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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
124static 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 */
129static 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
144enum 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
166struct 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
175struct 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
193struct 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
200struct 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
214struct tdr_cmd {
215 struct i596_cmd cmd;
216 unsigned short status;
217 unsigned short pad;
218};
219
220struct mc_cmd {
221 struct i596_cmd cmd;
222 short mc_cnt;
223 char mc_addrs[MAX_MC_CNT*6];
224};
225
226struct sa_cmd {
227 struct i596_cmd cmd;
228 char eth_addr[8];
229};
230
231struct cf_cmd {
232 struct i596_cmd cmd;
233 char i596_config[16];
234};
235
236struct 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
250struct 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
274struct 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
289struct i596_iscp {
290 u32 stat;
291 u32 scb;
292};
293
294struct i596_scp {
295 u32 sysbus;
296 u32 pad;
297 u32 iscp;
298};
299
300struct 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
314struct 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
332static 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
349static int i596_open(struct net_device *dev);
350static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev);
351static irqreturn_t i596_interrupt(int irq, void *dev_id);
352static int i596_close(struct net_device *dev);
353static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd);
354static void i596_tx_timeout (struct net_device *dev);
355static void print_eth(unsigned char *buf, char *str);
356static void set_multicast_list(struct net_device *dev);
357static inline void ca(struct net_device *dev);
358static void mpu_port(struct net_device *dev, int c, dma_addr_t x);
359
360static int rx_ring_size = RX_RING_SIZE;
361static int ticks_limit = 100;
362static int max_cmd_backlog = TX_RING_SIZE-1;
363
364#ifdef CONFIG_NET_POLL_CONTROLLER
365static void i596_poll_controller(struct net_device *dev);
366#endif
367
368
369static 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
385static 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
403static 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
460static 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
515static 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
532static 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
554static 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
639failed_free_irq:
640 free_irq(dev->irq, dev);
641failed:
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
648static 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 }
720memory_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 memcpy(skb_put(skb, pkt_len), rbd->v_data, pkt_len);
731 dma_sync_single_for_device(dev->dev.parent,
732 (dma_addr_t)SWAP32(rbd->b_data),
733 PKT_BUF_SZ, DMA_FROM_DEVICE);
734 }
735 skb->len = pkt_len;
736 skb->protocol = eth_type_trans(skb, dev);
737 netif_rx(skb);
738 dev->stats.rx_packets++;
739 dev->stats.rx_bytes += pkt_len;
740 }
741 } else {
742 DEB(DEB_ERRORS, printk(KERN_DEBUG
743 "%s: Error, rfd.stat = 0x%04x\n",
744 dev->name, rfd->stat));
745 dev->stats.rx_errors++;
746 if (rfd->stat & SWAP16(0x0100))
747 dev->stats.collisions++;
748 if (rfd->stat & SWAP16(0x8000))
749 dev->stats.rx_length_errors++;
750 if (rfd->stat & SWAP16(0x0001))
751 dev->stats.rx_over_errors++;
752 if (rfd->stat & SWAP16(0x0002))
753 dev->stats.rx_fifo_errors++;
754 if (rfd->stat & SWAP16(0x0004))
755 dev->stats.rx_frame_errors++;
756 if (rfd->stat & SWAP16(0x0008))
757 dev->stats.rx_crc_errors++;
758 if (rfd->stat & SWAP16(0x0010))
759 dev->stats.rx_length_errors++;
760 }
761
762 /* Clear the buffer descriptor count and EOF + F flags */
763
764 if (rbd != NULL && (rbd->count & SWAP16(0x4000))) {
765 rbd->count = 0;
766 lp->rbd_head = rbd->v_next;
767 DMA_WBACK_INV(dev, rbd, sizeof(struct i596_rbd));
768 }
769
770 /* Tidy the frame descriptor, marking it as end of list */
771
772 rfd->rbd = I596_NULL;
773 rfd->stat = 0;
774 rfd->cmd = SWAP16(CMD_EOL|CMD_FLEX);
775 rfd->count = 0;
776
777 /* Update record of next frame descriptor to process */
778
779 lp->dma->scb.rfd = rfd->b_next;
780 lp->rfd_head = rfd->v_next;
781 DMA_WBACK_INV(dev, rfd, sizeof(struct i596_rfd));
782
783 /* Remove end-of-list from old end descriptor */
784
785 rfd->v_prev->cmd = SWAP16(CMD_FLEX);
786 DMA_WBACK_INV(dev, rfd->v_prev, sizeof(struct i596_rfd));
787 rfd = lp->rfd_head;
788 DMA_INV(dev, rfd, sizeof(struct i596_rfd));
789 }
790
791 DEB(DEB_RXFRAME, printk(KERN_DEBUG "frames %d\n", frames));
792
793 return 0;
794}
795
796
797static inline void i596_cleanup_cmd(struct net_device *dev, struct i596_private *lp)
798{
799 struct i596_cmd *ptr;
800
801 while (lp->cmd_head != NULL) {
802 ptr = lp->cmd_head;
803 lp->cmd_head = ptr->v_next;
804 lp->cmd_backlog--;
805
806 switch (SWAP16(ptr->command) & 0x7) {
807 case CmdTx:
808 {
809 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
810 struct sk_buff *skb = tx_cmd->skb;
811 dma_unmap_single(dev->dev.parent,
812 tx_cmd->dma_addr,
813 skb->len, DMA_TO_DEVICE);
814
815 dev_kfree_skb(skb);
816
817 dev->stats.tx_errors++;
818 dev->stats.tx_aborted_errors++;
819
820 ptr->v_next = NULL;
821 ptr->b_next = I596_NULL;
822 tx_cmd->cmd.command = 0; /* Mark as free */
823 break;
824 }
825 default:
826 ptr->v_next = NULL;
827 ptr->b_next = I596_NULL;
828 }
829 DMA_WBACK_INV(dev, ptr, sizeof(struct i596_cmd));
830 }
831
832 wait_cmd(dev, lp->dma, 100, "i596_cleanup_cmd timed out");
833 lp->dma->scb.cmd = I596_NULL;
834 DMA_WBACK(dev, &(lp->dma->scb), sizeof(struct i596_scb));
835}
836
837
838static inline void i596_reset(struct net_device *dev, struct i596_private *lp)
839{
840 unsigned long flags;
841
842 DEB(DEB_RESET, printk(KERN_DEBUG "i596_reset\n"));
843
844 spin_lock_irqsave (&lp->lock, flags);
845
846 wait_cmd(dev, lp->dma, 100, "i596_reset timed out");
847
848 netif_stop_queue(dev);
849
850 /* FIXME: this command might cause an lpmc */
851 lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
852 DMA_WBACK(dev, &(lp->dma->scb), sizeof(struct i596_scb));
853 ca(dev);
854
855 /* wait for shutdown */
856 wait_cmd(dev, lp->dma, 1000, "i596_reset 2 timed out");
857 spin_unlock_irqrestore (&lp->lock, flags);
858
859 i596_cleanup_cmd(dev, lp);
860 i596_rx(dev);
861
862 netif_start_queue(dev);
863 init_i596_mem(dev);
864}
865
866
867static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd)
868{
869 struct i596_private *lp = netdev_priv(dev);
870 struct i596_dma *dma = lp->dma;
871 unsigned long flags;
872
873 DEB(DEB_ADDCMD, printk(KERN_DEBUG "i596_add_cmd cmd_head %p\n",
874 lp->cmd_head));
875
876 cmd->status = 0;
877 cmd->command |= SWAP16(CMD_EOL | CMD_INTR);
878 cmd->v_next = NULL;
879 cmd->b_next = I596_NULL;
880 DMA_WBACK(dev, cmd, sizeof(struct i596_cmd));
881
882 spin_lock_irqsave (&lp->lock, flags);
883
884 if (lp->cmd_head != NULL) {
885 lp->cmd_tail->v_next = cmd;
886 lp->cmd_tail->b_next = SWAP32(virt_to_dma(lp, &cmd->status));
887 DMA_WBACK(dev, lp->cmd_tail, sizeof(struct i596_cmd));
888 } else {
889 lp->cmd_head = cmd;
890 wait_cmd(dev, dma, 100, "i596_add_cmd timed out");
891 dma->scb.cmd = SWAP32(virt_to_dma(lp, &cmd->status));
892 dma->scb.command = SWAP16(CUC_START);
893 DMA_WBACK(dev, &(dma->scb), sizeof(struct i596_scb));
894 ca(dev);
895 }
896 lp->cmd_tail = cmd;
897 lp->cmd_backlog++;
898
899 spin_unlock_irqrestore (&lp->lock, flags);
900
901 if (lp->cmd_backlog > max_cmd_backlog) {
902 unsigned long tickssofar = jiffies - lp->last_cmd;
903
904 if (tickssofar < ticks_limit)
905 return;
906
907 printk(KERN_ERR
908 "%s: command unit timed out, status resetting.\n",
909 dev->name);
910#if 1
911 i596_reset(dev, lp);
912#endif
913 }
914}
915
