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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / net / arm / ether1.c
blob3bb9e293e2efea6ba066b6ad61960002f89d1675
1 /*
2 * linux/drivers/acorn/net/ether1.c
3 *
4 * Copyright (C) 1996-2000 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Acorn ether1 driver (82586 chip) for Acorn machines
11 *
12 * We basically keep two queues in the cards memory - one for transmit
13 * and one for receive. Each has a head and a tail. The head is where
14 * we/the chip adds packets to be transmitted/received, and the tail
15 * is where the transmitter has got to/where the receiver will stop.
16 * Both of these queues are circular, and since the chip is running
17 * all the time, we have to be careful when we modify the pointers etc
18 * so that the buffer memory contents is valid all the time.
19 *
20 * Change log:
21 * 1.00 RMK Released
22 * 1.01 RMK 19/03/1996 Transfers the last odd byte onto/off of the card now.
23 * 1.02 RMK 25/05/1997 Added code to restart RU if it goes not ready
24 * 1.03 RMK 14/09/1997 Cleaned up the handling of a reset during the TX interrupt.
25 * Should prevent lockup.
26 * 1.04 RMK 17/09/1997 Added more info when initialsation of chip goes wrong.
27 * TDR now only reports failure when chip reports non-zero
28 * TDR time-distance.
29 * 1.05 RMK 31/12/1997 Removed calls to dev_tint for 2.1
30 * 1.06 RMK 10/02/2000 Updated for 2.3.43
31 * 1.07 RMK 13/05/2000 Updated for 2.3.99-pre8
32 */
33
34 #include <linux/module.h>
35 #include <linux/kernel.h>
36 #include <linux/types.h>
37 #include <linux/fcntl.h>
38 #include <linux/interrupt.h>
39 #include <linux/ioport.h>
40 #include <linux/in.h>
41 #include <linux/slab.h>
42 #include <linux/string.h>
43 #include <linux/errno.h>
44 #include <linux/device.h>
45 #include <linux/init.h>
46 #include <linux/netdevice.h>
47 #include <linux/etherdevice.h>
48 #include <linux/skbuff.h>
49 #include <linux/bitops.h>
50
51 #include <asm/system.h>
52 #include <asm/io.h>
53 #include <asm/dma.h>
54 #include <asm/ecard.h>
55
56 #define __ETHER1_C
57 #include "ether1.h"
58
59 static unsigned int net_debug = NET_DEBUG;
60
61 #define BUFFER_SIZE 0x10000
62 #define TX_AREA_START 0x00100
63 #define TX_AREA_END 0x05000
64 #define RX_AREA_START 0x05000
65 #define RX_AREA_END 0x0fc00
66
67 static int ether1_open(struct net_device *dev);
68 static int ether1_sendpacket(struct sk_buff *skb, struct net_device *dev);
69 static irqreturn_t ether1_interrupt(int irq, void *dev_id);
70 static int ether1_close(struct net_device *dev);
71 static struct net_device_stats *ether1_getstats(struct net_device *dev);
72 static void ether1_setmulticastlist(struct net_device *dev);
73 static void ether1_timeout(struct net_device *dev);
74
75 /* ------------------------------------------------------------------------- */
76
77 static char version[] __devinitdata = "ether1 ethernet driver (c) 2000 Russell King v1.07\n";
78
79 #define BUS_16 16
80 #define BUS_8 8
81
82 /* ------------------------------------------------------------------------- */
83
84 #define DISABLEIRQS 1
85 #define NORMALIRQS 0
86
87 #define ether1_readw(dev, addr, type, offset, svflgs) ether1_inw_p (dev, addr + (int)(&((type *)0)->offset), svflgs)
88 #define ether1_writew(dev, val, addr, type, offset, svflgs) ether1_outw_p (dev, val, addr + (int)(&((type *)0)->offset), svflgs)
89
90 static inline unsigned short
91 ether1_inw_p (struct net_device *dev, int addr, int svflgs)
92 {
93 unsigned long flags;
94 unsigned short ret;
95
96 if (svflgs)
97 local_irq_save (flags);
98
99 writeb(addr >> 12, REG_PAGE);
100 ret = readw(ETHER1_RAM + ((addr & 4095) << 1));
101 if (svflgs)
102 local_irq_restore (flags);
103 return ret;
104 }
105
106 static inline void
107 ether1_outw_p (struct net_device *dev, unsigned short val, int addr, int svflgs)
108 {
109 unsigned long flags;
110
111 if (svflgs)
112 local_irq_save (flags);
113
114 writeb(addr >> 12, REG_PAGE);
115 writew(val, ETHER1_RAM + ((addr & 4095) << 1));
116 if (svflgs)
117 local_irq_restore (flags);
118 }
119
120 /*
121 * Some inline assembler to allow fast transfers on to/off of the card.
