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USB: storage: add last-sector hacks
[linux-2.6/mini2440.git] / drivers / net / lib82596.c
blob7415f517491d73a6bfb7817e7f07c14f842a1923
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->stats.rx_packets++;
743 dev->stats.rx_bytes += pkt_len;
744 }
745 } else {
746 DEB(DEB_ERRORS, printk(KERN_DEBUG
747 "%s: Error, rfd.stat = 0x%04x\n",
748 dev->name, rfd->stat));
749 dev->stats.rx_errors++;
750 if (rfd->stat & SWAP16(0x0100))
751 dev->stats.collisions++;
752 if (rfd->stat & SWAP16(0x8000))
753 dev->stats.rx_length_errors++;
754 if (rfd->stat & SWAP16(0x0001))
755 dev->stats.rx_over_errors++;
756 if (rfd->stat & SWAP16(0x0002))
757 dev->stats.rx_fifo_errors++;
758 if (rfd->stat & SWAP16(0x0004))
759 dev->stats.rx_frame_errors++;
760 if (rfd->stat & SWAP16(0x0008))
761 dev->stats.rx_crc_errors++;
762 if (rfd->stat & SWAP16(0x0010))
763 dev->stats.rx_length_errors++;
764 }
765
766 /* Clear the buffer descriptor count and EOF + F flags */
767
768 if (rbd != NULL && (rbd->count & SWAP16(0x4000))) {
769 rbd->count = 0;
770 lp->rbd_head = rbd->v_next;
771 DMA_WBACK_INV(dev, rbd, sizeof(struct i596_rbd));
772 }
773
774 /* Tidy the frame descriptor, marking it as end of list */
775
776 rfd->rbd = I596_NULL;
777 rfd->stat = 0;
778 rfd->cmd = SWAP16(CMD_EOL|CMD_FLEX);
779 rfd->count = 0;
780
781 /* Update record of next frame descriptor to process */
782
783 lp->dma->scb.rfd = rfd->b_next;
784 lp->rfd_head = rfd->v_next;
785 DMA_WBACK_INV(dev, rfd, sizeof(struct i596_rfd));
786
787 /* Remove end-of-list from old end descriptor */
788
789 rfd->v_prev->cmd = SWAP16(CMD_FLEX);
790 DMA_WBACK_INV(dev, rfd->v_prev, sizeof(struct i596_rfd));
791 rfd = lp->rfd_head;
792 DMA_INV(dev, rfd, sizeof(struct i596_rfd));
793 }
794
795 DEB(DEB_RXFRAME, printk(KERN_DEBUG "frames %d\n", frames));
796
797 return 0;
798 }
799
800
801 static inline void i596_cleanup_cmd(struct net_device *dev, struct i596_private *lp)
802 {
803 struct i596_cmd *ptr;
804
805 while (lp->cmd_head != NULL) {
806 ptr = lp->cmd_head;
807 lp->cmd_head = ptr->v_next;
808 lp->cmd_backlog--;
809
810 switch (SWAP16(ptr->command) & 0x7) {
811 case CmdTx:
812 {
813 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
814 struct sk_buff *skb = tx_cmd->skb;
815 dma_unmap_single(dev->dev.parent,
816 tx_cmd->dma_addr,
817 skb->len, DMA_TO_DEVICE);
818
819 dev_kfree_skb(skb);
820
821 dev->stats.tx_errors++;
822 dev->stats.tx_aborted_errors++;
823
824 ptr->v_next = NULL;
825 ptr->b_next = I596_NULL;
826 tx_cmd->cmd.command = 0; /* Mark as free */
827 break;
828 }
829 default:
830 ptr->v_next = NULL;
831 ptr->b_next = I596_NULL;
832 }
833 DMA_WBACK_INV(dev, ptr, sizeof(struct i596_cmd));
834 }
835
836 wait_cmd(dev, lp->dma, 100, "i596_cleanup_cmd timed out");
837 lp->dma->scb.cmd = I596_NULL;
838 DMA_WBACK(dev, &(lp->dma->scb), sizeof(struct i596_scb));
839 }
840
841
842 static inline void i596_reset(struct net_device *dev, struct i596_private *lp)
843 {
844 unsigned long flags;
845
846 DEB(DEB_RESET, printk(KERN_DEBUG "i596_reset\n"));
847
848 spin_lock_irqsave (&lp->lock, flags);
849
850 wait_cmd(dev, lp->dma, 100, "i596_reset timed out");
851
852 netif_stop_queue(dev);
853
854 /* FIXME: this command might cause an lpmc */
855 lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