916static int i596_open(struct net_device *dev)
917{
918 DEB(DEB_OPEN, printk(KERN_DEBUG
919 "%s: i596_open() irq %d.\n", dev->name, dev->irq));
920
921 if (init_rx_bufs(dev)) {
922 printk(KERN_ERR "%s: Failed to init rx bufs\n", dev->name);
923 return -EAGAIN;
924 }
925 if (init_i596_mem(dev)) {
926 printk(KERN_ERR "%s: Failed to init memory\n", dev->name);
927 goto out_remove_rx_bufs;
928 }
929 netif_start_queue(dev);
930
931 return 0;
932
933out_remove_rx_bufs:
934 remove_rx_bufs(dev);
935 return -EAGAIN;
936}
937
938static void i596_tx_timeout (struct net_device *dev)
939{
940 struct i596_private *lp = netdev_priv(dev);
941
942 /* Transmitter timeout, serious problems. */
943 DEB(DEB_ERRORS, printk(KERN_DEBUG
944 "%s: transmit timed out, status resetting.\n",
945 dev->name));
946
947 dev->stats.tx_errors++;
948
949 /* Try to restart the adaptor */
950 if (lp->last_restart == dev->stats.tx_packets) {
951 DEB(DEB_ERRORS, printk(KERN_DEBUG "Resetting board.\n"));
952 /* Shutdown and restart */
953 i596_reset (dev, lp);
954 } else {
955 /* Issue a channel attention signal */
956 DEB(DEB_ERRORS, printk(KERN_DEBUG "Kicking board.\n"));
957 lp->dma->scb.command = SWAP16(CUC_START | RX_START);
958 DMA_WBACK_INV(dev, &(lp->dma->scb), sizeof(struct i596_scb));
959 ca (dev);
960 lp->last_restart = dev->stats.tx_packets;
961 }
962
963 dev->trans_start = jiffies; /* prevent tx timeout */
964 netif_wake_queue (dev);
965}
966
967
968static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev)
969{
970 struct i596_private *lp = netdev_priv(dev);
971 struct tx_cmd *tx_cmd;
972 struct i596_tbd *tbd;
973 short length = skb->len;
974
975 DEB(DEB_STARTTX, printk(KERN_DEBUG
976 "%s: i596_start_xmit(%x,%p) called\n",
977 dev->name, skb->len, skb->data));
978
979 if (length < ETH_ZLEN) {
980 if (skb_padto(skb, ETH_ZLEN))
981 return NETDEV_TX_OK;
982 length = ETH_ZLEN;
983 }
984
985 netif_stop_queue(dev);
986
987 tx_cmd = lp->dma->tx_cmds + lp->next_tx_cmd;
988 tbd = lp->dma->tbds + lp->next_tx_cmd;
989
990 if (tx_cmd->cmd.command) {
991 DEB(DEB_ERRORS, printk(KERN_DEBUG
992 "%s: xmit ring full, dropping packet.\n",
993 dev->name));
994 dev->stats.tx_dropped++;
995
996 dev_kfree_skb_any(skb);
997 } else {
998 if (++lp->next_tx_cmd == TX_RING_SIZE)
999 lp->next_tx_cmd = 0;
1000 tx_cmd->tbd = SWAP32(virt_to_dma(lp, tbd));
1001 tbd->next = I596_NULL;
1002
1003 tx_cmd->cmd.command = SWAP16(CMD_FLEX | CmdTx);
1004 tx_cmd->skb = skb;
1005
1006 tx_cmd->pad = 0;
1007 tx_cmd->size = 0;
1008 tbd->pad = 0;
1009 tbd->size = SWAP16(EOF | length);
1010
1011 tx_cmd->dma_addr = dma_map_single(dev->dev.parent, skb->data,
1012 skb->len, DMA_TO_DEVICE);
1013 tbd->data = SWAP32(tx_cmd->dma_addr);
1014
1015 DEB(DEB_TXADDR, print_eth(skb->data, "tx-queued"));
1016 DMA_WBACK_INV(dev, tx_cmd, sizeof(struct tx_cmd));
1017 DMA_WBACK_INV(dev, tbd, sizeof(struct i596_tbd));
1018 i596_add_cmd(dev, &tx_cmd->cmd);
1019
1020 dev->stats.tx_packets++;
1021 dev->stats.tx_bytes += length;
1022 }
1023
1024 netif_start_queue(dev);
1025
1026 return NETDEV_TX_OK;
1027}
1028
1029static void print_eth(unsigned char *add, char *str)
1030{
1031 printk(KERN_DEBUG "i596 0x%p, %pM --> %pM %02X%02X, %s\n",
1032 add, add + 6, add, add[12], add[13], str);
1033}
1034static const struct net_device_ops i596_netdev_ops = {
1035 .ndo_open = i596_open,
1036 .ndo_stop = i596_close,
1037 .ndo_start_xmit = i596_start_xmit,
1038 .ndo_set_rx_mode = set_multicast_list,
1039 .ndo_tx_timeout = i596_tx_timeout,
1040 .ndo_change_mtu = eth_change_mtu,
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
1048static 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 = (struct i596_dma *) DMA_ALLOC(dev->dev.parent,
1067 sizeof(struct i596_dma), &lp->dma_addr, GFP_KERNEL);
1068 if (!dma) {
1069 printk(KERN_ERR "%s: Couldn't get shared memory\n", __FILE__);
1070 return -ENOMEM;
1071 }
1072
1073 dev->netdev_ops = &i596_netdev_ops;
1074 dev->watchdog_timeo = TX_TIMEOUT;
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, %pM IRQ %d.\n",
1094 dev->name, dev->base_addr, dev->dev_addr,
1095 dev->irq));
1096 DEB(DEB_INIT, printk(KERN_INFO
1097 "%s: dma at 0x%p (%d bytes), lp->scb at 0x%p\n",
1098 dev->name, dma, (int)sizeof(struct i596_dma),
1099 &dma->scb));
1100
1101 return 0;
1102}
1103
1104#ifdef CONFIG_NET_POLL_CONTROLLER
1105static void i596_poll_controller(struct net_device *dev)
1106{
1107 disable_irq(dev->irq);
1108 i596_interrupt(dev->irq, dev);
1109 enable_irq(dev->irq);
1110}
1111#endif
1112
1113static irqreturn_t i596_interrupt(int irq, void *dev_id)
1114{
1115 struct net_device *dev = dev_id;
1116 struct i596_private *lp;
1117 struct i596_dma *dma;
1118 unsigned short status, ack_cmd = 0;
1119
1120 lp = netdev_priv(dev);
1121 dma = lp->dma;
1122
1123 spin_lock (&lp->lock);
1124
1125 wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1126 status = SWAP16(dma->scb.status);
1127
1128 DEB(DEB_INTS, printk(KERN_DEBUG
1129 "%s: i596 interrupt, IRQ %d, status %4.4x.\n",
1130 dev->name, dev->irq, status));
1131
1132 ack_cmd = status & 0xf000;
1133
1134 if (!ack_cmd) {
1135 DEB(DEB_ERRORS, printk(KERN_DEBUG
1136 "%s: interrupt with no events\n",
1137 dev->name));
1138 spin_unlock (&lp->lock);
1139 return IRQ_NONE;
1140 }
1141
1142 if ((status & 0x8000) || (status & 0x2000)) {
1143 struct i596_cmd *ptr;
1144
1145 if ((status & 0x8000))
1146 DEB(DEB_INTS,
1147 printk(KERN_DEBUG
1148 "%s: i596 interrupt completed command.\n",
1149 dev->name));
1150 if ((status & 0x2000))
1151 DEB(DEB_INTS,
1152 printk(KERN_DEBUG
1153 "%s: i596 interrupt command unit inactive %x.\n",
1154 dev->name, status & 0x0700));
1155
1156 while (lp->cmd_head != NULL) {
1157 DMA_INV(dev, lp->cmd_head, sizeof(struct i596_cmd));
1158 if (!(lp->cmd_head->status & SWAP16(STAT_C)))
1159 break;
1160
1161 ptr = lp->cmd_head;
1162
1163 DEB(DEB_STATUS,
1164 printk(KERN_DEBUG
1165 "cmd_head->status = %04x, ->command = %04x\n",
1166 SWAP16(lp->cmd_head->status),
1167 SWAP16(lp->cmd_head->command)));
1168 lp->cmd_head = ptr->v_next;
1169 lp->cmd_backlog--;
1170
1171 switch (SWAP16(ptr->command) & 0x7) {
1172 case CmdTx:
1173 {
1174 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
1175 struct sk_buff *skb = tx_cmd->skb;
1176
1177 if (ptr->status & SWAP16(STAT_OK)) {
1178 DEB(DEB_TXADDR,
1179 print_eth(skb->data, "tx-done"));
1180 } else {
1181 dev->stats.tx_errors++;
1182 if (ptr->status & SWAP16(0x0020))
1183 dev->stats.collisions++;
1184 if (!(ptr->status & SWAP16(0x0040)))
1185 dev->stats.tx_heartbeat_errors++;
1186 if (ptr->status & SWAP16(0x0400))
1187 dev->stats.tx_carrier_errors++;
1188 if (ptr->status & SWAP16(0x0800))
1189 dev->stats.collisions++;
1190 if (ptr->status & SWAP16(0x1000))
1191 dev->stats.tx_aborted_errors++;
1192 }
1193 dma_unmap_single(dev->dev.parent,
1194 tx_cmd->dma_addr,
1195 skb->len, DMA_TO_DEVICE);
1196 dev_kfree_skb_irq(skb);
1197
1198 tx_cmd->cmd.command = 0; /* Mark free */
1199 break;
1200 }
1201 case CmdTDR:
1202 {
1203 unsigned short status = SWAP16(((struct tdr_cmd *)ptr)->status);
1204
1205 if (status & 0x8000) {
1206 DEB(DEB_ANY,
1207 printk(KERN_DEBUG "%s: link ok.\n",
1208 dev->name));
1209 } else {
1210 if (status & 0x4000)
1211 printk(KERN_ERR
1212 "%s: Transceiver problem.\n",
1213 dev->name);
1214 if (status & 0x2000)
1215 printk(KERN_ERR
1216 "%s: Termination problem.\n",
1217 dev->name);
1218 if (status & 0x1000)
1219 printk(KERN_ERR
1220 "%s: Short circuit.\n",
1221 dev->name);
1222
1223 DEB(DEB_TDR,
1224 printk(KERN_DEBUG "%s: Time %d.\n",
1225 dev->name, status & 0x07ff));
1226 }
1227 break;
1228 }
1229 case CmdConfigure:
1230 /*
1231 * Zap command so set_multicast_list() know
1232 * it is free
1233 */
1234 ptr->command = 0;
1235 break;
1236 }
1237 ptr->v_next = NULL;
1238 ptr->b_next = I596_NULL;
1239 DMA_WBACK(dev, ptr, sizeof(struct i596_cmd));
1240 lp->last_cmd = jiffies;
1241 }
1242
1243 /* This mess is arranging that only the last of any outstanding
1244 * commands has the interrupt bit set. Should probably really
1245 * only add to the cmd queue when the CU is stopped.
