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kbuild: document howto build external modules using several directories
[linux-2.6/verdex.git] / drivers / net / arm / ether1.c
blob36475eb2727f6ae10e5b1617951b83e1910ea25a
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/sched.h>
37 #include <linux/types.h>
38 #include <linux/fcntl.h>
39 #include <linux/interrupt.h>
40 #include <linux/ptrace.h>
41 #include <linux/ioport.h>
42 #include <linux/in.h>
43 #include <linux/slab.h>
44 #include <linux/string.h>
45 #include <linux/errno.h>
46 #include <linux/device.h>
47 #include <linux/init.h>
48 #include <linux/netdevice.h>
49 #include <linux/etherdevice.h>
50 #include <linux/skbuff.h>
51 #include <linux/bitops.h>
52
53 #include <asm/system.h>
54 #include <asm/io.h>
55 #include <asm/dma.h>
56 #include <asm/ecard.h>
57
58 #define __ETHER1_C
59 #include "ether1.h"
60
61 static unsigned int net_debug = NET_DEBUG;
62
63 #define BUFFER_SIZE 0x10000
64 #define TX_AREA_START 0x00100
65 #define TX_AREA_END 0x05000
66 #define RX_AREA_START 0x05000
67 #define RX_AREA_END 0x0fc00
68
69 static int ether1_open(struct net_device *dev);
70 static int ether1_sendpacket(struct sk_buff *skb, struct net_device *dev);
71 static irqreturn_t ether1_interrupt(int irq, void *dev_id, struct pt_regs *regs);
72 static int ether1_close(struct net_device *dev);
73 static struct net_device_stats *ether1_getstats(struct net_device *dev);
74 static void ether1_setmulticastlist(struct net_device *dev);
75 static void ether1_timeout(struct net_device *dev);
76
77 /* ------------------------------------------------------------------------- */
78
79 static char version[] __initdata = "ether1 ethernet driver (c) 2000 Russell King v1.07\n";
80
81 #define BUS_16 16
82 #define BUS_8 8
83
84 /* ------------------------------------------------------------------------- */
85
86 #define DISABLEIRQS 1
87 #define NORMALIRQS 0
88
89 #define ether1_readw(dev, addr, type, offset, svflgs) ether1_inw_p (dev, addr + (int)(&((type *)0)->offset), svflgs)
90 #define ether1_writew(dev, val, addr, type, offset, svflgs) ether1_outw_p (dev, val, addr + (int)(&((type *)0)->offset), svflgs)
91
92 static inline unsigned short
93 ether1_inw_p (struct net_device *dev, int addr, int svflgs)
94 {
95 unsigned long flags;
96 unsigned short ret;
97
98 if (svflgs)
99 local_irq_save (flags);
100
101 writeb(addr >> 12, REG_PAGE);
102 ret = readw(ETHER1_RAM + ((addr & 4095) << 1));
103 if (svflgs)
104 local_irq_restore (flags);
105 return ret;
106 }
107
108 static inline void
109 ether1_outw_p (struct net_device *dev, unsigned short val, int addr, int svflgs)
110 {
111 unsigned long flags;
112
113 if (svflgs)
114 local_irq_save (flags);
115
116 writeb(addr >> 12, REG_PAGE);
117 writew(val, ETHER1_RAM + ((addr & 4095) << 1));
118 if (svflgs)
119 local_irq_restore (flags);
120 }
121
122 /*
123 * Some inline assembler to allow fast transfers on to/off of the card.
124 * Since this driver depends on some features presented by the ARM
125 * specific architecture, and that you can't configure this driver
126 * without specifiing ARM mode, this is not a problem.
127 *
128 * This routine is essentially an optimised memcpy from the card's
129 * onboard RAM to kernel memory.
