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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / net / ethernet / i825xx / lib82596.c
blob3efbd8dbb63dd27b268167b9ad9538a455ef86c8
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/init.h>
82 #include <linux/types.h>
83 #include <linux/bitops.h>
84 #include <linux/dma-mapping.h>
85 #include <linux/io.h>
86 #include <linux/irq.h>
87 #include <linux/gfp.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 (HZ/20)
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;
474
475 skb = netdev_alloc_skb_ip_align(dev, PKT_BUF_SZ);
476 if (skb == NULL)
477 return -1;
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_ip_align(dev,
701 PKT_BUF_SZ);
702 if (newskb == NULL) {
703 skb = NULL; /* drop pkt */
704 goto memory_squeeze;
705 }
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_ip_align(dev, pkt_len);
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 memcpy(skb_put(skb, pkt_len), rbd->v_data, pkt_len);
734 dma_sync_single_for_device(dev->dev.parent,
735 (dma_addr_t)SWAP32(rbd->b_data),
736 PKT_BUF_SZ, DMA_FROM_DEVICE);
737 }
738 skb->len = pkt_len;
739 skb->protocol = eth_type_trans(skb, dev);
740 netif_rx(skb);
741 dev->stats.rx_packets++;
742 dev->stats.rx_bytes += pkt_len;
743 }
744 } else {
745 DEB(DEB_ERRORS, printk(KERN_DEBUG
746 "%s: Error, rfd.stat = 0x%04x\n",
747 dev->name, rfd->stat));
748 dev->stats.rx_errors++;
749 if (rfd->stat & SWAP16(0x0100))
750 dev->stats.collisions++;
751 if (rfd->stat & SWAP16(0x8000))
752 dev->stats.rx_length_errors++;
753 if (rfd->stat & SWAP16(0x0001))
754 dev->stats.rx_over_errors++;
755 if (rfd->stat & SWAP16(0x0002))
756 dev->stats.rx_fifo_errors++;
757 if (rfd->stat & SWAP16(0x0004))
758 dev->stats.rx_frame_errors++;
759 if (rfd->stat & SWAP16(0x0008))
760 dev->stats.rx_crc_errors++;
761 if (rfd->stat & SWAP16(0x0010))
762 dev->stats.rx_length_errors++;
763 }
764
765 /* Clear the buffer descriptor count and EOF + F flags */
766
767 if (rbd != NULL && (rbd->count & SWAP16(0x4000))) {
768 rbd->count = 0;
769 lp->rbd_head = rbd->v_next;
770 DMA_WBACK_INV(dev, rbd, sizeof(struct i596_rbd));
771 }
772
773 /* Tidy the frame descriptor, marking it as end of list */
774
775 rfd->rbd = I596_NULL;
776 rfd->stat = 0;
777 rfd->cmd = SWAP16(CMD_EOL|CMD_FLEX);
778 rfd->count = 0;
779
780 /* Update record of next frame descriptor to process */
781
782 lp->dma->scb.rfd = rfd->b_next;
783 lp->rfd_head = rfd->v_next;
784 DMA_WBACK_INV(dev, rfd, sizeof(struct i596_rfd));
785
786 /* Remove end-of-list from old end descriptor */
787
788 rfd->v_prev->cmd = SWAP16(CMD_FLEX);
789 DMA_WBACK_INV(dev, rfd->v_prev, sizeof(struct i596_rfd));
790 rfd = lp->rfd_head;
791 DMA_INV(dev, rfd, sizeof(struct i596_rfd));
792 }
793
794 DEB(DEB_RXFRAME, printk(KERN_DEBUG "frames %d\n", frames));
795
796 return 0;
797 }
798
799
800 static inline void i596_cleanup_cmd(struct net_device *dev, struct i596_private *lp)
801 {