1246 */
1247 ptr = lp->cmd_head;
1248 while ((ptr != NULL) && (ptr != lp->cmd_tail)) {
1249 struct i596_cmd *prev = ptr;
1250
1251 ptr->command &= SWAP16(0x1fff);
1252 ptr = ptr->v_next;
1253 DMA_WBACK_INV(dev, prev, sizeof(struct i596_cmd));
1254 }
1255
1256 if (lp->cmd_head != NULL)
1257 ack_cmd |= CUC_START;
1258 dma->scb.cmd = SWAP32(virt_to_dma(lp, &lp->cmd_head->status));
1259 DMA_WBACK_INV(dev, &dma->scb, sizeof(struct i596_scb));
1260 }
1261 if ((status & 0x1000) || (status & 0x4000)) {
1262 if ((status & 0x4000))
1263 DEB(DEB_INTS,
1264 printk(KERN_DEBUG
1265 "%s: i596 interrupt received a frame.\n",
1266 dev->name));
1267 i596_rx(dev);
1268 /* Only RX_START if stopped - RGH 07-07-96 */
1269 if (status & 0x1000) {
1270 if (netif_running(dev)) {
1271 DEB(DEB_ERRORS,
1272 printk(KERN_DEBUG
1273 "%s: i596 interrupt receive unit inactive, status 0x%x\n",
1274 dev->name, status));
1275 ack_cmd |= RX_START;
1276 dev->stats.rx_errors++;
1277 dev->stats.rx_fifo_errors++;
1278 rebuild_rx_bufs(dev);
1279 }
1280 }
1281 }
1282 wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1283 dma->scb.command = SWAP16(ack_cmd);
1284 DMA_WBACK(dev, &dma->scb, sizeof(struct i596_scb));
1285
1286 /* DANGER: I suspect that some kind of interrupt
1287 acknowledgement aside from acking the 82596 might be needed
1288 here... but it's running acceptably without */
1289
1290 ca(dev);
1291
1292 wait_cmd(dev, dma, 100, "i596 interrupt, exit timeout");
1293 DEB(DEB_INTS, printk(KERN_DEBUG "%s: exiting interrupt.\n", dev->name));
1294
1295 spin_unlock (&lp->lock);
1296 return IRQ_HANDLED;
1297}
1298
1299static int i596_close(struct net_device *dev)
1300{
1301 struct i596_private *lp = netdev_priv(dev);
1302 unsigned long flags;
1303
1304 netif_stop_queue(dev);
1305
1306 DEB(DEB_INIT,
1307 printk(KERN_DEBUG
1308 "%s: Shutting down ethercard, status was %4.4x.\n",
1309 dev->name, SWAP16(lp->dma->scb.status)));
1310
1311 spin_lock_irqsave(&lp->lock, flags);
1312
1313 wait_cmd(dev, lp->dma, 100, "close1 timed out");
1314 lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
1315 DMA_WBACK(dev, &lp->dma->scb, sizeof(struct i596_scb));
1316
1317 ca(dev);
1318
1319 wait_cmd(dev, lp->dma, 100, "close2 timed out");
1320 spin_unlock_irqrestore(&lp->lock, flags);
1321 DEB(DEB_STRUCT, i596_display_data(dev));
1322 i596_cleanup_cmd(dev, lp);
1323
1324 free_irq(dev->irq, dev);
1325 remove_rx_bufs(dev);
1326
1327 return 0;
1328}
1329
1330/*
1331 * Set or clear the multicast filter for this adaptor.
1332 */
1333
1334static void set_multicast_list(struct net_device *dev)
1335{
1336 struct i596_private *lp = netdev_priv(dev);
1337 struct i596_dma *dma = lp->dma;
1338 int config = 0, cnt;
1339
1340 DEB(DEB_MULTI,
1341 printk(KERN_DEBUG
1342 "%s: set multicast list, %d entries, promisc %s, allmulti %s\n",
1343 dev->name, netdev_mc_count(dev),
1344 dev->flags & IFF_PROMISC ? "ON" : "OFF",
1345 dev->flags & IFF_ALLMULTI ? "ON" : "OFF"));
1346
1347 if ((dev->flags & IFF_PROMISC) &&
1348 !(dma->cf_cmd.i596_config[8] & 0x01)) {
1349 dma->cf_cmd.i596_config[8] |= 0x01;
1350 config = 1;
1351 }
1352 if (!(dev->flags & IFF_PROMISC) &&
1353 (dma->cf_cmd.i596_config[8] & 0x01)) {
1354 dma->cf_cmd.i596_config[8] &= ~0x01;
1355 config = 1;
1356 }
1357 if ((dev->flags & IFF_ALLMULTI) &&
1358 (dma->cf_cmd.i596_config[11] & 0x20)) {
1359 dma->cf_cmd.i596_config[11] &= ~0x20;
1360 config = 1;
1361 }
1362 if (!(dev->flags & IFF_ALLMULTI) &&
1363 !(dma->cf_cmd.i596_config[11] & 0x20)) {
1364 dma->cf_cmd.i596_config[11] |= 0x20;
1365 config = 1;
1366 }
1367 if (config) {
1368 if (dma->cf_cmd.cmd.command)
1369 printk(KERN_INFO
1370 "%s: config change request already queued\n",
1371 dev->name);
1372 else {
1373 dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
1374 DMA_WBACK_INV(dev, &dma->cf_cmd, sizeof(struct cf_cmd));
1375 i596_add_cmd(dev, &dma->cf_cmd.cmd);
1376 }
1377 }
1378
1379 cnt = netdev_mc_count(dev);
1380 if (cnt > MAX_MC_CNT) {
1381 cnt = MAX_MC_CNT;
1382 printk(KERN_NOTICE "%s: Only %d multicast addresses supported",
1383 dev->name, cnt);
1384 }
1385
1386 if (!netdev_mc_empty(dev)) {
1387 struct netdev_hw_addr *ha;
1388 unsigned char *cp;
1389 struct mc_cmd *cmd;
1390
1391 cmd = &dma->mc_cmd;
1392 cmd->cmd.command = SWAP16(CmdMulticastList);
1393 cmd->mc_cnt = SWAP16(netdev_mc_count(dev) * 6);
1394 cp = cmd->mc_addrs;
1395 netdev_for_each_mc_addr(ha, dev) {
1396 if (!cnt--)
1397 break;
1398 memcpy(cp, ha->addr, ETH_ALEN);
1399 if (i596_debug > 1)
1400 DEB(DEB_MULTI,
1401 printk(KERN_DEBUG
1402 "%s: Adding address %pM\n",
1403 dev->name, cp));
1404 cp += ETH_ALEN;
1405 }
1406 DMA_WBACK_INV(dev, &dma->mc_cmd, sizeof(struct mc_cmd));
1407 i596_add_cmd(dev, &cmd->cmd);
1408 }
1409}
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
124static 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 */
129static 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
144enum 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
166struct 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
175struct 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
193struct 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
200struct 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
214struct tdr_cmd {
215 struct i596_cmd cmd;
216 unsigned short status;
217 unsigned short pad;
218};
219
220struct mc_cmd {
221 struct i596_cmd cmd;
222 short mc_cnt;
223 char mc_addrs[MAX_MC_CNT*6];
224};
225
226struct sa_cmd {
227 struct i596_cmd cmd;
228 char eth_addr[8];
229};
230
231struct cf_cmd {
232 struct i596_cmd cmd;
233 char i596_config[16];
234};
235
236struct 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
250struct 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
274struct 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
289struct i596_iscp {
290 u32 stat;
291 u32 scb;
292};
293
294struct i596_scp {
295 u32 sysbus;
296 u32 pad;
297 u32 iscp;
298};
299
300struct 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
314struct 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