122 * Since this driver depends on some features presented by the ARM
123 * specific architecture, and that you can't configure this driver
124 * without specifiing ARM mode, this is not a problem.
125 *
126 * This routine is essentially an optimised memcpy from the card's
127 * onboard RAM to kernel memory.
128 */
129 static void
130 ether1_writebuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
131 {
132 unsigned int page, thislen, offset;
133 void __iomem *addr;
134
135 offset = start & 4095;
136 page = start >> 12;
137 addr = ETHER1_RAM + (offset << 1);
138
139 if (offset + length > 4096)
140 thislen = 4096 - offset;
141 else
142 thislen = length;
143
144 do {
145 int used;
146
147 writeb(page, REG_PAGE);
148 length -= thislen;
149
150 __asm__ __volatile__(
151 "subs %3, %3, #2\n\
152 bmi 2f\n\
153 1: ldr %0, [%1], #2\n\
154 mov %0, %0, lsl #16\n\
155 orr %0, %0, %0, lsr #16\n\
156 str %0, [%2], #4\n\
157 subs %3, %3, #2\n\
158 bmi 2f\n\
159 ldr %0, [%1], #2\n\
160 mov %0, %0, lsl #16\n\
161 orr %0, %0, %0, lsr #16\n\
162 str %0, [%2], #4\n\
163 subs %3, %3, #2\n\
164 bmi 2f\n\
165 ldr %0, [%1], #2\n\
166 mov %0, %0, lsl #16\n\
167 orr %0, %0, %0, lsr #16\n\
168 str %0, [%2], #4\n\
169 subs %3, %3, #2\n\
170 bmi 2f\n\
171 ldr %0, [%1], #2\n\
172 mov %0, %0, lsl #16\n\
173 orr %0, %0, %0, lsr #16\n\
174 str %0, [%2], #4\n\
175 subs %3, %3, #2\n\
176 bpl 1b\n\
177 2: adds %3, %3, #1\n\
178 ldreqb %0, [%1]\n\
179 streqb %0, [%2]"
180 : "=&r" (used), "=&r" (data)
181 : "r" (addr), "r" (thislen), "1" (data));
182
183 addr = ETHER1_RAM;
184
185 thislen = length;
186 if (thislen > 4096)
187 thislen = 4096;
188 page++;
189 } while (thislen);
190 }
191
192 static void
193 ether1_readbuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
194 {
195 unsigned int page, thislen, offset;
196 void __iomem *addr;
197
198 offset = start & 4095;
199 page = start >> 12;
200 addr = ETHER1_RAM + (offset << 1);
201
202 if (offset + length > 4096)
203 thislen = 4096 - offset;
204 else
205 thislen = length;
206
207 do {
208 int used;
209
210 writeb(page, REG_PAGE);
211 length -= thislen;
212
213 __asm__ __volatile__(
214 "subs %3, %3, #2\n\
215 bmi 2f\n\
216 1: ldr %0, [%2], #4\n\
217 strb %0, [%1], #1\n\
218 mov %0, %0, lsr #8\n\
219 strb %0, [%1], #1\n\
220 subs %3, %3, #2\n\
221 bmi 2f\n\
222 ldr %0, [%2], #4\n\
223 strb %0, [%1], #1\n\
224 mov %0, %0, lsr #8\n\
225 strb %0, [%1], #1\n\
226 subs %3, %3, #2\n\
227 bmi 2f\n\
228 ldr %0, [%2], #4\n\
229 strb %0, [%1], #1\n\
230 mov %0, %0, lsr #8\n\
231 strb %0, [%1], #1\n\
232 subs %3, %3, #2\n\
233 bmi 2f\n\
234 ldr %0, [%2], #4\n\
235 strb %0, [%1], #1\n\
236 mov %0, %0, lsr #8\n\
237 strb %0, [%1], #1\n\
238 subs %3, %3, #2\n\
239 bpl 1b\n\
240 2: adds %3, %3, #1\n\
241 ldreqb %0, [%2]\n\
242 streqb %0, [%1]"
243 : "=&r" (used), "=&r" (data)
244 : "r" (addr), "r" (thislen), "1" (data));
245
246 addr = ETHER1_RAM;
247
248 thislen = length;
249 if (thislen > 4096)
250 thislen = 4096;
251 page++;
252 } while (thislen);
253 }
254
255 static int __devinit
256 ether1_ramtest(struct net_device *dev, unsigned char byte)
257 {
258 unsigned char *buffer = kmalloc (BUFFER_SIZE, GFP_KERNEL);
259 int i, ret = BUFFER_SIZE;
260 int max_errors = 15;
261 int bad = -1;
262 int bad_start = 0;
263
264 if (!buffer)
265 return 1;
266
267 memset (buffer, byte, BUFFER_SIZE);
268 ether1_writebuffer (dev, buffer, 0, BUFFER_SIZE);
269 memset (buffer, byte ^ 0xff, BUFFER_SIZE);
270 ether1_readbuffer (dev, buffer, 0, BUFFER_SIZE);
271
272 for (i = 0; i < BUFFER_SIZE; i++) {
273 if (buffer[i] != byte) {
274 if (max_errors >= 0 && bad != buffer[i]) {
275 if (bad != -1)
276 printk ("\n");
277 printk (KERN_CRIT "%s: RAM failed with (%02X instead of %02X) at 0x%04X",
278 dev->name, buffer[i], byte, i);
279 ret = -ENODEV;
280 max_errors --;
281 bad = buffer[i];
282 bad_start = i;
283 }
284 } else {