802 struct i596_cmd *ptr;
803
804 while (lp->cmd_head != NULL) {
805 ptr = lp->cmd_head;
806 lp->cmd_head = ptr->v_next;
807 lp->cmd_backlog--;
808
809 switch (SWAP16(ptr->command) & 0x7) {
810 case CmdTx:
811 {
812 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
813 struct sk_buff *skb = tx_cmd->skb;
814 dma_unmap_single(dev->dev.parent,
815 tx_cmd->dma_addr,
816 skb->len, DMA_TO_DEVICE);
817
818 dev_kfree_skb(skb);
819
820 dev->stats.tx_errors++;
821 dev->stats.tx_aborted_errors++;
822
823 ptr->v_next = NULL;
824 ptr->b_next = I596_NULL;
825 tx_cmd->cmd.command = 0; /* Mark as free */
826 break;
827 }
828 default:
829 ptr->v_next = NULL;
830 ptr->b_next = I596_NULL;
831 }
832 DMA_WBACK_INV(dev, ptr, sizeof(struct i596_cmd));
833 }
834
835 wait_cmd(dev, lp->dma, 100, "i596_cleanup_cmd timed out");
836 lp->dma->scb.cmd = I596_NULL;
837 DMA_WBACK(dev, &(lp->dma->scb), sizeof(struct i596_scb));
838 }
839
840
841 static inline void i596_reset(struct net_device *dev, struct i596_private *lp)
842 {
843 unsigned long flags;
844
845 DEB(DEB_RESET, printk(KERN_DEBUG "i596_reset\n"));
846
847 spin_lock_irqsave (&lp->lock, flags);
848
849 wait_cmd(dev, lp->dma, 100, "i596_reset timed out");
850
851 netif_stop_queue(dev);
852
853 /* FIXME: this command might cause an lpmc */
854 lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
855 DMA_WBACK(dev, &(lp->dma->scb), sizeof(struct i596_scb));
856 ca(dev);
857
858 /* wait for shutdown */
859 wait_cmd(dev, lp->dma, 1000, "i596_reset 2 timed out");
860 spin_unlock_irqrestore (&lp->lock, flags);
861
862 i596_cleanup_cmd(dev, lp);
863 i596_rx(dev);
864
865 netif_start_queue(dev);
866 init_i596_mem(dev);
867 }
868
869
870 static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd)
871 {
872 struct i596_private *lp = netdev_priv(dev);
873 struct i596_dma *dma = lp->dma;
874 unsigned long flags;
875
876 DEB(DEB_ADDCMD, printk(KERN_DEBUG "i596_add_cmd cmd_head %p\n",
877 lp->cmd_head));
878
879 cmd->status = 0;
880 cmd->command |= SWAP16(CMD_EOL | CMD_INTR);
881 cmd->v_next = NULL;
882 cmd->b_next = I596_NULL;
883 DMA_WBACK(dev, cmd, sizeof(struct i596_cmd));
884
885 spin_lock_irqsave (&lp->lock, flags);
886
887 if (lp->cmd_head != NULL) {
888 lp->cmd_tail->v_next = cmd;
889 lp->cmd_tail->b_next = SWAP32(virt_to_dma(lp, &cmd->status));
890 DMA_WBACK(dev, lp->cmd_tail, sizeof(struct i596_cmd));
891 } else {
892 lp->cmd_head = cmd;
893 wait_cmd(dev, dma, 100, "i596_add_cmd timed out");
894 dma->scb.cmd = SWAP32(virt_to_dma(lp, &cmd->status));
895 dma->scb.command = SWAP16(CUC_START);
896 DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
897 ca(dev);
898 }
899 lp->cmd_tail = cmd;
900 lp->cmd_backlog++;
901
902 spin_unlock_irqrestore (&lp->lock, flags);
903
904 if (lp->cmd_backlog > max_cmd_backlog) {
905 unsigned long tickssofar = jiffies - lp->last_cmd;
906
907 if (tickssofar < ticks_limit)
908 return;
909
910 printk(KERN_ERR
911 "%s: command unit timed out, status resetting.\n",
