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udl-kms: avoid prefetch
[linux/fpc-iii.git] / drivers / net / ethernet / i825xx / lib82596.c
blobf00a1dc2128cbcfcf590cb22bf88aa3796b6ab45
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 * performance 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/interrupt.h>
77 #include <linux/delay.h>
78 #include <linux/netdevice.h>
79 #include <linux/etherdevice.h>
80 #include <linux/skbuff.h>
81 #include <linux/types.h>
82 #include <linux/bitops.h>
83 #include <linux/dma-mapping.h>
84 #include <linux/io.h>
85 #include <linux/irq.h>
86 #include <linux/gfp.h>
87
88 /* DEBUG flags
89 */
90
91 #define DEB_INIT 0x0001
92 #define DEB_PROBE 0x0002
93 #define DEB_SERIOUS 0x0004
94 #define DEB_ERRORS 0x0008
95 #define DEB_MULTI 0x0010
96 #define DEB_TDR 0x0020
97 #define DEB_OPEN 0x0040
98 #define DEB_RESET 0x0080
99 #define DEB_ADDCMD 0x0100
100 #define DEB_STATUS 0x0200
101 #define DEB_STARTTX 0x0400
102 #define DEB_RXADDR 0x0800
103 #define DEB_TXADDR 0x1000
104 #define DEB_RXFRAME 0x2000
105 #define DEB_INTS 0x4000
106 #define DEB_STRUCT 0x8000
107 #define DEB_ANY 0xffff
108
109
110 #define DEB(x, y) if (i596_debug & (x)) { y; }
111
112
113 /*
114 * The MPU_PORT command allows direct access to the 82596. With PORT access
115 * the following commands are available (p5-18). The 32-bit port command
116 * must be word-swapped with the most significant word written first.
117 * This only applies to VME boards.
118 */
119 #define PORT_RESET 0x00 /* reset 82596 */
120 #define PORT_SELFTEST 0x01 /* selftest */
121 #define PORT_ALTSCP 0x02 /* alternate SCB address */
122 #define PORT_ALTDUMP 0x03 /* Alternate DUMP address */
123
124 static int i596_debug = (DEB_SERIOUS|DEB_PROBE);
125
126 /* Copy frames shorter than rx_copybreak, otherwise pass on up in
127 * a full sized sk_buff. Value of 100 stolen from tulip.c (!alpha).
128 */
129 static int rx_copybreak = 100;
130
131 #define PKT_BUF_SZ 1536
132 #define MAX_MC_CNT 64
133
134 #define ISCP_BUSY 0x0001
135
136 #define I596_NULL ((u32)0xffffffff)
137
138 #define CMD_EOL 0x8000 /* The last command of the list, stop. */
139 #define CMD_SUSP 0x4000 /* Suspend after doing cmd. */
140 #define CMD_INTR 0x2000 /* Interrupt after doing cmd. */
141
142 #define CMD_FLEX 0x0008 /* Enable flexible memory model */
143
144 enum commands {
145 CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
146 CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7
147 };
148
149 #define STAT_C 0x8000 /* Set to 0 after execution */
150 #define STAT_B 0x4000 /* Command being executed */
151 #define STAT_OK 0x2000 /* Command executed ok */
152 #define STAT_A 0x1000 /* Command aborted */
153
154 #define CUC_START 0x0100
155 #define CUC_RESUME 0x0200
156 #define CUC_SUSPEND 0x0300
157 #define CUC_ABORT 0x0400
158 #define RX_START 0x0010
159 #define RX_RESUME 0x0020
160 #define RX_SUSPEND 0x0030
161 #define RX_ABORT 0x0040
162
163 #define TX_TIMEOUT (HZ/20)
164
165
166 struct i596_reg {
167 unsigned short porthi;
168 unsigned short portlo;
169 u32 ca;
170 };
171
172 #define EOF 0x8000
173 #define SIZE_MASK 0x3fff
174
175 struct i596_tbd {
176 unsigned short size;
177 unsigned short pad;
178 u32 next;
179 u32 data;
180 u32 cache_pad[5]; /* Total 32 bytes... */
181 };
182
183 /* The command structure has two 'next' pointers; v_next is the address of
184 * the next command as seen by the CPU, b_next is the address of the next
185 * command as seen by the 82596. The b_next pointer, as used by the 82596
186 * always references the status field of the next command, rather than the
187 * v_next field, because the 82596 is unaware of v_next. It may seem more
188 * logical to put v_next at the end of the structure, but we cannot do that
189 * because the 82596 expects other fields to be there, depending on command
190 * type.
191 */
192
193 struct i596_cmd {
194 struct i596_cmd *v_next; /* Address from CPUs viewpoint */
195 unsigned short status;
196 unsigned short command;
197 u32 b_next; /* Address from i596 viewpoint */
198 };
199
200 struct tx_cmd {
201 struct i596_cmd cmd;
202 u32 tbd;
203 unsigned short size;
204 unsigned short pad;
205 struct sk_buff *skb; /* So we can free it after tx */
206 dma_addr_t dma_addr;
207 #ifdef __LP64__
208 u32 cache_pad[6]; /* Total 64 bytes... */
209 #else
210 u32 cache_pad[1]; /* Total 32 bytes... */
211 #endif
212 };
213
214 struct tdr_cmd {
215 struct i596_cmd cmd;
216 unsigned short status;
217 unsigned short pad;
218 };
219
220 struct mc_cmd {
221 struct i596_cmd cmd;
222 short mc_cnt;
223 char mc_addrs[MAX_MC_CNT*6];
224 };
225
226 struct sa_cmd {
227 struct i596_cmd cmd;
228 char eth_addr[8];
229 };
230
231 struct cf_cmd {
232 struct i596_cmd cmd;
233 char i596_config[16];