332static 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
349static int i596_open(struct net_device *dev);
350static netdev_tx_t i596_start_xmit(struct sk_buff *skb, struct net_device *dev);
351static irqreturn_t i596_interrupt(int irq, void *dev_id);
352static int i596_close(struct net_device *dev);
353static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd);
354static void i596_tx_timeout (struct net_device *dev, unsigned int txqueue);
355static void print_eth(unsigned char *buf, char *str);
356static void set_multicast_list(struct net_device *dev);
357static inline void ca(struct net_device *dev);
358static void mpu_port(struct net_device *dev, int c, dma_addr_t x);
359
360static int rx_ring_size = RX_RING_SIZE;
361static int ticks_limit = 100;
362static int max_cmd_backlog = TX_RING_SIZE-1;
363
364#ifdef CONFIG_NET_POLL_CONTROLLER
365static void i596_poll_controller(struct net_device *dev);
366#endif
367
368static inline dma_addr_t virt_to_dma(struct i596_private *lp, volatile void *v)
369{
370 return lp->dma_addr + ((unsigned long)v - (unsigned long)lp->dma);
371}
372
373#ifdef NONCOHERENT_DMA
374static inline void dma_sync_dev(struct net_device *ndev, volatile void *addr,
375 size_t len)
376{
377 dma_sync_single_for_device(ndev->dev.parent,
378 virt_to_dma(netdev_priv(ndev), addr), len,
379 DMA_BIDIRECTIONAL);
380}
381
382static inline void dma_sync_cpu(struct net_device *ndev, volatile void *addr,
383 size_t len)
384{
385 dma_sync_single_for_cpu(ndev->dev.parent,
386 virt_to_dma(netdev_priv(ndev), addr), len,
387 DMA_BIDIRECTIONAL);
388}
389#else
390static inline void dma_sync_dev(struct net_device *ndev, volatile void *addr,
391 size_t len)
392{
393}
394static inline void dma_sync_cpu(struct net_device *ndev, volatile void *addr,
395 size_t len)
396{
397}
398#endif /* NONCOHERENT_DMA */
399
400static inline int wait_istat(struct net_device *dev, struct i596_dma *dma, int delcnt, char *str)
401{
402 dma_sync_cpu(dev, &(dma->iscp), sizeof(struct i596_iscp));
403 while (--delcnt && dma->iscp.stat) {
404 udelay(10);
405 dma_sync_cpu(dev, &(dma->iscp), sizeof(struct i596_iscp));
406 }
407 if (!delcnt) {
408 printk(KERN_ERR "%s: %s, iscp.stat %04x, didn't clear\n",
409 dev->name, str, SWAP16(dma->iscp.stat));
410 return -1;
411 } else
412 return 0;
413}
414
415
416static inline int wait_cmd(struct net_device *dev, struct i596_dma *dma, int delcnt, char *str)
417{
418 dma_sync_cpu(dev, &(dma->scb), sizeof(struct i596_scb));
419 while (--delcnt && dma->scb.command) {
420 udelay(10);
421 dma_sync_cpu(dev, &(dma->scb), sizeof(struct i596_scb));
422 }
423 if (!delcnt) {
424 printk(KERN_ERR "%s: %s, status %4.4x, cmd %4.4x.\n",
425 dev->name, str,
426 SWAP16(dma->scb.status),
427 SWAP16(dma->scb.command));
428 return -1;
429 } else
430 return 0;
431}
432
433
434static void i596_display_data(struct net_device *dev)
435{
436 struct i596_private *lp = netdev_priv(dev);
437 struct i596_dma *dma = lp->dma;
438 struct i596_cmd *cmd;
439 struct i596_rfd *rfd;
440 struct i596_rbd *rbd;
441
442 printk(KERN_DEBUG "lp and scp at %p, .sysbus = %08x, .iscp = %08x\n",
443 &dma->scp, dma->scp.sysbus, SWAP32(dma->scp.iscp));
444 printk(KERN_DEBUG "iscp at %p, iscp.stat = %08x, .scb = %08x\n",
445 &dma->iscp, SWAP32(dma->iscp.stat), SWAP32(dma->iscp.scb));
446 printk(KERN_DEBUG "scb at %p, scb.status = %04x, .command = %04x,"
447 " .cmd = %08x, .rfd = %08x\n",
448 &dma->scb, SWAP16(dma->scb.status), SWAP16(dma->scb.command),
449 SWAP16(dma->scb.cmd), SWAP32(dma->scb.rfd));
450 printk(KERN_DEBUG " errors: crc %x, align %x, resource %x,"
451 " over %x, rcvdt %x, short %x\n",
452 SWAP32(dma->scb.crc_err), SWAP32(dma->scb.align_err),
453 SWAP32(dma->scb.resource_err), SWAP32(dma->scb.over_err),
454 SWAP32(dma->scb.rcvdt_err), SWAP32(dma->scb.short_err));
455 cmd = lp->cmd_head;
456 while (cmd != NULL) {
457 printk(KERN_DEBUG
458 "cmd at %p, .status = %04x, .command = %04x,"
459 " .b_next = %08x\n",
460 cmd, SWAP16(cmd->status), SWAP16(cmd->command),
461 SWAP32(cmd->b_next));
462 cmd = cmd->v_next;
463 }
464 rfd = lp->rfd_head;
465 printk(KERN_DEBUG "rfd_head = %p\n", rfd);
466 do {
467 printk(KERN_DEBUG
468 " %p .stat %04x, .cmd %04x, b_next %08x, rbd %08x,"
469 " count %04x\n",
470 rfd, SWAP16(rfd->stat), SWAP16(rfd->cmd),
471 SWAP32(rfd->b_next), SWAP32(rfd->rbd),
472 SWAP16(rfd->count));
473 rfd = rfd->v_next;
474 } while (rfd != lp->rfd_head);
475 rbd = lp->rbd_head;
476 printk(KERN_DEBUG "rbd_head = %p\n", rbd);
477 do {
478 printk(KERN_DEBUG
479 " %p .count %04x, b_next %08x, b_data %08x,"
480 " size %04x\n",
481 rbd, SWAP16(rbd->count), SWAP32(rbd->b_next),
482 SWAP32(rbd->b_data), SWAP16(rbd->size));
483 rbd = rbd->v_next;
484 } while (rbd != lp->rbd_head);
485 dma_sync_cpu(dev, dma, sizeof(struct i596_dma));
486}
487
488static inline int init_rx_bufs(struct net_device *dev)
489{
490 struct i596_private *lp = netdev_priv(dev);
491 struct i596_dma *dma = lp->dma;
492 int i;
493 struct i596_rfd *rfd;
494 struct i596_rbd *rbd;
495
496 /* First build the Receive Buffer Descriptor List */
497
498 for (i = 0, rbd = dma->rbds; i < rx_ring_size; i++, rbd++) {
499 dma_addr_t dma_addr;
500 struct sk_buff *skb;
501
502 skb = netdev_alloc_skb_ip_align(dev, PKT_BUF_SZ);
503 if (skb == NULL)
504 return -1;
505 dma_addr = dma_map_single(dev->dev.parent, skb->data,
506 PKT_BUF_SZ, DMA_FROM_DEVICE);
507 rbd->v_next = rbd+1;
508 rbd->b_next = SWAP32(virt_to_dma(lp, rbd+1));
509 rbd->b_addr = SWAP32(virt_to_dma(lp, rbd));
510 rbd->skb = skb;
511 rbd->v_data = skb->data;
512 rbd->b_data = SWAP32(dma_addr);
513 rbd->size = SWAP16(PKT_BUF_SZ);
514 }
515 lp->rbd_head = dma->rbds;
516 rbd = dma->rbds + rx_ring_size - 1;
517 rbd->v_next = dma->rbds;
518 rbd->b_next = SWAP32(virt_to_dma(lp, dma->rbds));
519
520 /* Now build the Receive Frame Descriptor List */
521
522 for (i = 0, rfd = dma->rfds; i < rx_ring_size; i++, rfd++) {
523 rfd->rbd = I596_NULL;
524 rfd->v_next = rfd+1;
525 rfd->v_prev = rfd-1;
526 rfd->b_next = SWAP32(virt_to_dma(lp, rfd+1));