130 */
131 static void
132 ether1_writebuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
133 {
134 unsigned int page, thislen, offset;
135 void __iomem *addr;
136
137 offset = start & 4095;
138 page = start >> 12;
139 addr = ETHER1_RAM + (offset << 1);
140
141 if (offset + length > 4096)
142 thislen = 4096 - offset;
143 else
144 thislen = length;
145
146 do {
147 int used;
148
149 writeb(page, REG_PAGE);
150 length -= thislen;
151
152 __asm__ __volatile__(
153 "subs %3, %3, #2\n\
154 bmi 2f\n\
155 1: ldr %0, [%1], #2\n\
156 mov %0, %0, lsl #16\n\
157 orr %0, %0, %0, lsr #16\n\
158 str %0, [%2], #4\n\
159 subs %3, %3, #2\n\
160 bmi 2f\n\
161 ldr %0, [%1], #2\n\
162 mov %0, %0, lsl #16\n\
163 orr %0, %0, %0, lsr #16\n\
164 str %0, [%2], #4\n\
165 subs %3, %3, #2\n\
166 bmi 2f\n\
167 ldr %0, [%1], #2\n\
168 mov %0, %0, lsl #16\n\
169 orr %0, %0, %0, lsr #16\n\
170 str %0, [%2], #4\n\
171 subs %3, %3, #2\n\
172 bmi 2f\n\
173 ldr %0, [%1], #2\n\
174 mov %0, %0, lsl #16\n\
175 orr %0, %0, %0, lsr #16\n\
176 str %0, [%2], #4\n\
177 subs %3, %3, #2\n\
178 bpl 1b\n\
179 2: adds %3, %3, #1\n\
180 ldreqb %0, [%1]\n\
181 streqb %0, [%2]"
182 : "=&r" (used), "=&r" (data)
183 : "r" (addr), "r" (thislen), "1" (data));
184
185 addr = ETHER1_RAM;
186
187 thislen = length;
188 if (thislen > 4096)
189 thislen = 4096;
190 page++;
191 } while (thislen);
192 }
193
194 static void
195 ether1_readbuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
196 {
197 unsigned int page, thislen, offset;
198 void __iomem *addr;
199
200 offset = start & 4095;
201 page = start >> 12;
202 addr = ETHER1_RAM + (offset << 1);
203
204 if (offset + length > 4096)
205 thislen = 4096 - offset;
206 else
207 thislen = length;
208
209 do {
210 int used;
211
212 writeb(page, REG_PAGE);
213 length -= thislen;
214
215 __asm__ __volatile__(
216 "subs %3, %3, #2\n\
217 bmi 2f\n\
218 1: ldr %0, [%2], #4\n\
219 strb %0, [%1], #1\n\
220 mov %0, %0, lsr #8\n\
221 strb %0, [%1], #1\n\
222 subs %3, %3, #2\n\
223 bmi 2f\n\
224 ldr %0, [%2], #4\n\
225 strb %0, [%1], #1\n\
226 mov %0, %0, lsr #8\n\
227 strb %0, [%1], #1\n\
228 subs %3, %3, #2\n\
229 bmi 2f\n\
230 ldr %0, [%2], #4\n\
231 strb %0, [%1], #1\n\
232 mov %0, %0, lsr #8\n\
233 strb %0, [%1], #1\n\
234 subs %3, %3, #2\n\
235 bmi 2f\n\
236 ldr %0, [%2], #4\n\
237 strb %0, [%1], #1\n\
238 mov %0, %0, lsr #8\n\
239 strb %0, [%1], #1\n\
240 subs %3, %3, #2\n\
241 bpl 1b\n\
242 2: adds %3, %3, #1\n\
243 ldreqb %0, [%2]\n\
244 streqb %0, [%1]"
245 : "=&r" (used), "=&r" (data)
246 : "r" (addr), "r" (thislen), "1" (data));
247
248 addr = ETHER1_RAM;
249
250 thislen = length;
251 if (thislen > 4096)
252 thislen = 4096;
253 page++;
254 } while (thislen);
255 }
256
257 static int __init
258 ether1_ramtest(struct net_device *dev, unsigned char byte)
259 {
260 unsigned char *buffer = kmalloc (BUFFER_SIZE, GFP_KERNEL);
261 int i, ret = BUFFER_SIZE;
262 int max_errors = 15;
263 int bad = -1;
264 int bad_start = 0;
265
266 if (!buffer)
267 return 1;
268
269 memset (buffer, byte, BUFFER_SIZE);
270 ether1_writebuffer (dev, buffer, 0, BUFFER_SIZE);
271 memset (buffer, byte ^ 0xff, BUFFER_SIZE);
272 ether1_readbuffer (dev, buffer, 0, BUFFER_SIZE);
273
274 for (i = 0; i < BUFFER_SIZE; i++) {
275 if (buffer[i] != byte) {
276 if (max_errors >= 0 && bad != buffer[i]) {
277 if (bad != -1)
278 printk ("\n");
279 printk (KERN_CRIT "%s: RAM failed with (%02X instead of %02X) at 0x%04X",
280 dev->name, buffer[i], byte, i);
281 ret = -ENODEV;
282 max_errors --;
283 bad = buffer[i];
284 bad_start = i;
285 }
286 } else {
287 if (bad != -1) {
288 if (bad_start == i - 1)
289 printk ("\n");
290 else
291 printk (" - 0x%04X\n", i - 1);
292 bad = -1;
293 }
294 }
295 }
296
