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Move ACCESS_ONCE() to <linux/compiler.h>
[linux-2.6/openmoko-kernel/knife-kernel.git] / drivers / net / lp486e.c
blob591a7e4220c75058d7f1361d36f60d61274e10af
1 /* Intel Professional Workstation/panther ethernet driver */
2 /* lp486e.c: A panther 82596 ethernet driver for linux. */
3 /*
4 History and copyrights:
5
6 Driver skeleton
7 Written 1993 by Donald Becker.
8 Copyright 1993 United States Government as represented by the Director,
9 National Security Agency. This software may only be used and
10 distributed according to the terms of the GNU General Public License
11 as modified by SRC, incorporated herein by reference.
12
13 The author may be reached as becker@scyld.com, or C/O
14 Scyld Computing Corporation
15 410 Severn Ave., Suite 210
16 Annapolis MD 21403
17
18 Apricot
19 Written 1994 by Mark Evans.
20 This driver is for the Apricot 82596 bus-master interface
21
22 Modularised 12/94 Mark Evans
23
24 Professional Workstation
25 Derived from apricot.c by Ard van Breemen
26 <ard@murphy.nl>|<ard@cstmel.hobby.nl>|<ard@cstmel.nl.eu.org>
27
28 Credits:
29 Thanks to Murphy Software BV for letting me write this in their time.
30 Well, actually, I get payed doing this...
31 (Also: see http://www.murphy.nl for murphy, and my homepage ~ard for
32 more information on the Professional Workstation)
33
34 Present version
35 aeb@cwi.nl
36 */
37 /*
38 There are currently two motherboards that I know of in the
39 professional workstation. The only one that I know is the
40 intel panther motherboard. -- ard
41 */
42 /*
43 The pws is equipped with an intel 82596. This is a very intelligent controller
44 which runs its own micro-code. Communication with the hostprocessor is done
45 through linked lists of commands and buffers in the hostprocessors memory.
46 A complete description of the 82596 is available from intel. Search for
47 a file called "29021806.pdf". It is a complete description of the chip itself.
48 To use it for the pws some additions are needed regarding generation of
49 the PORT and CA signal, and the interrupt glue needed for a pc.
50 I/O map:
51 PORT SIZE ACTION MEANING
52 0xCB0 2 WRITE Lower 16 bits for PORT command
53 0xCB2 2 WRITE Upper 16 bits for PORT command, and issue of PORT command
54 0xCB4 1 WRITE Generation of CA signal
55 0xCB8 1 WRITE Clear interrupt glue
56 All other communication is through memory!
57 */
58
59 #include <linux/module.h>
60 #include <linux/init.h>
61 #include <linux/delay.h>
62 #include <linux/kernel.h>
63 #include <linux/string.h>
64 #include <linux/errno.h>
65 #include <linux/ioport.h>
66 #include <linux/slab.h>
67 #include <linux/interrupt.h>
68 #include <linux/netdevice.h>
69 #include <linux/etherdevice.h>
70 #include <linux/skbuff.h>
71 #include <linux/bitops.h>
72
73 #include <asm/io.h>
74 #include <asm/dma.h>
75
76 #define DRV_NAME "lp486e"
77
78 /* debug print flags */
79 #define LOG_SRCDST 0x80000000
80 #define LOG_STATINT 0x40000000
81 #define LOG_STARTINT 0x20000000
82
83 #define i596_debug debug
84
85 static int i596_debug = 0;
86
87 static const char * const medianame[] = {
88 "10baseT", "AUI",
89 "10baseT-FD", "AUI-FD",
90 };
91
92 #define LP486E_TOTAL_SIZE 16
93
94 #define I596_NULL (0xffffffff)
95
96 #define CMD_EOL 0x8000 /* The last command of the list, stop. */
97 #define CMD_SUSP 0x4000 /* Suspend after doing cmd. */
98 #define CMD_INTR 0x2000 /* Interrupt after doing cmd. */
99
100 #define CMD_FLEX 0x0008 /* Enable flexible memory model */
101
102 enum commands {
103 CmdNOP = 0,
104 CmdIASetup = 1,
105 CmdConfigure = 2,
106 CmdMulticastList = 3,
107 CmdTx = 4,
108 CmdTDR = 5,
109 CmdDump = 6,
110 CmdDiagnose = 7
111 };
112
113 #if 0
114 static const char *CUcmdnames[8] = { "NOP", "IASetup", "Configure", "MulticastList",
115 "Tx", "TDR", "Dump", "Diagnose" };
116 #endif
117
118 /* Status word bits */
119 #define STAT_CX 0x8000 /* The CU finished executing a command
120 with the Interrupt bit set */
121 #define STAT_FR 0x4000 /* The RU finished receiving a frame */
122 #define STAT_CNA 0x2000 /* The CU left the active state */
123 #define STAT_RNR 0x1000 /* The RU left the active state */
124 #define STAT_ACK (STAT_CX | STAT_FR | STAT_CNA | STAT_RNR)
125 #define STAT_CUS 0x0700 /* Status of CU: 0: idle, 1: suspended,
126 2: active, 3-7: unused */
127 #define STAT_RUS 0x00f0 /* Status of RU: 0: idle, 1: suspended,
128 2: no resources, 4: ready,
129 10: no resources due to no more RBDs,
130 12: no more RBDs, other: unused */
131 #define STAT_T 0x0008 /* Bus throttle timers loaded */
132 #define STAT_ZERO 0x0807 /* Always zero */
133
134 #if 0
135 static char *CUstates[8] = {
136 "idle", "suspended", "active", 0, 0, 0, 0, 0
137 };
138 static char *RUstates[16] = {
139 "idle", "suspended", "no resources", 0, "ready", 0, 0, 0,
140 0, 0, "no RBDs", 0, "out of RBDs", 0, 0, 0
141 };
142
143 static void
144 i596_out_status(int status) {