912 dev->name);
913 #if 1
914 i596_reset(dev, lp);
915 #endif
916 }
917 }
918
919 static int i596_open(struct net_device *dev)
920 {
921 DEB(DEB_OPEN, printk(KERN_DEBUG
922 "%s: i596_open() irq %d.\n", dev->name, dev->irq));
923
924 if (init_rx_bufs(dev)) {
925 printk(KERN_ERR "%s: Failed to init rx bufs\n", dev->name);
926 return -EAGAIN;
927 }
928 if (init_i596_mem(dev)) {
929 printk(KERN_ERR "%s: Failed to init memory\n", dev->name);
930 goto out_remove_rx_bufs;
931 }
932 netif_start_queue(dev);
933
934 return 0;
935
936 out_remove_rx_bufs:
937 remove_rx_bufs(dev);
938 return -EAGAIN;
939 }
940
941 static void i596_tx_timeout (struct net_device *dev)
942 {
943 struct i596_private *lp = netdev_priv(dev);
944
945 /* Transmitter timeout, serious problems. */
946 DEB(DEB_ERRORS, printk(KERN_DEBUG
947 "%s: transmit timed out, status resetting.\n",
948 dev->name));
949
950 dev->stats.tx_errors++;
951
952 /* Try to restart the adaptor */
953 if (lp->last_restart == dev->stats.tx_packets) {
954 DEB(DEB_ERRORS, printk(KERN_DEBUG "Resetting board.\n"));
955 /* Shutdown and restart */
956 i596_reset (dev, lp);
957 } else {
958 /* Issue a channel attention signal */
959 DEB(DEB_ERRORS, printk(KERN_DEBUG "Kicking board.\n"));
960 lp->dma->scb.command = SWAP16(CUC_START | RX_START);
961 DMA_WBACK_INV(dev, &(lp->dma->scb), sizeof(struct i596_scb));
962 ca (dev);
963 lp->last_restart = dev->stats.tx_packets;
964 }
965
966 dev->trans_start = jiffies; /* prevent tx timeout */
967 netif_wake_queue (dev);
968 }
969
970
971 static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev)
972 {
973 struct i596_private *lp = netdev_priv(dev);
974 struct tx_cmd *tx_cmd;
975 struct i596_tbd *tbd;
976 short length = skb->len;
977
978 DEB(DEB_STARTTX, printk(KERN_DEBUG
979 "%s: i596_start_xmit(%x,%p) called\n",
980 dev->name, skb->len, skb->data));
981
982 if (length < ETH_ZLEN) {
983 if (skb_padto(skb, ETH_ZLEN))
984 return NETDEV_TX_OK;
985 length = ETH_ZLEN;
986 }
987
988 netif_stop_queue(dev);
989
990 tx_cmd = lp->dma->tx_cmds + lp->next_tx_cmd;
991 tbd = lp->dma->tbds + lp->next_tx_cmd;
992
993 if (tx_cmd->cmd.command) {
994 DEB(DEB_ERRORS, printk(KERN_DEBUG
995 "%s: xmit ring full, dropping packet.\n",
996 dev->name));
997 dev->stats.tx_dropped++;
998
999 dev_kfree_skb(skb);
1000 } else {
1001 if (++lp->next_tx_cmd == TX_RING_SIZE)
1002 lp->next_tx_cmd = 0;
1003 tx_cmd->tbd = SWAP32(virt_to_dma(lp, tbd));
1004 tbd->next = I596_NULL;
1005
1006 tx_cmd->cmd.command = SWAP16(CMD_FLEX | CmdTx);
1007 tx_cmd->skb = skb;
1008
1009 tx_cmd->pad = 0;
1010 tx_cmd->size = 0;
1011 tbd->pad = 0;
1012 tbd->size = SWAP16(EOF | length);
1013
1014 tx_cmd->dma_addr = dma_map_single(dev->dev.parent, skb->data,
1015 skb->len, DMA_TO_DEVICE);
1016 tbd->data = SWAP32(tx_cmd->dma_addr);
1017
1018 DEB(DEB_TXADDR, print_eth(skb->data, "tx-queued"));
1019 DMA_WBACK_INV(dev, tx_cmd, sizeof(struct tx_cmd));