234 };
235
236 struct i596_rfd {
237 unsigned short stat;
238 unsigned short cmd;
239 u32 b_next; /* Address from i596 viewpoint */
240 u32 rbd;
241 unsigned short count;
242 unsigned short size;
243 struct i596_rfd *v_next; /* Address from CPUs viewpoint */
244 struct i596_rfd *v_prev;
245 #ifndef __LP64__
246 u32 cache_pad[2]; /* Total 32 bytes... */
247 #endif
248 };
249
250 struct i596_rbd {
251 /* hardware data */
252 unsigned short count;
253 unsigned short zero1;
254 u32 b_next;
255 u32 b_data; /* Address from i596 viewpoint */
256 unsigned short size;
257 unsigned short zero2;
258 /* driver data */
259 struct sk_buff *skb;
260 struct i596_rbd *v_next;
261 u32 b_addr; /* This rbd addr from i596 view */
262 unsigned char *v_data; /* Address from CPUs viewpoint */
263 /* Total 32 bytes... */
264 #ifdef __LP64__
265 u32 cache_pad[4];
266 #endif
267 };
268
269 /* These values as chosen so struct i596_dma fits in one page... */
270
271 #define TX_RING_SIZE 32
272 #define RX_RING_SIZE 16
273
274 struct i596_scb {
275 unsigned short status;
276 unsigned short command;
277 u32 cmd;
278 u32 rfd;
279 u32 crc_err;
280 u32 align_err;
281 u32 resource_err;
282 u32 over_err;
283 u32 rcvdt_err;
284 u32 short_err;
285 unsigned short t_on;
286 unsigned short t_off;
287 };
288
289 struct i596_iscp {
290 u32 stat;
291 u32 scb;
292 };
293
294 struct i596_scp {
295 u32 sysbus;
296 u32 pad;
297 u32 iscp;
298 };
299
300 struct i596_dma {
301 struct i596_scp scp __attribute__((aligned(32)));
302 volatile struct i596_iscp iscp __attribute__((aligned(32)));
303 volatile struct i596_scb scb __attribute__((aligned(32)));
304 struct sa_cmd sa_cmd __attribute__((aligned(32)));
305 struct cf_cmd cf_cmd __attribute__((aligned(32)));
306 struct tdr_cmd tdr_cmd __attribute__((aligned(32)));
307 struct mc_cmd mc_cmd __attribute__((aligned(32)));
308 struct i596_rfd rfds[RX_RING_SIZE] __attribute__((aligned(32)));
309 struct i596_rbd rbds[RX_RING_SIZE] __attribute__((aligned(32)));
310 struct tx_cmd tx_cmds[TX_RING_SIZE] __attribute__((aligned(32)));
311 struct i596_tbd tbds[TX_RING_SIZE] __attribute__((aligned(32)));
312 };
313
314 struct i596_private {
315 struct i596_dma *dma;
316 u32 stat;
317 int last_restart;
318 struct i596_rfd *rfd_head;
319 struct i596_rbd *rbd_head;
320 struct i596_cmd *cmd_tail;
321 struct i596_cmd *cmd_head;
322 int cmd_backlog;
323 u32 last_cmd;
324 int next_tx_cmd;
325 int options;
326 spinlock_t lock; /* serialize access to chip */
327 dma_addr_t dma_addr;
328 void __iomem *mpu_port;
329 void __iomem *ca;
330 };
331
332 static const char init_setup[] =
333 {
334 0x8E, /* length, prefetch on */
335 0xC8, /* fifo to 8, monitor off */
336 0x80, /* don't save bad frames */
337 0x2E, /* No source address insertion, 8 byte preamble */
338 0x00, /* priority and backoff defaults */
339 0x60, /* interframe spacing */
340 0x00, /* slot time LSB */
341 0xf2, /* slot time and retries */
342 0x00, /* promiscuous mode */
343 0x00, /* collision detect */
344 0x40, /* minimum frame length */
345 0xff,
346 0x00,
347 0x7f /* *multi IA */ };
348
349 static int i596_open(struct net_device *dev);
350 static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev);
351 static irqreturn_t i596_interrupt(int irq, void *dev_id);
352 static int i596_close(struct net_device *dev);
353 static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd);
354 static void i596_tx_timeout (struct net_device *dev);
355 static void print_eth(unsigned char *buf, char *str);
356 static void set_multicast_list(struct net_device *dev);
357 static inline void ca(struct net_device *dev);
358 static void mpu_port(struct net_device *dev, int c, dma_addr_t x);
359
360 static int rx_ring_size = RX_RING_SIZE;
361 static int ticks_limit = 100;
362 static int max_cmd_backlog = TX_RING_SIZE-1;
363
364 #ifdef CONFIG_NET_POLL_CONTROLLER
365 static void i596_poll_controller(struct net_device *dev);
366 #endif
367
368
369 static inline int wait_istat(struct net_device *dev, struct i596_dma *dma, int delcnt, char *str)
370 {
371 DMA_INV(dev, &(dma->iscp), sizeof(struct i596_iscp));
372 while (--delcnt && dma->iscp.stat) {
373 udelay(10);
374 DMA_INV(dev, &(dma->iscp), sizeof(struct i596_iscp));
375 }
376 if (!delcnt) {
377 printk(KERN_ERR "%s: %s, iscp.stat %04x, didn't clear\n",
378 dev->name, str, SWAP16(dma->iscp.stat));
379 return -1;
380 } else
381 return 0;
382 }
383
384
385 static inline int wait_cmd(struct net_device *dev, struct i596_dma *dma, int delcnt, char *str)
386 {
387 DMA_INV(dev, &(dma->scb), sizeof(struct i596_scb));
388 while (--delcnt && dma->scb.command) {
389 udelay(10);
390 DMA_INV(dev, &(dma->scb), sizeof(struct i596_scb));
391 }
392 if (!delcnt) {
393 printk(KERN_ERR "%s: %s, status %4.4x, cmd %4.4x.\n",