527 rfd->cmd = SWAP16(CMD_FLEX);
528 }
529 lp->rfd_head = dma->rfds;
530 dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
531 rfd = dma->rfds;
532 rfd->rbd = SWAP32(virt_to_dma(lp, lp->rbd_head));
533 rfd->v_prev = dma->rfds + rx_ring_size - 1;
534 rfd = dma->rfds + rx_ring_size - 1;
535 rfd->v_next = dma->rfds;
536 rfd->b_next = SWAP32(virt_to_dma(lp, dma->rfds));
537 rfd->cmd = SWAP16(CMD_EOL|CMD_FLEX);
538
539 dma_sync_dev(dev, dma, sizeof(struct i596_dma));
540 return 0;
541}
542
543static inline void remove_rx_bufs(struct net_device *dev)
544{
545 struct i596_private *lp = netdev_priv(dev);
546 struct i596_rbd *rbd;
547 int i;
548
549 for (i = 0, rbd = lp->dma->rbds; i < rx_ring_size; i++, rbd++) {
550 if (rbd->skb == NULL)
551 break;
552 dma_unmap_single(dev->dev.parent,
553 (dma_addr_t)SWAP32(rbd->b_data),
554 PKT_BUF_SZ, DMA_FROM_DEVICE);
555 dev_kfree_skb(rbd->skb);
556 }
557}
558
559
560static void rebuild_rx_bufs(struct net_device *dev)
561{
562 struct i596_private *lp = netdev_priv(dev);
563 struct i596_dma *dma = lp->dma;
564 int i;
565
566 /* Ensure rx frame/buffer descriptors are tidy */
567
568 for (i = 0; i < rx_ring_size; i++) {
569 dma->rfds[i].rbd = I596_NULL;
570 dma->rfds[i].cmd = SWAP16(CMD_FLEX);
571 }
572 dma->rfds[rx_ring_size-1].cmd = SWAP16(CMD_EOL|CMD_FLEX);
573 lp->rfd_head = dma->rfds;
574 dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
575 lp->rbd_head = dma->rbds;
576 dma->rfds[0].rbd = SWAP32(virt_to_dma(lp, dma->rbds));
577
578 dma_sync_dev(dev, dma, sizeof(struct i596_dma));
579}
580
581
582static int init_i596_mem(struct net_device *dev)
583{
584 struct i596_private *lp = netdev_priv(dev);
585 struct i596_dma *dma = lp->dma;
586 unsigned long flags;
587
588 mpu_port(dev, PORT_RESET, 0);
589 udelay(100); /* Wait 100us - seems to help */
590
591 /* change the scp address */
592
593 lp->last_cmd = jiffies;
594
595 dma->scp.sysbus = SYSBUS;
596 dma->scp.iscp = SWAP32(virt_to_dma(lp, &(dma->iscp)));
597 dma->iscp.scb = SWAP32(virt_to_dma(lp, &(dma->scb)));
598 dma->iscp.stat = SWAP32(ISCP_BUSY);
599 lp->cmd_backlog = 0;
600
601 lp->cmd_head = NULL;
602 dma->scb.cmd = I596_NULL;
603
604 DEB(DEB_INIT, printk(KERN_DEBUG "%s: starting i82596.\n", dev->name));
605
606 dma_sync_dev(dev, &(dma->scp), sizeof(struct i596_scp));
607 dma_sync_dev(dev, &(dma->iscp), sizeof(struct i596_iscp));
608 dma_sync_dev(dev, &(dma->scb), sizeof(struct i596_scb));
609
610 mpu_port(dev, PORT_ALTSCP, virt_to_dma(lp, &dma->scp));
611 ca(dev);
612 if (wait_istat(dev, dma, 1000, "initialization timed out"))
613 goto failed;
614 DEB(DEB_INIT, printk(KERN_DEBUG
615 "%s: i82596 initialization successful\n",
616 dev->name));
617
618 if (request_irq(dev->irq, i596_interrupt, 0, "i82596", dev)) {
619 printk(KERN_ERR "%s: IRQ %d not free\n", dev->name, dev->irq);
620 goto failed;
621 }
622
623 /* Ensure rx frame/buffer descriptors are tidy */
624 rebuild_rx_bufs(dev);
625
626 dma->scb.command = 0;
627 dma_sync_dev(dev, &(dma->scb), sizeof(struct i596_scb));
628
629 DEB(DEB_INIT, printk(KERN_DEBUG
630 "%s: queuing CmdConfigure\n", dev->name));
631 memcpy(dma->cf_cmd.i596_config, init_setup, 14);
632 dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
633 dma_sync_dev(dev, &(dma->cf_cmd), sizeof(struct cf_cmd));
634 i596_add_cmd(dev, &dma->cf_cmd.cmd);
635
636 DEB(DEB_INIT, printk(KERN_DEBUG "%s: queuing CmdSASetup\n", dev->name));
637 memcpy(dma->sa_cmd.eth_addr, dev->dev_addr, ETH_ALEN);
638 dma->sa_cmd.cmd.command = SWAP16(CmdSASetup);
639 dma_sync_dev(dev, &(dma->sa_cmd), sizeof(struct sa_cmd));
640 i596_add_cmd(dev, &dma->sa_cmd.cmd);
641
642 DEB(DEB_INIT, printk(KERN_DEBUG "%s: queuing CmdTDR\n", dev->name));
643 dma->tdr_cmd.cmd.command = SWAP16(CmdTDR);
644 dma_sync_dev(dev, &(dma->tdr_cmd), sizeof(struct tdr_cmd));
645 i596_add_cmd(dev, &dma->tdr_cmd.cmd);
646
647 spin_lock_irqsave (&lp->lock, flags);
648
649 if (wait_cmd(dev, dma, 1000, "timed out waiting to issue RX_START")) {
650 spin_unlock_irqrestore (&lp->lock, flags);
651 goto failed_free_irq;
652 }
653 DEB(DEB_INIT, printk(KERN_DEBUG "%s: Issuing RX_START\n", dev->name));
654 dma->scb.command = SWAP16(RX_START);
655 dma->scb.rfd = SWAP32(virt_to_dma(lp, dma->rfds));
656 dma_sync_dev(dev, &(dma->scb), sizeof(struct i596_scb));
657
658 ca(dev);
659
660 spin_unlock_irqrestore (&lp->lock, flags);
661 if (wait_cmd(dev, dma, 1000, "RX_START not processed"))
662 goto failed_free_irq;
663 DEB(DEB_INIT, printk(KERN_DEBUG
664 "%s: Receive unit started OK\n", dev->name));
665 return 0;
666
667failed_free_irq:
668 free_irq(dev->irq, dev);
669failed:
670 printk(KERN_ERR "%s: Failed to initialise 82596\n", dev->name);
671 mpu_port(dev, PORT_RESET, 0);
672 return -1;
673}
674
675
676static inline int i596_rx(struct net_device *dev)
677{
678 struct i596_private *lp = netdev_priv(dev);
679 struct i596_rfd *rfd;
680 struct i596_rbd *rbd;
681 int frames = 0;
682
683 DEB(DEB_RXFRAME, printk(KERN_DEBUG
684 "i596_rx(), rfd_head %p, rbd_head %p\n",
685 lp->rfd_head, lp->rbd_head));
686
687
688 rfd = lp->rfd_head; /* Ref next frame to check */
689
690 dma_sync_cpu(dev, rfd, sizeof(struct i596_rfd));
691 while (rfd->stat & SWAP16(STAT_C)) { /* Loop while complete frames */
692 if (rfd->rbd == I596_NULL)
693 rbd = NULL;
694 else if (rfd->rbd == lp->rbd_head->b_addr) {
695 rbd = lp->rbd_head;
696 dma_sync_cpu(dev, rbd, sizeof(struct i596_rbd));
697 } else {
698 printk(KERN_ERR "%s: rbd chain broken!\n", dev->name);
699 /* XXX Now what? */
700 rbd = NULL;
701 }
702 DEB(DEB_RXFRAME, printk(KERN_DEBUG
703 " rfd %p, rfd.rbd %08x, rfd.stat %04x\n",
704 rfd, rfd->rbd, rfd->stat));
705
706 if (rbd != NULL && (rfd->stat & SWAP16(STAT_OK))) {
707 /* a good frame */
708 int pkt_len = SWAP16(rbd->count) & 0x3fff;
709 struct sk_buff *skb = rbd->skb;
710 int rx_in_place = 0;
711
712 DEB(DEB_RXADDR, print_eth(rbd->v_data, "received"));
713 frames++;
714
715 /* Check if the packet is long enough to just accept
716 * without copying to a properly sized skbuff.