297 if (bad != -1)
298 printk (" - 0x%04X\n", BUFFER_SIZE);
299 kfree (buffer);
300
301 return ret;
302 }
303
304 static int
305 ether1_reset (struct net_device *dev)
306 {
307 writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);
308 return BUS_16;
309 }
310
311 static int __init
312 ether1_init_2(struct net_device *dev)
313 {
314 int i;
315 dev->mem_start = 0;
316
317 i = ether1_ramtest (dev, 0x5a);
318
319 if (i > 0)
320 i = ether1_ramtest (dev, 0x1e);
321
322 if (i <= 0)
323 return -ENODEV;
324
325 dev->mem_end = i;
326 return 0;
327 }
328
329 /*
330 * These are the structures that are loaded into the ether RAM card to
331 * initialise the 82586
332 */
333
334 /* at 0x0100 */
335 #define NOP_ADDR (TX_AREA_START)
336 #define NOP_SIZE (0x06)
337 static nop_t init_nop = {
338 0,
339 CMD_NOP,
340 NOP_ADDR
341 };
342
343 /* at 0x003a */
344 #define TDR_ADDR (0x003a)
345 #define TDR_SIZE (0x08)
346 static tdr_t init_tdr = {
347 0,
348 CMD_TDR | CMD_INTR,
349 NOP_ADDR,
350 0
351 };
352
353 /* at 0x002e */
354 #define MC_ADDR (0x002e)
355 #define MC_SIZE (0x0c)
356 static mc_t init_mc = {
357 0,
358 CMD_SETMULTICAST,
359 TDR_ADDR,
360 0,
361 { { 0, } }
362 };
363
364 /* at 0x0022 */
365 #define SA_ADDR (0x0022)
366 #define SA_SIZE (0x0c)
367 static sa_t init_sa = {
368 0,
369 CMD_SETADDRESS,
370 MC_ADDR,
371 { 0, }
372 };
373
374 /* at 0x0010 */
375 #define CFG_ADDR (0x0010)
376 #define CFG_SIZE (0x12)
377 static cfg_t init_cfg = {
378 0,
379 CMD_CONFIG,
380 SA_ADDR,
381 8,
382 8,
383 CFG8_SRDY,
384 CFG9_PREAMB8 | CFG9_ADDRLENBUF | CFG9_ADDRLEN(6),
385 0,
386 0x60,
387 0,
388 CFG13_RETRY(15) | CFG13_SLOTH(2),
389 0,
390 };
391
392 /* at 0x0000 */
393 #define SCB_ADDR (0x0000)
394 #define SCB_SIZE (0x10)
395 static scb_t init_scb = {
396 0,
397 SCB_CMDACKRNR | SCB_CMDACKCNA | SCB_CMDACKFR | SCB_CMDACKCX,
398 CFG_ADDR,
399 RX_AREA_START,
400 0,
401 0,
402 0,
403 0
404 };
405
406 /* at 0xffee */
407 #define ISCP_ADDR (0xffee)
408 #define ISCP_SIZE (0x08)
409 static iscp_t init_iscp = {
410 1,
411 SCB_ADDR,
412 0x0000,
413 0x0000
414 };
415
416 /* at 0xfff6 */
417 #define SCP_ADDR (0xfff6)
418 #define SCP_SIZE (0x0a)
419 static scp_t init_scp = {
420 SCP_SY_16BBUS,
421 { 0, 0 },
422 ISCP_ADDR,
423 0
424 };
425
426 #define RFD_SIZE (0x16)
427 static rfd_t init_rfd = {
428 0,
429 0,
430 0,
431 0,
432 { 0, },
433 { 0, },
434 0
435 };
436
437 #define RBD_SIZE (0x0a)
438 static rbd_t init_rbd = {
439 0,
440 0,
441 0,
442 0,
443 ETH_FRAME_LEN + 8
444 };
445
446 #define TX_SIZE (0x08)
447 #define TBD_SIZE (0x08)
448
449 static int
450 ether1_init_for_open (struct net_device *dev)
451 {
452 int i, status, addr, next, next2;
453 int failures = 0;
454 unsigned long timeout;
455
456 writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);
457
458 for (i = 0; i < 6; i++)
459 init_sa.sa_addr[i] = dev->dev_addr[i];
460
461 /* load data structures into ether1 RAM */
462 ether1_writebuffer (dev, &init_scp, SCP_ADDR, SCP_SIZE);
463 ether1_writebuffer (dev, &init_iscp, ISCP_ADDR, ISCP_SIZE);
464 ether1_writebuffer (dev, &init_scb, SCB_ADDR, SCB_SIZE);
465 ether1_writebuffer (dev, &init_cfg, CFG_ADDR, CFG_SIZE);
466 ether1_writebuffer (dev, &init_sa, SA_ADDR, SA_SIZE);
467 ether1_writebuffer (dev, &init_mc, MC_ADDR, MC_SIZE);
468 ether1_writebuffer (dev, &init_tdr, TDR_ADDR, TDR_SIZE);
469 ether1_writebuffer (dev, &init_nop, NOP_ADDR, NOP_SIZE);
470
471 if (ether1_readw(dev, CFG_ADDR, cfg_t, cfg_command, NORMALIRQS) != CMD_CONFIG) {
472 printk (KERN_ERR "%s: detected either RAM fault or compiler bug\n",
473 dev->name);
474 return 1;
475 }
476
477 /*
478 * setup circularly linked list of { rfd, rbd, buffer }, with
479 * all rfds circularly linked, rbds circularly linked.