394 dev->name, str,
395 SWAP16(dma->scb.status),
396 SWAP16(dma->scb.command));
397 return -1;
398 } else
399 return 0;
400 }
401
402
403 static void i596_display_data(struct net_device *dev)
404 {
405 struct i596_private *lp = netdev_priv(dev);
406 struct i596_dma *dma = lp->dma;
407 struct i596_cmd *cmd;
408 struct i596_rfd *rfd;
409 struct i596_rbd *rbd;
410
411 printk(KERN_DEBUG "lp and scp at %p, .sysbus = %08x, .iscp = %08x\n",
412 &dma->scp, dma->scp.sysbus, SWAP32(dma->scp.iscp));
413 printk(KERN_DEBUG "iscp at %p, iscp.stat = %08x, .scb = %08x\n",
414 &dma->iscp, SWAP32(dma->iscp.stat), SWAP32(dma->iscp.scb));
415 printk(KERN_DEBUG "scb at %p, scb.status = %04x, .command = %04x,"
416 " .cmd = %08x, .rfd = %08x\n",
417 &dma->scb, SWAP16(dma->scb.status), SWAP16(dma->scb.command),
418 SWAP16(dma->scb.cmd), SWAP32(dma->scb.rfd));
419 printk(KERN_DEBUG " errors: crc %x, align %x, resource %x,"
420 " over %x, rcvdt %x, short %x\n",
421 SWAP32(dma->scb.crc_err), SWAP32(dma->scb.align_err),
422 SWAP32(dma->scb.resource_err), SWAP32(dma->scb.over_err),
423 SWAP32(dma->scb.rcvdt_err), SWAP32(dma->scb.short_err));
424 cmd = lp->cmd_head;
425 while (cmd != NULL) {
426 printk(KERN_DEBUG
427 "cmd at %p, .status = %04x, .command = %04x,"
428 " .b_next = %08x\n",
429 cmd, SWAP16(cmd->status), SWAP16(cmd->command),
430 SWAP32(cmd->b_next));
431 cmd = cmd->v_next;
432 }
433 rfd = lp->rfd_head;
434 printk(KERN_DEBUG "rfd_head = %p\n", rfd);
435 do {
436 printk(KERN_DEBUG
437 " %p .stat %04x, .cmd %04x, b_next %08x, rbd %08x,"
438 " count %04x\n",
439 rfd, SWAP16(rfd->stat), SWAP16(rfd->cmd),
440 SWAP32(rfd->b_next), SWAP32(rfd->rbd),
441 SWAP16(rfd->count));
442 rfd = rfd->v_next;
443 } while (rfd != lp->rfd_head);
444 rbd = lp->rbd_head;
445 printk(KERN_DEBUG "rbd_head = %p\n", rbd);
446 do {
447 printk(KERN_DEBUG
448 " %p .count %04x, b_next %08x, b_data %08x,"
449 " size %04x\n",
450 rbd, SWAP16(rbd->count), SWAP32(rbd->b_next),
451 SWAP32(rbd->b_data), SWAP16(rbd->size));
452 rbd = rbd->v_next;
453 } while (rbd != lp->rbd_head);
454 DMA_INV(dev, dma, sizeof(struct i596_dma));
455 }
456
457
458 #define virt_to_dma(lp, v) ((lp)->dma_addr + (dma_addr_t)((unsigned long)(v)-(unsigned long)((lp)->dma)))
459
460 static inline int init_rx_bufs(struct net_device *dev)
461 {
462 struct i596_private *lp = netdev_priv(dev);
463 struct i596_dma *dma = lp->dma;
464 int i;
465 struct i596_rfd *rfd;
466 struct i596_rbd *rbd;
467
468 /* First build the Receive Buffer Descriptor List */
469
470 for (i = 0, rbd = dma->rbds; i < rx_ring_size; i++, rbd++) {
471 dma_addr_t dma_addr;
472 struct sk_buff *skb;
473
474 skb = netdev_alloc_skb_ip_align(dev, PKT_BUF_SZ);
475 if (skb == NULL)
476 return -1;
477 dma_addr = dma_map_single(dev->dev.parent, skb->data,
478 PKT_BUF_SZ, DMA_FROM_DEVICE);
479 rbd->v_next = rbd+1;
480 rbd->b_next = SWAP32(virt_to_dma(lp, rbd+1));
481 rbd->b_addr = SWAP32(virt_to_dma(lp, rbd));
482 rbd->skb = skb;
483 rbd->v_data = skb->data;
484 rbd->b_data = SWAP32(dma_addr);
485 rbd->size = SWAP16(PKT_BUF_SZ);
486 }
487 lp->rbd_head = dma->rbds;
488 rbd = dma->rbds + rx_ring_size - 1;
489 rbd->v_next = dma->rbds;
490 rbd->b_next = SWAP32(virt_to_dma(lp, dma->rbds));
491
492 /* Now build the Receive Frame Descriptor List */
493
494 for (i = 0, rfd = dma->rfds; i < rx_ring_size; i++, rfd++) {
495 rfd->rbd = I596_NULL;
496 rfd->v_next = rfd+1;
497 rfd->v_prev = rfd-1;
498 rfd->b_next = SWAP32(virt_to_dma(lp, rfd+1));
499 rfd->cmd = SWAP16(CMD_FLEX);
500 }
501 lp->rfd_head = dma->rfds;
502 dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
503 rfd = dma->rfds;
504 rfd->rbd = SWAP32(virt_to_dma(lp, lp->rbd_head));
505 rfd->v_prev = dma->rfds + rx_ring_size - 1;
506 rfd = dma->rfds + rx_ring_size - 1;
507 rfd->v_next = dma->rfds;
508 rfd->b_next = SWAP32(virt_to_dma(lp, dma->rfds));
509 rfd->cmd = SWAP16(CMD_EOL|CMD_FLEX);
510
511 DMA_WBACK_INV(dev, dma, sizeof(struct i596_dma));
512 return 0;
513 }
514
515 static inline void remove_rx_bufs(struct net_device *dev)
516 {
517 struct i596_private *lp = netdev_priv(dev);
518 struct i596_rbd *rbd;
519 int i;
520
521 for (i = 0, rbd = lp->dma->rbds; i < rx_ring_size; i++, rbd++) {
522 if (rbd->skb == NULL)
523 break;
524 dma_unmap_single(dev->dev.parent,
525 (dma_addr_t)SWAP32(rbd->b_data),
526 PKT_BUF_SZ, DMA_FROM_DEVICE);
527 dev_kfree_skb(rbd->skb);
528 }
529 }
530
531
532 static void rebuild_rx_bufs(struct net_device *dev)
533 {
534 struct i596_private *lp = netdev_priv(dev);
535 struct i596_dma *dma = lp->dma;
536 int i;
537
538 /* Ensure rx frame/buffer descriptors are tidy */
539
540 for (i = 0; i < rx_ring_size; i++) {
541 dma->rfds[i].rbd = I596_NULL;
542 dma->rfds[i].cmd = SWAP16(CMD_FLEX);