285 if (bad != -1) {
286 if (bad_start == i - 1)
287 printk ("\n");
288 else
289 printk (" - 0x%04X\n", i - 1);
290 bad = -1;
291 }
292 }
293 }
294
295 if (bad != -1)
296 printk (" - 0x%04X\n", BUFFER_SIZE);
297 kfree (buffer);
298
299 return ret;
300 }
301
302 static int
303 ether1_reset (struct net_device *dev)
304 {
305 writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);
306 return BUS_16;
307 }
308
309 static int __devinit
310 ether1_init_2(struct net_device *dev)
311 {
312 int i;
313 dev->mem_start = 0;
314
315 i = ether1_ramtest (dev, 0x5a);
316
317 if (i > 0)
318 i = ether1_ramtest (dev, 0x1e);
319
320 if (i <= 0)
321 return -ENODEV;
322
323 dev->mem_end = i;
324 return 0;
325 }
326
327 /*
328 * These are the structures that are loaded into the ether RAM card to
329 * initialise the 82586
330 */
331
332 /* at 0x0100 */
333 #define NOP_ADDR (TX_AREA_START)
334 #define NOP_SIZE (0x06)
335 static nop_t init_nop = {
336 0,
337 CMD_NOP,
338 NOP_ADDR
339 };
340
341 /* at 0x003a */
342 #define TDR_ADDR (0x003a)
343 #define TDR_SIZE (0x08)
344 static tdr_t init_tdr = {
345 0,
346 CMD_TDR | CMD_INTR,
347 NOP_ADDR,
348 0
349 };
350
351 /* at 0x002e */
352 #define MC_ADDR (0x002e)
353 #define MC_SIZE (0x0c)
354 static mc_t init_mc = {
355 0,
356 CMD_SETMULTICAST,
357 TDR_ADDR,
358 0,
359 { { 0, } }
360 };
361
362 /* at 0x0022 */
363 #define SA_ADDR (0x0022)
364 #define SA_SIZE (0x0c)
365 static sa_t init_sa = {
366 0,
367 CMD_SETADDRESS,
368 MC_ADDR,
369 { 0, }
370 };
371
372 /* at 0x0010 */
373 #define CFG_ADDR (0x0010)
374 #define CFG_SIZE (0x12)
375 static cfg_t init_cfg = {
376 0,
377 CMD_CONFIG,
378 SA_ADDR,
379 8,
380 8,
381 CFG8_SRDY,
382 CFG9_PREAMB8 | CFG9_ADDRLENBUF | CFG9_ADDRLEN(6),
383 0,
384 0x60,
385 0,
386 CFG13_RETRY(15) | CFG13_SLOTH(2),
387 0,
388 };
389
390 /* at 0x0000 */
391 #define SCB_ADDR (0x0000)
392 #define SCB_SIZE (0x10)
393 static scb_t init_scb = {
394 0,
395 SCB_CMDACKRNR | SCB_CMDACKCNA | SCB_CMDACKFR | SCB_CMDACKCX,
396 CFG_ADDR,
397 RX_AREA_START,
398 0,
399 0,
400 0,
401 0
402 };
403
404 /* at 0xffee */
405 #define ISCP_ADDR (0xffee)
406 #define ISCP_SIZE (0x08)
407 static iscp_t init_iscp = {
408 1,
409 SCB_ADDR,
410 0x0000,
411 0x0000
412 };
413
414 /* at 0xfff6 */
415 #define SCP_ADDR (0xfff6)
416 #define SCP_SIZE (0x0a)
417 static scp_t init_scp = {
418 SCP_SY_16BBUS,
419 { 0, 0 },
420 ISCP_ADDR,
421 0
422 };
423
424 #define RFD_SIZE (0x16)
425 static rfd_t init_rfd = {
426 0,
427 0,
428 0,
429 0,
430 { 0, },
431 { 0, },
432 0
433 };
434
435 #define RBD_SIZE (0x0a)
436 static rbd_t init_rbd = {
437 0,
438 0,
439 0,
440 0,
441 ETH_FRAME_LEN + 8
442 };
443
444 #define TX_SIZE (0x08)
445 #define TBD_SIZE (0x08)
446
447 static int
448 ether1_init_for_open (struct net_device *dev)
449 {
450 int i, status, addr, next, next2;
451 int failures = 0;
452 unsigned long timeout;
453
454 writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);
455
456 for (i = 0; i < 6; i++)
457 init_sa.sa_addr[i] = dev->dev_addr[i];
458
459 /* load data structures into ether1 RAM */
460 ether1_writebuffer (dev, &init_scp, SCP_ADDR, SCP_SIZE);
461 ether1_writebuffer (dev, &init_iscp, ISCP_ADDR, ISCP_SIZE);
462 ether1_writebuffer (dev, &init_scb, SCB_ADDR, SCB_SIZE);
463 ether1_writebuffer (dev, &init_cfg, CFG_ADDR, CFG_SIZE);
464 ether1_writebuffer (dev, &init_sa, SA_ADDR, SA_SIZE);
465 ether1_writebuffer (dev, &init_mc, MC_ADDR, MC_SIZE);
466 ether1_writebuffer (dev, &init_tdr, TDR_ADDR, TDR_SIZE);
467 ether1_writebuffer (dev, &init_nop, NOP_ADDR, NOP_SIZE);
468
469 if (ether1_readw(dev, CFG_ADDR, cfg_t, cfg_command, NORMALIRQS) != CMD_CONFIG) {
470 printk (KERN_ERR "%s: detected either RAM fault or compiler bug\n",
471 dev->name);
472 return 1;
473 }
474
475 /*
476 * setup circularly linked list of { rfd, rbd, buffer }, with
477 * all rfds circularly linked, rbds circularly linked.