480 * First rfd is linked to scp, first rbd is linked to first
481 * rfd. Last rbd has a suspend command.
482 */
483 addr = RX_AREA_START;
484 do {
485 next = addr + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;
486 next2 = next + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;
487
488 if (next2 >= RX_AREA_END) {
489 next = RX_AREA_START;
490 init_rfd.rfd_command = RFD_CMDEL | RFD_CMDSUSPEND;
491 priv(dev)->rx_tail = addr;
492 } else
493 init_rfd.rfd_command = 0;
494 if (addr == RX_AREA_START)
495 init_rfd.rfd_rbdoffset = addr + RFD_SIZE;
496 else
497 init_rfd.rfd_rbdoffset = 0;
498 init_rfd.rfd_link = next;
499 init_rbd.rbd_link = next + RFD_SIZE;
500 init_rbd.rbd_bufl = addr + RFD_SIZE + RBD_SIZE;
501
502 ether1_writebuffer (dev, &init_rfd, addr, RFD_SIZE);
503 ether1_writebuffer (dev, &init_rbd, addr + RFD_SIZE, RBD_SIZE);
504 addr = next;
505 } while (next2 < RX_AREA_END);
506
507 priv(dev)->tx_link = NOP_ADDR;
508 priv(dev)->tx_head = NOP_ADDR + NOP_SIZE;
509 priv(dev)->tx_tail = TDR_ADDR;
510 priv(dev)->rx_head = RX_AREA_START;
511
512 /* release reset & give 586 a prod */
513 priv(dev)->resetting = 1;
514 priv(dev)->initialising = 1;
515 writeb(CTRL_RST, REG_CONTROL);
516 writeb(0, REG_CONTROL);
517 writeb(CTRL_CA, REG_CONTROL);
518
519 /* 586 should now unset iscp.busy */
520 timeout = jiffies + HZ/2;
521 while (ether1_readw(dev, ISCP_ADDR, iscp_t, iscp_busy, DISABLEIRQS) == 1) {
522 if (time_after(jiffies, timeout)) {
523 printk (KERN_WARNING "%s: can't initialise 82586: iscp is busy\n", dev->name);
524 return 1;
525 }
526 }
527
528 /* check status of commands that we issued */
529 timeout += HZ/10;
530 while (((status = ether1_readw(dev, CFG_ADDR, cfg_t, cfg_status, DISABLEIRQS))
531 & STAT_COMPLETE) == 0) {
532 if (time_after(jiffies, timeout))
533 break;
534 }
535
536 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
537 printk (KERN_WARNING "%s: can't initialise 82586: config status %04X\n", dev->name, status);
538 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
539 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
540 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
541 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
542 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
543 failures += 1;
544 }
545
546 timeout += HZ/10;
547 while (((status = ether1_readw(dev, SA_ADDR, sa_t, sa_status, DISABLEIRQS))
548 & STAT_COMPLETE) == 0) {
549 if (time_after(jiffies, timeout))
550 break;
551 }
552
553 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
554 printk (KERN_WARNING "%s: can't initialise 82586: set address status %04X\n", dev->name, status);
555 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
556 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
557 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
558 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
559 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
560 failures += 1;
561 }
562
563 timeout += HZ/10;
564 while (((status = ether1_readw(dev, MC_ADDR, mc_t, mc_status, DISABLEIRQS))
565 & STAT_COMPLETE) == 0) {
566 if (time_after(jiffies, timeout))
567 break;
568 }
569
570 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
571 printk (KERN_WARNING "%s: can't initialise 82586: set multicast status %04X\n", dev->name, status);
572 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
573 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
574 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
575 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
576 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
577 failures += 1;
578 }
579
580 timeout += HZ;
581 while (((status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_status, DISABLEIRQS))
582 & STAT_COMPLETE) == 0) {
583 if (time_after(jiffies, timeout))
584 break;
585 }
586
587 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