543 }
544 dma->rfds[rx_ring_size-1].cmd = SWAP16(CMD_EOL|CMD_FLEX);
545 lp->rfd_head = dma->rfds;
546 dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
547 lp->rbd_head = dma->rbds;
548 dma->rfds[0].rbd = SWAP32(virt_to_dma(lp, dma->rbds));
549
550 DMA_WBACK_INV(dev, dma, sizeof(struct i596_dma));
551 }
552
553
554 static int init_i596_mem(struct net_device *dev)
555 {
556 struct i596_private *lp = netdev_priv(dev);
557 struct i596_dma *dma = lp->dma;
558 unsigned long flags;
559
560 mpu_port(dev, PORT_RESET, 0);
561 udelay(100); /* Wait 100us - seems to help */
562
563 /* change the scp address */
564
565 lp->last_cmd = jiffies;
566
567 dma->scp.sysbus = SYSBUS;
568 dma->scp.iscp = SWAP32(virt_to_dma(lp, &(dma->iscp)));
569 dma->iscp.scb = SWAP32(virt_to_dma(lp, &(dma->scb)));
570 dma->iscp.stat = SWAP32(ISCP_BUSY);
571 lp->cmd_backlog = 0;
572
573 lp->cmd_head = NULL;
574 dma->scb.cmd = I596_NULL;
575
576 DEB(DEB_INIT, printk(KERN_DEBUG "%s: starting i82596.\n", dev->name));
577
578 DMA_WBACK(dev, &(dma->scp), sizeof(struct i596_scp));
579 DMA_WBACK(dev, &(dma->iscp), sizeof(struct i596_iscp));
580 DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
581
582 mpu_port(dev, PORT_ALTSCP, virt_to_dma(lp, &dma->scp));
583 ca(dev);
584 if (wait_istat(dev, dma, 1000, "initialization timed out"))
585 goto failed;
586 DEB(DEB_INIT, printk(KERN_DEBUG
587 "%s: i82596 initialization successful\n",
588 dev->name));
589
590 if (request_irq(dev->irq, i596_interrupt, 0, "i82596", dev)) {
591 printk(KERN_ERR "%s: IRQ %d not free\n", dev->name, dev->irq);
592 goto failed;
593 }
594
595 /* Ensure rx frame/buffer descriptors are tidy */
596 rebuild_rx_bufs(dev);
597
598 dma->scb.command = 0;
599 DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
600
601 DEB(DEB_INIT, printk(KERN_DEBUG
602 "%s: queuing CmdConfigure\n", dev->name));
603 memcpy(dma->cf_cmd.i596_config, init_setup, 14);
604 dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
605 DMA_WBACK(dev, &(dma->cf_cmd), sizeof(struct cf_cmd));
606 i596_add_cmd(dev, &dma->cf_cmd.cmd);
607
608 DEB(DEB_INIT, printk(KERN_DEBUG "%s: queuing CmdSASetup\n", dev->name));
609 memcpy(dma->sa_cmd.eth_addr, dev->dev_addr, ETH_ALEN);
610 dma->sa_cmd.cmd.command = SWAP16(CmdSASetup);
611 DMA_WBACK(dev, &(dma->sa_cmd), sizeof(struct sa_cmd));
612 i596_add_cmd(dev, &dma->sa_cmd.cmd);
613
614 DEB(DEB_INIT, printk(KERN_DEBUG "%s: queuing CmdTDR\n", dev->name));
615 dma->tdr_cmd.cmd.command = SWAP16(CmdTDR);
616 DMA_WBACK(dev, &(dma->tdr_cmd), sizeof(struct tdr_cmd));
617 i596_add_cmd(dev, &dma->tdr_cmd.cmd);
618
619 spin_lock_irqsave (&lp->lock, flags);
620
621 if (wait_cmd(dev, dma, 1000, "timed out waiting to issue RX_START")) {
622 spin_unlock_irqrestore (&lp->lock, flags);
623 goto failed_free_irq;
624 }
625 DEB(DEB_INIT, printk(KERN_DEBUG "%s: Issuing RX_START\n", dev->name));
626 dma->scb.command = SWAP16(RX_START);
627 dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
628 DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
629
630 ca(dev);
631
632 spin_unlock_irqrestore (&lp->lock, flags);
633 if (wait_cmd(dev, dma, 1000, "RX_START not processed"))
634 goto failed_free_irq;
635 DEB(DEB_INIT, printk(KERN_DEBUG
636 "%s: Receive unit started OK\n", dev->name));
637 return 0;
638
639 failed_free_irq:
640 free_irq(dev->irq, dev);
641 failed:
642 printk(KERN_ERR "%s: Failed to initialise 82596\n", dev->name);
643 mpu_port(dev, PORT_RESET, 0);
644 return -1;
645 }
646
647
648 static inline int i596_rx(struct net_device *dev)
649 {
650 struct i596_private *lp = netdev_priv(dev);
651 struct i596_rfd *rfd;
652 struct i596_rbd *rbd;
653 int frames = 0;
654
655 DEB(DEB_RXFRAME, printk(KERN_DEBUG
656 "i596_rx(), rfd_head %p, rbd_head %p\n",
657 lp->rfd_head, lp->rbd_head));
658
659
660 rfd = lp->rfd_head; /* Ref next frame to check */
661
662 DMA_INV(dev, rfd, sizeof(struct i596_rfd));
663 while (rfd->stat & SWAP16(STAT_C)) { /* Loop while complete frames */
664 if (rfd->rbd == I596_NULL)
665 rbd = NULL;
666 else if (rfd->rbd == lp->rbd_head->b_addr) {
667 rbd = lp->rbd_head;
668 DMA_INV(dev, rbd, sizeof(struct i596_rbd));
669 } else {
670 printk(KERN_ERR "%s: rbd chain broken!\n", dev->name);
671 /* XXX Now what? */
672 rbd = NULL;
673 }
674 DEB(DEB_RXFRAME, printk(KERN_DEBUG
675 " rfd %p, rfd.rbd %08x, rfd.stat %04x\n",
676 rfd, rfd->rbd, rfd->stat));
677
678 if (rbd != NULL && (rfd->stat & SWAP16(STAT_OK))) {
679 /* a good frame */
680 int pkt_len = SWAP16(rbd->count) & 0x3fff;
681 struct sk_buff *skb = rbd->skb;
682 int rx_in_place = 0;
683
684 DEB(DEB_RXADDR, print_eth(rbd->v_data, "received"));
685 frames++;
686
687 /* Check if the packet is long enough to just accept
688 * without copying to a properly sized skbuff.