145 int bad = 0;
146 char *s;
147
148 printk("status %4.4x:", status);
149 if (status == 0xffff)
150 printk(" strange..\n");
151 else {
152 if (status & STAT_CX)
153 printk(" CU done");
154 if (status & STAT_CNA)
155 printk(" CU stopped");
156 if (status & STAT_FR)
157 printk(" got a frame");
158 if (status & STAT_RNR)
159 printk(" RU stopped");
160 if (status & STAT_T)
161 printk(" throttled");
162 if (status & STAT_ZERO)
163 bad = 1;
164 s = CUstates[(status & STAT_CUS) >> 8];
165 if (!s)
166 bad = 1;
167 else
168 printk(" CU(%s)", s);
169 s = RUstates[(status & STAT_RUS) >> 4];
170 if (!s)
171 bad = 1;
172 else
173 printk(" RU(%s)", s);
174 if (bad)
175 printk(" bad status");
176 printk("\n");
177 }
178 }
179 #endif
180
181 /* Command word bits */
182 #define ACK_CX 0x8000
183 #define ACK_FR 0x4000
184 #define ACK_CNA 0x2000
185 #define ACK_RNR 0x1000
186
187 #define CUC_START 0x0100
188 #define CUC_RESUME 0x0200
189 #define CUC_SUSPEND 0x0300
190 #define CUC_ABORT 0x0400
191
192 #define RX_START 0x0010
193 #define RX_RESUME 0x0020
194 #define RX_SUSPEND 0x0030
195 #define RX_ABORT 0x0040
196
197 typedef u32 phys_addr;
198
199 static inline phys_addr
200 va_to_pa(void *x) {
201 return x ? virt_to_bus(x) : I596_NULL;
202 }
203
204 static inline void *
205 pa_to_va(phys_addr x) {
206 return (x == I596_NULL) ? NULL : bus_to_virt(x);
207 }
208
209 /* status bits for cmd */
210 #define CMD_STAT_C 0x8000 /* CU command complete */
211 #define CMD_STAT_B 0x4000 /* CU command in progress */
212 #define CMD_STAT_OK 0x2000 /* CU command completed without errors */
213 #define CMD_STAT_A 0x1000 /* CU command abnormally terminated */
214
215 struct i596_cmd { /* 8 bytes */
216 unsigned short status;
217 unsigned short command;
218 phys_addr pa_next; /* va_to_pa(struct i596_cmd *next) */
219 };
220
221 #define EOF 0x8000
222 #define SIZE_MASK 0x3fff
223
224 struct i596_tbd {
225 unsigned short size;
226 unsigned short pad;
227 phys_addr pa_next; /* va_to_pa(struct i596_tbd *next) */
228 phys_addr pa_data; /* va_to_pa(char *data) */
229 struct sk_buff *skb;
230 };
231
232 struct tx_cmd {
233 struct i596_cmd cmd;
234 phys_addr pa_tbd; /* va_to_pa(struct i596_tbd *tbd) */
235 unsigned short size;
236 unsigned short pad;
237 };
238
239 /* status bits for rfd */
240 #define RFD_STAT_C 0x8000 /* Frame reception complete */
241 #define RFD_STAT_B 0x4000 /* Frame reception in progress */
242 #define RFD_STAT_OK 0x2000 /* Frame received without errors */
243 #define RFD_STATUS 0x1fff
244 #define RFD_LENGTH_ERR 0x1000
245 #define RFD_CRC_ERR 0x0800
246 #define RFD_ALIGN_ERR 0x0400
247 #define RFD_NOBUFS_ERR 0x0200
248 #define RFD_DMA_ERR 0x0100 /* DMA overrun failure to acquire system bus */
249 #define RFD_SHORT_FRAME_ERR 0x0080
250 #define RFD_NOEOP_ERR 0x0040
251 #define RFD_TRUNC_ERR 0x0020
252 #define RFD_MULTICAST 0x0002 /* 0: destination had our address
253 1: destination was broadcast/multicast */
254 #define RFD_COLLISION 0x0001
255
256 /* receive frame descriptor */
257 struct i596_rfd {
258 unsigned short stat;
259 unsigned short cmd;
260 phys_addr pa_next; /* va_to_pa(struct i596_rfd *next) */
261 phys_addr pa_rbd; /* va_to_pa(struct i596_rbd *rbd) */
262 unsigned short count;
263 unsigned short size;
264 char data[1532];
265 };
266
267 #define RBD_EL 0x8000
268 #define RBD_P 0x4000
269 #define RBD_SIZEMASK 0x3fff
270 #define RBD_EOF 0x8000
271 #define RBD_F 0x4000
272
273 /* receive buffer descriptor */
274 struct i596_rbd {
275 unsigned short size;
276 unsigned short pad;
277 phys_addr pa_next; /* va_to_pa(struct i596_tbd *next) */
278 phys_addr pa_data; /* va_to_pa(char *data) */
279 phys_addr pa_prev; /* va_to_pa(struct i596_tbd *prev) */
280
281 /* Driver private part */
282 struct sk_buff *skb;
283 };
284
285 #define RX_RING_SIZE 64
286 #define RX_SKBSIZE (ETH_FRAME_LEN+10)
287 #define RX_RBD_SIZE 32
288
289 /* System Control Block - 40 bytes */
290 struct i596_scb {
291 u16 status; /* 0 */
292 u16 command; /* 2 */
293 phys_addr pa_cmd; /* 4 - va_to_pa(struct i596_cmd *cmd) */
294 phys_addr pa_rfd; /* 8 - va_to_pa(struct i596_rfd *rfd) */
295 u32 crc_err; /* 12 */
296 u32 align_err; /* 16 */
297 u32 resource_err; /* 20 */
298 u32 over_err; /* 24 */
299 u32 rcvdt_err; /* 28 */
300 u32 short_err; /* 32 */
301 u16 t_on; /* 36 */
302 u16 t_off; /* 38 */
303 };
304
305 /* Intermediate System Configuration Pointer - 8 bytes */
306 struct i596_iscp {
307 u32 busy; /* 0 */
308 phys_addr pa_scb; /* 4 - va_to_pa(struct i596_scb *scb) */
309 };
310
311 /* System Configuration Pointer - 12 bytes */
312 struct i596_scp {
313 u32 sysbus; /* 0 */
314 u32 pad; /* 4 */
315 phys_addr pa_iscp; /* 8 - va_to_pa(struct i596_iscp *iscp) */
316 };
317
318 /* Selftest and dump results - needs 16-byte alignment */
319 /*
320 * The size of the dump area is 304 bytes. When the dump is executed
321 * by the Port command an extra word will be appended to the dump area.