588 printk (KERN_WARNING "%s: can't tdr (ignored)\n", dev->name);
589 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
590 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
591 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
592 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
593 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
594 } else {
595 status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_result, DISABLEIRQS);
596 if (status & TDR_XCVRPROB)
597 printk (KERN_WARNING "%s: i/f failed tdr: transceiver problem\n", dev->name);
598 else if ((status & (TDR_SHORT|TDR_OPEN)) && (status & TDR_TIME)) {
599 #ifdef FANCY
600 printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d.%d us away\n", dev->name,
601 status & TDR_SHORT ? "short" : "open", (status & TDR_TIME) / 10,
602 (status & TDR_TIME) % 10);
603 #else
604 printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d clks away\n", dev->name,
605 status & TDR_SHORT ? "short" : "open", (status & TDR_TIME));
606 #endif
607 }
608 }
609
610 if (failures)
611 ether1_reset (dev);
612 return failures ? 1 : 0;
613 }
614
615 /* ------------------------------------------------------------------------- */
616
617 static int
618 ether1_txalloc (struct net_device *dev, int size)
619 {
620 int start, tail;
621
622 size = (size + 1) & ~1;
623 tail = priv(dev)->tx_tail;
624
625 if (priv(dev)->tx_head + size > TX_AREA_END) {
626 if (tail > priv(dev)->tx_head)
627 return -1;
628 start = TX_AREA_START;
629 if (start + size > tail)
630 return -1;
631 priv(dev)->tx_head = start + size;
632 } else {
633 if (priv(dev)->tx_head < tail && (priv(dev)->tx_head + size) > tail)
634 return -1;
635 start = priv(dev)->tx_head;
636 priv(dev)->tx_head += size;
637 }
638
639 return start;
640 }
641
642 static int
643 ether1_open (struct net_device *dev)
644 {
645 if (!is_valid_ether_addr(dev->dev_addr)) {
646 printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
647 dev->name);
648 return -EINVAL;
649 }
650
651 if (request_irq(dev->irq, ether1_interrupt, 0, "ether1", dev))
652 return -EAGAIN;
653
654 memset (&priv(dev)->stats, 0, sizeof (struct net_device_stats));
655
656 if (ether1_init_for_open (dev)) {
657 free_irq (dev->irq, dev);
658 return -EAGAIN;
659 }
660
661 netif_start_queue(dev);
662
663 return 0;
664 }
665
666 static void
667 ether1_timeout(struct net_device *dev)
668 {
669 printk(KERN_WARNING "%s: transmit timeout, network cable problem?\n",
670 dev->name);
671 printk(KERN_WARNING "%s: resetting device\n", dev->name);
672
673 ether1_reset (dev);
674
675 if (ether1_init_for_open (dev))
676 printk (KERN_ERR "%s: unable to restart interface\n", dev->name);
677
678 priv(dev)->stats.tx_errors++;
679 netif_wake_queue(dev);
680 }
681
682 static int
683 ether1_sendpacket (struct sk_buff *skb, struct net_device *dev)
684 {
685 int tmp, tst, nopaddr, txaddr, tbdaddr, dataddr;
686 unsigned long flags;
687 tx_t tx;
688 tbd_t tbd;
689 nop_t nop;
690
691 if (priv(dev)->restart) {
692 printk(KERN_WARNING "%s: resetting device\n", dev->name);
693
694 ether1_reset(dev);
695
696 if (ether1_init_for_open(dev))
697 printk(KERN_ERR "%s: unable to restart interface\n", dev->name);
698 else
699 priv(dev)->restart = 0;
700 }
701
702 if (skb->len < ETH_ZLEN) {
703 skb = skb_padto(skb, ETH_ZLEN);
704 if (skb == NULL)
705 goto out;
706 }
707
708 /*
709 * insert packet followed by a nop
710 */
711 txaddr = ether1_txalloc (dev, TX_SIZE);
712 tbdaddr = ether1_txalloc (dev, TBD_SIZE);
713 dataddr = ether1_txalloc (dev, skb->len);
714 nopaddr = ether1_txalloc (dev, NOP_SIZE);
715
716 tx.tx_status = 0;
717 tx.tx_command = CMD_TX | CMD_INTR;
718 tx.tx_link = nopaddr;
719 tx.tx_tbdoffset = tbdaddr;
720 tbd.tbd_opts = TBD_EOL | skb->len;
721 tbd.tbd_link = I82586_NULL;
722 tbd.tbd_bufl = dataddr;
723 tbd.tbd_bufh = 0;
724 nop.nop_status = 0;
725 nop.nop_command = CMD_NOP;