689 */
690
691 if (pkt_len > rx_copybreak) {
692 struct sk_buff *newskb;
693 dma_addr_t dma_addr;
694
695 dma_unmap_single(dev->dev.parent,
696 (dma_addr_t)SWAP32(rbd->b_data),
697 PKT_BUF_SZ, DMA_FROM_DEVICE);
698 /* Get fresh skbuff to replace filled one. */
699 newskb = netdev_alloc_skb_ip_align(dev,
700 PKT_BUF_SZ);
701 if (newskb == NULL) {
702 skb = NULL; /* drop pkt */
703 goto memory_squeeze;
704 }
705
706 /* Pass up the skb already on the Rx ring. */
707 skb_put(skb, pkt_len);
708 rx_in_place = 1;
709 rbd->skb = newskb;
710 dma_addr = dma_map_single(dev->dev.parent,
711 newskb->data,
712 PKT_BUF_SZ,
713 DMA_FROM_DEVICE);
714 rbd->v_data = newskb->data;
715 rbd->b_data = SWAP32(dma_addr);
716 DMA_WBACK_INV(dev, rbd, sizeof(struct i596_rbd));
717 } else {
718 skb = netdev_alloc_skb_ip_align(dev, pkt_len);
719 }
720 memory_squeeze:
721 if (skb == NULL) {
722 /* XXX tulip.c can defer packets here!! */
723 dev->stats.rx_dropped++;
724 } else {
725 if (!rx_in_place) {
726 /* 16 byte align the data fields */
727 dma_sync_single_for_cpu(dev->dev.parent,
728 (dma_addr_t)SWAP32(rbd->b_data),
729 PKT_BUF_SZ, DMA_FROM_DEVICE);
730 skb_put_data(skb, rbd->v_data,
731 pkt_len);
732 dma_sync_single_for_device(dev->dev.parent,
733 (dma_addr_t)SWAP32(rbd->b_data),
734 PKT_BUF_SZ, DMA_FROM_DEVICE);
735 }
736 skb->len = pkt_len;
737 skb->protocol = eth_type_trans(skb, dev);
738 netif_rx(skb);
739 dev->stats.rx_packets++;
740 dev->stats.rx_bytes += pkt_len;
741 }
742 } else {
743 DEB(DEB_ERRORS, printk(KERN_DEBUG
744 "%s: Error, rfd.stat = 0x%04x\n",
745 dev->name, rfd->stat));
746 dev->stats.rx_errors++;
747 if (rfd->stat & SWAP16(0x0100))
748 dev->stats.collisions++;
749 if (rfd->stat & SWAP16(0x8000))
750 dev->stats.rx_length_errors++;
751 if (rfd->stat & SWAP16(0x0001))
752 dev->stats.rx_over_errors++;
753 if (rfd->stat & SWAP16(0x0002))
754 dev->stats.rx_fifo_errors++;
755 if (rfd->stat & SWAP16(0x0004))
756 dev->stats.rx_frame_errors++;
757 if (rfd->stat & SWAP16(0x0008))
758 dev->stats.rx_crc_errors++;
759 if (rfd->stat & SWAP16(0x0010))
760 dev->stats.rx_length_errors++;
761 }
762
763 /* Clear the buffer descriptor count and EOF + F flags */
764
765 if (rbd != NULL && (rbd->count & SWAP16(0x4000))) {
766 rbd->count = 0;
767 lp->rbd_head = rbd->v_next;
768 DMA_WBACK_INV(dev, rbd, sizeof(struct i596_rbd));
769 }
770
771 /* Tidy the frame descriptor, marking it as end of list */
772
773 rfd->rbd = I596_NULL;
774 rfd->stat = 0;
775 rfd->cmd = SWAP16(CMD_EOL|CMD_FLEX);
776 rfd->count = 0;
777
778 /* Update record of next frame descriptor to process */
779
780 lp->dma->scb.rfd = rfd->b_next;
781 lp->rfd_head = rfd->v_next;
782 DMA_WBACK_INV(dev, rfd, sizeof(struct i596_rfd));
783
784 /* Remove end-of-list from old end descriptor */
785
786 rfd->v_prev->cmd = SWAP16(CMD_FLEX);
787 DMA_WBACK_INV(dev, rfd->v_prev, sizeof(struct i596_rfd));
788 rfd = lp->rfd_head;
789 DMA_INV(dev, rfd, sizeof(struct i596_rfd));
790 }
791
792 DEB(DEB_RXFRAME, printk(KERN_DEBUG "frames %d\n", frames));
793
794 return 0;
795 }
796
797
798 static inline void i596_cleanup_cmd(struct net_device *dev, struct i596_private *lp)
799 {
800 struct i596_cmd *ptr;
801
802 while (lp->cmd_head != NULL) {
803 ptr = lp->cmd_head;
804 lp->cmd_head = ptr->v_next;
805 lp->cmd_backlog--;
806
807 switch (SWAP16(ptr->command) & 0x7) {
808 case CmdTx:
809 {
810 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
811 struct sk_buff *skb = tx_cmd->skb;
812 dma_unmap_single(dev->dev.parent,
813 tx_cmd->dma_addr,
814 skb->len, DMA_TO_DEVICE);
815
816 dev_kfree_skb(skb);
817
818 dev->stats.tx_errors++;
819 dev->stats.tx_aborted_errors++;
820
821 ptr->v_next = NULL;
822 ptr->b_next = I596_NULL;
823 tx_cmd->cmd.command = 0; /* Mark as free */
824 break;
825 }
826 default:
827 ptr->v_next = NULL;
828 ptr->b_next = I596_NULL;
829 }
830 DMA_WBACK_INV(dev, ptr, sizeof(struct i596_cmd));
831 }
832
833 wait_cmd(dev, lp->dma, 100, "i596_cleanup_cmd timed out");
834 lp->dma->scb.cmd = I596_NULL;
835 DMA_WBACK(dev, &(lp->dma->scb), sizeof(struct i596_scb));
836 }
837
838
839 static inline void i596_reset(struct net_device *dev, struct i596_private *lp)
840 {
841 unsigned long flags;
842
843 DEB(DEB_RESET, printk(KERN_DEBUG "i596_reset\n"));
844
845 spin_lock_irqsave (&lp->lock, flags);
846
847 wait_cmd(dev, lp->dma, 100, "i596_reset timed out");
848
849 netif_stop_queue(dev);
850
851 /* FIXME: this command might cause an lpmc */
852 lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
853 DMA_WBACK(dev, &(lp->dma->scb), sizeof(struct i596_scb));
854 ca(dev);
855
856 /* wait for shutdown */
857 wait_cmd(dev, lp->dma, 1000, "i596_reset 2 timed out");
858 spin_unlock_irqrestore (&lp->lock, flags);
859
860 i596_cleanup_cmd(dev, lp);
861 i596_rx(dev);
862
863 netif_start_queue(dev);
864 init_i596_mem(dev);
865 }
866
867
868 static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd)
869 {
870 struct i596_private *lp = netdev_priv(dev);
871 struct i596_dma *dma = lp->dma;
872 unsigned long flags;
873
874 DEB(DEB_ADDCMD, printk(KERN_DEBUG "i596_add_cmd cmd_head %p\n",
875 lp->cmd_head));
876