856 DMA_WBACK(dev, &(lp->dma->scb), sizeof(struct i596_scb));
857 ca(dev);
858
859 /* wait for shutdown */
860 wait_cmd(dev, lp->dma, 1000, "i596_reset 2 timed out");
861 spin_unlock_irqrestore (&lp->lock, flags);
862
863 i596_cleanup_cmd(dev, lp);
864 i596_rx(dev);
865
866 netif_start_queue(dev);
867 init_i596_mem(dev);
868 }
869
870
871 static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd)
872 {
873 struct i596_private *lp = netdev_priv(dev);
874 struct i596_dma *dma = lp->dma;
875 unsigned long flags;
876
877 DEB(DEB_ADDCMD, printk(KERN_DEBUG "i596_add_cmd cmd_head %p\n",
878 lp->cmd_head));
879
880 cmd->status = 0;
881 cmd->command |= SWAP16(CMD_EOL | CMD_INTR);
882 cmd->v_next = NULL;
883 cmd->b_next = I596_NULL;
884 DMA_WBACK(dev, cmd, sizeof(struct i596_cmd));
885
886 spin_lock_irqsave (&lp->lock, flags);
887
888 if (lp->cmd_head != NULL) {
889 lp->cmd_tail->v_next = cmd;
890 lp->cmd_tail->b_next = SWAP32(virt_to_dma(lp, &cmd->status));
891 DMA_WBACK(dev, lp->cmd_tail, sizeof(struct i596_cmd));
892 } else {
893 lp->cmd_head = cmd;
894 wait_cmd(dev, dma, 100, "i596_add_cmd timed out");
895 dma->scb.cmd = SWAP32(virt_to_dma(lp, &cmd->status));
896 dma->scb.command = SWAP16(CUC_START);
897 DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
898 ca(dev);
899 }
900 lp->cmd_tail = cmd;
901 lp->cmd_backlog++;
902
903 spin_unlock_irqrestore (&lp->lock, flags);
904
905 if (lp->cmd_backlog > max_cmd_backlog) {
906 unsigned long tickssofar = jiffies - lp->last_cmd;
907
908 if (tickssofar < ticks_limit)
909 return;
910
911 printk(KERN_ERR
912 "%s: command unit timed out, status resetting.\n",
913 dev->name);
914 #if 1
915 i596_reset(dev, lp);
916 #endif
917 }
918 }
919
920 static int i596_open(struct net_device *dev)
921 {
922 DEB(DEB_OPEN, printk(KERN_DEBUG
923 "%s: i596_open() irq %d.\n", dev->name, dev->irq));
924
925 if (init_rx_bufs(dev)) {
926 printk(KERN_ERR "%s: Failed to init rx bufs\n", dev->name);
927 return -EAGAIN;
928 }
929 if (init_i596_mem(dev)) {
930 printk(KERN_ERR "%s: Failed to init memory\n", dev->name);
931 goto out_remove_rx_bufs;
932 }
933 netif_start_queue(dev);
934
935 return 0;
936
937 out_remove_rx_bufs:
938 remove_rx_bufs(dev);
939 return -EAGAIN;
940 }
941
942 static void i596_tx_timeout (struct net_device *dev)
943 {
944 struct i596_private *lp = netdev_priv(dev);
945
946 /* Transmitter timeout, serious problems. */
947 DEB(DEB_ERRORS, printk(KERN_DEBUG
948 "%s: transmit timed out, status resetting.\n",
949 dev->name));
950
951 dev->stats.tx_errors++;
952
953 /* Try to restart the adaptor */
954 if (lp->last_restart == dev->stats.tx_packets) {
955 DEB(DEB_ERRORS, printk(KERN_DEBUG "Resetting board.\n"));
956 /* Shutdown and restart */
957 i596_reset (dev, lp);
958 } else {
959 /* Issue a channel attention signal */
960 DEB(DEB_ERRORS, printk(KERN_DEBUG "Kicking board.\n"));
961 lp->dma->scb.command = SWAP16(CUC_START | RX_START);
962 DMA_WBACK_INV(dev, &(lp->dma->scb), sizeof(struct i596_scb));
963 ca (dev);
964 lp->last_restart = dev->stats.tx_packets;
965 }
966
967 dev->trans_start = jiffies;
968 netif_wake_queue (dev);
969 }
970
971
972 static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev)
973 {
974 struct i596_private *lp = netdev_priv(dev);
975 struct tx_cmd *tx_cmd;
976 struct i596_tbd *tbd;
977 short length = skb->len;