726 nop.nop_link = nopaddr;
727
728 local_irq_save(flags);
729 ether1_writebuffer (dev, &tx, txaddr, TX_SIZE);
730 ether1_writebuffer (dev, &tbd, tbdaddr, TBD_SIZE);
731 ether1_writebuffer (dev, skb->data, dataddr, skb->len);
732 ether1_writebuffer (dev, &nop, nopaddr, NOP_SIZE);
733 tmp = priv(dev)->tx_link;
734 priv(dev)->tx_link = nopaddr;
735
736 /* now reset the previous nop pointer */
737 ether1_writew(dev, txaddr, tmp, nop_t, nop_link, NORMALIRQS);
738
739 local_irq_restore(flags);
740
741 /* handle transmit */
742 dev->trans_start = jiffies;
743
744 /* check to see if we have room for a full sized ether frame */
745 tmp = priv(dev)->tx_head;
746 tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
747 priv(dev)->tx_head = tmp;
748 dev_kfree_skb (skb);
749
750 if (tst == -1)
751 netif_stop_queue(dev);
752
753 out:
754 return 0;
755 }
756
757 static void
758 ether1_xmit_done (struct net_device *dev)
759 {
760 nop_t nop;
761 int caddr, tst;
762
763 caddr = priv(dev)->tx_tail;
764
765 again:
766 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
767
768 switch (nop.nop_command & CMD_MASK) {
769 case CMD_TDR:
770 /* special case */
771 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
772 != (unsigned short)I82586_NULL) {
773 ether1_writew(dev, SCB_CMDCUCSTART | SCB_CMDRXSTART, SCB_ADDR, scb_t,
774 scb_command, NORMALIRQS);
775 writeb(CTRL_CA, REG_CONTROL);
776 }
777 priv(dev)->tx_tail = NOP_ADDR;
778 return;
779
780 case CMD_NOP:
781 if (nop.nop_link == caddr) {
782 if (priv(dev)->initialising == 0)
783 printk (KERN_WARNING "%s: strange command complete with no tx command!\n", dev->name);
784 else
785 priv(dev)->initialising = 0;
786 return;
787 }
788 if (caddr == nop.nop_link)
789 return;
790 caddr = nop.nop_link;
791 goto again;
792
793 case CMD_TX:
794 if (nop.nop_status & STAT_COMPLETE)
795 break;
796 printk (KERN_ERR "%s: strange command complete without completed command\n", dev->name);
797 priv(dev)->restart = 1;
798 return;
799
800 default:
801 printk (KERN_WARNING "%s: strange command %d complete! (offset %04X)", dev->name,
802 nop.nop_command & CMD_MASK, caddr);
803 priv(dev)->restart = 1;
804 return;
805 }
806
807 while (nop.nop_status & STAT_COMPLETE) {
808 if (nop.nop_status & STAT_OK) {
809 priv(dev)->stats.tx_packets ++;
810 priv(dev)->stats.collisions += (nop.nop_status & STAT_COLLISIONS);
811 } else {
812 priv(dev)->stats.tx_errors ++;
813
814 if (nop.nop_status & STAT_COLLAFTERTX)
815 priv(dev)->stats.collisions ++;
816 if (nop.nop_status & STAT_NOCARRIER)
817 priv(dev)->stats.tx_carrier_errors ++;
818 if (nop.nop_status & STAT_TXLOSTCTS)
819 printk (KERN_WARNING "%s: cts lost\n", dev->name);
820 if (nop.nop_status & STAT_TXSLOWDMA)
821 priv(dev)->stats.tx_fifo_errors ++;
822 if (nop.nop_status & STAT_COLLEXCESSIVE)
823 priv(dev)->stats.collisions += 16;
824 }
825
826 if (nop.nop_link == caddr) {
827 printk (KERN_ERR "%s: tx buffer chaining error: tx command points to itself\n", dev->name);
828 break;
829 }
830
831 caddr = nop.nop_link;
832 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
833 if ((nop.nop_command & CMD_MASK) != CMD_NOP) {
834 printk (KERN_ERR "%s: tx buffer chaining error: no nop after tx command\n", dev->name);
835 break;
836 }
837
838 if (caddr == nop.nop_link)
839 break;
840
841 caddr = nop.nop_link;
842 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
843 if ((nop.nop_command & CMD_MASK) != CMD_TX) {
844 printk (KERN_ERR "%s: tx buffer chaining error: no tx command after nop\n", dev->name);
845 break;
846 }
847 }
848 priv(dev)->tx_tail = caddr;
849
850 caddr = priv(dev)->tx_head;
851 tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
852 priv(dev)->tx_head = caddr;
853 if (tst != -1)
854 netif_wake_queue(dev);
855 }
856
857 static void
858 ether1_recv_done (struct net_device *dev)
859 {
860 int status;
861 int nexttail, rbdaddr;
862 rbd_t rbd;
863
864 do {
