i596_scb));
1323
1324 ca(dev);
1325
1326 wait_cmd(dev, lp->dma, 100, "close2 timed out");
1327 spin_unlock_irqrestore(&lp->lock, flags);
1328 DEB(DEB_STRUCT, i596_display_data(dev));
1329 i596_cleanup_cmd(dev, lp);
1330
1331 free_irq(dev->irq, dev);
1332 remove_rx_bufs(dev);
1333
1334 return 0;
1335 }
1336
1337 /*
1338 * Set or clear the multicast filter for this adaptor.
1339 */
1340
1341 static void set_multicast_list(struct net_device *dev)
1342 {
1343 struct i596_private *lp = netdev_priv(dev);
1344 struct i596_dma *dma = lp->dma;
1345 int config = 0, cnt;
1346 DECLARE_MAC_BUF(mac);
1347
1348 DEB(DEB_MULTI,
1349 printk(KERN_DEBUG
1350 "%s: set multicast list, %d entries, promisc %s, allmulti %s\n",
1351 dev->name, dev->mc_count,
1352 dev->flags & IFF_PROMISC ? "ON" : "OFF",
1353 dev->flags & IFF_ALLMULTI ? "ON" : "OFF"));
1354
1355 if ((dev->flags & IFF_PROMISC) &&
1356 !(dma->cf_cmd.i596_config[8] & 0x01)) {
1357 dma->cf_cmd.i596_config[8] |= 0x01;
1358 config = 1;
1359 }
1360 if (!(dev->flags & IFF_PROMISC) &&
1361 (dma->cf_cmd.i596_config[8] & 0x01)) {
1362 dma->cf_cmd.i596_config[8] &= ~0x01;
1363 config = 1;
1364 }
1365 if ((dev->flags & IFF_ALLMULTI) &&
1366 (dma->cf_cmd.i596_config[11] & 0x20)) {
1367 dma->cf_cmd.i596_config[11] &= ~0x20;
1368 config = 1;
1369 }
1370 if (!(dev->flags & IFF_ALLMULTI) &&
1371 !(dma->cf_cmd.i596_config[11] & 0x20)) {
1372 dma->cf_cmd.i596_config[11] |= 0x20;
1373 config = 1;
1374 }
1375 if (config) {
1376 if (dma->cf_cmd.cmd.command)
1377 printk(KERN_INFO
1378 "%s: config change request already queued\n",
1379 dev->name);
1380 else {
1381 dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
1382 DMA_WBACK_INV(dev, &dma->cf_cmd, sizeof(struct cf_cmd));
1383 i596_add_cmd(dev, &dma->cf_cmd.cmd);
1384 }
1385 }
1386
1387 cnt = dev->mc_count;
1388 if (cnt > MAX_MC_CNT) {
1389 cnt = MAX_MC_CNT;
1390 printk(KERN_NOTICE "%s: Only %d multicast addresses supported",
1391 dev->name, cnt);
1392 }
1393
1394 if (dev->mc_count > 0) {
1395 struct dev_mc_list *dmi;
1396 unsigned char *cp;
1397 struct mc_cmd *cmd;
1398
1399 cmd = &dma->mc_cmd;
1400 cmd->cmd.command = SWAP16(CmdMulticastList);
1401 cmd->mc_cnt = SWAP16(dev->mc_count * 6);
1402 cp = cmd->mc_addrs;
1403 for (dmi = dev->mc_list;
1404 cnt && dmi != NULL;
1405 dmi = dmi->next, cnt--, cp += 6) {
1406 memcpy(cp, dmi->dmi_addr, 6);
1407 if (i596_debug > 1)
1408 DEB(DEB_MULTI,
1409 printk(KERN_DEBUG
1410 "%s: Adding address %s\n",
1411 dev->name, print_mac(mac, cp)));
1412 }
1413 DMA_WBACK_INV(dev, &dma->mc_cmd, sizeof(struct mc_cmd));
1414 i596_add_cmd(dev, &cmd->cmd);
1415 }
1416 }
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