717 */
718
719 if (pkt_len > rx_copybreak) {
720 struct sk_buff *newskb;
721 dma_addr_t dma_addr;
722
723 dma_unmap_single(dev->dev.parent,
724 (dma_addr_t)SWAP32(rbd->b_data),
725 PKT_BUF_SZ, DMA_FROM_DEVICE);
726 /* Get fresh skbuff to replace filled one. */
727 newskb = netdev_alloc_skb_ip_align(dev,
728 PKT_BUF_SZ);
729 if (newskb == NULL) {
730 skb = NULL; /* drop pkt */
731 goto memory_squeeze;
732 }
733
734 /* Pass up the skb already on the Rx ring. */
735 skb_put(skb, pkt_len);
736 rx_in_place = 1;
737 rbd->skb = newskb;
738 dma_addr = dma_map_single(dev->dev.parent,
739 newskb->data,
740 PKT_BUF_SZ,
741 DMA_FROM_DEVICE);
742 rbd->v_data = newskb->data;
743 rbd->b_data = SWAP32(dma_addr);
744 dma_sync_dev(dev, rbd, sizeof(struct i596_rbd));
745 } else {
746 skb = netdev_alloc_skb_ip_align(dev, pkt_len);
747 }
748memory_squeeze:
749 if (skb == NULL) {
750 /* XXX tulip.c can defer packets here!! */
751 dev->stats.rx_dropped++;
752 } else {
753 if (!rx_in_place) {
754 /* 16 byte align the data fields */
755 dma_sync_single_for_cpu(dev->dev.parent,
756 (dma_addr_t)SWAP32(rbd->b_data),
757 PKT_BUF_SZ, DMA_FROM_DEVICE);
758 skb_put_data(skb, rbd->v_data,
759 pkt_len);
760 dma_sync_single_for_device(dev->dev.parent,
761 (dma_addr_t)SWAP32(rbd->b_data),
762 PKT_BUF_SZ, DMA_FROM_DEVICE);
763 }
764 skb->len = pkt_len;
765 skb->protocol = eth_type_trans(skb, dev);
766 netif_rx(skb);
767 dev->stats.rx_packets++;
768 dev->stats.rx_bytes += pkt_len;
769 }
770 } else {
771 DEB(DEB_ERRORS, printk(KERN_DEBUG
772 "%s: Error, rfd.stat = 0x%04x\n",
773 dev->name, rfd->stat));
774 dev->stats.rx_errors++;
775 if (rfd->stat & SWAP16(0x0100))
776 dev->stats.collisions++;
777 if (rfd->stat & SWAP16(0x8000))
778 dev->stats.rx_length_errors++;
779 if (rfd->stat & SWAP16(0x0001))
780 dev->stats.rx_over_errors++;
781 if (rfd->stat & SWAP16(0x0002))
782 dev->stats.rx_fifo_errors++;
783 if (rfd->stat & SWAP16(0x0004))
784 dev->stats.rx_frame_errors++;
785 if (rfd->stat & SWAP16(0x0008))
786 dev->stats.rx_crc_errors++;
787 if (rfd->stat & SWAP16(0x0010))
788 dev->stats.rx_length_errors++;
789 }
790
791 /* Clear the buffer descriptor count and EOF + F flags */
792
793 if (rbd != NULL && (rbd->count & SWAP16(0x4000))) {
794 rbd->count = 0;
795 lp->rbd_head = rbd->v_next;
796 dma_sync_dev(dev, rbd, sizeof(struct i596_rbd));
797 }
798
799 /* Tidy the frame descriptor, marking it as end of list */
800
801 rfd->rbd = I596_NULL;
802 rfd->stat = 0;
803 rfd->cmd = SWAP16(CMD_EOL|CMD_FLEX);
804 rfd->count = 0;
805
806 /* Update record of next frame descriptor to process */
807
808 lp->dma->scb.rfd = rfd->b_next;
809 lp->rfd_head = rfd->v_next;
810 dma_sync_dev(dev, rfd, sizeof(struct i596_rfd));
811
812 /* Remove end-of-list from old end descriptor */
813
814 rfd->v_prev->cmd = SWAP16(CMD_FLEX);
815 dma_sync_dev(dev, rfd->v_prev, sizeof(struct i596_rfd));
816 rfd = lp->rfd_head;
817 dma_sync_cpu(dev, rfd, sizeof(struct i596_rfd));
818 }
819
820 DEB(DEB_RXFRAME, printk(KERN_DEBUG "frames %d\n", frames));
821
822 return 0;
823}
824
825
826static inline void i596_cleanup_cmd(struct net_device *dev, struct i596_private *lp)
827{
828 struct i596_cmd *ptr;
829
830 while (lp->cmd_head != NULL) {
831 ptr = lp->cmd_head;
832 lp->cmd_head = ptr->v_next;
833 lp->cmd_backlog--;
834
835 switch (SWAP16(ptr->command) & 0x7) {
836 case CmdTx:
837 {
838 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
839 struct sk_buff *skb = tx_cmd->skb;
840 dma_unmap_single(dev->dev.parent,
841 tx_cmd->dma_addr,
842 skb->len, DMA_TO_DEVICE);
843
844 dev_kfree_skb(skb);
845
846 dev->stats.tx_errors++;
847 dev->stats.tx_aborted_errors++;
848
849 ptr->v_next = NULL;
850 ptr->b_next = I596_NULL;
851 tx_cmd->cmd.command = 0; /* Mark as free */
852 break;
853 }
854 default:
855 ptr->v_next = NULL;
856 ptr->b_next = I596_NULL;
857 }
858 dma_sync_dev(dev, ptr, sizeof(struct i596_cmd));
859 }
860
861 wait_cmd(dev, lp->dma, 100, "i596_cleanup_cmd timed out");
862 lp->dma->scb.cmd = I596_NULL;
863 dma_sync_dev(dev, &(lp->dma->scb), sizeof(struct i596_scb));
864}
865
866
867static inline void i596_reset(struct net_device *dev, struct i596_private *lp)
868{
869 unsigned long flags;
870
871 DEB(DEB_RESET, printk(KERN_DEBUG "i596_reset\n"));
872
873 spin_lock_irqsave (&lp->lock, flags);
874
875 wait_cmd(dev, lp->dma, 100, "i596_reset timed out");
876
877 netif_stop_queue(dev);
878
879 /* FIXME: this command might cause an lpmc */
880 lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
881 dma_sync_dev(dev, &(lp->dma->scb), sizeof(struct i596_scb));
882 ca(dev);
883
884 /* wait for shutdown */
885 wait_cmd(dev, lp->dma, 1000, "i596_reset 2 timed out");
886 spin_unlock_irqrestore (&lp->lock, flags);
887
888 i596_cleanup_cmd(dev, lp);
889 i596_rx(dev);
890
891 netif_start_queue(dev);
892 init_i596_mem(dev);
893}
894
895
896static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd)
897{
898 struct i596_private *lp = netdev_priv(dev);
899 struct i596_dma *dma = lp->dma;
900 unsigned long flags;
901
902 DEB(DEB_ADDCMD, printk(KERN_DEBUG "i596_add_cmd cmd_head %p\n",
903 lp->cmd_head));
904
905 cmd->status = 0;
906 cmd->command |= SWAP16(CMD_EOL | CMD_INTR);
907 cmd->v_next = NULL;
908 cmd->b_next = I596_NULL;
909 dma_sync_dev(dev, cmd, sizeof(struct i596_cmd));
910
911 spin_lock_irqsave (&lp->lock, flags);
912
913 if (lp->cmd_head != NULL) {
914 lp->cmd_tail->v_next = cmd;
915 lp->cmd_tail->b_next = SWAP32(virt_to_dma(lp, &cmd->status));
916 dma_sync_dev(dev, lp->cmd_tail, sizeof(struct i596_cmd));
917 } else {
918 lp->cmd_head = cmd;
919 wait_cmd(dev, dma, 100, "i596_add_cmd timed out");
920 dma->scb.cmd = SWAP32(virt_to_dma(lp, &cmd->status));
921 dma->scb.command = SWAP16(CUC_START);
922 dma_sync_dev(dev, &(dma->scb), sizeof(struct i596_scb));
923 ca(dev);
924 }
925 lp->cmd_tail = cmd;
926 lp->cmd_backlog++;
927
928 spin_unlock_irqrestore (&lp->lock, flags);
929
930 if (lp->cmd_backlog > max_cmd_backlog) {
931 unsigned long tickssofar = jiffies - lp->last_cmd;
932
933 if (tickssofar < ticks_limit)
934 return;
935
936 printk(KERN_ERR
937 "%s: command unit timed out, status resetting.\n",
938 dev->name);
939#if 1
940 i596_reset(dev, lp);
941#endif
942 }
943}
944
945static int i596_open(struct net_device *dev)
946{
947 DEB(DEB_OPEN, printk(KERN_DEBUG
948 "%s: i596_open() irq %d.\n", dev->name, dev->irq));
949
950 if (init_rx_bufs(dev)) {
951 printk(KERN_ERR "%s: Failed to init rx bufs\n", dev->name);
952 return -EAGAIN;
953 }
954 if (init_i596_mem(dev)) {
955 printk(KERN_ERR "%s: Failed to init memory\n", dev->name);
956 goto out_remove_rx_bufs;
957 }
958 netif_start_queue(dev);
959
960 return 0;
961
962out_remove_rx_bufs:
963 remove_rx_bufs(dev);
964 return -EAGAIN;
965}
966
967static void i596_tx_timeout (struct net_device *dev, unsigned int txqueue)
968{
969 struct i596_private *lp = netdev_priv(dev);
970
971 /* Transmitter timeout, serious problems. */
972 DEB(DEB_ERRORS, printk(KERN_DEBUG
973 "%s: transmit timed out, status resetting.\n",
974 dev->name));
975
976 dev->stats.tx_errors++;
977
978 /* Try to restart the adaptor */
979 if (lp->last_restart == dev->stats.tx_packets) {
980 DEB(DEB_ERRORS, printk(KERN_DEBUG "Resetting board.\n"));
981 /* Shutdown and restart */
982 i596_reset (dev, lp);
983 } else {
984 /* Issue a channel attention signal */
985 DEB(DEB_ERRORS, printk(KERN_DEBUG "Kicking board.\n"));
986 lp->dma->scb.command = SWAP16(CUC_START | RX_START);
987 dma_sync_dev(dev, &(lp->dma->scb), sizeof(struct i596_scb));
988 ca (dev);