877 cmd->status = 0;
878 cmd->command |= SWAP16(CMD_EOL | CMD_INTR);
879 cmd->v_next = NULL;
880 cmd->b_next = I596_NULL;
881 DMA_WBACK(dev, cmd, sizeof(struct i596_cmd));
882
883 spin_lock_irqsave (&lp->lock, flags);
884
885 if (lp->cmd_head != NULL) {
886 lp->cmd_tail->v_next = cmd;
887 lp->cmd_tail->b_next = SWAP32(virt_to_dma(lp, &cmd->status));
888 DMA_WBACK(dev, lp->cmd_tail, sizeof(struct i596_cmd));
889 } else {
890 lp->cmd_head = cmd;
891 wait_cmd(dev, dma, 100, "i596_add_cmd timed out");
892 dma->scb.cmd = SWAP32(virt_to_dma(lp, &cmd->status));
893 dma->scb.command = SWAP16(CUC_START);
894 DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
895 ca(dev);
896 }
897 lp->cmd_tail = cmd;
898 lp->cmd_backlog++;
899
900 spin_unlock_irqrestore (&lp->lock, flags);
901
902 if (lp->cmd_backlog > max_cmd_backlog) {
903 unsigned long tickssofar = jiffies - lp->last_cmd;
904
905 if (tickssofar < ticks_limit)
906 return;
907
908 printk(KERN_ERR
909 "%s: command unit timed out, status resetting.\n",
910 dev->name);
911 #if 1
912 i596_reset(dev, lp);
913 #endif
914 }
915 }
916
917 static int i596_open(struct net_device *dev)
918 {
919 DEB(DEB_OPEN, printk(KERN_DEBUG
920 "%s: i596_open() irq %d.\n", dev->name, dev->irq));
921
922 if (init_rx_bufs(dev)) {
923 printk(KERN_ERR "%s: Failed to init rx bufs\n", dev->name);
924 return -EAGAIN;
925 }
926 if (init_i596_mem(dev)) {
927 printk(KERN_ERR "%s: Failed to init memory\n", dev->name);
928 goto out_remove_rx_bufs;
929 }
930 netif_start_queue(dev);
931
932 return 0;
933
934 out_remove_rx_bufs:
935 remove_rx_bufs(dev);
936 return -EAGAIN;
937 }
938
939 static void i596_tx_timeout (struct net_device *dev)
940 {
941 struct i596_private *lp = netdev_priv(dev);
942
943 /* Transmitter timeout, serious problems. */
944 DEB(DEB_ERRORS, printk(KERN_DEBUG
945 "%s: transmit timed out, status resetting.\n",
946 dev->name));
947
948 dev->stats.tx_errors++;
949
950 /* Try to restart the adaptor */
951 if (lp->last_restart == dev->stats.tx_packets) {
952 DEB(DEB_ERRORS, printk(KERN_DEBUG "Resetting board.\n"));
953 /* Shutdown and restart */
954 i596_reset (dev, lp);
955 } else {
956 /* Issue a channel attention signal */
957 DEB(DEB_ERRORS, printk(KERN_DEBUG "Kicking board.\n"));
958 lp->dma->scb.command = SWAP16(CUC_START | RX_START);
959 DMA_WBACK_INV(dev, &(lp->dma->scb), sizeof(struct i596_scb));
960 ca (dev);
961 lp->last_restart = dev->stats.tx_packets;
962 }
963
964 netif_trans_update(dev); /* prevent tx timeout */
965 netif_wake_queue (dev);
966 }
967
968
969 static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev)
970 {
971 struct i596_private *lp = netdev_priv(dev);
972 struct tx_cmd *tx_cmd;
973 struct i596_tbd *tbd;
974 short length = skb->len;
975
976 DEB(DEB_STARTTX, printk(KERN_DEBUG
977 "%s: i596_start_xmit(%x,%p) called\n",
978 dev->name, skb->len, skb->data));
979
980 if (length < ETH_ZLEN) {
981 if (skb_padto(skb, ETH_ZLEN))
982 return NETDEV_TX_OK;
983 length = ETH_ZLEN;
984 }
985
986 netif_stop_queue(dev);
987
988 tx_cmd = lp->dma->tx_cmds + lp->next_tx_cmd;
989 tbd = lp->dma->tbds + lp->next_tx_cmd;
990
991 if (tx_cmd->cmd.command) {
992 DEB(DEB_ERRORS, printk(KERN_DEBUG
993 "%s: xmit ring full, dropping packet.\n",
994 dev->name));
995 dev->stats.tx_dropped++;
996
997 dev_kfree_skb_any(skb);
998 } else {
999 if (++lp->next_tx_cmd == TX_RING_SIZE)
1000 lp->next_tx_cmd = 0;
1001 tx_cmd->tbd = SWAP32(virt_to_dma(lp, tbd));
1002 tbd->next = I596_NULL;
1003
1004 tx_cmd->cmd.command = SWAP16(CMD_FLEX | CmdTx);
1005 tx_cmd->skb = skb;
1006
1007 tx_cmd->pad = 0;
1008 tx_cmd->size = 0;
1009 tbd->pad = 0;
1010 tbd->size = SWAP16(EOF | length);
1011
1012 tx_cmd->dma_addr = dma_map_single(dev->dev.parent, skb->data,
1013 skb->len, DMA_TO_DEVICE);
1014 tbd->data = SWAP32(tx_cmd->dma_addr);
1015
1016 DEB(DEB_TXADDR, print_eth(skb->data, "tx-queued"));
1017 DMA_WBACK_INV(dev, tx_cmd, sizeof(struct tx_cmd));
1018 DMA_WBACK_INV(dev, tbd, sizeof(struct i596_tbd));
1019 i596_add_cmd(dev, &tx_cmd->cmd);
1020
1021 dev->stats.tx_packets++;
1022 dev->stats.tx_bytes += length;
1023 }
1024
1025 netif_start_queue(dev);
1026
1027 return NETDEV_TX_OK;
1028 }
1029
1030 static void print_eth(unsigned char *add, char *str)
1031 {
1032 printk(KERN_DEBUG "i596 0x%p, %pM --> %pM %02X%02X, %s\n",
1033 add, add + 6, add, add[12], add[13], str);
1034 }
1035 static const struct net_device_ops i596_netdev_ops = {
1036 .ndo_open = i596_open,
1037 .ndo_stop = i596_close,
1038 .ndo_start_xmit = i596_start_xmit,
1039 .ndo_set_rx_mode = set_multicast_list,
1040 .ndo_tx_timeout = i596_tx_timeout,
1041 .ndo_validate_addr = eth_validate_addr,
1042 .ndo_set_mac_address = eth_mac_addr,
1043 #ifdef CONFIG_NET_POLL_CONTROLLER
1044 .ndo_poll_controller = i596_poll_controller,
1045 #endif
1046 };
1047
1048 static int i82596_probe(struct net_device *dev)
1049 {
1050 int i;
1051 struct i596_private *lp = netdev_priv(dev);
1052 struct i596_dma *dma;
1053
1054 /* This lot is ensure things have been cache line aligned. */
1055 BUILD_BUG_ON(sizeof(struct i596_rfd) != 32);
1056 BUILD_BUG_ON(sizeof(struct i596_rbd) & 31);