478 * First rfd is linked to scp, first rbd is linked to first
479 * rfd. Last rbd has a suspend command.
480 */
481 addr = RX_AREA_START;
482 do {
483 next = addr + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;
484 next2 = next + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;
485
486 if (next2 >= RX_AREA_END) {
487 next = RX_AREA_START;
488 init_rfd.rfd_command = RFD_CMDEL | RFD_CMDSUSPEND;
489 priv(dev)->rx_tail = addr;
490 } else
491 init_rfd.rfd_command = 0;
492 if (addr == RX_AREA_START)
493 init_rfd.rfd_rbdoffset = addr + RFD_SIZE;
494 else
495 init_rfd.rfd_rbdoffset = 0;
496 init_rfd.rfd_link = next;
497 init_rbd.rbd_link = next + RFD_SIZE;
498 init_rbd.rbd_bufl = addr + RFD_SIZE + RBD_SIZE;
499
500 ether1_writebuffer (dev, &init_rfd, addr, RFD_SIZE);
501 ether1_writebuffer (dev, &init_rbd, addr + RFD_SIZE, RBD_SIZE);
502 addr = next;
503 } while (next2 < RX_AREA_END);
504
505 priv(dev)->tx_link = NOP_ADDR;
506 priv(dev)->tx_head = NOP_ADDR + NOP_SIZE;
507 priv(dev)->tx_tail = TDR_ADDR;
508 priv(dev)->rx_head = RX_AREA_START;
509
510 /* release reset & give 586 a prod */
511 priv(dev)->resetting = 1;
512 priv(dev)->initialising = 1;
513 writeb(CTRL_RST, REG_CONTROL);
514 writeb(0, REG_CONTROL);
515 writeb(CTRL_CA, REG_CONTROL);
516
517 /* 586 should now unset iscp.busy */
518 timeout = jiffies + HZ/2;
519 while (ether1_readw(dev, ISCP_ADDR, iscp_t, iscp_busy, DISABLEIRQS) == 1) {
520 if (time_after(jiffies, timeout)) {
521 printk (KERN_WARNING "%s: can't initialise 82586: iscp is busy\n", dev->name);
522 return 1;
523 }
524 }
525
526 /* check status of commands that we issued */
527 timeout += HZ/10;
528 while (((status = ether1_readw(dev, CFG_ADDR, cfg_t, cfg_status, DISABLEIRQS))
529 & STAT_COMPLETE) == 0) {
530 if (time_after(jiffies, timeout))
531 break;
532 }
533
534 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
535 printk (KERN_WARNING "%s: can't initialise 82586: config status %04X\n", dev->name, status);
536 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
537 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
538 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
539 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
540 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
541 failures += 1;
542 }
543
544 timeout += HZ/10;
545 while (((status = ether1_readw(dev, SA_ADDR, sa_t, sa_status, DISABLEIRQS))
546 & STAT_COMPLETE) == 0) {
547 if (time_after(jiffies, timeout))
548 break;
549 }
550
551 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
552 printk (KERN_WARNING "%s: can't initialise 82586: set address status %04X\n", dev->name, status);
553 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
554 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
555 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
556 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
557 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
558 failures += 1;
559 }
560
561 timeout += HZ/10;
562 while (((status = ether1_readw(dev, MC_ADDR, mc_t, mc_status, DISABLEIRQS))
563 & STAT_COMPLETE) == 0) {
564 if (time_after(jiffies, timeout))
565 break;
566 }
567
568 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
569 printk (KERN_WARNING "%s: can't initialise 82586: set multicast status %04X\n", dev->name, status);
570 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
571 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
572 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
573 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
574 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
575 failures += 1;
576 }
577
578 timeout += HZ;
579 while (((status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_status, DISABLEIRQS))
580 & STAT_COMPLETE) == 0) {
581 if (time_after(jiffies, timeout))
582 break;
583 }
584
585 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