1020 DMA_WBACK_INV(dev, tbd, sizeof(struct i596_tbd));
1021 i596_add_cmd(dev, &tx_cmd->cmd);
1022
1023 dev->stats.tx_packets++;
1024 dev->stats.tx_bytes += length;
1025 }
1026
1027 netif_start_queue(dev);
1028
1029 return NETDEV_TX_OK;
1030 }
1031
1032 static void print_eth(unsigned char *add, char *str)
1033 {
1034 printk(KERN_DEBUG "i596 0x%p, %pM --> %pM %02X%02X, %s\n",
1035 add, add + 6, add, add[12], add[13], str);
1036 }
1037 static const struct net_device_ops i596_netdev_ops = {
1038 .ndo_open = i596_open,
1039 .ndo_stop = i596_close,
1040 .ndo_start_xmit = i596_start_xmit,
1041 .ndo_set_rx_mode = set_multicast_list,
1042 .ndo_tx_timeout = i596_tx_timeout,
1043 .ndo_change_mtu = eth_change_mtu,
1044 .ndo_validate_addr = eth_validate_addr,
1045 .ndo_set_mac_address = eth_mac_addr,
1046 #ifdef CONFIG_NET_POLL_CONTROLLER
1047 .ndo_poll_controller = i596_poll_controller,
1048 #endif
1049 };
1050
1051 static int __devinit i82596_probe(struct net_device *dev)
1052 {
1053 int i;
1054 struct i596_private *lp = netdev_priv(dev);
1055 struct i596_dma *dma;
1056
1057 /* This lot is ensure things have been cache line aligned. */
1058 BUILD_BUG_ON(sizeof(struct i596_rfd) != 32);
1059 BUILD_BUG_ON(sizeof(struct i596_rbd) & 31);
1060 BUILD_BUG_ON(sizeof(struct tx_cmd) & 31);
1061 BUILD_BUG_ON(sizeof(struct i596_tbd) != 32);
1062 #ifndef __LP64__
1063 BUILD_BUG_ON(sizeof(struct i596_dma) > 4096);
1064 #endif
1065
1066 if (!dev->base_addr || !dev->irq)
1067 return -ENODEV;
1068
1069 dma = (struct i596_dma *) DMA_ALLOC(dev->dev.parent,
1070 sizeof(struct i596_dma), &lp->dma_addr, GFP_KERNEL);
1071 if (!dma) {
1072 printk(KERN_ERR "%s: Couldn't get shared memory\n", __FILE__);
1073 return -ENOMEM;
1074 }
1075
1076 dev->netdev_ops = &i596_netdev_ops;
1077 dev->watchdog_timeo = TX_TIMEOUT;
1078
1079 memset(dma, 0, sizeof(struct i596_dma));
1080 lp->dma = dma;
1081
1082 dma->scb.command = 0;
1083 dma->scb.cmd = I596_NULL;
1084 dma->scb.rfd = I596_NULL;
1085 spin_lock_init(&lp->lock);
1086
1087 DMA_WBACK_INV(dev, dma, sizeof(struct i596_dma));
1088
1089 i = register_netdev(dev);
1090 if (i) {
1091 DMA_FREE(dev->dev.parent, sizeof(struct i596_dma),
1092 (void *)dma, lp->dma_addr);
1093 return i;
1094 }
1095
1096 DEB(DEB_PROBE, printk(KERN_INFO "%s: 82596 at %#3lx, %pM IRQ %d.\n",
1097 dev->name, dev->base_addr, dev->dev_addr,
1098 dev->irq));
1099 DEB(DEB_INIT, printk(KERN_INFO
1100 "%s: dma at 0x%p (%d bytes), lp->scb at 0x%p\n",
1101 dev->name, dma, (int)sizeof(struct i596_dma),
1102 &dma->scb));
1103
1104 return 0;
1105 }
1106
1107 #ifdef CONFIG_NET_POLL_CONTROLLER
1108 static void i596_poll_controller(struct net_device *dev)
1109 {
1110 disable_irq(dev->irq);
1111 i596_interrupt(dev->irq, dev);
1112 enable_irq(dev->irq);
1113 }
1114 #endif
1115
1116 static irqreturn_t i596_interrupt(int irq, void *dev_id)
1117 {
1118 struct net_device *dev = dev_id;
1119 struct i596_private *lp;
1120 struct i596_dma *dma;