322 * The extra word is a copy of the Dump status word (containing the
323 * C, B, OK bits). [I find 0xa006, with a0 for C+OK and 6 for dump]
324 */
325 struct i596_dump {
326 u16 dump[153]; /* (304 = 130h) + 2 bytes */
327 };
328
329 struct i596_private { /* aligned to a 16-byte boundary */
330 struct i596_scp scp; /* 0 - needs 16-byte alignment */
331 struct i596_iscp iscp; /* 12 */
332 struct i596_scb scb; /* 20 */
333 u32 dummy; /* 60 */
334 struct i596_dump dump; /* 64 - needs 16-byte alignment */
335
336 struct i596_cmd set_add;
337 char eth_addr[8]; /* directly follows set_add */
338
339 struct i596_cmd set_conf;
340 char i596_config[16]; /* directly follows set_conf */
341
342 struct i596_cmd tdr;
343 unsigned long tdr_stat; /* directly follows tdr */
344
345 int last_restart;
346 struct i596_rbd *rbd_list;
347 struct i596_rbd *rbd_tail;
348 struct i596_rfd *rx_tail;
349 struct i596_cmd *cmd_tail;
350 struct i596_cmd *cmd_head;
351 int cmd_backlog;
352 unsigned long last_cmd;
353 spinlock_t cmd_lock;
354 };
355
356 static char init_setup[14] = {
357 0x8E, /* length 14 bytes, prefetch on */
358 0xC8, /* default: fifo to 8, monitor off */
359 0x40, /* default: don't save bad frames (apricot.c had 0x80) */
360 0x2E, /* (default is 0x26)
361 No source address insertion, 8 byte preamble */
362 0x00, /* default priority and backoff */
363 0x60, /* default interframe spacing */
364 0x00, /* default slot time LSB */
365 0xf2, /* default slot time and nr of retries */
366 0x00, /* default various bits
367 (0: promiscuous mode, 1: broadcast disable,
368 2: encoding mode, 3: transmit on no CRS,
369 4: no CRC insertion, 5: CRC type,
370 6: bit stuffing, 7: padding) */
371 0x00, /* default carrier sense and collision detect */
372 0x40, /* default minimum frame length */
373 0xff, /* (default is 0xff, and that is what apricot.c has;
374 elp486.c has 0xfb: Enable crc append in memory.) */
375 0x00, /* default: not full duplex */
376 0x7f /* (default is 0x3f) multi IA */
377 };
378
379 static int i596_open(struct net_device *dev);
380 static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev);
381 static irqreturn_t i596_interrupt(int irq, void *dev_id);
382 static int i596_close(struct net_device *dev);
383 static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd);
384 static void print_eth(char *);
385 static void set_multicast_list(struct net_device *dev);
386 static void i596_tx_timeout(struct net_device *dev);
387
388 static int
389 i596_timeout(struct net_device *dev, char *msg, int ct) {
390 struct i596_private *lp;
391 int boguscnt = ct;
392
393 lp = (struct i596_private *) dev->priv;
394 while (lp->scb.command) {
395 if (--boguscnt == 0) {
396 printk("%s: %s timed out - stat %4.4x, cmd %4.4x\n",
397 dev->name, msg,
398 lp->scb.status, lp->scb.command);
399 return 1;
400 }
401 udelay(5);
402 barrier();
403 }
404 return 0;
405 }
406
407 static inline int
408 init_rx_bufs(struct net_device *dev, int num) {
409 struct i596_private *lp;
410 struct i596_rfd *rfd;
411 int i;
412 // struct i596_rbd *rbd;
413
414 lp = (struct i596_private *) dev->priv;
415 lp->scb.pa_rfd = I596_NULL;
416
417 for (i = 0; i < num; i++) {
418 rfd = kmalloc(sizeof(struct i596_rfd), GFP_KERNEL);
419 if (rfd == NULL)
420 break;
421
422 rfd->stat = 0;
423 rfd->pa_rbd = I596_NULL;
424 rfd->count = 0;
425 rfd->size = 1532;
426 if (i == 0) {
427 rfd->cmd = CMD_EOL;
428 lp->rx_tail = rfd;
429 } else {
430 rfd->cmd = 0;
431 }
432 rfd->pa_next = lp->scb.pa_rfd;
433 lp->scb.pa_rfd = va_to_pa(rfd);
434 lp->rx_tail->pa_next = lp->scb.pa_rfd;
435 }
436
437 #if 0
438 for (i = 0; i<RX_RBD_SIZE; i++) {
439 rbd = kmalloc(sizeof(struct i596_rbd), GFP_KERNEL);
440 if (rbd) {
441 rbd->pad = 0;
442 rbd->count = 0;
443 rbd->skb = dev_alloc_skb(RX_SKBSIZE);
444 if (!rbd->skb) {
445 printk("dev_alloc_skb failed");
446 }
447 rbd->next = rfd->rbd;
448 if (i) {
449 rfd->rbd->prev = rbd;
450 rbd->size = RX_SKBSIZE;
451 } else {
452 rbd->size = (RX_SKBSIZE | RBD_EL);
453 lp->rbd_tail = rbd;
454 }
455
456 rfd->rbd = rbd;
457 } else {
458 printk("Could not kmalloc rbd\n");
459 }
460 }
461 lp->rbd_tail->next = rfd->rbd;
462 #endif
463 return (i);
464 }
465
466 static inline void
467 remove_rx_bufs(struct net_device *dev) {
468 struct i596_private *lp;
469 struct i596_rfd *rfd;
470
471 lp = (struct i596_private *) dev->priv;
472 lp->rx_tail->pa_next = I596_NULL;
473
474 do {