586 printk (KERN_WARNING "%s: can't tdr (ignored)\n", dev->name);
587 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
588 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
589 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
590 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
591 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
592 } else {
593 status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_result, DISABLEIRQS);
594 if (status & TDR_XCVRPROB)
595 printk (KERN_WARNING "%s: i/f failed tdr: transceiver problem\n", dev->name);
596 else if ((status & (TDR_SHORT|TDR_OPEN)) && (status & TDR_TIME)) {
597 #ifdef FANCY
598 printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d.%d us away\n", dev->name,
599 status & TDR_SHORT ? "short" : "open", (status & TDR_TIME) / 10,
600 (status & TDR_TIME) % 10);
601 #else
602 printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d clks away\n", dev->name,
603 status & TDR_SHORT ? "short" : "open", (status & TDR_TIME));
604 #endif
605 }
606 }
607
608 if (failures)
609 ether1_reset (dev);
610 return failures ? 1 : 0;
611 }
612
613 /* ------------------------------------------------------------------------- */
614
615 static int
616 ether1_txalloc (struct net_device *dev, int size)
617 {
618 int start, tail;
619
620 size = (size + 1) & ~1;
621 tail = priv(dev)->tx_tail;
622
623 if (priv(dev)->tx_head + size > TX_AREA_END) {
624 if (tail > priv(dev)->tx_head)
625 return -1;
626 start = TX_AREA_START;
627 if (start + size > tail)
628 return -1;
629 priv(dev)->tx_head = start + size;
630 } else {
631 if (priv(dev)->tx_head < tail && (priv(dev)->tx_head + size) > tail)
632 return -1;
633 start = priv(dev)->tx_head;
634 priv(dev)->tx_head += size;
635 }
636
637 return start;
638 }
639
640 static int
641 ether1_open (struct net_device *dev)
642 {
643 if (!is_valid_ether_addr(dev->dev_addr)) {
644 printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
645 dev->name);
646 return -EINVAL;
647 }
648
649 if (request_irq(dev->irq, ether1_interrupt, 0, "ether1", dev))
650 return -EAGAIN;
651
652 memset (&priv(dev)->stats, 0, sizeof (struct net_device_stats));
653
654 if (ether1_init_for_open (dev)) {
655 free_irq (dev->irq, dev);
656 return -EAGAIN;
657 }
658
659 netif_start_queue(dev);
660
661 return 0;
662 }
663
664 static void
665 ether1_timeout(struct net_device *dev)
666 {
667 printk(KERN_WARNING "%s: transmit timeout, network cable problem?\n",
668 dev->name);
669 printk(KERN_WARNING "%s: resetting device\n", dev->name);
670
671 ether1_reset (dev);
672
673 if (ether1_init_for_open (dev))
674 printk (KERN_ERR "%s: unable to restart interface\n", dev->name);
675
676 priv(dev)->stats.tx_errors++;
677 netif_wake_queue(dev);
678 }
679
680 static int
681 ether1_sendpacket (struct sk_buff *skb, struct net_device *dev)
682 {
683 int tmp, tst, nopaddr, txaddr, tbdaddr, dataddr;
684 unsigned long flags;
685 tx_t tx;
686 tbd_t tbd;
687 nop_t nop;
688
689 if (priv(dev)->restart) {
690 printk(KERN_WARNING "%s: resetting device\n", dev->name);
691
692 ether1_reset(dev);
693
694 if (ether1_init_for_open(dev))
695 printk(KERN_ERR "%s: unable to restart interface\n", dev->name);
696 else
697 priv(dev)->restart = 0;
698 }
699
700 if (skb->len < ETH_ZLEN) {
701 if (skb_padto(skb, ETH_ZLEN))
702 goto out;
703 }
704
705 /*
706 * insert packet followed by a nop
707 */
708 txaddr = ether1_txalloc (dev, TX_SIZE);
709 tbdaddr = ether1_txalloc (dev, TBD_SIZE);
710 dataddr = ether1_txalloc (dev, skb->len);
711 nopaddr = ether1_txalloc (dev, NOP_SIZE);
712
713 tx.tx_status = 0;
714 tx.tx_command = CMD_TX | CMD_INTR;
715 tx.tx_link = nopaddr;
716 tx.tx_tbdoffset = tbdaddr;
717 tbd.tbd_opts = TBD_EOL | skb->len;
718 tbd.tbd_link = I82586_NULL;
719 tbd.tbd_bufl = dataddr;
720 tbd.tbd_bufh = 0;
721 nop.nop_status = 0;
722 nop.nop_command = CMD_NOP;