1121 unsigned short status, ack_cmd = 0;
1122
1123 lp = netdev_priv(dev);
1124 dma = lp->dma;
1125
1126 spin_lock (&lp->lock);
1127
1128 wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1129 status = SWAP16(dma->scb.status);
1130
1131 DEB(DEB_INTS, printk(KERN_DEBUG
1132 "%s: i596 interrupt, IRQ %d, status %4.4x.\n",
1133 dev->name, dev->irq, status));
1134
1135 ack_cmd = status & 0xf000;
1136
1137 if (!ack_cmd) {
1138 DEB(DEB_ERRORS, printk(KERN_DEBUG
1139 "%s: interrupt with no events\n",
1140 dev->name));
1141 spin_unlock (&lp->lock);
1142 return IRQ_NONE;
1143 }
1144
1145 if ((status & 0x8000) || (status & 0x2000)) {
1146 struct i596_cmd *ptr;
1147
1148 if ((status & 0x8000))
1149 DEB(DEB_INTS,
1150 printk(KERN_DEBUG
1151 "%s: i596 interrupt completed command.\n",
1152 dev->name));
1153 if ((status & 0x2000))
1154 DEB(DEB_INTS,
1155 printk(KERN_DEBUG
1156 "%s: i596 interrupt command unit inactive %x.\n",
1157 dev->name, status & 0x0700));
1158
1159 while (lp->cmd_head != NULL) {
1160 DMA_INV(dev, lp->cmd_head, sizeof(struct i596_cmd));
1161 if (!(lp->cmd_head->status & SWAP16(STAT_C)))
1162 break;
1163
1164 ptr = lp->cmd_head;
1165
1166 DEB(DEB_STATUS,
1167 printk(KERN_DEBUG
1168 "cmd_head->status = %04x, ->command = %04x\n",
1169 SWAP16(lp->cmd_head->status),
1170 SWAP16(lp->cmd_head->command)));
1171 lp->cmd_head = ptr->v_next;
1172 lp->cmd_backlog--;
1173
1174 switch (SWAP16(ptr->command) & 0x7) {
1175 case CmdTx:
1176 {
1177 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
1178 struct sk_buff *skb = tx_cmd->skb;
1179
1180 if (ptr->status & SWAP16(STAT_OK)) {
1181 DEB(DEB_TXADDR,
1182 print_eth(skb->data, "tx-done"));
1183 } else {
1184 dev->stats.tx_errors++;
1185 if (ptr->status & SWAP16(0x0020))
1186 dev->stats.collisions++;
1187 if (!(ptr->status & SWAP16(0x0040)))
1188 dev->stats.tx_heartbeat_errors++;
1189 if (ptr->status & SWAP16(0x0400))
1190 dev->stats.tx_carrier_errors++;
1191 if (ptr->status & SWAP16(0x0800))
1192 dev->stats.collisions++;
1193 if (ptr->status & SWAP16(0x1000))
1194 dev->stats.tx_aborted_errors++;
1195 }
1196 dma_unmap_single(dev->dev.parent,
1197 tx_cmd->dma_addr,
1198 skb->len, DMA_TO_DEVICE);
1199 dev_kfree_skb_irq(skb);
1200
1201 tx_cmd->cmd.command = 0; /* Mark free */
1202 break;
1203 }
1204 case CmdTDR:
1205 {
1206 unsigned short status = SWAP16(((struct tdr_cmd *)ptr)->status);
1207
1208 if (status & 0x8000) {
1209 DEB(DEB_ANY,
1210 printk(KERN_DEBUG "%s: link ok.\n",
1211 dev->name));
1212 } else {
1213 if (status & 0x4000)
1214 printk(KERN_ERR
1215 "%s: Transceiver problem.\n",
1216 dev->name);
1217 if (status & 0x2000)
1218 printk(KERN_ERR
1219 "%s: Termination problem.\n",
1220 dev->name);
1221 if (status & 0x1000)
1222 printk(KERN_ERR
1223 "%s: Short circuit.\n",
1224 dev->name);
1225
1226 DEB(DEB_TDR,
1227 printk(KERN_DEBUG "%s: Time %d.\n",
1228 dev->name, status & 0x07ff));
1229 }
1230 break;
1231 }
1232 case CmdConfigure:
1233 /*