865 status = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_status, NORMALIRQS);
866 if ((status & RFD_COMPLETE) == 0)
867 break;
868
869 rbdaddr = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_rbdoffset, NORMALIRQS);
870 ether1_readbuffer (dev, &rbd, rbdaddr, RBD_SIZE);
871
872 if ((rbd.rbd_status & (RBD_EOF | RBD_ACNTVALID)) == (RBD_EOF | RBD_ACNTVALID)) {
873 int length = rbd.rbd_status & RBD_ACNT;
874 struct sk_buff *skb;
875
876 length = (length + 1) & ~1;
877 skb = dev_alloc_skb (length + 2);
878
879 if (skb) {
880 skb->dev = dev;
881 skb_reserve (skb, 2);
882
883 ether1_readbuffer (dev, skb_put (skb, length), rbd.rbd_bufl, length);
884
885 skb->protocol = eth_type_trans (skb, dev);
886 netif_rx (skb);
887 priv(dev)->stats.rx_packets ++;
888 } else
889 priv(dev)->stats.rx_dropped ++;
890 } else {
891 printk(KERN_WARNING "%s: %s\n", dev->name,
892 (rbd.rbd_status & RBD_EOF) ? "oversized packet" : "acnt not valid");
893 priv(dev)->stats.rx_dropped ++;
894 }
895
896 nexttail = ether1_readw(dev, priv(dev)->rx_tail, rfd_t, rfd_link, NORMALIRQS);
897 /* nexttail should be rx_head */
898 if (nexttail != priv(dev)->rx_head)
899 printk(KERN_ERR "%s: receiver buffer chaining error (%04X != %04X)\n",
900 dev->name, nexttail, priv(dev)->rx_head);
901 ether1_writew(dev, RFD_CMDEL | RFD_CMDSUSPEND, nexttail, rfd_t, rfd_command, NORMALIRQS);
902 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_command, NORMALIRQS);
903 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_status, NORMALIRQS);
904 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_rbdoffset, NORMALIRQS);
905
906 priv(dev)->rx_tail = nexttail;
907 priv(dev)->rx_head = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_link, NORMALIRQS);
908 } while (1);
909 }
910
911 static irqreturn_t
912 ether1_interrupt (int irq, void *dev_id, struct pt_regs *regs)
913 {
914 struct net_device *dev = (struct net_device *)dev_id;
915 int status;
916
917 status = ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS);
918
919 if (status) {
920 ether1_writew(dev, status & (SCB_STRNR | SCB_STCNA | SCB_STFR | SCB_STCX),
921 SCB_ADDR, scb_t, scb_command, NORMALIRQS);
922 writeb(CTRL_CA | CTRL_ACK, REG_CONTROL);
923 if (status & SCB_STCX) {
924 ether1_xmit_done (dev);
925 }
926 if (status & SCB_STCNA) {
927 if (priv(dev)->resetting == 0)
928 printk (KERN_WARNING "%s: CU went not ready ???\n", dev->name);
929 else
930 priv(dev)->resetting += 1;
931 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
932 != (unsigned short)I82586_NULL) {
933 ether1_writew(dev, SCB_CMDCUCSTART, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
934 writeb(CTRL_CA, REG_CONTROL);
935 }
936 if (priv(dev)->resetting == 2)
937 priv(dev)->resetting = 0;
938 }
939 if (status & SCB_STFR) {
940 ether1_recv_done (dev);
941 }
942 if (status & SCB_STRNR) {
943 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS) & SCB_STRXSUSP) {
944 printk (KERN_WARNING "%s: RU went not ready: RU suspended\n", dev->name);
945 ether1_writew(dev, SCB_CMDRXRESUME, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
946 writeb(CTRL_CA, REG_CONTROL);
947 priv(dev)->stats.rx_dropped ++; /* we suspended due to lack of buffer space */
948 } else
949 printk(KERN_WARNING "%s: RU went not ready: %04X\n", dev->name,
950 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS));
951 printk (KERN_WARNING "RU ptr = %04X\n", ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset,
952 NORMALIRQS));
953 }
954 } else
955 writeb(CTRL_ACK, REG_CONTROL);
956
957 return IRQ_HANDLED;
958 }
959
960 static int
961 ether1_close (struct net_device *dev)
962 {
963 ether1_reset (dev);
964
965 free_irq(dev->irq, dev);
966
967 return 0;
968 }
969
970 static struct net_device_stats *
971 ether1_getstats (struct net_device *dev)
972 {
973 return &priv(dev)->stats;
974 }
975
976 /*
977 * Set or clear the multicast filter for this adaptor.