723 nop.nop_link = nopaddr;
724
725 local_irq_save(flags);
726 ether1_writebuffer (dev, &tx, txaddr, TX_SIZE);
727 ether1_writebuffer (dev, &tbd, tbdaddr, TBD_SIZE);
728 ether1_writebuffer (dev, skb->data, dataddr, skb->len);
729 ether1_writebuffer (dev, &nop, nopaddr, NOP_SIZE);
730 tmp = priv(dev)->tx_link;
731 priv(dev)->tx_link = nopaddr;
732
733 /* now reset the previous nop pointer */
734 ether1_writew(dev, txaddr, tmp, nop_t, nop_link, NORMALIRQS);
735
736 local_irq_restore(flags);
737
738 /* handle transmit */
739 dev->trans_start = jiffies;
740
741 /* check to see if we have room for a full sized ether frame */
742 tmp = priv(dev)->tx_head;
743 tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
744 priv(dev)->tx_head = tmp;
745 dev_kfree_skb (skb);
746
747 if (tst == -1)
748 netif_stop_queue(dev);
749
750 out:
751 return 0;
752 }
753
754 static void
755 ether1_xmit_done (struct net_device *dev)
756 {
757 nop_t nop;
758 int caddr, tst;
759
760 caddr = priv(dev)->tx_tail;
761
762 again:
763 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
764
765 switch (nop.nop_command & CMD_MASK) {
766 case CMD_TDR:
767 /* special case */
768 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
769 != (unsigned short)I82586_NULL) {
770 ether1_writew(dev, SCB_CMDCUCSTART | SCB_CMDRXSTART, SCB_ADDR, scb_t,
771 scb_command, NORMALIRQS);
772 writeb(CTRL_CA, REG_CONTROL);
773 }
774 priv(dev)->tx_tail = NOP_ADDR;
775 return;
776
777 case CMD_NOP:
778 if (nop.nop_link == caddr) {
779 if (priv(dev)->initialising == 0)
780 printk (KERN_WARNING "%s: strange command complete with no tx command!\n", dev->name);
781 else
782 priv(dev)->initialising = 0;
783 return;
784 }
785 if (caddr == nop.nop_link)
786 return;
787 caddr = nop.nop_link;
788 goto again;
789
790 case CMD_TX:
791 if (nop.nop_status & STAT_COMPLETE)
792 break;
793 printk (KERN_ERR "%s: strange command complete without completed command\n", dev->name);
794 priv(dev)->restart = 1;
795 return;
796
797 default:
798 printk (KERN_WARNING "%s: strange command %d complete! (offset %04X)", dev->name,
799 nop.nop_command & CMD_MASK, caddr);
800 priv(dev)->restart = 1;
801 return;
802 }
803
804 while (nop.nop_status & STAT_COMPLETE) {
805 if (nop.nop_status & STAT_OK) {
806 priv(dev)->stats.tx_packets ++;
807 priv(dev)->stats.collisions += (nop.nop_status & STAT_COLLISIONS);
808 } else {
809 priv(dev)->stats.tx_errors ++;
810
811 if (nop.nop_status & STAT_COLLAFTERTX)
812 priv(dev)->stats.collisions ++;
813 if (nop.nop_status & STAT_NOCARRIER)
814 priv(dev)->stats.tx_carrier_errors ++;
815 if (nop.nop_status & STAT_TXLOSTCTS)
816 printk (KERN_WARNING "%s: cts lost\n", dev->name);
817 if (nop.nop_status & STAT_TXSLOWDMA)
818 priv(dev)->stats.tx_fifo_errors ++;
819 if (nop.nop_status & STAT_COLLEXCESSIVE)
820 priv(dev)->stats.collisions += 16;
821 }
822
823 if (nop.nop_link == caddr) {
824 printk (KERN_ERR "%s: tx buffer chaining error: tx command points to itself\n", dev->name);
825 break;
826 }
827
828 caddr = nop.nop_link;
829 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
830 if ((nop.nop_command & CMD_MASK) != CMD_NOP) {
831 printk (KERN_ERR "%s: tx buffer chaining error: no nop after tx command\n", dev->name);
832 break;
833 }
834
835 if (caddr == nop.nop_link)
836 break;
837
838 caddr = nop.nop_link;
839 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
840 if ((nop.nop_command & CMD_MASK) != CMD_TX) {
841 printk (KERN_ERR "%s: tx buffer chaining error: no tx command after nop\n", dev->name);
842 break;
843 }
844 }
845 priv(dev)->tx_tail = caddr;
846
847 caddr = priv(dev)->tx_head;
848 tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
849 priv(dev)->tx_head = caddr;
850 if (tst != -1)
851 netif_wake_queue(dev);
852 }
853
854 static void
855 ether1_recv_done (struct net_device *dev)
856 {
857 int status;
858 int nexttail, rbdaddr;