1234 * Zap command so set_multicast_list() know
1235 * it is free
1236 */
1237 ptr->command = 0;
1238 break;
1239 }
1240 ptr->v_next = NULL;
1241 ptr->b_next = I596_NULL;
1242 DMA_WBACK(dev, ptr, sizeof(struct i596_cmd));
1243 lp->last_cmd = jiffies;
1244 }
1245
1246 /* This mess is arranging that only the last of any outstanding
1247 * commands has the interrupt bit set. Should probably really
1248 * only add to the cmd queue when the CU is stopped.
1249 */
1250 ptr = lp->cmd_head;
1251 while ((ptr != NULL) && (ptr != lp->cmd_tail)) {
1252 struct i596_cmd *prev = ptr;
1253
1254 ptr->command &= SWAP16(0x1fff);
1255 ptr = ptr->v_next;
1256 DMA_WBACK_INV(dev, prev, sizeof(struct i596_cmd));
1257 }
1258
1259 if (lp->cmd_head != NULL)
1260 ack_cmd |= CUC_START;
1261 dma->scb.cmd = SWAP32(virt_to_dma(lp, &lp->cmd_head->status));
1262 DMA_WBACK_INV(dev, &dma->scb, sizeof(struct i596_scb));
1263 }
1264 if ((status & 0x1000) || (status & 0x4000)) {
1265 if ((status & 0x4000))
1266 DEB(DEB_INTS,
1267 printk(KERN_DEBUG
1268 "%s: i596 interrupt received a frame.\n",
1269 dev->name));
1270 i596_rx(dev);
1271 /* Only RX_START if stopped - RGH 07-07-96 */
1272 if (status & 0x1000) {
1273 if (netif_running(dev)) {
1274 DEB(DEB_ERRORS,
1275 printk(KERN_DEBUG
1276 "%s: i596 interrupt receive unit inactive, status 0x%x\n",
1277 dev->name, status));
1278 ack_cmd |= RX_START;
1279 dev->stats.rx_errors++;
1280 dev->stats.rx_fifo_errors++;
1281 rebuild_rx_bufs(dev);
1282 }
1283 }
1284 }
1285 wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1286 dma->scb.command = SWAP16(ack_cmd);
1287 DMA_WBACK(dev, &dma->scb, sizeof(struct i596_scb));
1288
1289 /* DANGER: I suspect that some kind of interrupt
1290 acknowledgement aside from acking the 82596 might be needed
1291 here... but it's running acceptably without */
1292
1293 ca(dev);
1294
1295 wait_cmd(dev, dma, 100, "i596 interrupt, exit timeout");
1296 DEB(DEB_INTS, printk(KERN_DEBUG "%s: exiting interrupt.\n", dev->name));
1297
1298 spin_unlock (&lp->lock);
1299 return IRQ_HANDLED;
1300 }
1301
1302 static int i596_close(struct net_device *dev)
1303 {
1304 struct i596_private *lp = netdev_priv(dev);
1305 unsigned long flags;
1306
1307 netif_stop_queue(dev);
1308
1309 DEB(DEB_INIT,
1310 printk(KERN_DEBUG
1311 "%s: Shutting down ethercard, status was %4.4x.\n",
1312 dev->name, SWAP16(lp->dma->scb.status)));
1313
1314 spin_lock_irqsave(&lp->lock, flags);
1315
1316 wait_cmd(dev, lp->dma, 100, "close1 timed out");
1317 lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
1318 DMA_WBACK(dev, &lp->dma->scb, sizeof(struct i596_scb));
1319
1320 ca(dev);
1321
1322 wait_cmd(dev, lp->dma, 100, "close2 timed out");
1323 spin_unlock_irqrestore(&lp->lock, flags);
1324 DEB(DEB_STRUCT, i596_display_data(dev));
1325 i596_cleanup_cmd(dev, lp);
1326
1327 free_irq(dev->irq, dev);
1328 remove_rx_bufs(dev);
1329
1330 return 0;
1331 }
1332
1333 /*
1334 * Set or clear the multicast filter for this adaptor.