1057 BUILD_BUG_ON(sizeof(struct tx_cmd) & 31);
1058 BUILD_BUG_ON(sizeof(struct i596_tbd) != 32);
1059 #ifndef __LP64__
1060 BUILD_BUG_ON(sizeof(struct i596_dma) > 4096);
1061 #endif
1062
1063 if (!dev->base_addr || !dev->irq)
1064 return -ENODEV;
1065
1066 dma = dma_alloc_attrs(dev->dev.parent, sizeof(struct i596_dma),
1067 &lp->dma_addr, GFP_KERNEL,
1068 DMA_ATTR_NON_CONSISTENT);
1069 if (!dma) {
1070 printk(KERN_ERR "%s: Couldn't get shared memory\n", __FILE__);
1071 return -ENOMEM;
1072 }
1073
1074 dev->netdev_ops = &i596_netdev_ops;
1075 dev->watchdog_timeo = TX_TIMEOUT;
1076
1077 memset(dma, 0, sizeof(struct i596_dma));
1078 lp->dma = dma;
1079
1080 dma->scb.command = 0;
1081 dma->scb.cmd = I596_NULL;
1082 dma->scb.rfd = I596_NULL;
1083 spin_lock_init(&lp->lock);
1084
1085 DMA_WBACK_INV(dev, dma, sizeof(struct i596_dma));
1086
1087 i = register_netdev(dev);
1088 if (i) {
1089 dma_free_attrs(dev->dev.parent, sizeof(struct i596_dma),
1090 dma, lp->dma_addr, DMA_ATTR_NON_CONSISTENT);
1091 return i;
1092 }
1093
1094 DEB(DEB_PROBE, printk(KERN_INFO "%s: 82596 at %#3lx, %pM IRQ %d.\n",
1095 dev->name, dev->base_addr, dev->dev_addr,
1096 dev->irq));
1097 DEB(DEB_INIT, printk(KERN_INFO
1098 "%s: dma at 0x%p (%d bytes), lp->scb at 0x%p\n",
1099 dev->name, dma, (int)sizeof(struct i596_dma),
1100 &dma->scb));
1101
1102 return 0;
1103 }
1104
1105 #ifdef CONFIG_NET_POLL_CONTROLLER
1106 static void i596_poll_controller(struct net_device *dev)
1107 {
1108 disable_irq(dev->irq);
1109 i596_interrupt(dev->irq, dev);
1110 enable_irq(dev->irq);
1111 }
1112 #endif
1113
1114 static irqreturn_t i596_interrupt(int irq, void *dev_id)
1115 {
1116 struct net_device *dev = dev_id;
1117 struct i596_private *lp;
1118 struct i596_dma *dma;
1119 unsigned short status, ack_cmd = 0;
1120
1121 lp = netdev_priv(dev);
1122 dma = lp->dma;
1123
1124 spin_lock (&lp->lock);
1125
1126 wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1127 status = SWAP16(dma->scb.status);
1128
1129 DEB(DEB_INTS, printk(KERN_DEBUG
1130 "%s: i596 interrupt, IRQ %d, status %4.4x.\n",
1131 dev->name, dev->irq, status));
1132
1133 ack_cmd = status & 0xf000;
1134
1135 if (!ack_cmd) {
1136 DEB(DEB_ERRORS, printk(KERN_DEBUG
1137 "%s: interrupt with no events\n",
1138 dev->name));
1139 spin_unlock (&lp->lock);
1140 return IRQ_NONE;
1141 }
1142
1143 if ((status & 0x8000) || (status & 0x2000)) {
1144 struct i596_cmd *ptr;
1145
1146 if ((status & 0x8000))
1147 DEB(DEB_INTS,
1148 printk(KERN_DEBUG
1149 "%s: i596 interrupt completed command.\n",
1150 dev->name));
1151 if ((status & 0x2000))
1152 DEB(DEB_INTS,
1153 printk(KERN_DEBUG
1154 "%s: i596 interrupt command unit inactive %x.\n",
1155 dev->name, status & 0x0700));
1156
1157 while (lp->cmd_head != NULL) {
1158 DMA_INV(dev, lp->cmd_head, sizeof(struct i596_cmd));
1159 if (!(lp->cmd_head->status & SWAP16(STAT_C)))
1160 break;
1161
1162 ptr = lp->cmd_head;
1163
1164 DEB(DEB_STATUS,
1165 printk(KERN_DEBUG
1166 "cmd_head->status = %04x, ->command = %04x\n",
1167 SWAP16(lp->cmd_head->status),
1168 SWAP16(lp->cmd_head->command)));
1169 lp->cmd_head = ptr->v_next;
1170 lp->cmd_backlog--;
1171
1172 switch (SWAP16(ptr->command) & 0x7) {
1173 case CmdTx:
1174 {
1175 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
1176 struct sk_buff *skb = tx_cmd->skb;
1177
1178 if (ptr->status & SWAP16(STAT_OK)) {
1179 DEB(DEB_TXADDR,
1180 print_eth(skb->data, "tx-done"));
1181 } else {
1182 dev->stats.tx_errors++;
1183 if (ptr->status & SWAP16(0x0020))
1184 dev->stats.collisions++;
1185 if (!(ptr->status & SWAP16(0x0040)))
1186 dev->stats.tx_heartbeat_errors++;
1187 if (ptr->status & SWAP16(0x0400))
1188 dev->stats.tx_carrier_errors++;
1189 if (ptr->status & SWAP16(0x0800))
1190 dev->stats.collisions++;
1191 if (ptr->status & SWAP16(0x1000))
1192 dev->stats.tx_aborted_errors++;
1193 }
1194 dma_unmap_single(dev->dev.parent,
1195 tx_cmd->dma_addr,
1196 skb->len, DMA_TO_DEVICE);
1197 dev_kfree_skb_irq(skb);
1198
1199 tx_cmd->cmd.command = 0; /* Mark free */
1200 break;
1201 }
1202 case CmdTDR:
1203 {
1204 unsigned short status = SWAP16(((struct tdr_cmd *)ptr)->status);
1205
1206 if (status & 0x8000) {
1207 DEB(DEB_ANY,
1208 printk(KERN_DEBUG "%s: link ok.\n",
1209 dev->name));
1210 } else {
1211 if (status & 0x4000)
1212 printk(KERN_ERR
1213 "%s: Transceiver problem.\n",
1214 dev->name);
1215 if (status & 0x2000)
1216 printk(KERN_ERR
1217 "%s: Termination problem.\n",
1218 dev->name);
1219 if (status & 0x1000)
1220 printk(KERN_ERR
1221 "%s: Short circuit.\n",
1222 dev->name);
1223
1224 DEB(DEB_TDR,
1225 printk(KERN_DEBUG "%s: Time %d.\n",
1226 dev->name, status & 0x07ff));
1227 }
1228 break;
1229 }
1230 case CmdConfigure:
1231 /*
1232 * Zap command so set_multicast_list() know
1233 * it is free
1234 */
1235 ptr->command = 0;
1236 break;
1237 }
1238 ptr->v_next = NULL;
1239 ptr->b_next = I596_NULL;
1240 DMA_WBACK(dev, ptr, sizeof(struct i596_cmd));
1241 lp->last_cmd = jiffies;
1242 }
1243
1244 /* This mess is arranging that only the last of any outstanding
1245 * commands has the interrupt bit set. Should probably really
1246 * only add to the cmd queue when the CU is stopped.