859 rbd_t rbd;
860
861 do {
862 status = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_status, NORMALIRQS);
863 if ((status & RFD_COMPLETE) == 0)
864 break;
865
866 rbdaddr = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_rbdoffset, NORMALIRQS);
867 ether1_readbuffer (dev, &rbd, rbdaddr, RBD_SIZE);
868
869 if ((rbd.rbd_status & (RBD_EOF | RBD_ACNTVALID)) == (RBD_EOF | RBD_ACNTVALID)) {
870 int length = rbd.rbd_status & RBD_ACNT;
871 struct sk_buff *skb;
872
873 length = (length + 1) & ~1;
874 skb = dev_alloc_skb (length + 2);
875
876 if (skb) {
877 skb_reserve (skb, 2);
878
879 ether1_readbuffer (dev, skb_put (skb, length), rbd.rbd_bufl, length);
880
881 skb->protocol = eth_type_trans (skb, dev);
882 netif_rx (skb);
883 priv(dev)->stats.rx_packets ++;
884 } else
885 priv(dev)->stats.rx_dropped ++;
886 } else {
887 printk(KERN_WARNING "%s: %s\n", dev->name,
888 (rbd.rbd_status & RBD_EOF) ? "oversized packet" : "acnt not valid");
889 priv(dev)->stats.rx_dropped ++;
890 }
891
892 nexttail = ether1_readw(dev, priv(dev)->rx_tail, rfd_t, rfd_link, NORMALIRQS);
893 /* nexttail should be rx_head */
894 if (nexttail != priv(dev)->rx_head)
895 printk(KERN_ERR "%s: receiver buffer chaining error (%04X != %04X)\n",
896 dev->name, nexttail, priv(dev)->rx_head);
897 ether1_writew(dev, RFD_CMDEL | RFD_CMDSUSPEND, nexttail, rfd_t, rfd_command, NORMALIRQS);
898 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_command, NORMALIRQS);
899 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_status, NORMALIRQS);
900 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_rbdoffset, NORMALIRQS);
901
902 priv(dev)->rx_tail = nexttail;
903 priv(dev)->rx_head = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_link, NORMALIRQS);
904 } while (1);
905 }
906
907 static irqreturn_t
908 ether1_interrupt (int irq, void *dev_id)
909 {
910 struct net_device *dev = (struct net_device *)dev_id;
911 int status;
912
913 status = ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS);
914
915 if (status) {
916 ether1_writew(dev, status & (SCB_STRNR | SCB_STCNA | SCB_STFR | SCB_STCX),
917 SCB_ADDR, scb_t, scb_command, NORMALIRQS);
918 writeb(CTRL_CA | CTRL_ACK, REG_CONTROL);
919 if (status & SCB_STCX) {
920 ether1_xmit_done (dev);
921 }
922 if (status & SCB_STCNA) {
923 if (priv(dev)->resetting == 0)
924 printk (KERN_WARNING "%s: CU went not ready ???\n", dev->name);
925 else
926 priv(dev)->resetting += 1;
927 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
928 != (unsigned short)I82586_NULL) {
929 ether1_writew(dev, SCB_CMDCUCSTART, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
930 writeb(CTRL_CA, REG_CONTROL);
931 }
932 if (priv(dev)->resetting == 2)
933 priv(dev)->resetting = 0;
934 }
935 if (status & SCB_STFR) {
936 ether1_recv_done (dev);
937 }
938 if (status & SCB_STRNR) {
939 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS) & SCB_STRXSUSP) {
940 printk (KERN_WARNING "%s: RU went not ready: RU suspended\n", dev->name);
941 ether1_writew(dev, SCB_CMDRXRESUME, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
942 writeb(CTRL_CA, REG_CONTROL);
943 priv(dev)->stats.rx_dropped ++; /* we suspended due to lack of buffer space */
944 } else
945 printk(KERN_WARNING "%s: RU went not ready: %04X\n", dev->name,
946 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS));
947 printk (KERN_WARNING "RU ptr = %04X\n", ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset,
948 NORMALIRQS));
949 }
950 } else
951 writeb(CTRL_ACK, REG_CONTROL);
952
953 return IRQ_HANDLED;
954 }
955
956 static int
957 ether1_close (struct net_device *dev)
958 {
959 ether1_reset (dev);
960
961 free_irq(dev->irq, dev);
962
963 return 0;
964 }
965
966 static struct net_device_stats *
967 ether1_getstats (struct net_device *dev)
968 {
969 return &priv(dev)->stats;
970 }
971
972 /*
973 * Set or clear the multicast filter for this adaptor.