978 * num_addrs == -1 Promiscuous mode, receive all packets.
979 * num_addrs == 0 Normal mode, clear multicast list.
980 * num_addrs > 0 Multicast mode, receive normal and MC packets, and do
981 * best-effort filtering.
982 */
983 static void
984 ether1_setmulticastlist (struct net_device *dev)
985 {
986 }
987
988 /* ------------------------------------------------------------------------- */
989
990 static void __init ether1_banner(void)
991 {
992 static unsigned int version_printed = 0;
993
994 if (net_debug && version_printed++ == 0)
995 printk(KERN_INFO "%s", version);
996 }
997
998 static int __devinit
999 ether1_probe(struct expansion_card *ec, const struct ecard_id *id)
1000 {
1001 struct net_device *dev;
1002 int i, ret = 0;
1003
1004 ether1_banner();
1005
1006 ret = ecard_request_resources(ec);
1007 if (ret)
1008 goto out;
1009
1010 dev = alloc_etherdev(sizeof(struct ether1_priv));
1011 if (!dev) {
1012 ret = -ENOMEM;
1013 goto release;
1014 }
1015
1016 SET_MODULE_OWNER(dev);
1017 SET_NETDEV_DEV(dev, &ec->dev);
1018
1019 dev->irq = ec->irq;
1020 priv(dev)->base = ioremap(ecard_resource_start(ec, ECARD_RES_IOCFAST),
1021 ecard_resource_len(ec, ECARD_RES_IOCFAST));
1022 if (!priv(dev)->base) {
1023 ret = -ENOMEM;
1024 goto free;
1025 }
1026
1027 if ((priv(dev)->bus_type = ether1_reset(dev)) == 0) {
1028 ret = -ENODEV;
1029 goto free;
1030 }
1031
1032 for (i = 0; i < 6; i++)
1033 dev->dev_addr[i] = readb(IDPROM_ADDRESS + (i << 2));
1034
1035 if (ether1_init_2(dev)) {
1036 ret = -ENODEV;
1037 goto free;
1038 }
1039
1040 dev->open = ether1_open;
1041 dev->stop = ether1_close;
1042 dev->hard_start_xmit = ether1_sendpacket;
1043 dev->get_stats = ether1_getstats;
1044 dev->set_multicast_list = ether1_setmulticastlist;
1045 dev->tx_timeout = ether1_timeout;
1046 dev->watchdog_timeo = 5 * HZ / 100;
1047
1048 ret = register_netdev(dev);
1049 if (ret)
1050 goto free;
1051
1052 printk(KERN_INFO "%s: ether1 in slot %d, ",
1053 dev->name, ec->slot_no);
1054
1055 for (i = 0; i < 6; i++)
1056 printk ("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
1057
1058 ecard_set_drvdata(ec, dev);
1059 return 0;
1060
1061 free:
1062 if (priv(dev)->base)
1063 iounmap(priv(dev)->base);
1064 free_netdev(dev);
1065 release:
1066 ecard_release_resources(ec);
1067 out:
1068 return ret;
1069 }
1070
1071 static void __devexit ether1_remove(struct expansion_card *ec)
1072 {
1073 struct net_device *dev = ecard_get_drvdata(ec);
1074
1075 ecard_set_drvdata(ec, NULL);
1076
1077 unregister_netdev(dev);
1078 iounmap(priv(dev)->base);
1079 free_netdev(dev);
1080 ecard_release_resources(ec);
1081 }
1082
1083 static const struct ecard_id ether1_ids[] = {
1084 { MANU_ACORN, PROD_ACORN_ETHER1 },
1085 { 0xffff, 0xffff }
1086 };
1087
1088 static struct ecard_driver ether1_driver = {
1089 .probe = ether1_probe,
1090 .remove = __devexit_p(ether1_remove),
1091 .id_table = ether1_ids,
1092 .drv = {
1093 .name = "ether1",
1094 },
1095 };
1096
1097 static int __init ether1_init(void)
1098 {
1099 return ecard_register_driver(&ether1_driver);
1100 }
1101
1102 static void __exit ether1_exit(void)
1103 {
1104 ecard_remove_driver(&ether1_driver);
1105 }
1106
1107 module_init(ether1_init);
1108 module_exit(ether1_exit);
1109
1110 MODULE_LICENSE("GPL");
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