978 dev->trans_start = jiffies;
979
980 DEB(DEB_STARTTX, printk(KERN_DEBUG
981 "%s: i596_start_xmit(%x,%p) called\n",
982 dev->name, skb->len, skb->data));
983
984 if (length < ETH_ZLEN) {
985 if (skb_padto(skb, ETH_ZLEN))
986 return 0;
987 length = ETH_ZLEN;
988 }
989
990 netif_stop_queue(dev);
991
992 tx_cmd = lp->dma->tx_cmds + lp->next_tx_cmd;
993 tbd = lp->dma->tbds + lp->next_tx_cmd;
994
995 if (tx_cmd->cmd.command) {
996 DEB(DEB_ERRORS, printk(KERN_DEBUG
997 "%s: xmit ring full, dropping packet.\n",
998 dev->name));
999 dev->stats.tx_dropped++;
1000
1001 dev_kfree_skb(skb);
1002 } else {
1003 if (++lp->next_tx_cmd == TX_RING_SIZE)
1004 lp->next_tx_cmd = 0;
1005 tx_cmd->tbd = SWAP32(virt_to_dma(lp, tbd));
1006 tbd->next = I596_NULL;
1007
1008 tx_cmd->cmd.command = SWAP16(CMD_FLEX | CmdTx);
1009 tx_cmd->skb = skb;
1010
1011 tx_cmd->pad = 0;
1012 tx_cmd->size = 0;
1013 tbd->pad = 0;
1014 tbd->size = SWAP16(EOF | length);
1015
1016 tx_cmd->dma_addr = dma_map_single(dev->dev.parent, skb->data,
1017 skb->len, DMA_TO_DEVICE);
1018 tbd->data = SWAP32(tx_cmd->dma_addr);
1019
1020 DEB(DEB_TXADDR, print_eth(skb->data, "tx-queued"));
1021 DMA_WBACK_INV(dev, tx_cmd, sizeof(struct tx_cmd));
1022 DMA_WBACK_INV(dev, tbd, sizeof(struct i596_tbd));
1023 i596_add_cmd(dev, &tx_cmd->cmd);
1024
1025 dev->stats.tx_packets++;
1026 dev->stats.tx_bytes += length;
1027 }
1028
1029 netif_start_queue(dev);
1030
1031 return 0;
1032 }
1033
1034 static void print_eth(unsigned char *add, char *str)
1035 {
1036 printk(KERN_DEBUG "i596 0x%p, %pM --> %pM %02X%02X, %s\n",
1037 add, add + 6, add, add[12], add[13], str);
1038 }
1039
1040 static int __devinit i82596_probe(struct net_device *dev)
1041 {
1042 int i;
1043 struct i596_private *lp = netdev_priv(dev);
1044 struct i596_dma *dma;
1045
1046 /* This lot is ensure things have been cache line aligned. */
1047 BUILD_BUG_ON(sizeof(struct i596_rfd) != 32);
1048 BUILD_BUG_ON(sizeof(struct i596_rbd) & 31);
1049 BUILD_BUG_ON(sizeof(struct tx_cmd) & 31);
1050 BUILD_BUG_ON(sizeof(struct i596_tbd) != 32);
1051 #ifndef __LP64__
1052 BUILD_BUG_ON(sizeof(struct i596_dma) > 4096);
1053 #endif
1054
1055 if (!dev->base_addr || !dev->irq)
1056 return -ENODEV;
1057
1058 dma = (struct i596_dma *) DMA_ALLOC(dev->dev.parent,
1059 sizeof(struct i596_dma), &lp->dma_addr, GFP_KERNEL);
1060 if (!dma) {
1061 printk(KERN_ERR "%s: Couldn't get shared memory\n", __FILE__);
1062 return -ENOMEM;
1063 }
1064
1065 /* The 82596-specific entries in the device structure. */
1066 dev->open = i596_open;
1067 dev->stop = i596_close;
1068 dev->hard_start_xmit = i596_start_xmit;
1069 dev->set_multicast_list = set_multicast_list;
1070 dev->tx_timeout = i596_tx_timeout;
1071 dev->watchdog_timeo = TX_TIMEOUT;
1072 #ifdef CONFIG_NET_POLL_CONTROLLER
1073 dev->poll_controller = i596_poll_controller;
1074 #endif
1075
1076 memset(dma, 0, sizeof(struct i596_dma));
1077 lp->dma = dma;
1078
1079 dma->scb.command = 0;
1080 dma->scb.cmd = I596_NULL;
1081 dma->scb.rfd = I596_NULL;
1082 spin_lock_init(&lp->lock);
1083
1084 DMA_WBACK_INV(dev, dma, sizeof(struct i596_dma));
1085
1086 i = register_netdev(dev);
1087 if (i) {
1088 DMA_FREE(dev->dev.parent, sizeof(struct i596_dma),
1089 (void *)dma, lp->dma_addr);
1090 return i;
1091 };
1092
1093 DEB(DEB_PROBE, printk(KERN_INFO "%s: 82596 at %#3lx,",