989 lp->last_restart = dev->stats.tx_packets;
990 }
991
992 netif_trans_update(dev); /* prevent tx timeout */
993 netif_wake_queue (dev);
994}
995
996
997static netdev_tx_t i596_start_xmit(struct sk_buff *skb, struct net_device *dev)
998{
999 struct i596_private *lp = netdev_priv(dev);
1000 struct tx_cmd *tx_cmd;
1001 struct i596_tbd *tbd;
1002 short length = skb->len;
1003
1004 DEB(DEB_STARTTX, printk(KERN_DEBUG
1005 "%s: i596_start_xmit(%x,%p) called\n",
1006 dev->name, skb->len, skb->data));
1007
1008 if (length < ETH_ZLEN) {
1009 if (skb_padto(skb, ETH_ZLEN))
1010 return NETDEV_TX_OK;
1011 length = ETH_ZLEN;
1012 }
1013
1014 netif_stop_queue(dev);
1015
1016 tx_cmd = lp->dma->tx_cmds + lp->next_tx_cmd;
1017 tbd = lp->dma->tbds + lp->next_tx_cmd;
1018
1019 if (tx_cmd->cmd.command) {
1020 DEB(DEB_ERRORS, printk(KERN_DEBUG
1021 "%s: xmit ring full, dropping packet.\n",
1022 dev->name));
1023 dev->stats.tx_dropped++;
1024
1025 dev_kfree_skb_any(skb);
1026 } else {
1027 if (++lp->next_tx_cmd == TX_RING_SIZE)
1028 lp->next_tx_cmd = 0;
1029 tx_cmd->tbd = SWAP32(virt_to_dma(lp, tbd));
1030 tbd->next = I596_NULL;
1031
1032 tx_cmd->cmd.command = SWAP16(CMD_FLEX | CmdTx);
1033 tx_cmd->skb = skb;
1034
1035 tx_cmd->pad = 0;
1036 tx_cmd->size = 0;
1037 tbd->pad = 0;
1038 tbd->size = SWAP16(EOF | length);
1039
1040 tx_cmd->dma_addr = dma_map_single(dev->dev.parent, skb->data,
1041 skb->len, DMA_TO_DEVICE);
1042 tbd->data = SWAP32(tx_cmd->dma_addr);
1043
1044 DEB(DEB_TXADDR, print_eth(skb->data, "tx-queued"));
1045 dma_sync_dev(dev, tx_cmd, sizeof(struct tx_cmd));
1046 dma_sync_dev(dev, tbd, sizeof(struct i596_tbd));
1047 i596_add_cmd(dev, &tx_cmd->cmd);
1048
1049 dev->stats.tx_packets++;
1050 dev->stats.tx_bytes += length;
1051 }
1052
1053 netif_start_queue(dev);
1054
1055 return NETDEV_TX_OK;
1056}
1057
1058static void print_eth(unsigned char *add, char *str)
1059{
1060 printk(KERN_DEBUG "i596 0x%p, %pM --> %pM %02X%02X, %s\n",
1061 add, add + 6, add, add[12], add[13], str);
1062}
1063static const struct net_device_ops i596_netdev_ops = {
1064 .ndo_open = i596_open,
1065 .ndo_stop = i596_close,
1066 .ndo_start_xmit = i596_start_xmit,
1067 .ndo_set_rx_mode = set_multicast_list,
1068 .ndo_tx_timeout = i596_tx_timeout,
1069 .ndo_validate_addr = eth_validate_addr,
1070 .ndo_set_mac_address = eth_mac_addr,
1071#ifdef CONFIG_NET_POLL_CONTROLLER
1072 .ndo_poll_controller = i596_poll_controller,
1073#endif
1074};
1075
1076static int i82596_probe(struct net_device *dev)
1077{
1078 struct i596_private *lp = netdev_priv(dev);
1079 int ret;
1080
1081 /* This lot is ensure things have been cache line aligned. */
1082 BUILD_BUG_ON(sizeof(struct i596_rfd) != 32);
1083 BUILD_BUG_ON(sizeof(struct i596_rbd) & 31);
1084 BUILD_BUG_ON(sizeof(struct tx_cmd) & 31);
1085 BUILD_BUG_ON(sizeof(struct i596_tbd) != 32);
1086#ifndef __LP64__
1087 BUILD_BUG_ON(sizeof(struct i596_dma) > 4096);
1088#endif
1089
1090 if (!dev->base_addr || !dev->irq)
1091 return -ENODEV;
1092
1093 dev->netdev_ops = &i596_netdev_ops;
1094 dev->watchdog_timeo = TX_TIMEOUT;
1095
1096 memset(lp->dma, 0, sizeof(struct i596_dma));
1097 lp->dma->scb.command = 0;
1098 lp->dma->scb.cmd = I596_NULL;
1099 lp->dma->scb.rfd = I596_NULL;
1100 spin_lock_init(&lp->lock);
1101
1102 dma_sync_dev(dev, lp->dma, sizeof(struct i596_dma));
1103
1104 ret = register_netdev(dev);
1105 if (ret)
1106 return ret;
1107
1108 DEB(DEB_PROBE, printk(KERN_INFO "%s: 82596 at %#3lx, %pM IRQ %d.\n",
1109 dev->name, dev->base_addr, dev->dev_addr,
1110 dev->irq));
1111 DEB(DEB_INIT, printk(KERN_INFO
1112 "%s: dma at 0x%p (%d bytes), lp->scb at 0x%p\n",
1113 dev->name, lp->dma, (int)sizeof(struct i596_dma),
1114 &lp->dma->scb));
1115
1116 return 0;
1117}
1118
1119#ifdef CONFIG_NET_POLL_CONTROLLER
1120static void i596_poll_controller(struct net_device *dev)
1121{
1122 disable_irq(dev->irq);
1123 i596_interrupt(dev->irq, dev);
1124 enable_irq(dev->irq);
1125}
1126#endif
1127
1128static irqreturn_t i596_interrupt(int irq, void *dev_id)
1129{
1130 struct net_device *dev = dev_id;
1131 struct i596_private *lp;
1132 struct i596_dma *dma;
1133 unsigned short status, ack_cmd = 0;
1134
1135 lp = netdev_priv(dev);
1136 dma = lp->dma;
1137
1138 spin_lock (&lp->lock);
1139
1140 wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1141 status = SWAP16(dma->scb.status);
1142
1143 DEB(DEB_INTS, printk(KERN_DEBUG
1144 "%s: i596 interrupt, IRQ %d, status %4.4x.\n",
1145 dev->name, dev->irq, status));
1146
1147 ack_cmd = status & 0xf000;
1148
1149 if (!ack_cmd) {
1150 DEB(DEB_ERRORS, printk(KERN_DEBUG
1151 "%s: interrupt with no events\n",
1152 dev->name));
1153 spin_unlock (&lp->lock);
1154 return IRQ_NONE;
1155 }
1156
1157 if ((status & 0x8000) || (status & 0x2000)) {
1158 struct i596_cmd *ptr;
1159
1160 if ((status & 0x8000))
1161 DEB(DEB_INTS,
1162 printk(KERN_DEBUG
1163 "%s: i596 interrupt completed command.\n",
1164 dev->name));
1165 if ((status & 0x2000))
1166 DEB(DEB_INTS,
1167 printk(KERN_DEBUG
1168 "%s: i596 interrupt command unit inactive %x.\n",
1169 dev->name, status & 0x0700));
1170
1171 while (lp->cmd_head != NULL) {
1172 dma_sync_cpu(dev, lp->cmd_head, sizeof(struct i596_cmd));
1173 if (!(lp->cmd_head->status & SWAP16(STAT_C)))
1174 break;
1175
1176 ptr = lp->cmd_head;
1177
1178 DEB(DEB_STATUS,
1179 printk(KERN_DEBUG
1180 "cmd_head->status = %04x, ->command = %04x\n",
1181 SWAP16(lp->cmd_head->status),
1182 SWAP16(lp->cmd_head->command)));
1183 lp->cmd_head = ptr->v_next;
1184 lp->cmd_backlog--;
1185
1186 switch (SWAP16(ptr->command) & 0x7) {
1187 case CmdTx:
1188 {
1189 struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
1190 struct sk_buff *skb = tx_cmd->skb;
1191
1192 if (ptr->status & SWAP16(STAT_OK)) {
1193 DEB(DEB_TXADDR,
1194 print_eth(skb->data, "tx-done"));
1195 } else {
1196 dev->stats.tx_errors++;
1197 if (ptr->status & SWAP16(0x0020))
1198 dev->stats.collisions++;
1199 if (!(ptr->status & SWAP16(0x0040)))
1200 dev->stats.tx_heartbeat_errors++;
1201 if (ptr->status & SWAP16(0x0400))
1202 dev->stats.tx_carrier_errors++;
1203 if (ptr->status & SWAP16(0x0800))
1204 dev->stats.collisions++;
1205 if (ptr->status & SWAP16(0x1000))
1206 dev->stats.tx_aborted_errors++;
1207 }
1208 dma_unmap_single(dev->dev.parent,
1209 tx_cmd->dma_addr,
1210 skb->len, DMA_TO_DEVICE);
1211 dev_consume_skb_irq(skb);
1212
1213 tx_cmd->cmd.command = 0; /* Mark free */
1214 break;
1215 }
1216 case CmdTDR:
1217 {
1218 unsigned short status = SWAP16(((struct tdr_cmd *)ptr)->status);
1219
1220 if (status & 0x8000) {
1221 DEB(DEB_ANY,
1222 printk(KERN_DEBUG "%s: link ok.\n",
1223 dev->name));
1224 } else {
1225 if (status & 0x4000)
1226 printk(KERN_ERR
1227 "%s: Transceiver problem.\n",
1228 dev->name);
1229 if (status & 0x2000)
1230 printk(KERN_ERR
1231 "%s: Termination problem.\n",
1232 dev->name);
1233 if (status & 0x1000)
1234 printk(KERN_ERR
1235 "%s: Short circuit.\n",
1236 dev->name);
1237
1238 DEB(DEB_TDR,
1239 printk(KERN_DEBUG "%s: Time %d.\n",
1240 dev->name, status & 0x07ff));
1241 }
1242 break;
1243 }
1244 case CmdConfigure:
1245 /*
1246 * Zap command so set_multicast_list() know
1247 * it is free
1248 */
1249 ptr->command = 0;
1250 break;
1251 }
1252 ptr->v_next = NULL;
1253 ptr->b_next = I596_NULL;
1254 dma_sync_dev(dev, ptr, sizeof(struct i596_cmd));
1255 lp->last_cmd = jiffies;
1256 }
1257
1258 /* This mess is arranging that only the last of any outstanding
1259 * commands has the interrupt bit set. Should probably really
1260 * only add to the cmd queue when the CU is stopped.