475 rfd = pa_to_va(lp->scb.pa_rfd);
476 lp->scb.pa_rfd = rfd->pa_next;
477 kfree(rfd);
478 } while (rfd != lp->rx_tail);
479
480 lp->rx_tail = NULL;
481
482 #if 0
483 for (lp->rbd_list) {
484 }
485 #endif
486 }
487
488 #define PORT_RESET 0x00 /* reset 82596 */
489 #define PORT_SELFTEST 0x01 /* selftest */
490 #define PORT_ALTSCP 0x02 /* alternate SCB address */
491 #define PORT_DUMP 0x03 /* dump */
492
493 #define IOADDR 0xcb0 /* real constant */
494 #define IRQ 10 /* default IRQ - can be changed by ECU */
495
496 /* The 82596 requires two 16-bit write cycles for a port command */
497 static inline void
498 PORT(phys_addr a, unsigned int cmd) {
499 if (a & 0xf)
500 printk("lp486e.c: PORT: address not aligned\n");
501 outw(((a & 0xffff) | cmd), IOADDR);
502 outw(((a>>16) & 0xffff), IOADDR+2);
503 }
504
505 static inline void
506 CA(void) {
507 outb(0, IOADDR+4);
508 udelay(8);
509 }
510
511 static inline void
512 CLEAR_INT(void) {
513 outb(0, IOADDR+8);
514 }
515
516 #if 0
517 /* selftest or dump */
518 static void
519 i596_port_do(struct net_device *dev, int portcmd, char *cmdname) {
520 struct i596_private *lp = dev->priv;
521 u16 *outp;
522 int i, m;
523
524 memset((void *)&(lp->dump), 0, sizeof(struct i596_dump));
525 outp = &(lp->dump.dump[0]);
526
527 PORT(va_to_pa(outp), portcmd);
528 mdelay(30); /* random, unmotivated */
529
530 printk("lp486e i82596 %s result:\n", cmdname);
531 for (m = ARRAY_SIZE(lp->dump.dump); m && lp->dump.dump[m-1] == 0; m--)
532 ;
533 for (i = 0; i < m; i++) {
534 printk(" %04x", lp->dump.dump[i]);
535 if (i%8 == 7)
536 printk("\n");
537 }
538 printk("\n");
539 }
540 #endif
541
542 static int
543 i596_scp_setup(struct net_device *dev) {
544 struct i596_private *lp = dev->priv;
545 int boguscnt;
546
547 /* Setup SCP, ISCP, SCB */
548 /*
549 * sysbus bits:
550 * only a single byte is significant - here 0x44
551 * 0x80: big endian mode (details depend on stepping)
552 * 0x40: 1
553 * 0x20: interrupt pin is active low
554 * 0x10: lock function disabled
555 * 0x08: external triggering of bus throttle timers
556 * 0x06: 00: 82586 compat mode, 01: segmented mode, 10: linear mode
557 * 0x01: unused
558 */
559 lp->scp.sysbus = 0x00440000; /* linear mode */
560 lp->scp.pad = 0; /* must be zero */
561 lp->scp.pa_iscp = va_to_pa(&(lp->iscp));
562
563 /*
564 * The CPU sets the ISCP to 1 before it gives the first CA()
565 */
566 lp->iscp.busy = 0x0001;
567 lp->iscp.pa_scb = va_to_pa(&(lp->scb));
568
569 lp->scb.command = 0;
570 lp->scb.status = 0;
571 lp->scb.pa_cmd = I596_NULL;
572 /* lp->scb.pa_rfd has been initialised already */
573
574 lp->last_cmd = jiffies;
575 lp->cmd_backlog = 0;
576 lp->cmd_head = NULL;
577
578 /*
579 * Reset the 82596.
580 * We need to wait 10 systemclock cycles, and
581 * 5 serial clock cycles.
582 */
583 PORT(0, PORT_RESET); /* address part ignored */
584 udelay(100);
585
586 /*
587 * Before the CA signal is asserted, the default SCP address
588 * (0x00fffff4) can be changed to a 16-byte aligned value
589 */
590 PORT(va_to_pa(&lp->scp), PORT_ALTSCP); /* change the scp address */
591
592 /*
593 * The initialization procedure begins when a
594 * Channel Attention signal is asserted after a reset.
595 */
596
597 CA();
598
599 /*
600 * The ISCP busy is cleared by the 82596 after the SCB address is read.
601 */
602 boguscnt = 100;
603 while (lp->iscp.busy) {
604 if (--boguscnt == 0) {
605 /* No i82596 present? */
606 printk("%s: i82596 initialization timed out\n",
607 dev->name);
608 return 1;
609 }
610 udelay(5);
611 barrier();
612 }
613 /* I find here boguscnt==100, so no delay was required. */
614
615 return 0;
616 }
617
618 static int
619 init_i596(struct net_device *dev) {
620 struct i596_private *lp;
621
622 if (i596_scp_setup(dev))
623 return 1;
624
625 lp = (struct i596_private *) dev->priv;
626 lp->scb.command = 0;
627
628 memcpy ((void *)lp->i596_config, init_setup, 14);
629 lp->set_conf.command = CmdConfigure;
630 i596_add_cmd(dev, (void *)&lp->set_conf);
631
632 memcpy ((void *)lp->eth_addr, dev->dev_addr, 6);
633 lp->set_add.command = CmdIASetup;
634 i596_add_cmd(dev, (struct i596_cmd *)&lp->set_add);
635
636 lp->tdr.command = CmdTDR;
637 i596_add_cmd(dev, (struct i596_cmd *)&lp->tdr);
638
639 if (lp->scb.command && i596_timeout(dev, "i82596 init", 200))
640 return 1;
641
642 lp->scb.command = RX_START;
643 CA();
644
645 barrier();
646
647 if (lp->scb.command && i596_timeout(dev, "Receive Unit start", 100))