1247 */
1248 ptr = lp->cmd_head;
1249 while ((ptr != NULL) && (ptr != lp->cmd_tail)) {
1250 struct i596_cmd *prev = ptr;
1251
1252 ptr->command &= SWAP16(0x1fff);
1253 ptr = ptr->v_next;
1254 DMA_WBACK_INV(dev, prev, sizeof(struct i596_cmd));
1255 }
1256
1257 if (lp->cmd_head != NULL)
1258 ack_cmd |= CUC_START;
1259 dma->scb.cmd = SWAP32(virt_to_dma(lp, &lp->cmd_head->status));
1260 DMA_WBACK_INV(dev, &dma->scb, sizeof(struct i596_scb));
1261 }
1262 if ((status & 0x1000) || (status & 0x4000)) {
1263 if ((status & 0x4000))
1264 DEB(DEB_INTS,
1265 printk(KERN_DEBUG
1266 "%s: i596 interrupt received a frame.\n",
1267 dev->name));
1268 i596_rx(dev);
1269 /* Only RX_START if stopped - RGH 07-07-96 */
1270 if (status & 0x1000) {
1271 if (netif_running(dev)) {
1272 DEB(DEB_ERRORS,
1273 printk(KERN_DEBUG
1274 "%s: i596 interrupt receive unit inactive, status 0x%x\n",
1275 dev->name, status));
1276 ack_cmd |= RX_START;
1277 dev->stats.rx_errors++;
1278 dev->stats.rx_fifo_errors++;
1279 rebuild_rx_bufs(dev);
1280 }
1281 }
1282 }
1283 wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1284 dma->scb.command = SWAP16(ack_cmd);
1285 DMA_WBACK(dev, &dma->scb, sizeof(struct i596_scb));
1286
1287 /* DANGER: I suspect that some kind of interrupt
1288 acknowledgement aside from acking the 82596 might be needed
1289 here... but it's running acceptably without */
1290
1291 ca(dev);
1292
1293 wait_cmd(dev, dma, 100, "i596 interrupt, exit timeout");
1294 DEB(DEB_INTS, printk(KERN_DEBUG "%s: exiting interrupt.\n", dev->name));
1295
1296 spin_unlock (&lp->lock);
1297 return IRQ_HANDLED;
1298 }
1299
1300 static int i596_close(struct net_device *dev)
1301 {
1302 struct i596_private *lp = netdev_priv(dev);
1303 unsigned long flags;
1304
1305 netif_stop_queue(dev);
1306
1307 DEB(DEB_INIT,
1308 printk(KERN_DEBUG
1309 "%s: Shutting down ethercard, status was %4.4x.\n",
1310 dev->name, SWAP16(lp->dma->scb.status)));
1311
1312 spin_lock_irqsave(&lp->lock, flags);
1313
1314 wait_cmd(dev, lp->dma, 100, "close1 timed out");
1315 lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
1316 DMA_WBACK(dev, &lp->dma->scb, sizeof(struct i596_scb));
1317
1318 ca(dev);
1319
1320 wait_cmd(dev, lp->dma, 100, "close2 timed out");
1321 spin_unlock_irqrestore(&lp->lock, flags);
1322 DEB(DEB_STRUCT, i596_display_data(dev));
1323 i596_cleanup_cmd(dev, lp);
1324
1325 free_irq(dev->irq, dev);
1326 remove_rx_bufs(dev);
1327
1328 return 0;
1329 }
1330
1331 /*
1332 * Set or clear the multicast filter for this adaptor.
1333 */
1334
1335 static void set_multicast_list(struct net_device *dev)
1336 {
1337 struct i596_private *lp = netdev_priv(dev);
1338 struct i596_dma *dma = lp->dma;
1339 int config = 0, cnt;
1340
1341 DEB(DEB_MULTI,
1342 printk(KERN_DEBUG
1343 "%s: set multicast list, %d entries, promisc %s, allmulti %s\n",
1344 dev->name, netdev_mc_count(dev),
1345 dev->flags & IFF_PROMISC ? "ON" : "OFF",
1346 dev->flags & IFF_ALLMULTI ? "ON" : "OFF"));
1347
1348 if ((dev->flags & IFF_PROMISC) &&
1349 !(dma->cf_cmd.i596_config[8] & 0x01)) {
1350 dma->cf_cmd.i596_config[8] |= 0x01;
1351 config = 1;
1352 }
1353 if (!(dev->flags & IFF_PROMISC) &&
1354 (dma->cf_cmd.i596_config[8] & 0x01)) {
1355 dma->cf_cmd.i596_config[8] &= ~0x01;
1356 config = 1;
1357 }
1358 if ((dev->flags & IFF_ALLMULTI) &&
1359 (dma->cf_cmd.i596_config[11] & 0x20)) {
1360 dma->cf_cmd.i596_config[11] &= ~0x20;
1361 config = 1;
1362 }
1363 if (!(dev->flags & IFF_ALLMULTI) &&
1364 !(dma->cf_cmd.i596_config[11] & 0x20)) {
1365 dma->cf_cmd.i596_config[11] |= 0x20;
1366 config = 1;
1367 }
1368 if (config) {
1369 if (dma->cf_cmd.cmd.command)
1370 printk(KERN_INFO
1371 "%s: config change request already queued\n",
1372 dev->name);
1373 else {
1374 dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
1375 DMA_WBACK_INV(dev, &dma->cf_cmd, sizeof(struct cf_cmd));
1376 i596_add_cmd(dev, &dma->cf_cmd.cmd);
1377 }
1378 }
1379
1380 cnt = netdev_mc_count(dev);
1381 if (cnt > MAX_MC_CNT) {
1382 cnt = MAX_MC_CNT;
1383 printk(KERN_NOTICE "%s: Only %d multicast addresses supported",
1384 dev->name, cnt);
1385 }
1386
1387 if (!netdev_mc_empty(dev)) {
1388 struct netdev_hw_addr *ha;
1389 unsigned char *cp;
1390 struct mc_cmd *cmd;
1391
1392 cmd = &dma->mc_cmd;
1393 cmd->cmd.command = SWAP16(CmdMulticastList);
1394 cmd->mc_cnt = SWAP16(netdev_mc_count(dev) * 6);
1395 cp = cmd->mc_addrs;
1396 netdev_for_each_mc_addr(ha, dev) {
1397 if (!cnt--)
1398 break;
1399 memcpy(cp, ha->addr, ETH_ALEN);
1400 if (i596_debug > 1)
1401 DEB(DEB_MULTI,
1402 printk(KERN_DEBUG
1403 "%s: Adding address %pM\n",
1404 dev->name, cp));
1405 cp += ETH_ALEN;
1406 }
1407 DMA_WBACK_INV(dev, &dma->mc_cmd, sizeof(struct mc_cmd));
1408 i596_add_cmd(dev, &cmd->cmd);
1409 }
1410 }
Linux with added FPC-III support