1261 */
1262 ptr = lp->cmd_head;
1263 while ((ptr != NULL) && (ptr != lp->cmd_tail)) {
1264 struct i596_cmd *prev = ptr;
1265
1266 ptr->command &= SWAP16(0x1fff);
1267 ptr = ptr->v_next;
1268 dma_sync_dev(dev, prev, sizeof(struct i596_cmd));
1269 }
1270
1271 if (lp->cmd_head != NULL)
1272 ack_cmd |= CUC_START;
1273 dma->scb.cmd = SWAP32(virt_to_dma(lp, &lp->cmd_head->status));
1274 dma_sync_dev(dev, &dma->scb, sizeof(struct i596_scb));
1275 }
1276 if ((status & 0x1000) || (status & 0x4000)) {
1277 if ((status & 0x4000))
1278 DEB(DEB_INTS,
1279 printk(KERN_DEBUG
1280 "%s: i596 interrupt received a frame.\n",
1281 dev->name));
1282 i596_rx(dev);
1283 /* Only RX_START if stopped - RGH 07-07-96 */
1284 if (status & 0x1000) {
1285 if (netif_running(dev)) {
1286 DEB(DEB_ERRORS,
1287 printk(KERN_DEBUG
1288 "%s: i596 interrupt receive unit inactive, status 0x%x\n",
1289 dev->name, status));
1290 ack_cmd |= RX_START;
1291 dev->stats.rx_errors++;
1292 dev->stats.rx_fifo_errors++;
1293 rebuild_rx_bufs(dev);
1294 }
1295 }
1296 }
1297 wait_cmd(dev, dma, 100, "i596 interrupt, timeout");
1298 dma->scb.command = SWAP16(ack_cmd);
1299 dma_sync_dev(dev, &dma->scb, sizeof(struct i596_scb));
1300
1301 /* DANGER: I suspect that some kind of interrupt
1302 acknowledgement aside from acking the 82596 might be needed
1303 here... but it's running acceptably without */
1304
1305 ca(dev);
1306
1307 wait_cmd(dev, dma, 100, "i596 interrupt, exit timeout");
1308 DEB(DEB_INTS, printk(KERN_DEBUG "%s: exiting interrupt.\n", dev->name));
1309
1310 spin_unlock (&lp->lock);
1311 return IRQ_HANDLED;
1312}
1313
1314static int i596_close(struct net_device *dev)
1315{
1316 struct i596_private *lp = netdev_priv(dev);
1317 unsigned long flags;
1318
1319 netif_stop_queue(dev);
1320
1321 DEB(DEB_INIT,
1322 printk(KERN_DEBUG
1323 "%s: Shutting down ethercard, status was %4.4x.\n",
1324 dev->name, SWAP16(lp->dma->scb.status)));
1325
1326 spin_lock_irqsave(&lp->lock, flags);
1327
1328 wait_cmd(dev, lp->dma, 100, "close1 timed out");
1329 lp->dma->scb.command = SWAP16(CUC_ABORT | RX_ABORT);
1330 dma_sync_dev(dev, &lp->dma->scb, sizeof(struct i596_scb));
1331
1332 ca(dev);
1333
1334 wait_cmd(dev, lp->dma, 100, "close2 timed out");
1335 spin_unlock_irqrestore(&lp->lock, flags);
1336 DEB(DEB_STRUCT, i596_display_data(dev));
1337 i596_cleanup_cmd(dev, lp);
1338
1339 free_irq(dev->irq, dev);
1340 remove_rx_bufs(dev);
1341
1342 return 0;
1343}
1344
1345/*
1346 * Set or clear the multicast filter for this adaptor.
1347 */
1348
1349static void set_multicast_list(struct net_device *dev)
1350{
1351 struct i596_private *lp = netdev_priv(dev);
1352 struct i596_dma *dma = lp->dma;
1353 int config = 0, cnt;
1354
1355 DEB(DEB_MULTI,
1356 printk(KERN_DEBUG
1357 "%s: set multicast list, %d entries, promisc %s, allmulti %s\n",
1358 dev->name, netdev_mc_count(dev),
1359 dev->flags & IFF_PROMISC ? "ON" : "OFF",
1360 dev->flags & IFF_ALLMULTI ? "ON" : "OFF"));
1361
1362 if ((dev->flags & IFF_PROMISC) &&
1363 !(dma->cf_cmd.i596_config[8] & 0x01)) {
1364 dma->cf_cmd.i596_config[8] |= 0x01;
1365 config = 1;
1366 }
1367 if (!(dev->flags & IFF_PROMISC) &&
1368 (dma->cf_cmd.i596_config[8] & 0x01)) {
1369 dma->cf_cmd.i596_config[8] &= ~0x01;
1370 config = 1;
1371 }
1372 if ((dev->flags & IFF_ALLMULTI) &&
1373 (dma->cf_cmd.i596_config[11] & 0x20)) {
1374 dma->cf_cmd.i596_config[11] &= ~0x20;
1375 config = 1;
1376 }
1377 if (!(dev->flags & IFF_ALLMULTI) &&
1378 !(dma->cf_cmd.i596_config[11] & 0x20)) {
1379 dma->cf_cmd.i596_config[11] |= 0x20;
1380 config = 1;
1381 }
1382 if (config) {
1383 if (dma->cf_cmd.cmd.command)
1384 printk(KERN_INFO
1385 "%s: config change request already queued\n",
1386 dev->name);
1387 else {
1388 dma->cf_cmd.cmd.command = SWAP16(CmdConfigure);
1389 dma_sync_dev(dev, &dma->cf_cmd, sizeof(struct cf_cmd));
1390 i596_add_cmd(dev, &dma->cf_cmd.cmd);
1391 }
1392 }
1393
1394 cnt = netdev_mc_count(dev);
1395 if (cnt > MAX_MC_CNT) {
1396 cnt = MAX_MC_CNT;
1397 printk(KERN_NOTICE "%s: Only %d multicast addresses supported",
1398 dev->name, cnt);
1399 }
1400
1401 if (!netdev_mc_empty(dev)) {
1402 struct netdev_hw_addr *ha;
1403 unsigned char *cp;
1404 struct mc_cmd *cmd;
1405
1406 cmd = &dma->mc_cmd;
1407 cmd->cmd.command = SWAP16(CmdMulticastList);
1408 cmd->mc_cnt = SWAP16(netdev_mc_count(dev) * 6);
1409 cp = cmd->mc_addrs;
1410 netdev_for_each_mc_addr(ha, dev) {
1411 if (!cnt--)
1412 break;
1413 memcpy(cp, ha->addr, ETH_ALEN);
1414 if (i596_debug > 1)
1415 DEB(DEB_MULTI,
1416 printk(KERN_DEBUG
1417 "%s: Adding address %pM\n",
1418 dev->name, cp));
1419 cp += ETH_ALEN;
1420 }
1421 dma_sync_dev(dev, &dma->mc_cmd, sizeof(struct mc_cmd));
1422 i596_add_cmd(dev, &cmd->cmd);
1423 }
1424}