648 return 1;
649
650 return 0;
651 }
652
653 /* Receive a single frame */
654 static inline int
655 i596_rx_one(struct net_device *dev, struct i596_private *lp,
656 struct i596_rfd *rfd, int *frames) {
657
658 if (rfd->stat & RFD_STAT_OK) {
659 /* a good frame */
660 int pkt_len = (rfd->count & 0x3fff);
661 struct sk_buff *skb = dev_alloc_skb(pkt_len);
662
663 (*frames)++;
664
665 if (rfd->cmd & CMD_EOL)
666 printk("Received on EOL\n");
667
668 if (skb == NULL) {
669 printk ("%s: i596_rx Memory squeeze, "
670 "dropping packet.\n", dev->name);
671 dev->stats.rx_dropped++;
672 return 1;
673 }
674
675 memcpy(skb_put(skb,pkt_len), rfd->data, pkt_len);
676
677 skb->protocol = eth_type_trans(skb,dev);
678 netif_rx(skb);
679 dev->last_rx = jiffies;
680 dev->stats.rx_packets++;
681 } else {
682 #if 0
683 printk("Frame reception error status %04x\n",
684 rfd->stat);
685 #endif
686 dev->stats.rx_errors++;
687 if (rfd->stat & RFD_COLLISION)
688 dev->stats.collisions++;
689 if (rfd->stat & RFD_SHORT_FRAME_ERR)
690 dev->stats.rx_length_errors++;
691 if (rfd->stat & RFD_DMA_ERR)
692 dev->stats.rx_over_errors++;
693 if (rfd->stat & RFD_NOBUFS_ERR)
694 dev->stats.rx_fifo_errors++;
695 if (rfd->stat & RFD_ALIGN_ERR)
696 dev->stats.rx_frame_errors++;
697 if (rfd->stat & RFD_CRC_ERR)
698 dev->stats.rx_crc_errors++;
699 if (rfd->stat & RFD_LENGTH_ERR)
700 dev->stats.rx_length_errors++;
701 }
702 rfd->stat = rfd->count = 0;
703 return 0;
704 }
705
706 static int
707 i596_rx(struct net_device *dev) {
708 struct i596_private *lp = (struct i596_private *) dev->priv;
709 struct i596_rfd *rfd;
710 int frames = 0;
711
712 while (1) {
713 rfd = pa_to_va(lp->scb.pa_rfd);
714 if (!rfd) {
715 printk(KERN_ERR "i596_rx: NULL rfd?\n");
716 return 0;
717 }
718 #if 1
719 if (rfd->stat && !(rfd->stat & (RFD_STAT_C | RFD_STAT_B)))
720 printk("SF:%p-%04x\n", rfd, rfd->stat);
721 #endif
722 if (!(rfd->stat & RFD_STAT_C))
723 break; /* next one not ready */
724 if (i596_rx_one(dev, lp, rfd, &frames))
725 break; /* out of memory */
726 rfd->cmd = CMD_EOL;
727 lp->rx_tail->cmd = 0;
728 lp->rx_tail = rfd;
729 lp->scb.pa_rfd = rfd->pa_next;
730 barrier();
731 }
732
733 return frames;
734 }
735
736 static void
737 i596_cleanup_cmd(struct net_device *dev) {
738 struct i596_private *lp;
739 struct i596_cmd *cmd;
740
741 lp = (struct i596_private *) dev->priv;
742 while (lp->cmd_head) {
743 cmd = (struct i596_cmd *)lp->cmd_head;
744
745 lp->cmd_head = pa_to_va(lp->cmd_head->pa_next);
746 lp->cmd_backlog--;
747
748 switch ((cmd->command) & 0x7) {
749 case CmdTx: {
750 struct tx_cmd *tx_cmd = (struct tx_cmd *) cmd;
751 struct i596_tbd * tx_cmd_tbd;
752 tx_cmd_tbd = pa_to_va(tx_cmd->pa_tbd);
753
754 dev_kfree_skb_any(tx_cmd_tbd->skb);
755
756 dev->stats.tx_errors++;
757 dev->stats.tx_aborted_errors++;
758
759 cmd->pa_next = I596_NULL;
760 kfree((unsigned char *)tx_cmd);
761 netif_wake_queue(dev);
762 break;
763 }
764 case CmdMulticastList: {
765 // unsigned short count = *((unsigned short *) (ptr + 1));
766
767 cmd->pa_next = I596_NULL;
768 kfree((unsigned char *)cmd);
769 break;
770 }
771 default: {
772 cmd->pa_next = I596_NULL;
773 break;
774 }
775 }
776 barrier();
777 }
778
779 if (lp->scb.command && i596_timeout(dev, "i596_cleanup_cmd", 100))
780 ;
781
782 lp->scb.pa_cmd = va_to_pa(lp->cmd_head);
783 }
784
785 static void i596_reset(struct net_device *dev, struct i596_private *lp, int ioaddr) {
786
787 if (lp->scb.command && i596_timeout(dev, "i596_reset", 100))
788 ;
789
790 netif_stop_queue(dev);
791
792 lp->scb.command = CUC_ABORT | RX_ABORT;
793 CA();
794 barrier();
795
796 /* wait for shutdown */
797 if (lp->scb.command && i596_timeout(dev, "i596_reset(2)", 400))
798 ;
799
800 i596_cleanup_cmd(dev);
801 i596_rx(dev);
802
803 netif_start_queue(dev);
804 /*dev_kfree_skb(skb, FREE_WRITE);*/
805 init_i596(dev);
806 }
807
808 static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd) {
809 struct i596_private *lp = dev->priv;
810 int ioaddr = dev->base_addr;
811 unsigned long flags;
812
813 cmd->status = 0;
814 cmd->command |= (CMD_EOL | CMD_INTR);
815 cmd->pa_next = I596_NULL;
816
817 spin_lock_irqsave(&lp->cmd_lock, flags);
818
819 if (lp->cmd_head) {
820 lp->cmd_tail->pa_next = va_to_pa(cmd);
821 } else {
822 lp->cmd_head = cmd;
823 if (lp->scb.command && i596_timeout(dev, "i596_add_cmd", 100))
824 ;
825 lp->scb.pa_cmd = va_to_pa(cmd);
826 lp->scb.command = CUC_START;