974 * num_addrs == -1 Promiscuous mode, receive all packets.
975 * num_addrs == 0 Normal mode, clear multicast list.
976 * num_addrs > 0 Multicast mode, receive normal and MC packets, and do
977 * best-effort filtering.
978 */
979 static void
980 ether1_setmulticastlist (struct net_device *dev)
981 {
982 }
983
984 /* ------------------------------------------------------------------------- */
985
986 static void __devinit ether1_banner(void)
987 {
988 static unsigned int version_printed = 0;
989
990 if (net_debug && version_printed++ == 0)
991 printk(KERN_INFO "%s", version);
992 }
993
994 static int __devinit
995 ether1_probe(struct expansion_card *ec, const struct ecard_id *id)
996 {
997 struct net_device *dev;
998 int i, ret = 0;
999 DECLARE_MAC_BUF(mac);
1000
1001 ether1_banner();
1002
1003 ret = ecard_request_resources(ec);
1004 if (ret)
1005 goto out;
1006
1007 dev = alloc_etherdev(sizeof(struct ether1_priv));
1008 if (!dev) {
1009 ret = -ENOMEM;
1010 goto release;
1011 }
1012
1013 SET_NETDEV_DEV(dev, &ec->dev);
1014
1015 dev->irq = ec->irq;
1016 priv(dev)->base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
1017 if (!priv(dev)->base) {
1018 ret = -ENOMEM;
1019 goto free;
1020 }
1021
1022 if ((priv(dev)->bus_type = ether1_reset(dev)) == 0) {
1023 ret = -ENODEV;
1024 goto free;
1025 }
1026
1027 for (i = 0; i < 6; i++)
1028 dev->dev_addr[i] = readb(IDPROM_ADDRESS + (i << 2));
1029
1030 if (ether1_init_2(dev)) {
1031 ret = -ENODEV;
1032 goto free;
1033 }
1034
1035 dev->open = ether1_open;
1036 dev->stop = ether1_close;
1037 dev->hard_start_xmit = ether1_sendpacket;
1038 dev->get_stats = ether1_getstats;
1039 dev->set_multicast_list = ether1_setmulticastlist;
1040 dev->tx_timeout = ether1_timeout;
1041 dev->watchdog_timeo = 5 * HZ / 100;
1042
1043 ret = register_netdev(dev);
1044 if (ret)
1045 goto free;
1046
1047 printk(KERN_INFO "%s: ether1 in slot %d, %s\n",
1048 dev->name, ec->slot_no, print_mac(mac, dev->dev_addr));
1049
1050 ecard_set_drvdata(ec, dev);
1051 return 0;
1052
1053 free:
1054 free_netdev(dev);
1055 release:
1056 ecard_release_resources(ec);
1057 out:
1058 return ret;
1059 }
1060
1061 static void __devexit ether1_remove(struct expansion_card *ec)
1062 {
1063 struct net_device *dev = ecard_get_drvdata(ec);
1064
1065 ecard_set_drvdata(ec, NULL);
1066
1067 unregister_netdev(dev);
1068 free_netdev(dev);
1069 ecard_release_resources(ec);
1070 }
1071
1072 static const struct ecard_id ether1_ids[] = {
1073 { MANU_ACORN, PROD_ACORN_ETHER1 },
1074 { 0xffff, 0xffff }
1075 };
1076
1077 static struct ecard_driver ether1_driver = {
1078 .probe = ether1_probe,
1079 .remove = __devexit_p(ether1_remove),
1080 .id_table = ether1_ids,
1081 .drv = {
1082 .name = "ether1",
1083 },
1084 };
1085
1086 static int __init ether1_init(void)
1087 {
1088 return ecard_register_driver(&ether1_driver);
1089 }
1090
1091 static void __exit ether1_exit(void)
1092 {
1093 ecard_remove_driver(&ether1_driver);
1094 }
1095
1096 module_init(ether1_init);
1097 module_exit(ether1_exit);
1098
1099 MODULE_LICENSE("GPL");
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