1094 dev->name, dev->base_addr));
1095 for (i = 0; i < 6; i++)
1096 DEB(DEB_PROBE, printk(" %2.2X", dev->dev_addr[i]));
1097 DEB(DEB_PROBE, printk(" IRQ %d.\n", dev->irq));
1098 DEB(DEB_INIT, printk(KERN_INFO
1099 "%s: dma at 0x%p (%d bytes), lp->scb at 0x%p\n",
1100 dev->name, dma, (int)sizeof(struct i596_dma),
1101 &dma->scb));
1102
1103 return 0;
1104 }
1105
1106 #ifdef CONFIG_NET_POLL_CONTROLLER
1107 static void i596_poll_controller(struct net_device *dev)
1108 {
1109 disable_irq(dev->irq);
1110 i596_interrupt(dev->irq, dev);
1111 enable_irq(dev->irq);
1112 }
1113 #endif
1114
1115 static irqreturn_t i596_interrupt(int irq, void *dev_id)
1116 {
1117 struct net_device *dev = dev_id;
1118 struct i596_private *lp;
1119 struct i596_dma *dma;
1120 unsigned short status, ack_cmd = 0;
1121
1122 lp = netdev_priv(dev);
1123 dma = lp->dma;
1124
1125 spin_lock (&lp->lock);
1126
1127 wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1128 status = SWAP16(dma->scb.status);
1129
1130 DEB(DEB_INTS, printk(KERN_DEBUG
1131 "%s: i596 interrupt, IRQ %d, status %4.4x.\n",
1132 dev->name, dev->irq, status));
1133
1134 ack_cmd = status & 0xf000;
1135
1136 if (!ack_cmd) {
1137 DEB(DEB_ERRORS, printk(KERN_DEBUG
1138 "%s: interrupt with no events\n",
1139 dev->name));
1140 spin_unlock (&lp->lock);
1141 return IRQ_NONE;
1142 }
1143
1144 if ((status & 0x8000) || (status & 0x2000)) {
1145 struct i596_cmd *ptr;
1146
1147 if ((status & 0x8000))
1148 DEB(DEB_INTS,
1149 printk(KERN_DEBUG
1150 "%s: i596 interrupt completed command.\n",
1151 dev->name));
1152 if ((status & 0x2000))
1153 DEB(DEB_INTS,
1154 printk(KERN_DEBUG
1155 "%s: i596 interrupt command unit inactive %x.\n",
1156 dev->name, status & 0x0700));
1157
1158 while (lp->cmd_head != NULL) {
1159 DMA_INV(dev, lp->cmd_head, sizeof(struct i596_cmd));
1160 if (!(lp->cmd_head->status & SWAP16(STAT_C)))
1161 break;
1162
1163 ptr = lp->cmd_head;
1164
1165 DEB(DEB_STATUS,
1166 printk(KERN_DEBUG
1167 "cmd_head->status = %04x, ->command = %04x\n",
1168 SWAP16(lp->cmd_head->status),
1169 SWAP16(lp->cmd_head->command)));
1170 lp->cmd_head = ptr->v_next;
1171 lp->cmd_backlog--;
1172
1173 switch (SWAP16(ptr->command) & 0x7) {
1174 case CmdTx:
1175 {
1176 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
1177 struct sk_buff *skb = tx_cmd->skb;
1178
1179 if (ptr->status & SWAP16(STAT_OK)) {
1180 DEB(DEB_TXADDR,
1181 print_eth(skb->data, "tx-done"));
1182 } else {
1183 dev->stats.tx_errors++;
1184 if (ptr->status & SWAP16(0x0020))
1185 dev->stats.collisions++;
1186 if (!(ptr->status & SWAP16(0x0040)))
1187 dev->stats.tx_heartbeat_errors++;
1188 if (ptr->status & SWAP16(0x0400))
1189 dev->stats.tx_carrier_errors++;
1190 if (ptr->status & SWAP16(0x0800))
1191 dev->stats.collisions++;
1192 if (ptr->status & SWAP16(0x1000))
1193 dev->stats.tx_aborted_errors++;
1194 }
1195 dma_unmap_single(dev->dev.parent,
1196 tx_cmd->dma_addr,
1197 skb->len, DMA_TO_DEVICE);
1198 dev_kfree_skb_irq(skb);
1199
1200 tx_cmd->cmd.command = 0; /* Mark free */
1201 break;
1202 }
1203 case CmdTDR:
1204 {
1205 unsigned short status = SWAP16(((struct tdr_cmd *)ptr)->status);
1206
1207 if (status & 0x8000) {
1208 DEB(DEB_ANY,
1209 printk(KERN_DEBUG "%s: link ok.\n",
1210 dev->name));
1211 } else {
1212 if (status & 0x4000)
1213 printk(KERN_ERR
1214 "%s: Transceiver problem.\n",