827 CA();
828 }
829 lp->cmd_tail = cmd;
830 lp->cmd_backlog++;
831
832 lp->cmd_head = pa_to_va(lp->scb.pa_cmd);
833 spin_unlock_irqrestore(&lp->cmd_lock, flags);
834
835 if (lp->cmd_backlog > 16) {
836 int tickssofar = jiffies - lp->last_cmd;
837 if (tickssofar < HZ/4)
838 return;
839
840 printk(KERN_WARNING "%s: command unit timed out, status resetting.\n", dev->name);
841 i596_reset(dev, lp, ioaddr);
842 }
843 }
844
845 static int i596_open(struct net_device *dev)
846 {
847 int i;
848
849 i = request_irq(dev->irq, &i596_interrupt, IRQF_SHARED, dev->name, dev);
850 if (i) {
851 printk(KERN_ERR "%s: IRQ %d not free\n", dev->name, dev->irq);
852 return i;
853 }
854
855 if ((i = init_rx_bufs(dev, RX_RING_SIZE)) < RX_RING_SIZE)
856 printk(KERN_ERR "%s: only able to allocate %d receive buffers\n", dev->name, i);
857
858 if (i < 4) {
859 free_irq(dev->irq, dev);
860 return -EAGAIN;
861 }
862 netif_start_queue(dev);
863 init_i596(dev);
864 return 0; /* Always succeed */
865 }
866
867 static int i596_start_xmit (struct sk_buff *skb, struct net_device *dev) {
868 struct tx_cmd *tx_cmd;
869 short length;
870
871 length = skb->len;
872
873 if (length < ETH_ZLEN) {
874 if (skb_padto(skb, ETH_ZLEN))
875 return 0;
876 length = ETH_ZLEN;
877 }
878
879 dev->trans_start = jiffies;
880
881 tx_cmd = kmalloc((sizeof (struct tx_cmd) + sizeof (struct i596_tbd)), GFP_ATOMIC);
882 if (tx_cmd == NULL) {
883 printk(KERN_WARNING "%s: i596_xmit Memory squeeze, dropping packet.\n", dev->name);
884 dev->stats.tx_dropped++;
885 dev_kfree_skb (skb);
886 } else {
887 struct i596_tbd *tx_cmd_tbd;
888 tx_cmd_tbd = (struct i596_tbd *) (tx_cmd + 1);
889 tx_cmd->pa_tbd = va_to_pa (tx_cmd_tbd);
890 tx_cmd_tbd->pa_next = I596_NULL;
891
892 tx_cmd->cmd.command = (CMD_FLEX | CmdTx);
893
894 tx_cmd->pad = 0;
895 tx_cmd->size = 0;
896 tx_cmd_tbd->pad = 0;
897 tx_cmd_tbd->size = (EOF | length);
898
899 tx_cmd_tbd->pa_data = va_to_pa (skb->data);
900 tx_cmd_tbd->skb = skb;
901
902 if (i596_debug & LOG_SRCDST)
903 print_eth (skb->data);
904
905 i596_add_cmd (dev, (struct i596_cmd *) tx_cmd);
906
907 dev->stats.tx_packets++;
908 }
909
910 return 0;
911 }
912
913 static void
914 i596_tx_timeout (struct net_device *dev) {
915 struct i596_private *lp = dev->priv;
916 int ioaddr = dev->base_addr;
917
918 /* Transmitter timeout, serious problems. */
919 printk(KERN_WARNING "%s: transmit timed out, status resetting.\n", dev->name);
920 dev->stats.tx_errors++;
921
922 /* Try to restart the adaptor */
923 if (lp->last_restart == dev->stats.tx_packets) {
924 printk ("Resetting board.\n");
925
926 /* Shutdown and restart */
927 i596_reset (dev, lp, ioaddr);
928 } else {
929 /* Issue a channel attention signal */
930 printk ("Kicking board.\n");
931 lp->scb.command = (CUC_START | RX_START);
932 CA();
933 lp->last_restart = dev->stats.tx_packets;
934 }
935 netif_wake_queue(dev);
936 }
937
938 static void print_eth(char *add)
939 {
940 int i;
941
942 printk ("Dest ");
943 for (i = 0; i < 6; i++)
944 printk(" %2.2X", (unsigned char) add[i]);
945 printk ("\n");
946
947 printk ("Source");
948 for (i = 0; i < 6; i++)
949 printk(" %2.2X", (unsigned char) add[i+6]);
950 printk ("\n");
951
952 printk ("type %2.2X%2.2X\n",
953 (unsigned char) add[12], (unsigned char) add[13]);
954 }
955
956 static int __init lp486e_probe(struct net_device *dev) {
957 struct i596_private *lp;
958 unsigned char eth_addr[6] = { 0, 0xaa, 0, 0, 0, 0 };
959 unsigned char *bios;
960 int i, j;
961 int ret = -ENOMEM;
962 static int probed;
963
964 if (probed)
965 return -ENODEV;
966 probed++;
967
968 if (!request_region(IOADDR, LP486E_TOTAL_SIZE, DRV_NAME)) {
969 printk(KERN_ERR "lp486e: IO address 0x%x in use\n", IOADDR);
970 return -EBUSY;
971 }
972
973 lp = (struct i596_private *) dev->priv;
974 spin_lock_init(&lp->cmd_lock);
975
976 /*
977 * Do we really have this thing?
978 */
979 if (i596_scp_setup(dev)) {
980 ret = -ENODEV;
981 goto err_out_kfree;
982 }
983
984 dev->base_addr = IOADDR;
985 dev->irq = IRQ;
986
987
988 /*
989 * How do we find the ethernet address? I don't know.
990 * One possibility is to look at the EISA configuration area
991 * [0xe8000-0xe9fff]. This contains the ethernet address
992 * but not at a fixed address - things depend on setup options.
993 *
994 * If we find no address, or the wrong address, use
995 * ifconfig eth0 hw ether a1:a2:a3:a4:a5:a6
996 * with the value found in the BIOS setup.