1335 */
1336
1337 static void set_multicast_list(struct net_device *dev)
1338 {
1339 struct i596_private *lp = netdev_priv(dev);
1340 struct i596_dma *dma = lp->dma;
1341 int config = 0, cnt;
1342
1343 DEB(DEB_MULTI,
1344 printk(KERN_DEBUG
1345 "%s: set multicast list, %d entries, promisc %s, allmulti %s\n",
1346 dev->name, netdev_mc_count(dev),
1347 dev->flags & IFF_PROMISC ? "ON" : "OFF",
1348 dev->flags & IFF_ALLMULTI ? "ON" : "OFF"));
1349
1350 if ((dev->flags & IFF_PROMISC) &&
1351 !(dma->cf_cmd.i596_config[8] & 0x01)) {
1352 dma->cf_cmd.i596_config[8] |= 0x01;
1353 config = 1;
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_ALLMULTI) &&
1361 (dma->cf_cmd.i596_config[11] & 0x20)) {
1362 dma->cf_cmd.i596_config[11] &= ~0x20;
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 (config) {
1371 if (dma->cf_cmd.cmd.command)
1372 printk(KERN_INFO
1373 "%s: config change request already queued\n",
1374 dev->name);
1375 else {
1376 dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
1377 DMA_WBACK_INV(dev, &dma->cf_cmd, sizeof(struct cf_cmd));
1378 i596_add_cmd(dev, &dma->cf_cmd.cmd);
1379 }
1380 }
1381
1382 cnt = netdev_mc_count(dev);
1383 if (cnt > MAX_MC_CNT) {
1384 cnt = MAX_MC_CNT;
1385 printk(KERN_NOTICE "%s: Only %d multicast addresses supported",
1386 dev->name, cnt);
1387 }
1388
1389 if (!netdev_mc_empty(dev)) {
1390 struct netdev_hw_addr *ha;
1391 unsigned char *cp;
1392 struct mc_cmd *cmd;
1393
1394 cmd = &dma->mc_cmd;
1395 cmd->cmd.command = SWAP16(CmdMulticastList);
1396 cmd->mc_cnt = SWAP16(netdev_mc_count(dev) * 6);
1397 cp = cmd->mc_addrs;
1398 netdev_for_each_mc_addr(ha, dev) {
1399 if (!cnt--)
1400 break;
1401 memcpy(cp, ha->addr, 6);
1402 if (i596_debug > 1)
1403 DEB(DEB_MULTI,
1404 printk(KERN_DEBUG
1405 "%s: Adding address %pM\n",
1406 dev->name, cp));
1407 cp += 6;
1408 }
1409 DMA_WBACK_INV(dev, &dma->mc_cmd, sizeof(struct mc_cmd));
1410 i596_add_cmd(dev, &cmd->cmd);
1411 }
1412 }