1215 dev->name);
1216 if (status & 0x2000)
1217 printk(KERN_ERR
1218 "%s: Termination problem.\n",
1219 dev->name);
1220 if (status & 0x1000)
1221 printk(KERN_ERR
1222 "%s: Short circuit.\n",
1223 dev->name);
1224
1225 DEB(DEB_TDR,
1226 printk(KERN_DEBUG "%s: Time %d.\n",
1227 dev->name, status & 0x07ff));
1228 }
1229 break;
1230 }
1231 case CmdConfigure:
1232 /*
1233 * Zap command so set_multicast_list() know
1234 * it is free
1235 */
1236 ptr->command = 0;
1237 break;
1238 }
1239 ptr->v_next = NULL;
1240 ptr->b_next = I596_NULL;
1241 DMA_WBACK(dev, ptr, sizeof(struct i596_cmd));
1242 lp->last_cmd = jiffies;
1243 }
1244
1245 /* This mess is arranging that only the last of any outstanding
1246 * commands has the interrupt bit set. Should probably really
1247 * only add to the cmd queue when the CU is stopped.
1248 */
1249 ptr = lp->cmd_head;
1250 while ((ptr != NULL) && (ptr != lp->cmd_tail)) {
1251 struct i596_cmd *prev = ptr;
1252
1253 ptr->command &= SWAP16(0x1fff);
1254 ptr = ptr->v_next;
1255 DMA_WBACK_INV(dev, prev, sizeof(struct i596_cmd));
1256 }
1257
1258 if (lp->cmd_head != NULL)
1259 ack_cmd |= CUC_START;
1260 dma->scb.cmd = SWAP32(virt_to_dma(lp, &lp->cmd_head->status));
1261 DMA_WBACK_INV(dev, &dma->scb, sizeof(struct i596_scb));
1262 }
1263 if ((status & 0x1000) || (status & 0x4000)) {
1264 if ((status & 0x4000))
1265 DEB(DEB_INTS,
1266 printk(KERN_DEBUG
1267 "%s: i596 interrupt received a frame.\n",
1268 dev->name));
1269 i596_rx(dev);
1270 /* Only RX_START if stopped - RGH 07-07-96 */
1271 if (status & 0x1000) {
1272 if (netif_running(dev)) {
1273 DEB(DEB_ERRORS,
1274 printk(KERN_DEBUG
1275 "%s: i596 interrupt receive unit inactive, status 0x%x\n",
1276 dev->name, status));
1277 ack_cmd |= RX_START;
1278 dev->stats.rx_errors++;
1279 dev->stats.rx_fifo_errors++;
1280 rebuild_rx_bufs(dev);
1281 }
1282 }
1283 }
1284 wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1285 dma->scb.command = SWAP16(ack_cmd);
1286 DMA_WBACK(dev, &dma->scb, sizeof(struct i596_scb));
1287
1288 /* DANGER: I suspect that some kind of interrupt
1289 acknowledgement aside from acking the 82596 might be needed
1290 here... but it's running acceptably without */
1291
1292 ca(dev);
1293
1294 wait_cmd(dev, dma, 100, "i596 interrupt, exit timeout");
1295 DEB(DEB_INTS, printk(KERN_DEBUG "%s: exiting interrupt.\n", dev->name));
1296
1297 spin_unlock (&lp->lock);
1298 return IRQ_HANDLED;
1299 }
1300
1301 static int i596_close(struct net_device *dev)
1302 {
1303 struct i596_private *lp = netdev_priv(dev);
1304 unsigned long flags;
1305
1306 netif_stop_queue(dev);
1307
1308 DEB(DEB_INIT,
1309 printk(KERN_DEBUG
1310 "%s: Shutting down ethercard, status was %4.4x.\n",
1311 dev->name, SWAP16(lp->dma->scb.status)));
1312
1313 spin_lock_irqsave(&lp->lock, flags);
1314
1315 wait_cmd(dev, lp->dma, 100, "close1 timed out");
1316 lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
1317 DMA_WBACK(dev, &lp->dma->scb, sizeof(struct i596_scb));
1318
1319 ca(dev);
1320
1321 wait_cmd(dev, lp->dma, 100, "close2 timed out");
1322 spin_unlock_irqrestore(&lp->lock, flags);
1323 DEB(DEB_STRUCT, i596_display_data(dev));
1324 i596_cleanup_cmd(dev, lp);
1325
1326 free_irq(dev->irq, dev);
1327 remove_rx_bufs(dev);
1328
1329 return 0;
1330 }
1331
1332 /*
1333 * Set or clear the multicast filter for this adaptor.