997 */
998 bios = bus_to_virt(0xe8000);
999 for (j = 0; j < 0x2000; j++) {
1000 if (bios[j] == 0 && bios[j+1] == 0xaa && bios[j+2] == 0) {
1001 printk("%s: maybe address at BIOS 0x%x:",
1002 dev->name, 0xe8000+j);
1003 for (i = 0; i < 6; i++) {
1004 eth_addr[i] = bios[i+j];
1005 printk(" %2.2X", eth_addr[i]);
1006 }
1007 printk("\n");
1008 }
1009 }
1010
1011 printk("%s: lp486e 82596 at %#3lx, IRQ %d,",
1012 dev->name, dev->base_addr, dev->irq);
1013 for (i = 0; i < 6; i++)
1014 printk(" %2.2X", dev->dev_addr[i] = eth_addr[i]);
1015 printk("\n");
1016
1017 /* The LP486E-specific entries in the device structure. */
1018 dev->open = &i596_open;
1019 dev->stop = &i596_close;
1020 dev->hard_start_xmit = &i596_start_xmit;
1021 dev->set_multicast_list = &set_multicast_list;
1022 dev->watchdog_timeo = 5*HZ;
1023 dev->tx_timeout = i596_tx_timeout;
1024
1025 #if 0
1026 /* selftest reports 0x320925ae - don't know what that means */
1027 i596_port_do(dev, PORT_SELFTEST, "selftest");
1028 i596_port_do(dev, PORT_DUMP, "dump");
1029 #endif
1030 return 0;
1031
1032 err_out_kfree:
1033 release_region(IOADDR, LP486E_TOTAL_SIZE);
1034 return ret;
1035 }
1036
1037 static inline void
1038 i596_handle_CU_completion(struct net_device *dev,
1039 struct i596_private *lp,
1040 unsigned short status,
1041 unsigned short *ack_cmdp) {
1042 struct i596_cmd *cmd;
1043 int frames_out = 0;
1044 int commands_done = 0;
1045 int cmd_val;
1046 unsigned long flags;
1047
1048 spin_lock_irqsave(&lp->cmd_lock, flags);
1049 cmd = lp->cmd_head;
1050
1051 while (lp->cmd_head && (lp->cmd_head->status & CMD_STAT_C)) {
1052 cmd = lp->cmd_head;
1053
1054 lp->cmd_head = pa_to_va(lp->cmd_head->pa_next);
1055 lp->cmd_backlog--;
1056
1057 commands_done++;
1058 cmd_val = cmd->command & 0x7;
1059 #if 0
1060 printk("finished CU %s command (%d)\n",
1061 CUcmdnames[cmd_val], cmd_val);
1062 #endif
1063 switch (cmd_val) {
1064 case CmdTx:
1065 {
1066 struct tx_cmd *tx_cmd;
1067 struct i596_tbd *tx_cmd_tbd;
1068
1069 tx_cmd = (struct tx_cmd *) cmd;
1070 tx_cmd_tbd = pa_to_va(tx_cmd->pa_tbd);
1071
1072 frames_out++;
1073 if (cmd->status & CMD_STAT_OK) {
1074 if (i596_debug)
1075 print_eth(pa_to_va(tx_cmd_tbd->pa_data));
1076 } else {
1077 dev->stats.tx_errors++;
1078 if (i596_debug)
1079 printk("transmission failure:%04x\n",
1080 cmd->status);
1081 if (cmd->status & 0x0020)
1082 dev->stats.collisions++;
1083 if (!(cmd->status & 0x0040))
1084 dev->stats.tx_heartbeat_errors++;
1085 if (cmd->status & 0x0400)
1086 dev->stats.tx_carrier_errors++;
1087 if (cmd->status & 0x0800)
1088 dev->stats.collisions++;
1089 if (cmd->status & 0x1000)
1090 dev->stats.tx_aborted_errors++;
1091 }
1092 dev_kfree_skb_irq(tx_cmd_tbd->skb);
1093
1094 cmd->pa_next = I596_NULL;
1095 kfree((unsigned char *)tx_cmd);
1096 netif_wake_queue(dev);
1097 break;
1098 }
1099
1100 case CmdMulticastList:
1101 cmd->pa_next = I596_NULL;
1102 kfree((unsigned char *)cmd);
1103 break;
1104
1105 case CmdTDR:
1106 {
1107 unsigned long status = *((unsigned long *) (cmd + 1));
1108 if (status & 0x8000) {
1109 if (i596_debug)
1110 printk("%s: link ok.\n", dev->name);
1111 } else {
1112 if (status & 0x4000)
1113 printk("%s: Transceiver problem.\n",
1114 dev->name);
1115 if (status & 0x2000)
1116 printk("%s: Termination problem.\n",
1117 dev->name);
1118 if (status & 0x1000)
1119 printk("%s: Short circuit.\n",
1120 dev->name);
1121 printk("%s: Time %ld.\n",
1122 dev->name, status & 0x07ff);
1123 }
1124 }
1125 default:
1126 cmd->pa_next = I596_NULL;
1127 lp->last_cmd = jiffies;
1128
1129 }
1130 barrier();
1131 }
1132
1133 cmd = lp->cmd_head;
1134 while (cmd && (cmd != lp->cmd_tail)) {
1135 cmd->command &= 0x1fff;
1136 cmd = pa_to_va(cmd->pa_next);
1137 barrier();
1138 }
1139
1140 if (lp->cmd_head)
1141 *ack_cmdp |= CUC_START;
1142 lp->scb.pa_cmd = va_to_pa(lp->cmd_head);
1143 spin_unlock_irqrestore(&lp->cmd_lock, flags);
1144 }
1145
1146 static irqreturn_t
1147 i596_interrupt(int irq, void *dev_instance)
1148 {
1149 struct net_device *dev = dev_instance;
1150 struct i596_private *lp = dev->priv;
1151 unsigned short status, ack_cmd = 0;
1152 int frames_in = 0;
1153
1154 /*
1155 * The 82596 examines the command, performs the required action,
1156 * and then clears the SCB command word.
1157 */
1158 if (lp->scb.command && i596_timeout(dev, "interrupt", 40))
1159 ;
1160
1161 /*
1162 * The status word indicates the status of the 82596.
1163 * It is modified only by the 82596.
1164 *
1165 * [So, we must not clear it. I find often status 0xffff,
1166 * which is not one of the values allowed by the docs.]