1334 */
1335
1336 static void set_multicast_list(struct net_device *dev)
1337 {
1338 struct i596_private *lp = netdev_priv(dev);
1339 struct i596_dma *dma = lp->dma;
1340 int config = 0, cnt;
1341
1342 DEB(DEB_MULTI,
1343 printk(KERN_DEBUG
1344 "%s: set multicast list, %d entries, promisc %s, allmulti %s\n",
1345 dev->name, dev->mc_count,
1346 dev->flags & IFF_PROMISC ? "ON" : "OFF",
1347 dev->flags & IFF_ALLMULTI ? "ON" : "OFF"));
1348
1349 if ((dev->flags & IFF_PROMISC) &&
1350 !(dma->cf_cmd.i596_config[8] & 0x01)) {
1351 dma->cf_cmd.i596_config[8] |= 0x01;
1352 config = 1;
1353 }
1354 if (!(dev->flags & IFF_PROMISC) &&
1355 (dma->cf_cmd.i596_config[8] & 0x01)) {
1356 dma->cf_cmd.i596_config[8] &= ~0x01;
1357 config = 1;
1358 }
1359 if ((dev->flags & IFF_ALLMULTI) &&
1360 (dma->cf_cmd.i596_config[11] & 0x20)) {
1361 dma->cf_cmd.i596_config[11] &= ~0x20;
1362 config = 1;
1363 }
1364 if (!(dev->flags & IFF_ALLMULTI) &&
1365 !(dma->cf_cmd.i596_config[11] & 0x20)) {
1366 dma->cf_cmd.i596_config[11] |= 0x20;
1367 config = 1;
1368 }
1369 if (config) {
1370 if (dma->cf_cmd.cmd.command)
1371 printk(KERN_INFO
1372 "%s: config change request already queued\n",
1373 dev->name);
1374 else {
1375 dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
1376 DMA_WBACK_INV(dev, &dma->cf_cmd, sizeof(struct cf_cmd));
1377 i596_add_cmd(dev, &dma->cf_cmd.cmd);
1378 }
1379 }
1380
1381 cnt = dev->mc_count;
1382 if (cnt > MAX_MC_CNT) {
1383 cnt = MAX_MC_CNT;
1384 printk(KERN_NOTICE "%s: Only %d multicast addresses supported",
1385 dev->name, cnt);
1386 }
1387
1388 if (dev->mc_count > 0) {
1389 struct dev_mc_list *dmi;
1390 unsigned char *cp;
1391 struct mc_cmd *cmd;
1392
1393 cmd = &dma->mc_cmd;
1394 cmd->cmd.command = SWAP16(CmdMulticastList);
1395 cmd->mc_cnt = SWAP16(dev->mc_count * 6);
1396 cp = cmd->mc_addrs;
1397 for (dmi = dev->mc_list;
1398 cnt && dmi != NULL;
1399 dmi = dmi->next, cnt--, cp += 6) {
1400 memcpy(cp, dmi->dmi_addr, 6);
1401 if (i596_debug > 1)
1402 DEB(DEB_MULTI,
1403 printk(KERN_DEBUG
1404 "%s: Adding address %pM\n",
1405 dev->name, cp));
1406 }
1407 DMA_WBACK_INV(dev, &dma->mc_cmd, sizeof(struct mc_cmd));
1408 i596_add_cmd(dev, &cmd->cmd);
1409 }
1410 }
Support for the Chinese Samsung S3C2440 based development boards