1167 */
1168 status = lp->scb.status;
1169 #if 0
1170 if (i596_debug) {
1171 printk("%s: i596 interrupt, ", dev->name);
1172 i596_out_status(status);
1173 }
1174 #endif
1175 /* Impossible, but it happens - perhaps when we get
1176 a receive interrupt but scb.pa_rfd is I596_NULL. */
1177 if (status == 0xffff) {
1178 printk("%s: i596_interrupt: got status 0xffff\n", dev->name);
1179 goto out;
1180 }
1181
1182 ack_cmd = (status & STAT_ACK);
1183
1184 if (status & (STAT_CX | STAT_CNA))
1185 i596_handle_CU_completion(dev, lp, status, &ack_cmd);
1186
1187 if (status & (STAT_FR | STAT_RNR)) {
1188 /* Restart the receive unit when it got inactive somehow */
1189 if ((status & STAT_RNR) && netif_running(dev))
1190 ack_cmd |= RX_START;
1191
1192 if (status & STAT_FR) {
1193 frames_in = i596_rx(dev);
1194 if (!frames_in)
1195 printk("receive frame reported, but no frames\n");
1196 }
1197 }
1198
1199 /* acknowledge the interrupt */
1200 /*
1201 if ((lp->scb.pa_cmd != I596_NULL) && netif_running(dev))
1202 ack_cmd |= CUC_START;
1203 */
1204
1205 if (lp->scb.command && i596_timeout(dev, "i596 interrupt", 100))
1206 ;
1207
1208 lp->scb.command = ack_cmd;
1209
1210 CLEAR_INT();
1211 CA();
1212
1213 out:
1214 return IRQ_HANDLED;
1215 }
1216
1217 static int i596_close(struct net_device *dev) {
1218 struct i596_private *lp = dev->priv;
1219
1220 netif_stop_queue(dev);
1221
1222 if (i596_debug)
1223 printk("%s: Shutting down ethercard, status was %4.4x.\n",
1224 dev->name, lp->scb.status);
1225
1226 lp->scb.command = (CUC_ABORT | RX_ABORT);
1227 CA();
1228
1229 i596_cleanup_cmd(dev);
1230
1231 if (lp->scb.command && i596_timeout(dev, "i596_close", 200))
1232 ;
1233
1234 free_irq(dev->irq, dev);
1235 remove_rx_bufs(dev);
1236
1237 return 0;
1238 }
1239
1240 /*
1241 * Set or clear the multicast filter for this adaptor.
1242 */
1243
1244 static void set_multicast_list(struct net_device *dev) {
1245 struct i596_private *lp = dev->priv;
1246 struct i596_cmd *cmd;
1247
1248 if (i596_debug > 1)
1249 printk ("%s: set multicast list %d\n",
1250 dev->name, dev->mc_count);
1251
1252 if (dev->mc_count > 0) {
1253 struct dev_mc_list *dmi;
1254 char *cp;
1255 cmd = kmalloc(sizeof(struct i596_cmd)+2+dev->mc_count*6, GFP_ATOMIC);
1256 if (cmd == NULL) {
1257 printk (KERN_ERR "%s: set_multicast Memory squeeze.\n", dev->name);
1258 return;
1259 }
1260 cmd->command = CmdMulticastList;
1261 *((unsigned short *) (cmd + 1)) = dev->mc_count * 6;
1262 cp = ((char *)(cmd + 1))+2;
1263 for (dmi = dev->mc_list; dmi != NULL; dmi = dmi->next) {
1264 memcpy(cp, dmi,6);
1265 cp += 6;
1266 }
1267 if (i596_debug & LOG_SRCDST)
1268 print_eth (((char *)(cmd + 1)) + 2);
1269 i596_add_cmd(dev, cmd);
1270 } else {
1271 if (lp->set_conf.pa_next != I596_NULL) {
1272 return;
1273 }
1274 if (dev->mc_count == 0 && !(dev->flags & (IFF_PROMISC | IFF_ALLMULTI))) {
1275 if (dev->flags & IFF_ALLMULTI)
1276 dev->flags |= IFF_PROMISC;
1277 lp->i596_config[8] &= ~0x01;
1278 } else {
1279 lp->i596_config[8] |= 0x01;
1280 }
1281
1282 i596_add_cmd(dev, (struct i596_cmd *) &lp->set_conf);
1283 }
1284 }
1285
1286 MODULE_AUTHOR("Ard van Breemen <ard@cstmel.nl.eu.org>");
1287 MODULE_DESCRIPTION("Intel Panther onboard i82596 driver");
1288 MODULE_LICENSE("GPL");
1289
1290 static struct net_device *dev_lp486e;
1291 static int full_duplex;
1292 static int options;
1293 static int io = IOADDR;
1294 static int irq = IRQ;
1295
1296 module_param(debug, int, 0);
1297 //module_param(max_interrupt_work, int, 0);
1298 //module_param(reverse_probe, int, 0);
1299 //module_param(rx_copybreak, int, 0);
1300 module_param(options, int, 0);
1301 module_param(full_duplex, int, 0);
1302
1303 static int __init lp486e_init_module(void) {
1304 int err;
1305 struct net_device *dev = alloc_etherdev(sizeof(struct i596_private));
1306 if (!dev)
1307 return -ENOMEM;
1308
1309 dev->irq = irq;
1310 dev->base_addr = io;
1311 err = lp486e_probe(dev);
1312 if (err) {
1313 free_netdev(dev);
1314 return err;
1315 }
1316 err = register_netdev(dev);
1317 if (err) {
1318 release_region(dev->base_addr, LP486E_TOTAL_SIZE);
1319 free_netdev(dev);
1320 return err;
1321 }
1322 dev_lp486e = dev;
1323 full_duplex = 0;
1324 options = 0;
1325 return 0;
1326 }
1327
1328 static void __exit lp486e_cleanup_module(void) {
1329 unregister_netdev(dev_lp486e);
1330 release_region(dev_lp486e->base_addr, LP486E_TOTAL_SIZE);
1331 free_netdev(dev_lp486e);
1332 }
1333
1334 module_init(lp486e_init_module);
1335 module_exit(lp486e_cleanup_module);
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